Method and device for estimating battery state of charge in battery system

Abstract

The present invention provides a method and device for estimating the state of charge (SOC) of a battery in a battery system. The method comprises obtaining the SOC of a replacement module and obtaining the SOC of a main circuit battery based on the SOC of the replacement module. The replacement module is used to replace an original battery and has a capacity greater than that of the original battery. The original battery is connected in series with the main circuit battery in a lithium iron phosphate battery branch of the battery system. The method further comprises performing self-discharge detection on the replacement module and the main circuit battery, and performing balancing control when the self-discharge detection result indicates that the self-discharge is large. After the balancing control, the updated SOC of the replacement module is determined, and the SOC of the main circuit battery is updated based on the updated SOC of the replacement module. The present invention improves the accuracy of the estimation of the SOC of the main circuit battery and also expands the estimation range of the SOC of the main circuit battery, thereby further improving the stability of the battery system.

Description

Technical Field

[0001] The present invention relates to battery technology, and in particular to a method and device for estimating the state of charge of a battery in a battery system. Background Art

[0002] Chinese invention patent publication number CN114545256A discloses a method and system for estimating the state of charge (SOC) of lithium iron phosphate batteries. The method involves replacing a primary battery in the main circuit with a replacement module that has a larger capacity than the primary circuit battery. The SOC of the replacement module is denoted as X. The SOC of the replacement module and the primary circuit battery are first adjusted so that they are consistent at 0% SOC. Based on the series connection, the estimated SOC of the primary circuit during subsequent charge and discharge is X*A / B, where A is the capacity of the replacement module and B is the capacity of the primary circuit battery. Based on the charge and discharge voltage curve characteristics of lithium iron phosphate batteries, the battery voltage changes significantly with SOC in the 0% to 30% SOC range and the 90% to 100% SOC range, which can be used to estimate the SOC.

[0003] Although the above technical solution expands the charge state estimation range of the main circuit, when there is a large self-discharge between the replacement module or the main circuit battery, it will cause a large error in the charge state estimation, thereby leading to inaccurate estimation results of the charge state of the lithium iron phosphate battery. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method and device for estimating the state of charge of a battery in a battery system, so as to solve the problem of inaccurate estimation results of the state of charge of a lithium iron phosphate battery in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a method for estimating the state of charge of a battery in a battery system, comprising at least the following steps:

[0006] The lithium iron phosphate battery branch of the battery system includes the original battery and the main circuit battery connected in series, and the original battery is replaced with a replacement module with a larger capacity than the original battery;

[0007] Obtaining the state of charge of the replacement module, and obtaining the state of charge of the main circuit battery according to the state of charge of the replacement module;

[0008] performing self-discharge detection on the replacement module and the main circuit battery according to the state of charge and battery health status of the replacement module and the main circuit battery, and performing balancing control on the replacement module and the main circuit battery when the self-discharge of the replacement module or the main circuit battery is large;

[0009] After the control balance is completed, the updated state of charge of the replacement module is determined, and the state of charge of the main circuit battery is updated according to the updated state of charge of the replacement module.

[0010] Preferably, performing self-discharge detection on the replacement module and the main circuit battery respectively according to the charge states of the replacement module and the main circuit battery includes:

[0011] When the charge states of the replacement module and the main circuit battery are both in the low charge state range or the charge state of the main circuit battery is in the high charge state range, self-discharge detection is performed.

[0012] Preferably, the low state of charge range is 0% to 30%, and the high state of charge range is 90% to 100%.

[0013] Preferably, the balancing control of the replacement module and the main circuit battery includes: transferring part of the battery energy with low self-discharge in the replacement module or the main circuit battery to the battery with high self-discharge.

[0014] Preferably, the balancing control of the replacement module and the main circuit battery includes: consuming battery energy with low self-discharge in the replacement module or the main circuit battery through a resistor.

[0015] Preferably, a proportional conversion method is used to estimate the state of charge of the main circuit battery based on the state of charge of the replacement module or the updated state of charge.

[0016] Preferably, before performing self-discharge detection on the replacement module and the main circuit battery respectively according to the charge state and battery health state of the replacement module and the main circuit battery, the method further includes:

[0017] Determining a battery health status of the replacement module and a battery health status of the main circuit battery;

[0018] The current capacity of the replacement module is determined using the battery health status of the replacement module, and the current capacity of the main circuit battery is determined using the battery health status of the main circuit battery.

[0019] Preferably, during self-discharge detection, if the state of charge of the main circuit battery is not equal to n times the state of charge of the replacement module, it is determined that the replacement module or the main circuit battery has self-discharged significantly; wherein n is the ratio of the current capacity of the replacement module to the current capacity C2 of the main circuit battery, the current capacity of the replacement module is the product of the original capacity of the replacement module and the battery health state of the replacement module, and the current capacity of the main circuit battery is the product of the original capacity of the main circuit battery and the battery health state of the main circuit battery.

[0020] Preferably, the balancing control result makes the state of charge of the main circuit battery equal to n times the state of charge of the replacement module.

[0021] To achieve the above-mentioned objectives and other related objectives, the present invention also provides a device for estimating the state of charge of a battery in a battery system, comprising a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the method for estimating the state of charge of a battery in a battery system are implemented.

[0022] As described above, the method and device for estimating the state of charge of a battery in a battery system of the present invention have the following beneficial effects:

[0023] The method for estimating the battery state of charge in the battery system of the present invention performs self-discharge detection and balancing control on the existing estimated state of charge. The state of charge of the main circuit battery is estimated by updating the state of charge after balancing control, thereby avoiding interference caused by replacement modules or large self-discharge of the main circuit battery, improving the estimation accuracy of the main circuit battery state of charge, and also expanding the estimation range of the state of charge SOC of the main circuit battery, thereby further improving the stability of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic diagram of the charging voltage curve change of the lithium iron phosphate battery in the present invention.

[0025] Figure 2 FIG2 is a flow chart of a method for estimating the state of charge of a battery in a battery system according to the present invention.

[0026] Figure 3 FIG. 1 is a schematic structural diagram of a device for estimating the state of charge of a battery in a battery system according to the present invention. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] See also Figure 1-3 It should be noted that the diagrams provided in this embodiment are merely schematic illustrations of the basic concept of the present invention. Therefore, the diagrams only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0029] like Figure 1 As shown in the figure, the 0.1C charging voltage curve of lithium iron phosphate battery at 25℃ is changed. Figure 1 It can be seen that in the state of charge range of 30% to 90% SOC, the voltage does not change significantly with the SOC, which increases the difficulty of SOC estimation; while in the state of charge detection range of 0% to 30% SOC and 90% to 100% SOC, the voltage changes significantly with the state of charge. Therefore, in these two ranges, the state of charge can be estimated by voltage characteristics, and the estimation is relatively accurate.

[0030] In order to solve the technical defect in the prior art that when there is large self-discharge between replacement modules or main circuit batteries, a large error will be caused in the estimation of the charge state, thereby leading to inaccurate estimation results of the charge state of the lithium iron phosphate battery, the present invention proposes to add means of self-discharge detection and balancing control under low charge conditions (the charge state of the replacement module and the main circuit battery are both less than 30%) and high charge conditions (the charge state of the main circuit battery is greater than 90%), thereby improving the charge state estimation accuracy of the lithium iron phosphate battery and expanding the charge state estimation range of the lithium iron phosphate battery, further improving the stability of the battery system.

[0031] Method Example:

[0032] The present invention proposes a method for estimating the state of charge of a battery in a battery system, such as Figure 2 As shown, including at least:

[0033] In the embodiment of the present invention, the original capacity of the replacement module is C1', and the original capacity of the main circuit battery is C2', wherein C1' / C2'>1.

[0034] S1. Obtain the state of charge of the replacement module, and obtain the state of charge of the main circuit battery through the state of charge of the replacement module. The replacement module is used to replace the original battery and the capacity of the replacement module is greater than the capacity of the original battery. The original battery is connected in series with the main circuit battery in the lithium iron phosphate battery branch of the battery system.

[0035] In the lithium iron phosphate battery branch of the battery system of the present invention, the primary battery and the main circuit battery are the same.

[0036] The replacement module of the present invention is a replacement battery, and the replacement battery can be a lithium iron phosphate battery with a larger difference in capacity than the original battery and a higher capacity than the original battery.

[0037] The present invention estimates the state of charge of the main circuit battery using a proportional conversion method based on the state of charge of the replacement battery. Specifically, the replacement battery's state of charge is converted to the state of charge of the main circuit battery using a proportional conversion method. The greater the capacity difference between the replacement battery and the main circuit battery, the wider the range of the state of charge estimation. Therefore, the greater the difference in capacity between the replacement battery and the main circuit battery, the more accurate the estimation. However, if the difference is too large, it will result in cost waste and make it impractical.

[0038] In the embodiment of the present invention, there is no limit on the number of original batteries and replacement batteries in the replacement module. The number of replacement batteries in the original batteries and the replacement module can be the same or different. The number can be 1 or more. However, when the number is more than one, multiple original batteries can be connected in series or in parallel, and the replacement batteries in the replacement module can also be connected in series or in parallel, as long as the battery capacity of the replacement module is larger than the capacity of the original battery.

[0039] The present invention estimates the state of charge of the main circuit battery using a proportional conversion method based on the state of charge of the replacement battery. Therefore, it is necessary to first obtain the state of charge of the replacement module and determine the proportional conversion method.

[0040] In the present invention, the state of charge of the replacement module and the main circuit battery are consistent at 0% SOC. According to the series relationship, in the subsequent charging and discharging process, the relationship between the state of charge SOC_X of the main circuit battery and the state of charge SOC_T of the replacement module is:

[0041] SOC_X=n`×SOC_T

[0042] The coefficient n' is the ratio of the original capacity C1' of the replacement module to the original capacity C2' of the main circuit battery, that is, n'= C1' / C2'.

[0043] In the embodiment of the present invention, the state of charge of the replacement module is obtained by estimating the state of charge based on the voltage. The state of charge of the replacement module is SOC_T, and the state of charge of the main circuit battery is SOC_X=SOC_T×(C1' / C2').

[0044] In the embodiment of the present invention, n'=2 is used as an example for explanation. The replacement module is a lithium iron phosphate battery, and the original capacity C1' of the replacement battery is twice the original capacity C2' of the main circuit battery. In other embodiments, n' can also be 1.5, 3, 4, etc.

[0045] Initially, both the replacement battery and the main circuit battery are at 0% SOC. Since they are connected in series, the same current flows through them during subsequent charge and discharge. Therefore, when the main circuit battery's SOC varies between 0% and 100%, the replacement battery's SOC is exactly half that of the main circuit battery, or 0% to 50%. Within the range where the replacement battery's SOC is more accurately detected, such as the 0% to 30% SOC detection range for lithium iron phosphate batteries, the replacement battery's SOC can be more accurately estimated based on voltage, and the main circuit battery's SOC (0% to 60% SOC) can be derived. For other ranges, the estimated main circuit battery SOC is still used (e.g., the 90% to 100% SOC range for lithium iron phosphate batteries).

[0046] Therefore, when the replacement battery's state of charge (SOC_T) is between 0% and 30% SOC, the main circuit battery's state of charge (SOC_X) is 2×SOC_T, and the estimate is relatively accurate. At this point, the main circuit battery's state of charge (SOC) can be accurately estimated from 0% to 60% SOC. For the 90% to 100% SOC range, the main circuit voltage is still used for SOC estimation. Therefore, the present embodiment can expand the accurate range of state of charge estimated based on voltage from 0% to 30% SOC and 90% to 100% SOC to 0% to 60% SOC and 90% to 100% SOC. This embodiment of the present application is merely an example and is not intended to be limiting.

[0047] S2, performing self-discharge detection on the replacement module and the main circuit battery according to the charge state of the replacement module and the main circuit battery, and performing balancing control on the replacement module and the main circuit battery when the self-discharge of the replacement module or the main circuit battery is large;

[0048] Since the state of charge of the replacement module and the main circuit battery are theoretically consistent at 0% SOC, the health state of the replacement module is considered to be SOH1 and the health state of the main circuit battery is SOH2, and SOH1 / SOH=1. According to the series relationship, in the subsequent charging and discharging process, the relationship between the state of charge SOC_X of the main circuit battery and the state of charge SOC_T of the replacement module is:

[0049] SOC_X=n`×SOC_T

[0050] However, in reality, due to some losses or other factors, large self-discharge may occur, which in turn means that the subsequent charge and discharge process may not maintain the relationship SOC_X = n` × SOC_T. When the SOC relationship cannot be maintained, the SOC result estimated by this method will have a large error. Therefore, it is necessary to perform self-discharge detection and balancing control on the replacement module and the main circuit battery to ensure the accuracy of the main circuit battery SOC estimation.

[0051] In addition, due to the change in the battery health status, the coefficient n' will change, so it is necessary to redefine the relationship between the state of charge SOC_X of the main circuit battery and the state of charge SOC_T of the replacement module:

[0052] SOC_X=n×SOC_T

[0053] Wherein, n is the ratio of the current capacity C1 of the replacement module to the current capacity of the main circuit battery, that is, n=C1 / C2, wherein the current capacity of the replacement module is the product of the original capacity C1' of the replacement module and the battery health state SOH1 of the replacement module, and the current capacity of the main circuit battery is the product of the original capacity C2' of the main circuit battery and the battery health state SOH2 of the main circuit battery; C1'>C2'.

[0054] It should be noted that, at the initial moment, SOH1 / SOH2=1, and thus, n at this moment is equal to n' at the initial moment.

[0055] The present invention updates the current capacity of the replacement module and the main circuit battery through the battery health status, then re-determines the new balance relationship between the charge state of the main circuit battery and the charge state of the replacement module, and finally makes a judgment based on the new balance relationship, thereby improving the accuracy of self-discharge judgment.

[0056] Since the self-discharge detection is performed on the replacement module and the main circuit battery respectively according to the charge state and battery health state of the replacement module and the main circuit battery, before the self-discharge detection is performed, the following steps are further included:

[0057] Determining a battery health status of the replacement module and a battery health status of the main circuit battery;

[0058] The current capacity of the replacement module is determined using the battery health status of the replacement module, and the current capacity of the main circuit battery is determined using the battery health status of the main circuit battery.

[0059] Among them, the method for determining and obtaining the battery health status is an existing technology and will not be described in detail in the embodiment of the present invention.

[0060] In one possible implementation, when the charge states of the replacement module and the main circuit battery are both in a low charge state range or the charge state of the main circuit battery is in a high charge state range, self-discharge detection is performed and self-discharge is balanced and controlled.

[0061] In the embodiment of the present invention, the low state of charge range is 0% to 30%, and the high state of charge range is 90% to 100%.

[0062] During the self-discharge detection process, the state of charge of the replacement module is estimated based on the voltage of the replacement module or the ampere-hour integration method, and the state of charge of the main circuit battery is estimated based on the voltage of the main circuit battery;

[0063] When the state of charge of the replacement module and the main circuit battery are both in the low state of charge range (0% to 30%), a self-discharge test is performed to determine whether the replacement module or the main circuit battery has a large self-discharge;

[0064] Specifically, the state of charge SOC_X of the main circuit battery estimated based on the voltage is less than 30%, and the state of charge SOC_T of the replacement module estimated based on the voltage is less than 30%:

[0065] If SOC_X>n×SOC_T, it is determined that the replacement module has a large self-discharge; if SOC_X<n×SOC_T, it is determined that the main circuit battery has a large self-discharge.

[0066] If SOC_X = n×SOC_T, then neither the replacement module nor the main circuit battery has a large self-discharge phenomenon.

[0067] When the state of charge of the main circuit battery is in the high state of charge range (90% to 100%), a self-discharge test is performed to determine whether the replacement module or the main circuit battery has a large self-discharge;

[0068] Specifically, the state of charge (SOC_X) of the main circuit battery estimated based on the voltage is greater than 90%, and the state of charge (SOC) of the replacement module is less than 50%.

[0069] If SOC_X>n×SOC_T, it is determined that the replacement battery has a large self-discharge; if SOC_X<n×SOC_T, it is determined that the main circuit battery has a large self-discharge;

[0070] If SOC_X = n×SOC_T, then neither the replacement module nor the main circuit battery has a large self-discharge phenomenon.

[0071] According to the characteristic curve of voltage and state of charge, between 30% and 60%, the change of voltage with SOC is not obvious. Therefore, estimating SOC based on voltage may easily cause large deviations. Therefore, the state of charge can be estimated according to other methods in the prior art, such as the ampere-hour integration method.

[0072] According to the self-discharge detection, if there is a large self-discharge phenomenon, balancing control is performed to make SOC_X=n×SOC_T again to ensure the accuracy of the subsequent estimation of the state of charge of the main circuit battery.

[0073] In another preferred embodiment of the present invention, taking into account that absolute balance cannot be maintained stably during the balancing control process, therefore, in practical applications, it can be considered that on the basis of the judgment conditions in the embodiment of the present invention, a certain deviation is allowed to judge whether there is large self-discharge, wherein the deviation can be the deviation size (single value or interval) or a certain proportional value.

[0074] Specifically, for example, whether in the low or high state-of-charge range, if SOC_X > n × SOC_T + δ, the replacement module is determined to have significant self-discharge; if SOC_X < n × SOC_T - δ, the main circuit battery is determined to have significant self-discharge; and if SOC_X = n × SOC_T ± δ, neither the replacement module nor the main circuit battery is determined to have significant self-discharge; where δ represents the magnitude of the deviation. The present embodiment does not impose any specific restrictions on the specific value or range of δ, and may be selected based on actual circumstances.

[0075] In an embodiment of the present invention, if one of the replacement modules or the main circuit battery has a high self-discharge rate, it indicates that the other has a low self-discharge rate. The balancing control of the present invention is either active balancing or passive balancing. Active balancing transfers energy from the battery with low self-discharge rate in the replacement module or the main circuit battery to the battery with high self-discharge rate; passive balancing consumes energy from the battery with low self-discharge rate in the replacement module or the main circuit battery through resistance.

[0076] The present invention readjusts the charge state relationship between the replacement module and the main circuit battery through balancing control to ensure the accuracy of the charge state of the main circuit battery obtained according to the updated charge state of the replacement module.

[0077] S3, after controlling the balancing, determining the updated state of charge of the replacement module, and updating the state of charge of the main circuit battery according to the updated state of charge of the replacement module.

[0078] After controlling and balancing the batteries of the lithium iron phosphate battery branch of the battery system, the updated state of charge of the replacement module is determined, and then the method of step S1 is adopted, that is, the updated state of charge of the main circuit battery is estimated by a proportional conversion method based on the updated state of charge of the replacement module. The state of charge of the main circuit battery is updated by the updated state of charge of the main circuit battery to obtain a more accurate state of charge of the main circuit.

[0079] The updated SOC of the replacement module is determined as follows: if the SOC of the replacement module remains unchanged during balancing control, the updated SOC is the original SOC. If the SOC of the replacement module changes during balancing control, the SOC of the replacement module must be re-acquired or recalculated to determine the updated SOC. However, in actual applications, if the balancing control time is prolonged, the SOC of the replacement module will change regardless of whether it is being used as a controlled balancing target. In this case, the updated SOC of the replacement module will always be the newly acquired SOC.

[0080] Specifically, the updated state of charge of the main circuit battery is estimated by a proportional conversion method based on the updated state of charge of the replacement module. The updated state of charge of the main circuit battery is used as the state of charge of the main circuit battery. The state of charge of the main circuit battery estimated by the updated state of charge after balancing control avoids the interference caused by large self-discharge of the replacement module or the main circuit battery, improves the estimation accuracy of the state of charge of the main circuit battery, expands the estimation range of the state of charge SOC of the main circuit battery, and further improves the stability of the battery system.

[0081] Device Example:

[0082] The present invention also provides a schematic diagram of a battery state of charge estimation device in a battery system. Figure 3 As shown, it includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the method for estimating the state of charge of a battery in the battery system are implemented.

[0083] The detailed process of the steps of the method for estimating the state of charge of a battery in a battery system has been described in detail in the method embodiment and will not be repeated here.

[0084] In summary, the present invention provides a method and device for estimating the battery state of charge in a battery system. The method performs self-discharge detection and balancing control on the existing estimated state of charge. The updated state of charge estimate obtained after balancing control avoids interference caused by module replacement or large self-discharge of the main circuit battery, further improves the estimation accuracy of the main circuit battery state of charge, and expands the estimation range of the main circuit battery state of charge (SOC), thereby further improving the stability of the battery system. Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial application value.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for estimating the state of charge of a battery in a battery system, characterized in that: At least the following steps are included: Obtaining a state of charge (SOC) of a replacement module, and obtaining the SOC of the main circuit battery based on the SOC of the replacement module, wherein the replacement module is used to replace the original battery and has a capacity greater than that of the original battery, and the original battery is connected in series with the main circuit battery in a lithium iron phosphate battery branch of the battery system; Self-discharge detection is performed on the replacement module and the main circuit battery based on their state of charge and battery health status. When the self-discharge of the replacement module or the main circuit battery is large, balancing control is performed on the replacement module and the main circuit battery. The balancing control result makes the state of charge of the main circuit battery equal to n times the state of charge of the replacement module, where n is the ratio of the current capacity of the replacement module to the current capacity of the main circuit battery. After the control balance is completed, the updated state of charge of the replacement module is determined, and the state of charge of the main circuit battery is updated according to the updated state of charge of the replacement module.

2. The method for estimating the state of charge of a battery in a battery system according to claim 1, wherein: The self-discharge detection of the replacement module and the main circuit battery respectively according to the charge state of the replacement module and the main circuit battery includes: When the charge states of the replacement module and the main circuit battery are both in the low charge state range or the charge state of the main circuit battery is in the high charge state range, self-discharge detection is performed.

3. The method for estimating the state of charge of a battery in a battery system according to claim 2, wherein: The low state of charge range is 0% to 30%, and the high state of charge range is 90% to 100%.

4. The method for estimating the state of charge of a battery in a battery system according to claim 1, wherein: The balancing control of the replacement module and the main circuit battery includes: transferring part of the battery energy with low self-discharge in the replacement module or the main circuit battery to the battery with high self-discharge.

5. The method for estimating the state of charge of a battery in a battery system according to claim 1, wherein: The balancing control of the replacement module and the main circuit battery includes: consuming battery energy with low self-discharge in the replacement module or the main circuit battery through a resistor.

6. The method for estimating the state of charge of a battery in a battery system according to claim 1, wherein: The main circuit battery state of charge is estimated based on the state of charge of the replacement module or the updated state of charge using a proportional conversion method.

7. The method for estimating the state of charge of a battery in a battery system according to claim 1, wherein: Before performing self-discharge detection on the replacement module and the main circuit battery respectively according to the charge state and battery health state of the replacement module and the main circuit battery, the method further includes: Determining a battery health status of the replacement module and a battery health status of the main circuit battery; The current capacity of the replacement module is determined using the battery health status of the replacement module, and the current capacity of the main circuit battery is determined using the battery health status of the main circuit battery.

8. The method for estimating the state of charge of a battery in a battery system according to claim 7, wherein: During self-discharge detection, if the state of charge of the main circuit battery is not equal to n times the state of charge of the replacement module, it is determined that the replacement module or the main circuit battery has self-discharged significantly; the current capacity of the replacement module is the product of the original capacity of the replacement module and the battery health status of the replacement module, and the current capacity of the main circuit battery is the product of the original capacity of the main circuit battery and the battery health status of the main circuit battery.

9. A device for estimating the state of charge of a battery in a battery system, characterized in that: The method comprises a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the method implements the steps of the method for estimating the state of charge of a battery in a battery system according to any one of claims 1 to 8.

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