Lithium ion battery
By designing the tabs in lithium-ion batteries without bending them, and combining the structure of connecting pieces, tapes, and separators, the short-circuit problem caused by inserting the tabs inside is solved, improving the battery's energy density and safety.
Patent Information
- Application Number
- CN202520214887.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing solutions for reducing the size of lithium battery components can easily lead to the insertion of tabs into the battery, causing short circuits and safety accidents, and affecting battery performance.
The design avoids bending the electrode tabs during the sealing process. Instead, one end of the connecting piece connects to the electrode tab of the battery cell, while the other end is bent to connect to the cover plate, thus avoiding the insertion of the electrode tabs inside the cell. Combined with the tape and separator structure, the assembly is optimized, increasing the space for the electrode plates.
This avoids short circuits caused by inserting the tabs internally, increases battery energy density, increases the space for electrode plates, and improves battery safety and performance.
Smart Images
Figure CN223828671U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of batteries, and more particularly to a lithium-ion battery. Background Technology
[0002] With the rapid development of mobile devices, electric vehicles, and renewable energy storage systems, the demand for high-performance lithium batteries is increasing daily. Energy density, as a key indicator of battery performance, directly affects the range and overall efficiency of devices. Therefore, the market is constantly striving to improve the energy density of lithium batteries to meet a wider range of application needs.
[0003] There are various methods to improve the energy density of lithium batteries, including but not limited to improving electrode materials, optimizing electrolyte formulations, and adopting novel separator technologies. Reducing the volume occupied by battery structural components is also an effective method. In existing technologies, reducing the space occupied by structural components may cause the tabs to bend and insert into the electrode core, which not only affects battery performance but may also cause internal short circuits, and in severe cases, even lead to battery damage or safety accidents. Utility Model Content
[0004] This invention provides a lithium-ion battery to solve the problem that existing solutions for reducing battery structural components are prone to causing safety accidents.
[0005] Specifically, this utility model provides a lithium-ion battery, including a casing, a cover plate, a battery cell, and a connecting piece; the casing has an opening, and the cover plate seals the opening; the battery cell is disposed inside the casing; the connecting piece is disposed between the cover plate and the battery cell; one end of the connecting piece is connected to the tab of the battery cell, and the other end is bent and connected to the cover plate.
[0006] Optionally, the connecting piece includes a first body and a second body connected to the first body. The first body is connected to the electrode tab of the battery cell, and the second body is connected to the cover plate. The projection of the first body on the cover plate and the projection of the second body on the cover plate at least partially overlap.
[0007] Optionally, the second body is located between the first body and the cover plate, and the first body and the second body are integrally bent into shape.
[0008] Optionally, the battery cell includes a battery cell body and positive electrode tabs and negative electrode tabs disposed at both ends of the battery cell body; the connecting piece includes a positive electrode connecting piece and a negative electrode connecting piece, the positive electrode connecting piece being connected to the positive electrode tab, and the negative electrode connecting piece being connected to the negative electrode tab.
[0009] Optionally, there are two openings, and the cover plates are configured to correspond one-to-one with the openings; the positive electrode connecting piece is connected to one of the cover plates, and the negative electrode connecting piece is connected to the other cover plate.
[0010] Optionally, the cover plate includes a cover plate body and an electrode block that penetrates and is embedded in the cover plate body, and the connecting piece is connected to the electrode block.
[0011] Optionally, the number of battery cells is one; or, the number of battery cells is multiple, with multiple battery cells connected in parallel and all connected to the connecting piece.
[0012] Optionally, the lithium-ion battery further includes an adhesive tape, which is attached to the tab, and one end of the connecting piece connected to the tab is located between the adhesive tape and the battery cell.
[0013] Optionally, the lithium-ion battery further includes a separator disposed between the cell and the casing; the separator includes a side plate and end plates disposed at both ends of the side plate, the side plate being disposed on one side of the cell and the end plates being disposed at the ends of the cell.
[0014] Optionally, the lithium-ion battery further includes a separator film, which is adhered to the side of the cell and extends to the side plate at both ends.
[0015] The beneficial effects of this utility model are as follows:
[0016] In the lithium-ion battery provided by this utility model, since it is not necessary to bend the tabs during the sealing process, short circuits caused by inserting the tabs can be avoided, thus preventing safety accidents. At the same time, this utility model reduces the height of the structural components (including the cover plate and connecting piece), increases the space for accommodating the electrode, and improves the battery energy density. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.
[0018] Figure 1 This is a schematic exploded view of a lithium-ion battery according to one embodiment of the present invention;
[0019] Figure 2 This is a schematic partial structural diagram of a lithium-ion battery in one embodiment of the present invention;
[0020] Figure 3This is a schematic partial structural diagram of a lithium-ion battery in one embodiment of the present invention;
[0021] Figure 4 This is a schematic partial structural diagram of a lithium-ion battery in one embodiment of the present invention;
[0022] Figure 5 This is a schematic structural diagram of a lithium-ion battery in one embodiment of the present invention.
[0023] In the diagram: 100, housing; 110, opening; 200, cover plate; 210, cover plate body; 220, pole piece; 300, battery cell; 310, battery cell body; 320, tab; 400, connecting piece; 500, tape; 600, partition; 610, side plate; 620, end plate; 700, insulating film. Detailed Implementation
[0024] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0025] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Figure 1 This is a schematic exploded view of a lithium-ion battery according to one embodiment of the present invention, as shown below. Figure 1 As shown, and with reference Figures 2 to 5This utility model provides a lithium-ion battery, including a housing 100, a cover plate 200, a battery cell 300, and a connecting piece 400; the housing 100 has an opening 110, and the cover plate 200 covers the opening 110; the battery cell 300 is disposed inside the housing 100; the connecting piece 400 is disposed between the cover plate 200 and the battery cell 300; one end of the connecting piece 400 is connected to the tab 320 of the battery cell 300, and the other end is bent and connected to the cover plate 200.
[0028] In application, the battery cell 300 is first installed into the housing 100. Then, the two ends of the connecting piece 400 are welded to the tabs 320 of the battery cell 300 and the cover plate 200, respectively. At this time, there is an angle between the cover plate 200 and the opening 110. Then, the cover plate 200 is flipped over, and the connecting piece 400 is bent to seal the cover plate 200 over the opening 110. Finally, the cover plate 200 is welded to the housing 100. Figure 4 As shown, when the connecting piece 400 is welded to the cover plate 200, there is a large angle between the cover plate 200 and the plane containing the opening 110. Therefore, in order for the cover plate 200 to cover the opening 110, the connecting piece 400 needs to be bent. If the connecting piece 400 is bent and fits tightly against the cover plate 200, a certain gap can be left between the battery cell 300 and the cover plate 200 to improve assembly efficiency.
[0029] Since this embodiment of the invention does not require bending the tabs 320 in the cover plate 200 section, it can avoid short circuits caused by inserting the tabs 320 into the battery and prevent safety accidents. At the same time, this invention reduces the height of the structural components (including the cover plate 200 and the connecting piece 400), increases the space for accommodating the electrode, and improves the battery energy density.
[0030] In one embodiment of this utility model, the connecting piece 400 includes a first body and a second body connected to the first body. The first body is connected to the tab 320 of the battery cell 300, and the second body is connected to the cover plate 200. The projection of the first body on the cover plate 200 and the projection of the second body on the cover plate 200 at least partially overlap. Further, the second body is located between the first body and the cover plate 200, and the first body and the second body are integrally bent. In application, the first body of the connecting piece is welded to the tab 320 of the battery cell 300, a portion of the first body is parallel to the end face of the battery cell 300, and the remaining portion of the first body is on the same plane as the second body. When the cover plate 200 is flipped and the connecting piece 400 is bent, the connecting piece 400 is bent along the boundary line between the first body and the second body, so that the first body is on the same plane and the second body covers the first body. After the connecting piece 400 is bent, the first body and the second body form an approximately V-shaped or U-shaped structure.
[0031] In one embodiment of this utility model, the battery cell 300 includes a battery cell body 310 and positive and negative electrode tabs disposed at both ends of the battery cell body 310; the connecting piece 400 includes a positive connecting piece and a negative connecting piece, the positive connecting piece being connected to the positive electrode tab, and the negative connecting piece being connected to the negative electrode tab. Correspondingly, there are two openings 110, located at both ends of the housing 100, and the cover plates 200 are arranged corresponding to each opening 110; the positive connecting piece is connected to one of the cover plates 200, and the negative connecting piece is connected to the other cover plate 200. The connecting piece 400 is made of conductive metal; preferably, the positive connecting piece is made of aluminum, and the negative connecting piece is made of copper.
[0032] Furthermore, the cover plate 200 includes a cover plate body 210 and an electrode block 220 that penetrates and is embedded in the cover plate body 210. The connecting piece 400 is connected to the electrode block 220, and the electrode block 220 is insulated from the cover plate body 210.
[0033] In one embodiment of this utility model, the number of battery cells 300 is one. In an alternative embodiment of this utility model, the number of battery cells 300 is multiple, and the multiple battery cells 300 are arranged in parallel and all are connected to the connecting piece 400. Specifically, as shown... Figure 2 As shown, there are two battery cells 300, which are connected in parallel. The positive electrode tabs of the two battery cells 300 are connected together and then welded to the positive electrode connecting piece. The negative electrode tabs of the two battery cells 300 are connected together and then welded to the negative electrode connecting piece.
[0034] In one embodiment of this utility model, the lithium-ion battery further includes an adhesive tape 500, which is adhered to the tab 320. One end of the connecting piece 400 connected to the tab 320 is located between the adhesive tape 500 and the battery cell 300. After the connecting piece 400 is welded to the tab 320, the adhesive tape 500 is adhered to the tab 320. On the one hand, the adhesive tape 500 can completely cover the tab 320, reducing the risk of internal shorting of the tab 320; on the other hand, it fixes the welded portion between the connecting piece 400 and the tab 320, preventing the connection from becoming loose.
[0035] In one embodiment of this utility model, the lithium-ion battery further includes a separator 600, which is disposed between the cell 300 and the housing 100. The separator 600 includes a side plate 610 and end plates 620 disposed at both ends of the side plate 610. The side plate 610 is disposed on one side of the cell 300, and the end plates 620 are disposed at the ends of the cell 300. By replacing the inner spacer with the separator 600, the assembly structure is optimized. The end plates 620 on both sides are located at both ends of the tabs 320, so that the ends of the cell 300 form a plane, which can avoid stress on the tabs 320. Weight reduction holes are provided on the end plates 620 to reduce the weight of the end plates 620.
[0036] like Figure 3 As shown, in one embodiment of this utility model, the lithium-ion battery further includes a separator film 700. The separator film 700 is adhered to the side of the cell 300, and both ends of the separator film 700 extend to the side plate 610. After the separator plate 600 is snapped onto the cell 300, the separator film 700 is adhered to the cell 300, with both ends extending to the side plate 610, to wrap the cell 300 and prevent the cell 300 from contacting the outer casing and causing a short circuit in the battery.
[0037] like Figures 2 to 5 As shown, during assembly, the positive tabs of the two battery cells 300 are connected together and then soldered to the positive connecting piece. Similarly, the negative tabs of the two battery cells 300 are connected together and then soldered to the negative connecting piece. Next, adhesive tape 500 is applied to the tabs 320, completely covering them. Then, spacers 600 are installed on both sides of the battery cells 300, positioning the end plates 620 at the ends of the battery cells 300, thus snapping the two battery cells 300 together. Finally, large-area adhesive (i.e., insulating film 700) is applied to both sides of the battery cells 300, attaching it to the spacers 600 on both sides, forming a ring structure of spacer 600-large-area adhesive-spacer 600-large-area adhesive, thus fixing the two battery cells 300 together. Then, the battery cell 300 is installed into the housing 100, and the two ends of the connecting piece 400 are welded to the tab 320 of the battery cell 300 and the cover plate 200 respectively. At this time, there is an angle between the cover plate 200 and the opening 110. Then, the cover plate 200 is flipped over, and the connecting piece 400 is bent to seal the cover plate 200 over the opening 110, and the cover plate 200 is welded to the housing 100.
[0038] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.
Claims
1. A lithium-ion battery, characterized in that, It includes a housing, a cover plate, a battery cell, and a connecting piece; the housing has an opening, and the cover plate covers the opening; the battery cell is disposed inside the housing; the connecting piece is disposed between the cover plate and the battery cell; one end of the connecting piece is connected to the electrode tab of the battery cell, and the other end is bent and connected to the cover plate.
2. The lithium-ion battery according to claim 1, characterized in that, The connecting piece includes a first body and a second body connected to the first body. The first body is connected to the electrode tab of the battery cell, and the second body is connected to the cover plate. The projection of the first body on the cover plate and the projection of the second body on the cover plate at least partially overlap.
3. The lithium-ion battery according to claim 2, characterized in that, The second body is located between the first body and the cover plate, and the first body and the second body are integrally bent into shape.
4. The lithium-ion battery according to claim 1, characterized in that, The battery cell includes a battery cell body and positive electrode tabs and negative electrode tabs disposed at both ends of the battery cell body; the connecting piece includes a positive electrode connecting piece and a negative electrode connecting piece, the positive electrode connecting piece being connected to the positive electrode tab, and the negative electrode connecting piece being connected to the negative electrode tab.
5. The lithium-ion battery according to claim 4, characterized in that, There are two openings, and the cover plates are configured to correspond one-to-one with the openings; the positive electrode connecting piece is connected to one of the cover plates, and the negative electrode connecting piece is connected to the other cover plate.
6. The lithium-ion battery according to claim 1, characterized in that, The cover plate includes a cover plate body and an electrode block that penetrates and is embedded in the cover plate body, and the connecting piece is connected to the electrode block.
7. The lithium-ion battery according to claim 1, characterized in that, The number of battery cells is one; or the number of battery cells is multiple, and the multiple battery cells are arranged in parallel and are all connected to the connecting piece.
8. The lithium-ion battery according to claim 1, characterized in that, The lithium-ion battery also includes an adhesive tape, which is attached to the tab, and one end of the connecting piece connected to the tab is located between the adhesive tape and the battery cell.
9. The lithium-ion battery according to claim 1, characterized in that, The lithium-ion battery further includes a separator, which is disposed between the cell and the casing; the separator includes a side plate and end plates disposed at both ends of the side plate, the side plate being disposed on one side of the cell and the end plates being disposed at the end of the cell.
10. The lithium-ion battery according to claim 9, characterized in that, The lithium-ion battery also includes a separator film, which is attached to the side of the cell and extends to the side plate at both ends.