Battery pack and electric device

Abstract

According to the battery pack, a first channel is formed in a side plate, a pipeline is arranged in a box body, an anti-explosion valve is arranged on a single battery in a protruding mode, a second channel is formed in the anti-explosion valve, the inlet end of the pipeline is connected with the anti-explosion valve, the outlet end of the pipeline is communicated with the first channel, and a pressure release valve is arranged on the side plate; the pressure release valve is connected with one end, deviating from the single battery body, of the first channel, so that when the single battery body is subjected to thermal runaway, gas generated by thermal runaway and electrolyte or other jets carried by the gas can be discharged to the pipeline through the second channel of the anti-explosion valve, and then the gas and the electrolyte or other jets are converged and discharged to the first channel through the pipeline; the thermal runaway gas and the jetted matter in the first channel are discharged to the outer side of the box body through the pressure release valve, so that the gas and the jetted matter generated by thermal runaway of the battery monomers are guided to be discharged, the jetted matter is prevented from splashing to other battery monomers to cause thermal diffusion, the use safety of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and an electric device. Background Art

[0002] During the cycle of battery pack, if overcharge, over-discharge or short-circuit occurs, the battery cells inside the battery pack will experience thermal runaway. The thermal runaway gas generated by the secondary battery in thermal runaway will endanger the safe use of the battery pack. The explosion-proof valve on the battery cell can release the thermal runaway gas. However, the explosion-proof valve on the battery cell in the existing battery pack only discharges the thermal runaway gas, and lacks guidance for the discharged thermal runaway gas, resulting in the thermal runaway gas and the electrolyte and other ejected materials short-circuiting with other electrical components inside the battery pack, affecting the service life and 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 the explosion-proof valve on the battery cell in the current battery pack lacks guidance when discharging thermal runaway gas, resulting in a decrease in the service life and safety of the battery pack.

[0004] A first aspect of an embodiment of the present application provides 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 receiving cavity being provided in the box body, the box body comprising two side plates arranged opposite to each other along the first direction, at least one of the side plates having a first channel therein; a battery cell arranged in the receiving cavity, the battery cell having a first surface and a second surface arranged opposite to each other along the third direction, the battery cell comprising an explosion-proof valve, the explosion-proof valve being protruding from the first surface along the third direction, the explosion-proof valve being provided with a second extending through the explosion-proof valve along the third direction A channel; a pipe, arranged in the accommodating cavity, the pipe comprising an inlet end and an outlet end that are connected to each other, the inlet end is connected to the explosion-proof valve, the gas and / or liquid generated by the battery cell can be discharged to the pipe through the second channel, and the outlet end is connected to the first channel to discharge the gas and / or liquid in the pipe to the first channel; a pressure relief valve, arranged on the side plate provided with the first channel, the pressure relief valve is connected to one end of the first channel away from the battery cell, and the pressure relief valve can discharge the gas and / or liquid entering the first channel to the outside of the box body.

[0005] Optionally, the pipeline includes a main pipe and branch pipes; the main pipe extends along the first direction, at least one of the two opposite ends of the main pipe in the first direction is the outlet end, and the main pipe is inserted into the side plate provided with the first channel; the branch pipes extend along the third direction, each branch pipe includes a plug-in end and a connection end which are oppositely arranged along the third direction, the plug-in end is inserted into the side wall of the main pipe to communicate the branch pipe with the main pipe, and the connection end is connected to the explosion-proof valve to communicate the branch pipe with the second channel.

[0006] Optionally, the two side plates include a first side plate and a second side plate, the first channel is arranged in the first side plate, and the pressure relief valve is arranged on the first side plate; the main pipe includes a first end and a second end which are oppositely arranged along the first direction, the first end is inserted into the first side plate as the outlet end and is communicated with the first channel, and the second end is closed.

[0007] Optionally, the number of the battery cells is multiple, and the multiple battery cells are arranged at intervals along the first direction to form a battery pack; the pipeline includes one main pipe and multiple branch pipes, the number of the branch pipes corresponds to that of the battery cells one by one, and the multiple branch pipes are respectively communicated with the main pipe.

[0008] Optionally, the main pipe includes a first end and a second end which are oppositely arranged along the first direction; along the first direction, there is a first distance between the first end and the adjacent branch pipe, and / or there is a second distance between the second end and the adjacent branch pipe.

[0009] Optionally, the battery pack further has a second direction, and the first direction, the second direction and the third direction intersect pairwise; the first channel extends along the second direction; the number of the battery packs is multiple, and the multiple battery packs are arranged at intervals along the second direction in the accommodation cavity; the number of the main pipes corresponds to that of the battery packs one by one, and the first ends of the multiple main pipes are respectively communicated with the first channel.

[0010] Optionally, the main pipe includes a first wall and a second wall which are oppositely arranged along the third direction, and the plug-in end is inserted into the first wall; the plug-in end extends into the inner side of the main pipe to communicate the branch pipe with the main pipe, and along the third direction, there is a third distance between the end face of the plug-in end extending into the inner side of the main pipe and the first wall; alternatively, a recessed portion is provided on the first wall, the recessed portion is recessed along the third direction, and the recessed portion is provided with a socket, and the plug-in end is inserted into the socket to communicate the branch pipe with the main pipe.

[0011] Optionally, the battery pack further includes a connecting piece, in which a third channel is provided that runs through the connecting piece along the third direction; the connecting piece is sleeved on the explosion-proof valve through the third channel, the connecting end of the branch pipe is inserted into the third channel, and the branch pipe is connected to the explosion-proof valve through the connecting piece.

[0012] Optionally, the connecting end is provided with a protrusion, which surrounds the connecting end along the circumferential direction of the branch pipe; the connecting end is inserted into the third channel, the protrusion abuts against an end of the explosion-proof valve facing away from the first surface in the third direction, and / or the protrusion abuts against the inner wall surface of the connecting piece.

[0013] Optionally, a limiting portion is provided at one end of the connecting member facing away from the first surface in the third direction, the limiting portion surrounds the branch pipe 32 along the circumferential direction of the branch pipe, and the limiting portion is inscribed in the connecting member; a gap exists between the protruding portion and the limiting portion in the third direction.

[0014] Optionally, the connecting piece is threadedly connected to the explosion-proof valve; or, the connecting piece is snap-connected to the explosion-proof valve.

[0015] Optionally, the box body also includes a third side panel and a fourth side panel arranged opposite to each other along the third direction, and the first surface is adjacent to the third side panel in the third direction; and a receiving groove is provided at one end of the first channel facing away from the third side panel in the third direction to accommodate liquid entering the first channel.

[0016] A second aspect of an embodiment of the present application provides an electrical device, comprising the battery pack as described above.

[0017] In summary, the embodiments of the present application provide a battery pack and an electrical device having the battery pack. The battery pack is provided with a first channel in a side panel, a pipe in a receiving cavity of a box body, an explosion-proof valve is protrudingly provided on a first surface of a battery cell, a second channel is provided in the explosion-proof valve, an inlet end of the pipe is connected to the explosion-proof valve on the battery cell, and an outlet end of the pipe is connected to the first channel to connect the pipe with the first channel, and a pressure relief valve is provided on the side panel, the pressure relief valve is connected to an end of the first channel away from the battery cell, so that when thermal runaway occurs in the battery cell, the gas generated by the thermal runaway and the electrolyte carried by the gas can be discharged to the pipe through the second channel of the explosion-proof valve, and then discharged to the first channel through the pipe confluence, and the thermal runaway gas and ejecta in the first channel are discharged to the outside of the box body through the pressure relief valve, thereby forming a guide for the discharge of the gas and ejecta generated by the thermal runaway of the battery cell, preventing the ejected ejecta from splashing to other battery cells to cause heat diffusion, and improving the safety and service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the battery pack provided by the embodiment of the present application;

[0020] Figure 2 It is a schematic structural diagram of the battery pack provided by the embodiment of the present application after removing the cover plate;

[0021] Figure 3 It is Figure 2 The first cross-sectional structural diagram in the A-A direction of

[0022] Figure 4 It is Figure 2 The second cross-sectional structural diagram in the A-A direction of

[0023] Figure 5 It is a schematic combined structural diagram of the battery pack and the pipeline provided by the embodiment of the present application;

[0024] Figure 6 It is Figure 5 The front view of

[0025] Figure 7 It is Figure 5 The cross-sectional view in the B-B direction of

[0026] Figure 8 It is Figure 7 The enlarged structural diagram at C of

[0027] Figure 9 It is Figure 5 The structural diagram after removing the pipeline in

[0028] Figure 10 It is a schematic structural diagram of the pipeline in the battery pack provided by the embodiment of the present application;

[0029] Figure 11 It is Figure 10 The cross-sectional view in the D-D direction of

[0030] Figure 12 It is Figure 10 The enlarged structural diagram at E of

[0031] Figure 13 It is a schematic diagram of the flow direction of gas and / or liquid in the battery pack provided by the embodiment of the present application;

[0032] Figure 14It is a schematic structural diagram of a battery cell in the battery pack provided by an embodiment of the present application.

[0033] Main reference numerals description:

[0034] 100, battery pack;

[0035] 10, box body, 101, accommodation cavity, 1011, first chamber, 1012, second chamber, 11, side plate, 111, first channel, 1111, accommodation groove, 11a, first side plate, 11b, second side plate, 11c, third side plate, 11d, fourth side plate, 13, opening, 14, top cover, 15, partition;

[0036] 20, battery cell, 200, battery pack, 201, first surface, 202, second surface, 203, third surface, 204, fourth surface, 205, fifth surface, 206, sixth surface, 21, explosion-proof valve, 211, second channel, 212, first clamping end, 213, second clamping end, 214, clamping portion, 22, housing, 23, top cover plate, 24, positive electrode post, 25, negative electrode post, 26, filter screen;

[0037] 30, pipeline, 301, inlet end, 302, outlet end, 31, main pipe, 31a, first end, 31b, second end, 311, first wall, 3111, recessed portion, 3112, socket, 312, second wall, 32, branch pipe, 3201, first spacing, 3202, second spacing, 3203, third spacing, 321, plugging end, 322, connection end, 323, protruding portion;

[0038] 40, pressure relief valve;

[0039] 50, connecting piece, 501, third channel, 51, limiting portion, 52, gap;

[0040] 60, battery management unit, 61, first plug-in part, 62, second plug-in part;

[0041] X, first direction, Y, second direction, Z, third direction. Detailed implementation manners

[0042] In order to make the objectives, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be understood that the specific implementation manners described in this specification are only for explaining the present application and not for limiting the present application.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0044] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0046] In the embodiments of the application, "parallel" means the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distance or equal angle means the state where the tolerance range is -1% to 1%.

[0047] This embodiment provides an electrical device, including a battery pack 100, and the battery pack 100 serves as the power supply for the electrical device. The electrical device can be, but is not limited to, a mobile device (such as a mobile phone, 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.

[0048] In some embodiments of the present application, a battery pack 100 is provided. Referring to Figures 1 to 14 , the battery pack 100 includes: a box body 10, battery cells 20, a pipeline 30, and a pressure relief valve 40. The battery pack 100 has a first direction X, a second direction Y, and a third direction Z that intersect pairwise. Specifically, in the embodiment shown in Figures 1 to 13 , the first direction X, the second direction Y, and the third direction Z are pairwise orthogonal.

[0049] Referring to Figures 1 to 4 and Figure 13 , an accommodation cavity 101 is provided inside the box body 10. The box body 10 includes two side plates 11 disposed opposite to each other along the first direction X. Specifically, in the embodiment shown in Figures 1 to 4 and Figure 13 , the two side plates 11 include a first side plate 11a and a second side plate 11b. A first channel 111 is provided inside the first side plate 11a, and the first channel 111 extends along the second direction Y inside the first side plate 11a.

[0050] Referring to Figures 2 to 9 and Figure 14 , the battery cells 20 are disposed in the accommodation cavity 101 of the box body 10. Referring to Figure 14 , the battery cells 20 have a first surface 201 and a second surface 202 disposed opposite to each other along the third direction Z, a third surface 203 and a fourth surface 204 disposed opposite to each other along the second direction Y, and a fifth surface 205 and a sixth surface 206 disposed opposite to each other along the first direction X. The third surface 203, the fifth surface 205, the fourth surface 204, and the sixth surface 206 are sequentially connected end to end to enclose a shell with both ends open. The first surface 201 and the second surface 202 respectively cover the two open ends to form a hexahedron. The third surface 203 and the fourth surface 204 are the surfaces with the largest surface area of the battery cell 20. Referring to Figures 3 to 4 , Figures 7 to 8 and Figure 14 , the battery cell 20 includes an explosion-proof valve 21, and the explosion-proof valve 21 protrudes from the first surface 201. Referring to Figure 8 , a second channel 211 extending along the third direction Z is provided inside the explosion-proof valve 21.

[0051] Referring to Figures 2 to 13 , the pipeline 30 is disposed in the accommodation cavity 101 of the box body 10. Referring toFigures 5 to 12 The pipeline 30 includes an inlet end 301 and an outlet end 302 connected to each other. Figure 8 The inlet end 301 of the pipeline 30 is connected to the explosion-proof valve 21 on the battery cell 20. The gas and / or liquid generated by the battery cell 20 during the cycle can be discharged to the pipeline 30 through the second channel 211 in the explosion-proof valve 21 and the inlet end 301. Figures 3 to 4 as well as Figure 13 The outlet end 302 of the pipeline 30 is connected to the first channel 111 in the first side plate 11a, and the gas and / or liquid discharged into the pipeline 30 can be discharged into the first channel 111 through the outlet end 302, wherein a diaphragm (not shown in the figure) is provided in the second channel 211 of the explosion-proof valve 21, and the battery cell 20 is in a normal working state, and the diaphragm can seal the second channel 211, and when the battery cell 20 has a thermal runaway and reaches a preset pressure, the diaphragm can be broken by the thermal runaway gas to conduct the second channel 211, so that the explosion-proof valve 21 can be opened at a preset pressure, and the preset opening pressure of the explosion-proof valve 21 is reached, and the gas and / or liquid generated by the battery cell 20 can be discharged into the pipeline 30 through the second channel 211 in the explosion-proof valve 21.

[0052] Reference Figures 1 to 4 as well as Figure 13 The pressure relief valve 40 is disposed on the side plate 11 provided with the first channel 111, as shown in FIG. Figures 1 to 4 as well as Figure 13 In the illustrated embodiment, the first channel 111 is disposed on the first side plate 11a, and the pressure relief valve 40 is connected to an end of the first channel 111 away from the battery cell 20, and the pressure relief valve 40 can discharge the gas and / or liquid entering the first channel 111 to the outside of the box body 10. Specifically, the pressure relief valve 40 includes an inlet and an outlet arranged relatively to each other, and the inlet is connected to an end of the first channel 111 away from the battery cell 20 in the first direction X. The pressure relief valve 40 can be opened at a preset pressure (that is, the inlet and the outlet are connected) to discharge the gas and / or liquid in the first channel 111 to the outside of the box body 10.

[0053] During the cycle process, if the secondary batteries in the battery pack are overcharged, over-discharged, or short-circuited with other secondary batteries and / or electrical devices, the secondary batteries will cause thermal runaway. When the secondary batteries in the existing battery packs experience thermal runaway, the explosion-proof valves on the secondary batteries simply release the thermal runaway gases generated by the secondary batteries. There is a lack of guidance for the thermal runaway gases, which causes the electrolyte, block ejecta and other substances carried in the discharged thermal runaway gases to contact with other secondary batteries in the battery pack, causing a short circuit, which in turn causes the speed of heat diffusion to increase. In addition, the electrolyte, block ejecta and other substances carried by the thermal runaway gases come into contact with other electrical devices, causing damage and / or short circuit to the electrical devices, thereby affecting the service life of the secondary batteries and the safe use of electrical devices.

[0054] The battery pack 100 provided in the embodiment of the present application is provided with a first channel 111 in the first side plate 11a of the box body 10, and a pipe 30 is provided in the accommodating chamber 101 of the box body 10, the inlet end 301 of the pipe 30 is connected to the explosion-proof valve 21 on the battery cell 20, and a second channel 211 is provided inside the explosion-proof valve 21, the outlet end 302 of the pipe 30 is connected to the first channel 111, and a pressure relief valve 40 is provided on the first side plate 11a, and the pressure relief valve 40 and the first channel 111 are away from the battery. One end of the single cell 20 is connected. If the battery single cell 20 in the battery pack 100 is overcharged or over-discharged during the cycle operation, or is short-circuited with other battery single cells 20 and / or electrical components in the battery pack 100, thermal runaway of the battery single cell 20 will be generated in a short time. A large amount of thermal runaway gas will be generated inside the thermal runaway battery single cell 20. When the generated thermal runaway gas accumulates to a certain extent, it will break through the diaphragm in the second channel 211 of the explosion-proof valve 21 to open the second channel 211. The thermal runaway gas The thermal runaway gas and the electrolyte and other ejections carried by it enter the pipe 30 through the second channel 211, and due to the high pressure of the thermal runaway gas, the thermal runaway gas and the electrolyte and other ejections carried by it in the pipe 30 enter the first channel 111 through the outlet end 302, and the pressure of the thermal runaway gas entering the first channel 111 reaches the preset pressure required for the pressure relief valve 40 to open. The pressure relief valve 40 opens to discharge the thermal runaway gas and the electrolyte and other ejections carried by it in the first channel 111 to the outside of the box body 10, thereby forming a guide for the discharge of the thermal runaway gas and the electrolyte and other ejections carried by it through the second channel 211, the pipe 30, the first channel 111 and the pressure relief valve 40, and the thermal runaway gas and the electrolyte and other ejections carried by it on the wall contact with other battery cells 20, slowing down the speed of heat diffusion caused by thermal runaway, and avoiding the situation that the electrolyte and other ejections carried by the thermal runaway gas contact with the electrical components in the battery pack 100 to cause a short circuit, thereby improving the safety and service life of the battery pack 100.

[0055] In some embodiments, referenceFigure 2 The box body 10 further includes a third side plate 11c and a fourth side plate 11d arranged opposite to each other along the third direction Z. The first surface 201 of the battery cell 20 is adjacent to the third side plate 11c in the third direction Z. Figure 4 A receiving groove 1111 is provided at one end of the first channel 111 away from the third side plate 11c in the third direction Z. The setting of the receiving groove 1111 can form a container for the electrolyte and other ejected substances carried by the thermal runaway gas entering the first channel 111, thereby preventing excessive electrolyte and other ejected substances from being ejected from the pressure relief valve 40 to the outside of the box body 10 to cause damage to the electrical components in the electrical device, thereby improving the safety of the electrical device.

[0056] Optionally, the box body also includes a first end plate and a second end plate arranged opposite to each other along the third direction, and the first surface is adjacent to the first end plate in the third direction; and the first channel is provided with a receiving groove at one end away from the first end plate in the third direction to accommodate liquid entering the first channel.

[0057] In some embodiments, reference Figures 3 to 8 as well as Figures 10 to 12 The pipeline 30 includes a main pipe 31 and a branch pipe 32. The main pipe 31 extends along the first direction X. At least one of the two ends of the main pipe 31 that are oppositely arranged in the first direction X is an outlet end 302 of the pipeline 30. The end of the main pipe 31 that serves as the outlet end 302 is inserted into the side plate 11 of the box body 10 provided with the first channel 111. Figures 3 to 8 as well as Figures 10 to 12 In the embodiment shown, one end of the main pipe 31 in the first direction X is the outlet end 302, and the end is inserted into the first side plate 11a of the box body 10 and communicates with the first channel 111, and the other end of the main pipe 31 in the first direction X is closed. Figures 3 to 8 as well as Figures 10 to 12 The branch pipe 32 extends along the third direction Z, that is, the axial direction of the branch pipe 32 is orthogonal to the axial direction of the main pipe 31. Figure 8 and Figure 12 The branch pipe 32 includes a plug end 321 and a connection end 322 which are arranged opposite to each other along the third direction Z. The plug end 321 is inserted into the side wall of the main pipe 31 to connect the main pipe 31 and the branch pipe 32. Figure 8, the connecting end 322 of the branch pipe 32 serves as the inlet end 301 of the pipeline 30. The connecting end 322 is connected to the explosion-proof valve 21 of the battery cell 20 to communicate the second channel 211 of the branch pipe 32 and the explosion-proof valve 21, so that the second channel 211 is communicated with the main pipe 31 through the branch pipe 32. The structural design of the main pipe 31 and the branch pipe 32 in the pipeline 30 can ensure the connection stability between the pipeline 30 and the explosion-proof valve 21 of the battery cell 20, and can ensure that the thermal runaway gas generated during the thermal runaway of the battery cell 20 can be smoothly discharged into the first channel 111 through the pipeline 30.

[0058] In some embodiments, referring to Figures 5 to 7 and Figures 10 to 11 , the main pipe 31 includes a first end 31a and a second end 31b that are oppositely arranged along the first direction X. The first end 31a serves as the outlet end 302 of the pipeline 30 and is inserted into the first side plate 11a and communicated with the first channel 111. The second end 31b is closed, so that the thermal runaway gas and its carried ejecta such as electrolyte entering the main pipe 31 through the branch pipe 32 can only be discharged from the first end 31a serving as the outlet end 302 into the first channel 111, avoiding the short circuit caused by the contact between the thermal runaway gas and its carried ejecta such as electrolyte and other battery cells 20 or electrical components, and slowing down the diffusion speed of the thermal runaway.

[0059] In some embodiments, referring to Figure 2 and Figure 5 , the number of battery cells 20 in the box body 10 is multiple. The multiple battery cells 20 are arranged at intervals along the first direction X to form a set of battery packs 200. Among the two adjacent battery cells 20 in the same set of battery packs 200, the third surface 203 of one battery cell 20 is adjacent to the fourth surface 204 of the other battery cell 20 along the first direction X. Referring to Figures 3 to 8 and Figures 10 to 12 , the pipeline 30 includes one main pipe 31 and multiple branch pipes 32. The number of pipelines 30 corresponds to the number of groups of the battery packs 200 one by one. The number of branch pipes 32 in each pipeline 30 corresponds to the number of battery cells 20 in each group of battery packs 200 one by one. The multiple branch pipes 32 are respectively communicated with the main pipe 31, so that multiple battery cells 20 can be connected simultaneously through one pipeline 30, improving the space utilization rate inside the box body 10, and when the battery cells 20 in the same set of battery packs 200 undergo thermal runaway, the thermal runaway gas and its carried ejecta such as electrolyte can only be discharged through the pipeline 30 and will not splash onto other battery cells 20 in the same set of battery packs 200, effectively reducing the risk of thermal diffusion.

[0060] In some embodiments, referring to Figure 7 and Figure 11, along the first direction X, there is a first spacing 3201 between the first end 31a of the main pipe 31 and the adjacent branch pipe 32. The first end 31a of the main pipe 31 serves as the outlet end 302 of the pipe 30 and is communicated with the first channel 111 in the first side plate 11a. The setting of the first spacing 3201 between the first end 31a and the adjacent branch pipe 32 can form a guide for the flow of the electrolyte carried by the thermal runaway gas entering the main pipe 31, so that the electrolyte can smoothly enter the first channel 111.

[0061] In some embodiments, referring to Figure 7 and Figure 11 , along the first direction X, there is a second spacing 3202 between the second end 31b of the main pipe 31 and the adjacent branch pipe 32. The second end 31b of the main pipe 31 is closed. The setting of the second spacing 3202 between the second end 31b and the adjacent branch pipe 32 can form a guide and buffer for the flow of the electrolyte carried by the thermal runaway gas entering the main pipe 31 through the branch pipe 32 adjacent to the second end 31b, so that the electrolyte at the end far from the first channel 111 can smoothly enter the first channel 111.

[0062] In some embodiments, referring to Figure 2 , Figure 5 and Figure 9 , the number of battery packs 200 in the box body 10 is multiple. The multiple battery packs 200 are arranged at intervals along the second direction Y in the accommodation cavity 101 of the box body 10. The first channel 111 in the first side plate 11a extends along the second direction Y. The pipes 30 and the battery packs 200 correspond to each other in number. Specifically, the main pipes 31 in the pipes 30 and the battery packs 200 correspond to each other in number. The first ends 31a of the multiple main pipes 31 are respectively communicated with the first channel 111. The combined design of the multiple main pipes 31 and the multiple groups of battery packs 200, and the setting that the multiple main pipes 31 are respectively communicated with the first channel 111, referring to Figure 13 , can form a confluence of the thermal runaway gas generated by the battery cells 20 that have thermal runaway in the battery pack 200 and the ejecta such as the electrolyte carried by the thermal runaway gas through the multiple main pipes 31, so that the thermal runaway gas and the ejecta such as the electrolyte carried by the thermal runaway gas are concentrated and flow into the first channel 111, avoiding the thermal runaway gas and the ejecta such as the electrolyte carried by the thermal runaway gas from splashing onto the battery cells 20 that have not had thermal runaway, effectively delaying the diffusion speed of the thermal runaway, and improving the use safety of the battery pack 100.

[0063] In some embodiments, referring to Figure 8 and Figure 12 , the main pipe 31 includes a first wall 311 and a second wall 312 that are oppositely arranged along the third direction Z. The insertion end 321 of the branch pipe 32 is inserted into the first wall 311, and the insertion end 321 extends into the inside of the main pipe 31 to communicate the branch pipe 32 with the main pipe 31, referring to Figure 8, along the third direction Z, there is a third spacing 3203 between the end face of the insertion end 321 of the branch pipe 32 extending into the inner side end of the main pipe 31 and the first wall 311 of the main pipe 31. The design of the third spacing 3203 enables the insertion end 321 of the branch pipe 32 to extend into the main pipe 31 by a certain distance. As a result, when the thermal runaway gas and its carried ejecta such as electrolyte entering the interior of the main pipe 31 via the branch pipe 32 flow along the main pipe 31, they can be blocked by the third spacing 3203 between the insertion end 321 and the first wall 311, preventing the thermal runaway gas and its carried ejecta such as electrolyte from entering the adjacent battery cells 20 through the adjacent branch pipes 32, thereby effectively reducing the diffusion speed of thermal runaway and enhancing the use safety of the battery pack 100.

[0064] In some embodiments, referring to Figure 8 and Figure 12 , a recess 3111 is provided on the first wall 311 of the main pipe 31. The recess 3111 is recessed in the direction approaching the second wall 312 along the third direction Z. The recess 3111 forms a groove structure on the side of the first wall 311 facing away from the second wall 312. The recess 3111 is provided with an insertion opening 3112. The insertion end 321 of the branch pipe 32 is inserted into the insertion opening 3112 to connect the branch pipe 32 and the main pipe 31. The structural design of the recess 3111 forms a protrusion inside the main pipe 31. As a result, when the thermal runaway gas and its carried ejecta such as electrolyte entering the interior of the main pipe 31 via the branch pipe 32 flow along the main pipe 31, they can be blocked by the protrusion formed by the recess 3111 inside the main pipe 31, preventing the thermal runaway gas and its carried ejecta such as electrolyte from entering the adjacent battery cells 20 through the adjacent branch pipes 32, thereby effectively reducing the diffusion speed of thermal runaway and enhancing the use safety of the battery pack 100.

[0065] In some embodiments, referring to Figures 2 to 9 , the battery pack 100 further includes a connector 50. Referring to Figure 8 , a third channel 501 penetrating the connector 50 along the third direction Z is provided inside the connector 50. The connector 50 is sleeved on the explosion-proof valve 21 of the battery cell 20 through the third channel 501. The connecting end 322 of the branch pipe 32 in the pipe 30 is inserted into the third channel 501. The branch pipe 32 and the explosion-proof valve 21 are connected through the connector 50. The design of the connector 50 can improve the connection stability and firmness between the branch pipe 32 and the explosion-proof valve 21. Moreover, the second channel 211 of the branch pipe 32 and the explosion-proof valve 21 communicate inside the connector 50, preventing the thermal runaway gas and its carried ejecta such as electrolyte generated when the battery cell 20 has a thermal runaway from leaking from the connection between the branch pipe 32 and the explosion-proof valve 21, further reducing the risk of the thermal runaway gas and its carried ejecta such as electrolyte splashing onto the adjacent battery cells 20 and causing thermal runaway, thereby reducing the diffusion speed of thermal runaway.

[0066] In some embodiments, reference Figure 8 and Figure 12 The connecting end 322 of the branch pipe 32 is arranged on the protrusion 323, and the protrusion 323 surrounds the connecting end 322 along the circumferential direction of the branch pipe 32, referring to Figure 8 The connection end 322 is inserted into the third channel 501 of the connector 50, and the protrusion 323 abuts against one end of the explosion-proof valve 21 in the third direction Z away from the first surface 201 of the battery cell 20. The design of the protrusion 323 can further improve the sealing performance of the joint between the branch pipe 32 and the explosion-proof valve 21, thereby preventing the thermal runaway gas and the electrolyte and other ejected materials carried by the thermal runaway gas generated when the battery cell 20 thermally runs away from leaking from the joint between the branch pipe 32 and the explosion-proof valve 21, further reducing the risk of thermal runaway gas and the electrolyte and other ejected materials carried by the thermal runaway gas splashing to the adjacent battery cell 20 to cause thermal runaway, thereby reducing the diffusion rate of thermal runaway.

[0067] In some embodiments, reference Figure 8 The raised portion 323 of the branch pipe 32 abuts against the inner wall surface of the connecting piece 50 , thereby further improving the sealing performance of the connection between the branch pipe 32 and the explosion-proof valve 21 .

[0068] In some embodiments, reference Figure 8 The connector 50 is provided with a limiting portion 51 at one end thereof away from the first surface 201 of the battery cell 20 in the third direction Z. The limiting portion 51 surrounds the branch pipe 32 along the circumferential direction of the branch pipe 32. Figure 8 In the illustrated embodiment, the limiting portion 51 abuts against the outer peripheral wall of the branch pipe 32, the limiting portion is inscribed in the connecting piece 50, and a gap 52 exists between the protrusion 323 and the limiting portion 51 in the third direction Z. The gap 52 is designed to reserve a moving space for the protrusion 323 in the third channel 501. When the battery pack 100 shakes or is hit, causing the battery cell 20 to shake, the branch pipe 32 can shake in the third channel 501 to avoid damage to the branch pipe 32. In addition, the matching design of the limiting portion 51 and the protrusion 323 can limit the movement of the branch pipe 32 in the third channel 501, thereby preventing the branch pipe 32 from being separated from the explosion-proof valve 21, thereby improving the service life and safety of the battery pack 100.

[0069] In some embodiments, reference Figure 8 The connecting piece 50 is threadedly connected to the explosion-proof valve 21. Specifically, a thread is provided on the outer peripheral wall of the explosion-proof valve 21 to form an external thread structure. The connecting piece 50 is a nut matching the size of the explosion-proof valve 21, thereby ensuring the connection stability and firmness between the connecting piece 50 and the explosion-proof valve 21.

[0070] In some embodiments, threads are provided on the inner wall of the explosion-proof valve 21 to form an internal thread structure, and the connector 50 is inserted into the explosion-proof valve 21 and threadedly connected to the explosion-proof valve 21 .

[0071] In some embodiments, the connecting member 50 is snap-connected to the explosion-proof valve 21. Referring to Figure 14 , at opposite ends of the explosion-proof valve 21 in the third direction Z, a first snap-connection end 212 and a second snap-connection end 213 are respectively provided. The first snap-connection end 212 and the second snap-connection end 213 respectively surround the outer peripheral wall of the explosion-proof valve 21 along the circumferential direction of the explosion-proof valve 21. The outer peripheral wall of the explosion-proof valve 21 between the first snap-connection end 212 and the second snap-connection end 213 forms a snap-connection portion 214. The connecting member 50 is sleeved on the explosion-proof valve 21 and is snap-connected to the snap-connection portion 214, thereby realizing the rapid assembly between the connecting member 50 and the explosion-proof valve 21 and improving the assembly efficiency.

[0072] In some embodiments, referring to Figure 14 , the battery cell 20 further includes a filter screen 26. The filter screen 26 is disposed in the second channel 211 of the explosion-proof valve 21. The filter screen 26 is internally connected to the explosion-proof valve 21. When thermal runaway occurs in the battery cell 20, the thermal runaway gas will carry ejecta such as electrolyte and be discharged into the pipeline 30 through the explosion-proof valve 21. However, in addition to the electrolyte in the ejecta, there may also be some blocky ejecta such as pole pieces and tab fragments. The presence of the filter screen 26 can block the relatively large-sized blocky ejecta, preventing the relatively large-sized blocky ejecta from entering the pipeline 30 through the explosion-proof valve 21 and blocking the pipeline 30, ensuring the smooth discharge of the thermal runaway gas, the electrolyte it carries, and the relatively small-sized blocky ejecta, and ensuring the use safety of the battery pack 100.

[0073] Among them, referring to Figure 14 , the battery cell 20 further includes a housing 22, a top cover plate 23, a positive electrode terminal 24, and a negative electrode terminal 25. One end of the housing 22 adjacent to the first surface 201 in the third direction Z is open. The top cover plate 23 covers the opening of the housing 22. The surface of the top cover plate 23 facing away from the housing 22 in the third direction Z forms the first surface 201 of the battery cell 20. The positive electrode terminal 24 and the negative electrode terminal 25 are arranged on the top cover plate 23 at intervals along the first direction X. The explosion-proof valve 21 is disposed between the positive electrode terminal 24 and the negative electrode terminal 25.

[0074] Referring to Figure 1 , the battery pack 100 further includes a top cover 14. Referring to Figure 2 , an opening 13 is formed on the third side plate 11c of the box body 10. The top cover 14 is disposed on the third side plate 11c and covers the opening 13, forming a seal for the opening 13. Referring to Figure 2 and Figure 13 , a partition 15 is provided inside the box body 10. The partition 15 extends along the second direction Y. The partition 15 divides the accommodation cavity 101 into a first cavity 1011 and a second cavity 1012 that are arranged at intervals along the first direction X. The battery cell 20 is disposed in the first cavity 1011. Referring to Figures 2 to 4, the battery pack 100 further includes a battery management unit 60. The battery management unit 60 includes a first connector 61 and a second connector 62. Refer to Figure 2 , the battery management unit 60 is disposed in the second chamber 1012. The first connector 61 and the second connector 62 are spaced apart along the second direction Y on the second side plate 11b. Among them, the first connector 61 is a high-voltage connector, and the second connector 62 is a low-voltage connector.

[0075] The technical solutions provided by the embodiments of the present invention have been introduced in detail above. Specific examples are used herein to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

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), wherein a receiving cavity (101) is provided in the box body (10), the box body (10) comprises two side panels (11) arranged opposite to each other along the first direction (X), and a first channel (111) is provided in at least one of the side panels (11); A battery cell (20) is arranged in the accommodating cavity (101), the battery cell (20) having a first surface (201) and a second surface (202) arranged opposite to each other along the third direction (Z), the battery cell (20) comprising an explosion-proof valve (21), the explosion-proof valve (21) being arranged protruding from the first surface (201) along the third direction (Z), and a second channel (211) extending along the third direction (Z) is arranged in the explosion-proof valve (21); a pipeline (30) disposed in the accommodating cavity (101), the pipeline (30) comprising an inlet end (301) and an outlet end (302) which are connected to each other, the inlet end (301) being connected to the explosion-proof valve (21), the gas and / or liquid generated by the battery cell (20) being able to be discharged to the pipeline (30) through the second channel (211), and the outlet end (302) being connected to the first channel (111) so as to discharge the gas and / or liquid in the pipeline (30) to the first channel (111); A pressure relief valve (40) is arranged on the side plate (11) provided with the first channel (111), the pressure relief valve (40) is connected to an end of the first channel (111) away from the battery cell (20), and the pressure relief valve (40) can discharge gas and / or liquid entering the first channel (111) to the outside of the box body (10).

2. The battery pack according to claim 1, characterized in that: The pipeline (30) includes a main pipe (31) and a branch pipe (32); The main pipe (31) extends along the first direction (X), and at least one of the two opposite ends of the main pipe (31) in the first direction (X) is the outlet end (302), and is inserted into the side plate (11) provided with the first channel (111); The branch pipe (32) extends along the third direction (Z), and the branch pipe (32) comprises a plug end (321) and a connecting end (322) which are arranged opposite to each other along the third direction (Z); the plug end (321) is inserted into a side wall of the main pipe (31) to connect the branch pipe (32) with the main pipe (31), and the connecting end (322) is connected to the explosion-proof valve (21) to connect the branch pipe (32) with the second channel (211).

3. The battery pack according to claim 2, characterized in that: The two side plates (11) include a first side plate (11a) and a second side plate (11b), the first channel (111) is arranged in the first side plate (11a), and the pressure relief valve (40) is arranged on the first side plate (11a); The main pipe (31) comprises a first end (31a) and a second end (31b) which are arranged opposite to each other along the first direction (X); the first end (31a) is inserted into the first side plate (11a) as the outlet end (302) and communicates with the first channel (111); the second end (31b) is closed.

4. The battery pack according to claim 2, characterized in that: The number of the battery cells (20) is plural, and the plurality of battery cells (20) are arranged at intervals along the first direction (X) to form a battery pack (200); The pipeline (30) comprises a main pipe (31) and a plurality of branch pipes (32), the branch pipes (32) corresponding to the battery cells (20) in number, and the plurality of branch pipes (32) are respectively connected to the main pipe (31).

5. The battery pack according to claim 4, characterized in that: The main pipe (31) comprises a first end (31a) and a second end (31b) which are arranged opposite to each other along the first direction (X); Along the first direction (X), there is a first distance (3201) between the first end (31a) and the adjacent branch pipe (32), and / or there is a second distance (3202) between the second end (31b) and the adjacent branch pipe (32).

6. The battery pack according to claim 5, characterized in that: 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 first channel (111) extends along the second direction (Y); There are a plurality of battery packs (200), and the plurality of battery packs (200) are arranged in the accommodating cavity (101) at intervals along the second direction (Y); The number of the main pipes (31) and the number of the battery packs (200) correspond one to one, and the first ends (31a) of the plurality of main pipes (31) are respectively connected to the first channels (111).

7. The battery pack according to claim 2, characterized in that: The main pipe (31) comprises a first wall (311) and a second wall (312) which are arranged opposite to each other along the third direction (Z), and the plug-in end (321) is inserted into the first wall (311); The plug end (321) extends into the inner side of the main pipe (31) to connect the branch pipe (32) with the main pipe (31), and along the third direction (Z), a third distance (3203) exists between the end plate where the plug end (321) extends into the inner side of the main pipe (31) and the first wall (311); Alternatively, a recessed portion (3111) is provided on the first wall (311), the recessed portion (3111) is recessed along the third direction (Z), the recessed portion (3111) is provided with a socket (3112), and the plug end (321) is inserted into the socket (3112) to connect the branch pipe (32) with the main pipe (31).

8. The battery pack according to claim 2, characterized in that: The battery pack further comprises a connecting member (50), wherein a third channel (501) is provided in the connecting member (50) and passes through the connecting member (50) along the third direction (Z); The connecting piece (50) is sleeved on the explosion-proof valve (21) through the third channel (501), the connecting end (322) of the branch pipe (32) is inserted into the third channel (501), and the branch pipe (32) is connected to the explosion-proof valve (21) through the connecting piece (50).

9. The battery pack according to claim 8, characterized in that: The connection end (322) is provided with a protrusion (323), and the protrusion (323) surrounds the connection end (322) along the circumferential direction of the branch pipe (32); The connecting end (322) is inserted into the third channel (501), the protrusion (323) abuts against an end of the explosion-proof valve (21) in the third direction (Z) away from the first surface (201), and / or the protrusion (323) abuts against the inner wall surface of the connecting piece (50).

10. The battery pack according to claim 9, characterized in that: The connecting member (50) is provided with a limiting portion (51) at one end thereof facing away from the first surface (201) in the third direction (Z), the limiting portion (51) surrounds the branch pipe (32) along the circumferential direction of the branch pipe (32), and the limiting portion (51) is inscribed in the connecting member (50); There is a gap (52) between the protruding portion (323) and the limiting portion (51) in the third direction (Z).

11. The battery pack according to claim 8, characterized in that: The connecting piece (50) is threadedly connected to the explosion-proof valve (21); Alternatively, the connecting piece (50) is snap-connected to the explosion-proof valve (21).

12. The battery pack according to claim 1, wherein: The box body (10) further comprises a third side plate (11c) and a fourth side plate (11d) arranged opposite to each other along the third direction (Z), and the first surface (201) is adjacent to the third side plate (11c) in the third direction (Z); An accommodating groove (1111) is provided at one end of the first channel (111) away from the third side plate (11c) in the third direction (Z) to accommodate liquid entering the first channel (111).

13. An electrical device, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 12.

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