CN217544689U - Battery with a battery cell - Google Patents
Battery with a battery cell Download PDFInfo
- Publication number
- CN217544689U CN217544689U CN202221170858.9U CN202221170858U CN217544689U CN 217544689 U CN217544689 U CN 217544689U CN 202221170858 U CN202221170858 U CN 202221170858U CN 217544689 U CN217544689 U CN 217544689U
- Authority
- CN
- China
- Prior art keywords
- side edge
- battery
- folding section
- section
- edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
A battery comprises a battery cell body and an encapsulation film for encapsulating the battery cell body, wherein the encapsulation film comprises a first encapsulation film and a second encapsulation film, the first encapsulation film is provided with a first side edge, the second encapsulation film is provided with a second side edge, and the first side edge and the second side edge are overlapped and bent to form a folded edge; the width of the first side edge is smaller than that of the second side edge; the first side edge is provided with at least one folding section; the second side edge is provided with a pre-folding section, a third folding section and a fourth folding section which are sequentially bent and connected, the fourth folding section is located on one side of the folded edge, which is farthest away from the side face of the battery, the third folding section is opposite to the side face of the battery, the pre-folding section is located on one side, deviating from the side face of the battery, of the third folding section, the end face of the first side edge is located on the third folding section, and the end face of the second side edge is located between the fourth folding section and the third folding section. The utility model discloses can avoid the metal terminal surface damage of side or pierce through the plastic-aluminum membrane of battery side, improve the security performance of battery.
Description
Technical Field
The utility model belongs to the technical field of the lithium cell, concretely relates to soft packet of lithium cell.
Background
The aluminum-plastic film is a common lithium battery packaging material, and is used for wrapping a battery core, hot-pressing the side edge of the aluminum-plastic film to form an edge sealing, and bending the edge sealing to form a folding structure of the battery. The cell can be folded by adopting a single folding process or a double folding process. Compared with a single-folded-edge structure, the first folding of the double-folded-edge structure faces the side face of the battery after being folded twice, so that the risk of short circuit caused by the fact that the metal end face of the side edge of the aluminum-plastic film is in contact with the external environment can be avoided. Fig. 1 is a schematic structural view of a double-folded battery. As shown in fig. 1, the battery includes a battery cell body 100, the battery cell body 100 is packaged by an aluminum-plastic film (not numbered), the aluminum-plastic film includes a first packaging film 101 and a second packaging film 102, a pit a for accommodating the battery cell body 100 is formed on the first packaging film 101 by stamping, and the second packaging film 102 and the first packaging film 101 are covered together to package the battery cell body 100 located in the pit a. The side edges of the first packaging film 101 and the second packaging film 102 are adhered together after hot pressing to form an edge seal. And bending the sealed edge twice to obtain a double-folded edge structure. As shown in fig. 1, after being bent twice, the edge-sealed metal end surfaces (the end surface 101a of the first packaging film 101 and the end surface 102a of the second packaging film 102) are not exposed outside the battery, but are located on the side of the folded edge opposite to the side surface of the battery, so that short circuit caused by the metal end surfaces contacting the external environment can be prevented, but during the processing or using process, the sharp metal end surfaces may still scratch or even pierce the aluminum-plastic film on the side surface of the battery, thereby causing a safety hazard.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a battery that security performance is high.
A battery comprises a battery cell body and an encapsulation film for encapsulating the battery cell body, wherein the encapsulation film comprises a first encapsulation film and a second encapsulation film, the first encapsulation film is provided with a first side edge, the second encapsulation film is provided with a second side edge, and the first side edge and the second side edge are overlapped and bent to form a folded edge; the width of the first side edge is smaller than that of the second side edge; the first side edge is provided with at least one folding section; the second side edge is provided with a pre-folding section, a third folding section and a fourth folding section which are sequentially bent and connected, the fourth folding section is located on one side of the folded edge, which is farthest away from the side face of the battery, the third folding section is opposite to the side face of the battery, the pre-folding section is located on one side, deviating from the side face of the battery, of the third folding section, the end face of the first side edge is located on the third folding section, and the end face of the second side edge is located between the fourth folding section and the third folding section.
Furthermore, a first pit groove is formed in the second packaging film, the first packaging film is of a planar structure, or a second pit groove corresponding to the first pit groove is formed in the first packaging film, and the depth of the second pit groove is smaller than that of the first pit groove.
Furthermore, the depth of the first pit groove is 3.1 mm-5.0 mm.
Furthermore, the depth of the second pit groove is 1.2 mm-2.7 mm.
Furthermore, the first side edge is provided with a first folding section and a second folding section which are sequentially bent and connected, and the end face of the first side edge is opposite to the end face of the second side edge.
Furthermore, a first bending portion is formed between the pre-folding section and the third folding section, a third bending portion is formed between the fourth folding section and the portion, located on the side face of the battery, of the second packaging film, and bonding glue is arranged between the first bending portion and the third bending portion.
Furthermore, the end surface of the first side edge and the end surface of the second side edge are located at a second bending part formed between the third folding section and the fourth folding section.
Furthermore, adhesive glue is arranged between the end face of the first side edge and the end face of the second side edge and the inner side of the second bending part.
Furthermore, the length of the third folding section is 1/3-2/3 of the length of the fourth folding section.
Furthermore, the width difference between the second side edge and the first side edge is greater than or equal to the length of the pre-folding section, and is less than or equal to the sum of the lengths of the pre-folding section and the third folding section.
According to the technical scheme provided by the utility model, the utility model discloses a side on the different packaging film of control cuts the width, set up the side of two packaging films into different width, hem in advance with the great side of width, thereby when carrying out a book and two folds to the side, just can advance the inside of hem structure with the metal terminal surface of two sides through the hem in advance, the metal terminal surface of the side of tightening, make and be separated between the metal terminal surface of side and the packaging film of battery side, the direct and the plastic-aluminum membrane contact of battery side of metal terminal surface of having stopped the side, thereby the condition of the plastic-aluminum membrane of sharp-pointed metal terminal surface damage or impaling the battery side has been avoided and the safety performance of battery has been improved.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, it is obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive efforts.
FIG. 1 is a schematic diagram of a double-folded battery;
fig. 2 is an expanded schematic view of an encapsulation film according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating a second side edge of the embodiment of the present invention being pre-bent;
fig. 4 is a schematic view of the second side and the first side first fold of the embodiment of the present invention;
fig. 5 is a schematic view of a second fold of the second side and the first side of the embodiment of the present invention;
FIG. 6 is a schematic view of a folded edge of another embodiment of a battery according to an embodiment of the present invention;
fig. 7 is a schematic folding view of another embodiment of a battery according to an embodiment of the present invention.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Detailed Description
In the following detailed description of the embodiments of the present invention, the drawings showing the device structure will not be partially enlarged according to the general scale for the convenience of illustration, and the schematic drawings are only examples, which should not limit the scope of the present invention. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for the purpose of facilitating and clearly assisting in the description of the embodiments of the present invention. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "front," "back," "bottom," "upper," "lower," and the like refer to an orientation or positional relationship relative to an orientation or positional relationship shown in the drawings, which is for convenience and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The utility model discloses a battery is soft packet of lithium ion battery of hexahedron shape. For convenience of description, two opposite surfaces where the area of the battery is the largest are defined as a front surface and a rear surface of the battery, respectively, two surfaces perpendicular to the extending direction of the battery tab are defined as a top surface and a bottom surface of the battery, respectively, and the remaining two surfaces are side surfaces of the battery, that is, two surfaces connecting the front surface and the rear surface of the battery in the thickness direction of the battery are side surfaces of the battery. The section formed after the side edge of the packaging film is cut is the end face of the side edge. The side edge of the encapsulation film is folded from the end of the side edge toward the side surface of the cell to form a side edge folding structure, as shown in the dashed frame in fig. 1, which is located outside the side surface of the cell.
As shown in fig. 2 and fig. 5, the encapsulation film (aluminum-plastic film) for encapsulating the battery cell body 4 includes a first encapsulation film 1 and a second encapsulation film 2 that can be covered together, and at least one of the two encapsulation films is stamped to form a pit slot for accommodating the battery cell body, in this embodiment, the two encapsulation films are stamped to form a pit slot for accommodating the battery cell body, where the pit slot formed on the first encapsulation film 1 has a deeper depth, and is a deep pit slot 1a (first pit slot), and the pit slot formed on the second encapsulation film 2 has a shallower depth, and is a shallow pit slot 2a (second pit slot), and when the first encapsulation film 1 and the second encapsulation film 2 are folded together, the deep pit slot 1a and the shallow pit slot 2a jointly form a battery cell accommodating slot for accommodating the battery cell body. The deep pit groove 1a and the shallow pit groove 2a are set correspondingly according to the cell thickness and the aluminum-plastic film thickness, the deep pit groove 1a of the embodiment may have a depth of 3.1mm to 5.0mm, and the shallow pit groove 2a may have a depth of 1.2mm to 2.7mm. In other embodiments, only one of the encapsulation films may be punched, and the other encapsulation film without punching may be a planar structure.
The utility model discloses a be located of first encapsulation membrane 1 and be located dark pot hole 1a (electric core body) outlying side and the second encapsulation membrane 2 be located shallow pot hole 2a (electric core body) outlying side can form the banding after the hot pressing, the utility model discloses a control the side cut width of different encapsulation membrane sides to the cooperation is rolled over the limit technology in advance and is avoided the metal terminal surface damage battery side's of encapsulation membrane side plastic-aluminum membrane. As shown in fig. 2, after trimming, the width w1 of the first side 1b of the first packaging film 1 of the embodiment is smaller than the width w2 of the second side 2b of the second packaging film 2, so that when the first packaging film 1 and the second packaging film 2 are folded and covered together, and the edge is sealed by hot pressing, the second side 2b of the second packaging film 2 extends beyond the first side 1b of the first packaging film 1.
As shown in fig. 3, the portion of the second side edge 2b extending beyond the first side edge 1b is pre-folded, the end of the second side edge 2b is folded inward, i.e., folded toward the end of the first side edge 1b, a pre-folded section 2b-1 is formed on the second side edge 2b after pre-folding, the end surface of the second side edge 2b is opposite to the end surface of the first side edge 1b, and a gap may be left between the end surface of the second side edge 2b and the end surface of the first side edge 1b. The packaging inner layer of the packaging film (aluminum plastic film) of the embodiment is a polypropylene layer, and the PP of the inner layer is fused and reinforced by using an upper and lower double-end-enclosure hot-pressing process after the second side edge 2b is folded in advance.
After pre-flanging, performing first flanging and hot-pressing by adopting a conventional flanging process, and performing first flanging on the first side edge 1b and the second side edge 2b together, as shown in fig. 4, after the first flanging, forming a first flanging section 1b-1 on the first side edge 1b, forming a third flanging section 2b-2 on the second side edge 2b, and wrapping the first flanging section 1b-1 of the first side edge 1b and the pre-flanging section 2b-1 of the second side edge 2b at the inner side of the third flanging section 2b-2 of the second side edge 2 b. As shown in fig. 5, the first side edge 1b and the second side edge 2b are folded for the second time, after the second folding, the first side edge 1b forms a second folded section 1b-2, and the second side edge 2b forms a fourth folded section 2b-3, wherein the first folded section 1b-1 and the second folded section 1b-2 of the first side edge 1b are sequentially connected, the pre-folded section 2b-1 and the third folded section 2b-2 of the second side edge 2b are sequentially connected, the fourth folded section 2b-3 of the second side edge 2b is located at the outermost side (the side farthest from the side surface of the battery) of the folding structure, the third folded section 2b-2 of the second side edge 2b is opposite to the side surface of the battery, and the pre-folded section 2b-1 of the second side edge 2b is located at the side of the third folded section 2b-2 of the second side edge 2b, which is far away from the side surface of the battery.
After each time of flanging, the side edge forms a bent part, for example, after pre-flanging, the second side edge 2b forms a first bent part a between the pre-flanging section 2b-1 and the third bending section 2b-2, and the pre-flanging section 2b-1 and the third bending section 2b-2 are connected by the first bent part a; after the first edge folding, a second bent part b is formed between the third folded section 2b-2 and the fourth folded section 2b-3 by the second side edge 2b and between the first folded section 1b-1 and the second folded section 1b-2 by the first side edge 1b, and the second bent part b is connected with the third folded section 2b-2, the fourth folded section 2b-3, the first folded section 1b-1 and the second folded section 1b-2 by the second bent part b; after the second folding, the second side edge 2b forms a third folded portion c between the fourth folded section 2b-3 and the portion of the second packaging film 2 on the battery side and the first side edge 1b between the second folded section 1b-2 and the portion of the first packaging film 1 on the battery side, and the fourth folded section 2b-3 and the portion of the second packaging film 2 on the battery side and the second folded section 1b-2 and the portion of the first packaging film 1 on the battery side are connected by the third folded portion c.
Because the second side edge 2b is subjected to edge pre-folding, the end face of the pre-folded edge is opposite to the end face of the first side edge 1b, after the first edge folding, the end faces of the two side edges are wrapped in the edge folding structure, and the metal end faces of the two side edges and the aluminum plastic film on the side face of the battery are separated by the third folding section 2b-1 of the second side edge 2b, so that the metal end faces of the side edges cannot be directly contacted with the aluminum plastic film on the side face of the battery, the condition that sharp metal end faces damage or pierce the aluminum plastic film on the side face of the battery is avoided, and the safety performance of the battery is improved.
As an alternative embodiment of the present invention, the adhesive can be dispensed to the edge for reinforcement, and the dispensing position can be set in the gap between the first bending portion a and the third bending portion c, as shown in fig. 5, the gap between the first bending portion a and the third bending portion c is provided with the adhesive 3. The bonding glue can be a reactive polyurethane hot melt adhesive, and the side sealing structure of the battery can be reinforced through the bonding glue.
In this embodiment, the width w2 of the second side edge 2b is equal to the sum of the lengths of the pre-folding section, the third folding section and the fourth folding section, and more specifically, the length of the third folding section of the second side edge 2b may be 1/3 to 2/3 of the length of the fourth folding section. The width w1 of the first side edge 1b is equal to the sum of the length of the first fold segment and the length of the second fold segment. The width difference between the second side edge and the first side edge (the length of the part of the second side edge extending beyond the first side edge) is greater than or equal to the length of the pre-folding edge section of the second side edge, and is less than or equal to the sum of the lengths of the pre-folding edge section of the second side edge and the third folding section. The width difference between the second side edge and the first side edge of the present embodiment is greater than the length of the pre-folding edge section of the second side edge, and is less than the sum of the lengths of the pre-folding edge section and the third folding edge section of the second side edge.
Fig. 6 is a schematic diagram of another embodiment of the present invention. As shown in fig. 6, the difference from the previous embodiment is that the end surfaces of the first side 1b and the second side 2b of the present embodiment are located at the bending point (second bending point b) of the second side 2b when the second side 2b is folded for the first time, so that the stress of the second side 2b when it is folded for the first time can be reduced. In the embodiment, only the second side edge 2b is folded when the first side edge is folded, the first side edge 1b is not folded, and the first side edge 1b only forms a folding section when the second side edge is folded. The difference in width between the second side edge 2b and the first side edge 1b is equal to the sum of the lengths of the pre-folded section 2b-1 and the third folded section 2b-2 of the second side edge 2 b.
Fig. 7 is a schematic diagram of another embodiment of the present invention. As shown in fig. 7, the end surface of the first side 1b and the end surface of the second side 2b are located at the second bent portion b, and a gap is left between the end surfaces and the inner side of the second bent portion b, and the length of the gap is less than 1/2 of the length of the third fold section 2b-2 of the second side 2 b. The bonding glue 3 is arranged at the gap, and the folding edge can be prevented from being opened and turned back due to the bending stress between the third folding section 2b-2 and the fourth folding section 2b-3 of the second side edge 2b after folding, so that the stability of the folding edge structure is improved.
The utility model discloses a hem in advance is carried out to the side that is located the hem structure outside to in one's book and two backs, the terminal surface on both sides limit has all been wrapped into the inside of hem structure, and the metal terminal surface of having stopped the packaging film side completely exposes, and the risk that touches with the packaging film of battery side has improved the security performance of battery. And through some glue, can reduce the too big open risk of hem that leads to of stress of double folds.
Certainly, the technical concept of the present invention is not limited to the above embodiments, and many different specific schemes can be obtained according to the inventive concept, for example, in the foregoing embodiments, the packaging film with the shallow pit groove is pre-hemmed, that is, the packaging film with the shallow pit groove is to be hemmed for three times, but the packaging film with the deep pit groove can be pre-hemmed, so that the end surfaces of the first and second sealing edges are opposite, and after the integral secondary hemmed, the end surfaces of the side edges are all wrapped inside the hemmed structure, so as to prevent the sharp end portions of the side edges from leaking outside, and destroy the aluminum plastic film on the side surface of the battery; such modifications and equivalents are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a battery, includes electric core body and encapsulation membrane of encapsulation electric core body which characterized in that:
the packaging film comprises a first packaging film and a second packaging film, the first packaging film is provided with a first side edge, the second packaging film is provided with a second side edge, and the first side edge and the second side edge are overlapped and bent to form a folded edge;
the width of the first side edge is smaller than that of the second side edge; the first side edge is provided with at least one folding section; the second side edge is provided with a pre-folding section, a third folding section and a fourth folding section which are sequentially bent and connected, the fourth folding section is located on one side of the folded edge, which is farthest away from the side face of the battery, the third folding section is opposite to the side face of the battery, the pre-folding section is located on one side, deviating from the side face of the battery, of the third folding section, the end face of the first side edge is located on the third folding section, and the end face of the second side edge is located between the fourth folding section and the third folding section.
2. The battery of claim 1, wherein: and a first pit groove is formed on the second packaging film, the first packaging film is of a planar structure or a second pit groove corresponding to the first pit groove is formed on the first packaging film, and the depth of the second pit groove is smaller than that of the first pit groove.
3. The battery of claim 2, wherein: the depth of the first pit groove is 3.1 mm-5.0 mm.
4. The battery of claim 2, wherein: the depth of the second pit groove is 1.2 mm-2.7 mm.
5. The battery of claim 1, wherein: the first side edge is provided with a first folding section and a second folding section which are sequentially bent and connected, and the end face of the first side edge is opposite to the end face of the second side edge.
6. The battery of claim 1, wherein: the pre-flanging section and the third folding section form a first bending part therebetween, the fourth folding section and the second packaging film form a third bending part therebetween, and bonding glue is arranged between the first bending part and the third bending part.
7. The battery of claim 1, wherein: the terminal surface of first side with the terminal surface of second side is located third fold section with the second kink department that forms between the fourth fold section.
8. The battery of claim 7, wherein: and adhesive glue is arranged between the end surface of the first side edge and the end surface of the second side edge and the inner side of the second bending part.
9. The battery of claim 1, wherein: the length of the third folding section is 1/3-2/3 of the length of the fourth folding section.
10. The battery of claim 1, wherein: the width difference between the second side edge and the first side edge is larger than or equal to the length of the pre-folding section, and is smaller than or equal to the sum of the lengths of the pre-folding section and the third folding section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221170858.9U CN217544689U (en) | 2022-05-16 | 2022-05-16 | Battery with a battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221170858.9U CN217544689U (en) | 2022-05-16 | 2022-05-16 | Battery with a battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217544689U true CN217544689U (en) | 2022-10-04 |
Family
ID=83435061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221170858.9U Active CN217544689U (en) | 2022-05-16 | 2022-05-16 | Battery with a battery cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217544689U (en) |
-
2022
- 2022-05-16 CN CN202221170858.9U patent/CN217544689U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5420479B2 (en) | Automatic manufacturing method of mask packaging set and mask packaging set | |
| CN202167546U (en) | Square flexibly packaged battery | |
| CN214313347U (en) | Energy density promotes soft-packaged electric core | |
| CN112086585B (en) | Battery cell | |
| JP5676172B2 (en) | Manufacturing method of laminated film exterior laminated battery | |
| CN107444733A (en) | Packaging material | |
| TWI316497B (en) | ||
| JP5082264B2 (en) | Film-clad electrical device and method for manufacturing the same | |
| CN217544689U (en) | Battery with a battery cell | |
| TW201615518A (en) | Film shaped article, film packaged product using the same, method for producing film shaped article, and method for producing film packaged product | |
| CN112117499B (en) | Battery and method for manufacturing battery | |
| CN213150879U (en) | Power battery | |
| TWI515153B (en) | Box for containing rolled film and box with rolled film | |
| CN111244334A (en) | Soft package lithium ion battery and back edge folding process method thereof | |
| JP6344746B2 (en) | Alkaline battery and method for producing alkaline battery | |
| CN111114944A (en) | Composite paper iron box | |
| US20040115528A1 (en) | Electrochemical cells and their packaging | |
| CN111952486A (en) | Display module and preparation method thereof | |
| CN211766925U (en) | Composite paper iron box | |
| CN210853305U (en) | Repeatedly usable's packing carton | |
| JP2015157638A (en) | Package and manufacturing method of the same | |
| CN213401325U (en) | Soft package battery | |
| JP2021012765A (en) | Manufacturing method of bag-shaped separator for secondary battery and device for the same | |
| JP5033444B2 (en) | Cutting blade for die cutting | |
| CN216624337U (en) | Pole piece structure and battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |