Battery pack and electrical device

Abstract

Disclosed in the present application are a battery pack and an electrical device. In the battery pack, first flow guide cavities are provided inside a first side wall, supports are provided inside an accommodation cavity of a box body, and second flow guide cavities are provided inside the supports; a protruding portion is provided on the first side wall, and a third flow guide cavity is provided inside the protruding portion, the third flow guide cavity being in communication with both the first flow guide cavities and the second flow guide cavities; battery cells are stacked with the supports, first through holes are formed in the support surfaces of the supports, and first explosion-proof valves are provided on the battery cells, the first explosion-proof valves being arranged opposite to the first through holes; second explosion-proof valves are provided on the first side wall.

Description

Battery packs and electrical equipment

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202421168667.8, filed on May 27, 2024, entitled "Battery Pack and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery pack and electrical device. Background Technology

[0004] In a battery pack, the explosion-proof valve of a single cell is usually located at the top, that is, at the end of the single cell near the cover plate. However, the area between the single cell and the cover plate usually needs to be equipped with a CCS module (integrated busbar) to realize operations such as data acquisition of the single cell. When a single cell experiences thermal runaway, it needs to release the gas generated inside through the explosion-proof valve. However, the presence of the CCS module will block and interfere with the released gas, making it difficult for heat to be discharged from the battery pack in a timely and smooth manner, affecting the safety of the single cell and thus the safety of the battery pack. Technical solutions

[0005] A first aspect of this application provides a battery pack having a first vertical direction and a third vertical direction. The battery pack includes: a housing with an internal receiving cavity, the housing including a first sidewall with a first flow guide cavity inside the first sidewall; a bracket disposed in the receiving cavity with a second flow guide cavity inside the bracket; a battery cell disposed in the receiving cavity, stacked with the bracket along the third vertical direction, the bracket having a support surface facing the battery cell, a first through hole communicating with the second flow guide cavity on the support surface, a first explosion-proof valve disposed at one end of the battery cell adjacent to the support surface, the first explosion-proof valve being disposed opposite to the first through hole; a second explosion-proof valve inserted into the first sidewall, the air inlet of the second explosion-proof valve communicating with the first flow guide cavity; and a protrusion protruding along the first direction from the side of the first sidewall facing the battery cell, the protrusion having a third flow guide cavity inside, the third flow guide cavity communicating with both the first flow guide cavity and the second flow guide cavity.

[0006] Optionally, in the first direction, one end of the bracket adjacent to the protrusion is stacked with the protrusion along the third direction, and the second flow guide cavity communicates with the third flow guide cavity.

[0007] Optionally, the protrusion includes a first surface and a second surface disposed opposite to each other along the third direction, the first surface and the supporting surface being stacked along the third direction; along the first direction, a second through hole is formed at one end of the supporting surface adjacent to the protrusion, a third through hole is formed on the first surface, the second through hole and the third through hole are disposed opposite to each other along the third direction to connect the second guide cavity and the third guide cavity; along the first direction, a protruding part is formed at one end of the supporting surface adjacent to the protrusion, a fourth through hole is formed on the first surface, and the protruding part is inserted into the fourth through hole.

[0008] Optionally, the battery pack further includes a second buffer member, which is disposed at the location where the second through hole is opened on the support surface, and the second buffer member surrounds the second through hole in the circumferential direction.

[0009] Optionally, a fifth through hole is provided on the second surface, and a sixth through hole is provided on the side of the first sidewall facing the battery cell in the first direction, and the fifth through hole communicates with the sixth through hole.

[0010] Optionally, a cover plate is provided on the side of the first sidewall facing the battery cell in the first direction, and the cover plate covers the connection between the fifth through hole and the sixth through hole.

[0011] Optionally, the battery pack further has a second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the bracket includes at least one stiffener disposed in the second flow guiding cavity, the stiffener extending along the first direction to divide the second flow guiding cavity into at least two flow guiding channels spaced apart along the second direction, and the at least two flow guiding channels are in communication with both the first flow guiding cavity and the third flow guiding cavity.

[0012] Optionally, the battery pack further includes a fireproof plate disposed between the battery cell and the bracket; the fireproof plate is configured to be ruptured by the thermal runaway gas generated by the battery cell under a preset pressure.

[0013] Optionally, the battery pack further includes a first buffer member, which is disposed on the side of the fireproof plate facing away from the bracket in the third direction, and the first buffer member corresponds to the area where the first through hole is opened on the support surface. The first buffer member is provided with an exhaust hole that passes through the first buffer member in the third direction, and the exhaust hole is disposed opposite to the first through hole on the bracket in the third direction.

[0014] Optionally, the battery pack further has a second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the battery pack further includes: a plurality of liquid cooling plates disposed in the receiving cavity, the plurality of liquid cooling plates being spaced apart along the second direction, each liquid cooling plate including a first end and a second end disposed opposite to each other along the first direction, each liquid cooling plate having a flow channel inside, the plurality of liquid cooling plates including a first liquid cooling plate, a second liquid cooling plate, and a plurality of third liquid cooling plates; at least one battery cell is disposed between two adjacent liquid cooling plates along the second direction; a first current collector disposed at the first end of the first liquid cooling plate, the first current collector having a first liquid inlet chamber, a first liquid outlet chamber, and a liquid supply chamber inside, the first liquid inlet chamber and the first liquid outlet chamber being spaced apart and respectively communicating with the flow channel, The liquid supply chamber is connected to the first liquid inlet chamber and spaced apart from the first liquid outlet chamber; the second liquid collector is disposed at the first end of the second liquid cooling plate, and the second liquid collector has a second liquid inlet chamber, a second liquid outlet chamber and a return liquid chamber inside, the second liquid inlet chamber and the second liquid outlet chamber are spaced apart and respectively connected to the flow channel, the return liquid chamber is connected to the second liquid outlet chamber and spaced apart from the second liquid inlet chamber; the third liquid collector is disposed at the first end of the third liquid cooling plate, and the third liquid collector has a third liquid inlet chamber and a third liquid outlet chamber inside, the third liquid inlet chamber and the third liquid outlet chamber are spaced apart and respectively connected to 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.

[0015] Optionally, the first liquid cooling plate and the second liquid cooling plate are spaced apart along the second direction, and a plurality of third liquid cooling plates are spaced apart between the first liquid cooling plate and the second liquid cooling plate along the second direction; the first liquid inlet chamber, the second liquid inlet chamber and the third liquid inlet chamber are connected along the second direction; the first liquid outlet chamber, the second liquid outlet chamber and the third liquid outlet chamber are connected along the second direction.

[0016] Optionally, the battery pack further includes a bus assembly and a signal acquisition device; the bus assembly is disposed at the end of the battery cell facing away from the bracket in the third direction, and the signal acquisition device is disposed on the side of the bus assembly facing away from the battery cell in the third direction; the battery cell has a terminal at the end facing away from the bracket in the third direction; one end of the signal acquisition device in the first direction is bent towards the battery cell to form a first bend; the bus assembly includes: a bus, including a first connection end and a second connection end disposed opposite to each other in the first direction; a first output bus, disposed at the second connection end in the first direction. A first output terminal is provided on the side of the busbar facing away from the first connection terminal in the first direction, adjacent to the second connection terminal. The side of the first output busbar facing away from the second connection terminal is bent towards the battery cell to form a second bend. A second output busbar is provided on the side of the busbar facing away from the first output terminal in the first direction, adjacent to the first connection terminal in the first direction. A connecting piece is stacked with the second bend in the first direction. The first bend is provided on the side of the connecting piece facing away from the second bend in the first direction.

[0017] Optionally, the battery pack further includes at least one insulating layer disposed between the busbar and the battery cell, the insulating layer having an opening through which the terminal is exposed.

[0018] Optionally, the insulating layer includes a first insulating layer and a second insulating layer, wherein the first insulating layer is disposed on the side of the signal acquisition device facing away from the bus in the third direction Z, and the second insulating layer is disposed on the side of the bus facing away from the signal acquisition device in the third direction Z.

[0019] A second aspect of this application provides an electrical device including the battery pack described above. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a schematic diagram of the battery pack provided in an embodiment of this application;

[0022] Figure 2 is an exploded view of Figure 1;

[0023] Figure 3 is a partial structural schematic diagram of the battery pack provided in an embodiment of this application;

[0024] Figure 4 is an enlarged structural diagram of point A in Figure 3;

[0025] Figure 5 is a schematic diagram of the combined structure of the housing and bracket in the battery pack provided in the embodiment of this application;

[0026] Figure 6 is a sectional view along the BB direction of Figure 5;

[0027] Figure 7 is an enlarged structural diagram of point C in Figure 6;

[0028] Figure 8 is a schematic diagram of the combined structure of the bottom plate, bracket, fireproof plate, first buffer and second buffer in the battery pack provided in the embodiment of this application;

[0029] Figure 9 is a schematic diagram of the structure of the bracket in the battery pack provided in the embodiment of this application;

[0030] Figure 10 is an enlarged structural diagram of point D in Figure 9;

[0031] Figure 11 is a structural schematic diagram of the first angle of the first sidewall in the battery pack provided in the embodiment of this application;

[0032] Figure 12 is a structural schematic diagram of the second angle of the first sidewall in the battery pack provided in the embodiment of this application;

[0033] Figure 13 is a schematic diagram of the combined structure of the battery cell and liquid cooling plate in the battery pack provided in the embodiment of this application from a first angle.

[0034] Figure 14 is a second-angle structural schematic diagram of the combined structure of a battery cell and a liquid cooling plate in the battery pack provided in the embodiment of this application.

[0035] Figure 15 is a schematic diagram of the first angle of the first current collector in the battery pack provided in the embodiment of this application;

[0036] Figure 16 is a schematic diagram of the second angle of the first current collector in the battery pack provided in the embodiment of this application;

[0037] Figure 17 is a schematic diagram of the first angle of the second current collector in the battery pack provided in the embodiment of this application;

[0038] Figure 18 is a schematic diagram of the second angle of the second current collector in the battery pack provided in the embodiment of this application;

[0039] Figure 19 is a schematic diagram of the first angle of the third current collector in the battery pack provided in the embodiment of this application;

[0040] Figure 20 is a structural schematic diagram of the third current collector in the battery pack provided in the embodiment of this application from a second angle;

[0041] Figure 21 is a schematic diagram of the combined structure of the bus assembly, signal acquisition device and insulating layer in the battery pack provided in the embodiment of this application;

[0042] Figure 22 is a partial structural schematic diagram of the busbar assembly in the battery pack provided in the embodiment of this application;

[0043] Figure 23 is a schematic diagram of the structure of a single battery cell in the battery pack provided in the embodiments of this application.

[0044] Key reference numerals in the attached drawings: 1. Battery pack; 10. Housing; 101. Receiving cavity; 11. First side wall; 110. First flow channel; 1101. Partition; 111. Protrusion; 111a. First surface; 111b. Second surface; 112. Third flow channel; 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. Sheath; 20. Bracket; 201. Second flow channel; 202. Flow channel; 21. Support surface; 22. First through hole; 23. Second through hole; 24. Protrusion; 25. Rib; 30. Battery cell; 31. First explosion-proof valve; 32. Terminal; 321. Positive terminal; 322. Negative terminal; 40. Second explosion-proof valve; 50. Fireproof plate; 51. First buffer component; 52. Second buffer component; 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. Sealing component; 71. First manifold; 711. First liquid inlet chamber; 712. First liquid outlet chamber; 713. Liquid supply chamber; 714. First side plate; 715. Second side plate; 716. First partition plate; 717. First convex ring; 7171. First sealing plate; 7181. First liquid inlet connector; 7182. First liquid outlet connector; 7183. Liquid supply connector; 72. Second manifold; 721. Second inlet chamber; 722. Second outlet chamber; 723. Return chamber; 724. Third side plate; 725. Fourth side plate; 726. Second partition plate; 727. Second protruding ring; 7271. Second sealing plate; 7281. Second inlet connector; 7282. Second outlet connector; 7283. Return connector; 73. Third manifold; 731. Third inlet chamber; 732. Third outlet chamber; 733. Fifth side plate; 734. Sixth side plate; 735. Third partition plate; 736. Third inlet connector; 737. Third outlet connector; 74. Inlet pipe; 75. Outlet pipe; 76. Supply pipe; 761. Supply plug; 77. Return pipe; 771. Return plug; 80. Busbar assembly; 81. Signal acquisition component; 811. First bend; 82. Busbar; 821. First connection terminal; 822. Second connection terminal; 823. Connecting arm; 83. First output row; 831. First output terminal; 832. Second bend; 84. Second output row; 841. Second output terminal; 85. Connecting piece; 86. Insulating layer; 860. Opening; 861. First insulating layer; 862. Second insulating layer; 87. Connector; 871. Mounting plate; 872. Socket; 90. Cover plate; 91. Base plate; 92. BMS module; 93. BDU module; X, First direction; Y, Second direction; Z, Third direction.

[0045] Implementation methods of this application

[0046] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further clarifies this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0047] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances or equal angles refer to a state in which the tolerance range is -1% to 1%.

[0051] This embodiment provides an electrical device, including a battery pack 1, which serves as the power supply for the device. The electrical device may be, but is not limited to, mobile devices (e.g., mobile phones, laptops), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0052] In some embodiments of this application, a battery pack 1 is provided. Referring to Figures 1-13 and Figure 23, the battery pack 1 includes: a housing 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 are perpendicular to each other. Specifically, in the embodiments shown in Figures 1-7, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other.

[0053] Referring to Figure 2, the housing 10 has an internal receiving cavity 101. Referring to Figures 1, 3, and 5-6, the housing 10 includes a first sidewall 11 and a second sidewall 12 disposed opposite each other along a first direction X. Referring to Figures 4, 6-7, and 11-12, the first sidewall 11 has an internal first flow guiding cavity 110, which extends along a second direction Y. In the embodiments shown in Figures 1-7, the first direction X is parallel to the length direction of the housing 10, the second direction Y is parallel to the width direction of the housing 10, and the third direction Z is parallel to the height direction of the housing 10.

[0054] Referring to Figures 2 to 10, the bracket 20 is disposed in the receiving cavity 101 of the box 10. Specifically, in the embodiments shown in Figures 3 to 7, the bracket 20 is disposed at the bottom inner side of the box 10. Referring to Figures 6, 7 and 10, the bracket 20 is provided with a second flow guiding cavity 201 inside.

[0055] Referring to Figures 2 and 3, the battery cell 30 is disposed in the receiving cavity 101 of the housing 10. Referring to Figures 3 and 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 support surface 21 facing the battery cell 30. Referring to Figures 5, 7 to 10, a first through hole 22 communicating with the second guide cavity 201 is opened on the support surface 21. In other words, a first through hole 22 is opened on the support surface 21 along the third direction Z. Referring to Figure 23, a first explosion-proof valve 31 is provided at one end of the battery cell 30 adjacent to the support 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 along the third direction Z. In the embodiments shown in Figures 2-4, 13, and 23, the battery cell 30 is a cylindrical battery. In other implementations, the battery cell 30 can be a square battery or a battery cell of other shapes. This application does not limit the shape and number of battery cells 30, as long as the first explosion-proof valve 31 is disposed at one end of the battery cell 30 adjacent to the support surface 21 in the third direction Z when the battery cell 30 is assembled inside the receiving cavity 101, and the first explosion-proof valve 31 and the first through hole 22 are disposed opposite each other in the third direction Z. Referring to Figure 23, the height direction of the battery cell 30 is parallel to the third direction Z, that is, the battery cell 30 is disposed in the receiving cavity 101 in the third direction Z.

[0056] Referring to Figures 1 and 7, the second explosion-proof valve 40 is inserted into the first side wall 11 of the housing 10. The air inlet 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 housing 10.

[0057] Referring to Figures 4 to 7 and Figures 11 to 12, the protrusion 111 protrudes along the first direction X on the side of the first sidewall 11 facing the battery cell 30. The protrusion 111 has a third flow guiding cavity 112 inside. The third flow guiding cavity 112 is connected to both the first flow guiding cavity 110 and the second flow guiding cavity 201. Specifically, in the embodiment shown in Figure 7, the second flow guiding cavity 201 is connected to the first flow guiding cavity 110 through the third flow guiding cavity 112.

[0058] In a battery pack, the explosion-proof valve of a single cell is usually located at the top of the cell in its height direction, that is, at the end of the cell adjacent to the battery pack cover. However, the space between the cell and the cover usually needs to accommodate a CCS (Clean Cell Detection and Control) module to collect data such as temperature and current of the cell. When a cell experiences thermal runaway, the runaway gas is discharged through the explosion-proof valve. However, the presence of the CCS module can obstruct and interfere with the discharge of the runaway gas, making it difficult for the gas to be discharged from the outside of the battery pack in a timely and smooth manner. This affects the safety of the single cell and, consequently, the safety of the entire battery pack.

[0059] The battery pack 1 provided in this application embodiment has a first flow guiding cavity 110 inside the first side wall 11 of the housing 10, a bracket 20 inside the receiving cavity 101 of the housing 10, a second flow guiding cavity 201 inside the bracket 20, and a protrusion 111 on the side of the first side wall 11 facing the battery cell 30 in the first direction X. A third flow guiding cavity 112 is provided 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, so that the second flow guiding cavity 201 inside the bracket 20 is connected to the first flow guiding cavity 110 inside the first side wall 11 through the third flow guiding cavity 112. The battery cell 30 is placed on the support surface 21 of the bracket 20, such that the battery cell 30 and the bracket 20 are stacked along the third direction Z. A first explosion-proof valve 31 is provided at the end of the battery cell 30 adjacent to the support surface 21 along the third direction Z. The first explosion-proof valve 31 and the first through hole 22 are positioned opposite each other along the third direction Z. A second explosion-proof valve 40 is provided on the first side wall 11. The air inlet of the second explosion-proof valve 40 is connected to the first guide cavity 110, thereby forming an exhaust and 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. The first explosion-proof valve 31 on the battery cell 30 is located at the end of the battery cell 30 away from the CCS assembly in the third direction Z. When the battery cell 30 experiences thermal runaway, the generated thermal runaway gas is discharged through the first explosion-proof valve 31. The discharged first explosion-proof valve 31 enters the second guide cavity 201 through the first through hole 22 on the bracket 20. 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 housing 10 through the second explosion-proof valve 40. This allows the thermal runaway gas generated by the battery cell 30 due to thermal runaway to be discharged to the outside of the battery pack 1 through the bracket 20 located at the bottom of the inner side of the receiving cavity 101. The thermal runaway gas does not need to be discharged through the battery cell 30 at the end adjacent to the CCS component in the third direction Z. The discharged thermal runaway gas will not be blocked or interfered with 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, avoiding leakage of thermal runaway gas inside the housing 10. This allows the thermal runaway gas to be discharged to the outside of the battery pack 1 in a timely and smooth manner, ensuring the safety of the battery cell and thus ensuring the safety of the battery pack 1 and the electrical equipment.

[0060] In some embodiments, referring to Figures 4, 6, and 7, in the first direction X, one end of the bracket 20 adjacent to the protrusion 111 is stacked with the protrusion 111 along the third direction Z. The second flow guiding cavity 201 is connected to the third flow guiding cavity 112. Specifically, the bracket 20 is disposed in the receiving cavity 101 along the first direction X. One end of the bracket 20 adjacent to the first sidewall 11 in the first direction X is stacked with the protrusion 111 along the third direction Z. Specifically, in the embodiments shown in Figures 4, 6, and 7, along the third direction Z, the protrusion 111 is on top and the bracket 20 is on the bottom. The structural design of the bracket 20 and the protrusion 111 stacked along the third direction Z allows thermal runaway gas to directly enter the third flow guiding cavity 112, avoiding thermal runaway gas leakage into the receiving cavity 101, ensuring the safety of other battery cells 30 and components, and making full use of the internal space of the receiving cavity 101.

[0061] In some embodiments, referring to Figures 4, 7, 11, and 12, the protrusion 111 includes a first surface 111a and a second surface 111b disposed opposite each other along a third direction Z. The first surface 111a overlaps with the support surface 21 of the bracket 20 along a third direction Z. Referring to Figures 7, 9, and 10, a second through hole 23 is formed on the support surface 21 of the bracket 20 near one end of the protrusion 111 in a first direction X. Referring to Figures 7 and 12, a third through hole 113 is formed on the first surface 111a of the protrusion 111. The third through hole 113 extends along the third direction X. The direction Z penetrates through the first surface 111a and communicates with the third guide cavity 112. The second through hole 23 on the bracket 20 and the third through hole 113 on the protrusion 111 are arranged opposite to each other along the third direction Z and communicate with each other to connect the second guide cavity 201 and the third guide cavity 112. The structural design of the second through hole 23 and the third through hole 113 communicating along the third direction Z allows the second guide cavity 201 and the third guide cavity 112 to be connected, which facilitates the thermal runaway gas to enter the third guide cavity 112 through the second guide cavity 201 and ensures the smooth discharge of the thermal runaway gas.

[0062] In some embodiments, referring to Figures 7 and 9-10, the second through hole 23 extends along the second direction Y to form a strip-shaped hole structure, and referring to Figure 12, the third through hole 113 extends along the second direction Y to form a strip-shaped hole structure, so as to ensure that the thermal runaway gas is smoothly discharged into the third guide cavity 112. In some embodiments, the second through hole 23 and the third through hole 113 correspond one-to-one in number. In other implementations, the number of one of the second through holes 23 and the third through hole 113 can be in other ways, such as one second through hole 23 corresponding to two or more third through holes 113, or one third through hole 113 corresponding to two or more second through holes 23. In some embodiments, the second through hole 23 and the third through hole 113 can 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 hole 23 and the third through hole 113.

[0063] In some embodiments, referring to Figures 4 and 9-10, the support surface 21 of the bracket 20 has a protrusion 24 protruding from one end of the protrusion 111 in the first direction X. Specifically, the protrusion 24 protrudes from the support surface 21 in the third direction Z. Referring to Figure 12, a fourth through hole 114 is provided on the first surface 111a of the protrusion 111. Specifically, the fourth through hole 114 penetrates the first surface 111a in the third direction Z and communicates with the third guide cavity 112. Referring to Figures 9 and 10, the second through hole 23 and the protrusion 24 are spaced apart in the second direction Y. The bracket 20 and the protrusion 111 are stacked along the third direction Z. The protrusion 24 is inserted into the fourth through hole 114, thereby fixing the bracket 20 and the protrusion 111, ensuring the assembly stability between the bracket 20 and the protrusion 111, and preventing misalignment between the second through hole 23 and the third through hole 113 due to shaking or impact of the battery pack 1, which would affect the discharge of thermal runaway gas, thus ensuring the smooth discharge of thermal runaway gas.

[0064] In some embodiments, referring to Figures 9 and 10, the support 20 includes at least one stiffener 25 disposed in the second flow guiding cavity 201. The stiffener 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 in communication with both the first flow guiding cavity 110 and the third flow guiding cavity 112. Referring to Figures 2, 3, and 13, the battery pack 1 contains multiple battery cells 30. These multiple battery cells 30 are arranged along the first direction X to form a battery column. Multiple battery columns are arranged along the second direction Y to form a battery pack. One flow channel 202 corresponds to one battery column, so that the thermal runaway gas emitted by the battery cells 30 in the same column during thermal runaway can be discharged into the same flow channel 202. Then, it is discharged uniformly through the third flow cavity 112 to the first flow cavity 110 and through the second explosion-proof valve 40 to the outside of the battery pack 1, ensuring the smooth discharge of thermal runaway gas. Moreover, the setting of the stiffener 25 ensures that the discharged thermal runaway gas will not affect the battery cells 30 in other columns, preventing the battery cells 30 in other columns that have not experienced thermal runaway from being affected by the discharged thermal runaway gas and causing thermal runaway, thereby reducing the spread rate of thermal runaway.

[0065] In some embodiments, referring to Figures 7 and 11, a fifth through hole 115 is provided on the second surface 111b of the protrusion 111. Referring to Figures 7, 11 and 12, a sixth through hole 116 is provided on the side of the first sidewall 11 facing the battery cell 30 in the first direction X. Specifically, the sixth through hole 116 is provided on the side of the first sidewall 11 where the protrusion 111 is located in the first direction X. The fifth through hole 115 communicates 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 sidewall 11. The air inlet end of the second explosion-proof valve 40 is arranged opposite to the sixth through hole 116 in the first direction X. Specifically, in the embodiment shown in Figure 7, the air inlet end of the second explosion-proof valve 40 is inserted into the sixth through hole 116 to facilitate the smooth entry of thermal runaway gas into the first guide cavity 110 into the third guide cavity 112, and then discharged to the outside of the battery pack 1 through the second explosion-proof valve 40, ensuring smooth discharge.

[0066] In some embodiments, referring to Figures 3, 5 and 6, a shield 15 is provided on the side of the first sidewall 11 facing the battery cell 30 in the first direction X. The shield 15 covers the connection between the fifth through hole 115 and the sixth through hole 116 to form a shield for the fifth through hole 115 and the sixth through hole 116, so as to prevent 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, and prevent the thermal runaway gas from affecting other components inside the housing cavity 101.

[0067] In some embodiments, referring to Figures 2 and 8, the battery pack 1 further includes a fireproof plate 50, which is disposed between the battery cell 30 and the support 20. The fireproof plate 50 is configured to be ruptured 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 may be a mica plate or a mica sheet made of multiple layers of mica paper. When the battery cell 30 experiences thermal runaway, the generated thermal runaway gas flow can rupture the fireproof plate 50 and enter the second guide cavity 201. The fireproof plate 50 forms a barrier between the second guide cavity 201 and the battery cells 30 that have not experienced thermal runaway. That is, the fireproof plate 50 corresponding to the battery cells 30 that have not experienced thermal runaway is not ruptured, thus preventing the thermal runaway gas entering the second guide cavity 201 from having a thermal impact on the battery cells 30 that have not experienced thermal runaway, thereby preventing the spread of thermal runaway and ensuring the safety of the battery pack 1.

[0068] In some embodiments, referring to FIG8, the battery pack 1 further includes a first buffer member 51. The first buffer member 51 is disposed on the side of the fireproof plate 50 facing away from the bracket 20 in the third direction Z, and the first buffer member 51 corresponds to the area where the first through hole 22 is opened on the support surface 21 of the bracket 20. The first buffer member 51 is provided with an exhaust hole (not shown in the figure) that runs through the first buffer member 51 in the third direction Z. The exhaust hole and the first through hole 22 on the bracket 20 are disposed opposite to each other in the third direction Z. The first buffer member 51 is a cushioning foam. The first buffer member 51 can form a seal for the assembly gap between the bracket 20 and the battery cell 30, preventing the thermal runaway gas generated by the battery cell 30 from leaking from the assembly gap.

[0069] In some embodiments, referring to FIG8, the battery pack 1 further includes a second buffer member 52. The second buffer member 52 is disposed at the location where the second through hole 23 is opened on the support surface 21 of the bracket 20. The second buffer member 52 is annular in shape and surrounds the second through hole 23 in the circumferential direction. The second buffer member 52 is a cushioning foam. The second buffer member 52 can form a seal for the assembly gap between the bracket 20 and the protrusion 111, preventing 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.

[0070] In some embodiments, referring to Figures 13-14, the battery pack 1 further includes a plurality of liquid cooling plates 60. The liquid cooling plates 60 extend along a first direction X, and the plurality of liquid cooling plates 60 are spaced apart along a second direction Y in the receiving cavity 101 of the housing 10. Referring to Figures 13-14, each liquid cooling plate 60 includes a first end 601 and a second end 602 disposed opposite to each other along the first direction X. The liquid cooling plate 60 has a flow channel (not shown in the figure) for the flow of a heat-conducting medium. Referring to Figure 14, the plurality of liquid cooling plates 60 includes a first liquid cooling plate 61, a second liquid cooling plate 62, and a plurality of third liquid cooling plates 63. Liquid cooling plate 61 and second liquid cooling plate 62 are spaced apart along the second direction Y. Multiple liquid cooling plates 63 are spaced apart along the second direction Y between the first liquid cooling plate 61 and the second liquid cooling plate 62. At least one battery cell 30 is disposed between two adjacent liquid cooling plates 60 along the second direction Y. Specifically, in the embodiment shown in FIG13, a liquid cooling plate 60 is disposed between two adjacent battery cells 30 along the second direction Y. In other words, a liquid cooling plate 60 is disposed between two adjacent battery rows along the second direction Y. The battery cell 30 abuts against the liquid cooling plate 60 along the second direction Y.

[0071] The internal flow channel of the liquid cooling plate 60 extends 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 an inlet flow channel and an outlet flow channel. The inlet flow channel and the outlet flow channel are spaced apart along the third direction Z, and the ends of the inlet flow channel and the outlet flow channel adjacent to the second end 602 in the first direction X are connected to each other to realize the flow of the heat transfer medium in the flow channel. Through the contact between the liquid cooling plate 60 and the battery cell 30, heat exchange occurs between the battery cell 30 and the battery cell 30, so that the battery cell 30 is in a suitable operating temperature range, ensuring the service life and safety of the battery cell 30.

[0072] In some embodiments, referring to Figures 13 and 14, the liquid cooling plate 60 further includes a sealing member 64, which is disposed at the second end 602 of the liquid cooling plate 60 in the first direction X to seal the flow channel inside the liquid cooling plate 60.

[0073] In some embodiments, referring to Figures 13 and 14, the liquid cooling plate 60 is provided with a plurality of arc-shaped surfaces, which abut against the side of the cylindrical battery cell 30. This increases the contact area between the battery cell 30 and the liquid cooling plate 60, thereby improving the heat transfer efficiency between the liquid cooling plate 60 and the battery cell 30 when the temperature of the battery cell 30 is too high, thereby reducing the risk of thermal runaway of the battery cell 30.

[0074] In some embodiments, the liquid cooling plate 60 is provided with a number of reinforcing ribs (not shown in the figure), which enhance the overall structural strength of the liquid cooling plate 60, divide the flow channel into multiple sub-flow channels, increase the flow velocity of the heat transfer medium in the flow channel, and ensure the heat transfer efficiency between the liquid cooling plate 60 and the battery cell 30.

[0075] In some embodiments, the liquid cooling plate 60 is made of aluminum alloy, which has good strength and rigidity, and the surface is coated with an insulating layer 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 PA12, PPO, PPS and other plastic materials, which have good strength and rigidity. Plastic materials themselves have good insulation properties, so there is no need to apply an additional insulating layer, thereby reducing the cost of the liquid cooling plate 60.

[0076] In some embodiments, referring to FIG13, a plurality of 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 improving the space utilization of the battery pack 1.

[0077] In some embodiments, referring to 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, an inlet pipe 74, an outlet pipe 75, a supply pipe 76, a supply plug 761, a return pipe 77, and a return plug 771.

[0078] Referring to Figure 14, the first current collector 71 is disposed at the first end 601 of the first liquid cooling plate 61. Referring to Figures 15 and 16, the first current collector 71 is provided with a first liquid inlet chamber 711, a first liquid outlet chamber 712, and a liquid supply chamber 713. Referring to Figure 16, the first liquid inlet chamber 711 and the first liquid outlet chamber 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 chamber 711 is connected to the liquid inlet flow channel in the flow channel of the first liquid cooling plate 61, the first liquid outlet chamber 712 is connected to the liquid outlet flow channel in the flow channel of the first liquid cooling plate 61, and the liquid supply chamber 713 is connected to the first liquid inlet chamber 711 and spaced apart from the first liquid outlet chamber 712. That is, the liquid supply chamber 713 is not connected to the first liquid outlet chamber 712.

[0079] Referring to Figures 15 and 16, the first current collector 71 further includes a first side plate 714, a second side plate 715, a first partition 716, a first protruding ring 717, a first liquid inlet connector 7181, a first liquid outlet connector 7182, and a liquid supply connector 7183. The first side plate 714 and the second side plate 715 are spaced apart along the second direction Y and define a first receiving cavity (not shown in the figures). The first partition 716 is disposed in the first receiving cavity and divides the first receiving 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 protruding ring 717 protrudes from the second side plate 715, and a liquid supply cavity 713 is defined between the first protruding ring 717 and the second side plate 715. The first liquid inlet connector 7181 is inserted into the first side plate 7182. Plate 714 is connected to the first liquid inlet chamber 711. Specifically, the first liquid inlet connector 7181 extends into the inner side of the first accommodating cavity and has a first connecting hole that communicates with the first liquid inlet chamber 711. The first liquid outlet connector 7182 is inserted into the first side plate 714 and communicates with the first liquid outlet chamber 713. Specifically, the first liquid outlet connector 7182 extends into the inner side of the first accommodating cavity and has a second connecting hole that communicates with the first liquid outlet chamber 712. The liquid supply connector 7183 passes through the first collector 71 and extends into the liquid supply chamber 713, so as to communicate with both the first liquid inlet chamber 711 and the liquid supply chamber 713. Specifically, the liquid supply connector 7183 extends into the inner side of the first accommodating cavity and has a third connecting hole that communicates with the first liquid inlet chamber 711, thereby forming a three-hole collector structure of the first collector 71.

[0080] Referring to Figure 14, the second current collector 72 is disposed at the first end 601 of the second liquid cooling plate 62. Referring to Figures 17 and 18, the second current collector 72 is provided with a second liquid inlet chamber 721, a second liquid outlet chamber 722, and a liquid return chamber 723. Referring to Figure 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 channels 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 channels of the second liquid cooling plate 62. The second liquid outlet chamber 722 is connected to the liquid outlet channel in the flow channel of 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 the mixing of liquid inlet and outlet and affecting the heat exchange efficiency between the liquid cooling plate 60 and the battery cell 30.

[0081] Referring to Figures 17 and 18, the second current collector 72 further includes a third side plate 724, a fourth side plate 725, a second partition 726, a second protruding ring 727, a second liquid inlet connector 7281, a second liquid outlet connector 7282, and a liquid return connector 7283. The third side plate 724 and the fourth side plate 725 are spaced apart along the second direction Y and define a second receiving cavity (not shown in the figures). The second partition 726 is disposed in the second receiving cavity and divides the second receiving cavity to form a second liquid inlet cavity 721 and a second liquid outlet cavity 722. The fourth side plate 725 faces the first liquid cooling plate 61 in the second direction Y. The second protruding ring 727 protrudes from the third side plate 724, defining a liquid return cavity 723 between the second protruding ring 727 and the third side plate 724. The second liquid inlet connector 7281 is inserted into the fourth side plate 725 and communicates with the second liquid inlet cavity 721. Specifically, the second liquid inlet connector 7281 extends into the second receiving cavity. One end of the second liquid inlet 722 is provided with a fourth connecting hole that communicates with the second liquid outlet 721. The second liquid outlet connector 7282 is inserted into the fourth side plate 725 and communicates with the second liquid outlet 722. Specifically, the end of the second liquid outlet connector 7282 that extends into the second accommodating cavity is provided with a fifth connecting hole that communicates with the second liquid outlet 722. The return liquid connector 7283 passes through the second current collector 72 and extends into the return liquid cavity 723 so as to communicate with both the second liquid outlet 722 and the return liquid cavity 723. Specifically, the end of the return liquid connector 7283 that extends into the second accommodating cavity is provided with a sixth connecting hole that communicates with the second liquid outlet 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 722 communicates with the return liquid cavity 723 and is spaced apart from the second liquid inlet 721, thereby avoiding mixing between the liquid inlet and outlet and affecting the heat exchange efficiency between the liquid cooling plate 60 and the battery cell 30.

[0082] Referring to Figure 14, the third current collector 73 is disposed at the first end 601 of the third liquid cooling plate 63. Referring to Figures 19 and 20, the third current collector 73 is provided with a third liquid inlet chamber 731 and a third liquid outlet chamber 732. The third liquid inlet chamber 731 and the third liquid outlet chamber 732 are spaced apart 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 chamber 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 chamber 732 is connected to the liquid outlet flow channel in the flow channel in the third liquid cooling plate 63.

[0083] Referring to Figures 19 and 20, the third manifold 73 further includes a fifth side plate 733, a sixth side plate 734, a third partition 735, a third liquid inlet connector 736, and a third liquid outlet connector 737. The fifth side plate 733 and the sixth side plate 734 are spaced apart along the second direction Y and define a third accommodating cavity (not shown in the figures). The third partition 735 is disposed in the third accommodating cavity and divides the third accommodating cavity to form a third liquid inlet cavity 731 and a third liquid outlet cavity 732. The third liquid inlet connector 736 penetrates the third manifold 73 along the second direction Y and communicates with the third liquid inlet cavity 731. Specifically, the third liquid inlet connector 736... A seventh connecting hole communicating with the third liquid inlet chamber 731 is provided at the inner end of the third accommodating cavity. The third liquid outlet connector 737 passes through the third current collector 73 along the second direction Y and communicates with the third liquid outlet chamber 732. Specifically, the third liquid outlet connector 737 is provided with an eighth connecting hole communicating with the third liquid outlet chamber 732 at the inner end of the third accommodating cavity, 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 alternately to avoid mixing between the liquid inlet and outlet, which would affect the heat exchange efficiency between the liquid cooling plate 60 and the battery cell 30.

[0084] Referring to Figure 1, the liquid supply plug 761 and the liquid return plug 771 are respectively inserted into the first side wall 11 of the housing 10. Referring to Figure 14, the liquid supply plug 761 is connected to the liquid supply connector 7183 on the first collector 71 through the liquid supply pipe 76, and the liquid return plug 771 is connected to the liquid return connector 7283 on the second collector 72 through the liquid return pipe 77. The first liquid inlet connector 7181 on the first collector 71, the third liquid inlet connector 736 on the third collector 73, and the second liquid inlet connector 7281 on the second collector 72 are connected along the second direction Y through the liquid inlet pipe 74, so that the first liquid inlet chamber 711, the third liquid inlet chamber 731, and the second liquid inlet chamber 721 are connected along the second direction Y. The first liquid outlet connector 7182 on the first current collector 71, the third liquid outlet connector 737 on the third current collector 73, and the second liquid outlet connector 7282 on the second current collector 72 are connected along the second direction Y via the liquid outlet pipe 75, thereby connecting the first liquid outlet chamber 712, the third liquid outlet chamber 732, and the second liquid outlet chamber 722 along the second direction Y. This allows the liquid cooling supply and return systems in the battery pack 1 to be located at the same end of the liquid cooling plate 60 in the first direction X, improving the space utilization of the internal accommodating cavity 101 of the housing 10.

[0085] The connection between the supply pipe 76 and the supply plug 761 and the supply connector 7183 is a quick-connect structure; the connection between the return pipe 77 and the supply connector 7183, the return plug 771 and the return connector 7283 is a quick-connect structure; the connection between the inlet pipe 74 and the first inlet connector 7181, the third inlet connector 736 and the second inlet connector 7281 is a quick-connect structure; and the connection between the outlet pipe 75 and the first outlet connector 7182, the third outlet connector 737 and the second outlet connector 7282 is a quick-connect structure. The quick-connect structure can be a snap-fit ​​connection, a threaded connection, etc., improving assembly efficiency and facilitating subsequent centralized maintenance. The inlet pipe 74, outlet pipe 75, supply pipe 76 and return pipe 77 can be metal pipes or non-metal pipes; this application does not limit this.

[0086] In some embodiments, referring to Figures 4 to 7 and Figure 12, the second surface 111b of the protrusion 111 is sloping. Referring to Figures 4 and 14 to 20, the first protruding ring 717 in the first current collector 71 and the second protruding ring 727 in the second current collector 72 are both inclined to adapt to the second surface 111b of the protrusion 111, thereby improving the space utilization in the third direction Z while ensuring the smooth discharge of thermal runaway gas.

[0087] In some embodiments, referring to Figures 2-3 and Figures 21-22, the battery pack 1 further includes a bus assembly 80 and a signal acquisition unit 81. The bus assembly 80 and the signal acquisition unit 81 constitute a CCS assembly.

[0088] Referring to Figures 2-3, the bus assembly 80 is disposed at the end of the battery cell 30 facing away from the bracket 20 in the third direction Z. Referring to Figure 21, the signal acquisition element 81 is disposed on the side of the bus assembly 80 facing away from the battery cell 30 in the third direction Z. Referring to Figure 23, a terminal 32 is disposed at the end of the battery cell 30 facing away from the bracket 20 in the third direction Z. The terminal 32 includes a positive terminal 321 and a negative terminal 322, with the negative terminal 322 surrounding the positive terminal 321 in the circumferential direction. Referring to Figure 21, one end of the signal acquisition element 81 in the first direction X is bent towards the battery cell 30 to form a first bent portion 811.

[0089] In some embodiments, the signal acquisition element 81 is a flexible printed circuit board (FPC) used to acquire voltage and temperature data of the bus assembly 80.

[0090] Referring to Figures 21 and 22, the bus assembly 80 includes a bus 82, a first output bus 83, a second output bus 84, and a connecting piece 85.

[0091] Busbar 82 is used for electrical connection with battery cell 30. Referring to Figure 22, busbar 82 includes a first connection end 821 and a second connection end 822 disposed opposite to each other along a first direction X. The first connection end 821 is used for electrical connection with the positive terminal 321 of battery cell 30, and the second connection end 822 is used for electrical connection with the negative terminal 322 of battery cell 30. Specifically, the first connection end 821 is soldered to the positive terminal 321, and the second connection end 822 is soldered to the negative terminal 322, thereby realizing circuit conduction with battery cell 30.

[0092] Referring to Figure 22, the first output row 83 is disposed on the 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 electrically connect to the positive terminal 321 of the adjacent battery cell 30. The side of the first output row 83 away from the second connection end 822 in the first direction X is bent toward the direction of the battery cell 30 to form a second bent portion 832.

[0093] Referring to Figure 22, the second output row 84 is disposed on the side of the busbar 82 facing away from the first output row 83 in the first direction X. Along the first direction X, the second output row 84 is provided with a second output terminal 841 at one end adjacent to the busbar 82. The second output terminal 841 is used to electrically connect to the negative terminal 322 of the adjacent battery cell 30.

[0094] The signal acquisition component 81 has a window at one end corresponding to the terminal 32 of the battery cell 30 on the third direction Z. The signal acquisition component 81 has multiple direct-soldering areas, which are in direct contact with the busbar 82. It is connected to the busbar 82, the first output busbar 83, and the second output busbar 84 via ultrasonic welding, enabling voltage acquisition of the busbar 82, the first output busbar 83, and the second output busbar 84, i.e., voltage acquisition and monitoring of the battery cell 30. Additionally, the signal acquisition component 81 has at least one temperature acquisition branch, on which at least one temperature sensor is arranged. This temperature acquisition branch is connected to the battery cell 30 below via thermally conductive adhesive, thermally conductive pads, etc., enabling temperature acquisition and monitoring of the battery cell 30. The busbar 82, the first output busbar 83, and the second output busbar 84 are all aluminum busbars.

[0095] Referring to Figure 22, the connecting piece 85 and the second bent portion 832 are stacked along the first direction X. Specifically, the connecting piece 85 and the second bent portion 832 are stacked on the side facing the battery cell 30 in the first direction X. Referring to Figure 21, along the first direction X, the first bent portion 811 of the signal acquisition component 81 and the second bent portion 832 of the first output row 83 are stacked on the side facing away from the connecting piece 85. The adjacent ends of two adjacent connecting pieces 85 along the second direction Y are connected to each other. The stacked structure of the connecting piece 85 and the second bent portion 832 increases the structural strength and overcurrent capacity of the first output row 83, thereby improving the safety of the battery pack 1. The bent structure design of the second bent portion 832 improves the space utilization of the CCS module and the battery pack 1.

[0096] Referring to Figure 21, the battery pack 1 also includes a connector 87, which includes a mounting plate 871 and a socket 872. The mounting plate 871 is disposed on the side of the first bend 811 facing away from the second bend 832 in the first direction X, and the socket 872 is disposed on the side of the mounting plate 871 facing away from the first bend 811 in the first direction X. The structural design of the first bend 811 can improve the space utilization of the CCS component in the third direction Z. The signal acquisition unit 81 is connected to an external temperature acquisition device through the socket 872 of the connector 87 and an external wiring harness connector.

[0097] In some embodiments, referring to FIG21, the battery pack 1 further includes an insulating layer 86, on which an opening 860 is formed extending along the third direction Z through the insulating layer 86. Specifically, in the embodiment shown in FIG21, the insulating layer 86 includes a first insulating layer 861 and a second insulating layer 862. The first insulating layer 861 is disposed on the side of the signal acquisition unit 81 facing away from the busbar 82 in the third direction Z, and the second insulating layer 862 is disposed on the side of the busbar 82 facing away from the signal acquisition unit 81 in the third direction Z. The first insulating layer 861 and the second insulating layer 862 are respectively thermo-pressed films.

[0098] In some embodiments, referring to Figures 1 and 2, the battery pack 1 further includes a cover plate 90 and a bottom plate 91. The cover plate 90 covers a first opening 131 on a first wall 13 of the housing 10, and the bottom plate 91 covers a second opening (not shown) on a second wall 14 to form a seal on the housing 10. A bracket 20 is disposed on the bottom plate 91.

[0099] In some embodiments, the cover plate 90 is composed of a high-strength steel plate and a fiber-reinforced plate. The high-strength steel plate faces the signal acquisition component 81 in the Z-direction, while the fiber-reinforced plate faces away from the signal acquisition component 81 in the Z-direction. The fiber-reinforced plate can protect the cover plate 90 from external damage or corrosion from harsh environments for a long time, ensuring the reliability of the battery pack 1.

[0100] In some embodiments, the base plate 91 is composed of a high-strength steel plate and a fiber-reinforced plate. The high-strength steel plate is oriented towards the support 20 in the Z direction, while the fiber-reinforced plate is oriented away from the support 20 in the Z direction. The fiber-reinforced plate can provide long-term protection against external damage or corrosion from harsh environments, ensuring the reliability of the battery pack 1.

[0101] In some embodiments, referring to FIG2, the battery pack 1 further includes a BMS module 92 and a BUD module 93. Referring to FIG1, FIG3 and FIG5, a mounting frame is provided on the second side wall 12 of the housing 10 of the battery pack 1, and the BMS module 92 and the BUD module 93 are disposed in the mounting frame.

[0102] In summary, this application provides a battery pack and an electrical device having the battery pack. The battery pack 1 has a first flow guiding cavity 110 inside the first side wall 11, a support 20 inside the receiving cavity 101 of the housing 10, a second flow guiding cavity 201 inside the support 20, a protrusion 111 on the side of the first side wall 11 facing the battery cell 30, and a third flow guiding cavity 112 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, so that the second flow guiding cavity 201 is connected to the first flow guiding cavity 110 through the third flow guiding cavity 112. The battery cell 30 is stacked with the bracket 20. The bracket 20 has a first through hole 22 on the support surface facing the battery cell 30, which communicates with the second guide cavity 201. A first explosion-proof valve 31 is provided at one end of the battery cell 30 near the support surface 21. The first explosion-proof valve 31 is positioned opposite to the first through hole 22. A second explosion-proof valve 40 is provided on the first side wall 11. When the battery cell 30 experiences thermal runaway, the generated thermal runaway gas is discharged through the first explosion-proof valve 31. The discharged thermal runaway gas enters the second guide cavity 201 through the first through hole 22, then enters the first guide cavity 110 through the third guide cavity 112, and is discharged to the outside of the housing 10 through the second explosion-proof valve 40. The third guide cavity 112 inside the protrusion 111 can guide and accumulate the thermal runaway gas inside the bracket 20 to the first guide cavity 110 inside the first side wall 11, thereby preventing the thermal runaway gas from accumulating inside the housing 10. This ensures that the thermal runaway gas generated when the battery cell 30 experiences thermal runaway can be discharged to the outside of the housing 10 in a timely and smooth manner, improving the safety of the battery cell 30 and thus ensuring the safety of the battery pack 1.

[0103] The technical solutions provided by the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack having a first direction and a third direction which are perpendicular, wherein, The battery pack includes: The box has an internal cavity, and the box includes a first sidewall, the interior of which is provided with a first flow guide cavity. A support is disposed in the receiving cavity, and a second flow guiding cavity is provided inside the support; A battery cell is disposed in the receiving cavity. Along the third direction, the battery cell is stacked with the bracket. The bracket has a support surface facing the battery cell. A first through hole communicating with the second flow guide cavity is opened on the support surface. A first explosion-proof valve is provided at one end of the battery cell adjacent to the support surface. The first explosion-proof valve is disposed opposite to the first through hole. The second explosion-proof valve is located on the first side wall, and the air inlet of the second explosion-proof valve is connected to the first guide cavity; A protrusion is provided on the side of the first sidewall facing the battery cell, protruding along the first direction. The protrusion has a third flow guiding cavity inside, which is connected to the first flow guiding cavity and the second flow guiding cavity.

2. The battery pack of claim 1, wherein, In the first direction, one end of the bracket adjacent to the protrusion is stacked with the protrusion along the third direction, and the second flow guide cavity is in communication with the third flow guide cavity.

3. The battery pack of claim 2, wherein, The protrusion includes a first surface and a second surface disposed opposite to each other along the third direction, wherein the first surface and the supporting surface are stacked along the third direction; Along the first direction, a second through hole is provided at one end of the support surface adjacent to the protrusion, and a third through hole is provided on the first surface. 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 and the third guide cavity. Along the first direction, a protrusion is provided at one end of the support surface adjacent to the protrusion, and a fourth through hole is provided on the first surface, with the protrusion inserted into the fourth through hole.

4. The battery pack of claim 3, wherein, The battery pack further includes a second buffer member, which is disposed at the location where the second through hole is opened on the support surface, and the second buffer member surrounds the second through hole in the circumferential direction.

5. The battery pack of claim 3, wherein, A fifth through hole is provided on the second surface, and a sixth through hole is provided on the side of the first sidewall facing the battery cell in the first direction. The fifth through hole and the sixth through hole are connected.

6. The battery pack of claim 5, wherein, The first sidewall has a cover plate on the side facing the battery cell in the first direction, and the cover plate covers the connection between the fifth through hole and the sixth through hole.

7. The battery pack of claim 1, wherein, The battery pack also has a second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; The support includes at least one stiffener disposed in the second flow guiding cavity. The stiffener extends along the first direction to divide the second flow guiding cavity into at least two flow guiding channels spaced apart along the second direction. The at least two flow guiding channels are in communication with both the first flow guiding cavity and the third flow guiding cavity.

8. The battery pack of claim 1, wherein, The battery pack also includes a fireproof plate, which is disposed between the battery cell and the bracket; The fireproof board is configured to be ruptured by the thermal runaway gas generated by the battery cell under a preset pressure.

9. The battery pack of claim 8, wherein, The battery pack also includes a first buffer member, which is disposed on the side of the fireproof plate facing away from the bracket in the third direction. The first buffer member corresponds to the area where the first through hole is opened on the support surface. The first buffer member has an exhaust hole that passes through the first buffer member in the third direction. The exhaust hole and the first through hole on the bracket are disposed opposite to each other in the third direction.

10. The battery pack of claim 1, wherein, The battery pack also has a second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; The battery pack also includes: Multiple liquid cooling plates are disposed in the receiving cavity. The multiple liquid cooling plates are spaced apart along the second direction. Each liquid cooling plate includes a first end and a second end that are disposed opposite to each other along the first direction. The liquid cooling plate has a flow channel inside. The multiple liquid cooling plates include a first liquid cooling plate, a second liquid cooling plate, and multiple third liquid cooling plates. At least one battery cell is disposed between two adjacent liquid cooling plates along the second direction. The first current collector is disposed at the first end of the first liquid cooling plate. The first current collector is provided with a first liquid inlet chamber, a first liquid outlet chamber and a liquid supply chamber. The first liquid inlet chamber and the first liquid outlet chamber are spaced apart and respectively communicate with the flow channel. The liquid supply chamber is communicated with the first liquid inlet chamber and spaced apart from the first liquid outlet chamber. The second current collector is disposed at the first end of the second liquid cooling plate. The second current collector is provided with a second liquid inlet chamber, a second liquid outlet chamber and a liquid return chamber. The second liquid inlet chamber and the second liquid outlet chamber are spaced apart and respectively communicate with the flow channel. The liquid return chamber is communicated with the second liquid outlet chamber and is spaced apart from the second liquid inlet chamber. The third manifold is disposed at the first end of the third liquid cooling plate. The third manifold has a third liquid inlet chamber and a third liquid outlet chamber inside. The third liquid inlet chamber and the third liquid outlet chamber are spaced apart and are respectively connected to the flow channel. 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 also connected.

11. The battery pack of claim 10, wherein, The first liquid cooling plate and the second liquid cooling plate are spaced apart along the second direction, and a plurality of third liquid cooling plates are spaced apart between the first liquid cooling plate and the second liquid cooling plate along the second direction; The first liquid inlet chamber, the second liquid inlet chamber, and the third liquid inlet chamber are connected along the second direction; The first liquid outlet chamber, the second liquid outlet chamber, and the third liquid outlet chamber are connected along the second direction.

12. The battery pack of claim 1, wherein, The battery pack also includes a bus assembly and a signal acquisition device; The bus assembly is disposed at the end of the battery cell facing away from the bracket on the third side, the signal acquisition device is disposed on the side of the bus assembly facing away from the battery cell on the third side, and the battery cell is provided with a terminal at the end of the battery cell facing away from the bracket on the third side; The signal acquisition component is bent at one end in the first direction toward the direction of the battery cell to form a first bending portion; The bus assembly includes: The bus includes a first connection end and a second connection end disposed opposite to each other along the first direction; A first output row is disposed on the side of the second connection terminal away from the first connection terminal in the first direction. Along the first direction, a first output terminal is disposed on the side of the first output row adjacent to the second connection terminal. The side of the first output row away from the second connection terminal is bent towards the battery cell to form a second bend. The second output bus is disposed on the side of the bus away from the first output bus in the first direction, and the second output terminal is disposed on the side of the second output bus adjacent to the first connection terminal along the first direction; A connecting piece, wherein the connecting piece and the second bent portion are stacked along the first direction; Along the first direction, the first bend is disposed on the side of the connecting piece opposite to the second bend.

13. The battery pack of claim 12, wherein, The battery pack further includes at least one insulating layer disposed between the busbar and the battery cell, and the insulating layer has an opening through which the terminal is exposed.

14. The battery pack of claim 13, wherein, The insulating layer includes a first insulating layer and a second insulating layer. The first insulating layer is disposed on the side of the signal acquisition device facing away from the bus in the third direction, and the second insulating layer is disposed on the side of the bus facing away from the signal acquisition device in the third direction.

15. An electrical appliance, wherein, Includes the battery pack as described in any one of claims 1 to 14.

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