CN109755437B - Explosion-proof structure of battery and explosion-proof cover plate of battery applying explosion-proof structure of battery - Google Patents
Explosion-proof structure of battery and explosion-proof cover plate of battery applying explosion-proof structure of battery Download PDFInfo
- Publication number
- CN109755437B CN109755437B CN201711093711.8A CN201711093711A CN109755437B CN 109755437 B CN109755437 B CN 109755437B CN 201711093711 A CN201711093711 A CN 201711093711A CN 109755437 B CN109755437 B CN 109755437B
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- Prior art keywords
- explosion
- proof
- battery
- hole
- liquid injection
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- 239000007788 liquid Substances 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 46
- 239000007924 injection Substances 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000004880 explosion Methods 0.000 claims description 5
- 241000587161 Gomphocarpus Species 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 abstract description 14
- 239000003292 glue Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000755266 Kathetostoma giganteum Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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
Abstract
The invention discloses a battery explosion-proof structure and a battery explosion-proof cover plate applying the same, belonging to the field of power batteries; the sealing piece blocks the liquid injection hole; the explosion-proof hole is arranged on the liquid injection hole; the explosion-proof piece is arranged in the explosion-proof hole; the battery explosion-proof structure is arranged on the battery explosion-proof cover plate. According to the invention, the liquid injection hole is designed to be of a counter bore structure, and the explosion-proof hole is arranged on the liquid injection hole, so that the hole position of the battery is reduced; the explosion-proof sheet is arranged in the explosion-proof hole, steel balls are not required to be pressed into the liquid injection hole, the process flow is simplified, and the labor and material cost is reduced; in the formation process, glue nails are inserted into the liquid injection holes, after formation, the glue nails are pulled out, and then the explosion-proof sheet is welded, so that the explosion-proof sheet can be prevented from being polluted by electrolyte in the welding process; the problem of power battery's notes liquid hole and explosion-proof hole need separate set up and at notes liquid hole site make-up steel ball of pressing because of influence its leakproofness along with the battery vibrations and lead to the unstable performance is solved.
Description
[ field of technology ]
The invention relates to the field of power batteries, in particular to a battery explosion-proof structure and a battery explosion-proof cover plate applying the same.
[ background Art ]
The power battery has the advantages of small volume, light weight, strong electric quantity, no memory, green environmental protection and the like, and is widely used as a storage battery of an electric automobile, an electric bicycle, an electric train, a golf cart and the like.
In order to safely use the power battery, the power battery is provided with explosion-proof holes, and the liquid injection hole and the explosion-proof hole of the existing power battery are separately arranged, so that the process is complex; in order to ensure the tightness of the battery core, the battery core needs to supplement and press the steel balls at the liquid injection hole position after formation is completed, but the steel balls influence the tightness of the battery along with vibration of the battery, and the performance is unstable.
[ invention ]
In order to solve the problems, the invention provides a battery explosion-proof structure with simple structure and good effect and a battery explosion-proof cover plate using the battery explosion-proof structure.
The technical scheme adopted by the invention is as follows: a battery explosion-proof structure comprises a liquid injection hole, a sealing piece, an explosion-proof hole and an explosion-proof piece; the sealing piece blocks the liquid injection hole to seal the battery to prevent electrolyte in the battery from leaking out; the explosion-proof hole is arranged on the liquid injection hole; the explosion-proof piece is arranged in the explosion-proof hole.
In the technical scheme, the explosion-proof hole and the liquid injection hole are stacked up and down so as to reduce hole sites of batteries and optimize the process flow; the explosion-proof hole is located at one side far away from the battery inner core so as to avoid being stained by electrolyte.
In the technical scheme, the explosion-proof structure is a counter bore structure, the explosion-proof hole is formed in the upper portion of the counter bore, and the liquid injection hole is formed in the lower portion of the counter bore, so that the counter bore structure is machined in advance, the working procedure is simplified, and the production efficiency is improved.
In the above technical solution, the explosion-proof hole is circular, and the liquid injection hole is circular; the explosion-proof hole and the liquid injection hole are coaxial to balance the pressure born by the explosion-proof structure when the internal pressure of the battery is increased; the diameter of the explosion-proof hole is larger than that of the liquid injection hole, so that the explosion-proof piece is arranged.
In the technical scheme, the center of the explosion-proof piece protrudes towards the outer surface of the battery so as to bear the pressure increased by gas expansion in the battery.
In the above technical scheme, the explosion-proof piece is fixedly connected with the explosion-proof hole through laser spot welding, so that when the internal pressure of the battery exceeds a pressure threshold value, the explosion-proof piece is separated from the explosion-proof hole to decompress and avoid explosion of the battery.
In the technical scheme, the welding plane of the explosion-proof sheet and the explosion-proof hole is a flat plane so as to improve the welding effect and the sealing performance.
In the above technical solution, the sealing member is a glue nail to seal the battery and prevent the electrolyte inside the battery from leaking.
In the technical scheme, the front end of the sealing piece is inserted into the liquid injection hole to play a role in sealing; the rear end of the sealing element is an arc-shaped nail head, and the rear end of the sealing element is 5 to 8 millimeters higher than the upper edge of the explosion-proof hole, so that the insertion and extraction actions of the sealing element are convenient for mechanical operation and manual operation.
The battery explosion-proof cover plate comprises the battery explosion-proof cover plate and any battery explosion-proof structure, wherein the battery explosion-proof structure is arranged on the battery explosion-proof cover plate.
The beneficial effects of the invention are as follows: redundant space exists in the power battery structure, the liquid injection hole can be designed into a counter bore structure, and the explosion-proof hole is arranged on the liquid injection hole, so that the hole position of the battery is reduced; the explosion-proof sheet is arranged in the explosion-proof hole, steel balls are not required to be pressed into the liquid injection hole, the process flow is simplified, and the labor and material cost is reduced; the glue nails are inserted into the liquid injection holes in the formation process, and after the formation is completed, the glue nails are pulled out and then the explosion-proof piece is welded, so that the explosion-proof piece is prevented from being polluted by electrolyte in the welding process to damage the whole battery.
[ description of the drawings ]
FIG. 1 is an assembled schematic view of a battery explosion-proof structure;
FIG. 2 is a schematic diagram of a chemical process seal of a battery explosion-proof structure;
FIG. 3 is a top view of a battery explosion-proof structure;
fig. 4 is a front view of a battery explosion-proof structure;
fig. 5 is a perspective view of an explosion-proof structure of a battery;
FIG. 6 is a front view of a rupture disc;
FIG. 7 is a top view of a rupture disc;
fig. 8 is a perspective view of a rupture disc.
The reference numerals are: 1. a liquid injection hole; 2. a seal; 3. explosion-proof holes; 4. explosion-proof sheet.
[ detailed description ] of the invention
In order to further explain the above objects, technical solutions and effects of the present invention, the present invention will be described below by way of examples with reference to the accompanying drawings and related well-known technical knowledge:
as shown in fig. 1, a battery explosion-proof structure is provided with a liquid injection hole 1, a sealing piece 2, an explosion-proof hole 3 and an explosion-proof sheet 4; the sealing piece 2 blocks the liquid injection hole 1 to seal the battery to prevent electrolyte inside the battery from leaking out; the explosion-proof structure is arranged on the liquid injection hole 1, so that the hole positions of the battery can be reduced; the explosion-proof sheet 4 is arranged in the explosion-proof hole 3.
As shown in fig. 3 and 4, the explosion-proof hole 3 and the liquid injection hole 1 are stacked up and down to reduce the hole site of the battery and optimize the process flow; the explosion-proof hole 3 is positioned at one side far away from the battery inner core so as to avoid being stained by electrolyte. The explosion-proof structure is a counter bore structure, the explosion-proof hole 3 is arranged at the upper part of the counter bore, and the liquid injection hole 1 is arranged at the lower part of the counter bore, so that the counter bore structure is processed in advance, the working procedure is simplified, and the production efficiency is improved. The explosion-proof hole 3 is circular, the liquid injection hole 1 is circular, and the explosion-proof hole 3 and the liquid injection hole 1 are coaxial to balance the pressure born by the explosion-proof structure when the internal pressure of the battery is increased; the diameter of the explosion-proof hole 3 is larger than that of the liquid injection hole 1 so as to facilitate the arrangement of an explosion-proof piece.
As shown in fig. 6 to 8, the explosion-proof sheet 4 is circular, and the diameter of the explosion-proof sheet 4 is the same as the diameter of the explosion-proof hole 3, so that the installation is convenient; the center of the explosion-proof piece 4 protrudes towards the outer surface of the battery to bear the pressure increased by gas expansion in the battery; the highest plane of the convex surface of the explosion-proof sheet 4 is positioned 1-2 mm below the plane of the cover plate, so that the explosion-proof sheet 4 is prevented from being damaged due to the action of external force. The explosion-proof piece 4 is fixedly connected with the explosion-proof hole 3 through laser spot welding, so that when the internal pressure of the battery exceeds a pressure threshold value, the explosion-proof piece 4 is separated from the explosion-proof hole 3 to decompress, and explosion of the battery is avoided. The welding plane of the explosion-proof sheet 4 and the explosion-proof hole 3 is a flat plane so as to improve the welding effect and the sealing performance.
As shown in fig. 2, the front end of the sealing element 2 is inserted into the liquid injection hole to play a sealing role; the rear end of the sealing element 2 is an arc-shaped nail head, and the rear end of the sealing element 2 is 5 to 8 millimeters higher than the upper edge of the explosion-proof hole, so that the insertion and extraction actions of the sealing element are convenient for mechanical operation and manual operation. The sealing member 2 is a glue nail to seal the battery and prevent electrolyte inside the battery from leaking out. The rubber nail is made of anti-corrosion composite rubber material, so that damage caused by contact with electrolyte is avoided, and the rubber nail can be recycled.
As shown in fig. 5, a battery explosion-proof cover plate comprises the battery explosion-proof cover plate and the battery explosion-proof structure, wherein the battery explosion-proof structure is arranged on the battery explosion-proof cover plate. The battery explosion-proof cover plate can be arranged on any power battery, and the shape of the battery explosion-proof cover plate can be round or square and the like according to the matched power battery.
The specific installation structure and the processing procedure of the embodiment are as follows: as shown in fig. 1 and 4, a counter bore structure is required to be machined in advance on the battery explosion-proof cover plate, a through hole is drilled on the battery explosion-proof cover plate by a drill bit, a counter bore is machined in the upper portion of the through hole by a flat-head drill with the diameter larger than that of the through hole, and the counter bore is coaxial with the through hole. The lower part of the counter bore structure is provided with a liquid injection hole 1, and the upper part of the counter bore structure is provided with an explosion-proof hole 3. The battery explosion-proof cover plate is arranged on the aluminum shell power battery, and the edge of the battery explosion-proof cover plate is welded with the battery shell in a sealing way.
Electrolyte is injected into the battery through the liquid injection hole 1, the counter bore is cleaned after the liquid injection is finished, the inner wall of the counter bore is kept clean, and the glue nail matched with the liquid injection hole 1 is inserted for sealing, so that the air tightness of the battery is ensured, and the electrolyte is prevented from exuding. The rubber nails are made of anti-corrosion composite rubber materials, so that damage caused by contact with electrolyte is avoided, and the rubber nails can be recycled; the front end of the glue nail can tightly block the liquid injection hole 1 after being inserted into the liquid injection hole 1 to prevent electrolyte from flowing out; the rear end of the glue nail is an arc-shaped nail head, and the rear end of the glue nail is 5 to 8 millimeters higher than the upper plane of the cover plate, so that the insertion and extraction actions of the glue nail are convenient for mechanical operation and manual operation.
Before formation, the glue nails are required to be pulled out, and then the battery is placed into a battery formation device for formation; during formation, the rubber nozzle of the vacuum tube is aligned to the liquid injection hole for formation, and the plane of the rubber nozzle and the cover plate play a role in sealing under the action of the air cylinder; after the formation is completed, the liquid injection hole is cleaned again, and then the glue nail is reinserted to seal the battery.
The welding plane of the explosion-proof sheet 4 and the explosion-proof hole 3 is a flat plane, after formation, laser cleaning or plasma cleaning can be added to the explosion-proof sheet 4 and the explosion-proof hole 3, and electrolyte stains and other impurities on the welding plane can be eliminated. And the explosion-proof sheet 4 is welded on the explosion-proof hole 3 by using a continuous light-emitting laser welding machine, and a low humidity condition is required to be maintained during welding so as to improve the welding effect. The highest plane of the convex surface of the explosion-proof sheet 4 is positioned 1-2 mm below the plane of the cover plate, so that the explosion-proof sheet 4 is prevented from being damaged due to the action of external force. The corresponding number of welds is determined based on the desired pressure relief limit of the battery. And the helium leak detection total inspection is added after welding, so that the gas tightness reliability of the welded battery cell can be ensured to ensure the electrical performance of the battery.
The foregoing examples are provided for the purpose of illustration only and are not intended to be limiting, and all equivalent changes or modifications made by the method described in the claims are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a battery explosion-proof structure which characterized in that: the anti-explosion device comprises a liquid injection hole, a sealing piece, an anti-explosion hole and an anti-explosion piece; the explosion-proof structure is a counter bore structure, the explosion-proof hole is arranged at the upper part of the counter bore and is positioned at one side far away from the battery inner core, the liquid injection hole is arranged at the lower part of the counter bore, the sealing piece blocks the liquid injection hole, the explosion-proof piece is arranged in the explosion-proof hole, the central position of the explosion-proof piece protrudes towards the outer surface direction of the battery, and the highest plane of the convex surface of the explosion-proof piece is positioned 1-2 mm below the upper surface of the counter bore structure;
the explosion-proof hole is round, and the liquid injection hole is round; the explosion-proof hole is coaxial with the liquid injection hole, and the diameter of the explosion-proof hole is larger than that of the liquid injection hole.
2. The battery explosion-proof structure according to claim 1, wherein: the explosion-proof piece is fixedly connected with the explosion-proof hole through laser spot welding.
3. The battery explosion-proof structure according to claim 2, wherein: the welding plane of the explosion-proof sheet and the explosion-proof hole is a flat plane.
4. The battery explosion-proof structure according to claim 1, wherein: the sealing element is a rubber nail.
5. A battery explosion-proof structure according to claim 1 or 4, characterized in that: the front end of the sealing element is inserted into the liquid injection hole, the rear end of the sealing element is an arc-shaped nail head, and the rear end of the sealing element is 5 to 8 millimeters higher than the upper edge of the explosion-proof hole.
6. The utility model provides a battery explosion-proof apron which characterized in that: comprising a battery explosion-proof cover plate and a battery explosion-proof structure according to any one of claims 1-5, said battery explosion-proof structure being arranged on said battery explosion-proof cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711093711.8A CN109755437B (en) | 2017-11-08 | 2017-11-08 | Explosion-proof structure of battery and explosion-proof cover plate of battery applying explosion-proof structure of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711093711.8A CN109755437B (en) | 2017-11-08 | 2017-11-08 | Explosion-proof structure of battery and explosion-proof cover plate of battery applying explosion-proof structure of battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109755437A CN109755437A (en) | 2019-05-14 |
| CN109755437B true CN109755437B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711093711.8A Active CN109755437B (en) | 2017-11-08 | 2017-11-08 | Explosion-proof structure of battery and explosion-proof cover plate of battery applying explosion-proof structure of battery |
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| Country | Link |
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| CN (1) | CN109755437B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381119B (en) * | 2021-06-10 | 2022-08-12 | 湖北亿纬动力有限公司 | Battery manufacturing method and battery |
| CN114284631A (en) * | 2021-12-09 | 2022-04-05 | 江苏恒驰动力科技有限公司 | Battery shell with explosion-proof pressure relief function and setting method of explosion-proof sheet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2729909Y (en) * | 2004-09-30 | 2005-09-28 | 河南环宇集团有限公司 | Explosion-proof device for square secondary battery and square secondary battery with the device |
| CN203367409U (en) * | 2013-06-08 | 2013-12-25 | 天津力神电池股份有限公司 | Sealant-nail type power lithium battery adopting liquid injection hole structure |
| CN207441830U (en) * | 2017-11-08 | 2018-06-01 | 银隆新能源股份有限公司 | A kind of battery anti-explosion cover board of battery anti-explosion structure and application the battery anti-explosion structure |
-
2017
- 2017-11-08 CN CN201711093711.8A patent/CN109755437B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2729909Y (en) * | 2004-09-30 | 2005-09-28 | 河南环宇集团有限公司 | Explosion-proof device for square secondary battery and square secondary battery with the device |
| CN203367409U (en) * | 2013-06-08 | 2013-12-25 | 天津力神电池股份有限公司 | Sealant-nail type power lithium battery adopting liquid injection hole structure |
| CN207441830U (en) * | 2017-11-08 | 2018-06-01 | 银隆新能源股份有限公司 | A kind of battery anti-explosion cover board of battery anti-explosion structure and application the battery anti-explosion structure |
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| Publication number | Publication date |
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| CN109755437A (en) | 2019-05-14 |
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