Battery cover plate assembly and power battery

Abstract

The utility model provides a battery cover plate assembly and a power battery. The battery cover plate assembly comprises a light cover plate; the conductive pressing plate is arranged on the top of the light cover plate; the conductive connecting piece is connected with the conductive pressing plate in a welding manner; and at least part of the insulation structure is arranged between the conductive pressing plate and the light cover plate. When the battery cover plate assembly disclosed by the utility model is mounted, the conductive pressing plate can be electrically connected with the battery cell, and meanwhile, the rod part of the conductive connecting piece is electrically connected with the busbar, so that the electric conduction of the busbar and the battery cell is realized; the conductive connecting piece and the conductive pressing plate are tightly connected together, the conductive connecting piece and the conductive pressing plate are in good contact, the effect of reducing the internal resistance between the conductive connecting piece and the conductive pressing plate is achieved, and the situation that the internal resistance between the conductive connecting piece and the conductive pressing plate is too large, and consequently the temperature of the power battery rises is avoided; therefore, the use safety performance of the power battery can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery cover assembly and a power battery. Background Art

[0002] A power battery is a storage battery that provides power for electric vehicles, electric trains, electric bicycles, etc. As an important part of a power battery, the quality of the battery cover assembly directly affects the working performance of the power battery.

[0003] Currently, the battery cover assemblies on the market are composed of a light cover plate, electrode terminals, and an insulating structure. The electrode terminals include a pressure plate, a conductive connecting piece, and a rivet. The insulating structure includes an upper plastic, a lower plastic, and a sealing ring. During the assembly process, the rivet presses the pressure plate onto the top of the light cover plate, and the pressure plate indirectly presses the conductive connecting piece onto the light cover plate. Moreover, the electrode terminals and the light cover plate are sealed and insulated by the insulating structure. However, due to the connection structure between the pressure plate and the conductive connecting piece, the internal resistance between the pressure plate and the conductive connecting piece is too large, affecting the safety performance of the power battery. Summary of the Utility Model

[0004] The embodiments of the present application provide a battery cover assembly and a power battery to solve the problems existing in the related technologies. The technical solutions are as follows:

[0005] In a first aspect, the embodiments of the present application provide a battery cover assembly, including:

[0006] A light cover plate;

[0007] A conductive pressure plate, which is arranged on the top of the light cover plate and is used for electrically connecting with the battery cell;

[0008] A conductive connecting piece, the head of which is connected to the conductive pressure plate by welding, and the rod part of which is used for electrically connecting with the bus bar;

[0009] An insulating structure, at least a part of which is arranged between the conductive pressure plate and the light cover plate.

[0010] In an implementation manner, the conductive pressure plate has a connection hole, the connection hole penetrates the conductive pressure plate up and down, the connection hole has a first hole section and a second hole section arranged in sequence from top to bottom, and the aperture of the second hole section is larger than that of the first hole section to form a stepped end face therebetween;

[0011] The head of the conductive connecting member is inserted into the second hole section, the top end surface of the head of the conductive connecting member abuts against the stepped end surface, and the outer peripheral wall of the head of the conductive connecting member and the hole wall of the second hole section are connected together by welding. The rod portion of the conductive connecting member passes through the first hole section and is exposed outside the voltage conducting plate;

[0012] At least part of the insulating structure is clamped between the bottom of the head and the bottom of the optical cover plate.

[0013] In one embodiment, the optical cover plate has a first riveting hole, and the first riveting hole penetrates through the optical cover plate both vertically and horizontally;

[0014] The voltage conducting plate has a second riveting hole, and the second riveting hole penetrates through the voltage conducting plate both vertically and horizontally;

[0015] The battery cover plate assembly further includes:

[0016] A conductive rivet, the head of the conductive rivet is located below the bottom of the optical cover plate, the head is used for electrically connecting with the battery cell, and the shank of the conductive rivet sequentially passes through the first riveting hole and the second riveting hole and is riveted to the voltage conducting plate together to limit the voltage conducting plate on the optical cover plate;

[0017] The insulating structure includes:

[0018] A first insulating part, the first insulating part is clamped between the top of the optical cover plate and the bottom of the voltage conducting plate to insulate the optical cover plate and the voltage conducting plate;

[0019] A second insulating part, the second insulating part is clamped between the optical cover plate and the conductive rivet to insulate the optical cover plate and the conductive rivet.

[0020] In one embodiment, the battery cover plate assembly further includes:

[0021] A conductive connecting piece, the conductive connecting piece is arranged between the bottom of the optical cover plate and the head, and the conductive connecting piece is used for electrically connecting with the battery cell;

[0022] The insulating structure further includes:

[0023] A third insulating part, at least part of the third insulating part is clamped between the bottom of the optical cover plate and the top of the conductive connecting piece to insulate the optical cover plate and the conductive connecting piece.

[0024] In one embodiment, the third insulating part has a first through hole, the first through hole penetrates through the third insulating part both vertically and horizontally, the first through hole is for the shank to pass through, and the aperture of the first through hole is smaller than the outer diameter of the head.

[0025] In one embodiment, the second insulating part includes:

[0026] A first insulating section located in the first through-hole, the first insulating section being disposed around the nail rod, and the first insulating section being clamped between the bottom of the optical cover plate and the top of the conductive connecting piece;

[0027] A second insulating section disposed on the top of the first insulating section, the second insulating section being disposed around the nail rod, and the second insulating section being clamped between the hole wall of the first riveting hole and the outer peripheral wall of the nail rod.

[0028] In one embodiment, the second insulating part is a sealing ring.

[0029] In one embodiment, the top of the first insulating part has a groove surrounding the voltage conducting plate.

[0030] In one embodiment, both the first insulating part and the third insulating part are structures made of plastic material.

[0031] In one embodiment, the conductive connecting members are provided with the conductive rivets on both sides along the length direction of the optical cover plate;

[0032] The conductive connecting piece has a second through-hole that penetrates the conductive connecting piece up and down, and the second through-hole is for the nail rod on a corresponding conductive rivet to pass through, and the aperture of the second through-hole is smaller than the outer diameter of the nail head.

[0033] In a second aspect, an embodiment of the present application provides a power battery and the above-mentioned battery cover assembly.

[0034] The advantages or beneficial effects in the above technical solutions at least include:

[0035] For the battery cover assembly of the present utility model, during installation, the voltage conducting plate can be used to electrically connect with the battery cell, and at the same time, the rod part of the conductive connecting member is used to electrically connect with the bus bar, so as to realize the electrical conduction between the bus bar and the battery cell. Among them, since the head of the conductive connecting member and the voltage conducting plate are connected together by welding, the conductive connecting member and the voltage conducting plate are tightly connected together, and the conductive connecting member and the voltage conducting plate are in good contact, which plays a role in reducing the internal resistance between the conductive connecting member and the voltage conducting plate, avoiding the excessive internal resistance between the conductive connecting member and the voltage conducting plate from causing the temperature of the power battery to rise, and thus being able to improve the use safety performance of the power battery.

[0036] The above summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will be readily apparent by reference to the drawings and the following detailed description. Description of the Drawings

[0037] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0038] Figure 1 is a partial cross-sectional view of the battery cover assembly of the present utility model;

[0039] Figure 2 is an exploded view of the battery cover assembly of the present utility model.

[0040] Reference Numerals

[0041] 1. Optical cover plate; 11. First riveting hole; 2. Conductive pressure plate; 21. Connection hole; 211. First hole section; 212. Second hole section; 22. Second riveting hole; 3. Conductive connecting piece; 31. Head; 32. Rod portion; 4. Insulating structure; 41. First insulating portion; 411. Groove; 42. Second insulating portion; 421. First insulating section; 422. Second insulating section; 43. Third insulating portion; 431. First perforation; 5. Conductive rivet; 51. Nail head; 52. Nail rod; 6. Conductive connecting piece; 61. Second perforation. Detailed Embodiments

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0043] See Figure 1 - Figure 2 , which shows a battery cover assembly according to a preferred embodiment of the present utility model, including:

[0044] Optical cover plate 1;

[0045] Conductive pressure plate 2, the conductive pressure plate 2 is disposed on the top of the optical cover plate 1, and the conductive pressure plate 2 is used for electrically connecting with the battery cell;

[0046] Conductive connecting piece 3, the head 31 of the conductive connecting piece 3 and the conductive pressure plate 2 are connected together by welding, and the rod portion 32 of the conductive connecting piece 3 is used for electrically connecting with the bus bar;

[0047] The insulating structure 4, at least a part of the insulating structure 4 is disposed between the voltage-conducting plate 2 and the optical cover plate 1.

[0048] For the battery cover plate assembly of the present utility model, during installation, the voltage-conducting plate 2 can be used to be electrically connected to the battery cell. At the same time, the rod portion 32 of the conductive connecting member 3 is electrically connected to the bus bar, so as to realize the electrical conduction between the bus bar and the battery cell. Among them, since the head portion 31 of the conductive connecting member 3 and the voltage-conducting plate 2 are connected together by a welding method, the conductive connecting member 3 and the voltage-conducting plate 2 are tightly connected together, and the conductive connecting member 3 and the voltage-conducting plate 2 are in good contact, which plays a role in reducing the internal resistance between the conductive connecting member 3 and the voltage-conducting plate 2, and avoids the excessive internal resistance between the conductive connecting member 3 and the voltage-conducting plate 2 from causing the temperature of the power battery to rise, thereby being able to improve the use safety performance of the power battery.

[0049] In an embodiment, the rod portion 32 is provided with a threaded structure for connecting with the bus bar to electrically connect the conductive connecting member 3 and the bus bar together.

[0050] Specifically, the threaded structure can be an external threaded structure or an internal threaded structure. In the case of an external threaded structure, the external threaded structure can be screwed with a nut on the bus bar to electrically connect the conductive connecting member 3 and the bus bar together. In the case of an internal threaded structure, the conductive connecting member 3 and the internal threaded structure can be cooperated to electrically connect the conductive connecting member 3 and the bus bar together.

[0051] In this embodiment, the head portion 31 of the conductive connecting member 3 and the voltage-conducting plate 2 are connected together by a laser welding method to improve the assembly efficiency. At the same time, the welding quality is improved to achieve the purpose of reducing the internal resistance and improving the internal resistance yield rate.

[0052] See Figure 1 , in an embodiment, the voltage-conducting plate 2 has a connection hole 21, the connection hole 21 penetrates through the voltage-conducting plate 2 both vertically and horizontally. The connection hole 21 has a first hole section 211 and a second hole section 212 which are arranged in sequence from top to bottom. The aperture of the second hole section 212 is larger than that of the first hole section 211 to form a stepped end face therebetween;

[0053] The head portion 31 of the conductive connecting member 3 is inserted into the second hole section 212, the top end face of the head portion 31 of the conductive connecting member 3 abuts against the stepped end face, and the outer peripheral wall of the head portion 31 of the conductive connecting member 3 and the hole wall of the second hole section 212 are connected together by a welding method. The rod portion 32 of the conductive connecting member 3 passes through the first hole section 211 and is exposed outside the voltage-conducting plate 2;

[0054] At least a part of the insulating structure 4 is clamped between the bottom of the head 31 and the bottom of the optical cover plate 1. Since the head 31 of the conductive connecting piece 3 is inserted into the second hole section 212, the top end surface of the head 31 of the conductive connecting piece 3 abuts against the stepped end surface, and the outer peripheral wall of the head 31 of the conductive connecting piece 3 and the hole wall of the second hole section 212 are connected together by welding. This not only increases the contact area between the conductive connecting piece 3 and the voltage conducting plate 2, but also enables the head 31 of the conductive connecting piece 3 and the voltage conducting plate 2 to be connected more tightly, and the conductive connecting piece 3 and the voltage conducting plate 2 to be in better contact, thereby further reducing the internal resistance between the conductive connecting piece 3 and the voltage conducting plate 2. In addition, since at least a part of the insulating structure 4 is clamped between the bottom of the head 31 and the bottom of the optical cover plate 1, while insulating the conductive connecting piece 3 and the optical cover plate 1, in the case where the conductive connecting piece 3 becomes loose, the head 31 of the conductive connecting piece 3 is pressed by the insulating structure 4 and still can reliably abut against the stepped end surface, restricting the conductive connecting piece 3 from detaching from the voltage conducting plate 2, which is beneficial to improving the assembly stability of the conductive connecting piece 3 and avoiding poor contact between the conductive connecting piece 3 and the voltage conducting plate 2, thereby further reducing the internal resistance between the conductive connecting piece 3 and the voltage conducting plate 2.

[0055] See Figure 1 - Figure 2 , in an embodiment, the optical cover plate 1 has a first riveting hole 11 that penetrates through the optical cover plate 1 both vertically and horizontally;

[0056] The voltage conducting plate 2 has a second riveting hole 22 that penetrates through the voltage conducting plate 2 both vertically and horizontally;

[0057] The battery cover plate assembly further includes:

[0058] A conductive rivet 5, the head 51 of the conductive rivet 5 is located below the bottom of the optical cover plate 1, the head 51 is used for electrical connection with the battery cell, and the shank 52 of the conductive rivet 5 sequentially passes through the first riveting hole 11 and the second riveting hole 22 and is riveted to the voltage conducting plate 2 to limit the voltage conducting plate 2 on the optical cover plate 1;

[0059] The insulating structure 4 includes:

[0060] A first insulating portion 41, the first insulating portion 41 is clamped between the top of the optical cover plate 1 and the bottom of the voltage conducting plate 2 to insulate the optical cover plate 1 and the voltage conducting plate 2;

[0061] A second insulating portion 42, the second insulating portion 42 is clamped between the optical cover plate 1 and the conductive rivet 5 to insulate the optical cover plate 1 and the conductive rivet 5. In this way, the voltage conducting plate 2 and the optical cover plate 1 can be reliably connected together by the conductive rivet 5. At the same time, the conductive rivet 5 and the voltage conducting plate 2 are tightly connected, ensuring good contact between the conductive rivet 5 and the voltage conducting plate 2, capable of reducing the internal resistance between the conductive rivet 5 and the voltage conducting plate 2, which is beneficial to further improving the use safety performance of the power battery.

[0062] For convenient electrical connection with the battery cell, refer to Figure 1 - Figure 2 , in one embodiment, the battery cover plate assembly further includes:

[0063] A conductive connection piece 6, which is arranged between the bottom of the optical cover plate 1 and the nail head 51, and the conductive connection piece 6 is used for electrically connecting with the battery cell;

[0064] The insulating structure 4 further includes:

[0065] A third insulating portion 43, at least part of the third insulating portion 43 is clamped between the bottom of the optical cover plate 1 and the top of the conductive connection piece 6 to insulate the optical cover plate 1 and the conductive connection piece 6.

[0066] Refer to Figure 1 - Figure 2 , in one embodiment, the third insulating portion 43 has a first through hole 431, the first through hole 431 penetrates through the third insulating portion 43 both vertically, the first through hole 431 is for the nail rod 52 to pass through, and the aperture of the first through hole 431 is smaller than the outer diameter of the nail head 51 to limit the third insulating portion 43 from detaching from the optical cover plate 1, thereby improving the assembly stability of the third insulating portion 43.

[0067] Refer to Figure 1 - Figure 2 , in one embodiment, the second insulating portion 42 includes:

[0068] A first insulating section 421, which is located in the first through hole 431, the first insulating section 421 is arranged around the nail rod 52, and the first insulating section 421 is clamped between the bottom of the optical cover plate 1 and the top of the conductive connection piece 6;

[0069] A second insulating section 422, which is arranged on the top of the first insulating section 421, the second insulating section 422 is arranged around the nail rod 52, and the second insulating section 422 is clamped between the hole wall of the first riveting hole 11 and the outer peripheral wall of the nail rod 52 to increase the contact area between the second insulating portion 42 and the conductive rivet 5 and between the second insulating portion 42 and the optical cover plate 1, which is beneficial to improving the insulation performance.

[0070] Refer to Figure 1 - Figure 2 , in one embodiment, the second insulating portion 42 is a sealing ring, so that while the second insulating portion 42 can play an insulating role, it can also play a sealing role, and can reliably seal the gap between the optical cover plate 1 and the conductive rivet 5, thereby improving the airtightness of the battery cover plate assembly.

[0071] Refer to Figure 1 - Figure 2 , in one embodiment, the top of the first insulating portion 41 has a groove 411, the groove 411 surrounds the voltage conducting plate 2, so as to increase the contact area between the first insulating portion 41 and the voltage conducting plate 2, and can further improve the insulation performance.

[0072] In one embodiment, both the first insulating portion 41 and the third insulating portion 43 are structures made of plastic material, so that the first insulating portion 41 and the third insulating portion 43 have better insulating properties, thereby improving the insulating performance of the battery cover assembly.

[0073] See Figure 1 - Figure 2 , in one embodiment, conductive rivets 5 are provided on both sides of the conductive connecting member 3 along the length direction of the optical cover plate 1;

[0074] The conductive connecting piece 6 has a second through hole 61, and the second through hole 61 penetrates through the conductive connecting piece 6 both vertically and horizontally. The second through hole 61 is for the nail rod 52 on a corresponding conductive rivet 5 to pass through, and the aperture of the second through hole 61 is smaller than the outer diameter of the nail head 51, so as to further improve the connection stability between the voltage guiding plate 2 and the optical cover plate 1 and between the voltage guiding plate 2 and the conductive connecting member 3. While facilitating the improvement of the assembly stability of the battery cover assembly, it can also further reduce the internal resistance between the voltage guiding plate 2 and the conductive connecting member 3, making the power battery safer to use.

[0075] A preferred embodiment of the present invention provides a power battery and the above-mentioned battery cover assembly.

[0076] Due to the adoption of the above-mentioned battery cover assembly, the power battery of the present invention can also make the conductive connecting member 3 and the voltage guiding plate 2 be tightly connected together, and the conductive connecting member 3 and the voltage guiding plate 2 are in good contact, which plays a role in reducing the internal resistance between the conductive connecting member 3 and the voltage guiding plate 2, avoiding the excessive internal resistance between the conductive connecting member 3 and the voltage guiding plate 2 from causing the temperature of the power battery to rise, thereby improving the use safety performance of the power battery.

[0077] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0079] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. Battery cover assembly, characterized in that, Comprising: Light cover plate; Conductive pressure plate, the conductive pressure plate is arranged on the top of the light cover plate, and the conductive pressure plate is used for electrically connecting with the battery cell; Conductive connecting piece, the head of the conductive connecting piece and the conductive pressure plate are connected together by welding, and the rod part of the conductive connecting piece is used for electrically connecting with the bus bar; Insulating structure, at least part of the insulating structure is arranged between the conductive pressure plate and the light cover plate.

2. The battery cover assembly according to claim 1, wherein The conductive pressure plate has a connection hole, the connection hole penetrates through the conductive pressure plate up and down, the connection hole has a first hole section and a second hole section arranged in sequence from top to bottom, and the aperture of the second hole section is larger than that of the first hole section to form a stepped end face therebetween; The head of the conductive connecting piece is inserted into the second hole section, the top end face of the head of the conductive connecting piece abuts against the stepped end face, and the outer peripheral wall of the head of the conductive connecting piece and the hole wall of the second hole section are connected together by welding, and the rod part of the conductive connecting piece passes through the first hole section and is exposed outside the conductive pressure plate; At least part of the insulating structure is clamped between the bottom of the head and the bottom of the light cover plate.

3. The battery cover plate assembly according to claim 1, wherein, The light cover plate has a first riveting hole, and the first riveting hole penetrates through the light cover plate up and down; The conductive pressure plate has a second riveting hole, and the second riveting hole penetrates through the conductive pressure plate up and down; The battery cover plate assembly further comprises: Conductive rivet, the head of the conductive rivet is located below the bottom of the light cover plate, the head is used for electrically connecting with the battery cell, and the nail rod of the conductive rivet sequentially passes through the first riveting hole and the second riveting hole and is riveted with the conductive pressure plate together to limit the conductive pressure plate on the light cover plate; The insulating structure includes: First insulating part, the first insulating part is clamped between the top of the light cover plate and the bottom of the conductive pressure plate to insulate the light cover plate and the conductive pressure plate; Second insulating part, the second insulating part is clamped between the light cover plate and the conductive rivet to insulate the light cover plate and the conductive rivet.

4. The battery cover assembly according to claim 3, wherein, The battery cover plate assembly further comprises: Conductive connecting piece, the conductive connecting piece is arranged between the bottom of the light cover plate and the head, and the conductive connecting piece is used for electrically connecting with the battery cell; The insulating structure further includes: Third insulating part, at least part of the third insulating part is clamped between the bottom of the light cover plate and the top of the conductive connecting piece to insulate the light cover plate and the conductive connecting piece.

5. The battery cover assembly according to claim 4, wherein, The third insulating part has a first through hole, the first through hole penetrates through the third insulating part up and down, the first through hole is for the nail rod to pass through, and the aperture of the first through hole is smaller than the outer diameter of the nail head.

6. The battery cover assembly according to claim 5, characterized in that, The second insulating part includes: First insulating section, the first insulating section is located in the first through hole, the first insulating section is arranged around the nail rod, and the first insulating section is clamped between the bottom of the light cover plate and the top of the conductive connecting piece; Second insulating section, the second insulating section is arranged on the top of the first insulating section, the second insulating section is arranged around the nail rod, and the second insulating section is clamped between the hole wall of the first riveting hole and the outer peripheral wall of the nail rod.

7. The battery cover plate assembly according to claim 3, wherein, The second insulating part is a sealing ring.

8. The battery cover assembly according to claim 4, characterized in that, The top of the first insulating part has a groove, and the groove is arranged around the voltage-conducting plate.

9. The battery cover plate assembly according to claim 4, characterized in that, The conductive connecting piece is provided with the conductive rivets on both sides along the length direction of the light cover plate; The conductive connecting piece has a second perforation, and the second perforation penetrates through the conductive connecting piece up and down. The second perforation is for the nail rod on a corresponding conductive rivet to pass through, and the aperture of the second perforation is smaller than the outer diameter of the nail head.

10. Power battery, characterized in that, The battery cover plate assembly according to any one of claims 1-9.

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