Battery and electric device

Abstract

Embodiments of the present application provide a battery and an electric device. The battery comprises a case, battery cells, and a plurality of air pressure sensors; the battery cells are arranged inside the case; the plurality of air pressure sensors are arranged inside the case at intervals, at least two air pressure sensors are located outside different side surfaces of the battery cells, and the plurality of air pressure sensors are used for respectively measuring air pressures at different positions inside the case. In this way, the present application can improve the accuracy of giving a thermal runaway alarm by using the air pressure sensors.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023110757996, filed on August 25, 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 batteries and electrical devices. Background Art

[0004] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0005] Thermal runaway management is crucial for battery operation. Typically, barometric pressure sensors are used to monitor pressure, providing early warning or alarms for thermal runaway events. However, current barometric pressure sensor-based pressure monitoring of internal battery pressure is limited to a single location, resulting in insufficient accuracy.

[0006] In addition, the above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art.

[0007] Summary of the Invention

[0008] In view of the above problems, the present application provides a battery and an electrical device that can improve the accuracy of thermal runaway alarm using an air pressure sensor.

[0009] In a first aspect, an embodiment of the present application provides a battery, which includes a shell, a battery cell and multiple air pressure sensors; the battery cell is arranged inside the shell; multiple air pressure sensors are arranged at intervals inside the shell, at least two air pressure sensors are located outside different sides of the battery cell, and the multiple air pressure sensors are respectively used to detect the air pressure at different positions inside the shell.

[0010] Using the above method, air pressure sensors can be used to monitor the air pressure outside the battery cell and provide thermal runaway alarms. Furthermore, the air pressure outside the battery cell is more stable than the air pressure inside the battery cell, so monitoring the air pressure outside the battery cell for thermal runaway alarms is relatively accurate. Furthermore, gas leaks can occur at different locations on the battery cell. Having multiple air pressure sensors allows for more comprehensive monitoring of the air pressure at different locations outside the battery cell, enabling more accurate thermal runaway alarms.

[0011] In some embodiments, multiple air pressure sensors form a three-dimensional air pressure detection array inside the housing, and the multiple air pressure sensors are not located on the same plane at the same time.

[0012] Through the above method, the air pressure detection dot matrix can more comprehensively monitor the air pressure at various locations outside the battery cell (inside the shell), and can thus detect the change in air pressure in a timely and accurate manner when the air pressure at any of the above locations is abnormal, thereby facilitating thermal runaway alarm.

[0013] In some embodiments, the battery cell includes a wall portion and an explosion-proof valve, which is arranged on the wall portion; the shell includes a first shell wall, a lateral shell wall and a second shell wall, and the lateral shell wall is connected between the first shell wall and the second shell wall; the first shell wall and the wall portion are arranged opposite to each other; the multiple air pressure sensors include at least one first air pressure sensor; and the at least one first air pressure sensor is arranged on the first shell wall or the wall portion.

[0014] In the above manner, at least one first air pressure sensor can be arranged between the first shell wall and the wall portion, so that when the explosion-proof valve cracks to release gas, it can sensitively identify the air pressure changes in the area between the first shell wall of the shell and the wall portion of the battery cell, thereby facilitating thermal runaway alarm.

[0015] In some embodiments, at least one first air pressure sensor is disposed on the first shell wall, and an orthographic projection of each first air pressure sensor on the plane where the wall is located falls into the explosion-proof valve.

[0016] In the above manner, the at least one first air pressure sensor can be directly opposite to the explosion-proof valve. When the explosion-proof valve is broken to release gas, the at least one first air pressure sensor can detect the air pressure change more sensitively.

[0017] In some embodiments, there are multiple battery cells, which are arranged in an array; there are multiple first air pressure sensors, which are arranged at intervals; and the orthographic projection of each first air pressure sensor on the plane where the wall is located falls into an explosion-proof valve.

[0018] Through the above method, multiple first air pressure sensors can be respectively set opposite the explosion-proof valves of multiple battery cells. Therefore, when any explosion-proof valve in the multiple battery cells ruptures and releases gas, the corresponding first air pressure sensor can sensitively monitor the air pressure change and then issue a thermal runaway alarm.

[0019] In some embodiments, there are multiple battery cells, which are arranged in an array; the orthographic projection of each first air pressure sensor on the plane where the wall portion is located falls between the explosion-proof valves of two adjacent battery cells.

[0020] In the above manner, each first air pressure sensor is arranged between the explosion-proof valves of two adjacent battery cells, which can effectively monitor the air pressure changes near the explosion-proof valves of the two battery cells, thereby reducing the number of first sensors to a certain extent and reducing the battery production cost.

[0021] In some embodiments, at least one first air pressure sensor is disposed in an area where the first shell wall and the wall portion are disposed opposite to each other.

[0022] In the above manner, the first air pressure sensor can relatively sensitively and accurately monitor the air pressure changes in the area between the first shell wall and the wall of the battery cell, thereby being able to sensitively perform a thermal runaway alarm.

[0023] In some embodiments, the plurality of air pressure sensors includes at least one second air pressure sensor, and the at least one second air pressure sensor is disposed at a connection between the first shell wall and the lateral shell wall.

[0024] In the above manner, the second air pressure sensor can further monitor the air pressure changes at the connection between the first shell wall and the lateral shell wall, thereby improving the accuracy of the thermal runaway alarm to a certain extent.

[0025] In some embodiments, the connection between the first shell wall and the lateral shell wall has a plurality of corner positions, and each second air pressure sensor is disposed at a corner position.

[0026] In the above manner, multiple second air pressure sensors can be respectively arranged at multiple corner positions between the first shell wall and the lateral shell wall, thereby being able to comprehensively monitor the air pressure at multiple corner positions and improve the accuracy of thermal runaway alarm.

[0027] In some embodiments, the plurality of air pressure sensors includes at least one third air pressure sensor, and the at least one third sensor is disposed on the lateral housing wall.

[0028] In the above manner, the third air pressure sensor can further monitor the air pressure changes between the lateral shell wall and the battery cell, thereby improving the accuracy of the thermal runaway alarm to a certain extent.

[0029] In some embodiments, the number of the third air pressure sensors is less than the number of the first air pressure sensors.

[0030] In the above manner, more first air pressure sensors are arranged in the area where air pressure changes are more likely to occur first during thermal runaway (that is, between the wall and the first shell wall), and fewer third air pressure sensors are arranged in the area where the probability of air pressure changes occurring first during thermal runaway is lower. This means that the air pressure changes between the shell and the battery cell can be sensitively and accurately monitored, and the number of air pressure sensors can be reduced to a certain extent, thereby reducing the production cost of the battery.

[0031] In some embodiments, the number of third air pressure sensors is multiple and divided into multiple groups, and each group of third air pressure sensors is arranged at circumferential intervals around the battery cell on the lateral shell wall; multiple groups of third air pressure sensors are arranged at intervals along the direction from the first shell wall to the second shell wall; in two adjacent groups of third air pressure sensors, the number of third air pressure sensors in the group close to the first shell wall is greater than the number of third air pressure sensors in the group close to the second shell wall.

[0032] Through the above method, the setting density of the third air pressure sensors gradually decreases in the direction from the first shell wall to the second shell wall. The number of third air pressure sensors on the side close to the first shell wall is large, which can relatively sensitively and comprehensively monitor the air pressure changes in the area. The number of third air pressure sensors on the side close to the second shell wall is small, which can reduce the battery production cost to a certain extent without significantly reducing the accuracy of the thermal runaway alarm.

[0033] In some embodiments, a ratio of the number of first air pressure sensors to the area of ​​the first housing wall is greater than a ratio of the number of third air pressure sensors to the area of ​​the lateral housing wall.

[0034] Through this approach, the density of the first pressure sensors installed on the first shell wall is greater than the density of the second pressure sensors installed on the lateral shell walls. This allows for more sensitive detection of pressure changes in the area near the first shell wall, and more accurate detection of pressure changes in the area near the lateral shell walls. Furthermore, the use of third pressure sensors can be reduced to a certain extent, thereby reducing battery production costs.

[0035] In some embodiments, the lateral shell wall includes two first side walls and two second side walls, the two first side walls are arranged opposite to each other, and the two second side walls are arranged opposite to each other and are respectively connected to the two first side walls; the area of ​​the first side wall is larger than the area of ​​the second side wall; at least part of the third air pressure sensors are arranged in an array on at least one of the two first side walls; and / or, at least another part of the third air pressure sensors are arranged in an array on at least one of the two second side walls.

[0036] Through the above method, part of the third air pressure sensors can be used to monitor the air pressure in the area between the first side wall and the battery cell, and another part of the third air pressure sensors can be used to monitor the air pressure in the area between the second side wall and the battery cell, thereby further monitoring the air pressure changes in the area between the lateral shell wall and the battery cell, thereby improving the accuracy of the thermal runaway alarm.

[0037] In some embodiments, the plurality of air pressure sensors include at least one fourth air pressure sensor, and the at least one fourth air pressure sensor is disposed on the second shell wall; the number of the fourth air pressure sensors is less than the number of the third air pressure sensors.

[0038] In this way, the fourth air pressure sensor can further monitor the air pressure changes in the area between the second shell wall and the battery cell, thereby improving the accuracy of the thermal runaway alarm. In addition, the number of fourth sensors is relatively small, which can reduce the production cost of the battery to a certain extent.

[0039] In some embodiments, the battery cell includes a positive electrode column and a negative electrode column, the battery includes a circuit board, the circuit board is arranged in the shell, the circuit board is electrically connected to the positive electrode column and the negative electrode column, and the circuit board is provided with a voltage conversion module; the battery is electrically connected to multiple air pressure sensors through the voltage conversion module to power the multiple air pressure sensors.

[0040] In the above manner, the battery cells are used to supply power to the air pressure sensor, thereby improving the integration of the battery.

[0041] In some embodiments, the battery includes a power supply independent of the battery cells. The power supply is disposed in the housing. The power supply is electrically connected to the multiple air pressure sensors to supply power to the multiple air pressure sensors.

[0042] In the above manner, the power supply can stably supply power to the air pressure sensor independently of other battery cells.

[0043] In some embodiments, the battery cell includes a processor, which is disposed in a shell and electrically connected to multiple air pressure sensors; the processor is used to obtain a measurement signal from each air pressure sensor and obtain the air pressure measured by each air pressure sensor based on the measurement signal; the processor is used to determine whether the battery has an air pressure abnormality based on the air pressure measured by the multiple air pressure sensors, and if so, a thermal runaway alarm is issued.

[0044] In a second aspect, another embodiment of the present application provides an electrical device comprising the above-mentioned battery.

[0045] In some embodiments, the electrical device includes a processor, which is electrically connected to multiple air pressure sensors; the processor is used to obtain a measurement signal from each air pressure sensor and obtain the air pressure measured by each air pressure sensor based on the measurement signal; the processor is used to determine whether the battery has an air pressure abnormality based on the air pressure measured by the multiple air pressure sensors, and if so, a thermal runaway alarm is issued. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0047] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0048] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0049] FIG3 is a schematic diagram of a three-dimensional structure of a battery according to one or more embodiments;

[0050] FIG4 is a schematic diagram illustrating the distribution of first air pressure sensors of a battery according to one or more embodiments;

[0051] FIG5 is a schematic diagram illustrating the distribution of first air pressure sensors of a battery according to one or more embodiments;

[0052] FIG6 is a schematic diagram illustrating the distribution of second air pressure sensors of a battery according to one or more embodiments;

[0053] 7 is a schematic diagram illustrating the distribution of a third air pressure sensor of a battery according to one or more embodiments;

[0054] FIG8 is a schematic diagram illustrating the distribution of a fourth air pressure sensor of a battery according to one or more embodiments.

[0055] The figure numbers in the specific implementation manner are as follows: 1000a vehicle; 100a battery; 200a controller; 300a motor; 10a casing; 11a first part; 12a second part; 1 battery cell; 100 casing; 110 casing body; 120 end cover; 121 wall; 122 explosion-proof valve; 200 electrode terminal; 201 positive pole; 202 negative pole; 2 shell; 21 first shell wall; 22 lateral shell wall; 23 second shell wall; 24 first side wall; 25 second side wall; 3 air pressure sensor; 3a first air pressure sensor; 3b second air pressure sensor; 3c third air pressure sensor; 3d fourth air pressure sensor. DETAILED DESCRIPTION

[0056] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0058] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0059] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present 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 herein may be combined with other embodiments.

[0060] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0061] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0062] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 the embodiments of the present 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 the embodiments of the present application.

[0063] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0064] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0065] Batteries typically consist of battery cells and air pressure sensors. Air pressure sensors can detect the air pressure inside battery cells, facilitating thermal runaway management. However, in related technologies, gas sensors are typically located inside the battery cell housing. The air pressure inside the battery cell often changes with the cell's operation, making monitoring difficult and inaccurate.

[0066] To reduce the difficulty of monitoring gas pressure to generate a thermal runaway alarm and improve the accuracy of monitoring gas pressure to generate a thermal runaway alarm, the gas sensor can be placed outside the battery cell. That is, the battery can include a housing, battery cells, and a gas pressure sensor; the battery cells are disposed within the housing; and the gas pressure sensor is disposed within the housing at intervals.

[0067] Based on the above considerations, the present application provides a battery and an electrical device. Through the above-described method, an air pressure sensor can be used to monitor the air pressure outside a battery cell and provide a thermal runaway alarm. The air pressure outside a battery cell is more stable than the air pressure inside the cell. Therefore, monitoring the air pressure outside a battery cell to provide a thermal runaway alarm is less difficult and more accurate.

[0068] The battery disclosed in the embodiments of the present application can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle 1000a as an example of an electrical device according to an embodiment of the present application.

[0070] Referring to Figure 1, vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100a is provided inside vehicle 1000a. Battery 100a can be provided at the bottom, head, or tail of vehicle 1000a. Battery 100a can be used to power vehicle 1000a. For example, battery 100a can serve as an operating power source for vehicle 1000a. Vehicle 1000a can also include a controller 200a and a motor 300a. Controller 200a is used to control battery 100a to power motor 300a, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000a.

[0071] In some embodiments of the present application, the battery 100a can serve not only as an operating power source for the vehicle 1000a, but also as a driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0072] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0073] The battery 100 a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

[0074] In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. Each battery cell 1 may also be a primary battery.

[0075] The battery cell 1 includes, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The battery cell 1 may be cylindrical, flat, rectangular, or have other shapes.

[0076] In some embodiments, the battery 100 a may be a battery module. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery module.

[0077] In some embodiments, referring to FIG. 2 , the battery 100 a may be a battery pack, which includes a housing 10 a and battery cells 1 . The battery cells 1 or battery modules are housed in the housing 10 a .

[0078] In some embodiments, the box 10a can serve as part of the chassis structure of the vehicle 1000a. For example, a portion of the box 10a can become at least a portion of the floor of the vehicle 1000a, or a portion of the box 10a can become at least a portion of the cross member and longitudinal member of the vehicle 1000a.

[0079] Referring to Figure 2, the battery 100a includes a housing 10a and a battery cell 1, and the battery cell 1 is accommodated in the housing 10a. The housing 10a is used to provide a storage space for the battery cell 1, and the housing 10a can adopt a variety of structures. In some embodiments, the housing 10a can include a first portion 11a and a second portion 12a, and the first portion 11a and the second portion 12a cover each other, and the first portion 11a and the second portion 12a jointly define a storage space for accommodating the battery cell 1. The second portion 12a can be a hollow structure with one end open, and the first portion 11a can be a plate-like structure, and the first portion 11a covers the open side of the second portion 12a, so that the first portion 11a and the second portion 12a jointly define a storage space; the first portion 11a and the second portion 12a can also be hollow structures with one side open, and the open side of the first portion 11a covers the open side of the second portion 12a. Of course, the box body 10a formed by the first part 11a and the second part 12a can be in various shapes, such as a cylinder, a cuboid, etc.

[0080] In battery 100a, there may be multiple battery cells 1, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 1. Multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 1 may be housed within the housing 10a. Alternatively, battery 100a may comprise multiple battery cells 1 connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 10a. Battery 100a may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 1.

[0081] Referring to Figures 3 and 4 , a battery cell 1 is the smallest unit of a battery. In this embodiment, a cylindrical battery cell 1 is used as an example. As shown in Figures 3 and 4 , a battery cell 1 includes a housing 100 , an electrode assembly, and other functional components.

[0082] In some embodiments, the housing 100 is used to encapsulate components such as the electrode assembly and the electrolyte. The housing 100 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0083] The housing 100 may include an end cap 120 and a housing body 110. The end cap 120 refers to a component that covers the opening of the housing body 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the housing body 110 to match the housing body 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 120 is not easily deformed when squeezed or collided, so that the battery cell 1 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 200 may be provided on the end cap 120. The electrode terminal 200 can be used to electrically connect to the electrode assembly for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cap 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 120 can also be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component can be disposed inside the end cap 120 to isolate the electrical connection components within the housing body 110 from the end cap 120 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, etc.

[0084] The housing body 110 is a component that cooperates with the end cap 120 to form the internal environment of the battery cell 1. This internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The housing body 110 and the end cap 120 can be separate components. An opening can be provided in the housing body 110, and the end cap 120 is placed over the opening to form the internal environment of the battery cell 1. Alternatively, the end cap 120 and the housing body 110 can be integrated. Specifically, the end cap 120 and the housing body 110 can form a common connection surface before other components are inserted into the housing. When the interior of the housing body 110 is to be enclosed, the end cap 120 is placed over the housing body 110. The housing body 110 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing body 110 can be determined based on the specific shape and size of the electrode assembly. The housing body 110 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0085] The electrode assembly is a component where electrochemical reactions occur in the battery cell 1. The housing body 110 may contain one or more electrode assemblies.

[0086] In some embodiments, the electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0087] 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.

[0088] 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.

[0089] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. 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 a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] 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 their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM311), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can 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 a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] 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.

[0094] 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.

[0095] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0096] 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.

[0097] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0098] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0099] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0100] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0101] 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.

[0102] The liquid electrolyte includes an electrolyte salt and a solvent.

[0103] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0104] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0105] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0106] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0107] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0108] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0109] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0110] 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.

[0111] In some embodiments, the electrode assembly is provided with tabs that conduct current away from the electrode assembly. These tabs include positive and negative tabs. The positive and negative tabs can be located together at one end of the main body or separately at opposite ends. During the charge and discharge process of battery 100a, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current circuit.

[0112] According to one or more embodiments of the present application, referring to FIG3 , a battery 100a may include a housing 2, a battery cell 1, and multiple air pressure sensors 3. The battery cell 1 is disposed within the housing 2. The multiple air pressure sensors 3 may be used to detect air pressure at different locations within the housing 2. Optionally, the multiple air pressure sensors 3 may be spaced apart within the housing 2. At least two air pressure sensors 3 may be located on different sides of the battery cell 1.

[0113] Among them, the air pressure sensor 3 can refer to a sensor that can be used to measure the magnitude of gas pressure, which can output an air pressure signal used to characterize the magnitude of gas pressure. In other words, the air pressure sensor 3 can output an air pressure signal that matches the gas pressure. When the gas pressure is different, the air pressure sensor 3 can output different air pressure signals. The air pressure signal can be obtained by the battery cell 1, battery module or vehicle processor (processing circuit). In some embodiments, the housing 2 can be a box 10a.

[0114] In the above manner, the air pressure sensor 3 can be used to monitor the air pressure outside the battery cell 1 and issue a thermal runaway alarm. In addition, the air pressure inside the battery cell 1 may change as the battery operates. Therefore, using the air pressure sensor 3 to monitor the air pressure inside the battery cell 1 and issue a thermal runaway alarm may be difficult and inaccurate. The air pressure outside the battery cell 1 is more stable than the air pressure inside the battery cell 1. Therefore, monitoring the air pressure outside the battery cell 1 and issuing a thermal runaway alarm is less difficult and more accurate. In addition, gas leaks may occur at different locations on the battery cell. The presence of multiple air pressure sensors 3 allows for more comprehensive monitoring of the air pressure at different locations outside the battery cell 1, enabling a more accurate thermal runaway alarm.

[0115] According to some embodiments of the present application, optionally, multiple air pressure sensors 3 form a three-dimensional air pressure detection array inside the shell 2. Multiple air pressure sensors 3 are not located on the same plane at the same time. Among them, the air pressure detection array can also be understood as a collection of multiple air pressure sensors 3 or a group of air pressure sensors 3. In the above manner, the air pressure detection array can more comprehensively monitor the air pressure at various positions outside the battery cell 1 (inside the shell 2), and then when the air pressure at any of the above positions is abnormal, it can detect the air pressure change in a timely and accurate manner, thereby facilitating a thermal runaway alarm.

[0116] According to some embodiments of the present application, optionally, referring to FIG3 , the battery cell 1 includes a wall portion 121 and an explosion-proof valve 122. The explosion-proof valve 122 is provided on the wall portion 121. Among them, the explosion-proof valve 122 is a pressure relief device commonly used in systems containing flammable media. When the pressure in the system exceeds a threshold value, the explosion-proof valve 122 breaks to relieve pressure, reducing the possibility of system explosion or reducing the power of the system explosion. The wall portion 121 may refer to the end cover 120 of the battery cell 1 or the installation area of ​​the shell 2. That is, the explosion-proof valve 122 may be provided on the end cover 120 or the shell 2 of the battery cell 1.

[0117] According to some embodiments of the present application, optionally, referring to FIG3 , the shell 2 includes a first shell wall 21, a lateral shell wall 22, and a second shell wall 23. The lateral shell wall 22 is connected between the first shell wall 21 and the second shell wall 23. The first shell wall 21 and the wall portion 121 are arranged relative to each other. The multiple air pressure sensors 3 include at least one first air pressure sensor 3a. At least one first air pressure sensor 3a is arranged on the first shell wall 21 or the wall portion 121. Normally, when the battery is about to thermally runaway, the air pressure change near the explosion-proof valve 122 will be ahead of other areas. Therefore, through the above method, at least one first air pressure sensor 3a can be arranged between the first shell wall 21 and the wall portion 121, so that when the explosion-proof valve 122 cracks and releases gas, it can sensitively identify the air pressure change in the area between the first shell wall 21 of the shell 2 and the wall portion 121 of the battery cell 1, thereby facilitating thermal runaway alarm.

[0118] According to some embodiments of the present application, optionally, referring to FIG. 4 or FIG. 5 , at least one first air pressure sensor 3a is disposed on the first housing wall 21. The orthographic projection of each first air pressure sensor 3a on the plane of the wall portion 121 falls within the explosion-proof valve 122. In this manner, the at least one first air pressure sensor 3a can be directly opposite the explosion-proof valve 122. When the explosion-proof valve 122 ruptures to release gas, the at least one first air pressure sensor 3a can more sensitively detect changes in air pressure.

[0119] According to some embodiments of the present application, optionally, referring to FIG4 , there are multiple battery cells 1. Multiple battery cells 1 are arranged in an array. There are multiple first air pressure sensors 3a. Multiple first air pressure sensors 3a are arranged at intervals. The orthographic projection of each first air pressure sensor 3a on the plane where the wall 121 is located falls into an explosion-proof valve 122. In the above manner, multiple first air pressure sensors 3a can be respectively arranged opposite to the explosion-proof valves 122 of multiple battery cells 1, so when any explosion-proof valve 122 in the multiple battery cells 1 cracks to release gas, the corresponding first air pressure sensor 3a can sensitively monitor the air pressure change, and then perform a thermal runaway alarm.

[0120] According to some embodiments of the present application, optionally, referring to FIG5 , the number of battery cells 1 is multiple. Multiple battery cells 1 are arranged in an array. The orthographic projection of each first air pressure sensor 3a on the plane where the wall 121 is located falls between the explosion-proof valves 122 of two adjacent battery cells 1. In this case, assuming that the number of battery cells 1 is N, the number of first air pressure sensors 3a can be between N / 2 and N-1. Compared with the one-to-one correspondence between the first air pressure sensor 3a and the battery cell 1 (explosion-proof valve 122), the number of first air pressure sensors 3a can be reduced to a certain extent. In the above manner, each first air pressure sensor 3a is arranged between the explosion-proof valves 122 of two adjacent battery cells 1, which can effectively monitor the air pressure changes near the explosion-proof valves 122 of the two battery cells 1, thereby reducing the number of first sensors to a certain extent, thereby reducing the production cost of the battery.

[0121] According to some embodiments of the present application, at least one first air pressure sensor 3a is optionally disposed in an area opposite to the first shell wall 21 and the wall portion 121. In this manner, the first air pressure sensor 3a can relatively sensitively and accurately monitor changes in air pressure in the area between the first shell wall 21 of the housing 2 and the wall portion 121 of the battery cell 1, thereby enabling sensitive thermal runaway alarms.

[0122] According to some embodiments of the present application, as shown in FIG6 , the plurality of air pressure sensors 3 may optionally include at least one second air pressure sensor 3b. The at least one second air pressure sensor 3b is disposed at the junction of the first shell wall 21 and the lateral shell wall 22. In this manner, the second air pressure sensor 3b can further monitor air pressure changes at the junction of the first shell wall 21 and the lateral shell wall 22, thereby improving the accuracy of the thermal runaway alarm to a certain extent.

[0123] According to some embodiments of the present application, the junction of the first shell wall 21 and the lateral shell wall 22 optionally has multiple corner locations. Each second air pressure sensor 3b is disposed at a corner location. In this manner, multiple second air pressure sensors 3b can be disposed at multiple corner locations between the first shell wall 21 and the lateral shell wall 22, thereby enabling comprehensive monitoring of the air pressure at multiple corner locations, thereby improving the accuracy of thermal runaway alarms.

[0124] According to some embodiments of the present application, as shown in FIG7 , the plurality of air pressure sensors 3 may optionally include at least one third air pressure sensor 3c. The at least one third sensor is disposed on the lateral housing wall 22. In this manner, the third air pressure sensor 3c can further monitor air pressure changes between the lateral housing wall 22 and the battery cell 1, thereby improving the accuracy of thermal runaway alarms to a certain extent.

[0125] According to some embodiments of the present application, the number of third air pressure sensors 3c is optionally less than the number of first air pressure sensors 3a. In this way, more first air pressure sensors 3a are set in the area where air pressure changes are more likely to occur first during thermal runaway (i.e., between the wall portion 121 and the first shell wall 21), while fewer third air pressure sensors 3c are set in the area where the probability of air pressure changes occurring first during thermal runaway is lower. This allows for more sensitive and accurate monitoring of air pressure changes between the shell 2 and the battery cell 1, while also reducing the number of air pressure sensors 3 to a certain extent, thereby reducing the production cost of the battery.

[0126] According to some embodiments of the present application, optionally, there are multiple third air pressure sensors 3c and they are divided into multiple groups. Each group of third air pressure sensors 3c is arranged at intervals on the lateral shell wall 22 around the circumference of the battery cell 1. Multiple groups of third air pressure sensors 3c are arranged at intervals along the direction from the first shell wall 21 to the second shell wall 23. In two adjacent groups of third air pressure sensors 3c, the number of third air pressure sensors 3c in the group close to the first shell wall 21 is greater than the number of third air pressure sensors 3c in the group close to the second shell wall 23. Through the above method, the setting density of the third air pressure sensors 3c gradually decreases along the direction from the first shell wall 21 to the second shell wall 23. The number of third air pressure sensors 3c on the side close to the first shell wall 21 is large, which can relatively sensitively and comprehensively monitor the air pressure changes in this area. The number of third air pressure sensors 3c on the side close to the second shell wall 23 is small, which can reduce the production cost of the battery to a certain extent without significantly reducing the accuracy of the thermal runaway alarm.

[0127] According to some embodiments of the present application, the ratio of the number of third air pressure sensors 3c to the area of ​​the first housing wall 21 is optionally smaller than the ratio of the number of first air pressure sensors 3a to the area of ​​the lateral housing wall 22. In this manner, the density of the first air pressure sensors 3a disposed on the first housing wall 21 is greater than the density of the second air pressure sensors 3b disposed on the lateral housing wall 22. This allows for more sensitive detection of air pressure changes in the area near the first housing wall 21 and more accurate detection of air pressure changes in the area near the lateral housing wall 22. Furthermore, the number of third air pressure sensors 3c used can be reduced to a certain extent, thereby reducing battery production costs.

[0128] According to some embodiments of the present application, optionally, referring to FIG7 , the lateral shell wall 22 includes two first side walls 24 and two second side walls 25. The two first side walls 24 are arranged opposite to each other. The two second side walls 25 are arranged opposite to each other and are respectively connected to the two first side walls 24. The area of ​​the first side wall 24 is larger than the area of ​​the second side wall 25. Optionally, at least part of the third air pressure sensors 3c are arranged in an array on at least one of the two first side walls 24. Optionally, at least another part of the third air pressure sensors 3c are arranged in an array on at least one of the two second side walls 25. In the above manner, part of the third air pressure sensors 3c can be used to monitor the air pressure in the area between the first side wall 24 and the battery cell 1, and another part of the third air pressure sensors 3c can be used to monitor the air pressure in the area between the second side wall 25 and the battery cell 1, thereby further monitoring the air pressure changes in the area between the lateral shell wall 22 and the battery cell 1, thereby improving the accuracy of the thermal runaway alarm.

[0129] According to some embodiments of the present application, optionally, as shown in FIG8 , the plurality of air pressure sensors 3 include at least one fourth air pressure sensor 3d. The at least one fourth air pressure sensor 3d is disposed on the second shell wall 23. The number of fourth air pressure sensors 3d is less than the number of third air pressure sensors 3c. In this manner, the fourth air pressure sensor 3d can further monitor air pressure changes in the area between the second shell wall 23 and the battery cell 1, thereby improving the accuracy of thermal runaway alarms. Furthermore, the smaller number of fourth air pressure sensors can reduce the production cost of the battery to a certain extent.

[0130] According to some embodiments of the present application, optionally, the battery cell 1 includes a positive electrode column 201 and a negative electrode column 202 (i.e., the above-mentioned electrode terminal 200). The battery includes a circuit board. The circuit board is arranged in the housing 2. The circuit board is electrically connected to the positive electrode column 201 and the negative electrode column 202. The circuit board is provided with a voltage conversion module. The battery is electrically connected to the multiple air pressure sensors 3 through the voltage conversion module to power the multiple air pressure sensors 3. In the above manner, using the battery cell 1 to power the air pressure sensor 3 can improve the integration of the battery.

[0131] According to some embodiments of the present application, the battery optionally includes a power supply independent of the battery cells 1. The power supply is disposed within the housing 2. The power supply is electrically connected to the plurality of air pressure sensors 3 to provide power to the plurality of air pressure sensors 3. In this manner, the power supply can stably supply power to the air pressure sensors 3 independently of the other battery cells 1.

[0132] According to some embodiments of the present application, the battery cell 1 optionally includes a processor. The processor is disposed within the housing 2. The processor is electrically connected to multiple air pressure sensors 3. The processor can be configured to obtain a measurement signal from each air pressure sensor 3 and, based on the measurement signal, determine the air pressure measured by each air pressure sensor 3. Furthermore, the processor is configured to determine whether the battery has an air pressure anomaly based on the air pressures measured by the multiple air pressure sensors 3, and if so, initiate a thermal runaway alarm.

[0133] In some embodiments, the processor of the battery cell 1 is used to determine whether the air pressure measured by each air pressure sensor 3 is greater than or equal to a first preset threshold. If the air pressure measured by at least one air pressure sensor 3 is greater than or equal to the first preset threshold, it is determined that the battery has an air pressure abnormality.

[0134] Furthermore, if the air pressure measured by each air pressure sensor 3 is less than the first preset threshold, the processor is configured to determine whether the air pressure measured by each air pressure sensor 3 is greater than or equal to a second preset threshold; and if the air pressure measured by at least two air pressure sensors 3 is greater than or equal to the second preset threshold, it is determined that an air pressure abnormality has occurred in the battery. The second preset threshold is less than the first preset threshold.

[0135] Optionally, if the air pressure measured by more than two-thirds of the multiple air pressure sensors 3 is greater than or equal to a second preset threshold, it is determined that the battery has an air pressure abnormality.

[0136] In a second aspect, another embodiment of the present application provides an electrical device comprising the aforementioned battery. The electrical device may be an electronic device such as a car, a mobile phone, or headphones. Optionally, the electrical device includes a processor electrically connected to a plurality of air pressure sensors 3 ; the processor is configured to obtain a measurement signal from each air pressure sensor 3 , and obtain the air pressure measured by each air pressure sensor 3 based on the measurement signal; the processor is configured to determine whether the battery has an air pressure anomaly based on the air pressures measured by the plurality of air pressure sensors 3 , and if so, to issue a thermal runaway alarm.

[0137] Specifically, in some embodiments, the processor of the electrical device is used to determine whether the air pressure measured by each air pressure sensor 3 is greater than or equal to a first preset threshold value. If the air pressure measured by at least one air pressure sensor 3 is greater than or equal to the first preset threshold value, it is determined that the battery has an air pressure abnormality.

[0138] Furthermore, if the air pressure measured by each air pressure sensor 3 is less than the first preset threshold, the processor is configured to determine whether the air pressure measured by each air pressure sensor 3 is greater than or equal to a second preset threshold; and if the air pressure measured by at least two air pressure sensors 3 is greater than or equal to the second preset threshold, it is determined that an air pressure abnormality has occurred in the battery. The second preset threshold is less than the first preset threshold.

[0139] Optionally, if the air pressure measured by more than two-thirds of the multiple air pressure sensors 3 is greater than or equal to a second preset threshold, it is determined that the battery has an air pressure abnormality.

[0140] In summary, according to some embodiments of the present application, the electrical device may include a battery. The battery may include a housing 2, a battery cell 1, and multiple air pressure sensors 3; the battery cell 1 is disposed within the housing 2; the multiple air pressure sensors 3 are spaced apart within the housing 2, with at least two air pressure sensors 3 located on different sides of the battery cell 1. The multiple air pressure sensors 3 are configured to detect air pressure at different locations within the housing 2. The multiple air pressure sensors 3 form a three-dimensional array of air pressure detection points within the housing 2, and the multiple air pressure sensors 3 are not located on the same plane. The battery cell 1 may include a wall 121 and an explosion-proof valve 122, with the explosion-proof valve 122 disposed within the wall 121. The housing 2 may include a first wall 21, a lateral wall 22, and a second wall 23, with the lateral wall 22 connected between the first wall 21 and the second wall 23. The first wall 21 and the wall 121 are disposed opposite each other. The multiple air pressure sensors 3 include at least one first air pressure sensor 3a, disposed within the first wall 21 or the wall 121. At least one first air pressure sensor 3a is disposed in the area opposite the first shell wall 21 and the wall portion 121. Furthermore, there are multiple battery cells 1, which are arranged in an array. There are multiple first air pressure sensors 3a, which are spaced apart. The orthographic projection of each first air pressure sensor 3a on the plane of the wall portion 121 can fall within an explosion-proof valve 122 or between the explosion-proof valves 122 of two adjacent battery cells 1.

[0141] The multiple air pressure sensors 3 may further include at least one second air pressure sensor 3b, which is disposed at the junction of the first shell wall 21 and the lateral shell wall 22. The junction of the first shell wall 21 and the lateral shell wall 22 has multiple corner locations, and each second air pressure sensor 3b may be disposed at a corner location. Furthermore, the multiple air pressure sensors 3 may further include at least one third air pressure sensor 3c, which is disposed at the lateral shell wall 22. The number of third air pressure sensors 3c may be less than the number of first air pressure sensors 3a. Furthermore, the number of third air pressure sensors 3c is multiple and divided into multiple groups, with each group of third air pressure sensors 3c spaced apart around the circumference of the battery cell 1 on the lateral shell wall 22. The multiple groups of third air pressure sensors 3c are spaced apart along the direction from the first shell wall 21 to the second shell wall 23. Of the two adjacent groups of third air pressure sensors 3c, the number of third air pressure sensors 3c in the group closer to the first shell wall 21 is greater than the number of third air pressure sensors 3c in the group closer to the second shell wall 23. Furthermore, the ratio of the number of first air pressure sensors 3a to the area of ​​the first housing wall 21 is greater than the ratio of the number of third air pressure sensors 3c to the area of ​​the lateral housing wall 22. Furthermore, the lateral housing wall 22 may include two first sidewalls 24 and two second sidewalls 25, with the two first sidewalls 24 disposed opposite each other and the two second sidewalls 25 disposed opposite each other and respectively connected to the two first sidewalls 24; the area of ​​the first sidewalls 24 is greater than the area of ​​the second sidewalls 25; at least some of the third air pressure sensors 3c are arranged in an array on at least one of the two first sidewalls 24; and / or at least another portion of the third air pressure sensors 3c are arranged in an array on at least one of the two second sidewalls 25. Furthermore, the multiple air pressure sensors 3 may further include at least one fourth air pressure sensor 3d, disposed on the second housing wall 23; the number of fourth air pressure sensors 3d is less than the number of third air pressure sensors 3c.

[0142] The battery cell 1 may include a positive electrode column 201 and a negative electrode column 202. The battery includes a circuit board, which is disposed within the housing 2 and electrically connected to the positive electrode column 201 and the negative electrode column 202. The circuit board is provided with a voltage conversion module. The battery is electrically connected to the multiple air pressure sensors 3 via the voltage conversion module to provide power to the multiple air pressure sensors 3. In other embodiments, the battery includes a power supply independent of the battery cell 1, which is disposed within the housing 2 and electrically connected to the multiple air pressure sensors 3 to provide power to the multiple air pressure sensors 3.

[0143] Among them, at least one of the battery cell 1 and the electrical device may also include a processor, which is electrically connected to multiple air pressure sensors 3; the processor is used to obtain the measurement signal of each air pressure sensor 3, and obtain the air pressure measured by each air pressure sensor 3 according to the measurement signal; the processor is used to determine whether the battery has an air pressure abnormality based on the air pressure measured by the multiple air pressure sensors 3, and if so, a thermal runaway alarm is issued.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: case; A battery cell is disposed inside the housing; A plurality of air pressure sensors are arranged at intervals inside the shell, at least two of the air pressure sensors are located outside different sides of the battery cell, and the plurality of air pressure sensors are respectively used to detect the air pressure at different positions inside the shell.

2. The battery according to claim 1, characterized in that The multiple air pressure sensors form a three-dimensional air pressure detection dot matrix inside the shell, and the multiple air pressure sensors are not located on the same plane at the same time.

3. The battery according to claim 1 or 2, characterized in that: The battery cell includes a wall portion and an explosion-proof valve, and the explosion-proof valve is arranged on the wall portion; the shell includes a first shell wall, a lateral shell wall and a second shell wall, and the lateral shell wall is connected between the first shell wall and the second shell wall; the first shell wall and the wall portion are arranged opposite to each other; the multiple air pressure sensors include at least one first air pressure sensor; the at least one first air pressure sensor is arranged on the first shell wall or the wall portion.

4. The battery according to claim 3, characterized in that The at least one first air pressure sensor is arranged on the first shell wall, and the orthographic projection of the at least one first air pressure sensor on the plane where the wall portion is located falls into the explosion-proof valve.

5. The battery according to claim 4, characterized in that There are multiple battery cells, which are arranged in an array; there are multiple first air pressure sensors, which are arranged at intervals; and the orthographic projection of each first air pressure sensor on the plane where the wall portion is located falls into one of the explosion-proof valves.

6. The battery according to claim 3, characterized in that There are multiple battery cells, which are arranged in an array; the orthographic projection of each of the first air pressure sensors on the plane where the wall portion is located falls between the explosion-proof valves of two adjacent battery cells.

7. The battery according to claim 3, characterized in that The at least one first air pressure sensor is disposed in a region where the first shell wall and the wall portion are disposed opposite to each other.

8. The battery according to claim 4, characterized in that The plurality of air pressure sensors include at least one second air pressure sensor, and the at least one second air pressure sensor is disposed at a connection between the first shell wall and the lateral shell wall.

9. The battery according to claim 8, characterized in that The connection between the first shell wall and the lateral shell wall has a plurality of corner positions, and each of the second air pressure sensors is arranged at one of the corner positions.

10. The battery according to claim 3, characterized in that The plurality of air pressure sensors include at least one third air pressure sensor, and the at least one third sensor is disposed on the lateral shell wall.

11. The battery according to claim 10, characterized in that The number of the third air pressure sensors is less than the number of the first air pressure sensors.

12. The battery according to claim 10, characterized in that The number of the third air pressure sensors is multiple and divided into multiple groups, and each group of the third air pressure sensors is arranged at intervals on the lateral shell wall around the circumference of the battery cell; multiple groups of the third air pressure sensors are arranged at intervals along the direction from the first shell wall to the second shell wall; in two adjacent groups of the third air pressure sensors, the number of the third air pressure sensors in the group close to the first shell wall is greater than that of the third air pressure sensors in the group close to the second shell wall The number of 13. The battery according to claim 10, characterized in that A ratio of the number of the first air pressure sensors to the area of ​​the first shell wall is greater than a ratio of the number of the third air pressure sensors to the area of ​​the lateral shell wall.

14. The battery according to claim 10, characterized in that The lateral shell wall includes two first side walls and two second side walls, the two first side walls are arranged opposite to each other, and the two second side walls are arranged opposite to each other and are respectively connected to the two first side walls; the area of ​​the first side wall is greater than the area of ​​the second side wall; At least part of the third air pressure sensors are arranged in an array on at least one of the two first side walls; And / or, at least another portion of the third air pressure sensors are arranged in an array on at least one of the two second side walls.

15. The battery according to claim 10, characterized in that The plurality of air pressure sensors include at least one fourth air pressure sensor, and the at least one fourth air pressure sensor is disposed on the second shell wall; the number of the fourth air pressure sensors is less than the number of the third air pressure sensors.

16. The battery according to claim 1, characterized in that The battery cell includes a positive electrode column and a negative electrode column, and the battery includes a circuit board, which is arranged in the shell and electrically connected to the positive electrode column and the negative electrode column. The circuit board is provided with a voltage conversion module; the battery is electrically connected to the multiple air pressure sensors through the voltage conversion module to power the multiple air pressure sensors.

17. The battery according to claim 1, characterized in that The battery includes a power supply independent of the battery cells, the power supply is disposed in the housing, and the power supply is electrically connected to the plurality of air pressure sensors to supply power to the plurality of air pressure sensors.

18. The battery according to claim 1, characterized in that The battery cell includes a processor, the processor is disposed in the housing, and the processor is electrically connected to the plurality of air pressure sensors; the processor is used to obtain a measurement signal of each of the air pressure sensors, and obtain the air pressure measured by each of the air pressure sensors according to the measurement signal; The processor is used to determine whether the battery has abnormal air pressure according to the air pressure measured by the multiple air pressure sensors, and if so, issue a thermal runaway alarm.

19. An electrical device, characterized in that: Comprising a battery as described in any one of claims 1-18.

20. The electrical device according to claim 19, characterized in that: The electrical device includes a processor, which is electrically connected to the plurality of air pressure sensors; the processor is used to obtain a measurement signal from each of the air pressure sensors, and obtain the air pressure measured by each of the air pressure sensors according to the measurement signal; The processor is used to determine whether the battery has abnormal air pressure according to the air pressure measured by the multiple air pressure sensors, and if so, issue a thermal runaway alarm.

Images