Battery pack box body and battery pack

Abstract

The utility model provides a battery pack box body and a battery pack, the battery pack box body comprises two box body parts and a second liquid cooling plate, each box body part comprises a first side plate and a first liquid cooling plate which are integrally connected, the two first side plates are oppositely arranged in a spaced mode in the first direction and form a mounting space used for mounting battery cells, and the second liquid cooling plate is arranged in the mounting space. First liquid cooling channels are formed in the first liquid cooling plates, the two first liquid cooling plates are located on the same side of the installation space in the second direction, and an included angle is formed between the second direction and the first direction; the second liquid cooling plate is welded between the two first liquid cooling plates, one side plate surface of the second liquid cooling plate faces the mounting space, and a second liquid cooling channel communicated with the first liquid cooling channel is arranged in the second liquid cooling plate. According to the battery pack box body and the battery pack provided by the embodiment of the invention, the qualified rate of the whole liquid cooling plate formed by welding the first liquid cooling plate and the second liquid cooling plate can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly relates to a battery pack box body and a battery pack. Background Art

[0002] The battery cells of a battery pack are installed in a battery pack box body composed of a liquid cooling plate and side plates, so as to cool down the battery cells through the liquid cooling plate. In related technologies, in order to improve the connection strength and sealing stability between the liquid cooling plate and the side plates, the liquid cooling plate and the side plates are formed by extrusion molding of profiles, and then the two extruded profiles are spliced to form the battery pack box body. For a battery pack box body with a relatively large requirement for the width of the liquid cooling plate, the qualified rate of forming the liquid cooling plate by extrusion molding of profiles is relatively low. Summary of the Utility Model

[0003] Embodiments of this application provide a battery pack box body and a battery pack, which can improve the technical problem that the qualified rate of forming the liquid cooling plate by extrusion molding of profiles is relatively low for a battery pack box body with a relatively large requirement for the width of the liquid cooling plate.

[0004] In a first aspect, embodiments of this application provide a battery pack box body, including:

[0005] Two box body components, the box body components include a first side plate and a first liquid cooling plate integrally connected. The two first side plates are relatively spaced apart along a first direction and form an installation space for installing battery cells. A first liquid cooling channel is provided in the first liquid cooling plate. The two first liquid cooling plates are located on the same side of the installation space along a second direction, and the second direction is set at an angle with the first direction;

[0006] A second liquid cooling plate, welded between the two first liquid cooling plates. One side plate surface of the second liquid cooling plate faces the installation space, and a second liquid cooling channel communicated with the first liquid cooling channel is provided in the second liquid cooling plate.

[0007] In some embodiments, a first communication hole communicated with the first liquid cooling channel is provided on one side of the first liquid cooling plate facing the second liquid cooling plate. Second communication holes communicated with the second liquid cooling channel are respectively provided on two sides of the second liquid cooling plate along the first direction. The first communication holes of the two first liquid cooling plates are in one-to-one correspondence and communication with the second communication holes, so that the first liquid cooling channels of the two first liquid cooling plates are respectively communicated with the second liquid cooling channel.

[0008] In some embodiments, the first communication hole is located at one end of the first liquid cooling plate along a third direction, and the first direction and the second direction are respectively set at an angle with the third direction.

[0009] In some embodiments, the first liquid cooling channel includes a plurality of first sub-channels, which are sequentially distributed along the first direction, and the plurality of first sub-channels respectively extend along the third direction. The first sub-channel close to the second liquid cooling plate is communicated with the first communication hole, and the first direction and the second direction are respectively arranged at an angle with the third direction; and / or,

[0010] The second liquid cooling channel includes a plurality of second sub-channels, which are sequentially distributed along the second direction, and the plurality of second sub-channels respectively extend along the third direction. Two second sub-channels located on both sides of the second liquid cooling plate along the first direction are in one-to-one correspondence and communication with the two second communication holes, and the first direction and the second direction are respectively arranged at an angle with the third direction.

[0011] In some embodiments, at least one end of the first liquid cooling plate along the third direction is provided with a first opening communicated with the plurality of first sub-channels, and a first notch is provided on one side of the first opening close to the second liquid cooling plate; the same end of the second liquid cooling plate along the third direction is provided with a second opening communicated with the plurality of second sub-channels, and a second notch is provided on at least one side of the second opening close to the first liquid cooling plate;

[0012] The battery pack box body further includes a seal connected to the first liquid cooling plate and the second liquid cooling plate. The seal seals the first opening and the second opening, and the seal and the first notch enclose to form the first communication hole, and the seal and the second notch enclose to form the second communication hole.

[0013] In some embodiments, the first liquid cooling plate includes a first partition located between two adjacent first sub-channels. One end of the first partition along the third direction has a first gap with the seal, and the first sub-channels on both sides of the first partition are communicated through the first gap; and / or,

[0014] The second liquid cooling plate further includes a second partition located between two adjacent second sub-channels. There is a second gap between the second partition and the seal, and the second sub-channels on both sides of the second partition are communicated through the second gap.

[0015] In some embodiments, the ratio of the sum of the widths of the two first liquid cooling plates in the first direction to the width of the second liquid cooling plate in the first direction is greater than or equal to 20% and less than or equal to 50%.

[0016] In some embodiments, the battery pack housing further includes two second side plates disposed opposite to each other. The two second side plates are distributed on both sides of the installation space along a third direction. The first side plate, the first liquid cooling plate, and the second liquid cooling plate are respectively connected to the second side plate. The first direction and the second direction are respectively disposed at an angle to the third direction.

[0017] In some embodiments, the two first liquid cooling plates respectively include mounting plates. The two mounting plates are located on one side of the same second side plate facing away from the installation space. The side of the mounting plate facing the second side plate has a mounting surface. A liquid inlet joint communicating with the corresponding first liquid cooling channel is provided on the mounting surface of one of the mounting plates, and a liquid outlet joint communicating with the corresponding first liquid cooling channel is provided on the mounting surface of the other mounting plate.

[0018] In some embodiments, the first liquid cooling plate is of a flat plate structure; and / or, the second liquid cooling plate is of a flat plate structure.

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

[0020] A battery pack housing, which is the battery pack housing as described above. The battery pack housing includes two housing components and a second liquid cooling plate. The housing components include a first side plate and a first liquid cooling plate integrally connected. The two first side plates are relatively spaced apart along a first direction and form an installation space for installing battery cells. The first liquid cooling plate is provided with a first liquid cooling channel. The two first liquid cooling plates are located on the same side of the installation space along a second direction. The second direction is disposed at an angle to the first direction. The second liquid cooling plate is welded between the two first liquid cooling plates. One side plate surface of the second liquid cooling plate faces the installation space. The second liquid cooling plate is provided with a second liquid cooling channel communicating with the first liquid cooling channel;

[0021] Battery cells, installed in the installation space.

[0022] The beneficial effects of the embodiments of the present application:

[0023] In the embodiments of the present application, by welding a second liquid cooling plate between the first liquid cooling plates of two box components, one side plate surface of the second liquid cooling plate faces the installation space between the first side plates of the two box components, and the second liquid cooling channels of the second liquid cooling plate are communicated with the first liquid cooling channels of the first liquid cooling plates, it is possible to combine the first liquid cooling plates of the two box components and the second liquid cooling plate to form a liquid cooling plate structure with a relatively wide width. Moreover, since the second liquid cooling plate is welded between the two first liquid cooling plates, without changing the overall width of the liquid cooling plate structure in the first direction, the width of the first liquid cooling plate in the first direction can be reduced, thereby reducing the width of the profile for forming the box component by extrusion molding, which is beneficial to reducing the difficulty and cost of extrusion molding of the profile, improving the flatness of the first liquid cooling plate and the side plate formed by extrusion of the profile, and thus improving the qualification rate of the overall liquid cooling plate formed by welding the first liquid cooling plate and the second liquid cooling plate. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagram of an embodiment of the battery pack box provided by the embodiment of the present application;

[0026] Figure 2 Exploded structural schematic diagram of an embodiment of the battery pack box provided by the embodiment of the present application;

[0027] Figure 3 For Figure 2 Enlarged view of part A in

[0028] Figure 4 For Figure 1 Cross-sectional view along the A-A direction in

[0029] Figure 5 Front view of an embodiment of the battery pack box provided by the embodiment of the present application, where the seal is not shown.

[0030] Battery pack housing 100; installation space 1001; housing component 110; first side plate 111; first liquid cooling plate 112; first liquid cooling channel 1120; first sub-channel 1121; first opening 1122; first notch 1123; first communication hole 1124; first partition 1125; first interval 1126; mounting plate 1127; mounting surface 1128; second liquid cooling plate 120; second liquid cooling channel 121; second sub-channel 1211; second opening 1212; second notch 1213; second communication hole 1214; second partition 1215; second interval 1216; seal 130; second side plate 140; liquid inlet connector 151; liquid outlet connector 152; first direction X; second direction Y; third direction Z. Detailed implementation manners

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners 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 orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0032] In the related art, the battery cells of the battery pack are installed in the battery pack housing composed of a liquid cooling plate and a side plate, so as to cool the battery cells through the liquid cooling plate. In order to improve the connection strength and sealing stability between the liquid cooling plate and the side plate, a method of extruding profiles can be used to form part of the liquid cooling plate and part of the side plate of the battery pack housing, and then the two extruded profiles are spliced together to form the battery pack housing. Among them, the parts of the two profiles that are extruded to form the liquid cooling plate are combined to form the overall liquid cooling plate, and an installation space for installing the battery cells is formed between the side plates extruded by the two profiles.

[0033] However, for a battery pack housing with a relatively large width requirement for the liquid cooling plate, profiles with a relatively large width need to be used to extrude the liquid cooling plate and the side plate. The larger the width of the profile, the greater the difficulty and cost of extrusion molding, and it is easy to have the flatness of the extruded liquid cooling plate and side plate not meeting the requirements. Therefore, in the related art, the qualified rate of forming the overall liquid cooling plate by extruding profiles is relatively low.

[0034] In order to at least to some extent improve the above problems, the embodiments of the present application provide a battery pack housing and a battery pack.

[0035] Figure 1 This is a schematic structural diagram of an embodiment of the battery pack housing provided by the embodiment of the present application. Figure 2 This is an exploded structural diagram of an embodiment of the battery pack housing provided by the embodiment of the present application. As Figure 1 and Figure 2 shown, the battery pack housing 100 includes two housing components 110 and a second liquid cooling plate 120. The housing component 110 includes a first side plate 111 and a first liquid cooling plate 112 that are integrally connected. Thus, the housing component 110 can be formed by extrusion molding of profiles. Specifically, the housing component 110 can be formed by extruding a profile with a cavity through a profile die. The material of the profile can be aluminum or other metals, which is not limited here.

[0036] Among them, the first side plates 111 of the two housing components 110 are relatively spaced apart along the first direction X, and an installation space 1001 for installing electric cores (not shown in the figure) is formed. A first liquid cooling channel 1120 is provided in the first liquid cooling plate 112 of the housing component 110. The two first liquid cooling plates 112 are located on the same side of the installation space 1001 along the second direction Y. The second direction Y is set at an angle to the first direction X. The angle formed by the first direction X and the second direction Y can be a right angle or an acute angle, which can be specifically determined according to the structure of the electromagnetic package housing.

[0037] In addition, the second liquid cooling plate 120 is welded between the two first liquid cooling plates 112. One side plate surface of the second liquid cooling plate 120 faces the installation space 1001. A second liquid cooling channel 121 communicating with the first liquid cooling channel 1120 is provided in the second liquid cooling plate 120, so that the second liquid cooling plate 120 and the two first liquid cooling plates 112 are located on the same side of the installation space 1001, and one side plate surface of the second liquid cooling plate 120 and the two first liquid cooling plates 112 faces the installation space 1001 respectively, so that the first liquid cooling plate 112 and the second liquid cooling plate 120 can dissipate heat from the electric cores in the installation space 1001.

[0038] In the embodiments of the present application, by welding the second liquid cooling plate 120 between the first liquid cooling plates 112 of the two box body components 110, one side plate surface of the second liquid cooling plate 120 faces the installation space 1001 between the first side plates 111 of the two box body components 110, and the second liquid cooling channels 121 of the second liquid cooling plate 120 are communicated with the first liquid cooling channels 1120 of the first liquid cooling plates 112, it is possible to combine the first liquid cooling plates 112 of the two box body components 110 and the second liquid cooling plate 120 to form a liquid cooling plate structure with a wider width. Moreover, since the second liquid cooling plate 120 is welded between the two first liquid cooling plates 112, without changing the overall width of the liquid cooling plate structure along the first direction X, the width of the first liquid cooling plate 112 along the first direction X can be reduced, thereby reducing the width of the profile for forming the box body component 110 by extrusion molding, which is beneficial to reducing the difficulty and cost of extrusion molding of the profile, improving the flatness of the first liquid cooling plate 112 and the side plate formed by extrusion of the profile, and thus improving the qualification rate of the overall liquid cooling plate formed by welding the first liquid cooling plate 112 and the second liquid cooling plate 120.

[0039] In some embodiments, as Figure 4 and Figure 5 shown, a first communication hole 1124 communicated with the first liquid cooling channel 1120 may be provided on the side of the first liquid cooling plate 112 facing the second liquid cooling plate 120, and second communication holes 1214 communicated with the second liquid cooling channels 121 may be respectively provided on both sides of the second liquid cooling plate 120 along the first direction X. When the two first liquid cooling plates 112 are respectively welded to the second liquid cooling plate 120, the first communication holes 1124 of the two first liquid cooling plates 112 are in one-to-one correspondence and communication with the two second communication holes 1214, so that the first liquid cooling channels 1120 of the two first liquid cooling plates 112 are respectively communicated with the second liquid cooling channels 121.

[0040] Thus, when welding the first liquid cooling plate 112 to the second liquid cooling plate 120, the first communication hole 1124 of the first liquid cooling plate 112 can be aligned with the corresponding second communication hole 1214 on the second liquid cooling plate 120, and the communication between the first liquid cooling channel 1120 of the first liquid cooling plate 112 and the second liquid cooling channel 121 can be realized, and the operation is very convenient, which is beneficial to improving the processing efficiency of the battery pack box body 100.

[0041] Among them, the first communication hole 1124 of the first liquid cooling plate 112 may be located at one end of the first liquid cooling plate 112 along the third direction Z, and the first direction X and the second direction Y are respectively set at an angle with the third direction Z. Correspondingly, the second communication hole 1214 of the second liquid cooling plate 120 is located at one end of the second liquid cooling plate 120 along the third direction Z, so that the first communication hole 1124 of the first liquid cooling plate 112 can be aligned and communicated with the corresponding second communication hole 1214 on the second liquid cooling plate 120.

[0042] Of course, the first communication hole 1124 of the first liquid cooling plate 112 can also be located in the middle of the first liquid cooling plate 112 along the third direction Z, or the first communication hole 1124 of the first liquid cooling plate 112 can be kept at a certain distance from the end of the first liquid cooling plate 112 along the third direction Z. Correspondingly, the second communication hole 1214 of the second liquid cooling plate 120 is located in the middle of the second liquid cooling plate 120 along the third direction Z, or the second communication hole 1214 of the second liquid cooling plate 120 is kept at a certain distance from the end of the second liquid cooling plate 120 along the third direction Z. It only needs to ensure that the first communication hole 1124 of the first liquid cooling plate 112 can be aligned and communicated with the corresponding second communication hole 1214 on the second liquid cooling plate 120.

[0043] In some embodiments, as Figure 4 and Figure 5 shown, the first liquid cooling channel 1120 of the first liquid cooling plate 112 can include a plurality of first sub-channels 1121. The plurality of first sub-channels 1121 are sequentially distributed along the first direction X, and the plurality of first sub-channels 1121 respectively extend along the third direction Z. The first direction X and the second direction Y are respectively arranged at an angle with the third direction Z. Thereby, the distribution of the first liquid cooling channel 1120 in the first liquid cooling plate 112 can be made more uniform, which is beneficial to improving the heat dissipation uniformity of each part of the first liquid cooling plate 112.

[0044] Among them, at least one first sub-channel 1121 is communicated with the first communication hole 1124, so that the first liquid cooling channel 1120 is communicated with the first communication hole 1124. In some embodiments, the first sub-channel 1121 close to the second liquid cooling plate 120 among the plurality of first sub-channels 1121 can be communicated with the first communication hole 1124, that is, the first communication hole 1124 is communicated with the nearest first sub-channel 1121, so that the structure of the first liquid cooling channel 1120 of the first liquid cooling plate 112 is simpler and the processing is more convenient.

[0045] Continuing to refer to Figure 4 and Figure 5 , the second liquid cooling channel 121 can include a plurality of second sub-channels 1211. The plurality of second sub-channels 1211 are sequentially distributed along the second direction Y, and the plurality of second sub-channels 1211 respectively extend along the third direction Z. The first direction X and the second direction Y are respectively arranged at an angle with the third direction Z. Thereby, the distribution of the second liquid cooling channel 121 in the second liquid cooling plate 120 can be made more uniform, which is beneficial to improving the heat dissipation uniformity of each part of the second liquid cooling plate 120.

[0046] Among them, at least one second sub-channel 1211 communicates with the first liquid cooling channel 1120, so that the first liquid cooling channel 1120 communicates with the second liquid cooling channel 121. In some embodiments, two second sub-channels 1211 located on both sides of the second liquid cooling plate 120 along the first direction X can be made to communicate with two second communication holes 1214 one by one, that is, the second communication hole 1214 communicates with the nearest second sub-channel 1211, so that the structure of the second liquid cooling channel 121 of the second liquid cooling plate 120 is simpler and the processing is more convenient.

[0047] As Figure 4 shown, at least one end of the first liquid cooling plate 112 along the third direction Z is provided with a first opening 1122 communicating with a plurality of first sub-channels 1121, and the first direction X and the second direction Y are respectively arranged at an angle with the third direction Z. At the same end of the second liquid cooling plate 120 along the third direction Z, a second opening 1212 communicating with a plurality of second sub-channels 1211 is provided, that is, the first opening 1122 and the second opening 1212 are located on the same side of the battery pack housing 100 along the third direction Z.

[0048] In some embodiments, as Figure 3 and Figure 4 shown, a first notch 1123 can be provided on the side of the first opening 1122 of the first liquid cooling plate 112 close to the second liquid cooling plate 120, and a second notch 1213 can be provided on at least one side of the second opening 1212 of the second liquid cooling plate 120 close to the first liquid cooling plate 112, so that when the first liquid cooling plate 112 and the second liquid cooling plate 120 are welded and connected, the first notch 1123 and the second notch 1213 can be aligned and communicated.

[0049] Among them, the battery pack housing 100 further includes a seal 130 connected to the first liquid cooling plate 112 and the second liquid cooling plate 120. The seal 130 seals the first opening 1122 and the second opening 1212, so as to prevent the coolant in the first liquid cooling channel 1120 and the second liquid cooling channel 121 from leaking out from the first opening 1122 or the second opening 1212. Moreover, the seal 130 and the first notch 1123 enclose a first communication hole 1124, and the seal 130 and the second notch 1213 enclose a second communication hole 1214. By the way that the seal 130 and the first notch 1123 enclose the first communication hole 1124 and enclose the second communication hole 1214 with the second notch 1213, the processing of the first communication hole 1124 and the second communication hole 1214 can be made more convenient, which is beneficial to improving the processing efficiency of the battery pack housing 100.

[0050] In some embodiments, at both ends of the first liquid cooling plate 112 along the third direction Z, first openings 1122 communicating with a plurality of first sub-channels 1121 are provided. At both ends of the second liquid cooling plate 120 along the third direction Z, second openings 1212 communicating with a plurality of second sub-channels 1211 are respectively provided. The battery pack housing 100 includes two seals 130 connected to the first liquid cooling plate 112 and the second liquid cooling plate 120. One of the seals 130 seals the first opening 1122 and the second opening 1212 at one end of the first liquid cooling plate 112 and the second liquid cooling plate 120 along the third direction Z, and the other seal 130 seals the first opening 1122 and the second opening 1212 at the other end of the first liquid cooling plate 112 and the second liquid cooling plate 120 along the third direction Z.

[0051] In some embodiments, in the first direction X, a plurality of first sub-channels 1121 can be connected in series in sequence. That is, the plurality of first sub-channels 1121 of the first liquid cooling plate 112 are connected in series in sequence in the direction away from the second liquid cooling plate 120. Among them, in three adjacent first sub-channels 1121, the middle first sub-channel 1121 is connected to one end of the first sub-channel 1121 close to the second liquid cooling plate 120 along the third direction Z, and the other end of the middle first sub-channel 1121 along the third direction Z is connected to the other end of the first sub-channel 1121 away from the second liquid cooling plate 120 along the third direction Z, so that the plurality of first sub-channels 1121 are connected in series in sequence along the first direction X.

[0052] Among them, the first liquid cooling plate 112 can include a first partition 1125 located between two adjacent first sub-channels 1121. One end of the first partition 1125 along the third direction Z has a first gap 1126 with the seal 130, and the first sub-channels 1121 on both sides of the first partition 1125 are connected through the first gap 1126, so that one end of two adjacent first sub-channels 1121 along the third direction Z is connected.

[0053] Specifically, the number of the first partitions 1125 is multiple, and the multiple first partitions 1125 and the multiple first sub-channels 1121 are alternately distributed along the first direction X. In the direction of the first liquid cooling plate 112 away from the second liquid cooling plate 120, among the multiple first partitions 1125 of the first liquid cooling plate 112, the first partitions 1125 arranged in odd positions have a first gap 1126 with one of the seals 130, and the first partitions 1125 arranged in even positions are in contact with the seal 130. At the same time, the first partitions 1125 arranged in odd positions are in contact with the other seal 130, and the first partitions 1125 arranged in even positions have a first gap 1126 with the seal 130, so that the plurality of first sub-channels 1121 are connected in series in sequence along the first direction X.

[0054] In some embodiments, in the first direction X, a plurality of second sub-channel 1211 can be connected in series in sequence. Among them, in three adjacent second sub-channel 1211 of the second liquid cooling plate 120, the middle second sub-channel 1211 is connected to one end of the second sub-channel 1211 on one side along the third direction Z, and the other end of the middle second sub-channel 1211 along the third direction Z is connected to one end of the second sub-channel 1211 on the other side along the third direction Z.

[0055] Among them, the second liquid cooling plate 120 can include a second partition 1215 located between two adjacent second sub-channel 1211. One end of the second partition 1215 along the third direction Z has a second gap 1216 with the seal 130, and the second sub-channel 1211 on both sides of the second partition 1215 are connected through the second gap 1216, so that one end of two adjacent second sub-channel 1211 along the third direction Z is connected.

[0056] Specifically, the number of the second partitions 1215 is multiple, and the multiple second partitions 1215 and the multiple second sub-channel 1211 are alternately distributed along the first direction X. In the direction of the second liquid cooling plate 120 away from one of the first liquid cooling plates 112, among the multiple second partitions 1215 of the second liquid cooling plate 120, the second partitions 1215 arranged in odd positions have a second gap 1216 with one of the seals 130, and the second partitions 1215 arranged in even positions are in contact with the seal 130. At the same time, the second partitions 1215 arranged in odd positions are in contact with the other seal 130, and the second partitions 1215 arranged in even positions have a second gap 1216 with the seal 130, so that a plurality of second sub-channel 1211 are connected in series in sequence along the first direction X.

[0057] It should be noted that the first liquid cooling channels 1120 of the first liquid cooling plate 112 and the second liquid cooling channels 121 of the second liquid cooling plate 120 can be arranged according to the above embodiments, or only one of the first liquid cooling channels 1120 of the first liquid cooling plate 112 and the second liquid cooling channels 121 of the second liquid cooling plate 120 can be arranged according to the above embodiments, and the other can adopt other structures. For example: the multiple first sub-channel 1121 of the first liquid cooling channel 1120 or the multiple second sub-channel 1211 of the second liquid cooling channel 121 can also be arranged in parallel.

[0058] In some embodiments, such as Figure 5As shown, the ratio of the sum of the widths W1 of the two first liquid cooling plates 112 in the first direction X to the width W2 of the second liquid cooling plate 120 in the first direction X can be greater than or equal to 20% and less than or equal to 50%, that is, 20% ≤ 2W1 / W2 ≤ 50%. Thus, the sum of the widths of the first liquid cooling plate 112 and the first side plate 111 of the first box body component 110, and the width design of the second liquid cooling plate 120 are more reasonable. While increasing the overall width of the liquid cooling plate, the width of the profile for extruding the box body component 110 is moderate.

[0059] Among them, the ratio of the sum of the widths W1 of the two first liquid cooling plates 112 in the first direction X to the width W2 of the second liquid cooling plate 120 in the first direction X can be 25%, 30%, 40%, etc., which can be specifically determined according to the size of the battery pack box 100 and is not limited here.

[0060] In some embodiments, as Figure 1 and Figure 2 shown, the battery pack box 100 further includes two second side plates 140 arranged oppositely. The two second side plates 140 are distributed on both sides of the installation space 1001 along the third direction Z. The first side plate 111, the first liquid cooling plate 112, and the second liquid cooling plate 120 are respectively connected to the second side plate 140, thereby further improving the structural stability of the battery pack box 100.

[0061] Among them, the second side plate 140 and the first side plate 111, the first liquid cooling plate 112, and the second liquid cooling plate 120 can be connected by welding, screw connection, etc., and are not limited here.

[0062] In some embodiments, as Figure 1 and Figure 2 shown, the two first liquid cooling plates 112 respectively include mounting plates 1127. The mounting plates 1127 of the two first liquid cooling plates 112 are located on the side of the same second side plate 140 facing away from the installation space. A liquid inlet joint 151 is installed on one mounting plate 1127, and a liquid outlet joint 152 is installed on the other mounting plate 1127. The liquid inlet joint 151 of the mounting plate 1127 of one first liquid cooling plate 112 is communicated with the first liquid cooling channel 1120 of this first liquid cooling plate 112, and the liquid outlet joint 152 of the mounting plate 1127 of the other first liquid cooling plate 112 is communicated with the first liquid cooling channel 1120 of this other first liquid cooling plate 112. By connecting the liquid inlet joint 151 with the outlet of the coolant supply device (not shown in the figure) and connecting the liquid outlet joint 152 with the inlet of the coolant supply device, the coolant supply device can continuously circulate and supply coolant to the first liquid cooling channel 1120 of the first liquid cooling plate 112 and the second liquid cooling channel 121 of the second liquid cooling plate 120.

[0063] Among them, one side of the mounting plate 1127 facing the second side plate 140 has a mounting surface 1128. A liquid inlet joint 151 communicating with the corresponding first liquid cooling channel 1120 can be provided on the mounting surface 1128 of one of the mounting plates 1127, and a liquid outlet joint 152 communicating with the corresponding first liquid cooling channel 1120 can be provided on the mounting surface 1128 of the other mounting plate 1127, so as to facilitate the connection of the liquid inlet joint 151 and the liquid outlet joint 152 with a coolant supply device.

[0064] It should be noted that the connection of the liquid inlet joint 151 or the liquid outlet joint 152 with the corresponding first liquid cooling channel 1120 means that: the liquid inlet joint 151 provided on the mounting plate 1127 of one of the first liquid cooling plates 112 is connected to the first liquid cooling channel 1120 in this one of the first liquid cooling plates 112, and the liquid outlet joint 152 provided on the mounting plate 1127 of the other first liquid cooling plate 112 is connected to the first liquid cooling channel 1120 in the other first liquid cooling plate 112.

[0065] Specifically, the first liquid cooling channel 1120 in the first liquid cooling plate 112 extends to the mounting plate 1127. A mounting opening communicating with the first liquid cooling channel 1120 is formed on the mounting surface 1128 of the mounting plate 1127. The liquid inlet joint 151 or the liquid outlet joint 152 is fixedly installed on the mounting surface 1128 of the corresponding mounting plate 1127 and communicates with the mounting opening on the mounting surface 1128, so that the liquid inlet joint 151 or the liquid outlet joint 152 is connected to the first liquid cooling channel 1120 of the corresponding first liquid cooling plate 112.

[0066] In some embodiments, such as Figure 1 and Figure 2 shown, the first liquid cooling plate 112 can be made into a flat plate structure, so as to facilitate better contact between the first liquid cooling plate 112 and the battery cells in the installation space 1001 and improve the heat dissipation effect on the battery cells. At the same time, it can also make the setting of the first liquid cooling channel 1120 in the first liquid cooling plate 112 more convenient, which is beneficial to improving the production efficiency of the first liquid cooling plate 112.

[0067] Similarly, the second liquid cooling plate 120 can be made into a flat plate structure, so as to facilitate better contact between the second liquid cooling plate 120 and the battery cells in the installation space 1001 and improve the heat dissipation effect on the battery cells. At the same time, it can also make the setting of the second liquid cooling channel 121 in the second liquid cooling plate 120 more convenient, which is beneficial to improving the production efficiency of the second liquid cooling plate 120.

[0068] It should be noted that both the first liquid cooling plate 112 and the second liquid cooling plate 120 can be made into flat plate structures, or only one of the first liquid cooling plate 112 and the second liquid cooling plate 120 can be made into a flat plate structure, which can be specifically determined according to the structure of the battery pack and is not limited here.

[0069] The embodiments of the present application further provide a battery pack, which includes a battery pack housing. The specific structure of the battery pack housing may refer to the above embodiments. Since this battery pack adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0070] Among them, the battery pack includes a battery pack housing 100 and battery cells, and the battery cells are installed in the installation space 1001 of the battery pack housing 100. The structure of the battery pack housing may refer to any of the above embodiments. The battery pack provided by the embodiments of the present application can be used in vehicles, energy storage systems, etc., which will not be elaborated here.

[0071] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A battery pack box, characterized in that: include: Two box components, the box components include a first side plate and a first liquid cooling plate that are integrally connected, the two first side plates are arranged relatively spaced along a first direction and form an installation space for installing a battery cell, a first liquid cooling channel is provided in the first liquid cooling plate, the two first liquid cooling plates are located on the same side of the installation space along a second direction, and the second direction is arranged at an angle to the first direction; The second liquid cooling plate is welded between the two first liquid cooling plates, one side surface of the second liquid cooling plate faces the installation space, and the second liquid cooling plate is provided with a second liquid cooling channel connected with the first liquid cooling channel.

2. The battery pack box according to claim 1, characterized in that: A first connecting hole connected to the first liquid cooling channel is formed on one side of the first liquid cooling plate facing the second liquid cooling plate, and second connecting holes connected to the second liquid cooling channel are formed on both sides of the second liquid cooling plate along the first direction, and the first connecting holes of the two first liquid cooling plates are connected to the two second connecting holes in a one-to-one correspondence, so that the first liquid cooling channels of the two first liquid cooling plates are connected to the second liquid cooling channels respectively.

3. The battery pack box according to claim 2, characterized in that: The first connecting hole is located at one end of the first liquid cooling plate along the third direction, and the first direction and the second direction are respectively arranged to form an angle with the third direction.

4. The battery pack box according to claim 2, characterized in that: The first liquid cooling channel includes a plurality of first sub-channels, the plurality of first sub-channels are sequentially distributed along the first direction, and the plurality of first sub-channels extend along a third direction respectively, the first sub-channel close to the second liquid cooling plate is connected to the first connecting hole, and the first direction and the second direction are respectively arranged at an angle to the third direction; and / or, The second liquid cooling channel includes a plurality of second sub-channels, which are distributed in sequence along the second direction and extend along the third direction respectively. Two second sub-channels located on both sides of the second liquid cooling plate along the first direction are connected to two second connecting holes in a one-to-one correspondence, and the first direction and the second direction are respectively arranged at an angle to the third direction.

5. The battery pack case according to claim 4, characterized in that: A first opening communicating with the plurality of first sub-channels is formed at at least one end of the first liquid cooling plate along the third direction, and a first notch is formed at a side of the first opening close to the second liquid cooling plate; a second opening communicating with the plurality of second sub-channels is formed at the same end of the second liquid cooling plate along the third direction, and a second notch is formed at at least one side of the second opening close to the first liquid cooling plate; The battery pack case also includes a seal connected to the first liquid cooling plate and the second liquid cooling plate, the seal seals the first opening and the second opening, the seal and the first notch form the first connecting hole, and the seal and the second notch form the second connecting hole.

6. The battery pack case according to claim 5, characterized in that: The first liquid cooling plate comprises a first partition plate located between two adjacent first sub-channels, one end of the first partition plate along the third direction has a first gap with the sealing member, and the first sub-channels on both sides of the first partition plate are connected through the first gap; and / or, The second liquid cooling plate further includes a second partition plate located between two adjacent second sub-channels, a second gap is provided between the second partition plate and the sealing member, and the second sub-channels on both sides of the second partition plate are connected through the second gap.

7. The battery pack case according to any one of claims 1 to 6, characterized in that: A ratio of a sum of widths of the two first liquid cooling plates in the first direction to a width of the second liquid cooling plate in the first direction is greater than or equal to 20% and less than or equal to 50%.

8. The battery pack case according to any one of claims 1 to 6, characterized in that: The battery pack case also includes two second side panels arranged opposite to each other, and the two second side panels are distributed on both sides of the installation space along a third direction. The first side panel, the first liquid cooling plate and the second liquid cooling plate are respectively connected to the second side panels, and the first direction and the second direction are respectively arranged at an angle to the third direction.

9. The battery pack case according to claim 8, characterized in that: The two first liquid cooling plates respectively include mounting plates, and the two mounting plates are located on the side of the same second side plate facing away from the mounting space, and the mounting plate has a mounting surface on the side facing the second side plate, wherein the mounting surface of one of the mounting plates is provided with a liquid inlet joint connected to the corresponding first liquid cooling channel, and the mounting surface of the other mounting plate is provided with a liquid outlet joint connected to the corresponding first liquid cooling channel.

10. The battery pack case according to any one of claims 1 to 6, characterized in that: The first liquid cooling plate is a flat plate structure; and / or the second liquid cooling plate is a flat plate structure.

11. A battery pack, characterized in that: include: A battery pack case, wherein the battery pack case is the battery pack case according to any one of claims 1 to 10; The battery cell is installed in the installation space of the battery pack box.

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