A multi-channel internal resistance test automatic compensation method and system

Abstract

The present invention provides a multi-channel internal resistance test automatic compensation method and system in the field of battery test technology. The method includes the following steps: Step S1, press the probe of the A test circuit of the internal resistance meter on the A channel zero-clearing module, and press the probe of the B test circuit on the B channel zero-clearing module; Step S2, after the internal resistance meter performs self-check, turn on the relay of the A test circuit, short-circuit the A test circuit through the A channel zero-clearing module, and then zero-clear the A test circuit; Step S3, obtain the measured value A of the A test circuit, and verify the zero-clearing result of the A test circuit based on the measured value A; Step S4, the internal resistance meter turns on the relay of the B test circuit and obtains the measured value B of the B test circuit; Step S5, calculate the channel difference value based on the measured value A and the measured value B, and perform automatic compensation for the internal resistance test based on the channel difference value. The advantages of the present invention are: greatly improving the accuracy of the internal resistance test.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and particularly to a multi-channel internal resistance testing automatic compensation method and system. Background Art

[0002] After the battery is produced, a series of tests need to be carried out, and the test contents include internal resistance value, OCV value, shell voltage value, etc. The battery includes a plurality of battery cells. When testing the internal resistance of the battery, generally, the internal resistance of each battery cell is tested through the multi-channel test circuit of the internal resistance tester, and then the internal resistances of each battery cell are accumulated to obtain the internal resistance of the battery.

[0003] Due to the differences in the internal resistances of the test circuits of the internal resistance tester, that is, the poor internal resistance consistency, and the small internal resistance of the battery cells, there are large deviations in the internal resistances measured by each test circuit. Therefore, how to provide a multi-channel internal resistance testing automatic compensation method and system to improve the accuracy of internal resistance testing has become an urgent technical problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a multi-channel internal resistance testing automatic compensation method and system to improve the accuracy of internal resistance testing.

[0005] In a first aspect, the present invention provides a multi-channel internal resistance testing automatic compensation method, including the following steps:

[0006] Step S1: Press the probe of the A test circuit of the internal resistance tester on the A-channel zeroing module, and press the probe of the B test circuit on the B-channel zeroing module;

[0007] Step S2: After the internal resistance tester performs self-check, turn on the relay of the A test circuit, short-circuit the A test circuit through the A-channel zeroing module, and then zero the A test circuit;

[0008] Step S3: Obtain the measured value A of the A test circuit, and verify the zeroing result of the A test circuit based on the measured value A;

[0009] Step S4: The internal resistance tester turns on the relay of the B test circuit and obtains the measured value B of the B test circuit;

[0010] Step S5: Calculate the channel difference value based on the measured value A and the measured value B, and perform automatic compensation for the internal resistance test based on the channel difference value.

[0011] Further, in the step S1, both the A-channel zeroing module and the B-channel zeroing module include two zeroing copper bars and two wires. Both ends of each wire are respectively connected to a zeroing copper bar to form a four-wire zeroing circuit.

[0012] Further, the specific steps of step S3 are as follows:

[0013] A test circuit is connected in series with a standard resistor to obtain the measured value A of the A test circuit. It is determined whether the measured value A is consistent with the resistance value of the standard resistor. If so, the zero clearing is successful and step S4 is entered; if not, the zero clearing fails and an alarm prompt is given.

[0014] Further, the specific steps of step S4 are as follows:

[0015] The internal resistance meter conducts the relay of the B test circuit, shorts the B test circuit through the B channel zero clearing module, continuously reads n measured values B' of the B test circuit, and calculates the average value of the n measured values B' to obtain the measured value B; n is a positive integer.

[0016] Further, in step S5, the calculation formula for the channel difference value is as follows:

[0017] Channel difference value = abs(measured value A - measured value B).

[0018] In a second aspect, the present invention provides a multi-channel internal resistance test automatic compensation system, including the following modules:

[0019] An initialization module, which is used to press the probe of the A test circuit of the internal resistance meter on the A channel zero clearing module, and press the probe of the B test circuit on the B channel zero clearing module;

[0020] An A test circuit zero clearing module, which is used to conduct the relay of the A test circuit after the internal resistance meter performs self-check, short the A test circuit through the A channel zero clearing module, and then zero clear the A test circuit;

[0021] A zero clearing result verification module, which is used to obtain the measured value A of the A test circuit and verify the zero clearing result of the A test circuit based on the measured value A;

[0022] A B test circuit conduction module, which is used to conduct the relay of the B test circuit of the internal resistance meter and obtain the measured value B of the B test circuit;

[0023] A test compensation module, which is used to calculate the channel difference value based on the measured value A and the measured value B, and perform automatic compensation for the internal resistance test based on the channel difference value.

[0024] Further, in the initialization module, both the A channel zero clearing module and the B channel zero clearing module include two zero clearing copper bars and two wires. Both ends of each wire are respectively connected to a zero clearing copper bar to form a four-wire zero clearing circuit.

[0025] Further, the zero clearing result verification module is specifically:

[0026] A test circuit is connected in series with a standard resistor to obtain the measured value A of the A test circuit. It is determined whether the measured value A is consistent with the resistance value of the standard resistor. If so, the zeroing is successful and the B test circuit conduction module is entered; if not, the zeroing fails and an alarm prompt is given.

[0027] Further, the B test circuit conduction module is specifically:

[0028] The relay of the B test circuit is turned on by the internal resistance meter, and the B test circuit is short-circuited through the B channel zeroing module. N measured values B' of the B test circuit are continuously read, and the average value of the n measured values B' is calculated to obtain the measured value B; n is a positive integer.

[0029] Further, in the test compensation module, the calculation formula for the channel difference value is:

[0030] Channel difference value = abs(measured value A - measured value B).

[0031] The advantages of the present invention are:

[0032] By pressing the probe of the A test circuit on the A channel zeroing module and pressing the probe of the B test circuit on the B channel zeroing module, after turning on the relay of the A test circuit for zeroing, using the measured value A of the A test circuit as the standard value, and then turning on the relay of the B test circuit for zeroing, the measured value B of the B test circuit is obtained. The absolute difference between the measured value A and the measured value B is calculated to obtain the channel difference value. When the B test circuit is normally tested later, the channel difference value is used to compensate the measured internal resistance, which can improve the internal resistance consistency of the A test circuit and the B test circuit, and ultimately greatly improve the internal resistance test accuracy. Description of the Drawings

[0033] The following further describes the present invention with reference to the accompanying drawings in conjunction with embodiments.

[0034] Figure 1 It is a flowchart of a multi-channel internal resistance test automatic compensation method of the present invention.

[0035] Figure 2 It is a structural schematic diagram of a multi-channel internal resistance test automatic compensation system of the present invention.

[0036] Figure 3 It is a structural schematic diagram of the zeroing device of the present invention.

[0037] Marking Explanation:

[0038] 100 - Zeroing device, 1 - Fixed base, 2 - A channel zeroing module, 3 - B channel zeroing module, 21 - Zeroing copper bar, 22 - Wire. Detailed Embodiments

[0039] The overall idea of the technical solution in the embodiments of this application is as follows: After clearing the A test loop, using the measured value A of the A test loop as the standard value, then clearing the B test loop to obtain the measured value B of the B test loop, calculating the absolute difference between the measured value A and the measured value B to obtain the channel difference value, and compensating the internal resistance test based on the channel difference value to improve the accuracy of the internal resistance test.

[0040] The present invention needs to use a clearing device 100 as follows, which includes a fixed base 1, an A-channel clearing module 2, and a B-channel clearing module 3. The A-channel clearing module 2 and the B-channel clearing module 3 are both installed on the fixed base 1;

[0041] Both the A-channel clearing module 2 and the B-channel clearing module 3 include two clearing copper bars 21 and two wires 22. Both ends of each wire 22 are respectively connected to a clearing copper bar 21 to form a four-wire clearing loop; the two clearing copper bars 21 have the same specifications, and the two wires 22 have the same specifications.

[0042] Please refer to Figures 1 to 3 As shown in the preferred embodiment of a multi-channel internal resistance test automatic compensation method of the present invention, it includes the following steps:

[0043] Step S1: Press the probe of the A test loop of the internal resistance meter on the A-channel clearing module, and press the probe of the B test loop on the B-channel clearing module;

[0044] Step S2: After the internal resistance meter performs self-check, turn on the relay of the A test loop, short-circuit the A test loop through the A-channel clearing module, and then clear the A test loop;

[0045] Step S3: Obtain the measured value A of the A test loop, and verify the clearing result of the A test loop based on the measured value A;

[0046] Step S4: The internal resistance meter turns on the relay of the B test loop and obtains the measured value B of the B test loop;

[0047] Step S5: Calculate the channel difference value based on the measured value A and the measured value B, and perform automatic compensation for the internal resistance test based on the channel difference value, that is, when actually performing the internal resistance test, the actual internal resistance value = the measured value of the internal resistance meter - the channel difference value.

[0048] That is, the present invention compensates the internal resistance test by using the channel difference value by pre-measuring the channel difference values of different test loops to overcome the problem that the internal resistances of each test loop are different. In specific implementation, it is not limited to two test loops, and several test loops can be compensated. The present invention can test the multi-channel internal resistance with only one internal resistance meter without adding an additional internal resistance meter, reducing the cost of internal resistance testing.

[0049] In the step S1, both the A-channel zero-clearing module and the B-channel zero-clearing module include two zero-clearing copper bars and two wires. Both ends of each wire are respectively connected to a zero-clearing copper bar to form a four-wire zero-clearing loop.

[0050] The step S3 is specifically as follows:

[0051] A standard resistor is connected in series to the A test loop to obtain the measured value A of the A test loop. It is judged whether the measured value A is consistent with the resistance value of the standard resistor. If so, the zero-clearing is successful and step S4 is entered; if not, the zero-clearing fails and an alarm prompt is given.

[0052] The step S4 is specifically as follows:

[0053] The internal resistance meter conducts the relay of the B test loop, shorts the B test loop through the B-channel zero-clearing module, continuously reads n measured values B' of the B test loop, and calculates the average value of the n measured values B' to obtain the measured value B; n is a positive integer, and the preferred value is 3. Continuously reading the average of n measured values B' greatly improves the accuracy of the measured value B.

[0054] In the step S5, the calculation formula of the channel difference value is:

[0055] Channel difference value = abs(measured value A - measured value B).

[0056] A preferred embodiment of a multi-channel internal resistance test automatic compensation system of the present invention includes the following modules:

[0057] An initialization module for pressing the probe of the A test loop of the internal resistance meter on the A-channel zero-clearing module and pressing the probe of the B test loop on the B-channel zero-clearing module;

[0058] An A test loop zero-clearing module for, after the internal resistance meter performs self-check, conducting the relay of the A test loop and shorting the A test loop through the A-channel zero-clearing module, thereby clearing the A test loop;

[0059] A zero-clearing result verification module for obtaining the measured value A of the A test loop and verifying the zero-clearing result of the A test loop based on the measured value A;

[0060] A B test loop conduction module for the internal resistance meter to conduct the relay of the B test loop and obtain the measured value B of the B test loop;

[0061] A test compensation module for calculating the channel difference value based on the measured value A and the measured value B, and automatically compensating the internal resistance test based on the channel difference value, that is, when actually performing the internal resistance test, the actual internal resistance value = the measured value of the internal resistance meter - the channel difference value.

[0062] That is, the present invention pre-measures the channel difference values of different test circuits, and then uses the channel difference values to compensate for the internal resistance test to overcome the problem that the internal resistances of each test circuit are different. In specific implementation, it is not limited to two test circuits, and several test circuits can be compensated. The present invention can test the multi-channel internal resistance with only one internal resistance meter, without adding an additional internal resistance meter, reducing the cost of internal resistance test.

[0063] In the initialization module, the A-channel zero-clearing module and the B-channel zero-clearing module both include two zero-clearing copper bars and two wires. The two ends of each wire are respectively connected to a zero-clearing copper bar to form a four-wire zero-clearing circuit.

[0064] The zero-clearing result verification module is specifically:

[0065] A standard resistor is connected in series in the A test circuit to obtain the measured value A of the A test circuit. It is judged whether the measured value A is consistent with the resistance value of the standard resistor. If so, the zero-clearing is successful and the B test circuit conduction module is entered; if not, the zero-clearing fails and an alarm prompt is given.

[0066] The B test circuit conduction module is specifically:

[0067] The relay of the B test circuit of the internal resistance meter is turned on, and the B test circuit is short-circuited through the B-channel zero-clearing module. n measured values B' of the B test circuit are continuously read, and the average value of the n measured values B' is calculated to obtain the measured value B; n is a positive integer, and the preferred value is 3. Continuously reading the average of n measured values B' greatly improves the accuracy of the measured value B.

[0068] In the test compensation module, the calculation formula of the channel difference value is:

[0069] Channel difference value = abs(measured value A - measured value B).

[0070] To sum up, the advantages of the present invention are:

[0071] By pressing the probe of the A test circuit on the A-channel zero-clearing module, pressing the probe of the B test circuit on the B-channel zero-clearing module, after turning on the relay of the A test circuit for zero-clearing, using the measured value A of the A test circuit as the standard value, and then turning on the relay of the B test circuit for zero-clearing, obtaining the measured value B of the B test circuit, calculating the absolute difference between the measured value A and the measured value B to obtain the channel difference value. When the B test circuit is normally tested later, using the channel difference value to compensate for the measured internal resistance can improve the internal resistance consistency of the A test circuit and the B test circuit, and ultimately greatly improve the internal resistance test accuracy.

[0072] 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 used 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 multi-channel internal resistance test automatic compensation method, characterized in that: It includes the following steps: Step S1: Press the probe of the A test circuit of the internal resistance meter on the A channel zero-clearing module, and press the probe of the B test circuit on the B channel zero-clearing module; both the A channel zero-clearing module and the B channel zero-clearing module include two zero-clearing copper bars and two wires, and both ends of each wire are respectively connected to a zero-clearing copper bar to form a four-wire zero-clearing circuit; Step S2: After the internal resistance meter performs self-check, turn on the relay of the A test circuit, short-circuit the A test circuit through the A channel zero-clearing module, and then zero-clear the A test circuit; Step S3: Obtain the measured value A of the A test circuit, and verify the zero-clearing result of the A test circuit based on the measured value A; Step S4: The internal resistance meter turns on the relay of the B test circuit and obtains the measured value B of the B test circuit; Step S5: Calculate the channel difference value based on the measured value A and the measured value B, and perform automatic compensation for the internal resistance test based on the channel difference value; the calculation formula for the channel difference value is: Channel difference value = abs(measured value A - measured value B).

2. The multi-channel internal resistance test automatic compensation method according to claim 1, characterized in that: The specific content of step S3 is: Connect a standard resistor in series to the A test circuit, obtain the measured value A of the A test circuit, and determine whether the measured value A is consistent with the resistance value of the standard resistor. If so, the zero-clearing is successful, and proceed to step S4; if not, the zero-clearing fails, and an alarm prompt is given.

3. The automatic compensation method for multi-channel internal resistance measurement according to claim 1, characterized in that: The specific content of step S4 is: The internal resistance meter turns on the relay of the B test circuit, short-circuits the B test circuit through the B channel zero-clearing module, continuously reads n measured values B' of the B test circuit, and calculates the average value of the n measured values B' to obtain the measured value B; n is a positive integer.

4. A multi-channel internal resistance test automatic compensation system, characterized in that: It includes the following modules: Initialization module, which is used to press the probe of the A test circuit of the internal resistance meter on the A channel zero-clearing module, and press the probe of the B test circuit on the B channel zero-clearing module; both the A channel zero-clearing module and the B channel zero-clearing module include two zero-clearing copper bars and two wires, and both ends of each wire are respectively connected to a zero-clearing copper bar to form a four-wire zero-clearing circuit; A test circuit zero-clearing module, which is used to turn on the relay of the A test circuit after the internal resistance meter performs self-check, short-circuit the A test circuit through the A channel zero-clearing module, and then zero-clear the A test circuit; Zero-clearing result verification module, which is used to obtain the measured value A of the A test circuit and verify the zero-clearing result of the A test circuit based on the measured value A; B test circuit conduction module, which is used to turn on the relay of the B test circuit by the internal resistance meter and obtain the measured value B of the B test circuit; Test compensation module, which is used to calculate the channel difference value based on the measured value A and the measured value B, and perform automatic compensation for the internal resistance test based on the channel difference value; the calculation formula for the channel difference value is: Channel difference value = abs(measured value A - measured value B).

5. The multi-channel internal resistance test automatic compensation system according to claim 4, wherein: The specific content of the zero-clearing result verification module is: Connect a standard resistor in series to the A test circuit, obtain the measured value A of the A test circuit, and determine whether the measured value A is consistent with the resistance value of the standard resistor. If so, the zero-clearing is successful, and enter the B test circuit conduction module; if not, the zero-clearing fails, and an alarm prompt is given.

6. The multi-channel internal resistance test automatic compensation system according to claim 4, characterized in that: The specific content of the B test circuit conduction module is: The relay of the internal resistance meter turns on the B test circuit, shorts the B test circuit through the B-channel zero-clearing module, continuously reads n measured values B' of the B test circuit, and calculates the average value of the n measured values B' to obtain the measured value B; n is a positive integer.

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