CN216849989U

CN216849989U - Laminated cell, single battery, battery and power utilization device

Info

Publication number: CN216849989U
Application number: CN202122743943.1U
Authority: CN
Inventors: 常雯
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-06-28
Anticipated expiration: 2031-11-10

Abstract

The application provides a lamination formula electricity core, battery monomer, battery and power consumption device relates to battery technical field. Wherein, this lamination formula electricity core includes: the diaphragm is positioned between the first pole piece and the second pole piece; the first coating layer on the surface of the first current collector of the first pole piece comprises a first active area and a first insulating area which are continuously and alternately arranged along the length direction of the first active area; the second coating layer on the surface of the second current collector of the second pole piece comprises a second active area and a second insulating area which are continuously and alternately arranged along the length direction of the second active area; wherein the first pole piece, the diaphragm, and the second pole piece are stacked and repeatedly folded to form a continuous stack, and the first active region and the second active region are respectively located at non-folded portions of the continuous stack and correspond to each other. The technical scheme of the application can effectively relieve the problem of potential safety hazard of lithium analysis in the laminated lithium ion battery formed by slicing.

Description

Laminated cell, single battery, battery and power utilization device

Technical Field

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

Background

At present, a battery used for a vehicle is generally a lithium ion battery, and the lithium ion battery as a rechargeable battery has the advantages of small volume, high energy density, high power density, multiple recycling times, long storage time and the like.

The pole piece of the laminated lithium ion battery is formed by slicing, and the pole piece dislocation phenomenon easily occurs in the assembling and transferring processes, so that the lithium analysis risk is caused, and an important potential safety hazard of the battery is caused. Therefore, how to avoid the pole piece dislocation phenomenon of the laminated lithium ion battery becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

In view of above-mentioned problem, the application provides a lamination formula electricity core, battery monomer, battery and power consumption device, can alleviate the problem of the potential safety hazard of the lithium of separating that the lamination formula lithium ion battery that the section formed exists.

In a first aspect, the present application provides a laminated electrical core, including: the diaphragm is positioned between the first pole piece and the second pole piece; the first coating layer on the surface of the first current collector of the first pole piece comprises a first active area and a first insulating area which are continuously and alternately arranged along the length direction of the first coating layer; the second coating layer on the surface of the second current collector of the second pole piece comprises a second active area and a second insulating area which are continuously and alternately arranged along the length direction of the second active area; the first pole piece, the diaphragm and the second pole piece are overlapped and repeatedly folded to form a continuous lamination, and the first active area and the second active area of the continuous lamination correspond to the non-folding portions respectively.

In the technical scheme of the embodiment of the application, the continuous lamination formed by overlapping and repeatedly folding the first pole piece, the diaphragm and the second pole piece is adopted, and a plurality of groups of opposite folding parts formed by repeated folding can realize mutual limiting, avoid the dislocation phenomenon of the pole pieces and reduce the lithium precipitation risk; the first coating layer of the first pole piece is arranged to comprise a first active area and a first insulating area which are continuously and alternately arranged, the second coating layer of the second pole piece is arranged to comprise a second active area and a second insulating area which are continuously and alternately arranged, when the continuous lamination is formed by folding, the first active area and the second active area respectively correspond to each other and are respectively positioned at the non-folding part of the continuous lamination, the first insulating area and the second insulating area correspond to the folding part, the problem of falling-off caused by the fact that the active substances are positioned at the folding part can be avoided, the possibility of fracture of the folding part of the current collector can be reduced by arranging the insulating areas, the risk of fracture of the bending part and piercing of the diaphragm is reduced, and the risk of direct lapping ignition of the negative active substances and the positive current collector when the diaphragm contracts can be avoided, the safety can be improved.

In some embodiments, the first and second insulating regions correspond to folded portions of the continuous laminate, and the folded portions are folded about a centerline of the first and second insulating regions, the centerline being perpendicular to a length direction of the first and second current collectors. By setting the folding position as the central line of the first insulation region and the second insulation region, the first active region and the second active region respectively correspond to each other and are located at the non-folding part of the continuous lamination after repeated folding, so that the use reliability and safety of the laminated battery cell are ensured.

In some embodiments, the first insulating region and the second insulating region are partially located in the non-folded portion of the continuous laminate. Except for the folding part, the first insulating area and the second insulating area are still partially located on the non-folding straight part of the continuous lamination, so that the risk of belt breakage between the two areas can be reduced, and the risk of fire caused by direct lap joint of the negative active material and the positive current collector after the diaphragm shrinks can be avoided.

In some embodiments, the number of the first pole pieces is one, and one side surface of the first current collector is provided with a first coating layer; the number of the second pole pieces is one, and one side surface of the second current collector is provided with a second coating layer. The continuous pole piece can be formed with only one first pole piece and one second pole piece with the separator in between, where the first pole piece and the second pole piece are each coated on one side.

In some embodiments, the number of the first pole pieces is at least one, and the two side surfaces of the first current collector are respectively provided with a first coating layer; the number of the second pole pieces is more than one of the first pole pieces, one side surface of the second current collector of two of the second pole pieces is provided with a second coating layer, and the two side surfaces of the second current collectors of the rest second pole pieces are respectively provided with a second coating layer. A multi-layer laminated cell can be constructed using a double-coated first pole piece and two single-coated second pole pieces, the double-coated second pole piece.

In some embodiments, each of the first active regions has the same length in a length direction of the first current collector, and each of the first insulating regions has the same length. The length of each first active region of the first coating layer is the same, and the length of each first insulating region is the same, so that convenience and reliability of the corresponding relationship between the first active region and the second active region after folding can be guaranteed.

In some embodiments, each of the second active regions has the same length in a length direction of the second current collector, and the plurality of second insulation regions includes inner insulation regions and outer insulation regions having a length greater than that of the inner insulation regions, which are alternately arranged; in the continuous laminate, the inner insulation region is located inside the corresponding first insulation region, and the outer insulation region is located outside the corresponding first insulation region. In such a design, the second pole piece is folded on the basis of the first pole piece to form a continuous lamination, and then the continuous lamination has a part positioned on the inner side and a part positioned on the outer side of the first pole piece, and the two parts are arranged in different lengths, so that the corresponding relation between the folded first active region and the folded second active region can be ensured.

In some embodiments, the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, and the second active area interference corresponds to the first active area. By enabling the negative electrode active material in the second active region to be in interference fit with and face the positive electrode active material corresponding to the first active region, the lithium ions electrolyzed by the positive electrode plate can all reach the coating region of the negative electrode active material of the negative electrode plate facing the positive electrode plate in the electrolysis process, all participate in the electrolysis reaction, and the problems that burrs are generated due to precipitation of the lithium ions, the battery is short-circuited and the like are avoided.

In some embodiments, the first coating layer includes a first active material layer and a first insulating layer alternately arranged in series, and corresponding regions of the first active material layer and the first insulating layer are a first active region and a first insulating region, respectively; the second coating layer comprises a second active material layer and a second insulating layer which are continuously and alternately arranged, and the regions corresponding to the second active material layer and the second insulating layer are a second active region and a second insulating region respectively. The alternating active regions and insulating regions may be formed by alternating layers of active material and insulating layers.

In some embodiments, the first active material layer and the first insulating layer have a first overlap region, and the second active material layer and the second insulating layer have a second overlap region; the length of the first and second overlapping regions is no greater than 0.5mm in the length direction of the first and second current collectors. When the active substance and the insulating material are coated alternately, the active substance and the insulating material are overlapped to ensure that the active region and the adjacent insulating region can be jointed without gaps, thereby reducing the difficulty of the manufacturing process.

In some embodiments, the thickness of the first insulating layer is not greater than the thickness of the first active material layer; the thickness of the second insulating layer is not greater than the thickness of the second active material layer. The flatness of the battery cell can be improved through the design.

In some embodiments, the first coating layer includes a first active material layer coated continuously, and first insulating layers formed on the first active material layer at intervals, where a region corresponding to the first insulating layer in the first coating layer is a first insulating region, and the remaining regions are first active regions; the second coating layer comprises a second active material layer coated continuously and a second insulating layer formed on the second active material layer at intervals, wherein the area corresponding to the second insulating layer in the second coating layer is a second insulating area, and the rest area is a second active area. It is also possible to form alternating active regions and insulating regions by successively coating an active material layer and providing insulating layers on the active material layer at intervals.

In some embodiments, the first pole piece, the diaphragm, and the second pole piece are folded back and forth in a Z-shape after being stacked. Can form continuous lamination according to the mode that the Z type was repeatedly folded to through forming a plurality of multiunit folding parts in opposite directions, realize spacing each other, avoid the dislocation of pole piece.

In a second aspect, the present application provides a battery cell including the laminated battery cell of any one of the above aspects.

In a third aspect, the present application provides a battery including the battery cell of any of the above aspects.

In a fourth aspect, the present application provides an electric device comprising the battery of any of the above aspects.

In the technical scheme of the embodiment of the application, the multiple groups of opposite folding parts formed by repeated folding of continuous laminations can realize mutual limiting, avoid the dislocation phenomenon of pole pieces, reduce the risk of lithium precipitation, reduce the cutting times of the pole pieces of the laminated battery cell and reduce the probability that burrs at the cutting position penetrate through a diaphragm too much; through adopting the mode of interval coating active material, when folding and form continuous lamination, make first active area and second active area correspond respectively, and all be located the non-folding part of continuous lamination, make first insulating area and second insulating area correspond to the folding part, can avoid the problem that active material is located the problem that drops that the folding part caused, and the setting of insulating area can reduce the possibility that the folding part of mass flow body takes place fracture, thereby reduce the risk that the diaphragm was impaled in the fracture of bending part, and can avoid the risk that negative pole active material and the direct overlap joint of anodal mass flow body were caught fire when the diaphragm shrink, can improve battery safety.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

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

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

FIG. 2 is a schematic diagram of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure;

fig. 4 is a schematic cross-sectional structure view of a laminated cell according to some embodiments of the present application;

fig. 5 is a partially enlarged structural diagram of a laminated cell according to some embodiments of the present application.

The reference numbers in the detailed description are as follows:

An electric device 1000;

a battery 100;

a battery cell 10;

the laminated battery cell comprises a laminated battery cell 1, a top cover assembly 2 and a shell 3;

the first electrode sheet 11, the first current collector 111, the first coating layer 112, the first active region 1121, the first insulating region 1122;

a second electrode tab 12, a second current collector 121, a second coating layer 122, a second active region 1221, a second insulating region 1222, an inner insulating region 1222a, an outer insulating region 1222 b;

a diaphragm 13.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: there are three cases of A, A and B, and B. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

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

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of power batteries is more and more extensive from the development of market conditions. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles and electric automobiles, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanded.

The inventor notices that the pole piece of the current laminated battery cell 1 is formed by slicing, namely, according to the size of the manufactured battery 100, the positive pole piece and the negative pole piece are punched into a plurality of small pieces, and the small pieces are repeatedly superposed, the phenomenon of pole piece dislocation easily occurs in the process of assembling and transferring the laminated structure formed by the method, so that the lithium precipitation risk is caused, each punched small piece of the pole piece has four trimming edges, burrs are easily generated, the diaphragm 13 can be pierced, and the short circuit of the battery 100 is caused.

In order to alleviate the pole piece dislocation that laminated electric core 1 appears easily and the problem of battery 100 short circuit that the side cut burr caused, the applicant researches the discovery, can adopt continuous pole piece folding formation laminated battery 100 repeatedly, need not die-cut into a plurality of small pieces, die-cut side cut has been reduced, thereby can reduce the probability of the short circuit that the side cut burr caused, improve battery 100's security performance, and also need not a slice stack during the lamination, only need fold repeatedly can, lamination efficiency can promote by a wide margin, it can realize spacing each other to fold mutually through the multiunit that folds repeatedly and form in opposite directions, avoid the pole piece dislocation phenomenon to appear, can effectively reduce and analyse the lithium risk.

The applicant further studies and finds that when continuous lamination is formed by folding, at the folding corners of continuous pole pieces, due to repeated folding, the cathode pole piece is wrapped by the anode pole piece at a part of folding positions, namely, the anode pole piece at the folding position is in interference fit with the corresponding cathode pole piece, so that part of lithium ions electrolyzed by the anode pole piece cannot completely reach the coating area of the cathode active material of the cathode pole piece right opposite to the anode pole piece, the lithium precipitation condition occurs, the active material at the folding positions is easy to fall off due to folding, the pole piece is also easy to break due to folding, if the anode pole piece breaks at the folding corners, burrs at the folding corners are easy to pierce through the diaphragm 13, and the cathode pole piece breaks at the folding corners, so that no corresponding area at the folding corners of the anode pole piece is caused, and the lithium precipitation condition is still caused.

Based on the above consideration, the inventor has conducted intensive research and designed a continuous laminated battery core 1, in which active materials and insulating materials are coated on the surface of a current collector at intervals, and when the battery core is folded, a folding position corresponds to an area where the insulating materials are disposed, so that the area coated with the active materials corresponds to an unfolded straight area, and therefore problems such as lithium precipitation, folding position fracture, and active material falling can be effectively avoided.

The power consumption device disclosed in the embodiment of the present application may be, but is not limited to, a power consumption device for a vehicle, a ship, an aircraft, or the like, and the battery 100 disclosed in the present application may be used to constitute a power supply system of the power consumption device.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure. The battery cell 10 refers to the smallest unit constituting the battery 100, in the battery 100, the battery cell 10 may be a plurality of battery cells 10, and a plurality of battery cells 10 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection of the plurality of battery cells 10. The battery 100 formed by the battery cells 10 can be used as a power supply system of an electric device, the battery cells 10 can be used in the electric devices such as vehicles, ships or aircrafts, but not limited to electric vehicles, ships, spacecrafts, etc. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present disclosure, and as shown in the drawings, the battery cell 10 includes a top cover assembly 2, a housing 3, a battery cell assembly, and other functional components.

The housing 3 is a component for cooperating with the cap component 2 to form an internal environment of the battery cell 10, the formed internal environment can be used for accommodating a battery cell, an electrolyte and other components, the housing 3 can be in various shapes and dimensions, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like, specifically, the shape of the housing 3 can be determined according to the specific shape and dimensions of the battery cell component, the material of the housing 3 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like, and the embodiment of the present invention is not particularly limited thereto; the top cover assembly 2 covers the opening of the shell 3 to isolate the internal environment of the battery monomer 10 from the external environment, and the top cover assembly 2 mainly comprises a top cover plate, a positive pole column assembly, a negative pole column assembly, an explosion-proof sheet and the like; without limitation, the cover assembly 2 and the housing 3 may be integrated, and specifically, the cover assembly 2 and the housing 3 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to seal the inside of the housing 3, the cover assembly 2 covers the housing 3.

The battery cell is a component for generating electrochemical reaction in the battery cell 10, and the embodiment of the application discloses a laminated battery cell 1, which is formed by stacking a positive plate and a negative plate, wherein a diaphragm 13 is arranged between the positive plate and the negative plate, the portions of the positive plate and the negative plate having active substances form a main body portion of the battery cell, and the portions of the positive plate and the negative plate not having active substances form tabs respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. In the charging and discharging process of the battery, the anode active material and the cathode active material react with the electrolyte, and the pole lugs are connected with the pole posts of the top cover assembly 2 to form a current loop.

According to some embodiments of the present application, referring to fig. 4, as shown therein, the present application provides a laminated cell 1, the laminated cell 1 comprising a first pole piece 11, a second pole piece 12 and a separator 13 therebetween; the first coating layer 112 on the surface of the first current collector 111 of the first pole piece 11 includes a first active region 1121 and a first insulation region 1122 which are continuously and alternately arranged along the length direction thereof; the second coating layer 122 on the surface of the second current collector 121 of the second pole piece 12 comprises second active regions 1221 and second insulating regions 1222 which are continuously and alternately arranged along the length direction of the second active regions; the first pole piece 11, the diaphragm 13, and the second pole piece 12 are stacked and repeatedly folded to form a continuous stack, and the first active region 1121 and the second active region 1221 are respectively located at non-folded portions of the continuous stack, and correspond to each other.

The laminated battery cell 1 disclosed in the embodiment of the application is a continuous laminated sheet formed by overlapping and repeatedly folding a first pole piece 11, a second pole piece 12 and a diaphragm 13 positioned between the first pole piece 11 and the second pole piece 12, wherein the first pole piece 11 and the second pole piece 12 can be a positive pole piece and a negative pole piece respectively or a negative pole piece and a positive pole piece respectively, and the diaphragm 13 separates the positive pole piece and the negative pole piece for being placed in an electrolytic cell for direct reaction and energy loss during electrolytic reaction; the first pole piece 11 includes a first current collector 111 and a first coating layer 112 disposed on the surface of the first current collector 111, where the first coating layer 112 includes a first active region 1121 and a first insulating region 1122 that are continuously and alternately disposed along the length direction of the first current collector 111, the first active region 1121 has an active material therein, and the first insulating region 1122 has an insulating material, the width of the first insulating region 1122 is equal to the width of the first current collector 111, specifically, the first coating layer 112 may be disposed on only one side surface of the first current collector 111, or may also be disposed on each side surface of the first current collector 111, and the laminated battery cell 1 may employ one first pole piece 11, or may also employ two or more first pole pieces 11, specifically, may be set according to actual situations; the second pole piece 12 includes a second current collector 121 and a second coating layer 122 disposed on the surface of the second current collector 121, where the second coating layer 122 includes a second active region 1221 and a second insulating region 1222 alternately disposed in the length direction of the second current collector 121, the second active region 1221 has active materials with opposite polarity to the first active region 1121, the second insulating region 1222 has insulating materials, the width of the second insulating region 1222 is equal to the width of the second current collector 121, specifically, the second coating layer 122 may be disposed on only one side surface of the second current collector 121, or may further have second coating layers 122 disposed on both side surfaces of the second current collector 121, and the laminated battery cell 1 may employ one second pole piece 12, or may further employ two or more first pole pieces 11, specifically, the number of the first pole pieces 11 and the second pole pieces 12 may be set according to the first current collector 111 and the second current collector 121, and the number of the first pole pieces 11 and the second pole pieces 12 may employ one side surface according to the first current collector 111 and the second current collector 121 The number of the first pole piece 11 and the second pole piece 12 may be equal or unequal, depending on the coating or the double-sided coating.

The repeated folding refers to that the folding can be continuously carried out according to a Z shape and an S shape to form a plurality of groups of opposite folding parts, so that mutual limiting can be realized, the dislocation of pole pieces is avoided, and the folding times can be set according to actual requirements; the first active region 1121 and the second active region 1221 of each layer of the folded continuous laminate correspond to each other and are located at the non-folded portion of the continuous laminate, so that the safety problem of the battery 100 caused by the first active region 1121 and the second active region 1221 located at the folded portion of the continuous laminate can be avoided; based on the corresponding relationship and position of the first active region 1121 and the second active region 1221 of the continuous laminate formed after folding, the arrangement areas of the active region and the insulating region in the coating layers of the first pole piece 11 and the second pole piece 12 can be specifically set according to the folding mode of forming the continuous laminate, the number of layers and the thickness of the first pole piece 11, the second pole piece 12 and the diaphragm 13, the thickness of the active region and the insulating region, and the like.

The continuous lamination formed by overlapping and repeatedly folding the first pole piece 11, the diaphragm 13 and the second pole piece 12 is adopted, a plurality of groups of opposite folding parts formed by repeated folding can be mutually limited, the pole pieces are prevented from being misplaced, the lithium precipitation risk can be reduced, the pole pieces of the laminated battery core 1 can be cut by the continuous lamination, and the probability that burrs penetrate the diaphragm 13 too much at the cutting position can be reduced; by arranging the active material at intervals, the first coating layer 112 of the first pole piece 11 is arranged to include the first active regions 1121 and the first insulation regions 1122 which are continuously and alternately arranged, the second coating layer 122 of the second pole piece 12 is arranged to include the second active regions 1221 and the second insulation regions 1222 which are continuously and alternately arranged, and when the continuous lamination is formed by folding, the first active regions 1121 and the second active regions 1221 respectively correspond to each other and are both positioned at the non-folding part of the continuous lamination, and the first insulation regions 1122 and the second insulation regions 1222 correspond to the folding part, the problem of falling off caused by the active material positioned at the folding part can be avoided, and the arrangement of the insulation regions can reduce the possibility of the folding part of the current collector breaking, thereby reducing the risk of the folding part breaking and piercing the diaphragm 13, and can avoid the risk of direct lap joint of the negative active material and the positive current collector and causing fire when the diaphragm 13 shrinks, the safety can be improved.

Optionally, with continued reference to fig. 4, as shown in the figures, the first and

second insulation regions

1122, 1222 correspond to folded portions of the continuous laminate, with the folded portions being fold lines about centerlines of the first and

second insulation regions

1122, 1222 that are perpendicular to the length direction of the first and second

current collectors

111, 121.

While ensuring that the first and second

active regions

1121, 1221 are corresponding and located in the non-folded portion of the continuous laminate, the first and

second insulation regions

1122, 1222 correspond to the folded portion of the continuous laminate, and are repeatedly folded with the center lines of the first and

second insulation regions

1122, 1222 perpendicular to the length direction of the first and second

current collectors

111, 121 as folding lines, and when the folding is performed, the center lines of the corresponding first and

second insulation regions

1122, 1222 are in corresponding positions and overlap.

Repeated folding with the center lines of the first and second insulating

regions

1122, 1222 as fold lines to form a continuous laminate helps ensure the right correspondence of the first and second

active regions

1121, 1221 and the regularity of multiple folding to avoid the occurrence of lithium deposition.

Optionally, according to some embodiments of the present application, the first and second insulating

regions

1122, 1222 are partially located in the non-folded portion of the continuous lamination.

On the basis of the arrangement that the first and second insulating

regions

1122 and 1222 correspond to the non-laminated regions of the continuous laminated sheets, the first and second insulating

regions

1122 and 1222 may be further arranged to correspond to the non-laminated regions of the continuous laminated sheets, that is, the non-folded flat portions of the continuous laminated sheets also have the first and second insulating

regions

1122 and 1222 arranged to be portions, so that it is possible to prevent the joining position of the insulating regions and the active regions from being just in the joining position of the folded portions and the non-folded portions, thereby reducing the risk of tape breakage, and since the active material coated region of the negative electrode sheet is larger than the active material coated region of the positive electrode sheet, the insulating region of the flat portion can prevent the risk of fire from being generated by the direct joining of the negative electrode active material and the positive electrode collector after the separator 13 is shrunk.

By providing the insulating region portion at the non-folded portion of the continuous laminate, the safety of the battery 100 can be effectively improved.

According to some embodiments of the present application, optionally, the number of the first pole piece 11 is one, and one side surface has a first coating layer 112; the number of the second pole pieces 12 is one, and one side surface has a second coating layer 122.

During manufacturing, the first active region 1121 and the first insulation region 1122 may be continuously and alternately formed on a side surface of the first current collector 111, and a first tab is welded to form a first pole piece 11, the second active region 1221 and the second insulation region 1222 are continuously and alternately formed on a side surface of the second current collector 121, and a second tab is welded to form a second pole piece 12, the first pole piece 11, the diaphragm 13, and the second pole piece 12 are sequentially stacked by a stacking mechanism and then repeatedly folded to form a continuous stacked cell 1, and then according to a manufacturing process of the lithium ion battery 100, the stacked cell 1 is loaded into the housing 3, and an electrolyte is injected to form the battery cell 10.

Can adopt the diaphragm 13 continuous folding formation laminated battery core 1 of a first pole piece 11 and a second pole piece 12 and the two of unilateral coating respectively, it is spacing each other to utilize the folding part, avoids the pole piece dislocation phenomenon to appear, can reduce and analyse the lithium risk, and continuous lamination can reduce the number of times of cutting of laminated battery core 1's pole piece, can reduce the probability that the position burr of cutting impales diaphragm 13 excessively, improves the security.

According to some embodiments of the present application, optionally, referring to fig. 4 again, the number of the first pole piece 11 is at least one, and both side surfaces of the first current collector 111 are respectively provided with a first coating layer 112; the number of the second pole pieces 12 is more than that of one of the first pole pieces 11, one side surface of the second current collector 121 of two of the second pole pieces 12 has a second coating layer 122, and two side surfaces of the second current collectors 121 of the remaining second pole pieces 12 respectively have second coating layers 122.

The laminated battery cell 1 disclosed in this embodiment may also be a positive-negative multilayer laminated battery cell, and specifically, at least one first pole piece 11 may be used, and the surfaces of both sides of a first current collector 111 of the first pole piece 11 are respectively provided with a first coating layer 112, and second pole pieces 12 whose number is one more than that of the first pole piece 11 are used, that is, at least two second pole pieces 12, where the surfaces of one side of second current collectors 121 of two second pole pieces 12 are provided with the first coating layer 112, and the surfaces of both sides of second current collectors 121 of the remaining second pole pieces 12 are respectively provided with a second coating layer 122; for example: referring to fig. 4, when one first pole piece 11 and two second pole pieces 12 are used, the two second pole pieces 12 are respectively disposed on two sides of the first pole piece 11 for overlapping, and the diaphragms 13 are respectively disposed between the two second pole pieces 12 and the first pole piece 11 for separation, one side of the second current collector 121 of the two second pole pieces 12, which is disposed with the second coating layer 122, faces the first pole piece 11, and the overlapping and the repeated folding are performed; or, when two first pole pieces 11 are used, three second pole pieces 12 need to be used, wherein the single-side surfaces of the two second pole pieces 12 have the second coating layer 122, the two second pole pieces 12 are located at the outer sides of the two first pole pieces 11, the other second pole piece 12 is located between the two first pole pieces 11, the two side surfaces thereof have the second coating layers 122, and the positions between the second pole pieces 12 and the first pole pieces 11 need to be separated by the diaphragms 13.

Form multilayer lamination formula electricity core 1 and help reduce cost, improve electric core preparation efficiency to utilize the folding part can be spacing each other, avoid the pole piece dislocation phenomenon to appear, can reduce the lithium risk of educing, and the lamination can reduce the number of times of cutting of the pole piece of lamination formula electricity core 1 in succession, can reduce the probability that the position burr of cutting impales diaphragm 13 too much, improves the security.

According to some embodiments of the present application, optionally, referring again to fig. 4, in the length direction of the first current collectors 111, each of the first active regions 1121 respectively has the same length, and each of the first insulating regions 1122 respectively has the same length.

When the multilayer structure is stacked and folded, a certain length difference exists between the inner layer and the outer layer, and in order to reduce the manufacturing difficulty, the first pole piece 11 may be folded based on the first pole piece 11, that is, in the length direction of the first current collector 111, the length of each first active region 1121 on the first current collector 111 of the first pole piece 11 may be set to be the same, and the length of each first insulating region 1122 is the same; specifically, the length of each first active region 1121 may be determined according to parameters such as the length difference between the first active region 1121 and the second active region 1221, the length of the second insulating region 1222, and the thicknesses of the first current collector 111, the second current collector 121, and the separator 13, so as to increase the energy density of the battery cell, and to ensure that the first active region 1121 can be folded as short as possible.

Such design helps reducing the electric core preparation degree of difficulty, improves the energy density of electric core preparation efficiency and electric core.

According to some embodiments of the present application, optionally, referring to fig. 4 and 5, as shown in the figure, in the length direction of the second current collector 121, each of the second active regions 1221 has the same length, and the plurality of second insulation regions 1222 includes inner insulation regions 1222a and outer insulation regions 1222b having a length greater than that of the inner insulation regions 1222a, which are alternately arranged; in the continuous lamination, the inner insulating regions 1222a are located inside the corresponding first insulating regions 1122, and the outer insulating regions 1222b are located outside the corresponding first insulating regions 1122.

Based on the above-mentioned design that the first coating layers 112 of the first pole piece 11 are arranged to have the same length for each first active region 1121 and the same length for each first insulation region 1122, each second active region 1221 is arranged to have the same length in the length direction of the second current collector 121, and since the second insulation region 1222 is located at the folded position, the second insulation region 1222 has a portion folded to the inside of the first insulation region 1122 and a portion wrapped around the outside of the first insulation region 1122 with a difference in length when repeatedly folded, based on which, referring to fig. 2, the plurality of second insulation regions 1222 includes alternating inside insulation regions 1222a and outside insulation regions 1222b, and the length of the outside insulation region 1222b is greater than the arrangement length of the inside insulation regions 1222a, and the inside insulation region 1222a of the second insulation region 1222 is located to the inside of the corresponding first insulation region 1122 when forming a continuous lamination, the outside region of the second insulation region 1222 wraps the outside of the corresponding first insulation region 1122; specifically, in order to increase the energy density of the battery cell, the length of the inner insulating region 1222a of the second insulating region 1222 may be set to be not greater than 2mm, and the length of the outer insulating region 1222b may be set according to the length of the first insulating region 1122, and the number of layers and the thickness of the first current collector 111, the second current collector 121, and the separator 13, and the length of the outer insulating region 1222b may be reduced as much as possible while ensuring that the battery cell can be folded.

Such a design is helpful for ensuring the right-facing correspondence relationship between the first active region 1121 and the second active region 1221, and can reduce the difficulty in manufacturing a battery cell and improve the battery cell manufacturing efficiency and the energy density of the battery cell.

According to some embodiments of the present application, optionally, please refer to fig. 4 again, as shown in the figure, the first pole piece 11 is a positive pole piece, the second pole piece 12 is a negative pole piece, and the second active region 1221 corresponds to the first active region 1121 in an interference manner.

The first electrode plate 11 may be a positive electrode plate, the second electrode plate 12 may be a negative electrode plate, specifically, the first current collector 111 of the first electrode plate 11 may be an aluminum foil, and plays a role in carrying the first coating layer 112 and conducting current, and the active material in the first active region 1121 of the first coating layer 112 may be an oxidant having a positive potential and stable in an electrolyte, such as metal oxides of manganese dioxide, lead dioxide, nickel oxide, and the like, oxygen or air, halogens and salts thereof, oxygen-containing acids and salts thereof, and the like; the second current collector 121 of the second pole piece 12 may be a copper foil, and plays a role in carrying the second coating layer 122 and conducting current, and the active material in the second active region 1221 of the second coating layer 122 may be graphite; the interference correspondence of the second active region 1221 with the first active region 1121 means: the second active region 1221 directly corresponds to the first active region 1121, and the area of the second active region 1221 is larger than the area of the first active region 1121, so that it can be ensured that, in electrolysis, all of the lithium ions electrolyzed by the positive electrode sheet can reach the coating region of the negative electrode active material of the negative electrode sheet directly facing thereto.

By making the negative electrode active material in interference and opposite correspondence to the positive electrode active material, it can be ensured that during electrolysis, lithium ions electrolyzed by the positive electrode plate can all reach the coating area of the negative electrode active material of the negative electrode plate opposite to the positive electrode plate, and all participate in the electrolysis reaction, thereby avoiding the problems of short circuit of the battery 100 and the like caused by burrs generated by precipitation of the lithium ions, and improving the safety of the battery 100.

According to some embodiments of the present application, optionally, referring to fig. 4 again, the first coating layer 112 includes a first active material layer and a first insulating layer that are continuously and alternately disposed, and corresponding regions of the first active material layer and the first insulating layer are a first active region 1121 and a first insulating region 1122, respectively; the second coating layer 122 includes a second active material layer and a second insulating layer alternately disposed in series, and regions corresponding to the second active material layer and the second insulating layer are a second active region 1221 and a second insulating region 1222, respectively.

In order to form the first coating layer 112 including the first active region 1121 and the first insulation region 1122 which are continuously and alternately coated, a first active material layer and a first insulation layer may be continuously and alternately coated on the surface of the first current collector 111, where the first active material layer is located in a region which is the first active region 1121, the first insulation layer is located in a region which is the first insulation region 1122, and no gap is left between the first active material layer and the first insulation layer; similarly, to form the second coating layer 122 including the second active regions 1221 and the second insulating regions 1222 which are continuously and alternately coated, a second active material layer and a second insulating layer may be continuously and alternately coated on the surface of the second current collector 121, where the second active material layer is located in the second active region 1221, the second insulating layer is located in the second insulating region 1222, and no gap is left between the second active material layer and the second insulating layer.

Specifically, the first active material layer and the second active material layer are formed by mixing a positive electrode/negative electrode active material, a binder, a conductive agent and the like to prepare slurry, coating the slurry on the surface of a current collector, and drying the current collector and removing a solvent; the first insulating layer and the second insulating layer may be, but not limited to, one of a ceramic coating, a polymer coating, and an insulating tape, wherein a ceramic material forming the ceramic coating may be, but is not limited to, one or a combination of several of hydrated alumina, magnesia, silicon carbide, and silicon nitride, and a polymer material forming the polymer coating may be, but is not limited to, at least one of polyvinylidene fluoride and polyacrylonitrile.

The active region and the insulating region may be formed alternately by alternately disposing the active material layer and the insulating layer so that the active material can be sufficiently utilized.

According to some embodiments of the present application, optionally, the first active material layer and the first insulating layer have a first overlap region, and the second active material layer and the second insulating layer have a second overlap region; the length of the first and second overlapping areas is not greater than 0.5mm in the length direction of the first and second

current collectors

111 and 121.

In order to reduce the manufacturing difficulty and ensure the gapless connection between the active region and the insulating region, the first active material layer and the first insulating layer may have a first overlapping region, and the second active material layer and the second insulating layer may have a second overlapping region, where the first overlapping region may be a region where the first insulating layer is overlapped on the first active material layer, the second overlapping region may be a region where the second insulating layer is overlapped on the second active material layer, and in order to increase the energy density of the battery cell, the length of the first overlapping region and the length of the second overlapping region may be limited to be not more than 0.5 mm.

When the active substance and the insulating material are coated alternately, the overlapping area is formed between the active substance and the insulating material, so that the active region and the adjacent insulating region can be in gapless connection, and the manufacturing process difficulty is reduced.

According to some embodiments of the present application, optionally, with continued reference to fig. 4, as shown therein, the thickness of the first insulating layer is not greater than the thickness of the first active material layer; the thickness of the second insulating layer is not greater than the thickness of the second active material layer.

In order to improve the flatness of the first pole piece 11 and the second pole piece 12, the thickness of the first insulating layer may be further defined to be equal to the thickness of the first active material layer, so that the heights of the first insulating layer and the first active material layer are flush, or the thickness of the first insulating layer is defined to be smaller than the thickness of the first active material layer; similarly, the thickness of the second insulating layer may be defined to be equal to the thickness of the second active material layer so as to be flush with the height of the second active material layer, or the thickness of the second insulating layer may be defined to be smaller than the thickness of the second active material layer.

Such a design may improve the flatness of the cell, which is also advantageous for improving the energy density of the battery 100.

According to some embodiments of the present application, optionally, the first coating layer 112 includes a first active material layer coated continuously, and first insulating layers formed on the first active material layer at intervals, a region corresponding to the first insulating layer in the first coating layer 112 is a first insulating region 1122, and the remaining regions are first active regions 1121; the second coating layer 122 includes a second active material layer coated continuously, and a second insulating layer formed on the second active material layer at intervals, where a region corresponding to the second insulating layer in the second coating layer 122 is a second insulating region 1222, and the remaining region is a second active region 1221.

To form the first coating layer 112 including the first active regions 1121 and the first insulation regions 1122 which are continuously alternated, and a second coating layer 122 including second active regions 1221 and second insulating regions 1222 alternately in succession, the first active material layer may be continuously coated on the surface of the first current collector 111 in addition to the above-described interval coating manner, and a first insulating layer is disposed on the first active material layer at an interval, a region corresponding to the first insulating layer is a first insulating region 1122, a region not disposed with the first insulating layer but coated with only the first active material layer is a first active region 1121, and similarly, a second active material layer may be continuously coated on the surface of the second current collector 121, and second insulating layers may be disposed on the second active material layer at intervals, where a region corresponding to the second insulating layer is the second insulating region 1222, and a region where the second insulating layer is not disposed and only the second active material layer is coated is the second active region 1221; specifically, the first insulating layer and the second insulating layer may be, but not limited to, insulating tape layers.

By continuously coating the active material layer and arranging the insulating layers on the active material layer at intervals to form the alternating active area and the insulating area, the insulating area and the active area can be ensured to be in gapless connection, the manufacturing process can be simplified, and the manufacturing efficiency of the battery cell is improved.

According to some embodiments of the present application, optionally, referring again to fig. 4, the first pole piece 11, the diaphragm 13 and the second pole piece 12 are folded repeatedly in a Z-shape after being stacked.

In order to form continuous lamination, the first pole piece 11, the diaphragm 13 and the second pole piece 12 can be folded repeatedly according to the Z shape after being overlapped, a plurality of folding parts which are staggered and opposite can be formed after the folding, and the folding parts can be mutually limited so as to reduce the probability of dislocation of the pole pieces and the risk of lithium precipitation.

The folding parts formed by Z-shaped repeated folding can limit each other, and dislocation of the pole pieces is avoided.

According to some embodiments of the present application, the present application also provides a battery cell 10 including the laminated battery cell 1 in any one of the above aspects.

The present application also provides, according to some embodiments of the present application, a battery 100 comprising: a plurality of battery cells 10 according to any of the above aspects.

According to some embodiments of the present application, there is also provided a power utilization device, comprising: in the battery 100 according to any of the above embodiments, the battery 100 is used for supplying electric energy to an electric device.

According to some embodiments of the present application, referring to fig. 4 to 5, the present application provides a laminated electrical core 1, which employs a first pole piece 11, where the first pole piece 11 is a positive pole piece, and includes a first current collector 111 and first coating layers 112 disposed on both side surfaces of the first current collector 111, the first coating layers 112 include first active regions 1121 and first insulation regions 1122 formed by continuously and alternately coating positive active materials and insulation materials, a thickness of the first current collector 111 is 0.013mm, a thickness of the first active regions 1121 is 0.05mm, a length of each first active region 1121 is 200mm, and a length of each first insulation region 1122 is 11 mm; two second pole pieces 12 are adopted, each second pole piece 12 is a negative pole piece and comprises a second current collector 121 and a second coating layer 122 arranged on one side surface of the second current collector 121, each second coating layer 122 comprises a second active area 1221 and a second insulating area 1222 formed by continuously and alternately coating a negative pole active substance and an insulating material, each second insulating area 1222 comprises an inner insulating layer and an outer insulating layer, the inner insulating layers are folded to form continuous lamination and then folded to the inner side of the first insulating layer, the outer insulating layers wrap the outer side of the first insulating layer, the thickness of each second current collector 121 is 0.006mm, the thickness of each second active area 1221 is 0.07mm, the length of each second active area 1221 is 210mm, the length of each inner insulating layer is 1mm, and the length of each outer insulating layer is 5 mm; two layers of diaphragms 13 are adopted and respectively spaced between the two second pole pieces 12 and the two side surfaces of the first pole piece 11, and the thickness of the diaphragms 13 is 0.01 mm. Superposing a first pole piece 11, two layers of diaphragms 13 and two second pole pieces 12, and repeatedly folding the first pole piece 11, the two layers of diaphragms 13 and the two second pole pieces 12 in a Z-shape by taking the central lines of the corresponding first insulating regions 1122 and second insulating regions 1222 as folding lines to form a continuous lamination, wherein the second active regions 1221 of the continuous lamination are in interference and are opposite to the corresponding first active regions 1121, the first active regions 1121 and the second active regions 1221 are positioned at non-folding parts of the continuous lamination, and the first insulating regions 1122 and the second insulating regions 1222 are positioned at folding parts of the continuous lamination and are partially positioned at the non-folding parts; the plurality of folding parts of the continuous lamination can be utilized to realize a limiting effect, the lithium precipitation risk caused by the displacement of the first pole piece 11 and the second pole piece 12 is avoided, the cutting times of the pole pieces can be reduced by the continuous lamination, the probability of short circuit caused by trimming burrs is reduced, and the safety performance of the battery 100 is improved.

According to some embodiments of the present application, the present application provides a battery cell 10, which can adopt the laminated battery core in any of the above solutions, after the laminated battery core is manufactured, the laminated battery core, the electrolyte and the like are accommodated in the internal environment of the middle casing 3, and the opening of the casing is covered by the cap assembly 2, so that the battery cell 10 can be obtained, a plurality of battery cells 10 can constitute the battery 100, and the battery 100 can be used as a power supply system of an electric device.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

Claims

1. A laminated cell, comprising: the diaphragm is positioned between the first pole piece and the second pole piece;

the first coating layer on the surface of the first current collector of the first pole piece comprises a first active area and a first insulating area which are continuously and alternately arranged along the length direction of the first active area;

the second coating layer on the surface of the second current collector of the second pole piece comprises a second active area and a second insulating area which are continuously and alternately arranged along the length direction of the second active area;

wherein the first pole piece, the diaphragm, and the second pole piece are stacked and repeatedly folded to form a continuous stack, and the first active region and the second active region are respectively located at non-folded portions of the continuous stack and correspond to each other.

2. The laminated cell of claim 1, wherein the first and second insulating regions correspond to folded portions of the continuous laminate, and the folded portions are folded about a centerline of the first and second insulating regions that is perpendicular to a length direction of the first and second current collectors.

3. The laminated cell of claim 2, wherein the first and second insulating region portions are located at the non-folded portion of the continuous laminate.

4. The laminated cell of claim 1, wherein,

the number of the first pole pieces is one, and one side surface of the first current collector is provided with the first coating layer;

the number of the second pole piece is one, and one side surface of the second current collector is provided with the second coating layer.

5. The laminated cell of claim 1, wherein,

the number of the first pole pieces is at least one, and the surfaces of two sides of the first current collector are respectively provided with the first coating layers;

the number of the second pole pieces is more than that of the first pole pieces, one side surface of the second current collector of two of the second pole pieces is provided with the second coating layer, and the two side surfaces of the second current collector of the rest second pole pieces are respectively provided with the second coating layer.

6. The laminated cell of claim 4 or 5, wherein the first active regions each have the same length and the first insulating regions each have the same length in a direction of the length of the first current collectors.

7. The laminated cell of claim 6, wherein each of the second active regions has the same length in a length direction of the second current collectors, and the second active regions comprise inner insulating regions and outer insulating regions with lengths larger than the inner insulating regions, which are alternately arranged;

In the continuous stack, the inner insulation region is located inside the corresponding first insulation region, and the outer insulation region is located outside the corresponding first insulation region.

8. The laminated cell of any of claims 1, 2, 3, 4, 5, and 7, wherein the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, and the second active region interference corresponds to the first active region.

9. The laminated cell of claim 1, wherein,

the first coating layer comprises a first active material layer and a first insulating layer which are continuously and alternately arranged, and the areas corresponding to the first active material layer and the first insulating layer are a first active area and a first insulating area respectively;

the second coating layer comprises a second active material layer and a second insulating layer which are continuously and alternately arranged, and the regions corresponding to the second active material layer and the second insulating layer are a second active region and a second insulating region respectively.

10. The laminated cell of claim 9, wherein,

the first active material layer and the first insulating layer have a first overlapping region, and the second active material layer and the second insulating layer have a second overlapping region;

The length of the first and second overlapping regions is no greater than 0.5mm in the length direction of the first and second current collectors.

11. The laminated cell of claim 9, wherein,

the thickness of the first insulating layer is not more than that of the first active material layer;

the thickness of the second insulating layer is not greater than the thickness of the second active material layer.

12. The laminated cell of claim 1, wherein the first coating layer comprises a first active material layer coated continuously, and a first insulating layer formed on the first active material layer at intervals, and a corresponding area of the first insulating layer in the first coating layer is the first insulating region, and the rest area is the first active region;

the second coating layer comprises a second active material layer coated continuously and a second insulating layer formed on the second active material layer at intervals, wherein a region corresponding to the second insulating layer in the second coating layer is the second insulating region, and the rest region is the second active region.

13. The laminated cell of claim 1, wherein the first pole piece, the separator, and the second pole piece are stacked and then repeatedly folded in a Z-shape.

14. A battery cell, comprising: the laminated cell of any of claims 1-13.

15. A battery, comprising: a plurality of the battery cells of claim 14.

16. An electric device, comprising: the battery of claim 15.