CN220774531U - Protective film, battery monomer, battery and electric equipment - Google Patents
Protective film, battery monomer, battery and electric equipment Download PDFInfo
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- CN220774531U CN220774531U CN202420049487.1U CN202420049487U CN220774531U CN 220774531 U CN220774531 U CN 220774531U CN 202420049487 U CN202420049487 U CN 202420049487U CN 220774531 U CN220774531 U CN 220774531U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 154
- 239000000178 monomer Substances 0.000 title claims abstract description 19
- 238000005253 cladding Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims description 78
- 238000000576 coating method Methods 0.000 claims description 78
- 239000012790 adhesive layer Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 19
- 238000002347 injection Methods 0.000 description 17
- 239000007924 injection Substances 0.000 description 17
- 239000007788 liquid Substances 0.000 description 14
- 239000003792 electrolyte Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 12
- 238000013461 design Methods 0.000 description 11
- 238000009413 insulation Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application belongs to the field of new energy battery equipment, and particularly relates to a protective film, a battery monomer, a battery and electric equipment. The protection film is used for cladding the free casing of battery, the casing has four first sides and two second sides, the protection film includes circumference cladding region and edge cladding region, circumference cladding region is used for cladding at first side, two edge cladding regions are used for cladding respectively at two second sides, be equipped with the first crease in advance of extending along first direction between circumference cladding region and the edge cladding region, circumference cladding region is equipped with the second crease in advance of extending along the second direction, edge cladding region cuts has the parting joint of one-to-one second crease in advance, parting joint extends to first crease in advance, wherein first direction perpendicular to second direction. The technical scheme aims to solve the problems that in the related art, the internal space of the battery is wasted more and the utilization rate of the internal space of the battery is reduced due to the overlapping of the plurality of layers of protection films.
Description
Technical Field
The application belongs to the technical field of new energy battery equipment, and particularly relates to a protective film, a battery monomer, a battery and electric equipment.
Background
In the process of producing lithium batteries (hereinafter, lithium batteries are simply referred to as batteries), the components of a bare cell, a shell, a current collector, an electrolyte and the like are required to be assembled to produce a battery cell, and then a plurality of battery cells are assembled to form the battery.
In the process of assembling and producing the battery cell, when the bare cell, the current collector and the like are assembled to the shell, the shell is coated with the protective film in order to improve the safety performance of the battery cell, prolong the service life of the battery cell, prevent the battery cell from self-discharging and prevent the corrosion of the battery cell.
For cylindrical battery cells, the protective film is wound on the cylindrical surface of the shell, and then the protective film beyond the two ends of the shell can only be folded, so that the coating operation of the protective film is completed.
For the cuboid battery cell, the cuboid shell has clear edges, so the protective film needs to be folded when being folded and coated through edges. And because the protective film is continuous, when two adjacent edges corresponding to each vertex angle of the shell are folded, the protective film can have an overlapping area of multiple layers of protective films. On the side of the case where such a region is located, the overlapping of the multi-layered protective films results in an increase in the size of the battery cell in the direction perpendicular to the side. Thus, when a plurality of cuboid battery cells are assembled and molded into a large battery, the internal space of the battery is wasted more due to the overlapping area of the plurality of layers of protective films, so that the utilization rate of the internal space of the battery is reduced, and the energy density of the battery is not facilitated.
Disclosure of Invention
The utility model provides an aim at provides a protection film, battery monomer, battery and consumer, aims at solving among the correlation technique cuboid form battery monomer and is wasted more because of the region that the multilayer protection film that exists overlaps that the inner space that leads to the battery, has not only reduced the utilization ratio of the inner space of battery, is unfavorable for the problem of the energy density of battery moreover.
In order to achieve the above object, according to a first aspect of the present application, the following technical solution is adopted: the utility model provides a protection film for cladding battery monomer's casing, the casing has four first sides that connect gradually end to end and two second sides that are located first side both ends respectively, the protection film includes circumference cladding region and connects respectively in the edge cladding region of circumference cladding region both sides, circumference cladding region is used for cladding in first side, two edge cladding regions are used for cladding respectively in two second sides, be equipped with the first crease of extending along first direction between circumference cladding region and the edge cladding region, circumference cladding region is equipped with the second crease of extending along the second direction, the second is creased and is set up corresponding with the edge that meets between two adjacent first sides in advance, the edge cladding region cuts has the split joint of one-to-one second crease in advance, the split joint extends to first crease in advance, wherein first direction perpendicular to second direction.
The protective film is coated on the outer side surface of the battery monomer shell, namely, the protective film coats most of the area of the outer side surface of the shell or completely coats the outer side surface of the shell, so that the battery monomer is effectively protected, the safety performance of the battery monomer can be improved, the service life of the battery monomer can be prolonged, the battery monomer can be prevented from self-discharging, the corrosion of the battery monomer shell can be prevented, and the like. In the protective film provided by the embodiment design of the application, when the protective film is coated on the outer side surface of the cuboid-shaped shell, after the circumferential coating area of the protective film is wound and attached to the outer side of the shell along the first direction X, a cutting slit is cut on the edge coating area of the protective film. Wherein each apex angle of the cuboid-shaped housing corresponds to a dividing slit, and the dividing slit is opposite to and parallel to an edge of the housing extending in the second direction Y. Then, the respective portions of the edge covering region divided by the respective dividing slits are folded over and attached to the second side surface of the case by the dividing slits. Thus, when the case is coated with the protective film, the number of overlapping layers of the protective film can be significantly reduced by the protective film corresponding to each vertex angle position, and the dimension of the battery cell in the direction perpendicular to the second side surface (i.e., the dimension in the fifth direction Sz) can be reduced.
In some embodiments of the present application, the length of the protective film in the first direction is equal to the perimeter of the second side of the housing. So make the protection film be not windowing in the bottom surface of casing and set up, just can realize effective insulation protection through the protection film between the bottom surface of casing and the inside wall of battery box.
In some embodiments of the present application, the length of the protective film in the first direction is less than the perimeter of the second side of the housing.
In some embodiments of the present application, the side of the protective film facing the housing is provided with an adhesive layer. The adhesive layer enables the protection film not to easily generate the edge warping condition, and improves the qualification rate of the coating and the lamination of the protection film.
In some embodiments of the present application, the circumferential cladding region is provided with an avoidance hole, and the avoidance Kong Bikai second pre-crease is set. Avoidance holes are punched in advance on the protective film, so that the protective film is wound, coated and attached to the outer side of the shell along the first direction X rapidly, and coating efficiency is improved.
In some embodiments of the present application, the widths of the two edge-coated regions in the second direction are equal. So can be according to the length of casing and the width of protection film, plan on the protection film of tiling state and coil and laminate the lateral surface of casing along first direction X to effectively improve the work efficiency of cladding laminating protection film.
In some embodiments of the present application, the width of the edge-coated region in the second direction is less than one half the side length of the second side in the third direction.
In some embodiments of the present application, the width of the edge-coated region in the second direction is equal to one half of the side length of the second side in the third direction. So the protection film on the second side is not windowed and can realize effective insulation protection between each second side and the inner side wall surface of the battery box body.
According to the technical scheme adopted in the second aspect of the application, the method comprises the following steps: provided is a battery cell including:
the shell is provided with four first side surfaces which are connected end to end in sequence and two second side surfaces which are respectively positioned at two ends of the first side surfaces;
according to the protective film, the circumferential coating area of the protective film is used for coating the first side surface, the two edge coating areas of the protective film are respectively used for coating the two second side surfaces, the two edges of the circumferential coating area of the protective film in the first direction are arranged on one of the first side surfaces in the coating state of the protective film, the first pre-folds are opposite to the connecting edges between the first side surfaces and the second side surfaces, and the second pre-folds are opposite to the connecting edges between the two adjacent first side surfaces in a one-to-one correspondence manner.
The protective film is coated on the outer side surface of the shell, namely, the protective film coats most of the area of the outer side surface of the shell or completely coats the outer side surface of the shell, so that effective protection is realized on the battery cell, the safety performance of the battery cell can be improved, the service life of the battery cell can be prolonged, the battery cell can be prevented from self-discharging, the corrosion of the battery cell shell can be prevented, and the like. In the battery cell according to the embodiment of the present application, when the outer side surface of the rectangular parallelepiped case is coated with the protective film, the peripheral coating region of the protective film is wound around and attached to the outer side of the case in the first direction X, and then the edge coating region of the protective film is slit. Wherein each apex angle of the cuboid-shaped housing corresponds to a dividing slit, and the dividing slit is opposite to and parallel to an edge of the housing extending in the second direction Y. Then, the respective portions of the edge covering region divided by the respective dividing slits are folded over and attached to the second side surface of the case by the dividing slits. Thus, when the case is coated with the protective film, the number of overlapping layers of the protective film can be significantly reduced by the protective film corresponding to each vertex angle position, and the dimension of the battery cell in the direction perpendicular to the second side surface (i.e., the dimension in the fifth direction Sz) can be reduced. Therefore, when the cuboid-shaped battery monomer provided by the embodiment design of the application is assembled and formed into the large battery, the internal space of the battery can be effectively utilized obviously and optimally, the effective utilization rate of the internal space of the battery is improved, and the energy density of the battery is improved.
In some embodiments of the present application, one of the first sides is provided with a current collector, and an edge formed by the first side and the second side together with the current collector extends along the third direction. Therefore, the position of punching avoiding holes on the protective film can be determined according to the length, the width and the height of the shell, and the working efficiency of coating and attaching the protective film is improved.
In some embodiments of the present application, an edge-coated region corresponding to an edge of the second side extending in a fourth direction is attached to the second side, wherein the fourth direction is perpendicular to the third direction. Since the edge coating region corresponds to the second side surface along the fourth direction S y The edge of (a) is larger than the rest, so that the edge-coated region corresponds to the second side in the fourth direction S y Is folded and stuck on the edge part of the frameThe folding and attaching mode of the rest parts can improve the working efficiency of folding and attaching the edge coating area on the second side surface.
According to the technical scheme adopted by the third aspect of the application, the method comprises the following steps: there is provided a battery comprising a battery cell as described above.
According to the fourth aspect of the application, the following technical scheme is adopted: there is provided a powered device comprising a battery as described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an assembled structure of a battery cell according to an embodiment of the present application without a protective film;
fig. 2 is a schematic diagram of an exploded structure of a battery cell according to an embodiment of the present application without a protective film;
fig. 3 is a schematic structural view of a type of protective film used in the battery cell according to the embodiment of the present application in a flat state;
fig. 4 is a schematic structural view of a battery cell overmolded with the protective film shown in fig. 3;
fig. 5 is a schematic structural diagram of a second battery cell overmolded with the protective film shown in fig. 3;
fig. 6 is a schematic diagram III of a structure of a battery cell over-molded by using the protective film shown in fig. 3;
fig. 7 is a schematic structural view of a battery cell overmolded with the protective film shown in fig. 3;
fig. 8 is a schematic structural view of another type of protective film used in the battery cell according to the embodiment of the present application in a flat state;
fig. 9 is a schematic structural view of a battery cell overmolded with the protective film shown in fig. 8;
fig. 10 is a schematic diagram of a second structure of a battery cell overmolded with the protective film shown in fig. 8;
fig. 11 is a schematic structural view of a battery cell overmolded with the protective film shown in fig. 8;
fig. 12 is a schematic structural view of a battery cell overmolded with the protective film shown in fig. 8;
fig. 13 is a schematic structural view of a battery cell completely coated with a protective film;
fig. 14 is an exploded view of a battery according to an embodiment of the present application;
fig. 15 is a schematic structural diagram of an electric device according to an embodiment of the present application.
Wherein, each reference sign in the figure:
100. a battery cell;
10. a housing; 101. a housing body; 102. a cover; 11. an accommodation space; 12. a bare cell; 13. a current collector; 14. a pressure release mechanism; 15. a liquid injection hole; 16', a first side; 16. a second side; 17. an edge; 18. avoidance holes;
20. a protective film; 21. an edge cladding region; 22. dividing the slits; 23. a circumferential cladding region; 24. a first pre-crease; 25. a second pre-crease;
200. a battery; 210. a case body; 220. a cover body;
300. an electric device; 310. a frame; 320. a driving motor;
x, a first direction; y, second direction; s is S x A third direction; s is S y A fourth direction; s is S z A fifth direction;
L 1 the length of the protective film; l (L) 2 The width of the protective film; l (L) 3 The length of the long side of the second side surface; l (L) 4 The broadside length of the second side surface; l (L) 5 The width of the edge coating area.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Currently, the application of power batteries, particularly lithium batteries, is more widespread in view of the development of market situation (hereinafter, lithium batteries are collectively referred to as batteries). The 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, electric automobiles, and the like, and various fields such as police equipment, military equipment, aerospace, and the like. With the continuous expansion of the battery application field, the market demand thereof is also continuously expanding.
Generally, a battery includes a battery case, a battery cell, an electric element, and the like, wherein the battery case includes a case body and a cover body that are mutually covered to form an assembly space for accommodating the battery cell. In the process of assembling and producing the battery, firstly, each battery cell is placed in a box body, and is connected in a serial connection mode, a parallel connection mode or a series-parallel connection mode according to the rated voltage of the designed battery through an electric element, then a cover body is covered on the box body and is tightly connected on the box body, so that all the battery cells and the electric element are accommodated in an assembling space, and the assembling work of the battery is completed.
Before the battery is assembled, each battery cell is assembled and produced. As shown in fig. 1 to 2, the battery cell 100 includes a bare cell 12, a case 10, a current collector 13, a pressure release mechanism 14, a protective film 20, an electrolyte, and the like, the bare cell 12 is placed in the case 10, the current collector 13 is mounted and fixed on the case 10, and the case 10 is provided with a liquid injection hole 15. When the battery cell 100 is assembled and produced, the bare cell 12 is placed in the shell 10, the battery cell 100 is electrically connected with the current collector 13, the shell 10 is sealed, electrolyte is injected into the shell 10 through the electrolyte injection hole 15, the bare cell 12 is soaked by the electrolyte, and the electrolyte injection hole 15 is sealed and blocked, so that a semi-finished product of the battery cell 100 is formed. Finally, it is necessary to cover the outer side of the case 10 of the semi-finished product of the battery cell 100, in which the electrolyte is injected, with the protective film 20, to effectively protect the battery cell 100, thereby completing the assembly work of the battery cell 100.
In the related art, since the rectangular parallelepiped case is provided with a sharp corner, the protective film must be folded when the protective film is folded and covered by the edge. In addition, since the protective film is a continuous whole protective film, in the related art, the whole protective film is folded and overlapped corresponding to each vertex angle position of the rectangular parallelepiped battery cell, so that there is a case where the multilayer protective films are overlapped corresponding to the region positions of each vertex angle position. The overlapping of the multi-layer protective films causes the increase of the size of the battery cell in the direction perpendicular to the side surface where the multi-layer protective films are located, so when a plurality of cuboid-shaped battery cells are assembled and formed into a large-sized battery, the battery cell is wasted more in the internal space of the battery due to the overlapping of the multi-layer protective films, the utilization rate of the internal space of the battery is reduced, and the energy density of the battery is not facilitated.
Based on the above considerations, in order to solve the problem that in the related art, the cuboid-shaped battery cells are wasted more in the internal space of the battery due to overlapping of the existing multilayer protective films, the utilization rate of the internal space of the battery is reduced, and the energy density of the battery is not facilitated, therefore, the embodiment design of the application provides a protective film and uses the protective film to cover the battery cell shell so as to provide a battery cell capable of optimally solving the technical defects. And the assembled battery is assembled by using the assembled battery monomer, and the assembled battery is applied to the electric equipment to supply power to the electric load of the electric equipment. For the protection film that adopts turns over entirely, overlap the mode to corresponding to each apex angle position among the correlation technique and wrap up, the battery monomer of this application adopts the protection film that this application design provided to wrap up, when the protection film is accomplished in the cladding, the protection film corresponding to each apex angle position can obviously reduce the number of overlapping layers of protection film, has reduced the battery monomer in the ascending size of the side at perpendicular to multilayer protection film place. Therefore, when the cuboid-shaped battery monomer provided by the embodiment design of the application is assembled and formed into the large battery, the internal space of the battery can be effectively utilized obviously and optimally, the effective utilization rate of the internal space of the battery is improved, and the energy density of the battery is improved.
As shown in fig. 1 to 7, the battery cell 100 provided by the embodiment design of the present application includes a case 10 and a protective film 20, wherein the protective film 20 is also provided by the embodiment design of the present application. The outline shape of the case 10 is a rectangular parallelepiped shape, that is, the battery cell 100 is a rectangular parallelepiped shape (also commonly referred to as a prismatic battery cell). The protective film 20 is used for coating the casing 10 of the battery unit 100, the casing 10 has four first side surfaces 16 'connected end to end in sequence and two second side surfaces 16 respectively located at two ends of the first side surfaces 16', the protective film 20 includes a circumferential coating region 23 and edge coating regions 21 respectively connected to two sides of the circumferential coating region 23, the circumferential coating region 23 is used for coating the first side surfaces 16', the two edge coating regions 21 are respectively used for coating the two second side surfaces 16, a first pre-crease 24 extending along a first direction X is arranged between the circumferential coating region 23 and the edge coating regions 21, the circumferential coating region 23 is provided with a second pre-crease 25 extending along a second direction Y, the second pre-crease 25 corresponds to a joint edge between two adjacent first side surfaces 16', the edge coating region 21 is cut with a split joint 22 which corresponds to the second pre-crease 25 one by one in a flat state, and the split joint 22 extends to the first pre-crease 24, wherein the first direction X is perpendicular to the second direction Y. Specifically, the circumferential coating region 23 of the protective film 20 is wound around and attached to the circumferential outer side surrounded by the four first side surfaces 16', and both ends of the protective film 20 in the first direction X are disposed on the same side surface in opposition in the wound state of the protective film 20. The protective film 20 has edge coating regions 21 extending beyond the two second sides 16 of the case 10, respectively, on both sides of the protective film 20 in the second direction Y in the flat state. The two edge coating areas 21 are cut with the dividing slits 22, in the state that the protective film 20 is wound, the four dividing slits 22 on each edge coating area 21 are arranged in one-to-one correspondence with the four edges 17 of the case 10 extending parallel to the second direction Y, the edge coating areas 21 are folded along the edges of the corresponding second side surfaces 16 and attached to the second side surfaces 16 (namely, the edge coating areas 21 are folded along the first pre-folds 24), thereby coating the protective film 20 on a large part of the outer side surface of the case 10 (even the whole outer side surface of the case 10), and effectively protecting the battery cells 100 by using the protective film 20.
The "shape of the outline of the casing 10 is a cuboid" including, but not limited to, a cuboid shape which is absolutely defined, some cuboid-like shapes having outline shapes close to a cuboid shape are also suitable for the cuboid-like casing 10 of the present application, for example, cuboid-like shapes having rounded corners as the corners, cuboid-like shapes having a plurality of edges which are arc-shaped and arc-shaped edges having smaller curvature, and the like. In the following description, a description will be given by taking "the outline shape of the case 10 as a rectangular parallelepiped shape to be defined as an example.
The "first direction X" means, as shown in fig. 3 and 8, that the length extending direction of the protective film 20 is the first direction X when the protective film 20 is in a flat state.
The "second direction Y" means that, as shown in fig. 3 and 8, the width extending direction of the protective film 20 is the second direction Y when the protective film 20 is in a flat state.
The protection film 20 is coated on the outer side surface of the shell 10, i.e. the protection film 20 coats most of the outer side surface of the shell 10 or completely coats the outer side surface of the shell 10, so that the battery cell 100 is effectively protected, the safety performance of the battery cell can be improved, the service life of the battery cell can be prolonged, the self-discharge of the battery cell can be prevented, the corrosion of the battery cell shell can be prevented, and the like. In the battery cell 100 provided by the embodiment design of the present application, when the protective film 20 is coated on the outer side surface of the rectangular parallelepiped housing 10, the protective film 20 in a flat state is wound in the first direction X and attached to the outer side of the housing 10, and then the cutting slits 22 are cut on the edge coating regions 21 beyond the two second side surfaces 16 of the housing 10. Wherein each apex angle of the cuboid-shaped housing 10 corresponds to a dividing slit 22, and the dividing slits 22 are opposite to the edges 17 of the housing 10 extending in the second direction Y. Then, the respective portions of the edge covering region 21 divided by the respective dividing slits 22 are folded and attached to the second side 16 of the case 10 by the dividing slits 22. In this way, when the case 10 is coated with the protective film 20, the protective films 20 corresponding to the respective vertex angle positions can significantly reduce the number of overlapping layers of the protective film 20, reducing the size of the battery cell 100 in the direction perpendicular to the second side 16. In this way, when the cuboid-shaped battery cells 100 provided by the embodiments of the present application are assembled and formed into the larger battery 200, the internal space of the battery 200 can be effectively utilized, the effective utilization rate of the internal space of the battery 200 is improved, and the energy density of the battery 200 is improved.
In some embodiments of the present application, the direction of extension of the dividing slit 22 and the direction of extension of the edge 17 facing it are parallel to each other, i.e. the dividing slit 22 and the edge 17 are on the same straight line.
In general, the two outer side surfaces of the maximum area of the rectangular parallelepiped case 10 must be entirely covered with the protective film 20 because, when stacking a plurality of battery cells 100, adjacent two battery cells 100 are stacked with contact by the largest surface of the outer side. This provides a good insulating protection effect between the battery cells 100 through the protective film 20. Further, the outer side surface of the battery cell 100 is spaced apart from the inner side wall surface of the battery case of the battery 200 by the protective film 20, thereby forming a good insulation protection effect.
In some embodiments of the present application, as shown in fig. 1 and 2, a current collector 13 is disposed on one of the two second sides 16 of the case 10, that is, the case 10 having a rectangular parallelepiped shape has 6 sides in total, wherein the number of sides between the two second sides 16 is 4, and the current collector 13 is disposed on one of the 4 sides. In general, the side surface provided with the current collector 13 is further provided with a pressure release mechanism 14 and a liquid injection hole 15. As shown in fig. 3, the protective film 20 is provided with a dodging hole 18 for dodging the current collector 13. As shown in fig. 3, the protective film 20 is further provided with an escape hole 18 for escaping from the pressure release mechanism 14 and an escape hole 18 for escaping from the liquid injection hole 15. When the protective film material is wound out of the predetermined length of the case 10 for covering one battery cell 100 (i.e., the length L of the protective film 1 ) At this time, the protective film 20 is in a flat state, and the protective film 20 is punched with the required relief holes 18 by a punching process, so that not only can a plurality of relief holes 18 be punched at one time by a punching toolThe shape required by each avoiding hole 18 is obtained once through the shape of the blanking cutter, so that the shapes of the current collector 13, the pressure release mechanism 14 and the liquid injection hole 15 are matched, and the processing efficiency is high. Then, as shown in fig. 4 and 5, the protection of punching out the avoidance holes 18 coats the casing 10 of the battery cell 100, so that the current collector 13, the pressure release mechanism 14 and the liquid injection holes 15 are in one-to-one correspondence with the avoidance holes 18, and the protection film 20 is rapidly wound, coated and attached to the outer side of the casing 10 along the first direction X, thereby improving the coating efficiency.
Pressure relief mechanism 14 refers to an element or component that actuates to relieve internal pressure when the internal pressure or temperature of battery cell 100 reaches a predetermined threshold. Wherein, "actuating" refers to the pressure relief mechanism 14 acting such that the internal pressure and temperature of the battery cell 100 is relieved. The actions generated by pressure relief mechanism 14 may include, but are not limited to: at least a portion of pressure relief mechanism 14 breaks, tears, or melts, etc. Upon actuation of the pressure relief mechanism 14, the high temperature flue gas within the battery cell 100 may be vented outwardly from the pressure relief mechanism 14. The predetermined threshold may be adjusted according to design requirements. The predetermined threshold may depend on the material of one or more of the positive electrode tab, the negative electrode tab, the electrolyte, and the separator in the battery cell 100. The pressure relief mechanism 14 may employ elements or components such as those sensitive to pressure or temperature, i.e., when the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold, the pressure relief mechanism 14 is actuated, thereby forming a channel through which the internal pressure may be vented.
The filling hole 15 is a hole through which the electrolyte can be filled into the accommodation space 11 of the case 10 by using a filling instrument. In the battery cell 100, the case 10 includes a case body 101 and a case cover 102, and the case cover 102 is covered on the case body 101 to form a receiving space 11 for receiving the bare cell 12 and an electrolyte, which infiltrates the bare cell 12. In general, the liquid injection hole 15 is provided in the case cover 102, and after the electrolyte is injected into the accommodating space 11, the liquid injection hole 15 needs to be sealed and plugged to prevent the electrolyte from leaking.
In some embodiments of the present application, as shown in FIG. 1, the side provided with current collector 13 forms a rib with second side 16The edge 17 is the second side 16 along the third direction S x Is a side of (c). The sides of the 6 sides of the shell 10, on which the current collector 13, the pressure release mechanism 14 and the liquid injection hole 15 are arranged, are determined, so that the positions of punching avoiding holes 18 on the protective film 20 are determined according to the length, the width and the height of the shell 10, and the working efficiency of coating and attaching the protective film 20 is improved.
Wherein "third direction S x "means, as shown in fig. 1, when the battery cells 100 are applied to the assembled battery 200 and the battery 200 is assembled to the electric device 300 to be used normally, each battery cell 100 has the liquid injection hole 15 facing upward, that is, the side surface of the housing 10 having the liquid injection hole 15 is the top surface, and at this time, the width extending direction of the rectangular parallelepiped battery cell 100 is the third direction S x . The height extending direction of the rectangular parallelepiped battery cell 100 is the fourth direction S y The method comprises the steps of carrying out a first treatment on the surface of the The longitudinal extending direction of the rectangular parallelepiped battery cell 100 is the fifth direction S z . Third direction S x Fourth direction S y In the fifth direction S z The combination is formed into a space rectangular coordinate system. As shown in FIG. 1, the broadside length of the second side of the housing 10 is L 4 (i.e., the width of the battery cell 100 is L 4 ) The length of the long side of the second side of the housing 10 is L 3 (i.e., the height of the battery cell 100 is L 3 ). Referring to fig. 3 in combination, the length of the battery cell 100 is L 2 -2*L 5 。
In some embodiments of the present application, as shown in fig. 8-10, the length of the protective film 20 in the first direction X (i.e., the length L of the protective film 1 ) Equal to the perimeter of the second side 16 of the housing 10, wherein the perimeter of the second side 16 of the housing 10 is 2 (L) 3 +L 4 ) L is then 1 =2*（L 3 +L 4 ). As shown in fig. 9 and 10, when the protective film 20 is wound around and attached to the outside of the case 10 in the first direction X, both ends of the protective film 20 in the first direction X are grounded to each other on the side opposite to the side on which the current collector 13, the pressure release mechanism 14, and the injection hole 15 are provided (i.e., the bottom surface of the case 10). That is, the protective film 20 is opposite to 4 between the two second sides 16 of the housing 10The side surfaces are completely covered and bonded, namely, the protective film 20 is arranged on the bottom surface of the shell 10 without windowing. In this way, 4 sides between the two second sides 16 of the case 10 are completely covered and bonded by the protective film 20, effective insulation protection is achieved between the adjacent two battery cells 100 through the protective film 20 when the battery 200 is produced by stacking and assembling the plurality of battery cells 100, and since the protective film 20 is not windowed on the bottom surface of the case 10, effective insulation protection can be achieved between the bottom surface of the case 10 and the inner side wall of the battery case through the protective film 20, and effective insulation protection is further achieved between the bottom surface of the case 10 and the inner side wall surface of the battery case by laying an insulating layer.
In some embodiments of the present application, as shown in fig. 3-5, the length of the protective film 20 in the first direction X (i.e., the length L of the protective film 1 ) Less than the perimeter of the second side 16 of the housing 10, wherein the perimeter of the second side 16 of the housing 10 is 2 (L) 3 +L 4 ) L is then 1 ＜2*（L 3 +L 4 ). As shown in fig. 4 and 5, when the protective film 20 is wound around and attached to the outside of the case 10 in the first direction X, both ends of the protective film 20 in the first direction X are located at a distance from the side surface (i.e., the bottom surface of the case 10) opposite to the side surface on which the current collector 13, the pressure release mechanism 14, and the liquid injection hole 15 are provided, and when the battery 200 is produced by stacking and assembling a plurality of battery cells 100, effective insulation protection is achieved between two adjacent battery cells 100 by the protective film 20. On the bottom surface of the case 10, the protective film 20 is windowed on the bottom surface of the case 10, and effective insulation protection is achieved by laying an insulating layer between the bottom surface of the case 10 and the inner side wall surface of the battery case.
In some embodiments of the present application, as shown in fig. 3 and 8, the width of the two edge-coated regions 21 in the second direction Y (i.e., the width L of the edge-coated regions 5 ) Equal. Wherein "width L of two edge coating regions 5 Equal "including but not limited to the width L of the two edge-coated regions 5 Absolute perfect equality between them; when the width L of the two edge coating areas 5 The difference between them being within a predetermined deviation rangeWhen the inner part is enclosed, the width L of the two edge coating areas can be attributed to 5 Equal "in protection. Thus, the length of the casing 10 and the width L of the protective film can be determined 2 The outer side surface of the shell 10 is wound and attached along the first direction X on the protective film 20 in a flat state, so that the working efficiency of coating and attaching the protective film 20 is effectively improved.
In some embodiments of the present application, as shown in fig. 3-12, the width of the edge-coated region 21 in the second direction Y (i.e., the width L of the edge-coated region 5 ) Smaller than the second side 16 along the third direction S x One half of the side length of (c). Thus, when the edge coating region 21 is folded over and attached to the two second side surfaces 16 of the case 10 through the dividing slit 22, the edge coating region 21 does not completely coat the second side surfaces 16, that is, the protective film 20 on the second side surfaces 16 is windowed. In the case of producing the battery 200 by stacking and assembling the plurality of battery cells 100, effective insulation protection is achieved between each of the second side surfaces 16 and the inner side wall surface of the battery case by laying an insulating layer.
In some embodiments of the present application, as shown in fig. 13, the width of the edge-coated region 21 in the second direction Y (i.e., the width L of the edge-coated region 5 ) Equal to the second side 16 in the third direction S x One half of the side length of (c). Thus, when the edge coating region 21 is folded over and attached to the two second side surfaces 16 of the case 10 through the dividing slit 22, the edge coating region 21 completely coats the second side surfaces 16, that is, the protective film 20 on the second side surfaces 16 is not windowed. In the case of stacking and assembling the battery 200 using the plurality of battery cells 100, effective insulation protection can be achieved between each of the second side surfaces 16 and the inner side wall surface of the battery case by the protective film 20, and effective insulation protection can be further achieved by laying an insulating layer between each of the second side surfaces 16 and the inner side wall surface of the battery case.
In some embodiments of the present application, as shown in fig. 6, 7, 11 and 12, the second side 16 is aligned with the fourth direction S y The edge-coated region 21 corresponding to the edge of (a) is attached to the second side 16.When the edge coating region 21 is used to coat and attach the second side 16, the edge coating region 21 is first applied to the second side 16 along the fourth direction S y Is folded over and applied through the dividing slit 22 (i.e., in the fourth direction S corresponding to the second side 16 y The edge-covered region 21 of the edge of (a) is applied to the second side 16) and then the remainder of the edge-covered region 21 is folded over and applied. Due to the correspondence of the second side 16 along the fourth direction S y The edge coating area 21 of the edge of (a) is larger than the remaining area, so that it will correspond to the second side 16 in the fourth direction S y The edge coating region 21 of the edge is folded and attached, and the rest is folded and attached, so that the working efficiency of folding and attaching the edge coating region 21 on the second side surface 16 can be improved.
In some embodiments of the present application, the side of the protective film 20 facing the case 10 is provided with an adhesive layer (not shown). The protective film 20 can be stably attached to the outer side face of the shell 10 through the adhesive layer, the protective film 20 is not easy to be warped, and the qualification rate of the protective film 20 for coating and attaching is improved.
In the embodiment of the present application, the manner in which the outer side surface of the case 10 of the battery cell 100 is covered with the protective film 20 is: the battery cell 100 includes a case 10 and a protective film 20. The outline shape of the housing 10 is a rectangular parallelepiped. The protective film 20 is wound around and attached to the outside of the case 10 in the first direction X, both ends of the protective film 20 are disposed on the same side face opposite to each other, and both sides of the protective film 20 have edge coating regions 21 respectively beyond both second side faces 16 of the case 10 in the second direction Y. The two edge coating regions 21 are cut with a plurality of dividing slits 22 spaced apart from each other along the first direction X, four of the plurality of dividing slits 22 in each edge coating region being disposed in one-to-one correspondence with four edges 17 of the housing 10 extending parallel to the second direction Y, the edge coating regions 21 being folded over along the edges of their corresponding second side 16 and being attached to the second side 16. The top surface of the shell 10 is provided with a current collector 13, a pressure relief mechanism 14 and a liquid injection hole 15, and correspondingly, a protective film 20 is provided with an avoiding hole 18 for avoiding the current collector 13, the pressure relief mechanism 14 and the liquid injection hole 15. The protective film 20 is not windowed on the bottom surface of the case 10, and the protective film 20 is not windowed on both the second side surfaces 16.
According to another aspect of the present application, the design provides a battery 200, as shown in fig. 14. The battery 200 includes the battery cell 100 and a battery case, and the battery cell 100 is mounted in the battery case. As shown in fig. 14, the battery case includes a case body 210 and a cover 220, and the case body 210 and the cover 220 are covered with each other to form an assembly space for accommodating the battery cell 100. In the process of assembling the battery 200, each battery cell 100 is placed in the case body 210, and each battery cell 100 is connected in series, parallel or series-parallel according to the rated voltage of the designed battery 200 by the electric components, and then the cover 220 is covered on the case body 210 and the cover 220 is fastened to the case body 210, so that all the battery cells 100 and the electric components are accommodated in the assembly space, thereby completing the assembly work of the battery 200. The assembled battery 200 is applied to the power consumption device 300 to supply power to the load of the power consumption device 300.
In accordance with yet another aspect of the present application, a powered device 300 is provided. The electric equipment comprises the battery 200, and the battery 200 supplies power to an electric load of the electric equipment 300.
The prepared battery 200 can be applied to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like to provide electric energy. Among them, the electric toy may include, but is not limited to, fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like. Spacecraft may include, but are not limited to, airplanes, rockets, space shuttles, spacecraft, and the like.
In the embodiment of the present application, the electric device 300 is an electric automobile, and as shown in fig. 15, the battery 200 is mounted on a frame 310 of the electric automobile. The battery 200 provided by the embodiment design of the application supplies power for the driving motor 320 of the electric automobile, so that the electric automobile can normally run.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. The protective film is used for coating a shell of a battery monomer, the shell is provided with four first side surfaces which are connected end to end in sequence and two second side surfaces which are respectively positioned at two ends of the first side surfaces, the protective film comprises a circumferential coating area and edge coating areas which are respectively connected to two sides of the circumferential coating area, the circumferential coating area is used for coating the first side surfaces, and the two edge coating areas are respectively used for coating the two second side surfaces, and the protective film is characterized in that a first pre-crease which extends along a first direction is arranged between the circumferential coating area and the edge coating area, a second pre-crease which extends along a second direction is arranged in the circumferential coating area, the second pre-crease is correspondingly arranged with a connecting edge between two adjacent first side surfaces, and the edge coating area is cut with a dividing seam which corresponds to the second pre-crease one, and the dividing seam extends to the first pre-crease, wherein the first direction is perpendicular to the second direction;
the widths of the two edge coating areas along the second direction are equal;
and, the width of the edge coating area along the second direction is less than or equal to one half of the side length of the second side surface along a third direction, wherein the third direction is the width direction of the second side surface.
2. The protective film according to claim 1, wherein:
the length of the protective film in the first direction is equal to the perimeter of the second side surface.
3. The protective film according to claim 1, wherein:
the length of the protective film in the first direction is smaller than the perimeter of the second side surface.
4. The protective film according to claim 1, wherein:
an adhesive layer is arranged on one side of the protective film facing the shell.
5. The protective film according to claim 1, wherein:
the circumferential cladding region is provided with an avoidance hole, and the avoidance Kong Bikai is arranged on the second pre-crease.
6. A battery cell, comprising:
the shell is provided with four first side surfaces which are connected end to end in sequence and two second side surfaces which are respectively positioned at two ends of the first side surfaces;
the protective film according to any one of claims 1 to 5, wherein the peripheral coating region of the protective film is used for coating the first side surface, the two edge coating regions of the protective film are respectively used for coating the two second side surfaces, in the coating state of the protective film, the two edges of the peripheral coating region of the protective film in the first direction are arranged on one of the first side surfaces, the first pre-folds are opposite to the connecting edges between the first side surfaces and the second side surfaces, and the second pre-folds are opposite to the connecting edges between the adjacent two first side surfaces in a one-to-one correspondence.
7. The battery cell of claim 6, wherein:
one of the first side surfaces is provided with a current collector, and an edge formed by the first side surface and the second side surface provided with the current collector extends along a third direction.
8. The battery cell of claim 7, wherein:
the edge coating region corresponding to an edge of the second side extending in a fourth direction is attached to the second side, wherein the fourth direction is perpendicular to the third direction.
9. A battery, characterized in that: comprising a battery cell according to any one of claims 6-8.
10. An electrical consumer, characterized in that: comprising a battery according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420049487.1U CN220774531U (en) | 2024-01-09 | 2024-01-09 | Protective film, battery monomer, battery and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420049487.1U CN220774531U (en) | 2024-01-09 | 2024-01-09 | Protective film, battery monomer, battery and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220774531U true CN220774531U (en) | 2024-04-12 |
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ID=90620815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420049487.1U Active CN220774531U (en) | 2024-01-09 | 2024-01-09 | Protective film, battery monomer, battery and electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220774531U (en) |
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2024
- 2024-01-09 CN CN202420049487.1U patent/CN220774531U/en active Active
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