CN110954833B - Method and device for acquiring battery capacity and vehicle - Google Patents
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- CN110954833B CN110954833B CN201811115253.8A CN201811115253A CN110954833B CN 110954833 B CN110954833 B CN 110954833B CN 201811115253 A CN201811115253 A CN 201811115253A CN 110954833 B CN110954833 B CN 110954833B
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Abstract
The invention provides a method for acquiring battery capacity, which comprises the following steps: when the battery continuous standing time is detected to be greater than or equal to the preset threshold time, acquiring a first SOC of the state of charge of the battery, and recording the time of acquiring the first SOC as a first time; after the first moment, detecting that the battery has a charging action or a discharging action, and judging whether the battery is in a fully charged or empty state; if the battery is in a fully charged or discharged state, recording the time when the battery is fully charged or discharged as a second time, and acquiring a first electric charge accumulated or released by the battery from the first time to the second time; and acquiring the capacity of the battery according to the first SOC, the first charge quantity and the state of full charge or empty charge of the battery. The method for acquiring the battery capacity is convenient for acquiring the battery capacity in the daily use process of the battery. The invention also provides a device for acquiring the battery capacity, a vehicle and a non-transitory computer readable storage medium.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method for obtaining battery capacity, an apparatus for obtaining battery capacity, a vehicle, and a non-transitory computer-readable storage medium.
Background
The battery is worn out during the use process, that is, the maximum value of the actual capacity is gradually reduced along with the use of the battery, so that the actual capacity of the battery needs to be acquired again during the use process of the battery. The prior art generally adopts the steps of charging a battery to the highest voltage and then discharging the battery to the cut-off voltage, and determining the current capacity of the battery according to the electric quantity in the process of discharging the battery from the highest voltage to the cut-off voltage. However, in the daily use of the battery, there is a rare case that the battery is discharged after being fully charged, and the above method of obtaining the capacity of the battery is inconvenient to obtain the capacity of the battery in the daily use of the battery.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, a first objective of the present invention is to provide a method for acquiring battery capacity, by acquiring a first SOC of a battery when it is detected that a battery continuously stands for a time greater than or equal to a preset threshold time; the method and the device have the advantages that the fact that the battery has charging action or discharging action and is in a fully charged or discharged state is detected, the first charge quantity accumulated or released from the first SOC to the time when the battery is fully charged or discharged is obtained to obtain the capacity of the battery, the actual capacity of the battery can be obtained when the fully charged or discharged state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily using process of the battery.
A second object of the present invention is to provide a device for obtaining battery capacity.
A third object of the invention is to propose a vehicle.
A fourth object of the invention is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for obtaining battery capacity, including the steps of: detecting whether the continuous standing time of the battery is greater than or equal to a preset threshold time or not; when the battery continuous standing time is detected to be greater than or equal to the preset threshold time, acquiring a first SOC of the state of charge of the battery, and recording the time of acquiring the first SOC as a first time; after the first moment, if the battery is detected to have a charging action or a discharging action, judging whether the battery is in a fully charged or discharged state; if the battery is in a fully charged or discharged state, recording the time when the battery is fully charged or discharged as a second time, and acquiring a first charge amount accumulated or released by the battery from the first time to the second time, wherein the first charge amount is not 0; and acquiring the capacity of the battery according to the first SOC, the first charge amount and the state of full charge or empty charge of the battery.
According to the method for acquiring the battery capacity, when the battery continuous standing time is detected to be greater than or equal to the preset threshold time, the first SOC of the state of charge of the battery is acquired; the method and the device have the advantages that the battery is detected to have charging action or discharging action and is in a full-charge or empty-charge state, the first charge quantity accumulated or released from the first SOC to the full-charge or empty-charge state of the battery is obtained to obtain the capacity of the battery, the situation that the capacity of the battery can be obtained only when the battery is fully charged and then the battery is empty-charge can be avoided, the actual capacity of the battery can be obtained when one of the full-charge or empty-charge state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily use process of the battery.
In some embodiments, said obtaining a first state of charge SOC of said battery comprises the steps of: acquiring the temperature and the open-circuit voltage OCV of the battery; and acquiring the first SOC according to the SOC-OCV curve of the battery.
In some embodiments, the step of obtaining the capacity of the battery according to the first SOC, the first charge amount, and the state of the battery being fully charged or discharged comprises: if the battery is in a fully charged state, the capacity C of the battery is as follows: c ═ Q1/(1-SOC 1); if the battery is in an empty state, the capacity C of the battery is as follows: c is Q1/SOC 1; wherein Q1 is the first charge amount and SOC1 is the first SOC.
In some embodiments, the method of obtaining battery capacity further comprises the steps of: if the battery is in a state of not fully charged and not discharged, detecting whether the time for the battery to continuously stand is greater than or equal to the preset threshold time; when the time that the battery continuously stands is detected to be greater than or equal to the preset threshold time, acquiring the temperature and the open-circuit voltage OCV of the battery, acquiring a second SOC of the battery according to the SOC-OCV curve of the battery, and recording the time of acquiring the second SOC as a third time; acquiring a second charge amount accumulated or released by the battery from the first moment to the third moment, wherein the second charge amount is not 0; and acquiring the capacity of the battery according to the first SOC, the second SOC and the second charge amount.
In some embodiments, the step of obtaining the capacity C of the battery according to the first SOC, the second SOC, and the second charge amount includes: c ═ Q2/(SOC2-SOC1), where Q2 is the second charge amount and SOC2 is the second SOC.
In some embodiments, the first amount of charge and the second amount of charge are obtained by a current integration method.
In some embodiments, determining whether the battery is in a fully charged or discharged state comprises: judging whether the highest single battery voltage of the battery reaches the upper limit voltage, if so, judging that the battery is in a fully charged state; and judging whether the lowest single battery voltage of the battery reaches the lower limit voltage, if so, judging that the battery is in a discharged power state.
An embodiment of the second aspect of the present invention provides an apparatus for acquiring battery capacity, including: the detection module is used for detecting whether the continuous standing time of the battery is greater than or equal to a preset threshold time or not; the first processing module is used for acquiring a first SOC (state of charge) of the battery when the battery continuous standing time is detected to be greater than or equal to a preset threshold time, and recording the time of acquiring the first SOC as a first time; the judging module is used for judging whether the battery is in a fully charged state or an empty state after detecting that the battery has a charging action or a discharging action after the first moment; the second processing module is used for recording the moment when the battery is fully charged or discharged as a second moment when the battery is fully charged or discharged, and acquiring a first electric charge amount accumulated or released by the battery from the first moment to the second moment, wherein the first electric charge amount is not 0; and the third processing module is used for acquiring the capacity of the battery according to the first SOC, the first charge amount and the state of full charge or empty charge of the battery.
According to the device for acquiring the battery capacity, disclosed by the embodiment of the invention, when the continuous standing time of the battery is detected to be greater than or equal to the preset threshold time, the first SOC of the state of charge of the battery is acquired; the method and the device have the advantages that the battery is detected to have charging action or discharging action and is in a full-charge or empty-charge state, the first charge quantity accumulated or released from the first SOC to the full-charge or empty-charge state of the battery is obtained to obtain the capacity of the battery, the situation that the capacity of the battery can be obtained only when the battery is fully charged and then the battery is empty-charge can be avoided, the actual capacity of the battery can be obtained when one of the full-charge or empty-charge state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily use process of the battery.
An embodiment of a third aspect of the invention provides a vehicle comprising a memory, a processor; the processor reads the executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the method for acquiring the battery capacity of the embodiment of the first aspect of the present invention.
The vehicle of the embodiment of the invention, when the program stored thereon corresponding to the method for acquiring the battery capacity of the embodiments of the first and second aspects is executed, acquires the first SOC of the state of charge of the battery by detecting that the continuous standing time of the battery is greater than or equal to the preset threshold time; the method and the device have the advantages that the fact that the battery has charging action or discharging action and is in a fully charged or discharged state is detected, the first charge quantity accumulated or released from the first SOC to the time when the battery is fully charged or discharged is obtained to obtain the capacity of the battery, the actual capacity of the battery can be obtained when the fully charged or discharged state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily using process of the battery.
An embodiment of the fourth aspect of the present invention provides a non-transitory computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the method of acquiring battery capacity of the first invention embodiment of the present invention.
A non-transitory computer readable storage medium of an embodiment of the present invention, on which a program corresponding to the method for acquiring battery capacity of the above-described first, second, and third aspect embodiments is executed, acquires a state of charge first SOC of a battery by detecting that a battery continuous rest time is greater than or equal to a preset threshold time; the method and the device have the advantages that the battery is detected to have charging action or discharging action and is in a full-charge or empty-charge state, the first charge quantity accumulated or released from the first SOC to the full-charge or empty-charge state of the battery is obtained to obtain the capacity of the battery, the situation that the capacity of the battery can be obtained only when the battery is fully charged and then the battery is empty-charge can be avoided, the actual capacity of the battery can be obtained when one of the full-charge or empty-charge state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily use process of the battery.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a method of acquiring battery capacity according to a first embodiment of the present invention;
FIG. 2 is a graph of the change over time of the state of charge SOC of the battery according to the first embodiment of the present invention;
FIG. 3 is a flow chart of a method for obtaining battery capacity according to a second embodiment of the present invention;
fig. 4 is a diagram of SOC-OCV curves of the battery according to the first embodiment of the present invention;
FIG. 5 is a flow chart of a method of obtaining battery capacity according to a second embodiment of the present invention;
FIG. 6 is a graph of the state of charge, SOC, of a battery over time according to a second embodiment of the present invention;
fig. 7 is a block diagram of a device for acquiring battery capacity according to a first embodiment of the present invention;
fig. 8 is a block diagram of the vehicle according to the first embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
A method of acquiring a battery capacity, an apparatus for acquiring a battery capacity, a vehicle, and a non-transitory computer-readable storage medium according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, a method for obtaining battery capacity according to an embodiment of the present invention includes:
s1: detecting whether the continuous standing time of the battery is greater than or equal to a preset threshold time or not;
s2: when the battery continuous standing time is detected to be greater than or equal to the preset threshold time, acquiring a first SOC of the state of charge of the battery, and recording the time of acquiring the first SOC as a first time;
s3: after the first moment, if the battery is detected to have a charging action or a discharging action, judging whether the battery is in a fully charged or discharged state;
s4: if the battery is in a fully charged or discharged state, recording the time when the battery is fully charged or discharged as a second time, and acquiring a first electric charge accumulated or released by the battery from the first time to the second time, wherein the first electric charge is not 0;
s5: and acquiring the capacity of the battery according to the first SOC, the first charge quantity and the state of full charge or empty charge of the battery.
Specifically, the state of charge of the battery refers to a ratio of a remaining capacity of the battery after being used for a certain period of time or left unused for a long period of time to a capacity of its full charge state, and ranges from 0 to 1, indicating that the battery is completely discharged when the SOC is 0, and indicating that the battery is completely charged when the SOC is 1.
It should be noted that after the battery is charged or discharged once, chemical reaction still occurs inside the battery, electromotive force at both ends of the battery is in an unstable state, and the temperature of the battery is also different from the external environment, so it is necessary to detect whether the time for which the battery is left standing is long enough to confirm that a stable state of charge of the battery is obtained. The preset threshold time is related to the characteristics of the battery itself, such as the power battery usually used in automobiles needs to be left for 1 to 2 hours.
In the method for acquiring the capacity of the battery according to the embodiment of the present invention, the acquired first SOC may be any value from 0 to 1, the acquired first charge amount is an accumulated amount, and the battery may be in a charging state or a discharging state from the first time to the second time, or may be intermittently charged or discharged, depending on the usage of the battery.
Referring to fig. 2, it shows the variation curve of the battery state of charge with time, the battery state of charge is in an unstable state at the initial time of the battery standing, and after the standing time is long enough, the SOC value is stable, and is shown as a straight line segment in the figure; the SOC shows a rising curve in the graph when the battery is charged; the SOC shows a decreasing curve in the graph as the battery is discharged; and in the time period from 0 to t1, when the battery continuous standing time is detected to be greater than or equal to the threshold time, acquiring the first SOC of the state of charge at the time point t 1. After time t1, the battery is charged and discharged, and is still standing for a short time, and the battery is fully charged until time t 2. A first amount of charge accumulated or released by the battery from time t1 to time t2 is acquired. And finally, acquiring the capacity of the battery according to the SOC1 and the accumulated first charge amount.
It can be understood that in the daily use of the battery, the situation that the battery is fully charged or discharged from a certain charge state is frequently occurred, so that the method for acquiring the capacity of the battery of the embodiment of the invention is convenient for acquiring the actual capacity of the battery in the daily use process of the battery.
According to the method for acquiring the battery capacity, when the battery continuous standing time is detected to be greater than or equal to the preset threshold time, the first SOC of the state of charge of the battery is acquired; the method and the device have the advantages that the battery is detected to have charging action or discharging action and is in a full-charge or empty-charge state, the first charge quantity accumulated or released from the first SOC to the full-charge or empty-charge state of the battery is obtained to obtain the capacity of the battery, the situation that the capacity of the battery can be obtained only when the battery is fully charged and then the battery is empty-charge can be avoided, the actual capacity of the battery can be obtained when one of the full-charge or empty-charge state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily use process of the battery.
Referring to fig. 3, in some embodiments, obtaining the state of charge of the battery by the first SOC comprises:
s21: acquiring the temperature and the open circuit voltage OCV of the battery;
s22: a first SOC is obtained from an SOC-OCV curve of the battery.
Referring to fig. 4, there is shown battery SOC-OCV curve data according to an embodiment of the present invention. In the figure, under the condition of a constant battery temperature, the open-circuit voltage OCV of the battery and the state of charge SOC are in a one-to-one correspondence relationship, and the first SOC of the battery can be obtained according to a battery SOC-OCV curve. Note that SOC-OCV curve data of the battery is known at the time of shipment, and batteries of the same type are used in the same battery pack, and the same OCV curve is shared.
In this way, the first SOC can be obtained from the SOC-OCV curve of the battery by obtaining the temperature and the open-circuit voltage OCV of the battery.
In some embodiments, the step of obtaining the capacity of the battery based on the first SOC, the first amount of charge, and the state of the battery being fully charged or discharged includes: if the battery is in a fully charged state, the capacity C of the battery is: c ═ Q1/(1-SOC 1); if the battery is in an empty state, the capacity C of the battery is: c is Q1/SOC 1; where Q1 is the first charge amount and SOC1 is the first SOC.
For example, if the acquired value of the first SOC is 20%, and the first charge amount accumulated in the battery when the battery is fully charged is 40AH, the actual capacity of the battery can be calculated as 50AH according to the above formula; when the battery is discharged, the first amount of charge discharged from the battery is 10AH, and the battery capacity is calculated to be 50AH in the same manner.
Thus, the capacity of the battery can be obtained according to the first SOC, the first charge amount and the state of full charge or empty charge of the battery.
Referring to fig. 5, in some embodiments, the method for obtaining battery capacity further includes:
s6: if the battery is in a state of not fully charged and not discharged, detecting whether the time for the battery to continuously stand is greater than or equal to a preset threshold time;
s7: when the time for obtaining the state of charge of the battery to continuously stand is detected to be greater than or equal to the preset threshold time, obtaining the temperature and the open-circuit voltage OCV of the battery, obtaining a second SOC of the battery according to the SOC-OCV curve of the battery, and recording the time for obtaining the second SOC as a third time;
s8: acquiring a second charge amount accumulated or released by the battery from the first moment to a third moment, wherein the second charge amount is not 0;
s9: and acquiring the capacity of the battery according to the first SOC, the second SOC and the second charge quantity.
Referring to fig. 6, after the first SOC is obtained, the battery has charging and discharging operations, but the battery is not detected to be fully charged or discharged. When the time that the battery is detected to be in the standing state at the time t3 is longer than or equal to the threshold time, the temperature and the open-circuit voltage OCV of the battery are obtained, the second SOC of the battery is obtained according to the SOC-OCV curve of the battery, the time that the second SOC is obtained is recorded as a third time, and the capacity of the battery is obtained according to the first SOC, the second SOC and the second charge quantity accumulated or released by the battery from the first time to the third time.
In this manner, the actual capacity of the battery can be acquired by acquiring the second SOC according to the amount of charge accumulated or released from the battery from the first SOC to the second SOC by acquiring the second SOC when it is detected that the time during which the battery is left standing is greater than or equal to the threshold time after the first SOC is acquired.
In some embodiments, the step of acquiring the capacity of the battery according to the first SOC, the second SOC, and the second charge amount includes: c ═ Q2/(SOC2-SOC1), where Q2 is the second amount of charge and SOC2 is the second SOC.
For example, when the acquired first SOC is 20%, and the time for which the battery is detected to be left standing after charging is equal to or longer than the threshold time, the second SOC is 80%, and the second charge amount accumulated in the battery from the first time to the third time is 30AH, the actual capacity of the battery is 60AH according to the above steps.
In some embodiments, the first amount of charge and the second amount of charge are obtained by a current integration method. Specifically, Q ═ i (t) tdt, where i (t) is a function of time of the current flowing through the battery during charging, discharging, or standing of the battery, and Q is the amount of charge accumulated or released.
Thus, the first charge amount and the second charge amount can be obtained by a current integration method.
In some embodiments, determining whether the battery is fully charged or discharged comprises the steps of: the method for judging whether the battery is in a fully charged or discharged state comprises the following steps: judging whether the highest single battery voltage of the battery reaches the upper limit voltage, if so, judging that the battery is in a fully charged state; and judging whether the lowest single battery voltage of the battery reaches the lower limit voltage, if so, judging that the battery is in a discharged state.
For example, the range of the voltage of the single battery of the power battery is 2.7V-4.2V, and the highest voltage of the single battery of the battery reaches 4.2V when the battery is charged, the battery is judged to be fully charged; and when the lowest single battery voltage of the battery reaches 2.7V during discharging, judging that the battery is discharged.
Whether the battery is fully charged or discharged is judged by judging whether the highest voltage or the lowest voltage of the single battery reaches the upper limit voltage or the lower limit voltage, so that the battery can be protected from being damaged due to over-charge or over-discharge.
Referring to fig. 7, the present invention further provides an apparatus 100 for obtaining battery capacity, including: the detection module 10 is used for detecting whether the continuous standing time of the battery is greater than or equal to a preset threshold time; the first processing module 20 is used for acquiring a first SOC (state of charge) of the battery when detecting that the continuous standing time of the battery is greater than or equal to a preset threshold time, and recording the time of acquiring the first SOC as a first time; the judging module 30 is configured to, after the first time, detect that the battery has a charging action or a discharging action, judge whether the battery is in a fully charged state or an empty state; the second processing module 40 is configured to record, when the battery is in a fully charged state or an empty charged state, that a time when the battery is fully charged or empty is a second time, and obtain a first charge amount accumulated or released by the battery from the first time to the second time, where the first charge amount is not 0; and a third processing module 50, configured to obtain the capacity of the battery according to the first SOC, the first charge amount, and a state of full charge or empty charge of the battery.
It should be noted that the foregoing explanation of the embodiment of the method for acquiring battery capacity also applies to the apparatus 100 for acquiring battery capacity of this embodiment, and the details are not repeated here.
The device 100 for acquiring the battery capacity acquires the first SOC of the battery by detecting that the continuous standing time of the battery is greater than or equal to the preset threshold time; the method and the device have the advantages that the fact that the battery has charging action or discharging action and is in a fully charged or discharged state is detected, the first charge quantity accumulated or released from the first SOC to the time when the battery is fully charged or discharged is obtained to obtain the capacity of the battery, the actual capacity of the battery can be obtained when the fully charged or discharged state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily using process of the battery.
Referring to fig. 8, the present invention further provides a vehicle 200, which includes a processor 21, a memory 22; the processor 21 runs a program corresponding to the executable program code by reading the executable program code stored in the memory 22, so as to implement the method for acquiring the battery capacity according to the embodiment of the present invention.
The vehicle 200 of the embodiment of the present invention, when a program stored thereon corresponding to the method of acquiring battery capacity of the above embodiment is executed, acquires the state of charge first SOC of the battery by detecting that the battery has continued standing time longer than or equal to a preset threshold time; the method and the device have the advantages that the fact that the battery has charging action or discharging action and is in a fully charged or discharged state is detected, the first charge quantity accumulated or released from the first SOC to the time when the battery is fully charged or discharged is obtained to obtain the capacity of the battery, the actual capacity of the battery can be obtained when the fully charged or discharged state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily using process of the battery.
The present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the method of acquiring battery capacity of an embodiment of the present invention.
A non-transitory computer-readable storage medium of an embodiment of the present invention, on which a program corresponding to the method of acquiring a battery capacity of the above-described embodiment is stored, is executed by acquiring a state of charge first SOC of a battery when it is detected that a battery continuous rest time is greater than or equal to a preset threshold time; the method and the device have the advantages that the fact that the battery has charging action or discharging action and is in a fully charged or discharged state is detected, the first charge quantity accumulated or released from the first SOC to the time when the battery is fully charged or discharged is obtained to obtain the capacity of the battery, the actual capacity of the battery can be obtained when the fully charged or discharged state of the battery is detected, and the capacity of the battery can be conveniently obtained in the daily using process of the battery.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method of obtaining battery capacity, comprising the steps of:
detecting whether the continuous standing time of the battery is greater than or equal to a preset threshold time or not;
when the battery continuous standing time is detected to be greater than or equal to the preset threshold time, acquiring a first SOC of the state of charge of the battery, and recording the time of acquiring the first SOC as a first time;
after the first moment, judging whether the battery is in a fully charged state or not if the battery is detected to have a charging action;
if the battery is in a fully charged state, recording the fully charged moment of the battery as a second moment, and acquiring a first charge amount accumulated by the battery from the first moment to the second moment, wherein the first charge amount is not 0;
acquiring the capacity of the battery according to the first SOC, the first charge amount and the fully charged state of the battery;
the acquiring the first SOC of the state of charge of the battery comprises the following steps:
acquiring the temperature and the open-circuit voltage OCV of the battery;
and acquiring the first SOC according to the SOC-OCV curve of the battery.
2. The method of claim 1, wherein the step of obtaining the capacity of the battery according to the first SOC, the first charge amount and the fully charged state of the battery comprises:
if the battery is in a fully charged state, the capacity C of the battery is as follows: c ═ Q1/(1-SOC 1);
wherein Q1 is the first charge amount and SOC1 is the first SOC.
3. The method for obtaining battery capacity according to claim 1, further comprising the steps of:
if the battery is in the state of not fully charged, detecting whether the time for the battery to continuously stand is greater than or equal to the preset threshold time;
when the time that the battery continuously stands is detected to be more than or equal to the preset threshold time, the temperature and the open-circuit voltage OCV of the battery are obtained, a second SOC of the state of charge of the battery is obtained according to the SOC-OCV curve of the battery,
recording the time of acquiring the second SOC as a third time;
acquiring a second charge amount accumulated by the battery from the first moment to the third moment, wherein the second charge amount is not 0;
and acquiring the capacity of the battery according to the first SOC, the second SOC and the second charge amount.
4. The method of claim 3, wherein the step of obtaining the capacity of the battery according to the first SOC, the second SOC, and the second charge amount comprises: c ═ Q2/(SOC2-SOC1), where Q2 is the second charge amount and SOC2 is the second SOC.
5. The method of claim 1-4, wherein the first amount of charge and the second amount of charge are obtained by a current integration method.
6. The method for obtaining battery capacity according to claims 1-4, wherein determining whether the battery is in a fully charged state comprises the steps of:
and judging whether the highest single battery voltage of the battery reaches the upper limit voltage, if so, judging that the battery is in a fully charged state.
7. An apparatus for obtaining battery capacity, comprising:
the detection module is used for detecting whether the continuous standing time of the battery is greater than or equal to a preset threshold time or not;
the first processing module is used for acquiring a first SOC (state of charge) of the battery when the battery continuous standing time is detected to be greater than or equal to a preset threshold time, and recording the time of acquiring the first SOC as a first time;
the judging module is used for judging whether the battery is in a fully charged state or not after detecting that the battery has a charging action after the first moment;
the second processing module is used for recording the time when the battery is fully charged as a second time when the battery is fully charged, and acquiring a first electric charge accumulated or released by the battery from the first time to the second time, wherein the first electric charge is not 0;
the third processing module is used for acquiring the capacity of the battery according to the first SOC, the first charge amount and the fully charged state of the battery;
the acquiring, by the first processing module, the first SOC of the state of charge of the battery includes:
acquiring the temperature and the open-circuit voltage OCV of the battery;
and acquiring the first SOC according to the SOC-OCV curve of the battery.
8. A vehicle comprising a memory, a processor;
wherein the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the method for acquiring the battery capacity according to any one of claims 1 to 6.
9. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the method of obtaining battery capacity according to any one of claims 1-6.
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| CN111896882A (en) * | 2020-06-19 | 2020-11-06 | 宁波吉利汽车研究开发有限公司 | A battery capacity determination method, device and vehicle |
| CN112757962A (en) * | 2021-01-07 | 2021-05-07 | 天津易鼎丰动力科技有限公司 | Method for calibrating available capacity of battery by BMS |
| CN113138343B (en) * | 2021-04-09 | 2023-12-26 | 阳光储能技术有限公司 | Capacity calibration method for battery system, battery system and readable storage medium |
| CN113433473A (en) * | 2021-05-25 | 2021-09-24 | 东风柳州汽车有限公司 | Method and device for detecting capacity retention rate of battery |
| CN115877238B (en) * | 2022-12-06 | 2023-11-07 | 北汽福田汽车股份有限公司 | Method and device for detecting battery capacity, readable storage medium and electronic equipment |
| CN118425822B (en) * | 2024-07-05 | 2024-09-13 | 中电建新能源集团股份有限公司 | Battery health state value determining method and device and electronic equipment |
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