Storage battery validity verification method and system, storage medium and product

Abstract

The invention discloses a storage battery validity verification method and system, a storage medium and a product, relates to the field of storage battery detection and evaluation, and aims to solve the problem that the health state of storage batteries of different types and different aging states and the performance consistency of monomers in a group are difficult to accurately evaluate. According to the core scheme, a storage battery is placed in a constant-temperature environment of 25 + / -2 DEG C for standing for 24 h, and basic parameters such as initial open-circuit voltage and rated capacity are collected; setting a reference discharge current according to the battery type, calculating a dynamic adjustment coefficient by combining the cycle index, the voltage and the internal resistance, and determining an initial dynamic discharge current; data such as voltage, current and temperature are collected in real time through three-stage testing of pre-discharge, main discharge and pulse discharge; according to the method, normal use, degraded use or replacement of the storage battery is comprehensively judged through double indexes of the SOH and the capacity attenuation consistency coefficient gamma, and finally, relevant data are stored in an associated manner to form a verification file, so that accurate support is provided for operation and maintenance decisions of the storage battery, and the operation and maintenance cost is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of battery testing and evaluation, specifically to a method, system, storage medium, and product for verifying the effectiveness of a battery. Background Technology

[0002] As a rechargeable and rechargeable energy storage device, batteries are widely used in many fields such as new energy vehicles, energy storage power stations, communication base stations, and emergency power supplies. Their operational stability and effectiveness are directly related to the safe operation and service life of related equipment. With the rapid development of the new energy industry and energy storage technology, the market has put forward higher requirements for the capacity, cycle life, and safety performance of batteries. However, during long-term use, batteries will inevitably experience aging phenomena such as capacity decay, increased internal resistance, and decreased voltage stability due to factors such as the number of charge-discharge cycles, ambient temperature, and operating conditions. In severe cases, this may lead to safety hazards such as thermal runaway, leakage, or even explosion. At the same time, the inconsistent performance degradation of individual cells within the battery pack will further exacerbate the operational risks of the overall system.

[0003] Therefore, accurately verifying the effectiveness of batteries and clarifying their health status and usability is a crucial step in ensuring the reliable operation of related equipment and reducing maintenance costs. Current battery effectiveness verification methods have several shortcomings: First, they lack adaptability. Most methods use a fixed discharge current for testing, failing to fully consider the differences in electrochemical characteristics among different types of batteries such as lead-acid, lithium-ion, and nickel-metal hydride, and do not dynamically adjust test parameters based on the actual aging state of the battery. This can easily lead to distorted test results and may even cause damage such as lithium plating in lithium-ion batteries due to over-discharge or inappropriate current. Second, they lack a single evaluation dimension. Traditional methods often focus on single indicators such as capacity, neglecting key performance parameters such as instantaneous load response capability and internal resistance polarization characteristics, and do not quantify the performance consistency of individual batteries within the battery pack. The evaluation reveals several issues: firstly, individual cell inconsistencies are a significant cause of premature battery pack failure; secondly, there is insufficient safety protection and practicality, with existing testing procedures lacking pre-screening mechanisms for risks such as poor contact and initial thermal runaway, and inadequate reverse current protection measures during discharge, posing safety hazards; thirdly, test data is stored in a scattered manner, resulting in poor traceability and hindering subsequent operation and maintenance analysis; and fourthly, there is limited versatility, with most verification solutions designed for specific battery types, lacking unified testing standards and flexible adaptation mechanisms, making it difficult to meet the verification needs of multiple scenarios and battery types, and requiring separate debugging for different scenarios during implementation, leading to high application costs.

[0004] In summary, existing battery effectiveness verification methods have significant shortcomings in terms of adaptability, comprehensiveness of assessment, safety, and versatility, failing to accurately meet the refined assessment needs of battery health status in practical applications. Therefore, developing an effectiveness verification scheme that is adaptable to different types and aging states of batteries, offers comprehensive assessment dimensions, is safe and reliable, and is highly versatile has become an urgent technical problem to be solved in the industry. Summary of the Invention

[0005] The purpose of this invention is to provide a method, system, storage medium, and product for verifying the effectiveness of a battery. The method involves first pre-treating the battery at a constant temperature of 25±2℃ and collecting basic parameters. Then, a baseline discharge current is set according to the battery type. The initial dynamic discharge current is determined by calculating a dynamic adjustment coefficient based on the number of cycles, voltage, and internal resistance. After collecting multi-dimensional data through three stages of testing—pre-discharge, main discharge, and pulse discharge—the effectiveness is comprehensively judged using two indicators: State of Health (SOH) and Capacity Decay Consistency Coefficient (γ). Finally, relevant data is associated and stored to form a verification archive. This invention solves the problems of difficulty in accurately assessing the health status and usability of batteries of different types and aging states, and the inability to quantify the consistency of individual cell performance within a battery pack, thus hindering decisions on normal use, downgrading, or replacement.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for verifying the effectiveness of a storage battery, characterized by comprising the following steps:

[0008] S1: Place the battery to be tested in a constant temperature environment of 25±2℃. After letting the battery stand for 24 hours, confirm that the battery terminals are securely connected, and then measure the initial open-circuit voltage of the battery using a multimeter. Record the rated capacity of the battery. Initial internal resistance at the time of manufacture and the number of charge-discharge cycles ;

[0009] S2: Set the reference discharge current based on the battery type. Calculate the dynamic discharge current adjustment coefficient Thus, the initial dynamic discharge current is determined. ;

[0010] S3: Based on the initial dynamic discharge current determined in step S2 The battery was subjected to a three-stage discharge test, including a pre-discharge stage, a main discharge stage, and a pulse discharge stage, with the discharge voltage of each stage being collected in real time. Discharge current Battery surface temperature and discharge time ;

[0011] S4: Based on the parameters collected in step S3, calculate the consistency coefficient between battery health status (SOH) and capacity decay. The effectiveness status of the battery is determined comprehensively.

[0012] S5: Include the battery model, initial parameters, discharge data at each stage, and the calculated battery health status (SOH) and capacity decay consistency coefficient. The results are associated with the final judgment and stored in the database to form a verification file.

[0013] Step S2 sets the reference discharge current based on the battery type. The specific rules are as follows: For lead-acid batteries, Values For lithium-ion batteries, Values Among them, ternary lithium batteries have a high risk of lithium plating, and the upper limit is controlled at [missing information]. The upper limit for lithium iron phosphate batteries is For nickel-metal hydride batteries, Values ;in This refers to the battery's rated capacity.

[0014] Step S2: Calculate the dynamic discharge current adjustment coefficient. Thus, the initial dynamic discharge current is determined. Specifically, this includes calculating the dynamic discharge current adjustment coefficient using the following formula. :

[0015] ;

[0016] In the formula, This is the dynamic discharge current adjustment coefficient; is a natural constant with a value of 2.71828; The cycle degradation coefficient is determined based on the battery material; for lead-acid batteries... Lithium-ion batteries ; This refers to the number of charge-discharge cycles the battery has undergone. The rated cycle life of the battery; This is the initial open-circuit voltage of the battery; This is the rated open-circuit voltage of the battery; This is the initial internal resistance of the battery when it leaves the factory. The current internal resistance of the battery is obtained using the AC impedance method.

[0017] Then determine the initial dynamic discharge current. The calculation formula is as follows:

[0018] ;

[0019] In the formula, This is the initial dynamic discharge current; This is the dynamic discharge current adjustment coefficient; The reference discharge current;

[0020] Step S3 is based on the initial dynamic discharge current determined in step S2. The battery was subjected to a three-stage discharge test, including a pre-discharge stage, a main discharge stage, and a pulse discharge stage, with the discharge voltage of each stage being collected in real time. Discharge current Battery surface temperature and discharge time Specifically, it includes the following steps:

[0021] S31: Pre-discharge stage, with initial dynamic discharge current Discharge for 5 minutes, and collect the voltage at the end of the discharge. and temperature ,like If the battery fails to discharge properly, it will enter the main discharge stage; otherwise, it will be determined that the battery has poor contact or initial thermal runaway risk, the verification will be terminated and marked as "pending repair".

[0022] S32: Main discharge stage, based on real-time data acquisition. and The discharge current is determined by dynamically adjusting the formula. Continue discharging until the battery voltage drops to the termination voltage. For lead-acid batteries Lithium-ion batteries Record the duration of the main discharge. The dynamic adjustment formula is as follows:

[0023] ;

[0024] In the formula: Real-time dynamic discharge current during the main discharge phase; This is the initial dynamic discharge current;

[0025] Pi, with a value of 3.14159; The cumulative discharge time during the main discharge phase; The theoretical maximum discharge time of the battery is calculated using the following formula: ; This is the rated open-circuit voltage of the battery; Real-time discharge voltage during the main discharge phase; This is the battery termination voltage for lead-acid batteries. Lithium-ion batteries ; It is a natural exponential function; This is a temperature correction factor, with a value of 0.02℃⁻¹; This refers to the real-time surface temperature of the battery. The constant temperature environment during the pretreatment stage is set to 25±2℃.

[0026] S33: During the pulse discharge phase, after the main discharge phase ends, allow the circuit to stand for 30 minutes and then collect the recovered open-circuit voltage. Then with 2 A pulsed current discharge was performed for 10 seconds, and the instantaneous voltage after the pulsed discharge was collected. Record the voltage drop during the pulse discharge process. , .

[0027] Step S4: Calculate the consistency coefficient between battery health status (SOH) and capacity degradation. The battery health status (SOH) is calculated using the following formula to comprehensively determine the battery's effectiveness:

[0028] ;

[0029] In the formula, For battery health; The actual amount of electricity discharged during the main discharge phase is determined by the real-time discharge current. During the main discharge time The integral within the range is calculated; The duration of the main discharge, i.e., from the start of the main discharge until the voltage drops to the termination voltage. The cumulative time; This refers to the rated capacity of the battery. This is the recovery open-circuit voltage before pulse discharge; This is the initial open-circuit voltage of the battery; This is the rated open-circuit voltage of the battery; This represents the voltage drop during the pulse discharge process; This is the instantaneous voltage after the pulse discharge.

[0030] In step S4, the consistency coefficient between battery health status (SOH) and capacity decay is calculated. The battery's effectiveness status is comprehensively determined by the capacity decay consistency coefficient. The calculation formula is as follows:

[0031] ;

[0032] In the formula, This is the capacity decay consistency coefficient; This refers to the number of individual batteries in the battery pack. For the first The health status of each individual battery cell; for The average health of each individual battery cell.

[0033] In step S4, the overall effectiveness status of the battery is determined, and the specific rules are as follows: If and The battery is determined to be "valid and usable"; if and The battery was determined to be "secondarily effective and can be downgraded for non-core applications"; if or The battery was determined to be "ineffective and needs to be replaced".

[0034] A battery effectiveness verification system, characterized in that it includes: a constant current discharge module, used to perform short-time constant current discharge and capacity discharge on the battery pack, and can dynamically adjust the discharge current according to the control signal;

[0035] The charging reverse blocking module consists of a reverse blocking diode D1 and a contactor KM1, which are connected in series with the battery pack. It is used to disconnect the battery pack from the charging module during the discharge process, prevent the charging current from flowing back into the discharge circuit, and at the same time maintain the battery pack's discharge conduction capability to the DC bus.

[0036] The data acquisition module includes a bus voltage acquisition unit, a single cell voltage acquisition unit, and a status acquisition unit. The bus voltage acquisition unit acquires the battery pack terminal voltage in real time. The single cell voltage acquisition unit obtains the voltage of each single cell by communicating with the wireless battery inspection instrument. The status acquisition unit acquires the battery surface temperature, contactor status, and discharge circuit on / off status.

[0037] The main control module is electrically connected to the constant current discharge module, the charging reverse stop module, and the data acquisition module, respectively. It has a built-in memory that stores instructions that can be executed by the at least one processor. When the instructions are executed by the at least one processor, the at least one processor performs the method as described in any one of claims 1 to 7.

[0038] The communication module includes a wired communication unit and a wireless communication unit. The wired communication unit is equipped with a USB data download interface, and the wireless communication unit establishes a communication link with the wireless battery inspection instrument to realize data interaction and control signal transmission.

[0039] The alarm and storage module is used to store discharge curves, test parameters and verification results. It has two output signals: battery failure alarm and equipment fault alarm. It also supports exporting test records to the background analysis software via USB interface.

[0040] A non-transitory computer-readable storage medium storing computer instructions that, when executed by at least one processor, cause the at least one processor to perform the method as described in any one of claims 1 to 7.

[0041] A computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform the method as described in any one of claims 1 to 7.

[0042] This battery effectiveness verification scheme achieves accurate assessment of battery health status and usability through core logic including environmental pretreatment, dynamic parameter adaptation, multi-stage discharge testing, dual-index comprehensive judgment, and closed-loop data storage. Its working mechanism is as follows:

[0043] First, the battery to be tested was placed in a constant temperature environment of 25±2℃ for 24 hours through environmental pretreatment to eliminate the influence of temperature fluctuations on the battery's electrochemical state. At the same time, the reliability of the electrode connection was confirmed, and basic parameters such as initial open circuit voltage, rated capacity, initial internal resistance at the factory, and number of cycles were collected to provide benchmark data support for subsequent tests.

[0044] Differentiated reference discharge currents are set based on the differences in battery type, and a dynamic discharge current adjustment coefficient k is introduced. This coefficient comprehensively considers the degree of battery cycle degradation, initial voltage matching degree and internal resistance change. The reference discharge current is dynamically corrected through a quantitative formula to form an initial dynamic discharge current that adapts to the actual aging state of the battery, avoiding test distortion or battery damage (such as the risk of lithium plating in lithium-ion batteries) caused by fixed discharge current.

[0045] The test then proceeds to three stages of discharge testing: The pre-discharge stage involves discharging for 5 minutes with an initial dynamic discharge current. Batteries with poor contact or initial thermal runaway risks are screened by detecting voltage and temperature changes after discharge, ensuring safety for subsequent tests. The main discharge stage uses real-time collected discharge voltage and surface temperature data, dynamically adjusting the discharge current to optimize it in real-time. This combines voltage decay trends with temperature correction coefficients to suppress current overload at high temperatures, continuously discharging until the cell termination voltage is reached, accurately capturing the battery's actual discharge capacity. The pulse discharge stage involves resting the battery after the main discharge to restore its open-circuit voltage, followed by a short-term discharge with twice the reference current. The voltage drop reflects the battery's instantaneous load response and internal resistance polarization characteristics, supplementing the performance evaluation dimensions of the main discharge stage.

[0046] After the test data is collected, the validity is determined through dual-index calculation: State of Health (SOH) integrates the actual discharge capacity during the main discharge phase, the stability of the recovered open-circuit voltage, and the pulse voltage drop, comprehensively reflecting the battery's energy storage and release capabilities; the capacity decay consistency coefficient γ assesses the performance matching degree of individual cells within the battery pack by calculating the dispersion of SOH in each cell. Based on the rule of "SOH ≥ 85% and γ ≤ 5%, normal use; 60% ≤ SOH < 85% and γ ≤ 8%, downgraded use; SOH < 60% or γ > 8%, replacement required," a clear judgment result is formed.

[0047] At the system level, the constant current discharge module performs dynamic current adjustment, the charging reverse protection module blocks reverse current to ensure circuit safety, the data acquisition module synchronously acquires multi-dimensional data such as bus / individual voltage, temperature, and circuit status, the main control module carries out parameter calculation and process control, and the communication and alarm storage module realizes data interaction, abnormal alarms, and test file retention to ensure the accuracy, security, and practicality of the evaluation results.

[0048] Compared with the prior art, the beneficial effects of the present invention are:

[0049] 1. Existing technologies mostly use fixed discharge currents for verification, which cannot be adapted to different types and aging states of batteries, easily leading to test distortion or battery damage. This invention sets differentiated benchmark discharge currents according to battery type, and calculates dynamic adjustment coefficients based on cycle number, initial / current internal resistance, and initial / rated open-circuit voltage to dynamically optimize the initial discharge current, ensuring that the discharge parameters accurately match the actual battery state. At the same time, during the main discharge stage, the current is further dynamically adjusted based on real-time voltage and temperature, effectively avoiding test deviations caused by fixed parameters, and the collected multi-dimensional data more closely reflects the actual performance of the battery.

[0050] 2. Existing technologies often focus solely on single indicators such as battery capacity, neglecting the impact of the consistency of individual cell performance within the battery pack on the overall performance. Furthermore, their evaluation dimensions are limited, lacking features such as instantaneous load response and safety risk prediction. This invention innovatively designs a three-stage discharge test: the pre-discharge stage screens for safety risks such as poor contact and initial thermal runaway; the main discharge stage accurately captures the actual discharge capacity; and the pulse discharge stage supplements the evaluation of instantaneous load response and internal resistance polarization characteristics. Simultaneously, it introduces a dual-indicator judgment system of State of Health (SOH) and Capacity Decay Consistency Coefficient γ, resolving the problems of one-sided evaluation and vague judgment criteria in existing technologies.

[0051] 3. Existing technologies lack a robust safety protection mechanism, making them susceptible to damage to testing equipment or battery risks due to reverse current and overload discharge; furthermore, test data is often stored in a scattered manner, hindering traceability. This invention uses a charging reverse-current prevention module to block the reverse flow of charging current during discharge, proactively identifying risks in the pre-discharge stage, and suppressing high-temperature overload during the main discharge stage through a temperature correction coefficient, comprehensively ensuring the safety of the testing process. Simultaneously, it is equipped with a communication module and an alarm storage module, supporting real-time acquisition, complete storage, USB export, and anomaly alarms of test data, forming a closed loop of "test-judgment-storage-traceability." Compared to existing technologies, this better meets the operational needs of practical application scenarios and facilitates subsequent equipment maintenance and data review.

[0052] 4. Existing technologies are mostly designed for specific types of batteries, resulting in poor compatibility and a lack of standardized computer implementation solutions. This invention covers mainstream battery types such as lead-acid, ternary lithium, lithium iron phosphate, and nickel-metal hydride, clearly defining key parameters such as reference discharge current and termination voltage for different battery types, adapting to multiple application scenarios. It also provides a supporting verification system, non-transitory computer-readable storage media, and computer program products, which can be quickly integrated into existing testing equipment or maintenance systems. This solves the problems of insufficient versatility and high implementation difficulty of existing technologies, significantly reducing the technical threshold and application cost of battery effectiveness verification. Attached Figure Description

[0053] Figure 1 This is a flowchart of a battery effectiveness verification method according to the present invention;

[0054] Figure 2 This is a schematic diagram of a battery effectiveness verification system according to the present invention. Detailed Implementation

[0055] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings.

[0056] like Figure 1-2 As shown, a method for verifying the effectiveness of a storage battery is characterized by comprising the following steps:

[0057] S1: Place the battery to be tested in a constant temperature environment of 25±2℃. After letting the battery stand for 24 hours, confirm that the battery terminals are securely connected, and then measure the initial open-circuit voltage of the battery using a multimeter. Record the rated capacity of the battery. Initial internal resistance at the time of manufacture and the number of charge-discharge cycles ;

[0058] S2: Set the reference discharge current based on the battery type. Calculate the dynamic discharge current adjustment coefficient Thus, the initial dynamic discharge current is determined. ;

[0059] S3: Based on the initial dynamic discharge current determined in step S2 The battery was subjected to a three-stage discharge test, including a pre-discharge stage, a main discharge stage, and a pulse discharge stage, with the discharge voltage of each stage being collected in real time. Discharge current Battery surface temperature and discharge time ;

[0060] S4: Based on the parameters collected in step S3, calculate the consistency coefficient between battery health status (SOH) and capacity decay. The effectiveness status of the battery is determined comprehensively.

[0061] S5: Include the battery model, initial parameters, discharge data at each stage, and the calculated battery health status (SOH) and capacity decay consistency coefficient. The results are associated with the final judgment and stored in the database to form a verification file.

[0062] Step S2 sets the reference discharge current based on the battery type. The specific rules are as follows: For lead-acid batteries, Values For lithium-ion batteries, Values Among them, ternary lithium batteries have a high risk of lithium plating, and the upper limit is controlled at [missing information]. The upper limit for lithium iron phosphate batteries is For nickel-metal hydride batteries, Values ;in This refers to the battery's rated capacity.

[0063] Step S2: Calculate the dynamic discharge current adjustment coefficient. Thus, the initial dynamic discharge current is determined. Specifically, this includes calculating the dynamic discharge current adjustment coefficient using the following formula. :

[0064] ;

[0065] In the formula, This is the dynamic discharge current adjustment coefficient; is a natural constant with a value of 2.71828; The cycle degradation coefficient is determined based on the battery material; for lead-acid batteries... Lithium-ion batteries ; This refers to the number of charge-discharge cycles the battery has undergone. The rated cycle life of the battery; This is the initial open-circuit voltage of the battery; This is the rated open-circuit voltage of the battery; This is the initial internal resistance of the battery when it leaves the factory. The current internal resistance of the battery is obtained using the AC impedance method.

[0066] Then determine the initial dynamic discharge current. The calculation formula is as follows:

[0067] ;

[0068] In the formula, This is the initial dynamic discharge current; This is the dynamic discharge current adjustment coefficient; The reference discharge current;

[0069] Step S3 is based on the initial dynamic discharge current determined in step S2. The battery was subjected to a three-stage discharge test, including a pre-discharge stage, a main discharge stage, and a pulse discharge stage, with the discharge voltage of each stage being collected in real time. Discharge current Battery surface temperature and discharge time Specifically, it includes the following steps:

[0070] S31: Pre-discharge stage, with initial dynamic discharge current Discharge for 5 minutes, and collect the voltage at the end of the discharge. and temperature ,like If the battery fails to discharge properly, it will enter the main discharge stage; otherwise, it will be determined that the battery has poor contact or initial thermal runaway risk, the verification will be terminated and marked as "pending repair".

[0071] S32: Main discharge stage, based on real-time data acquisition. and The discharge current is determined by dynamically adjusting the formula. Continue discharging until the battery voltage drops to the termination voltage. For lead-acid batteries Lithium-ion batteries Record the duration of the main discharge. The dynamic adjustment formula is as follows:

[0072] ;

[0073] In the formula: Real-time dynamic discharge current during the main discharge phase; This is the initial dynamic discharge current;

[0074] Pi, with a value of 3.14159; The cumulative discharge time during the main discharge phase; The theoretical maximum discharge time of the battery is calculated using the following formula: ; This is the rated open-circuit voltage of the battery; Real-time discharge voltage during the main discharge phase; This is the battery termination voltage for lead-acid batteries. Lithium-ion batteries ; It is a natural exponential function; This is a temperature correction factor, with a value of 0.02℃. -1 ; This refers to the real-time surface temperature of the battery. The constant temperature environment during the pretreatment stage is set to 25±2℃.

[0075] S33: During the pulse discharge phase, after the main discharge phase ends, allow the circuit to stand for 30 minutes and then collect the recovered open-circuit voltage. Then with 2 A pulsed current discharge was performed for 10 seconds, and the instantaneous voltage after the pulsed discharge was collected. Record the voltage drop during the pulse discharge process. , .

[0076] Step S4: Calculate the consistency coefficient between battery health status (SOH) and capacity degradation. The battery health status (SOH) is calculated using the following formula to comprehensively determine the battery's effectiveness:

[0077] ;

[0078] In the formula, For battery health; The actual amount of electricity discharged during the main discharge phase is determined by the real-time discharge current. During the main discharge time The integral within the range is calculated; The duration of the main discharge, i.e., from the start of the main discharge until the voltage drops to the termination voltage. The cumulative time; This refers to the rated capacity of the battery. This is the recovery open-circuit voltage before pulse discharge; This is the initial open-circuit voltage of the battery; This is the rated open-circuit voltage of the battery; This represents the voltage drop during the pulse discharge process; This is the instantaneous voltage after the pulse discharge.

[0079] In step S4, the consistency coefficient between battery health status (SOH) and capacity decay is calculated. The battery's effectiveness status is comprehensively determined by the capacity decay consistency coefficient. The calculation formula is as follows:

[0080] ;

[0081] In the formula, This is the capacity decay consistency coefficient; This refers to the number of individual batteries in the battery pack. For the first The health status of each individual battery cell; for The average health of each individual battery cell.

[0082] In step S4, the overall effectiveness status of the battery is determined, and the specific rules are as follows: If and The battery is determined to be "valid and usable"; if and The battery was determined to be "secondarily effective and can be downgraded for non-core applications"; if or The battery was determined to be "ineffective and needs to be replaced".

[0083] A battery effectiveness verification system, characterized in that it includes: a constant current discharge module, used to perform short-time constant current discharge and capacity discharge on the battery pack, and can dynamically adjust the discharge current according to the control signal;

[0084] The charging reverse blocking module consists of a reverse blocking diode D1 and a contactor KM1, which are connected in series with the battery pack. It is used to disconnect the battery pack from the charging module during the discharge process, prevent the charging current from flowing back into the discharge circuit, and at the same time maintain the battery pack's discharge conduction capability to the DC bus.

[0085] The data acquisition module includes a bus voltage acquisition unit, a single cell voltage acquisition unit, and a status acquisition unit. The bus voltage acquisition unit acquires the battery pack terminal voltage in real time. The single cell voltage acquisition unit obtains the voltage of each single cell by communicating with the wireless battery inspection instrument. The status acquisition unit acquires the battery surface temperature, contactor status, and discharge circuit on / off status.

[0086] The main control module is electrically connected to the constant current discharge module, the charging reverse stop module, and the data acquisition module, respectively. It has a built-in memory that stores instructions that can be executed by the at least one processor. When the instructions are executed by the at least one processor, the at least one processor performs the method as described in any one of claims 1 to 7.

[0087] The communication module includes a wired communication unit and a wireless communication unit. The wired communication unit is equipped with a USB data download interface, and the wireless communication unit establishes a communication link with the wireless battery inspection instrument to realize data interaction and control signal transmission.

[0088] The alarm and storage module is used to store discharge curves, test parameters and verification results. It has two output signals: battery failure alarm and equipment fault alarm. It also supports exporting test records to the background analysis software via USB interface.

[0089] A non-transitory computer-readable storage medium storing computer instructions that, when executed by at least one processor, cause the at least one processor to perform the method as described in any one of claims 1 to 7.

[0090] A computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform the method as described in any one of claims 1 to 7.

[0091] Example 1 uses a lithium iron phosphate battery with a rated capacity of 100Ah, an initial factory internal resistance of 30mΩ, a rated cycle life of 1500 cycles, and a rated open-circuit voltage of 3.2V. This battery has already undergone 500 charge-discharge cycles. After being placed in a constant temperature environment at 25℃ for 24 hours to ensure secure electrode connections, the initial open-circuit voltage was measured to be 3.3V using a multimeter. The current internal resistance was measured to be 35mΩ using the AC impedance method. Based on the characteristics of the lithium iron phosphate battery, a reference discharge current of 0.3Cn (30A) was set. Combining this with a cycle decay coefficient of 0.001 and other parameters, a dynamic discharge current adjustment coefficient of 0.92 was calculated, thus determining the initial dynamic discharge current to be 27.6A. A 5-minute pre-discharge was performed using the initial dynamic discharge current. After the pre-discharge, the voltage was measured at 3.25V and the temperature at 27℃, with a temperature difference of 2℃, which met the requirements. The main discharge stage was successfully entered. During the main discharge, the discharge current was dynamically adjusted between 25 and 28A based on the real-time voltage and temperature data. The discharge continued until the voltage dropped to 2.75V and then stopped. The duration of the main discharge was recorded as 3.8 hours. After a 30-minute rest period, the open-circuit voltage was measured to be 3.1V. Then, a 60A pulse current was used to discharge for 10 seconds, and the instantaneous voltage was measured to be 2.9V, with a voltage drop of 0.2V. The battery's health level was calculated to be 93% based on the 95Ah of electricity actually discharged during the main discharge phase and related voltage parameters. If the battery pack consists of 3 individual cells with health levels of 93%, 92%, and 94% respectively, an average of 93%, and a capacity decay consistency coefficient of 0.8%, the battery is deemed effective and usable according to the judgment rules. Finally, the battery model, initial parameters, discharge data at each stage, health level of 93%, capacity decay consistency coefficient of 0.8%, and final judgment result are associated and stored in the database to form a complete verification file.

Claims

1. A method for verifying the effectiveness of a storage battery, characterized in that, Includes the following steps: S1: Place the battery to be tested in a constant temperature environment of 25±2℃. After letting the battery stand for 24 hours, confirm that the battery terminals are securely connected, and then measure the initial open-circuit voltage of the battery using a multimeter. Record the rated capacity of the battery. Initial internal resistance at the time of manufacture and the number of charge-discharge cycles ; S2: Set the reference discharge current based on the battery type. Calculate the dynamic discharge current adjustment coefficient Thus, the initial dynamic discharge current is determined. ; S3: Based on the initial dynamic discharge current determined in step S2 The battery was subjected to a three-stage discharge test, including a pre-discharge stage, a main discharge stage, and a pulse discharge stage, with the discharge voltage of each stage being collected in real time. Discharge current Battery surface temperature and discharge time ; S4: Based on the parameters collected in step S3, calculate the consistency coefficient between battery health status (SOH) and capacity decay. The effectiveness status of the battery is determined comprehensively. S5: Include the battery model, initial parameters, discharge data at each stage, and the calculated battery health status (SOH) and capacity decay consistency coefficient. The results are associated with the final judgment and stored in the database to form a verification file.

2. The battery effectiveness verification method according to claim 1, characterized in that, Step S2 sets the reference discharge current based on the battery type. The specific rules are as follows: For lead-acid batteries, Values For lithium-ion batteries, Values Among them, ternary lithium batteries have a high risk of lithium plating, and the upper limit is controlled at [missing information]. The upper limit for lithium iron phosphate batteries is For nickel-metal hydride batteries, Values ;in This refers to the battery's rated capacity.

3. The battery effectiveness verification method according to claim 2, characterized in that, Step S2: Calculate the dynamic discharge current adjustment coefficient. Thus, the initial dynamic discharge current is determined. Specifically, this includes calculating the dynamic discharge current adjustment coefficient using the following formula. : ； In the formula, This is the dynamic discharge current adjustment coefficient; is a natural constant with a value of 2.71828; The cycle degradation coefficient is determined based on the battery material; for lead-acid batteries... Lithium-ion batteries ; This refers to the number of charge-discharge cycles the battery has undergone. The rated cycle life of the battery; This is the initial open-circuit voltage of the battery; This is the rated open-circuit voltage of the battery; This is the initial internal resistance of the battery when it leaves the factory. The current internal resistance of the battery is obtained using the AC impedance method. Then determine the initial dynamic discharge current. The calculation formula is as follows: ； In the formula, This is the initial dynamic discharge current; This is the dynamic discharge current adjustment coefficient; The reference discharge current is used.

4. The battery effectiveness verification method according to claim 1, characterized in that, Step S3 is based on the initial dynamic discharge current determined in step S2. The battery was subjected to a three-stage discharge test, including a pre-discharge stage, a main discharge stage, and a pulse discharge stage, with the discharge voltage of each stage being collected in real time. Discharge current Battery surface temperature and discharge time Specifically, it includes the following steps: S31: Pre-discharge stage, with initial dynamic discharge current Discharge for 5 minutes, and collect the voltage at the end of the discharge. and temperature ,like If the battery fails to discharge properly, it will enter the main discharge stage; otherwise, it will be determined that the battery has poor contact or initial thermal runaway risk, the verification will be terminated and marked as "pending repair". S32: Main discharge stage, based on real-time data acquisition. and The discharge current is determined by dynamically adjusting the formula. Continue discharging until the battery voltage drops to the termination voltage. For lead-acid batteries Lithium-ion batteries Record the duration of the main discharge. The dynamic adjustment formula is as follows: ； In the formula: Real-time dynamic discharge current during the main discharge phase; This is the initial dynamic discharge current; Pi, with a value of 3.14159; The cumulative discharge time during the main discharge phase; The theoretical maximum discharge time of the battery is calculated using the following formula: ; This is the rated open-circuit voltage of the battery; Real-time discharge voltage during the main discharge phase; This is the battery termination voltage for lead-acid batteries. Lithium-ion batteries ; It is a natural exponential function; This is a temperature correction factor, with a value of 0.02℃⁻¹; This refers to the real-time surface temperature of the battery. The constant temperature environment during the pretreatment stage is set to 25±2℃. S33: During the pulse discharge phase, after the main discharge phase ends, allow the circuit to stand for 30 minutes and then collect the recovered open-circuit voltage. Then with 2 A pulsed current discharge was performed for 10 seconds, and the instantaneous voltage after the pulsed discharge was collected. Record the voltage drop during the pulse discharge process. , .

5. The battery effectiveness verification method according to claim 1, characterized in that, Step S4: Calculate the consistency coefficient between battery health status (SOH) and capacity degradation. The battery health status (SOH) is calculated using the following formula to comprehensively determine the battery's effectiveness: ； In the formula, For battery health; The actual amount of electricity discharged during the main discharge phase is determined by the real-time discharge current. During the main discharge time The integral within the range is calculated; The duration of the main discharge, i.e., from the start of the main discharge until the voltage drops to the termination voltage. The cumulative time; This refers to the rated capacity of the battery. This is the recovery open-circuit voltage before pulse discharge; This is the initial open-circuit voltage of the battery; This is the rated open-circuit voltage of the battery; This represents the voltage drop during the pulse discharge process; This is the instantaneous voltage after the pulse discharge.

6. The battery effectiveness verification method according to claim 1, characterized in that, In step S4, the consistency coefficient between battery health status (SOH) and capacity decay is calculated. The battery's effectiveness status is comprehensively determined by the capacity decay consistency coefficient. The calculation formula is as follows: ； In the formula, This is the capacity decay consistency coefficient; This refers to the number of individual batteries in the battery pack. For the first The health status of each individual battery cell; for The average health of each individual battery cell.

7. The battery effectiveness verification method according to claim 1, characterized in that, In step S4, the overall effectiveness status of the battery is determined, and the specific rules are as follows: If and The battery is determined to be "valid and usable"; if and The battery was determined to be "secondarily effective and can be downgraded for non-core applications"; if or The battery was determined to be "ineffective and needs to be replaced".

8. A battery effectiveness verification system, characterized in that, include: The constant current discharge module is used to perform short-time constant current discharge and capacity discharge of the battery pack, and can dynamically adjust the discharge current according to the control signal. The charging reverse blocking module consists of a reverse blocking diode D1 and a contactor KM1, which are connected in series with the battery pack. It is used to disconnect the battery pack from the charging module during the discharge process, prevent the charging current from flowing back into the discharge circuit, and at the same time maintain the battery pack's discharge conduction capability to the DC bus. The data acquisition module includes a bus voltage acquisition unit, a single cell voltage acquisition unit, and a status acquisition unit. The bus voltage acquisition unit acquires the battery pack terminal voltage in real time. The single cell voltage acquisition unit obtains the voltage of each single cell by communicating with the wireless battery inspection instrument. The status acquisition unit acquires the battery surface temperature, contactor status, and discharge circuit on / off status. The main control module is electrically connected to the constant current discharge module, the charging reverse stop module, and the data acquisition module, respectively. It has a built-in memory that stores instructions that can be executed by the at least one processor. When the instructions are executed by the at least one processor, the at least one processor performs the method as described in any one of claims 1 to 7. The communication module includes a wired communication unit and a wireless communication unit. The wired communication unit is equipped with a USB data download interface, and the wireless communication unit establishes a communication link with the wireless battery inspection instrument to realize data interaction and control signal transmission. The alarm and storage module is used to store discharge curves, test parameters and verification results. It has two output signals: battery failure alarm and equipment fault alarm. It also supports exporting test records to the background analysis software via USB interface.

9. A non-transitory computer-readable storage medium storing computer instructions that, when executed by at least one processor, cause the at least one processor to perform the method as described in any one of claims 1 to 7.

10. A computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform the method as described in any one of claims 1 to 7.

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