Power battery health state detection method and system, electronic device and vehicle

Abstract

The application relates to a power battery health state detection method and system, electronic equipment and a vehicle. First, a preset mileage capacity attenuation model is established based on the respective depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process. Then, the health state of the power battery is detected according to the charging data of the power battery to be detected and the preset mileage capacity attenuation model, so that the accuracy of the preset mileage capacity attenuation rate is ensured, and the accuracy of the detection result is ensured.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a method, system, electronic device, and vehicle for detecting the health status of a power battery. Background Technology

[0002] Currently, the commonly used method for detecting the health status of power batteries is as follows: First, data is collected. Every N seconds, parameters of the power battery at the same moment are collected, such as voltage, current, temperature, SOC, and SOH. Then, the deviation of each parameter is analyzed according to a pre-established safety model. Finally, the battery thermal runaway point is determined using a pre-established five-dimensional data safety model of the power battery. The five-dimensional data safety model refers to a safety model based on voltage, current, temperature, SOC, and SOH. The number and nature of the thermal runaway points appearing in the battery per unit time are used to determine whether the current power battery has experienced thermal runaway, that is, to detect the health status of the power battery.

[0003] However, the above detection method has the following problems:

[0004] The above-mentioned detection methods only detect the health status of the power battery by measuring parameters such as voltage, current, temperature, SOC, and SOH, rather than analyzing the most fundamental charging process of the power battery. Therefore, the accuracy of the detection results of the power battery health status cannot be guaranteed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a method, system, electronic device and vehicle for detecting the health status of a power battery.

[0006] The technical solution of the power battery health status detection method of the present invention is as follows:

[0007] S1. Apply any charging data of the power battery to be tested to a preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery to be tested. The preset mileage capacity decay model is obtained by the depolarization charging capacity and energy conversion efficiency corresponding to multiple historical charging processes.

[0008] S2. The health status of the power battery to be tested is detected based on the preset mileage capacity decay rate corresponding to the charging data.

[0009] The beneficial effects of the power battery health status detection method of the present invention are as follows:

[0010] Firstly, a preset mileage capacity attenuation model is established based on the respective depolarization charging capacity and energy conversion efficiency corresponding to multiple historical charging processes, and then the state of health of the power battery is detected according to the charging data of the power battery to be detected and the preset mileage capacity attenuation model, so as to ensure the accuracy of the preset mileage capacity attenuation rate and the accuracy of the detection result.

[0011] On the basis of the above scheme, the power battery state of health detection method of the application can be further improved as follows.

[0012] Further, the obtaining process of the depolarization charging capacity corresponding to each historical charging process comprises:

[0013] From the charging data corresponding to the multiple historical charging processes of the power battery of the same type as the power battery to be detected, the charging capacity value Q0 is obtained, which is charged into the power battery of the same type as the power battery to be detected from the preset starting voltage U 预设起始电压值 to the preset final voltage U 预设终止电压值 , wherein U 预设起始电压值 represents the preset starting voltage value of the charging process, and U 预设终止电压值 represents the preset final voltage value of the charging process, and Q0 represents the charging capacity value charged into the power battery of the same type as the power battery to be detected from the preset starting voltage value U 预设终止电压值 to the preset final voltage value U 预设起始电压值 .

[0014] The depolarization charging capacity Q 去极化 corresponding to each historical charging process is obtained according to the first formula, and the first formula is: Q 去极化 = Q0-C 起始极化 -C 终止极化 , Q 去极化 represents the depolarization charging capacity corresponding to the charging process, C 起始极化 represents the polarization capacity caused by the battery internal resistance of the power battery of the same type as the power battery to be detected under direct current charging when charging to U 预设起始电压值 , and C 终止极化 represents the polarization capacity caused by the battery internal resistance of the power battery of the same type as the power battery to be detected under direct current charging when charging to U 预设终止电压值 , wherein C 起始极化 =C 预设起始电压值 -C 去起始极化 , wherein C 预设起始电压值 represents the preset starting voltage value U 预设起始电压值 , and C 去起始极化 represents the charging capacity corresponding to the standard charging curve data of the power battery of the same type as the power battery to be detected, and U 起始去极化corresponding to the standard charging curve data, U 起始去极化 = U 预设起始电压值 -U 起始极化压差 , U 起始极化压差 = (i 起始 -i 标 ) * R T起始 , U 起始去极化 represents: the starting depolarization charging voltage value, U 起始极化压差 represents: the polarization voltage difference caused by the current i 预设起始电压值 and T 起始 when charging the power battery of the same model as the to-be-detected power battery to U 起始 , i 起始 represents: the current when charging the power battery of the same model as the to-be-detected power battery to U 预设起始电压值 , T 起始 represents: the temperature when charging the power battery of the same model as the to-be-detected power battery to U 预设起始电压值 , i 标 represents: the design standard charging current of the power battery of the same model as the to-be-detected power battery, R T起始 represents: the internal resistance of the power battery of the same model as the to-be-detected power battery at T 起始 temperature, C 终止极化 = C 预设终止电压值 -C 去终止极化 , C 预设终止电压值 represents: the preset termination voltage value U 预设终止电压值 corresponding to the standard charging curve data, C 去终止极化 represents: the termination depolarization charging voltage U 终止去极化 corresponding to the standard charging curve data, U 终止去极化 represents: the termination depolarization charging voltage value, and U 终止去极化 = U 预设终止电压值 -U 终止极化压差 , U 终止极化压差 = (i 终止 -i 标 ) * R T终止 , U 终止极化压差 represents: the polarization voltage difference caused by the current i 预设终止电压值 and T 终止 when charging the power battery of the same model as the to-be-detected power battery to U 终止 , i 终止 represents: the current when charging the power battery of the same model as the to-be-detected power battery to U 预设终止电压值 , T 终止 represents: the temperature when charging the power battery of the same model as the to-be-detected power battery to U 预设终止电压值 , R T终止represents: the internal resistance of the power battery of the same type as the power battery to be detected at T 终止 , and the standard charging curve of the power battery of the same type as the power battery to be detected represents: the charging curve of the power battery of the same type as the power battery to be detected at the design calibration temperature and the calibration charging current i 标 .

[0015] Further, the obtaining process of the energy conversion efficiency corresponding to each historical charging process comprises:

[0016] The obtaining process of the energy conversion efficiency corresponding to each historical charging process comprises:

[0017] According to the second formula, the energy conversion efficiency P i,T corresponding to each historical charging process is obtained. i,T The plurality of energy conversion efficiencies P x are fitted to obtain an energy conversion efficiency model: P x = f(i, T), wherein P i,T represents: the energy conversion efficiency of the power battery to be detected and related to temperature and current, and the second formula is: P s = Q i,T / Q i,T , Q 预设起始电压值 represents: the depolarization charging capacity corresponding to charging a new power battery of the same type as the power battery to be detected at a preset temperature T with a preset direct current i, wherein the voltage is charged from U 预设终止电压值 to U s , wherein the distribution of temperature T and preset direct current i is covered in the design use range of the power battery to be detected, Q 预设起始电压值 represents: the depolarization charging capacity corresponding to charging a new power battery of the same type as the power battery to be detected at a preset temperature T with a preset direct current i, wherein the voltage is charged from U 预设终止电压值 to U 衰减 .

[0018] Further, the obtaining process of the preset mileage capacity decay model comprises:

[0019] According to the depolarization charging capacity and the energy conversion efficiency corresponding to each historical charging process, the preset mileage capacity decay model is obtained as: K 类标 = (Q s - Q odo ) / (S 预设公里数 / L 类标 ), wherein Q 去极化 = Q x × P 衰减 , K 类标This indicates that, under preset temperature T and preset DC current i, the voltage of a power battery of the same model as the power battery under test is changed from U... 预设起始电压值 Charge to U 预设终止电压值 The charging capacity during the charging process, theoretically converted to the charging capacity under standard charging conditions, is S. odo Indicates the driving mileage corresponding to the historical charging process, L 预设公里数 This indicates the preset mileage.

[0020] Furthermore, S1 includes:

[0021] Using any charging data of the power battery under test as the charging data corresponding to one charging process, the depolarization charging capacity Q corresponding to that charging data of the power battery under test is obtained. 去极化 And based on the charging data of the power battery to be tested and the energy conversion efficiency model, the energy conversion efficiency corresponding to the charging data of the power battery to be tested is obtained;

[0022] The depolarization charging capacity Q corresponding to the charging data of the power battery under test is... 去极化 The energy conversion efficiency corresponding to the charging data of the tested power battery is input into the preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery under test.

[0023] Furthermore, S2 includes:

[0024] If the preset mileage capacity decay rate corresponding to any charging data of the power battery under test is greater than the theoretical minimum preset mileage capacity decay rate of the power battery under test, then the power battery under test is determined to be in a healthy state; otherwise, the power battery under test is determined to be in a dangerous state.

[0025] Furthermore, it also includes:

[0026] If the battery under test is determined to be in a dangerous state based on two consecutive charging data points, an early warning will be issued.

[0027] The technical solution of the power battery health status detection system of the present invention is as follows:

[0028] Includes an application computing module and a detection module;

[0029] The application calculation module is used to: apply any charging data of the power battery under test to a preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery under test, wherein the preset mileage capacity decay model is obtained by the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process.

[0030] The detection module is configured to detect the health state of the power battery according to the preset mileage capacity attenuation rate corresponding to the charging data.

[0031] The power battery health state detection system has the following advantages:

[0032] Firstly, a preset mileage capacity attenuation model is established based on the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process, and then the health state of the power battery is detected according to the charging data of the power battery to be detected and the preset mileage capacity attenuation model, so as to ensure the accuracy of the preset mileage capacity attenuation rate and the accuracy of the detection result.

[0033] Based on the above scheme, the power battery health state detection system can be further improved as follows.

[0034] Further, the system further comprises a first calculation module and a second calculation module.

[0035] The first calculation module is configured to obtain a charging capacity value Q0 charged into a power battery of the same type as the power battery to be detected from a plurality of historical charging processes of the power battery, when the power battery is charged from a preset starting voltage U 预设起始电压值 to a preset final voltage U 预设终止电压值 , wherein U 预设起始电压值 represents the preset starting voltage value of the charging process, and U 预设终止电压值 represents the preset final voltage value of the charging process, and Q0 represents the charging capacity value charged into the power battery of the same type as the power battery to be detected when the power battery is charged from the preset starting voltage value U 预设终止电压值 to the preset final voltage value U 预设起始电压值 .

[0036] The second calculation module is configured to obtain the depolarization charging capacity Q 去极化 corresponding to each historical charging process according to a first formula, wherein the first formula is Q 去极化 = Q0-C 起始极化 -C 终止极化 , Q 去极化 represents the depolarization charging capacity corresponding to the charging process, C 起始极化 represents the polarization capacity of the power battery of the same type as the power battery to be detected under direct current charging when the power battery is charged to U 预设起始电压值 , and C 终止极化 represents the polarization capacity of the power battery of the same type as the power battery to be detected under direct current charging when the power battery is charged to U 预设终止电压值 .

[0037] C 起始极化 =C 预设起始电压值 -C 去起始极化 , C 预设起始电压值 represents: preset starting voltage value U 预设起始电压值 corresponding to the standard charging curve data of the power battery of the same model as the power battery to be detected, C 去起始极化 represents: starting depolarization charging voltage U 起始去极化 corresponding to the standard charging curve data, U 起始去极化 = U 预设起始电压值 -U 起始极化压差 , U 起始极化压差 = (i 起始 -i 标 ) * R T起始 , U 起始去极化 represents: starting depolarization charging voltage value, U 起始极化压差 represents: the polarization voltage difference caused by the current i 预设起始电压值 and T 起始 when the power battery of the same model as the power battery to be detected is charged to U 起始 , i 起始 represents: the current when the power battery of the same model as the power battery to be detected is charged to U 预设起始电压值 , T 起始 represents: the temperature when the power battery of the same model as the power battery to be detected is charged to U 预设起始电压值 , i 标 represents: the design standard charging current of the power battery of the same model as the power battery to be detected, R T起始 represents: the internal resistance of the power battery of the same model as the power battery to be detected at T 起始 temperature;

[0038] C 终止极化 =C 预设终止电压值 -C 去终止极化 , C 预设终止电压值 represents: preset ending voltage value U 预设终止电压值 corresponding to the standard charging curve data, C 去终止极化 represents: ending depolarization charging voltage U 终止去极化 corresponding to the standard charging curve data, U 终止去极化 represents: ending depolarization charging voltage value, and U 终止去极化 = U 预设终止电压值 -U 终止极化压差 , U 终止极化压差 = (i 终止 -i 标 ) * R T终止 , U 终止极化压差represents: the current when a power battery of the same model as the power battery to be detected is charged to U 预设终止电压值 at T 终止 , the polarization voltage difference caused by i 终止 at T 终止 represents: the current when a power battery of the same model as the power battery to be detected is charged to U 预设终止电压值 at T 终止 represents: the temperature when a power battery of the same model as the power battery to be detected is charged to U 预设终止电压值 at T T终止 represents: the battery internal resistance of a power battery of the same model as the power battery to be detected at T 终止 , the standard charging curve of the power battery of the same model as the power battery to be detected represents: the charging curve of a power battery of the same model as the power battery to be detected under the design calibration temperature and the calibration charging current i 标 .

[0039] Further, the method further comprises a third calculation module, the third calculation module is used for obtaining the energy conversion efficiency P i,T corresponding to each historical charging process according to a second formula, and fitting a plurality of energy conversion efficiencies P i,T to obtain an energy conversion efficiency model: P x = f(i, T), wherein P x represents: the energy conversion efficiency related to the power battery to be detected, the temperature and the current, and the second formula is: P i,T = Q s / Q i,T , Q i,T represents: the depolarization charging capacity corresponding to charging a new power battery of the same model as the power battery to be detected at a temperature T with a preset direct current i, the voltage being charged from U 预设起始电压值 to U 预设终止电压值 , wherein the distribution of the preset temperature T and the preset direct current i covers the design use range of the power battery to be detected, Q s represents: the depolarization charging capacity corresponding to charging a new power battery of the same model as the power battery to be detected at a preset temperature T with a preset direct current i, the battery voltage being charged from U 预设起始电压值 to U 预设终止电压值 .

[0040] Further, the method further comprises a final construction module, the final construction module is used for obtaining the preset mileage capacity attenuation model as: K 衰减 = (Q 类标 -Q s ) / (S odo / L 预设公里数), wherein Q 类标 = Q 去极化 × P x , K 衰减 represents: preset mileage capacity attenuation rate, Q 类标 represents: the charging capacity of the charging process of charging the voltage of the power battery of the same model as the to-be-detected power battery from U 预设起始电压值 to U 预设终止电压值 at a preset temperature T and a preset direct current i is theoretically converted into the charging capacity under the standard charging mode, S odo represents the historical charging process corresponding driving mileage, L 预设公里数 represents the preset mileage.

[0041] Further, the application calculation module is specifically used for:

[0042] taking the charging data of the to-be-detected power battery as the charging data corresponding to a charging process, obtaining the depolarization charging capacity Q 去极化 corresponding to the charging data of the to-be-detected power battery, and obtaining the energy conversion efficiency corresponding to the charging data of the to-be-detected power battery according to the charging data of the to-be-detected power battery and the energy conversion efficiency model;

[0043] the depolarization charging capacity Q 去极化 corresponding to the charging data of the to-be-detected power battery and the energy conversion efficiency corresponding to the charging data of the to-be-detected power battery are brought into the preset mileage capacity attenuation model to obtain the preset mileage capacity attenuation rate corresponding to the charging data of the to-be-detected power battery.

[0044] Further, the detection module is specifically used for: judging whether the preset mileage capacity attenuation rate corresponding to the charging data of the to-be-detected power battery is greater than the theoretical minimum preset mileage capacity attenuation rate of the to-be-detected power battery, if yes, determining that the state of the to-be-detected power battery is healthy, and if no, determining that the state of the to-be-detected power battery is dangerous.

[0045] Further, the application further comprises a warning module, and the warning module is used for:

[0046] when the state of the to-be-detected power battery is determined to be dangerous according to the continuous two charging data of the to-be-detected power battery, a warning is performed.

[0047] A storage medium, the storage medium stores instructions, when the computer reads the instructions, the computer executes any one of the power battery health state detection methods.

[0048] An electronic device of the present application comprises a memory, a processor and a program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the power battery health state detection methods when running the program.

[0049] A vehicle of the present application comprises the electronic device described above. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 Fig. 1 is a flowchart of a power battery health state detection method of an embodiment of the present application;

[0051] Figure 2 Fig. 4 is a graph of the relationship between the battery internal resistance and temperature;

[0052] Figure 3 Fig. 5 is a standard charging curve;

[0053] Figure 4 Fig. 6 is another flowchart of a power battery health state detection method of an embodiment of the present application;

[0054] Figure 5 Fig. 7 is a flowchart of establishing a preset mileage capacity attenuation model;

[0055] Figure 6 Fig. 8 is a structural diagram of a power battery health state detection system of an embodiment of the present application. DETAILED DESCRIPTION

[0056] As shown in Fig. 1, a power battery health state detection method of an embodiment of the present application comprises the following steps: Figure 1

[0057] S1, applying the data of any one charging of a power battery to be detected to a preset mileage capacity attenuation model to obtain a preset mileage capacity attenuation rate corresponding to the charging data of the power battery to be detected, wherein the preset mileage capacity attenuation model is obtained through the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process;

[0058] S2, detecting the health state of the power battery to be detected according to the preset mileage capacity attenuation rate corresponding to the charging data.

[0059] Firstly, a preset mileage capacity attenuation model is established based on the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process, and then the health state of the power battery to be detected is detected according to the charging data of the power battery to be detected and the preset mileage capacity attenuation model, so as to ensure the accuracy of the preset mileage capacity attenuation rate and the accuracy of the detection result.

[0060] ​The preset mileage can be adjusted and set according to actual conditions, and is generally set to 10,000 kilometers, and the preset mileage capacity decay rate is a 10,000-kilometer capacity decay rate.

[0061] The once historical charging corresponds to one depolarization charging capacity and one energy conversion efficiency.

[0062] Preferably, in the above technical solution, the obtaining process of the depolarization charging capacity corresponding to each historical charging process comprises:

[0063] S010, obtaining a charging capacity value, specifically:

[0064] From the charging data corresponding to the multiple historical charging processes of the power battery of the same model as the to-be-detected power battery, a charging capacity value Q0 is obtained, which is charged into the power battery of the same model as the to-be-detected power battery from a preset starting voltage U 预设起始电压值 to a preset final voltage U 预设终止电压值 , wherein U 预设起始电压值 represents the preset starting voltage value of the charging process, U 预设终止电压值 represents the preset final voltage value of the charging process, and Q0 represents the charging capacity value charged into the power battery of the same model as the to-be-detected power battery from the preset starting voltage value U 预设终止电压值 to the preset final voltage value U 预设起始电压值 ;

[0065] The power battery of the same model refers to the power battery pack of the same product, i.e., the power battery pack of the same product.

[0066] S011, obtaining a depolarization charging capacity, specifically:

[0067] According to the first formula, the depolarization charging capacity Q 去极化 corresponding to each historical charging process is obtained, and the first formula is Q 去极化 = Q0-C 起始极化 -C 终止极化 , Q 去极化 represents the depolarization charging capacity corresponding to the charging process, C 起始极化 represents the polarization capacity caused by the battery internal resistance of the power battery of the same model as the to-be-detected power battery under direct current charging when charging to U 预设起始电压值 , C 终止极化 represents the polarization capacity caused by the battery internal resistance of the power battery of the same model as the to-be-detected power battery under direct current charging when charging to U 预设终止电压值 , and C 起始极化 =C 预设起始电压值 -C 去起始极化 , wherein C 预设起始电压值represents: preset starting voltage value U 预设起始电压值 represents: charging capacity corresponding to standard charging curve data of power battery of same type as the power battery to be detected, C 去起始极化 represents: starting depolarization charging voltage U 起始去极化 represents: charging capacity corresponding to the standard charging curve data, U 起始去极化 = U 预设起始电压值 -U 起始极化压差 , U 起始极化压差 = (i 起始 -i 标 ) * R T起始 , U 起始去极化 represents: starting depolarization charging voltage value, U 起始极化压差 represents: polarization voltage difference caused by current i 预设起始电压值 and temperature T 起始 when charging the power battery of same type as the power battery to be detected to U 起始 represents: current when charging the power battery of same type as the power battery to be detected to U 起始 represents: temperature when charging the power battery of same type as the power battery to be detected to U 预设起始电压值 represents: design standard charging current of the power battery of same type as the power battery to be detected, R 起始 represents: internal resistance of the power battery of same type as the power battery to be detected at temperature T 预设起始电压值 represents: charging capacity corresponding to the standard charging curve data, C 标 =C T起始 -C 起始 , C 终止极化 represents: preset ending voltage value U 预设终止电压值 represents: charging capacity corresponding to standard charging curve data, C 去终止极化 represents: ending depolarization charging voltage U 预设终止电压值 represents: charging capacity corresponding to the standard charging curve data, U 预设终止电压值 represents: ending depolarization charging voltage value, and U 去终止极化 = U 终止去极化 -U 终止去极化 , U 终止去极化 = (i 预设终止电压值 -i 终止极化压差 ) * R 终止极化压差 , U 终止 represents: polarization voltage difference caused by current i 标 and temperature T T终止 when charging the power battery of same type as the power battery to be detected to U 终止极化压差 represents: current when charging the power battery of same type as the power battery to be detected to U 预设终止电压值 represents: temperature when charging the power battery of same type as the power battery to be detected to U 终止 represents: design standard charging current of the power battery of same type as the power battery to be detected, R 终止 represents: internal resistance of the power battery of same type as the power battery to be detected at temperature T 终止Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设终止电压值 Current at time T 终止 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设终止电压值 The temperature at that time, R T终止 Indicates: A power battery of the same model as the power battery under test is in T 终止 The battery internal resistance at temperature, represented by the standard charging curve of a power battery of the same model as the power battery under test: The power battery of the same model as the power battery under test at the design calibration temperature and design standard charging current i 标 Charging curves under certain conditions.

[0068] in, Figure 2 The curve showing the relationship between battery internal resistance and temperature reflects the relationship between battery internal resistance and temperature, which can be obtained based on prior experiments. Figure 2 The graph shown illustrates the relationship between the battery's internal resistance and temperature.

[0069] Preferably, in the above technical solution, the process of obtaining the energy conversion efficiency corresponding to each historical charging process includes:

[0070] The energy conversion efficiency P corresponding to each historical charging process is obtained according to the second formula. i,T And for multiple energy conversion efficiencies P i,T By fitting the data, we obtain the energy conversion efficiency model: P x =f(i,T), where P x Indicates: the energy conversion efficiency of the power battery under test related to temperature and current, and the second formula is: P i,T =Q s / Q i,T Q i,T This indicates that a new power battery of the same model as the power battery under test is charged at temperature T with a preset DC current i, and the voltage starts from U. 预设起始电压值 Charge to U 预设终止电压值 The corresponding depolarization charging capacity, wherein the distribution of the preset temperature T and the preset DC current i covers the design and operating range of the power battery under test, Q s This indicates that a new power battery of the same model as the power battery under test is charged at a preset temperature T and a preset DC current i, and the battery voltage starts from U. 预设起始电压值 Charge to U 预设终止电压值 The corresponding depolarization charging capacity at that time.

[0071] Preferably, in the above technical solution, the process of obtaining the preset mileage capacity attenuation model includes:

[0072] The preset mileage capacity attenuation model is obtained according to the depolarization charging capacity corresponding to each historical charging process and the energy conversion efficiency, and is K 衰减 = (Q 类标 -Q s ) / (S odo / L 预设公里数 ), wherein Q 类标 = Q 去极化 * P x , K 衰减 represents a preset mileage capacity attenuation rate, Q 类标 represents a charging capacity theoretically converted into a charging capacity under a standard charging mode in a charging process of charging a power battery of the same model as the to-be-detected power battery from a voltage U 预设起始电压值 to a voltage U 预设终止电压值 at a preset temperature T and a preset direct current i, S odo represents a historical charging process driving mileage, and L 预设公里数 represents a preset mileage.

[0073] Preferably, in the technical scheme, the S1 comprises:

[0074] S10, taking the charging data of the to-be-detected power battery as charging data corresponding to a charging process, obtaining a depolarization charging capacity Q 去极化 corresponding to the charging data of the to-be-detected power battery, and obtaining an energy conversion efficiency corresponding to the charging data of the to-be-detected power battery according to the charging data of the to-be-detected power battery and the energy conversion efficiency model;

[0075] S11, bringing the depolarization charging capacity Q 去极化 corresponding to the charging data of the to-be-detected power battery and the energy conversion efficiency corresponding to the charging data of the to-be-detected power battery into the preset mileage capacity attenuation model, to obtain a preset mileage capacity attenuation rate corresponding to the charging data of the to-be-detected power battery.

[0076] The S2 comprises:

[0077] S20, judging whether the preset mileage capacity attenuation rate corresponding to the charging data of the to-be-detected power battery is greater than a theoretical minimum preset mileage capacity attenuation rate of the to-be-detected power battery, if yes, determining that the state of the to-be-detected power battery is healthy, and if no, determining that the state of the to-be-detected power battery is dangerous.

[0078] wherein the preset initial voltage and the preset final voltage can be adjusted and set according to actual conditions, and the standard charging curve data and the standard charging current i 标For the manufacturer of the power battery, the standard charging curve data of the power battery to be detected indicates that the standard charging current i 标 When charging, the power battery to be detected is charged to the corresponding charging capacity at each voltage value, such as the charging capacity corresponding to the voltage value of 3.7V, the charging capacity corresponding to the voltage value of 3.9V, etc. The standard charging curve data can be obtained by pre-experiment, and the standard charging curve as shown in FIG. 1 is made, that is, the charging capacity corresponding to the voltage value of 3.7V, the charging capacity corresponding to the voltage value of 3.9V, etc. can be directly obtained from the standard charging curve as shown in FIG. 1. Figure 3 Figure 3

[0079] The theoretical minimum preset mileage capacity decay rate of the power battery to be detected can be understood as the theoretical minimum preset mileage capacity decay rate of the power battery of the same type as the power battery to be detected. The process of obtaining the theoretical minimum preset mileage capacity decay rate includes:

[0080] The warranty agreement of the power battery of the same type as the power battery to be detected is obtained, for example, from the warranty agreement of the type, it is stipulated that the power battery of the type is guaranteed A ten thousand kilometers, and the capacity decay value is not more than B ampere-hours within the warranty period, then the theoretical minimum ten-thousand-kilometer capacity decay rate K s of the power battery of the type is calculated by the formula K s = (-B / A), and the theoretical minimum preset mileage capacity decay rate at different preset mileages can be calculated accordingly. Then:

[0081] 1) When the preset mileage capacity decay rate corresponding to any charging data of the power battery to be detected is greater than the theoretical minimum preset mileage capacity decay rate of the power battery of the same type as the power battery to be detected, that is, K 衰减 > K s , because K 衰减 and K s are negative values, it is determined that the state of the power battery to be detected is healthy. It can be understood that |K 衰减 | < |K s |, that is, the absolute value of K 衰减 is less than the absolute value of K s , and is recorded, such as in the battery management system BMS or in the database;

[0082] 2) When the preset mileage capacity decay rate corresponding to any charging data of the power battery to be detected is less than the theoretical minimum preset mileage capacity decay rate of the power battery of the same type as the power battery to be detected, that is, K 衰减 < K s , because K 衰减 and K s ​​are all negative values, it is determined that the state of the to-be-detected power battery is dangerous, and it can be understood that: at this time, the absolute value of K 衰减 |K s | is greater than the absolute value of K 衰减 . s

[0083] Preferably, in the above technical solution, further comprising:

[0084] S21, when it is determined according to the continuous two charging data of the to-be-detected power battery that the state of the to-be-detected power battery is dangerous, a warning is performed. Taking the detection of the health state of the to-be-detected power battery as an example, the preset health warning strategy S21 is described in detail, specifically:

[0085] 1) For example, the detection result of this time is healthy, the detection result of the last time is queried from the BMS or the database, if the detection result of the last time is healthy, no warning is performed, and this time of “no warning” is recorded in the BMS or the database; if the detection result of the last time is dangerous, no warning is performed, and this time of “no warning” is recorded in the BMS or the database; and is synchronously sent to the vehicle enterprise and the manufacturer of the to-be-detected power battery, etc.

[0086] 2) For example, the detection result of this time is dangerous, the detection result of the last time is queried from the BMS or the database, if the detection result of the last time is healthy, no warning is performed, and this time of “no warning” is recorded in the BMS or the database; if the detection result of the last time is dangerous, a warning is performed, and this time of “warning” is recorded in the BMS or the database; and is sent to the vehicle enterprise and the manufacturer of the to-be-detected power battery, etc., and informs the user to repair or reminds the user that the power battery of the vehicle will temporarily close the charging function after three days, etc.

[0087] Among them, the warning can also be classified, specifically:

[0088] 1) For example, when the first warning occurs, the warning level is set to level one warning, when the second warning occurs, the warning level is set to level two warning, when the third warning occurs, the warning level is set to level three warning, and when the level two warning or the level three warning occurs, the vehicle enterprise and the manufacturer of the to-be-detected power battery are reminded to pay special attention to the power battery of this type to ensure quality.

[0089] ​2) For example, when the first early warning occurs, the early warning level is set to level one early warning, when the second early warning does not occur continuously, the level one early warning is released, when the second early warning occurs continuously, it is upgraded to level two early warning, when the level two early warning occurs, the vehicle enterprise and the manufacturer of the to-be-tested power battery are reminded to pay special attention to the power battery of this type, to ensure the quality, and the user is informed to repair, or the user is reminded that the power battery of the vehicle will temporarily close the charging function after three days, etc.

[0090] As Figure 4 shown, the method of the present application is described in more detail below by another embodiment, including S40-S43, specifically:

[0091] S40, a preset mileage capacity attenuation model is established, including S401-S405, as shown in Figure 5 :

[0092] S400, a plurality of charging processes are obtained, specifically:

[0093] The BMS background data of the power battery of the same type in the whole life cycle is collected, and the ODO mileage data is obtained from the BMS background data, that is, the different times of charging processes in the life cycle of the vehicle can be distinguished according to the change of the ODO mileage data S odo , which can be understood as: the process of charging the power battery from 0 to 100%, that is, the process of charging the power battery from zero power to full power, the ODO mileage data is unchanged, which is regarded as one charging process, and thus a plurality of historical charging processes are obtained;

[0094] S401, a plurality of historical stable charging processes are selected, specifically:

[0095] The selection standard is set, for example, the selection standard is that the voltage change range of the power battery is 3.65V~4.15V, and the charging current is greater than 0.01C, when the voltage of the power battery is charged to 3.7V, the temperature is greater than or equal to 5℃, and the historical charging process meeting the above selection standard is determined as the historical stable charging process, which can be understood that the selection standard can be set and adjusted according to the actual situation;

[0096] S402, the charging capacity value corresponding to each historical stable charging process is obtained, specifically:

[0097] The charging data of each stable charging process is obtained by integrating the charging current and charging time at different voltages from the beginning of charging to the end of charging, to obtain the capacity value of the power battery charged at different voltages in the charging process; the capacity value of the power battery charged at the preset final voltage is subtracted from the capacity value of the power battery charged at the preset starting voltage to obtain the charging capacity value Q0 corresponding to each historical stable charging process respectively; it can be understood that the charging data of each stable charging process includes: the charging current and charging time at different voltages from the beginning of charging to the end of charging, and the temperature, for example: charging the voltage of the power battery from 3.65V to 4.15V at a charging current of 0.01C, and recording data such as temperature, charging current, time, etc. every 0.05V, wherein the charging current of 0.01C represents that 1% of the capacity of the power battery is charged per unit time, and taking the preset starting voltage of 3.7V and the preset final voltage of 4.15V as an example for further description.

[0098] S403, obtain the depolarization charging capacity corresponding to each historical stable charging process, specifically:

[0099] According to the first formula, the depolarization charging capacity Q corresponding to each historical charging process is obtained 去极化 , the first formula is: Q 去极化 =Q0-C 起始极化 -C 终止极化 , Q 去极化 represents the depolarization charging capacity corresponding to the charging process, C 起始极化 represents the polarization capacity caused by the battery internal resistance of the power battery of the same model as the to-be-detected power battery under direct current charging when charging to U 预设起始电压值 , C 终止极化 represents: the polarization capacity caused by the battery internal resistance of the power battery of the same model as the to-be-detected power battery under direct current charging when charging to U 预设终止电压值 , C 起始极化 =C 预设起始电压值 -C 去起始极化 , wherein C 预设起始电压值 represents: the charging capacity corresponding to the preset starting voltage value U 预设起始电压值 on the standard charging curve data of the power battery of the same model as the to-be-detected power battery, C 去起始极化 represents: the charging capacity corresponding to the starting depolarization charging voltage U 起始去极化 on the standard charging curve data, U 起始去极化 =U 预设起始电压值 -U 起始极化压差 , U 起始极化压差 =(i 起始 -i 标 )*R T起始 , U起始去极化 denotes: the initial depolarization charging voltage value, U 起始极化压差 denotes: the charging current of the power battery of the same model as the power battery to be detected when the power battery is charged to U 预设起始电压值 denotes: the temperature at the time when the power battery of the same model as the power battery to be detected is charged to U 起始 denotes: the polarization voltage difference caused by the current i 起始 denotes: the charging current of the power battery of the same model as the power battery to be detected when the power battery is charged to U 起始 denotes: the temperature at the time when the power battery of the same model as the power battery to be detected is charged to U 预设起始电压值 denotes: the charging current of the power battery of the same model as the power battery to be detected when the power battery is charged to U 起始 denotes: the temperature at the time when the power battery of the same model as the power battery to be detected is charged to U 预设起始电压值 denotes: the design standard charging current of the power battery of the same model as the power battery to be detected, R 标 denotes: the battery internal resistance of the power battery of the same model as the power battery to be detected at T T起始 denotes: the battery internal resistance of the power battery of the same model as the power battery to be detected at T 起始 denotes: C 终止极化 =C 预设终止电压值 -C 去终止极化 , C 预设终止电压值 denotes: the preset termination voltage value U 预设终止电压值 denotes: the corresponding charging capacity on the standard charging curve data, C 去终止极化 denotes: the termination depolarization charging voltage U 终止去极化 denotes: the corresponding charging capacity on the standard charging curve data, U 终止去极化 denotes: the termination depolarization charging voltage value, and U 终止去极化 =U 预设终止电压值 -U 终止极化压差 , U 终止极化压差 =(i 终止 -i 标 )*R T终止 , U 终止极化压差 denotes: the charging current of the power battery of the same model as the power battery to be detected when the power battery is charged to U 预设终止电压值 denotes: the temperature at the time when the power battery of the same model as the power battery to be detected is charged to U 终止 denotes: the polarization voltage difference caused by the current i 终止 denotes: the charging current of the power battery of the same model as the power battery to be detected when the power battery is charged to U 终止 denotes: the temperature at the time when the power battery of the same model as the power battery to be detected is charged to U 预设终止电压值 denotes: the charging current of the power battery of the same model as the power battery to be detected when the power battery is charged to U 终止 denotes: the temperature at the time when the power battery of the same model as the power battery to be detected is charged to U 预设终止电压值 denotes: the design standard charging current of the power battery of the same model as the power battery to be detected, R T终止 denotes: the battery internal resistance of the power battery of the same model as the power battery to be detected at T 终止 denotes: the standard charging curve of the power battery of the same model as the power battery to be detected under the design calibration temperature and the design standard charging current i 标 denotes: the charging curve of the power battery of the same model as the power battery to be detected under the design calibration temperature and the design standard charging current i

[0100] S404. Obtain the energy conversion efficiency P corresponding to each historical stable charging process. i,T , specifically:

[0101] The energy conversion efficiency P corresponding to each historical charging process is obtained according to the second formula. i,T And for multiple energy conversion efficiencies P i,T By fitting the data, we obtain the energy conversion efficiency model: P x =f(i,T), where P x Indicates: the energy conversion efficiency of the power battery under test related to temperature and current, and the second formula is: P i,T =Q s / Q i,T Q i,T This indicates that a new power battery of the same model as the power battery under test is charged at temperature T with a preset DC current i, and the voltage starts from U. 预设起始电压值 Charge to U 预设终止电压值 The corresponding depolarization charging capacity, wherein the distribution of the preset temperature T and the preset DC current i covers the design and operating range of the power battery under test, Q s This indicates that a new power battery of the same model as the power battery under test is charged at a preset temperature T and a preset DC current i, and the battery voltage starts from U. 预设起始电压值 Charge to U 预设终止电压值 The corresponding depolarization charging capacity at that time.

[0102] Among them, newly produced power batteries can be identified as new power batteries, or power batteries with an ODO mileage of no more than 1,000 kilometers or 2,000 kilometers obtained from the background data can be identified as new power batteries.

[0103] S405. Obtain the preset mileage capacity attenuation model, specifically:

[0104] Based on the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process, the preset range capacity decay model is obtained as follows: K 衰减 = (Q) 类标 -Q s ) / (S odo / L 预设公里数 ), where Q 类标 =Q 去极化 ×P x K 衰减 Indicates: Preset mileage capacity decay rate, Q 类标 This indicates that, under preset temperature T and preset DC current i, the voltage of a power battery of the same model as the power battery under test is changed from U... 预设起始电压值 Charge to U 预设终止电压值the charging capacity of the charging process is theoretically converted into the charging capacity under the standard charging mode, S odo represents the historical charging process corresponding to the driving mileage, L 预设公里数 represents the preset mileage, wherein, when L 预设公里数 =10000km, then K 衰减 represents the capacity attenuation rate per 10000km;

[0105] It can be understood that: based on the respective depolarization charging capacity and energy conversion efficiency corresponding to each historical stable charging process, the preset mileage capacity attenuation model is established, which excludes the interference of abnormal data, i.e. the charging data respectively corresponding to the non-historical stable charging process, further ensuring the accuracy of the detection result.

[0106] S41, health detection of the to-be-detected power battery, including S410-S412, specifically:

[0107] S410, taking the charging data of the to-be-detected power battery as the charging data corresponding to a stable charging process, executing S401-S403 to obtain the depolarization charging capacity Q 去极化 corresponding to the charging data of the to-be-detected power battery, and obtaining the energy conversion efficiency corresponding to the charging data of the to-be-detected power battery according to the charging data of the to-be-detected power battery and the energy conversion efficiency model.

[0108] S411, obtaining the preset mileage capacity attenuation rate corresponding to the charging data of the to-be-detected power battery, specifically:

[0109] bringing the depolarization charging capacity Q 去极化 corresponding to the charging data of the to-be-detected power battery and the energy conversion efficiency corresponding to the charging data of the to-be-detected power battery into the preset mileage capacity attenuation model to obtain the preset mileage capacity attenuation rate corresponding to the charging data of the to-be-detected power battery;

[0110] S412, detection, specifically: detecting the health state of the to-be-detected power battery according to the preset mileage capacity attenuation rate corresponding to the charging data, for details, see the description of S20 above.

[0111] S42, early warning, specifically: when the state of the to-be-detected power battery is determined to be dangerous according to the continuous two charging data of the to-be-detected power battery, early warning is performed, and the early warning mode, i.e. the preset health early warning strategy, is described in the foregoing S21.

[0112] Wherein, since the selected example vehicle charging voltage is 4.15V, the designed cutoff current is 0.1C, and the standard charging current i 标 of this model is equal, so according to the calculation formula, U终止极化压差 Equals 0, and then C 终止极化 It equals 0.

[0113] This application discloses a method for detecting the health status of a power battery. It obtains the relationship between the battery's internal resistance and temperature characteristics of a power battery of the same model as the one being tested using cell test data. The relationship between the battery's internal resistance and temperature characteristics can be obtained by testing the cells within the power battery, eliminating the polarization capacity difference caused by the battery's internal resistance during DC charging. Then, using statistical methods, it determines the difference in the impact of temperature and charging current on the charging capacity (i.e., energy conversion efficiency) of a vehicle model with the same model of power battery installed during operation. Finally, it obtains a standard capacity calculation model for that vehicle model, namely a preset mileage capacity decay model. This method aims to ensure the accuracy of subsequent calculations of the vehicle's charging capacity and the preset mileage capacity decay rate obtained from the charging capacity and mileage, thereby maximizing the accuracy of the test results.

[0114] In the above embodiments, although the steps are numbered S1, S2, etc., they are only specific embodiments given in this application. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is also within the protection scope of this invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0115] like Figure 6 As shown, a power battery health status detection system 200 according to an embodiment of the present invention includes an application computing module 210 and a detection module 220.

[0116] The application calculation module 210 is used to: apply any charging data of the power battery to be tested to a preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery to be tested, wherein the preset mileage capacity decay model is obtained by the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process.

[0117] The detection module 220 is used to detect the health status of the power battery to be tested based on the preset mileage capacity decay rate corresponding to the charging data.

[0118] First, a preset mileage capacity decay model is established based on the depolarization charging capacity and energy conversion efficiency corresponding to each historical stable charging process. Then, the health status of the power battery is detected based on any charging data of the power battery under test and the preset mileage capacity decay model to ensure the accuracy of the preset mileage capacity decay rate, thereby ensuring the accuracy of the test results.

[0119] Preferably, the technical scheme further comprises a first calculation module and a second calculation module.

[0120] The first calculation module is configured to obtain a charging capacity value Q0 that is charged into a power battery of the same type as the to-be-detected power battery from a preset starting voltage U 预设起始电压值 to a preset final voltage U 预设终止电压值 , wherein U 预设起始电压值 represents the preset starting voltage value of the charging process, U 预设终止电压值 represents the preset final voltage value of the charging process, and Q0 represents the charging capacity value that is charged into the power battery of the same type as the to-be-detected power battery from the preset starting voltage value U 预设终止电压值 to the preset final voltage value U 预设起始电压值 .

[0121] The second calculation module is configured to obtain a depolarization charging capacity Q 去极化 of each historical charging process according to a first formula, wherein the first formula is Q 去极化 = Q0-C 起始极化 -C 终止极化 , Q 去极化 represents the depolarization charging capacity corresponding to the charging process, C 起始极化 represents a polarization capacity caused by the internal resistance of the power battery of the same type as the to-be-detected power battery under direct current charging when the power battery is charged to U 预设起始电压值 , and C 终止极化 represents the polarization capacity caused by the internal resistance of the power battery of the same type as the to-be-detected power battery under direct current charging when the power battery is charged to U 预设终止电压值 .

[0122] C 起始极化 =C 预设起始电压值 -C 去起始极化 , wherein C 预设起始电压值 represents the charging capacity on the standard charging curve data of the power battery of the same type as the to-be-detected power battery corresponding to the starting depolarization charging voltage U 预设起始电压值 , C 去起始极化 represents the charging capacity on the standard charging curve data corresponding to the starting depolarization charging voltage U 起始去极化 , U 起始去极化 =U 预设起始电压值 -U 起始极化压差 , U 起始极化压差 =(i 起始 -i 标 )*R T起始 , and U 起始去极化 represents the starting depolarization charging voltage value. 起始极化压差represents: the current when charging the power battery of the same model as the power battery to be detected to U 预设起始电压值 represents: the current when charging the power battery of the same model as the power battery to be detected to U 起始 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 起始 represents: the polarization voltage difference caused by the current i 起始 represents: the current when charging the power battery of the same model as the power battery to be detected to U 预设起始电压值 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 起始 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 预设起始电压值 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 标 represents: the design standard charging current of the power battery of the same model as the power battery to be detected T起始 represents: the battery internal resistance of the power battery of the same model as the power battery to be detected at T 起始 temperature

[0123] C 终止极化 =C 预设终止电压值 -C 去终止极化 , C 预设终止电压值 represents: the preset end voltage value U 预设终止电压值 corresponding to the charging capacity on the standard charging curve data 去终止极化 represents: the end depolarization charging voltage U 终止去极化 corresponding to the charging capacity on the standard charging curve data 终止去极化 represents: the end depolarization charging voltage value, and U 终止去极化 =U 预设终止电压值 -U 终止极化压差 , U 终止极化压差 = (i 终止 -i 标 ) * R T终止 , U 终止极化压差 represents: the current when charging the power battery of the same model as the power battery to be detected to U 预设终止电压值 represents: the current when charging the power battery of the same model as the power battery to be detected to U 终止 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 终止 represents: the polarization voltage difference caused by the current i 终止 represents: the current when charging the power battery of the same model as the power battery to be detected to U 预设终止电压值 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 终止 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U 预设终止电压值 represents: the temperature when charging the power battery of the same model as the power battery to be detected to U T终止 represents: the battery internal resistance of the power battery of the same model as the power battery to be detected at T 终止 temperature, and the standard charging curve of the power battery of the same model as the power battery to be detected represents: the charging curve of the power battery of the same model as the power battery to be detected under the design calibration temperature and the calibration charging current i 标 .

[0124] Preferably, in the technical solution, a third calculation module is further included, and the third calculation module is configured to obtain the energy conversion efficiency P i,T of each historical charging process according to a second formula i,T , and fit the plurality of energy conversion efficiencies P x to obtain an energy conversion efficiency model: P x = f(i, T), wherein P i,T represents the energy conversion efficiency of the power battery to be detected and related to temperature and current, the second formula is P s = Q i,T / Q i,T , Q 预设起始电压值 represents the depolarization charging capacity corresponding to charging a new power battery of the same model as the power battery to be detected at a preset temperature T and with a preset direct current i, and the voltage is charged from U 预设终止电压值 to U s , wherein the distribution of the preset temperature T and the preset direct current i covers the design use range of the power battery to be detected, and Q 预设起始电压值 represents the depolarization charging capacity corresponding to charging a new power battery of the same model as the power battery to be detected at a preset temperature T and with a preset direct current i, and the voltage is charged from U 预设终止电压值 to U

[0125] Preferably, in the technical solution, a final construction module is further included, and the final construction module is configured to obtain the preset mileage capacity attenuation model K 衰减 = (Q 类标 -Q s ) / (S odo / L 预设公里数 ) according to the depolarization charging capacity and the energy conversion efficiency of each historical charging process, wherein Q 类标 = Q 去极化 * P x , and K 衰减 represents a preset mileage capacity attenuation rate, Q 类标 represents the charging capacity theoretically converted into the charging capacity in a standard charging mode under the condition of charging the power battery of the same model as the power battery to be detected at a preset temperature T and with a preset direct current i, and the voltage is charged from U 预设起始电压值 to U 预设终止电压值 , S odo represents the driving mileage corresponding to the historical charging process, and L 预设公里数 represents a preset mileage.

[0126] Preferably, in the technical solution, the application calculation module 210 is specifically configured to:

[0127] The first charging data of the to-be-detected power battery is taken as the charging data corresponding to the first charging process, to obtain the depolarization charging capacity Q corresponding to the first charging data of the to-be-detected power battery 去极化 , and the energy conversion efficiency corresponding to the first charging data of the to-be-detected power battery is obtained according to the charging data of the to-be-detected power battery and the energy conversion efficiency model;

[0128] The depolarization charging capacity Q corresponding to the first charging data of the to-be-detected power battery is taken as the depolarization charging capacity Q corresponding to the first charging data of the to-be-detected power battery 去极化 , and the energy conversion efficiency corresponding to the first charging data of the to-be-detected power battery is obtained according to the charging data of the to-be-detected power battery and the energy conversion efficiency model;

[0129] Further, the detection module is specifically configured to: determine whether the preset mileage capacity decay rate corresponding to the first charging data of the to-be-detected power battery is greater than the theoretical minimum preset mileage capacity decay rate of the to-be-detected power battery, if yes, it is determined that the state of the to-be-detected power battery is healthy, and if no, it is determined that the state of the to-be-detected power battery is dangerous.

[0130] Further, the system further comprises a warning module, and the warning module is configured to:

[0131] When it is determined according to the continuous two charging data of the to-be-detected power battery that the state of the to-be-detected power battery is dangerous, a warning is performed.

[0132] The above steps of implementing corresponding functions of each parameter and each unit module in the power battery health state detection system 200 of the present application can refer to the parameters and steps in the embodiments of the power battery health state detection method, which will not be repeated here.

[0133] The storage medium of the embodiment of the present application stores instructions, and when the computer reads the instructions, the computer executes the power battery health state detection method of any one of the above.

[0134] The electronic device of the embodiment of the present application comprises a memory, a processor, and a program stored in the memory and running on the processor, and the processor implements the steps of the power battery health state detection method of any one of the above when executing the program. The electronic device can be a computer, a mobile phone, etc.

[0135] The vehicle of the embodiment of the present application comprises the above electronic device.

[0136] Those skilled in the art know that the present application can be implemented as a system, a method or a computer program product.

[0137] Therefore, the present disclosure can be embodied in the form of hardware only, software only (including firmware, resident software, micro-code, etc.), or a combination of hardware and software that can all generally be referred to herein as a "circuit," "module" or "system." Furthermore, in some embodiments, the present disclosure can also be implemented in the form of a computer program product that is carried in one or more computer-readable media, which computer-readable media include computer-readable program code.

[0138] Any combination of one or more computer-readable medium can be employed. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains, or stores a program that can be used by an instruction execution system, apparatus, or device.

[0139] Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary, and should not be construed as limiting the present disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A method for detecting the health status of a power battery, characterized in that, include: S1. Apply any charging data of the power battery to be tested to a preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery to be tested. The preset mileage capacity decay model is obtained by the depolarization charging capacity and energy conversion efficiency corresponding to multiple historical charging processes. S2. The health status of the power battery to be tested is detected based on the preset mileage capacity decay rate corresponding to the charging data. The process of obtaining the preset mileage capacity decay model includes: Based on the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process, the preset range capacity decay model is obtained as follows: K 衰减 =(Q 类标 -Q s ) / (S odo / L 预设公里数 ), where Q s This indicates that a new power battery of the same model as the power battery under test is charged at a preset temperature T and a preset DC current i, and the battery voltage starts from a preset initial voltage U. 预设起始电压值 Charge to the preset final voltage U 预设终止电压值 The corresponding depolarization charging capacity, Q 类标 =Q 去极化 ×P x Q 去极化 P represents the depolarization charging capacity corresponding to the charging process. x Indicates: the energy conversion efficiency of the power battery under test related to temperature and current, K 衰减 Indicates: Preset mileage capacity decay rate, Q 类标 This indicates that, under temperature T and a preset DC current i, the voltage of a power battery of the same model as the power battery under test is changed from U... 预设起始电压值 Charge to U 预设终止电压值 The charging capacity during the charging process, theoretically converted to the charging capacity under standard charging conditions, is S. odo Indicates the driving mileage corresponding to the historical charging process, L 预设公里数 This indicates the preset mileage.

2. The method for detecting the health status of a power battery according to claim 1, characterized in that, The process of obtaining the depolarization charging capacity corresponding to each historical charging process includes: From the charging data corresponding to multiple historical charging processes of the power battery of the same model as the power battery to be tested, obtain the power battery starting from a preset starting voltage U. 预设起始电压值 Charge to the preset final voltage U 预设终止电压值 The charging capacity value Q0 at that time, where U 预设起始电压值 Indicates: the preset starting voltage value for the charging process, U 预设终止电压值 Indicates: the preset termination voltage value of the charging process; Q0 indicates that during the charging process, a power battery of the same model as the power battery to be tested will be charged from the preset starting voltage value U. 预设终止电压值 When charging reaches the preset termination voltage value, U 预设起始电压值 The charging capacity value at that time; The depolarization charging capacity Q corresponding to each historical charging process is obtained according to the first formula. 去极化 The first formula is: Q 去极化 =Q0-C 起始极化 -C 终止极化 Q 去极化 C represents the depolarization charging capacity corresponding to the charging process. 起始极化 Indicates charging to U during the charging process. 预设起始电压值 At that time, the polarization capacity caused by the internal resistance of a power battery of the same model as the power battery under DC charging, C 终止极化 Indicates: During the charging process, charging to U 预设终止电压值 At that time, the polarization capacity caused by the internal resistance of a power battery of the same model as the power battery under DC charging, C 起始极化 =C 预设起始电压值 -C 去起始极化 , where C 预设起始电压值 Indicates: Preset starting voltage value U 预设起始电压值 The charging capacity corresponding to the standard charging curve data of the same model of power battery as the power battery to be tested, C 去起始极化 Indicates: Initial depolarization charging voltage U 起始去极化 The corresponding charging capacity, U, on the standard charging curve data 起始去极化 =U 预设起始电压值 -U 起始极化压差 U 起始极化压差 =(i 起始 -i 标 )*R T起始 U 起始去极化 Indicates: Initial depolarization charging voltage value, U 起始极化压差 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设起始电压值 Current i 起始 and T 起始 The resulting polarization voltage difference, i 起始 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设起始电压值 Current at time T 起始 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设起始电压值 The temperature at that time, i 标 Indicates: the standard design charging current of a power battery of the same model as the power battery under test, R T起始 Indicates: A power battery of the same model as the power battery under test is in T 起始 Battery internal resistance at temperature, C 终止极化 =C 预设终止电压值 -C 去终止极化 C 预设终止电压值 Indicates: Preset termination voltage value U 预设终止电压值 The corresponding charging capacity, C, on the standard charging curve data. 去终止极化 Indicates: Termination depolarization charging voltage U 终止去极化 The corresponding charging capacity, U, on the standard charging curve data 终止去极化 Indicates: the termination depolarization charging voltage value, and U 终止去极化 =U 预设终止电压值 -U 终止极化压差 U 终止极化压差 =(i 终止 -i 标 )*R T终止 U 终止极化压差 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设终止电压值 When, current i 终止 and T 终止 The resulting polarization voltage difference, i 终止 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设终止电压值 Current at time T 终止 Indicates: Charge a power battery of the same model as the power battery to be tested to U. 预设终止电压值 The temperature at that time, R T终止 Indicates: A power battery of the same model as the power battery under test is in T 终止 The battery internal resistance at temperature, represented by the standard charging curve of a power battery of the same model as the power battery under test: The power battery of the same model as the power battery under test at the design calibration temperature and design standard charging current i 标 Charging curves under certain conditions.

3. The method for detecting the health status of a power battery according to claim 2, characterized in that, The process of obtaining the energy conversion efficiency corresponding to each historical charging process includes: The energy conversion efficiency P corresponding to each historical charging process is obtained according to the second formula. i,T And for multiple energy conversion efficiencies P i,T By fitting the data, we obtain the energy conversion efficiency model: P x =f(i,T), where P x Indicates: the energy conversion efficiency of the power battery under test related to temperature and current, and the second formula is: P i,T =Q s / Q i,T Q i,T This indicates that a new power battery of the same model as the power battery to be tested is charged at a preset temperature T with a preset DC current i, and the voltage starts from U. 预设起始电压值 Charge to U 预设终止电压值 The corresponding depolarization charging capacity, wherein the distribution of temperature T and preset DC current i covers the design and operating range of the power battery under test, Q s This indicates that a new power battery of the same model as the power battery under test is charged at a preset temperature T and a preset DC current i, and the battery voltage starts from U. 预设起始电压值 Charge to U 预设终止电压值 The corresponding depolarization charging capacity at that time.

4. The method for detecting the health status of a power battery according to claim 3, characterized in that, S1 includes: Using any charging data of the power battery under test as the charging data corresponding to one charging process, the depolarization charging capacity Q corresponding to that charging data of the power battery under test is obtained. 去极化 And based on the charging data of the power battery to be tested and the energy conversion efficiency model, the energy conversion efficiency corresponding to the charging data of the power battery to be tested is obtained; The depolarization charging capacity Q corresponding to the charging data of the power battery under test is... 去极化 The energy conversion efficiency corresponding to the charging data of the tested power battery is input into the preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery under test.

5. A method for detecting the health status of a power battery according to any one of claims 1 to 3, characterized in that, S2 includes: If the preset mileage capacity decay rate corresponding to any charging data of the power battery under test is greater than the theoretical minimum preset mileage capacity decay rate of the power battery under test, then the power battery under test is determined to be in a healthy state; otherwise, the power battery under test is determined to be in a dangerous state.

6. The method for detecting the health status of a power battery according to claim 5, characterized in that, Also includes: If the battery under test is determined to be in a dangerous state based on two consecutive charging data points, an early warning will be issued.

7. A power battery health status detection system, characterized in that, Includes an application computing module and a detection module; The application calculation module is used to: apply any charging data of the power battery under test to a preset mileage capacity decay model to obtain the preset mileage capacity decay rate corresponding to the charging data of the power battery under test. The preset mileage capacity decay model is obtained by the depolarization charging capacity and energy conversion efficiency corresponding to multiple historical charging processes. The detection module is used to detect the health status of the power battery to be tested based on the preset mileage capacity decay rate corresponding to the charging data. The process of obtaining the preset mileage capacity decay model includes: Based on the depolarization charging capacity and energy conversion efficiency corresponding to each historical charging process, the preset range capacity decay model is obtained as follows: K 衰减 =(Q 类标 -Q s ) / (S odo / L 预设公里数 ), where Q s This indicates that a new power battery of the same model as the power battery under test is charged at a preset temperature T and a preset DC current i, and the battery voltage starts from a preset initial voltage U. 预设起始电压值 Charge to the preset final voltage U 预设终止电压值 The corresponding depolarization charging capacity, Q 类标 =Q 去极化 ×P x Q 去极化 P represents the depolarization charging capacity corresponding to the charging process. x Indicates: the energy conversion efficiency of the power battery under test related to temperature and current, K 衰减 Indicates: Preset mileage capacity decay rate, Q 类标 This indicates that, under temperature T and a preset DC current i, the voltage of a power battery of the same model as the power battery under test is changed from U... 预设起始电压值 Charge to U 预设终止电压值 The charging capacity during the charging process, theoretically converted to the charging capacity under standard charging conditions, is S. odo Indicates the driving mileage corresponding to the historical charging process, L 预设公里数 This indicates the preset mileage.

8. An electronic device comprising a memory, a processor, and a program stored in the memory and running on the processor, characterized in that, When the processor executes the program, it implements the steps of the power battery health status detection method as described in any one of claims 1 to 6.

9. A vehicle, characterized in that, Includes the electronic device described in claim 8.

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