A cell resistance measuring device, a measuring method and an OCV testing device

Abstract

The present invention provides a cell resistance measuring device, a measuring method and an OCV detection device, which belong to the technical field of lithium battery detection devices, wherein the cell resistance measuring device comprises: a measuring meter; a standard cell, which is arranged in series with the measuring meter, the resistance of the standard cell is suitable for being arranged equal to the resistance of the cell to be tested, the standard cell is suitable for being arranged side by side with the cell to be tested, and the measuring meter and the standard cell are suitable for being arranged in series with the cell to be tested, and the measuring meter is suitable for passing currents in opposite directions to the standard cell and the cell to be tested. In a cell resistance measuring device provided by the present invention, the currents passed by the measuring meter into the standard cell and the cell to be tested are equal in magnitude and opposite in direction, and due to electromagnetic induction, the eddy currents generated by the cell to be tested and the standard cell in the magnetic field are equal in magnitude and opposite in direction to cancel each other out, thereby reducing the influence of the eddy current on the detection value and improving the accuracy of the detection result.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery detection devices, and in particular to a cell resistance measuring device, a measuring method and an OCV detection device. Background Art

[0002] In the existing battery processing and manufacturing process, the OCV test of the battery is to test the battery's open circuit voltage, AC internal resistance, shell voltage, etc. The OCV test is an essential step before the battery leaves the factory. Only products that pass the OCV test can enter the market.

[0003] When testing internal resistance, alternating current is passed through the testing circuit. Due to the change of current in the AC circuit, the battery core as a conductor will generate an electromagnetic field. The battery core in the electromagnetic field will induce eddy currents, which will affect the magnitude of the current in the circuit and further affect the current reading in the resistance testing instrument. Since resistance = voltage / current, the calculated resistance will have deviations due to the deviation of the current from the actual value, resulting in inaccurate measurement results. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of inaccurate cell resistance measurement results in the prior art, thereby providing a cell resistance measurement device, a measurement method and an OCV detection device.

[0005] In order to solve the above problems, the present invention provides a battery cell resistance measuring device, comprising: a measuring meter; a standard battery cell, which is arranged in series with the measuring meter, the resistance of the standard battery cell is suitable to be set equal to the resistance of the battery cell to be measured, the standard battery cell is suitable to be arranged side by side with the battery cell to be measured, and the measuring meter and the standard battery cell are suitable to be arranged in series with the battery cell to be measured, and the measuring meter is suitable for passing currents in opposite directions to the standard battery cell and the battery cell to be measured.

[0006] Optionally, the positive pole of the measuring meter is connected to the negative pole of the standard battery cell through a first wire, the negative pole of the measuring meter is connected to the first end of the second wire, the positive pole of the standard battery cell is connected to the first end of the third wire, the second end of the second wire is suitable for connecting to the negative pole of the battery cell to be tested, and the second end of the third wire is suitable for connecting to the positive pole of the battery cell to be tested; or, the negative pole of the measuring meter is connected to the positive pole of the standard battery cell through a first wire, the positive pole of the measuring meter is connected to the first end of the second wire, the negative pole of the standard battery cell is connected to the first end of the third wire, the second end of the second wire is suitable for connecting to the positive pole of the battery cell to be tested, and the second end of the third wire is suitable for connecting to the negative pole of the battery cell to be tested.

[0007] Optionally, the first conductive wire and the second conductive wire are twisted together to form a twisted pair.

[0008] Optionally, the cell resistance measuring device further includes a first induction cell and a second induction cell, and the cell resistance measuring device is suitable for measuring respectively a plurality of cells to be tested that are arranged side by side, the resistance of the first induction cell and the resistance of the second induction cell are both suitable for being set equal to the resistance of the cell to be tested, the first induction cell and the second induction cell are both suitable for being arranged side by side with the cell to be tested, the standard cell is suitable for being arranged on the outside of the first ends of the plurality of cells to be tested, the first induction cell is suitable for being arranged on a side of the standard cell away from the cell to be tested, and the second induction cell is suitable for being arranged on the outside of the second ends of the plurality of cells to be tested.

[0009] Optionally, the standard battery cell, the first induction battery cell and the second induction battery cell are all suitable for having the same external dimensions as the battery cell to be tested.

[0010] Optionally, the cell to be tested located at the first end of the plurality of cells to be tested is a head-end cell to be tested, and the cell to be tested located at the second end of the plurality of cells to be tested is a terminal cell to be tested; the standard cell is suitable for forming a first center line with the head-end cell to be tested, and the first induction cell is suitable for being symmetrically arranged with the cell to be tested adjacent to the head-end cell to be tested through the first center line; the center line of the terminal cell to be tested is suitable for forming a second center line, and the second induction cell is suitable for being symmetrically arranged with the cell to be tested adjacent to the terminal cell to be tested through the second center line.

[0011] The present invention also provides a method for measuring the resistance of a battery cell, using the above-mentioned battery cell resistance measuring device, comprising: step S10: connecting a measuring meter, a standard battery cell and a battery cell to be measured in series, and the measuring meter supplies alternating current to the circuit; step S20: calculating the resistance value of the battery cell to be measured based on the measurement result of the measuring meter and the resistance value of the standard battery cell.

[0012] Optionally, the battery cell resistance measurement method further includes: step S30: using a battery cell resistance measurement device to sequentially measure a plurality of battery cells to be measured that are arranged side by side.

[0013] The present invention also provides an OCV detection device, comprising the above-mentioned cell resistance measuring device.

[0014] Optionally, the OCV detection equipment further includes a cell voltage detection device.

[0015] The present invention has the following advantages:

[0016] 1. A battery cell resistance measuring device provided by the present invention provides a standard battery cell with the same resistance as the battery cell to be measured. When measuring the resistance value of the battery cell to be measured, a measuring meter, a standard battery cell and the battery cell to be measured are arranged in series, and the battery cell to be measured and the standard battery cell are arranged side by side. Therefore, the currents passed by the measuring meter into the standard battery cell and the battery cell to be measured are equal in magnitude and opposite in direction. Due to electromagnetic induction, eddy currents generated in the battery cell to be measured and the standard battery cell in the magnetic field are equal in magnitude and opposite in direction to cancel each other out. Therefore, the influence of the eddy current on the detection value is reduced, and the accuracy of the detection result is improved.

[0017] 2. The present invention provides a battery core resistance measuring device, in which a first conductive wire and a second conductive wire are twisted together to form a twisted pair, thereby reducing the magnetic field area formed by the AC circuit, thereby reducing the magnetic flux and further reducing the generation of eddy currents.

[0018] 3. The present invention provides a battery cell resistance measuring device. When a plurality of battery cells to be tested arranged side by side are measured in turn, the battery cells to be tested located at the head and tail ends will be affected by the eddy currents generated by the battery cells to be tested adjacent to them. Therefore, a first induction battery cell and a second induction battery cell are respectively arranged on the outer sides of the battery cells to be tested at the head and tail ends, so as to utilize the eddy currents generated by the first induction battery cell and the second induction battery cell to offset the eddy currents of the battery cells to be tested adjacent to the battery cells to be tested at the head and tail ends, thereby ensuring the accuracy of the results when measuring a plurality of battery cells to be tested arranged side by side.

[0019] 4. The present invention provides a battery cell resistance measuring device, which sets the standard battery cell, the first induction battery cell and the second induction battery cell to have the same external dimensions as the battery cell to be measured, thereby improving the similarity of the sizes of eddy currents generated by the standard battery cell, the first induction battery cell, the second induction battery cell and the battery cell to be measured.

[0020] 5. The present invention provides a battery cell resistance measuring device, which ensures that the eddy currents are of the same size by symmetrically arranging the first induction battery cell and the battery cell to be tested adjacent to the first end battery cell to be tested, and symmetrically arranging the second induction battery cell and the battery cell to be tested adjacent to the last end battery cell to be tested, so as to offset each other as much as possible and reduce the influence of the eddy currents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram showing the structure of the cell resistance measuring device provided in Embodiment 1 of the present invention when measuring a single cell to be tested;

[0023] Figure 2 The schematic diagram shows the structure of the battery cell resistance measuring device provided in the first embodiment of the present invention when measuring a plurality of battery cells to be tested arranged side by side.

[0024] Description of reference numerals:

[0025] 10. Measuring meter; 20. Standard battery cell; 30. Battery cell to be tested; 31. First-end battery cell to be tested; 32. Terminal battery cell to be tested; 40. First conductor; 50. Second conductor; 60. Third conductor; 70. First induction battery cell; 80. Second induction battery cell. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] like Figure 1 and Figure 2A specific embodiment of the cell resistance measuring device shown includes: a measuring meter 10 and a standard cell 20. The standard cell 20 is arranged in series with the measuring meter 10, the resistance of the standard cell 20 is set equal to the resistance of the cell 30 to be tested, the standard cell 20 and the cell 30 to be tested are arranged side by side, and the measuring meter 10, the standard cell 20 and the cell 30 to be tested are arranged in series, so the measuring meter 10 can pass currents of equal magnitude and opposite directions to the standard cell 20 and the cell 30 to be tested.

[0032] Due to electromagnetic induction, the eddy currents generated by the test cell 30 and the standard cell 20 in the magnetic field are equal in magnitude and opposite in direction, so the two eddy currents can cancel each other out, thereby reducing the impact of the eddy current on the detection value and improving the accuracy of the detection result.

[0033] like Figure 1 and Figure 2 As shown, the positive electrode of the measuring meter 10 is connected to the negative electrode of the standard battery cell 20 through the first wire 40, the negative electrode of the measuring meter 10 is connected to the first end of the second wire 50, and the positive electrode of the standard battery cell 20 is connected to the first end of the third wire 60. When measuring the battery cell 30 to be tested, the second end of the second wire 50 is connected to the negative electrode of the battery cell 30 to be tested, and the second end of the third wire 60 is connected to the positive electrode of the battery cell 30 to be tested.

[0034] Of course, the first wire 40 can also connect the negative pole of the measuring meter 10 and the positive pole of the standard battery cell 20, the first end of the second wire 50 is connected to the positive pole of the measuring meter 10, and the first end of the third wire 60 is connected to the negative pole of the standard battery cell 20. Therefore, when measuring the battery cell 30 to be tested, the second end of the second wire 50 is connected to the positive pole of the battery cell 30 to be tested, and the second end of the third wire 60 is connected to the negative pole of the battery cell 30 to be tested.

[0035] like Figure 1 and Figure 2 As shown, the first conductor 40 and the second conductor 50 are twisted together to form a twisted pair, which can reduce the magnetic field area formed by the AC circuit, thereby reducing the magnetic flux and further reducing the generation of eddy current.

[0036] like Figure 1 As shown, the cell resistance measuring device is used to measure a single cell 30 to be tested, and the eddy currents generated by the cell 30 to be tested in the magnetic field and the eddy currents generated by the standard cell 20 in the magnetic field can offset each other, thereby reducing the influence of the eddy currents on the measurement results.

[0037] like Figure 2As shown, in actual testing, usually not only one single battery cell 30 to be tested is tested, but several battery cells 30 to be tested placed side by side on the tray are tested in sequence. Since the several battery cells 30 to be tested are conductors in the magnetic field, eddy currents will be generated under the action of the magnetic field, thereby affecting the measurement results. Therefore, in this embodiment, Figure 2 As shown, the cell resistance measuring device further includes a first induction cell 70 and a second induction cell 80 , and the resistance of the first induction cell 70 and the resistance of the second induction cell 80 are both set to be equal to the resistance of the cell 30 to be measured.

[0038] Specifically, Figure 2 As shown, the first induction cell 70 and the second induction cell 80 are arranged side by side with the cells to be tested 30, the standard cell 20 is arranged outside the first ends of the plurality of cells to be tested 30, the first induction cell 70 is arranged on the side of the standard cell 20 away from the cells to be tested 30, and the second induction cell 80 is arranged outside the second ends of the plurality of cells to be tested 30. Figure 2 The first induction cell 70, the standard cell 20, the plurality of cells to be tested 30 and the second induction cell 80 are arranged side by side from top to bottom.

[0039] When measuring a plurality of battery cells 30 to be tested that are arranged side by side in sequence, the battery cells 30 to be tested that are located at the head and tail ends will be affected by the eddy currents generated by the battery cells 30 to be tested that are adjacent to them. Therefore, by respectively arranging the first induction battery cell 70 and the second induction battery cell 80 on the outer sides of the battery cells 30 to be tested at the head and tail ends, the eddy currents generated by the first induction battery cell 70 and the second induction battery cell 80 can be utilized to offset the eddy currents of the battery cells 30 to be tested that are adjacent to the battery cells 30 to be tested at the head and tail ends, thereby ensuring the accuracy of the results when measuring a plurality of battery cells 30 to be tested that are arranged side by side.

[0040] In this embodiment, if Figure 2 As shown, the test cell 30 located at the first end of the plurality of test cells 30 is the head test cell 31, and the test cell 30 located at the second end of the plurality of test cells 30 is the end test cell 32. A first center line is formed between the standard cell 20 and the head test cell 31, and the first induction cell 70 and the test cell 30 adjacent to the head test cell 31 are symmetrically arranged through the first center line; the center line of the end test cell 32 is the second center line, and the second induction cell 80 and the test cell 30 adjacent to the end test cell 32 are symmetrically arranged through the second center line.

[0041] By symmetrically arranging the first induction cell 70 and the cell 30 to be tested adjacent to the head cell 31 , and symmetrically arranging the second induction cell 80 and the cell 30 to be tested adjacent to the end cell 32 , the sizes of the eddy currents are ensured to be the same, so as to offset each other as much as possible and reduce the impact of the eddy currents.

[0042] It is worth mentioning that please refer to Figure 2 , the first ends of the plurality of cells 30 to be tested are Figure 2 The upper ends of the plurality of cells 30 to be tested are respectively the upper ends of the plurality of cells 30 to be tested, and correspondingly, the second ends of the plurality of cells 30 to be tested are Figure 2 The lower ends of several cells 30 to be tested are as follows. Figure 2 As shown, five cells to be tested 30 are arranged side by side on the tray, the cell to be tested 30 at the top is the head cell to be tested 31, and the cell to be tested 30 at the bottom is the end cell to be tested 32. Figure 2 Taking several cells to be tested 30 as an example, each cell to be tested 30 is numbered from top to bottom as the first cell to be tested 31, the second cell to be tested, the third cell to be tested, the fourth cell to be tested and the end cell to be tested 32. Therefore, the first induction cell 70 and the second cell to be tested are symmetrically arranged through the first center line, and the second induction cell 80 and the fourth cell to be tested are symmetrically arranged through the second center line. Then, when measuring the first cell to be tested 31, the eddy currents generated by the first induction cell 70 and the second cell to be tested cancel each other; when measuring the end cell to be tested 32, the eddy currents generated by the second induction cell 80 and the fourth cell to be tested cancel each other. Moreover, when measuring the second battery cell to be tested, the eddy currents of the first end battery cell 31 to be tested and the third battery cell to be tested cancel each other out; when measuring the third battery cell to be tested, the eddy currents of the second battery cell to be tested and the fourth battery cell to be tested cancel each other out; when measuring the fourth battery cell to be tested, the eddy currents of the third battery cell to be tested and the end battery cell 32 to be tested cancel each other out; that is, when measuring the battery cell 30 to be tested located in the middle position, the eddy currents of the battery cells 30 to be tested on both sides adjacent to it cancel each other out.

[0043] It is worth further explaining that when measuring the first-end test cell 31, not only the second test cell will generate eddy currents, but in fact the third test cell, the fourth test cell and the terminal test cell 32 will all generate eddy currents. However, the third test cell, the fourth test cell and the terminal test cell 32 are far away from the first-end test cell 31, the electromagnetic field is weak, and the eddy currents generated are small, so they can be ignored. Similarly, when measuring the terminal test cell 32, the eddy currents generated by the third test cell, the second test cell and the first-end test cell 31 can also be ignored.

[0044] In this embodiment, the standard cell 20 , the first induction cell 70 , and the second induction cell 80 have the same dimensions as the cell to be tested 30 , so as to improve the similarity of the eddy currents generated by the standard cell 20 , the first induction cell 70 , the second induction cell 80 , and the cell to be tested 30 .

[0045] It is worth noting that in the OCV test, the resistance of the battery cell is measured to detect whether the resistance of the battery cell is approximately the same as the predetermined resistance value. If the resistance value of the battery cell exceeds the predetermined range, it means that the battery cell is unqualified. Therefore, the above-mentioned setting of the standard battery cell 20, the first induction battery cell 70, and the second induction battery cell 80 to have the same resistance value as the battery cell 30 to be tested means that the standard battery cell 20, the first induction battery cell 70, and the second induction battery cell 80 can be set to have the same theoretical predetermined resistance value as the battery cell 30 to be tested.

[0046] Example 2

[0047] This embodiment provides a specific implementation of a method for measuring cell resistance, using the cell resistance measuring device in Example 1 to measure the resistance of the cell 30 to be measured, including the following steps:

[0048] Step S10: The measuring meter 10, the standard battery cell 20 and the battery cell to be tested 30 are connected in series, and the measuring meter 10 supplies alternating current to the circuit.

[0049] Step S20: Calculate the resistance value of the battery cell 30 to be tested according to the measurement result of the measuring table 10 and the resistance value of the standard battery cell 20;

[0050] Specifically, the current passing through the standard battery cell 20 is equal to the current passing through the battery cell to be tested 30 in magnitude and opposite in direction. Due to electromagnetic induction, the battery cell to be tested 30 in the magnetic field will generate a first eddy current, and the standard battery cell 20 in the magnetic field will generate a second eddy current. The first eddy current and the second eddy current are equal in magnitude and opposite in direction, and the first eddy current and the second eddy current cancel each other out. The measuring meter 10 measures the total resistance of the standard battery cell 20 and the battery cell to be tested 30, and the resistance of the battery cell to be tested 30 is obtained by subtracting the resistance of the standard battery cell 20 from the total resistance.

[0051] Step S30: using a cell resistance measuring device to sequentially measure a plurality of cells 30 to be tested that are arranged side by side;

[0052] Specifically, when the head-end cell 31 to be tested and the end-end cell 32 to be tested are measured respectively, due to electromagnetic induction, the cell 30 to be tested adjacent to the cell under test in the magnetic field will generate a third eddy current, and the first induction cell 70 or the second induction cell 80 in the magnetic field will generate a fourth eddy current, the third eddy current and the fourth eddy current are equal in magnitude and opposite in direction, and the third eddy current and the fourth eddy current cancel each other out; when the cell 30 to be tested located between the head-end cell 31 to be tested and the end-end cell 32 to be tested are measured respectively, due to electromagnetic induction, the two cells to be tested 30 adjacent to the cell under test in the magnetic field will generate a fifth eddy current and a sixth eddy current, respectively, the fifth eddy current and the sixth eddy current are equal in magnitude and opposite in direction, and the fifth eddy current and the sixth eddy current cancel each other out.

[0053] Example 3

[0054] This embodiment provides a specific implementation of an OCV detection device, including the cell resistance measurement device in Example 1. By connecting the standard cell 20 in series in the circuit, the eddy current generated by the standard cell 20 in the magnetic field and the eddy current generated by the cell to be tested 30 cancel each other out, reducing the influence of the eddy current on the detection value and improving the accuracy of the detection result.

[0055] In this embodiment, the OCV detection device further includes a cell voltage detection device, which is used to detect the open circuit voltage of the cell 30 to be tested.

[0056] According to the above description, this patent application has the following advantages:

[0057] 1. When measuring a single cell to be tested, a standard cell is added to the detection circuit. The eddy current generated by the standard cell offsets the eddy current of the cell to be tested, so that the eddy current in the circuit is as small as possible to ensure the accuracy of the test data;

[0058] 2. When measuring several cells to be tested arranged side by side in sequence, a first induction cell and a second induction cell are also provided. The eddy currents generated by the first induction cell and the second induction cell are used to offset the eddy currents of the cells to be tested adjacent to the cells to be tested at the head and tail ends, thereby ensuring the accuracy of the results when measuring several cells to be tested arranged side by side.

[0059] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A cell resistance measuring device, characterized in that: include: Measurement table (10); A standard battery cell (20) is arranged in series with the measuring meter (10); the resistance of the standard battery cell (20) is suitable for being arranged equal to the resistance of the battery cell (30) to be measured; the standard battery cell (20) is suitable for being arranged side by side with the battery cell (30) to be measured; the measuring meter (10) and the standard battery cell (20) are suitable for being arranged in series with the battery cell (30) to be measured; and the measuring meter (10) is suitable for passing currents in opposite directions to the standard battery cell (20) and the battery cell (30) to be measured.

2. The cell resistance measuring device according to claim 1, characterized in that: The positive electrode of the measuring meter (10) is connected to the negative electrode of the standard battery cell (20) via a first wire (40), the negative electrode of the measuring meter (10) is connected to the first end of a second wire (50), the positive electrode of the standard battery cell (20) is connected to the first end of a third wire (60), the second end of the second wire (50) is suitable for being connected to the negative electrode of the battery cell (30) to be tested, and the second end of the third wire (60) is suitable for being connected to the positive electrode of the battery cell (30) to be tested; or, The negative electrode of the measuring meter (10) is connected to the positive electrode of the standard battery cell (20) via a first wire (40); the positive electrode of the measuring meter (10) is connected to the first end of a second wire (50); the negative electrode of the standard battery cell (20) is connected to the first end of a third wire (60); the second end of the second wire (50) is suitable for being connected to the positive electrode of the battery cell (30) to be measured; and the second end of the third wire (60) is suitable for being connected to the negative electrode of the battery cell (30) to be measured.

3. The cell resistance measuring device according to claim 2, characterized in that: The first conductive wire (40) and the second conductive wire (50) are twisted together to form a twisted pair.

4. The cell resistance measuring device according to any one of claims 1 to 3, characterized in that: The cell resistance measuring device further comprises a first induction cell (70) and a second induction cell (80), and the cell resistance measuring device is suitable for measuring a plurality of cells (30) to be tested that are arranged side by side, respectively; the resistance of the first induction cell (70) and the resistance of the second induction cell (80) are both suitable for being arranged equal to the resistance of the cell (30) to be tested, the first induction cell (70) and the second induction cell (80) are both suitable for being arranged side by side with the cell (30) to be tested, the standard cell (20) is suitable for being arranged outside the first ends of the plurality of cells (30) to be tested, the first induction cell (70) is suitable for being arranged on a side of the standard cell (20) away from the cell (30) to be tested, and the second induction cell (80) is suitable for being arranged outside the second ends of the plurality of cells (30) to be tested.

5. The cell resistance measuring device according to claim 4, characterized in that: The standard battery cell (20), the first induction battery cell (70) and the second induction battery cell (80) are all suitable for having the same external dimensions as the battery cell (30) to be tested.

6. The cell resistance measuring device according to claim 4, characterized in that: The battery cell (30) to be tested located at the first end of the plurality of battery cells (30) to be tested is a head-end battery cell (31) to be tested, and the battery cell (30) to be tested located at the second end of the plurality of battery cells (30) to be tested is a terminal battery cell (32); The standard cell (20) is adapted to form a first center line with the first end cell to be tested (31), and the first induction cell (70) is adapted to be symmetrically arranged with the cell to be tested (30) adjacent to the first end cell to be tested (31) via the first center line; The center line of the terminal cell to be tested (32) is suitable for forming a second center line, and the second induction cell (80) is suitable for being symmetrically arranged with the cell to be tested (30) adjacent to the terminal cell to be tested (32) via the second center line.

7. A method for measuring cell resistance, using the cell resistance measuring device according to any one of claims 1 to 6, characterized in that: include: Step S10: the measuring meter (10), the standard battery cell (20) and the battery cell to be tested (30) are connected in series, and the measuring meter (10) supplies alternating current to the circuit; Step S20: Calculate the resistance value of the battery cell (30) to be tested based on the measurement result of the measurement table (10) and the resistance value of the standard battery cell (20).

8. The method for measuring cell resistance according to claim 7, characterized in that: The cell resistance measuring device is the cell resistance measuring device according to claim 6, and the cell resistance measuring method further comprises: Step S30: using a cell resistance measuring device to sequentially measure a plurality of cells (30) to be tested that are arranged side by side.

9. An OCV detection device, characterized in that: A cell resistance measuring device comprising the device described in any one of claims 1 to 6.

10. The OCV detection device according to claim 9, characterized in that: The OCV detection device also includes a cell voltage detection device.

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