Charging Performance Testing Method and Instrument, Electronic Device, Medium and Program

Abstract

The present application provides a charging performance testing method, apparatus, electronic device, medium and program, belonging to the field of battery technology. The charging performance testing method includes: in response to a configuration operation for charging test conditions, obtaining the configured preset test information; collecting the temperature value of the battery cell and the sampling value of the target signal; determining one of the multiple current look-up tables according to the temperature value and the sampling value of the target signal, and determining the target current value through one of the current look-up tables; charging the battery cell with the charging current being the target current value, and returning to the step of collecting the temperature value of the battery cell and the sampling value of the target signal, and looping until the charging cut-off condition is reached. This method can adjust the charging current according to the real-time state of the battery cell, so as to improve the accuracy of the charging performance test of the battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a method and instrument for charging performance testing, an electronic device, a medium, and a program. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Rechargeable batteries have the characteristics of storing energy or releasing energy according to needs, so they are widely used in various electrical devices or energy storage systems and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is an important factor related to its development.

[0003] In order to ensure that the fast charging ability of the battery is qualified, the charging performance test of the battery is necessary. How to improve the accuracy of the charging performance test of a single battery cell is a problem worthy of attention. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the background art. For this reason, an object of the present application is to provide a method and instrument for charging performance testing, an electronic device, a medium, and a program, which can adjust the charging current according to the real-time state of a single battery cell and improve the accuracy of the charging performance test of a single battery cell.

[0005] An embodiment of the first aspect of the present application provides a method for testing the charging performance of a single battery cell, including:

[0006] In response to a configuration operation of charging test conditions, obtain the configured preset test information; the preset test information includes a preset current value and a plurality of current query tables corresponding to a plurality of charging steps one by one;

[0007] Collect the temperature value of the single battery cell and the sampling value of the target signal; the target signal is related to the electrical signal of the single battery cell;

[0008] According to the temperature value and the sampling value of the target signal, determine one of the plurality of current query tables included in the preset test information, where one of the current query tables matches the charging step corresponding to the current state of the single battery cell, and determine the target current value through one of the current query tables; determining the target current value through one of the current query tables includes: determining whether the temperature value and the sampling value of the target signal are both within the index range of one of the current query tables, and in response to the judgment result being no, set the preset current value as the target current value, and in response to the judgment result being yes, determine the target current value through one of the current query tables;

[0009] Charge the single battery cell with the charging current being the target current value, and return to the step of collecting the temperature value of the single battery cell and the sampling value of the target signal, and loop until the charging cut-off condition is reached.

[0010] Using the charging performance test method of this embodiment, during the fast charging test, the charging current can be adjusted according to the real-time state of the battery cell, making the charging current change dynamically, so that the change of the charging current during the fast charging test is closer to the actual charging current change of the battery cell during the actual fast charging process. This can improve the accuracy of the charging performance test of the battery cell. The battery cells tested by the charging performance test method of this embodiment are used to form the power supply system of electrical equipment such as energy storage devices and electric vehicles. Since the accuracy of the charging performance test of the battery cell is high, it can have a positive effect on the accuracy of predicting the fast charging ability of the power supply system.

[0011] In some embodiments, the target signal includes the state of charge signal, and the preset test information includes the temperature-SOC matrix table, and the temperature-SOC matrix table includes multiple current query tables. This embodiment enables the charging current to be adjusted according to the real-time state of the SOC, so that a suitable charging current can be set at different SOC stages, which is beneficial to reducing the risk of overcharging.

[0012] In some embodiments, the target signal includes the power signal, and the preset test information includes the power-temperature matrix table, and the power-temperature matrix table includes multiple current query tables. This embodiment enables the charging current to be adjusted according to the real-time state of the power, which is beneficial to maximizing the power utilization rate during the fast charging test and improving the fast charging test efficiency.

[0013] In some embodiments, the target signal includes the state of charge signal and the power signal, and the preset test information includes the temperature-SOC matrix table and the power-temperature matrix table;

[0014] According to the temperature value and the sampled value of the target signal, one of the multiple current query tables included in the preset test information is determined, and one of the current query tables matches the charging step of the current state of the battery cell. Determining the target current value through one of the current query tables includes:

[0015] According to the temperature value and the sampled value of the state of charge signal, a first target current query table is determined from the multiple current query tables. The multiple current query tables belong to the temperature-SOC matrix table, and the first target current query table matches the charging step of the current state of the battery cell. The first current value is determined through the first target current query table;

[0016] According to the temperature value and the sampled value of the power signal, a second target current query table is determined from the multiple current query tables. The multiple current query tables belong to the power-temperature matrix table, and the second target current query table matches the charging step of the current state of the battery cell. The second current value is determined through the second target current query table;

[0017] The smaller one of the first current value and the second current value is determined as the target current value.

[0018] This embodiment enables the charging current not to exceed the safe charging range during the charging performance test. In this way, both the accuracy of the charging performance test can be improved, and the safety of the charging performance test can also be enhanced.

[0019] In some embodiments, the target signal is a voltage signal, and the preset test information includes a voltage-temperature table, and the voltage-temperature table includes a plurality of current lookup tables;

[0020] Determining one of the plurality of current lookup tables included in the preset test information according to the temperature value and the sampled value of the target signal, and one of the current lookup tables matches the charging step of the current state of the battery cell, and determining the target current value through one of the current lookup tables includes:

[0021] Determining a third target current lookup table from the plurality of current lookup tables according to the temperature value and the sampled value of the voltage signal, the plurality of current lookup tables belong to the voltage-temperature table, the third target current lookup table matches the charging step of the current state of the battery cell, and determining the target current value through the third target current lookup table.

[0022] This embodiment enables the charging current to be adjusted according to the real-time state of the voltage during the charging performance test.

[0023] In some embodiments, the sampled value of the voltage signal includes the current voltage value and at least one historical voltage value;

[0024] Determining a third target current lookup table from the plurality of current lookup tables according to the temperature value and the sampled value of the voltage signal includes:

[0025] Comparing the maximum historical voltage value among the current voltage value and at least one historical voltage value;

[0026] In response to the comparison result that the current voltage value is less than the maximum historical voltage value, determining a third target current lookup table from the plurality of current lookup tables according to the temperature value and the maximum historical voltage value;

[0027] In response to the comparison result that the current voltage value is greater than or equal to the maximum historical voltage value, determining a third target current lookup table from the plurality of current lookup tables according to the temperature value and the current voltage value.

[0028] This embodiment looks up the table by using the maximum voltage among the current voltage value and all historical voltage values as the input of the sampled value of the voltage signal, so that the possibility of the target current value found mutating between small and large values is low, which is beneficial to reducing the voltage fluctuation degree during the charging performance test.

[0029] In some embodiments, the preset test information further includes a preset look-up table method, and the preset look-up table method is any one of the following methods: an interpolation look-up table method and an interval look-up table method;

[0030] Determining the target current value through one of the current look-up tables includes:

[0031] For temperature values and / or sampled values of the target signal not included in one of the current look-up tables, determining the target current value through the preset look-up table method.

[0032] In this way, by combining look-up tables and simple calculations, the target current value can be obtained, with a small amount of calculation, which is conducive to improving the test efficiency of the charging performance test.

[0033] In some embodiments, the preset test information further includes at least one interpolation look-up table corresponding to each of the multiple current look-up tables; determining the target current value through one of the current look-up tables includes:

[0034] For temperature values and / or sampled values of the target signal not included in one of the current look-up tables, obtaining the target current value from the interpolation look-up table corresponding to one of the current look-up tables.

[0035] In this embodiment, when at least one of the collected temperature value and the sampled value of the target signal is not included in one of the current look-up tables, only the interpolation look-up table needs to be relied on for searching and matching, further reducing the amount of calculation, further improving the running efficiency of the charging performance test method, and also reducing the tiny errors brought by the calculation.

[0036] In some embodiments, collecting the temperature value of the battery cell includes: collecting the temperature values of multiple sampling points on the battery cell;

[0037] According to the temperature value and the sampled value of the target signal, including: according to the temperature values of multiple sampling points and the sampled value of the target signal.

[0038] In some embodiments, the step of determining the target current value through one of the current look-up tables is repeatedly executed every first preset time period; the first preset time period is T1, and 800 ms ≤ T1 ≤ 2 s.

[0039] This embodiment makes the dynamic change frequency of the charging current during the charging performance test moderate, and can balance the response rate to the charging state of the battery cell and the risk of battery polarization.

[0040] In some embodiments, the step of collecting the temperature value is repeatedly executed every second preset time period; the step of collecting the sampled value of the target signal is repeatedly executed every third preset time period; the second preset time period is T2, the third preset time period is T3, T1 > T2, and T1 > T3.

[0041] This embodiment enables high-frequency monitoring of the temperature value of the battery cell and the sampling value of the target signal, which is conducive to improving the real-time performance of temperature and target signal monitoring.

[0042] An embodiment of the second aspect of the present application provides a charging performance test instrument, which includes: a host computer, a middle computer, and a lower computer. The middle computer is communicatively connected to both the host computer and the lower computer, and the lower computer is used to connect to the battery cell;

[0043] The host computer is configured to, in response to a configuration operation of the charging test conditions, obtain the configured preset test information, and send the preset test information to the middle computer; the preset test information includes a preset current value and a plurality of current query tables corresponding to a plurality of charging steps one by one;

[0044] The lower computer is configured to collect the temperature value of the battery cell and the sampling value of the target signal, and send the temperature value and the sampling value of the target signal to the middle computer; the target signal is related to the electrical signal of the battery cell;

[0045] The middle computer is configured to receive the preset test information sent by the host computer, receive the temperature value and the sampling value sent by the lower computer, determine one of the current query tables that matches the charging step of the current state of the battery cell from the plurality of current query tables according to the temperature value and the sampling value of the target signal, determine the target current value through one of the current query tables, and send the target current value to the lower computer; determining the target current value through one of the current query tables includes: determining whether both the temperature value and the sampling value of the target signal are within the index range of one of the current query tables, and in response to the judgment result being no, setting the preset current value as the target current value, and in response to the judgment result being yes, determining the target current value through one of the current query tables;

[0046] The lower computer is configured to receive the target current value sent by the middle computer, charge the battery cell and make the charging current the target current value, and return to the step of the lower computer collecting the temperature value of the battery cell and the sampling value of the target signal, and loop until the charging cut-off condition is reached.

[0047] An embodiment of the third aspect of the present application provides an electronic device for charging performance testing, including: at least one processor; and at least one memory communicatively connected to the at least one processor. The at least one memory stores instructions that, when executed alone or jointly by the at least one processor, cause the electronic device to execute the charging performance testing method in the above embodiments.

[0048] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium storing instructions that, when executed alone or jointly by one or more processors of an electronic device, cause the electronic device to execute the charging performance testing method in the above embodiments.

[0049] An embodiment of the fifth aspect of the present application provides a computer program product, including instructions that, when executed alone or jointly by one or more processors of an electronic device, cause the electronic device to execute the charging performance test method in the above embodiments.

[0050] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. Description of the Drawings

[0051] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with the present application and should not be regarded as limiting the scope of the present application.

[0052] Figure 1 Schematic diagram of the structure of the charging performance test instrument provided for some embodiments of the present application;

[0053] Figure 2 Schematic diagram of the flow of the charging performance test method provided for some embodiments of the present application;

[0054] Figure 3 Schematic diagram of the temperature-SOC matrix table in some embodiments of the present application;

[0055] Figure 4 Schematic diagram of the voltage-temperature table in some embodiments of the present application;

[0056] Figure 5 Schematic diagram of the comparison between the charging curve in some embodiments of the present application and the charging curve of constant current charging;

[0057] Figure 6 Schematic diagram of the electronic device provided for some embodiments of the present application. Detailed Embodiments

[0058] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly and therefore are only examples and should not be used to limit the protection scope of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0061] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0063] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0064] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components.

[0066] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximately parallelism commonly recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity commonly recognized in engineering. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0067] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0068] After the battery is assembled, through processes such as liquid injection, sealing, and standing, it is then tested. Among them, the charging performance test is an indispensable link. Through the charging performance test, to verify whether the charging efficiency, safety, etc. of the battery during fast charging are qualified. At present, in the field of battery technology, a charge-discharge tester in a battery test laboratory is often used to test the fast charging performance of a battery pack, and there are few tests specifically for the fast charging performance of a single battery cell.

[0069] When the charge-discharge tester used to test the fast charging performance of a battery pack is extended to the charging performance test of a single battery cell, since a single battery cell is the smallest unit of a battery pack and it does not have a battery management system (Battery Management System, BMS), during the test process, there is no battery management system to monitor the state of the single battery cell, and thus it is impossible to adjust the charging current according to the real-time state of the single battery cell. During the test process, the charging method for the single battery cell is constant current charging / constant voltage charging / constant power charging, that is, the charging parameters (i.e., charging voltage, charging current, or power) are fixed and unchanged. This will lead to large errors in the test data and affect the test results of the charging performance. Experiments have shown that the error between the maximum charging current measured by this method and the actual maximum charging current is as high as over 42%. This is because in the constant current charging / constant voltage charging / constant power charging mode, the state of the battery may change (for example, the internal resistance increases, the temperature rises, aging, etc.), resulting in the charging current being prone to be too large or too small, affecting the charging efficiency.

[0070] In response to this, a charging performance test method, instrument, electronic device, medium, and program are designed. The method and instrument can collect the temperature value of a single battery cell and the sampling value of a target signal, and can obtain the target value of the current from a current look-up table according to the temperature value and the sampling value of the target signal, and then adjust the charging current to the target value. Using this method, during the fast charging test process, the charging current can be dynamically adjusted according to the change of the real-time state of the single battery cell, which can improve the accuracy of the charging performance test of the single battery cell.

[0071] The test object of the charging performance test method provided by the embodiments of the present application is a single battery cell. The single battery cell involved in the embodiments of the present application can be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0072] The charging performance test method provided by the embodiments of the present application is applied to a charging performance test instrument. Figure 1 As shown in Figure 1 for the structural schematic diagram of the charging performance test instrument provided by some embodiments of the present application, the charging performance test instrument includes: a host computer 510, a middle computer 520, and a lower computer 530.

[0073] Figure 2 As shown in Figure 2 for the flowchart of the charging performance test method provided by some embodiments of the present application. The embodiments of the present application provide a charging performance test method for a single battery cell to test the fast charging performance of the single battery cell. Please refer to

[0074] S110, in response to a configuration operation for charging test conditions, obtain the configured preset test information; the preset test information includes a preset current value and a plurality of current look-up tables corresponding to a plurality of charging steps one by one.

[0075] S120, collect the temperature value of the single battery cell and the sampling value of the target signal; the target signal is related to the electrical signal of the single battery cell.

[0076] S130. Determine one of the multiple current lookup tables included in the preset test information based on the temperature value and the sampled value of the target signal. One of the current lookup tables matches the charging step corresponding to the current state of the battery cell, and determine the target current value through one of the current lookup tables. Among them, "determine the target current value through one of the current lookup tables" may specifically include: determining whether both the temperature value and the sampled value of the target signal are within the index range of one of the current lookup tables; in response to the judgment result being no, set the preset current value as the target current value; in response to the judgment result being yes, determine the target current value through one of the current lookup tables.

[0077] S140. Charge the battery cell with the charging current being the target current value, and return to the step of collecting the temperature value of the battery cell and the sampled value of the target signal, and loop until the charging cut-off condition is reached. That is, return to S120 to continue S120 to S140 until the charging cut-off condition is reached. In other words, when the charging cut-off condition is reached, it indicates that the battery cell is fully charged, and the charging performance test ends.

[0078] During implementation, the tester can, on the host computer 510, through the configuration operation of the charging test conditions, enable the host computer 510 to receive the configured preset test information, and transmit the preset test information to the middle computer 520 so that the middle computer 520 imports the current lookup table. That is to say, the tester can pre-configure the preset current value and import the current lookup table on the host computer 510.

[0079] The charging process includes multiple charging steps. In this article, "charging step" can be understood as an operation / action of the charging performance test instrument during the charging process, and different charging steps correspond to different charging parameters and conditions. For example, during the charging process, first make the charging current be 40A and keep it for 10s, and then make the charging current be 10A and keep it for 20s. Then, in this process, the charging current being 40A and keeping it for 10s is a charging step, and the charging current being 10A and keeping it for 20s is also a charging step.

[0080] The current lookup table is pre-determined by recording the experimental data during the charging test process. The current lookup table is a mapping relationship table between the temperature of the battery cell and the target signal. The current lookup table is a two-dimensional matrix table, and one of the horizontal header and the vertical header of the current lookup table is the value of the temperature, and the other is the value of the target signal.

[0081] The preset current value is a threshold value representing normal charging current, and it can be reasonably designed according to experience and actual needs. For example, the value range of the preset current value can be [500A, 650A], and specifically, any value among 500A, 550A, 600A, and 650A can be selected. Or, the preset current value can also be the maximum value of the current in the current lookup table.

[0082] In S120, the lower computer 530 collects the temperature value of the battery cell and the sampling value of the target signal, and transmits them to the middle computer 520. The electrical signals of the battery cell refer to current and voltage.

[0083] In S130, the middle computer 520 receives the preset test information sent by the upper computer 510, as well as the temperature value and the sampling value of the target signal transmitted by the lower computer 530. According to the current state of the battery cell (i.e., the temperature value and the sampling value of the target signal), it determines the corresponding charging step, and then determines one of the current query tables corresponding to this charging step from multiple current query tables. After that, it looks up the table to determine the target current value and transmits it to the lower computer 530. The specific implementation process for the middle computer 520 to determine whether the temperature value and the sampling value of the target signal are both within the index range of one of the current query tables can be: determining whether the temperature value is greater than or equal to the minimum temperature of the current query table and less than or equal to the maximum temperature of the current query table, and determining whether the sampling value of the target signal is greater than or equal to the minimum value of the target signal in the current query table and less than or equal to the maximum value of the target signal in the current query table. For example, setting the preset current value to 600A, the temperature-SOC matrix table is as Figure 3 , if the collected temperature value is 60°C and the sampling value of SOC is 85%, 60°C is not within [-25°C, 55°C], and 85% is within [0%, 100%], then the judgment result is no, and the target current value is set to 600A.

[0084] In S140, the lower computer 530 adjusts the charging current according to the target current value transmitted by the middle computer 520. Then, S120 to S140 are looped, so that the charging current of the battery cell during the test is dynamically adjusted. The specific process for looking up the table to determine the target current value will be described in detail below.

[0085] When using the charging performance test method of this embodiment to test the fast charging performance of the battery cell, the following process is looped: by collecting the temperature value of the battery cell and the sampling value of the target signal, one of the current query tables that matches the charging step corresponding to the current state of the battery cell can be determined from multiple pre-configured current query tables. Then, by looking up the table, the target current value is determined, and the charging current is adjusted to the target current value. In this way, during the fast charging test process, the charging current can be adjusted according to the real-time state of the battery cell, making the charging current change dynamically, making the change of the charging current during the fast charging test process closer to the actual charging current change of the battery cell during the actual fast charging process. In this way, the accuracy of the fast charging test data can be improved, and further the accuracy of the charging performance test of the battery cell can be enhanced. Moreover, thanks to the fact that the current query table is determined in advance, by looking up the table to determine the target current value, the calculation amount is reduced, and the test efficiency of the charging performance test is improved.

[0086] Moreover, when at least one of the temperature value of the battery cell and the sampling value of the target signal exceeds the index range of the current lookup table in this embodiment, by setting the target current value to a preset current value, the operation stability of this charging performance test method is improved. When using the charging performance test method of this embodiment to test the fast charging performance of a battery cell, if at least one of the temperature value of the battery cell and the sampling value of the target signal collected exceeds the index range of the current lookup table, instead of querying the target current value as the charging current through one of the current lookup tables, charging is performed with the charging current being the preset current value. This can make the charging current more reasonable and reduce the risks brought by unreasonable charging current (for example, thermal runaway during the test due to too high charging current). Moreover, the value of the charging current is a preset safety value, which enables safe charging during the charging performance test.

[0087] The battery cells tested by the charging performance test method of this embodiment are used to form the power supply system of electrical equipment such as energy storage devices and electric vehicles. Since the accuracy of the charging performance test of this battery cell is high, it can have a positive effect on the accuracy of predicting the fast charging ability of the power supply system.

[0088] In the charging performance test method disclosed herein, the target signal related to the electrical signals (i.e., current and voltage signals) of the battery cell can be any one of the following: voltage signal, power signal, state of charge (SOC) signal. Among them, power is equal to the product of current and voltage. The state of charge refers to the percentage of the capacity that the battery cell can release in the actual capacity, and also represents the remaining power of the battery cell. The state of charge is affected by voltage and current; as the voltage of the battery cell increases, the state of charge increases; the greater the charging current of the battery cell, the faster the state of charge rises.

[0089] According to some embodiments of the present application, the target signal can include at least one of the state of charge signal and the power signal.

[0090] In some embodiments, the target signal can include the state of charge signal, and the preset test information can specifically include a temperature - SOC matrix table, and the temperature - SOC matrix table includes a plurality of current lookup tables corresponding to a plurality of charging steps one by one.

[0091] One of the horizontal and vertical headers of the temperature - SOC matrix table is the value of temperature, and the other is the value of SOC. For example, refer to Figure 3 , Figure 3 where the unit of temperature is °C (Celsius) and the unit of SOC is %.

[0092] When using the charging performance test method of this embodiment to test the fast charging performance of a battery cell, during the test process, by collecting the temperature value and SOC of the battery cell, and according to the temperature value and SOC, one of the current lookup tables that matches the charging step of the current state of the battery cell is determined from the temperature-SOC matrix table, and then the target current value is determined by looking up the table. In this way, the charging current can be adjusted according to the real-time state of the SOC, so that appropriate charging currents can be set at different SOC stages, which is beneficial to reducing the risk of overcharging.

[0093] In the technical solution where the target signal includes the state of charge signal, the charging cut-off condition may include at least one of the following conditions: the temperature value of the battery cell reaches a preset temperature; the sampled value of the state of charge signal reaches a preset value. Among them, the value range of the preset temperature can be 50°C to 60°C, and any value among 50°C, 55°C, and 60°C can be specifically selected. The value range of the preset value can be 90% to 100%, and any value among 90%, 95%, and 100% can be specifically selected.

[0094] In some embodiments, the target signal may include a power signal, and the preset test information may specifically include a power-temperature matrix table, and the power-temperature matrix table includes a plurality of current lookup tables corresponding to a plurality of charging steps one by one. Among them, one of the horizontal header and the vertical header of the power-temperature matrix table is the value of temperature, and the other is the value of power.

[0095] When using the charging performance test method of this embodiment to test the fast charging performance of a battery cell, during the test process, by collecting the temperature value of the battery cell and the sampled value of the power, and according to the temperature value and the sampled value of the power, one of the current lookup tables that matches the charging step of the current state of the battery cell is determined from the power-temperature matrix table, and then the target current value is determined by looking up the table. In this way, the charging current can be adjusted according to the real-time state of the power, which is beneficial to maximizing the power utilization rate during the fast charging test process and improving the fast charging test efficiency.

[0096] According to some embodiments of the present application, the target signal may include the state of charge signal and the power signal, and the preset test information includes the temperature-SOC matrix table and the power-temperature matrix table at the same time. That is, in S120, the lower computer 530 collects the temperature value of the battery cell, the sampled value of the state of charge, and the sampled value of the power signal. In this embodiment, the above S130 may specifically include S210 to S230.

[0097] S210, according to the temperature value and the sampled value of the state of charge signal, determine the first target current lookup table from a plurality of current lookup tables. The plurality of current lookup tables belong to the temperature-SOC matrix table, and the first target current lookup table matches the charging step of the current state of the battery cell, and determine the first current value through the first target current lookup table.

[0098] S220. Determine a second target current lookup table from multiple current lookup tables according to the temperature value and the sampled value of the power signal. The multiple current lookup tables belong to a power-temperature matrix table, and the second target current lookup table matches the charging step of the current state of the battery cell. Determine a second current value through the second target current lookup table.

[0099] S230. Determine the smaller one of the first current value and the second current value as the target current value.

[0100] Among them, the execution order of S210 and S220 is not limited. For example, S210 and S220 can be executed simultaneously, or S210 and S220 can also be executed in sequence.

[0101] In S230, when the first current value is lower than the second current value, set the first current value as the target current value. When the first current value is higher than the second current value, set the second current value as the target current value. When the first current value is equal to the second current value, make the target current value equal to the first current value and the second current value.

[0102] When using the charging performance test method of this embodiment to test the fast charging performance of a battery cell, during the test process, find the current value by combining the temperature-SOC matrix table and the power-temperature matrix table, and select one of the found current values as the charging current. Compared with the technical solution of separately querying the power-temperature matrix table according to the temperature value and the power to determine the charging current, and compared with the technical solution of separately querying the temperature-SOC matrix table according to the temperature value and the SOC to determine the charging current, the process of determining the charging current in this embodiment comprehensively considers the state of the battery cell, and thus can determine a more accurate charging current.

[0103] Moreover, compared with the technical solution of determining the larger one of the first current value and the second current value as the target current value, in this embodiment, by making the smaller one of the first current value and the second current value as the target current value, the charging current will not exceed the safe charging range during the charging performance test process. In this way, both the accuracy of the charging performance test can be improved, and the safety of the charging performance test can also be enhanced.

[0104] According to some embodiments of the present application, the target signal can be a voltage signal, and the preset test information can specifically include a voltage-temperature table, and the voltage-temperature table includes multiple current lookup tables corresponding one by one to multiple charging steps. That is, in S120, the lower computer 530 collects the temperature value and the sampled value of the voltage signal of the battery cell. In this embodiment, the specific implementation process of the above S130 can be S131.

[0105] S131. Determine a third target current look-up table from multiple current look-up tables according to the temperature value and the sampled value of the voltage signal. The multiple current look-up tables belong to a voltage-temperature table. The third target current look-up table matches the charging step of the current state of the battery cell. Determine the target current value through the third target current look-up table.

[0106] One of the horizontal and vertical headers of the voltage-temperature table is the value of temperature, and the other is the value of voltage.

[0107] When using the charging performance test method of this embodiment to test the fast charging performance of a battery cell, during the test process, by collecting the temperature value and the sampled value of the voltage signal of the battery cell, according to the temperature value and the sampled value of the voltage signal, determine one of the current look-up tables that matches the charging step of the current state of the battery cell from the voltage-temperature table, and then determine the target current value by looking up the table. In this way, the charging current can be adjusted according to the real-time state of the voltage. Since the voltage can immediately reflect the charging state inside the battery cell, therefore, by using the voltage-temperature table to find the charging current, it can quickly respond to the charging state of the battery cell.

[0108] According to some embodiments of the present application, the sampled value of the voltage signal may specifically include the current voltage value and at least one historical voltage value. In the above S131, "determine one of the current look-up tables that matches the charging step of the current state of the battery cell from multiple current look-up tables belonging to the voltage-temperature table according to the temperature value and the sampled value of the voltage signal" may specifically include S310 to S330.

[0109] S310. Compare the current voltage value with the maximum historical voltage value among the current voltage value and at least one historical voltage value.

[0110] S320. In response to the comparison result that the current voltage value is less than the maximum historical voltage value, determine a third target current look-up table from multiple current look-up tables according to the temperature value and the maximum historical voltage value.

[0111] S330. In response to the comparison result that the current voltage value is greater than or equal to the maximum historical voltage value, determine a third target current look-up table from multiple current look-up tables according to the temperature value and the current voltage value.

[0112] During implementation, after the temperature value and the sampled value of the voltage signal are collected for the first time, then in S131, directly find the target current value through the voltage-temperature table according to the temperature value and the sampled value of the voltage signal collected for the first time. Starting from the second time the temperature value and the sampled value of the voltage signal are collected, execute S310 to S330, compare the newly collected current voltage value with the maximum historical voltage value among the previously collected historical voltage values, and find the target current value through the voltage-temperature table based on the current voltage value and the largest one among all historical voltage values.

[0113] For the voltage-temperature table, see, for example Figure 4 , Figure 4 In which, the unit of voltage is V (volt). Taking the collected temperature value as 10°C, the current voltage value as 3V, and the historical voltage values previously collected as 2.5V, 2.8V, 3.5V, 4V, then according to 10°C and 4V, from the Figure 4 voltage-temperature table shown, the target current value is found to be I 9H ’.

[0114] When using the charging performance test method of this embodiment to test the fast charging performance of a single battery cell, when looking up the charging current through the voltage-temperature table, the current voltage value and the maximum voltage among all historical voltage values are used as the basis for looking up the table.

[0115] It can be understood that in the technical solution of determining the target current value from the voltage-temperature table through the current voltage value, the found target current value may change significantly, so the charging current will show an obvious jump during the charging performance test, resulting in an obvious fluctuation in voltage during the charging performance test. For example, the charging current suddenly decreases from a large value, and the voltage suddenly drops; then, the charging current suddenly increases from a small value, and the voltage suddenly increases.

[0116] However, in this embodiment, by using the current voltage value and the maximum voltage among all historical voltage values as the input of the sampling value of the voltage signal to look up the table, the possibility of the found target current value mutating between small and large values is low, so that the stability of the charging current during the charging performance test can be improved, which is beneficial to reducing the fluctuation degree of the voltage during the charging performance test.

[0117] In the technical solution where the target signal includes a voltage signal, the charging cut-off condition may include at least one of the following conditions: the temperature value of the single battery cell reaches the preset temperature; the sampling value of the voltage signal reaches the pre-set charging cut-off voltage of the single battery cell.

[0118] According to some embodiments of the present application, the preset test information may further include a preset table lookup method, and the preset table lookup method is any one of the following methods: interpolation table lookup method and interval table lookup method.

[0119] The specific implementation manner of the above S430 may be: for a temperature value and / or a sampling value of the target signal not included in one of the current query tables, determine the target current value through the preset table lookup method.

[0120] That is to say, the tester can pre-configure the preset look-up table method on the host computer 510. When both the temperature value and the sampled value of the target signal are within the index range of one of the current look-up tables, that is, the judgment result of S410 is yes. Further, if the temperature value is the data in the temperature data set corresponding to one of the current look-up tables, and the sampled value of the target signal is the data in the target signal data set corresponding to one of the current look-up tables, that is, for the temperature value and the sampled value of the target signal included in one of the current look-up tables, the target current value can be directly found from one of the current look-up tables.

[0121] Among them Figure 3 The temperature data set corresponding to the shown temperature-SOC matrix table is (-25, -20, -15, -10, -5, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55), and the corresponding target signal data set is (0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%). Exemplarily, if the collected temperature value is 20 °C and the sampled value of SOC is 30%, then from Figure 3 the shown temperature-SOC matrix table, the target current value is found to be I 3J .

[0122] Further, if the temperature value is not the data in the temperature data set corresponding to one of the current look-up tables, and / or the sampled value of the target signal is not the data in the target signal data set corresponding to one of the current look-up tables, that is, for the temperature value and / or the sampled value of the target signal not included in one of the current look-up tables, the target current value can be determined by the preset look-up table method.

[0123] Exemplarily, if the collected temperature value is 8 °C and the sampled value of SOC is 15%, the target current value is calculated by the interpolation look-up table method, or the target current value is determined by the interval look-up table method. Taking the determination of the target current value by the interval look-up table method as an example, the interval where the temperature value is located is [5 °C, 10 °C], and the interval where SOC is located is [10%, 20%], and the corresponding currents to be looked up are I 1G 、I 1H 、I 2G 、I 2H , I 1G 、I 1H 、I 2G 、I 2H . The maximum value among I 1G 、I 1H 、I 2G 、I 2H can be used as the target current value, or the minimum value among I

[0124] In this embodiment, when at least one of the collected temperature value and the sampled value of the target signal is not included in one of the current look-up tables, the target current value is calculated by means of interpolation look-up or interval look-up based on the known data in the current look-up table. In this way, the target current value can be obtained by combining look-up and simple calculation. On the one hand, compared with the technical solution of directly looking up the table, the error of the obtained target current value is smaller, which is beneficial to making the test result of the charging performance test more accurate. On the other hand, the calculation amount is small, which is beneficial to improving the test efficiency of the charging performance test.

[0125] According to some embodiments of the present application, the preset test information may further include at least one interpolation look-up table corresponding to each of the multiple current look-up tables.

[0126] The specific implementation manner of S430 above may be: for the temperature value and / or the sampled value of the target signal not included in one of the current look-up tables, obtain the target current value from the interpolation look-up table corresponding to one of the current look-up tables.

[0127] Among them, the interpolation look-up table is obtained by pre-calculating possible interpolation results on the basis of the current look-up table to which it belongs. The tester can pre-configure the interpolation look-up table on the host computer 510. The interpolation look-up table is similar to the current look-up table to which it belongs, and one of its horizontal header and vertical header is the value of temperature and the other is the value of the target signal.

[0128] When both the temperature value and the sampled value of the target signal are within the index range of one of the current look-up tables, that is, the judgment result of S410 is yes. Further, if the temperature value is not the data in the temperature dataset corresponding to one of the current look-up tables, and / or the sampled value of the target signal is not the data in the target signal dataset corresponding to one of the current look-up tables, that is, for the temperature value and / or the sampled value of the target signal not included in one of the current look-up tables, the target current value can be found from the interpolation look-up table.

[0129] In this embodiment, when at least one of the collected temperature value and the sampled value of the target signal is not included in one of the current look-up tables, the target current value is obtained by querying from the interpolation look-up table subordinate to one of the current look-up tables. In this way, only the interpolation look-up table is relied on for searching and matching, further reducing the calculation amount, and also reducing the tiny error brought by the calculation, so that the operation efficiency of the charging performance test method is further improved, and thus the charging performance test efficiency is improved.

[0130] According to some embodiments of the present application, "collecting the temperature value of the battery cell" in S120 may be: collecting the temperature values of multiple sampling points on the battery cell. Correspondingly, "according to the temperature value and the sampled value of the target signal" in S130 may be: according to the temperature values of multiple sampling points and the sampled value of the target signal.

[0131] Among them, the lower computer 530 may include an inspection board, on which a plurality of temperature sensor interfaces are provided. The plurality of temperature sensor interfaces are respectively connected to a plurality of temperature sensors 532 in one-to-one correspondence. Each temperature sensor 532 is used to detect the temperature of a sampling point. Alternatively, the lower computer 530 may include a plurality of temperature sensors 532.

[0132] In S120, the lower computer 530 may collect the temperature values of a plurality of sampling points on the battery cells. The number of sampling points is greater than or equal to 2, and specifically, any value among 2, 3, 4, 6, 8, etc. may be selected. As an example, the number of sampling points is greater than or equal to 8, and correspondingly, 8 temperature values are collected.

[0133] In this embodiment, by collecting the temperature values of a plurality of sampling points, a certain temperature value among the temperature values of the plurality of sampling points can be selected for look-up according to requirements, thereby facilitating the optimization of the charging performance test process according to different requirements.

[0134] In some embodiments, in S130, look-up can be performed according to any one of the temperature values, the maximum temperature value, the minimum temperature value, or the intermediate value among the temperature values of the plurality of sampling points. In some other embodiments, in S130, look-up can be performed according to the average temperature value of the temperature values of the plurality of sampling points. In contrast, in the technical solution of performing look-up according to the average temperature value of the temperature values of the plurality of sampling points, the average temperature value can more accurately reflect the overall temperature level of the battery cell, can reduce the interference of abnormal temperatures at some sampling points on the determined target current value, and improve the accuracy of the fast charging test data.

[0135] According to some embodiments of the present application, the above S130 is repeatedly executed every first preset duration. The first preset duration is T1, and the value range of T1 can be designed as 800 ms (milliseconds) ≤ T1 ≤ 2 s (seconds).

[0136] During implementation, the tester can preset T1 on the upper computer 510. T1 can be any value among 800 ms, 1 s, 1200 ms, 1500 ms, and 2 s.

[0137] In this embodiment, by making 800 ms ≤ T1 ≤ 2 s, on the one hand, due to T1 ≤ 2 s, the interval duration for looking up the table based on the temperature value and the sampled value of the target signal to output the target current value is not too large, so the dynamic change frequency of the charging current during the charging performance test is relatively fast, which is conducive to reliably and quickly responding to the charging state of the battery cell. On the other hand, due to 800 ms ≤ T1, the interval duration for looking up the table based on the temperature value and the sampled value of the target signal to output the target current value is not too small, so the change frequency of the charging current during the charging performance test is not too fast, reducing the possibility that the electrode reaction rate cannot be adjusted in time due to the sudden change of the charging current, which is conducive to reducing battery polarization.

[0138] Figure 5 It is a schematic comparison diagram of the charging curve in some embodiments of the present application and the charging curve of constant current charging. Combining Figure 5 , it can be understood that in some related technologies, during the process of performing a charging performance test on a battery cell, the charging method for the battery cell is constant current charging, and the charging curve is shown by a dotted line in Figure 5 . The charging current changes suddenly at point A and point B. For the charging performance test method of this embodiment, the charging current is adjusted every first preset duration, and in addition, 800 ms (milliseconds) ≤ T1 ≤ 2 s (seconds), the median machine 520 outputs the target current value relatively densely, and the charging curve is shown by a solid line in Figure 5 . It can be seen that the charging current changes smoothly during the charging performance test.

[0139] According to some embodiments of the present application, the step of collecting the temperature value of the battery cell in S120 is repeatedly executed every second preset duration, and the step of collecting the sampled value of the target signal in S120 is repeatedly executed every third preset duration. The second preset duration is T2, and the third preset duration is T3. T1, T2, and T3 can be designed to satisfy: T1 > T2, T1 > T3.

[0140] During implementation, the tester can preset T1, T2, and T3 on the host computer 510. T2 and T3 can be equal or unequal. In some embodiments, T2 > T3. The value range of T2 can be 450 ms (milliseconds) ≤ T1 ≤ 550 ms, and the value range of T3 can be 8 ms ≤ T2 ≤ 12 ms. Among them, T2 can be selected as any value among 450 ms, 500 ms, and 550 ms, and T3 can be selected as any value among 8 ms, 9 ms, 10 ms, 11 ms, and 12 ms.

[0141] During the charging performance test of this embodiment, the dynamic change frequency of the charging current is moderate. On the basis of reducing possible battery polarization, by making both the second preset duration and the third preset duration less than the first preset duration, the temperature value and the sampling value of the target signal of the battery cell can be monitored at a high frequency, which is beneficial to improving the real-time performance of the temperature and target signal monitoring, and further beneficial to the accuracy of the target current value determined accordingly, bringing a positive effect on improving the accuracy of the charging performance test.

[0142] Based on the same technical concept, an embodiment of the present application provides a charging performance test instrument, as Figure 1 shown, including: a host computer 510, a middle computer 520, and a slave computer 530. The middle computer 520 is communicatively connected to both the host computer 510 and the slave computer 530, and the slave computer 530 is used to connect to the battery cell.

[0143] Among them, the host computer 510 is configured to, in response to a configuration operation of the charging test conditions, obtain the configured preset test information, and send the preset test information to the middle computer 520; the preset test information includes a preset current value and a plurality of current query tables corresponding to a plurality of charging steps one by one.

[0144] Among them, the slave computer 530 is configured to collect the temperature value and the sampling value of the target signal of the battery cell, and send the temperature value and the sampling value of the target signal to the middle computer 520; the target signal is related to the electrical signal of the battery cell.

[0145] Among them, the middle computer 520 is configured to receive the preset test information sent by the host computer 510, receive the temperature value and the sampling value sent by the slave computer 530, determine, according to the temperature value and the sampling value of the target signal, one of the current query tables that matches the charging step of the current state of the battery cell from a plurality of current query tables, determine the target current value through one of the current query tables, and send the target current value to the slave computer 530. Among them, "determining the target current value through one of the current query tables" may specifically include: determining whether both the temperature value and the sampling value of the target signal are within the index range of one of the current query tables; in response to the judgment result being no, setting the preset current value as the target current value; in response to the judgment result being yes, determining the target current value through one of the current query tables.

[0146] Among them, the slave computer 530 is further configured to, after receiving the target current value sent by the middle computer 520, charge the battery cell and make the charging current be the target current value, and return to the step of the slave computer 530 collecting the temperature value and the sampling value of the target signal of the battery cell to execute cyclically.

[0147] The host computer 510 refers to a machine that can directly issue control commands, and specifically can be at least one of a server, a laptop computer, a tablet computer, a desktop computer, a smart phone, etc. The tester can interact with the host computer 510. In some embodiments, the host computer 510 may include a Battery Test System (BTS). The tester can perform a configuration operation on the charging test conditions in the battery test system of the host computer 510, so that the host computer 510 receives the configured preset test information. The configuration operation can be a voice operation or a touch operation. That is, in some embodiments, the host computer 510 can receive a voice command issued by the tester and obtain the configured preset test information according to the voice command. In some embodiments, the host computer 510 has at least one touch button and / or at least one physical button. A touch button refers to a button that triggers a corresponding function through a touch operation. For example, the host computer 510 may include a display interface. The tester performs a configuration operation on the touch button of the display interface, so that the host computer 510 receives the configured preset test information.

[0148] The middle computer 520 can communicate with the host computer 510 and the lower computer 530 by means of CAN (Controller Area Network), Modbus protocol, Ethernet / IP protocol, etc.

[0149] The lower computer 530 specifically may include a temperature sensor 532 and a target signal detection element 533. The temperature sensor 532 is used to detect the temperature of the battery cell, and the target signal detection element 533 is used to detect the target signal. The lower computer 530 may further include a charge and discharge machine 531. The charge and discharge machine 531 receives the target current value output by the middle computer 520, charges the battery cell and makes the charging current the target current value.

[0150] In some embodiments, the middle computer 520 may be configured to:

[0151] According to the sampled values of the temperature value and the state of charge signal, determine a first target current look-up table from multiple current look-up tables. The multiple current look-up tables belong to a temperature-SOC matrix table. The first target current look-up table matches the charging step of the current state of the battery cell. Determine a first current value through the first target current look-up table;

[0152] According to the sampled values of the temperature value and the power signal, determine a second target current look-up table from multiple current look-up tables. The multiple current look-up tables belong to a power-temperature matrix table. The second target current look-up table matches the charging step of the current state of the battery cell. Determine a second current value through the second target current look-up table;

[0153] Determine the smaller one of the first current value and the second current value as the target current value.

[0154] In some embodiments, the median machine 520 can be configured to:

[0155] According to the temperature value and the sampled value of the voltage signal, determine a third target current query table from multiple current query tables. The multiple current query tables belong to a voltage-temperature table, and the third target current query table matches the charging step of the current state of the battery cell. Determine the target current value through the third target current query table.

[0156] In some embodiments, the sampled value of the voltage signal includes the current voltage value and at least one historical voltage value; the median machine 520 can be configured to:

[0157] Compare the current voltage value with the maximum historical voltage value among at least one historical voltage value;

[0158] In response to the comparison result that the current voltage value is less than the maximum historical voltage value, determine a third target current query table from multiple current query tables according to the temperature value and the maximum historical voltage value;

[0159] In response to the comparison result that the current voltage value is greater than or equal to the maximum historical voltage value, determine a third target current query table from multiple current query tables according to the temperature value and the current voltage value.

[0160] In some embodiments, the preset test information further includes a preset table lookup method, and the preset table lookup method is any one of the following methods: interpolation table lookup method and interval table lookup method; the median machine 520 can be configured to:

[0161] For the temperature value and / or the sampled value of the target signal not included in one of the current query tables, determine the target current value through the preset table lookup method.

[0162] In some embodiments, the median machine 520 can be configured to execute the step of determining one of the current query tables that matches the charging step of the current state of the battery cell from multiple current query tables according to the temperature value and the sampled value of the target signal every first preset duration, and determine the target current value through one of the current query tables. The first preset duration is T1, and 800 ms ≤ T1 ≤ 2 s.

[0163] In some embodiments, the lower machine 530 can be configured to execute the step of collecting the temperature value every second preset duration, and the lower machine 530 can be configured to execute the step of collecting the sampled value of the target signal every third preset duration. The second preset duration is T2, the third preset duration is T3, T1 > T2, and T1 > T3.

[0164] Figure 6Schematic diagram of an electronic device provided by some embodiments of the present application. Embodiments of the present application provide an electronic device for charging performance testing, such as Figure 6 As shown, the electronic device 600 may include at least one processor 605, a memory 607, (multiple) communication interfaces 602, a display device 601, other input / output (I / O) devices 603, and one or more mass storage devices 606 that can communicate with each other, such as via a bus 604 or other suitable connections. Instructions are stored on the memory 607, and when executed by the processor 605, the instructions cause the processor 605 to execute the charging performance testing method as in the above embodiments.

[0165] The processor 605 may be a single processing unit or multiple processing units, and all processing units may include a single or multiple computing units or multiple cores. The processor 605 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any computing device that manipulates signals based on operation instructions. Among other capabilities, the processor 605 may be configured to obtain and execute computer-readable instructions stored in the memory 607, the mass storage device 606, or other computer-readable media, such as program code of an operating system 608, program code of an application 609, program code of other programs 610, etc.

[0166] The memory 607 and the mass storage device 606 are examples of computer-readable storage media for storing instructions, and the instructions are executed by the processor 605 to implement the various functions described above. For example, the memory 607 generally may include both volatile memory and non-volatile memory (e.g., RAM, ROM, etc.). In addition, the mass storage device 606 generally may include a hard disk drive, a solid-state drive, removable media, including external and removable drives, memory cards, flash memory, floppy disks, optical discs (e.g., CDs, DVDs), storage arrays, network-attached storage, storage area networks, etc. The memory 607 and the mass storage device 606 may both be collectively referred to as memory or computer-readable storage media in this article, and may be non-transitory media capable of storing computer-readable, processor-executable program instructions as computer program code, and the computer program code may be executed by the processor 605 as a specific machine configured to implement the operations and functions described in the examples herein.

[0167] Multiple programs can be stored on the mass storage device 606. These programs include an operating system 608, one or more application programs 609, other programs 610, and program data 611, and they can be loaded into the memory 607 for execution. Examples of such application programs or program modules can include, for example, computer program logic (e.g., computer program code or instructions) for implementing the following components / functions: a charging performance test instrument (including a host computer 510, a middle computer 520, and a lower computer 530), a charging performance test method 100 (including any suitable steps of the charging performance test method 100), and / or additional embodiments described herein.

[0168] Although illustrated as being stored in the memory 607 of the electronic device 600 in Figure 6 , the operating system 608, application programs 609, other programs 610, and program data 611, or portions thereof, can be implemented using any form of computer-readable medium accessible by the electronic device 600.

[0169] One or more communication interfaces 602 are used to exchange data with other electronic devices, such as via a network, a direct connection, etc. Such communication interfaces can be one or more of the following: any type of network interface (e.g., a network interface card (NIC)), a wired or wireless (such as IEEE 802.11 wireless LAN (WLAN)) wireless interface, a Worldwide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth TM interface, a Near Field Communication (NFC) interface, etc. The communication interface 602 can facilitate communication within a variety of network and protocol types, including wired networks (e.g., LAN, cable, etc.) and wireless networks (e.g., WLAN, cellular, satellite, etc.), the Internet, etc. The communication interface 602 can also provide communication with external storage devices (not shown) such as in a storage array, a network-attached storage, a storage area network, etc.

[0170] In some examples, a display device 601, such as a monitor, can be included for displaying information and images to the user. Other I / O devices 603 can be computing devices that receive various inputs from the user and provide various outputs to the user, and can include touch input devices, gesture input devices, cameras, keyboards, remote controls, mice, printers, audio input / output devices, etc.

[0171] The techniques described herein can be supported by these various configurations of the electronic device 600 and are not limited to the specific examples of the techniques described herein. For example, the functionality can also be implemented in whole or in part on a "cloud" using a distributed system. The cloud comprises and / or represents a platform for resources. The platform abstracts the underlying functionality of the hardware (e.g., servers) and software resources of the cloud. Resources can include applications and / or data that can be used when performing computational processing on servers remote from the electronic device 600. Resources can also include services provided over the Internet and / or over a subscriber network such as a cellular or Wi-Fi network. The platform can abstract the resources and functionality to connect the electronic device 600 with other computing devices. Accordingly, the implementation of the functionality described herein can be distributed throughout the cloud. For example, the functionality can be implemented partially on the electronic device 600 and partially through a platform that abstracts the functionality of the cloud.

[0172] An embodiment of the present application also provides a computer-readable storage medium having instructions stored thereon that, when executed alone or jointly by one or more processors of an electronic device, cause the electronic device to perform the method in any of the above embodiments.

[0173] Computer-readable storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs), or other optical storage devices, magnetic cassettes, magnetic tapes, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory medium that can be used to store information accessible by a computer device.

[0174] An embodiment of the present application also provides a computer program product comprising instructions that, when executed alone or jointly by one or more processors of the electronic device 600, cause the electronic device 600 to perform the method in any of the above embodiments.

[0175] The foregoing description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other objects, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically exemplified.

[0176] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is described only for purposes of illustration and should not be construed as a limitation of the present application.

[0177] In an embodiment of the present application, as Figure 1As shown in the figure, a charging performance test instrument includes: a host computer 510, a middle computer 520, and a slave computer 530. Among them, the tester can interact with the host computer 510. The middle computer 520 is communicatively connected to both the host computer 510 and the slave computer 530. The slave computer 530 is used to connect to a single battery cell.

[0178] Example 1

[0179] The tester performs a configuration operation on the charging test conditions in the battery test system of the host computer 510, so that the host computer 510 receives the configured preset test information. The preset test information includes a temperature-SOC matrix table, a power-temperature matrix table, a preset current value of 600 A, a preset table lookup method, a first preset duration T1 of 1 s, a second preset duration T2 of 500 ms, and a third preset duration T3 of 10 ms. Among them, the temperature-SOC matrix table includes multiple current lookup tables corresponding one by one to multiple charging steps, and the power-temperature matrix table also includes multiple current lookup tables corresponding one by one to multiple charging steps.

[0180] The host computer 510 sends the preset test information to the middle computer 520.

[0181] The slave computer 530 collects the temperature values of 8 sampling points on the single battery cell every 500 ms, collects the SOC and power every 10 ms, and sends the collected temperature values, sampling values of the SOC signal, and sampling values of the power signal to the middle computer 520.

[0182] After receiving the preset test information, the middle computer 520 performs the following steps every 1 s:

[0183] According to the average temperature value of the temperature values of 8 sampling points and the sampling value of the SOC, determine one of the multiple current lookup tables belonging to the temperature-SOC matrix table that matches the charging step of the current state of the single battery cell, and determine the first current value through one of the current lookup tables belonging to the temperature-SOC matrix table;

[0184] According to the average temperature value of the temperature values of 8 sampling points and the sampling value of the power signal, determine one of the multiple current lookup tables belonging to the power-temperature matrix table that matches the charging step of the current state of the single battery cell, and determine the second current value through one of the current lookup tables belonging to the power-temperature matrix table;

[0185] Determine the smaller of the first current value and the second current value as the target current value, and send the target current value to the slave computer 530.

[0186] The lower computer 530 adjusts the charging current according to the target current value transmitted by the middle computer 520. Return to the lower computer 530 to collect the temperature value, SOC, and power of the battery cell, and loop until the charging cut-off condition is reached.

[0187] Among them, in the process of determining the first current value from one of the current lookup tables subordinate to the temperature-SOC matrix table, first judge whether the sampled values of the temperature value and SOC are both within the index range of one of the current lookup tables subordinate to the temperature-SOC matrix table. In response to the judgment result being no, set the value of the target current value to the preset current value (i.e., 600A). In response to the judgment result being yes, if the temperature value is not the data in the temperature dataset corresponding to one of the current lookup tables, and / or the sampled value of the SOC is not the data in the target signal dataset corresponding to one of the current lookup tables, determine the target current value by the preset lookup method.

[0188] Among them, the charging cut-off conditions include at least one of the following conditions: the temperature value of the battery cell reaches the preset temperature; the sampled value of the state-of-charge signal reaches 100%. The preset temperature is 50°C or 60°C.

[0189] Example 2

[0190] Similar to Embodiment 1, the difference is that: in Embodiment 2, the preset test information includes a voltage-temperature matrix table, a preset current value of 600A, a preset lookup method, a first preset duration T1 of 1s, a second preset duration T2 of 500ms, and a third preset duration T3 of 10ms. Among them, the voltage-temperature matrix table includes multiple current lookup tables corresponding to multiple charging steps one by one.

[0191] The lower computer 530 collects the temperature values of 8 sampling points on the battery cell every 500ms, collects the voltage every 10ms, and sends the collected temperature values and the sampled values of the voltage signal to the middle computer 520.

[0192] The steps that the middle computer 520 executes every 1s include:

[0193] Calculate the average temperature value according to the temperature values of 8 sampling points;

[0194] Compare the current voltage value with the maximum historical voltage value among at least one historical voltage value;

[0195] According to the maximum value among the average temperature value, the current voltage value, and the maximum historical voltage value, determine one of the current lookup tables that matches the charging step of the current state of the battery cell from multiple current lookup tables, and determine the second current value through one of the current lookup tables.

[0196] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing the charging performance of a battery cell, characterized in that Including: In response to a configuration operation for charging test conditions, obtaining the configured preset test information; The preset test information includes a preset current value and a plurality of current query tables corresponding one by one to a plurality of charging steps; Collecting the temperature value of the battery cell every second preset time period, and collecting the sampling value of the target signal of the battery cell every third preset time period; The target signal is related to the electrical signal of the battery cell; According to the temperature value and the sampling value of the target signal, determining one of the plurality of current query tables included in the preset test information, the one current query table matching the charging step corresponding to the current state of the battery cell, and determining the target current value through the one current query table every first preset time period; The determining the target current value through the one current query table includes: judging whether the temperature value and the sampling value of the target signal are both within the index range of the one current query table, and in response to the judgment result being no, setting the preset current value as the target current value, and in response to the judgment result being yes, determining the target current value through the one current query table; Charging the battery cell with the charging current being the target current value, returning to the step of collecting the temperature value of the battery cell and the sampling value of the target signal, and circularly executing until the charging cut-off condition is reached; Wherein, the first preset time period is T1, the second preset time period is T2, the third preset time period is T3, and T1>T2, T1>T3.

2. The charging performance test method according to claim 1, characterized in that, The target signal includes a state of charge signal, the preset test information includes a temperature-SOC matrix table, and the temperature-SOC matrix table includes the plurality of current query tables; And / or, the target signal includes a power signal, the preset test information includes a power-temperature matrix table, and the power-temperature matrix table includes the plurality of current query tables.

3. The charging performance testing method according to claim 2, characterized in that, The target signal includes a state of charge signal and a power signal, and the preset test information includes a temperature-SOC matrix table and a power-temperature matrix table; The determining one of the plurality of current query tables included in the preset test information according to the temperature value and the sampling value of the target signal, the one current query table matching the charging step corresponding to the current state of the battery cell, and determining the target current value through the one current query table includes: According to the temperature value and the sampling value of the state of charge signal, determining a first target current query table from the plurality of current query tables, the plurality of current query tables belonging to the temperature-SOC matrix table, the first target current query table matching the charging step of the current state of the battery cell, and determining a first current value through the first target current query table; Determine a second target current lookup table from the multiple current lookup tables according to the temperature value and the sampled value of the power signal. The multiple current lookup tables belong to the power-temperature matrix table, and the second target current lookup table matches the charging step of the current state of the battery cell. Determine a second current value through the second target current lookup table; Determine the smaller one of the first current value and the second current value as the target current value.

4. The charging performance test method according to claim 1, wherein The target signal is a voltage signal, the preset test information includes a voltage-temperature table, and the voltage-temperature table includes the multiple current lookup tables; The method of determining one of the current lookup tables from the multiple current lookup tables included in the preset test information according to the temperature value and the sampled value of the target signal, where the one current lookup table matches the charging step corresponding to the current state of the battery cell, and determining the target current value through the one current lookup table includes: Determine a third target current lookup table from the multiple current lookup tables according to the temperature value and the sampled value of the voltage signal. The multiple current lookup tables belong to the voltage-temperature table, and the third target current lookup table matches the charging step of the current state of the battery cell; determine the target current value through the third target current lookup table.

5. The charging performance testing method according to claim 4, wherein The sampled value of the voltage signal includes a current voltage value and at least one historical voltage value; The method of determining a third target current lookup table from the multiple current lookup tables according to the temperature value and the sampled value of the voltage signal includes: Compare the current voltage value with the maximum historical voltage value among the at least one historical voltage value; In response to the comparison result that the current voltage value is less than the maximum historical voltage value, determine the third target current lookup table from the multiple current lookup tables according to the temperature value and the maximum historical voltage value; In response to the comparison result that the current voltage value is greater than or equal to the maximum historical voltage value, determine the third target current lookup table from the multiple current lookup tables according to the temperature value and the current voltage value.

6. The charging performance test method according to claim 1, wherein The preset test information further includes a preset lookup method, and the preset lookup method is any one of the following methods: interpolation lookup method and interval lookup method; The method of determining the target current value through the one current lookup table includes: For the temperature value and / or the sampled value of the target signal not included in the one current lookup table, determine the target current value through the preset lookup method.

7. The charging performance test method according to claim 6, characterized in that, The preset test information further includes at least one interpolation lookup table corresponding to each current lookup table in the multiple current lookup tables; the method of determining the target current value through the one current lookup table includes: For the temperature value and / or the sampled value of the target signal not included in the one current lookup table, obtain the target current value from the interpolation lookup table corresponding to the one current lookup table.

8. The charging performance testing method according to claim 1, characterized in that The method of collecting the temperature value of the battery cell includes: collecting the temperature values of multiple sampling points on the battery cell; Said according to the temperature value and the sampled value of the target signal includes: according to the temperature values of the multiple sampling points and the sampled value of the target signal.

9. The charging performance test method according to any one of claims 1 to 8, characterized in that 800ms ≤ T1 ≤ 2s.

10. A charging performance testing instrument, characterized in that, Includes: A host computer, a middle computer, and a lower computer. The middle computer is communicatively connected to both the host computer and the lower computer, and the lower computer is used to connect to a battery cell; The host computer is configured to, in response to a configuration operation for charging test conditions, obtain the configured preset test information and send the preset test information to the middle computer; the preset test information includes a preset current value and a plurality of current query tables corresponding one by one to a plurality of charging steps; The lower computer is configured to collect the temperature value of the battery cell every second preset time period, and collect the sampled value of the target signal of the battery cell every third preset time period, and send the temperature value and the sampled value of the target signal to the middle computer; the target signal is related to the electrical signal of the battery cell; The middle computer is configured to receive the preset test information sent by the host computer, receive the temperature value and the sampled value sent by the lower computer, and according to the temperature value and the sampled value of the target signal, determine one of the current query tables that matches the charging step of the current state of the battery cell from the plurality of current query tables, and determine the target current value through the one current query table every first preset time period, and send the target current value to the lower computer; said determining the target current value through the one current query table includes: determining whether both the temperature value and the sampled value of the target signal are within the index range of the one current query table, and in response to the judgment result being no, setting the preset current value as the target current value, and in response to the judgment result being yes, determining the target current value through the one current query table; The lower computer is configured to, upon receiving the target current value sent by the middle computer, charge the battery cell with the charging current being the target current value, and return to the step of the lower computer collecting the temperature value and the sampled value of the target signal of the battery cell, and loop until the charging cut-off condition is reached; wherein, the first preset time period is T1, the second preset time period is T2, the third preset time period is T3, and T1 > T2, T1 > T3.

11. An electronic device for charging performance testing, characterized in that, Includes: At least one processor; And At least one memory communicatively connected to the at least one processor. The at least one memory stores instructions that, when executed alone or jointly by the at least one processor, cause the electronic device to perform the charging performance test method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that, Stores instructions that, when executed alone or jointly by one or more processors of an electronic device, cause the electronic device to perform the charging performance test method according to any one of claims 1 to 9.

13. A computer program product, characterized in that, Includes instructions that, when executed alone or jointly by one or more processors of an electronic device, cause the electronic device to perform the charging performance test method according to any one of claims 1 to 9.

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