Liquid cooling plate for battery module

Abstract

The invention provides a liquid cooling plate for a battery module. The liquid cooling plate can be arranged above a group of battery modules or can be arranged between two groups of battery modules which are arranged up and down. The liquid cooling plate is provided with a shell made of a heat insulation material and a heat dissipation contact part made of a heat conduction material, and an inner cavity for cooling fluid to flow through is formed in the liquid cooling plate. And the position of the first heat dissipation contact part on the lower surface of the liquid cooling plate corresponds to the position of each busbar in the adjacent battery module. In the length direction of the liquid cooling plate and / or the width direction of the liquid cooling plate, the area of the first heat dissipation contact part located in the middle is larger than that of the first heat dissipation contact parts located on the two sides. The shell made of the heat insulation material can ensure the temperature of the liquid cooling medium to the maximum extent and reduce the condensation phenomenon. And the liquid cooling plate not only can lead out the heat of the electrode columns and the busbars, but also can ensure the insulation between the electrode columns on different busbars, and can ensure the uniform heat dissipation of the whole battery module.

Description

Technical Field

[0001] The present invention relates to the field of lithium batteries, and particularly to a liquid cooling plate for a battery module. Background Art

[0002] Lithium-ion batteries are new high-energy batteries using lithium-inserted compounds as the positive and negative electrode materials. Compared with lead-acid batteries and nickel-metal hydride batteries, they have a series of advantages such as high specific energy, high voltage, low self-discharge, good cycle performance, and long service life, and are increasingly attracting people's attention and are widely used in the energy storage field. The charging and discharging current of energy storage batteries increases with the increase of battery capacity, and heat generation is obvious at the positions of battery electrode posts and busbars under large current. At present, battery modules tend to adopt liquid cooling design, but the design space of battery modules is becoming more and more compact, and the heat dissipation space left at the positions of electrode posts is insufficient. Moreover, the liquid cooling plate is generally arranged under the battery cells, which will further cause uneven temperature distribution at the bottom, top, and electrode post positions of the battery. In addition, the anti-condensation problem of the liquid cooling pipelines near the battery cells in the liquid cooling system is also a problem that needs to be solved. Summary of the Invention

[0003] In view of the above problems, the present invention provides a liquid cooling plate for a battery module, which can be placed above a group of battery modules or between two groups of battery modules arranged vertically. The liquid cooling plate is provided with a housing made of heat-insulating and insulating material and a heat dissipation contact part made of heat-conducting material, and an inner cavity for cooling fluid to flow through is formed inside the liquid cooling plate. The position of the first heat dissipation contact part on the lower surface of the liquid cooling plate corresponds to the positions of the respective busbars in the adjacent battery modules. In the length direction and / or width direction of the liquid cooling plate, the area of the first heat dissipation contact part at the middle position is larger than the area of the first heat dissipation contact part at the two side positions. The housing made of heat-insulating and insulating material can ensure the temperature of the liquid cooling medium to the greatest extent and reduce the condensation phenomenon. And this liquid cooling plate can not only conduct the heat of the electrode posts and busbars but also ensure the insulation between the electrode posts on different busbars, and can ensure uniform heat dissipation of the entire battery module.

[0004] The technical solution provided by the present invention is as follows:

[0005] According to the present invention, a liquid cooling plate for a battery module is provided. The battery module includes a plurality of battery cells arranged in a rectangular matrix form, and the electrode posts of the plurality of battery cells are connected in series and parallel via busbars. The liquid cooling plate is placed above the battery module, and the length of the liquid cooling plate is greater than or equal to the length of the battery module, and the width of the liquid cooling plate is greater than or equal to the width of the battery module. The liquid cooling plate includes a housing, a first heat dissipation contact portion, an injection flow channel, and a discharge flow channel. An inner cavity is provided in the housing, and the cooling fluid enters the inner cavity via the injection flow channel and flows out via the discharge flow channel. A plurality of through holes are provided on the lower surface of the housing, and a plurality of first heat dissipation contact portions are respectively sealed and connected to the plurality of through holes. The positions of the plurality of first heat dissipation contact portions correspond to the positions of the respective busbars of the battery module or the positions of the electrode posts of the battery cells of the battery module, and the first heat dissipation contact portion is in heat conduction contact with the busbar. The first heat dissipation contact portion is made of a heat-conducting material, and the housing is made of a heat-insulating and insulating material. Specifically, each group of battery modules may include a plurality of battery cells arranged in a rectangular matrix. An electrode post is provided on the top of each battery cell, and the electrode posts of the battery cells are connected in series and parallel through busbars to form an overall battery module. The liquid cooling plate can be placed above the battery module and contact the busbars located on the tops of the battery cells of the battery module. When there are multiple stacked groups of battery modules, a liquid cooling plate can be provided between the two groups of battery modules on the upper and lower layers, such that the lower surface of the liquid cooling plate contacts the busbars on the tops of the battery cells of the lower-layer battery module and the upper surface of the liquid cooling plate contacts the bottom surfaces of the battery cells of the upper-layer battery module. The outer shell of the liquid cooling plate is made of a heat-insulating and insulating material, and an inner cavity is formed inside the outer shell. The injection flow channel and the discharge flow channel can be connected to the outer shell or integrally formed. Through holes are provided at positions on the outer shell corresponding to the busbars of the battery module, and the first heat dissipation contact portions are hermetically embedded in the through holes; alternatively, since the temperature is the highest at the positions on the busbars corresponding to the electrode posts, through holes can also be provided at positions on the outer shell corresponding to the electrode posts of the battery module, and the first heat dissipation contact portions are hermetically embedded in the through holes. The first heat dissipation contact portion can quickly conduct out the heat of the busbar in contact with it and at the same time quickly conduct out the heat of the electrode post connected to the busbar. The size of the first heat dissipation contact portion can be greater than or equal to the size of the busbar in contact with it or greater than or equal to the size of the top surface of the electrode post, that is, the area of the first heat dissipation contact portion can be greater than or equal to the area of the busbar in contact with it or can be greater than or equal to the top surface area of the electrode post. Since the material of the outer shell has insulation properties, while ensuring heat dissipation of the busbars and electrode posts in the first heat dissipation contact portion of the liquid cooling plate, insulation between the electrode posts of different busbars can also be ensured, ensuring the safety of the battery module. Since the material of the outer shell has heat insulation properties, the cooling fluid in the inner cavity of the outer shell can be reduced in contact with the external air, and the low-temperature state of the cooling fluid can be maintained to the greatest extent, so that the cooling fluid can better exert its cooling effect; at the same time, the heat-insulating outer shell can effectively avoid the condensation phenomenon of the liquid cooling plate.

[0006] Along the length direction of the liquid cooling plate, the area of the first heat dissipation contact part located at the middle position of the liquid cooling plate is larger than that of the first heat dissipation contact part located at both sides of the liquid cooling plate. That is to say, along the length direction of the liquid cooling plate, the area of the first heat dissipation contact part increases gradually from both ends of the liquid cooling plate towards the middle. The first heat dissipation contact part with a larger area can contact more with the cooling fluid in the inner cavity, so as to dissipate heat and cool down more quickly. Similarly, along the width direction of the liquid cooling plate, the area of the first heat dissipation contact part located at the middle position of the liquid cooling plate can also be larger than that of the first heat dissipation contact part located at both sides of the liquid cooling plate. This can solve the problem of difficult heat dissipation of the battery cells in the middle of the battery module, enable the battery cells in the middle of the battery module to dissipate heat more quickly, and further ensure that the battery cells located on the outer side and in the middle of the entire battery module can dissipate heat evenly, ensure the safety of the entire battery module, and extend the service life of the battery module.

[0007] The first heat dissipation contact part can be in a planar or flat plate shape, and the planar first heat dissipation contact part can abut against the bus bar of the battery module. Preferably, the first heat dissipation contact part can be recessed into the inner cavity, and the recessed first heat dissipation contact part can be sleeved on the bus bar of the battery module. That is to say, in addition to the planar shape, the first heat dissipation contact part can also be set in a recessed cylindrical or bowl shape, and the edge of the cylindrical or bowl-shaped first heat dissipation contact part is hermetically connected to the through hole of the housing. The cross-sectional area or bottom area of the cylindrical or bowl-shaped first heat dissipation contact part is greater than or equal to the area of the bus bar in contact with it. The recessed first heat dissipation contact part can be more easily and accurately positioned with the bus bar of the battery module, and the recessed first heat dissipation contact part and the protruding bus bar can be more stably fixedly connected. In addition, the recessed first heat dissipation contact part has a larger contact area with the cooling fluid, so that the first heat dissipation contact part can dissipate heat and cool down more quickly.

[0008] A cable groove can also be provided on the housing, and the connecting cables of the battery module can be accommodated in the cable groove. Since there are many connecting cables of the battery module, scattered beside the battery module will cause potential safety hazards. Therefore, placing the connecting cables of the battery module in the cable groove of the liquid cooling plate housing can keep the integrated system of the battery module and the liquid cooling plate clean and avoid potential safety hazards caused by the disorderly placement of the connecting cables.

[0009] In addition, a relatively large opening may be provided on the upper surface of the liquid cooling plate housing. The liquid cooling plate further includes a second heat dissipation contact portion, and the edge of the second heat dissipation contact portion is hermetically connected to the opening. The size of the second heat dissipation contact portion is greater than or equal to the size of the bottom surface of the battery module. This situation is particularly applicable to the case of stacked multiple groups of battery modules. When the liquid cooling plate is placed between two layers of battery modules, the liquid cooling plate can simultaneously cool the busbars and electrode posts of the lower-layer battery module and the bottom of the upper-layer battery module. The opening on the upper surface of the liquid cooling plate housing and the size of the second heat dissipation contact portion embedded therein generally correspond to the size of the bottom surface of the battery module. The second heat dissipation contact portion is also made of a heat-conducting material.

[0010] The inner cavity in the liquid cooling plate housing can be in a completely hollow form, or an inner cavity flow channel can be formed in the housing. The inner cavity flow channel can be integrally formed with the housing or separately provided. For example, the thickness of the upper cover of the housing is approximately equal to the height of the inner cavity, and a groove serving as the inner cavity flow channel is provided on the upper cover of the housing, and the bottom surface of the upper cover abuts against the upper surface of the inner cavity bottom plate of the housing. Or, a separate vertical baffle can be provided in the inner cavity of the housing or a vertical baffle can be integrally formed on the upper cover, and the inner cavity flow channel is enclosed between the bottom surface of the upper cover and the upper surface of the inner cavity bottom plate by the baffle. Or, a separate groove plate can be provided in the inner cavity of the housing, the thickness of the groove plate is approximately equal to the height of the inner cavity, the inner cavity flow channel is provided on the groove plate, the top surface of the groove plate is connected to the bottom surface of the upper cover, and the bottom surface of the groove plate is connected to the upper surface of the inner cavity bottom plate. When the inner cavity flow channel is integrally formed in the housing, the cooling fluid flow channel can be formed in a simple manner without additional processing of fluid pipes. The inner cavity flow channel can be arranged along the length direction of the liquid cooling plate, so that the inner cavity part of the inner cavity flow channel located above each row of the first heat dissipation contact portions can enable the cooling fluid flowing in the inner cavity flow channel to take away the heat of the first heat dissipation contact portion more quickly. The inner cavity flow channel can be designed in the form of a wavy bent flow channel. In the width direction of the liquid cooling plate, the density of the bent flow channels in the middle of the liquid cooling plate is greater than that of the bent flow channels on both sides of the liquid cooling plate, or the bending amplitude of the bent flow channels in the middle of the liquid cooling plate is greater than that of the bent flow channels on both sides of the liquid cooling plate. That is to say, the flow channel length of the inner cavity flow channel in the middle of the liquid cooling plate is greater than the length of the inner cavity flow channels on both sides of the liquid cooling plate. The inner cavity flow channel can also be designed as a flow channel with different flow channel widths. In the length direction of the liquid cooling plate, the width of the straight flow channel at the position corresponding to the busbar position is greater than the width of the straight flow channel at the position not corresponding to the busbar position. The inner cavity flow channel according to the present invention can be more beneficial to the heat dissipation of the electrode posts, busbars, and bottoms of battery cells in the middle of the battery module.

[0011] The material of the housing of the liquid cooling plate can be a high-temperature resistant polymer material, such as polypropylene, ABS plastic (a polymer material made from three monomers, propylene, styrene, and butadiene through a polymerization reaction), polyphenylene ether, polyimide, polyphenylene sulfide, polyaramide, polyether ketone, polyether ether ketone, fluororesin, or a combination of several of them. The high-temperature resistant polymer material is beneficial for integrally forming complex structures and has the function of high-temperature resistance and flame retardancy, which can improve the safety of the system.

[0012] The materials of the first heat dissipation contact part and the second heat dissipation contact part are heat-conducting materials, which can be aluminum, copper, aluminum alloy, copper alloy, or heat-conducting carbon material. The cooling fluid can be an insulating medium such as silicone oil, insulating oil, or ethylene glycol.

[0013] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as a limitation on the protection scope of the present invention.

[0014] The advantages of the present invention are as follows:

[0015] 1) Strengthen the heat dissipation of the battery cells located in the middle of the battery module, thereby ensuring uniform heat dissipation of the entire battery module. Compared with a liquid cooling plate made entirely of heat-conducting metal materials, the liquid cooling plate of the present invention can not only conduct the heat of the bus bar and the electrode post, but also ensure insulation between the electrode posts on different bus bars;

[0016] 2) The housing of the liquid cooling plate uses a heat-insulating and insulating material such as a polymer, which can be processed by various methods such as injection molding, reducing the material cost and processing cost. The heat-insulating housing can ensure the temperature of the liquid cooling medium in the inner cavity to the greatest extent and can reduce the condensation phenomenon on the surface of the housing;

[0017] 3) The inner cavity flow channels integrally formed in the inner cavity of the housing can facilitate the diversification and personalization of the flow channel design and layout, with convenient molding and low cost, and no additional processing procedures are required;

[0018] 4) The heat dissipation contact part adopts a recessed design, making it easier for the bus bar to align and dock smoothly with the heat dissipation contact part, with faster heat dissipation speed. The recessed cable groove can make the cable layout of the battery module safer and more orderly. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of a multi-layer battery module and a liquid cooling plate;

[0020] Figure 2 It is a positional relationship diagram of a single-layer battery module and a liquid cooling plate;

[0021] Figure 3 It is a schematic diagram of the liquid cooling plate according to the first embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the liquid cooling plate according to the second embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the liquid cooling plate according to the third embodiment of the present invention;

[0024] Figures 6(a), 6(b), and 6(c) are schematic diagrams of different embodiments of the internal cavity flow channel of the liquid cooling plate.

[0025] List of reference numerals

[0026] 1 - Battery module

[0027] 101 - Bus bar

[0028] 2 - Liquid cooling plate

[0029] 201 - Housing

[0030] 202 - First heat dissipation contact part

[0031] 203 - Injection flow channel

[0032] 204 - Discharge flow channel

[0033] 205 - Cable groove

[0034] 206 - Second heat dissipation contact part

[0035] 207 - Internal cavity flow channel

[0036] 208 - Turbulence part Detailed implementation manners

[0037] The present invention will be further described below in conjunction with the accompanying drawings through examples.

[0038] Figure 1 It is an overall schematic diagram of a multi-layer battery module and a liquid cooling plate. In Figure 1 a three-layer battery module 1 is shown. Each layer of the battery module 1 includes a plurality of battery cells, and the plurality of battery cells are arranged in a rectangular matrix, and the plurality of battery cells are connected in series and parallel using a plurality of bus bars. A liquid cooling plate 2 is provided between every two layers of the battery modules 1. The liquid cooling plate 2 can simultaneously cool the bus bars and electrode columns of the lower-layer battery module and the bottom surface of the battery cells of the upper-layer battery module.

[0039] Figure 2It is a position relationship diagram of a single-layer battery module and a liquid cooling plate. In the figure, the length direction of the battery module and the length direction of the liquid cooling plate are called the X direction, and the width direction of the battery module and the width direction of the liquid cooling plate are called the Y direction. The electrode posts and busbars 101 of the battery cells are located on the upper surface of the battery module. The lower surface or the first surface of the liquid cooling plate faces the upper surface of the battery module. When the liquid cooling plate is placed on the battery module, the first heat dissipation contact part 202 located on the lower surface or the first surface of the liquid cooling plate is in thermal contact with the busbar 101 of the battery module. The upper surface or the second surface of the liquid cooling plate can also dissipate heat from another set of battery modules located above it. In Figure 2 it shows an exploded schematic view of the liquid cooling plate. The liquid cooling plate may include a housing 201, a first heat dissipation contact part 202, an injection channel 203, and a discharge channel 204. Among them, the housing 201 can be divided into an upper cover and a lower housing or the housing 201 can be integrally formed, with an inner cavity formed inside the housing and through holes formed on the lower surface of the housing. The first heat dissipation contact part 202 can be sealed and installed in the through holes on the lower surface or the first surface of the housing. In addition, a second heat dissipation contact part can also be provided on the upper surface or the second surface of the housing. The injection channel 203 and the discharge channel 204 are located on the housing and are in fluid communication with the inner cavity of the housing.

[0040] Figure 3 It is a schematic diagram of the liquid cooling plate according to the first embodiment of the present invention. For clarity, Figure 3 the lower surface or the first surface of the liquid cooling plate in it is placed facing upwards. The liquid cooling plate includes a housing 201, a first heat dissipation contact part 202, an injection channel 203, and a discharge channel 204. The materials of the injection channel 203, the discharge channel 204, and the housing 201 are polypropylene, and the injection channel 203 and the discharge channel 204 are connected to the housing 201 in a melt-bonded manner. A plurality of through holes are formed on the housing 201, and the first heat dissipation contact part 202 is hermetically inlaid in the through holes. The first heat dissipation contact part 202 is in a planar shape, and its material can be aluminum alloy. The position of the first heat dissipation contact part 202 corresponds to the position of the busbar of the battery module. When the liquid cooling plate is adjacent to the battery module, the first heat dissipation contact part 202 located on the lower surface of the liquid cooling plate abuts against the busbar at the top of the battery module. The area of the first heat dissipation contact part 202 can be greater than or equal to the area of the busbar with which it is in contact.

[0041] The cooling fluid enters the inner cavity of the housing 201 through the injection channel 203 and is discharged through the discharge channel 204. The cooling fluid contained in the inner cavity can reduce the heat exchange with the surrounding air under the action of the heat insulation housing, which can not only better maintain the low temperature of the cooling fluid, but also well avoid the condensation phenomenon of the liquid cooling plate. At the position of the first heat dissipation contact part 202 with good thermal conductivity, the heat of the electrode posts and busbars of the battery module is taken away by the low-temperature cooling fluid, so that the effective heat dissipation of the electrode posts and busbars of the battery module can be realized through the first heat dissipation contact part 202. The insulating housing 201 separates the electrically conductive first heat dissipation contact parts 202 from each other, so that while ensuring the heat dissipation of the busbars and electrode posts of the battery module, the insulation between the electrode posts on different busbars of the battery module can also be ensured, effectively improving the safety of the battery module.

[0042] In the length direction X of the liquid cooling plate, the area of the first heat dissipation contact part 202 gradually decreases from the middle position of the liquid cooling plate towards both sides. The larger the area of the first heat dissipation contact part 202, the larger the contact area with the cooling fluid in the inner cavity, the faster the temperature drops, and the heat dissipation of the busbar in contact with it can be carried out more quickly. Since the battery cells in the middle of the battery module have difficulty in dissipating heat and have the highest temperature, the liquid cooling plate according to the present invention can better dissipate heat from the battery cells in the middle of the battery module. The busbars of the battery cells with higher temperature in the middle of the battery module are in contact with the first heat dissipation contact part 202 with a larger area, and the busbars of the battery cells with lower temperature at the edge of the battery module are in contact with the first heat dissipation contact part 202 with a smaller area, so that the entire battery module can be evenly cooled.

[0043] Figure 4 It is a schematic diagram of a liquid cooling plate according to the second embodiment of the present invention. For clarity, Figure 4The lower surface or the first surface of the liquid cooling plate is placed upward. The liquid cooling plate includes a housing 201, a first heat dissipation contact portion 202, an injection flow channel 203, and a discharge flow channel 204. The materials of the injection flow channel 203, the discharge flow channel 204, and the housing 201 are ABS, and the injection flow channel 203 and the discharge flow channel 204 are integrally formed with the housing 201. A plurality of through holes are formed in the housing 201, and the first heat dissipation contact portion 202 is hermetically embedded in the through holes. The first heat dissipation contact portion 202 is in a cylindrical shape, and its material can be a copper alloy. When the cylindrical first heat dissipation contact portion 202 is hermetically installed in the through holes, the first heat dissipation contact portion 202 is recessed toward the inner cavity of the housing 201. The position of the first heat dissipation contact portion 202 corresponds to the position of the bus bar of the battery module. When the liquid cooling plate is adjacent to the battery module, the recessed first heat dissipation contact portion 202 on the lower surface of the liquid cooling plate is sleeved with the protruding bus bar on the top of the battery module, so that the first heat dissipation contact portion 202 and the bus bar can be more easily and accurately positioned. In the length direction X of the liquid cooling plate, the cross-sectional area of the first heat dissipation contact portion 202 gradually decreases from the middle position of the liquid cooling plate toward both sides.

[0044] A cable groove 205 is provided on the housing 201 of the liquid cooling plate. The connection cables of the battery module can be flatly accommodated in the cable groove 205, avoiding potential safety hazards caused by disorderly placement of the cables.

[0045] Figure 5 It is a schematic diagram of the liquid cooling plate according to the third embodiment of the present invention. In this embodiment, the upper surface or the second surface of the liquid cooling plate is shown. Different from the first embodiment and the second embodiment, in this embodiment, the liquid cooling plate further includes a second heat dissipation contact portion 206 located on its upper surface. A relatively large opening is provided on the upper surface of the housing 201, and the size of the opening is substantially the same as the bottom surface size of the battery module. The edge of the second heat dissipation contact portion 206 is hermetically connected to the opening. The material of the second heat dissipation contact portion 206 can be a thermally conductive carbon material. The liquid cooling plate of this embodiment is particularly suitable for being placed between two sets of upper and lower battery modules, and can simultaneously dissipate heat from the bottom of the upper set of battery modules and the top electrode posts and bus bars of the lower set of battery modules.

[0046] FIG. 6(a), FIG. 6(b), and FIG. 6(c) are schematic diagrams of different embodiments of the internal cavity flow channels of the liquid cooling plate. Along the position of the first heat dissipation contact part of each column, corresponding internal cavity flow channels are arranged in the internal cavity. The internal cavity flow channels are preferably integrally formed with the housing. As shown in FIG. 6(a), the internal cavity flow channel 207 is a wavy bent flow channel, and the bending density of the bent flow channel is different. Along the width direction Y of the liquid cooling plate, the bent flow channels located in the middle part of the liquid cooling plate are arranged more closely, that is, the arrangement density of the bent flow channels is greater, while the bent flow channels located on both sides of the liquid cooling plate are arranged more sparsely, that is, the arrangement density of the bent flow channels is smaller. As shown in FIG. 6(b), the internal cavity flow channel 207 is a wavy bent flow channel, and the bending amplitude of the bent flow channel is different. Along the width direction Y of the liquid cooling plate, the bending amplitude of the bent flow channels located in the middle part of the liquid cooling plate is larger, that is, the amplitude of the bent flow channels is greater, while the bending amplitude of the bent flow channels located on both sides of the liquid cooling plate is smaller or there is no bending, that is, the amplitude of the bent flow channels is smaller or it is a straight flow channel. In the embodiments shown in FIG. 6(a) and FIG. 6(b), the flow channel widths of the bent flow channels are the same, only the bending degrees of the bent flow channels are different. As shown in FIG. 6(c), the internal cavity flow channel 207 is a flow channel with different flow channel widths. Along the length direction of the liquid cooling plate, the flow channel width D of the straight flow channel located at the bus bar position (i.e., the position corresponding to the bus bar position) is larger, while the flow channel width d of the straight flow channel located at the non-bus bar position (i.e., the position not corresponding to the bus bar position) is smaller. A flow disturbance part 208 can be provided in the flow channel part with a larger width, so that the fluid in the flow channel part with a larger width can increase the disturbance. Through the design of the internal cavity flow channels of the above different embodiments, the cooling speed in the middle part of the liquid cooling plate can be accelerated, and thus it is beneficial to the rapid heat dissipation in the middle part of the battery module. The combination of the internal cavity flow channels and the first heat dissipation contact part on the lower surface of the liquid cooling plate can more significantly improve the temperature reduction effect in the middle part of the liquid cooling plate. Even on the upper surface of the liquid cooling plate provided with the second heat dissipation contact part, the rapid heat dissipation in the middle part of the upper battery module can be preferably achieved.

[0047] The specific embodiments of the present invention are not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A liquid cooling plate for a battery module, the battery module comprising a plurality of battery cells arranged in a rectangular matrix form, and electrode posts of the plurality of battery cells being connected in series and parallel via busbars, characterized in that, The liquid cooling plate is placed above the battery module. The length of the liquid cooling plate is greater than or equal to the length of the battery module, and the width of the liquid cooling plate is greater than or equal to the width of the battery module. The liquid cooling plate includes a housing, a first heat dissipation contact portion, an injection channel, and a discharge channel. An inner cavity is provided in the housing. The cooling fluid enters the inner cavity through the injection channel and flows out through the discharge channel. A plurality of through holes are provided on the lower surface of the housing, and the plurality of first heat dissipation contact portions are respectively sealed and connected to the plurality of through holes. The plurality of first heat dissipation contact portions correspond to the positions of the respective busbars of the battery module or the plurality of first heat dissipation contact portions correspond to the positions of the electrode posts of the battery cells of the battery module. And the first heat dissipation contact portion is in heat conduction contact with the busbar. The first heat dissipation contact portion is made of a heat conductive material, and the housing is made of a heat insulating and insulating material.

2. The liquid cooling plate for a battery module according to claim 1, wherein, Along the length direction of the liquid cooling plate, the area of the first heat dissipation contact portion located at the middle position of the liquid cooling plate is larger than the area of the first heat dissipation contact portion located at the two side positions of the liquid cooling plate.

3. The liquid cooling plate for a battery module according to claim 1 or 2, wherein, Along the width direction of the liquid cooling plate, the area of the first heat dissipation contact portion located at the middle position of the liquid cooling plate is larger than the area of the first heat dissipation contact portion located at the two side positions of the liquid cooling plate.

4. The liquid cooling plate for a battery module according to claim 1, wherein, The first heat dissipation contact portion is in a planar shape, and the planar first heat dissipation contact portion can abut against the busbar of the battery module; or, the first heat dissipation contact portion is recessed into the inner cavity, and the recessed first heat dissipation contact portion can be sleeved on the busbar of the battery module.

5. The liquid cooling plate for a battery module according to claim 1, wherein, A cable groove is provided on the housing, and the connection cable of the battery module can be accommodated in the cable groove.

6. The liquid cooling plate for a battery module according to claim 1, wherein, An opening is provided on the upper surface of the housing. The liquid cooling plate further includes a second heat dissipation contact portion. The edge of the second heat dissipation contact portion is sealed and connected to the opening. The size of the second heat dissipation contact portion corresponds to the size of the bottom surface of the battery module.

7. The liquid cooling plate for a battery module according to claim 1, wherein, An inner cavity flow channel is provided in the inner cavity. The inner cavity flow channel is in the form of a wavy bent flow channel. In the width direction of the liquid cooling plate, the density of the bent flow channels located in the middle of the liquid cooling plate is greater than the density of the bent flow channels located on both sides of the liquid cooling plate, or the bending amplitude of the bent flow channels located in the middle of the liquid cooling plate is greater than the bending amplitude of the bent flow channels located on both sides of the liquid cooling plate.

8. The liquid cooling plate for a battery module according to claim 1, wherein, An inner cavity flow channel is provided in the inner cavity. The inner cavity flow channel is a flow channel with different flow widths. In the length direction of the liquid cooling plate, the width of the straight flow channel at the position corresponding to the busbar position is greater than the width of the straight flow channel at the position not corresponding to the busbar position.

9. The liquid cooling plate for a battery module according to claim 1, wherein, The material of the housing is a high-temperature resistant polymer material, and the high-temperature resistant polymer material is one or more of polypropylene, ABS plastic, polyphenylene ether, polyimide, polyphenylene sulfide, polyaramide, polyether ketone, polyether ether ketone, fluororesin.

10. The liquid cooling plate for a battery module according to claim 6, wherein, The materials of the first heat dissipation contact portion and the second heat dissipation contact portion are heat conductive materials, and the heat conductive materials are aluminum, copper, aluminum alloy, copper alloy or heat conductive carbon materials.

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