CN220358269U - Top cap subassembly, secondary cell and battery package - Google Patents
Top cap subassembly, secondary cell and battery package Download PDFInfo
- Publication number
- CN220358269U CN220358269U CN202321020195.7U CN202321020195U CN220358269U CN 220358269 U CN220358269 U CN 220358269U CN 202321020195 U CN202321020195 U CN 202321020195U CN 220358269 U CN220358269 U CN 220358269U
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- Prior art keywords
- explosion
- cover plate
- proof valve
- buffer groove
- proof
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- 230000035882 stress Effects 0.000 abstract description 17
- 230000006355 external stress Effects 0.000 abstract description 12
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000004880 explosion Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000029058 respiratory gaseous exchange Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 206010011906 Death Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution 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
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses a top cap assembly, a secondary battery and a battery pack. The top cover assembly comprises a cover plate and an explosion-proof valve embedded on the cover plate, wherein a buffer groove is formed in the cover plate and surrounds the explosion-proof valve. According to the utility model, the buffer groove is formed around the explosion-proof valve on the cover plate, the thickness of the cover plate at the buffer groove is small, compared with other parts, the cover plate is weak, when the battery cell breathes, a part of stress can be born together with the explosion-proof piece, the fatigue attenuation degree of the strength of the explosion-proof piece is reduced, and simultaneously, when the cover plate is subjected to external stress, the buffer groove can absorb deformation or deform preferentially, the influence on the explosion-proof piece of the explosion-proof valve is reduced, and the function of the explosion-proof valve is still reliable under the condition that the top cover component is subjected to external force.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a top cover assembly, a secondary battery and a battery pack.
Background
The battery top cover plate is provided with a pressure relief hole in a penetrating mode, the explosion-proof valve is fixed in the pressure relief hole and comprises an explosion-proof piece with a notch, the explosion-proof piece is welded in the pressure relief hole, and the explosion-proof piece is used as a weak area of the battery core structure. When the battery cell is abnormal, the explosion-proof sheet and the whole explosion-proof valve are broken through by internal gas production, so that pressure is released in time, the explosion of the battery cell is prevented, and the thermal runaway risk is reduced.
The internal air pressure of the battery cell is continuously increased and reduced along with the charge and discharge process and periodically changes, and the breathing action acts on the explosion-proof sheet to cause the fatigue attenuation of the strength of the explosion-proof sheet, so that the explosion pressure of the explosion-proof valve is gradually attenuated along with the breathing action and the service life of the explosion-proof valve is influenced. Meanwhile, in the use process of the battery, the top cover plate has a certain probability of being impacted, when the top cover plate is slightly impacted and deformed, the explosion-proof piece can be pulled, so that the explosion-proof piece cannot maintain the designed explosion pressure, the function is invalid, and the battery is scrapped.
Disclosure of Invention
In view of this, the present utility model provides a top cap assembly, a secondary battery, and a battery pack. The buffer groove is formed in the periphery of the explosion-proof valve on the cover plate, the thickness of the cover plate at the buffer groove is small, compared with other parts, the buffer groove is weak, when the battery cell breathes, a part of stress can be born together with the explosion-proof piece, the fatigue attenuation degree of the strength of the explosion-proof piece is reduced, meanwhile, when the cover plate is subjected to external stress, the cover plate at the buffer groove can absorb deformation or deform preferentially, the influence on the explosion-proof piece of the explosion-proof valve is reduced, and the function of the explosion-proof valve is still reliable under the condition that the top cover component is subjected to external force.
The top cover assembly comprises a cover plate and an explosion-proof valve embedded on the cover plate, wherein a buffer groove is formed in the cover plate and surrounds the explosion-proof valve.
Optionally, the side wall of the buffer groove, which is close to the explosion-proof valve, is provided with an inclined surface; or/and the side wall of the buffer groove far away from the explosion-proof valve is provided with an inclined plane.
Optionally, the buffer tank is close to and keeps away from the lateral wall of explosion-proof valve all sets up to vertical face, and the one end that keeps away from the notch extends the inclined plane relatively towards the notch direction respectively.
Optionally, the width of the buffer groove ranges from 0.5 mm to 3mm.
Optionally, the distance between the side wall of the buffer groove, which is close to the explosion-proof valve, and the explosion-proof valve is 2-20mm.
Optionally, the thickness of the cover plate at the buffer slot is greater than 0.2mm.
Optionally, the buffer grooves are respectively formed in corresponding positions of the surfaces of the two opposite sides of the cover plate.
Optionally, the buffer groove and the cover plate are integrally formed.
The utility model also provides a secondary battery comprising the top cap assembly according to any one of the above.
The utility model also provides a battery pack comprising the secondary battery.
Compared with the prior art, the technical scheme provided by the utility model has at least the following beneficial effects:
by adopting the top cover assembly, the secondary battery and the battery pack, the buffer groove is formed in the periphery of the explosion-proof valve on the cover plate, the cover plate at the buffer groove is small in thickness and weak compared with other parts, and can bear part of stress together with the explosion-proof plate when the battery cell breathes, so that the fatigue attenuation degree of the strength of the explosion-proof plate is reduced, and meanwhile, when the cover plate is subjected to external stress, the buffer groove can absorb deformation or deform preferentially, the influence on the explosion-proof plate of the explosion-proof valve is reduced, and the function of the explosion-proof valve is still reliable under the condition that the top cover assembly is subjected to external force.
Drawings
FIG. 1 is a schematic view of a header assembly according to one embodiment of the present utility model;
FIG. 2 is a sectional view of the cap assembly of FIG. 1 at position A-A;
fig. 3 is a cross-sectional view of a cap assembly according to another embodiment of the present utility model.
Reference numerals:
1: a cover plate; 2: an explosion-proof valve; 21: explosion-proof sheet; 22: a protective sheet; 3: a buffer tank; 4: a positive electrode terminal; 5: a negative electrode terminal; 6: and a liquid injection hole.
Detailed Description
Specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.
It is to be readily understood that, according to the technical solutions of the present utility model, those skilled in the art may replace various structural modes and implementation modes with each other without changing the true spirit of the present utility model. Accordingly, the following detailed description and drawings are merely illustrative of the utility model and are not intended to be exhaustive or to limit the utility model to the precise form disclosed.
Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.
FIG. 1 is a schematic view of a header assembly according to one embodiment of the present utility model; FIG. 2 is a sectional view of the cap assembly of FIG. 1 at position A-A; fig. 3 is a cross-sectional view of a cap assembly according to another embodiment of the present utility model. As shown in fig. 1-3, the top cover assembly comprises a cover plate 1 and an explosion-proof valve 2 embedded on the cover plate 1, a buffer groove 3 is formed in the cover plate 1, and the buffer groove 3 is arranged around the explosion-proof valve 2.
The top cover assembly is covered on the battery shell, the battery core is surrounded, in the process that the air pressure in the battery core is continuously increased and reduced along with the charge and discharge process and is periodically changed, the weaker explosion-proof valve area is acted by the air pressure which is periodically changed and periodically deformed and recovered, a certain degree of fatigue attenuation is generated, meanwhile, the cover plate 1 at the buffer tank 3 is thinned due to the existence of the buffer tank, the other areas of the cover plate 1 are relatively weak, in the process that the air pressure in the battery core is periodically changed, a part of stress is born instead of the explosion-proof valve 2, and a certain degree of deformation and recovery are also periodically generated and dispersed, so that the fatigue attenuation degree of the explosion-proof valve 2 is reduced. When the cover plate 1 near the buffer tank 3 receives external stress, the buffer tank 3 is deformed preferentially due to the thinner thickness, so that excessive stress is not transmitted to the explosion-proof valve 2 continuously, the explosion-proof sheet 21 of the explosion-proof valve 2 receives smaller stress, and the whole explosion-proof sheet is still in a plane, so that the explosion function is not affected. When the cover plate 1 is subjected to external stress at a position away from the buffer tank 3, the buffer tank 3 absorbs the stress generation Xu Xingbian so that the stress is hardly transmitted to the explosion-proof valve 2, thereby having less influence on the explosion-proof sheet 21 of the explosion-proof valve 2.
By adopting the top cover assembly, the buffer groove 3 is formed around the explosion-proof valve 2 on the cover plate 1, the cover plate 1 at the buffer groove 3 is small in thickness and weaker than other parts, and can bear part of stress together with the explosion-proof sheet 21 of the explosion-proof valve 2 when the battery cell breathes, so that the strength fatigue attenuation degree of the explosion-proof sheet is reduced, and simultaneously, when the cover plate 1 is subjected to external stress, the buffer groove 3 can absorb deformation or deform preferentially, the influence on the explosion-proof sheet 21 of the explosion-proof valve 2 is reduced, and the function of the explosion-proof valve 2 is still reliable under the condition that the top cover assembly is subjected to external force is ensured.
In this embodiment, as shown in fig. 1-3, a pressure relief hole is formed in the central position of the cover plate 1, the explosion-proof valve 2 is fixed in the pressure relief hole, and the left and right ends of the cover plate 1 are respectively fixed with a positive terminal 4 and a negative terminal 5, and are provided with a liquid injection hole 6. The explosion-proof valve 2 comprises an explosion-proof sheet 21 and a protection sheet 22 covering the explosion-proof sheet 21, wherein the explosion-proof sheet 21 faces towards the inside of the battery cell, scores are carved on the explosion-proof sheet, and the protection sheet 22 faces away from the inside of the battery cell. As shown in fig. 1, the explosion-proof sheet 21 is in an oval shape as a whole, the buffer slot 3 is closed around the explosion-proof sheet 21, and is also in an oval shape as a whole, and as shown in fig. 2 and 3, the thickness of the cover plate 1 at the buffer slot 3 is reduced compared with other positions, and the cover plate becomes a weaker area. According to practical application, the specific shape, width, depth, perimeter and other dimensions of the buffer tank 3 can be adjusted, the buffer tank 3 can be formed by adopting any manufacturing process, as long as the buffer tank 3 is closed around the explosion-proof valve 2, the cover plate 1 at the buffer tank 3 can absorb the internal and external stress of the battery core, reduce the stress born by the explosion-proof valve 2, maintain sufficient strength, and can be kept intact when the explosion-proof valve 2 is exploded and depressurized due to abnormal internal pressure of the battery core.
During normal use of the battery cell, the burst pressure of the explosion-proof valve 2 gradually decays along with respiration, and the initial pressure of the explosion-proof sheet 21 is designed to be higher than the internal air pressure of the battery cell in consideration of the end-of-life burst pressure. Meanwhile, the internal pressure is rapidly increased under the condition of abnormal battery cells, the explosion-proof sheet 21 can be timely decompressed, more serious consequences are avoided, and the earlier the decompression is, the higher the safety is. Both of these conditions together determine the designable interval of the relief pressure of the explosion proof valve 2. By adopting the battery top cover plate, the cover plate 1 at the buffer groove 3 shares the stress born by the explosion-proof valve 2, so that the initial design pressure interval of the explosion-proof piece is widened, and the safety performance of the battery core is improved.
Optionally, the buffer groove 3 is arranged as an inclined plane near the side wall of the explosion-proof valve 2; or/and the side wall of the buffer groove 3 away from the explosion-proof valve 2 is provided with an inclined plane. This arrangement gives the buffer tank 3 a greater capacity to absorb deformation.
In this embodiment, as shown in fig. 2, the buffer grooves 3 are disposed on the upper and lower sides of the cover plate 1, and the buffer grooves 3 on the same side as the explosion-proof plate 21 are disposed, the inner wall of the side close to the explosion-proof valve 2 is a vertical surface perpendicular to the explosion-proof plate 21, and the inner wall of the side far from the explosion-proof valve 2 is an inclined surface facing the explosion-proof plate 21, and the inclination angle is about 45 °; the buffer groove 3 is positioned on the same side as the protection sheet 22, the inner wall of one side close to the explosion-proof valve 2 is an inclined plane deviating from the protection sheet 22, the inclined angle is about 45 degrees, the inner wall of one side far away from the explosion-proof valve 2 is a vertical surface perpendicular to the protection sheet 22, and the inclined planes of the buffer groove 3 on the upper side and the lower side of the cover plate 1 are arranged in parallel. As shown in fig. 3, the upper and lower sides of the cover plate 1 are also provided with the buffer groove 3, which is disposed around the explosion-proof valve 2, wherein the inner walls of the buffer groove 3, which are located at the same side as the protection sheet 22 and are close to and far from the explosion-proof valve 2, are inclined surfaces, and the inner walls are inclined relative to each other, so that the cross section of the buffer groove 3 is isosceles triangle. According to practical application, the side walls of the buffer groove 3, which are close to and far from the explosion-proof valve 2, can be independently set as inclined planes, and also can be set as inclined planes, and the inclination angles of the inclined planes can be properly adjusted.
Optionally, the side walls of the buffer groove 3, which are close to and far from the explosion-proof valve 2, are all vertical surfaces, and one ends of the buffer groove, which are far from the notch, extend out of inclined surfaces relatively towards the notch direction respectively. This arrangement gives the buffer tank 3 a greater capacity to absorb deformation.
In this embodiment, as shown in fig. 3, the buffer tank 3 on the same side as the explosion-proof plate 21 is close to and far from the side wall of the explosion-proof valve 2, that is, the inner walls on the left and right sides of the buffer tank 3 in fig. 3 are vertical surfaces, and inclined surfaces with mirror symmetry extend from one end far from the notch, that is, the upper ends of the vertical surfaces on the two sides in fig. 3, relatively downward, that is, relatively toward the notch direction, respectively, and the two inclined surfaces are parallel to the inner wall of the buffer tank 3 on the triangle on one side of the protection plate 22 in fig. 3. According to practical application, the inclination angles of the two inclined planes extending from the two side walls of the buffer tank 3, which are close to and far away from the explosion-proof valve 2, may be the same or different, and the two inclined planes may or may not intersect, so long as the cover plate 1 at the buffer tank 3 can absorb the stress inside and outside the battery cell to a greater extent, and simultaneously when the explosion-proof valve 2 bursts and pressure is released due to the abnormal pressure inside the battery cell, enough strength can be ensured, and the explosion-proof valve cannot be broken at the position.
Optionally, the width of the buffer tank 3 ranges from 0.5 mm to 3mm. The arrangement can ensure that the cover plate 1 at the buffer groove 3 can absorb the internal and external stress of the battery cell to a greater extent, and ensure that the cover plate has enough strength to avoid rupture when the explosion-proof valve 2 bursts and pressure is released due to the abnormal internal pressure of the battery cell. For example, the width of the buffer tank 3 may be 1mm, 2mm, or the like. The width of the buffer slot 3 may be arbitrarily selected within this range according to the practical application.
Optionally, the distance between the side wall of the buffer groove 3, which is close to the explosion-proof valve 2, and the explosion-proof valve 2 is 2-20mm. With this arrangement, when the cover plate 1 is impacted by external force, the buffer slot 3 can absorb the stress to a greater extent to deform, so as to protect the explosion-proof valve 2 from external stress or from smaller stress.
The distance between each position of the buffer groove 3, which is close to the side wall of the explosion-proof valve 2, and the explosion-proof valve 2 may be equal or unequal, for example, the distance between the two positions may be 5mm, 10mm, 15mm, etc. The distance between the buffer tank 3 and the explosion-proof valve 2 can be appropriately adjusted within this range according to the actual application.
Optionally, the thickness of the cover plate 1 at the buffer slot 3 is greater than 0.2mm. The arrangement can ensure that the cover plate 1 at the buffer groove 3 can absorb the internal and external stress of the battery cell to a greater extent, and ensure that the cover plate has enough strength to avoid rupture when the explosion-proof valve 2 bursts and pressure is released due to the abnormal internal pressure of the battery cell.
The thickness of the explosion-proof piece 21 is 0.1mm, and the thickness of the cover plate 1 at the buffer groove 3 is larger than 0.2mm according to experimental data, so that the buffer groove 3 can be prevented from being broken when the explosion-proof valve 2 is used for explosion pressure relief. According to practical application, the thickness of the cover plate 1 at the buffer slot 3 can be adjusted, for example, 0.3mm, 0.4mm, etc. are selected, and accordingly, the depth of the buffer slot 3 is adjusted.
Optionally, the buffer grooves 3 are formed at corresponding positions on two opposite side surfaces of the cover plate 1. By the arrangement, the cover plate 1 at the buffer tank 3 is more sensitive to the stress changes inside and outside the battery cell, so that the explosion-proof valve 2 is further protected, and the deformation failure possibility of the explosion-proof sheet 21 is reduced.
As shown in fig. 2 and 3, the buffer grooves 3 are provided at corresponding positions on the upper and lower surfaces of the cover plate 1, and the width and the spreading pattern of the buffer grooves 3 on the upper and lower sides are the same.
Optionally, the buffer slot 3 is integrally formed with the cover plate 1. And an integral forming process is adopted, so that the manufacturing procedures are reduced, and the manufacturing efficiency is improved.
In this embodiment, the buffer tank 3 is integrally extruded with the cover plate 1.
The utility model also provides a secondary battery, comprising the top cover assembly according to any one of the embodiments.
The battery comprises a shell and a battery cell arranged in the shell, wherein the top cover assembly is detachably connected with the shell and covers the battery cell.
According to the secondary battery, the buffer groove 3 is formed in the periphery of the explosion-proof valve 2 on the cover plate 1, the cover plate 1 at the buffer groove 3 is small in thickness and weak compared with other parts, when the battery cell breathes, part of stress can be born together with the explosion-proof sheet 21 of the explosion-proof valve 2, so that the strength fatigue attenuation degree of the explosion-proof sheet is reduced, and meanwhile, when the cover plate 1 is subjected to external stress, the buffer groove 3 can absorb deformation or deform preferentially, the influence on the explosion-proof sheet 21 of the explosion-proof valve 2 is reduced, and the function of the explosion-proof valve 2 is still reliable under the condition that a top cover component is subjected to external force is ensured.
The utility model also provides a battery pack comprising the secondary battery according to the embodiment.
According to the battery pack, the buffer groove 3 is formed in the periphery of the explosion-proof valve 2 on the cover plate 1, the cover plate 1 at the buffer groove 3 is small in thickness and weak compared with other parts, when the battery cell breathes, part of stress can be born together with the explosion-proof sheet 21 of the explosion-proof valve 2, so that the strength fatigue attenuation degree of the explosion-proof sheet is reduced, and meanwhile, when the cover plate 1 is subjected to external stress, the buffer groove 3 can absorb deformation or deform preferentially, the influence on the explosion-proof sheet 21 of the explosion-proof valve 2 is reduced, and the function of the explosion-proof valve 2 is still reliable under the condition that the top cover component is subjected to external force is ensured.
The above technical schemes can be combined according to the need to achieve the best technical effect.
The foregoing is only illustrative of the principles and preferred embodiments of the present utility model. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the utility model and should also be considered as the scope of protection of the present utility model.
Claims (9)
1. The utility model provides a top cap subassembly, includes the apron, and inlay in explosion-proof valve on the apron, its characterized in that:
the cover plate is provided with a buffer groove, and the buffer groove is arranged around the explosion-proof valve;
the side wall of the buffer groove, which is close to the explosion-proof valve, is provided with an inclined surface; or/and the combination of the two,
the side wall of the buffer groove far away from the explosion-proof valve is provided with an inclined plane.
2. The header assembly of claim 1, wherein:
the buffer groove is close to and far away from the side wall of the explosion-proof valve is arranged to be a vertical surface, and one end far away from the notch extends out of the inclined surface towards the notch direction relatively.
3. The header assembly of claim 1 or 2, wherein:
the width of the buffer groove ranges from 0.5 mm to 3mm.
4. The header assembly of claim 1 or 2, wherein:
the distance between the side wall of the buffer groove, which is close to the explosion-proof valve, and the explosion-proof valve is 2-20mm.
5. The header assembly of claim 1 or 2, wherein:
the thickness of the cover plate at the buffer groove is larger than 0.2mm.
6. The header assembly of claim 1 or 2, wherein:
the buffer grooves are formed in corresponding positions of the surfaces of the two opposite sides of the cover plate.
7. The header assembly of claim 1 or 2, wherein:
the buffer groove and the cover plate are integrally formed.
8. A secondary battery comprising the top cap assembly according to any one of claims 1 to 7.
9. A battery pack comprising the secondary battery according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321020195.7U CN220358269U (en) | 2023-04-28 | 2023-04-28 | Top cap subassembly, secondary cell and battery package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321020195.7U CN220358269U (en) | 2023-04-28 | 2023-04-28 | Top cap subassembly, secondary cell and battery package |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220358269U true CN220358269U (en) | 2024-01-16 |
Family
ID=89479533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321020195.7U Active CN220358269U (en) | 2023-04-28 | 2023-04-28 | Top cap subassembly, secondary cell and battery package |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220358269U (en) |
-
2023
- 2023-04-28 CN CN202321020195.7U patent/CN220358269U/en active Active
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