CN219739212U - Top cap subassembly and contain its electric core - Google Patents
Top cap subassembly and contain its electric core Download PDFInfo
- Publication number
- CN219739212U CN219739212U CN202320147361.3U CN202320147361U CN219739212U CN 219739212 U CN219739212 U CN 219739212U CN 202320147361 U CN202320147361 U CN 202320147361U CN 219739212 U CN219739212 U CN 219739212U
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- CN
- China
- Prior art keywords
- heat insulation
- adhesive
- insulation sheet
- pressure
- explosion
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- 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.)
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Links
- 238000009413 insulation Methods 0.000 claims abstract description 47
- 239000000853 adhesive Substances 0.000 claims description 34
- 230000001070 adhesive effect Effects 0.000 claims description 34
- 239000012790 adhesive layer Substances 0.000 claims description 15
- 239000010445 mica Substances 0.000 claims description 4
- 229910052618 mica group Inorganic materials 0.000 claims description 4
- 238000004880 explosion Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 210000004027 cell Anatomy 0.000 description 25
- 239000000463 material Substances 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 210000005056 cell body Anatomy 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model provides a top cover assembly and a battery cell comprising the same, which comprise a cover plate and an explosion-proof valve, wherein a first heat insulation sheet and a second heat insulation sheet are arranged on the surface of the cover plate, and the end parts of the first heat insulation sheet and/or the second heat insulation sheet are covered on a pressure relief opening of the explosion-proof valve; the first and/or second thermal shield is configured to disengage from the pressure relief vent when the pressure released by the pressure relief vent is greater than the first pressure. When the thermal runaway pressure relief occurs in the battery core and the pressure released by the pressure relief opening of the explosion-proof valve is larger than the first pressure, the end part of the first heat insulation sheet and the end part of the second heat insulation sheet are punched away from the surface of the cover plate, so that heat in the battery core can be released at the pressure relief opening, the battery core is ensured to have a good heat dissipation effect, the battery core is protected from thermal runaway, and the condition that other single battery cores fail due to high temperature is avoided.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery cell comprising the top cover assembly.
Background
The thermal runaway is a root cause of unsafe battery, once the battery core is in thermal runaway, high-temperature and high-pressure gas is rapidly sprayed outwards through the explosion-proof valve of the battery core, and the melt sprayed out from the explosion-proof valve port at the top of the battery core splashes to the periphery, so that the thermal runaway of other battery cores around can be triggered. Therefore, it is important how to improve the thermal runaway safety of the battery.
To prevent thermal runaway from being conducted to adjacent cell structures, a thermal insulation layer is typically provided between different cells within the same battery module. As shown in fig. 1, a heat insulation sheet 2' is arranged on a battery core body 1' to insulate the battery core body 1', and the heat insulation sheet 2' completely covers the surface of the battery core body 1', so that the heat insulation sheet 2' is not easy to separate from the battery core body 1' when the temperature in the battery core body 1' is too high to release pressure, and the heat dissipation effect of the battery core body 1' is not good and thermal runaway is easy to occur. Therefore, a protection structure applied to the battery cell is required to be arranged, so that the battery cell can be kept to have a good heat dissipation effect, and the other battery cells can be prevented from being triggered to generate thermal runaway.
Disclosure of Invention
The utility model aims to overcome the defect that a heat insulation layer arranged on a battery cell in the prior art can reduce the heat dissipation effect inside the battery cell, and provides a top cover assembly and the battery cell comprising the top cover assembly.
The utility model solves the technical problems by the following technical scheme:
the utility model provides a top cover assembly, which comprises a cover plate and an explosion-proof valve, wherein a first heat insulation sheet and a second heat insulation sheet are arranged on the surface of the cover plate, and the end parts of the first heat insulation sheet and/or the second heat insulation sheet are covered on a pressure relief opening of the explosion-proof valve;
the first and/or second thermal shield is configured to disengage from the pressure relief vent when the pressure released by the pressure relief vent is greater than the first pressure.
In this scheme, be equipped with first thermal-insulated piece and second thermal-insulated piece at the surface of apron, and cover the tip of first thermal-insulated piece and/or second thermal-insulated piece and locate the pressure release mouth of explosion-proof valve, when the pressure that the pressure release mouth released is greater than first pressure when the heat loss pressure release appears in the electric core, the tip of first thermal-insulated piece or second thermal-insulated piece is washed away the surface of apron, makes the heat energy in the electric core obtain releasing at the pressure release mouth to carry out thermal runaway protection to the electric core, avoid appearing the high temperature and arouse the condition of the inefficacy of other monomer electric cores. And after the heat insulating sheet is washed away, one end far away from the pressure relief opening is still connected to the cover plate. The heat insulation sheet cannot be impacted to cause falling and loss, so that failure mechanism analysis of the battery cell cannot be affected.
Preferably, the top cover assembly further comprises an adhesive layer, wherein the adhesive layer is arranged between the first heat insulation sheet and the cover plate and between the second heat insulation sheet and the cover plate, and is used for adhering the first heat insulation sheet and the second heat insulation sheet to the surface of the cover plate.
In this scheme, bond first thermal-insulated piece and second thermal-insulated piece on the apron through setting up the adhesive linkage, it is simple and convenient, be convenient for simultaneously when the pressure release of electric core with thermal-insulated piece pressure at the partial and apron separation of pressure release mouth.
Preferably, the material of the adhesive layer is PET.
In this scheme, the PET material can be melted at first when explosion-proof valve pressure release for thermal-insulated piece and apron are separated easily, thereby make the hot gas flow that pressure release produced directly strike on first thermal-insulated piece and/or second thermal-insulated piece and break away from it with the pressure release mouth, be favorable to the pressure release to exhaust, carry out thermal runaway protection to the electric core.
Preferably, the adhesive layer includes a first adhesive member and a second adhesive member, the first adhesive member is disposed corresponding to the first heat insulation sheet, and the second adhesive member is disposed corresponding to the second heat insulation sheet.
In this scheme, when processing the assembly, fix first thermal-insulated piece on the apron through first bonding spare, the second bonding spare is fixed the second thermal-insulated piece on the apron, can be convenient for the location of first thermal-insulated piece and second thermal-insulated piece.
Preferably, the width of the first adhesive member is not greater than the width of the first heat insulating sheet;
and/or the width of the second adhesive piece is not larger than the width of the second heat insulation sheet.
In this scheme, the width of bonding spare is not greater than the width of thermal-insulated piece for the bonding spare can not adhere other spare parts.
Preferably, the first adhesive piece and the first heat insulation sheet have the same length, and the first adhesive piece can be melted when the explosion-proof valve is depressurized;
and/or the second bonding piece and the second heat insulation sheet are equal in length, and the second bonding piece can be melted when the explosion-proof valve is depressurized.
In this aspect, the first adhesive is used only to adhere the first insulating sheet, and the second adhesive is used only to adhere the second insulating sheet. The first heat insulating sheet and the second heat insulating sheet are covered on the surface of the pressure relief area singly or together, and when the explosion-proof valve is used for relieving pressure, the end part of the first heat insulating sheet and/or the end part of the second heat insulating sheet are flushed away, so that heat release can be completed.
Preferably, the bonding layer can be melted when the explosion-proof valve is depressurized, and the first bonding piece and the second bonding piece are of an integrated structure.
In this scheme, adopt the adhesive linkage of integral type to improve production efficiency, the adhesive linkage can be melted when explosion-proof valve pressure release, and the air current etc. direct impact that the pressure release produced of being convenient for makes heat insulating sheet and pressure release mouth break away from at the heat insulating sheet surface, is favorable to the pressure release to exhaust, carries out thermal runaway protection to the electric core.
Preferably, the first heat insulating sheet and the second heat insulating sheet are provided with avoiding holes.
In this scheme, through setting up dodging the hole, expose the utmost point post of electric core, the external electric connecting piece of being convenient for is connected with the utmost point post of electric core.
Preferably, the first and/or second thermal insulation sheets are mica sheets.
In the scheme, the mica sheet is a good heat insulation material, so that the heat insulation sheet covering the pressure relief area has a good prevention and control effect.
The utility model provides a battery cell, comprising:
a housing;
an electrode assembly disposed within the housing, the electrode assembly including an electrode assembly body and a tab extending from the electrode assembly body;
the top cap assembly as described above, further comprising an electrode terminal provided on a cap plate, the cap plate being connected to the case;
and the pin part is electrically connected with the tab.
The battery cell of the scheme has a good heat dissipation effect; and when the single battery cell is out of control, other battery cells are not affected, so that the battery cell has a good protection effect.
The utility model has the positive progress effects that:
the top cover assembly comprises an explosion-proof valve, wherein a first heat insulation sheet and a second heat insulation sheet are arranged on the surface of a pressure release opening of the explosion-proof valve, when the battery core is subjected to thermal runaway pressure release, and the pressure released by the pressure release opening of the explosion-proof valve is larger than the first pressure, the end part of the first heat insulation sheet and the end part of the second heat insulation sheet are punched away from the surface of a cover plate, so that heat in the battery core can be released at the pressure release opening, the battery core is ensured to have a good heat dissipation effect, the battery core is subjected to thermal runaway protection, and the condition that other single battery cores fail due to high temperature is avoided.
Drawings
Fig. 1 is a schematic view of a structure of a heat insulating sheet in the prior art.
Fig. 2 is a top view of a cover plate according to a preferred embodiment of the utility model.
FIG. 3 is a schematic view of a heat insulating sheet at a pressure relief vent being blown off the surface of a cover plate according to a preferred embodiment of the utility model.
FIG. 4 is a schematic view showing the separation of the heat insulating sheet from the cover plate according to the preferred embodiment of the utility model.
Fig. 5 is a schematic structural diagram of another embodiment of the present utility model.
Cell body 1'
Heat insulation sheet 2'
Cover plate 1
Adhesive layer 2
First heat insulating sheet 3
Second heat insulating sheet 4
First adhesive member 5
Second adhesive member 6
Avoidance hole 7
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.
The embodiment provides a top cover assembly, this top cover assembly includes apron 1 and explosion-proof valve, as shown in fig. 2, is equipped with first thermal-insulated piece 3 and second thermal-insulated piece 4 on the apron 1, and the tip lid of first thermal-insulated piece 3 and second thermal-insulated piece 4 is located on the pressure release mouth of explosion-proof valve. The first and second heat insulating sheets 3 and 4 are arranged such that the first and second heat insulating sheets 3 and 4 are disengaged from the pressure relief vent when the pressure released by the pressure relief vent is greater than the first pressure.
When thermal runaway occurs in the battery cell and the pressure released by the pressure release opening is larger than the first pressure, as shown in fig. 3-4, the end part of the first heat insulation sheet 3 and the end part of the second heat insulation sheet 4 are punched away from the surface of the cover plate 1 of the battery cell, so that heat energy in the battery cell is released at the pressure release opening, the battery cell is ensured to have a good heat dissipation effect, the battery cell is protected from thermal runaway, and the failure of other single battery cells caused by high temperature is avoided. And after the end part of the first heat insulating sheet 3 and the second heat insulating sheet 4 are washed away, one end far away from the pressure relief opening is still connected to the cover plate 1, and the first heat insulating sheet 3 and the second heat insulating sheet 4 cannot be impacted to cause falling and loss, so that failure mechanism analysis of the battery cell cannot be affected.
In other embodiments, the first thermal barrier 3 does not cover the pressure relief vent, and only the second thermal barrier 4 is provided to cover the pressure relief vent alone. When the pressure released by the pressure release opening is larger than the first pressure, the first heat insulation sheet 3 is connected with the battery cell body 1, and the end part of the second heat insulation sheet 4 is separated from the pressure release opening.
In this embodiment, the top cover assembly further includes an adhesive layer 2, the adhesive layer 2 is disposed between the first heat insulating sheet 3 and the battery cell cover plate 1 and between the second heat insulating sheet 4 and the cover plate 1, and the adhesive layer 2 is used for adhering the first heat insulating sheet 3 and the second heat insulating sheet 4 to the surface of the cover plate 1 of the battery cell body 1. The bonding layer 2 is simple and convenient to bond, and meanwhile, the part of the heat insulation sheet pressed at the pressure relief opening is conveniently separated from the cover plate 1 when the battery cell is subjected to pressure relief.
In this embodiment, the material of the adhesive layer 2 is PET. PET material can be melted at first when explosion-proof valve pressure release for thermal-insulated piece and apron 1 are separated easily, thereby make the hot gas flow that pressure release produced directly strike on first thermal-insulated piece 3 and second thermal-insulated piece 4 and break away from it and pressure release mouth, be favorable to the pressure release to exhaust, carry out thermal runaway protection to the electric core.
In other embodiments, the adhesive layer 2 may be made of other low melting point materials that may be melted when the explosion proof valve is depressurized.
In this embodiment, tie coat 2 is integrated into one piece structure, can improve production efficiency, and tie coat 2 can be melted when explosion-proof valve pressure release, and air current etc. that the pressure release produced of being convenient for directly strike and make heat insulating sheet and pressure release mouth break away from at the heat insulating sheet surface, are favorable to the pressure release to exhaust, carry out thermal runaway protection to the electric core.
In other embodiments, as shown in fig. 5, the adhesive layer 2 includes a first adhesive 5 and a second adhesive 6, the first adhesive 5 is disposed corresponding to the first heat insulating sheet 3, and the second adhesive 6 is disposed corresponding to the second heat insulating sheet 4. The first adhesive 5 has the same length as the first heat insulating sheet 3, and the second adhesive 6 has the same length as the second heat insulating sheet 4. The first heat insulation sheet 3 is fixed on the cover plate 1 through the first bonding piece 5, and the second heat insulation sheet 4 is fixed on the cover plate 1 through the second bonding piece 6, so that the positioning of the first heat insulation sheet 3 and the second heat insulation sheet 4 can be facilitated.
Preferably, the width of the first adhesive 5 is not greater than the width of the first insulating sheet 3. The width of the second adhesive member 6 is not greater than the width of the second heat insulating sheet 4 so that the adhesive member does not adhere to other parts.
As shown in fig. 2, the first heat insulating sheet 3 and the second heat insulating sheet 4 are each provided with a relief hole 7. Through setting up dodging hole 7, expose the utmost point post on the electric core, be convenient for outside electric connecting piece is connected with the utmost point post of electric core.
In this embodiment, the first heat insulating sheet 3 and the second heat insulating sheet 4 are mica sheets. In other embodiments, the first heat insulating sheet 3 and the second heat insulating sheet 4 may be made of other materials with good heat insulating performance and good flexibility.
The embodiment also provides a battery cell, which comprises a shell, an electrode assembly, the top cover assembly and a pin component. The electrode assembly is arranged in the shell and comprises an electrode assembly body and a tab extending from the electrode assembly body. The cap assembly further includes electrode terminals provided on the cap plate 1, and the cap plate 1 is connected to the case. The pin component is electrically connected with the tab.
While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.
Claims (10)
1. The top cover assembly comprises a cover plate and an explosion-proof valve, and is characterized in that a first heat insulation sheet and a second heat insulation sheet are arranged on the surface of the cover plate, and the end parts of the first heat insulation sheet and/or the second heat insulation sheet are covered on a pressure relief opening of the explosion-proof valve;
the first and/or second thermal shield is configured to disengage from the pressure relief vent when the pressure released by the pressure relief vent is greater than the first pressure.
2. The header assembly of claim 1, further comprising an adhesive layer disposed between the first thermal shield and the cover plate and between the second thermal shield and the cover plate for adhering the first thermal shield and the second thermal shield to the surface of the cover plate.
3. The header assembly of claim 2, wherein the adhesive layer is PET.
4. The header assembly of claim 2, wherein the adhesive layer comprises a first adhesive and a second adhesive, the first adhesive being disposed in correspondence with the first thermal shield and the second adhesive being disposed in correspondence with the second thermal shield.
5. The header assembly of claim 4, wherein the width of the first adhesive is no greater than the width of the first insulating sheet;
and/or the width of the second adhesive piece is not larger than the width of the second heat insulation sheet.
6. The header assembly of claim 4, wherein the first adhesive is of equal length to the first insulating sheet, the first adhesive being capable of being melted upon decompression of the explosion proof valve;
and/or the second bonding piece and the second heat insulation sheet are equal in length, and the second bonding piece can be melted when the explosion-proof valve is depressurized.
7. The cap assembly of claim 4, wherein the adhesive layer is capable of being melted when the explosion proof valve is depressurized, and the first adhesive member and the second adhesive member are integrally formed.
8. The header assembly of claim 1, wherein the first and second insulating sheets are provided with relief holes.
9. The header assembly of any one of claims 1-8, wherein the first thermal shield and/or the second thermal shield is a mica sheet.
10. A cell, comprising:
a housing;
an electrode assembly disposed within the housing, the electrode assembly including an electrode assembly body and a tab extending from the electrode assembly body;
the top cap assembly according to any one of claims 1 to 9, further comprising an electrode terminal provided on a cap plate, the cap plate being connected to the case;
and the pin part is electrically connected with the tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320147361.3U CN219739212U (en) | 2023-02-01 | 2023-02-01 | Top cap subassembly and contain its electric core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320147361.3U CN219739212U (en) | 2023-02-01 | 2023-02-01 | Top cap subassembly and contain its electric core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219739212U true CN219739212U (en) | 2023-09-22 |
Family
ID=88029007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320147361.3U Active CN219739212U (en) | 2023-02-01 | 2023-02-01 | Top cap subassembly and contain its electric core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219739212U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117438734A (en) * | 2023-11-24 | 2024-01-23 | 宁德新能源科技有限公司 | Shell, battery core and electric equipment |
-
2023
- 2023-02-01 CN CN202320147361.3U patent/CN219739212U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117438734A (en) * | 2023-11-24 | 2024-01-23 | 宁德新能源科技有限公司 | Shell, battery core and electric equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |