Charging performance test method and apparatus, electronic device, medium, and program

Abstract

The invention provides a charging performance test method and apparatus, an electronic device, a medium and a program, and belongs to the technical field of batteries. The charging performance test method comprises the steps of obtaining configured preset test information in response to a configuration operation on a charging test condition; collecting a temperature value of the single battery and a sampling value of the target signal; according to the temperature value and the sampling value of the target signal, one current look-up table is determined from a plurality of current look-up tables, and a target current value is determined through one current look-up table; and charging the single battery and enabling the charging current to be the target current value, returning to the step of collecting the temperature value of the single battery and the sampling value of the target signal, and circularly executing until a charging cut-off condition is met. According to the method, the charging current can be adjusted according to the real-time state of the single battery, so that the accuracy of the charging performance test of the single battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a charging performance testing method and instrument, electronic equipment, medium and program. Background Art

[0002] Energy conservation and emission reduction are the key to sustainable social development. Rechargeable batteries have the characteristics of storing or releasing energy as needed, 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 in its development.

[0003] In order to ensure that the battery's fast charging capability is qualified, the battery's charging performance test is necessary. How to improve the accuracy of the battery's charging performance test 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 technology. To this end, one purpose of the present application is to provide a charging performance test method and instrument, electronic equipment, medium and program, which can adjust the charging current according to the real-time status of the battery cell, thereby improving the accuracy of the charging performance test of the battery cell.

[0005] The embodiment of the first aspect of the present application provides a method for testing the charging performance of a battery cell, comprising: In response to the configuration operation of the charging test condition, the configured preset test information is obtained; the preset test information includes a preset current value and a plurality of current query tables corresponding to a plurality of charging steps; Collect the temperature value of the battery cell and the sampling value of the target signal; the target signal is related to the electrical signal of the battery cell; According to the temperature value and the sampled value of the target signal, one of the current query tables is determined from the multiple current query tables included in the preset test information, wherein one of the current query tables matches the charging step corresponding to the current state of the battery cell, and the target current value is determined 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 sampled value of the target signal are both within the index range of one of the current query tables, and in response to a negative determination, setting the preset current value as the target current value, and in response to a positive determination, determining the target current value through one of the current query tables; The battery cell is charged and the charging current is set to the target current value, and the process returns to the step of collecting the temperature value of the battery cell and the sampling value of the target signal, and the process is executed in a loop until the charging cut-off condition is reached.

[0006] By using the charging performance test method of this embodiment, the charging current can be adjusted according to the real-time status of the battery cell during the fast charging test, so that the charging current changes dynamically, and 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, which 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 a power supply system for electrical equipment such as energy storage devices and electric vehicles. Since the accuracy of the charging performance test of the battery cells is high, it can have a positive effect on the accuracy of the fast charging capability prediction of the power supply system.

[0007] In some embodiments, 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 multiple current query tables. This embodiment enables the charging current to be adjusted according to the real-time state of the SOC, so that the appropriate charging current can be set at different SOC stages, which is conducive to reducing the risk of overcharging.

[0008] In some embodiments, the target signal includes a power signal, the preset test information includes a 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 power, which is conducive to maximizing the power utilization during the fast charging test and improving the efficiency of the fast charging test.

[0009] In some embodiments, 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; According to the temperature value and the sampled value of the target signal, one of the current query tables is determined from the multiple current query tables included in the preset test information, wherein one of the current query tables matches the charging step of the current state of the battery cell, and the target current value is determined through one of the current query tables, including: According to the temperature value and the sampled value of the state of charge signal, a first target current lookup table is determined from multiple current lookup tables, the multiple current lookup tables belong to the temperature-SOC matrix table, the first target current lookup table matches the charging step of the current state of the battery cell, and the first current value is determined by the first target current lookup table; According to the temperature value and the sampling value of the power signal, a second target current query table is determined from a plurality of current query tables, the plurality of current query tables belong to the power-temperature matrix table, the second target current query table matches the charging step of the current state of the battery cell, and the second current value is determined by the second target current query table; The smaller one of the first current value and the second current value is determined as the target current value.

[0010] This embodiment ensures that the charging current will not exceed the safe charging range during the charging performance test, thereby improving the accuracy and safety of the charging performance test.

[0011] In some embodiments, the target signal is a voltage signal, the preset test information includes a voltage-temperature table, and the voltage-temperature table includes a plurality of current lookup tables; According to the temperature value and the sampled value of the target signal, one of the current query tables is determined from the multiple current query tables included in the preset test information, wherein one of the current query tables matches the charging step of the current state of the battery cell, and the target current value is determined through one of the current query tables, including: According to the sampling values ​​of the temperature value and the voltage signal, a third target current query table is determined from multiple current query tables, the multiple current query tables belong to the voltage-temperature table, the third target current query table matches the charging step of the current state of the battery cell, and the target current value is determined through the third target current query table.

[0012] This embodiment enables the charging current to be adjusted according to the real-time state of the voltage during the charging performance test.

[0013] In some embodiments, the sampled value of the voltage signal includes a current voltage value and at least one historical voltage value; Determining a third target current lookup table from a plurality of current lookup tables according to the temperature value and the sampled value of the voltage signal, including: Comparing the current voltage value with a maximum historical voltage value among at least one historical voltage value; In response to the comparison result being that the current voltage value is less than the maximum historical voltage value, determining a third target current lookup table from a plurality of current lookup tables according to the temperature value and the maximum historical voltage value; In response to the comparison result being that the current voltage value is greater than or equal to the maximum historical voltage value, a third target current lookup table is determined from a plurality of current lookup tables according to the temperature value and the current voltage value.

[0014] This embodiment uses the current voltage value and the maximum voltage of all historical voltage values ​​as the input of the sampling value of the voltage signal to look up the table, so that the possibility of the target current value found changing suddenly between small and large values ​​is low, which is beneficial to reducing the voltage fluctuation degree during the charging performance test.

[0015] 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: an interpolation table lookup method and an interval table lookup method; Determine the target current value using one of the current lookup tables, including: For a temperature value and / or a sampled value of a target signal that is not included in one of the current lookup tables, a target current value is determined by a preset table lookup method.

[0016] In this way, the target current value can be obtained by combining table lookup and simple calculation, with a small amount of calculation, which is conducive to improving the test efficiency of the charging performance test.

[0017] In some embodiments, the preset test information further includes at least one interpolation lookup table corresponding to each current lookup table in the plurality of current lookup tables; determining the target current value through one of the current lookup tables includes: For a temperature value and / or a sampled value of a target signal not included in one of the current lookup tables, a target current value is obtained from an interpolation lookup table corresponding to one of the current lookup tables.

[0018] 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 lookup tables, it is only necessary to rely on the interpolation lookup table for search and matching, which further reduces the amount of calculation, further improves the operating efficiency of the charging performance test method, and can also reduce the slight errors caused by the calculation.

[0019] In some embodiments, collecting the temperature value of the battery cell includes: collecting temperature values ​​of multiple sampling points on the battery cell; According to the temperature value and the sampling value of the target signal, including: according to the temperature values ​​and the sampling values ​​of the target signal at multiple sampling points.

[0020] In some embodiments, the step of determining the target current value through one of the current lookup tables is repeated every first preset time period; the first preset time period is T1, 800ms≤T1≤2s.

[0021] This embodiment makes the dynamic change frequency of the charging current moderate during the charging performance test, and can balance the response rate to the charging state of the battery cell and the battery polarization risk.

[0022] In some embodiments, the step of collecting temperature values ​​is repeated every second preset time period; the step of collecting sampling values ​​of target signals is repeated every third preset time period; the second preset time period is T2, the third preset time period is T3, T1>T2, T1>T3.

[0023] This embodiment enables high-frequency monitoring of the temperature value of the battery cell and the sampling value of the target signal, so as to improve the real-time performance of the temperature and target signal monitoring.

[0024] The embodiment of the second aspect of the present application provides a charging performance test instrument, which includes: an upper computer, a middle computer and a lower computer, the middle computer is communicatively connected with the upper computer and the lower computer, and the lower computer is used to connect with a battery cell; The upper computer is configured to, in response to a configuration operation of a charging test condition, obtain the configured preset test information and send the preset test information to the intermediate computer; the preset test information includes a preset current value and a plurality of current query tables corresponding to a plurality of charging steps; The lower computer is configured to collect the temperature value of the battery cell and the sampled value of the target signal, 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 intermediate computer is configured to receive preset test information sent by the upper computer, receive temperature values ​​and sampling values ​​sent by the lower computer, determine one current query table 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 sampling value of the target signal, determine the target current value through one of the current query tables, and transmit the target current value to the lower computer; 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, in response to the judgment result being no, setting the preset current value to 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; 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, 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 execute in a loop until the charging cut-off condition is reached.

[0025] An embodiment of the third aspect of the present application provides an electronic device for charging performance testing, comprising: at least one processor; and at least one memory communicatively connected to the at least one processor, the at least one memory storing instructions, which, when executed individually or collectively by the at least one processor, enable the electronic device to execute the charging performance testing method in the above embodiment.

[0026] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium storing instructions, which, when executed individually or collectively by one or more processors of an electronic device, enable the electronic device to execute the charging performance testing method in the above embodiment.

[0027] An embodiment of the fifth aspect of the present application provides a computer program product, including instructions, which, when executed individually or collectively by one or more processors of an electronic device, enable the electronic device to execute the charging performance testing method in the above embodiment.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0030] Figure 1 A schematic diagram of the structure of a charging performance test instrument provided in some embodiments of the present application; Figure 2 A schematic diagram of a charging performance test method provided in some embodiments of the present application; Figure 3 A schematic diagram of a temperature-SOC matrix table in some embodiments of the present application; Figure 4 A schematic diagram of a voltage-temperature table in some embodiments of the present application; Figure 5 A schematic diagram comparing the charging curves in some embodiments of the present application with the charging curves of constant current charging; Figure 6 A schematic diagram of an electronic device provided for some embodiments of the present application. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "multiple" 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).

[0037] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0039] The term "parallel" in this application includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0040] At present, from the perspective of market development, 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 stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0041] After the battery is assembled, it goes through processes such as filling, sealing, and standing before being tested. Among them, the charging performance test is an indispensable link, which verifies whether the battery's charging efficiency and safety during fast charging are qualified. At present, in the field of battery technology, the charging and discharging tester of the battery testing laboratory is often used to test the fast charging performance of the battery pack, and there are few tests specifically for the fast charging performance of battery cells.

[0042] When the charge and discharge tester used to test the fast charging performance of the battery pack is used for the charging performance test of the battery cell, since the battery cell is the smallest unit of the battery pack, it does not have a battery management system (Battery Management System, BMS). During the test, there is a lack of a battery management system to monitor the status of the battery cell, and thus the charging current cannot be adjusted according to the real-time status of the battery cell. During the test, the charging method for charging the 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. This will cause a large error in the test data and affect the charging performance test results. Experiments have shown that the error between the maximum charging current measured in this way and the actual maximum charging current is as high as 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, increased internal resistance, increased temperature, aging, etc.), causing the charging current to be easily too large or too small, affecting the charging efficiency.

[0043] In view of this, a charging performance test method and instrument, electronic equipment, medium and program are designed, which can collect the temperature value of the battery cell and the sampling value of the target signal, and can obtain the target value of the current from the current query 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, the charging current can be dynamically adjusted according to the changes in the real-time state of the battery cell during the fast charging test, which can improve the accuracy of the charging performance test of the battery cell.

[0044] The test object of the charging performance test method provided in the embodiment of the present application is a battery cell. The battery cell involved in the embodiment 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc.

[0045] The charging performance test method provided in the embodiment of the present application is applied to a charging performance test instrument. Figure 1 A schematic diagram of the structure of a charging performance test instrument provided in some embodiments of the present application, such as Figure 1 As shown, the charging performance test instrument includes: an upper computer 510, a middle computer 520 and a lower computer 530.

[0046] Figure 2 Schematic diagram of a charging performance test method provided in some embodiments of the present application. The present application embodiment provides a charging performance test method for a battery cell, which is used to test the fast charging performance of a battery cell. Please refer to Figure 2 , the charging performance testing method 100 includes S110 to S140.

[0047] S110, in response to the configuration operation of the charging test condition, obtaining 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.

[0048] S120, collecting the temperature value of the battery cell and the sampling value of the target signal; the target signal is related to the electrical signal of the battery cell.

[0049] S130, according to the temperature value and the sampled value of the target signal, determine one of the current query tables from the multiple current query tables included in the preset test information, one of the current query 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 query tables. Among them, "determining the target current value through one of the current query tables" can specifically include: judging whether the temperature value and the sampled value of the target signal are both within the index range of one of the current query tables; in response to the judgment result being no, setting the preset current value to the target current value; in response to the judgment result being yes, determining the target current value through one of the current query tables.

[0050] S140, charge the battery cell and make the charging current the target current value, return to the step of collecting the temperature value of the battery cell and the sampling value of the target signal, and execute in a 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.

[0051] During implementation, the tester can configure the charging test conditions on the host computer 510 so that the host computer 510 receives the configured preset test information and transmits the preset test information to the intermediate computer 520 so that the intermediate computer 520 imports the current query table. In other words, the tester can pre-configure the preset current value and import the current query table on the host computer 510.

[0052] 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. Different charging steps correspond to different charging parameters and conditions. For example, during the charging process, the charging current is first set to 40A and maintained for 10s, and then the charging current is set to 10A and maintained for 20s. In this process, the charging current is 40A and maintained for 10s as one charging step, and the charging current is 10A and maintained for 20s as one charging step.

[0053] The current query table is determined in advance by recording experimental data during the charging test. The current query table is a mapping table of the temperature of the battery cell and the target signal. The current query table is a two-dimensional matrix table. One of the horizontal header and the vertical header of the current query table is the value of the temperature, and the other is the value of the target signal.

[0054] The preset current value is a threshold value indicating a normal charging current, which can be reasonably designed based on experience and actual needs. For example, the preset current value may range from [500A, 650A], and any value among 500A, 550A, 600A, and 650A may be selected. Alternatively, the preset current value may also be the maximum value of the current in the current query table.

[0055] In S120, the lower computer 530 collects the temperature value of the battery cell and the sampled value of the target signal, and transmits them to the middle computer 520. The electrical signal of the battery cell refers to the current and voltage.

[0056] In S130, the intermediate computer 520 receives the preset test information sent by the upper computer 510, and receives the temperature value and the sampled value of the target signal sent by the lower computer 530, determines the corresponding charging step according to the current state of the battery cell (i.e., the temperature value and the sampled value of the target signal), and then determines one of the current query tables corresponding to the charging step from multiple current query tables, and then performs a table lookup to determine the target current value and transmits it to the lower computer 530. The specific implementation process of the intermediate computer 520 determining whether the temperature value and the sampled 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 sampled 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, the preset current value is set to 600A, and the temperature-SOC matrix table is as follows: Figure 3 If the collected temperature value is 60℃, the SOC sampling value is 85%, 60℃ is not within [-25℃, 55℃], and 85% is within [0%, 100%], the judgment result is no, and the target current value is set to 600A.

[0057] 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 is dynamically adjusted during the test. The specific process of determining the target current value by looking up the table will be described in detail below.

[0058] Using the charging performance test method of this embodiment, during the test of the fast charging performance of the battery cell, the following process is cycled: 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 the pre-configured multiple current query tables, and then the target current value is determined by table lookup, and the charging current is adjusted to the target current value. In this way, the charging current can be adjusted according to the real-time state of the battery cell during the fast charging test, so that the charging current changes dynamically, and 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 fast charging test data, and then the accuracy of the charging performance test of the battery cell can be improved. Moreover, thanks to the fact that the current query table is determined in advance, the target current value is determined by table lookup, which reduces the amount of calculation and improves the test efficiency of the charging performance test.

[0059] Moreover, in this embodiment, when at least one of the temperature value of the battery cell and the sampled value of the target signal exceeds the index range of the current query table, the target current value is set to a preset current value, thereby improving the operational stability of the charging performance test method. Using the charging performance test method of this embodiment, during the test of the fast charging performance of the battery cell, if at least one of the collected temperature value of the battery cell and the sampled value of the target signal exceeds the index range of the current query table, the target current value is no longer queried through one of the current query tables as the charging current, but charging is performed according to the preset current value of the charging current, which can make the charging current more reasonable and reduce the risks caused by unreasonable charging current (for example, excessive charging current leads to thermal runaway during the test). Moreover, the charging current is set to a preset safety value, which can ensure safe charging during the charging performance test.

[0060] The battery cells tested by the charging performance test method of this embodiment are used to form a power system for energy storage devices, electric vehicles and other electrical equipment. Since the charging performance test of the battery cells is highly accurate, it can have a positive effect on the accuracy of the fast charging capability prediction of the power system.

[0061] In the charging performance test method disclosed in this article, the target signal related to the electrical signal (i.e., current and voltage signal) 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 can be released by the battery cell to the actual capacity (Practical Capacity), which also indicates the remaining power of the battery cell. The state of charge is affected by voltage and current; 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.

[0062] According to some embodiments of the present application, the target signal may include at least one of a state of charge signal and a power signal.

[0063] In some embodiments, the target signal may include a state of charge signal, and the preset test information may 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.

[0064] 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, see Figure 3 , Figure 3 The unit of temperature is ℃ (Celsius) and the unit of SOC is %.

[0065] Using the charging performance test method of this embodiment, during the test of the fast charging performance of the battery cell, the temperature value and SOC of the battery cell are collected, and according to the temperature value and SOC, one of the current lookup tables matching 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 table lookup. In this way, the charging current can be adjusted according to the real-time state of the SOC, so that the appropriate charging current can be set at different SOC stages, which is conducive to reducing the risk of overcharging.

[0066] In the technical solution where the target signal includes a 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. The preset temperature may range from 50°C to 60°C, and may specifically be any value of 50°C, 55°C, or 60°C. The preset value may range from 90% to 100%, and may specifically be any value of 90%, 95%, or 100%.

[0067] In some embodiments, the target signal may include a power signal, and the preset test information may specifically include a power temperature matrix table, which includes a plurality of current query tables corresponding to a plurality of charging steps. One of the horizontal table header and the vertical table header of the power temperature matrix table is a temperature value, and the other is a power value.

[0068] Using the charging performance test method of this embodiment, during the test of the fast charging performance of the battery cell, by collecting the temperature value and power sampling value of the battery cell, according to the temperature value and power sampling value, one of the current query tables matching 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 table lookup. In this way, the charging current can be adjusted according to the real-time power state, which is conducive to maximizing the power utilization rate during the fast charging test and improving the efficiency of the fast charging test.

[0069] According to some embodiments of the present application, the target signal may include 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. 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.

[0070] S210, according to the temperature value and the sampling value of the state of charge signal, determine a first target current query table from multiple current query tables, the multiple current query tables belong to the temperature-SOC matrix table, the first target current query table matches the charging step of the current state of the battery cell, and the first current value is determined by the first target current query table.

[0071] S220, determining a second target current query table from a plurality of current query tables according to the temperature value and the sampling value of the power signal, the plurality of current query tables belonging to the power-temperature matrix table, the second target current query table matches the charging step of the current state of the battery cell, and determining the second current value through the second target current query table.

[0072] S230: Determine the smaller one of the first current value and the second current value as the target current value.

[0073] The execution order of S210 and S220 is not limited. For example, S210 and S220 can be executed simultaneously, or S210 and S220 can be executed in sequence.

[0074] In S230, when the first current value is lower than the second current value, the first current value is set to the target current value. When the first current value is higher than the second current value, the second current value is set to the target current value. When the first current value is equal to the second current value, the target current value is equal to the first current value and the second current value.

[0075] Using the charging performance test method of this embodiment, during the test of the fast charging performance of the battery cell, the current value is searched by combining the temperature-SOC matrix table and the power-temperature matrix table, and a current value found is selected as the charging current. Compared with the technical solution of determining the charging current by querying the power-temperature matrix table separately according to the temperature value and power, and compared with the technical solution of determining the charging current by querying the temperature-SOC matrix table separately according to the temperature value and SOC, the process of determining the charging current in this embodiment more comprehensively considers the state of the battery cell, and thus can determine a more accurate charging current.

[0076] 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, this embodiment determines the smaller one of the first current value and the second current value as the target current value, so that the charging current will not exceed the safe charging range during the charging performance test. In this way, the accuracy of the charging performance test can be improved, and the safety of the charging performance test can also be improved.

[0077] According to some embodiments of the present application, the target signal may be a voltage signal, and the preset test information may specifically include a voltage temperature table, which includes multiple current query tables corresponding to multiple charging steps. That is, in S120, the lower computer 530 collects the temperature value of the battery cell and the sampled value of the voltage signal. In this embodiment, the specific implementation process of the above S130 may be S131.

[0078] S131, according to the sampling value of the temperature value and the voltage signal, determine a third target current query table from multiple current query tables, the multiple current query tables belong to the voltage-temperature table, the third target current query table matches the charging step of the current state of the battery cell, and the target current value is determined through the third target current query table.

[0079] One of the horizontal and vertical headers of the voltage-temperature table is the numerical value of temperature, and the other is the numerical value of voltage.

[0080] Using the charging performance test method of this embodiment, during the test of the fast charging performance of the battery cell, by collecting the temperature value and the sampling value of the voltage signal of the battery cell, according to the sampling value of the temperature value and the voltage signal, one of the current query tables matching the charging step of the current state of the battery cell is determined from the voltage temperature table, and then the target current value is determined by table lookup. 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, looking up the charging current through the voltage temperature table can quickly respond to the charging state of the battery cell.

[0081] According to some embodiments of the present application, the sampled value of the voltage signal may specifically include a current voltage value and at least one historical voltage value. In the above S131, "according to the temperature value and the sampled value of the voltage signal, determine one of the current query tables that matches the charging step of the current state of the battery cell from multiple current query tables belonging to the voltage-temperature table" may specifically include S310 to S330.

[0082] S310: Compare the current voltage value with a maximum historical voltage value among at least one historical voltage value.

[0083] S320 , in response to the comparison result being that the current voltage value is less than the maximum historical voltage value, determining a third target current lookup table from a plurality of current lookup tables according to the temperature value and the maximum historical voltage value.

[0084] S330 , in response to the comparison result being that the current voltage value is greater than or equal to the maximum historical voltage value, determining a third target current lookup table from a plurality of current lookup tables according to the temperature value and the current voltage value.

[0085] During implementation, after the temperature value and the sampling value of the voltage signal are collected for the first time, the target current value is directly searched through the voltage temperature table according to the sampling value of the temperature value and the voltage signal collected for the first time in S131. From the second time when the temperature value and the sampling value of the voltage signal are collected, S310 to S330 are executed to compare the newly collected current voltage value with the maximum historical voltage value among the previously collected historical voltage values, and the target current value is searched through the voltage temperature table according to the current voltage value and the maximum one among all the historical voltage values.

[0086] Voltage-temperature tables can be found, for example, in Figure 4 , Figure 4 The unit of voltage is V (volt). If the collected temperature value is 10℃, the current voltage value is 3V, and the historical voltage values ​​collected before are 2.5V, 2.8V, 3.5V, and 4V, then according to 10℃ and 4V, Figure 4 The target current value is I 9H '.

[0087] When the charging performance test method of this embodiment is used to test the fast charging performance of a battery cell, the current voltage value and the maximum voltage of all historical voltage values ​​are used as the basis for looking up the charging current through the voltage-temperature table.

[0088] It is understandable that in the technical solution of determining the target current value from the voltage-temperature table by the current voltage value, the target current value found may vary greatly, and the charging current will jump significantly during the charging performance test, resulting in significant voltage fluctuations during the charging performance test. For example, the charging current suddenly changes from large to small, and the voltage suddenly drops; then, the charging current suddenly changes from small to large, and the voltage suddenly increases.

[0089] In this embodiment, the table is looked up by using the current voltage value and the maximum voltage of all historical voltage values ​​as the input of the sampling value of the voltage signal, so that the possibility of the target current value found changing suddenly between small values ​​and large values ​​is low. This can improve the stability of the charging current during the charging performance test, which is beneficial to reduce the voltage fluctuation during the charging performance test.

[0090] 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 battery cell reaches a preset temperature; the sampling value of the voltage signal reaches a preset charging cut-off voltage of the battery cell.

[0091] 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: an interpolation table lookup method and an interval table lookup method.

[0092] The specific implementation of the above S430 may be: for a temperature value and / or a sample value of a target signal that is not included in one of the current lookup tables, the target current value is determined by a preset table lookup method.

[0093] That is to say, the tester can pre-configure the preset table lookup method on the host computer 510. When the temperature value and the sampled value of the target signal are both within the index range of one of the current lookup tables, the judgment result of S410 is yes. Further, if the temperature value is data in the temperature data set corresponding to one of the current lookup tables, and the sampled value of the target signal is data in the target signal data set corresponding to one of the current lookup tables, that is, for the temperature value and the sampled value of the target signal contained in one of the current lookup tables, the target current value can be directly found from one of the current lookup tables.

[0094] in Figure 3 The temperature data set corresponding to the temperature-SOC matrix table shown 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%). For example, if the collected temperature value is 20°C and the SOC sampling value is 30%, then Figure 3 The target current value is I 3J .

[0095] Furthermore, if the temperature value is not the data in the temperature data set corresponding to one of the current query tables, and / or the sampling value of the target signal is not the data in the target signal data set corresponding to one of the current query tables, that is, for the temperature value and / or the sampling value of the target signal not included in one of the current query tables, the target current value can be determined by a preset table lookup method.

[0096] For example, if the collected temperature value is 8°C and the SOC sampling value is 15%, the target current value is calculated by interpolation table lookup, or the target current value is determined by interval table lookup. Taking the interval table lookup method to determine the target current value as an example, the temperature value interval is [5°C, 10°C], the SOC interval is [10%, 20%], and the corresponding current to be looked up is I 1G ,I 1H ,I 2G ,I 2H , I 1G ,I 1H ,I 2G ,I 2H The maximum value in the range is used as the target current value, or I 1G ,I 1H ,I 2G ,I 2H The minimum value is taken as the target current value.

[0097] 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 lookup tables, the target current value is calculated by interpolation table lookup or interval table lookup based on the known data in the current lookup table. In this way, the target current value can be obtained by combining table lookup and simple calculation. On the one hand, compared with the technical solution of direct table lookup, the error of the target current value obtained in this way is smaller, which is conducive to making the test results of the charging performance test more accurate. On the other hand, the amount of calculation is small, which is conducive to improving the test efficiency of the charging performance test.

[0098] According to some embodiments of the present application, the preset test information may further include at least one interpolation lookup table corresponding to each current lookup table in the plurality of current lookup tables.

[0099] The specific implementation of S430 may be: for a temperature value and / or a sampled value of a target signal not included in one of the current lookup tables, a target current value is obtained from an interpolation lookup table corresponding to one of the current lookup tables.

[0100] The interpolation query table is obtained by precalculating possible interpolation results based on the current query table to which it belongs. The tester can pre-configure the interpolation query table on the host computer 510. The interpolation query table is similar to the current query table to which it belongs, and one of its horizontal header and vertical header is the value of the temperature and the other is the value of the target signal.

[0101] When the temperature value and the sampled value of the target signal are both within the index range of one of the current lookup tables, that is, the judgment result of S410 is yes. Further, if the temperature value is not data in the temperature data set corresponding to one of the current lookup tables, and / or the sampled value of the target signal is not data in the target signal data set corresponding to one of the current lookup tables, that is, for the temperature value and / or the sampled value of the target signal not included in one of the current lookup tables, the target current value can be found from the interpolation lookup table.

[0102] 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 query tables, the target current value is obtained by querying from an interpolation query table under one of the current query tables. In this method, only the interpolation query table needs to be relied on for search and matching, which further reduces the amount of calculation and can also reduce the slight error caused by the calculation, so that the operating efficiency of the charging performance test method is further improved, thereby improving the efficiency of the charging performance test.

[0103] 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 sampling value of the target signal" in S130 may be: according to the temperature values ​​of multiple sampling points and the sampling value of the target signal.

[0104] The lower computer 530 may include an inspection board, on which a plurality of temperature sensor interfaces are provided, and the plurality of temperature sensor interfaces are connected one-to-one with a plurality of temperature sensors 532 , each temperature sensor 532 being used to detect the temperature of a sampling point. Alternatively, the lower computer 530 may include a plurality of temperature sensors 532 .

[0105] In S120, the lower computer 530 may collect temperature values ​​of multiple sampling points on the battery cell. The number of sampling points is greater than or equal to 2, and specifically any value of 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 accordingly, 8 temperature values ​​are collected.

[0106] By collecting temperature values ​​of multiple sampling points, this embodiment can take a certain temperature value from the temperature values ​​of multiple sampling points for table lookup according to needs, thereby facilitating optimization of the charging performance test process according to different needs.

[0107] In some embodiments, S130 can look up a table according to any temperature value, maximum temperature value, minimum temperature value or intermediate value of the temperature values ​​of multiple sampling points. In other embodiments, S130 can look up a table according to the average temperature value of the temperature values ​​of multiple sampling points. In contrast, in the technical solution of looking up a table according to the average temperature value of the temperature values ​​of multiple sampling points, the average temperature value can more accurately reflect the overall temperature level of the battery cell, can reduce the interference of temperature anomalies of certain sampling points on the determined target current value, and improve the accuracy of fast charging test data.

[0108] According to some embodiments of the present application, the above S130 is repeatedly executed every first preset time period. The first preset time period is T1, and the value range of T1 can be designed to be 800ms (milliseconds) ≤ T1 ≤ 2s (seconds).

[0109] During implementation, the tester may pre-set T1 on the host computer 510. T1 may be any value of 800ms, 1s, 1200ms, 1500ms, or 2s.

[0110] In this embodiment, by making 800ms≤T1≤2s, on the one hand, thanks to T1≤2s, the interval time length of outputting the target current value by looking up the table according to the temperature value and the sampled value of the target signal will not be too long, so the dynamic change frequency of the charging current during the charging performance test is relatively fast, so as to be able to reliably and quickly respond to the charging state of the battery cell. On the other hand, thanks to 800ms≤T1, the interval time length of outputting the target current value by looking up the table according to the temperature value and the sampled value of the target signal will not be too short, so the change frequency of the charging current during the charging performance test will not be too fast, reducing the possibility that the electrode reaction rate cannot be adjusted in time due to a sudden change in the charging current, so as to reduce battery polarization.

[0111] Figure 5 Schematic diagram of comparison between the charging curves in some embodiments of the present application and the charging curves of constant current charging. Figure 5 It can be understood that in some related technologies, during the process of charging performance test of battery cells, the charging method of the battery cells is constant current charging, and the charging curve is Figure 5 The dashed line shows that the charging current at point A and point B suddenly changes. In the charging performance test method of this embodiment, the charging current is adjusted every first preset time, and 800ms (milliseconds) ≤ T1 ≤ 2s (seconds), the intermediate computer 520 outputs the target current value more intensively, and the charging curve is Figure 5 It is shown by the solid line in the figure, and it can be seen that the charging current changes smoothly during the charging performance test.

[0112] According to some embodiments of the present application, the step of collecting the temperature value of the battery cell in the above S120 is repeated every second preset time, and the step of collecting the sample value of the target signal in the above S120 is repeated every third preset time. The second preset time is T2, and the third preset time is T3. T1, T2 and T3 can be designed to satisfy: T1>T2, T1>T3.

[0113] During implementation, the tester can pre-set T1, T2 and T3 on the host computer 510. T2 and T3 can be equal or different. In some implementations, T2>T3. The value range of T2 can be 450ms (milliseconds) ≤ T1 ≤ 550ms, and the value range of T3 can be 8ms ≤ T2 ≤ 12ms. Among them, T2 can be any value of 450ms, 500ms, 550ms, and T3 can be any value of 8ms, 9ms, 10ms, 11ms, 12ms. In this embodiment, the dynamic change frequency of the charging current is moderate during the charging performance test, and the possibility of battery polarization is reduced. By making the second preset time length and the third preset time length both shorter than the first preset time length, the temperature value of the battery cell and the sampling value of the target signal can be monitored at a high frequency, so as to improve the real-time monitoring of the temperature and target signal, and further facilitate the accuracy of the target current value determined accordingly, which has a positive effect on improving the accuracy of the charging performance test.

[0114] Based on the same technical concept, the present application embodiment provides a charging performance test instrument, such as Figure 1 As shown, it includes: an upper computer 510, a middle computer 520 and a lower computer 530. The middle computer 520 is in communication connection with both the upper computer 510 and the lower computer 530, and the lower computer 530 is used to connect with the battery monomer.

[0115] The upper computer 510 is configured to obtain the configured preset test information in response to the configuration operation of the charging test conditions, and send the preset test information to the intermediate computer 520; the preset test information includes a preset current value and multiple current query tables corresponding to multiple charging steps.

[0116] The lower computer 530 is configured to collect the temperature value of the battery cell and the sampled value of the target signal, and send the temperature value and the sampled value of the target signal to the middle computer 520; the target signal is related to the electrical signal of the battery cell.

[0117] The intermediate computer 520 is configured to receive the preset test information sent by the upper computer 510, receive the temperature value and the sampling value sent by the lower computer 530, determine 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 sampling value of the target signal, determine the target current value through one of the current query tables, and transmit the target current value to the lower computer 530. "Determine the target current value through one of the current query tables" can specifically include: 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; in response to the judgment result being no, setting the preset current value to the target current value; in response to the judgment result being yes, determining the target current value through one of the current query tables.

[0118] The lower computer 530 is further configured to receive the target current value sent by the middle computer 520, charge the battery cell and make the charging current the target current value, and return to the lower computer 530 to collect the temperature value of the battery cell and the sampling value of the target signal to execute the step cyclically.

[0119] The host computer 510 refers to a machine that can directly issue a control command, and specifically can be at least one of a server, a laptop, 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 (Battery Test System, BTS), and 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. The 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, and the tester configures the touch button of the display interface so that the host computer 510 receives the configured preset test information.

[0120] The intermediate computer 520 can communicate with the upper computer 510 and the lower computer 530 by using CAN (Controller Area Network) communication, Modbus protocol, Ethernet / IP protocol, etc.

[0121] The lower computer 530 may specifically 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 also include a charger 531. The charger 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.

[0122] In some embodiments, the median machine 520 may be configured to: According to the temperature value and the sampled value of the state of charge signal, a first target current query table is determined from multiple current query tables, the multiple current query tables belong to the temperature-SOC matrix table, the first target current query matches the charging step table of the current state of the battery cell, and the first current value is determined by the first target current query table; According to the temperature value and the sampling value of the power signal, a second target current query table is determined from a plurality of current query tables, the plurality of current query tables belong to the power-temperature matrix table, the second target current query table matches the charging step of the current state of the battery cell, and the second current value is determined by the second target current query table; The smaller one of the first current value and the second current value is determined as the target current value.

[0123] In some embodiments, the median machine 520 may be configured to: According to the sampling values ​​of the temperature value and the voltage signal, a third target current query table is determined from multiple current query tables, the multiple current query tables belong to the voltage-temperature table, the third target current query table matches the charging step of the current state of the battery cell, and the target current value is determined through the third target current query table.

[0124] In some embodiments, the sampled value of the voltage signal includes a current voltage value and at least one historical voltage value; the intermediate computer 520 may be configured to: Comparing the current voltage value with a maximum historical voltage value among at least one historical voltage value; In response to the comparison result being that the current voltage value is less than the maximum historical voltage value, determining a third target current lookup table from a plurality of current lookup tables according to the temperature value and the maximum historical voltage value; In response to the comparison result being that the current voltage value is greater than or equal to the maximum historical voltage value, a third target current lookup table is determined from a plurality of current lookup tables according to the temperature value and the current voltage value.

[0125] In some embodiments, the preset test information further includes a preset table lookup method, which is any one of the following methods: an interpolation table lookup method and an interval table lookup method; the median machine 520 may be configured to: For a temperature value and / or a sampled value of a target signal that is not included in one of the current lookup tables, a target current value is determined by a preset table lookup method.

[0126] In some embodiments, the intermediate computer 520 can be configured to perform the steps 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, and determining the target current value through one of the current query tables every first preset time. The first preset time is T1, 800ms≤T1≤2s.

[0127] In some embodiments, the lower computer 530 can be configured to perform the step of collecting temperature values ​​every second preset time, and the lower computer 530 can be configured to perform the step of collecting the sampled value of the target signal every third preset time. The second preset time is T2, the third preset time is T3, T1>T2, T1>T3.

[0128] Figure 6 Schematic diagram of an electronic device provided in some embodiments of the present application. The present application embodiment provides an electronic device for charging performance testing, such as Figure 6As 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, which can communicate with each other, such as through a bus 604 or other appropriate connections. The memory 607 stores instructions, and when the instructions are executed by the processor 605, the processor 605 executes the charging performance test method in the above embodiment.

[0129] The processor 605 may be a single processing unit or multiple processing units, all of which 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 operating instructions. Among other capabilities, the processor 605 may be configured to obtain and execute computer-readable instructions stored in the memory 607, mass storage device 606, or other computer-readable media, such as program codes of an operating system 608, program codes of an application program 609, program codes of other programs 610, and the like.

[0130] The memory 607 and the mass storage device 606 are examples of computer-readable storage media for storing instructions that are executed by the processor 605 to implement the various functions described above. For example, the memory 607 may generally include both volatile memory and non-volatile memory (e.g., RAM, ROM, etc.). In addition, the mass storage device 606 may generally include a hard drive, a solid-state drive, a removable medium, including external and removable drives, a memory card, a flash memory, a floppy disk, an optical disk (e.g., a CD, a DVD), a storage array, a network attached storage, a storage area network, etc. The memory 607 and the mass storage device 606 may all be collectively referred to herein as memory or computer-readable storage media, and may be a non-transitory medium capable of storing computer-readable, processor-executable program instructions as computer program code, which may be executed by the processor 605 as a specific machine configured to implement the operations and functions described in the examples herein.

[0131] A plurality of programs may 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 may be loaded into the memory 607 for execution. Examples of such application programs or program modules may 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 an upper computer 510, an intermediate 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 other embodiments described herein.

[0132] Although in Figure 6 600 , but operating system 608 , application programs 609 , other programs 610 , and program data 611 , or portions thereof, may be implemented using any form of computer-readable media accessible by electronic device 600 .

[0133] One or more communication interfaces 602 are used to exchange data with other electronic devices, such as through a network, 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 an external storage device (not shown) such as a storage array, a network attached storage, a storage area network, etc.

[0134] In some examples, a display device 601 such as a monitor may be included for displaying information and images to a user. Other I / O devices 603 may be computing devices that receive various inputs from a user and provide various outputs to the user, and may include a touch input device, a gesture input device, a camera, a keyboard, a remote control, a mouse, a printer, an audio input / output device, and the like.

[0135] The technology described herein can be supported by these various configurations of the electronic device 600, and is not limited to the specific examples of the technology described herein. For example, the function can also be implemented in whole or in part on the "cloud" by using a distributed system. The cloud includes and / or represents a platform for resources. The platform abstracts the underlying functions of the hardware (e.g., server) and software resources of the cloud. Resources may include applications and / or data that can be used when performing computing processing on a server away from the electronic device 600. Resources may also include services provided over the Internet and / or through a subscriber network such as a cellular or Wi-Fi network. The platform can abstract resources and functions to connect the electronic device 600 to other computer devices. Therefore, the implementation of the functions described herein can be distributed throughout the cloud. For example, the functions can be implemented partially on the electronic device 600 and partially through a platform that abstracts the functions of the cloud.

[0136] An embodiment of the present application also provides a computer-readable storage medium having instructions stored thereon. When the instructions are executed individually or collectively by one or more processors of an electronic device, the electronic device executes a method as described in any of the above embodiments.

[0137] Computer-readable storage media include volatile and nonvolatile, removable and non-removable media implemented by any method or technology for storage of 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 technology, CD-ROM, digital versatile disks (DVD), or other optical storage devices, magnetic cassettes, magnetic tapes, magnetic disk storage devices or other magnetic storage devices, or any other non-transmission media that can be used to store information for access by a computer device.

[0138] An embodiment of the present application also provides a computer program product, including instructions, which, when executed individually or collectively by one or more processors of the electronic device 600, enable the electronic device 600 to execute a method as described in any of the above embodiments.

[0139] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0140] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be interpreted as limiting the present application.

[0141] In the implementation mode of the present application, Figure 1As shown, a charging performance test instrument includes: an upper computer 510, a middle computer 520 and a lower computer 530. Among them, the tester can interact with the upper computer 510, the middle computer 520 is connected to the upper computer 510 and the lower computer 530 for communication, and the lower computer 530 is used to connect to the battery monomer.

[0142] Embodiment 1 The tester performs configuration operations 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 600A, a preset table lookup method, a first preset time length T1 of 1s, a second preset time length T2 of 500ms, and a third preset time length T3 of 10ms. Among them, the temperature-SOC matrix table includes multiple current lookup tables corresponding to multiple charging steps, and the power-temperature matrix table also includes multiple current lookup tables corresponding to multiple charging steps.

[0143] The upper computer 510 sends the preset test information to the intermediate computer 520 .

[0144] The lower computer 530 collects the temperature values ​​of 8 sampling points on the battery cell every 500 ms, collects the SOC and power every 10 ms, and sends the collected temperature values, the sampled values ​​of the SOC signal, and the sampled values ​​of the power signal to the middle computer 520 .

[0145] The intermediate computer 520 receives the preset test information and performs the following steps every 1 second: According to the average temperature value of the temperature values ​​of the eight sampling points and the sampled value of the SOC, one of the current lookup tables that matches the charging step of the current state of the battery cell is determined from the multiple current lookup tables belonging to the temperature-SOC matrix table, and the first current value is determined by one of the current lookup tables belonging to the temperature-SOC matrix table; According to the average temperature value of the temperature values ​​of the eight sampling points and the sampling value of the power signal, one of the current lookup tables matching the charging step of the current state of the battery cell is determined from the multiple current lookup tables belonging to the power temperature matrix table, and the second current value is determined by one of the current lookup tables belonging to the power temperature matrix table; The smaller one of the first current value and the second current value is determined as the target current value, and the target current value is transmitted to the lower computer 530 .

[0146] The lower computer 530 adjusts the charging current according to the target current value transmitted by the middle computer 520. Returning to the lower computer 530, the temperature value, SOC and power of the battery cell are collected, and the cycle is executed until the charging cut-off condition is met.

[0147] In the process of determining the first current value from one of the current lookup tables under the temperature-SOC matrix table, it is first determined whether the temperature value and the sampled value of the SOC are both within the index range of one of the current lookup tables under the temperature-SOC matrix table. In response to the judgment result being no, the value of the target current value is set to a preset current value (i.e., 600A). In response to the judgment result being yes, if the temperature value is not data in the temperature data set corresponding to one of the current lookup tables, and / or the sampled value of the SOC is not data in the target signal data set corresponding to one of the current lookup tables, the target current value is determined by a preset table lookup method.

[0148] The charging cut-off condition includes at least one of the following conditions: the temperature of the battery cell reaches a preset temperature; the sampling value of the state of charge signal reaches 100%. The preset temperature is 50°C or 60°C.

[0149] Embodiment 2 Similar to the first embodiment, the difference is that the preset test information in the second embodiment includes a voltage-temperature matrix table, a preset current value of 600A, a preset table lookup method, a first preset time length T1 of 1s, a second preset time length T2 of 500ms, and a third preset time length T3 of 10ms. Among them, the voltage-temperature matrix table includes multiple current lookup tables corresponding to multiple charging steps.

[0150] The lower computer 530 collects temperature values ​​of eight sampling points on the battery cell every 500 ms, collects voltage every 10 ms, and sends the collected temperature values ​​and sampling values ​​of the voltage signal to the middle computer 520 .

[0151] The steps performed by the intermediate computer 520 every 1 second include: Calculate the average temperature value based on the temperature values ​​of 8 sampling points; Comparing the current voltage value with a maximum historical voltage value among at least one historical voltage value; According to the maximum value among the average temperature value, the current voltage value and the maximum historical voltage value, one current lookup table matching the charging step of the current state of the battery cell is determined from multiple current lookup tables, and the second current value is determined through one of the current lookup tables.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for testing the charging performance of a battery cell, characterized in that: include: In response to a configuration operation on a charging test condition, obtaining 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; Collect the temperature value of the battery cell and the sampling value of the target signal; The target signal is related to the electrical signal of the battery cell; According to the temperature value and the sampled value of the target signal, one of the current query tables is determined from the multiple current query tables included in the preset test information, the one of the current query tables matches the charging step corresponding to the current state of the battery cell, and the target current value is determined through the one of the current query tables; the determining the target current value through the one of the current query tables comprises: judging whether the temperature value and the sampled value of the target signal are both within the index range of the one of the current query tables, in response to a negative judgment result, setting the preset current value to the target current value, and in response to a positive judgment result, determining the target current value through the one of the current query tables; The battery cell is charged and the charging current is made to be the target current value, and the step of collecting the temperature value of the battery cell and the sampling value of the target signal is returned to and executed in a loop until a charging cut-off condition is reached.

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 multiple 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 multiple current query tables.

3. The charging performance test 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 step of determining one current query table from the multiple current query tables included in the preset test information according to the temperature value and the sampled value of the target signal, wherein the one current query table matches 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: Determine a first target current query table from the multiple current query tables according to the temperature value and the sampled value of the state of charge signal, the multiple current query tables belong to the temperature-SOC matrix table, the first target current query table matches the charging step of the current state of the battery cell, and determine the first current value through the first target current query table; 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, the second target current query table matches the charging step of the current state of the battery cell, and the second current value is determined by the second target current query table; A smaller one of the first current value and the second current value is determined as the target current value.

4. The charging performance testing method according to claim 1, characterized in that: 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 query tables; The step of determining one current query table from the multiple current query tables included in the preset test information according to the temperature value and the sampled value of the target signal, wherein the one current query table matches 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 voltage signal, a third target current query table is determined from the multiple current query tables, the multiple current query tables belong to the voltage-temperature table, and the third target current query table matches the charging step of the current state of the battery cell; the target current value is determined by the third target current query table.

5. The charging performance test method according to claim 4, characterized in that: The sampled value of the voltage signal includes a current voltage value and at least one historical voltage value; Determining a third target current query table from the plurality of current query tables according to the temperature value and the sampled value of the voltage signal comprises: comparing the current voltage value with a maximum historical voltage value among the at least one historical voltage value; In response to the comparison result being that the current voltage value is less than the maximum historical voltage value, determining the third target current lookup table from the plurality of current lookup tables according to the temperature value and the maximum historical voltage value; In response to the comparison result being that the current voltage value is greater than or equal to the maximum historical voltage value, the third target current lookup table is determined from the plurality of current lookup tables according to the temperature value and the current voltage value.

6. The charging performance test method according to claim 1, characterized in that: The preset test information also includes a preset table lookup method, and the preset table lookup method is any one of the following methods: an interpolation table lookup method and an interval table lookup method; The determining the target current value by using one of the current query tables comprises: For the temperature value and / or the sampled value of the target signal not included in one of the current lookup tables, the target current value is determined by the preset table 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 plurality of current lookup tables; and determining the target current value by using one of the current lookup tables includes: For the temperature value and / or the sampled value of the target signal not included in one of the current lookup tables, the target current value is acquired from the interpolation lookup table corresponding to one of the current lookup tables.

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

9. The charging performance testing method according to any one of claims 1 to 8, characterized in that: The step of determining the target current value by using one of the current query tables is repeated every first preset time period; The first preset time length is T1, 800ms≤T1≤2s.

10. The charging performance test method according to claim 9, characterized in that: The step of collecting the temperature value is repeated every second preset time period; the step of collecting the sampling value of the target signal is repeated every third preset time period; the second preset time period is T2, the third preset time period is T3, T1>T2, T1>T3.

11. A charging performance test instrument, characterized in that: include: An upper computer, a middle computer and a lower computer, wherein the middle computer is communicatively connected with the upper computer and the lower computer, and the lower computer is used to connect with a battery cell; The upper computer is configured to, in response to a configuration operation of a charging test condition, obtain configured preset test information and send the preset test information to the intermediate computer; the preset test information includes a preset current value and a plurality of current query tables corresponding to a plurality of charging steps; The lower computer is configured to collect the temperature value of the battery cell and the sampled value of the target signal, 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 intermediate computer is configured to receive the preset test information sent by the upper 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 multiple 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 transmit the target current value to the lower computer; the determining the target current value through one of the current query tables includes: judging 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, in response to a judgment result of no, setting the preset current value to the target current value, and in response to a judgment result of yes, determining the target current value through one of the current query tables; 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, return to the step in which the lower computer collects the temperature value of the battery cell and the sampling value of the target signal, and execute the step in a loop until the charging cut-off condition is reached.

12. An electronic device for charging performance testing, characterized in that: include: at least one processor; as well as At least one memory is communicatively connected to the at least one processor, and the at least one memory stores instructions, and when the instructions are executed by the at least one processor individually or collectively, the electronic device executes the charging performance test method according to any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that: Instructions are stored, and when the instructions are executed individually or collectively by one or more processors of the electronic device, the electronic device executes the charging performance test method according to any one of claims 1 to 10.

14. A computer program product, characterized in that The method comprises instructions, which, when executed individually or collectively by one or more processors of an electronic device, enable the electronic device to execute the charging performance testing method according to any one of claims 1 to 10.

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