Pressure relief liquid cooling assembly and battery pack

Abstract

The utility model provides a pressure relief liquid cooling assembly and a battery pack. The pressure relief liquid cooling assembly comprises a first liquid cooling piece and a second liquid cooling piece, the first liquid cooling piece is internally provided with a first liquid cooling flow channel, the second liquid cooling piece is arranged opposite to the first liquid cooling piece in the first direction, the second liquid cooling piece is internally provided with a second liquid cooling flow channel, and a gap is formed between the second liquid cooling piece and the first liquid cooling piece to form a pressure relief channel, a first pressure relief hole is formed in the first liquid cooling part, penetrates through the first liquid cooling part in the first direction, is communicated with the pressure relief channel, and is used for being communicated with an anti-explosion valve of at least part of battery cells in the battery module. The first liquid cooling piece and the second liquid cooling piece are directly spliced to form the pressure relief channel, pressure relief and liquid cooling are integrated, the pressure relief channel does not need to be independently arranged, and therefore the overall space occupation ratio of the pressure relief liquid cooling assembly can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pressure relief liquid cooling assembly and a battery pack. Background Art

[0002] With the rapid development of battery technology, the safety design of battery packs has received widespread attention. The battery pack is composed of multiple battery modules. When the battery cells in the battery module experience thermal runaway, a large amount of high-temperature gas will be instantly released from the battery cells accompanied by flames. In related technologies, pressure relief channels and liquid cooling channels are set in the battery pack to prevent gas and flames from spreading inside the battery pack and causing safety accidents such as fire or explosion. However, in related technologies, the designs of the pressure relief channel and the liquid cooling channel are independent of each other. It is necessary to set up an additional liquid cooling channel on the basis of the pressure relief assembly, or to set up an additional pressure relief channel on the basis of the liquid cooling assembly, which makes the overall space of the pressure relief liquid cooling assembly occupy a large proportion, which is not conducive to the space utilization of the battery pack when the pressure relief liquid cooling assembly is assembled into a battery pack. Utility Model Content

[0003] The embodiments of the present application provide a pressure relief liquid cooling assembly and a battery pack, which can improve the technical problem in the related art that the overall space occupied by the pressure relief liquid cooling assembly is relatively large.

[0004] In a first aspect, an embodiment of the present application provides a pressure relief liquid cooling component, comprising:

[0005] a first liquid cooling member, wherein a first liquid cooling channel is provided in the first liquid cooling member;

[0006] a second liquid cooling element, arranged opposite to the first liquid cooling element along a first direction, a second liquid cooling channel being arranged in the second liquid cooling element, the second liquid cooling element being connected to the first liquid cooling element, and a gap being arranged between the second liquid cooling element and the first liquid cooling element to form a pressure relief channel;

[0007] Among them, a first pressure relief hole is opened on the first liquid cooling component, the first pressure relief hole penetrates the first liquid cooling component along the first direction, the first pressure relief hole is connected with the pressure relief channel, and the first pressure relief hole is used to connect to the explosion-proof valve of at least part of the battery cells in the battery module.

[0008] In one embodiment, a second pressure relief hole is provided on the second liquid cooling component, the second pressure relief hole penetrates the second liquid cooling component along the first direction, the second pressure relief hole is connected to the pressure relief channel, and the second pressure relief hole is used to connect to the explosion-proof valve of at least part of the battery cells in the battery module.

[0009] In one embodiment, a plurality of the first pressure relief holes are formed on the first liquid cooling member, a plurality of the second pressure relief holes are formed on the second liquid cooling member, and in the first direction, the plurality of the first pressure relief holes and the plurality of the second pressure relief holes are staggered.

[0010] In one embodiment, the first liquid cooling member includes a first connecting plate and a first liquid cooling plate which are arranged opposite to each other along the first direction, the first liquid cooling plate protrudes in a direction away from the first connecting plate to form a first protrusion, and the first protrusion and the first connecting plate are enclosed to form the first liquid cooling channel; or,

[0011] The second liquid cooling component includes a second connecting plate and a second liquid cooling plate arranged opposite to each other along the first direction, the second liquid cooling plate protrudes in a direction away from the second connecting plate to form a second protrusion, the second protrusion and the second connecting plate are combined to form the second liquid cooling channel; the pressure relief channel is formed between the second liquid cooling plate and the first liquid cooling plate.

[0012] In one embodiment, the first liquid cooling member includes a first connecting plate and a first liquid cooling plate which are arranged opposite to each other along the first direction, the first liquid cooling plate protrudes in a direction away from the first connecting plate to form a first protrusion, and the first protrusion and the first connecting plate are enclosed to form the first liquid cooling channel;

[0013] The second liquid cooling component includes a second connecting plate and a second liquid cooling plate arranged opposite to each other along the first direction, the second liquid cooling plate protrudes in a direction away from the second connecting plate to form a second protrusion, the second protrusion and the second connecting plate are combined to form the second liquid cooling channel; the pressure relief channel is formed between the second liquid cooling plate and the first liquid cooling plate.

[0014] In one embodiment, in the first direction, the first protrusion and the second protrusion are staggered.

[0015] In one embodiment, in the first direction, a gap is provided between the first protruding portion and the second protruding portion; or,

[0016] A side of the first protrusion facing the second liquid cooling plate at least partially abuts against a side of the second protrusion facing the first liquid cooling plate.

[0017] In one embodiment, the first liquid cooling channel is disposed around the first pressure relief hole; and / or the second liquid cooling channel is disposed around the second pressure relief hole.

[0018] In one embodiment, the pressure relief liquid cooling assembly further includes a seal, which is connected between the first liquid cooling component and the second liquid cooling component. In the first direction, at least one surface on two opposite sides of the seal is provided with a groove, and the groove is filled with sealant.

[0019] In a second aspect, an embodiment of the present application provides a battery pack, the battery pack comprising:

[0020] The pressure relief liquid cooling assembly described in any of the above items;

[0021] The battery module is connected to the pressure relief liquid cooling assembly, and the explosion-proof valve of the battery cell in the battery module is connected to the first pressure relief hole or the second pressure relief hole in the pressure relief liquid cooling assembly.

[0022] In one embodiment, the battery pack includes a plurality of the pressure relief liquid cooling components, and the plurality of the pressure relief liquid cooling components are spaced apart along the first direction, and a receiving space is formed between any two adjacent pressure relief liquid cooling components, and the receiving space is used to install the battery module; the battery pack also includes a pressure relief pipe, and the pressure relief pipe is connected to the pressure relief channels in the plurality of the pressure relief liquid cooling components.

[0023] Beneficial effects of the embodiments of the present application:

[0024] In an embodiment of the present application, a pressure relief channel is formed by directly splicing the first liquid cooling component and the second liquid cooling component, and a pressure relief hole is directly opened on the first liquid cooling component to connect with the explosion-proof valve of the battery cell in the battery module. An integrated design of pressure relief liquid cooling of the battery module can be achieved without the need to design an additional pressure relief channel separately, thereby effectively reducing the overall space occupied by the pressure relief liquid cooling component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic diagram of the three-dimensional structure of a pressure relief liquid cooling component provided in an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of an exploded structure of a pressure relief liquid cooling component provided in an embodiment of the present application;

[0028] Figure 3 is a schematic cross-sectional structural diagram of a pressure relief liquid cooling assembly provided in an embodiment of the present application;

[0029] Figure 4 is a schematic diagram comparing the planar structures of a first liquid cooling plate and a second liquid cooling plate provided in an embodiment of the present application;

[0030] Figure 5 is a schematic diagram comparing the planar structures of a first connecting plate and a second connecting plate provided in an embodiment of the present application;

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10. Battery pack;

[0034] 100, pressure relief liquid cooling assembly; 110, first liquid cooling member; 111, first liquid cooling channel; 112, first pressure relief hole; 113, first connecting plate; 114, first liquid cooling plate; 1141, first protrusion; 120, second liquid cooling member; 121, second liquid cooling channel; 122, second pressure relief hole; 123, second connecting plate; 124, second liquid cooling plate; 1241, second protrusion; 130, pressure relief channel; 140, water inlet; 150, water outlet; 160, sealing member; 161, groove; X, first direction; Y, second direction;

[0035] 200, accommodation space; 300, battery module; 400, pressure relief pipe; 500, liquid cooling pipe. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0037] The embodiments of the present application provide a pressure relief liquid cooling assembly and a battery pack, which are described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0038] First, the embodiment of the present application provides a pressure relief liquid cooling component, such as Figures 1 to 3As shown, the pressure relief liquid cooling assembly 100 includes a first liquid cooling member 110 and a second liquid cooling member 120, wherein a first liquid cooling channel 111 is provided in the first liquid cooling member 110, and the second liquid cooling member 120 is arranged opposite to the first liquid cooling member 110 along the first direction X, wherein a second liquid cooling channel 121 is provided in the second liquid cooling member 120, and the second liquid cooling member 120 is connected to the first liquid cooling member 110, and a gap is provided between the second liquid cooling member 120 and the first liquid cooling member 110 to form a pressure relief channel 130. That is, the first liquid cooling member 110 and the second liquid cooling member 120, while serving as a cooling structure, also directly form a pressure relief channel 130 by splicing to realize an integrated design of pressure relief liquid cooling.

[0039] The first liquid cooling element 110 is provided with a first pressure relief hole 112, which penetrates the first liquid cooling element 110 along the first direction X, and is communicated with the pressure relief channel 130, and is used to communicate with the explosion-proof valves of at least some of the cells in the battery module 300. That is, the first liquid cooling element 110 is a side of the pressure relief liquid cooling assembly 100 connected to the battery module 300, and by providing a pressure relief hole communicated with the pressure relief channel 130 on the first liquid cooling element 110, and communicating with the explosion-proof valves of at least some of the cells in the battery module 300, when thermal runaway occurs in the cells in the battery module 300, the high-temperature gas generated can enter the pressure relief channel 130 through the pressure relief hole, and the first liquid cooling element 110 and the second liquid cooling element 120 can also cool the gas in the pressure relief channel 130 while being discharged through the pressure relief channel 130, so as to reduce the risk of safety accidents such as thermal runaway diffusion and explosion.

[0040] It should be noted that the first liquid cooling component 110 and the second liquid cooling component 120 are respectively provided with a water inlet 140 and a water outlet 150, which are used to connect with the liquid cooling pipe 500 to realize the circulation of the liquid cooling medium in the first liquid cooling channel 111 and the second liquid cooling channel 121.

[0041] The embodiment of the present application directly splices the first liquid cooling part 110 and the second liquid cooling part 120 to form the pressure relief channel 130, and directly opens a pressure relief hole on the first liquid cooling part 110 to communicate with the explosion-proof valve of the battery cell in the battery module 300, so as to realize an integrated design of pressure relief liquid cooling of the battery module 300 without additionally designing the pressure relief channel 130, thereby effectively reducing the overall space occupation of the pressure relief liquid cooling component 100. When the pressure relief liquid cooling component 100 is applied to the battery pack 10, the space utilization rate of the battery pack 10 can be improved. At the same time, the direct splicing of the first liquid cooling part 110 and the second liquid cooling part 120 also makes the formation of the pressure relief channel 130 simpler and more convenient, and also facilitates the troubleshooting and maintenance of leakage and the like that occur during the use of the pressure relief liquid cooling component 100.

[0042] Optionally, a second pressure relief hole 122 is provided on the second liquid cooling member 120, and the second pressure relief hole 122 penetrates the second liquid cooling member 120 along the first direction X, and the second pressure relief hole 122 is communicated with the pressure relief channel 130, and the second pressure relief hole 122 is used to communicate with the explosion-proof valve of at least part of the battery cells in the battery module 300. That is, the two opposite sides of the pressure relief liquid cooling assembly 100 in the first direction X can be used to connect with the battery module 300, and respectively communicate with the explosion-proof valves of at least part of the battery cells in the corresponding battery module 300, that is, one pressure relief liquid cooling assembly 100 can serve as the pressure relief channel 130 of two battery modules 300, thereby helping to further reduce the overall space occupation of the pressure relief liquid cooling assembly 100 and improve the space utilization of the corresponding battery pack 10.

[0043] In some embodiments, Figures 3 to 5 As shown, a plurality of first pressure relief holes 112 are provided on the first liquid cooling component 110, and a plurality of second pressure relief holes 122 are provided on the second liquid cooling component 120. In the first direction X, the plurality of first pressure relief holes 112 and the plurality of second pressure relief holes 122 are staggered, that is, the orthographic projections of the first pressure relief holes 112 and the second pressure relief holes 122 in the first direction X do not overlap, that is, in the first direction X, the first pressure relief hole 112 can be regarded as being located between two adjacent second pressure relief holes 122, and the second pressure relief hole 122 can be regarded as being located between two adjacent first pressure relief holes 112, thereby achieving the staggered arrangement of the first pressure relief holes 112 and the second pressure relief holes 122 in the first direction X. This is because the first pressure relief hole 112 is used to communicate with the explosion-proof valve of at least some of the battery cells in one battery module 300, and the second pressure relief hole 122 is connected to the explosion-proof valve of at least some of the battery cells in another battery module 300. When thermal runaway occurs in the battery cells in one of the battery modules 300, the gas and debris ejected from the battery cells will enter the pressure relief channel 130 through the corresponding pressure relief holes. By staggering the first pressure relief hole 112 and the second pressure relief hole 122, the generated gas and debris can be prevented from affecting the battery cells in another battery module 300, thereby reducing the risk of safety accidents such as thermal runaway spread and explosion.

[0044] It should be noted that when the pressure relief liquid cooling assembly 100 is assembled and connected with the battery module 300, a layer of mica sheet can be attached between the explosion-proof valve of the battery cell in the battery module 300 and the corresponding first pressure relief hole 112 or the second pressure relief hole 122. When the corresponding battery cell has thermal runaway, the flame ejected from the battery cell can break through the mica sheet and enter the pressure relief channel 130 through the corresponding pressure relief hole. However, the setting of the mica sheet can play a certain buffering role and can play a certain blocking role on the debris ejected when the battery cell has thermal runaway, thereby reducing the impact on the battery cell in the battery module 300 on the other side.

[0045] Among them, the first pressure relief hole 112 and the second pressure relief hole 122 can extend along the second direction Y, and the second direction Y forms an angle with the first direction X, that is, the first pressure relief hole 112 and the second pressure relief hole 122 are strip-shaped, and multiple first pressure relief holes 112 and multiple second pressure relief holes 122 can be arranged in multiple rows and columns respectively, and their distribution method is consistent with the distribution method of multiple battery cells in the corresponding battery module 300, so that one pressure relief hole can be connected to the explosion-proof valves of multiple battery cells in the battery module 300, thereby reducing the number of openings on the first liquid cooling part 110 and the second liquid cooling part 120, and also facilitates the grouping design of multiple battery cells in the battery module 300.

[0046] In other embodiments, the pressure relief liquid cooling assembly 100 includes a third liquid cooling member, which is disposed between the first liquid cooling member 110 and the second liquid cooling member 120, and a third liquid cooling channel is disposed in the third liquid cooling member, and a gap is disposed between the third liquid cooling member and the first liquid cooling member 110 to form a pressure relief channel 130, and a gap is also disposed between the third liquid cooling member and the second liquid cooling member 120 to form a pressure relief channel 130. When the battery modules 300 are disposed on the sides of the first liquid cooling member 110 and the second liquid cooling member 120 of the pressure relief liquid cooling assembly 100, respectively, the third liquid cooling member can not only cool the flames and gases ejected when the battery cells in the two battery modules 300 are in thermal runaway at the same time, but also play a role of blocking, so as to prevent the flames and gases ejected when the battery cells in one of the battery modules 300 are in thermal runaway from affecting the other battery module 300, thereby further reducing the risk of safety accidents such as thermal runaway diffusion and explosion.

[0047] Optional, such as Figure 3 As shown, the first liquid cooling member 110 includes a first connecting plate 113 and a first liquid cooling plate 114 which are arranged opposite to each other along a first direction X. The first liquid cooling plate 114 protrudes in a direction away from the first connecting plate 113 to form a first protrusion 1141. The first protrusion 1141 and the first connecting plate 113 are enclosed to form a first liquid cooling channel 111. That is, the first liquid cooling member 110 is formed by splicing the first connecting plate 113 and the first liquid cooling plate 114, wherein the first connecting plate 113 is a flat plate, and the first liquid cooling plate 114 can be formed by stamping to form the first protrusion 1141. By splicing the first connecting plate 113 and the first liquid cooling plate 114, the first liquid cooling channel 111 can be formed at a position corresponding to the first protrusion 1141 inside the first liquid cooling member 110.

[0048] Correspondingly, the second liquid cooling member 120 includes a second connecting plate 123 and a second liquid cooling plate 124 which are arranged opposite to each other along the first direction X. The second liquid cooling plate 124 protrudes in a direction away from the second connecting plate 123 to form a second protruding portion 1241. The second protruding portion 1241 and the second connecting plate 123 are enclosed to form a second liquid cooling channel 121. That is, the second connecting plate 123 is a flat plate, and the second liquid cooling plate 124 can be formed by stamping to form the second protruding portion 1241. By splicing the second connecting plate 123 and the second liquid cooling plate 124, the second liquid cooling channel 121 can be formed at a position corresponding to the second protruding portion 1241 inside the second liquid cooling member 120.

[0049] Among them, a pressure relief channel 130 is formed between the second liquid cooling plate 124 and the first liquid cooling plate 114, that is, the first protrusion 1141 and the second protrusion 1241 are both protruding toward the pressure relief channel 130, which helps to increase the contact area between the first liquid cooling member 110 and the second liquid cooling member 120 and the pressure relief gas, thereby improving the cooling effect of the pressure relief liquid cooling assembly 100. The first connecting plate 113 and the second connecting plate 123 are used as the connection side with the battery module 300. By setting them as a flat plate structure, it helps to improve the connection stability between the battery module 300 and the pressure relief liquid cooling assembly 100.

[0050] It should be noted that the protrusion can be formed on only one of the first liquid cooling plate 114 and the second liquid cooling plate 124, that is, the first liquid cooling plate 114 protrudes in a direction away from the first connecting plate 113 to form the first protrusion 1141, or the second liquid cooling plate 124 protrudes in a direction away from the second connecting plate 123 to form the second protrusion 1241, while the other side facing the pressure relief channel 130 is still a flat plate structure. The specific structures of the first liquid cooling plate 114 and the second liquid cooling plate 124 can be selected and adjusted according to actual design requirements, and are not particularly limited here.

[0051] In some embodiments, in the first direction X, the first protrusion 1141 and the second protrusion 1241 are staggered, and the orthographic projections of the first protrusion 1141 and the second protrusion 1241 in the first direction X do not overlap. This arrangement enables the first protrusion 1141 and the second protrusion 1241 to be located in different areas in the pressure relief channel 130, thereby helping to improve the uniformity of contact between the pressure relief gas in the pressure relief channel 130 and the pressure relief liquid cooling assembly 100, thereby helping to improve the cooling effect of the pressure relief liquid cooling assembly 100.

[0052] In other embodiments, in the first direction X, a gap is provided between the first protrusion 1141 and the second protrusion 1241, that is, the pressure relief channel 130 between the first liquid cooling plate 114 and the second liquid cooling plate 124 is designed as a whole surface, wherein the pressure relief channel 130 at the position corresponding to the first protrusion 1141 and the second protrusion 1241 is relatively narrow, while the pressure relief channel 130 at the corresponding position in other areas is relatively wide. This arrangement allows the pressure relief gas to have sufficient circulation space and contact area between the first liquid cooling plate 114 and the second liquid cooling plate 124, thereby helping to ensure the cooling effect of the pressure relief liquid cooling assembly 100.

[0053] In some other embodiments, a side of the first protrusion 1141 facing the second liquid cooling plate 124 is at least partially in contact with a side of the second protrusion 1241 facing the first liquid cooling plate 114, that is, when the first liquid cooling component 110 and the second liquid cooling component 120 are spliced ​​to form the pressure relief channel 130, the first protrusion 1141 and the second protrusion 1241 are in contact with each other at least in part, so that the pressure relief gas will automatically be diverted when passing through the abutment between the first protrusion 1141 and the second protrusion 1241. This arrangement allows the gas and flame generated by thermal runaway of the battery cells in the battery module 300 to flow in a direction between the first liquid cooling component 110 and the second liquid cooling component 120, thereby helping to alleviate the spread of the gas and flame in the pressure relief channel 130, thereby achieving directional pressure relief of the battery module 300 by the pressure relief liquid cooling assembly 100.

[0054] Among them, when the first protrusion 1141 and the second protrusion 1241 are continuously abutted in the extension direction, the pressure relief channel 130 can be divided into multiple sub-channels according to the specific shapes of the first protrusion 1141 and the second protrusion 1241, so as to further alleviate the spread of gas and flame in the pressure relief channel 130, and realize the directional pressure relief of the battery module 300 by the pressure relief liquid cooling assembly 100.

[0055] It should be noted that the positional relationship between the first protrusion 1141 and the second protrusion 1241 can be selected and adjusted according to actual design requirements. It is only necessary to ensure the conduction of the pressure relief channel 130 between the first liquid cooling component 110 and the second liquid cooling component 120 to achieve stable pressure relief of the pressure relief liquid cooling component 100. No special restrictions are made here.

[0056] In some embodiments, Figures 3 to 5As shown, the first liquid-cooling channel 111 is arranged around the first pressure relief hole 112, that is, when the first liquid-cooling channel 111 in the first liquid-cooling component 110 is designed, the first liquid-cooling channel 111 as a whole can be arranged back and forth along the second direction Y. If the first liquid-cooling channel 111 is regarded as a plurality of first sub-channels extending along the second direction Y and interconnected, the first pressure relief hole 112 can be correspondingly arranged between two adjacent sub-channels to improve the cooling effect of the first liquid-cooling component 110 on the pressure relief gas.

[0057] Among them, part of the first sub-flow channels can be connected end to end, that is, part of the first sub-flow channels are enclosed to form an annular flow channel, and a pressure relief hole can be correspondingly arranged in the annular flow channel to increase the contact area between the pressure relief gas and the first liquid cooling component 110 after the pressure relief gas enters the pressure relief channel 130 through the pressure relief hole, thereby further improving the cooling effect of the first liquid cooling component 110 on the pressure relief gas.

[0058] Correspondingly, in other embodiments, the second liquid-cooling channel 121 is arranged around the second pressure relief hole, that is, when designing the second liquid-cooling channel 121 in the second liquid-cooling component 120, the second liquid-cooling channel 121 as a whole can be arranged back and forth along the second direction Y. If the second liquid-cooling channel 121 is regarded as a plurality of second sub-channels extending along the second direction Y and interconnected, the second pressure relief hole 122 can be correspondingly arranged between two adjacent sub-channels to improve the cooling effect of the second liquid-cooling component 120 on the pressure relief gas.

[0059] Among them, part of the second sub-flow channels can be connected end to end, that is, part of the second sub-flow channels are enclosed to form an annular flow channel, and a pressure relief hole can be correspondingly arranged in the annular flow channel to increase the contact area between the pressure relief gas and the second liquid cooling component 120 after the pressure relief gas enters the pressure relief channel 130 through the pressure relief hole, thereby further improving the cooling effect of the second liquid cooling component 120 on the pressure relief gas.

[0060] It should be noted that when the first liquid-cooling channel 111 and the second liquid-cooling channel 121 both form annular channels at corresponding positions, the corresponding first protrusion 1141 and the second protrusion 1241 cannot be set to be in full contact at this position, otherwise a closed pressure relief channel 130 will be formed at the position corresponding to the pressure relief hole, resulting in the pressure relief gas entering the pressure relief channel 130 through the pressure relief hole being unable to be discharged through the pressure relief liquid cooling component 100, which may easily lead to safety accidents such as thermal runaway diffusion or explosion.

[0061] Optional, such as Figure 2 and Figure 3As shown, the pressure relief liquid cooling component 100 further includes a sealing member 160, which is connected between the first liquid cooling member 110 and the second liquid cooling member 120. In the first direction X, at least one of the surfaces on the opposite sides of the sealing member 160 is provided with a groove 161, and the groove 161 is filled with sealant. That is, the first liquid cooling member 110 and the second liquid cooling member 120 are sealed by the sealing member 160, wherein the sealing member 160 is annular, and the sealing member 160, the first liquid cooling member 110 and the second liquid cooling member 120 are enclosed together to form the side wall of the pressure relief channel 130. By providing the groove 161 on the surface of the sealing member 160 and filling it with sealant, it is helpful to improve the connection effect and sealing effect of the sealing member 160 and the first liquid cooling member 110 and the second liquid cooling member 120, so as to avoid air leakage and the like during use of the pressure relief liquid cooling component 100.

[0062] It should be noted that after the seal 160 is connected to the first liquid cooling component 110 and the second liquid cooling component 120, a layer of sealant can be applied to the outer surface of the corresponding connection between the seal 160 and the first liquid cooling component 110 and the second liquid cooling component 120 to further enhance the sealing effect of the pressure relief liquid cooling assembly 100 and reduce the risk of air leakage.

[0063] Secondly, an embodiment of the present application provides a battery pack, which includes a pressure relief liquid cooling assembly. The specific structure of the pressure relief liquid cooling assembly refers to the above-mentioned embodiment. Since the battery pack adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0064] like Figure 6 As shown, the battery pack 10 includes a pressure relief liquid cooling assembly 100 and a battery module 300, the battery module 300 is connected to the pressure relief liquid cooling assembly 100, and the explosion-proof valve of the battery cell in the battery module 300 is connected to the first pressure relief hole 112 or the second pressure relief hole 122 in the pressure relief liquid cooling assembly 100. Among them, the battery module 300 can be directly adhered to the pressure relief liquid cooling assembly 100 as a whole, so as to facilitate the rapid assembly of the battery pack 10. When the battery module 300 is adhered to the first liquid cooling part 110 in the pressure relief liquid cooling assembly 100, the explosion-proof valve of at least some of the battery cells in the battery module 300 is connected to the first pressure relief hole 112 on the first liquid cooling part 110; when the battery module 300 is adhered to the second liquid cooling part 120 in the pressure relief liquid cooling assembly 100, the explosion-proof valve of at least some of the battery cells in the battery module 300 is connected to the second pressure relief hole 122 on the second liquid cooling part 120. When thermal runaway occurs in the battery cells of the battery module 300, the gas and flame ejected from the battery cells enter the pressure relief channel 130 through the corresponding pressure relief holes and are discharged. At the same time, the first liquid cooling component 110 and the second liquid cooling component 120 cool the ejected gas and flame to reduce the risk of safety accidents such as thermal runaway spread and explosion.

[0065] Specifically, Figures 1 to 3 As shown, the embodiment of the present application forms a pressure relief channel 130 by directly splicing the first liquid cooling member 110 and the second liquid cooling member 120, and directly opens a pressure relief hole on the first liquid cooling member 110 to communicate with the explosion-proof valve of the battery cell in the battery module 300, so as to realize an integrated design of pressure relief liquid cooling of the battery module 300 without additionally designing the pressure relief channel 130, thereby effectively reducing the overall space occupation of the pressure relief liquid cooling assembly 100. When the pressure relief liquid cooling assembly 100 is applied to the battery pack 10, the space utilization rate of the battery pack 10 can be improved. At the same time, the direct splicing of the first liquid cooling member 110 and the second liquid cooling member 120 also makes the formation of the pressure relief channel 130 simpler and more convenient, and also facilitates the troubleshooting and maintenance of air leakage and the like that occur during the use of the pressure relief liquid cooling assembly 100.

[0066] In some embodiments, Figure 6 As shown, the battery pack 10 includes a plurality of pressure relief liquid cooling components 100, and the plurality of pressure relief liquid cooling components 100 are arranged at intervals along the first direction X, and a receiving space 200 is formed between any two adjacent pressure relief liquid cooling components 100, and the receiving space 200 is used to install the battery module 300, that is, a pressure relief liquid cooling component 100 is respectively arranged on both sides of a battery module 300. On the one hand, by simultaneously adhering the pressure relief liquid cooling components 100 on both sides to the battery module 300, the installation stability of the battery module 300 can be improved, thereby improving the overall structural stability of the battery pack 10; on the other hand, by simultaneously arranging the pressure relief liquid cooling components 100 on both sides of the battery module 300, different battery cells in the battery module 300 can select different pressure relief channels 130, which is also helpful for the arrangement design of multiple battery cells in the battery module 300 to meet different usage requirements.

[0067] Among them, the battery cell includes a positive electrode and a negative electrode, and the explosion-proof valve is set at one end of the positive electrode or the negative electrode. When multiple battery cells are assembled into a battery module 300, the positive and negative electrodes in the multiple battery cells will have different orientations according to the series-parallel requirements. Taking the explosion-proof valve set at one end of the positive electrode as an example, when the pressure relief liquid cooling assembly 100 is set on both sides of the battery module 300, the battery cell with the positive electrode facing one side is connected to the pressure relief hole on the corresponding pressure relief liquid cooling assembly 100, and the battery cell with the positive electrode facing the other side is connected to the pressure relief hole on the corresponding other pressure relief liquid cooling assembly 100, that is, multiple battery cells in a battery module 300 can use two different pressure relief channels 130 for pressure relief, which can not only meet the arrangement design of multiple battery cells in the battery module 300, but also realize directional pressure relief of the battery module 300.

[0068] The battery pack 10 also includes a pressure relief pipe 400, which is connected to the pressure relief channels 130 in multiple pressure relief liquid cooling components 100, that is, each pressure relief liquid cooling component 100 is provided with an exhaust hole, and the pressure relief pipe 400 is connected to the corresponding pressure relief channel 130 through the exhaust holes on each pressure relief liquid cooling component 100, so that the gas and flame generated by thermal runaway flow through the pressure relief channel 130 in the pressure relief liquid cooling component 100 to the pressure relief pipe 400, and then are discharged through the pressure relief pipe 400, thereby achieving directional pressure relief.

[0069] It should be noted that the exhaust holes on the pressure relief liquid cooling assembly 100 need to be opened away from the liquid cooling channels in the first liquid cooling component 110 and the second liquid cooling component 120 to prevent the liquid cooling medium from interfering with the pressure relief process, while also preventing the pressure relief gas from affecting the cooling process of the first liquid cooling component 110 and the second liquid cooling component 120.

[0070] Correspondingly, the battery pack 10 also includes a liquid cooling pipe 500. The first liquid cooling component 110 and the second liquid cooling component 120 are correspondingly provided with a water inlet 140 and a water outlet 150. The liquid cooling pipe 500 is connected to the first liquid cooling channel 111 and the second liquid cooling channel 121 through the water inlet 140 and the water outlet 150. The liquid cooling pipe 500 is used to introduce and discharge the liquid cooling medium to realize the circulation of the liquid cooling medium in the first liquid cooling channel 111 and the second liquid cooling channel 121.

[0071] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pressure relief liquid cooling component, characterized in that: include: a first liquid cooling member, wherein a first liquid cooling channel is provided in the first liquid cooling member; a second liquid cooling element, arranged opposite to the first liquid cooling element along a first direction, a second liquid cooling channel being arranged in the second liquid cooling element, the second liquid cooling element being connected to the first liquid cooling element, and a gap being arranged between the second liquid cooling element and the first liquid cooling element to form a pressure relief channel; Among them, a first pressure relief hole is opened on the first liquid cooling component, the first pressure relief hole penetrates the first liquid cooling component along the first direction, the first pressure relief hole is connected with the pressure relief channel, and the first pressure relief hole is used to connect to the explosion-proof valve of at least part of the battery cells in the battery module.

2. The pressure relief liquid cooling assembly according to claim 1, characterized in that: A second pressure relief hole is provided on the second liquid cooling component. The second pressure relief hole penetrates the second liquid cooling component along the first direction. The second pressure relief hole is connected to the pressure relief channel. The second pressure relief hole is used to connect to the explosion-proof valve of at least part of the battery cells in the battery module.

3. The pressure relief liquid cooling assembly according to claim 2, characterized in that: The first liquid cooling member is provided with a plurality of the first pressure relief holes, and the second liquid cooling member is provided with a plurality of the second pressure relief holes. In the first direction, the plurality of the first pressure relief holes and the plurality of the second pressure relief holes are staggered.

4. The pressure relief liquid cooling assembly according to claim 1, characterized in that: The first liquid cooling member comprises a first connecting plate and a first liquid cooling plate which are arranged opposite to each other along the first direction, the first liquid cooling plate protrudes in a direction away from the first connecting plate to form a first protrusion, and the first protrusion and the first connecting plate are enclosed to form the first liquid cooling channel; or, The second liquid cooling component includes a second connecting plate and a second liquid cooling plate arranged opposite to each other along the first direction, the second liquid cooling plate protrudes in a direction away from the second connecting plate to form a second protrusion, the second protrusion and the second connecting plate are combined to form the second liquid cooling channel; the pressure relief channel is formed between the second liquid cooling plate and the first liquid cooling plate.

5. The pressure relief liquid cooling assembly according to claim 1, characterized in that: The first liquid cooling member includes a first connecting plate and a first liquid cooling plate which are arranged opposite to each other along the first direction, the first liquid cooling plate protrudes in a direction away from the first connecting plate to form a first protrusion, and the first protrusion and the first connecting plate are enclosed to form the first liquid cooling channel; The second liquid cooling component includes a second connecting plate and a second liquid cooling plate arranged opposite to each other along the first direction, the second liquid cooling plate protrudes in a direction away from the second connecting plate to form a second protrusion, the second protrusion and the second connecting plate are combined to form the second liquid cooling channel; the pressure relief channel is formed between the second liquid cooling plate and the first liquid cooling plate.

6. The pressure relief liquid cooling assembly according to claim 5, characterized in that: In the first direction, the first protrusion and the second protrusion are staggered.

7. The pressure relief liquid cooling assembly according to claim 5, characterized in that: In the first direction, a gap is provided between the first protrusion and the second protrusion; or, A side of the first protrusion facing the second liquid cooling plate at least partially abuts against a side of the second protrusion facing the first liquid cooling plate.

8. The pressure relief liquid cooling assembly according to claim 2, characterized in that: The first liquid cooling channel is disposed around the first pressure relief hole; and / or the second liquid cooling channel is disposed around the second pressure relief hole.

9. The pressure relief liquid cooling assembly according to any one of claims 1 to 8, characterized in that: The pressure relief liquid cooling component also includes a sealing member connected between the first liquid cooling member and the second liquid cooling member. In the first direction, at least one surface of the two opposite sides of the sealing member is provided with a groove filled with sealant.

10. A battery pack, characterized in that: The battery pack comprises: The pressure relief liquid cooling assembly according to any one of claims 1 to 9; The battery module is connected to the pressure relief liquid cooling assembly, and the explosion-proof valve of the battery cell in the battery module is connected to the first pressure relief hole or the second pressure relief hole in the pressure relief liquid cooling assembly.

11. The battery pack according to claim 10, characterized in that: The battery pack includes a plurality of the pressure relief liquid cooling components, and the plurality of the pressure relief liquid cooling components are spaced apart along the first direction, and a receiving space is formed between any two adjacent pressure relief liquid cooling components, and the receiving space is used to install the battery module; the battery pack also includes a pressure relief pipe, and the pressure relief pipe is connected to the pressure relief channels in the plurality of the pressure relief liquid cooling components.

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