A battery top cover and battery structure

Abstract

The utility model provides a battery top cover and a battery structure, the battery top cover comprises: a negative pole, a mounting assembly and a cover plate, the cover plate is provided with a negative pole mounting hole, the negative pole is mounted in the negative pole mounting hole through the mounting assembly; the negative pole is a copper-aluminum composite pole, comprising a copper part and an aluminum part; the mounting assembly comprises a welding ring and a sealing ring, the welding ring is sleeved and welded outside the copper part of the negative pole to mount the negative pole in the negative pole mounting hole, the composite interface of the copper part and the aluminum part of the negative pole and the aluminum part are both located on the side of the welding ring away from the cover plate; the sealing ring is sleeved outside the negative pole and is pressed tightly between the copper part of the negative pole and the cover plate. The utility model enables the elastic force of the sealing ring to act on the welding ring and the welding point, reducing the risk of the pole falling off after welding, and the negative pole is a copper-aluminum composite pole, which can effectively reduce the production cost of parts.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery structure. Background Art

[0002] In the existing technology, energy storage is developing rapidly, and lithium-ion batteries are widely used in electric vehicles, mobile electronic devices, energy storage and other fields. With the continuous expansion of battery application fields, higher requirements are put forward for the cost of battery top cover and the complexity of processing procedures.

[0003] In the prior art, the traditional assembly methods in the top cover structure are mainly injection molding and riveting. Among them, the negative pole of the riveted top cover is processed by friction welding of two materials. Due to the high processing cost of friction welding, it is difficult to reduce the price cost of the top cover, and the friction welding processing method has high requirements on the processing capabilities of the supplier, which increases the selection threshold of the supplier. In addition, the interface of the friction welding is always affected by the elastic force of the sealing ring and is prone to damage. At the same time, friction welding also has the possibility of cold welding and the risk of falling off. Utility Model Content

[0004] Based on this, it is necessary to provide a battery top cover and a battery structure to address the above technical problems.

[0005] A battery top cover comprises: a negative electrode column, a mounting assembly and a cover plate, wherein a negative electrode column mounting hole is formed on the cover plate, and the negative electrode column is mounted in the negative electrode column mounting hole through the mounting assembly; the negative electrode column is a copper-aluminum composite electrode column, comprising a copper portion and an aluminum portion; the mounting assembly comprises a welding ring and a sealing ring, the welding ring is sleeved and welded outside the copper portion of the negative electrode column to mount the negative electrode column in the negative electrode column mounting hole, and the composite interface between the copper portion and the aluminum portion of the negative electrode column and the aluminum portion are both located on a side of the welding ring away from the cover plate; the sealing ring is sleeved outside the negative electrode column and is pressed tightly between the copper portion of the negative electrode column and the cover plate.

[0006] In one of the embodiments, the copper portion of the negative electrode column includes a limit portion and an insertion portion connected to each other, and the sealing ring is sleeved outside the insertion portion and is pressed tightly between the limit portion and the cover plate.

[0007] In one embodiment, the width of the inserting portion of the copper portion is greater than the width of the aluminum portion, and the width of the inserting portion is less than the width of the limiting portion.

[0008] In one embodiment, the thickness of the aluminum portion of the negative electrode column is greater than 1 mm, and the thickness of the copper portion is greater than 1 mm, and the thickness of the copper portion is greater than the thickness of the aluminum portion.

[0009] In one of the embodiments, the inserting portion of the copper portion has a stamping forming mechanism, and a stamping groove is formed on a side of the limiting portion away from the inserting portion.

[0010] In one embodiment, the mounting assembly further includes an upper plastic and a lower plastic, the upper plastic is provided with a first through hole, the first through hole of the upper plastic is sleeved outside the insertion portion, and the upper plastic is pressed tightly between the welding ring and the cover plate; the lower plastic is provided with a second through hole, the second through hole of the lower plastic is sleeved outside the insertion portion, and the lower plastic is pressed tightly between the limiting portion and the cover plate.

[0011] In one of the embodiments, the cover plate is further provided with a first limiting groove on a side close to the upper plastic and located on the outer periphery of the negative pole mounting hole, and the first limiting groove is used to accommodate the upper plastic.

[0012] In one of the embodiments, a second limiting groove is further provided on the side of the cover plate away from the upper plastic and located on the outer periphery of the negative electrode column mounting hole, and the sealing ring is clamped between the second limiting groove and the limiting portion.

[0013] In one of the embodiments, the upper plastic is provided with a third limiting groove on a side close to the welding ring, and the third limiting groove is used for the welding ring to be clamped.

[0014] A battery structure comprises a battery cell, a shell for accommodating the battery cell, and a top cover sealed and mounted on the top of the shell, wherein the top cover is the battery top cover described above.

[0015] The above-mentioned battery top cover and battery structure, the negative electrode column is a copper-aluminum composite electrode column, including a copper part and an aluminum part, the installation assembly includes a welding ring and a sealing ring, the welding ring is sleeved and welded to the outside of the copper part of the negative electrode column to install the negative electrode column in the negative electrode column installation hole, the composite interface of the copper part and the aluminum part of the negative electrode column and the aluminum part are both located on the side of the welding ring away from the cover plate; the sealing ring is sleeved outside the negative electrode column and is pressed tightly between the copper part of the negative electrode column and the cover plate, so that the elastic force of the sealing ring acts on the welding ring and the welding point, reducing the risk of the electrode column falling off after welding, so as to effectively improve the safety performance of the product, and the negative electrode column is a copper-aluminum composite electrode, which can effectively reduce the production cost of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a battery top cover in one embodiment;

[0017] Figure 2 It is a schematic diagram of the structure decomposition of a battery top cover in one embodiment;

[0018] Figure 3 is a structural cross-sectional view of a battery top cover in one embodiment;

[0019] Figure 4 for Figure 3 A magnified view of point A;

[0020] Figure 5 A cross-sectional view of a negative electrode column in one embodiment. Description of the drawings:

[0022] 10. Battery top cover; 100. Negative pole; 110. Copper part; 111. Limiting part; 112. Inserting part; 120. Aluminum part; 113. Stamping groove; 200. Positive pole; 300. Mounting assembly; 310. Welding ring; 320. Sealing ring; 330. Upper plastic; 331. First through hole; 332. Third limiting groove; 340. Lower plastic; 341. Second through hole; 400. Cover plate; 401. Negative pole mounting hole; 402. Negative pole mounting hole; 403. First limiting groove; 404. Second limiting groove; 405. Explosion-proof hole; 406. Injection hole; 500. Explosion-proof disk. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred implementation methods of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the implementation methods described herein. On the contrary, the purpose of providing these implementation methods is to make the disclosure of the present application more thoroughly and comprehensively understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined. It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used herein are only for the purpose of describing specific implementation methods and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] In a first aspect, the present application provides a battery top cover.

[0025] In one embodiment, if Figures 1 to 5 As shown, a battery top cover 10 is provided, comprising: a negative electrode column 100, a positive electrode column 200, two mounting components 300 and a cover plate 400, wherein the cover plate 400 is provided with a negative electrode column mounting hole 401 and a positive electrode column mounting hole 402, wherein the negative electrode column 100 is mounted in the negative electrode column mounting hole 401 through one mounting component 300; and the positive electrode column 200 is mounted in the positive electrode column mounting hole through another mounting component 300. Figure 4 and Figure 5As shown, the negative electrode column 100 is a copper-aluminum composite electrode column, including a copper part 110 and an aluminum part 120; the mounting assembly 300 includes a welding ring 310 and a sealing ring 320, the welding ring 310 is sleeved and welded on the outside of the copper part 110 of the negative electrode column 100 to install the negative electrode column 100 in the negative electrode column mounting hole 401, and the composite interface between the copper part 110 and the aluminum part 120 of the negative electrode column 100 and the aluminum part 120 are both located on the side of the welding ring 310 away from the cover plate 400; that is, when the battery top cover 10 is installed on the shell, the side facing the bare battery cell in the shell is the lower side, and the side away from the bare battery cell in the shell is the upper side; specifically, the composite interface between the copper part 110 and the aluminum part 120 and the aluminum part 120 are both located above the welding ring 310. The sealing ring 320 is sleeved outside the negative electrode column 100 and is pressed tightly between the copper part 110 of the negative electrode column 100 and the cover plate 400; that is, the elastic force of the sealing ring 320 always acts on the welding point between the welding ring 310 and the copper part 110 and the welding ring 310, so that the elastic force of the sealing ring 320 does not affect the composite interface of the copper part 110 and the aluminum part 120.

[0026] In one embodiment, the negative electrode 100 adopts a copper-aluminum composite electrode, which saves the use of copper material and reduces the assembly cost while meeting the electrode assembly requirements. In addition, the welding ring 310 is sleeved and welded to the outside of the copper part 110 of the negative electrode 100, and the composite interface of the copper part 110 and the aluminum part 120 and the aluminum part 120 are both located on the side of the welding ring 310 away from the cover plate, and the sealing ring 320 is always pressed between the copper part 110 and the cover plate 400, so that the elastic force of the sealing ring 320 acts on the welding point between the welding ring 310 and the copper part 110 and on the welding ring 310, and does not affect the composite interface of the copper part 110 and the aluminum part 120, thereby avoiding the risk of the copper part 110 and the aluminum part 120 of the negative electrode 100 falling off, thereby improving the safety performance of the product.

[0027] In one embodiment, see 4 and Figure 5 As shown, the copper portion 110 of the negative electrode column 100 includes a limit portion 111 and an insertion portion 112 connected to each other, and the sealing ring 320 is sleeved outside the insertion portion 112 and pressed tightly between the limit portion 111 and the cover plate 400 .

[0028] In one embodiment, the copper part 110 includes a limit portion 111 and an insertion portion 112 connected to each other, a welding ring 310 is sleeved and welded outside the insertion portion 112 to install the negative electrode column 100 in the negative electrode column installation hole 401; and a sealing ring 320 is sleeved outside the insertion portion 112 and abutted between the limit portion 111 and the cover plate 400. In this embodiment, the limit portion 111 and the insertion portion 112 structure adopted by the copper part 110 cooperate with the installation assembly 300 to ensure that the negative electrode column 100 is stably installed on the cover plate 400, thereby reducing the risk of the negative electrode column 100 falling off.

[0029] In one embodiment, continue to refer to Figure 5 As shown, the copper part 110 of the negative electrode 100 includes a limit part 111 and an insertion part 112 connected to each other, wherein the insertion part 112 is in a cylindrical shape, or in other words, the insertion part 112 has a circular cross-section, and the insertion part 112 is provided with a circular welding hole, and the side wall of the circular welding hole is used for welding a connecting piece or a pole ear, so that the welding connection position of the pole is accommodated in the internal space of the pole, reducing the waste of height space caused by welding.

[0030] In one embodiment, continue to refer to Figure 4 and Figure 5 As shown, the width of the inserting portion 112 of the copper portion 110 is greater than the width of the aluminum portion 120 , and the width of the inserting portion 112 is less than the width of the limiting portion 111 .

[0031] In one embodiment, the aluminum part 120 is cylindrical, and the inserting part 112 is also cylindrical, so the diameter of the inserting part 112 is greater than the diameter of the aluminum part, and the diameter of the inserting part 112 is less than the width of the limiting part 111. In this embodiment, the integration of the aluminum part 120 and the copper part 110 is improved by setting the width range of the inserting part 112, the aluminum part 120, and the inserting part 112, and the connection stability of the aluminum part 120 and the copper part 110 is ensured.

[0032] In one embodiment, the thickness of the aluminum portion 120 of the negative electrode column 100 is greater than 1 mm, and the thickness of the copper portion 110 is greater than 1 mm, and the thickness of the copper portion 110 is greater than the thickness of the aluminum portion 120 .

[0033] In one embodiment, by setting the thickness of the aluminum part 120 and the copper part 110 of the negative electrode column 100, it is ensured that when the negative electrode column 100 is assembled to the cover plate 400, the welding ring 310 is always welded to the copper part 110, and the composite interface between the copper part 110 and the aluminum part 120 is located above the welding ring, so as to avoid the elastic force of the sealing ring 320 acting on the composite interface between the copper part 110 and the aluminum part 120.

[0034] In one embodiment, see Figure 5 As shown, the inserting portion 112 of the copper part 110 has a stamping forming mechanism, and the inserting portion 112 is formed with a stamping groove 113 on the side of the limiting portion 111 away from the inserting portion 112. In one embodiment, the copper part 110 is stamped, the forming process is simple, and the assembly cost is reduced. And the stamping groove 113 formed by the limiting portion 112 is convenient for welding with the connecting piece; further, a boss matching the stamping groove can be formed by stamping on the connecting piece to achieve welding of the connecting piece and the pole without additionally increasing the entire vertical height.

[0035] In one embodiment, see Figures 2 to 4 As shown, the mounting assembly 300 further includes an upper plastic 330 and a lower plastic 340, the upper plastic 330 is provided with a first through hole 331, the first through hole 331 of the upper plastic 330 is sleeved outside the insertion portion 112, and the upper plastic 330 is pressed tightly between the welding ring 310 and the cover plate 400; the lower plastic 340 is provided with a second through hole 341, the second through hole 341 of the lower plastic 340 is sleeved outside the insertion portion 112, and the lower plastic 340 is pressed tightly between the limiting portion 111 and the cover plate 400.

[0036] In one embodiment, a welding ring 310 is sleeved and welded to the outside of the insertion portion 112 of the negative electrode column 100 to ensure that the upper plastic 330 is pressed tightly between the welding ring 310 and the cover plate 400, the sealing ring 320 is pressed tightly between the cover plate 400 and the insertion portion 112, and the lower plastic is pressed tightly between the cover plate 400 and the insertion portion, thereby ensuring the stability of the connection of the negative electrode column 100 and avoiding the risk of short circuit of the negative electrode column 100 due to contact with the cover plate 400 through the upper plastic 330 and the lower plastic 340.

[0037] In one embodiment, continue to refer to Figure 2 As shown, the cover plate 400 is further provided with a first limiting groove 403 on a side close to the upper plastic 330 and located on the outer periphery of the negative pole mounting hole 401 , and the first limiting groove 403 is used to accommodate the upper plastic 330 .

[0038] In one embodiment, the cover plate 400 is provided with a first limiting groove 403 on one side close to the upper plastic 330 and around the negative pole mounting hole 401, and the upper plastic 330 is accommodated in the first limiting groove 403. In this way, the upper plastic 330 can be easily assembled and positioned through the first limiting groove 403, and the overall height of the cover plate 400 can be further reduced.

[0039] In one embodiment, the upper plastic 330 is provided with a third limiting groove 332 around the first through hole 331 on a surface away from the cover plate 400, and the third limiting groove is communicated with the first through hole 331, and the welding ring 310 is installed in the third limiting groove 332. In this way, by setting the third limiting groove 332, it is possible to facilitate the assembly and positioning of the welding ring 310, and it also has the technical effect of reducing the overall height of the cover plate 400.

[0040] In one embodiment, continue to refer to Figure 4 As shown, the cover plate 400 is further provided with a second limiting groove 404 on the side away from the upper plastic 330 and located on the outer periphery of the negative electrode column mounting hole 402, and the sealing ring 320 is clamped between the second limiting groove 404 and the limiting portion 111. Similarly, in this embodiment, the second limiting groove 404 can facilitate the assembly and positioning of the sealing ring 302, and has the technical effect of reducing the overall height of the cover plate 400.

[0041] In one embodiment, see Figure 1 and Figure 2 As shown, the positive electrode column 200 and the negative electrode column 100 are respectively installed on opposite sides of the cover plate 400, and the cover plate 400 is also equipped with an explosion-proof hole 405 and a liquid injection hole 406 between the positive electrode column 200 and the negative electrode column 100; wherein, an explosion-proof plate 500 is installed on the explosion-proof hole 405, and the liquid injection hole 406 is used for welding aluminum nails or aluminum sheets after liquid injection.

[0042] The battery top cover adopts a copper-aluminum composite electrode for the negative electrode 100, which saves the use of copper materials and reduces the assembly cost under the premise of meeting the electrode assembly requirements; in addition, the welding ring 310 is sleeved and welded to the outside of the copper part 110 of the negative electrode 100, and the composite interface of the copper part 110 and the aluminum part 120 and the aluminum part 120 are both located on the side of the welding ring 310 away from the cover plate, and the sealing ring 320 is always pressed between the copper part 110 and the cover plate 400, so that the elastic force of the sealing ring 320 acts on the welding point between the welding ring 310 and the copper part 110 and on the welding ring 310, and does not affect the composite interface of the copper part 110 and the aluminum part 120, thereby avoiding the risk of the copper part 110 and the aluminum part 120 of the negative electrode 100 falling off, thereby improving the safety performance of the product.

[0043] In a second aspect, the present application also provides a battery structure.

[0044] In one embodiment, a battery structure is provided, including a battery cell, a shell for accommodating the battery cell, and a top cover sealed and mounted on the top of the shell, wherein the top cover is the battery top cover described in any of the above embodiments. Specifically, the shell is formed with a storage space for accommodating the battery cell, the top of the shell is provided with an opening, and the top cover is sealed and mounted on the opening on the top of the shell after the battery cell is accommodated in the storage space of the shell.

[0045] In one embodiment, the battery structure further includes a connecting piece, and the tabs of the battery cell accommodated in the shell are connected to the connecting piece, and the connecting piece is also welded to the negative electrode column or the positive electrode column.

[0046] The battery top cover and battery structure adopt a copper-aluminum composite electrode for the negative electrode, which saves the use of copper materials and reduces component costs while meeting the electrode assembly requirements. In addition, the welding ring is sleeved and welded to the outside of the copper part of the negative electrode, and the composite interface of the copper part and the aluminum part and the aluminum part are both located on the side of the welding ring away from the cover plate, and the sealing ring is always pressed tightly between the copper part and the cover plate, so that the elastic force of the sealing ring acts on the welding point between the welding ring and the copper part and on the welding ring, and does not affect the composite interface of the copper part and the aluminum part, thereby avoiding the risk of the copper part and the aluminum part of the negative electrode falling off, and improving the safety performance of the product.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery top cover, characterized in that: include: A negative pole, a mounting assembly and a cover plate, wherein the cover plate is provided with a negative pole mounting hole, and the negative pole is mounted in the negative pole mounting hole through the mounting assembly; the negative pole is a copper-aluminum composite pole, comprising a copper portion and an aluminum portion; the mounting assembly comprises a welding ring and a sealing ring, the welding ring is sleeved and welded outside the copper portion of the negative pole to mount the negative pole in the negative pole mounting hole, the composite interface between the copper portion and the aluminum portion of the negative pole and the aluminum portion are both located on the side of the welding ring away from the cover plate; the sealing ring is sleeved outside the negative pole and is pressed tightly between the copper portion of the negative pole and the cover plate.

2. The battery top cover according to claim 1, characterized in that: The copper part of the negative electrode column comprises a limit part and an insertion part which are connected to each other. The sealing ring is sleeved outside the insertion part and is pressed tightly between the limit part and the cover plate.

3. The battery top cover according to claim 2, characterized in that: The width of the inserting portion of the copper portion is greater than the width of the aluminum portion, and the width of the inserting portion is less than the width of the limiting portion.

4. The battery top cover according to claim 1, characterized in that: The thickness of the aluminum portion of the negative electrode column is greater than 1 mm, and the thickness of the copper portion is greater than 1 mm, and the thickness of the copper portion is greater than the thickness of the aluminum portion.

5. The battery top cover according to claim 2, characterized in that: The inserting portion of the copper portion has a stamping forming mechanism, and a stamping groove is formed on a side of the limiting portion away from the inserting portion.

6. The battery top cover according to claim 2, characterized in that: The mounting assembly further includes an upper plastic and a lower plastic, the upper plastic being provided with a first through hole, the first through hole of the upper plastic being sleeved outside the insertion portion, and the upper plastic being pressed tightly between the welding ring and the cover plate; the lower plastic being provided with a second through hole, the second through hole of the lower plastic being sleeved outside the insertion portion, and the lower plastic being pressed tightly between the limiting portion and the cover plate.

7. The battery top cover according to claim 6, characterized in that: The cover plate is also provided with a first limiting groove on one side close to the upper plastic and located on the outer periphery of the negative pole mounting hole, and the first limiting groove is used to accommodate the upper plastic.

8. The battery top cover according to claim 6, characterized in that: The cover plate is further provided with a second limiting groove on a side away from the upper plastic and located at the outer periphery of the negative pole mounting hole, and the sealing ring is clamped between the second limiting groove and the limiting portion.

9. The battery top cover according to claim 6, characterized in that: The upper plastic is provided with a third limiting groove on one side close to the welding ring, and the third limiting groove is used for the welding ring to be clamped.

10. A battery structure, characterized in that: It comprises a battery cell, a shell for accommodating the battery cell, and a top cover sealed and installed on the top of the shell, wherein the top cover is the battery top cover according to any one of claims 1 to 9.

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