CN110943265B - Preparation of battery thermal management device coupled with novel bionic heat pipe and bidirectional heat flow control method - Google Patents
Preparation of battery thermal management device coupled with novel bionic heat pipe and bidirectional heat flow control method Download PDFInfo
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- CN110943265B CN110943265B CN201910400310.5A CN201910400310A CN110943265B CN 110943265 B CN110943265 B CN 110943265B CN 201910400310 A CN201910400310 A CN 201910400310A CN 110943265 B CN110943265 B CN 110943265B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 26
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- 239000010949 copper Substances 0.000 claims description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
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- 238000009833 condensation Methods 0.000 claims description 8
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- 230000003247 decreasing effect Effects 0.000 claims 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 2
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6552—Closed pipes transferring heat by thermal conductivity or phase transition, e.g. heat pipes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
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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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- Manufacturing & Machinery (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a composite battery thermal management device prepared by applying novel bionic plant super-hydrophilic characteristics and a bidirectional heat flow control method thereof. The bionic heat pipe heat collection is in solid-solid contact heat exchange with the battery, and the bionic heat pipe heat collection is in direct contact with the bottom-placed cold/hot plate at the bottom, so that heat transfer between the battery and the bottom-placed cold/hot plate is realized. Meanwhile, when the battery is changed from a cooling working condition to a preheating working condition, the cold and hot ends of the bionic heat pipe collector are adaptively converted along with the change of the state of the underlying cold/hot plate. The method overcomes the defect that the prior gravity type heat pipe cannot realize thermodynamic cycle and self-adaptive adjustment of the cold end and the hot end due to the fact that liquid at the cold end is not lifted to the hot end by virtue of capillary force, greatly improves the high-efficiency cooling capacity of the battery pack under the high-temperature environment and the severe working condition and the rapid preheating capacity of the battery pack under the cold low-temperature environment, and ensures the optimal working temperature, power output, cycle life and thermal safety of the battery pack of the electric automobile.
Description
Technical Field
The invention belongs to the field of thermal management of power batteries of electric automobiles, and particularly relates to a high-efficiency heat exchange device of a power battery and a thermal management control method.
Background
With the rapid development of electric vehicles, the specific energy of the battery of the electric vehicles is gradually increased, and meanwhile, the heat generation of the battery is rapidly improved due to high-temperature climate and severe working conditions. In addition, some safety problems caused by insufficient cooling capacity of the battery are also of great concern, so that corresponding battery thermal management technology is urgently needed to be improved and perfected. The reasonable thermal management of the power battery is not only a basic condition for normal driving, but also a necessary guarantee of life safety of passengers. In the prior battery heat exchange, liquid cooling is used as a most common heat exchange mode, so that the basic heat exchange requirement of the battery can be met, and the uniformity of the temperature distribution of the battery module is ensured. However, the battery heat exchange device system of the liquid cooling mode is too complex, and has high requirements on the tightness of the battery pack.
Heat pipes are widely used in electronic devices because of their rapid heat transfer properties, which utilize the evaporative heat exchange of an internal medium to transfer heat with extremely high heat exchange efficiency. At present, a heat pipe is commonly used for planar heat conduction, and when the heat pipe is used for heat exchange in the vertical direction, a gravity type heat pipe is used, the condensation end of the heat pipe in the form is arranged at the lower part of the upper evaporation end, and condensation reflux and thermodynamic cycle are realized by utilizing gravity, so that the heat pipe is only suitable for a heat exchange form of lower part cooling. When the condensing end is arranged at the lower part of the heat pipe, fluid in the capillary tube is diffused from the hot end to the cold end under the action of pressure difference, and the liquid at the cold end is restricted by gravity to rise to the hot end by overcoming gravity only by capillary force, so that the thermodynamic cycle in the heat pipe can not be realized, and the application range of the heat pipe under a plurality of efficient heat exchange conditions is greatly limited. Therefore, the invention provides a novel heat pipe array with bionic plant super-hydrophilic characteristic and prepares a composite battery heat management device aiming at the technical difficulties, so that the high-efficiency cooling of the battery pack in a high-temperature environment and under severe working conditions is realized, and the optimal working temperature, power output, cycle life and heat safety of the battery pack of the electric automobile are ensured.
Disclosure of Invention
The invention provides a composite battery thermal management device prepared by applying novel bionic plant super-hydrophilic characteristics and a bidirectional heat flow control method thereof. The bionic heat pipe heat collection is in solid-solid contact heat exchange with the battery, and the bionic heat pipe heat collection is in direct contact with the bottom-placed cold/hot plate at the bottom, so that heat transfer between the battery and the bottom-placed cold/hot plate is realized. Meanwhile, when the battery is changed from a cooling working condition to a preheating working condition, the cold and hot ends of the bionic heat pipe collector are adaptively converted along with the change of the state of the underlying cold/hot plate. The method overcomes the defect that the prior gravity type heat pipe cannot realize thermodynamic cycle and self-adaptive adjustment of the cold end and the hot end due to the fact that liquid at the cold end cannot rise to the hot end due to the influence of gravity, greatly improves the high-efficiency cooling capacity of the battery pack under the high-temperature environment and the severe working condition and the rapid preheating capacity of the battery pack under the cold low-temperature environment, and ensures the optimal working temperature, power output, cycle life and thermal safety of the battery pack of the electric automobile.
Drawings
Fig. 1 is a schematic diagram of a coupled heat pipe battery thermal management device.
Fig. 2 is a diagram showing a heat pipe collection form and arrangement of a single battery surface.
FIG. 3 is a schematic diagram of a bi-directional microchannel within an L-shaped bionic heat pipe.
FIG. 4 is a diagram of the internal hydrophilic microstructure of an L-shaped bionic heat pipe.
The numbers and corresponding designations of the various components in the figures are as follows:
In fig. 1-4: the solar cell comprises a 1-cell lower bracket, a 2-bottom cold/hot plate, a 3-cell upper bracket, a 4-bionic heat pipe collector, a 5-cell unit, a 6-bionic plant super-hydrophilic microstructure, a 7-heat conducting copper block, an 8-L-shaped heat pipe, a 9-I-shaped heat pipe, a 10-thin-wall copper plate, a 11-partition wall, a 12-wedge-shaped boss, a 13-wedge-shaped groove and a 14-heat flow sensor.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the battery thermal management device is composed of a battery lower bracket 1, a bottom cold/hot plate 2, a battery upper bracket 3, a bionic heat pipe collector 4, a battery monomer 5 and a heat flow sensor 14. Wherein the battery lower bracket 1, the bottom cold/hot plate 2 and the battery upper bracket 3 are connected by bolts. The battery lower bracket 1 is provided with a weight reduction groove, and the outer edge of the battery lower bracket is provided with a bolt opening for fixing the bottom-mounted cold/hot plate 2 and the battery upper bracket 3. The upper battery bracket 3 is provided with a heat pipe groove, and the bionic heat pipe collection 4 can be inserted into the upper battery bracket 3. The non-empty part of the upper battery bracket 3 is a discharge cell, and four corners are provided with bosses for being connected with the lower battery bracket 1. A bottom cooling/heating plate 2 is arranged between the battery lower bracket 1 and the battery upper bracket 3.
The reinforcing plate is welded below the bottom cold/hot plate 2, a heat pipe groove is processed on the upper surface of the bottom cold/hot plate 2, and the bionic heat pipe collector 4 can be inserted into the bottom cold/hot plate 2. Circular through holes are formed around the bottom cold/hot plate 2 and are used for fixing the bottom cold/hot plate 2 with the battery upper bracket 3 and the battery lower bracket 1. The cooling medium flows through the bottom cold/hot plate 2 to take away a great amount of heat transferred from the battery cells 5 to the bionic heat pipe collector 4.
The bionic heat pipe collector 4 is in direct contact with the battery monomer 5, and the lower part of the bionic heat pipe collector 4 is inserted into the battery upper bracket 3 and the bottom cold/hot plate 2. When the battery works normally, a large amount of heat is generated, the source of the heat mainly comprises ohmic heat and electrochemical reaction heat of the battery, and the heat generation at the tab of the battery is the most serious and the temperature is the highest. As shown in fig. 2, the bionic heat pipe set 4 is adopted to realize different cooling intensities for different areas of the battery, and meanwhile, the weight reduction of the battery thermal management device is perfected. The bionic heat pipe collector 4 consists of L-shaped heat pipes 8, I-shaped heat pipes 9 and two thin-wall copper plates 10 with different specifications. The dimensions of the L-shaped heat pipes 8 are gradually reduced from the upper left corner to the upper right corner on the thin-wall copper plate 10, and I-shaped heat pipes 9 are distributed in the center of the thin-wall copper plate 10. As shown in fig. 3 and 4, the inner surfaces of the L-shaped heat pipe 8 and the I-shaped heat pipe 9 are arrays of the bionic plant super-hydrophilic microstructures 6, and the opening directions of the bionic plant super-hydrophilic microstructures 6 of the adjacent two inner surfaces are opposite, and the inner surfaces of the L-shaped heat pipe 8 and the I-shaped heat pipe 9 in the thickness direction are called a liquid drop reflow wall. The bionic plant super-hydrophilic microstructure 6 is a wedge-shaped boss 12 with a sharp outer edge, and the microstructure can realize directional transportation of liquid in the heat pipe against gravity. Meanwhile, a heat conducting copper block 7 is arranged on the inner surface of the L-shaped heat pipe 8, heat at the heat conducting copper block 7 is transferred to the periphery of the bionic plant super-hydrophilic microstructure 6, and then the heat is transferred by the directional flow of the filling liquid acetone in the heat pipe. The specific processing mode of the bionic heat pipe collector 4 is as follows:
And selecting a low-resistance silicon wafer, and polishing the surface of the low-resistance silicon wafer. Then gluing the surface of the mask to manufacture a layer of mask. And deep etching is carried out on the surface of the silicon wafer. A piece of heat-resistant glass is selected, a metal layer is sputtered on the heat-resistant glass, and leads and lead holes are formed by photoetching. The bonding process is utilized to bond the silicon wafer and the heat-resistant glass, and electroplating can be used for completing the copper metallization process of the surface of the silicon wafer. Finally, removing the silicon wafer on the surface by utilizing an etching technology to obtain the copper metal sheet with the bionic plant super-hydrophilic microstructure 6 on the surface. The copper sheet is rolled up and welded into a tube shell, one end of the tube shell is welded with the end cover into a whole, working medium is filled in the tube shell, and the heat pipe is baked to achieve the aim of exhausting air. And welding the end socket at the other end of the tube shell to prepare the I-shaped heat tube 9. An L-shaped heat pipe 8 with a special shape is manufactured at a proper position by utilizing a pipe bending machine, and meanwhile, a plurality of L-shaped heat pipes 8 and I-shaped heat pipes 9 with different sizes are welded on two thin-wall copper plates 10 to manufacture the bionic heat pipe collector 4.
As shown in fig. 2, four heat flow sensors 14 are arranged on the thin-walled copper plate 10 of the bionic heat pipe collector 4, and four heat monitoring areas are selected in the areas of the battery cells 5 close to the lugs and the central heat concentration of the battery. The average value of the heat quantity measured by the four heat flow sensors 14 and the heat flow of the area close to the tab are respectively compared with standard set values, so that the flow of the bottom cold/hot plate 2 is controlled together, and the temperature of the battery is maintained within an ideal working temperature range.
When the external environment is a low-temperature environment and the automobile is in a long-time parking state, the upper part of the bionic heat pipe collector 4 is changed from the evaporation end to the condensation end, and the bionic heat pipe collector 4 transfers the heat of the bottom cold/hot plate 2 to the battery cell 5 for preheating. At this time, the acetone at the upper parts of the L-shaped heat pipe 8 and the I-shaped heat pipe 9 is changed from a gas state to a liquid state, and returns to the lower parts of the L-shaped heat pipe 8 and the I-shaped heat pipe 9 along the liquid drop return wall, i.e., the evaporation end. The underlying cold/hot plate 2 is now changed from a cooling plate when the battery is operating normally to a heating plate. The evaporating end and the condensing end of the whole refrigeration system are also interchanged, and become a heat pump system.
When the external environment is a high-temperature environment and the automobile is in high-load working conditions such as acceleration, climbing and the like, the heat generation of the battery is greatly increased. The original bionic heat pipe collector 4 and the bottom cold/hot plate 2 have insufficient cooling capacity, so that the heat management system is not matched with the current working condition. Thus, the refrigerant flow is adjusted to the maximum flow of the refrigeration system. Thereby increasing the heat transfer flow of the bionic heat pipe collector 4 and ensuring the optimal working temperature and performance of the battery under the high-load running working condition.
When the external environment is a high-temperature environment and the automobile is in a low-load working condition, the heat generated by the battery is greatly reduced. The capability of the original bionic heat pipe heat collection 4 and the bottom cold/hot plate 2 is excessive and is not matched with the current working condition. Thus regulating the flow of refrigerant to a smaller flow rate to the refrigeration system. Therefore, the heat radiation capacity of the condensation end at the lower part of the bionic heat pipe collection 4 and the cooling capacity of the evaporation end at the upper part are reduced, and the optimal working temperature and performance of the battery under the low-load running working condition are ensured.
When the external environment is a low-temperature environment and the automobile is in high-load working conditions such as acceleration, climbing and the like, the heat generation of the battery is increased sharply. The original bionic heat pipe collector 4 and the bottom cold/hot plate 2 are not matched with the current working condition due to insufficient cooling capacity. The refrigerant flow should be adjusted to a larger flow to this refrigeration system. Thereby increasing the heat radiation capacity of the condensing end and the cooling capacity of the evaporating end of the heat pipe, and ensuring the optimal working temperature and performance of the battery under the high-load running working condition.
When the external environment is a low-temperature environment and the automobile is in a low-load working condition, the heat generated by the battery is greatly reduced. The capability of the original bionic heat pipe heat collection 4 and the bottom cold/hot plate 2 is excessive and is not matched with the current working condition. The refrigerant flow should be adjusted to the minimum flow to this refrigeration system. Therefore, the heat radiation capacity of the condensation end at the lower part of the heat pipe and the cooling capacity of the evaporation end at the upper part of the heat pipe are reduced, and the optimal working temperature and performance of the battery under the low-load running working condition are ensured.
Claims (9)
1. The utility model provides a battery thermal management device of novel bionic heat pipe of utilization coupling, its characterized in that mainly includes battery lower carriage (1), end cold/hot plate (2), battery upper bracket (3), bionical heat pipe collection (4), battery monomer (5), heat flow sensor (14), bionical heat pipe collection (4) are given in bionical heat pipe collection (5) heat transfer that produces in normal course of working, bionical heat pipe collection (4) and end cold/hot plate (2) direct contact simultaneously, finally realize cooling and preheating to whole battery package, bionical heat pipe collection (4) are by L type heat pipe (8), I type heat pipe (9) and two thin wall copper (10) of different specifications, and the size of L type heat pipe (8) is progressively decreased in proper order from upper left corner, upper right corner on thin wall copper (10), distributes I type heat pipe (9) at the middle part of thin wall copper (10), and the interior surface of L type heat pipe (8) and I type heat pipe (9) is bionical plant super-hydrophilic microstructure (6) array, and the opposite of two adjacent interior surface microstructures, plant super-hydrophilic microstructure (6) and wedge boss (13) are constituteed by bionical wall (13).
2. The battery thermal management device utilizing the novel coupling bionic heat pipe according to claim 1 is characterized in that the bottom cooling/heating plate (2) and the battery upper bracket (3) are fixed on the battery lower bracket (1), through holes are formed in the positions, which are the same as the positions of the battery lower bracket (1), of the outer edges of the bottom cooling/heating plate (2), the bottom cooling/heating plate (2) is fixed on the battery lower bracket (1) through bolts, meanwhile, the bottom cooling/heating plate (2) is provided with grooves, the bionic heat pipe collector (4) is inserted into the grooves, and the through holes are formed in the battery upper bracket (3) so that the bionic heat pipe collector (4) penetrates through.
3. The battery thermal management device utilizing the novel coupling bionic heat pipe according to claim 1, wherein two thin-wall copper plates (10) of the bionic heat pipe collection (4) are in direct contact with a battery monomer (5), an L-shaped heat pipe (8) and an I-shaped heat pipe (9) are welded between the two thin-wall copper plates (10), the height and the width of the L-shaped heat pipe (8) are gradually decreased from outside to inside on the thin-wall copper plates (10) layer by layer, the depth direction is not changed, and the I-shaped heat pipes (9) which are symmetrically distributed are arranged in the middle of the thin-wall copper plates (10).
4. The battery thermal management device utilizing the novel coupling bionic heat pipe according to claim 1, wherein the liquid filled in the L-shaped heat pipe (8) and the I-shaped heat pipe (9) is acetone.
5. The battery thermal management device using the novel coupling bionic heat pipe according to claim 1, wherein the specific processing mode of the bionic plant super-hydrophilic microstructure (6) is as follows: selecting a piece of low-resistance silicon wafer, polishing the surface of the silicon wafer, then gluing a layer of mask on the surface of the silicon wafer, deep etching the surface of the silicon wafer, simultaneously selecting a piece of heat-resistant glass, sputtering a metal layer on the heat-resistant glass, photoetching to form a lead wire and a lead wire hole, adhering the silicon wafer and the heat-resistant glass by using an adhesion process, completing a copper metallization process of the surface of the silicon wafer by electroplating, finally removing the silicon wafer on the surface by using an etching technology to obtain a thin-wall copper plate (10) with a bionic plant super-hydrophilic microstructure (6) on the surface, rolling the copper plate and welding the copper plate into a tube shell, welding one end of the tube shell and an end cover into a whole, filling working medium into the tube shell, baking the tube to achieve the aim of exhausting air, welding the end cover of the tube shell to form an I-shaped heat tube (9), bending the tube (8) at a proper position to form an L-shaped heat tube, and welding a plurality of L-shaped heat tubes (8) and the I-shaped heat tubes (9) with different sizes onto the two thin-wall copper plates (10) to form the bionic collector (4).
6. The battery thermal management device utilizing the novel coupling bionic heat pipe according to claim 1 is characterized in that 4 heat flow sensors (14) are arranged on a thin-wall copper plate (10) of the bionic heat pipe collector (4), four heat monitoring areas are selected in areas, close to the lugs, of the battery unit (5) and the middle part of the battery, heat flow of the areas, close to the lugs, of the battery unit is selected, the average value of heat measured by the four heat flow sensors (14) and the heat flow of the areas, close to the lugs, are compared with a standard set value, the flow of a bottom-mounted cold/hot plate (2) is controlled jointly, and the temperature of the battery is maintained in an ideal working temperature range.
7. The battery thermal management device using the novel coupling bionic heat pipe according to claim 4, wherein when the external environment is a low-temperature environment and the automobile is in a long-time parking state, the upper part of the bionic heat pipe collection (4) is changed from an evaporation end to a condensation end, heat is transferred to preheat the battery unit (5), at the moment, acetone at the upper parts of the L-shaped heat pipe (8) and the I-shaped heat pipe (9) is changed from a gas state to a liquid state, and returns to the lower parts of the L-shaped heat pipe (8) and the I-shaped heat pipe (9) along a liquid drop backflow wall, namely, the evaporation end, at the moment, the bottom-placed cold/hot plate (2) is changed into a heating plate from a cooling plate when the battery is in normal operation, and the evaporation end and the condensation end of the whole refrigeration system are also exchanged, so that the battery thermal management device is changed into a heat pump system.
8. The battery thermal management device utilizing the novel coupling bionic heat pipe according to claim 1, wherein when the external environment is a high-temperature environment and the automobile is in a high-load working condition, the flow of the refrigerant is regulated to the maximum flow of the refrigerating system, so that the heat transfer capacity of the bionic heat pipe collector (4) is increased, and the optimal working temperature and performance of the battery under the high-load running working condition are ensured.
9. The battery thermal management device utilizing the novel coupling bionic heat pipe according to claim 1, wherein when the external environment is a low-temperature environment and the automobile is in a low-load working condition, the flow of the refrigerant is regulated to the minimum flow of the refrigerating system, so that the heat dissipation capacity of the lower condensation end and the cooling capacity of the upper evaporation end of the bionic heat pipe collector (4) are reduced, and the optimal working temperature and performance of the battery under the low-load running working condition are ensured.
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| CN111641005B (en) * | 2020-07-21 | 2021-06-15 | 苏州臻迪智能科技有限公司 | Battery pack module |
| CN115911676A (en) * | 2022-11-29 | 2023-04-04 | 广东畅能达科技发展有限公司 | Soft package stacked large single battery and heat dissipation method |
| CN117255545B (en) * | 2023-11-20 | 2024-04-02 | 浙江银轮机械股份有限公司 | Bionic thermal management method |
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