Battery pack and electric device

Abstract

The present invention relates to a battery pack (100) and an electric device. The battery pack (100) comprises a first housing (10), a battery cell assembly (20), a first member (30) and a top cover (40). The battery cell assembly (20) is arranged in the first housing (10), and comprises a plurality of battery cells (21). The first member (30) and the battery cell assembly (20) are arranged in a first direction, and the first member (30) comprises a bottom wall (31) and a plurality of side walls (32), wherein the side walls (32) are connected to the bottom wall (31), each side wall (32) is provided with a first opening (32a), and each first opening (32a) penetrates the corresponding side wall (32). The top cover (40) is connected to the first housing (10), and the top cover (40) and the first member (30) form a first space (401). The first member (30) and the battery cell assembly (20) form a second space (301), and the first openings (32a) communicate the first space (401) and the second space (301). When the battery cell assembly (20) undergoes thermal runaway or pressure relief, a gas and / or flame enters the first space (401) from the second space (301) through the first openings (32a), which can extend a pressure relief path, and increase collision between the gas and the first member (30) and collision between the first member (30) and the flame, thereby lowering the temperature of the gas, and eliminating part of the flame, thus facilitating flame extinguishing, lowering the temperature of the battery pack (100), protecting the battery pack (100), and improving the safety of the battery pack (100).

Description

Battery packs and electrical equipment Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery pack and an electrical device. Background Technology

[0002] Currently, battery packs are widely used in drones, electric vehicles, smart energy storage devices and other fields. However, battery packs may expand or thermal runaway during use, so it is necessary to improve battery pack safety.

[0003] Summary of the Invention

[0004] In view of this, it is necessary to provide a battery pack and electrical device that can improve safety.

[0005] This application provides a battery pack including a first housing, a cell assembly, a first component, and a top cover. The cell assembly is disposed in the first housing and includes multiple cells. The first component and the cell assembly are arranged along a first direction. The first component includes a bottom wall and multiple side walls, the side walls being connected to the bottom wall and having a first opening that penetrates through the side wall. The top cover is connected to the first housing, and the top cover and the first component form a first space. The first component and the cell assembly form a second space, and the first opening connects the first space and the second space. When the cell assembly experiences thermal runaway or pressure relief, gas and / or fire enters the first space from the second space through the first opening. This prolongs the pressure relief path, increases the collision between the gas and the first component, and increases the collision between the first component and the fire, thereby reducing the gas temperature, eliminating some of the fire, facilitating fire extinguishing, lowering the battery pack temperature, protecting the battery pack, and improving its safety.

[0006] In one or more of the above optional embodiments, the first opening directly connects the first space and the second space.

[0007] In one or more of the above optional embodiments, the first opening is directly connected to the second space, and the first space and the first opening are connected through other openings or spaces.

[0008] In one or more of the above optional embodiments, the first space is directly connected to the first opening, and the second space and the first opening are connected through other openings or spaces.

[0009] In one or more of the above optional embodiments, the first space and the first opening are connected through other openings or spaces, and the second space and the first opening are connected through other openings or spaces.

[0010] In one or more of the above optional embodiments, the sidewall includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first and second sidewalls are arranged along a second direction, and the third and fourth sidewalls are arranged along a third direction. The first, second, and third directions are perpendicular to each other. The first sidewall connects the third and fourth sidewalls, and the second sidewall connects the third and fourth sidewalls. A first opening is provided in the first sidewall, which facilitates pressure relief.

[0011] In one or more of the above optional embodiments, the second sidewall is not provided with an opening, which is conducive to depressurization, increases the collision between gas or fire and the first component, can prolong the depressurization path, eliminate part of the fire, and is conducive to extinguishing the fire.

[0012] In one or more of the above optional embodiments, neither the third nor the fourth sidewall has an opening, which increases the collision between the gas or fire and the first component, can prolong the pressure relief path, eliminate part of the fire, and help extinguish the fire.

[0013] In one or more of the above optional embodiments, the bottom wall, the first side wall, the second side wall, the third side wall and the fourth side wall form a first recess facing the top cover, which helps to extend the flow path of gas or fire and further improve the safety of the battery pack.

[0014] In one or more of the above optional embodiments, the first component includes a first extension connected to the first sidewall. The first extension extends away from the second sidewall, restricting gas or fire from escaping from the gap between the first component and the first sidewall. The projections of the first extension along the second direction and the projections of the first opening along the second direction are spaced apart along the first direction. Part of the gas or fire flows toward the first extension, and under the obstruction of the first extension, the gas or fire flows toward the first opening, which helps to reduce the flow velocity of the gas or fire.

[0015] In one or more of the above optional embodiments, a plurality of battery cells are arranged along a first direction. Along the first direction, each battery cell includes a first pressure relief portion. Along the first direction, the projection of a first extension portion overlaps with the projection of at least a portion of the first pressure relief portion. The first extension portion can block jet gas or fire impact, which is beneficial for extinguishing the fire.

[0016] In one or more of the above optional embodiments, multiple battery cells are arranged in a first direction. Along the first direction, the projection of the first extension overlaps with the projection of each first pressure relief portion, which is beneficial to improving the blocking of gas or fire impact and facilitating fire extinguishing.

[0017] In one or more of the above optional embodiments, along the first direction, the projection of the first extension covers the projection of each first pressure relief part, which is beneficial to further enhance the blocking of gas or fire impact and further facilitates fire extinguishing.

[0018] In one or more of the above optional embodiments, the first component includes a second extension connected to the second sidewall. The first extension and the second extension are arranged along a second direction. The second extension extends away from the first sidewall, restricting gas or fire from escaping from the gap between the first component and the second sidewall. The battery cell includes a second pressure relief portion. Along the first direction, the projection of the second extension overlaps with the projection of at least a portion of the second pressure relief portion. The second extension can block fire impact, which is beneficial for extinguishing the fire.

[0019] In one or more of the above optional embodiments, multiple battery cells are arranged in a first direction. Along the first direction, the projection of the second extension overlaps with the projection of each second pressure relief portion, which is beneficial for blocking gas or fire impact and for extinguishing fire.

[0020] In one or more of the above optional embodiments, along the first direction, the projection of the second extension covers each of the second pressure relief portions, which is beneficial for further blocking the impact of gas or fire, and further beneficial for extinguishing the fire.

[0021] In one or more of the above optional embodiments, the battery pack includes a second housing located within the first housing, and the cell assembly is disposed in the second housing to enhance the protection of the cell assembly. Along the first direction, a portion of the second housing is located between the top cover and the cell assembly, facilitating the fixation of the second housing.

[0022] In one or more of the above optional embodiments, the second housing includes a base and a first protrusion. The base includes a receiving space within which the cell assembly is located. The first protrusion extends from the base in a direction opposite to the first direction and has a second opening that connects the receiving space and the first opening, facilitating pressure relief.

[0023] In one or more of the above optional embodiments, the second opening directly connects the receiving space and the first opening.

[0024] In one or more of the above optional embodiments, the second opening connects the receiving space and the first opening through other spaces.

[0025] In one or more of the above optional embodiments, the accommodating space includes a third opening, the battery cell includes a first pressure relief portion, and along the first direction, at least a portion of the projection of the first pressure relief portion overlaps with the projection of the third opening, which is beneficial for pressure relief.

[0026] In one or more of the above optional embodiments, the first protrusion includes a third space, which communicates with the third opening and the second opening.

[0027] In one or more of the above optional embodiments, the third space is directly connected to the third opening and the second opening.

[0028] In one or more of the above optional embodiments, the third space is connected to the third opening and the second opening through other spaces.

[0029] In one or more of the above optional embodiments, the battery pack includes fasteners that secure a first component and a first housing along a first direction. Along the first direction, the fasteners and a second housing are separated. By securing the first component to the first housing, the first component further presses against the second housing, thereby securing the second housing.

[0030] In one or more of the above optional embodiments, the battery pack includes an electrical connector connected to the cell assembly, the electrical connector passing through a third opening, a second opening, and a first opening. A portion of the electrical connector is located in the third space, which can reduce the impact of gas or fire on the electrical connector and lower the risk of damage to the electrical connector.

[0031] In one or more of the above optional embodiments, along the first direction, the projection of the second housing is located within the projection range of the first member, which can reduce the gap between the first member and the side wall of the housing, and reduce the escape of gas or fire from the gap.

[0032] In one or more of the above optional embodiments, the top cover is provided with a third pressure relief section, from which gas or fire can flow to the outside of the battery pack.

[0033] In one or more of the above optional embodiments, the battery pack includes a first blocking member, and the top cover is provided with a third pressure relief portion. The top cover includes a first portion, the first blocking member connects to the first portion and forms a second recess, the second recess includes a fourth opening, and the third pressure relief portion is provided in the first portion, with the fourth opening communicating with the first opening. By connecting the first portion with the first blocking member to form the second recess, the pressure relief path can be further extended, which is beneficial for extinguishing a fire.

[0034] In one or more of the above optional embodiments, the first blocking member includes four blocking walls, which, together with the first portion, form a second recess and a fourth opening. The second recess is positioned facing the battery cell assembly. By positioning the fourth opening in a different direction from the first portion, the pressure relief path can be extended, increasing the collision between the fire and the blocking walls, which is beneficial for extinguishing the fire.

[0035] In one or more of the above optional embodiments, the first opening penetrates the sidewall along the second or third direction, and the first, second, and third directions are perpendicular to each other, which is beneficial to changing the flow direction of gas or fire and to extinguishing the fire.

[0036] In one or more of the above alternative embodiments, the bottom wall and the cell assembly are arranged along a first direction.

[0037] In one or more of the above optional embodiments, the first opening is provided on the second side wall, which helps to extend the pressure relief path, eliminate part of the fire, and help to extinguish the fire.

[0038] In one or more of the above optional embodiments, along the first direction, the projection of the first opening and the projection of the third pressure relief part are located on different sides of the projection of the bottom wall, which further helps to extend the pressure relief path, eliminate part of the fire, and help to extinguish the fire.

[0039] An embodiment of this application also provides an electrical device, including the battery pack in any of the above embodiments.

[0040] In the aforementioned battery pack and electrical equipment, when the battery cell assembly experiences thermal runaway or pressure relief, gas and / or fire enter the first space from the second space through the first opening. This prolongs the pressure relief path, increases the collision between the gas and the first component, and increases the collision between the first component and the fire. This can reduce the temperature of the gas, eliminate some of the fire, facilitate extinguishing the fire, reduce the temperature of the battery pack, protect the battery pack, and improve the safety of the battery pack. Attached Figure Description

[0041] Figure 1 shows a schematic diagram of the battery pack structure in some embodiments.

[0042] Figure 2 shows an exploded schematic diagram of the battery pack in some embodiments.

[0043] Figure 3 shows a schematic diagram of the battery pack from another perspective of Figure 1.

[0044] Figure 4 shows a schematic cross-sectional view of the battery pack in Figure 3 along BB.

[0045] Figure 5 shows a partially enlarged schematic diagram of Figure 4.

[0046] Figure 6 shows an enlarged schematic diagram of point C in Figure 4.

[0047] Figure 7 shows a schematic cross-sectional view of the battery pack in Figure 1 along AA.

[0048] Figure 8 shows a schematic diagram of the cell structure in some embodiments.

[0049] Figure 9 shows a schematic diagram of the structure of the first component in some embodiments.

[0050] Figure 10 shows a structural schematic diagram of the first component in Figure 9 from another perspective.

[0051] Figure 11 shows a structural schematic diagram of the first component in some other embodiments.

[0052] Figure 12 shows a structural schematic diagram of the first component in some other embodiments.

[0053] Figure 13 shows a schematic diagram of the battery pack portion in some embodiments.

[0054] Figure 14 shows a schematic diagram of the battery pack portion in some embodiments.

[0055] Figure 15 shows a schematic diagram of the structure of the battery pack section in some embodiments.

[0056] Figure 16 shows a schematic diagram of the structure of the first housing portion in some embodiments.

[0057] Figure 17 shows a schematic diagram of the structure of the second housing portion in some embodiments.

[0058] Figure 18 shows a schematic diagram of a portion of the battery pack from another perspective in some embodiments.

[0059] Figure 19 shows a schematic diagram of the top cover in some embodiments.

[0060] Figure 20 shows a schematic diagram of the structure of the electrical equipment in some embodiments.

[0061] Explanation of key component symbols:

[0062] Battery pack 100

[0063] First shell 10

[0064] first convex portion 10a

[0065] Bottom wall 11

[0066] Shell sidewall 12

[0067] First end face 12a

[0068] First connecting sidewall 121

[0069] Second connecting sidewall 122

[0070] Third connecting sidewall 123

[0071] Fourth connecting sidewall 124

[0072] Fixing part 13

[0073] Fixing hole 131

[0074] Battery cell assembly 20

[0075] First pressure relief section 20a

[0076] Second pressure relief section 20b

[0077] Cell 21

[0078] Cell casing 211

[0079] Main body 211a

[0080] Sealing part 211b

[0081] First sealing part 2111

[0082] Electrode assembly 212

[0083] Electrode terminal 213

[0084] First component 30

[0085] Connection hole 30b

[0086] Second Space 301

[0087] first recess 302

[0088] Bottom wall 31

[0089] Side wall 32

[0090] First opening 32a

[0091] First sidewall 321

[0092] Second sidewall 322

[0093] Third side wall 323

[0094] Fourth sidewall 324

[0095] Reinforcing rib 33

[0096] Top cover 40

[0097] Second end face 40a

[0098] Top cover recess 40b

[0099] First Space 401

[0100] Second recess 402

[0101] Fourth opening 402a

[0102] Third pressure relief section 41

[0103] Part 1, page 42

[0104] First extension 51

[0105] Second extension 52

[0106] Third Extension 53

[0107] Fourth extension 54

[0108] Circuit board 60

[0109] Second shell 70

[0110] Base 71

[0111] 711 cubic meters of space

[0112] Third opening 711a

[0113] First protrusion 72

[0114] Second opening 721

[0115] Third Space 722

[0116] Top wall 70a

[0117] Second protrusion 73

[0118] First limiting part 74

[0119] Second limiting part 75

[0120] First housing section 701

[0121] First receiving cavity 701a

[0122] Second housing part 702

[0123] Second receiving cavity 702a

[0124] First blocking component 80

[0125] Barrier 81

[0126] Connecting part 90

[0127] Second blocking component 110

[0128] Containment Space 101

[0129] Fastener 102

[0130] Seal 103

[0131] Electrical connector 104

[0132] 200 electrical appliances

[0133] First direction X

[0134] Second direction Y

[0135] Third direction Z

[0136] The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0137] The following specific embodiments are exemplary and not limiting, and are intended to provide a basic understanding of this application, and are not intended to identify key or decisive elements of this application or limit the scope of protection. As long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

[0138] When a component is considered to be "located" on another component, it can be directly located on the other component or may also be located in an intervening component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may also be located in an intervening component.

[0139] It is understandable that the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular or equal to each other. For example, combined with numerical description, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is a straight line or plane, the component can be considered a "straight line" or "plane".

[0140] The terms “vertical,” “horizontal,” “left,” “right,” “top,” “bottom,” “front,” “back,” and similar expressions used herein are for illustrative purposes only and are not intended to limit this application.

[0141] Unless otherwise defined, the term "multiple" in this document, when used to describe the number of components, specifically means that the component is two or more.

[0142] This application provides a battery pack including a first housing, a cell assembly, a first component, and a top cover. The cell assembly is disposed in the first housing and includes multiple cells. The first component and the cell assembly are arranged along a first direction. The first component includes a bottom wall and multiple side walls, the side walls being connected to the bottom wall and having a first opening that penetrates through the side wall. The top cover is connected to the first housing, and the top cover and the first component form a first space. The first component and the cell assembly form a second space, and the first opening connects the first space and the second space. When the cell assembly experiences thermal runaway or pressure relief, gas and / or fire enters the first space from the second space through the first opening. This prolongs the pressure relief path, increases the collision between the gas and the first component, and increases the collision between the first component and the fire, thereby reducing the gas temperature, eliminating some of the fire, facilitating fire extinguishing, lowering the battery pack temperature, protecting the battery pack, and improving its safety.

[0143] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0144] Please refer to Figures 1 to 7. One embodiment of this application provides a battery pack 100, including a first housing 10 and a cell assembly 20. The cell assembly 20 is disposed in the first housing 10 and includes a plurality of cells 21.

[0145] In some embodiments, the battery pack 100 includes a first component 30, and the first component 30 and the cell assembly 20 are arranged along a first direction X. The first component 30 includes a bottom wall 31 and a plurality of side walls 32, the side walls 32 being connected to the bottom wall 31. The side walls 32 are provided with a first opening 32a, the first opening 32a penetrating the side wall 32.

[0146] In some embodiments, the battery pack 100 includes a top cover 40 connected to a first housing 10. The top cover 40 and the first member 30 form a first space 401, which communicates with a first opening 32a. Optionally, the first space 401 is directly connected to the first opening 32a. Optionally, the first space 401 and the first opening 32a are connected through other openings or spaces.

[0147] In some embodiments, the first component 30 and the cell assembly 20 form a second space 301, and the first opening 32a connects to the second space 301. Optionally, the first opening 32a directly connects to the second space 301; alternatively, the second space 301 and the first opening 32a are connected through other openings or spaces.

[0148] In some embodiments, the first opening 32a connects the first space 401 and the second space 301. Optionally, the first opening 32a directly connects the first space 401 and the second space 301. Optionally, the first opening 32a directly connects the second space 301, and the first space 401 and the first opening 32a are connected through other openings or spaces. Optionally, the first space 401 directly connects to the first opening 32a, and the second space 301 and the first opening 32a are connected through other openings or spaces. Optionally, the first space 401 and the first opening 32a are connected through other openings or spaces, and the second space 301 and the first opening 32a are connected through other openings or spaces. When the battery cell assembly 20 experiences thermal runaway or pressure relief, gas and / or fire enter the first space 401 from the second space 301 through the first opening 32a. This prolongs the pressure relief path, increases the collision between the gas and the first component 30, and increases the collision between the first component 30 and the fire. This can reduce the temperature of the gas, eliminate some of the fire, and help extinguish the fire. It can also reduce the temperature of the battery pack 100, protect the battery pack 100, and improve the safety of the battery pack 100.

[0149] In some embodiments, the first opening 32a penetrates the sidewall 32 along the second direction Y or the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0150] In some embodiments, the bottom wall 31 and the cell assembly 20 are arranged along a first direction X.

[0151] In some embodiments, a plurality of battery cells 21 are arranged along a first direction X, and the stacking direction of the battery cells 21 and the setting direction of the first opening 32a are not in the same direction, which is beneficial to changing the flow direction of gas or fire and is beneficial to extinguishing fire.

[0152] Referring to Figures 2 and 4, in some embodiments, the first housing 10 includes a bottom wall 11 and a side wall 12, the bottom wall 11 being connected to the side wall 12 and forming a receiving space 101. The battery cell assembly 20 and the first component 30 are disposed in the receiving space 101. The top cover 40 is connected to the side wall 12 to close the receiving space 101.

[0153] In some embodiments, the housing sidewall 12 includes a first connecting sidewall 121, a second connecting sidewall 122, a third connecting sidewall 123, and a fourth connecting sidewall 124. The first connecting sidewall 121 and the second connecting sidewall 122 are arranged along a second direction Y, and the third connecting sidewall 123 and the fourth connecting sidewall 124 are arranged along a third direction Z. The first connecting sidewall 121 connects the third connecting sidewall 123 and the fourth connecting sidewall 124. The second connecting sidewall 122 connects the third connecting sidewall 123 and the fourth connecting sidewall 124.

[0154] Please refer to Figures 4, 6 and 19. In some embodiments, the sidewall 12 of the housing is provided with a first end face 12a and a first protrusion 10a extending from the first end face 12a on the side opposite to the bottom wall 11 of the housing. The thickness of the first protrusion 10a is less than the thickness of the sidewall 12 of the housing.

[0155] In some embodiments, the top cover 40 has a second end face 40a and a top cover recess 40b on the side facing the housing sidewall 12, and a first protrusion 10a is provided in the top cover recess 40b. The second end face 40a is connected to the first end face 12a, which can reduce the possibility of deformation at the connection between the housing sidewall 12 and the top cover 40, improve the connection between the first housing 10 and the top cover 40, and reduce the risk of gaps between the housing sidewall 12 and the top cover 40 affecting the sealing performance of the battery pack 100.

[0156] In some embodiments, the battery pack 100 includes a seal 103 disposed in the top cover recess 40b, and the first protrusion 10a abuts against the seal 103, which helps to improve the sealing performance of the battery pack 100.

[0157] Referring to Figures 2, 4, and 8, in some embodiments, each cell 21 includes a cell housing 211, an electrode assembly 212, and an electrode terminal 213. The electrode assembly 212 is disposed on the cell housing 211, and the electrode terminal 213 is connected to the electrode assembly 212 and extends out of the cell housing 211.

[0158] In some embodiments, the battery cell housing 211 includes a main body portion 211a and a sealing portion 211b, and the electrode assembly 212 is disposed on the main body portion 211a. The sealing portion 211b includes a first sealing portion 2111, which is connected to the main body portion 211a, and the electrode terminal 213 extends from the first sealing portion 2111.

[0159] In some embodiments, the battery cell 21 includes two electrode terminals 213 extending from a first sealing portion 2111. In other embodiments, the sealing portion 211b includes two first sealing portions 2111 arranged along a second direction Y, with one electrode terminal 213 extending from one of the first sealing portions 2111 and the other electrode terminal 213 extending from the other first sealing portion 2111. In this application, the two electrode terminals 213 extend from the same side of the battery cell housing 211 in a direction opposite to the second direction Y.

[0160] Referring to Figures 4, 9, and 10, in some embodiments, the plurality of sidewalls 32 include a first sidewall 321, a second sidewall 322, a third sidewall 323, and a fourth sidewall 324. The first sidewall 321 and the second sidewall 322 are arranged along a second direction Y, and the third sidewall 323 and the fourth sidewall 324 are arranged along a third direction Z. The first sidewall 321 connects the third sidewall 323 and the fourth sidewall 324, and the second sidewall 322 connects the third sidewall 323 and the fourth sidewall 324. The first sidewall 321, the second sidewall 322, the third sidewall 323, and the fourth sidewall 324 connect to the bottom wall 31.

[0161] In some embodiments, as shown in FIG9, a first opening 32a is provided on a first sidewall 321, which is beneficial for pressure relief.

[0162] In some embodiments, as shown in FIG11, a first opening 32a is provided on a third sidewall 323, which facilitates pressure relief.

[0163] In some embodiments, as shown in FIG12, a first opening 32a is provided on the fourth sidewall 324, which facilitates pressure relief.

[0164] In some embodiments, the first opening 32a is provided on the second sidewall 322, which is beneficial for pressure relief, can extend the pressure relief path, eliminate part of the fire, and facilitate the extinguishing of the fire.

[0165] In some embodiments, the second sidewall 322 is not provided with an opening, which is not limited to the first opening 32a, but can be any opening that penetrates the second sidewall 322.

[0166] In some embodiments, the third sidewall 323 has no opening, and the opening is not limited to the first opening 32a, but can be any opening that penetrates the third sidewall 323. The fourth sidewall 324 has no opening. The opening is not limited to the first opening 32a, but can be any opening that penetrates the fourth sidewall 324.

[0167] In some embodiments, as shown in Figures 9 and 10, a first opening 32a is provided on a first sidewall 321, while no opening is provided on the second sidewall 322, the third sidewall 323, or the fourth sidewall 324. This increases the collision between the gas or fire and the first component 30, which can prolong the pressure relief path, eliminate part of the fire, and facilitate extinguishing the fire.

[0168] In some embodiments, the bottom wall 31, the first side wall 321, the second side wall 322, the third side wall 323, and the fourth side wall 324 form a first recess 302. The first recess 302 faces the top cover 40, which helps to extend the flow path of gas or fire and further improves the safety of the battery pack 100.

[0169] Referring to Figures 4, 9, and 10, in some embodiments, the first member 30 includes a first extension 51 connected to the first sidewall 321, extending away from the second sidewall 322. This restricts the leakage of gas or fire from the gap between the first member 30 and the first sidewall 321.

[0170] In some embodiments, the projections of the first extension 51 along the second direction Y and the first opening 32a along the second direction Y are spaced apart along the first direction X. A portion of the gas or a portion of the fire flows toward the first extension 51, and under the obstruction of the first extension 51, the gas or fire flows toward the first opening 32a, which helps to reduce the flow velocity of the gas or fire.

[0171] In some embodiments, please refer to FIG9, the first extension 51 extends from the end of the first sidewall 321 away from the bottom wall 31.

[0172] Please refer to Figures 4 and 8. In some embodiments, the cell 21 includes a first pressure relief section 20a.

[0173] In some embodiments, the battery cell 21 is a pouch cell, wherein the first pressure relief portion 20a may be a sealing portion 211b. For example, in this application, the electrode terminal 213 extends from the first sealing portion 2111, and the first sealing portion 2111 is the first pressure relief portion 20a.

[0174] In some embodiments, cell 21 is a rigid-cased cell. The first pressure relief section 20a is a pressure relief valve for the rigid-cased cell. Optionally, the rigid-cased cell includes prismatic cells and round cells.

[0175] In some embodiments, along the first direction X, the projection of the first extension 51 overlaps with the projection of at least a portion of the first pressure relief portion 20a. The first extension 51 can block the impact of jet gas or fire, which is beneficial for extinguishing the fire.

[0176] In some embodiments, a plurality of battery cells 21 are arranged in a first direction X. In some embodiments, along the first direction X, the projection of the first extension 51 overlaps with the projection of at least a portion of the first pressure relief portion 20a. The first extension 51 can block the impact of jet gas or fire, which is beneficial for extinguishing the fire.

[0177] Along the first direction X, the projection of the first extension 51 overlaps with the projection of each first pressure relief part 20a, which is beneficial to improving the blocking of gas or fire impact and facilitating fire extinguishing.

[0178] In some embodiments, along the first direction X, the projection of the first extension 51 covers the projection of each first pressure relief portion 20a, which is beneficial to further enhance the blocking of gas or fire impact and further facilitates fire extinguishing.

[0179] In some embodiments, the first member 30 includes a second extension 52 connected to a second sidewall 322, extending away from the first sidewall 321. This restricts the leakage of gas or fire from the gap between the first member 30 and the second sidewall 322. The first extension 51 and the second extension 52 are aligned along a second direction Y.

[0180] In some embodiments, the battery cell 21 includes a second pressure relief section 20b.

[0181] In some embodiments, please refer to FIG8, the cell 21 is a pouch cell, and the two electrode terminals 213 extend from the same side of the cell housing 211. The second pressure relief portion 20b may be the end of the cell housing 211 away from the sealing portion 212b.

[0182] In some embodiments, the battery cell 21 is a pouch cell, with two electrode terminals 213 extending from opposite sides of the battery cell housing 211. The battery cell 21 includes two first sealing portions 2111, one of which is a first pressure relief portion 20a, and the other is a second pressure relief portion 20b.

[0183] In some embodiments, cell 21 is a rigid-cased cell. The second pressure relief section 20b is a pressure relief valve for the rigid-cased cell. Optionally, the rigid-cased cell includes prismatic cells and round cells.

[0184] In some embodiments, along the first direction X, the projection of the second extension 52 overlaps with the projection of at least a portion of the second pressure relief portion 20b, and the second extension 52 can block fire impact, which is beneficial for extinguishing the fire.

[0185] In some embodiments, along the first direction X, the projection of the second extension 52 overlaps with the projection of each second pressure relief portion 20b, which is beneficial for blocking gas or fire impact and for extinguishing the fire.

[0186] In some embodiments, the projection of the second extension 52 along the first direction X covers each of the second pressure relief portions 20b, which is beneficial for further blocking gas or fire impact and further beneficial for extinguishing the fire.

[0187] In some embodiments, the first member 30 includes a third extension 53 connected to a third sidewall 323, the third extension 53 extending away from the fourth sidewall 324. This restricts the leakage of gas or fire from the gap between the first member 30 and the third sidewall 323.

[0188] In some embodiments, the third structural member includes a fourth extension 54 connected to a fourth sidewall 324, extending away from the third extension 53. This restricts the leakage of gas or fire from the gap between the first member 30 and the fourth sidewall 324.

[0189] Please refer to Figure 10. In some embodiments, the battery pack 100 includes a reinforcing rib 33, which connects the first sidewall 321 and the first extension 51. This helps to improve the impact resistance of the first extension 51 and reduce the risk of deformation caused by impact.

[0190] In some embodiments, the reinforcing rib 33 connects the second sidewall 322 and the second extension 52, which helps to improve the impact resistance of the second extension 52 and reduce the risk of deformation of the second extension 52 due to impact.

[0191] In some embodiments, the first component 30 is made of metal or the surface of the first component 30 is covered with metal.

[0192] Referring to Figures 2, 4, and 8, in some embodiments, the battery pack 100 includes a circuit board 60, with the circuit board 60 and cell housing 211 arranged along a second direction Y, and electrode terminals 213 connected to the circuit board 60. Optionally, the circuit board 60 includes a flexible printed circuit board (FPC). Alternatively, the circuit board 60 includes a printed circuit board (PCB).

[0193] In some embodiments, the circuit board 60 includes a BMS (Battery Management System) component, which includes multiple electronic components that can perform functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0194] Please refer to Figures 4, 13 to 18. In some embodiments, the battery pack 100 includes a second housing 70, which is disposed within the first housing 10. The cell assembly 20 is disposed in the second housing 70 to enhance the protection of the cell assembly 20.

[0195] In some embodiments, along the first direction X, a portion of the second housing 70 is located between the top cover 40 and the cell assembly 20 to facilitate securing the second housing 70.

[0196] In some embodiments, the circuit board 60 is disposed within the second housing 70.

[0197] In some embodiments, the projection of the second housing 70 is located within the projection of the first member 30 along the first direction X, which can reduce the gap between the first member 30 and the housing sidewall 12, and reduce the escape of gas or fire from the gap.

[0198] In some embodiments, the second housing 70 includes a base 71, the base 71 including a receiving space 711, and the battery cell assembly 20 is disposed within the receiving space 711.

[0199] In some embodiments, the second housing 70 includes a first protrusion 72 extending from the base 71 in a direction opposite to the first direction X.

[0200] In some embodiments, the first protrusion 72 is provided with a second opening 721, which connects the receiving space 711 and the first opening 32a, facilitating pressure relief. Optionally, the second opening 721 directly connects the receiving space 711 and the first opening 32a. Optionally, the second opening 721 connects the receiving space 711 and the first opening 32a through other spaces.

[0201] In some embodiments, the first protrusion 72 and the first sidewall 321 are arranged along the second direction Y. The first extension 51 connects to the first protrusion 72, which facilitates fixing the second housing 70.

[0202] In some embodiments, the accommodating space 711 includes a third opening 711a, and at least part of the projection of the first pressure relief portion 20a overlaps with the projection of the third opening 711a along the first direction X, which is beneficial for pressure relief.

[0203] In some embodiments, the base 71 has a top wall 70a and a bottom wall 31 connected to the top wall 70a, which can restrict the position of the second housing 70 within the first housing 10 along a first direction X.

[0204] In some embodiments, the third opening 711a extends through the top wall 70a.

[0205] In some embodiments, the second housing 70 includes a first limiting portion 74 and a second limiting portion 75, which are spaced apart on the top wall 70a along a third direction Z. A third side wall 323 and a fourth side wall 324 are disposed between the first limiting portion 74 and the second limiting portion 75 along the third direction Z, which can limit the position of the second housing 70 within the first housing 10.

[0206] In some embodiments, the second housing 70 includes a first housing portion 701 and a second housing portion 702 arranged along a third direction Z. The first housing portion 701 is provided with a first receiving cavity 701a, and the second housing portion 702 is provided with a second receiving cavity 702a. The first housing portion 701 is connected to the second housing portion 702 and forms a receiving space 711.

[0207] In some embodiments, the first protrusion 72 includes a third space 722, which connects the third opening 711a and the second opening 721. Optionally, the third space 722 directly connects the third opening 711a and the second opening 721. Optionally, the third space 722 connects the third opening 711a and the second opening 721 through other spaces.

[0208] In some embodiments, the second housing 70 includes a second protrusion 73 extending from the base 71 in a direction opposite to the first direction X. The first protrusion 72 and the second protrusion 73 are spaced apart along the second direction Y.

[0209] In some embodiments, the second extension 52 connects to the second protrusion 73, and the second sidewall 322 and the second protrusion 73 are arranged along the second direction Y. The connection between the second extension 52 and the second protrusion 73 facilitates the fixation of the second housing 70.

[0210] In some embodiments, the battery pack 100 includes an electrical connector 104 connected to the cell assembly 20. The electrical connector 104 passes through a third opening 711a, a second opening 721 and a first opening 32a, and is partially disposed in a first recess 302.

[0211] In some embodiments, a portion of the electrical connector 104 is located in the third space 722, which can reduce the impact of gas or fire on the electrical connector 104 and reduce the risk of damage to the electrical connector 104.

[0212] In some embodiments, the electrical connector 104 may transmit electrical energy or signals. Optionally, the electrical connector 104 may include a wire harness.

[0213] Please refer to Figures 2, 4 and 11. In some embodiments, the first housing 10 includes a fixing part 13, which is disposed on the inner wall of the first connecting side wall 121, and / or the fixing part 13 is disposed on the inner wall of the second connecting side wall 122.

[0214] In some embodiments, the battery pack 100 includes a fastener 102 that secures the first component 30 to the first housing 10. This allows the force on the first component 30 to be transferred to the first housing 10, thus enhancing protection for the first component 30.

[0215] In some embodiments, the fastener 102 and the second housing 70 are separated along the first direction X. The second housing 70 is fixed by fixing the first component 30 to the first housing 10 and pressing the second housing 70 with the first component 30.

[0216] In some embodiments, the fixing part 13 is provided with a fixing hole 131, and the first component 30 is provided with a connecting hole 30b. Along the first direction X, the fastener 102 passes through the connecting hole 30b and connects to the fixing hole 131 to fix the first component 30 to the first housing 10. Optionally, the fastener 102 includes a screw.

[0217] In some embodiments, the fixing part 13 is disposed on the inner wall of the third connecting side wall 123 and the fixing part 13 is disposed on the inner wall of the fourth connecting side wall 124.

[0218] In some embodiments, a connecting hole 30b is provided in the first extension 51, and a fastener 102 passes through the first extension 51 and connects to the fixing hole 131. The first member 30 is fixedly connected to the first housing 10 through the first extension 51. The first extension 51 is connected to the first protrusion 72, and the first extension 51 can restrict the movement of the second housing 70.

[0219] In some embodiments, a connecting hole 30b is provided in the second extension 52, and a fastener 102 passes through the second extension 52 and connects to the fixing hole 131. The first component 30 is fixedly connected to the first housing 10 through the second extension 52.

[0220] Please refer to Figures 4 to 6 and Figure 19. In some embodiments, the top cover 40 is provided with a third pressure relief section 41, from which gas or fire can flow to the outside of the battery pack 100.

[0221] In some embodiments, please refer to FIG7, the third pressure relief section 41 includes a through hole that penetrates the first section 42, through which gas or fire is discharged.

[0222] In some embodiments, the third pressure relief section 41 includes a pressure relief valve fixed to the first section 42. When the battery cell 21 thermally runs away and the gas pressure is greater than the pressure relief threshold of the pressure relief valve, the pressure relief valve opens and discharges gas.

[0223] In some embodiments, the third pressure relief section 41 includes a weak area, the structural strength of which is less than the thickness of the remaining area of ​​the first section 42. When the cell 21 experiences thermal runaway, the weak area is blasted open by gas or fire to relieve pressure.

[0224] In some embodiments, along the first direction X, the projection of the first opening 32a and the projection of the third pressure relief part 41 are located on different sides of the projection of the bottom wall 31, which further helps to extend the pressure relief path, eliminate part of the fire, and help to extinguish the fire.

[0225] Referring to Figures 4 to 6 and Figure 19, in some embodiments, the battery pack 100 includes a first blocking member 80, and the top cover 40 includes a first portion 42. The first blocking member 80 connects to the first portion 42, and the first blocking member 80 and the first portion 42 form a second recess 402. The second recess 402 includes a fourth opening 402a. A third pressure relief portion 41 is provided in the first portion 42, and the fourth opening 402a communicates with the first opening 32a. The connection of the first portion 42 with the first blocking member 80 to form the second recess 402 further extends the pressure relief path, which is beneficial for extinguishing a fire. Optionally, the fourth opening 402a and the first opening 32a are directly connected. Optionally, the fourth opening 402a and the first opening 32a are connected through other spaces.

[0226] In some embodiments, the first blocking member 80 includes four blocking walls 81, the four blocking walls 81 and the first portion 42 forming a second recess 402 and a fourth opening 402a, the second recess 402 being disposed toward the cell assembly 20.

[0227] By setting the fourth opening 402a and the first part 42 in different directions, the pressure relief path can be extended, the collision between the fire and the blocking wall 81 can be increased, which is conducive to extinguishing the fire.

[0228] In some embodiments, one of the blocking walls 81 is integrally formed with the top cover 40, and three of the four blocking walls 81 are connected to the top cover 40. Along the first direction X, the blocking wall 81 opposite to the fourth opening 402a is part of the top cover 40.

[0229] In some embodiments, four barrier walls 81 are mounted on the top cover 40.

[0230] Figure 4 shows a schematic cross-sectional view of the battery pack 100 in Figure 3 along BB. For ease of description, some structural components of the battery pack 100 are not shown. When the cell 21 is depressurized, the first component 30 can extend the flow path of gas or fire.

[0231] Referring to Figure 4, in some embodiments, the battery pack 100 includes a connection portion 90 that connects to the top cover 40. An electrical connector 104 passes through a first opening 32a and is connected to the connection portion 90. A portion of the connection portion 90 is located within the top cover 40, and a portion extends beyond the top cover 40. The connection portion 90 is configured to connect to an external device.

[0232] Referring to Figure 19, in some embodiments, the battery pack 100 includes a second barrier 110 that encloses part of the connection portion 90, protects the connection portion 90, and reduces damage to the connection portion 90 caused by high-temperature gas.

[0233] In some embodiments, along the first direction X, the projection of the connecting portion 90 is located within the projection of the second blocking member 110, which further helps to protect the connecting portion 90 and reduce the damage to the connecting portion 90 caused by high-temperature gas.

[0234] Referring to Figure 20, this application also provides an electrical device 200 employing the aforementioned battery pack 100. In one embodiment, the electrical device 200 of this application may be, but is not limited to, electronic devices, drones, backup power supplies, electric vehicles, electric motorcycles, electric-assisted bicycles, power tools, large household battery modules, etc.

[0235] Those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the spirit and essence of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack, characterized in that, include: First shell; A battery cell assembly is disposed in the first housing, and the battery cell assembly includes a plurality of battery cells; A first component, the first component and the battery cell assembly are arranged along a first direction, the first component includes a bottom wall and a plurality of side walls, the side walls are connected to the bottom wall, the side walls are provided with a first opening, the first opening penetrates the side walls; A top cover is connected to the first housing, and the top cover and the first component form a first space; The first component and the cell assembly form a second space, and the first opening connects the first space and the second space.

2. The battery pack as described in claim 1, characterized in that, The sidewall includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first and second sidewalls are arranged along a second direction, and the third and fourth sidewalls are arranged along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The first sidewall connects the third sidewall and the fourth sidewall, the second sidewall connects the third sidewall and the fourth sidewall, and the first opening is located on the first sidewall.

3. The battery pack as described in claim 2, characterized in that, The second sidewall has no opening.

4. The battery pack as described in claim 2 or 3, characterized in that, Neither the third sidewall nor the fourth sidewall has the opening.

5. The battery pack according to any one of claims 2 to 4, characterized in that, The bottom wall, the first side wall, the second side wall, the third side wall and the fourth side wall form a first recess, which faces the top cover.

6. The battery pack according to any one of claims 2 to 5, characterized in that, The first component includes a first extension connected to the first sidewall, the first extension extending in a direction away from the second sidewall; The projections of the first extension along the second direction and the projections of the first opening along the second direction are arranged at intervals along the first direction.

7. The battery pack as described in claim 6, characterized in that, The plurality of battery cells are arranged along the first direction, and each battery cell includes a first pressure relief portion. Along the first direction, the projection of the first extension portion overlaps with the projection of at least a portion of the first pressure relief portion.

8. The battery pack as described in claim 6 or 7, characterized in that, The first component includes a second extension connected to the second sidewall, the first extension and the second extension are arranged along the second direction, and the second extension extends in a direction away from the first sidewall; The battery cell includes a second pressure relief portion, and along the first direction, the projection of the second extension portion overlaps with the projection of at least a portion of the second pressure relief portion.

9. The battery pack according to any one of claims 2 to 8, characterized in that, The battery pack includes a second housing located within the first housing, and the battery cell assembly is disposed in the second housing; Along the first direction, a portion of the second housing is located between the top cover and the cell assembly.

10. The battery pack as claimed in claim 9, characterized in that, The second housing includes a base and a first protrusion; The base includes a receiving space, and the battery cell assembly is located within the receiving space; Along a direction opposite to the first direction, the first protrusion extends from the base, and the first protrusion is provided with a second opening, the second opening communicating with the receiving space and the first opening.

11. The battery pack as claimed in claim 10, characterized in that, The accommodating space includes a third opening, and the battery cell includes a first pressure relief portion. Along the first direction, at least a portion of the projection of the first pressure relief portion overlaps with the projection of the third opening.

12. The battery pack as claimed in claim 11, characterized in that, The first protrusion includes a third space, which connects the third opening and the second opening.

13. The battery pack according to any one of claims 10 to 12, characterized in that, The battery pack includes fasteners that secure the first component and the first housing along the first direction; Along the first direction, the fastener and the second housing are separated.

14. The battery pack as claimed in claim 12, characterized in that, The battery pack includes an electrical connector connected to the cell assembly, the electrical connector passing through the third opening, the second opening, and the first opening; The portion of the electrical connector is located in the third space.

15. The battery pack according to any one of claims 9 to 14, characterized in that, Along the first direction, the projection of the second housing lies within the projection range of the first component.

16. The battery pack according to any one of claims 1 to 15, characterized in that, The battery pack includes a first blocking element, and the top cover includes a third pressure relief section; The top cover includes a first part, a first blocking member is connected to the first part and forms a second recess, the second recess includes a fourth opening, and the third pressure relief part is provided on the first part, the fourth opening and the first opening are in communication.

17. The battery pack as claimed in claim 16, characterized in that, The first blocking member includes four blocking walls, which, together with the first portion, form the second recess and the fourth opening, with the second recess facing the cell assembly.

18. The battery pack according to any one of claims 1 to 17, characterized in that, Along a second direction or a third direction, the first opening penetrates the sidewall, and the first direction, the second direction, and the third direction are perpendicular to each other.

19. The battery pack according to any one of claims 1 to 18, characterized in that, The bottom wall and the cell assembly are arranged along the first direction.

20. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 19.

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