Liquid cooling plate, cooling system and battery pack

Abstract

The utility model provides a liquid cooling plate, a cooling system and a battery pack, the liquid cooling plate is applied to the battery pack, the battery pack comprises a battery module, the liquid cooling plate comprises a liquid cooling plate body, the liquid cooling plate body is configured to be thermally coupled with the battery module, the liquid cooling plate body is internally provided with a cooling liquid flow channel, and the cooling liquid flow channel is communicated with the battery module. The liquid cooling plate body is also provided with a first air hole communicated with the cooling liquid flow channel; and the first waterproof breathable film is arranged on the liquid cooling plate body and covers the first breathable holes. The liquid cooling plate body is provided with the first air hole communicated with the cooling liquid flow channel in the liquid cooling plate body, and the first waterproof air-permeable membrane is arranged on the liquid cooling plate body, so that the first air hole is covered by the first waterproof air-permeable membrane, and when the cooling liquid in the cooling liquid flow channel cools the battery module, the cooling liquid is heated and gasified, and the cooling liquid is cooled by the first waterproof air-permeable membrane. And the air can enter the battery module through the first air hole and the first waterproof air-permeable membrane, so that the battery module is further cooled.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a liquid cooling plate, cooling system and battery pack. BACKGROUND

[0002] The electric core is the main energy storage basic unit of the electrochemical energy storage system. In order to realize the storage and release of larger capacity electric energy, usually multiple electric core units are connected in series or parallel to form a module, and then form a battery pack.

[0003] At present, the solutions for the large amount of heat generated by the battery pack during long-time charging and discharging or large-ratio electric core operation on the market include air cooling and liquid cooling. Liquid cooling has better heat dissipation effect than air cooling. However, liquid cooling still has the problems of insufficient heat dissipation and uneven distribution of electric core temperature. SUMMARY

[0004] The embodiments of the utility model provide a liquid cooling plate, a cooling system and a battery pack, which can improve the technical problem of insufficient heat dissipation of the battery pack.

[0005] In a first aspect, the embodiments of the utility model provide a liquid cooling plate applied to a battery pack, wherein the battery pack comprises a battery module, and the liquid cooling plate comprises:

[0006] A liquid cooling plate body is configured to be thermally coupled with the battery module, a cooling liquid flow channel is arranged inside the liquid cooling plate body, and a first air-permeable hole communicating with the cooling liquid flow channel is further arranged on the liquid cooling plate body.

[0007] A first waterproof air-permeable film is arranged on the liquid cooling plate body and covers the first air-permeable hole.

[0008] In an embodiment, the liquid cooling plate body has a heat exchange region, the heat exchange region is configured to be thermally coupled with the battery module, and the first air-permeable hole is distributed in the heat exchange region.

[0009] In an embodiment, the liquid cooling plate body further has a connecting region arranged adjacent to the heat exchange region, the cooling liquid flow channel comprises an inlet and an outlet located in the connecting region, and the liquid cooling plate further comprises an inlet pipe connected with the inlet and an outlet pipe connected with the outlet.

[0010] In an embodiment, the first waterproof air-permeable film is bonded with the liquid cooling plate body.

[0011] In an embodiment, a sealing structure is arranged between the periphery of the first waterproof air-permeable film and the liquid cooling plate body.

[0012] In a second aspect, the embodiments of the utility model provide a cooling system comprising the above liquid cooling plate.

[0013] In an embodiment, a cooling liquid container is arranged on a side of the battery module away from the liquid cooling plate, and a condenser is arranged on a side of the cooling liquid container away from the battery module.

[0014] In an embodiment, a cooling liquid collection cavity is arranged in the cooling liquid container, a second air-permeable hole is arranged on the cooling liquid container and communicates with the cooling liquid collection cavity, the second air-permeable hole penetrates a cavity wall of the cooling liquid collection cavity, and a second waterproof air-permeable film is arranged in the cooling liquid collection cavity and covers the second air-permeable hole.

[0015] In an embodiment, a plurality of cooling liquid collection cavities are arranged at intervals, and reinforcing ribs are arranged between the plurality of cooling liquid collection cavities.

[0016] In an embodiment, a spray opening is further arranged on the cooling liquid container, the spray opening communicates with the cooling liquid collection cavity and is arranged towards the battery module.

[0017] In an embodiment, an acoustic wave sensor is further included, the spray opening is provided with an electromagnetic valve, and the acoustic wave sensor is in communication connection with the electromagnetic valve.

[0018] In a third aspect, an embodiment of the utility model provides a battery pack comprising the cooling system.

[0019] In an embodiment, the battery pack further comprises a box body, the battery module is arranged in the box body, the box body has an opening, the box body is fixedly connected with the liquid cooling plate body and seals the opening, and the cooling liquid container and the condenser of the cooling system are fixedly connected with the box body.

[0020] In an embodiment, a cooling liquid outlet is arranged on the box body and communicates with the cooling liquid collection cavity.

[0021] The embodiment of the utility model has the beneficial effects that:

[0022] In the embodiment of the utility model, the first air-permeable hole communicating with the cooling liquid flow channel inside the liquid cooling plate body is arranged on the liquid cooling plate body, the first waterproof air-permeable film is arranged on the liquid cooling plate body, the first waterproof air-permeable film covers the first air-permeable hole, and when the cooling liquid in the cooling liquid flow channel cools the battery module, the heated and vaporized cooling liquid can enter the battery module through the first air-permeable hole and the first waterproof air-permeable film, so that the battery module is further cooled. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the liquid cooling plate provided in an embodiment of this utility model;

[0025] Figure 2 This is an exploded view of the battery pack provided in an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the box provided in an embodiment of the present invention (the coolant collection container and the condenser are integrated on the top of the box);

[0027] Figure 4 This is a schematic diagram of the structure of the coolant collection container provided in an embodiment of this utility model.

[0028] Reference numerals: Liquid cooling plate-1; Liquid cooling plate body-11; Connection area-111; Inlet pipe-1111; Outlet pipe-1112; First waterproof and breathable membrane-12; Coolant collection container-2; Coolant collection chamber-21; Second vent-22; Second waterproof and breathable membrane-23; Reinforcing rib-24; Spray nozzle-25; Condenser-3; Battery module-4; Housing-5; Opening-51. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0030] Firstly, please refer to Figure 1 and Figure 2 An embodiment of this utility model provides a liquid cooling plate 1, applied to a battery pack, the battery pack including a battery module 4, the liquid cooling plate 1 comprising:

[0031] The liquid cooling plate body 11 is configured to be thermally coupled with the battery module 4, and a cooling liquid flow channel is arranged inside the liquid cooling plate body 11. A first air-permeable hole is arranged on the liquid cooling plate body 11 and communicates with the cooling liquid flow channel.

[0032] The first waterproof air-permeable film 12 is arranged on the liquid cooling plate body 11 and covers the first air-permeable hole.

[0033] It can be understood that the cooling liquid in the liquid cooling plate body 11 can be vaporized into a gaseous state after absorbing the heat generated by the battery module 4. The vaporized cooling liquid can enter the battery module 4 through the first air-permeable hole and the first waterproof air-permeable film 12, thereby further cooling the battery module 4. Meanwhile, the vaporized cooling liquid can be more uniformly distributed in the battery module 4, thereby improving the uniformity of heat dissipation of the battery module 4.

[0034] It can be understood that the liquid cooling plate body 11 is plate-shaped and is configured to be thermally coupled with the battery module 4, i.e., the liquid cooling plate body 11 is opposite to and close to the outer surface of the battery module 4, so as to transfer the heat of the battery module 4 to the liquid cooling plate body 11, and absorb heat by the cooling liquid in the liquid cooling plate body 11, thereby cooling the battery module 4. The liquid cooling plate body 11 can be placed at the bottom of the battery module 4, so that the vaporized cooling liquid in the liquid cooling plate body 11 is more easily dispersed into the battery module 4. In order to achieve better cooling effect, the liquid cooling plate 1 can also be arranged on the entire outer surface of the battery module 4. The first air-permeable hole is a small hole arranged on the liquid cooling plate body 11, and its size can be set as needed. The first waterproof air-permeable film 12 is a film through which gas can pass but liquid cannot pass. The first waterproof air-permeable film 12 covers the first air-permeable hole, i.e., the first waterproof air-permeable film 12 can prevent the cooling liquid in the liquid cooling plate body 11 from entering the battery pack through the first air-permeable hole, thereby preventing the cooling liquid from damaging the parts in the battery pack, reducing the material selection requirements of the parts in the battery pack, thereby saving costs, and facilitating the disassembly and maintenance of the battery pack. The cooling liquid can be an electronic fluorinated liquid with excellent thermal physical properties, high thermal stability, no corrosion, non-flammability, narrow boiling point range, and easy vaporization.

[0035] In an embodiment, the liquid cooling plate body 11 has a heat exchange region configured to be thermally coupled with the battery module 4, and the first air-permeable hole is distributed in the heat exchange region.

[0036] It can be understood that the heat exchange region is a region on the surface of the liquid cooling plate body 11 that is opposite and close to the battery module 4, and the first air holes are distributed in the heat exchange region, so that the vaporized cooling liquid can enter the battery module 4 through the first air holes in the heat exchange region. The first air holes can be distributed in the entire heat exchange region, and the first waterproof and breathable film 12 can cover the entire heat exchange region, so as to improve the uniformity of the distribution of the vaporized cooling liquid in the battery module.

[0037] Exemplarily, the first air holes can be uniformly distributed in an array in the heat exchange region, so as to better improve the uniformity of heat dissipation of the battery module 4.

[0038] In an embodiment, the liquid cooling plate body 11 also has a connection region 111 arranged adjacent to the heat exchange region, the cooling liquid flow channel includes an inlet and an outlet located in the connection region 111, and the liquid cooling plate 1 also includes an inlet pipe 1111 connected to the inlet, and an outlet pipe 1112 connected to the outlet.

[0039] It can be understood that the cooling liquid flow channel includes an inlet and an outlet located in the connection region 111, so that the cooling liquid can enter the cooling liquid flow channel through the inlet and then be discharged from the cooling liquid flow channel through the outlet, thereby realizing the flow and replacement of the cooling liquid.

[0040] It can be understood that the battery pack includes a box body 5, the box body 5 has a separated electronic element mounting space and a battery module mounting space inside, the heat exchange region of the liquid cooling plate body 11 is arranged opposite to the battery module 4 in the battery module mounting space, and the connection region 111 of the liquid cooling plate body 11 is arranged opposite to the electronic element (such as a BMS control system) in the electronic element mounting space.

[0041] In an embodiment, the first waterproof and breathable film 12 is bonded to the liquid cooling plate body 11.

[0042] It can be understood that the first waterproof and breathable film 12 can be fixed to the liquid cooling plate body 11 by bonding, which is simple to operate.

[0043] In an embodiment, a sealing structure is arranged between the periphery of the first waterproof and breathable film 12 and the liquid cooling plate body 11.

[0044] It can be understood that in order to make the connection between the first waterproof and breathable film 12 and the liquid cooling plate body 11 more stable, and at the same time prevent the cooling liquid from entering the battery pack from the edge of the first waterproof and breathable film 12, a sealing structure can be arranged between the periphery of the first waterproof and breathable film 12 and the liquid cooling plate body 11.

[0045] In one embodiment, the sealing structure may be a sealant layer that covers the periphery of the first waterproof and breathable membrane 12 and the liquid cooling plate body 11 outside the periphery of the first waterproof and breathable membrane 12.

[0046] It is understood that the sealant layer can be set along the periphery of the first waterproof and breathable membrane 12 after the first waterproof and breathable membrane 12 is attached to the liquid cooling plate body 11, so that the sealant layer covers the periphery of the first waterproof and breathable membrane 12 and the liquid cooling plate body 11 outside the periphery of the first waterproof and breathable membrane 12, thereby making the periphery of the first waterproof and breathable membrane 12 fit tightly with the liquid cooling plate body 11.

[0047] Secondly, please refer to Figures 1-4 An embodiment of this utility model provides a cooling system, including the liquid cooling plate 1 described above.

[0048] In one embodiment, the system further includes a coolant collection container 2 and a condenser 3. The coolant collection container 2 is disposed on the side of the battery module 4 away from the liquid cooling plate 1, and the condenser 3 is disposed on the side of the coolant collection container 2 away from the battery module 4.

[0049] It can be understood that the condenser 3 is a condensation device that liquefies the vaporized coolant back into liquid, and the coolant collection container 2 is a container for collecting the coolant liquefied by the condenser 3, thereby realizing the recovery of coolant. The coolant collection container 2 is configured on the side of the battery module 4 away from the liquid cooling plate 1, and the condenser 3 is configured on the side of the coolant collection container 2 away from the battery module 4. This allows the coolant in the liquid cooling plate 1 to vaporize, enter the battery module 4, pass through the battery module 4, and then be liquefied by the condenser 3. After liquefaction, it is collected by the coolant collection container 2, thereby allowing the vaporized coolant to fully contact the battery module 4, improving the cooling effect and heat dissipation uniformity.

[0050] In one embodiment, the coolant collection container 2 is provided with a coolant collection chamber 21, and the coolant collection container 2 is also provided with a second vent 22 communicating with the coolant collection chamber 21. The second vent 22 penetrates the cavity wall of the coolant collection chamber 21, and a second waterproof and breathable membrane 23 is provided inside the coolant collection chamber 21, which covers the second vent 22.

[0051] It can be understood that the second vent 22 is a small hole set on the coolant collection container 2, which penetrates the cavity wall of the coolant collection chamber 21. That is, the second vent 22 can connect the spaces at both ends of the coolant collection container 2, so that the vaporized coolant can pass through the coolant collection container 2 from the battery module 4 through the second vent 22 and then contact the condenser 3. The second waterproof and breathable membrane 23 is a membrane that allows gas to pass through but not liquid. The second waterproof and breathable membrane 23 covers the second vent 22, that is, the second waterproof and breathable membrane 23 can prevent the coolant in the coolant collection chamber 21 from entering the battery pack through the second vent 22, thereby preventing the coolant from damaging the components inside the battery pack, reducing the material requirements for the components inside the battery pack, thus saving costs, and also facilitating the disassembly and maintenance of the battery pack. The second waterproof and breathable membrane 23 can be bonded to the coolant collection chamber 21, or the second waterproof and breathable membrane 23 can be clipped onto the coolant collection container 2.

[0052] In one embodiment, multiple coolant collection chambers 21 are provided at intervals, and reinforcing ribs 24 are provided between the multiple coolant collection chambers 21.

[0053] It is understandable that by setting reinforcing ribs 24 between the coolant collection chambers 21, the strength of the coolant collection chambers 21 can be improved, thereby enhancing the coolant collection chambers 21's ability to support the coolant.

[0054] In one embodiment, the coolant collection container 2 is further provided with a spray nozzle 25, which communicates with the coolant collection chamber 21 and is configured to face the battery module 4.

[0055] It is understandable that when the battery module 4 experiences thermal runaway, the coolant in the coolant collection container 2 can be sprayed onto the battery module 4 through the spray nozzle 25, thereby cooling the battery module 4. After absorbing the heat from the battery module 4, the coolant can be vaporized again and come into contact with the condenser 3 again through the second vent 22 and the second waterproof and breathable membrane 23. After being liquefied, it is stored in the coolant collection container 2. This cycle can not only dissipate heat from the battery pack more efficiently, but also prevent the thermal runaway of the battery pack from worsening.

[0056] In one embodiment, an acoustic sensor is also included, and the spray nozzle 25 is provided with a solenoid valve, the acoustic sensor being communicatively connected to the solenoid valve.

[0057] It can be understood that an acoustic sensor is a sensor that can determine whether a battery pack has experienced thermal runaway based on the specific sound waves generated when thermal runaway occurs. When the acoustic sensor detects the sound waves indicating thermal runaway, the solenoid valve of the spray nozzle 25 opens, allowing the coolant stored in the coolant collection container 2 to be sprayed out from the spray nozzle 25, thus cooling the battery more quickly and effectively preventing the thermal runaway of the battery cells from worsening and reducing losses. The acoustic sensor can be installed inside the battery pack to better collect sound information within the battery pack.

[0058] Thirdly, please refer to Figures 1-4 An embodiment of this utility model provides a battery pack including the cooling system described above.

[0059] In one embodiment, the battery pack further includes a housing 5, the battery module 4 is disposed inside the housing 5, the housing 5 has an opening 51, the housing 5 is fixedly connected to the liquid cooling plate body 11 and the opening 51 is sealed, and the coolant collection container 2 of the cooling system and the condenser 3 are respectively fixedly connected to the housing 5.

[0060] It is understood that the liquid cooling plate body 11 is fixedly connected to the housing 5 and seals the opening 51 of the housing 5. That is, the liquid cooling plate body can serve as the bottom of the housing 5, which can save materials for the housing 5 and facilitate the installation of the liquid cooling plate body 11. The coolant collection container 2 and the condenser 3 are fixedly connected to the housing 5, that is, the coolant collection container 2 and the condenser 3 are integrated into the housing 5, which can facilitate the assembly of the battery pack. The coolant collection container 2 and the condenser 3 can be integrated into the top of the housing 5, and the space below the coolant collection container 2 is the battery module installation space.

[0061] In one embodiment, the housing 5 is provided with a coolant outlet, which is connected to the coolant collection chamber 21.

[0062] It is understandable that when too much coolant is collected in the coolant collection chamber 21, it can be discharged out of the battery pack through the coolant outlet.

[0063] In one embodiment, the battery pack further includes a coolant reservoir, which is connected to the coolant collection container 2 and the liquid cooling plate body 11.

[0064] It is understandable that when there is too much coolant in the coolant receiving container 2, it can be discharged into the coolant storage tank for storage. The coolant stored in the coolant storage tank can then be transported back to the liquid cooling plate body 11, thereby realizing the recycling of coolant.

[0065] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid-cooled plate, characterized in that, Applied to a battery pack, the battery pack including a battery module, the liquid cooling plate includes: The liquid cooling plate body is configured to be thermally coupled to the battery module. The liquid cooling plate body has a coolant flow channel inside and a first vent hole communicating with the coolant flow channel on the liquid cooling plate body. A first waterproof and breathable membrane is disposed on the liquid cooling plate body and covers the first vent hole.

2. The liquid cooling plate according to claim 1, characterized in that, The liquid cooling plate body has a heat exchange area, which is configured to be thermally coupled to the battery module, and the first vent is distributed in the heat exchange area.

3. The liquid cooling plate according to claim 2, characterized in that, The liquid cooling plate body also has a connection area adjacent to the heat exchange area. The coolant flow channel includes an inlet and an outlet located in the connection area. The liquid cooling plate also includes an inlet pipe connected to the inlet and an outlet pipe connected to the outlet.

4. The liquid-cooled plate according to any one of claims 1 to 3, characterized in that, The first waterproof and breathable membrane is bonded to the liquid cooling plate body.

5. The liquid-cooled plate according to any one of claims 1 to 3, characterized in that, A sealing structure is provided between the periphery of the first waterproof and breathable membrane and the liquid cooling plate body.

6. A cooling system, characterized in that, Includes the liquid cooling plate as described in any one of claims 1 to 5.

7. The cooling system according to claim 6, characterized in that, It also includes a coolant collection container and a condenser, wherein the coolant collection container is disposed on the side of the battery module away from the liquid cooling plate, and the condenser is disposed on the side of the coolant collection container away from the battery module.

8. The cooling system according to claim 7, characterized in that, The coolant collection container is provided with a coolant collection chamber. The coolant collection container is also provided with a second vent hole that communicates with the coolant collection chamber. The second vent hole penetrates the cavity wall of the coolant collection chamber. A second waterproof and breathable membrane is provided inside the coolant collection chamber, and the second waterproof and breathable membrane covers the second vent hole.

9. The cooling system according to claim 8, characterized in that, Multiple coolant collection chambers are provided at intervals, and reinforcing ribs are provided between the multiple coolant collection chambers.

10. The cooling system according to claim 7, characterized in that, The coolant collection container is also provided with a spray nozzle, which is connected to the coolant collection chamber and is configured to face the battery module.

11. The cooling system according to claim 10, characterized in that, It also includes an acoustic sensor, and the spray nozzle is equipped with a solenoid valve, with the acoustic sensor communicating with the solenoid valve.

12. A battery pack, characterized in that, Includes the cooling system as described in any one of claims 6-11.

13. The battery pack according to claim 12, characterized in that, The battery pack also includes a housing, in which the battery module is disposed. The housing has an opening, and the housing is fixedly connected to the liquid cooling plate body and the opening is sealed. The coolant collection container and condenser of the cooling system are respectively fixedly connected to the housing.

14. The battery pack according to claim 13, characterized in that, The housing is provided with a coolant outlet, which is connected to the coolant collection chamber.

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