CN116137357B

CN116137357B - Shell, battery monomer, battery and power consumption device

Info

Publication number: CN116137357B
Application number: CN202111363707.5A
Authority: CN
Inventors: 蒙万秋; 刘倩; 叶永煌; 刘彦宇; 薛龙飞; 张小细; 郑于炼
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2025-02-18
Anticipated expiration: 2041-11-17
Also published as: CN116137357A

Abstract

The application provides a shell, a battery monomer, a battery and an electricity utilization device, and belongs to the technical field of batteries. Wherein the housing includes a first wall, a second wall, and a first insulating member. The second wall surrounds the first wall, one end of the second wall in the preset direction is connected with the first wall, the other end of the second wall in the preset direction forms an opening, and the second wall and the first wall jointly define an accommodating space for accommodating the electrode assembly. The first insulating member is disposed in the receiving space, the first insulating member is thermally compounded with the first wall, and the first insulating member is used to separate the first wall and the electrode assembly. The shell adopting the structure can improve the bonding strength of the first insulating piece and the first wall, thereby being beneficial to reducing the risk that the first insulating piece and the first wall fall off or generate gaps, playing a better role in protecting the shell, being beneficial to improving the anti-corrosion capability and the anti-leakage capability of the shell, and further being capable of improving the service life of the battery monomers.

Description

Shell, battery monomer, battery and power consumption device

Technical Field

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

Background

The lithium ion battery has the outstanding advantages of high energy density, small environmental pollution, high power density, long service life, wide application range, small self-discharge coefficient and the like, is one of the most widely applied batteries in the world nowadays, and is also an important component of new energy development. With the continuous development of lithium ion battery technology, higher requirements are also put on the performance and service life of lithium ion batteries. The battery cell of the lithium ion battery is obtained by assembling an electrode assembly by a positive electrode plate, a negative electrode plate and a separation film in a winding or lamination mode, then filling the electrode assembly into a shell, then injecting electrolyte, and finally covering an end cover. In the production process of the battery cell, the insulating film needs to be wrapped outside the electrode assembly, and the bottom supporting plate is arranged at the bottom of the shell, so that the electrical isolation between the electrode assembly and the shell is realized, but the battery cell adopting the structure has poor performance and short service life.

Disclosure of Invention

The embodiment of the application provides a shell, a battery cell, a battery and an electricity utilization device, which can effectively improve the performance and service life of the battery cell.

In a first aspect, an embodiment of the present application provides a case for accommodating an electrode assembly, the case including a first wall, a second wall and a first insulating member, the second wall being disposed around the first wall, one end of the second wall in a predetermined direction being connected to the first wall, the other end of the second wall in the predetermined direction forming an opening, the second wall and the first wall together defining an accommodating space for accommodating the electrode assembly, the first insulating member being disposed in the accommodating space, the first insulating member being thermally compounded with the first wall, the first insulating member being for separating the first wall and the electrode assembly.

In the above technical scheme, be provided with the first insulating part that is used for separating electrode assembly and first wall in the accommodation space of casing, through with first insulating part thermal composition on first wall can effectively promote the joint strength between first insulating part and the first wall, thereby when the phenomenon of vibration appears in the single use of battery or when the phenomenon that the gas produced in single inside of battery causes the casing to appear expanding, can reduce the risk that drops or produce the clearance between first insulating part and the first wall, the casing that adopts this kind of structure can realize the insulating isolation of electrode assembly and the first wall of casing on the one hand, in order to replace and set up the bottom support plate that is used for keeping apart casing and electrode assembly in the casing, receive the blocking of bottom support plate and cause the not good phenomenon of electrode assembly infiltration when electrolyte backward flow in the casing, and then be favorable to improving the performance of the single battery that has this kind of casing, on the other hand can play certain guard action to the casing, effectively reduce the granule and the powder that the electrode assembly dropped and the first wall direct contact of electrolyte and casing, thereby be favorable to improving the anticorrosive ability and leak protection ability and the battery of casing, and further can improve single life. In addition, in the production process of the battery cell, the process of installing the bottom support plate at the bottom of the electrode assembly is omitted, and the first insulating part can be thermally compounded on the first wall of the shell in the production branch line of the shell to complete the covering process of the first insulating part, so that the shell can be subjected to parallel line production with the battery cell, that is, when the shell enters the production assembly line of the battery cell, the covering process of the first insulating part is completed, so that the covering process of the first insulating part does not occupy the production takt of the battery cell, and further the production efficiency of the battery cell is improved.

In some embodiments, the junction of the first wall and the second wall is formed with a chamfer, and the thickness of the first insulator is greater than the height of the chamfer in the predetermined direction.

In the above technical scheme, through setting up the thickness of first insulating part in being greater than the chamfer in the ascending height of predetermineeing for can effectively reduce the phenomenon that the electrode assembly bumps with the chamfer of casing when the electrode assembly assembles in the accommodation space of casing, and can reduce the phenomenon that the electrode assembly receives the chamfer extrusion or the impact of casing in the use, thereby be favorable to reducing the risk that the electrode assembly appears warping or damaged in the use or assembly.

In some embodiments, the thickness of the first insulator is 0.1-0.8mm.

In the above technical scheme, through setting the thickness of first insulating part between 0.1mm to 0.8mm, on the one hand can reduce the phenomenon that the insulating effect of first insulating part is relatively poor and life is shorter because of the thickness of first insulating part is too little to guarantee insulating effect and the use reliability of first insulating part, on the other hand can alleviate and cause the influence to the capacity of the accommodation space of casing because of the thickness of first insulating part is too big, in order to guarantee the energy density of the battery monomer that has this kind of casing.

In some embodiments, the first insulating member has a plurality of first apertures for allowing at least a portion of the gas to pass therethrough and preventing the passage of electrolyte, and the first wall has a first vent opening therethrough for allowing at least a portion of the gas to pass therethrough.

In the above technical scheme, the first insulating part has a plurality of first holes, and first hole can allow partial gas to pass through and can prevent electrolyte to pass through, through seting up first air vent on first wall for the gas in the accommodation space of casing can pass through behind the first insulating part through the outside of first air vent row to the casing, thereby can alleviate the phenomenon that the battery monomer that has this kind of casing appears expanding gas or bloating, and then is favorable to improving battery monomer's safety in utilization and life.

In some embodiments, the first pores have a pore size of 0.4-189nm.

In the above technical solution, by setting the pore diameter of the first pore to be between 0.4nm and 189nm so that the pore diameter of the first pore is larger than the diameter of a part of gas molecules and smaller than the diameter of liquid molecules of the electrolyte, it is achieved that the first insulating member can allow a part of gas to pass through but can prevent the electrolyte from passing through.

In some embodiments, the first wall is formed with a first nano-coating to which the first insulator is thermally compounded.

In the technical scheme, the first nano-plating layer is formed on the first wall, and the first insulating piece is thermally compounded on the first nano-plating layer of the first wall, so that the bonding strength between the first insulating piece and the first wall can be further improved, the risk that the first insulating piece falls off is reduced, and the reliability of the shell in the use process is further improved.

In some embodiments, the material of the first insulating member has a polar group.

In the technical scheme, the first insulating piece made of the material with the polar groups is adopted, that is to say, the polar groups are arranged in the first insulating piece, and the combination firmness of the first insulating piece and the first wall of the shell can be effectively improved through the polar groups, so that the bonding strength between the first insulating piece and the first wall is further improved.

In some embodiments, the case further includes a second insulating member disposed in the receiving space along a circumferential direction of the second wall, the second insulating member being thermally compounded with the second wall, the second insulating member being for separating the second wall and the electrode assembly.

In the above technical scheme, the second insulating part for separating the electrode assembly and the second wall is further arranged in the accommodating space of the shell, and the bonding strength of the second insulating part and the second wall can be improved by thermally compounding the second insulating part on the second wall, so that when the phenomenon of vibration occurs in the use process of the battery monomer or when the phenomenon of expansion occurs in the shell due to gas generated in the battery monomer, the risk of falling off or generating gaps between the second insulating part and the second wall can be reduced, the shell adopting the structure can realize the insulation and isolation of the electrode assembly and the second wall of the shell on one hand, so as to replace the insulating film used for isolating the shell and the electrode assembly in the shell, thereby reducing the phenomenon that electrolyte is free between the second wall and the insulating film, and being blocked by the insulating film when the electrolyte in the shell is released, further being favorable for improving the performance of the battery monomer with the shell, on the other hand, being capable of playing a certain protection role in directly contacting the second wall of the shell, effectively reducing the electrolyte and the corrosion resistance of the shell, and further improving the service life of the battery monomer with the shell. In addition, in the single production process of battery, the process of setting up the insulating film at the periphery side of electrode assembly has been cancelled, the second insulator can accomplish the second insulator thermal composition in the production branch line of casing on the second wall of casing, with the cover process of accomplishing the second insulator, make the casing can carry out the production of combining the line with single battery, that is to say, when the casing got into single production assembly line of battery, the cover process of second insulator has been accomplished, thereby make the cover process of second insulator can not occupy single production beat of battery, and then be favorable to improving single production efficiency of battery.

In some embodiments, the distance between the edge of the second insulator adjacent to the opening and the opening in the predetermined direction is 1-8mm.

In the above technical scheme, the edge of the second insulating part close to the opening of the shell is arranged at intervals with the opening, that is, a certain distance exists between the edge of the second insulating part close to the opening of the shell and the opening, so that the influence and interference of the second insulating part on the end cover of the battery cell when the end cover is covered at the opening of the shell are reduced, and the connection reliability of the end cover and the shell can be ensured.

In some embodiments, the thickness of the second insulator is 0.03-0.5mm.

In the above technical scheme, through setting the thickness of second insulating part between 0.03mm to 0.5mm, on the one hand can reduce the phenomenon that the insulating effect of second insulating part is relatively poor and life is shorter because of the thickness of second insulating part is too little to guarantee the insulating effect and the use reliability of second insulating part, on the other hand can alleviate and cause the influence to the capacity of the accommodation space of casing because of the thickness of second insulating part is too big, in order to guarantee the energy density of the battery monomer that has this kind of casing.

In some embodiments, the second insulator has a plurality of second apertures for allowing at least a portion of the gas to pass therethrough and preventing the passage of electrolyte, and the second wall has a second vent opening therethrough for allowing at least a portion of the gas to pass therethrough.

In the above technical scheme, the second insulating part has a plurality of second holes, and the second hole can allow partial gas to pass through and can prevent electrolyte to pass through, through seting up the second vent on the second wall for the gas in the accommodation space of casing can pass through the second insulating part after the outside of casing is arranged to the second vent, thereby can alleviate the phenomenon that the battery monomer that has this kind of casing appears expanding gas or bloating, and then is favorable to improving battery monomer's safety in utilization and life.

In some embodiments, the second pores have a pore size of 0.4-189nm.

In the above technical solution, by setting the pore diameter of the second pore to be between 0.4nm and 189nm so that the pore diameter of the second pore is larger than the diameter of a part of gas molecules and smaller than the diameter of liquid molecules of the electrolyte, it is achieved that the second insulator can allow a part of gas to pass through but can prevent the electrolyte from passing through.

In some embodiments, the first insulator overlaps and thermally composites the first and second ends of the second wall in the circumferential direction to form an overlapping region.

In the technical scheme, the second insulating part is paved on the second wall along the circumferential direction of the second wall, and the head end and the tail end of the second insulating part in the circumferential direction of the second wall are mutually overlapped and then are in thermal composite connection, so that the connecting strength of the head end and the tail end of the second insulating part can be improved, the risk of gaps of the second insulating part can be relieved, the phenomenon that electrolyte in the shell enters between the second insulating part and the second wall through the gaps of the second insulating part is reduced, and the protection effect of the second insulating part on the shell is improved.

In some embodiments, the second wall comprises a plurality of walls connected end to end in sequence along the circumference thereof, the junction of each adjacent two walls forming a corner region, and the overlapping region is arranged corresponding to the corner region.

In the above technical scheme, because the electrode assembly in the casing can not be completely attached to the corner region of the second wall, a gap exists between the electrode assembly and the corner region of the second wall, and the overlapping region is a region protruding out of the second wall after the head end and the tail end of the second insulating piece are mutually overlapped, so that the overlapping region of the second insulating piece is correspondingly arranged in the corner region of the second wall, on one hand, the phenomenon that the electrode assembly collides with the overlapping region can be reduced, and on the other hand, the influence of the overlapping region on the capacity of the electrode assembly in the accommodating space can be effectively reduced.

In some embodiments, the second wall is formed with a second nano-plating layer to which the second insulator is thermally compounded.

In the technical scheme, the second nano-plating layer is formed on the second wall, and the second insulating part is thermally compounded on the second nano-plating layer of the second wall, so that the bonding strength between the second insulating part and the second wall can be further improved, the risk that the second insulating part falls off is reduced, and the reliability of the shell in the use process is further improved.

In some embodiments, the second nano-plating layer is an annular structure extending along a circumferential direction of the second wall, and in the preset direction, the second nano-plating layer extends from an edge of the second insulating member near the opening to a direction facing the first wall.

In the technical scheme, the second nano-coating is arranged to be of the annular structure extending along the circumferential direction of the second wall, and extends from the edge of the second insulating piece to the direction facing the first wall along the preset direction, so that the second nano-coating is formed in the region where the edge of the second insulating piece and the second wall are subjected to thermal recombination, the bonding strength between the edge of the second insulating piece and the second wall can be improved, and the phenomenon that electrolyte permeates between the second insulating piece and the second wall from the edge of the second insulating piece can be effectively relieved.

In some embodiments, the material of the second insulating member has a polar group.

In the technical scheme, the second insulating piece made of the material with the polar group is adopted, that is to say, the polar group is arranged in the second insulating piece, and the bonding firmness of the second insulating piece and the second wall of the shell can be effectively improved through the polar group, so that the bonding strength between the second insulating piece and the second wall is further improved.

In some embodiments, the first insulating member and the second insulating member are thermally compositely connected at an end of the predetermined direction away from the opening.

In the technical scheme, through the thermal composite connection of one end of the first insulating piece and one end of the second insulating piece, on one hand, the connection strength between the first insulating piece and the second insulating piece can be improved, and on the other hand, the phenomenon that a gap appears between the first insulating piece and the second insulating piece can be reduced, so that the risk of infiltration of electrolyte from the gap between the first insulating piece and the second insulating piece is reduced.

In a second aspect, an embodiment of the present application further provides a battery unit, including an electrode assembly, an end cap, and the foregoing case, where the electrode assembly is disposed in the case, and the end cap covers the opening of the case.

In a third aspect, the embodiment of the application also provides a battery, which comprises a box body and the battery monomer, wherein the box body is used for accommodating the battery monomer.

In a fourth aspect, the embodiment of the application also provides an electric device, which comprises the battery, wherein the battery is used for providing electric energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery according to some embodiments of the present application;

Fig. 3 is a structural exploded view of a battery cell according to some embodiments of the present application;

FIG. 4 is a cross-sectional view of a housing provided in some embodiments of the application;

FIG. 5 is an enlarged view of a portion of the housing shown in FIG. 4 at A;

fig. 6 is a partial enlarged view of the housing shown in fig. 4 at B;

FIG. 7 is an enlarged view of a portion of the housing shown in FIG. 4 at C;

fig. 8 is a partial enlarged view of the housing shown in fig. 4 at D;

fig. 9 is a cross-sectional view of a battery cell according to some embodiments of the present application;

Fig. 10 is a partial enlarged view of the battery cell shown in fig. 9 at E;

fig. 11 is a cross-sectional view of a battery cell according to still other embodiments of the present application;

Fig. 12 is a partial enlarged view of F of the battery cell shown in fig. 11;

fig. 13 is a schematic structural view of a second wall according to some embodiments of the present application.

The icons 1000-vehicle, 100-battery, 10-case, 11-first part, 12-second part, 20-battery cell, 21-electrode assembly, 22-end cap, 23-case, 231-opening, 232-first wall, 2321-first vent, 233-second wall, 2331-second vent, 2332-corner region, 2333-second nano-plating, 234-first insulator, 235-receiving space, 236-chamfer, 237-second insulator, 2371-overlap region, 24-positive electrode terminal, 25-negative electrode terminal, 26-pressure relief mechanism, 200-controller, 300-motor, X-preset direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the 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 terms used in the description of this application in this application are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of this application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification 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.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected through an intermediary, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types, i.e., a cylindrical battery cell, a prismatic battery cell, and a pouch battery cell, according to the packaging method, to which the embodiment of the present application is not limited.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.

The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

The lithium ion battery has the outstanding advantages of high energy density, small environmental pollution, high power density, long service life, wide application range, small self-discharge coefficient and the like, is one of the most widely applied batteries in the world nowadays, and is also an important component of new energy development. With the continuous development of battery technology, higher requirements are also put on the performance and service life of batteries.

The inventor found that in order to improve the use safety of the battery, the phenomenon that contact short circuit is easy to occur between the electrode assembly of the battery cell and the case is reduced, and in the prior art, the electrical isolation between the electrode assembly and the case is generally achieved by wrapping an insulating film on the outer side of the electrode assembly and providing a bottom support plate at the bottom of the case. However, the electrolyte in the single battery shell of the structure is blocked by the insulating film and the bottom support plate, so that the electrolyte backflow effect is poor, the infiltration of the electrode assembly is not facilitated, the single battery performance is further affected, the insulating film and the bottom support plate cannot protect the single battery shell, particles and powder falling off by the electrode assembly and the electrolyte are in direct contact with the single battery shell, the galvanic corrosion phenomenon is easy to occur, the leakage risk is further caused, and the service life of the single battery is not prolonged.

Based on the above, in order to solve the problems of poor performance and short service life of the battery cell, the inventors have conducted intensive studies, devised a case for accommodating an electrode assembly, the case including a first wall, a second wall surrounding the first wall, and a first insulating member having one end connected to the first wall in a predetermined direction and the other end forming an opening, the first insulating member being disposed in the case and thermally compounded on the first wall such that the first insulating member can separate the first wall from the electrode assembly, so that the first wall is insulated from the electrode assembly.

In the above-mentioned casing, set up first insulating part between the first wall of electrode assembly and casing, through with first insulating part thermal composition on first wall can effectively promote the joint strength between first insulating part and the first wall, thereby when the free phenomenon of vibration appears in the use of battery or when the free inside of battery produces gas and causes the casing to appear the phenomenon of inflation, can reduce the risk that drops or produce the clearance between first insulating part and the first wall, thereby the casing that adopts this kind of structure can realize electrode assembly and casing insulation on the one hand, in place to set up the bottom layer board that is used for keeping apart casing and electrode assembly in the casing, thereby receive the bottom layer board when can alleviate electrolyte backward flow in the casing and stop and cause the not good phenomenon of electrode assembly infiltration, and then be favorable to improving the free performance of battery that has this kind of casing, on the other hand can play certain guard action to the casing, effectively reduce the granule and the powder that electrode assembly dropped and electrolyte and the free first wall direct contact of casing, thereby be favorable to improving the anticorrosive ability and the leak protection ability of casing, and then can improve the free life of battery.

In addition, in the production process of the battery cell, the process of installing the bottom support plate at the bottom of the electrode assembly is omitted, the first insulating piece can be thermally compounded on the first wall of the shell in the production branch line of the shell to complete the covering process of the first insulating piece, so that the shell can be subjected to parallel line production with the battery cell, that is, when the shell enters the production assembly line of the battery cell, the covering process of the first insulating piece is completed, and therefore the covering process of the first insulating piece does not occupy the production takt of the battery cell, and further the production efficiency of the battery cell is improved.

The shell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system with the shell, the battery monomer and the like forming the power utilization device can be used, so that the phenomena of poor electrolyte infiltration, liquid leakage and the like of the battery monomer are relieved, and the service performance and the service life of the battery monomer are improved.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. 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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 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 a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

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

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, the case 10 being for accommodating the battery cell 20. The case 10 is used to provide an assembly space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an assembly space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 together define an assembly space, the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or parallel or in parallel-series connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10, however, the battery 100 can also be in a form of a battery module formed by connecting the plurality of battery cells 20 in series or parallel or in parallel-series connection, and then the plurality of battery modules are connected in series or parallel or in parallel-series connection to form a whole and are accommodated in the box 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Each of the battery cells 20 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 includes an electrode assembly 21, an end cap 22, and a case 23, the case 23 is configured to accommodate the electrode assembly 21, an opening 231 is formed at one end of the case 23, and the end cap 22 is configured to cover the opening 231 of the case 23 to form the battery cell 20.

Wherein the housing 23 may also be used to contain an electrolyte, such as an electrolyte solution. The housing 23 may take a variety of structural forms. The material of the housing 23 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

In some embodiments, one end of the case 23 has an opening 231, i.e., the case 23 is a hollow structure having one end open 231, and the end cap 22 is covered at the opening 231 of the case 23 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 21 and the electrolyte.

In assembling the battery cell 20, the electrode assembly 21 may be placed in the case 23, the case 23 may be filled with an electrolyte, and the cap 22 may be then covered on the opening 231 of the case 23.

The housing 23 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 23 may be determined according to the specific shape of the electrode assembly 21. For example, if the electrode assembly 21 has a cylindrical structure, a cylindrical case may be used, and if the electrode assembly 21 has a rectangular parallelepiped structure, a rectangular parallelepiped case may be used. Of course, the end cap 22 may have various structures, for example, the end cap 22 may have a plate-like structure or a hollow structure with one end opened. Illustratively, in fig. 3, the housing 23 has a rectangular parallelepiped structure, the end cover 22 has a plate-like structure, and the end cover 22 covers the opening 231 of the housing 23.

In some embodiments, the battery cell 20 may further include a positive electrode terminal 24, a negative electrode terminal 25, and a pressure relief mechanism 26, each of the positive electrode terminal 24, the negative electrode terminal 25, and the pressure relief mechanism 26 being mounted on the end cap 22. The positive electrode terminal 24 and the negative electrode terminal 25 are each for electrical connection with the electrode assembly 21. The pressure release mechanism 26 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

Illustratively, as shown in fig. 3, a pressure relief mechanism 26 is located between the positive electrode terminal 24 and the negative electrode terminal 25. The pressure relief mechanism 26 may be a component such as an explosion proof valve, an explosion proof disc, a gas valve, a pressure relief valve, or a safety valve.

It is understood that the battery cell 20 is not limited to the above-described structure, and the battery cell 20 may have other structures, for example, the battery cell 20 includes a case 23 and two end caps 22, the case 23 is a hollow structure having opposite end openings 231, and one end cap 22 is correspondingly covered at one opening 231 of the case 23 and forms a sealing connection to form a sealed space for accommodating the electrode assembly 21 and the electrolyte. In this structure, the positive electrode terminal 24 and the negative electrode terminal 25 may be mounted on the same end cap 22 or on different end caps 22, or the pressure release mechanism 26 may be mounted on one end cap 22 or on both end caps 22.

In the embodiment of the present application, the number of the electrode assemblies 21 accommodated in the case 23 may be one or more. Illustratively, in fig. 3, the electrode assemblies 21 are two, and the two electrode assemblies 21 are arranged in a stacked manner.

The electrode assembly 21 is a component in which electrochemical reactions occur in the battery cells 20. The electrode assembly 21 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 21 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or may be a laminated structure formed by laminating a positive electrode sheet, a separator, and a negative electrode sheet.

Referring to fig. 3, and further referring to fig. 4 and 5, fig. 4 is a cross-sectional view of a housing 23 according to some embodiments of the present application, and fig. 5 is a partial enlarged view of a portion of the housing 23 shown in fig. 4. The present application provides a housing 23, the housing 23 comprising a first wall 232, a second wall 233 and a first insulating member 234. The second wall 233 is disposed around the first wall 232, one end of the second wall 233 in the predetermined direction X is connected to the first wall 232, the other end of the second wall 233 in the predetermined direction X forms an opening 231, and the second wall 233 and the first wall 232 together define an accommodating space 235 for accommodating the electrode assembly 21. The first insulating member 234 is disposed in the receiving space 235, the first insulating member 234 is thermally coupled to the first wall 232, and the first insulating member 234 is used to separate the first wall 232 from the electrode assembly 21.

Wherein the first insulating member 234 is thermally compounded on the first wall 232 of the housing 23, that is, the first insulating member 234 is bonded with the first wall 232 of the housing 23 after being thermally fused, such that the first insulating member 234 is thermally fused to the first wall 232, thereby eliminating the need for an adhesive substance between the first insulating member 234 and the first wall 232. The first insulating member 234 is used to separate the first wall 232 from the electrode assembly 21 to achieve insulating isolation of the electrode assembly 21 from the first wall 232 of the case 23, i.e., electrical isolation between the electrode assembly 21 and the first wall 232 of the case 23 is achieved by the first insulating member 234.

Optionally, the first insulating member 234 is a film structure made of an organic polymer insulating material, the first insulating member 234 is laid on the first wall 232 of the housing 23, and the first insulating member 234 has good acid resistance and alkali resistance, and is capable of resisting strong acids with a pH value less than 7 and strong bases with a pH value greater than 12. The material of the first insulating member 234 may be polypropylene or polyethylene terephthalate, for example.

The first insulating piece 234 is thermally compounded on the first wall 232, so that the bonding strength between the first insulating piece 234 and the first wall 232 can be effectively improved, and when the battery cell 20 is in use or the battery cell 20 is in expansion due to gas generated in the battery cell 20, the risk of falling off or generating gaps between the first insulating piece 234 and the first wall 232 can be reduced, on one hand, the insulating isolation between the electrode assembly 21 and the first wall 232 of the housing 23 can be realized by adopting the housing 23 with the structure, on the other hand, the bottom support plate used for isolating the housing 23 and the electrode assembly 21 is arranged in the housing 23, so that the phenomenon that the electrode assembly 21 is not well soaked due to the blocking of the bottom support plate when electrolyte in the housing 23 flows back can be relieved, the performance of the battery cell 20 with the housing 23 can be improved, on the other hand, the particles and powder falling off from the electrode assembly 21 and the electrolyte can be effectively reduced from directly contacting the first wall 232 of the housing 23, the corrosion resistance of the housing 23 can be improved, and the service life of the battery cell 20 can be prolonged. In addition, in the production process of the battery cell 20, the process of installing the bottom plate at the bottom of the electrode assembly 21 is eliminated, and the first insulating member 234 can complete the process of thermally compounding the first insulating member 234 on the first wall 232 of the case 23 in the production branch line of the case 23 to complete the process of covering the first insulating member 234, so that the case 23 can be produced in parallel with the battery cell 20, that is, when the case 23 enters the production assembly line of the battery cell 20, the process of covering the first insulating member 234 is already completed, so that the process of covering the first insulating member 234 does not occupy the production tact of the battery cell 20, thereby being beneficial to improving the production efficiency of the battery cell 20.

Referring to fig. 4 and 5, a chamfer 236 is formed at the junction of the first wall 232 and the second wall 233, according to some embodiments of the present application. In the predetermined direction X, the thickness of the first insulating member 234 is greater than the height of the chamfer 236.

Wherein, the connection of the first wall 232 and the second wall 233 forms a chamfer 236, i.e., an end of the second wall 233 remote from the opening 231 in the predetermined direction X forms the chamfer 236 when being connected to the outer circumferential surface of the first wall 232, so as to facilitate processing. The thickness of the first insulating member 234 is greater than the height of the chamfer 236 in the predetermined direction X, that is, the first insulating member 234 covers the chamfers 236 of the first wall 232 and the second wall 233 in the predetermined direction X.

By setting the thickness of the first insulating member 234 to be greater than the height of the chamfer 236 in the preset direction X, the phenomenon that the electrode assembly 21 collides with the chamfer 236 of the case 23 can be effectively reduced when the electrode assembly 21 is assembled into the accommodating space 235 of the case 23, and the phenomenon that the electrode assembly 21 is extruded or impacted by the chamfer 236 of the case 23 can be reduced in the use process, thereby being beneficial to reducing the risk of deformation or breakage of the electrode assembly 21 in the use process or the assembly process.

According to some embodiments of the application, the thickness of the first insulator 234 is 0.1-0.8mm.

By setting the thickness of the first insulating member 234 between 0.1mm and 0.8mm, it is possible to reduce the phenomenon that the insulating effect of the first insulating member 234 is poor and the service life is short due to the excessively small thickness of the first insulating member 234, on the one hand, to secure the insulating effect and the use reliability of the first insulating member 234, and on the other hand, to alleviate the influence on the capacity of the accommodation space 235 of the case 23 due to the excessively large thickness of the first insulating member 234, to secure the energy density of the battery cell 20 having such case 23.

Referring to fig. 4, and with further reference to fig. 6, fig. 6 is an enlarged view of a portion of the housing 23 shown in fig. 4 at B, in accordance with some embodiments of the present application. The first insulator 234 has a plurality of first apertures that allow at least a portion of the gas to pass through and block the passage of electrolyte. The first wall 232 is provided with a first vent 2321 for at least a portion of the gas to pass through.

The first insulating member 234 has a plurality of first pores that allow at least part of the gas to pass through and prevent the electrolyte from passing through, that is, the material of the first insulating member 234 is formed with a plurality of first pores that can allow part of the gas in the housing 23 to pass through, but can prevent the electrolyte in the housing 23 from passing through, so that the first insulating member 234 has selective permeability.

Alternatively, the first ventilation holes 2321 formed in the first wall 232 may be one or a plurality of. Illustratively, in fig. 6, the first ventilation holes 2321 formed in the first wall 232 are one, and in other embodiments, the first ventilation holes 2321 may be two, three, four, or the like.

The first insulating member 234 has a plurality of first holes, and first hole can allow partial gas to pass through and can prevent electrolyte from passing through, through seting up first air vent 2321 on first wall 232 for the gas in the accommodation space 235 of casing 23 can pass through the outside of casing 23 through first air vent 2321 after the first insulating member 234, thereby can alleviate the phenomenon that the battery monomer 20 that has this kind of casing 23 appears expanding gas or bloated, and then is favorable to improving the safety in utilization and the life of battery monomer 20.

Further, the first pores have a pore diameter of 0.4 to 189nm.

In the use process of the battery cell 20, the gases mainly generated in the housing 23 are hydrogen, carbon monoxide, carbon dioxide, methane and the like, the kinetic diameter of the hydrogen is 0.289nm, the kinetic diameter of the carbon monoxide is 0.376nm, the kinetic diameter of the carbon dioxide is 0.33nm, the kinetic diameter of the methane is 0.38nm, and the kinetic diameters of the gases are all smaller than 0.4nm, so that the first insulating member 234 can be penetrated by the gases. Wherein the electrolyte within the housing 23 has a molecular diameter of less than 189nm such that liquid water and solvent cannot pass through the first insulator 234.

By setting the pore diameter of the first pores to be between 0.4nm and 189nm such that the pore diameter of the first pores is larger than the diameter of a part of the gas molecules and smaller than the diameter of the liquid molecules of the electrolyte, it is achieved that the first insulating member 234 is capable of allowing a part of the gas to pass through but is capable of preventing the electrolyte from passing through.

According to some embodiments of the application, the first wall 232 is formed with a first nano-plating layer to which the first insulator 234 is thermally compounded.

Wherein, the first wall 232 is formed with a first nano-plating layer, i.e., a side of the first wall 232 facing the first insulating member 234 in the preset direction X is nano-treated to form the first nano-plating layer on the first wall 232. If the first ventilation hole 2321 is to be opened in the first wall 232, the first wall 232 needs to be subjected to the first ventilation hole 2321 and then the first wall 232 needs to be subjected to the nano-treatment.

Through forming first nano-plating layer on first wall 232, and first insulating part 234 is thermal-compounded on first nano-plating layer of first wall 232 to can further improve the bonding strength between first insulating part 234 and first wall 232, with the risk that first insulating part 234 appears droing, and then be favorable to improving the reliability of casing 23 in the use.

According to some embodiments of the present application, the material of the first insulating member 234 has a polar group.

The material of the first insulating member 234 has a polar group, that is, after the first insulating member 234 is processed, a polar group is formed in the material of the first insulating member 234, and the polar group may be one or more of-COOH, -OH, -CHO, -NH2, or-SH.

For example, when the material of the first insulating member 234 is polypropylene, the single functional group methyl (-CH 3) in the original polypropylene can be replaced by polar functional groups such as-OH, -COOH, etc. by performing graft modification (e.g. maleic anhydride graft modification) at the plastic particle level, so that the material of the first insulating member 234 has polar groups.

The first insulating member 234 is made of a material with a polar group, that is, the polar group is disposed in the first insulating member 234, so that the bonding firmness between the first insulating member 234 and the first wall 232 of the housing 23 can be effectively improved by the polar group, and the bonding strength between the first insulating member 234 and the first wall 232 is further improved.

According to some embodiments of the present application, referring to fig. 4, the case 23 further includes a second insulating member 237, the second insulating member 237 being disposed in the receiving space 235 along a circumferential direction of the second wall 233, the second insulating member 237 being thermally combined with the second wall 233, the second insulating member 237 being for separating the second wall 233 and the electrode assembly 21.

The second insulating member 237 is thermally compounded on the second wall 233 of the housing 23, and the second insulating member 237 is disposed along the circumferential direction of the second wall 233, that is, the second insulating member 237 is disposed on the second wall 233 along the circumferential direction of the second wall 233, and the second insulating member 237 is combined with the second wall 233 of the housing 23 after being thermally fused, such that the second insulating member 237 is thermally fused and adhered to the second closure, thereby eliminating the need for an adhesive substance between the second insulating member 237 and the second wall 233. The second insulating member 237 is used to separate the second wall 233 and the electrode assembly 21 to achieve insulating isolation of the electrode assembly 21 from the second wall 233 of the case 23, i.e., electrical isolation between the electrode assembly 21 and the second wall 233 of the case 23 is achieved by the second insulating member 237.

Optionally, the second insulating member 237 is a film structure made of an organic polymer insulating material, the second insulating member 237 is laid on the second wall 233 of the housing 23 along the circumferential direction of the second wall 233, and the second insulating member 237 has good acid resistance and alkali resistance, and can resist strong acids with pH values less than 7 and strong bases with pH values greater than 12. The material of the second insulating member 237 may be polypropylene or polyethylene terephthalate, for example.

The second insulating member 237 is thermally compounded on the second wall 233, so that the bonding strength of the second insulating member 237 and the second wall 233 can be improved, when vibration occurs in the use process of the battery cell 20 or when gas is generated in the battery cell 20 to cause expansion of the shell 23, the risk of falling off or generating gaps between the second insulating member 237 and the second wall 233 can be reduced, and the shell 23 adopting the structure can realize insulating isolation between the electrode assembly 21 and the second wall 233 of the shell 23 on one hand, replace an insulating film used for isolating the shell 23 and the electrode assembly 21 in the shell 23, so that the phenomenon that electrolyte is free between the second wall 233 and the insulating film and is blocked by the insulating film when the electrolyte in the shell 23 flows back to cause poor infiltration of the electrode assembly 21 can be reduced, the performance of the battery cell 20 with the shell 23 can be improved, the shell 23 can be protected to a certain extent, the direct contact between the electrolyte and the second wall 233 of the shell 23 can be effectively reduced, the anti-corrosion capability of the shell 23 can be improved, and the service life of the battery cell 20 can be prolonged. In addition, in the production process of the battery cell 20, the process of providing the insulating film on the outer circumferential side of the electrode assembly 21 is eliminated, and the second insulating member 237 can be thermally compounded on the second wall 233 of the case 23 in the production branch line of the case 23 to complete the covering process of the second insulating member 237, so that the case 23 can be produced in parallel with the battery cell 20, that is, when the case 23 enters the production assembly line of the battery cell 20, the covering process of the second insulating member 237 is already completed, so that the covering process of the second insulating member 237 does not occupy the production tact of the battery cell 20, thereby being advantageous for improving the production efficiency of the battery cell 20.

Referring to fig. 4, and with further reference to fig. 7, fig. 7 is an enlarged view of a portion of the housing 23 at C shown in fig. 4, according to some embodiments of the present application. The distance between the edge of the second insulating member 237 near the opening 231 and the opening 231 in the preset direction X is 1-8mm.

Wherein, in the preset direction X, the distance between the edge of the second insulating member 237 adjacent to the opening 231 and the opening 231 is 1-8mm (as shown in fig. 7, d in fig. 7 is the distance between the edge of the second insulating member 237 adjacent to the opening 231 and the opening 231), that is, the edge of the second insulating member 237 is spaced from the edge of the second wall 233, so as to facilitate the installation of the end cap 22 when the end cap 22 is covered at the opening 231 of the housing 23.

By disposing the second insulating member 237 close to the edge of the opening 231 of the case 23 at a distance from the opening 231, that is, by providing the second insulating member 237 close to the edge of the opening 231 of the case 23 at a distance from the opening 231, the end cap 22 of the battery cell 20 is less affected and interfered by the second insulating member 237 when being covered at the opening 231 of the case 23, so that the connection reliability of the end cap 22 and the case 23 can be ensured.

According to some embodiments of the application, the thickness of the second insulating member 237 is 0.03-0.5mm.

By setting the thickness of the second insulating member 237 between 0.03mm and 0.5mm, on the one hand, the phenomenon that the insulating effect of the second insulating member 237 is poor and the service life is short due to the excessively small thickness of the second insulating member 237 can be reduced to ensure the insulating effect and the use reliability of the second insulating member 237, and on the other hand, the influence on the capacity of the accommodation space 235 of the case 23 due to the excessively large thickness of the second insulating member 237 can be alleviated to ensure the energy density of the battery cell 20 having such case 23.

Referring to fig. 4, and with further reference to fig. 8, fig. 8 is an enlarged view of a portion of the housing 23 shown in fig. 4 at D, in accordance with some embodiments of the present application. The second insulator 237 has a plurality of second apertures that allow at least a portion of the gas to pass therethrough and prevent the electrolyte from passing therethrough. The second wall 233 is provided with a second vent hole 2331 for passing at least part of the gas.

The second insulating member 237 has a plurality of second pores that allow at least a part of the gas to pass through and prevent the electrolyte from passing through, that is, the material of the second insulating member 237 is formed with a plurality of second pores that allow a part of the gas in the case 23 to pass through but prevent the electrolyte in the case 23 from passing through, so that the second insulating member 237 has a selective permeability.

Alternatively, the second vent holes 2331 may be formed in the second wall 233. Illustratively, in fig. 6, the second vent holes 2331 are one, and in other embodiments, the second vent holes 2331 may be two, three, four, etc.

The second insulating member 237 has a plurality of second apertures, and the second apertures can allow partial gas to pass through and can prevent electrolyte from passing through, through offer the second vent 2331 on the second wall 233 for the gas in the accommodation space 235 of casing 23 can pass through the second insulating member 237 after the outside of casing 23 through the second vent 2331, thereby can alleviate the phenomenon that the battery monomer 20 that has this kind of casing 23 appears expanding gas or bloated, and then is favorable to improving the safety in utilization and the life of battery monomer 20.

Further, the second pores have a pore diameter of 0.4 to 189nm.

In the use process of the battery cell 20, the main gases generated in the housing 23 are hydrogen, carbon monoxide, carbon dioxide, methane and the like, the kinetic diameter of the hydrogen is 0.289nm, the kinetic diameter of the carbon monoxide is 0.376nm, the kinetic diameter of the carbon dioxide is 0.33nm, the kinetic diameter of the methane is 0.38nm, and the kinetic diameters of the gases are all smaller than 0.4nm, so that the second insulating member 237 can be penetrated by the gases. Wherein the molecular diameter of the electrolyte within the housing 23 is less than 189nm, such that liquid water and solvent cannot pass through the second insulator 237.

By setting the pore diameter of the second pore to be between 0.4nm and 189nm so that the pore diameter of the second pore is larger than the diameter of a part of the gas molecules and smaller than the diameter of the liquid molecules of the electrolyte, it is achieved that the second insulating member 237 can allow a part of the gas to pass through but can prevent the electrolyte from passing through.

Referring to fig. 9 and 10, fig. 9 is a cross-sectional view of a battery cell 20 according to some embodiments of the present application, and fig. 10 is a partial enlarged view of the battery cell 20 shown in fig. 9 at E. The second insulating member 237 is overlapped and thermally compositely connected at both end portions in the circumferential direction of the second wall 233 to form an overlapped region 2371.

Wherein, the two end portions of the second insulating member 237 in the circumferential direction of the second wall 233 are overlapped and thermally compositely connected, that is, after the second insulating member 237 is thermally composited on the second wall 233 along the circumferential direction of the second wall 233, the two free ends of the second insulating member 237 in the circumferential direction of the second wall 233 are overlapped and thermally composited with each other. The first and second end portions of the second insulating member 237 in the circumferential direction of the second wall 233 are thermally and compositely connected to each other such that the first and second end portions of the second insulating member 237 are thermally melted and bonded to each other.

Alternatively, the second insulating member 237 may be one or more. Illustratively, in fig. 9, the second insulating member 237 is one, and the first and second end portions of the second insulating member 237 in the circumferential direction of the second wall 233 are thermally compositely connected after being overlapped with each other. Of course, in other embodiments, the second insulating member 237 may be plural, and plural second insulating members 237 are stacked in order from end to end along the circumferential direction of the second wall 233 and then thermally and compositely connected.

The second insulating member 237 is laid on the second wall 233 along the circumferential direction of the second wall 233, and the head and tail end parts of the second insulating member 237 in the circumferential direction of the second wall 233 are mutually overlapped and then thermally combined and connected, so that the connecting strength of the head and tail end parts of the second insulating member 237 can be improved, the risk of gaps occurring in the second insulating member 237 can be relieved, and the phenomenon that electrolyte in the housing 23 enters between the second insulating member 237 and the second wall 233 through the gaps of the second insulating member 237 can be reduced, thereby being beneficial to improving the protection effect of the second insulating member 237 on the housing 23.

In accordance with some embodiments of the present application, as further shown in fig. 9 and 10, the second wall 233 includes a plurality of walls connected end to end in sequence along a circumferential direction thereof, a corner region 2332 is formed at a connection of each adjacent two walls, and an overlapping region 2371 is disposed corresponding to the corner region 2332.

The second wall 233 includes a plurality of walls connected end to end in the circumferential direction thereof, that is, the second wall 233 has a polygonal structure, that is, the housing 23 has a polygonal structure. Illustratively, in fig. 9, the second wall 233 includes four walls that are connected end to end in sequence to form the rectangular-structured housing 23, such that the overlapping region 2371 of the second insulating member 237 is disposed correspondingly at the corner region 2332 of the second wall 233, i.e., at the corner of the rectangular-structured housing 23.

Alternatively, when the overlap region 2371 is provided at the corner region 2332 of the second wall 233, the overlap region 2371 may extend from the corner region 2332 of the second wall 233 toward two walls adjacent to the corner region 2332 in the circumferential direction of the second wall 233. Illustratively, in fig. 9 and 10, the overlap region 2371 extends from the corner region 2332 of the second wall 233 toward one wall in the width direction of the second wall 233 in the circumferential direction of the second wall 233, and in other embodiments, as shown in fig. 11 and 12, fig. 11 is a cross-sectional view of the battery cell 20 provided in still other embodiments of the present application, fig. 12 is a partial enlarged view at F of the battery cell 20 shown in fig. 11, and the overlap region 2371 extends from the corner region 2332 of the second wall 233 toward one wall in the length direction of the second wall 233 in the circumferential direction of the second wall 233.

Note that the length of the overlap region 2371 in the circumferential direction of the second wall 233 is less than or equal to half the thickness of the individual electrode assembly 21.

Since the electrode assembly 21 in the case 23 cannot be completely adhered to the corner region 2332 of the second wall 233, a gap exists between the electrode assembly 21 and the corner region 2332 of the second wall 233, and the overlapping region 2371 is a region where the end-to-end ends of the second insulating member 237 overlap each other and then protrude out of the second wall 233, so that the overlapping region 2371 of the second insulating member 237 is correspondingly disposed in the corner region 2332 of the second wall 233, which can reduce the collision phenomenon between the electrode assembly 21 and the overlapping region 2371, and can effectively reduce the influence of the overlapping region 2371 on the capacity of the electrode assembly 21 in the accommodating space 235.

Referring to fig. 13, fig. 13 is a schematic structural view of a second wall 233 according to some embodiments of the present application. The second wall 233 is formed with a second nano-plating layer 2333, and the second insulating member 237 is thermally compounded with the second nano-plating layer 2333.

Wherein, the second nano-plating layer 2333 is formed on the second wall 233, that is, the inner circumferential surface of the second wall 233 is nano-treated to form the second nano-plating layer 2333 on the second wall 233. If the second vent holes 2331 are to be opened in the second wall 233, the second wall 233 needs to be subjected to the second vent holes 2331 first and then the second wall 233 needs to be subjected to the nano-treatment.

Alternatively, the second wall 233 may have the second nano-plating layer 2333 formed thereon locally, or may have the second nano-plating layer 2333 formed thereon entirely.

By forming the second nano-plating layer 2333 on the second wall 233, and thermally compounding the second insulating member 237 on the second nano-plating layer 2333 of the second wall 233, the bonding strength between the second insulating member 237 and the second wall 233 can be further improved, so that the risk of falling off the second insulating member 237 is reduced, and the reliability of the housing 23 in the use process is further improved.

Further, with continued reference to fig. 13, the second nano-plating layer 2333 has a ring-shaped structure extending along the circumferential direction of the second wall 233. In the preset direction X, the second nano-plating layer 2333 extends from the edge of the second insulating member 237 near the opening 231 toward the direction facing the first wall 232.

Wherein, in the preset direction X, the second nano-plating layer 2333 extends from the edge of the second insulating member 237 near the opening 231 toward the direction facing the first wall 232, i.e., the region thermally compounded with the edge of the second insulating member 237 on the second wall 233 is preferentially nano-treated, so that the second nano-plating layer 2333 forms an annular structure extending along the circumferential direction of the second wall 233.

In some embodiments, as shown in fig. 13, corner regions 2332 of the second wall 233 are also formed with nano-plating to ensure bonding strength of the overlapping region 2371 of the second insulator 237 with the second wall 233. Of course, the above structures are all formed by performing the partial nano-process on the second wall 233 so that the second nano-plating layer 2333 is partially formed on the second wall 233, and in a preferred embodiment, in order to secure the bonding strength of the second insulating member 237 and the second wall 233, the entire inner circumferential surface of the second wall 233 may be nano-processed so as to form the second nano-plating layer 2333 on the entire inner circumferential surface of the second wall 233.

The second nano-plating layer 2333 is configured to have an annular structure extending along the circumferential direction of the second wall 233, and the second nano-plating layer 2333 extends from the edge of the second insulating member 237 to the direction facing the first wall 232 along the preset direction X, so that the second nano-plating layer 2333 is formed in the region where the edge of the second insulating member 237 and the second wall 233 are thermally compounded, and thus the bonding strength between the edge of the second insulating member 237 and the second wall 233 can be improved, and the phenomenon that the electrolyte permeates between the second insulating member 237 and the second wall 233 from the edge of the second insulating member 237 can be effectively relieved.

According to some embodiments of the application, the material of the second insulating member 237 has a polar group.

The material of the second insulating member 237 has a polar group, that is, after the second insulating member 237 is processed, a polar group is formed in the material of the second insulating member 237, and the polar group may be one or more of-COOH, -OH, -CHO, -NH2, or-SH.

For example, when the material of the second insulating member 237 is polypropylene, the single functional group methyl (-CH 3) in the original polypropylene can be partially substituted with polar functional groups such as-OH, -COOH, etc., by performing graft modification (e.g., maleic anhydride graft modification) at the plastic particle level, so that the material of the second insulating member 237 has polar groups.

The second insulating member 237 made of a material having a polar group, that is, the second insulating member 237 has a polar group, so that the bonding firmness between the second insulating member 237 and the second wall 233 of the housing 23 can be effectively improved by the polar group, thereby further improving the bonding strength between the second insulating member 237 and the second wall 233.

According to some embodiments of the present application, referring to fig. 4 and 5, the first insulating member 234 is thermally and compositely connected to an end of the second insulating member 237 away from the opening 231 in the predetermined direction X.

Wherein, the first insulating member 234 and the second insulating member 237 are thermally and compositely connected, that is, the first insulating member 234 and the second insulating member 237 are bonded together after being soaked and melted.

Alternatively, in other embodiments, the first insulating member 234 and the second insulating member 237 may be of unitary construction.

By thermally and compositely connecting one end of the first insulating member 234 and one end of the second insulating member 237, on the one hand, the connection strength between the first insulating member 234 and the second insulating member 237 can be improved, and on the other hand, the occurrence of a phenomenon of a gap between the first insulating member 234 and the second insulating member 237 can be reduced, thereby reducing the risk of infiltration of an electrolyte from the gap between the first insulating member 234 and the second insulating member 237.

The present application also provides a battery cell 20 including an electrode assembly 21, an end cap 22, and a case 23 of any of the above aspects, according to some embodiments of the present application. The electrode assembly 21 is placed in the case 23, and the cap 22 is covered with the opening 231 of the case 23.

Illustratively, the end cap 22 is welded to the housing 23 after covering the opening 231 of the housing 23.

According to some embodiments of the present application, the present application further provides a battery 100, including a case 10 and the battery cell 20 according to any one of the above aspects, wherein the case 10 is used for accommodating the battery cell 20.

According to some embodiments of the present application, there is also provided an electric device including the battery 100 of any of the above aspects, and the battery 100 is used to provide electric power to the electric device.

The powered device may be any of the devices or systems described above that employ battery 100.

According to some embodiments of the present application, referring to fig. 4 to 10, there is provided a case 23, the case 23 including a first wall 232, a second wall 233, a first insulating member 234, and a second insulating member 237, the first wall 232 having a first nano-plating layer formed thereon, the second wall 233 having a second nano-plating layer 2333 formed thereon, the second wall 233 being disposed around the first wall 232, the second wall 233 having a plurality of corner regions 2332, one end of the second wall 233 in a predetermined direction X being connected to the first wall 232 and forming a chamfer 236, the other end of the second wall 233 in the predetermined direction X forming an opening 231, the second wall 233 and the first wall 232 together defining a receiving space 235 for receiving the electrode assembly 21. The first insulating member 234 is thermally compounded on the first wall 232, the thickness of the first insulating member 234 in the preset direction X is greater than the chamfer 236 of the first wall 232 and the second wall 233, the first insulating member 234 has a plurality of first pores with a pore diameter of 0.4-189nm, and correspondingly, the first wall 232 is provided with a first ventilation hole 2321 for ventilation. The second insulating member 237 is thermally compounded to the second wall 233 along the circumferential direction of the second wall 233, and the end portions of the second insulating member 237 are overlapped with each other and then thermally compounded to form an overlapped region 2371, the overlapped region 2371 is correspondingly arranged at a corner region 2332 of the second wall 233, the second insulating member 237 is provided with a plurality of second pores with the pore diameters of 0.4-189nm, and correspondingly, the second wall 233 is provided with second ventilation pores 2331 for ventilation.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A housing for accommodating an electrode assembly, comprising:

First wall;

a second wall, the second wall being arranged around the first wall, one end of the second wall in a preset direction being connected to the first wall, the other end of the second wall in the preset direction forming an opening, and the second wall and the first wall jointly defining an accommodation space for accommodating the electrode assembly; and

a first insulating member, the first insulating member being disposed in the accommodation space, the first insulating member being thermally bonded to the first wall, and the first insulating member being used to separate the first wall and the electrode assembly;

The first insulating member has a plurality of first pores that allow at least part of the gas to pass through and prevent the electrolyte from passing through, and the first wall is provided with a first vent hole for allowing at least part of the gas to pass through.

2. The housing according to claim 1, wherein a chamfer is formed at a connection between the first wall and the second wall;

In the preset direction, the thickness of the first insulating member is greater than the height of the chamfer.

3 . The housing according to claim 2 , wherein the thickness of the first insulating member is 0.1-0.8 mm.

4 . The shell according to claim 1 , wherein the pore size of the first pore is 0.4-189 nm.

5 . The housing according to claim 1 , wherein a first nano-plating layer is formed on the first wall, and the first insulating member is thermally composited with the first nano-plating layer.

The housing according to claim 1 , wherein the material of the first insulating member has a polar group.

7. The housing according to any one of claims 1 to 6, characterized in that the housing further comprises:

A second insulating member is disposed in the accommodation space along the circumference of the second wall, the second insulating member is thermally composited to the second wall, and the second insulating member is used to separate the second wall and the electrode assembly.

8 . The housing according to claim 7 , wherein in the preset direction, a distance between an edge of the second insulating member close to the opening and the opening is 1-8 mm.

9. The housing according to claim 7, wherein the thickness of the second insulating member is 0.03-0.5 mm.

10. The housing according to claim 7, wherein the second insulating member has a plurality of second pores that allow at least part of the gas to pass through and prevent the electrolyte from passing through;

The second wall is provided with a second vent hole for allowing at least part of the gas to pass through.

11. The housing according to claim 10, characterized in that the pore size of the second pore is 0.4-189 nm.

12 . The housing according to claim 7 , wherein the second insulating member overlaps and is thermally composited at both end portions of the second wall in the circumferential direction to form an overlapping area.

13. The housing according to claim 12, wherein the second wall comprises a plurality of walls connected end to end in sequence along its circumferential direction, and a connection between each two adjacent walls forms a corner area;

The overlapping area is arranged corresponding to the corner area.

14 . The housing according to claim 7 , wherein a second nano-plating layer is formed on the second wall, and the second insulating member is thermally composited with the second nano-plating layer.

15. The housing according to claim 14, wherein the second nano-plating layer is an annular structure extending along the circumference of the second wall;

In the preset direction, the second nano-plating layer extends from an edge of the second insulating member close to the opening toward a direction facing the first wall.

16 . The housing according to claim 7 , wherein the material of the second insulating member has a polar group.

17 . The housing according to claim 7 , wherein the first insulating member and the second insulating member are thermally compositely connected at one end away from the opening in the preset direction.

18. A battery cell, comprising:

Electrode assembly;

end caps; and

The shell according to any one of claims 1 to 17, wherein the electrode assembly is placed in the shell, and the end cover covers the opening of the shell.

19. A battery, comprising:

The battery cell as claimed in claim 18; and

A box body is used to accommodate the battery cells.

20. An electrical device, comprising the battery as claimed in claim 19, wherein the battery is used to provide electrical energy.