Battery pack and power device

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 on a first wall of a box body, a first liquid cooling plate is abutted against a battery cell in a first direction, and a first single plate abutted against the battery cell in a second direction, and a valve body is inserted into a liquid inlet port of the first liquid cooling plate to block the liquid inlet port and the second flow channel. The valve body and the first single plate are arranged in the second direction to block the liquid inlet port and the liquid inlet end of the third flow channel. When the pressure on the valve body reaches a preset first pressure threshold, the liquid inlet port and the second flow channel can be connected. When the pressure on the valve body reaches a preset second pressure threshold, the liquid inlet port 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, so that when the flow rate of the heat-conducting fluid entering the first liquid cooling plate is too high, it can be diverted through the first single plate to reduce the pressure of the heat-conducting fluid, and the temperature uniformity of the battery cell can be improved to ensure the safety of the battery pack.

Description

Technical Field

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

[0002] In existing battery packs, the temperature of battery cells is regulated by passing heat-conducting fluid into the liquid cooling plate. When an abnormal situation occurs in the battery pack and the temperature of the battery cells is too high, it is necessary to increase the amount of heat-conducting fluid introduced to reduce the temperature of the battery cells as quickly as possible. However, when a large amount of heat-conducting fluid is introduced in a short period of time, the fluid pressure of the heat-conducting fluid on the liquid cooling plate is relatively large, which can easily cause damage to the liquid cooling plate, shorten the service life of the liquid cooling plate, and affect the temperature regulation effect of the battery cells, thereby 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 that when the fluid pressure of the heat-conducting fluid introduced into the liquid cooling plate of the current battery pack is too high, it affects the service life of the liquid cooling plate and the safety of the 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 first flow channel plate is arranged on a side of the first wall facing the second wall, and a first flow channel is provided on a side of the first flow channel plate facing the second wall; a battery cell is arranged on the first flow channel plate; a first liquid cooling plate is arranged on the first flow channel plate and abuts against the battery cell along the first direction, a second flow channel for heat transfer fluid to flow inside the first liquid cooling plate, and a liquid inlet port connected to the second flow channel is provided on a side of the first liquid cooling plate facing the first wall along the third direction, The liquid inlet port is arranged opposite to the liquid inlet; the second liquid cooling plate is arranged on the first flow channel plate, including 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 arranged inside the first single plate, the liquid inlet end of the third flow channel faces the liquid inlet, and the liquid outlet end of the third flow channel is connected with the first flow channel; a valve body is inserted into the liquid inlet port to block the liquid inlet and the second flow channel, 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 on the valve body reaches a preset first pressure threshold, the liquid inlet and the second flow channel can be connected, and when the pressure on 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.

[0005] Optionally, the valve body includes a first main body and a baffle; the first main body is inserted into the liquid inlet port, a guide cavity is provided inside the first main body and passes through the first main body along the third direction, and a guide port connected to the guide cavity is opened on one side of the first main body toward the first single plate along the first direction; the baffle is arranged in the guide cavity, the baffle includes a first blocking portion and a second blocking portion connected along the third direction, the first blocking portion can block the guide cavity, and the second blocking portion can block the guide port; the baffle can reciprocate along the third direction in the guide cavity, and when the pressure on the first blocking portion reaches the first pressure threshold, the liquid inlet and the second flow channel can be connected; when the pressure on the first blocking portion reaches the second pressure threshold, the liquid inlet and the second flow channel can be connected, and the second blocking portion can be driven to expose at least part of the guide port to connect the liquid inlet with the liquid inlet end of the third flow channel.

[0006] 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 first flow channel plate is recessed to form a recessed portion, and the end of the first main body facing away from the first flow channel plate is connected with a first limiting portion, and the first limiting portion is embedded in the recessed portion; the first elastic member is arranged in the recessed portion, and one end of the first elastic member along the third direction abuts against the first limiting portion, and the other end abuts against the recessed portion; the first blocking portion moves away from the first flow channel plate along the third direction, and the recess squeezes the first elastic member.

[0007] 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 first limiting portion, and the first elastic member is sleeved on the guide column.

[0008] Optionally, the battery pack also includes a second flow channel plate, which is arranged on a side of the first wall facing away from the second wall, and a fourth flow channel is arranged on the side of the second flow channel plate facing the first wall; a liquid outlet is provided at one end of the first wall facing away from the liquid inlet along the second direction, and the liquid inlet is connected to the fourth flow channel; along the third direction, a liquid outlet port connected to the second flow 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.

[0009] 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 fifth flow channel for the flow of heat-conducting fluid is provided inside the second single plate. The liquid inlet end of the fifth flow channel is connected to the first flow channel, and the liquid outlet end of the fifth flow channel is connected to the liquid outlet.

[0010] The second single board can cooperate with the first single board to clamp and fix the battery cell along the second direction, and can adjust and control the temperature of two surfaces of the battery cell relatively arranged along the second direction, so that the battery cell is at a suitable working temperature, thereby improving the use efficiency and service life of the battery cell.

[0011] 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 sixth flow channel for the flow of heat-conducting fluid is provided inside the third single board, and the liquid inlet and outlet ends of the sixth flow channel are respectively connected to the first flow channel.

[0012] The setting of the third single board enables the first single board, the second single board and the third single board to cooperate to clamp and fix multiple battery cells along the second direction, thereby ensuring the installation stability of the battery cells in the box, and can regulate the temperature of the two sides of each battery cell that are relatively set along the second direction, thereby improving the use efficiency and service life of the battery cells.

[0013] 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 connected end to end in sequence 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; the first liquid cooling plate includes a first sub-plate and a second sub-plate, the first sub-plate is connected to the second sub-plate along the second direction, and the first sub-plate and the second sub-plate are respectively abutted against the first surface or the second surface along the first direction; along the second direction, the first single plate abuts against the third surface of the adjacent battery cell, and the second single plate 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 are respectively abutted against the third single plate; along the third direction, the fifth surface of the battery cell can be in direct contact with the heat transfer fluid in the first flow channel.

[0014] Optionally, along the third direction, the opposite ends of the first single plate are bent to form first bending portions, and 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 first 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 to form second bending portions, and the liquid inlet end and the liquid outlet end of the fifth flow channel are respectively opened on the second bending portion adjacent to the first 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 sixth 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.

[0015] Optionally, the first liquid cooling plate includes a connector, a first sub-board and a second sub-board; the first sub-board and the second sub-board are respectively provided with sub-channels for the flow of heat-conducting fluid, and along the second direction, the first sub-board is connected to the second sub-board, and the sub-channels are connected to form the second channel; the first sub-board is inserted into the liquid inlet through the connector, and the second sub-board is inserted into the liquid outlet through the connector to connect the fourth channel with the second channel; the connector and the first wall are detachably connected, and the first sub-board and the second sub-board are detachably connected.

[0016] 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.

[0017] Optionally, the connector includes a plug-in portion, and the plug-in portion includes a first plug-in portion and a second plug-in portion spaced apart along the second direction; 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, and the other end is inserted into the liquid inlet port, a first accommodating cavity penetrating the first plug-in portion is provided inside the first plug-in portion to connect the liquid inlet and 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 at The second sub-board faces one side of the first wall, one end of the second plug-in portion is inserted into the liquid outlet, and the other end is inserted into the liquid outlet port. The second plug-in portion is provided with a first accommodating cavity that passes through the second plug-in portion to connect the liquid outlet and 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, the first plug-in portion is provided with a guide opening that is connected to the first accommodating cavity on one side of the first single board, and the guide opening is connected to the guide port.

[0018] Optionally, the connector also includes a connecting portion and a connecting rod; along the second direction, the connecting portion is provided on the outer side of one end of the first sub-board facing away from the second sub-board, and the connecting portion is provided on the outer side of one end of the second sub-board facing away from the first sub-board; along the second direction, the first plug-in portion is connected to the adjacent connecting portion through a connecting rod, and the second plug-in portion is connected to the adjacent connecting portion through a connecting rod; the connecting portion can drive the connected first plug-in portion to move along the third direction through the connecting rod, so that the first plug-in portion is separated from the first wall; the connecting portion can drive the connected second plug-in portion to move along the third direction through the connecting rod, so that the second plug-in portion is separated from the first wall.

[0019] Optionally, along the second direction, a first through hole connected to the second flow channel is formed at one end of the first sub-plate facing away from the second sub-plate, and a first through hole connected to the second flow channel is formed at one end of the second sub-plate facing away from the first sub-plate; the connecting rod is inserted into the first through hole and can move in the first through hole along the third direction; along the second direction, a shielding portion is provided on one side of the first plug-in portion adjacent to the connected connecting portion, and a shielding portion is provided on one side of the second plug-in portion adjacent to the connected connecting portion; the shielding portion extends along the third direction and shields the first through hole.

[0020] Optionally, the first liquid cooling plate also includes a second elastic member; along the second direction, a crimping portion is provided at one end of the first sub-plate facing away from the second sub-plate, and a crimping portion is provided at one end of the second sub-plate facing away from the first sub-plate; a first slot is opened on a side 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 is provided inside the connecting portion, the connecting portion passes through the first 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 provided 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.

[0021] Optionally, the first liquid cooling plate also includes a second elastic member and a support member; along the second direction, a crimping portion is provided at one end of the first sub-plate facing away from the second sub-plate, and a crimping portion is provided at one end of the second sub-plate facing away from the first sub-plate; a first slot is provided on a side 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, and a second accommodating cavity is provided inside the connecting portion that passes through the connecting portion, the support member passes through the first 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.

[0022] 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 first flow channel plate, the second main body is arranged on the first wall, 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.

[0023] Optionally, the support member also includes a second limiting portion; along the first direction, a second limiting portion is respectively arranged at the opposite ends of the second main body, a guide cavity is defined between the two second limiting portions, and along the third direction, the second limiting portion passes through the first flow channel plate, the crimping portion is inserted in the guide cavity, and the two second limiting portions cooperate to limit the movement of the crimping portion along the third direction.

[0024] Optionally, a plurality of second protrusions are provided on a surface of the first flow channel plate 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 provided on a surface of the first flow channel plate protruding away from the first wall along the third direction, and the first flow channel is defined between two adjacent third protrusions along the second direction; and the first liquid cooling plate abuts against the third protrusions along the third direction.

[0025] Optionally, the first liquid cooling plate also includes a connecting piece, which includes a third body; the third body penetrates the first 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 of the third body 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.

[0026] Optionally, along the third direction, a first protrusion is provided on a side of the first wall facing the first flow channel plate, and a second slot is opened on one end of the first protrusion facing the first 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.

[0027] 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 which passes through 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, and 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.

[0028] 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, at least one third sub-plate and the second sub-plate are connected along the second direction; along the second direction, the first sub-plate and the connected third sub-plate are detachably connected, and the second sub-plate and the connected third sub-plate are detachably connected.

[0029] Optionally, a liquid inlet channel, a liquid outlet channel and a branch channel are further provided on the side of the second channel plate facing the first wall, and the liquid outlet channel and the branch channel extend respectively along the first direction and are spaced apart along the second direction; along the first direction, the liquid outlet end of the liquid inlet channel is connected with the branch channel; along the second direction, an end of the fourth channel away from the liquid inlet is connected with the branch channel, and an end of the fourth channel adjacent to the liquid inlet is connected with the liquid inlet along the third direction; the liquid outlet is connected with the liquid outlet channel along the third direction, and the liquid outlet end of the fifth channel is connected with the liquid outlet channel.

[0030] 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.

[0031] 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 first wall of a box body, a first flow channel is provided on a side of the first flow channel plate away from the first wall, a battery cell, a first liquid cooling plate, and a second liquid cooling plate are provided on the first flow channel plate, the first liquid cooling plate abuts against the battery cell along a first direction, the second liquid cooling plate includes a first single plate abuts against the battery cell along a second direction, a second flow channel is provided inside the first liquid cooling plate, a third flow channel is provided inside the first single plate, a valve body is inserted into the liquid inlet port of the first liquid cooling plate to block the liquid inlet port and the second flow channel in the first liquid cooling plate, and the valve body and the first single plate are arranged along the first direction to block the liquid inlet port and the third flow channel When the pressure on the valve body reaches a preset first pressure threshold, the liquid inlet and the second flow channel can be connected, so that the heat-conducting fluid enters the first liquid cooling plate to adjust and control the temperature of the battery cell. When the pressure on 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, so that the heat-conducting fluid can enter the first single board at the same time as entering the first liquid cooling plate to adjust the temperature of the battery cell, and the first pressure threshold is less than the second pressure threshold, so that when the flow rate of the heat-conducting fluid entering the first liquid cooling plate is too high, the heat-conducting fluid can be diverted through the first single board to reduce the pressure of the heat-conducting fluid, and the temperature uniformity of the battery cell can be improved to ensure the safe use of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0034] Figure 2 yes Figure 1 Exploded diagram of

[0035] Figure 3 This is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application after the box body and the second flow channel plate are removed;

[0036] Figure 4 yes Figure 3 An enlarged schematic diagram of the partial structure at A;

[0037] Figure 5 yes Figure 4 An enlarged schematic diagram from another angle;

[0038] Figure 6 yes Figure 3 A schematic diagram of the structure at B;

[0039] Figure 7 It is a schematic diagram of the combined structure of the first sub-plate and the valve body in the first liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0040] Figure 8 yes Figure 7 CC section view;

[0041] Fig. 9 yes Figure 8 A schematic diagram of the structure at D of FIG.

[0042] Fig.10 is a schematic structural diagram of a first angle of a combination of a first single plate and a valve body in a battery pack provided in an embodiment of the present application;

[0043] Fig.11 is a structural schematic diagram of a second angle of the combination of the first single plate and the valve body in the battery pack provided in an embodiment of the present application;

[0044] Fig.12 yes Fig.11 A schematic diagram of the structure at E of FIG.

[0045] Fig.13 is a schematic diagram of the structure of a valve body in a battery pack provided in an embodiment of the present application;

[0046] Fig.14 yes Fig.13 FF section view;

[0047] Fig.15 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;

[0048] Fig.16 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;

[0049] Fig.17 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;

[0050] Fig.18 is a schematic diagram of the structure of a connector in a battery pack provided in an embodiment of the present application;

[0051] Fig.19 is a schematic diagram of the structure of a support member in a battery pack provided in an embodiment of the present application;

[0052] Fig. 20 is a schematic diagram of the combined structure of the connector and the second elastic member in the battery pack provided in an embodiment of the present application;

[0053] Fig.21 yes Figure 1 GG section view;

[0054] Fig. 22 yes Fig.21 A schematic diagram of the structure at H of FIG.

[0055] Fig.23 yes Fig.21 A schematic diagram of the enlarged structure at position I;

[0056] Fig.24 yes Fig.21 A schematic diagram of the enlarged structure at J;

[0057] Fig.25 yes Figure 1 KK section view;

[0058] Fig.26 yes Fig.25 A schematic diagram of the structure at L is enlarged;

[0059] Fig. 27 yes Fig.25 A schematic diagram of the structure at M of FIG.

[0060] Fig.28 yes Fig.25 A schematic diagram of the enlarged structure at N;

[0061] Fig.29 is a schematic diagram of the structure of a box in a battery pack provided in an embodiment of the present application;

[0062] Fig.30 yes Fig.29 A schematic diagram of the structure at O ​​of FIG.

[0063] Fig.31 is a schematic structural diagram of a first angle of a first flow channel plate in a battery pack provided in an embodiment of the present application;

[0064] Fig.32 is a schematic structural diagram of a second angle of the first flow channel plate in the battery pack provided in an embodiment of the present application;

[0065] Fig.33 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;

[0066] Fig.34 is a second structural schematic diagram of the first liquid cooling plate in the battery pack provided in an embodiment of the present application;

[0067] Fig.35 yes Fig.34 PP section view;

[0068] Fig.36 yes Fig.35 A schematic diagram of the structure at Q of FIG.

[0069] Fig.37 yes Fig.35 The enlarged structural diagram at R of FIG.

[0070] Fig.38 yes Fig.35 A schematic diagram of the structure at S of FIG.

[0071] Fig.39 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;

[0072] Fig.40 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;

[0073] Fig.41 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;

[0074] Fig.42 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;

[0075] Fig.43 is a structural schematic diagram of a first main body in a connector of a first liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0076] Fig.44 is a schematic structural diagram of a clamping member in a connector of a first liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0077] Fig.45 is a schematic structural diagram of the first single plate in the second liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0078] Fig.46 yes Fig.45 TT section view;

[0079] Fig.47 yes Fig.45 UU section view;

[0080] Fig.48 is a partial cross-sectional structural schematic diagram of a second single plate in a second liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0081] Fig.49 is a schematic structural diagram of the third single board in the second liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0082] Fig.50 yes Fig.49 VV sectional view;

[0083] Fig.51 yes Fig.49 WW section view;

[0084] Fig.52 is a schematic structural diagram of a second flow channel plate in a battery pack provided in an embodiment of the present application;

[0085] Fig.53 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0086] Description of main reference numerals:

[0087] 1. Battery pack;

[0088] 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;

[0089] 20. first flow channel plate, 21. first flow channel, 211. first end, 212. second end, 22. second protrusion, 23. third protrusion, 24. first socket, 25. second socket, 26. third socket, 27. fourth socket;

[0090] 30. Battery cell, 31. First side, 32. Second side, 33. Third side, 34. Fourth side, 35. Fifth side, 36. Sixth side, 37. Post;

[0091] 40, first liquid cooling plate, 401, second flow channel, 402, liquid inlet port, 403, liquid outlet port, 404, first through hole, 405, crimping portion, 4051, first slot, 41, plug-in connector, 410, first accommodating cavity, 411, plug-in portion, 4111, first plug-in portion, 4112, second plug-in portion, 4113, flow guide opening, 4114, shielding portion, 4115, sealing ring, 412, connecting portion, 4120, second accommodating cavity, 4121, receiving portion, 4122, through Air hole, 413, connecting rod, 42, sub-plate, 420, sub-flow channel, 421, first sub-plate, 422, second sub-plate, 423, third sub-plate, 43, second elastic member, 44, supporting member, 441, second body, 4410, exhaust hole, 442, card slot, 443, second limiting portion, 4430, guide cavity, 45, connecting member, 451, third body, 4511, second through hole, 4512, clamping portion, 452, clamping member, 4521, third through hole, 4522, spring piece;

[0092] 50, second liquid cooling plate, 51, first single plate, 510, third flow channel, 511, first bending portion, 512, first port, 513, second port, 514, first manifold plate, 52, second single plate, 520, fifth flow channel, 521, second bending portion, 522, third port, 523, fourth port, 524, second manifold plate, 53, third single plate, 530, sixth flow channel, 531, supporting portion, 532, covering portion, 533, fifth port, 534, sixth port, 535, third manifold plate;

[0093] 60. valve body, 61. first main body, 610. flow guide cavity, 611. flow guide port, 612. first limit portion, 62. baffle, 621. first blocking portion, 622. second blocking portion, 623. recessed portion, 63. first elastic member, 64. guide column;

[0094] 70, second flow channel plate, 71, fourth flow channel, 711, protrusion, 72, liquid inlet flow channel, 73, liquid outlet flow channel, 74, branch flow channel;

[0095] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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%.

[0101] The present application embodiment provides an electric device, including a battery pack 1, the battery pack 1 serving 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.

[0102] In some embodiments of the present application, a battery pack 1 is provided, referring to Figure 1 to Figure 51 as well as Fig.53 The battery pack 1 includes: a box body 10, a first flow channel plate 20, a battery cell 30, a first liquid cooling plate 40, a second liquid cooling plate 50 and a valve body 60. 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 53 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0103] Reference Figure 1~Figure 2 , Fig. 22 , Figures 24 to 26 as well as Figures 28 and 29 The box body 10 is provided with a receiving cavity 101, referring to Figure 1~Figure 2 as well as Fig.29 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. 22 and Fig.29 A liquid inlet 111 is provided at one end of the first wall 11 along the second direction Y. Fig.24 and Fig.29 The other end of the first wall 11 along the second direction Y is provided with a liquid outlet 112, and the liquid inlet 111 and the liquid outlet 112 respectively penetrate the first wall 11 along the third direction Z. Figure 1~Figure 2 as well as Fig.29 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 penetrates the first wall 11 along the third direction Z. 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. Figure 1~Figure 2 as well as Fig.29A 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.

[0104] Reference Figure 2~Figure 6 , Figure 22 to Figure 28 as well as Figure 31~Figure 32 The first flow channel plate 20 is arranged on a side of the first wall 11 away from the second wall 12 along the third direction Z. The first flow channel plate 20 is provided with a first flow channel 21 on a side facing the second wall 12 along the third direction Z. The first flow channel 21 extends along the second direction Y.

[0105] Reference Figure 1~Figure 5 , Figure 21 to Figure 28 as well as Fig.53 The battery cell 30 is disposed on the first flow channel plate 20. Specifically, the battery cell 30 is disposed in the first compartment 1011 of the accommodating cavity 101, and the battery cell 30 is disposed on a side of the first flow channel plate 20 away from the first wall 11 along the third direction Z. Fig.53 The battery cell 30 is a square battery. The battery cell 30 includes a first surface 31 and a second surface 32 arranged oppositely along a first direction X, a third surface 33 and a fourth surface 34 arranged oppositely along a second direction Y, and a fifth surface 35 and a sixth surface 36 arranged oppositely along a third direction Z. The first surface 31, the third surface 33, the second surface 32 and the fourth surface 34 are connected end to end in sequence to form a shell structure with two open ends. The fifth surface 35 and the sixth surface 36 cover the two open ends respectively. The first surface 31 and the second surface 32 are the surfaces with the largest surface areas. The battery cell 30 also includes a pole 37, which is arranged on the sixth surface 36.

[0106] Reference Figure 1 to Figure 9 , Figure 21~Figure 24 as well as Figure 33~Figure 44 The first liquid cooling plate 40 is disposed on the first flow channel plate 20 and abuts against the battery cell 30 along the first direction X. The first liquid cooling plate 40 is provided with a second flow channel 401 for the heat transfer fluid to flow. Specifically, refer to Figure 1 to Figure 9 as well as Figure 21~Figure 24 The first liquid cooling plate 40 is disposed in the first compartment 1011 of the accommodating chamber 101 and is disposed on a surface of the first flow channel plate 20 away from the first wall 11 along the third direction Z. Fig. 9 , Fig. 22 , Fig.36 as well as Fig.39A liquid inlet port 402 communicating with the second flow channel 401 is provided on one side of the first liquid cooling plate 40 facing the first wall 11 along the third direction Z, and the liquid inlet port 402 is arranged opposite to the liquid inlet 111 along the third direction Z.

[0107] Reference Figure 1~Figure 5 , Figure 10~Figure 12 , Figure 21-22 , Figure 25-26 as well as Figure 45~Figure 47 The second liquid cooling plate 50 is disposed on the first flow channel plate 20. Specifically, the second liquid cooling plate 50 is disposed on a side of the first flow channel plate 20 away from the first wall 11 along the third direction Z. The second liquid cooling plate 50 includes a first single plate 51 abutting against the battery cell 30 along the second direction Y. Fig.26 as well as Figure 46-47 The first single plate 51 is provided with a third flow channel 510 for the flow of the heat transfer fluid. Fig.26 , the liquid inlet end of the third flow channel 510 faces the liquid inlet 111. Specifically, the liquid inlet end of the third flow channel 510 and the liquid inlet 111 are spaced apart along the first direction X. Along the first direction X, the liquid inlet end of the third flow channel 510 faces the liquid inlet 111. Figure 4~Figure 5 as well as Fig.26 The liquid outlet end of the third flow channel 510 is connected to the first flow channel 21. Specifically, the liquid outlet end of the third flow channel 510 is connected to the first flow channel 21 along the second direction Y.

[0108] Reference Figure 4~Figure 5 , Figure 7 to Figure 17 as well as Fig. 22 The valve body 60 is inserted into the liquid inlet port 402 of the first liquid cooling plate 40 to block the liquid inlet port 111 and the second flow channel 401. Figure 4~Figure 5 as well as Figure 10~Figure 12 The valve body 60 and the first single plate 51 are arranged along the first direction X to block the liquid inlet 111 and the liquid inlet end of the third flow channel 510. When the pressure on the valve body 60 reaches a preset first pressure threshold, the liquid inlet 111 and the second flow channel 401 can be connected. When the pressure on the valve body 60 reaches a preset second pressure threshold, the liquid inlet 111 and the liquid inlet end of the third flow channel 510 can be connected. The first pressure threshold is less than the second pressure threshold.

[0109] In the battery pack, heat-conducting fluid is introduced into the liquid cooling plate to regulate and control the temperature of the battery cells. When an abnormal situation occurs in the battery pack and the temperature of the battery cells is too high, it is necessary to increase the amount of heat-conducting fluid introduced to reduce the temperature of the battery cells as quickly as possible. However, when a large amount of heat-conducting fluid is introduced in a short period of time, the fluid pressure of the heat-conducting fluid on the liquid cooling plate is relatively large, which can easily cause damage to the liquid cooling plate, thereby affecting the service life of the liquid cooling plate and making it difficult for the temperature of the battery cells to return to normal in a short period of time, thereby affecting the service life of the battery pack.

[0110] The battery pack 1 provided in the embodiment of the present application is provided with a first flow channel plate 20 on a side of the first wall 11 of the box body 10 facing the second wall 12, and a first flow channel 21 for the flow of a heat-conducting fluid is provided on a side of the first flow channel plate 20 away from the first wall 11 in the third direction Z, and the battery cell 30, the first liquid cooling plate 40 and the second liquid cooling plate 50 are all provided on a side of the first flow channel plate 20 away from the first wall 11 along the third direction Z, the first liquid cooling plate 40 abuts against the battery cell 30 along the first direction X, a second flow channel 401 for the flow of a heat-conducting fluid is provided inside the first liquid cooling plate 40, and a liquid inlet port 402 connected to the second flow channel 401 is provided on a side of the first liquid cooling plate 40 facing the first wall 11 in the third direction Z, and the liquid inlet port 402 is arranged opposite to the liquid inlet port 111 along the third direction Z, and the second The liquid cooling plate 50 includes a first single plate 51 abutting against the battery cell 30 along the second direction Y, and a third flow channel 510 for the flow of heat transfer fluid is provided inside the first single plate 51. The liquid inlet end of the third flow channel 510 faces the liquid inlet 111 along the first direction X, and the liquid outlet end is communicated with the first flow channel 21. A valve body 60 is inserted into the liquid inlet port 402 of the first liquid cooling plate 40. The valve body 60 forms a barrier between the liquid inlet 111 and the second flow channel 401 in the first liquid cooling plate 40 to prevent the heat transfer fluid from entering the second flow channel 401 through the liquid inlet 111 and the liquid inlet port 402. Moreover, the valve body 60 and the first single plate 51 are arranged along the first direction X to block the liquid inlet 111 and the liquid inlet end of the third flow channel 510 to prevent the heat transfer fluid from entering the third flow channel 510 through the liquid inlet 111 and the liquid inlet end of the third flow channel 510. When the pressure on the valve body 60 reaches a preset first pressure threshold, the liquid inlet 111 and the second flow channel 401 can be connected. When the pressure on the valve body 60 reaches a preset second pressure threshold, the liquid inlet 111 and the liquid inlet end of the third flow channel 510 can be connected. The first pressure threshold is less than the second pressure threshold.

[0111] Specifically, the valve body 60 has a preset first pressure threshold and a second pressure threshold. The valve body 60 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 60 to open. Specifically, when the valve body 60 is in an unopened state (that is, when the pressure does not reach the first pressure threshold), the valve body 60 forms a barrier between the liquid inlet 111 and the liquid inlet port 402, and at the same time forms a barrier between the liquid inlet 111 and the liquid inlet end of the third flow channel 510, so that the heat-conducting fluid cannot enter the liquid inlet port 402 through the liquid inlet 111, nor can it enter the third flow channel 510.

[0112] When the temperature of the battery cell 30 in the battery pack 1 deviates from the normal working temperature by ±15°C, the battery pack 1 is in a normal working state. At this time, the pressure of the heat-conducting fluid introduced through the liquid inlet pipe 15 is relatively small. The heat-conducting fluid enters the valve body 60 through the liquid inlet 111 and exerts pressure on the valve body 60. When the fluid pressure of the heat-conducting fluid on the valve body 60 reaches the first pressure threshold, the valve body 60 is partially opened to connect the liquid inlet 111 with the liquid inlet port 402, so that the heat-conducting fluid enters the second flow channel 401 of the first liquid cooling plate 40, thereby regulating and controlling the temperature of the battery cell 30. Since the fluid pressure on the valve body 60 does not reach the second pressure threshold, the valve body 60 still forms a barrier between the liquid inlet 111 and the liquid inlet end of the third flow channel 510, and the heat-conducting fluid cannot enter the third flow channel 510 of the first single plate 51. The temperature of the battery cell 30 can be regulated only through the first liquid cooling plate 40, thereby improving the utilization rate of the heat-conducting fluid and reducing energy consumption.

[0113] When the temperature of the battery cell 30 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 transfer fluid introduced through the liquid inlet pipe 15. The heat transfer fluid enters the valve body 60 through the liquid inlet port 111 and applies pressure to the valve body 60. Due to the high pressure of the heat transfer fluid, the fluid pressure on the valve body 60 reaches a preset second pressure threshold, so that the valve body 60 connects the liquid inlet port 111 with the liquid inlet port 402, and also connects the liquid inlet port 111 with the liquid inlet end of the third flow channel 510, so that a Part of the heat-conducting fluid enters the second flow channel 401 through the liquid inlet port 402, and another part of the heat-conducting fluid enters the third flow channel 510 through the liquid inlet end of the third flow channel 510, thereby regulating the temperature of the battery cell 30 abutting against the first single plate 51, and regulating the temperature near the pole 37 of the battery cell 30. The heat-conducting fluid entering the third flow channel 510 is discharged to the first flow channel 21 through the liquid outlet end of the third flow channel 510. The heat-conducting fluid entering the first flow channel 21 can directly contact the fifth surface 35 of the battery cell 30 to regulate the temperature of the battery cell 30. When the fluid pressure on the valve body 60 reaches the second pressure threshold, the first single plate 51 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 40 and improve the service life of the first liquid cooling plate 40, but also the first single plate 51 can cooperate with the first liquid cooling plate 40 and the first flow channel plate 20 to form temperature regulation of multiple surfaces of the battery cell 30, thereby improving the temperature regulation efficiency and allowing the operating temperature of the battery cell 30 to return to a reasonable operating temperature range as soon as possible, thereby ensuring the safety of the use of the battery cell 30 and the safety of the battery pack 1 and improving the service life of the battery cell 30 and the battery pack 1.

[0114] In some embodiments, reference Figure 9~Figure 17The valve body 60 includes a first body 61 and a baffle 62, referring to Fig. 9 The first body 61 is inserted into the liquid inlet port 402 of the first liquid cooling plate 40, referring to Fig. 9 and Fig.15 The first body 61 is provided with a guide cavity 610 that penetrates the first body 61 along the third direction Z. Figure 11~Figure 12 as well as Figure 15-16 The first body 61 is provided with a guide port 611 connected to the guide cavity 610 along the first direction X toward the first single plate 51. Figure 9~Figure 17 The baffle 62 is arranged in the guide cavity 610, and the baffle 62 includes a first blocking portion 621 and a second blocking portion 622 connected along the third direction Z. The first blocking portion 621 can block the guide cavity 610. Specifically, the first blocking portion 621 is arranged at one end of the guide cavity 610 away from the first wall 11 along the third direction Z. The first blocking portion 621 is connected to the first main body 61 to block the guide cavity 610, so that the valve body 60 can block the liquid inlet 111 and the second flow channel 401 in the closed state, and the second blocking portion 622 can block the guide port 611. The baffle 62 can reciprocate along the third direction Z in the guide cavity 610.

[0115] Reference Fig.15 When the pressure on the first blocking portion 621 reaches the first pressure threshold, the liquid inlet 111 and the second flow channel 401 can be connected. Fig. 9 , Figure 15-16 and Fig. 22 The heat-conducting fluid enters the flow-guiding cavity 610 through the liquid inlet 111 and the liquid inlet port 402 and pushes the first blocking portion 621 along the third direction Z. The first blocking portion 621 is pushed away from the first wall 11 by the heat-conducting fluid and is separated from the first body 61, thereby connecting the flow-guiding cavity 610 and the second flow channel 401 of the first liquid cooling plate 40, so that the heat-conducting fluid enters the second flow channel 401 through the flow-guiding cavity 610 to regulate the temperature of the battery cell 30. Figure 10~Figure 12 as well as Fig.15 Since the pressure of the heat transfer fluid entering the flow guide cavity 610 is relatively small, the fluid pressure applied to the first blocking portion 621 only reaches the first pressure threshold. Although the first blocking portion 621 can drive the second blocking portion 622 to move together during the movement, the fluid pressure on the first blocking portion 621 is relatively small, resulting in the second blocking portion 622 still being able to form a blockage on the flow guide port 611, and the heat transfer fluid entering the flow guide cavity 610 cannot enter the third flow channel 510 through the flow guide port 611 and the first port 512.

[0116] Reference Fig.16When the pressure on the first blocking portion 621 reaches the second pressure threshold, the liquid inlet 111 and the second flow channel 401 can be connected, and the second blocking portion 622 can be driven to expose at least part of the guide port 611 to connect the liquid inlet 111 and the liquid inlet end of the third flow channel 510, referring to Fig. 22 The heat-conducting fluid enters the flow-guiding cavity 610 through the liquid inlet 111 and pushes the first blocking portion 621 along the third direction Z. The first blocking portion 621 is pushed by the heat-conducting fluid to move away from the first wall 11 and separate from the first body 61, thereby connecting the flow-guiding cavity 610 and the second flow channel 401 of the first liquid cooling plate 40, so that the heat-conducting fluid enters the second flow channel 401 through the flow-guiding cavity 610 to regulate the temperature of the battery cell 30. At the same time, due to the heat-conducting fluid entering the flow-guiding cavity 610, the temperature of the battery cell 30 is controlled. The pressure of the fluid is relatively large, and the fluid pressure applied to the first blocking portion 621 reaches the second pressure threshold, so that the heat-conducting fluid can apply sufficient thrust to the first blocking portion 621, so that the first blocking portion 621 drives the second blocking portion 622 to move away from the first wall 11 along the third direction Z and the second blocking portion 622 can expose at least part of the guide port 611 to connect the guide port 611 with the liquid inlet end of the third flow channel 510, so that part of the heat-conducting fluid entering the guide cavity 610 passes through the first wall 11. The heat transfer fluid enters the second flow channel 401 through the gap between the first blocking portion 621 and the first main body 61, and the other part enters the third flow channel 510 through the guide port 611 and the liquid inlet end of the third flow channel 510. The heat transfer fluid entering the third flow channel 510 enters the first flow channel 21 through the liquid outlet end of the third flow channel 510. The heat transfer fluid entering the first flow channel 21 can form a temperature control for the fifth surface 35 of the battery cell 30, thereby forming a diversion of the heat transfer fluid with a larger pressure, preventing the heat transfer fluid from damaging the first liquid cooling plate 40, and improving the service life of the first liquid cooling plate 40. In addition, the first single plate 51 can cooperate with the first liquid cooling plate 40 and the first flow channel plate 20 to control the temperatures of multiple surfaces of the battery cell 30, thereby improving the temperature control efficiency, so that the operating temperature of the battery cell 30 returns to a reasonable operating temperature range as soon as possible, ensuring the safety of the battery cell 30 and the battery pack 1, and improving the service life of the battery cell 30 and the battery pack 1.

[0117] Moreover, the structural design of the baffle 62 reciprocating along the third direction Z in the guide cavity 610 enables the first blocking portion 621 to fall back along the third direction Z and approach the first wall 11 when the fluid pressure applied by the heat-conducting fluid to the first blocking portion 621 is lower than the second pressure threshold but higher than the first pressure threshold, and drives the second blocking portion 622 to reduce the opening of the guide port 611 and adjust the flow rate of the heat-conducting fluid entering the third flow channel 510. When the fluid pressure applied to the first blocking portion 621 is equal to the first pressure threshold, it indicates that the electric The operating temperature of the battery cell 30 only exceeds the normal operating temperature by ±15°C. The first sealing part 621 drives the second sealing part 622 to move to the sealed flow guide port 611, so that the heat transfer fluid can only enter the second flow channel 401. When the fluid pressure on the first sealing part 621 is less than the first pressure threshold, it indicates that the battery cell 30 is in the normal operating temperature range. The first sealing part 621 forms a blockage for the flow guide cavity 610, and there is no need to control the temperature of the battery cell 30 by the heat transfer fluid, thereby reducing energy consumption and improving temperature control efficiency.

[0118] In some embodiments, reference Figure 14~Figure 16 The valve body 60 further includes a first elastic member 63. Along the third direction Z, the end of the first blocking portion 621 away from the first flow channel plate 20 is recessed to form a recessed portion 623. Figure 10~Figure 17 The first main body 61 has a first limiting portion 612 connected to one end thereof away from the first flow channel plate 20. The first blocking portion 621 moves along the third direction Z. The first limiting portion 612 is embedded in the recessed portion 623. Specifically, refer to Figure 15-16 The first blocking portion 621 moves along the third direction Z in a direction away from the first wall 11, and the first limiting portion 612 is embedded in the recessed portion 623. When the valve body 60 is not opened, the first limiting portion 612 blocks the open end of the recessed portion 623. Fig.14 The first elastic member 63 is arranged in the recessed portion 623, one end of the first elastic member 63 along the third direction Z abuts against the first limiting portion 612, and the other end abuts against the recessed portion 623, the first blocking portion 621 moves away from the first flow channel plate 20 along the third direction Z, and the recessed portion 623 squeezes the first elastic member 63, when the fluid pressure applied to the first blocking portion 621 is lower than the first pressure threshold, the thrust force of the heat-conducting fluid applied to the first blocking portion 621 is smaller than the rebound force applied by the first elastic member 63 to the recessed portion 623, and the first blocking portion 621 moves toward the direction close to the first flow channel plate 20 under the action of the first elastic member 63, until the first blocking portion 621 blocks the guide cavity 610, thereby realizing the reciprocating movement of the baffle 62 in the guide cavity 610.

[0119] In some embodiments, reference Figure 10~Figure 17The valve body 60 also includes a guide column 64, one end of the guide column 64 along the third direction Z is connected to the recessed portion 623, and the other end is inserted into the first limiting portion 612. The first elastic member 63 is sleeved on the guide column 64. The guide column 64 can form support and guidance for the first elastic member 63, so that the first blocking portion 621 can reciprocate along the third direction Z to ensure the sealing of the first blocking portion 621 to the guide cavity 610.

[0120] In some embodiments, along the first direction X, the first liquid cooling plate 40 abuts against the first surface 31 or the second surface 32 of the adjacent battery cell 30 , thereby forming a large-surface liquid cooling of the battery cell 30 by the first liquid cooling plate 40 , thereby improving the temperature control efficiency of the battery cell 30 by the first liquid cooling plate 40 .

[0121] In some embodiments, reference Figure 2 , Figure 21 to Figure 28 as well as Fig.52 The battery pack 1 further includes a second flow channel plate 70, which is disposed on a side of the first wall 11 away from the second wall 12 along the third direction Z, and a fourth flow channel 71 is disposed on a side of the second flow channel plate 70 facing the first wall 11, referring to Fig.24 as well as Fig.29 The first wall 11 has a liquid outlet 112 at one end thereof away from the liquid inlet 111 along the second direction Y. The liquid outlet 112 penetrates the first wall 11 along the third direction Z. Fig. 22 The liquid inlet 111 is connected to the fourth flow channel 71 along the third direction Z, referring to Fig.24 , Fig.38 as well as Fig.40The first liquid cooling plate 40 is provided with a liquid outlet port 403 connected to the second flow channel 401 on one side facing the first wall 11 along the third direction Z, and the liquid outlet port 403 is arranged opposite to the liquid outlet port 112 along the third direction Z. The arrangement of the second flow channel plate 70 can form a centralized liquid supply to multiple first liquid cooling plates 40 and the first single board 51 through the fourth flow channel 71, that is, the heat transfer fluid in the liquid inlet pipe 15 passes through the fourth flow channel 71 and the liquid inlet port 111 into the second flow channel 401 and the third flow channel 510. Specifically, a part of the heat transfer fluid in the fourth flow channel 71 enters the second flow channel 401 of the first liquid cooling plate 40 through the liquid inlet port 111 and the liquid inlet port 402, thereby forming a temperature control of the first surface 31 or the second surface 32 of the battery cell 30. A part of the heat transfer fluid passes through the liquid inlet port 111 and the third flow channel 510. The liquid inlet end enters the third flow channel 510, thereby forming a temperature control for the third side 33 or the fourth side 34 of the battery cell 30 abutting against the first single plate 51. The heat-conducting fluid entering the third flow channel 510 can enter the first flow channel 21 through the liquid outlet end and directly contact the fifth side 35 of the battery cell 30, thereby forming a temperature control for the fifth side 35 of the battery cell 30, thereby forming a temperature control for multiple sides of the battery cell 30, improving the temperature uniformity of the battery cell 30, and avoiding the situation where a pipeline is set in the accommodating cavity 101 to supply liquid to the liquid cooling plate, thereby improving the volume utilization rate in the accommodating cavity 101.

[0122] In some embodiments, reference Fig.52 The second channel plate 70 is further provided with a liquid inlet channel 72, a liquid outlet channel 73 and a branch channel 74 on one side thereof facing the first wall 11 along the third direction Z. The liquid outlet channel 73 and the branch channel 74 extend along the first direction X and are arranged at intervals along the second direction Y. The liquid inlet end of the liquid inlet channel 72 is connected to the liquid inlet pipe 15. Along the first direction X, the liquid outlet end of the liquid inlet channel 72 is connected to the branch channel 74. Along the second direction Y, an end of the fourth channel 71 away from the liquid inlet port 111 is connected to the branch channel 74. An end of the fourth channel 71 adjacent to the liquid inlet port 111 is connected to the liquid inlet port 111 along the third direction Z. A protrusion 711 extending along the second direction Y is provided inside the fourth channel 71. Fig.24 , the liquid outlet 112 is connected to the liquid outlet channel 73 along the third direction Z, and the liquid outlet end of the fifth channel 520 is connected to the liquid outlet channel 73, that is, referring to Figure 6, the fourth port 523 of the second single plate 52 faces the liquid outlet 112 along the first direction X and is connected to the liquid outlet 112. The heat-conducting fluid in the liquid inlet pipe 15 enters the branch channel 74 through the liquid inlet channel 72. Since the plurality of fourth channels 71 are respectively connected to the branch channels 74 along the second direction Y, the heat-conducting fluid entering the branch channels 74 can respectively enter the fourth channels 71. The setting of the protrusion 711 in the fourth channel 71 can form a uniform flow of the heat-conducting fluid entering the fourth channel 71. When the fluid pressure of the heat-conducting fluid entering the fourth channel 71 reaches the first pressure threshold, it can enter the second channel 401 of the first liquid cold plate 40 through the liquid inlet 111 and the valve body 60, and reach the second pressure threshold. The heat transfer fluid enters the third flow channel 510 of the first single plate 51 through the liquid inlet 111 and the valve body 60, enters the second flow channel 401 through the liquid outlet port 403 and the liquid outlet 112 and enters the liquid outlet flow channel 73, and the heat transfer fluid enters the third flow channel 510 and passes through the sixth flow channel 530 and the fifth flow channel 520 in sequence, and enters the liquid outlet flow channel 73 through the liquid outlet 112 via the fourth port 523 of the second single plate 52, and the heat transfer fluid entering the liquid outlet flow channel 73 is discharged to the outside of the box body 10 through the liquid outlet pipe 16, thereby forming a circulation of the heat transfer fluid.

[0123] Among them, the liquid inlet channel 72 extends along the second direction Y on the second channel plate 70, and the heat-conducting fluid is provided to the liquid inlet channel 72 through the liquid inlet pipe 15. The heat-conducting fluid enters the liquid inlet channel 72. The liquid inlet channel 72 is structurally arranged to extend along the second direction Y, so that a part of the heat-conducting fluid entering the liquid inlet channel 72 can flow in the liquid inlet channel 72, thereby forming temperature control of the components arranged in the second compartment 1012, such as the BMS (battery management system) module and the BDU (battery disconnection unit) module.

[0124] Optionally, a side of the second channel plate facing the first wall is further provided with a liquid inlet channel, a liquid outlet channel and a branch channel, the liquid outlet channel and the branch channel respectively extend along the first direction and are spaced apart along the second direction; along the first direction, the liquid outlet end of the liquid inlet channel is connected with the branch channel; along the second direction, an end of the fourth channel away from the liquid inlet is connected with the branch channel, and an end of the fourth channel adjacent to the liquid inlet is connected with the liquid inlet along the third direction; a protrusion extending along the second direction is provided inside the fourth channel; along the third direction, the liquid outlet is connected with the liquid outlet channel, and the liquid outlet end of the sixth channel is connected with the liquid outlet channel.

[0125] In some embodiments, reference Figure 22~Figure 24 as well as Figure 26~Figure 30A first protrusion 113 is provided on one side of the first wall 11 facing the first flow channel plate 20 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.32 The first flow channel plate 20 has a plurality of second protrusions 22 protruding from one side of the first wall 11 along the third direction Z, and the first protrusion 113 is embedded between two adjacent second protrusions 22 along the second direction Y, thereby improving the installation stability and firmness of the first flow channel plate 20 on the first wall 11. Fig.31 A plurality of third protrusions 23 are protruding from a side of the first flow channel plate 20 away from the first wall 11 along the third direction Z, and a first flow channel 21 is defined between two adjacent third protrusions 23 along the second direction Y. The first liquid cooling plate 40 abuts against the third protrusions 23 along the third direction Z.

[0126] In some implementations, the second protrusion 22 can be directly formed on the first flow channel plate 20 during the processing and forming process. The depression formed by the second protrusion 22 on the first flow channel plate 20 is the first flow channel 21, and a third protrusion 23 is formed between two adjacent second protrusions 22 along the first direction X.

[0127] In some embodiments, reference Figure 4~Figure 5 , Figure 10~Figure 12 , Fig. 22 , Fig.26 as well as Figure 45~Figure 47 , the opposite ends of the first single plate 51 along the third direction Z are bent to form first bent portions 511, specifically, the opposite ends of the first single plate 51 along the third direction Z are bent to the same side to form the first bent portions 511, the liquid inlet end and the liquid outlet end of the third flow channel 510 are respectively provided on the first bent portion 511 adjacent to the first flow channel plate 20 along the third direction Z, and the first bent portion 511 away from the first flow channel plate 20 along the third direction Z overlaps with the sixth surface 36 of the battery cell 30 provided with the pole 37, specifically, the first bent portion 511 adjacent to the first flow channel plate 20 along the third direction Z is provided with a first port 512 and a second port 513 respectively connected to the third flow channel 510, the first port 512 is toward the liquid inlet 111 along the first direction X, and the second port 513 is toward the first flow channel 21 along the second direction Y, refer to Fig.46 and Fig.47A first diverter plate 514 extending along the third direction Z is provided inside the first single plate 51. The first diverter plate 514 divides the third flow channel 510 into a first liquid inlet flow channel connected to the first port 512 and a first liquid outlet flow channel connected to the second port 513. The first liquid inlet flow channel and the first liquid outlet flow channel are connected at a first bending portion 511 away from the first flow channel plate 20. Part of the heat transfer fluid in the fourth flow channel 71 enters the first liquid inlet flow channel through the liquid inlet port 111 via the first port 512, and enters the first liquid outlet flow channel through the first bending portion 511 away from the first flow channel plate 20, enters the first flow channel 21 via the second port 513 and directly contacts the fifth surface 35 of the battery cell 30 to adjust the temperature of the fifth surface 35. Moreover, along the third direction Z, the first bending portion 511 adjacent to the first flow channel plate 20 forms a support for the fifth side 35 of the battery cell 30, and the first bending portion 511 away from the first flow channel plate 20 forms a cover for the sixth side 36 of the battery cell 30, thereby wrapping and fixing the battery cell 30, and the temperature of the sixth side 36 of the pole 37 of the battery cell 30 can be regulated, so that the pole 37 is in a suitable operating temperature range, thereby improving the service life of the battery cell 30.

[0128] In some embodiments, reference Fig.31 The first flow channel 21 includes a first end 211 and a second end 212 that are relatively arranged along the second direction Y. The first end 211 and the second end 212 are respectively provided with a second socket 25 that penetrates the first flow channel plate 20 along the third direction Z. The first end 211 and the second end 212 are also respectively provided with a third socket 26 that penetrates the first flow channel plate 20 along the third direction Z. The first single plate 51 is embedded in the first flow channel 21. The first bending portion 511 adjacent to the first flow channel plate 20 along the third direction Z is inserted into the second socket 25 located at the first end 211. The first port 512 is connected to the third socket 26 located at the first end 211 along the first direction X.

[0129] In some embodiments, reference Figure 1 , Figure 3 , Figure 6 , Fig.21 , Figure 24-25 , Fig.28 as well as Fig.48 The second liquid cooling plate 50 further includes a second single plate 52. Along the second direction Y, the second single plate 52 is arranged opposite to the first single plate 51 and respectively abuts against the battery cells 30. Specifically, along the second direction Y, the first single plate 51 abuts against the third surface 33 of the adjacent battery cell 30, and the second single plate 52 abuts against the fourth surface 34 of the adjacent battery cell 30. Fig.28 and Fig.48A fifth flow channel 520 for the flow of heat-conducting fluid is provided inside the second single plate 52. The liquid inlet end of the fifth flow channel 520 is connected to the first flow channel 21, and the liquid outlet end is connected to the liquid outlet 112. The opposite ends of the second single plate 52 are bent to form second bending portions 521. The liquid inlet end and the liquid outlet end of the fifth flow channel 520 are respectively opened on the second bending portions 521 adjacent to the first flow channel plate 20. Along the third direction Z, one second bending portion 521 abuts against the fifth surface 35 of the battery cell 30, and the other second bending portion 521 abuts against the sixth surface 36 of the battery cell 30.

[0130] Specifically, refer to Figure 6 , Fig.28 as well as Fig.48 The opposite ends of the second single plate 52 along the third direction Z are bent toward the same side to form a second bent portion 521. A third port 522 and a fourth port 523 respectively connected to the fifth flow channel 520 are provided on the second bent portion 521 adjacent to the first flow channel plate 20 along the third direction Z. The third port 522 is the liquid inlet end of the fifth flow channel 520, and the fourth port 523 is the liquid outlet end of the fifth flow channel 520. The third port 522 is toward the first flow channel 21 along the second direction Y and is connected to the first flow channel 21. The fourth port 523 is toward the liquid outlet 112 along the first direction X. Fig.48 A second shunt plate 524 extending along the third direction Z is provided inside the second single plate 52. The second shunt plate 524 divides the fifth flow channel 520 into a second liquid inlet flow channel connected to the third port 522 and a second liquid outlet flow channel connected to the fourth port 523. The second liquid inlet flow channel is connected to the second liquid outlet flow channel at the second bending portion 521 away from the first flow channel plate 20. The heat transfer fluid in the first flow channel 21 enters the second liquid inlet flow channel through the third port 522, enters the second liquid outlet flow channel through the second bending portion 521 away from the first flow channel plate 20, and enters the liquid outlet flow channel 73 through the fourth port 523 and the liquid outlet 112, so that the temperature of the battery cell 30 abutting against the second single plate 52 is regulated by the second single plate 52. Moreover, along the third direction Z, the second bend portion 521 adjacent to the first flow channel plate 20 forms a support for the fifth side 35 of the battery cell 30, and the second bend portion 521 away from the first flow channel plate 20 forms a cover for the sixth side 36 of the battery cell 30, thereby wrapping and fixing the battery cell 30, and the temperature of the sixth side 36 of the pole 37 of the battery cell 30 can be regulated, so that the pole 37 is in a suitable operating temperature range, thereby improving the service life of the battery cell 30.

[0131] In some embodiments, reference Figure 6 as well as Fig.28 The second single plate 52 is embedded in the first flow channel 21, referring to Fig.31 and Fig.32The second bending portion 521 adjacent to the first flow channel plate 20 along the third direction Z is inserted into the second socket 25 located at the second end 212 , and the fourth port 523 is connected to the third socket 26 located at the second end 212 along the first direction X.

[0132] In some embodiments, reference Figure 1 to Figure 6 , Fig.21 , Fig.23 , Fig.25 , Fig. 27 as well as Figure 49~Figure 51 The second liquid cooling plate 50 also includes a third single plate 53, referring to Figure 4~Figure 6 as well as Fig. 27 The third single plate 53 is embedded in the first flow channel 21, referring to Figure 1 to Figure 6 , Fig.21 as well as Fig.25 Along the second direction Y, a plurality of battery cells 30 are arranged between the first single board 51 and the second single board 52, and a third single board 53 is arranged between two adjacent battery cells 30. Fig. 27 as well as Figure 50~Figure 51 A sixth flow channel 530 for the flow of heat transfer fluid is provided inside the third single plate 53, and the liquid inlet and outlet of the sixth flow channel 530 are respectively connected to the first flow channel 21. Figure 4~Figure 6 , Fig. 27 as well as Figure 49~Figure 51 Along the third direction Z, a supporting portion 531 is provided at one end of the third single plate 53, and a covering portion 532 is provided at the other end. The liquid inlet end and the liquid outlet end of the sixth flow channel 530 are respectively opened on the supporting portion 531, the supporting portion 531 abuts against the fifth surface 35 of the adjacent battery cell 30, and the covering portion 532 abuts against the sixth surface 36 of the adjacent battery cell 30.

[0133] Specifically, refer to Figure 4~Figure 5 as well as Fig.49 The support portion 531 is provided with a fifth port 533 and a sixth port 534 respectively connected to the sixth flow channel 530. Along the second direction Y, the fifth port 533 as the liquid inlet end of the sixth flow channel 530 faces the first single plate 51, and the sixth port 534 as the liquid outlet end of the sixth flow channel 530 faces the second single plate 52. The fifth port 533 and the sixth port 534 are respectively connected to the first flow channel 21. Figure 50~Figure 51A third manifold 535 extending along the third direction Z is provided inside the third single plate 53. The third manifold 535 divides the sixth flow channel 530 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 532. The heat transfer fluid entering the third flow channel 510 enters the first flow channel 21 through the second port 513, and the heat transfer fluid entering the first flow channel 21 enters the third liquid inlet flow channel in the sixth flow channel 530 through the fifth port 533, and enters the third liquid outlet flow channel at the covering portion 532, and then flows out through the sixth port 534, thereby forming a temperature control of the adjacent side surfaces of two adjacent battery cells 30 along the second direction Y. The covering portion 532 can form a temperature control of the sixth surface 36 of the battery cell 30, thereby adjusting the temperature near the pole 37 arranged on the sixth surface 36. Moreover, along the third direction Z, the support portion 531 forms a support for the fifth side 35 of the battery cell 30, and the covering portion 532 forms a covering for the sixth side 36 of the battery cell 30, thereby wrapping and fixing the battery cell 30, and the temperature of the sixth side 36 of the pole 37 of the battery cell 30 can be regulated, so that the pole 37 is in a suitable operating temperature range, thereby improving the service life of the battery cell 30.

[0134] The first single plate 51, the third single plate 53 and the second single plate 52 are arranged at intervals along the second direction Y, which can clamp and fix the battery cell 30 along the second direction Y. While adjusting and controlling the temperature of the third surface 33 and the fourth surface 34 of the battery cell 30, the assembly stability of the battery cell 30 in the second direction Y can be guaranteed.

[0135] In some embodiments, reference Fig. 9 and Fig.10 The second single plate 52 is embedded in the first flow channel 21, and the second bending portion 521 adjacent to the first flow channel plate 20 along the third direction Z is inserted into the second socket 25 located at the second end 212, and the fourth port 523 is connected to the third socket 26 located at the second end 212 along the first direction X.

[0136] In some embodiments, reference Figure 8~Figure 9 , Figure 17-18 , Fig. 20 , Fig. 22 , Fig.24 , Figure 33~Figure 36 as well as Figure 38~Figure 41 The first liquid cooling plate 40 includes a connector 41 and a plurality of sub-plates 42 connected along the second direction Y, referring to Figure 7~Figure 9 , Figure 21~Figure 24 as well as Figure 33~Figure 40 The plurality of sub-boards 42 at least include a first sub-board 421 and a second sub-board 422. Figure 21~Figure 24 as well as Fig.33In the embodiment shown, the first liquid cooling plate 40 includes a connector 41, a first sub-plate 421 and a second sub-plate 422. Fig. 22 The first sub-board 421 is inserted into the liquid inlet 111 through the plug-in component 41, referring to Fig.24 The second sub-plate 422 is inserted into the liquid outlet 112 through the connector 41 to connect the fourth channel 71 on the second channel plate 70 with the second channel 401 in the first liquid cooling plate 40. The connector 41 is detachably connected to the first wall 11, and the two sub-plates 42 connected along the second direction Y are detachably connected. The connector 41 is detachably connected to the first wall 11, so that when the first liquid cooling plate 40 is damaged (for example, damage caused by excessive pressure of the heat-conducting fluid entering the first liquid cooling plate 40) or the first liquid cooling plate 40 needs to be disassembled for recycling of the battery pack 1, the connector 41 can be detachably connected to the first wall 11, and the connector 41 can be moved along the third direction Z until the connector 41 is separated from the first wall 11, so that the first sub-board 421 or the second sub-board 422 connected to the connector 41 is separated from the first wall 11, and the two sub-boards 42 adjacent to each other along the second direction Y are detachably connected. Specifically, the first sub-board 421 is connected to the second sub-board 422 along the second direction Y, and the first sub-board 421 and the second sub-board 422 are detachably connected. The first sub-board 421 and / or the second sub-board 422 separated from the first wall 11 can be connected so that the first sub-board 421 and / or the second sub-board 422 can be moved along the second direction Y to be separated from the connected sub-board 42, thereby removing the first sub-board 421 and / or the second sub-board 422 from the box body 10, and losing the restraint of the first sub-board 421 and / or the second sub-board 422 in the third direction Z, and the remaining sub-board 42 in the first liquid cooling plate 40 that is not connected to the plug-in connector 41 can be moved along the second direction Y and separated from the connected sub-board 42, and then removed from the box body 10, so that the first liquid cooling plate 40 can be repaired or used in other battery packs, thereby reducing the manufacturing cost of the battery pack 1. Moreover, the first liquid cooling plate 40 includes a first sub-plate 421 and a second sub-plate 422 connected along the second direction Y, so that the first liquid cooling plate 40 can form a spliced ​​structure, forming a modular structural design of the first liquid cooling plate 40. The independent processing of multiple sub-plates 42 can also improve the manufacturing efficiency of the first liquid cooling plate 40 and reduce the manufacturing cost.

[0137] In some embodiments, reference Figure 8~Figure 9 , Figure 21~Figure 24 , Figure 35~Figure 38 as well as Figure 40~Figure 41 A sub-channel 420 for the flow of the guide fluid is provided inside the sub-plate 42, and multiple sub-plates 42 are connected along the second direction Y. The sub-channels 420 in the multiple sub-plates 42 are connected along the second direction Y to form a second channel 401, thereby ensuring the smooth flow of the heat transfer fluid in the second channel 401.

[0138] In some embodiments, reference Figure 7~Figure 9 , Figure 17-18 , Fig. 22 , Fig.24 , Figure 33~Figure 36 as well as Fig.38 , the plug connector 41 includes a plug connector portion 411, referring to Fig.24 , Figure 35-36 as well as Fig.38 The plug-in portion 411 is provided with a first accommodating cavity 410 that penetrates the plug-in portion 411 along the third direction Z. Figure 7~Figure 9 , Fig. 22 , Fig.24 , Figure 33~Figure 36 as well as Fig.38 The plug-in portion 411 includes a first plug-in portion 4111 and a second plug-in portion 4112. Specifically, the first plug-in portion 4111 is provided with a first accommodating cavity 410 that penetrates the first plug-in portion 4111 along the third direction Z, and the second plug-in portion 4112 is provided with a first accommodating cavity 410 that penetrates the second plug-in portion 4112 along the third direction Z. Fig. 9 , Fig. 22 , Fig.36 as well as Fig.39 The first sub-plate 421 is provided with a liquid inlet port 402 on one side thereof facing the first wall 11 along the third direction Z. One end of the first plug-in portion 4111 along the third direction Z is inserted into the liquid inlet port 402, and the other end is inserted into the liquid inlet port 111, so as to connect the fourth flow channel 71 with the sub-flow channel 420 in the first sub-plate 421 through the first accommodation cavity 410 in the first plug-in portion 4111. The first plug-in portion 4111 is detachably connected to the first wall 11. Fig.24 , Fig.38 as well as Fig.40A liquid outlet port 403 is provided on one side of the second sub-plate 422 along the third direction Z toward the first wall 11, and one end of the second plug-in portion 4112 along the third direction Z is inserted into the liquid outlet port 403, and the other end is inserted into the liquid outlet 112, so as to connect the liquid outlet 112 with the sub-channel 420 in the second sub-plate 422 through the first accommodating cavity 410 in the second plug-in portion 4112, and the second plug-in portion 4112 and the first wall 11 are detachably connected. The setting of the plug-in connector 41 enables the sub-channel 420 in the first sub-plate 421 to be connected to the liquid inlet 111, and enables the sub-channel 420 in the second sub-plate 422 to be connected to the liquid outlet 112, so that the heat-conducting fluid in the fourth channel 71 can enter the second channel 401 through the liquid inlet 111 and flow out through the liquid outlet 112 to form a cycle. The structural setting of the detachable connection between the first plug-in portion 4111 and the first wall 11 can drive the first sub-plate 421 away from the first wall 11 along the third direction Z by moving the first plug-in portion 4111 along the third direction Z. The structural design of the detachable connection between the second plug-in portion 4112 and the first wall 11 can be connected by the second plug-in portion 41 The movement of 12 along the third direction Z drives the second sub-board 422 along the third direction Z away from the first wall 11, thereby releasing the restriction of the first plug-in portion 4111 on the first sub-board 421 in the third direction Z and the first direction X, and releasing the restriction of the second plug-in portion 4112 on the second sub-board 422 in the third direction Z and the first direction X. The detachable connection structural design between the two connected sub-boards 42 allows the first sub-board 421 and / or the second sub-board 422 to be separated from the connected sub-board 42 along the second direction Y, thereby removing the first sub-board 421 and / or the second sub-board 422 from the box body 10 for subsequent maintenance, repair and replacement, thereby improving the safety and service life of the battery pack 1.

[0139] In some embodiments, reference Figure 7~Figure 9 The valve body 60 is disposed in the first accommodation cavity 410 of the first plug-in portion 4111. Along the first direction X, a flow guide opening 4113 communicating with the first accommodation cavity 410 is provided on one side of the first plug-in portion 4111 facing the first single plate 51. The valve body 60 is disposed in the first plug-in portion 4111 to ensure the installation stability of the valve body 60 in the plug-in component 41. When the fluid pressure of the valve body 60 reaches the second pressure threshold, the heat transfer fluid entering the valve body 60 can enter the third flow channel 510 of the first single plate 51 through the flow guide opening 4113 and the flow guide port 611.

[0140] In some embodiments, reference Figure 8~Figure 9 , Figure 17-18 , Fig.19 , Fig. 22 , Fig.36 as well as Fig.38The connector 41 also includes a connecting portion 412 and a connecting rod 413. Along the second direction Y, a connecting portion 412 is respectively provided on the outer sides of the opposite ends of the first liquid cold plate 40. The connecting portion 412 is connected to the adjacent plug-in portion 411 through the connecting rod 413. The connecting portion 412 can drive the connected plug-in portion 411 to move along the third direction Z through the connecting rod 413, so that the plug-in portion 411 is separated from the first wall 11, that is, the connecting portion 412 can drive the connected first plug-in portion 4111 to move along the third direction Z through the connecting rod 413, so that the first plug-in portion 4111 is separated from the first wall 11, and the connecting portion 412 can drive the connected second plug-in portion 4112 to move along the third direction Z through the connecting rod 413, so that the second plug-in portion 4112 is separated from the first wall 11. Specifically, there are two connecting parts 412, one connecting part 412 is arranged on the outer side of one end of the first sub-plate 421 away from the second sub-plate 422 along the second direction Y, and is connected to the first plug-in part 4111 through a connecting rod 413, and the other connecting part 412 is arranged on the outer side of one end of the second sub-plate 422 away from the first sub-plate 421 along the second direction Y, and is connected to the second plug-in part 4112 through a connecting rod 413. When the plug-in part 411 and the first wall 11 are separated, the plug-in part 411 can be moved. The connecting portion 412 makes the connecting portion 412 move away from the first wall 11 along the third direction Z. The connecting portion 412 drives the connected plug-in portion 411 to move along the third direction Z through the connecting rod 413, thereby driving the sub-board 42 (the first sub-board 421 or the second sub-board 422) connected to the plug-in portion 411 to move along the third direction Z until the plug-in portion 411 is separated from the first wall 11, thereby improving the convenience and efficiency of disassembly and avoiding the situation where the sub-board 42 is damaged due to direct separation of the plug-in portion 411 and the first wall 11.

[0141] In some embodiments, reference Figure 8~Figure 9 , Fig. 22 , Fig.36 as well as Figure 38~Figure 40 , the first liquid cooling plate 40 is provided with first through holes 404 communicating with the second flow channel 401 at opposite ends along the second direction Y, specifically, the first sub-plate 421 is provided with a first through hole 404 communicating with the second flow channel 401 at one end away from the second sub-plate 422, and the second sub-plate 422 is provided with a first through hole 404 communicating with the second flow channel 401 at one end away from the first sub-plate 421, and the connecting rod 413 is inserted into the first through hole 404 and can move in the first through hole 404 along the third direction Z, referring to Figure 4 , Figure 6 , Fig.14 , Figure 19~Figure 20 as well as Fig. 22A shielding portion 4114 is provided on one side of the plug-in portion 411 adjacent to the connecting portion 412 along the second direction Y, and the shielding portion 4114 extends along the third direction Z and blocks the first through hole 404. The shielding portion 4114 can shield and block the first through hole 404 to prevent the heat transfer fluid entering the second flow channel 401 from leaking to the outside of the first liquid cooling plate 40 through the first through hole 404, thereby ensuring the safety of the battery pack 1.

[0142] In some embodiments, reference Fig. 20 A sealing ring 4115 is sleeved on the plug-in part 411. Specifically, a sealing ring 4115 is sleeved on the first plug-in part 4111 to form a seal between the first plug-in part 4111 and the liquid inlet 111. A sealing ring 4115 is sleeved on the second plug-in part 4112 to form a seal between the second plug-in part 4112 and the liquid outlet 112.

[0143] In some embodiments, reference Figure 8~Figure 9 , Fig.17 , Fig. 20 , Fig. 22 , Fig.24 , Figure 35-36 as well as Fig.38 The first liquid cooling plate 40 further includes a second elastic member 43, referring to Figure 5~Figure 9 , Fig. 22 , Fig.24 , Fig.26 , Fig.28 , Figure 33~Figure 36 as well as Figure 38~Figure 40 , the first liquid cooling plate 40 is provided with a crimping portion 405 at two opposite ends along the second direction Y, specifically, the first sub-plate 421 is provided with a crimping portion 405 at one end away from the second sub-plate 422, and the second sub-plate 422 is provided with a crimping portion 405 at one end away from the first sub-plate 421, and the crimping portion 405 is provided with a first slot 4051 on one side of the crimping portion 405 facing the first wall 11 along the third direction Z, referring to Fig. 9 , Fig. 22 , Fig.36 as well as Fig.38 , along the third direction Z, the connecting portion 412 is inserted into the first slot 4051, referring to Figure 8~Figure 9 , Figure 17-18 , Fig. 22 , Fig.36 as well as Fig.38 The connecting portion 412 is provided with a second accommodating cavity 4120 penetrating the connecting portion 412. Fig. 20Along the third direction Z, one end of the connecting portion 412 adjacent to the first wall 11 is connected to a receiving portion 4121, and the receiving portion 4121 abuts against the first wall 11. The second elastic member 43 is arranged in the second accommodating cavity 4120. One end of the second elastic member 43 along the third direction Z is inserted into the first slot 4051, and the other end abuts against the receiving portion 4121. Along the third direction Z, the connecting portion 412 can move in the first slot 4051 and squeeze the second elastic member 43 through the receiving portion 4121 to drive the crimping portion 405 away from the first wall 11. During the disassembly of the first liquid cooling plate 40, a tool can be inserted into the gap between the receiving portion 4121 and the first wall 11 and the receiving portion 4121 can be pushed upward, and the receiving portion 4121 squeezes the second elastic member 43, and the second elastic member 43 pushes the crimping portion 405 away from the first wall 11 along the third direction Z. At the same time, the connecting portion 412 drives the connected plug-in portion 411 away from the first wall 11 along the third direction Z through the connecting rod 413. The provision of the second elastic member 43 can protect the crimping portion 405, avoid damage to the first liquid cooling plate 40 during the disassembly process, and improve the reuse rate of the disassembled first liquid cooling plate 40.

[0144] In some embodiments, reference Fig. 20 A ventilation hole 4122 is provided on the receiving portion 4121. The provision of the ventilation hole 4122 can ensure the consistency of the pressure inside and outside the crimping portion 405 when the connecting portion 412 moves in the first slot 4051 of the crimping portion 405, thereby ensuring the smoothness of the connecting portion 412 moving along the third direction Z in the first slot 4051, ensuring the smoothness of the connecting portion 412 driving the plug-in portion 411 to move along the third direction Z through the connecting rod 413, and ensuring the smoothness of the removal of the first liquid cooling plate 40.

[0145] In some embodiments, reference Figure 7~Figure 9 , Fig.17 , Fig.19 , Fig.26 , Fig.28 , Figure 33~Figure 36 as well as Fig.38 The first liquid cooling plate 40 further includes a second elastic member 43 and a support member 44, referring to Figure 5~Figure 9 , Fig. 22 , Fig.24 , Fig.26 , Fig.28 , Figure 33~Figure 36 as well as Figure 38~Figure 40, the first liquid cooling plate 40 is respectively provided with a crimping portion 405 at two opposite ends along the second direction Y, specifically, the first sub-plate 421 is provided with a crimping portion 405 at one end away from the second sub-plate 422, and the second sub-plate 422 is provided with a crimping portion 405 at one end away from the first sub-plate 421, and the crimping portion 405 is provided with a first slot 4051 on one side of the crimping portion 405 facing the first wall 11 along the third direction Z, and the connecting portion 412 is inserted into the first slot 4051 along the third direction Z, referring to Figure 8~Figure 9 , Figure 17-18 , Fig. 22 , Fig.36 as well as Fig.38 The connecting portion 412 is provided with a second accommodating cavity 4120 penetrating the connecting portion 412. Fig. 22 , Fig.26 as well as Fig.28 The support member 44 is arranged on the first wall 11 along the third direction Z, the connecting portion 412 is arranged on the side of the support member 44 facing away from the first wall 11, the second elastic member 43 is arranged in the second accommodating cavity 4120, one end of the second elastic member 43 is inserted into the first slot 4051, and the other end abuts against the support member 44. Along the third direction Z, the support member 44 can move in the direction away from the first wall 11, and can drive the connecting portion 412 to move in the first slot 4051 and squeeze the second elastic member 43. The setting of the support member 44 allows a tool to be inserted into the gap between the support member 44 and the first wall 11 when disassembling the first liquid cooling plate 40, and then moved in the third direction Z away from the first wall 11, thereby squeezing the second elastic member 43 through the support member 44 to push the crimping portion 405, so as to drive the connecting portion 412 to move away from the first wall 11 along the third direction Z. The connecting portion 412 drives the plug-in portion 411 to move away from the first wall along the third direction Z through the connecting rod 413 until the plug-in portion 411 is separated from the first wall 11, so that the subsequently connected sub-plate 42 can be separated along the second direction Y, thereby improving the convenience of disassembly of the first liquid cooling plate 40.

[0146] In some embodiments, reference Fig.17 and Fig.19 The support member 44 includes a second body 441, along the third direction Z, with reference to Figure 22~Figure 24 as well as Figure 26~Figure 30The first wall 11 is provided with a first protrusion 113 on a side away from the first flow channel plate 20 along the third direction Z, the second body 441 is provided on the first wall 11, and a slot 442 is provided on a side of the second body 441 facing the first wall 11, the second body 441 is connected to the first protrusion 113 by the slot 442, one end of the second elastic member 43 along the third direction Z is inserted into the first slot 4051, and the other end is in contact with the second body 441, the second body 441 can move in a direction away from the first wall 11, and the support member 44 drives the connecting part 412 to move in the first slot 4051 through the second body 441 and squeeze the second elastic member 43. The structural design of the support member 44 being connected to the first protrusion 113 by the slot, and there being a gap between the second body 441 and the first protrusion 113 along the third direction Z, thereby improving the convenience of disassembly of the first liquid cooling plate 40 and ensuring the convenience of assembly between the first liquid cooling plate 40 and the first wall 11.

[0147] In some embodiments, reference Fig.19 The second body 441 is provided with an exhaust hole 4410 which penetrates the second body 441 along the third direction Z. The exhaust hole 4410 can ensure the consistency of the pressure inside and outside the crimping part 405 when the connecting part 412 moves in the first slot 4051 of the crimping part 405, thereby ensuring the smoothness of the movement of the connecting part 412 in the first slot 4051 along the third direction Z, ensuring the smoothness of the movement of the plug-in part 411 along the third direction Z driven by the connecting part 412 through the connecting rod 413, and ensuring the smoothness of the removal of the first liquid cooling plate 40.

[0148] In some embodiments, reference Fig.17 and Fig.19 The support member 44 also includes a second limiting portion 443. Along the first direction X, two opposite ends of the second main body 441 are respectively provided with a second limiting portion 443. A guide cavity 4430 is defined between the two second limiting portions 443. Along the third direction Z, the crimping portion 405 is inserted into the guide cavity 4430. The two second limiting portions 443 cooperate to form a guide for the crimping portion 405 to move along the third direction Z. Moreover, the two second limiting portions 443 cooperate to limit the crimping portion 405 along the first direction X, thereby ensuring the assembly stability of the first liquid cooling plate 40 in the box body 10.

[0149] In some embodiments, reference Fig.21 , Fig.23 , Figure 33~Figure 35 , Fig.37 as well as Figure 42~Figure 44The first liquid cooling plate 40 further includes a connector 45, the connector 45 includes a third body 451, the third body 451 is inserted into the first wall 11 along the third direction Z, the third body 451 is arranged between two adjacent sub-plates 42 along the second direction Y, the third body 451 is arranged between the first sub-plate 421 and the second sub-plate 422, and a second through hole 4511 penetrating the third body 451 along the second direction Y is provided on the third body 451, and opposite ends of the third body 451 along the second direction Y are respectively connected with adjacent sub-plates 42 by snapping, specifically, one end of the third body 451 is connected with the first sub-plate 421 by snapping, and the other end is connected with the second sub-plate 422 by snapping, and the sub-channels 420 in the two adjacent sub-plates 42 are connected through the second through hole 4511 to form the second channel 401, specifically as shown in FIG. Fig.21 as well as Fig.23 In the illustrated embodiment, the sub-channels 420 in the first sub-plate 421 and the second sub-plate 422 are connected through the second through hole 4511 to form the second channel 401. The arrangement of the connector 45 can realize a detachable connection between two adjacent sub-plates 42 along the second direction Y, thereby improving the assembly convenience of the first liquid cooling plate 40.

[0150] In some embodiments, reference Fig.23 , Figure 29~Figure 30 Along the third direction Z, the first protrusion 113 is provided with a second slot 1131 at one end facing the first flow channel plate 20. The second slot 1131 includes two slot walls 1132 arranged opposite to each other along the second direction Y. Fig.23 , Fig.37 as well as Figure 42~Figure 43 Along the third direction Z, the third body 451 is provided with a clamping portion 4512 protruding from one end adjacent to the first wall 11, and the clamping portion 4512 is inserted into the second slot 1131 and is clamped and connected to the slot wall 1132. Specifically, referring to Fig.23 as well as Fig.30 A bayonet 1133 is provided on the groove wall 1132, and the clamping portion 4512 is inserted into the second slot 1131 and clamped and connected with the bayonet 1133, thereby ensuring the assembly stability between the third body 451 and the first wall 11 and improving the disassembly convenience between the third body 451 and the first wall 11.

[0151] In some embodiments, reference Fig.21 , Fig.23 , Fig.37 , Fig.42 as well as Fig.44The connector 45 further includes a clamping member 452. At least one clamping member 452 is respectively provided at two opposite ends of the third body 451 along the second direction Y. The clamping member 452 is inserted into the second through hole 4511. The clamping member 452 is provided with a third through hole 4521 penetrating the clamping member 452 along the second direction Y. One end of the clamping member 452 is inserted into the second through hole 4511 of the third body 451, and the other end is clamped and connected with the adjacent sub-board 42. Fig.21 and Fig.23 In the illustrated embodiment, along the second direction Y, the clamping member 452 disposed at one end of the third body 451 is clamped and connected with the first sub-plate 421, and the clamping member 452 disposed at the other end of the third body 451 is clamped and connected with the second sub-plate 422, and the sub-flow channels 420 in the first sub-plate 421 and the second sub-plate 422 are connected through the third through hole 4521 and the second through hole 4511. The provision of the clamping member 452 facilitates the clamping connection between the third body 451 and the sub-plate 42, thereby ensuring the assembly stability between the third body 451 and the sub-plate 42, and can improve the convenience of disassembly between the third body 451 and the sub-plate 42.

[0152] In some embodiments, reference Fig.23 , Fig.37 , Fig.42 as well as Fig.44 The end of the clamping member 452 away from the third body 451 along the second direction Y is provided with a spring piece 4522. The provision of the spring piece 4522 facilitates the assembly and disassembly between the sub-board 42 and the third body 451. Specifically, refer to Fig.23 as well as Fig.37 A snap-fitting portion cooperating with the spring sheet 4522 is provided at one end of the sub-board 42 adjacent to the third main body 451 along the second direction Y. The spring sheet 4522 cooperates with the snap-fitting portion to form a snap-fit ​​connection between the third main body 451 and the sub-board 42. The snap-fitting portion and the spring sheet 4522 can be arranged in an arc shape to facilitate the separation of the spring sheet 4522 from the snap-fitting portion.

[0153] In some embodiments, reference Figure 7~Figure 9 , Figure 21~Figure 24 as well as Fig.33 The number of sub-plates 42 in the first liquid cooling plate 40 is two, including a first sub-plate 421 and a second sub-plate 422 connected along the second direction Y.

[0154] In some embodiments, reference Figures 34 to 38 as well as Fig.41 The number of sub-plates 42 in the first liquid cooling plate 40 is more than three, including a first sub-plate 421, a second sub-plate 422 and at least one third sub-plate 423, as shown in FIG. Figure 12~Figure 13In the illustrated embodiment, the number of the third sub-board 423 is one, and the first sub-board 421, the third sub-board 423, and the second sub-board 422 are sequentially connected along the second direction Y by the connecting member 45. Along the second direction, the first sub-board 421 is detachably connected to the connected third sub-board 423, and the second sub-board 422 is detachably connected to the connected third sub-board 423. In some implementations, the number of the third sub-board 423 is more than two, and more than two third sub-boards 423 are disposed between the first sub-board 421 and the second sub-board 422, and are sequentially connected along the second direction Y, and the more than two connected third sub-boards 423 are detachably connected.

[0155] In some embodiments, the box body 10 is integrally formed by a die-casting process. The box body 10 is integrally formed, which can reduce manufacturing costs and improve the manufacturing efficiency of the battery pack 1.

[0156] 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 first flow channel plate is arranged on a side of the first wall facing the second wall, and a first flow channel is arranged on a side of the first flow channel plate facing the second wall; A battery cell, disposed on the first flow channel plate; a first liquid cooling plate, arranged on the first flow channel plate and abutting against the battery monomer along the first direction, the first liquid cooling plate having a second flow channel for the flow of a heat transfer fluid therein, and a liquid inlet port communicating with the second flow channel being provided on a surface of the first liquid cooling plate facing the first wall along the third direction, the liquid inlet port being arranged opposite to the liquid inlet; A second liquid cooling plate, arranged on the first flow channel plate, comprises a first single plate abutting against the battery cell along the second direction, a third flow channel for heat transfer fluid to flow is arranged inside the first single plate, a liquid inlet end of the third flow channel faces the liquid inlet, and a liquid outlet end of the third flow channel is communicated with the first flow channel; a valve body, inserted in the liquid inlet port to block the liquid inlet and the second flow channel, 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 second 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.

2. The battery pack according to claim 1, 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 diversion 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 diversion cavity, and the second blocking portion can block the diversion port; 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 second flow channel can be connected; When the pressure on the first blocking portion reaches the second pressure threshold, the liquid inlet and the second 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.

3. The battery pack according to claim 2, 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 first flow channel plate is recessed to form a recessed portion, and one end of the first main body away from the first flow channel plate is internally connected with a first limiting portion, and the first 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 first limiting portion, and the other end abuts against the recessed portion; The first blocking portion is away from the first flow channel plate along the third direction, and the recessed portion presses the first elastic member.

4. The battery pack according to claim 3, 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 first limiting portion, and the first elastic member is sleeved on the guide column.

5. The battery pack according to claim 1, wherein: The battery pack further includes a second flow channel plate, which is arranged on a side of the first wall facing away from the second wall, and a fourth flow channel is arranged on a side of the second flow channel plate facing the first wall; A liquid outlet is formed at one end of the first wall away from the liquid inlet along the second direction, and the liquid inlet is connected to the fourth flow channel; Along the third direction, a liquid outlet port communicating with the second 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.

6. The battery pack according to claim 5, 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 fifth flow channel for the flow of heat-conducting fluid is provided inside the second single plate. The liquid inlet end of the fifth flow channel is connected to the first flow channel, and the liquid outlet end of the fifth flow channel is connected to the liquid outlet.

7. The battery pack according to claim 6, 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 sixth 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 sixth flow channel are respectively connected to the first flow channel.

8. The battery pack according to claim 7, 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; The first liquid cooling plate includes a first sub-plate and a second sub-plate, the first sub-plate is connected to the second sub-plate along the second direction, and the first sub-plate and the second sub-plate are respectively in contact with the first surface or the second surface along the first direction; 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 directly contact the heat transfer fluid in the first flow channel.

9. The battery pack according to claim 8, characterized in that: Along the third direction, opposite ends of the first single plate are respectively 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 first 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, the liquid inlet end and the liquid outlet end of the fifth flow channel are respectively opened on the second bent portions adjacent to the first flow channel plate, one of the second bent portions abuts against the fifth surface of the battery cell, and the other 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 sixth 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.

10. The battery pack according to claim 5, characterized in that: The first liquid cooling plate includes a connector, a first sub-plate and a second sub-plate; Sub-channels for the heat transfer fluid to flow are respectively provided inside the first sub-plate and the second sub-plate, and along the second direction, the first sub-plate is connected to the second sub-plate, and the sub-channels are connected to form the second channel; The first sub-board is inserted into the liquid inlet through the plug-in component, and the second sub-board is inserted into the liquid outlet through the plug-in component to connect the fourth flow channel with the second 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.

11. The battery pack according to claim 10, characterized in that: The plug connector comprises a plug-in portion, The plug-in portion comprises a first plug-in portion and a second plug-in portion spaced apart along the second direction; Along the third direction, the liquid inlet port is provided 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, a first accommodating cavity penetrating the first plug-in portion is provided inside the first plug-in portion to connect the liquid inlet port and 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, a first accommodating cavity penetrating the second plug-in portion is provided inside the second plug-in portion to connect the liquid outlet port and 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 part. Along the first direction, a flow guide opening communicating with the first accommodating cavity is opened on one side of the first plug-in part facing the first single plate, and the flow guide opening is communicated with the flow guide port.

12. The battery pack according to claim 11, characterized in that: The plug connector also includes a connecting portion and a connecting rod; Along the second direction, the outer side of the first sub-board facing away from the end of the second sub-board is provided with the connecting portion, and the outer side of the second sub-board facing away from the end of the first sub-board is provided with the connecting portion; Along the second direction, the first plug-in portion is connected to the adjacent connecting portion through a connecting rod, and the second plug-in portion is connected to the adjacent connecting portion through a connecting rod; The connecting portion can drive the connected first plug-in portion to move along the third direction through the connecting rod, so that the first plug-in portion is separated from the first wall; The connecting portion can drive the connected second plug-in portion to move along the third direction through a connecting rod, so that the second plug-in portion is separated from the first wall.

13. The battery pack according to claim 12, characterized in that: Along the second direction, a first through hole communicating with the second flow channel is formed at one end of the first sub-plate away from the second sub-plate, and a first through hole communicating with the second flow channel is formed at one end of the second sub-plate away from the first sub-plate; The connecting rod is inserted into the first through hole and can move in the first through hole along the third direction; Along the second direction, a shielding portion is provided on a side of the first plug-in portion adjacent to the connected connecting portion, and a shielding portion is provided on a side of the second plug-in portion adjacent to the connected connecting portion; The shielding portion extends along the third direction and shields the first through hole.

14. The battery pack according to claim 13, wherein: The first liquid cooling plate further includes a second elastic member; Along the second direction, a crimping portion is provided at one end of the first sub-board away from the second sub-board, and a crimping portion is provided at one end of the second sub-board away from the first sub-board; The crimping portion is provided with a first slot on one side thereof 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 first 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.

15. The battery pack according to claim 13, characterized in that: The first liquid cooling plate further includes a second elastic member and a supporting member; Along the second direction, a crimping portion is provided at one end of the first sub-board away from the second sub-board, and a crimping portion is provided at one end of the second sub-board away from the first sub-board; The crimping portion is provided with a first slot on one side thereof 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 first 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.

16. The battery pack according to claim 15, 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 first flow channel plate, the second body is provided on the first wall, a slot is provided on a side of the second body facing the first wall, and the second body is connected to the first protrusion by snapping through the slot; 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.

17. The battery pack according to claim 16, wherein: The support member further includes a second limiting portion; Along the first direction, a second limiting portion is respectively provided at the opposite ends of the second main body, and a guide cavity is defined between the two second limiting portions. Along the third direction, the second limiting portion penetrates the first flow channel plate, and the crimping portion is inserted into the guide cavity. The two second limiting portions cooperate to limit the movement of the crimping portion along the third direction.

18. The battery pack according to claim 17, wherein: A plurality of second protrusions are provided on one surface of the first flow channel plate 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 protruding from a surface of the first flow channel plate away from the first wall along the third direction, and the first 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.

19. The battery pack according to claim 10, 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 first 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 of the third body 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.

20. The battery pack according to claim 19, wherein: Along the third direction, a first protrusion is provided on one side of the first wall facing the first flow channel plate, and a second slot is provided on one end of the first protrusion facing the first 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.

21. The battery pack according to claim 20, 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-flow channels in the first sub-plate and the second sub-plate are communicated along the second direction through the third through hole and the second through hole.

22. The battery pack according to claim 10, 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; Along the second direction, the first sub-board is detachably connected to the connected third sub-board, and the second sub-board is detachably connected to the connected third sub-board.

23. The battery pack according to claim 5, characterized in that: A liquid inlet channel, a liquid outlet channel and a branch channel are further provided on one side of the second channel plate facing the first wall, wherein the liquid outlet channel and the branch channel extend along the first direction respectively and are spaced apart along the second direction; Along the first direction, the liquid outlet end of the liquid inlet channel is connected with the branch channel; Along the second direction, one end of the fourth flow channel away from the liquid inlet is connected to the branch flow channel, and one end of the fourth flow channel adjacent to the liquid inlet is connected to the liquid inlet along the third direction; The liquid outlet is communicated with the liquid outlet channel along the third direction, and the liquid outlet end of the fifth channel is communicated with the liquid outlet channel.

24. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 23, the battery pack provides the electrical energy required for the electrical device to work.

Images