CN116780009A

CN116780009A - Battery and electricity utilization device

Info

Publication number: CN116780009A
Application number: CN202311075799.6A
Authority: CN
Inventors: 吴凯; 张继君; 冯婷; 王少飞; 魏奕民; 欧阳楚英
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2023-09-19
Anticipated expiration: 2043-08-25
Also published as: CN116780009B

Abstract

The application provides a battery and an electric device, wherein the battery comprises a shell, a battery monomer and a plurality of air pressure sensors; the battery monomer is arranged in the shell; the air pressure sensors are arranged in the shell at intervals, at least two air pressure sensors are positioned outside different sides of the battery cell, and the air pressure sensors are respectively used for detecting air pressure at different positions in the shell; the air pressure sensors form a three-dimensional air pressure detection lattice in the shell, and are not located on the same plane at the same time. Through the mode, the accuracy of thermal runaway alarming by using the air pressure sensor can be improved.

Description

Battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery and an electric device.

Background

With the development of battery technology, battery cells are applied to more and more fields, and gradually replace the traditional petrochemical energy sources in the field of automobile power. The battery cells may store chemical energy and controllably convert the chemical energy into electrical energy. In the recyclable battery cell, the active material can be activated by means of charging after discharge to continue use.

In the use of batteries, thermal runaway management of the battery is critical. In general, the air pressure is monitored by an air pressure sensor, and the air pressure sensor can be used for early warning or alarming for thermal runaway and the like. However, at present, based on the air pressure detection of the air pressure sensor to the inside of the battery, the detection position is single, and the problem of insufficient accuracy exists.

Furthermore, the foregoing description is provided merely for background information related to the present application and does not necessarily constitute prior art.

Disclosure of Invention

In view of the above, the present application provides a battery and an electric device capable of improving the accuracy of thermal runaway warning using an air pressure sensor.

In a first aspect, one embodiment of the present application provides a battery comprising a housing, a battery cell, and a plurality of air pressure sensors; the battery monomer is arranged in the shell; the air pressure sensors are arranged in the shell at intervals, at least two air pressure sensors are positioned outside different sides of the battery cell, and the air pressure sensors are respectively used for detecting air pressure at different positions in the shell; the air pressure sensors form a three-dimensional air pressure detection lattice in the shell, and are not located on the same plane at the same time.

By the mode, the air pressure sensor can be used for monitoring the air pressure outside the battery cell to give out a thermal runaway alarm. In addition, the air pressure outside the battery cell is more stable than the air pressure inside the battery cell, so that the accuracy of monitoring the air pressure outside the battery cell for thermal runaway alarm can be relatively high. In addition, gas leakage is likely to occur at different positions on the battery unit, the number of the air pressure sensors is multiple, air pressures at different positions outside the battery unit can be monitored more comprehensively, and then thermal runaway alarm can be carried out more accurately. In addition, the air pressure detection lattice can monitor the air pressure of each position outside the battery unit (in the shell) more comprehensively, so that when the air pressure at any position is abnormal, the change of the air pressure can be timely and accurately detected, and the thermal runaway alarm can be conveniently carried out.

In some embodiments, the battery cell includes a wall portion and an explosion-proof valve disposed in the wall portion; the shell comprises a first shell wall, a lateral shell wall and a second shell wall, wherein the lateral shell wall is connected between the first shell wall and the second shell wall; the first shell wall and the wall part are oppositely arranged; the plurality of air pressure sensors includes at least one first air pressure sensor; at least one first air pressure sensor is disposed on the first housing wall or wall portion.

Through the mode, at least one first air pressure sensor can be arranged between the first shell wall and the wall part, so that when the explosion-proof valve is cracked to release gas, the air pressure change of the area between the first shell wall of the shell and the wall part of the battery cell can be sensitively identified, and further, the thermal runaway alarm can be conveniently carried out.

In some embodiments, at least one first air pressure sensor is disposed on the first housing wall, and an orthographic projection of each first air pressure sensor on a plane on which the wall portion is located falls into the explosion-proof valve.

In this way, the at least one first air pressure sensor can be opposite to the explosion-proof valve, and the at least one first air pressure sensor can detect air pressure change more sensitively when the explosion-proof valve cracks to release air.

In some embodiments, the number of battery cells is a plurality, and the plurality of battery cells are arranged in a row; the number of the first air pressure sensors is multiple, and the first air pressure sensors are arranged at intervals; the orthographic projection of each first air pressure sensor on the plane of the wall part falls into an explosion-proof valve.

Through the mode, the plurality of first air pressure sensors can be arranged opposite to the explosion-proof valves of the plurality of battery cells respectively, so that when any one of the explosion-proof valves of the plurality of battery cells cracks to release gas, the corresponding first air pressure sensor can sensitively monitor air pressure change, and further, thermal runaway alarm is carried out.

In some embodiments, the number of battery cells is a plurality, and the plurality of battery cells are arranged in a row; the orthographic projection of each first air pressure sensor on the plane of the wall part falls into the space between the explosion-proof valves of two adjacent battery cells.

Through the mode, each first air pressure sensor is arranged between the explosion-proof valves of two adjacent battery monomers, can effectively monitor air pressure changes near the explosion-proof valves of the two battery monomers, and then can reduce the number of the first sensors to a certain extent, and further reduce the generation cost of the battery.

In some embodiments, at least one first air pressure sensor is disposed in an area of the first housing wall disposed opposite the wall portion.

By the mode, the first air pressure sensor can sensitively and accurately monitor the air pressure change of the area between the first shell wall of the shell and the wall part of the battery cell, and further can sensitively give out a thermal runaway alarm.

In some embodiments, the plurality of air pressure sensors includes at least one second air pressure sensor disposed at a junction of the first housing wall and the lateral housing wall.

Through the mode, the second air pressure sensor can further monitor the air pressure change of the joint of the first shell wall and the lateral shell wall, and further can improve the accuracy of thermal runaway alarm to a certain extent.

In some embodiments, the junction of the first housing wall and the lateral housing wall has a plurality of corner locations, and each of the second air pressure sensors is disposed at one of the corner locations.

Through the mode, the plurality of second air pressure sensors can be respectively arranged at a plurality of corner positions between the first shell wall and the lateral shell wall, so that air pressure at the plurality of corner positions can be comprehensively monitored, and the accuracy of thermal runaway alarming is improved.

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

Through the mode, the third air pressure sensor can further monitor the air pressure change between the lateral shell wall and the battery cell, and further can improve the accuracy of thermal runaway alarm to a certain extent.

In some embodiments, the number of third barometric pressure sensors is less than the number of first barometric pressure sensors.

Through the mode, more first air pressure sensors are arranged in the areas (namely between the wall parts and the first shell walls) which are more likely to be subjected to air pressure change during thermal runaway, and fewer third air pressure sensors are arranged in the areas with smaller air pressure change probability during thermal runaway, namely the air pressure change between the shell and the battery cell can be sensitively and accurately monitored, the number of the air pressure sensors can be reduced to a certain extent, and the generation cost of the battery is further reduced.

In some embodiments, the number of the third air pressure sensors is plural and divided into a plurality of groups, and each group of the third air pressure sensors is arranged on the lateral shell wall at intervals around the circumference of the battery cell; the plurality of groups of third air pressure sensors are arranged at intervals along the direction from the first shell wall to the second shell wall; in the adjacent two sets of third air pressure sensors, the number of the set of third air pressure sensors close to the first shell wall is larger than the number of the set of third air pressure sensors close to the second shell wall.

By the mode, the setting density of the third air pressure sensors gradually decreases along the direction from the first shell wall to the second shell wall, the number of the third air pressure sensors close to one side of the first shell wall is large, the air pressure change of the area can be monitored relatively sensitively and comprehensively, the number of the third air pressure sensors close to one side of the second shell wall is small, and the generation cost of the battery can be reduced to a certain extent on the premise of not obviously reducing the accuracy of the thermal runaway alarm.

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

By the mode, the density of the first air pressure sensor arranged on the first shell wall is larger than that of the second air pressure sensor arranged on the lateral shell wall, so that the air pressure change of the area nearby the first shell wall can be detected more sensitively, and the air pressure change of the area nearby the lateral shell wall can be detected more accurately. In addition, the use of the third air pressure sensor can be reduced to a certain extent, and the production cost of the battery is further reduced.

In some embodiments, the lateral shell wall comprises two first side walls and two second side walls, the two first side walls are oppositely arranged, and the two second side walls are oppositely arranged and respectively connected with the two first side walls; the area of the first side wall is larger than that of the second side wall; at least part of the third air pressure sensors are arranged on at least one of the two first side walls in an array manner; and/or at least one other part of the third air pressure sensor is arranged on at least one of the two second side walls in an array manner.

By the mode, part of the third air pressure sensor can be used for monitoring the air pressure of the area between the first side wall and the battery cell, and the other part of the third air pressure sensor can be used for monitoring the air pressure of the area between the second side wall and the battery cell, so that the air pressure change of the area between the lateral shell wall and the battery cell can be further monitored, and the accuracy of thermal runaway alarming is improved.

In some embodiments, the plurality of air pressure sensors includes at least one fourth air pressure sensor disposed on the second housing wall; the number of fourth air pressure sensors is less than the number of third air pressure sensors.

By the mode, the fourth air pressure sensor can further monitor the air pressure change of the area between the second shell wall and the battery cell so as to improve the accuracy of the thermal runaway alarm. In addition, the number of the fourth sensors is small, so that the generation cost of the battery can be reduced to a certain extent.

In some embodiments, the battery cell comprises a positive pole and a negative pole, the battery comprises a circuit board, the circuit board is arranged on the shell, the circuit board is electrically connected with the positive pole and the negative pole, and the circuit board is provided with a voltage conversion module; the battery is electrically connected with the plurality of air pressure sensors through the voltage conversion module so as to supply power for the plurality of air pressure sensors.

By adopting the mode, the battery monomer is used for supplying power to the air pressure sensor, so that the integration level of the battery can be improved.

In some embodiments, the battery includes a power supply independent of the battery cells, the power supply being disposed in the housing, the power supply being electrically connected to the plurality of air pressure sensors to power the plurality of air pressure sensors.

By the mode, the power supply can stably supply power to the air pressure sensor independently of other battery monomers.

In some embodiments, the battery cell includes a processor disposed in the housing, the processor electrically connected to the plurality of air pressure sensors; the processor is used for acquiring the measurement signal of each air pressure sensor and obtaining the air pressure measured by each air pressure sensor according to the measurement signal; the processor is used for judging whether the air pressure of the battery is abnormal or not according to the air pressures measured by the air pressure sensors, and if so, the processor carries out thermal runaway alarm.

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

In some embodiments, the power device includes a processor electrically connected to the plurality of air pressure sensors; the processor is used for acquiring the measurement signal of each air pressure sensor and obtaining the air pressure measured by each air pressure sensor according to the measurement signal; the processor is used for judging whether the air pressure of the battery is abnormal or not according to the air pressures measured by the air pressure sensors, and if so, the processor carries out thermal runaway alarm.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic structural view of a vehicle according to one or more embodiments;

fig. 2 is an exploded view of a battery according to one or more embodiments;

fig. 3 is a schematic perspective view of a battery according to one or more embodiments;

FIG. 4 is a schematic distribution diagram of a first air pressure sensor of a battery in accordance with one or more embodiments;

FIG. 5 is a schematic distribution diagram of a first air pressure sensor of a battery in accordance with one or more embodiments;

FIG. 6 is a schematic distribution diagram of a second air pressure sensor of a battery in accordance with one or more embodiments;

FIG. 7 is a schematic distribution diagram of a third air pressure sensor of a battery in accordance with one or more embodiments;

fig. 8 is a schematic distribution diagram of a fourth air pressure sensor of a battery in accordance with one or more embodiments.

Reference numerals in the specific embodiments are as follows:

1000a of a vehicle;

a 100a battery; 200a controllers; 300a motor;

10a box body; 11a first part; 12a second part;

1, a battery cell; 100 shells; 110 a housing body; 120 end caps; 121 wall portions; 122 an explosion protection valve; 200 electrode terminals; 201 positive electrode post; 202 a negative electrode column;

2a shell; 21 a first shell wall; 22 lateral shell walls; 23 a second housing wall; 24 a first sidewall; 25 a second sidewall; 3, an air pressure sensor; 3a first air pressure sensor; 3b a second air pressure sensor; 3c a third air pressure sensor; and 3d, a fourth air pressure sensor.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means 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 appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

With the development of battery technology, battery cells are applied to more and more fields, and gradually replace traditional fossil energy sources in the field of automobile power. The battery cells may store chemical energy and controllably convert the chemical energy into electrical energy. In the recyclable battery cell, the active material can be activated by means of charging after discharge to continue use.

The battery typically includes a battery cell and a barometric pressure sensor. The air pressure sensor can detect the air pressure of the battery monomer, so that the thermal runaway management is convenient. However, in the related art, the gas sensor is generally disposed inside the housing of the battery cell, and the air pressure inside the battery cell often varies along with the operation of the battery cell, so that there are problems of high monitoring difficulty and low accuracy.

In order to improve the difficulty of the thermal runaway alarm caused by reducing the monitoring air pressure and improve the accuracy of the thermal runaway alarm caused by the monitoring air pressure, the gas sensor can be arranged outside the battery unit. That is, the battery may include a case, a battery cell, and a barometric sensor; the battery monomer is arranged in the shell; the air pressure sensor is arranged in the shell at intervals.

Based on the above considerations, the present application provides a battery and an electrical device. By the mode, the air pressure sensor can be used for monitoring the air pressure outside the battery cell to give out a thermal runaway alarm. The outside atmospheric pressure of battery monomer is more stable than the inside atmospheric pressure of battery monomer, therefore the degree of difficulty that monitoring the outside atmospheric pressure of battery monomer carries out the thermal runaway warning is less, and the accuracy can be higher relatively moreover.

The battery disclosed by the embodiment of the application can be used for an electric device using the battery as a power supply or various energy storage systems using the battery as an energy storage element. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000 a.

Referring to fig. 1, a vehicle 1000a may be a fuel-oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The battery 100a is provided inside the vehicle 1000a, and the battery 100a may be provided at the bottom or the head or the tail of the vehicle 1000 a. The battery 100a may be used for power supply of the vehicle 1000a, for example, the battery 100a may be used as an operating power source of the vehicle 1000 a. The vehicle 1000a may also include a controller 200a and a motor 300a, the controller 200a being configured to control the battery 100a to power the motor 300a, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000 a.

In some embodiments of the application, battery 100a may not only serve as an operating power source for vehicle 1000a, but also as a driving power source for vehicle 1000a, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000 a.

In some embodiments, battery 100a may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The battery 100a according to the embodiment of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

In the embodiment of the present application, the battery cell 1 may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use. Each battery cell 1 may also be a primary battery.

The battery cell 1 includes, but is not limited to, a lithium 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, and the like. The battery cell 1 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

In some embodiments, the battery 100a may be a battery module, and when there are a plurality of battery cells 1, the plurality of battery cells 1 are arranged and fixed to form one battery module.

In some embodiments, referring to fig. 2, the battery 100a may be a battery pack, which includes a case 10a and a battery cell 1, and the battery cell 1 or the battery module is accommodated in the case 10 a.

In some embodiments, the tank 10a may be part of the chassis structure of the vehicle 1000 a. For example, a portion of the tank 10a may become at least a portion of the floor of the vehicle 1000a, or a portion of the tank 10a may become at least a portion of the cross member and the side member of the vehicle 1000 a.

Referring to fig. 2, a battery 100a includes a case 10a and a battery cell 1, and the battery cell 1 is accommodated in the case 10 a. The case 10a is used to provide a receiving space for the battery cell 1, and the case 10a may have various structures. In some embodiments, the case 10a may include a first portion 11a and a second portion 12a, the first portion 11a and the second portion 12a being mutually covered, the first portion 11a and the second portion 12a together defining an accommodating space for accommodating the battery cell 1. The second portion 12a may be a hollow structure with one end opened, the first portion 11a may be a plate-shaped structure, and the first portion 11a covers the opening side of the second portion 12a, so that the first portion 11a and the second portion 12a together define an accommodating space; the first portion 11a and the second portion 12a may be hollow structures each having an opening at one side, and the opening side of the first portion 11a is covered with the opening side of the second portion 12 a. Of course, the case 10a formed by the first portion 11a and the second portion 12a may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100a, the plurality of battery cells 1 may be connected in series, parallel or a series-parallel connection between the plurality of battery cells 1, and the series-parallel connection refers to that the plurality of battery cells 1 are connected in series or in parallel. The plurality of battery cells 1 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 1 is accommodated in the box 10 a; of course, the battery 100a may be a battery module formed by connecting a plurality of battery cells 1 in series or parallel or series-parallel connection, and a plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10 a. The battery 100a may further include other structures, for example, the battery 100a may further include a bus member for making electrical connection between the plurality of battery cells 1.

Referring to fig. 3 and 4, the battery cell 1 refers to the smallest unit constituting the battery. In the present embodiment, a cylindrical battery cell 1 is described as an example. As shown in fig. 3 and 4, the battery cell 1 includes a case 100 and an electrode assembly and other functional components.

In some embodiments, the housing 100 is used to encapsulate the electrode assembly and electrolyte, etc. The housing 100 may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), an aluminum-plastic film, or the like.

The housing 100 may include an end cap 120 and a housing body 110. The end cap 120 refers to a member that is covered at the opening of the case 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 may be adapted to the shape of the housing body 110 to fit the housing body 110. Optionally, the end cover 120 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 120 is not easy to deform when being extruded and collided, so that the battery cell 1 can have higher structural strength, and the safety performance can be improved. The cap 120 may be provided with functional parts such as the electrode terminal 200. The electrode terminal 200 may be used to be electrically connected with the electrode assembly for outputting or inputting electric power of the battery cell 1. In some embodiments, the end cap 120 may further be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value. The end cap 120 may also be made of a variety of materials, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may also be provided on the inside of the end cap 120, which may serve to isolate the electrical connection members within the housing body 110 from the end cap 120 to reduce the risk of short circuits. By way of example, the insulating member may be plastic, rubber, or the like.

The case body 110 is an assembly for cooperating with the end cap 120 to form an internal environment of the battery cell 1, wherein the formed internal environment may be used to accommodate an electrode assembly, an electrolyte, and other components. The case body 110 and the end cap 120 may be separate members, and an opening may be provided in the case body 110, and the interior of the battery cell 1 may be formed by covering the opening with the end cap 120 at the opening. The end cap 120 and the housing body 110 may be integrated, and specifically, the end cap 120 and the housing body 110 may form a common connection surface before other components are put into the housing, and when the interior of the housing body 110 needs to be sealed, the end cap 120 is then covered on the housing body 110. The housing main body 110 may be of various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the case body 110 may be determined according to the specific shape and size of the electrode assembly. The material of the housing body 110 may be various, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The electrode assembly is a component in which electrochemical reactions occur in the battery cell 1. The case body 110 may contain one or more electrode assemblies therein.

In some embodiments, the electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

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.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

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 conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (e.g., liFePO ₄ (also abbreviated as LFP)), composite material of lithium iron phosphate and carbon, and manganese lithium phosphate (such as LiMnPO) ₄ ) At least one of a composite material of lithium manganese phosphate and carbon, and a composite material of lithium manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (e.g., liCoO) ₂ ) Lithium nickel oxide (e.g. LiNiO) ₂ ) Lithium manganese oxide (e.g. LiMnO ₂ 、LiMn2O ₄ ) Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., li)Ni _1/3 Co _1/3 Mn _1/3 O ₂ (also referred to as NCM) ₃₃₃ ）、LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (also referred to as NCM) ₅₂₃ ）、LiNi _0.5 Co _0.25 Mn _0.25 O ₂ (also referred to as NCM) ₂₁₁ ）、LiNi _0.6 Co _0.2 Mn _0.2 O ₂ (also referred to as NCM) ₆₂₂ ）、LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (also referred to as NCM) ₈₁₁ ) Lithium nickel cobalt aluminum oxide (e.g. LiNi _0.85 Co _0.15 Al _0.05 O ₂ ) And at least one of its modified compounds and the like.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

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

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.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative active material for a battery cell, which is well known in the art, may be used. As an example, the anode 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, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

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.

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

In some embodiments, the separator is a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

Wherein the liquid electrolyte comprises an electrolyte salt and a solvent.

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 difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.

In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methylethyl 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, sulfolane, dimethyl sulfone, methyl sulfone, and diethyl sulfone. The solvent may also be selected from ether solvents. The ether solvent may 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.

The gel electrolyte comprises a skeleton network taking a polymer as an electrolyte and is matched with ionic liquid-lithium salt.

Wherein the solid electrolyte comprises a polymer solid electrolyte, an inorganic solid electrolyte and a composite solid electrolyte.

As examples, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single ion polymer, polyion liquid-lithium salt, cellulose, or the like.

As an example, the inorganic solid electrolyte may be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium super ion conductor (lithium germanium phosphorus sulfide, silver sulfur germanium mine), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

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

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery 100a, the positive and negative electrode active materials react with the electrolyte, and the tab is connected to the electrode terminal to form a current loop.

According to one or more embodiments of the present application, referring to fig. 3, a battery 100a may include a case 2, a battery cell 1, and a plurality of air pressure sensors 3. The battery cell 1 is disposed inside the case 2. The plurality of air pressure sensors 3 may be used to detect air pressures at different positions inside the housing 2, respectively. Alternatively, a plurality of air pressure sensors 3 are provided at intervals inside the housing 2. At least two air pressure sensors 3 are located outside different sides of the battery cell 1.

The gas pressure sensor 3 may be a sensor that can be used to measure the gas pressure, and that can output a gas pressure signal that characterizes the gas pressure. In other words, the air pressure sensor 3 can output an air pressure signal matching the air pressure, and when the air pressure is different, the air pressure sensor 3 can output a different air pressure signal. The air pressure signal may be acquired by the battery cell 1, the battery module, or a processor (processing circuit) of the vehicle. In some embodiments, the housing 2 may be a case 10a.

In the above manner, the air pressure sensor 3 can be used to monitor the air pressure outside the battery cell 1 to give a thermal runaway alarm. In addition, the air pressure inside the battery cell 1 may vary with the operation of the battery, so that it may be difficult and not accurate to monitor the air pressure inside the battery cell 1 by the air pressure sensor 3 to perform a thermal runaway alarm. The air pressure outside the battery cell 1 is more stable than the air pressure inside the battery cell 1, so that the difficulty of monitoring the air pressure outside the battery cell 1 for thermal runaway alarm is small, and the accuracy is relatively high. In addition, the gas leakage is likely to occur at different positions on the battery cell, the number of the air pressure sensors 3 is multiple, the air pressures at different positions outside the battery cell 1 can be monitored more comprehensively, and then the thermal runaway alarm can be accurately carried out.

According to some embodiments of the present application, optionally, the plurality of air pressure sensors 3 constitute a three-dimensional air pressure detection lattice inside the housing 2. The plurality of air pressure sensors 3 are not simultaneously located on the same plane. The air pressure detection lattice is also understood to be a collection of a plurality of air pressure sensors 3 or an air pressure sensor 3 group. Through the mode, the air pressure detection dot matrix can monitor the air pressure of each position outside the battery monomer 1 (in the shell 2) more comprehensively, and then can timely and accurately detect the air pressure when the air pressure of any position is abnormal, so that the thermal runaway alarm can be conveniently carried out.

According to some embodiments of the application, optionally, referring to fig. 3, the battery cell 1 comprises a wall portion 121 and an explosion-proof valve 122. The explosion-proof valve 122 is provided in the wall portion 121. Wherein the explosion proof valve 122 is a pressure relief device commonly used in systems containing combustible media. When the pressure in the system exceeds a threshold, the explosion proof valve 122 ruptures to relieve pressure, reducing the likelihood of or the power of the system explosion. The wall portion 121 may refer to the end cap 120 of the battery cell 1 or the mounting region of the case 2. That is, the explosion-proof valve 122 may be provided at the end cap 120 of the battery cell 1 or the case 2.

According to some embodiments of the application, optionally, referring to fig. 3, the housing 2 comprises a first housing wall 21, a lateral housing wall 22 and a second housing wall 23. The lateral housing wall 22 is connected between the first housing wall 21 and the second housing wall 23. The first housing wall 21 and the wall portion 121 are disposed opposite to each other. The plurality of air pressure sensors 3 includes at least one first air pressure sensor 3a. At least one first air pressure sensor 3a is provided in the first housing wall 21 or the wall portion 121. Typically, when the battery is about to thermally run away, the change in air pressure near the explosion-proof valve 122 will lead other areas. Therefore, in the above manner, at least one first air pressure sensor 3a may be disposed between the first case wall 21 and the wall portion 121, so that when the explosion-proof valve 122 is ruptured to release the gas, the air pressure change in the area between the first case wall 21 of the case 2 and the wall portion 121 of the battery cell 1 can be sensitively recognized, thereby facilitating the thermal runaway alarm.

According to some embodiments of the application, optionally referring to fig. 4 or 5, at least one first air pressure sensor 3a is provided at the first housing wall 21. The orthographic projection of each first air pressure sensor 3a on the plane of the wall portion 121 falls into the explosion-proof valve 122. In the above manner, the at least one first air pressure sensor 3a may face the explosion-proof valve 122, and when the explosion-proof valve 122 cracks to release the gas, the at least one first air pressure sensor 3a may more sensitively detect the air pressure change.

According to some embodiments of the application, optionally, referring to fig. 4, the number of battery cells 1 is a plurality. The plurality of battery cells 1 are arranged in a row. The number of the first air pressure sensors 3a is plural. The plurality of first air pressure sensors 3a are arranged at intervals. The orthographic projection of each first air pressure sensor 3a on the plane of the wall portion 121 falls into an explosion-proof valve 122. In this way, the plurality of first air pressure sensors 3a may be disposed opposite to the explosion-proof valves 122 of the plurality of battery cells 1, respectively, so that when any one of the explosion-proof valves 122 of the plurality of battery cells 1 breaks open to release gas, the corresponding first air pressure sensor 3a can sensitively monitor the air pressure change, and further perform thermal runaway alarm.

According to some embodiments of the application, optionally, referring to fig. 5, the number of battery cells 1 is a plurality. The plurality of battery cells 1 are arranged in a row. The orthographic projection of each first air pressure sensor 3a on the plane of the wall portion 121 falls between the explosion-proof valves 122 of the adjacent two battery cells 1. In this case, assuming that the number of the battery cells 1 is N, the number of the first air pressure sensors 3a may be between N/2 and N-1. The number of first air pressure sensors 3a can be reduced to some extent as compared with the one-to-one correspondence of the first air pressure sensors 3a and the battery cells 1 (explosion-proof valves 122). Through the above manner, each first air pressure sensor 3a is arranged between the explosion-proof valves 122 of two adjacent battery monomers 1, so that the air pressure change near the explosion-proof valves 122 of two battery monomers 1 can be effectively monitored, the number of the first sensors can be reduced to a certain extent, and the generation cost of the battery is further reduced.

According to some embodiments of the application, optionally, at least one first air pressure sensor 3a is provided in an area of the first housing wall 21 opposite to the wall portion 121. In this way, the first air pressure sensor 3a can monitor the air pressure change in the region between the first case wall 21 of the case 2 and the wall portion 121 of the battery cell 1 relatively sensitively and accurately, and thus can give a thermal runaway alarm sensitively.

According to some embodiments of the application, optionally, referring to fig. 6, the plurality of air pressure sensors 3 comprises at least one second air pressure sensor 3b. At least one second air pressure sensor 3b is arranged at the junction of the first housing wall 21 and the lateral housing wall 22. In this way, the second air pressure sensor 3b can further monitor the air pressure change at the junction of the first casing wall 21 and the lateral casing wall 22, and further can improve the accuracy of the thermal runaway alarm to a certain extent.

According to some embodiments of the application, the junction of the first shell wall 21 and the lateral shell wall 22 optionally has a plurality of corner locations. Each of the second air pressure sensors 3b is disposed at a corner position. In this way, the plurality of second air pressure sensors 3b may be disposed at a plurality of corner positions between the first housing wall 21 and the lateral housing wall 22, so as to monitor the air pressure at the plurality of corner positions comprehensively, and improve the accuracy of the thermal runaway alarm.

According to some embodiments of the application, optionally, referring to fig. 7, the plurality of air pressure sensors 3 comprises at least one third air pressure sensor 3c. At least one third air pressure sensor is disposed in the lateral housing wall 22. In this way, the third air pressure sensor 3c can further monitor the air pressure change between the lateral casing wall 22 and the battery cell 1, and thus can improve the accuracy of the thermal runaway alarm to some extent.

According to some embodiments of the application, optionally, the number of third air pressure sensors 3c is smaller than the number of first air pressure sensors 3 a. Through the above manner, more first air pressure sensors 3a are arranged in the area (namely, between the wall part 121 and the first shell wall 21) which is more likely to generate air pressure change firstly during thermal runaway, and fewer third air pressure sensors 3c are arranged in the area with smaller air pressure change probability firstly during thermal runaway, namely, the air pressure change between the shell 2 and the battery cell 1 can be sensitively and accurately monitored, the number of the air pressure sensors 3 can be reduced to a certain extent, and the generation cost of the battery is further reduced.

According to some embodiments of the present application, the number of third air pressure sensors 3c is optionally plural and divided into plural groups. Each group of third air pressure sensors 3c is disposed at a lateral case wall 22 at intervals around the circumferential direction of the battery cell 1. The plurality of sets of third air pressure sensors 3c are arranged at intervals in the direction from the first casing wall 21 to the second casing wall 23. In the adjacent two sets of third air pressure sensors 3c. The number of the set of third air pressure sensors 3c near the first housing wall 21 is larger than the number of the set of third air pressure sensors 3c near the second housing wall 23. In this way, the arrangement density of the third air pressure sensors 3c gradually decreases in the direction from the first casing wall 21 to the second casing wall 23, and the number of the third air pressure sensors 3c on the side close to the first casing wall 21 is large, so that the air pressure change in this area can be monitored relatively sensitively and comprehensively, and the number of the third air pressure sensors 3c on the side close to the second casing wall 23 is small, so that the battery generation cost can be reduced to some extent without significantly reducing the accuracy of the thermal runaway alarm.

Optionally, according to some embodiments of the application, the ratio of the number of third air pressure sensors 3c to the area of the first housing wall 21 is smaller than the ratio of the number of first air pressure sensors 3a to the area of the lateral housing wall 22. In this way, the density of the first air pressure sensor 3a provided on the first housing wall 21 is greater than the density of the second air pressure sensor 3b provided on the lateral housing wall 22, so that the air pressure change in the vicinity of the first housing wall 21 can be detected relatively sensitively, and the air pressure change in the vicinity of the lateral housing wall 22 can also be detected relatively accurately. In addition, the use of the third air pressure sensor 3c can be reduced to some extent, thereby reducing the production cost of the battery.

Optionally, according to some embodiments of the application, referring to fig. 7, the lateral shell wall 22 comprises two first side walls 24 and two second side walls 25. The two first side walls 24 are disposed opposite. The two second side walls 25 are disposed opposite to each other and connected to the two first side walls 24, respectively. The area of the first sidewall 24 is larger than the area of the second sidewall 25. Optionally, at least part of the third air pressure sensor 3c is arranged in an array at least one of the two first side walls 24. Optionally, at least another portion of the third air pressure sensors 3c are disposed in an array at least one of the two second side walls 25. In the above manner, part of the third air pressure sensor 3c may be used to monitor the air pressure of the area between the first side wall 24 and the battery cell 1, and the other part of the third air pressure sensor 3c may be used to monitor the air pressure of the area between the second side wall 25 and the battery cell 1, thereby being able to further monitor the air pressure variation of the area between the lateral case wall 22 and the battery cell 1, and further improving the accuracy of the thermal runaway alarm.

According to some embodiments of the application, optionally, referring to fig. 8, the plurality of air pressure sensors 3 comprises at least one fourth air pressure sensor 3d. At least one fourth air pressure sensor 3d is provided to the second housing wall 23. The number of fourth air pressure sensors 3d is smaller than the number of third air pressure sensors 3 c. In the above manner, the fourth air pressure sensor 3d can further monitor the air pressure change of the region between the second case wall 23 and the battery cell 1 to improve the accuracy of the thermal runaway alarm. In addition, the number of the fourth sensors is small, so that the generation cost of the battery can be reduced to a certain extent.

According to some embodiments of the present application, the battery cell 1 optionally includes a positive electrode post 201 and a negative electrode post 202 (i.e., the electrode terminal 200 described above). The battery includes a circuit board. The circuit board is provided to the housing 2. The circuit board is electrically connected to the positive electrode post 201 and the negative electrode post 202. The circuit board is provided with a voltage conversion module. The battery is electrically connected with the plurality of air pressure sensors 3 through the voltage conversion module to supply power to the plurality of air pressure sensors 3. In this way, the battery cell 1 is used to supply power to the air pressure sensor 3, so that the integration level of the battery can be improved.

According to some embodiments of the application, the battery optionally comprises a power supply independent of the battery cell 1. The power supply is provided in the housing 2. The power supply is electrically connected to the plurality of air pressure sensors 3 to supply power to the plurality of air pressure sensors 3. In this way, the power supply source can stably supply power to the air pressure sensor 3 independently of the other battery cells 1.

According to some embodiments of the application, the battery cell 1 optionally comprises a processor. The processor is provided in the housing 2. The processor is electrically connected to a plurality of air pressure sensors 3. The processor may be configured to obtain a 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. In addition, the processor is used for judging whether the battery has abnormal air pressure according to the air pressures measured by the air pressure sensors 3, and if so, the processor carries out thermal runaway alarm.

In some embodiments, the processor of the battery unit 1 is configured to determine whether the air pressure measured by each air pressure sensor 3 is greater than or equal to a first preset threshold value, and if the air pressure measured by at least one air pressure sensor 3 is greater than or equal to the first preset threshold value, determine that the air pressure of the battery is abnormal.

Further, if the air pressure measured by each air pressure sensor 3 is smaller 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; if the air pressure measured by the at least two air pressure sensors 3 is greater than or equal to a second preset threshold value, the air pressure abnormality of the battery is judged. Wherein the second preset threshold is smaller than the first preset threshold.

Alternatively, if the air pressure measured by more than two thirds of the air pressure sensors 3 of the plurality of air pressure sensors 3 is greater than or equal to the second preset threshold value, it is determined that the air pressure abnormality occurs in the battery.

In a second aspect, another embodiment of the present application provides an electrical device comprising the above-described battery. The power utilization device can be electronic equipment such as an automobile, a mobile phone, a headset and the like. Optionally, the method comprises the step of. The electricity utilization device comprises a processor, and the processor is electrically connected with the plurality of air pressure sensors 3; the processor is used for acquiring the measurement signal of each air pressure sensor 3 and obtaining the air pressure measured by each air pressure sensor 3 according to the measurement signal; the processor is used for judging whether the air pressure of the battery is abnormal according to the air pressures measured by the air pressure sensors 3, and if so, the processor carries out thermal runaway alarm.

Specifically, in some embodiments, the processor of the power consumption device is configured to determine whether the air pressure measured by each air pressure sensor 3 is greater than or equal to a first preset threshold, and if the air pressure measured by at least one air pressure sensor 3 is greater than or equal to the first preset threshold, determine that the air pressure of the battery is abnormal.

In summary, according to some embodiments of the application, the power consuming device may include a battery. Wherein the battery may include a housing 2, a battery cell 1, and a plurality of air pressure sensors 3; the battery cell 1 is arranged in the shell 2; the plurality of air pressure sensors 3 are arranged in the shell 2 at intervals, at least two air pressure sensors 3 are positioned outside different sides of the battery cell 1, and the plurality of air pressure sensors 3 are respectively used for detecting air pressures at different positions in the shell 2. The plurality of air pressure sensors 3 form a three-dimensional air pressure detection lattice inside the shell 2, and the plurality of air pressure sensors 3 are not located on the same plane at the same time. The battery cell 1 may include a wall portion 121 and an explosion-proof valve 122, the explosion-proof valve 122 being provided to the wall portion 121; the housing 2 comprises a first housing wall 21, a lateral housing wall 22 and a second housing wall 23, the lateral housing wall 22 being connected between the first housing wall 21 and the second housing wall 23; the first housing wall 21 and the wall portion 121 are disposed opposite to each other. The plurality of air pressure sensors 3 includes at least one first air pressure sensor 3a; at least one first air pressure sensor 3a is provided in the first housing wall 21 or the wall portion 121. At least one first air pressure sensor 3a is provided in a region where the first housing wall 21 is provided opposite to the wall portion 121. Further, the number of the battery cells 1 is plural, and the plural battery cells 1 are arranged in a row. The number of the first air pressure sensors 3a is plural, and the plural first air pressure sensors 3a are arranged at intervals. The orthographic projection of each first air pressure sensor 3a on the plane of the wall portion 121 may fall into one explosion-proof valve 122 or may fall between the explosion-proof valves 122 of two adjacent battery cells 1.

The plurality of air pressure sensors 3 may further include at least one second air pressure sensor 3b, where the at least one second air pressure sensor 3b is disposed at a junction of the first housing wall 21 and the lateral housing wall 22. The junction of the first housing wall 21 and the lateral housing wall 22 has a plurality of corner positions, and each of the second air pressure sensors 3b may be disposed at one corner position. In addition, the plurality of air pressure sensors 3 may further include at least one third air pressure sensor 3c, and the at least one third air pressure sensor is disposed on the lateral housing wall 22. The number of third air pressure sensors 3c may be smaller than the number of first air pressure sensors 3 a. Further, the number of the third air pressure sensors 3c is plural and divided into plural groups, and each group of the third air pressure sensors 3c is disposed at a lateral casing wall 22 at intervals around the circumference of the battery cell 1; the plurality of 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; of the adjacent two sets of third air pressure sensors 3c, the number of sets of third air pressure sensors 3c near the first housing wall 21 is larger than the number of sets of third air pressure sensors 3c near the second housing wall 23. Further, 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. Further, the lateral shell wall 22 may include two first side walls 24 and two second side walls 25, where the two first side walls 24 are disposed opposite to each other, and the two second side walls 25 are disposed opposite to each other and connected to the two first side walls 24, respectively; the area of the first sidewall 24 is larger than the area of the second sidewall 25; 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; and/or at least another portion of the third air pressure sensors 3c are disposed in an array at least one of the two second side walls 25. In addition, the plurality of air pressure sensors 3 may further include at least one fourth air pressure sensor 3d, and the at least one fourth air pressure sensor 3d is disposed on the second housing wall 23; the number of fourth air pressure sensors 3d is smaller than the number of third air pressure sensors 3 c.

The battery unit 1 may include a positive electrode column 201 and a negative electrode column 202, the battery includes a circuit board, the circuit board is disposed on the housing 2, the circuit board is electrically connected with the positive electrode column 201 and the negative electrode column 202, and the circuit board is provided with a voltage conversion module; the battery is electrically connected with the plurality of air pressure sensors 3 through the voltage conversion module to supply power to the plurality of air pressure sensors 3. In other embodiments, the battery includes a power supply independent of the battery cell 1, the power supply being disposed in the housing 2, the power supply being electrically connected to the plurality of air pressure sensors 3 to power the plurality of air pressure sensors 3.

Wherein at least one of the battery cell 1 and the power utilization device may further include a processor electrically connected to the plurality of air pressure sensors 3; the processor is used for acquiring the measurement signal of each air pressure sensor 3 and obtaining the air pressure measured by each air pressure sensor 3 according to the measurement signal; the processor is used for judging whether the air pressure of the battery is abnormal according to the air pressures measured by the air pressure sensors 3, and if so, the processor carries out thermal runaway alarm.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising:

a housing;

the battery unit is arranged in the shell;

the air pressure sensors are arranged in the shell at intervals, at least two air pressure sensors are positioned outside different sides of the battery cell, and the air pressure sensors are respectively used for detecting air pressure at different positions in the shell;

the air pressure sensors form a three-dimensional air pressure detection lattice in the shell, and are not located on the same plane at the same time.

2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the battery unit comprises a wall part and an explosion-proof valve, and the explosion-proof valve is arranged on the wall part; the housing comprises a first housing wall, a lateral housing wall and a second housing wall, the lateral housing wall being connected between the first housing wall and the second housing wall; the first shell wall and the wall part are oppositely arranged; the plurality of air pressure sensors includes 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 part.

3. The battery of claim 2, wherein the battery is configured to provide the battery with a plurality of cells,

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 of the wall part falls into the explosion-proof valve.

4. The battery of claim 3, wherein the battery is provided with a battery cell,

the number of the battery cells is multiple, and the multiple battery cells are arranged in a arrayed manner; the number of the first air pressure sensors is multiple, and the first air pressure sensors are arranged at intervals; the orthographic projection of each first air pressure sensor on the plane of the wall part falls into one explosion-proof valve.

5. The battery of claim 2, wherein the battery is configured to provide the battery with a plurality of cells,

the number of the battery cells is multiple, and the multiple battery cells are arranged in a arrayed manner; the orthographic projection of each first air pressure sensor on the plane of the wall part falls between the explosion-proof valves of two adjacent battery cells.

6. The battery of claim 2, wherein the battery is configured to provide the battery with a plurality of cells,

the at least one first air pressure sensor is arranged in an area where the first shell wall and the wall part are arranged opposite to each other.

7. The battery of claim 3, wherein the battery is provided with a battery cell,

the plurality of air pressure sensors comprises at least one second air pressure sensor which is arranged at the joint of the first shell wall and the lateral shell wall.

8. The battery of claim 7, wherein the battery is configured to provide the battery with a battery cell,

The connection part of the first shell wall and the lateral shell wall is provided with a plurality of corner positions, and each second air pressure sensor is arranged at one corner position.

9. The battery of claim 2, wherein the battery is configured to provide the battery with a plurality of cells,

the plurality of air pressure sensors includes at least one third air pressure sensor disposed in the lateral housing wall.

10. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

the number of third air pressure sensors is smaller than the number of first air pressure sensors.

11. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

the number of the third air pressure sensors is multiple, the third air pressure sensors are divided into multiple groups, and each group of the third air pressure sensors is arranged on the lateral shell wall at intervals around the circumference of the battery cell; the third air pressure sensors are arranged at intervals along the direction from the first shell wall to the second shell wall; in the adjacent two sets of the third air pressure sensors, the number of the third air pressure sensors close to the first shell wall is larger than the number of the third air pressure sensors close to the second shell wall.

12. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

The ratio of the number of first air pressure sensors to the area of the first housing wall is greater than the ratio of the number of third air pressure sensors to the area of the lateral housing wall.

13. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

the lateral shell wall comprises two first side walls and two second side walls, the two first side walls are oppositely arranged, and the two second side walls are oppositely arranged and are respectively connected with the two first side walls; the area of the first side wall is larger than that of the second side wall;

at least a portion 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 disposed in an array at least one of the two second side walls.

14. The battery of claim 9, wherein the battery is configured to provide the battery with a plurality of cells,

the plurality of air pressure sensors comprise at least one fourth air pressure sensor, and the at least one fourth air pressure sensor is arranged on the second shell wall; the number of fourth air pressure sensors is less than the number of third air pressure sensors.

15. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The battery unit comprises a positive pole and a negative pole, the battery comprises a circuit board, the circuit board is arranged on the shell, the circuit board is electrically connected with the positive pole and the negative pole, and the circuit board is provided with a voltage conversion module; the battery is electrically connected with the plurality of air pressure sensors through the voltage conversion module so as to supply power for the plurality of air pressure sensors.

16. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the battery comprises a power supply independent of the battery unit, the power supply is arranged in the shell, and the power supply is electrically connected with the plurality of air pressure sensors so as to supply power for the plurality of air pressure sensors.

17. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the battery unit comprises a processor, the processor is arranged on the shell, and the processor is electrically connected with the plurality of air pressure sensors; the processor is used for acquiring a measurement signal of each air pressure sensor and obtaining the air pressure measured by each air pressure sensor according to the measurement signal; and the processor is used for judging whether the battery has abnormal air pressure according to the air pressures measured by the air pressure sensors, and if so, giving out a thermal runaway alarm.

18. An electrical device comprising a battery as claimed in any one of claims 1 to 17.

19. An electrical device according to claim 18, wherein,

the power utilization device comprises a processor, and the processor is electrically connected with the plurality of air pressure sensors; the processor is used for acquiring a measurement signal of each air pressure sensor and obtaining the air pressure measured by each air pressure sensor according to the measurement signal; and the processor is used for judging whether the battery has abnormal air pressure according to the air pressures measured by the air pressure sensors, and if so, giving out a thermal runaway alarm.