CN211980808U - Soft package lithium ion battery cell structure - Google Patents
Soft package lithium ion battery cell structure Download PDFInfo
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- CN211980808U CN211980808U CN202020742339.XU CN202020742339U CN211980808U CN 211980808 U CN211980808 U CN 211980808U CN 202020742339 U CN202020742339 U CN 202020742339U CN 211980808 U CN211980808 U CN 211980808U
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- battery cell
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a soft package lithium ion battery cell's structure, the utmost point ear of its electric core is located the both sides of electric core to utmost point ear is for the central line biasing of electric core, and utmost point ear is apart from the minor face distance at electric core edge and is greater than or equal to 5 mm. The electric core adopts a packaging mode that an aluminum plastic film is punched into a single pit or a double pit and then folded, and then three sides are sealed; the four corners of the battery cell adopt special-shaped arc end socket angle sealing structures, and the corner sealing structures of arc corners and bevel edges are adopted. The utility model discloses well electric core utmost point ear adopts the biasing structure, the inside space of utilization module that can be better, makes arranging of collection pencil and receiver more orderly reasonable to can avoid the potential safety hazard that causes in a jumble because of the collection pencil. The mode of electric core three-sided sealing makes electric core width direction do bigger, promotes energy density, does not need the mode of aluminium-plastic membrane fifty percent discount to take on one side of encapsulation simultaneously, can not produce because of the aluminium-plastic membrane cuts bad safety problems such as short circuit that has the burr to pierce through the aluminium-plastic membrane.
Description
Technical Field
The utility model relates to a lithium ion battery technical field, concretely relates to soft packet of lithium ion battery cell's structure.
Background
With the vigorous development of new energy electric vehicles, lithium ion batteries are receiving more and more attention as important components of electric vehicles, especially for their characteristics of energy density, safety, durability, and the like. The performance and structure of the cell, which is used as a basic unit of the lithium ion battery, have decisive influence on the energy density, safety, durability and the like of the lithium ion battery. Therefore, how to improve the energy density and ensure the safety and durability in the modules with uniform size and specification becomes a subject of controversial research in each electrical core factory.
At present soft-packaged electrical core manufacturing enterprise, after having processed soft-packaged electrical core, generally only do the hem to both sides limit and handle, and do not do the corner cut to its four corners and handle, can increase the degree of difficulty of hem like this, transport or the module assembling process at electric core easily simultaneously, appear that the four corners is gouged or other electric core surfaces of fish tail, appear risks such as weeping or short circuit even.
Chinese utility model patent publication No. CN 207009572U discloses a hem and corner seal structure of soft package lithium battery, is after soft package lithium battery preparation is accomplished, carries out the corner seal to its four corners, cuts out its bight with the frock mould after the corner seal (as shown in fig. 1), then carries out double-folding to the side, wraps up the metal part in the middle of the plastic-aluminum packaging film in the hem. The difficulty of the flexible package lithium ion battery in assembly is improved, the safety of the flexible package battery module after assembly is improved, the assembly space is saved, and the battery short circuit is prevented.
However, the above-mentioned prior art has the following disadvantages:
1) the mode of sealing four sides and folding two sides simultaneously is adopted, when the module is assembled, the sides face downwards, the folded part still occupies about 2mm of space, and the space in the module cannot be utilized to the utmost extent;
2) adopt four sides to seal and the mode of both sides limit hem simultaneously, if the side plastic-aluminum membrane cuts badly, probably can pierce the plastic-aluminum membrane in hem or later stage use and cause weeping or short circuit risk.
SUMMERY OF THE UTILITY MODEL
The utility model provides a soft packet of lithium ion battery cell's structure, its aim at:
1) in order to further improve the energy density in the modules with the same specification and size and meet the requirement of the modules or the battery packs for larger electric quantity;
2) in order to avoid risks such as short circuit or liquid leakage at four corners and side edges of the battery cell, the safety performance is improved, and meanwhile, the assembly of the module is more convenient and faster;
3) further promote soft-packaged electrical core's security performance, under the abuse circumstances such as taking place to overcharge, can in time release the inside a large amount of gas that produces of electric core at the preferential breach in circular arc angle seal position of electric core, reduce electric core internal pressure in the twinkling of an eye, prevent further harm's such as explosion emergence.
In order to achieve the above object, the present invention provides the following technical solutions:
the pole lugs of the battery cell are positioned on two sides of the battery cell and offset relative to the central line of the battery cell, and the distance between the pole lugs and the short edge of the battery cell edge is not less than 5 mm.
Preferably, the battery core adopts a packaging mode that an aluminum-plastic film is punched into a single pit or a double pit and then folded in half, and then three sides are sealed.
Preferably, the four corners of the battery cell adopt special-shaped arc end socket angle sealing structures, and the corner sealing structures of the arc corners and the bevel edges are adopted.
Preferably, the first corner of the battery cell adopts a special-shaped arc end socket angle sealing structure and a corner cutting structure of an arc angle, and the second corner of the battery cell adopts a special-shaped arc end socket angle sealing structure and a corner cutting structure of an arc angle and a bevel edge.
Preferably, the arc radius in the special-shaped arc end socket angle sealing structure is 2-10mm, and the angle of the cutting angle of the bevel edge is 10-80 degrees.
Preferably, the side seal of the battery core adopts a folded edge structure.
Preferably, the folding structure is a folded edge structure or a two-folded edge structure.
Preferably, a protective adhesive tape is arranged at the side seal of the battery core after the edge is folded.
Preferably, the thickness of the protective tape is 0.03-0.08 mm, and the width of the protective tape is 10-100 mm.
The utility model provides a soft packet of lithium ion cell's structure, it has following beneficial effect:
1) according to the technical scheme of the utility model, the battery core tab adopts a bias structure, so that the space inside the module can be better utilized, and the arrangement of the acquisition wiring harness and the receiver is more orderly and reasonable, thereby avoiding the potential safety hazard caused by disordered acquisition wiring harnesses;
2) according to the utility model discloses technical scheme, electric core adopts trilateral encapsulation and the mode of filleting angle, for the encapsulated mode of four sides seal, the mode that trilateral was sealed more makes electric core width direction do bigger, promote energy density, do not need the mode of taking the plastic-aluminum membrane fifty percent discount on one side of encapsulation simultaneously, can not produce because of the plastic-aluminum membrane cuts the safety problem that bad burr and impale and arouse the short circuit, the encapsulation equipment that corresponds on one side of the encapsulation less moreover can be a few side seal head, reduce equipment input and equipment energy consumption, promote production efficiency. The mode of fillet for electric core is easier in the module equipment, and can not cause potential safety hazards such as weeping because of knocking the angle. Under the abuse condition such as take place overcharge, can in time release the inside a large amount of gases that produce of electric core in the preferential breach of circular arc angle seal position of electric core, reduce electric core internal pressure in the twinkling of an eye, prevent further harm's such as explosion emergence.
3) According to the utility model discloses technical scheme, the side that needs the heat-seal adopts the hem whole side to carry out the mode of rubber coating simultaneously, has avoided cutting harmfully because of the plastic-aluminum membrane has the burr to pierce through safety problems such as short circuit and arouse the plastic-aluminum membrane furthest.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
FIG. 1 is a folding and corner sealing structure of a conventional soft package lithium battery;
fig. 2 is a schematic diagram of a soft-packaged lithium ion battery cell provided in an embodiment of the present invention, which is not encapsulated after corner cutting of the battery cell;
fig. 3a is a schematic view of a single hole punched by an aluminum-plastic film in a structure of a soft package lithium ion battery cell provided by an embodiment of the present invention;
fig. 3b is a schematic diagram of punching two pits on an aluminum-plastic film in the structure of the soft-package lithium ion battery cell provided by the embodiment of the present invention;
fig. 4a is a schematic side view of an aluminum-plastic film after being folded into a single pit in a punching manner in the structure of the soft-package lithium ion battery cell provided by the embodiment of the present invention;
fig. 4b is a schematic side view of the soft-package lithium ion battery cell according to the embodiment of the present invention after the aluminum-plastic film is folded into two pits;
fig. 5 is an enlarged schematic view of a first corner of a soft-package lithium ion battery cell in the structure provided by the embodiment of the present invention;
fig. 6 is an enlarged schematic view of a second corner of a battery cell in the structure of the soft-package lithium ion battery cell provided by the embodiment of the present invention;
fig. 7a is a schematic view showing a cell side edge folding and enlarging in the structure of the soft-package lithium ion cell provided by the embodiment of the present invention;
fig. 7b is a schematic view showing a cell side edge folding enlargement in the structure of the soft-package lithium ion cell provided by the embodiment of the present invention;
fig. 8 is the embodiment of the utility model provides a schematic diagram behind the whole rubber coating of electricity core side in the structure of soft packet of lithium ion battery cell.
Description of reference numerals:
1. an electric core; 2. a tab; 3. a first corner; 4. a second corner; 5. and (7) side sealing and sealing.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
A structure of a soft package lithium ion battery cell is shown in figure 2, tabs 2 of a battery cell 1 are located on two sides of the battery cell 1, the tabs 2 are offset relative to a central line of the battery cell 1, and the distance between the tabs 2 and a short edge of the battery cell 1 is not less than 5 mm.
As shown in fig. 3a and fig. 4a, the battery cell 1 is packaged by punching a single hole in an aluminum-plastic film, folding the single hole in half, and then sealing three sides of the single hole.
As shown in fig. 3b and fig. 4b, the battery cell 1 is packaged by punching a double pit on an aluminum-plastic film, folding the punched pit in half, and then sealing three sides.
As shown in fig. 2, the four corners of the battery cell 1 adopt special-shaped circular arc end socket corner sealing structures, and after the corner sealing, the corner sealing structures of circular arc corners and bevel edges are adopted. Preferably, as shown in fig. 5, the first corners 3 of the battery core (two corners on the lower side of the battery core 1) adopt a special-shaped arc end socket corner sealing structure and an arc corner cutting structure. As shown in fig. 6, the second corners 4 (two corners on the upper side of the battery cell 1) of the battery cell 1 adopt a special-shaped arc head corner seal structure and a corner cut structure with an arc corner and a bevel edge. Further preferably, the arc radius in the special-shaped arc seal head angle sealing structure is 2-10mm, and the angle of the bevel edge is 10-80 degrees.
As shown in fig. 7a and 7b, the side seal 5 of the battery cell 1 adopts a folded edge structure. The folding structure is a folding structure (figure 7b) or a two-folding structure (figure 7 a).
As shown in fig. 8, a protective tape is disposed at the side seal 5 of the battery cell 1 after the edge folding. The thickness of the protective adhesive tape is preferably 0.03-0.08 mm, and the width of the protective adhesive tape is preferably 10-100 mm.
As shown in fig. 2, the tabs 2 of the battery cell 1 are located on two sides of the battery cell 1, and the positions of the tabs 2 are not centered, but are offset. The distance between the lug 2 and the short edge of the battery core 1 is not less than 5 mm.
As shown in fig. 3a and fig. 4a, the battery cell 1 is packaged by punching a single hole in an aluminum-plastic film, folding the single hole in half, and then sealing three sides of the single hole.
As shown in fig. 3b and fig. 4b, the battery cell 1 is packaged by punching a double pit on an aluminum-plastic film, folding the punched pit in half, and sealing three sides of the punched pit.
As shown in fig. 2, arc corner sealing of special-shaped end sockets is performed at four corners of the battery cell 1, and corner cutting processing of the arc corners and the bevel edges is performed after the corner sealing.
As shown in fig. 5 and 6, the first corners 3 of the cell (two corners on the lower side of the cell 1) are subjected to special-shaped arc head corner sealing and corner cutting of the arc corners. The second corners 4 of the cell (two corners on the upper side of the cell 1) are subjected to special-shaped arc end socket angle sealing, and arc corners and bevel edges are subjected to corner cutting.
Preferably, the arc radius of the special-shaped arc seal head angle seal is 2-10mm, and the angle of the cutting angle of the bevel edge is 10-80 degrees.
As shown in fig. 7a and 7b, the side seal 5 of the battery cell 1 is subjected to a folding process, wherein the folding process is one of folding (fig. 7b) and folding (fig. 7 a).
After flanging, the side seal area (at side seal 5) is subjected to an integral taping process, as shown in fig. 8. The coated tape is used as a protective tape, and the side seal region (side seal 5) can be well protected by the protective tape.
Preferably, the thickness of the protective tape is 0.03-0.08 mm, and the width of the protective tape is 10-100 mm.
The structure of soft package lithium ion battery cell that this embodiment provided, it has following beneficial effect:
1) the battery cell lug adopts a bias structure, so that the space inside the module can be better utilized, the arrangement of the acquisition wiring harness and the receiver is more orderly and reasonable, and the potential safety hazard caused by disordered acquisition wiring harnesses can be avoided;
2) electric core adopts trilateral encapsulation and the mode of cutting the fillet, and for the encapsulation mode of four sides seal, the mode that the three sides sealed more makes electric core width direction do bigger, promotes energy density, does not need the mode of taking the plastic-aluminum membrane fifty percent discount on one side of encapsulation simultaneously, can not produce because of the plastic-aluminum membrane cuts the safety problem that bad burr and impale and arouse the short circuit, and encapsulation equipment that corresponds on one side of encapsulating less moreover can a pair side seal head less, and reduction equipment drops into and equipment energy consumption, promotes production efficiency. The mode of cutting the round angle enables the battery cell to be easier to assemble in the module group, and potential safety hazards such as liquid leakage and the like caused by the angle knocking can be avoided; under the abuse condition such as take place overcharge, can in time release the inside a large amount of gases that produce of electric core in the preferential breach of circular arc angle seal position of electric core, reduce electric core internal pressure in the twinkling of an eye, prevent further harm's such as explosion emergence.
3) According to the utility model discloses technical scheme, the side that needs the heat-seal adopts the hem whole side to carry out the mode of rubber coating simultaneously, has avoided cutting harmfully because of the plastic-aluminum membrane has the burr to pierce through safety problems such as short circuit and arouse the plastic-aluminum membrane furthest.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (7)
1. The structure of the soft package lithium ion battery cell is characterized in that tabs of the battery cell are positioned on two sides of the battery cell and offset relative to the central line of the battery cell, and the distance between the tabs and the short edge of the battery cell is not less than 5 mm;
the battery core adopts a packaging mode that an aluminum plastic film is punched into a single pit or a double pit and then folded, and then three sides are sealed;
four angles of the battery cell adopt special-shaped arc end socket angle sealing structures, and adopt arc angles and bevel edge corner cutting structures after angle sealing.
2. The structure of the soft package lithium ion battery cell of claim 1, wherein the first corner of the battery cell adopts a special-shaped arc head corner seal structure and a corner cut structure of an arc corner, and the second corner of the battery cell adopts a special-shaped arc head corner seal structure and a corner cut structure of an arc corner and a bevel edge.
3. The soft package lithium ion battery cell structure of claim 1 or 2, wherein the arc radius in the special-shaped arc seal head angle sealing structure is 2-10mm, and the angle of the cutting angle of the bevel edge is 10-80 °.
4. The structure of the soft package lithium ion battery cell of claim 1, wherein the side seal of the battery cell adopts a folded edge structure.
5. The structure of the soft package lithium ion battery cell of claim 4, wherein the flanging structure is a folded flanging structure or a two-folded flanging structure.
6. The structure of the soft package lithium ion battery cell of claim 4 or 5, wherein a protective tape is arranged at the side seal of the cell after the edge is folded.
7. The soft package lithium ion battery cell structure of claim 6, wherein the thickness of the protective tape is 0.03-0.08 mm, and the width of the protective tape is 10-100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020742339.XU CN211980808U (en) | 2020-05-08 | 2020-05-08 | Soft package lithium ion battery cell structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020742339.XU CN211980808U (en) | 2020-05-08 | 2020-05-08 | Soft package lithium ion battery cell structure |
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| CN211980808U true CN211980808U (en) | 2020-11-20 |
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| CN202020742339.XU Active CN211980808U (en) | 2020-05-08 | 2020-05-08 | Soft package lithium ion battery cell structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325436A (en) * | 2021-12-24 | 2022-04-12 | 华鼎国联四川动力电池有限公司 | Calibration method for DCIR test value |
| CN115692863A (en) * | 2022-11-04 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Structure and encapsulation method of battery core, battery monomer, energy storage device and electric equipment |
-
2020
- 2020-05-08 CN CN202020742339.XU patent/CN211980808U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325436A (en) * | 2021-12-24 | 2022-04-12 | 华鼎国联四川动力电池有限公司 | Calibration method for DCIR test value |
| CN114325436B (en) * | 2021-12-24 | 2023-10-10 | 华鼎国联四川动力电池有限公司 | Calibration method of DCIR test value |
| CN115692863A (en) * | 2022-11-04 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Structure and encapsulation method of battery core, battery monomer, energy storage device and electric equipment |
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