A method, system, device and medium for testing the DCIR of an electric cell

Abstract

The present invention provides a method, system, device and medium for testing the DCI R of a battery cell in the technical field of battery cell DCI R testing. The method includes the following steps: Step S10, the host computer configures the DCI R test process steps and sends the DCI R test process steps to the middle computer; Step S20, the middle computer analyzes the received DCI R test process steps, obtains the test parameters and sends them to the lower computer; Step S30, the lower computer automatically controls the charging and discharging of the battery cell and the process step switching based on the received test parameters; Step S40, the middle computer collects the charging and discharging data from the lower computer based on the DCI R test process steps, and calculates the DCI R value based on the charging and discharging data. The advantages of the present invention are: greatly improving the DCI R test accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of cell DCIR testing, and particularly to a cell DCIR testing method, system, device and medium. Background Art

[0002] After the production of a cell, a series of tests need to be carried out on the cell to ensure the performance and safety of the cell, including DCIR (Direct Current Internal Resistance) testing, that is, direct current internal resistance testing. In a three-layer cell testing system including a host computer, a middle computer and a lower computer, the lower computer performs charge and discharge according to the test parameters sent by the middle computer, the middle computer collects the charge and discharge data of the cell from the lower computer, and the middle computer makes a decision judgment according to the charge and discharge data and the preset cut-off conditions to determine whether the lower computer jumps to the next working step, that is, the switching of the working steps is controlled by the middle computer.

[0003] During the DCIR testing process, the switching of the working steps is controlled by the middle computer, and there is a time difference between the middle computer sending the switching instruction and the lower computer successfully executing the switching, which affects the accuracy of the DCIR testing.

[0004] Therefore, how to provide a cell DCIR testing method, system, device and medium to improve the accuracy of DCIR testing has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a cell DCIR testing method, system, device and medium to improve the accuracy of DCIR testing.

[0006] In the first aspect, the present invention provides a cell DCIR testing method, including the following steps:

[0007] Step S10: The host computer configures the DCIR testing working steps and sends the DCIR testing working steps to the middle computer;

[0008] Step S20: The middle computer analyzes the received DCIR testing working steps, obtains the test parameters and sends them to the lower computer;

[0009] Step S30: The lower computer automatically controls the charge and discharge of the cell and the switching of the working steps based on the received test parameters;

[0010] Step S40: The middle computer collects the charge and discharge data from the lower computer based on the DCIR testing working steps, and calculates the DCIR value based on the charge and discharge data.

[0011] Further, in the step S10, the DCIR test step includes a first step and a second step; the second step is executed after the first step is completed;

[0012] The first step is specifically: controlling the battery cell to charge and discharge with a current I 1 for a duration of T r1 and sampling at the duration of T c1 ; the T r1 is greater than T c1 ;

[0013] The second step is specifically: controlling the battery cell to charge and discharge with a current I 2 for a duration of T r2 and sampling at the duration of T c2 ; the T r2 is greater than T c2 .

[0014] Further, in the step S20, the test parameters include I 1 , T r1 , I 2 , T r2 and the corresponding steps.

[0015] Further, the step S40 is specifically:

[0016] The middle computer collects the charge and discharge data including voltage V c1 and current I c1 from the lower computer at the duration of T c1 , and collects the charge and discharge data including voltage V c2 and current I c2 from the lower computer at the duration of T c2 , and calculates the DCIR value based on the charge and discharge data:

[0017] DCIR = (V c1 - V c2 ) / (I c1 - I c2 ).

[0018] In a second aspect, the present invention provides a battery cell DCIR test system, including the following modules:

[0019] A DCIR test step configuration module, configured to configure the DCIR test step by the upper computer and send the DCIR test step to the middle computer;

[0020] A test parameter distribution module, configured to analyze the received DCIR test step by the middle computer, obtain the test parameters and send them to the lower computer;

[0021] The working step execution module is used for the lower computer to automatically control the charging and discharging of the battery cell and the switching of working steps based on the received test parameters;

[0022] The DCIR value calculation module is used for the middle computer to collect the charging and discharging data from the lower computer based on the DCIR test working step and calculate the DCIR value based on the charging and discharging data.

[0023] Further, in the DCIR test working step configuration module, the DCIR test working step includes a first working step and a second working step; the second working step is executed after the first working step is completed;

[0024] The specific first working step is: controlling the battery cell to charge and discharge for a duration of T with a current of I 1 and sampling at the time of the duration of T r1 ; the T c1 is greater than T r1 ; c1 ;

[0025] The specific second working step is: controlling the battery cell to charge and discharge for a duration of T with a current of I 2 and sampling at the time of the duration of T r2 ; the T c2 is greater than T r2 ; c2

[0026] Further, in the test parameter distribution module, the test parameters include I 1 , T r1 , I 2 , T r2 and the corresponding working steps.

[0027] Further, the DCIR value calculation module is specifically:

[0028] The middle computer collects the charging and discharging data including voltage V c1 and current I c1 from the lower computer at the time of the duration of T based on the DCIR test working step, and collects the charging and discharging data including voltage V c1 and current I c2 from the lower computer at the time of the duration of T, and calculates the DCIR value based on the charging and discharging data: c2 c2 DCIR = (V

[0029] - V c1 ) / (I c2 - I c1 ) c2 ).

[0030] In a third aspect, the present invention provides a cell DCIR testing device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method described in the first aspect is implemented.

[0031] In a fourth aspect, the present invention provides a cell DCIR testing medium, on which a computer program is stored. When the program is executed by a processor, the method described in the first aspect is implemented.

[0032] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0033] The upper computer sends the configured DCIR test steps to the middle computer. The middle computer analyzes the DCIR test steps to obtain test parameters and sends them to the lower computer. The lower computer automatically controls the charging and discharging of the cell and the step switching based on the received test parameters. The middle computer then collects the charging and discharging data from the lower computer based on the DCIR test steps and calculates the DCIR value. That is, the step switching control is transferred from the middle computer to the lower computer. After the lower computer finishes executing the first step, it automatically executes the second step, reducing the step switching error, and thus greatly improving the DCIR test accuracy.

[0034] The above description is only an overview of the technical solutions of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings in conjunction with embodiments.

[0036] Figure 1 is a flowchart of a cell DCIR testing method of the present invention.

[0037] Figure 2 is a schematic structural diagram of a cell DCIR testing system of the present invention.

[0038] Figure 3 is a schematic structural diagram of a cell DCIR testing device of the present invention.

[0039] Figure 4 is a schematic structural diagram of a cell DCIR testing medium of the present invention.

[0040] Figure 5 is a hardware architecture diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] Embodiments of the present application provide a method, system, device, and medium for testing the DCIR of a battery cell, achieving an improvement in the accuracy of DCIR testing.

[0042] The technical solution in the embodiments of the present application has the following general idea: transfer the control of process step switching from the middle-level machine to the lower-level machine. After the lower-level machine finishes executing the first process step, it automatically executes the second process step, reducing the process step switching error to improve the accuracy of DCIR testing.

[0043] Embodiment 1

[0044] This embodiment provides a method for testing the DCIR of a battery cell, as Figure 1 、 5 shown, including the following steps:

[0045] Step S10: The upper-level machine configures the DCIR test process steps and sends the DCIR test process steps to the middle-level machine through a switch;

[0046] Step S20: The middle-level machine analyzes the received DCIR test process steps, obtains the test parameters, and sends them to the lower-level machine through a switch;

[0047] Step S30: The lower-level machine automatically controls the charging and discharging of the battery cell and process step switching based on the received test parameters;

[0048] That is, the lower-level machine first controls the charging and discharging of the battery cell with a current I 1 for a duration of T r1 and then automatically controls the charging and discharging of the battery cell with a current I 2 for a duration of T r2 without waiting for the middle-level machine to send a switching instruction to reduce the process step switching error;

[0049] Step S40: The middle-level machine collects the charging and discharging data from the lower-level machine based on the DCIR test process steps, calculates the DCIR value based on the charging and discharging data, binds the DCIR value to the current time, performs a hash calculation on the DCIR value and the current time to obtain a hash value, encrypts the DCIR value, the current time, and the hash value using the public key pre-sent by the upper-level machine to obtain encrypted data, and sends the encrypted data to the upper-level machine for archiving. By binding the DCIR value to the current time, effective traceability can be achieved. Performing a hash calculation on the DCIR value and the current time can effectively verify whether the DCIR value has been tampered with. Encrypting the DCIR value, the current time, and the hash value using the public key ensures the security of data transmission.

[0050] In the step S10, the DCIR test process steps include a first process step and a second process step; the second process step is executed after the first process step is completed;

[0051] The specific first working step is as follows: using a current I 1 to control the charging and discharging of the battery cell for a duration of T r1 , and sampling at the time of T c1 ; the T r1 is greater than T c1 .

[0052] The specific second working step is as follows: using a current I 2 to control the charging and discharging of the battery cell for a duration of T r2 , and sampling at the time of T c2 ; the T r2 is greater than T c2 .

[0053] In the step S20, the test parameters include I 1 , T r1 , I 2 , T r2 and the corresponding working steps.

[0054] The specific step S40 is as follows:

[0055] The middle computer collects the charge and discharge data including the voltage V c1 and the current I c1 from the lower computer at the time of T c1 , and collects the charge and discharge data including the voltage V c2 and the current I c2 from the lower computer at the time of T c2 , and calculates the DCIR value based on the charge and discharge data:

[0056] DCIR = (V c1 - V c2 ) / (I c1 - I c2 ).

[0057] Embodiment 2

[0058] This embodiment provides a battery cell DCIR test system, as shown in Figure 2 , 5 , including the following modules:

[0059] A DCIR test working step configuration module, configured to configure the DCIR test working steps by the upper computer and send the DCIR test working steps to the middle computer through a switch;

[0060] A test parameter distribution module, configured to parse the received DCIR test working steps by the middle computer, obtain the test parameters and send them to the lower computer through a switch;

[0061] The working step execution module is used for the lower computer to automatically control the charging and discharging of the battery cell and the switching of working steps based on the received test parameters;

[0062] That is, the lower computer first controls the battery cell to charge and discharge for a duration of T with a current I 1 and then automatically controls the battery cell to charge and discharge for a duration of T with a current I r1 without waiting for the middle computer to send a switching instruction, so as to reduce the working step switching error; 2 and then automatically controls the battery cell to charge and discharge for a duration of T with a current I r2 without waiting for the middle computer to send a switching instruction, so as to reduce the working step switching error;

[0063] The DCIR value calculation module is used for the middle computer to collect charge and discharge data from the lower computer based on the DCIR test working steps, calculate the DCIR value based on the charge and discharge data, bind the DCIR value with the current time, perform a hash calculation on the DCIR value and the current time to obtain a hash value, encrypt the DCIR value, the current time, and the hash value using the public key pre-sent by the upper computer to obtain encrypted data, and send the encrypted data to the upper computer for archiving. By binding the DCIR value with the current time, effective traceability can be achieved. Performing a hash calculation on the DCIR value and the current time can effectively verify whether the DCIR value has been tampered with. Encrypting the DCIR value, the current time, and the hash value using the public key ensures the security of data transmission.

[0064] In the DCIR test working step configuration module, the DCIR test working steps include a first working step and a second working step; the second working step is executed after the first working step is completed;

[0065] The specific content of the first working step is: controlling the battery cell to charge and discharge for a duration of T with a current I 1 and sampling at the time of T r1 ; the T c1 is greater than T r1 ; c1 ;

[0066] The specific content of the second working step is: controlling the battery cell to charge and discharge for a duration of T with a current I 2 and sampling at the time of T r2 ; the T c2 is greater than T r2 ; c2 ;

[0067] In the test parameter distribution module, the test parameters include I 1 , T r1 , I 2 , T r2 and the corresponding working steps.

[0068] The DCIR value calculation module is specifically:

[0069] The middle-level computer, based on the DCIR test step, collects charge and discharge data including voltage V c1 and current I c1 from the lower-level computer at a time duration of T c1 , and also collects charge and discharge data including voltage V c2 and current I c2 from the lower-level computer at a time duration of T c2 . Based on the charge and discharge data, the DCIR value is calculated as follows:

[0070] DCIR = (V c1 - V c2 ) / (I c1 - I c2 ).

[0071] Based on the same inventive concept, this application provides an electronic device embodiment corresponding to Embodiment 1. For details, see Embodiment 3.

[0072] Embodiment 3

[0073] This embodiment provides a cell DCIR test device. As shown in Figure 3 , it includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, any implementation manner in Embodiment 1 can be realized.

[0074] Since the electronic device introduced in this embodiment is the device used to implement the method in Embodiment 1 of this application, based on the method introduced in Embodiment 1 of this application, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device realizes the method in Embodiment 1 of this application will not be introduced in detail here. As long as the device used by those skilled in the art to implement the method in Embodiment 1 of this application falls within the scope of protection of this application.

[0075] Based on the same inventive concept, this application provides a storage medium corresponding to Embodiment 1. For details, see Embodiment 4.

[0076] Embodiment 4

[0077] This embodiment provides a computer-readable storage medium. As shown in Figure 4 , a computer program is stored thereon. When the computer program is executed by the processor, any implementation manner in Embodiment 1 can be realized.

[0078] The technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0079] The configured DCIR test steps are sent to the middle-level machine by the upper-level machine. The middle-level machine parses the DCIR test steps to obtain the test parameters and sends them to the lower-level machine. The lower-level machine automatically controls the charging and discharging of the battery cell and the step switching based on the received test parameters. The middle-level machine then collects the charging and discharging data from the lower-level machine based on the DCIR test steps and calculates the DCIR value. That is, the step switching control is transferred from the middle-level machine to the lower-level machine. After the lower-level machine finishes executing the first step, it automatically executes the second step, reducing the step switching error and thus greatly improving the DCIR test accuracy.

[0080] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0081] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, apparatuses (systems), and computer program products of the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0082] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that realizes the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide means for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1Steps of functions specified in one or more boxes.

[0084] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative only and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should all be covered by the scope protected by the claims of the present invention.

Claims

1. A method for testing the DCIR of a battery cell, characterized in that: it includes the following steps: Step S10: The host computer configures the DCIR test steps and sends the DCIR test steps to the middle computer; the DCIR test steps include a first step and a second step; the second step is executed after the first step is completed; The specific first working step is as follows: with a current I 1 control the battery cell to perform charge and discharge for a duration of T r1 , and perform sampling at the time of the duration of T c1 ; the T r1 is greater than T c1 ; The specific second working step is: with a current I 2 to control the battery cell to perform charge and discharge for a duration of T r2 , and perform sampling at the time of the duration of T c2 ; the T r2 is greater than T c2 ; Step S20: The middle computer analyzes the received DCIR test steps, obtains the test parameters and sends them to the lower computer; Step S30: The lower computer automatically controls the charging and discharging of the battery cell and the step switching based on the received test parameters; Step S40: The middle computer collects the charging and discharging data from the lower computer based on the DCIR test steps, and calculates the DCIR value based on the charging and discharging data.

2. A method for testing the DCIR of a battery cell according to claim 1, characterized in that: In the step S20, the test parameters include I 1 , T r1 , I 2 , T r2 and the corresponding working steps.

3. A method for testing the DCIR of a battery cell according to claim 1, characterized in that: The specific content of step S40 is: The middle-level computer collects charge-discharge data including voltage V c1 and current I c1 from the lower-level computer during a time period of T c1 . It also collects charge-discharge data including voltage V c2 and current I c2 from the lower-level computer during a time period of T c2 . Based on the charge-discharge data, it calculates the DCIR value: DCIR = (V c1 - V c2 ) / (I c1 - I c2 ).

4. A system for testing the DCIR of a battery cell, characterized in that: it includes the following modules: A DCIR test step configuration module, which is used for the host computer to configure the DCIR test steps and send the DCIR test steps to the middle computer; the DCIR test steps include a first step and a second step; the second step is executed after the first step is completed; The specific first working step is as follows: using a current I 1 to control the battery cell to perform charge and discharge for a duration of T r1 , and perform sampling at the time of the duration of T c1 ; the T r1 is greater than T c1 ; The specific second working step is as follows: using a current I 2 to control the battery cell to perform charge and discharge for a duration of T r2 , and performing sampling at the time of the duration of T c2 ; the T r2 is greater than T c2 ; A test parameter distribution module, which is used for the middle computer to analyze the received DCIR test steps, obtain the test parameters and send them to the lower computer; A step execution module, which is used for the lower computer to automatically control the charging and discharging of the battery cell and the step switching based on the received test parameters; A DCIR value calculation module, which is used for the middle computer to collect the charging and discharging data from the lower computer based on the DCIR test steps, and calculate the DCIR value based on the charging and discharging data.

5. A system for testing the DCIR of a battery cell according to claim 4, characterized in that: In the test parameter sending module, the test parameters include I 1 , T r1 , I 2 , T r2 and the corresponding working steps.

6. A system for testing the DCIR of a battery cell according to claim 4, characterized in that: The specific content of the DCIR value calculation module is: The middle-level computer, based on the DCIR test step, collects charge and discharge data including voltage V c1 and current I c1 from the lower-level computer at a duration of T c1 , and collects charge and discharge data including voltage V c2 and current I c2 from the lower-level computer at a duration of T c2 . Based on the charge and discharge data, the DCIR value is calculated: DCIR = (V c1 - V c2 ) / (I c1 - I c2 )。 7. A device for testing the DCIR of a battery cell, including a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, when the processor executes the program, it implements the method according to any one of claims 1 to 3.

8. A medium for testing the DCIR of a battery cell, on which a computer program is stored, characterized in that, when the program is executed by the processor, it implements the method according to any one of claims 1 to 3.

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