Protective battery top cover

Abstract

The utility model discloses a protective battery top cover, the cover plate is provided with mounting hole, the pole column subassembly is installed in the mounting hole at least partially, the welding surface is formed to the side of the battery in the pole column subassembly to the electric core, the protective piece sealed fixed on the region of the pole column subassembly with welding surface, set up with the welding surface of covering the welding surface, there is the interval between the protective piece and the welding surface, or the protective piece and the welding surface mutual contact. It makes the battery use more safely.

Description

Technical Field

[0001] This utility model belongs to the technical field of components for new energy vehicle batteries, specifically relating to a protective battery top cover. Background Technology

[0002] New energy vehicle batteries consist of cells, a casing, and a top cover. The cells are located inside the casing, and the top cover seals the casing to encapsulate the cells. The top cover consists of a top cover plate and terminals mounted on the top cover plate. For the negative electrode, copper-aluminum terminals are generally used. These copper-aluminum terminals are formed by fixing copper and aluminum terminals together through laser welding or ultrasonic welding. However, after laser penetration welding or ultrasonic penetration welding of copper and aluminum, an aluminum inversion phenomenon was found. Furthermore, during welding, the welded area is exposed because the weld is penetrated through one side of the copper terminal. Therefore, the exposed welded area can easily come into contact with the electrolyte. Under low voltage (negative electrode), aluminum reacts with Li ions in the electrolyte to form a Li-Al alloy. Over time, this alloy may detach, causing a short circuit and explosion risk. Therefore, improvements are urgently needed. Utility Model Content

[0003] The purpose of this utility model is to provide a protective battery top cover to overcome the shortcomings of the existing technology.

[0004] To achieve the above objectives, the present invention provides a protective battery top cover, comprising: Cover plate, wherein the cover plate is provided with mounting holes; A terminal assembly, which is at least partially mounted in the mounting hole, and a welding surface is formed on the side of the terminal assembly facing the cell inside the battery. A protective component is sealed and fixed to the area with a welding surface on the pole assembly to cover the welding surface. There is a gap between the protective component and the welding surface, or the protective component is in contact with the welding surface. According to the protective battery top cover described above, the terminal assembly includes a first terminal and a second terminal. The first connecting part of the first terminal and the second connecting part of the second terminal are welded and fixed to each other, so that a welding surface is formed on the side of the second connecting part of the second terminal facing the cell inside the battery.

[0005] According to the protective battery top cover described above, the second pole includes a convex bulge, which forms a second connecting portion and a cavity located below the second connecting portion. After the second connecting portion is welded and fixed to the first connecting portion of the first pole, a welding mark is formed on the side of the second connecting portion facing the cavity, so that the side with the welding mark serves as the welding surface.

[0006] According to the protective battery top cover described above, the cover plate has two mounting holes, and each mounting hole contains a terminal assembly. The first terminal of the terminal assembly in one mounting hole is made of aluminum and the second terminal is made of copper. The first terminal and the second terminal of the terminal assembly in the other mounting hole are both made of aluminum. The protective component is located at the cavity opening of the copper second terminal, and the outer edge of the protective component is welded and fixed to the edge of the cavity opening of the copper second terminal to seal the cavity.

[0007] According to the protective battery top cover described above, the cavity opening edge of the copper second pole has a continuous annular fixing recess, the outer edge of the protective component is positioned in the annular fixing recess, and the inner wall of the annular fixing recess is welded and fixed to the outer edge of the protective component. The protective component is a copper sheet.

[0008] According to the protective battery top cover described above, the second pole post also includes an annular protrusion continuously disposed on the outer periphery of the protrusion, and a sealing ring is sleeved on the protrusion, the sealing ring being clamped between the annular protrusion and the back of the cover plate.

[0009] According to the protective battery top cover described above, the terminal assembly also includes an upper insulating member, which is clamped and disposed between the area with mounting holes on the front side of the cover plate and the first terminal.

[0010] According to the protective battery top cover described above, the area with mounting holes on the front of the cover plate is provided with an annular positioning part surrounding the outer peripheral wall of the upper insulating member. The outer edge of the upper insulating member forms a continuous and protruding annular limiting part. The outer peripheral wall of the first electrode post abuts against the inner wall of the annular limiting part. The outer wall of the annular limiting part and the outer peripheral wall of the first upper insulating member are both abutting against the inner wall of the annular positioning part. Furthermore, the annular limiting part, the annular positioning part, and the first upper insulating member are all polygonal structures.

[0011] According to the protective battery top cover described above, a lower insulating member is fixed on the back of the cover plate. The lower insulating member is provided with a through hole corresponding to the mounting hole so that the sealing ring is located in the through hole. The part of the lower insulating member located on the inner wall of the through hole is clamped by the annular protrusion and the cover plate, and a connecting piece is connected to the annular protrusion.

[0012] According to the above-described protective battery top cover, the outer periphery of the annular protrusion is provided with a fixed step and a fixed boss, the connecting piece is provided with a fixed hole, the fixed boss is positioned in the fixed hole and welded to each other, and the fixed step limits the connecting piece.

[0013] This utility model provides a protective battery top cover, which has the following beneficial effects: The battery top cover of this invention prevents the exposed copper-aluminum weld joint from coming into contact with the electrolyte, thereby avoiding the risk of aluminum reacting with Li ions in the electrolyte to form a LI-AL alloy under low voltage (negative electrode) conditions, which could lead to short circuits and explosions over time. This makes the battery safer to use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery top cover (I).

[0015] Figure 2 This is a schematic diagram of the negative electrode post assembly structure.

[0016] Figure 3 This is a schematic diagram of the positive electrode post assembly structure.

[0017] Figure 4 This is an exploded view of the battery top cover (I).

[0018] Figure 5 This is an exploded view of the battery top cover (II).

[0019] Figure 6 This is a schematic diagram of the battery top cover (II).

[0020] Among them, 1. cover plate; 11. mounting hole; 12. positioning recess; 13. annular positioning protrusion; 2. Pole post assembly; 21. First pole post; 22. Second pole post; 23. Sealing ring; 24. Upper insulating component; 211. First connecting part; 221. Second connecting part; 222. Welding surface; 223. Protrusion; 224. Cavity; 225. Annular protrusion; 226. Annular fixing recess; 227. Fixing boss; 228. Fixing step; 241. Annular limiting part; 242. Inner hole; 243. Positioning ring; 3. Protective components; 4. Connecting piece; 41. Fixing hole; 5. Lower insulating component; 51. Through hole. Detailed Implementation

[0021] To enable those skilled in the art to better understand this utility model and to more clearly define the scope of protection claimed by this utility model, the present utility model is described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present utility model, and the specific and direct descriptions of related structures are merely for the convenience of understanding the present utility model; the specific features do not necessarily or directly limit the scope of implementation of the present utility model. Conventional choices and substitutions made by those skilled in the art under the guidance of the present utility model should all be considered within the scope of protection claimed by this utility model.

[0022] Example: like Figures 1-4 As shown in this embodiment, a protective battery top cover includes a cover plate 1, a terminal post assembly 2, and a protective member 3. The cover plate 1 is provided with a mounting hole 11, and the terminal post assembly 2 is at least partially installed in the mounting hole 11. A welding surface 222 is formed on the side of the terminal post assembly 2 facing the battery cell. The protective member 3 is sealed and fixed to the area of ​​the terminal post assembly 2 with the welding surface 222 to cover the welding surface 222. There is a gap between the protective member 3 and the welding surface 222, or the protective member 3 is in contact with the welding surface 222. Specifically, the terminal post assembly 2 includes a first terminal post 21 and a second terminal post 22. The first connecting portion 211 of the first terminal post 21 and the second connecting portion 221 of the second terminal post 22 are welded and fixed to each other, so that a welding surface 222 is formed on the side of the second connecting portion 221 of the second terminal post 22 facing the battery cell. This welding method adopts ultrasonic welding or laser welding, and the second terminal post 22 includes a protrusion 22. 3. The convex bulge 223 forms a second connecting portion 221 and a cavity 224 located below the second connecting portion 221. After the second connecting portion 221 is welded and fixed to the first connecting portion 211 of the first electrode post 21, a welding mark is formed on the side of the second connecting portion 221 facing the cavity 224, so that the side with the welding mark serves as the welding surface 222. Therefore, based on the above structure, a battery top cover with positive and negative electrodes can be formed. The number of mounting holes 11 provided on the cover plate 1 is two, and the two... Each mounting hole 11 contains a terminal assembly 2. In one mounting hole 11, the first terminal 21 of the terminal assembly 2 is made of aluminum, and the second terminal 22 is made of copper. In the other mounting hole 11, both the first terminal 21 and the second terminal 22 are made of aluminum. The protective component 3 is located at the opening of the cavity 224 of the copper second terminal 22, and its outer edge is welded to the edge of the opening of the cavity 224 of the copper second terminal 22 to seal the cavity 224. Therefore, by using the protective component 3 to cover the welding surface 222 of the copper second terminal 22, the welding surface 222 is isolated from the electrolyte in the battery, preventing the electrolyte from contacting the welding surface 222. This avoids the risk of aluminum reacting with Li ions in the electrolyte at low voltage (negative electrode) to form a Li-AL alloy, which could detach over time, causing a short circuit and explosion. This makes the battery safer to use.

[0023] Preferably, the cavity 224 of the copper second pole post 22 has a continuous annular fixing recess 226 at its edge. The outer edge of the protective member 3 is positioned within the annular fixing recess 226, and the inner wall of the annular fixing recess 226 is welded and fixed to the outer edge of the protective member 3. The protective member 3 is a copper sheet with a thickness of 0.2mm-1.5mm. Its structural design allows the protective member 3 to be fixed more stably, improves the compactness of the structure, and reduces the thickness of the battery top cover.

[0024] Preferably, the second pole post 22 further includes an annular protrusion 225 continuously disposed on the outer periphery of the protrusion 223. A sealing ring 23 is sleeved on the protrusion 223. The sealing ring 23 is clamped between the annular protrusion 225 and the back of the cover plate 1. The annular protrusion 225 and the protrusion 223 are combined into an integral structure, so that the pole post assembly 2 is sealed after being installed in the mounting hole 11.

[0025] Preferably, the pole assembly 2 further includes an upper insulating member 24, which is clamped between the area with the mounting hole 11 on the front of the cover plate 1 and the first pole 21. The upper insulating member 24 is made of plastic, thereby insulating the front of the top cover from the first pole 21. The inner hole 242 of the upper insulating member 24 has a downward protruding positioning ring 243 that is inserted into the pole hole. The outer peripheral wall of the positioning ring 243 abuts against the inner peripheral wall of the pole hole. The positioning ring 243 makes the positioning of the upper insulating member 24 more stable and reliable.

[0026] Preferably, the area on the front of the cover plate 1 with the mounting hole 11 is provided with an annular positioning part surrounding the outer peripheral wall of the upper insulating member 24. The outer edge of the upper insulating member 24 forms a continuous and protruding annular limiting part 241. The outer peripheral wall of the first pole post 21 abuts against the inner wall of the annular limiting part 241. The outer wall of the annular limiting part 241 and the outer peripheral wall of the first upper insulating member 24 are both abutting against the inner wall of the annular positioning part. Furthermore, the annular limiting part 241, the annular positioning part, and the first upper insulating member 24 are all polygonal structures, which are generally square. This structural arrangement ensures that the first pole post 21 is reliably positioned and improves the torsional resistance of the pole post after installation.

[0027] More preferably, the annular positioning portion includes an annular positioning protrusion 13, the inner wall of which abuts against the outer peripheral wall of the upper insulating member 24 and the annular limiting portion 241.

[0028] More preferably, the annular positioning portion includes a positioning recess 12 that is adapted to the shape of the upper insulating member 24, and the upper insulating member 24 is fitted in the positioning recess 12, with the inner wall of the positioning recess 12 abutting against the outer periphery of the upper insulating member 24.

[0029] In the above, the annular positioning protrusion 13 and the positioning recess 12 can be combined to form one another, or only one of them can be set. The positioning effect is better when both the annular positioning protrusion 13 and the positioning recess 12 are set at the same time.

[0030] Preferably, a lower insulating member 5 is fixed to the back of the cover plate 1. The lower insulating member 5 is provided with a through hole 51 corresponding to the mounting hole 11 so that the sealing ring 23 is located in the through hole 51. The part of the lower insulating member 5 located on the inner wall of the through hole 51 is clamped by the annular protrusion 225 and the cover plate 1. A connecting piece 4 is connected to the annular protrusion 225. The lower insulating member 5 is made of plastic and insulates the back of the cover plate 1. The connecting piece 4 is generally made of copper.

[0031] Preferably, the annular protrusion 225 is provided with a fixing step 228 and a fixing boss 227 on its outer periphery, and the connecting piece 4 is provided with a fixing hole 41. The fixing boss 227 is positioned in the fixing hole 41 and is fixed to each other by laser welding or ultrasonic welding. The fixing step 228 limits the connecting piece 4. Its structural design makes the connecting piece 4 more stable and reliable, and improves the compactness of the structure.

Claims

1. A protective battery top cover, characterized in that, include: Cover plate (1), the cover plate (1) is provided with mounting holes (11); The terminal assembly (2) is at least partially installed in the mounting hole (11), and a welding surface (222) is formed on the side of the terminal assembly (2) facing the cell inside the battery. The protective component (3) is sealed and fixed to the area with a welding surface (222) on the pole assembly (2) to cover the welding surface (222). There is a gap between the protective component (3) and the welding surface (222), or the protective component (3) and the welding surface (222) are in contact with each other.

2. The protective battery top cover according to claim 1, characterized in that, The electrode assembly (2) includes a first electrode (21) and a second electrode (22). The first connecting part (211) of the first electrode (21) and the second connecting part (221) of the second electrode (22) are welded and fixed to each other so that a welding surface (222) is formed on the connecting part of the second electrode (22) facing the cell inside the battery.

3. The protective battery top cover according to claim 2, characterized in that, The second pole post (22) includes a convex hull (223), which forms a second connecting portion (221) and a cavity (224) located below the second connecting portion (221). After the second connecting portion (221) is welded and fixed to the first connecting portion (211) of the first pole post (21), a welding mark is formed on the side of the second connecting portion (221) facing the cavity (224), so that the side with the welding mark is used as the welding surface (222).

4. The protective battery top cover according to claim 3, characterized in that, The cover plate (1) has two mounting holes (11), and each mounting hole (11) has a pole post assembly (2). The first pole post (21) of the pole post assembly (2) in one mounting hole (11) is made of aluminum and the second pole post (22) is made of copper. The first pole post (21) and the second pole post (22) of the pole post assembly (2) in the other mounting hole (11) are both made of aluminum. The protective member (3) is located at the cavity (224) opening of the copper second pole post (22), and the outer edge of the protective member (3) is welded and fixed to the edge of the cavity (224) opening of the copper second pole post (22) to seal the cavity (224).

5. The protective battery top cover according to claim 4, characterized in that, The cavity (224) of the copper second pole post (22) has a continuous annular fixing recess (226) at its edge. The outer edge of the protective component (3) is positioned in the annular fixing recess (226), and the inner wall of the annular fixing recess (226) is welded and fixed to the outer edge of the protective component (3). The protective component (3) is a copper sheet.

6. The protective battery top cover according to claim 4, characterized in that, The second pole post (22) also includes an annular protrusion (225) continuously disposed on the outer periphery of the protrusion (223), and a sealing ring (23) is sleeved on the protrusion (223), and the sealing ring (23) is clamped between the annular protrusion (225) and the back of the cover plate (1).

7. The protective battery top cover according to any one of claims 2-6, characterized in that, The pole assembly (2) also includes an upper insulating member (24), which is clamped between the area with mounting holes (11) on the front of the cover plate (1) and the first pole (21).

8. The protective battery top cover according to claim 7, characterized in that, The cover plate (1) has an annular positioning part around the outer peripheral wall of the upper insulating member (24) in the area with the mounting hole (11) on the front side. The outer edge of the upper insulating member (24) forms a continuous and protruding annular limiting part (241). The outer peripheral wall of the first pole post (21) abuts against the inner wall of the annular limiting part (241). The outer wall of the annular limiting part (241) and the outer peripheral wall of the first upper insulating member (24) are both abutted against the inner wall of the annular positioning part. The annular limiting part (241), the annular positioning part and the first upper insulating member (24) are all polygonal structures.

9. The protective battery top cover according to claim 6, characterized in that, The cover plate (1) has a lower insulating member (5) fixed on its back side. The lower insulating member (5) has a through hole (51) corresponding to the mounting hole (11) so that the sealing ring (23) is located in the through hole (51). The part of the lower insulating member (5) located on the inner wall of the through hole (51) is clamped by the annular protrusion (225) and the cover plate (1). A connecting piece (4) is connected to the annular protrusion (225).

10. The protective battery top cover according to claim 9, characterized in that, The annular protrusion (225) is provided with a fixed step (228) and a fixed boss (227) on its outer periphery. The connecting piece (4) is provided with a fixed hole (41). The fixed boss (227) is positioned in the fixed hole (41) and welded to each other. The fixed step (228) limits the connecting piece (4).

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