CN220121962U

CN220121962U - Battery cell, battery and electricity utilization device

Info

Publication number: CN220121962U
Application number: CN202320874587.3U
Authority: CN
Inventors: 陈龙; 陈新祥; 郑于炼; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-12-01
Anticipated expiration: 2033-04-18

Abstract

The application discloses a battery cell, a battery and an electric device. The battery cell comprises a shell, an electrode assembly, a circuit board and a detection sensor. The shell comprises a wall part, and the wall part is provided with a mounting hole for communicating the inside and the outside of the shell. The electrode assembly is accommodated inside the case. The circuit board is arranged on the wall part and seals the mounting hole. The detection sensor comprises a sampling module, wherein the sampling module is arranged in a region of the circuit board facing the inside of the shell and exposed through the mounting hole so as to sample the environment inside the shell. Through the mode, the environment information in the shell can be effectively obtained, the space occupation is saved, and the reliability and stability of the battery monomer are improved.

Description

Battery cell, battery and electricity utilization device

Technical Field

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

Background

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

The internal environment of the battery monomer is often complex due to the electrochemical property of the battery monomer, but the current industry lacks of monitoring the internal environment of the battery monomer, so that the internal environment condition of the battery monomer cannot be known timely, and due to the complex internal environment of the battery monomer, various problems and challenges are faced in the aspects of structure, electric connection circuit and the like, so that the volume energy density of the battery is also influenced, and the effective management of the working state of the battery monomer is inconvenient.

Disclosure of Invention

In view of the above problems, the utility model provides a battery cell, a battery and an electricity utilization device, which can effectively acquire environmental information inside a shell, save space occupation and improve the reliability and stability of the battery cell.

In a first aspect, the present utility model provides a battery cell including a housing, an electrode assembly, a circuit board, and a detection sensor. The shell comprises a wall part, and the wall part is provided with a mounting hole for communicating the inside and the outside of the shell. The electrode assembly is accommodated inside the case. The circuit board is arranged on the wall part and seals the mounting hole. The detection sensor comprises a sampling module, wherein the sampling module is arranged in a region of the circuit board facing the inside of the shell and exposed through the mounting hole so as to sample the environment inside the shell.

Through the mode, the sampling module is exposed through the mounting hole, so that the environmental information inside the shell can be effectively obtained, the effectiveness of managing the working state of the battery cell is improved, and the working stability of the battery cell is improved. Through setting up sampling module in the circuit board, can improve the connection stability and the reliability of sampling module and circuit board, and compare with set up sampling module inside the shell and with the circuit board outside the shell connect through connecting wire, can save the connecting wire between circuit board and the sampling module, and then can save the cost, also reduce the influence that receives the battery complex environment because of connecting wire's existence. The sampling module is arranged in the area, facing the inside of the shell, of the circuit board and exposed through the mounting hole, so that the occupied space of the detection sensor in the inside of the shell can be reduced, more accommodating space can be provided for the electrode assembly, the space utilization rate in the inside of the shell is improved, the volume energy density of the battery unit is improved, and the structure of the battery unit is more compact; and moreover, the sealing performance of the inside of the battery can be effectively improved through the circuit board plugging mounting hole, and the safety of the battery monomers is ensured.

In some embodiments, at least a portion of the circuit board is disposed within the mounting hole.

Through the mode, the mounting hole can limit the movement range of the circuit board in the radial direction of the mounting hole, the circuit board can be limited, the circuit board can be mounted conveniently, and at least part of the circuit board is arranged in the mounting hole, so that the space occupation of the circuit board can be reduced, the volume energy density can be improved conveniently, the space is more compact, and the whole battery monomer volume can be reduced conveniently.

In some embodiments, the mounting hole includes a first hole section and a second hole section in communication with each other, the first hole section being closer to the interior of the housing than the second hole section, and a junction of the first hole section and the second hole section being formed with a support mesa facing the second hole section. At least part of the circuit board is arranged on the second hole section and is supported on the supporting table board.

Through the mode, the supporting table surface can limit the circuit board to move towards the inside of the shell, so that the distance between the supporting table surface and the electrode assembly is stable, the probability of short circuit or short circuit between the supporting table surface and the electrode assembly is reduced, in addition, the second hole section can limit the movement range of the circuit board in the radial direction of the mounting hole, and the circuit board is mounted.

In some embodiments, at least a portion of the sampling module is located within the first bore section.

By the mode, the sampling module can directly face the inside of the shell, and is beneficial to quickly and accurately acquiring the environmental information inside the shell; the sampling module at least partially occupies the space of the shell in the first hole section, and does not occupy the space inside the shell, so that the space utilization rate inside the shell can be effectively improved, and the volume energy density is improved; in addition, the first bore may be located further from the electrode assembly than inside the housing, reducing the probability of corrosion and shorting with the electrode assembly.

In some embodiments, the shape of the circuit board and the shape of the second hole section match such that the second hole section is used to locate the circuit board.

Through the mode, the circuit board can be limited to move relative to the wall part along the radial direction of the second hole section, so that the circuit board is positioned and limited, the circuit board is mounted conveniently, and the circuit board is fixed on the wall part more stably and reliably.

In some embodiments, the surface of the board opposite the interior of the housing is flush with or countersunk into the edge of the first aperture segment of the second aperture Duan Yuanli.

Through the mode, when the electrode column is in welded connection with the external part, interference of the circuit board to the external part can be reduced, interference to a welding process is further reduced, and the welding effect of the electrode column and the external part is improved.

In some embodiments, the perimeter of the circuit board is welded to the wall.

Through the mode, on one hand, the sealing can be effectively formed between the circuit board and the wall part, electrolyte leakage is limited, on the other hand, the balanced distribution of acting force between the circuit board and the wall part is facilitated, the connection stability of the circuit board and the wall part is improved, and further the reliability of the battery monomer is improved.

In some embodiments, the circuit board includes a metal substrate that is soldered to the wall portion. Or, the circuit board comprises a substrate main body and a metal frame, the metal frame is sleeved and fixed on the outer periphery of the substrate main body, and the metal frame is welded and fixed with the wall part.

Through the mode, the welding connection between the circuit board and the wall part is facilitated, and the welding reliability between the circuit board and the wall part is further improved.

In some embodiments, the battery cell includes a cage located on a side of the wall portion facing the interior of the housing. The isolation space and the through hole are formed in the isolation cover, the isolation cover is arranged on the periphery of the mounting hole, and the isolation space and the mounting hole are arranged opposite and communicated with each other. The through hole communicates the isolation space with the inside of the housing.

Through the mode, the circuit board and the sampling module are effectively spaced from the electrode assembly, so that direct contact between the sampling module and the electrode assembly is blocked, the probability of short circuit of the sampling module due to contact with the electrode assembly is reduced, and other contact damage of the electrode assembly to the sampling module is reduced. In addition, the isolation cover is also beneficial to reducing the inflow of electrolyte into the mounting holes so as to reduce the contact between the electrolyte and the sampling module and the circuit board, thereby reducing the corrosion damage of the electrolyte to the sampling module.

In some embodiments, the cage is fixedly attached to the wall.

Through the mode, the risk that the position relation between the isolation cover and the wall part is damaged can be reduced, the connection stability of the isolation cover and the wall part is improved, the isolation cover effectively and stably surrounds the mounting hole, and the protection effect of the isolation cover on the sampling module and the circuit board is further effectively exerted.

In some embodiments, the battery cell includes a plastic member disposed on a side of the wall facing the interior of the housing between the wall and the electrode assembly. The isolation cover is arranged on the plastic part.

Through the mode, the partition wall part and the electrode assembly are effectively partitioned, so that the influence of the electrode assembly and electrolyte on the wall part and components (such as a circuit board and a sampling module) on the wall part can be reduced, the wall part is better protected, and the assembly of the isolation cover is facilitated.

In some embodiments, the highest position of the cage in a direction perpendicular to the plastic and away from the wall is lower than the highest position of the plastic in the direction.

Through the mode, the highest position of the plastic part can be supported on the electrode assembly, or can be abutted against the highest position of the plastic part in the direction when the electrode assembly expands or moves towards the wall part, so that further movement of the electrode assembly can be limited, the highest position of the isolation cover and the electrode assembly can be kept at intervals, the risk that the electrode assembly abuts against the isolation cover and blocks the through holes is reduced, sampling of the internal environment of the shell by the sampling module is facilitated, and the influence on sampling is reduced.

In some embodiments, the wall portion is provided with vent holes spaced from the mounting holes. The battery cell also comprises an explosion-proof valve which is arranged on the wall part and covers the vent hole. The plastic part comprises a main body and a cover body, wherein the cover body is arranged on the main body and extends towards one side of the main body, which is away from the wall part. The cover body covers the periphery of the vent hole. Wherein the highest position of the shielding cover in the direction perpendicular to the main body and away from the wall part is lower than the highest position of the cover body in the direction.

By the mode, the explosion-proof valve is arranged, so that the risk of explosion of the battery monomer can be reduced. The explosion-proof valve and the electrode assembly can be prevented from being in direct contact by the cover body, the risk of battery cell short circuit caused by the contact of the electrode assembly and the explosion-proof valve is reduced, meanwhile, the corrosion damage of the electrode assembly to the explosion-proof valve is reduced, the risk of the electrode assembly abutting the isolation cover and blocking the through holes can be reduced, and the sampling module is favorable for sampling the internal environment of the shell.

In some embodiments, the through hole is located at the bottom of the cage and is disposed opposite the sampling module. And/or the number of the through holes is a plurality of, and the through holes are arranged at intervals.

Through the mode, the through holes are opposite to the sampling module, gas can flow in from the through holes and directly flow to the sampling module, the flow path of the gas flow is shortened, and the sampling module is facilitated to rapidly and accurately acquire the environmental information inside the shell.

In some embodiments, the circuit board is disposed on a side of the wall portion facing away from the interior of the housing, and is located outside and covers the mounting hole.

Through the mode, the circuit board is away from the inside of the shell, the influence of complex electrochemical environment in the shell on the circuit board is reduced, the probability of short circuit between the electrode assembly and the circuit board is also reduced, the reliability and the stability of the battery cell are further improved, and the circuit board is convenient to install and detach.

In some embodiments, the battery cell further comprises a processor, and the processor is disposed on the circuit board.

Through the mode, the processor is arranged, so that the battery monomer has the capability of processing data acquired by the detection sensor, the situation of the battery monomer can be effectively monitored by the detection sensor, the intellectualization of the battery monomer is realized, the processor is arranged on the circuit board, the connection stability between the processor and the circuit board can be improved, and the connection stability of the processor and the detection sensor is further improved.

In some embodiments, the housing includes a shell provided with an open end and an end cap provided over the open end, the end cap forming a wall, the electrode assembly being disposed inside the shell. The battery cell comprises two electrode columns arranged at intervals, the two electrode columns are electrically connected with the electrode assembly, the two electrode columns penetrate through the end cover, and the mounting hole is positioned between the two electrode columns.

Through the mode, the circuit board is arranged on the wall part, the space utilization rate of the wall part is improved, the structural compactness of the battery cell is improved, and the electrode assembly can realize charge and discharge through the electrode column.

In some embodiments, the detection sensor includes a conditioning module disposed on the same side of the circuit board as the sampling module or disposed on the circuit board opposite the sampling module.

Through the mode, the conditioning module and the sampling module are arranged on the circuit board in a split mode, the degree of freedom of installation of the conditioning module and the sampling module can be improved, the space occupation of the detection sensor on the whole is optimized, and the volume energy density is improved by being beneficial to the space interference brought by the housing, the electrode assembly and the like compared with the space interference brought by the integration of the conditioning module and the sampling module. And the connection stability between the conditioning module and the circuit board can be improved, so that the connection stability of the conditioning module and the sampling module is improved.

In some embodiments, the detection sensor is a barometric pressure sensor, a gas sensor, or a temperature sensor.

By the mode, the detection sensor is set to be the air pressure sensor, the air pressure inside the shell can be detected, the detection sensor is set to be the air pressure sensor, the type and/or concentration of one or more gases inside the shell can be detected, the detection sensor is set to be the temperature sensor, the temperature inside the shell can be detected, and the management of the working state of the battery cell is facilitated.

In a second aspect, the present application provides a battery comprising the above-described battery cell.

In a third aspect, the present application provides an electrical device comprising a battery as described above.

Drawings

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

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

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

Fig. 3 is an exploded view of a battery cell according to one or more embodiments;

fig. 4 is a partial schematic structure of a battery cell according to one or more embodiments;

FIG. 5 is a schematic block diagram of a circuit configuration of a battery cell according to one or more embodiments;

FIG. 6 is a schematic view of the mounting locations of the circuit board, the detection sensor and the processor shown in FIG. 5;

fig. 7 is an exploded view illustrating a partial structure of the battery cell shown in fig. 4;

FIG. 8 is a schematic top view of the battery cell shown in FIG. 4 with a circuit board partially concealed;

FIG. 9 is a schematic cross-sectional view of a portion of the structure of the battery cell shown in FIG. 8 along section line B-B;

FIG. 10 is a schematic diagram of a circuit board according to one or more embodiments;

FIG. 11 is a schematic diagram of yet another configuration of a circuit board according to one or more embodiments;

FIG. 12 is a schematic view of the portion A shown in FIG. 9;

fig. 13 is yet another schematic illustration of a partial structure of a battery cell according to one or more embodiments;

fig. 14 is a bottom view schematically showing a part of the structure of the battery cell shown in fig. 13;

fig. 15 is a schematic top view of a portion of the structure of the battery cell shown in fig. 13;

FIG. 16 is a schematic cross-sectional view of a portion of the structure of the battery cell shown in FIG. 15 along section line C-C;

Fig. 17 is a schematic view of still another mounting location of the circuit board, detection sensor and processor of fig. 5.

Reference numerals in the specific embodiments are as follows:

1000a of a vehicle;

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

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

1, a battery cell; 100 shells; 101 wall portions; 102 mounting holes; 103 a first bore section; 104 a second bore section; 105 supporting the table top; 106 vent holes; 110 a housing; 111 open ends; 112 opening; 120 end caps; 200 electrode assemblies; 201 pole lugs; 300 circuit boards; 310 a metal substrate; 320 a substrate body; 330 metal rims; 400 detecting a sensor; 410 a sampling module; 420 a conditioning module; 500 isolation covers; 510 isolating the space; 520 through holes; 600 plastic parts; 610 a body; 620 a cover; 621 a protective trough; 700 explosion-proof valve; 701 grooves; an 800 processor; 900 electrode columns.

Detailed Description

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

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

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

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

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

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

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

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

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

Generally, a battery cell includes an electrode assembly, an electrode column, and a case, inside which the electrode assembly can be received. The electrode assembly is electrically connected to the outside through the electrode post. The electrochemical environment inside the shell is complex and closed, so that in the existing battery monomer structure, the environment information inside the shell is difficult to obtain, and the environment information inside the shell is inconvenient to obtain outside the shell, so that the working state of the battery monomer is inconvenient to effectively manage. In the related art, the detection sensor is arranged inside the shell, the outside of the shell is led out through the connecting wire, the connecting wire is easily affected by the complex environment of the battery and various external influences to cause lower reliability of the battery, the cost is higher, the detection sensor is arranged inside the shell and occupies the space inside the shell, the space of the electrode assembly is squeezed, and further, the electrode assembly which is larger or more cannot be placed inside the limited shell is arranged to affect the volume energy density of the battery.

In order to improve the reliability of the battery cell, the effectiveness of the management of the working state is convenient, a detection sensor and a circuit board can be arranged, the detection sensor comprises a sampling module, and the sampling module can acquire the environmental information inside the shell. Specifically, through setting up sampling module in the inside and naked region of circuit board orientation shell, sampling module can directly expose in the inside environment of shell and then sample effectively the inside environment of shell, is favorable to sampling module to acquire the inside environmental information of shell fast accurately. And the sampling module is arranged on the circuit board, so that connecting wires between the sampling module and the circuit board can be saved, the connecting wires are not required to be penetrated outside the shell and inside the shell to connect the detection sensor and the circuit board, the connecting wires can be effectively saved, and the influence of the complex environment and the outside of the battery on the connecting wires is reduced. And can also set up the mounting hole that communicates inside the shell and outside, sampling module sets up in the part that the circuit board exposes through the mounting hole, compares in the direct setting inside the shell, can save sampling module and occupy the space of shell inside, and then reduce the space of crowded occupation electrode assembly, can save space, improve the space utilization of shell, promote the battery compactness to improve volumetric energy density, and then improve battery monomer's reliability and stability. The mounting hole can be used for information transmission between the inside and the outside of the shell, and the circuit board is arranged on the basis to seal the mounting hole, so that the tightness of the shell is improved, and the electrolyte leakage from the mounting hole is limited.

Based on the above considerations, the present application provides a battery cell, a battery and an electrical device. The battery cell comprises a shell, an electrode assembly, a circuit board and a detection sensor. The shell comprises a wall part, and the wall part is provided with a mounting hole for communicating the inside and the outside of the shell. The electrode assembly is accommodated inside the case. The circuit board is arranged on the wall part and seals the mounting hole. The detection sensor comprises a sampling module, wherein the sampling module is arranged in a region of the circuit board facing the inside of the shell and exposed through the mounting hole so as to sample the environment inside the shell. Compare in sampling module and be connected through connecting wire's mode and circuit board, through setting up sampling module in the circuit board, can improve the connection stability and the reliability of sampling module and circuit board, can also save the connecting wire between sampling module and the circuit board, can not need outside the shell and inside wearing of shell to lead connecting wire and connect detection sensor and circuit board, can save connecting wire effectively, reduced the influence that connecting wire was by battery complex environment and external etc.. Through setting up sampling module in the inside and naked region of circuit board orientation shell, reducible detection sensor's in the inside occupation space of shell to can provide more accommodation space for electrode assembly, improve the inside space utilization of shell, thereby improve the elementary volume energy density of battery, make the elementary structure of battery more compact. Thus, the effectiveness of managing the operating state of the battery cell can be improved.

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

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

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

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

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

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

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

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

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

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

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

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

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

Referring to fig. 3, a battery cell 1 refers to the smallest unit constituting a battery. In the present embodiment, a cylindrical battery cell 1 is described as an example. As shown in fig. 3, the battery cell 1 includes a case 100, an electrode assembly 200, and other functional components.

In some embodiments, the housing 100 is used to encapsulate the electrode assembly 200 and electrolyte, among other components. The housing 100 may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), an aluminum-plastic film, or the like.

The housing 100 may include an end cap 120 and a shell 110. The end cap 120 refers to a member that is covered at the opening of the case 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 may be adapted to the shape of the housing 110 to fit the housing 110. Optionally, the end cover 120 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 120 is not easy to deform when being extruded and collided, so that the battery cell 1 can have higher structural strength, and the safety performance can be improved. The end cap 120 may be provided with functional components such as electrode posts 900. The electrode column 900 may be used to be electrically connected with the electrode assembly 200 for outputting or inputting electric power of the battery cell 1. In some embodiments, the end cap 120 may further be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value. The end cap 120 may also be made of a variety of materials, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may also be provided on the inside of the end cap 120, which may be used to isolate the electrical connection members within the housing 110 from the end cap 120 to reduce the risk of short circuits. By way of example, the insulating member may be plastic, rubber, or the like.

The case 110 is an assembly for cooperating with the end cap 120 to form an internal environment of the battery cell 1, wherein the formed internal environment may be used to accommodate the electrode assembly 200, the electrolyte, and other components. The case 110 and the end cap 120 may be separate components, and an opening 112 may be provided in the case 110, and the interior of the battery cell 1 may be formed by covering the opening 112 with the end cap 120 at the opening 112. It is also possible to integrate the end cap 120 and the housing 110, specifically, the end cap 120 and the housing 110 may form a common connection surface before other components are put into the housing, and when the interior of the housing 110 needs to be sealed, the end cap 120 is then covered with the housing 110. The housing 110 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 110 may be determined according to the specific shape and size of the electrode assembly 200. The material of the housing 110 may be various, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The electrode assembly 200 is a component in which electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 200 may be contained within the case 110.

In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

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

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

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

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., liFePO4 (which may also be abbreviated as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., liMnPO 4), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (e.g., liCoO) ₂ ) Lithium nickel oxide (e.g. LiNiO) ₂ ) Lithium manganese oxide (e.g. LiMnO ₂ 、LiMn2O ₄ ) Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., liNi) _1/3 Co _1/3 Mn _1/3 O ₂ (also referred to as NCM) ₃₃₃ )、LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (also referred to as NCM) ₅₂₃ )、LiNi _0.5 Co _0.25 Mn _0.25 O ₂ (also referred to as NCM) ₂₁₁ )、LiNi _0.6 Co _0.2 Mn _0.2 O ₂ (also referred to as NCM) ₆₂₂ )、LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (also referred to as NCM) ₈₁₁ ) Lithium nickel cobalt aluminum oxide (e.g. LiNi _0.85 Co _0.15 Al _0.05 O ₂ ) And at least one of its modified compounds and the like.

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

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

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

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

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

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

In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

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

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

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

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

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

In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.

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

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

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

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

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

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

In some embodiments, the electrode assembly 200 is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly 200 is provided with tabs 201 that can conduct current from the electrode assembly 200. The tab includes a positive tab and a negative tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery 100a, the positive and negative electrode active materials react with the electrolyte, and the tab 201 connects the electrode posts to form a current loop.

According to some embodiments of the present application, as shown in fig. 3 to 6, the battery cell 1 described in the embodiment of the battery cell 1 of the present application includes a case 100, an electrode assembly 200, a circuit board 300, and a detection sensor 400. The housing 100 includes a wall portion 101. The wall 101 may be formed by an end cap 120. In other embodiments, the wall 101 may also be formed by the housing 110. The wall portion 101 is provided with a mounting hole 102 communicating the inside and the outside of the housing 100. The electrode assembly 200 is received inside the case 100. The wiring board 300 is provided to the wall portion 101 and blocks the mounting hole 102. The detection sensor 400 includes a sampling module 410, where the sampling module 410 is disposed in a region of the circuit board 300 facing the interior of the housing 100 and exposed through the mounting hole 102, so as to sample the environment inside the housing 100.

During use of the battery cell 1, the interior of the housing 100 is often subjected to dynamic changes, such as volumetric expansion of the electrode assembly 200, changes in temperature and pressure within the housing 100, or the generation of gases within the housing 100. Environmental information inside the casing 100 may be obtained by the detection sensor 400, for example, gas, temperature or air pressure inside the casing 100 is sampled, so as to improve the effectiveness of managing the working state of the battery cell 1, and further improve the stability of the working of the battery cell 1.

The detection sensor 400 may acquire environmental information inside the housing 100 through the sampling module 410. The wall portion 101 may be used to mount the wiring board 300. The wall 101 is relatively flat, which is advantageous for mounting the circuit board 300. By forming the mounting hole 102 in the wall portion 101, on one hand, the sampling module 410 is facilitated to quickly and accurately obtain the environmental information inside the housing 100, and on the other hand, the environmental information inside the housing 100 obtained by the sampling module 410 can be transmitted to a component outside the housing 100 through the circuit board 300, so as to manage the environment inside the housing 100. By providing the circuit board 300 to block the mounting hole 102, leakage of the electrolyte inside the battery cell 1 through the mounting hole 102 can be restricted.

The wiring board 300 may be electrically connected to the sampling module 410. Because of the complex environment inside and outside the housing 100, if the sampling module 410 is wired to the circuit board 300, there is a high risk of instability in the manner of the wired connection. By disposing the sampling module 410 on the circuit board 300, the connection stability and reliability of the sampling module 410 and the circuit board 300 can be improved compared to the case where the sampling module 410 and the circuit board 300 are connected by wires.

By disposing the sampling module 410 in the exposed area of the circuit board 300 facing the interior of the housing 100, the occupied space of the detection sensor 400 in the interior of the housing 100 can be reduced, so as to provide more accommodation space for the electrode assembly 200, and improve the space utilization rate in the interior of the housing 100, thereby improving the volumetric energy density of the battery cell 1, and making the structure of the battery cell 1 more compact.

Further, the circuit board 300 may block the mounting hole 102 from a side of the wall portion 101 facing away from the inside of the housing 100. The sampling module 410 is disposed within the mounting hole 102 or outside the housing 100, and the sampling module 410 is exposed through the mounting hole 102.

Optionally, as shown in fig. 4 and 7, at least a portion of the circuit board 300 is disposed within the mounting hole 102, according to some embodiments of the present application. Thus, the mounting hole 102 can limit the movement range of the circuit board 300 along the radial direction of the mounting hole 102, which is beneficial to the mounting of the circuit board 300.

Further, in the radial direction of the mounting hole 102, the portion of the circuit board 300 located in the mounting hole 102 may fill the mounting hole 102 to realize plugging of the mounting hole 102.

The axial direction of the mounting hole 102 refers to a direction of spacing between an end of the mounting hole 102 facing the inside of the housing 100 and an end facing away from the inside of the housing 100, and a radial direction of the mounting hole 102 is perpendicular to the axial direction of the mounting hole 102.

Alternatively, the surface of the main body 610 of the circuit board 300 facing the inside of the housing 100 is countersunk into the mounting hole 102. Thus, the probability of interference between the circuit board 300 and the components disposed inside the housing 100 can be reduced.

According to some embodiments of the present application, alternatively, as shown in fig. 8 and 9, the mounting hole 102 includes a first hole section 103 and a second hole section 104 communicating with each other, the first hole section 103 is closer to the inside of the housing 100 than the second hole section 104, and a connection of the first hole section 103 and the second hole section 104 is formed with a support mesa 105 facing the second hole section 104. At least a portion of the circuit board 300 is disposed in the second hole section 104 and supported by the support table 105.

The second hole section 104 may be used to mount the wiring board 300. The support table 105 can limit the movement of the circuit board 300 toward the interior of the housing 100, and the second hole section 104 can limit the movement range of the circuit board 300 along the radial direction of the mounting hole 102, which is beneficial to the mounting of the circuit board 300. A partial region of the circuit board 300 may be exposed through the first hole section 103. The second hole section 104 can stabilize the distance between the second hole section and the electrode assembly 200 by limiting the movement range of the circuit board 300 along the radial direction of the mounting hole 102, and reduce the probability of short circuit or short circuit between the second hole section and the electrode assembly 200.

Optionally, the circuit board 300 is partially located within the first hole section 103 and partially located within the second hole section 104.

Optionally, as shown in fig. 6 and 9, at least part of the sampling module 410 is located within the first bore section 103, according to some embodiments of the present application.

The sampling module 410 may extend from the circuit board 300 toward the inside of the housing 100. Specifically, an end of the sampling module 410 facing away from the interior of the housing 100 may be connected to the circuit board 300. The end of the sampling module 410 near the interior of the housing 100 may extend into the first bore section 103 or through the first bore section 103 to the interior of the housing 100.

With this arrangement, the sampling module 410 can face the inside of the housing 100 directly, which is beneficial for the sampling module 410 to quickly and accurately acquire the environmental information inside the housing 100.

Further, the sampling module 410 may extend from an exposed area of the circuit board 300 toward the inside of the housing 100.

Optionally, as shown in fig. 7 and 9, the shape of the circuit board 300 and the shape of the second hole section 104 match such that the second hole section 104 is used to position the circuit board 300, according to some embodiments of the present application.

For example, the circuit board 300 and the second hole section 104 are both circular or elliptical in shape. For another example, the shapes of the circuit board 300 and the second hole section 104 are both rectangular and two semicircular shapes, wherein the two opposite sides of the rectangle and the two semicircles have the same diameter and length and are connected.

By setting the shape of the circuit board 300 to match the shape of the second hole section 104, the circuit board 300 can be restricted from moving relative to the wall portion 101 in the radial direction of the second hole section 104, thereby positioning the circuit board 300 and facilitating the installation of the circuit board 300.

Optionally, as shown in fig. 4 and 9, the surface of the main body 610 facing away from the interior of the housing 100 of the circuit board 300 is flush with the edge of the second hole section 104 facing away from the first hole section 103 or is countersunk into the second hole section 104, according to some embodiments of the present application.

When the electrode post 900 is welded to an external component, the interference of the circuit board 300 to the welding process can be reduced, and the welding effect of the electrode post 900 and the external component can be improved. For example, the battery cell 1 may be connected to a bus bar (bus bar) through an electrode column 900. The bus bar is a connection row of a multi-layered composite structure, and a plurality of battery cells 1 may be connected in series or in parallel by welding or bolts.

In addition, the circuit board 300 and the wall portion 101 may be connected by soldering, and a soldering operation may be performed on a side of the circuit board 300 facing away from the inside of the housing 100. By arranging the surface of the main body 610 of the circuit board 300 facing away from the interior of the housing 100 to be flush with the hole edge of the second hole section 104 facing away from the first hole section 103 or to be countersunk in the second hole section 104, during the welding process, the circuit board 300 can be melted and form a melt from the side of the circuit board 300 facing away from the interior of the housing 100, so that the circuit board 300 can be connected with the side wall of the second hole section 104 and/or the supporting table 105, thereby improving the welding effect.

Optionally, according to some embodiments of the application, as shown in fig. 4, the periphery of the circuit board 300 is welded to the wall portion 101.

By welding and fixing the periphery of the circuit board 300 and the wall 101, on one hand, a seal can be effectively formed between the circuit board 300 and the wall 101 to limit electrolyte leakage, and on the other hand, the balance distribution of acting force between the circuit board 300 and the wall 101 is facilitated, and the connection stability of the circuit board 300 and the wall 101 is improved.

Further, the circuits and interfaces on the circuit board 300 may be disposed at a position away from the periphery of the circuit board 300, for example, at a middle position of the circuit board 300, so as to reduce the influence of the soldering process on the electrical functions of the circuit board 300.

Optionally, as shown in fig. 10, the circuit board 300 includes a metal substrate 310, and the metal substrate 310 is welded to the wall portion 101 according to some embodiments of the present application.

The metal substrate 310 is made of metal. By providing the metal substrate 310, it is advantageous to achieve a soldered connection between the wiring board 300 and the wall portion 101.

Alternatively, as shown in fig. 11, the circuit board 300 includes a substrate body 320 and a metal frame 330, the metal frame 330 is fixed around the outer periphery of the substrate body 320, and the metal frame 330 is welded to the wall 101.

The metal frame 330 is made of metal. The substrate body 320 may be made of a non-metal material or a polymer material. By providing the metal frame 330, the circuit board 300 and the wall 101 can be welded to each other, and the substrate body 320 made of a non-metal material or a polymer material can be fixed to the wall 101.

According to some embodiments of the present application, alternatively, as shown in fig. 3 and 12, the battery cell 1 includes a separator 500, and the separator 500 is located at a side of the wall portion 101 facing the inside of the case 100. The isolation cover 500 is provided with an isolation space 510 and a through hole 520, the isolation cover 500 is covered on the periphery of the mounting hole 102, and the isolation space 510 and the mounting hole 102 are oppositely arranged and communicated with each other. The through hole 520 communicates the isolation space 510 with the inside of the case 100.

By providing the shield 500, the sampling module 410 and the electrode assembly 200 may be prevented from directly contacting, reducing the risk of the detection sensor 400 being shorted by contact with the electrode assembly 200. In addition, the provision of the shield 500 may reduce corrosion damage of the electrode assembly 200 to the sampling module 410. The cage 500 also facilitates reducing contact of the electrolyte with the sampling module 410, thereby reducing corrosive damage to the sampling module 410 from the electrolyte.

The sampling module 410 may obtain environmental information inside the housing 100 through the through hole 520. By providing the through hole 520, the sampling module 410 is beneficial to quickly and accurately acquiring the environmental information inside the housing 100. For example, a pressure or temperature change inside the housing 100 may cause a corresponding change in the isolated space 510 through the through-hole 520, and then the relevant environmental information is detected by the sampling module 410. For another example, as gas is generated inside the housing 100, the gas may be transferred to the isolation space 510 and the mounting hole 102 through the through hole 520 and then detected by the sampling module 410.

Optionally, the cage 500 is fixedly connected to the wall 101 according to some embodiments of the present application.

By this arrangement, the risk of the positional relationship between the shield 500 and the wall 101 being broken can be reduced, the connection stability between the shield 500 and the wall 101 can be improved, and the shield 500 can effectively protect the sampling module 410.

According to some embodiments of the present application, alternatively, as shown in fig. 3 and 4, the battery cell 1 includes a plastic member 600, and the plastic member 600 is disposed on a side of the wall portion 101 facing the inside of the case 100, between the wall portion 101 and the electrode assembly 200. The isolation cover 500 is disposed on the plastic member 600.

By providing the cage 500 fixedly attached to the plastic member 600, assembly of the cage 500 is facilitated.

Optionally, the plastic part 600 is made of plastic material, which facilitates molding of the plastic part 600.

Further, the plastic member 600 is made of an insulating material, and can form insulation between the electrode assembly 200 and the wall portion 101, so as to limit current from flowing into the wall portion 101 directly from the electrode assembly 200 or flowing into the electrode assembly 200 directly from the wall portion 101.

Alternatively, the plastic member 600 and the isolation cover 500 are integrally injection molded, so that the process flow for preparing the battery cell 1 can be reduced.

Optionally, as shown in fig. 12, the highest position of the cage 500 in a direction perpendicular to the plastic 600 and away from the wall 101 is lower than the highest position of the plastic 600 in the direction, according to some embodiments of the present application. For example, H has a size greater than 0.

The highest position of the plastic member 600 in this direction may be between the separator 500 and the electrode assembly 200, so that the plastic member 600 may function to block the electrode assembly 200 from contacting the separator 500. Specifically, when the electrode assembly 200 expands or moves toward the wall 101, the electrode assembly 200 can abut against the highest position of the plastic member 600 in the direction, so that further movement of the electrode assembly 200 can be limited, the risk that the electrode assembly 200 abuts against the isolation cover 500 and blocks the through hole 520 is reduced, and the sampling module 410 is beneficial to sampling the internal environment of the housing 100.

According to some embodiments of the present application, alternatively, as shown in fig. 12, the wall portion 101 is provided with a vent hole 106 spaced from the mounting hole 102. The battery cell 1 further includes an explosion-proof valve 700, and the explosion-proof valve 700 is provided to the wall portion 101 and covers the vent hole 106. The plastic part 600 includes a main body 610 and a cover 620, wherein the cover 620 is disposed on the main body 610 and extends toward a side of the main body 610 away from the wall 101. The cover 620 covers the periphery of the vent hole 106. Wherein the highest position of the shield 500 in the direction perpendicular to the main body 610 and away from the wall 101 is lower than the highest position of the shield 620 in the direction. Specifically, H has a size greater than 0.

The interior of the housing 100 may contain an electrolyte and an active substance, which may generate gas, causing the pressure inside the housing 100 to rise. The gas is continually accumulated and may cause the pressure within the housing 100 to rise above a pressure threshold. When the pressure exceeds the pressure threshold, the explosion-proof valve 700 may be broken under the pressure so that the inside of the casing 100 communicates with the outside of the casing 100 through the vent hole 106, and the excessive gas inside the casing 100 is discharged, thereby reducing the risk of explosion of the battery cell 1.

When the battery cell 1 releases energy too quickly, it often causes a temperature rise inside the casing 100, which can promote a pressure rise. When the temperature exceeds the temperature threshold, the explosion-proof valve 700 can be destroyed, which is beneficial to alleviating the pressure rise in the casing 100 and reducing the risk of explosion of the battery cell 1.

By providing the cap 620, the explosion-proof valve 700 and the electrode assembly 200 can be prevented from being in direct contact, the risk of short-circuiting of the battery cell 1 due to the contact of the electrode assembly 200 and the explosion-proof valve 700 can be reduced, and the corrosion damage of the electrode assembly 200 to the explosion-proof valve 700 can be reduced. Cover 620 also facilitates reducing contact of the electrolyte with explosion proof valve 700, thereby reducing corrosion damage to explosion proof valve 700 from the electrolyte.

The cover 620 may have a good resistance to deformation. For example, the length dimension of the cover 620 may be greater than the cover 620. By setting the highest position of the separator 500 in the direction perpendicular to the main body 610 and away from the wall 101 to be lower than the highest position of the cap 620 in the direction, the electrode assembly 200 can first abut against and be blocked by the cap 620 when expanding or moving toward the wall 101, so that the risk of the electrode assembly 200 abutting against the separator 500 and blocking the through hole 520 can be reduced, which is advantageous for sampling the internal environment of the case 100 by the sampling module 410.

Optionally, the cover 620 is provided with a protective slot 621 disposed opposite the vent hole 106. By providing the protection groove 621, the interval distance between the electrode assembly 200 and the explosion-proof valve 700 can be increased, and the risk of short-circuiting of the battery cell 1 due to contact of the electrode assembly 200 with the explosion-proof valve 700 can be reduced.

Alternatively, the cover 620 may be forced to move relative to the body 610. When the pressure inside the casing 100 exceeds the pressure threshold, the pressure inside the casing 100 may be transferred to the explosion proof valve 700 through the cover 620, so that the explosion proof valve 700 is broken.

Alternatively, as shown in fig. 12, the explosion proof valve 700 has a groove 701, the groove 701 may reduce the ability of the explosion proof valve 700 to withstand a load such that the explosion proof valve 700 is broken after the pressure inside the housing 100 exceeds a pressure threshold.

Optionally, the burst valve 700 is broken in the form of a split and/or a bend.

Optionally, as shown in fig. 12, a through hole 520 is located at the bottom of the cage 500 and is disposed opposite the sampling module 410, according to some embodiments of the present application.

The change in the environment inside the housing 100 may cause a change in the environment surrounding the sampling module 410 through the through-holes 520. By disposing the through hole 520 opposite the sampling module 410, the sampling module 410 may be directed toward the interior of the housing 100. The bottom of the cage 500 is closer to the interior of the housing 100. This arrangement facilitates the sampling module 410 to quickly and accurately obtain environmental information inside the housing 100.

Further, the detection sensor 400 includes a gas sensor. By providing the through hole 520 opposite to the sampling module 410, the path of gas flowing from the inside of the housing 100 to the mounting hole 102 can be shortened.

Alternatively, the number of the through holes 520 is plural, and the plural through holes 520 are arranged at intervals.

Specifically, the plurality of through holes 520 may be arranged in an array. For example, as shown in fig. 13 to 16, one portion of the plurality of through holes 520 may be arranged in a circular array around another portion. As another example, as shown in fig. 6, a plurality of through holes 520 are arranged in a rectangular array.

By providing a plurality of through holes 520, the synchronism between the environment inside the housing 100 and the environment surrounding the sampling module 410 can be increased, for example, the pressure, temperature or gas change inside the housing 100 can cause the environment surrounding the sampling module 410 to change correspondingly rapidly through the plurality of through holes 520, and then the sampling module 410 detects the relevant environmental information. In this manner, the sampling module 410 is facilitated to quickly and accurately obtain environmental information inside the housing 100.

Optionally, as shown in fig. 3 and 5, a circuit board 300 is disposed on a side of the wall portion 101 facing away from the interior of the housing 100, and is located outside the mounting hole 102 and covers the mounting hole 102, according to some embodiments of the present application.

By disposing the wiring board 300 on the side of the wall portion 101 facing away from the inside of the housing 100, the mounting and dismounting of the wiring board 300 are facilitated.

Optionally, as shown in fig. 17, the battery cell 1 further includes a processor 800, where the processor 800 is disposed on the circuit board 300 according to some embodiments of the present application.

The processor 800 may be disposed on a side of the circuit board 300 facing away from the interior of the housing 100, or the processor 800 may be disposed on a side of the circuit board 300 facing toward the interior of the housing 100. The processor 800 may be used to analyze and process the environmental information obtained by the detection sensor 400, which is beneficial to realizing the intellectualization of the battery cell 1. For example, the processor 800 may determine the gas composition and concentration, temperature or gas pressure inside the case 100 according to the environmental information acquired by the detection sensor 400, thereby analyzing the operation state of the battery cell 1.

The processor 800 may be an integrated circuit chip with signal processing capabilities. Processor 800 may also be a general purpose processor 800, a digital signal processor 800 (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The general purpose processor 800 may be a microprocessor 800 or the processor 800 may be any conventional processor 800 or the like.

For example, processor 800 is an MCU. By disposing the processor 800 on the circuit board 300, the connection stability between the processor 800 and the circuit board 300 can be improved, and the connection stability between the processor 800 and the detection sensor 400 can be further improved.

According to some embodiments of the present application, optionally, as shown in fig. 3 and 4, the housing 100 includes a shell 110 and an end cap 120, the shell 110 is provided with an open end 111, the end cap 120 covers the open end 111, and the end cap 120 forms the wall portion 101. The electrode assembly 200 is disposed inside the case 110. The battery cell 1 includes two electrode columns 900 disposed at intervals, the two electrode columns 900 are electrically connected with the electrode assembly 200, the two electrode columns 900 penetrate through the end cover 120, and the mounting hole 102 is located between the two electrode columns 900.

The open end 111 may be provided with the opening 112. The end cap 120 may serve to position the two electrode columns 900. Specifically, one end of the electrode post 900 is disposed toward the inside of the case 100 and can be used to electrically connect the electrode assembly 200 disposed in the case 100, and the other end of the electrode post 900 is disposed toward the outside of the case 100 and can be connected to the outside, so that the electrode assembly 200 can be charged and discharged through the electrode post 900.

Further, the two electrode posts 900 may be a positive electrode post and a negative electrode post, respectively.

In other embodiments, the housing 110 may form the wall 101. The mounting hole 102 may be formed in the housing 110, for example, in a bottom wall of the housing 110, and the bottom wall of the housing 110 is opposite to the opening end 111. Thus, the mountable area of the detection sensor 400 can be increased.

Optionally, according to some embodiments of the present application, as shown in fig. 17, the detection sensor 400 includes a conditioning module 420, where the conditioning module 420 is disposed on the circuit board 300 on the same side as the sampling module 410, or as shown in fig. 6, the conditioning module 420 is disposed on the circuit board 300 opposite to the sampling module 410.

The sampling module 410 may acquire environmental information inside the housing 100 and output a sampling signal corresponding to the environmental information inside the housing 100. The sampled signals are often analog signals and are not suitable for use in data acquisition, control processes, performing computational display readout, and other applications. The conditioning module 420 may be used to convert the sampled signal to a digital signal, thereby enabling the environmental information inside the housing 100 to be analyzed and processed.

In addition, the sampled signal is often of a relatively small voltage, current, or variation, and the conditioning module 420 may include an amplification circuit that may be used to amplify the sampled signal prior to converting the sampled signal to a digital signal to improve the accuracy of the sampled signal when converted to the digital signal.

Optionally, the conditioning module 420 may further include a filtering circuit that may be used to low pass filter the sampled signal to eliminate noise and prevent aliasing.

By arranging the conditioning module 420 on the circuit board 300, the connection stability between the conditioning module 420 and the circuit board 300 can be improved, and the connection stability between the conditioning module 420 and the sampling module 410 can be further improved.

By disposing the conditioning module 420 on the same side of the sampling module 410 as the circuit board 300, the space occupied by the conditioning module 420 and the sampling module 410 is reduced. By arranging the conditioning module 420 and the sampling module 410 opposite to each other on the circuit board 300, the circuit board 300 can protect the conditioning module 420 and can improve the working stability of the conditioning module 420.

According to some embodiments of the application, the detection sensor 400 is optionally a gas pressure sensor, a gas sensor or a temperature sensor.

An air pressure sensor may be used to detect air pressure within the housing 100. A change in the gas pressure occurs during the operation of the battery cell 1, for example, gas is generated inside the case 100 or the temperature increases, resulting in a rapid increase in the gas pressure. By providing the detection sensor 400 as a gas pressure sensor, the gas pressure inside the housing 100 can be detected, which is advantageous in managing the operation state of the battery cell 1.

The gas sensor may be used to detect a gas constituent within the enclosure 100, such as detecting H ₂ 、CO、CO ₂ Or an organic gas. Some gas may be generated during the operation of the battery cell 1For example, to produce H ₂ 、CO、CO ₂ And one or more of organic gases. By providing the detection sensor 400 as a gas sensor, the type and/or concentration of one or more gases inside the housing 100 can be detected, facilitating management of the operating state of the battery cell 1.

A temperature sensor may be used to detect the temperature within the enclosure 100. A change in temperature, for example, a temperature increase, occurs during the operation of the battery cell 1. By providing the detection sensor 400 as a temperature sensor, the temperature inside the housing 100 can be detected, which is advantageous in managing the operating state of the battery cell 1.

According to some embodiments of the present application, alternatively, as shown in fig. 3 to 17, the battery cell 1 includes a case 100, an electrode assembly 200, a circuit board 300, and a detection sensor 400. The housing 100 includes a wall portion 101, and the wall portion 101 is provided with a mounting hole 102 communicating the inside and the outside of the housing 100. The case 100 includes a case 110 and an end cap 120, the case 110 is provided with an open end 111, the end cap 120 is capped at the open end 111, the end cap 120 and/or the case 110 form a wall portion 101, and the electrode assembly 200 is disposed inside the case 110. The wiring board 300 is provided to the wall portion 101 and blocks the mounting hole 102. The detection sensor 400 includes a sampling module 410, where the sampling module 410 is disposed in a region of the circuit board 300 facing the interior of the housing 100 and exposed through the mounting hole 102, so as to sample the environment inside the housing 100. At least a portion of the circuit board 300 is disposed within the mounting hole 102. The mounting hole 102 includes a first hole section 103 and a second hole section 104 communicating with each other, the first hole section 103 is closer to the inside of the housing 100 than the second hole section 104, and a joint of the first hole section 103 and the second hole section 104 is formed with a support mesa 105 facing the second hole section 104. At least a portion of the circuit board 300 is disposed in the second hole section 104 and supported by the support table 105. At least part of the sampling module 410 is located within the first bore section 103. The shape of the circuit board 300 matches the shape of the second hole section 104 such that the second hole section 104 is used to locate the circuit board 300. The surface of the main body 610 facing away from the interior of the housing 100 of the circuit board 300 is flush with the edge of the second hole section 104 facing away from the first hole section 103 or is countersunk into the second hole section 104. The peripheral edge of the circuit board 300 is welded to the wall 101. The circuit board 300 includes a metal substrate, and the metal substrate is soldered to the wall 101. Alternatively, the circuit board 300 includes a substrate body 320 and a metal frame 330, the metal frame 330 is fixed around the outer periphery of the substrate body 320, and the metal frame 330 is welded to the wall 101. The battery cell 1 includes a separator 500, and the separator 500 is located on a side of the wall portion 101 facing the inside of the case 100. The isolation cover 500 is provided with an isolation space 510 and a through hole 520, the isolation cover 500 is covered on the periphery of the mounting hole 102, and the isolation space 510 and the mounting hole 102 are oppositely arranged and communicated with each other. The through hole 520 communicates the isolation space 510 with the inside of the case 100. The cage 500 is fixedly attached to the wall 101. The battery cell 1 includes a plastic member 600, and the plastic member 600 is disposed on a side of the wall portion 101 facing the interior of the case 100, and is located between the wall portion 101 and the electrode assembly 200. The isolation cover 500 is disposed on the plastic member 600. The highest position of the shield 500 in the direction perpendicular to the plastic 600 and away from the wall 101 is lower than the highest position of the plastic 600 in the direction. The wall 101 is provided with a vent hole 106 spaced from the mounting hole 102. The battery cell 1 further includes an explosion-proof valve 700, and the explosion-proof valve 700 is provided to the wall portion 101 and covers the vent hole 106. The plastic part 600 includes a main body 610 and a cover 620, wherein the cover 620 is disposed on the main body 610 and extends toward a side of the main body 610 away from the wall 101. The cover 620 covers the periphery of the vent hole 106. Wherein the highest position of the shield 500 in the direction perpendicular to the main body 610 and away from the wall 101 is lower than the highest position of the shield 620 in the direction. The through hole 520 is located at the bottom of the isolation cover 500 and is disposed opposite to the sampling module 410. The number of the through holes 520 is plural, and the plural through holes 520 are arranged at intervals. The circuit board 300 is disposed on a side of the wall portion 101 facing away from the interior of the housing 100, and is located outside the mounting hole 102 and covers the mounting hole 102. The battery cell 1 further includes a processor 800, and the processor 800 is disposed on the circuit board 300. The battery cell 1 includes two electrode columns 900 disposed at intervals, the two electrode columns 900 are electrically connected with the electrode assembly 200, the two electrode columns 900 penetrate through the end cover 120, and the mounting hole 102 is located between the two electrode columns 900. The detection sensor 400 includes a conditioning module 420, where the conditioning module 420 and the sampling module 410 are disposed on the same side of the circuit board 300 or disposed on the circuit board 300 opposite to each other. The detection sensor 400 is a gas pressure sensor, a gas sensor, or a temperature sensor.

According to some embodiments of the present application, as shown in fig. 2, a battery 100a includes the above-described battery cell 1. So set up, can be through obtaining the inside environmental information of shell 100 fast accurately, improve the validity of managing battery cell 1 operating condition to stability and reliability when improving battery cell 1 during operation, and be favorable to improving battery cell 1's volume energy density, and then improve battery 100a during operation's stability and reliability, and improve battery 100 a's volume energy density, make battery 100 a's structure compacter.

According to some embodiments of the present application, as shown in fig. 1, the power consumption device includes the above-described battery 100a. By the arrangement, on one hand, the stability and the reliability of the battery unit 1 during operation can be improved to improve the stability and the reliability of the battery 100a during operation, and further the stability and the reliability of the electric device during operation can be improved, and on the other hand, the space occupied by the battery 100a in the electric device can be reduced by improving the structural compactness of the battery 100a, so that the improvement of the operating state of the electric device can be promoted.

In summary, the embodiment of the application can obtain the environmental information inside the housing 100, and improve the effectiveness of managing the working state of the battery cell 1, thereby improving the stability of the working of the battery cell 1.

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

Claims

1. A battery cell, comprising:

the shell comprises a wall part, wherein the wall part is provided with a mounting hole for communicating the inside and the outside of the shell;

an electrode assembly accommodated inside the case;

a wiring board provided to the wall portion and closing the mounting hole;

The detection sensor comprises a sampling module, wherein the sampling module is arranged in an area, exposed through the mounting hole, of the circuit board facing the inside of the shell so as to sample the environment inside the shell.

2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

at least part of the circuit board is arranged in the mounting hole.

3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells,

the mounting hole comprises a first hole section and a second hole section which are communicated with each other, the first hole section is closer to the inside of the shell than the second hole section, and a supporting table surface facing the second hole section is formed at the joint of the first hole section and the second hole section; at least part of the circuit board is arranged on the second hole section and supported on the supporting table top.

4. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells,

at least a portion of the sampling module is located within the first bore section.

5. The battery cell according to claim 3 or 4, wherein,

the shape of the circuit board is matched with the shape of the second hole section, so that the second hole section is used for positioning the circuit board.

6. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells,

the surface of the circuit board facing away from the inside of the shell is flush with the hole edge of the first hole section of the second hole Duan Yuanli or is sunk in the second hole section.

7. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

and the periphery of the circuit board is welded and fixed with the wall part.

8. The battery cell of claim 7, wherein the battery cell comprises a plurality of cells,

the circuit board comprises a metal substrate, and the metal substrate is welded and fixed with the wall part; or, the circuit board comprises a substrate main body and a metal frame, wherein the metal frame is sleeved and fixed on the outer periphery of the substrate main body, and the metal frame is welded and fixed with the wall part.

9. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the battery unit comprises a shielding cover, wherein the shielding cover is positioned on one side of the wall part facing the inside of the shell; the isolation cover is provided with an isolation space and a through hole, the isolation cover is arranged on the periphery of the mounting hole, and the isolation space and the mounting hole are oppositely arranged and communicated with each other; the through hole communicates the isolation space with the inside of the housing.

10. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells,

the shield is fixedly connected to the wall portion.

11. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells,

the battery unit comprises a plastic part, wherein the plastic part is arranged on one side of the wall part facing the inside of the shell and is positioned between the wall part and the electrode assembly; the isolation cover is arranged on the plastic part.

12. The battery cell of claim 11, wherein the battery cell comprises a plurality of cells,

the highest position of the isolation cover in the direction perpendicular to the plastic part and far away from the wall part is lower than the highest position of the plastic part in the direction.

13. The battery cell of claim 11, wherein the battery cell comprises a plurality of cells,

the wall part is provided with vent holes which are arranged at intervals with the mounting holes; the battery cell also comprises an explosion-proof valve, wherein the explosion-proof valve is arranged on the wall part and covers the vent hole; the plastic part comprises a main body and a cover body, and the cover body is arranged on the main body and extends to one side of the main body, which is away from the wall part; the cover body is covered on the periphery of the vent hole; wherein the highest position of the shield in a direction perpendicular to the main body and away from the wall portion is lower than the highest position of the shield body in the direction.

14. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells,

the through hole is positioned at the bottom of the isolation cover and is opposite to the sampling module; and/or the number of the through holes is a plurality of, and the through holes are arranged at intervals.

15. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the circuit board is arranged on one side of the wall part, which is away from the inside of the shell, and is positioned outside the mounting hole and covers the mounting hole.

16. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the battery cell also comprises a processor, and the processor is arranged on the circuit board.

17. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the shell comprises a shell body and an end cover, wherein the shell body is provided with an opening end, the end cover is covered on the opening end, the end cover forms the wall part, and the electrode assembly is arranged in the shell body; the battery cell comprises two electrode columns arranged at intervals, the two electrode columns are electrically connected with the electrode assembly, the two electrode columns penetrate through the end cover, and the mounting hole is positioned between the two electrode columns.

18. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the detection sensor comprises a conditioning module, and the conditioning module and the sampling module are arranged on the same side of the circuit board or are arranged on the circuit board in a back-to-back mode.

19. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the detection sensor is a gas pressure sensor, a gas sensor or a temperature sensor.

20. A battery comprising a cell according to any one of claims 1-19.

21. An electrical device comprising a battery as claimed in claim 20.