Battery monomer, battery and electric equipment

Abstract

The utility model relates to a battery monomer, a battery and electric equipment. The battery cell includes: a case having an opening located on one side of the case in a first direction and a first side surface as an outer surface of the case on one side of the case in a second direction perpendicular to the first direction; the top cover assembly comprises a top cover covering the opening and a pole arranged on the top cover; the insulating film is provided with a first covering area covering the first side face and a first folding area connected with the first covering area, and the first folding area is bent to the top cover relative to the first covering area; wherein the edge of one side, deviating from the first coverage area, of the first edge folding area comprises a first extending section and a first avoiding section, and the distance from the first extending section to the first coverage area is greater than the distance from the first avoiding section to the first coverage area, so that a first avoiding gap for avoiding the pole is formed at the first avoiding section.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and an electrical device. Background Art

[0002] At present, the outer shell of the battery cell is generally made of aluminum shell or stainless steel shell. In order to avoid short circuit, an insulating film needs to be attached to the outer surface of the battery cell. In order to improve the overall insulation performance of the battery, the insulating film will extend to the top cover of the battery cell, that is, the insulating film is folded onto the top cover to form a folded edge. However, a pole needs to be set on the top cover, and the size of the pole accounts for a large proportion in the width direction of the top cover, resulting in a smaller folded edge width of the insulating film on the top cover, which in turn results in a smaller contact area between the folded edge of the insulating film and the top cover, which is easy to peel off or warp from the surface of the top cover. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cell, battery and electrical equipment that improve the above defects in order to address the problem that in the prior art, the size of the pole on the top cover accounts for a large proportion in the width direction of the top cover, which makes the folded edge width of the insulating film on the top cover small, resulting in a small contact area between the folded edge of the insulating film and the top cover, and is easy to peel off or warp from the surface of the top cover.

[0004] A battery cell, comprising:

[0005] A shell having an opening and a first side surface, wherein the opening is located on one side of the shell in a first direction, and the first side surface serves as an outer surface of the shell on one side in a second direction perpendicular to the first direction;

[0006] A top cover assembly comprises a top cover arranged at the opening and a pole arranged on the top cover; and

[0007] An insulating film having a first covering area covering the first side surface, and a first folding area connected to the first covering area, wherein the first folding area is bent onto the top cover relative to the first covering area;

[0008] Among them, the edge of the first folded area on one side away from the first covering area includes a first extension section and a first avoidance section, and the distance from the first extension section to the first covering area is greater than the distance from the first avoidance section to the first covering area, so as to form a first avoidance gap at the first avoidance section for avoiding the pole.

[0009] In one embodiment, the difference between the distance from the first extension section to the first covering area and the distance from the first avoidance section to the first covering area is greater than or equal to 1 mm.

[0010] In one embodiment, the distance from the first extension section to the first covering area is greater than or equal to 4 mm.

[0011] In one embodiment, the top cover assembly further includes an insulating member, wherein the insulating member is disposed between the pole and the top cover, and the first avoidance section of the first folded edge area covers at least a portion of the insulating member.

[0012] In one of the embodiments, the top cover assembly further includes an explosion-proof valve disposed on the top cover;

[0013] The edge of the first folding area on one side away from the first covering area also includes a second avoidance section, and the distance from the first extension section to the first covering area is greater than the distance from the second avoidance section to the first covering area, so as to form a second avoidance gap at the second avoidance section for avoiding the explosion-proof valve.

[0014] In one embodiment, the first extension section is configured as a plurality of sections arranged at intervals along a third direction perpendicular to the first direction and the second direction, and the first avoidance gap and the second avoidance gap are both located between two adjacent sections of the first extension section.

[0015] In one embodiment, two first side surfaces are provided, and the two first side surfaces serve as outer surfaces of the housing on two opposite sides in the second direction respectively;

[0016] The insulating film includes two first covering areas and two first folding areas connected to the two first covering areas in a one-to-one correspondence, and the two first folding areas are respectively bent onto the top cover relative to the first covering areas connected to them respectively; the first extension sections of the two first folding areas are spaced a preset distance apart.

[0017] In one embodiment, the shell further has two second side surfaces, and the two second side surfaces serve as outer surfaces of the shell on opposite sides in a third direction, and the third direction is perpendicular to both the first direction and the second direction;

[0018] The insulating film also has two second covering areas correspondingly covering the two second side surfaces and two second folding areas correspondingly connected to the two second covering areas, and each second folding area is bent onto the top cover relative to the second covering area connected to it.

[0019] In one of the embodiments, the shell further has a bottom surface, and the bottom surface serves as an outer surface of the shell on a side facing away from the opening in the first direction;

[0020] The insulating film further comprises a third covering area covering the bottom surface, one of the first folding areas, the third covering area, another of the first covering areas and another of the first folding areas are sequentially connected; each of the second covering areas comprises two first sub-covering areas respectively connected to two of the first covering areas, and the two first sub-covering areas at least partially overlap and cover a corresponding second side surface;

[0021] Each of the second folding areas includes two first sub-folding areas respectively connected to two of the first sub-covering areas.

[0022] In one embodiment, one of the first covering area, one of the two second covering areas and another first covering area are connected in sequence, the other of the two second covering areas includes two second sub-covering areas, the two second sub-covering areas are respectively connected to the two first covering areas, and at least partially overlap and cover a corresponding second side surface;

[0023] One of the second folding areas includes two first sub-folding areas respectively connected to two second sub-covering areas.

[0024] A battery comprises the battery cell as described in any one of the above embodiments.

[0025] An electrical device comprises the battery as described in any of the above embodiments.

[0026] In the battery cell, battery and electrical equipment, the first covering area of ​​the insulating film is rolled onto the first side surface of the shell, and then the first folding area of ​​the insulating film is rolled onto the top cover, so that the first folding area covers the side edge of the top cover close to the first side surface. Since the side edge of the first folding area away from the first covering area includes a first extension section and a first avoidance section, the distance from the first extension section to the first covering area is greater than the distance from the first avoidance section to the first covering area, so that the side edge of the first folding area away from the first covering area forms a first avoidance gap at the first avoidance section. The first avoidance gap is used to avoid the pole on the top cover, on the one hand, the width of the first folding area at the first avoidance section along the second direction is narrower, thereby avoiding the interference between the first folding area of ​​the insulating film and the pole; on the other hand, it ensures that the width of the first folding area at the first extension section along the second direction is wider, increasing the area of ​​the first folding area of ​​the insulating film, that is, increasing the contact area between the insulating film and the top cover, so that the first folding area of ​​the insulating film and the top cover are more firmly attached, greatly reducing the risk of warping or even falling off of the first folding area of ​​the insulating film. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is the developed view of the insulating film of the battery cell in an embodiment of the present utility model;

[0028] Figure 2 It is the state diagram before using the Figure 1 shown insulating film to wrap the housing and the top cover;

[0029] Figure 3 It is the state diagram before using the Figure 1 shown insulating film to wrap the housing and the top cover;

[0030] Figure 4 It is the developed view of the insulating film of the battery cell in another embodiment of the present utility model;

[0031] Figure 5 It is the state diagram before using the Figure 4 shown insulating film to wrap the housing and the top cover;

[0032] Figure 6 It is the state diagram before using the Figure 4 shown insulating film to wrap the housing and the top cover. Detailed implementation manners

[0033] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In the present utility model, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0039] Please refer to Figures 1 to 3As shown in the figure, an embodiment of the present utility model provides a battery cell, which includes a housing 10, a top cover assembly 20 and an insulating film 30. The housing 10 has an opening (not shown in the figure) and a first side surface 11. The opening is located on one side of the housing 10 in the first direction X1, and the first side surface 11 serves as the outer surface of one side of the housing 10 in the second direction X2. The first direction X1 is perpendicular to the second direction X2. The top cover assembly 20 includes a top cover 21 and a terminal post 22. The top cover 21 covers the opening of the housing 10, and the terminal post 22 is disposed on the top cover 21. The insulating film 30 has a first covering area 31 and a first folding edge area 32. The first covering area 31 of the insulating film 30 is used to cover the first side surface 11 of the housing 10, and the first folding edge area 32 of the insulating film 30 is connected to the first covering area 31. The first folding edge area 32 of the insulating film 30 is bent relative to the first covering area 31 onto the top cover 21 and covers the top cover 21. One side edge of the first folding edge area 32 facing away from the first covering area 31 includes a first extension section 321 and a first avoidance section 322. The distance from the first extension section 321 to the first covering area 31 is greater than the distance from the first avoidance section 322 to the first covering area 31, so as to form a first avoidance notch A1 for avoiding the terminal post 22 at the first avoidance section 322.

[0040] In this way, the first covering area 31 of the insulating film 30 is rolled onto the first side surface 11 of the housing 10, and then the first folding edge area 32 of the insulating film 30 is rolled onto the top cover 21, so that the first folding edge area 32 covers one side edge of the top cover 21 close to the first side surface 11. Since one side edge of the first folding edge area 32 facing away from the first covering area 31 includes a first extension section 321 and a first avoidance section 322, and the distance from the first extension section 321 to the first covering area 31 is greater than the distance from the first avoidance section 322 to the first covering area 31, a first avoidance notch A1 is formed at the first avoidance section 322 on one side edge of the first folding edge area 32 facing away from the first covering area 31. The first avoidance notch A1 is used to avoid the terminal post 22 on the top cover 21. On the one hand, it makes the width of the first folding edge area 32 of the insulating film 30 in the second direction X2 narrower at the first avoidance section 322, thus avoiding interference between the first folding edge area 32 of the insulating film 30 and the terminal post 22; on the other hand, it ensures that the width of the first folding edge area 32 of the insulating film 30 in the second direction X2 is wider at the first extension section 321, increasing the area of the first folding edge area 32 of the insulating film 30, that is, increasing the contact area between the insulating film 30 and the top cover 21, making the fitting of the first folding edge area 32 of the insulating film 30 and the top cover 21 more firm, and greatly reducing the risk of warping or even falling off of the first folding edge area 32 of the insulating film 30.

[0041] It should be noted that the insulating film 30 has a flattened unfolded state and a wrapped state wrapped around the housing 10 and the top cover 21. Figure 1The structural schematic diagram of the insulating film 30 in the unfolded state is shown. The insulating film 30 is separated between its respective regions by the crease line B. The crease line B can be formed by bending when the insulating film 30 is wrapped around the housing 10 and the top cover 21. Of course, in other embodiments, the crease line B can also be pre-formed on the insulating film 30 before film wrapping, so as to facilitate wrapping the insulating film 30 around the housing 10 and the top cover 21, which is conducive to improving the film wrapping quality.

[0042] Optionally, the difference between the distance from the first extension segment 321 to the first covering area 31 and the distance from the first avoidance segment 322 to the first covering area 31 is greater than or equal to 1 mm. On the one hand, it ensures that the width of the first folding edge area 32 along the second direction X2 at the first avoidance segment 322 is narrow enough; on the other hand, it ensures that the width of the first folding edge area 32 along the second direction X2 at the first extension segment 321 is wide enough. For example, the difference between the distance from the first extension segment 321 to the first covering area 31 and the distance from the first avoidance segment 322 to the first covering area 31 is equal to 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0043] Optionally, the distance from the first extension segment 321 to the first covering area 31 is greater than or equal to 4 mm, so as to ensure that the width of the first folding edge area 32 along the second direction X2 at the first extension segment 321 is wide enough, and further make the area of the first folding edge area 32 of the insulating film 30 large enough, further reducing the risk of warping or even falling off of the first folding edge area 32 of the insulating film 30. For example, the distance from the first extension segment 321 to the first covering area 31 is equal to 4 mm, 4.5 mm, 5 mm, 5.5 mm, etc.

[0044] Specifically in the embodiment, the top cover assembly 20 further includes an insulating member 24, which is disposed between the pole post 22 and the top cover 21 and is used for insulating the pole post 22 and the top cover 21, that is, to prevent the pole post 22 and the top cover 21 from being electrically conducted. At least a part of the insulating member 24 is covered at the first avoidance segment 322 of the first folding edge area 32. That is to say, the first folding edge area 32 extends to the insulating member 24 at the first avoidance segment 322, thereby avoiding the risk of poor insulation at the part of the top cover 21 where the edge of the insulating member 24 is not covered by the insulating film 30. It can be understood that the insulating member 24 can be upper plastic.

[0045] Specifically in the embodiment, the number of poles 22 is two, and the two poles 22 are arranged on the top cover 21 at intervals along a third direction X3 perpendicular to both the first direction X1 and the second direction X2. In order to avoid the two poles 22, the edge of the first folding area 32 on one side away from the first covering area 31 includes two first avoidance sections 322 corresponding to the two poles 22, and both ends of each first avoidance section 322 are first extension sections 321, so that two first avoidance gaps A1 are respectively formed at the two first avoidance sections 322. The two first avoidance gaps A1 avoid the two poles 22 respectively, that is, the two poles 22 are respectively located at the two first avoidance gaps A1 of the first folding area 32.

[0046] It is understandable that the battery cell also includes a battery cell (not shown) disposed in the housing 10 , and the positive and negative tabs of the battery cell are electrically connected to the two poles 22 respectively, so that the two poles 22 are used to input or output electrical energy.

[0047] Specifically in the embodiment, the top cover assembly 20 further includes an explosion-proof valve 23 disposed on the top cover 21, and the explosion-proof valve 23 is arranged spaced apart from the two poles 22 along the third direction X3. The edge of the first folding area 32 on one side away from the first covering area 31 further includes a second avoidance section 323. The distance from the first extension section 321 to the first covering area 31 is greater than the distance from the second avoidance section 323 to the first covering area 31, so as to form a second avoidance gap A2 for avoiding the explosion-proof valve 23 at the second avoidance section 323. In this way, on the one hand, the width of the first folding area 32 along the second direction X2 at the second avoidance section 323 is narrower, thereby avoiding interference between the first folding area 32 of the insulating film 30 and the explosion-proof valve 23; on the other hand, the width of the first folding area 32 along the second direction X2 at the first extension section 321 is wider, which increases the area of ​​the first folding area 32 of the insulating film 30, that is, increases the contact area between the insulating film 30 and the top cover 21, and makes the first folding area 32 of the insulating film 30 fit more firmly with the top cover 21, greatly reducing the risk of the first folding area 32 of the insulating film 30 warping or even falling off.

[0048] Furthermore, the first extension section 321 is configured to be a plurality of sections spaced apart along the third direction X3, and the first avoidance gap A1 and the second avoidance gap A2 are both located between two adjacent first extension sections 321, so that the positions of the first avoidance gap A1 and the second avoidance gap A2 respectively match the pole 22 and the explosion-proof valve 23, so that the first avoidance gap A1 avoids the pole 22, and the second avoidance gap A2 avoids the explosion-proof valve 23, ensuring that the width of each first extension section 321 of the first folding edge area 32 along the second direction X2 is wide enough.

[0049] Specific to Figure 1In the illustrated embodiment, the first extension section 321 includes four segments. For the convenience of description, the four segments of the first extension section 321 are respectively named as the first extension section 321a, the first extension section 321b, the first extension section 321c, and the first extension section 321d. The first extension section 321a, the first extension section 321b, the first extension section 321c, and the first extension section 321d are arranged at intervals along the third direction X3 in sequence. The first avoidance section 322 includes two segments. One segment of the first avoidance section 322 is located between the first extension section 321a and the first extension section 321b, thereby forming a first avoidance notch A1 for avoiding one of the pole columns 22 between the first extension section 321a and the first extension section 321b. The other segment of the first avoidance section 322 is located between the first extension section 321c and the first extension section 321d, thereby forming a first avoidance notch A1 for avoiding the other pole column 22 between the first extension section 321c and the first extension section 321d. The second avoidance section 323 is located between the first extension section 321b and the first extension section 321c, thereby forming a second avoidance notch A2 for avoiding the explosion-proof valve 23 between the first extension section 321b and the first extension section 321c.

[0050] In the embodiment of the present application, two first side surfaces 11 on the housing 10 are provided, and the two first side surfaces 11 are respectively used as the outer surfaces on the opposite sides of the housing 10 in the second direction X2. The insulating film 30 includes two first covering regions 31 and two first folding edge regions 32 connected to the two first covering regions 31 in one-to-one correspondence. The two first folding edge regions 32 are respectively bent relative to the first covering regions 31 connected thereto onto the top cover 21. A preset distance is provided between the first extension sections 321 of the two first folding edge regions 32.

[0051] In this way, the two first covering regions 31 of the insulating film 30 respectively cover the two first side surfaces 11 of the housing 10, and then the two first folding edge regions 32 respectively connected to the two first covering regions 31 are bent towards each other onto the top cover 21, so that the two first folding edge regions 32 respectively cover the two side edges of the top cover 21 in the second direction X2. The above-mentioned pole column 22 is located between the first avoidance notches A1 of the two first folding edge regions 32, that is, the first avoidance notches A1 on the two first folding edge regions 32 are used to avoid the pole column 22, so that the first extension sections 321 of the two first folding edge regions 32 can extend towards the middle of the top cover 21 as much as possible, ensuring that the areas of the two first folding edge regions 32 are large enough, that is, increasing the contact area between the two first folding edge regions 32 of the insulating film 30 and the top cover 21, making the fitting between the two first folding edge regions 32 of the insulating film 30 and the top cover 21 more firm, and greatly reducing the risk of warping or even falling off of the two first folding edge regions 32 of the insulating film 30.

[0052] Further, the housing 10 also has two second side surfaces 12, and the two second side surfaces 12 serve as the outer surfaces on the opposite sides of the housing 10 in the third direction X3. The insulating film 30 also has two second covering regions 33 and two second folding regions 35 connected to the two second covering regions 33 in one-to-one correspondence. The two second covering regions 33 cover the two second side surfaces 12 of the housing 10 in one-to-one correspondence, and the two second folding regions 35 are bent relative to the second covering regions 33 to which they are respectively connected onto the top cover 21, so that the two second folding regions 35 respectively cover the two side edges of the top cover 21 in the third direction X3. That is to say, the two side edges of the top cover 21 in the second direction X2 are respectively covered by the two first folding regions 32, and the two side edges of the top cover 21 in the third direction X3 are respectively covered by the two second folding regions 35, so that the four circumferential edges of the top cover 21 are all covered by the insulating film 30, avoiding the risk of poor insulation due to the exposure of the edges of the top cover 21.

[0053] It should be noted that the four circumferential edges of the top cover 21 are respectively covered by the two first folding regions 32 and the two second folding regions 35, but the middle part of the top cover 21 between the two first folding regions 32 and between the two second folding regions 35 is exposed. In order to avoid the risk of poor insulation due to the exposure of the middle part of the top cover 21, in this embodiment, after the insulating film 30 is wrapped, an insulating sheet (not shown in the figure) is attached to the top cover 21. The insulating sheet has avoidance holes for avoiding the two pole columns 22 and the explosion-proof valve 23, so as to cover the top cover 21 with the insulating sheet to avoid the exposure of the middle part of the top cover 21.

[0054] Please continue to refer to Figures 1 to 3As shown, in some embodiments, the insulating film 30 uses a U-shaped wrapping method to wrap the shell 10 and the top cover 21. Specifically, the shell 10 also has a bottom surface 13, which serves as the outer surface of the shell 10 on the first direction X1 and away from the opening. The insulating film 30 also has a third covering area 34 covering the bottom surface 13, wherein one first folding area 32, one first covering area 31, the third covering area 34, another first covering area 31 and another first folding area 32 are connected in sequence. Each second covering area 33 includes two first sub-covering areas 331 respectively connected to the two first covering areas 31, and the two first sub-covering areas 331 at least partially overlap and cover the corresponding second side surface 12, that is, the two second side surfaces 12 of the shell 10 are completely wrapped by the two first sub-covering areas 331. Each second folding area 35 includes two first sub-folding areas 351 respectively connected to the two first sub-covering areas 331, and each first sub-folding area 351 is bent onto the top cover 21 relative to the first sub-covering area 331 connected to it, so that the two side edges of the top cover 21 in the third direction X3 are covered by the two first sub-folding areas 351, that is, the surrounding edge areas of the top cover 21 are covered by one of the first folding areas 32, two of the first sub-folding areas 351, another first folding area 32 and the other two first sub-folding areas 351 in sequence.

[0055] It can be understood that the first folded edge area 32 and the second folded edge area 35 covering the corner position of the top cover 21 are in a multi-layer stacked state. Since the area of ​​the two first folded edge areas 32 is large enough, the first folded edge area 32 can fit more firmly on the top cover 21, which is beneficial to reduce the risk of the diaphragm 30 located at the corner of the top cover 21 to warp up.

[0056] It can be understood that in this embodiment, one of the first folding areas 32, one of the first covering areas 31, the third covering area 34, another first covering area 31 and another first folding area 32 of the insulating film 30 are wrapped on the shell 10 and the top cover 21 to form a "U" shape, so it is called a U-shaped packaging method.

[0057] It should be noted that the insulating film 30 is not limited to wrapping the housing 10 and the top cover 21 in a U-shaped wrapping manner. In other embodiments, the insulating film 30 may also wrap the housing 10 and the top cover 21 in an annular wrapping manner. Figures 4 to 6As shown, specifically, one of the first covering areas 31, one of the two second covering areas 33 and the other first covering area 31 are connected in sequence, and the other of the two second covering areas 33 includes two second sub-covering areas 332. The two second sub-covering areas 332 are respectively connected to the two first covering areas 31, and the two second sub-covering areas 332 at least partially overlap and cover the corresponding second side surface 12. That is, one of the second side surfaces 12 of the housing 10 is completely covered by a complete second covering area 33 of the insulating film 30, and the other second side surface 12 of the housing 10 is completely covered by another second covering area 33 of the insulating film 30 consisting of the two second sub-covering areas 332.

[0058] It can be understood that one of the second sub-covering areas 332 of the insulating film 30, one of the first covering areas 31, one of the second covering areas 33, another of the first covering areas 31 and another of the second sub-covering areas 332 are covered on the shell 10 to form a ring, which is therefore called an annular envelope method.

[0059] It should be noted that, in the present embodiment, one of the two second covering areas 33 of the insulating film 30 is complete, and the other is composed of two second sub-covering areas 332. One of the two second folding areas 35 of the insulating film 30 is complete and connected to the complete second covering area 33; the other of the two second folding areas 35 of the insulating film 30 is composed of two first sub-folding areas 351, which are respectively connected to the two second sub-covering areas 332, and the two first sub-folding areas 351 are respectively bent onto the top cover 21 relative to the second sub-covering areas 332 connected to each other, and together cover the edge of one side of the top cover 21 in the third direction X3.

[0060] Furthermore, the shell 10 also has a bottom surface 13, which is an outer surface of the shell 10 on the first direction X1 and away from the opening. The insulating film 30 also includes five bottom folding areas 37, which are respectively connected to one of the second sub-covering areas 332, one of the first covering areas 31, one of the second covering areas 33, another of the first covering areas 31 and another of the second sub-covering areas 332, and the five bottom folding areas 37 are all bent onto the bottom surface 13 of the shell 10, so that the bottom surface 13 of the shell 10 is wrapped together by the five bottom folding areas 37.

[0061] It should be noted that the bottom surface 13 of the housing 10 can be completely wrapped by the five bottom hem regions 37. Of course, the five bottom hem regions 37 can also be used to wrap the edges around the bottom surface 13 of the housing 10, and then an insulating sheet is attached to the bottom surface 13 of the housing 10, so as to achieve complete wrapping of the bottom surface 13 of the housing 10 and avoid the risk of poor insulation due to partial exposure of the bottom surface 13.

[0062] Based on the above battery cell, the present utility model further provides a battery, which refers to a single physical module including one or more battery cells to provide a certain voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. Specifically, a battery generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells. Specifically, in the battery, the battery cells can be one or multiple. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in a series-parallel combination. The series-parallel combination means that there are both series and parallel connections among the multiple battery cells. It can be that multiple battery cells are first connected in series, in parallel or in a series-parallel combination to form a battery module, and then multiple battery modules are connected in series, in parallel or in a series-parallel combination to form a whole and are accommodated in the box body. It can also be that all the battery cells are directly connected in series, in parallel or in a series-parallel combination together, and then the whole formed by all the battery cells is accommodated in the box body, and no special limitation is made here.

[0063] Based on the above battery, an electrical device is further provided in an embodiment of the present application. The electrical device includes the battery as described in any one of the above embodiments, and the electrical device uses the battery as a power source. Specifically, the electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator and a planer, etc. No special limitation is made to the above electrical device in the embodiments of the present application.

[0064] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0065] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell (10) having an opening and a first side surface (11), wherein the opening is located on one side of the shell (10) in a first direction (X1), and the first side surface (11) serves as an outer surface of one side of the shell (10) in a second direction (X2) perpendicular to the first direction (X1); A top cover assembly (20) comprises a top cover (21) covering the opening and a pole (22) arranged on the top cover (21); and An insulating film (30) having a first covering area (31) covering the first side surface (11), and a first folding area (32) connected to the first covering area (31), wherein the first folding area (32) is bent relative to the first covering area (31) onto the top cover (21); The first folded edge area (32) on one side away from the first covering area (31) comprises a first extension section (321) and a first avoidance section (322), and the distance from the first extension section (321) to the first covering area (31) is greater than the distance from the first avoidance section (322) to the first covering area (31), so as to form a first avoidance gap (A1) for avoiding the pole (22) at the first avoidance section (322).

2. The battery cell according to claim 1, characterized in that: The difference between the distance from the first extension section (321) to the first covering area (31) and the distance from the first avoidance section (322) to the first covering area (31) is greater than or equal to 1 mm.

3. The battery cell according to claim 1, characterized in that: The distance from the first extension section (321) to the first covering area (31) is greater than or equal to 4 mm.

4. The battery cell according to claim 1, characterized in that: The top cover assembly (20) further comprises an insulating member (24), wherein the insulating member (24) is arranged between the pole (22) and the top cover (21), and the first avoidance section (322) of the first folded edge area (32) covers at least a portion of the insulating member (24).

5. The battery cell according to claim 1, characterized in that: The top cover assembly (20) further comprises an explosion-proof valve (23) arranged on the top cover (21); The side edge of the first folding area (32) facing away from the first covering area (31) also includes a second avoidance section (323), and the distance from the first extension section (321) to the first covering area (31) is greater than the distance from the second avoidance section (323) to the first covering area (31), so as to form a second avoidance gap (A2) for avoiding the explosion-proof valve (23) at the second avoidance section (323).

6. The battery cell according to claim 5, characterized in that: The first extension section (321) is configured as a plurality of sections arranged at intervals along a third direction (X3) perpendicular to the first direction (X1) and the second direction (X2), and the first avoidance gap (A1) and the second avoidance gap (A2) are both located between two adjacent sections of the first extension section (321).

7. The battery cell according to any one of claims 1 to 6, characterized in that: The first side surfaces (11) are provided in two numbers, and the two first side surfaces (11) respectively serve as outer surfaces of two opposite sides of the shell (10) in the second direction (X2); The insulating film (30) comprises two first covering areas (31) and two first folding areas (32) connected to the two first covering areas (31) in a one-to-one correspondence; the two first folding areas (32) are respectively bent onto the top cover (21) relative to the first covering areas (31) connected to them; and the first extension sections (321) of the two first folding areas (32) are spaced a preset distance apart.

8. The battery cell according to claim 7, characterized in that: The shell (10) further comprises two second side surfaces (12), the two second side surfaces (12) serving as outer surfaces of the shell (10) on two opposite sides in a third direction (X3), the third direction (X3) being perpendicular to both the first direction (X1) and the second direction (X2); The insulating film (30) also has two second covering areas (33) that cover the two second side surfaces (12) one by one and two second folding areas (35) that are connected to the two second covering areas (33) one by one, and each of the second folding areas (35) is bent onto the top cover (21) relative to the second covering area (33) to which it is connected.

9. The battery cell according to claim 8, characterized in that: The housing (10) further comprises a bottom surface (13), wherein the bottom surface (13) serves as an outer surface of the housing (10) on a side in the first direction (X1) and facing away from the opening; The insulating film (30) further comprises a third covering area (34) covering the bottom surface (13); one of the first folding areas (32), one of the first covering areas (31), the third covering area (34), another of the first covering areas (31) and another of the first folding areas (32) are connected in sequence; each of the second covering areas (33) comprises two first sub-covering areas (331) respectively connected to the two first covering areas (31); the two first sub-covering areas (331) at least partially overlap and cover a corresponding second side surface (12); Each of the second folding areas (35) comprises two first sub-folding areas (351) respectively connected to two of the first sub-covering areas (331).

10. The battery cell according to claim 8, characterized in that: One of the first covering areas (31), one of the two second covering areas (33) and the other first covering area (31) are connected in sequence, the other of the two second covering areas (33) comprises two second sub-covering areas (332), the two second sub-covering areas (332) are respectively connected to the two first covering areas (31), and at least partially overlap and cover a corresponding second side surface (12); One of the second folding areas (35) includes two first sub-folding areas (351) respectively connected to two second sub-covering areas (332).

11. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 10.

12. An electrical equipment, characterized in that: Comprising the battery of claim 11.

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