Top cover of battery and battery
By designing large areas of positive electrode welding blocks and negative electrode welding blocks on the battery roof, the problems of poor heat dissipation performance and large impedance of lithium-ion power batteries are solved, and more efficient heat dissipation and overcurrent are achieved, the risk of thermal runaway is reduced, and the welding process is simplified.
Patent Information
- Application Number
- CN202422169970.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-04
AI Technical Summary
The size of the positive and negative ears of existing lithium-ion power batteries is limited, resulting in poor heat dissipation performance and large impedance, which can easily cause heat accumulation and battery thermal runaway.
A battery ceiling is designed, and a positive electrode welding block and a negative electrode welding block extend in the X direction and are arranged at intervals in the Y direction, increasing the overcurrent and heat dissipation area, and isolating the electrode ears through an insulating structure to avoid short circuits and simplifying the welding process.
It improves the heat dissipation performance and overcurrent area of the battery, reduces the risk of thermal runaway, reduces impedance, and improves production efficiency.
Smart Images
Figure CN223230480U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery. Background Art
[0002] At present, lithium-ion power batteries mainly include an aluminum shell, battery cells and a top cover, among which the number of battery cells is generally 1-4. All battery cells are accommodated in the aluminum shell, and the top cover seals the notch of the aluminum shell so that the battery cells are sealed inside the aluminum shell. Specifically, the top of the top cover is provided with a positive electrode column and a negative electrode column. Before installation, a positive electrode adapter will be pre-welded to the positive electrode ear of the battery cell, and a negative electrode adapter will be pre-welded to the negative electrode ear of the battery cell. During installation, the positive electrode adapter of the battery cell is welded to the positive electrode column, and the negative electrode adapter of the battery cell is welded to the negative electrode column, thereby achieving the purpose of leading the positive and negative poles of the internal battery cell outward to the two poles on the top of the top cover, thereby realizing the function of the internal battery cell being able to discharge externally or charge internally.
[0003] At present, the positive and negative ears of the battery cell are arranged at intervals along the length direction of the battery cell. This structural design limits the size of the positive and negative ears. That is, the size of the positive and negative ears led out of the battery cell is relatively small. When the battery cell is charged or discharged at a high rate, due to the small size of the positive and negative ears, the flow area and heat dissipation area of the battery cell are relatively small, resulting in heat accumulation at the positive and negative ears and the positive and negative poles, which in turn causes the battery temperature to rise sharply and easily triggers thermal runaway or explosion of the battery. In addition, the small flow area will result in a smaller path for the collector electrons, which in turn leads to a larger battery impedance. Utility Model Content
[0004] The purpose of the utility model is to provide a battery top cover and a battery, mainly to solve the technical problems of poor heat dissipation performance and large impedance of existing battery cells.
[0005] To achieve this purpose, the present invention adopts the following technical solutions:
[0006] A top cover of a battery, comprising a cover plate body, a positive electrode column, a negative electrode column, a positive electrode welding block and a negative electrode welding block;
[0007] The positive electrode column and the negative electrode column are respectively insulated and connected to the cover plate body and are both exposed at the top of the cover plate body. The positive electrode welding block and the negative electrode welding block are also respectively insulated and connected to the cover plate body and connected to the bottom of the cover plate body. The positive electrode welding block is connected to the positive electrode column and is used to be connected to the positive electrode tab of the battery cell. The negative electrode welding block is connected to the negative electrode column and is used to be connected to the negative electrode tab of the battery cell.
[0008] Assuming that the length direction of the cover plate body is the X direction and the width direction of the cover plate body is the Y direction, the positive electrode welding block and the negative electrode welding block both extend in the X direction and are finally arranged at intervals along the Y direction.
[0009] In one technical solution, the top cover of the battery further includes a lower plastic part, which is located between the cover plate body and the positive electrode welding block to separate the cover plate body and the positive electrode welding block. The lower plastic part is also located between the cover plate body and the negative electrode welding block to separate the cover plate body and the negative electrode welding block.
[0010] The top cover of the battery also includes a blocking member protruding downward from the bottom of the lower plastic part, the blocking member is an insulating member, and the blocking member separates the positive electrode welding block and the negative electrode welding block in the Y direction. The blocking member and the lower plastic part are an integral structure or a split structure, and the blocking member is used to separate the positive electrode ear and the negative electrode ear.
[0011] In one of the technical solutions, a downwardly open hollow hole is provided in the middle of the blocking member, a penetrating exhaust hole is provided at a position corresponding to the hollow hole of the cover plate body, an explosion-proof valve is installed at the exhaust hole of the cover plate body, and a connecting hole is provided at a position corresponding to the hollow hole of the lower plastic member, and the connecting hole connects the exhaust hole and the hollow hole.
[0012] In one of the technical solutions, the blocking member has an annular shape, so that the hollow hole also has an annular shape. A penetrating liquid injection hole is provided on the cover body, and the liquid injection hole is arranged at a position corresponding to the hollow hole and is connected to the hollow hole.
[0013] In one of the technical solutions, two positioning blocks are protruding downward from the bottom surface of the lower plastic part, and the two positioning blocks are located on the outside of the blocking part. One of the positioning blocks is used to limit the position of the positive electrode welding block, and the other positioning block is used to limit the position of the negative electrode welding block.
[0014] In one technical solution, the positive electrode welding block is provided with a first through-hole, the negative electrode welding block is provided with a second through-hole, the lower plastic part is provided with a first through-hole position at a position corresponding to the first welding hole, and the lower plastic part is provided with a second through-hole position at a position corresponding to the second welding hole, the bottom end of the first welding hole is provided with a first chamfer structure, and the bottom end of the second welding hole is provided with a second chamfer structure;
[0015] The positive electrode column is sequentially inserted into the first welding hole and the first hole position and welded to the positive electrode welding block at the first chamfered structure. The negative electrode column is sequentially inserted into the second welding hole and the second hole position and welded to the negative electrode welding block at the second chamfered structure.
[0016] In one of the technical solutions, a plurality of heat dissipation grooves are provided on the top surface of the positive electrode welding block or the negative electrode welding block, and the length direction of the heat dissipation grooves is toward the X direction.
[0017] The present application also provides a battery, comprising a shell, a battery cell, and a top cover of the battery according to any of the above technical solutions, wherein an open mounting groove is provided in the shell, the battery cell is accommodated in the mounting groove, the cover plate body of the battery top cover seals the notch of the mounting groove, the battery cell is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab also extend along the X direction and are ultimately arranged at intervals along the Y direction, the positive electrode tab is connected to the positive electrode welding block, and the negative electrode tab is connected to the negative electrode welding block.
[0018] In one technical solution, the length of the positive electrode tab along the X direction and the length of the negative electrode tab along the X direction are both 50% to 90% of the length of the battery cell along the X direction.
[0019] In one technical solution, the blocking member protrudes downward from the bottom surface of the lower plastic member by a height value A, the distance between the lower plastic member and the top surface of the battery cell is B, and A is greater than or equal to half of B.
[0020] Compared with the prior art, the battery top cover provided by the present invention has at least the following beneficial effects:
[0021] This solution improves the top cover of the battery. A positive electrode welding block for welding to the positive tab and a negative electrode welding block for welding to the negative tab are provided on the top cover. Since the positive electrode welding block and the negative electrode welding block both extend along the X direction and are ultimately spaced apart along the Y direction, the conductive area of the positive electrode welding block and the negative electrode welding block is large. Correspondingly, the size of the positive and negative tabs on the battery cell can also be adaptively increased, thereby significantly increasing the battery's flow area and heat dissipation area, thereby improving the battery's heat dissipation performance. During high-rate charge and discharge, the battery will not accumulate excessive heat quickly, thereby reducing the risk of thermal runaway of the battery. Moreover, due to the increased flow area, the battery's impedance is also reduced.
[0022] In addition, since the positive electrode welding block and the negative electrode welding block of the present solution have a larger area, the positive electrode ear on the battery cell can be directly welded to the positive electrode welding block, so that the positive electrode ear can be more stable after welding. Similarly, the negative electrode ear on the battery cell can be directly welded to the negative electrode welding block, so that the negative electrode ear can be more stable after welding. In other words, by adopting this solution, the positive electrode ear and the negative electrode ear on the battery cell do not need to be pre-welded with an adapter. The positive electrode welding block and the negative electrode welding block of the present solution can be equivalent to two traditional adapters. The present solution only requires one welding to achieve electrical connection between the electrode ear and the pole, without the need to first weld an adapter on the electrode ear and then weld the adapter to the pole of the top cover. Therefore, the positive electrode ear and the negative electrode ear of the present solution save one welding process in the process of connecting with the top cover, which is beneficial to improving the production efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0024] Figure 1 A schematic structural diagram of a battery provided in an embodiment of the present application;
[0025] Figure 2 for Figure 1 An exploded view of the battery shown;
[0026] Figure 3 A schematic diagram of the structure of the top cover provided in an embodiment of the present application;
[0027] Figure 4 An exploded view of the structure of the top cover provided in an embodiment of the present application;
[0028] Figure 5 for Figure 1 a top view of the battery shown;
[0029] Figure 6 for Figure 5 Cross-sectional view at AA in the middle;
[0030] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;
[0031] Figure 8 for Figure 5 Cross-sectional view at the middle BB;
[0032] Figure 9 for Figure 8A partial enlarged view of point D in the middle.
[0033] Among them, the reference numerals in the figures are:
[0034] 1. Housing; 11. Mounting slot; 2. Battery cell; 21. Positive tab; 22. Negative tab;
[0035] 3. Top cover; 30. Heat dissipation slot; 31. Cover body; 311. Exhaust hole; 312. Liquid injection hole; 32. Positive column; 33. Negative column; 34. Positive electrode welding block; 341. First welding hole; 342. First chamfer structure; 35. Negative electrode welding block; 351. Second welding hole; 352. Second chamfer structure; 36. Lower plastic part; 361. Connecting hole; 362. First hole position; 363. Second hole position; 37. Blocking piece; 371. Hollow hole; 38. Positioning block. DETAILED DESCRIPTION
[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0037] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0038] It should be understood that the terms, "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0039] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0040] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
[0041] Please also refer to Figure 1and Figure 2 This embodiment provides a battery, which includes a shell 1, a battery cell 2 and a top cover 3, wherein the shell 1 is generally a metal aluminum shell, an open mounting groove 11 is provided in the shell 1, and the battery cell 2 is accommodated in the mounting groove 11, and the top cover 3 is used to seal the notch of the mounting groove 11, so that the battery cell 2 is sealed inside the shell 1, and a positive electrode column 32 and a negative electrode column 33 are provided on the top cover 3. A positive electrode tab 21 and a negative electrode tab 22 are led out from the battery cell 2, the positive electrode tab 21 is connected to the positive electrode column 32, and the negative electrode tab 22 is connected to the negative electrode column 33, so that the top cover 3 leads the positive and negative electrodes of the battery cell 2 outward to facilitate discharging or charging of the battery cell 2.
[0042] Please also refer to Figures 1 to 9 The top cover 3 specifically includes a cover body 31, a positive electrode column 32, a negative electrode column 33, a positive electrode welding block 34 and a negative electrode welding block 35, wherein the cover body 31 is generally also a metal aluminum shell, and the positive electrode column 32 and the negative electrode column 33 are exposed at the top of the cover body 31. The positive electrode column 32 and the negative electrode column 33 are exposed to the outside relative to the top of the cover body 31. It is understood that the positive electrode column 32 or the negative electrode column 33 can protrude from the top surface of the cover body 31, and the positive electrode column 32 or the negative electrode column 33 can also be lower than the top surface of the cover body 31. The positive electrode column 32 and The negative electrode post 33 is insulated and sealed from the cover body 31 by clamping one or more insulating members therebetween, preventing the cover body 31 from becoming charged and potentially causing a short circuit. The positive and negative electrode welding blocks 34, 35 are both located at the bottom of the cover body 31 and are insulated from the cover body 31, similarly preventing the cover body 31 from becoming charged and potentially causing a short circuit. The positive welding block 34 is welded to the positive electrode post 32, and the negative welding block 35 is welded to the negative electrode post 33. During installation, simply weld the positive tab 21 on the battery cell 2 to the positive welding block 34 to transfer the polarity of the positive tab 21 to the positive electrode post 32. Then, simply weld the negative tab 22 on the battery cell 2 to the negative welding block 35 to transfer the polarity of the negative tab 22 to the negative electrode post 33.
[0043] Please refer to the Figures 1 to 9 Assuming that the length direction of the cover plate body 31 is the X direction and the width direction of the cover plate body 31 is the Y direction, in this embodiment, the positive electrode welding block 34 and the negative electrode welding block 35 both extend in the X direction and are ultimately spaced apart along the Y direction. Correspondingly, the positive electrode tab 21 welded to the positive electrode welding block 34 also extends along the X direction, and the negative electrode tab 22 welded to the negative electrode welding block 35 also extends along the X direction, so that the positive electrode tab 21 and the negative electrode tab 22 are ultimately spaced apart along the Y direction.
[0044] Through such a design in the upper section, the conductive area of the positive electrode welding block 34, the negative electrode welding block 35, the positive electrode ear 21 and the negative electrode ear 22 can be increased in the X direction, thereby greatly improving the flow area and heat dissipation area of the battery, thereby improving the heat dissipation performance of the battery. During the high-rate charge and discharge process of the battery, heat will not accumulate too quickly, thereby reducing the risk of thermal runaway of the battery. Moreover, since the flow area becomes larger, the impedance of the battery is also reduced. In addition, since the positive electrode welding block 34, the negative electrode welding block 35, the positive electrode ear 21 and the negative electrode ear 22 of the present solution have a large area, the positive electrode ear 21 on the battery cell 2 can be directly welded to the positive electrode welding block 34, so that the positive electrode ear 21 is more stable after welding. Similarly, the negative electrode ear 22 on the battery cell 2 can be directly welded to the negative electrode welding block 35, so that the negative electrode ear 22 is more stable after welding. In other words, by adopting the present solution, both the positive electrode ear 21 and the negative electrode ear 22 on the battery cell 2 do not need to be pre-welded with an adapter. The positive electrode welding block 34 and the negative electrode welding block 35 of the present solution can be equivalent to two traditional adapters. The present solution only requires one welding to achieve electrical connection between the electrode ear and the pole, without the need to first weld a adapter on the electrode ear and then weld the adapter to the pole of the top cover. Therefore, the positive electrode ear 21 and the negative electrode ear 22 of the present solution save one welding process in the process of connecting with the top cover 3, which is beneficial to improving the production efficiency of the battery.
[0045] The battery cell 2 of this embodiment is preferably a wound battery cell. When the battery cell 2 is wound, in order to ensure that the positive ear 21 and the negative ear 22 can extend respectively on both sides along the Y direction, the battery cell 2 can first penetrate into one of the pole ears when it starts to be wound, and then penetrate into the other pole ear when the battery cell 2 is about to be wound. The positive ear 21 and the negative ear 22 can be pre-connected in the battery cell 2 by means of staggered penetration. When the positive ear 21 and the negative ear 22 are respectively connected to the top cover 3, the positive ear 21 or the negative ear 22 needs to be bent and shaped first, and the originally straight positive ear 21 or the negative ear 22 needs to be bent into an L shape. Then, a laser welding method is used to reserve the middle. The positive tab 21 is fixed to the positive electrode welding block 34 using a pressing block with a reserved laser welding hole in the middle, and the negative tab 22 is fixed to the negative electrode welding block 35 using a pressing block with a reserved laser welding hole in the middle. Finally, the positive tab 21 is welded to the positive electrode welding block 34 and the negative tab 22 is welded to the negative electrode welding block 35 by laser welding. Finally, the length of the positive tab 21 along the X direction and the length of the negative tab 22 along the X direction are both 50% to 90% of the length of the battery cell 2 along the X direction. Compared with the existing solution in which the positive tab 21 and the negative tab 22 each occupy 10% to 25% of the length of the battery cell 2 in the X direction, this solution obviously has a larger flow area and more heat dissipation area. In addition, please refer to Figure 4The top surface of the positive electrode welding block 34 and the top surface of the negative electrode welding block 35 are provided with multiple heat dissipation grooves 30, and the length direction of each heat dissipation groove 30 extends toward the X direction, thereby further increasing the heat dissipation area and flow area of the positive electrode welding block 34 and the negative electrode welding block 35, thereby further improving the heat dissipation performance of the battery.
[0046] Please also refer to Figures 1 to 9 The top cover 3 further includes a lower plastic part 36, which is located between the cover body 31 and the positive electrode welding block 34, and between the cover body 31 and the negative electrode welding block 35. The lower plastic part 36 is used to separate the cover body 31 from the positive electrode welding block 34, and the lower plastic part 36 is used to separate the cover body 31 from the negative electrode welding block 35, so that the electrical properties carried by the positive electrode welding block 34 and the negative electrode welding block 35 are not transmitted to the cover body 31. In other embodiments, the insulation between the cover body 31 and the two welding blocks can be achieved by applying a layer of insulating paint on the bottom surface of the cover body 31, or by applying a layer of insulating paint on the side of the two welding blocks facing the cover body 31. Specifically, the top cover 3 of this embodiment further includes a stopper 37 projecting downwardly from the bottom of the lower plastic member 36. The stopper 37 is insulating and separates the positive electrode welding block 34 from the negative electrode welding block 35 in the Y direction, thereby separating the positive and negative tabs 21 and 22. This prevents the two tabs from being forced to bend and contact each other when the top cover 3 seals the mounting slot 11 of the housing 1. This reduces the risk of the positive and negative tabs 21 and 22 being electrically conductive and causing a short circuit. In this embodiment, the stopper 37 and the lower plastic member 36 are preferably integrally molded. This integrated molding approach offers lower manufacturing costs and higher assembly efficiency. Furthermore, assuming that the height of the stopper 37 projecting downwardly from the bottom surface of the lower plastic member 36 is A, and the distance between the lower plastic member 36 and the top surface of the battery cell 2 is B, A is preferably less than B but greater than or equal to half of B to prevent contact between the positive and negative tabs 21 and 22, thereby further reducing the risk of a short circuit within the battery.
[0047] Please also refer to Figures 3 to 9The blocking member 37 is provided with a downwardly open hollow hole 371 in the middle. The hollow hole 371 can reduce the weight of the blocking member 37, thereby reducing the overall weight of the battery and improving the battery's energy density. In addition, since the positive electrode welding block 34 and the negative electrode welding block 35 of this solution jointly occupy a large amount of space in the top cover 3, the cover body 31 can utilize the position corresponding to the hollow hole 371 to design the existing vent 311. The vent 311 is generally installed at the vent valve. Correspondingly, the lower plastic member 36 has a through-hole 361 at the position corresponding to the hollow hole 371. The through-hole 361 can connect the hollow hole 371 and the vent 311. When the internal pressure of the battery is too high, the gas inside the battery will pass through the hollow hole 371, the connecting hole 361, and the vent 311 in sequence, break through the explosion-proof valve, and be exhausted to the outside, thereby achieving the purpose of external pressure relief of the battery.
[0048] Please also refer to Figures 3 to 9 The outer shape of the blocking member 37 is an annular structure, so that the shape of the above-mentioned hollow hole 371 is also annular. A penetrating liquid injection hole 312 is also provided on the cover body 31. The liquid injection hole 312 is used for an external injection tool to inject electrolyte into the battery. The liquid injection hole 312 is arranged at a position corresponding to the hollow hole 371 and is downwardly connected to the hollow hole 371. Since the blocking member 37 is annular, when the injection tool is inserted into the injection hole 312 and the electrolyte is injected, bubbles that may appear at the liquid outlet of the injection tool will be blocked by the blocking member 37. When the bubbles burst, they will not splash onto the positive welding block 34 and the negative welding block 35, and the bubbles will not stick to the positive welding block 34 and the negative welding block 35, thereby greatly reducing the risk of short circuit caused by the positive welding block 34 and the negative welding block 35 being conductive when injecting liquid into the battery.
[0049] See also Figure 3 The bottom surface of the lower plastic part 36 is provided with two positioning blocks 38 protruding downward. The positioning blocks 38 are located outside the blocking member 37. During assembly, the positive electrode welding block 34 abuts against one of the positioning blocks 38 to limit the position of the positive electrode welding block 34 and improve the positioning accuracy of the positive electrode welding block 34 relative to the lower plastic part 36. The positive electrode welding block 34 is then welded to the positive electrode column 32. Similarly, the negative electrode welding block 35 abuts against the other positioning block 38 to limit the position of the negative electrode welding block 35 and improve the positioning accuracy of the negative electrode welding block 35 relative to the lower plastic part 36. The negative electrode welding block 35 is then welded to the negative electrode column 33. The positioning blocks 38 can also limit the position of the positive electrode tab 21 or the negative electrode tab 22, ensuring that the positive electrode tab 21 can be welded to the positive electrode welding block 34 by being positioned by the positioning blocks 38, and also ensuring that the negative electrode tab 22 can be welded to the negative electrode welding block 35 by being positioned by the positioning blocks 38.
[0050] Please also refer to Figure 3and Figure 4 The positive electrode welding block 34 is provided with a first welding hole 341 that passes through it, and the negative electrode welding block 35 is provided with a second welding hole 351 that passes through it. The lower plastic part 36 is provided with a first hole position 362 that passes through it at a position corresponding to the first welding hole 341, and a second hole position 363 that passes through it at a position corresponding to the second welding hole 351. The bottom end of the first welding hole 341 is provided with a first chamfered structure 342, and the bottom end of the second welding hole 351 is provided with a second chamfered structure 352. The positive electrode column 32 passes through the first welding hole 341 and the first hole position 362 from top to bottom in sequence and is welded to the positive electrode welding block 34 at the first chamfered structure 342. The negative electrode column 33 passes through the second welding hole 351 and the second hole position 363 from top to bottom in sequence and is welded to the negative electrode welding block 34 at the second chamfered structure 352. The connection block 35 is welded. Through such a design, even if the positive electrode welding block 34 and the negative electrode welding block 35 are larger in size and heavier in weight, the firmness of the positive electrode welding block 34 and the positive electrode column 32 after welding can still be ensured, and the firmness of the negative electrode welding block 35 and the negative electrode column 33 after welding can still be ensured. At the same time, by providing the first welding hole 341, the contact area between the positive electrode welding block 34 and the positive electrode column 32 can be increased, which is also conducive to the rapid dissipation of heat and the increase of the flow area; similarly, by providing the second welding hole 351, the contact area between the negative electrode welding block 35 and the negative electrode column 33 can be increased, which is also conducive to the rapid dissipation of heat and the increase of the flow area; the first welding hole 341 and the second welding hole 351 can also be filled with thermal conductive glue to further enhance the heat dissipation capacity of the battery. To further improve the firmness of the positive electrode welding block 34 and the negative electrode welding block 35 , the positive electrode welding block 34 can be riveted to the positive electrode column 32 before welding, and the negative electrode welding block 35 can be riveted to the negative electrode column 33 before welding.
[0051] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.
Claims
1. A battery top cover, characterized in that: It includes a cover plate body (31), a positive electrode column (32), a negative electrode column (33), a positive electrode welding block (34) and a negative electrode welding block (35); The positive electrode column (32) and the negative electrode column (33) are respectively insulated and connected to the cover plate body (31) and are both exposed at the top of the cover plate body (31); the positive electrode welding block (34) and the negative electrode welding block (35) are also respectively insulated and connected to the cover plate body (31) and are connected to the bottom of the cover plate body (31); the positive electrode welding block (34) is connected to the positive electrode column (32) and is used to be connected to the positive electrode ear of the battery cell; the negative electrode welding block (35) is connected to the negative electrode column (33) and is used to be connected to the negative electrode ear of the battery cell; Assuming that the length direction of the cover plate body (31) is the X direction, and the width direction of the cover plate body (31) is the Y direction, the positive electrode welding block (34) and the negative electrode welding block (35) both extend in the X direction and are finally arranged at intervals along the Y direction.
2. The top cover of the battery according to claim 1, wherein: The top cover of the battery further includes a lower plastic part (36), the lower plastic part (36) being located between the cover plate body (31) and the positive electrode welding block (34) to separate the cover plate body (31) and the positive electrode welding block (34), and the lower plastic part (36) being located between the cover plate body (31) and the negative electrode welding block (35) to separate the cover plate body (31) and the negative electrode welding block (35); The top cover of the battery further includes a blocking member (37) protruding downward from the bottom of the lower plastic member (36), the blocking member (37) being an insulating member, the blocking member (37) separating the positive electrode welding block (34) and the negative electrode welding block (35) in the Y direction, and the blocking member (37) being used to separate the positive electrode ear and the negative electrode ear.
3. The top cover of the battery according to claim 2, wherein: A downwardly open hollow hole (371) is provided in the middle of the blocking member (37), a penetrating exhaust hole (311) is provided on the cover body (31) at a position corresponding to the hollow hole (371), an explosion-proof valve is installed on the cover body (31) at the exhaust hole (311), and a connecting hole (361) is provided on the lower plastic member (36) at a position corresponding to the hollow hole (371), the connecting hole (361) connecting the exhaust hole (311) and the hollow hole (371).
4. The top cover of the battery according to claim 3, wherein: The blocking member (37) has an annular shape, so that the hollow hole (371) also has an annular shape. A penetrating liquid injection hole (312) is provided on the cover plate body (31). The liquid injection hole (312) is arranged at a position corresponding to the hollow hole (371) and is in communication with the hollow hole (371).
5. The top cover of the battery according to claim 2, wherein: Two positioning blocks (38) are protruding downward from the bottom surface of the lower plastic part (36), and the two positioning blocks (38) are located outside the blocking part (37). One of the positioning blocks (38) is used to limit the position of the positive electrode welding block (34), and the other positioning block (38) is used to limit the position of the negative electrode welding block (35).
6. The top cover of the battery according to claim 2, wherein: The positive electrode welding block (34) is provided with a through first welding hole (341), the negative electrode welding block (35) is provided with a through second welding hole (351), the lower plastic part (36) is provided with a through first hole position (362) at a position corresponding to the first welding hole (341), the lower plastic part (36) is provided with a through second hole position (363) at a position corresponding to the second welding hole (351), the bottom end of the first welding hole (341) is provided with a first chamfer structure (342), and the bottom end of the second welding hole (351) is provided with a second chamfer structure (352); The positive electrode column (32) is sequentially passed through the first welding hole (341) and the first hole position (362) and is welded to the positive electrode welding block (34) at the first chamfered structure (342); the negative electrode column (33) is sequentially passed through the second welding hole (351) and the second hole position (363) and is welded to the negative electrode welding block (35) at the second chamfered structure (352).
7. The top cover of the battery according to claim 1, wherein: The top surface of the positive electrode welding block (34) or the negative electrode welding block (35) is provided with a plurality of heat dissipation grooves (30), and the length direction of the heat dissipation grooves (30) is oriented toward the X direction.
8. A battery, characterized in that: The invention comprises a shell (1), a battery cell (2) and a top cover (3) according to any one of claims 1 to 7, wherein an open mounting groove (11) is provided in the shell (1), the battery cell (2) is accommodated in the mounting groove (11), a cover plate body (31) of the top cover (3) seals the notch of the mounting groove (11), a positive electrode tab (21) and a negative electrode tab (22) are led out of the battery cell (2), the positive electrode tab (21) and the negative electrode tab (22) also extend along the X direction and are finally arranged at intervals along the Y direction, the positive electrode tab (21) is connected to the positive electrode welding block (34), and the negative electrode tab (22) is connected to the negative electrode welding block (35).
9. The battery according to claim 8, wherein The length of the positive electrode tab (21) along the X direction and the length of the negative electrode tab (22) along the X direction are both 50% to 90% of the length of the battery cell (2) along the X direction.
10. The battery according to claim 8, wherein The battery adopts the top cover (3) according to claim 2, the height value of the blocking member (37) protruding downward relative to the bottom surface of the lower plastic member (36) is A, the distance between the lower plastic member (36) and the top surface of the battery cell (2) is B, and A is less than B but greater than or equal to half of B.