CN218919058U - Dry heating prevention heating film and battery pack - Google Patents
Dry heating prevention heating film and battery pack Download PDFInfo
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- CN218919058U CN218919058U CN202222699177.8U CN202222699177U CN218919058U CN 218919058 U CN218919058 U CN 218919058U CN 202222699177 U CN202222699177 U CN 202222699177U CN 218919058 U CN218919058 U CN 218919058U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 250
- 230000002265 prevention Effects 0.000 title claims abstract description 20
- 238000002844 melting Methods 0.000 claims abstract description 18
- 230000008018 melting Effects 0.000 claims abstract description 18
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 3
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 3
- -1 iron-chromium-aluminum Chemical compound 0.000 claims description 3
- 229910001120 nichrome Inorganic materials 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000020169 heat generation Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 230000008092 positive effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a dry heating prevention heating film and a battery pack, wherein the dry heating prevention heating film comprises an insulating layer and a heating core plate, the heating core plate comprises at least 1 heating component, the heating component comprises a conductive part and at least 2 heating units connected in parallel between the conductive parts, the heating units and the conductive parts form a passage, the heating units are connected in series by the heating parts and the connecting parts to form the passage, and the melting point of the heating parts is larger than that of the connecting parts. After the heating unit generates dry heating, the low-melting-point connecting material is fused when the temperature is greatly increased to form an open circuit, and the heating is stopped, so that a thermal runaway accident is avoided; meanwhile, after one or a few of the heating units are melted due to temperature rise, the heating assembly can not influence the heating of other heating units, so that the heating film still has a heating function, the probability of stopping the operation of the battery heating system is greatly reduced, the positive effect on improving the working performance of the battery is achieved, and the battery heating system is suitable for large-scale application in the battery heating system.
Description
Technical Field
The utility model relates to the field of battery heating systems, in particular to a dry heating prevention heating film and a battery pack.
Background
With the large number of uses of power cells, the temperature sensitivity window of the cells is also becoming more apparent, resulting in serious impact on the performance, safety and cycle life of the cells. The core of solving the battery temperature problem is to develop a battery thermal management technology, and provide guarantee for stable, efficient and safe operation of the battery. The main purpose of battery thermal management is to keep the battery system operating within a proper temperature range throughout, thereby maintaining the optimal operating state of the battery pack. The battery thermal management system mainly comprises four functions of heat dissipation, heating, heat preservation and temperature equalization.
The power battery used in the north basically has a heating function, the heating mode is divided into a heating plate, a heating film or liquid heating mode and the like, wherein the heating film has the advantages of light weight and high heating rate, so that the heating film is more applied to a thermal management system of the constant-force battery, but once the heating film is dry-burned, a blackening phenomenon occurs, and potential safety hazards exist.
In the existing heating film heating system, in order to avoid thermal runaway accidents caused by dry heating, most of the problems are solved by utilizing a temperature control switch and/or a temperature alarm system, and after dry heating occurs and a certain temperature is reached, the temperature control switch can be automatically powered off and alarm is carried out through the temperature alarm system, so that the temperature is prevented from further rising. However, the conventional heating system avoids a thermal runaway accident caused by continuous heating, but loses a heating function when power is off, so that the working environment of the battery is changed, and the performance of the battery is seriously affected.
Disclosure of Invention
The utility model aims at: aiming at the defects of the existing heating film, the dry heating-preventing heating film is provided, and meanwhile, the battery pack is also provided.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the anti-dry heating film comprises an insulating layer and a heating core plate; the heating core plate comprises at least 1 heating component; the heating component comprises a conductive part and at least 2 heating units connected in parallel between the conductive parts, and the heating units and the conductive parts form a passage; the heating unit is formed by connecting a heating part and a connecting part in series to form a passage; the melting point of the heating part is larger than that of the connecting part.
According to the dry-heating-preventing heating film, the heating parts and the connecting parts in the heating units are designed into conductive materials with different melting points by utilizing the characteristics of different melting points of different metal materials, so that after the heating units are subjected to dry heating, the connecting materials with low melting points can be fused when the temperature is greatly increased, the heating units are broken, heating is stopped, and thermal runaway accidents are avoided; meanwhile, the heating component is also designed to be formed by connecting a plurality of heating units in parallel, so that after one or a small number of heating units of the heating component are melted due to temperature rise, the heating of other heating units can not be influenced, the heating film still has a heating function, the stop probability of the battery heating system is greatly reduced, the positive effect on improving the working performance of the battery is achieved, and the battery heating component is suitable for large-scale application in the battery heating system.
The insulation layer is used for insulating the heating core plate, so that internal short circuit and electric leakage of the heating core plate are avoided; preferably, the insulating layer is an insulating film or an insulating coating; more preferably, the insulating layer is a polyimide film; the polyimide film has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance and dielectric resistance, can be used for a long time within the temperature range of-269 ℃ to 280 ℃, can reach the high temperature of 400 ℃ in short time, and is more suitable for being used in power batteries.
Wherein, preferably, the heating core plate comprises at least 2 heating components, and the heating core plate is connected in series to form a passage; by adding the heating component, the area of the heating film can be increased to meet the heating requirements of power batteries with different sizes, and after one heating unit in the heating component is disconnected due to dry heating and melting, the heating of other heating units can not be influenced.
Wherein, preferably, the heating core board further comprises a wire; the lead is connected with the conductive part of the heating component and forms a passage; the wire supplies power for the heating core plate, so that the heating core plate can generate heat and raise the temperature of the battery.
Preferably, in the heating assembly, the conductive part is connected with the heating part and/or the connecting part of the heating unit and forms a passage; according to the practical requirement, various connection relations are formed, the application range is wider, and the adaptable environment is more.
Most preferably, in the heating assembly, the conductive part is connected with the heating part of the heating unit to form a passage, and the connection part is connected in series between the heating parts; the preferred connection mode is more concentrated in the heat of portion that generates heat, and the temperature of connecting portion disconnection is closer to the temperature that generates heat, and the anti-dry combustion method effect is better.
Among them, preferred; the melting point of the heating part is more than 120 ℃; the melting point of the connecting part is less than 120 ℃; most preferably, the heating part is one of an iron-chromium-aluminum alloy wire, a nichrome wire or a copper-nickel alloy wire; the heating efficiency of the optimized heating part is high, and the electrothermal conversion efficiency is high; the connecting part is an aluminum ladder alloy wire, is a preferable connecting part, and has low melting point and good sensitivity to temperature.
Furthermore, the utility model also provides a battery pack, which comprises a battery module and the dry heating preventing film, wherein the dry heating preventing film is adhered to the battery module.
The battery pack containing the dry heating prevention heating film can not influence the heating function of the heating film under the condition of ensuring the safety of the battery pack after the dry heating of the heating film is caused under various conditions, thereby changing the working environment of the battery pack and reducing the electric performance of the battery pack; the conditions that cause dry burning of the heating film include: (1) During the sticking process of the heating film, folds appear, so that the local temperature is too high, and dry burning appears; (2) When the heating bag is used, the heating film is stressed, so that the heating film is tilted, and dry burning occurs; (3) When the double faced adhesive tape fails, the heating film can fall off, and dry burning occurs.
In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:
1. according to the dry-heating-preventing heating film, the heating parts and the connecting parts in the heating units are designed into conductive materials with different melting points by utilizing the characteristics of different melting points of different metal materials, so that after the heating units are dry-heated, the connecting materials with low melting points can be fused when the temperature is greatly increased, the heating units are broken, heating is stopped, and thermal runaway accidents are avoided.
2. The heating component of the dry heating prevention heating film is designed to be formed by connecting a plurality of heating units in parallel, so that after one or a part of heating units of the heating component are melted due to temperature rise, the heating of other heating units can not be influenced, the heating film still has a heating function, and the probability of stopping the battery heating system is greatly reduced.
3. The dry heating prevention film has the advantages of simple structure, good universality and wide application range, has positive effects on improving the working performance of the battery, and is suitable for large-scale application in a battery heating system.
4. According to the battery pack, after the heating film is dried under various conditions, the heating function of the heating film is still not affected under the condition that the safety of the battery pack is ensured, so that the working environment of the battery pack is changed, and the electric performance of the battery pack is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the heating film for preventing dry heating in embodiment 1 of the present utility model;
FIG. 2 is a schematic diagram of the structure of the heating film for preventing dry heating in embodiment 2 of the present utility model;
FIG. 3 is a schematic view showing the three-dimensional structure of the heating film for preventing dry heating in embodiment 3 of the present utility model;
FIG. 4 is a schematic plan view of a dry heating preventing film according to embodiment 3 of the present utility model;
the marks in the figure: 1-an insulating layer; 2-heating core plates; 3-conductive parts; 4-a heating unit; 401-a heat generating part; 402-a connection; 5-conducting wires; 6-heating assembly.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1
The dry heating prevention heating film is composed of an insulating layer 1 and a heating core plate 2 as shown in figure 1; the heating core plate 2 consists of 1 heating component 6 and a wire 5; the heating component 6 is composed of a lead 5, a conductive part 3 and 4 heating units 4 connected in parallel between the conductive parts 3, wherein the heating units 4 and the conductive parts 3 form a passage, and the lead 5 is connected with the conductive parts 3 of the heating component 6 and forms a passage; the heating unit 1 is formed by connecting a 1-section heating part 401 and a 1-section connecting part 402 in series, wherein one end of the heating part 401 is connected with a conductive part 3 to form a passage, the other end of the heating part is connected with the connecting part 402, one end of the connecting part 402 is connected with the conductive part 3 to form a passage, and the other end of the connecting part is connected with the heating part 401; the heating part 401 is an iron-chromium-aluminum alloy wire; the connection 402 is an aluminum ladder alloy wire.
In the working process of the heating film, after the dry heating temperature of any heating unit 4 in the heating assembly 6 is increased, when the temperature is higher than the melting point of the connecting part 402 in the corresponding heating unit 4, the connecting part 402 is fused, so that the heating unit 4 is powered off, the heating part 401 stops heating immediately, and the temperature is reduced; meanwhile, the other three heating units 4 still continue to heat.
Example 2
The dry heating prevention heating film is composed of an insulating layer 1 and a heating core plate 2 as shown in fig. 2; the heating core plate 2 consists of 1 heating component 6 and a wire 5; the heating component 6 is composed of a conductive part 3 and 4 heating units 4 connected in parallel between the conductive parts 3, the heating units 4 and the conductive part 3 form a passage, and the lead 5 is connected with the conductive part 3 of the heating component 6 and forms a passage; the heating unit 1 is formed by connecting 2 sections of heating parts 401 and 1 section of connecting parts 402 in series, the connecting parts 402 are connected between the 2 sections of heating parts 401, and one ends of the 2 sections of heating parts 401 are respectively connected with the conductive parts 3; the heating part 401 is a nichrome wire; the connection 402 is an aluminum ladder alloy wire.
In the working process of the heating film, after the dry heating temperature of any heating unit 4 in the heating assembly 6 is increased, when the temperature is higher than the melting point of the connecting part 402 in the corresponding heating unit 4, the connecting part 402 is fused, so that the heating unit 4 is powered off, the heating part 401 stops heating immediately, and the temperature is reduced; meanwhile, the other three heating units 4 still continue to heat.
Example 3
The dry heating prevention heating film is composed of an insulating layer 1 and a heating core plate 2 as shown in fig. 3 and 4; the heating core plate 2 is composed of 6 heating components 6 and wires 5, and the 6 heating components 6 are sequentially connected in series; the heating component 6 is composed of a conductive part 3 and 4 heating units 4 connected in parallel between the conductive parts 3, the heating units 4 and the conductive parts 3 form a passage, and the wires 5 are connected with the conductive parts 3 of the heating component 6 at two ends of the heating core plate 2 and form a passage; the heating unit 1 is formed by connecting 2 sections of heating parts 401 and 1 section of connecting parts 402 in series, the connecting parts 402 are connected between the 2 sections of heating parts 401, and one ends of the 2 sections of heating parts 401 are respectively connected with the conductive parts 3; the heating part 401 is a copper-nickel alloy wire; the connection 402 is an aluminum strip alloy wire.
In the working process of the heating film, after the dry heating temperature of any heating unit 4 in any heating assembly 6 is increased, when the temperature is higher than the melting point of the connecting part 402 in the corresponding heating unit 4, the connecting part 402 is fused, so that the heating unit 4 is powered off, the heating part 401 stops heating immediately, and the temperature is reduced; meanwhile, the other three heating units 4 still continue to heat, and the 6 heating assemblies 6 can still continue to heat.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (11)
1. The dry heating prevention heating film is characterized by comprising an insulating layer (1) and a heating core plate (2); the heat-generating core plate (2) comprises at least 1 heating component (6); the heating component (6) comprises a conductive part (3) and at least 2 heating units (4) connected in parallel between the conductive parts (3), and the heating units (4) and the conductive parts (3) form a passage; the heating unit (4) is formed by connecting a heating part (401) and a connecting part (402) in series to form a passage; the melting point of the heating part (401) is greater than that of the connecting part (402).
2. The dry heating preventing film according to claim 1, wherein the insulating layer (1) is an insulating film or an insulating coating.
3. The dry heating preventing film according to claim 2, wherein the insulating layer (1) is a polyimide film.
4. The dry heat prevention heating film according to claim 1, wherein the heat generation core plate (2) includes at least 2 heating elements (6) and is formed in series to form a passage.
5. The dry heating prevention film according to claim 1, wherein the heat generating core board (2) further comprises a wire (5); the wire (5) is connected to the conductive part (3) of the heating element (6) and forms a path.
6. The dry heating preventing film according to claim 1, wherein in the heating module (6), the conductive portion (3) is connected to and forms a path with the heat generating portion (401) and/or the connecting portion (402) of the heat generating unit (4).
7. The dry heating prevention film according to claim 6, wherein in the heating module (6), the conductive part (3) is connected with the heat generating part (401) of the heat generating unit (4) and forms a passage, and the connection part (402) is connected in series between the heat generating parts (401).
8. The dry heating prevention film according to claim 1, wherein the melting point of the heat generating portion (401) is more than 120 ℃ and the melting point of the connecting portion (402) is less than 120 ℃.
9. The dry heating prevention film according to claim 8, wherein the heat generating portion (401) is one of an iron-chromium-aluminum alloy wire, a nichrome wire, or a copper-nickel alloy wire.
10. The dry heat prevention film according to claim 8, wherein the connection portion (402) is an aluminum ladder alloy wire.
11. A battery pack comprising a battery module and the dry heat prevention heating film according to any one of claims 1 to 10, the dry heat prevention heating film being attached to the battery module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222699177.8U CN218919058U (en) | 2022-10-13 | 2022-10-13 | Dry heating prevention heating film and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222699177.8U CN218919058U (en) | 2022-10-13 | 2022-10-13 | Dry heating prevention heating film and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218919058U true CN218919058U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222699177.8U Active CN218919058U (en) | 2022-10-13 | 2022-10-13 | Dry heating prevention heating film and battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218919058U (en) |
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2022
- 2022-10-13 CN CN202222699177.8U patent/CN218919058U/en active Active
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