CN117039254A - Liquid cooling heat dissipation device and method for battery module - Google Patents
Liquid cooling heat dissipation device and method for battery module Download PDFInfo
- Publication number
- CN117039254A CN117039254A CN202311097999.1A CN202311097999A CN117039254A CN 117039254 A CN117039254 A CN 117039254A CN 202311097999 A CN202311097999 A CN 202311097999A CN 117039254 A CN117039254 A CN 117039254A
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- Prior art keywords
- liquid cooling
- battery module
- cooling heat
- water
- heat dissipation
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- 239000007788 liquid Substances 0.000 title claims abstract description 77
- 238000001816 cooling Methods 0.000 title claims abstract description 72
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000110 cooling liquid Substances 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims 1
- 238000004080 punching Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 238000013461 design Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 239000000178 monomer Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
-
- 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
- H01M10/6567—Liquids
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a liquid cooling heat dissipation device and a liquid cooling heat dissipation method for a battery module, wherein the liquid cooling heat dissipation device is attached to the bottom of the battery module through a heat conduction pad, and an internal structure with larger water channel diameter at the contact part of the liquid cooling heat dissipation device and the edge of the battery module, namely the outlet position, and smaller water channel diameter at the contact part of the liquid cooling heat dissipation device and the central area of a battery pack, namely the inlet position, is designed, so that the flow speed of cooling liquid and the battery module at the contact position of a thermoelectric core is increased, and the central area of the battery module is effectively dissipated; and the water inlet is arranged in the middle area, so that the heat dissipation of the battery core in the central area is further improved, and the purposes of comprehensively improving the temperature uniformity of the battery module, and improving the reliability and the service life of the battery module are achieved.
Description
Technical Field
The application belongs to the technical field of battery heat dissipation, and particularly relates to a liquid cooling heat dissipation device and method for a battery module.
Background
The research shows that the battery is extremely sensitive to temperature, and in general, the optimal working temperature interval of the lithium ion battery in the actual working condition is 15-45 ℃, and all performances of the battery in the interval can be excellent, and certain heat accumulation can be formed in the battery charging and discharging process, so that the battery charging and discharging and the service life are influenced; and because of the dense arrangement of the battery bodies in the battery pack, the heat is necessarily accumulated in the middle area, and the quantity of heat is relatively small in the edge area, so that the temperature imbalance among all the monomers in the battery pack is increased, and the consistency of the battery performance and the SOC estimation accuracy are finally affected. Therefore, the further improvement of the heat dissipation and the temperature uniformity of the battery pack is of great significance for prolonging the service life of the battery pack.
In the prior art, the most applied liquid cooling plate heat dissipation structure in the battery system is a harmonica tube design and a stamping flow passage cold plate. The harmonica pipe is designed with a liquid cooling plate structure, so that the defect of relatively poor cooling effect caused by small contact area between the cooling plate and the battery cell is overcome; the stamping runner type cold plate is designed relative to the harmonica pipe, increases the contact area of the cold plate and the battery cell, can provide better cooling effect, has the advantages of being capable of designing runners at will, large in contact area, good in heat exchange effect, high in production efficiency, good in pressure resistance and strength and the like, and becomes a research hot spot of the development trend of the battery pack liquid cooling plate.
The prior art 1 discloses a battery module double-in double-out three-side liquid cooling liquid heating structure and a liquid cooling liquid heating method thereof (CN 115692928A), the whole structure is a waterway system, a first module side liquid cooling plate, a second module side liquid cooling plate, a third module side liquid cooling plate, a fourth module side liquid cooling plate and a bottom liquid cooling plate form a whole parallel connection, three-side liquid cooling liquid heating of the whole battery module is completed, and the battery pack is rapidly cooled in a quick charging process, but the defects in the prior art 1 are that the liquid cooling liquid heating liquid flow rates of a higher temperature part and a lower temperature part in the battery module are the same, so that the temperature of each monomer in the battery module is unbalanced, and the service life of the battery module is influenced.
The prior art 2 discloses a battery pack heat dissipation structure (CN 206471459U), which comprises a plurality of heat dissipation plates, a refrigeration module, two first reducing pipelines and two second reducing pipelines, wherein the reducing pipelines are used for uniformly distributing cooling liquid, and the design of double pipelines is combined, so that the battery pack heat dissipation structure has the characteristics of good heat dissipation effect and good temperature uniformity, but the defects in the prior art 2 are that the pipelines are complex, a plurality of main pipelines and branch pipelines are involved, so that the flow resistance of a liquid cooling system is larger, and the cost of a water pump is increased; the design pipeline diameter can only be changed uniformly, and the application scene is limited.
The prior art 3 discloses a method for establishing a liquid cooling heat dissipation structure of a battery box and a corresponding structure (CN 108390128), and the heat dissipation effect is improved by 2.7-8.6% by adding a heat conduction cold plate scheme of a battery gap; changing the pipe diameter scheme of the cooling liquid pipeline in the cold plate, the heat dissipation effect of the battery is obviously improved along with the increase of the pipe diameter, but the defect in the prior art 3 is that the structure is complicated and the processing difficulty is high; the liquid cooling system has larger flow resistance and increases the cost of the water pump due to the fact that the liquid cooling system relates to a plurality of main pipelines, internal branches and heat conduction cold plates; and the current direction of the water inlet and outlet is changed in real time, so that local hot spots of a certain cell in the current conversion process are easily caused, and the heat dissipation risk and the operation cost are increased.
At present, research and improvement of a stamping runner type cold plate are mainly focused on controlling the overall temperature rise of a battery pack by changing the shape of an internal runner, and the research on controlling the temperature difference between each electric core in the battery pack is still not deep enough. The large temperature difference in the battery pack is not beneficial to the coordination among the monomers and the full play of the performance of the battery module, so that the service life and the safety of the battery pack are influenced. Therefore, on the premise of controlling the overall temperature rise of the battery pack, the method has important significance in further reducing the temperature difference between the battery cells of the battery pack, so that the design direction of the liquid cooling heat dissipation plate of the battery pack should be more compatible with the design concept of reducing the temperature difference between the battery cells.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a liquid cooling heat dissipation device and a liquid cooling heat dissipation method for a battery module.
The application is realized by the following technical scheme: the utility model provides a battery module liquid cooling heat abstractor, includes water course, water inlet, delivery port, coolant liquid and outer packaging layer, and the water inlet sets up in the middle of the liquid cooling heat abstractor, and the delivery port sets up in liquid cooling heat abstractor edge, and the water course is reducing structure, connects water inlet and delivery port, and delivery port position department water course pipe diameter is greater than water course pipe diameter of water inlet position department, and the coolant liquid is annotated the water course from the water inlet to discharge from the delivery port.
The preferred technical scheme of the application is as follows.
In one possible implementation manner, the number of water inlets is 2, the number of water outlets is 2, and the water channel of the liquid cooling heat dissipation device is of a double-inlet double-outlet structure.
In one possible implementation, the number of water inlets exceeds 2, the number of water outlets exceeds 2, and the water channel of the liquid cooling heat dissipation device is of a multi-inlet multi-outlet structure.
In one possible implementation, the waterway is an S-shaped reducing structure.
In one possible implementation, the reducing manner of the water channel is as follows: one or more of gradual change, step change and monotonous change.
In one possible implementation, the pipe diameter of the water channel meets the following requirements:
r i ＝r n -i×a/N
where a is the gradient of variation, r n Is the diameter of the water channel at the most edge, N is a constant, r i For the water channel diameter of the ith row of cells counted from the edge to the middle, delta T 1 The average temperature of the middle-row battery cells rises, delta T when the constant diameter scheme is adopted i The average temperature rise of the ith row of cells counted from the middle to the edge direction.
In one possible implementation, the waterway spacing is: the lower part of each row of electric cores of the battery module spans at least two water channels with opposite directions.
In one possible implementation, the outer encapsulation layer is an aluminum substrate and the waterways are curved copper tubes.
In one possible implementation, the bent copper tube is stamped on the digitally controlled grooved aluminum substrate and soldered.
A liquid cooling heat dissipation method of a battery module liquid cooling heat dissipation device comprises the following steps:
step 1, a battery module, a heat conduction device and a liquid cooling heat dissipation device are connected, wherein the heat conduction device is positioned in the middle and is fixedly connected with the battery module and the liquid cooling heat dissipation device respectively;
and 2, injecting cooling liquid into the water inlet of the liquid cooling heat radiating device, enabling the cooling liquid to flow out along the S-shaped non-constant diameter water channel through the water outlet, and enabling the cooling liquid to be driven by a water pump to circularly flow so as to take away heat.
Compared with the prior art, the beneficial effect of this scheme is: the non-constant diameter water channel design can enable the flow speed of the cooling liquid to be faster than that of the contact position of the thermoelectric core, the water inlet is arranged in the middle area, the water outlet is arranged in the edge area, the central area of the battery module is effectively cooled, the purpose of improving the temperature uniformity of the battery pack is achieved, the coordination of each monomer is improved, the full play of the performance of the battery module is ensured, and the service life and the safety of the battery module are improved.
Drawings
FIG. 1 is a schematic diagram of a water channel structure of a liquid-cooled heat sink according to the present application;
FIG. 2 is a schematic diagram of the result of temperature rise simulation of a battery module of the medium-diameter liquid cooling heat sink of the present application;
FIG. 3 is a schematic diagram of the temperature rise simulation result of a battery module of a non-constant diameter liquid cooling heat sink according to the present application;
fig. 4 is a schematic view of the battery module according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments of the application are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are within the scope of the present application.
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
As shown in fig. 1, the present embodiment provides a liquid cooling heat dissipation device and a method for a battery module, where the liquid cooling heat dissipation device is attached to the bottom of the battery module through a heat conducting pad, the pipe diameter of a water channel inside the liquid cooling heat dissipation device changes with position, and the liquid cooling heat dissipation device has a dual-inlet dual-outlet or multiple-inlet multiple-outlet structure, where a water inlet is disposed at a middle position where the battery core generates heat seriously, and a water outlet is disposed at an edge position where the battery core generates heat relatively not seriously.
The liquid cooling heat abstractor and battery module edge contact part, namely delivery port position, the water channel pipe diameter is great, and liquid cooling heat abstractor and battery module central zone contact part, namely water inlet position, the less inner structure of water channel pipe diameter for the velocity of flow of coolant liquid and battery module comparison thermoelectric core contact position is accelerated, thereby dispels the heat to battery module central zone more effectively.
The water channel diameter change mode can be flexibly designed according to the cell spacing and heat distribution conditions in the battery module, such as gradual change, step change, monotonous change and the like. The heat dissipation simulation can be firstly carried out according to the equal-diameter scheme with the same water channel quantity and water flow, the specific scheme design of reducing is carried out after the average temperature rise of the electric cores and the temperature difference between the electric cores are obtained, if the temperature rise from the middle electric core to the edge electric core is in linear change during the equal-diameter scheme, the water channel pipe diameter can be designed into a linear monotone change scheme, and the like.
The calculation formula of the diameter of the reducing water channel of the liquid cooling heat dissipation device is as follows:
r i ＝r n -i×a/N
where a is the gradient of variation, r n Is the diameter of the water channel at the most edge, N is a constant, r i For the water channel diameter of the ith row of cells counted from the edge to the middle, delta T 1 The average temperature of the middle-row battery cells rises, delta T when the constant diameter scheme is adopted i The average temperature rise of the ith row of cells counted from the middle to the edge direction.
When the temperature rise shows linear change, a is a linear slope, and when the curve changes, a is a curve slope.
In this embodiment r is taken n And the constant N is equal to the radius of the battery cell, the value of the constant N is 2, and the constant N can be adjusted in proportion according to the number of the battery cell columns.
The water channel distance is reduced as much as possible on the basis of meeting the processing strength of the liquid cooling heat dissipation device, so that a larger contact area exists between the cooling liquid and the liquid cooling heat dissipation device, and the cooling liquid can fully dissipate heat of the battery cell. If the arrangement of the electric cores is changed, at least two S-shaped water channels with opposite directions are arranged below each row of electric cores in a crossing manner, so that the temperature difference between the electric cores is further reduced.
The water channel of the liquid cooling heat dissipation device is of a double-inlet double-outlet structure or a multiple-inlet multiple-outlet structure, the cooling liquid water inlet is positioned in the middle of the liquid cooling heat dissipation device, and the cooling liquid water outlet is positioned at the edge of the liquid cooling heat dissipation device, so that the purpose that the heat dissipation of the battery core in the middle area of the battery pack is better, the temperature uniformity is improved, and the service life of the battery pack is prolonged.
As shown in fig. 2 and 3, the cooling finite element simulation software is used for simulating the temperature rise of the battery module under the same discharge multiplying power by using the equal-diameter and non-equal-diameter liquid cooling heat dissipation devices with equal external dimensions and the same water flow, so that the overall temperature rise and the temperature difference of the battery module using the non-equal-diameter liquid cooling heat dissipation device can be obviously reduced.
As shown in fig. 4, the method of use of the present application is as follows: the battery module is connected with the liquid cooling heat dissipation device through the heat conduction pad, the heat of the battery core is transferred to the liquid cooling heat dissipation device through the heat conduction pad, and the heat is taken away by the free circulation flow of the heat expansion and cold contraction of the cooling liquid, so that the temperature of the whole battery module is controlled within a safe range.
The beneficial technical effects of this scheme are: the heat dissipation of the battery core in the middle area of the battery module is effectively improved, the overall temperature uniformity of the battery module is improved, the coordination of each monomer is improved, the full play of the performance of the battery module is ensured, and the service life and the safety of the battery module are improved.
While the applicant has described and illustrated the embodiments of the present application in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present application, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present application, and not to limit the scope of the present application, but any improvements or modifications based on the spirit of the present application should fall within the scope of the present application.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. The utility model provides a battery module liquid cooling heat abstractor, includes water course, water inlet, delivery port, coolant liquid and outer packaging layer, its characterized in that:
the water inlet is arranged in the middle of the liquid cooling heat dissipation device, the water outlet is arranged at the edge of the liquid cooling heat dissipation device, the water channel is of a variable diameter structure and is connected with the water inlet and the water outlet, the water channel pipe diameter at the position of the water outlet is larger than that at the position of the water inlet, and cooling liquid is injected into the water channel from the water inlet and is discharged from the water outlet.
2. The battery module liquid cooling heat sink according to claim 1, wherein:
the number of water inlets is 2, the number of water outlets is 2, and the water channel of the liquid cooling heat radiator is of a double-inlet double-outlet structure.
3. The battery module liquid cooling heat sink according to claim 1, wherein:
the number of water inlets exceeds 2, the number of water outlets exceeds 2, and the water channel of the liquid cooling heat radiator is of a multi-inlet multi-outlet structure.
4. The battery module liquid cooling heat sink according to claim 1, wherein:
the water channel is of an S-shaped reducing structure.
5. The battery module liquid cooling heat sink according to claim 1, wherein:
the reducing mode of the water channel is as follows: one or more of gradual change, step change and monotonous change.
6. The battery module liquid cooling heat sink according to claim 1, wherein:
the pipe diameter of the water channel meets the following requirements:
r i ＝r n -i×a/N
where a is the gradient of variation, r n Is the diameter of the water channel at the most edge, N is a constant, r i Counting from edge to middlei row of electric core water channel pipe diameter, delta T 1 The average temperature of the middle-row battery cells rises, delta T when the constant diameter scheme is adopted i The average temperature rise of the ith row of cells counted from the middle to the edge direction.
7. The battery module liquid cooling heat sink according to claim 1, wherein:
the water channel spacing is as follows: the lower part of each row of electric cores of the battery module spans at least two water channels with opposite directions.
8. The battery module liquid cooling heat sink according to claim 1, wherein:
the outer packaging layer is an aluminum substrate, and the water channel is a bent copper pipe.
9. The battery module liquid-cooled heat sink of claim 8, wherein:
and punching the bent copper pipe on the aluminum substrate after numerical control milling grooves, and performing braze welding.
10. A liquid cooling heat dissipation method using the liquid cooling heat dissipation device for a battery module according to any one of claims 1 to 8, comprising:
step 1, a battery module, a heat conduction device and a liquid cooling heat dissipation device are connected, wherein the heat conduction device is positioned in the middle and is fixedly connected with the battery module and the liquid cooling heat dissipation device respectively;
and 2, injecting cooling liquid into the water inlet of the liquid cooling heat radiating device, enabling the cooling liquid to flow out along the S-shaped non-constant diameter water channel through the water outlet, and enabling the cooling liquid to be driven by a water pump to circularly flow so as to take away heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311097999.1A CN117039254A (en) | 2023-08-29 | 2023-08-29 | Liquid cooling heat dissipation device and method for battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311097999.1A CN117039254A (en) | 2023-08-29 | 2023-08-29 | Liquid cooling heat dissipation device and method for battery module |
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| Publication Number | Publication Date |
|---|---|
| CN117039254A true CN117039254A (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311097999.1A Pending CN117039254A (en) | 2023-08-29 | 2023-08-29 | Liquid cooling heat dissipation device and method for battery module |
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| CN (1) | CN117039254A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119340544A (en) * | 2024-09-06 | 2025-01-21 | 通号（长沙）轨道交通控制技术有限公司 | Liquid-cooled battery pack and its design method, equipment, storage medium and product |
| CN119581991A (en) * | 2025-02-07 | 2025-03-07 | 中国科学院长春光学精密机械与物理研究所 | A semiconductor laser packaging structure |
-
2023
- 2023-08-29 CN CN202311097999.1A patent/CN117039254A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119340544A (en) * | 2024-09-06 | 2025-01-21 | 通号（长沙）轨道交通控制技术有限公司 | Liquid-cooled battery pack and its design method, equipment, storage medium and product |
| CN119340544B (en) * | 2024-09-06 | 2025-09-23 | 通号（长沙）轨道交通控制技术有限公司 | Liquid-cooled battery pack and its design method, equipment, storage medium and product |
| CN119581991A (en) * | 2025-02-07 | 2025-03-07 | 中国科学院长春光学精密机械与物理研究所 | A semiconductor laser packaging structure |
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