Battery and electric device

Abstract

The present application provides a battery and an electric device. The battery comprises a case body and battery cells; vent holes passing through the case body in the thickness direction of the case body are formed on the case body, and the battery cells are accommodated in the case body. Each battery cell comprises a casing, and a first pressure relief mechanism and two electrodes arranged on the casing, the first pressure relief mechanism is communicated with the vent holes and the interior of the casing in an open state, and at least one of the two electrodes and the first pressure relief mechanism are arranged on the same side of the casing. The vent holes pass through the case body in the thickness direction of the case body, the first pressure relief mechanism is communicated with the vent holes and the interior of the casing in the open state, gas discharged from the first pressure relief mechanism is discharged out of the case body through the vent holes, and the gas is cooled and depressurized by means of the outside space of the case body, so that the risk of gas detonation inside the case body is reduced or eliminated, improving the safety performance of the battery.

Description

Battery and power device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 4, 2023, with application number 202311640993.4 and invention name “A Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of new energy technology, and more specifically, relates to a battery and an electrical device. Background Art

[0003] Generally, the box body provides a space for accommodating single cells, and the box wall of the box body is provided with a cavity. When a single cell experiences thermal runaway, the gas inside the single cell is diverted to the accommodating space or cavity through an explosion-proof valve.

[0004] Both the accommodating space and the cavity belong to the internal space of the box. The volume of the internal space is limited, and the effect of cooling and reducing the pressure of the gas is limited. Therefore, the risk of short circuit failure of the battery will increase, which is not conducive to improving the safety performance of the battery. Technical issues

[0005] The purpose of the embodiments of the present application is to provide a battery and an electrical device to solve the technical problem that existing batteries may drain gas into the interior of the box, which may easily cause safety hazards. Technical Solutions

[0006] To solve the above technical problems, the technical solutions adopted in the embodiments of the present application are:

[0007] In a first aspect, a battery is provided, comprising a housing and a battery cell; the housing is provided with an exhaust hole penetrating the housing along a thickness direction thereof, and the battery cell is accommodated in the housing;

[0008] The battery cell includes a shell, a first pressure relief mechanism and two electrodes provided on the shell, wherein the first pressure relief mechanism connects the exhaust hole and the interior of the shell when in an open state, and at least one of the two electrodes and the first pressure relief mechanism are provided on the same side of the shell.

[0009] In some embodiments, the battery further includes an isolating member connected between the box body and the battery cell, one side of the isolating member is isolated from the other side facing away from the one side, the first pressure relief mechanism and the exhaust hole are arranged on the one side, and the electrode on the same side as the first pressure relief mechanism is arranged on the other side.

[0010] The isolating member isolates the first pressure relief mechanism and the electrode, and also isolates the exhaust hole and the electrode, isolating the path of gas discharged from the first pressure relief mechanism to the exhaust hole from the electrode, thereby preventing the gas from adversely affecting the electrode and its insulation design.

[0011] In some embodiments, the first pressure relief mechanism and the two electrodes are arranged on the same side of the shell, and the first pressure relief mechanism is arranged between the two electrodes; the isolation member is provided between the first pressure relief mechanism and one of the electrodes, and the isolation member is provided between the first pressure relief mechanism and the other electrode.

[0012] When the first pressure relief mechanism and the two electrodes are arranged on the same side of the shell, an isolating member is used to isolate one electrode from the first pressure relief mechanism, and another isolating member is used to isolate the other electrode from the first pressure relief mechanism. The two electrodes are isolated separately, and the path of gas discharged from the first pressure relief mechanism to the exhaust hole is isolated from any electrode, preventing the gas from having an adverse effect on any electrode and its insulation design.

[0013] In some embodiments, the first pressure relief mechanism is disposed at a central position between the two electrodes.

[0014] The first pressure relief mechanism is spaced consistently with the two electrodes, and the space between the first pressure relief mechanism and any electrode is sufficient, making it convenient to provide an isolation member between the first pressure relief mechanism and any electrode.

[0015] In some embodiments, the first pressure relief mechanism is adjacent to one of the electrodes and distal to the other electrode.

[0016] Another arrangement of the first pressure relief mechanism is provided, which is suitable for an arrangement requirement in which the distance between one electrode and the first pressure relief mechanism needs to be greater than the distance between the other electrode and the first pressure relief mechanism.

[0017] In some embodiments, the first pressure relief mechanism and the two electrodes are disposed on the same side of the housing, the first pressure relief mechanism and the two electrodes are disposed sequentially, and the isolation member is disposed between the first pressure relief mechanism and the adjacent electrodes.

[0018] Another arrangement of the first pressure relief mechanism is provided, which is suitable for the arrangement requirement that the first pressure relief mechanism is arranged on a side of the battery cell, while the two electrodes are arranged on another side or in the middle area.

[0019] In some embodiments, the battery includes a plurality of battery cells, the plurality of battery cells are stacked along a first direction, any two adjacent battery cells are placed oppositely along a second direction, and the first direction is perpendicular to the second direction.

[0020] Any two adjacent battery cells placed oppositely along the second direction can form two groups of first pressure relief mechanisms spaced apart along the second direction, each group including multiple first pressure relief mechanisms arranged along the first direction, which is conducive to the layout and arrangement of the first pressure relief mechanisms according to the internal space of the battery.

[0021] In some embodiments, the battery includes a plurality of battery cells, the plurality of battery cells are stacked along a first direction, any two adjacent battery cells are placed in the same direction along a second direction, and the first direction is perpendicular to the second direction.

[0022] Any two adjacent battery cells placed identically along the second direction can form a group of multiple first pressure relief mechanisms arranged along the first direction, which is beneficial for arranging the first pressure relief mechanisms according to the internal space of the battery.

[0023] In some embodiments, the battery includes a plurality of battery cells, and the plurality of battery cells are stacked along a first direction; the isolation member extends along the first direction, and the isolation member is connected to the plurality of battery cells.

[0024] A plurality of battery cells are isolated from the electrodes by a first pressure relief mechanism and exhaust holes through an isolating member, thereby simplifying the internal structure of the battery.

[0025] In some embodiments, the spacing distance between the separator and the adjacent electrode is greater than or equal to 35 mm;

[0026] A dimension of the separator in a direction in which the separator points to the adjacent electrode is greater than or equal to 4 mm and is less than or equal to a spacing distance between the separator and the adjacent electrode.

[0027] In the direction of the isolating member pointing to the adjacent electrode, the size of the isolating member is greater than or equal to 4 mm and less than or equal to the distance between the isolating member and the adjacent electrode. While achieving the isolation effect, the connection strength between the isolating member and the box body and the battery cell can be improved.

[0028] In some embodiments, a dimension of the spacer in a direction from the box body to the battery cell is greater than or equal to 0.3 mm.

[0029] In the direction from the box to the battery cell, the size of the isolating piece is greater than or equal to 0.3 mm, which can improve the connection strength between the isolating piece, the box and the battery cell while achieving the isolation effect.

[0030] In some embodiments, the box body is provided with a channel structure, the channel structure and the first pressure relief mechanism are provided on both sides of the axial direction of the exhaust hole, and the exhaust hole is communicated with the channel structure.

[0031] The channel structure guides the gas to be discharged from the box in a directional manner, which is conducive to directional control of the gas, reduces the probability of safety hazards, reduces the number of paths for gas to be discharged from the box, and simplifies the structural design of the box.

[0032] In some embodiments, the box body is provided with a second pressure relief mechanism, which is provided at an end of the channel structure away from the exhaust hole, and the second pressure relief mechanism connects the channel structure and the outside of the box body when in an open state.

[0033] A second pressure relief mechanism is provided at the end of the channel structure to facilitate directional gas discharge and reduce the probability of safety hazards.

[0034] In some embodiments, the battery includes a plurality of battery cells stacked along a first direction, the box body is provided with a plurality of exhaust holes arranged along the first direction, the plurality of exhaust holes are respectively connected to the channel structure, and the first pressure relief mechanism is arranged one-to-one with the exhaust holes.

[0035] When the battery includes a plurality of battery cells, a plurality of exhaust holes are provided, and the arrangement direction of the plurality of exhaust holes is made consistent with the arrangement direction of the plurality of battery cells, thereby achieving exhaust arrangement of the plurality of battery cells.

[0036] In some embodiments, the battery includes a plurality of battery cells stacked along a first direction, the exhaust hole extends along the first direction, and the plurality of first pressure relief mechanisms of the plurality of battery cells are arranged within the projection of the exhaust hole along its axial direction, and the first direction is perpendicular to the axial direction.

[0037] In the case where the battery includes a plurality of battery cells, the venting arrangement of the plurality of battery cells is achieved by aligning the extending direction of the vent hole with the arrangement direction of the plurality of battery cells.

[0038] In some embodiments, the channel structure includes a first channel extending along the first direction, and the exhaust hole connects the first channel and the first pressure relief mechanism.

[0039] The first channel converges the gas from the exhaust hole and guides the gas to be discharged from the box in a directional manner, which is conducive to directional control of the gas, reduces the probability of safety hazards, reduces the number of paths for gas to be discharged from the box, and simplifies the structural design of the box.

[0040] In some embodiments, the battery includes a plurality of battery packs arranged along the second direction, the battery packs include a plurality of the battery cells, and the first direction and the second direction are perpendicular; the channel structure includes a plurality of the first channels, and the first channels and the battery packs are arranged one to one.

[0041] In the case of multiple battery packs, multiple first channels are provided. One first channel can gather gas exhausted from multiple valves of multiple battery cells in one battery pack, thereby realizing exhaust arrangement of multiple battery packs.

[0042] In some embodiments, the channel structure includes a second channel, the second channel extends along the second direction, and a plurality of the first channels are connected to the second channel.

[0043] The second channel converges the gases from multiple first channels and guides the gases to be discharged from the box in a directional manner, which is conducive to directional control of the gas, reduces the probability of safety hazards, reduces the number of paths for gas to be discharged from the box, and simplifies the structural design of the box.

[0044] In some embodiments, the channel structure includes a third channel, the extension direction of the third channel is consistent with the axial direction of the exhaust hole, and a second pressure relief mechanism is provided at one end of the third channel away from the second channel; and the second pressure relief mechanism and the first pressure relief mechanism are provided on the same side of the exhaust hole.

[0045] The third channel extends along the axial direction of the exhaust hole, so that the second pressure relief mechanism and the first pressure relief mechanism can be arranged on the same side of the exhaust hole. The arrangement of the second pressure relief mechanism does not increase the size of the box along the axial direction of the exhaust hole, and does not increase the occupied volume of the box.

[0046] In some embodiments, the box body includes a main box body and a box cover, and the box cover includes a main cover member and a sub-cover member;

[0047] The main cover is disposed on the main box body, the main cover and the main box body together define a space for accommodating the battery cells, and the exhaust hole and the third channel are disposed on the main cover;

[0048] The auxiliary cover is arranged on a side of the main cover facing away from the main box body, and the auxiliary cover and the main cover jointly define the first channel and the second channel.

[0049] The first channel, the second channel and the third channel are designed by utilizing the main box body and the box cover of the box body itself, thereby simplifying the structural design of the box body.

[0050] In a second aspect, an electrical device is provided, wherein the electrical device includes the battery as described above.

[0051] The beneficial effect of the battery provided by the embodiment of the present application is that: in the battery provided by the present technical solution, the exhaust hole penetrates the box body along the thickness direction of the box body, and the first pressure relief mechanism is connected to the exhaust hole when in the open state. The gas discharged from the first pressure relief mechanism is discharged from the box body through the exhaust hole, and the outer space of the box body is used to cool and reduce the pressure of the gas, thereby reducing or eliminating the risk of gas explosion inside the box body, which is beneficial to improving the safety performance of the battery.

[0052] The beneficial effects of the electrical equipment provided by the embodiment of the present application are: the electrical device provided by this technical solution adopts the battery provided by the above technical solution, the battery provided by the above technical solution, the exhaust hole penetrates the box along the thickness direction of the box, the first pressure relief mechanism is connected to the exhaust hole when in the open state, the gas discharged from the first pressure relief mechanism is discharged from the box through the exhaust hole, and the outer space of the box is used to cool and reduce the pressure of the gas, thereby reducing or eliminating the risk of gas explosion inside the box, which is beneficial to improving the safety performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0054] FIG1 is a schematic structural diagram of an electrical device provided in some embodiments of the present application;

[0055] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0056] FIG3 is an exploded view of a battery provided in some embodiments of the present application;

[0057] FIG4 is a schematic diagram of the structure of a battery provided in some embodiments of the present application, wherein the cover portion is removed;

[0058] FIG5 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0059] FIG6 is a schematic structural diagram of a box from a perspective provided by some embodiments of the present application;

[0060] FIG7 is a schematic structural diagram of a box from another perspective provided by some embodiments of the present application;

[0061] FIG8 is an enlarged view of portion A in FIG7 ;

[0062] FIG9 is a schematic structural diagram of a box cover provided in some embodiments of the present application;

[0063] FIG10 is a schematic structural diagram of a secondary cover member from a perspective provided in some embodiments of the present application;

[0064] FIG11 is a schematic structural diagram of a secondary cover member from another perspective provided in some embodiments of the present application;

[0065] FIG12 is an exploded view of batteries provided in some other embodiments of the present application;

[0066] FIG13 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0067] FIG14 is a schematic structural diagram of a box cover provided in other embodiments of the present application;

[0068] FIG15 is a schematic structural diagram of a secondary cover member from a perspective provided in other embodiments of the present application;

[0069] FIG16 is a schematic structural diagram of a secondary cover member from another perspective provided in other embodiments of the present application;

[0070] FIG17 is an exploded view of batteries provided in some other embodiments of the present application;

[0071] FIG18 is a schematic structural diagram of a battery cell provided in yet other embodiments of the present application;

[0072] FIG19 is an exploded view of a battery provided in some further embodiments of the present application;

[0073] FIG20 is a schematic structural diagram of a battery cell provided in some further embodiments of the present application;

[0074] FIG21 is a schematic structural diagram of a box cover provided in some other embodiments of the present application;

[0075] FIG22 is a schematic structural diagram of a secondary cover member from a perspective provided in yet other embodiments of the present application;

[0076] FIG23 is a schematic structural diagram of a secondary cover member from another perspective provided in yet other embodiments of the present application;

[0077] FIG24 is an exploded view of a battery provided in some further embodiments of the present application;

[0078] FIG25 is a schematic structural diagram of a battery cell provided in some further embodiments of the present application;

[0079] FIG26 is a schematic structural diagram of a battery cell provided in some further embodiments of the present application.

[0080] Among them, the figure marks in the figure are: 10, battery; 100, electrical device; 101, controller; 102, motor; 11, box body; 12, battery pack; 13, isolation member; 14, second pressure relief mechanism; 120, battery cell; 111, main box body; 112, box cover; 1121, main cover member; 1122, auxiliary cover member; 1123, first channel; 1124, second channel; 1125, third channel; 1121a, exhaust hole; 121, shell; 122, first pressure relief mechanism; 123, electrode; 1231, positive electrode; 1232, negative electrode; a, first direction; b, second direction; c, axial direction. Modes for Carrying Out the Invention

[0081] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0082] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0083] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0085] Thermal runaway of a battery cell refers to the thermal runaway phenomenon of a battery cell caused by one or more factors. Thermal runaway causes the battery cell temperature to rise sharply, and simultaneously releases a large amount of heat and harmful gases, leading to the risk of detonating the battery.

[0086] For example, a process in which thermal runaway of a battery cell leads to spontaneous combustion or explosion of the battery is listed, which starts with the decomposition of the negative electrode SEI (Solid electrolyte interface) inside the battery cell, the diaphragm separating the negative electrode and the electrolyte decomposes and melts, the negative electrode reacts with the electrolyte, the positive electrode and the electrolyte decompose, causing a large-area short circuit inside the battery cell, resulting in the electrolyte being in a burning state, the battery cell thermal runaway, and the battery spontaneously combusting and detonating.

[0087] During the normal charging and discharging process of the battery cell, the electrolyte is filled between the positive electrode and the negative electrode of the battery cell. The directional movement of ions in the electrolyte and the directional movement of electrons in the external wires form a closed loop, so that the chemical reaction of the positive electrode and the negative electrode continues. The orderly electron transfer process generates current and realizes the conversion of chemical energy into electrical energy. Therefore, the positive electrode and the negative electrode need to be electrically connected to other electrical components.

[0088] On this basis, the interior of the box is generally equipped with one or more conductive structures or materials. In order to prevent the positive and negative electrodes of the battery cell from conducting electricity with these structures or materials and causing safety hazards, insulating structures or insulating materials are required for insulation isolation. Effective insulation performance must be ensured during the use of the battery, and sealing measures must be adopted in places where gas isolation is required.

[0089] Typically, battery cells are housed in a housing formed by a casing, which has a cavity in its walls. When a battery cell experiences thermal runaway, an explosion-proof valve diverts the gas inside the cell into the housing or cavity. Both the housing and cavity are internal to the casing, and their limited volume limits their ability to reduce the pressure and temperature of the gas. Insufficient pressure and temperature reduction can negatively impact the insulation and sealing designs, leading to battery short-circuit failures and negatively impacting battery safety.

[0090] Based on the above considerations, in order to reduce or eliminate the adverse effects of thermal runaway of the battery cell on the insulation design and sealing design inside the box body 11, so as to improve the safety performance of the battery 10, a battery 10 is provided, wherein the box body 11 is provided with an exhaust hole 1121a that penetrates the box body 11 along the thickness direction of the box body 11, and the battery cell 120 is accommodated in the box body 11; the battery cell 120 includes a shell 121, and a first pressure relief mechanism 122 and two electrodes 123 provided on the shell body 121, the first pressure relief mechanism 122 is connected to the exhaust hole 1121a and the interior of the shell body 121 when in an open state, and at least one of the two electrodes 123 and the first pressure relief mechanism 122 are provided on the same side of the shell body 121.

[0091] In the battery 10 provided by the present technical solution, the exhaust hole 1121a on the box body 11 penetrates the box body 11 along the thickness direction of the box body 11. The first pressure relief mechanism 122 is connected to the exhaust hole 1121a when in the open state. The gas discharged from the first pressure relief mechanism 122 is discharged from the box body 11 through the exhaust hole 1121a. The outer space of the box body 11 is used to cool and reduce the pressure of the gas, thereby reducing or eliminating the risk of gas explosion inside the box body 11, which is beneficial to improving the safety performance of the battery 10.

[0092] In some embodiments, a battery 10 refers to a physical module comprising one or more battery cells 120, which is used to provide voltage and capacitance. For example, it may include a battery cell 120, a battery module, a battery pack, etc. Generally, a battery includes a battery cell 120 and a housing 11 for housing the battery cell 120. The housing 11 is used to accommodate and encapsulate one or more battery cells 120 or battery modules. The housing 11 is used to protect the battery cells 120 and prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 120.

[0093] The battery cells 120 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the present application does not limit this. The battery cells 120 may be cylindrical, flat, rectangular, or other shapes, and the present application does not limit this. The battery cells 120 are divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the present application does not limit this.

[0094] As shown in Figure 2, a battery cell 120 is the smallest unit that makes up the battery 10. In the battery 10, there may be multiple battery cells 120, and these multiple battery cells 120 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 120. Multiple battery cells 120 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 120 may be housed within the housing 11. Alternatively, the battery 10 may be constructed by first connecting multiple battery cells 120 in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 11.

[0095] The housing 11 provides a storage space for the battery cells 120, and the housing 11 can adopt a variety of structures. In some embodiments, a housing 11 is exemplarily provided, and the housing 11 includes a main housing 111 and a housing cover 112. The main housing 111 and the housing cover 112 cover each other, and the main housing 111 and the housing cover 112 together define a storage space for the battery cells 120. The housing cover 112 can be a shell structure with an opening on one side, and the housing cover 112 can be a plate-shaped structure. The housing cover 112 covers the open side of the main housing 111, and the main housing 111 and the housing cover 112 together define a storage space. The main housing 111 and the housing cover 112 can also be shell structures with an opening on one side, and the open side of the main housing 111 covers the open side of the housing cover 112. Of course, the housing 11 formed by the main housing 111 and the housing cover 112 can be of various shapes, for example, a cylinder, a cuboid, etc.

[0096] The electric device 100 provided in the embodiment of the present application may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0097] 1 , the power-consuming device 100 may be a vehicle, which may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle, and the battery 10 may be provided at the bottom, head or tail of the vehicle. The battery 10 may be used to power the vehicle, for example, the battery 10 may be used as an operating power source for the vehicle. The vehicle may further include a controller 101 and a motor 102, and the controller 101 is used to control the battery 10 to power the motor 102, for example, for starting, navigating and driving the vehicle. In some embodiments, the battery 10 may serve not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0098] The battery 10 and the power-consuming device 100 provided in the embodiment of the present application are now described.

[0099] Referring to Figures 3 to 26 , the battery 10 provided in the embodiment of the present application includes a housing 11 and a battery cell 120. The housing 11 is provided with a vent 1121a extending through the thickness of the housing 11. The battery cell 120 includes a housing 121, a first pressure relief mechanism 122, and two electrodes 123 disposed on the housing 121. When the first pressure relief mechanism 122 is open, it connects the vent 1121a with the interior of the housing 121. At least one of the two electrodes 123 is disposed on the same side of the housing 121 as the first pressure relief mechanism 122.

[0100] The box body 11 refers to a component that can at least accommodate a battery cell 120, and also refers to a component that can arrange multiple battery cells 120 in an orderly manner, playing the role of support, protection, heat dissipation, fire prevention and explosion prevention. The box body 11 can form an accommodating space by enclosing multiple box walls from different sides, and the battery cell 120 is accommodated in the accommodating space. Generally, the box body 11 is a metal component, and the box wall includes one or more stacked metal plates. The metal plate refers to a plate-like structure of a metal material. The metal plate has a certain thickness and extended area, and the ratio of the extended area to the thickness is large. The exhaust hole 1121a penetrates the box wall along the thickness direction of the box wall, connecting the space where the first pressure relief mechanism 122 is located and the space outside the box wall.

[0101] A battery cell 120 is a single electrical core containing a positive electrode 1231 and a negative electrode 1232. As an electrical energy storage unit, a battery cell 120 is the smallest unit of the power battery 10. Taking a single lithium-ion battery 10 as an example, the operating voltage of a single lithium-ion battery 10 is between 3V and 5V. To meet the high voltage and high capacity requirements of an electrical device 100, multiple battery cells 120 are typically connected in series and parallel to form a battery 10, which then provides electrical energy to the electrical device 100.

[0102] The exhaust hole 1121a refers to a structure constructed on the box body 11 and penetrating the box wall along the thickness direction of the box wall of the box body 11. The exhaust hole 1121a is set to discharge the gas from the first pressure relief mechanism 122 when thermal runaway occurs inside the battery cell 120 and the first pressure relief mechanism 122 is in an open state. The first pressure relief mechanism 122 and the exhaust hole 1121a provide a path for the gas to be discharged from the inside of the battery cell 120 to the outside of the box body 11.

[0103] The housing 121 forms the outer contour of the battery cell 120 and contains a cavity containing an electrolyte. The electrolyte fills the space between the positive electrode 1231 and the negative electrode 1232 of the battery cell 120. The directional movement of ions in the electrolyte and electrons in the conductive wires form a closed circuit, enabling the chemical reaction between the positive electrodes 1231 and 2 to continue. This orderly electron transfer process generates current, converting chemical energy into electrical energy.

[0104] The first pressure relief mechanism 122 refers to a valve structure provided on the shell wall of the housing 121 and capable of being opened under set conditions. Generally, the first pressure relief mechanism 122 includes a valve body having a channel and a valve core provided in the channel and capable of moving relative to the valve body. The valve body is fixed to the shell wall of the housing 121. Under normal conditions, the valve core closes the channel of the valve body, and the first pressure relief mechanism 122 is in a blocking state. Under set conditions, the valve core moves relative to the valve body to open the channel, and the first pressure relief mechanism 122 is in an open state. For example, the first pressure relief mechanism 122 can be an explosion-proof valve, a one-way valve, or other valve structure. For example, the set condition can be at a set pressure or a set temperature, and the set condition is determined according to the type of the selected first pressure relief mechanism 122.

[0105] Electrodes 123 refer to the positive electrode 1231 and negative electrode 1232 of the battery cell 120. Generally, the positive electrode 1231 and negative electrode 1232 are located on the same side of the battery cell 120. As shown in FIG5 , the battery cell 120 utilizes a prismatic battery 10, with the positive electrode 1231 and negative electrode 1232 spaced apart on the top surface of the battery cell 120.

[0106] A first pressure relief mechanism 122 is provided on the side where the electrode 123 of the battery cell 120 is located. The first pressure relief mechanism 122 is connected to the exhaust hole 1121a to allow gas to be discharged from the box body 11. The installation of the electrode 123, other electrical components and connecting wires inside the box body 11 does not require sealing measures to prevent gas from entering the electrical compartment.

[0107] In some embodiments, one electrode 123 and the first pressure relief mechanism 122 may be located on the same side of the housing 121, while the other electrode 123 and the first pressure relief mechanism 122 may be located on different sides of the housing 121. For example, the negative electrode 1232 and the first pressure relief mechanism 122 may be located on opposite sides of the housing 121, with the side where the negative electrode 1232 is located and the side where the first pressure relief mechanism 122 is located separated by the battery cell 10 itself, further improving the safety performance of the battery 10.

[0108] In the battery 10 provided by the present technical solution, the exhaust hole 1121a on the box body 11 penetrates the thickness of the box body 11. The first pressure relief mechanism 122 is connected to the exhaust hole 1121a when in the open state. The gas exhausted from the first pressure relief mechanism 122 is discharged from the box body 11 through the exhaust hole 1121a. The outer space of the box body 11 is used to cool and reduce the pressure of the gas, thereby reducing or eliminating the risk of gas explosion inside the box body 11, which is beneficial to improving the safety performance of the battery 10.

[0109] In some embodiments, the battery 10 further includes an isolating member 13, which is connected between the box body 11 and the battery cell 120. One side of the isolating member 13 is isolated from the other side facing away from the other side. The first pressure relief mechanism 122 and the exhaust hole 1121a are provided on one side, and the electrode 123 on the same side as the first pressure relief mechanism 122 is provided on the other side.

[0110] The separator 13 is a component connected between the inner wall of the box body 11 and the surface of the battery cell 120 and capable of isolating the first pressure relief mechanism 122 from the electrode 123 and isolating the exhaust hole 1121 a from the electrode 123 .

[0111] The isolation member 13 can be a rigid member with higher hardness, such as a ceramic member, or a plastic member with lower hardness, such as a plastic member or a resin member, or a fluid material can be used to fill the space between the inside of the box 11 and the surface of the battery cell 120 and form the isolation member 13 after it solidifies.

[0112] In some embodiments, the spacer 13 and the inner wall of the box body 11 may be connected by gluing, and the spacer 13 and the surface of the battery cell 120 may be connected by gluing.

[0113] The isolation member 13 isolates the first pressure relief mechanism 122 and the electrode 123, and also isolates the exhaust hole 1121a and the electrode 123, isolating the path of gas discharged from the first pressure relief mechanism 122 to the exhaust hole 1121a from the electrode 123, preventing the gas from adversely affecting the electrode 123 and its insulation design.

[0114] In some embodiments, for a battery cell 120, the isolation member 13 can isolate the electrode 123 and the first pressure relief mechanism 122 thereon. For example, the isolation member 13 is annular, the first pressure relief mechanism 122 and the exhaust hole 1121a are arranged within the circumference defined by the isolation member 13, and at least one electrode 123 is arranged outside the circumference defined by the isolation member 13.

[0115] For multiple battery cells 120, the battery includes multiple separators 13, multiple first pressure relief mechanisms 122 are respectively disposed within the circumference of the multiple separators 13, multiple vent holes 1121a are respectively disposed within the circumference of the multiple separators 13, and multiple electrodes 123 are disposed outside the circumference of the multiple separators 13. Alternatively, the battery includes one separator 13, multiple first pressure relief mechanisms 122 are disposed within the circumference of the single separator 13, multiple vent holes 1121a are disposed within the circumference of the single separator 13, and multiple electrodes 123 are disposed outside the circumference of the single separator 13.

[0116] In other embodiments, for a battery cell 120, the isolation member 13 can isolate the electrode 123 and the first pressure relief mechanism 122 thereon. For example, the isolation member 13 is strip-shaped, the first pressure relief mechanism 122 and the exhaust hole 1121a are arranged on one side of the isolation member 13, and the electrode 123 is arranged on the other side of the isolation member 13.

[0117] For multiple battery cells 120, the battery includes multiple isolation members 13, which are connected in sequence to form an integrated structure, multiple first pressure relief mechanisms 122 and multiple exhaust holes 1121a are arranged on the same side of the isolation member 13, and multiple electrodes 123 are arranged on the other side of the isolation member 13.

[0118] As shown in Figures 3 and 12, in some embodiments, the first pressure relief mechanism 122 and the two electrodes 123 are arranged on the same side of the shell 121, and the first pressure relief mechanism 122 is arranged between the two electrodes 123; an isolation member 13 is provided between the first pressure relief mechanism 122 and one electrode 123, and an isolation member 13 is provided between the first pressure relief mechanism 122 and the other electrode 123.

[0119] When the first pressure relief mechanism 122 and the two electrodes 123 are arranged on the same side of the shell 121, an isolation member 13 is used to isolate one electrode 123 from the first pressure relief mechanism 122, and another isolation member 13 is used to isolate the other electrode 123 from the first pressure relief mechanism 122. The two electrodes 123 are isolated separately, and the path of the gas discharged from the first pressure relief mechanism 122 to the exhaust hole 1121a is isolated from any electrode 123, preventing the gas from causing adverse effects on any electrode 123 and its insulation design.

[0120] As shown in FIG3 , in some embodiments, the first pressure relief mechanism 122 is disposed at a central position between two electrodes 123 . The two electrodes 123 are a positive electrode 1231 and a negative electrode 1232 .

[0121] The first pressure relief mechanism 122 is spaced consistently from the two electrodes 123 . The space between the first pressure relief mechanism 122 and any electrode 123 is sufficient to facilitate provision of an isolation member 13 between the first pressure relief mechanism 122 and any electrode 123 .

[0122] In some embodiments, the battery 10 includes multiple battery packs 12, which are arranged along the second direction b. Each battery pack 12 includes multiple battery cells 120, which are stacked along the first direction a. On each battery cell 120, a first pressure relief mechanism 122 is located centered between two electrodes 123 along the second direction b. In each battery pack 12, multiple first pressure relief mechanisms 122 are arranged in a group along the first direction a, with each group of first pressure relief mechanisms 122 located centered within the battery pack 12 along the second direction b.

[0123] The housing 11 is provided with a plurality of exhaust holes 1121a, the plurality of exhaust holes 1121a are arranged along the first direction a, and the exhaust holes 1121a and the first pressure relief mechanisms 122 are arranged one-to-one. Alternatively, the housing 11 is provided with a single exhaust hole 1121a, one exhaust hole 1121a extending along the first direction a, and the exhaust hole 1121a and the plurality of first pressure relief mechanisms 122 are arranged one-to-many.

[0124] Taking the box body 11 with multiple exhaust holes 1121a as an example, an isolation member 13 extends in a strip shape along the first direction a. The isolation member 13 is connected to multiple battery cells 120, multiple first pressure relief mechanisms 122 and multiple exhaust holes 1121a are arranged on one side, and multiple positive electrodes 1231 are arranged on the other side.

[0125] Another separator 13 extends in a strip shape along the first direction a. The separator 13 is connected to the plurality of battery cells 120 . The plurality of first pressure relief mechanisms 122 and the plurality of exhaust holes 1121 a are provided on one side, and the plurality of negative electrodes 1232 are provided on the other side.

[0126] As shown in FIG. 12 , in some embodiments, the first pressure relief mechanism 122 is adjacent to one electrode 123 and away from the other electrode 123 .

[0127] Another arrangement of the first pressure relief mechanism 122 is provided, which is suitable for an arrangement requirement in which the distance between one electrode 123 and the first pressure relief mechanism 122 needs to be greater than the distance between the other electrode 123 and the first pressure relief mechanism 122 .

[0128] In some embodiments, the battery 10 includes a plurality of battery packs 12, and the plurality of battery packs 12 are arranged along the second direction b. Each battery pack 12 includes a plurality of battery cells 120, and the plurality of battery cells 120 are stacked along the first direction a. On each battery cell 120, a first pressure relief mechanism 122 is provided at a position adjacent to the negative electrode 1232 of the two electrodes 123 along the second direction b. In each battery pack 12, any two adjacent battery cells 120 are arranged oppositely along the second direction b, and two groups of first pressure relief mechanisms 122 are arranged along the second direction b, each group including a plurality of first pressure relief mechanisms 122 arranged along the first direction a. Then, one group of first pressure relief mechanisms 122 is separated from the electrode 123 on the adjacent side by a strip-shaped separator 13, and the other group of first pressure relief mechanisms 122 is separated from the electrode 123 on the adjacent side by another strip-shaped separator 13.

[0129] In some other embodiments, the battery cells 120 include two types. In one type of battery cell 120, the first pressure relief mechanism 122 is provided at a position adjacent to the negative electrode 1232 between the two electrodes 123 along the second direction b. In another type of battery cell 120, the first pressure relief mechanism 122 is provided at a position adjacent to the positive electrode 1231 between the two electrodes 123 along the second direction b.

[0130] The battery 10 includes a plurality of battery packs 12, which are arranged along a second direction b. Each battery pack 12 includes a plurality of battery cells 120, which are stacked along a first direction a, and the two types of batteries are arranged alternately along the first direction a. In each battery pack 12, a group of first pressure relief mechanisms 122 is arranged along the second direction b. The group includes a plurality of first pressure relief mechanisms 122 arranged along the first direction a. The group of first pressure relief mechanisms 122 is separated from the positive electrode 1231 on the adjacent side by a strip-shaped separator 13, and the group of first pressure relief mechanisms 122 is separated from the negative electrode 1232 on the adjacent side by another strip-shaped separator 13.

[0131] 17 , 19 , and 24 , in some embodiments, the first pressure relief mechanism 122 and the two electrodes 123 are disposed on the same side of the shell 121 , the first pressure relief mechanism 122 and the two electrodes 123 are disposed sequentially, and an isolation member 13 is provided between the first pressure relief mechanism 122 and the adjacent electrode 123 .

[0132] Another arrangement of the first pressure relief mechanism 122 is provided, which is suitable for the arrangement requirement that the first pressure relief mechanism 122 is arranged on a side of the battery cell 120 and the two electrodes 123 are arranged on another side or in the middle area.

[0133] As shown in FIG17 , in some embodiments, the first pressure relief mechanism 122 and the two electrodes 123 are disposed on the same side of the housing 121, and are disposed sequentially. Furthermore, the two electrodes 123 are disposed in the center of the battery cell 120 along the second direction b. That is, the two electrodes 123 can be symmetrically disposed about the center of the battery cell 120 along the second direction b. The first pressure relief mechanism 122 is disposed on the outer side of any electrode 123 along the second direction b. A separator 13 is disposed between the first pressure relief mechanism 122 and the adjacent electrode 123.

[0134] As an example, the first pressure relief mechanism 122 may be provided on the outer side of the positive electrode 1231 or the negative electrode 1232 along the second direction b. As shown in FIG18 , the first pressure relief mechanism 122 is provided on the outer side of the negative electrode 1232 along the second direction b.

[0135] In some embodiments, the battery 10 includes multiple battery packs 12, which are arranged along the second direction b. Each battery pack 12 includes multiple battery cells 120, which are stacked along the first direction a. On each battery cell 120, two electrodes 123 are disposed at the center of the battery cell 120 along the second direction b, and the first pressure relief mechanism 122 is disposed on the outer side of the negative electrode 1232 along the second direction b. In each battery pack 12, any two adjacent battery cells 120 are disposed opposite each other along the second direction b. Two groups of first pressure relief mechanisms 122 are disposed along the second direction b, and the two groups of first pressure relief mechanisms 122 are disposed outside the two electrodes 123. Each group includes multiple first pressure relief mechanisms 122 arranged along the first direction a. A group of first pressure relief mechanisms 122 located on one outer side is separated from the electrode 123 adjacent thereto by a strip-shaped isolating member 13, and another group of first pressure relief mechanisms 122 located on another outer side is separated from the electrode 123 on the adjacent side by another strip-shaped isolating member 13.

[0136] As shown in FIG19 , in some embodiments, the first pressure relief mechanism 122 and the two electrodes 123 are disposed on the same side of the housing 121 , and the first pressure relief mechanism 122 and the two electrodes 123 are disposed sequentially. Furthermore, one of the two electrodes 123 is disposed on one side of the battery cell 120 along the second direction b, the first pressure relief mechanism 122 is disposed on the other side of the battery cell 120 along the second direction b, and the other of the two electrodes 123 is disposed in the middle region, closer to the first pressure relief mechanism 122 .

[0137] As an example, as shown in Figure 20, the positive electrode 1231 is arranged on one side of the battery cell 120 along the second direction b, the first pressure relief mechanism 122 is arranged on the other side of the battery cell 120 along the second direction b, and the negative electrode 1232 is arranged in the middle area, and the negative electrode 1232 is closer to the first pressure relief mechanism 122.

[0138] In some embodiments, the battery 10 includes multiple battery packs 12, arranged along a second direction b. Each battery pack 12 includes multiple battery cells 120, stacked along a first direction a. On each battery cell 120, a positive electrode 1231 is disposed on one side of the battery cell 120 along the second direction b, a first pressure relief mechanism 122 is disposed on another side of the battery cell 120 along the second direction b, and a negative electrode 1232 is disposed in the middle region, with the negative electrode 1232 being closer to the first pressure relief mechanism 122. In each battery pack 12, any two adjacent battery cells 120 are arranged in opposite directions along the second direction b. Two groups of first pressure relief mechanisms 122 are arranged along the second direction b, each group comprising multiple first pressure relief mechanisms 122 arranged along the first direction a. In this embodiment, each first pressure relief mechanism can be isolated by an annular spacer 13, or the spacer 13 can extend along the periphery of the multiple first pressure relief mechanisms 122 along the first direction a, avoiding adjacent electrodes 123.

[0139] As shown in FIG24 , in some embodiments, the first pressure relief mechanism 122 and the two electrodes 123 are disposed on the same side of the housing 121, and are disposed sequentially. Furthermore, the two electrodes 123 are disposed on one side of the battery cell 120 along the second direction b. That is, the two electrodes 123 are spaced apart and closer to one of the sides, while the first pressure relief mechanism 122 is disposed on the other outer side along the second direction b. A separator 13 is disposed between the first pressure relief mechanism 122 and the adjacent electrode 123.

[0140] As an example, as shown in FIG. 25 and FIG. 26 , the battery cells 120 may include two types. In one type of battery cell 120 , the positive electrode 1231 is closer to the first pressure relief mechanism 122 , while in the other type of battery cell 120 , the negative electrode 1232 is closer to the first pressure relief mechanism 122 .

[0141] In some embodiments, the battery 10 includes multiple battery packs 12, arranged along a second direction b. Each battery pack 12 includes multiple battery cells 120, stacked along a first direction a. Two electrodes 123 are provided on one side of the battery cell 120 along the second direction b, while a first pressure relief mechanism 122 is provided on the other outer side along the second direction b. The battery cells 120 may include two types: in one type of battery cell 120, the positive electrode 1231 is closer to the first pressure relief mechanism 122, while in another type of battery cell 120, the negative electrode 1232 is closer to the first pressure relief mechanism 122. In each battery pack 12, one type of battery 10 and another type of battery 10 are alternately stacked along the first direction a. A group of first pressure relief mechanisms 122 is arranged along the second direction b, with the group comprising multiple first pressure relief mechanisms 122 arranged along the first direction a. The group of first pressure relief mechanisms 122 is separated from the adjacent electrodes 123 by a strip-shaped separator 13.

[0142] In some embodiments, the battery 10 includes a plurality of battery cells 120 , which are stacked along a first direction a. Any two adjacent battery cells 120 are oppositely positioned along a second direction b. The first direction a and the second direction b are perpendicular.

[0143] Opposite arrangement means that the positive electrodes 1231 and negative electrodes 1232 of two adjacent battery cells 120 are opposite to each other along the second direction b. For example, the battery 10 shown in Figures 3, 12, 17, and 19 includes a type of battery cell 120, wherein the plurality of battery cells 120 are stacked in sequence along the first direction a, and the positive electrodes 1231 and negative electrodes 1232 of two adjacent battery cells 120 are opposite to each other along the second direction b.

[0144] Any two adjacent battery cells 120 are placed oppositely along the second direction b to form one or two groups of first pressure relief mechanisms 122 spaced apart along the second direction b, each group including multiple first pressure relief mechanisms 122 arranged along the first direction a, which is conducive to the layout and arrangement of the first pressure relief mechanisms 122 according to the internal space of the battery 10.

[0145] In some embodiments, the battery 10 includes a plurality of battery cells 120 , which are stacked along a first direction a. Any two adjacent battery cells 120 are placed in the same direction along a second direction b. The first direction a and the second direction b are perpendicular.

[0146] Identical placement means that the first pressure relief mechanisms 122 of two adjacent battery cells 120 are located on the same side. For example, identical placement can be used for two battery cells 120, where the first pressure relief mechanisms 122 of the two battery cells 120 are located on one side of the battery cell 120 along the second direction b, and the positive electrode 1231 and the negative electrode 1232 are located on the other side of the battery cell 120 along the second direction b. For example, the battery 10 shown in FIG24 includes two battery cells 120, which are alternately stacked along the first direction a. The two first pressure relief mechanisms 122 of the two adjacent battery cells 120 are located on one side of the battery cell 120 along the second direction b, and the positive electrode 1231 and the negative electrode 1232 of the two adjacent battery cells 120 are located on the other side of the battery cell 120 along the second direction b.

[0147] Any two adjacent battery cells 120 placed identically along the second direction b can form a group of multiple first pressure relief mechanisms 122 arranged along the first direction a, which facilitates the layout of the first pressure relief mechanisms 122 according to the internal space of the battery 10 .

[0148] In some embodiments, the isolation member 13 extends along the first direction a, and the isolation member 13 is connected to the plurality of battery cells 120 .

[0149] The plurality of battery cells 120 are isolated from the electrodes 123 by a first pressure relief mechanism 122 and the exhaust holes 1121 a through one isolating member 13 , thereby simplifying the internal structure of the battery 10 .

[0150] In other embodiments, the isolating member 13 is annular, the first pressure relief mechanism 122 and the exhaust hole 1121 a are disposed within the circumference defined by the isolating member 13 , and the at least one electrode 123 is disposed outside the circumference defined by the isolating member 13 .

[0151] In some embodiments, the spacing distance between the isolating member 13 and the adjacent electrode 123 is greater than or equal to 35 mm, and the dimension of the isolating member 13 in the direction of the isolating member 13 pointing to the adjacent electrode 123 is greater than or equal to 4 mm and less than or equal to the spacing distance between the isolating member 13 and the adjacent electrode 123.

[0152] In the direction of the isolating member 13 pointing to the adjacent electrode 123, the size of the isolating member 13 is greater than or equal to 4 mm and less than or equal to the distance between the isolating member 13 and the adjacent electrode 123. While achieving the isolation effect, the connection strength between the isolating member 13 and the box body 11 and the battery cell 120 can be improved.

[0153] In some embodiments, the dimension of the spacer 13 in the direction from the box body 11 to the battery cell 120 is greater than or equal to 0.3 mm.

[0154] In the direction from the box body 11 to the battery cell 120 , the size of the spacer 13 is greater than or equal to 0.3 mm, which can improve the connection strength between the spacer 13 and the box body 11 and the battery cell 120 while achieving the isolation function.

[0155] In some embodiments, the housing 11 is provided with a channel structure, and the channel structure and the first pressure relief mechanism 122 are provided on both sides of the exhaust hole 1121 a in the axial direction c, and the exhaust hole 1121 a is communicated with the channel structure.

[0156] The channel structure refers to a channel-type structure provided on the box body 11 and located outside the exhaust hole 1121a, having a certain caliber for gas to pass through and a certain length for directional guidance of the gas, and a large ratio of length to caliber.

[0157] The channel structure guides the gas to be discharged from the box body 11 in a directional manner, which is beneficial for directional control of the gas, reduces the probability of occurrence of safety hazards, reduces the number of paths for gas to be discharged from the box body 11, and simplifies the structural design of the box body 11.

[0158] In some embodiments, the box body 11 is provided with a second pressure relief mechanism 14 , which is provided at one end of the channel structure away from the exhaust hole 1121 a . The second pressure relief mechanism 14 connects the channel structure and the outside of the box body 11 when open.

[0159] The second pressure relief mechanism 14 refers to a valve structure provided on the shell wall of the housing 121 and capable of being opened under set conditions. Generally, the second pressure relief mechanism 14 includes a valve body having a channel and a valve core provided in the channel and capable of moving relative to the valve body. The valve body is fixed on the shell wall of the housing 121. Under normal conditions, the valve core closes the channel of the valve body, and the second pressure relief mechanism 14 is in a blocking state. Under set conditions, the valve core moves relative to the valve body to open the channel, and the second pressure relief mechanism 14 is in an open state. For example, the second pressure relief mechanism 14 can be an explosion-proof valve, a one-way valve, or other valve structures. For example, the set condition can be at a set pressure or a set temperature, and the set condition is determined according to the type of the selected second pressure relief mechanism 14.

[0160] A second pressure relief mechanism 14 is provided at the end of the channel structure to facilitate directional discharge of gas and reduce the probability of potential safety hazards.

[0161] In some embodiments, the battery 10 includes a plurality of battery cells 120 stacked along a first direction a, the box body 11 is provided with a plurality of exhaust holes 1121a arranged along the first direction a, the plurality of exhaust holes 1121a are respectively connected to the channel structure, and the first pressure relief mechanism 122 is arranged one-to-one with the exhaust holes 1121a.

[0162] When the battery 10 includes a plurality of battery cells 120 , a plurality of vent holes 1121 a are provided, and the arrangement direction of the plurality of vent holes 1121 a is made consistent with the arrangement direction of the plurality of battery cells 120 , thereby achieving venting arrangement of the plurality of battery cells 120 .

[0163] As an example, the first direction a refers to the length direction of the battery 10, the second direction b refers to the width direction of the battery 10, and the axial direction c of the exhaust hole 1121a is the height direction of the battery 10. The first direction a, the second direction b and the height direction are perpendicular to each other.

[0164] In some embodiments, as shown in Figure 1, the box body 11 has a length along the first direction a, the battery cell 120 has a thickness along the first direction a, the box body 11 and the battery cell 120 both have a height along the axial direction c, the multiple exhaust holes 1121a are arranged in sequence along the length direction of the box body 11, the multiple battery cells 120 are stacked in sequence along the length direction of the box body 11, the height of the multiple exhaust holes 1121a is higher than the height of the multiple battery cells 120, and the multiple exhaust holes 1121a and the multiple first pressure relief mechanisms 122 are arranged one to one along the height direction of the box body 11.

[0165] The position of the vent 1121a on the housing 11 can be selected based on the position of the first pressure relief mechanism 122 on the battery cell 120. For example, the housing 11 has a width along the second direction b. The design position of the first pressure relief mechanism 122 relative to the battery cell 120 can be changed along the width of the housing 11. The design position of the vent 1121a can also be changed accordingly. The vent 1121a and the first pressure relief mechanism 122 are preferably aligned along the height of the housing 11. Alignment means that the central axis of the vent 1121a and the central axis of the first pressure relief mechanism 122 are approximately aligned.

[0166] Of course, if the number of first pressure relief mechanisms 122 on a battery cell 120 is not limited to one, the number of vents 1121a can be increased accordingly. The arrangement direction of the multiple first pressure relief mechanisms 122 on a battery cell 120 can be selected arbitrarily, and the arrangement direction of the vents 1121a can be arranged in the same direction as the arrangement direction of the multiple first pressure relief mechanisms 122.

[0167] As an example, two first pressure relief mechanisms 122 arranged along the width direction of the box body 11 are provided on the top surface of one battery cell 120 . Correspondingly, the box body 11 is provided with two exhaust holes 1121 a arranged along the width direction thereof.

[0168] Within the battery cells 120, two sets of first pressure relief mechanisms 122 are spaced apart along the width of the housing 11, with each set comprising multiple first pressure relief mechanisms arranged along a first direction a. Correspondingly, two sets of vent holes 1121a are spaced apart along the width of the housing 11, with the two sets of first pressure relief mechanisms 122 and the two sets of vent holes arranged one-to-one.

[0169] In some embodiments, unlike the solution in which the battery cell 120 has a thickness along the length direction of the box body 11 and multiple battery cells 120 are stacked along the length direction of the box body 11, the battery cell 120 has a length along the width direction of the box body 11 and multiple battery cells 120 are arranged in sequence along the width direction of the box body 11, then multiple exhaust holes 1121a can be arranged in sequence along the width direction of the box body 11.

[0170] When the battery includes a plurality of battery cells 120 , a plurality of vent holes 1121 a are provided, and the arrangement direction of the plurality of vent holes 1121 a is made consistent with the arrangement direction of the plurality of battery cells 120 , thereby achieving venting arrangement of the plurality of battery cells 120 .

[0171] In some embodiments, the battery 10 includes a plurality of battery cells 120 stacked along a first direction a, the exhaust hole 1121a extends along the first direction a, and the plurality of first pressure relief mechanisms 122 of the plurality of battery cells 120 are arranged within the projection of the exhaust hole 1121a along its axial direction c, and the first direction a is perpendicular to the axial direction c.

[0172] In the case where the battery 10 includes a plurality of battery cells 120 , the venting arrangement of the plurality of battery cells 120 is achieved by aligning the extending direction of the vent holes 1121 a with the arrangement direction of the plurality of battery cells 120 .

[0173] As an example, the first direction a refers to the length direction of the battery 10, the second direction b refers to the width direction of the battery 10, and the axial direction c of the exhaust hole 1121a is the height direction of the battery 10. The first direction a, the second direction b and the height direction are perpendicular to each other.

[0174] In some embodiments, the box body 11 has a length along the first direction a, the battery cell 120 has a thickness along the first direction a, and the exhaust hole 1121a extends a length along the length direction of the box body 11. At this time, the exhaust hole 1121a is in a strip shape, and multiple battery cells 120 are stacked in sequence along the length direction of the box body 11. The height of the exhaust hole 1121a is higher than the height of multiple battery cells 120, and one exhaust hole 1121a and multiple first pressure relief mechanisms 122 are arranged opposite each other along the height direction of the box body 11.

[0175] The position of the vent 1121a on the housing 11 can be selected based on the position of the first pressure relief mechanism 122 on the battery cell 120. For example, the housing 11 has a width along the third direction, and the design position of the first pressure relief mechanism 122 relative to the battery cell 120 can be changed along the width of the housing 11. The design position of the vent 1121a can also be changed accordingly. The projection of one vent 1121a along the height direction of the housing 11 can accommodate multiple first pressure relief mechanisms 122 as much as possible.

[0176] In some embodiments, unlike the solution in which the battery cell 120 has a thickness along the length direction of the box body 11 and multiple battery cells 120 are stacked along the length direction of the box body 11, the battery cell 120 has a length along the width direction of the box body 11 and multiple battery cells 120 are arranged in sequence along the width direction of the box body 11, then the exhaust hole 1121a can be extended along the width direction of the box body 11.

[0177] In the case where the battery includes a plurality of battery cells 120 , the venting arrangement of the plurality of battery cells 120 is achieved by aligning the extending direction of the vent holes 1121 a with the arrangement direction of the plurality of battery cells 120 .

[0178] In some embodiments, the channel structure includes a first channel 1123 extending along a first direction a, and the exhaust hole 1121 a connects the first channel 1123 and the first pressure relief mechanism 122 .

[0179] First channel 1123 is a channel structure provided on housing 11 and located outside exhaust holes 1121a. It has a certain diameter for gas to pass through and a certain length for directional gas flow, with a large ratio of length to diameter. First channel 1123 is used to flow gas from multiple exhaust holes 1121a.

[0180] The first channel 1123 converges the gas from the exhaust hole 1121a and guides the gas to be discharged from the box body 11 in a directional manner, which is conducive to directional control of the gas, reduces the probability of safety hazards, reduces the number of paths for gas to be discharged from the box body 11, and simplifies the structural design of the box body 11.

[0181] In some embodiments, as shown in FIG1 , the housing 11 has a length along a first direction a, and the battery cells 120 have a thickness along the first direction a. The first channel 1123 extends along the length of the housing 11, and the battery cells 120 are stacked along the length of the housing 11. The plurality of vent holes 1121a are sequentially arranged along the length of the housing 11, or the vent holes 1121a extend along the length of the housing 11, the height of the vent holes 1121a is lower than the height of the first channel 1123, the plurality of vent holes 1121a are located within a projection of a first channel 1123 along the height of the housing 11, or a strip-shaped vent hole 1121a is located within a projection of a first channel 1123 along the height of the housing 11.

[0182] In some embodiments, unlike the solution in which the battery cell 120 has a thickness along the length direction of the box body 11 and multiple battery cells 120 are stacked along the length direction of the box body 11, the battery cell 120 has a length along the width direction of the box body 11 and multiple battery cells 120 are arranged in sequence along the width direction of the box body 11. Then, the strip-shaped exhaust hole 1121a can be extended along the width direction of the box body 11, or multiple exhaust holes 1121a are arranged in sequence along the width direction of the box body 11, and then the first channel 1123 can be extended along the width direction of the box body 11.

[0183] The extension direction of the first channel 1123 is consistent with the arrangement direction of the multiple exhaust holes 1121a. The multiple exhaust holes 1121a are arranged in the projection of the first channel 1123 along the second direction b. The layout of the first channel 1123 and the multiple exhaust holes 1121a is simpler, which is conducive to simplifying the structural design of the box body 11.

[0184] In some embodiments, the battery 10 includes a plurality of battery packs 12 arranged along the second direction b, the battery pack 12 includes a plurality of battery cells 120, the first direction a and the second direction b are perpendicular; the channel structure includes a plurality of first channels 1123, and the first channels 1123 and the battery packs 12 are arranged one to one.

[0185] The battery pack 12 is a grouping of multiple battery cells 120 contained in the battery 10 . The multiple battery cells 120 in each group have the same arrangement direction. Each battery pack 12 includes at least two battery cells 120 .

[0186] In the case of multiple battery packs 12 , multiple first channels 1123 are provided. One first channel 1123 can gather gas exhausted from multiple valves of multiple battery cells 120 of one battery pack 12 , thereby realizing exhaust arrangement of multiple battery packs 12 .

[0187] In some embodiments, as shown in FIG1 , the battery cells 120 have a thickness along the length of the housing 11, and multiple battery cells 120 are stacked along the length of the housing 11 to form a battery pack 12. Then, a strip-shaped exhaust hole 1121a extends along the length of the housing 11, or multiple exhaust holes 1121a are arranged sequentially along the length of the housing 11, with the exhaust holes 1121a located at a height lower than the first channel 1123, and the multiple exhaust holes 1121a are located within the projection of a first channel 1123 along the height of the housing 11, or a strip-shaped exhaust hole 1121a is located within the projection of a first channel 1123 along the height of the housing 11.

[0188] In some embodiments, unlike the solution in which the battery cells 120 have a thickness along the length of the housing 11 and multiple battery cells 120 are stacked along the length of the housing 11, the battery cells 120 have a length along the width of the housing 11 and multiple battery cells 120 are arranged sequentially along the width of the housing 11 to form a battery pack 12. In this case, the strip-shaped exhaust holes 1121a extend along the width of the housing 11, or the multiple exhaust holes 1121a are arranged sequentially along the width of the housing 11, with the height of the exhaust holes 1121a being lower than the height of the first channel 1123, and the multiple exhaust holes 1121a being located within the projection of a first channel 1123 along the height of the housing 11, or the single strip-shaped exhaust hole 1121a being located within the projection of a first channel 1123 along the height of the housing 11.

[0189] When the battery includes multiple battery packs 12 , multiple first channels 1123 are provided. One first channel 1123 can gather gas exhausted from multiple valves of multiple battery cells 120 of one battery pack 12 , thereby realizing exhaust configuration of multiple battery packs 12 .

[0190] In some embodiments, the channel structure includes a second channel 1124 , the second channel 1124 extends along the second direction b, and the plurality of first channels 1123 are all connected to the second channel 1124 .

[0191] Second channel 1124 is a channel structure provided on housing 11 and connected to first channel 1123. It has a certain diameter for gas to pass through and a certain length for directional gas flow, with a large ratio of length to diameter. Second channel 1124 is used to flow gas from multiple first channels 1123.

[0192] The second channel 1124 converges the gases from the multiple first channels 1123 and guides the gases to be discharged from the box 11 in a directional manner, which is conducive to directional control of the gas, reduces the probability of safety hazards, reduces the number of paths for gas to be discharged from the box 11, and simplifies the structural design of the box 11.

[0193] In some embodiments, as shown in FIG1 , the battery cell 120 has a thickness along the length direction of the box body 11 and multiple battery cells 120 are stacked along the length direction of the box body 11 , then the first channel 1123 extends along the length direction of the box body 11 , and the second channel 1124 extends along the width direction of the box body 11 .

[0194] In some embodiments, unlike the solution in which the battery cell 120 has a thickness along the length direction of the box body 11 and multiple battery cells 120 are stacked along the length direction of the box body 11, the battery cell 120 has a length along the width direction of the box body 11 and multiple battery cells 120 are arranged in sequence along the width direction of the box body 11, then the first channel 1123 extends along the width direction of the box body 11, the second channel 1124 extends along the length direction of the box body 11, and the second channel 1124 is provided on the same end of the multiple first channels 1123 along the width direction of the box body 11 and is connected to the multiple first channels 1123.

[0195] In some embodiments, the channel structure includes a third channel 1125, the extension direction of the third channel 1125 is consistent with the axial direction c of the exhaust hole 1121a, and a second pressure relief mechanism 14 is provided at one end of the third channel 1125 away from the second channel 1124; and the second pressure relief mechanism 14 and the first pressure relief mechanism 122 are provided on the same side of the exhaust hole 1121a.

[0196] The third channel 1125 is a channel structure provided on the housing 11 and connected to the second channel 1124. It has a certain diameter for gas to pass through and a certain length for directional gas flow, with the ratio of length to diameter approaching 1. The third channel 1125 is used to allow gas from the second channel 1124 to flow through.

[0197] The third channel 1125 extends along the axial direction c of the exhaust hole 1121a, so that the second pressure relief mechanism 14 and the first pressure relief mechanism 122 can be arranged on the same side of the exhaust hole 1121a. The setting of the second pressure relief mechanism 14 does not increase the size of the box body 11 along the axial direction c of the exhaust hole 1121a, and does not increase the occupied volume of the box body 11.

[0198] As an example, as shown in FIG1 , FIG7 and FIG8 , the third channel 1125 may adopt a sink structure, formed by stretching the second channel 1124 along the height direction, and a second pressure relief mechanism 14 is installed at the bottom of the sink.

[0199] The other end of third channel 1125 is located away from second channel 1124, meaning that second pressure relief mechanism 14 is positioned lower than second channel 1124. The provision of second pressure relief mechanism 14 does not increase the dimensions of housing 11 along second direction b, nor does it increase the volume occupied by housing 11. Furthermore, after converging with first channel 1123 and second channel 1124, gas is discharged through a single second pressure relief mechanism 14, reducing the number of second pressure relief mechanisms 14 and lowering the manufacturing cost of housing 11.

[0200] Of course, in other embodiments, the second pressure relief mechanism 14 may be provided at the extended end of the first channel 1123 or at the extended end of the second channel 1124 .

[0201] In some embodiments, the first channel 1123 and the third channel 1125 are disposed on both sides of the second channel 1124 along the first direction a.

[0202] In some embodiments, as shown in FIG1 , the first channel 1123 extends along the length of the housing 11, the second channel 1124 extends along the width of the housing 11, and the third channel 1125 is located in the center of the second channel 1124. The third channel 1125 is located on a side of the second channel 1124 away from the first channel 1123. Alternatively, the third channel 1125 is located at one end of the second channel 1124 in the length direction.

[0203] In some embodiments, the first channel 1123 extends along the width of the housing 11, the second channel 1124 extends along the length of the housing 11, and the third channel 1125 is located in the center of the second channel 1124. The third channel 1125 is located on a side of the second channel 1124 away from the first channel 1123. Alternatively, the third channel 1125 is located at one end of the second channel 1124 in the length direction.

[0204] The gas enters the first channel 1123 from the exhaust hole 1121a, enters the second channel 1124 from the first channel 1123, and enters the third channel 1125 from the second channel 1124. The gas generally flows along the first direction a and is discharged from the box body 11 from one side of the first direction a, which is conducive to directional control of the gas and reduces the probability of safety hazards.

[0205] 8 to 11, 14 to 16, and 21 to 23, in some embodiments, the housing 11 includes a main housing 111 and a housing cover 112. The housing cover 112 includes a main cover member 1121 and a sub-cover member 1122. The main cover member 1121 is disposed on the main housing 111. The main cover member 1121 and the main housing 111 together define a space for accommodating the battery cells 120. The vent 1121a and the third channel 1125 are disposed on the main cover member 1121. The sub-cover member 1122 is disposed on a side of the main cover member 1121 facing away from the main housing 111. The sub-cover member 1122 and the main cover member 1121 together define a first channel 1123 and a second channel 1124.

[0206] Among them, the boxes provided in Figures 8 to 11 include but are not limited to the batteries provided in Figures 3 and 4, the boxes provided in Figures 14 to 16 include but are not limited to the batteries provided in Figure 13, and the boxes provided in Figures 21 to 23 include but are not limited to the batteries provided in Figures 17 and 19.

[0207] The main housing 111 is a component that has at least a storage space for the battery cells 120 and an opening that allows the battery cells 120 to enter and exit the storage space. It also refers to the component that allows multiple battery cells 120 to be arranged in an orderly manner, providing support, protection, heat dissipation, and fire and explosion protection. The main housing 111 can be formed by multiple walls, excluding the cover 112, from different sides to form a storage space, and the battery cells 120 are housed in the storage space.

[0208] The box cover 112 is a component that covers the opening of the main box body 111 and is provided with an exhaust hole 1121a, a first channel 1123, a second channel 1124, and a third channel 1125. Generally, the box cover 112 is a plate, which refers to a plate-like structure having a certain thickness and extended area, and the ratio of extended area to thickness is relatively large.

[0209] The main cover 1121 refers to a part of the box cover 112, which refers to the part that can be covered on the opening of the main box body 111 and is provided with an exhaust hole 1121a and a third channel 1125. The exhaust hole 1121a penetrates the main cover 1121 along the thickness direction of the main cover 1121, connecting the space where the first pressure relief mechanism 122 is located and the first channel 1123 located outside the exhaust hole 1121a.

[0210] Sub-cover 1122 refers to another portion of cover 112, and is a portion that, together with main cover 1121, forms first channel 1123 and second channel 1124. A portion of sub-cover 1122 merges with a portion of main cover 1121 provided with vent 1121a to form first channel 1123, while another portion of sub-cover 1122 merges with another portion of main cover 1121, avoiding vent 1121a, to form second channel 1124.

[0211] The main cover 1121 and the auxiliary cover 1122 may be integrally formed or connected by welding or gluing.

[0212] Among them, one-piece molding refers to a process of constructing a predetermined shape by deforming or extending a material body, or leaving a predetermined shape by partially removing a material body, including but not limited to the extension of the same material or the sequential extension of different materials, including but not limited to the process of using a stamping machine to stamp a blank material to deform it and finally form it into a predetermined shape, or using a forging tool to forge the blank material to deform it and finally form it into a predetermined shape, or using a cutting device to partially remove the material of the blank material to leave a part with a predetermined shape, or using a liquid material to be cast into a casting cavity adapted to the shape of the component and then cooled to obtain a component.

[0213] The process of obtaining a component by pouring a liquid material into a casting cavity adapted to the shape of the component can be to obtain a complete component in one cavity, into which one or more materials can be cast. Alternatively, a portion of the component can be obtained in one cavity, moved to another cavity, and another portion of the component can be obtained in the other cavity, and so on. Different portions of the complete component can be molded in different cavities in sequence, and the materials of the different portions of the complete component can be the same or different.

[0214] The first channel 1123 , the second channel 1124 and the third channel 1125 are designed by utilizing the main box body 111 and the box cover 112 of the box body 11 , thereby simplifying the structural design of the box body 11 .

[0215] Another object of the embodiment of the present application is to provide an electrical device 100 , which includes the battery 10 as described above.

[0216] The electrical device 100 provided by the present technical solution adopts the battery 10 provided by the above-mentioned technical solution. The battery 10 provided by the above-mentioned technical solution has an exhaust hole 1121a on the box body 11 that penetrates the thickness of the box body 11. The first pressure relief mechanism 122 is connected to the exhaust hole 1121a when in an open state. The gas discharged from the first pressure relief mechanism 122 is discharged from the box body 11 through the exhaust hole 1121a. The outer space of the box body 11 is used to cool and reduce the pressure of the gas, thereby reducing or eliminating the risk of gas explosion inside the box body 11, which is beneficial to improving the safety performance of the electrical device 100.

[0217] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery, characterized in that: The battery comprises a box body and a battery cell; the box body is provided with an exhaust hole penetrating the box body along the thickness direction of the box body, and the battery cell is accommodated in the box body; The battery cell comprises a shell, and a first pressure relief mechanism and two electrodes arranged on the shell, wherein the first pressure relief mechanism communicates with the exhaust hole and the interior of the shell when the first pressure relief mechanism is opened, and at least one of the two electrodes and the first pressure relief mechanism are arranged on the same side of the shell; The battery further comprises a separator, the separator being connected between the box and the battery cell to separate the first pressure relief mechanism from the electrode, and to separate the exhaust hole from the electrode, the first pressure relief mechanism and the exhaust hole being arranged on the same side of the separator, and the electrode on the same side as the first pressure relief mechanism being arranged on the other side of the separator; The box body is provided with a channel structure, the channel structure and the first pressure relief mechanism are arranged on both sides of the axial direction of the exhaust hole, and the exhaust hole is connected with the channel structure; The channel structure includes a first channel, the first channel extends along the first direction, and the exhaust hole communicates with the first channel and the first pressure relief mechanism; The battery comprises a plurality of battery groups arranged along a second direction, the battery groups comprising a plurality of battery cells, the first direction and the second direction being perpendicular; the channel structure comprises a plurality of the first channels, the first channels and the battery groups being arranged one to one; The channel structure comprises a second channel, the second channel extends along the second direction, and a plurality of the first channels are all connected to the second channel; The channel structure includes a third channel, the extension direction of the third channel is consistent with the axial direction of the exhaust hole, and a second pressure relief mechanism is provided at one end of the third channel away from the second channel; and the second pressure relief mechanism and the first pressure relief mechanism are arranged on the same side of the exhaust hole.

2. The battery according to claim 1, characterized in that: The first pressure relief mechanism and the two electrodes are arranged on the same side of the shell, and the first pressure relief mechanism is arranged between the two electrodes; the isolation member is arranged between the first pressure relief mechanism and one of the electrodes, and the isolation member is arranged between the first pressure relief mechanism and the other electrode.

3. The battery according to claim 2, characterized in that: The first pressure relief mechanism is arranged at a central position between the two electrodes.

4. The battery according to claim 2, characterized in that: The first pressure relief mechanism is adjacent to one of the electrodes and distal to the other electrode.

5. The battery according to claim 1, characterized in that: The first pressure relief mechanism and the two electrodes are arranged on the same side of the shell, the first pressure relief mechanism and the two electrodes are arranged in sequence, and the isolation member is arranged between the first pressure relief mechanism and the electrodes adjacent thereto.

6. The battery according to claim 4 or 5, characterized in that: The battery comprises a plurality of battery cells, the plurality of battery cells are stacked along a first direction, any two adjacent battery cells are oppositely placed along a second direction, and the first direction is perpendicular to the second direction.

7. The battery according to claim 4 or 5, characterized in that: The battery comprises a plurality of battery cells, the plurality of battery cells are stacked along a first direction, any two adjacent battery cells are placed identically along a second direction, and the first direction is perpendicular to the second direction.

8. The battery according to any one of claims 2 to 5, characterized in that: The battery comprises a plurality of battery cells, and the plurality of battery cells are stacked along a first direction; The isolation member extends along the first direction, and the isolation member is connected to the plurality of battery cells.

9. The battery according to any one of claims 1 to 5, characterized in that: The spacing distance between the isolating member and the electrode adjacent thereto is greater than or equal to 35 mm; The dimension of the separator in the direction from the separator to the electrode adjacent thereto is greater than or equal to 4 mm. and is less than or equal to the spacing distance between the isolation member and the electrode adjacent thereto.

10. The battery according to claim 9, characterized in that: The dimension of the isolating member in the direction from the box body to the battery cell is greater than or equal to 0.3 mm.

11. The battery according to claim 1, characterized in that: The box body is provided with a second pressure relief mechanism, which is arranged at an end of the channel structure away from the exhaust hole. The second pressure relief mechanism is connected with the channel structure and the outside of the box body when in an open state.

12. The battery according to claim 1, characterized in that: The battery comprises a plurality of battery cells stacked along a first direction, the box body is provided with a plurality of exhaust holes arranged along the first direction, the plurality of exhaust holes are respectively connected with the channel structure, and the first pressure relief mechanism is arranged one-to-one with the exhaust holes.

13. The battery according to claim 1, characterized in that: The battery includes a plurality of battery cells stacked along a first direction, the exhaust hole extends along the first direction, and the plurality of first pressure relief mechanisms of the plurality of battery cells are arranged within the projection of the exhaust hole along the axial direction thereof, and the first direction is perpendicular to the axial direction.

14. The battery according to claim 1, characterized in that: The box body comprises a main box body and a box cover, and the box cover comprises a main cover member and a sub-cover member; The main cover is disposed on the main box body, the main cover and the main box body together define a space for accommodating the battery monomer, and the exhaust hole and the third channel are disposed on the main cover; The auxiliary cover is arranged on a side of the main cover away from the main box body, and the auxiliary cover and the main cover together define the first channel and the second channel.

15. An electrical device, characterized in that: The electrical device comprises a battery as claimed in any one of claims 1 to 14.

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