Insulating part for coating battery core, electrode assembly, battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides an insulating part for coating a battery cell, an electrode assembly, a battery monomer, a battery and a power utilization device, and the insulating part comprises a middle folding sheet which is provided with a positioning hole; the first folding sheet is connected with the middle folding sheet at a first folding line, and the first folding sheet comprises a first main folding sheet and a side folding sheet connected with the first main folding sheet at a third folding line; the extension sheet is connected to one end, close to the middle folding sheet, of the side folding sheet at the fourth folding line; the second folding sheet is connected with the middle folding sheet at a second folding line; wherein the middle folding sheet is configured to cover the bottom of the battery cell, the first folding sheet and the second folding sheet are configured to cover the circumferential side part of the battery cell after being folded, and the extension sheet is configured to completely cover the positioning hole. The insulating part can prevent the battery cell from being in contact with the shell and can receive active substances falling from the pole piece of the battery cell, so that electrochemical corrosion of the shell is avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an insulating member for covering a battery core, an electrode assembly, a battery cell, a battery, and an electrical device. Background Art

[0002] During the manufacturing process of the battery, at least one battery cell group needs to be placed in an aluminum shell to complete the assembly. In order to prevent the battery cell from directly contacting the shell and causing corrosion to the shell, the outside of the battery cell group is coated with a Mylar (a tough polyester polymer) film, but the problem of shell corrosion still exists. Summary of the invention

[0003] Some embodiments of the present application provide an insulating member for covering a battery core, an electrode assembly, a battery cell, a battery, and an electrical device, which are used to alleviate the problem of corrosion of the shell.

[0004] Some embodiments of the present application provide an insulating member for covering a battery cell, comprising: a middle fold sheet having a positioning hole thereon; a first fold sheet connected to the middle fold sheet at a first fold line, the first fold sheet comprising a first main fold sheet and a side fold sheet connected to the first main fold sheet at a third fold line, the third fold line being perpendicular to the first fold line; an extension sheet connected to an end of the side fold sheet close to the middle fold sheet at a fourth fold line, the fourth fold line being perpendicular to the third fold line; and a second fold sheet connected to the middle fold sheet at a second fold line, the second fold line being parallel to the first fold line; wherein the middle fold sheet is configured to cover the bottom of the battery cell, the first fold sheet and the second fold sheet are configured to cover the circumferential side of the battery cell after folding, and the extension sheet is configured to completely cover the positioning hole after folding.

[0005] The side folding piece of the insulating part is connected to the extension piece, and the extension piece covers the positioning hole after being folded, thereby playing the role of insulation protection, which can prevent the battery cell at the positioning hole from contacting the shell, and can catch the active material falling from the electrode piece of the battery cell, preventing the active material from falling onto the shell and causing electrochemical corrosion to the shell, and has the function of protecting the performance and safety of the battery cell.

[0006] In some embodiments, the extension piece is configured to not exceed the area between the first fold line and the second fold line in the width direction of the middle fold piece after being folded along the fourth fold line.

[0007] After the extension sheet is folded, it does not exceed the area between the first fold line and the second fold line in the width direction of the middle fold sheet, which is beneficial to ensure that the battery core absorbs the electrolyte in the shell.

[0008] In some embodiments, after the extension piece is folded along the fourth fold line, in the width direction of the middle fold piece, the distance between the extension piece and the first fold line is at least 2 mm, and the distance between the extension piece and the second fold line is at least 2 mm.

[0009] The maximum width of the extension piece is at least 4 mm smaller than the distance between the first fold line and the second fold line, and the corresponding single-side gap is greater than or equal to 2 mm, which is conducive to ensuring that the battery core absorbs the electrolyte in the shell.

[0010] In some embodiments, the extension sheet is configured to cover at least a portion of an end portion of the battery cell along the length direction after being folded along the fourth folding line.

[0011] After being folded, the extended sheet covers at least part of the end of the battery cell along the length direction, which can prevent the end of the battery cell in the length direction from contacting the shell, and can catch the active material falling from the end of the battery cell along the length direction, avoiding the active material from falling into the shell and causing electrochemical corrosion of the shell.

[0012] In some embodiments, there are a plurality of battery cells, and the extension sheet is configured to cover at least a portion of an end portion of each battery cell along the length direction after being folded along the fourth fold line.

[0013] After being folded, the extended sheet covers at least a portion of the end portion of each battery cell along the length direction, thereby preventing the end portion of each battery cell along the length direction from contacting the shell, and catching the active material falling from the end portion of each battery cell along the length direction, thereby preventing the active material from falling into the shell and causing electrochemical corrosion to the shell.

[0014] In some embodiments, the length direction of the extension piece is defined to be perpendicular to the fourth fold line, and the length of the extension piece is defined to be L, where L is not greater than the distance between the first fold line and the second fold line.

[0015] Since the extension piece covers the positioning hole after being folded, the length L of the extension piece is not greater than the distance between the first fold line and the second fold line, and the positioning hole can be positioned.

[0016] In some embodiments, the length of the extension piece L>s+d+x, wherein s is the minimum distance between the positioning hole and the fourth fold line after the extension piece is folded along the fourth fold line, d is the diameter of the positioning hole, and x is not less than 2 mm.

[0017] The length of the extension piece L>s+d+x can ensure that the extension piece completely covers the positioning hole.

[0018] In some embodiments, the side fold sheet includes a first side fold sheet and a second side fold sheet, and the first side and the second side of the first main fold sheet both have a third fold line; the first side fold sheet is connected to the first main fold sheet at the third fold line on the first side of the first main fold sheet; the second side fold sheet is connected to the first main fold sheet at the third fold line on the second side of the first main fold sheet; the extension sheet includes a first extension sheet and a second extension sheet, and the first side fold sheet and the second side fold sheet both have a fourth fold line at one end close to the middle fold sheet; the first extension sheet is connected to the first side fold sheet at the fourth fold line on the first side fold sheet; the second extension sheet is connected to the second side fold sheet at the fourth fold line on the second side fold sheet; the positioning hole includes a first positioning hole and a second positioning hole, and the battery cell includes a first side portion, a second side portion and a bottom portion; the first extension sheet is configured to cover at least a portion of the corners of the first side portion and the bottom of the battery cell after folding, and completely cover the first positioning hole; the second extension sheet is configured to cover at least a portion of the corners of the second side portion and the bottom of the battery cell after folding, and completely cover the second positioning hole.

[0019] A first side folding piece and a second side folding piece are respectively arranged on both sides of the first main folding piece, and the first side folding piece and the second side folding piece are used to cover the two end side parts of the battery cell in the length direction. The first side folding piece is connected to the first extension piece, and the second side folding piece is connected to the second extension piece. The first extension piece and the second extension piece can cover the corners of the two end side parts and the bottom of the battery cell, and in order for the mechanical equipment to automatically grab the insulating part when the insulating part covers the battery cell, and to facilitate the operation of covering the insulating part, two positioning holes are arranged on the insulating part, and the first extension piece and the second extension piece can cover one positioning hole respectively, so as to achieve all-round covering of the battery cell.

[0020] In some embodiments, the second folding piece includes a second main folding piece, and a lap piece connected to the second main folding piece at a fifth fold line, the lap piece and the side folding piece are configured to overlap each other after folding, and the fifth folding line is perpendicular to the second folding line.

[0021] After being folded, the overlapping pieces and the side folding pieces can completely cover the two end sides of the battery cell in the length direction. The middle folding piece covers the bottom of the battery cell. After being folded, the first main folding piece and the second main folding piece can cover the two side parts of the battery cell in the width direction, thereby achieving all-round covering of the battery cell.

[0022] Some embodiments of the present application further provide an electrode assembly, which includes at least one battery cell and the above-mentioned insulating member, wherein the insulating member is folded to cover at least a portion of a surface of the at least one battery cell.

[0023] The electrode assembly includes the insulating member provided in the embodiment of the present disclosure, and correspondingly possesses the beneficial effects of the insulating member provided in the embodiment of the present disclosure, which will not be elaborated here.

[0024] Some embodiments of the present application further provide a battery cell, which includes a shell and the above-mentioned electrode assembly, wherein the electrode assembly is disposed in the shell.

[0025] The battery cell includes the electrode assembly provided in the embodiment of the present disclosure, and correspondingly possesses the beneficial effects of the electrode assembly provided in the embodiment of the present disclosure, which will not be elaborated here.

[0026] Some embodiments of the present application further provide a battery, which includes a box and at least one of the above-mentioned battery cells, wherein the battery cell is disposed in the box.

[0027] The battery includes the battery cell provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery cell provided by the embodiment of the present disclosure, which will not be elaborated here.

[0028] Some embodiments of the present application also provide an electrical device, which includes the battery according to the above.

[0029] The electrical device includes the battery provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery provided by the embodiment of the present disclosure, which will not be elaborated here.

[0030] Some embodiments of the present application also provide an assembly method of an electrode assembly, which includes the following steps: providing at least one battery cell; providing an insulating member, the insulating member including: a middle folding sheet having a positioning hole thereon; a first folding sheet connected to the middle folding sheet at a first fold line, the first folding sheet including a first main folding sheet and a side folding sheet connected to the first main folding sheet at a third folding line, the third folding line being perpendicular to the first folding line; an extension sheet connected to an end of the side folding sheet close to the middle folding sheet at a fourth folding line, the fourth folding line being perpendicular to the third folding line; and a second folding sheet connected to the middle folding sheet at a second folding line, the second folding line being parallel to the first folding line; placing the at least one battery cell on the middle folding sheet, and arranging them in sequence along the direction between the first folding line and the second folding line, so that the middle folding sheet covers the bottom of the at least one battery cell; and folding the first folding sheet and the second folding sheet so that the first folding sheet and the second folding sheet cover the circumferential side of the at least one battery cell, and folding the extension sheet so that the extension sheet completely covers the positioning hole.

[0031] The middle folding sheet covers the bottom of the battery cell, the first folding sheet and the second folding sheet cover the circumferential side of the battery cell, the extension sheet covers at least part of the corners of the side and bottom of the battery cell and completely covers the positioning hole, and the insulating part can cover the circumferential side, bottom and corner area of ​​the side and bottom of the battery cell, and can also cover the positioning holes set by itself, so as to cover the battery cell in all directions and prevent electrochemical corrosion of the shell.

[0032] Based on the above technical solution, this application has at least the following beneficial effects:

[0033] In some embodiments, the side folding piece of the insulating part is connected to the extension piece, and the extension piece completely covers the positioning hole after being folded, thereby playing a role of insulation protection. It can prevent the battery cell at the positioning hole from contacting the shell, and can catch the active material falling from the electrode of the battery cell, preventing the active material from falling onto the shell and causing electrochemical corrosion to the shell, and has the function of protecting the performance and safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0035] Figure 1 is a schematic structural diagram of a vehicle disclosed in some embodiments of the present application;

[0036] Figure 2 is a schematic diagram of an exploded structure of a battery disclosed in some embodiments of the present application;

[0037] Figure 3 is a schematic diagram of the exploded structure of a battery cell disclosed in some embodiments of the present application;

[0038] Figure 4 is a schematic diagram of the expanded structure of an insulating member for covering a battery core disclosed in some embodiments of the present application;

[0039] Figure 5 is a schematic diagram of a folding process of an insulating member for covering a battery core disclosed in some embodiments of the present application;

[0040] Figure 6a is a schematic diagram of an end cap assembly and a battery cell disclosed in some embodiments of the present application;

[0041] Figure 6b is a schematic diagram of an insulating member covering a battery cell disclosed in some embodiments of the present application;

[0042] Figure 6c is a side view schematic diagram of an insulating member wrapped around a battery cell disclosed in some embodiments of the present application;

[0043] Figure 6d is a bottom view schematic diagram of an insulating member covering a battery cell disclosed in some embodiments of the present application;

[0044] Figure 7a is a schematic diagram of an end cap assembly and two battery cells disclosed in some embodiments of the present application;

[0045] Figure 7b is a schematic diagram of an insulating member covering two battery cells disclosed in some embodiments of the present application;

[0046] Figure 7c is a side view schematic diagram of an insulating member covering two battery cells disclosed in some embodiments of the present application;

[0047] Figure 7d is a bottom view schematic diagram of an insulating member covering two battery cells disclosed in some embodiments of the present application;

[0048] Figure 8a is a schematic diagram of an end cap assembly and four battery cells disclosed in some embodiments of the present application;

[0049] Figure 8b is a schematic diagram of an insulating member covering four battery cells disclosed in some embodiments of the present application;

[0050] Figure 8c is a side view schematic diagram of an insulating member covering four battery cells disclosed in some embodiments of the present application;

[0051] Figure 8d It is a bottom view schematic diagram of the insulating member covering four battery cells disclosed in some embodiments of the present application.

[0052] In the drawings, the drawings are not drawn to scale.

[0053] Marking instructions: 1-first fold; 11-first main fold; 12-side fold; 12a-first side fold; 12b-second side fold; 2-second fold; 21-second main fold; 22-lap piece; 22a-first lap piece; 22b-second lap piece; 3-middle fold; 31-positioning hole; 31a-first positioning hole; 31b-second positioning hole; 4-extension piece; 41-first extension piece; 42-second extension piece; 51-first fold line; 52-second fold line ; 53-third fold line; 54-fourth fold line; 55-fifth fold line; 100-electrode assembly; 101-battery cell; 102-insulating member; 103-ear assembly; 200-battery cell; 201-housing; 202-end cover assembly; 202a-end cover; 202b-terminal; 202c-explosion-proof valve; 300-battery; 301-housing; 302-cover; 400-vehicle; 401-axle; 402-wheel; 403-motor; 404-controller. DETAILED DESCRIPTION

[0054] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0055] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0056] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0057] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0058] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for accommodating the battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0059] The battery of the present application can be used in electrical devices to provide electrical energy for the electrical devices. The electrical devices may be mobile phones, portable devices, laptop computers, battery vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0060] The electrical device may also be a vehicle 400, such as a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; or the electrical device may also be a drone or a ship, etc.

[0061] refer to Figure 1 The vehicle 400 includes an axle 401, a wheel 402 connected to the axle 401, a motor 403, a controller 404 and a battery 300. The motor 403 is used to drive the axle 401 to drive the wheel 402 to rotate. The controller 404 is used to control the operation of the motor 403. The battery 300 can be set at the bottom, head or tail of the vehicle 400 to provide electrical energy for the operation of the motor 403 and other components in the vehicle.

[0062] refer to Figure 2 The battery 300 includes a box body 301, a cover body 302 and at least one battery cell 200. The at least one battery cell 200 includes more than two battery cells 200, and the multiple battery cells 200 can be connected in series, in parallel or in mixed connection, where mixed connection refers to a mixture of series connection and parallel connection.

[0063] The box body 301 and the cover body 302 are buckled together. For example, the box body 301 and the cover body 302 can both be hollow cuboids and each has only one open face, the opening of the box body 301 and the opening of the cover body 302 are arranged opposite to each other, and the box body 301 and the cover body 302 are buckled together to form a box body with a closed chamber. Alternatively, the box body 301 is a cuboid with an opening and the cover body 302 is plate-shaped, or the cover body 302 is a cuboid with an opening and the box body 301 is plate-shaped, and the box body 301 and the cover body 302 are arranged opposite to each other and buckled together to form a box body with a closed chamber. After a plurality of battery cells 200 are connected in parallel, in series, or in mixed series, they are placed in the closed chamber formed by the buckling of the box body 301 and the cover body 302.

[0064] refer to Figure 3Each battery cell 200 includes an electrode assembly 100, a shell 201 and an end cap assembly 202. The shell 201 is determined according to the shape of one or more electrode assemblies 100 after being combined. For example, the shell 201 can be a hollow cuboid, a cube or a cylinder, and one of the surfaces of the shell 201 has an opening so that one or more electrode assemblies 100 can be placed in the shell 201. For example, when the shell 201 is a hollow cuboid or a cube, one of the planes of the shell 201 is an open surface, that is, the plane does not have a shell wall so that the shell 201 is connected to the inside and outside. When the shell 201 is a hollow cylinder, the circular side of the shell 201 is an open surface, that is, the circular side does not have a shell wall so that the shell 201 is connected to the inside and outside. The end cap assembly 202 is connected to the shell 201 at the opening of the shell 201 to form a closed shell for placing the electrode assembly 100, and the shell 201 is filled with electrolyte.

[0065] The end cap assembly 202 includes an end cap 202a and two terminals 202b. The end cap 202a is basically in the shape of a plate. The two terminals 202b are located on the plate surface of the end cap 202a and pass through the plate surface of the end cap 202a. The two terminals 202b are respectively a positive terminal and a negative terminal.

[0066] An explosion-proof valve 202c may also be provided on the flat surface of the end cap 202a, and the explosion-proof valve 202c may be a part of the flat surface of the end cap 202a, or may be welded to the flat surface of the end cap 202a. When the battery 300 generates too much gas, the gas expands and the gas pressure in the housing increases to a value exceeding a preset value, and the explosion-proof valve 202c is cracked, causing the inside and outside of the housing to communicate, and the gas is released outward through the crack of the explosion-proof valve 202c, thereby avoiding explosion.

[0067] The electrode assembly 100 includes a plurality of battery cells 101 arranged side by side and electrically connected to each other and a tab assembly 103 , wherein the tab assembly 103 is connected to the terminal 202 b and is formed by folding the tabs of the plurality of battery cells 101 .

[0068] The battery cell 101 includes a pole piece and a separator, wherein the pole piece includes an anode piece and a cathode piece. The anode piece and the cathode piece each include a current collector and a coating layer. The active material of the anode piece is coated on the current collector of the anode piece to form a coating layer, and the active material of the cathode piece is coated on the current collector of the cathode piece to form a coating layer. The separator is an insulator, which is arranged between the anode piece and the cathode piece, and the separator is used to separate the coating layer of the anode piece from the coating layer of the cathode piece. The anode piece, the separator and the cathode piece are stacked and wound in sequence to form the battery cell 101.

[0069] Since the shell 201 is made of metal materials such as aluminum, before the electrode assembly 100 is placed in the shell 201, it is necessary to cover the circumferential sides and bottom of the battery cell group composed of multiple battery cells 101 with insulating parts made of insulating materials to prevent the battery cells 101 from contacting the shell 201 and causing corrosion of the shell 201.

[0070] The inventors discovered that although the circumferential sides and bottom of the battery cell group of the electrode assembly 100 are covered with insulating parts, the battery cell 101 is still easy to contact with the shell 201 at the corner positions of the sides and bottom of the battery cell, causing corrosion of the shell 201, and in order to position and install the insulating parts, positioning holes need to be provided on the insulating parts. After the insulating parts cover the battery cell group, the positioning holes are generally located at the bottom of the battery cell group. Some active materials on the pole pieces will fall into the positioning holes, causing the shell 201 to overlap with the pole pieces, causing electrochemical corrosion to the shell 201.

[0071] Based on this, some embodiments of the present disclosure provide an assembly method for an insulating part for covering a battery cell, an electrode assembly, a battery cell, a battery, an electrical device and an electrode assembly. By improving the structure of the insulating part itself, it can cover the circumferential sides, bottom, corners between the sides and bottom, and positioning holes of the battery cell group, thereby alleviating the problem of shell corrosion.

[0072] refer to Figure 4 In some embodiments, the insulating member 102 for wrapping the battery cell includes a middle folding piece 3 , a first folding piece 1 , an extending piece 4 and a second folding piece 2 .

[0073] A positioning hole 31 is provided on the middle folding piece 3 .

[0074] The first fold piece 1 is connected to the middle fold piece 3 at the first fold line 51 . The first fold piece 1 includes a first main fold piece 11 and a side fold piece 12 connected to the first main fold piece 11 at a third fold line 53 . The third fold line 53 is perpendicular to the first fold line 51 .

[0075] The extension piece 4 is connected to one end of the side fold piece 12 close to the middle fold piece 3 at a fourth fold line 54 , and the fourth fold line 54 is perpendicular to the third fold line 53 .

[0076] The second folding piece 2 is connected to the middle folding piece 3 at a second folding line 52 , and the second folding line 52 is parallel to the first folding line 51 .

[0077] refer to Figure 5 , wherein the middle folding sheet 3 is configured to cover the bottom of the battery cell 101, the first folding sheet 1 and the second folding sheet 2 are configured to cover the circumferential side of the battery cell 101 after folding, and the extension sheet 4 is configured to completely cover the positioning hole 31 after folding.

[0078] The insulating member 102 is made of insulating material. Optionally, the insulating member 102 includes a polyester film or a polypropylene film.

[0079] Since the electrode assembly 100 includes a shell 201 and a battery cell 101 or multiple battery cells 101, and the shell 201 is made of aluminum, if the battery cell 101 or multiple battery cells 101 are directly placed in the shell 201, the battery cell 101 is easy to contact with the shell 201 and cause corrosion of the shell 201. If only the insulating member 102 covers the circumferential side and bottom of the battery cell 101, the corners of the side and bottom of the battery cell 101 will still have the problem of contact with the shell 201 and corrosion of the shell 201, and the battery cell 101 is easy to contact with the shell 201 and cause corrosion of the shell 201. 1, the active material on the pole piece will also fall from the corners of the side and bottom, causing the shell 201 to overlap with the pole piece, causing electrochemical corrosion to the shell 201. Furthermore, in order to realize mechanized and automated grasping and coating of the insulating member 102, a positioning hole 31 is required to be provided on the insulating member 102. After the insulating member 102 coats the battery cell 101, the positioning hole 31 is generally located at the bottom of the battery cell 101. The active material on the pole piece will also fall into the positioning hole 31, causing the shell 201 to overlap with the pole piece, causing electrochemical corrosion to the shell 201.

[0080] Based on this, in the embodiment of the present disclosure, the side folding piece 12 of the insulating member 102 is connected to the extension piece 4. After being folded, the extension piece 4 covers at least part of the corners of the side and bottom of the battery cell 101 and completely covers the positioning hole 31, thereby playing a role of insulation protection. It can prevent the side and bottom corners of the battery cell 101 and the part of the battery cell 101 at the positioning hole 31 from contacting the shell 201, and can catch the active material falling from the pole piece of the battery cell 101, to prevent the active material from falling onto the shell 201 and causing electrochemical corrosion to the shell 201, and has the function of protecting the performance and safety of the battery cell.

[0081] Furthermore, the middle folding piece 3 of the insulating part 102 in the embodiment of the present disclosure covers the bottom of the battery cell 101, and the first folding piece 1 and the second folding piece 2 cover the circumferential side of the battery cell 101 after being folded. Therefore, the insulating part 102 provided in the embodiment of the present disclosure can cover the circumferential side, bottom and corner areas between the side and bottom of the battery cell 101, and can also cover the positioning holes 31 set by itself, and can cover the battery cell 101 in all directions to prevent electrochemical corrosion of the shell 201.

[0082] In some embodiments, the insulating member 102 can be formed by cutting a whole piece of insulating material. The middle folding piece 3 and the extension piece 4 can be cut out by simply cutting the whole piece of insulating material, and then the insulating member 102 can be folded along the fold line to achieve all-round coverage of the battery cell 101. The preparation method of the insulating member 102 is simple and has good protective effect.

[0083] Optionally, the entire piece of insulating material is square.

[0084] Each fold line on the insulating member 102 in this embodiment may be a physical fold line, or may be formed by providing continuous dot holes on the insulating member 102 .

[0085] In some embodiments, the extension sheet 4 is configured to not exceed the area between the first fold line 51 and the second fold line 52 in the width direction of the middle fold sheet 3 after being folded along the fourth fold line 54 .

[0086] After the extension sheet 4 is folded, it does not exceed the area between the first fold line 51 and the second fold line 52 in the width direction of the middle fold sheet 3 , which is beneficial to ensure that the battery core 101 absorbs the electrolyte in the housing 201 .

[0087] When the extension piece 4 is formed by cutting on a whole piece of insulating material, the width of the extension piece 4 formed after cutting is smaller than the distance between the first fold line 51 and the second fold line 52. Therefore, there is no waste of material and no redundant parts that hinder the battery cell 101 coated with the insulating member 102 from being assembled into the shell. The electrolyte in the shell 201 can enter the battery cell 101 through the gap between the extension piece 4 and the first fold line 51, and the gap between the extension piece 4 and the second fold line 52, which is also conducive to ensuring that the battery cell 101 absorbs the electrolyte in the shell 201.

[0088] Since the width of the extension sheet 4 is smaller than the distance between the first fold line 51 and the second fold line 52, the extension sheet 4 covers part of the corners of the side and bottom of the battery cell 101 after being folded. The gap between the extension sheet 4 and the first fold line 51, and the gap between the extension sheet 4 and the second fold line 52 mainly refer to the corner parts of the side and bottom of the battery cell 101 not covered by the extension sheet 4.

[0089] In some embodiments, after being folded along the fourth fold line 54 , the extension sheet 4 is configured to have a distance of at least 2 mm from the first fold line 51 and a distance of at least 2 mm from the second fold line 52 in the width direction of the middle fold sheet 3 .

[0090] The maximum width W of the extension piece 4 is at least 4 mm smaller than the distance between the first fold line 51 and the second fold line 52, and the corresponding single-side gap is greater than or equal to 2 mm. The electrolyte in the shell 201 can enter the battery cell 101 through the gap between the extension piece 4 and the first fold line 51, and the gap between the extension piece 4 and the second fold line 52, which is beneficial to ensure that the battery cell 101 absorbs the electrolyte in the shell 201.

[0091] refer to Figure 6d In some embodiments, the extension sheet 4 is configured to cover at least a portion of the end of the battery cell 101 along the length direction after being folded along the fourth folding line 54 .

[0092] The battery cell 101 is formed by stacking and winding the anode sheet, the separator and the cathode sheet in sequence. Definition: The corner end of the battery cell 101 is the end in the length direction of the battery cell 101. The dimension between the two flat side surfaces of the battery cell 101 is the width dimension of the battery cell 101, and the dimension between the two elliptical end surfaces of the battery cell 101 is the height dimension of the battery cell 101.

[0093] After the battery cell 101 is placed in the shell 201, the end of the battery cell 101 in the length direction is easy to contact with the shell 201, and active materials are easy to fall off. The extension sheet 4 is folded to cover the end of the battery cell 101 along the length direction, which can prevent the end of the battery cell 101 in the length direction from contacting with the shell 201, and can catch the active materials falling from the end of the battery cell 101 along the length direction, thereby preventing the active materials from falling into the shell 201 and causing electrochemical corrosion to the shell 201.

[0094] refer to Figure 7d and Figure 8d In some embodiments, there are multiple battery cells 101 , and the extension sheet 4 is configured to cover at least a portion of the end portion of each battery cell 101 along the length direction after being folded along the fourth fold line 54 .

[0095] The battery cell 101 is formed by stacking and winding an anode sheet, an isolation membrane and a cathode sheet in sequence. The corner end of the battery cell 101 is the end of the battery cell 101 in the length direction. After multiple battery cells 101 are placed in the shell 201, the ends of the battery cells 101 in the length direction are easy to contact with the shell 201, and active substances are easy to fall off. The extension sheet 4 is folded to cover the end of each battery cell 101 along the length direction, which can prevent the ends of each battery cell 101 in the length direction from contacting the shell 201, and can catch the active substances falling from the ends of each battery cell 101 along the length direction, thereby preventing the active substances from falling into the shell 201 and causing electrochemical corrosion of the shell 201.

[0096] Regardless of whether the insulating member 102 covers one battery cell 101 or more than two battery cells 101, the ends of each battery cell 101 in the length direction are generally located in the middle area in the width direction of the middle folded sheet 3. The extension sheet 4 is configured to be located in the middle area in the width direction of the middle folded sheet 3 after being folded along the fourth folding line 54, and the extension sheet 4 can cover the ends of each battery cell 101 in the length direction.

[0097] refer to Figure 6a , Figure 6b , Figure 6c and Figure 6dIn some embodiments, a battery cell 101 is wrapped in the insulating member 102, the width of the extension sheet 4 is less than the width of the battery cell 101, and the extension sheet 4 is located in the middle area of ​​the width direction of the middle folding sheet 3 after folding, and the end of the battery cell 101 in the length direction is generally also located in the middle area of ​​the width direction of the middle folding sheet 3. Optionally, the width of the extension sheet 4 is not less than 1 / 2 of the width of the battery cell 101, that is, W≥(1 / 2)H, wherein W is the width of the extension sheet 4, and H is the width of a single battery cell 101, so as to cover the end of the battery cell 101 along the length direction.

[0098] refer to Figure 7a , Figure 7b , Figure 7c and Figure 7d In some embodiments, the insulating member 102 wraps two battery cells 101, and the extension sheet 4 is folded and located in the middle area of ​​the width direction of the middle folding sheet 3. Optionally, the width of the extension sheet 4 is not less than 2 / 3 of the total width of the two battery cells 101, that is, W≥(2 / 3)2H, wherein W is the width of the extension sheet 4, and H is the width of a single battery cell 101.

[0099] refer to Figure 8a , Figure 8b , Figure 8c and Figure 8d In some embodiments, four battery cells 101 are wrapped in the insulating member 102, and the extension sheet 4 is located in the middle area of ​​the width direction of the middle folding sheet 3 after being folded. Optionally, the width of the extension sheet 4 is not less than 4 / 5 of the total width of the four battery cells 101, that is: W≥(4 / 5)4H, wherein W is the width of the extension sheet 4, and H is the width of a single battery cell 101.

[0100] In some embodiments, the insulating member 102 wraps n battery cells 101, and the extension sheet 4 is folded and located in the middle area of ​​the width direction of the middle folded sheet 3, and the width of the extension sheet 4 is not less than n / (n+1) of the total width of the n battery cells 101, that is, W≥(n / (n+1))nH. Wherein, n is the number of battery cells 101 wrapped by the insulating member 102, and n is an integer greater than 0, W is the width of the extension sheet 4, and H is the width of a single battery cell 101.

[0101] In some embodiments, n battery cells 101 are wrapped in the insulating member 102, and the extension sheet 4 is located in the middle area of ​​the width direction of the middle folding sheet 3 after being folded. The width of the extension sheet 4 is at least greater than the width of n-1 battery cells, wherein n is the number of battery cells 101 wrapped by the insulating member 102, and n is an integer greater than 0.

[0102] In some embodiments, the length direction of the extension piece 4 is defined to be perpendicular to the fourth fold line 54, and the length of the extension piece 4 is defined to be L, which is not greater than the distance between the first fold line 51 and the second fold line 52. The width of the extension piece 4 is defined to be W.

[0103] Since the extension sheet 4 covers the positioning hole 31 after being folded, the length L of the extension sheet 4 is not greater than the distance between the first fold line 51 and the second fold line 52 , and the positioning hole 31 can be positioned.

[0104] When the extension piece 4 is formed by cutting from a whole piece of insulating material, the length of the extension piece 4 formed after cutting will naturally be smaller than the distance between the first fold line 51 and the second fold line 52. Therefore, in order to make full use of the whole piece of insulating material, the location of the positioning hole 31 should meet the requirement of covering the positioning hole 31 after the extension piece 4 is folded.

[0105] In some embodiments, the length L of the extension sheet 4 is greater than s+d+x, where s is the minimum distance between the positioning hole 31 and the fourth fold line 54 after the extension sheet 4 is folded along the fourth fold line 54, d is the diameter of the positioning hole 31, and x is not less than 2 mm.

[0106] The length L of the extension piece 4>s+d+x can ensure that the extension piece 4 completely covers the positioning hole 31 .

[0107] When the extension piece 4 is formed by cutting a whole piece of insulating material, the maximum length L of the extension piece is equal to the width of the middle folded piece 3 .

[0108] In some embodiments, the side flap 12 includes a first side flap 12a and a second side flap 12b, and both the first side and the second side of the first main flap 11 have a third fold line 53 .

[0109] The first side flap 12 a is connected to the first main flap 11 at a third fold line 53 on a first side of the first main flap 11 .

[0110] The second side flap 12 b is connected to the first main flap 11 at a third fold line 53 on a second side of the first main flap 11 .

[0111] The extension piece 4 includes a first extension piece 41 and a second extension piece 42 . The first side fold piece 12 a and the second side fold piece 12 b both have a fourth fold line 54 at one end close to the middle fold piece.

[0112] The first extension piece 41 is connected to the first side flap 12a at a fourth fold line 54 on the first side flap 12a.

[0113] The second extension piece 42 is connected to the second side flap 12b at a fourth fold line 54 on the second side flap 12b.

[0114] The positioning holes 31 include a first positioning hole 31 a and a second positioning hole 31 b , and the battery cell includes a first side portion, a second side portion, and a bottom portion.

[0115] The first extension sheet 41 is configured to wrap around at least a portion of the corners of the first side and bottom of the battery cell after being folded, and completely cover the first positioning hole 31 a.

[0116] The second extending piece 42 is configured to wrap around at least a portion of the corners of the second side and bottom of the battery cell after being folded, and completely cover the second positioning hole 31 b.

[0117] A first side folding piece 12a and a second side folding piece 12b are respectively provided on both sides of the first main folding piece 11, and the first side folding piece 12a and the second side folding piece 12b are used to cover the two end side parts of the battery cell 101 in the length direction. The first side folding piece 12a is connected to the first extension piece 41, and the second side folding piece 12b is connected to the second extension piece 42. The first extension piece 41 and the second extension piece 42 can cover the corners of the two end side parts and the bottom of the battery cell 101, and in order for the mechanical device to automatically grab the insulating member 102 when the insulating member 102 covers the battery cell 101, and it is convenient to operate and cover the insulating member 102, two positioning holes 31 are provided on the insulating member 102, and the first extension piece 41 and the second extension piece 42 can cover one positioning hole 31 respectively, so as to achieve all-round covering of the battery cell 101.

[0118] In some embodiments, the second fold piece 2 includes a second main fold piece 21 and a lap piece 22 connected to the second main fold piece 21 at the fifth fold line 55. The lap piece 22 and the side fold piece 12 are configured to overlap each other after folding, and the fifth fold line 55 is perpendicular to the second fold line 52.

[0119] After being folded, the overlapping pieces 22 and the side folding pieces 12 can completely cover the two end sides of the battery cell 101 in the length direction. The middle folding piece 3 covers the bottom of the battery cell 101. The first main folding piece 11 and the second main folding piece 21 can cover the two side parts of the battery cell 101 in the width direction after being folded, so as to achieve all-round covering of the battery cell 101.

[0120] In some embodiments, the overlapping piece 22 includes a first overlapping piece 22a and a second overlapping piece 22b, and the first side and the second side of the second main flap 21 both have a fifth fold line 55 .

[0121] The first overlapping piece 22a is connected to the second main flap 21 at the fifth fold line 55 on the first side of the second main flap 21. The first overlapping piece 22a is configured to overlap with the first side flap 12a after being folded.

[0122] The second overlapping piece 22b is connected to the second main flap 21 at the fifth fold line 55 on the second side of the second main flap 21. The second overlapping piece 22b is configured to overlap with the second side flap 12b after being folded.

[0123] Some embodiments further provide an electrode assembly 100 , which includes at least one battery cell 101 and the above-mentioned insulating member 102 , wherein the insulating member 102 is folded to cover at least a portion of a surface of the at least one battery cell 101 .

[0124] The electrode assembly 100 includes the insulating member 102 provided in the embodiment of the present disclosure, and correspondingly possesses the beneficial effects of the insulating member 102 provided in the embodiment of the present disclosure, which will not be elaborated herein.

[0125] Some embodiments further provide a battery cell 200 , which includes a housing 201 and the electrode assembly 100 described above, wherein the electrode assembly 100 is disposed in the housing 201 .

[0126] The battery cell 200 includes the electrode assembly 100 provided in the embodiment of the present disclosure, and correspondingly has the beneficial effects of the electrode assembly 100 provided in the embodiment of the present disclosure, which will not be elaborated here.

[0127] Some embodiments further provide a battery 300 , which includes a box body 301 and at least one of the above-mentioned battery cells 200 , wherein the battery cell 200 is disposed in the box body 301 .

[0128] The battery 300 includes the battery cell 200 provided in the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery cell 200 provided in the embodiment of the present disclosure, which will not be described in detail here.

[0129] Some embodiments further provide an electrical device, which includes the battery 300 described above.

[0130] The electrical device includes the battery 300 provided in the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery 300 provided in the embodiment of the present disclosure, which will not be elaborated here.

[0131] Optionally, the electric device includes a vehicle 400 .

[0132] Some embodiments further provide a method for assembling an electrode assembly, comprising the following steps:

[0133] Providing at least one battery cell 101;

[0134] An insulating member 102 is provided, and the insulating member 102 includes: a middle folded piece 3, on which a positioning hole 31 is provided; a first folded piece 1, connected to the middle folded piece 3 at a first fold line 51, the first folded piece 1 includes a first main folded piece 11, and a side folded piece 12 connected to the first main folded piece 11 at a third fold line 53, and the third fold line 53 is perpendicular to the first fold line 51; an extension piece 4, connected to an end of the side folded piece 12 close to the middle folded piece 3 at a fourth fold line 54, and the fourth fold line 54 is perpendicular to the third fold line 53; and a second folded piece 2, connected to the middle folded piece 3 at a second fold line 52, and the second fold line 52 is parallel to the first fold line 51;

[0135] Placing at least one battery cell 101 on the middle folded sheet 3 and sequentially arranging them along the direction between the first folded line 51 and the second folded line 52 so that the middle folded sheet 3 covers the bottom of at least one battery cell 101; and

[0136] The first folded sheet 1 and the second folded sheet 2 are folded so that the first folded sheet 1 and the second folded sheet 2 cover the circumferential side of at least one battery cell 101 , and the extending sheet 4 is folded so that the extending sheet 4 completely covers the positioning hole 31 .

[0137] The middle folding piece 3 covers the bottom of the battery cell 101, the first folding piece 1 and the second folding piece 2 cover the circumferential side of the battery cell 101, the extension piece 4 covers at least part of the corners of the side and bottom of the battery cell 101, and completely covers the positioning hole 31, and the insulating part 102 can cover the circumferential side, bottom and corner area of ​​the side and bottom of the battery cell 101, and can also cover the positioning hole 31 set by itself, and can cover the battery cell 101 in all directions to prevent electrochemical corrosion of the shell 201.

[0138] The following is combined with Figures 3 to 8d Some specific embodiments of the insulating member 102 are described in detail.

[0139] like Figure 4 As shown, the insulating member 102 for covering the battery core includes a middle folded sheet 3 , a first folded sheet 1 , an extending sheet 4 and a second folded sheet 2 .

[0140] The first folding piece 1 is connected to the middle folding piece 3 at the first folding line 51, and the second folding piece 2 is connected to the middle folding piece 3 at the second folding line 52. The middle folding piece 3 is provided with a first positioning hole 31a and a second positioning hole 31b.

[0141] The first flap 1 includes a first main flap 11, a first side flap 12a, and a second side flap 12b, wherein the first side and the second side of the first main flap 11 both have a third fold line 53. The first side flap 12a is connected to the first main flap 11 at the third fold line 53 on the first side of the first main flap 11. The second side flap 12b is connected to the first main flap 11 at the third fold line 53 on the second side of the first main flap 11.

[0142] The extension piece 4 includes a first extension piece 41 and a second extension piece 42. The first side fold piece 12a and the second side fold piece 12b have a fourth fold line 54 at one end close to the middle fold piece. The first extension piece 41 is connected to the first side fold piece 12a at the fourth fold line 54 on the first side fold piece 12a. The second extension piece 42 is connected to the second side fold piece 12b at the fourth fold line 54 on the second side fold piece 12b.

[0143] The second flap 2 includes a second main flap 21, a first lap piece 22a and a second lap piece 22b, and the first side and the second side of the second main flap 21 both have a fifth fold line 55. The first lap piece 22a is connected to the second main flap 21 at the fifth fold line 55 on the first side of the second main flap 21. The second lap piece 22b is connected to the second main flap 21 at the fifth fold line 55 on the second side of the second main flap 21.

[0144] After the insulating member 102 is folded, the middle folding piece 3 covers the bottom of the battery cell 101, and the first main folding piece 11 and the second main folding piece 21 cover the two side portions of the battery cell 101 in the width direction; the first overlapping piece 22a and the first side folding piece 12a overlap each other, and the second overlapping piece 22b and the second side folding piece 12b overlap each other to cover the two side portions (the first side portion and the second side portion) in the length direction of the battery cell 101; the first extending piece 41 covers the first side portion and at least part of the corner of the bottom of the battery cell, and completely covers the first positioning hole 31a; the second extending piece 42 covers the second side portion and at least part of the corner of the bottom of the battery cell, and completely covers the second positioning hole 31b.

[0145] like Figure 5 FIG. 4 shows the folding process of the insulating member 102. Figure 5 a shows the expanded state of the insulating member 102; Figure 5 b shows the folding of the first main flap 11 and the second main flap 21; Figure 5 As shown in c, the first overlapping piece 22a and the first side folding piece 12a are folded and overlapped with each other, the second overlapping piece 22b and the second side folding piece 12b are folded and overlapped with each other, and the first extension piece 41 and the second extension piece 42 are folded to complete the folding of the insulating member 102.

[0146] like Figure 6a As shown, there is a battery cell 101 and an end cap assembly 202; Figure 6b , Figure 6c and Figure 6d As shown, the insulating member 102 covers a battery cell 101 .

[0147] like Figure 7a As shown, there are two battery cells 101 and an end cap assembly 202; Figure 7b , Figure 7c and Figure 7d As shown, the insulating member 102 covers the two battery cells 101 .

[0148] like Figure 8a As shown, there are four battery cells 101 and an end cap assembly 202; Figure 8b , Figure 8c and Figure 8d As shown, the insulating member 102 covers the four battery cells 101 .

[0149] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An insulating member for covering a battery core, characterized in that: include: A middle folding piece (3) having a positioning hole (31) thereon; A first folding piece (1) connected to the middle folding piece (3) at a first folding line (51), the first folding piece (1) comprising a first main folding piece (11) and a side folding piece (12) connected to the first main folding piece (11) at a third folding line (53), the third folding line (53) being perpendicular to the first folding line (51); an extension piece (4) connected to one end of the side fold piece (12) close to the middle fold piece (3) at a fourth fold line (54), wherein the fourth fold line (54) is perpendicular to the third fold line (53); and A second folding piece (2) connected to the middle folding piece (3) at a second folding line (52), wherein the second folding line (52) is parallel to the first folding line (51); The middle folding sheet (3) is configured to cover the bottom of the battery core (101), the first folding sheet (1) and the second folding sheet (2) are configured to cover the circumferential side of the battery core (101) after being folded, and the extension sheet (4) is configured to completely cover the positioning hole (31) after being folded.

2. The insulating member according to claim 1, characterized in that The extension sheet (4) is configured so that after being folded along the fourth folding line (54), it does not exceed the area between the first folding line (51) and the second folding line (52) in the width direction of the middle folding sheet (3).

3. The insulating member according to claim 1, characterized in that: The extension sheet (4) is configured such that after being folded along the fourth fold line (54), in the width direction of the middle fold sheet (3), the distance between the extension sheet (4) and the first fold line (51) is at least 2 mm, and the distance between the extension sheet (4) and the second fold line (52) is at least 2 mm.

4. The insulating member according to claim 1, characterized in that: The extension sheet (4) is configured to cover at least a portion of the end of the battery cell (101) along the length direction after being folded along the fourth folding line (54).

5. The insulating member according to claim 1, characterized in that: There are a plurality of battery cells (101), and the extension sheet (4) is configured to cover at least a portion of an end portion of each battery cell (101) along a length direction after being folded along the fourth folding line (54).

6. The insulating member according to claim 1, characterized in that: The length direction of the extension piece (4) is defined to be perpendicular to the fourth fold line (54), and the length of the extension piece (4) is defined to be L, which is not greater than the distance between the first fold line (51) and the second fold line (52).

7. The insulating member according to claim 6, characterized in that: The length L of the extension piece (4) is greater than s+d+x, wherein s is the minimum distance between the positioning hole (31) and the fourth fold line (54) after the extension piece (4) is folded along the fourth fold line (54), d is the diameter of the positioning hole (31), and x is not less than 2 mm.

8. The insulating member according to any one of claims 1 to 7, characterized in that: The side folding piece (12) comprises a first side folding piece (12a) and a second side folding piece (12b), and the first side and the second side of the first main folding piece (11) both have a third folding line (53); The first side flap (12a) is connected to the first main flap (11) at a third fold line (53) on the first side of the first main flap (11); The second side flap (12b) is connected to the first main flap (11) at a third fold line (53) on the second side of the first main flap (11); The extension piece (4) comprises a first extension piece (41) and a second extension piece (42); the first side fold piece (12a) and the second side fold piece (12b) both have a fourth fold line (54) at one end close to the middle fold piece; The first extension piece (41) is connected to the first side fold piece (12a) at a fourth fold line (54) on the first side fold piece (12a); The second extension piece (42) is connected to the second side fold piece (12b) at a fourth fold line (54) on the second side fold piece (12b); The positioning hole (31) comprises a first positioning hole (31a) and a second positioning hole (31b), and the battery core comprises a first side portion, a second side portion and a bottom portion; The first extension sheet (41) is configured to cover at least a portion of the corners of the first side and bottom of the battery cell after being folded, and completely cover the first positioning hole (31a); The second extension sheet (42) is configured to wrap around at least a portion of the corners of the second side and bottom of the battery cell after being folded, and completely cover the second positioning hole (31b).

9. The insulating member according to any one of claims 1 to 7, characterized in that: The second folding piece (2) comprises a second main folding piece (21), and a lap piece (22) connected to the second main folding piece (21) at a fifth folding line (55), wherein the lap piece (22) and the side folding piece (12) are configured to overlap each other after being folded, and the fifth folding line (55) is perpendicular to the second folding line (52).

10. An electrode assembly, characterized in that: The invention comprises at least one battery cell (101), and an insulating member (102) according to any one of claims 1 to 9, wherein the insulating member (102) is folded to cover at least a part of a surface of the at least one battery cell (101).

11. A battery cell, characterized in that: It comprises a shell (201) and an electrode assembly (100) according to claim 10, wherein the electrode assembly (100) is arranged in the shell (201).

12. A battery, characterized in that: It comprises a box body (301) and at least one battery cell (200) according to claim 11, wherein the battery cell (200) is arranged in the box body (301).

13. An electrical device, characterized in that: Comprising a battery (300) according to claim 12.

Images