Secondary battery and case assembly thereof

Abstract

The utility model discloses a secondary battery and a shell assembly thereof. The shell assembly comprises a shell and a pole assembly, the shell comprises an end wall and a plurality of side walls surrounding the end wall, and a first through hole is formed in the first side wall; the pole assembly comprises a pole, a first insulating part and a second insulating part, and both the second insulating part and the first insulating part are provided with through holes; the pole is provided with a penetrating body which is arranged in the penetrating hole and the first through hole in a penetrating manner and is isolated from the first through hole in an insulating manner, and an outward convex structure which protrudes out of the penetrating body from the two tail ends of the penetrating body from the side direction, and the outward convex structure enables the first insulating part and the second insulating part to clamp the first side wall; convex ring structures are arranged on the first side surface and / or the second side surface, the convex ring structure on the first side surface is extruded with the inner side surface of the first side wall, and the convex ring structure on the second side surface is extruded with the corresponding convex structure; therefore, the first insulating part is better pre-pressed with the pole and / or the first side wall when the pole is riveted, a circle of reliable sealing effect is formed, and the sealing effect is improved.

Description

Technical Field

[0001] This utility model relates to a battery used in the field of new energy, and more particularly to a secondary battery and its casing assembly used in the field of new energy. Background Technology

[0002] As is well known, lithium-ion batteries are a type of secondary battery (rechargeable battery or storage battery) that can be widely used in the new energy field. With significant improvements in energy density, cycle life and safety, they are becoming increasingly popular in the new energy field.

[0003] Currently, for lithium-ion battery slabs using fully sealed laser welding, the structure includes a casing, terminal assembly, and sealing pins. The terminal assembly primarily consists of the terminal and an insulating component. Because this insulating component has a ring-shaped, sheet-like structure, after the terminal is riveted, it fails to effectively perform its sealing function, leading to a risk of battery leakage.

[0004] Furthermore, because the insulating component has a ring-shaped sheet structure, after the tabs of the electrode core are welded to the terminal post, there is a risk that the tabs welded to the terminal post may come into contact with the outer casing, which could lead to a short circuit in the battery.

[0005] Therefore, there is an urgent need for a secondary battery and its casing assembly to overcome the above-mentioned defects. Utility Model Content

[0006] One objective of this invention is to provide a casing assembly for a secondary battery, so that the first insulating member can be better pre-pressed with the terminal post during terminal post riveting to form a reliable sealing effect, thereby improving the sealing effect.

[0007] Another objective of this invention is to provide a secondary battery in which the first insulating component is better pre-pressed with the electrode post during post riveting to form a reliable sealing effect, thereby improving the sealing effect.

[0008] To achieve the above objectives, the secondary battery casing assembly of this utility model includes a casing and an electrode assembly. The casing includes an end wall and a plurality of side walls surrounding the end wall, and a first through hole is formed on a first side wall among the plurality of side walls. The electrode assembly includes an electrode, a first insulating member facing the inner side of the first sidewall, and a second insulating member facing the outer side of the first sidewall. Both the second insulating member and the first insulating member have through holes. The electrode has a through body that passes through the through hole and the first through hole and is insulated from the first through hole, and an outward protrusion structure that protrudes laterally from the through body from both ends of the through body. The outward protrusion structure clamps the first insulating member and the second insulating member to the first sidewall. The first insulating member has a first side facing the first sidewall and a second side facing away from the first sidewall. The first side and / or the second side are provided with a convex ring structure arranged around the center line of the through hole of the first insulating member. The convex ring structure is staggered outward relative to the through hole. The convex ring structure on the first side is pressed against the inner side of the first sidewall, and the convex ring structure on the second side is pressed against the corresponding outward protrusion structure.

[0009] Compared with the prior art, by means of the convex ring structure arranged outwardly from the center line of the perforation of the first insulating member provided on the first side and / or the second side, the first insulating member is better pre-pressed with the pole and / or the first side wall during pole riveting, forming a reliable sealing effect, thereby improving the sealing effect.

[0010] Preferably, the first side has an outwardly protruding ring that passes through the first through hole and is partially embedded in the perforation of the second insulating member, and the perforation of the first insulating member also penetrates the outwardly protruding ring.

[0011] Preferably, the end of the first insulating member adjacent to the end wall is bent and extends into a barrier arranged parallel to the end wall.

[0012] Preferably, the barrier is a flat, blocky structure.

[0013] Preferably, the first side and the second side are parallel to each other and are planar.

[0014] Preferably, the pole assembly further includes a metal washer that is sleeved on the insert body and sandwiched between the second insulating member and the protruding structure opposite to the second insulating member.

[0015] Preferably, the housing assembly of this utility model further includes a sealing pin, and the second sidewall of the plurality of sidewalls has a second through hole, and the sealing pin is assembled and connected to the second sidewall to seal the second through hole.

[0016] Preferably, the first sidewall and the second sidewall are arranged to intersect, the first through hole is adjacent to the second sidewall, and the second through hole is adjacent to the first sidewall.

[0017] Preferably, the end wall has a flat structure.

[0018] To achieve the above objectives, the secondary battery of this invention includes the aforementioned outer casing assembly and an electrode core with a first tab and a second tab. The first tab is electrically connected to the terminal post, and the second tab is electrically connected to the outer casing.

[0019] Compared with the prior art, by means of the convex ring structure arranged outwardly from the center line of the perforation of the first insulating member provided on the first side and / or the second side, the first insulating member is better pre-pressed with the pole and / or the first side wall during pole riveting, forming a reliable sealing effect, thereby improving the sealing effect. Attached Figure Description

[0020] Figure 1 This is a perspective view of the secondary battery of this utility model.

[0021] Figure 2 yes Figure 1 The diagram shows a secondary battery viewed in the direction indicated by the arrow next to it.

[0022] Figure 3 It is along Figure 2 Internal view of the section cut along line AA.

[0023] Figure 4 yes Figure 3 Enlarged view of section C.

[0024] Figure 5 It is along Figure 2 Internal view of the section cut along the BB line.

[0025] Figure 6 yes Figure 1 The diagram shown is an exploded 3D view of a secondary battery.

[0026] Figure 7 yes Figure 6 A further exploded 3D diagram.

[0027] Figure 8 yes Figure 6 A 3D view showing the concealed cover plate and sealing pins.

[0028] Figure 9 yes Figure 8 A 3D view of the hidden electrode core.

[0029] Figure 10 yes Figure 9 A three-dimensional exploded view.

[0030] Figure 11 This is a perspective view of the first insulating component of the outer casing assembly in the secondary battery of this utility model.

[0031] Figure 12 yes Figure 11 The first insulating element is shown in a plan view from top to bottom.

[0032] Figure 13 It is along Figure 12 Internal view of the section cut along the DD line.

[0033] Figure 14 Yes Figure 1 The image shows a three-dimensional view of a deformed secondary battery. Detailed Implementation

[0034] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0035] Please see Figure 1 , Figure 3 , Figure 6 and Figure 7 The secondary battery 1000 of this utility model includes a housing assembly 100 (see...). Figure 7 The device includes an electrode core 200 with a first tab 210 and a second tab 220. The first tab 210 is electrically connected to the electrode post 21 described below, and the second tab 220 is electrically connected to the outer casing 10 (specifically, the first sidewall 12) described below. Optionally, in... Figure 3 and Figure 7 In this example, the electrode core 200 can be a stacked electrode core; obviously, depending on actual needs, the electrode core 200 can also be a wound electrode core, so this is not used as an example. Figure 3 and Figure 7 The limitation is that it is limited.

[0036] Combined Figures 8 to 13 As an example, the housing assembly 100 includes a housing 10 and a pole assembly 20. The housing 10 includes an end wall 11 and four side walls surrounding the end wall 11. For ease of description, the four side walls are respectively named the first side wall 12, the second side wall 13, the third side wall 14, and the fourth side wall 15, so that the housing 10 formed by the end wall 11 and the first to fourth side walls 15 is square. Since the number of side walls is determined by the shape of the end wall 11, the number of side walls is not determined by... Figures 1 to 2 and Figures 6 to 10 As shown is for limitation. Additionally, a first through hole 121 is provided on the first sidewall 12; optionally, it is located at... Figure 10In this example, the first through hole 121 is a circular hole to facilitate its fabrication on the first sidewall 12; obviously, depending on actual needs, the first through hole 121 can also be other shapes well known in the art, therefore it is not considered... Figure 10 The above is the limit.

[0037] And combined Figure 4 As an example, the pole assembly 20 includes a pole 21, a first insulating member 22 facing the inner side 122 of the first sidewall 12, and a second insulating member 23 facing the outer side 123 of the first sidewall 12. The second insulating member 23 has a through hole 231, and the first insulating member 22 has a through hole 221. Optionally, as an example, the through holes 221 (231) are all circular holes to facilitate the fabrication of the through holes 221 (231). Obviously, depending on actual needs, the through holes 221 (231) can also be other shapes known in the art. Additionally, the pole post 21 has a through-hole 221 (231) that passes through the through hole 221 (231) and the first through hole 121 and is insulated from the first through hole 121, and an outwardly protruding structure 212 (213) that protrudes laterally from the two ends of the through-hole 211. The outwardly protruding structure 212 (213) clamps the first insulating member 22 and the second insulating member 23 to the first sidewall 12. Furthermore, it is combined with Figure 4 , Figure 12 and Figure 13 As an example, the first insulating member 22 has a first side surface 222 and a second side surface 223. The first side surface 222 faces the first side wall 12, and the second side surface 223 faces away from the first side wall 12. Each of the first and second side surfaces 222 and 223 has a convex ring structure 224 arranged around the center line L of the through hole 221 of the first insulating member 22. The convex ring structure 224 is offset outward relative to the through hole 221. The convex ring structure 224 on the first side surface 222 is pressed against the inner side surface 122 of the first side wall 12, and the convex ring structure 224 on the second side surface 223 is pressed against the corresponding outer convex structure 213. With the help of the convex ring structure 224, the first insulating member 22 can be better pre-pressed against the electrode 21 and the first side wall 12 respectively during the riveting of the electrode post 21, forming a reliable sealing effect, thereby improving the sealing effect of the secondary battery 1000 of this utility model. Specifically, in Figure 4 and Figure 13 In this example, the first side 222 and the second side 223 are parallel to each other and are planar to ensure that the thickness of the first insulating member 22 is uniform. Obviously, depending on actual needs, the relationship and shape between the first side 222 and the second side 223 can also be other relationships and shapes well known in the art, so they are not specified. Figure 4 and Figure 13 The image shown is for illustrative purposes only. It should be noted that, depending on actual needs, a protruding ring structure 224 may be provided on either the first side 222 or the second side 223; therefore, it is not limited to the image shown. Figure 4 , Figure 12 and Figure 13 The above is a limited description. More specifically, as follows:

[0038] like Figures 1 to 4 and Figures 6 to 10 As shown, as an example, the pole assembly 20 also includes a metal washer 24, which is sleeved on the insert 211. The metal washer 24 is also sandwiched between the second insulator 23 and the protruding structure 212 opposite to the second insulator 23. Therefore, during the process of forming the aforementioned protruding structure 212 after the end of the pole 21 is riveted, the metal washer 24 bears the riveting thrust of the pole 21 on the second insulator 23, preventing the second insulator 23 from being damaged, thereby improving the insulation and sealing performance of the second insulator 23. Alternatively, in Figure 4 In this example, the outer diameter of the metal washer 24 is larger than the outer diameter of the convex structure 212 and smaller than the outer diameter of the second insulating member 23, but not... Figure 4 The above is for illustrative purposes only; additionally, the metal washer 24 and the pole post 21 may be made of metal materials, for example, the metal washer 24 is preferably made of stainless steel or other alloy materials, and the pole post 21 is preferably made of aluminum or other metal materials; furthermore, the first insulating element 22 and the second insulating element 23 may be made of plastic or composite materials, preferably PP, PPS or other corrosion-resistant plastic materials.

[0039] For example Figure 4 As shown in the figure, as an example, the first side surface 222 is provided with an outwardly protruding ring 225 that passes through the first through hole 121 and is partially embedded in the through hole 231 of the second insulating member 23. At this time, the through hole 221 of the first insulating member 22 also passes through the outwardly protruding ring 225, so as to achieve insulation separation between the pole post 21 and the first side wall 12 by means of the outwardly protruding ring 225. Since the outwardly protruding ring 225 is partially embedded in the through hole 231 of the second insulating member 23, it prevents the outwardly protruding ring 225 from approaching the metal. The direction of the washer 24 protrudes from the second insulator 23, and will not interfere with the metal washer 24 used to press against the second insulator 23, thereby ensuring the reliability of the metal washer 24 pressing against the second insulator 23; and since the outer convex ring 225 is partially embedded in the through hole 231 of the second insulator 23, it can provide assembly positioning for the second insulator 23 during the process of forming the outer convex structure 212 after the end of the pole post 21 is riveted, thereby facilitating the assembly operation of the second insulator 23.

[0040] Combination Figure 4 and Figures 8 to 13As shown, as an example, the end of the first insulating member 22 adjacent to the end wall 11 is bent and extends into a barrier 226 arranged parallel to the end wall 11. This barrier 226, by virtue of its position, better protects the polarity insulation when the pole post 21 (specifically, the outwardly protruding structure 213) is welded to the first electrode tab 210, thus avoiding the risk of a short circuit due to contact between the first electrode tab 210 and the outer casing 10. Specifically, in Figure 11 In the middle, the barrier 226 is a flat block structure so that the barrier 226 can be closer to the end wall 11.

[0041] Combination Figure 4 and Figure 7 As an example, the housing assembly 100 also includes a sealing pin 30, and a second through hole 131 is provided on the second sidewall 13 to facilitate liquid injection into the housing assembly 100 by an operator. After liquid injection, the sealing pin 30 is assembled and connected to the second sidewall 13 to seal the second through hole 131. Specifically, as an example, the sealing pin 30 can be made of metal. In this case, the sealing pin 30 is welded to the second sidewall 13 to improve the reliability of the connection and seal between the sealing pin 30 and the second sidewall 13. Alternatively, the second through hole 131 can be a circular hole (see...). Figure 7 This facilitates the fabrication of the second through hole 131 on the second sidewall 13. Obviously, depending on actual needs, the second through hole 131 can also be other shapes well known in the art, therefore it is not considered... Figure 7 The above is the limit; in addition, at Figures 6 to 10 In this example, the first sidewall 12 and the second sidewall 13 are arranged intersectingly, the first through hole 121 is adjacent to the second sidewall 13, and the second through hole 131 is adjacent to the first sidewall 12, so that the pole post assembly 20 and the sealing pin 30 are arranged at the corner of the first sidewall 12 and the second sidewall 13. On the one hand, this more effectively avoids the opening of the first through hole 121 from affecting the strength of the first sidewall 12, and the opening of the second through hole 131 from affecting the strength of the second sidewall 13. On the other hand, it provides more sufficient space for the electrical connection between the second electrode tab 220 of the pole core 200 and the first sidewall 12.

[0042] like Figures 1 to 7 As shown, as an example, the housing 10 also includes a cover plate 17 for covering the receiving cavity 16 enclosed by the end wall 11 and all the side walls. The cover plate 17 is also sealed and welded to all the side walls to facilitate the assembly operation of the pole core 200 with the housing 10. Alternatively, the housing 10 may be made of metal, preferably stainless steel or other alloy materials, and steps may be provided on the cover plate 17 and all or part of the side walls to facilitate assembly positioning. In addition, the end wall 11 has a flat structure to facilitate the manufacture of the housing 10.

[0043] In summary, the assembly process of the secondary battery 1000 of this utility model is as follows: First, the electrode core 200 is installed inside the outer casing assembly 100, and the first electrode tab 210 of the electrode core 200 is welded to the electrode post 21, and the second electrode tab 220 of the electrode core 200 is welded to the first side wall 12; then, the cover plate 17 is covered and laser-welded to all side walls; then, electrolyte is injected through the second through hole 131; finally, the sealing nail 30 is used to cover the second through hole 131 and laser-welded to the second side wall 13.

[0044] Please see Figure 14 It is a Figure 1 The deformation of the secondary battery is shown. Figure 14 In the middle, because the end wall 11' of the outer shell 10' is irregularly shaped, correspondingly, it causes Figure 14 The secondary battery 1000' shown has an irregular shape, and the electrode core 200 is also irregularly shaped. Furthermore, because the end wall 11' is a hexagonal irregular shape, this results in an increase in the number of side walls of the outer casing 10'. Specifically, a fifth side wall 18 and a sixth side wall 19 are added between the second side wall 13 and the third side wall 14, as shown in the diagram. Figure 14 As shown.

[0045] And at Figure 1 In the case of the secondary battery 1000, since the end wall 11 of the outer casing 10 is square, correspondingly, this makes... Figure 1 The secondary battery 1000 shown is square; and since the end wall 11 is square, the corresponding number of side walls of the outer casing 10 is four.

[0046] Apart from the differences mentioned above, the two are the same, so they will not be repeated here.

[0047] Compared with the prior art, by means of the convex ring structure 224 arranged outwardly offset from the center line L of the hole 221 of the first insulating member 22 provided on the first side 222 and / or the second side 223, the first insulating member 22 is better pre-pressed with the pole post 21 and / or the first side wall 12 when the pole post 21 is riveted, forming a reliable sealing effect, thereby improving the sealing effect.

[0048] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A casing assembly for a secondary battery, comprising a casing and an electrode assembly, the casing comprising an end wall and a plurality of side walls surrounding the end wall, a first side wall having a first through hole, the electrode assembly comprising an electrode, a first insulating member facing the inner side of the first side wall and a second insulating member facing the outer side of the first side wall, both the second insulating member and the first insulating member having through holes, the electrode having a through body inserted into the through hole and the first through hole and insulated from the first through hole, and an outwardly protruding structure extending laterally outward from the through body at both ends of the through body, the outwardly protruding structure causing the first insulating member and the second insulating member to clamp the first side wall, characterized in that... The first insulating member has a first side facing the first sidewall and a second side facing away from the first sidewall. The first side and / or the second side are provided with a convex ring structure arranged around the center line of a hole in the first insulating member. The convex ring structure is arranged outwardly offset from the hole. The convex ring structure on the first side is squeezed against the inner side of the first sidewall, and the convex ring structure on the second side is squeezed against the corresponding outer convex structure.

2. The housing assembly according to claim 1, characterized in that, The first side has an outwardly protruding ring that passes through the first through hole and is partially embedded in the perforation of the second insulating member, and the perforation of the first insulating member also penetrates the outwardly protruding ring.

3. The housing assembly according to claim 1, characterized in that, The first insulating member extends from the end adjacent to the end wall by bending, forming a barrier arranged parallel to the end wall.

4. The housing assembly according to claim 3, characterized in that, The barrier is a flat, block-shaped structure.

5. The housing assembly according to claim 1, characterized in that, The first side and the second side are parallel to each other and are planar.

6. The housing assembly according to claim 1, characterized in that, The pole assembly also includes a metal washer, which is sleeved on the insert body and sandwiched between the second insulating member and the protruding structure opposite to the second insulating member.

7. The housing assembly according to claim 1, characterized in that, It also includes a sealing pin, wherein the second sidewall of the plurality of sidewalls has a second through hole, and the sealing pin is assembled and connected to the second sidewall to seal the second through hole.

8. The housing assembly according to claim 7, characterized in that, The first sidewall and the second sidewall are arranged to intersect, the first through hole is adjacent to the second sidewall, and the second through hole is adjacent to the first sidewall.

9. The housing assembly according to claim 1, characterized in that, The end wall has a flat structure.

10. A secondary battery, comprising an electrode core with a first tab and a second tab, characterized in that, The secondary battery further includes a housing assembly according to any one of claims 1 to 9, wherein the first tab is electrically connected to the terminal post and the second tab is electrically connected to the housing.

Images