Battery and electric device

Abstract

The present application provides a battery and an electric device. The battery comprises a case, a battery cell, and a detection device; the case is provided with an accommodating cavity; the battery cell is arranged in the accommodating cavity and comprises a casing and a pressure relief mechanism, the casing has a first wall, and the pressure relief mechanism is arranged on the first wall of the casing; the detection device is arranged in the accommodating cavity, and the detection device is located between the first wall and the case and used for detecting whether the pressure relief mechanism is opened or not. According to the battery provided by the present application, the opening of the pressure relief mechanism can be detected more timely and accurately by means of the detection device, so that the battery can be controlled to take measures such as power shutdown and cooling in time, helping to reduce the further spread of thermal runaway in the battery, improving the reliability of the battery.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202322922083.7, filed on October 30, 2023, entitled “Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0004] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0005] In the development of battery technology, in addition to improving battery performance, battery reliability is also an issue that needs to be considered. Therefore, how to improve battery reliability is an issue of continuous improvement in battery technology.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a battery and an electrical device that can improve the reliability of battery cells.

[0008] In a first aspect, the present application provides a battery comprising a case, a battery cell and a detection device; the case has a receiving cavity; the battery cell is arranged in the receiving cavity, the battery cell comprises an outer shell and a pressure relief mechanism, the outer shell has a first wall, and the pressure relief mechanism is arranged on the first wall of the outer shell; the detection device is arranged in the receiving cavity, the detection device is located between the first wall and the case, and is used to detect whether the pressure relief mechanism is opened.

[0009] The battery provided in the embodiment of the present application disposes the detection device together with the battery in the accommodating cavity of the box body, and disposes the detection device between the first wall and the box body, so that the detection device can detect the opening of the pressure relief mechanism more promptly and accurately, which is conducive to controlling the battery to take measures such as power off and cooling in a timely manner, thereby helping to reduce the further spread of thermal runaway inside the battery and improving the reliability of the battery.

[0010] In some embodiments, the battery further comprises an isolator, which is disposed within the accommodating chamber and is disposed opposite the first wall. The isolator divides the accommodating chamber into a first accommodating chamber and a second accommodating chamber. The isolator has an opening that connects the first accommodating chamber and the second accommodating chamber. The battery cell is accommodated within the first accommodating chamber, and at least a portion of the pressure relief mechanism is opposite the opening. This helps reduce the spread of heat to adjacent battery cells after the pressure relief mechanism of any battery cell is activated, thereby improving the reliability of the battery. In some embodiments, the orthographic projection of the opening on the first wall covers the pressure relief mechanism, and the peripheral side of the opening is sealed to the first wall to isolate the first accommodating chamber from the second accommodating chamber. The detection device is accommodated in the second accommodating chamber. This helps reduce the risk of further spread of thermal runaway of the battery and improves the sensitivity of the detection device in detecting the activation of the pressure relief mechanism of the battery cell, so as to more promptly detect the activation of the pressure relief mechanism of the battery cell, which helps further improve the reliability of the battery.

[0011] In some embodiments, the battery further includes an adhesive layer disposed around the opening and adhesively connecting the first wall and the separator. This simple structure isolates the first and second accommodating cavities from each other, providing good sealing performance and cost-effectiveness.

[0012] In some embodiments, the detection device is connected to the isolation member. In this way, under the premise of detecting the opening of the pressure relief mechanism of the battery cell by the detection device, the structural stability of the detection device is improved and the risk of detection failure of the detection device is reduced.

[0013] In some embodiments, the box includes a frame and a guard plate, the guard plate is connected to the frame, the guard plate is arranged on a side of the frame facing the first wall, and the detection device is connected to the guard plate. This is conducive to further improving the reliability of the battery.

[0014] In some embodiments, at least one detection device is disposed opposite the pressure relief mechanism. This arrangement facilitates more timely and accurate detection of the pressure relief process of the corresponding battery cell, further improving the reliability of the detection device in detecting the opening of the pressure relief mechanism of the battery cell.

[0015] In some embodiments, the battery further comprises electrode terminals, and the housing further comprises a second wall, the second wall being distinct from the first wall, on which the electrode terminals are located. The battery further comprises a current collector, which electrically connects the electrode terminals of different battery cells. This helps reduce the risk of gas, liquid, etc., within the battery cells being ejected toward the current collector, thereby reducing the risk of liquid ejected from the battery cells electrically connecting to the current collector, and thus reducing the risk of internal battery short circuits, thereby improving the reliability of the battery.

[0016] In some embodiments, the first wall and the second wall are disposed opposite each other. Thus, the manifold and the pressure relief mechanism are located on opposite sides of the housing. When the pressure relief mechanism is activated, gas, liquid, etc. within the battery cells flow out in a direction away from the manifold, further reducing the risk of liquid, etc., leaking from the battery cells being electrically connected to the manifold and causing an internal short circuit in the battery, thereby further improving the reliability of the battery.

[0017] In some embodiments, the first wall and the second wall are intersecting. With this arrangement, when the pressure relief mechanism is activated, the outflow direction of gas, liquid, etc. inside the battery cell intersects with the extension direction of the manifold, further reducing the risk of liquid, etc. leaking from the battery cell being electrically connected to the manifold and causing an internal short circuit in the battery, thereby further improving the reliability of the battery.

[0018] In some embodiments, the battery includes multiple detection devices, which are spaced apart. This allows the nearest detection device to detect the activation of the pressure relief mechanism of any battery cell. This facilitates more sensitive and accurate detection of the activation of the pressure relief mechanism of any battery cell within the battery using multiple detection devices, further improving the reliability of the battery.

[0019] In some embodiments, the detection device includes at least one of a temperature detection element, an air pressure detection element, and a liquid detection element. This arrangement facilitates accurate and timely detection of the risk of thermal runaway of the battery.

[0020] In a second aspect, an embodiment of the present application provides an electrical device, comprising the battery provided in the above embodiment, and the battery is used to provide electrical energy.

[0021] The electrical device provided in the embodiment of the present application has the same technical effects as the battery provided in the above embodiment, and thus will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. 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 the drawings without creative work.

[0023] FIG1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0024] FIG2 is a schematic structural diagram of a battery provided in an embodiment of the present application;

[0025] FIG3 is a schematic structural diagram of a battery module in a battery provided in an embodiment of the present application;

[0026] FIG4 is a schematic diagram of an exploded structure of a battery cell in a battery provided in an embodiment of the present application;

[0027] FIG5 is a schematic diagram of an exploded structure of a battery provided in an embodiment of the present application;

[0028] FIG6 is a front view of a battery provided in an embodiment of the present application;

[0029] FIG7 is a schematic cross-sectional view of FIG6 along AA;

[0030] FIG8 is another schematic cross-sectional view of the structure along AA in FIG6;

[0031] FIG9 is a partial enlarged view of point B in FIG8 ;

[0032] FIG10 is another partial enlarged view of point B in FIG8 ;

[0033] FIG11 is another partial enlarged view of point B in FIG8 .

[0034] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0035] Marking instructions: 1. Vehicle; 1a. Motor; 1b. Controller; 10. Battery; 11. Box; 11a. Accommodation chamber; 111a. First accommodation chamber; 112a. Second accommodation chamber; 111. First box portion; 112. Second box portion; 113. Frame; 114. Guard plate; 12. Insulator; 12a. Opening; 20. Battery module; 30. Battery cell; 31. Outer shell; 31a. Accommodation chamber; 31b. First wall; 31c. Second wall; 311. Shell; 312. End cover; 32. Electrode assembly; 33. Electrode terminal; 34. Pressure relief mechanism; 40. Detection device; 50. Busbar. DETAILED DESCRIPTION

[0036] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0038] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0039] It should also be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0040] The term "plurality" used in this application refers to two or more (including two).

[0041] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0042] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid through a busbar.

[0043] In some embodiments, the battery may be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0044] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0045] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0046] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0047] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0048] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0049] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0050] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with a silver surface treatment may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0051] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, this application is not limited to these materials; other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used singly or in combination of two or more.

[0052] In some embodiments, the positive electrode may be a carbon foam or a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or an alloy foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0053] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0054] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0055] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0056] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0057] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0058] In some embodiments, the negative electrode may be made of carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0059] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal, or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0060] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0061] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode. The present application does not particularly limit the type of separator, and any known porous separator with good chemical and mechanical stability can be selected.

[0062] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0063] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0064] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0065] In some embodiments, the electrode assembly is a laminate structure.

[0066] Multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and multiple positive electrode sheets and multiple negative electrode sheets can be alternately stacked.

[0067] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0068] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0069] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0070] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0071] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0072] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0073] The battery cell also includes a housing, which has a housing formed inside for accommodating the electrode assembly. The housing can protect the electrode assembly from the outside to prevent external foreign matter from affecting the charging or discharging of the electrode assembly.

[0074] In related technologies, during battery operation, if a battery cell experiences abnormal temperature, for example, the pressure relief mechanism of the battery cell opens. In this case, timely detection of the pressure relief of the battery cell is necessary to control the battery to stop operation and take appropriate cooling measures to reduce the risk of further thermal runaway. However, in related technologies, when some battery cells experience thermal runaway, the relevant control system in the battery cannot detect it in time and take appropriate measures in a timely manner, causing the thermal runaway to spread further. This seriously affects the reliability of the battery.

[0075] In view of this, an embodiment of the present application provides a technical solution, which arranges the detection device together with the battery cell in the accommodating cavity of the box body, and arranges the detection device between the first wall and the box body, so that the thermal runaway risk of the battery cell can be detected more sensitively and quickly through the detection device, which is conducive to improving the reliability performance of the battery.

[0076] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0077] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0078] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0079] As shown in FIG1 , a battery 10 is provided inside a vehicle 1. The battery 10 may be provided at the bottom, head, or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may serve as an operating power source for the vehicle 1.

[0080] The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of the vehicle 1 during starting, navigation, and driving.

[0081] In some embodiments of the present application, the battery 10 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0082] 2 , the battery 10 includes battery cells (not shown in FIG2 ) and may further include a case for accommodating the battery cells.

[0083] The housing 11 is used to accommodate battery cells, and the housing 11 can have various structural forms. In some embodiments, the housing 11 can include a first housing portion 111 and a second housing portion 112. The first housing portion 111 and the second housing portion 112 cover each other. The first housing portion 111 and the second housing portion 112 together define a storage space for accommodating battery cells. The second housing portion 112 can be a hollow structure with one end open. The first housing portion 111 is a plate-like structure, and the first housing portion 111 covers the open side of the second housing portion 112 to form the housing 11 with a storage space. The first housing portion 111 and the second housing portion 112 can also both be hollow structures with one side open. The open side of the first housing portion 111 covers the open side of the second housing portion 112 to form the housing 11 with a storage space. Of course, the first housing portion 111 and the second housing portion 112 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0084] In order to improve the sealing performance after the first box body 111 and the second box body 112 are connected, a sealing member, such as a sealant, a sealing ring, etc., may be further provided between the first box body 111 and the second box body 112 .

[0085] Assuming that the first box portion 111 covers the second box portion 112 , the first box portion 111 can also be referred to as an upper box cover, and the second box portion 112 can also be referred to as a lower box 11 .

[0086] In the battery 10, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 can be housed within the housing 11. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 20. Multiple battery modules 20 can then be connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed within the housing 11.

[0087] As shown in FIG3 , in some embodiments, a battery module 20 includes multiple battery cells 30. The multiple battery cells 30 are first connected in series, parallel, or in series to form the battery module 20. The multiple battery modules 20 are then connected in series, parallel, or in series to form a single unit, which is then housed within the housing 11.

[0088] In some embodiments, the multiple battery cells 30 in the battery module 20 may be electrically connected via a busbar 50 to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .

[0089] The battery 10 may also not have a box, but include multiple battery cells connected in series or in parallel. After the multiple battery cells are connected in series or in parallel, they are fixed by structures such as steel belts or binding straps. Then, multiple batteries 10 are connected in series or in parallel to form a new energy storage unit.

[0090] In some embodiments, the multiple battery cells in the battery 10 may be electrically connected via the busbar 50 to achieve parallel connection, series connection, or hybrid connection of the multiple battery cells in the battery 10 .

[0091] 4 , a battery cell 30 provided in an embodiment of the present application includes an electrode assembly 32 and a housing 31 . The housing 31 has a receiving cavity 31 a , and the electrode assembly 32 is received in the receiving cavity 31 a .

[0092] The outer shell 31 may include a shell 311 and an end cover 312. When assembling the battery cell 30, the electrode assembly 32 may be placed into the accommodating cavity 31a first, and then the end cover 312 may be covered on the shell 311. Then, the electrolyte may be injected into the accommodating cavity 31a through the electrolyte injection port on the end cover 312.

[0093] In some embodiments, the housing 31 may also be used to contain electrolytes, such as electrolytes. The housing 31 may be in various structural forms.

[0094] The housing 31 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc. The shape of the housing 31 can be determined based on the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 has a cylindrical structure, the housing 31 can also be a cylindrical structure. If the electrode assembly 32 has a rectangular parallelepiped structure, the housing 31 can also be a rectangular parallelepiped structure. In FIG4 , for example, both the housing and the electrode assembly 32 have rectangular parallelepiped structures.

[0095] The shell 31 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0096] There may be one or more electrode assemblies 32 housed in the housing 31. In FIG4 , there are two electrode assemblies 32 housed in the housing 31.

[0097] As shown in Figures 4 to 7, the battery 10 provided according to an embodiment of the present application includes a housing 11, a battery cell 30, and a detection device 40. The housing 11 has a receiving cavity 11a, in which the battery cell 30 is disposed. The battery cell 30 includes a housing 31 and a pressure relief mechanism 34. The housing 31 has a first wall 31b, and the pressure relief mechanism 34 is disposed on the first wall 31b of the housing 31. The detection device 40 is disposed within the receiving cavity 11a, between the first wall 31b and the housing 11, and is used to detect whether the pressure relief mechanism 34 is activated.

[0098] The housing 31 may include a shell 311 and an end cap 312. The shell 311 and the end cap 312 cover each other to form a housing chamber 31a for accommodating the electrode assembly. The first wall 31b may be a side wall of the shell 311, or the first wall 31b may be a side wall of the end cap 312. In other words, the pressure relief mechanism 34 may be provided on any side wall of the shell 311, or the pressure relief mechanism 34 may be provided on the end cap 312.

[0099] The pressure relief mechanism 34 can be an explosion-proof valve, which opens and relieves pressure when the air pressure inside the shell 31 reaches a preset air pressure threshold, so that the gas inside the battery cell 30 flows out through the pressure relief mechanism 34, thereby reducing the pressure inside the battery cell 30. This helps to reduce the risk of explosion of the battery cell 30 due to excessive internal pressure.

[0100] It can be understood that when the pressure relief mechanism 34 is opened, the internal gas will flow out and flow out through the accommodation space between the first wall 31b and the box body 11. By arranging the detection device 40 between the first wall 31b and the box body 11, during the pressure relief process of the battery cell 30, the detection device 40 can detect the pressure relief process of the battery cell 30 in a timely and accurate manner, so as to timely control the power off of the battery 10 and reduce the risk of thermal runaway of the battery 10.

[0101] Optionally, when the pressure relief mechanism 34 is open, gas from within the battery cell 30 may flow out, along with the electrolyte within the battery cell 30. Furthermore, when the pressure relief mechanism 34 is open, the temperature within the battery cell 30 may rise. Therefore, the detection device 40 may detect the opening of the pressure relief mechanism 34 by detecting any one or more of the airflow, temperature, and liquid in the surrounding environment, so that the relevant control system can promptly determine whether the pressure relief mechanism 34 of the battery cell 30 is open. Therefore, the detection device 40 may include any one of an air pressure detection element, a temperature detection element, and a liquid detection element.

[0102] The detection device 40 can be electrically connected to the battery 10 management system of the battery 10, so that when the detection device 40 detects that the pressure relief mechanism 34 is open, the battery 10 management system can promptly transmit relevant signals to the battery 10 management system, so that the battery 10 management system can promptly control the power off of the battery 10 and cool down the battery cell 30 according to the signal of the pressure relief mechanism 34 of the battery cell 30 sent by the detection device 40, thereby reducing the risk of continued spread of thermal runaway inside the battery 10.

[0103] If the detection device 40 is located between the first wall 31b and the box body 11, the detection device 40 can be connected to the box body 11, or an isolation structure can be provided between the first wall 31b and the box body 11, and the detection device 40 can be provided between the isolation structure and the first wall 31b, or the detection device 40 can be provided between the isolation structure and the box body 11. In this case, the detection device 40 can be connected to the box body 11, or the detection device 40 can be connected to the isolation structure.

[0104] The battery 10 provided in the embodiment of the present application is provided with a detection device 40 and the battery 10 together in the accommodating cavity 11a of the box body 11, and the detection device 40 is provided between the first wall 31b and the box body 11, so that the detection device 40 can detect the opening of the pressure relief mechanism 34 more promptly and accurately, which is conducive to controlling the battery 10 to take measures such as power off and cooling in a timely manner, thereby helping to reduce the further spread of thermal runaway inside the battery 10 and improving the reliability of the battery 10.

[0105] As shown in Figure 8, in some embodiments, the battery 10 also includes an isolation member 12, which is arranged in the accommodating chamber 11a and is arranged opposite to the first wall 31b. The isolation member 12 divides the accommodating chamber 11a into a first accommodating chamber 111a and a second accommodating chamber 112a. The isolation member 12 has an opening 12a, which connects the first accommodating chamber 111a and the second accommodating chamber 112a. The battery cell 30 is accommodated in the first accommodating chamber 111a, and at least a portion of the pressure relief mechanism 34 is opposite to the opening 12a.

[0106] The isolation member 12 divides the accommodating chamber 11a into a first accommodating chamber 111a and a second accommodating chamber 112a. The battery cell 30 is accommodated in the first accommodating chamber 111a. The pressure relief mechanism 34 can be arranged in the first accommodating chamber 111a, or the pressure relief mechanism 34 can be arranged in the second accommodating chamber 112a.

[0107] Optionally, the first accommodating chamber 111a and the second accommodating chamber 112a may be arranged side by side along the gravity direction, or the second accommodating chamber 112a and the first accommodating chamber 111a may be arranged side by side along the horizontal direction.

[0108] At least a portion of the pressure relief mechanism 34 is opposite to the opening 12 a . Alternatively, the pressure relief mechanism 34 may be completely opposite to the opening 12 a , or a portion of the pressure relief mechanism 34 may be opposite to the opening 12 a .

[0109] Since at least a portion of the pressure relief mechanism 34 is opposite to the opening 12a of the isolation member 12, when the pressure relief mechanism 34 is opened, at least a portion of the gas, liquid, etc. inside the battery cell 30 will pass through the opening 12a and enter the second accommodating chamber 112a. In this way, the gas, liquid, etc. in the pressure relief process of the battery cell 30 are collected in the second accommodating chamber 112a which is isolated from the first accommodating chamber 111a where the battery cell 30 is located, or can flow out of the battery 10 through the second accommodating chamber 112a, which is beneficial to reduce the spread of heat to the adjacent battery cell 30 after the pressure relief mechanism 34 of any battery cell 30 is opened, and further beneficial to improving the reliability performance of the battery 10.

[0110] As shown in Figures 8 and 9, in some embodiments, the opening 12a covers the pressure relief mechanism 34 on the positive projection of the first wall 31b, and the peripheral side of the opening 12a is sealed to the first wall 31b so that the first accommodating chamber 111a and the second accommodating chamber 112a are isolated from each other, and the detection device 40 is accommodated in the second accommodating chamber 112a.

[0111] The periphery of the opening 12a is sealed with the first wall 31b, so that the battery cell 30 can block the opening 12a of the separator 12, thereby isolating the first accommodating cavity 111a and the second accommodating cavity 112a from each other. It should be noted that when the first accommodating cavity 111a and the second accommodating cavity 112a are isolated from each other, the first accommodating cavity 111a and the second accommodating cavity 112a are sealed from each other, and gas and the like cannot flow between them.

[0112] The orthographic projection of the opening 12a on the first wall 31b covers the pressure relief mechanism 34. When the pressure relief mechanism 34 is open, all gas, liquid, and other substances flowing out of the battery cell 30 through the pressure relief mechanism 34 will flow into the second accommodating chamber 112a and be contained therein. This reduces the risk of thermal runaway within the battery 10 spreading due to the liquid or high-temperature, high-pressure gas within any battery cell 30 coming into contact with other battery cells 30 after thermal runaway.

[0113] When the pressure relief mechanism 34 of any battery cell 30 is opened, the gas, liquid, etc. in the battery cell 30 will flow to the second accommodating chamber 112a through the opening 12a. By arranging the detection device 40 in the second accommodating chamber 112a, it is beneficial to improve the sensitivity of the detection device 40 in detecting the opening of the pressure relief mechanism 34 of the battery cell 30, so as to detect the opening of the pressure relief mechanism 34 of the battery cell 30 more timely, which is beneficial to further improve the reliability performance of the battery 10.

[0114] In some embodiments, the battery 10 further includes an adhesive layer, which is disposed around the opening 12 a and adhesively connects the first wall 31 b and the isolation member 12 .

[0115] In this way, the battery cell 30 can be bonded to the separator 12, and an adhesive layer can be provided around the opening 12a to achieve a sealed connection between the first wall 31b of the battery cell 30 and the periphery of the opening 12a of the separator 12, thereby isolating the first accommodating cavity 111a from the second accommodating cavity 112a. This simple structure provides good sealing performance and economic efficiency.

[0116] As shown in FIG. 8 and FIG. 10 , in some embodiments, the detection device 40 is connected to the isolation member 12 .

[0117] The detection device 40 is connected to the isolation member 12, and the isolation member 12 bears the weight of the detection device 40. This is beneficial to improving the structural stability of the detection device 40 and reducing the risk of detection failure of the detection device 40 under the premise that the detection device 40 detects the opening of the pressure relief mechanism 34 of the battery cell 30.

[0118] As shown in Figures 8, 9 and 11, in some embodiments, the box body 11 includes a frame 113 and a guard plate 114, the guard plate 114 is connected to the frame 113, the guard plate 114 is arranged on the side of the frame 113 facing the first wall 31b, and the detection device 40 is connected to the guard plate 114.

[0119] The second accommodating chamber 112a can be located below the first accommodating chamber 111a along the direction of gravity. Connecting the detection device 40 to the protective plate 114 is beneficial to improving the structural stability of the detection device 40, and further improving the reliability of the detection device 40 in detecting the opening of the pressure relief mechanism 34 of the battery cell 30. This is beneficial to further improve the reliability performance of the battery 10.

[0120] As shown in FIG. 8 , FIG. 10 and FIG. 11 , in some embodiments, at least one detection device 40 is disposed opposite to the pressure relief mechanism 34 .

[0121] Optionally, one detection device 40 may be provided in one battery 10 , or multiple detection devices 40 may be provided in one battery 10 , which may be selected according to actual needs.

[0122] At least one detection device 40 is disposed opposite to the pressure relief mechanism 34 , and thus at least one detection device 40 can be disposed opposite to the pressure relief mechanism 34 of any battery cell 30 .

[0123] When the pressure relief mechanism 34 of any battery cell 30 is activated, the high-temperature, high-pressure gas inside flows out through the pressure relief mechanism 34. As the gas flows, its flow rate and temperature decrease. Therefore, the closer the detection device 40 is to the pressure relief mechanism 34, the easier it is to detect pressure relief from the pressure relief mechanism 34 of a battery cell 30.

[0124] Therefore, by arranging at least one detection device 40 opposite to the pressure relief mechanism 34 , the pressure relief process of the corresponding battery cell 30 can be detected more timely and accurately, which is conducive to further improving the reliability of the detection device 40 in detecting the opening of the pressure relief mechanism 34 of the battery cell 30 .

[0125] As shown in Figures 3, 6, 7, and 8, in some embodiments, the battery 10 further includes electrode terminals 33, and the housing 31 further includes a second wall 31c, which is distinct from the first wall 31b and on which the electrode terminals 33 are located. The battery 10 further includes a busbar 50, which electrically connects the electrode terminals 33 of different battery cells 30.

[0126] If the second wall 31c is different from the first wall 31b, then optionally, the second wall 31c may intersect with the first wall 31b, or the second wall 31c may be arranged opposite to the first wall 31b.

[0127] The electrode terminals 33 are provided on the second wall 31 c , and the busbar 50 electrically connects the electrode terminals 33 of different battery cells 30 to achieve mutual series or parallel connection of the different battery cells 30 .

[0128] If the second wall 31c is set to be different from the first wall 31b, the manifold 50 is located on different sides of the battery cell 30 and the pressure relief mechanism 34. In this way, when the battery cell 30 suffers from thermal runaway, the gas, liquid, etc. inside the battery cell 30 will flow out through the pressure relief mechanism 34, which is beneficial to reduce the risk of the gas, liquid, etc. inside the battery cell 30 being sprayed toward the manifold 50, and further helps to reduce the risk of the liquid sprayed from the battery cell 30 being electrically connected to the manifold 50, which is beneficial to reduce the risk of internal short circuit of the battery 10, and further improve the reliability performance of the battery 10.

[0129] As shown in FIG. 6 and FIG. 8 , in some embodiments, the first wall 31 b and the second wall 31 c are disposed opposite to each other.

[0130] In this way, the busbar 50 and the pressure relief mechanism 34 are located on opposite sides of the shell 31. When the pressure relief mechanism 34 is opened, the gas, liquid, etc. inside the battery cell 30 flows out in the direction away from the busbar 50, further reducing the risk of liquid leaked from the battery cell 30 being electrically connected to the busbar 50 and causing an internal short circuit in the battery 10, which is beneficial to further improve the reliability of the battery 10.

[0131] As shown in FIG. 6 and FIG. 7 , in some embodiments, the first wall 31 b and the second wall 31 c are arranged to intersect.

[0132] When the first wall 31b and the second wall 31c intersect, when the pressure relief mechanism 34 is opened, the outflow direction of the gas, liquid, etc. inside the battery cell 30 intersects with the extension direction of the manifold 50, further reducing the risk of the liquid, etc. leaked from the battery cell 30 being electrically connected to the manifold 50 and causing an internal short circuit in the battery 10, which is beneficial to further improve the reliability of the battery 10.

[0133] As shown in FIG. 8 and FIG. 11 , in some embodiments, the battery 10 includes a plurality of detection devices 40 , and the plurality of detection devices 40 are arranged at intervals.

[0134] The battery 10 includes multiple detection devices 40. Optionally, the battery 10 may include two, three or even more detection devices 40. For example, the number of detection devices 40 in the battery 10 is equal to the number of battery cells 30, so that the detection devices 40 are arranged in a one-to-one correspondence with the battery cells 30. When the pressure relief mechanism 34 of any battery cell 30 is opened, it can be detected by the corresponding pressure relief mechanism 34.

[0135] Therefore, the battery 10 includes multiple detection devices 40, and the multiple detection devices 40 are spaced apart. If the pressure relief mechanism 34 of any battery cell 30 is activated, it can be detected by the nearest detection device 40. This facilitates more sensitive and accurate detection of the activation of the pressure relief mechanism 34 of any battery cell 30 within the battery 10 through the multiple detection devices 40, further improving the reliability of the battery 10.

[0136] In some embodiments, the detection device 40 includes at least one of a temperature detection element, an air pressure detection element, and a liquid detection element.

[0137] Optionally, the temperature detection element may be a temperature sensor, the air pressure detection element may be an air pressure sensor, and the liquid detection element may be a liquid sensor.

[0138] The detection device 40 may include only one of a temperature detection element, an air pressure detection element, and a liquid detection element, or the detection element may include multiple of the temperature detection element, the air pressure detection element, and the liquid detection element. The temperature detection element, the air pressure detection element, and the liquid detection element may be provided separately, or any two or three of the temperature detection element, the air pressure detection element, and the liquid detection element may be integrated into one.

[0139] The detection device 40 includes a temperature detection element, an air pressure detection element, and a liquid detection element. When the pressure relief mechanism 34 of the battery cell 30 is opened, the gas and liquid inside the battery cell 30 flow out and flow through the detection device 40, which will cause the pressure, temperature, etc. of the detection device 40 to change. The detection device 40 detects the pressure change or temperature change, etc., and can determine whether the pressure relief mechanism 34 of any battery cell 30 inside the battery 10 is opened, so as to accurately and timely detect the thermal runaway risk of the battery 10.

[0140] The electrical device provided according to an embodiment of the present application includes the battery 10 provided in any of the above embodiments, and the battery 10 is used to provide electrical energy.

[0141] The battery 10 provided in the embodiment of the present application has the same technical effects as the battery 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0142] As shown in Figures 4 to 11, in some embodiments, the battery 10 provided in the embodiments of the present application includes a housing 11, a battery cell 30, a current collector 50, a detection device 40, and an isolator 12. The housing 11 has a housing 11a, and the battery cell 30, the detection device 40, and the isolator 12 are disposed in the housing 11a. The isolator 12 divides the housing 11a into a first housing 111a and a second housing 112a. The battery cell 30 is accommodated in the first housing 111a, and the detection device 40 is accommodated in the second housing 112a. The battery cell 30 includes a housing 31, an electrode terminal 33, and a pressure relief mechanism 34. The housing 31 has a first wall 31b and a second wall 31c, which are disposed opposite each other. The pressure relief mechanism 34 is disposed on the first wall 31b, and the electrode terminal 33 is disposed on the second wall 31c. The separator 12 has an opening 12a that connects the first and second accommodating chambers 111a and 112a. At least a portion of the pressure relief mechanism 34 is disposed opposite the opening 12a. The busbar 50 electrically connects the electrode terminals 33 of different battery cells 30. The detection device 40 is disposed opposite the pressure relief mechanism 34.

[0143] The battery 10 provided in the embodiment of the present application is provided with a detection device 40 and the battery 10 together in the accommodating cavity 11a of the box body 11, and the detection device 40 is provided between the first wall 31b and the box body 11, so that the detection device 40 can detect the opening of the pressure relief mechanism 34 more promptly and accurately, which is conducive to controlling the battery 10 to take measures such as power off and cooling in a timely manner, thereby helping to reduce the further spread of thermal runaway inside the battery 10 and improving the reliability of the battery 10.

[0144] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A battery comprising: A box body having a containing cavity; A battery cell is disposed in the accommodating cavity, the battery cell comprises a shell and a pressure relief mechanism, the shell has a first wall, and the pressure relief mechanism is disposed on the first wall of the shell; A detection device is disposed in the accommodating cavity, the detection device is located between the first wall and the box body, and is used to detect whether the pressure relief mechanism is opened.

2. The battery according to claim 1, wherein The battery also includes an isolating member, which is disposed in the accommodating chamber and opposite to the first wall. The isolating member divides the accommodating chamber into a first accommodating chamber and a second accommodating chamber. The isolating member has an opening, which connects the first accommodating chamber and the second accommodating chamber. The battery cell is accommodated in the first accommodating chamber, and at least a portion of the pressure relief mechanism is opposite to the opening.

3. The battery according to claim 2, wherein The orthographic projection of the opening on the first wall covers the pressure relief mechanism, and the peripheral side of the opening is sealed to the first wall so that the first accommodating chamber and the second accommodating chamber are isolated from each other, and the detection device is accommodated in the second accommodating chamber.

4. The battery according to claim 3, wherein The battery further includes an adhesive layer, which is disposed around the opening and adhesively connects the first wall and the isolation member.

5. The battery according to any one of claims 2 to 4, wherein: The detection device is connected to the isolation element.

6. The battery according to any one of claims 1 to 5, wherein: The box body comprises a frame and a guard plate, wherein the guard plate is connected to the frame, the guard plate is arranged on a side of the frame facing the first wall, and the detection device is connected to the guard plate.

7. The battery according to any one of claims 1 to 6, wherein: At least one of the detection devices is arranged opposite to the pressure relief mechanism.

8. The battery according to any one of claims 1 to 7, wherein: The battery further includes an electrode terminal, the housing further includes a second wall, the second wall is different from the first wall, and the electrode terminal is disposed on the second wall; The battery further includes a busbar that electrically connects the electrode terminals of different battery cells.

9. The battery according to claim 8, wherein The first wall and the second wall are arranged opposite to each other.

10. The battery according to claim 8, wherein The first wall and the second wall are arranged to intersect each other.

11. The battery according to any one of claims 1 to 10, wherein: The battery comprises a plurality of the detection devices, and the plurality of the detection devices are arranged at intervals.

12. The battery according to any one of claims 1 to 11, wherein: The detection device includes at least one of a temperature detection element, an air pressure detection element, and a liquid detection element.

13. An electrical device, comprising the battery according to any one of claims 1 to 12, wherein the battery is used to provide electrical energy.

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