CN111403853B - Power battery thermal management system based on joint liquid cooling heat dissipation of utmost point ear and module bottom - Google Patents
Power battery thermal management system based on joint liquid cooling heat dissipation of utmost point ear and module bottom Download PDFInfo
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- CN111403853B CN111403853B CN202010232874.5A CN202010232874A CN111403853B CN 111403853 B CN111403853 B CN 111403853B CN 202010232874 A CN202010232874 A CN 202010232874A CN 111403853 B CN111403853 B CN 111403853B
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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
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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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
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/6567—Liquids
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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 invention aims to provide a power battery thermal management system based on joint liquid cooling heat dissipation of a lug and the bottom of a module, which comprises a battery core, a positive lug, a negative lug, a connecting bar, a lug liquid cooling plate, an isolation frame, a heat equalizing film, a bottom liquid cooling plate and a bottom heat insulation pad. The positive pole and the negative pole of the battery cell are connected through a connecting bar and then fixed into a group by a left end plate, a right end plate and a peripheral fastening bandage; the upper part of the system is provided with an isolation frame which is adhered to the top surface of the battery cell through a structural adhesive, the isolation frame is provided with a front channel and a rear channel which are filled with heat-conducting adhesive and then paved with a soaking film, and an ear liquid cooling plate is arranged above the soaking film; the bottom of the battery cell is sequentially provided with a lower liquid cooling plate, a bottom uniform heating film and a bottom heat insulation pad from top to bottom. The battery cell cooling system is based on the combined liquid cooling heat dissipation of the battery cell lug and the bottom, and has the advantages of compact system structure, high temperature uniformity and good heat dissipation effect; the upper and lower liquid cold plate clamping modules can further enhance the system reliability.
Description
Technical Field
The invention relates to a power battery thermal management system.
Background
In recent years, accidents such as smoking, spontaneous combustion, and ignition of electric vehicles have been frequent. The power battery as its core component is developing towards high energy density, long endurance mileage, short charging time, high safety, high space utilization, light weight, and long cycle life.
The air-cooled heat management mode has the advantages of low air heat conduction coefficient, small convection heat transfer coefficient, long time required for heat dissipation, large inlet-outlet pressure difference, uneven flow field, poor temperature uniformity and poor cooling effect with high discharge rate; the phase-change material has low thermal conductivity, small phase-change latent heat, limited heat exchange amount, additional volume increase, heavier mass and more difficult solution of the preheating problem of the phase-change material heat management mode; the heat pipe and the battery have high shape adaptability requirement, complex structure, poor heat exchange performance of the structure in the pipe, high insulativity requirement, high processing technology requirement and relatively high cost. The refrigerant adopted by the liquid cooling heat management mode has large specific heat capacity, high heat conductivity, large heat transfer coefficient, thin boundary layer, strong heat exchange capability, integration of heat dissipation and preheating and good temperature uniformity. In recent years, with the development of quick charging technology and the demand of high charging and discharging rates for heat dissipation, a liquid cooling heat management mode has become a mainstream development trend at present.
At present, most of power batteries are internally composed of a positive electrode, a diaphragm, a negative electrode and a battery shell, the diaphragm material is low in heat conductivity coefficient, the heat resistance from the inside of a battery core to the direction vertical to the surface is large, the heat conductivity is poor, and the heat transfer effect is poor. The connecting posts of the positive electrode and the negative electrode of the battery are directly connected with the current collecting plates of the positive electrode and the negative electrode of the battery, the positive electrode of the battery is made of aluminum materials, the negative electrode of the battery is made of nickel, copper or copper-plated nickel materials, and the aluminum and the copper have high heat conductivity, small heat resistance and good heat transfer performance.
In summary, in the technical field of power battery thermal management, a power battery thermal management system capable of integrating battery core tabs and bottoms and performing integrated liquid cooling heat dissipation is urgently needed.
Disclosure of Invention
The invention aims to provide a power battery heat management system based on combined liquid cooling heat dissipation of a lug and the bottom of a module, which has the advantages of compact structure, high temperature uniformity among batteries and good heat dissipation effect.
The purpose of the invention is realized as follows:
the invention relates to a power battery thermal management system based on joint liquid cooling heat dissipation of a lug and the bottom of a module, which is characterized in that: the battery module comprises battery cells, a left end plate, a right end plate, a polar ear liquid cooling plate and a liquid cooling plate, wherein positive and negative polar ears between the battery cells are connected through a connecting bar, all the battery cells are clamped between the left end plate and the right end plate to form a battery module, a left heat insulation pad is arranged between the left end plate and the adjacent battery cell, a right heat insulation pad is arranged between the right end plate and the adjacent battery cell, an isolation frame is arranged above the battery module and comprises a front channel, a middle channel and a rear channel, heat conduction filling glue is filled in the front channel and the rear channel so as to fill the polar ears connected with the battery cells by the connecting bar to form an irregular module left after the battery module, and a graphene heat equalizing film is laid on a plane formed by filling the heat conduction filling glue, utmost point ear liquid cooling board sets up in graphite alkene soaking membrane top, lower liquid cooling board sets up in battery module below, utmost point ear liquid cooling board includes utmost point ear liquid cooling board inlet one, utmost point ear liquid cooling board inlet two, utmost point ear liquid cooling board liquid outlet one, utmost point ear liquid cooling board liquid outlet two, lower liquid cooling board includes down liquid cooling board inlet, lower liquid cooling board liquid outlet, utmost point ear liquid cooling board inlet one, utmost point ear liquid cooling board inlet two, lower liquid cooling board inlet is connected through first tee bend quick connector, utmost point ear liquid cooling board liquid outlet one, utmost point ear liquid cooling board liquid outlet two, lower liquid cooling board liquid outlet is connected through second tee bend quick connector, lower liquid cooling board inlet links to the liquid outlet of liquid cooling machine, lower liquid cooling board liquid outlet links to the liquid return mouth of liquid cooling machine.
The present invention may further comprise:
1. the whole height of isolation frame is greater than the height that battery tab and run-on were connected the back and are protruded battery module, and isolation frame is hollow structure, and hollow portion's space setting is greater than the irregular space that remains after battery module upper portion utmost point ear run-on is connected.
The invention has the advantages that:
1. the invention provides a power battery heat management system based on battery core lug and bottom combined liquid cooling heat dissipation, wherein an isolation frame is arranged to separate a battery core lug connecting bar from a lug liquid cooling plate above the battery core lug connecting bar, so that the occurrence of an external short circuit phenomenon can be effectively prevented, and the safety and reliability of the heat management system are improved.
2. The invention provides a power battery thermal management system based on combined liquid cooling heat dissipation of a battery core lug and the bottom, wherein high-temperature insulating heat-conducting glue is filled in front and rear filling grooves of an isolation frame, so that the heat exchange contact area of the lug and a liquid cooling plate can be greatly increased, and the heat exchange effect is enhanced; the electric core is clamped between the polar lug liquid cooling plate and the lower liquid cooling plate, so that the integration level and the space utilization rate of the whole system can be improved.
3. The invention provides a power battery thermal management system based on combined liquid cooling heat dissipation of a battery cell lug and the bottom, wherein a graphene film is clamped between a lug liquid cooling plate and a high-temperature heat-conducting insulating silica gel filling plane; between module bottom and lower liquid cold drawing, change traditional heat conduction silica gel pad and be the homothermal membrane of graphite alkene, can strengthen whole thermal management system along the heat transfer rate of horizontal direction, play the soaking effect, compensate the dimensional tolerance between electric core simultaneously. The temperature uniformity among the battery cores at different positions of the whole thermal management system is high, and the heat dissipation effect is good.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1, the invention provides a power battery thermal management system based on combined liquid cooling heat dissipation of a battery cell tab and the bottom, wherein a battery pack is clamped by liquid cooling plates arranged at the top and the bottom of the system, and high-efficiency liquid cooling heat dissipation is performed by combination of multiple spatial dimensions; the heat-conducting filling glue arranged in the isolation frame increases the heat exchange contact area between the lug and the top liquid cooling plate. The invention couples a heat management mode of tab heat dissipation, can greatly reduce heat transfer resistance of the system, efficiently dissipate heat of the battery module, ensure that the power battery is in a proper temperature range, and further improve the temperature uniformity of the system. The invention can better avoid the problem of frequent battery thermal runaway at present and promote the development of new energy hybrid power and pure electric vehicles.
In fig. 1, the power battery thermal management system based on battery core tab and bottom combined liquid cooling heat dissipation of the present invention includes a right end plate 1, a right heat insulation plate 2, a positive electrode tab 3, a connection row 4, a negative electrode tab 5, a first liquid inlet 6 of a tab liquid cooling plate, a second liquid inlet 7 of the tab liquid cooling plate, a tab liquid cooling plate 8, a second liquid outlet 9 of the tab liquid cooling plate, a heat conducting filling glue 10, a first liquid outlet 11 of the tab liquid cooling plate, an isolation frame 12, a heat conducting filling tank 13, a fastening binding tape 14, a safety valve 15, a left heat insulation plate 16, a left end plate 17, a lower liquid cooling plate liquid inlet 18, a bottom heat insulation pad 19, a lower liquid cooling plate 20, a lower liquid cooling plate liquid outlet 21, a bottom soaking film 22, and a battery core 23.
The connecting row 4 is connected with the positive electrode lugs 3 and the negative electrode lugs 5 among the plurality of battery cells 23, then the connecting row 4 is fastened by bolts, the battery cell modules are clamped by the left end plate 17, the right end plate 1, the left heat insulation plate 16 and the right heat insulation plate 2 on the leftmost side and the rightmost side, and finally the battery modules are formed after being fastened by the peripheral fastening binding bands 14. A left heat insulation plate 16 and a right heat insulation plate 2 are respectively clamped between the leftmost electric core and the left end plate 17 and between the rightmost electric core and the right end plate 1. The top surface of a battery module consisting of a plurality of battery cells 23 is provided with an isolation frame 12, and the isolation frame is fixed by using a sealing structure adhesive; the self structure of the isolation frame can be divided into a front channel, a middle channel and a rear channel, the front channel and the rear channel are filled with heat-conducting filling glue 10 to connect tabs of batteries in the connecting row 4 to form irregular modules left behind the battery module, a top heat equalizing film is arranged on a plane formed by filling the heat-conducting filling glue 10, and a tab liquid cooling plate 8 is arranged on the top heat equalizing film. The bottom of the battery pack is provided with a bottom heat equalizing film 22, a lower liquid cooling plate 20 and a bottom heat insulation pad 19 from top to bottom.
In this embodiment, the battery module charges or discharges, and the battery produces heat, jointly dispels the heat with lower liquid-cooled board 20 high-efficiently through utmost point ear liquid-cooled board 8, and the top soaking membrane all plays the effect of strengthening whole thermal management system horizontal direction heat diffusion with end soaking membrane 22 among the heat dissipation process, and left side heat insulating board 16, right heat insulating board 2 and end heat insulating mattress 19 can prevent stretching when certain electric core thermal runaway in the system, improve system's thermal safety ability.
The invention makes full use of the advantages of small heat transfer resistance at the lug positions of the positive electrode and the negative electrode of the battery core, large specific heat capacity of a refrigerant, high heat conductivity, large heat transfer coefficient, thin boundary layer, strong heat exchange capability, integration and radiation, and good temperature uniformity under the condition of adopting a liquid cooling heat management mode, skillfully arranges the lug liquid cooling plate at the top of the battery, arranges the liquid cooling plate at the bottom of the battery, and realizes high-efficiency heat management by combining heat radiation. The invention can improve the space utilization rate and reliability of the whole thermal management system, ensure that the power battery system always works in the optimal temperature range during operation, enhance the temperature uniformity of the battery cell among different positions in the system and reduce the attenuation speed of the battery performance.
The purpose of the invention is realized by the following technical scheme: the battery heat exchange module comprises a battery module, a battery heat exchange module and a battery structure module. The battery module comprises a battery cell, a positive electrode lug, a negative electrode lug, a safety valve and a battery pack; the battery heat exchange module comprises a polar lug liquid cooling plate, a lower liquid cooling plate, heat conducting filling glue, a top heat equalizing film, a bottom heat equalizing film, a left heat insulation pad, a right heat insulation plate and a bottom heat insulation pad; the battery structural unit comprises a connecting row, an isolation frame, a left end plate, a right end plate and a fastening binding belt. The battery cells are connected through the connecting bar, the left end plate and the right end plate are arranged at the left end and the right end, and fastening binding bands are arranged on the periphery of the battery cells to form a battery pack; for the battery cells with the bolt holes on the positive and negative electrode lugs, connecting a plurality of battery cells into a battery module through a connecting row, arranging through holes matched with the diameters of the lug bolt holes on the connecting row, and using a copper gasket to compensate for the dimensional tolerance of a screw hole and a bolt; for the battery cell without the bolt hole on the positive and negative electrode lugs, welding the connecting bar and the battery cell lugs into a battery module by a laser welding technology; and heat-conducting silicone grease is coated between the battery cell and the side surface of the battery cell.
The periphery of the top surface of the battery module is provided with the bonding structure adhesive, and the upper part of the bonding structure adhesive is provided with the isolation frame; isolation frame upper portion sets up utmost point ear liquid cooling board, sets up graphite alkene soaking membrane in the middle of isolation frame and utmost point ear liquid cooling board, and the horizontal dimension of soaking membrane equals the horizontal dimension of utmost point ear liquid cooling board. The polar lug liquid cooling plate is provided with two liquid inlets and two liquid outlets, and one liquid inlet and one liquid outlet are arranged along the thickness direction of the battery and are independent liquid cooling channels; and lug liquid cooling plate runners are arranged right above the two rows of lugs, and the horizontal size of the liquid cooling plate runners is larger than that of each row of lugs of the battery.
The isolation frame is divided into a front channel, a middle channel and a rear channel, and the positions right above the front channel and the rear channel are just corresponding to the positions of two rows of lugs of the battery module to form two heat-conducting glue filling grooves; the middle channel corresponds to the safety valve to form a pressure relief safety channel; the widths of the front and the rear channels are larger than or equal to the width of the tab connecting module, and the width of the middle channel is larger than the width of a safety valve reserved in the battery cell; the whole height of isolation frame is greater than the height that battery tab and tie bar connect the back protrusion battery top surface, and the isolation frame sets up to hollow structure, and hollow portion's space setting is greater than the irregular space that remains after battery module upper portion utmost point ear tie bar connects. The bottom of the battery module is sequentially provided with a bottom heat equalizing film, a lower liquid cooling plate and a bottom heat insulation pad from top to bottom; a liquid inlet and a liquid outlet are arranged in the middle of the lower liquid cooling plate, and the liquid cooling plate runner structure adopts a multi-branch micro-channel structure in parallel connection. The two liquid inlets arranged on the extreme lug liquid cooling plate and one liquid inlet arranged on the lower liquid cooling plate are connected through a three-way quick-plugging joint and fastened through a hoop; two liquid outlets arranged on the lug liquid cooling plate and one liquid outlet arranged on the bottom liquid cooling plate are connected through a three-way quick plug connector and fastened through a clamp to prevent cooling liquid from leaking; the liquid outlet of the liquid cooling machine is connected with the liquid inlet of the liquid cooling plate, the liquid return port of the liquid cooling machine is connected with the liquid outlet of the liquid cooling plate; the electric core is clamped between the polar lug liquid cooling plate and the lower liquid cooling plate, and a pretightening force applying device is arranged.
Claims (1)
1. The utility model provides a radiating power battery thermal management system of liquid cooling based on utmost point ear and module bottom are united, characterized by: the liquid cooling plate comprises a first liquid cooling plate liquid inlet, a second liquid cooling plate liquid inlet, a first liquid cooling plate liquid outlet, a second liquid cooling plate liquid outlet, a first tee liquid cooling plate liquid inlet, a second tee liquid cooling plate liquid outlet, and a second tee liquid cooling plate liquid outlet, wherein positive and negative electrode lugs between the battery cells are connected through a connecting row; the first lug liquid cooling plate liquid inlet and the first lug liquid cooling plate liquid outlet, and the second lug liquid cooling plate liquid inlet and the second lug liquid cooling plate liquid outlet form independent liquid cooling channels respectively along the thickness direction of the battery, the liquid cooling channels are arranged right above the two rows of lugs, and the horizontal size of the liquid cooling channels is larger than that of each row of lugs;
the whole height of isolation frame is greater than the height that battery tab and tie bar connect the back protrusion battery module, and isolation frame is hollow structure, and hollow portion's space setting is greater than the irregular space that remains after battery module upper portion utmost point ear tie bar connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010232874.5A CN111403853B (en) | 2020-03-28 | 2020-03-28 | Power battery thermal management system based on joint liquid cooling heat dissipation of utmost point ear and module bottom |
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| CN202010232874.5A CN111403853B (en) | 2020-03-28 | 2020-03-28 | Power battery thermal management system based on joint liquid cooling heat dissipation of utmost point ear and module bottom |
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| CN111403853A CN111403853A (en) | 2020-07-10 |
| CN111403853B true CN111403853B (en) | 2023-04-18 |
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| KR20210011640A (en) * | 2019-07-23 | 2021-02-02 | 에스케이이노베이션 주식회사 | Battery module |
| CN113036259A (en) * | 2021-03-04 | 2021-06-25 | 湖北亿纬动力有限公司 | Battery module and battery pack |
| CN113094768A (en) * | 2021-04-01 | 2021-07-09 | 中汽研（天津）汽车工程研究院有限公司 | Thermal management-thermal runaway joint simulation method for power battery system |
| CN216120451U (en) * | 2021-07-20 | 2022-03-22 | 宁德时代新能源科技股份有限公司 | End cover assembly, battery monomer, battery and device using battery |
| CN113690510B (en) * | 2021-08-26 | 2023-06-30 | 安徽江淮汽车集团股份有限公司 | Explosion-proof liquid cooling structure of cylinder battery module |
| CN114156560A (en) * | 2021-11-30 | 2022-03-08 | 中国电力科学研究院有限公司 | Immersed liquid cooling heat dissipation module and heat dissipation method |
| CN114421052A (en) * | 2022-01-18 | 2022-04-29 | 吉林大学 | Integral liquid cooling plate cooling system with graphene coating |
| WO2024021110A1 (en) * | 2022-07-29 | 2024-02-01 | 华为技术有限公司 | Cooling system, battery system and electric vehicle |
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