Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack has a first direction and a third direction which are intersected, and the battery pack comprises a plurality of battery monomers and an exhaust assembly; each single battery is provided with a pressure relief part, the exhaust assembly comprises an exhaust part and a plurality of shielding parts, the exhaust part is arranged on one side, provided with the pressure relief part, of each single battery, and the exhaust part is connected with the multiple single batteries; the exhaust part is provided with a cavity and a plurality of exhaust holes communicated with the cavity, the plurality of exhaust holes are formed in one side, facing the single battery, of the exhaust part, and the plurality of exhaust holes are formed in the first direction at intervals; in the third direction, the projection of the pressure relief piece on the exhaust part is located in the exhaust hole; the plurality of shielding parts are arranged in the cavity, and each shielding part is hinged to the exhaust part and covers one exhaust hole; the shielding part is configured to be capable of rotating in the direction away from the exhaust hole when the pressure relief piece is started for pressure relief. The exhaust assembly is used for gathering and discharging high-temperature flue gas, damage to other adjacent single batteries is avoided, and the safety of the battery pack is improved.

Description

Technical Field

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

[0002] As the power source of electric vehicles, the safety of battery packs during use directly affects the safety of the entire vehicle. Battery packs usually include multiple battery cells arranged side by side, and thermal runaway of battery cells will produce high-temperature smoke, which will harm other adjacent battery cells, causing damage to multiple battery cells or even battery pack explosion and other more serious consequences, affecting the safety of the battery pack. Utility Model Content

[0003] Purpose of the utility model: An embodiment of the present application provides a battery pack, aiming to solve the problem that high-temperature smoke and molten materials generated by thermal runaway of a single battery cell in the existing system may cause harm to other battery cells, reduce the impact of thermal runaway of a single battery cell, and thus improve the safety of the battery pack; another purpose of an embodiment of the present application is to provide an electrical device.

[0004] Technical solution: A battery pack described in an embodiment of the present application has a first direction and a third direction intersecting each other, includes a plurality of battery cells and an exhaust assembly, wherein the plurality of battery cells are arranged along the first direction; a pressure relief member is provided on one side of the battery cell along the third direction; the exhaust assembly includes an exhaust portion and a plurality of shielding portions, wherein the exhaust portion is arranged on a side of the battery cell along the third direction where the pressure relief member is provided, and the exhaust portion is connected to the plurality of battery cells; the exhaust portion has a cavity and a plurality of exhaust holes connected to the cavity, wherein the plurality of exhaust holes are arranged on a side of the exhaust portion facing the battery cell, and the plurality of exhaust holes are arranged at intervals along the first direction; along the third direction, the orthographic projection of the pressure relief member on the exhaust portion is located within the exhaust hole; a plurality of shielding portions are arranged in the cavity, and each shielding portion is hinged to the exhaust portion and covers one exhaust hole; the shielding portion is configured to be able to rotate in a direction away from the exhaust hole when the pressure relief member is opened to relieve pressure.

[0005] In some embodiments, the exhaust assembly includes a limit member, which is disposed in the cavity and connected to the exhaust portion; at least a portion of the limit member is disposed on a side of the shielding portion away from the exhaust hole, so as to abut against the shielding portion when the shielding portion rotates in a direction away from the exhaust hole.

[0006] In some embodiments, the shielding portion includes:

[0007] A body, arranged along the third direction on a side of the exhaust hole away from the battery cell, and covering the exhaust hole;

[0008] A connecting member is connected to the body, and one end of the connecting member away from the body is hinged to the exhaust portion; at least a part of the limiting member is disposed on a side of the connecting member away from the battery cell to limit the rotation angle of the connecting member.

[0009] In some embodiments, the connecting member is provided with a limiting hole that penetrates the connecting member along the third direction; the limiting member is inserted through the limiting hole, and a part of the limiting member is located on a side of the limiting hole away from the battery cell; when the connecting member rotates in a direction away from the exhaust hole, one end of the limiting member away from the battery cell abuts against the connecting member.

[0010] In some embodiments, the limiting member includes:

[0011] A first section is disposed on the outer peripheral side of the exhaust hole and connected to the exhaust portion; when the body covers the exhaust hole, the first section is connected to the hole wall of the limiting hole by interference fit.

[0012] A second section is connected to a side of the first section away from the exhaust hole along the third direction; when the body is away from the exhaust hole, the second section is inserted through the limiting hole and abuts against the connecting member.

[0013] In some embodiments, the limiting member further includes a transition section, the transition section is disposed between the first section and the second section and is respectively connected to the first section and the second section; along the direction from the first section towards the second section, the outer diameter of the transition section gradually decreases.

[0014] In some embodiments, the exhaust portion includes:

[0015] A first plate body is disposed on one side of the battery cell along the third direction and is attached to the battery cell, and a plurality of the exhaust holes are disposed on the first plate body and penetrate the first plate body along the third direction; the shielding portion is disposed on a side of the first plate body facing away from the battery cell along the third direction, and the shielding portion is hinged to the first plate body; the shielding portion partially fits on the outer peripheral side of the exhaust hole when the pressure relief member is not opened.

[0016] A second plate body is disposed on a side of the shielding portion facing away from the first plate body along the third direction, and the second plate body is connected to the first plate body to enclose the cavity.

[0017] In some embodiments, along the first direction, the first plate body includes a first end and a second end that are oppositely disposed, and the shielding portion is hinged to a side of the exhaust hole close to the first end.

[0018] The exhaust part further includes a baffle plate, which is arranged at the first end and is hermetically connected to the first end and the second plate body respectively. An exhaust port is formed between the second end and the second plate body, and the exhaust port communicates with the cavity.

[0019] In some embodiments, there is a second direction intersecting with the first direction and the third direction respectively. The battery cell includes two electrode terminals arranged at intervals along the second direction, and the pressure relief member is arranged between the two electrode terminals; the exhaust assembly is arranged between the two electrode terminals and connected to the battery cell.

[0020] Correspondingly, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the foregoing embodiments, and the battery pack is used to supply power to the electrical device.

[0021] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of the present application has a first direction and a third direction that intersect, and includes a plurality of battery cells and an exhaust assembly. The plurality of battery cells are arranged along the first direction; a pressure relief member is provided on one side of the battery cell along the third direction. The exhaust assembly includes an exhaust part and a plurality of shielding parts. The exhaust part is arranged along the third direction on the side of the battery cell where the pressure relief member is provided, and the exhaust part is connected to the plurality of battery cells; the exhaust part has a cavity and a plurality of exhaust holes communicating with the cavity. The plurality of exhaust holes are arranged on the side of the exhaust part facing the battery cell, and the plurality of exhaust holes are arranged at intervals along the first direction. Along the third direction, the orthographic projection of the pressure relief member on the exhaust part is located within the exhaust hole; the plurality of shielding parts are arranged in the cavity, and each shielding part is hinged to the exhaust part and covers one exhaust hole; the shielding part is configured to be able to rotate away from the exhaust hole when the pressure relief member is opened for pressure relief. The battery pack of the present application is provided with an exhaust assembly for converging and discharging the high-temperature flue gas of the thermal runaway of the battery cell, avoiding the harm of the high-temperature flue gas to other adjacent battery cells, thereby improving the safety of the battery pack. Among them, the exhaust hole is used to dock with the pressure relief member to receive the high-temperature flue gas when the pressure relief member is opened. The high-temperature flue gas impacts the shielding part and enters the cavity, and the remaining shielding parts cover the corresponding exhaust holes to block the high-temperature flue gas, thereby preventing the high-temperature flue gas from harming other adjacent battery cells, ensuring the safety of the battery cells adjacent to the thermal runaway battery cell, and thus improving the safety of the battery pack.

[0022] Compared with the prior art, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the foregoing embodiments, and the battery pack is used to supply power to the electrical device. It can be understood that the electrical device of the present application includes all the technical features and technical effects of the foregoing battery pack, which will not be elaborated here. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0024] Figure 1 is a schematic diagram of the overall structure of a battery pack according to an embodiment of the present application;

[0025] Figure 2 is a top view of a battery pack according to an embodiment of the present application;

[0026] Figure 3 is a schematic diagram of the overall structure of a battery cell according to an embodiment of the present application;

[0027] Figure 4 is a schematic diagram of the overall structure of an exhaust component according to an embodiment of the present application;

[0028] Figure 5 is an exploded view of the exhaust component according to an embodiment of the present application;

[0029] Figure 6 is Figure 5 an enlarged view of part A in;

[0030] Figure 7 is a side view of the side where the second end of the exhaust component according to an embodiment of the present application is located;

[0031] Figure 8 is a schematic diagram of the connection relationship among the first plate body, the shielding part and the limiting part according to an embodiment of the present application;

[0032] Figure 9 is Figure 8 an enlarged view of part B in;

[0033] Figure 10 is a schematic diagram of the structure of the first plate body and the limiting part according to an embodiment of the present application;

[0034] Figure 11 is a schematic diagram of the overall structure of the shielding part according to an embodiment of the present application;

[0035] Figure 12 is a top view of the shielding part according to an embodiment of the present application;

[0036] Figure 13 is a front view of the limiting part according to an embodiment of the present application;

[0037] Figure 14 is a schematic diagram of the structure after the shielding part is opened according to an embodiment of the present application.

[0038] Reference numerals: 1, battery cell; 11, pressure relief member; 12, electrode terminal; 13, first surface; 2, exhaust assembly; 21, exhaust part; 211, cavity; 212, exhaust hole; 213, first plate body; 2131, first end; 2132, second end; 214, second plate body; 215, baffle; 216, exhaust port; 22, shielding part; 221, main body; 222, connecting member; 2221, limiting hole; 23, limiting member; 231, first section; 232, second section; 233, transition section; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying 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 therefore 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 indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, and "at least one" means one, two or more, unless otherwise specifically defined. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical. For example, within the range of an included angle of 80° to 100°, it is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel. For example, within the range of 10° of complete parallelism, it is considered parallel.

[0041] It should also be noted that in the drawings of the present application, an arrow marked with X indicates the first direction X, an arrow marked with Y indicates the second direction Y, and an arrow marked with Z indicates the third direction Z. The introduction of the first direction X, the second direction Y, and the third direction Z is to facilitate the description of the structural positional relationship of the battery pack, thereby facilitating the understanding of its structure. In the embodiments of the present application, the first direction X is the arrangement direction of the plurality of battery cells 1 and is also the width direction of the battery cell 1; the second direction Y is the length direction of the battery cell 1, that is, the direction in which the two electrode terminals 12 of the battery cell 1 are arranged; the third direction Z is the arrangement direction of the battery cell 1 and the exhaust assembly 2, and the third direction Z is also the height direction of the battery cell 1; and the first direction X, the second direction Y, and the third direction Z intersect with each other. Further, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0042] In the field of electric vehicles, the safety of the battery pack remains a major problem faced by the current industry and is also a major barrier to the development of the industry. In order to continuously improve the safety performance of the battery pack, especially the thermal safety performance, the market has higher and higher requirements for thermal safety, that is, no fire occurs outside the battery pack, and no thermal spread or fire occurs during thermal runaway. To meet the above thermal safety requirements, the thermoelectric separation design has gradually become the industry consensus. To achieve the thermoelectric separation effect, an exhaust channel needs to be specifically designed so that the high-temperature flue gas is discharged outside the battery pack through the designed channel to reduce the harm to other battery cells and components when a certain battery cell undergoes thermal runaway. However, most of the current exhaust channel designs cannot completely isolate the harm of the high-temperature flue gas to other battery cells, that is, during thermal runaway, when the high-temperature flue gas flows through the adjacent battery cells, it may cause damage to its explosion-proof valve and trigger the valve opening (that is, the explosion-proof valve of the battery cell is in a connected state with the smoke exhaust channel), and even trigger its thermal runaway. At this time, the safety of the battery pack still cannot be guaranteed.

[0043] In view of this, the embodiments of the present application provide a battery pack, aiming to solve at least one of the above technical problems.

[0044] Please refer to Figures 1 - 7, a battery pack provided by an embodiment of the present application. The battery pack has an intersecting first direction X and a third direction Z, and the battery pack includes a plurality of battery cells 1 and an exhaust assembly 2. The plurality of battery cells 1 are arranged along the first direction X; a pressure relief member 11 is provided on one side of the battery cell 1 along the third direction Z; the exhaust assembly 2 includes an exhaust portion 21 and a plurality of shielding portions 22. The exhaust portion 21 is arranged along the third direction Z on the side of the battery cell 1 where the pressure relief member 11 is provided, and the exhaust portion 21 is connected to the plurality of battery cells 1; the exhaust portion 21 has a cavity 211 and a plurality of exhaust holes 212 communicating with the cavity 211. The plurality of exhaust holes 212 are provided on the side of the exhaust portion 21 facing the battery cell 1, and the plurality of exhaust holes 212 are spaced along the first direction X; along the third direction Z, the orthographic projection of the pressure relief member 11 on the exhaust portion 21 is located within the exhaust hole 212; the plurality of shielding portions 22 are provided in the cavity 211, and each shielding portion 22 is hinged to the exhaust portion 21 and seals an exhaust hole 212; the shielding portion 22 is configured to be able to rotate in a direction away from the exhaust hole 212 when the pressure relief member 11 is opened for pressure relief.

[0045] The battery pack of the present application sets an exhaust assembly 2 to converge and discharge the high-temperature flue gas of the thermal runaway of the battery cell 1, avoiding the harm of the high-temperature flue gas to other adjacent battery cells 1, thereby improving the safety of the battery pack. Among them, the exhaust hole 212 is used to dock with the pressure relief member 11 to receive the high-temperature flue gas when the pressure relief member 11 is opened. The high-temperature flue gas impacts the shielding portion 22 and enters the cavity 211, and the remaining shielding portions 22 seal the corresponding exhaust holes 212 to block the high-temperature flue gas, thereby preventing the high-temperature flue gas from harming other adjacent battery cells 1, ensuring the safety of the battery cells 1 adjacent to the thermally runaway battery cell 1, and thus improving the safety of the battery pack.

[0046] In the embodiment of the present application, the battery cell 1 includes a first surface 13, and the pressure relief member 11 is disposed on the first surface 13. At this time, the exhaust assembly 2 is connected to the battery cell 1, and the orthographic projection of the pressure relief member 11 on the exhaust portion 21 is located within the exhaust hole 212. Specifically, the exhaust portion 21 may be attached to the first surface 13 of the battery cell 1, and the pressure relief member 11 is exposed from the exhaust hole 212 without being blocked. When the pressure relief member 11 is opened, the inner cavity of the battery cell 1 communicates with the exhaust hole 212, and the high-temperature flue gas generated by the thermal runaway of the battery cell 1 is ejected from the inner cavity of the battery cell 1 and enters the exhaust hole 212. After the pressure relief member 11 is opened, the high pressure of the pressure relief member 11 and the high-temperature flue gas pass through the exhaust hole 212 and act on the shielding portion 22, causing the shielding portion 22 to rotate around the hinge joint with the exhaust portion 21, so that the exhaust hole 212 communicates with the cavity 211, thereby enabling the high-temperature flue gas of the thermal runaway to smoothly enter the cavity 211. In the embodiment of the present application, since the exhaust portion 21 is attached to the top cover sheet, and further, it may be bonded together by an adhesive such as structural adhesive. Therefore, the high-temperature flue gas discharged after the thermal runaway of one or several battery cells 1 will not flow from between the battery cell 1 and the exhaust portion 21 to the pressure relief members 11 of adjacent other battery cells 1, thereby preventing the pressure relief members 11 of adjacent battery cells 1 from being forced to open. In addition, each exhaust hole 212 is covered by the shielding portion 22. After the high-temperature flue gas enters the cavity 211, it is located on the side of the shielding portion 22 facing away from the exhaust hole 212 and presses on the shielding portion 22. At this time, the shielding portion 22 can be further pressed against the inner wall of the cavity 211, so that the shielding portion 22 seals the exhaust hole 212 more tightly, thereby further preventing the high-temperature flue gas from flowing to the pressure relief members 11 of adjacent other battery cells 1, effectively protecting adjacent other battery cells 1, and effectively improving the safety of the battery pack.

[0047] It should be noted that the first surface 13 may be any surface of the battery cell 1, preferably the top surface or the bottom surface of the battery cell 1. Among them, the pressure relief member 11 may be an explosion-proof valve. When the pressure relief member 11 is disposed on the bottom surface, the pressure relief member 11 may be disposed at any position on the bottom surface, and the exhaust portion 21 may be directly attached to the bottom surface of the battery cell 1; when the pressure relief member 11 is disposed on the top surface, the pressure relief member 11 is disposed adjacent to the electrode terminal 12, and the exhaust portion 21 is also disposed adjacent to the electrode assembly, and the height difference from the electrode terminal 12 is minimized as much as possible, so as to facilitate the assembly of the entire battery pack.

[0048] In some embodiments, the exhaust assembly 2 includes a limiting member 23, and the limiting member 23 is disposed in the cavity 211 and connected to the exhaust portion 21; at least a part of the limiting member 23 is disposed on the side of the shielding portion 22 away from the exhaust hole 212, for abutting against the shielding portion 22 on the path of the shielding portion 22 rotating in a direction away from the exhaust hole 212.

[0049] In the embodiment of the present application, by providing a limiter 23, the limiter 23 can abut against the shielding part 22 after the shielding part 22 is impacted by the high-temperature flue gas and rotates to a certain angle, thereby limiting the further rotation of the shielding part 22. In this way, the rotation angle of the shielding part 22 is controlled, thereby controlling the discharge direction of the high-temperature flue gas and realizing directional exhaust.

[0050] Specifically, the shielding portion 22 is in contact with the high-temperature flue gas, and can disturb the high-temperature flue gas, thereby changing the flow direction of the high-temperature flue gas.

[0051] like Figure 14 As shown, when the pressure relief member 11 is opened to relieve pressure to allow the high-temperature flue gas to rush out, the high-temperature flue gas acts on the shielding portion 22 and causes the shielding portion 22 to rotate and open, and the opening angle is α°. At this time, the limiting member 23 abuts against the shielding portion 22 to limit the shielding portion 22 and prevent the shielding portion 22 from continuing to rotate, thereby achieving directional exhaust of the high-temperature flue gas.

[0052] In the embodiment of the present application, at least part of the limiting member 23 is arranged on the side of the shielding portion 22 away from the exhaust hole 212, so the limiting member 23 of the present application can be a convex block, in this case, the convex block is connected to the exhaust portion 21 and protrudes toward the shielding portion 22, and the convex block and the shielding portion 22 are spaced apart along the third direction Z. Alternatively, the limiting member 23 can be a crossbar placed horizontally in the cavity 211, the crossbar is connected to the inner wall of the exhaust portion 21, and the crossbar and the shielding portion 22 are spaced apart along the third direction Z. Alternatively, the limiting member 23 can also be a U-shaped frame, the two ends of which are arranged on both sides of the shielding portion 22 along the second direction Y and connected to the exhaust portion 21, in this case, the U-shaped frame is arranged across both sides of the shielding portion 22, and part of the U-shaped frame is arranged on the side of the shielding portion 22 away from the exhaust hole 212 along the third direction Z and is spaced apart from the shielding portion 22. Alternatively, a clearance hole (i.e., the limit hole 2221 hereinafter) may be provided on the shielding portion 22, the limit member 23 may be inserted into the clearance hole, and the end of the limit member 23 away from the battery cell 1 may be located on the side of the shielding portion 22 away from the exhaust hole 212, and the limit member 23 may abut against the shielding portion 22 after the shielding portion 22 rotates a certain angle. The above-mentioned embodiments may control the shielding portion 22 to be opened to a certain angle, and abut against the shielding portion 22 after the shielding portion 22 is opened to a certain angle to prevent the shielding portion 22 from continuing to rotate to a greater angle.

[0053] like Figure 11 and Figure 12As shown, in some embodiments, the shielding portion 22 includes a main body 221 and a connecting member 222. The main body 221 is disposed on the side of the exhaust hole 212 away from the battery cell 1 along the third direction Z, and the main body 221 covers and seals the exhaust hole 212; the connecting member 222 is connected to the main body 221, and one end of the connecting member 222 away from the main body 221 is hinged to the exhaust portion 21; at least a part of the limiting member 23 is disposed on the side of the connecting member 222 away from the battery cell 1 to limit the rotation angle of the connecting member 222.

[0054] In the embodiments of the present application, by providing the main body 221 to shield and seal the exhaust hole 212 and providing the connecting member 222 for hinging with the exhaust portion 21, such a structure can reduce the overall volume, material consumption and weight of the shielding portion 22, thereby facilitating the lightweight of the battery pack and reducing the material cost. At the same time, it can reduce the occupation of the volume of the cavity 211, reduce the blockage of gas, and make it more convenient for the high-temperature flue gas to be discharged.

[0055] As Figure 10 and Figure 11 As shown, in some embodiments, the connecting member 222 is provided with a limiting hole 2221, and the limiting hole 2221 penetrates the connecting member 222 along the third direction Z; the limiting member 23 is inserted into the limiting hole 2221, and a part of the limiting member 23 is located on the side of the limiting hole 2221 away from the battery cell 1; when the connecting member 222 rotates in a direction away from the exhaust hole 212, the end of the limiting member 23 away from the battery cell 1 abuts against the connecting member 222.

[0056] In the embodiments of the present application, by disposing the limiting member 23 in the limiting hole 2221, the space occupied by the limiting member 23 in the cavity 211 can be reduced, thereby facilitating the cavity 211 to accommodate the high-temperature flue gas and enabling the high-temperature flue gas to be discharged smoothly.

[0057] It should be noted that when the shielding portion 22 rotates in a direction away from the exhaust hole 212, the end of the limiting member 23 away from the battery cell 1 abuts against the connecting member 222. At this time, the rotation angle of the main body 221 can be controlled. Preferably, the rotation angle of the main body 221 can be less than 90 degrees. At this time, a more effective interference can be achieved on the gas flow direction of the high-temperature flue gas, and the high-temperature flue gas can be blocked by the main body 221 to change the flow direction of the high-temperature flue gas, thereby realizing the control of the high-temperature flue gas flow direction and achieving directional exhaust.

[0058] As Figure 13As shown, in some embodiments, the limiting member 23 includes a first section 231 and a second section 232. The first section 231 is disposed on the outer peripheral side of the exhaust hole 212 and is connected to the exhaust portion 21. When the main body 221 seals the exhaust hole 212, the first section 231 is in interference fit connection with the hole wall of the limiting hole 2221. The second section 232 is connected to the side of the first section 231 away from the exhaust hole 212 along the third direction Z. When the main body 221 is away from the exhaust hole 212, the second section 232 passes through the limiting hole 2221 and abuts against the connecting member 222.

[0059] In the embodiments of the present application, the first section 231 is in interference fit with the hole wall of the limiting hole 2221, and is used to limit the connecting member 222 when the pressure relief member 11 is not opened, preventing the connecting member 222 from moving. In the case where the connecting member 222 is fixed, the main body 221 also does not move, so that the main body 221 can seal the exhaust hole 212 well. At the same time, when the pressure relief member 11 is opened to relieve pressure, the pressure of the high-temperature flue gas acts on the main body 221 and impacts the main body 221 along the third direction Z. Under the action of the pressure, the main body 221 drives the connecting member 222 to rotate and overcomes the frictional force between the first section 231 and the hole wall of the limiting hole 2221. The connecting member 222 rotates, and the first section 231 disengages from the limiting hole 2221, so that the hole wall of the limiting hole 2221 does not contact the limiting member 23. At this time, the shielding portion 22 can rotate smoothly, enabling the exhaust hole 212 to communicate with the cavity 211 and allowing the high-temperature flue gas to be smoothly discharged into the cavity 211. During this process, the main body 221 continues to rotate in the direction away from the exhaust hole 212 under the action of the high-temperature flue gas and drives the connecting member 222 to rotate until the connecting member 222 abuts against the second section 232 of the limiting member 23. At this time, the connecting member 222 and the main body 221 no longer continue to rotate, and can partially block the high-temperature flue gas to change the flow direction of the high-temperature flue gas.

[0060] As Figure 13 As shown, in some embodiments, the limiting member 23 further includes a transition section 233. The transition section 233 is disposed between the first section 231 and the second section 232 and is respectively connected to the first section 231 and the second section 232. Along the direction of the first section 231 towards the second section 232, the outer diameter of the transition section 233 gradually decreases.

[0061] In the embodiment of the present application, the transition section 233 is a variable diameter structure, and the outer diameter of the transition section 233 gradually decreases from the first section 231 to the second section 232. At this time, it is convenient to assemble the shielding part 22, specifically, it is convenient for the first section 231 and the transition section 233 of the limiting member 23 to smoothly pass through the limiting hole 2221, and the first section 231 is finally located in the limiting hole 2221 and connected with the hole wall of the limiting hole 2221 by interference fit. That is, in the process of the shielding part 22 rotating toward the exhaust hole 212, the second section 232 is first located in the limiting hole 2221, and then the transition section 233 is located in the limiting hole 2221, and the outer diameter of the transition section 233 gradually increases toward the first section 231, and finally smoothly connects with the first section 231. At this time, the transition section 233 directly passes through the limiting hole 2221 and allows the first section 231 to smoothly enter the limiting hole 2221.

[0062] Please refer to Figures 4 - 10 In some embodiments, the exhaust portion 21 includes a first plate 213 and a second plate 214, the first plate 213 is arranged on one side of the battery cell 1 along the third direction Z and is in contact with the battery cell 1, and a plurality of exhaust holes 212 are arranged on the first plate 213 and penetrate the first plate 213 along the third direction Z; the shielding portion 22 is arranged on the side of the first plate 213 away from the battery cell 1 along the third direction Z, and the shielding portion 22 is hinged to the first plate 213; the shielding portion 22 is partially in contact with the outer peripheral side of the exhaust hole 212 when the pressure relief member 11 is not opened; the second plate 214 is arranged on the side of the shielding portion 22 away from the first plate 213 along the third direction Z, and the second plate 214 is connected to the first plate 213 and encloses a cavity 211.

[0063] In the embodiment of the present application, by providing the first plate 213 and the second plate 214, the exhaust assembly 2 can be a split structure, which is convenient for production and assembly, and further convenient for assembly of the shielding part 22. It is also convenient for the exhaust assembly 2 to contact and connect with the battery cell 1 to achieve effective gas conduction.

[0064] Specifically, the first plate 213 may be a flat plate structure, in which case the first plate 213 can be used to fit the first surface 13 of the battery cell 1, which may be an adhesive connection, to ensure that the exhaust assembly 2 and the battery cell 1 have a sufficient contact surface, thereby ensuring that the exhaust assembly 2 is fixed and stable, and that it is convenient for high-temperature flue gas to enter the cavity 211 from the exhaust hole 212 when the pressure relief member 11 is opened, and will not overflow from between the battery cell 1 and the first plate 213. The second plate 214 may be a plate with a U-shaped cross section, and specifically, the second plate 214 may be bent into a groove structure, in which case the first plate 213 is disposed at the opening of the groove and connected to the second plate 214 to enclose the cavity 211.

[0065] Please refer to Figure 5 and Figure 6, in some embodiments, along the first direction X, the first plate body 213 includes a first end 2131 and a second end 2132 which are oppositely arranged, and the shielding part 22 is hinged to one side of the exhaust hole 212 close to the first end 2131; the exhaust part 21 further includes a baffle plate 215, the baffle plate 215 is arranged at the first end 2131 and is hermetically connected to the first plate body 213 and the second plate body 214 respectively, and an exhaust port 216 is formed between the second end 2132 and the second plate body 214, and the exhaust port 216 is communicated with the cavity 211.

[0066] In the embodiments of the present application, by providing the baffle plate 215, one end of the exhaust part 21 is closed, and after the high-temperature flue gas enters the cavity 211, it can only be discharged from the exhaust port 216, so as to realize unidirectional gas guiding and exhausting. At the same time, the shielding part 22 is hinged to one side of the exhaust hole 212 close to the first end 2131. At this time, when the shielding part 22 rotates and opens, the opening faces the second end 2132, that is, the opening faces the exhaust port 216. At this time, after being blocked by the shielding part 22, further, it can be blocked by the main body 221, so that the discharging direction of the high-temperature flue gas is changed and flows towards the exhaust port 216, thereby realizing the directional exhaust of the high-temperature flue gas. In this way, the cooperation between the shielding part 22 and the exhaust port 216 realizes the directional exhaust and unidirectional exhaust of the high-temperature flue gas.

[0067] In some embodiments, there is a second direction Y that intersects with the first direction X and the third direction Z respectively. The battery cell 1 includes two electrode terminals 12 arranged at intervals along the second direction Y, and the pressure relief part 11 is arranged between the two electrode terminals 12; the exhaust assembly 2 is arranged between the two electrode terminals 12 and is connected to the battery cell 1.

[0068] In the embodiments of the present application, for a square battery, the pressure relief part 11 is preferably arranged between the two electrode terminals 12. At this time, the exhaust assembly 2 is also correspondingly arranged between the two electrode terminals 12. In this way, the occupation of the internal volume of the battery pack by the exhaust assembly 2 can be reduced, which is beneficial to reducing the volume of the battery pack and facilitating the realization of the light weight of the battery pack and the improvement of the volume energy density.

[0069] Correspondingly, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the foregoing embodiments, and the battery pack is used to supply power to the electrical device.

[0070] In the embodiments of the present application, the electrical device includes the foregoing battery pack, and the foregoing battery pack is used to supply power to the electrical device. Therefore, the electrical device includes all the technical features and technical effects of the foregoing battery pack.

[0071] Of course, the electrical device referred to in this application can be application devices such as vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and power tools. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.; the electric toys include stationary or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; the power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc. The embodiments of this application do not impose special restrictions on the above-mentioned electrical devices.

[0072] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0073] The above has introduced in detail a battery pack and an electrical device provided by the embodiments of this application, and specific examples have been used to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the technical solution and its core idea of this application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that: Having intersecting first and third directions, including: A plurality of battery cells are arranged along a first direction; a pressure relief member is provided on one side of the battery cells along the third direction; An exhaust assembly includes an exhaust portion and a plurality of shielding portions, wherein the exhaust portion is arranged along the third direction on a side of the battery cell where the pressure relief member is provided, and the exhaust portion is connected to a plurality of the battery cells; the exhaust portion has a cavity and a plurality of exhaust holes connected to the cavity, the plurality of exhaust holes are arranged on a side of the exhaust portion facing the battery cell, and the plurality of exhaust holes are arranged at intervals along the first direction; along the third direction, the orthographic projection of the pressure relief member on the exhaust portion is located within the exhaust hole; a plurality of shielding portions are arranged in the cavity, and each of the shielding portions is hinged to the exhaust portion and covers one of the exhaust holes; the shielding portion is configured to be able to rotate in a direction away from the exhaust hole when the pressure relief member is opened to relieve pressure.

2. The battery pack according to claim 1, characterized in that: The exhaust assembly also includes a limiter, which is arranged in the cavity and connected to the exhaust part; at least a portion of the limiter is arranged on a side of the shielding part away from the exhaust hole, so as to abut against the shielding part when the shielding part rotates in a direction away from the exhaust hole.

3. The battery pack according to claim 2, characterized in that: The shielding portion comprises: A body, arranged along the third direction on a side of the exhaust hole away from the battery cell, and covering the exhaust hole; A connecting member is connected to the main body, and one end of the connecting member away from the main body is hinged to the exhaust portion; at least part of the limiting member is arranged on a side of the connecting member away from the battery cell to limit the rotation angle of the connecting member.

4. The battery pack according to claim 3, characterized in that: The connecting member is provided with a limiting hole, and the limiting hole passes through the connecting member along the third direction; the limiting member is passed through the limiting hole, and part of the limiting member is located on the side of the limiting hole away from the battery cell; when the connecting member rotates in the direction away from the exhaust hole, one end of the limiting member away from the battery cell abuts against the connecting member.

5. The battery pack according to claim 4, characterized in that: The limiting member comprises: The first section is arranged on the outer peripheral side of the exhaust hole and connected to the exhaust part; when the main body covers the exhaust hole, the first section is connected to the hole wall of the limiting hole by interference fit; The second section is connected to a side of the first section away from the exhaust hole along the third direction; when the main body is away from the exhaust hole, the second section passes through the limiting hole and abuts against the connecting member.

6. The battery pack according to claim 5, characterized in that: The limiting member further includes a transition section, which is disposed between the first section and the second section and connected to the first section and the second section respectively; an outer diameter of the transition section gradually decreases along a direction from the first section toward the second section.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The exhaust section comprises: a first plate body, arranged on one side of the battery cell along the third direction and in contact with the battery cell, a plurality of exhaust holes being arranged on the first plate body and penetrating the first plate body along the third direction; the shielding portion being arranged on a side of the first plate body away from the battery cell along the third direction, the shielding portion being hinged to the first plate body; the shielding portion being partially in contact with the outer peripheral side of the exhaust hole when the pressure relief member is not opened; The second plate body is arranged along the third direction on a side of the shielding portion away from the first plate body, and the second plate body is connected to the first plate body to enclose the cavity.

8. The battery pack according to claim 7, characterized in that: Along the first direction, the first plate body includes a first end and a second end that are oppositely arranged, and the shielding portion is hinged to a side of the exhaust hole close to the first end; The exhaust portion further includes a baffle, which is disposed at the first end and sealedly connected to the first end and the second plate body respectively. The second end and the second plate body form an exhaust port, and the exhaust port is communicated with the cavity.

9. The battery pack according to claim 1, characterized in that: The battery pack has a second direction intersecting with the first direction and the third direction respectively, the battery cell includes two electrode terminals spaced apart along the second direction, the pressure relief member is arranged between the two electrode terminals; the exhaust assembly is arranged between the two electrode terminals and connected to the battery cell.

10. An electrical device, characterized in that: It comprises a battery pack as described in any one of claims 1 to 9, wherein the battery pack is used to supply power to the electrical device.

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