CN118554042A

CN118554042A - Battery charging method, storage medium and electronic device

Info

Publication number: CN118554042A
Application number: CN202310164883.9A
Authority: CN
Inventors: 韩承均; 吴桂森; 李伟
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2024-08-27

Abstract

The embodiment of the invention provides a battery charging method, a storage medium and an electronic device, wherein in a first stage of charging, a first charging multiplying power is used for charging, and in a second stage of charging, a second charging multiplying power is used for charging, wherein the first charging multiplying power is a numerical value in a first charging multiplying power range, the second charging multiplying power is a numerical value in a second charging multiplying power range, and the first charging multiplying power is smaller than an initial second charging multiplying power, so that the problem of reduced battery life caused by using a constant high charging multiplying power can be solved, the technical effects of improving the electrolyte soaking effect of a battery in a charging process and maintaining the service life of the battery are achieved.

Description

Battery charging method, storage medium and electronic device

Technical Field

The embodiment of the invention relates to the technical field of battery charging, in particular to a battery charging method, a storage medium and an electronic device.

Background

How to quickly complete charging is an important research content in the field of battery technology. If the battery is charged with a high charge rate (corresponding to a relatively large charge current) during the entire charging process, the charging time can be effectively shortened, but a series of problems such as battery heating and performance degradation may be brought about, resulting in a reduction in the cycle life of the battery. It can be seen that simply charging with a high charging rate is not very efficient and reliable, and that there is a need to provide a reasonable charging strategy to balance the dual requirements of charging time and battery performance.

Disclosure of Invention

The embodiment of the invention provides a battery charging method, a storage medium and an electronic device, which are used for at least solving the problem of reduced service life of a battery caused by using high charging multiplying power in the related art.

According to an embodiment of the present invention, there is provided a battery charging method including:

In the first stage of charging, a first charging rate is used for charging, and in the second stage of charging, a second charging rate is used for charging, wherein the first charging rate is a numerical value in a first charging rate range, the second charging rate is a numerical value in a second charging rate range, and the first charging rate is smaller than the initial second charging rate.

In an exemplary embodiment, the first phase of charging refers to a phase of the battery in a first SOC value interval, and the second phase refers to a phase of the battery in a second SOC value interval, where the first SOC value interval is a continuous interval of [ a, B ], the value of a is not less than 0, the value of B is not less than 1, and the second SOC value interval is a continuous interval of [ B, C ], where B is not less than a, C is not less than B.

In an exemplary embodiment, the first phase of charging refers to a phase of the battery during a first charging time interval, and the second phase of charging refers to a phase of the battery during a second charging time interval, wherein the first charging time interval is a continuous interval of [ a, b ] minutes, the value of a is not less than 0, the value of b is not less than 8, and the second charging time interval is a continuous interval of [ b, c ] minutes, wherein b is not less than a, c is not less than b.

In one exemplary embodiment, the first charge rate of the first stage of charging is a constant value or a stepwise rise.

In one exemplary embodiment, the second charge rate of the second phase of charging is a constant value or a step down.

In one exemplary embodiment, the value range of B [0.20,0.25], and the value range of C [0.45,0.55].

In one exemplary embodiment, the range of values for b is [8,60], and the range of values for c is [21,90].

In one exemplary embodiment, the first charge rate range is [0.1,1.5]; and/or, the second charging rate range is [1.0,3].

In one exemplary embodiment, the initial first charge rate is determined by a rate of battery expansion force increase.

In one exemplary embodiment, the initial charge rate of the first charge rate is decreased according to an increase in the number of battery cycles.

In an exemplary embodiment, the last first charge rate is less than or equal to the initial second charge rate, the last first charge rate being the first charge rate when the first SOC value is B, or the first charge rate when the first charge time is B.

In still another embodiment of the present invention, there is provided a battery charging apparatus mounted to an electric vehicle, the battery charging apparatus including: the acquisition module acquires the battery charging stage information; the control module distributes a charging strategy according to the battery charging stage information, wherein the charging strategy is as follows: in the first stage of charging, a first charging rate is used for charging, and in the second stage of charging, a second charging rate is used for charging, wherein the first charging rate is a numerical value in a first charging rate range, the second charging rate is a numerical value in a second charging rate range, and the first charging rate is smaller than the initial second charging rate.

In another embodiment of the present invention, a battery charging device is provided, and a control module in the battery charging device is configured to allocate a charging policy according to the battery charging stage information, where the charging policy further includes:

The first stage of charging refers to a stage of the battery in a first SOC value interval, and the second stage refers to a stage of the battery in a second SOC value interval, wherein the first SOC value interval is a continuous interval of [ A, B ], the value of A is not less than 0, the value of B is not less than 1, and the second SOC value interval is a continuous interval of [ B, C ], wherein B is not less than A, C is not less than B;

And/or the number of the groups of groups,

The first stage of charging refers to a stage of the battery in a first charging time interval, and the second stage of charging refers to a stage of the battery in a second charging time interval, wherein the first charging time interval is a continuous interval of [ a, b ] minutes, the value of a is not less than 0, the value of b is not less than 8, and the second charging time interval is a continuous interval of [ b, c ] minutes, wherein b is not less than a, and c is not less than b;

And/or the number of the groups of groups,

The first charging multiplying power of the first stage of charging is in a constant value or rises in a step;

And/or the number of the groups of groups,

The second charging rate of the second stage of charging takes a constant value or decreases stepwise;

And/or the number of the groups of groups,

The value range of B is [0.20,0.25], and the value range of C is [0.45,0.55];

And/or the number of the groups of groups,

The value range of b is [8,60], and the value range of c is [21,90];

And/or the number of the groups of groups,

The first charging rate range is [0.1,1.5];

And/or the number of the groups of groups,

The second charging rate range is [1.0,3];

And/or the number of the groups of groups,

The initial first charge rate is determined by the rate of increase of the battery expansion force;

And/or the number of the groups of groups,

The initial charge rate of the first charge rate decreases according to an increase in the number of battery cycles.

According to a further embodiment of the invention, there is also provided a computer readable storage medium having stored therein a computer program, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.

According to a further embodiment of the invention, there is also provided an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.

According to the embodiment of the application, different charging multiplying powers are selected at different stages in the battery charging process, so that the battery expansion force increasing rate in the charging process can be controlled under the preset condition, the problem of reduced service life of the battery caused by constant high charging multiplying power can be solved, the technical effects of improving the electrolyte soaking effect of the battery in the charging process and maintaining the service life of the battery are achieved.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Fig. 1 is a flowchart of a battery charging method according to an embodiment of the present invention;

FIG. 2 is a graph showing the trend of battery expansion force during charging under a conventional fast charge strategy;

Fig. 3 is a block diagram of a battery device according to an embodiment of the present invention;

fig. 4 is a charge rate selection diagram of an exemplary charging method according to an embodiment of the present invention;

Fig. 5 is a second charge rate selection schematic diagram of an exemplary charging method according to an embodiment of the present invention;

Fig. 6 is a charge rate selection schematic diagram three of an exemplary charging method according to an embodiment of the present invention;

Fig. 7 is a graph showing a change in battery expansion force according to an exemplary charging method according to an embodiment of the present invention;

fig. 8 is a graph of battery life trend under an exemplary charging method according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with the embodiments.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The method embodiment provided by the embodiment of the application can be executed in some devices such as a charging pile, a charger and the like. Taking the example of running on the charging post, the charging post can be provided with necessary charging circuits, the circuits can be controlled by a control chip, and the control chip can control a charging method by executing a program. The power receiving side is also required to have a corresponding power receiving circuit and a power receiving control chip to cooperate with the charging side to execute the charging method if necessary.

Some technical terms that are required for the present application are explained below:

Battery charge-discharge rate: the charge-discharge rate of the battery determines how fast a certain amount of energy can be stored in the battery or how fast the energy in the battery can be released. The rate of charge and discharge (C-rate) of a battery is commonly measured. Charging at 1C means that the battery can be charged from 0% to 100% of the charge within 1 hour, and discharging at 1C means that the battery can be discharged from 100% to 0% of the charge within 1 hour. Charging at 2C means that the battery can be charged from 0% to 100% in 0.5 hours, and discharging at 2C means that the battery can be discharged from 100% to 0% in 0.5 hours. By definition, the charge-discharge rate is equal in value to the charge-discharge current/rated capacity, c=i/Q. The unit of current I is ampere (a) and the unit of capacity Q is ampere-hour (Ah). A battery of, for example, 10Ah is discharged with 10A, and its discharge rate is 1C. Similarly, if the 10Ah battery is discharged with 20A, the capacity for 2 hours is discharged, which is called 0.5C discharge. Multiplying the numerator and denominator of the above formula c=i/Q simultaneously by the rated voltage, then c=ui/uq=p/E in value, i.e., c=power/energy (energy). (the unit of power is watt W and the unit of energy is watt hour Wh). Typically, when referring to the scale of an energy storage system, this is referred to as "power/energy" in this manner, for example, 1MW/2MWh for a particular energy storage plant. Here, 1MW means charge-discharge power, and 2MWh means energy of a power station. It can be seen that if the discharge is performed at a rated power of 1MW, the power of the power station is discharged for 2 hours, which is configured to 0.5C. The corresponding relation between C and the battery charge and discharge time is the reciprocal relation.

State of Charge (SOC for short): i.e., state of charge, is used to reflect the remaining capacity of the battery, and is defined numerically as the ratio of the remaining capacity to the battery capacity, commonly expressed as a percentage. The value range is 0-1, and the battery is completely discharged when soc=0 and completely full when soc=1. To date, various methods for estimating the SOC have been developed in the battery technology development, including the traditional current integration method, the internal resistance method of the battery, the discharge test method, the open-circuit voltage method, the load voltage method, and the relatively innovative Kalman filtering method, the fuzzy logic theory method, the neural network method, and the like.

The applicant found that in the charging process of the battery, at a stage where the SOC is relatively low or the charging time is early, if the charging is performed at a larger charging rate, the charging time becomes short and the particles of the material inside the battery expand rapidly; at a stage where the SOC is relatively moderate or the charging time is in the middle, the expansion rate of the internal materials of the battery is reduced again; the battery expansion force increase rate rapidly increases again at a stage where the SOC is relatively high or at a late charge. The rapid increase in the uneven increase of the expansion force increase rate of the battery can squeeze out the electrolyte, affect the reflux rate of the electrolyte, and lead to insufficient infiltration and a diving failure mode.

As shown in fig. 1, according to an embodiment of the present invention, there is provided a battery charging method including:

s11, in a first stage of charging, charging is performed by using a first charging rate;

And S12, in the second stage of charging, charging by using a second charging rate, wherein the first charging rate is a value in a first charging rate range, the second charging rate is a value in a second charging rate range, and the first charging rate is smaller than the initial second charging rate.

It should be noted that, in an exemplary embodiment, the first stage or the second stage may be any one stage during the charging process (i.e., during the battery SOC from 0% to 100%). The initial second charging magnification refers to a charging magnification employed at the beginning of the second stage of charging. The "first charging magnification" and "second charging magnification" in the present embodiment refer to a designation of the charging magnification used in the corresponding first stage and second stage.

In an exemplary embodiment, the first phase of charging refers to a phase of the battery in a first SOC value interval, and the second phase refers to a phase of the battery in a second SOC value interval, where the first SOC value interval is a continuous interval of [ a, B ], the value of a is not less than 0, the value of B is not less than 1, and the second SOC value interval is a continuous interval of [ B, C ], where B is not less than a, C is not less than B. As shown in fig. 2, the Y axis is monitoring of the expansion force of the battery, the X axis is the SOC change, and under the conventional charging strategy, the slope is relatively large in the low SOC stage (0% -25% SOC), the slope is reduced in the middle SOC stage (25% -50%), and the expansion force of the battery increases at a high rate in the low SOC stage, which can cause extrusion of the electrolyte, affect the reflux speed of the electrolyte, cause insufficient infiltration of the electrolyte to jump to fail, and reduce the life of the battery cell. When the SOC is in a lower stage, such as the SOC is in the [ A, B ] interval, a lower charging multiplying power, namely a first charging multiplying power, is used, so that the expansion force increasing rate of the battery is reduced, the charging time is prolonged, and the soaking time of electrolyte in a larger gap is increased. When the SOC is in the [ B, C ] interval, the battery expansion force is slowly increased, the charging multiplying power is properly increased, and the second charging multiplying power is used for solving the problem that the charging time of the SOC in the [ A, B ] interval is long.

In one exemplary embodiment, the value range of B [0.20,0.25], and the value range of C [0.45,0.55]. For example, B may be 0.20, 0.21, 0.22, 0.23, 0.24, 0.25; c may be 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55. When the SOC is in a lower stage, for example, the SOC is in the [ A, B ] interval, the value of B is in the [0.20,0.25], if the excessive charging multiplying power is used, the expansion force of the battery can be increased too fast, the electrolyte can not flow back in time under the influence of the expansion force, and the battery core can jump. Therefore, when the SOC is in the [ A, B ] interval, a lower charging multiplying power, namely a first charging multiplying power, is used, so that the expansion force increasing rate of the battery is reduced, the charging time is prolonged, and the soaking time of the electrolyte in a larger gap is increased. When the SOC is in the [ B, C ] interval, the value of C is in the [0.45,0.55], the expansion force of the battery is slowly increased, the charging multiplying power is properly increased, and the second charging multiplying power is used for solving the problem that the charging time of the SOC in the [ A, B ] interval is long.

In an exemplary embodiment, the first phase of charging refers to a phase of the battery during a first charging time interval, and the second phase of charging refers to a phase of the battery during a second charging time interval, wherein the first charging time interval is a continuous interval of [ a, b ] minutes, a is not less than 0, b is not less than 8, and the second charging time interval is a continuous interval of [ b, c ] minutes, wherein b is not less than a, c is not less than b. When the charging time is in an early stage, for example, when the charging time is in a continuous interval of [ a, b ] minutes, if an excessive charging rate is used, the expansion force of the battery can be increased too quickly, the electrolyte cannot flow back in time under the influence of the expansion force, and the battery core can jump. Therefore, when the charging time is in the continuous interval of [ a, b ] minutes, the lower charging multiplying power, namely the first charging multiplying power, is used, the expansion force increasing rate of the battery is reduced, the charging time is prolonged, and the soaking time of the electrolyte in a larger gap is increased. The second charge rate is used by appropriately increasing the charge rate in the stage of slow increase of the battery expansion force, that is, when the charge time is in the continuous section of [ b, c ] minutes. Typically, the battery is charged at a charge rate of 1C, and can be charged from 0% to 100% in1 hour, and from 0% to 20% in 8 minutes if charged at a charge rate of 1.5C.

In one exemplary embodiment, the first charge rate of the first stage of charging is a constant value or stepped up. The first stage of charging the battery using a first charging rate includes:

in the first stage of battery charging, charging is carried out by using the same first charging multiplying power; or alternatively

In a first stage of charging the battery, charging is performed in different subintervals of the first stage by using first charging multiplying powers corresponding to the subintervals respectively, wherein one subinterval corresponds to one first charging multiplying power; or alternatively

In the first stage of the battery charging, as the SOC value continuously increases, the charging is performed using the continuously increasing first charging rate.

In one exemplary embodiment, the second charge rate of the second stage of charging is at a constant value or decreases stepwise. The charging using the second charging rate in the second phase of the battery charging includes:

In the second stage of battery charging, charging is carried out by using the same second charging multiplying power; or alternatively

In a second stage of the battery charging, charging the different subintervals of the second stage by using second charging multiplying powers corresponding to the subintervals respectively, wherein one subinterval corresponds to one second charging multiplying power; or alternatively

In the second phase of battery charging, as the SOC value continuously increases, charging is performed using a continuously decreasing second charging rate.

That is, in the divided charging phases, the charging magnification may be continuously changed, such as continuously straight-line rising or straight-line falling, or continuously curve rising or continuously curve falling; but also can be stepped, such as stepped up or stepped down; or may be a steady constant value.

In one exemplary embodiment, the range of values for b is [8,60], and the range of values for c is [21,90]. When the charging time is in an early stage, for example, the charging time is in a continuous interval of [ a, b ] minutes, the value of b is [8,60], if an excessive charging multiplying power is used, the expansion force of the battery can be increased too fast, the electrolyte cannot flow back in time under the influence of the expansion force of the battery, and the battery core can jump. Therefore, when the charging time is in the continuous interval of [ a, b ] minutes, the lower charging multiplying power, namely the first charging multiplying power, is used, the expansion force increasing rate of the battery is reduced, the charging time is prolonged, and the soaking time of the electrolyte in a larger gap is increased. And in the stage of slowly increasing the expansion force of the battery, namely when the charging time is in the continuous interval of [ b, c ] minutes, the value of c is [21,90], the charging multiplying power is properly increased, and the second charging multiplying power is used.

In one exemplary embodiment, the first charge rate range is [0.1,1.5]; and/or the second charging rate range is [1.0,3]. And the battery charging strategy is adjusted by monitoring the change of the expansion force of the battery, the battery charging multiplying power is adjusted, the electrolyte infiltration effect of the battery is improved, and the service life of the battery is prolonged.

In one exemplary embodiment, the initial first charge rate is determined by the battery expansion rate. Or in an exemplary embodiment, an initial SOC of the current battery that starts charging is obtained (for example, charging may be started from SOC of 0, the initial SOC is 0, or charging may be started from SOC of 0.1, the initial SOC is 0.1), and an initial charging rate corresponding to the initial SOC is determined according to the initial SOC, where a preset correspondence relationship exists between the initial SOC of charging the battery and the initial charging rate, and when the initial charging rate is determined, the SOC of the current battery is obtained, and then the initial charging rate is determined according to the SOC of the current battery and the preset relationship. For example, assuming that the initial SOC is 0.1 (charging is started from the time when the SOC is 0.1), assuming that the first stage is a continuous section of SOC of [0,0.2], it is assumed that the initial SOC is located in the first stage, the SOC is charged to the battery using a value within the first charging rate range corresponding to the first stage in the process of [0.1,0.2], and assuming that the initial charging rate corresponding to the preset correspondence setting charging initial SOC is 0.1 is 0.5, it is assumed that the initial charging rate used at the initial stage is 0.5.

In one exemplary embodiment, the initial first charge rate decreases according to an increase in the number of battery cycles. With the increase of the cycle times of the battery, the service life of the battery is reduced, the expansion force of the battery is increased, and in order to solve the problem that electrolyte cannot flow back in time caused by the increase of the expansion force of the battery, the initial first charging multiplying power is properly reduced, and the expansion force increasing rate of the battery is reduced.

In one exemplary embodiment, the last first charge rate is less than or equal to the initial second charge rate, the last first charge rate being the first charge rate when the first SOC value is B, or the first charge rate when the first charge time is B. The first SOC interval and the second SOC interval are two continuous intervals connected, and the first charge time interval and the second charge time interval are two continuous intervals connected, and the last first charge rate may be equal to the initial second charge rate, but may also be smaller than the initial second charge rate. The lower first charging rate is used in the first stage of charging, so that the charging time of the first stage is overlong, and the higher second charging rate is used in the second stage, so that the problem of overlong charging time of the first stage is solved, and the time for fully charging the battery is kept unchanged or prolonged too much.

The embodiment of the application also provides a battery charging device assembled in the electric automobile, and the device is used for realizing the above embodiment and the preferred implementation mode, and is not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated. As shown in fig. 3, the apparatus includes: s31, an acquisition module acquires the battery charging stage information; s32, the control module distributes a charging strategy according to the battery charging stage information, wherein the charging strategy is as follows: in the first stage of charging, a first charging rate is used for charging, and in the second stage of charging, a second charging rate is used for charging, wherein the first charging rate is a numerical value in a first charging rate range, the second charging rate is a numerical value in a second charging rate range, and the first charging rate is smaller than the initial second charging rate.

In yet another embodiment of the present invention, a battery charging device is provided, which is assembled in an electric vehicle, and the control module S32 in the battery charging device distributes a charging policy according to the battery charging stage information, where the charging policy further includes:

And/or the number of the groups of groups,

The value range of B is [0.20,0.25], and the value range of C is [0.45,0.55];

And/or the number of the groups of groups,

The value range of b is [8,60], and the value range of c is [21,90];

And/or the number of the groups of groups,

The first charging rate range is [0.1,1.5];

And/or the number of the groups of groups,

The second charging rate range is [1.0,3];

And/or the number of the groups of groups,

According to the embodiment of the application, different charging multiplying powers are selected at different stages in the battery charging process, so that the expansion rate of the battery pole piece in the charging process is controlled under the preset condition, the problem of reduced service life of the battery caused by constant high charging multiplying power can be solved, the technical effects of improving the wetting effect of the battery electrolyte in the charging process and maintaining the service life of the battery are achieved. In the stage of rapid expansion of the material, the charging multiplying power is reduced, so that the expansion rate of the battery cell pole piece is reduced, and the charging time is prolonged. Electrolyte infiltration time is increased when a larger gap is formed, charging rate is properly increased in a slow expansion stage of the material, and the problem of long charging time of low SOC is solved; in the high SOC phase, the charging current is gradually reduced.

In addition, the change rate of the expansion force of the battery in the charging process of the battery can be improved, so that the damage of the embedded lithium of the material can be optimized, the problem that the service life is influenced due to the fact that the lithium consumption is increased as the surface of the material expands too much and the problem that the ack condition occurs can be solved. Wherein, the ack refers to: particle breakage, graphite breakage, resulting in exposure of fresh graphite, formation of a new SEI film, and consumption of more electrolyte and additives.

In addition, the SEI film formed under low charging multiplying power is more compact, and the cycling stability can be improved.

The present embodiment is further illustrated by the following examples:

Fig. 4 is a charge rate selection diagram of an exemplary charging method according to an embodiment of the present invention; fig. 5 is a second charge rate selection schematic diagram of an exemplary charging method according to an embodiment of the present invention; fig. 6 is a charge rate selection schematic diagram three of an exemplary charging method according to an embodiment of the present invention; fig. 7 is a graph showing a change in battery expansion force according to an exemplary charging method according to an embodiment of the present invention; fig. 8 is a graph of battery life trend under an exemplary charging method according to an embodiment of the present invention.

As shown in fig. 4, in the charging strategy provided in this embodiment, in the low SOC stage (corresponding to the first SOC value interval in the above embodiment, for example, 0% -25% SOC), the charging rate is gradually increased from a lower value, the overall level is kept at a low level, the expansion rate of the battery is reduced, the charging time is prolonged, and the electrolyte soaking time is increased when the gap is increased (the electrolyte soaking time between the electrode plates is faster when the battery is just charged, if the particles expand rapidly, the electrolyte reflux rate is seriously affected, the rate is reduced (i.e. the charging is performed by using the lower charging rate), which is actually the expansion rate is reduced, and the electrolyte reflux time is prolonged. In the slow-expansion phase (i.e., the middle SOC phase, corresponding to the second SOC value interval in the above embodiment, for example, 25-50%) of the material expansion, the charging is performed with a higher charging rate, and the average charging rate is appropriately increased compared with the low SOC phase (generally determined according to the charging capacity and the lithium precipitation window, generally 10% increase in conventional graphite and 20% increase in coated fast-charge graphite), so that the charging rate is appropriately increased, the problem of long charging time of the low SOC is solved, and the charging rate is gradually decreased after the charging rate is greater than 50% SOC (corresponding to the third SOC value interval in the above embodiment).

As shown in fig. 5, in the low SOC stage (e.g., 0% -25% SOC), charging may also be performed using a constant low charge rate, which may be lower than that in the medium SOC stage. In other SOC phases, charging may be performed using a stepwise varying charging rate.

As shown in fig. 6, the charging mode in the low SOC stage may be a mode in which the current gradually increases; the charging mode at the high SOC stage may be a mode in which the current gradually decreases.

As shown in fig. 7, the gray curve represents the battery expansion force variation curve under the improved fast charge strategy of the present application, the black curve represents the battery expansion force variation curve under the conventional fast charge strategy, it can be seen that the battery expansion force variation of the improved fast charge strategy of the present application is uniform with the increase of the Cycle number (Cycle), the battery expansion force variation under the conventional fast charge strategy is faster and faster, and the battery expansion force of the improved charge strategy of the present application is substantially lower than the battery expansion force under the conventional fast charge strategy.

As shown in fig. 8, the gray curve represents the battery life (SOH) change curve under the present application fast charge strategy, the black curve represents the battery life (SOH) change curve under the conventional fast charge strategy, it can be seen that the battery life (SOH) decrease rate of the present application improved fast charge strategy is slower than the battery life (SOH) decrease rate under the conventional fast charge strategy with the increase of the Cycle number (Cycle), and the battery life of the present application improved fast charge strategy is longer than the battery life under the conventional fast charge strategy.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal device to perform the method according to the embodiments of the present invention.

Embodiments of the present invention also provide a computer readable storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.

In one exemplary embodiment, the computer readable storage medium may include, but is not limited to: a usb disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing a computer program.

An embodiment of the invention also provides an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.

In an exemplary embodiment, the electronic apparatus may further include a transmission device connected to the processor, and an input/output device connected to the processor.

Specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the exemplary implementation, and this embodiment is not described herein.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery charging method, comprising:

2. The method of claim 1, wherein the first phase of charging refers to a phase of the battery in a first SOC value interval, and the second phase refers to a phase of the battery in a second SOC value interval, wherein the first SOC value interval is a continuous interval of [ a, B ], a is not less than 0, B is not less than 1, and the second SOC value interval is a continuous interval of [ B, C ], wherein B is not less than a, C is not less than B.

3. The method of claim 1, wherein the first phase of charging refers to a phase of the battery during a first charging time interval, and the second phase of charging refers to a phase of the battery during a second charging time interval, wherein the first charging time interval is a continuous interval of [ a, b ] minutes, a is not less than 0, b is not less than 8, and the second charging time interval is a continuous interval of [ b, c ] minutes, wherein b is not less than a, c is not less than b.

4. A method according to claim 1, 2 or 3, wherein the first charge rate of the first stage of charging is at a constant value or is stepped up.

5. A method according to claim 1, 2 or 3, wherein the second charging rate of the second phase of charging is at a constant value or is stepped down.

6. The method of claim 2, wherein B is in the range [0.20,0.25] and C is in the range [0.45,0.55].

7. The method of claim 2, wherein the range of values for b is [8,60], and the range of values for c is [21,90].

8. The method of claim 1, wherein the first charge rate range is [0.1,1.5]; and/or, the second charging rate range is [1.0,3].

9. The method of claim 1, wherein the initial first charge rate is determined by a rate of increase of the battery expansion force.

10. The method of claim 1, wherein the initial charge rate of the first charge rate decreases in response to an increase in the number of battery cycles.

11. A battery charging apparatus assembled in an electric vehicle, comprising:

the acquisition module acquires the battery charging stage information;

The control module distributes a charging strategy according to the battery charging stage information, wherein the charging strategy is as follows: in the first stage of charging, a first charging rate is used for charging, and in the second stage of charging, a second charging rate is used for charging, wherein the first charging rate is a numerical value in a first charging rate range, the second charging rate is a numerical value in a second charging rate range, and the first charging rate is smaller than the initial second charging rate.

12. The battery charging apparatus of claim 11, wherein the charging strategy assigned by the control apparatus further comprises:

And/or the number of the groups of groups,

The value range of B is [0.20,0.25], and the value range of C is [0.45,0.55];

And/or the number of the groups of groups,

The value range of b is [8,60], and the value range of c is [21,90];

And/or the number of the groups of groups,

The first charging rate range is [0.1,1.5];

And/or the number of the groups of groups,

The second charging rate range is [1.0,3];

And/or the number of the groups of groups,

The initial first charge rate is determined by the battery expansion rate;

And/or the number of the groups of groups,

13. A computer readable storage medium, characterized in that a computer program is stored in the computer readable storage medium, wherein the computer program, when being executed by a processor, implements the steps of the method according to any of the claims 1 to 10.

14. An electronic device comprising a memory, a processor, wherein the memory stores a computer program executable on the processor, characterized in that the processor implements the steps of the method of any of claims 1 to 10 when the computer program is executed.