Top cover assembly and battery monomer

Abstract

The utility model discloses a top cover assembly and a battery monomer, and belongs to the technical field of batteries. The top cover assembly comprises a top cover, an adapter piece and lower plastic, part of the adapter piece is arranged between the top cover and the lower plastic, a connecting piece is arranged on one side, away from a pole, of the top cover, the top cover, the adapter piece and the lower plastic are fixed together through the connecting piece, the melting process between the top cover and the lower plastic and the welding process between the top cover and the adapter piece are omitted, and the welding process between the top cover and the adapter piece is omitted. The assembly forming process of the top cover assembly can be simplified. Thus, when the top cover participates in the conductive connection, the top cover and the switching piece can be directly and conductively connected, the top cover and the switching piece do not need to be insulated, the contact resistance of the top cover and the switching piece is reduced, meanwhile, the structure of the lower plastic cement can be simplified, and the weight and the production cost of the lower plastic cement can be reduced. Moreover, when the top cover assembly and the electrode assembly are assembled in the shell, the top cover assembly has a guiding effect and an electrode assembly fixing effect.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a top cover assembly and a battery cell. Background Art

[0002] As environmental issues become increasingly prominent, people are beginning to actively advocate a low-carbon economy. New energy vehicles are emerging as air quality becomes increasingly serious. Manufacturers and consumers are also beginning to gradually recognize new energy vehicles represented by hybrid vehicles and pure electric vehicles. As the main power source for new energy vehicles, power batteries have become one of the core components of electric vehicles.

[0003] The existing cylindrical battery top cover assembly usually includes a top cover, a rivet, a lower plastic and a pole. The rivet passes through the lower plastic, the top cover and is connected to the pole. In order to ensure the effective connection between the pole and the battery cell tab, a current collector plate is also required to be provided under the lower plastic to connect the tab and the pole. During assembly, the lower plastic and the top cover are first fixed by melting, and then the current collector plate and the top cover are separately welded and fixed, which makes the fixing method of the top cover assembly more complicated. Utility Model Content

[0004] The embodiments of the present application provide a top cover assembly and a battery cell, which solve the problem of a complicated fixing method of the top cover assembly by directly contacting the top cover with the adapter sheet, and reduce the contact impedance between the top cover and the adapter sheet.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] In a first aspect, a top cover assembly is provided, which includes a top cover, an adapter plate and a lower plastic; the top cover includes a top cover body, a connecting piece and a pole, the connecting piece is arranged on one side surface of the top cover body, and the pole is arranged on the other side surface of the top cover body; wherein the top cover, the adapter plate and the lower plastic are fixed by the connecting piece.

[0007] In some embodiments, the adapter plate is provided with a first rivet hole passing through the adapter plate; the lower plastic is provided with a second rivet hole passing through the lower plastic, and the second rivet hole is arranged opposite to the first rivet hole; wherein, the connecting piece is arranged in the first rivet hole and the second rivet hole to fix the top cover, the adapter plate and the lower plastic, and make the adapter plate directly contact with the top cover body.

[0008] In some embodiments, the adapter plate includes a riveted portion and a current collecting plate. The riveted portion is located on the side of the lower plastic facing the top cover, and a first riveted hole is opened in the riveted portion; the current collecting plate is located on the side of the lower plastic away from the top cover, and the current collecting plate is used to electrically connect to the electrode assembly.

[0009] In some embodiments, a side of the lower plastic facing the top cover has a fixing groove, and the riveting portion is disposed in the fixing groove.

[0010] In some embodiments, the riveted portion includes a first portion and a second portion connected to each other, the first portion is provided with a first rivet hole; the fixing groove includes a first sub-groove and a second sub-groove, the first sub-groove is provided with a second rivet hole, the first portion is arranged in the first sub-groove, and the second portion is arranged in the second sub-groove.

[0011] In some embodiments, the adapter plate further includes a bending portion, which is connected between the riveted portion and the current collecting plate, and the bending portion is bent relative to the riveted portion and the current collecting plate.

[0012] In some embodiments, the adapter plate also includes a adapter portion, which is connected between the riveted portion and the current collecting plate; the bending portion includes a first bending portion and a second bending portion; the first bending portion is connected between the adapter portion and the riveted portion, and the second bending portion is connected between the adapter portion and the current collecting plate; when the first bending portion and the second bending portion are respectively in a bent state, the riveted portion, the adapter portion and the current collecting plate are distributed in sequence along the direction away from the top cover.

[0013] In some embodiments, the length of the first portion is greater than that of the second portion, and first riveting holes are respectively provided at two ends of the first portion; and the width of the first sub-groove is greater than that of the second sub-groove.

[0014] In some embodiments, the materials used for the top cover and the adapter plate are both metal materials; the top cover is an integrally formed structure; and / or the adapter plate is an integrally formed structure.

[0015] In a second aspect, a battery cell is provided, comprising a top cover assembly according to any one of the above embodiments; and an electrode assembly disposed below the top cover assembly.

[0016] A top cover assembly and a battery cell of the present application provide a top cover assembly, which provides a connector on the side of the top cover away from the pole, and fixes the top cover, the adapter, and the lower plastic together through the connector, thereby eliminating the melting process between the top cover and the lower plastic and the welding process between the top cover and the adapter, and can simplify the assembly molding process of the top cover assembly. In this way, when the top cover participates in the conductive connection, the top cover and the adapter can be directly conductively connected, and there is no need for insulation between the top cover and the adapter, which reduces the contact impedance between the top cover and the adapter, and at the same time simplifies the structure of the lower plastic, reducing the weight and production cost of the lower plastic. In addition, when the top cover assembly and the electrode assembly are assembled in the shell, the top cover assembly has the function of guiding and fixing the electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 An exploded schematic diagram of a top cover assembly provided in an embodiment of the present application;

[0019] Figure 2 A cross-sectional view of a portion of a top cover assembly provided in an embodiment of the present application;

[0020] Figure 3 A cross-sectional view of a top cover assembly provided in an embodiment of the present application.

[0021] The components of the attached drawings are identified as follows:

[0022] 1-top cover; 2-adapter; 3-lower plastic;

[0023] 11-pole; 12-top cover body; 13-connector; 14-liquid injection hole; 15-hollow part;

[0024] 21-riveted part; 201-first part; 202-second part; 22-adapter; 23-collector plate; 211-first riveted hole; 220-bending part; 221-first bending part; 222-second bending part; 231-center hole;

[0025] 31 -fixing groove; 301 -first sub-groove; 302 -second sub-groove; 311 -second riveting hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0029] In the description of this application, 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, 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 application can be understood according to specific circumstances.

[0030] The top cover assembly of a general cylindrical battery includes a top cover, an adapter, a lower plastic, and a pole. The pole is located on one side of the top cover, and the adapter and the lower plastic are both arranged below the top cover, and the adapter is bent and extends the bottom surface of the lower plastic, so that one end of the adapter is connected to the pole, and the other end is connected to the pole piece of the electrode assembly. In order to ensure that the electrode assembly does not shake in the shell of the cylindrical battery, the top cover and the lower plastic are directly fixed by melting, and the top cover and the adapter are fixed by separate welding. These fixing methods directly lead to a more complicated molding process for the top cover assembly.

[0031] To this end, an embodiment of the present application provides a top cover assembly, which includes a top cover, a transfer sheet and a lower plastic, part of the transfer sheet is arranged between the top cover and the lower plastic, the top cover includes a top cover body, a connector and a pole, the top cover, the transfer sheet and the lower plastic are fixed together by the connector, and the transfer sheet is in direct contact with the top cover body, that is, the top cover, the transfer sheet and the lower plastic are fixed by integral riveting, eliminating the melting process between the top cover and the lower plastic and the welding process between the top cover and the transfer sheet, which can simplify the assembly molding process of the top cover assembly. In this way, when the top cover participates in the conductive connection, the transfer sheet and the top cover can be directly conductively connected, and the transfer sheet and the top cover do not need an insulation function, which reduces the contact impedance between the top cover and the transfer sheet, and at the same time, the structure of the lower plastic can be simplified, reducing the weight and production cost of the lower plastic. In addition, when the top cover assembly and the electrode assembly are assembled in the shell, the top cover assembly has a guiding function, so that the top cover assembly and the electrode assembly are directly fixed. The top cover is an integrated structure to solve the problem of battery leakage. The adapter is provided with a first rivet hole, the lower plastic is provided with a second rivet hole, and the connecting piece is provided in the first rivet hole of the adapter and the second rivet hole of the lower plastic to connect the top cover, the adapter and the lower plastic together. The following is a detailed description.

[0032] The top cover assembly includes a top cover, an adapter plate and a lower plastic. The top cover assembly can fix the top cover, the adapter plate and the lower plastic together through the structure of the top cover itself.

[0033] like Figures 1 to 3 As shown, the top cover 1 includes a top cover body 12, a connector 13 and a pole 11, the connector 13 is arranged on the lower surface of the top cover body 12, and the pole 11 is arranged on the lower surface of the top cover body 12. The top cover assembly fixes the top cover 1, the adapter 2 and the lower plastic 3 through the connector 13, so that the top cover 1 and the adapter 2 are directly conductively connected, and no insulation function is required between the top cover 1 and the adapter 2, thereby reducing the contact impedance between the top cover 1 and the adapter 2, and at the same time, the structure of the lower plastic 3 can be simplified, and the weight of the lower plastic 3 can be reduced, thereby reducing the production cost.

[0034] In one embodiment, a connector 13 protruding from the top cover body 12 is provided on one side surface of the top cover body 12, and a pole 11 protruding from the top cover body 12 is provided on the other side surface of the top cover body 12. The top cover 1 is an integrally formed structure, that is, the top cover 1 can be formed in one manufacturing process. The top cover 1 can be formed by stamping a plate.

[0035] Specifically, Figure 1 As shown, the outer contour of the top cover body 12 is circular, the pole 11 can be set at the center of the top surface of the top cover body 12, and the connector 13 is set on the bottom surface of the top cover body 12 and at the periphery of the pole 11. The outer contour of the pole 11 can be set according to actual needs, for example, the pole 11 can be cylindrical, prism-shaped, truncated cone-shaped or prism-shaped. The top cover body 12, the pole 11, and the connector 13 are integrally formed, so that there is no connection gap between the pole 11 and the top cover body 12. The top cover body 12 can be used to make electrical connections with external equipment.

[0036] In one embodiment, the top cover 1 may be a split structure, that is, the connecting member 13 may be detachably connected to the connecting member 13 to fix the top cover 1, the adapter plate 2 and the lower plastic 3 together.

[0037] like Figure 1 As shown, the top cover body 12 is also provided with a liquid injection hole 14, through which electrolyte can be injected into the electrode assembly in the battery housing.

[0038] In one embodiment, if Figures 1 to 3 As shown, the adapter plate 2 is provided with a first rivet hole 211 penetrating the adapter plate 2, and the lower plastic 3 is provided with a second rivet hole 311 penetrating the lower plastic 3. The second rivet hole 311 is arranged opposite to the first rivet hole 211.

[0039] When the top cover 1 can be an integrally molded structure, the connecting piece 13 passes through the first rivet hole 211 and the second rivet hole 311 in sequence to fix the top cover 1, the adapter plate 2 and the lower plastic 3 together, that is, the top cover 1, the adapter plate 2 and the lower plastic 3 are fixed together by integrally riveting the top cover 1, without the need for additional fixing processes or methods.

[0040] When the top cover 1 is a split structure, the connecting piece 13 passes through the second rivet hole 311 and the first rivet hole 211 in sequence to fix the top cover 1, the adapter plate 2 and the lower plastic 3 together, that is, the top cover 1, the adapter plate 2 and the lower plastic 3 are fixed together by integral riveting molding without the need for additional fixing processes or methods.

[0041] Therefore, whether it is a split-type top cover 1 or an integrally formed top cover 1, the top cover assembly can realize direct contact between the adapter sheet 2 and the top cover body 12. When the top cover 1 participates in the conductive connection, the adapter sheet 2 and the top cover 1 can be directly conductively connected without the need for an insulating function, thereby simplifying the structure of the lower plastic 3 and reducing the weight and production cost of the lower plastic 3. In addition, when the top cover assembly and the electrode assembly are assembled in the housing, the top cover assembly has the function of guiding and fixing the electrode assembly.

[0042] In one embodiment, if Figures 1 to 3 As shown, the adapter plate 2 includes a riveted portion 21 and a collecting plate 23 .

[0043] The riveting portion 21 is located on the side of the lower plastic 3 facing the top cover 1 , that is, the riveting portion 21 is disposed on the upper surface of the upper plastic. The riveting portion 21 defines a first riveting hole 211 .

[0044] Specifically, Figure 1 As shown, the riveted portion 21 includes a first portion 201 and a second portion 202 connected to each other, and the first portion 201 is provided with a first riveting hole 211. The length of the first portion 201 is greater than the length of the second portion 202, so that the weight of the adapter 2 can be reduced. The first riveting holes 211 are respectively provided at both ends of the first portion 201.

[0045] like Figures 1 to 3 As shown, the collecting plate 23 is located on the side of the lower plastic 3 away from the top cover 1, that is, the collecting plate 23 is arranged on the lower surface of the lower plastic 3. The collecting plate 23 is used to be electrically connected to the electrode assembly, so as to realize the electrical connection between the pole 11 and the electrode assembly. The collecting plate 23 is provided with a central hole 231 for aligning the electrode assembly.

[0046] In one embodiment, the current collecting plate 23 is connected to both the pole 11 and the pole lug of the electrode assembly, and the external device is electrically connected to the pole piece assembly through the top cover body 12 or the pole 11 to achieve power transmission of the battery.

[0047] In one embodiment, if Figure 1 As shown, the adapter plate 2 further includes a bending portion 220 , which is connected between the riveted portion 21 and the current collecting plate 23 , and the bending portion 220 is bent relative to the riveted portion 21 and the current collecting plate 23 .

[0048] like Figures 1 to 3 As shown, the adapter plate 2 further includes a adapter portion 22 , and the adapter portion 22 is connected between the riveted portion 21 and the current collecting plate 23 .

[0049] Specifically, the bending portion 220 includes a first bending portion 221 and a second bending portion 222. The first bending portion 221 is connected between the adapter portion 22 and the riveted portion 21, and the second bending portion 222 is connected between the adapter portion 22 and the current collecting plate 23. When the first bending portion 221 and the second bending portion 222 are respectively in a bent state, the riveted portion 21, the adapter portion 22 and the current collecting plate 23 are sequentially distributed in a direction away from the top cover 1. It can be understood that when the first bending portion 221 and the second bending portion 222 are respectively in a bent state, the riveted portion 21, the adapter portion 22 and the current collecting plate 23 are arranged roughly in parallel in a direction away from the top cover 1.

[0050] The adapter plate 2 is an integrally formed structure, that is, the adapter plate 2 can be formed in a single manufacturing process. The adapter plate 2 can be formed by stamping a plate. The adapter plate 2 is an integrally formed structure so that there is no gap between the riveted portion 21 and the adapter portion 22, and between the adapter portion 22 and the current collecting plate 23, and the top cover 1 is an integrally formed structure so that there is no gap between the pole 11 and the top cover body 12. Compared with riveting and welding in the prior art, it can prevent the electrolyte from passing through the top cover assembly, thereby preventing leakage, and improving the quality and reliability of the top cover assembly.

[0051] By respectively providing the top cover 1 and the adapter plate 2 with an integrally formed structure, and the materials used for the top cover 1 and the adapter plate 2 are both metal materials, a direct conductive connection can be achieved between the top cover 1 and the adapter plate 2 without the need for insulation function. Compared with the top cover assembly in the prior art, there is no need to provide plastic and sealing ring, so that the number of structural parts of the top cover assembly can be reduced, which greatly simplifies the processing and assembly processes of the top cover assembly.

[0052] In one embodiment, if Figures 1 to 3 As shown, the lower plastic 3 has a fixing groove 31 on one side facing the top cover 1, and the rivet portion 21 is disposed in the fixing groove 31. The depth of the fixing groove 31 is equal to the thickness of the rivet portion 21, so that when the rivet portion 21 is inserted into the fixing groove 31, the upper surface of the rivet portion 21 is flush with the upper surface of the lower plastic 3. When the top cover assembly is assembled, the lower surface of the top cover body 12 can be respectively fitted with the upper surface of the rivet portion 21 and the upper surface of the lower plastic 3 without any gap, thereby improving the reliability of the top cover assembly.

[0053] Specifically, the fixing groove 31 includes a first sub-groove 301 and a second sub-groove 302, and the first sub-groove 301 is provided with a second rivet hole 311. The first portion 201 of the rivet portion 21 is disposed in the first sub-groove 301, and the second portion 202 of the rivet portion 21 is disposed in the second sub-groove 302. The aperture of the second rivet hole 311 is equal to the aperture of the first rivet hole 211. The connector 13 can be connected to the first rivet hole 211 and the second rivet hole 311, so that the top cover 1, the adapter plate 2, and the lower plastic 3 are fixed by integral riveting molding.

[0054] The width of the first sub-groove 301 is greater than the width of the second sub-groove 302, so that the weight of the adapter 2 can be reduced. The first rivet holes 211 are respectively provided at both ends of the first portion 201. The second sub-groove 302 can avoid the second portion 202 of the rivet portion 21, so as to avoid the lower surface of the top cover body 12 and the upper surface of the rivet portion 21 being uneven when the top cover assembly is assembled, so as to improve the reliability of the top cover assembly.

[0055] In one embodiment, if Figures 2 to 3 As shown, the top cover assembly also includes a hollow portion 15, which is formed by the pole 11, the top cover body 12 and part of the adapter 2, and the hollow portion 15 is arranged opposite to the pole 11. That is, the top cover assembly is provided with the hollow portion 15 at the position corresponding to the pole 11, so that the pole 11 with a hollow structure can be formed. Compared with the pole 11 with a solid structure, the pole 11 with a hollow structure has a smaller weight, thereby making the weight of the top cover 1 plate assembly and the battery cell smaller, which is convenient for lightweighting the battery.

[0056] In one embodiment, a battery cell is provided, the battery cell comprising the above-mentioned top cover assembly and electrode assembly. The electrode assembly is arranged below the top cover assembly. The battery cell may further comprise a housing, a battery cell, etc., and other structures may refer to the prior art.

[0057] The battery cell can be a cylindrical battery, which includes an integrally formed top cover 1 and an adapter plate 2, which can prevent leakage problems, and by providing a connector 13 on the side of the top cover 1 away from the pole 11, the top cover 1, the adapter plate 2, and the lower plastic 3 are fixed together through the connector 13, without the need for an additional fixing process. In this way, when the top cover 1 participates in the conductive connection, the top cover 1 and the adapter plate 2 can be directly conductively connected without the need for an insulating function, thereby simplifying the structure of the lower plastic 3 and reducing the weight and production cost of the lower plastic 3. In addition, when the top cover assembly and the electrode assembly are assembled in the shell, the top cover assembly has a guiding function and a function of fixing the electrode assembly.

[0058] The above is a detailed introduction to a top cover assembly and a battery cell provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A top cover assembly, characterized in that: The top cover assembly includes a top cover, an adapter sheet and a lower plastic, and part of the adapter sheet is arranged between the top cover and the lower plastic; The top cover includes a top cover body, a connecting piece and a pole, wherein the connecting piece is arranged on one side surface of the top cover body, and the pole is arranged on the other side surface of the top cover body; wherein the top cover, the adapter plate and the lower plastic are fixed by the connecting piece.

2. The top cover assembly according to claim 1, characterized in that: The adapter plate is provided with a first rivet hole penetrating the adapter plate; the lower plastic is provided with a second rivet hole penetrating the lower plastic, and the second rivet hole is arranged opposite to the first rivet hole; Wherein, the connecting piece is arranged in the first riveting hole and the second riveting hole to fix the top cover, the adapter plate and the lower plastic.

3. The top cover assembly according to claim 2, characterized in that: The adapter plate includes a riveted portion and a current collecting plate, wherein the riveted portion is located on the side of the lower plastic facing the top cover, and the first riveted hole is formed in the riveted portion; the current collecting plate is located on the side of the lower plastic away from the top cover, and the current collecting plate is used to be electrically connected to the electrode assembly.

4. The top cover assembly according to claim 3, characterized in that: The lower plastic has a fixing groove on one side facing the top cover, and the riveting part is arranged in the fixing groove.

5. The top cover assembly according to claim 4, characterized in that: The riveted portion includes a first portion and a second portion connected to each other, the first portion is provided with the first riveting hole; the fixing groove includes a first sub-groove and a second sub-groove, the first sub-groove is provided with the second riveting hole, the first portion is arranged in the first sub-groove, and the second portion is arranged in the second sub-groove.

6. The top cover assembly according to claim 3, characterized in that: The adapter plate further includes a bending portion, which is connected between the riveted portion and the current collecting plate, and is bent relative to the riveted portion and the current collecting plate.

7. The top cover assembly according to claim 6, characterized in that: The adapter plate further includes an adapter portion, and the adapter portion is connected between the riveted portion and the current collecting plate; the bending portion includes a first bending portion and a second bending portion; The first bending portion is connected between the adapter portion and the riveted portion, and the second bending portion is connected between the adapter portion and the current collecting plate; When the first bending portion and the second bending portion are respectively in a bent state, the riveted portion, the transition portion, and the collecting plate are sequentially distributed in a direction away from the top cover.

8. The top cover assembly according to claim 5, characterized in that: The length of the first part is greater than that of the second part, and the first riveting holes are respectively formed at two ends of the first part; The width of the first sub-groove is greater than the width of the second sub-groove.

9. The top cover assembly according to claim 1, characterized in that: The top cover and the adapter are both made of metal materials; The top cover is an integrally formed structure; and / or, The adapter sheet is an integrally formed structure.

10. A battery cell, characterized in that: include: The top cover assembly according to any one of claims 1 to 9; as well as The electrode assembly is arranged below the top cover assembly.

Images