Battery cells, batteries and electrical devices

Abstract

The present application relates to a battery cell, a battery and an electrical device. The battery cell includes a battery cell and a circuit assembly, the circuit assembly is conductively connected to the battery cell to form an energy storage circuit; the circuit assembly includes an energy storage element and a circuit switch, the circuit switch is connected in series with the energy storage element; when the air pressure inside the battery cell is less than a first air pressure threshold, the circuit switch is in a disconnected state to put the energy storage circuit in an open circuit state; when the air pressure inside the battery cell is greater than or equal to the first air pressure threshold, the circuit switch is in a closed state to put the energy storage circuit in a conducting state; the energy storage element is configured to store electrical energy when the energy storage circuit is conducting; the circuit switch includes an airbag, the airbag is filled with gas and the air pressure inside the airbag is less than the first air pressure threshold, the airbag is configured to deform in response to changes in air pressure inside the battery cell to turn on or off the energy storage circuit. The battery cell of the present application has an energy storage circuit that can reduce the charge of the battery cell when the battery cell produces gas rapidly.

Description

Technical Field

[0001] The present application relates to the field of battery safety technology, and in particular to battery cells, batteries and electrical devices. Background Art

[0002] As an energy storage device, the safety performance of batteries is extremely important. In related technologies, when a battery experiences thermal runaway, there is often violent gas production during safety testing, abuse scenarios such as overcharging and over-discharging, and use throughout the life cycle. When a battery produces gas rapidly, the internal pressure of the battery increases, which can easily cause safety issues such as fire and explosion of the battery. Summary of the invention

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can reduce the charge of the battery cell when the battery produces gas rapidly, thereby reducing the risk of fire and explosion of the battery.

[0004] In a first aspect, the present application provides a battery cell, comprising: a battery cell and a circuit assembly, wherein the circuit assembly is conductively connected to the battery cell to form an energy storage circuit; the circuit assembly comprises an energy storage element and a circuit switch, wherein the circuit switch is connected in series with the energy storage element; when the air pressure inside the battery cell is less than a first air pressure threshold, the circuit switch is in a disconnected state to put the energy storage circuit in an open circuit state; when the air pressure inside the battery cell is greater than or equal to the first air pressure threshold, the circuit switch is in a closed state to put the energy storage circuit in a conducting state; the energy storage element is configured to store electrical energy when the energy storage circuit is conducted; wherein the circuit switch comprises an airbag, the airbag is filled with gas and the air pressure inside the airbag is less than the first air pressure threshold, and the airbag is configured to deform in response to changes in air pressure inside the battery cell to conduct or cut off the energy storage circuit.

[0005] In the technical solution of the embodiment of the present application, by providing a circuit component that is conductively connected to the battery cell, and providing a circuit switch that can respond to the air pressure change inside the battery cell, the circuit component can be turned on when the air pressure inside the battery cell rises to reach the first air pressure threshold, so that the circuit component and the battery cell form a conductive energy storage circuit, which can enable the battery cell to discharge and realize the storage and consumption of the remaining power of the battery cell. In this way, the charge of the battery cell can be reduced when the battery cell produces gas rapidly, thereby reducing the risk of fire and explosion of the battery cell, and improving the safety performance of the battery cell. The circuit switch can sense the air pressure change inside the battery cell through the airbag to achieve the control of the switching state of the circuit switch in response to the air pressure change inside the battery cell, which can simplify the structure of the circuit switch, improve the reliability of the circuit switch, and reduce costs.

[0006] In some embodiments, the circuit switch further includes a conductive member and a switch member; one end of the conductive member is located inside the airbag and the other end is located outside the airbag, and the conductive member is used to connect the circuit switch in series in the circuit assembly; the switch member is arranged inside the airbag, and the compression deformation of the airbag can drive the switch member to move close to the conductive member; when the air pressure inside the battery cell is greater than or equal to the first air pressure threshold, the switch member moves to conductive contact with the conductive member, so that the circuit switch is closed; when the air pressure inside the battery cell is less than the first air pressure threshold, the switch member separates from the conductive member, so that the circuit switch is disconnected. In this way, an airbag switch structure is formed, the airbag can deform to drive the switch member to move, so that the switch member can act under the action of pressure to move to connect or separate with the conductive member, so as to control the switch state of the circuit switch, which can simplify the structure of the circuit switch, improve the reliability of the circuit switch, and reduce the cost.

[0007] In some embodiments, the circuit assembly further comprises a wire, a first electrical connector and a second electrical connector, wherein the first electrical connector, the energy storage element, the circuit switch and the second electrical connector are connected in series via the wire; and the first electrical connector and the second electrical connector are conductively connected to the battery cell. In this way, the circuit assembly has a simple and compact structure, which can save space and help reduce costs.

[0008] In some embodiments, the battery cell further includes a pressure relief mechanism, which is used to release the pressure inside the battery cell when the air pressure inside the battery cell reaches a second air pressure threshold; the second air pressure threshold is greater than or equal to the first air pressure threshold. In this way, the trigger air pressure value for turning on the energy storage circuit can be made less than or equal to the opening pressure value for opening the pressure relief mechanism. During the process of increasing air pressure inside the battery cell, the energy storage circuit can be turned on before the pressure relief mechanism is opened, which can improve the effectiveness of the energy storage circuit, enable the energy storage circuit to perform the power storage function, and realize the storage and consumption of the battery cell power, thereby reducing the charge of the battery cell, reducing the risk of fire and explosion of the battery cell, and improving safety performance.

[0009] In some embodiments, the battery cell further includes a shell and an end cap, the end cap is covered at the opening of the shell, the shell and the end cap enclose a containing space, and the battery cell is contained in the containing space; the circuit assembly is arranged in the containing space and is located between the end cap and the battery cell. In this way, a larger installation space can be provided for the circuit assembly, and a larger energy storage element can be used, so that the storage capacity is larger, more power of the battery cell can be stored and consumed, and the effect of reducing the charge of the battery cell is better.

[0010] In some embodiments, the battery cell further comprises a first insulating member, which is stacked on the inner side of the end cap; the circuit assembly is disposed on the first insulating member. In this way, a mounting base can be provided for the circuit assembly, which facilitates the assembly of the circuit assembly in the battery cell and improves assembly efficiency.

[0011] In some embodiments, the battery cell includes a battery cell body and a first pole tab and a second pole tab connected to the battery cell body; the battery cell also includes a first electrode, a second electrode, a first adapter and a second adapter, the first adapter is connected between the first electrode and the first pole tab, the second adapter is connected between the second electrode and the second pole tab, and the first electrode and the second electrode are used to output or input the electric energy of the battery cell; the circuit assembly is connected in series between the first adapter and the second adapter. In this way, a larger installation space can be provided for the circuit assembly, and a larger energy storage element can be used to increase the storage capacity, so that more electricity of the battery cell can be stored and consumed, and the effect of reducing the charge of the battery cell is better, and the installation structure of the circuit assembly is simple, which is conducive to reducing costs.

[0012] In some embodiments, the battery cell includes a battery cell body and a first pole tab and a second pole tab connected to the battery cell body; the circuit assembly is connected in series between the first pole tab and the second pole tab. In this way, a larger installation space can be provided for the circuit assembly, and a larger energy storage element can be used, so that the storage capacity is larger, more electricity of the battery cell can be stored and consumed, and the effect of reducing the charge of the battery cell is better, and the installation structure of the circuit assembly is simple, which is conducive to reducing costs.

[0013] In a second aspect, the present application provides a battery, the battery comprising a battery cell in any of the above embodiments.

[0014] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment or the battery cell in any of the above embodiments, and the battery and the battery cell are used to provide electrical energy.

[0015] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0017] FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application.

[0018] FIG. 2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application.

[0019] FIG. 3 is an exploded view of a battery cell provided in some embodiments of the present application.

[0020] FIG. 4 is a cross-sectional view of a battery cell provided in some embodiments of the present application.

[0021] FIG. 5 is a schematic diagram of the structure of a circuit assembly provided in some embodiments of the present application.

[0022] FIG6 is a schematic diagram of a structure in which a circuit switch provided in some embodiments of the present application is in an off state.

[0023] FIG. 7 is a schematic diagram of a structure in which a circuit switch provided in some embodiments of the present application is in a closed state.

[0024] FIG. 8 is a top view of an end cap provided in some embodiments of the present application.

[0025] FIG. 9 is a cross-sectional view of the AA section in FIG. 8 .

[0026] FIG. 10 is a bottom view of an end cap provided in some embodiments of the present application.

[0027] FIG. 11 is a schematic diagram showing a circuit component provided in some embodiments of the present application being disposed on a first insulating member.

[0028] FIG. 12 is a schematic diagram showing a circuit component provided in some embodiments of the present application connected in series between a first adapter and a second adapter.

[0029] FIG. 13 is a schematic diagram showing circuit components provided in some other embodiments of the present application connected in series between a first adapter and a second adapter.

[0030] FIG. 14 is a schematic diagram showing circuit components provided in some other embodiments of the present application connected in series between a first adapter and a second adapter.

[0031] FIG. 15 is a schematic diagram showing a circuit component provided in some embodiments of the present application that is connected in series between a first electrode tab and a second electrode tab.

[0032] The reference numerals in the specific implementation manner are as follows:

[0033] 1000, vehicle; 100, battery; 200, controller; 300, motor;

[0034] 10. Box body; 11. First part; 12. Second part;

[0035] 20. Battery cell; 21. Battery cell; 211. Battery cell body; 212. First pole ear; 213. Second pole ear; 22. Circuit assembly; 221. Energy storage element; 222. Circuit switch; 2221. Airbag; 2222. Conductor; 2223. Switch component; 223. Wire; 224. First electrical connector; 225. Second electrical connector; 23. Shell; 231. Opening; 24. End cover; 241. First electrode; 242. Second electrode; 25. First insulating member; 261. First adapter; 262. Second adapter; 27. Second insulating member; 28. Pressure relief mechanism. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the description of the embodiments of the present application, the terms "first" and "second" are used only for descriptive purposes to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, "plurality" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that an element is referred to as being "fixed on" or "disposed on" another element, and it may be directly on the other element or there may be a centered element. An element is considered to be "connected to" another element, and it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the embodiments of the present application are for illustrative purposes only and are not intended to be the only implementation method.

[0045] From the perspective of market development, the application of batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. As an energy storage device, the safety performance of batteries is extremely important.

[0046] In safety testing, abuse scenarios such as overcharging and over-discharging, and use throughout the life cycle, when the battery experiences thermal runaway, there is often violent gas production. When the battery produces gas rapidly, the internal pressure of the battery increases, which can easily cause safety problems such as fire and explosion of the battery.

[0047] In the related art, in order to improve battery safety, a current cut-off structure (CID) is set on the battery. The current cut-off structure can be destroyed when the internal pressure of the battery exceeds the reference pressure, disconnecting the electrical connection of the battery during use or charging, so as to cut off the main circuit of the battery before the battery thermal runaway occurs, automatically cut off the power, prevent the battery from continuing to be used or charged, and protect the battery safety. For example, a flip sheet and a current cut-off structure can be set on the top cover of the battery, and the flip sheet is fixed under the top cover through an insulating member, and the flip sheet is electrically connected to the top cover through the current cut-off structure. The flip sheet can flip over and destroy the current cut-off structure when the internal pressure of the battery exceeds the reference pressure, so that the flip sheet is disconnected from the electrical connection with the top cover.

[0048] However, there is residual power in the battery cells, and thermal runaway of the battery cells will release internal pressure, which can easily cause spontaneous combustion and explosion. Therefore, it is necessary to reduce the charge of the battery cells when the battery produces gas rapidly, thereby reducing the risk of fire and explosion of the battery.

[0049] Based on the above considerations, in order to reduce the charge of the battery cells when the battery produces gas rapidly, a power storage circuit structure can be introduced into the battery to store and consume the remaining power of the battery cells, thereby realizing the function of reducing the charge of the battery cells when the battery produces gas rapidly and reducing the risk of fire and explosion of the battery.

[0050] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is beneficial to reduce the charge of the battery cell when the battery produces gas rapidly, reduce the risk of fire and explosion of the battery, and improve safety.

[0051] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0052] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in some embodiments of the present application.

[0053] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

[0054] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0055] Please refer to FIG. 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0056] In the battery 100, the battery cell 20 refers to the smallest unit constituting the battery 100. There may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0057] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes, that is, the battery cell 20 is not limited to a square-shell battery, but may also be a cylindrical battery.

[0058] According to some embodiments of the present application, referring to FIGS. 3 to 5, FIG. 3 is an exploded view of a battery cell 20 provided in some embodiments of the present application, FIG. 4 is a cross-sectional view of a battery cell 20 provided in some embodiments of the present application, and FIG. 5 is a schematic diagram of the structure of a circuit assembly 22 provided in some embodiments of the present application. The present application provides a battery cell 20. The battery cell 20 includes a battery cell 21 and a circuit assembly 22. The circuit assembly 22 is conductively connected to the battery cell 21 to form an energy storage circuit. The circuit assembly 22 includes an energy storage element 221 and a circuit switch 222, and the circuit switch 222 is connected in series with the energy storage element 221. When the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, the circuit switch 222 is in a closed state so that the energy storage circuit is in a conducting state; the energy storage element 221 is configured to store electrical energy when the energy storage circuit is conducting. When the air pressure inside the battery cell 20 is less than the first air pressure threshold, the circuit switch 222 is in a disconnected state so that the energy storage circuit is in a circuit-breaking state.

[0059] The battery cell 21 is a component in the battery cell 20 where electrochemical reactions occur. The battery cell 20 may contain one or more battery cells 21. When the battery cell 20 is in use or charged, the battery cell 21 is connected in series in the power circuit or the charging circuit to form a power or charging loop. The charge of the battery cell 21 can be represented by the state of charge (SOC) of the battery cell 21. The state of charge refers to the ratio of the remaining power of the battery cell 21 to the capacity of the battery cell 21 when it is fully charged, and can be expressed as a percentage. For example, SOC=1 means that the battery cell 21 is in a fully charged state. The state of charge can indicate the ability of the battery cell 21 to continue working.

[0060] During safety testing, abuse scenarios such as overcharge and over-discharge, or full life cycle use, when the battery cell 21 experiences thermal runaway, the battery cell 21 may produce gas rapidly, causing the gas pressure inside the battery cell 20 to increase rapidly, which may cause the battery cell 20 to catch fire and explode. It is understandable that reducing the charge of the battery cell 21 can improve the thermal stability of the battery cell 21, reduce the risk of fire and explosion of the battery cell 20, and thus improve the safety of the battery cell 20.

[0061] The energy storage element 221 can store electrical energy, so that the circuit assembly 22 has an electrical storage function. For example, the energy storage element 221 may include but is not limited to a capacitor or an inductor. The circuit assembly 22 structure can be arranged on a component that can be electrically connected inside the battery cell 20. For example, the component that can be electrically connected inside the battery cell 20 may include but is not limited to the tab, electrode column or adapter of the battery cell 21. The battery cell 21 is conductively connected to the circuit assembly 22, and the circuit assembly 22 and the battery cell 21 can form an energy storage circuit with an electrical storage function.

[0062] The circuit switch 222 is used to control the on / off state of the circuit assembly 22, and further control the on / off state of the energy storage circuit. The circuit switch 222 is configured to be able to respond to changes in the air pressure inside the battery cell 20 to operate so that the circuit switch 222 is in a closed state or an open state. The triggering condition of the circuit switch 222 can be set to be that the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold.

[0063] The first air pressure threshold may be a pre-set air pressure comparison value for determining the air pressure inside the battery cell 20. For example, the first air pressure threshold may be in the range of 0.6MPa-1.2MPa. If the air pressure inside the battery cell 20 is less than the first air pressure threshold, it means that the air pressure inside the battery cell 20 is relatively small, the battery cell 21 is relatively stable, and the triggering condition of the circuit switch 222 is not reached. At this time, the circuit switch 222 is in the disconnected state, so that the circuit assembly 22 is in the open circuit state, and then the energy storage circuit is in the open circuit state, and the current does not pass through the circuit assembly 22. In this way, the influence of the energy storage circuit on the battery cell 21 can be reduced.

[0064] If the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, it means that the air pressure inside the battery cell 20 is too high and has reached the triggering condition of the circuit switch 222. The battery cell 21 may produce gas rapidly, posing a safety risk. At this time, the circuit switch 222 performs a closing action, so that the circuit switch 222 is in a closed state, the circuit assembly 22 is turned on, and the energy storage circuit is in a turned-on state, which can play the power storage function of the energy storage circuit. The current will pass through the circuit assembly 22, which can discharge the battery cell 21 and store the power consumed by the battery cell 21 or the excess power of the external charging current through the energy storage element 221. In this way, the charge of the battery cell 21 can be reduced, and the risk of fire and explosion of the battery cell 20 can be reduced.

[0065] In some embodiments, the circuit switch 222 may be a pressure switch, and the circuit switch 222 senses the change in the air pressure inside the battery cell 20. When the air pressure inside the battery cell 20 reaches the trigger condition of the circuit switch 222, the circuit switch 222 performs a closing action, so that the circuit switch 222 is in a closed state. In other embodiments, the circuit switch 222 may also be a controlled switch, and the circuit switch 222 performs a closing action after receiving a control signal, so that the circuit switch 222 is in a closed state.

[0066] The battery cell 20 of the embodiment of the present application is provided with a circuit assembly 22 that is conductively connected to the battery cell 21, and a circuit switch 222 that can respond to the air pressure change inside the battery cell 20. When the air pressure inside the battery cell 20 rises to a first air pressure threshold, the circuit assembly 22 can be turned on, so that the circuit assembly 22 and the battery cell 21 form a conductive energy storage circuit, so that the battery cell 21 can be discharged, and the remaining power of the battery cell 21 can be stored and consumed. In this way, the charge of the battery cell 21 can be reduced when the battery cell 21 produces gas rapidly, thereby reducing the risk of fire and explosion of the battery cell 20, and improving the safety performance of the battery cell 20.

[0067] 4 and 5 , the circuit switch 222 includes an airbag 2221 filled with gas, and the airbag 2221 is configured to deform in response to changes in air pressure inside the battery cell 20 to open or close the energy storage circuit. The air pressure inside the airbag 2221 is less than the first air pressure threshold.

[0068] There is a gas at a certain pressure in the airbag 2221, and the gas may include but is not limited to air or other gases. The airbag 2221 is arranged inside the battery cell 20, so that the airbag 2221 can respond to the change of the air pressure inside the battery cell 20 and produce deformation. The air pressure inside the airbag 2221 is a set air pressure value, and the set air pressure value is less than the first air pressure threshold value. For example, the first air pressure threshold value may be 1.0 MPa, and the set air pressure value is less than 1.0 MPa.

[0069] When the air pressure inside the battery cell 20 is normal, that is, the air pressure inside the battery cell 20 is lower than a certain value, for example, the air pressure inside the battery cell 20 is lower than the air pressure inside the airbag 2221, the airbag 2221 is in an uncompressed state. At this time, the airbag 2221 does not produce compression deformation, the circuit switch 222 does not operate, and the circuit switch 222 is in an open state, so that the circuit assembly 22 is in an open circuit state.

[0070] When gas is produced inside the battery cell 20, causing the air pressure inside the battery cell 20 to be higher than a certain value, for example, the air pressure inside the battery cell 20 is higher than the air pressure inside the airbag 2221, the airbag 2221 is compressed under the action of the internal and external pressure difference to produce compression deformation, and the airbag 2221 is in a compressed state; when the air pressure inside the battery cell 20 rises and reaches the first air pressure threshold, that is, the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, the compression deformation produced by the airbag 2221 causes the circuit switch 222 to close, so that the circuit component 22 is in a conductive state, and current will pass through the circuit component 22 to achieve electricity storage.

[0071] By setting the circuit switch 222 to include the airbag 2221, and the air pressure in the airbag 2221 is less than the first air pressure threshold, the circuit switch 222 can sense the air pressure change inside the battery cell 20 through the airbag 2221, so as to control the switch state of the circuit switch 222 in response to the air pressure change inside the battery cell 20. In this way, the structure of the circuit switch 222 can be simplified, the reliability of the circuit switch 222 can be improved, and the cost can be reduced.

[0072] In some embodiments, referring to FIG. 5 , the circuit assembly 22 further includes a wire 223, a first electrical connector 224, and a second electrical connector 225. The first electrical connector 224, the energy storage element 221, the circuit switch 222, and the second electrical connector 225 are connected in series through the wire 223 to form the circuit assembly 22. The first electrical connector 224 and the second electrical connector 225 are conductively connected to the battery cell 20 to conductively connect the circuit assembly 22 to the battery cell 20.

[0073] For example, the first electrical connector 224 may be a positive electrode of the circuit assembly 22, and the first electrical connector 224 may include but is not limited to an aluminum sheet. The second electrical connector 225 may be a negative electrode of the circuit assembly 22, and the second electrical connector 225 may include but is not limited to a copper sheet. The aluminum sheet and the copper sheet are used as circuit terminals of the circuit assembly 22. The wire 223 may be any conductive material, and for example, the wire 223 may include but is not limited to a copper wire. The shape of the wire 223 may include but is not limited to a linear or sheet shape.

[0074] In this way, the circuit assembly 22 has a simple and compact structure, which can save space and help reduce costs.

[0075] In some embodiments, referring to FIG. 5, and further referring to FIG. 6 and FIG. 7, FIG. 6 is a schematic diagram of the structure of the circuit switch 222 in the disconnected state provided in some embodiments of the present application, and FIG. 7 is a schematic diagram of the structure of the circuit switch 222 in the closed state provided in some embodiments of the present application; the circuit switch 222 also includes a conductive member 2222 and a switch member 2223. One end of the conductive member 2222 is located inside the airbag 2221, and the other end is located outside the airbag 2221. The conductive member 2222 is used to connect the circuit switch 222 in series to the circuit assembly 22. The switch member 2223 is arranged inside the airbag 2221, and the compression deformation of the airbag 2221 can drive the switch member 2223 to move close to the conductive member 2222. When the air pressure inside the battery cell 20 is greater than or equal to the first air pressure threshold, the switch member 2223 moves to conductive contact with the conductive member 2222, so that the circuit switch 222 is closed. When the air pressure inside the battery cell 20 is lower than the first air pressure threshold, the switch element 2223 is separated from the conductive element 2222 , so that the circuit switch 222 is disconnected.

[0076] The conductive member 2222 and the switch member 2223 may be made of any conductive material, for example, the material of the conductive member 2222 and the switch member 2223 may include but is not limited to copper. The shapes of the conductive member 2222 and the switch member 2223 may include but are not limited to linear or sheet shapes.

[0077] One end of the conductive member 2222 is located outside the airbag 2221, and the other end of the conductive member 2222 is inserted into the airbag 2221. The end of the conductive member 2222 located outside the airbag 2221 is connected to the wire 223, so that the circuit switch 222 is connected in series to the circuit assembly 22. In some embodiments, the number of the conductive members 2222 can be two, and the two conductive members 2222 are arranged at intervals between the ends located inside the airbag 2221. For example, the conductive member 2222 can be a conductive wire inserted through the airbag 2221. The switch member 2223 can be arranged on the inner wall of the airbag 2221, or can be movably arranged in the middle of the airbag 2221, which is not specifically limited here. For example, the switch member 2223 can be a conductive sheet attached to the inner wall of the airbag 2221.

[0078] The airbag 2221 can generate compression deformation under the action of pressure. When the airbag 2221 generates compression deformation, it can drive the switch member 2223 to move, so that the switch member 2223 can move closer to or away from the conductive member 2222, so that the switch member 2223 can operate under the action of pressure.

[0079] When the airbag 2221 is in an uncompressed state, the switch element 2223 is separated from at least one conductive element 2222, the circuit switch 222 is disconnected, and the circuit assembly 22 is in an open circuit state. The airbag 2221 can be compressed and deformed to make the switch element 2223 abut against the conductive element 2222. When the switch element 2223 moves to conductive contact with the conductive element 2222, the circuit switch 222 is closed, and the circuit assembly 22 is in a conducting state.

[0080] By arranging the conductive member 2222 and the switch member 2223 to be connected to the airbag 2221, a switch structure of the airbag 2221 is formed, and the airbag 2221 can be deformed to drive the switch member 2223 to move, so that the switch member 2223 can be operated under pressure to move to connect with or separate from the conductive member 2222, thereby controlling the switch state of the circuit switch 222. In this way, the structure of the circuit switch 222 can be simplified, the reliability of the circuit switch 222 can be improved, and the cost can be reduced.

[0081] 3 and 4 , the battery cell 20 further includes a pressure relief mechanism 28 for releasing the pressure inside the battery cell 20 when the pressure inside the battery cell 20 reaches a second pressure threshold. The second pressure threshold is greater than or equal to the first pressure threshold.

[0082] In order to further improve the safety of the battery cell 20, a pressure relief mechanism 28 may be provided on the battery cell 20. The pressure relief mechanism 28 may include, but is not limited to, an explosion-proof valve and a current cut-off structure. When the battery cell 21 produces gas violently, causing the air pressure inside the battery cell 20 to rise sharply, the pressure relief mechanism 28 can be opened when the air pressure inside the battery cell 20 reaches the second air pressure threshold. The gas inside the battery cell 20 is discharged through the pressure relief mechanism 28 to reduce the air pressure inside the battery cell 20, thereby reducing the risk of fire and explosion of the battery cell 20. Among them, the second air pressure threshold is a pre-set opening pressure value of the battery cell 20 to open the pressure relief mechanism 28. For example, the second air pressure threshold may be in the range of 0.6MPa-1.2MPa.

[0083] Since the pressure relief mechanism 28 is provided, during the process of violent gas production inside the battery cell 20, the internal air pressure of the battery cell 20 will experience a process of rising (before the pressure relief mechanism 28 is opened) and a sudden drop (when the pressure relief mechanism 28 is opened). Since the second air pressure threshold is greater than or equal to the first air pressure threshold, the triggering air pressure value for the circuit switch 222 to perform the closing action is less than or equal to the opening pressure value for opening the pressure relief mechanism 28. During the process of the internal air pressure of the battery cell 20 rising before the pressure relief mechanism 28 is opened, when the air pressure inside the battery cell 20 reaches the first air pressure threshold, the circuit switch 222 is triggered to perform a closing action, turning on the circuit assembly 22, and then turning on the energy storage circuit, so that the circuit assembly 22 can perform the power storage function and realize the storage and consumption of the power of the battery cell 21.

[0084] By setting the second air pressure threshold to be greater than or equal to the first air pressure threshold, the trigger air pressure value for turning on the energy storage circuit is less than or equal to the opening pressure value for opening the pressure relief mechanism 28. During the process of rising air pressure inside the battery cell 20, the energy storage circuit can be turned on before the pressure relief mechanism 28 is opened, which can improve the effectiveness of the energy storage circuit and enable the energy storage circuit to perform its electricity storage function, thereby realizing the storage and consumption of electricity in the battery cell 21, thereby reducing the charge of the battery cell 21, reducing the risk of fire and explosion of the battery cell 20, and improving safety performance.

[0085] In some embodiments, referring to FIG. 3 and FIG. 4 , and further referring to FIG. 8 , FIG. 8 is a top view of the end cap 24 provided in some embodiments of the present application, the battery cell 20 further includes a housing 23 and an end cap 24 , the end cap 24 covers the opening 231 of the housing 23 , the housing 23 and the end cap 24 enclose a receiving space, and the battery cell 21 is received in the receiving space. The circuit assembly 22 is disposed in the receiving space and is located between the end cap 24 and the battery cell 21 .

[0086] The end cap 24 is sealed and installed at the opening 231 of the shell 23, and the battery cell 21 and the circuit assembly 22 are encapsulated in the shell 23. The end cap 24 refers to a component that covers the opening 231 of the shell 23 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 24 can be adapted to the shape of the shell 23 to match the shell 23. Optionally, the end cap 24 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 24 is not easy to deform when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as the first electrode 241 and the second electrode 242 can be provided on the end cap 24. The first electrode 241 and the second electrode 242 can be used to electrically connect with the battery cell 21 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, the end cap 24 can also be provided with a pressure relief mechanism 28 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cover 24 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0087] The shell 23 is a component used to cooperate with the end cap 24 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell 21, the circuit component 22, the electrolyte and other functional components. The shell 23 and the end cap 24 can be independent components, and an opening 231 can be set on the shell 23, and the end cap 24 is made to cover the opening 231 at the opening 231 to form the internal environment of the battery cell 20. Without limitation, the end cap 24 and the shell 23 can also be integrated. Specifically, the end cap 24 and the shell 23 can form a common connection surface before other components are put into the shell, and when the interior of the shell 23 needs to be encapsulated, the end cap 24 is made to cover the shell 23. The shell 23 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 23 can be determined according to the specific shape and size of the battery cell 21. The material of the shell 23 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0088] By arranging the circuit assembly 22 between the end cover 24 and the battery cell 21, a larger installation space can be provided for the circuit assembly 22, and a larger energy storage element 221 can be used to increase the storage capacity, so that more electricity of the battery cell 21 can be stored and consumed, thereby achieving a better effect in reducing the charge of the battery cell 21.

[0089] In some embodiments, referring to FIG. 3 and FIG. 4 , and further referring to FIG. 9 to FIG. 11 , FIG. 9 is a cross-sectional view of the AA section in FIG. 8 , FIG. 10 is a bottom view of the end cap 24 provided in some embodiments of the present application, and FIG. 11 is a schematic diagram of the circuit assembly 22 provided in some embodiments of the present application being disposed on the first insulating member 25 , the battery cell 20 further includes the first insulating member 25 , and the first insulating member 25 is stacked on the inner side of the end cap 24 . The circuit assembly 22 is disposed on the first insulating member 25 .

[0090] A first insulating member 25 may also be provided on the inner side of the end cap 24. The first insulating member 25 may be used to isolate the electrical connection components in the housing 23 from the end cap 24, and play an insulating role to reduce the risk of short circuit and improve the safety performance of the battery cell 20. The first insulating member 25 is made of insulating material. Exemplarily, the insulating material may be plastic, rubber, etc. For example, the first insulating member 25 may be a plastic plate.

[0091] The circuit assembly 22 can be arranged on the first insulating member 25 to form a combination of the circuit assembly 22 and the first insulating member 25. For example, the first insulating member 25 has a certain thickness, and the various components of the circuit assembly 22 can be embedded in the first insulating member 25 having a certain thickness to form an integrated structure. The circuit assembly 22 is a part of the first insulating member 25, constituting the first insulating member 25 of the circuit with a power storage function.

[0092] When the battery cell 20 is assembled, the first insulating member 25 is installed between the inner side of the end cover 24 and the battery cell 21, and the first electrical connector 224 and the second electrical connector 225 of the circuit assembly 22 are electrically connected to the first pole ear 212 and the second pole ear 213 of the battery cell 21 respectively, thereby connecting the circuit assembly 22 to the circuit structure of the battery cell 20, and the circuit assembly 22 and the battery cell 21 form an energy storage circuit.

[0093] By disposing the circuit assembly 22 on the first insulating member 25 , a mounting base can be provided for the circuit assembly 22 , which facilitates the assembly of the circuit assembly 22 in the battery cell 20 , thereby improving assembly efficiency.

[0094] In some embodiments, referring to FIG. 3 and further referring to FIG. 12 to FIG. 14, FIG. 12 is a schematic diagram of a circuit assembly 22 provided in some embodiments of the present application connected in series between the first adapter 261 and the second adapter 262, FIG. 13 is a schematic diagram of a circuit assembly 22 provided in some other embodiments of the present application connected in series between the first adapter 261 and the second adapter 262, and FIG. 14 is a schematic diagram of a circuit assembly 22 provided in some other embodiments of the present application connected in series between the first adapter 261 and the second adapter 262. The battery cell 21 includes a battery cell body 211 and a first pole ear 212 and a second pole ear 213 connected to the battery cell body 211. The battery cell 20 further includes a first electrode 241, a second electrode 242, a first adapter 261, and a second adapter 262. The first adapter 261 is connected between the first electrode 241 and the first pole tab 212, and the second adapter 262 is connected between the second electrode 242 and the second pole tab 213. The first electrode 241 and the second electrode 242 are used to output or input electrical energy of the battery cell 20. The circuit assembly 22 is connected in series between the first adapter 261 and the second adapter 262.

[0095] The battery cell 21 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the battery body 211 of the battery cell 21, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the first pole ear 212 and the second pole ear 213, and the first pole ear 212 and the second pole ear 213 are the positive pole ear and the negative pole ear respectively. The first pole ear 212 and the second pole ear 213 can be located at one end of the battery cell body 211 together or at both ends of the battery cell body 211 respectively. The positive electrode sheet includes a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, the positive current collector not coated with the positive active material layer protrudes from the positive current collector coated with the positive active material layer, and the positive current collector not coated with the positive active material layer constitutes the positive pole ear. Taking lithium-ion batteries as an example, the positive electrode collector can be aluminum foil, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. After the positive electrode active material is stirred and mixed, the positive electrode slurry is obtained, and then the positive electrode slurry is coated on the surface of the positive electrode collector. After baking and drying, the positive electrode sheet is prepared by cold pressing (rolling), pre-slitting, and slitting. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer constitutes the negative electrode ear. The negative electrode collector can be copper foil, and the negative electrode active material can be carbon or silicon. After the negative electrode active material is stirred and mixed, the negative electrode slurry is obtained, and then the negative electrode slurry is coated on the surface of the negative electrode collector. After baking and drying, the negative electrode sheet is prepared by cold pressing, pre-slitting, and slitting. The diaphragm may be at least one of glass fiber cloth, non-woven fabric, polypropylene (PP) film and polyethylene (PE) film; the diaphragm may be a single-layer film or a multi-layer composite film, which is not limited here.

[0096] The first electrode 241 and the second electrode 242 can be used to output or input the electric energy of the battery cell 20. The first electrode 241 and the second electrode 242 can be arranged on the end cover 24, or the first electrode 241 and the second electrode 242 can be arranged on the shell 23, or one of the first electrode 241 and the second electrode 242 can be arranged on the end cover 24 and the other can be arranged on the shell 23. The first electrode 241 and the second electrode 242 are made of conductive materials to realize the input and output of electric energy. The material of the first electrode 241 and the second electrode 242 can be but not limited to copper, aluminum, etc. The shape of the first electrode 241 and the second electrode 242 can be but not limited to a cylinder, a prism, etc. During the charge and discharge process of the battery cell 20, the positive electrode active material and the negative electrode active material react with the electrolyte, the first pole ear 212 is connected to the first electrode 241 through the first adapter 261, and the second pole ear 213 is connected to the second electrode 242 through the second adapter 262 to form a current loop.

[0097] As shown in FIG. 12 , when the battery cell 20 is assembled, the first electrical connector 224 can be connected between the first electrode 241 and the first adapter 261, and the second electrical connector 225 can be connected between the second electrode 242 and the second adapter 262. For example, the first electrical connector 224 can be an aluminum sheet, the first electrode 241 can be a positive electrode column, the first adapter 261 can be a positive electrode adapter, the aluminum sheet is located between the positive electrode column and the positive electrode adapter, and the aluminum sheet, the positive electrode column, and the positive electrode adapter are connected by laser welding. The second electrical connector 225 can be a copper sheet, the second electrode 242 can be a negative electrode column, the second adapter 262 can be a negative electrode adapter, the copper sheet is located between the negative electrode column and the negative electrode adapter, and the copper sheet, the negative electrode column, and the negative electrode adapter are connected by laser welding.

[0098] As shown in FIGS. 13 and 14 , when the battery cell 20 is assembled, the first electrical connector 224 can be connected to the first adapter 261, and the second electrical connector 225 can be connected to the second adapter 262, so as to connect the circuit assembly 22 between the first adapter 261 and the second adapter 262. Then, the first adapter 261 is connected to the first electrode 241, and the second adapter 262 is connected to the second electrode 242.

[0099] Thus, the circuit assembly 22 is connected to the circuit structure of the battery cell 20 through the first adapter 261 and the second adapter 262 , and the circuit assembly 22 and the battery cell 21 form an energy storage loop.

[0100] By connecting the circuit component 22 in series between the first adapter 261 and the second adapter 262, a larger installation space can be provided for the circuit component 22, and a larger energy storage element 221 can be used to increase the storage capacity, so that more electricity of the battery cell 21 can be stored and consumed, and the effect of reducing the charge of the battery cell 21 can be better. In addition, the installation structure of the circuit component 22 is simple, which is conducive to reducing costs.

[0101] In some embodiments, referring to FIG. 15 , FIG. 15 is a schematic diagram of a circuit assembly 22 provided in some embodiments of the present application that is connected in series between a first pole tab 212 and a second pole tab 213 , wherein a cell 21 includes a cell body 211 and a first pole tab 212 and a second pole tab 213 connected to the cell body 211 . The circuit assembly 22 is connected in series between the first pole tab 212 and the second pole tab 213 .

[0102] When the battery cell 20 is assembled, the first electrical connector 224 can be connected to the first pole ear 212, and the second electrical connector 225 can be connected to the second pole ear 213, so as to connect the circuit assembly 22 between the first pole ear 212 and the second pole ear 213 of the battery cell 21. For example, the first electrical connector 224 can be an aluminum sheet, and the second electrical connector 225 can be a copper sheet, and the circuit assembly 22 can be welded to the first pole ear 212 and the second pole ear 213 through the aluminum sheet and the copper sheet, respectively. Then, the first pole ear 212 is connected to the first electrode 241 through the first adapter 261, and the second pole ear 213 is connected to the second electrode 242 through the second adapter 262. In this way, the circuit assembly 22 is connected to the circuit structure of the battery cell 20, and the circuit assembly 22 and the battery cell 21 form an energy storage circuit.

[0103] By connecting the circuit component 22 in series between the first pole ear 212 and the second pole ear 213, a larger installation space can be provided for the circuit component 22, and a larger energy storage element 221 can be used to increase the storage capacity, so that more electricity of the battery cell 21 can be stored and consumed, and the effect of reducing the charge of the battery cell 21 is better. In addition, the installation structure of the circuit component 22 is simple, which is conducive to reducing costs.

[0104] In some embodiments, referring to FIG. 3 , the battery cell 20 may further include a second insulating member 27 , which may wrap the battery cell 21 , and may space the shell 23 and the battery cell 21 to achieve insulation protection for the battery cell 21 . The second insulating member 27 may include an insulating film, which is folded to form a top-opening box body that is substantially the same shape as the shell 23 , but slightly smaller in size. For example, the shell 23 is in the shape of a rectangular parallelepiped, and the second insulating member 27 is folded to form a top-opening rectangular box body that is adapted to the size of the battery cell 21 ; the battery cell 21 is first loaded into the folded second insulating member 27 , and then loaded into the shell 23 together with the second insulating member 27 , so that the second insulating member 27 spaces the battery cell 21 from the shell 23 . The second insulating member 27 may be made of PP (polypropylene) or PET (polyethylene terephthalate), such as Mylar, a tough polyester polymer that has good heat resistance, excellent electrical insulation, and even good electrical performance at high temperature and high frequency.

[0105] According to some embodiments of the present application, referring to Fig. 2, the present application provides a battery 100. The battery 100 includes a battery cell 20 provided by the above embodiments.

[0106] Since the battery 100 has the same technical effects as the above-mentioned battery cell 20 , they will not be described in detail here.

[0107] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery 100 or the battery cell 20 provided in the above embodiments, and the battery 100 and the battery cell 20 are used to provide electrical energy to the electrical device.

[0108] The power-consuming device may be any of the aforementioned devices or systems using the battery 100. Since the power-consuming device has the same technical effects as the aforementioned battery 100 and battery cell 20, it will not be described in detail here.

[0109] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 cell, characterized in that: include: A battery cell and a circuit assembly, wherein the circuit assembly is conductively connected to the battery cell to form an energy storage circuit; the circuit assembly comprises an energy storage element and a circuit switch, and the circuit switch is connected in series with the energy storage element; When the air pressure inside the battery cell is less than a first air pressure threshold, the circuit switch is in an open state, so that the energy storage circuit is in an open circuit state; When the air pressure inside the battery cell is greater than or equal to the first air pressure threshold, the circuit switch is in a closed state so that the energy storage circuit is in a conducting state; the energy storage element is configured to store electrical energy when the energy storage circuit is conducting; Wherein, the circuit switch includes an airbag, the airbag is filled with gas and the air pressure in the airbag is less than the first air pressure threshold, and the airbag is configured to deform in response to the change of air pressure inside the battery cell to turn on or off the energy storage circuit; The battery cell also includes a shell and an end cover, wherein the end cover covers the opening of the shell, and the shell and the end cover enclose a containing space, wherein the battery cell is contained in the containing space; the circuit assembly is arranged in the containing space and is located between the end cover and the battery cell.

2. The battery cell according to claim 1, characterized in that: The circuit switch further comprises a conductive member and a switch member; one end of the conductive member is located inside the airbag and the other end is located outside the airbag, and the conductive member is used to connect the circuit switch in series with the circuit assembly; the switch member is arranged inside the airbag, and the compression deformation of the airbag can drive the switch member to move close to the conductive member; When the air pressure inside the battery cell is greater than or equal to the first air pressure threshold, the switch element moves to be in conductive contact with the conductive element, so that the circuit switch is closed; When the air pressure inside the battery cell is less than the first air pressure threshold, the switch element is separated from the conductive element, so that the circuit switch is disconnected.

3. The battery cell according to claim 1, characterized in that: The circuit assembly also includes a wire, a first electrical connector and a second electrical connector. The first electrical connector, the energy storage element, the circuit switch and the second electrical connector are connected in series through the wire; and the first electrical connector and the second electrical connector are conductively connected to the battery cell.

4. The battery cell according to claim 1, characterized in that: The battery cell further includes a pressure relief mechanism, which is used to release the pressure inside the battery cell when the air pressure inside the battery cell reaches a second air pressure threshold; The second air pressure threshold is greater than or equal to the first air pressure threshold.

5. The battery cell according to claim 4, characterized in that: The pressure relief mechanism includes an explosion-proof valve.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell further includes a first insulating member, which is stacked on the inner side of the end cover; The circuit component is disposed on the first insulating member.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell includes a battery cell body and a first pole tab and a second pole tab connected to the battery cell body; the battery cell also includes a first electrode, a second electrode, a first adapter and a second adapter, the first adapter is connected between the first electrode and the first pole tab, the second adapter is connected between the second electrode and the second pole tab, and the first electrode and the second electrode are used to output or input electrical energy of the battery cell; The circuit component is connected in series between the first adapter and the second adapter.

8. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell comprises a battery cell body and a first pole tab and a second pole tab connected to the battery cell body; The circuit component is connected in series between the first electrode tab and the second electrode tab.

9. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical device comprises the battery according to claim 9 or the battery cell according to any one of claims 1 to 8, and the battery and the battery cell are used to provide electrical energy.

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