CN221282317U - Battery monomer and battery device - Google Patents
Battery monomer and battery device Download PDFInfo
- Publication number
- CN221282317U CN221282317U CN202322907373.4U CN202322907373U CN221282317U CN 221282317 U CN221282317 U CN 221282317U CN 202322907373 U CN202322907373 U CN 202322907373U CN 221282317 U CN221282317 U CN 221282317U
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- battery cell
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- battery
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- 239000000178 monomer Substances 0.000 title description 6
- 238000003466 welding Methods 0.000 claims abstract description 57
- 238000010276 construction Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to the technical field of batteries and provides a battery cell and a battery device. The battery cell includes: a housing including a cover plate; the battery cell is arranged in the shell, and a tab is arranged on the battery cell; a pole assembly disposed on the cover plate, comprising: the pole is provided with a riveting part, a flanging is formed after the riveting part is assembled with the cover plate, and the riveting part is provided with an electric connection area which is not overlapped with the flanging; wherein utmost point ear is connected with the riveting portion electricity, includes: the electrode lug is directly connected with the electric connection area; and/or the tab is indirectly connected with the electric connection region. According to the application, a certain distance can be kept between the lug and the flanging by optimizing the internal structure of the battery cell, so that the welding heat during welding can be prevented or reduced from being directly accumulated at the position of the flanging formed by the riveting part, and the situation that the internal resistance of the battery cell is increased due to welding of the lug and the adapter is avoided.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery monomer and a battery device.
Background
In the related art, along with the development of battery technology, batteries have the advantages of high energy density, high average output voltage, capability of rapid charge and discharge, long service life, safety, reliability and the like, and the application fields of the batteries are continuously expanded, such as the fields of electronic products, automobiles and electric vehicles, aerospace, micro-electro-mechanical systems, energy storage and the like.
The battery generally comprises a battery core, a shell, a pole post and other parts, when the battery is assembled, the pole post is generally riveted on the shell, and the pole lug of the battery core is connected with the pole post of the battery, for example, the battery is realized by adopting a welding mode and the like. When the tabs are welded, the generated welding heat is accumulated at the riveting positions of the poles, so that the situations of plastic failure and the like can be caused, and the internal resistance of the battery can be increased.
Disclosure of utility model
In view of the above, the present application is directed to a battery cell and a battery device, which are used for at least solving the technical problem of increased internal resistance of the battery caused by the battery assembling and fixing method in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, the present application provides a battery cell comprising:
the shell comprises a cover plate;
The battery cell is arranged in the shell, and a tab is arranged on the battery cell;
the utmost point post subassembly sets up on the apron includes: the pole is provided with a riveting part, a flanging is formed after the riveting part is assembled with the cover plate, and the riveting part is provided with an electric connection area which is not overlapped with the flanging;
Wherein the tab is electrically connected with the rivet portion, comprising: the electrode lug is directly connected with the electric connection area; and/or the tab is indirectly connected with the electric connection region.
In a second aspect, the present application provides a battery device comprising: according to some embodiments of the application.
In the above technical scheme, a battery monomer is provided, through optimizing the internal structure of the battery monomer, its utmost point post column riveting portion, wherein the riveting portion has formed the turn-ups structure after fixing with the apron of casing, and connect the utmost point ear through reserving the electric connection district on the riveting portion, because electric connection district and turn-ups do not overlap, can make keeping certain distance between utmost point ear and the turn-ups this moment, the welding heat when can avoiding or reducing welding directly piles up in the position of the turn-ups that the riveting portion formed, can not lead to "to causing battery monomer internal resistance to increase because of welding utmost point ear and adaptor" the condition takes place.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram illustrating the assembly of a cover plate and a post assembly in a battery cell according to an exemplary embodiment;
FIG. 2 is another schematic view of a battery cell middle cover plate and post assembly assembled according to an exemplary embodiment;
FIG. 3 is a cross-sectional view of the cap plate and pole assembly of FIG. 2 assembled;
FIG. 4 is a schematic view of an "L-shaped" plate-like structure shown according to an exemplary embodiment;
FIG. 5 is a schematic diagram of a "flat panel structure" shown according to an exemplary embodiment;
Fig. 6 is a schematic diagram of another "flat panel structure" shown according to an exemplary embodiment.
In the figure: 10. a cover plate; 101. a limit structure; 20. a pole; 201. a caulking part; 30. an adapter; 301. a first connection portion; 301A, riveting a plate section; 301B, a riveting zone; 302. a second connecting portion; 302A, welding plate sections; 302B, a welding area; 303A, locating plate sections; 303B, a security area; 3021. a first welded portion; 3022. a second welded portion; 401. and a tab.
Detailed Description
The application is further described in detail below by means of the figures and examples. The features and advantages of the present application will become more apparent from the description.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
In the related art, a battery generally includes a cell, a case, a post, and the like. When the battery is assembled, the pole is generally riveted on the shell, and the pole lug of the battery core is connected with the battery pole, for example, by adopting a welding mode and the like. When the pole is riveted on the shell, the flanging thickness is designed to be thinner for convenient calendaring. When the tab is welded, the generated welding heat is directly accumulated at the flanging position formed by the riveting part of the tab, and after the heat is accumulated at the thinner flanging, the situations such as plastic failure and the like can be caused, so that the internal resistance of the battery is increased.
The application provides a battery cell, which is characterized in that a pole of the battery cell is riveted on a cover plate of a shell through optimizing the internal structure of the battery cell, a flange formed when the riveting part is riveted on the cover plate is fixed, and when a tab is welded and connected with the pole, the tab is connected with an electric connection area of the riveting part, and the electric connection area is kept at a certain distance from the flange, so that welding heat during welding can be prevented or reduced from being directly accumulated at the position of the flange formed by the riveting part, and the situation that the internal resistance of the battery cell is increased due to welding of the tab and an adapter is avoided.
The technical solution of the present embodiment is described in detail below with reference to the accompanying drawings, and the following embodiments and implementations may be combined with each other without conflict.
In an exemplary embodiment of the present utility model, as shown in fig. 1 and fig. 5 to 6, fig. 1 is a schematic diagram illustrating an assembly of a cap plate and a post assembly in a battery cell according to an exemplary embodiment. The battery cell includes: a housing including a cover plate 10; the battery cell is arranged in the shell, and a tab 401 is arranged on the battery cell; a pole assembly disposed on the cap plate 10, comprising: a pole 20, wherein the pole 20 is provided with a riveting part 201, a flanging is formed after the riveting part 201 is assembled with the cover plate 10, and the riveting part 201 is provided with an electric connection area which is not overlapped with the flanging; wherein tab 401 is electrically connected with rivet 201, comprising: the tab 401 is directly connected with the electric connection area; and/or, the tab 401 is indirectly connected with the electrical connection region. Because the electric connection area keeps a certain distance with the flanging, when the tab is welded to realize the connection between the tab 401 and the pole 20, the situation that the internal resistance of the battery is increased due to the fact that the welding heat is directly accumulated at the flanging formed by the riveting part 201 during welding can be avoided, and the heat generated by the welding tab is accumulated at the flanging can be avoided.
In some exemplary embodiments, to facilitate connection of tab 401 to pole 20, an adapter component may also be provided to effect an indirect connection of pole 20 to tab 401. Illustratively, the battery cell further comprises: the adapter 30 has a first connection portion 301 and a second connection portion 302 formed thereon. The first connection portion 301 is used to cooperate with the riveting portion 201, fix the first connection portion on the inner side of the cover plate 10 through the flanging formed by extrusion, and synchronously realize connection between the first connection portion 301 and the electrical connection region; the second connection portion 302 is used for welding the tab 401. Wherein the first connection portion 301 and the second connection portion 302 are respectively formed in different regions of the adaptor 30. The first connecting portion 301 is located closer to the caulking portion 201, and the tab 401 is connected to the second connecting portion 302, so that indirect connection between the tab 401 and the caulking portion 201 of the pole is achieved.
In the present exemplary embodiment, by optimizing the internal structure of the battery cell, the post 20 thereof forms the rivet portion 201 and is rivet-jointed to the case in cooperation with the first connection portion 301 of the adapter 30, and the second connection portion 302 of the adapter 30 is welded to the tab 401 of the battery cell. Since there is no common portion between the first connection portion 301 and the second connection portion 302, a certain distance can be maintained between the rivet portion 201 and the second connection portion 302 after the internal structure assembly of the battery cell is completed, and it is possible to prevent welding heat during welding from being directly accumulated at the position of the flange formed by the rivet portion 201.
In the process of assembling and manufacturing the battery cell, the riveting part 201 of the pole 20 is connected with the first connecting part 301 of the adapter 30, and then the adapter is welded with the pole lug 401; by not overlapping the welded portion of the tab 401 and the portion of the caulking portion 201, it is possible to prevent or reduce the welding heat from directly accumulating at the burring position during welding. Based on this, the situation of "the internal resistance of the battery cell increases due to welding of the tab 401 and the adapter 30" can be effectively avoided.
In some exemplary embodiments, it is not desirable to make the volume of the battery cell too large, and the tab 401 of the cell may take various forms such as side out (cell side out) or ejection (cell top out). In order for the adapter 30 to adapt the space between the electrical core and the housing.
In some exemplary embodiments, as shown in fig. 2-4, the battery cells for the side tab 401 may employ a folded plate structure as the adapter 30, such as an "L-shaped" plate structure, or the like. In the present exemplary embodiment, the adapter 30 adopts a folded plate structure, including: a rivet plate segment 301A forming a first connection 301 and a weld plate segment 302A forming a second connection 302. The riveting plate section 301A is connected with the welding plate section 302A, and the riveting plate section 301A forms a preset folding angle with the welding plate section 302A. Illustratively, the preset folding angle ranges from 85 ° to 95 °.
Considering that the flatness of the caulking portion 201 of the conventional pole 20 is poor, it may occur that the foil of the tab 401 is scratched when the tab 401 is overlapped with the caulking portion 201. Based on the optimization of the preset folding angle of the butt welding plate section 302A and the riveting plate section 301A, the situation that the side, where the tab 401 of the battery cell extends out, is located on the different side of the battery cell from the riveting part 201 can be effectively avoided.
Specifically, when the adaptor 30 is assembled with the pole assembly, the riveted plate segment 301A extends along the inner surface of the top plate of the housing; the welding plate segment 302A is provided extending along the inner surface of the side wall of the case corresponding to the tab 401. The folded plate structure within the preset angle range can ensure that the slit space formed between the shell and the battery core can be better utilized on the premise of effectively connecting the pole 20 and the pole lug 401 by the adapter 30 inside the battery cell.
Alternatively, the preset folding angle may be set to 89 ° or 90 ° or 91 °, or the like.
As shown in fig. 2-4, the adapter 30 further includes: the positioning plate section 303A is configured to cooperate with the limiting structure 101 on the housing to position and assemble the adaptor 30 and the cover plate 10. Wherein the rivet plate segment 301A, the positioning plate segment 303A, and the welding plate segment 302A are connected in sequence.
It is contemplated that the attachment of the adapter 30 is accomplished at the same time as the staking of the adapter 30 to the housing in order to facilitate mating of the pole 20. In this embodiment, the adapter 30 is further optimized. On a folded plate structure, a welding plate section 302A, a positioning plate section 303A and a riveting plate section 301A are sequentially divided, the adapter 30 is limited by using a clamping groove formed on the inner top wall of the shell, positioning alignment of a riveting hole on the riveting plate section 301A and a riveting hole on the shell is completed, riveting is performed by a riveting part 201 on the pole 20, and the assembly process of the pole 20 on the shell is completed.
Considering that the distance between the welding plate section 302A where the tab 401 is welded to the adapter 30 and the caulking portion 201 of the pole 20 cannot be too small, the welding heat is easily transferred to the caulking portion 201 if too small; the distance should not be too large, and if too large, the length of the adaptor may be too large, and the length of the cover plate 10 may affect the setting of the battery size and the exertion of the battery capacity, which may also cause the increase of the weight of the battery. Illustratively, as shown in FIGS. 2-4, the positioning plate segment 303A has a width m 1 in the range of 1mm to 100mm. The width m 1 of the positioning plate segment 303A is a distance between a first edge connected to the first connecting portion 301 and a second edge connected to the second connecting portion 302.
It should be noted that, if the adaptor 30 is in an "L-shaped" plate structure, when the positioning plate segment 303A includes a portion at a bending angle, the width m 1 is a linear distance between the welding plate segment 302A and the riveting plate segment 301A after the adaptor 30 is flattened.
Taking into account thatThe ratio of (3) cannot be too small, when the ratio is too small, compared with s 1, when the battery cell is subjected to short time, the current is larger, when the time is longer, the structural member is not disconnected, the battery cell is not well protected, the thermal runaway of the battery cell can be caused,When the ratio of the two components is not too large, compared with s 1, the ratio is smaller, and under normal use, the temperature of the structural part is higher, so that the temperature rise of the battery core is increased, and the performance of the battery core is reduced. Illustratively, as shown in fig. 2-4, the width m 1 of the locating plate segment 303A and the minimum overcurrent cross-sectional area s 1 of the locating plate segment 303A satisfy the following equation:
Wherein the minimum cross-sectional area s 1 of the positioning plate segment 303A is the minimum cross-sectional area of the positioning plate segment 303A.
In some exemplary embodiments, as shown in fig. 5, fig. 5 is a schematic diagram of a "flat panel structure" shown according to an exemplary embodiment. The battery cell for the ejection tab 401 may employ a "flat plate structure" as the adapter 30. Optionally, the tab 401 at least partially covers the rivet 201 of the pole 20. On the one hand, burrs of the caulking portion 201 can be prevented from leaking out, and on the other hand, overcurrent can be provided.
The distance between the welding part of the tab 401 and the adapter and the rivet 201 cannot be too small, and if too small, the welding heat is easily transferred to the rivet 201; the distance should not be too large, which may cause the length of the adaptor to be too large, and the length of the cover plate 10 to be too large may affect the size of the battery and the capacity of the battery to be exerted, which may also cause the weight of the battery to be increased. Illustratively, the adapter 30 is of a flat plate construction, including: a caulking region 301B forming the first connection portion 301 and a welding region 302B forming the second connection portion 302, wherein a preset interval is reserved between the caulking region 301B and the welding region 302B, and the preset interval ranges from 1mm to 100mm.
It should be noted that, if the adaptor 30 is in a flat plate structure, the preset distance is relatively easy to determine, i.e. the linear distance between the riveting zone 301B and the welding zone 302B.
In some exemplary embodiments, as shown in fig. 5, fig. 5 is a schematic diagram of a "flat panel structure" shown according to an exemplary embodiment. The adapter 30 further includes: the security area 303B. In this embodiment, the fuse region 303B is located between the rivet region 301B and the bonding region 302B to form a predetermined distance, and the predetermined distance and the minimum overcurrent cross-sectional area s 2 of the fuse region 303B satisfy the following formula:
Wherein m 2 is a preset pitch.
Based on the setting of the range, on the one hand, the ratio can be avoidedToo small a situation occurs, so that thermal runaway of the battery cells is not caused when the battery cells are subjected to external short time; on the other hand can avoid the ratioThe too big condition appears, and the electric core is under normal use, can not cause the temperature rise of electric core to increase and then lead to causing the problem that electric core performance descends.
In some exemplary embodiments, considering that the welding area cannot be too large, too much heat is generated, which is liable to affect the caulking portion 201; the welding area cannot be too small and if too small, the overcurrent area cannot be satisfied. As shown in fig. 5, the area S Welding process of the bonding area 302B corresponding to the second connection portion 302 is in the range: 4mm 2～300mm2.
In some exemplary embodiments, as shown in fig. 6, fig. 6 is a schematic diagram of another "flat panel structure" shown according to an exemplary embodiment. The second connection portion 302 includes: the first and second welded portions 3021 and 3022, the first and second welded portions 3021 and 3022 being symmetrically arranged on both sides of the rivet region 301B. Wherein, a part of the tab 401 is connected to the first welded portion 3021, and another part of the tab 401 is connected to the second welded portion 3022. Through distributing the tab 401 on two sides of the riveting zone 301B, situations such as battery energy density discomfort caused by more layers of the tab 401 on one side affecting the welding effect or larger total thickness can be avoided.
Illustratively, the number of layers of tab 401 per weld ranges from 15 to 150.
Similarly, the total thickness of the tab 401 cannot be too large, and if the total thickness is too large, the welding energy is larger, so that the riveting structure is affected; the total thickness of tab 401 must not be too small and the battery energy density is required. The thickness of tab 401 is illustratively in the range of 0.06mm to 2.5mm.
In an exemplary embodiment of the present utility model, there is provided a battery device including: any one of the above battery cells.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are directions or positional relationships based on the operation state of the present application are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless otherwise specifically defined and limited. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The application has been described above in connection with preferred embodiments, which are, however, exemplary only and for illustrative purposes. On this basis, the application can be subjected to various substitutions and improvements, and all fall within the protection scope of the application.
Claims (14)
1. A battery cell, the battery cell comprising:
A housing including a cover plate;
The battery cell is arranged in the shell, and a tab is arranged on the battery cell;
the utmost point post subassembly sets up on the apron includes: the pole is provided with a riveting part, a flanging is formed after the riveting part is assembled with the cover plate, and the riveting part is provided with an electric connection area which is not overlapped with the flanging;
Wherein the tab is electrically connected with the rivet portion, comprising: the electrode lug is directly connected with the electric connection area; and/or the tab is indirectly connected with the electric connection region.
2. The battery cell of claim 1, wherein the battery cell further comprises:
The adapter is provided with a first connecting part and a second connecting part, the first connecting part is used for connecting the electric connecting area, and the second connecting part is used for welding the tab; wherein the first connection portion and the second connection portion are respectively formed in different regions of the adapter.
3. The battery cell of claim 2, wherein the adapter is in a folded plate configuration, comprising:
a rivet plate section forming the first connection portion;
a welding plate section forming the second connection portion;
The riveting plate section is connected with the welding plate section, and the riveting plate section and the welding plate section form a preset folding angle.
4. The battery cell of claim 3, wherein, when the adapter is assembled with the post assembly,
The riveting plate section extends along the inner surface of the top plate of the shell;
The welding plate section extends along the inner surface of the side wall of the shell corresponding to the tab.
5. The battery cell of claim 3 or 4, wherein the adapter further comprises:
The positioning plate section is used for being matched with a limiting structure on the shell so as to position and assemble the adapter and the cover plate;
the riveting plate section, the positioning plate section and the welding plate section are sequentially connected.
6. The battery cell of claim 5, wherein the positioning plate segment has a width m 1 in the range of 1mm to 100mm,
The width m 1 of the positioning plate section is the distance between the first edge connected with the first connecting portion and the second edge connected with the second connecting portion.
7. The battery cell of claim 6, wherein the width m 1 of the positioning plate segment and the minimum overcurrent cross-sectional area s 1 of the positioning plate segment satisfy the following formula:
Wherein the minimum cross-sectional area s 1 of the locating plate segment is the minimum cross-sectional area of the locating plate segment.
8. The battery cell of claim 2, wherein the adapter member is of a flat plate construction, comprising: a rivet region forming the first connection portion and a welding region forming the second connection portion,
The welding device comprises a riveting zone and a welding zone, wherein a preset interval is reserved between the riveting zone and the welding zone, and the range of the preset interval is 1-100 mm.
9. The battery cell of claim 8, wherein the second connection portion comprises: a first welding part and a second welding part which are symmetrically arranged at two sides of the riveting zone,
Wherein, a part of the tab is connected with the first welding part, and another part of the tab is connected with the second welding part.
10. The battery cell of claim 8, wherein the adapter further comprises:
A fuse region located between the rivet region and the bonding region to form the predetermined pitch,
Wherein, the preset distance and the minimum overcurrent cross-sectional area s 2 of the safety area satisfy the following formula:
Wherein m 2 is the preset interval.
11. The battery cell according to claim 2, wherein the area of the welding area corresponding to the second connection portion ranges from: 4mm 2～300mm2.
12. The battery cell of claim 1, wherein the number of layers of the tab ranges from 15 layers to 150 layers.
13. The battery cell of claim 1, wherein the tab has a thickness in the range of 0.06mm to 2.5mm.
14. A battery device, characterized in that the battery device comprises: the battery cell of any one of claims 1-13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322907373.4U CN221282317U (en) | 2023-10-27 | 2023-10-27 | Battery monomer and battery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322907373.4U CN221282317U (en) | 2023-10-27 | 2023-10-27 | Battery monomer and battery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221282317U true CN221282317U (en) | 2024-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322907373.4U Active CN221282317U (en) | 2023-10-27 | 2023-10-27 | Battery monomer and battery device |
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| Country | Link |
|---|---|
| CN (1) | CN221282317U (en) |
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2023
- 2023-10-27 CN CN202322907373.4U patent/CN221282317U/en active Active
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