Battery pack and electric equipment

Abstract

According to the battery pack, a first flow guide cavity is formed in a first side wall, a support is arranged in a containing cavity of a box body, a second flow guide cavity is formed in the support, a protruding part is arranged on the first side wall, and a third flow guide cavity is formed in the protruding part; the battery monomers are overlapped with the bracket, a first through hole is formed in the supporting surface of the bracket, each battery monomer is provided with a first anti-explosion valve, the first anti-explosion valve is arranged opposite to the first through hole, and a second anti-explosion valve is arranged on the first side wall; the generated thermal runaway gas is discharged through the first anti-explosion valve, enters the second flow guide cavity through the first through hole, enters the first flow guide cavity through the third flow guide cavity and is discharged to the outer side of the box body through the second anti-explosion valve, so that the thermal runaway gas can be timely and smoothly discharged to the outer side of the box body, and the use safety of the single battery is improved; and the use safety of the battery pack is further ensured.

Description

Technical Field

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

[0002] In existing battery packs, the explosion-proof valve of a single cell is usually set at the top, that is, one end of the single cell adjacent to the cover plate. However, the area between the single cell and the cover plate usually needs to be arranged with a CCS component (integrated busbar) to realize operations such as data collection of the single cell. When a single cell has thermal runaway, it is necessary to discharge the gas generated inside through an explosion-proof valve. However, the presence of the CCS component will block and interfere with the discharged gas, resulting in difficulty in discharging heat from the battery pack in a timely and smooth manner, affecting the safety of the single cell, and then affecting the safety of the battery pack. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electrical device to solve the problem that heat cannot be discharged in time when thermal runaway occurs in a single battery in the current battery pack, affecting the safety of the battery pack.

[0004] According to a first aspect of an embodiment of the present application, there is provided a battery pack, the battery pack having a first direction and a third direction intersecting each other, the battery pack comprising: a box body, a housing chamber provided therein, the box body comprising a first side wall, a first guide chamber provided therein; a bracket, arranged in the housing chamber, a second guide chamber provided therein; a battery cell, arranged in the housing chamber, the battery cell and the bracket being stacked along the third direction, the bracket having a supporting surface facing the battery cell, a first through hole communicating with the second guide chamber being provided on the supporting surface, a first explosion-proof valve being provided at one end of the battery cell adjacent to the supporting surface, the first explosion-proof valve being arranged opposite to the first through hole; a second explosion-proof valve, inserted in the first side wall, an air inlet end of the second explosion-proof valve being communicated with the first guide chamber; a protrusion, protruding along the first direction on a side of the first side wall facing the battery cell, a third guide chamber provided therein, the third guide chamber being communicated with both the first guide chamber and the second guide chamber.

[0005] Optionally, in the first direction, one end of the bracket adjacent to the protrusion overlaps with the protrusion along the third direction, and the second guide cavity is connected to the third guide cavity.

[0006] Optionally, the protrusion includes a first surface and a second surface arranged opposite to each other along the third direction, and the first surface and the supporting surface are overlapped along the third direction; along the first direction, a second through hole is provided at one end of the supporting surface adjacent to the protrusion, and a third through hole is provided on the first surface, and the second through hole and the third through hole are arranged opposite to each other along the third direction to connect the second guide cavity with the third guide cavity; along the first direction, a protrusion is protrudingly provided on one end of the supporting surface adjacent to the protrusion, and a fourth through hole is provided on the first surface, and the protrusion is inserted into the fourth through hole.

[0007] Optionally, the battery pack also has a second direction, and the first direction, the second direction and the third direction intersect each other; the bracket includes at least one rib plate, and the rib plate is arranged in the second guide cavity, and the rib plate extends along the first direction to divide the second guide cavity into at least two guide channels arranged at intervals along the second direction, and at least two of the guide channels are connected to the first guide cavity and the third guide cavity.

[0008] Optionally, the battery pack further includes a fireproof plate, which is disposed between the battery cell and the bracket; the fireproof plate is constructed to be able to be broken through by the thermal runaway gas generated by the battery cell under a preset pressure.

[0009] Optionally, the battery pack further has a second direction, and the first direction, the second direction and the third direction intersect each other; the battery pack further includes: a plurality of liquid cooling plates, arranged in the accommodating cavity, the plurality of the liquid cooling plates are spaced apart along the second direction, the liquid cooling plate includes a first end and a second end relatively arranged along the first direction, a flow channel is provided inside the liquid cooling plate, the plurality of the liquid cooling plates include a first liquid cooling plate, a second liquid cooling plate and a plurality of third liquid cooling plates; at least one of the battery cells is provided between two adjacent liquid cooling plates along the second direction; a first current collector is arranged at a first end of the first liquid cooling plate, a first liquid inlet cavity, a first liquid outlet cavity and a liquid supply cavity are provided inside the first current collector, the first liquid inlet cavity and the first liquid outlet cavity are spaced apart and are respectively connected to the flow channel, The liquid supply chamber is connected with the first liquid inlet chamber and is spaced apart from the first liquid outlet chamber; the second current collector is arranged at the first end of the second liquid cooling plate, and the second liquid inlet chamber, the second liquid outlet chamber and the return liquid chamber are arranged inside the second current collector, the second liquid inlet chamber and the second liquid outlet chamber are spaced apart and are respectively connected with the flow channel, and the return liquid chamber is connected with the second liquid outlet chamber and is spaced apart from the second liquid inlet chamber; the third current collector is arranged at the first end of the third liquid cooling plate, and the third liquid inlet chamber and the third liquid outlet chamber are arranged inside the third current collector, the third liquid inlet chamber and the third liquid outlet chamber are spaced apart and are respectively connected with the flow channel; wherein, the first liquid inlet chamber, the second liquid inlet chamber and the third liquid inlet chamber are connected, and the first liquid outlet chamber, the second liquid outlet chamber and the third liquid outlet chamber are connected.

[0010] Optionally, the first liquid cooling plate and the second liquid cooling plate are spaced apart along the second direction, and a plurality of the third liquid cooling plates are spaced apart along the second direction between the first liquid cooling plate and the second liquid cooling plate; the first liquid inlet cavity, the second liquid inlet cavity and the third liquid inlet cavity are connected along the second direction; the first liquid outlet cavity, the second liquid outlet cavity and the third liquid outlet cavity are connected along the second direction.

[0011] Optionally, the battery pack further comprises a bus assembly and a signal collection component; the bus assembly is arranged at one end of the battery cell in the third direction away from the bracket, the signal collection component is arranged on one side of the bus assembly away from the battery cell in the third direction, and a terminal is arranged at one end of the battery cell away from the bracket in the third direction; one end of the signal collection component in the first direction is bent toward the direction close to the battery cell to form a first bending portion; the bus assembly comprises: a bus, comprising a first connecting end and a second connecting end arranged opposite to each other along the first direction; a first output row, arranged at the second connecting end at the first A first output row is provided on a side of the bus bar away from the first output row in the first direction, and a first output terminal is provided on a side of the first output row adjacent to the second connection end along the first direction, and a second bending portion is bent toward the direction close to the battery cell on the side of the first output row away from the second connection end; a second output row is provided on a side of the bus bar away from the first output row in the first direction, and a second output terminal is provided on a side of the second output row adjacent to the first connection end along the first direction; a connecting sheet, the connecting sheet and the second bending portion are overlapped along the first direction; along the first direction, the first bending portion is provided on a side of the connecting sheet away from the second bending portion.

[0012] Optionally, the battery pack further includes at least one insulating layer, wherein the insulating layer is disposed between the bus bar and the battery cell, and an opening is formed on the insulating layer, and the terminal is exposed from the opening.

[0013] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0014] In summary, the embodiment of the present application provides a battery pack and an electric device having the battery pack, wherein the battery pack is provided with a first flow guide cavity inside a first side wall, a bracket is provided inside a receiving cavity of a box body, a second flow guide cavity is provided inside the bracket, a protrusion is provided on a side of the first side wall facing the battery cell, a third flow guide cavity is provided inside the protrusion, and the third flow guide cavity is connected with both the first flow guide cavity and the second flow guide cavity, so that the second flow guide cavity is connected with the first flow guide cavity through the third flow guide cavity. The battery cell and the bracket are stacked, and a first through hole connected with the second flow guide cavity is provided on a supporting surface of the bracket facing the battery cell, a first explosion-proof valve is provided at one end of the battery cell adjacent to the supporting surface, the first explosion-proof valve is arranged opposite to the first through hole, and a second explosion-proof valve is provided on the first side wall, when thermal runaway occurs in the battery cell, the generated thermal runaway gas is discharged through the first explosion-proof valve, the discharged thermal runaway gas enters the second flow guide cavity through the first through hole, then enters the first flow guide cavity through the third flow guide cavity, and is discharged to the outside of the box body through the second explosion-proof valve. Among them, the third guide cavity inside the protrusion can guide and accumulate the thermal runaway gas inside the bracket to the first guide cavity inside the first side wall, avoiding the accumulation of thermal runaway gas in the box body, thereby ensuring that the thermal runaway gas generated during thermal runaway of the battery cell can be discharged to the outside of the box body in a timely and smooth manner, thereby improving the safety of the battery cell and further ensuring the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 Exploded diagram of

[0018] Figure 3 is a partial structural schematic diagram of a battery pack provided in an embodiment of the present application;

[0019] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at point A;

[0020] Figure 5 It is a schematic diagram of the combined structure of the box and the bracket in the battery pack provided in the embodiment of the present application;

[0021] Figure 6 yes Figure 5 BB section view;

[0022] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at C;

[0023] Figure 8 It is a schematic diagram of the combined structure of the bottom plate, the bracket, the fireproof plate, the first buffer member and the second buffer member in the battery pack provided in the embodiment of the present application;

[0024] Fig. 9 is a schematic diagram of the structure of a bracket in a battery pack provided in an embodiment of the present application;

[0025] Fig.10 yes Fig. 9 A schematic diagram of the structure at D of FIG.

[0026] Fig.11 is a schematic structural diagram of a first angle of a first wall in a battery pack provided in an embodiment of the present application;

[0027] Fig.12 is a schematic structural diagram of a second angle of a first wall in a battery pack provided in an embodiment of the present application;

[0028] Fig.13 is a structural schematic diagram showing a first angle of the combined structure of a battery cell and a liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0029] Fig.14 is a structural schematic diagram of a second angle of the combined structure of a battery cell and a liquid cooling plate in a battery pack provided in an embodiment of the present application;

[0030] Fig.15 is a schematic structural diagram of a first angle of a first current collector in a battery pack provided in an embodiment of the present application;

[0031] Fig.16 is a schematic structural diagram of a first current collector in a battery pack provided in an embodiment of the present application at a second angle;

[0032] Fig.17 is a schematic structural diagram of a second current collector in a battery pack provided in an embodiment of the present application at a first angle;

[0033] Fig.18 is a schematic structural diagram of a second angle of a second current collector in a battery pack provided in an embodiment of the present application;

[0034] Fig.19 is a schematic structural diagram of a third current collector in a battery pack provided in an embodiment of the present application at a first angle;

[0035] Fig. 20 is a schematic structural diagram of a third current collector in a battery pack provided in an embodiment of the present application at a second angle;

[0036] Fig.21 It is a schematic diagram of the combined structure of a busbar group, a signal collection component and an insulating layer in a battery pack provided in an embodiment of the present application;

[0037] Fig. 22 It is a partial structural schematic diagram of a busbar group in a battery pack provided in an embodiment of the present application;

[0038] Fig.23 A schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application.

[0039] Description of main reference numerals:

[0040] 1. Battery pack;

[0041] 10. box body, 101. accommodating cavity, 11. first side wall, 110. first flow guide cavity, 1101. partition, 111. protrusion, 111a. first surface, 111b. second surface, 112. third flow guide cavity, 113. third through hole, 114. fourth through hole, 115. fifth through hole, 116. sixth through hole, 12. second side wall, 13. first wall, 131. first opening, 14. second wall, 15. shield;

[0042] 20. bracket, 201. second flow guiding cavity, 202. flow guiding channel, 21. supporting surface, 22. first through hole, 23. second through hole, 24. raised portion, 25. rib plate;

[0043] 30. Battery cell, 31. First explosion-proof valve, 32. Terminal, 321. Positive terminal, 322. Negative terminal;

[0044] 40. Second explosion-proof valve;

[0045] 50. fireproof board, 51. first buffer member, 52. second buffer member;

[0046] 60. Liquid cooling plate, 601. First end, 602. Second end, 61. First liquid cooling plate, 62. Second liquid cooling plate, 63. Third liquid cooling plate, 64. Blocking member;

[0047] 71, first current collector, 711, first liquid inlet cavity, 712, first liquid outlet cavity, 713, liquid supply cavity, 714, first side plate, 715, second side plate, 716, first partition plate, 717, first convex ring, 7171, first sealing plate, 7181, first liquid inlet joint, 7182, first liquid outlet joint, 7183, liquid supply joint;

[0048] 72, second current collector, 721, second liquid inlet chamber, 722, second liquid outlet chamber, 723, liquid return chamber, 724, third side plate, 725, fourth side plate, 726, second partition plate, 727, second convex ring, 7271, second sealing plate, 7281, second liquid inlet joint, 7282, second liquid outlet joint, 7283, liquid return joint;

[0049] 73. a third current collector, 731. a third liquid inlet cavity, 732. a third liquid outlet cavity, 733. a fifth side plate, 734. a sixth side plate, 735. a third partition plate, 736. a third liquid inlet connector, 737. a third liquid outlet connector;

[0050] 74, liquid inlet pipe, 75, liquid outlet pipe, 76, liquid supply pipe, 761, liquid supply plug, 77, liquid return pipe, 771, liquid return plug;

[0051] 80. busbar assembly, 81. signal collection member, 811. first bending portion, 82. busbar, 821. first connection end, 822. second connection end, 823. connecting arm, 83. first output row, 831. first output end, 832. second bending portion, 84. second output row, 841. second output end, 85. connecting piece, 86. insulating layer, 860. opening, 861. first insulating layer, 862. second insulating layer, 87. connector, 871. mounting plate, 872. socket;

[0052] 90, cover plate, 91, base plate, 92, BMS module, 93, BDU module;

[0053] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0054] 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.

[0055] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0056] 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.

[0057] 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.

[0058] 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%.

[0059] This embodiment provides an electric device, including a battery pack 1, and the battery pack 1 serves as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0060] In some embodiments of the present application, a battery pack 1 is provided, referring to Figures 1 to 13 as well as Fig.23 The battery pack 1 includes: a box body 10, a bracket 20, a battery cell 30, a second explosion-proof valve 40 and a protrusion 111. The battery pack 1 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 to Figure 7 In the illustrated embodiment, the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0061] Reference Figure 2 The box body 10 is provided with a receiving cavity 101, referring to Figure 1 , Figure 3 as well as Figure 5-6 The box body 10 includes a first side wall 11 and a second side wall 12 arranged opposite to each other along a first direction X, referring to Figure 4 , Figure 6-7 as well as Figure 11-12 , a first guide cavity 110 is provided inside the first side wall 11, and the first guide cavity 110 extends along the second direction Y. Figure 1 to Figure 7 In the illustrated embodiment, the first direction X is parallel to the length direction of the box body 10 , the second direction Y is parallel to the width direction of the box body 10 , and the third direction Z is parallel to the height direction of the box body 10 .

[0062] Reference Figure 2 to Figure 10 The bracket 20 is disposed in the accommodating cavity 101 of the box body 10. Figure 3 to Figure 7 In the embodiment shown, the bracket 20 is arranged at the bottom of the inner side of the box body 10, referring to Figure 6 , Figure 7 and Fig.10 A second flow guiding cavity 201 is provided inside the bracket 20 .

[0063] Reference Figure 2 and Figure 3 The battery cell 30 is disposed in the receiving cavity 101 of the box body 10, referring to Figure 3-4 The battery cell 30 and the bracket 20 are stacked along the third direction Z. Along the third direction Z, the bracket 20 has a supporting surface 21 facing the battery cell 30. Figure 5 , Figure 7 to Figure 10The support surface 21 is provided with a first through hole 22 communicating with the second flow guiding cavity 201. In other words, the support surface 21 is provided with a first through hole 22 penetrating the support surface 21 along the third direction Z. Fig.23 The battery cell 30 is provided with a first explosion-proof valve 31 at one end adjacent to the support surface 21 in the third direction Z, and the first explosion-proof valve 31 is arranged opposite to the first through hole 22 along the third direction Z. Figure 2 to Figure 4 , Fig.13 as well as Fig.23 In the embodiment shown, the battery cell 30 is a cylindrical battery. In other implementations, the battery cell 30 may be a square battery or a battery cell of other shapes. The present application does not limit the shape and quantity of the battery cell 30. It is only required that when the battery cell 30 is assembled inside the accommodating cavity 101, the first explosion-proof valve 31 is arranged at one end of the battery cell 30 adjacent to the supporting surface 21 in the third direction Z, and the first explosion-proof valve 31 and the first through hole 22 are arranged opposite to each other along the third direction Z. Fig.23 , the height direction of the battery cell 30 is parallel to the third direction Z, that is, the battery cell 30 is arranged in the accommodation cavity 101 along the third direction Z.

[0064] Reference Figure 1 and Figure 7 The second explosion-proof valve 40 is inserted on the first side wall 11 of the box body 10 , the air inlet end of the second explosion-proof valve 40 is connected to the first guide cavity 110 , and the exhaust end of the second explosion-proof valve 40 is located outside the box body 10 .

[0065] Reference Figures 4 to 7 as well as Figure 11-12 The protrusion 111 is protruding along the first direction X and is disposed on a side of the first side wall 11 facing the battery cell 30. A third flow guiding cavity 112 is disposed inside the protrusion 111. The third flow guiding cavity 112 is connected to both the first flow guiding cavity 110 and the second flow guiding cavity 201. Figure 7 In the illustrated embodiment, the second flow guiding cavity 201 is connected to the first flow guiding cavity 110 through the third flow guiding cavity 112 .

[0066] In existing battery packs, the explosion-proof valve of a single cell is usually arranged at the top of the single cell in its height direction, that is, at one end of the single cell adjacent to the battery pack cover. However, the space area between the single cell and the cover usually needs to be arranged with a CCS component to realize the collection of data such as temperature and current of the single cell. When thermal runaway occurs in the single cell, the thermal runaway gas is discharged through the explosion-proof valve. However, the presence of the CCS component will block and interfere with the discharge of the thermal runaway gas, resulting in difficulty in timely and smooth discharge of the thermal runaway gas from the outside of the battery pack, affecting the safety of the single cell, and then affecting the safety of the battery pack.

[0067] The battery pack 1 provided in the embodiment of the present application is provided with a first guide cavity 110 inside the first side wall 11 of the box body 10, a bracket 20 is provided inside the accommodating cavity 101 of the box body 10, a second guide cavity 201 is provided inside the bracket 20, and a protrusion 111 is provided on a side of the first side wall 11 facing the battery cell 30 in the first direction X, and a third guide cavity 112 is provided inside the protrusion 111, and the third guide cavity 112 is connected with both the first guide cavity 110 and the second guide cavity 201, so that the second guide cavity 201 in the bracket 20 is connected with the first guide cavity 110 inside the first side wall 11 through the third guide cavity 112. The battery cell 30 is arranged on the supporting surface 21 of the bracket 20, so that the battery cell 30 and the bracket 20 are overlapped along the third direction Z, and the first explosion-proof valve 31 is arranged at one end of the battery cell 30 adjacent to the supporting surface 21 in the third direction Z, the first explosion-proof valve 31 and the first through hole 22 are arranged opposite to each other in the third direction Z, and the second explosion-proof valve 40 is arranged on the first side wall 11, and the air inlet end of the second explosion-proof valve 40 is connected with the first guide cavity 110, so as to form an exhaust pressure relief channel in which the second guide cavity 201, the third guide cavity 112, the first guide cavity 110 and the second explosion-proof valve 40 are connected in sequence, and the first explosion-proof valve 31 on the battery cell 30 is arranged at one end of the battery cell 30 away from the CCS assembly in the third direction Z. When the battery cell 30 has thermal runaway, the generated thermal runaway gas is discharged through the first explosion-proof valve 31, and the discharged first explosion-proof valve 31 enters the second guide cavity 201 through the first through hole 22 on the bracket 20, and enters the second guide cavity 201. The thermal runaway gas further enters the first guide cavity 110 in the first side wall 11 through the third guide cavity 112 in the protrusion 111, and is discharged to the outside of the box body 10 through the second explosion-proof valve 40, so that the thermal runaway gas generated by the battery cell 30 due to thermal runaway can be discharged to the outside of the battery pack 1 through the bracket 20 arranged at the bottom of the inner side of the accommodating cavity 101, and the thermal runaway gas does not need to be discharged through the end of the battery cell 30 adjacent to the CCS component in the third direction Z, and the discharged thermal runaway gas will not be blocked or interfered by the CCS component. The third guide cavity 112 inside the protrusion 111 can guide and accumulate the thermal runaway gas inside the bracket 20 to be discharged to the first guide cavity 110 in the first side wall 11, thereby avoiding leakage of the thermal runaway gas inside the box body 10, so that the thermal runaway gas can be discharged to the outside of the battery pack 1 in a timely and smooth manner, thereby ensuring the safety of the battery cell, and then ensuring the safety of the battery pack 1, and ensuring the safety of the electrical equipment.

[0068] In some embodiments, reference Figure 4 , Figure 6-7In the first direction X, one end of the bracket 20 adjacent to the protruding portion 111 overlaps with the protruding portion 111 along the third direction Z, and the second guide cavity 201 is connected to the third guide cavity 112. Specifically, the bracket 20 is arranged in the accommodating cavity 101 along the first direction X, and one end of the bracket 20 adjacent to the first side wall 11 in the first direction X overlaps with the protruding portion 111 along the third direction Z. Specifically, Figure 4 , Figure 6 and Figure 7 In the illustrated embodiment, along the third direction Z, the protrusion 111 is on the top and the bracket 20 is on the bottom. The structural design of the bracket 20 and the protrusion 111 overlapping along the third direction Z allows the thermal runaway gas to directly enter the third guide cavity 112, thereby preventing the thermal runaway gas from leaking into the accommodating cavity 101, ensuring the safe use of other battery cells 30 and components, and making full use of the internal space of the accommodating cavity 101.

[0069] In some embodiments, reference Figure 4 , Figure 7 as well as Fig.11 and Fig.12 The protruding portion 111 includes a first surface 111a and a second surface 111b disposed opposite to each other along the third direction Z. The first surface 111a overlaps the supporting surface 21 of the bracket 20 along the third direction Z. Figure 7 as well as Figure 9-10 The support surface 21 of the bracket 20 is provided with a second through hole 23 at one end adjacent to the protruding portion 111 in the first direction X. Figure 7 and Fig.12 A third through hole 113 is provided on the first surface 111a of the protruding portion 111, and the third through hole 113 penetrates the first surface 111a along the third direction Z and is connected with the third guide cavity 112. The second through hole 23 on the bracket 20 and the third through hole 113 on the protruding portion 111 are arranged opposite to each other along the third direction Z and are connected with each other to connect the second guide cavity 201 with the third guide cavity 112. The structural design in which the second through hole 23 and the third through hole 113 are connected along the third direction Z can make the second guide cavity 201 connected with the third guide cavity 112, so as to facilitate the thermal runaway gas to enter the third guide cavity 112 through the second guide cavity 201, thereby ensuring the smoothness of the thermal runaway gas discharge.

[0070] In some embodiments, reference Figure 7 as well as Figure 9-10 The second through hole 23 extends along the second direction Y to form a strip-shaped hole structure, referring to Fig.12, the third through hole 113 extends along the second direction Y to form a strip-shaped hole structure to ensure that the thermal runaway gas is smoothly discharged into the third guide cavity 112. In some embodiments, the second through hole 23 corresponds to the third through hole 113 in number. In other implementations, the second through hole 23 and the third through hole 113 may correspond to the other in number in other ways, for example, one second through hole 23 corresponds to two or more third through holes 113, or one third through hole 113 corresponds to two or more second through holes 23. In some embodiments, the second through hole 23 and the third through hole 113 may adopt other shapes, as long as the second through hole 23 and the third through hole 113 are connected along the third direction Z. This application does not limit the number and shape of the second through holes 23 and the number and shape of the third through holes 113.

[0071] In some embodiments, reference Figure 4 as well as Figure 9-10 The support surface 21 of the bracket 20 is provided with a protruding portion 24 protruding from one end of the protruding portion 111 in the first direction X. Specifically, the protruding portion 24 is provided on the support surface 21 protruding along the third direction Z. Fig.12 A fourth through hole 114 is formed on the first surface 111a of the protruding portion 111. Specifically, the fourth through hole 114 penetrates the first surface 111a along the third direction Z and communicates with the third guide cavity 112. Fig. 9 and Fig.10 , the second through hole 23 and the protrusion 24 are arranged at intervals along the second direction Y. The bracket 20 and the protrusion 111 are overlapped along the third direction Z, and the protrusion 24 is inserted into the fourth through hole 114, so as to fix the bracket 20 and the protrusion 111, ensure the assembly stability between the bracket 20 and the protrusion 111, avoid the dislocation between the second through hole 23 and the third through hole 113 when the battery pack 1 shakes or is impacted, and affect the discharge of thermal runaway gas, thereby ensuring the smooth discharge of thermal runaway gas.

[0072] In some embodiments, reference Fig. 9 and Fig.10 The bracket 20 includes at least one rib plate 25, which is disposed in the second flow guiding cavity 201. The rib plate 25 extends along the first direction X to divide the second flow guiding cavity 201 into two flow guiding channels 202 spaced apart along the second direction Y. The two flow guiding channels 202 are connected to both the first flow guiding cavity 110 and the third flow guiding cavity 112. Figure 2 , Figure 3 and Fig.13There are multiple battery cells 30 in the battery pack 1, and multiple battery cells 30 are arranged along the first direction X to form a battery column, and multiple battery columns are arranged along the second direction Y to form a battery group. One guide channel 202 corresponds to one battery column, so that the thermal runaway gas discharged by the battery cells 30 in the same column during thermal runaway can be discharged into the same guide channel 202, and then uniformly discharged to the first guide cavity 110 through the third guide cavity 112 and discharged to the outside of the battery pack 1 through the second explosion-proof valve 40, thereby ensuring the smoothness of the thermal runaway gas discharge. In addition, due to the setting of the rib plate 25, the discharged thermal runaway gas will not affect the battery cells 30 in the remaining columns, thereby preventing the battery cells 30 in the remaining columns that have not experienced thermal runaway from being affected by the discharged thermal runaway gas and causing thermal runaway, thereby reducing the spread speed of the thermal runaway.

[0073] In some embodiments, reference Figure 7 and Fig.11 A fifth through hole 115 is provided on the second surface 111b of the protruding portion 111. Figure 7 , Fig.11 and Fig.12 The first side wall 11 is provided with a sixth through hole 116 on a side facing the battery cell 30 in the first direction X. Specifically, the first side wall 11 is provided with a sixth through hole 116 on a side of the protrusion 111 in the first direction X. The fifth through hole 115 is communicated with the sixth through hole 116 to connect the third guide cavity 112 in the protrusion 111 with the first guide cavity 110 in the first side wall 11. The air inlet end of the second explosion-proof valve 40 is arranged opposite to the sixth through hole 116 along the first direction X. Specifically, Figure 7 In the illustrated embodiment, the air inlet end of the second explosion-proof valve 40 is inserted into the sixth through hole 116, so that the thermal runaway gas entering the third guide cavity 112 can smoothly enter the first guide cavity 110 and be discharged to the outside of the battery pack 1 through the second explosion-proof valve 40, thereby ensuring the smoothness of the discharge.

[0074] In some embodiments, reference Figure 3 , Figure 5-6 A baffle 15 is provided on one side of the first side wall 11 facing the battery cell 30 in the first direction X, and the baffle 15 covers the connection between the fifth through hole 115 and the sixth through hole 116 to form a cover for the fifth through hole 115 and the sixth through hole 116, so as to prevent the thermal runaway gas from leaking at the connection between the fifth through hole 115 and the sixth through hole 116, so that the thermal runaway gas can only be discharged to the outside of the battery pack 1 through the second explosion-proof valve 40, so as to prevent the thermal runaway gas from affecting other components inside the accommodating cavity 101.

[0075] In some embodiments, reference Figure 2 and Figure 8The battery pack 1 also includes a fireproof plate 50, which is arranged between the battery cell 30 and the bracket 20. The fireproof plate 50 is constructed to be able to be broken through by the thermal runaway gas generated by the battery cell under a preset pressure, so that the thermal runaway gas enters the second guide cavity 201 through the first through hole 22. Specifically, the fireproof plate can be a mica plate or a mica sheet laminated with multiple layers of mica paper. When the battery cell 30 has thermal runaway, the generated thermal runaway airflow can break through the fireproof plate 50 and enter the second guide cavity 201. The setting of the fireproof plate 50 can form a barrier between the second guide cavity 201 and the battery cell 30 that has not experienced thermal runaway, that is, the fireproof plate 50 corresponding to the battery cell 30 that has not experienced thermal runaway is not broken, so as to avoid the thermal runaway gas entering the second guide cavity 201 from having a thermal runaway effect on the battery cell 30 that has not experienced thermal runaway, thereby avoiding the spread of thermal runaway and ensuring the safety of the battery pack 1.

[0076] In some embodiments, reference Figure 8 The battery pack 1 further includes a first buffer 51, which is disposed on a side of the fireproof plate 50 away from the bracket 20 in the third direction Z, and the first buffer 51 corresponds to the region where the first through hole 22 is provided on the support surface 21 of the bracket 20, and the first buffer 51 is provided with an exhaust hole (not shown in the figure) penetrating the first buffer 51 along the third direction Z, and the exhaust hole is arranged opposite to the first through hole 22 on the bracket 20 along the third direction Z. The first buffer 51 is a buffer foam, and the first buffer 51 can form a seal for the assembly gap between the bracket 20 and the battery cell 30 to prevent the thermal runaway gas generated by the battery cell 30 from leaking from the assembly gap.

[0077] In some embodiments, reference Figure 8 The battery pack 1 further includes a second buffer 52, which is disposed at the position where the second through hole 23 is opened on the support surface 21 of the bracket 20. The second buffer 52 is annular in shape and surrounds the second through hole 23 along the circumferential direction of the second through hole 23. The second buffer 52 is a buffer foam, which can form a seal for the assembly gap between the bracket 20 and the protrusion 111 to prevent the thermal runaway gas in the second guide cavity 201 from leaking at the connection between the second through hole 23 and the third through hole 113.

[0078] In some embodiments, reference Figure 13-14 The battery pack 1 further includes a plurality of liquid cooling plates 60, the liquid cooling plates 60 extending along the first direction X, and the plurality of liquid cooling plates 60 are arranged in the receiving cavity 101 of the box body 10 at intervals along the second direction Y, referring to Figure 13-14 The liquid cooling plate 60 includes a first end 601 and a second end 602 that are arranged opposite to each other along the first direction X. A flow channel (not shown in the figure) for the flow of a heat transfer medium is provided inside the liquid cooling plate 60. Fig.14The plurality of liquid cooling plates 60 include a first liquid cooling plate 61, a second liquid cooling plate 62, and a plurality of third liquid cooling plates 63. The first liquid cooling plate 61 and the second liquid cooling plate 62 are arranged at intervals along the second direction Y. The plurality of liquid cooling plates 63 are arranged between the first liquid cooling plate 61 and the second liquid cooling plate 62 at intervals along the second direction Y. At least one battery cell 30 is arranged between two adjacent liquid cooling plates 60 along the second direction Y. Fig.13 In the illustrated embodiment, a liquid cooling plate 60 is disposed between two adjacent battery cells 30 in the second direction Y. In other words, a liquid cooling plate 60 is disposed between two adjacent battery columns along the second direction Y. The battery cells 30 abut against the liquid cooling plate 60 along the second direction Y.

[0079] Among them, the flow channel inside the liquid cooling plate 60 passes through the liquid cooling plate 60 along the first direction X (i.e., the length direction of the liquid cooling plate 60), and the flow channel includes a liquid inlet flow channel and a liquid outlet flow channel, the liquid inlet flow channel and the liquid outlet flow channel are arranged at intervals along the third direction Z, and the liquid inlet flow channel and the liquid outlet flow channel are connected to each other at one end adjacent to the second end 602 in the first direction X, so that the flow of the heat-conducting medium in the flow channel is realized, and heat exchange is carried out between the liquid cooling plate 60 and the battery cell 30 through contact with the battery cell 30, so that the battery cell 30 is in a suitable operating temperature range, thereby ensuring the service life and safety of the battery cell 30.

[0080] In some embodiments, reference Fig.13 and Fig.14 The liquid cooling plate 60 further includes a blocking member 64 , which is disposed at a second end 602 of the liquid cooling plate 60 in the first direction X to block the flow channel inside the liquid cooling plate 60 .

[0081] In some embodiments, reference Fig.13 and Fig.14 The liquid cooling plate 60 is provided with a plurality of arcuate surfaces, which abut against the side surfaces of the cylindrical battery cells 30, thereby increasing the contact area between the battery cells 30 and the liquid cooling plate 60, and further improving the heat transfer efficiency between the liquid cooling plate 60 and the battery cells 30 when the temperature of the battery cells 30 is too high, thereby reducing the risk of thermal runaway of the battery cells 30.

[0082] In some embodiments, a plurality of reinforcing ribs (not shown in the figure) are provided inside the liquid cooling plate 60, which not only enhance the overall structural strength of the liquid cooling plate 60, but also divide the flow channel into multiple sub-flow channels, thereby increasing the flow speed of the heat transfer medium in the flow channel and ensuring the heat transfer efficiency between the liquid cooling plate 60 and the battery cell 30.

[0083] In some embodiments, the liquid cooling plate 60 is made of aluminum alloy, which has good strength and rigidity, and an insulating layer is sprayed on the surface to prevent short circuits between battery cells 30. In other implementations, the liquid cooling plate 60 can also be made of non-metallic materials, such as plastic materials such as PA12, PP0, PPS, etc., which have good strength and rigidity. The plastic material itself has good insulation properties and does not require an additional insulating layer to be sprayed, thereby reducing the cost of the liquid cooling plate 60.

[0084] In some embodiments, reference Fig.13 , multiple battery cells 30 are staggered and arranged with a certain gap along the first direction X to form a battery column. Along the second direction Y, the battery cells 30 in two adjacent battery columns are staggered, which is beneficial to improve the space utilization of the battery pack 1.

[0085] In some embodiments, reference Figures 14 to 20 The battery pack 1 further includes a first current collector 71 , a second current collector 72 , a third current collector 73 , a liquid inlet pipe 74 , a liquid outlet pipe 75 , a liquid supply pipe 76 , a liquid supply plug 761 , a liquid return pipe 77 and a liquid return plug 771 .

[0086] Reference Fig.14 The first current collector 71 is disposed at the first end 601 of the first liquid cooling plate 61, referring to Fig.15 and Fig.16 The first current collector 71 is provided with a first liquid inlet cavity 711, a first liquid outlet cavity 712 and a liquid supply cavity 713, referring to Fig.16 The first liquid inlet cavity 711 and the first liquid outlet cavity 712 are spaced apart along the third direction Z and are respectively connected to the flow channels in the first liquid cooling plate 61. Specifically, the first liquid inlet cavity 711 is connected to the liquid inlet flow channel in the flow channel in the first liquid cooling plate 61, and the first liquid outlet cavity 712 is connected to the liquid outlet flow channel in the flow channel in the first liquid cooling plate 61. The liquid supply cavity 713 is connected to the first liquid inlet cavity 711 and spaced apart from the first liquid outlet cavity 712, that is, the liquid supply cavity 713 is not connected to the first liquid outlet cavity 712.

[0087] Reference Fig.15 and Fig.16The first current collector 71 further includes a first side plate 714, a second side plate 715, a first partition plate 716, a first convex ring 717, a first liquid inlet joint 7181, a first liquid outlet joint 7182 and a liquid supply joint 7183. The first side plate 714 and the second side plate 715 are arranged at intervals along the second direction Y and define a first accommodating cavity (not shown in the figure). The first partition plate 716 is arranged in the first accommodating cavity and divides the first accommodating cavity into a first liquid inlet cavity 711 and a first liquid outlet cavity 712. The first side plate 714 faces the second liquid cooling plate 62 in the second direction Y. The first convex ring 717 is protrudingly arranged on the second side plate 715. The liquid supply cavity 713 is defined between the first convex ring 717 and the second side plate 715. The first liquid inlet joint 7181 is inserted into the first side plate 714 and It is connected with the first liquid inlet chamber 711. Specifically, one end of the first liquid inlet joint 7181 extending into the inner side of the first accommodating chamber is provided with a first connecting hole connected with the first liquid inlet chamber 711. The first liquid outlet joint 7182 is inserted into the first side plate 714 and is connected with the first liquid outlet chamber 713. Specifically, one end of the first liquid outlet joint 7182 extending into the inner side of the first accommodating chamber is provided with a second connecting hole connected with the first liquid outlet chamber 712. The liquid supply joint 7183 passes through the first current collector 71 and extends into the liquid supply chamber 713 to be connected with both the first liquid inlet chamber 711 and the liquid supply chamber 713. Specifically, one end of the liquid supply joint 7183 extending into the inner side of the first accommodating chamber is provided with a third connecting hole to be connected with the first liquid inlet chamber 711, thereby forming a three-hole current collector structure of the first current collector 71.

[0088] Reference Fig.14 The second current collector 72 is disposed at the first end 601 of the second liquid cooling plate 62, referring to Fig.17 and Fig.18 The second current collector 72 is provided with a second liquid inlet cavity 721, a second liquid outlet cavity 722 and a liquid return cavity 723, referring to Fig.17 The second liquid inlet chamber 721 and the second liquid outlet chamber 722 are spaced apart along the third direction Z and are respectively connected to the flow channel in the second liquid cooling plate 62. Specifically, the second liquid inlet chamber 721 is connected to the liquid inlet flow channel in the flow channel in the second liquid cooling plate 62, and the second liquid outlet chamber 722 is connected to the liquid outlet flow channel in the flow channel in the second liquid cooling plate 62. The return liquid chamber 723 is connected to the second liquid outlet chamber 722 and is spaced apart from the second liquid inlet chamber 721, that is, the return liquid chamber 723 is not connected to the second liquid inlet chamber 721. In the first current collector 71, the first liquid inlet chamber 711 is connected to the liquid supply chamber 713 and is spaced apart from the first liquid outlet chamber 712, thereby avoiding mixed flow between the inlet and outlet liquids to affect the heat exchange efficiency between the liquid cooling plate 60 and the battery cell 30.

[0089] Reference Fig.17 and Fig.18The second current collector 72 further includes a third side plate 724, a fourth side plate 725, a second partition plate 726, a second convex ring 727, a second liquid inlet joint 7281, a second liquid outlet joint 7282 and a liquid return joint 7283. The third side plate 724 and the fourth side plate 725 are spaced apart along the second direction Y and define a second accommodating chamber (not shown in the figure). The second partition plate 726 is disposed in the second accommodating chamber and separates the second accommodating chamber into a second liquid inlet chamber 721 and a second liquid outlet chamber 722. The fourth side plate 725 faces the first liquid cooling plate 61 in the second direction Y. The second convex ring 727 is protrudingly disposed on the third side plate 724. A liquid return chamber 723 is defined between the second convex ring 727 and the third side plate 724. The second liquid inlet joint 7281 is inserted into the fourth side plate 725 and communicates with the second liquid inlet chamber 721. Specifically, the second liquid inlet joint 7281 extends into one end of the inner side of the second accommodating chamber. A fourth connecting hole communicating with the second liquid inlet chamber 721 is provided, and a second liquid outlet joint 7282 is inserted into the fourth side plate 725 and communicated with the second liquid outlet chamber 722. Specifically, a fifth connecting hole communicating with the second liquid outlet chamber 722 is provided at one end of the second liquid outlet joint 7282 extending into the inner side of the second accommodating chamber, and a liquid return joint 7283 passes through the second current collector 72 and extends into the liquid return chamber 723, so as to communicate with both the second liquid outlet chamber 722 and the liquid return chamber 723. Specifically, a sixth connecting hole is provided at one end of the liquid return joint 7283 extending into the inner side of the second accommodating chamber, so as to communicate with the second liquid outlet chamber 722, thereby forming a three-hole current collector structure of the second current collector 72. In the second current collector 72, the second liquid outlet chamber 722 is communicated with the liquid return chamber 723, and is spaced from the second liquid inlet chamber 721, so as to avoid mixed flow between the inlet and outlet, which affects the heat exchange efficiency between the liquid cooling plate 60 and the battery cell 30.

[0090] Reference Fig.14 The third current collector 73 is disposed at the first end 601 of the third liquid cooling plate 63, referring to Fig.19 and Fig. 20 A third liquid inlet cavity 731 and a third liquid outlet cavity 732 are provided inside the third current collector 73. The third liquid inlet cavity 731 and the third liquid outlet cavity 732 are arranged at intervals along the third direction Z and are respectively connected to the flow channel in the third liquid cooling plate 63. Specifically, the third liquid inlet cavity 731 is connected to the liquid inlet flow channel in the flow channel in the third liquid cooling plate 63, and the third liquid outlet cavity 732 is connected to the liquid outlet flow channel in the flow channel in the third liquid cooling plate 63.

[0091] Reference Fig.19 and Fig. 20The third current collector 73 further includes a fifth side plate 733, a sixth side plate 734, a third partition plate 735, a third liquid inlet joint 736 and a third liquid outlet joint 737. The fifth side plate 733 and the sixth side plate 734 are arranged at intervals along the second direction Y and define a third accommodating cavity (not shown in the figure). The third partition plate 735 is arranged in the third accommodating cavity and separates the third accommodating cavity into a third liquid inlet cavity 731 and a third liquid outlet cavity 732. The third liquid inlet joint 736 passes through the third current collector 73 along the second direction Y and is connected to the third liquid inlet cavity 731. Specifically, the third liquid inlet joint 736 is located at the third A seventh connecting hole communicating with the third liquid inlet chamber 731 is provided at the inner end of the accommodating chamber, and the third liquid outlet joint 737 penetrates the third current collector 73 along the second direction Y and communicates with the third liquid outlet chamber 732. Specifically, the third liquid outlet joint 737 is located at the inner end of the third accommodating chamber and is provided with an eighth connecting hole communicating with the third liquid outlet chamber 732, thereby forming a double-hole current collector structure of the third current collector 73. In the third current collector 73, the third liquid inlet chamber 731 and the third liquid outlet chamber 732 are arranged at intervals, thereby avoiding mixed flow between the liquid inlet and the liquid outlet, which affects the heat exchange efficiency between the liquid cooling plate 60 and the battery cell 30.

[0092] Reference Figure 1 The liquid supply plug 761 and the liquid return plug 771 are respectively inserted into the first side wall 11 of the box body 10, referring to Fig.14 The liquid supply plug 761 is connected to the liquid supply joint 7183 on the first current collector 71 through the liquid supply pipe 76, and the liquid return plug 771 is connected to the liquid return joint 7283 on the second current collector 72 through the liquid return pipe 77. The first liquid inlet joint 7181 on the first current collector 71, the third liquid inlet joint 736 on the third current collector 73, and the second liquid inlet joint 7281 on the second current collector 72 are connected along the second direction Y through the liquid inlet pipe 74, so that the first liquid inlet cavity 711, the third liquid inlet cavity 731, and the second liquid inlet cavity 721 are connected along the second direction Y. The first liquid outlet joint 7182 on the first current collector 71, the third liquid outlet joint 737 on the third current collector 73, and the second liquid outlet joint 7282 on the second current collector 72 are connected along the second direction Y through the liquid outlet pipe 75, so that the first liquid outlet cavity 712, the third liquid outlet cavity 732, and the second liquid outlet cavity 722 are connected along the second direction Y. As a result, the liquid cooling supply and return systems in the battery pack 1 are both arranged at the same end of the liquid cooling plate 60 in the first direction X, thereby improving the space utilization of the internal accommodating cavity 101 of the box body 10 .

[0093] Among them, the connection between the liquid supply pipe 76 and the liquid supply plug 761 and the liquid supply joint 7183 is a quick-insert structure, the connection between the liquid return pipe 77 and the liquid supply joint 7183, the liquid return plug 771 and the liquid return joint 7283 is a quick-insert structure, the connection between the liquid inlet pipe 74 and the first liquid inlet joint 7181, the third liquid inlet joint 736 and the second liquid inlet joint 7281 is a quick-insert structure, and the connection between the liquid outlet pipe 75 and the first liquid outlet joint 7182, the third liquid outlet joint 737 and the second liquid outlet joint 7282 is a quick-insert structure. The quick-insert structure can be a snap connection, a threaded connection, etc., to improve assembly efficiency and facilitate subsequent centralized maintenance. The liquid inlet pipe 74, the liquid outlet pipe 75, the liquid supply pipe 76 and the liquid return pipe 77 can be water inlet pipes or non-metallic pipes, and this application does not limit this.

[0094] In some embodiments, reference Figures 4 to 7 as well as Fig.12 The second surface 111b of the protruding portion 111 is in the shape of a slope, referring to Figure 4 as well as Figures 14 to 20 The first convex ring 717 in the first current collector 71 and the second convex ring 727 in the second current collector 72 are both inclined to match the second surface 111b of the protrusion 111, thereby improving the space utilization in the third direction Z while ensuring smooth discharge of thermal runaway gas.

[0095] In some embodiments, referring to 2~ Figure 3 as well as Figure 21-22 The battery pack 1 further includes a bus assembly 80 and a signal collection component 81. The bus assembly 80 and the signal collection component 81 constitute a CCS assembly.

[0096] Refer to 2~ Figure 3 The busbar assembly 80 is disposed at one end of the battery cell 30 away from the bracket 20 in the third direction Z, referring to Fig.21 The signal collecting member 81 is disposed on a side of the busbar assembly 80 that is away from the battery cell 30 in the third direction Z. Fig.23 The battery cell 30 is provided with a terminal 32 at one end away from the bracket 20 in the third direction Z. The terminal 32 includes a positive terminal 321 and a negative terminal 322. The negative terminal 322 surrounds the positive terminal 321 along the circumferential direction of the positive terminal 321. Fig.21 One end of the signal collecting member 81 in the first direction X is bent toward the direction close to the battery cell 30 to form a first bent portion 811 .

[0097] In some embodiments, the signal acquisition component 81 is a flexible printed circuit (FPC) for collecting voltage and temperature data of the bus assembly 80 .

[0098] Reference Fig.21 and Fig. 22The busbar assembly 80 includes a busbar 82 , a first output bar 83 , a second output bar 84 and a connecting piece 85 .

[0099] The busbar 82 is used to electrically connect to the battery cell 30. Fig. 22 The busbar 82 includes a first connection end 821 and a second connection end 822 which are arranged opposite to each other along the first direction X. The first connection end 821 is used to be electrically connected to the positive terminal 321 of the battery cell 30, and the second connection end 822 is used to be electrically connected to the negative terminal 322 of the battery cell 30. Specifically, the first connection end 821 is welded to the positive terminal 321, and the second connection end 822 is welded to the negative terminal 322, so as to realize circuit conduction with the battery cell 30.

[0100] Reference Fig. 22 The first output row 83 is arranged on a side of the second connection end 822 away from the first connection end 821 in the first direction X. Along the first direction X, the first output row 83 is provided with a first output end 831 at one end adjacent to the second connection end 822. The first output end 831 is used to be electrically connected to the positive terminal 321 of the adjacent battery cell 30. The first output row 83 is bent on a side away from the second connection end 822 in the first direction X toward the direction close to the battery cell 30 to form a second bent portion 832.

[0101] Reference Fig. 22 The second output row 84 is arranged on a side of the bus 82 away from the first output row 83 in the first direction X. Along the first direction X, a second output terminal 841 is arranged at one end of the second output row 84 adjacent to the bus 82. The second output terminal 841 is used to be electrically connected to the negative terminal 322 of the adjacent battery cell 30.

[0102] Among them, the signal acquisition component 81 is provided with a window at one end corresponding to the terminal 32 of the battery cell 30 in the third direction Z, and a plurality of direct welding areas are provided on the signal acquisition component 81. The signal acquisition component 81 in the direct welding area is in direct contact with the bus 82, and is respectively connected to the bus 82, the first output row 83, and the second output row 84 by ultrasonic welding, so as to realize the voltage collection of the bus 82, the first output row 83, and the second output row 84, that is, the voltage collection and monitoring of the battery cell 30. In addition, at least one temperature collection branch is provided on the signal acquisition component 81, and at least one temperature sensor is arranged on the temperature collection branch. The temperature collection branch is connected to the battery cell 30 below by means of thermal conductive structural glue, thermal conductive structural pad, etc., so as to realize the temperature collection and monitoring of the battery cell 30. Among them, the bus 82, the first output row 83, and the second output row 84 are all aluminum rows.

[0103] Reference Fig. 22The connecting piece 85 and the second bending portion 832 are stacked along the first direction X. Specifically, the connecting piece 85 and the second bending portion 832 are stacked on one side of the battery cell 30 in the first direction X. Fig.21 , along the first direction X, the first bend 811 of the signal acquisition component 81 is overlapped with the second bend 832 of the first output row 83 on the side facing away from the connecting piece 85. Adjacent ends of two adjacent connecting pieces 85 along the second direction Y are connected to each other. Among them, the structural setting of the overlapping connecting piece 85 and the second bend 832 can increase the structural strength and current carrying capacity of the first output row 83, thereby improving the safety of the battery pack 1. The bending structure design of the second bend 832 improves the space utilization of the CCS assembly and the battery pack 1.

[0104] Reference Fig. 22 The battery pack 1 also includes a connector 87, which includes a mounting plate 871 and a socket 872. The mounting plate 871 is arranged on a side of the first bending portion 811 that is away from the second bending portion 832 in the first direction X, and the socket 872 is arranged on a side of the mounting plate 871 that is away from the first bending portion 811 in the first direction X. The structural design of the first bending portion 811 can improve the space utilization rate of the CCS component in the third direction Z. The signal acquisition component 81 is connected to an external temperature collector through the socket 872 of the connector 87 and the external wiring harness end connector.

[0105] In some embodiments, reference Fig.21 The battery pack 1 further includes an insulating layer 86, and an opening 860 is formed on the insulating layer 86 and penetrates the insulating layer 86 along the third direction Z. Fig.21 In the illustrated embodiment, the insulating layer 86 includes a first insulating layer 861 and a second insulating layer 862. The first insulating layer 861 is disposed on a side of the signal acquisition component 81 that is away from the bus bar 82 in the third direction Z, and the second insulating layer 862 is disposed on a side of the bus bar 82 that is away from the signal acquisition component 81 in the third direction Z. The first insulating layer 861 and the second insulating layer 862 are respectively hot-pressed films.

[0106] In some embodiments, reference Figure 1 and Figure 2 The battery pack 1 also includes a cover plate 90 and a bottom plate 91. The cover plate 90 covers the first opening 131 on the first wall 13 of the box body 10, and the bottom plate 91 covers the second opening (not shown in the figure) of the second wall 14 to form a seal for the box body 10. The bracket 20 is arranged on the bottom plate 91.

[0107] In some embodiments, the cover plate 90 is composed of a layer of high-strength steel plate and a layer of fiber-reinforced plate. The high-strength steel plate layer faces the signal acquisition component 81 in the first direction Z, and the fiber-reinforced plate faces away from the signal acquisition component 81 in the first direction Z. The fiber-reinforced plate can protect the cover plate 90 from damage by external forces or corrosion by harsh environments for a long time, thereby ensuring the reliability of the battery pack 1.

[0108] In some embodiments, the bottom plate 91 is composed of a layer of high-strength steel plate and a layer of fiber-reinforced plate. The high-strength steel plate layer faces the bracket 20 in the third direction Z, and the fiber-reinforced plate faces away from the bracket 20 in the third direction Z. The fiber-reinforced plate can protect the bottom plate 91 from damage by external forces or corrosion by harsh environments for a long time, thereby ensuring the reliability of the battery pack 1.

[0109] In some embodiments, reference Figure 2 The battery pack 1 also includes a BMS module 92 and a BUD module 93. Figure 1 , Figure 3 and Figure 5 A mounting frame is provided on the second side wall 12 of the box body 10 of the battery pack 1, and the BMS module 92 and the BUD module 93 are provided in the mounting frame.

[0110] 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 (X) and a third direction (Z) intersecting each other, characterized in that: The battery pack comprises: A box body (10) is provided with a receiving cavity (101) therein, the box body (10) comprises a first side wall (11), and a first flow guide cavity (110) is provided therein; A bracket (20) is arranged in the accommodating cavity (101), and a second flow guiding cavity (201) is provided inside the bracket (20); A battery cell (30) is arranged in the accommodating cavity (101); along the third direction (Z), the battery cell (30) and the bracket (20) are stacked; the bracket (20) has a supporting surface (21) facing the battery cell (30); a first through hole (22) communicating with the second flow guiding cavity (201) is provided on the supporting surface (21); a first explosion-proof valve (31) is provided at one end of the battery cell (30) adjacent to the supporting surface (21); the first explosion-proof valve (31) and the first through hole (22) are arranged opposite to each other; A second explosion-proof valve (40) is arranged on the first side wall (11), and an air inlet end of the second explosion-proof valve (40) is in communication with the first flow guide cavity (110); A protruding portion (111) is provided on a side of the first side wall (11) facing the battery cell (30) and protrudes along the first direction (X); a third flow guide cavity (112) is provided inside the protruding portion (111); the third flow guide cavity (112) is communicated with both the first flow guide cavity (110) and the second flow guide cavity (201).

2. The battery pack according to claim 1, characterized in that: In the first direction (X), one end of the bracket (20) adjacent to the protruding portion (111) overlaps with the protruding portion (111) along the third direction (Z), and the second guide cavity (201) is connected to the third guide cavity (112).

3. The battery pack according to claim 2, characterized in that: The protruding portion (111) comprises a first surface (111a) and a second surface (111b) which are arranged opposite to each other along the third direction (Z), and the first surface (111a) overlaps with the supporting surface (21) along the third direction (Z); Along the first direction (X), a second through hole (23) is provided at one end of the support surface (21) adjacent to the protruding portion (111), a third through hole (113) is provided on the first surface (111a), and the second through hole (23) and the third through hole (113) are arranged opposite to each other along the third direction (Z) to connect the second guide cavity (201) with the third guide cavity (112); Along the first direction (X), a protruding portion (24) is protrudingly provided at one end of the support surface (21) adjacent to the protruding portion (111), a fourth through hole (114) is opened on the first surface (111a), and the protruding portion (24) is inserted into the fourth through hole (114).

4. The battery pack according to claim 1, wherein: The battery pack further has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The bracket (20) comprises at least one rib plate (25), wherein the rib plate (25) is arranged in the second flow guide cavity (201), and the rib plate (25) extends along the first direction (X) to divide the second flow guide cavity (201) into at least two flow guide channels (202) arranged at intervals along the second direction (Y), and at least two of the flow guide channels (202) are connected to both the first flow guide cavity (110) and the third flow guide cavity (112).

5. The battery pack according to claim 1, wherein: The battery pack further comprises a fireproof plate (50), wherein the fireproof plate (50) is arranged between the battery cell (30) and the bracket (20); The fireproof plate (50) is configured to be able to be broken through by the thermal runaway gas generated by the battery cell (30) under a preset pressure.

6. The battery pack according to claim 1, wherein: The battery pack further has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The battery pack further comprises: A plurality of liquid cooling plates (60) are arranged in the accommodating cavity (101), the plurality of liquid cooling plates (60) are arranged at intervals along the second direction (Y), the liquid cooling plates (60) include a first end (601) and a second end (602) arranged opposite to each other along the first direction (X), a flow channel is provided inside the liquid cooling plate (60), the plurality of liquid cooling plates (60) include a first liquid cooling plate (61), a second liquid cooling plate (62) and a plurality of third liquid cooling plates (63); at least one battery cell (30) is arranged between two adjacent liquid cooling plates (60) along the second direction (Y); A first current collector (71) is arranged at the first end (601) of the first liquid cooling plate (61); a first liquid inlet cavity (711), a first liquid outlet cavity (712) and a liquid supply cavity (713) are arranged inside the first current collector (71); the first liquid inlet cavity (711) and the first liquid outlet cavity (712) are arranged at intervals and are respectively connected to the flow channel; the liquid supply cavity (713) is connected to the first liquid inlet cavity (711) and is arranged at intervals from the first liquid outlet cavity (712); A second current collector (72) is arranged at the first end (601) of the second liquid cooling plate (62); a second liquid inlet cavity (721), a second liquid outlet cavity (722) and a liquid return cavity (723) are arranged inside the second current collector (72); the second liquid inlet cavity (721) and the second liquid outlet cavity (722) are arranged at intervals and are respectively connected to the flow channel; the liquid return cavity (723) is connected to the second liquid outlet cavity (722) and is arranged at intervals from the second liquid inlet cavity (721); A third fluid collector (73) is arranged at the first end (601) of the third liquid cooling plate (63); a third liquid inlet cavity (731) and a third liquid outlet cavity (732) are arranged inside the third fluid collector (73); the third liquid inlet cavity (731) and the third liquid outlet cavity (732) are arranged at intervals and are respectively connected to the flow channel; Wherein, the first liquid inlet cavity (711), the second liquid inlet cavity (721) and the third liquid inlet cavity (731) are connected, and the first liquid outlet cavity (712), the second liquid outlet cavity (722) and the third liquid outlet cavity (732) are connected.

7. The battery pack according to claim 6, characterized in that: The first liquid cooling plate (61) and the second liquid cooling plate (62) are arranged at intervals along the second direction (Y), and a plurality of third liquid cooling plates (63) are arranged at intervals along the second direction (Y) between the first liquid cooling plate (61) and the second liquid cooling plate (62); The first liquid inlet cavity (711), the second liquid inlet cavity (721) and the third liquid inlet cavity (731) are connected along the second direction (Y); The first liquid outlet cavity (712), the second liquid outlet cavity (722) and the third liquid outlet cavity (732) are connected along the second direction (Y).

8. The battery pack according to claim 1, wherein: The battery pack also includes a busbar assembly (80) and a signal collection component (81); The busbar assembly (80) is arranged at one end of the battery cell (30) facing away from the bracket (20) in the third direction (Z), the signal collection component (81) is arranged at one side of the busbar assembly (80) facing away from the battery cell (30) in the third direction (Z), and a terminal (32) is arranged at one end of the battery cell (30) facing away from the bracket (20) in the third direction (Z); One end of the signal collecting member (81) in the first direction (X) is bent in a direction close to the battery cell (30) to form a first bent portion (811); The busbar assembly (80) comprises: A busbar (82) comprising a first connection end (821) and a second connection end (822) arranged opposite to each other along the first direction (X); a first output row (83) disposed on a side of the second connection end (822) away from the first connection end (821) in the first direction (X); along the first direction (X), a first output end (831) is disposed on a side of the first output row (83) adjacent to the second connection end (822); and a side of the first output row (83) away from the second connection end (822) is bent toward a direction close to the battery cell (30) to form a second bent portion (832); A second output row (84) is arranged on a side of the busbar (82) away from the first output row (83) in the first direction (X), and a second output end (841) is arranged on a side of the second output row (84) adjacent to the first connection end (821) along the first direction (X); A connecting piece (85), wherein the connecting piece (85) and the second bent portion (832) are overlapped along the first direction (X); Along the first direction (X), the first bent portion (811) is arranged on a side of the connecting piece (85) facing away from the second bent portion (832).

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises at least one insulating layer (86), wherein the insulating layer (86) is disposed between the busbar (82) and the battery cell (30), and an opening (860) is provided on the insulating layer (86), and the terminal (32) is exposed from the opening (860).

10. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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