Cover plate assembly, battery cell and battery pack

Abstract

The utility model discloses a cover plate assembly, a battery cell and a battery pack, the cover plate assembly comprises a cover plate body, the cover plate body is provided with a mounting hole and a mounting part, and the mounting hole and the mounting part are spaced along a first direction of the cover plate body. Therefore, the cover plate body of the cover plate assembly is provided with the mounting hole in advance, the mounting hole does not influence the performance of the battery cell, when the battery cell test needs to be carried out, a test wire can be directly led out from the mounting hole, the cover plate body does not need to be additionally punched, the manufacturing period of the tested battery cell is greatly shortened, the test efficiency is improved, and meanwhile, the cost is reduced. And the installation part can limit and fix the led-out test wire, so that the risk that the test wire moves in the hole is reduced, and the fracture failure is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cover plates, in particular to a cover plate assembly, a battery core and a battery pack. Background Art

[0002] Currently, in battery research, it is usually necessary to test battery cells, so test wires need to be led out from the battery cells. In related technologies, when testing battery cells, additional holes need to be punched on the cover plate, which makes the production cycle longer and leads to low test efficiency. At the same time, the led-out test wires are not easy to fix and are prone to move back and forth in the hole, resulting in breakage and failure. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to propose a cover plate assembly, the cover plate body of the cover plate assembly is pre-equipped with a mounting hole, the mounting hole will not affect the performance of the battery cell, when the battery cell test is required, the test line can be directly led out from the mounting hole, without the need to make additional holes in the cover plate body, which greatly shortens the production cycle of the test battery cell and is conducive to improving the test efficiency. At the same time, the mounting part can also limit and fix the lead-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0004] The second purpose of the utility model is to provide a battery core.

[0005] The third objective of the present invention is to provide a battery pack.

[0006] To achieve the above-mentioned purpose, the first embodiment of the utility model provides a cover plate assembly, including:

[0007] The cover plate body has a mounting hole and a mounting portion, and along a first direction of the cover plate body, the mounting hole is spaced apart from the mounting portion.

[0008] According to the cover plate assembly of the embodiment of the utility model, the cover plate body of the cover plate assembly is pre-disposed with a mounting hole, and the mounting hole will not affect the performance of the battery cell. When the battery cell test is required, the test line can be directly led out from the mounting hole without the need for additional drilling of the cover plate body, which greatly shortens the production cycle of the test battery cell and is conducive to improving the test efficiency. At the same time, the mounting portion can also limit and fix the led-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0009] In some examples of the present invention, the mounting portion is configured as a mounting boss protruding toward a side away from the cover body, and a side wall of the mounting boss is provided with a mounting groove extending along a circumferential direction of the mounting boss.

[0010] In some examples of the utility model, it also includes: a protective member, the protective member includes a covering portion and a connecting portion, the covering portion and the connecting portion are connected, and the covering portion is used to cover the mounting hole and the mounting groove, and the connecting portion is fixedly connected to the mounting portion.

[0011] In some examples of the present invention, the connecting portion has a mounting groove, the mounting portion has a mounting protrusion, and the mounting groove and the mounting protrusion are assembled together so that the connecting portion is fixedly mounted on the mounting portion.

[0012] In some examples of the present invention, it further includes: an elastic member, which is fixed to the mounting hole, and has a through hole arranged corresponding to the mounting hole.

[0013] In some examples of the present invention, the elastic member is configured as a rubber plug.

[0014] In order to achieve the above-mentioned object, the second embodiment of the utility model provides a battery cell, comprising:

[0015] A cover plate assembly, which is the cover plate assembly in the embodiment of the first aspect;

[0016] The reference electrode is passed through the mounting hole and fixedly mounted on the cover body through the mounting portion.

[0017] In some examples of the present invention, there are multiple reference electrodes.

[0018] In some examples of the present invention, the reference electrode is configured as a metal copper wire.

[0019] According to the battery cell of the embodiment of the utility model, the above-mentioned cover plate assembly is provided, and the cover plate body of the cover plate assembly is pre-provided with a mounting hole, which will not affect the performance of the battery cell. When the battery cell test is required, the test line can be directly led out from the mounting hole without the need for additional drilling of the cover plate body, which greatly shortens the production cycle of the test battery cell and is conducive to improving the test efficiency. At the same time, the mounting portion can also limit and fix the led-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0020] In order to achieve the above-mentioned purpose, a third aspect of the present invention provides a battery pack, including the battery cell in the second aspect of the invention.

[0021] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery cells, the cover plate body of the cover plate assembly is pre-provided with a mounting hole, and the mounting hole will not affect the performance of the battery cell. When the battery cell test is required, the test line can be directly led out from the mounting hole without the need for additional punching of the cover plate body, which greatly shortens the production cycle of the test battery cell and is conducive to improving the test efficiency. At the same time, the mounting portion can also limit and fix the led-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic diagram of a cover plate assembly and a reference electrode according to an embodiment of the utility model;

[0025] Figure 2 It is an assembly diagram of a cover plate assembly according to one embodiment of the utility model;

[0026] Figure 3 It is a partial enlarged view of a cover plate body according to an embodiment of the utility model;

[0027] Figure 4 is a schematic diagram of a protective member according to an embodiment of the utility model;

[0028] Figure 5 The figure is a schematic diagram of assembling a mounting portion and a protective member according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] Cover plate assembly 100;

[0031] Cover plate body 1; mounting hole 11; mounting portion 12; mounting groove 121; mounting protrusion 122; pole 13;

[0032] Protective member 3; covering portion 31; connecting portion 32; mounting slot 321; mounting opening 33;

[0033] Elastic member 4;

[0034] Reference electrode 200;

[0035] The first direction X. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] The cap plate assembly 100, battery cell and battery pack provided in the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0038] like Figure 1-Figure 5 As shown, the cover assembly 100 according to the first embodiment of the utility model includes: a cover body 1, the cover body 1 has a mounting hole 11 and a mounting portion 12, and along the first direction X of the cover body 1, the mounting hole 11 is spaced apart from the mounting portion 12.

[0039] It should be noted that, in the embodiment of the present disclosure, the cover plate assembly 100 is applied to the battery cell, wherein the battery cell can be a cylindrical battery cell or a blade battery cell, and no specific limitation is made here. When the battery cell is a cylindrical battery cell, the positive electrode column and the negative electrode column of the battery cell can be arranged on the same cover plate or on different cover plates. When the battery cell is a blade battery cell, the blade battery cell is provided with a positive cover plate and a negative cover plate according to the characteristics of the blade battery cell itself. Since the positive cover plate and the negative cover plate are located on opposite sides of the battery cell, the positive electrode column and the negative electrode column of the blade battery cell are respectively arranged on the positive cover plate and the negative cover plate.

[0040] Specifically, the present application is described using a blade battery cell as an example, wherein the cover plate assembly 100 may be a positive electrode cover plate assembly 100 or a negative electrode cover plate assembly 100, and no specific limitation is given here. Further, taking the three-electrode test of the battery cell as an example, when performing the battery cell test, it is necessary to lead out a test line from the inside of the battery cell, such as a reference electrode 200, wherein the reference electrode 200 is electrically connected to the electrolyte inside the battery cell, thereby providing a reference voltage for the three-electrode test of the battery cell. Further, taking the cover plate assembly 100 as an example of a negative electrode cover plate assembly 100, such as Figure 1 As shown, the negative electrode cover body is provided with a mounting hole 11 and a mounting portion 12, wherein the mounting portion 12 is located outside the battery cover body 1, and along the first direction X of the cover body 1, the mounting hole 11 is spaced apart from the mounting portion 12. When a battery cell three-electrode test is required, since the mounting hole 11 of the cover body 1 can be pre-processed and mass-produced before assembly, the reference electrode 200 can be directly led out from the mounting hole 11 during the battery cell three-electrode assembly process, and there is no need to perform additional drilling on the cover body 1 during the three-electrode test, which is beneficial to improving the test efficiency. At the same time, After the reference electrode 200 is led out from the mounting hole 11, the mounting hole 11 can be sealed so as not to affect the normal use of the battery cell. That is to say, the preset mounting hole 11 will not affect the performance of the battery cell. Furthermore, the reference electrode 200 is led out from the mounting hole 11 and assembled with the mounting portion 12, so that the reference electrode 200 is fixedly mounted on the cover body 1 through the mounting portion 12, so that the reference electrode 200 can be limited and fixed, reducing the risk of the reference electrode 200 moving, and can play a certain protective role in protecting the reference electrode 200 to prevent it from breaking and failing.

[0041] It is understandable that if Figure 1As shown, a pole 13 is provided on the cover body 1. In order to prevent the reference electrode 200 from being electrically connected to the pole 13, an insulating member is wrapped around the outside of the reference electrode 200. That is, the reference electrode 200 fixedly mounted on the mounting portion 12 is insulated from the pole 13 by the insulating member.

[0042] According to the cover plate assembly 100 of the embodiment of the utility model, the cover plate body 1 of the cover plate assembly 100 is pre-disposed with a mounting hole 11, and the mounting hole 11 will not affect the performance of the battery cell. When the battery cell test is required, the test line can be directly led out from the mounting hole 11 without the need for additional drilling of the cover plate body 1, which greatly shortens the production cycle of the test battery cell and is beneficial to improving the test efficiency. At the same time, the mounting portion 12 can also limit and fix the led-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0043] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the mounting portion 12 is constructed as a mounting boss protruding toward a side away from the cover body 1 , and a mounting groove 121 is provided on a side wall of the mounting boss, and the mounting groove 121 extends along the circumferential direction of the mounting boss.

[0044] Specifically, the mounting boss protrudes toward the side away from the cover body 1, and the side wall of the mounting boss is provided with a mounting groove 121, which is recessed toward the mounting boss, and the mounting groove 121 extends along the circumferential direction of the mounting boss, that is, the mounting groove 121 is annular and recessed toward the side wall of the mounting boss. For example, when assembling a three-electrode battery cell, the reference electrode 200 is constructed as a metal copper wire wrapped with an insulating member on the outside, and the reference electrode 200 is led out from the mounting hole 11 and wound in the mounting groove 121 of the mounting boss. The winding direction The installation can be in a clockwise or counterclockwise manner, and there is no specific limitation here. It should be noted that the groove width and groove depth of the installation groove 121 are both larger than the diameter of the reference electrode 200. In this way, the winding assembly of the reference electrode 200 and the installation groove 121 simplifies the assembly method of the reference electrode 200 and the mounting portion 12, and the installation and disassembly are more convenient. When three-electrode testing is required, the reference electrode 200 can be wound out of the installation groove 121 in the opposite direction, which greatly simplifies the three-electrode testing process of the battery cell.

[0045] It should be noted that the side wall of the mounting boss can adopt an arc design. When the reference electrode 200 is fixedly installed in the mounting groove 121 of the side wall of the mounting boss, the large-angle bending of the metal copper wire can be reduced, thereby reducing the risk of the metal copper wire breaking and improving the success rate of the three-electrode production.

[0046] In some embodiments of the present invention, Figure 4As shown, it also includes: a protective member 3, the protective member 3 includes a covering portion 31 and a connecting portion 32, the covering portion 31 and the connecting portion 32 are connected, and the covering portion 31 is used to cover the mounting hole 11 and the mounting groove 121, and the connecting portion 32 is fixedly connected to the mounting portion 12.

[0047] Specifically, Figure 1 As shown, the cover assembly 100 also includes a protective member 3. The material of the protective member 3 can be but is not limited to plastic, metal, etc. The protective member 3 is assembled with the cover body 1 so that the protective member 3 is fixedly installed on the cover body 1. The fixed installation method includes but is not limited to bolt connection, clamping, etc. The protective member 3 is also used to cover the mounting hole 11 and the mounting groove 121, so as to cover the reference electrode 200 exposed to the outside. It can be understood that the reference electrode 200 is led out from the mounting hole 11 of the cover body 1 and then fixedly installed on the mounting portion 12 of the cover body 1. Therefore, the protective member 3 needs to cover and protect the reference electrode 200 led out from the mounting hole 11 and the reference electrode 200 fixedly installed on the mounting portion 12. Such a setting can prevent the reference electrode 200 from touching the outside during the production of the battery cell, and plays a role in protecting and isolating the reference electrode 200, reducing the risk of damage to the reference electrode 200, and improving the manufacturing yield of the three-electrode battery cell. Furthermore, when it is necessary to perform a three-electrode test on the battery cell, remove the protective piece 3 to connect the reference electrode 200 to the measuring instrument, and then connect the positive and negative poles of the battery cell to the measuring instrument, thereby realizing the three-electrode test of the battery cell. The measurement method is simple and convenient, which greatly improves the test efficiency of the battery cell to be tested.

[0048] Furthermore, the protective member 3 can be an integrally formed member or a detachable member. The protective member 3 is composed of a covering portion 31 and a connecting portion 32. The covering portion 31 is fixedly connected to the connecting portion 32. Specifically, the covering portion 31 includes a first sub-covering portion for covering the mounting hole 11, and also includes a second sub-covering portion for covering the mounting groove 121. The first sub-covering portion can be constructed as a covering sheet, and the covering sheet is relative to the mounting hole 11 so as to cover the reference electrode 200 led out from the mounting hole 11. When the reference electrode 200 is fixedly mounted on the mounting boss in a manner of being wound in the mounting groove 121, the second sub-covering portion can be constructed as a covering plate opposite to the side wall of the mounting boss, so that the reference electrode 200 in the mounting groove 121 can be covered by the covering plate, thereby achieving isolation protection for the reference electrode 200.

[0049] Furthermore, the protective member 3 is fixedly connected to the mounting portion 12 of the cover body 1 through the connecting portion 32. For example, the connecting portion 32 and the mounting portion 12 of the cover body 1 may be provided with relatively arranged threaded holes, and the connecting portion 32 and the cover body 1 are fixedly connected by fasteners such as bolts, or the connecting portion 32 is provided with a bonding area, and the connecting portion 32 is fixedly mounted on the mounting portion 12 of the cover body 1 by bonding. Of course, the present application also has other connection methods, which will not be repeated here.

[0050] It should be noted that the reference electrode 200 can be well fixed on the cover body 1 through the mounting portion 12 of the cover body 1. At the same time, the protective member 3 can well isolate and protect the reference electrode 200 to ensure that the reference electrode 200 does not interfere with external tooling during the battery cell assembly process, which is conducive to realizing the automation of the battery pack production process. After the three-electrode battery cell is assembled, it can flow normally together with the normal battery cell. In subsequent processes such as liquid injection, formation, helium inspection, etc., there is no interference between the reference electrode 200 and the tooling, so no manual intervention is required, which can greatly improve the yield and production efficiency.

[0051] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the connecting portion 32 has a mounting slot 321 , and the mounting portion 12 has a mounting protrusion 122 . The mounting slot 321 and the mounting protrusion 122 are assembled together so that the connecting portion 32 is fixedly mounted on the mounting portion 12 .

[0052] Specifically, the mounting portion 12 is configured as a mounting boss, and the side wall of the mounting boss is provided with a mounting groove 121 as an example for explanation. Since the mounting groove 121 is annular and recessed toward the side wall of the mounting boss, an annular mounting protrusion 122 is formed between the mounting boss and the annular mounting groove 121, and the connecting portion 32 is provided with a mounting slide groove 321 that is assembled with the mounting protrusion 122. It can be understood that the protective member 3 has a mounting opening 33, and the size of the mounting opening 33 is adapted to the size of the mounting boss. Figure 1 and Figure 2 As shown, when the protective member 3 is assembled with the cover body 1, the mounting opening 33 of the protective member 3 is aligned with the mounting portion 12, and then the protective member 3 is moved toward the mounting portion 12 so that the mounting protrusion 122 of the mounting portion 12 is inserted into the mounting groove 321 of the protective member 3, and the protective member 3 is continued to be pushed so that the mounting protrusion 122 and the mounting groove 321 slide relative to each other until the protective member 3 covers all exposed reference electrodes 200, thereby achieving both a fixed connection between the connecting portion 32 and the mounting portion 12 and isolation protection for the reference electrode 200, and the protective member 3 can be installed and removed by pushing the protective member 3, which is convenient for installation and removal, and helps to further simplify the test process.

[0053] In some embodiments of the present invention, Figure 1 As shown, it also includes: an elastic member 4, the elastic member 4 is fixedly arranged in the mounting hole 11, and the elastic member 4 has a through hole arranged corresponding to the mounting hole 11. Specifically, the elastic member 4 is fixedly installed in the mounting hole 11, and the elastic member 4 has a through hole arranged corresponding to the mounting hole 11. In this way, when the three-electrode battery cell is assembled, the reference electrode 200 is led out from the elastic member 4 to be fixedly installed on the mounting portion 12 of the cover body 1, thereby avoiding direct contact and friction between the insulating member wrapped outside the reference electrode 200 and the mounting hole 11 of the cover body 1, thereby avoiding the insulation failure caused by wear and tear of the insulating member. It should be noted that after the elastic member 4 is fixedly installed in the mounting hole 11, the mounting hole 11 can be filled with high-temperature resistant AB glue. The high-temperature resistant AB glue plays a sealing role. The use of high-temperature resistant AB glue is to prevent cracking and warping during baking, which leads to sealing failure and leakage.

[0054] In some embodiments of the present invention, the elastic member 4 is configured as a rubber plug. That is, the elastic member 4 can be a rubber plug or other elastic materials, which are not specifically limited here. The rubber plug is cheap and easy to produce, which helps to save the production cost of the cover assembly 100.

[0055] According to the second aspect of the present invention, the battery cell includes: a cover plate assembly 100 and a reference electrode 200. The cover plate assembly 100 is the cover plate assembly 100 in the first aspect of the present invention. The reference electrode 200 is passed through the mounting hole 11 of the cover plate assembly 100 and is fixedly mounted on the cover plate body 1 through the mounting portion 12.

[0056] Specifically, the reference electrode 200 is electrically connected to the electrolyte inside the battery cell to provide a reference voltage for the three-electrode test. Figure 1As shown, in order to prevent the reference electrode 200 from being conductive with the pole 13, the reference electrode 200 is wrapped with an insulating member to insulate the reference electrode 200 from the pole 13. Since the mounting hole 11 of the cover body 1 can be pre-processed and mass-produced before assembly, the reference electrode 200 can be directly led out from the mounting hole 11 during the assembly of the three electrodes of the battery cell, and there is no need to perform additional drilling on the cover body 1 during the three-electrode test, which greatly reduces the production cycle of the three electrodes of the battery cell and is conducive to improving the test efficiency. At the same time, the reference electrode 200 After being led out from the mounting hole 11, the mounting hole 11 can also be sealed so as not to affect the normal use of the battery cell. That is to say, the preset mounting hole 11 will not affect the performance of the battery cell. Furthermore, the reference electrode 200 is led out from the mounting hole 11 and assembled with the mounting portion 12, so that the reference electrode 200 is fixedly installed on the cover body 1 through the mounting portion 12, so that the reference electrode 200 can be limited and fixed, reducing the risk of the reference electrode 200 moving, and can play a certain protective role in protecting the reference electrode 200 to prevent it from breaking and failing.

[0057] According to the battery cell of the embodiment of the utility model, the above-mentioned cover plate assembly 100 is provided, and the cover plate body 1 of the cover plate assembly 100 is pre-provided with a mounting hole 11, and the mounting hole 11 will not affect the performance of the battery cell. When the battery cell test is required, the test line can be directly led out from the mounting hole 11, and there is no need to perform additional drilling on the cover plate body 1, which greatly shortens the production cycle of the test battery cell and is beneficial to improving the test efficiency. At the same time, the mounting portion 12 can also limit and fix the led-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0058] In some embodiments of the utility model, there are multiple reference electrodes 200. That is to say, multiple reference electrodes 200 can be set to perform three-electrode testing. Specifically, each reference electrode 200 is led out from the mounting hole 11 and fixedly mounted on the mounting portion 12 of the cover body 1. The protective member 3 is fixedly mounted on the cover body 1 and covers and protects the multiple reference electrodes 200. Furthermore, one end of each reference electrode 200 can be rooted in different positions of the electrolyte inside the battery cell, thereby realizing the measurement of the reference potential at different positions of the battery cell, that is, realizing three-electrode testing with different reference potentials, which is conducive to improving the accuracy of the three-electrode testing of the battery cell.

[0059] In some embodiments of the present invention, the reference electrode 200 is constructed as a metal copper wire. That is, the reference electrode 200 can be a metal copper wire. In some embodiments of the present application, taking a blade battery as an example, a 50um, 20um or even thinner metal copper wire can be used to achieve lithium plating. Since the thin copper wire has a larger specific surface area, the lithium plating process is easier, and the capacity loss is small. Lithium deposition is not easy to occur around the metal copper wire, which ensures the stability and measurement accuracy of the reference electrode 200.

[0060] The battery pack according to the embodiment of the third aspect of the utility model includes the battery cell in the embodiment of the second aspect.

[0061] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery cells, the cover body 1 of the cover assembly 100 is pre-provided with a mounting hole 11, and the mounting hole 11 will not affect the performance of the battery cell. When the battery cell test is required, the test line can be directly led out from the mounting hole 11 without the need for additional punching of the cover body 1, which greatly shortens the production cycle of the test battery cell and is beneficial to improving the test efficiency. At the same time, the mounting portion 12 can also limit and fix the led-out test line, reducing the risk of its movement in the hole and preventing breakage and failure.

[0062] 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 an indirect connection 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 this utility model can be understood according to specific circumstances.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that: include: A cover body, the cover body having a mounting hole and a mounting portion, and along a first direction of the cover body, the mounting hole is spaced apart from the mounting portion; It also includes an elastic member, which is fixed to the mounting hole and has a through hole corresponding to the mounting hole.

2. The cover plate assembly according to claim 1, characterized in that: The mounting portion is configured as a mounting boss protruding toward a side away from the cover plate body, and a mounting groove is provided on a side wall of the mounting boss, and the mounting groove extends along a circumferential direction of the mounting boss.

3. The cover plate assembly according to claim 2, characterized in that: Also includes: The protective member includes a covering portion and a connecting portion, wherein the covering portion is connected to the connecting portion and is used to cover the mounting hole and the mounting groove, and the connecting portion is fixedly connected to the mounting portion.

4. The cover plate assembly according to claim 3, characterized in that: The connecting portion has a mounting slot, and the mounting portion has a mounting protrusion. The mounting slot is matched and assembled with the mounting protrusion so that the connecting portion is fixedly mounted on the mounting portion.

5. The cover plate assembly according to claim 1, characterized in that: The elastic member is configured as a rubber plug.

6. A battery cell, characterized in that: include: A cover plate assembly, wherein the cover plate assembly is the cover plate assembly according to any one of claims 1 to 5; A reference electrode is passed through the mounting hole and fixedly mounted on the cover body through the mounting portion.

7. The battery cell according to claim 6, characterized in that: The number of the reference electrodes is multiple.

8. The battery cell according to claim 6, characterized in that: The reference electrode is configured as a metal copper wire.

9. A battery pack, characterized in that: Comprising a battery cell according to any one of claims 6-8.

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