Adapter piece, battery top cover and power battery

Abstract

The utility model provides a kind of adapter plate, battery top cover and power battery, adapter plate includes connecting plate and welding sheet.The connecting plate is used to connect with the tab of battery cell;Welding sheet is used to be welded with pole, and it is located in the side of connecting plate along the direction perpendicular to the board surface of connecting plate, the thickness of welding sheet is less than the thickness of connecting plate, part of welding sheet extends towards connecting plate, and is connected with connecting plate.The adapter plate of the utility model, on the one hand, welding sheet is located in the side of connecting plate perpendicular to the board surface of connecting plate, can increase the distance of welding sheet and the board surface of connecting plate, the thickness of welding sheet is less than the thickness of connecting plate, can reduce the welding power required when welding sheet and tab weld, so as to reduce the risk of power battery insulation failure.On the other hand, the thickness of welding sheet is smaller, can reduce the overall resistance of adapter plate.

Description

Technical Field

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

[0002] In a power battery, the battery cell is placed inside a casing, and a cover plate, together with the casing, encapsulates the cell. The cell's tabs connect to adapter plates, which are welded to terminals mounted on the cover plate and exposed outside the casing, allowing the cell to supply power to an external circuit through the terminals. The adapter plates and terminals are located on opposite sides of the cover plate, which is conductive and has insulating components to isolate the adapter plates and terminals. In existing technology, molten metal generated during the welding of the adapter plates and terminals can splash or flow, bypassing the insulating components and moving onto the cover plate, causing a direct connection between the adapter plates, terminals, and cover plate, which can lead to insulation failure in the power battery. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an adapter plate, a battery top cover, and a power battery, which can reduce the risk of power battery insulation failure.

[0004] In a first aspect, this utility model provides an adapter plate, which includes a connecting plate and a welding piece. The connecting plate is used to connect to the tabs of the battery cell; the welding piece is used to weld to the terminal post and is located on one side of the connecting plate in a direction perpendicular to the surface of the connecting plate. The thickness of the welding piece is less than the thickness of the connecting plate, and a portion of the welding piece extends toward the connecting plate and connects with the connecting plate.

[0005] The adapter provided in the first aspect of this utility model has at least the following beneficial effects: On one hand, the welding piece is used for welding to the electrode tab. Located on the side of the connecting plate perpendicular to its surface, the welding piece increases the distance between it and the connecting plate, reducing the risk of molten metal splashing or flowing onto the connecting plate during welding and into the gap between the adapter plate and the cover plate. The welding piece's thickness is less than the connecting plate's thickness, reducing the welding power required for welding the electrode tab and thus lowering the risk of molten metal splashing when welding the welding piece to the terminal post, thereby reducing the risk of battery insulation failure. On the other hand, the smaller thickness of the welding piece reduces the overall internal resistance of the adapter plate.

[0006] In one embodiment of this implementation, the welding sheet is formed by stamping.

[0007] In one embodiment of this implementation, one side of the welding sheet is an embossed surface, and multiple embossed grooves are provided on the embossed surface at intervals.

[0008] In one embodiment of this implementation, a welding hole is provided on the welding sheet, and the axis of the welding hole is perpendicular to the surface of the welding sheet.

[0009] In one embodiment of this implementation, the thickness of the connecting plate is 0.96mm-1.80mm, and the thickness of the welding sheet is 0.64mm-1.20mm.

[0010] Secondly, the present invention provides a battery top cover, which includes a terminal post, a cover plate, and an adapter piece according to any embodiment of the first aspect of the invention. Two terminals and two adapter pieces are provided. The adapter piece cooperates with the cover plate, and the two terminals are connected to the two welding pieces in a one-to-one correspondence.

[0011] The battery top cover provided by the second aspect of this utility model has at least the following beneficial effects: By incorporating the adapter piece from the first aspect of this invention into the battery top cover, the risk of insulation failure of the power battery can be reduced when the battery top cover is installed on the power battery.

[0012] In one embodiment of this implementation, one adapter piece is made of copper and the other adapter piece is made of aluminum.

[0013] In one embodiment of this implementation, the thickness of the connecting plate made of copper is 0.96mm-1.44mm, and the thickness of the welding sheet made of copper is 0.64mm-0.96mm.

[0014] In one embodiment of this implementation, the thickness of the connecting plate made of aluminum is 1.2mm-1.8mm, and the thickness of the welding sheet made of aluminum is 0.8mm-1.2mm.

[0015] Thirdly, the present invention provides a power battery, which includes a battery cell, a housing, and a battery top cover according to any one of the embodiments of the second aspect. The battery cell is disposed in the housing, the battery top cover is disposed on the housing, and the adapter plate is connected to the electrode tab of the battery cell.

[0016] The power battery provided by the third aspect of this utility model has at least the following beneficial effects: By incorporating the battery top cover as described in the second aspect of this invention into the power battery, the risk of power battery insulation failure can be reduced.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a three-dimensional structural diagram of the adapter piece according to one embodiment of the present invention; Figure 2 yes Figure 1 An enlarged schematic diagram of part of the structure of the adapter plate; Figure 3 yes Figure 1 A top view of the adapter plate; Figure 4 yes Figure 3 A cross-sectional view of the adapter piece along the AA direction; Figure 5 This is a top view of the battery top cover according to one embodiment of the present utility model; Figure 6 yes Figure 5 A cross-sectional view of the battery top cover along the BB direction; Figure 7 yes Figure 6 An enlarged schematic diagram of part of the battery top cover structure.

[0019] Figure label: Adapter plate 100; connecting plate 10; first plate surface 11; second plate surface 12; welding plate 20; embossed surface 21; embossed groove 22; welding hole 23; welding part 24; extension part 25; battery top cover 200; terminal post 210; cover plate 220; insulating part 230; assembly gap 240. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0026] Please see Figures 1 to 4 , Figure 1 This is a three-dimensional structural schematic diagram of the adapter piece 100 according to one embodiment of the present utility model; Figure 2 yes Figure 1 An enlarged schematic diagram of part of the structure of the adapter piece 100; Figure 3 yes Figure 1 Top view of adapter plate 100; Figure 4 yes Figure 3 A cross-sectional view of the adapter piece 100 along the AA direction. This embodiment of the invention provides an adapter piece 100, which includes a connecting plate 10 and a welding piece 20. The connecting plate 10 is used to connect to the tabs of a battery cell; the welding piece 20 is used to weld to a terminal post 210 and is located on one side of the connecting plate 10 along a direction perpendicular to the plate surface of the connecting plate 10. The thickness of the welding piece 20 is less than the thickness of the connecting plate 10, and a portion of the welding piece 20 extends toward and connects to the connecting plate 10.

[0027] Specifically, the connecting plate 10 has two surfaces, namely a first surface 11 and a second surface 12. The first surface 11 and the second surface 12 are arranged at intervals along the Z direction, and both the first surface 11 and the second surface 12 are perpendicular to the Z direction. The welding piece 20 is located on the side of the first surface 11 along the Z direction and away from the second surface 12. The welding piece 20 includes a welding portion 24 and an extension portion 25. The welding portion 24, the extension portion 25, and the first surface 11 are arranged sequentially along the Z direction. One end of the extension portion 25 along the Z direction is connected to the welding portion 24, and the other end of the extension portion 25 along the Z direction extends to the first surface 11 to connect with the connecting plate 10. The thickness b of the welding portion 24 is less than the thickness a of the connecting plate 10. It should be understood that the thickness of the extension portion 25 may also be less than the thickness a of the connecting plate 10.

[0028] It should be noted that please refer to the following as well. Figures 5 to 7 , Figure 5 This is a top view of the battery top cover 200 according to one embodiment of the present utility model; Figure 6 yes Figure 5 A sectional view of the battery top cover 200 along the BB direction; Figure 7 yes Figure 6 This is an enlarged schematic diagram of a portion of the structure of the battery top cover 200. In a power battery, the adapter plate 100 and the terminal post 210 are typically located on opposite sides of a cover plate 220. The cover plate 220 is made of metal and has an insulating element 230 positioned within the assembly gap 240 between the adapter plate 100 and the terminal post 210. The adapter plate 100 and the terminal post 210 are mounted on the insulating element 230 to reduce the risk of a short circuit caused by direct contact between the adapter plate 100 or the insulating element 230 and the cover plate 220. During the welding of the welding piece 20 to the terminal post 210, molten metal may flow in the assembly gap 240. This flowing molten metal may bypass the insulating element 230 or melt the insulating element 230 within the assembly gap 240, flowing to the cover plate 220 and causing the insulating effect of the insulating element 230 to fail. When welding the welding piece 20 to the pole post 210, molten metal may splash onto the side of the welding piece 20 facing the first plate surface 11. The splashed molten metal may splash onto the second plate surface 12 and flow from the edge of the second plate surface 12 onto the cover plate 220, thereby causing the insulation effect of the insulating component 230 to fail.

[0029] Understandably, the welding piece 20 is located on the side of the first plate surface 11 along the Z direction and away from the second plate surface 12. This increases the distance between the welding part 24 and the first plate surface 11, and also increases the distance between the welding part 24 and the second plate surface 12, thereby reducing the risk of molten metal splashing onto the second plate surface 12. The welding part 24 is used for welding with the electrode post 210, and the extension part 25 is used to allow the current on the connecting plate 10 to be transmitted to the welding part 24 via the extension part 25. Laser welding is typically used to weld the welding part 24 to the electrode post 210. The thickness b of the welding part 24 is smaller than the thickness a of the connecting plate 10, which reduces the laser power required when welding the welding part 24 to the electrode post 210. This reduces the risk of molten metal flowing in the assembly gap 240 and also reduces the risk of molten metal splashing onto the welding part 24.

[0030] The adapter piece 100 of this invention has two main advantages. First, the welding piece 20 is used for welding to the electrode tab. The welding piece 20 is located on the side of the connecting plate 10 perpendicular to its surface, which increases the distance between the welding piece 20 and the surface of the connecting plate 10. This reduces the risk of molten metal splashing or flowing to the connecting plate 10 and into the gap between the adapter piece 100 and the cover plate 220 during welding. The thickness of the welding piece 20 is less than the thickness of the connecting plate 10, which reduces the welding power required when welding the welding piece 20 to the electrode tab. This reduces the risk of molten metal splashing when welding the welding piece 20 to the terminal post 210, thereby reducing the risk of battery insulation failure. Second, the small thickness of the welding piece 20 reduces the overall internal resistance of the adapter piece 100.

[0031] Please see Figure 1 In one embodiment of this implementation, the welding sheet 20 is formed by stamping.

[0032] Specifically, a portion of a metal sheet is stamped to create a recessed groove along a direction perpendicular to the sheet surface. While the recess is formed on one portion of the metal sheet, the remaining portion forms the connecting plate 10. The bottom wall of the groove forms a welded portion 24, and the side walls of the groove form extensions 25.

[0033] It is understandable that forming the welding piece 20 by stamping simplifies the production process of the adapter piece 100 and improves its production efficiency. During the stamping process of the metal sheet, the thickness of the stamped portion of the metal sheet is reduced, making the thickness of the welded piece 20 formed by stamping smaller than the thickness of the connecting plate 10.

[0034] Please see Figures 1 to 3 In one embodiment of this implementation, one side of the welding sheet 20 is an embossed surface 21, and a plurality of embossed grooves 22 are provided on the embossed surface 21.

[0035] Specifically, the welding piece 20 has two spaced-apart surfaces, both perpendicular to the Z-direction. The surface closer to the second plate surface 12 is the embossed surface 21. It is understood that, on the one hand, when current passes through the adapter piece 100, heat is generated on the adapter piece 100. The embossed surface 21 increases the surface area of ​​the adapter piece 100, thereby improving its heat dissipation capacity. On the other hand, during the welding of the adapter piece 100 to the electrode post 210, molten metal can flow on the embossed surface 21 and fill the embossed groove 22. The embossed surface 21 improves the welding quality, thereby enhancing the stability of the weld between the electrode post 210 and the adapter piece 100.

[0036] Please see Figures 1 to 4 In one embodiment of this implementation, a welding hole 23 is provided on the welding sheet 20, and the axis of the welding hole 23 is perpendicular to the surface of the welding sheet 20.

[0037] Specifically, the axis of weld hole 23 is parallel to the Z direction. Please refer to the following for further information. Figure 7 The welding hole 23 exposes the electrode post 210 located on one side of the adapter piece 100 along the Z direction to the other side of the adapter piece 100 along the Z direction, facilitating welding between the adapter piece 100 and the electrode post 210. It should be understood that in some embodiments, the welding hole 23 can be used for protrusions on the electrode post 210 to pass through, allowing molten metal generated during welding to flow into the embossing groove 22, thereby improving welding quality.

[0038] Please see Figures 1 to 4 In one embodiment of this implementation, the thickness of the connecting plate 10 is 0.96mm-1.80mm, and the thickness of the welding piece 20 is 0.64mm-1.20mm.

[0039] Specifically, the thickness a of the connecting plate 10 can be 0.96mm, 1.20mm, 1.38mm, 1.50mm or 1.80mm, and the thickness b of the welding piece 20 can be 0.64mm, 0.80mm, 0.92mm, 1.00mm or 1.20mm.

[0040] Understandably, when the thickness 'a' of the connecting plate 10 is less than 0.96 mm, the connecting plate 10 will have lower strength and be easily damaged; when the thickness 'a' of the connecting plate 10 is greater than 1.80 mm, the internal resistance of the adapter piece 100 will be too high. When the thickness 'b' of the welding piece 20 is less than 0.64 mm, the welding piece 20 will be easily burned through during the welding process; when the thickness of the welding piece 20 is greater than 1.20 mm, the welding piece 20 will easily generate molten metal spatter during the welding process, and will also increase the internal resistance of the adapter piece 100. Setting the thickness 'a' of the connecting plate 10 to 0.96 mm-1.80 mm helps to reduce the internal resistance of the adapter piece 100 while ensuring the strength of the adapter piece 100. Setting the thickness 'b' of the welding piece 20 to 0.64 mm-1.20 mm helps to reduce the risk of the welding piece 20 being burned through while also reducing the internal resistance of the adapter piece 100.

[0041] Please see Figures 5 to 7 This utility model provides a battery top cover 200, which includes a terminal post 210, a cover plate 220, and an adapter piece 100 according to any embodiment of the first aspect of the embodiment. Two terminals 210 and two adapter pieces 100 are provided. The adapter piece 100 cooperates with the cover plate 220, and the two terminals 210 are connected to two welding pieces 20 in a one-to-one correspondence.

[0042] Specifically, one of the two adapter pieces 100 is used to connect to the positive electrode tab of the battery cell, and the other is used to connect to the negative electrode tab of the battery cell. The terminal post 210 and the adapter piece 100 are respectively located on one side of the cover plate 220. The cover plate 220 has a through-hole, which exposes the terminal post 210 on the side of the cover plate 220 facing the adapter piece 100. A portion of the terminal post 210 passes through the through-hole, and the adapter piece 100 is welded to the portion of the terminal post 210 that passes through the through-hole. The battery top cover 200 also includes an insulating member 230. A fitting gap is formed between the adapter piece 100 and the terminal post 210, and the insulating member 230 is located within the fitting gap. By adding the adapter piece 100 of the first aspect embodiment of this utility model to the battery top cover 200, the risk of insulation failure of the power battery can be reduced when the battery top cover 200 is installed on the power battery.

[0043] Please see Figures 5 to 7 In one embodiment of this implementation, one adapter piece 100 is made of copper and the other adapter piece 100 is made of aluminum.

[0044] Specifically, the adapter 100 for connecting to the positive electrode tab of the battery cell is made of aluminum, and the adapter 100 for connecting to the negative electrode tab of the battery cell is made of copper.

[0045] Understandably, the copper adapter 100 is prone to oxidation when connected to the positive electrode tab, which increases its internal resistance. Conversely, the aluminum adapter 100, when connected to the negative electrode tab, will form a lithium-intercalated alloy, affecting its lifespan and performance. Connecting the aluminum adapter 100 to the positive electrode tab and the copper adapter 100 to the negative electrode tab helps reduce the risk of oxidation for the copper adapter 100 and also reduces the risk of lithium-intercalated alloy formation for the aluminum adapter 100.

[0046] Please see Figure 4 and Figure 6 In one embodiment of this implementation, the thickness of the connecting plate 10 made of copper is 0.96mm-1.44mm, and the thickness of the welding sheet 20 made of copper is 0.64mm-0.96mm.

[0047] Specifically, the thickness a of the connecting plate 10 made of copper can be 0.96mm, 1.15mm, 1.20mm, 1.25mm or 1.44mm, and the thickness b of the welding piece 20 made of copper can be 0.64mm, 0.75mm, 0.80mm, 0.85mm or 0.96mm.

[0048] Understandably, when the thickness 'a' of the copper connecting plate 10 is less than 0.96 mm, its strength is low, making it easily damaged. When the thickness 'a' is greater than 1.44 mm, the internal resistance of the copper adapter piece 100 is too high. Similarly, when the thickness 'b' of the copper welding piece 20 is less than 0.64 mm, it is prone to burn-through during welding. When the thickness 'b' is greater than 0.96 mm, it is prone to molten metal spatter during welding and also increases the internal resistance of the copper adapter piece 100. A thickness 'a' of 0.96 mm to 1.44 mm for the copper connecting plate 10 helps to reduce its internal resistance while maintaining its strength. Similarly, a thickness 'b' of 0.64 mm to 0.96 mm helps to reduce the risk of burn-through while also reducing the internal resistance of the copper adapter piece 100.

[0049] Please see Figure 4 and Figure 6 In one embodiment of this implementation, the thickness of the connecting plate 10 made of aluminum is 1.2mm-1.8mm, and the thickness of the welding sheet 20 made of aluminum is 0.8mm-1.2mm.

[0050] Specifically, the thickness a of the connecting plate 10 made of aluminum can be 1.2mm, 1.4mm, 1.5mm, 1.6mm or 1.8mm, and the thickness b of the welding sheet 20 made of aluminum can be 0.8mm, 0.9mm, 1.0mm, 1.1mm or 1.2mm.

[0051] Understandably, when the thickness 'a' of the aluminum connecting plate 10 is less than 1.2 mm, its strength is low, making it easily damaged. When the thickness 'a' is greater than 1.8 mm, the internal resistance of the aluminum adapter piece 100 is too high. Similarly, when the thickness 'b' of the aluminum welding piece 20 is less than 0.8 mm, it is easily welded through during welding. When the thickness 'b' is greater than 1.2 mm, it is prone to molten metal spatter during welding and also increases the internal resistance of the aluminum adapter piece 100. Setting the thickness 'a' of the aluminum connecting plate 10 to 1.2 mm-1.8 mm helps to reduce the internal resistance of the adapter piece 100 while maintaining its strength. Similarly, setting the thickness 'b' of the welding piece 20 to 0.8 mm-1.2 mm helps to reduce the risk of the welding piece 20 being welded through while also reducing its internal resistance.

[0052] This utility model provides a power battery, which includes a battery cell, a housing, and a battery top cover 200 according to any one of the second aspects of the embodiment. The battery cell is disposed in the housing, the battery top cover 200 is disposed on the housing, and the adapter piece 100 is connected to the electrode tab of the battery cell.

[0053] Specifically, the housing has a chamber, and the battery cells are placed inside the chamber. The chamber has an opening, and the battery top cover 200 covers the opening and, together with the housing, encloses the battery cells. The battery top cover 200 can be connected to the housing by welding, gluing, magnetic attraction, or bolting. By adding the battery top cover 200 of the second aspect of this utility model to the power battery, the risk of insulation failure of the power battery can be reduced.

[0054] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A tab, characterized in that include: Connecting plate, used to connect to the electrode tabs of the battery cell; A welding tab, used for welding to the pole post, is located on one side of the connecting plate in a direction perpendicular to the plate surface of the connecting plate. The thickness of the welding tab is less than the thickness of the connecting plate. A portion of the welding tab extends toward the connecting plate and is connected to the connecting plate.

2. The adapter plate of claim 1, wherein, The welded sheet is formed by stamping.

3. The adapter plate of claim 1, wherein, One side of the welding sheet is an embossed surface, and multiple embossed grooves are arranged at intervals on the embossed surface.

4. The adapter plate of claim 1, wherein, The welding sheet has a welding hole that penetrates through it, and the axis of the welding hole is perpendicular to the surface of the welding sheet.

5. The adapter plate of claim 1, wherein, The thickness of the connecting plate is 0.96mm-1.80mm, and the thickness of the welding piece is 0.64mm-1.20mm.

6. A battery top cover characterized by, It includes a pole, a cover plate, and an adapter plate according to any one of claims 1 to 5, wherein two poles and two adapter plates are provided, the adapter plate cooperates with the cover plate, and the two poles are connected to the two welding plates in a one-to-one correspondence.

7. The battery header of claim 6, wherein, One of the adapter pieces is made of copper, and the other adapter piece is made of aluminum.

8. The battery top cover according to claim 7, characterized in that, The connecting plate made of copper has a thickness of 0.96mm-1.44mm, and the welding piece made of copper has a thickness of 0.64mm-0.96mm.

9. The battery cover of claim 7, wherein, The connecting plate, made of aluminum, has a thickness of 1.2mm-1.8mm, and the welding sheet, also made of aluminum, has a thickness of 0.8mm-1.2mm.

10. A power cell, characterized by The battery includes a battery cell, a housing, and a battery top cover according to any one of claims 6 to 9, wherein the battery cell is disposed in the housing, the battery top cover is disposed on the housing, and the adapter plate is connected to the electrode tab of the battery cell.

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