CN216085044U - Laminate polymer battery with directional pressure release structure - Google Patents
Laminate polymer battery with directional pressure release structure Download PDFInfo
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- CN216085044U CN216085044U CN202122373695.6U CN202122373695U CN216085044U CN 216085044 U CN216085044 U CN 216085044U CN 202122373695 U CN202122373695 U CN 202122373695U CN 216085044 U CN216085044 U CN 216085044U
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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 utility model discloses a soft package battery with a directional pressure relief structure, which comprises an electric core and an aluminum-plastic film, wherein the aluminum-plastic film is coated on the outer side of the electric core, the aluminum-plastic film is respectively provided with edge seals at the periphery of the electric core, the edge seals comprise a hot-melt bonded heat sealing area and a notch without the aluminum-plastic film, the notch is arranged in the heat sealing area, the edge of the notch and the edge of the heat sealing area are spaced at intervals, or the inner edge of the notch and the inner edge of the heat sealing area are spaced at intervals, and the notch extends to the outer edge of the heat sealing area. The banding after heat-seal is punched through perforating equipment, forms the breach in the banding, because the heat-seal area of this department of banding is less than other regions, and the pressure that can bear is also less than other regions, so when the inside production gas of battery or flame, this department of banding can be taken lead to by the burst, and gas and heat are followed this department and are directionally overflowed.
Description
Technical Field
The utility model relates to the field of batteries, in particular to a soft package battery with a directional pressure relief structure.
Background
At present, lithium batteries can be divided into three types, namely cylindrical batteries, square-shell batteries and soft-package batteries according to appearance structures and shell materials. Except for the soft package battery, the other two batteries are provided with an explosion-proof valve on the shell as a safety device when the battery is in thermal runaway.
The conventional soft package battery is not provided with the setting of an explosion-proof valve, so that abnormal conditions such as short circuit and overcharge can occur in the use process of the soft package battery, and the temperature in the battery can be rapidly increased; the substances of the anode material, the cathode material and the electrolyte are decomposed to release a large amount of heat and gas, the aluminum-plastic film can swell, when the pressure reaches a certain value, the edge sealing of the aluminum-plastic film can be broken to exhaust, the breakage has randomness, the breaking pressure is generally high, and after the lithium ion battery is grouped, the thermal runaway of a battery module is easily caused, the battery is caused to burn and explode, and potential safety hazards are generated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a soft package battery with a directional pressure relief structure, which solves the problem of explosion caused by incapability of directional discharge due to gas expansion in the use process of the soft package battery.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model provides a laminate polymer battery with directional pressure release structure, includes electric core and plastic-aluminum membrane, the plastic-aluminum membrane cladding is in the electric core outside, the plastic-aluminum membrane is equallyd divide all around in electric core and does not be equipped with the banding, the banding includes through hot melt adhesive's heat-seal district and the breach that does not have the plastic-aluminum membrane, the breach is arranged in the heat-seal district, the edge of breach with the equal interval in edge in heat-seal district has the distance, perhaps the inboard edge of breach with the inboard edge interval in heat-seal district has the distance, just the breach extends to the outside edge in heat-seal district.
Preferably, the seal edge comprises a top seal, a bottom seal and side seals respectively located at the left side and the right side of the battery core, and the notch is located in the side seals.
Preferably, when the edge of the notch is spaced from the edge of the heat-seal land, the inner and outer edges of the notch are arranged in parallel.
Preferably, the notch is quadrilateral.
Preferably, the notch is rectangular.
Preferably, the distance between the inner side edge of the notch and the inner side edge of the heat sealing area is 1mm to 5 mm.
Preferably, the distance between the outer edge of the notch and the outer edge of the heat sealing area is 1 mm-5 mm.
Preferably, the distance between the inner edge and the outer edge of the notch is 1 mm-5 mm.
Preferably, the length of the notch accounts for 20% -50% of the length of the side seal edge.
Preferably, the notch is triangular or trapezoidal when the inner edge of the notch is spaced from the inner edge of the heat-sealing region and the notch extends to the outer edge of the heat-sealing region.
Compared with the prior art, the soft package battery with the directional pressure relief structure has the advantages that,
1) after the aluminum-plastic film is subjected to heat sealing, punching is carried out at the edge sealing position by adopting punching equipment, so that a notch is formed in the edge sealing of the heat-sealed battery, and because the heat sealing area of the edge sealing position is smaller than that of other areas and the pressure capable of bearing is also smaller than that of other areas, when gas and flame are generated inside the battery, the edge sealing position can be burst first, and the gas and heat directionally overflow from the position;
2) compared with the installation of a pressure relief valve, the soft package battery with the directional pressure relief structure provided by the utility model can be realized by only adding a punching preparation process in the conventional soft package battery production process without additionally purchasing other parts, so that the economic cost is saved, and the large-scale application is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a pouch battery in this embodiment;
FIG. 2 is a schematic cross-sectional view of a side seal of examples 2 to 11;
FIG. 3 is a schematic cross-sectional view of a side seal of example 12;
FIG. 4 is a schematic cross-sectional view of a side seal of example 13.
In the figure, 1, a cell; 2. an aluminum-plastic film; 21. sealing edges; 211. a heat seal zone; 212. and (4) a notch.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
Examples 1,
The utility model provides a laminate polymer battery with directional pressure release structure, as shown in fig. 1, including electric core 1 and plastic-aluminum membrane 2, the plastic-aluminum membrane 2 cladding is in electric core 1 outside, plastic-aluminum membrane 2 is equipped with banding 21 respectively all around electric core 1, banding 21 includes through hot melt adhesive's heat-seal district 211 and the breach 212 that does not have the plastic-aluminum membrane, the breach 212 is arranged in heat-seal district 211, the edge of breach 212 has the distance with the equal interval in edge of heat-seal district 211, perhaps the inboard edge of breach 212 and the inboard edge interval of heat-seal district 211 have the distance, and the breach 212 extends to the outside edge of heat-seal district 211.
The aluminum-plastic film 2 is provided with the notch 212 in the sealing edge 21, and because the heat-sealing area of the sealing edge 21 is smaller than that of other areas and the pressure which can be borne by the sealing edge 21 is smaller than that of other areas, when high air pressure is generated inside the battery, the sealing edge 21 is burst at first, and the gas overflows from the sealing edge in a directional manner.
The edge sealing 21 is mainly formed by folding and pressing two oppositely arranged heat sealing heads on the aluminum plastic film, and heating to melt and bond the PP layer of the aluminum plastic film. The utility model discloses a soft package battery, wherein a notch 212 is arranged in a sealed edge 21, and the notch is mainly realized by punching holes on a heat-sealed aluminum plastic film 2 by using punching equipment.
The seal edge 21 includes a top seal, a bottom seal and side seals respectively located at the left and right sides of the battery core, and the notch 212 is located in the side seals.
It will be appreciated by those skilled in the art that the notch 212 may also be provided in the top seal or the bottom seal, and that the shape of the notch 212 may be varied, such as: circular, polygonal, etc.
When the edge of the notch 212 is spaced from the edge of the heat-sealing area 211, the inner and outer edges of the notch 212 are parallel, and further, the notch 212 is quadrilateral or even rectangular, which is convenient for the processing of the punching device, and on the other hand, the pressure at the position where the notch 212 is disposed can be the same or similar. Referring to the battery cell 1, the outer edge of the notch 212 extends along the length direction of the sealing edge 21, and is close to one side edge of the outer side surface of the battery cell 1, and the inner side edge of the notch 212 is the side edge opposite to the outer side edge thereof.
In order to better realize the pressure relief effect, the length of the notch 212 accounts for 20% -50% of the side sealing edge length.
When the inner edge of the notch 212 is spaced apart from the inner edge of the heat-sealing region 211 and the notch 212 extends to the outer edge of the heat-sealing region 211, the notch 212 has a triangular or trapezoidal shape.
Examples 2,
A soft package battery with a directional pressure relief structure is shown in a combined drawing 1-2 and comprises a battery cell 1, wherein a notch 212 is arranged in at least one side seal of the left side and the right side of the battery cell 1, and the notch 212 is rectangular.
When packaging, the heat sealing head is pressed on the aluminum plastic film, the heat sealing temperature is 180 ℃, the pressure applied during heat sealing is 0.3MPa, the heat sealing time is 4s, the width of the side seal is 6mm, a punching device is used for punching a notch 212 in the middle of the sealing edge 21, the distance a between the inner edge and the outer edge of the notch 212 is 1mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 1mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 4mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Examples 3,
The present embodiment is different from embodiment 2 in that the width of the side seal is 6mm, the distance a between the inner and outer edges of the notch 212 is 1mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 3mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 2mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Examples 4,
The present embodiment is different from embodiment 2 in that the width of the side seal is 6mm, the distance a between the inner and outer edges of the notch 212 is 2mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 3mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 1mm, and the length d of the notch 212 in the length direction of the side seal is 5 cm.
Examples 5,
The present embodiment is different from embodiment 2 in that the width of the side seal is 6mm, the distance a between the inner and outer edges of the notch 212 is 2mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 2mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 2mm, and the length d of the notch 212 in the length direction of the side seal is 15 cm.
Examples 6,
The present embodiment is different from embodiment 2 in that the width of the side seal is 6mm, the distance a between the inner and outer edges of the notch 212 is 3mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 2mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 1mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Example 7,
The present embodiment is different from embodiment 2 in that the width of the side seal is 6mm, the distance a between the inner and outer edges of the notch 212 is 4mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 1mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 1mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Example 8,
The present embodiment is different from embodiment 2 in that the width of the side seal is 7mm, the distance a between the inner and outer edges of the notch 212 is 1mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 3mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 3mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Examples 9,
The present embodiment is different from embodiment 2 in that the width of the side seal is 7mm, the distance a between the inner and outer edges of the notch 212 is 1mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 5mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 1mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Examples 10,
The present embodiment is different from embodiment 2 in that the width of the side seal is 7mm, the distance a between the inner and outer edges of the notch 212 is 1mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 1mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 5mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Examples 11,
The present embodiment is different from embodiment 2 in that the width of the side seal is 7mm, the distance a between the inner and outer edges of the notch 212 is 5mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 1mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 1mm, and the length d of the notch 212 in the length direction of the side seal is 10 cm.
Examples 12,
As shown in fig. 3, this embodiment is different from embodiment 2 in that two notches 212 are provided, the width of the side seal is 7mm, the distance a between the inner and outer edges of the notch 212 is 5mm, the distance b between the inner edge of the notch 212 and the inner edge of the side seal is 1mm, the distance c between the outer edge of the notch 212 and the outer edge of the side seal is 1mm, the length d of the notch 212 in the length direction of the side seal is 1cm, and the two notches 212 are arranged in the length direction of the side seal and spaced by 1 mm.
Examples 13,
A pouch battery with directional pressure relief structure, as shown in fig. 4, this embodiment is different from embodiment 2 in that the width of the side seal is 7mm, the notch 212 is triangular, one corner of the triangle faces the inner edge of the seal 21, and the length of the notch 212 along the length direction of the side seal is 10 cm.
Comparative example 1, conventional laminate polymer battery, normal banding design, the banding width of side seal is 6 mm.
The pouch batteries of examples 2 to 13 were subjected to an overcharge test at 5-fold voltage or 5-fold capacity to check whether or not the directional relief could be achieved, while heat-seal bars were made with reference to the pouch batteries of examples 2 to 13 described above, and heat-seal strength test was performed at a tensile rate of 50mm/min, with the test results shown in the following table.
The method comprises the steps of carrying out an overcharge test under 5 times of voltage or 5 times of capacity on the soft package battery of the comparative example 1, meanwhile, making a heat-seal sample bar according to the soft package battery of the comparative example 1, and carrying out a heat-seal strength test, wherein the obtained result is that the sealing edge of the soft package battery of the comparative example 1 is randomly broken, and the heat-seal strength value is 15.1N/mm, and comparing the above table, it can be known that the soft package battery with the directional pressure relief structure disclosed by the utility model punches the heat-sealed sealing edge 21 through punching equipment, so that a notch 212 is formed in the sealed battery sealing edge 21, and because the heat-seal area of the sealing edge 21 is smaller than other areas, the pressure which can be borne by the sealing edge 21 is also smaller than other areas, when high air pressure is generated in the battery, the sealing edge 21 is firstly burst, and the gas directionally overflows from the sealing edge. And when the breach 212 area of design is less, can realize suitable encapsulation intensity through a plurality of breachs 212 that the interval set up, effectively solved gaseous because of unable exhaust and lead to the problem of explosion.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a laminate polymer battery with directional pressure release structure, includes electric core (1) and plastic-aluminum membrane (2), the cladding of plastic-aluminum membrane (2) is in electric core (1) outside, its characterized in that: aluminium-plastic membrane (2) equally divide all around electric core (1) and do not be equipped with banding (21), banding (21) include through hot melt adhesive's heat-seal district (211) and breach (212) that do not have the aluminium-plastic membrane, breach (212) are arranged in heat-seal district (211), the edge of breach (212) with the equal interval in edge of heat-seal district (211) has the distance, perhaps the inboard edge of breach (212) with the inboard edge interval of heat-seal district (211) has the distance, just breach (212) extend to the outside edge in heat-seal district (211).
2. The pouch cell with directional pressure relief structure according to claim 1, wherein: the seal edge (21) comprises a top seal, a bottom seal and side seals respectively positioned at the left side and the right side of the battery core, and the notch (212) is positioned in the side seals.
3. The pouch cell with directional pressure relief structure according to claim 1, wherein: when the edge of the notch (212) and the edge of the heat sealing area (211) are both spaced at a distance, the inner edge and the outer edge of the notch (212) are arranged in parallel.
4. The pouch cell with directional pressure relief structure according to claim 3, wherein: the notch (212) is quadrilateral.
5. The pouch battery with directional pressure relief structure according to claim 4, wherein: the notch (212) is rectangular.
6. The pouch cell with directional pressure relief structure according to any of claims 3-5, wherein: the distance between the inner side edge of the notch (212) and the inner side edge of the heat sealing area (211) is 1-5 mm.
7. The pouch cell with directional pressure relief structure according to any of claims 3-5, wherein: the distance between the outer edge of the notch (212) and the outer edge of the heat sealing area (211) is 1-5 mm.
8. The pouch cell with directional pressure relief structure according to any of claims 3-5, wherein: the distance between the inner edge and the outer edge of the notch (212) is 1 mm-5 mm.
9. The pouch cell with directional pressure relief structure according to claim 8, wherein: the length of the notch (212) accounts for 20% -50% of the length of the side seal edge.
10. The pouch cell with directional pressure relief structure according to claim 2, wherein: when the inner side edge of the notch (212) is spaced from the inner side edge of the heat sealing area (211) and the notch (212) extends to the outer side edge of the heat sealing area (211), the notch (212) is triangular or trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122373695.6U CN216085044U (en) | 2021-09-28 | 2021-09-28 | Laminate polymer battery with directional pressure release structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122373695.6U CN216085044U (en) | 2021-09-28 | 2021-09-28 | Laminate polymer battery with directional pressure release structure |
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| CN216085044U true CN216085044U (en) | 2022-03-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114899537A (en) * | 2022-06-06 | 2022-08-12 | 昆山华誉自动化科技有限公司 | Soft package lithium battery aluminum plastic film heat sealing method and soft package lithium battery structure |
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2021
- 2021-09-28 CN CN202122373695.6U patent/CN216085044U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114899537A (en) * | 2022-06-06 | 2022-08-12 | 昆山华誉自动化科技有限公司 | Soft package lithium battery aluminum plastic film heat sealing method and soft package lithium battery structure |
| CN114899537B (en) * | 2022-06-06 | 2023-09-01 | 昆山华誉自动化科技有限公司 | Soft package lithium battery aluminum plastic film heat sealing method and soft package lithium battery structure |
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