Battery cover plate connecting structure and battery cell

Abstract

The utility model belongs to the related technical field of electric core, especially, relate to a battery cover plate connecting structure and electric core. Through electric core connecting plate is provided with first tab welding area, is provided with nickel sheet on first tab welding area, nickel sheet is provided with first part, second part, first part is welded on first tab welding area, and battery protection board is set from top to bottom by welding plate, combination board and bottom plate, is provided with second tab welding area on welding plate, and second tab welding area is welded through second part. In order to reduce the use of nickel sheet, thereby only through a piece of nickel sheet connection and improve production efficiency, reduce the process of production, and through single nickel sheet connection, improve the reliability of electric core on battery protection board.

Description

Technical Field

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

[0002] The cell protection board is a core safety component in lithium battery packs, used to monitor and manage the battery's operating status and prevent safety hazards to the battery pack caused by cell abnormalities.

[0003] In existing technologies, when connecting a battery protection board to a battery cell, a nickel strip is typically used to connect it to the cell's tabs. The connection method involves placing one nickel strip on the battery protection board and another nickel strip at the cell's tab; the two nickel strips are then connected to each other to establish the connection between the battery protection board and the battery cell.

[0004] This connection method results in more production steps, leading to low production efficiency. Furthermore, the flexible connection between the two nickel sheets after production may cause the battery protection board and the battery cell to have low connection reliability and be prone to detachment. Therefore, the existing connection method cannot meet the requirements for high efficiency, speed and high reliability in product production. Utility Model Content

[0005] To address the problems of low production efficiency, long production process, and low reliability caused by the connection of the cell protection board and the cell via double nickel sheets in the existing technology, this utility model proposes a battery cover connection structure and a cell.

[0006] The objective of this utility model is achieved through the following technical solution: In a first aspect, this utility model proposes a battery cover connection structure, comprising: The cell connection board includes a first tab welding area, on which a nickel sheet is disposed. The nickel sheet has a first portion and a second portion, with the first portion welded to the first tab welding area. The battery protection board is composed of a welding plate, a combination plate, and a base plate from top to bottom. The welding plate has a second tab welding area, which is connected by spot welding in the second part.

[0007] The cell connection plate has a first tab welding area, on which a nickel sheet is mounted. The nickel sheet has a first part and a second part, with the first part welded to the first tab welding area. The battery protection plate, arranged from top to bottom, consists of a welding plate, a combination plate, and a base plate. The welding plate has a second tab welding area, which is welded to the second part. This reduces the use of nickel sheets, improving production efficiency and streamlining the production process by connecting only one nickel sheet. Furthermore, the reliability of the cell to the battery protection plate is improved through a single nickel sheet connection.

[0008] In some embodiments, the composite board includes, from top to bottom, a first metal layer, a composite core board layer, and a second metal layer.

[0009] In some embodiments, a third metal layer is provided in the welding area of ​​the second electrode tab, and the third metal layer is connected to the first metal layer.

[0010] In some embodiments, a first thick copper layer is provided on the side of the first metal layer of the composite board corresponding to the second tab welding area near the composite core board layer, and / or a second thick copper layer is provided on the side of the second metal layer of the composite board corresponding to the second tab welding area near the composite core board layer.

[0011] In some implementations, the combined thickness of the first thick copper layer and the first metal layer is at least greater than 180 μm.

[0012] In some implementations, the combined thickness of the second thick copper layer and the second metal layer is at least greater than 180 μm.

[0013] In some embodiments, the thickness of the first metal layer and the second metal layer is 155 μm.

[0014] In some embodiments, the cell connection board includes a first device welding area, and the battery protection board includes a second device welding area. The first device welding area and the second device welding area are aligned and the device is disposed between the first device welding area and the second device welding area.

[0015] In some implementations, the area of ​​the second electrode welding area is larger than the area of ​​the second portion.

[0016] Secondly, this utility model also proposes a battery cell, including a battery cover connection structure as described in any of the first aspects, wherein the battery cover connection structure is disposed on the top of the battery cell body.

[0017] The beneficial effects of this utility model's battery cover connection structure and battery cell are: The cell connection plate has a first tab welding area, on which a nickel sheet is mounted. The nickel sheet has a first part and a second part, with the first part welded to the first tab welding area. The battery protection plate, arranged from top to bottom, consists of a welding plate, a combination plate, and a base plate. The welding plate has a second tab welding area, which is welded to the second part. This reduces the use of nickel sheets, improving production efficiency and streamlining the production process by connecting only one nickel sheet. Furthermore, the reliability of the cell to the battery protection plate is improved through a single nickel sheet connection. Attached Figure Description

[0018] Figure 1 This is a perspective view of a battery cover connection structure according to the present invention; Figure 2 This is a top view of a battery protective cover with a battery cover connection structure according to the present invention; Figure 3 This is a side sectional view of a battery protective cover with a battery cover connection structure according to this utility model. Figure 4 This is a flowchart illustrating the manufacturing process of a battery protective cover with a battery cover connection structure according to this utility model.

[0019] Figure label: 1. Cell connecting plate; 11. Nickel sheet; 111. First part; 112. Second part; 2. Battery protection board; 21. Second tab welding area; 211. Third metal layer; 22. Welding board; 23. Composite board; 231. First metal layer; 232. Composite core board layer; 233. Second metal layer; 234. First thick copper layer; 235. Second thick copper layer; 24. Base plate; 25. Second device welding area. Detailed implementation method: It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of this utility model can be combined with each other. The detailed description in the specific embodiments should be understood as an explanation of the spirit of this utility model and should not be regarded as an improper limitation of this utility model.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the specific technical solutions of this utility model will be further described in detail below with reference to the accompanying drawings of the embodiments of this utility model. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] In the embodiments of this utility model, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Furthermore, in this embodiment of the invention, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0023] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0024] In embodiments of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0025] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant information in a specific manner.

[0026] Example 1: like Figure 1 As shown, this embodiment proposes a battery cover connection structure, which in some implementations includes: The battery cell connection plate 1 includes a first electrode tab welding area, on which a nickel sheet 11 is disposed. The nickel sheet 11 has a first portion 111 and a second portion 112, and the first portion 111 is welded to the first electrode tab welding area. The battery protection board 2 is composed of a welding plate 22, a combination plate 23, and a base plate 24 from top to bottom. The welding plate 22 is provided with a second tab welding area 21, which is connected by spot welding through a second part 112.

[0027] Specifically, a first tab welding area is provided on the cell connection plate 1, and a nickel sheet 11 is provided on the first tab welding area. The nickel sheet 11 has a first part 111 for connecting to the first tab welding area, and a second part 112 for welding to the second tab welding area 21. When welding the nickel sheet 11 to the first tab welding area and the second tab welding area 21, they are usually welded to the same side of the nickel sheet 11 to avoid bending of the nickel sheet 11, which would reduce the reliability of the nickel sheet 11. At the same time, compared with the prior art, which has one nickel sheet 11 in the first tab welding area and another nickel sheet 11 in the second tab welding area 21, and is connected by the two nickel sheets 11, the nickel sheet 11 in this embodiment will not bend, and is connected by only one nickel sheet 11, thereby achieving a higher overcurrent capacity of a single nickel sheet 11 when a large current passes through. Furthermore, reducing the number of nickel sheets 11 can reduce the use of nickel sheets 11, which can achieve cost savings in mass cell production. Meanwhile, the welding area 21 of the second electrode is connected by spot welding only, which can improve the welding efficiency.

[0028] The assembly board 23 typically includes a welding board 22, the assembly board 23, and a base plate 24. The welding board 22 is used to set the first tab welding area, which can be achieved by slotting or by setting a copper layer for connecting the nickel sheet 11 within the first tab welding area. The assembly board 23 is a circuit board, including a core board, a PP layer, and a metal layer. The circuitry within the assembly board 23 enables the function of the battery protection board 2, and the operating data inside the battery cell is obtained through the first tab welding area and the second tab welding area 21.

[0029] The cell connection plate 1 has a first tab welding area, on which a nickel sheet 11 is provided. The nickel sheet 11 has a first part 111 and a second part 112. The first part 111 is welded to the first tab welding area. The battery protection plate 2 is composed of a welding plate 22, a combination plate 23, and a base plate 24, arranged from top to bottom. The welding plate 22 has a second tab welding area 21, which is welded to the second part 112. This reduces the use of nickel sheets 11, thereby improving production efficiency and reducing production processes by connecting only one nickel sheet 11. Furthermore, the reliability of the cell to the battery protection plate 2 is improved by connecting with a single nickel sheet 11.

[0030] Example 2: like Figures 2-3 As shown, this embodiment is an optimization and explanation based on embodiment 1: In some embodiments, the composite board 23 includes, from top to bottom, a first metal layer 231, a composite core board layer 232, and a second metal layer 233. Specifically, the first metal layer 231 and the second metal layer 233 in the composite board 23 are typically copper layers for electrical connection with devices such as those in the solder layer.

[0031] In some embodiments, a third metal layer 211 is provided in the second electrode welding area 21, and the third metal layer 211 is connected to the first metal layer 231.

[0032] Specifically, during manufacturing, a through groove can be cut out in the second tab welding area 21 of the welding plate 22, and a third metal layer 211, preferably a copper layer, can be provided so that the nickel sheet 11 is connected to the third metal layer 211 rather than connected deep into the second tab welding area 21, so as to avoid structural instability of the connection between the nickel sheet 11 and the battery protection plate 2.

[0033] In some embodiments, a first thick copper layer 234 is provided on the side of the first metal layer 231 of the composite plate 23 corresponding to the second tab welding area 21 near the composite core plate layer 232, and / or a second thick copper layer 235 is provided on the side of the second metal layer 233 of the composite plate 23 corresponding to the second tab welding area 21 near the composite core plate layer 232. Specifically, the first thick copper layer 234 is used to increase the current carrying capacity when the use of nickel sheets 11 is reduced and the second tab welding area 21 and the second part 112 are only spot welded, so as to maintain the normal operation of the battery cell. Thus, while reducing the use of nickel sheets 11 to improve production efficiency, reduce processes, and increase stability and reliability, it also has the same current carrying capacity as before. Simultaneously, a second thick copper layer 235 can be provided. The function of the second thick copper layer 235 can be the same as that of the first thick copper layer 234, which is to improve the current carrying capacity. Preferably, the first thick copper layer 234 and the second thick copper layer are provided at the same time to ensure the maximum carrying capacity. Reducing the setting of the second thick copper layer 235 can reduce the process and the use of copper layers. The first thick copper layer 234 is necessary because it directly contacts the second electrode tab welding area 21, and the improvement effect is the best.

[0034] In some embodiments, the combined thickness of the first thick copper layer 234 and the first metal layer 231 is at least greater than 180 μm. Specifically, the thick copper layer needs to ensure that the copper layer thickness below the second tab solder area 21 is greater than 180 μm to guarantee the carrying capacity of high current.

[0035] In some embodiments, the combined thickness of the second thick copper layer 235 and the second metal layer 233 is at least greater than 180 μm. Specifically, the configuration of the second thick copper layer 235 can be consistent with that of the first thick copper layer 234. However, in order to save on the use of thick copper and simplify the process, when both the first thick copper layer 234 and the second thick copper layer 235 are present, the thickness of the second thick copper layer 235 can be reduced. That is, when additionally electroplating the thick copper area, the first thick copper area can be electroplated twice.

[0036] In some embodiments, the thickness of the first metal layer 231 and the second metal layer 233 is 155um. Specifically, 155um is typically used. In some more specific embodiments, a single electroplating can increase the thickness by about 35um. In order to meet the 180um thickness requirement, at this thickness, only one electroplating is needed to meet the thick copper requirement, thereby avoiding the excessive and cumbersome process caused by multiple electroplatings.

[0037] In some embodiments, the cell connection board 1 includes a first device welding area, and the battery protection board 2 includes a second device welding area. The first and second device welding areas are aligned and the device is disposed between the first and second device welding areas. Specifically, it also includes a device welding area for welding other devices, such as sensors, which are disposed between the battery protection board 2 and the battery connection board. The second device welding area is typically provided with a slot, and no metal layer needs to be provided inside, thereby reducing the use of metal layers and streamlining the process. The device can be directly welded into the first metal layer 231, thereby achieving the welding effect between the device and the battery protection board 2.

[0038] In some embodiments, the area of ​​the second tab welding area 21 is larger than the area of ​​the second portion 112. Specifically, the area of ​​the second tab welding area 21 is typically larger than the area of ​​the second portion 112, so that the second portion 112 of the nickel sheet 11 can be completely welded to the second tab welding area 21, thereby improving the tolerance of production. Furthermore, in some more specific embodiments, the second tab welding area 21 is partially connected to the second portion 112 of the nickel sheet 11 to avoid the overall connection causing the mechanical structure to prevent complete bonding when the battery protection board 2 and the cell are joined.

[0039] Example 3: This embodiment proposes a battery cell, including a battery cover connection structure as described in either Embodiment 1 or Embodiment 2, wherein the battery cover connection structure is disposed on the top of the battery cell body.

[0040] Example 4: like Figure 4 As shown, this embodiment further describes the battery protection board 2 proposed in Embodiments 1 and 2, to further illustrate the molding process of the battery protection board 2 structure, so as to form the battery protection board 2 structure as in Embodiments 1 and 2, including the following steps: S1, Lamination: In accordance with normal PCB production methods, lamination is carried out up to L1-6, with the outer layer using 5oz (155um) copper foil for lamination.

[0041] S2, Inner layer pattern: The outermost 5oz nickel sheet with 11mm thick copper area is made by using the process of applying dry film-exposure-development-etching-film removal-inspection.

[0042] S3. Resin Printing: The process of printing-baking-grinding-inspection is adopted. Resin ink is printed on the non-copper areas to fill them using screen printing.

[0043] S4. Drilling: Drilling is performed on the product using a drilling-inspection process.

[0044] S5. Electroplating: The process of immersion copper-electroplating is adopted to perform thick copper electroplating on the circuit layer of the product to meet the customer's requirement of thick copper ≥180um in the 11th zone of nickel sheet.

[0045] S6. Outer layer circuit: The final outer layer circuit is produced by using a process of applying dry film, exposure, development, etching, film removal, and inspection.

[0046] S7. Anti-welding and subsequent processes: The process of anti-welding, text, molding, testing, finished product inspection, surface treatment and packaging is adopted. After the subsequent processes are completed normally, the product is shipped.

[0047] The serial numbers of the utility model embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are only preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A battery cover connection structure, characterized in that, include: The cell connection plate (1) is provided with a first electrode tab welding area, and a nickel sheet (11) is provided on the first electrode tab welding area. The nickel sheet (11) is provided with a first part (111) and a second part (112). The first part (111) is welded to the first electrode tab welding area. as well as The battery protection board (2) is composed of a welding plate (22), a combination plate (23), and a base plate (24) from top to bottom. The welding plate (22) is provided with a second tab welding area (21), which is connected by spot welding through the second part (112).

2. The battery cover connection structure according to claim 1, characterized in that, The composite plate (23) includes, from top to bottom, a first metal layer (231), a composite core plate layer (232), and a second metal layer (233).

3. The battery cover connection structure according to claim 2, characterized in that, A third metal layer (211) is provided in the second electrode welding area (21), and the third metal layer (211) is connected to the first metal layer (231).

4. The battery cover connection structure according to claim 2, characterized in that, A first thick copper layer (234) is provided on the side of the first metal layer (231) of the combined plate (23) corresponding to the second electrode welding area (21) near the combined core plate layer (232), and / or a second thick copper layer (235) is provided on the side of the second metal layer (233) of the combined plate (23) corresponding to the second electrode welding area (21) near the combined core plate layer (232).

5. The battery cover connection structure according to claim 4, characterized in that, The combined thickness of the first thick copper layer (234) and the first metal layer (231) is at least greater than 180 μm.

6. The battery cover connection structure according to claim 4, characterized in that, The combined thickness of the second thick copper layer (235) and the second metal layer (233) is at least greater than 180 μm.

7. The battery cover connection structure according to claim 3, characterized in that, The thickness of the first metal layer (231) and the second metal layer (233) is 155 μm.

8. The battery cover connection structure according to claim 1, characterized in that, The cell connection board (1) includes a first device welding area, and the battery protection board (2) includes a second device welding area. The first device welding area and the second device welding area are aligned and the device is disposed between the first device welding area and the second device welding area.

9. The battery cover connection structure according to claim 1, characterized in that, The area of ​​the second electrode welding area (21) is larger than the area of ​​the second part (112).

10. A battery cell, characterized in that, Includes the battery cover connection structure as described in any one of claims 1-9, wherein the battery cover connection structure is disposed on the top of the cell body.

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