CN116345011B - Battery module and battery pack - Google Patents
Battery module and battery pack Download PDFInfo
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- CN116345011B CN116345011B CN202310629251.5A CN202310629251A CN116345011B CN 116345011 B CN116345011 B CN 116345011B CN 202310629251 A CN202310629251 A CN 202310629251A CN 116345011 B CN116345011 B CN 116345011B
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- 239000012782 phase change material Substances 0.000 claims abstract description 108
- 230000017525 heat dissipation Effects 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 8
- 230000004308 accommodation Effects 0.000 claims description 5
- 230000003245 working effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 21
- 230000008859 change Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 239000007792 gaseous phase Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 10
- 238000001816 cooling Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 4
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- 230000008016 vaporization Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
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- 230000035939 shock Effects 0.000 description 2
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- 229920006351 engineering plastic Polymers 0.000 description 1
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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
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
-
- 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
-
- 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
-
- 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
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
-
- 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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- 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 provides a battery module and a battery pack, wherein the battery module comprises: the battery module comprises a plurality of battery cells which are sequentially connected, wherein a first temperature equalizing plate is arranged on the side face of the battery module in the length direction of the battery module, a first flow passage which extends in the length direction is arranged in the first temperature equalizing plate and is used for containing liquid-gas phase change materials, and the height of an area, close to at least one end of the battery module, of the first flow passage is larger than that of an area, close to the middle of the battery module, of the first flow passage. The battery module and the battery pack provided by the application have the advantages of simple structure, convenience and rapidness in assembly and high space utilization rate, and can effectively balance the temperature difference between the middle part and the end part of the battery module, improve the working effect of the battery module and prolong the service life of the battery core.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery module and a battery pack.
Background
The power battery is used as a main power source of the electric automobile, the power battery has been rapidly applied and developed, the overall performance of the power battery is obviously affected by temperature, when the temperature is too high, the electric core active substances in the battery module are enhanced, irreversible chemical reaction can occur, so that thermal runaway is caused to cause the ignition and explosion of the vehicle, and the like, therefore, the battery module with the too high temperature needs to be rapidly cooled, and common cooling modes comprise adding a cooling device at the bottom or the top of the battery module to cool.
The battery module is formed by stacking a plurality of battery cells, and the battery cell that is located the battery module middle part is poor in the battery cell radiating effect that is located the battery module tip, leads to the temperature at battery module middle part to be higher than the temperature of tip, has formed great difference in temperature, and current heat abstractor mainly dispels the heat to the battery module is whole, can not balance this difference in temperature, and the operating temperature between the battery cell is different, can influence its work effect to whole heat dissipation leads to high temperature battery cell temperature too fast decay, also can reduce circulation life, consequently, need a battery module that can simply effectively balance the battery cell difference in temperature.
Disclosure of Invention
The present application is directed to a battery module and a battery pack for solving the above-mentioned problems.
In a first aspect of the present application, there is provided a battery module comprising: the battery module comprises a plurality of battery cells which are sequentially connected, wherein a first temperature equalizing plate is arranged on the side face of the battery module in the length direction of the battery module, a first flow passage which extends in the length direction is arranged in the first temperature equalizing plate and is used for containing liquid-gas phase change materials, and the height of an area, close to at least one end of the battery module, of the first flow passage is larger than that of an area, close to the middle of the battery module, of the first flow passage.
In some embodiments, a second temperature equalizing plate is arranged on the side surface of the battery module along the width direction, the second temperature equalizing plate is connected with the first temperature equalizing plate, a second flow channel extending along the width direction is arranged in the second temperature equalizing plate, the second flow channel is communicated with the corresponding first flow channel, and the height of the second flow channel is larger than that of the first flow channel; preferably, the second temperature equalizing plate is arranged with the cell gap.
In some embodiments, the cross-sectional area of the first flow channel near the middle of the battery module is greater than the cross-sectional area of the first flow channel near the end of the battery module; the radial sectional area of the second flow channel is larger than that of the first flow channel near the end part of the battery module.
In some embodiments, a plurality of first flow channels are arranged in the first temperature equalizing plate, and the end parts of at least two first flow channels are communicated; and/or a plurality of second flow passages are arranged in the second temperature equalizing plate, and at least two second flow passages are communicated.
In some embodiments, the first flow channel includes a primary heat exchange flow channel extending from one end of the first temperature equalizing plate to the other end thereof, and a secondary heat exchange flow channel disposed in an area of the first temperature equalizing plate other than the primary heat exchange flow channel; preferably, the length of the primary heat exchange flow channel is greater than the length of the secondary heat exchange flow channel.
In some embodiments, one end of the first temperature equalizing plate is connected with the second temperature equalizing plate, the ends of the plurality of first flow channels located at one end of the first temperature equalizing plate far away from the second temperature equalizing plate are communicated, and the height of the main heat exchange flow channel located at the top gradually rises along the direction from the first temperature equalizing plate to the second temperature equalizing plate.
In some embodiments, a receiving cavity is formed in the middle of the main heat exchange flow channel, and the height of one end of the receiving cavity, which is close to the second temperature equalizing plate, is greater than the height of one end, which is far away from the second temperature equalizing plate.
In some embodiments, the main heat exchange flow channel comprises at least two branch flow channels which are arranged in a stacked manner and are communicated, each branch flow channel is provided with the accommodating cavity, the communication position of the at least two branch flow channels is positioned at one side of the accommodating cavity away from the second temperature equalizing plate, and the height of one end, close to the second temperature equalizing plate, of the accommodating cavity positioned below is larger than that of the communication position; preferably, the communicating part is close to one end of the accommodating cavity far away from the second temperature equalizing plate.
In a second aspect of the present application, there is provided a battery pack comprising: a housing in which the battery module according to the first aspect is mounted.
In some embodiments, a second temperature equalizing plate is arranged on the side surface of the battery module along the width direction, a heat conducting layer is arranged between the second temperature equalizing plate and the side wall of the shell, radiating fins are arranged outside the corresponding side wall of the shell, and the side surface of the second temperature equalizing plate is obliquely downwards arranged towards the heat conducting layer so that the second temperature equalizing plate extrudes the heat conducting layer and further extrudes the side wall of the shell; the heat dissipation fin is characterized in that a baffle is arranged outside the heat dissipation fin, the length of the baffle is larger than that of the heat dissipation fin, and an exhaust hole is formed in the middle of the baffle.
From the above, the application provides a battery module and a battery pack, wherein the battery module comprises a plurality of electric cores which are sequentially stacked and arranged, a first temperature equalizing plate is arranged on the side surface of each electric core along the length direction of the battery module, and the first temperature equalizing plate covers each electric core at the middle part and the end part of the battery module, so that a basis is provided for balancing temperature difference; a first flow passage along the length direction is arranged in the first temperature equalizing plate, and is used for containing liquid-gas phase change materials, and when the temperature of the battery module is too high, the phase change materials are gasified and absorbed to absorb the heat of the battery core so as to reduce the temperature; the height of the area of the first flow channel positioned at least one end of the battery module is larger than the height of the area positioned in the middle of the battery module, when the temperature of the middle of the battery module is higher, the phase change material in the middle absorbs heat and gasifies, the gaseous phase change material gradually rises due to low density, the gaseous phase change material can move to at least one end of the battery module along with the first flow channel, the temperature of the middle of the battery module is transferred to the end, the temperature difference between the electric cores is balanced, no additional energy driving is needed, the balanced temperature difference can be realized by means of the liquid-gas phase change material and the first flow channels with different heights, and the first temperature equalizing plate is arranged on the side surface, so that the electric cores are not split to damage the integrity of the battery module, the assembly is convenient, and the space utilization rate is high; the battery module and the battery pack are simple in structure, convenient and fast to assemble, high in space utilization rate, capable of effectively balancing the temperature difference between the middle part and the end part of the battery module, improving the working effect of the battery module and prolonging the service life of the battery cell.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a schematic structural view of a first battery module according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of the first temperature uniformity plate in FIG. 1;
fig. 3 is a schematic structural view of a second battery module according to an embodiment of the present application;
FIG. 4 is a schematic view showing the unfolding structure of the first temperature-equalizing plate and the second temperature-equalizing plate in FIG. 3;
fig. 5 is a schematic structural view of a third battery module according to an embodiment of the present application;
FIG. 6 is a schematic view showing an expanded structure of the first and second temperature plates in FIG. 5;
fig. 7 is a schematic view illustrating an explosion structure of a fourth battery module according to an embodiment of the present application;
FIG. 8 is a schematic view showing the expanded structures of the first and second temperature plates in FIG. 7;
FIG. 9a is a schematic view of a first modified first flow channel and a second flow channel according to an embodiment of the present application;
FIG. 9b is a schematic flow diagram illustrating the phase change material of FIG. 9a injected;
FIG. 9c is a schematic flow diagram illustrating the phase change material of FIG. 9a in vaporization;
FIG. 9d is a schematic flow diagram illustrating the phase change material of FIG. 9a in liquefaction;
FIG. 10a is a schematic view of a second modified first flow channel and a second flow channel according to an embodiment of the present application;
FIG. 10b is a schematic flow diagram illustrating the phase change material of FIG. 10a being injected;
FIG. 10c is a schematic flow diagram illustrating the vaporization of the phase change material of FIG. 10 a;
FIG. 10d is a schematic flow diagram illustrating the phase change material of FIG. 10a in a liquefied state;
FIG. 11a is a schematic view of a third modified first flow channel and a second flow channel according to an embodiment of the present application;
FIG. 11b is a schematic flow diagram illustrating the phase change material of FIG. 11a being injected;
FIG. 11c is a schematic flow diagram illustrating the phase change material of FIG. 11a in vaporization;
FIG. 11d is a schematic flow diagram illustrating the phase change material of FIG. 11a in liquefaction;
fig. 12 is a schematic view illustrating an exploded structure of a battery pack according to an embodiment of the present application;
fig. 13 is a schematic cross-sectional structure of the battery pack of fig. 12;
FIG. 14 is an enlarged structural intent at W in FIG. 13;
fig. 15 is a schematic structural view of a baffle according to an embodiment of the present application.
Reference numerals: 1. a battery module; 1-1, a busbar; 1-2, a bracket; 2. a battery cell; 3. a first temperature equalizing plate; 4. a first flow passage; 4-1, a main heat exchange runner; 4-1-1, branch flow passages; 4-2, auxiliary heat exchange flow channels; 5. an end plate; 6. a second temperature equalizing plate; 7. a second flow passage; 7-1, a liquid injection port; 8. a housing; 8-1, a lower shell; 8-2, an upper shell; 8-3, sealing the flange; 9. a heat conducting layer; 10. a heat radiation fin; 11. a baffle; 11-1, an exhaust hole.
Detailed Description
The present application will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The power battery is used as a main power source of the electric automobile, the power battery has been rapidly applied and developed, the overall performance of the power battery is obviously affected by temperature, when the temperature is too high, the electric core active substance in the battery module is enhanced, irreversible chemical reaction can occur, so that thermal runaway is caused to cause the ignition and explosion of the automobile, and the like, so that the battery module with the too high temperature needs to be rapidly cooled, common cooling modes comprise adding cooling devices such as air cooling, liquid cooling, heat pipe cooling or phase change cooling at the bottom or the top of the battery module, and the phase change cooling obtains the favor of battery manufacturers with the advantages of simple structure, convenient maintenance, no consumption of extra energy, and the like.
The battery module is formed by stacking a plurality of battery cells, and compared with the battery cells positioned at the end parts of the battery module, the battery cells positioned in the middle of the battery module have poor heat dissipation effect, so that the temperature in the middle of the battery module is higher than that of the end parts, a larger temperature difference is formed, the existing heat dissipation device mainly dissipates heat for the whole battery module, the temperature difference cannot be balanced, the working temperatures among the battery cells are different, the working effect of the battery cells is influenced, the temperature of the high-temperature battery cells is attenuated too fast due to the whole heat dissipation, and the cycle service life is also reduced; in some battery modules, an independent phase-change heat dissipation device is arranged between each battery core in the middle of the battery module so as to balance the temperature difference, but the integrity of the battery module is damaged by a plurality of phase-change heat dissipation devices, and the battery module can be assembled by the single battery core after the single battery core is matched with the phase-change heat dissipation device, so that time and labor are wasted; still some battery modules can set up the phase change heat abstractor between all electric cores to make the intercommunication between each phase change heat abstractor, then drive phase change material through external drive equipment and flow, with balanced difference in temperature, the structure is complicated, has destroyed battery module integrality, and needs extra driving force, and the power consumption is higher, consequently, need a battery module that can simply effectively balance electric core difference in temperature.
The following describes the technical solution of the present application in detail by specific embodiments in conjunction with fig. 1 to 15.
In some embodiments of the present application, there is provided a battery module 1, as shown in fig. 1 and 2, including: the battery module comprises a plurality of battery cells 2 which are sequentially connected, wherein a first temperature equalizing plate 3 is arranged on the side face of the battery module 1 in the length direction of the battery cells 2, a first flow passage 4 which extends in the length direction is arranged in the first temperature equalizing plate 3, the first flow passage 4 is used for containing liquid-gas phase change materials, and the height of an area, close to at least one end of the battery module 1, of the first flow passage 4 is larger than that of an area, close to the middle of the battery module 1, of the first flow passage 4.
The battery module 1 comprises a plurality of battery cells 2 which are sequentially connected, wherein the battery cells 2 are square shell battery cells 2 and the like, and are not particularly limited, as shown in fig. 1, the L direction in the drawing is the length direction of the battery module 1, the W direction is the width direction of the battery module 1, a first temperature equalizing plate 3 is arranged along the side surface of the length direction of the battery module 1, the material of the first temperature equalizing plate 3 is heat conducting metal, the first temperature equalizing plate 3 covers each battery cell 2 at the middle part and the end part of the battery module 1, and a basis is provided for balancing temperature difference; adopt heat conduction structure to glue between first samming board 3 and electric core 2 and be connected, can be like this with electric core 2 heat conduction to first samming board 3, provide bonding strength simultaneously, first samming board 3 plays the protection constraint effect to electric core 2, improves battery module 1 shock-resistant, shock resistance etc. security performance.
As shown in fig. 2, a first flow channel 4 extending along the length direction is provided in the first temperature equalizing plate 3, and the first flow channel 4 is used for containing a liquid-gas phase change material, for example, an ethanol solution, an acetone solution, or the like, which is not particularly limited, and when the temperature of the battery module 1 is too high, the heat of the battery cell 2 is absorbed by the phase change material through vaporization to reduce the temperature.
The height of the area of the first flow channel 4 positioned at least one end of the battery module 1 is larger than the height of the area positioned at the middle of the battery module 1, as shown in fig. 2, the height of the first flow channel 4 gradually rises along the direction from the middle to the end of the battery module 1, when the temperature of the middle of the battery module 1 is higher, the phase change material in the middle can absorb heat and gasify, the gaseous phase change material gradually rises because of low density, the gaseous phase change material can move to at least one end of the battery module 1 along with the first flow channel 4, the temperature of the middle of the battery module 1 is transferred to the end, the temperature difference between the battery cells 2 is balanced, no additional energy driving is needed, the balanced temperature difference can be realized by means of the liquid-gas phase change material and the first flow channel 4 with different heights, and because the first temperature equalizing plate 3 is arranged on the side, the integrity of the battery module 1 can not be broken, the assembly is convenient, and the space utilization is high.
In addition, after the heat at the end of the battery module 1 is transferred, the gaseous phase-change material is liquefied, and the liquid phase-change material can flow back to the middle of the battery module 1 along with the first flow channel 4, so that the reciprocating cycle is realized.
The battery module 1 is simple in structure, convenient and fast to assemble, high in space utilization rate, capable of effectively balancing the temperature difference between the middle part and the end part of the battery module 1, improving the working effect of the battery module 1 and prolonging the service life of the battery cell 2.
In some embodiments, as shown in fig. 1, two side surfaces of the battery module 1 along the length direction are respectively provided with a first temperature equalizing plate 3, so as to further improve the effect of balancing the temperature difference between the battery cells 2.
In some embodiments, as shown in fig. 3 to 8, a second temperature equalizing plate 6 is disposed on a side surface of the battery module 1 along the width direction, the second temperature equalizing plate 6 is connected with the first temperature equalizing plate 3, a second flow channel 7 extending along the width direction is disposed in the second temperature equalizing plate 6, the second flow channel 7 communicates with the corresponding first flow channel 4, and the height of the second flow channel 7 is greater than that of the first flow channel 4.
As shown in fig. 3 to 8, in the drawing, the L direction is the length direction of the battery module 1, the W direction is the width direction of the battery module 1, two ends of the battery module 1 are respectively provided with an end plate 5, the outer side of the end plate 5 is provided with a second temperature equalizing plate 6, so that the second temperature equalizing plate 6 and the battery core 2 are arranged in a gap, the end plate 5 is made of engineering plastics, for example, and can be glued on the battery core 2, so as to play a role in protecting and restraining the battery core 2, and the end plate 5 can be made of insulating materials, or an insulating sheet is arranged between the end plate 5 and the battery core 2, so that the insulating effect of the battery module 1 is improved; preferably, the second temperature equalizing plate 6 and the electric core 2 are arranged in a gap, the second temperature equalizing plate 6 and the electric core 2 can play a role in heat insulation, the heat dissipation of the end part of the battery module 1 is avoided to be too fast, and the temperature difference between the end part and the middle part of the battery module 1 is increased.
The second temperature-equalizing plate 6 is connected with the first temperature-equalizing plate 3, the second temperature-equalizing plate 6 and the first temperature-equalizing plate 3 are the same in material and can be of an integrated structure, and the first temperature-equalizing plate 3 and the second temperature-equalizing plate 6 can be fixed on the end plate 5 through self-plugging rivets; the second flow channel 7 communicated with the first flow channel 4 is arranged in the second temperature equalizing plate 6, and the height of the second flow channel 7 is higher than that of the first flow channel 4, so that when the temperature of the middle part of the battery module 1 is overhigh, the phase change material in the middle part is gasified, and the heat of the side surface of the battery module 1 is transferred to the end plate 5 along with the movement of the first flow channel 4 to the second flow channel 7, so as to provide a basis for the concentrated heat dissipation of the battery module 1, for example, the heat dissipation fins 10 can be arranged on the outer side of the second temperature equalizing plate 6, so that the heat of the middle part of the battery module 1 can be transferred to the outside through the heat dissipation fins 10 at the end plate 5, and the space utilization rate can be improved because one battery pack usually comprises a plurality of battery modules 1 for dissipating heat at the side surface of each battery module 1.
In some embodiments, as shown in fig. 3 and fig. 4, two sides of the battery module 1 along the length direction are respectively provided with a first temperature equalizing plate 3, two sides of the first temperature equalizing plate 3 are connected with a second temperature equalizing plate 6, so that heat at one side of the battery module 1 can be transferred to end plates 5 at two ends, and the concentrated heat dissipation effect is further improved; the area of every second samming board 6 is the half of end plate 5 area, makes things convenient for the heat of battery module 1 both sides to all can shift the end plate 5 department at both ends, further improves concentrated radiating effect.
In some embodiments, as shown in fig. 5 and 6, two sides of the battery module 1 in the length direction are respectively provided with a first temperature equalizing plate 3, one side of the first temperature equalizing plate 3 is connected with a second temperature equalizing plate 6, and the area of each second temperature equalizing plate 6 is equal to the area of the end plate 5, so that heat at one side of the battery module 1 can be transferred to the end plate 5 at one end; the second temperature equalizing plates 6 connected with the two first temperature equalizing plates 3 are reversely arranged, so that heat on two sides of the battery module 1 is conveniently transferred to the corresponding end plate 5 respectively, the concentrated heat dissipation effect is further improved, and the heat exchange plate is more convenient to process compared with the heat exchange plate of FIG. 6.
In some embodiments, as shown in fig. 7 and 8, two sides of the battery module 1 along the length direction are respectively provided with one first temperature equalizing plate 3, the same end plate 5 is provided with two second temperature equalizing plates 6, and each second temperature equalizing plate 6 is connected with the corresponding first temperature equalizing plate 3.
The battery module 1 is equipped with a first samming board 3 respectively along two sides of length direction, one side of first samming board 3 is connected with a second samming board 6, the area of every second samming board 6 is half of end plate 5 area, two second samming boards 6 set up outside same end plate 5, three face parcel formula structure has been formed to battery module 1 like this, the heat of battery module 1 both sides can be transferred to end plate 5 department of same end and concentrate the heat dissipation, space utilization has been improved, end plate 5 department of the other end can set up circuits such as thermal management system generally, inconvenient other heat radiation structure of setting up again.
In some embodiments, as shown in fig. 9a to 11d, the cross-sectional area of the first flow channel 4 near the middle of the battery module 1 is larger than the cross-sectional area of the first flow channel 4 near the end of the battery module 1; the radial sectional area of the second flow channel 7 is larger than the radial sectional area of the end portion of the first flow channel 4, which is close to the battery module 1.
The sectional area of the area where the first flow channel 4 is arranged in the middle of the battery module 1 is larger than the sectional area of the area where the first flow channel 4 is arranged at the end of the battery module 1, for example, the radial sectional area of the middle of the first flow channel 4 is larger than the radial sectional area of the end, the sectional area of the middle of the first flow channel 4 is increased to form a containing cavity, and as shown in fig. 9a, the containing cavities of A1 and B1 are formed in the middle of the battery module 1; as shown in fig. 10a, the battery module 1 has a receiving chamber of A2 and B2 formed at the middle thereof; as shown in fig. 11a, the middle part of the battery module 1 forms a containing cavity of A3, B3 and C3, so that the middle part of the first flow channel 4 can contain more liquid phase change materials, the heat exchange area is increased, the space utilization rate of the first temperature equalizing plate 3 is improved, the heat absorbing effect on the middle part of the battery module 1 is increased, and the rate of balancing the temperature difference can be accelerated.
The radial sectional area of the second flow channel 7 is larger than the radial sectional area of the first flow channel 4 at the end part of the battery module 1, and the radial sectional area of the second flow channel 7 is increased to form a containing area, as shown in fig. 9a, and the end part of the battery module 1 forms containing areas a1, b1 and c 1; as shown in fig. 10a, the end of the battery module 1 forms receiving regions b2, c2, and d 2; as shown in fig. 11a, the end of the battery module 1 forms the receiving areas a3, b3, c3 and d3, so that the second flow channel 7 can receive more gaseous phase change materials, the heat exchange area is increased, the space utilization rate of the second temperature equalizing plate 6 is improved, the concentrated heat dissipation effect of the battery module 1 is increased, and the rate of balancing the temperature difference can be increased as well.
In some embodiments, as shown in fig. 9a to 11d, a plurality of first flow channels 4 are provided in the first temperature equalizing plate 3, and ends of at least two first flow channels 4 are communicated; and/or, a plurality of second flow passages 7 are arranged in the second temperature equalizing plate 6, and at least two second flow passages 7 are communicated.
As shown in fig. 9a to 11d, the first temperature equalizing plate 3 is provided with a plurality of first flow channels 4, if the first flow channels 4 are independent, on one hand, the space utilization rate is low, on the other hand, each first flow channel 4 needs to be provided with a liquid injection port 7-1 respectively, so that filling of liquid-gas phase change materials is performed, the operation is troublesome, the tightness is poor, and therefore, the end parts of at least two first flow channels 4 are communicated, so that the space utilization rate of the first temperature equalizing plate 3 is increased, filling of a plurality of first flow channels 4 can be realized by arranging a small number of liquid injection ports 7-1, the process is simplified, and the tightness is improved.
The second temperature equalizing plate 6 is internally provided with a plurality of second flow passages 7, as shown in fig. 9a to 9d, and part of the second flow passages 7 are communicated, so that the space utilization rate of the first temperature equalizing plate 3 can be increased; when the temperature in the middle of the battery module 1 is too high, the phase change material in the middle of the first flow channel 4 can move to the communication position of the second flow channel 7 when the phase change material is gasified, but when the second flow channel 7 exchanges heat to the outside, the phase change material in the communication position of the second flow channel 7 can preferentially move to the first flow channel 4 below under the action of gravity when the phase change material is liquefied, so that the phase change material cannot be born again by the first flow channel 4 above, and the temperature equalizing function cannot be recovered quickly.
In some embodiments, at least one of the second flow channel 7 or the first flow channel 4 is provided with a liquid injection port 7-1, so as to facilitate the injection of the phase change material.
In some embodiments, as shown in fig. 9a to 11d, the first flow channel 4 includes a main heat exchange flow channel 4-1 and an auxiliary heat exchange flow channel 4-2, the main heat exchange flow channel 4-1 extends from one end of the first temperature equalizing plate 3 to the other end, and the auxiliary heat exchange flow channel 4-2 is disposed in a region of the first temperature equalizing plate 3 except for the main heat exchange flow channel 4-1.
The main heat exchange flow channel 4-1 extends from one end of the first temperature equalizing plate 3 to the other end, that is, the length of the main heat exchange flow channel 4-1 is close to the length of the first temperature equalizing plate 3, the main heat exchange flow channel 4-1 may be disposed at the middle upper part of the first temperature equalizing plate 3, because the cross-sectional area of the middle part of the first flow channel 4 is larger than that of the end part, so that space remains at the end part of the first temperature equalizing plate 3, in order to improve space utilization, an auxiliary heat exchange flow channel 4-2 may be disposed at the region of the first temperature equalizing plate 3 except for the main heat exchange flow channel 4-1, the length of the main heat exchange flow channel 4-1 is larger than that of the auxiliary heat exchange flow channel 4-2, for example, the length of the auxiliary heat exchange flow channel 4-2 is smaller than half the length of the first temperature equalizing plate 3, and may be disposed at the middle lower part of the first temperature equalizing plate 3.
As shown in fig. 9a, the three primary heat exchange channels 4-1 and two secondary heat exchange channels 4-2 are included; as shown in fig. 10a, the heat exchange tube comprises three main heat exchange flow passages 4-1 and two auxiliary heat exchange flow passages 4-2; as shown in fig. 11a, three primary heat exchange channels 4-1 and four secondary heat exchange channels 4-2 are included.
In some embodiments, as shown in fig. 9a to 11d, one end of the first temperature equalizing plate 3 is connected to the second temperature equalizing plate 6, the ends of the plurality of first flow channels 4 located at the end of the first temperature equalizing plate 3 away from the second temperature equalizing plate 6 are communicated, and the height of the main heat exchanging flow channel 4-1 located at the top gradually increases along the direction from the first temperature equalizing plate 3 to the second temperature equalizing plate 6.
The plurality of first flow passages 4 are communicated at one end of the first temperature equalizing plate 3 far away from the second temperature equalizing plate 6, so that the space utilization rate of the first temperature equalizing plate 3 is increased, the plurality of first flow passages 4 can be filled by arranging one main liquid filling port 7-1, the process is simplified, and the sealing performance is improved.
As shown in fig. 9a to 11d, the X direction is the direction from the first temperature equalizing plate 3 to the second temperature equalizing plate 6, because the ends of the plurality of first flow channels 4 far away from the second temperature equalizing plate 6 are communicated, the partially gasified phase change material is converged at the top-most main heat exchange flow channel 4-1 when moving away from the second temperature equalizing plate 6; the height of the main heat exchange flow channel 4-1 is gradually increased along the X direction on the basis, so that the phase change material can be guided to be quickly transferred to the second flow channel 7 for heat exchange, and the uniform temperature heat dissipation effect is further improved; after the phase change material in the top second flow channel 7 is liquefied, the phase change material can also rapidly move along the main heat exchange flow channel 4-1 and be transferred to other first flow channels 4, so that rapid reset is realized.
In some embodiments, as shown in fig. 10a to 11d, a receiving cavity is formed in the middle of the main heat exchange flow channel 4-1, and the height of one end of the receiving cavity, which is close to the second temperature equalizing plate 6, is greater than the height of one end, which is far away from the second temperature equalizing plate 6.
As shown in fig. 10a, the middle part of the main heat exchange flow channel 4-1 forms a containing cavity of A2 and B2; as shown in FIG. 11a, the middle part of the main heat exchange flow channel 4-1 is provided with accommodating cavities A3, B3 and C3 to increase the heat exchange area and improve the temperature equalizing effect.
As shown in fig. 11b, the inflection point i is one end of the C3 accommodating cavity away from the second temperature equalizing plate 6, the inflection point iii is one end of the C3 accommodating cavity close to the second temperature equalizing plate 6, when the phase change material in the C3 accommodating cavity absorbs heat and gasifies, the gaseous phase change material moves to two ends, a part of the gaseous phase change material moves from the inflection point iii to the C3 accommodating area directly, and the path is shorter; the other part of the gaseous phase change material moves from the first flow passage 4 at the top of the I inflection point path to the a3 accommodating area, and the path is longer; the height of one end of the accommodating cavity close to the second temperature equalizing plate 6 is larger than that of one end of the accommodating cavity far away from the second temperature equalizing plate 6, namely III inflection point height is larger than that of I inflection point, when the phase change material in the C3 accommodating cavity absorbs heat and gasifies, the phase change material is more prone to moving to a higher port, namely III inflection point, so that most of gaseous phase change material can directly move to a C3 accommodating area from III inflection point, and a small part of gaseous phase change material can move to an a3 accommodating area from a first runner 4 at the top of an I inflection point path, and the overall temperature equalizing speed is higher; and because the phase change material after a plurality of holding cavities gasify all can move to an A3 holding area through the first flow channel that A3 held the chamber place, through setting up III inflection point height and being greater than I inflection point height, reduce the tolerance of the phase change material who moves to A3 holding cavity, can reduce the atmospheric pressure of the first flow channel that A3 held the chamber place, avoid weakening the speed that phase change material moved to an 3 holding area.
In some embodiments, the end of at least one auxiliary heat exchange flow channel 4-2 is communicated with the end of the accommodating cavity, as shown in fig. 11b, the auxiliary heat exchange flow channel 4-2 where the D3 area is located is communicated with the end of the C3 accommodating cavity, and the communication position is at the inflection point of i, so that the space utilization rate of the first temperature equalizing plate 3 is increased, the C3 accommodating cavity can be filled rapidly through the inflection point of i when the phase change material is filled, and the filling speed is increased; and the D3 area can be filled up through the I inflection point when the phase change material is liquefied, so that the temperature equalization function can be recovered rapidly.
In some embodiments, as shown in fig. 11a to 11d, the main heat exchange flow channel 4-1 includes at least two branch flow channels 4-1-1 that are stacked and communicated, each branch flow channel 4-1-1 is formed with the accommodating cavity, the communicating position of at least two branch flow channels 4-1-1 is located at a side of the accommodating cavity away from the second temperature equalizing plate 6, and the height of one end of the accommodating cavity located below and close to the second temperature equalizing plate 6 is greater than the height of the communicating position.
As shown in fig. 11B, the main heat exchange flow channel 4-1 includes two branch flow channels 4-1-1 which are arranged in a stacked manner and are communicated, a C3 accommodating cavity is formed on the branch flow channel 4-1-1 at the lower part, a B3 accommodating cavity is formed on the branch flow channel 4-1-1 at the upper part, and the communicating part of the two branch flow channels 4-1-1, that is, the inflection point ii, is located at one side of the accommodating cavity far away from the second temperature equalizing plate 6, and corresponds to sharing the same section of the first flow channel 4, so that when the phase change material is filled, the two accommodating cavities can be filled through the same section of the first flow channel 4, when the C3 accommodating cavity is filled, the B3 accommodating cavity is filled again, preferably, the communicating part is arranged close to one end of the two accommodating cavities far away from the second temperature equalizing plate 6, so that the length of the shared first flow channel 4 can be increased, and thus the shared first flow channel 4 can reserve a larger gas space after the B3 accommodating cavity is filled, so as to accommodate the gasified phase change material, and heat exchange effect is improved.
As shown in fig. 11B, the end of the C3 accommodating cavity near the second temperature equalizing plate 6 is at the inflection point iii, and the accommodating cavity below is set to be close to the end of the second temperature equalizing plate 6, where the height of the inflection point iii is greater than the height of the inflection point ii, so that after the filling of the phase change material into the C3 accommodating cavity, the phase change material can preferentially move to the B3 accommodating cavity for filling through the inflection point ii, but not fill the remaining first flow channels 4 through the inflection point iii, so that more gas space can be reserved for the first flow channels 4 to accommodate the gasified phase change material, the temperature equalizing effect is improved, and the first flow channels 4 where the C3 accommodating cavity is completely filled with the phase change material to influence the movement of the gasified phase change material is avoided.
In some embodiments, as shown in fig. 9a, one end of the plurality of first flow channels 4 far away from the second temperature equalizing plate 6 is provided to communicate, and part of the second flow channels 7 is provided to communicate, so as to increase space utilization, as shown in fig. 9b, the second flow channels 7 comprise two liquid injection ports 7-1, and two injection lines are included when the first flow channels 4 are injected, wherein the first line is formed by moving phase change material from an a1 accommodating area to a C1 area; after the C1 area is filled, the phase change material moves from the a1 accommodating area to the B1 accommodating cavity; after the B1 accommodating cavity is filled, the phase change material moves from the A1 accommodating area to the A1 accommodating cavity; the second stripe is the phase change material moving from the c1 accommodation region to the D1 region.
When the temperature in the middle of the battery module 1 is too high and the phase change material is gasified, as shown in fig. 9C, the phase change material in the C1 region moves to the a1 accommodating region; part of the phase change material in the accommodating cavity B1 moves to the accommodating area B1, and the other part moves to the accommodating area a 1; one part of the phase change material of the A1 accommodating cavity moves to the b1 accommodating area, and the other part moves to the A1 accommodating area; the phase change material of the D1 region moves to the c1 accommodating region.
When the second flow channel 7 exchanges heat to the outside and the phase change material is liquefied, as shown in fig. 9D, the phase change material in the c1 accommodating area moves to the D1 area; the phase change material of the a1 accommodating area moves to the C1 area; the phase change material in the B1 accommodating area preferentially moves to the B1 accommodating cavity, and after the B1 accommodating cavity is filled, the phase change material can only move to the A1 accommodating cavity, so that the A1 accommodating cavity is not easy to bear the phase change material again, the middle part of the battery module 1 cannot be recovered rapidly to absorb heat continuously, and the temperature equalizing effect is relatively poor.
In some embodiments, as shown in fig. 10a, one end of the plurality of first flow channels 4 far away from the second temperature equalizing plate 6 is arranged to communicate so as to increase space utilization, as shown in fig. 10b, the second flow channels 7 comprise two liquid injection ports 7-1, and when the first flow channels 4 are filled, two filling lines are included, wherein the first line is formed by moving phase change material from an a2 area to a C2 area; after the C2 area is filled, the phase change material moves from the a2 area to the B2 accommodating cavity; after the B2 accommodating cavity is filled, the phase change material moves from the A2 area to the A2 accommodating cavity; the second stripe is the phase change material moving from the D2 accommodation area to the D2 area.
When the temperature in the middle of the battery module 1 is too high and the phase change material is gasified, as shown in fig. 10C, the phase change material in the C2 region moves to the a2 region; one part of the phase change material of the B2 accommodating cavity moves to the c2 accommodating area, and the other part moves to the a2 area; one part of the phase change material of the A2 accommodating cavity moves to the b2 accommodating area, and the other part moves to the A2 area; the phase change material of the D2 region moves to the D2 accommodating region.
When the second flow channel 7 exchanges heat to the outside and the phase change material is liquefied, as shown in fig. 10D, the phase change material in the D2 accommodating area moves to the D2 area; the phase change material in the A2 area preferentially moves to the C2 area, and after the C2 area is filled, the phase change material is transferred to the B2 accommodating cavity and the A2 accommodating cavity; b2 the phase change material of the accommodating area moves to the accommodating cavity A2; the phase change material of the c2 accommodating area moves to the B2 accommodating cavity.
In some embodiments, as shown in fig. 11a, one end of the plurality of first flow channels 4 far away from the second temperature equalizing plate 6 is provided to be communicated, and a plurality of auxiliary heat exchange flow channels 4-2 are additionally arranged to increase the space utilization rate; one end of the auxiliary heat exchange flow channel 4-2 far away from the second temperature equalizing plate 6 is communicated with the adjacent accommodating cavity, as shown by an inflection point I in fig. 11b, the space utilization rate can be further improved by the design, and rapid liquid injection is facilitated; the setting holds the one end height that the chamber is close to second samming board 6 and is greater than the one end height of keeping away from second samming board 6, as shown in fig. 11b, I inflection point height is less than III inflection point height, II inflection point height is less than IV inflection point height, can make the phase change material after the gasification more tend to flow to second runner 7 through III inflection point and IV inflection point like this, reduce the phase change material tolerance through I inflection point and II inflection point flow to second runner 7, because phase change material is longer from I inflection point and II inflection point flow to the route that second runner 7 passed through, design can reduce the flow like this, further improve samming radiating effect.
As shown in fig. 11b, the second flow channel 7 comprises three filling ports 7-1, and when the first flow channel 4 is filled, three filling lines are included, and the first line is formed by moving the phase change material from the A3 accommodating area to the A3 accommodating cavity; after the A3 accommodating cavity is filled, the phase change material moves from the A3 accommodating cavity to a D3 area; after the D3 area is filled, the phase change material moves from the D3 area to the C3 accommodating cavity; after the C3 accommodating cavity is filled, one part of the phase change material moves from the D3 area to the B3 accommodating cavity, and the other part of the phase change material moves from the A3 accommodating cavity to the G3 area; the second strip is the phase change material moving from the d3 accommodation region to the E3 region; the third is the movement of the phase change material from the e3 region to the F3 region.
When the temperature in the middle of the battery module 1 is too high and the phase change material is gasified, as shown in fig. 11c, the phase change material in the D3 region moves to the a3 accommodating region; the phase change material of the G3 region moves to the a3 accommodating region; one part of the phase change material of the C3 accommodating cavity moves to the C3 accommodating area, and the other part moves to the a3 accommodating area; part of the phase change material in the accommodating cavity B3 moves to the accommodating area B3, and the other part moves to the accommodating area a 3; a3, accommodating the phase change material of the cavity to an A3 accommodating area; the phase change material of the E3 area moves to the d3 containing area; the phase change material of the F3 region moves to the e3 region.
When the second flow channel 7 exchanges heat to the outside and the phase change material is liquefied, as shown in fig. 11d, the phase change material in the e3 region moves to the F3 region; d3 phase change material of the accommodation region moves to the E3 region; the phase change material in the A3 accommodating area preferentially moves to the A3 accommodating cavity; after the A3 accommodating cavity is filled, transferring to a D3 area and a G3 area; the phase change material in the accommodating area B3 moves to the accommodating cavity B3, and after the accommodating cavity B3 is filled, the phase change material is transferred to the area D3 through the inflection point I; and the phase change material in the C3 accommodating area moves to the C3 accommodating cavity, the C3 accommodating cavity is fully filled and then is transferred to the D3 area through the I inflection point, and the phase change material in the whole first temperature equalizing plate 3 and the second temperature equalizing plate 6 belongs to a dynamic balance state in the battery pack circulation process.
In some embodiments, each cell 2 is connected with a busbar 1-1, and a bracket 1-2 connected with each busbar 1-1 is arranged in the middle of the battery module 1, so that the cell 2 can be controlled conveniently.
In a second aspect of the present application, there is provided a battery pack, as shown in fig. 12, comprising: a housing 8, wherein the battery module 1 according to any one of the embodiments is mounted in the housing 8.
As shown in fig. 12, the case 8 includes an upper case 8-2 and a lower case 8-1, the battery module 1 is mounted in the lower case 8-1, and abuts against opposite sidewalls of the lower case 8-1 along the stacking direction of the battery cells 2, the battery module 1 may be plural, and the bottom of the case 8 may be provided with a condensing plate for heat dissipation, without limitation.
The battery pack is simple in structure, convenient and quick to assemble, high in space utilization rate and long in service life.
In some embodiments, as shown in fig. 12 to 14, a second temperature equalizing plate 6 is disposed on a side surface of the battery module 1 along the width direction, a heat conducting layer 9 is disposed between the second temperature equalizing plate 6 and a side wall of the housing 8, heat dissipating fins 10 are disposed on the outside of the corresponding side wall of the housing 8, and the side surface of the second temperature equalizing plate 6 is disposed obliquely downward toward the heat conducting layer 9, so that the second temperature equalizing plate 6 presses the heat conducting layer 9 and further presses the side wall of the housing 8; the heat dissipation fin 10 is externally provided with a baffle plate 11, the length of the baffle plate 11 is longer than that of the heat dissipation fin 10, and the middle part of the baffle plate 11 is provided with an exhaust hole 11-1.
The heat conducting layer 9 is, for example, a heat conducting structural adhesive, and is used for connecting the second temperature equalizing plate 6 and the lower shell 8-1, so that heat of the second temperature equalizing plate 6 can be transferred to the shell 8, the outer wall of the shell 8 is provided with a heat radiating fin 10, and the heat is exchanged with the outside, so that the battery module 1 dissipates heat, the whole heat dissipation path of the battery pack is the heat radiating fin 10 of the battery core 2-first temperature equalizing plate 3-second temperature equalizing plate 6-lower shell 8-1, and the phase change material in the second flow channel 7 after heat dissipation can be released and liquefied, and then flows back to the middle part of the first flow channel 4 to continue absorbing heat, so as to form dynamic balance.
As shown in fig. 13 and 14, the side of the second temperature-equalizing plate 6 is disposed obliquely downward toward the heat conductive layer 9, so that the heat conductive layer 9 can be pressed downward when the battery module 1 is mounted in the lower case 8-1, so that the lower case 8-1 and the second temperature-equalizing plate 6 can be closely matched to sufficiently perform heat exchange, thereby simplifying the process.
The inclination angle of the side surface of the second temperature equalizing plate 6 is, for example, 3 degrees to 8 degrees, so that the situation that the inclination angle is too small to achieve an extrusion effect and the situation that the inclination angle is too large to cause the battery module 1 to occupy a larger space is avoided.
As shown in fig. 15, the baffle 11 is arranged outside the heat dissipation fin 10, so that the heat exchange area can be further increased, and the heat dissipation effect can be improved; the battery pack is generally arranged towards the tail of a vehicle, air is in turbulent flow, the heat exchange effect is poor, the length of the baffle 11 is longer than that of the radiating fins 10, and the exhaust holes 11-1 are formed in the middle of the baffle 11, so that the air can be guided to enter the radiating fins 10 along two sides of the baffle 11, then flows out of the exhaust holes 11-1 in the middle of the baffle 11, heat is taken away, air circulation is accelerated, and the heat exchange effect is improved.
In some embodiments, as shown in fig. 13 and 14, the width of the heat dissipation fin 10 is smaller than the width of the sealing flange 8-3, so that the increase of the length of the battery pack is avoided, and the space utilization is improved; the height of the radiating fins 10 is smaller than that of the sealing flange 8-3, so that the influence on the disassembly of the shell 8 caused by the overhigh corresponding heat conducting layer 9 is avoided.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the application as described above, which are not provided in detail for the sake of brevity.
In addition, where details are set forth to describe example embodiments of the application, it will be apparent to one skilled in the art that embodiments of the application may be practiced without, or with variation of, these details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
Well-known power/ground connections to other components may or may not be shown in the drawings provided to simplify the illustration and discussion, and so as not to obscure embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are within the spirit and principles of the embodiments of the application, are intended to be included within the scope of the application.
Claims (13)
1. A battery module, comprising: the battery module comprises a plurality of battery cells which are sequentially connected, wherein a first temperature equalizing plate is arranged on the side surface of the battery cells along the length direction of the battery module, a first flow passage extending along the length direction is arranged in the first temperature equalizing plate and used for containing liquid-gas phase change materials, and the height of an area, close to at least one end of the battery module, of the first flow passage is larger than that of an area, close to the middle part of the battery module, of the first flow passage; the sectional area of the first flow channel close to the middle of the battery module is larger than that of the area of the first flow channel close to the end of the battery module.
2. The battery module according to claim 1, wherein a second temperature equalizing plate is arranged on a side surface of the battery module in the width direction, the second temperature equalizing plate is connected with the first temperature equalizing plate, a second flow passage extending in the width direction is arranged in the second temperature equalizing plate, the second flow passage is communicated with the corresponding first flow passage, and the height of the second flow passage is larger than that of the first flow passage.
3. The battery module of claim 2, wherein the second temperature equalization plate is disposed in a gap with the cell.
4. The battery module of claim 2, wherein the radial cross-sectional area of the second flow channel is greater than the radial cross-sectional area of the first flow channel near the end of the battery module.
5. The battery module according to claim 2, wherein a plurality of first flow channels are arranged in the first temperature equalizing plate, and the end parts of at least two first flow channels are communicated;
and/or a plurality of second flow passages are arranged in the second temperature equalizing plate, and at least two second flow passages are communicated.
6. The battery module according to claim 2, wherein the first flow passage includes a main heat exchange flow passage extending from one end of the first temperature equalizing plate to the other end thereof, and an auxiliary heat exchange flow passage provided in an area of the first temperature equalizing plate other than the main heat exchange flow passage.
7. The battery module of claim 6, wherein the length of the primary heat exchange flow channel is greater than the length of the secondary heat exchange flow channel.
8. The battery module according to claim 6, wherein one end of the first temperature-equalizing plate is connected with the second temperature-equalizing plate, the ends of the plurality of first flow passages located at one end of the first temperature-equalizing plate away from the second temperature-equalizing plate are communicated, and the height of the main heat exchange flow passage located at the top gradually increases along the direction from the first temperature-equalizing plate to the second temperature-equalizing plate.
9. The battery module according to claim 8, wherein a receiving cavity is formed at a middle portion of the main heat exchanging channel, and a height of one end of the receiving cavity, which is close to the second temperature equalizing plate, is greater than a height of one end, which is far away from the second temperature equalizing plate.
10. The battery module according to claim 9, wherein the main heat exchange flow passage comprises at least two branch flow passages which are arranged in a stacked manner and communicated, each branch flow passage is provided with the accommodating cavity, the communication position of the at least two branch flow passages is located at one side of the accommodating cavity away from the second temperature equalizing plate, and the height of one end of the accommodating cavity located below and close to the second temperature equalizing plate is larger than that of the communication position.
11. The battery module according to claim 10, wherein the communication portion is provided near an end of the accommodation chamber away from the second temperature equalizing plate.
12. A battery pack comprising a case in which the battery module according to any one of claims 1 to 11 is mounted.
13. The battery pack according to claim 12, wherein a second temperature equalizing plate is arranged on the side surface of the battery module in the width direction, a heat conducting layer is arranged between the second temperature equalizing plate and the side wall of the shell, heat radiating fins are arranged outside the corresponding side wall of the shell, and the side surface of the second temperature equalizing plate is obliquely downwards arranged towards the heat conducting layer so that the second temperature equalizing plate presses the heat conducting layer and further presses the side wall of the shell; the heat dissipation fin is characterized in that a baffle is arranged outside the heat dissipation fin, the length of the baffle is larger than that of the heat dissipation fin, and an exhaust hole is formed in the middle of the baffle.
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| CN116345011A (en) | 2023-06-27 |
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