A battery cover assembly, a core support device, and a square battery

Abstract

This invention provides a battery cover assembly, a core support device, and a square battery. The solution includes at least: a cover body, a first insulating member, a first fixing member, and a positive conductive post; the cover body has a first groove for accommodating the first fixing member, the first fixing member includes a first annular member and a second annular member, the second annular member has a first protrusion for accommodating the positive conductive post; a second groove is provided in the first groove, and a first through hole is provided at the center of the first groove, and a second through hole is provided in the first protrusion; the first annular member has a third through hole corresponding to the second groove, and the second annular member has a fourth through hole in the vertical direction and a fifth through hole in the horizontal direction; the first insulating member achieves insulation and fixation between the cover body, the first fixing member, and the positive conductive post through the third through hole, the fourth through hole, the fifth through hole, and the second groove.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery cover assembly, a core support device, and a square battery. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the rapid development of new energy, square power batteries are being used more and more widely. As an important component of the battery, the cover plate assembly is directly related to the stability and safety of the battery.

[0004] The inventors discovered that the poles of existing cover plate assemblies mainly adopt injection molding or minimalist structures. However, the poles of injection molding structures have relatively small push-pull force and torque, which pose a risk of fatigue failure during long-term vehicle use. On the other hand, the poles of minimalist structures are connected to the cover plate by laser welding. The quality of the weld has a great impact on the reliability of the cover plate's sealing and other aspects, and also poses a risk of failure during long-term use. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a battery cover assembly, a core support device, and a square battery, which solves the defects of existing electrode connection methods and improves battery stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a battery cover assembly, comprising at least: a cover body, a first insulating member, a first fixing member, and a positive electrode conductive post;

[0008] The cover plate body has a first groove for accommodating a first fixing member. The first fixing member includes a first annular member and a second annular member. The second annular member has a first protrusion for accommodating a positive conductive post. The first groove contains a second groove, and the center of the first groove has a first through hole, and the first protrusion contains a second through hole.

[0009] The first annular component is provided with a third through hole corresponding to the second groove, and the second annular component is provided with a fourth through hole in the vertical direction and a fifth through hole in the horizontal direction.

[0010] The first insulating component achieves insulation and fixation between the cover plate body, the first fixing component, and the positive electrode conductive post through the third through hole, the fourth through hole, the fifth through hole, and the second groove.

[0011] As one possible implementation of the first aspect of the present invention, a sealing ring is provided in the first groove.

[0012] As an optional implementation of the first aspect of the present invention, the first annular member is fixedly connected to the cover plate body.

[0013] As a further limitation of the first aspect of the present invention, the third and fourth through holes are oblong holes, the fifth through hole is a circular hole, and the second groove is an oblong groove.

[0014] As a further limitation of the first aspect of the present invention, the first annular member and the second annular member are fixedly connected, the first annular member is tightly fitted with the first groove, and the first protrusion of the second annular member accommodates the positive conductive post and the sealing ring.

[0015] As a further limitation of the first aspect of the present invention, the sealing ring is in contact with the cover plate body, the positive conductive post, the first fixing member and the first insulating member respectively.

[0016] As an optional implementation of the first aspect of the present invention, it further includes a negative conductive post, a second insulating member, and a second fixing member;

[0017] The cover plate body has a third groove for accommodating the second fixing member. The second fixing member includes a third annular member and a fourth annular member. The fourth annular member has a second protrusion for accommodating the negative electrode conductive post. The third groove is provided with a fourth groove, and a sixth through hole is opened at the center of the third groove. A seventh through hole is opened in the second protrusion.

[0018] The third ring-shaped component is provided with an eighth through hole corresponding to the fourth groove, and the fourth ring-shaped component is provided with a ninth through hole in the vertical direction and a tenth through hole in the horizontal direction.

[0019] The second insulating component achieves insulation and fixation between the cover plate body, the second fixing component, and the negative electrode conductive post through the eighth through hole, the ninth through hole, the tenth through hole, and the fourth groove.

[0020] As a further limitation of the first aspect of the present invention, the eighth and ninth through holes are oblong holes, the tenth through hole is a circular hole, and the fourth groove is an oblong groove.

[0021] As a further limitation of the first aspect of the present invention, the third annular member and the fourth annular member are fixedly connected, the third annular member is tightly fitted with the third groove, and the second protrusion of the fourth annular member accommodates the negative electrode conductive post and the sealing ring.

[0022] As a further limitation of the first aspect of the present invention, the sealing ring is in contact with the cover plate body, the negative electrode conductive post, the second fixing member and the second insulating member respectively.

[0023] As a further limitation of the first aspect of the invention, it also includes an under-cover insulating member, which is fixedly connected to the cover plate body.

[0024] A second aspect of the present invention provides a core carrier device, including a housing and a battery cover assembly as described in the first aspect of the present invention, wherein the battery cover assembly is fixedly connected to the housing to form a sealed cavity for accommodating the core.

[0025] A third aspect of the present invention provides a square battery, including the battery cover assembly described in the first aspect of the present invention; or, including the electrode core support device described in the second aspect of the present invention.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) The present invention provides a battery cover plate assembly, a core support device and a square battery. The solution provides a fixing member with several horizontal and vertical through holes, which cooperates with the groove structure of the cover plate body. An insulating member is generated by injection molding. The insulating member achieves insulation and fixation between the cover plate body, the fixing member and the positive and negative electrode conductive posts through the through holes on the fixing member and the groove of the cover plate body. This effectively solves the defects of the existing electrode connection method and improves the battery stability.

[0028] (2) The solution of the present invention connects and fixes the part of the fastener and the groove of the cover plate body by laser welding, and effectively fixes the pole and the cover plate body in a secondary manner. Through these two fixing methods, the positive and negative poles and the cover plate body can be further guaranteed in terms of push-pull force, torque and sealing performance, thereby ensuring the safety performance of the battery. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0030] Figure 1 This is a schematic diagram of a cover plate assembly according to an embodiment of the present invention;

[0031] Figure 2 This is an exploded view of a cover plate assembly described in an embodiment of the present invention;

[0032] Figure 3 This is an exploded view of a cover plate assembly described in an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional view of a cover plate assembly as described in an embodiment of the present invention;

[0034] Figure 5 As described in the embodiments of the present invention Figure 4 A magnified view of a portion of region B in the middle;

[0035] Figure 6This is a schematic diagram of the structure of the fastener described in an embodiment of the present invention;

[0036] Among them, 10 is the positive electrode post; 101 is the first insulating component; 102 is the first fixing component; 103 is the positive conductive post; 104 is the positive sealing ring; 20 is the negative electrode post; 201 is the second insulating component; 2011 is the plastic boss on the negative electrode; 2012 is the plastic boss on the negative electrode; 2013 is the plastic boss on the negative electrode; 2014 is the plastic anti-rotation boss on the negative electrode; 202 is the second fixing component; and 2021 is the ninth through hole. ; 2022, Eighth through hole; 2023, Tenth through hole; 203, Negative conductive post; 2031, Aluminum part of negative conductive post; 2032, Copper part of negative conductive post; 2033, Anti-rotation notch of negative conductive post; 204, Negative sealing ring; 30, Cover plate body; 301, Fourth groove; 40, Explosion-proof valve; 401, Rupture disc; 402, Explosion-proof valve protective plate; 50, Injection hole; 60, Under-cover insulating component. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0041] Example 1:

[0042] like Figures 1 to 2 As shown, this embodiment provides a battery cover assembly, which includes at least: a cover body 30 and a positive electrode post 10, wherein the positive electrode post 10 includes at least a first insulating member 101, a first fixing member 102 and a positive conductive post 103;

[0043] In a specific implementation, the battery cover assembly also includes an explosion-proof valve 40 and an injection hole 50, the injection hole being used for electrolyte injection; wherein, the explosion-proof valve 40 is composed of a rupture disc 401 and an explosion-proof valve protection disc 402;

[0044] The cover plate body 30 has a first groove for accommodating the first fixing member 102. The first fixing member 102 includes a first annular member and a second annular member. The second annular member has a first protrusion for accommodating the positive electrode conductive post 103. The first groove is provided with a second groove, and the center of the first groove has a first through hole, and the first protrusion has a second through hole.

[0045] The first annular component is provided with a third through hole corresponding to the second groove. One or more third through holes can be provided. Preferably, multiple third through holes are provided and the multiple third through holes are evenly distributed. The second annular component is provided with a fourth through hole in the vertical direction and a fifth through hole in the horizontal direction.

[0046] The first insulating component 101 achieves insulation and fixation between the cover plate body 30, the first fixing component 102, and the positive electrode conductive post 103 through the third through hole, the fourth through hole, the fifth through hole, and the second groove.

[0047] As an optional implementation, a positive sealing ring 104 is provided in the first groove.

[0048] As an optional implementation, the first annular component is fixedly connected to the cover plate body 30.

[0049] As a further limitation, the third and fourth through holes are oblong holes, the fifth through hole is a circular hole, and the second groove is an oblong groove.

[0050] As a further limitation, the first annular component and the second annular component are fixedly connected, preferably by laser welding. The first annular component fits tightly with the first groove, and the first protrusion of the second annular component accommodates the positive electrode conductive post 103 and the positive electrode sealing ring 104.

[0051] As a further limitation, the positive electrode sealing ring 104 is in contact with the cover plate body 30, the positive electrode conductive post 103, the first fixing member 102 and the first insulating member 101 respectively.

[0052] As an optional implementation method, such as Figure 3 As shown, the battery cover assembly further includes a negative electrode post 20, which includes at least a negative electrode conductive post 203, a second insulating member 201, and a second fixing member 202; preferably, the negative electrode post 20 further includes a negative electrode sealing ring 204.

[0053] The cover plate body 30 has a third groove for accommodating the second fixing member 202. The second fixing member 202 includes a third annular member and a fourth annular member. The fourth annular member has a second protrusion for accommodating the negative electrode conductive post. The third groove is provided with a fourth groove 301, and a sixth through hole is opened at the center of the third groove. A seventh through hole is opened in the second protrusion.

[0054] The third annular component is provided with an eighth through hole 2022 corresponding to the fourth groove, and the fourth annular component is provided with a ninth through hole 2021 in the vertical direction and a tenth through hole 2023 in the horizontal direction; for example Figure 6 The diagram shows the overall structure of the fastener.

[0055] The second insulating member 201 achieves insulation and fixation between the cover plate body 30, the second fixing member 202, and the negative electrode conductive post 203 through the eighth through hole 2022, the ninth through hole 2021, the tenth through hole 2023, and the fourth groove 301.

[0056] In specific implementation, the eighth through hole 2022 and the ninth through hole 2021 are waist-shaped holes, the tenth through hole 2023 is a circular hole, and the fourth groove 301 is a waist-shaped groove; the third annular part and the fourth annular part are fixedly connected, the third annular part and the third groove are tightly fitted, and the second convex groove of the fourth annular part accommodates the negative electrode conductive post 203 and the negative electrode sealing ring 204.

[0057] In practice, the negative electrode sealing ring contacts the cover plate body 30, the negative electrode conductive post 203, the second fixing member 202, and the second insulating member 201, respectively.

[0058] As a further limitation, it also includes a cover plate under-insulator 60, which is fixedly connected to the cover plate body 30.

[0059] In practical implementation, the sealing ring is located between the positive and negative terminals, the cover plate body, the fixing components, and the insulating components. It provides insulation for the positive and negative terminals, the cover plate body, and the fixing components, and also seals the battery. The cover plate body, the first / second fixing components, and the positive conductive post are made of aluminum. The first / second insulating components and the positive and negative sealing rings are made of rubber and / or plastic. The negative conductive post is made of copper-aluminum composite material, which is processed into copper-aluminum composite plates by cold rolling or hot rolling, and then formed by machining or pressing. The assembly method of this cover plate assembly is as follows: after the cover plate body, positive and negative fixing components, positive and negative sealing rings, and positive and negative conductive posts are positioned by a fixture, they are injection molded with plastic material. After cooling and forming, the positive and negative fixing components and the cover plate body are welded by laser welding to complete the processing of the entire cover plate assembly.

[0060] The battery cover assembly described in this embodiment is assembled as follows: the positive electrode sealing ring 104, the positive electrode fixing component 102, and the positive electrode conductive post 103 are placed at the corresponding positive electrode position of the cover body 30, and the negative electrode sealing ring 204, the negative electrode fixing component 202, and the negative electrode conductive post 203 are placed at the corresponding negative electrode position of the cover body 30. After being positioned by a fixture, the assembly is injection molded with plastic material. After the plastic material cools and solidifies, it forms the first insulating component 101 and the second insulating component 201.

[0061] The grooves (i.e., the first groove and the third groove) on the cover plate body 30 are used to place the positive and negative electrode sealing rings and the positive and negative electrode fixing components (i.e., the first fixing component 102 and the second fixing component 202). The fixing components are installed in the grooves of the cover plate body 30. Taking the position of the negative electrode post as an example, several waist-shaped fourth grooves 301 are opened in the third groove of the cover plate body 30. Corresponding to the position of the fourth grooves 301, the second fixing component 202 is provided with a waist-shaped eighth through hole 2022 of the same size. The injection molding plastic is filled from top to bottom into the second fixing component 202 and the eighth through hole 2022, the ninth through hole 2021, the tenth through hole 2023 and the fourth grooves 301 of the cover plate body 30. Figure 3 As shown, after the injection molding plastic cools and solidifies, a plastic boss 2012 is formed on the negative electrode, which fixes the second fixing member 202 to the cover plate body 30. The second fixing member 202 is also provided with a waist-shaped ninth through hole 2021 and a circular tenth through hole 2023. The plastic material fills all the gaps in the second fixing member 202 and the negative electrode conductive post through these holes. After the injection molding plastic cools and solidifies, the corresponding waist-shaped ninth through hole 2021 and circular tenth through hole 2023 of the second fixing member 202 form a plastic first boss 2011 and a plastic second boss 2013 on the negative electrode, thereby achieving complete fixation and insulation of the negative electrode conductive post 203, the second fixing member 202 and the cover plate body 30.

[0062] In one or more embodiments, the negative conductive post is provided with an anti-rotation notch 2033. After injection molding, a plastic anti-rotation boss 2014 is formed on the negative electrode at this position, thereby ensuring that the conductive post will not rotate and cause the test to fail when subjected to torque testing. Finally, laser welding is performed along the position where the second fixing member 202 mates with the cover plate body 30 to achieve double fixation of the negative electrode post 20 and the cover plate body 30.

[0063] It is understandable that the positive electrode post 10 and the negative electrode post 20 in this embodiment adopt the same design, so it will not be described again here.

[0064] In this embodiment, the battery cover assembly uses plastic injection to allow the insulating component to penetrate deep into the cover body 30, thus performing the first step of fixing the positive and negative terminals and the cover body 30. The fixing component fits into the groove of the cover body 30 and is connected and fixed by laser welding, thus performing a second fixation of the positive and negative terminals and the cover body 30. Through these two fixations, the push-pull force, torque, and sealing performance of the positive and negative terminals are further guaranteed, thereby ensuring the safety performance of the battery.

[0065] like Figure 4 As shown in the figure, this embodiment illustrates a cross-sectional view of a cover plate assembly. Meanwhile, in... Figure 5 Showing Figure 4 A magnified view of a portion of region B in the middle.

[0066] Example 2:

[0067] This embodiment provides a core carrier device, including a housing and the battery cover assembly described in Embodiment 1. The battery cover assembly is fixedly connected to the housing to form a sealed cavity for accommodating the core.

[0068] Example 3:

[0069] This embodiment provides a square battery, including the battery cover assembly described in Embodiment 1; or, including the electrode core support device described in Embodiment 2.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery cover assembly, characterized in that, At least including: The cover plate body, the first insulating component, the first fixing component, and the positive conductive post; The cover plate body has a first groove for accommodating a first fixing member. The first fixing member includes a first annular member and a second annular member. The second annular member has a first protrusion for accommodating a positive conductive post. The first groove contains a second groove, and the center of the first groove has a first through hole, and the first protrusion contains a second through hole. The first annular component is provided with a third through hole corresponding to the second groove, and the second annular component is provided with a fourth through hole in the vertical direction and a fifth through hole in the horizontal direction. The first annular component is fixedly connected to the cover plate body; The first annular component and the second annular component are fixedly connected. The first annular component fits tightly with the first groove. The first protrusion of the second annular component accommodates the positive conductive post and the sealing ring. The first insulating component achieves insulation and fixation between the cover plate body, the first fixing component, and the positive electrode conductive post through the third through hole, the fourth through hole, the fifth through hole, and the second groove.

2. The battery cover assembly as described in claim 1, characterized in that, A sealing ring is provided in the first groove.

3. The battery cover assembly as described in claim 1, characterized in that, The third and fourth through holes are oblong, the fifth through hole is circular, and the second groove is oblong.

4. A battery cover assembly as described in claim 1, characterized in that, The sealing rings are in contact with the cover plate body, the positive conductive post, the first fixing member, and the first insulating member, respectively.

5. A battery cover assembly as described in claim 1, characterized in that, It also includes a negative electrode conductive post, a second insulating component, and a second fixing component; The cover plate body has a third groove for accommodating the second fixing member. The second fixing member includes a third annular member and a fourth annular member. The fourth annular member has a second protrusion for accommodating the negative electrode conductive post. The third groove is provided with a fourth groove, and a sixth through hole is opened at the center of the third groove. A seventh through hole is opened in the second protrusion. The third ring-shaped component is provided with an eighth through hole corresponding to the fourth groove, and the fourth ring-shaped component is provided with a ninth through hole in the vertical direction and a tenth through hole in the horizontal direction. The second insulating component achieves insulation and fixation between the cover plate body, the second fixing component, and the negative electrode conductive post through the eighth through hole, the ninth through hole, the tenth through hole, and the fourth groove.

6. A battery cover assembly as described in claim 5, characterized in that, A sealing ring is installed in the third groove.

7. A battery cover assembly as described in claim 5, characterized in that, The third annular component is fixedly connected to the cover plate body.

8. A battery cover assembly as described in claim 5, characterized in that, The eighth and ninth through holes are oblong, the tenth through hole is circular, and the fourth groove is oblong.

9. A battery cover assembly as described in claim 5, characterized in that, The third annular component is fixedly connected to the fourth annular component, the third annular component fits tightly with the third groove, and the second protrusion of the fourth annular component accommodates the negative conductive post and the sealing ring.

10. A battery cover assembly as described in claim 5, characterized in that, The sealing rings are in contact with the cover plate body, the negative conductive post, the second fixing member, and the second insulating member, respectively.

11. A battery cover assembly as described in any one of claims 1-10, characterized in that, It also includes an insulating component under the cover plate, which is fixedly connected to the cover plate body.

12. A core support device, characterized in that, It includes a housing and a battery cover assembly as described in any one of claims 1-11, wherein the battery cover assembly is fixedly connected to the housing to form a sealed cavity for accommodating the electrode core.

13. A square battery, characterized in that, It includes the battery cover assembly according to any one of claims 1-11; or, it includes the electrode core support device according to claim 12.

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