An immersed battery pack and an electric device

Abstract

This utility model provides an immersion battery pack and an electrical device. The immersion battery pack includes a housing, a cooling assembly, and a battery body. The housing encloses a first space. The cooling assembly includes multiple first cooling plates and multiple second cooling plates. The battery body includes multiple battery strings, each containing multiple battery cells. The first cooling plates are arranged parallel to each other and spaced apart. The second cooling plates are arranged parallel to each other and spaced apart within the intervals between adjacent first cooling plates. Adjacent first and second cooling plates enclose a third space for accommodating the battery cells. A first flow channel is provided inside each first cooling plate. A second flow channel is formed between the second cooling plate and the sidewall of an adjacent battery cell. The first and second flow channels communicate with each other, and the second flow channel communicates with the first space within the housing. The immersion battery pack provided by this utility model solves the problems of difficult instantaneous and uniform heat dissipation in related technologies.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an immersion battery pack and electrical equipment. Background Technology

[0002] With the development of battery technology, the integration scale and charging and discharging capacity of battery packs are constantly improving; battery packs generate Joule heat continuously during operation, which in turn increases the requirements for heat dissipation performance.

[0003] Cold plate liquid cooling is a commonly used heat dissipation method in related technologies. The cold plate is bonded to the heat-generating components in the battery pack with thermally conductive adhesive, so that the heat from the heat-generating components is conducted to the cold plate, and then the heat is carried away by the coolant flowing in the cold plate, thus achieving heat dissipation of the battery pack.

[0004] However, in cold plate liquid cooling, heat transfer through thermally conductive adhesive has a long heat transfer path, making it difficult to dissipate heat in a timely manner; the cold plate can only indirectly contact part of the surface of the heat-generating component through the thermally conductive adhesive, which cannot achieve uniform heat dissipation of the heat-generating component. Utility Model Content

[0005] This invention provides an immersion battery pack and electrical equipment to solve the problem of difficulty in instant and uniform heat dissipation in related technologies.

[0006] To solve the above problems, this utility model is achieved through the following technical solution:

[0007] The first aspect of this utility model provides an immersion battery pack, including a housing, a cooling assembly, and a battery body;

[0008] The housing encloses a first space, and the cooling assembly and the battery body are disposed in the first space;

[0009] The cooling assembly includes multiple first cooling plates and multiple second cooling plates; the battery body includes multiple battery strings arranged parallel to each other and electrically connected along a first direction, and each battery string includes multiple battery cells arranged parallel to each other and electrically connected along a second direction.

[0010] The first cooling plate is arranged parallel to and spaced apart along the first direction; the second cooling plate is arranged parallel to and spaced apart within the interval between two adjacent first cooling plates along the second direction; each pair of adjacent first cooling plates and each pair of adjacent second cooling plates enclose a third space for accommodating a battery cell.

[0011] Each of the first cooling plates has a first flow channel inside; a second cooling plate is attached to the side wall of an adjacent cell to form a second flow channel; the first flow channel is connected to the second flow channel, and the second flow channel is connected to a first space inside the housing; coolant flows through the first flow channel, the second flow channel and the first space.

[0012] Optionally, the interior of the housing is provided with a third flow channel and a fourth flow channel; one end of the third flow channel is a liquid inlet, and the other end is connected to the first flow channel; one end of the fourth flow channel is a liquid outlet, and the other end is connected to the first space.

[0013] Optionally, the first cooling plate includes a plurality of first ports; the first ports are spaced apart on the sidewall of the first cooling plate for use in...

[0014] The first flow channel and the second flow channel are connected; the second cooling plate in the battery string whose first port is attached to the first cooling plate corresponds one-to-one.

[0015] Optionally, the first cooling plate has a first wall and a second wall disposed opposite to each other, the interior of the first cooling plate is a hollow cavity, the hollow cavity is provided with a first partition and a second partition, the length of the first partition and the second partition is less than the length of the first wall and the length of the second wall;

[0016] The first flow channel includes a first sub-flow channel and a second sub-flow channel; the first partition, the second partition, and the first wall form a U-shaped first sub-flow channel; the second partition and the second wall form a straight second sub-flow channel; one end of the first sub-flow channel is connected to the second sub-flow channel; the first port is spaced along the second sub-flow channel.

[0017] Optionally, the first cooling plate further includes a second port, which is the other end of the first sub-channel; the first channel is connected to the third channel through the second port, and a seal is provided at the connection position between the second port and the third channel.

[0018] Optionally, the second cooling plate includes a third partition and a connecting portion; the third partition is spaced apart along the length direction of the connecting portion; the third partitions on two opposite connecting portions of the second cooling plate are staggered and spaced apart, and are attached to the side wall of the battery cell to form the second flow channel.

[0019] Optionally, the second cooling plate forms a third port and a fourth port with the sidewall of the adjacent battery cell through the third partition and the connecting part, the second flow channel communicates with the first flow channel through the third port, and the second flow channel communicates with the first space through the fourth port.

[0020] Optionally, the housing includes a frame and two oppositely arranged cover plates; the battery body and the cooling assembly are disposed within the first space enclosed by the frame and the cover plates; a fifth flow channel is provided inside the cover plates, and the fifth flow channel communicates with the first space.

[0021] Optionally, the frame includes multiple side beams connected end to end, and the side beams are provided with a third flow channel for introducing the coolant into the first space and a fourth flow channel for leading the coolant out of the first space.

[0022] Optionally, a U-shaped beam is also provided on the outer side of the side beam. The U-shaped beam, the side beam, and the cover plate enclose a second space, which is used to place the control device of the immersion battery pack.

[0023] Optionally, at least one of the third flow channel and the fourth flow channel is connected to the second space.

[0024] The second aspect of this utility model provides an electrical device, the electrical device including an immersion battery pack as described in any of the first aspects above.

[0025] Compared with the prior art, the embodiments of this utility model have the following advantages:

[0026] In this embodiment of the invention, the battery body and the cooling assembly are disposed in a first space enclosed by a housing. The battery body includes multiple battery strings, and each battery string includes multiple independent cells. The cooling assembly includes a first cooling plate and a second cooling plate. The first cooling plate is attached between adjacent battery strings and has a first flow channel. The second cooling plate is disposed between adjacent cells in each battery string and is attached to the sidewall of the cell to form a second flow channel. Adjacent first and second cooling plates form a third space for accommodating the cells. The first flow channel, the second flow channel, and the first space are sequentially connected, and the coolant flows in the connected space. The coolant in the second flow channel and the first space directly contacts the cells, immersing them and achieving instant heat exchange between the cells and the coolant. The first and second cooling plates separate the cells, allowing the coolant to uniformly exchange heat with each surface of a single cell, thus improving the heat exchange efficiency between the cells and the coolant.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the immersion battery pack provided in this embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the battery body of the immersion battery pack provided in this embodiment of the utility model;

[0030] Figure 3 This is an embodiment of the present utility model. Figure 1 Enlarged view of region A in the middle;

[0031] Figure 4 This is a schematic diagram of the structure of the first cooling plate provided in this embodiment of the utility model;

[0032] Figure 5 This is a cross-sectional view of the first cooling plate provided in this embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the second cooling plate provided in this embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the housing of the immersion battery pack provided in this embodiment of the utility model;

[0035] Figure 8 This is a schematic diagram of the frame structure of the immersion battery pack provided in this embodiment of the present invention;

[0036] Figure 9 This is an embodiment of the present utility model. Figure 8 A magnified view of region B in the middle.

[0037] in:

[0038] 1. Casing; 2. Cooling assembly; 3. Battery body; 4. First space; 5. Second space; 6. Third space; 11. Frame; 12. Cover plate; 111. Third flow channel; 112. Fourth flow channel; 113. Side beam; 114. Z-shaped beam; 1111. Fifth port; 1121. Sixth port; 21. First cooling plate; 211. First flow channel; 212. First port; 213. Second port; 214. First partition; 215. Second partition; 216. First wall; 217. Second wall; 22. Second cooling plate; 221. Second flow channel; 222. Third partition; 223. Connecting part; 224. Third port; 225. Fourth port; 31. Battery string; 311. Battery cell. Detailed Implementation

[0039] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The first aspect of this utility model proposes an immersion battery pack, in conjunction with reference to [reference needed]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ,in, Figure 1 This is a schematic diagram of the structure of the immersion battery pack provided in this embodiment of the present invention. Figure 2 This is a schematic diagram of the battery body of the immersion battery pack provided in this embodiment of the utility model. Figure 3 This is an embodiment of the present utility model. Figure 1 Enlarged diagram of region A in the middle. Figure 4 This is a schematic diagram of the structure of the first cooling plate provided in this embodiment of the utility model. Figure 5 This is a cross-sectional view of the first cooling plate provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the structure of the second cooling plate provided in this embodiment of the present invention; the submersible battery pack includes a shell 1, a cooling assembly 2, and a battery body 3; the shell 1 encloses a first space 4, and the cooling assembly 2 and the battery body 3 are disposed in the first space 4; the battery body 3 includes a plurality of battery strings 31 arranged parallel to and electrically connected along a first direction X, and the battery strings 31 include a plurality of battery cells 311 arranged parallel to and electrically connected along a second direction Y; the first direction X and the second direction Y are perpendicular; the first cooling plates 21 are arranged parallel to and spaced apart along the first direction X; the second cooling plates 22 are arranged parallel to and spaced apart along the second direction Y within the interval between two adjacent first cooling plates 21; each two adjacent first cooling plates 21 are arranged parallel to and spaced apart along the second direction Y. The first cooling plate 21 and two adjacent second cooling plates 22 enclose a third space 6 for accommodating a battery cell 311. The first cooling plate 21 is attached between adjacent battery strings 31, and a first flow channel 211 is provided inside each first cooling plate 21. A second cooling plate 22 is disposed between adjacent battery cells 311 in each battery string 31, and the second cooling plate 22 is attached to the side wall of the adjacent battery cell 311 to form a second flow channel 221. The first flow channel 211 and the second flow channel 221 are connected, and the second flow channel 221 is connected to the first space 4 inside the housing 1. Coolant flows in the first flow channel 211, the second flow channel 221 and the first space 4.

[0041] In this embodiment of the invention, the housing 1 encloses a first space 4, and the battery body 3 and the cooling assembly 2 are simultaneously disposed within the first space 4. The battery body 3 includes multiple battery strings 31 arranged parallel to each other along a first direction X, and each battery string 31 is composed of multiple cells 311 arranged along a second direction Y. The first direction X and the second direction Y can be arranged perpendicularly, so that the cells in the battery body are distributed in a matrix. The first cooling plate 21 in the cooling assembly 2 is arranged parallel to each other along the first direction X between adjacent battery strings 31 to separate the battery strings 31. The first cooling plate 21 is provided with a first flow channel 211, and the coolant flows in the first flow channel 211 of the first cooling plate 21 to realize heat exchange between the contact surfaces of the battery strings 31 and the first cooling plate 21. At the same time, the second cooling plate 22 in the cooling assembly 2 is arranged along the second direction Y between adjacent cells 311 in the interval between two adjacent first cooling plates 21. The battery cells 311 in the battery string 31 are separated and independent. A third space 6 is formed by each pair of adjacent first cooling plates 21 and two adjacent second cooling plates 22, which can accommodate one battery cell 311. The second cooling plate 22 is attached to the side wall of the adjacent battery cell 311 to form a second flow channel 221. The coolant flows in the second flow channel 221 and comes into direct contact with the side wall of the battery cell 311, realizing heat exchange between the side wall of the battery cell 311 and the second cooling plate 22. The remaining part of the first space 4 (i.e., the part of the first space 4 excluding the cooling assembly 2 and the battery body 3) is connected to the second flow channel 221. The remaining part of the first space 4 also has coolant flowing in it, which comes into contact with the remaining surface of the battery cell 311 (i.e., the surface of the battery cell 311 that does not come into contact with the first cooling plate 21 or the second cooling plate 22), so that the battery cell 311 is immersed in the coolant, realizing heat exchange between the surface of the battery cell 311 and the coolant. The first flow channel 211, the second flow channel 221, and the first space 4 are connected in sequence, so that the coolant can circulate inside the housing 1, realizing the circulation of the coolant inside the housing 1 and ensuring that the coolant continuously removes the heat from the battery cell 311.

[0042] The embodiments of this utility model do not limit the flow direction of the coolant. For example, the coolant can flow from the first flow channel 211 into the second flow channel 221 and then into the first space 4, or the coolant can flow from the first space 4 into the second flow channel 221 and then into the first flow channel 211.

[0043] Reference Figure 3 ,exist Figure 3In the illustrated embodiment, the assembly of the cooling component 2 (i.e., the first cooling plate 21 and the second cooling plate 22) can be completed first, and then the battery cell 311 can be placed into the space formed by the adjacent two first cooling plates 21 and the adjacent two second cooling plates 22 in sequence. Then, the battery body 3 and the cooling component 2 can be placed into the first space 4 to complete the assembly of the immersion battery pack provided by this utility model embodiment. It can be understood that the second cooling plate 22 located at both ends of the first cooling plate 21 is attached to the shell 1 on one side and to the battery cell 311 on the other side, and both sides can form the second flow channel 221.

[0044] In some other embodiments not shown, the first cooling plate 21 is integrally formed with the housing 1. In this case, the battery cell 311 and the second cooling plate 22 can be pre-assembled, that is, the battery cell 311 is pre-assembled into a battery string 31 with the second cooling plate 22, and then the pre-assembled battery string 31 is placed between the first cooling plates 21 to complete the assembly of the immersion battery pack provided by this utility model embodiment. Similarly, the second cooling plate 22 located at both ends of the first cooling plate 21 is attached to the housing 1 on one side and to the battery cell 311 on the other side, and both sides can form a second flow channel 221.

[0045] For example, by opening ports and flow channels in the housing 1, coolant from the external liquid supply system can flow into the first space 4 and coolant in the first space 4 can flow out, thereby completing the circulation of coolant relative to the entire submerged battery pack.

[0046] This embodiment of the invention separates the battery cells 311 using a first cooling plate 21 and a second cooling plate 22, ensuring that the heat dissipation area and heat dissipation time of each battery cell 311 are consistent, thus avoiding temperature gradient differences within the battery body 3. Furthermore, by restricting the flow direction and trend of the coolant within the submerged battery pack, the contact area and contact time between the coolant and the battery cells 311 are increased, thereby improving heat exchange efficiency. In addition, the first cooling plate 21 and the second cooling plate 22 can form a support frame for the battery body 3, thereby improving the structural strength of the battery body 3. Moreover, since the battery cells 311 are separated, thermal runaway is less likely to spread in the event of thermal runaway in a single battery cell 311, thus ensuring the safety and reliability of the submerged battery pack.

[0047] In this embodiment of the invention, the battery body and the cooling assembly are disposed in a first space enclosed by a housing. The battery body includes multiple battery strings, and each battery string includes multiple independent cells. The cooling assembly includes a first cooling plate and a second cooling plate. The first cooling plate is attached to adjacent battery strings and has a first flow channel. The second cooling plate is disposed between adjacent cells in each battery string and is attached to the sidewall of the cell to form a second flow channel. Adjacent first and second cooling plates form a third space for accommodating the cells. The first flow channel, the second flow channel, and the first space are sequentially connected, and the coolant flows in the connected space. The coolant in the second flow channel and the first space directly contacts the cells, immersing them and achieving instant heat exchange between the cells and the coolant. At the same time, the first and second cooling plates separate the sides of the cells, allowing the coolant to uniformly exchange heat with each surface of a single cell, thus improving the heat exchange efficiency between the cells and the coolant.

[0048] Optional, in conjunction with reference Figure 7 , Figure 8 and Figure 9 ,in, Figure 7 This is a schematic diagram of the structure of the housing of the immersion battery pack provided in this embodiment of the utility model. Figure 8 This is a schematic diagram of the frame structure of the immersion battery pack provided in this embodiment of the present invention. Figure 9 This is an embodiment of the present utility model. Figure 8 Enlarged schematic diagram of region B; the interior of the shell 1 is provided with a third flow channel 111 and a fourth flow channel 112; one end of the third flow channel 111 is a liquid inlet and the other end is connected to the first flow channel 211; one end of the fourth flow channel 112 is a liquid outlet and the other end is connected to the first space 4.

[0049] In this embodiment of the present invention, the housing 1 itself may be a hollow structure, and a third flow channel 111 and a fourth flow channel 112 are provided inside the housing 1; one end of the third flow channel 111 is a liquid inlet, and the other end (the fifth port 1111) is connected to the first flow channel 211; the first end of the fourth flow channel 112 is a liquid outlet, and the other end (the sixth port 1121) is connected to the first space 4; the liquid inlet and liquid outlet are used to connect to an external liquid supply system to realize the circulation of coolant in the immersion battery pack; it should be noted that the liquid inlet and liquid outlet are only used to distinguish the end of the third flow channel 111 that is not connected to the first flow channel 211 and the end of the fourth flow channel 112 that is not connected to the first space 4. In this embodiment of the present invention, the flow direction of the coolant is not limited, so the functions of the liquid inlet of the third flow channel 111 and the liquid outlet of the fourth flow channel 112 can be reversed after the coolant flow direction is reversed, that is, at this time, the liquid inlet performs the liquid outlet function, and the liquid outlet performs the liquid inlet function.

[0050] When there are multiple first cooling plates 21, there will be multiple first flow channels 211 in the submerged battery pack. Therefore, there can be multiple fifth ports 1111 of the third flow channel 111. After the coolant enters the first space 4 through the second flow channel 221, it can flow out through the sixth port 1121 of the fourth flow channel 112. The sixth port 1121 can also be set to multiple, so as to improve the flow efficiency of the coolant between the fourth flow channel 112 and the first space 4, thereby improving the heat exchange efficiency of the submerged battery pack.

[0051] Optional, refer to Figure 4 The first cooling plate 21 includes a plurality of first ports 212; the first ports 212 are spaced apart on the side wall of the first cooling plate 21 for connecting the first flow channel 211 and the second flow channel 221; the first ports 212 correspond one-to-one with the second cooling plates 22 in the battery string 31 that are attached to the first cooling plate 21.

[0052] A first port 212 is provided on the side wall (the side that is attached to the battery string 31) of the first cooling plate 21. The position of the first port 212 corresponds one-to-one with the position of the second cooling plate 22 in the battery string 31 to which the first cooling plate 21 is attached, so as to connect the first flow channel 211 and the second flow channel 221, so that the first flow channel 211 can be connected to multiple second flow channels 221 at the same time.

[0053] In some embodiments of the present invention, the first flow channel 211 in a first cooling plate 21 may be connected only to the second flow channel 221 in the battery string 31 on one side of the first cooling plate 21 (i.e., the first cooling plate 21 has a first port 212 on only one side). In other embodiments of the present invention, the first flow channel 211 in a first cooling plate 21 may be connected simultaneously to the second flow channel 221 in the battery string 31 on both sides of the first cooling plate 21 (i.e., the first port 212 is provided on both opposite sides of the first cooling plate 21).

[0054] The first port 212 can be configured as a circular through hole, a rectangular through hole, or a trapezoidal through hole, etc. This embodiment of the utility model does not limit the shape of the first port 212.

[0055] Optional, refer to Figure 5 The first cooling plate 21 has a first wall 216 and a second wall 217 arranged opposite to each other. The interior of the first cooling plate 21 is a hollow cavity. The hollow cavity is provided with a first partition 214 and a second partition 215. The lengths of the first partition 214 and the second partition 215 are less than the lengths of the first wall 216 and the second wall 217. The first flow channel 211 includes a first sub-flow channel and a second sub-flow channel. The first partition 214, the second partition 215 and the first wall 216 form a U-shaped first sub-flow channel. The second partition 215 and the second wall 217 form a straight second sub-flow channel. One end of the first sub-flow channel is connected to the second sub-flow channel. The first port 212 is arranged at intervals along the second sub-flow channel.

[0056] In the first cooling plate 21, besides the sidewall with the first port 212, the first cooling plate 21 also has a first wall 216 and a second wall 217. The first wall 216 and the second wall 217 have the same length. The first wall 216, the second wall 217, and the sidewall constitute a hollow cavity of the first cooling plate 21. A first partition 214 and a second partition 215 are disposed inside the hollow cavity. The first partition 214 and the second partition 215 can be arranged in a direction parallel to the direction of the first wall 216 (or the second wall 217). In this case, the length of the first partition 214 and the second partition 215 is less than the length of the first wall 216 and the length of the second wall 217. The first partition 214 is adjacent to one end of the first cooling plate 21. A gap is formed, so that the first partition 214, the second partition 215, and the first wall 216 form a U-shaped first sub-channel. That is, under the action of the first partition 214, the first channel 211 undergoes a first fold in the first cooling plate 21. The second partition 215 and the second wall 217 form a straight second sub-channel. The second partition 215 and the other end of the first cooling plate 21 form another gap, so that one end of the first sub-channel is connected to the second sub-channel. That is, under the action of the second partition 215, the first channel 211 undergoes a second fold in the first cooling plate 21. The first sub-channel and the second sub-channel constitute the first port 212 of the first channel 211 in the first cooling plate 21, which is spaced apart along the second sub-channel.

[0057] The coolant can flow into the first cooling plate 21 from the end of the first sub-channel away from the second sub-channel, and after flowing through the first and second sub-channels, it can flow out from the first port 212. Alternatively, it can flow into the first cooling plate 21 from the first port 212, flow into the first sub-channel from the second sub-channel, and then flow out from the end of the first sub-channel away from the second sub-channel.

[0058] By using the first partition 214 and the second partition 215 to fold the first flow channel 211 within the first cooling plate 21, the residence time of the coolant in the first cooling plate 21 can be extended, that is, the heat exchange time between the coolant and the battery string 31 can be extended, thereby improving the temperature uniformity of each cell 311 in contact with the first cooling plate 21 and improving the heat dissipation effect of the first cooling plate 21.

[0059] Optional, refer to Figure 3 , Figure 4 and Figure 9 The first cooling plate 21 also includes a second port 213, which is the other end of the first sub-channel; the first channel 211 is connected to the third channel 111 through the second port 213, and a seal is provided at the connection position between the second port 213 and the third channel 111 (not shown in the figure).

[0060] exist Figure 3 , Figure 4 as well as Figure 9 In the embodiment shown, the first cooling plate 21 is a straight pipe structure independent of the housing 1; the other end of the first sub-channel away from the second sub-channel is the second port 213, through which the first channel 211 is connected to the third channel 111 inside the housing 1; at this time, the connection position between the second port 213 and the third channel 111 (i.e. the fifth port 1111) can be sealed by a sealing element (not shown in the figure).

[0061] The seal can be an elastic structure with a through hole. When the first cooling plate 21 is installed on the housing 1, one end of the through hole of the seal can be aligned with the fifth port 1111 and the seal can be compressed at the same time. Then, the second port 213 of the first cooling plate 21 is aligned with the other end of the through hole of the seal and placed into the first space 4. The first cooling plate 21 and the housing 1 simultaneously squeeze the seal from both ends, so that the seal seals the connection between the second port 213 and the fifth port 1111.

[0062] Optionally, the first cooling plate 21 is integrally formed with the housing 1.

[0063] In embodiments not shown in this utility model, the first cooling plate 21 is integrally formed with the shell 1. In this case, the first cooling plate 21 can serve as a crossbeam or longitudinal beam of the first space 4 inside the shell 1, that is, as part of the shell 1 to divide the first space 4; the first flow channel 211 and the third flow channel 111 are connected as one unit and are no longer connected through the second port 213 and the fifth port 1111.

[0064] By integrally molding the first cooling plate 21 and the housing 1, the number of parts in the submerged battery pack can be reduced, and the assembly process of the submerged battery pack can be simplified. At this time, the housing 1 of the submerged battery pack is supported by the first cooling plate 21, and the structural strength is improved.

[0065] Optional, refer to Figure 6 The second cooling plate 22 includes a third partition 222 and a connecting portion 223; the third partition 222 is spaced apart along the length direction of the connecting portion 223; the third partitions 222 on two opposite connecting portions 223 in the second cooling plate 22 are staggered and spaced apart, and are attached to the side wall of the cell 311 to form a second flow channel 221.

[0066] The second cooling plate 22 includes two parallel connecting portions 223. A third partition 222 is arranged parallel to each other along the length of the connecting portions 223. The third partitions 222 on the two parallel connecting portions 223 are staggered, so that the third partitions 222 and the connecting portions 223 enclose a second flow channel 221. When the second cooling plate is attached to the side of the cell 311, the coolant can flow in the second flow channel 221 and directly contact the side wall of the cell 311 to dissipate heat from the cell 311. There can be multiple third partitions 222, so that the second flow channel 221 can be folded multiple times, so that the projection of the second flow channel 221 on the side wall of the cell 311 occupies as much position as possible on the side wall of the cell 311, increasing the contact area between the second flow channel 221 and the cell 311, increasing the residence time of the coolant in the second cooling plate 22, and improving the heat dissipation effect of the second cooling plate 22.

[0067] The projected area of ​​the second cooling plate 22 on the side wall of the cell 311 can cover the entire side wall of the cell 311, but the projected area of ​​the second flow channel 221 on the side wall of the cell 311 is smaller than the side wall area of ​​the cell 311.

[0068] For example, the third partition 222 can be a prism structure, in which case the cross section of the third partition 222 is rectangular; the side wall of the battery cell 311 is flat, and the side wall of the prism is also flat, thereby maximizing the fit with the side wall of the battery cell 311, thereby improving the sealing effect of the second flow channel 221.

[0069] Optional, refer to Figure 6 The second cooling plate 22 forms a third port 224 and a fourth port 225 with the side wall of the adjacent battery cell 311 through the third partition 222 and the connecting part 223. The second flow channel 221 is connected to the first flow channel 211 through the third port 224 and the second flow channel 221 is connected to the first space 4 through the fourth port 225.

[0070] In the second cooling plate 22, one end of one of the connecting parts 223 in the length direction converges towards the third partition 222 to form a third port 224 with the third partition 222 located at the same end of the other connecting part 223. The third port 224 is used to connect the second flow channel 221 and the first flow channel 211. The third port 224 can be funnel-shaped. That is, when the side wall of the cell 311 is attached to the second cooling plate 22, the third port 224 can be trapezoidal when viewed from the side wall of the cell 311 towards the second cooling plate 22. It can be understood that in the funnel-shaped third port 224, the large opening of the funnel faces the first port 212 in the first cooling plate 21.

[0071] In the second cooling plate 22, a shorter and opposite third partition 222 is provided on the other end of the two connecting parts 223 along the length direction to form a fourth port 225. The fourth port 225 is used to connect the second flow channel 221 with the first space 4 (the remaining part of the first space 4). When the battery cell 311 is installed between the adjacent second cooling plates 22, the fourth port 225 of the battery cell 311 is flush with the surface of the battery cell 311 on which the electrode post is installed, so that the coolant can immerse the battery cell 311 after entering the first space 4.

[0072] The coolant can flow from the first port 212 of the first cooling plate 21 into the third port 224, and then discharge through the fourth outlet along the configuration of the second flow channel 221. Alternatively, the coolant can flow from the first space 4 into the fourth port 225, and then flow into the first cooling plate 21 from the third port 224 along the configuration of the second flow channel 221. During the flow of the coolant through the second flow channel 221, it continuously contacts the side of the battery cell 311, exchanging heat with the battery cell 311 to ensure the consistency of heat dissipation at various locations on the sidewall of the battery cell 311.

[0073] Since the second cooling plate 22 physically separates the cells 311 in the battery string 31, it can achieve isolation between the cells 311, preventing the spread of thermal runaway when a single cell 311 is damaged. At the same time, the second cooling plate 22 is attached to the side wall of the cell 311, so that the second cooling plate 22 can support the single cell 311, thereby improving the overall structural strength of the submerged battery pack.

[0074] Optional, refer to Figure 7 The housing 1 includes a frame 11 and two cover plates 12 arranged opposite to each other; the battery body 3 and the cooling assembly 2 are disposed in the first space 4 enclosed by the frame 11 and the cover plates 12; a fifth flow channel is provided inside the cover plate 12, and the fifth flow channel is connected to the first space 4.

[0075] The housing 1 of the submersible battery pack may include a frame 11 and cover plates 12 disposed opposite to each other on both sides of the frame 11. After the cover plates 12 are closed, the frame 11 and the cover plates 12 enclose a first space 4. The frame 11 may be configured as a hollow structure, that is, a third flow channel 111 or a fourth flow channel 112 may be disposed in the frame 11.

[0076] In some embodiments of this utility model, the cover plate 12 can also be configured as a hollow structure. In this case, a fifth flow channel is provided in the cover plate 12, which is connected to the first space 4 and can be used as a replacement for the fourth flow channel 112. That is, the coolant flows into the cover plate 12 through one end of the fifth flow channel, and then exits the cover plate 12 through the other end of the fifth flow channel and enters the first space 4. Then it flows through the second flow channel 221, the first flow channel 211 and the third flow channel 111 in sequence, and flows out of the submerged battery pack.

[0077] Since the cover plate 12 is more regular in shape and has a larger surface area than the frame 11, it is easier to process. Replacing the fourth flow channel 112 with the fifth flow channel can reduce the design and production difficulty of the hollow structure inside the frame 11. At the same time, it avoids the heat exchange that occurs when the inlet and outlet flow channels are close to each other, which would affect the temperature of the coolant and thus the heat dissipation efficiency.

[0078] Optional, in conjunction with reference Figure 7 , Figure 8 and Figure 9 The frame 11 includes multiple side beams 113 connected end to end. The side beams 113 are provided with a third flow channel 111 for introducing coolant into the first space 4 and a fourth flow channel 112 for leading coolant out of the first space 4.

[0079] The frame 11 includes multiple end-to-end connected edge beams 113, in conjunction with reference to... Figure 1 and Figure 2 When the battery body 3 is cube-shaped, there can be four side beams 113, and the shape formed after enclosure is rectangular, so that the first space 4 is cube-shaped, thus matching the shape of the battery body 3; at this time, the first cooling plate 21 can be assembled between two opposite side beams 113 to form the crossbeam or longitudinal beam of the frame 11, which plays a supporting role for the side beams 113.

[0080] The third flow channel 111 and the fourth flow channel 112 can be disposed within the side beam 113. It should be noted that the functional limitations on the third flow channel 111 and the fourth flow channel 112 are only for distinguishing between them. In this embodiment of the invention, the flow direction of the coolant is not restricted; the coolant can flow sequentially from the third flow channel 111 through the first flow channel 211 (the third flow channel 111 can be connected to the first flow channel 211 through the fifth port 1111 disposed on the side beam 113), and the second flow channel 212. 21. The first space 4 and the four channels can also flow sequentially from the fourth channel 112 through the first space 4 (the fourth channel 112 can be connected to the first space 4 through the sixth port 1121 set on the side beam 113), the second channel 221, the first channel 211 and the third channel 111; the introduction of coolant into the third channel 111 of the first space 4 here means that the coolant can flow sequentially through the third channel 111, the first channel 211 and the second channel 221, and finally reach the remaining part of the first space 4.

[0081] The inlet of the third flow channel 111 and the outlet of the fourth flow channel 112 can be located on the same side beam 113 or on different side beams 113. When located on the same side beam 113, the coolant exchange path can be shortened, and the rate of coolant heat exchange can be increased. When located on different side beams 113, heat exchange between the third flow channel 111 and the fourth flow channel 112 due to their close proximity can be avoided, which would affect the coolant temperature and thus the heat dissipation efficiency.

[0082] Optional, in conjunction with reference Figure 7 , Figure 8 and Figure 9 A U-shaped beam 114 is also provided on the outside of the side beam 113. The U-shaped beam 114, the side beam 113 and the cover plate 12 enclose a second space 5, which is used to place the control device of the submersible battery pack.

[0083] A U-shaped beam 114 can also be provided on the outer side of the side beam 113 relative to the first space 4. The U-shaped beam 114, the side beam 113 and the cover plate 12 enclose the second space 5. The second space 5 can be used to place the control devices of the submerged battery pack, such as various monitoring modules (such as current monitoring, voltage monitoring and temperature monitoring) and circuit protection devices (such as fuses, relays, overvoltage / undervoltage protection circuits and overcurrent protection circuits) in the battery management system (BMS).

[0084] The Z-beam 114 creates a second space 5 for placing control devices in the submersible battery pack, thus isolating the battery body 3 and some control devices and facilitating the maintenance of the submersible battery pack. In addition, the Z-beam 114 makes the cross-section of the second space 5 trapezoidal, which can improve the structural stability of the frame 11.

[0085] Optionally, at least one of the third flow channel 111 and the fourth flow channel 112 is connected to the second space 5.

[0086] Since most of the control devices are heat-generating components, the second space 5 can be submerged in coolant to dissipate heat from the control devices. The first space 4 and the second space 5 can be connected through the third flow channel 111 or the fourth flow channel 112. That is, the inlet in the third flow channel 111 or the outlet in the fourth flow channel 112 is set in the side beam 113 corresponding to the Z-beam 114 and faces the second space 5 to realize the circulation of coolant in the first space 4 and the second space 5. At this time, additional inlet and outlet flow channels can be opened on the Z-beam 114, or, based on the fifth flow channel opened on the cover plate 12, a sixth flow channel can be opened on the cover plate 12. The fifth and sixth flow channels connect the first space 4 and the second space 5 respectively. The third flow channel 111 or the fourth flow channel 112 is only used to realize the connection between the first space 4 and the second space 5, so as to realize the flow of coolant into and out of the submerged battery pack.

[0087] By connecting the first space 4 and the second space 5 through the third flow channel 111 or the fourth flow channel 112, the coolant can be used to dissipate heat from the control devices in the second space 5, ensuring the overall heat dissipation effect of the submerged battery pack.

[0088] In this embodiment of the invention, the battery body and the cooling assembly are disposed within a first space enclosed by a housing. The battery body includes multiple battery strings, each battery string including multiple independent cells. The cooling assembly includes a first cooling plate and a second cooling plate. The first cooling plate is fitted between adjacent battery strings and has a first flow channel. The second cooling plate is disposed between adjacent cells in each battery string and is fitted to the sidewall of the cell, forming a second flow channel. Adjacent first and second cooling plates form a third space for accommodating the cells. The first flow channel, the second flow channel, and the first space are sequentially connected, and coolant flows within the connected space. In this embodiment of the invention, the coolant in the second flow channel and the first space directly contacts the cells, achieving immersion of the cells and thus achieving proper contact between the cells and the coolant. Instant heat exchange, with the first and second cooling plates separating the sides of the battery cells, allows the coolant to exchange heat evenly with each surface of an individual cell, improving the heat exchange efficiency between the cell and the coolant. The separation of the cells by the first and second cooling plates ensures consistent heat dissipation area and time for each cell, preventing temperature gradient differences within the battery pack. Furthermore, by restricting the flow direction and tendency of the coolant within the submerged battery pack, the contact area and contact time between the coolant and the cells are increased, further enhancing heat exchange efficiency. In addition, the first and second cooling plates form a supporting frame for the battery pack, thereby improving its structural strength. Moreover, due to the separation of the cells, thermal runaway in an individual cell is less likely to propagate, ensuring the safety and reliability of the submerged battery pack.

[0089] The present invention provides an electrical device in a second aspect, the electrical device including an immersion battery pack as described in any of the first aspects above.

[0090] Electrical equipment can include electric vehicles (such as commercial electric vehicles and electric racing cars), energy storage systems (such as backup power supplies for base stations), and special industrial equipment (such as AGVs and mining machinery).

[0091] The beneficial effects of the electrical equipment are the same as or similar to those of the immersion battery pack described in the first aspect above, and will not be repeated here.

[0092] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0093] The present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A submersible battery pack, characterized in that, Includes the casing, cooling components, and battery body; The housing encloses a first space, and the cooling assembly and the battery body are disposed in the first space; The cooling assembly includes multiple first cooling plates and multiple second cooling plates; the battery body includes multiple battery strings arranged parallel to each other and electrically connected along a first direction, and each battery string includes multiple battery cells arranged parallel to each other and electrically connected along a second direction; the first direction and the second direction are perpendicular. The first cooling plate is arranged parallel to and spaced apart along the first direction; the second cooling plate is arranged parallel to and spaced apart within the interval between two adjacent first cooling plates along the second direction; each pair of adjacent first cooling plates and each pair of adjacent second cooling plates enclose a third space for accommodating a battery cell. Each of the first cooling plates has a first flow channel inside; a second cooling plate is attached to the side wall of an adjacent cell to form a second flow channel; the first flow channel is connected to the second flow channel, and the second flow channel is connected to a first space inside the housing; coolant flows through the first flow channel, the second flow channel and the first space.

2. The immersion battery pack according to claim 1, characterized in that, The shell is provided with a third flow channel and a fourth flow channel inside; one end of the third flow channel is a liquid inlet and the other end is connected to the first flow channel; one end of the fourth flow channel is a liquid outlet and the other end is connected to the first space.

3. The immersion battery pack according to claim 2, characterized in that, The first cooling plate includes a plurality of first ports; the first ports are spaced apart on the side wall of the first cooling plate and are used to connect the first flow channel and the second flow channel; the first ports are in contact with the first cooling plate and the plurality of second cooling plates in the battery string are in one-to-one correspondence.

4. The immersion battery pack according to claim 3, characterized in that, The first cooling plate has a first wall and a second wall disposed opposite to each other. The interior of the first cooling plate is a hollow cavity. The hollow cavity is provided with a first partition and a second partition. The lengths of the first partition and the second partition are less than the lengths of the first wall and the second wall. The first flow channel includes a first sub-flow channel and a second sub-flow channel; the first partition, the second partition, and the first wall form a U-shaped first sub-flow channel; the second partition and the second wall form a straight second sub-flow channel; one end of the first sub-flow channel is connected to the second sub-flow channel; the first port is spaced along the second sub-flow channel.

5. The immersion battery pack according to claim 4, characterized in that, The first cooling plate also includes a second port, which is the other end of the first sub-channel; the first channel is connected to the third channel through the second port, and a seal is provided at the connection position between the second port and the third channel.

6. The immersion battery pack according to claim 1, characterized in that, The second cooling plate includes a third partition and a connecting portion; the third partition is spaced apart along the length of the connecting portion; the third partitions on two opposite connecting portions of the second cooling plate are staggered and spaced apart, and are attached to the side wall of the battery cell to form the second flow channel.

7. The immersion battery pack according to claim 6, characterized in that, The second cooling plate forms a third port and a fourth port with the sidewall of the adjacent battery cell through the third partition and the connecting part. The second flow channel communicates with the first flow channel through the third port and with the first space through the fourth port.

8. The immersion battery pack according to claim 1, characterized in that, The housing includes a frame and two cover plates disposed opposite each other; the battery body and the cooling assembly are disposed within the first space enclosed by the frame and the cover plates; a fifth flow channel is provided inside the cover plate, and the fifth flow channel communicates with the first space.

9. The immersion battery pack according to claim 8, characterized in that, The frame includes multiple side beams connected end to end. The side beams are provided with a third flow channel for introducing the coolant into the first space and a fourth flow channel for leading the coolant out of the first space.

10. The immersion battery pack according to claim 9, characterized in that, A U-shaped beam is also provided on the outer side of the side beam. The U-shaped beam, the side beam, and the cover plate enclose a second space, which is used to place the control device of the immersion battery pack.

11. The immersion battery pack according to claim 10, characterized in that, At least one of the third flow channel and the fourth flow channel is connected to the second space.

12. An electrical appliance, characterized in that, The electrical equipment includes an immersion battery pack as described in any one of claims 1 to 11.

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