WO2024016452A1

WO2024016452A1 - Separator, battery cell, hot-pressing mold, battery, and electric device

Info

Publication number: WO2024016452A1
Application number: PCT/CN2022/118487
Authority: WO
Inventors: 刘桓基
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-07-19
Filing date: 2022-09-13
Publication date: 2024-01-25
Also published as: CN217589312U

Abstract

Provided in the present application are a separator, a battery cell, a hot-pressing mold, a battery, and an electric device. The present application belongs to the technical field of batteries. The separator comprises a substrate and second bonding layers. The substrate has two first regions and a second region, wherein in the width direction of the substrate, the second region is located between the two first regions; the second bonding layers are arranged on two opposite surfaces, in a thickness direction, of either of the two first regions of the substrate; and the bonding force of the second bonding layers is greater than or equal to 1 N/m and less than or equal to 40 N/m. The second bonding layers are arranged on the separator; after electrode plates are completely manufactured, the electrode plates are stacked or curled, and thus the second bonding layers on the separator are stacked; and the two surfaces of the substrate are provided with the second bonding layers, so that separators stacked together can be bonded together by means of their own second bonding layers, so as to fix the separators, thus avoiding a battery short circuit caused by shrinkage of the separators.

Description

Separators, battery cells, hot pressing molds, batteries and electrical devices

cross reference

This application cites Chinese patent application No. 202221853206.5 titled "Separator, Battery Cell, Hot Pressing Mold, Battery and Electrical Device" submitted on July 19, 2022, which is fully incorporated into this application by reference.

Technical field

This application relates to the field of battery technology, and in particular to a separator, a battery cell, a hot pressing mold, a battery and an electrical device.

Background technique

With the rapid development of new energy technology, batteries are widely used in electronic equipment, such as mobile phones, laptops, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, etc. .

The battery cell includes an anode plate, a separator and a cathode plate. The separator is located between the anode plate and the cathode plate. The separator separates the anode and cathode plates to prevent direct contact between the anode and cathode to cause a short circuit in the battery.

The battery will emit heat during use, and the separator will shrink when heated, which can easily cause the positive and negative poles of the battery to come into direct contact and cause a short circuit in the battery.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the background art. To this end, one object of the present application is to provide a separator, a battery cell, a hot-pressing mold, a battery, and an electrical device to solve the problem of a short circuit in the battery caused by thermal shrinkage of the separator.

An embodiment of the first aspect of the present application provides a separator. The separator includes: a base material having two first areas and a second area. The second area is located between the two first areas in the width direction of the base material. ; The second adhesive layer is disposed on the two opposite surfaces of each of the two first areas of the base material along the thickness direction. The adhesive force of the second adhesive layer is greater than or equal to 1N/m and less than or equal to 1N/m. Equal to 40N/m.

Arrange the second adhesive layer on the separator. After the pole pieces are made, stack or curl the pole pieces. The second adhesive layer on the separator will be laminated. Both surfaces of the base material have the second adhesive layer. This stacking The separators that are together can be bonded together through their own second adhesive layer to fix the separators and avoid battery short circuit due to shrinkage of the separators. The adhesive force of the second adhesive layer is greater than or equal to 1N/m and less than or equal to 40N/m, which ensures the adhesive force of the second adhesive layer and prevents the separator from coming off.

In some embodiments, the adhesive force of the second adhesive layer is greater than or equal to 5 N/m and less than or equal to 40 N/m. The adhesive force of the second adhesive layer is further limited to ensure the adhesion between the separators and achieve effective fixation of the separators.

In some embodiments, the width of the second adhesive layer is less than or equal to 20 mm in the width direction of the substrate. Ensure that there is a second adhesive layer on the base material that can be used to fix the diaphragm, and at the same time, avoid the width of the second adhesive layer being too wide, which will affect the size of the diaphragm.

In some embodiments, the width of the second adhesive layer is greater than or equal to 7 mm and less than or equal to 11 mm in the width direction of the substrate. Further limiting the width of the second adhesive layer not only ensures the fixing effect on the diaphragm, but also avoids affecting the size of the diaphragm.

In some embodiments, the separator further includes: a first insulating layer disposed on two opposite surfaces of the second region of the substrate along the thickness direction, and the first insulating layer includes adhesive glue and ceramic slurry. The first insulating layer is used to ensure the insulation of the separator and prevent the cathode and anode plates from being in direct contact and causing a battery short circuit. Ceramic slurry is a commonly used insulating material with good insulation properties. The adhesive glue and ceramic slurry are mixed to ensure that the ceramic slurry can be bonded to the base material.

In some embodiments, the separator further includes: a second insulating layer, which is disposed on two opposite surfaces of the base material in the thickness direction and completely covers both surfaces of the base material. In the thickness direction of the base material, the second insulating layer is located Between the second adhesive layer and the base material, the second insulating layer includes adhesive glue and ceramic slurry. The second insulating layer is used to ensure the insulation of the separator and prevent the cathode and anode plates from being in direct contact and causing a battery short circuit. Ceramic slurry is a commonly used insulating material with good insulation properties. The adhesive glue and ceramic slurry are mixed to ensure that the ceramic slurry can be bonded to the base material.

The second embodiment of the present application provides a battery cell. The battery cell includes a pole piece and the separator in the above embodiment. The second adhesive layers of the two separators located on both sides of the same pole piece are fixed together.

In the technical solution of the embodiment of the present application, the separators stacked together can be bonded together through a second adhesive layer to fix the separators. As a result, the separator in the battery cell can be effectively fixed. When the separator is heated, the separator will not shrink, so that the separator can separate the cathode and anode tabs and avoid direct contact between the cathode and anode tabs to cause a battery short circuit.

In some embodiments, the second adhesive layer fixed together is located on both sides of the active material layer of the pole piece in the width direction of the separator substrate. This prevents the second adhesive layer from affecting the active material layer and thus affecting the performance of the battery.

A third embodiment of the present application provides a hot-pressing mold. The hot-pressing mold is used to produce the battery cell in the above embodiment. The hot-pressing mold includes: a first splint; at least two first bumps; at least two first bumps; The first protrusions are all located on the same first surface of the first plywood, and in the width direction of the first plywood, some of the at least two first protrusions are disposed close to a certain side of the first surface, and the other part is disposed close to The other side of the first surface is provided, wherein one side and the other side are opposite sides of the first surface, so that when making the battery cell, the positions of at least two first bumps are in line with the second The position of the adhesive layer corresponds.

In the technical solution of the embodiment of the present application, pressure can be applied to the diaphragm and the pole piece through the first bump on the first plywood. Under the action of heat, the second adhesive layer on the diaphragm is thermally compounded and bonded together to prevent The diaphragm shrinks at high temperatures.

In some embodiments, the hot pressing mold further includes: a second plywood, opposite to the first plywood; at least two second protrusions, the at least two second protrusions are located on the same second surface of the second plywood, and the One surface is opposite to the second surface, and the positions of at least two second bumps correspond to the positions of at least two first bumps. The first bump and the second bump on the hot pressing mold simultaneously apply pressure to the diaphragm and the pole piece. Under the action of heat, the second adhesive layer on the diaphragm is thermally compounded and bonded together to prevent the diaphragm from shrinking at high temperatures. .

An embodiment of the fourth aspect of the present application provides a battery. The battery includes at least two battery cells in the above embodiment.

An embodiment of the fifth aspect of the present application provides an electric device. The electric device includes the battery in the above embodiment, and the battery is used to provide electric energy.

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical means of the present application, they can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable. , the specific implementation methods of the present application are specifically listed below.

Description of drawings

In the drawings, unless otherwise specified, the same reference numbers refer to the same or similar parts or elements throughout the several figures. The drawings are not necessarily to scale. It should be understood that these drawings depict only some embodiments disclosed in accordance with the present application and should not be considered as limiting the scope of the present application.

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

Figure 2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

Figure 3 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

Figure 4 is a top view of a current collector provided by some embodiments of the present application;

Figure 5 is a schematic cross-sectional view of a current collector provided by some embodiments of the present application;

Figure 6 is a schematic cross-sectional view of a current collector provided by some embodiments of the present application;

Figure 7 is a schematic cross-sectional view of a current collector provided by some embodiments of the present application;

Figure 8 is a top view of the pole piece provided by some embodiments of the present application;

Figure 9 is a schematic cross-sectional view of a pole piece provided by some embodiments of the present application;

Figure 10 is a schematic diagram of the pole piece manufacturing process provided by some embodiments of the present application;

Figure 11 is a top view of a separator provided by some embodiments of the present application;

Figure 12 is a cross-sectional view of a separator provided by some embodiments of the present application;

Figure 13 is a cross-sectional view of a separator provided by some embodiments of the present application;

Figure 14 is a cross-sectional view of a pole piece provided by some embodiments of the present application;

Figure 15 is a cross-sectional view of a pole piece provided by some embodiments of the present application;

Figure 16 is a cross-sectional view of the cooperation between the pole piece and the diaphragm provided by some embodiments of the present application;

Figure 17 is a structural diagram of a hot pressing mold provided by some embodiments of the present application;

Figure 18 is a structural diagram of the hot pressing mold provided by some embodiments of the present application from another perspective;

Figure 19 is a front view of a hot pressing mold provided by some embodiments of the present application;

FIG. 20 is a cross-sectional view along the C-C plane in FIG. 19 .

Detailed ways

The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity or specificity of the indicated technical features. Sequence or priority relationship. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

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

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to It is more than two pieces (including two pieces).

In the description of the embodiments of this application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back" , "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", " The orientations or positional relationships indicated by "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply the devices or devices referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation, and therefore are not to be construed as limitations on the embodiments of the present application.

In the description of the embodiments of this application, unless otherwise explicitly stated and limited, technical terms such as "installation", "connection", "connection", and "fixing" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It can be detachably connected or integrated; it can also be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements. . For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

At present, judging from the development of the market situation, 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 are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

The applicant noticed that the temperature of the battery will increase during use. As the temperature of the battery increases, the battery may short-circuit. The applicant found through research that at high temperatures, short circuits in most batteries are caused by direct contact between the cathode and anode plates in the battery. A separator is arranged between the anode and cathode tabs in the battery cell. The separator separates the anode and cathode tabs. However, as the battery is used, the temperature of the battery will inevitably increase, and the separator will heat up after being heated. It will shrink. After the separator shrinks, it cannot effectively separate the cathode and anode plates, causing direct contact between the anode and cathode plates, causing the battery to short-circuit.

At the same time, when one of the battery cells is short-circuited, the temperature of the short-circuited battery cell will increase, which will affect the adjacent battery cells and may also cause the adjacent battery cells to short-circuit. This phenomenon is called thermal diffusion.

The pole piece includes a current collector and an active material arranged on the current collector. In order to alleviate the short circuit problem of the battery at high temperature, the applicant designed a current collector and a separator after in-depth research, and arranged them on both The first adhesive layer and the second adhesive layer fix the separator through the first adhesive layer or the second adhesive layer. Even if the battery temperature rises, the separator cannot move after being heated, which can effectively separate the cathode plates. and anode plates to avoid battery short circuit due to separator shrinkage.

The battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircrafts. The power supply system of the electrical device composed of the battery cells and batteries disclosed in this application can be used to improve the stability of battery performance and battery life.

Embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

For the convenience of explanation in the following embodiments, an electric device 1000 according to an embodiment of the present application is used as an example.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 . The vehicle 1000 may also include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .

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

Please refer to FIG. 2 , which is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a case 10 and battery cells 20 , and the battery cells 20 are accommodated in the case 10 . Among them, the box 10 is used to provide an accommodation space for the battery cells 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 101 and a second part 102 , the first part 101 and the second part 102 cover each other, and the first part 101 and the second part 102 jointly define a space for accommodating the battery cells 20 of accommodation space. The second part 102 may be a hollow structure with one end open, and the first part 101 may be a plate-like structure. The first part 101 covers the open side of the second part 102 so that the first part 101 and the second part 102 jointly define a receiving space. ; The first part 101 and the second part 102 may also be hollow structures with one side open, and the open side of the first part 101 is covered with the open side of the second part 102. Of course, the box 10 formed by the first part 101 and the second part 102 can be in various shapes, such as a cylinder, a cuboid, etc.

In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the battery 100 can also be a plurality of battery cells 20 First, the battery modules are connected in series, parallel, or mixed to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 . The battery 100 may also include other structures. For example, the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells 20 .

Each battery cell 20 may be a secondary battery or a primary battery; it may also 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.

Please refer to FIG. 3 , which is an exploded structural diagram of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. As shown in FIG. 3 , the battery cell 20 includes an end cover 201 , a housing 202 , a battery cell assembly 203 and other functional components.

The end cap 201 refers to a component that covers the opening of the case 202 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 201 can be adapted to the shape of the housing 202 to fit the housing 202 . In some embodiments, the end cap 201 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 201 is less likely to deform when subjected to extrusion and collision, so that the battery cell 20 can have better performance. With high structural strength, safety performance can also be improved. Functional components such as electrode terminals 2011 may be provided on the end cap 201 . The electrode terminal 2011 may be used to electrically connect with the battery cell assembly 203 for outputting or inputting electrical energy of the battery cell 20 . In some embodiments, the end cap 201 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 201 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application. In some embodiments, an insulating member may also be provided inside the end cover 201, and the insulating member may be used to isolate the electrical connection components in the housing 202 from the end cover 201 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

The housing 202 is a component used to cooperate with the end cover 201 to form an internal environment of the battery cell 20 , wherein the formed internal environment can be used to accommodate the battery cell assembly 203 , electrolyte, and other components. The housing 202 and the end cover 201 may be independent components, and an opening may be provided on the housing 202. The end cover 201 covers the opening at the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 201 and the shell 202 can also be integrated. Specifically, the end cap 201 and the shell 202 can form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the inside of the shell 202 When the end cap 201 is closed, the housing 202 is closed. The housing 202 can be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shape of the housing 202 can be determined according to the specific shape and size of the battery cell assembly 203 . The housing 202 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.

The battery cell assembly 203 is a component in the battery cell 20 where electrochemical reactions occur. One or more battery cell assemblies 203 may be contained within the housing 202 . The battery cell assembly 203 is mainly formed by winding or stacking an anode electrode sheet and a cathode electrode sheet, and a separator is usually provided between the anode electrode sheet and the cathode electrode sheet. The portions of the anode and cathode plates that contain active material constitute the main body of the battery cell assembly, and the portions of the anode and cathode plates that do not contain active material each constitute the battery tab 2031 . The anode tab and the cathode tab can be located together at one end of the main body or respectively at both ends of the main body. During the charging and discharging process of the battery, the anode active material and the cathode active material react with the electrolyte, and the battery tabs 2031 are connected to the electrode terminals to form a current loop.

According to some embodiments of the present application, please refer to FIGS. 4 and 5 . FIG. 4 is a top view of a current collector provided by some embodiments of the present application, and FIG. 5 is a schematic cross-sectional view of a current collector provided by some embodiments of the present application. The embodiment of the present application provides a current collector 11 including a current collector body 111 and a first adhesive layer 112 . Among them, the current collector body 111 has an active material area 1111, a tab area 1112 and a glue coating area 1113. The tab area 1112 is located on one side of the active material area 1111, and the glue coating area 1113 is located between the active material area 1111 and the tab area 1112. and the other side of the active material region 1111 opposite to the tab region 1112 . The first adhesive layer 112 is disposed in the glue coating area 1113. The adhesive force of the first adhesive layer 112 is greater than or equal to 1 Newton per meter (N/m) and less than or equal to 40 N/m. The first adhesive layer 112 is For bonding to the separator of the battery cell.

In the embodiment of this application, the current collector 11 refers to a structure or part that collects current. When the current collector 11 is applied to the pole piece 1 of the battery, the main function of the current collector 11 is to connect the powdery active materials through coating. , the current generated by the active material is collected and output, and the electrode current is input to the active material.

The current collector body 111 is the carrier of the current collector 11, which mainly refers to a metal foil in a lithium-ion battery. For lithium batteries, the current collector body 111 of the anode plate is usually made of aluminum foil. Aluminum foil has serious corrosion problems at low potentials and is mainly used for anode plates. The current collector body 111 of the cathode plate is usually made of copper foil. Since copper foil is easily oxidized at a higher potential, it is mainly used for cathode plates with lower potential.

The active material area 1111 is used for arranging the active material layer 12 , the glue coating area 1113 is used for arranging the first adhesive layer 112 , and the tab area 1112 is used for arranging the tabs 13 . In the embodiment of the present application, the active material area 1111 is quadrilateral, and the glue-coating areas 1113 are located on opposite sides of the active material area 1111. That is, the current collector body 111 has two glue-coating areas 1113, one of which is located on the active material area 1113. Between material area 1111 and tab area 1112.

The first adhesive layer 112 is located in the glue coating area 1113, that is, the first adhesive layer 112 is located on opposite sides of the active material area 1111. The adhesive force of the first adhesive layer 112 is greater than or equal to 1 N/m and less than or equal to 40N/m, ensuring the adhesive force of the first adhesive layer 112.

In the embodiment of the present application, the adhesive force can be measured by a tensile tester.

In the embodiment of the present application, the first adhesive layer 112 is arranged on the current collector 11, and the current collector 11 is applied to the pole piece 1. When assembling the pole piece 1 and the separator 2, the first adhesive layer 112 can be used to The pole piece 1 and the diaphragm 2 are bonded to fix the diaphragm 2. In this way, even if the temperature of the battery rises, when the separator 2 is heated, both sides of the separator 2 are fixed, and the separator 2 will not shrink, so that the separator 2 can separate the cathode pole piece and the anode pole piece, and avoid the cathode pole piece and the anode pole piece. Direct contact causes the battery to short circuit. At the same time, the adhesive force of the first adhesive layer 112 is greater than or equal to 1 N/m and less than or equal to 40 N/m, ensuring the adhesive force of the first adhesive layer 112 , that is, ensuring that the first adhesive layer 112 and the separator 2 to prevent the first adhesive layer 112 from shrinking too much when heated, causing the diaphragm 2 to detach from the first adhesive layer 112 and failing to fix the diaphragm 2 .

According to some embodiments of the present application, the adhesive force of the first adhesive layer 112 is greater than or equal to 5 N/m and less than or equal to 40 N/m.

For example, the adhesive force of the first adhesive layer 112 is 5 N/m, or the adhesive force of the first adhesive layer 112 is 10 N/m, or the adhesive force of the first adhesive layer 112 is 20 N/m. , or the adhesive force of the first adhesive layer 112 is 30 N/m, or the adhesive force of the first adhesive layer 112 is 40 N/m.

In other implementations, the adhesive force of the first adhesive layer 112 can be other values, which is not limited by this application.

The adhesive force of the first adhesive layer 112 is further limited to ensure the adhesion between the first adhesive layer 112 and the separator 2 and achieve effective fixation of the separator 2 .

According to some embodiments of the present application, in the arrangement direction A of the glue coating area 1113 and the active material area 1111, the width L1 (L2) of the first adhesive layer 112 is less than or equal to 20 millimeters (mm).

The arrangement direction A of the glue coating area 1113 and the active material area 1111 is also the extending direction of one side of the current collector body 111 . In one implementation of the embodiment of the present application, the arrangement direction A of the glue coating area 1113 and the active material area 1111 is the width direction of the current collector body 111. In other implementations, the glue coating area 1113 and the active material area 1111 The arrangement direction A may be the length direction of the current collector body 111 .

In the embodiment of the present application, the width of the first adhesive layer 112 on the side of the current collector 11 where the tab area 1112 is located is L1, and the width of the first adhesive layer 112 on the side opposite to the tab area 1112 of the current collector 11 is L1. The width is L2. L1 and L2 may or may not be equal.

For example, L1 is 8mm and L2 is 10mm; or both L1 and L2 are 12mm.

Limiting the width L1 (L2) of the first adhesive layer 112 to less than or equal to 20 mm not only ensures that the first adhesive layer 112 on the current collector 11 can be used to fix the separator 2, but also prevents the width of the first adhesive layer 112 from being too wide. , causing the width of the glue coating area 1113 to be too wide, causing the width of the active material area 1111 to be too narrow, thus affecting the capacitance of the battery cell.

According to some embodiments of the present application, in the arrangement direction A of the glue coating area 1113 and the active material area 1111, the width L1 (L2) of the first adhesive layer 112 is greater than or equal to 7 mm and less than or equal to 11 mm.

For example, the width L1 (L2) of the first adhesive layer 112 is 7 mm, or the width L1 (L2) of the first adhesive layer 112 is 8 mm, or the width L1 (L2) of the first adhesive layer 112 is 9 mm. , or the width L1 (L2) of the first adhesive layer 112 is 10 mm, or the width L1 (L2) of the first adhesive layer 112 is 11 mm.

In other implementations, the width L1 (L2) of the first adhesive layer 112 can be other values, which is not limited by this application.

The width L1 (L2) of the first adhesive layer 112 is further limited to be greater than or equal to 7 mm and less than or equal to 11 mm, which not only ensures the fixation effect of the current collector 11 on the separator 2, but also avoids affecting the capacitance of the battery cells.

According to some embodiments of the present application, the material for preparing the first adhesive layer 112 includes adhesive glue, and the ratio of the mass of the adhesive glue to the total mass of the first adhesive layer 112 is greater than or equal to 10% and less than or equal to 50%. .

The adhesive glue ensures the adhesive force of the first adhesive layer 112 .

For example, the mass of the adhesive glue accounts for 10% of the total mass of the first adhesive layer 112; the mass of the adhesive glue accounts for 20% of the total mass of the first adhesive layer 112; the mass of the adhesive glue accounts for 10% of the total mass of the first adhesive layer 112; The mass of the adhesive layer 112 accounts for 30% of the total mass of the first adhesive layer 112 ; the mass of the adhesive glue accounts for 40% of the total mass of the first adhesive layer 112 ; and the mass of the adhesive glue accounts for 50% of the total mass of the first adhesive layer 112 .

In the embodiment of the present application, the mass proportion of the adhesive glue in the first adhesive layer 112 is increased to ensure the adhesion of the current collector 11 to the separator 2 so that the current collector 11 can effectively fix the separator 2 .

According to some embodiments of the present application, Figure 6 is a schematic cross-sectional view of a current collector provided by some embodiments of the present application. Referring to Figure 6 , the first adhesive layer 112 includes ceramic slurry and adhesive glue; or, Figure 7 is a schematic diagram of the present application. Some embodiments provide a schematic cross-sectional view of a current collector. Refer to FIG. 7 . The first adhesive layer 112 includes a stacked ceramic slurry layer 1121 and an adhesive layer 1122 . The ceramic slurry layer 1121 is located between the current collector body 111 and the adhesive layer 1122 . between the glue layers 1122.

When the battery is not connected to an external circuit, the battery capacity loss caused by internal spontaneous reactions is the battery's self-discharge. The battery's self-discharge will cause the battery capacity loss. During the production of the pole piece 1, a layer of ceramic slurry can be applied to the edge of the current collector 11 to reduce battery self-discharge.

When the first adhesive layer 112 includes ceramic slurry and adhesive glue, the ceramic slurry and the adhesive glue are first mixed and then applied on the glue coating area 1113 of the current collector body 111 . When the first adhesive layer 112 includes a stacked ceramic slurry layer 1121 and an adhesive glue layer 1122, a layer of ceramic slurry layer 1121 can be first applied to the glue coating area 1113 of the current collector body 111, and then An adhesive layer 1122 is coated on the ceramic slurry layer 1121 .

In the embodiment of the present application, when the first adhesive layer 112 includes ceramic slurry and adhesive glue, the adhesive glue is evenly distributed in the first adhesive layer 112 to ensure that the first adhesive layer 112 is in contact with the diaphragm 2 The adhesion enables the pole piece 1 to effectively fix the diaphragm 2. When the first adhesive layer 112 includes a stacked ceramic slurry layer 1121 and an adhesive glue layer 1122, the effect of bonding the separator 2 can be achieved without changing the original formula of the ceramic slurry layer 1121.

According to some embodiments of the present application, the adhesive glue includes polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene mixture, polyvinylidene fluoride-chlorotrifluoroethylene mixture, polytetrafluoroethylene, polymethylmethacrylate , at least one of polyacrylonitrile and polyethylene oxide.

The adhesive may include one, two, three or even more of the above materials, which is not limited in this application.

Exemplarily, the adhesive glue includes polyvinylidene fluoride, or the adhesive glue includes polyvinylidene fluoride and a polyvinylidene fluoride-hexafluoropropylene mixture, or the adhesive glue includes polyvinylidene fluoride, polytetrafluoroethylene, polymethylmethacrylate Methyl acrylate, polyacrylonitrile and polyethylene oxide.

Polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene mixtures, polyvinylidene fluoride-chlorotrifluoroethylene mixtures, polytetrafluoroethylene, polymethyl methacrylate, polyacrylonitrile and polyethylene oxide are all readily available The adhesive material is made of high-adhesion glue, which reduces the production cost and ensures the adhesion of the first adhesive layer 112 .

According to some embodiments of the present application, the present application provides a pole piece 1 . Figure 8 is a top view of a pole piece provided by some embodiments of the present application. Figure 9 is a schematic cross-sectional view of a pole piece provided by some embodiments of the present application. Referring to Figures 8 and 9 , the pole piece 1 includes a current collector 11 and an active material layer 12 and the tab 13, and the current collector 11 is any current collector 11 in the above embodiments. In the arrangement direction of the active material area 1111 , the glue coating area 1113 and the tab area 1112 , the first adhesive layer 112 of the current collector 11 is located between the active material layer 12 and the tab 13 , and between the active material layer 12 and the tab area 1112 . On the opposite side of the tab 13; the active material layer 12 is arranged in the active material area 1111 of the current collector 11; and the tab 13 is arranged in the tab area of the current collector 11.

The active material layer 12 is located in the active material area 1111. The active material is a part of the battery constituting materials and directly affects the performance of the battery. The active material layer 12 of the anode plate is composed of adhesive, conductive agent, anode material, etc.; the active material layer 12 of the cathode plate is composed of adhesive, graphite carbon powder, etc. The liquid active material is coated on the current collector 11 , and after drying and solidifying, the active material becomes a solid active material, thereby bonding to the current collector 11 to form the active material layer 12 .

The tab 13 is a metal conductor that leads out the cathode and anode from the battery cell. In some embodiments, the anode of the battery is made of aluminum material, the cathode is made of nickel material, and the cathode is also made of copper-nickel-plated material. They are made of film and The metal strip is composed of two parts.

Figure 10 is a schematic diagram of the pole piece manufacturing process provided by some embodiments of the present application. As shown in FIG. 4 and FIG. 10 , when making the pole piece 1 , both sides of the current collector 11 have tab areas 1112 . After the active material layer 12 and the first adhesive layer 112 are formed on the current collector body 111 , It will be cut to form pole pieces.

In the embodiment of the present application, cutting is performed along the cutting line B in FIG. 10 , thus forming a pole piece, so as to obtain multiple continuous pole pieces of a battery cell. Since both opposite ends of the pole piece have the first adhesive layer 112, and the first adhesive layer 112 is cut during cutting, it will not affect the active material layer 12 and reduce the occurrence of burrs or burrs on the pole piece 1. bump phenomenon and improve production yield. At the same time, the adhesive glue in the first adhesive layer 112 can ensure that the pole piece 1 can be effectively bonded to the diaphragm 2 .

The pole piece 1 provided by the embodiment of the present application can effectively fix the separator 2, avoid battery short circuit caused by the shrinkage of the separator 2, reduce the occurrence of burrs or bumps on the pole piece 1, and improve the production yield.

Referring to Figures 11 and 12, Figure 11 is a top view of a separator provided by some embodiments of the present application, and Figure 12 is a cross-sectional view of a separator provided by some embodiments of the present application. The separator 2 includes a base material 21 and a second adhesive layer 22 . The base material 21 has two first regions 211 and one second region 212. In the width direction C of the base material 21, the second region 212 is located between the two first regions 211; the second adhesive layer 22 is provided on The adhesive force of the second adhesive layer 22 on the two first areas 211 of the base material 21 on two opposite surfaces along the thickness direction of each first area 211 is greater than or equal to 1 N/m and less than or equal to 40 N/m.

The separator 2 refers to a layer of isolation material between the anode plate and the cathode plate. It is a very critical part of the battery and has a direct impact on the safety and cost of the battery. Its main function is to isolate the anode and cathode and make the electrons in the battery It cannot pass freely, allowing ions in the electrolyte to pass freely between the cathode and anode.

The base material 21 is used to support the second adhesive layer 22. In the embodiment of the present application, the base material 21 can be a single-layer polyethylene, a single-layer polypropylene, a double-layer polyethylene, a double-layer polypropylene, or a multi-layer polyethylene. Multiple layers of polypropylene or laminates of polyethylene and polypropylene.

In other implementations, the base material 21 can be made of other materials, which is not limited by this application.

In the embodiment of the present application, the second adhesive layer 22 includes adhesive glue, thereby ensuring the adhesive force of the second adhesive layer 22 .

Arrange adhesive glue on the diaphragm 2. After the pole piece 1 is produced, the pole piece 1 is laminated or curled. The second adhesive layer 22 on the diaphragm 2 will be laminated, and both surfaces of the base material 21 have the second adhesive layer. layer 22, the separators 2 stacked together can be bonded together through their own second adhesive layer 22, thereby fixing the separator 2 and preventing the battery from short-circuiting due to shrinkage of the separator 2. The adhesive force of the second adhesive layer 22 is greater than or equal to 1 N/m and less than or equal to 40 N/m, which ensures the adhesive force of the second adhesive layer 22 and prevents the separator 2 from coming off.

According to some embodiments of the present application, the adhesive force of the second adhesive layer 22 is greater than or equal to 5 N/m and less than or equal to 40 N/m.

For example, the adhesive force of the second adhesive layer 22 is 5 N/m, or the adhesive force of the second adhesive layer 22 is 10 N/m, or the adhesive force of the second adhesive layer 22 is 20 N/m. , or the adhesive force of the second adhesive layer 22 is 30N/m, or the adhesive force of the second adhesive layer 22 is 40N/m.

In other implementations, the adhesive force of the second adhesive layer 22 can be other values, which is not limited by this application.

The adhesive force of the second adhesive layer 22 is further limited to ensure the adhesion between the second adhesive layers 22 and achieve effective fixation of the separator 2 .

According to some embodiments of the present application, in the width direction C of the base material 21, the width L3 (L4) of the second adhesive layer 22 is less than or equal to 20 mm.

Limiting the width L3 (L4) of the second adhesive layer 22 to less than or equal to 20 mm not only ensures that the second adhesive layer 22 on the base material 21 can be used to fix the diaphragm 2, but also prevents the width of the second adhesive layer 22 from being too wide. , affecting the size of diaphragm 2.

In the embodiment of the present application, the widths of the second adhesive layer 22 on both sides of the base material 21 are L3 and L4 respectively. L3 and L4 may or may not be equal.

For example, L3 is 5mm and L4 is 8mm; or both L3 and L4 are 9mm.

According to some embodiments of the present application, in the width direction C of the base material 21, the width L3 (L4) of the second adhesive layer 22 is greater than or equal to 7 mm and less than or equal to 11 mm.

For example, the width L3 (L4) of the second adhesive layer 22 is 7 mm, or the width L3 (L4) of the second adhesive layer 22 is 8 mm, or the width L3 (L4) of the second adhesive layer 22 is 9 mm. , or the width L3 (L4) of the second adhesive layer 22 is 10 mm, or the width L3 (L4) of the second adhesive layer 22 is 11 mm.

In other implementations, the width L3 (L4) of the second adhesive layer 22 can be other values, which is not limited by this application.

The width L3 (L4) of the second adhesive layer 22 is further limited to be greater than or equal to 7 mm and less than or equal to 11 mm, which not only ensures the fixing effect on the diaphragm 2, but also prevents the second adhesive layer 22 from being too wide, making the diaphragm 2 occupy less space. The ratio is too large, thus affecting the energy density of the battery.

According to some embodiments of the present application, referring to Figure 12, the separator 2 further includes a first insulating layer 23. The first insulating layer 23 is disposed on two opposite surfaces of the second region 212 of the base material 21 along the thickness direction. The first insulating layer 23 23Including adhesive glue and ceramic slurry.

The first insulating layer 23 is used to ensure the insulation of the separator 2 and prevent the cathode plate and the anode plate from being in direct contact and causing a short circuit in the battery. Ceramic slurry is a commonly used insulating material with good insulation properties. The adhesive glue and ceramic slurry are mixed to ensure that the ceramic slurry can be bonded to the base material 21 .

According to some embodiments of the present application, the second adhesive layer 22 and the first insulating layer 23 are formed in the same layer.

The second adhesive layer 22 and the first insulating layer 23 are both made on the base material 21 through a microgravure roller. The area corresponding to the rolling surface of the microgravure roller has the slurry to be coated. The microgravure roller is on the base material. 21. Apply the slurry to the corresponding area after rolling. In the embodiment of the present application, adhesive glue can be placed in the area corresponding to the first area 211 on the rolling surface of the microgravure roller, and adhesive glue and The mixture of ceramic slurry is then rolled on the substrate 21 by a microgravure roller to form the second adhesive layer 22 and the first insulating layer 23 respectively.

The second adhesive layer 22 and the first insulating layer 23 are made in the same layer, which can reduce the number of manufacturing steps and improve work efficiency.

According to other embodiments of the present application, FIG. 13 is a cross-sectional view of a separator provided by some embodiments of the present application. Referring to FIG. 13 , the separator 2 further includes a second insulating layer 24 , and the second insulating layer 24 is disposed on the base material 21 along the thickness. The two opposite surfaces in the direction completely cover the two surfaces of the base material 21. In the thickness direction of the base material 21, the second insulating layer 24 is located between the second adhesive layer 22 and the base material 21. The second insulating layer 24 Includes adhesives and ceramic slurries.

The second adhesive layer 22 and the second insulating layer 24 can be made in layers. For example, a layer of the second insulating layer 24 is first made on the base material 21 , and then a layer of the second insulating layer 24 is made on the first area 211 of the base material 21 . Two adhesive layers 22.

The second insulating layer 24 is used to ensure the insulation of the separator 2 and prevent the cathode plate and the anode plate from being in direct contact and causing a short circuit in the battery. Ceramic slurry is a commonly used insulating material with good insulation properties. The adhesive glue and ceramic slurry are mixed to ensure that the ceramic slurry can be bonded to the base material 21 .

The embodiment of the present application provides a battery cell, which includes the pole piece in the above embodiment and/or the separator in the above embodiment.

In some embodiments, one of the cathode electrode piece and the anode electrode piece of the battery cell adopts the electrode piece in the above embodiment. In other embodiments, both the cathode pole piece and the anode pole piece of the battery cell can adopt the pole pieces in the above embodiments.

In the pole piece 1 provided by the embodiment of the present application, the separator 2 can be effectively fixed. After the separator 2 is heated, the separator 2 will not shrink, so that the separator 2 can separate the cathode pole piece and the anode pole piece, avoiding the cathode pole piece and the anode. Direct contact between the pole pieces causes a short circuit in the battery.

According to some embodiments of the present application, Figure 14 is a cross-sectional view of a pole piece provided by some embodiments of the present application. Referring to Figure 14, when the battery cell includes the above-mentioned pole piece 1, the first adhesive layer of the pole piece 1 112 is fixed with diaphragm 2.

In the battery cell, the pole piece 1 and the separator 2 can be bonded through the first adhesive layer 112 to fix them together to fix the separator 2 . In this way, even if the temperature of the battery rises, when the separator 2 is heated, both sides of the separator 2 are fixed, and the separator 2 will not shrink, so that the separator 2 can separate the cathode pole piece and the anode pole piece, and avoid the cathode pole piece and the anode pole piece. Direct contact causes the battery to short circuit.

According to some embodiments of the present application, Figure 15 is a cross-sectional view of a pole piece provided by some embodiments of the present application. Referring to Figure 15, the cathode pole piece 14 and the anode pole piece 15 of the battery cell both adopt the pole pieces in the above embodiments. , the separator 2 is located between the cathode pole piece 14 and the anode pole piece 15, and the first adhesive layer 112 of the cathode pole piece 14 and the first adhesive layer 112 of the anode pole piece 15 are both fixed to the separator 2.

The first adhesive layer 112 of the cathode plate 14 and the first adhesive layer 112 of the anode plate 15 are both bonded to the separator 2 to increase the fixing effect on the separator 2 .

According to some embodiments of the present application, see Figure 16. Figure 16 is a cross-sectional view of the cooperation between the pole piece and the separator provided in some embodiments of the present application. When the battery cell includes the separator 2 in the above embodiment, it is located on the same pole piece 1 The second adhesive layers 22 of the two diaphragms 2 on both sides are fixed together.

When the pole pieces 1 are stacked or rolled, the second adhesive layer 22 on the separator 2 will be stacked, so that the stacked separators 2 can be bonded together through the second adhesive layer 22 to fix the separator 2. Avoid battery short circuit due to shrinkage of separator 2.

According to some embodiments of the present application, the second adhesive layer 22 fixed together is located on both sides of the active material layer 12 of the pole piece 1 in the width direction of the current collector 11 .

The second adhesive layer 22 is located on both sides of the active material layer 12 of the pole piece 1 to prevent the second adhesive layer 22 from affecting the active material layer 12 and thereby affecting the performance of the battery.

The embodiments of the present application provide a hot-pressing mold 3 for producing battery cells. Figure 17 is a structural diagram of the hot-pressing mold provided by some embodiments of the present application. Figure 18 is a hot-pressing mold provided by some embodiments of the present application. Structural diagram from another perspective, Figure 19 is a front view of the hot pressing mold provided by some embodiments of the present application, and Figure 20 is a cross-sectional view of the C-C plane in Figure 19. 17 to 20 , the hot pressing mold 3 includes a first clamping plate 31 and at least two first bumps 32 . The at least two first bumps 32 are located on the same first surface of the first clamping plate 31 , and in the width direction of the first clamping plate 31 , a part of the at least two first bumps 32 is close to a certain part of the first surface. One side is provided, and the other part is provided close to the other side of the first surface, where one side and the other side are opposite sides of the first surface, so that at least two first protrusions are formed when making the battery cell. The position of the block 32 corresponds to the position of the first adhesive layer 112 .

The first clamping plate 31 and the first bump 32 may be integrally formed, or the first bump 32 may be bonded to the first surface of the first clamping plate 31 . In the embodiment of the present application, the hot-pressing mold 3 includes two first bumps 32 , and the two first bumps 32 are located on opposite sides of the first surface, so that the structure of the hot-pressing mold 3 is simpler. In other implementations, the hot pressing mold 3 may include a plurality of first bumps 32 , and the first bumps 32 located on the same side of the first surface are arranged along the length direction of the first clamping plate 31 .

In an implementation manner of the embodiment of the present application, when manufacturing a battery cell, the positions of at least two first bumps 32 correspond to the positions of the first adhesive layer 112 , and the at least two first bumps 32 are To bond the first adhesive layer 112 and the diaphragm 2 together. Pressure can be applied to the diaphragm 2 and the pole piece 1 through the first bump 32 on the first clamping plate 31. Under the action of heat, the first adhesive layer 112 and the second adhesive layer 22 on the diaphragm 2 are thermally combined and bonded. together to prevent diaphragm 2 from shrinking at high temperatures.

With reference to Figures 17 to 20, the hot pressing mold 3 also includes a second clamping plate 33 and at least two second protrusions 34. The second clamping plate 33 is opposite to the first clamping plate 31; the at least two second protrusions 34 are located on the second plying plate 33. The same second surface of the clamping plate 33 has a one-to-one correspondence with the positions of the at least two second bumps 34 and the positions of the at least two first bumps 32 .

The second clamping plate 33 and the second protrusion 34 can be integrally formed, or the second protrusion 34 can be bonded to the second surface of the second plying plate 33 . In the embodiment of the present application, the hot-pressing mold 3 includes two second bumps 34 , and the two second bumps 34 are located on opposite sides of the second surface, so that the structure of the hot-pressing mold 3 is simpler. In other implementations, the hot pressing mold 3 may include a plurality of second bumps 34 , and the second bumps 34 located on the same side of the second surface are arranged along the length direction of the second clamping plate 33 .

In one implementation of the embodiment of the present application, when manufacturing a battery cell, the first bump 32 and the second bump 34 on the hot pressing mold 3 simultaneously exert pressure on the separator 2 and the pole piece 1. Under the action of heat, The first adhesive layer 112 and the second adhesive layer 22 on the diaphragm 2 are thermally combined and bonded together to prevent the diaphragm 2 from shrinking at high temperatures.

In an implementation manner of the embodiment of the present application, when making a battery cell, the positions of at least two first bumps 32 correspond to the positions of the second adhesive layer 22 , and the at least two first bumps 32 are The second adhesive layer 22 of the diaphragm 2 is bonded together to prevent the diaphragm 2 from shrinking at high temperature.

Embodiments of the present application provide a battery, including at least two battery cells in any embodiment.

Batteries can be used in, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

By using the battery cells in the embodiments of the present disclosure, it can be ensured that the battery 100 is not prone to short circuit and has high safety.

Embodiments of the present application provide an electrical device. The electrical device includes a battery in any embodiment, and the battery is used to provide electrical energy.

Electric devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

By using the battery in the embodiment of the present disclosure, it can be ensured that the battery is not easily short-circuited, thereby making the safety of the electrical device high.

According to some embodiments of the present application, the present application provides a pole piece 1. The pole piece 1 includes a current collector 11, a first adhesive layer 112, an active material layer 12 and a pole tab 13. The current collector 11 includes a current collector body 111. The current collector body 111 has an active material area 1111, a tab area 1112 and a glue coating area 1113. The tab area 1112 is located on one side of the active material area 1111, and the glue application area 1113 is located in the active material area. 1111 and the tab area 1112 and the other side of the active material area 1111 opposite to the tab area 1112; the first adhesive layer 112 is provided in the glue coating area 1113, and the adhesive force of the first adhesive layer 112 is greater than or Equal to 5N/m and less than or equal to 40N/m. In the arrangement direction of the glue coating area 1113 and the active material area 1111, the width of the first adhesive layer 112 is greater than or equal to 7 mm and less than or equal to 11 mm. The first adhesive layer 112 includes adhesive glue, and the ratio of the mass of the adhesive glue to the total mass of the first adhesive layer 112 is greater than or equal to 10% and less than or equal to 50%. The first adhesive layer 112 includes a stacked ceramic slurry layer 1121 and an adhesive layer 1122 . The ceramic slurry layer 1121 is located between the current collector body 111 and the adhesive layer 1122 . The active material layer 12 is disposed in the active material region 1111 of the current collector. The tab 13 is disposed in the tab area 1112 of the current collector. The first adhesive layer 112 of the pole piece 1 and the diaphragm 2 are fixed together.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. The scope shall be covered by the claims and description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A diaphragm, the diaphragm (2) includes:

The base material (21) has two first areas (211) and one second area (212). In the width direction of the base material (21), the second area (212) is located between the two first areas (211) and a second area (212). between the first area (211);

The second adhesive layer (22) is disposed on two surfaces of each of the two first regions (211) of the base material (21) opposite in the thickness direction, so The adhesive force of the second adhesive layer (22) is greater than or equal to 1N/m and less than or equal to 40N/m.
The separator according to claim 1, wherein the adhesive force of the second adhesive layer (22) is greater than or equal to 5 N/m and less than or equal to 40 N/m.
The separator according to claim 1 or 2, wherein the width of the second adhesive layer (22) in the width direction of the base material (21) is less than or equal to 20 mm.
The separator according to any one of claims 1 to 3, wherein the width of the second adhesive layer (22) in the width direction of the base material (21) is greater than or equal to 7 mm and less than or equal to 11mm.
The membrane according to any one of claims 1 to 4, wherein the membrane (2) further comprises:

A first insulating layer (23) is provided on two opposite surfaces of the second region (212) of the base material (21) in the thickness direction. The first insulating layer (23) includes adhesive and ceramics. slurry.
The membrane according to any one of claims 1 to 5, wherein the membrane (2) further comprises:

The second insulating layer (24) is disposed on two opposite surfaces of the base material (21) in the thickness direction and completely covers the two surfaces of the base material (21). In the thickness direction, the second insulation layer (24) is located between the second adhesive layer (22) and the base material (21). The second insulation layer (24) includes adhesive glue and Ceramic slurry.
A battery cell, the battery cell includes a pole piece (1) and a separator (2) as claimed in any one of claims 1 to 6, two of which are located on both sides of the same pole piece (1). The second adhesive layer (22) of the membrane (2) is held together.
The battery cell according to claim 7, wherein the second adhesive layer (22) fixed together is located on the pole piece in the width direction of the base material (21) of the separator (2). (1) Both sides of the active material layer.
A hot-pressing mold, the hot-pressing mold (3) is used to produce the battery cell as claimed in claim 7 or 8, and the hot-pressing mold (3) includes:

The first splint (31);

At least two first bumps (32), the at least two first bumps (32) are located on the same first surface of the first plywood (31), and on the first plywood (31) In the width direction, a part of the at least two first bumps (32) is disposed close to a certain side of the first surface, and the other part is disposed close to the other side of the first surface, wherein the The certain side and the other side are opposite sides of the first surface, so that the positions of the at least two first bumps (32) are consistent with the position of the first surface when making the battery cell. The position of the second adhesive layer (22) corresponds to that of the second adhesive layer (22).
The hot pressing mold according to claim 9, wherein the hot pressing mold (3) further includes:

The second plywood (33) is opposite to the first plywood (31);

At least two second bumps (34), the at least two second bumps (34) are located on the same second surface of the second clamping plate (33), and the first surface and the second The surfaces are opposite, and the positions of the at least two second bumps (34) correspond to the positions of the at least two first bumps (32).
A battery comprising at least two battery cells according to claim 7 or 8.
An electrical device, the electrical device comprising the battery as claimed in claim 11, the battery being used to provide electrical energy.