A power battery top cover, connecting piece and battery

Abstract

This application provides a technical solution for a battery top cover, a battery pack, and a method for manufacturing the same. In the battery top cover, a positive electrode post assembly passes through the top cover sheet and the positive electrode under-plastic, and is connected to a positive electrode connecting piece; a negative electrode post assembly passes through the top cover sheet and the negative electrode under-plastic, and is connected to a negative electrode connecting piece; the positive and negative electrode under-plastics are positioned opposite each other at both ends of the top cover sheet; one end of the positive electrode connecting piece is laser-welded to the positive electrode post assembly, and the other end is connected to the positive electrode under-plastic; one end of the negative electrode connecting piece is laser-welded to the negative electrode post assembly, and the other end is connected to the negative electrode under-plastic; a positive electrode arched structure is provided in the middle of both the positive and negative electrode connecting pieces. The technical solution provided by this application can improve the safety and structural stability of the battery pack.

Description

Technical Field

[0001] This invention relates to battery top covers and belongs to the field of battery manufacturing technology. This invention also relates to battery packs; and further to methods for manufacturing battery packs and their manufacturing methods. Background Technology

[0002] With environmental issues becoming increasingly prominent, people are actively advocating for a low-carbon economy. New energy vehicles are emerging due to worsening air quality. Manufacturers and consumers are gradually accepting hybrid and pure electric vehicles as representatives of new energy vehicles. As the primary power source for new energy vehicles, the power battery has become one of the core components of electric vehicles.

[0003] In most existing technologies, the positive and negative tabs of the bare battery cell are welded to the side of a connecting piece close to the bare cell, with one end of the connecting piece electrically connected to the terminal assembly and the other end suspended. This poses a risk of collapse to the connecting piece with the welded tabs and the suspended end, potentially affecting battery safety. Therefore, how to provide a battery top cover that can improve the safety and structural stability of the battery pack is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention aims to improve the safety and structural stability of the battery pack. The present invention provides a battery top cover, comprising: a positive electrode post assembly, a negative electrode post assembly, a top cover sheet, a positive electrode under-plastic, a negative electrode under-plastic, a positive electrode connecting piece, and a negative electrode connecting piece; the positive electrode post assembly passes through the top cover sheet and the positive electrode under-plastic, and is connected to the positive electrode connecting piece; the negative electrode post assembly passes through the top cover sheet and the negative electrode under-plastic, and is connected to the negative electrode connecting piece; the positive electrode under-plastic and the negative electrode under-plastic are disposed opposite to each other at both ends of the top cover sheet; wherein, one end of the positive electrode connecting piece is laser-welded to the positive electrode post assembly, and the other end of the positive electrode connecting piece is connected to the positive electrode under-plastic; one end of the negative electrode connecting piece is laser-welded to the negative electrode post assembly, and the other end of the negative electrode connecting piece is connected to the negative electrode under-plastic; a positive electrode arched structure is provided in the middle of the positive electrode connecting piece, and a negative electrode arched structure is provided in the middle of the negative electrode connecting piece.

[0005] According to a first embodiment of the present invention, a battery top cover is provided:

[0006] A battery top cover includes: a positive terminal post assembly, a negative terminal post assembly, a top cover sheet, a positive electrode lower plastic, a negative electrode lower plastic, a positive electrode connecting piece, and a negative electrode connecting piece; the positive terminal post assembly passes through the top cover sheet and the positive electrode lower plastic, and is connected to the positive electrode connecting piece; the negative terminal post assembly passes through the top cover sheet and the negative electrode lower plastic, and is connected to the negative electrode connecting piece; the positive electrode lower plastic and the negative electrode lower plastic are disposed opposite to each other at both ends of the top cover sheet; wherein, one end of the positive electrode connecting piece is connected to the positive terminal post assembly, and the other end of the positive electrode connecting piece is connected to the positive electrode lower plastic; one end of the negative electrode connecting piece is connected to the negative terminal post assembly, and the other end of the negative electrode connecting piece is connected to the negative electrode lower plastic; a positive electrode arched structure is provided in the middle of the positive electrode connecting piece, and a negative electrode arched structure is provided in the middle of the negative electrode connecting piece.

[0007] Furthermore, as a more preferred embodiment of the present invention, it further includes: an explosion-proof valve assembly; the explosion-proof valve assembly is disposed on the vent hole of the top cover plate.

[0008] Furthermore, in a more preferred embodiment of the present invention, the positive electrode connecting piece includes: a positive electrode support portion, a positive electrode tab connecting portion, and a positive electrode mounting portion; the positive electrode support portion, the positive electrode tab connecting portion, and the positive electrode mounting portion are connected in sequence; the positive electrode support portion is provided with a positive electrode through hole, and the positive electrode through hole is connected to the lower plastic of the positive electrode through a snap-fit ​​structure; the positive electrode mounting portion is provided with a positive electrode boss, and the positive electrode boss is provided with a first through hole structure for connecting to the positive electrode post assembly.

[0009] Furthermore, in a more preferred embodiment of the present invention, the positive electrode connecting piece further includes: a positive electrode bending portion; the positive electrode bending portion is disposed at both ends of the positive electrode tab connecting portion; one end of the positive electrode tab connecting portion is connected to the positive electrode support portion through the positive electrode bending portion; the other end of the positive electrode tab connecting portion is connected to the positive electrode mounting portion through the positive electrode bending portion; the positive electrode tab connecting portion and the top cover piece form a positive electrode arched structure.

[0010] Furthermore, as a more preferred embodiment of the present invention, the positive electrode connecting piece further includes: a U-shaped groove disposed at one end of the positive electrode tab connecting portion; and a protective patch disposed on the U-shaped groove.

[0011] Furthermore, in a more preferred embodiment of the present invention, the negative electrode connecting piece includes: a negative electrode support portion, a negative electrode tab connecting portion, and a negative electrode mounting portion; the negative electrode support portion, the negative electrode tab connecting portion, and the negative electrode mounting portion are connected in sequence; the negative electrode support portion is provided with a negative electrode through hole, and the negative electrode through hole is connected to the lower plastic of the negative electrode through a snap-fit ​​structure; the negative electrode mounting portion is provided with a negative electrode boss, and the negative electrode boss is provided with a second through hole structure for connecting to the negative electrode post assembly.

[0012] Furthermore, in a more preferred embodiment of the present invention, the negative electrode connecting piece further includes: a negative electrode bending portion; the negative electrode bending portion is disposed at both ends of the negative electrode tab connecting portion; one end of the negative electrode tab connecting portion is connected to the negative electrode support portion through the negative electrode bending portion; the other end of the negative electrode tab connecting portion is connected to the negative electrode mounting portion through the negative electrode bending portion; the negative electrode tab connecting portion and the top cover piece form a negative electrode arched structure.

[0013] Furthermore, in a more preferred embodiment of the present invention, a liquid injection port is provided on the lower plastic of the positive electrode; a positive electrode hook is provided on the outside of the liquid injection port, and the lower plastic of the positive electrode is connected to the positive electrode connecting piece through the positive electrode hook.

[0014] Furthermore, in a more preferred embodiment of the present invention, a negative electrode hook is provided on the lower plastic of the negative electrode, and the lower plastic of the negative electrode is connected to the negative electrode connecting piece through the negative electrode hook.

[0015] According to a second embodiment of the present invention, a battery pack is provided:

[0016] A battery pack includes: a battery top cover and bare battery cells;

[0017] The positive electrode tab of the bare battery cell is inserted into the positive electrode arched structure;

[0018] The negative electrode tab of the bare battery cell is inserted into the negative electrode arched structure.

[0019] According to a third embodiment of the present invention, a method for manufacturing a battery pack is provided:

[0020] A method for manufacturing a battery pack includes: manufacturing a top cover sheet: sequentially forming a first positive electrode mounting hole, a vent hole, a first negative electrode mounting hole, and a first liquid injection connection hole on a top cover substrate by stamping to obtain a top cover sheet; manufacturing a positive electrode under-plastic and a negative electrode under-plastic: manufacturing the positive electrode under-plastic and the negative electrode under-plastic by 3D printing or mold casting; manufacturing a positive electrode connecting piece: firstly, obtaining a positive electrode outline substrate for the positive electrode connecting piece by stamping; then, stamping a positive electrode bending portion on the positive electrode outline substrate, so that the positive electrode outline substrate forms a three-section structure of the positive electrode support portion, the positive electrode tab connection portion, and the positive electrode mounting portion; finally, stamping a U-shaped groove on the positive electrode tab connection portion; manufacturing a negative electrode connecting piece: firstly, obtaining a negative electrode outline substrate for the negative electrode connecting piece by stamping; then, stamping a negative electrode bending portion on the negative electrode outline substrate, so that the negative electrode under-plastic... The shaped substrate forms a three-section structure comprising the negative electrode support, the negative electrode tab connection, and the negative electrode mounting portion. A pre-fabricated positive electrode post assembly is laser-welded onto the top cover and connected to the lower positive electrode plastic. The pre-fabricated negative electrode post assembly is laser-welded onto the top cover and connected to the lower negative electrode plastic. The positive electrode mounting portion of the positive electrode connecting piece is connected to the bottom of the positive electrode post assembly via a ring-shaped snap-fit ​​structure, while the positive electrode support is connected to the lower positive electrode plastic snap-fit ​​via a positive electrode hook. The liquid injection port communicates with the first liquid injection connection hole. The negative electrode mounting portion of the negative electrode connecting piece is connected to the bottom of the negative electrode post assembly via a ring-shaped snap-fit ​​structure, while the negative electrode support is connected to the lower negative electrode plastic snap-fit ​​via a negative electrode hook. The positive electrode tab of the bare battery cell is welded through and through the positive electrode arched structure. The negative electrode tab of the bare battery cell is welded through and through the negative electrode arched structure.

[0021] Compared with the prior art, in the technical solution provided in this application, both the positive electrode under-plastic and the negative electrode under-plastic are disposed below the top cover sheet, and the combined positive electrode under-plastic and negative electrode under-plastic completely cover the bottom of the top cover sheet. Both the positive electrode post assembly and the negative electrode post assembly are connected to the top cover sheet, and the bottom of the positive electrode post assembly is laser-welded to the integral structure formed by the top cover sheet and the positive electrode under-plastic, and the bottom of the negative electrode post assembly is laser-welded to the integral structure formed by the top cover sheet and the negative electrode under-plastic; the positive electrode post assembly and the negative electrode post assembly are located at opposite ends of the top cover sheet. One end of the positive electrode connector is connected to the bottom of the positive electrode post assembly, and the other end is connected to the lower positive electrode plastic. The middle part of the positive electrode connector protrudes away from the top cover plate, forming a positive electrode arch structure. One end of the negative electrode connector is connected to the bottom of the negative electrode post assembly, and the other end is connected to the lower negative electrode plastic. The middle part of the negative electrode connector protrudes away from the top cover plate, forming a negative electrode arch structure. The positive electrode arch structure is used to insert the positive electrode tab of the bare battery cell, and the negative electrode arch structure is used to insert the negative electrode tab of the bare battery cell. The positive electrode connector and the lower positive electrode plastic, and the negative electrode connector and the lower negative electrode plastic, together prevent burrs generated during the installation and fixing of the positive and negative electrode tabs from affecting the bare battery cell itself, thus reducing the risks during battery installation. The technical solution provided in this application can improve the safety and structural stability of the battery pack.

[0022] Furthermore, compared with the prior art, in this invention, the tabs of the bare cell are welded to the side of the connecting piece near the top cover piece, so that the burrs generated during the welding process of the tabs and the connecting piece face away from the bare cell. This can effectively reduce the probability of burrs falling into the bare cell and puncturing the separator, thereby increasing the safety of the single battery cell.

[0023] Compared with the prior art, the connecting piece in this invention is provided with a support part, which is installed in conjunction with the liquid injection port of the lower plastic, thereby increasing the structural strength of the connecting piece and making it less likely to be stretched and deformed after the connecting piece is welded to the electrode tab, thus avoiding damage to the bare cell caused by the deformation of the connecting piece. Attached Figure Description

[0024] Figure 1 This is an exploded view of the battery top cover structure in an embodiment of the present invention;

[0025] Figure 2 This is a bottom view of the battery top cover in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram illustrating the installation and connection between the battery top cover and the bare battery cell in an embodiment of the present invention;

[0027] Figure 4 This is a top view of the positive electrode connecting piece in an embodiment of the present invention;

[0028] Figure 5This is an isometric view of the positive electrode connecting piece structure in an embodiment of the present invention;

[0029] Figure 6 This is an isometric view of the negative electrode connecting piece in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram illustrating the combination of the plastic under the positive electrode and the plastic under the negative electrode in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the injection port structure in an embodiment of the present invention;

[0032] Figure 9 This is an embodiment of the present invention.

[0033] Reference numerals: 1. Positive terminal assembly; 2. Negative terminal assembly; 3. Explosion-proof valve assembly; 4. Top cover plate; 401. Vent hole; 5. Lower plastic of positive electrode; 6. Lower plastic of negative electrode; 7. Positive electrode connecting piece; 701. Positive electrode arched structure; 8. Negative electrode connecting piece; 801. Negative electrode arched structure; 9. Bare cell; 10. Positive electrode tab; 11. Positive electrode tab; 12. Positive electrode tab connecting part; 13. Positive electrode mounting part; 14. Positive electrode boss; 15. First through hole structure 1501; U-shaped groove; 16. Positive electrode through hole; 17. Positive electrode bending part; 18. Negative electrode support part; 19. Negative electrode tab connecting part; 20. Negative electrode mounting part; 21. Negative electrode boss; 22. Second through hole structure 2201; Negative electrode bending part; 23. Negative electrode through hole; 24. Liquid injection port; 25. Negative electrode hook; 26. Positive electrode hook; 27. Protective patch; 28. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0038] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0039] According to a first embodiment of the present invention, a battery top cover is provided:

[0040] The battery top cover includes: a positive terminal post assembly 1, a negative terminal post assembly 2, a top cover sheet 4, a positive electrode lower plastic 5, a negative electrode lower plastic 6, a positive electrode connecting piece 7, and a negative electrode connecting piece 8; the positive terminal post assembly 1 passes through the top cover sheet 4 and the positive electrode lower plastic 5, and is connected to the positive electrode connecting piece 7; the negative terminal post assembly 2 passes through the top cover sheet 4 and the negative electrode lower plastic 6, and is connected to the negative electrode connecting piece 8; the positive electrode lower plastic 5 and the negative electrode lower plastic 6 are positioned opposite each other. The top cover plate 4 has two ends; one end of the positive electrode connecting piece 7 is laser-welded to the positive electrode post assembly 1, and the other end of the positive electrode connecting piece 7 is connected to the positive electrode lower plastic 5; one end of the negative electrode connecting piece 8 is laser-welded to the negative electrode post assembly 2, and the other end of the negative electrode connecting piece 8 is connected to the negative electrode lower plastic 6; the positive electrode connecting piece 7 has a positive electrode arched structure 701 in the middle, and the negative electrode connecting piece 8 has a negative electrode arched structure 801 in the middle.

[0041] This application provides a technical solution for a battery top cover. In this solution, both the positive electrode under-cover plastic and the negative electrode under-cover plastic are disposed below the top cover sheet, and the combined positive electrode under-cover plastic and negative electrode under-cover plastic completely cover the bottom of the top cover sheet. Both the positive electrode post assembly and the negative electrode post assembly are connected to the top cover sheet, and the bottom of the positive electrode post assembly is laser-welded to the integral structure formed by the top cover sheet and the positive electrode under-cover plastic, and the bottom of the negative electrode post assembly is also laser-welded to the integral structure formed by the top cover sheet and the negative electrode under-cover plastic; the positive electrode post assembly and the negative electrode post assembly are located at opposite ends of the top cover sheet. One end of the positive electrode connector is connected to the bottom of the positive electrode post assembly, and the other end is connected to the lower positive electrode plastic. The middle part of the positive electrode connector protrudes away from the top cover plate, forming a positive electrode arch structure. One end of the negative electrode connector is connected to the bottom of the negative electrode post assembly, and the other end is connected to the lower negative electrode plastic. The middle part of the negative electrode connector protrudes away from the top cover plate, forming a negative electrode arch structure. The positive electrode arch structure is used to insert the positive electrode tab of the bare battery cell, and the negative electrode arch structure is used to insert the negative electrode tab of the bare battery cell. The positive electrode connector and the lower positive electrode plastic, and the negative electrode connector and the lower negative electrode plastic, together prevent burrs generated during the installation and fixing of the positive and negative electrode tabs from affecting the bare battery cell itself, thus reducing the risks during battery installation. The technical solution provided in this application can improve the safety and structural stability of the battery pack.

[0042] It should be noted that in the existing technology, the connection position between the electrode tab and the connecting piece of the bare cell is located between the connecting piece and the bare cell. This means that burrs or protrusions generated during the electrode tab welding and installation process will affect the safety of the bare cell. If the burrs or protrusions are embedded in the bare cell, they will cause an internal short circuit, resulting in cell combustion and damage.

[0043] It should be further explained that in existing technologies, in order to speed up the assembly of bare cells and battery top covers, the tabs of the bare cells are usually directly connected to the electrode connecting pieces. The tabs are located between the connecting pieces and the bare cells, which compromises the safety of the cells. Existing technologies, in order to accelerate battery assembly, have ignored this problem.

[0044] It should be further explained that, in the technical solution of this application, both ends of the connecting piece are connected to the electrode post assembly and the lower electrode plastic on the top cover of the battery, which ensures the stability of the connecting piece and prevents it from being embedded in the bare cell due to problems such as the connecting piece lifting up, thereby endangering the safety of the bare cell.

[0045] Specifically, in this embodiment of the invention, it further includes: an explosion-proof valve assembly 3; the explosion-proof valve assembly 3 is disposed on the vent hole 401 of the top cover plate 4.

[0046] It should be noted that the explosion-proof valve assembly can effectively control and release the high-pressure gas generated after the battery cell is damaged, thus preventing the battery from exploding to a certain extent.

[0047] Specifically, in this embodiment of the present invention, the positive electrode connecting piece 7 includes: a positive electrode support portion 12, a positive electrode tab connecting portion 13, and a positive electrode mounting portion 14; the positive electrode support portion 12, the positive electrode tab connecting portion 13, and the positive electrode mounting portion 14 are connected in sequence; the positive electrode support portion 12 is provided with a positive electrode through hole 17, and the positive electrode through hole 17 is connected to the lower positive electrode plastic 5 through a snap-fit ​​structure; the positive electrode mounting portion 14 is provided with a positive electrode boss 15, and the positive electrode boss 15 is provided with a first through hole structure 1501 connected to the positive electrode post assembly 1.

[0048] It should be noted that the positive electrode connector, through the positive electrode support and positive electrode mounting parts, can be stably connected to the top cover plate, preventing the connector from tilting and affecting production / use safety. The positive electrode boss effectively improves the connection stability between the positive electrode connector and the positive electrode post assembly.

[0049] Specifically, in this embodiment of the present invention, the positive electrode connecting piece 7 further includes: a positive electrode bending portion 18; the positive electrode bending portion 18 is disposed at both ends of the positive electrode tab connecting portion 13; one end of the positive electrode tab connecting portion 13 is connected to the positive electrode support portion 12 through the positive electrode bending portion 18; the other end of the positive electrode tab connecting portion 13 is connected to the positive electrode mounting portion 14 through the positive electrode bending portion 18; the positive electrode tab connecting portion 13 and the top cover piece 4 form a positive electrode arched structure 701.

[0050] It should be noted that the positive electrode bending section can form a stable positive electrode arch structure on the connecting piece, thereby improving the quality and efficiency of positive electrode tab installation.

[0051] Specifically, in this embodiment of the present invention, the positive electrode connecting piece 7 further includes: a U-shaped groove 16 disposed at one end of the positive electrode tab connecting portion 13; and a protective patch 28 disposed on the U-shaped groove 16.

[0052] It should be noted that installing the protective patch through the U-shaped groove improves the installation stability of the protective patch.

[0053] Specifically, in this embodiment of the present invention, the negative electrode connecting piece 8 includes: a negative electrode support part 19, a negative electrode tab connecting part 20, and a negative electrode mounting part 21; the negative electrode support part 19, the negative electrode tab connecting part 20, and the negative electrode mounting part 21 are connected in sequence; the negative electrode support part 19 is provided with a negative electrode through hole 24, and the negative electrode through hole 24 is connected to the lower plastic part 6 of the negative electrode through a snap-fit ​​structure; the negative electrode mounting part 21 is provided with a negative electrode boss 22, and the negative electrode boss 22 is provided with a second through hole structure 2201 connected to the negative electrode post assembly 2.

[0054] It should be noted that the negative electrode connector, through the negative electrode support and negative electrode mounting parts, can be stably connected to the top cover plate, preventing the connector from tilting and affecting production / use safety. The negative electrode boss effectively improves the connection stability between the negative electrode connector and the negative electrode post assembly.

[0055] Specifically, in this embodiment of the present invention, the negative electrode connecting piece 8 further includes: a negative electrode bending portion 23; the negative electrode bending portion 23 is disposed at both ends of the negative electrode tab connecting portion 20; one end of the negative electrode tab connecting portion 20 is connected to the negative electrode support portion 19 through the negative electrode bending portion 23; the other end of the negative electrode tab connecting portion 20 is connected to the negative electrode mounting portion 21 through the negative electrode bending portion 23; the negative electrode tab connecting portion 20 and the top cover piece 4 form a negative electrode arched structure 801.

[0056] It should be noted that the negative electrode bending section can form a stable negative electrode arch structure on the connecting piece, improving the quality and efficiency of negative electrode tab installation.

[0057] Specifically, in this embodiment of the present invention, a liquid injection port 25 is provided on the lower plastic 5 of the positive electrode; a positive electrode hook 27 is provided on the outside of the liquid injection port 25, and the lower plastic 5 of the positive electrode is connected to the positive electrode connecting piece 7 through the positive electrode hook 27.

[0058] It should be noted that connecting the positive electrode connector and the lower plastic part of the positive electrode with the positive electrode hook improves the installation efficiency of the positive electrode connector.

[0059] Specifically, in this embodiment of the invention, a negative electrode hook 26 is provided on the lower plastic 6 of the negative electrode, and the lower plastic 6 of the negative electrode is connected to the negative electrode connecting piece 8 through the negative electrode hook 26.

[0060] It should be noted that connecting the negative electrode connector and the lower plastic part of the negative electrode with the negative electrode hook improves the installation efficiency of the negative electrode connector.

[0061] According to a second embodiment of the present invention, a battery pack is provided:

[0062] A battery pack includes: a battery top cover and bare battery cells 9;

[0063] The positive electrode tab 10 of the bare cell 9 is inserted into the positive electrode arched structure 701;

[0064] The negative electrode tab 11 of the bare cell 9 is inserted into the negative electrode arched structure 801.

[0065] This application also provides a battery pack technical solution. The battery pack obtained by this technical solution will have a safer use effect because the positive electrode tab, negative electrode tab, and connecting piece are properly fixed and installed, eliminating the risk of bare cells being punctured by connecting pieces or tabs, and improving the safety of the battery pack.

[0066] According to a third embodiment of the present invention, a method for manufacturing a battery pack is provided:

[0067] A method for manufacturing a battery pack, the method comprising: manufacturing a top cover sheet 4: sequentially forming a first positive electrode mounting hole, a vent hole, a first negative electrode mounting hole, and a first electrolyte injection connection hole on a top cover substrate by stamping, thereby obtaining the top cover sheet 4; manufacturing a positive electrode under-plastic 5 and a negative electrode under-plastic 6: manufacturing the positive electrode under-plastic 5 and the negative electrode under-plastic 6 by 3D printing or mold casting; manufacturing a positive electrode connecting sheet 7: firstly, obtaining the positive electrode outline substrate of the positive electrode connecting sheet 7 by stamping; then, by stamping, forming the positive electrode outline substrate... A positive electrode bending portion 18 is stamped onto the substrate, forming a three-section structure of the positive electrode support portion 12, the positive electrode tab connection portion 13, and the positive electrode mounting portion 14. Finally, a U-shaped groove 16 is stamped onto the positive electrode tab connection portion 13. The negative electrode connecting piece 8 is then fabricated: first, the negative electrode outline substrate of the negative electrode connecting piece 8 is obtained by stamping; then, a negative electrode bending portion 23 is stamped onto the negative electrode outline substrate, forming the three-section structure of the positive electrode support portion 12, the positive electrode tab connection portion 13, and the positive electrode mounting portion 14. The structure comprises a three-section form consisting of a positive electrode support 19, a negative electrode tab connection 20, and a negative electrode mounting part 21. A prefabricated positive electrode post assembly 1 is laser-welded onto the top cover plate 4 and connected to the lower positive electrode plastic 5. A prefabricated negative electrode post assembly 2 is laser-welded onto the top cover plate 4 and connected to the lower negative electrode plastic 6. The positive electrode mounting part 14 of the positive electrode connecting piece 7 is connected to the bottom of the positive electrode post assembly 1 via a ring-shaped snap-fit ​​structure. Simultaneously, the positive electrode support 12 is connected via a ring-shaped snap-fit ​​structure. The electrode hook 27 is snapped to the lower plastic 5 of the positive electrode, and the liquid injection port 25 is connected to the first liquid injection connection hole; the negative electrode mounting part 21 of the negative electrode connecting piece 8 is connected and installed at the bottom of the negative electrode post assembly 2 through a ring snap structure, and the negative electrode support part 19 is snapped to the lower plastic 6 of the negative electrode through the negative electrode hook 26; the positive electrode tab 10 of the bare cell 9 is passed through and welded in the positive electrode arched structure 701; the negative electrode tab 11 of the bare cell 9 is passed through and welded in the negative electrode arched structure 801.

[0068] This application also provides a technical solution for a battery pack manufacturing method, which is specifically used for the connection between the battery top cover and the bare cell in this application, and can improve the stability and installation speed of the battery top cover and the bare cell.

[0069] Example 1

[0070] The battery top cover includes: a positive terminal post assembly 1, a negative terminal post assembly 2, a top cover sheet 4, a positive electrode lower plastic 5, a negative electrode lower plastic 6, a positive electrode connecting piece 7, and a negative electrode connecting piece 8; the positive terminal post assembly 1 passes through the top cover sheet 4 and the positive electrode lower plastic 5, and is connected to the positive electrode connecting piece 7; the negative terminal post assembly 2 passes through the top cover sheet 4 and the negative electrode lower plastic 6, and is connected to the negative electrode connecting piece 8; the positive electrode lower plastic 5 and the negative electrode lower plastic 6 are positioned opposite each other. The top cover plate 4 has two ends; one end of the positive electrode connecting piece 7 is laser-welded to the positive electrode post assembly 1, and the other end of the positive electrode connecting piece 7 is connected to the positive electrode lower plastic 5; one end of the negative electrode connecting piece 8 is laser-welded to the negative electrode post assembly 2, and the other end of the negative electrode connecting piece 8 is connected to the negative electrode lower plastic 6; the positive electrode connecting piece 7 has a positive electrode arched structure 701 in the middle, and the negative electrode connecting piece 8 has a negative electrode arched structure 801 in the middle.

[0071] Example 2

[0072] The embodiment 1 is repeated, except that it further includes: an explosion-proof valve assembly 3; the explosion-proof valve assembly 3 is disposed on the vent hole 401 of the top cover plate 4.

[0073] Example 3

[0074] The embodiment 1 is repeated, except that the positive electrode connecting piece 7 includes: a positive electrode support part 12, a positive electrode tab connecting part 13, and a positive electrode mounting part 14; the positive electrode support part 12, the positive electrode tab connecting part 13, and the positive electrode mounting part 14 are connected in sequence; the positive electrode support part 12 is provided with a positive electrode through hole 17, and the positive electrode through hole 17 is connected to the lower positive electrode plastic 5 through a snap-fit ​​structure; the positive electrode mounting part 14 is provided with a positive electrode boss 15, and the positive electrode boss 15 is provided with a first through hole structure 1501 connected to the positive electrode post assembly 1.

[0075] Example 4

[0076] Repeating Embodiment 3, except that the positive electrode connecting piece 7 further includes: a positive electrode bending portion 18; the positive electrode bending portion 18 is disposed at both ends of the positive electrode tab connecting portion 13; one end of the positive electrode tab connecting portion 13 is connected to the positive electrode support portion 12 through the positive electrode bending portion 18; the other end of the positive electrode tab connecting portion 13 is connected to the positive electrode mounting portion 14 through the positive electrode bending portion 18; the positive electrode tab connecting portion 13 and the top cover piece 4 form a positive electrode arched structure 701.

[0077] Example 5

[0078] The embodiment 4 is repeated, except that the positive electrode connecting piece 7 further includes: a U-shaped groove 16 disposed at one end of the positive electrode tab connecting portion 13; and a protective patch 28 disposed on the U-shaped groove 16.

[0079] Example 6

[0080] The embodiment 1 is repeated, except that the negative electrode connecting piece 8 includes: a negative electrode support part 19, a negative electrode tab connecting part 20, and a negative electrode mounting part 21; the negative electrode support part 19, the negative electrode tab connecting part 20, and the negative electrode mounting part 21 are connected in sequence; the negative electrode support part 19 is provided with a negative electrode through hole 24, and the negative electrode through hole 24 is connected to the lower plastic part 6 of the negative electrode through a snap-fit ​​structure; the negative electrode mounting part 21 is provided with a negative electrode boss 22, and the negative electrode boss 22 is provided with a second through hole structure 2201 connected to the negative electrode post assembly 2.

[0081] Example 7

[0082] Repeating Embodiment 6, except that the negative electrode connecting piece 8 further includes: a negative electrode bending portion 23; the negative electrode bending portion 23 is disposed at both ends of the negative electrode tab connecting portion 20; one end of the negative electrode tab connecting portion 20 is connected to the negative electrode support portion 19 through the negative electrode bending portion 23; the other end of the negative electrode tab connecting portion 20 is connected to the negative electrode mounting portion 21 through the negative electrode bending portion 23; the negative electrode tab connecting portion 20 and the top cover piece 4 form a negative electrode arched structure 801.

[0083] Example 8

[0084] The embodiment 1 is repeated, except that a liquid injection port 25 is provided on the lower plastic 5 of the positive electrode; a positive electrode hook 27 is provided on the outside of the liquid injection port 25, and the lower plastic 5 of the positive electrode is connected to the positive electrode connecting piece 7 through the positive electrode hook 27.

[0085] Example 9

[0086] The embodiment 1 is repeated, except that a negative electrode hook 26 is provided on the lower plastic 6 of the negative electrode, and the lower plastic 6 of the negative electrode is connected to the negative electrode connecting piece 8 through the negative electrode hook 26.

[0087] Example 10

[0088] A battery pack includes: a battery top cover and bare battery cells 9;

[0089] The positive electrode tab 10 of the bare cell 9 is inserted into the positive electrode arched structure 701;

[0090] The negative electrode tab 11 of the bare cell 9 is inserted into the negative electrode arched structure 801.

[0091] Example 11

[0092] A method for manufacturing a battery pack, the method comprising: manufacturing a top cover sheet 4: sequentially forming a first positive electrode mounting hole, a vent hole, a first negative electrode mounting hole, and a first electrolyte injection connection hole on a top cover substrate by stamping, thereby obtaining the top cover sheet 4; manufacturing a positive electrode under-plastic 5 and a negative electrode under-plastic 6: manufacturing the positive electrode under-plastic 5 and the negative electrode under-plastic 6 by 3D printing or mold casting; manufacturing a positive electrode connecting sheet 7: firstly, obtaining the positive electrode outline substrate of the positive electrode connecting sheet 7 by stamping; then, by stamping, forming the positive electrode outline substrate... A positive electrode bending portion 18 is stamped onto the substrate, forming a three-section structure of the positive electrode support portion 12, the positive electrode tab connection portion 13, and the positive electrode mounting portion 14. Finally, a U-shaped groove 16 is stamped onto the positive electrode tab connection portion 13. The negative electrode connecting piece 8 is then fabricated: first, the negative electrode outline substrate of the negative electrode connecting piece 8 is obtained by stamping; then, a negative electrode bending portion 23 is stamped onto the negative electrode outline substrate, forming the three-section structure of the positive electrode support portion 12, the positive electrode tab connection portion 13, and the positive electrode mounting portion 14. The structure comprises a three-section form consisting of a positive electrode support 19, a negative electrode tab connection 20, and a negative electrode mounting part 21. A prefabricated positive electrode post assembly 1 is laser-welded onto the top cover plate 4 and connected to the lower positive electrode plastic 5. A prefabricated negative electrode post assembly 2 is laser-welded onto the top cover plate 4 and connected to the lower negative electrode plastic 6. The positive electrode mounting part 14 of the positive electrode connecting piece 7 is connected to the bottom of the positive electrode post assembly 1 via a ring-shaped snap-fit ​​structure. Simultaneously, the positive electrode support 12 is connected via a ring-shaped snap-fit ​​structure. The electrode hook 27 is snapped to the lower plastic 5 of the positive electrode, and the liquid injection port 25 is connected to the first liquid injection connection hole; the negative electrode mounting part 21 of the negative electrode connecting piece 8 is connected and installed at the bottom of the negative electrode post assembly 2 through a ring snap structure, and the negative electrode support part 19 is snapped to the lower plastic 6 of the negative electrode through the negative electrode hook 26; the positive electrode tab 10 of the bare cell 9 is passed through and welded in the positive electrode arched structure 701; the negative electrode tab 11 of the bare cell 9 is passed through and welded in the negative electrode arched structure 801.

[0093] It should be noted that:

[0094] like Figure 1The diagram shows a schematic of the structure of a power battery top cover, connecting piece, and battery mentioned in this invention. The positive electrode assembly 1 passes through the positive electrode through-hole of the top cover 4 and the through-hole of the positive electrode lower plastic 5, and the positive electrode assembly 1, the positive electrode lower plastic 5, and the top cover 4 are laser-welded together. The negative electrode assembly 2 passes through the negative electrode through-hole of the top cover 4 and the through-hole of the negative electrode lower plastic 6, and the negative electrode assembly 2, the negative electrode lower plastic 6, and the top cover 4 are laser-welded together. The explosion-proof valve assembly 3 is fixed to the upper and lower surfaces of the vent hole of the top cover 4. The positive electrode mounting part 14 of the positive electrode connecting piece 7 is electrically connected to the lower end of the positive electrode assembly 1, and the positive electrode support part 12 of the positive electrode connecting piece 7 is fixed to the liquid injection assembly of the positive electrode lower plastic 5. The negative electrode mounting part 21 of the negative electrode connecting piece 8 is electrically connected to the lower end of the negative electrode assembly 2, and the negative electrode support part 19 of the negative electrode connecting piece 8 is fixed to the negative electrode lower plastic 6.

[0095] like Figure 2 The image shown is a bottom view of a power battery top cover, connecting piece, and battery mentioned in this invention.

[0096] like Figure 3 The diagram shows a schematic of the structure of a power battery top cover, connecting piece, and battery mentioned in this invention. The bare cell 9 is divided into two parts, left and right. The upper end of the bare cell 9 is provided with a positive electrode tab 10 and a negative electrode tab 11. The positive electrode tab 10 is placed on the side of the positive electrode connecting piece 7 near the top cover piece 4 and is fixed together by electrical connection. The negative electrode tab 11 is placed on the side of the negative electrode connecting piece 8 near the top cover piece 4 and is fixed together by electrical connection.

[0097] like Figure 4 and Figure 5The figures shown are a top view and an isometric view of a power battery top cover, a connecting piece, and a positive electrode connecting piece mentioned in this invention. The positive electrode connecting piece 7 consists of a positive electrode mounting part 14, a positive electrode tab connecting part 13, and a positive electrode support part 12. The positive electrode mounting part 14 has a downward positive electrode boss 15 in the middle, and a through hole in the middle of the positive electrode boss 15. The positive electrode boss 15 cooperates with the lower surface of the positive electrode post assembly 1. A U-shaped groove 16 is provided on the side of the positive electrode mounting part 14 near the positive electrode tab connecting part 13. The U-shaped groove 16 can also be rectangular or circular, or it can be omitted depending on the actual situation of the battery. A protective patch 28 is provided on the upper surface of the U-shaped groove 16. The material of the protective patch 28 is PET. The positive electrode mounting part 14 is electrically connected to the lower surface of the positive electrode post assembly 1; the positive electrode support part 12 is provided with a positive electrode through hole 17 in the middle, the positive electrode through hole 17 passes through the positive electrode hook 27 of the liquid injection port 25 of the lower positive electrode plastic 5 and is fixedly connected by a buckle; the positive electrode tab connection part 13 is divided into left and right parts and is U-shaped in general; the positive electrode support part 12 and the positive electrode tab connection part 13 are provided with a positive electrode bending part 18 in the middle, the positive electrode tab connection part 13 and the positive electrode mounting part 14 are provided with a positive electrode bending part 18 in the middle, and the upper surface of the positive electrode tab connection part 13 is higher than the upper surface of the positive electrode mounting part 14 and the upper surface of the positive electrode support part 12.

[0098] like Figure 6 The diagram shows a schematic of the structure of a power battery top cover, connecting piece, and negative electrode connecting piece 8 mentioned in this invention. The negative electrode connecting piece 8 consists of a negative electrode mounting part 21, a negative electrode tab connecting part 20, and a negative electrode support part 19. The negative electrode mounting part 21 has a downward-facing negative electrode protrusion 22 in the middle, and a through hole in the middle of the negative electrode protrusion 22. The negative electrode protrusion 22 mates with the lower surface of the negative electrode post assembly 2, and the negative electrode mounting part 21 is electrically connected to the lower surface of the negative electrode post assembly 2. The negative electrode support part 19 has a central portion... The negative electrode through hole 24 passes through the negative electrode hook 26 that matches the lower plastic 6 of the negative electrode and is fixedly connected by a buckle; the negative electrode tab connection part 20 is divided into left and right parts and is U-shaped in general; a negative electrode bending part 23 is provided between the negative electrode support part 19 and the negative electrode tab connection part 20, and a negative electrode bending part 23 is provided between the negative electrode tab connection part 20 and the negative electrode mounting part 21; the upper surface of the negative electrode tab connection part 20 is higher than the upper surface of the negative electrode mounting part 21 and the upper surface of the negative electrode support part 19.

[0099] like Figure 7 and Figure 8The diagram shows a schematic of the structure of a power battery top cover, connecting piece, and the positive electrode lower plastic 5 and negative electrode lower plastic 6 of the battery mentioned in this invention. The positive electrode lower plastic 5 is provided with an injection port 25, and a ring of positive electrode hooks 27 is provided around the injection port 25. The positive electrode hooks 27 can be a complete ring or several rings. The negative electrode lower plastic 6 is provided with a ring of negative electrode hooks 26 where it mates with the negative electrode connecting piece 8. The negative electrode hooks 26 can be a complete ring or several rings.

[0100] like Figure 9 As shown, there are other structural forms of the positive electrode connecting piece 7, in which the positive electrode mounting part 14 and the positive electrode support part 12 are integrally formed without any partition in the middle, and the positive electrode tab connecting parts 13 are distributed on both sides of the positive electrode mounting part 14 and are connected to 18 by the positive electrode bending part respectively.

[0101] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery top cover, characterized in that, include: Positive electrode post assembly (1), negative electrode post assembly (2), top cover plate (4), positive electrode lower plastic (5), negative electrode lower plastic (6), positive electrode connecting plate (7) and negative electrode connecting plate (8); The positive electrode post assembly (1) passes through the top cover plate (4) and the lower positive electrode plastic (5), and is connected to the positive electrode connecting piece (7); The negative electrode post assembly (2) passes through the top cover plate (4) and the negative electrode lower plastic (6), and is connected to the negative electrode connecting piece (8); The positive electrode lower plastic (5) and the negative electrode lower plastic (6) are disposed opposite to each other at both ends of the top cover plate (4); One end of the positive electrode connecting piece (7) is laser welded to the positive electrode post assembly (1), and the other end of the positive electrode connecting piece (7) is connected to the positive electrode lower plastic (5); One end of the negative electrode connecting piece (8) is laser welded to the negative electrode post assembly (2), and the other end of the negative electrode connecting piece (8) is connected to the negative electrode lower plastic (6); The positive electrode connecting piece (7) has a positive electrode arched structure (701) in the middle, and the negative electrode connecting piece (8) has a negative electrode arched structure (801) in the middle. The positive electrode connecting piece (7) includes: a positive electrode support part (12), a positive electrode tab connecting part (13), and a positive electrode mounting part (14); The positive electrode support (12), the positive electrode tab connection (13), and the positive electrode mounting part (14) are connected in sequence; The positive electrode support part (12) is provided with a positive electrode through hole (17), and the positive electrode through hole (17) is connected to the lower plastic part (5) of the positive electrode through a snap-fit ​​structure; The positive electrode mounting part (14) is provided with a positive electrode boss (15), and the positive electrode boss (15) is provided with a first through hole structure (1501) connected to the positive electrode post assembly (1); The negative electrode connecting piece (8) includes: a negative electrode support part (19), a negative electrode tab connecting part (20), and a negative electrode mounting part (21); The negative electrode support (19), the negative electrode tab connection (20), and the negative electrode mounting part (21) are connected in sequence; The negative electrode support part (19) is provided with a negative electrode through hole (24), and the negative electrode through hole (24) is connected to the lower plastic part (6) of the negative electrode through a snap-fit ​​structure; The negative electrode mounting part (21) is provided with a negative electrode boss (22), and the negative electrode boss (22) is provided with a second through hole structure (2201) connected to the negative electrode post assembly (2); The tabs of the bare cell (9) are welded to the side of the connecting piece near the top cover plate (4).

2. The battery top cover according to claim 1, characterized in that, Also includes: Explosion-proof valve assembly (3); The explosion-proof valve assembly (3) is disposed on the vent hole (401) of the top cover plate (4).

3. The battery top cover according to claim 1, characterized in that, The positive electrode connecting piece (7) further includes: a positive electrode bending portion (18); The positive electrode bending portion (18) is disposed at both ends of the positive electrode tab connection portion (13); One end of the positive electrode tab connection part (13) is connected to the positive electrode support part (12) through the positive electrode bending part (18); The other end of the positive electrode tab connection part (13) is connected to the positive electrode mounting part (14) through the positive electrode bending part (18); The positive electrode tab connection (13) and the top cover plate (4) form a positive electrode arched structure (701).

4. The battery top cover according to claim 3, characterized in that, The positive electrode connecting piece (7) further includes: a U-shaped groove (16) disposed at one end of the positive electrode tab connecting part (13); Protective patch (28) is disposed on the U-shaped groove (16).

5. The battery top cover according to claim 1, characterized in that, The negative electrode connecting piece (8) further includes: a negative electrode bending portion (23); The negative electrode bending portion (23) is disposed at both ends of the negative electrode tab connection portion (20); One end of the negative electrode tab connection part (20) is connected to the negative electrode support part (19) through the negative electrode bending part (23); The other end of the negative electrode tab connection part (20) is connected to the negative electrode mounting part (21) through the negative electrode bending part (23); The negative electrode tab connection (20) and the top cover plate (4) form a negative electrode arched structure (801).

6. The battery top cover according to any one of claims 1-5, characterized in that, The lower plastic of the positive electrode (5) is provided with a liquid injection port (25); a positive electrode hook (27) is provided on the outside of the liquid injection port (25), and the lower plastic of the positive electrode (5) is connected to the positive electrode connecting piece (7) through the positive electrode hook (27); A negative electrode hook (26) is provided on the lower plastic of the negative electrode (6), and the lower plastic of the negative electrode (6) is connected to the negative electrode connecting piece (8) through the negative electrode hook (26).

7. A battery pack, characterized in that, include: The battery top cover and bare cell (9) as described in any one of claims 1-6; The positive electrode tab (10) of the bare cell (9) is inserted into the positive electrode arched structure (701); The negative electrode tab (11) of the bare cell (9) is inserted into the negative electrode arched structure (801).

8. A method for manufacturing a battery pack, characterized in that, The method includes: Fabrication of top cover plate (4): The first positive electrode mounting hole, the vent hole, the first negative electrode mounting hole and the first liquid injection connection hole are sequentially set on the top cover substrate by stamping to obtain the top cover plate (4); The positive electrode plastic (5) and the negative electrode plastic (6) are made by 3D printing or mold casting. Fabrication of the positive electrode connector (7): First, the positive electrode outline substrate of the positive electrode connector (7) is obtained by stamping; then, the positive electrode bending part (18) is stamped on the positive electrode outline substrate by stamping, so that the positive electrode outline substrate forms a three-section structure of positive electrode support part (12), positive electrode tab connection part (13), and positive electrode mounting part (14); finally, the U-shaped groove (16) is stamped on the positive electrode tab connection part (13) by stamping. Fabrication of negative electrode connecting piece (8): First, the negative electrode outline substrate of negative electrode connecting piece (8) is obtained by stamping; then, the negative electrode bending part (23) is stamped on the negative electrode outline substrate by stamping, so that the negative electrode outline substrate forms a three-section structure of negative electrode support part (19), negative electrode ear connecting part (20), and negative electrode mounting part (21). The prefabricated positive electrode post assembly (1) is installed on the top cover plate (4) by laser welding and connected to the lower plastic of the positive electrode (5); The prefabricated negative electrode post assembly (2) is installed on the top cover plate (4) by laser welding and connected to the negative electrode lower plastic (6); The positive electrode mounting part (14) of the positive electrode connecting piece (7) is connected and installed at the bottom of the positive electrode post assembly (1) through a ring buckle structure. At the same time, the positive electrode support part (12) is connected to the lower plastic part (5) of the positive electrode through the positive electrode hook (27). The liquid injection port (25) is connected to the first liquid injection connection hole. The negative electrode mounting part (21) of the negative electrode connecting piece (8) is connected and installed at the bottom of the negative electrode post assembly (2) through a ring buckle structure, and the negative electrode support part (19) is connected to the negative electrode lower plastic (6) through a negative electrode hook (26). The tabs of the bare cell (9) are welded to the side of the connecting piece near the top cover plate (4); The positive electrode tab (10) of the bare cell (9) is inserted and welded into the positive arched structure (701); the negative electrode tab (11) of the bare cell (9) is inserted and welded into the negative arched structure (801).

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