CN109037810A

CN109037810A - A kind of charging method of battery, device and battery system

Info

Publication number: CN109037810A
Application number: CN201710428885.9A
Authority: CN
Inventors: 范会平; 明帮生; 沈海杰; 陈宏浩; 汪颖
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2017-06-08
Filing date: 2017-06-08
Publication date: 2018-12-18

Abstract

The embodiment of the invention provides a kind of charging method of battery, device and battery systems.The status information that the embodiment of the present invention passes through acquisition battery, then, according to the status information of battery, judge whether the condition for meeting the charge power for reducing battery, when the condition for judging to meet the charge power for reducing battery, the charge power of battery is reduced, in turn, is charged the battery with the charge power after reducing.Therefore, the embodiment of the present invention slows down loss rate of battery during cycle charging to a certain extent, extends the cycle life of battery.

Description

Battery charging method and device and battery system

[ technical field ] A method for producing a semiconductor device

The present invention relates to the field of battery technologies, and in particular, to a battery charging method and apparatus, and a battery system.

[ background of the invention ]

With the progress of battery technology, more and more electric products adopt high-power charging technology to charge batteries. In the whole cycle life process of the rechargeable battery, the internal resistance of the battery is increased along with the extension of the cycle service time of the battery, so that the polarization of the battery is increased in the later high-rate charging process of the battery. In the past, for the anode, when the polarization is large to a certain degree, the potential of the negative electrode of the battery is reduced to be below 0V, and when the potential of the negative electrode of the battery is reduced to be below 0V, lithium ions can be partially inserted into the layered structure of the anode in the charging process of the battery, and a part of lithium ions can be separated out on the surface of the anode, so that the cycle life of the battery is influenced; for the cathode, when the polarization is larger and the battery is charged to the upper limit voltage of the battery, the higher the potential of the cathode is, the accelerated damage of the crystal form of the cathode material can be caused, and the rapid oxidative decomposition of the electrolyte can be caused, so that the capacity/energy attenuation is accelerated, and the higher the potential of the cathode in the charging process is, the faster the damage to the crystal form structure of the cathode and the oxidation effect of the electrolyte are.

Therefore, in the existing high-power charging technology, as the recycling time of the battery increases, the polarization of the battery becomes large, and a large amount of byproducts are accumulated on the cathode and the anode of the battery, so that the damage to the crystal form of the cathode material is accelerated, and the rapid oxidative decomposition of the electrolyte is caused, so that the rapid attenuation of the energy and the capacity of the battery is accelerated, and the service life of the battery is influenced.

[ summary of the invention ]

Embodiments of the present invention provide a method, an apparatus, and a battery system for charging a battery, which slow down the battery consumption rate during the cyclic charging process to a certain extent and prolong the cycle life of the battery.

In one aspect, an embodiment of the present invention provides a method for charging a battery, including:

acquiring state information of a battery;

judging whether the condition of reducing the charging power of the battery is met or not according to the state information of the battery;

when the condition of reducing the charging power of the battery is judged to be met, reducing the charging power of the battery;

charging the battery with the reduced charging power;

wherein the state information of the battery includes at least one of a cycle number of the battery, an accumulated time of the battery, capacity state information of the battery, and energy state information of the battery.

The above aspect and any possible implementation further provide an implementation in which the number of cycles of the battery includes at least one of a total number of cycles of the battery and a cycle number interval of the battery.

The above-described aspect and any possible implementation further provide an implementation in which the accumulated time of the battery includes at least one of a total accumulated time of the battery and an accumulated time interval of the battery.

The above-described aspect and any possible implementation manner further provide an implementation manner, wherein the capacity state information of the battery includes at least one of a current capacity of the battery and a capacity retention rate of the battery.

The above-described aspect and any possible implementation manner further provide an implementation manner, wherein the energy state information of the battery includes at least one of a current energy of the battery and an energy conservation rate of the battery.

The foregoing aspect and any possible implementation manner further provide an implementation manner, where determining whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery, the implementation manner further includes:

comparing the number of cycles of the battery to a corresponding number threshold;

when the cycle number of the battery is the corresponding number threshold, judging that the condition of reducing the charging power of the battery is satisfied; or, when the cycle number of the battery is not the corresponding number threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

comparing the accumulated time of the battery with a corresponding time threshold;

when the accumulated time of the battery is the corresponding time threshold, judging that the condition of reducing the charging power of the battery is satisfied; or, when the accumulated time of the battery is not the corresponding time threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

The foregoing aspect and any possible implementation manner further provide an implementation manner, where determining whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery, including:

comparing the capacity state information of the battery with a corresponding capacity threshold;

when the capacity state information of the battery reaches the corresponding capacity threshold value, judging that the condition of reducing the charging power of the battery is satisfied; or, when the capacity state information of the battery is not the corresponding capacity threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

comparing the energy state information of the battery with a corresponding energy threshold;

when the energy state information of the battery is the corresponding energy threshold value, judging that the condition of reducing the charging power of the battery is satisfied; or, when the energy state information of the battery is not the corresponding energy threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

The above aspect and any possible implementation manner further provide an implementation manner that reduces the charging power of the battery, including:

reducing the charging power of the battery according to a preset charging power adjustment interval; or,

taking one candidate charging power lower than the charging power of the battery in a preset charging power candidate set as the reduced charging power; wherein the set of charging power candidates comprises at least one candidate charging power.

As for the above-mentioned aspect and any possible implementation manner, further providing an implementation manner, if the state information of the battery is the cycle number, acquiring the state information of the battery includes:

acquiring the number of times that the battery is subjected to a charging process and a discharging process as the cycle number of the battery; or,

acquiring the number of times that the maximum voltage of the battery reaches a charging upper limit voltage and the minimum voltage of the battery reaches a discharging lower limit voltage as the number of cycles of the battery; or,

and acquiring the number of the residual capacity corresponding to the maximum residual capacity of the battery reaching the charging upper limit voltage and the minimum residual capacity of the battery reaching the discharging lower limit voltage as the cycle number of the battery.

The above aspect and any possible implementation further provide an implementation that charges the battery with a reduced charging power, including:

and charging the battery by adopting a constant power charging mode with the reduced charging power.

The above aspect and any possible implementation further provides an implementation, before comparing the number of cycles of the battery to a corresponding number threshold, the method further comprising:

determining a temperature section corresponding to the current temperature of the battery according to the current temperature of the battery;

determining that a number threshold corresponding to the temperature segment is a number threshold of the battery.

The above-described aspect and any possible implementation further provides an implementation, before comparing the accumulated time of the battery with a corresponding time threshold, the method further includes:

and determining the time threshold corresponding to the temperature section as the time threshold of the battery.

The above-described aspect and any possible implementation further provides an implementation, before comparing the capacity status information of the battery with the corresponding capacity threshold, the method further includes:

determining a capacity threshold corresponding to the temperature segment as a capacity threshold of the battery.

The above-described aspect and any possible implementation further provides an implementation, before comparing the energy state information of the battery with the corresponding energy threshold, the method further includes:

determining an energy threshold corresponding to the temperature segment as an energy threshold of the battery.

In another aspect, an embodiment of the present invention provides a charging apparatus for a battery, including:

an acquisition unit configured to acquire state information of a battery;

the judging unit is used for judging whether the condition of reducing the charging power of the battery is met or not according to the state information of the battery;

the adjusting unit is used for reducing the charging power of the battery when judging that the condition for reducing the charging power of the battery is met;

a charging unit for charging the battery with the reduced charging power;

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the determining unit is specifically configured to:

when the accumulated time of the battery is the corresponding time threshold, judging that the condition of reducing the charging power of the battery is satisfied; or, if the accumulated time of the battery is not the corresponding time threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

when the capacity state information of the battery is the corresponding capacity threshold value, judging that the condition of reducing the charging power of the battery is satisfied; or, when the capacity state information of the battery is not the corresponding capacity threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the adjusting unit is specifically configured to:

As to the above-mentioned aspect and any possible implementation manner, there is further provided an implementation manner, where if the state information of the battery is the cycle number, the obtaining unit is specifically configured to:

The above aspect and any possible implementation manner further provide an implementation manner, where the charging unit is specifically configured to:

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the determining unit is further configured to:

In another aspect, an embodiment of the present invention provides a battery system, including: a battery and a charging device for a battery according to any of the above embodiments.

One of the above technical solutions has the following beneficial effects:

in the embodiment of the invention, the state information of the battery is acquired, the state information of the battery comprises at least one of the cycle number of the battery and the accumulated time of the battery, then, whether the condition for reducing the charging power of the battery is met or not is judged according to the state information of the battery, if the condition for reducing the charging power of the battery is judged to be met, the charging power of the battery is reduced, and further, the battery is charged by the reduced charging power. According to the charging method provided by the embodiment of the invention, the influence of the storage process of the battery on the performance deterioration of the battery and the influence of the recycling process of the battery on the performance deterioration of the battery are comprehensively considered, the use data which can represent the use condition of the battery is obtained by acquiring the cycle number, the accumulated time and the like of the battery, whether the preset conditions are met is judged according to the use data, and whether the operation of reducing the charging power of the battery is carried out is further determined; when the preset condition is met, the charging power of the battery is properly adjusted, and the battery is charged with the reduced charging power, so that the voltage of the battery is gradually increased in the process of charging the battery, the current of the battery is gradually reduced due to the reduction of the charging power, and the polarization speed of the battery is slowed; therefore, the speed of accumulating byproducts on the anode and the cathode of the battery is slowed down, the damage speed of the crystal form of the cathode material of the battery is slowed down, the oxidation decomposition speed of the electrolyte is slowed down, and the cycle performance of the battery is improved; furthermore, the loss speed of the battery in the cyclic charging process is slowed to a certain extent, and the cycle life of the battery is prolonged.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic flowchart illustrating a first embodiment of a method for charging a battery according to the present invention;

FIG. 2 is a diagram illustrating a relationship between a voltage and a remaining power of a battery according to an embodiment of the present invention;

fig. 3 is a schematic flowchart of a second embodiment of a battery charging method according to the present invention;

fig. 4 is a schematic flowchart of a third embodiment of a battery charging method according to the present invention;

fig. 5 is a schematic flowchart illustrating a fourth embodiment of a battery charging method according to an embodiment of the present invention;

fig. 6 is a schematic flowchart of a fifth embodiment of a battery charging method according to an embodiment of the present invention;

fig. 7 is a schematic flowchart of a sixth embodiment of a battery charging method according to an embodiment of the present invention;

fig. 8 is a schematic flowchart of a seventh embodiment of a battery charging method according to an embodiment of the present invention;

fig. 9 is a functional block diagram of a battery charging apparatus according to an embodiment of the present invention;

fig. 10 is a functional block diagram of a battery system according to an embodiment of the present invention;

fig. 11 is a first schematic diagram of a battery system according to an embodiment of the invention;

fig. 12 is a second schematic diagram of a battery system according to an embodiment of the invention;

fig. 13 is a third schematic view of a battery system according to an embodiment of the invention;

fig. 14 is a fourth schematic diagram of a battery system according to an embodiment of the invention.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

Example one

Fig. 1 is a schematic flow chart of a first embodiment of a method for charging a battery according to an embodiment of the present invention. As shown in fig. 1, the method includes:

s101, acquiring the state information of the battery.

Specifically, in this embodiment of the present invention, the state information of the battery may include, but is not limited to, at least one of a cycle number of the battery, an accumulated time of the battery, capacity state information of the battery, and energy state information of the battery. Besides, the state information of the battery may also include data related to the temperature of the battery.

Specifically, in the embodiment of the present invention, the cycle number of the battery may include, but is not limited to, at least one of total cycle data of the battery and a cycle number interval of the battery, and this is not particularly limited in the embodiment of the present invention.

Specifically, in the embodiment of the present invention, the accumulated time of the battery may include, but is not limited to, at least one of a total accumulated time of the battery and an accumulated time interval of the battery, and this is not particularly limited in the embodiment of the present invention.

Specifically, in the embodiment of the present invention, the capacity state information of the battery may include, but is not limited to, at least one of a current capacity of the battery and a capacity retention rate of the battery, which is not particularly limited in the embodiment of the present invention. In addition, the capacity state information of the battery may further include a capacity interval of the battery and a capacity retention rate interval of the battery, which is not particularly limited in the embodiment of the present invention.

Specifically, in the embodiment of the present invention, the energy state information of the battery may include, but is not limited to, at least one of a current energy of the battery and an energy retention rate of the battery, which is not particularly limited in the embodiment of the present invention. In addition, the energy state information of the battery may further include an energy interval of the battery and an energy retention rate interval of the battery, which is not particularly limited in the embodiment of the present invention.

And S102, judging whether the condition of reducing the charging power of the battery is met or not according to the state information of the battery.

It can be understood that, in the embodiment of the present invention, different determination conditions may be adopted for determination according to different acquired state information of the battery.

And S103, reducing the charging power of the battery when the condition of reducing the charging power of the battery is judged to be satisfied.

And S104, charging the battery with the reduced charging power.

In the embodiment of the present invention, if the charging power of the battery is reduced, the battery is charged with the reduced charging power in the cyclic charging process of the battery, and the battery is charged to the charging cutoff voltage with the reduced charging power.

Specifically, the embodiment of the present invention does not particularly limit the specific charging method for charging and discharging the battery with the reduced charging power.

Specifically, the charging power after the reduction can be used for charging the battery by adopting a constant power charging mode.

In a specific implementation process, the constant power charging mode may include, but is not limited to: constant power pulse charging, constant power step charging, constant power constant voltage charging, and single constant power charging. Therefore, in the process of actually realizing the scheme, the battery can be charged by adopting any one of the charging modes under the constant-power charging mode; alternatively, the battery may be charged by at least two charging methods among the constant power charging methods.

In another specific implementation process, a constant current discharge mode, a constant power discharge mode, or the like may be adopted.

One of the technical solutions of the embodiments of the present invention has the following beneficial effects:

in the embodiment of the invention, the state information of the battery is acquired, the state information of the battery comprises at least one of the cycle number of the battery and the accumulated time of the battery, then, whether the condition of reducing the charging power of the battery is met or not is judged according to the state information of the battery, and when the condition of reducing the charging power of the battery is judged to be met, the charging power of the battery is reduced, and further, the battery is charged by the reduced charging power. The charging method provided by the embodiment of the invention comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, can represent the use data of the battery by acquiring the recycling number, the accumulated time and the like of the battery, judges whether the preset conditions are met according to the use data, and further determines whether the operation of reducing the charging power of the battery is carried out; when the preset condition is met, the charging power of the battery is properly adjusted, and the battery is charged with the reduced charging power, so that the voltage of the battery is gradually increased in the process of charging the battery, the current of the battery is gradually reduced due to the reduction of the charging power, and the polarization speed of the battery is slowed; therefore, the speed of accumulating byproducts on the anode and the cathode of the battery is slowed down, the damage speed of the crystal form of the cathode material of the battery is slowed down, the oxidation decomposition speed of the electrolyte is slowed down, and the cycle performance of the battery is improved; furthermore, the loss speed of the battery in the cyclic charging process is slowed to a certain extent, and the cycle life of the battery is prolonged.

Example two

Based on the method for charging a battery provided in the first embodiment of the present invention, the first embodiment of the present invention specifically describes an implementation manner of "acquiring state information of a battery" in S101.

In the embodiment of the present invention, the state information of the battery includes the number of cycles of the battery and the accumulated time of the battery, and the implementation of acquiring the number of cycles of the battery, the implementation of acquiring the accumulated time of the battery, the implementation of acquiring the capacity state information of the battery, and the implementation of acquiring the energy state information of the battery will be described in four ways.

In a first aspect, a number of cycles of a battery is obtained.

Specifically, in the embodiment of the present invention, if the state information of the battery is the cycle number of the battery, the state information of the battery is obtained, that is, the cycle number of the battery is obtained. Specifically, in the embodiment of the present invention, there may be multiple implementations of obtaining the number of cycles of the battery, and this is not particularly limited in the embodiment of the present invention.

In a specific implementation process, in the embodiment of the present invention, the number of cycles of obtaining the battery may include, but is not limited to, the following three ways:

the first method comprises the following steps: the number of times the battery is subjected to one charging process and one discharging process is obtained as the number of cycles of the battery.

It should be noted that, by acquiring the cycle number of the battery in this way, it is not necessary to consider the charge cut-off voltage, the charge upper limit voltage, the charge time, the charge power, and the like of the battery during the charge process, and it is not necessary to consider the discharge cut-off voltage, the discharge lower limit voltage, the discharge time, the discharge power, and the like of the battery during the discharge process.

In one particular implementation, a change in current and/or a change in voltage of the battery may be detected to determine the number of charging and discharging processes performed on the battery, and thus the number of cycles of the battery. It should be understood that the above-described embodiments are merely illustrative of implementations of embodiments of the present invention, and are not intended to limit the present application.

For example, for a battery with an operating voltage interval of 3.0V to 4.35V, the initial voltage of the battery is 3.8V, the battery is subjected to a charging process, the duration of the charging process is 5 minutes, the charging process is finished, and the voltage of the battery is 3.81V; then, the battery was subjected to a discharge process for 10 minutes, and the discharge process was completed to a voltage of 3.75V. At this time, the battery was subjected to a charging process and a discharging process, and therefore, the number of cycles of obtaining the battery was 1.

And the second method comprises the following steps: the number of cycles of the battery in which the maximum voltage of the battery is greater than or equal to the charging upper-limit voltage and the battery minimum voltage is less than or equal to the discharging lower-limit voltage is obtained as the number of cycles of the battery.

When the number of cycles of the battery is obtained in this way, the charging process of the battery includes: charging the battery to a charging upper limit voltage; and the discharging process of the battery comprises the following steps: the battery is discharged to a discharge lower limit voltage.

For example, for a battery with an operating voltage interval of 3.0V to 4.35V, if the initial voltage of the battery is 3.8V, the upper charging limit voltage of the battery is 4.2V, and the lower discharging limit voltage of the battery is 3.2V, it is only necessary to determine that the maximum voltage of the battery is greater than or equal to the upper charging limit voltage of the battery by 4.2V, and the minimum voltage of the battery is less than the number of the lower discharging limit voltage of the battery by 3.2V during the cycling of the battery, so as to determine the number of cycles of the battery. If the number of times that the maximum voltage of the battery is acquired to be greater than or equal to the upper charging limit voltage 4.2V of the battery and the minimum voltage of the battery is less than the lower discharging limit voltage 3.2V of the battery is 4 times during the cycling of the battery, the number of cycles of the acquired battery is 4.

It should be noted that the upper charging limit voltage of the battery is used to calculate the number of cycles of the battery, the upper charging limit voltage of the battery may be smaller than or equal to the charge cut-off voltage of the battery, and in a specific implementation process, the upper charging limit voltage of the battery may be preset according to actual needs, which is not particularly limited in the embodiment of the present invention.

It should be noted that the discharge lower limit voltage of the battery is used to calculate the number of cycles of the battery, the discharge lower limit voltage of the battery may be greater than or equal to the discharge cutoff voltage of the battery, and in a specific implementation process, the discharge lower limit voltage of the battery may be preset according to actual needs, which is not particularly limited in the embodiment of the present invention.

In a specific implementation process, during the discharging process of the battery in the cycle process, the discharge cut-off voltage of the battery can be in a range of 1.0V to 3.8V, and the discharge lower limit voltage of the battery can be preset in a range higher than the discharge cut-off voltage of the battery.

And the third is that: and acquiring the number of the residual capacities, wherein the maximum residual capacity of the battery is greater than or equal to the residual capacity corresponding to the charging upper limit voltage, and the minimum residual capacity of the battery is less than or equal to the residual capacity corresponding to the discharging lower limit voltage, as the cycle number of the battery.

Please refer to fig. 2, which is a diagram illustrating a relationship between a voltage and a remaining power of a battery according to an embodiment of the present invention. As shown in fig. 2, a corresponding relationship between the voltage of the battery and the remaining capacity of the battery may be established, where V1 represents the charging upper limit voltage of the battery, and SOC1 is the remaining capacity corresponding to the charging upper limit voltage of the battery; v2 represents the lower limit discharge voltage of the battery, and SOC2 represents the remaining amount of electricity corresponding to the lower limit discharge voltage of the battery.

In a specific implementation process, by using a corresponding relationship between a voltage of a battery and a remaining capacity of the battery, it is only required to detect whether a maximum remaining capacity of the battery is greater than or equal to a remaining capacity corresponding to a preset upper charging limit voltage, and detect whether a minimum remaining capacity of the battery is less than or equal to a remaining capacity corresponding to a preset lower discharging limit voltage, so as to determine whether the battery completes one battery cycle.

For example, for a battery with an operating voltage interval of 3.0V to 4.35V, the initial voltage of the battery is less than the upper charging limit voltage of the battery, the remaining capacity corresponding to the upper charging limit voltage of the battery is 98%, and the remaining capacity corresponding to the lower discharging limit voltage of the battery is 10%, it is only necessary to determine that the maximum remaining capacity of the battery is greater than or equal to 98% of the remaining capacity corresponding to the upper charging limit voltage of the battery and the minimum remaining capacity of the battery is less than or equal to 10% of the remaining capacity corresponding to the lower discharging limit voltage of the battery during the cycling of the battery, so that the number of cycles of the battery can be determined. If the maximum remaining capacity of the battery is greater than or equal to 98% of the remaining capacity corresponding to the upper charging limit voltage of the battery and the minimum remaining capacity of the battery is less than or equal to 10% of the remaining capacity corresponding to the lower discharging limit voltage of the battery for 3 times in the cycle process of the battery, the cycle number of the acquired battery is 3.

In a specific implementation process, the remaining amount of the battery corresponding to the charging upper limit voltage of the battery may be 80% to 100%; the remaining amount of the battery corresponding to the discharge lower limit voltage of the battery may be 0% to 15%.

It can be understood that the implementation manner for acquiring the cycle number of the battery provided by the embodiment of the present invention may be used for acquiring the total cycle number of the battery, and may also be used for acquiring the cycle number interval of the battery.

Specifically, in the embodiment of the present invention, the total cycle number of the battery is obtained, and the cycle number of the battery can be counted accumulatively, and the counting is uninterrupted in the process of recycling the battery; and acquiring the cycle number interval of the battery, counting the cycle number of the battery in a segmented manner, and clearing the count of the cycle number and restarting counting if the cycle number interval of the battery reaches a preset value.

It should be noted that during the recycling process of the battery, the battery goes through at least one charging process and at least one discharging process. The sequence of the charging process and the discharging process of the battery is not particularly limited in the embodiments of the present invention. In a specific implementation, a battery cycle may be performed first during a charging process and then during a discharging process, or a battery cycle may be performed first during a discharging process and then during a charging process.

In a second aspect, an accumulated time of the battery is obtained.

Specifically, in the embodiment of the present invention, if the state information of the battery is the accumulated time of the battery, the state information of the battery is acquired, that is, the accumulated time of the battery is acquired. Specifically, in the embodiment of the present invention, there may be multiple implementations of acquiring the accumulated time of the battery, and this is not particularly limited in the embodiment of the present invention.

In a specific implementation process, in the embodiment of the present invention, acquiring the accumulated time of the battery may include, but is not limited to: and timing the accumulated time of the battery to obtain the accumulated time of the battery.

It can be understood that the implementation manner for acquiring the accumulated time of the battery provided by the embodiment of the present invention may be used to acquire the total accumulated time of the battery, and may also be used to acquire the accumulated time interval of the battery.

Specifically, in the embodiment of the present invention, the total accumulated time of the battery is obtained, so that the accumulated time of the battery can be cumulatively counted, and the counting is uninterrupted in the recycling process of the battery; the accumulated time interval of the battery can be acquired, the accumulated time of the battery can be timed in a segmented mode, and if the accumulated time interval of the battery reaches a preset value, the timing of the accumulated time is cleared, and the timing is restarted.

In a third aspect, capacity status information of a battery is obtained.

Specifically, in the embodiment of the present invention, if the usage data of the battery is the capacity state information of the battery, the usage data of the battery, that is, the capacity state information of the battery, is acquired. Specifically, in the embodiment of the present invention, there may be multiple implementation manners for acquiring the capacity state information of the battery, and the embodiment of the present invention is not particularly limited in this respect.

Specifically, in each cycle of the battery, the charging capacity of the battery is not necessarily equal to the discharging capacity of the battery, and in the embodiment of the present invention, the charging capacity of the battery may be obtained as the current capacity of the battery, or the discharging capacity of the battery may also be obtained as the current capacity of the battery. It can be understood that, in the practical application process, which of the capacities is obtained as the current capacity of the battery may be determined according to practical needs, and this is not particularly limited in the embodiment of the present invention.

In one particular implementation, the charge capacity of the battery may be obtained as the current capacity of the battery. Specifically, the first electric quantity and the second electric quantity can be obtained; the first electric quantity is the residual electric quantity of the battery at the beginning of the last charging process, and the second electric quantity is the electric quantity charged by the battery from the first electric quantity to the full charge of the battery in the last charging process; then, the sum of the first electric quantity and the second electric quantity is calculated, and the current capacity of the battery can be obtained.

Alternatively, in another specific implementation, the discharge capacity of the battery may be obtained as the current capacity of the battery. Specifically, the third electric quantity and the fourth electric quantity may be acquired; the third electric quantity is the electric quantity discharged by the battery from full charge and discharge to a certain voltage, and the fourth electric quantity is the residual electric quantity when the battery discharge is finished; and then, calculating the sum of the third electric quantity and the fourth electric quantity to obtain the current capacity of the battery.

It should be noted that, in the recycling process of the battery, the Solid electrolyte interface film (SEI) on the surface of the anode of the battery is in a dynamic process of continuous destruction and repair, and a certain amount of charging electricity is consumed in the process of SEI repair of the anode; in addition, under certain conditions, part of the electric quantity charged in the battery in the charging process is converted into a side reaction product of the battery. Therefore, the discharge capacity of the battery can better reflect the use state of the battery, the discharge capacity of the battery is obtained as the current capacity of the battery, the current capacity of the battery is closer to the practical application, and the method is more beneficial to prolonging the cycle life of the battery.

It should be understood that the foregoing examples are only used to illustrate an implementation manner of obtaining the current capacity of the battery, and are not used to limit the application, and the embodiment of the present invention does not particularly limit a specific implementation process of obtaining the current capacity of the battery.

Specifically, in the embodiment of the present invention, the capacity retention rate of the battery may be determined according to the current capacity of the battery.

In a specific implementation process, the capacity retention rate of the battery can be obtained according to the current capacity of the battery and the initial capacity of the battery.

It should be noted that the initial capacity of the battery is the actual capacity discharged from the first time of full charge to full discharge during the actual use of the battery.

Alternatively, in another specific implementation process, the capacity retention rate of the battery can also be obtained according to the current capacity of the battery and the nominal capacity of the battery.

It should be noted that the nominal capacity of the battery is the capacity provided in the specification of the battery. Specifically, the nominal capacity of the battery may be the minimum value of the capacities of the batteries of the models, or the nominal capacity of the battery may be the average value of the capacities of the batteries of the models, depending on the suppliers of the batteries.

In a fourth aspect, energy state information of a battery is obtained.

Specifically, in the embodiment of the present invention, if the usage data of the battery is the energy state information of the battery, the usage data of the battery, that is, the energy state information of the battery, is obtained. Specifically, in the embodiment of the present invention, there may be multiple implementation manners for acquiring the energy state information of the battery, and the embodiment of the present invention is not particularly limited in this respect.

Specifically, in each cycle of the battery, the charging energy of the battery is not necessarily equal to the discharging energy of the battery, and in the embodiment of the present invention, the charging energy of the battery may be acquired as the current energy of the battery, or the discharging energy of the battery may also be acquired as the current energy of the battery. It can be understood that, in the practical application process, which of the above-mentioned energies is obtained as the current energy of the battery may be determined according to practical needs, and this is not particularly limited in the embodiment of the present invention.

In one specific implementation, the charging energy of the battery may be obtained as the current energy of the battery. Specifically, the first energy and the second energy can be obtained; the first energy is the residual energy of the battery at the beginning of the last charging process, and the second energy is the energy charged by the battery from the first energy to the full charge of the battery in the last charging process; then, the sum of the first energy and the second energy is calculated, and the current energy of the battery can be obtained.

Alternatively, in another specific implementation, the discharge energy of the battery may be obtained as the current energy of the battery. Specifically, the third energy and the fourth energy may be obtained; the third energy is the energy released by the battery from full charge and discharge to a certain voltage, and the fourth energy is the residual energy when the battery discharge is finished; and then, calculating the sum of the third energy and the fourth energy to obtain the current energy of the battery.

It should be noted that, in the process of recycling the battery, the solid electrolyte interface film on the surface of the anode of the battery is in the dynamic process of continuous destruction and repair, and a certain amount of charge electricity is consumed in the process of SEI repair of the anode; in addition, under certain conditions, part of the electric quantity charged in the battery in the charging process is converted into a side reaction product of the battery. Therefore, the discharge energy of the battery can better reflect the use state of the battery, the discharge energy of the battery is obtained as the current energy of the battery, the current energy of the battery is closer to the practical application, and the method is more beneficial to prolonging the cycle life of the battery.

It should be understood that the above examples are only used to illustrate the implementation manner of obtaining the current energy of the battery, and are not used to limit the application, and the embodiment of the present invention does not particularly limit the specific implementation process of obtaining the current energy of the battery.

Specifically, in the embodiment of the present invention, the energy retention rate of the battery can be determined according to the current energy of the battery.

In a specific implementation, the energy retention rate of the battery can be obtained according to the current energy of the battery and the initial energy of the battery.

It should be noted that the initial energy of the battery is the actual energy discharged from the battery during the actual use process from the full charge to the full discharge.

Alternatively, in another specific implementation, the energy retention rate of the battery can be obtained based on the current energy of the battery and the nominal energy of the battery.

It should be noted that the nominal energy of the battery is the energy provided in the specification of the battery. Specifically, the nominal energy of the battery may be the minimum value of the energy of the battery of the model, or the nominal energy of the battery may be the average value of the energy of the battery of the model, according to different battery suppliers.

It should be noted that, in the embodiment of the present invention, when the state information of the battery is acquired, the battery is in a use state or in a storage state in the charging process and the discharging process, which is not particularly limited in the embodiment of the present invention.

in the embodiment of the invention, the service condition of the battery can be clearly represented by considering the state information of the battery, such as the cycle number of the battery and the accumulated time of the battery, and the various implementation modes for acquiring the state information of the battery are provided, so that the judgment process for subsequently judging whether to adjust the charging power of the battery can be more fit with the actual service condition of the battery after the state information of the battery is conveniently acquired, and therefore, the effect of reducing the polarization speed of the battery can be really achieved by adjusting the charging power according to the actual service condition of the battery, further, the loss speed of the battery in the cycle charging process is reduced to a certain extent, and the cycle life of the battery is prolonged.

EXAMPLE III

Based on the method for charging a battery provided in the first embodiment of the present invention, the first embodiment of the present invention specifically describes an implementation manner of "determining whether a condition for reducing charging power of the battery is satisfied according to the state information of the battery" in S102 in the first embodiment of the present invention.

Specifically, the determining whether the condition for reducing the charging power of the battery is satisfied according to the acquired state information of the battery may include, but is not limited to, the following four implementation manners:

the first method comprises the following steps: if the acquired state information of the battery is the cycle number of the battery, comparing the cycle number of the battery with a corresponding number threshold; when the cycle number of the battery is the corresponding number threshold, judging that the condition of reducing the charging power of the battery is satisfied; or, when the cycle number of the battery is not the corresponding number threshold, determining that the condition for reducing the charging power of the battery is not satisfied.

Specifically, if the acquired state information of the battery is the total cycle number of the battery, the total cycle number of the battery is compared with the corresponding total number threshold, and if the total cycle number of the battery is the corresponding total number threshold, the condition of reducing the charging power of the battery is judged to be satisfied.

Or, if the acquired state information of the battery is the cycle number interval of the battery, comparing the cycle number interval of the battery with the corresponding interval number threshold, and if the cycle number interval of the battery is the corresponding interval number threshold, judging that the condition for reducing the charging power of the battery is satisfied.

It can be understood that, if the acquired state information of the battery is the total cycle number and the cycle number interval, the total cycle number of the acquired battery may be compared with the total number threshold, and the acquired cycle number interval may be compared with the interval number threshold, and if at least one of the acquired total cycle number of the battery is the total number threshold and the acquired cycle number interval is the interval number threshold is satisfied, the condition for reducing the charging power of the battery is determined to be satisfied.

It should be noted that, in the embodiment of the present invention, at least one threshold value of the number of batteries may be set, and this is not particularly limited in the embodiment of the present invention. For example, the number threshold of the batteries may be set to N1, N2 … … Nn, N being an integer greater than 0. When the acquired cycle number of the battery is compared with the number threshold, it is only required that when the acquired cycle number of the battery is equal to one of the preset at least one number threshold, that is, the acquired cycle number of the battery is judged to be the corresponding number threshold, and then the condition of reducing the charging power of the battery is judged to be satisfied.

For example, it is assumed that the total number threshold corresponding to the total cycle number of the battery is preset to be 10, 20, 30, that is, when the total cycle number of the battery reaches 10 th cycle, 20 th cycle, 30 th cycle, it is considered that the condition for reducing the charging power of the battery is reached. Alternatively, for another example, assuming that the interval number threshold corresponding to the cycle number interval of the battery is preset to be 5, that is, when the cycle number interval of the battery reaches 5 cycles each time, the condition of reducing the charging power of the battery is considered to be satisfied, at this time, recounting may be started to obtain the next set of cycle number intervals.

It should be noted that the above examples are only for illustrating the present solution, and are not intended to limit the present application. In a specific implementation process, when the total number threshold and the interval number threshold are preset, the preset may be performed according to a fixed adjustment interval, for example, the total number threshold of the preset battery is 5, 10, or 15; alternatively, the preset may be performed at an unfixed adjustment interval, for example, the threshold value of the total number of batteries may be preset to be 5, 15, 30, or the like. The embodiment of the present invention is not particularly limited to this.

The description will be made by taking the example shown in fig. 3. Please refer to fig. 3, which is a flowchart illustrating a second embodiment of a battery charging method according to an embodiment of the present invention. As shown in fig. 3, N is the total cycle number of the acquired battery, m preset total number thresholds are provided, which are N1 and N2 … … Nm respectively, and the initial charging power is W1. At this time, the acquired N is compared with N1, if N < N1, the condition of reducing the charging power of the battery is judged to be not satisfied, and the charging power W1 of the battery is kept unchanged; if N is N1, it is determined that the condition for reducing the battery charging power is satisfied, and the battery charging power W1 is adjusted to the charging power W2.

In the embodiment of the present invention, as shown in fig. 3, at the beginning of the cycle of N — N1, the charging power of the battery is adjusted from W1 to W2, so when N > N1, a second round of comparison and determination is required to determine whether the condition for reducing the charging power of the battery is satisfied again. Therefore, for the loop process of N > N1, the second round of determination of N < N2 is required, and if the second round of determination of N < N2 is yes, the condition for reducing the charging power of the battery is determined not to be satisfied, the charging power of the battery is maintained at W2, and until the number N of loops of the battery is equal to N2, the condition for reducing the charging power of the battery is determined to be satisfied, the charging power of the battery is adjusted from W2 to W3.

In a specific implementation, when the threshold of the number of batteries is preset, the temperature of the batteries is also considered, and the temperature of the batteries may include but is not limited to: at least one of the cell temperature, the ambient temperature of the battery, and the operating temperature of the battery is not particularly limited in this embodiment of the present invention.

Specifically, at least two temperature segments may be pre-divided, and a corresponding number threshold may be set for each temperature segment, and then, the temperature segment corresponding to the current temperature of the battery may be determined according to the current temperature of the battery, so that the number threshold corresponding to the temperature segment is determined to be the number threshold of the battery. It is understood that the number threshold may include, but is not limited to: at least one of the total number threshold and the interval number threshold, which is not particularly limited in the embodiment of the present invention.

In a specific implementation process, when the corresponding total number threshold is set for each temperature segment, a specific threshold set may be set, and a specific value in the threshold set is used as the total number threshold of the battery.

Or, in another specific implementation process, when setting the corresponding interval number threshold for each temperature segment, an initial value and at least one interval value may be set, and the initial value and the interval value may be set to the same value or may be set to different values, which is not particularly limited in this embodiment of the present invention.

The number of intervals threshold of the preset battery is taken as an example for explanation. The ambient temperature of the battery may be divided into three temperature sections, for example, a temperature greater than 40 ℃ is divided into a high temperature section; the temperature range of 15-35 ℃ is divided into a middle temperature section, and the temperature less than 15 ℃ is divided into a low temperature section. Then, corresponding interval number thresholds are set for the high-temperature section, the medium-temperature section and the low-temperature section respectively. Because the reaction of the electrolyte with the surfaces of the cathode and the anode is more violent at high temperature and the electrolyte consumption speed is higher, a smaller interval number threshold value can be set for a high-temperature section; at low temperature, the conductivity of the electrolyte is reduced, the viscosity is increased continuously, and lithium is easy to be separated out from the anode in the circulation process, so that at least one smaller numerical range can be set for the high-temperature section and the low-temperature section. Further, in order to avoid a large decrease in the charging speed of the battery due to frequent decrease in the charging power of the battery, the interval number threshold may be set to a tendency to increase as the number of cycles increases. For example, the first threshold number of intervals of the battery may range from [150, 300], while each subsequent threshold number of intervals may range from [300, 800 ]. Due to the moderate temperature, a relatively large number threshold interval may be set for the medium temperature section relative to the high temperature section, e.g., the first number threshold interval of the battery may range from [300, 500], while the subsequent number threshold intervals may range from [500, 1000 ]. Therefore, after the current temperature of the battery is determined, the temperature section corresponding to the current temperature can be determined, and further, according to the temperature section, the number threshold interval number threshold value of the battery is set in the number threshold interval range corresponding to the temperature section.

And the second method comprises the following steps: if the acquired state information of the battery is the accumulated time of the battery, comparing the accumulated time of the battery with a corresponding time threshold; when the accumulated time of the battery is the corresponding time threshold, judging that the condition of reducing the charging power of the battery is satisfied; alternatively, when the accumulated time of the battery is not equal to the corresponding time threshold, it is determined that the condition for reducing the charging power of the battery is not satisfied.

Specifically, when the accumulated time of the battery is equal to the corresponding time threshold, that is, the accumulated time of the battery is equal to the corresponding time threshold, it may be determined that the condition for reducing the charging power of the battery is satisfied.

It is understood that if the accumulated time of the battery is less than or greater than the corresponding time threshold, that is, the accumulated time of the battery is not the corresponding time threshold, the condition for reducing the charging power of the battery is determined to be not satisfied.

Specifically, if the acquired state information of the battery is the total accumulated time of the battery, the total accumulated time of the battery is compared with the corresponding total time threshold, and if the total accumulated time of the battery is the corresponding total time threshold, the condition for reducing the charging power of the battery is judged to be satisfied.

Or, specifically, if the acquired state information of the battery is the accumulated time interval of the battery, the accumulated time interval of the battery is compared with the corresponding interval time threshold, and if the accumulated time interval of the battery is the corresponding interval time threshold, it is determined that the condition for reducing the charging power of the battery is satisfied.

It is understood that, if the acquired state information of the battery is the total accumulated time and the accumulated time interval, the total accumulated time of the acquired battery may be compared with the total time threshold, and the acquired accumulated time interval may be compared with the interval time threshold, and if at least one of the total accumulated time of the acquired battery and the acquired accumulated time interval is satisfied, the condition for reducing the charging power of the battery is determined to be satisfied.

It should be noted that, in the embodiment of the present invention, a time threshold of at least one battery may be set, and this is not particularly limited in the embodiment of the present invention. For example, the time threshold of the battery may be set to T1, T2 … … Tm, and m is an integer greater than 0. When the acquired accumulated time of the battery is compared with the time threshold, it is only required that when the acquired accumulated time of the battery is equal to one of the preset at least one time threshold, that is, the acquired accumulated time of the battery is determined to be the corresponding time threshold, and then the condition for reducing the charging power of the battery is determined to be satisfied.

For example, it is assumed that the total time threshold corresponding to the total accumulated time of the battery is preset to be 10, 20, and 30, that is, when the total accumulated time of the battery reaches 10 th month, 20 th month, and 30 th month, it is considered that the condition for reducing the charging power of the battery is reached. Alternatively, for example, it is assumed that the interval time threshold corresponding to the accumulated time interval of the battery is preset to be 5, that is, when the accumulated time interval of the battery reaches 5 each time, it is considered that the condition for reducing the charging power of the battery is satisfied, and at this time, the re-timing is started to obtain the next group of accumulated time intervals.

It should be noted that the above examples are only for illustrating the present solution, and are not intended to limit the present application. In a specific implementation process, when the total time threshold and the interval time threshold are preset, the total time threshold and the interval time threshold may be preset according to a fixed adjustment interval, for example, the total time threshold of the battery is preset to be 5, 10, or 15; alternatively, the preset may be performed at an unfixed adjustment interval, for example, the total time threshold of the battery may be preset to be 5, 15, 30, and the like. The embodiment of the present invention is not particularly limited to this.

Alternatively, in another specific implementation, a time interval threshold of at least two batteries may be set during the entire cycle of the batteries. For example, if the interval time threshold of the battery is preset to be 5 and 10, the acquired accumulated time interval of the battery may be preset to be alternately compared with the interval time thresholds 5 and 10 in the whole circulation process of the battery; alternatively, the interval time threshold 5 may be used to compare the accumulated time interval of the battery in at least one previous comparison process, and the interval time threshold 10 may be used to compare the accumulated time interval of the battery in a subsequent comparison process. It should be understood that this example is only for illustrating the present solution and is not intended to limit the present application. In the embodiment of the present invention, the sequence and rule for comparing at least two interval time thresholds with the accumulated time interval of the battery may be set according to actual needs, which is not particularly limited in the embodiment of the present invention.

The description will be made by taking the example shown in fig. 4. Please refer to fig. 4, which is a flowchart illustrating a third embodiment of a battery charging method according to an embodiment of the present invention. As shown in fig. 4, when the battery starts to be used in a cycle, the timing is started to obtain the cumulative time interval of the battery: t1 and T2 … … Tm, the preset m interval time thresholds are respectively T1 and T2 … … Tm, and the initial charging power is W1. At this time, the obtained T1 is compared with T1. If T1< T1, judging that the condition for reducing the charging power of the battery is not satisfied; alternatively, when T1 is satisfied, T1, the determination of T1< T1 is no, and it is determined that the condition for reducing the charging power of the battery is satisfied.

As shown in fig. 4, in the embodiment of the present invention, at the beginning of a cycle when T1 is T1, the charging power of the battery is adjusted from W1 to W2; at this time, the timer starts to count again to obtain the 2 nd accumulated time interval t 2; thereafter, it is necessary to determine the magnitude relationship between T2 and the corresponding interval time threshold T2 to determine whether the condition for reducing the charging power of the battery is satisfied again.

In a specific implementation, when the time threshold of the battery is preset, the temperature of the battery is also considered, and the temperature of the battery may include but is not limited to: at least one of the cell temperature, the ambient temperature of the battery, and the operating temperature of the battery is not particularly limited in this embodiment of the present invention.

Specifically, at least two temperature segments may be pre-divided, and a corresponding time threshold may be set for each temperature segment, and then, the temperature segment corresponding to the current temperature of the battery may be determined according to the current temperature of the battery, so that the time threshold corresponding to the temperature segment is determined to be the time threshold of the battery. It is understood that the time threshold may include, but is not limited to: at least one of the total time threshold and the interval time threshold, which is not particularly limited in the embodiment of the present invention.

In another specific implementation, when the corresponding total time threshold is set for each temperature segment, a specific threshold set may be set, and a specific value in the threshold set is used as the total time threshold of the battery.

Or, in another specific implementation process, when setting a corresponding interval time threshold for each temperature segment, an initial value and at least one interval value may be set, and the initial value and the interval value may be set to the same value or may be set to different values, which is not particularly limited in this embodiment of the present invention.

And the third is that: if the state information of the battery is the capacity state information of the battery, comparing the capacity state information of the battery with a corresponding capacity threshold value; when the capacity state information of the battery is the corresponding capacity threshold value, judging that the condition of reducing the charging power of the battery is satisfied; alternatively, when the capacity state information of the battery is not the corresponding capacity threshold, it is determined that the condition for reducing the charging power of the battery is not satisfied.

Specifically, if the acquired state information of the battery is the current capacity of the battery, the current capacity of the battery is compared with the corresponding first capacity threshold, and if the current capacity of the battery is the corresponding first capacity threshold, the condition for reducing the charging power of the battery is judged to be satisfied.

Or, specifically, if the acquired state information of the battery is the capacity retention rate of the battery, the capacity retention rate of the battery is compared with the corresponding second capacity threshold, and if the capacity retention rate of the battery is the corresponding second capacity threshold, the condition for reducing the charging power of the battery is determined to be satisfied.

It can be understood that, if the acquired state information of the battery is the current capacity and the capacity retention rate, the acquired current capacity of the battery may be compared with a first capacity threshold, the acquired capacity retention rate may be compared with a second capacity threshold, and if at least one of the acquired current capacity of the battery is the first capacity threshold and the acquired capacity retention rate is the second capacity threshold is satisfied, the condition for reducing the charging power of the battery is determined to be satisfied.

It should be noted that, in the embodiment of the present invention, at least one capacity threshold may be preset, and this is not particularly limited in the embodiment of the present invention. Specifically, the preset capacity thresholds may be the same in value, and may be different from each other, which is not particularly limited in this embodiment of the present invention.

In a specific implementation process, if at least two capacity thresholds with different values are preset, the capacity thresholds may be sorted in descending order of values, and the acquired capacity state information of the battery is sequentially compared with the sorted capacity thresholds.

It should be noted that, after the capacity state information of the battery acquired at the nth time is equal to the mth capacity threshold, it is determined that the preset condition for reducing the charging power of the battery is satisfied at this time; since the capacity state information of the battery is in a gradually decreasing trend, the capacity state information of the battery acquired at the (N + 1) th time is certainly smaller than the capacity state information acquired at the (N) th time, that is, the capacity state information of the battery acquired at the (N + 1) th time is certainly smaller than the Mth capacity threshold; therefore, when determining whether the preset adjustment condition is satisfied according to the capacity state information of the battery acquired at the (N + 1) th time, the capacity state information of the battery acquired at the (N + 1) th time needs to be compared with the (M + 1) th capacity threshold. After sorting the capacity thresholds from large to small according to the numerical value, the numerical value of the Mth capacity threshold is larger than the numerical value of the M +1 th capacity threshold, N is an integer larger than 0, and M is an integer larger than 0.

Or if the capacity state information of the battery acquired for the Nth time is larger than the Mth capacity threshold, judging that the condition for reducing the charging power of the battery is not met; since the capacity state information of the battery is in a gradually decreasing trend, the capacity state information of the battery acquired at the (N + 1) th time is certainly less than or equal to the capacity state information acquired at the (N) th time, that is, the relation between the capacity state information of the battery acquired at the (N + 1) th time and the Mth capacity threshold is not determined; therefore, when it is determined whether the condition for reducing the charging power of the battery is satisfied or not based on the capacity state information of the battery acquired at the (N + 1) th time, the capacity state information of the battery acquired at the (N + 1) th time still needs to be compared with the mth capacity threshold.

In a specific implementation process, when the first capacity threshold and the second capacity threshold are preset, the preset may be performed according to a fixed adjustment interval, for example, the first capacity threshold of the preset battery is 1700mAh, 1900mAh, 1800 mAh; alternatively, the second capacity threshold may be preset at an unfixed adjustment interval, for example, 90%, 85%, 70%, or the like. The embodiment of the present invention is not particularly limited to this.

For example, please refer to fig. 5, which is a flowchart illustrating a fourth embodiment of the method for charging a battery according to the embodiment of the present invention.

As shown in fig. 5, R is the obtained capacity retention rate of the battery, the preset n second capacity thresholds are R1 and R2 … … Rn, respectively, and the initial charging power is W1. When the battery starts to be recycled, comparing the acquired R with R1, if R is greater than R1, namely the capacity retention rate of the battery is greater than a second capacity threshold value, judging that the condition for reducing the charging power of the battery is not met, keeping the charging power W1 of the battery unchanged, and charging the battery to a charging cut-off voltage V1 by using W1; if R is equal to R1, at this time, the capacity retention rate of the battery is equal to the second capacity threshold, the condition for reducing the charging power of the battery is judged to be satisfied, the charging power of the battery is adjusted from W1 to W2, and the battery is charged to V2 by using W2.

As shown in fig. 5, in the embodiment of the present invention, if the case where R is R1 has already occurred and the charging power of the battery is adjusted from W1 to W2 when R is R1, then R acquired again is smaller than or equal to R1 for a certain time, at this time, it is determined that R and R2 acquired newly are determined, and if it is determined that R > R2 in the second round, the condition for reducing the charging power of the battery again is not satisfied, the charging power of the battery is maintained at W2, and it is determined that the condition for reducing the charging power of the battery is satisfied again until the capacity retention ratio of the battery is R2, and the charging power of the battery is adjusted from W2 to W3.

In a specific implementation, when the capacity threshold of the battery is preset, the temperature of the battery is also considered, and the temperature of the battery may include but is not limited to: at least one of the cell temperature, the ambient temperature of the battery, and the operating temperature of the battery is not particularly limited in this embodiment of the present invention.

Specifically, at least two temperature segments may be pre-divided, and a corresponding capacity threshold may be set for each temperature segment, and then, the temperature segment corresponding to the current temperature of the battery may be determined according to the current temperature of the battery, so that the capacity threshold corresponding to the temperature segment is determined to be the capacity threshold of the battery.

It is understood that the capacity threshold may include, but is not limited to: at least one of the first capacity threshold and the second capacity threshold is not particularly limited in this embodiment of the present invention.

In a specific implementation process, when setting the corresponding first capacity threshold for each temperature segment, a specific threshold set may be set, and a specific value in the threshold set is used as the first capacity threshold.

Or, in another specific implementation process, when the corresponding second capacity threshold is set for each temperature segment, an initial value and at least one interval value may be set, and the initial value and the interval value may be set to be the same value or may be set to be different values, which is not particularly limited in this embodiment of the present invention.

The second capacity threshold is taken as an example for illustration. The ambient temperature of the battery may be divided into three temperature sections, for example, a temperature greater than 40 ℃ is divided into a high temperature section; the temperature range of 15-35 ℃ is divided into a middle temperature section, and the temperature less than 15 ℃ is divided into a low temperature section. Then, adjustment intervals of corresponding second capacity thresholds are set for the high-temperature section, the medium-temperature section and the low-temperature section respectively. Because the reaction of the electrolyte with the surfaces of the cathode and the anode is more violent at high temperature and the electrolyte consumption speed is higher, a second capacity threshold value can be set for a high-temperature section at a smaller adjustment interval; at low temperatures, the viscosity of the electrolyte solution is increased due to the decrease in conductivity, which makes the anode more susceptible to lithium deposition during cycling. Therefore, at least one smaller numerical range may be set for the high temperature section and the low temperature section, and further, in order to avoid a large decrease in the charging speed of the battery due to frequent decrease in the charging power of the battery, the adjustment interval of the second capacity threshold may be set to a tendency to decrease with a decrease in the capacity retention rate. For example, the adjustment interval range of each second capacity threshold of the battery may be [5, 10 ]. Due to the moderate temperature, a second capacity threshold with a larger adjustment interval compared with the high temperature section can be set for the medium temperature section, for example, the adjustment interval range of each second capacity threshold of the battery can be [10, 20 ]. Therefore, after the current temperature of the battery is determined, the temperature section corresponding to the current temperature can be determined, and further, according to the determined temperature section, the second capacity threshold of the battery is set within the adjustment interval range of the second capacity threshold corresponding to the temperature section.

And fourthly: if the state information of the battery is the energy state information of the battery, comparing the energy state information of the battery with a corresponding energy threshold value; when the energy state information of the battery is the corresponding energy threshold value, judging that the condition of reducing the charging power of the battery is satisfied; or, when the energy state information of the battery is not the corresponding energy threshold, the condition for reducing the charging power of the battery is judged to be not satisfied.

Specifically, if the acquired state information of the battery is the current energy of the battery, the current energy of the battery is compared with the corresponding first energy threshold, and if the current energy of the battery is the corresponding first energy threshold, the condition for reducing the charging power of the battery is judged to be satisfied.

Or, specifically, if the acquired state information of the battery is the energy retention rate of the battery, the energy retention rate of the battery is compared with the corresponding second energy threshold, and if the energy retention rate of the battery is the corresponding second energy threshold, the condition for reducing the charging power of the battery is determined to be satisfied.

It can be understood that, if the acquired state information of the battery is the current energy and the energy retention rate, the acquired current energy of the battery may be compared with a first energy threshold, the acquired energy retention rate may be compared with a second energy threshold, and if at least one of the acquired current energy of the battery is the first energy threshold and the acquired energy retention rate is the second energy threshold, the condition of reducing the charging power of the battery is determined to be satisfied.

It should be noted that, in the embodiment of the present invention, at least one energy threshold may be preset, and this is not particularly limited in the embodiment of the present invention. Specifically, the preset energy threshold may be the same or different, and this is not particularly limited in the embodiment of the present invention.

In a specific implementation process, if at least two energy thresholds with different values are preset, the energy thresholds can be sorted according to the descending order of the values, and the acquired energy state information of the battery is sequentially compared with the sorted energy thresholds.

It should be noted that, after the energy state information of the battery acquired for the xth time is equal to the yth energy threshold, it is determined that the preset condition for reducing the charging power of the battery is satisfied at this time; because the energy state information of the battery is in a gradually decreasing trend, the energy state information of the battery acquired at the X +1 th time is necessarily smaller than or equal to the energy state information acquired at the X +1 th time, namely the energy state information of the battery acquired at the X +1 th time is necessarily smaller than or equal to the Y-th energy threshold; therefore, when determining whether the preset adjustment condition is met according to the energy state information of the battery acquired at the X +1 th time, the energy state information of the battery acquired at the X +1 th time needs to be compared with the Y +1 th energy threshold. After sorting the energy thresholds according to the magnitude of the numerical values from large to small, the numerical value of the Y-th energy threshold is larger than the numerical value of the Y + 1-th energy threshold, X is an integer larger than 0, and Y is an integer larger than 0.

Or if the energy state information of the battery acquired for the Xth time is larger than the Yth energy threshold, judging that the preset condition for reducing the charging power of the battery is not met; because the energy state information of the battery is in a gradually decreasing trend, the energy state information of the battery acquired at the X +1 th time is necessarily smaller than or equal to the energy state information acquired at the X +1 th time, namely the relationship between the energy state information of the battery acquired at the X +1 th time and the Y-th energy threshold is not determined; therefore, when determining whether the preset adjustment condition is met according to the energy state information of the battery acquired at the X +1 th time, the energy state information of the battery acquired at the X +1 th time still needs to be compared with the Y-th energy threshold.

In a specific implementation process, when the first energy threshold and the second energy threshold are preset, the preset may be performed according to a fixed adjustment interval, for example, the second energy threshold of the battery is preset to be 90%, or 90%; alternatively, the second energy threshold may be preset at an unfixed adjustment interval, for example, the second energy threshold of the battery may be preset to 90%, 85%, 70%, or the like. The embodiment of the present invention is not particularly limited to this.

For example, please refer to fig. 6, which is a flowchart illustrating a fifth embodiment of a method for charging a battery according to an embodiment of the present invention.

As shown in fig. 6, Q is the acquired current energy of the battery, the preset n first energy thresholds are Q1 and Q2 … … Qn, respectively, and the initial charging power is W1. When the battery starts to be recycled, comparing the obtained Q with Q1, if Q is greater than Q1, namely the current energy of the battery is greater than a first energy threshold value, judging that the condition for reducing the charging power of the battery is not met, keeping the charging power W1 of the battery unchanged, and charging the battery to a charging cut-off voltage V1 by using W1; if Q is equal to Q1, at this time, the current energy of the battery is equal to the first energy threshold value, the condition for reducing the charging power of the battery is judged to be satisfied, the charging power of the battery is adjusted from W1 to W2, and the battery is charged to V2 by using W2.

As shown in fig. 6, in the embodiment of the present invention, if the case of Q being Q1 has already occurred, and the charging power of the battery is adjusted from W1 to W2 when Q being Q1, so that Q acquired again later is certainly smaller than Q1, at this time, the newly acquired Q is compared with Q2 for determination, and if the second round of determination that Q > Q2 is yes, the condition for reducing the charging power of the battery again is still not satisfied, the charging power of the battery is kept at W2, and until the current energy of the battery appears Q being Q2, it is determined that the condition for reducing the charging power of the battery is satisfied again, and the charging power of the battery is adjusted from W2 to the charging power W3.

In a specific implementation, when the energy threshold of the battery is preset, the temperature of the battery is also considered, and the temperature of the battery may include but is not limited to: at least one of the cell temperature, the ambient temperature of the battery, and the operating temperature of the battery is not particularly limited in this embodiment of the present invention.

Specifically, at least two temperature segments may be pre-divided, and a corresponding energy threshold may be set for each temperature segment, so that the temperature segment corresponding to the current temperature of the battery may be determined according to the current temperature of the battery, and thus, the energy threshold corresponding to the temperature segment is determined to be the energy threshold of the battery.

It is understood that the energy threshold may include, but is not limited to: at least one of the first energy threshold and the second energy threshold is not particularly limited in this respect.

In a specific implementation process, when the corresponding first energy threshold is set for each temperature segment, a specific threshold set may be set, and a specific value in the threshold set is used as the first energy threshold.

Alternatively, in another specific implementation process, when the corresponding second energy threshold is set for each temperature segment, an initial value and at least one interval value may be set, and the initial value and the interval value may be set to be the same value or may be set to be different values, which is not particularly limited in this embodiment of the present invention.

The second energy threshold is taken as an example for illustration. The ambient temperature of the battery may be divided into three temperature sections, for example, a temperature greater than 40 ℃ is divided into a high temperature section; the temperature range of 15-35 ℃ is divided into a middle temperature section, and the temperature less than 15 ℃ is divided into a low temperature section. And then setting corresponding adjustment intervals of a second energy threshold value for the high-temperature section, the medium-temperature section and the low-temperature section respectively. Because the reaction of the electrolyte with the surfaces of the cathode and the anode is more violent at high temperature and the electrolyte consumption speed is higher, a second energy threshold value can be set for a high-temperature section at a smaller adjustment interval; at low temperature, the conductivity of the electrolyte is reduced, the viscosity is increased continuously, and lithium is easy to be separated out from the anode in the circulation process, so that at least one smaller numerical range can be set for the high-temperature section and the low-temperature section. Further, in order to avoid a large decrease in the charging speed of the battery due to frequent decrease in the charging power of the battery, the adjustment interval of the second energy threshold may be set to a tendency to decrease with a decrease in the energy retention rate. For example, the adjustment interval range of each second energy threshold of the battery may be [5, 10 ]. Due to the moderate temperature, a second energy threshold with a larger adjustment interval compared with the high temperature section can be set for the medium temperature section, for example, the adjustment interval range of each second energy threshold of the battery can be [10, 20 ]. Therefore, after the current temperature of the battery is determined, the temperature section corresponding to the current temperature can be determined, and then the second energy threshold of the battery is set within the adjustment interval range of the second energy threshold corresponding to the temperature section according to the determined temperature section.

In the embodiment of the present invention, whether the condition for reducing the charging power of the battery is satisfied or not may be determined according to actual needs according to what kind of state information of the battery, which is not particularly limited in the embodiment of the present invention.

For example, for a constant-power discharging product, the product of power and time is the energy of the battery, so the energy of the battery determines the duration of the constant-power discharging product in one discharging process, and at this time, the battery system only needs to detect the discharging power and the discharging time to obtain the energy state information of the battery, including the current energy of the battery and/or the energy conservation rate of the battery. Meanwhile, when the capacity state information of the constant-power discharge product is acquired, the battery needs to integrate the discharge current of the battery and time integration through an algorithm to calculate the current capacity of the battery, the steps are complicated, errors are easy to generate, and the method is unfavorable for prolonging the cycle life of the battery. Therefore, whether the condition of reducing the charging power of the battery is met or not can be judged according to the energy state information of the constant-power discharge product.

Or, for another example, for a constant-current discharge product, the capacity of the battery determines the duration of a discharge process of the constant-current discharge product, and in this case, the battery system only needs to detect the discharge current and the discharge time to obtain the capacity state information of the battery, including the capacity of the battery and/or the capacity retention rate of the battery. Meanwhile, when the energy state information of the constant-current discharge product is acquired, the battery needs to calculate the energy of the battery by integrating the discharge current of the battery and integrating the voltage and the time through an algorithm, and the method is unfavorable for prolonging the cycle life of the battery. Therefore, whether the condition for reducing the charging power of the battery is satisfied can be judged according to the capacity state information of the constant current discharge product.

It should be noted that, the above several implementation manners are only used to describe how to determine whether the condition for reducing the charging power of the battery is satisfied according to the state information of the battery, and in a specific implementation process, the determination may be performed by one implementation manner described above, or may be performed by a combination manner of the two implementation manners described above, which is not particularly limited in this embodiment of the present invention.

The above method is described by taking a combination of two implementations as an example.

In a specific implementation process, please refer to fig. 7, which is a flowchart illustrating a sixth embodiment of a battery charging method according to an embodiment of the present invention.

As shown in fig. 7, N1 and N2 … … Nm are cycle number intervals of the acquired battery, the preset m interval number thresholds are N1 and N2 … … Nm, respectively, T1 and T2 … … T m are accumulated time intervals of the acquired battery, the preset m interval time thresholds are T1 and T2 … … Tm, respectively, and the initial charging power is W1. When the battery starts to be used in a cycle, N1 is obtained by starting counting, N1 is obtained by comparing N1, T1 is obtained by starting timing, and T1 is obtained by comparing T1.

At this time, as shown in fig. 7, if N1< N1 and T1< T1 are simultaneously satisfied, if it is determined that the condition for reducing the charging power of the battery is not satisfied, the charging power W1 of the battery is held and the battery is charged to the voltage V1 using W1. Alternatively, when at least one of N1 — N1 and T1-T1 is satisfied, that is, when the determination is no in T1< T1 and/or the determination is no in N1< N1, it is determined that the condition for reducing the charging power of the battery is satisfied, the charging power of the battery is adjusted from W1 to W2, and the battery is charged to V2 using W2.

Alternatively, in another specific implementation process, please refer to fig. 8, which is a flowchart illustrating a seventh embodiment of the method for charging a battery according to the embodiment of the present invention.

As shown in fig. 8, R is the acquired capacity retention rate of the battery, n preset second capacity thresholds are R1 and R2 … … Rn, Q is the acquired current energy of the battery, n preset first energy thresholds are Q1 and Q2 … … Qn, and the initial charging power is W1. When the battery starts to be recycled, comparing the acquired R with R1, comparing the acquired Q with Q1, and if the conditions of R > R1 and Q > Q1 are simultaneously satisfied, judging that the condition for reducing the charging power of the battery is not satisfied, keeping the charging power W1 of the battery unchanged, and charging the battery to a voltage V1 by using W1; if R > R1 is satisfied and Q is Q1, in this case, the determination of Q > Q1 is no, the condition for reducing the charging power of the battery is determined to be satisfied, the charging power of the battery is adjusted from W1 to W2, and the battery is charged to V2 using W2; alternatively, when R is equal to R1 and Q is equal to Q1, in this case, the determination of R > R1 is no and the determination of Q > Q1 is no, the condition for reducing the charging power of the battery is determined to be satisfied, the charging power of the battery is adjusted from W1 to W2, and the battery is charged to V2 using W2.

It should be understood that the implementation shown in fig. 7 and the implementation shown in fig. 8 are only two possible combinations of the above combinations, and this example is only for illustrating the present solution and is not intended to limit the present application.

the charging method provided by the embodiment of the invention comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, can represent the use data of the battery use condition by acquiring the number of cycles of the battery, the accumulated time of the battery and the like, judges whether the preset conditions are met or not according to the use data, and further determines whether the operation of reducing the charging power of the battery is carried out or not; when the preset condition is met, the charging power of the battery is properly adjusted, and the battery is charged by the reduced charging power, so that the polarization speed of the battery is slowed; therefore, the speed of accumulating byproducts on the anode and the cathode of the battery is slowed down, the damage speed of the crystal form of the cathode material of the battery is slowed down, the oxidation decomposition speed of the electrolyte is slowed down, and the cycle performance of the battery is improved; furthermore, the loss speed of the battery in the cyclic charging process is slowed to a certain extent, and the cycle life of the battery is prolonged.

Example four

Based on the method for charging a battery provided in the first embodiment of the present invention, the first embodiment of the present invention specifically describes an implementation manner of "when it is determined that the condition for reducing the charging power of the battery is satisfied, the charging power of the battery" in S103 in the first embodiment of the present invention.

Specifically, in the embodiment of the present invention, if it is determined that the condition for reducing the charging power of the battery is satisfied according to the state information of the battery, the reduction of the charging power of the battery is to charge the battery with the reduced charging power.

In the embodiment of the present invention, reducing the charging power of the battery may include, but is not limited to, the following two implementation manners:

the first method comprises the following steps: and adjusting the interval according to the preset charging power, and reducing the charging power of the battery.

Specifically, a charging power adjustment interval Δ W may be preset, where Δ W is used to represent an adjustment interval between charging powers of two adjacent batteries. It is understood that aw can include, but is not limited to, at least one numerical value. Then when it is detected that the state information of the battery satisfies the condition of reducing the charging power of the battery, the reduction of the charging power of the battery can be realized by subtracting Δ W from the current charging power.

Taking fig. 3 as an example, if the charging power adjustment intervals Δ W1 and Δ W2 … … Δ Wm-1 are preset, the adjustment interval between W1 and W2 is Δ W1, and the difference between W1 and Δ W1 may be used as the charging power value of W2; the adjustment interval between W2 and W3 is Δ W2, and the difference between W2 and Δ W2 can be used as the charging power value of W3; by analogy, the charging powers W1, W2 … … Wm of the battery are obtained.

Alternatively, for example, when the charging power adjustment interval Δ W is preset to Δ W1 to Δ W2 to … … Δ Wm-1, the adjustment interval between Wm-1 and Wm is Δ W, and the difference between W1 and Δ W may be used as the charging power value of W2, the difference between W2 and Δ W may be used as the charging power value of W3, and the like, so as to obtain the charging powers W1 and W2 … … Wm of the battery.

If the charging power adjustment interval is too large, the degree of reduction of the charging speed of the battery is too large, and the charging time of the battery is further greatly prolonged; if the charging power adjustment interval is too small, the improvement on the cycle life of the battery is not obvious, so that the value of the charging power adjustment interval delta W can be taken within the range of [0.1W, 2W ] in a specific implementation process; in a preferred implementation, the range of the charging power adjustment interval Δ W may be [0.3W, 1W ].

It should be noted that, in the embodiment of the present invention, the charging power adjustment interval Δ W may be set to gradually decrease with the recycling of the battery, so as to avoid the problem of a large decrease in battery capacity caused by an excessive decrease in the charging power of the battery.

And the second method comprises the following steps: taking one candidate charging power lower than the charging power of the battery in a preset charging power candidate set as the charging power of the reduced battery; wherein the charging power candidate set comprises at least one candidate charging power.

For example, a charging power candidate set of the battery may be preset, and the charging power candidate set may include at least one candidate charging power, such as W1, W2, W3, W4, and W5, and when it is detected that the state information of the battery satisfies the condition for reducing the charging power of the battery, the reducing the charging power of the battery may select one candidate charging power lower than the charging power of the current battery among the candidate charging powers W1, W2, W3, W4, and W5. If the current charging power of the battery is W, at this time, W3> W4> W2> W1> W5, at this time, one candidate charging power may be selected from the candidate charging powers W1, W2, W4, and W5 as the charging power of the battery after being reduced.

In a preferred implementation, the candidate charging power W4 may be used as the charging power of the battery after being reduced, in consideration of the range of the charging power adjustment interval between two adjacent charging powers. In a specific implementation process, if the battery or the environment of the battery changes and some reasons may occur, other candidate charging powers lower than the candidate charging power W4 may also be selected in the candidate set as the charging power of the reduced battery, which is not particularly limited in the embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, as the battery is recycled, the adjustment interval between the candidate charging powers in the charging power candidate set may be set to be gradually decreased, so as to avoid a problem of a large decrease in battery capacity caused by an excessive decrease in the charging power of the battery.

EXAMPLE five

The embodiment of the invention further provides an embodiment of a device for realizing the steps and the method in the embodiment of the method. Fig. 9 is a functional block diagram of a charging device for a battery according to an embodiment of the present invention. As shown in fig. 9, the apparatus includes:

an acquisition unit 91 for acquiring state information of the battery;

a judging unit 92 for judging whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery;

an adjusting unit 93, configured to reduce the charging power of the battery when it is determined that a condition for reducing the charging power of the battery is satisfied;

a charging unit 94 for charging the battery with the reduced charging power;

Specifically, in the embodiment of the present invention, the cycle number of the battery includes at least one of a total cycle number of the battery and a cycle number interval of the battery.

Specifically, in the embodiment of the present invention, the accumulated time of the battery includes at least one of a total accumulated time of the battery and an accumulated time interval of the battery.

Specifically, in the embodiment of the present invention, the capacity state information of the battery includes at least one of the current capacity of the battery and the capacity retention rate of the battery.

Specifically, in the embodiment of the present invention, the energy state information of the battery includes at least one of the current energy of the battery and the energy conservation rate of the battery.

Specifically, in the embodiment of the present invention, the determining unit 92 is specifically configured to:

when the cycle number of the battery is the corresponding number threshold, judging that the condition of reducing the charging power of the battery is satisfied; alternatively, when the number of cycles of the battery is not the corresponding number threshold, the condition for reducing the charging power of the battery is judged to be unsatisfied.

when the accumulated time of the battery is the corresponding time threshold, judging that the condition of reducing the charging power of the battery is satisfied; alternatively, when the accumulated time of the battery is not equal to the corresponding time threshold, it is determined that the condition for reducing the charging power of the battery is not satisfied.

when the capacity state information of the battery is the corresponding capacity threshold value, judging that the condition of reducing the charging power of the battery is satisfied; alternatively, when the capacity state information of the battery is not the corresponding capacity threshold, it is determined that the condition for reducing the charging power of the battery is not satisfied.

when the energy state information of the battery is the corresponding energy threshold value, judging that the condition of reducing the charging power of the battery is satisfied; or, when the energy state information of the battery is not the corresponding energy threshold, the condition for reducing the charging power of the battery is judged to be not satisfied.

Specifically, in the embodiment of the present invention, the adjusting unit 93 is specifically configured to:

adjusting an interval according to preset charging power, and reducing the charging power of the battery; or,

taking one candidate charging power lower than the charging power of the battery in a preset charging power candidate set as the charging power of the reduced battery; wherein the charging power candidate set comprises at least one candidate charging power.

Specifically, in the embodiment of the present invention, the obtaining unit 91 is specifically configured to:

acquiring the number of times of a charging process and a discharging process of the battery as the cycle number of the battery; or,

acquiring the number of the maximum voltage of the battery reaching the upper charging limit voltage and the minimum voltage of the battery reaching the lower discharging limit voltage as the cycle number of the battery; or,

Specifically, in the embodiment of the present invention, the charging unit 94 is specifically configured to:

and charging the battery by adopting a constant power charging mode according to the reduced charging power.

Specifically, in the embodiment of the present invention, the determining unit 92 is further configured to:

determining the number threshold corresponding to the temperature segment as the number threshold of the battery.

and determining the capacity threshold corresponding to the temperature section as the capacity threshold of the battery.

and determining the energy threshold corresponding to the temperature section as the energy threshold of the battery.

Since each unit in the present embodiment can execute the method shown in fig. 1, reference may be made to the related description of fig. 1 for a part of the present embodiment that is not described in detail.

The technical scheme of the embodiment of the invention has the following beneficial effects:

EXAMPLE six

The embodiment of the invention further provides a battery system. Please refer to fig. 10, which is a functional block diagram of a battery system according to an embodiment of the present invention.

As shown in fig. 10, the battery system includes a battery 101 and a charging device 102 for the battery.

Referring to fig. 11, which is a first schematic diagram of a battery system according to an embodiment of the present invention, as shown in fig. 11, the battery system includes a battery, a battery charging device, a temperature sensor, a cycle counter, an ammeter, a voltmeter, a current source, and a voltage source.

Specifically, the schematic diagram of the battery system shown in fig. 11 corresponds to the schematic flow diagram of the second embodiment of the battery charging method shown in fig. 3.

In one specific implementation, as shown in fig. 11, the current meter in the battery system is used for monitoring the charging current of the battery during the charging process, and transmitting the monitoring result to the charging device of the battery in the battery system. The voltmeter in the battery system is used for measuring the voltage at two ends of the battery. And the cycle counter in the battery system is used for receiving the voltage signal transmitted by the voltmeter and acquiring the cycle number of the battery according to the method as the embodiment II. The cycle counter may communicate the number of cycles of the battery to a charging device for the battery. The temperature sensor in the battery system is used for measuring the temperature of the battery. The current source in the battery system is used for providing controllable constant charging current. A voltage source in the battery system for providing a controllable constant charging voltage

It is understood that the connection manner of the current meter, the voltage meter, the temperature sensor, the cycle counter, the current source, the voltage source, the battery and the charging device of the battery in the battery system as shown in fig. 11 is only a specific implementation manner and is not intended to limit the present application.

Referring to fig. 12, which is a second schematic diagram of a battery system according to an embodiment of the present invention, as shown in fig. 12, the battery system includes a battery, a battery charging device, a temperature sensor, a time recorder, an ammeter, a voltmeter, a current source, and a voltage source.

Specifically, the schematic diagram of the battery system shown in fig. 12 corresponds to the schematic flowchart of the third embodiment of the battery charging method shown in fig. 4.

In one specific implementation, as shown in fig. 12, the current meter in the battery system is used for monitoring the charging current of the battery during the charging process, and transmitting the monitoring result to the charging device of the battery in the battery system. The voltmeter in the battery system is used for measuring the voltage at two ends of the battery. The time recorder in the battery system is used for acquiring the accumulated time of the battery according to the method as described in the third embodiment. The temperature sensor in the battery system is used for measuring the temperature of the battery. The current source in the battery system is used for providing controllable constant charging current. A voltage source in the battery system for providing a controllable constant charging voltage

It is understood that the connection manner of the current meter, the voltage meter, the temperature sensor, the time recorder, the current source, the voltage source, the battery and the charging device of the battery in the battery system as shown in fig. 12 is only a specific implementation manner and is not intended to limit the present application.

Referring to fig. 13, which is a third schematic view of a battery system according to an embodiment of the present invention, as shown in fig. 13, the battery system includes a battery, a battery charging device, a temperature sensor, an ammeter, a voltmeter, a capacity obtaining unit, a current source, and a voltage source.

Specifically, the schematic diagram of the battery system shown in fig. 13 corresponds to the schematic flowchart of the fourth embodiment of the battery charging method shown in fig. 5.

In one specific implementation, as shown in fig. 13, the current meter in the battery system is used for monitoring the charging current of the battery during the charging process, and transmitting the monitoring result to the charging device of the battery in the battery system. The voltmeter in the battery system is used for measuring the voltage at two ends of the battery. The temperature sensor in the battery system is used for measuring the temperature of the battery. And a capacity acquisition unit in the battery system, configured to acquire the capacity state information of the battery according to the method described in embodiment two. The current source in the battery system is used for providing controllable constant charging current. The voltage source in the battery system is used for providing a controllable constant charging voltage.

It is understood that, in the battery system shown in fig. 13, the connection manner of the capacity acquisition unit, the current meter, the voltage meter, the temperature sensor, the current source, the voltage source, the battery, and the charging device of the battery is only a specific implementation manner, and is not intended to limit the present application.

Referring to fig. 14, which is a fourth schematic view of a battery system according to an embodiment of the present invention, as shown in fig. 14, the battery system includes a battery, a battery charging device, a temperature sensor, an ammeter, a voltmeter, an energy obtaining unit, a current source, and a voltage source.

Specifically, the schematic diagram of the battery system shown in fig. 14 corresponds to the schematic flow diagram of the fifth embodiment of the battery charging method shown in fig. 6.

In one specific implementation, as shown in fig. 14, the current meter in the battery system is used for monitoring the charging current of the battery during the charging process, and transmitting the monitoring result to the charging device of the battery in the battery system. The voltmeter in the battery system is used for measuring the voltage at two ends of the battery. The temperature sensor in the battery system is used for measuring the temperature of the battery. The energy obtaining unit in the battery system is used for obtaining the energy state information of the battery according to the method described in the third embodiment. The current source in the battery system is used for providing controllable constant charging current. The voltage source in the battery system is used for providing a controllable constant charging voltage.

In another specific implementation, the energy obtaining unit in the battery system shown in fig. 14 may be a charge detector.

It is understood that the connection manner of the energy obtaining unit, the current meter, the voltage meter, the temperature sensor, the current source, the voltage source, the battery and the charging device of the battery in the battery system shown in fig. 14 is only a specific implementation manner and is not intended to limit the present application.

For parts of the present embodiment not described in detail, reference may be made to the description of fig. 1 to 8.

the battery system provided by the embodiment of the invention comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, can represent the use data of the battery by acquiring the recycling number, the accumulated time and the like of the battery, judges whether the preset conditions are met according to the use data, and further determines whether the operation of reducing the charging power of the battery is carried out; when the preset condition is met, the charging power of the battery is properly adjusted, and the battery is charged with the reduced charging power, so that the voltage of the battery is gradually increased in the process of charging the battery, the current of the battery is gradually reduced due to the reduction of the charging power, and the polarization speed of the battery is slowed; therefore, the speed of accumulating byproducts on the anode and the cathode of the battery is slowed down, the damage speed of the crystal form of the cathode material of the battery is slowed down, the oxidation decomposition speed of the electrolyte is slowed down, and the cycle performance of the battery is improved; furthermore, the loss speed of the battery in the cyclic charging process is slowed to a certain extent, and the cycle life of the battery is prolonged.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method of charging a battery, the method comprising:

acquiring state information of a battery;

charging the battery with the reduced charging power;

2. The method of claim 1, wherein the number of cycles of the battery comprises at least one of a total number of cycles of the battery and a cycle number interval of the battery.

3. The method of claim 1, wherein the accumulated time of the battery comprises at least one of a total accumulated time of the battery and an accumulated time interval of the battery.

4. The method of claim 1, wherein the state-of-capacity information of the battery comprises at least one of a current capacity of the battery and a capacity retention rate of the battery.

5. The method of claim 1, wherein the energy status information of the battery comprises at least one of a current energy of the battery and an energy retention rate of the battery.

6. The method according to claim 1 or 2, wherein determining whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery further comprises:

7. The method according to claim 1 or 3, wherein determining whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery further comprises:

8. The method according to claim 1 or 4, wherein determining whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery comprises:

9. The method according to claim 1 or 5, wherein determining whether a condition for reducing the charging power of the battery is satisfied according to the state information of the battery further comprises:

10. The method of claim 1, wherein reducing the charging power of the battery comprises:

11. The method according to claim 1 or 2, wherein if the status information of the battery is the cycle number, acquiring the status information of the battery comprises:

12. The method of claim 1, wherein charging the battery at the reduced charging power comprises:

13. The method of claim 6, wherein prior to comparing the number of cycles of the battery to a corresponding number threshold, the method further comprises:

14. The method of claim 7, wherein prior to comparing the accumulated time of the battery to the corresponding time threshold, the method further comprises:

15. The method of claim 8, wherein prior to comparing the capacity status information of the battery to the corresponding capacity threshold, the method further comprises:

16. The method of claim 9, wherein prior to comparing the energy state information of the battery to the corresponding energy threshold, the method further comprises:

17. A charging device for a battery, the device comprising:

an acquisition unit configured to acquire state information of a battery;

a charging unit for charging the battery with the reduced charging power;

18. The apparatus of claim 17, wherein the number of cycles of the battery comprises at least one of a total number of cycles of the battery and a cycle number interval of the battery.

19. The apparatus of claim 17, wherein the accumulated time of the battery comprises at least one of a total accumulated time of the battery and an accumulated time interval of the battery.

20. The apparatus of claim 17, wherein the capacity status information of the battery comprises at least one of a current capacity of the battery and a capacity retention rate of the battery.

21. The apparatus of claim 17, wherein the energy status information of the battery comprises at least one of a current energy of the battery and an energy retention rate of the battery.

22. The apparatus according to claim 17 or 18, wherein the determining unit is specifically configured to:

23. The apparatus according to claim 17 or 19, wherein the determining unit is specifically configured to:

24. The apparatus according to claim 17 or 20, wherein the determining unit is specifically configured to:

25. The apparatus according to claim 17 or 21, wherein the determining unit is specifically configured to:

26. The apparatus according to claim 17, wherein the adjusting unit is specifically configured to:

27. The apparatus according to claim 17 or 18, wherein if the status information of the battery is the cycle number, the obtaining unit is specifically configured to:

28. The apparatus according to claim 17, wherein the charging unit is specifically configured to:

29. The apparatus of claim 22, wherein the determining unit is further configured to:

30. The apparatus of claim 23, wherein the determining unit is further configured to:

31. The apparatus of claim 24, wherein the determining unit is further configured to:

32. The apparatus of claim 25, wherein the determining unit is further configured to:

33. A battery system, characterized in that the battery system comprises a battery and a charging device for the battery according to any one of claims 17 to 32.