Patent Description:
With the aggravation of environmental pollution, new energy industry is attracting more and more attention. As an important part of many electronic products, energy storage products and electric vehicles, the performance of a lithium battery will directly affect the promotion and the use of related products. According to an outsourcing material of the lithium battery, the lithium battery can be mainly classified into two types: a metal casing battery cell and a soft wrapping battery cell.

For the metal casing battery cell, in order to insulate and isolate the metal casing from the outside world, it is usually necessary to wrap the metal casing with an insulating film.

However, a current insulating film may not be able to realize the sealed wrapping of a wrapping area when wrapping a battery cell. The current insulation film usually has the problem of water permeability after wrapping the battery, resulting in poor waterproof performance of the insulating film.

<CIT> discloses an electrically insulating film, in which the first side surface covering portion includes a main-surface-side covering portion, and a side-surface-side covering portion. The protruding width of the main-surface-side covering portion is dimensioned equal to the protruding width of the side-surface-side covering portion. The superposed part of the first and second side surface covering portions is welded and made watertight.

<CIT> discloses a battery protection piece. The battery protection piece comprise a plurality of protection regions and a plurality of folding regions, wherein the protection piece is of an integrated structure, an accommodating cavity matched with the shape of a battery is formed when the protection piece is folded along the folding regions according to a preset mode so as to wrap and accommodate the battery, the thicknesses of the folding regions are lower than those of the protection regions, and the flexibility of the folding regions is higher than that of the protection region.

<CIT> discloses a rectangular secondary battery in which six faces of a battery container are covered with one sheet of insulating film. Ends of the insulating film are overlapped with each other, and the insulating film continuously covers mutually adjacent faces having each of ridges between the faces of the battery container.

The present application provides an insulating film, a battery cell, a battery, a power consumption device, and a method and device for producing a battery cell, which can realize the sealed wrapping of a wrapping area.

In a first aspect, an insulating film is provided, which is configured to wrap a battery assembly, the insulating film includes a bottom coverage area, N side coverage areas and N pairs of bonding areas, wherein N is an integer larger than <NUM>; the bottom coverage area has N sides, the N side coverage areas are respectively connected to the bottom coverage area outside the N sides, and can respectively bend toward the bottom coverage area along the N sides; each pair of the N pairs of bonding areas is located between two adjacent side coverage areas of the N side coverage areas, and is connected to the two adjacent side coverage areas respectively; each pair of bonding areas is configured to make the bottom coverage area and the N sides coverage areas form a space wrapping the battery assembly by bonding surfaces on the same side of each pair of bonding areas when the N sides coverage areas bend toward the bottom coverage area; wherein a width of a first bonding area in each pair of bonding areas is greater than a width of a second bonding area, and after bonding, each pair of bonding areas can bend toward the side coverage area adjacent to the second bonding area, wherein a part that is not bonded with the second bonding area in the first bonding area is configured to bond to the side coverage area adjacent to the second bonding area.

In the technical solution of the embodiments of the present application, each pair of bonding areas is smoothly bonded without insufficient bonding areas, and there is no refolding inside the bonding area, so it is possible to realize the sealed wrapping of the wrapping area, which can improve the insulation performance and the waterproof performance. In this way, each pair of bonding areas can be prevented from tilting, which facilitates subsequent assembly and guarantees the wrapping effect.

In a possible implementation manner, each pair of bonding areas can respectively bend along the connecting side with the side coverage area to bond the surfaces on the same side of each pair of bonding areas. By bending along the connecting side, the bonding of the surfaces on the same side of each pair of bonding areas can be achieved, and there is no need to refold inside the bonding area, so a sealing effect can be ensured.

In a possible implementation manner, N is <NUM>, and the insulating film is configured to wrap a cuboid-shaped battery assembly.

In a possible implementation manner, the bottom coverage area and four side coverage areas are both rectangular, and the expanded state of the insulating film is a cross shape.

In a possible implementation manner, in the expanded state of the insulating film, each pair of bonding areas presents as an L shape.

In a possible implementation manner, the width of the first bonding area is less than one-half of the width of the side coverage area adjacent to the second bonding area. In this way, after each pair of bonding areas bonding to the side coverage area, a part of the area in the middle of the side coverage area will be exposed, that is, not covered by the bonding area. The exposed area in the middle of the side coverage area can be configured to bond with a side plate of a fixed battery cell, compared with the bonding area, the exposed area in the middle of the side coverage area has a better bonding effect when bonding with the side plate.

In a possible implementation manner, a material of the insulating film is a waterproof material. In this way, the waterproof performance of the battery assembly can be improved after the battery assembly is wrapped with the insulation film.

In a possible implementation manner, the battery assembly is the battery cell.

In a possible implementation manner, the battery assembly is a battery cell group, and the battery cell group assembly includes a plurality of adjacent battery cells. That is, a plurality of adjacent battery cells is wrapped with the above insulating film as a whole. For example, two battery cells are a group, and is wrapped with one insulating film. This can reduce the complexity of the wrapping and improve the assembly efficiency.

In a second aspect, a battery cell is provided, and the battery cell includes the insulating film in the above first aspect or any possible implementation manner of the first aspect.

In a possible implementation manner, N is <NUM>, and the battery cell is a cuboid with a bottom wall, two wide side walls, two narrow side walls and a cover plate; wherein an area of the wide side wall is greater than that of the narrow side wall, the bottom coverage area of the insulating film covers the bottom wall, four side coverage areas of the insulating film include two wide side coverage areas and two narrow side coverage areas, wherein an area of the wide side coverage area is greater than that of the narrow side coverage area, the two wide side coverage areas cover the two wide side walls respectively, and the two narrow side coverage areas cover the two narrow side walls respectively; in each of the four pairs of bonding areas of the insulating film, the width of the first bonding area adjacent to the wide side coverage area is greater than the width of the second bonding area adjacent to the narrow side coverage area, and each pair of bonding areas bends to the adjacent narrow side coverage area after bonding on a surface towards one side of the battery cell; the part that is not bonded with the second bonding area in the first bonding area bonds to the adjacent narrow side coverage area.

In a third aspect, a battery is provided, including: the battery cell in the above second aspect or any one of the possible implementation manners of the second aspect.

In a fourth aspect, a power consumption device is provided, including: the battery in the above third aspect, the battery is configured to provide electrical energy.

In a fifth aspect, a method for producing a battery cell is provided, including: providing the battery cell; providing the insulating film in the above first aspect or any possible implementation manner of the first aspect; using the insulating film to wrap the battery cell.

In a sixth aspect, a device for producing a battery cell is provided, including a module for executing the method provided in the above fifth aspect.

In order to illustrate the technical solution in the embodiments of the present application more clearly, brief description will be made below to the drawings required in the embodiments of the present application. Apparently, the drawings described below are some embodiments of the present application only, and other drawings could be obtained based on these drawings by those ordinary skilled in this field without creative efforts.

In the drawings, the drawings are not drawn to actual scale.

Implementations of the present application will be further described below in detail with reference to the drawings and embodiments. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the depiction of the present application, it is noted that unless otherwise defined, all technological and scientific terms used have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. The terms used are merely for the purpose of describing specific embodiments, but are not intended to limit the present application. The terms "including" and "having" and any variations thereof in the specification and the claims of the present application as well as the brief description of the drawings described above are intended to cover non-exclusive inclusion. "A plurality of' means more than two; and orientations or positional relationships indicated by terms such as "up", "down", "left", "right", "inside", and "outside" are merely for convenience of describing the present application and for simplifying the description, rather than for indicating or implying that an apparatus or element indicated must have a specific orientation, and must be constructed and operated in a specific orientation, which thus may not be understood as a limitation the present application. In addition, the terms "first", "second", and "third" are only intended for the purpose of description, and shall not be understood as an indication or implication of relative importance. "Vertical" is not strictly vertical, but within an allowable range of error. "Parallel" is not strictly parallel, but within an allowable range of error.

The phrase "embodiments" referred to in the present application means that the descriptions of specific features, structures, and characteristics in combination with the embodiments are included in at least an embodiment of the present application. The phrase at various locations in the specification does not necessarily refer to the same embodiment, or an independent or alternative embodiment exclusive of another embodiment. Those skilled in the art understand, in explicit and implicit manners, that an embodiment described in the present application may be combined with another embodiment.

The terms representing directions in the following description are all directions shown in the drawings, and limit the specific structure of the present application. In the description of the present application, it should be further noted that unless otherwise explicitly specified and defined, the terms "mounting", "connecting" and "connection" should be understood in a broad sense; for example, they may be a fixed connection, a detachable connection, or an integrated connection; may be a direct connection and may also be an indirect connection through an intermediate medium, or may be communication between the interiors of two elements. Those of ordinary skill in the art may appreciate the specific meanings of the foregoing terms in the present application according to specific circumstances.

An insulating film of the embodiment of the present application can be configured to wrap a battery assembly. The insulating film can be an insulating and waterproof material for insulating and waterproofing the battery assembly. The battery assembly can be a battery cell, or an assembly formed by the battery cell, for example, a battery cell group formed by a plurality of adjacent battery cells. In this case, the plurality of adjacent battery cells is wrapped with the insulating film of the embodiment of the present application as a whole. For convenience of description, the following embodiment takes the battery cell as an example for illustration, but the present application is not limited to this.

In order to meet different power demands, a battery may include a plurality of battery cells, where the plurality of battery cells may be in series connection, parallel connection or series-parallel connection. The series-parallel connection refers to a combination of series connection and parallel connection. The battery may also be referred to as a battery pack. Optionally, the plurality of battery cells may be first connected in series, in parallel or in series-parallel to form a battery module, and then a plurality of battery modules are connected in series, in parallel or in series-parallel to form the battery. That is, the plurality of battery cells may directly form the battery, or may first form the battery module, and then the battery module form the battery. The battery is further provided in a power consumption device to provide electrical energy for the power consumption device.

The battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium/lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which are not limited by the embodiments of the present application.

In order to insulate and isolate the battery cell from the outside world, it is usually necessary to wrap the battery cell with the insulating film. A wrapped insulating film can achieve the purpose of insulation and waterproofing at the same time. However, a current insulating film may not be able to realize the sealed wrapping of a wrapping area when wrapping the battery cell, resulting in poor waterproof performance of the insulating film. For example, at present, when the battery cell is wrapped with the insulating film, on the one hand, a thickness of a bonding surface may be inconsistent (for example, a part of the bonding surface is one layer and the other part is two layers), that is, the bonding surface is unsmooth, which may affect the bonding effect; on the other hand, the inside of an area after bonding may bend again, which may also affect the bonding effect, so that the sealed wrapping of the wrapping area cannot be realized.

In view of this, embodiments of the present application provide an insulating film, each pair of bonding areas is smoothly bonded without insufficient bonding when wrapping the battery cell, and there is no refolding inside the bonding area, so it is possible to realize the sealed wrapping of the wrapping area, which can improve the insulation performance and the waterproof performance.

The technical solutions described in the embodiments of the present application are all applicable to various apparatuses using batteries, such as mobile phones, portable devices, notebook computers, electromobiles, electronic toys, electric tools, electric vehicles, ships and spacecrafts. For example, the spacecrafts include airplanes, rockets, space shuttles and spaceships, and the like. For brief description, the following embodiments are all described by an example of an electric vehicle.

For example, as shown in <FIG> is a schematic structural diagram of a vehicle <NUM> according to an embodiment of the present application. The vehicle <NUM> may be a fuel-powered vehicle, a gas-powered vehicle or a new energy vehicle, and the new energy vehicle may be a battery electric vehicle, a hybrid vehicle, an extended-range vehicle, or the like. The vehicle <NUM> may be internally provided with a motor <NUM>, a controller <NUM> and a battery <NUM>, and the controller <NUM> is configured to control the battery <NUM> to supply power to the motor <NUM>. For example, the battery <NUM> may be disposed at the bottom, head or tail of the vehicle <NUM>. The battery <NUM> may be configured for power supply of the vehicle <NUM>. For example, the battery <NUM> may serve as an operation power source of the vehicle <NUM> for a circuit system of the vehicle <NUM>, for example, for a working power demand of the vehicle <NUM> during startup, navigation and running. In another embodiment of the present application, the battery <NUM> may be configured not only as an operation power supply of the vehicle <NUM>, but also as a driving power supply of the vehicle <NUM>, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle <NUM>.

In order to satisfy different power demands, the battery <NUM> may include a plurality of battery cells. For example, as shown in <FIG>, it is a schematic structural diagram of a battery <NUM> according to an embodiment of the present application. The battery <NUM> may include a plurality of battery cells <NUM>. The battery <NUM> may further include a box body <NUM> with a hollow structure inside, and the plurality of battery cells <NUM> are accommodated in the box body <NUM>. For example, the plurality of battery cells <NUM> are connected in series or in parallel or in a hybrid and are then placed in the box body <NUM>.

Optionally, the battery <NUM> may also include other structures, which will not be described in detail herein. For example, the battery <NUM> may also include a bus component. The bus component is configured to implement the electrical connection between the plurality of battery cells <NUM>, such as parallel connection, series connection or series-parallel connection. Specifically, the bus component may implement the electrical connection between the battery cells <NUM> by connecting electrode terminals of the battery cells <NUM>. Further, the bus component may be fixed to the electrode terminals of the battery cells <NUM> by means of welding. Electric energy of the plurality of battery cells <NUM> may be further led out through an electrically conductive mechanism passing through the box body. Optionally, the electrically conductive mechanism may also belong to the bus component.

According to different power requirements, the number of the battery cells <NUM> may be set as any value. The plurality of battery cells <NUM> may be connected in series or in parallel or in a hybrid manner to implement larger capacity or power. Since there may be many battery cells <NUM> included in each battery <NUM>, the battery cells <NUM> may be provided in groups for convenience of installation, and each group of battery cells <NUM> constitutes a battery module. The number of the battery cells <NUM> included in the battery module is not limited and may be set as required. The battery <NUM> may include a plurality of battery modules, and these battery modules may be connected in series, in parallel or in series and parallel.

<FIG> is a schematic diagram of a battery cell <NUM> in an embodiment of the present application. <FIG> takes an example that a battery cell <NUM> is cuboid, but this is not limited by the embodiment of the present application, that is, the battery cell may also have other shapes.

As shown in <FIG>, a battery cell <NUM> has six walls, that is, a bottom wall <NUM>, two wide side walls <NUM>, two narrow side walls <NUM> and a cover plate <NUM>. A chamber formed by the six walls is provided with an electrode assembly and electrolyte and the like of the battery cell in it. Two electrode terminals <NUM> are provided on the cover plate <NUM>, which are a positive electrode terminal and a negative electrode terminal respectively, and the electrode terminals <NUM> are electrically connected to the electrode assembly.

<FIG> shows a schematic diagram of an insulating film <NUM> according to an embodiment of the present application. As shown in <FIG>, the insulating film <NUM> includes a bottom coverage area <NUM>, N side coverage areas <NUM>-<NUM> and N pairs of bonding areas <NUM>-<NUM>. N is an integer greater than <NUM>. <FIG> takes an example that N is <NUM>, but this is not limited by the embodiment of the present application. Specifically, when N is <NUM>, the insulating film <NUM> can be configured to wrap a cuboid-shaped battery assembly, such as the battery cell <NUM> shown in <FIG>; when N is not <NUM>, the insulating film <NUM> can be used for wrapping an N prismatic-shaped battery assembly. Optionally, in the case that the battery cell <NUM> shown in <FIG> is wrapped, the side coverage areas <NUM> and <NUM> are wide side coverage areas, and the side coverage areas <NUM> and <NUM> are narrow side coverage areas.

The bottom coverage area <NUM> has N sides <NUM>-<NUM>, and the N side coverage areas <NUM>-<NUM> are respectively connected to the bottom coverage area <NUM> at the N sides <NUM>-<NUM>, and can bend toward the bottom coverage area <NUM> along the N sides <NUM>-<NUM> respectively. In other words, N side coverage areas <NUM>-<NUM> surround the bottom coverage area <NUM>, and each side coverage area can bend along its side connected to the bottom coverage area <NUM>. As shown in <FIG>, the side coverage area <NUM> can bend along the side <NUM>, the side coverage area <NUM> can bend along the side <NUM>, the side coverage area <NUM> can bend along the side <NUM>, and the side coverage area <NUM> can bend along the side <NUM>.

Each pair of the N pairs of bonding areas <NUM>-<NUM> is located between two adjacent side coverage areas of the N side coverage areas <NUM>-<NUM>, and is connected to the two adjacent side coverage areas respectively; each pair of bonding areas is configured to make the bottom coverage area <NUM> and the N sides coverage areas <NUM>-<NUM> form a space wrapping the battery assembly by bonding surfaces on the same side of each pair of bonding areas when the N sides coverage areas <NUM>-<NUM> bend toward the bottom coverage area <NUM>.

As shown in <FIG>, a pair of bonding areas <NUM>-<NUM> is located between the side coverage area <NUM> and the side coverage area <NUM>, the bonding area <NUM> is connected to the side coverage area <NUM>, and the bonding area <NUM> is connected to the side coverage area <NUM>; a pair of bonding areas <NUM>-<NUM> is located between the side coverage area <NUM> and the side coverage area <NUM>, the bonding area <NUM> is connected to the side coverage area <NUM>, and the bonding area <NUM> is connected to the side coverage area <NUM>; a pair of bonding areas <NUM>-<NUM> is located between the side coverage area <NUM> and the side coverage area <NUM>, the bonding area <NUM> is connected with the side coverage area <NUM>, and the bonding area <NUM> is connected with the side coverage area <NUM>; a pair of bonding areas <NUM>-<NUM> is located between the side coverage area <NUM> and the side coverage area <NUM>, the bonding area <NUM> is connected to the side coverage area <NUM>, and the bonding area <NUM> is connected to the side coverage area <NUM>.

When the side coverage areas <NUM>-<NUM> bend toward the bottom coverage area <NUM>, the surfaces on the same side of the bonding area <NUM> and the bonding area <NUM> (a side toward the battery cell) are bonded. Similarly, the bonding area <NUM> and the bonding area <NUM> are bonded, the bonding area <NUM> and the bonding area <NUM> are bonded, and the bonding area <NUM> and the bonding area <NUM> are bonded, so that the bottom coverage area <NUM> and the side coverage areas <NUM>-<NUM> form a space for wrapping the battery assembly.

Optionally, when N is <NUM>, the bottom coverage area <NUM> and four side coverage areas <NUM>-<NUM> are both square, and the expanded state of the insulating film <NUM> is a cross shape. Optionally, in the expanded state of the insulating film <NUM>, each pair of bonding areas presents as an L shape. As shown in <FIG>, the bonding area <NUM> and the bonding area <NUM> form an L shape, the bonding area <NUM> and the bonding area <NUM> form an L shape, the bonding area <NUM> and the bonding area <NUM> form an L shape, and the bonding area <NUM> and the bonding area <NUM> form an L shape.

Optionally, as an example, if a length of a wrapped cuboid-shaped battery cell is L, a height is H, and a width is T, sizes of each section of the insulating film <NUM> in <FIG> can adopt the sizes in Table <NUM>.

Optionally, each pair of bonding areas may respectively bend along the connecting side with the side coverage area to bond surfaces on the same side of each pair of bonding areas. For example, the bonding area <NUM> can bend along the side <NUM>, the bonding area <NUM> can bend along the side <NUM>, the bonding area <NUM> can bend along the side <NUM>, the bonding area <NUM> can bend along the side <NUM>, the bonding area <NUM> can bend along the side <NUM>, the bonding area <NUM> can bend along the side <NUM>, the bonding area <NUM> can bend along the side <NUM>, and the bonding area <NUM> can bend along the side <NUM>.

Taking the battery cell including the one shown in <FIG> as an example, <FIG> is a schematic diagram before wrapping, and <FIG> is a schematic diagram after each pair of bonding areas is bonded. As shown in <FIG>, after each pair of bonding areas are bonded, the sealing of one edge of the wrapping area can be realized. One pair of bonding areas of the sealing interface at each edge are smoothly bonded without insufficient bonding, so the sealed wrapping of the wrapping area can be realized.

Optionally, in an embodiment of the present application, a width of a first bonding area in each pair of bonding areas is greater than a width of a second bonding area, and after bonding, each pair of bonding areas can bend toward the side coverage area adjacent to the second bonding area, wherein a part that is not bonded with the second bonding area in the first bonding area is configured to bond to the side coverage area adjacent to the second bonding area.

For example, for the bonding area <NUM> and the bonding area <NUM>, a width of the bonding area <NUM> is greater than a width of the bonding area <NUM>, that is, the bonding area <NUM> is the first bonding area, and the bonding area <NUM> is the second bonding area. As shown in <FIG>, after the bonding area <NUM> and the bonding area <NUM> are bonded, they can bend toward the side coverage area <NUM>. Since the width of the bonding area <NUM> is greater than the width of the bonding area <NUM>, a part of the bonding area <NUM> will not be bonded to the bonding area <NUM>, and this part of the area can be configured to bond to the side coverage area <NUM> again, so that to prevent the bonding area <NUM> and the bonding area <NUM> from tilting. Other bonding areas are similar to this, and the schematic diagram after bonding is shown in <FIG>.

In the embodiment of the present application, each pair of bonding areas bents toward the side coverage area bonding as a whole after bonding, and there is no folding inside the bonding area, so that the sealing effect can be ensured. For example, if the inside of the bonding area is refolded, the bonding at a crease may be loosened, thereby affecting the sealing effect.

Optionally, in an embodiment of the present application, the width of the first bonding area is less than one-half of the width of the side coverage area adjacent to the second bonding area. For example, in <FIG>, f is less than d/<NUM>.

Still taking the bonding area <NUM> as the first bonding area and the bonding area <NUM> as the second bonding area as an example, the width of the bonding area <NUM> is less than one-half of the width of the side coverage area <NUM>. As shown in <FIG>, in this case, after the bonding area <NUM> and the bonding area <NUM> are bonded and then bonded to the side coverage area <NUM> again, a part of the middle of the side coverage area <NUM> will be exposed, that is, it is not covered by the bonding area <NUM> and the bonding area <NUM> cover. The exposed area in the middle of the side coverage area <NUM> can be configured to bond with a side plate of a fixed battery cell; compared with the bonding area <NUM>, the exposed area <NUM> in the middle of the side coverage area has a better bonding effect when bonding with the side plate.

Optionally, in an embodiment of the present application, a height of the side coverage area may be equal to or higher than a height of the battery cell. When the height of the side coverage area is higher than the height of the battery cell, the higher part can bend toward the cover plate of the battery cell and bond with the surface of the cover plate of the battery cell.

As shown in <FIG>, the height of the side coverage areas <NUM>-<NUM> is higher than the height of the battery cell <NUM>. The higher part then bends toward the cover plate <NUM> of the battery cell <NUM> and bonds with the surface of the cover plate <NUM> of the battery cell <NUM>, so as to obtain the wrapping state as shown in <FIG>.

In the technical solution of the embodiment of the present application, all the bonding areas are smoothly bonded without insufficient bonding, and there is no refolding inside the bonding area, so it is possible to realize the sealed wrapping of the wrapping area, which can improve the insulation performance and the waterproof performance.

An embodiment of the present application also provides a battery cell wrapped with the above insulating film <NUM>. For example, the battery cell may be the above battery cell <NUM>. In this case, the bottom coverage area <NUM> of the insulating film <NUM> covers the bottom wall <NUM> of the battery cell <NUM>, four side coverage areas of the insulating film include two wide side coverage areas <NUM> and <NUM>, and two narrow side coverage areas <NUM> and <NUM>, two wide side coverage areas <NUM> and <NUM> cover the two wide side walls <NUM> respectively, and the two narrow side coverage areas <NUM> and <NUM> cover the two narrow side walls <NUM> respectively; in each of the four pairs of bonding areas of the insulating film <NUM>, the width of the first bonding area adjacent to the wide side coverage area is greater than the width of the second bonding area adjacent to the narrow side coverage area, and each pair of bonding areas bends to the adjacent narrow side coverage area after bonding on a surface towards one side of the battery cell; the part that is not bonded with the second bonding area in the first bonding area bonds to the adjacent narrow side coverage area. The state of the battery cell <NUM> after wrapping with the insulating film <NUM> can be referred to <FIG>.

The process of wrapping the battery cell <NUM> with the insulating film <NUM> will be described below with reference to <FIG>.

The battery cell <NUM> is placed on the insulating film <NUM>, the bottom coverage area <NUM> of the insulating film <NUM> covers the bottom wall <NUM> of the battery cell <NUM>, and the state shown in <FIG> is obtained.

The side coverage area bends along the side of the bottom coverage area <NUM> toward the battery cell <NUM>, for example, the wide side coverage areas <NUM> and <NUM> can be firstly bended, and then bend the two narrow side coverage areas <NUM> and <NUM>, at the same time, bend the bonding area along the connecting side between the bonding area and the side coverage area, so that surfaces of each pair of bonding areas towards the side of the battery unit <NUM> are bonded to obtain the state shown in <FIG>.

Each pair of bonding areas bend to the adjacent narrow side coverage area as a whole and is bonded to the adjacent narrow side coverage area to obtain the state as shown in <FIG>.

The part of cover plate <NUM> protruding from each area in the direction of cover plate <NUM> close to battery cell <NUM> is folded to make it bond to the surface of cover plate <NUM>, and the final wrapping state is obtained as shown in <FIG>.

It should be understood that in the embodiment of the present application, a side configured to bend of the insulating film <NUM> can be pre-scribed before the bending of the insulating film <NUM>, for example, to form a physical state such as a marking line or a weakened area. However, the insulating film <NUM> may not be subjected to any form of process before bending, but only bend according to the imaginary bending line during the bending process, and finally form a wrapping state.

It should also be understood that the relevant parts in each embodiment of the present application may be referred to each other, and for the sake of brevity, details are not described herein again.

An embodiment of the present application further provides a battery, which may include the battery cell <NUM> wrapped with the insulating film <NUM> in the above embodiments.

An embodiment of the present application further provides a power consumption device, which may include the battery in the above embodiments. Optionally, the power consumption device may be a vehicle, a ship or a spacecraft, etc., but this is not limited by the embodiment of the present application.

<FIG> shows a schematic flowchart of a method <NUM> for producing a battery cell according to an embodiment of the present application. As shown in <FIG>, the method <NUM> may include:.

<FIG> is a schematic block diagram of a device <NUM> for producing a battery cell according to an embodiment of the present application. As shown in <FIG>, the device <NUM> may include: a provision module <NUM> and a wrapping module <NUM>.

The provision module <NUM> is configured to provide the battery cell <NUM> and provide the insulating film <NUM>; the wrapping module <NUM> is configured to use the insulating film <NUM> to wrap the battery cell <NUM>.

Claim 1:
An insulating film, being configured to wrap a battery assembly, wherein the insulating film comprises a bottom coverage area (<NUM>), N side coverage areas (<NUM>-<NUM>) and N pairs of bonding areas (<NUM>-<NUM>), N is an integer greater than <NUM>;
the bottom coverage area (<NUM>) having N sides (<NUM>-<NUM>), and the N side coverage areas (<NUM>-<NUM>) being respectively connected to the bottom coverage area (<NUM>) at the N sides (<NUM>-<NUM>), and can bend toward the bottom coverage area (<NUM>) along the N sides (<NUM>-<NUM>) respectively;
each pair of the N pairs of bonding areas (<NUM>-<NUM>) being located between two adjacent side coverage areas of the N side coverage areas (<NUM>-<NUM>), and being connected to the two adjacent side coverage areas respectively; each pair of bonding areas is configured to make the bottom coverage area (<NUM>) and the N sides coverage areas (<NUM>-<NUM>) form a space wrapping the battery assembly by bonding surfaces on the same side of each pair of bonding areas when the N sides coverage areas (<NUM>-<NUM>) bend toward the bottom coverage area (<NUM>);
wherein a width of a first bonding area in each pair of bonding areas is greater than a width of a second bonding area, and after bonding, each pair of bonding areas can bend toward the side coverage area adjacent to the second bonding area, wherein the part that is not bonded with the second bonding area in the first bonding area is configured to bond to the side coverage area adjacent to the second bonding area.