CN219873676U

CN219873676U - Battery cell, battery and electricity utilization device

Info

Publication number: CN219873676U
Application number: CN202321707300.4U
Authority: CN
Inventors: 吴凯; 陈龙; 郑于炼; 郭小永; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-07-03
Filing date: 2023-07-03
Publication date: 2023-10-20
Anticipated expiration: 2033-07-03

Abstract

The application discloses a battery cell, a battery and an electric device. Wherein, the battery cell includes: 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 sampling assembly is accommodated in the shell; and a plurality of connecting parts in insulating connection are arranged in the mounting holes and are used for blocking the mounting holes, and the connecting parts are electrically connected with the sampling assembly. Through the mode, the number of the holes on the shell of the battery monomer can be reduced, so that the strength of the battery monomer is improved, the risk of failure of the structural strength of the battery monomer is reduced, the process can be simplified, and the cost is saved; further, the occupied space of the opening can be reduced, and the compactness of the structure is 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.

Generally, the battery cell includes a housing, and an electrode assembly and a sampling assembly accommodated in the housing, wherein the electrode assembly is electrically connected with the outside through an electrode column, and the sampling assembly is electrically connected with the outside through a connecting column. In the structure of the existing battery cell, the sampling assembly generally includes one or more connection posts, and when the number of the sampling assembly is plural, the number of the connection posts is increased. In order to facilitate the installation of the connection post, a plurality of installation holes are usually formed in the housing, so that the connection post is electrically connected with the outside through correspondingly installing the connection posts at the installation holes. But such a structure increases the risk of structural strength failure of the battery cell.

Disclosure of Invention

In view of the above problems, the present utility model provides a battery cell, a battery and an electric device, which can reduce the number of openings on a housing of the battery cell, so as to improve the strength of the battery cell, reduce the risk of failure of the structural strength of the battery cell, simplify the process, and save the cost; further, the occupied space of the opening can be reduced, and the compactness of the structure is improved.

In a first aspect, the present utility model provides a battery cell, which at least includes: 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 sampling assembly is accommodated in the shell; and a plurality of connecting parts in insulating connection are arranged in the mounting holes and are used for blocking the mounting holes, and the connecting parts are electrically connected with the sampling assembly.

Through the mode, the plurality of connecting parts for insulating connection for plugging the mounting holes can be mounted through the same mounting hole on the shell, namely, the plurality of connecting parts for insulating connection are mounted through one mounting hole, so that the number of the mounting holes on the shell can be reduced. On the one hand, the strength of the shell can be reduced along with the increase of the number of the mounting holes, so that the structure can increase the strength of the shell and reduce the risk of failure of the structural strength of the battery cell; on the other hand, the sealing performance of the shell is also reduced along with the increase of the number of the mounting holes, so that the structure can also improve the sealing performance of the shell; on the other hand, as the connecting post corresponding to each mounting hole needs to be mounted at the corresponding mounting hole, i.e. needs to be fixedly connected with the housing, the complexity of the battery cell process is increased along with the increase of the number of the mounting holes, for example, the step surface needs to be processed for each mounting hole on the housing, and the cost is high, therefore, the structure can also reduce the process complexity of the battery cell and save the cost. Further, a plurality of connecting portions connected in an insulating manner are integrally arranged in the same mounting hole, and compared with the case that no connecting portion is provided with an independent mounting hole, the mounting hole can be reduced in occupied area on the shell, and further the compactness of the structure can be improved.

In some embodiments, the plurality of connection portions includes a first connection portion disposed along the predetermined axis and a second connection portion circumferentially surrounding at least a portion of an outer circumference of the first connection portion. The first connecting parts are arranged along the preset axis, so that the occupied area of a plurality of connecting parts in insulation connection on the wall part can be reduced, the opening area of the mounting hole can be reduced, and the strength and the sealing performance of the wall part are improved; the second connecting part is arranged around at least part of the periphery of the first connecting part, so that the arrangement area between the second connecting part and the first connecting part can be reduced, the opening area of the mounting hole can be further reduced, and the strength and the sealing performance of the wall part can be further improved; and the compactness of the structure can be improved.

In some embodiments, the second connecting portion is closed around the outer periphery of the first connecting portion. The second connecting part is closed and surrounds the periphery of the first connecting part, and the second connecting part is sleeved on the periphery of the first connecting part, so that the occupied area of the second connecting part and the first connecting part on the wall part can be further reduced, the opening area of the mounting hole can be reduced, and the strength and the sealing performance of the wall part are further improved; and the compactness of the structure can be improved. And the size of the second connecting part is increased, so that the electrical performance is improved.

In some embodiments, the number of the second connection parts is at least two, and the at least two second connection parts are arranged at intervals along the circumferential direction of the first connection part. Through the mode, at least three connecting portions can be realized, the second connecting portions are arranged around at least part of the periphery of the first connecting portion, and the arrangement area between the second connecting portions and the first connecting portion can be reduced, so that the opening area of the mounting hole can be further reduced, the strength and the sealing performance of the wall portion can be further improved, and the compactness of the structure can be improved.

In some embodiments, the connection portion is disposed around the preset axis, and the plurality of connection portions are spaced apart from each other along a circumference of the preset axis. The connecting portion is arranged around the preset axis, and the connecting portions are spaced from each other along the circumferential direction of the preset axis, so that the connecting portions are located on the same periphery of the outer side of the preset axis, the occupied area of the connecting portions on the wall portion can be reduced, the opening area of the mounting hole can be reduced, the strength and sealing performance of the shell can be improved, and the compactness of the structure is improved.

In some embodiments, the battery cell further comprises: and the insulating piece is arranged among the plurality of connecting parts. An insulating member is disposed between the adjacently disposed connection parts to improve interference between the connection parts, such as electrical signal interference, etc., to improve reliability of the battery cell.

In some embodiments, the battery cell further includes a fixing member to which the connection portion is fixed, the fixing member fixing the connection wall portion. The connecting part and the wall part are connected through the fixing piece, so that the stability between the connecting part and the wall part can be improved, and the damage of the mounting process to the connecting part and the like can be reduced.

In some embodiments, the securing member is secured around at least a portion of the periphery of the connecting portion along the circumference of the connecting portion. The fixing piece is arranged on the periphery of the connecting portion, the fixing piece can be conveniently arranged between the inner wall of the mounting hole and the connecting portion, the fixing piece is positioned in the mounting hole, the connection stability between the inner wall of the mounting hole and the connecting portion can be increased, and the interference of the fixing piece to the inside or the outside structure of the housing can be reduced.

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 in communication with the exterior of the housing, the second hole section in communication with the interior of the housing, the first hole section and the second hole section forming a stepped surface at a junction therebetween facing the exterior of the housing, the fixture being supported on the stepped surface. The step surface can limit the movement of the fixing piece towards the inside of the shell, the first hole section and the second hole section can limit the radial movement range of the fixing piece along the mounting hole, the mounting of the fixing piece is facilitated, and the fixing piece can be kept stable in structure after being mounted.

In some embodiments, the mount comprises: the fixed section and the inserting section that set up along predetermineeing the axis direction, the inserting section sets up in the second hole section, and the fixed section sets up in the first hole section, and supports on the step face. The step surface can limit the movement of the fixed section towards the inside of the shell, the second hole section can limit the movement range of the fixed section along the radial direction of the mounting hole, and the first hole section can limit the movement range of the inserting section along the radial direction of the mounting hole, so that the mounting of the fixing piece is facilitated.

In some embodiments, the battery cell further comprises: the sealing ring is arranged between the fixed section and the step surface to improve the sealing performance between the fixed section and the step surface and further improve the reliability of the battery monomer.

In some embodiments, the housing includes a shell provided with an open end and an end cap provided over the open end, the sampling assembly being housed inside the shell; the end cover forms a wall part; the mounting hole is formed in the end cover. The mounting holes are formed in the end cover, so that the mounting holes can be plugged.

In some embodiments, the sampling assembly includes a plurality of sampling modules, and each sampling module is connected to at least one connection portion, and the accessible sampling module obtains the inside environmental information of shell to can improve the validity of managing battery cell operating condition, and then improve battery cell operating stability.

In some embodiments, the battery cell further comprises: the circuit board is arranged outside the shell and is electrically connected with the connecting part. The circuit board which is arranged outside the shell and is electrically connected with the connecting part is used for processing the environmental information acquired by the sampling assembly so as to determine the gas composition, concentration, temperature or air pressure inside the shell, thereby analyzing the working state of the battery cell.

In some embodiments, the circuit board is disposed on a side of the wall portion facing away from the sampling assembly. The circuit board is arranged on one side, away from the sampling assembly, of the wall portion, namely the outer portion of the shell, so that the circuit board can be conveniently installed and detached. The wall portion can prevent the circuit board from contacting the electrode assembly and the electrolyte, reduce the risk of short-circuiting of the circuit board due to contact with the electrode assembly, and reduce corrosion of the circuit board by the electrode assembly and the electrolyte.

In a second aspect, the present application provides a battery comprising the above-described battery cell. By the arrangement, the number of the holes on the shell of the battery monomer can be reduced, so that the strength of the battery monomer is improved, the risk of failure of the structural strength of the battery monomer is reduced, the process can be simplified, and the cost is saved; further, the occupied space of the opening can be reduced, and the compactness of the structure is improved.

In some embodiments, the battery further comprises: and a battery management unit electrically connected with the connection part. The battery management unit is electrically connected with the connecting part, so that the battery management unit automatically manages the battery cells according to the environmental information obtained by the sampling assembly.

In some embodiments, the battery further comprises: the battery monomer is arranged in the box body; the circuit board is arranged outside the box body and is electrically connected with the connecting part. The circuit board which is arranged on the box body and is electrically connected with the connecting part is used for processing the environmental information acquired by the sampling assembly so as to determine the gas composition, concentration, temperature or air pressure in the shell, and thus the working state of the battery cell is analyzed.

In a third aspect, the present application provides an electrical device comprising a battery as described above. By the arrangement, the number of the holes on the shell of the battery monomer can be reduced, so that the strength of the battery monomer is improved, the risk of failure of the structural strength of the battery monomer is reduced, the process can be simplified, and the cost is saved; further, the occupied space of the opening can be reduced, and the compactness of the structure is improved.

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 block schematic diagram of a battery cell according to one or more embodiments;

FIG. 5 is a schematic view of the wall, electrode post, connection portion, and plastic member of the battery cell shown in FIG. 3;

FIG. 6 is a schematic top view of the structure of FIG. 5;

FIG. 7 is a schematic view of a partial structure of a cross section of the structure of FIG. 6 taken along section line A-A;

FIG. 8 is an enlarged schematic view of structure B in the structure shown in FIG. 7;

fig. 9 is another structural schematic diagram of a battery cell according to one or more embodiments;

fig. 10 is a further structural schematic diagram of a battery cell according to one or more embodiments;

fig. 11 is a schematic view of yet another structure of a battery cell according to one or more embodiments.

Reference numerals in the specific embodiments are as follows:

1000a of a vehicle;

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

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

1, a battery cell; 100 shells; 101 wall portions; 102 mounting holes; 142 a first bore section; 122 a second bore section; 132 step surface; 110 a housing; 111 open ends; 112 opening; 120 end caps; 152 sealing rings; 200 electrode assemblies; 201 pole lugs; 300 circuit boards; 400 sample assemblies; 500 fixing pieces; 600 plastic parts; 700 connection parts; 707 an insulating substrate; 710 a first connection portion; 720 a second connection portion; 800 insulation member; 900 electrode columns; f presetting an axis.

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 specifically 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 "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, the battery cell includes a housing, and an electrode assembly and a sampling assembly accommodated in the housing, wherein the electrode assembly is electrically connected with the outside through an electrode column, and the sampling assembly is electrically connected with the outside through a connecting column. In the structure of the existing battery cell, the sampling assembly generally includes one or more connection posts, and when the number of the sampling assembly is plural, the number of the connection posts is increased. In order to facilitate the installation of the connection post, a plurality of installation holes are usually formed in the housing, so that the connection post is electrically connected with the outside through correspondingly installing the connection posts at the installation holes. On the one hand, the strength of the shell is reduced along with the increase of the number of the mounting holes, and the risk of structural strength failure of the battery cells is increased along with the increase of the number of the mounting holes; on the other hand, the sealing performance of the housing is also reduced with the increase of the number of the mounting holes; on the other hand, as the connecting column corresponding to each mounting hole needs to be mounted in the corresponding mounting hole, namely needs to be fixedly connected with the shell, the complexity of the battery cell process is increased along with the increase of the number of the mounting holes, and the cost is high.

Further, in the use process of the battery cell, particularly in the use process of the secondary battery, the secondary reaction exists after repeated charge and discharge cycles, gas can be continuously generated in the battery cell, or an electrode assembly in the shell generates an expansion phenomenon, so that certain air pressure exists in the shell, and the risk of failure of the structural strength of the battery cell can be further increased.

Based on the above considerations, the present application provides a battery cell, a battery and an electrical device. The battery unit comprises a shell, wherein 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 sampling assembly is accommodated in the shell; and a plurality of connecting parts in insulating connection are arranged in the mounting holes and are used for blocking the mounting holes, and the connecting parts are electrically connected with the sampling assembly. Therefore, a plurality of connecting parts for insulating connection of the mounting holes can be mounted and plugged through the same mounting hole on the shell, namely, the mounting of the plurality of connecting parts for insulating connection is realized through one mounting hole, so that the number of the mounting holes on the shell can be reduced, the risk of failure of the structural strength of the battery cell can be reduced, the sealing performance of the shell is improved, the process complexity of the battery cell is reduced, the cost is saved, and the compactness of the structure 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 the battery cell 1 that can be continuously used by activating the active material in a charging manner after the battery cell 1 is discharged. 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 charge and discharge of the battery cell 1, 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 electrode active material for the battery cell 1 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 1 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 post 900 to form a current loop.

According to some embodiments of the present application, as shown in fig. 3 to 8, the battery cell 1 according to the embodiment of the present application includes a housing 100, a sampling assembly 400, and a plurality of connecting portions 700 connected in an insulating manner. The housing 100 includes a wall portion 101, the wall portion 101 being provided with a mounting hole 102 communicating the inside and the outside of the housing 100; the sampling assembly 400 is housed inside the housing 100; a plurality of connecting portions 700 connected in an insulating manner are disposed in the mounting hole 102 and seal the mounting hole 102, and the plurality of connecting portions 700 are electrically connected to the sampling assembly 400.

Specifically, the plurality of connection portions 700 are integrated, and the mounting hole 102 is plugged directly or through an insulating member. The connection 700 extends along the axial direction of the mounting hole 102 to connect the sampling assembly 400 disposed inside the housing 100 and to enable electrical communication of the sampling assembly 400 with devices outside the housing 100.

The connection part 700 is a member or a structural part for realizing electrical connection, and the connection part 700 may include a conductive part such as a metal part.

The size, shape and number of the connection parts 700 may be set according to the size, electrical parameters and the like of the sampling assembly 400 and the battery cell 1.

Alternatively, the outer contour shape of the plurality of connection parts 700 of the insulation connection or the outer contour shape of the insulation member outside thereof is matched with the shape of the mounting hole 102, so that the mounting hole 102 is used for mounting and positioning the plurality of connection parts 700 of the insulation connection.

The sampling assembly 400 is used to acquire environmental information inside the housing 100, and generate an electrical signal based on the environmental information, which is transmitted to a device outside the housing 100 through the connection part 700.

In the above manner, the plurality of connection parts 700 for insulating connection blocking the mounting hole 102 can be mounted through the same mounting hole 102 on the housing 100, that is, the plurality of connection parts 700 for insulating connection can be mounted through one mounting hole 102, so that the number of mounting holes 102 on the housing can be reduced. On the one hand, the strength of the housing 100 is reduced with the increase of the number of the mounting holes 102, so that the strength of the housing 100 can be increased, and the risk of failure of the structural strength of the battery cell 1 is reduced; on the other hand, the sealing performance of the housing 100 is also reduced with an increase in the number of the mounting holes 102, so that the above-described structure is also capable of improving the sealing performance of the housing 100; on the other hand, since the connecting post corresponding to each mounting hole needs to be mounted at the corresponding mounting hole, that is, needs to be fixedly connected with the housing, the complexity of the process of the battery cell 1 is increased along with the increase of the number of the mounting holes 102, for example, the step surface needs to be machined on the housing 100 for each mounting hole 102, which is high in cost, therefore, the structure can also reduce the process complexity of the battery cell 1 and save the cost. Further, the plurality of connecting portions 700 connected in an insulating manner are integrally provided in the same mounting hole 102, so that the occupied area of the mounting hole 102 on the housing can be reduced, and the compactness of the structure can be improved, as compared with the case where no connecting portion 700 is provided with an independent mounting hole 102.

Of course, the battery cell 1 further includes an electrode assembly 200, and the electrode assembly 200 is accommodated inside the case 100, and the detailed description will be referred to above.

In some embodiments, the plurality of connection parts 700 includes a first connection part 710 disposed along the preset axis F and a second connection part 720 surrounding at least a portion of the outer circumference of the first connection part 710 in the circumferential direction of the first connection part 710.

Specifically, the arrangement along the preset axis F refers to extending along the preset axis F, that is, the axis of the first connecting portion 710 coincides with or is parallel to the preset axis F, and the preset axis F passes through the first connecting portion 710; the preset axis F is an axis of a connection body formed by integrating the plurality of connection parts 700, and the connection body may be provided in a column shape or the like. When the connection portion 700 is disposed perpendicularly to the wall portion 101, the preset axis F may be the axis of the mounting hole 102. The circumferential direction of the preset axis F refers to a direction perpendicular to the preset axis F and surrounding the preset axis F.

By arranging the first connection portion 710 along the preset axis F, the occupied area of the plurality of connection portions 700 connected in an insulating manner on the wall portion 101 can be reduced, so that the opening area of the mounting hole 102 can be reduced, and the strength and sealing performance of the wall portion 101 can be improved; the second connection portion 720 is disposed around at least a portion of the outer periphery of the first connection portion 710, so that the arrangement area between the second connection portion 720 and the first connection portion 710 can be reduced, the opening area of the mounting hole 102 can be further reduced, and the strength and sealing performance of the wall portion 101 can be further improved; and the compactness of the structure can be improved.

The number of the second connection parts may be set according to the structural requirement and performance requirement of the sampling assembly 400 inside the housing 100, and the specific position and size of the second connection parts may be set according to the structural requirement and performance requirement of the sampling assembly 400, the open area of the mounting hole 102, and the like.

In some embodiments, the second connection portion 720 is closed around the outer circumference of the first connection portion 710.

The second connecting portion 720 is closed and surrounds the outer periphery of the first connecting portion 710, and the second connecting portion 720 is sleeved on the outer periphery of the first connecting portion 710, so that the occupied area of the second connecting portion 720 and the first connecting portion 710 on the wall portion 101 can be further reduced, the opening area of the mounting hole 102 can be reduced, and further the strength and the sealing performance of the wall portion 101 can be improved; and the compactness of the structure can be improved. And the size of the second connection part 720 is increased to improve the electrical performance.

In some embodiments, as shown in fig. 9, the number of the second connection parts 720 is at least two, and at least two second connection parts 720 are disposed at intervals along the circumferential direction of the first connection part 710.

In this way, at least three connection portions 700 can be implemented, and the second connection portion 720 is disposed around at least a portion of the outer periphery of the first connection portion 710, so that the arrangement area between the second connection portion 720 and the first connection portion 710 can be reduced, and thus the opening area of the mounting hole 102 can be further reduced, and further the strength and sealing performance of the wall portion 101 can be further improved, and the compactness of the structure can be improved.

For example, the first connection portion 710 is disposed on the preset axis F, and the two second connection portions 720 are disposed at intervals along the circumferential direction of the first connection portion 710.

The embodiment of the present application does not limit whether the sizes and arrangement of the plurality of second connection parts 720 are uniform.

In other embodiments, the second connection portion may be three or more, and may be located at the same circumference of the first connection portion, or at a plurality of different circumferences of the first connection portion.

The plurality of second connecting parts are located on the same periphery, which means that the distances from the plurality of second connecting parts to the first connecting part are equal.

In some embodiments, as shown in fig. 10, the connection part 700 is partially disposed around the preset axis F, and the plurality of connection parts 700 are spaced apart from each other in a circumferential direction of the preset axis F.

The connection part 700 is partially arranged around the preset axis F, and the plurality of connection parts 700 are spaced from each other along the circumferential direction of the preset axis F, so that the plurality of connection parts 700 are positioned on the same periphery outside the preset axis F, the occupied area of the plurality of connection parts 700 on the wall part 101 can be reduced, the opening area of the mounting hole 702 can be reduced, the strength and the sealing performance of the housing 100 can be improved, and the compactness of the structure can be improved.

In other embodiments, the plurality of circumferentially disposed connection portions may be located on the same circumference, may be located on the circumferences of different circles, or may be located partially on the same circumference.

In some embodiments, as shown in fig. 3 to 10, the battery cell 1 further includes: the insulator 800, the insulator 800 is disposed between the plurality of connection parts 700.

The insulating member 800 is disposed between the adjacently disposed connection parts 700 to improve interference between the plurality of connection parts 700, such as electric signal interference, etc., to improve the reliability of the battery cell 1.

The insulator 800 may include a plastic member or the like. The plastic material is convenient for molding the plastic part. Or the insulator 800 may include an insulator such as ceramic or the like that dissipates heat better.

In some embodiments, the connection 700 is integrally injection molded with the insulator 800. In this way, the connection stability between the connection part 700 and the insulating member 800 can be improved, thereby improving the reliability of the battery cell 1, and the mounting process between the connection part 700 and the insulating member 800 can be simplified, further reducing the process complexity of the battery cell 1.

In some embodiments, as shown in fig. 3 to 8, the battery cell 1 further includes a fixing member 500, the connection part 700 is fixed to the fixing member 500, and the fixing member 500 fixes the connection wall part 101.

The fixing member 500 enables the connection between the connection portion 700 and the wall portion 101, so that stability between the connection portion 700 and the wall portion 101 can be improved, and damage to the connection portion 700 due to an installation process can be reduced.

In some embodiments, the securing member 500 is secured around the outer circumference of the connecting portion 700 at least partially along the circumference of the connecting portion 700.

Setting the fixing member 500 at the outer periphery of the connection portion 700 can facilitate setting the fixing member 500 between the inner wall of the mounting hole 102 and the connection portion 700, so that the fixing member 500 is located in the mounting hole 102, not only can the connection stability between the inner wall of the mounting hole 102 and the connection portion 700 be increased, but also the interference of the fixing member 500 to the inside or outside structure of the housing 100 can be reduced.

Alternatively, the fixing member 500 may be a metal bracket provided with a mounting hole in which the connection part 700 is mounted, and the metal bracket is used as the fixing member 500 of the connection part 700 to be connected with the wall part 101, so that the connection stability can be improved, because the metal bracket can be connected with the wall part 101 in a connection manner with good stability, such as welding, riveting, etc., thereby improving the reliability of the battery cell 1.

Another insulating member may be further disposed on the inner wall of the mounting hole 102 to realize insulation between the metal bracket and the connection part 700, thereby improving the reliability of the battery cell 1.

In some embodiments, as shown in fig. 9, the battery unit 1 further includes an insulating substrate 707, where the insulating substrate 707 covers a side of the metal support facing away from the interior of the housing 100, the insulating substrate 707 is provided with another mounting hole corresponding to and communicating with the mounting hole 102, and the connection part 700 is embedded in the corresponding mounting hole 102 and the mounting hole on the insulating substrate 707. On one hand, the strength of the metal bracket can be increased; on the other hand, the insulating substrate 707 has an electrical, hydraulic, or other insulating function and a buffer function for the metal frame, so that damage or interference to the metal frame can be reduced.

The insulating substrate 707 may include a plastic substrate or the like. The plastic material is convenient for molding the plastic substrate. Or the insulating substrate 707 may include an insulating substrate such as a ceramic substrate that dissipates heat better.

In some embodiments, the metal bracket is welded to the wall 101. The welding process can form a molten mass, and the molten mass can be connected with the metal bracket and the wall part 101 after solidification, so that the stability between the metal bracket and the wall part 101 can be improved, and the reliability of the battery cell 1 can be further improved.

In some embodiments, as shown in fig. 9, the mounting hole 102 includes a first hole section 142 and a second hole section 122 that communicate with each other, the first hole section 142 communicates with the outside of the housing 100, the second hole section 122 communicates with the inside of the housing 100, the first hole section 142 and the second hole section 122 form a stepped surface 132 toward the outside of the housing at the junction of the two, and the fixing member 500 is supported on the stepped surface 132.

The step surface 132 can limit the movement of the fixing member 500 toward the interior of the housing 100, and the first hole section 142 and the second hole section 122 can limit the movement range of the fixing member 500 along the radial direction of the mounting hole 102, which is beneficial to mounting the fixing member 500 and also beneficial to keeping the fixing member 500 stable in structure after the fixing member 500 is mounted.

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.

In some embodiments, the mount 500 includes: the fixed section and the inserting section are arranged along the direction of the preset axis F, the inserting section is arranged in the second hole section 122, and the fixed section is arranged in the first hole section 142 and is supported on the step surface 132.

The stepped surface 132 may limit movement of the fixing segment toward the inside of the housing 100, the second hole segment 122 may limit the range of movement of the fixing segment in the radial direction of the mounting hole 102, and the first hole segment 142 may limit the range of movement of the insert segment in the radial direction of the mounting hole 102, thereby facilitating installation of the fixing member 500.

Alternatively, the fixing section and the wall portion 101 may be connected by welding.

In some embodiments, the battery cell 1 further comprises: the sealing ring 152 is disposed between the fixing section and the step surface 132, so as to improve the sealing performance between the fixing section and the step surface 132, thereby improving the reliability of the battery cell 1.

In some embodiments, the connection 700 may include a plurality of signal portions that are electrically connected with the sampling assembly 400.

In some embodiments, the connection part 700 may also include two power supply parts and at least one signal part, and the battery cell 1 includes two electrode columns 900, where the two electrode columns 900 are disposed on the wall part 101 and extend to the outside of the housing 100; the two power supply parts are electrically connected with the two electrode posts 900 outside the housing 100, respectively, to supply power to the sampling assembly 400.

The connecting part 700 is arranged outside the shell 100 and the electrode column 900, and the connecting part is used for supplying power to the sampling assembly 400 in the shell 100, so that the power supply circuit structure in the shell 100 can be reduced, and the maintenance and the improvement of the safety of the battery cell 1 are facilitated.

In some embodiments, as shown in fig. 3, 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 covers the open end 111, and the sampling assembly 400 and the electrode assembly 200 are accommodated inside the case 110. The end cap 120 forms the wall 101. The mounting hole 102 is formed in the end cap 120.

The open end 111 may be provided with the opening 112. By opening the mounting hole 102 in the end cap 120, the mounting hole 102 is advantageously plugged.

Alternatively, the sampling assembly 400 may be disposed inside the end cap 120 to facilitate installation of the sampling assembly 400 and collection of the environment inside the housing 100.

Alternatively, the sampling assembly 400 may be attached to the inside of the end cap 120 by injection molding or adhesive, or the like, or with other components within the housing 100 to facilitate routing of the sampling assembly 400.

The end cap 120 may serve to position the two electrode columns 900. The electrode column 900 may be fixed relative to the end cap 120.

Specifically, one end of the electrode post 900 is disposed toward the inside of the case 100 and may 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 may be connected to the outside and the circuit board 300, so that the electrode assembly 200 may supply power to the outside and the circuit board 300 through the electrode post 900, respectively.

Further, the electrode assembly 200 may be charged through the electrode column 900.

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 connection part 700 can be increased.

In some embodiments, sampling assembly 400 includes a plurality of sampling modules, each sampling module coupled to at least one connection 700.

The sampling module is used 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. The sampling module can be used for acquiring environmental information inside the casing 100, such as sampling gas, temperature or air pressure inside the casing 100, so as to improve the effectiveness of managing the working state of the battery cell 1, and further improve the working stability of the battery cell 1.

The number of the connection parts 700 to which the sampling module is connected may be set according to the type and the structural requirement of the sampling module.

In some embodiments, the sampling assembly 400 may include a sampling module provided with a plurality of signal terminals that may be electrically connected with the plurality of connection parts 700, respectively; or the sampling assembly 400 includes a plurality of sampling modules, each of which may be provided with a single or a plurality of signal terminals to be connected with a single or a plurality of connection parts 700.

In some embodiments, the sampling assembly 400 may include one or more of a gas pressure sampling module, a gas sampling module, or a temperature sampling module.

The air pressure sampling module 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. The air pressure inside the casing 100 can be detected by the air pressure sampling module, which is beneficial to managing the working state of the battery cell 1.

The temperature sampling module 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. The temperature inside the housing 100 is detected by the temperature sampling module, which is advantageous for managing the operating state of the battery cell 1.

The gas sampling module can be used to detect the gas type in the housing 100, which is beneficial to managing the operation state of the battery cell 1.

Alternatively, the sampling module may be disposed in a package, and the package is connected to the end cap 120, so as to improve the reliability of the sampling module.

The packaging shell can protect the sampling module. The package can reduce damage to the sampling module by factors outside the case 100 on the one hand, and can block between the sampling module and the electrode assembly 200 and electrolyte on the other hand, so that corrosion of the sampling module by the electrolyte inside the case 100 and the electrode assembly 200 is reduced, and the risk of short circuit caused by direct contact of the sampling module and the electrode assembly 200 is reduced.

Alternatively, the package can be welded to the end cap 120.

In some embodiments, as shown in fig. 3 and 5, the battery cell 1 further includes a plastic member 600 disposed between the electrode assembly 200 and the wall portion 101.

The plastic part 600 is made of plastic material, and the plastic material is convenient for molding 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.

In some embodiments, as shown in fig. 11, the battery cell 1 further includes a circuit board 300, and the circuit board 300 is disposed outside the housing 100 and electrically connected with the connection part 700.

The processing of the environmental information acquired by the sampling assembly 400 is performed through the circuit board 300 disposed outside the housing 100 and electrically connected to the connection part 700 to determine the gas composition and concentration, temperature or gas pressure inside the housing 100, thereby analyzing the operating state of the battery cell 1.

In some embodiments, the circuit board 300 is disposed on a side of the wall portion 101 facing away from the sampling assembly 400, i.e., a side of the wall portion 101 facing away from the interior of the housing 100.

The mounting and dismounting of the circuit board 300 is facilitated by the circuit board 300 being arranged on the side of the wall portion 101 facing away from the sampling assembly 400, i.e. outside the housing 100. The wall portion 101 may prevent the circuit board 300 from contacting the electrode assembly 200 and the electrolyte, reduce the risk of the circuit board 300 being shorted by contact with the electrode assembly 200, and reduce corrosion of the circuit board 300 by the electrode assembly 200 and the electrolyte.

In some embodiments, the battery cell 1 further includes a processor, and the processor is disposed on the circuit board 300 and electrically connected to the connection part 700.

The processor can process the environmental information sampled by the sampling assembly 400, so that the battery cell 1 can be intelligentized. For example, the processor may determine the gas composition and concentration, temperature or pressure inside the housing 100 according to the environmental information acquired by the sampling assembly 400, so as to analyze the operation state of the battery cell 1.

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

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

The space of the side of the circuit board 300 facing away from the interior of the housing 100 is relatively spacious, and the processor can be arranged on the side of the circuit board 300 facing away from the interior of the housing 100, which is beneficial to heat dissipation of the processor.

In some embodiments, as shown in fig. 3 to 8, the battery cell 1 includes a housing 100, a sampling assembly 400, and a plurality of connection parts 700 connected in an insulating manner. The housing 100 includes an end cap 120, and the end cap 120 is provided with a mounting hole 102 for communicating the inside and the outside of the housing 100; the sampling assembly 400 is housed inside the housing 100; a plurality of connecting portions 700 connected in an insulating manner are disposed in the mounting hole 102 and seal the mounting hole 102, and the plurality of connecting portions 700 are electrically connected to the sampling assembly 400.

The plurality of connection portions 700 include a first connection portion 710 disposed along the preset axis F and a second connection portion 720 surrounding at least a portion of the outer circumference of the first connection portion 710 along the circumferential direction of the first connection portion 710, wherein the second connection portion 720 is closed around the outer circumference of the first connection portion 710.

Further, the battery cell 1 further includes: insulator 800, fixture 500, insulating substrate 707, and seal ring 152; wherein the insulator 800 is disposed between the plurality of connection parts 700. The connection part 700 is fixed to the fixing member 500, and the fixing member 500 is fixedly connected to the end cap 120. The insulating substrate 707 covers one side of the fixing member 500 facing away from the interior of the housing 100, the insulating substrate 707 is provided with another mounting hole corresponding to and communicating with the mounting hole 102, and the connection portion 700 is embedded in the corresponding mounting hole 102 and the mounting hole on the insulating substrate 707. A seal 152 is disposed between the fixed segment and the step surface 132. The battery cell 1 further includes a plastic member 600 positioned between the electrode assembly 200 and the wall portion 101.

Wherein, the mounting hole 102 includes a first hole section 142 and a second hole section 122 that are communicated with each other, the first hole section 142 is communicated with the outside of the housing 100, the second hole section 122 is communicated with the inside of the housing 100, the first hole section 142 and the second hole section 122 form a step surface 132 facing the outside of the housing at the joint of the two, and the fixing member 500 is supported on the step surface 132. The fixing member 500 includes a fixing section and an inserting section disposed along the direction of the preset axis F, the inserting section is disposed in the second hole section 122, and the fixing section is disposed in the first hole section 142 and supported on the step surface 132.

In other embodiments, the plurality of connection portions may also be provided in a circumferentially extending splice around the preset axis F; or one connecting part is arranged along a preset axis F, and the other connecting parts are spliced around the periphery of the connecting part in an extending way; the plurality of connection portions may be arranged in one turn of the outer circumference or in a plurality of turns of the outer circumference stacked in the radial direction.

In some embodiments, as shown in fig. 2, battery 100a includes cell 1 described above. By the arrangement, the number of the holes on the shell of the battery monomer can be reduced, so that the strength of the battery monomer is improved, the risk of failure of the structural strength of the battery monomer is reduced, the process can be simplified, and the cost is saved; further, the occupied space of the opening can be reduced, and the compactness of the structure is improved.

In some embodiments, battery 100a further includes a battery management unit electrically connected to connection 700. The battery management unit is electrically connected to the connection part 700, so that the battery management unit automatically manages the battery cell 1 according to the environmental information obtained by the sampling assembly 400, for example, processes the environmental information obtained by the sampling assembly 400 to determine the gas composition and concentration, temperature or air pressure inside the housing 100, thereby analyzing the working state of the battery cell 1.

In some embodiments, the battery 100a further includes a case 10a and a circuit board 300, and the battery cell 1 is disposed in the case 10 a; the circuit board 300 is disposed outside the case 10a and electrically connected to the connection part 700.

The processing of the environmental information acquired by the sampling assembly 400 is realized through the circuit board 300 which is disposed in the case 10a and electrically connected to the connection part 700, so as to determine the gas composition and concentration, temperature or air pressure inside the housing 100, thereby analyzing the operating state of the battery cell 1.

By disposing the circuit board 300 on the side of the case 10a facing away from the inside of the housing 100, the mounting and dismounting of the circuit board 300 are facilitated. The case 10a may prevent the circuit board 300 from contacting the electrode assembly 200 and the electrolyte, reduce the risk of the circuit board 300 being shorted by contact with the battery cell 1, and reduce interference of the battery cell 1 to the circuit board 300.

In some embodiments, as shown in fig. 1, the powered device includes the battery 100a described above. By the arrangement, the number of the holes on the shell of the battery monomer can be reduced, so that the strength of the battery monomer is improved, the risk of failure of the structural strength of the battery monomer is reduced, the process can be simplified, and the cost is saved; further, the occupied space of the opening can be reduced, and the compactness of the structure is improved.

In summary, in the embodiment of the present application, the plurality of connection portions for insulating connection for plugging the mounting hole may be mounted through the same mounting hole on the housing, that is, the plurality of connection portions for insulating connection may be mounted through one mounting hole, so that the number of mounting holes on the housing may be reduced. On the one hand, the strength of the shell can be reduced along with the increase of the number of the mounting holes, so that the structure can increase the strength of the shell and reduce the risk of failure of the structural strength of the battery cell; on the other hand, the sealing performance of the shell is also reduced along with the increase of the number of the mounting holes, so that the structure can also improve the sealing performance of the shell; on the other hand, as the connecting post corresponding to each mounting hole needs to be mounted at the corresponding mounting hole, i.e. needs to be fixedly connected with the housing, the complexity of the battery cell process is increased along with the increase of the number of the mounting holes, for example, the step surface needs to be processed for each mounting hole on the housing, and the cost is high, therefore, the structure can also reduce the process complexity of the battery cell and save the cost. Further, a plurality of connecting portions connected in an insulating manner are integrally arranged in the same mounting hole, and compared with the case that no connecting portion is provided with an independent mounting hole, the mounting hole can be reduced in occupied area on the shell, and further the compactness of the structure can be improved.

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 at least:

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;

a sampling assembly housed inside the housing;

and the plurality of connecting parts are in insulating connection and are arranged in the mounting hole and are used for blocking the mounting hole, and the plurality of connecting parts are electrically connected with the sampling assembly.

2. The battery cell of claim 1, wherein the plurality of connection portions includes a first connection portion disposed along a predetermined axis and a second connection portion circumferentially surrounding at least a portion of an outer circumference of the first connection portion along a circumference of the first connection portion.

3. The battery cell of claim 2, wherein the second connection portion is closed around the outer periphery of the first connection portion.

4. The battery cell according to claim 2, wherein the number of the second connection parts is at least two, and at least two of the second connection parts are disposed at intervals along the circumferential direction of the first connection part.

5. The battery cell of claim 1, wherein the connection portion is disposed partially around a predetermined axis, and the plurality of connection portions are spaced apart from each other along a circumference of the predetermined axis.

6. The battery cell of any one of claims 1 to 5, further comprising:

and the insulating piece is arranged among the plurality of connecting parts.

7. The battery cell of any one of claims 1 to 5, further comprising a securing member to which the connecting portion is secured, the securing member fixedly connecting the wall portion.

8. The battery cell as recited in claim 7, wherein the securing member is secured around the outer periphery of the connecting portion at least partially along the circumference of the connecting portion.

9. The battery cell of claim 7, wherein the mounting hole includes a first hole section and a second hole section in communication with each other, the first hole section in communication with the exterior of the housing, the second hole section in communication with the interior of the housing, the first hole section and the second hole section forming a stepped surface at a junction of the two toward the exterior of the housing, the fixture supported on the stepped surface.

10. The battery cell of claim 9, wherein the mount comprises: the fixed section and the inserting section are arranged along the preset axis direction, the inserting section is arranged in the second hole section, and the fixed section is arranged in the first hole section and is supported on the step surface.

11. The battery cell of claim 10, wherein the battery cell further comprises:

the sealing ring is arranged between the fixed section and the step surface.

12. The battery cell of claim 1, wherein the housing comprises a shell and an end cap, the shell being provided with an open end, the end cap being capped at the open end, the sampling assembly being housed within the shell; the end cap forming the wall portion; the mounting hole is formed in the end cover.

13. The battery cell of claim 1, wherein the sampling assembly comprises a plurality of sampling modules, each sampling module coupled to at least one of the connections.

14. The battery cell of claim 1, wherein the battery cell further comprises:

and the circuit board is arranged outside the shell and is electrically connected with the connecting part.

15. The battery cell of claim 14, wherein the circuit board is disposed on a side of the wall portion facing away from the sampling assembly.

16. A battery comprising a cell according to any one of claims 1 to 15.

17. The battery of claim 16, wherein the battery further comprises:

and the battery management unit is electrically connected with the connecting part.

18. The battery of claim 16, wherein the battery further comprises:

the battery monomer is arranged in the box body;

the circuit board is arranged outside the box body and is electrically connected with the connecting part.

19. An electrical device comprising a battery as claimed in any one of claims 16 to 18.