Battery cell cover plate and battery cell

Abstract

The utility model provides a kind of electric core cover plate and electric core, belong to battery field, including substrate, at least one through-hole is opened in it;At least one pole post assembly, its outer circumferential ring is provided with welding ring;Wherein, the annular welding groove is opened in the outline of through-hole on the upper surface of substrate;Welding ring and welding groove shape cooperate, welding ring and welding groove are welded and make pole post assembly fixed on substrate.The utility model first assembles the components of each component of the pole group assembly into pole post integral module by stamping and integrated injection molding etc., then the pole post module is installed on cover plate by welding etc., not only greatly shorten the assembly time of cover plate, and each component of the pole post that will constitute pole group is assembled into integral module and introduced into production line as production material to assemble, greatly reduce the material waste of pole post component in production process, effectively realize the ultimate use of production material.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell cover plate and a cell. Background Technology

[0002] Currently, the demand for battery cells is expanding both domestically and internationally, and companies' battery cell production is also increasing. Therefore, with such a large shipment volume, cost control is particularly important. Reducing the cost of individual components can have a significant impact on mass production and generate substantial benefits.

[0003] Chinese patent CN120341459A discloses a battery cover plate, which includes a cover plate body, terminal posts, sealing rings, and fasteners. Currently, the processing steps for such battery cell cover plates mostly involve a combination of riveting, screw riveting, and welding, which are complex, result in high material utilization costs, and fail to achieve optimal material utilization. Utility Model Content

[0004] In view of this, the present invention proposes a cell cover plate and a cell to solve the problem that the current processing steps of cell cover plates cannot effectively make the best use of production materials.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a battery cell cover plate, including a substrate with at least one through hole; at least one electrode assembly with a welding ring arranged around its outer periphery; wherein, an annular welding groove is formed around the outline of the through hole on the upper surface of the substrate; the welding ring and the welding groove are matched in shape, and the welding ring and the welding groove are welded to fix the electrode assembly on the substrate.

[0006] Based on the above technical solutions, preferably, the electrode assembly includes a welding bracket with a through hole inside; an electrode body fitted inside the through hole; and an upper plastic layer disposed between the welding bracket and the electrode body; wherein a welding ring is disposed around the outer periphery of the welding bracket; and the through hole is aligned with the through hole.

[0007] More preferably, the pole assembly also includes a sealing ring, and a first flange is provided on the inner edge of the end of the perforation near the through hole. The first flange extends radially along the perforation, and the sealing ring is sandwiched between the end of the pole body near the substrate and the surface of the first flange away from the substrate.

[0008] In a further preferred embodiment, the electrode is formed by stacking an aluminum layer and a copper layer, with the aluminum layer disposed at the end of the electrode away from the substrate and the copper layer disposed at the end of the electrode close to the substrate.

[0009] In a further preferred embodiment, the outer peripheral wall of the electrode post is symmetrically provided with slots, and the inner peripheral wall of the upper plastic is symmetrically provided with second flanges. The second flanges are engaged in the slots and fix the electrode post in the upper plastic.

[0010] In a further preferred embodiment, the edges of the two end faces where the aluminum layer and the copper layer are joined are provided with stepped structures, and the stepped structures form a groove, so that the second flange is sandwiched between the aluminum layer and the copper layer.

[0011] More preferably, a third flange is provided on the upper surface of the welding bracket extending axially along the through hole, and the end of the third flange is bent into a hook shape; a slot is provided inside the peripheral wall of the upper plastic, the third flange is inserted into the slot, and the upper plastic is fixed on the welding bracket.

[0012] In an even more preferred embodiment, the upper plastic is filled between the welded bracket and the pole body through an integral injection molding process.

[0013] Based on the above technical solutions, preferably, a sealing ring is also included, which is disposed on the upper surface of the substrate and covers the weld area between the welding ring and the welding groove.

[0014] On the other hand, this utility model also provides a battery cell that uses the aforementioned battery cell cover plate.

[0015] The battery cell cover and battery cell of this utility model have the following advantages over the prior art: (1) In this utility model, the components that make up the electrode assembly are first assembled into an integral electrode module by means of stamping and integral injection molding, and then the electrode module is installed onto the cover plate by means of welding, which not only greatly shortens the assembly time of the cover plate, but also introduces the components that make up the electrode into the production line as production materials after assembling into an integral module, which greatly reduces the material waste of the components of the electrode in the production process and effectively realizes the ultimate utilization of production materials.

[0016] (2) The electrode assembly in this utility model is assembled from a welding bracket, upper plastic, electrode body and sealing ring. The assembly sequence of the electrode module is as follows: first, the welding bracket is made by stamping, then the sealing ring is placed in, then the electrode body is placed in, the sealing ring is fitted with the lower part of the electrode body, so that the composite plate electrode compresses the sealing ring, and then the upper plastic is connected to the welding bracket and electrode body by integral injection molding, thus realizing the assembly of the entire electrode module, laying the foundation for the ultimate utilization of the battery cell top cover production material. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a perspective view of the battery cell cover plate of this utility model; Figure 2 This is a perspective view of the battery cell cover plate of this utility model from another angle; Figure 3 This is a front sectional view of the battery cell cover plate of this utility model; Figure 4 For the present utility model Figure 3 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Substrate; 101. Through hole; 102. Solder groove; 2. Terminal assembly; 20. Solder ring; 21. Welding bracket; 211. First flange; 22. Terminal body; 221. Aluminum layer; 222. Copper layer; 23. Upper plastic; 231. Second flange; 232. Third flange; 24. Sealing ring; 201. Perforation; 202. Slot; 203. Slot; 3. Sealing ring; 4. Explosion-proof valve; 5. Lower plastic; 6. Injection hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the embodiments of the present invention 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 the embodiments of the present invention.

[0023] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0026] like Figure 1 As shown, combined with Figure 2 This utility model discloses a battery cell cover plate, comprising a substrate 1, an electrode assembly 2, and... The substrate 1 is a plain aluminum plate, and at least one through hole 101 is formed on the substrate 1. An annular solder groove 102 is formed around the outline of the through hole 101 on the upper surface of the substrate 1. The substrate 1 is also provided with a patch for the explosion-proof valve 4 and has a liquid injection hole 6.

[0027] The terminal assembly 2 passes through the through hole 101. At least one terminal assembly 2 is surrounded by a welding ring 20. For example, the top cover substrate 1 of the square-shell battery cell has two through holes 101, so there are two terminal assemblies 2, which are positive and negative terminals respectively. The welding ring 20 matches the shape of the welding groove 102, and the welding ring 20 is welded to the welding groove 102 to fix the terminal assembly 2 on the substrate 1. In this embodiment, the components that make up the battery cell terminal are assembled into an integral module, which is the terminal assembly 2. Therefore, the terminal assembly 2 is used as the production material in the production assembly, and the assembly process only requires welding the welding ring 20 of the terminal assembly 2 to the welding groove 102. Therefore, this embodiment not only greatly shortens the process steps, but also greatly reduces the material waste of the terminal components in the production process, effectively realizing the ultimate utilization of production materials. In addition, when assembling the battery cell top cover, plastic 5 is also applied to the lower surface of the substrate 1.

[0028] exist Figure 2 In one embodiment shown, the pole assembly 2 includes a welding bracket 21, a pole body 22, and an upper plastic 23.

[0029] The welding bracket 21 has a through hole 201 inside, and a welding ring 20 is arranged around the outer periphery of the welding bracket 21. The welding bracket 21 is a structure formed by stamping a plain aluminum plate.

[0030] The electrode post 22 is fitted inside the through hole 201, which is aligned with the through hole 101. The diameter of the through hole 201 is larger than the outer diameter of the electrode post 22.

[0031] The upper plastic 23 is positioned between the welding bracket 21 and the electrode post 22. The upper plastic 23 is typically filled between the two through an integral injection molding process. The top of the electrode post 22 protrudes slightly from the top of the upper plastic 23.

[0032] exist Figure 1 In one embodiment shown, the pole assembly 2 further includes a sealing ring 24. A first flange 211 is provided on the inner edge of the perforation 201 near the through hole 101, and the first flange 211 extends radially along the perforation 201. The sealing ring 24 has an insulating effect and is sandwiched between the end of the pole body 22 near the substrate 1 and the surface of the first flange 211 away from the substrate 1. The sealing ring 24 is fitted and assembled with the lower part of the pole body 22, causing the pole body 22 to compress the sealing ring 24.

[0033] exist Figure 1 In one embodiment shown, the pole post 22 is formed by stacking an aluminum layer 221 and a copper layer 222. The aluminum layer 221 is disposed at the end of the pole post 22 away from the substrate 1, and the copper layer 222 is disposed at the end of the pole post 22 close to the substrate 1. Therefore, the pole post 22 is a composite plate pole post with a copper layer thickness ≥ 2.2 mm and an aluminum layer thickness ≥ 1.2 mm.

[0034] exist Figure 2 In one embodiment shown, symmetrical slots 202 are provided on the outer peripheral wall of the electrode post 22, and symmetrical second flanges 231 are provided on the inner peripheral wall of the upper plastic 23. The second flanges 231 are engaged in the slots 202 and fix the electrode post 22 in the upper plastic 23. The thickness of the second flanges 231 is ≥0.5mm, and the second flanges 231 extend into the electrode post 22 through the slots 202 to provide axial positioning.

[0035] exist Figure 4 In one embodiment shown, the edges of the two end faces where the aluminum layer 221 and the copper layer 222 meet are respectively provided with stepped structures, which form a groove 202, so that the second flange 231 is sandwiched between the aluminum layer 221 and the copper layer 222. The copper-aluminum composite material completes the copper-aluminum transition and the fabrication of the electrode material, which can effectively reduce the complexity of subsequent processes and use relatively convenient methods such as laser welding and resistance welding to connect the electrodes.

[0036] exist Figure 4 In one embodiment shown, a third flange 232 is provided on the upper surface of the welding bracket 21 extending axially along the through hole 101, and the end of the third flange 232 is bent into a hook shape; a slot 203 is provided inside the peripheral wall of the upper plastic 23, and the third flange 232 is inserted into the slot 203, thus fixing the upper plastic 23 to the welding bracket 21. The hook-shaped end of the third flange 232 hooks onto the inner end of the slot 203, and the inner and outer sides of the upper plastic 23 are fixed to the pole piece 22 and the welding bracket 21 respectively by the second flange 231 and the third flange 232.

[0037] exist Figure 1 In one embodiment shown, the upper plastic 23 is filled between the welding bracket 21 and the pole piece 22 by integral injection molding. When assembling the finished top cover, the pole piece assembly 2 is first processed. The assembly sequence of the pole piece assembly 2 is as follows: the welding bracket 21 is first made by stamping, then the sealing ring 24 is placed in, then the pole piece 22 is placed in, and the sealing ring 24 is fitted and assembled with the lower part of the pole piece 22, so that the composite plate pole piece 22 compresses the sealing ring 24. Then the upper plastic 23 is connected to the welding bracket 21 and the composite plate pole piece 22 by integral injection molding.

[0038] exist Figure 3 In one embodiment shown, a sealing ring 3 is further included, which is disposed on the upper surface of the substrate 1 and covers the weld area between the welding ring 20 and the weld groove 102. A groove can be provided in the weld area, and the sealing ring 3 can be embedded in the groove.

[0039] like Figure 1 As shown, combined with Figure 2 The present invention provides a battery cell that uses the battery cell cover plate of any of the above embodiments.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell cover plate, characterized in that, include: A substrate (1) having at least one through hole (101) thereon. At least one pole assembly (2) has a welding ring (20) arranged around its outer periphery; Wherein, an annular solder groove (101) is formed on the upper surface of the substrate (1) around the outline of the through hole (101). The welding ring (20) is shaped to match the welding groove (101), and the welding ring (20) is welded to the welding groove (101) to fix the pole assembly (2) on the substrate (1).

2. The cell cover plate according to claim 1, characterized in that: The pole assembly (2) includes, A welding bracket (21) has a through hole (201) inside it; The pole piece (22) is fitted inside the perforation (201); Plastic (23) is placed between the welding bracket (21) and the pole piece (22); The welding ring (20) is arranged around the outer periphery of the welding bracket (21); the perforation (201) is aligned with the through hole (101).

3. A cell cover plate according to claim 2, characterized in that: The pole assembly (2) also includes a sealing ring (24). A first flange (211) is provided on the inner edge of the perforation (201) near the end of the through hole (101). The first flange (211) extends radially along the perforation (201). The sealing ring (24) is sandwiched between the end of the pole body (22) near the substrate (1) and the surface of the first flange (211) away from the substrate (1).

4. A cell cover plate according to claim 2, characterized in that: The electrode (22) is formed by stacking an aluminum layer (221) and a copper layer (222). The aluminum layer (221) is located at the end of the electrode (22) away from the substrate (1), and the copper layer (222) is located at the end of the electrode (22) close to the substrate (1).

5. A cell cover plate according to claim 4, characterized in that: The outer peripheral wall of the pole piece (22) is symmetrically provided with a slot (202), and the inner peripheral wall of the upper plastic (23) is symmetrically provided with a second flange (231). The second flange (231) is snapped into the slot (202) and fixes the pole piece (22) in the upper plastic (23).

6. A cell cover plate according to claim 5, characterized in that: The edges of the two end faces where the aluminum layer (221) and the copper layer (222) meet are provided with stepped structures and the stepped structures form the slot (202), so that the second flange (231) is sandwiched between the aluminum layer (221) and the copper layer (222).

7. A cell cover plate according to claim 2, characterized in that: The upper surface of the welding bracket (21) is provided with a third flange (232) extending axially along the through hole (101), and the end of the third flange (232) is bent into a hook shape; a slot (203) is provided inside the peripheral wall of the upper plastic (23), the third flange (232) is inserted into the slot (203), and the upper plastic (23) is fixed on the welding bracket (21).

8. A cell cover plate according to claim 2, characterized in that: The upper plastic (23) is filled between the welding bracket (21) and the pole body (22) by integral injection molding.

9. A cell cover plate according to claim 1, characterized in that: It also includes a sealing ring (3), which covers the upper surface of the substrate (1) and covers the weld area between the welding ring (20) and the weld groove (101).

10. A battery cell, characterized in that: The cell cover plate described in any one of claims 1 to 9 is used.

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