Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an end cover assembly, an electrode assembly, a detection part and a connecting piece, the housing has a first opening. The electrode assembly is arranged in the shell. The end cover assembly comprises an end cover and a first insulating part, the end cover is connected to the shell and covers the first opening, at least part of the first insulating part is arranged between the end cover and the electrode assembly, the end cover assembly and the shell define a containing space, the first insulating part is provided with a mounting cavity, and the mounting cavity is communicated with the containing space. The detection component is at least partially arranged in the mounting cavity. The connecting piece is connected to the detection part and extends to the outside of the end cover assembly. And the detection part can detect the environmental parameters in the accommodating space, so that the environmental abnormal condition in the battery monomer can be detected in time before pressure relief, and the reliability is improved. The detection part and the first insulating part can share the space, so that the space utilization rate and the energy density can be improved under the condition of not influencing the performance of the battery monomer.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery, and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are more and more widely used. For example, batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation means such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace.

[0003] The gas environment inside the battery is one of the important factors affecting the reliability of the battery. How to accurately detect the gas environment inside the battery without affecting the performance of the battery is a research direction in this field. Summary of the Utility Model

[0004] The embodiments of this application provide a battery cell, a battery, and an electrical device, which can improve reliability, space utilization rate, and energy density.

[0005] According to the first aspect of this application, this application provides a battery cell, which includes a housing, an end cover assembly, an electrode assembly, a detection component, and a connecting piece. The housing has a first opening. The electrode assembly is disposed inside the housing. The end cover assembly includes an end cover and a first insulating member. The end cover is connected to the housing and covers the first opening. At least part of the first insulating member is disposed between the end cover and the electrode assembly. The end cover assembly and the housing define an accommodation space. The first insulating member has an installation cavity, and the installation cavity communicates with the accommodation space. The detection component is at least partially disposed in the installation cavity and is used to detect the environmental parameters in the accommodation space. The connecting piece is connected to the detection component and extends to the outside of the end cover assembly. The detection component can detect the environmental parameters in the accommodation space, which is beneficial to timely detecting the environmental changes or abnormal conditions inside the battery cell before the battery cell relieves pressure, and is beneficial to managing the working state of the battery cell and improving the reliability of the battery cell. Moreover, the installation cavity accommodates at least part of the detection component, and the detection component and the first insulating member can share at least part of the space, which is beneficial to improving the space utilization rate and energy density without affecting the performance of the battery cell.

[0006] In some embodiments, the installation cavity penetrates the first insulating member along the thickness direction of the end cover, and the end cover blocks at least part of the installation cavity. On the one hand, the end cover can separate at least part of the installation cavity from the external environment and improve the sealing performance of the battery cell; on the other hand, the end cover can also limit the detection component and reduce the possibility of the detection component escaping from the installation cavity.

[0007] In some embodiments, the end cap assembly includes a waterproof and breathable membrane disposed on a side of the first insulating member facing the electrode assembly to seal the installation cavity. The waterproof and breathable membrane can seal the open end of the installation cavity facing the electrode assembly, thereby reducing the possibility of electrolyte leakage and not affecting the detection of environmental parameters in the accommodation space.

[0008] In some embodiments, the first insulating member has a first surface on a side facing the electrode assembly along the thickness direction of the end cap. Along the thickness direction, the detection component does not extend beyond the first surface. The detection component does not occupy the exhaust passage of the battery cell and affect the pressure relief of the battery cell. At the same time, it can also reduce the influence of the pressure relief substance on the detection component.

[0009] In some embodiments, the first insulating member has a first recess on a side facing away from the electrode assembly along the thickness direction of the end cap. The internal space of the first recess forms the installation cavity. The end cap seals at least part of the installation cavity. The first recess has a first bottom wall, and a second opening is provided on the first bottom wall. The installation cavity communicates with the accommodation space through the second opening. At least part of the detection component is clamped between the end cap and the first bottom wall, and the installation of the detection component is more stable and convenient, and it is not easy to break away from the installation cavity.

[0010] In some embodiments, the end cap has a first through hole that communicates the installation cavity with the outside of the end cap assembly. The connecting member passes through the first through hole and extends to the outside of the end cap assembly, which is beneficial to shortening the extension path of the connecting member and reducing the space it occupies.

[0011] In some embodiments, the connecting member is hermetically connected to the first through hole, which is beneficial to improving the sealing performance of the battery cell and reducing the risk of electrolyte leakage from the first through hole.

[0012] In some embodiments, the battery cell includes a sealing assembly disposed on the end cap and configured to form a sealing connection between the connecting member and the first through hole, reducing the assembly difficulty between the connecting member and the first through hole, being beneficial to improving the sealing performance of the battery cell, and reducing the risk of electrolyte leakage from the first through hole.

[0013] In some embodiments, a second recess is provided on a side of the end cap facing away from the electrode assembly. The first through hole communicates with the internal space of the second recess. At least part of the sealing assembly is disposed in the second recess. In the thickness direction, the sealing assembly can share at least part of the space with the end cap, reducing the space occupied by the sealing assembly in the thickness direction, which is beneficial to improving the space utilization rate and energy density of the battery cell.

[0014] In some embodiments, the second recess includes a second bottom wall, and the first through-hole extends through the second bottom wall along the thickness direction of the end cap. The sealing assembly includes a sealing member attached to the second bottom wall and having a second through-hole extending through the sealing member along the thickness direction. The second through-hole is disposed opposite the first through-hole along the thickness direction. The connector is disposed through the second through-hole and has an interference fit therewith. The sealing member can block any gap between the connector and the first through-hole in the thickness direction, thereby improving the sealing performance of the battery cell.

[0015] In some embodiments, the sealing assembly includes a sealing cover, which is disposed on a side of the sealing member facing away from the second bottom wall and connected to the end cap. The sealing cover is provided with a third through-hole, which extends through the sealing cover along the thickness direction. The second through-hole and the third through-hole are disposed opposite each other along the thickness direction. The connector is disposed through the third through-hole and is spaced apart from the wall of the third through-hole. The sealing cover can restrain the sealing member, which is clamped between the sealing cover and the second bottom wall, thereby improving the stability and sealing performance of the seal. The sealing cover can also press the seal member toward the electrode assembly, thereby improving the sealing effect.

[0016] In some embodiments, the interior space of the second recess includes a first portion and a second portion arranged along the thickness direction, wherein the first portion is closer to the second bottom wall than the second portion, and the second portion extends beyond the first portion in a direction perpendicular to the thickness direction, thereby forming a support surface facing the second portion at the junction of the first portion and the second portion; the sealing member is provided in the first portion, and at least a portion of the sealing cover is provided in the second portion, and the sealing cover is connected to the support surface. The support surface and the sealing cover are connected surface-to-surface, thereby increasing the connection area between the two and facilitating the connection strength between the sealing cover and the end cap. Furthermore, the sealing cover and the second recess can share at least a portion of the space in the thickness direction, thereby facilitating improved space utilization and the energy density of the battery cell.

[0017] In some embodiments, the sealing cover has a third surface on the side facing away from the electrode assembly, and the end cover has a second surface on the side facing away from the electrode assembly. The third surface and the second surface are flush, which is beneficial to improving the appearance of the battery cell and reducing the impact on the size of the battery cell along the thickness direction.

[0018] In some embodiments, the sealing assembly includes a second insulating member disposed between the sealing member and the sealing cover. The second insulating member is provided with a fourth through-hole extending through the second insulating member along the thickness direction. The fourth through-hole and the third through-hole are disposed opposite each other along the thickness direction. The diameter of the third through-hole is larger than that of the fourth through-hole. The connector is disposed through the fourth through-hole. The second insulating member can isolate the connector from the sealing cover, thereby reducing the risk of short circuits caused by overlap between the connector and the sealing cover and improving the reliability of the battery cell.

[0019] In some embodiments, the battery cell includes a limiting member. The limiting member is connected to the second insulating member. At least part of the limiting member is disposed in the fourth through hole and clamps the connecting member, which helps to reduce the shaking and displacement of the connecting member and improve the connection stability and reliability between the connecting member and the detecting component.

[0020] In some embodiments, the limiting member includes a main body portion and a clamping portion. The main body portion is inserted into the fourth through hole, and a wire passing space is formed inside the main body portion. At least part of the clamping portion is disposed in the wire passing space and is configured to elastically deform along the radial direction of the fourth through hole to elastically clamp the connecting member, which can reduce the stress concentration on the connecting member and reduce the possibility of damage to the connecting member in the clamped state.

[0021] In some embodiments, a limiting groove is provided on the side of the second insulating member facing away from the sealing member; the limiting member includes a main body portion and a limiting portion. The main body portion is inserted into the fourth through hole, and the limiting portion is disposed on the outer periphery of the main body portion and inserted into the limiting groove to limit the rotation of the limiting member relative to the second insulating member around the axis of the fourth through hole, which helps to reduce the possibility of the limiting member slipping out of the fourth through hole and improve the limiting reliability of the connecting member.

[0022] According to a second aspect of the present application, embodiments of the present application further provide a battery, which includes a plurality of battery cells provided according to any one of the embodiments of the present application.

[0023] In some embodiments, the battery includes a circuit board assembly, and the circuit board assembly is connected to the connecting member.

[0024] According to a third aspect of the present application, embodiments of the present application further provide an electrical device, which includes a battery provided according to any one of the embodiments of the present application, and the battery is used to provide electrical energy. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of a vehicle provided by some embodiments of the present application.

[0027] Figure 2 It is an exploded structural diagram of a battery provided by some embodiments of the present application.

[0028] Figure 3 It is an exploded structural diagram of a battery cell provided by some embodiments of the present application.

[0029] Figure 4It is a schematic cross-sectional structure diagram of a battery cell provided in some embodiments of the present application.

[0030] Figure 5 It is an exploded structure schematic diagram of an end cap assembly of a battery cell and its related structures provided in some embodiments of the present application.

[0031] Figure 6 Is Figure 5 A schematic cross-sectional structure diagram of the end cap assembly shown and its related structures.

[0032] Figure 7 Is Figure 6 An enlarged structure schematic diagram of area A in

[0033] Figure 8 It is a partial cross-sectional structure schematic diagram of an end cap assembly of a battery cell provided in some embodiments of the present application.

[0034] Figure 9 It is a partial cross-sectional structure schematic diagram of an end cap assembly of a battery cell and its related structures provided in some other embodiments of the present application.

[0035] Figure 10 Is Figure 5 An enlarged structure schematic diagram of area B in

[0036] Figure 11 It is an exploded structure schematic diagram of a sealing assembly of a battery cell provided in some embodiments of the present application.

[0037] Figure 12 It is a structure schematic diagram of a limiting member of a battery cell provided in some embodiments of the present application.

[0038] In the drawings:

[0039] Vehicle 1000, battery 100, controller 200, motor 300, box body 10, first box body part 11, second box body part 12, battery cell 20, housing 21, first opening 211, end cap assembly 22, waterproof and breathable film 221, electrode assembly 23, detection component 241, connecting piece 242, accommodation space 25, end cap 26, first through hole 261, second recess 262, first part 2621, second part 2622, support surface 2623, second surface 263, second bottom wall 264, first insulating member 27, installation cavity 271, first surface 272, first recess 273, first bottom wall 274, second opening 275, sealing assembly 28, sealing member 281, second through hole 2811, sealing cover 282, third through hole 2821, third surface 2822, second insulating member 283, fourth through hole 2831, limiting groove 2832, limiting member 29, main body part 291, clamping part 292, clamping arm 2921, wire passing space 293, limiting part 294, circuit board assembly 30, thickness direction X. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0042] [[ID=,10]]In the present application, referring to "embodiment" means that a specific feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0043] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] The term "and / or" in the present application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0045] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only for illustrative purposes and should not constitute any limitation to the present application.

[0046] The term "a plurality of" as used in the present application means two or more (including two).

[0047] In the embodiments of the present application, "parallel" not only includes the case of absolute parallelism, but also includes the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" not only includes the case of absolute perpendicularity, but also includes the case of approximately perpendicularity as conventionally recognized in engineering.

[0048] In the embodiments of the present application, the battery cell may be a secondary battery cell, and a secondary battery cell refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0049] The battery cell may be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited thereto.

[0050] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present application has no special limitation.

[0051] The battery mentioned in the embodiments of the present application refers to a single physical module including a plurality of battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0052] In some embodiments, the box may be a part of the chassis structure of the vehicle. For example, a part of the box may become at least a part of the floor of the vehicle, or a part of the box may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0053] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0054] The gas environment inside the battery is one of the important factors affecting the reliability of the battery. By detecting the gas environment inside the battery, abnormal gas production of the battery can be sensed in advance, and early warnings can be given in a timely manner, reducing the risk of failure such as thermal runaway caused by abnormal faults in the battery.

[0055] In order to detect the gas environment inside the battery, in one solution in the related art, the detection component is arranged inside the housing of the battery cell. The detection component occupies the internal space of the housing, affecting the energy density of the battery cell. Another solution in the related art is to coat a gas-sensitive material at the tab. The gas-sensitive material will affect the welding effect of the tab, increase the internal resistance, and deteriorate the performance of the battery. There is also a solution to arrange the detection component outside the battery cell. The detection component can only detect abnormalities after the explosion-proof valve relieves pressure, and the detection is not timely enough.

[0056] In view of this, the embodiments of the present application provide a technical solution. In this technical solution, the detection component is arranged on the end cover assembly of the battery cell. Specifically, the end cover assembly includes an end cover and a first insulating member. At least part of the first insulating member is located between the end cover and the electrode assembly. The first insulating member is provided with an installation cavity, and the installation cavity communicates with the accommodation space where the electrode assembly is located. At least part of the detection component is arranged in the installation cavity. The gas generated by the electrode assembly can flow through the accommodation space to the installation cavity, and the detection component can detect the environmental parameters in the accommodation space, which is beneficial to detecting the environmental abnormalities inside the battery cell in a timely manner before pressure relief and improving the reliability of the battery cell. Moreover, this technical solution uses the installation cavity to accommodate at least part of the detection component, and the detection component and the first insulating member can share at least part of the space, which is beneficial to improving the space utilization rate and energy density without affecting the performance of the battery cell.

[0057] The technical solution provided by the embodiments of the present application is applicable to battery cells, batteries, and electrical devices using the batteries. The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc. The embodiments of the present application do not make special restrictions on the above electrical devices.

[0058] For the convenience of description, the following embodiments take the electrical device as a vehicle as an example for description.

[0059] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. Refer to Figure 1, Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0060] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Figure 2 is a schematic exploded view of the battery provided in some embodiments of the present application. Refer to Figure 2 , the battery 100 includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body part 11 and a second box body part 12. The first box body part 11 and the second box body part 12 cover each other, and the first box body part 11 and the second box body part 12 together define an accommodation space for accommodating the battery cells 20. The second box body part 12 can be a hollow structure with one end open, and the first box body part 11 can be a plate-like structure. The first box body part 11 covers the open side of the second box body part 12 so that the first box body part 11 and the second box body part 12 together define an accommodation space; the first box body part 11 and the second box body part 12 can also both be hollow structures with one side open, and the open side of the first box body part 11 covers the open side of the second box body part 12. Of course, the box body 10 formed by the first box body part 11 and the second box body part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0062] In the battery 100, there may be multiple battery cells 20. The multiple battery cells 20 can be connected in series, parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, parallel, or in a hybrid connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a hybrid connection to form a whole and are accommodated in the box 10. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0063] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0064] Figure 3 is a schematic exploded view of a battery cell provided in some embodiments of the present application. Figure 4 is a schematic cross-sectional view of a battery cell provided in some embodiments of the present application. Referring to Figure 3 and Figure 4 , the battery cell 20 includes a housing 21, an end cap assembly 22, and an electrode assembly 23. The housing 21 has a first opening 211. The electrode assembly 23 is disposed inside the housing 21.

[0065] Figure 5 is a schematic exploded view of the end cap assembly and its related structures of a battery cell provided in some embodiments of the present application. Referring to Figures 3 to 5 , the end cap assembly 22 includes an end cap 26 and a first insulating member 27. The end cap 26 is connected to the housing 21 and covers the first opening 211. At least a part of the first insulating member 27 is disposed between the end cap 26 and the electrode assembly 23. The end cap assembly 22 and the housing 21 define an accommodation space 25. The first insulating member 27 has an installation cavity 271, and the installation cavity 271 communicates with the accommodation space 25. The battery cell 20 further includes a detection component 241 and a connecting member 242. The detection component 241 is at least partially disposed in the installation cavity 271 for detecting the environmental parameters in the accommodation space 25. The connecting member 242 is connected to the detection component 241 and extends to the outside of the end cap assembly 22.

[0066] The housing 21 and the end cap 26 are independent components. Optionally, the end cap 26 can be connected to the housing 21 by welding, bonding, clamping, or other suitable means.

[0067] The shape of the end cap 26 can be adapted to the shape of the housing 21 to fit the housing 21. The housing 21 and the end cap 26 form the outer shell of the battery cell 20, and the shape of the outer shell can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cuboid structure, a cuboid outer shell can be selected.

[0068] The materials of the housing 21 and the end cap 26 can be the same or different. The materials of the housing 21 and the end cap 26 can be various. For example, the materials of the housing 21 and the end cap 26 can be metal or plastic. Optionally, the materials of the housing 21 and the end cap 26 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0069] The accommodation space 25 is used to accommodate the electrode assembly 23, the electrolyte, and other components.

[0070] The electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The accommodation space 25 can contain one or more electrode assemblies 23. The electrode assembly 23 can be a wound structure, a stacked structure, a wound and stacked composite structure, or other structures.

[0071] The shape of the electrode assembly 23 can be cylindrical, flat, or multi-prismatic, etc.

[0072] The electrode assembly 23 includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode.

[0073] In some embodiments, the electrode assembly 23 further includes a separator disposed between the positive electrode and the negative electrode. The separator can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0074] Optionally, the separator includes a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0075] The first insulating member 27 can be directly connected to the end cap 26. Optionally, the connection manner between the first insulating member 27 and the end cap 26 includes but is not limited to screw connection, riveting, bonding, snap connection, etc. The first insulating member 27 can also be restricted on the end cap 26 through other components.

[0076] In the thickness direction X of the end cap 26, the first insulating member 27 can be entirely located between the end cap 26 and the electrode assembly 23. The first insulating member 27 can also be only partially located between the end cap 26 and the electrode assembly 23, and the other part of the first insulating member 27 can overlap with the electrode assembly 23 or the end cap 26 along the thickness direction X.

[0077] The first insulating member 27 can isolate the electrode assembly 23 and the end cap 26 to reduce the risk of short circuit and improve the reliability of the battery cell 20. The first insulating member 27 can be made of any suitable insulating material. Exemplarily, the first insulating member 27 can be plastic, rubber, etc.

[0078] The shape of the installation cavity 271 can be adapted to the shape of the detection component 241 so that the detection component 241 can be more stably held in the installation cavity 271. Optionally, the cross-sectional shape of the installation cavity 271 along the direction perpendicular to the thickness direction X can be square, circular, oval, etc.

[0079] Exemplarily, at least part of the installation cavity 271 can be directly exposed to the accommodation space 25 to be directly communicated with the accommodation space 25. As another example, the installation cavity 271 and the accommodation space 25 can also be indirectly communicated through a communication structure, which can be, for example, a through hole or a straight or curved extending channel, etc.

[0080] Exemplarily, the detection component 241 can be entirely located in the installation cavity 271, and the detection component 241 and the installation cavity 271 completely share the space without occupying additional space. As another example, a part of the detection component 241 is located in the installation cavity 271 and another part is located outside the installation cavity 271. For example, the part of the detection component 241 located outside the installation cavity 271 can extend beyond the first insulating member 27 towards the end cap 26.

[0081] The detection component 241 can detect the environmental parameters in the space where it is located. The installation cavity 271 where the detection component 241 is located is communicated with the accommodation space 25. Therefore, the detection component 241 can detect the environmental parameters in the accommodation space 25.

[0082] Optionally, the environmental parameters that the detection component 241 can detect can be the concentration of a specific gas, the amount of a specific gas, air pressure, gas type, temperature, etc.

[0083] Optionally, the detection component 241 can be a gas sensor, a pressure sensor, a temperature sensor, etc. For example, the detection component 241 can be a gas-sensitive resistor, and the gas-sensitive resistor includes but is not limited to lanthanum dioxocarbonate material.

[0084] Optionally, the connecting member 242 can be a connecting wire, one end of which is connected to the detection component 241 and the other end extends to the outside of the end cap assembly 22 for connection with external electrical devices, such as a power supply, a signal acquisition device, etc.

[0085] The detection data obtained by the detection component 241 can be transmitted to external electrical devices through the connecting member 242, or the connecting member 242 can also supply power to the detection component 241 through its connection with external electrical devices, etc.

[0086] The number of the connecting members 242 can be one or more than one.

[0087] In the battery cell 20 provided by the embodiment of the present application, by providing an installation cavity 271 communicating with the accommodation space 25 in the first insulating member 27 and disposing at least a part of the detection component 241 in the installation cavity 271, the gas generated by the electrode assembly 23 can flow through the accommodation space 25 to the installation cavity 271, and the detection component 241 can detect the environmental parameters in the accommodation space 25, which is beneficial to timely detecting the environmental changes or abnormal conditions inside the battery cell 20 before the battery cell 20 relieves pressure, is beneficial to managing the working state of the battery cell 20, and improves the reliability of the battery cell 20. Moreover, the installation cavity 271 accommodates at least a part of the detection component 241, and the detection component 241 and the first insulating member 27 can share at least a part of the space, which is beneficial to improving the space utilization rate and energy density without affecting the performance of the battery cell 20.

[0088] Figure 6 is Figure 5 a schematic cross-sectional structure diagram of the end cap assembly and its related structures shown in Figure 7 is Figure 6 an enlarged structure diagram of area A in Figure 8 a partial cross-sectional structure diagram of the end cap assembly of the battery cell provided by some embodiments of the present application. In some embodiments, referring to Figures 6 to 8 , the installation cavity 271 penetrates through the first insulating member 27 along the thickness direction X of the end cap 26, and the end cap 26 blocks at least a part of the installation cavity 271.

[0089] The installation cavity 271 is open on both sides of the first insulating member 27 along the thickness direction X, and the installation cavity 271 forms openings on both sides of the first insulating member 27 along the thickness direction X, which is beneficial to simplifying the forming process of the installation cavity 271.

[0090] The detection component 241 can be inserted into the installation cavity 271 through one of the openings of the installation cavity 271, which is beneficial to simplifying the assembly operation of the detection component 241.

[0091] Optionally, the detection component 241 and the peripheral wall of the installation cavity 271 are connected by suitable means such as bonding, snap connection, interference fit, etc.

[0092] In the direction from the end cap 26 to the electrode assembly 23, the cross-sectional area of the installation cavity 271 along the direction perpendicular to the thickness direction X can gradually decrease, and the detection component 241 can be loaded into the installation cavity 271 from the side of the installation cavity 271 facing the end cap 26. The interaction force between the detection component 241 and the peripheral wall of the installation cavity 271 becomes greater and greater during the process of loading the detection component 241 into the installation cavity 271, which is beneficial to improving the installation stability of the detection component 241 and reducing the risk of the detection component 241 falling off.

[0093] The installation cavity 271 is directly connected to the accommodation space 25 through its opening, which is beneficial to shortening the flow path of the gas in the accommodation space 25 to the detection component 241 and further improving the detection timeliness.

[0094] Exemplarily, the end cap 26 can block a part of the installation cavity 271 in the thickness direction X. The unblocked part of the installation cavity 271 by the end cap 26 can be used for the connector 242 to pass through, so as to facilitate the connection between the connector 242 and the detection component 241. As another example, the end cap 26 can also block the entire installation cavity 271, and the connector 242 is connected to the detection component 241 via other areas of the installation cavity 271.

[0095] The end cap 26 can block at least part of the installation cavity 271 in the thickness direction X. On the one hand, at least part of the installation cavity 271 can be separated from the external environment, improving the sealing performance of the battery cell 20; on the other hand, the end cap 26 can also limit the detection component 241 and reduce the possibility of the detection component 241 escaping from the installation cavity 271.

[0096] In some embodiments, the end cap assembly 22 includes a waterproof breathable membrane 221. The waterproof breathable membrane 221 is disposed on the side of the first insulating member 27 facing the electrode assembly 23 and blocks the installation cavity 271.

[0097] The waterproof breathable membrane 221 can allow gas to pass through and prevent liquid from passing through.

[0098] The waterproof breathable membrane 221 can be connected to the first insulating member 27 by bonding, welding or other suitable methods.

[0099] The first insulating member 27 includes a first surface 272 facing the electrode assembly 23. The waterproof breathable membrane 221 can be attached to the first surface 272 to reduce the gap between the waterproof breathable membrane 221 and the first insulating member 27 and improve the liquid blocking effect.

[0100] The waterproof breathable membrane 221 can close the opening of the installation cavity 271 facing the electrode assembly 23, thereby reducing the possibility of electrolyte leakage. Moreover, the waterproof breathable membrane 221 can also allow the gas in the accommodation space 25 to flow into the installation cavity 271, so that the detection component 241 can effectively detect the environmental parameters in the accommodation space 25.

[0101] In some embodiments, the first insulating member 27 has a first surface 272 on the side facing the electrode assembly 23 in the thickness direction X. In the thickness direction X, the detection component 241 does not extend beyond the first surface 272.

[0102] The side of the detection component 241 facing the electrode assembly 23 is completely located in the installation cavity 271, and will not occupy the space between the first insulating member 27 and the electrode assembly 23, that is, it will not occupy the exhaust channel of the battery cell 20 to affect the pressure release of the battery cell 20. At the same time, it can also reduce the impact of the pressure release material on the detection component 241.

[0103] Figure 9 This is a partial cross-sectional structural diagram of the end cap assembly and related structures of the battery cell provided in some other embodiments of the present application. In some embodiments, refer to Figure 9 The first insulating member 27 has a first recess 273 on the side away from the electrode assembly 23 along the thickness direction X. The internal space of the first recess 273 forms a mounting cavity 271. The end cover 26 blocks at least part of the mounting cavity 271. The first recess 273 has a first bottom wall 274. The first bottom wall 274 is provided with a second opening 275. The mounting cavity 271 is connected to the accommodating space 25 through the second opening 275.

[0104] A side of the first recess 273 facing away from the first bottom wall 274 forms an opening, and the detection component 241 can be installed in the installation cavity 271 through the opening.

[0105] The detection component 241 can be supported on the first bottom wall 274 , and at least a portion of the detection component 241 is clamped between the end cover 26 and the first bottom wall 274 . The installation of the detection component 241 is more stable and convenient, and it is not easy to fall out of the installation cavity 271 .

[0106] In some embodiments, the end cover 26 has a first through hole 261 , which communicates with the mounting cavity 271 and the outside of the end cover assembly 22 , and the connector 242 extends through the first through hole 261 to the outside of the end cover assembly 22 .

[0107] The first through hole 261 passes through the end cover 26 and communicates with the mounting cavity 271 .

[0108] The connecting member 242 extends to the outside of the end cover assembly 22 through the first through hole 261 on the end cover 26, which helps to shorten the extension path of the connecting member 242 and reduce the space it occupies.

[0109] In some embodiments, the connecting member 242 is sealedly connected to the first through hole 261 .

[0110] For example, the connector 242 may be interference-fitted with the wall of the first through hole 261 to achieve sealing. As another example, the connector 242 may also be sealed and connected to the first through hole 261 via a sealing structure.

[0111] In the embodiment of the present application, the connector 242 is sealed to the first through hole 261 , which is beneficial to improving the sealing performance of the battery cell 20 and reducing the risk of electrolyte leakage from the first through hole 261 .

[0112] In some embodiments, referring to Figure 7 and Figure 9 , the battery cell 20 includes a sealing assembly 28 disposed on the end cap 26 and configured to form a sealed connection between the connecting member 242 and the first through hole 261.

[0113] The sealing assembly 28 can be connected to the end cap 26 by welding, bonding, screw connection or other suitable means.

[0114] In the embodiments of the present application, the sealing assembly 28 is used to form a seal between the connecting member 242 and the first through hole 261, reducing the assembly difficulty between the connecting member 242 and the first through hole 261, facilitating the improvement of the sealing performance of the battery cell 20, and reducing the risk of electrolyte leakage from the first through hole 261.

[0115] Figure 10 is Figure 5 an enlarged structural schematic diagram of region B in Figure 7 , Figure 8 and Figure 10 , a second recess 262 is provided on the side of the end cap 26 facing away from the electrode assembly 23, the first through hole 261 communicates with the internal space of the second recess 262, and at least a part of the sealing assembly 28 is disposed in the second recess 262.

[0116] The side of the end cap 26 facing away from the electrode assembly 23 has a second surface 263, and the second recess 262 is recessed in the second surface 263.

[0117] Exemplarily, the sealing assembly 28 can be entirely disposed in the second recess 262, and the sealing assembly 28 does not protrude beyond the second surface 263. As another example, the sealing assembly 28 can also be partially disposed in the second recess 262, and a part of the sealing assembly 28 protrudes from the first surface 263 in the thickness direction X.

[0118] The first through hole 261 communicates with the internal space of the second recess 262, and the connecting member 242 passing through the first through hole 261 can extend to the second recess 262, facilitating the use of the sealing assembly 28 located in the second recess 262 to form a seal between the connecting member 242 and the first through hole 261.

[0119] In the embodiments of the present application, by providing the second recess 262 on the end cap 26 and disposing at least a part of the sealing assembly 28 in the second recess 262, in the thickness direction X, the sealing assembly 28 can share at least a part of the space with the end cap 26, reducing the space occupied by the sealing assembly 28 in the thickness direction X, which is beneficial to improving the space utilization rate and energy density of the battery cell 20.

[0120] Figure 11This is a schematic diagram of the exploded structure of the sealing assembly of the battery cell provided in some embodiments of the present application. In some embodiments, refer to Figures 8 to 11 The second recess 262 includes a second bottom wall 264 , and the first through-hole 261 extends through the second bottom wall 264 along the thickness direction X. The sealing assembly 28 includes a sealing member 281 , which is attached to the second bottom wall 264 and defines a second through-hole 2811 . The second through-hole 2811 extends through the sealing member 281 along the thickness direction X, and the second through-hole 2811 is disposed opposite the first through-hole 261 along the thickness direction X. The connecting member 242 extends through the second through-hole 2811 and has an interference fit therewith.

[0121] The seal 281 can be a structural member capable of performing a sealing function. Optionally, the seal 281 can be a flexible structural member. For example, the seal 281 can be a silicone pad, a rubber pad, or the like. The flexibility of the seal 281 not only improves the sealing effect between the seal 281 and the connector 242, but also prevents damage to the connector 242.

[0122] The sealing member 281 may be connected to the second bottom wall 264 by bonding or other suitable means, or may abut against the second bottom wall 264 under the restriction of other structures to improve the installation stability of the sealing member 281 .

[0123] The diameter of the second through hole 2811 can be smaller than or equal to the diameter of the first through hole 261. In the thickness direction X, the projection of the second through hole 2811 is located within the projection of the first through hole 261. The connector 242 can be loosely fitted with the first through hole 261 to reduce friction between the connector 242 and the wall of the first through hole 261 during the process of the connector 242 being inserted into the first through hole 261, thereby reducing the possibility of damage to the connector 242.

[0124] The connector 242 is inserted through the second through hole 2811 of the seal 281 and forms an interference fit therewith. In the thickness direction X, the seal 281 can block any gap between the connector 242 and the first through hole 261, thereby improving the sealing performance of the battery cell 20. The seal 281 is attached to the second bottom wall 264, which can reduce the gap between the seal 281 and the second bottom wall 264 and improve the sealing effect of the seal 281.

[0125] In some embodiments, the sealing assembly 28 includes a sealing cover 282, which is disposed on a side of the sealing member 281 facing away from the second bottom wall 264 and is connected to the end cap 26. The sealing cover 282 defines a third through hole 2821, which passes through the sealing cover 282 along the thickness direction X. The second through hole 2811 and the third through hole 2821 are disposed opposite each other along the thickness direction X. The connecting member 242 is disposed through the third through hole 2821 and is spaced apart from the wall of the third through hole 2821.

[0126] The sealing cover 282 can be connected to the end cover 26 by welding, bonding, riveting, screw connection or other suitable means.

[0127] The material of the sealing cover 282 can be the same as or different from that of the end cover 26. Optionally, the sealing cover 282 can be made of metal materials such as aluminum, copper, etc. to enhance the structural strength of the sealing cover 282.

[0128] The aperture of the third through-hole 2821 is larger than that of the second through-hole 2811, which is beneficial to reducing the possibility of the connecting member 242 contacting the hole wall of the third through-hole 2821. In the thickness direction X, the center of the third through-hole 2821 can coincide with the center of the second through-hole 2811.

[0129] The first through-hole 261, the second through-hole 2811 and the third through-hole 2821 are arranged opposite to each other in the thickness direction X, and the connecting member 242 can sequentially pass through the first through-hole 261, the second through-hole 2811 and the third through-hole 2821 and extend to the outside of the end cover assembly 22.

[0130] The connecting member 242 is arranged at an interval from the hole wall of the third through-hole 2821, and the connecting member 242 does not contact the hole wall of the third through-hole 2821, reducing the lapping risk.

[0131] The sealing cover 282 can play a limiting role on the seal 281. The seal 281 is clamped between the sealing cover 282 and the second bottom wall 264, improving the stability and sealing performance of the seal 281. The sealing cover 282 can also press the seal 281 towards the electrode assembly 23, which is beneficial to improving the sealing effect.

[0132] In some embodiments, the internal space of the second recess 262 includes a first part 2621 and a second part 2622 arranged along the thickness direction X. The first part 2621 is closer to the second bottom wall 264 than the second part 2622. In the direction perpendicular to the thickness direction X, the second part 2622 extends beyond the first part 2621 to form a support surface 2623 facing the second part 2622 at the junction of the first part 2621 and the second part 2622. The seal 281 is arranged in the first part 2621, at least part of the sealing cover 282 is arranged in the second part 2622, and the sealing cover 282 is connected to the support surface 2623.

[0133] Along the thickness direction X, the projection of the first part 2621 is located within the projection of the second part 2622. Along the direction perpendicular to the thickness direction X, the cross-sectional dimension of the first part 2621 is smaller than that of the second part 2622.

[0134] The sealing cover 282 can fit the support surface 2623 and be connected to the support surface 2623 by bonding, welding or other suitable means.

[0135] The shape and size of the seal 281 can be adapted to the shape and size of the first part 2621 so that the seal 281 can be exactly fitted into the first part 2621.

[0136] The shape and size of the seal cover 282 can be adapted to the shape and size of the second part 2622 so that the seal cover 282 can be at least partially fitted into the second part 2622.

[0137] In a direction perpendicular to the thickness direction X, the seal cover 282 extends beyond the seal 281. The part of the seal cover 282 that extends beyond the seal 281 can be connected to the support surface 2623. The part of the seal cover 282 opposite to the seal 281 in the thickness direction X can cover the seal 281 to limit the seal 281 from moving in a direction away from the electrode assembly 23.

[0138] In the embodiment of the present application, the second recess 262 is provided in two parts. The first part 2621 is used to accommodate the seal 281, and the second part 2622 is used to accommodate at least part of the seal cover 282. The junction of the first part 2621 and the second part 2622 forms the support surface 2623. The seal cover 282 is surface-connected to the support surface 2623, increasing the connection area between the two, which is beneficial to improving the connection strength between the seal cover 282 and the end cap 26. Moreover, the seal cover 282 and the second recess 262 can share at least part of the space in the thickness direction X, which is beneficial to improving the space utilization rate and the energy density of the battery cell 20.

[0139] In some embodiments, one side of the seal cover 282 facing away from the electrode assembly 23 has a third surface 2822, and one side of the end cap 26 facing away from the electrode assembly 23 has a second surface 263. The third surface 2822 and the second surface 263 are flush.

[0140] In the thickness direction X, the seal cover 282 does not extend beyond the second surface 263. That is, the seal cover 282 is completely accommodated in the second part 2622 and does not protrude from the seal cover 282. After the seal cover 282 is connected to the end cap 26, the third surface 2822 and the second surface 263 form a flat surface, which is beneficial to improving the appearance of the battery cell 20 and reducing the influence on the size of the battery cell 20 in the thickness direction X.

[0141] In some embodiments, the sealing assembly 28 includes a second insulating member 283 disposed between the seal 281 and the seal cover 282. The second insulating member 283 is provided with a fourth through-hole 2831 that penetrates the second insulating member 283 in the thickness direction X. The fourth through-hole 2831 and the third through-hole 2821 are disposed opposite to each other in the thickness direction X. The aperture of the third through-hole 2821 is larger than the aperture of the fourth through-hole 2831, and the connecting member 242 is inserted through the fourth through-hole 2831.

[0142] The aperture of the fourth through-hole 2831 may be equal to or slightly larger than the aperture of the second through-hole 2811 to reduce the friction when the connecting member 242 mates with the fourth through-hole 2831, thereby reducing the possibility of damage to the connecting member 242. Optionally, the fourth through-hole 2831 may be in clearance fit with the connecting member 242.

[0143] In the thickness direction X, the seal 281 can block the gap between the connecting member 242 and the fourth through-hole 2831, reducing the possibility of liquid leakage or air leakage.

[0144] The second insulating member 283 can be made of any suitable insulating material. Exemplarily, the second insulating member 283 can be plastic, rubber, etc. The material of the second insulating member 283 can be the same as or different from the material of the first insulating member 27.

[0145] The aperture of the third through-hole 2821 is larger than the aperture of the fourth through-hole 2831. In the thickness direction X, the centers of the third through-hole 2821 and the fourth through-hole 2831 coincide. A part of the second insulating member 283 around the fourth through-hole 2831 is exposed outside the end cap assembly 22 through the third through-hole 2821. The connecting member 242 inserted through the fourth through-hole 2831 can be spaced apart from the hole wall of the third through-hole 2821 by a certain distance. Therefore, the second insulating member 283 can isolate the connecting member 242 and the seal cover 282 to reduce the risk of short circuit caused by the overlap of the connecting member 242 and the seal cover 282, improving the reliability of the battery cell 20.

[0146] It can be understood that the number of the first through-hole 261, the second through-hole 2811, the third through-hole 2821, and the fourth through-hole 2831 is the same as the number of the connecting members 242. Each connecting member 242 extends outside the end cap assembly 22 after passing through the corresponding first through-hole 261, second through-hole 2811, fourth through-hole 2831, and third through-hole 2821 in sequence.

[0147] In some embodiments, referring to Figure 5 , the battery cell 20 includes a limiting member 29. The limiting member 29 is connected to the second insulating member 283. At least part of the limiting member 29 is disposed in the fourth through-hole 2831 and clamps the connecting member 242.

[0148] The limiting member 29 can be connected to the second insulating member 283 by means of snap connection, bonding, interference fit or other suitable means.

[0149] The limiting member 29 can clamp the connecting member 242 passing through the fourth through hole 2831 to limit the connecting member 242, reduce the shaking and displacement of the connecting member 242, and improve the connection stability and reliability between the connecting member 242 and the detecting component 241.

[0150] Figure 12 It is a schematic structural diagram of the limiting member of the battery cell provided by some embodiments of the present application. In some embodiments, referring to Figure 12 , the limiting member 29 includes a main body portion 291 and a clamping portion 292. The main body portion 291 is inserted into the fourth through hole 2831. A wire passing space 293 is formed inside the main body portion 291. At least part of the clamping portion 292 is arranged in the wire passing space 293 and is configured to elastically deform along the radial direction of the fourth through hole 2831 to elastically clamp the connecting member 242.

[0151] The shape of the main body portion 291 is adapted to the fourth through hole 2831. Exemplarily, the fourth through hole 2831 can be a circular through hole, and the main body portion 291 can be a hollow cylinder structure.

[0152] Optionally, the clamping portion 292 includes two clamping arms 2921, and the two clamping arms 2921 are arranged opposite to each other along the radial direction of the fourth through hole 2831. One end of the clamping arm 2921 is connected to the main body portion 291, and the other end is suspended in the wire passing space 293 and can elastically swing along the radial direction of the fourth through hole 2831. The connecting member 242 is clamped between the two clamping arms 2921.

[0153] In the embodiment of the present application, by elastically clamping the connecting member 242 with the clamping portion 292, the stress concentration on the connecting member 242 can be reduced, and the possibility of damage to the connecting member 242 in the clamped state can be reduced.

[0154] In some embodiments, referring to Figure 11 and Figure 12 , a limiting groove 2832 is provided on the side of the second insulating member 283 facing away from the sealing member 281. The limiting member 29 includes a main body portion 291 and a limiting portion 294. The main body portion 291 is inserted into the fourth through hole 2831. The limiting portion 294 is arranged on the outer periphery of the main body portion 291 and is inserted into the limiting groove 2832 to limit the rotation of the limiting member 29 relative to the second insulating member 283 around the axis of the fourth through hole 2831.

[0155] In a direction perpendicular to the thickness direction X, the cross-sectional shape of the limiting portion 294 is the same as that of the limiting groove 2832, so as to facilitate the insertion and cooperation of the limiting portion 294 and the limiting groove 2832, and limit the relative movement between the two in the direction perpendicular to the thickness direction X. For example, the cross-sectional shapes of both the limiting portion 294 and the limiting groove 2832 can be annular, fan-shaped, etc.

[0156] The number of the limiting portions 294 can be one or more. When the number of the limiting portions 294 is multiple, the multiple limiting portions 294 can be arranged at intervals along the outer periphery of the main body portion 291.

[0157] In the embodiment of the present application, the rotation of the limiting member 29 is restricted by the insertion and cooperation of the limiting groove 2832 and the limiting portion 294, which is beneficial to reducing the possibility of the limiting member 29 coming out of the fourth through hole 2831, and improving the limiting reliability of the connecting member 242.

[0158] Optionally, the main body portion 291, the clamping portion 292 and the limiting portion 294 are of an integrally formed structure, and the clamping portion 292 and the limiting portion 294 can also be connected to the main body portion 291 by welding, snap connection or other suitable means.

[0159] According to the second aspect of the present application, an embodiment of the present application further provides a battery 100, which includes a plurality of battery cells 20 provided according to any embodiment of the present application.

[0160] In some embodiments, referring to Figure 2 , the battery 100 includes a circuit board assembly 30, and the circuit board assembly 30 is connected to the connecting member 242.

[0161] The part of the connecting member 242 extending outside the end cover assembly 22 can be connected to the circuit board assembly 30 to transmit data and / or electric energy between the detection component 241 and the circuit board assembly 30.

[0162] The connecting member 242 can be electrically connected to the circuit board assembly 30 by welding, plug-in connectors or other suitable means.

[0163] Optionally, the circuit board assembly 30 can provide power for the detection component 241.

[0164] Optionally, the connecting member 242 can transmit the detection data of the detection component 241 to the circuit board assembly 30.

[0165] Exemplarily, the detection component 241 can be a gas-sensitive resistor, which is used to monitor the change in the gas volume in the detection accommodation space 25 through the change in the resistance value. The management system of the battery 100 monitors and controls the state of the battery 100 through the resistance value change actually collected by the circuit board assembly 30, so as to achieve the purpose of protecting the battery 100 and improving the use safety of the battery 100.

[0166] In some embodiments, the circuit board assembly 30 may include an insulating plate, a flexible circuit board, and a busbar. The insulating plate may be disposed on one side of the plurality of battery cells 20 along the thickness direction X, and the flexible circuit board and the busbar are both disposed on a side of the insulating plate facing away from the battery cells 20. At least a portion of the flexible circuit board and the busbar are separated from each battery cell 20 by the insulating plate.

[0167] The connector 242 can be connected to a flexible circuit board, so that the flexible circuit board can collect detection data of the detection component 241 .

[0168] The flexible circuit board is connected to the electrode terminals of each battery cell 20 through a bus bar to achieve series connection, parallel connection or mixed connection of multiple battery cells 20 .

[0169] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device, which includes the battery 100 provided in any embodiment of the present application, and the battery 100 is used to provide electrical energy.

[0170] An embodiment of the present application provides a battery cell 20, which includes a shell 21, an end cover assembly 22, an electrode assembly 23, a detection component 241 and a connector 242. The shell 21 has a first opening 211. The electrode assembly 23 is disposed in the shell 21. The end cover assembly 22 includes an end cover 26 and a first insulating member 27. The end cover 26 is connected to the shell 21 and covers the first opening 211. At least a portion of the first insulating member 27 is disposed between the end cover 26 and the electrode assembly 23. The end cover assembly 22 and the shell 21 define a receiving space 25. The first insulating member 27 is a plastic member and has an installation cavity 271. The installation cavity 271 is connected to the receiving space 25. The detection component 241 includes a gas sensor, which includes but is not limited to lanthanum dioxycarbonate. The gas sensor is disposed in the installation cavity 271 and is used to detect the amount of gas in the receiving space 25. The connector 242 is connected to the detection component 241 . A portion of the connector 242 extends through the first through hole 261 on the end cover 26 to the outside of the end cover assembly 22 and is connected to the circuit board assembly 30 of the battery 100 .

[0171] 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 it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a first opening; An electrode assembly disposed within the housing; An end cap assembly including an end cap and a first insulating member, the end cap being connected to the housing and covering the first opening, at least a portion of the first insulating member being disposed between the end cap and the electrode assembly, the end cap assembly and the housing defining an accommodation space, the first insulating member having a mounting cavity, the mounting cavity communicating with the accommodation space; A detection component at least partially disposed within the mounting cavity for detecting environmental parameters within the accommodation space; And A connecting member connected to the detection component and extending outside the end cap assembly.

2. The battery cell according to claim 1, wherein The mounting cavity penetrates through the first insulating member in the thickness direction of the end cap, and the end cap blocks at least a portion of the mounting cavity.

3. The battery cell according to claim 2, wherein The end cap assembly includes a waterproof and breathable membrane disposed on a side of the first insulating member facing the electrode assembly and blocking the mounting cavity.

4. The battery cell according to claim 1, wherein A first surface is provided on a side of the first insulating member facing the electrode assembly in the thickness direction of the end cap, and in the thickness direction, the detection component does not extend beyond the first surface.

5. The battery cell according to claim 1, wherein A first recess is provided on a side of the first insulating member facing away from the electrode assembly in the thickness direction of the end cap, an internal space of the first recess forms the mounting cavity, the end cap blocks at least a portion of the mounting cavity, the first recess has a first bottom wall, and a second opening is provided on the first bottom wall, and the mounting cavity communicates with the accommodation space through the second opening.

6. The battery cell according to claim 1, wherein The end cap has a first through hole, the first through hole communicates with the mounting cavity and the outside of the end cap assembly, and the connecting member extends outside the end cap assembly through the first through hole.

7. The battery cell according to claim 6, wherein The connecting member is hermetically connected to the first through hole.

8. The battery cell according to claim 7, wherein The battery cell includes a sealing assembly disposed on the end cap and configured to form a sealing connection between the connecting member and the first through hole.

9. The battery cell according to claim 8, wherein A second recess is provided on a side of the end cap facing away from the electrode assembly, the first through hole communicates with an internal space of the second recess, and at least a portion of the sealing assembly is disposed within the second recess.

10. The battery cell according to claim 9, wherein The second recess includes a second bottom wall, and the first through hole penetrates through the second bottom wall in the thickness direction of the end cap; The sealing assembly includes a sealing member, the sealing member is attached to the second bottom wall, the sealing member is provided with a second through hole, the second through hole passes through the sealing member along the thickness direction, and the second through hole is arranged opposite to the first through hole along the thickness direction; The connecting member is passed through the second through hole and is interference fit with the second through hole.

11. The battery cell according to claim 10, characterized in that The sealing assembly includes a sealing cover, which is arranged on a side of the sealing member away from the second bottom wall and connected to the end cover; The sealing cover is provided with a third through hole, which passes through the sealing cover along the thickness direction. The second through hole and the third through hole are arranged opposite to each other along the thickness direction. The connecting piece is passed through the third through hole and is spaced apart from the hole wall of the third through hole.

12. The battery cell according to claim 11, characterized in that The inner space of the second recess includes a first portion and a second portion arranged along the thickness direction, the first portion is closer to the second bottom wall than the second portion, and the second portion extends beyond the first portion in a direction perpendicular to the thickness direction, so as to form a support surface facing the second portion at a junction of the first portion and the second portion; The sealing member is provided on the first portion, at least a portion of the sealing cover is provided on the second portion, and the sealing cover is connected to the supporting surface.

13. The battery cell according to claim 12, characterized in that: The sealing cover has a third surface on a side facing away from the electrode assembly, the end cover has a second surface on a side facing away from the electrode assembly, and the third surface is flush with the second surface.

14. The battery cell according to claim 11, characterized in that The sealing assembly includes a second insulating member, which is arranged between the sealing member and the sealing cover. The second insulating member is provided with a fourth through hole, which penetrates the second insulating member along the thickness direction. The fourth through hole and the third through hole are arranged opposite to each other along the thickness direction. The aperture of the third through hole is larger than the aperture of the fourth through hole. The connecting member is passed through the fourth through hole.

15. The battery cell according to claim 14, characterized in that The battery cell includes a limiting member connected to the second insulating member. At least a portion of the limiting member is disposed in the fourth through hole and clamps the connecting member.

16. The battery cell according to claim 15, characterized in that The limiting member includes a main body and a clamping portion, the main body is inserted into the fourth through hole, a wire passing space is formed inside the main body, at least a portion of the clamping portion is arranged in the wire passing space, and is configured to generate elastic deformation along the radial direction of the fourth through hole to elastically clamp the connecting member.

17. The battery cell according to claim 15, characterized in that A limiting groove is provided on a side of the second insulating member facing away from the sealing member; The limiting member includes a main body portion and a limiting portion. The main body portion is inserted into the fourth through hole. The limiting portion is disposed on the outer periphery of the main body portion and inserted into the limiting groove to limit the rotation of the limiting member relative to the second insulating member about the axis of the fourth through hole.

18. A battery, characterized in that, Comprising a plurality of battery cells according to any one of claims 1-17.

19. The battery according to claim 18, wherein The battery includes a circuit board assembly, and the circuit board assembly is connected to the connecting member.

20. An electrical device, characterized in that, Comprising the battery according to claim 18 or 19, the battery being used to provide electrical energy.

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