Battery packs and electrical equipment

Abstract

The present application discloses a battery pack and an electrical device, belonging to the field of battery technology. The battery pack is provided with a first flow channel plate, the first flow channel plate is provided with a liquid inlet flow channel, a plurality of first branch flow channels and a plurality of second branch flow channels, the liquid inlet on the first wall is connected with the first branch flow channel, the liquid inlet port of the first liquid cooling plate is arranged opposite to the liquid inlet, the liquid inlet flow channel is connected with the adjacent first branch flow channel, two adjacent first branch flow channels are connected through the second branch flow channel, the number of the second branch flow channels between two adjacent first branch flow channels decreases from one end close to the liquid inlet flow channel to the end far from the liquid inlet flow channel, the heat transfer fluid entering the first branch flow channel is shunted and divided in pressure through the second branch flow channel, so that the first liquid cooling plates at different positions have similar regulating effects on the temperature of the battery cells abutting thereto, the temperature uniformity of the battery cells at different positions is good, and the safe use of the battery pack is ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] In the battery pack, a heat-conducting fluid is introduced into the liquid cooling plate, and heat is exchanged between the heat-conducting fluid and the battery cells to adjust and control the temperature of the battery cells. However, the pressure distribution of the heat-conducting fluid introduced into the liquid cooling plate is uneven. The pressure of the fluid near the liquid inlet port is relatively large, while the pressure of the fluid far from the liquid inlet port is relatively small. As a result, the liquid cooling plate far from the liquid inlet port has a poor temperature regulation effect on the battery cells, and the temperature uniformity of the battery cells at different positions is poor, affecting the safe use of the battery pack. Summary of the invention

[0003] The purpose of the present application is to provide a battery pack and an electrical device to solve the problem of poor temperature uniformity of battery cells caused by poor pressure uniformity of heat transfer fluid inside liquid cooling plates at different positions in the current battery pack.

[0004] A first aspect of an embodiment of the present application provides a battery pack, wherein the battery pack has a first direction, a second direction and a third direction intersecting in pairs, and the battery pack comprises: a box body, wherein a accommodating cavity is provided inside the box body, wherein the box body comprises a first wall and a second wall arranged opposite to each other along the third direction, and a liquid inlet is provided at one end of the first wall along the second direction; a battery cell is arranged in the accommodating cavity; a first liquid cooling plate is arranged in the accommodating cavity and abuts against the battery cell along the first direction, a first flow channel for heat transfer fluid to flow is provided inside the first liquid cooling plate, and a liquid inlet port connected to the first flow channel is provided on a side of the first liquid cooling plate facing the first wall along the third direction, and the liquid inlet port is connected to the The liquid inlet is arranged relatively to each other; the first flow channel plate is arranged on a side of the first wall facing away from the second wall, and the first flow channel plate is provided with a liquid inlet channel, a plurality of first branch channels and a plurality of second branch channels on the side facing the first wall, and the liquid inlet is connected with the first branch channel; along the first direction, a plurality of the first branch channels are arranged at intervals, the liquid inlet channel is connected with the adjacent first branch channels, the second branch channel is arranged between two adjacent first branch channels, and the two adjacent first branch channels are connected through the second branch channel, and the number of the second branch channels between two adjacent first branch channels decreases from one end close to the liquid inlet channel to the end away from the liquid inlet channel.

[0005] Optionally, the first flow channel plate includes a plurality of first filling parts; along the first direction, the plurality of first filling parts are arranged at intervals, at least one first filling part is arranged between two adjacent first branch flow channels, and a first filling cavity for accommodating fillers is arranged inside the first filling part; the first filling part has a dimension S mm along the second direction, and along the first direction, the dimension S of the plurality of first filling parts increases from one end close to the liquid inlet flow channel to one end away from the liquid inlet flow channel.

[0006] Optionally, the first flow channel plate also includes a second filling section; the second filling section is arranged between two adjacent first branch channels along the first direction, and a second filling cavity for accommodating fillers is provided inside the second filling section; along the second direction, the second branch channel is defined between the first filling section and the adjacent second filling section, and the second branch channel is defined between two adjacent second filling sections; along the first direction, the number of the second filling sections between two adjacent first branch channels decreases from one end close to the liquid inlet channel to the end away from the liquid inlet channel.

[0007] Optionally, a liquid outlet is provided at one end of the first wall away from the liquid inlet along the second direction; a liquid outlet channel is provided on the side of the first channel plate toward the first wall along the third direction, and the liquid outlet is connected to the liquid outlet channel; along the second direction, the liquid inlet channel and the liquid outlet channel are spaced apart, and the first branch channel and the liquid outlet channel are spaced apart.

[0008] Optionally, the battery pack also includes a second flow channel plate and a second liquid cooling plate; the second flow channel plate is arranged on a side of the first wall facing the second wall, and a second flow channel for flow of a heat-conducting fluid is provided on a side of the second flow channel plate facing the second wall, and the battery cell and the first liquid cooling plate are both arranged on the second flow channel plate; the second liquid cooling plate is arranged on the second flow channel plate, and includes a first single plate abutting against the battery cell along the second direction, and a third flow channel for flow of a heat-conducting fluid is provided inside the first single plate, the liquid inlet end of the third flow channel is arranged opposite to the liquid inlet and can be connected to the liquid inlet, and the liquid outlet end is connected to the second flow channel.

[0009] The coordinated design of the second flow channel plate and the second liquid cooling plate allows the heat-conducting fluid in the first branch flow channel to enter the first single plate of the second liquid cooling plate to regulate the temperature of the side of the battery cell along the second direction, and allows the heat-conducting fluid entering the first single plate to enter the second flow channel of the second flow channel plate. The heat-conducting fluid entering the second flow channel can regulate the temperature of a side of the battery cell adjacent to the first wall along the third direction, thereby improving the temperature regulation effect on the battery cell and improving the safety of the battery cell.

[0010] Optionally, the battery pack also includes a valve body; the valve body is inserted into the liquid inlet port to block the liquid inlet and the first flow channel, and the valve body and the first single plate are arranged along the first direction to block the liquid inlet and the liquid inlet end of the third flow channel; when the pressure applied to the valve body reaches a preset first pressure threshold, the liquid inlet and the first flow channel can be connected, and when the pressure applied to the valve body reaches a preset second pressure threshold, the liquid inlet and the liquid inlet end of the third flow channel can be connected, and the first pressure threshold is less than the second pressure threshold.

[0011] The setting of the valve body can ensure that the fluid pressure of the heat-conducting fluid in the first branch flow channel only enters the first flow channel of the first liquid cooling plate at the first pressure threshold, thereby regulating the temperature of the battery cell and improving the temperature control efficiency of the battery cell. At the second pressure threshold, the heat-conducting fluid in the first branch flow channel can enter the first flow channel and the third flow channel of the first single plate at the same time. The third flow channel can form a diversion for the heat-conducting fluid with higher fluid pressure, and can regulate the temperature of the side of the battery cell along the second direction, thereby improving the temperature control efficiency, and can avoid damage to the first liquid cooling plate caused by excessive fluid pressure in the first flow channel, thereby increasing the service life of the first liquid cooling plate and improving the temperature control effect on the battery cell.

[0012] Optionally, the valve body includes a first main body and a baffle; the first main body is inserted into the liquid inlet port, a flow guide cavity is provided inside the first main body and passes through the first main body along the third direction, and a flow guide port connected to the flow guide cavity is opened on one side of the first main body facing the first single plate along the first direction; the baffle is arranged in the flow guide cavity, and the baffle includes a first blocking portion and a second blocking portion connected along the third direction, the first blocking portion can block the flow guide cavity to block the liquid inlet and the first flow channel, and the second blocking portion can block the flow guide port to block the liquid inlet and the liquid inlet end of the third flow channel; the baffle can reciprocate along the third direction in the flow guide cavity, and when the pressure on the first blocking portion reaches the first pressure threshold, the liquid inlet and the first flow channel can be connected; when the pressure on the first blocking portion reaches the second pressure threshold, the liquid inlet and the first flow channel can be connected, and the second blocking portion can be driven to expose at least part of the flow guide port to connect the liquid inlet and the liquid inlet end of the third flow channel.

[0013] Optionally, the valve body also includes a first elastic member; along the third direction, one end of the first blocking portion facing away from the second flow channel plate is recessed to form a recessed portion, and one end of the first main body facing away from the second flow channel plate is connected to a limiting portion; the first blocking portion can move along the third direction away from the first wall, so that the limiting portion is embedded in the recessed portion; the first elastic member is arranged in the recessed portion, one end of the first elastic member along the third direction abuts against the limiting portion, and the other end abuts against the recessed portion; the first blocking portion moves away from the second flow channel plate along the third direction, and the recess squeezes the first elastic member.

[0014] Optionally, the valve body further includes a guide column, one end of which along the third direction is connected to the recessed portion, and the other end of which is inserted into the limiting portion, and the first elastic member is sleeved on the guide column.

[0015] Optionally, a liquid outlet is provided at one end of the first wall along the second direction away from the liquid inlet, and along the third direction, the liquid inlet is connected to the first branch channel, and the liquid outlet is connected to the liquid outlet channel; along the third direction, a liquid outlet port connected to the first channel is provided on a side of the first liquid cooling plate facing the first wall, and the liquid outlet port is arranged opposite to the liquid outlet.

[0016] Optionally, the second liquid cooling plate also includes a second single plate. Along the second direction, the second single plate is arranged opposite to the first single plate and respectively abuts against the battery cells. A fourth flow channel for the flow of heat-conducting fluid is provided inside the second single plate. The liquid inlet end of the fourth flow channel is connected to the second flow channel, and the liquid outlet end is connected to the liquid outlet.

[0017] Optionally, the second liquid cooling plate also includes a third single board; along the second direction, a plurality of the battery cells are arranged between the first single board and the second single board, and one third single board is arranged between two adjacent battery cells; a fifth flow channel for the flow of heat-conducting fluid is provided inside the third single board, and the liquid inlet and liquid outlet of the fifth flow channel are respectively connected to the second flow channel.

[0018] Optionally, the battery cell includes a first surface and a second surface arranged opposite to each other along the first direction, a third surface and a fourth surface arranged opposite to each other along the second direction, and a fifth surface and a sixth surface arranged opposite to each other along the third direction, the first surface, the third surface, the second surface and the fourth surface are sequentially connected end to end to form a shell structure with two open ends, the fifth surface and the sixth surface respectively cover the two open ends, and the first surface and the second surface are surfaces with the largest surface areas; along the first direction, the second liquid cooling plate abuts against the first surface or the second surface; along the second direction, the first single board abuts against the third surface of the adjacent battery cell, and the second single board abuts against the fourth surface of the adjacent battery cell, and of the two adjacent battery cells, the third surface of one battery cell and the fourth surface of the other battery cell abut against the third single board respectively; along the third direction, the fifth surface of the battery cell can be in direct contact with the heat transfer fluid in the second flow channel.

[0019] Optionally, along the third direction, the opposite ends of the first single plate are bent respectively to form a first bending portion, the liquid inlet end and the liquid outlet end of the third flow channel are respectively opened on the first bending portion adjacent to the second flow channel plate, one first bending portion abuts against the fifth surface of the battery cell, and the other first bending portion abuts against the sixth surface; along the third direction, the opposite ends of the second single plate are bent respectively to form a second bending portion, the liquid inlet end and the liquid outlet end of the fourth flow channel are respectively opened on the second bending portion adjacent to the second flow channel plate, one second bending portion abuts against the fifth surface of the battery cell, and the other second bending portion abuts against the sixth surface of the adjacent battery cell; along the third direction, one end of the third single plate is provided with a supporting portion, and the other end is provided with a covering portion, the liquid inlet end and the liquid outlet end of the fifth flow channel are respectively opened on the supporting portion, the supporting portion abuts against the fifth surface of the adjacent battery cell, and the covering portion abuts against the sixth surface of the adjacent battery cell.

[0020] Optionally, the first liquid cooling plate includes a plurality of connectors, and includes a first sub-board, a second sub-board and a plurality of sub-boards, the first sub-board and the second sub-board are respectively provided with sub-channels for the flow of heat-conducting fluid, along the second direction, the first sub-board and the second sub-board are connected, and the sub-channels are connected to form the first channel; the first sub-board is inserted into the liquid inlet through the connector to connect the first channel with the first branch channel, and the second sub-board is inserted into the liquid outlet through the connector to connect the first channel with the liquid outlet channel; the connector is detachably connected to the first wall, and the first sub-board and the second sub-board are detachably connected.

[0021] The detachable connection between the first liquid cooling plate and the first wall can improve the convenience of subsequent care and maintenance of the battery pack, and can improve the convenience of disassembly and assembly of the first liquid cooling plate, facilitate the subsequent maintenance and recycling of the first liquid cooling plate, and reduce manufacturing costs.

[0022] Optionally, the connector includes a plug-in portion, wherein a first accommodating cavity is provided inside the plug-in portion and passes through the plug-in portion along the third direction; the plug-in portion includes a first plug-in portion and a second plug-in portion, wherein the first accommodating cavity is provided inside the first plug-in portion and the second plug-in portion, respectively; along the third direction, the liquid inlet port is opened on a side of the first sub-board facing the first wall, one end of the first plug-in portion is inserted in the liquid inlet port, and the other end is inserted in the liquid inlet port, and the first plug-in portion is detachably connected to the first wall; along the third direction, the liquid outlet port is opened on a side of the second sub-board facing the first wall, one end of the second plug-in portion is inserted in the liquid outlet port, and the other end is inserted in the liquid outlet port, and the second plug-in portion is detachably connected to the first wall; the valve body is arranged in the first accommodating cavity of the first plug-in portion, and along the first direction, a diversion opening is opened on a side of the first plug-in portion facing the first single board, which is connected to the first accommodating cavity and connected to the diversion port.

[0023] Optionally, the connector also includes a connecting portion and a connecting rod; along the second direction, a connecting portion is respectively provided on the outer sides of the opposite ends of the first liquid cooling plate, and the connecting portion is connected to the adjacent plug-in portion through the connecting rod; the connecting portion can drive the connected plug-in portion to move along the third direction through the connecting rod, so that the plug-in portion is separated from the first wall.

[0024] Optionally, the first liquid cooling plate is provided with first through holes connected to the first flow channel at two opposite ends along the second direction, the connecting rod is inserted into the first through hole and can move in the first through hole along the third direction; a shielding portion is provided on one side of the plug-in portion adjacent to the connecting portion along the second direction, and the shielding portion extends along the third direction and shields the first through hole.

[0025] Optionally, the first liquid cooling plate also includes a second elastic member; the first liquid cooling plate is respectively provided with a crimping portion at two opposite ends along the second direction, and the crimping portion is provided with a first slot on a side facing the first wall along the third direction; along the third direction, the connecting portion is inserted into the first slot, and a second accommodating cavity penetrating the connecting portion is provided inside the connecting portion, the connecting portion passes through the second flow channel plate, and a receiving portion is connected to one end of the connecting portion adjacent to the first wall, the receiving portion abuts against the first wall, the second elastic member is arranged in the second accommodating cavity, one end of the second elastic member is inserted into the first slot, and the other end abuts against the receiving portion; along the third direction, the connecting portion can move in the first slot and squeeze the second elastic member through the receiving portion to drive the crimping portion away from the first wall.

[0026] Optionally, the first liquid cooling plate also includes a second elastic member and a support member; the first liquid cooling plate is respectively provided with a crimping portion at two opposite ends along the second direction, and the crimping portion is provided with a first slot on a side facing the first wall along the third direction; along the third direction, the connecting portion is inserted into the first slot, and a second accommodating cavity penetrating the connecting portion is provided inside the connecting portion, the support member passes through the second flow channel plate and is arranged on the first wall, the connecting portion is arranged on a side of the support member facing away from the first wall, the second elastic member is arranged in the second accommodating cavity, one end of the second elastic member is inserted into the first slot, and the other end abuts against the support member; along the third direction, the support member can move in a direction away from the first wall, and can drive the connecting portion to move in the first slot and squeeze the second elastic member.

[0027] Optionally, the support member includes a second main body; along the third direction, a first protrusion is provided on a side of the first wall facing the second flow channel plate, the second main body is arranged on the first wall, and a card slot is provided on a side of the second main body facing the first wall, and the second main body is card-connected to the first protrusion through the card slot; the liquid inlet and the liquid outlet are arranged at opposite ends of the first protrusion along the second direction; along the third direction, one end of the second elastic member is inserted into the first slot, and the other end abuts against the second main body, the second main body can move in a direction away from the first wall, and the support member drives the connecting part to move in the first slot and squeeze the second elastic member through the second main body.

[0028] Optionally, the support member also includes a limiting portion; along the first direction, a limiting portion is respectively provided at the opposite ends of the second main body, a guide cavity is defined between the two limiting portions, and along the third direction, the limiting portion penetrates the second flow channel plate, the crimping portion is inserted into the guide cavity, and the two limiting portions cooperate to form a guide for the crimping portion to move along the third direction.

[0029] Optionally, the second flow channel plate is provided with a plurality of second protrusions protruding from one side thereof toward the first wall along the third direction, and the first protrusion is embedded between two second protrusions adjacent to each other along the second direction; the second flow channel plate is provided with a plurality of third protrusions protruding from one side thereof away from the first wall along the third direction, and the second flow channel is defined between two third protrusions adjacent to each other along the second direction; and the first liquid cooling plate is abutted against the third protrusions along the third direction.

[0030] Optionally, the first liquid cooling plate also includes a connecting piece, which includes a third body; the third body penetrates the second flow channel plate along the third direction and is inserted into the first wall, and the third body is arranged between the first sub-plate and the second sub-plate; along the second direction, a second through hole is opened on the third body, which penetrates the third body, one end of the third body is clamped and connected to the first sub-plate, and the other end is clamped and connected to the second sub-plate, and the sub-flow channels in the first sub-plate and the second sub-plate are connected through the second through hole.

[0031] Optionally, along the third direction, a first protrusion is provided on a side of the first wall facing the second flow channel plate, and a second slot is opened at one end of the first protrusion facing the second flow channel plate. The second slot includes two slot walls arranged opposite to each other along the second direction; along the third direction, a clamping portion is protruding from one end of the third body adjacent to the first wall, and the clamping portion is inserted into the second slot and clamped and connected to the slot wall.

[0032] Optionally, the connecting member also includes a clip-on member; along the second direction, at least one of the clip-on members is respectively provided at the opposite ends of the third main body, the clip-on member is inserted into the second through hole, a third through hole is provided on the clip-on member, and the third through hole is connected with the second through hole; along the second direction, the clip-on member provided at one end of the third main body is clip-connected with the first sub-board, and the clip-on member provided at the other end of the third main body is clip-connected with the second sub-board; the sub-channels in the first sub-board and the second sub-board are connected through the third through hole and the second through hole.

[0033] Optionally, the first liquid cooling plate includes a first sub-plate, a second sub-plate and at least one third sub-plate, and the first sub-plate, the at least one third sub-plate and the second sub-plate are connected along the second direction.

[0034] A second aspect of an embodiment of the present application provides an electrical device, comprising a battery pack as described above, wherein the battery pack provides the electrical device with electrical energy required for operation.

[0035] In summary, the embodiments of the present application provide a battery pack and an electrical device having the battery pack, wherein the battery pack is provided with a first flow channel plate on a side of the first wall of the box body facing away from the second wall, and a liquid inlet channel, a plurality of first branch channels and a plurality of second branch channels are provided on the side of the first flow channel plate facing the first wall, the liquid inlet on the first wall is connected to the first branch channel, the liquid inlet port of the first liquid cooling plate is arranged opposite to the liquid inlet, the liquid inlet channel and the plurality of first branch channels are arranged at intervals along a first direction, and the liquid inlet channel is connected to adjacent first branch channels, two adjacent first branch channels are connected through the second branch channel, and the number of second branch channels between two adjacent first branch channels increases from one end close to the liquid inlet channel to the end away from the liquid inlet channel. One end is reduced, thereby the heat-conducting fluid entering the first branch flow channel is shunted and pressure-divided through the second branch flow channel, and the flow cross-sectional area between two adjacent first branch flow channels is adjusted by changing the number of the second branch flow channels, thereby adjusting the pressure of the heat-conducting fluid entering the first branch flow channel, so that the pressure of the heat-conducting fluid in the multiple first branch flow channels spaced apart along the first direction is more balanced, and then the pressure and flow rate of the heat-conducting fluid in the first flow channel entering the first liquid cooling plate through the liquid inlet are more balanced, so that the first liquid cooling plates at different positions have similar regulating effects on the temperature of the battery cells abutting thereto, and the temperature uniformity of the battery cells at different positions is better, thereby ensuring the safe use of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application from a first angle;

[0038] Figure 2 is a schematic structural diagram of a battery pack provided in an embodiment of the present application from a second angle;

[0039] Figure 3 yes Figure 1 Exploded diagram of

[0040] Figure 4 is a schematic structural diagram of a first flow channel plate in a battery pack provided in an embodiment of the present application;

[0041] Figure 5 yes Figure 4 A top view of

[0042] Figure 6 is a schematic diagram of the structure of the battery pack provided in an embodiment of the present application with the box removed;

[0043] Figure 7 yes Figure 6 A magnified schematic diagram of part of the structure at center A;

[0044] Figure 8 yes Figure 6 An enlarged schematic diagram of the partial structure at B;

[0045] Fig. 9 is a schematic structural diagram of a first angle of a second flow channel plate in a battery pack provided in an embodiment of the present application;

[0046] Fig.10 is a schematic structural diagram of a second angle of a second flow channel plate in a battery pack provided in an embodiment of the present application;

[0047] Fig.11 is a first angle schematic diagram of the combined structure of the first single plate and the valve body in the battery pack provided in an embodiment of the present application;

[0048] Fig.12 is a second angle schematic diagram of the combined structure of the first single plate and the valve body in the battery pack provided in the embodiment of the present application;

[0049] Fig.13 yes Fig.12 A schematic diagram of the enlarged structure at C;

[0050] Fig.14 is a schematic diagram of the structure of the first single board in the battery pack provided in an embodiment of the present application;

[0051] Fig.15 yes Fig.14 DD section view;

[0052] Fig.16 yes Fig.14 EE section view;

[0053] Fig.17 is a schematic diagram of a partial cross-sectional structure of a second single board in a battery pack provided in an embodiment of the present application;

[0054] Fig.18 is a schematic structural diagram of the third board in the battery pack provided in an embodiment of the present application;

[0055] Fig.19 yes Fig.18 FF section view;

[0056] Fig. 20 yes Fig.18 GG section view;

[0057] Fig.21 is a structural schematic diagram of a valve body provided in an embodiment of the present application;

[0058] Fig. 22 yes Fig.21 HH sectional view;

[0059] Fig.23 is a schematic structural diagram of a valve body in a battery pack provided in an embodiment of the present application at a first pressure threshold;

[0060] Fig.24 is a schematic diagram of the structure of a valve body in a battery pack provided in an embodiment of the present application at a second pressure threshold;

[0061] Fig.25 It is a schematic diagram of the combined structure of the valve body, the connector, the second elastic member and the support member in the battery pack provided in the embodiment of the present application;

[0062] Fig.26 yes Figure 1 II-direction cross-sectional view;

[0063] Fig. 27 yes Fig.26 A schematic diagram of the enlarged structure at J;

[0064] Fig.28 yes Fig.26 A schematic diagram of the enlarged structure at K;

[0065] Fig.29 yes Fig.26 A schematic diagram of the structure at L is enlarged;

[0066] Fig.30 It is a schematic diagram of the combined structure of the box body and the first liquid cooling plate in the battery pack provided in the embodiment of the present application;

[0067] Fig.31 yes Fig.30 A schematic diagram of the structure at M of FIG.

[0068] Fig.32 This is a schematic diagram of a first structure of a first liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0069] Fig.33 is a second structural schematic diagram of the first liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0070] Fig.34 yes Fig.33 NN section view after removing the valve body;

[0071] Fig.35 yes Fig.34 A schematic diagram of the structure at O ​​of FIG.

[0072] Fig.36 yes Fig.34 A schematic diagram of the structure at P of FIG.

[0073] Fig.37 is a schematic structural diagram of a first sub-plate in a first liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0074] Fig.38 is a schematic structural diagram of the second sub-plate in the first liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0075] Fig.39 is a schematic structural diagram of the third sub-plate in the first liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0076] Fig.40 is a schematic structural diagram of a connector in a first liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0077] Fig.41 is a schematic structural diagram of a support member in a first liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0078] Fig.42 It is a schematic diagram of the combined structure of the connector and the elastic member in the first liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0079] Fig.43 is a schematic structural diagram of a connector in a first liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0080] Fig.44 is a structural schematic diagram of a third body of a connector in a first liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0081] Fig.45 is a schematic structural diagram of a clamping member of a connector in a first liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0082] Fig.46 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0083] Description of main reference numerals:

[0084] 1. Battery pack;

[0085] 10. box body, 101. accommodating chamber, 1011. first compartment, 1012. second compartment, 11. first wall, 111. liquid inlet, 112. liquid outlet, 113. first protrusion, 1131. second slot, 1132. slot wall, 1133. bayonet, 12. second wall, 13. third wall, 14. fourth wall, 15. liquid inlet pipe, 16. liquid outlet pipe, 17. partition;

[0086] 20. Battery cell, 21. First side, 22. Second side, 23. Third side, 24. Fourth side, 25. Fifth side, 26. Sixth side, 27. Post;

[0087] 30. first liquid cooling plate, 301. first flow channel, 302. liquid inlet port, 303. liquid outlet port, 304. first through hole, 305. crimping portion, 3051. first slot, 31. plug-in component, 310. first accommodating cavity, 311. plug-in portion, 3111. first plug-in portion, 3112. second plug-in portion, 3113. flow guide opening, 3114. shielding portion, 3115. sealing ring, 312. connecting portion, 313. connecting rod, 3120. second accommodating cavity, 3121. receiving portion part, 3122, vent hole, 32, sub-plate, 320, sub-channel, 321, first sub-plate, 322, second sub-plate, 323, third sub-plate, 33, second elastic member, 34, support member, 341, second body, 3410, vent hole, 342, slot, 343, limiter, 3430, guide cavity, 35, connector, 351, third body, 3511, second through hole, 3512, clamping part, 352, clamping member, 3521, third through hole, 3522, spring piece;

[0088] 40. first flow channel plate, 401. liquid inlet flow channel, 402. first branch flow channel, 403. second branch flow channel, 404. liquid outlet flow channel, 41. first filling part, 410. first filling cavity, 42. second filling part, 420. second filling cavity;

[0089] 50. second flow channel plate, 51. second flow channel, 511. first end, 512. second end, 52. second protrusion, 53. third protrusion, 54. first socket, 55. second socket, 56. third socket, 57. fourth socket;

[0090] 60, second liquid cooling plate, 61, first single plate, 610, third flow channel, 611, first bending portion, 612, first port, 613, second port, 614, first manifold plate, 62, second single plate, 620, fourth flow channel, 621, second bending portion, 622, third port, 623, fourth port, 624, second manifold plate, 63, third single plate, 630, fifth flow channel, 631, supporting portion, 632, covering portion, 633, fifth port, 634, sixth port, 635, third manifold plate;

[0091] 70. valve body, 71. first main body, 710. flow guiding cavity, 711. flow guiding port, 712. position limiting portion, 72. baffle, 721. first blocking portion, 722. second blocking portion, 723. recessed portion, 73. first elastic member, 74. guide column;

[0092] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0093] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0094] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0095] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0097] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0098] The embodiment of the present application provides an electric device, including a battery pack 1, and the battery pack 1 serves as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0099] In some embodiments of the present application, a battery pack 1 is provided, referring to Figure 1 to Figure 8 as well as Figure 25~Figure 46 The battery pack 1 includes: a box body 10, a battery cell 20, a first liquid cooling plate 30 and a first flow channel plate 40. The battery pack 1 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 to Figure 46 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0100] Reference Figure 1~Figure 3 as well as Figure 26~Figure 31The box body 10 is provided with a receiving cavity 101 inside. The box body 10 includes a first wall 11 and a second wall 12 arranged opposite to each other along the third direction Z, and also includes a third wall 13 and a fourth wall 14 arranged opposite to each other along the first direction X. Fig. 27 and Fig.30 A liquid inlet 111 is formed at one end of the first wall 11 along the second direction Y, and a liquid outlet 112 is formed at the other end of the first wall 11 along the second direction Y. The liquid inlet 111 and the liquid outlet 112 penetrate the first wall 11 along the third direction Z. Figure 1~Figure 3 as well as Fig.30 The third wall 13 is provided with a liquid inlet pipe 15 and a liquid outlet pipe 16, which are arranged at intervals along the second direction Y. One end of the liquid inlet pipe 15 is located outside the third wall 13, and the other end extends into the accommodating cavity 101 and passes through the first wall 11 along the third direction Z. Figure 1 , Figure 3 as well as Fig.30 A partition 17 is provided in the accommodating chamber 101 of the box body 10, and the partition 17 extends along the second direction Y and is inscribed in the box body 10, so as to divide the accommodating chamber 101 into a first compartment 1011 and a second compartment 1012 arranged at intervals along the first direction X, and the liquid inlet pipe 15 and the liquid outlet pipe 16 extend into the second compartment 1012 respectively. The length direction of the box body 10 is parallel to the first direction X, the width direction of the box body 10 is parallel to the second direction Y, and the height direction of the box body 10 is parallel to the third direction Z.

[0101] Reference Figure 1 , Figure 3 , Figure 6~Figure 8 , Figure 26~Figure 29 as well as Fig.46 The battery cell 20 is disposed in the receiving chamber 101 of the box body 10. Specifically, the battery cell 20 is disposed in the first compartment 1011 of the receiving chamber 101. Fig.46 The battery cell 20 is a square battery. The battery cell 20 includes a first surface 21 and a second surface 22 arranged opposite to each other along a first direction X, a third surface 23 and a fourth surface 24 arranged opposite to each other along a second direction Y, and a fifth surface 25 and a sixth surface 26 arranged opposite to each other along a third direction Z. The first surface 21, the third surface 23, the second surface 22 and the fourth surface 24 are sequentially connected end to end to form a shell structure with open ends. The fifth surface 25 and the sixth surface 26 cover the open ends respectively. The first surface 21 and the second surface 22 are surfaces with the largest surface areas. The battery cell 20 also includes a pole 27, which is arranged on the sixth surface 26.

[0102] Reference Figure 1 , Figure 3 , Figure 6~Figure 8 , Figure 26~Figure 29 as well as Figure 32~Figure 45The first liquid cooling plate 30 is disposed in the accommodating cavity 101 of the box body 10. Specifically, the first liquid cooling plate 30 is disposed in the first compartment 1011 of the accommodating cavity 101. Figure 1 , Figure 3 , Figure 6~Figure 8 as well as Figure 26~Figure 29 The first liquid cooling plate 30 abuts against the battery cell 20 along the first direction X, referring to Fig.26 as well as Fig.34 The first liquid cooling plate 30 is provided with a first flow channel 301 for the flow of heat transfer fluid. Fig. 27 and Fig.37 Along the third direction Z, a liquid inlet port 302 communicating with the first flow channel 301 is provided on one side of the first liquid cooling plate 30 facing the first wall 11. The liquid inlet port 302 is arranged opposite to the liquid inlet port 111. Fig.29 and Fig.38 Along the third direction Z, a bag surface of the first liquid cooling plate 30 facing the first wall 11 is provided with a liquid outlet port 303 connected with the first flow channel 301 , and the liquid outlet port 303 is arranged opposite to the liquid outlet 112 .

[0103] Reference Figure 2~Figure 8 as well as Figure 26~Figure 29 The first flow channel plate 40 is disposed on a side of the first wall 11 away from the second wall 12 along the third direction Z. The first flow channel plate 40 is provided with a liquid inlet channel 401, a plurality of first branch flow channels 402 and a plurality of second branch flow channels 403 on a side of the first flow channel plate 40 toward the first wall 11 along the third direction Z. Fig. 27 The liquid inlet 111 on the first wall 11 is connected to the first branch channel 402 along the third direction Z, referring to Figure 4~Figure 7 , along the first direction X, a plurality of first branch flow channels 402 are arranged at intervals, and the liquid inlet flow channel 401 is connected with the adjacent first branch flow channels 402. Specifically, the liquid inlet flow channel 401 extends along the first direction X, and the first branch flow channel 402 extends along the second direction Y. The plurality of first branch flow channels 402 are arranged at intervals along the first direction X, and one end of the liquid inlet flow channel 401 along the first direction X is connected with the adjacent first branch flow channel 402. Two adjacent first branch flow channels 402 along the first direction X are connected through the second branch flow channel 403, that is, the second branch flow channel 403 extends along the first direction X to connect the two adjacent first branch flow channels 402. Figure 4~Figure 5 , the number of second branch flow channels 403 between two adjacent first branch flow channels 402 along the first direction X decreases from an end close to the liquid inlet flow channel 401 to an end away from the liquid inlet flow channel 401 along the first direction X. Among them, one end of the liquid inlet pipe 15 extending into the accommodating cavity 101 and penetrating the first wall 11 is connected to the liquid inlet flow channel 401, so as to inject heat transfer fluid into the liquid inlet flow channel 401 through the liquid inlet pipe 15.

[0104] In the battery pack, a heat transfer fluid is passed into the liquid cooling plate to regulate and control the temperature of the battery cells. The liquid inlet pipeline for passing the heat transfer fluid is usually arranged on a side wall of the box body, and the heat transfer fluid is provided to the liquid cooling plate through the liquid inlet pipeline. This liquid supply method will cause uneven pressure distribution of the heat transfer fluid passing into the liquid cooling plate. Specifically, the pressure of the heat transfer fluid near the liquid inlet end inside the liquid cooling plate is relatively large, and the flow rate is relatively fast. The liquid cooling plate has a better temperature regulating effect on the battery cells near the liquid inlet end. As the heat transfer fluid moves away from the liquid inlet end, the flow rate of the heat transfer fluid slows down, resulting in a relatively small pressure of the heat transfer fluid inside the liquid cooling plate away from the liquid inlet end. The liquid cooling plate has a poor temperature regulating effect on the battery cells away from the liquid inlet end, resulting in poor temperature uniformity of the battery cells at different positions, affecting the safety of the battery cells, and then affecting the safety of the battery pack.

[0105] The battery pack 1 provided in the embodiment of the present application is provided with a first liquid cooling plate 30 in the accommodating cavity 101 of the box body 10, the first liquid cooling plate 30 is in contact with the battery cell 20 along the first direction X, a liquid inlet 111 is provided at one end of the first wall 11 along the second direction Y, a liquid inlet port 302 of the first liquid cooling plate 30 is arranged opposite to the liquid inlet 111 along the third direction Z, a first flow channel plate 40 is provided on a side of the first wall 11 of the box body 10 away from the second wall 12, a liquid inlet channel 401, a plurality of first branch channels 402 and a plurality of second branch channels 403 are provided on the side of the first flow channel plate 40 facing the first wall 11 along the third direction Z, and the liquid inlet 111 is provided at one end of the first wall 11 along the second direction Y. 1 is connected with the first branch flow channel 402 along the third direction Z, the liquid inlet flow channel 401 and the plurality of first branch flow channels 402 are arranged at intervals along the first direction X, and the liquid inlet flow channel 401 is connected with the adjacent first branch flow channels 402, and two adjacent first branch flow channels 402 along the first direction X are connected through the second branch flow channels 403, and the number of the second branch flow channels 403 between the two adjacent first branch flow channels 402 decreases from the end close to the liquid inlet flow channel 401 along the first direction X to the end away from the liquid inlet flow channel 401, and a part of the heat transfer fluid entering the first branch flow channel 402 through the liquid inlet flow channel 401 enters the liquid inlet port 111 and the liquid inlet port 302. The heat transfer fluid that enters the first branch flow channel 402 through the liquid inlet flow channel 401 is divided and divided in pressure through the second branch flow channel 403. The more the number of the second branch flow channels 403 is, the smaller the flow cross-sectional area of ​​the heat transfer fluid between two adjacent first branch flow channels 402 is, the slower the flow rate of the heat transfer fluid between two adjacent first branch flow channels 402 is, and the better the effect of dividing and dividing the heat transfer fluid in the first branch flow channel 402 is, thereby reducing the fluid pressure and the pressure of the heat transfer fluid in the first branch flow channel 402 near one end of the liquid inlet flow channel 401. The fluid velocity is improved, and the uniformity of the fluid pressure and fluid velocity of the heat-conducting fluid entering the first branch channel 402 through the second branch channel 403 is improved, thereby improving the uniformity of the fluid pressure and fluid velocity of the heat-conducting fluid entering the first liquid cooling plate 30 through the first branch channel 402, the liquid inlet 111 and the liquid inlet port 302, and improving the uniformity of the fluid pressure and fluid velocity of the heat-conducting fluid in the multiple first liquid cooling plates 30 arranged at intervals along the first direction X, achieving a flow equalization effect, thereby improving the temperature uniformity of the multiple battery cells 20 arranged at intervals along the first direction X, improving the safety of the battery cells 20, and improving the safety of the battery pack 1.

[0106] In some embodiments, the housing 10 is integrally formed by a die-casting process.

[0107] In some embodiments, reference Figure 2 , Figure 4~Figure 8The first flow channel plate 40 includes a plurality of first filling portions 41. The plurality of first filling portions 41 are arranged at intervals along the first direction X. At least one first filling portion 41 is arranged between two adjacent first branch flow channels 402. Figure 4 and Figure 5 In the embodiment shown, a first filling portion 41 is disposed between two adjacent first branch flow channels 402. Figure 2 , Figure 4~Figure 5 as well as Figure 7 The first filling portion 41 is provided with a first filling cavity 410 for accommodating the filling material. Figure 2 and Figure 5 The first filling part 41 has a dimension S mm along the second direction Y. Along the first direction X, the dimension S of the plurality of first filling parts 41 increases from the end close to the liquid inlet channel 401 to the end away from the liquid inlet channel 401. The second branch channel 403 is arranged between two adjacent first branch channels 402, and the first filling part 41 is also arranged between two adjacent first branch channels 402. Therefore, as the dimension S of the first filling part 41 increases, the number of the second branch channels 403 between two adjacent first branch channels 402 decreases, and the flow division and pressure division effect on the heat transfer fluid becomes weaker, thereby ensuring the uniformity of the fluid pressure and fluid velocity of the heat transfer fluid in the plurality of first branch channels 402, thereby ensuring the uniformity of the heat transfer fluid entering the first liquid cold plate 30, and improving the temperature uniformity of the plurality of battery cells 20 arranged at intervals along the first direction X. The first filling cavity 410 in the first filling part 41 is opened, and a filler, such as a heat-insulating material such as heat-insulating cotton, can be arranged in the first filling cavity 410, so as to reduce the energy loss of the heat-conducting fluid in the first branch channel 402 and the second branch channel 403 during the transmission process, thereby ensuring the temperature control effect of the heat-conducting fluid on the battery cell 20. In some implementations, the filler can be selected according to actual use requirements. In some implementations, the first filling cavity 410 penetrates the first flow channel plate 40 along the third direction Z to form a through-hole structure, and the first filling cavity 410 can partially penetrate the first flow channel plate 40 to form a groove structure. In some other implementations, two or more first filling parts 41 can be arranged between two first branch channels 402 adjacent to each other along the first direction X, and it is only necessary to ensure that the sum S of the dimensions of the two or more first filling parts 41 along the second direction Y increases from the end close to the inlet flow channel 401 to the end away from the inlet flow channel 401 along the first direction X.

[0108] In some embodiments, reference Figure 2 , Figure 4~Figure 5 as well as Figure 7~Figure 8The first flow channel plate 40 also includes a second filling portion 42, which is arranged between two adjacent first branch channels 402 along the first direction X. A second filling cavity 420 for accommodating fillers is provided inside the second filling portion 42. Along the second direction Y, a second branch channel 403 is defined between the first filling portion 41 and the adjacent second filling portion 42, and a second branch channel 403 is defined between two adjacent second filling portions 42. Along the first direction X, the number of second filling portions 42 between two adjacent first branch channels 402 decreases from the end close to the liquid inlet channel 401 to the end away from the liquid inlet channel 401. The number of second branch channels 403 between two adjacent first branch channels 402 is determined by the number of second filling parts 42. The more the number of second filling parts 42, the more the number of second branch channels 403 defined and formed. The number of second filling parts 42 decreases from one end close to the liquid inlet channel 401 to one end away from the liquid inlet channel 401 along the first direction X, so that the number of second branch channels 403 decreases from one end close to the liquid inlet channel 401 to one end away from the liquid inlet channel 401 along the first direction X, forming a partial pressure and equal flow of the heat-conducting fluid in the multiple first branch channels 402, ensuring the temperature control effect of the heat-conducting fluid on the battery cell 20. The second filling cavity 420 is opened, and a filler, such as a heat-insulating material such as heat-insulating cotton, can be set in the second filling cavity 420, so as to reduce the energy loss of the heat-conducting fluid in the first branch channel 402 and the second branch channel 403 during the transmission process, thereby ensuring the temperature control effect of the heat-conducting fluid on the battery cell 20. In some implementations, the filler can be selected according to actual use requirements.

[0109] In some embodiments, reference Figure 4~Figure 5 , Figure 6 , Figure 8 , Fig.26 as well as Fig.29 A liquid outlet channel 404 is provided on one side of the first flow channel plate 40 along the third direction Z toward the first wall 11, the liquid outlet port 112 on the first wall 11 is connected with the liquid outlet channel 404 along the third direction Z, the liquid inlet is along the second direction Y, the liquid inlet channel 401 and the liquid outlet channel 404 are arranged at intervals, the first branch channel 402 and the liquid outlet channel 404 are arranged at intervals, the heat transfer fluid entering the first branch channel 402 through the liquid inlet channel 401 enters the first flow channel 301 of the first liquid cooling plate 30 through the liquid inlet port 111 and the liquid inlet port 302, and enters the liquid outlet channel 404 through the liquid outlet port 303 and the liquid outlet port 112 to form a circulation. Among them, one end of the liquid outlet pipe 16 is located outside the third wall 13, and the other end extends into the accommodating cavity 101 and penetrates the first wall 11 along the third direction Z and is connected with the liquid outlet channel 404, so that the heat transfer fluid in the liquid outlet channel 404 is discharged to the outside of the box body 10 through the liquid outlet pipe 16, forming a circulation of the heat transfer fluid.

[0110] In some embodiments, reference Figure 3 , Figure 6~Figure 10 as well as Figure 28-29 The battery pack 1 further includes a second flow channel plate 50, which is disposed on a side of the first wall 11 facing the second wall 12 along the third direction Z. A second flow channel 51 for the flow of a heat transfer fluid is disposed on the side of the second flow channel plate 50 facing the second wall 12. The second flow channel 51 extends along the second direction Y. The battery cell 20 and the first liquid cooling plate 30 are both disposed on the second flow channel plate 50. The second flow channel 51 is spaced apart from the first liquid cooling plate 30 along the first direction X. Figure 1 , Figure 3 , Figure 6~Figure 8 , Figure 11~Figure 20 as well as Figure 26~Figure 29 The battery pack 1 also includes a second liquid cooling plate 60, which is disposed on the second flow channel plate 50. Figure 1 , Figure 3 , Figure 6~Figure 7 , Figure 11~Figure 13 as well as Fig.26 and Fig. 27 The second liquid cooling plate 60 includes a first single plate 61, the first single plate 61 is in contact with the battery cell 20 along the second direction Y, a third flow channel 610 for heat transfer fluid to flow is provided inside the first single plate 61, a liquid inlet end of the third flow channel 610 is arranged opposite to the liquid inlet 111 and can be communicated with the liquid inlet 111, and a liquid outlet end of the third flow channel 610 is communicated with the second flow channel 51 of the second flow channel plate 50, specifically, the liquid inlet end of the third flow channel 610 is arranged opposite to the liquid inlet 111 along the first direction X and can be communicated with the liquid inlet 111, and the liquid outlet end of the third flow channel 610 is communicated with the second flow channel 51 along the second direction Y, a part of the heat transfer fluid in the first branch flow channel 402 enters the first flow channel 301 of the first liquid cooling plate 30 via the liquid inlet 111 and the liquid inlet port 302, forming For the temperature control of the first surface 21 or the second surface 22 of the battery cell 20, a part of the heat-conducting fluid enters the third flow channel 610 through the liquid inlet 111 and the liquid inlet end of the third flow channel 610, so as to form the temperature control of the third surface 23 or the fourth surface 24 of the battery cell 20 abutting against the first single plate 61, and the heat-conducting fluid entering the third flow channel 610 can enter the second flow channel 51 through the liquid outlet end and directly contact the fifth surface 25 of the battery cell 20, so as to form the temperature control of the fifth surface 25 of the battery cell 20, thereby forming the temperature control of multiple surfaces of the battery cell 20, thereby improving the temperature uniformity of the battery cell 20, and the first single plate 61 can form a clamping and fixing of the battery cell 20 along the second direction Y, thereby improving the assembly stability of the battery cell 20 in the box body 10.

[0111] In some embodiments, reference Fig.30 and Fig.31A first protrusion 113 is provided on one side of the first wall 11 facing the second flow channel plate 50 along the third direction Z. The first protrusion 113 extends along the second direction Y. The liquid inlet 111 and the liquid outlet 112 are respectively provided at both ends of the first protrusion 113 along the second direction Y. The liquid inlet 111 and the liquid outlet 112 respectively penetrate the first protrusion 113 along the third direction Z. Fig.10 The second flow channel plate 50 is provided with a plurality of second protrusions 52 protruding from one side thereof facing the first wall 11 along the third direction Z, and the first protrusion 113 is embedded between two adjacent second protrusions 52 along the second direction Y, thereby improving the installation stability and firmness of the second flow channel plate 50 on the first wall 11. Fig. 9 A second flow channel plate 50 is provided with a plurality of third protrusions 53 protruding from one side away from the first wall 11 along the third direction Z, and a second flow channel 51 is defined between two adjacent third protrusions 53 along the second direction Y, and the first liquid cooling plate 30 is in contact with the third protrusions 53 along the third direction Z.

[0112] In some implementations, the second protrusion 52 may be directly formed on the second flow channel plate 50 during the processing and forming process. The depression formed by the second protrusion 52 on the second flow channel plate 50 is the second flow channel 51 , and a third protrusion 53 is formed between two adjacent second protrusions 52 .

[0113] In some embodiments, reference Figure 7 as well as Figure 11~Figure 15 , the opposite ends of the first single plate 61 along the third direction Z are bent to form first bent portions 611, specifically, the opposite ends of the first single plate 61 along the third direction Z are bent to the same side to form the first bent portions 611, the liquid inlet end and the liquid outlet end of the third flow channel 610 are respectively provided on the first bent portion 611 adjacent to the second flow channel plate 50 along the third direction Z, and the first bent portion 611 away from the second flow channel plate 50 along the third direction Z overlaps with the sixth surface 26 of the battery cell 20 provided with the pole 27, specifically, the first bent portion 611 adjacent to the second flow channel plate 50 along the third direction Z is provided with a first port 612 and a second port 613 respectively connected to the third flow channel 610, the first port 612 is toward the liquid inlet 111 along the first direction X, and the second port 613 is toward the second flow channel 51 along the second direction Y, refer to Fig.15 and Fig.16A first shunt plate 614 extending along the third direction Z is provided inside the first single plate 61. The first shunt plate 614 divides the third flow channel 610 into a first liquid inlet flow channel connected to the first port 612 and a first liquid outlet flow channel connected to the second port 613. The first liquid inlet flow channel and the first liquid outlet flow channel are connected at a first bending portion 611 away from the second flow channel plate 50. Part of the heat transfer fluid in the first branch flow channel 402 enters the first liquid inlet flow channel through the liquid inlet port 111 via the first port 612, and enters the first liquid outlet flow channel through the first bending portion 611 away from the second flow channel plate 50, enters the second flow channel 51 via the second port 613 and directly contacts the fifth surface 25 of the battery cell 20 to adjust the temperature of the fifth surface 25. Moreover, along the third direction Z, the first bent portion 611 adjacent to the second flow channel plate 50 forms a support for the fifth side 25 of the battery cell 20, and the first bent portion 611 away from the second flow channel plate 50 forms a cover for the sixth side 26 of the battery cell 20, thereby wrapping and fixing the battery cell 20, and the temperature of the sixth side 26 of the pole 27 of the battery cell 20 can be regulated, so that the pole 27 is in a suitable operating temperature range, thereby improving the service life of the battery cell 20.

[0114] In some embodiments, reference Fig. 9 and Fig.10 The second flow channel 51 includes a first end 511 and a second end 512 which are arranged opposite to each other along the second direction Y. The first end 511 and the second end 512 are respectively provided with a second socket 55 which passes through the second flow channel plate 50 along the third direction Z. The first end 511 and the second end 512 are also respectively provided with a third socket 56 which passes through the second flow channel plate 50 along the third direction Z. The first single plate 61 is embedded in the second flow channel 51. The first bending portion 611 adjacent to the second flow channel plate 50 along the third direction Z is inserted into the second socket 55 located at the first end 511. The first port 612 is connected to the third socket 56 located at the first end 511 along the first direction X.

[0115] In some embodiments, reference Figure 1 , Figure 3 , Figure 6 , Figure 8 , Fig.17 , Fig.26 and Fig.29 The second liquid cooling plate 60 further includes a second single plate 62. Along the second direction Y, the second single plate 62 is arranged opposite to the first single plate 61 and abuts against the battery cells 20 respectively. Specifically, referring to Figure 6~Figure 8 as well as Fig.26 Along the second direction Y, the first single plate 61 abuts against the third surface 23 of the adjacent battery cell 20, and the second single plate 62 abuts against the fourth surface 24 of the adjacent battery cell 20, referring to Fig.17A fourth flow channel 620 for the flow of heat-conducting fluid is provided inside the second single plate 62, the liquid inlet end of the fourth flow channel 620 is connected to the second flow channel 51, and the liquid outlet end is connected to the liquid outlet 112, the opposite ends of the second single plate 62 are bent to form second bending portions 621, the liquid inlet end and the liquid outlet end of the fourth flow channel 620 are respectively opened on the second bending portions 621 adjacent to the second flow channel plate 50, along the third direction Z, one second bending portion 621 abuts against the fifth surface 25 of the battery cell 20, and the other second bending portion 621 abuts against the sixth surface 26 of the battery cell 20.

[0116] Specifically, refer to Figure 8 as well as Fig.17 The opposite ends of the second single plate 62 along the third direction Z are bent toward the same side to form a second bent portion 621. A third port 622 and a fourth port 623 respectively connected to the fourth flow channel 620 are provided on the second bent portion 621 adjacent to the second flow channel plate 50 along the third direction Z. The third port 622 is the liquid inlet end of the fourth flow channel 620, and the fourth port 623 is the liquid outlet end of the fourth flow channel 620. The third port 622 is toward the second flow channel 51 along the second direction Y and is connected to the second flow channel 51. The fourth port 623 is toward the liquid outlet 112 along the first direction X. Fig.17 A second shunt plate 624 extending along the third direction Z is provided inside the second single plate 62. The second shunt plate 624 divides the fourth flow channel 620 into a second liquid inlet flow channel connected to the third port 622 and a second liquid outlet flow channel connected to the fourth port 623. The second liquid inlet flow channel is connected to the second liquid outlet flow channel at the second bending portion 621 away from the second flow channel plate 50. The heat transfer fluid in the second flow channel 51 enters the second liquid inlet flow channel through the third port 622, enters the second liquid outlet flow channel through the second bending portion 621 away from the second flow channel plate 50, and enters the liquid outlet flow channel 404 through the fourth port 623 and the liquid outlet 112, thereby controlling the temperature of the fourth surface 24 of the battery cell 20 abutting against the second single plate 62 through the second single plate 62. Moreover, along the third direction Z, the second bend portion 621 adjacent to the second flow channel plate 50 forms a support for the fifth side 25 of the battery cell 20, and the second bend portion 621 away from the second flow channel plate 50 forms a cover for the sixth side 26 of the battery cell 20, thereby wrapping and fixing the battery cell 20, and the temperature of the sixth side 26 of the pole 27 of the battery cell 20 can be regulated, so that the pole 27 is in a suitable operating temperature range, thereby improving the service life of the battery cell 20.

[0117] In some embodiments, reference Fig. 9 and Fig.10The second single plate 62 is embedded in the second flow channel 51, and the second bending portion 621 adjacent to the second flow channel plate 50 along the third direction Z is inserted into the second socket 55 located at the second end 512, and the fourth port 623 is connected to the third socket 56 located at the second end 512 along the first direction X.

[0118] In some embodiments, reference Figure 1 , Figure 3 , Figure 6~Figure 8 , Figure 18~Figure 20 , Fig.26 and Fig.28 The second liquid cooling plate 60 further includes a third single plate 63, which is embedded in the second flow channel 51. Figure 1 and Figure 3 as well as Figure 6~Figure 8 Along the second direction Y, a plurality of battery cells 20 are arranged between the first single board 61 and the second single board 62, and a third single board 63 is arranged between two adjacent battery cells 20. Figure 19~Figure 20 A fifth flow channel 630 for the heat transfer fluid to flow is provided inside the third single plate 63, and the liquid inlet and outlet of the fifth flow channel 630 are respectively connected to the second flow channel 51. Figure 18~Figure 20 Along the third direction Z, a supporting portion 631 is provided at one end of the third single plate 63, and a covering portion 632 is provided at the other end. The liquid inlet end and the liquid outlet end of the fifth flow channel 630 are respectively opened on the supporting portion 631, the supporting portion 631 abuts against the fifth surface 25 of the adjacent battery cell 20, and the covering portion 632 abuts against the sixth surface 26 of the adjacent battery cell 20.

[0119] Specifically, refer to Figure 7 as well as Figure 18~Figure 20 The support portion 631 is provided with a fifth port 633 and a sixth port 634 respectively connected to the fifth flow channel 630. Along the second direction Y, the fifth port 633 as the liquid inlet end of the fifth flow channel 630 faces the first single plate 61, and the sixth port 634 as the liquid outlet end of the fifth flow channel 630 faces the second single plate 62. The fifth port 633 and the sixth port 634 are respectively connected to the second flow channel 51. Figure 19~Figure 20A third manifold 635 extending along the third direction Z is provided inside the third single plate 63. The third manifold 635 divides the fifth flow channel 630 into a third liquid inlet flow channel and a third liquid outlet flow channel. The third liquid inlet flow channel and the third liquid outlet flow channel are connected at the covering portion 632. The heat transfer fluid entering the third flow channel 610 enters the second flow channel 51 through the second port 613, and the heat transfer fluid entering the second flow channel 51 enters the third liquid inlet flow channel in the fifth flow channel 630 through the fifth port 633, and enters the third liquid outlet flow channel at the covering portion 632, and then flows out through the sixth port 634, thereby forming a temperature control of the side surfaces of two adjacent battery cells 20 along the second direction Y. The covering portion 632 can form a temperature control of the sixth surface 26 of the battery cell 20, thereby adjusting the temperature near the pole 27 arranged on the sixth surface 26. Moreover, along the third direction Z, the support portion 631 forms a support for the fifth side 25 of the battery cell 20, and the covering portion 632 forms a covering for the sixth side 26 of the battery cell 20, thereby wrapping and fixing the battery cell 20, and the temperature of the sixth side 26 of the pole 27 of the battery cell 20 can be regulated, so that the pole 27 is in a suitable operating temperature range, thereby improving the service life of the battery cell 20.

[0120] The first single plate 61, the third single plate 63 and the second single plate 62 are spaced apart along the second direction Y, which can clamp and fix the battery cell 20 along the second direction Y. While adjusting and controlling the temperature of the third surface 23 and the fourth surface 24 of the battery cell 20, the assembly stability of the battery cell 20 in the second direction Y can be ensured.

[0121] In some embodiments, reference Fig. 9 and Fig.10 The second single plate 62 is embedded in the second flow channel 51, and the second bending portion 621 adjacent to the second flow channel plate 50 along the third direction Z is inserted into the second socket 55 located at the second end 512, and the fourth port 623 is connected to the third socket 56 located at the second end 512 along the first direction X.

[0122] In some embodiments, reference Figure 11~Figure 13 , Figure 21 to Figure 25 as well as Fig. 27 The battery pack 1 also includes a valve body 70, referring to Fig. 27 The valve body 70 is inserted into the liquid inlet port 302 of the first liquid cooling plate 30 to block the liquid inlet port 111 and the first flow channel 301. Fig.12 and Fig.13The valve body 70 and the first single plate 61 are arranged along the first direction X to block the liquid inlet 111 and the liquid inlet end of the third flow channel 610. Specifically, the valve body 70 and the first single plate 61 are spaced apart along the first direction X to block the liquid inlet 111 and the first port 612. When the pressure on the valve body 70 reaches a preset first pressure threshold, the liquid inlet 111 and the first flow channel 301 can be connected. When the pressure on the valve body 70 reaches a preset second pressure threshold, the liquid inlet 111 and the liquid inlet end of the third flow channel 610 can be connected. The first pressure threshold is less than the second pressure threshold.

[0123] In other words, the valve body 70 has a preset first pressure threshold and a second pressure threshold. The valve body 70 can be opened when the pressure reaches the first pressure threshold and the second pressure threshold. Since the first pressure threshold is less than the second pressure threshold, the first pressure threshold is the minimum pressure required for the valve body 70 to open. Specifically, when the valve body 70 is in an unopened state (i.e., when the pressure does not reach the first pressure threshold), the valve body 70 forms a barrier between the liquid inlet 111 and the liquid inlet port 302, and at the same time forms a barrier between the liquid inlet 111 and the first port 612 (i.e., the liquid inlet end of the third flow channel 610). The heat transfer fluid in the first branch flow channel 402 cannot enter the liquid inlet port 302 through the liquid inlet 111, nor can it enter the third flow channel 610.

[0124] When the temperature of the battery cell 20 in the battery pack 1 deviates from the normal operating temperature by ±15°C, the battery pack 1 is in a normal operating state. At this time, the pressure of the heat-conducting fluid entering the liquid inlet channel 401 through the liquid inlet pipe 15 is relatively small. The heat-conducting fluid enters the first branch channel 402 through the liquid inlet channel 401 and enters the valve body 70 through the liquid inlet port 111 and applies pressure to the valve body 70. When the fluid pressure of the heat-conducting fluid on the valve body 70 reaches the first pressure threshold, the valve body 70 is partially opened to connect the liquid inlet port 111 with the liquid inlet port 111. Port 302 allows the heat-conducting fluid to enter the first flow channel 301 of the first liquid cooling plate 30, thereby regulating and controlling the temperature of the battery cell 20. Since the fluid pressure on the valve body 70 does not reach the second pressure threshold, the valve body 70 still forms a barrier between the liquid inlet 111 and the first port 612, and the heat-conducting fluid cannot enter the third flow channel 610 of the first single plate 61. The temperature of the battery cell 20 can be regulated only through the first liquid cooling plate 30, thereby improving the utilization rate of the heat-conducting fluid and reducing energy consumption.

[0125] When the temperature of the battery cell 20 in the battery pack 1 deviates greatly from the normal operating temperature (exceeding ±15°C), the battery pack 1 is in an abnormal state, and it is necessary to increase the pressure of the heat-conducting fluid entering the liquid inlet channel 401 through the liquid inlet pipe 15. The heat-conducting fluid enters the first branch channel 402 through the liquid inlet channel 401 and enters the valve body 70 through the liquid inlet port 111 and applies pressure to the valve body 70. Due to the high pressure of the heat-conducting fluid, the fluid pressure on the valve body 70 reaches a preset second pressure threshold, so that the valve body 70 connects the liquid inlet port 111 with the liquid inlet port 302 while also connecting the liquid inlet port 111 with the first port 302. 612, so that a part of the heat-conducting fluid enters the first flow channel 301 through the liquid inlet port 302, and the other part of the heat-conducting fluid enters the third flow channel 610 through the first port 612, thereby regulating the temperature of the battery cell 20 abutting against the first single plate 61, and regulating the temperature near the pole 27 of the battery cell 20. The heat-conducting fluid entering the third flow channel 610 is discharged to the second flow channel 51 through the second port 613 (i.e., the liquid outlet end of the third flow channel 610), and the heat-conducting fluid entering the second flow channel 51 can directly contact the fifth surface 25 of the battery cell 20 to regulate the temperature of the battery cell 20. When the fluid pressure on the valve body 70 reaches the second pressure threshold, the first single plate 61 can not only divert the heat-conducting fluid with a higher pressure to prevent the heat-conducting fluid from damaging the first liquid cooling plate 30 and improve the service life of the first liquid cooling plate 30, but also the first single plate 61 can cooperate with the first liquid cooling plate 30 and the second flow channel plate 50 to form temperature regulation of multiple surfaces of the battery cell 20, thereby improving the temperature regulation efficiency and allowing the operating temperature of the battery cell 20 to return to a reasonable operating temperature range as soon as possible, thereby ensuring the safety of the use of the battery cell 20 and the battery pack 1 and improving the service life of the battery cell 20 and the battery pack 1.

[0126] In some embodiments, reference Figure 11~Figure 13 , Figure 21 to Figure 25 as well as Fig. 27 The valve body 70 includes a first body 71 and a baffle 72, referring to Fig. 27 The first body 71 is inserted into the liquid inlet port 302 of the first liquid cooling plate 30, referring to Figure 22~Figure 24 The first body 71 is provided with a guide cavity 710 that penetrates the first body 71 along the third direction Z. Figure 12~Figure 13 , Fig.21 as well as Figure 23~Figure 24 The first body 71 is provided with a guide port 711 connected to the guide cavity 710 along the first direction X toward the first single plate 61. Figure 11~Figure 13 , Figure 21 to Figure 25 as well as Fig. 27The baffle 72 is arranged in the guide cavity 710, and the baffle 72 includes a first blocking portion 721 and a second blocking portion 722 connected along the third direction Z. The first blocking portion 721 can block the guide cavity 710 to block the liquid inlet 111 and the first flow channel 301. Specifically, the first blocking portion 721 is arranged at one end of the guide cavity 710 away from the first wall 11 along the third direction Z. The first blocking portion 721 is connected to the first main body 71 to block the guide cavity 710, so that the valve body 70 can block the liquid inlet 111 and the first flow channel 301 in the closed state, and the second blocking portion 722 can block the guide port 711 to block the liquid inlet 111 and the liquid inlet end of the third flow channel 610. The baffle 72 can reciprocate along the third direction Z in the guide cavity 710.

[0127] Reference Fig.23 When the pressure on the first blocking portion 721 reaches the first pressure threshold, the liquid inlet 111 and the first flow channel 301 can be connected. Fig. 27 The heat-conducting fluid enters the flow-guiding cavity 710 through the liquid inlet 111 and the liquid inlet port 302 and pushes the first blocking portion 721 along the third direction Z. The first blocking portion 721 is pushed away from the first wall 11 by the heat-conducting fluid and is separated from the first body 71, thereby connecting the flow-guiding cavity 710 and the first flow channel 301 of the first liquid cooling plate 30, so that the heat-conducting fluid enters the first flow channel 301 through the flow-guiding cavity 710 to regulate the temperature of the battery cell 20. Figure 11~Figure 13 as well as Fig.23 Since the pressure of the heat transfer fluid entering the flow guide cavity 710 is relatively small, the fluid pressure applied to the first blocking portion 721 only reaches the first pressure threshold. Although the first blocking portion 721 can drive the second blocking portion 722 to move together during the movement, the fluid pressure on the first blocking portion 721 is relatively small, resulting in the second blocking portion 722 still being able to form a blockage on the flow guide port 711, and the heat transfer fluid entering the flow guide cavity 710 cannot enter the third flow channel 610 through the flow guide port 711 and the first port 612.

[0128] Reference Fig.24 When the pressure on the first blocking portion 721 reaches the second pressure threshold, the liquid inlet 111 and the first flow channel 301 can be connected, and the second blocking portion 722 can be driven to expose at least part of the guide port 711 to connect the liquid inlet 111 and the liquid inlet end of the third flow channel 610, referring to Fig. 27The heat-conducting fluid enters the flow-guiding cavity 710 through the liquid inlet 111 and the liquid inlet port 302 and pushes the first blocking portion 721 along the third direction Z. The first blocking portion 721 is pushed away from the first wall 11 by the heat-conducting fluid and is separated from the first body 71, thereby connecting the flow-guiding cavity 710 and the first flow channel 301 of the first liquid cooling plate 30, so that the heat-conducting fluid enters the first flow channel 301 through the flow-guiding cavity 710 to regulate the temperature of the battery cell 20. At the same time, due to the heat-conducting fluid entering the flow-guiding cavity 710, the first blocking portion 721 moves away from the first wall 11 and is separated from the first body 71. The pressure of the heat-conducting fluid in the first sealing portion 721 is relatively large, and the fluid pressure applied to the first blocking portion 721 reaches the second pressure threshold, so that the heat-conducting fluid can apply sufficient thrust to the first blocking portion 721, so that the first blocking portion 721 drives the second blocking portion 722 to move away from the first wall 11 along the third direction Z and the second blocking portion 722 can expose at least part of the guide port 711, so as to connect the guide port 711 with the first port 612 (i.e., the liquid inlet end of the third flow channel 610), so that the heat-conducting fluid entering the guide cavity 710 A portion of the heat-conducting fluid enters the first flow channel 301 through the gap between the first blocking portion 721 and the first main body 71, and the other portion enters the third flow channel 610 through the guide port 711 and the first port 612. The heat-conducting fluid entering the third flow channel 610 enters the first liquid outlet flow channel through the first bending portion 611 away from the second flow channel plate 50, and enters the second flow channel 51 through the second port 613 (i.e., the liquid outlet end of the third flow channel 610), thereby forming a diversion of the heat-conducting fluid with a larger pressure, preventing the heat-conducting fluid from damaging the first liquid cooling plate 30, and improving the service life of the first liquid cooling plate 30. In addition, the first single plate 61 can cooperate with the first liquid cooling plate 30 and the second flow channel plate 50 to form temperature control on multiple surfaces of the battery cell 20, thereby improving the temperature control efficiency, so that the operating temperature of the battery cell 20 returns to a reasonable operating temperature range as soon as possible, ensuring the safety of the battery cell 20 and the battery pack 1, and improving the service life of the battery cell 20 and the battery pack 1.

[0129] Moreover, the structural design of the baffle 72 reciprocating along the third direction Z in the flow guide cavity 710 enables the first blocking portion 721 to fall back along the third direction Z and approach the first wall 11 when the fluid pressure applied by the heat transfer fluid to the first blocking portion 721 is lower than the second pressure threshold but higher than the first pressure threshold, and drives the second blocking portion 722 to reduce the opening of the flow guide port 711 and adjust the flow rate of the heat transfer fluid entering the third flow channel 610. When the fluid pressure applied to the first blocking portion 721 is equal to the first pressure threshold, it indicates that the electric The operating temperature of the battery cell 20 only exceeds the normal operating temperature by ±15°C. The first sealing portion 721 drives the second sealing portion 722 to move to the sealed flow guide port 711, so that the heat transfer fluid can only enter the first flow channel 301. When the fluid pressure on the first sealing portion 721 is less than the first pressure threshold, it indicates that the battery cell 20 is in the normal operating temperature range. The first sealing portion 721 forms a seal on the flow guide cavity 710, and there is no need to control the temperature of the battery cell 20 by the heat transfer fluid, thereby reducing energy consumption and improving temperature control efficiency.

[0130] In some embodiments, reference Fig. 22 The valve body 70 further includes a first elastic member 73. Along the third direction Z, one end of the first blocking portion 721 away from the second flow channel plate 50 is recessed to form a recessed portion 723. Figure 21 to Figure 25 The first main body 71 is connected to the limiting portion 712 at one end away from the second flow channel plate 50, and the first blocking portion 721 can move in the direction away from the first wall 11 along the third direction Z, so that the limiting portion 712 is embedded in the recessed portion 723. Specifically, refer to Fig.23 The first blocking portion 721 moves along the third direction Z in a direction away from the first wall 11, and the limiting portion 712 is embedded in the recessed portion 723. When the valve body 70 is not opened, the limiting portion 712 blocks the open end of the recessed portion 723. Fig. 22 The first elastic member 73 is arranged in the recessed portion 723, one end of the first elastic member 73 along the third direction Z abuts against the limiting portion 712, and the other end abuts against the recessed portion 723, the first blocking portion 721 moves away from the second flow channel plate 50 along the third direction Z, and the recessed portion 723 squeezes the first elastic member 73, when the fluid pressure applied to the first blocking portion 721 is lower than the first pressure threshold, the thrust force of the heat-conducting fluid applied to the first blocking portion 721 is smaller than the rebound force applied by the first elastic member 73 to the recessed portion 723, and the first blocking portion 721 moves toward the direction close to the second flow channel plate 50 under the action of the first elastic member 73, until the first blocking portion 721 blocks the guide cavity 710, thereby realizing the reciprocating movement of the baffle 72 in the guide cavity 710.

[0131] In some embodiments, reference Figure 11~Figure 13 as well as Figure 21 to Figure 25The valve body 70 also includes a guide column 74, one end of the guide column 74 along the third direction Z is connected to the recessed portion 723, and the other end is inserted into the limiting portion 712. The first elastic member 73 is sleeved on the guide column 74, and the guide column 74 can form support and guidance for the first elastic member 73, so that the first blocking portion 721 reciprocates along the third direction Z, thereby ensuring the sealing performance of the first blocking portion 721 in blocking the guide cavity 710.

[0132] In some embodiments, reference Figure 26~Figure 29 as well as Figure 32~Figure 40 The first liquid cooling plate 30 includes a plurality of connectors 31 and a plurality of sub-plates 32, referring to Figure 26~Figure 29 as well as Figures 34-36 A sub-channel 320 for the heat transfer fluid to flow is provided inside the sub-plate 32. Along the second direction Y, a plurality of sub-plates 32 are connected. The sub-channels 320 in the plurality of sub-plates 32 are connected along the second direction Y to form a first channel 301. Figure 26~Figure 29 as well as Fig.32 In the illustrated embodiment, the number of sub-plates 32 in the first liquid cooling plate 30 is two, that is, the first liquid cooling plate 30 includes a first sub-plate 321 and a second sub-plate 322, and sub-channels 320 are respectively provided inside the first sub-plate 321 and the second sub-plate 322, and the first sub-plate 321 and the second sub-plate 322 are connected along the second direction Y, and the sub-channels 320 are connected to form the first channel 301, and the first sub-plate 321 is inserted into the liquid inlet 111 through a connector 31 to connect the first channel 301 with the first branch channel 402, and the second sub-plate 322 is inserted into the liquid outlet 112 through a connector 31 to connect the first channel 301 with the liquid outlet channel 404, and the connector 31 is detachably connected to the first wall 11, and the first sub-plate 321 and the second sub-plate 322 are detachably connected. The arrangement of the connector 31 enables the sub-channel 320 in the first sub-plate 321 to communicate with the liquid inlet 111, and enables the sub-channel 320 in the second sub-plate 322 to communicate with the liquid outlet 112, so that the heat transfer fluid in the first branch channel 402 can enter the first channel 301 through the liquid inlet 111, and enter the liquid outlet channel 404 through the liquid outlet 112 to form a circulation. The detachable connection between the connector 31 and the first wall 11 can be driven by the movement of the connector 31 along the third direction Z to drive the sub-plate 32 connected to the connector 31, that is, the first sub-plate 322. The board 321 and the second sub-board 322 are away from the first wall 11 along the third direction Z, thereby releasing the restriction of the connector 31 on the first sub-board 321 and the second sub-board 322 in the third direction Z and the first direction X. The detachable connection structure design between the connected first sub-board 321 and the second sub-board 322 allows the first sub-board 321 and the second sub-board 322 to be separated along the second direction Y, thereby removing the first sub-board 321 and / or the second sub-board 322 from the box body 10 for subsequent maintenance, repair and replacement, thereby improving the safety and service life of the battery pack 1.

[0133] In some embodiments, reference Figure 25~Figure 27 , Fig.29 , Figure 32~Figure 35 , Fig.40 as well as Fig.42 , the plug connector 31 includes a plug connector portion 311, referring to Fig.25 , Figure 34~Figure 35 , Fig.40 as well as Fig.42 The plug-in portion 311 is provided with a first accommodating cavity 310 that penetrates the plug-in portion 311 along the third direction Z. Figure 26-27 , Fig.29 as well as Figure 32~Figure 35 The plug-in portion 311 includes a first plug-in portion 3111 and a second plug-in portion 3112. The first plug-in portion 3111 and the second plug-in portion 3112 are respectively provided with a first accommodating cavity 310. Fig. 27 , Fig.29 as well as Figures 37 and 38 , along the third direction Z, the liquid inlet port 302 is opened on the side of the first sub-plate 321 facing the first wall 11, one end of the first plug-in portion 3111 is inserted into the liquid inlet port 302, and the other end is inserted into the liquid inlet port 111, the first plug-in portion 3111 is detachably connected to the first wall 11, the liquid outlet port 303 is opened on the side of the second sub-plate 322 facing the first wall 11, one end of the second plug-in portion 3112 is inserted into the liquid outlet port 303, and the other end is inserted into the liquid outlet port 112, the second plug-in portion 3112 is detachably connected to the first wall 11, refer to Fig.25 and Fig. 27 The valve body 70 is disposed in the first accommodation cavity 310 of the first plug-in portion 3111. Along the first direction X, a flow guide opening 3113 communicating with the first accommodation cavity 310 and the flow guide port 711 is provided on one side of the first plug-in portion 3111 facing the first single plate 61. The valve body 70 is disposed in the first plug-in portion 3111 to ensure the installation stability of the valve body 70 in the plug-in component 31. When the fluid pressure of the valve body 70 reaches the second pressure threshold, the heat transfer fluid entering the valve body 70 can enter the first single plate 61 through the flow guide opening 3113 and the flow guide port 711.

[0134] In some embodiments, reference Fig.25 , Fig. 27 , Fig.35 as well as Fig.40The connector 31 also includes a connecting portion 312 and a connecting rod 313. Along the second direction Y, a connecting portion 312 is respectively provided on the outer sides of the opposite ends of the first liquid cold plate 30. The connecting portion 312 is connected to the adjacent plug-in portion 311 through the connecting rod 313. The connecting portion 312 can drive the connected plug-in portion 311 to move along the third direction Z through the connecting rod 313, so that the plug-in portion 311 is separated from the first wall 11. Specifically, there are two connecting parts 312, one connecting part 312 is arranged on the outer side of one end of the first sub-board 321 away from the second sub-board 322 along the second direction Y, and is connected to the first plug-in part 3111 through a connecting rod 313, and the other connecting part 312 is arranged on the outer side of one end of the second sub-board 322 away from the first sub-board 321 along the second direction Y, and is connected to the second plug-in part 3112 through a connecting rod 313. When the plug-in part 311 and the first wall 11 are separated, the connecting part 312 can be moved so that the connecting part 312 is away from the first wall 11 along the third direction Z. The connecting part 312 drives the connected plug-in part 311 to move along the third direction Z through the connecting rod 313, and then drives the sub-board 32 connected to the plug-in part 311 to move along the third direction Z until the plug-in part 311 is separated from the first wall 11, thereby improving the convenience and efficiency of separation and avoiding the situation where the sub-board 32 is damaged due to direct separation of the plug-in part 311 and the first wall 11.

[0135] In some embodiments, reference Fig. 27 and Fig.35 The first liquid cooling plate 30 has first through holes 304 connected to the first flow channel 301 at opposite ends along the second direction Y, and the connecting rod 313 is inserted into the first through hole 304 and can move in the first through hole 304 along the third direction Z. Fig.25 , Fig. 27 , Fig.35 as well as Fig.40 A shielding portion 3114 is provided on one side of the plug-in portion 311 adjacent to the connecting portion 312 along the second direction Y, and the shielding portion 3114 extends along the third direction Z and shields the first through hole 304. The shielding portion 3114 can shield and block the first through hole 304 to prevent the heat transfer fluid entering the first accommodating cavity 310 from leaking to the outside of the first liquid cooling plate 30 through the first through hole 304, thereby ensuring the safety of the battery pack 1.

[0136] In some embodiments, reference Fig.42 A sealing ring 3115 is sleeved on the plug-in part 311. Specifically, a sealing ring 3115 is sleeved on the first plug-in part 3111 to form a seal between the first plug-in part 3111 and the liquid inlet 111. A sealing ring 3115 is sleeved on the second plug-in part 3112 to form a seal between the second plug-in part 3112 and the liquid outlet 112.

[0137] In some embodiments, reference Fig.25 , Fig. 27 , Fig.29 , Figure 34~Figure 35 as well as Fig.42 The first liquid cooling plate 30 further includes a second elastic member 33, referring to Fig. 27 , Figure 32~Figure 35 as well as Figure 37-38 The first liquid cooling plate 30 is provided with a crimping portion 305 at two opposite ends along the second direction Y, and the crimping portion 305 is provided with a first slot 3051 on one side facing the first wall 11 along the third direction Z. Fig. 27 and Fig.35 , along the third direction Z, the connecting portion 312 is inserted into the first slot 3051, referring to Fig.35 The connecting portion 312 is provided with a second accommodating cavity 3120 penetrating the connecting portion 312. The connecting portion 312 penetrates the second flow channel plate 50 along the third direction Z. Fig.42 Along the third direction Z, the end of the connecting portion 312 adjacent to the first wall 11 is internally connected with a receiving portion 3121, and the receiving portion 3121 abuts against the first wall 11, referring to Fig.35 The second elastic member 33 is arranged in the second accommodating cavity 3120, one end of the second elastic member 33 along the third direction Z is inserted into the first slot 3051, and the other end is abutted against the receiving portion 3121. Along the third direction Z, the connecting portion 312 can move in the first slot 3051 and squeeze the second elastic member 33 through the receiving portion 3121 to drive the crimping portion 305 away from the first wall 11. During the disassembly of the first liquid cooling plate 30, a tool can be inserted into the gap between the receiving portion 3121 and the first wall 11 and the receiving portion 3121 can be pushed upward, so that the receiving portion 3121 squeezes the second elastic member 33, and the second elastic member 33 pushes the crimping portion 305 away from the first wall 11 along the third direction Z. At the same time, the connecting portion 312 drives the connected plug-in portion 311 away from the first wall 11 along the third direction Z through the connecting rod 313. The provision of the second elastic member 33 can protect the crimping portion 305, avoid damage to the first liquid cooling plate 30 during the disassembly process, and improve the reuse rate of the disassembled first liquid cooling plate 30.

[0138] In some embodiments, reference Fig.25 , Fig. 27 , Fig.29 , Figure 32~Figure 35 as well as Fig.41 The first liquid cooling plate 30 further includes a second elastic member 33 and a support member 34, referring to Fig. 27 , Figure 32~Figure 35 as well as Figure 37-38 The first liquid cooling plate 30 is provided with a crimping portion 305 at two opposite ends along the second direction Y, and the crimping portion 305 is provided with a first slot 3051 on one side facing the first wall 11 along the third direction Z. Fig. 27 and Fig.35, along the third direction Z, the connecting portion 312 is inserted into the first slot 3051, referring to Fig.35 The connecting portion 312 is provided with a second accommodating cavity 3120 penetrating the connecting portion 312. Fig. 27 The support member 34 passes through the second flow channel plate 50 along the third direction Z and is arranged on the first wall 11. The connecting portion 312 is arranged on the side of the support member 34 facing away from the first wall 11. The second elastic member 33 is arranged in the second accommodating cavity 3120. One end of the second elastic member 33 is inserted into the first slot 3051, and the other end abuts against the support member 34. Along the third direction Z, the support member 34 can move in the direction away from the first wall 11, and can drive the connecting portion 312 to move in the first slot 3051 and squeeze the second elastic member 33. The setting of the support member 34 allows a tool to be inserted into the gap between the support member 34 and the first wall 11 when disassembling the first liquid cooling plate 30, and then moved in the third direction Z away from the first wall 11, thereby squeezing the second elastic member 33 through the support member 34 to push the crimping portion 305, so as to drive the connecting portion 312 to move away from the first wall 11 along the third direction Z. The connecting portion 312 drives the plug-in portion 311 to move away from the first wall along the third direction Z through the connecting rod 313 until the plug-in portion 311 is separated from the first wall 11, so that the subsequently connected sub-plate 32 can be separated along the second direction Y, thereby improving the convenience of disassembly of the first liquid cooling plate 30.

[0139] In some embodiments, reference Fig.25 and Fig.41 The support member 34 includes a second body 341, and along the third direction Z, the second body 341 is arranged on the first wall 11, and a slot 342 is provided on the second body 341 facing the first wall 11. The second body 341 is connected to the first protrusion 113 on the first wall 11 through the slot 342. One end of the second elastic member 33 along the third direction Z is inserted into the first slot 3051, and the other end is in contact with the second body 341. The second body 341 can move in a direction away from the first wall 11. The support member 34 drives the connecting part 312 to move in the first slot 3051 and squeeze the second elastic member 33 through the second body 341. The structural design of the support member 34 being connected to the first protrusion 113 by a slot, and there being a gap between the second body 341 and the first protrusion 113 along the third direction Z, thereby improving the convenience of disassembly of the first liquid cooling plate 30 and ensuring the convenience of assembly between the first liquid cooling plate 30 and the first wall 11.

[0140] In some embodiments, reference Fig.41The second body 341 is provided with an exhaust hole 3410 which penetrates the second body 341 along the third direction Z. The exhaust hole 3410 can ensure the consistency of the pressure inside and outside the crimping part 305 when the connecting part 312 moves in the first slot 3051 of the crimping part 305, thereby ensuring the smoothness of the connecting part 312 moving in the first slot 3051 along the third direction Z, ensuring the smoothness of the connecting part 312 driving the plug-in part 311 to move along the third direction Z through the connecting rod 313, and ensuring the smoothness of the removal of the first liquid cold plate 30.

[0141] In some embodiments, reference Fig.25 and Fig.41 The support member 34 also includes a limiting portion 343. Along the first direction X, a limiting portion 343 is respectively provided at the opposite ends of the second main body 341. A guide cavity 3430 is defined between the two limiting portions 343. Along the third direction Z, the limiting portion 343 penetrates the second flow channel plate 50, and the crimping portion 305 is inserted into the guide cavity 3430. The two limiting portions 343 cooperate to form a guide for the crimping portion 305 to move along the third direction Z, and the two limiting portions 343 cooperate to limit the crimping portion 305 along the first direction X, thereby ensuring the assembly stability of the first liquid cooling plate 30 in the box body 10.

[0142] Reference Fig. 9 and Fig.10 The second flow channel plate 50 is provided with first insertion openings 54 at two opposite ends along the second direction Y, and the first insertion openings 54 penetrate the second flow channel plate 50 along the third direction Z.

[0143] In some embodiments, reference Fig.26 , Fig.28 , Figure 32~Figure 34 , Fig.36 as well as Figure 43~Figure 44 The first liquid cooling plate 30 further includes a connector 35, which includes a third body 351. The third body 351 penetrates the second flow channel plate 50 along the third direction Z and is inserted into the first wall 11. The third body 351 is disposed between two adjacent sub-plates 32 along the second direction Y. The third body 351 is provided with a second through hole 3511 penetrating the third body 351 along the second direction Y. The opposite ends of the third body 351 along the second direction Y are respectively connected to the adjacent sub-plates 32 by snapping, and the sub-flow channels 320 in the two adjacent sub-plates 32 are connected through the second through hole 3511. The provision of the connector 35 can realize a detachable connection between two adjacent sub-plates 32 along the second direction Y, thereby improving the assembly convenience of the first liquid cooling plate 30.

[0144] In some embodiments, reference Figure 30~Figure 31, along the third direction Z, the first wall 11 is provided with a second slot 1131 at one end facing the second flow channel plate 50, the second slot 1131 includes two slot walls 1132 arranged opposite to each other along the second direction Y, and along the third direction Z, the third body 351 is provided with a clamping portion 3512 protruding from one end adjacent to the first wall 11, the clamping portion 3512 is inserted into the second slot 1131 and is clamped and connected to the slot wall 1132, specifically, refer to Fig.31 , a bayonet 1133 is provided on the groove wall 1132, referring to Fig. 9 and Fig.10 A fourth socket 57 is provided on the second flow channel plate 50 and passes through the second flow channel plate 50 along the third direction Z. The clamping portion 3512 passes through the fourth socket 57 along the third direction Z and is inserted into the second slot 1131 and is clamped and connected with the clamping port 1133, thereby ensuring the assembly stability between the third body 351 and the first wall 11 and improving the disassembly convenience between the third body 351 and the first wall 11.

[0145] In some embodiments, reference Fig.26 , Fig.28 , Fig.36 , Fig.43 as well as Fig.45 The connector 35 further includes a clamping member 352. At least one clamping member 352 is respectively provided at the opposite ends of the third body 351 along the second direction Y. The clamping member 352 is provided with a third through hole 3521 that passes through the clamping member 352 along the second direction Y. One end of the clamping member 352 is inserted into the second through hole 3511 of the third body 351, and the other end is clamped and connected with the adjacent sub-plate 32. The sub-channels 320 in the two adjacent sub-plates 32 are connected with the second through hole 3511 through the third through hole 3521. The provision of the clamping member 352 facilitates the clamping connection between the third body 351 and the sub-plate 32, thereby ensuring the assembly stability between the third body 351 and the sub-plate 32, and improving the disassembly convenience between the third body 351 and the sub-plate 32.

[0146] In some embodiments, reference Fig.28 , Fig.36 , Fig.43 and Fig.45 The end of the clamping member 352 away from the third body 351 along the second direction Y is provided with a spring piece 3522. The setting of the spring piece 3522 facilitates the assembly and disassembly between the sub-board 32 and the third body 351. Specifically, refer to Fig.28 as well as Fig.36 A snap-fitting portion cooperating with the spring piece 3522 is provided at one end of the sub-board 32 adjacent to the third main body 351 along the second direction Y. The spring piece 3522 cooperates with the snap-fitting portion to form a snap-fit ​​connection between the third main body 351 and the sub-board 32. The snap-fitting portion and the spring piece 3522 can be arranged in an arc shape to facilitate the separation of the spring piece 3522 from the snap-fitting portion.

[0147] In some embodiments, reference Fig.33 and Fig.34 The number of sub-plates 32 in the first liquid cooling plate 30 is more than three, including a first sub-plate 321, a second sub-plate 322 and at least one third sub-plate 323, as shown in FIG. Fig.33 and Fig.34 In the illustrated embodiment, the number of the third sub-board 323 is one, and the first sub-board 321 , the third sub-board 323 and the second sub-board 32 are sequentially connected along the second direction Y through the connecting member 35 .

[0148] The technical solutions provided by the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, the battery pack having a first direction, a second direction and a third direction intersecting each other, characterized in that: The battery pack comprises: A box body, with a containing cavity inside, the box body comprising a first wall and a second wall arranged opposite to each other along the third direction, and a liquid inlet is formed at one end of the first wall along the second direction; A battery cell is disposed in the accommodating cavity; A plurality of first liquid cooling plates are arranged in the accommodating cavity at intervals along the first direction, the first liquid cooling plates abut against the battery cells along the first direction, a first flow channel for the flow of a heat-conducting fluid is provided inside the first liquid cooling plates, and a liquid inlet port communicating with the first flow channel is provided on a side of the first liquid cooling plates facing the first wall along the third direction, and a liquid inlet port of the first liquid cooling plates is arranged opposite to a liquid inlet port; A first flow channel plate is arranged on a side of the first wall facing away from the second wall, and a liquid inlet flow channel, a plurality of first branch flow channels and a plurality of second branch flow channels are arranged on a side of the first flow channel plate facing the first wall, and one of the first branch flow channels is connected to one of the liquid inlets; Along the first direction, multiple first branch channels are arranged at intervals, the liquid inlet channel is connected to the adjacent first branch channel, the second branch channel is arranged between two adjacent first branch channels, and the two adjacent first branch channels are connected through the second branch channel. The number of the second branch channels between two adjacent first branch channels decreases from one end close to the liquid inlet channel to the end far away from the liquid inlet channel.

2. The battery pack according to claim 1, characterized in that: The first flow channel plate includes a plurality of first filling parts; Along the first direction, a plurality of the first filling parts are arranged at intervals, at least one first filling part is arranged between two adjacent first branch flow channels, and a first filling cavity for accommodating fillers is arranged inside the first filling part; The first filling portion has a size S mm along the second direction. Along the first direction, the size S of the plurality of first filling portions increases from an end close to the liquid inlet channel to an end away from the liquid inlet channel.

3. The battery pack according to claim 2, characterized in that: The first flow channel plate further includes a second filling portion; The second filling part is disposed between two adjacent first branch flow channels along the first direction, and a second filling cavity for accommodating fillers is disposed inside the second filling part; Along the second direction, the second branch channel is defined between the first filling part and the adjacent second filling part, and the second branch channel is defined between two adjacent second filling parts; Along the first direction, the number of the second filling parts between two adjacent first branch channels decreases from an end close to the liquid inlet channel to an end far from the liquid inlet channel.

4. The battery pack according to claim 1, wherein: A liquid outlet is formed at one end of the first wall away from the liquid inlet along the second direction; The first flow channel plate is provided with a liquid outlet flow channel on one side thereof along the third direction toward the first wall, and the liquid outlet is communicated with the liquid outlet flow channel; Along the second direction, the liquid inlet channel and the liquid outlet channel are spaced apart, and the first branch channel and the liquid outlet channel are spaced apart.

5. The battery pack according to claim 4, characterized in that: The battery pack also includes a second flow channel plate and a second liquid cooling plate; The second flow channel plate is arranged on a side of the first wall facing the second wall, a second flow channel for heat transfer fluid to flow is arranged on a side of the second flow channel plate facing the second wall, and the battery cell and the first liquid cooling plate are both arranged on the second flow channel plate; The second liquid cooling plate is arranged on the second flow channel plate, and includes a first single plate abutting against the battery cell along the second direction. A third flow channel for the flow of heat-conducting fluid is provided inside the first single plate. The liquid inlet end of the third flow channel is arranged opposite to the liquid inlet and can be connected to the liquid inlet, and the liquid outlet end is connected to the second flow channel.

6. The battery pack according to claim 5, characterized in that: The battery pack also includes a valve body; The valve body is inserted into the liquid inlet port to block the liquid inlet and the first flow channel, and the valve body and the first single plate are arranged along the first direction to block the liquid inlet and the liquid inlet end of the third flow channel; When the pressure applied to the valve body reaches a preset first pressure threshold, the liquid inlet and the first flow channel can be connected. When the pressure applied to the valve body reaches a preset second pressure threshold, the liquid inlet and the liquid inlet end of the third flow channel can be connected. The first pressure threshold is less than the second pressure threshold.

7. The battery pack according to claim 6, characterized in that: The valve body comprises a first main body and a baffle; The first body is inserted into the liquid inlet port, a flow guide cavity is provided inside the first body and penetrates the first body along the third direction, and a flow guide port communicating with the flow guide cavity is provided on one side of the first body facing the first single board along the first direction; The baffle is disposed in the guide cavity, and includes a first blocking portion and a second blocking portion connected along the third direction, the first blocking portion can block the guide cavity to block the liquid inlet and the first flow channel, and the second blocking portion can block the guide port to block the liquid inlet and the liquid inlet end of the third flow channel; The baffle can reciprocate in the guide cavity along the third direction, and when the pressure on the first blocking portion reaches the first pressure threshold, the liquid inlet and the first flow channel can be connected; When the pressure on the first blocking portion reaches the second pressure threshold, the liquid inlet and the first flow channel can be connected, and the second blocking portion can be driven to expose at least a portion of the guide port to connect the liquid inlet and the liquid inlet end of the third flow channel.

8. The battery pack according to claim 7, characterized in that: The valve body further comprises a first elastic member; Along the third direction, one end of the first blocking portion away from the second flow channel plate is recessed to form a recessed portion, and one end of the first main body away from the second flow channel plate is in contact with a limiting portion; The first blocking portion can move along the third direction in a direction away from the first wall, so that the limiting portion is embedded in the recessed portion; The first elastic member is disposed in the recessed portion, one end of the first elastic member along the third direction abuts against the limiting portion, and the other end abuts against the recessed portion; The first blocking portion is away from the second flow channel plate along the third direction, and the recessed portion presses the first elastic member.

9. The battery pack according to claim 8, characterized in that: The valve body further comprises a guide column, one end of which along the third direction is connected to the recessed portion, and the other end of which is inserted into the limiting portion, and the first elastic member is sleeved on the guide column.

10. The battery pack according to claim 6, wherein: A liquid outlet is formed at one end of the first wall away from the liquid inlet along the second direction, and along the third direction, the liquid inlet is connected to the first branch flow channel, and the liquid outlet is connected to the liquid outlet flow channel; Along the third direction, a liquid outlet port communicating with the first flow channel is formed on a surface of the first liquid cooling plate facing the first wall, and the liquid outlet port is arranged opposite to the liquid outlet.

11. The battery pack according to claim 10, characterized in that: The second liquid cooling plate also includes a second single plate. Along the second direction, the second single plate is arranged opposite to the first single plate and respectively abuts against the battery cells. A fourth flow channel for the flow of heat-conducting fluid is provided inside the second single plate. The liquid inlet end of the fourth flow channel is connected to the second flow channel, and the liquid outlet end is connected to the liquid outlet.

12. The battery pack according to claim 11, characterized in that: The second liquid cooling plate also includes a third single plate; Along the second direction, a plurality of the battery cells are arranged between the first single board and the second single board, and one third single board is arranged between two adjacent battery cells; A fifth flow channel for the flow of heat-conducting fluid is provided inside the third single plate, and a liquid inlet end and a liquid outlet end of the fifth flow channel are respectively connected to the second flow channel.

13. The battery pack according to claim 12, characterized in that: The battery cell comprises a first surface and a second surface arranged opposite to each other along the first direction, a third surface and a fourth surface arranged opposite to each other along the second direction, and a fifth surface and a sixth surface arranged opposite to each other along the third direction, the first surface, the third surface, the second surface and the fourth surface are sequentially connected end to end to form a shell structure with two open ends, the fifth surface and the sixth surface cover the two open ends respectively, and the first surface and the second surface are surfaces with the largest surface areas; Along the first direction, the second liquid cooling plate abuts against the first surface or the second surface; Along the second direction, the first single board abuts against the third surface of the adjacent battery cell, the second single board abuts against the fourth surface of the adjacent battery cell, and of two adjacent battery cells, the third surface of one battery cell and the fourth surface of the other battery cell abut against the third single board respectively; Along the third direction, the fifth surface of the battery cell can be in direct contact with the heat transfer fluid in the second flow channel.

14. The battery pack according to claim 13, wherein: Along the third direction, opposite ends of the first single plate are bent to form first bent portions, a liquid inlet end and a liquid outlet end of the third flow channel are respectively opened on the first bent portions adjacent to the second flow channel plate, one of the first bent portions abuts against the fifth surface of the battery cell, and the other first bent portion abuts against the sixth surface; Along the third direction, opposite ends of the second single plate are respectively bent to form second bent portions, a liquid inlet end and a liquid outlet end of the fourth flow channel are respectively opened on the second bent portions adjacent to the second flow channel plate, one of the second bent portions abuts against the fifth surface of the battery cell, and another second bent portion abuts against the sixth surface of the adjacent battery cell; Along the third direction, a supporting portion is provided at one end of the third single plate, and a covering portion is provided at the other end, the liquid inlet end and the liquid outlet end of the fifth flow channel are respectively opened on the supporting portion, the supporting portion abuts against the fifth surface of the adjacent battery cell, and the covering portion abuts against the sixth surface of the adjacent battery cell.

15. The battery pack according to claim 10, wherein: The first liquid cooling plate includes a plurality of connectors, and includes a first sub-board and a second sub-board. The first sub-board and the second sub-board are respectively provided with sub-flow channels for the flow of heat transfer fluid. The first sub-board and the second sub-board are connected along the second direction, and the sub-flow channels are connected to form the first flow channel. The first sub-board is inserted into the liquid inlet through the plug-in component to connect the first flow channel with the first branch flow channel, and the second sub-board is inserted into the liquid outlet through the plug-in component to connect the first flow channel with the liquid outlet flow channel; The plug-in component is detachably connected to the first wall, and the first sub-board is detachably connected to the second sub-board.

16. The battery pack according to claim 15, characterized in that: The plug connector comprises a plug part, and a first accommodating cavity is provided inside the plug part and penetrates the plug part along the third direction; The plug-in portion comprises a first plug-in portion and a second plug-in portion, wherein the first plug-in portion and the second plug-in portion are respectively provided with the first accommodating cavity; Along the third direction, the liquid inlet port is opened on a side of the first sub-board facing the first wall, one end of the first plug-in portion is inserted into the liquid inlet port, and the other end is inserted into the liquid inlet port, and the first plug-in portion is detachably connected to the first wall; Along the third direction, the liquid outlet port is provided on a side of the second sub-board facing the first wall, one end of the second plug-in portion is inserted into the liquid outlet port, and the other end is inserted into the liquid outlet port, and the second plug-in portion is detachably connected to the first wall; The valve body is disposed in the first accommodating cavity of the first plug-in portion. Along the first direction, a flow guide opening communicating with the first accommodating cavity and the flow guide port is formed on one side of the first plug-in portion facing the first single plate.

17. The battery pack according to claim 16, wherein: The plug connector also includes a connecting portion and a connecting rod; Along the second direction, the outer sides of the two opposite ends of the first liquid cooling plate are respectively provided with a connecting portion, and the connecting portion is connected to the adjacent plug-in portion through the connecting rod; The connecting portion can drive the connected plug-in portion to move along the third direction through a connecting rod, so that the plug-in portion is separated from the first wall.

18. The battery pack according to claim 17, wherein: The first liquid cooling plate is provided with first through holes communicating with the first flow channel at opposite ends along the second direction, and the connecting rod is inserted into the first through hole and can move in the first through hole along the third direction; A shielding portion is disposed on one side of the plug-in portion adjacent to the connecting portion along the second direction, and the shielding portion extends along the third direction and shields the first through hole.

19. The battery pack according to claim 18, characterized in that: The first liquid cooling plate further includes a second elastic member; The first liquid cooling plate is provided with a crimping portion at two opposite ends along the second direction, and a first slot is provided on a surface of the crimping portion facing the first wall along the third direction; Along the third direction, the connecting portion is inserted into the first slot, a second accommodating cavity penetrating the connecting portion is provided inside the connecting portion, the connecting portion passes through the second flow channel plate, an end of the connecting portion adjacent to the first wall is internally connected with a receiving portion, the receiving portion abuts against the first wall, the second elastic member is disposed in the second accommodating cavity, one end of the second elastic member is inserted into the first slot, and the other end abuts against the receiving portion; Along the third direction, the connecting portion can move in the first slot and press the second elastic member through the receiving portion to drive the crimping portion away from the first wall.

20. The battery pack according to claim 18, wherein: The first liquid cooling plate further includes a second elastic member and a supporting member; The first liquid cooling plate is provided with a crimping portion at two opposite ends along the second direction, and a first slot is provided on a surface of the crimping portion facing the first wall along the third direction; Along the third direction, the connecting portion is inserted into the first slot, a second accommodating cavity penetrating the connecting portion is provided inside the connecting portion, the supporting member passes through the second flow channel plate and is arranged on the first wall, the connecting portion is arranged on a side of the supporting member away from the first wall, the second elastic member is arranged in the second accommodating cavity, one end of the second elastic member is inserted into the first slot, and the other end abuts against the supporting member; Along the third direction, the supporting member can move in a direction away from the first wall, and can drive the connecting portion to move in the first slot and press the second elastic member.

21. The battery pack according to claim 20, characterized in that: The support member includes a second body; Along the third direction, a first protrusion is provided on a side of the first wall facing the second flow channel plate, the second body is provided on the first wall, a clamping groove is provided on a side of the second body facing the first wall, and the second body is clamped and connected with the first protrusion through the clamping groove; The liquid inlet and the liquid outlet are arranged at two opposite ends of the first protrusion along the second direction; Along the third direction, one end of the second elastic member is inserted into the first slot, and the other end is abutted against the second main body. The second main body can move away from the first wall. The support member drives the connecting part to move in the first slot and squeeze the second elastic member through the second main body.

22. The battery pack according to claim 21, characterized in that: The support member further includes a limiting portion; Along the first direction, a limiting portion is respectively provided at the opposite ends of the second main body, and a guide cavity is defined between the two limiting portions. Along the third direction, the limiting portion penetrates the second flow channel plate, and the crimping portion is inserted into the guide cavity. The two limiting portions cooperate to form a guide for the crimping portion to move along the third direction.

23. The battery pack according to claim 21, characterized in that: The second flow channel plate is provided with a plurality of second protrusions on one side thereof protruding toward the first wall along the third direction, and the first protrusion is embedded between two adjacent second protrusions along the second direction; A plurality of third protrusions are protruded from a surface of the second flow channel plate away from the first wall along the third direction, and the second flow channel is defined between two adjacent third protrusions along the second direction; The first liquid cooling plate abuts against the third protrusion along the third direction.

24. The battery pack according to claim 15, characterized in that: The first liquid cooling plate further includes a connecting member, and the connecting member includes a third body; The third body penetrates the second flow channel plate along the third direction and is inserted into the first wall, and the third body is arranged between the first sub-plate and the second sub-plate; Along the second direction, a second through hole is opened on the third body and penetrates the third body. One end of the third body is connected to the first sub-board by a clip, and the other end is connected to the second sub-board by a clip. The sub-channels in the first sub-board and the second sub-board are connected through the second through hole.

25. The battery pack according to claim 24, characterized in that: Along the third direction, a first protrusion is provided on one side of the first wall facing the second flow channel plate, and a second slot is provided on one end of the first protrusion facing the second flow channel plate. The second slot includes two slot walls that are oppositely arranged along the second direction; Along the third direction, a clamping portion is protruded from one end of the third body adjacent to the first wall, and the clamping portion is inserted into the second slot and clamped and connected with the slot wall.

26. The battery pack according to claim 25, characterized in that: The connecting piece also includes a clamping piece; Along the second direction, at least one of the clamping members is respectively disposed at two opposite ends of the third body, the clamping member is inserted into the second through hole, a third through hole penetrating the clamping member is formed on the clamping member, and the third through hole is connected to the second through hole; Along the second direction, the clamping member disposed at one end of the third body is clamped and connected to the first sub-board, and the clamping member disposed at the other end of the third body is clamped and connected to the second sub-board; The sub-channels in the first sub-plate and the second sub-plate are in communication with each other through the third through hole and the second through hole.

27. The battery pack according to claim 15, characterized in that: The first liquid cooling plate includes a first sub-plate, a second sub-plate and at least one third sub-plate, and the first sub-plate, the at least one third sub-plate and the second sub-plate are connected along the second direction.

28. An electrical equipment, characterized in that: Comprising a battery pack as described in any one of claims 1 to 27, the battery pack provides the electrical energy required for the electrical equipment to work.

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