Battery pulse power determination method, equipment and storage medium

Abstract

This application provides a method, device, and storage medium for determining battery pulse power. The method includes: determining that the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time is within a preset cutoff voltage range; performing an RPT test and a preset number of charge-discharge tests on the battery to obtain the current battery performance degradation rate; determining whether the current battery performance degradation rate is within a normal range; if so, using the preset pulse power as the target pulse power; otherwise, performing a first power derating on the preset pulse power and returning to the steps of performing the RPT test and the preset number of charge-discharge tests according to the preset pulse time, until the target pulse power is obtained. The method of this application can determine the pulse power of the energy storage battery within a preset time, ensuring that the pulse power does not have an additional negative impact on battery degradation and guaranteeing the normal application of the battery throughout its entire lifespan.

Description

Technical Field

[0001] This application relates to the field of energy storage battery technology, and in particular to a method, device and storage medium for determining battery pulse power. Background Technology

[0002] The implementation of the "dual carbon" target has greatly promoted the rapid development of electrochemical energy storage systems, primarily based on secondary batteries such as lithium-ion and sodium-ion batteries. With the advancement of energy storage system technology, its application scenarios have diversified, with frequency regulation being a crucial one. Both frequency regulation applications and battery management systems involve issues related to battery-related pulse power values.

[0003] In current methods, the pulse power of the battery can easily reduce battery life, and it is difficult to determine a pulse power that will not affect the battery's lifespan.

[0004] This invention provides a method, device, and storage medium for determining battery pulse power. The pulse power determined by this method will not have an additional negative effect on battery degradation, and can ensure the normal application of the battery throughout its entire life cycle. Summary of the Invention

[0005] This application provides a method, device, and storage medium for determining battery pulse power, which can determine the pulse power of an energy storage battery within a preset pulse time, so that the pulse power will not have an additional negative effect on battery degradation, and can ensure the normal application of the battery throughout its entire life cycle.

[0006] In a first aspect, this application provides a method for determining battery pulse power, including:

[0007] Ensure that the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time is within a preset cutoff voltage range;

[0008] The battery is subjected to an RPT test, and a preset number of charge-discharge tests are performed according to the preset pulse time to obtain the average temperature of the battery and the current battery performance degradation rate.

[0009] Determine whether the current battery performance degradation rate is within the normal range;

[0010] If so, the preset pulse power is used as the target pulse power, wherein running within the preset pulse time and the target pulse power does not affect the battery's lifespan.

[0011] If not, then a first power derating is applied to the preset pulse power, and after the first power derating, the process returns to performing the RPT test on the battery and the charge-discharge test for a preset number of times according to the preset pulse time, until the target pulse power is obtained. In one possible design, the dynamic voltage of the battery during charging and discharging at the preset pulse power within the preset pulse time is within a preset cutoff voltage range, including:

[0012] Obtain the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time;

[0013] Determine whether the dynamic voltage is within the preset cutoff voltage range;

[0014] If so, then the dynamic voltage is determined to be within the preset cutoff voltage range;

[0015] If not, the preset pulse power is derating in the second way, and then the dynamic voltage is reacquired until the dynamic voltage is within the preset cutoff voltage range.

[0016] In one possible design, determining whether the dynamic voltage is within the preset cutoff voltage range includes:

[0017] The preset pulse power is the preset pulse charging power, and the preset cutoff voltage is the preset charging cutoff voltage. If the dynamic voltage is less than the preset charging cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not less than the preset charging cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

[0018] The preset pulse power is the preset pulse discharge power, and the preset cutoff voltage is the preset discharge cutoff voltage. If the dynamic voltage is greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

[0019] In one possible design, after the preset pulse power is dated a second time, the dynamic voltage is reacquired until the dynamic voltage is within the preset cutoff voltage range, including:

[0020] A new preset pulse power is obtained by multiplying the preset pulse power by the second derating factor;

[0021] Based on the new preset pulse power, the dynamic voltage is reacquired until the dynamic voltage is within the preset cutoff voltage range. The second derating factor is the ratio of the actual charging time of the battery to the preset pulse time, or the ratio of the actual discharging time of the battery to the preset pulse time.

[0022] In one possible design, performing an RPT test on the battery, which involves conducting a preset number of charge-discharge tests based on the preset pulse time, to obtain the battery's average temperature and current battery performance degradation rate, includes:

[0023] The battery is subjected to a first RPT test under a preset SOE to obtain a first battery health status.

[0024] The battery is subjected to a preset number of charge-discharge tests under a preset SOE, and the average temperature and cumulative charge-discharge capacity of the battery are obtained.

[0025] The battery is subjected to a second RPT test under a preset SOE to obtain a second battery health status.

[0026] The current battery performance degradation rate is calculated based on the difference between the first battery health status and the second battery health status, and the cumulative charge and discharge capacity.

[0027] In one possible design, the charge-discharge test is as follows:

[0028] Adjust the battery to a preset SOE, and charge / discharge it according to the preset pulse power and the preset pulse time;

[0029] The battery is compensated with the same amount of charge at its rated power.

[0030] In one possible design, determining whether the current battery performance degradation rate is within the normal range includes:

[0031] The normal degradation rate is calculated based on the battery health at different temperatures, a temperature-normal degradation rate curve is fitted, and the normal degradation rate at the average temperature is calculated based on the fitted curve.

[0032] If the current battery performance degradation rate is not greater than the normal degradation rate, then the current battery performance degradation rate is determined to be within the normal range; otherwise, the current battery performance degradation rate is determined to be outside the normal range.

[0033] In one possible design, the first power derating of the preset pulse power includes:

[0034] A new preset pulse power is obtained by multiplying the preset pulse power by the first derating factor; wherein the first derating factor is the ratio of the normal degradation rate to the current battery performance degradation rate.

[0035] Secondly, this application provides a battery pulse power determination device, comprising:

[0036] The first module is used to determine whether the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time is within a preset cutoff voltage range.

[0037] The second module is used to perform RPT testing on the battery, and to perform a preset number of charge and discharge tests according to the preset pulse time to obtain the average temperature of the battery and the current battery performance degradation rate.

[0038] The third module is used to determine whether the current battery performance degradation rate is within the normal range;

[0039] The fourth module is used to take the preset pulse power as the target pulse power if the current battery performance degradation rate is within the normal range, wherein running within the preset pulse time and the target pulse power does not affect the battery's life cycle;

[0040] The fifth module is used to perform a first power derating on the preset pulse power if the current battery performance degradation rate is not within the normal range, and after derating, return to the step of determining that the dynamic voltage of the battery during charging and discharging under the preset pulse power is within the preset cutoff voltage range, until the target pulse power is obtained.

[0041] Thirdly, this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0042] The memory stores computer-executed instructions;

[0043] The processor executes computer execution instructions stored in the memory to implement a method for determining battery pulse power.

[0044] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement a battery pulse power determination method.

[0045] The battery pulse power determination method, device, and storage medium provided in this application, through preset pulse power and dynamic voltage testing and rectified attenuation rate testing under the preset pulse power, and by continuously judging and adjusting the preset pulse power, finally obtains a target pulse power, wherein the battery's life cycle is not affected when the battery operates within the preset pulse time and target pulse power; achieving the following technical effects:

[0046] This application directly employs a power testing method to measure the dynamic voltage of the battery during charging and discharging under a preset pulse power and within a preset pulse time. This ensures the dynamic voltage remains within a preset cutoff voltage range, making the measurement more direct and better suited to application scenarios. Based on the battery's degradation characteristics, an RPT test is performed, followed by a preset number of charge-discharge tests within a preset pulse time to obtain the battery's average temperature and current performance degradation rate. The application then determines whether the current battery performance degradation rate is within the normal range. If so, the preset pulse power is used as the target pulse power; otherwise, the preset pulse power needs to be adjusted and the determination repeated until the target pulse power is obtained. This method can assess the pulse capability throughout the battery's entire lifespan and verify the impact of the pulse power on battery lifespan, ensuring that the obtained pulse power does not affect the normal use of the battery. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A flowchart illustrating a battery pulse power determination method provided in this application embodiment. Figure 1 ;

[0049] Figure 2 A flowchart illustrating a battery pulse power determination method provided in this application embodiment. Figure 2 ;

[0050] Figure 3 This is a schematic diagram of the structure of a battery pulse power determination device provided in an embodiment of this application;

[0051] Figure 4 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0052] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0053] It should be noted that, in the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0054] The following describes in detail, with reference to the accompanying drawings, a method for determining battery pulse power according to an embodiment of this application. It should be noted that the phrase "at...time" in the embodiments of this application can refer to the instant at which a certain situation occurs, or to a period of time after the occurrence of a certain situation; the embodiments of this application do not specifically limit this.

[0055] First, the relevant concepts or terms involved in this application will be explained:

[0056] State of Energy (SOE): The percentage of remaining energy in a battery, used to measure the remaining energy of the battery.

[0057] Battery health (State of Health, SOH): The state of health is the percentage of the battery's current capacity relative to its factory capacity.

[0058] RPT (Reference Performance Test): This is a test of the battery's initial charge and discharge energy. The specific steps are as follows:

[0059] 1) Let it stand at (25±2)℃ for 5 hours;

[0060] 2) Charge each battery cell at its rated constant power to the charging cut-off voltage of the battery cell, and let it stand for 30 minutes;

[0061] 3) Discharge the battery cell at its rated constant power to the discharge termination voltage of the battery cell, and let it stand for 30 minutes;

[0062] 4) Charge each battery cell at its rated constant power to the charging cut-off voltage of the battery cell, and let it stand for 30 minutes.

[0063] 5) Discharge the battery cell at its rated constant power to the discharge termination voltage of the battery cell, and let it stand for 30 minutes;

[0064] 6) Repeat steps 4) to 5) twice, and use the average battery health value of the three tests as the result.

[0065] The method of this application can be adapted to different battery application scenarios, including but not limited to power battery applications and energy storage applications. According to the pulse requirements of the battery application scenario (i.e., within a preset pulse time), a target pulse power is determined, which can ensure that the battery will not experience a reduction in battery life due to pulse power when operating within the target pulse power under the required application scenario.

[0066] Figure 1 A schematic flowchart of a battery pulse power determination method provided in this application embodiment. Figure 1 .like Figure 1 As shown, the method includes:

[0067] S101. Determine that the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time is within a preset cutoff voltage range.

[0068] Specifically, a preset pulse time and pulse power are defined, where the preset pulse time is the maximum pulse time under the battery application scenario. The battery is then charged or discharged within the preset pulse time and at the preset pulse power: if the battery's application scenario is charging, charging is performed within the preset pulse time; if the battery's application scenario is discharging, discharging is performed within the preset pulse time.

[0069] The dynamic voltage is monitored throughout the entire process to ensure that it remains within the battery's cutoff voltage range. If the dynamic voltage is within the battery's cutoff voltage range, step S102 is executed; if the dynamic voltage is not within the battery's cutoff voltage range, the pulse power is adjusted downwards to obtain a new preset pulse power, and the charging or discharging is repeated while monitoring the dynamic voltage until it is ensured that the dynamic voltage remains within the battery's cutoff voltage range throughout the entire test, at which point step S102 is executed.

[0070] S102. Perform RPT test on the battery, and perform a preset number of charge and discharge tests according to the preset pulse time to obtain the average temperature of the battery and the current battery performance degradation rate.

[0071] Specifically, a preset SOE value is used to adjust the battery to the preset SOE state. First, a first RPT test is performed to obtain the first battery health. Then, repeated charge and discharge tests are performed to obtain the average temperature and cumulative charge and discharge capacity during the charge and discharge tests. Finally, a second RPT test is performed to obtain the second battery health. Based on the difference between the first battery health and the second battery health and the cumulative charge and discharge capacity, the battery performance degradation rate under the current application scenario can be calculated.

[0072] S103. Determine whether the current battery performance degradation rate is within the normal range;

[0073] Specifically, since battery performance degradation rate is closely related to battery temperature, and the degradation rate that a battery can withstand varies at different temperatures, this embodiment uses the normal battery performance degradation rate at the average temperature as the evaluation standard when judging the current temperature. If the current battery performance degradation rate is not greater than the normal battery performance degradation rate at the average temperature, then the current battery performance degradation rate is determined to be within the normal range; if the current battery performance degradation rate is less than the normal battery performance degradation rate at the average temperature, then the current battery performance degradation rate is determined to be outside the normal range.

[0074] S104. If so, the preset pulse power is used as the target pulse power; wherein, running within the preset pulse time and target pulse power does not affect the battery's life cycle.

[0075] Specifically, when it is determined that the current battery performance degradation rate is within the normal range, the preset pulse power is the target pulse power, which can ensure that the battery will not experience a reduction in battery life due to pulse power when operating within the target pulse power under the required application scenario (i.e., within the preset pulse time).

[0076] S105. If not, perform a first power derating on the preset pulse power, and return to S102 after derating until the target pulse power is obtained.

[0077] Specifically, when it is determined that the current battery performance degradation rate is not within the normal range, it is necessary to adjust the current battery performance degradation rate to meet the conditions within the normal range. In this embodiment, after readjusting the preset pulse power according to the correlation of degradation rate, the process returns to S102, that is, to recalculate and judge the current battery performance degradation rate until it is determined that the current battery performance degradation rate is within the normal range.

[0078] The method provided in this embodiment involves setting a preset pulse power and then performing dynamic voltage and rectified attenuation rate tests under that preset pulse power. By continuously judging and adjusting the preset pulse power, a target pulse power is finally obtained. The battery's lifespan is not affected when the battery operates within the preset pulse time and target pulse power range. The following technical effects are achieved:

[0079] This application directly employs a power testing method to measure the dynamic voltage of the battery during charging and discharging under a preset pulse power and within a preset pulse time. This ensures the dynamic voltage remains within a preset cutoff voltage range, making the measurement more direct and better suited to application scenarios. Based on the battery's degradation characteristics, an RPT test is performed, followed by a preset number of charge-discharge tests within a preset pulse time to obtain the battery's average temperature and current performance degradation rate. The application then determines whether the current battery performance degradation rate is within a normal range. If so, the preset pulse power is used as the target pulse power; otherwise, the preset pulse power needs to be adjusted and the determination repeated until the target pulse power is obtained. This method can assess the pulse capability throughout the battery's entire lifespan and verify the impact of the pulse power on battery lifespan, ensuring that the obtained pulse power does not affect the normal use of the battery. A specific embodiment is provided below to describe in detail one of the battery pulse power determination methods of this application.

[0080] Figure 2 A schematic flowchart of a battery pulse power determination method provided in this application embodiment. Figure 2 Taking a 280Ah lithium-ion battery for energy storage as an example, this battery has a rated capacity of 280Ah, a rated voltage of 3.2V, and a rated power of 448W. Based on the application scenario, the battery's pulse discharge power capability for 30 seconds at an ambient temperature of 30℃ and SOE of 50% needs to be determined. Figure 2 As shown, the method includes:

[0081] S201. Obtain the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time.

[0082] Specifically, a preset pulse time and pulse power are defined, where the preset pulse time is the maximum pulse time under the battery application scenario. The battery is charged or discharged within the preset pulse time and at the preset pulse power: if the battery application scenario is charging, charging is performed within the preset pulse time; if the battery application scenario is discharging, discharging is performed within the preset pulse time. Dynamic voltage is monitored throughout the entire process.

[0083] For example, in this embodiment, the discharge power capability of the battery is determined by a pulse of 30 seconds at an ambient temperature of 30°C and SOE of 50%. The preset pulse time is 30 seconds, and the initial value of the preset pulse power P1 is set to 896W. The battery is then discharged at an ambient temperature of 30°C, with a pulse power of 896W, for 30 seconds, and the dynamic voltage U1 is monitored and obtained in real time.

[0084] S202. Determine whether the dynamic voltage is within the preset cutoff voltage range. If so, confirm that the dynamic voltage is within the preset cutoff voltage range and execute S204.

[0085] Specifically, the preset pulse power is the preset pulse charging power, and the preset cutoff voltage is the preset charging cutoff voltage. If the dynamic voltage is less than the preset charging cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not less than the preset charging cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

[0086] The preset pulse power is the preset pulse discharge power, and the preset cutoff voltage is the preset discharge cutoff voltage. If the dynamic voltage of the preset discharge cutoff voltage is greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

[0087] For example, the preset pulse power is the preset pulse discharge power, the dynamic voltage is U1, and the cutoff discharge voltage is set to 2.5V. If U1 > 2.5V, then it is determined that the dynamic voltage is within the preset cutoff voltage range, and S204 is executed.

[0088] S203. If not, after performing a second power derating on the preset pulse power, return to execution 301 until it is determined that the dynamic voltage is within the preset cutoff voltage range.

[0089] Specifically, the preset pulse power is subject to a second power derating, which includes obtaining a new preset pulse power by multiplying the preset pulse power by the second derating coefficient.

[0090] Specifically, the second derating factor is the ratio of the actual battery charging time to the preset pulse time, or the ratio of the actual battery discharging time to the preset pulse time.

[0091] For example, the preset pulse power is the preset pulse discharge power, the preset cutoff voltage is the cutoff discharge voltage, the dynamic voltage is U1, and the cutoff discharge voltage is set to 2.5V. If U1≤2.5V, it is determined that the dynamic voltage is not within the preset cutoff voltage range. Then, the value of the preset pulse power P1 is reduced to obtain a new preset pulse power, and the process returns to S201 to re-obtain the dynamic voltage U1. Finally, S204 is executed after ensuring that U1>2.5V.

[0092] For example, the preset pulse power P1 can be reduced using a proportional gradient descent method. Here, a second power derating operation is used: if the preset pulse time is known to be 30s and the actual discharge time is 25s, then the new preset pulse power P1 新 =P1*25 / 30, where the second derating factor is the ratio of the actual battery discharge time to the preset pulse time.

[0093] S204. Perform RPT test on the battery and perform a preset number of charge and discharge tests according to the preset pulse time to obtain the average temperature of the battery and the current battery performance degradation rate.

[0094] Specifically, the battery undergoes a first RPT test under a preset SOE to obtain a first battery health level; the battery undergoes a preset number of charge-discharge tests under the preset SOE to obtain the average temperature and cumulative charge-discharge capacity of the battery; the battery undergoes a second RPT test under the preset SOE to obtain a second battery health level; and the current battery performance degradation rate is calculated based on the difference between the first and second battery health levels and the cumulative charge-discharge capacity.

[0095] Specifically, when the preset pulse power is the preset pulse discharge power and the preset cutoff voltage is the preset discharge cutoff voltage, the average temperature and cumulative discharge capacity of the battery are obtained by performing a preset number of charge-discharge tests under the preset SOE of the battery. When the preset pulse power is the preset pulse charging power and the preset cutoff voltage is the preset charging cutoff voltage, the average temperature and cumulative charging capacity of the battery are obtained by performing a preset number of charge-discharge tests under the preset SOE of the battery.

[0096] Specifically, the charge / discharge test includes: adjusting the battery to a preset SOE, charging / discharging according to a preset pulse power and preset pulse time; and then performing a compensation operation on the battery with the same capacity at the rated power.

[0097] Specifically, when the preset pulse power is the preset pulse discharge power and the preset cutoff voltage is the preset discharge cutoff voltage, the charge-discharge test at a preset number of cycles includes: setting the preset number of cycles, adjusting the battery to the preset SOE, and sequentially performing discharge at the preset pulse power for a preset pulse duration, maintaining a standstill for a preset pulse duration, performing a compensation operation with the same amount of charge at the rated power, and maintaining a standstill for a preset pulse duration. The compensation operation with the same amount of charge here refers to a charging operation at the rated power for a preset time. The preset time is calculated by multiplying the preset pulse time by the ratio of the preset pulse discharge power to the rated power.

[0098] Specifically, when the preset pulse power is the preset pulse charging power and the preset cutoff voltage is the preset charging cutoff voltage, the charge-discharge test at a preset number of cycles includes: setting the preset number of cycles, adjusting the battery to the preset SOE, and sequentially performing charging at the preset pulse power for one preset pulse time, maintaining a standstill for one preset pulse time, performing a compensation operation with the same amount of charge at the rated power, and maintaining a standstill for one preset pulse time. Here, the compensation operation with the same amount of charge refers to performing a discharge operation at the rated power for a preset time. The preset time is calculated by multiplying the preset pulse time by the ratio of the preset pulse charging power to the rated power.

[0099] For example, when the battery has a preset SOE of 50% and a preset pulse discharge power P1 of 896W, a first RPT test is performed, and the first battery health SOE is obtained as 100%.

[0100] The battery was subjected to a pulse discharge of 896W for 30 seconds, followed by a 30-second rest period, and then a rated power of P. 额 Under the test conditions of charging at 448W for 60 seconds and discharging at rest for 30 seconds, with a preset number of cycles of 30,000, the average temperature during charging and discharging was obtained at 35℃, and the cumulative discharge capacity E was obtained. 放 =224000Wh; of which the rated power P 额 The compensation time T2 at 448W is calculated using the following formula: T2=t1*P1 / P 额 =30*896 / 448=60s, where t1 is the preset pulse time.

[0101] The second RPT test was then conducted, and the second battery health status (SOH2) was obtained as 99.6864%.

[0102] The calculated battery performance degradation rate K1 = 1.4 * 10 -6 % / Wh, i.e., K1 = △SOH1 / E 放 =(100%-99.6864%) / 224000Wh=1.4*10 -6 % / Wh, where △SOH1 is the difference between the health status of the first battery SOH1 and the health status of the second battery SOH2.

[0103] S205. Determine whether the current battery performance degradation rate is not greater than the normal degradation rate;

[0104] Specifically, since battery performance degradation rate is closely related to battery temperature, and the degradation rate that a battery can withstand varies at different temperatures, this embodiment uses the normal battery performance degradation rate at the average temperature as the evaluation standard when judging the current temperature. If the current battery performance degradation rate is not greater than the normal battery performance degradation rate at the average temperature, then the current battery performance degradation rate is determined to be within the normal range; if the current battery performance degradation rate is less than the normal battery performance degradation rate at the average temperature, then the current battery performance degradation rate is determined to be outside the normal range.

[0105] Specifically, the normal degradation rate is calculated as follows: the normal degradation rate is calculated based on the battery health at different temperatures, the temperature-normal degradation rate curve is fitted, and the normal degradation rate at the average temperature is calculated based on the fitted curve.

[0106] Specifically, the normal degradation rate is calculated as follows: by sampling and testing the battery health SOH3 at different temperatures T1, the normal degradation rate at the corresponding temperature is calculated using the following formula: K 正常 = (1-SOH3) / T1. In this embodiment, the normal decay rate at different temperatures is first calculated, and then the temperature-normal decay rate curve is fitted. According to the number of samplings and the sampling results, the corresponding linear or nonlinear function can be selected for fitting. The normal decay rate at the average temperature can be calculated through the temperature-normal decay rate curve, and this can be used as the basis for judging whether the current battery performance decay rate is within the normal range.

[0107] For example, the normal degradation rate K at a battery body temperature of 25°C is obtained through sampling tests and calculations. 正常 1*10 -6 % / Wh, normal decay rate K at 45℃ 正常 2*10 -6 % / Wh, the temperature-normal decay rate curve obtained by linear interpolation is: K 正常 = (5*T1-25)*10 -8 % / Wh, the average temperature calculated in S204 is 35℃. Substituting T1 = 35℃ into the above formula, we get that the normal degradation rate of this battery at an average temperature of 35℃ is 1.5*10. -6 % / Wh.

[0108] S206. If the current battery performance degradation rate is not greater than the normal degradation rate, then the current battery performance degradation rate is determined to be within the normal range. Then the preset pulse power is used as the target pulse power. The battery life cycle is not affected when running within the preset pulse time and target pulse power.

[0109] For example, the normal degradation rate of this battery is K. 正常 1.5*10-6 % / Wh, the battery performance degradation rate K1 = 1.4 * 10 -6 % / Wh, mix K1 and K 正常 Compare the results; K1 < K 正常 The preset pulse power of 896W is the target pulse power. This means that in the application scenario of pulse discharge of 30s at an ambient temperature of 30℃ and SOE of 50%, the battery's life cycle will not be affected if the pulse power is kept within 896W.

[0110] S207. If the current battery performance degradation rate is greater than the normal degradation rate, it is determined that the current battery performance degradation rate is not within the normal range. Then, the preset pulse power is derated first and the process returns to S204 until the current battery performance degradation rate is not greater than the normal degradation rate, and the target pulse power is obtained.

[0111] Specifically, the preset pulse power is derating by a first power factor, which includes: obtaining a new preset pulse power by multiplying the preset pulse power by a first derating factor; wherein the first derating factor is the ratio of the normal decay rate to the current battery performance decay rate.

[0112] Specifically, a proportional gradient descent method can also be used to reduce the preset pulse power P1 to obtain a new value. Here, the first power derating operation is used, and the formula is P1. 新 =P1*K 正常 / K1, where P1 新 For the new preset pulse power, K 正常 / K1 is the ratio of the normal degradation rate to the current battery performance degradation rate, i.e., the first derating factor; return to S204, re-perform the RPT test on the battery according to the new preset pulse power, perform a preset number of charge and discharge tests according to the preset pulse time, obtain the average temperature of the battery and the current battery performance degradation rate, and make a judgment until the current battery performance degradation rate is not greater than the normal degradation rate, and obtain the target pulse power.

[0113] The method provided in this embodiment involves setting a preset pulse power and then performing dynamic voltage and rectified attenuation rate tests under that preset pulse power. By continuously judging and adjusting the preset pulse power, a target pulse power is finally obtained. The battery's lifespan is not affected when the battery operates within the preset pulse time and target pulse power range. The following technical effects are achieved:

[0114] This application directly adopts a power testing method to directly measure the dynamic voltage of the battery during charging and discharging under a preset pulse power and within a preset pulse time, and determines whether the dynamic voltage is within the preset cutoff voltage range. If it is, the dynamic voltage is determined to be within the preset cutoff voltage range; if not, the preset pulse power is derated and the dynamic voltage is measured and judged again until it is determined that the dynamic voltage is within the preset cutoff voltage range. The measurement method of this application is more direct and better meets the needs of the application scenario.

[0115] This application, based on the battery's degradation characteristics, performs RPT testing on the battery and conducts a preset number of charge-discharge tests according to a preset pulse time to obtain the battery's average temperature and current battery performance degradation rate; it then determines whether the current battery performance degradation rate is within the normal range; if so, the preset pulse power is used as the target pulse power; otherwise, the preset pulse power needs to be adjusted and the determination repeated until the target pulse power is obtained. This method can evaluate the pulse capability of the battery throughout its entire life cycle and verify the impact of the pulse power on the battery's lifespan throughout its entire life cycle, ensuring that the obtained pulse power does not affect the normal use of the battery.

[0116] This application employs a fitted temperature-normal degradation rate curve to obtain the normal degradation rate, using the normal battery performance degradation rate at the average temperature as the evaluation criterion. If the current battery performance degradation rate is not greater than the normal battery performance degradation rate at the average temperature, then the current battery performance degradation rate is determined to be within the normal range; if the current battery performance degradation rate is less than the normal battery performance degradation rate at the average temperature, then the current battery performance degradation rate is determined to be outside the normal range. Specifically, battery health is oversampled and tested at different temperatures to calculate the normal degradation rate at different temperatures. Then, a temperature-normal degradation rate curve is fitted. Depending on the number of samplings and the sampling results, a corresponding linear or nonlinear function can be selected for fitting. The normal degradation rate at the average temperature can be calculated from the temperature-normal degradation rate curve; the more samplings, the more accurate the results.

[0117] In this embodiment of the invention, electronic devices or main control devices can be divided into functional modules according to the above method examples. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing unit. The integrated unit can be implemented in hardware or as a software functional module. It should be noted that the module division in this embodiment of the invention is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0118] Figure 3 This is a schematic diagram of a battery pulse power determination device provided in an embodiment of this application.

[0119] like Figure 3 As shown, the device 30 includes:

[0120] Module 301: The current battery performance degradation rate is not greater than the normal degradation rate.

[0121] The second module 302 is used to perform RPT testing on the battery, and to perform a preset number of charge and discharge tests according to the preset pulse time to obtain the average temperature of the battery and the current battery performance degradation rate.

[0122] The third module 303 is used to determine whether the current battery performance degradation rate is within the normal range.

[0123] The fourth module 304 is used to set a preset pulse power as the target pulse power if the current battery performance degradation rate is within the normal range. The battery life cycle is not affected when the battery is running within the preset pulse time and target pulse power.

[0124] The fifth module 305 is used to perform a first power derating on the preset pulse power if the current battery performance degradation rate is not within the normal range, and after derating, return to execute the step of determining that the dynamic voltage of the battery during charging and discharging under the preset pulse power is within the preset cutoff voltage range, until the target pulse power is obtained.

[0125] Furthermore, the first module 301 is specifically used to: acquire the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time; determine whether the dynamic voltage is within a preset cutoff voltage range; if yes, determine that the dynamic voltage is within the preset cutoff voltage range; if no, perform a second power derating on the preset pulse power and then acquire the dynamic voltage again until the dynamic voltage is within the preset cutoff voltage range.

[0126] Furthermore, the first module 301 is specifically used for: when the preset pulse power is the preset pulse charging power and the preset cutoff voltage is the preset charging cutoff voltage, if the dynamic voltage is less than the preset charging cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not less than the preset charging cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

[0127] Furthermore, the first module 301 is specifically used for: when the preset pulse power is the preset pulse discharge power and the preset cutoff voltage is the preset discharge cutoff voltage, if the dynamic voltage is greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

[0128] Furthermore, the first module 301 is specifically used to: obtain a new preset pulse power based on the product of the preset pulse power and the second derating factor; and re-acquire the dynamic voltage based on the new preset pulse power until the dynamic voltage is within the preset cutoff voltage range. The second derating factor is the ratio of the actual battery charging time to the preset pulse time, or the ratio of the actual battery discharging time to the preset pulse time.

[0129] Furthermore, the second module 302 is specifically used to: perform a first RPT test on the battery under the preset SOE of the battery to obtain a first battery health status;

[0130] The battery is subjected to a preset number of charge-discharge tests under a preset SOE condition, and the average temperature and cumulative charge-discharge capacity of the battery are obtained. A second RPT test is performed on the battery under the preset SOE condition to obtain a second battery health status. The current battery performance degradation rate is calculated based on the difference between the first battery health status and the second battery health status and the cumulative charge-discharge capacity.

[0131] Furthermore, the charge / discharge test includes: adjusting the battery to a preset SOE, charging / discharging according to a preset pulse power and preset pulse time; and performing a compensation operation on the battery with the same capacity at the rated power.

[0132] Furthermore, the third module 303 is specifically used to: calculate the corresponding normal degradation rate based on the battery health at different temperatures, fit the temperature-normal degradation rate curve, and calculate the normal degradation rate at the average temperature based on the fitted curve; if the current battery performance degradation rate is not greater than the normal degradation rate, then the current battery performance degradation rate is determined to be within the normal range; if it is not satisfied, then the current battery performance degradation rate is determined to be outside the normal range.

[0133] Furthermore, the fifth module 305 is specifically used to: obtain a new preset pulse power based on the product of the preset pulse power and the first derating factor; wherein, the first derating factor is the ratio of the normal decay rate to the current battery performance decay rate.

[0134] The battery pulse power determination device provided in this embodiment can execute the battery pulse power determination method of the above embodiment. Its implementation principle and technical effect are similar, and will not be described again here.

[0135] In the aforementioned specific implementation of a battery pulse power determination device, each module can be implemented as a processor. The processor can execute computer execution instructions stored in the memory, thereby enabling the processor to execute the aforementioned battery pulse power determination method.

[0136] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4As shown, the electronic device 40 includes at least one processor 401 and a memory 402. The electronic device 40 also includes a communication component 403. The processor 401, memory 402, and communication component 403 are connected via a bus 404.

[0137] In the specific implementation process, at least one processor 401 executes computer execution instructions stored in memory 402, causing at least one processor 401 to execute a battery pulse power determination method as executed on the electronic device side as described above.

[0138] The specific implementation process of processor 401 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0139] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0140] The memory may include high-speed RAM, and may also include non-volatile storage (NVM), such as at least one disk storage.

[0141] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0142] The above description of the functions implemented by electronic devices and main control devices has introduced the solutions provided by the embodiments of the present invention. It is understood that, in order to implement the above functions, the electronic device or main control device includes hardware structures and / or software modules corresponding to the execution of each function. By combining the units and algorithm steps of the various examples described in the embodiments of the present invention, the embodiments of the present invention can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the technical solutions of the embodiments of the present invention.

[0143] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the battery pulse power determination method described above.

[0144] The aforementioned computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0145] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in an electronic device or a host device.

[0146] This application also provides a computer program product, comprising: a computer program stored in a readable storage medium, wherein at least one processor of an electronic device can read the computer program from the readable storage medium, and the at least one processor executes the computer program to cause the electronic device to perform the scheme provided in any of the above embodiments.

[0147] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining battery pulse power, characterized in that, include: Obtain the dynamic voltage of the battery during charging and discharging at a preset pulse power within a preset pulse time; Determine whether the dynamic voltage is within the preset cutoff voltage range; If so, then the dynamic voltage is determined to be within the preset cutoff voltage range; If not, after performing a second power derating on the preset pulse power, the dynamic voltage is reacquired until the dynamic voltage is within the preset cutoff voltage range; The battery is subjected to a first RPT test under a preset SOE to obtain a first battery health status. The battery is subjected to a preset number of charge-discharge tests under a preset SOE, and the average temperature and cumulative charge-discharge capacity of the battery are obtained. The battery is subjected to a second RPT test under a preset SOE to obtain a second battery health status. The current battery performance degradation rate is calculated based on the difference between the first battery health and the second battery health and the cumulative charge and discharge capacity. Determine whether the current battery performance degradation rate is within the normal range; If so, the preset pulse power is used as the target pulse power, wherein running within the preset pulse time and the target pulse power does not affect the battery's life cycle; If not, the preset pulse power is first derating, and after the first power derating, the process returns to performing the steps of RPT testing on the battery and performing a preset number of charge-discharge tests according to the preset pulse time, until the target pulse power is obtained.

2. The method according to claim 1, characterized in that, The step of determining whether the dynamic voltage is within the preset cutoff voltage range includes: The preset pulse power is the preset pulse charging power, and the preset cutoff voltage is the preset charging cutoff voltage. If the dynamic voltage is less than the preset charging cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not less than the preset charging cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range. The preset pulse power is the preset pulse discharge power, and the preset cutoff voltage is the preset discharge cutoff voltage. If the dynamic voltage is greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be within the preset cutoff voltage range; if the dynamic voltage is not greater than the preset discharge cutoff voltage, then the dynamic voltage is determined to be outside the preset cutoff voltage range.

3. The method according to claim 2, characterized in that, After the preset pulse power is dated a second time, the dynamic voltage is reacquired until the dynamic voltage is within the preset cutoff voltage range, including: A new preset pulse power is obtained by multiplying the preset pulse power by the second derating factor; Based on the new preset pulse power, the dynamic voltage is reacquired until the dynamic voltage is within the preset cutoff voltage range. The second derating factor is the ratio of the actual charging time of the battery to the preset pulse time, or the ratio of the actual discharging time of the battery to the preset pulse time.

4. The method according to claim 1, characterized in that, The charge-discharge test includes: Adjust the battery to a preset SOE, and charge / discharge it according to the preset pulse power and the preset pulse time; The battery is compensated with the same amount of charge at its rated power.

5. The method according to claim 1, characterized in that, The step of determining whether the current battery performance degradation rate is within the normal range includes: The normal degradation rate is calculated based on the battery health at different temperatures, a temperature-normal degradation rate curve is fitted, and the normal degradation rate at the average temperature is calculated based on the fitted curve. If the current battery performance degradation rate is not greater than the normal degradation rate, then the current battery performance degradation rate is determined to be within the normal range; otherwise, the current battery performance degradation rate is determined to be outside the normal range.

6. The method according to claim 5, characterized in that, The first power derating of the preset pulse power includes: A new preset pulse power is obtained by multiplying the preset pulse power by the first derating factor; wherein the first derating factor is the ratio of the normal degradation rate to the current battery performance degradation rate.

7. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 6.

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