Battery pack and electric device

Abstract

The invention discloses a battery pack and a power utilization device, and belongs to the technical field of batteries, the battery pack is characterized in that a liquid inlet and a liquid outlet are formed in a first wall of a box body, a runner plate is arranged on one surface of the first wall, a liquid inlet runner, a plurality of first branch runners and a plurality of second branch runners are arranged on the runner plate, the liquid inlet is communicated with the first branch runners, and the liquid outlet is communicated with the second branch runners; the liquid inlet flow channel and the first branch flow channels are arranged at intervals in the first direction, the liquid inlet flow channel is communicated with the adjacent first branch flow channels, every two adjacent first branch flow channels are communicated through second branch flow channels, and the number of the second branch flow channels between every two adjacent first branch flow channels is decreased from the end close to the liquid inlet flow channel to the end away from the liquid inlet flow channel. Through the change of the number of the second branch flow channels, the pressure of the heat-conducting fluid entering the first branch flow channels is adjusted, so that the pressure of the heat-conducting fluid in the plurality of first branch flow channels is more balanced, the temperature uniformity of the single batteries at different positions is better, and the use safety of the battery pack is ensured.

Description

Technical Field

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

[0002] The temperature of the battery cells in the battery pack is regulated by a liquid cooling plate, but the flow control accuracy of the heat transfer fluid entering the liquid cooling plate is poor. The fluid pressure of the heat transfer fluid close to the liquid inlet end is relatively large, but as the heat transfer fluid flows away from the liquid inlet end, the fluid pressure of the heat transfer fluid decreases, which results in a relatively small flow of the heat transfer fluid entering the liquid cooling plate away from the liquid inlet end, resulting in poor temperature regulation effect of the battery cells on the liquid cooling plate far from the liquid inlet port, 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 the fluid pressures generated by the heat transfer fluid at different positions in the current battery pack are quite different.

[0004] A first aspect of an embodiment of the present application provides a battery pack, the battery pack having a first direction, a second direction and a third direction intersecting in pairs, and characterized in that the battery pack comprises: a box body, with a accommodating cavity provided therein, the box body comprising a first wall and a second wall arranged opposite to each other along the third direction, the first wall having a liquid inlet at one end along the second direction and a liquid outlet at the other end; a flow channel plate, arranged on a side of the first wall away from the second wall, the flow channel plate having a liquid inlet channel, a plurality of first branch channels and a plurality of second branch channels on a side facing the first wall, the liquid inlet being connected to the first branch channel; along the first direction, a plurality of the first branch channels are arranged at intervals, the liquid inlet channel is connected to adjacent first branch channels, the second branch channel is arranged between two adjacent first branch channels, the two adjacent first branch channels are connected through the second branch channel, and the number of the second branch channels between two adjacent first branch channels decreases from one end close to the liquid inlet channel to one end away from the liquid inlet channel.

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

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

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

[0008] Optionally, the battery pack also includes a battery cell and a liquid cooling plate; the battery cell and the liquid cooling plate are both arranged in the accommodating cavity, and the battery cell abuts the liquid cooling plate along the first direction; a flow channel is provided inside the liquid cooling plate; the liquid cooling plate includes a plurality of connectors, and includes a first sub-plate and a second sub-plate, and sub-flow channels are respectively provided inside the first sub-plate and the second sub-plate, and along the second direction, the first sub-plate and the second sub-plate are connected, and the sub-flow channels are connected to form the flow channel; the first sub-plate is inserted into the liquid inlet through the connector, and the second sub-plate is inserted into the liquid outlet through the connector to connect the first branch flow channel with the flow channel; the connector is detachably connected to the first wall, and the first sub-plate and the second sub-plate are detachably connected.

[0009] The detachable connection between the 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 liquid cooling plate, facilitate subsequent maintenance and recycling of the liquid cooling plate, and reduce manufacturing costs.

[0010] Optionally, the connector includes a plug-in portion, the plug-in portion includes a first plug-in portion and a second plug-in portion arranged at intervals along the second direction; along the third direction, a liquid inlet port connected to the flow channel is provided on a side of the first sub-board facing the first wall, one end of the first plug-in portion is inserted in the liquid inlet port, and the other end is inserted in the liquid inlet port, a first accommodating cavity is provided inside the first plug-in portion, which passes through the first plug-in portion, so as to connect the liquid inlet port with the liquid inlet port, and the first plug-in portion is detachably connected to the first wall; along the third direction, a liquid outlet port connected to the flow channel is provided on a side of the second sub-board facing the first wall, one end of the second plug-in portion is inserted in the liquid outlet port, and the other end is inserted in the liquid outlet port, a first accommodating cavity is provided inside the second plug-in portion, which passes through the second plug-in portion, so as to connect the liquid outlet port with the liquid outlet port, and the second plug-in portion is detachably connected to the first wall.

[0011] The opening of the liquid inlet port on the first sub-board, the opening of the liquid outlet port on the second sub-board, and the setting of the first accommodating cavity in the first plug-in part and the second plug-in part, and the first plug-in part is inserted in the liquid inlet port and the liquid inlet, and the second plug-in part is inserted in the liquid outlet port and the liquid outlet, thereby ensuring the connection between the first flow channels and the flow channels, and the structural design of the first plug-in part and the second plug-in part being detachably connected to the first wall, facilitates the removal of the first sub-board and the second sub-board from the first wall of the box body, and the first sub-board and the second sub-board will not be damaged during the removal process, thereby ensuring the sustainable utilization of the liquid cooling plate and reducing the production cost of the battery pack.

[0012] 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.

[0013] The arrangement of the connecting part and the connecting rod enables the liquid cooling plate to be separated from the first wall by moving the connecting part during disassembly, and the connecting part drives the plug-in part to move along the third direction through the connecting rod, thereby avoiding the risk of damaging the plug-in part due to direct movement of the plug-in part, and improving the convenience and efficiency of disassembly and assembly of the liquid cooling plate.

[0014] Optionally, along the second direction, a first through hole connected to the 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 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 blocking portion is provided on one side of the first plug-in portion adjacent to the connected connecting portion, and a blocking portion is provided on one side of the second plug-in portion adjacent to the connected connecting portion; the blocking portion extends along the third direction and blocks the first through hole.

[0015] Optionally, the liquid cooling plate also includes an 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 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, a second accommodating cavity is provided inside the connecting portion, 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 elastic member is provided in the second accommodating cavity, one end of the 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 elastic member through the receiving portion to drive the crimping portion away from the first wall.

[0016] Optionally, the liquid cooling plate also includes an 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; the crimping portion is provided with a first slot on a side facing the first wall along the third direction; along the third direction, the connecting portion is inserted into the first slot, and a second accommodating cavity is provided inside the connecting portion that passes through the connecting portion, the support member 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 elastic member is arranged in the second accommodating cavity, one end of the 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 the support member can drive the connecting portion to move in the first slot and squeeze the elastic member.

[0017] Optionally, the support member includes a main body; along the third direction, a protrusion is provided on a side of the first wall facing away from the flow channel plate, the main body is arranged on the first wall, and a card slot is provided on a side of the main body facing the first wall, and the main body is card-connected to the protrusion through the card slot; the liquid inlet and the liquid outlet are arranged at opposite ends of the protrusion along the second direction; along the third direction, one end of the elastic member is inserted into the first slot, and the other end abuts against the main body, the main body can move in the direction away from the first wall, and the support member drives the connecting part to move in the first slot and squeeze the elastic member through the main body.

[0018] Optionally, the support member also includes a limiting portion; along the first direction, one limiting portion is respectively provided at the opposite ends of the main body, a guide cavity is defined between the two limiting portions, and along the third direction, the crimping portion is inserted into the guide cavity, and the two limiting portions cooperate to limit and guide the movement of the crimping portion along the third direction.

[0019] Optionally, the liquid cooling plate also includes a connecting member, which includes a main body; the main body is inserted into the first wall along the third direction, and the main body is arranged between the first sub-board and the second sub-board; along the second direction, a second through hole is opened on the main body, which passes through the main body, one end of the main body is connected to the first sub-board by a clip, and the other end of the main body is connected to the second sub-board by a clip, and the sub-channels in the first sub-board and the second sub-board are connected through the second through hole to form the channel.

[0020] Optionally, along the third direction, a protrusion is provided on a side of the first wall facing away from the flow channel plate, and a second slot is provided at an end of the protrusion facing away from the flow channel plate, and the second slot includes two slot walls arranged opposite to each other along the second direction; along the third direction, a clamping portion is protrudingly provided on one end of the main body adjacent to the first wall, and the clamping portion is inserted into the second slot and clamped and connected to the slot wall.

[0021] 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 main body, the clip-on member is inserted into the second through hole, a third through hole is provided on the clip-on member and 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 main body is clip-connected with the first sub-board, and the clip-on member provided at the other end of the main body is clip-connected with the second sub-board; the sub-channels in the first sub-board and the second sub-board are connected along the second direction through the third through hole and the second through hole.

[0022] 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, and 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 open ends, the fifth surface and the sixth surface respectively cover the open ends, and the first surface and the second surface are the surfaces with the largest surface areas; along the first direction, the first sub-board and the second sub-board are respectively abutted against the first surface or the second surface.

[0023] The optional liquid cooling plate includes a first sub-board, a second sub-board and at least one third sub-board, and the first sub-board, at least one third sub-board and the second sub-board are connected along the second direction; along the second direction, the first sub-board and the connected third sub-board are detachably connected, and the second sub-board and the connected third sub-board are detachably connected.

[0024] 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.

[0025] 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 liquid inlet and a liquid outlet on a first wall of a box body, a flow channel plate is provided on a side of the first wall facing away from the second wall, a liquid inlet flow channel, a plurality of first branch flow channels and a plurality of second branch flow channels are provided on a side of the flow channel plate facing the first wall, the liquid inlet on the first wall is connected with the first branch flow channel, the liquid inlet flow channel and the plurality of first branch flow channels are arranged at intervals along a first direction, and the liquid inlet flow channel is connected with adjacent first branch flow channels, two adjacent first branch flow channels are connected through a second branch flow channel, and the number of second branch flow channels between two adjacent first branch flow channels is determined by The pressure decreases from one end close to the liquid inlet channel to the end far away from the liquid inlet channel, thereby diverting and dividing the heat-conducting fluid entering the first branch channel through the second branch channel. By changing the number of the second branch channels, the flow cross-sectional area between two adjacent first branch channels is adjusted, thereby adjusting the pressure of the heat-conducting fluid entering the first branch channel, so that the pressure of the heat-conducting fluid in the multiple first branch channels spaced apart along the first direction is more balanced, so that the liquid cooling plates at different positions have similar regulating effects on the temperature of the battery cells they are abutting against, and the temperature uniformity of the battery cells at different positions is better, thereby ensuring the safe use of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application from a first angle;

[0028] Figure 2 is a schematic structural diagram of a battery pack provided in an embodiment of the present application from a second angle;

[0029] Figure 3 yes Figure 1 Exploded diagram of

[0030] Figure 4 is a schematic diagram of the structure of a flow channel plate in a battery pack provided in an embodiment of the present application;

[0031] Figure 5 yes Figure 4 A top view of

[0032] Figure 6 yes Figure 1 AA section view;

[0033] Figure 7 yes Figure 5 A schematic diagram of the enlarged structure at B;

[0034] Figure 8 yes Figure 5 A schematic diagram of the enlarged structure at C;

[0035] Fig. 9 yes Figure 5 A schematic diagram of the structure at D of FIG.

[0036] Fig.10 is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application after the box body is removed;

[0037] Fig.11 yes Fig.10 An enlarged schematic diagram of the partial structure at E in the middle;

[0038] Fig.12 yes Fig.10 An enlarged schematic diagram of the partial structure at F;

[0039] Fig.13 is a schematic diagram of the structure of a box in a battery pack provided in an embodiment of the present application;

[0040] Fig.14 yes Fig.13A schematic diagram of the enlarged structure at G;

[0041] Fig.15 It is a schematic structural diagram of the first type of liquid cooling plate in the battery pack provided in the embodiment of the present application;

[0042] Fig.16 This is a schematic diagram of the second structure of the liquid cooling plate in the battery pack provided in the embodiment of the present application;

[0043] Fig.17 yes Fig.16 HH sectional view;

[0044] Fig.18 yes Fig.17 A schematic diagram of the enlarged structure at position I;

[0045] Fig.19 yes Fig.17 A schematic diagram of the enlarged structure at J;

[0046] Fig. 20 is a schematic structural diagram of the first sub-plate in the liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0047] Fig.21 is a schematic structural diagram of the second sub-plate in the liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0048] Fig. 22 It is a schematic structural diagram of the third sub-plate in the liquid cooling plate of the battery pack provided in an embodiment of the present application;

[0049] Fig.23 It is a schematic diagram of the combined structure of the connector, the support member and the elastic member in the liquid cooling plate of the battery pack provided in the embodiment of the present application;

[0050] Fig.24 It is a structural schematic diagram of a connector in a liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0051] Fig.25 It is a schematic structural diagram of a support member in a liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0052] Fig.26 It is a schematic diagram of the combined structure of the connector and the elastic member in the liquid cooling plate of the battery pack provided in the embodiment of the present application;

[0053] Fig. 27 It is a structural schematic diagram of a connector in a liquid cooling plate of a battery pack provided in an embodiment of the present application;

[0054] Fig.28 It is a structural schematic diagram of the main body in the connector of the liquid cooling plate in the battery pack provided in the embodiment of the present application;

[0055] Fig.29 It is a structural schematic diagram of a clamping member in a connector of a liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0056] Fig.30 It is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0057] Description of main reference numerals:

[0058] 1. Battery pack;

[0059] 10. box body, 101. accommodating chamber, 1011. first compartment, 1012. second compartment, 11. first wall, 111. liquid inlet, 112. liquid outlet, 113. 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;

[0060] 20. flow channel plate, 201. liquid inlet flow channel, 202. first branch flow channel, 203. second branch flow channel, 204. liquid outlet flow channel, 21. first filling part, 210. first filling cavity, 22. second filling part, 220. second filling cavity;

[0061] 30. Battery cell, 31. First side, 32. Second side, 33. Third side, 34. Fourth side, 35. Fifth side, 36. Sixth side;

[0062] 40. Liquid cooling plate, 401. Flow channel, 402. Liquid inlet port, 403. Liquid outlet port, 404. First through hole, 405. Crimping portion, 4051. First slot, 41. Connector, 410. First accommodating cavity, 411. Connecting portion, 4111. First plugging portion, 4112. Second plugging portion, 4113. Blocking portion, 4114. Sealing ring, 412. Connecting portion, 4120. Second accommodating cavity, 4121. Receiving portion, 4122. Air vent, 413, connecting rod, 42, sub-plate, 420, sub-flow channel, 421, first sub-plate, 422, second sub-plate, 423, third sub-plate, 43, elastic member, 44, supporting member, 441, main body, 4410, exhaust hole, 442, slot, 443, limiting portion, 4430, guide cavity, 45, connecting member, 451, main body, 4511, second through hole, 4512, clamping portion, 452, clamping member, 4521, third through hole, 4522, spring piece;

[0063] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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%.

[0069] This 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.

[0070] In some embodiments, a battery pack 1 is provided, referring to Figure 1 to Figure 14 The battery pack 1 includes: a box body 10 and a flow channel plate 20. The battery pack 1 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figures 1 to 30 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0071] Reference Figure 1 , Figure 3 , Figure 6-7 , Fig. 9 as well as Figure 13-14 The box body 10 is provided with a receiving cavity 101 inside. The box body 10 includes a first wall 11 and a second wall 12 arranged opposite to each other along the third direction Z, and also includes a third wall 13 and a fourth wall 14 arranged opposite to each other along the first direction X. Figure 7 and Fig.13 A liquid inlet 111 is provided at one end of the first wall 11 along the second direction Y. Figure 3 , Fig. 9 and Fig.13 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 to Figure 3 as well as Fig.13 The third wall 13 is provided with a liquid inlet pipe 15 and a liquid outlet pipe 16, which are arranged at intervals along the second direction Y. One end of the liquid inlet pipe 15 is located outside the third wall 13, and the other end extends into the accommodating cavity 101 and passes through the first wall 11 along the third direction Z. Figure 1 , Figure 3 as well as Fig.13A 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.

[0072] Reference Figure 2 to Figure 12 The flow channel plate 20 is disposed on a side of the first wall 11 away from the second wall 12 along the third direction Z. The flow channel plate 20 is provided with a liquid inlet flow channel 201, a plurality of first branch flow channels 202 and a plurality of second branch flow channels 203 on a side of the flow channel plate 20 facing the first wall 11 along the third direction Z. Figure 7 The liquid inlet 111 on the first wall 11 is connected to the first branch channel 202 along the third direction Z, referring to Figure 3 to Figure 5 , along the first direction X, a plurality of first branch flow channels 202 are arranged at intervals, and the liquid inlet flow channel 201 is connected with the adjacent first branch flow channels 202. Specifically, the liquid inlet flow channel 201 extends along the first direction X, and the first branch flow channel 202 extends along the second direction Y. The plurality of first branch flow channels 202 are arranged at intervals along the first direction X, and one end of the liquid inlet flow channel 201 along the first direction X is connected with the adjacent first branch flow channel 202. Two adjacent first branch flow channels 202 along the first direction X are connected through the second branch flow channel 203, that is, the second branch flow channel 203 extends along the first direction X to connect the two adjacent first branch flow channels 202. Figure 4-5 , the number of the second branch flow channels 203 between two adjacent first branch flow channels 202 along the first direction X decreases from the end close to the liquid inlet flow channel 201 to the end away from the liquid inlet flow channel 201 along the first direction X. Among them, the liquid inlet pipe 15 extends into the accommodating cavity 101 and passes through one end of the first wall 11 to communicate with the liquid inlet flow channel 201, so as to inject heat transfer fluid into the liquid inlet flow channel 201 through the liquid inlet pipe 15.

[0073] The temperature of the battery cells in the battery pack is regulated and controlled by a liquid cooling plate, but the flow control accuracy of the heat-conducting fluid entering the liquid cooling plate is poor. Specifically, the pressure of the heat-conducting fluid near the liquid inlet end inside the liquid cooling plate is relatively large, and the flow rate is relatively fast. The liquid cooling plate has a better temperature regulation effect on the battery cells near the liquid inlet end. As the heat-conducting fluid moves away from the liquid inlet end, the flow rate of the heat-conducting fluid slows down, resulting in a relatively small pressure of the heat-conducting fluid inside the liquid cooling plate away from the liquid inlet end. The liquid cooling plate has a poor temperature regulation effect on the battery cells away from the liquid inlet end, resulting in poor temperature uniformity of the battery cells at different positions, affecting the safety of the battery cells, and then affecting the safety of the battery pack.

[0074] The battery pack 1 provided in the embodiment of the present application is provided with a liquid inlet 111 at one end of the first wall 11 of the box body 10 along the second direction Y, and a flow channel plate 20 is provided on a side of the first wall 11 of the box body 10 away from the second wall 12. The flow channel plate 20 is provided with a liquid inlet channel 201, a plurality of first branch channels 202 and a plurality of second branch channels 203 along the third direction Z toward the first wall 11. The liquid inlet 111 is connected with the first branch channel 202 along the third direction Z, and the liquid inlet channel 201 is connected with the plurality of first branch channels 202 at intervals along the first direction X, and the liquid inlet channel 201 is connected with the adjacent first branch channels 202. Two adjacent first branch channels 202 along the first direction X are connected through the second branch channel 203, and the number of second branch channels 203 between two adjacent first branch channels 202 increases from one end close to the liquid inlet channel 201 along the first direction X to the far end. The flow rate of the heat-conducting fluid between two adjacent first branch channels 202 is smaller, and the flow rate of the heat-conducting fluid between two adjacent first branch channels 202 is slower, and the effect of diverting and dividing the flow rate of the heat-conducting fluid in the first branch channel 202 is better, thereby reducing the fluid pressure and fluid velocity of the heat-conducting fluid in the first branch channel 202 close to one end of the liquid inlet channel 201, improving the uniformity of the fluid pressure and fluid velocity of the heat-conducting fluid entering the first branch channel 202 through the second branch channel 203, and then improving the temperature uniformity of the multiple battery cells spaced along the first direction X, improving the safety of the battery cells, and improving the safety of the battery pack 1.

[0075] In some embodiments, reference Figure 2 to Figure 5 The flow channel plate 20 includes a plurality of first filling portions 21. The plurality of first filling portions 21 are arranged at intervals along the first direction X. At least one first filling portion 21 is arranged between two adjacent first branch flow channels 202. Figure 3 to Figure 5 In the embodiment shown, a first filling portion 21 is disposed between two adjacent first branch flow channels 202. Figure 2 to Figure 5 as well as Fig.11 The first filling part 21 is provided with a first filling cavity 210 for accommodating the filling material. Figure 2 and Figure 5, the first filling part 21 has a dimension L mm along the second direction Y, and along the first direction X, the dimension L of the plurality of first filling parts 21 increases from the end close to the liquid inlet channel 201 to the end away from the liquid inlet channel 201. The second branch channel 203 is arranged between two adjacent first branch channels 202, and the first filling part 21 is also arranged between two adjacent first branch channels 202. Therefore, as the dimension S of the first filling part 21 increases, the number of the second branch channels 203 between two adjacent first branch channels 202 decreases, and the flow division and pressure division effect on the heat transfer fluid becomes weaker, thereby ensuring the uniformity of the fluid pressure and fluid velocity of the heat transfer fluid in the plurality of first branch channels 202, and improving the temperature uniformity of the plurality of battery cells 30 arranged at intervals along the first direction X. The first filling cavity 210 in the first filling part 21 is opened, and fillers, such as insulation materials such as insulation cotton, can be set in the first filling cavity 210, so as to reduce the energy loss of the heat-conducting fluid in the first branch channel 202 and the second branch channel 203 during the transmission process, thereby ensuring the temperature control effect of the heat-conducting fluid on the battery cell 30. In some implementations, the filler can be selected according to actual use requirements. In some implementations, the first filling cavity 210 penetrates the flow channel plate 20 along the third direction Z to form a through-hole structure, and the first filling cavity 210 can partially penetrate the flow channel plate 20 to form a groove structure. In some other implementations, two or more first filling parts 21 can be set between two first branch channels 202 adjacent to each other along the first direction X, and it is only necessary to ensure that the sum S of the dimensions of the two or more first filling parts 21 along the second direction Y increases from the end close to the inlet flow channel 201 to the end away from the inlet flow channel 201 along the first direction X.

[0076] In some embodiments, reference Figure 2 to Figure 5 as well as Figure 10-11The flow channel plate 20 also includes a second filling portion 22, which is arranged between two adjacent first branch channels 202 along the first direction X. A second filling cavity 220 for accommodating fillers is provided inside the second filling portion 22. Along the second direction Y, a second branch channel 203 is defined between the first filling portion 21 and the adjacent second filling portion 22, and a second branch channel 203 is defined between two adjacent second filling portions 22. Along the first direction X, the number of second filling portions 22 between two adjacent first branch channels 202 decreases from the end close to the liquid inlet channel 201 to the end away from the liquid inlet channel 201. The number of second branch channels 203 between two adjacent first branch channels 202 is determined by the number of second filling parts 22. The more the number of second filling parts 22, the more the number of second branch channels 203 defined and formed. The number of second filling parts 22 decreases from one end close to the liquid inlet channel 201 to one end away from the liquid inlet channel 201 along the first direction X, so that the number of second branch channels 203 decreases from one end close to the liquid inlet channel 201 to one end away from the liquid inlet channel 201 along the first direction X, forming a partial pressure and equal flow of the heat-conducting fluid in multiple first branch channels 202, ensuring the temperature control effect of the heat-conducting fluid on the battery cell 30. The second filling cavity 220 is opened, and a filler, such as a heat-insulating material such as heat-insulating cotton, can be set in the second filling cavity 220, thereby reducing the energy loss of the heat-conducting fluid in the first branch channel 202 and the second branch channel 203 during the transmission process, thereby ensuring the temperature control effect of the heat-conducting fluid on the battery cell 30. In some implementations, the filler can be selected according to actual use requirements.

[0077] In some embodiments, reference Figure 3 to Figure 6 , Figure 9-10 as well as Fig.12 , a liquid outlet channel 204 is provided on one side of the flow channel plate 20 along the third direction Z toward the first wall 11, the liquid outlet port 112 on the first wall 11 is connected with the liquid outlet channel 204 along the third direction Z, the liquid inlet is along the second direction Y, the liquid inlet channel 201 and the liquid outlet channel 204 are arranged at intervals, the first branch channel 202 and the liquid outlet channel 204 are arranged at intervals, and the heat transfer fluid entering the first branch channel 202 through the liquid inlet channel 201 can enter the liquid outlet channel 204 to form a circulation. Among them, one end of the liquid outlet pipe 16 is located outside the third wall 13, and the other end extends into the accommodating cavity 101 and passes through the first wall 11 along the third direction Z and is connected with the liquid outlet channel 204, so that the heat transfer fluid in the liquid outlet channel 204 is discharged from the outside of the box body 10 through the liquid outlet pipe 16, forming a circulation of the heat transfer fluid.

[0078] In some embodiments, reference Figure 1 , Figure 3 , Figure 6 to Figure 12 as well as Figures 15 to 30The battery pack 1 further includes a battery cell 30 and a liquid cooling plate 40. The battery cell 30 is disposed in the receiving cavity 101 of the box body 10. Specifically, the battery cell 30 is disposed in the first compartment 1011. Fig.30 The battery cell 30 is a square battery. The battery cell 30 includes a first surface 31 and a second surface 32 arranged opposite to each other along a first direction X, a third surface 33 and a fourth surface 34 arranged opposite to each other along a second direction Y, and a fifth surface 35 and a sixth surface 36 arranged opposite to each other 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 open ends. The fifth surface 35 and the sixth surface 36 cover the open ends respectively. The first surface 31 and the second surface 32 are surfaces with the largest surface areas.

[0079] Reference Figure 1 , Figure 3 , Figure 6 to Figure 12 , Figure 15 to Figure 21 , Figure 23-24 as well as Fig.26 The liquid cooling plate 40 is disposed in the accommodating cavity 101 of the box body 10. Figure 1 and Figure 3 In the embodiment shown, the liquid cooling plate 40 is disposed in the first compartment 1011, the liquid cooling plate 40 abuts against the battery cell 30 along the first direction X, and a flow channel 401 for the flow of the heat transfer fluid is provided inside the liquid cooling plate 40, referring to Figure 1 , Figure 3 , Figure 6 to Figure 10 , Figure 15 to Figure 24 as well as Fig.26 The liquid cooling plate 40 includes a connector 41 and a plurality of sub-plates 42 connected along the second direction Y, as shown in FIG. Figure 3 , Figure 6 to Figure 10 as well as Fig.15 In the embodiment shown, the liquid cooling plate 40 includes a first sub-plate 421 and a second sub-plate 422. Figure 7 The first sub-board 421 is inserted into the liquid inlet 111 through a plug-in component 41, referring to Fig. 9 The second sub-plate 422 is inserted into the liquid outlet 112 through a connector 41 to connect the first branch channel 202 and the channel 401. 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. Specifically, the first sub-plate 421 is connected to the second sub-plate 422 along the second direction Y, and the first sub-plate 421 is detachably connected to the second sub-plate 422.

[0080] By setting a flow channel 401 inside the liquid cooling plate 40, and the liquid cooling plate 40 includes a plug-in 41 and a first sub-plate 421 and a second sub-plate 422 connected along the second direction Y, the first sub-plate 421 is plugged into the liquid inlet 111 through a plug-in 41, and the second sub-plate 422 is plugged into the liquid outlet 112 through a plug-in 41, so as to connect the first branch flow channel 202 on the flow channel plate 20 with the flow channel 401, so that a plurality of liquid cooling plates 4 can be formed through one flow channel plate 20. 0 synchronous liquid supply, avoids the arrangement of the liquid supply pipeline and the liquid return pipeline in the accommodating chamber 101 of the box body 10, improves the internal space utilization rate of the box body 10, and the plug-in component 41 and the first wall 11 are detachably connected, so that when the liquid cooling plate 40 is damaged (for example, damage caused by excessive pressure of the heat transfer fluid entering the liquid cooling plate 40) or the liquid cooling plate 40 needs to be disassembled when the battery pack 1 is recycled, the plug-in component 41 can be detachably connected to the first wall 11 to remove the liquid cooling plate 40. The first sub-board 421 and the second sub-board 422 are detachably connected to each other, so that the first sub-board 421 and / or the second sub-board 422 separated from the first wall 11 can be moved along the second direction Y, so that the first sub-board 421 and / or the second sub-board 422 can be moved along the second direction Y to be connected to the sub-board 421 and / or the second sub-board 422. 42 is separated, so that the first sub-board 421 and / or the second sub-board 422 are removed from the box body 10, and the first sub-board 421 and / or the second sub-board 422 lose the restraint in the third direction Z. The remaining sub-boards 42 in the liquid cooling plate 40 that are not connected to the plug-in component 41 can be moved along the second direction Y. After the sub-boards 42 connected along the second direction Y are separated, they can be removed from the box body 10, so that the liquid cooling plate 40 can be repaired or applied to other battery packs, thereby reducing the manufacturing cost of the battery pack 1. In addition, the liquid cooling plate 40 includes a plurality of sub-boards 42 connected along the second direction Y, so that the liquid cooling plate 40 can form a spliced ​​structure, forming a modular structural design of the liquid cooling plate 40, and the independent processing of a plurality of sub-boards 42 can also improve the manufacturing efficiency of the liquid cooling plate 40 and reduce the manufacturing cost.

[0081] In some embodiments, along the first direction X, the 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 liquid cooling plate 40 , thereby improving the temperature control efficiency of the liquid cooling plate 40 on the battery cell 30 .

[0082] In some embodiments, reference Figure 6 to Figure 9 , Figure 17 to Figure 19 as well as Figure 21-22A 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 channel 401, thereby ensuring the smooth flow of the heat transfer fluid in the channel 401.

[0083] In some embodiments, reference Figure 3 , Figure 7 , Fig. 9 , Figure 11-12 , Figure 15 to Figure 18 , Figure 23-24 as well as Fig.26 , the plug connector 41 includes a plug connector portion 411, referring to Figure 7 , Fig. 9 , Figure 17-18 , 23~ Fig.24 as well as Fig.26 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 6-7 , Fig. 9 , Figure 11-12 as well as Figure 15 to Figure 18 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. Figure 7 and Fig.18 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 first branch flow channel 202 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. 9A 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 first branch channel 202 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 first branch channel 202 can enter the channel 401 through the liquid inlet 111, and flow into the liquid outlet channel 204 through the liquid outlet port 403 and the liquid outlet 112 to form a circulation. 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 realized by The movement of the second plug-in portion 4112 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. Due to the detachable connection structural design between the two connected sub-boards 42, the first sub-board 421 and / or the second sub-board 422 can 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.

[0084] The number of the second branch flow channels 203 between two adjacent first branch flow channels 202 decreases from the end close to the liquid inlet flow channel 201 along the first direction X to the end away from the liquid inlet flow channel 201. The heat transfer fluid entering the first branch flow channel 202 through the liquid inlet flow channel 201 enters the flow channel 401 of the liquid cooling plate 40 through the liquid inlet port 111 and the liquid inlet port 402 to regulate the temperature of the battery cell 30 abutting against the liquid cooling plate 40. The fluid pressure and flow rate of the heat transfer fluid entering the first branch flow channel 202 through the second branch flow channel 203 are controlled. The improvement of the uniformity of the body velocity can further improve the uniformity of the fluid pressure and fluid velocity of the heat-conducting fluid entering the liquid cooling plate 40 through the first branch flow channel 202, the liquid inlet 111 and the liquid inlet port 402, and improve the uniformity of the fluid pressure and fluid velocity of the heat-conducting fluid in the multiple liquid cooling plates 40 arranged at intervals along the first direction X, thereby achieving a flow equalization effect, improving the temperature uniformity of the multiple battery cells 30 arranged at intervals along the first direction X, improving the safety of the battery cells 30, and improving the safety of the battery pack 1.

[0085] In some embodiments, reference Figure 4 , Figure 6 , Fig.14 , Figure 19-20 as well as Fig. 22 The 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 liquid cooling 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.

[0086] In some embodiments, reference Figure 7 , Fig. 9 , Fig.18 , Figure 23-24 as well as Fig.26The plug-in 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 liquid cooling 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. Specifically, there are two connecting portions 412. One connecting portion 412 is provided 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 portion 4111 through a connecting rod 413. The other connecting portion 412 is provided 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 portion 4112 through a connecting rod 413. When the plug-in portion 411 and the first wall 11 are separated, the connecting portion 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.

[0087] In some embodiments, reference Fig. 9 , Fig.18 as well as Figure 20-21 , the liquid cooling plate 40 is provided with first through holes 404 communicating with the 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 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 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 7 , Fig. 9 , Fig.18 , Figure 23-24 as well as Fig.26 A blocking portion 4113 is provided on one side of the plug-in portion 411 adjacent to the connecting portion 412 along the second direction Y, and the blocking portion 4113 extends along the third direction Z and blocks the first through hole 404. The blocking portion 4113 can block and block the first through hole 404 to prevent the heat transfer fluid entering the flow channel 401 from leaking to the outside of the liquid cooling plate 40 through the first through hole 404, thereby ensuring the safety of the battery pack 1.

[0088] In some embodiments, reference Figure 3 , Figure 7 , Fig. 9 , Figure 11-12 , Figure 17-18 , Fig.23 as well as Fig.26 The liquid cooling plate 40 further includes an elastic member 43, referring to Figure 3 , Figure 7 , Fig. 9 , Figure 11-12 , Figure 15 to Figure 18 as well as Figure 20-21 , the 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. 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 Figure 7 , Fig. 9 and Fig.18 , along the third direction Z, the connecting portion 412 is inserted into the first slot 4051, referring to Figure 7 , Fig. 9 and Fig.18 The connecting portion 412 is provided with a second accommodating cavity 4120 penetrating the connecting portion 412. Fig.26 Along the third direction Z, the end of the connecting portion 412 adjacent to the first wall 11 is internally connected with a receiving portion 4121, and the receiving portion 4121 abuts against the first wall 11, referring to Figure 7 , Fig. 9 and Fig.18 The elastic member 43 is arranged in the second accommodating cavity 4120, one end of the elastic member 43 along the third direction Z is inserted into the first slot 4051, and the other end is abutted against the receiving portion 4121. Along the third direction Z, the connecting portion 412 can move in the first slot 4051 and squeeze the 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 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 elastic member 43, and the crimping portion 405 is pushed away from the first wall 11 along the third direction Z by the elastic member 43. 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 elastic member 43 can protect the crimping portion 405, avoid damage to the liquid cooling plate 40 during the disassembly process, and improve the reuse rate of the disassembled liquid cooling plate 40.

[0089] In some embodiments, reference Fig.26A 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 liquid cooling plate 40.

[0090] In some embodiments, reference Figure 3 , Figure 7 , Fig. 9 , Figure 11-12 , Figure 15 to Figure 18 , Fig.23 as well as Figure 25-26 The liquid cooling plate 40 further includes an elastic member 43 and a support member 44, referring to Figure 3 , Figure 7 , Fig. 9 , Figure 11-12 , Figure 15 to Figure 18 as well as Figure 20-21 , the 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. 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 Figure 7 , Fig. 9 and Fig.18 , along the third direction Z, the connecting portion 412 is inserted into the first slot 4051, referring to Figure 7 , Fig. 9 and Fig.18A second accommodating cavity 4120 is provided inside the connecting portion 412 and passes through the connecting portion 412. The support member 44 is arranged on the first wall 11 along the third direction Z. The connecting portion 412 is arranged on a side of the support member 44 away from the first wall 11. The elastic member 43 is arranged in the second accommodating cavity 4120. One end of the 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 a direction away from the first wall 11, and can drive the connecting portion 412 to move in the first slot 4051 and squeeze the 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 liquid cooling plate 40, and then moved in the direction away from the first wall 11 along the third direction Z, and then the elastic member 43 is squeezed by the support member 44 to push the crimping portion 405 to drive the connecting portion 412 away from the first wall 11 along the third direction Z. The connecting portion 412 drives the plug-in portion 411 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 liquid cooling plate 40.

[0091] In some embodiments, reference Fig.23 and Fig.25 The support member 44 includes a main body 441, along the third direction Z, with reference to Figure 3 , Figure 6 to Figure 9 as well as Figure 13-14 The first wall 11 is provided with a protrusion 113 on one side away from the flow channel plate 20 along the third direction Z, and the main body 441 is provided on the first wall 11. Fig.23 and Fig.25 The main body 441 has a slot 442 on one side facing the first wall 11, and the main body 441 is connected to the protrusion 113 by the slot 442. Fig.13 , the liquid inlet 111 and the liquid outlet 112 are arranged at opposite ends of the protrusion 113 along the second direction Y, one end of the elastic member 43 along the third direction Z is inserted into the first slot 4051, and the other end is in contact with the main body 441, the main body 441 can move in a direction away from the first wall 11, and the support member 44 drives the connecting portion 412 to move in the first slot 4051 and squeeze the elastic member 43 through the main body 441. The structural design of the support member 44 and the protrusion 113 being snap-connected, and there being a gap between the main body 441 and the protrusion 113 along the third direction Z, thereby improving the convenience of disassembly of the liquid cooling plate 40 and ensuring the convenience of assembly between the liquid cooling plate 40 and the first wall 11.

[0092] In some embodiments, reference Fig.25The main body 441 is provided with an exhaust hole 4410 which penetrates the main 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 liquid cooling plate 40.

[0093] In some embodiments, reference Fig.23 and Fig.25 The support member 44 further includes a limiting portion 443. Along the first direction X, two opposite ends of the main body 441 are respectively provided with a limiting portion 443. Fig.25 A guide cavity 4430 is defined between the two limiting portions 443, and the crimping portion 405 is inserted into the guide cavity 4430 along the third direction Z. The two limiting portions 443 cooperate to form a guide for the crimping portion 405 to move along the third direction Z, and the two limiting portions 443 cooperate to limit the crimping portion 405 along the first direction X, thereby ensuring the assembly stability of the liquid cooling plate 40 in the box body 10.

[0094] In some embodiments, reference Figure 3 , Figure 6 , Figure 8 , Fig.10 , Figure 15 to Figure 17 , Fig.19 as well as Figure 27-28 The liquid cooling plate 40 further includes a connector 45, the connector 45 includes a body 451, the body 451 is inserted into the first wall 11 along the third direction Z, the body 451 is arranged between two adjacent sub-plates 42 along the second direction Y, the body 451 is arranged between the first sub-plate 421 and the second sub-plate 422, a second through hole 4511 penetrating the body 451 along the second direction Y is provided on the body 451, and opposite ends of the body 451 along the second direction Y are respectively connected with adjacent sub-plates 42 by snapping, specifically, one end of the 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 channel 401, specifically as shown in FIG. Figure 3 , Figure 6 , Figure 8 , Fig.10 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 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 liquid cooling plate 40.

[0095] In some embodiments, reference Figure 8 as well as Figure 13-14 Along the third direction Z, the end of the protrusion 113 away from the flow channel plate 20 is provided with a second slot 1131, and the second slot 1131 includes two slot walls 1132 arranged opposite to each other along the second direction Y. Figure 8 , Fig.19 as well as Figure 27-28 Along the third direction Z, the end of the body 451 adjacent to the first wall 11 is protruded with a clamping portion 4512, which is inserted into the second slot 1131 and clamped and connected to the slot wall 1132. Specifically, refer to Figure 8 and Fig.14 A bayonet 1133 is provided on the groove wall 1132, and the clamping portion 4512 is inserted into the second slot 1131 and clamped with the bayonet 1133, thereby ensuring the assembly stability between the main body 451 and the first wall 11 and improving the disassembly convenience between the main body 451 and the first wall 11.

[0096] In some embodiments, reference Figure 8 , Fig.19 , Fig. 27 as well as Fig.29 The connector 45 further includes a clamping member 452. At least one clamping member 452 is respectively provided at two opposite ends of the body 451 along the second direction Y. The clamping member 452 is inserted into the second through hole 4511. A third through hole 4521 is provided on the clamping member 452 and passes through 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 body 451, and the other end is clamped and connected with the adjacent sub-board 42. Figure 6 and Figure 8 In the illustrated embodiment, along the second direction Y, the clamping member 452 disposed at one end of the body 451 is clamped and connected with the first sub-plate 421, and the clamping member 452 disposed at the other end of the 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 to form the flow channel 401. The provision of the clamping member 452 facilitates the clamping connection between the body 451 and the sub-plate 42, thereby ensuring the assembly stability between the body 451 and the sub-plate 42, and improving the disassembly convenience between the body 451 and the sub-plate 42.

[0097] In some embodiments, reference Figure 8 , Fig.19 , Fig. 27 as well as Fig.29 The end of the clamping member 452 away from the body 451 along the second direction Y is provided with a spring 4522, and the setting of the spring 4522 facilitates the assembly and disassembly between the sub-board 42 and the body 451. Specifically, refer to Figure 8 as well as Fig.19 A snap-fitting portion cooperating with the spring sheet 4522 is provided at one end of the sub-board 42 adjacent to the 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 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.

[0098] In some embodiments, reference Figure 3 , Figure 6 to Figure 10 , Fig.15 as well as Figure 20-21 The number of sub-plates 42 in the liquid cooling plate 40 is two, including a first sub-plate 421 and a second sub-plate 422 connected along the second direction Y.

[0099] In some embodiments, reference Figure 16 to Figure 22 The number of sub-boards 42 in the liquid cooling plate 40 is more than three, including a first sub-board 421, a second sub-board 422 and at least one third sub-board 423, as shown in FIG. Figure 16-17 In 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.

[0100] 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, the first wall having a liquid inlet at one end along the second direction and a liquid outlet at the other end; A flow channel plate is arranged on a side of the first wall facing away from the second wall, and a liquid inlet flow channel, a plurality of first branch flow channels and a plurality of second branch flow channels are arranged on a side of the flow channel plate facing the first wall, and the liquid inlet is connected to the first branch flow channels; Along the first direction, multiple first branch channels are arranged at intervals, the liquid inlet channel is connected to the adjacent first branch channel, the second branch channel is arranged between two adjacent first branch channels, and the two adjacent first branch channels are connected through the second branch channel. The number of the second branch channels between two adjacent first branch channels decreases from one end close to the liquid inlet channel to the end far away from the liquid inlet channel.

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

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

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

5. The battery pack according to claim 1, wherein: The battery pack also includes a battery cell and a liquid cooling plate; The battery cell and the liquid cooling plate are both disposed in the accommodating cavity, and the battery cell abuts against the liquid cooling plate along the first direction; A flow channel is provided inside the liquid cooling plate; The liquid cooling plate includes a plurality of connectors, and includes a first sub-board and a second sub-board, wherein sub-flow channels are respectively provided inside the first sub-board and the second sub-board, and along the second direction, the first sub-board and the second sub-board are connected, and the sub-flow channels are connected to form the flow 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 first branch flow channel with the 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.

6. The battery pack according to claim 5, characterized in that: The plug connector includes a plug part, and the plug part includes a first plug part and a second plug part spaced apart along the second direction; Along the third direction, a liquid inlet port communicating with the flow channel is provided on one side of the first sub-plate 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, 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, a liquid outlet port connected to the flow channel is provided on one side of the second sub-plate facing the first wall, one end of the second plug-in portion is inserted in the liquid outlet port, and the other end is inserted in the liquid outlet, and a first accommodating cavity penetrating the second plug-in portion is provided inside 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.

7. The battery pack according to claim 6, 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.

8. The battery pack according to claim 7, characterized in that: Along the second direction, a first through hole communicating with the 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 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 blocking portion is provided on a side of the first plug-in portion adjacent to the connected connecting portion, and a blocking portion is provided on a side of the second plug-in portion adjacent to the connected connecting portion; The blocking portion extends along the third direction and blocks the first through hole.

9. The battery pack according to claim 8, characterized in that: The liquid cooling plate further comprises an 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, 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 elastic member is provided in the second accommodating cavity, one end of the 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 elastic member through the receiving portion to drive the crimping portion away from the first wall.

10. The battery pack according to claim 8, characterized in that: The liquid cooling plate also includes an 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 is provided on the first wall, the connecting portion is provided on a side of the supporting member away from the first wall, the elastic member is provided in the second accommodating cavity, one end of the elastic member is inserted into the first slot, and the other end abuts against the supporting member; Along the third direction, the support member can move in a direction away from the first wall, and the support member can drive the connecting portion to move in the first slot and squeeze the elastic member.

11. The battery pack according to claim 10, characterized in that: The support member includes a main body; Along the third direction, a protrusion is provided on a side of the first wall facing away from the flow channel plate, the main body is provided on the first wall, a slot is provided on a side of the main body facing the first wall, and the main body is connected to the protrusion by snapping through the slot; The liquid inlet and the liquid outlet are arranged at two opposite ends of the protruding portion along the second direction; Along the third direction, one end of the elastic member is inserted into the first slot, and the other end is in contact with the main body. The 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 elastic member through the main body.

12. The battery pack according to claim 11, characterized in that: The support member further includes a limiting portion; Along the first direction, a limiting portion is respectively provided at the opposite ends of the main body, and a guide cavity is defined between the two limiting portions. Along the third direction, the crimping portion is inserted into the guide cavity, and the two limiting portions cooperate to limit and guide the crimping portion to move along the third direction.

13. The battery pack according to claim 5, characterized in that: The liquid cooling plate further comprises a connecting member, wherein the connecting member comprises a body; The body is inserted into the first wall along the third direction, and the body is arranged between the first sub-board and the second sub-board; Along the second direction, a second through hole is opened on the main body, which passes through the main body. One end of the main body is connected to the first sub-board by a clip, and the other end of the main 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 to form the channel.

14. The battery pack according to claim 13, wherein: Along the third direction, a side of the first wall facing away from the flow channel plate is provided with a protrusion, an end of the protrusion facing away from the flow channel plate is provided with a second slot, and the second slot includes two slot walls oppositely arranged along the second direction; Along the third direction, a clamping portion is protruded from one end of the body adjacent to the first wall, and the clamping portion is inserted into the second slot and clamped and connected with the slot wall.

15. The battery pack according to claim 13, characterized in that: The connecting piece also includes a clamping piece; Along the second direction, at least one of the clamping parts is respectively disposed at two opposite ends of the body, the clamping part is inserted into the second through hole, a third through hole penetrating the clamping part is formed on the clamping part, 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 body is clamped and connected to the first sub-board, and the clamping member disposed at the other end of the 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.

16. The battery pack according to claim 5, characterized in that: The battery cell comprises a first surface and a second surface arranged opposite to each other along the first direction, a third surface and a fourth surface arranged opposite to each other along the second direction, and a fifth surface and a sixth surface arranged opposite to each other along the third direction, the first surface, the third surface, the second surface and the fourth surface are sequentially connected end to end to form a shell structure with two open ends, the fifth surface and the sixth surface cover the two open ends respectively, and the first surface and the second surface are surfaces with the largest surface areas; Along the first direction, the first sub-board and the second sub-board abut against the first surface or the second surface respectively.

17. The battery pack according to claim 5, characterized in that: The liquid cooling plate comprises a first sub-plate, a second sub-plate and at least one third sub-plate, wherein 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.

18. An electrical device, characterized in that: It comprises a battery pack as claimed in any one of claims 1 to 17, wherein the battery pack provides the electrical energy required for the electrical device to work.

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