Battery monomer and electric equipment

Abstract

The utility model relates to a battery monomer and electric equipment. Comprising a shell; the battery cell is positioned in the shell; the insulating film is located in the shell, the insulating film is provided with a containing cavity, the battery cell is contained in the containing cavity, and a first opening is formed in one end, in the first direction, of the insulating film; wherein the insulating film includes a flexible portion; a first elastic member disposed at the first opening of the insulating film; the first elastic piece is connected with the flexible part, and the first opening is contracted by the first elastic piece. According to the technical scheme, the effect of protecting the battery cell by the insulating film can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer and an electric device. BACKGROUND

[0002] Lithium batteries are a kind of batteries using non-aqueous electrolyte solution with lithium metal or lithium alloy as positive / negative electrode material. Lithium batteries have the advantages of high energy density, high working voltage, long cycle life, fast charging capability, low self-discharge rate, no memory effect, strong adaptability to high and low temperature, etc. However, under abnormal conditions, lithium batteries may produce short circuit, explosion and other phenomena due to overheating, etc., and there is a certain safety risk.

[0003] Therefore, the safety problem of lithium batteries has always been one of the first considerations of manufacturers. One of the measures to improve the safety of lithium batteries is to set an insulating film or protective film between the battery cell and the shell.

[0004] However, the current insulating film generally needs to be wrapped around the battery cell through a hot melt process, which has a relatively high process cost. CONTENT OF THE INVENTION

[0005] Therefore, the present application provides a battery monomer and an electric device to solve at least one problem in the background art.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] In a first aspect, the present application provides a battery monomer, comprising:

[0008] a shell;

[0009] a battery cell located in the shell;

[0010] an insulating film located in the shell, the insulating film having a receiving cavity, the battery cell being received in the receiving cavity, the insulating film having a first opening at one end along a first direction; wherein the insulating film comprises a flexible portion;

[0011] a first elastic member arranged at the first opening of the insulating film; the first elastic member and the flexible portion are connected, and the first elastic member contracts the first opening.

[0012] Optionally, the insulating film further comprises a hard portion located at the peripheral side of the battery cell, the hard portion and the flexible portion being connected to form the receiving cavity; the thickness of the hard portion is 0.05mm-0.5mm.

[0013] Optionally, the flexible part is provided with a first hollow area, the first hollow area is provided with the hard part, the hard part covers the first hollow area, and the hard part and the flexible part are connected by adhesive or the hard part and the flexible part are connected to form a hot melt printing.

[0014] Optionally, the flexible part includes a first part, a second part, a third part and a fourth part, the first part and the third part are respectively arranged on both sides of the battery cell along a second direction, and the second part and the fourth part are respectively arranged on both sides of the battery cell along a third direction; at least one of the first part, the second part, the third part and the fourth part is provided with the first hollow area, wherein the second direction and the first direction are perpendicular to each other, and the third direction and the second direction are perpendicular to each other.

[0015] Optionally, the first part, the second part, the third part and the fourth part are sequentially connected and integrally formed.

[0016] Optionally, the flexible part further includes a fifth part, the fifth part and the first opening are oppositely arranged along a first direction; the fifth part is integrally formed with the first part and the third part at both ends along a second direction; and the fifth part is integrally formed with the second part and the fourth part at both ends along a third direction.

[0017] Optionally, the bottom support sheet is further provided, the bottom support sheet and the first opening are oppositely arranged along a first direction; four corner regions and one middle region of the bottom support sheet are connected with the fifth part; and the thickness of the bottom support sheet is 0.1mm-1mm.

[0018] Optionally, the second elastic member is further provided, the insulating film has a second opening, the first opening and the second opening are oppositely arranged along a first direction; the second elastic member is arranged at the second opening of the insulating film, the second elastic member is connected with the flexible part, and the second elastic member shrinks the second opening.

[0019] Optionally, the first opening is shrunk to an area less than or equal to 90% of the area of the first opening.

[0020] In a second aspect, the embodiments of the present application provide a power consumption device including any one of the above-mentioned battery monomers.

[0021] The battery monomer and the electric equipment provided by the embodiment of the application comprise: a shell; an electric core located in the shell; an insulating film located in the shell, the insulating film has a containing cavity, the electric core is contained in the containing cavity, and the insulating film has a first opening at one end in a first direction; wherein the insulating film comprises a flexible part; a first elastic piece is arranged at the first opening of the insulating film; the first elastic piece is connected with the flexible part, and the first elastic piece shrinks the first opening. It can be seen that the battery monomer and the electric equipment of the embodiment of the application are first manufactured into an insulating film, so that the insulating film has a containing cavity, and a first elastic piece is arranged at the first opening of the containing cavity; the flexible part of the insulating film is shrunk by the first elastic piece in a natural state, so that the first opening is shrunk; in this way, the first elastic piece is stretched, so that the electric core is smoothly loaded into the cavity of the containing cavity from the first opening, the tab of the electric core is stretched out from the first opening, the first elastic piece is restored to the natural state, the insulating film firmly wraps the electric core, and the assembly of the insulating film and the electric core is fast, the position of the electric core in the insulating film is more stable, and the protection effect of the electric core is improved. Therefore, the battery monomer and the electric equipment of the embodiment of the application can improve the protection effect of the insulating film on the electric core.

[0022] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0024] Figure 1 A schematic view of the insulating film in the battery monomer provided by the embodiment one of the application;

[0025] Figure 2 A schematic view of the insulating film in the battery monomer provided by the embodiment one of the application;

[0026] Figure 3 A schematic view of the flexible part in the insulating film in the battery monomer provided by the embodiment one of the application;

[0027] Figure 4 A schematic view of the insulating film in the battery monomer provided by the embodiment two of the application.

[0028] Explanation of reference signs:

[0029] 10, insulating film; 11, first opening; 12, flexible part; 121, first hollowed-out area; 122, first part; 123, second part; 124, third part; 125, fourth part; 126, fifth part; 13, rigid part; 14, bottom support sheet; 141, middle area; 142, corner area; 15, second opening; 16, cover film; 161, clamping groove; 162, electrically connected via; 21, first elastic member; 22, second elastic member; 30, buckle. DETAILED DESCRIPTION

[0030] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following will be described in detail by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as the technical and scientific terms in the technical field to which the present application belongs.

[0031] In the description of the present application, the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of the simplified description of the present application, and do not indicate that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, i.e. cannot be understood as limiting the present application.

[0032] In the present application, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; except for explicit specific limitations.

[0033] In the present application, unless otherwise explicitly defined, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be understood broadly. For example, "connection" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly defined, the first feature is "on", "over", "above" and "upper" the second feature, "under", "below", "under" or "under" the second feature. The first feature and the second feature are in direct contact, or the first feature and the second feature are indirectly contacted by an intermediate medium. Moreover, the first feature is "over", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "under", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0035] For a thorough understanding of the present application, detailed steps and detailed structures will be presented in the following description in order to illustrate the technical solutions of the present application. The preferred embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other implementation manners.

[0036] Embodiment one

[0037] For the technical problems in the related art, the present application provides a battery monomer. Referring to Figure 1 and Figure 2 , the battery monomer includes a shell, an electric core located in the shell, an insulating film 10, a positive pole lug of the electric core and a positive pole column arranged on the shell are connected, a negative pole lug of the electric core and a negative pole column arranged on the shell are connected; wherein, in order to ensure the insulation of the electric core and the shell and facilitate the assembly of the electric core and the insulating film 10, the insulating film 10 has a receiving cavity, the electric core is received in the receiving cavity, and the insulating film 10 has a first opening 11 at one end along a first direction; The first elastic member 21 is arranged at the first opening 11 of the insulating film 10, the first elastic member 21 is connected with the flexible part 12 of the insulating film 10, and the first elastic member 21 contracts the first opening 11.

[0038] It can be understood that the shape of the battery monomer includes square, cylindrical and soft package, etc., and the present application mainly takes the square battery monomer, i.e. the battery monomer with square shell as an example for introduction. It can be understood that the technical solutions of the present application can also be used for other shapes of battery monomers.

[0039] It can be understood that in the present application, the first direction can be the direction of the electric core leading the lug, referring to Figure 1 .

[0040] It can be understood that in the present application, the insulating film 10 is a three-dimensional structure, having a receiving cavity and a first opening communicating with the receiving cavity.

[0041] It can be understood that at least part of the flexible part 12 of the insulating film 10 located at the first opening 11 is connected with the first elastic member 21, so that the first elastic member 21 contracts the first opening 11 by contracting the flexible part 12.

[0042] The battery cell of the embodiment of the present application is first manufactured with the insulating film 10, so that the insulating film 10 has a receiving cavity and a first opening, and the first elastic member 21 is arranged at the first opening 11 of the receiving cavity. When the first elastic member 21 is in a natural state, the flexible part 12 of the insulating film 10 is contracted, so that the first opening 11 is contracted. In this way, the first elastic member 21 is expanded, so that the battery cell is smoothly loaded into the receiving cavity from the first opening 11, and the tab of the battery cell extends from the first opening 11. When the first elastic member 21 returns to the natural state, the insulating film 10 tightly wraps the battery cell, so that the insulating film 10 and the battery cell are quickly assembled, the position of the battery cell in the insulating film 10 is more stable, and the effect of protecting the battery cell is improved.

[0043] It should be noted that the shape of the first elastic member 21 can be annular or strip-shaped, and the shape of the flexible part of the insulating film 10 located at the first opening 11 can meet the installation requirements of the first elastic member 21.

[0044] It should be further noted that the manufacturing material of the first elastic member 21 can be an elastic material, such as PET (Polyethylene terephthalate) or rubber.

[0045] The difference between the flexible part 12 and the first elastic member 21 is that the flexible part 12 is easy to deform under stress, but not easy to return to the original shape after the external force is removed, while the first elastic member 21 has a large deformation under stress and can return after the force is removed. Therefore, the first elastic member 21 can maintain the contracted state of the first opening 11.

[0046] In some other embodiments of the present application, the first opening 11 is contracted to an area less than or equal to 90% of the area of the first opening 11, which can effectively position the battery cell in the insulating film 10.

[0047] It can be understood that the first opening 11 is contracted under the action of the first elastic member 21, and the opening area after contraction is less than or equal to 90% of the opening area of the first opening 11 in the initial state. The initial state of the first opening 11 is the state without the first elastic member 21.

[0048] It should be noted that in order to avoid excessively contracting the first opening 11 to squeeze the edges of the battery cell and affect the performance of the battery cell, the first opening 11 is contracted to an area greater than or equal to 80% of the area of the first opening 11.

[0049] Specifically, the first opening 11 is constricted to an area equal to 90% of the area of the first opening 11, or 89% of the area of the first opening 11, or 88% of the area of the first opening 11, or 87% of the area of the first opening 11, or 86% of the area of the first opening 11, or 85% of the area of the first opening 11.

[0050] In some embodiments of the present application, referring to Figure 1 The insulating film 10 further comprises a hard portion 13 located at the circumferential side of the battery cell, the hard portion 13 and the flexible portion 12 are connected to form a receiving cavity; the thickness of the hard portion 13 is 0.05mm-0.5mm.

[0051] It can be understood that the circumferential side of the battery cell refers to one side of the battery cell along at least one direction perpendicular to the first direction.

[0052] It can be understood that the difference between the flexible portion 12 and the hard portion 13 can be the material itself. In some cases, the same material can also be used to form the flexible portion 12 and the hard portion 13 by adjusting the thickness.

[0053] The hard portion 13 is less likely to deform when stressed compared to the flexible portion 12. By arranging the hard portion 13, which is less likely to deform, at the circumferential side of the battery cell, that is, at least part of the circumferential wall of the receiving cavity is the hard portion 13, the three-dimensional state of the insulating film 10 can be better maintained.

[0054] If the thickness of the hard portion 13 is too thick, it will occupy more space inside the shell, thereby affecting the energy density of the battery. If the thickness of the hard portion 13 is too thin, it will affect the effect of maintaining the three-dimensional state of the insulating film 10. Therefore, the thickness of the hard portion 13 is designed to be 0.05mm-0.5mm. Specifically, the thickness of the hard portion 13 can be 0.1mm, 0.2mm, 0.3mm or 0.4mm. The setting of the thickness only adjusts the overall performance of the hard portion 13, such as the overall strength, impact performance, fatigue performance, etc., without changing the performance of the material itself, such as the surface hardness and other performances.

[0055] It should be noted that the material of the hard portion 13 can be PC (Polycarbonate), PP (Polypropylene) and the like.

[0056] There are various specific structures for the flexible portion 12 and the hard portion 13 to connect to form a receiving cavity, referring to Figure 1One of them is that, for leading out the positive and negative tabs on one side of the battery cell along the first direction, the rigid part 13 and the flexible part 12 are both arranged around the first direction, the flexible part 12 and the rigid part 13 are arranged in sequence along the first direction, one end of the flexible part 12 forms the first opening, and the other end of the flexible part 12 and the rigid part 13 are connected into one to form the cavity of the accommodating cavity.

[0057] Referring to Figure 4 Another is that, for leading out the positive and negative tabs on both sides of the battery cell along the first direction, the flexible part 12 is divided into two flexible segments, both of which and the rigid part 13 are arranged around the first direction, the rigid part 13 is located between the two flexible segments, and the two flexible segments are connected into one through the rigid part 13 to form the cavity of the accommodating cavity, and the ends of the two flexible segments away from the rigid part 13 form the first opening and the second opening, respectively.

[0058] Still another is that at least part of the flexible part 12 is arranged around the first direction to form the accommodating cavity, and the rigid part 13 is connected with the cavity wall of the flexible part 12.

[0059] Of course, there are also, for example, part of the cavity wall forming the accommodating cavity is the flexible part 12 and the other part is the rigid part 13, which will not be exemplified one by one.

[0060] Specifically, taking at least part of the flexible part 12 arranged around the first direction to form the accommodating cavity as an example, further explanation is made, in order to save the manufacturing material of the flexible part 12, referring to Figure 2 and Figure 3 The flexible part 12 is provided with a first hollow area 121, the first hollow area 121 is provided with a rigid part 13, the rigid part 13 covers the first hollow area 121, and the rigid part 13 and the flexible part 12 are connected by adhesive, or the rigid part 13 and the flexible part 12 form a hot melt print at the connection.

[0061] It can be understood that the rigid part 13 and the flexible part 12 are connected through an adhesive layer, or the rigid part 13 and the flexible part 12 are hot melt connected to form a hot melt print at the connection.

[0062] It can be understood that the first hollow area 121 can be integrally formed when the flexible part 12 is formed, or it can be processed after the flexible part 12 is formed, for example, by a punching process.

[0063] Since the accommodating cavity is formed by the flexible part 12 surrounding the battery cell, the thickness error of the battery cell during processing can also be applied, and the applicability is better. Moreover, since the flexible part 12 and the hard part 13 are arranged in combination, the expansion force generated by the battery cell during charging and discharging can be buffered, thereby effectively reducing the expansion range of the battery cell. By arranging the first hollow area 121 in the flexible part 12 to avoid the hard part 13, the manufacturing cost of the flexible part 12 is saved.

[0064] It should be noted that the hard part 13 and the flexible part 12 can also be connected by a tape.

[0065] Further, the shell is a cuboid, and therefore the flexible part 12 includes a first portion 122, a second portion 123, a third portion 124, and a fourth portion 125. The first portion 122 and the third portion 124 are respectively arranged on both sides of the battery cell along a second direction, and the second portion 123 and the fourth portion 125 are respectively arranged on both sides of the battery cell along a third direction. At least one of the first portion 122, the second portion 123, the third portion 124, and the fourth portion 125 is provided with a first hollow area 121. The second direction and the first direction are perpendicular to each other, and the third direction and the second direction are perpendicular to each other (see Figure 2 and Figure 3 ).

[0066] Specifically in this embodiment, the first portion 122, the second portion 123, the third portion 124, and the fourth portion 125 are all provided with the first hollow area 121, and the hard part 13 is arranged at each first hollow area 121. In this way, the four hard parts 13 correspond to the four side walls of the battery cell respectively, thereby effectively buffering the expansion force generated by the battery cell during charging and discharging, improving the situation that the battery cell expands and deforms due to the mutual extrusion of the battery cell and the shell after the battery cell expands, and thereby effectively improving the safety of the battery cell during use.

[0067] It should be noted that the four side walls of the battery cell can be provided with the hard part 13 on only one side, or can be provided with the hard part 13 on all four side walls. In this way, the battery cell can be effectively protected, and more use scenarios can be adapted.

[0068] Further, the battery cell has a positive electrode lug and a negative electrode lug led out along the first direction. Correspondingly, the first wall of the shell faces the end surface of the battery cell from which the electrode lugs are led out, and the first wall of the shell is provided with a positive electrode column and a negative electrode column. In this way, the flexible part 12 can also include a fifth portion 126, and the fifth portion 126 and the first opening 11 are arranged opposite to each other along the first direction. The two ends of the fifth portion 126 along the second direction are integrally formed with the first portion 122 and the third portion 124 respectively. The two ends of the fifth portion 126 along the third direction are integrally formed with the second portion 123 and the fourth portion 125 respectively.

[0069] It can be understood that the four sides of the fifth part 126 are connected with the first part 122, the second part 123, the third part 124 and the fourth part 125 respectively. And from the manufacturing process, the first part 122, the second part 123, the third part 124, the fourth part 125 and the fifth part 126 can be integrally formed.

[0070] In this embodiment, the flexible part 12 is an integrally formed structure, which is fast to manufacture, is also beneficial to use when there is a thickness error in the process of processing the battery cell, and is also beneficial to buffer the expansion force generated by the battery cell in the charging and discharging process.

[0071] In some other embodiments of the present application, the battery cell leads out the positive and negative tabs in the first direction, and correspondingly, the first wall of the shell is opposite to the end face of the battery cell leading out the tabs, the first wall of the shell is provided with the positive and negative poles, and thus, considering the influence of the R angle at the bottom of the shell on the battery cell, the battery monomer further comprises a bottom support sheet 14, the bottom support sheet 14 and the first opening 11 are oppositely arranged in the first direction; the bottom support sheet 14 is connected with the insulating film 10, and the battery cell is lifted by setting the bottom support sheet 14, so that the edge of the bottom of the battery cell and the inner R angle of the bottom of the shell are avoided.

[0072] Specifically, one middle region 141 of the bottom support sheet 14 is connected with the fifth part 126 of the insulating film 10. Here, the connection mode can be connected through an adhesive layer, or connected through an adhesive tape, or connected through a hot melting mode.

[0073] Further, not only the middle region 141 of the bottom support sheet 14 is connected with the fifth part 126 of the insulating film 10, but also the four corner regions 142 of the bottom support sheet 14 are connected with the fifth part 126 of the insulating film 10, so that the size of the bottom surface of the insulating film (oppositely arranged with the first opening in the first direction) remains unchanged, and the assembly of the insulating film and the battery cell is better positioned.

[0074] Further, when the thickness of the bottom support sheet is too thin, it is not conducive to lifting the battery cell to avoid the inner R angle of the bottom of the shell, and when the thickness of the bottom support sheet is too thick, it is not conducive to the energy density of the battery, therefore, the thickness of the bottom support sheet 14 is 0.1mm-1mm.

[0075] Specifically, the thickness of the bottom support sheet 14 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm or 0.9mm.

[0076] It should be noted that, like other parts of the insulating film 10, the fifth part 126 of the flexible part 12 can also be placed with the bottom support sheet 14 by opening a hollow area, and connected by adhesive or hot melting.

[0077] The embodiments of the present application also provide a kind of electric equipment, comprising the battery monomer described above.

[0078] Embodiment Two

[0079] The basic structure of a battery cell in this embodiment is the same as that in Embodiment One, except that, referring to Figure 4 , the positive tab is led out from one side of the cell along the first direction, and the negative tab is led out from the other side of the cell along the first direction. Correspondingly, the shell has a first wall and a second wall arranged opposite to each other along the first direction. The first wall of the shell is opposite to the end face of the cell from which the positive tab is led out, and the first wall of the shell is provided with a positive post. The second wall of the shell is opposite to the end face of the cell from which the negative tab is led out, and the second wall of the shell is provided with a negative post. In this way, the battery cell further comprises a second elastic member 22, and the insulating film 10 has a second opening 15. The first opening 11 and the second opening 15 are arranged opposite to each other along the first direction. The second elastic member 22 is arranged at the second opening 15 of the insulating film 10, and the second elastic member 22 is connected with the flexible part 12, and the second elastic member 22 contracts the second opening 15.

[0080] In this way, the cell can be loaded into the accommodating cavity from the first opening 11 by stretching the first elastic member 21, and the positive tab and the negative tab of the cell can be respectively extended from the first opening 11 and the second opening 15. Alternatively, the cell can be loaded into the accommodating cavity from the second opening 15 by stretching the second elastic member 22, and the positive tab and the negative tab of the cell can be respectively extended from the first opening 11 and the second opening 15. The assembly of the cell and the insulating film is quick.

[0081] In other embodiments of the present application, the flexible part 12 comprises a first part 122, a second part 123, a third part 124 and a fourth part 125. The first part 122, the second part 123, the third part 124 and the fourth part 125 are arranged to form an accommodating cavity, and the first part 122, the second part 123, the third part 124 and the fourth part 125 are connected in sequence and integrally formed.

[0082] Further, referring to Figure 4 To ensure that the cell and the first wall and the second wall of the shell are insulated, the insulating film 10 is provided with a cover film 16 at the first opening 11 and the second opening 15. One end of the cover film 16 is foldably and integrally connected with the first part 122 of the insulating film 10, and the other end of the cover film 16 is connected with the third part 124 of the insulating film 10 by snap buckle 30 and card slot 161. Alternatively, one end of the cover film 16 is foldably and integrally connected with the second part 123 of the insulating film 10, and the other end of the cover film 16 is connected with the fourth part 125 of the insulating film 10 by snap buckle 30 and card slot 161.

[0083] And in order to ensure that the positive and negative tabs of the battery cell respectively extend from the first and second openings, the cover film 16 is provided with an electrically connected via hole 162 for the tabs to pass through.

[0084] It should be noted that the cover film 16 can be made of the same material and thickness as the bottom support 14 in the first embodiment, which is beneficial to the protection of the battery cell.

[0085] It should be noted that the buckle 30 can be integrally formed with the cover film 16, or can be separately manufactured and then installed.

[0086] Specifically, the buckle 30 includes a neck connected to the cover film 16 and a head connected to the neck. Correspondingly, the clamping groove 161 includes a neck groove and a head groove connected to the neck groove, the width of the neck groove is slightly larger than the neck, the width of the head groove is slightly larger than the head, but the width of the neck groove is smaller than the head. In this way, when the clamping groove 161 and the buckle 30 are connected, the head is tilted and clamped into the head groove, and then flattened. Since the width of the neck groove is smaller than the head, the buckle 30 is not easy to be pulled out of the clamping groove 161 after clamping.

[0087] It should be noted that the structure of the buckle 30 and the clamping groove 161 can be various, as long as the buckle 30 and the clamping groove 161 can be clamped.

[0088] It can be understood that, Figure 4 The placement direction of the insulating film 10 and the like is only for convenience, and does not represent the placement direction of the working state of the battery cell.

[0089] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations of the technical solutions of the present application. Various modifications and changes can be made to the above embodiments without departing from the scope of the present application. Similarly, any combination of the technical features of the above embodiments can be made to form another embodiment of the present application which can not be explicitly described. Therefore, the above embodiments only express several embodiments of the present application, and do not limit the protection scope of the patent of the present application.

Claims

1. A battery cell, characterized by, The application relates to a battery, which comprises the following parts: a shell; an electric core located in the shell; an insulating film (10) located in the shell, the insulating film (10) having a containing cavity, the electric core being contained in the containing cavity, the insulating film (10) having a first opening (11) at one end along a first direction; wherein the insulating film (10) comprises a flexible part (12); a first elastic member (21) arranged at the first opening (11) of the insulating film (10); the first elastic member (21) and the flexible part (12) are connected, and the first elastic member (21) contracts the first opening (11).

2. The battery cell of claim 1, wherein, The insulating film (10) further comprises a hard part (13) located at the circumferential side of the electric core, the hard part (13) and the flexible part (12) being connected to form the containing cavity; the thickness of the hard part (13) is 0.05-0.5 mm.

3. The battery cell of claim 2, wherein, The flexible part (12) is provided with a first hollow area (121), the first hollow area (121) is provided with the hard part (13), the hard part (13) covers the first hollow area (121), and the hard part (13) and the flexible part (12) are connected by gluing or the hard part (13) and the flexible part (12) are connected to form a hot melt printing.

4. The battery cell of claim 3, wherein, The flexible part (12) comprises a first part (122), a second part (123), a third part (124) and a fourth part (125), the first part (122) and the third part (124) are arranged at two sides of the electric core along a second direction respectively, the second part (123) and the fourth part (125) are arranged at two sides of the electric core along a third direction respectively; at least one of the first part (122), the second part (123), the third part (124) and the fourth part (125) is provided with the first hollow area (121), wherein the second direction and the first direction are perpendicular to each other, and the third direction and the second direction are perpendicular to each other.

5. The battery cell of claim 4, wherein, The first part (122), the second part (123), the third part (124) and the fourth part (125) are sequentially connected and integrally formed.

6. The battery cell of claim 4, wherein, The flexible part (12) further comprises a fifth part (126), the fifth part (126) and the first opening (11) are oppositely arranged along the first direction; the fifth part (126) is integrally formed with the first part (122) and the third part (124) at two ends along the second direction respectively; the fifth part (126) is integrally formed with the second part (123) and the fourth part (125) at two ends along the third direction respectively.

7. The battery cell of claim 6, wherein, The application further comprises a bottom supporting sheet (14), the bottom supporting sheet (14) and the first opening (11) are oppositely arranged along the first direction; four corner regions (142) and one middle region (141) of the bottom supporting sheet (14) are connected with the fifth part (126); the thickness of the bottom supporting sheet (14) is 0.1-1 mm.

8. The battery cell of any one of claims 1 to 5, wherein, Also included is a second elastic member (22), the insulating film (10) having a second opening (15), the first opening (11) and the second opening (15) being oppositely arranged along a first direction; the second elastic member (22) being arranged at the second opening (15) of the insulating film (10), the second elastic member (22) being connected to the flexible portion (12), the second elastic member (22) contracting the second opening (15).

9. The battery cell of claim 1, wherein, The first opening (11) contracts to an area less than or equal to 90% of the area of the first opening (11).

10. An electric device, characterized by A battery cell as claimed in any one of claims 1-9.

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