Battery module maintenance method and system, equipment, medium and program product

Abstract

The invention discloses a maintenance method and system of a battery module, equipment, a medium and a program product, and the maintenance method comprises the steps: when the first discharge efficiency of the battery module is not greater than a first efficiency threshold value, determining the second discharge efficiency of the battery module based on the liftable capacity, the rated capacity and the dischargeable capacity of the battery module, determining the charging efficiency of the battery module based on the liftable capacity, the rated capacity and the chargeable capacity of the battery module; wherein the capacity capable of being increased is used for representing the capacity capable of being released by the battery module after the battery module carries out the charging operation relative to the capacity before the charging operation; the first discharge efficiency is the ratio of the liftable capacity to the rated capacity of the battery module; based on the second discharging efficiency and / or charging efficiency of the battery module, detecting the health state of the battery module; and determining a maintenance strategy matched with the detection result, and maintaining the battery module according to the maintenance strategy. According to the invention, troubleshooting is carried out on the power station, and processized operation and maintenance suggestions are provided.

Description

Technical Field

[0001] This invention relates to the field of energy storage batteries, and specifically to a maintenance method, system, equipment, medium, and program product for a battery module. Background Technology

[0002] Before an energy storage power station is put into operation, conducting a comprehensive and accurate return on investment (IRR) calculation is a crucial step in ensuring project feasibility. Calculations including cost estimation, operation and maintenance cost estimation, and revenue estimation provide a comprehensive economic assessment of the energy storage power station project. However, as the power station becomes operational, various factors can cause the overall power station efficiency to decrease, severely impacting the previously calculated IRR.

[0003] Currently, there are various national standards related to energy storage safety, such as GB / T40090-2021, also known as the "Operation and Maintenance Procedures for Energy Storage Power Stations," which details the technical requirements for energy storage power stations during normal operation, abnormal operation, fault handling, and maintenance. The publication of this standard aims to ensure the safety, stability, and efficiency of energy storage power stations, providing guidance for the reliability and sustainable development of energy storage systems.

[0004] Current operation and maintenance (O&M) solutions generally cover various voltage and temperature anomalies, but they lack a systematic analysis of the causes of economic inefficiencies in batteries and battery management systems, as well as corresponding O&M recommendations. Low efficiency on the DC side (battery and its management system) of energy storage power stations can be attributed to three main reasons: low DC-side charging and discharging efficiency, poor battery SOC consistency, and abnormal battery aging. Abnormal battery aging can be further categorized into issues caused by abuse or inherent battery problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art in that it is impossible to detect and maintain different abnormal conditions of batteries, and to provide a battery module maintenance method, system, equipment, medium and program product.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] Firstly, a method for maintaining a battery module is provided, the method comprising:

[0008] When the first discharge efficiency of the battery module is not greater than the first efficiency threshold, the second discharge efficiency of the battery module is determined based on the battery module's upgradable capacity, rated capacity, and dischargeable capacity, and the charging efficiency of the battery module is determined based on the battery module's upgradable capacity, rated capacity, and chargeable capacity.

[0009] The "increasable capacity" is used to characterize the additional capacity that the battery module can release after a recharging operation compared to before the recharging operation; the "first discharge efficiency" is the ratio of the battery module's release capacity to its rated capacity.

[0010] The health status of the battery module is detected based on the second discharge efficiency and / or charging efficiency of the battery module.

[0011] Determine a maintenance strategy that matches the test results, and perform maintenance on the battery module according to the maintenance strategy.

[0012] Optionally, detecting the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module includes:

[0013] When the second discharge efficiency is not greater than the second efficiency threshold, determine whether the charging efficiency is not greater than the third efficiency threshold;

[0014] When the charging efficiency is not greater than the third efficiency threshold, the health status of the battery module is determined to be unhealthy.

[0015] When the charging efficiency is greater than the third efficiency threshold, it is determined that the battery module has a short circuit.

[0016] Optionally, the step of detecting the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module further includes:

[0017] When the second discharge efficiency is greater than the second efficiency threshold, it is determined that the battery range in the battery module is greater than the potential difference threshold.

[0018] Optionally, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy includes:

[0019] When the detection result indicates that the battery module is in an unhealthy state, the maintenance strategy includes disconnecting the battery module and determining whether the battery module has reached the scrapping standard.

[0020] If the battery module reaches the scrap standard, replace the battery module.

[0021] Optionally, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes:

[0022] When the battery module is short-circuited, detect whether there is direct contact between the positive and negative terminals of the battery module and / or direct contact between the positive and negative terminals inside the battery.

[0023] If the battery module has direct contact between the positive and negative terminals and / or direct contact between the positive and negative terminals inside the battery, an alarm will be issued to prompt maintenance of the insulation layer.

[0024] Optionally, after determining whether the charging efficiency is not greater than the third efficiency threshold when the second discharge efficiency is not greater than the second efficiency threshold, the method further includes:

[0025] When the charging efficiency is greater than the third efficiency threshold, it is detected whether the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature.

[0026] The determination of a maintenance strategy matching the detection results, and the maintenance of the battery module according to the maintenance strategy, further includes:

[0027] If the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, the ambient temperature is increased to bring it up to the preset temperature.

[0028] Optionally, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes:

[0029] When the battery range difference in the battery module is greater than the potential difference threshold, the battery module is recharged.

[0030] And / or, when the battery range difference in the battery module is greater than the potential difference threshold, adjust at least one of the following parameters of the charging / discharging depth, charging / discharging rate, and running time of the charging station where the battery module is located:

[0031] And / or, when the battery range difference in the battery module is greater than the potential difference threshold, check the local temperature and heat dissipation of the battery module within a preset time period;

[0032] And / or, when the battery range difference in the battery module is greater than the potential difference threshold, check the array air-cooled and / or liquid-cooled circulation pump of the battery module.

[0033] Secondly, a maintenance system for a battery module is provided, the maintenance system comprising:

[0034] The determination module is used to determine the second discharge efficiency of the battery module based on the battery module's upgradable capacity, rated capacity, and dischargeable capacity when the first discharge efficiency of the battery module is not greater than the first efficiency threshold, and to determine the charging efficiency of the battery module based on the battery module's upgradable capacity, rated capacity, and chargeable capacity.

[0035] The "increasable capacity" is used to characterize the additional capacity that the battery module can release after a recharging operation compared to before the recharging operation; the "first discharge efficiency" is the ratio of the battery module's release capacity to its rated capacity.

[0036] The detection module is used to detect the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module.

[0037] The maintenance module is used to determine a maintenance strategy that matches the test results, and to maintain the battery module according to the maintenance strategy.

[0038] Thirdly, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and for running on the processor, wherein the processor executes the computer program to implement the maintenance method for the battery module as described in the first aspect.

[0039] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the battery module maintenance method as described in the first aspect.

[0040] Fifthly, a computer program product is provided, including a computer program that, when executed by a processor, implements the maintenance method for the battery module as described in the first aspect.

[0041] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0042] The positive and progressive effects of this invention are as follows: based on the charging and discharging efficiency of the battery module, the health status of the battery is detected, the cause of low battery charging and discharging efficiency is determined, different maintenance solutions are determined according to different causes, and a process-oriented operation and maintenance suggestion is provided for the charging and discharging efficiency of the power station, and further systematic problem investigation is carried out on the DC side of the relevant power station. Attached Figure Description

[0043] Figure 1 This is a first flowchart of a battery module maintenance method provided in an embodiment of the present invention;

[0044] Figure 2 This is a second flowchart of a battery module maintenance method provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of a battery module maintenance system provided in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0047] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the document does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] As illustrated herein, unless the context clearly indicates otherwise, the words “a,” “an,” “an,” and / or “the” do not specifically refer to the singular and may also include the plural. Generally speaking, the terms “comprising” and “including” only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0050] The definitions used herein, such as the terms “having,” “may have,” “comprising,” or “may include,” indicate the presence of the corresponding function, operation, element, etc., and do not limit the presence of one or more other functions, operations, elements, etc. Furthermore, it should be understood that the terms “comprising” or “having” as used herein indicate the presence of the features, figures, steps, operations, elements, components, or combinations thereof described in the specification, without excluding the presence or addition of one or more other features, figures, steps, operations, elements, components, or combinations thereof.

[0051] like Figure 1 As shown, an embodiment of the present invention provides a battery module maintenance method comprising the following steps:

[0052] S11. When the first discharge efficiency of the battery module is not greater than the first efficiency threshold, the second discharge efficiency of the battery module is determined based on the battery module's upgradable capacity, rated capacity, and dischargeable capacity, and the charging efficiency of the battery module is determined based on the battery module's upgradable capacity, rated capacity, and chargeable capacity.

[0053] The scalable capacity characterizes the additional capacity that a battery module (a group of multiple battery cells forming a single system, i.e., a battery module) can release after a recharging operation, relative to before the operation. The reference calculation method for scalable capacity is as follows: Based on the historical charge / discharge parameters of each battery in the battery module, a reference battery that meets preset charge / discharge conditions is selected from the battery module. The remaining batteries in the battery module, excluding the reference batteries, are obtained. Based on the first historical charge / discharge parameters of the reference batteries and the second historical charge / discharge parameters of each remaining battery, the chargeable capacity and discharge capacity of each remaining battery relative to the reference battery are obtained. The difference between the chargeable capacity and discharge capacity of each remaining battery is used to obtain the relative capacity of each remaining battery relative to the reference battery. The capacity that meets the first preset capacity condition from the discharge capacity is taken as the first capacity, and the capacity that meets the second preset capacity condition from the relative capacity is taken as the second capacity. The scalable capacity of the battery module is calculated based on the first and second capacities.

[0054] Performing a charging operation, also known as balancing or battery equalization, involves the following steps: First, obtain the historical charge / discharge parameters for each battery in the battery module. Based on these parameters, determine if the batteries that first reach the charging cutoff and the first reach the discharging cutoff are the same battery. If they are not the same battery, designate it as the initial battery to be charged. Then, select the reference battery that meets the preset charge / discharge conditions from the initial batteries to be charged, and use the remaining initial batteries as target batteries to be charged. Based on the historical charge / discharge parameters of the reference batteries and each target battery, obtain the target capacity for each target battery. Determine the charging cutoff condition for each target battery based on the target capacity. Finally, charge the corresponding target battery according to the charging cutoff condition. The target capacity includes the rechargeable capacity. Calculate the rechargeable capacity of each target battery relative to the reference battery based on the historical charge / discharge parameters of the reference battery and the target batteries to be charged, thus deriving the charging cutoff condition for each target battery.

[0055] The first discharge efficiency is the ratio of the battery module's discharge capacity to its rated capacity. The first discharge efficiency is calculated as follows: E ff_d =E d / E r E ff_d For the first discharge efficiency, E d For the release capacity, E rThe rated capacity is defined as follows: the discharge capacity is the ratio between the amount of electricity discharged and the decrease in the state of charge (SOC) of the battery module (the ratio of the battery's remaining capacity to its capacity when fully charged); the chargeable capacity is the ratio between the amount of electricity charged and the increase in the SOC of the battery module. The rated capacity can be obtained from the cell specification sheet.

[0056] The rechargeable capacity is calculated as follows: Where E charge For the rechargeable capacity, it is simplified to E in this embodiment of the invention. c Indicates the fillable capacity, △E charge For the amount of electricity charged this time, △SOC charge This represents the change in state of charge during charging. The discharge capacity is calculated as follows: Where E discharge For the rechargeable capacity, it is simplified to E in this embodiment of the invention. d Indicates the release capacity, ΔE discharge For the amount of electricity released this time, △SOC discharge This represents the change in the state of charge during discharge.

[0057] The overall discharge efficiency of the battery module, i.e., the first discharge efficiency, is calculated. When the first discharge efficiency is not greater than the first efficiency threshold, it is determined that the reason for the low overall discharge efficiency of the battery module is a problem with the battery's health status. It is necessary to calculate the second discharge efficiency and / or charging efficiency of the battery module and detect the health status of the battery module. The second discharge efficiency is the overall discharge efficiency of the battery module after theoretically performing a recharge operation. The second discharge efficiency increases the capacity that can be improved compared to the first discharge efficiency, which represents the improvement in the overall discharge efficiency of the battery module after the battery recharge operation, indicating the maintainability value of the battery. The first efficiency threshold can be set according to the actual situation, for example, 90%.

[0058] S12. Detect the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module.

[0059] In one embodiment, the health status of the battery module is detected based on the second discharge efficiency and / or charging efficiency of the battery module, including:

[0060] When the second discharge efficiency is not greater than the second efficiency threshold, determine whether the charging efficiency is not greater than the third efficiency threshold.

[0061] When the charging efficiency is not greater than the third efficiency threshold, the health status of the battery module is determined to be unhealthy.

[0062] When the charging efficiency is greater than the third efficiency threshold, it is determined that there is a short circuit in the battery module.

[0063] The second discharge efficiency is the overall discharge efficiency of the battery module theoretically after a recharging operation, that is, the overall discharge efficiency of the battery module is improved through recharging. The calculation method for the second discharge efficiency is as follows: E ff_b =E d +E b / E r E ff_b For the second discharge efficiency, E d For the release capacity, E b To increase capacity, E r This is the rated capacity. When the second discharge efficiency is greater than the second efficiency threshold, charging efficiency does not need to be calculated. When the second discharge efficiency is not greater than the second efficiency threshold, it is determined whether the charging efficiency is greater than the third efficiency threshold. The charging efficiency is the overall charging efficiency of the battery module theoretically after a recharging operation, that is, improving the overall charging efficiency of the battery module through recharging. The calculation method for charging efficiency is as follows: E ff_cb =E c +E b / E r E ff_cb For charging efficiency, E b To increase capacity, E c If the charging efficiency is not greater than the third efficiency threshold, the battery module is considered unhealthy. The low discharge efficiency of the battery module cannot be restored by charging or equalization operations, nor can it be restored by increasing the charging and discharging efficiency. It is highly likely that there is a problem with the battery itself. For example, the ratio of the battery's actual discharge capacity to its rated capacity is less than 80%. In other words, the reason why the battery module's overall discharge efficiency is currently low is that the battery module's health status is unhealthy. When the charging efficiency is greater than the third efficiency threshold, it is determined that the reason why the battery module's overall discharge efficiency is currently low is due to the low charging and discharging efficiency of the battery module. It is determined that there is a short circuit in the battery module, such as an external short circuit or an internal short circuit.

[0064] The second and third efficiency thresholds can be set according to the actual situation. For example, the second efficiency threshold is 85% and the third efficiency threshold is 90%. The values ​​of the first, second and third efficiency thresholds can be equal or unequal, for example, all of them are 90%.

[0065] In one embodiment, detecting the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module further includes:

[0066] When the second discharge efficiency is greater than the second efficiency threshold, it is determined that the battery range in the battery module is greater than the potential difference threshold.

[0067] When the second discharge efficiency is greater than the second efficiency threshold, it is determined that the current low discharge efficiency of the battery module is due to a problem with the consistency of the batteries in the battery module. That is, the battery range of the batteries in the battery module is greater than the potential difference threshold. The battery range is the potential difference between the battery with the largest potential and the battery with the smallest potential in the same battery module. The current discharge efficiency of the battery module can be restored to a reasonable range (greater than the second efficiency threshold) through a charging operation. In other words, the problem of the current low discharge efficiency of the battery module is solved through balancing operation.

[0068] S13. Determine a maintenance strategy that matches the test results, and perform maintenance on the battery module according to the maintenance strategy.

[0069] In one embodiment, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes:

[0070] When a short circuit occurs in the battery module, check whether there is direct contact between the positive and negative terminals of the battery module and / or direct contact between the positive and negative terminals inside the battery.

[0071] If there is direct contact between the positive and negative terminals of the battery module and / or direct contact between the positive and negative terminals inside the battery, an alarm will be issued to prompt maintenance of the insulation layer.

[0072] When a short circuit occurs in the battery module, check for external or internal short circuits. An external short circuit occurs when the positive and negative terminals of the battery are in direct contact, while an internal short circuit occurs when the positive and negative terminals inside the battery are in direct contact. Measure the insulation resistance of the positive terminal to ground and the insulation resistance of the negative terminal to ground using a multimeter. Both should not be less than 1000Ω / V. Alternatively, check for leakage. If a short circuit or leakage is found, an alarm will be issued to prompt technicians to repair the insulation layer.

[0073] In one embodiment, after determining whether the charging efficiency is not greater than the third efficiency threshold when the second discharge efficiency is not greater than the second efficiency threshold, the method further includes:

[0074] When the charging efficiency is greater than the third efficiency threshold, check whether the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature.

[0075] Determining a maintenance strategy that matches the test results, and maintaining the battery module according to the maintenance strategy, also includes:

[0076] If the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, the ambient temperature will be increased to bring it up to the preset temperature.

[0077] When the charging efficiency is greater than the third efficiency threshold, another possibility is that the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, which leads to a decrease in the charging and discharging efficiency of the battery module. The system detects whether the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature. If the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, the ambient temperature is increased to reach the preset temperature, thereby improving the overall charging and discharging efficiency of the battery module.

[0078] In one embodiment, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes:

[0079] When the battery range difference in the battery module exceeds the potential difference threshold, a recharge operation is performed on the battery module.

[0080] In one embodiment, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes: when the battery range difference in the battery module is greater than the potential difference threshold, adjusting at least one of the charge / discharge depth, charge / discharge rate, and running time of the charging station where the battery module is located.

[0081] In one embodiment, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes: when the battery range difference in the battery module is greater than the potential difference threshold, checking the local temperature and heat dissipation of the battery module within a preset time period.

[0082] The preset duration can be set according to the actual situation, such as one week.

[0083] In one embodiment, determining a maintenance strategy that matches the detection results and maintaining the battery module according to the maintenance strategy further includes: when the battery range difference in the battery module is greater than the potential difference threshold, checking the array air-cooled and / or liquid-cooled circulation pump of the battery module.

[0084] The power station comprises several battery modules. The overall power station's performance is determined by analyzing the test results of multiple battery modules. When the battery range difference within a module exceeds the potential difference threshold, it is necessary to check for any instances of battery abuse. For example, it is crucial to check whether the power station's charging and discharging operations have exceeded the charging / discharging cutoff voltage or the charging / discharging rate has exceeded the recommended rate specified in the cell specifications over the past week. If such instances exist, it is recommended to optimize and adjust the power station's depth of discharge (DOD, the percentage of battery discharge to rated capacity), charging / discharging rate, and operating time. Simultaneously, it is essential to check for any instances of thermal abuse by examining whether the battery module has experienced localized overheating or abnormal heat dissipation over the past week. The air-cooled and liquid-cooled circulation pumps of the battery array should be inspected, and the batteries should be recharged to address the current low discharge efficiency of the battery module.

[0085] In one embodiment, determining a maintenance strategy that matches the test results and maintaining the battery module according to the maintenance strategy includes:

[0086] When the test result indicates that the battery module is in an unhealthy state, the maintenance strategy includes disconnecting the battery module and determining whether the battery module has reached the scrapping standard; if the battery module has reached the scrapping standard, the battery module is replaced.

[0087] When the battery module's health status is unhealthy, it means that the battery module's discharge efficiency is low and cannot be restored by charging or equalizing operations, nor by improving charging and discharging efficiency. It is highly likely that there is a problem with the battery itself, and specific batteries need to be disconnected and further tested. If the battery reaches the scrap standard, it needs to be replaced.

[0088] This invention provides different battery module maintenance strategies based on different test results, performs corresponding maintenance on problematic batteries in different situations, provides process-oriented operation and maintenance suggestions for the charging and discharging efficiency of power stations, provides a complete operation and maintenance plan based on the reasons affecting the efficiency of batteries and battery management systems, further investigates related DC-side economic system problems of power stations, and can provide preliminary warnings of cloud aging indicators and further confirm edge-side detection equipment.

[0089] The following is combined with Figure 2 Further explanation of the maintenance methods for the battery module:

[0090] For battery modules in power plants, continuously monitor the rated capacity E. r It can be filled with a capacity of E c It can release a capacity of E d It can increase capacity E b Taking the first, second, and third efficiency thresholds as equal to 90% as an example, the overall discharge efficiency of the battery module, i.e., the first discharge efficiency E, is calculated. ff_d =E d / E r And determine E ff_d Is it below the first efficiency threshold S1? If E ff_d If <S1, then no action is required.

[0091] If E ff_d ≥S1, calculate the second discharge efficiency E of the battery module. ff_b =E d +E b / E r That is, the overall discharge efficiency of the battery module after theoretically performing a charging operation, and to determine E. ff_b Is it below the second efficiency threshold S2? If E ff_bIf the value is ≥S2, it is determined that the current low discharge efficiency of the battery module is due to a problem with the consistency of the batteries in the battery module, and the current discharge efficiency of the battery module can be restored to a reasonable range (greater than the second efficiency threshold) through a recharge operation. At this time, check whether the charging and discharging of the power station in the past week has exceeded the charging and discharging cutoff voltage, and whether the charging and discharging rate has exceeded the recommended charging and discharging rate in the cell specification. If so, it is recommended to optimize and adjust the depth of charge and discharge (DOD), charging and discharging rate, running time, etc. of the power station. At the same time, check whether there is thermal abuse, check whether there is local overheating and abnormal heat dissipation of this battery module in the past week, check the air cooling and liquid cooling circulation pumps of the battery array, and perform a recharge operation on the battery.

[0092] If E ff_b If <S2, then calculate the charging efficiency E of the battery module. ff_cb =E c +E b / E r That is, the overall charging efficiency of the battery module after theoretically performing a charging operation, and to determine E. ff_cb Is it below the third efficiency threshold S3? If E ff_cb If the value is ≥S3, the reason for the low overall discharge efficiency of the battery module is determined to be due to the low charge and discharge efficiency of the battery module. This indicates a short circuit in the battery module, such as an external or internal short circuit, or that the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, leading to a decrease in the charge and discharge efficiency of the battery module. In this case, check whether there is an external or internal short circuit. Measure the insulation resistance between the positive terminal and ground of the battery module using a multimeter. The insulation resistance between the negative terminal and ground should not be less than 1000Ω / V. Alternatively, check for leakage. If a short circuit or leakage is found, issue an alarm to prompt technicians to repair the insulation layer. Check whether the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature. If the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, increase the ambient temperature to reach the preset temperature, thereby improving the overall charge and discharge efficiency of the battery module.

[0093] If E ff_cb If <S3, it indicates that the battery in the battery module has severely degraded, the battery module is in an unhealthy state, the discharge efficiency of the battery module is low and cannot be restored by charging or equalizing operations, nor by improving the charging and discharging efficiency. It is highly likely that there is a problem with the battery itself, and specific batteries need to be disconnected and further tested. If they reach the scrap standard, the batteries need to be replaced.

[0094] This invention also provides a battery module maintenance system, such as... Figure 3 As shown, the maintenance system includes:

[0095] The determining module 31 is used to determine the second discharge efficiency of the battery module based on the battery module's upgradable capacity, rated capacity, and dischargeable capacity when the first discharge efficiency of the battery module is not greater than the first efficiency threshold, and to determine the charging efficiency of the battery module based on the battery module's upgradable capacity, rated capacity, and chargeable capacity.

[0096] The "increasable capacity" is used to characterize the additional capacity that the battery module can release after a recharging operation compared to before the recharging operation; the "first discharge efficiency" is the ratio of the battery module's release capacity to its rated capacity.

[0097] The detection module 32 is used to detect the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module.

[0098] The maintenance module 33 is used to determine a maintenance strategy that matches the test results, and to maintain the battery module according to the maintenance strategy.

[0099] Optionally, the detection module is further configured to:

[0100] When the second discharge efficiency is not greater than the second efficiency threshold, determine whether the charging efficiency is not greater than the third efficiency threshold;

[0101] When the charging efficiency is not greater than the third efficiency threshold, the health status of the battery module is determined to be unhealthy.

[0102] When the charging efficiency is greater than the third efficiency threshold, it is determined that the battery module has a short circuit.

[0103] Optionally, the detection module is further configured to:

[0104] When the second discharge efficiency is greater than the second efficiency threshold, it is determined that the battery range in the battery module is greater than the potential difference threshold.

[0105] Optionally, the maintenance module is further configured to:

[0106] When the health status of the battery module is unhealthy, the battery module is disconnected to determine whether the battery module has reached the scrapping standard.

[0107] If the battery module reaches the scrap standard, replace the battery module.

[0108] Optionally, the maintenance module is further configured to:

[0109] When the battery module is short-circuited, detect whether there is direct contact between the positive and negative terminals of the battery module and / or direct contact between the positive and negative terminals inside the battery module.

[0110] If the battery module has direct contact between the positive and negative terminals and / or direct contact between the positive and negative terminals inside the battery module, an alarm will be issued to prompt maintenance of the insulation layer.

[0111] Optionally, the detection module is further configured to:

[0112] When the charging efficiency is greater than the third efficiency threshold, it is detected whether the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature.

[0113] The maintenance module is also used for:

[0114] If the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, the ambient temperature is increased to bring it up to the preset temperature.

[0115] Optionally, the maintenance module is further configured to:

[0116] When the battery range difference in the battery module is greater than the potential difference threshold, the battery module is recharged.

[0117] And / or, when the battery range difference in the battery module is greater than the potential difference threshold, adjust at least one of the following: depth of charge / discharge, charge / discharge rate, and running time of the charging station where the battery module is located;

[0118] And / or, when the battery range difference in the battery module is greater than the potential difference threshold, check the local temperature and heat dissipation of the battery module within a preset time period;

[0119] And / or, when the battery range difference in the battery module is greater than the potential difference threshold, check the array air-cooled and / or liquid-cooled circulation pump of the battery module.

[0120] For the system embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the present invention according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0121] This invention also provides an electronic device such as Figure 4As shown, it includes a memory, a processor, and a computer program stored in the memory and used to run on the processor. When the processor executes the computer program, it implements the battery module maintenance method described in any of the above embodiments. Figure 4 The electronic device 40 shown is merely an example and should not be construed as limiting the functionality or scope of the embodiments of the present invention. Figure 4 As shown, the electronic device 40 can be manifested as a general-purpose computing device, such as a server device. The components of the electronic device 40 may include, but are not limited to: at least one processor 41, at least one memory 42, and a bus 43 connecting different system components (including memory 42 and processor 41).

[0122] Bus 43 includes a data bus, an address bus, and a control bus.

[0123] The memory 42 may include volatile memory, such as random access memory (RAM) 421 and / or cache memory 422, and may further include read-only memory (ROM) 423.

[0124] The memory 42 may also include a program tool 425 (or utility) having a set (at least one) program module 424, such program module 424 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0125] The processor 41 executes various functional applications and data processing by running computer programs stored in the memory 42, such as the battery module maintenance method described in any of the above embodiments.

[0126] Electronic device 40 can also communicate with one or more external devices 44. This communication can be performed via input / output (I / O) interface 45. Furthermore, electronic device 40 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 46. Figure 4 As shown, network adapter 46 communicates with other modules of electronic device 40 via bus 43. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with electronic device 40, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0127] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the battery module maintenance method provided in any of the above embodiments.

[0128] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0129] In a possible implementation, the present invention can also be implemented as a program product, which includes program code. When the program product is run on a terminal device, the program code is used to cause the terminal device to execute the maintenance method of the battery module implementing any of the above embodiments.

[0130] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0131] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for maintaining a battery module, characterized in that, The maintenance method includes: When the first discharge efficiency of the battery module is not greater than the first efficiency threshold, the second discharge efficiency of the battery module is determined based on the battery module's upgradable capacity, rated capacity, and dischargeable capacity, and the charging efficiency of the battery module is determined based on the battery module's upgradable capacity, rated capacity, and chargeable capacity. The "increasable capacity" is used to characterize the additional capacity that the battery module can release after a recharging operation compared to before the recharging operation; the "first discharge efficiency" is the ratio of the battery module's release capacity to its rated capacity. The health status of the battery module is detected based on the second discharge efficiency and / or charging efficiency of the battery module. Determine a maintenance strategy that matches the test results, and perform maintenance on the battery module according to the maintenance strategy.

2. The maintenance method for the battery module as described in claim 1, characterized in that, The detection of the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module includes: When the second discharge efficiency is not greater than the second efficiency threshold, determine whether the charging efficiency is not greater than the third efficiency threshold; When the charging efficiency is not greater than the third efficiency threshold, the health status of the battery module is determined to be unhealthy. When the charging efficiency is greater than the third efficiency threshold, it is determined that the battery module has a short circuit.

3. The maintenance method for the battery module as described in claim 2, characterized in that, The method of detecting the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module further includes: When the second discharge efficiency is greater than the second efficiency threshold, it is determined that the battery range in the battery module is greater than the potential difference threshold.

4. The maintenance method for the battery module as described in claim 2, characterized in that, The determination of a maintenance strategy matching the detection results, and the maintenance of the battery module according to the maintenance strategy, includes: When the detection result indicates that the battery module is in an unhealthy state, the maintenance strategy includes disconnecting the battery module and determining whether the battery module has reached the scrapping standard. If the battery module reaches the scrap standard, replace the battery module.

5. The maintenance method for the battery module as described in claim 2, characterized in that, The determination of a maintenance strategy matching the detection results, and the maintenance of the battery module according to the maintenance strategy, further includes: When the battery module is short-circuited, detect whether there is direct contact between the positive and negative terminals of the battery module and / or direct contact between the positive and negative terminals inside the battery. If the battery module has direct contact between the positive and negative terminals and / or direct contact between the positive and negative terminals inside the battery, an alarm will be issued to prompt maintenance of the insulation layer.

6. The maintenance method for the battery module as described in claim 2, characterized in that, When the second discharge efficiency is not greater than the second efficiency threshold, after determining whether the charging efficiency is not greater than the third efficiency threshold, the method further includes: When the charging efficiency is greater than the third efficiency threshold, it is detected whether the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature. The determination of a maintenance strategy matching the detection results, and the maintenance of the battery module according to the maintenance strategy, further includes: If the ambient temperature of the energy storage system where the battery module is located is lower than the preset temperature, the ambient temperature is increased to bring it up to the preset temperature.

7. The maintenance method for the battery module as described in claim 3, characterized in that, The determination of a maintenance strategy matching the detection results, and the maintenance of the battery module according to the maintenance strategy, further includes: When the battery range difference in the battery module is greater than the potential difference threshold, a recharge operation is performed on the battery module. And / or, when the battery range difference in the battery module is greater than the potential difference threshold, adjust at least one of the following: depth of charge / discharge, charge / discharge rate, and running time of the charging station where the battery module is located; And / or, when the battery range difference in the battery module is greater than the potential difference threshold, check the local temperature and heat dissipation of the battery module within a preset time period; And / or, when the battery range difference in the battery module is greater than the potential difference threshold, check the array air-cooled and / or liquid-cooled circulating pump of the battery module.

8. A battery module maintenance system, based on the battery module maintenance method according to any one of claims 1-7, characterized in that, The maintenance system includes: The determination module is used to determine the second discharge efficiency of the battery module based on the battery module's upgradable capacity, rated capacity, and dischargeable capacity when the first discharge efficiency of the battery module is not greater than the first efficiency threshold, and to determine the charging efficiency of the battery module based on the battery module's upgradable capacity, rated capacity, and chargeable capacity. The "increasable capacity" is used to characterize the additional capacity that the battery module can release after a recharging operation compared to before the recharging operation; the "first discharge efficiency" is the ratio of the battery module's release capacity to its rated capacity. The detection module is used to detect the health status of the battery module based on the second discharge efficiency and / or charging efficiency of the battery module. The maintenance module is used to determine a maintenance strategy that matches the test results, and to maintain the battery module according to the maintenance strategy.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and for running on the processor, characterized in that, When the processor executes a computer program, it implements the maintenance method for the battery module as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the maintenance method for the battery module as described in any one of claims 1-7.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the maintenance method for the battery module as described in any one of claims 1-7.

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