Battery cell cover plate, battery cell and battery

Abstract

The utility model discloses a battery cell cover plate, a battery cell and a battery, and belongs to the technical field of batteries. The battery cell cover plate comprises a substrate, a first plastic part and an electrode assembly, the substrate is provided with a first mounting hole. The upper surface of the first plastic part abuts against the lower surface of the substrate, and the first plastic part is provided with a second mounting hole. The electrode assembly comprises a pressing ring, a second plastic part and a pole, the pressing ring is clamped on the second plastic part, the second plastic part is clamped on the substrate, the pressing ring and the second plastic part are respectively provided with a third mounting hole and a fourth mounting hole, and the first mounting hole, the second mounting hole, the third mounting hole and the fourth mounting hole are in one-to-one correspondence and are communicated. At least one part of the pole sequentially penetrates through the second mounting hole, the first mounting hole, the fourth mounting hole and the third mounting hole, and the circumferential direction of the top end of the pole is welded with the hole wall of the third mounting hole. And the production efficiency of the battery cell cover plate can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery cell cover plate, a battery cell and a battery. BACKGROUND

[0002] A battery cell is a core component of a battery, commonly known as a battery monomer or battery chip, and is a basic unit of energy conversion in a battery system. The main function of the battery cell is to store and release electrical energy through chemical reactions, and its performance directly affects the overall performance and service life of the battery. Battery cells include square battery cells, cylindrical battery cells and the like. The battery cell cover plate, as an important component of the square battery cell, can seal, insulate, conduct electricity, relieve pressure and prevent explosion. The structure of the battery cell cover plate is relatively complex, resulting in low production efficiency of the battery cell cover plate. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the application provides a battery cell cover plate capable of improving the production efficiency of the battery cell cover plate.

[0004] In one aspect, the application provides a battery cell cover plate, which comprises a substrate, a first plastic part and an electrode assembly.

[0005] The substrate is provided with a first mounting hole;

[0006] The upper surface of the first plastic part is in abutment with the lower surface of the substrate, and the first plastic part is provided with a second mounting hole;

[0007] The electrode assembly comprises a compression ring, a second plastic part and a pole, the compression ring is connected to the second plastic part, the second plastic part is connected to the substrate, and the compression ring and the second plastic part are respectively provided with a third mounting hole and a fourth mounting hole, wherein the first mounting hole, the second mounting hole, the third mounting hole and the fourth mounting hole are one-to-one corresponding and communicated;

[0008] At least a part of the pole passes through the second mounting hole, the first mounting hole, the fourth mounting hole and the third mounting hole in sequence, and the circumferential surface of the top end of the pole is welded to the hole wall of the third mounting hole.

[0009] Optionally, the side wall of the compression ring is connected with at least two lugs;

[0010] The second plastic part has a groove, the groove bottom is provided with the fourth mounting hole, and the groove wall is outwardly protruding to form a clamping groove corresponding to the lug, and the lug is located in the corresponding clamping groove.

[0011] Optionally, the lug is provided with a positioning groove with an opening facing the second plastic part;

[0012] The bottom of the card slot is connected with a positioning block, the positioning block is clamped into the corresponding positioning slot, wherein the thickness of the positioning block is less than the thickness of the positioning slot.

[0013] Optionally, the part of the compression ring around the third mounting hole is stepped, the compression ring comprises a first step surface and a second step surface, the first step surface is higher than the second step surface, the first step surface is used to be connected with the bus bar, and the top surface of the pole column is flush with the second step surface.

[0014] Optionally, the electrode assembly further comprises a sealing member;

[0015] The pole column comprises a body member and a boss member on the top surface of the body member, the outer side wall of the boss member abuts against the inner wall of the third mounting hole, the sealing member is sleeved on the body member, and the outer side wall of the sealing member abuts against the inner wall of the first mounting hole.

[0016] Optionally, the bottom of the sealing member has a first flange in the circumferential direction, and the first flange extends away from the axial direction of the sealing member;

[0017] The bottom of the body member has a second flange in the circumferential direction, and the second flange extends away from the axial direction of the body member;

[0018] The diameter of the second mounting hole is greater than that of the first mounting hole, a part of the upper surface of the second flange abuts against the lower surface of the first plastic member, and the first flange is clamped between the substrate and the second flange.

[0019] Optionally, the bottom end of the fourth mounting hole is provided with a chamfer in the circumferential direction, and the chamfer abuts against the top end of the sealing member.

[0020] Optionally, the lower surface of the body member has a recess, and the recess is recessed towards the compression ring.

[0021] The circumferential side of the body member has a notch.

[0022] In another aspect, the embodiments of the present application also provide an electric core, which comprises a roll core, a shell and the electric core cover plate in any one of the embodiments of the present application.

[0023] The shell and the electric core cover plate are buckled together to form a containing cavity.

[0024] The roll core is located in the containing cavity, the roll core comprises a main body member and at least one pole lug, the pole lug is located on the top surface of the main body member and is welded with the bottom surface of the electric core cover plate.

[0025] In another aspect, the application also provides a battery comprising the cell cover plate according to any one of the application embodiments described above, or the battery comprising the cell according to the application embodiments described above.

[0026] The cell cover plate provided by the application embodiments comprises a substrate, a first plastic part and an electrode assembly. The electrode assembly comprises a compression ring, a second plastic part and a pole, and the compression ring and the second plastic part can be clamped together, and the second plastic part can be clamped on the substrate, so that the flexibility and efficiency of the assembly of the electrode assembly can be improved. Meanwhile, the pole can sequentially penetrate through the second mounting hole of the first plastic part, the first mounting hole of the substrate, the fourth mounting hole of the second plastic part and the third mounting hole of the compression ring, and the periphery of the top end of the pole can be welded with the hole wall of the third mounting hole, so as to complete the assembly of the cell cover plate. Since the composition structure and the assembly mode of the cell cover plate provided by the application embodiments are relatively simple, the production efficiency of the cell cover plate can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the application embodiments, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some of the application embodiments, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a structural schematic diagram and an explosion diagram of a cell cover plate provided by the application embodiments;

[0029] Figure 2 is a sectional view schematic diagram and a local enlarged view of a cell cover plate provided by the application embodiments;

[0030] Figure 3 is a structural schematic diagram of a compression ring in a cell cover plate provided by the application embodiments;

[0031] Figure 4 is a sectional view schematic diagram of a compression ring in a cell cover plate provided by the application embodiments;

[0032] Figure 5 is a structural schematic diagram of a second plastic part in a cell cover plate provided by the application embodiments;

[0033] Figure 6 is a sectional view schematic diagram of a second plastic part in a cell cover plate provided by the application embodiments;

[0034] Figure 7 is a sectional view schematic diagram of a pole in a cell cover plate provided by the application embodiments;

[0035] Figure 8This is a cross-sectional schematic diagram of a battery cell provided in an embodiment of this application.

[0036] Figure label:

[0037] 100, substrate; 110, first mounting hole; 120, mounting groove;

[0038] 200, First plastic part; 210, Second mounting hole;

[0039] 300. Electrode assembly; 310. Pressure ring; 320. Second plastic part; 330. Electrode post; 340. Seal; 311. Third mounting hole; 312. Lug; 313. First stepped surface; 314. Second stepped surface; 321. Fourth mounting hole; 322. Groove; 323. Slot; 331. Body part; 332. Boss part; 341. First flange; 3121. Positioning groove; 3211. Chamfer; 3231. Positioning block; 3311. Second flange; 3312. Recess; 3313. Notch;

[0040] 340. Sealing element; 341. First flange;

[0041] 400. Core; 410. Main body; 420. Electrode tab; 430. Protective sheet.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1 The relative positions shown are based on established rules, and these directional terms are used merely to more clearly describe the structures and their relationships, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged. Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art.

[0045] In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0046] In combination with Figure 1 and Figure 2 It is shown that the embodiments of the present application provide a battery cell cover plate, which comprises a substrate 100, a first plastic part 200 and an electrode assembly 300. It should be noted that the battery cell cover plate in the embodiments of the present application can comprise two groups of electrode assemblies 300, one group being a positive electrode assembly and the other group being a negative electrode assembly. The positive electrode assembly and the negative electrode assembly are symmetrically arranged, and the structure and mounting mode of the positive electrode assembly and the negative electrode assembly are the same. The embodiments of the present application only take one group of electrode assemblies 300 as an example for description. The first plastic part 200 can play an insulating and supporting role, and can also fix the roll core 400.

[0047] The substrate 100 is provided with a first mounting hole 110. The upper surface of the first plastic part 200 abuts against the lower surface of the substrate 100, and the first plastic part 200 is provided with a second mounting hole 210.

[0048] The electrode assembly 300 comprises a compression ring 310, a second plastic part 320 and a pole 330. The compression ring 310 is clamped on the second plastic part 320, and the second plastic part 320 is clamped on the base plate 100. It should be noted that the second plastic part 320 can be made of a fully insulating material, and the insulation resistance value can be, for example, not less than 200 MΩ. Alternatively, the second plastic part 320 can be made of an insulating material and conductive particles, and used as a whole weak conductor, for example, with a weak conductive resistance value ranging between 50 Ω and 20,000 Ω. The second plastic part 320 in the positive electrode assembly and the second plastic part 320 in the negative electrode assembly can be set to different colors for differentiation, facilitating assembly. The second plastic part 320 can be made of polyphenylene sulfide or polyimide material, thereby reducing the thickness change of the second plastic part 320 caused by welding heat. The clamping method is used for positioning and assembling each structure, which can improve the flexibility and efficiency of the assembly of the electrode assembly 300. The compression ring 310 and the second plastic part 320 are respectively provided with a third mounting hole 311 and a fourth mounting hole 321. The first mounting hole 110, the second mounting hole 210, the third mounting hole 311 and the fourth mounting hole 321 are in one-to-one correspondence and communication. At least a part of the pole 330 penetrates the second mounting hole 210, the first mounting hole 110, the fourth mounting hole 321 and the third mounting hole 311 in sequence, and the circumferential surface of the top end of the pole 330 is welded to the hole wall of the third mounting hole 311. Since the pole 330 only needs to penetrate the mounting holes in sequence and be welded to the compression ring 310, the composition and assembly method of the battery cell cover plate are relatively simple, thereby improving the production efficiency of the battery cell cover plate. It should be noted that the circumferential surface of the top end of the pole 330 and the hole wall of the third mounting hole 311 can be fixed by laser welding. The first mounting hole 110, the second mounting hole 210, the third mounting hole 311 and the fourth mounting hole 321 are coaxially arranged.

[0049] As shown in Figure 1 some embodiments, the base plate 100 has a mounting groove 120 with an opening facing the compression ring 310, and the groove bottom of the mounting groove 120 is provided with a first mounting hole 110. The second plastic part 320 is clamped into the corresponding mounting groove 120. It should be understood that by providing the mounting groove 120, the second plastic part 320 can be positioned and installed, improving the assembly efficiency of the battery cell cover plate.

[0050] The details and effects of the battery cell cover plate provided by the embodiments of the present application will be described in more detail. Figures 1 to 8 The details and effects of the battery cell cover plate provided by the embodiments of the present application will be described in more detail.

[0051] In combination with Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, in some embodiments, the side wall of the compression ring 310 is connected with at least two lugs 312. The second plastic part 320 has a groove 322, the groove bottom of the groove 322 is provided with a fourth mounting hole 321, the groove wall of the groove 322 protrudes outward to form a clamping groove 323 corresponding to the lug 312, and the lug 312 is located in the corresponding clamping groove 323. It should be understood that the lug 312 cannot rotate in the circumferential direction due to the limitation of the clamping groove 323, so that the compression ring 310 cannot rotate in the circumferential direction, thereby improving the torque resistance of the compression ring 310, and further improving the torque resistance of the pole column 330 welded with the compression ring 310. It should be noted that when there are two lugs 312, the two lugs 312 can be symmetrically arranged on both sides of the compression ring 310. When there are multiple lugs 312, the multiple lugs 312 can be uniformly distributed on the circumferential side of the compression ring 310. The shape of the lug 312 can be, for example, wedge-shaped, polygonal, hemispherical, etc.

[0052] In combination Figures 3 to 6 As shown, in some embodiments, the lug 312 is provided with a positioning groove 3121 opening towards the second plastic part 320. The groove bottom of the clamping groove 323 is connected with a positioning block 3231 clamped into the corresponding positioning groove 3121. It should be noted that the clamping cooperation of the positioning groove 3121 and the positioning block 3231 improves the convenience of assembling the compression ring 310 and the second plastic part 320, and further improves the torque resistance of the compression ring 310, that is, the torque resistance of the pole column 330. The thickness of the positioning block 3231 is less than the thickness of the positioning groove 3121, so as to prevent the positioning block 3231 from being separated from the positioning groove 3121, ensure the clamping reliability of the positioning block 3231 and the positioning groove 3121, and further improve the torque resistance of the compression ring 310 and the pole column 330. In the thickness direction, the thickness difference between the positioning groove 3121 and the positioning block 3231 can be between 0.2mm and 1mm. It should be noted that the shape of the positioning groove 3121 can be, for example, rectangular, cylindrical, spherical, frustoconical, etc., and the shape of the positioning block 3231 matches the shape of the positioning groove 3121. The positioning groove 3121 can be arranged at the middle position of the lug 312. The groove wall thickness of the positioning groove 3121 can be, for example, 0.5mm to 2mm.

[0053] In combination Figures 1 to 4As shown, in some embodiments, the portion of the pressure ring 310 surrounding the third mounting hole 311 is stepped. The pressure ring 310 includes a first stepped surface 313 and a second stepped surface 314. The first stepped surface 313 is higher than the second stepped surface 314. The first stepped surface 313 is used to connect to the busbar, and the top surface of the pole post 330 is flush with the second stepped surface 314. It should be noted that the area formed by the height difference between the first stepped surface 313 and the second stepped surface 314 can be used to accommodate the solder used for welding the pole post 330 and the pressure ring 310, thereby ensuring stable welding between the pole post 330 and the pressure ring 310 while avoiding interference with the welding of the busbar. The first stepped surface 313 can be 0.2 mm to 1.5 mm higher than the second stepped surface 314.

[0054] Combination Figure 1 and Figure 2 As shown, in some embodiments, the electrode assembly 300 further includes a sealing element 340. The electrode post 330 includes a body part 331 and a boss part 332 located on the top surface of the body part 331. The outer wall of the boss part 332 abuts against the inner wall of the third mounting hole 311. The sealing element 340 is sleeved on the body part 331, and the outer wall of the sealing element 340 abuts against the inner wall of the first mounting hole 110. It should be noted that the body part 331 and the boss part 332 can be an integrally formed structure, for example, made of copper-aluminum composite material; or the body part 331 and the boss part 332 can be friction-welded together, for example, the boss part 332 can be made of aluminum and the body part 331 can be made of copper. This reduces the amount of pure copper used, lowers costs, and reduces the weight of the electrode post 330. By providing the sealing element 340, the sealing performance of the cell cover can be improved. In some embodiments, the portion of the top surface of the body 331 without the protrusion 332 abuts against the bottom surface of the pressure ring 310, thereby providing a current path and improving the current carrying capacity of the terminal.

[0055] like Figure 2 and Figure 7 As shown, in some embodiments, the bottom of the seal 340 has a first flange 341 along the circumferential direction, and the first flange 341 extends away from the axial direction of the seal 340. The bottom of the body 331 has a second flange 3311 along the circumferential direction, and the second flange 3311 extends away from the axial direction of the body 331. The diameter of the second mounting hole 210 is larger than the diameter of the first mounting hole 110, and a portion of the upper surface of the second flange 3311 abuts against the lower surface of the first plastic part 200. The first flange 341 is sandwiched between the substrate 100 and the second flange 3311. This arrangement can improve the sealing performance between the electrode post 330, the pressure ring 310, and the first plastic part 200, thereby improving the sealing capability of the cell cover. The thickness of the second flange 3311 is not higher than 2 mm, and the outline of the second flange 3311 can be circular, rectangular, polygonal, or other shapes.

[0056] likeFigure 6 As shown, in some embodiments, the bottom end of the fourth mounting hole 321 is provided with a chamfer 3211 along the circumference, and the chamfer 3211 abuts against the top end of the seal 340. This arrangement can improve the sealing capability of the electrode post 330, prevent electrolyte overflow from causing electrolyte to flow into the electrode post 330, thereby avoiding the risk of insulation failure of the cell cover. It should be noted that after the seal 340 is assembled, the top end of the seal 340 is compressed by the chamfer 3211, thereby ensuring the sealing performance of the electrode post 330.

[0057] like Figure 7 As shown, in some embodiments, the lower surface of the body component 331 has a recess 3312 that is recessed toward the pressure ring 310. The circumferential side of the body component 331 has a notch 3313. This design ensures that the electrode post 330 has good mechanical and electrical properties while minimizing its weight and material usage, thus achieving weight reduction. In this embodiment, the notch 3313 of the body component 331 can be, for example, semi-circular, rectangular, or polygonal. It should be noted that the notch 3313 is located in the portion of the electrode post 330 that does not need to be connected to the tab 420, thereby reducing the weight of the electrode post 330 while ensuring the reliability of the connection between the electrode post 330 and the tab 420. The recess 3312 can be formed by sheet metal stamping or machining. The thickness of the portion of the electrode post 330 corresponding to the recess 3312 is not less than 3mm, ensuring that it does not affect the welding or mechanical properties of the electrode post 330.

[0058] In summary, the electrode post 330 in the battery cell cover provided in this application adopts a recess 3312 and a notch 3313 design, which ensures both the mechanical and electrical properties of the electrode post 330 and also makes the electrode post 330 lighter. After passing through the corresponding mounting hole, the electrode post 330 is directly fixed to the pressure plate by welding, thereby reducing the manufacturing process of the cover and improving the production efficiency of the cover. At the same time, the cooperation between the slot 323 and the lug 312, and the cooperation between the positioning slot 3121 and the positioning block 3231, can improve the torque resistance of the pressure ring 310, that is, improve the torque resistance of the electrode post 330. In addition, the setting of the sealing element 340 can not only improve the internal sealing of the battery cell cover, but also prevent electrolyte overflow from flowing into the electrode post 330, thereby avoiding the risk of insulation failure of the battery cell cover.

[0059] like Figure 8As shown, on the other hand, this application embodiment also provides a battery cell, which includes a core 400, a housing (not shown in the figure), and a battery cell cover plate of any of the above embodiments of this application. It should be noted that the composition of the battery cell cover plate in the battery cell is the same as that of the battery cell cover plate in any one of the above embodiments of this application, so it will not be described again here. The housing and the battery cell cover plate are fastened together to form a receiving cavity. It should be noted that after the housing and the battery cell cover plate can be fastened together, a sealed receiving cavity can be formed by welding methods such as laser welding or ultrasonic welding, thereby ensuring the sealing of the battery cell. The core 400 is located in the receiving cavity. The core 400 includes a main body 410 and at least one tab 420. The tab 420 is located on the top surface of the main body 410 and is welded to the bottom surface of the battery cell cover plate. It should be noted that the tab 420 can be welded to the bottom surface of the second flange 3311 of the corresponding pole 330. It should be understood that the tab 420 is used to transmit current. The tab 420 is directly soldered to the corresponding terminal 330 without the need for other adapters or other structures, thus further simplifying the cell structure, improving cell production efficiency, and reducing the cell's internal resistance. Because the aforementioned cell cover plate has a simple structure and high production efficiency, the cell structure equipped with this cover plate is also relatively simple and has high production efficiency.

[0060] like Figure 8 As shown, in some embodiments, the second flange 3311 has a radial dimension of 10mm to 50mm on the pole post 330, which ensures that the solder marks between the tab 420 and the second flange 3311 are all on the second flange 3311, ensuring that the tab 420 and the pole post 330 fully overlap, improving the stability of the welding between the tab 420 and the pole post 330, while also reducing the exposed size of the tab 420 and reducing foil waste.

[0061] like Figure 8 As shown, in some embodiments, the battery cell further includes a protective sheet 430, which is located on the side of the corresponding tab 420 opposite to the terminal post 330. It should be noted that the protective sheet 430 corresponding to the negative tab 420 can be made of copper, for example, and the protective sheet 430 corresponding to the positive tab 420 can be made of aluminum, for example. The tab 420 can have a multi-layer structure. By stacking the protective sheet 430 on the tab 420, damage to the tab 420 due to laser welding can be prevented when the number of layers of the tab 420 is insufficient. It should be noted that when the number of layers of the tab 420 is 40-100, the protective sheet 430 may not be required. It should also be noted that the battery cell further includes a Mylar film for protecting the core 400 from external environmental influences and preventing short circuits caused by contact between the core 400 and the outer casing, as well as other structures used to compose the battery cell. These embodiments are not limited here.

[0062] In another aspect, the embodiments of the present application also provide a battery, which comprises the cell cover plate of any one of the embodiments of the present application or comprises the cell of any one of the embodiments of the present application. It should be noted that the battery can comprise a plurality of cells. The composition of the cell cover plate or the cell in the battery is the same as that of the cell cover plate or the cell described in any one of the embodiments of the present application, and thus the embodiments of the present application will not be described herein. Since the composition of the cell cover plate is simple and the sealing performance is good, the composition of the battery assembled with the cell cover plate is also relatively simple, thereby the production efficiency is high, and meanwhile the sealing performance is good.

[0063] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only. It is intended to encompass all alternatives, modifications and equivalents thereof within the scope of the present application. The scope of the present application is not intended to be limited to the particular embodiments described in the specification and illustrated in the drawings.

[0064] It is to be understood that the application is not limited to the precise details of construction and the arrangement of components described herein and illustrated in the drawings and that various modifications and changes can be made without departing from the scope of the present application. The scope of the application should only be limited by the claims appended hereto.

Claims

1. A battery cell cover plate, characterized in that, The cell cover plate includes a substrate (100), a first plastic part (200), and an electrode assembly (300); The substrate (100) is provided with a first mounting hole (110); The upper surface of the first plastic part (200) abuts against the lower surface of the substrate (100), and the first plastic part (200) is provided with a second mounting hole (210); The electrode assembly (300) includes a pressure ring (310), a second plastic part (320), and an electrode post (330). The pressure ring (310) is snapped onto the second plastic part (320), and the second plastic part (320) is snapped onto the substrate (100). The pressure ring (310) and the second plastic part (320) are respectively provided with a third mounting hole (311) and a fourth mounting hole (321), wherein the first mounting hole (110), the second mounting hole (210), the third mounting hole (311), and the fourth mounting hole (321) correspond one-to-one and are connected. At least a portion of the pole post (330) is sequentially connected to the second mounting hole (210), the first mounting hole (110), the fourth mounting hole (321), and the third mounting hole (311), with the top end of the pole post (330) circumferentially welded to the wall of the third mounting hole (311).

2. The cell cover plate according to claim 1, characterized in that, The sidewall of the pressure ring (310) is connected to at least two lugs (312); The second plastic part (320) has a groove (322), the bottom of the groove (322) is provided with the fourth mounting hole (321), the groove wall of the groove (322) protrudes outward to form a slot (323) corresponding to the lug (312), and the lug (312) is located in the corresponding slot (323).

3. The cell cover plate according to claim 2, characterized in that, The lug (312) is provided with a positioning groove (3121) with an opening facing the second plastic part (320); The bottom of the slot (323) is connected to a positioning block (3231), which is inserted into the corresponding positioning groove (3121). The thickness of the positioning block (3231) is less than the thickness of the positioning groove (3121).

4. The cell cover plate according to claim 1, characterized in that, The portion of the pressure ring (310) surrounding the third mounting hole (311) is stepped. The pressure ring (310) includes a first stepped surface (313) and a second stepped surface (314). The first stepped surface (313) is higher than the second stepped surface (314). The first stepped surface (313) is used to connect to the busbar. The top surface of the pole post (330) is flush with the second stepped surface (314).

5. The cell cover plate according to claim 1, characterized in that, The electrode assembly (300) also includes a seal (340); The pole post (330) includes a body part (331) and a boss part (332) located on the top surface of the body part (331). The outer side wall of the boss part (332) abuts against the inner wall of the third mounting hole (311). The sealing member (340) is sleeved on the body part (331), and the outer side wall of the sealing member (340) abuts against the inner wall of the first mounting hole (110).

6. The cell cover plate according to claim 5, characterized in that, The bottom of the seal (340) has a first flange (341) in the circumferential direction, and the first flange (341) extends away from the axial direction of the seal (340); The bottom of the body (331) has a second flange (3311) along the circumferential direction, and the second flange (3311) extends away from the axial direction of the body (331); The diameter of the second mounting hole (210) is larger than the diameter of the first mounting hole (110), a portion of the upper surface of the second flange (3311) abuts against the lower surface of the first plastic part (200), and the first flange (341) is sandwiched between the substrate (100) and the second flange (3311).

7. The cell cover plate according to claim 6, characterized in that, The bottom end of the fourth mounting hole (321) is provided with a chamfer (3211) along the circumferential direction, and the chamfer (3211) abuts against the top end of the seal (340).

8. The cell cover plate according to claim 5, characterized in that, The lower surface of the body component (331) has a recess (3312) that is recessed toward the pressure ring (310); The body component (331) has a notch (3313) on its periphery.

9. A battery cell, characterized in that, The battery cell includes a core (400), a housing, and a battery cell cover plate as described in any one of claims 1 to 8; The housing and the cell cover are fastened together to form a receiving cavity; The core (400) is located within the receiving cavity. The core (400) includes a main body (410) and at least one tab (420). The tab (420) is located on the top surface of the main body (410) and is welded to the bottom surface of the cell cover plate.

10. A battery, characterized in that, The battery includes the cell cover plate according to any one of claims 1 to 8, or the battery includes the cell according to claim 9.

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