CN218498294U - Battery cover plate, single battery and battery device - Google Patents
Battery cover plate, single battery and battery device Download PDFInfo
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- CN218498294U CN218498294U CN202222714224.1U CN202222714224U CN218498294U CN 218498294 U CN218498294 U CN 218498294U CN 202222714224 U CN202222714224 U CN 202222714224U CN 218498294 U CN218498294 U CN 218498294U
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- explosion
- cover plate
- battery
- proof
- change material
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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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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses a battery cover plate, a single battery and a battery device, wherein the battery cover plate comprises a cover plate body, and the cover plate body is provided with an explosion-proof assembly; the explosion-proof assembly comprises an explosion-proof sheet and an insulating film, the explosion-proof sheet is arranged on the bottom surface of the cover plate body, and the insulating film is arranged on the top surface of the cover plate body; be provided with accommodation space between explosion-proof piece and the insulating film, be provided with phase change material in the accommodation space. When the battery is out of control thermally, the phase-change material can effectively protect the explosion-proof sheet, prevent the explosion-proof sheet from being damaged or fused, well prevent adjacent single batteries from being out of control thermally, and improve the safety performance of the battery.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a battery cover plate, battery cell and battery device.
Background
In the related art, a plurality of single batteries are arranged in a battery pack side by side, if one single battery is out of control due to heat, flame, high-temperature gas or high-temperature substances with higher temperature are ejected after the out of control due to heat and impact can be made to fall on an explosion-proof valve of an adjacent single battery after the heat is reflected by a box cover, so that the explosion-proof valve is damaged or melted, and the adjacent single battery is also out of control due to heat, and the improvement is provided.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a battery cover plate, which has a good effect of preventing thermal runaway.
The utility model also provides a battery cell, it includes foretell battery apron.
The utility model also provides a battery device, it includes foretell battery cell.
The battery cover plate comprises a cover plate body, wherein the cover plate body is provided with an explosion-proof assembly; the explosion-proof assembly comprises an explosion-proof sheet and an insulating film, the explosion-proof sheet is arranged on the bottom surface of the cover plate body, and the insulating film is arranged on the top surface of the cover plate body; and an accommodating space is arranged between the explosion-proof sheet and the insulating film, and a phase-change material is arranged in the accommodating space.
In this embodiment, phase change material has the heat absorption and releases heat the function, and in the battery normal use in-process, when the battery temperature is in than high temperature, phase change material can absorb the heat, cools down the battery, when the battery temperature is in the temperature of comparing ground temperature, phase change material can release heat, avoids the battery temperature to hang down excessively, makes the battery recycle better, improves the performance of battery.
More important, when the battery takes place thermal runaway, the higher flame of temperature is erupted behind the thermal runaway, high-temperature gas or high-temperature material can strike on the explosion-proof subassembly of adjacent battery cell through the case lid reflection back, at this moment, the higher flame of temperature, high-temperature gas or high-temperature material can contact with the insulating film earlier, wherein partly flame, high-temperature gas or high-temperature material can be cushioned by the insulating film, break through behind the insulating film again with the contact of phase change material, phase change material carries out the phase transition after absorbing a large amount of heats, therefore have thermal-insulated effect well, can protect the explosion-proof piece effectively, avoid the explosion-proof piece to take place damage or melting, avoid adjacent battery cell also to take place thermal runaway well, improve the security performance of battery.
According to the utility model discloses battery cell, it includes foretell battery apron.
According to the utility model discloses battery device, it includes foretell battery cell.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of a battery cover plate according to an embodiment of the present invention;
fig. 2 is an internal schematic view of a battery cover plate according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a cover plate body according to an embodiment of the present invention;
FIG. 4 is a partial enlarged view of A in FIG. 3;
icon: 1-cover plate body, 11-boss, 12-channel, 13-explosion-proof hole, 2-explosion-proof component, 21-explosion-proof sheet, 211-weak part, 212-non-weak part, 22-insulating film, 23-fixing part, 3-containing space and 4-phase change material.
Detailed Description
For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
A battery cover and a battery device according to an embodiment of the present invention will be described with reference to fig. 1 to 4.
Referring to fig. 1-2, a battery cover plate according to an embodiment of the present invention includes a cover plate body 1, wherein the cover plate body 1 is provided with an explosion-proof assembly 2; the explosion-proof component 2 comprises an explosion-proof sheet 21 and an insulating film 22, wherein the explosion-proof sheet 21 is arranged on the bottom surface of the cover plate body 1, and the insulating film 22 is arranged on the top surface of the cover plate body 1; an accommodating space 3 is arranged between the explosion-proof sheet 21 and the insulating film 22, and a phase-change material 4 is arranged in the accommodating space 3.
In this embodiment, phase change material 4 has the heat absorption and releases heat the function, and in the battery normal use in-process, when the battery temperature is in than high temperature, phase change material 4 can absorb heat, cools down the battery, and when the battery temperature is in than low temperature, phase change material 4 can release heat, avoids the battery temperature to hang down excessively, makes the battery recycle better, improves the performance of battery.
More importantly, when the battery takes place the thermal runaway, the higher flame of temperature that erupts behind the thermal runaway, high-temperature gas or high-temperature material can strike on the explosion-proof subassembly 2 of adjacent battery cell after the case lid reflection, at this moment, the higher flame of temperature, high-temperature gas or high-temperature material can contact with insulating film 22 earlier, wherein insulating film 22 can cushion partly flame, high-temperature gas or high-temperature material, break through insulating film 22 after again with phase change material 4 contact, phase change is carried out after a large amount of heats is absorbed to phase change material 4, has the thermal-insulated effect well, can protect explosion-proof sheet 21 effectively, avoid explosion-proof sheet 21 to take place damage or melting, avoid adjacent battery cell also to take place the thermal runaway well, improve the security performance of battery.
Specifically, the cover plate body 1 is provided with the explosion-proof hole 13 along the thickness direction thereof in a penetrating manner, the explosion-proof sheet 21 is arranged on the bottom surface of the explosion-proof hole 13, the insulating film 22 is arranged on the top surface of the explosion-proof hole 13, and the explosion-proof sheet 21, the insulating film 22 and the explosion-proof hole 13 can form the accommodating space 3.
Further, referring to fig. 2 to 4, according to the battery cover plate of the embodiment of the present invention, the top surface of the cover plate body 1 is provided with a boss 11, and the insulating film 22 is disposed on the boss 11; the boss 11 is provided with a passage 12 therethrough, and the passage 12 is used to communicate the accommodating space 3 with the external space.
In this embodiment, the channel 12 can communicate with the accommodating space 3 and the external space, so as to ensure that the pressure of the accommodating space 3 is consistent with the external atmospheric pressure, prevent the explosion-proof component 2 from being exploded when reaching the set atmospheric pressure, and ensure that the explosion-proof component 2 can normally work.
Specifically, the boss 11 surrounds the top surface of the explosion-proof hole 13, and the shape of the boss 11 is the same as the shape of the explosion-proof hole 13.
Further, according to the battery cover plate of the embodiment of the present invention, the phase change material 4 is a liquid-gas phase change material.
In the present embodiment, the liquid-gas phase change material absorbs a large amount of heat and changes from the original liquid phase to the gas phase, and then is discharged to the outside through the channel 12 ， Therefore, partial heat can be absorbed, the thermal runaway phenomenon of the battery is relieved, and the pressure relief channel cannot be blocked.
In some embodiments, according to the battery cover plate of the present disclosure, the phase change material 4 may also be a solid-liquid phase change substance.
In this embodiment, after the solid-liquid phase change material absorbs a large amount of heat, the solid phase change material is changed into a liquid phase, and after the thermal runaway of the battery occurs, the explosion-proof sheet 21 bursts, and the liquid phase change material 4 can flow into the battery, so that the further thermal runaway of the battery can be effectively prevented, and the safety performance is further improved.
Further, referring to fig. 2, according to the battery cover plate of the embodiment of the present invention, the explosion-proof sheet 21 is provided with the weak portion 211 and the non-weak portion 212, and the slope of the non-weak portion 212 is greater than the slope of the weak portion 211.
In this embodiment, when the thermal runaway of the battery occurs, the explosion-proof sheet 21 will burst at the position of the weak portion 211, and the liquid phase change material 4 will flow into the battery from the position of the weak portion 211, so as to prevent the further thermal runaway of the battery.
Further, referring to fig. 2, according to the battery cover plate of the embodiment of the present invention, the explosion-proof plate 21 is an arch structure, and the peripheral outer edge of the explosion-proof plate 21 is the weak portion 211. The fixing portion 23 is disposed on the circumferential outer side of the weak portion 211, the fixing portion 23 is disposed on the bottom surface of the cover plate body 1, and it is understood that the weak portion 211 is disposed between the fixing portion 23 and the non-weak portion 212.
In this embodiment, when thermal runaway of the battery occurs, the explosion-proof sheet 21 will burst at the position of the weak portion 211 at the outer edge in the circumferential direction, at this moment, the whole explosion-proof sheet 21 will fall down to form a sufficiently large inflow port, and the liquid phase change material 4 will rapidly flow into the battery, thereby more rapidly preventing further thermal runaway of the battery.
Specifically, the explosion-proof sheet 21 may have an oval shape, and the fixing portion 23 may also have an oval shape along with the explosion-proof sheet 21.
In some embodiments, according to the battery cover plate of the present invention, the phase change material 4 has a mass M and a unit of 10 -3 Kg, the explosion pressure of the explosion-proof sheet 21 is P1 in Pa, the set explosion pressure of the explosion-proof assembly 2 is P, and g is a gravity constant;
then, P is more than or equal to P1+ M g/A, wherein A is the contact area of the phase change material 4 and the explosion-proof sheet 21, and the unit is M 2 。
In this embodiment, since the phase change material 4 applies a certain pressure to the explosion-proof sheet 21, in order to ensure that the explosion-proof assembly 2 can explode when the set explosion pressure is P, it is necessary to consider that the explosion pressure of the explosion-proof sheet 21 after the phase change material 4 is disposed is P1 and the gravity Mg of the phase change material 4, so as to prevent the phase change material 4 from being too large in mass and applying too much pressure to the explosion-proof sheet 21, so that the explosion-proof sheet 21 cannot explode under the set pressure.
In some embodiments, according to the battery cover plate of the embodiment of the present invention, the thickness of the phase change material 4 is t, wherein t is greater than or equal to 0.2mm and less than or equal to 3mm.
In this embodiment, in this thickness range, the phase change material 4 does not apply excessive pressure to the explosion-proof sheet 21, and the explosion-proof sheet 21 can be exploded under a set pressure, that is: the phase change material 4 absorbs heat sufficiently.
In some embodiments, according to the battery cover plate of the present invention, the outer side of the phase change material 4 is provided with an encapsulation film.
In the present embodiment, the encapsulation film can prevent the phase change material 4 from leaking between the insulating film 22 and the cap plate body 1 when the battery is in normal use.
According to the embodiment of the present invention, the single battery includes the above-mentioned battery cover plate, wherein the single battery may be a lithium ion primary battery, a lithium ion secondary battery, or a lithium sulfur battery, which is not limited in this respect; the single battery may be in a shape of a cylinder, a rectangular parallelepiped, a cube, or other shapes, which is not limited.
According to the utility model discloses battery device, including foretell battery cell, wherein battery cell can set up a plurality ofly, and a plurality of battery accessible series connection, parallelly connected or the mode of series-parallel connection are connected to realize great capacity or power output, satisfy user power consumption demand.
The battery device may be a battery pack, and of course, may also be a battery pack.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by combining the above technical features at will. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (11)
1. A battery cover plate, characterized in that:
the anti-explosion cover plate comprises a cover plate body (1), wherein the cover plate body (1) is provided with an anti-explosion assembly (2);
the explosion-proof assembly (2) comprises an explosion-proof sheet (21) and an insulating film (22), the explosion-proof sheet (21) is arranged on the bottom surface of the cover plate body (1), and the insulating film (22) is arranged on the top surface of the cover plate body (1);
an accommodating space (3) is arranged between the explosion-proof sheet (21) and the insulating film (22), and a phase-change material (4) is arranged in the accommodating space (3).
2. The battery cover plate according to claim 1, wherein: a boss (11) is arranged on the top surface of the cover plate body (1), and the insulating film (22) is arranged on the boss (11);
the boss (11) is provided with a channel (12) in a penetrating mode, and the channel (12) is used for enabling the accommodating space (3) to be communicated with an external space.
3. A battery cover plate according to claim 2, wherein: the phase change material (4) is a liquid-gas phase change substance.
4. A battery cover plate according to claim 1, wherein: the phase change material (4) is a solid-liquid phase change substance.
5. The battery cover plate according to claim 4, wherein: the explosion-proof piece (21) is provided with a weak portion (211) and a non-weak portion (212), and the gradient of the non-weak portion (212) is larger than that of the weak portion (211).
6. The battery cover plate according to claim 5, wherein: the explosion-proof piece (21) is of an arch structure, and the peripheral outer edge of the explosion-proof piece (21) is the weak part (211).
7. A battery cover plate according to claim 1, wherein: the mass of the phase change material (4) is M, and the unit is 10 -3 Kg, the explosion pressure of the explosion-proof sheet (21) is P1, the unit is Pa, the set explosion pressure of the explosion-proof assembly (2) is P, and g is a gravity constant;
p is more than or equal to P1+ M g/A, wherein A is the contact area of the phase-change material (4) and the explosion-proof sheet (21) and the unit is M 2 。
8. A battery cover plate according to claim 1, wherein: the thickness of the phase change material (4) is t, wherein t is more than or equal to 0.2mm and less than or equal to 3mm.
9. A battery cover plate according to claim 1, wherein: and an encapsulation film is arranged on the outer side of the phase change material (4).
10. A cell, characterized by: comprising a battery cover plate according to any of claims 1-9.
11. A battery device, characterized by: comprising a cell according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222714224.1U CN218498294U (en) | 2022-10-14 | 2022-10-14 | Battery cover plate, single battery and battery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222714224.1U CN218498294U (en) | 2022-10-14 | 2022-10-14 | Battery cover plate, single battery and battery device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218498294U true CN218498294U (en) | 2023-02-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222714224.1U Active CN218498294U (en) | 2022-10-14 | 2022-10-14 | Battery cover plate, single battery and battery device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218498294U (en) |
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2022
- 2022-10-14 CN CN202222714224.1U patent/CN218498294U/en active Active
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