CN209766601U - Battery pack thermal management system based on flat heat pipe - Google Patents
Battery pack thermal management system based on flat heat pipe Download PDFInfo
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- CN209766601U CN209766601U CN201920468080.1U CN201920468080U CN209766601U CN 209766601 U CN209766601 U CN 209766601U CN 201920468080 U CN201920468080 U CN 201920468080U CN 209766601 U CN209766601 U CN 209766601U
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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 relates to the field of power battery thermal management, and discloses a battery pack thermal management system based on a flat heat pipe, which comprises a battery pack, a flat heat pipe, a U-shaped graphite sheet and a heat exchange plate; the battery pack comprises a plurality of square single batteries, and the U-shaped graphite sheets correspond to the single batteries one by one; the U-shaped graphite sheet at least covers two opposite side surfaces of the single battery to form a battery unit, and the plurality of battery units are sequentially attached to form a battery module; the plurality of heat exchange plates are arranged at intervals in sequence, the battery module is arranged in the interval between two adjacent heat exchange plates along the length direction of the battery module, and the flat heat pipe is positioned between the battery module and the heat exchange plates. The beneficial effects are that: the system has simple and compact structure and small occupied area, and can effectively improve the uniformity of the internal temperature of the battery pack while efficiently radiating/heating the battery pack.
Description
Technical Field
The utility model relates to a power battery heat management field, concretely relates to group battery heat management system based on dull and stereotyped heat pipe.
background
As a main power source of the electric vehicle, parameters and performance of the battery directly affect the power, safety and economy of the electric vehicle. The battery can generate heat during working, so that the temperature of the battery is increased, and the voltage of the battery is changed and thermal runaway is caused; in cold areas in winter, the battery capacity, power and charge-discharge efficiency are reduced due to the fact that the battery temperature is too low, and the endurance mileage and the maximum speed of the electric automobile are greatly reduced. The temperature of the battery pack is not uniform, so that the discharge of the battery pack is not uniform, and the local temperature difference of the single battery even causes the phenomena of pressure difference, mechanism expansion and the like. Therefore, the research on efficient battery thermal management technology is particularly important for improving the performance of the electric automobile.
The heat pipe or the cold water pipeline is contacted with the battery to be used as a common heat dissipation means for battery heat management, and the heat generated by the battery is absorbed, so that the heat exchange area is extremely limited, the heat exchange is concentrated, and the temperature distribution in the single battery is uneven. When the battery is heated, a phenomenon in which the temperature difference is increased due to the concentration of heating also occurs.
SUMMERY OF THE UTILITY MODEL
the utility model aims at overcoming the not enough of above prior art existence, provide a group battery thermal management system based on dull and stereotyped heat pipe, when aiming at carrying out high-efficient heat dissipation/heating to battery cell, guarantee the homogeneity of group battery temperature.
The purpose of the utility model is realized through the following technical scheme: a battery pack thermal management system based on a flat heat pipe comprises a battery pack, the flat heat pipe, a U-shaped graphite sheet and a heat exchange plate with a circulating flowing working medium inside; the battery pack comprises a plurality of square single batteries, the U-shaped graphite sheets correspond to the single batteries one by one, the U-shaped graphite sheets at least cover two opposite side surfaces of the single batteries to form a battery unit, and the plurality of battery units are sequentially attached to form a battery module; the two side plates of each U-shaped graphite sheet are parallel to the length direction of the battery module, the heat exchange plates are sequentially arranged at intervals, the battery module is arranged in the interval between two adjacent heat exchange plates along the length direction of the battery module, the flat heat pipe is positioned between the battery module and the heat exchange plates, one side surface of the flat heat pipe is tightly attached to the U-shaped graphite sheet, and the other side surface of the flat heat pipe is tightly attached to the heat exchange plates.
Further, the size of two side plates of the U-shaped graphite sheet is matched with the two opposite sides of the single battery, so that the two side plates of the U-shaped graphite sheet completely cover the two opposite sides of the single battery, and the two side plates of the U-shaped graphite sheet are parallel to the length direction of the battery module.
Furthermore, the U-shaped graphite sheet completely covers three adjacent side faces of the single battery, wherein two side faces are arranged oppositely, the two side faces are parallel to the length direction of the battery module, the other side face is perpendicular to the length direction of the battery module, the U-shaped graphite sheet is provided with an open end and a closed end which are opposite, and in the same battery module, the open end of the U-shaped graphite sheet is attached to the back of the closed end of the U-shaped graphite sheet adjacent to the open end of the U-shaped graphite sheet, so that the four side faces of the single battery are all attached to the U-shaped graphite sheet.
Furthermore, a plurality of circulation flow channels are arranged in the heat exchange plate, and each circulation flow channel is provided with a working medium inlet and a working medium outlet which are arranged oppositely.
Furthermore, the circulating flow channel comprises at least two parallel flow channels, the parallel flow channels are connected in parallel, one end of each parallel flow channel is connected with the working medium inlet, and the other end of each parallel flow channel is connected with the working medium outlet.
Further, the flat heat pipe is a sintered wick-type vapor cavity flat heat pipe with a support column inside.
Further, the battery module is of a cuboid structure.
Furthermore, heat-conducting silica gel is coated between the flat heat pipe and the U-shaped graphite sheet and between the flat heat pipe and the heat exchange plate.
A working method of a battery pack thermal management system based on a flat heat pipe comprises the following steps,
The heat dissipation process: when the working temperature of the battery pack is overhigh, the working medium which circularly flows in the heat exchange plate is a cooling working medium, and the heat generated by the single battery is transmitted to the heat exchange plate through the U-shaped graphite sheet and the flat plate heat pipe in sequence; meanwhile, a cooling working medium flows in from the working medium inlet, absorbs heat and then flows out from the working medium outlet, so that the battery pack is cooled; in the heat dissipation process, one side of the flat heat pipe, which is in contact with the U-shaped graphite sheet, is a heat absorption surface, and one side of the flat heat pipe, which is in contact with the heat exchange plate, is a heat release surface;
Heating process: when the battery pack works in a low-temperature environment, the working medium which circularly flows in the heat exchange plate is a heating working medium which is used as a heat source, flows in from the working medium inlet, and flows out from the working medium outlet after heat is released; meanwhile, heat is transmitted to the battery pack through the heat exchange plate, the flat heat pipe and the U-shaped graphite sheet in sequence, so that the battery pack is heated; in the heating engineering, one side of the flat heat pipe, which is in contact with the heat exchange plate, is a heat absorption surface, and one side of the flat heat pipe, which is in contact with the U-shaped graphite sheet, is a heat release surface.
Further, the cooling working medium is water or an ethylene glycol aqueous solution, and the heating working medium is water or an ethylene glycol aqueous solution.
Compared with the prior art, the utility model have following advantage:
1. the utility model discloses a group battery thermal management system, its simple structure, compactness, area is little, arranges convenient nimble and security height, and manufacturing cost is lower. With graphite flake, dull and stereotyped heat pipe and the combination of heat transfer board three, on the basis of graphite flake, combine the characteristics that dull and stereotyped heat pipe heat transfer area is big, heat transfer performance is strong for group battery temperature distributes evenly, and the direct contact heat transfer board is not directly contacted to the battery cell moreover, effectively avoids the weeping danger, has improved battery thermal management system's security greatly.
2. The utility model provides a cell all around by the graphite flake cladding, graphite has good plasticity and toughness, and is frivolous, and thermal conductivity is strong, adopts graphite as the heat conduction material, is favorable to thermal even conduction, effectively improves the homogeneity of group battery temperature.
3. the flat heat pipe in the utility model is a sintered wick-absorbing type steam cavity flat heat pipe with a support column inside; compared with the common heat pipe, the flat structure of the heat pipe can be better contacted with the graphite sheet and the heat exchange plate; the support columns made of the sintered powder in the heat pipes can effectively improve the rigidity and the critical heat flow density of the flat heat pipe, and not only can provide auxiliary liquid circulation channels, but also can provide additional heat conduction channels, so that the thermal resistance is reduced, and the heat exchange efficiency is improved; the working medium in the flat heat pipe uniformly transfers heat in a phase change mode in the steam cavity, so that the surface temperature of the flat heat pipe is uniform, and the temperature uniformity of the battery pack is improved.
4. The utility model provides a parallel flow path in the heat transfer board arranges simply, and the in-process resistance that flows is less at the flow, and energy loss is less, is favorable to reducing the secondary energy consumption among the thermal management system. The utility model discloses in the material energy-concerving and environment-protective of adoption, simple installation, easy to maintain can solve the heat transfer demand of square group battery under different operating condition, guarantee that the battery carries out work at suitable temperature range, have wide application prospect.
Drawings
Fig. 1 shows a schematic structural diagram of a flat heat pipe based battery pack thermal management system according to the present invention;
FIG. 2 shows a top view of FIG. 1;
FIG. 3 shows an exploded view at A in FIG. 2;
Fig. 4 shows a schematic structural diagram of the attachment of a U-shaped graphite sheet to a single battery according to the present invention;
fig. 5 shows a schematic structural view of a heat exchanger plate according to the present invention;
Fig. 6 shows a schematic flow diagram of a flowing medium in a middle circulation flow channel according to the present invention;
In the figure, 1 is a U-shaped graphite sheet; 101 is an opening end; 102 is a closed end; 2 is a battery pack; 201 is a single battery; 3 is a flat heat pipe; 4 is a heat exchange plate; 401 is a circulating flow channel; 402 is a working medium inlet; 403 is a working medium outlet; 404 are parallel flow channels.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Example (b):
The battery pack thermal management system based on the flat heat pipe shown in fig. 1-3 comprises a battery pack 2, a flat heat pipe 3, a U-shaped graphite sheet 1 and a heat exchange plate 4 with a circulating flowing working medium inside; the battery pack 2 comprises a plurality of square single batteries 201, the U-shaped graphite sheets 1 correspond to the single batteries 201 one by one, the U-shaped graphite sheets 1 at least cover two opposite side surfaces of the single batteries 201 to form a battery unit, the battery units are sequentially attached to form a battery module, two side plates of the U-shaped graphite sheets 1 are parallel to the length direction of the battery module, (namely, the two side plates of the U-shaped graphite sheets 1 are sequentially arranged along the length direction of the battery module) a plurality of heat exchange plates 4 are sequentially arranged at intervals, the battery module is arranged in the interval of two adjacent heat exchange plates 4 along the length direction of the battery module, the flat heat pipe 3 is positioned between the battery module and the heat exchange plates 4, one side surface of the flat heat pipe 3 is tightly attached to the U-shaped graphite sheets 1, and the other side surface of the flat heat pipe is tightly attached to the heat exchange plates. U type graphite flake 1 and the laminating of dull and stereotyped heat pipe 3 of monomer battery 201 both sides, U type graphite flake 1 is through dull and stereotyped heat pipe 3 and heat transfer board 4 indirect contact, adopts this structure effectively to avoid the safety problem because of runner working medium leaks and leads to in the heat transfer board 4. The adjacent battery modules adopt the same heat exchange plate 4 for heat exchange, so that the system has simple and compact structure and small occupied area. When the temperature of the battery pack 2 is high, the heat generated by the single battery 201 is transferred to the flat heat pipe 3 through the U-shaped graphite sheet 1, and then the cooling working medium flowing in the heat exchange plate 4 takes away the heat, so that the temperature of the battery pack 2 is reduced; when the working environment temperature of the battery pack 2 is low, a heating working medium flows in the heat exchange plate 4, the heat of the heating working medium is transmitted to the single battery 201 through the flat heat pipe 3 and the U-shaped graphite sheet 1, and the battery pack 2 is heated. The design is convenient and flexible to arrange, high in safety and capable of ensuring that the single battery 201 works within a proper temperature range.
The size of the two side plates of the U-shaped graphite sheet 1 is matched with the two opposite side surfaces of the single battery 201, so that the two side plates of the U-shaped graphite sheet 1 completely wrap the two opposite side surfaces of the single battery 201, and the two side plates of the U-shaped graphite sheet are parallel to the length direction of the battery module. By adopting the structure, the heat exchange efficiency between the U-shaped graphite sheet 1 and the single battery 201 can be improved, and the temperature uniformity of the single battery 201 is improved.
As shown in fig. 3 and 4, the volume of the U-shaped graphite sheet 1 is equal to the volume of the single battery 201, so that the U-shaped graphite sheet 1 completely covers three adjacent side surfaces of the single battery 201, two of the side surfaces are oppositely arranged and are parallel to the length direction of the battery module, the other side surface is perpendicular to the length direction of the battery module, the U-shaped graphite sheet 1 has an open end 101 and a closed end 102 which are opposite, and in the same battery module, the open end 101 of the U-shaped graphite sheet 1 is attached to the back of the closed end 102 of the adjacent U-shaped graphite sheet 1, so that four side surfaces of the single battery 201 are attached to the U-shaped graphite sheet 1. Adopt this structure, four sides of battery cell 201 are all encircleed by U type graphite flake 1, and each other contactless between the adjacent battery cell 201 is favorable to reducing the influence of each other between the adjacent battery cell 201. Meanwhile, the U-shaped graphite sheet 1 has good heat-conducting property, which is beneficial to reducing the temperature difference between the single batteries 201 and maintaining the temperature uniformity of the battery pack 2.
As shown in fig. 5, the heat exchange plate 4 has a plurality of circulation channels 401 inside, and each circulation channel 401 has a working medium inlet 402 and a working medium outlet 403 which are oppositely arranged. The arrangement of the plurality of circulation flow channels 401 can improve the uniformity of the distribution of the flowing medium in the heat exchange plate 4, thereby improving the heat exchange efficiency of the whole system.
As shown in fig. 5 and 6, the circulation flow channel 401 includes three parallel flow channels 404, each of the parallel flow channels 404 is connected in parallel, one end of each of the parallel flow channels 404 is connected to the working medium inlet 402, and the other end of each of the parallel flow channels 404 is connected to the working medium outlet 403. The parallel runners 404 are arranged in parallel, and the parallel runners 404 are rectangular, so that the design is reasonable, the structure is simple, the resistance of the flowing working medium in the flowing process is small, the energy loss is small, and the reduction of secondary energy consumption in the heat management system is facilitated.
The flat heat pipe 3 is a sintered wick-absorbing type vapor cavity flat heat pipe with a support column inside. The flat heat pipe 3 with the steam cavity has strong heat transfer capacity in the normal direction of the flat plate, is favorable for uniformly transferring heat generated by a heat source on the whole flat plate, can effectively eliminate hot spots and improves the heat exchange effect; the flat plate structure of the flat plate heat pipe 3 is easy to contact with the U-shaped graphite sheet 1 and the heat exchange plate 4, and the installation of the system is simplified. Such flat heat pipes 3 are commercially available.
The battery module is of a cuboid structure. The battery module with the cuboid structure is matched with the flat plate structure of the flat plate heat pipe 3, the whole system is compact in structure, and the heat exchange efficiency is effectively improved.
And heat-conducting silica gel is coated between the flat heat pipe 3 and the U-shaped graphite sheet 1 and between the flat heat pipe 3 and the heat exchange plate 4. The arrangement can reduce thermal resistance and improve the heat exchange efficiency of the system.
A working method of a battery pack thermal management system based on a flat heat pipe comprises the following steps,
The heat dissipation process: when the working temperature of the battery pack 2 is too high, the working medium which circularly flows in the heat exchange plate 4 is a cooling working medium, and the heat generated by the single battery 201 is transmitted to the heat exchange plate 4 through the U-shaped graphite sheet 1 and the flat heat pipe 3 in sequence; meanwhile, a cooling working medium flows in from the working medium inlet 402, absorbs heat and then flows out from the working medium outlet 403, so that the battery pack 2 is cooled; in the heat dissipation process, one side of the flat heat pipe 3, which is in contact with the U-shaped graphite sheet 1, is a heat absorption surface, and one side of the flat heat pipe 3, which is in contact with the heat exchange plate 4, is a heat release surface;
Heating process: when the battery pack 2 works in a low-temperature environment, the working medium which circularly flows in the heat exchange plate 4 is a heating working medium which is used as a heat source, flows in from the working medium inlet 402, emits heat and then flows out from the working medium outlet 403; meanwhile, heat is transmitted to the battery pack 2 through the heat exchange plate 4, the flat heat pipe 3 and the U-shaped graphite sheet 1 in sequence, so that the battery pack 2 is heated; in the heating engineering, one side of the flat heat pipe 3, which is in contact with the heat exchange plate 4, is a heat absorption surface, and one side of the flat heat pipe 3, which is in contact with the U-shaped graphite sheet 1, is a heat release surface.
The cooling working medium is water or an ethylene glycol aqueous solution, and the heating working medium is water or an ethylene glycol aqueous solution. When the cooling device is used specifically, the cooling working medium is in a normal temperature state, and the heating working medium can be heated for use.
The above-mentioned specific implementation is the preferred embodiment of the present invention, can not be right the utility model discloses the limit, any other does not deviate from the technical scheme of the utility model and the change or other equivalent replacement modes of doing all contain within the scope of protection of the utility model.
Claims (8)
1. the utility model provides a group battery thermal management system based on flat heat pipe which characterized in that: the heat exchanger comprises a battery pack, a flat heat pipe, a U-shaped graphite sheet and a heat exchange plate with a circulating flowing working medium inside; the battery pack comprises a plurality of square single batteries, the U-shaped graphite sheets correspond to the single batteries one by one, the U-shaped graphite sheets at least cover two opposite side surfaces of the single batteries to form a battery unit, and the plurality of battery units are sequentially attached to form a battery module; the battery module is arranged in the interval between two adjacent heat exchange plates along the length direction of the battery module, the flat heat pipe is positioned between the battery module and the heat exchange plates, one side surface of the flat heat pipe is tightly attached to the U-shaped graphite sheet, and the other side surface of the flat heat pipe is tightly attached to the heat exchange plates.
2. The flat heat pipe based battery pack thermal management system of claim 1, wherein: the size of the two side plates of the U-shaped graphite sheet is matched with the two opposite side surfaces of the single battery, so that the two side plates of the U-shaped graphite sheet completely cover the two opposite side surfaces of the single battery, and the two side plates of the U-shaped graphite sheet are parallel to the length direction of the battery module.
3. The flat heat pipe based battery pack thermal management system of claim 1, wherein: the U type graphite flake totally wraps three adjacent sides of single battery, wherein two sides set up relatively, and these two sides are on a parallel with the length direction of battery module, the length direction of another side perpendicular to battery module, U type graphite flake has relative open end and blind end, and in same battery module, the open end of U type graphite flake is rather than the back laminating of the blind end of adjacent U type graphite flake to make four sides of single battery all laminate with U type graphite flake.
4. The flat heat pipe based battery pack thermal management system of claim 1, wherein: the heat exchange plate is internally provided with a plurality of circulation flow channels, and each circulation flow channel is provided with a working medium inlet and a working medium outlet which are oppositely arranged.
5. The flat heat pipe based battery pack thermal management system of claim 4, wherein: the circulating flow channel comprises at least two parallel flow channels, each parallel flow channel is connected in parallel, one end of each parallel flow channel is connected with the working medium inlet, and the other end of each parallel flow channel is connected with the working medium outlet.
6. The flat heat pipe based battery pack thermal management system of claim 1, wherein: the flat heat pipe is a sintered wick-absorbing type steam cavity flat heat pipe with a support column inside.
7. The flat heat pipe based battery pack thermal management system of claim 1, wherein: the battery module is of a cuboid structure.
8. The flat heat pipe based battery pack thermal management system of claim 1, wherein: and heat-conducting silica gel is coated between the flat heat pipe and the U-shaped graphite sheet and between the flat heat pipe and the heat exchange plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920468080.1U CN209766601U (en) | 2019-04-09 | 2019-04-09 | Battery pack thermal management system based on flat heat pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920468080.1U CN209766601U (en) | 2019-04-09 | 2019-04-09 | Battery pack thermal management system based on flat heat pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010995A (en) * | 2019-04-09 | 2019-07-12 | 华南理工大学 | A kind of battery pack thermal management system and its working method based on flat-plate heat pipe |
| CN115548504A (en) * | 2021-06-30 | 2022-12-30 | 比亚迪股份有限公司 | Battery cold plate and battery system |
-
2019
- 2019-04-09 CN CN201920468080.1U patent/CN209766601U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010995A (en) * | 2019-04-09 | 2019-07-12 | 华南理工大学 | A kind of battery pack thermal management system and its working method based on flat-plate heat pipe |
| CN115548504A (en) * | 2021-06-30 | 2022-12-30 | 比亚迪股份有限公司 | Battery cold plate and battery system |
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