CN219610547U - Heat radiation structure and battery module - Google Patents
Heat radiation structure and battery module Download PDFInfo
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- CN219610547U CN219610547U CN202320278474.7U CN202320278474U CN219610547U CN 219610547 U CN219610547 U CN 219610547U CN 202320278474 U CN202320278474 U CN 202320278474U CN 219610547 U CN219610547 U CN 219610547U
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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 heat radiation structure, which comprises a first heat radiation layer and a second heat radiation layer, wherein the first heat radiation layer plays a role of supporting the second heat radiation layer; an end plate; a cover plate; the FPCA board is arranged at the upper ends of the plurality of cell assemblies and is used for converging electric quantity. The utility model has compact and reasonable structure and convenient operation, and can be widely applied to the structure design of the soft package battery and the design scheme of the module. The soft package battery core designed by the utility model can reduce the harm of thermal runaway of the battery, and meanwhile, the high integration efficiency is achieved on the module and system grouping scheme, and the problems of light weight and thermal management of high energy density and high power application scenes are solved.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a heat dissipation structure and a battery module.
Background
With the proposal of a carbon neutralization target and the great development of new energy industries, a lithium ion battery is widely focused as a clean energy, and the use proportion of the lithium ion battery in new energy automobiles, energy storage, military special fields and the like is larger and larger, but a plurality of problems are brought about at the same time, such as: the problems of poor battery endurance, easy ignition and the like are solved, in terms of battery endurance, the light weight of the battery is a key for prolonging the endurance mileage of the new energy automobile, and the improvement of the heat dissipation capacity of the battery is beneficial to improving the ignition problem of the battery.
Based on the above, we propose a heat dissipation structure and a high-light-weight and high-heat dissipation battery module comprising the heat dissipation structure.
Disclosure of Invention
The present inventors have provided a battery module to solve the problems of light weight and thermal management in high energy density and high power application scenarios, aiming at the drawbacks of the prior art.
The technical scheme adopted by the utility model is as follows:
a heat dissipation structure comprises a first heat dissipation layer and a second heat dissipation layer.
In a preferred embodiment, the relationship between the thickness d1 of the first heat dissipation layer and the thickness d2 of the second heat dissipation layer is d1 > d2, and the first heat dissipation layer functions as a support for the second heat dissipation layer.
The thickness d1 of the first heat dissipation layer is less than or equal to 0.4mm.
The thickness d2 of the second heat dissipation layer is less than or equal to 0.1mm.
The second heat dissipation layer faces the battery core.
In a preferred embodiment, the first heat sink layer and the second heat sink layer are the same size.
The heat dissipation performance of the second heat dissipation layer is better than that of the first heat dissipation layer.
In an alternative embodiment, the first heat dissipation layer is an aluminum layer, and the second heat dissipation layer is a graphite layer.
The heat dissipation structure comprises a first plane which is in contact with the battery cell and/or the foam, and the length and the width of the first plane are equal to or larger than the length and the width corresponding to the battery cell.
In one embodiment, the heat dissipation structure further comprises a first extension structure and/or a second extension structure extending along the thickness direction of the battery cell, which is beneficial to protecting the battery cell and conducting heat quickly.
In one embodiment, the heat dissipation structures are arranged between the battery cells at intervals and function to transfer heat inside the battery cells to the surface of the battery cell assembly.
In a preferred embodiment, when the heat dissipation structure is disposed between two electrical cores, the heat dissipation structure includes a first heat dissipation layer and two second heat dissipation layers disposed on both sides of the first heat dissipation layer.
In another embodiment, when the heat dissipation structure is disposed between two electrical cells, two heat dissipation structures are disposed between the two electrical cells.
In a preferred embodiment, when two heat dissipation structures are disposed between the cells, the two heat dissipation structures are disposed between the cells and the foam, respectively, i.e., in a cell/heat dissipation structure/foam/heat dissipation structure/cell structure.
In one embodiment, the heat dissipation structure is matched with the battery cell and the foam to achieve the heat dissipation structure/battery cell/foam/battery cell/heat dissipation structure.
In one embodiment, the heat dissipation structures are respectively arranged at two sides of the battery cell assembly.
In another aspect, the present utility model provides a high-weight, high-heat-dissipation battery module using the heat-dissipation structure as described above, comprising: the battery cells are stacked side by side to form a battery cell assembly, and the battery cells are electrically connected together in a parallel or serial mode; the heat dissipation structures are arranged at two sides and inside the battery cell assembly; end plates arranged at the head and tail ends of the plurality of cell assemblies; cover plates arranged at the upper and lower ends of the multiple cell assemblies; the FPCA board is arranged at the upper ends of the plurality of battery cell assemblies and used for converging electric quantity and collecting battery cell voltage and temperature in real time.
It is further characterized by:
a protection plate is clamped between the end plate and the battery cell assembly, and the protection plate is made of flame-retardant materials.
The battery cell module further comprises plastic covers which are arranged at the upper ends and the lower ends of the plurality of battery cell assemblies, wherein the plastic covers are made of PET (polyethylene terephthalate) polyester films, PC (polycarbonate), PP (polypropylene) or PE (polyethylene) materials, and the FPCA plate is arranged in the plastic covers.
Be provided with a plurality of collection nickel pieces that link to each other with the positive and negative tab of electric core on the FPCA board, be connected with busbar and low pressure plug-in components respectively at the both ends of FPCA board simultaneously.
The battery cell assembly is internally provided with compressed foam.
The end plate is made of aluminum alloy, and the cover plate is made of aluminum alloy.
In one embodiment, the battery module binding bands are bound on the outer sides of the two end plates, so that the plurality of battery cell assemblies are tightly attached to form a whole, the number of the binding bands is two, and the two binding bands are arranged in an upper row and a lower row.
In other embodiments, the cells 210 are secured together by a bracket, bus bar, or the like.
The beneficial effects of the utility model are as follows:
the utility model has compact and reasonable structure and convenient operation, and can be widely applied to the structure design of the soft package battery and the design scheme of the module. The soft package battery core designed by the utility model can reduce the harm of thermal runaway of the battery, and meanwhile, the high integration efficiency is achieved on the module and system grouping scheme, and the problems of light weight and thermal management of high energy density and high power application scenes are solved.
Meanwhile, the utility model has the following advantages:
(1) And a plurality of heat dissipation structures are arranged on two sides and in the middle of the battery core assembly, so that the heat dissipation performance of the battery is greatly improved, the heat is rapidly diffused when the battery is prevented from thermal runaway, and the safety accident is avoided.
(2) The compression foam is made of PU materials, has the characteristics of heat preservation, heat insulation, sound absorption, shock absorption, flame retardance, static resistance, good air permeability and the like, can provide uniform bulge space for the soft-packaged battery core, improves better protection effect, and can reduce harm as much as possible through the design of the heat dissipation plate and the compression foam even if one of the battery cores is damaged and fires.
(3) The whole module is tied up in advance to the adoption twice bandage, guarantees structural stability, reserves the bandage simultaneously on the lateral wall of end plate and ties up the groove, prevents that the bandage from droing, better maintenance holistic stability.
(4) The module in this embodiment adopts the FPCA board to gather the board design widely used in new energy automobile trade, gathers electric core voltage, temperature in real time, on the basis of guaranteeing acquisition accuracy, and FPC design can satisfy module lightweight and volume requirement and easily arranges and afraid of deformation.
Drawings
Fig. 1 is a schematic diagram of a heat dissipation structure according to the present utility model.
Fig. 2 is an enlarged schematic view of a portion a in fig. 1.
Fig. 3 is a schematic view of a battery module according to the present utility model.
Wherein: 100. a heat dissipation structure; 110. a first heat dissipation layer; 120. a second heat dissipation layer; 111. a first plane; 112. a first extension structure; 113. a second extension structure;
200. a cell assembly; 210. a battery cell;
300. an end plate; 400. a cover plate; 500. an FPCA board; 600. and (5) protecting the plate.
Detailed Description
The following describes specific embodiments of the present utility model with reference to the drawings.
Since lithium ion batteries are widely commercialized, the safety problem of the lithium ion batteries is always concerned by the public, especially the problem of battery ignition frequently occurs, mainly because a large amount of accumulated heat in the batteries cannot be discharged rapidly, and because the batteries generally adopt a multi-cell stack composition, one cell is problematic, the adjacent cell is immediately affected, the accident rapidly spreads, and the thermal runaway is caused. Therefore, based on the above technical background, the utility model provides a heat dissipation structure for a lithium ion battery module, which can effectively solve the technical problem that heat in a battery cell is accumulated and cannot be rapidly discharged, and can effectively block heat from rapidly spreading in the battery cell assembly 200, so as to prevent the problem of a single battery cell from affecting the whole battery module.
As shown in fig. 1-2, the present embodiment discloses a heat dissipation structure 100, which includes a first heat dissipation layer 110 and a second heat dissipation layer 120.
In a preferred embodiment, the relationship between the thickness d1 of the first heat dissipation layer 110 and the thickness d2 of the second heat dissipation layer 120 is d1+_d2, and the first heat dissipation layer 110 plays a role of supporting the second heat dissipation layer 120.
The thickness d1 of the first heat dissipation layer 110 is less than or equal to 0.4mm. The thickness of the first heat dissipation layer 110 should not be too small to prevent weakening the supporting effect of the second heat dissipation layer 120.
Thickness d of the second heat dissipation layer 120 2 ≤0.1mm。
The second heat dissipation layer 120 faces the battery cell.
In a preferred embodiment, the first heat sink layer 110 and the second heat sink layer 120 are the same size.
The second heat dissipation layer 120 has better heat dissipation performance than the first heat dissipation layer 110.
In an alternative embodiment, the first heat dissipation layer 110 is an aluminum layer, and the second heat dissipation layer 120 is a graphite layer.
In this embodiment, the aluminum layer may be an aluminum alloy structure, and the graphite layer is coated on the surface of the aluminum alloy structure. In the prior art, a simple aluminum alloy structure is generally adopted as a heat dissipation structure, and a certain heat dissipation effect can be achieved, however, when the heat in the battery is rapidly accumulated in a large amount, the heat conductivity coefficient lambda of the aluminum alloy is generally 230W/m.K, the heat conductivity is insufficient to enable the heat to be rapidly diffused, and the problem of thermal runaway of the battery core cannot be effectively solved. In this embodiment, in order to further improve the heat dissipation effect on the battery cell 210, the graphite layer is coated as the heat dissipation structure of the second heat dissipation layer 120 under the support of the aluminum layer of the first heat dissipation layer 110, so that the battery cell 210 can be cooled on a large surface, wherein the heat conductivity coefficient λ of the heat dissipation structure coated with the heat conductive graphite layer can reach 1000-1W/m·k, and the heat conductivity coefficient is more than 5 times that of the conventional heat conductive aluminum plate. The minimum thickness of the graphite layer viscose state in this embodiment is 0.03mm, and the minimum thickness of ultra-thin state is 0.012mm, can smoothly attach on the aluminium layer, and both combination property is good, has both guaranteed higher heat dissipation ability, has also further alleviateed heat radiation structure's weight, is favorable to further realizing the lightweight of battery.
The heat dissipation structure 100 includes a first plane 111 in contact with the battery cell 210 and/or the foam, and the length and width of the first plane 111 are equal to or greater than the length and width of the battery cell.
In one embodiment, the heat dissipation structure 100 further includes a first extension structure 112 and/or a second extension structure 113 extending along the thickness direction of the battery cell, which is beneficial for protecting the battery cell and for rapid heat conduction.
The battery pack is subjected to heat management and sampling, and efficient heat conduction path design is adopted, heat is conducted to the surface of the battery module, and then temperature rise control is carried out by system heat management, so that the requirement of high heat generated by discharging at high multiplying power (at least 30C) can be met, and the high safety of the module is ensured.
In one embodiment, the heat dissipation structure 100 is disposed between the battery cells 210 at intervals, and functions to transfer heat from the inside of the battery cells 210 to the surface of the battery cell assembly 200.
In a preferred embodiment, when the heat dissipation structure 100 is disposed between two electrical cores 210, the heat dissipation structure includes a first heat dissipation layer 110 and two second heat dissipation layers 120 disposed on both sides of the first heat dissipation layer 110.
In another embodiment, when the heat dissipation structure 100 is disposed between two battery cells 210, two heat dissipation structures 100 are disposed between two battery cells 210.
In a preferred embodiment, when two heat dissipation structures 100 are disposed between the battery cells 210, the two heat dissipation structures 100 are disposed between the battery cells 210 and the foam, i.e., in a battery cell/heat dissipation structure/foam/heat dissipation structure/battery cell structure, respectively.
To save cost, in one embodiment, the heat dissipation structure 100 is configured as a heat dissipation structure/cell/foam/cell/heat dissipation structure in cooperation with the cell 210 and foam.
In one embodiment, the heat dissipation structures 100 are disposed on two sides of the battery cell assembly 200, respectively.
The embodiment also discloses a high light weight, high heat dissipation battery module that uses heat radiation structure as described above, includes: a plurality of battery cells 210 are stacked side by side to form a battery cell assembly 200, and the battery cells 210 are electrically connected together in a parallel or serial manner; the heat dissipation structures 100 are arranged at two sides and inside the battery cell assembly 200; end plates 300 arranged at the head and tail ends of the plurality of cell assemblies 200; cover plates 400 disposed on upper and lower sides of the plurality of cell assemblies 200; the FPCA board 500 is disposed at the upper ends of the plurality of battery cell assemblies 200 and is used for collecting electric quantity and collecting voltage and temperature of the battery cells in real time.
Further, the opposite sides of the two end plates 300 are further provided with protection plates 600, and the opposite sides of the two protection plates 600 are provided with a plurality of battery cell assemblies 200 which are attached side by side; the shielding plate 600 is made of a flame retardant material.
The battery cell assembly 200 is internally provided with compressed foam, and the compressed foam is made of PU materials and has the characteristics of heat preservation, heat insulation, sound absorption, shock absorption, flame retardance, static resistance, good air permeability and the like, so that a uniform bulge space can be provided for the battery cells 210 of the soft package, a better protection effect is improved, and even if one of the battery cells is damaged and fires, harm can be reduced as much as possible through the design of the heat dissipation plate and the compressed foam.
In one embodiment, the packaging mode of the module is that an open structure is bundled by an end plate 300 and binding bands, the number of the binding bands is two, and the two binding bands are arranged in an upper row and a lower row, so that the overall strength is improved.
The upper cover of a plurality of electric core assemblies 200 is equipped with same FPCA board 500, is provided with a plurality of collection nickel pieces that link to each other with the positive negative electrode ear of electric core 210 on the FPCA board 500, is connected with busbar and low pressure plug-in components respectively at the both ends of FPCA board 500 simultaneously, adopts the pretension of twice bandage to tie up whole module at last, guarantees structural stability, reserves the bandage groove of tying up on the lateral wall of end plate 300 simultaneously, prevents that the bandage from droing, better maintenance holistic stability.
In other embodiments, the cells 210 are secured together by a bracket, bus bar, or the like.
The upper end and the lower end of the module are also provided with plastic covers, and the plastic covers and the screw assemblies are used for sealing and fixing, so that the integrated effect is achieved, and in some embodiments, the plastic covers are made of PET (polyethylene terephthalate) polyester films, PC (polycarbonate), PP (polypropylene) or PE (polyethylene) materials, and the module has the advantages of stable size, straightness, excellent tearing strength, heat resistance, cold resistance, moisture resistance, water resistance, chemical resistance, super-strong insulating performance, and excellent electric, mechanical, heat resistance and chemical resistance.
The module in this embodiment adopts the FPCA board 500 that wide application is used in new energy automobile trade to gather the board design, gathers electric core 210 voltage, temperature in real time, on the basis of guaranteeing acquisition accuracy, and FPC design can satisfy module lightweight and volume requirement and easily arranges and be afraid of deformation.
The utility model can be widely applied to the structure design of soft package batteries and the design scheme of modules as a product design scheme. The soft package battery core designed by the utility model can reduce the harm of thermal runaway of the battery, and meanwhile, the high integration efficiency is achieved on the module and system grouping scheme, and the problems of light weight and thermal management of high energy density and high power application scenes are solved.
The above description is intended to illustrate the utility model and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the utility model.
Claims (8)
1. The heat dissipation structure is used in a battery module and is characterized by comprising a first heat dissipation layer and a second heat dissipation layer, wherein the second heat dissipation layer is arranged facing a battery cell;
thickness d of the first heat dissipation layer 1 Thickness d of the second heat dissipation layer 2 The relation of (2) is: d, d 1 ≥d 2 。
2. The heat dissipating structure of claim 1, wherein said first heat dissipating layer has a thickness d 1 ≤0.4mm；
Thickness d of the second heat dissipation layer 2 ≤0.1mm。
3. The heat dissipating structure of claim 2, wherein said second heat dissipating layer has a thickness d 2 ≤0.05mm。
4. The heat dissipating structure of claim 1 wherein the first heat dissipating layer is an aluminum layer and the second heat dissipating layer is a graphite layer.
5. A heat dissipating structure as defined in claim 1, wherein said heat dissipating structure comprises a first plane in contact with the cells and/or foam, and wherein said first plane has a length and width equal to or greater than a corresponding length and width of the cells.
6. The heat dissipating structure of claim 5, further comprising a first extension structure and/or a second extension structure extending in a thickness direction of the cell.
7. A battery module comprising the heat dissipation structure as recited in claim 1.
8. The battery module according to claim 7, further comprising: the battery cells are stacked side by side to form a battery cell assembly, and the battery cells are electrically connected together in a parallel or serial mode;
end plates arranged at the head and tail ends of the plurality of cell assemblies;
cover plates arranged at the upper and lower ends of the multiple cell assemblies;
the FPCA board is arranged at the upper ends of the plurality of battery cell assemblies and used for converging electric quantity and collecting battery cell voltage and temperature in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320278474.7U CN219610547U (en) | 2023-02-21 | 2023-02-21 | Heat radiation structure and battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320278474.7U CN219610547U (en) | 2023-02-21 | 2023-02-21 | Heat radiation structure and battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219610547U true CN219610547U (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320278474.7U Active CN219610547U (en) | 2023-02-21 | 2023-02-21 | Heat radiation structure and battery module |
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| CN (1) | CN219610547U (en) |
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- 2023-02-21 CN CN202320278474.7U patent/CN219610547U/en active Active
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