Battery cell testing device

Abstract

The utility model discloses a battery cell testing device, including test box, pressure transmission medium and pressure applying mechanism, the pressure transmission medium is located in the test box, when the battery cell is tested, the battery cell to be tested is placed in the test box, the pressure applying mechanism applies pressure to the battery cell through the pressure transmission medium. According to the utility model, when the battery cell is tested, the stress on each part of the stress surface of the battery cell is uniform, and the accuracy of a test result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core testing device. Background Art

[0002] When soft-pack batteries are undergoing cycle testing, in order to simulate the pressure conditions of the soft-pack batteries in the module, a clamp is used to apply pressure to the upper and lower surfaces of the battery cell so that the pressure applied to the battery cell is consistent with the pressure in the module. The clamp is generally composed of a hard metal plate. However, during the manufacturing process of soft-pack batteries, the upper and lower surfaces are not completely flat; in addition, during the cycle process, the volume expands and contracts periodically, and the expansion and contraction ratios of the regions are not completely consistent. Both of these factors cause the pressures on different areas of the battery cell to be inconsistent when the hard metal plate is pressed on the uneven surface of the battery cell, resulting in the actual working pressure during the battery cell test not being equal to the set pressure, affecting the accuracy of the test results. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a battery cell testing device to ensure that the pressure on the stress-bearing surface of the battery cell is uniform when the battery cell is tested, thereby improving the accuracy of the test results.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A battery cell testing device comprises a test box, a pressure transmission medium and a pressure applying mechanism, wherein the pressure transmission medium is located in the test box. During the battery cell testing, the battery cell to be tested is placed in the test box, and the pressure applying mechanism applies pressure to the battery cell through the pressure transmission medium.

[0006] In one embodiment, when the pressure-applying mechanism applies pressure to the battery cell through the pressure-transmitting medium, the pressure borne by each part of the surface of the battery cell is equal.

[0007] In one embodiment, the pressure transmission medium is dispersed in the test box, and when the battery cell is placed in the test box, the pressure transmission medium is in direct contact with the battery cell.

[0008] In one embodiment, a marking line is provided in the test box to mark the maximum filling amount of the pressure transmission medium in the test box.

[0009] In one embodiment, the pressure mechanism includes a first pressure plate and a cylinder, the output end of the cylinder is connected to the first pressure plate, and the first pressure plate is arranged parallel to and opposite to the battery cell.

[0010] In one embodiment, the battery cell testing device also includes a bag and a second pressure plate, the second pressure plate and the first pressure plate are arranged parallel to each other, the bag is fixed on two opposite and adjacent surfaces of the first pressure plate and the second pressure plate, the pressure transmission medium is filled in the bag, and the bag of the second pressure plate is used to place the battery cell.

[0011] In one embodiment, the bag is a polymer sleeve, and the material of the polymer sleeve is para-aramid fiber or meta-aramid fiber.

[0012] In one embodiment, the pressure transmission medium includes silicone oil and / or solid particles, and the solid particles are micron-sized particles and / or nano-sized particles.

[0013] In one embodiment, the solid particles include thermally conductive ceramic particles.

[0014] In one embodiment, the battery cell testing device further comprises a test lead, one end of the test lead is used to connect to the battery cell, and the other end of the test lead is used to connect to a tester.

[0015] The beneficial effect of the utility model is that the pressure transmission medium at least evenly covers the two opposite surfaces of the battery cell. When the pressure-applying mechanism applies pressure to the battery cell through the pressure transmission medium, the pressure on the surface of the battery cell is uniform. This solves the problem that when a hard metal plate is pressed on an uneven surface of the battery cell, the pressure on different areas of the battery cell is not completely consistent, and the actual working pressure during the battery cell test is not equal to the set pressure, thereby improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a battery cell testing device according to an embodiment of the utility model;

[0018] Figure 2 It is a partial structural schematic diagram of a battery cell testing device according to another embodiment of the utility model;

[0019] Figure 3 It is a structural schematic diagram of a battery cell testing device according to another embodiment of the utility model.

[0020] In the figure: 1. test box; 2. pressure transmission medium; 3. pressure-applying mechanism; 31. first pressure plate; 311. pressure gauge; 312. first pressure relief valve; 32. cylinder; 33. second pressure plate; 34. hydraulic pump; 35. storage chamber; 36. pipeline; 361. flow regulating valve; 362. second pressure relief valve; 4. marking line; 5. bag; 6. test lead; 7. support structure; 8. battery cell. DETAILED DESCRIPTION

[0021] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0024] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0025] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0026] The utility model provides a battery core testing device, such as Figure 1As shown, it includes a test box 1, a pressure transmission medium 2 and a pressure mechanism 3. The pressure transmission medium 2 is located in the test box 1. When testing the battery cell, the battery cell 8 to be tested is placed in the test box 1. The pressure mechanism 3 applies pressure to the battery cell 8 through the pressure transmission medium 2. The pressure transmission medium 2 can at least evenly cover the two opposite surfaces of the battery cell 8, so that the two surfaces evenly covered with the pressure transmission medium 2 can be subjected to uniform pressure. In this embodiment, the pressure transmission medium 2 at least evenly covers the two opposite surfaces of the battery cell 8. When the pressure mechanism 3 applies pressure to the battery cell 8 through the pressure transmission medium 2, the pressure on the surface of the battery cell 8 is uniform, which solves the problem that when the hard metal plate is pressed on the uneven surface of the battery cell 8, the pressure on different areas of the battery cell 8 is not completely consistent, resulting in the actual working pressure of the battery cell 8 during the test not being equal to the set pressure, thereby improving the accuracy of the test results.

[0027] As an implementation mode, when the pressure-applying mechanism 3 applies pressure to the battery cell 8 through the pressure-transmitting medium 2, the pressure borne by various parts of the surface of the battery cell 8 is equal, so that the actual working pressure of the battery cell 8 during testing is equal to the set pressure, thereby improving the accuracy of the test results.

[0028] As an implementation method, Figure 1 As shown, the pressure transmission medium 2 is dispersed in the test box 1 , and when the battery cell 8 is placed in the test box 1 , the pressure transmission medium 2 is in direct contact with the battery cell 8 .

[0029] As an implementation method, Figure 1 As shown, a marking line 4 is provided in the test box 1 to mark the maximum filling amount of the pressure transmission medium 2 in the test box 1 to prevent the pressure transmission medium 2 from overflowing from the test box 1 when pressurized, thereby affecting normal testing.

[0030] As an implementation method, Figure 1 As shown, the pressure mechanism 3 includes a first pressure plate 31 and a cylinder 32. The output end (telescopic rod) of the cylinder 32 is connected to the first pressure plate 31. The cylinder 32 controls the first pressure plate 31 to apply pressure to the battery cell 8 through the pressure transmission medium 2. The first pressure plate 31 and the battery cell 8 are arranged parallel and opposite to each other to ensure that the first pressure plate 31 can apply pressure evenly when applying pressure to the battery cell 8. Of course, the cylinder 32 can also be replaced by a hydraulic cylinder or other motors.

[0031] As an implementation method, Figure 1 As shown, the pressure transmission medium 2 is silicone oil or a mixed slurry of silicone oil and solid particles, and when the pressure transmission medium 2 is dispersed in the test box 1, the test box 1 is a sealed box, and the first pressure plate 31 acts as a piston to apply hydraulic pressure to the sealed box. The first pressure plate 31 is provided with a pressure gauge 311 and a first pressure release valve 312 for regulating the pressure in the test box 1.

[0032] As an embodiment, when the pressure transmission medium 2 is solid particles and the pressure transmission medium 2 is dispersed in the test box 1, the test box 1 is a non-sealed box, and the first pressure plate 31 does not need to be provided with a pressure gauge 311 and a first pressure release valve 312. Figure 1 On this basis, the pressure gauge 311 and the first pressure relief valve 312 can be deleted accordingly.

[0033] like Figure 3 As shown, as another embodiment, the pressure mechanism 3 includes a hydraulic pump 34, a storage chamber 35 and a pipeline 36. The test box 1 is a sealed structure. The hydraulic pump 34 is connected to the storage chamber 35 and the test box 1 through the pipeline 36. The pressure medium 2 is installed in the storage chamber 35. The hydraulic pump 34 pumps the pressure medium 2 in the storage chamber 35 into the test box 1, so that the pressure medium 2 completely covers the battery cell 8. The pressure mechanism 3 can apply uniform pressure to the surface of the battery cell 8 through the pressure medium 2. The pipeline 36 is also provided with a flow regulating valve 361 and a second pressure release valve 362 for adjusting the pressure on the battery cell 8.

[0034] As an implementation method, Figure 2 As shown, the battery cell testing device also includes a bag 5 and a second pressing plate 33. The second pressing plate 33 and the first pressing plate 31 are arranged parallel to each other. The second pressing plate 33 can be directly fixed on a plane or connected to another cylinder. Bags 5 are fixed on the two opposite and adjacent surfaces of the first pressing plate 31 and the second pressing plate 33. The pressure transmission medium 2 is filled in the bag 5. The bag 5 of the second pressing plate 33 is used to place the battery cell 8. Among them, the bag 5 is a closed elastic object that can resist pressure. When the cylinder 32 controls the first pressing plate 31 to pressurize, the bag 5 of the first pressing plate 31 and the bag 5 of the second pressing plate 33 are fully in contact with the upper and lower surfaces of the battery cell 8, respectively, so that the pressure on each area of ​​the surface of the battery cell 8 is consistent when pressurized. Furthermore, the size of the second pressure plate 33 and the first pressure plate 31 is larger than the size of the battery cell 8, so that the battery cell 8 can be completely clamped between the second pressure plate 33 and the first pressure plate 31, avoiding the peripheral part of the battery cell 8 from being exposed outside the pressure plate and uneven force; and the bag 5 can completely cover the surface of the battery cell 8, so that the bag 5 is in full contact with the battery cell 8.

[0035] As an implementation mode, the bag 5 is a polymer sleeve, and the material of the polymer sleeve is para-aramid fiber or meta-aramid fiber. The polymer sleeve can adapt to the uneven surface of the battery cell 8 so that the pressure on each area of ​​the surface of the battery cell 8 is consistent.

[0036] As an embodiment, the pressure transmission medium 2 includes silicone oil and / or solid particles, and the solid particles are micron-sized particles and / or nano-sized particles. That is, the pressure transmission medium 2 may include silicone oil (or other non-conductive oil bodies) or solid particles or a mixed slurry of solid particles and silicone oil. The pressure transmission medium 2 may be directly dispersed in the test box, or the pressure transmission medium 2 may be placed in the bag 5; silicone oil, micron-sized particles, and nano-sized particles can well adapt to the uneven surface of the battery cell 8, and the uneven pressure can be adjusted by the mobility of the silicone oil and / or particles.

[0037] As an embodiment, the solid particles include thermally conductive ceramic particles, such as BeO, AlN, etc. Among them, the thermally conductive ceramic particles can effectively conduct the heat generated by the battery cell 8 during the cycle, dissipate the heat of the battery cell 8, ensure the uniform temperature of the battery cell 8, and make the actual test temperature of the battery cell 8 consistent with the test set temperature; silicone oil can also help the battery cell 8 to dissipate heat quickly and maintain uniform temperature. The solid particles are mixed with silicone oil to form a slurry with a high solid content. The slurry can form a good pressurized interface, so that the surface of the battery cell 8 is evenly pressurized, and at the same time has good thermal conductivity and heat dissipation effects, so that the temperature of the battery cell 8 is uniform.

[0038] As an implementation mode, the pressure range of the pressure applying mechanism 3 is 0.1 MPa to 50 MPa.

[0039] As an implementation method, Figure 1 As shown, the battery cell testing device also includes a test lead 6, one end of which is used to connect to the battery cell 8, and the other end of the test lead 6 is used to connect to a cycle tester (not shown). The test lead 6 passes through the side wall of the test box 1, and the end located inside the test box 1 is connected to the battery cell 8, and the end located outside the test box 1 is connected to the cycle tester, so as to achieve the connection between the cycle tester and the battery cell 8. When the pressure transmission medium 2 is directly filled in the test box 1, the connection between the test lead 6 and the test box 1 is sealed to prevent the pressure transmission medium 2 from leaking out at the position where the test lead 6 passes through the test box 1.

[0040] As an implementation method, Figure 1 As shown, the battery cell testing device also includes a support structure 7, the test box 1 is placed in the support structure 7, the cylinder 32 is installed on the support structure 7, and the support structure 7 supports the cylinder. In other embodiments, the support structure 7 can be a bracket or other supporting devices. When the battery cell 8 is placed in the test box 1, the output end (telescopic rod) of the cylinder 32 drives the first pressing plate 31 to move downward until the first pressing plate 31 contacts the battery cell 8 through the pressure transmission medium 2. During the process of continuing to move downward, the upper surface of the battery cell 8 is subjected to the applied pressure, and during the extrusion process, the lower surface of the battery cell 8 is also subjected to uniform pressure.

[0041] The beneficial effects of the utility model include:

[0042] 1. When the battery cell is tested, the surface is evenly stressed, which overcomes the problem of uneven pressure on the battery cell caused by the uneven surface of the battery cell 8.

[0043] 2. During the battery cell test, the actual working pressure is consistent with the set pressure, and the actual operating temperature is also consistent with the set temperature, ensuring the accuracy of the test results.

[0044] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A battery cell testing device, characterized in that: The invention comprises a test box (1), a pressure transmission medium (2) and a pressure applying mechanism (3); the pressure transmission medium (2) is located in the test box (1); when testing a battery cell, a battery cell (8) to be tested is placed in the test box (1); and the pressure applying mechanism (3) applies pressure to the battery cell (8) through the pressure transmission medium (2).

2. The battery cell testing device according to claim 1, characterized in that: When the pressure-applying mechanism (3) applies pressure to the battery core (8) through the pressure-transmitting medium (2), the pressure borne by various parts of the surface of the battery core (8) is equal.

3. The battery cell testing device according to claim 1, characterized in that: The pressure transmission medium (2) is dispersed in the test box (1), and when the battery cell (8) is placed in the test box (1), the pressure transmission medium (2) is in direct contact with the battery cell (8).

4. The battery cell testing device according to claim 3, characterized in that: A marking line (4) is provided in the test box (1) for marking the maximum filling amount of the pressure transmission medium (2) in the test box (1).

5. The battery cell testing device according to claim 1, characterized in that: The pressure-applying mechanism (3) comprises a first pressure plate (31) and a cylinder (32); the output end of the cylinder (32) is connected to the first pressure plate (31); and the first pressure plate (31) and the battery cell (8) are arranged parallel to each other.

6. The battery cell testing device according to claim 5, characterized in that: The battery cell testing device further comprises a bag (5) and a second pressing plate (33); the second pressing plate (33) and the first pressing plate (31) are arranged parallel to each other; the bag (5) is fixed on two opposite and adjacent surfaces of the first pressing plate (31) and the second pressing plate (33); the pressure transmission medium (2) is filled in the bag (5); and the bag (5) of the second pressing plate (33) is used for placing the battery cell (8).

7. The battery cell testing device according to claim 6, characterized in that: The bag (5) is a polymer sleeve, and the material of the polymer sleeve is para-aramid fiber or meta-aramid fiber.

8. The battery cell testing device according to claim 1, characterized in that: The pressure transmission medium (2) comprises silicone oil and / or solid particles, and the solid particles are micron-sized particles and / or nano-sized particles.

9. The battery cell testing device according to claim 8, characterized in that: The solid particles include thermally conductive ceramic particles.

10. The battery cell testing device according to any one of claims 1 to 9, characterized in that: The battery cell testing device further comprises a test lead (6), one end of the test lead (6) being used to be connected to the battery cell (8), and the other end of the test lead (6) being used to be connected to a tester.

Images