Electrical connecting sheet, top cover assembly and battery

Abstract

The utility model discloses a kind of electric connecting piece, top cover assembly and battery, electric connecting piece includes clamping part, connecting part and electric connecting part. Clamping part is used to be clamped into the inner chamber of hollow pole;Clamping part includes the top wall and side wall connected;Top wall is equipped with positioning clamping structure, positioning clamping structure is used to be clamped with hollow pole and be connected;Connecting part is connected with the end of side wall away from top wall;Electric connecting part is connected with connecting part, and electric connecting part is used to be welded with tab. Electric connecting piece sets clamping part, clamping part is positioned and clamped with hollow pole, clamping part is deeply into hollow pole, increase the contact area with pole, improve electric energy transmission efficiency, reduce electric energy loss. Positioning clamping structure is clamped with hollow pole to be positioned, avoid the position deviation of electric connecting piece and hollow pole when crimping, hollow pole crimping time crimping tool only press pole top wall upper surface, avoid the deformation of electric connecting part of electric connecting piece, make connection more stable.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to an electrical connector, a top cover assembly, and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in power batteries, energy storage batteries, and other technological fields. Power batteries provide power for tools, typically powering electric vehicles, electric trains, electric bicycles, golf carts, and other similar vehicles, and are core components of new energy vehicles. Energy storage batteries are commonly used in home energy storage, power stations for solar and wind power generation equipment, portable power supplies, communication base stations, and as batteries for storing renewable energy. The two types of batteries have different application scenarios, and their performance and design differ.

[0003] The aforementioned battery typically comprises multiple batteries, which are connected in series or parallel to form a battery module. The battery is the smallest unit constituting the battery module. The battery includes a housing for containing the electrolyte and the positive and negative electrode materials of the lithium battery, and a top cover assembly for sealing the opening of the housing. The top cover assembly includes a top cover sheet and a lower insulating sheet attached to the inner surface of the top cover sheet. Electrodes pass through the top cover sheet and the lower insulating sheet. One end of the electrode is located inside the battery for electrical connection with the tabs inside the battery, and the other end of the electrode is located outside the battery for parallel or series connection with other batteries.

[0004] The electrode includes a terminal post extending from the top cover assembly and an electrical connector plate connected to the end of the terminal post located inside the battery. The electrical connector plate is used to connect the terminal post and the tab, and is connected to the terminal post by welding. In the prior art, the electrical connector plate has a planar structure. During the welding process between the electrical connector plate and the terminal post, deformation may occur, and the flatness may not meet the requirements, which may lead to loose connection and poor contact. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects in the prior art and provide an electrical connector, a top cover assembly and a battery, by improving the structure of the electrical connector to prevent deformation of the electrical connector.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An electrical connector, comprising:

[0008] The engaging part is used to engage with the pole post; the engaging part includes a top wall and a side wall connected to each other; the top wall is provided with a positioning engaging structure, which is used to engage with the pole post.

[0009] A connecting portion, wherein the connecting portion is connected to the end of the side wall that is away from the top wall;

[0010] An electrical connection portion is connected to the connection portion, and the electrical connection portion is used to make an electrical connection with the electrode tab.

[0011] This utility model also discloses a top cover assembly, including the aforementioned electrical connecting piece.

[0012] This utility model also discloses a battery, including the aforementioned top cover assembly.

[0013] Implementing the embodiments of this utility model will have the following beneficial effects:

[0014] In this embodiment of the invention, the electrical connector is provided with a locking portion that engages with the electrode post. The locking portion extends deep into the electrode post, increasing the contact area and improving power transmission efficiency while reducing power loss. The locking structure engages with the electrode post for positioning, preventing positional deviation between the electrical connector and the electrode post during crimping. During electrode crimping, the crimping fixture only presses the upper surface of the top wall of the electrode post, preventing deformation of the electrical connector portion and ensuring a more stable connection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in:

[0017] Figure 1 This is a schematic diagram of the top cover assembly according to a specific embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A cross-sectional view along line A-A'.

[0019] Figure 3 yes Figure 1 A schematic diagram of a power connector.

[0020] Figure 4 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0021] Figure 5 yes Figure 1 Another schematic diagram of the electrical connector.

[0022] Figure 6 yes Figure 1 Another schematic diagram of the electrical connector.

[0023] Figure 7 yes Figure 1 A cross-sectional view along the B-B' direction.

[0024] 1-Electrical connecting piece, 11-Activating part, 111-Top wall, 112-Side wall, 113-Positioning and engaging structure, 114-Positioning protrusion, 12-Connecting part, 121-Receiving groove, 13-Electrical connecting part, 131-Hollowed area, 132-Fastening and engaging structure, 14-Bent connecting part, 2-Pole post, 3-Sealing element, 4-Lower insulating element, 41-Fastening and engaging buckle, 5-Top cover piece, 6-Conductive element, 7-Upper insulating element, 100-Top cover assembly. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] refer to Figures 1-3 The present invention discloses an electrical connector 1 including a locking part 11, a connecting part 12 and an electrical connecting part 13.

[0027] The engaging part 11 is used to engage with the pole post 2; the engaging part 11 includes a top wall 111 and a side wall 112 connected to each other; the top wall 111 is provided with a positioning engaging structure 113, which is used to engage with the pole post 2.

[0028] The connecting part 12 is connected to the end of the side wall 112 that is away from the top wall 111.

[0029] Electrical connection part 13 is connected to connection part 12, and electrical connection part 13 is used to make electrical connection with electrode tab.

[0030] Understandably, the electrical connector 1 is provided with a locking part 11, which engages with the electrode post 2 for positioning. The locking part 11 extends deep into the electrode post 2, increasing the contact area with the electrode post 2, improving power transmission efficiency, and reducing power loss. The positioning locking structure 113 engages with the electrode post 2 for positioning, preventing positional deviation between the electrical connector 1 and the electrode post 2 during crimping. When the electrode post 2 is crimped, the crimping tool only presses the upper surface of the top wall 111 of the electrode post 2, preventing deformation of the electrical connector part 13 of the electrical connector 1, and making the connection more stable.

[0031] In one specific embodiment, the pole 2 is a hollow pole, including a hollow column body and an end located at one end of the hollow column body. The hollow column body has an inner cavity, and the top wall 111 and the side wall 112 respectively abut against the inner cavity surface of the hollow pole body, so that the engaging part 11 engages with the inner cavity of the hollow pole body.

[0032] In some alternative embodiments, reference is made to Figure 2 , Figure 3 The positioning and engaging structure 113 is a groove. The positioning and engaging structure 113 is located at the center of the top wall 111. The pole post 2 is provided with an engaging protrusion that engages into the groove.

[0033] Furthermore, the groove is formed by the top wall 111 being recessed in a direction away from the pole post 2. By forming the groove by the top wall 111 being recessed in a direction away from the pole post 2, there is no need to weld parts separately, reducing assembly steps.

[0034] In another specific embodiment, the positioning and engaging structure 113 can also be a protrusion (not shown in the figure), in which case the pole post 2 is provided with an engaging groove, and the protrusion engages into the engaging groove of the pole post 2.

[0035] In some alternative embodiments, reference is made to Figure 4 On the side surface of the top wall 111 opposite to the pole post 2, there is also a positioning protrusion 114 protruding from the pole post 2. The positioning protrusion 114 is used to engage with the crimping tool to position the connecting piece and avoid crimping position deviation.

[0036] In some alternative embodiments, reference is made to Figure 5 The positioning protrusion 114 electrical connection piece 1 also includes a bent connection part 12, the two ends of which are connected to the connection part 12 and the electrical connection part 13 respectively, and the bent connection part 12 is located on the end side of the pole post 2.

[0037] It is understandable that by setting the bent connection part 14, the electrical connection part 13 of the electrical connection piece 1 is brought closer to the lower insulating member 4, saving internal space of the cell, providing more space for the electrolyte, and improving the volumetric energy density and gravimetric energy density of the battery.

[0038] In some alternative embodiments, reference is made to Figure 6 The connecting part 12 is provided with a receiving groove 121, which is used to receive the end of the pole post 2.

[0039] It is understandable that by setting the receiving groove 121, the end of the electrode post 2 is accommodated in the receiving groove 121. Then, relative to the receiving groove 121, the electrical connection part 13 of the electrical connection piece 1 is closer to the lower insulating member 4, saving internal space of the cell, providing more space for electrolyte, and improving the volumetric energy density and gravimetric energy density of the battery.

[0040] In some alternative embodiments, reference continues to be made to... Figure 5 The thickness of the electrical connection portion 13 is less than or equal to the thickness of the connection portion 12.

[0041] Preferably, the thickness of the electrical connection portion 13 is less than the thickness of the connection portion 12, and there is a thickness transition from the connection portion 12 to the electrical connection portion 13, which facilitates welding, saves internal space of the battery, and increases the capacity of a single battery cell.

[0042] In some optional embodiments, after the connecting piece is stamped, an electrical connection portion 13 is formed. The electrical connection portion 13 intersects with the connecting portion 12. The pole post 2 is connected to the connecting piece by welding. During welding, the area of ​​the sealing element 3 is avoided, and the welding heat will not affect the sealing element 3. After welding, the electrode tab is welded to the electrical connection portion 13. The electrode tab can be welded to the side of the electrical connection portion 13 close to the pole post 2 or to the side of the electrical connection portion 13 away from the pole post 2. After the electrode tab is welded, it is folded and flattened so that the electrical connection portion 13 is flat with the connecting portion 12, thereby reducing the space occupied by the electrical connection portion 13.

[0043] Furthermore, referring to Figure 6 , Figure 7 The electrical connection portion 13 has a fastening engagement structure 132 on the side near the terminal post 2. The fastening engagement structure 132 is used to engage with the lower insulating member 4, restricting the lateral and longitudinal displacement of the electrical connection portion relative to the lower insulating member. In this embodiment, the fastening engagement structure 132 protrudes from the lower insulating member 4, and the lower insulating member 4 has a fastening buckle 41. The fastening engagement structure 132 engages with the fastening buckle 41. The width of the fastening buckle 41 on the side near the electrical connection portion 13 is smaller than the width on the side away from the electrical connection portion 13, to prevent the fastening engagement structure 132 from falling out of the fastening buckle 41. After the electrical connection portion 13 of the connecting piece is flattened, it is locked in the fastening buckle 41 of the lower insulating member 4, preventing the connecting piece from jumping after being flattened and preventing it from affecting the battery overcurrent during battery operation. In other embodiments, the fastening engagement structure 132 can also be a groove structure.

[0044] In another specific embodiment, when the connecting piece is stamped and the electrical connection part 13 and the connecting part 12 are on the same plane, the electrode tab is first welded to the electrical connection part 13. After the electrode tab is welded, the connecting part 12 is then welded to the hollow electrode post.

[0045] Furthermore, referring to Figure 6 The electrical connection part 13 is also provided with a hollow area 131, and the electrode tab (not shown in the figure) passes through the hollow area 131 and connects to the side of the electrical connection part 13 near the electrode post 2.

[0046] It should be noted that the tab can be welded to the side of the electrical connection portion 13 near the terminal post 2 or to the side of the electrical connection portion 13 away from the terminal post 2. When the tab is welded to the side of the electrical connection portion 13 away from the terminal post 2, the electrical connection portion 13 can be directly folded flat, and there is a gap between the electrical connection portion 13 and the lower insulating member 4 that avoids the thickness of the tab, so it will not affect the battery overcurrent.

[0047] When the tab passes through the hollow area 131 of the electrical connection part 13, the tab is welded to the side of the electrical connection part 13 near the pole post 2. The gap between the electrical connection part 13 and the lower insulating member 4 can accommodate the tab, avoiding interference and not affecting the overcurrent. At the same time, the heat of the connecting piece during welding will not affect the lower insulating member 4.

[0048] This utility model also discloses a top cover assembly 100, including a pole post 2 and an electrical connection piece 1 in any of the above embodiments.

[0049] It is understandable that this embodiment uses hollow terminals. The hollow structure reduces the weight of the terminals 2, lightens the overall battery weight, and achieves weight reduction. The space saved by the hollow terminals can accommodate more active materials, indirectly increasing the energy density of the battery. The electrical connector 1 is provided with a locking part 11, which engages with the hollow terminal. The locking part 11 extends deep into the hollow terminal, increasing the contact area with the hollow terminal, improving power transmission efficiency, and reducing power loss. The positioning locking structure 113 engages with the hollow terminal to position it, avoiding positional deviation between the electrical connector 1 and the hollow terminal during pressing. When pressing the hollow terminal, the pressing tool only presses the upper surface of the top wall 111 of the hollow terminal, preventing deformation of the electrical connector part 13 of the electrical connector 1, making the connection more stable.

[0050] Furthermore, the top cover assembly 100 also includes: a seal 3, a lower insulator 4, a top cover sheet 5, a conductive element 6, and an upper insulator 7.

[0051] The sealing element 3 is sleeved on the outside of the hollow pole; the inner surface of the top cover plate 5 abuts against the lower insulating element 4, the hollow pole passes through the lower insulating element 4 and the top cover plate 5, and the sealing element 3 is located between the top cover plate 5 and the hollow pole; the conductive element 6 is disposed on the outside of the top cover plate 5 and is sleeved on the hollow pole; the upper insulating element 7 is disposed between the conductive element 6 and the top cover plate 5; the electrical connecting piece 1 is located on the side of the lower insulating element 4 away from the top cover plate 5.

[0052] This utility model also discloses a battery, including the top cover assembly 100 in any of the above embodiments.

[0053] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrical connector, characterized in that, include: The engaging part is used to engage with the pole post; the engaging part includes a top wall and a side wall connected to each other; the top wall is provided with a positioning engaging structure, which is used to engage with the pole post. A connecting portion, wherein the connecting portion is connected to the end of the side wall that is away from the top wall; An electrical connection portion is connected to the connection portion, and the electrical connection portion is used to make an electrical connection with the electrode tab.

2. The electrical connector according to claim 1, characterized in that, The positioning and engaging structure is a protrusion or a groove, and the positioning and engaging structure is located at the center of the top wall.

3. The electrical connector according to claim 2, characterized in that, The groove is formed by the top wall being recessed in a direction away from the pole post.

4. The electrical connector according to claim 3, characterized in that, The top wall surface facing away from the pole post is also provided with a positioning protrusion that protrudes away from the pole post.

5. The electrical connector according to claim 1, characterized in that, The top wall and the side wall respectively abut against the inner surface of the pole post.

6. The electrical connector according to any one of claims 1 to 5, characterized in that, It also includes a bent connection portion, the two ends of which are respectively connected to the connection portion and the electrical connection portion, and the bent connection portion is located on the end side of the pole post; Alternatively, the connecting part may be provided with a receiving groove for accommodating the end of the pole post.

7. The electrical connector according to claim 1, characterized in that, The thickness of the electrical connection is less than or equal to the thickness of the connection portion.

8. The electrical connector according to claim 1, characterized in that, The electrical connection part is also provided with a hollow area, and the electrode tab passes through the hollow area and connects to the side of the electrical connection part near the electrode post; The electrical connection portion is provided with a fastening engagement structure on the side near the pole post, and the fastening engagement structure is used to engage with the lower insulating component.

9. A top cover assembly, characterized in that, It includes the electrode post and the electrical connector as described in any one of claims 1 to 8.

10. A battery, characterized in that, Includes the top cover assembly as described in claim 9.

Images