Fcc update point determination method, controller, system, and device

Abstract

The application provides an FCC update point determination method, a controller, a system and equipment. A battery state and an SOC point of a current battery are acquired. The battery state includes a charging state and a discharging state. A voltage change rate corresponding to the SOC point is determined based on a preset mapping relationship and the battery state and the SOC point. An FCC update point is determined according to the voltage change rate, so as to solve the technical problem that a certain fixed SOC point is used as an FCC update point, resulting in low SOC estimation accuracy of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a FCC update point determination method, a controller, a system and equipment. BACKGROUND

[0002] At present, for the estimation of battery SOC (State Of Charge, remaining capacity), the battery management system generally adopts the method of OCV (Open Circuit Voltage) + CC (ampere-hour integral method) + end correction realized based on FCC (Full Charge Capacity) update point. Since the ampere-hour integral method is greatly affected by temperature and rate, therefore, the selection of FCC update point is crucial to the accuracy of SOC estimation.

[0003] At present, the selection of FCC update point usually adopts a certain fixed SOC point as the FCC update point, which will continue until the battery reaches the end of life. However, selecting a fixed SOC point as the FCC update point does not take into account the influence of battery aging, temperature and rate on FCC, resulting in low accuracy of SOC estimation. SUMMARY

[0004] Therefore, the embodiments of the present application aim to provide a FCC update point determination method, a controller, a system and equipment to solve the technical problem of low accuracy of battery SOC estimation caused by not considering the aging factors of the battery and selecting a certain fixed SOC point as the FCC update point in the prior art.

[0005] In a first aspect, the present application provides a FCC update point determination method, comprising:

[0006] obtaining a battery state and an SOC point of a current battery; wherein the battery state includes a charging state and a discharging state;

[0007] determining a voltage change rate corresponding to the SOC point based on a preset mapping relationship, the battery state and the SOC point;

[0008] wherein the preset mapping relationship is used to record the corresponding relationship among different battery states, different SOC points and the voltage change rate of the battery;

[0009] determining a FCC update point according to the voltage change rate.

[0010] Further, the determination of the FCC update point according to the voltage change rate specifically includes:

[0011] determining the SOC point corresponding to the maximum voltage change rate as the FCC update point of the current battery based on the preset mapping relationship.

[0012] Further, the updating process of the preset mapping relationship comprises:

[0013] If the battery state is a charging state, the voltage change rate corresponding to each charging SOC point in the current charging period is obtained according to the SOC point;

[0014] The preset mapping relationship is modified according to the battery state, the SOC point and the voltage change rate corresponding to each charging SOC point;

[0015] Or, if the battery state is a discharging state, the voltage change rate corresponding to each discharging SOC point in the current discharging period is obtained according to the SOC point;

[0016] The preset mapping relationship is modified according to the battery state, the SOC point and the voltage change rate corresponding to each discharging SOC point.

[0017] Further, the creating process of the preset mapping relationship comprises:

[0018] The voltage change rate corresponding to each SOC point in the first complete charging process of the battery is obtained;

[0019] The preset mapping relationship is created according to the battery state, the SOC point and the voltage change rate;

[0020] Or, the voltage change rate corresponding to each SOC point in the first complete discharging process of the battery is obtained;

[0021] The preset mapping relationship is created according to the battery state, the SOC point and the voltage change rate.

[0022] Further, the calculating process of the voltage change rate comprises:

[0023] If the battery state is a charging state, the voltage change rate is equal to the ratio of the voltage corresponding to the SOC point before the change and the voltage corresponding to the SOC point after the change;

[0024] If the battery state is a discharging state, the voltage change rate is equal to the ratio of the voltage corresponding to the SOC point after the change and the voltage corresponding to the SOC point before the change.

[0025] Further, if the battery state is a charging state, the FCC updating point is 95% to 100%, and if the battery state is a discharging state, the FCC updating point is 1% to 10%.

[0026] Further, the determination of the voltage change rate corresponding to the SOC point based on the preset mapping relationship and the battery state and the SOC point comprises:

[0027] determining the voltage rate corresponding to the SOC point based on the battery state and the SOC point according to a charging voltage rate table or a discharging voltage rate table, wherein the charging voltage rate table is used to record the corresponding relationship among different SOC points and the voltage rate in a charging state, and the discharging voltage rate table is used to record the corresponding relationship among different SOC points and the voltage rate in a discharging state.

[0028] In a second aspect, the present application provides a controller, comprising a memory, a processor and a computer program stored in the memory and executed by the processor, wherein the processor implements the steps of the FCC update point determination method when executing the computer program.

[0029] In a third aspect, the present application provides a battery management system, comprising at least one battery and the controller.

[0030] In a fourth aspect, the present application provides an electronic device, comprising the battery management system.

[0031] The present application can achieve at least the following beneficial effects: since the SOC estimation accuracy of a battery is affected by the temperature and the rate of the battery, but the voltage rate corresponding to each SOC point is not affected by the temperature and the rate, the battery state, the SOC point and the voltage rate corresponding to the SOC point are determined based on a preset mapping relationship, and the FCC update point determined according to the voltage rate is not affected by the temperature and the rate, which is beneficial to improve the SOC estimation accuracy; moreover, the FCC update point is determined according to the voltage rate corresponding to the current battery state and the SOC point of the current battery, the voltage rate of the same charging / discharging cycle of the previous battery state, and the voltage rate of the same charging / discharging cycle of the previous battery state can reflect the actual use of the battery, thereby overcoming the influence of battery aging on the FCC and improving the SOC estimation accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Fig. 1 shows a flow chart of an FCC update point determination method provided by an embodiment of the present application;

[0033] Figure 2 Fig. 2 shows a detailed flow chart of an FCC update point determination method provided by an embodiment of the present application;

[0034] Figure 3 Fig. 3 shows a schematic diagram of a controller provided by an embodiment of the present application;

[0035] Figure 4 Fig. 4 shows a schematic diagram of a battery management system provided by an embodiment of the present application;

[0036] Figure 5 A FCC update point determination apparatus is shown in the embodiment of the specification. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] At present, for the estimation of the battery SOC (State Of Charge, remaining capacity), the battery management system generally adopts the method of OCV (Open Circuit Voltage) + CC (ampere-hour integral method) + end correction realized based on the FCC (Full Charge Capacity) update point. Since the ampere-hour integral method is greatly affected by temperature and rate, the selection of the FCC update point is crucial to the accuracy of the SOC estimation.

[0039] At present, the selection of the FCC update point usually adopts a certain fixed SOC point as the FCC update point, which will continue until the battery reaches the end of life. However, the selection of the fixed SOC point as the FCC update point does not take into account the influence of battery aging, temperature and rate on the FCC, resulting in low accuracy of the SOC estimation.

[0040] To solve the defects existing in the prior art, the present scheme provides the following embodiments:

[0041] The following will be described in detail with reference to the drawings in the embodiment of the specification Figures 1 to 5 , specifically:

[0042] The embodiment 1 of the specification provides a FCC update point determination method, as shown in the method flow, which includes the following steps: Figure 1

[0043] S202: Obtain the battery state and the SOC point of the current battery; wherein the battery state includes the charging state and the discharging state.

[0044] ​In the embodiments of the present specification, the charging state refers to a state in which the battery is being charged. The discharging state refers to a state in which the battery is outputting electric energy externally. The SOC point refers to the remaining electric quantity of the current battery. For example, if the SOC point of the current battery is 50%, and the battery state is the charging state, then the next charging process of the battery refers to a process in which the SOC changes from 50% to 100%. If the SOC point of the current battery is 50%, and the battery state is the discharging state, then the next discharging process of the battery refers to a process in which the SOC changes from 50% to 0.

[0045] In S204, a voltage change rate corresponding to the SOC point is determined based on a preset mapping relationship, according to the battery state and the SOC point, wherein the preset mapping relationship is used to record the corresponding relationship among the battery state, the SOC point and the voltage change rate.

[0046] In the embodiments of the present specification, the voltage change rate refers to the change in the size of the corresponding voltage in the process in which the SOC changes by 1%. Specifically, for the charging process, the voltage change rate refers to the change in the size of the corresponding voltage in the process in which the SOC increases by 1%. For the discharging process, the voltage change rate refers to the change in the size of the corresponding voltage in the process in which the SOC decreases by 1%. The battery state, the SOC point and the voltage change rate recorded in the preset mapping relationship reflect the corresponding relationship between each SOC point and the voltage change rate corresponding to each SOC point in the charging process or the discharging process of the battery under the same battery state and the same SOC point, and can be embodied in the form of a table.

[0047] For example, if the current battery state is the charging state, and the SOC point is 90%, the preset mapping relationship reflects the voltage change rate corresponding to the SOC point of 90%, 91%,..., 99% and 100% under the charging state.

[0048] If the current battery state is the discharging state, and the SOC point is 10%, the preset mapping relationship reflects the voltage change rate corresponding to the SOC point of 10%, 9%,..., 1% and 0% under the charging state.

[0049] In S206, the FCC update point is determined according to the voltage change rate.

[0050] In the embodiments of the present specification, since the voltage change rate reflects the voltage change rate of each SOC point, the voltage change rate is not affected by the temperature and the rate, so that the FCC update point determined according to the voltage change rate based on the preset mapping relationship, the battery state and the SOC point and the voltage change rate corresponding to the SOC point is not affected by the temperature and the rate, which is beneficial to improve the SOC estimation accuracy.

[0051] If the battery is in the charging state, the process of determining the charging FCC update point is determined according to the voltage change rate corresponding to the SOC points of 90%, 91%,..., 99% and 100% respectively; if the battery is in the discharging state, the process of determining the discharging FCC update point is determined according to the voltage change rate corresponding to the SOC points of 10%, 9%,..., 1% and 0% respectively.

[0052] Figure 1 The method has the advantages that, since the SOC estimation accuracy of the battery is affected by the temperature and the rate of the battery, but the voltage change rate corresponding to each SOC point is not affected by the temperature and the rate, the battery state, the SOC point and the voltage change rate corresponding to the SOC point are determined based on the preset mapping relationship, and the FCC update point determined according to the voltage change rate is not affected by the temperature and the rate, so that the SOC estimation accuracy is improved; and the FCC update point is determined according to the voltage change rate corresponding to the current battery state and the SOC point of the battery, the voltage change rate of the current battery in the same charging / discharging cycle of the previous battery state, and the voltage change rate of the current battery in the same charging / discharging cycle of the previous battery state, which can reflect the actual use of the battery, so that the influence of the aging of the battery on the FCC is overcome, and the SOC estimation accuracy is improved.

[0053] Based on the method, Figure 2 The embodiments of the present specification also provide specific implementation of the method, which will be described in detail below.

[0054] Preferably, the step of determining the FCC update point according to the voltage change rate specifically includes S208: determining the SOC point corresponding to the maximum voltage change rate as the FCC update point of the current battery based on the preset mapping relationship.

[0055] In the embodiments of the present specification, if the battery state is the charging state, the SOC point corresponding to the voltage change rate with the minimum voltage change rate is determined as the charging FCC update point of the current charging process in the charging interval of the battery according to the current SOC point in the direction of decreasing SOC; if the battery state is the discharging state, the SOC point corresponding to the voltage change rate with the minimum voltage change rate is determined as the discharging FCC update point of the current discharging process of the battery in the discharging interval of the battery according to the current SOC point in the direction of increasing SOC.

[0056] For example, if the battery state is the charging state, the voltage change rate of the SOC point of 100% to 99% is 0.9976, and the voltage change rate corresponding to the SOC point of 99% to 98% is 0.9991, so the SOC point of 99% is selected as the FCC update point.

[0057] Preferably, the updating process of the preset mapping relationship comprises: if the battery state is a charging state, obtaining a voltage change rate corresponding to each charging SOC point in a current charging period according to the SOC point; and modifying the preset mapping relationship according to the battery state, the SOC point and the voltage change rate corresponding to each charging SOC point.

[0058] In the embodiments of the present specification, since the starting SOC point at the beginning of charging is likely to be different each time the battery is charged during use, the corresponding charging period of the battery is actually different each time. For example, the first charging period of the battery is 10% to 100%, but the second charging period of the battery can be 50% to 100%. Further, when determining the FCC update point in the current charging period of the battery, first, the last charging period with the same starting SOC point as the current charging period is determined, and then the preset mapping relationship is modified according to the voltage change rate corresponding to each SOC point in the same charging period, the battery state and each SOC point, so as to conform to the current charging period of the battery.

[0059] Preferably, the updating process of the preset mapping relationship comprises: if the battery state is a charging state, obtaining a voltage change rate corresponding to each charging SOC point in a current charging period according to the SOC point; and modifying the preset mapping relationship according to the battery state, the SOC point and the voltage change rate corresponding to each charging SOC point.

[0060] In the embodiments of the present specification, since the starting SOC point at the beginning of discharging is likely to be different each time the battery is discharged during use, the corresponding discharging period of the battery is actually different each time. For example, the first discharging period of the battery is 20% to 0%, but the second charging period of the battery can be 10% to 0%. Further, when determining the FCC update point in the current discharging period of the battery, first, the last discharging period with the same starting SOC point as the current discharging period is determined, and then the preset mapping relationship is modified according to the voltage change rate corresponding to each SOC point in the same discharging period, the battery state and each SOC point, so as to conform to the current discharging period of the battery.

[0061] Preferably, the creating process of the preset mapping relationship comprises: obtaining a voltage change rate corresponding to each SOC point in a first complete charging process of the battery; and creating the preset mapping relationship according to the battery state, the SOC point and the voltage change rate.

[0062] In the embodiment of the present specification, the initial preset mapping relationship creation process needs to obtain a complete charging process, i.e., the process of SOC point changing from 0 to 100%, record the voltage change rate of each SOC point in the process, and create the preset mapping relationship based on the charging state, all the SOC points contained in the complete charging process, and the voltage change rate of each SOC point, so as to determine the second charging FCC update point according to the starting SOC point of the second charging.

[0063] Meanwhile, the preset mapping relationship created for the first time is modified according to the SOC points contained in the second charging period and the voltage change rate corresponding to each SOC point to form a new preset mapping relationship, so as to be called when determining the FCC update point of the third charging process.

[0064] Preferably, the preset mapping relationship creation process comprises: obtaining the voltage change rate corresponding to each SOC point in the first complete discharge process of the battery; and creating the preset mapping relationship according to the battery state, the SOC point and the voltage change rate.

[0065] In the embodiment of the present specification, the initial preset mapping relationship creation process needs to obtain a complete discharge process, i.e., the process of SOC point changing from 100% to 0, record the voltage change rate of each SOC point in the process, and create the preset mapping relationship based on the discharge state, all the SOC points contained in the complete discharge process, and the voltage change rate of each SOC point, so as to determine the second discharge FCC update point according to the starting SOC point of the second discharge.

[0066] Meanwhile, the preset mapping relationship created for the first time is modified according to the SOC points contained in the second discharge period and the voltage change rate corresponding to each SOC point to form a new preset mapping relationship, so as to be called when determining the FCC update point of the third discharge process, thereby realizing dynamic updating of the preset mapping relationship with the aging degree of the battery, conforming to the actual use of the battery, improving the accuracy of FCC update point determination, and further improving the SOC estimation accuracy.

[0067] Preferably, the voltage change rate calculation process specifically comprises: if the battery state is the charging state, the voltage change rate is equal to the ratio of the voltage corresponding to the SOC point before the change to the voltage corresponding to the SOC point after the change; if the battery state is the discharge state, the voltage change rate is equal to the ratio of the voltage corresponding to the SOC point after the change to the voltage corresponding to the SOC point before the change.

[0068] In the embodiment of the present specification, it is specified that the voltage change rate is calculated in the above manner, and in actual use, it can be self-set according to actual conditions.

[0069] The following is an example of calculating the voltage change rate: when the SOC point of the battery is 90%, the voltage corresponding to the SOC point before the change is 5V, and the voltage corresponding to the SOC point after the change is 10V, the voltage change rate of the SOC point is 5V / 10V, which is equal to 0.5. It should be noted that the numerical size relationship contained in the above example does not represent the actual situation.

[0070] Preferably, if the battery state is a charging state, the FCC update point is usually an SOC point of 95% to 100%, and if the battery state is a discharging state, the FCC update point is usually an SOC point of 1% to 10%.

[0071] In the embodiments of the present application, the determination of the FCC update point of the battery can also be further determined in combination with other actual conditions of the battery, which are not limited herein.

[0072] Preferably, the determination of the voltage change rate corresponding to the SOC point based on the preset mapping relationship, the battery state and the SOC point comprises: determining the voltage change rate corresponding to the SOC point based on a charging voltage change rate table or a discharging voltage change rate table, according to the battery state and the SOC point; wherein the charging voltage change rate table is used to record the corresponding relationship between different SOC points and the voltage change rate in a charging state, and the discharging voltage change rate table is used to record the corresponding relationship between different SOC points and the voltage change rate in a discharging state.

[0073] In the embodiments of the present application, the preset mapping relationship can be embodied in the form of a charging voltage change rate table or a discharging voltage change rate table, that is, a table, so that the FCC update point can be determined by looking up the table.

[0074] Figure 2 The method shown, the SOC estimation accuracy of the battery is affected by the temperature and the rate of the battery, but the voltage change rate corresponding to each SOC point is not affected by the temperature and the rate, so based on the preset mapping relationship, the battery state, the SOC point and the voltage change rate corresponding to the SOC point are determined, and then the FCC update point determined according to the voltage change rate is not affected by the temperature and the rate, which is beneficial to improve the SOC estimation accuracy; and according to the current battery state and the SOC point of the battery, the voltage change rate of the current battery in the same charging / discharging cycle of the previous battery state is used to determine the FCC update point according to the voltage change rate, the voltage change rate of the same charging / discharging cycle of the previous battery state can reflect the actual use of the battery, thereby overcoming the influence of the battery aging on the FCC, and improving the SOC estimation accuracy.

[0075] Based on the same idea, the present application also provides a controller corresponding to the above FCC update point determination method, such asFigure 3 As shown in the accompanying drawings, the controller provided by the embodiments of the present application will be described below Figure 3 The controller provided by the embodiments of the present application can include at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400.

[0076] In the embodiments of the present application, the number of the processor 100, the communication interface 200, the memory 300 and the communication bus 400 is at least one, and the processor 100, the communication interface 200 and the memory 300 complete the communication with each other through the communication bus 400. Obviously, Figure 4 The communication connection shown in the processor 100, the communication interface 200, the memory 300 and the communication bus 400 shown in the accompanying drawings is only optional.

[0077] Optionally, the communication interface 200 can be the interface of the communication module, such as the interface of the GSM module.

[0078] The processor 100 can be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0079] The memory 300 can contain a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0080] The processor 100 is specifically configured to execute the application program in the memory to implement the steps of the above-mentioned FCC update point determination method.

[0081] Based on the same idea, the present specification also provides a battery management system 30 corresponding to the above-mentioned method, Figure 4 The battery management system provided by the embodiments of the present specification corresponding to the above-mentioned method is as shown in the accompanying drawings, Figure 4 The battery management system includes a battery 20 and the controller 10, wherein the controller is connected with the battery. In actual application, the battery 20 can be an energy storage battery or a power battery, which will not be listed one by one here.

[0082] Based on the same idea, the present specification also provides a FCC update point determination method device corresponding to the above-mentioned method, as shown in the accompanying drawings, Figure 5 The device includes:

[0083] The acquisition module 410 is configured to acquire the battery state and the SOC point of the current battery; wherein the battery state includes the charging state and the discharging state.

[0084] The first processing module 420 is configured to determine the battery state, the SOC point, and a voltage change rate corresponding to the SOC point based on a preset mapping relationship.

[0085] The second processing module 430 is configured to determine an FCC update point according to the voltage change rate.

[0086] Further, regarding the determination of the FCC update point according to the voltage change rate, the second processing module 430 is specifically configured to:

[0087] determine, based on the preset mapping relationship, an SOC point corresponding to a maximum voltage change rate as the FCC update point of the current battery.

[0088] Further, the creation process of the preset mapping relationship includes:

[0089] if the battery state is a charging state, obtaining, according to the SOC point, a voltage change rate corresponding to each charging SOC point in a current charging period;

[0090] modifying the preset mapping relationship according to the battery state, the SOC point, and the voltage change rate corresponding to each charging SOC point.

[0091] Further, the creation process of the preset mapping relationship includes:

[0092] if the battery state is a discharging state, obtaining, according to the SOC point, a voltage change rate corresponding to each discharging SOC point in a current discharging period;

[0093] modifying the preset mapping relationship according to the battery state, the SOC point, and the voltage change rate corresponding to each discharging SOC point.

[0094] Further, the creation process of the preset mapping relationship further includes:

[0095] obtaining, in a first complete charging process of the battery, a voltage change rate corresponding to each SOC point;

[0096] creating the preset mapping relationship according to the battery state, the SOC point, and the voltage change rate.

[0097] Further, the creation process of the preset mapping relationship further includes:

[0098] obtaining, in a first complete discharging process of the battery, a voltage change rate corresponding to each SOC point;

[0099] creating the preset mapping relationship according to the battery state, the SOC point, and the voltage change rate.

[0100] Further, the calculation process of the voltage change rate specifically comprises:

[0101] If the battery state is the charging state, the voltage change rate is equal to the ratio of the voltage corresponding to the SOC point after the change and the voltage corresponding to the SOC point before the change;

[0102] If the battery state is the discharging state, the voltage change rate is equal to the ratio of the voltage corresponding to the SOC point after the change and the voltage corresponding to the SOC point before the change.

[0103] The above describes the basic principles of the present application in combination with specific embodiments, however, it is pointed out that the advantages, advantages, effects and the like mentioned in the present application are only examples and cannot be considered as the must-haves of each embodiment of the present application. In addition, the above specific details are only for the purpose of example and for the purpose of understanding, and the above details do not limit the present application to the must-haves of the above specific details.

[0104] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0105] It is also pointed out that in the apparatus, equipment and method of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombination should be considered as equivalent solutions of the present application.

[0106] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0107] It should be understood that the adjectives "first", "second", "third", "fourth", "fifth" and "sixth" used in the embodiments of the present application are only used for clearer description of the technical solutions, and cannot be used to limit the protection scope of the present application.

[0108] The foregoing description has been presented for the purposes of illustration and description. Furthermore, the description is not intended to limit the embodiments of the application to the forms disclosed herein. Although the above discussion has focused on a number of example aspects and embodiments, those skilled in the art will recognize certain variations, modifications, changes, additions, and subcombinations.

Claims

1. A method for determining an FCC update point, the method comprising: The method comprises: acquiring a battery state and an SOC point of a current battery, wherein the battery state comprises a charging state and a discharging state; determining a voltage change rate corresponding to the SOC point based on a preset mapping relationship and the battery state and the SOC point; wherein the preset mapping relationship is used to record a corresponding relationship among different battery states, different SOC points and the voltage change rate, and a creation process of the preset mapping relationship comprises: acquiring a voltage change rate corresponding to each SOC point from 0 to 100% in a first complete charging process of the battery, creating the preset mapping relationship according to the battery state, the SOC point and the voltage change rate, modifying the preset mapping relationship created for the first time according to an SOC point contained in a second charging period and a voltage change rate corresponding to each SOC point to form a new preset mapping relationship; or acquiring a voltage change rate corresponding to each SOC point from 100% to 0 in a first complete discharging process of the battery, creating the preset mapping relationship according to the battery state, the SOC point and the voltage change rate, modifying the preset mapping relationship created for the first time according to an SOC point contained in a second discharging period and a voltage change rate corresponding to each SOC point to form a new preset mapping relationship; determining an SOC point corresponding to a maximum voltage change rate as an FCC update point of the current battery based on the preset mapping relationship.

2. The method of claim 1, wherein an update process of the preset mapping relationship comprises: if the battery state is a charging state, acquiring a voltage change rate corresponding to each charging SOC point in a current charging period according to the SOC point; modifying the preset mapping relationship according to the battery state, the SOC point and the voltage change rate corresponding to each charging SOC point; or, if the battery state is a discharging state, acquiring a voltage change rate corresponding to each discharging SOC point in a current discharging period according to the SOC point; modifying the preset mapping relationship according to the battery state, the SOC point and the voltage change rate corresponding to each discharging SOC point.

3. The method of claim 1, wherein a calculation process of the voltage change rate comprises: if the battery state is a charging state, the voltage change rate is equal to a ratio of a voltage corresponding to the SOC point before the change to a voltage corresponding to the SOC point after the change; if the battery state is a discharging state, the voltage change rate is equal to a ratio of a voltage corresponding to the SOC point after the change to a voltage corresponding to the SOC point before the change.

4. The method of claim 1, wherein if the battery state is a charging state, the FCC update point is 95% to 100%, and if the battery state is a discharging state, the FCC update point is 1% to 10%.

5. The method of claim 1, wherein the determination of the voltage change rate corresponding to the SOC point based on the preset mapping relationship and the battery state and the SOC point comprises: ​ ​ ​ ​ determining the voltage rate corresponding to the SOC point according to the battery state and the SOC point based on a charging voltage rate table or a discharging voltage rate table; wherein the charging voltage rate table is configured to record the correspondence between different SOC points and the voltage rate under a charging state; the discharging voltage rate table is configured to record the correspondence between different SOC points and the voltage rate under a discharging state. 6.A controller, comprising a memory, a processor and a computer program stored in the memory and executed by the processor, wherein, the processor implements the method according to any one of claims 1 to 5 when executing the computer program. 7.A battery management system, comprising: at least one battery and the controller according to claim 6, wherein the battery is electrically connected to the controller. 8.An electronic device, comprising the battery management system according to claim 7. ​ ​

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