CN117977130B - Battery Cells and Battery Packs - Google Patents

Battery Cells and Battery Packs Download PDF

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Publication number
CN117977130B
CN117977130B CN202410372540.6A CN202410372540A CN117977130B CN 117977130 B CN117977130 B CN 117977130B CN 202410372540 A CN202410372540 A CN 202410372540A CN 117977130 B CN117977130 B CN 117977130B
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shell
windows
window
length
battery cell
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CN117977130A (en
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孙超
李金成
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/572Means for preventing undesired use or discharge
    • H01M50/584Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/116Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204Racks, modules or packs for multiple batteries or multiple cells
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本发明涉及电池技术领域,公开了一种电芯及电池包,电芯包括:壳体;绝缘膜,包覆在所述壳体的外侧;所述绝缘膜开设有多个开窗,所述开窗对应所述壳体的侧面设置,所述壳体的侧面的长度为L,沿所述壳体的侧面的长度方向,多个所述开窗占据区域的长度为a,满足0.4≤a/L≤0.8。本发明通过对绝缘膜开设开窗,在粘接电芯时提高电芯壳体与电池包之间的粘接强度,提高电池包的寿命与安全性;通过对多个开窗占据区域长度的控制,保证在提高粘接强度的同时不影响电芯的绝缘效果。

The present invention relates to the field of battery technology, and discloses a battery cell and a battery pack, wherein the battery cell comprises: a shell; an insulating film, which is coated on the outside of the shell; the insulating film is provided with a plurality of windows, the windows are provided corresponding to the side of the shell, the length of the side of the shell is L, and along the length direction of the side of the shell, the length of the area occupied by the plurality of windows is a, which satisfies 0.4≤a/L≤0.8. The present invention improves the bonding strength between the battery cell shell and the battery pack when bonding the battery cell by providing windows on the insulating film, thereby improving the life and safety of the battery pack; by controlling the length of the area occupied by the plurality of windows, it is ensured that the insulation effect of the battery cell is not affected while the bonding strength is improved.

Description

电芯及电池包Battery Cells and Battery Packs

技术领域Technical Field

本发明涉及电池技术领域,具体涉及电芯及电池包。The present invention relates to the technical field of batteries, and in particular to battery cells and battery packs.

背景技术Background technique

电池一般包括电池内部结构和电池外部结构,电池外部结构主要包括电芯盖板、电芯壳体和电芯绝缘部件。电芯壳体上的绝缘部件可以防止金属外壳与外部短接,起到绝缘的作用,也可以起到保护的作用,以防止电芯壳体的磨损、刮花。The battery generally includes an internal structure and an external structure. The external structure mainly includes a cell cover, a cell shell and a cell insulating component. The insulating component on the cell shell can prevent the metal shell from short-circuiting with the outside, play an insulating role, and also play a protective role to prevent the cell shell from being worn or scratched.

然而,在电芯与电池包之间进行粘接时,受到绝缘部件影响,电芯与电池包之间的连接强度降低,影响电池包的寿命与安全性。However, when the battery cell and the battery pack are bonded together, the connection strength between the battery cell and the battery pack is reduced due to the influence of the insulating components, which affects the life and safety of the battery pack.

发明内容Summary of the invention

有鉴于此,本发明提供了一种电芯及电池包,以解决绝缘部件影响电芯之与电池包间的连接强度的问题。In view of this, the present invention provides a battery cell and a battery pack to solve the problem that the insulating component affects the connection strength between the battery cell and the battery pack.

第一方面,本发明提供了一种电芯,包括:壳体;绝缘膜,包覆在所述壳体的外侧;所述绝缘膜开设有多个开窗,所述开窗对应所述壳体的侧面设置,所述壳体的侧面的长度为L,沿所述壳体的侧面的长度方向,多个所述开窗占据区域的长度为a,满足0.4≤a/L≤0.8。In a first aspect, the present invention provides a battery cell, comprising: a shell; an insulating film, coated on the outside of the shell; the insulating film is provided with a plurality of windows, the windows are arranged corresponding to the side surfaces of the shell, the length of the side surface of the shell is L, and along the length direction of the side surface of the shell, the length of the area occupied by the plurality of windows is a, satisfying 0.4≤a/L≤0.8.

有益效果:通过对绝缘膜开设开窗,在粘接电芯时提高电芯壳体与电池包之间的粘接强度,提高电池包的寿命与安全性;通过对多个开窗占据区域长度的控制,保证在提高粘接强度的同时不影响电芯的绝缘效果。Beneficial effects: By opening windows in the insulating film, the bonding strength between the battery cell shell and the battery pack is improved when bonding the battery cells, thereby improving the life and safety of the battery pack; by controlling the length of the area occupied by multiple windows, it is ensured that the insulation effect of the battery cell is not affected while improving the bonding strength.

在一种可选的实施方式中,沿所述壳体的侧面的长度方向,多个所述开窗位于所述壳体的侧面的中间区域;或者是,沿所述壳体的侧面的长度方向,多个所述开窗位于所述壳体的侧面的一侧;或者是,多个所述开窗分别位于所述壳体的侧面的两侧,沿所述壳体的侧面的长度方向,位于所述壳体侧面的一侧的所述开窗占据区域的长度为a1,位于所述壳体侧面的另一侧的所述开窗占据区域的长度为a2,满足a=a1+a2;或者是,多个所述开窗均匀分布于所述壳体的侧面。In an optional embodiment, along the length direction of the side surface of the shell, the plurality of windows are located in the middle area of the side surface of the shell; or, along the length direction of the side surface of the shell, the plurality of windows are located on one side of the side surface of the shell; or, the plurality of windows are respectively located on both sides of the side surface of the shell, and along the length direction of the side surface of the shell, the length of the area occupied by the windows on one side of the side surface of the shell is a1, and the length of the area occupied by the windows on the other side of the side surface of the shell is a2, satisfying a=a1+a2; or, the plurality of windows are evenly distributed on the side surface of the shell.

在一种可选的实施方式中,多个所述开窗位于所述壳体的侧面的中间区域,多个所述开窗占据区域的长度a为200mm至1000mm;多个所述开窗位于所述壳体的侧面的一侧,多个所述开窗占据区域的长度a为200mm至1000mm,沿所述壳体的侧面的长度方向,多个所述开窗占据区域的边缘至最近的所述壳体的侧面的边缘的距离b为5mm至20mm;多个所述开窗分别位于所述壳体的侧面的两侧,位于所述壳体侧面的一侧的所述开窗占据区域的长度a1为50mm至250mm,位于所述壳体侧面的另一侧的所述开窗占据区域的长度a2为50mm至250mm,沿所述壳体的侧面的长度方向,位于所述壳体侧面的一侧的所述开窗占据区域的边缘至最近的所述壳体的侧面的边缘的距离b1为5mm至20mm,位于所述壳体侧面的另一侧的所述开窗占据区域的边缘至最近的所述壳体的侧面的边缘的距离b2为5mm至20mm。In an optional embodiment, multiple windows are located in the middle area of the side of the shell, and the length a of the area occupied by the multiple windows is 200mm to 1000mm; multiple windows are located on one side of the side of the shell, and the length a of the area occupied by the multiple windows is 200mm to 1000mm, and along the length direction of the side of the shell, the distance b from the edge of the area occupied by the multiple windows to the nearest edge of the side of the shell is 5mm to 20mm; multiple windows are respectively located on both sides of the side of the shell, the length a1 of the area occupied by the windows located on one side of the shell side is 50mm to 250mm, and the length a2 of the area occupied by the windows located on the other side of the shell side is 50mm to 250mm, along the length direction of the side of the shell, the distance b1 from the edge of the window occupied area located on one side of the shell side to the nearest edge of the side of the shell is 5mm to 20mm, and the distance b2 from the edge of the window occupied area located on the other side of the shell side to the nearest edge of the side of the shell is 5mm to 20mm.

在一种可选的实施方式中,相邻的两个所述开窗的中心距m为10mm至30mm。In an optional embodiment, the center distance m between two adjacent windows is 10 mm to 30 mm.

在一种可选的实施方式中,所述开窗为圆形、椭圆形或多边形。In an optional embodiment, the window is circular, elliptical or polygonal.

在一种可选的实施方式中,所述开窗为圆形,所述开窗半径R为2mm至10mm;所述开窗为矩形,所述开窗的宽度为8mm至46mm,所述开窗的长度为5mm至20mm。In an optional embodiment, the window is circular, and the window radius R is 2 mm to 10 mm; the window is rectangular, and the window width is 8 mm to 46 mm, and the window length is 5 mm to 20 mm.

有益效果:使开窗半径具有合适的尺寸,既能够提升开窗面积,提高电芯壳体与电池包之间的粘接强度,又可以保证电芯的绝缘效果。Beneficial effect: The window opening radius has a suitable size, which can not only increase the window opening area and improve the bonding strength between the battery cell shell and the battery pack, but also ensure the insulation effect of the battery cell.

在一种可选的实施方式中,所述开窗为圆形,沿所述壳体的侧面的宽度方向,所述开窗的边缘至所述壳体的侧面的边缘的距离为n,满足n大于1mm;所述开窗为矩形,沿所述壳体的侧面的宽度方向,所述开窗的边缘至所述壳体的侧面的边缘的距离为n,满足n大于2mm。In an optional embodiment, the window is circular, and along the width direction of the side of the shell, the distance from the edge of the window to the edge of the side of the shell is n, satisfying that n is greater than 1 mm; the window is rectangular, and along the width direction of the side of the shell, the distance from the edge of the window to the edge of the side of the shell is n, satisfying that n is greater than 2 mm.

在一种可选的实施方式中,所述壳体的长度Z为200mm至1200mm,所述壳体的宽度X为50mm至200mm,所述壳体的厚度Y为12mm至50mm。In an optional implementation, the length Z of the shell is 200 mm to 1200 mm, the width X of the shell is 50 mm to 200 mm, and the thickness Y of the shell is 12 mm to 50 mm.

在一种可选的实施方式中,所述绝缘膜的厚度h为50μm至200μm。In an optional implementation, the thickness h of the insulating film is 50 μm to 200 μm.

有益效果:通过对绝缘膜厚度的控制,以满足绝缘膜贴合壳体表面的强度要求。Beneficial effect: By controlling the thickness of the insulating film, the strength requirement of the insulating film fitting the shell surface can be met.

第二方面,本发明还提供了一种电池包,包括上述的电芯。In a second aspect, the present invention further provides a battery pack, comprising the above-mentioned battery cell.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

为了更清楚地说明本发明具体实施方式或现有技术中的技术方案,下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图是本发明的一些实施方式,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

图1为本发明实施例的电芯的爆炸结构示意图;FIG1 is a schematic diagram of an exploded structure of a battery cell according to an embodiment of the present invention;

图2为本发明实施例的多个开窗位于壳体的侧面的中间的结构示意图;FIG2 is a schematic diagram of a structure in which a plurality of windows are located in the middle of a side surface of a housing according to an embodiment of the present invention;

图3为图2中A的局部放大示意图;FIG3 is a partial enlarged schematic diagram of A in FIG2 ;

图4为本发明实施例的电芯的整体结构示意图;FIG4 is a schematic diagram of the overall structure of a battery cell according to an embodiment of the present invention;

图5为本发明实施例的多个开窗位于壳体的侧面的一侧的结构示意图;FIG5 is a schematic structural diagram of a plurality of windows located on one side of a side surface of a housing according to an embodiment of the present invention;

图6为本发明实施例的多个开窗位于壳体的侧面的两侧的结构示意图;FIG6 is a schematic structural diagram of a plurality of windows located on both sides of a side surface of a housing according to an embodiment of the present invention;

图7为本发明实施例的多个开窗均匀分布于壳体的侧面的结构示意图。FIG. 7 is a schematic structural diagram of a plurality of windows evenly distributed on the side of a housing according to an embodiment of the present invention.

附图标记说明:Description of reference numerals:

10、壳体;20、绝缘膜;21、开窗;30、极组;40、顶盖;50、贴片。10. Shell; 20. Insulating film; 21. Window; 30. Pole group; 40. Top cover; 50. Patch.

具体实施方式Detailed ways

为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

下面结合图1至图7,描述本发明的实施例。The embodiments of the present invention are described below in conjunction with FIG. 1 to FIG. 7 .

根据本发明的实施例,一方面,提供了一种电芯,包括:壳体10和绝缘膜20,绝缘膜20包覆在壳体10的外侧。绝缘膜20开设有多个开窗21,开窗21对应壳体10的侧面设置,壳体10的侧面的长度为L,沿壳体10的侧面的长度方向,多个开窗21占据区域的长度为a,满足0.4≤a/L≤0.8。According to an embodiment of the present invention, on the one hand, a battery cell is provided, comprising: a shell 10 and an insulating film 20, wherein the insulating film 20 is coated on the outer side of the shell 10. The insulating film 20 is provided with a plurality of windows 21, and the windows 21 are arranged corresponding to the side of the shell 10, the length of the side of the shell 10 is L, and the length of the area occupied by the plurality of windows 21 along the length direction of the side of the shell 10 is a, satisfying 0.4≤a/L≤0.8.

应用本实施例的电芯,通过对绝缘膜20开设开窗21,在粘接电芯时提高电芯壳体10与电池包之间的粘接强度,提高电池包的寿命与安全性;通过对多个开窗21占据区域长度的控制,保证在提高粘接强度的同时不影响电芯的绝缘效果。By using the battery cell of this embodiment, by opening windows 21 in the insulating film 20, the bonding strength between the battery cell housing 10 and the battery pack is improved when the battery cell is bonded, thereby improving the life and safety of the battery pack; by controlling the length of the area occupied by the multiple windows 21, it is ensured that the insulation effect of the battery cell is not affected while the bonding strength is improved.

需要说明的是,多个开窗21占据区域的包括相邻两个开窗21之间的部分。It should be noted that the area occupied by the multiple windows 21 includes the portion between two adjacent windows 21 .

需要说明的是,在本实施例中,电芯使用结构胶进行粘接。It should be noted that, in this embodiment, the battery cells are bonded using structural adhesive.

需要说明的是,绝缘膜20多为光滑表面,光滑表面使得结构胶与绝缘膜20之间的粘附力较低,进而导致相邻电芯粘接强度降低。因此,通过设置开窗21,使壳体10在开窗21位置与结构胶直接接触,从而增加粘接强度。It should be noted that the insulating film 20 is mostly a smooth surface, which makes the adhesion between the structural adhesive and the insulating film 20 lower, thereby reducing the bonding strength between adjacent cells. Therefore, by providing the window 21, the housing 10 is in direct contact with the structural adhesive at the position of the window 21, thereby increasing the bonding strength.

具体的,本实施例中的电芯为刀片电芯。Specifically, the battery cell in this embodiment is a blade battery cell.

当然,在其他可替代实施方式中,电芯还可以为方壳电芯,开窗设置于方壳电芯的底部或其他侧面。Of course, in other alternative embodiments, the battery cell may also be a square shell battery cell, and the window is arranged at the bottom or other sides of the square shell battery cell.

值得说明的是,通过开设若干个开窗21,在满足电芯绝缘效果的同时进一步提高电芯壳体10与电池包之间粘接强度。It is worth noting that by providing a plurality of windows 21 , the bonding strength between the cell housing 10 and the battery pack is further improved while satisfying the insulation effect of the cell.

在一个实施例中,如图2所示,沿壳体10的侧面的长度方向,多个开窗21位于壳体10的侧面的中间区域;或者是,沿壳体10的侧面的长度方向,多个开窗21位于壳体10的侧面的一侧;或者是,多个开窗21分别位于10壳体的侧面的两侧,沿壳体10的侧面的长度方向,位于壳体10侧面的一侧的开窗21占据区域的长度为a1,位于壳体10侧面的另一侧的开窗21占据区域的长度为a2,满足a=a1+a2;或者是,多个开窗21均匀分布于壳体10的侧面。In one embodiment, as shown in Figure 2, along the length direction of the side of the shell 10, multiple windows 21 are located in the middle area of the side of the shell 10; or, along the length direction of the side of the shell 10, multiple windows 21 are located on one side of the side of the shell 10; or, multiple windows 21 are respectively located on both sides of the side of the shell 10, and along the length direction of the side of the shell 10, the length of the area occupied by the windows 21 on one side of the side of the shell 10 is a1, and the length of the area occupied by the windows 21 on the other side of the side of the shell 10 is a2, satisfying a=a1+a2; or, multiple windows 21 are evenly distributed on the side of the shell 10.

在本实施例中,如图2所示,多个开窗21位于壳体10的侧面的中间区域。In this embodiment, as shown in FIG. 2 , a plurality of windows 21 are located in the middle area of the side surface of the housing 10 .

值得说明的是,涂结构胶的位置一般在电芯中间,两端位置涂胶量较少,所以将多个开窗21设置于壳体10的侧面的中间区域更利于提高电芯壳体10与电池包之间的粘接强度。It is worth noting that the structural adhesive is generally applied in the middle of the battery cell, with less adhesive applied at the two ends. Therefore, setting multiple windows 21 in the middle area of the side of the shell 10 is more conducive to improving the bonding strength between the battery cell shell 10 and the battery pack.

当然,请参阅图5,在另一种实施例中,多个开窗21位于壳体10的侧面的一侧。Of course, referring to FIG. 5 , in another embodiment, a plurality of windows 21 are located on one side of the side surface of the housing 10 .

当然,请参阅图6,在又一种实施例中,多个开窗21分别位于壳体10的侧面的两侧,沿壳体10的侧面的长度方向,位于壳体10侧面的一侧的开窗21占据区域的长度为a1,位于壳体10侧面的另一侧的开窗21占据区域的长度为a2,满足a=a1+a2。Of course, please refer to Figure 6. In another embodiment, multiple windows 21 are respectively located on both sides of the side of the shell 10. Along the length direction of the side of the shell 10, the length of the area occupied by the window 21 on one side of the side of the shell 10 is a1, and the length of the area occupied by the window 21 on the other side of the side of the shell 10 is a2, satisfying a=a1+a2.

当然,请参阅图7,在其他可替代实施例中,多个开窗21均匀分布于壳体10的侧面。Of course, referring to FIG. 7 , in other alternative embodiments, the plurality of windows 21 are evenly distributed on the side surface of the housing 10 .

在一个实施例中,如图2所示,多个开窗21位于壳体10的侧面的中间区域,多个开窗21占据区域的长度a为200mm至1000mm。In one embodiment, as shown in FIG. 2 , the plurality of windows 21 are located in a middle area of a side surface of the housing 10 , and the length a of the area occupied by the plurality of windows 21 is 200 mm to 1000 mm.

具体的,在本实施例中,多个开窗21占据区域的长度a为250mm,沿壳体10的侧面的长度方向,多个开窗21占据区域的边缘至壳体10的侧面的边缘的距离为125mm。Specifically, in this embodiment, the length a of the area occupied by the multiple windows 21 is 250 mm, and along the length direction of the side of the shell 10, the distance from the edge of the area occupied by the multiple windows 21 to the edge of the side of the shell 10 is 125 mm.

需要说明的是,沿壳体10的侧面的长度方向,多个开窗21占据区域的边缘至壳体10的侧面的边缘的距离也即未开设开窗21的区域的长度。It should be noted that, along the length direction of the side surface of the shell 10 , the distance from the edge of the area occupied by the multiple windows 21 to the edge of the side surface of the shell 10 is also the length of the area without the windows 21 .

当然,请参阅图5,在另一种实施例中,多个开窗21位于壳体10的侧面的一侧,多个开窗21占据区域的长度a为200mm至1000mm,沿壳体10的侧面的长度方向,多个开窗21占据区域的边缘至最近的壳体10的侧面的边缘的距离b为5mm至20mm。Of course, please refer to Figure 5, in another embodiment, the multiple windows 21 are located on one side of the side of the shell 10, the length a of the area occupied by the multiple windows 21 is 200mm to 1000mm, and along the length direction of the side of the shell 10, the distance b from the edge of the area occupied by the multiple windows 21 to the edge of the nearest side of the shell 10 is 5mm to 20mm.

当然,请参阅图6,在又一种实施例中,多个开窗21分别位于壳体10的侧面的两侧,位于壳体10侧面的一侧的开窗21占据区域的长度a1为50mm至250mm,位于壳体10侧面的另一侧的开窗21占据区域的长度a2为50mm至250mm,沿壳体10的侧面的长度方向,位于壳体10侧面的一侧的开窗21占据区域的边缘至最近的壳体10的侧面的边缘的距离b1为5mm至20mm,位于壳体10侧面的另一侧的开窗21占据区域的边缘至最近的壳体10的侧面的边缘的距离b2为5mm至20mm。Of course, please refer to Figure 6. In another embodiment, multiple windows 21 are respectively located on both sides of the side of the shell 10, and the length a1 of the area occupied by the window 21 on one side of the side of the shell 10 is 50mm to 250mm, and the length a2 of the area occupied by the window 21 on the other side of the side of the shell 10 is 50mm to 250mm. Along the length direction of the side of the shell 10, the distance b1 from the edge of the area occupied by the window 21 on one side of the side of the shell 10 to the edge of the nearest side of the shell 10 is 5mm to 20mm, and the distance b2 from the edge of the area occupied by the window 21 on the other side of the side of the shell 10 to the edge of the nearest side of the shell 10 is 5mm to 20mm.

在一个实施例中,如图3所示,相邻的两个开窗21的中心距m为10mm至30mm。In one embodiment, as shown in FIG. 3 , the center distance m between two adjacent windows 21 is 10 mm to 30 mm.

具体的,在本实施例中,相邻的两个开窗21的中心距m为20mm。Specifically, in this embodiment, the center distance m between two adjacent windows 21 is 20 mm.

值得说明的是,若m的取值过小,也即相邻的两个开窗21之间的距离过近,相邻两个开窗21之间剩余的绝缘膜20则过少,不易保证绝缘膜20与壳体10的连接强度;若m的取值过大,也即相邻两个开窗21之间的距离过远,无法保证电芯与电芯或电芯与其他部件的粘贴强度。It is worth noting that if the value of m is too small, that is, the distance between two adjacent windows 21 is too close, the remaining insulating film 20 between the two adjacent windows 21 is too small, and it is difficult to ensure the connection strength between the insulating film 20 and the shell 10; if the value of m is too large, that is, the distance between two adjacent windows 21 is too far, the bonding strength between the battery cells or between the battery cells and other components cannot be guaranteed.

在一个实施例中,如图1和图2所示,开窗21为圆形,开窗21半径R为2mm至10mm。In one embodiment, as shown in FIG. 1 and FIG. 2 , the window 21 is circular, and the radius R of the window 21 is 2 mm to 10 mm.

具体的,在本实施例中,开窗21半径R为4mm。Specifically, in this embodiment, the radius R of the window 21 is 4 mm.

当然,在另一种实施例中,开窗21为矩形,开窗21的宽度为8mm至46mm,开窗21的长度为5mm至20mm。Of course, in another embodiment, the window 21 is rectangular, the width of the window 21 is 8 mm to 46 mm, and the length of the window 21 is 5 mm to 20 mm.

当然,在其他可替代实施方式中,开窗21还可以为其他形状,例如其他多边形、椭圆形等。Of course, in other alternative embodiments, the window 21 may also be in other shapes, such as other polygons, ellipses, etc.

值得说明的是,当开窗21的面积过大时,电芯与电池包之间的粘接强度得到提高,但此时因开窗21的面积过大导致绝缘膜20的绝缘性能不合格;当开窗21的面积过小时,虽然绝缘膜20的绝缘性能仍在范围内,但是电芯与电池包之间的粘接强度没有得到充分的提升。因此,使开窗21半径具有合适的尺寸,既能够提升开窗21面积,提高电芯与电池包之间的粘接强度,又可以保证电芯的绝缘效果。It is worth noting that when the area of the window 21 is too large, the bonding strength between the battery cell and the battery pack is improved, but at this time, the insulation performance of the insulating film 20 is unqualified due to the large area of the window 21; when the area of the window 21 is too small, although the insulation performance of the insulating film 20 is still within the range, the bonding strength between the battery cell and the battery pack is not fully improved. Therefore, making the radius of the window 21 have a suitable size can not only increase the area of the window 21, improve the bonding strength between the battery cell and the battery pack, but also ensure the insulation effect of the battery cell.

在一个实施例中,如图3所示,开窗21为圆形,沿壳体10的侧面的宽度方向,开窗21的边缘至壳体10的侧面的边缘的距离为n,满足n大于1mm。In one embodiment, as shown in FIG. 3 , the window 21 is circular, and along the width direction of the side surface of the shell 10 , the distance from the edge of the window 21 to the edge of the side surface of the shell 10 is n, and n satisfies that n is greater than 1 mm.

具体的,在本实施例中,开窗21的边缘至壳体10的侧面的边缘的距离n为3.5mm。Specifically, in this embodiment, the distance n from the edge of the window 21 to the edge of the side surface of the housing 10 is 3.5 mm.

需要说明的是,沿壳体10的侧面的宽度方向,多个开窗21位于壳体10的侧面的中间位置,也即,开窗21的上边缘至壳体10的侧面的上边缘的距离与开窗21的下边缘至壳体10的侧面的下边缘的距离相等。It should be noted that along the width direction of the side of the shell 10, the multiple windows 21 are located in the middle position of the side of the shell 10, that is, the distance from the upper edge of the window 21 to the upper edge of the side of the shell 10 is equal to the distance from the lower edge of the window 21 to the lower edge of the side of the shell 10.

当然,在另一种实施例中,开窗21为矩形,沿壳体10的侧面的宽度方向,开窗21的边缘至壳体10的侧面的边缘的距离为n,满足n大于2mm。Of course, in another embodiment, the window 21 is rectangular, and along the width direction of the side of the shell 10, the distance from the edge of the window 21 to the edge of the side of the shell 10 is n, and n satisfies that n is greater than 2 mm.

值得说明的是,若n的取值过小,也即开窗21的边缘至壳体10的侧面的边缘的距离过近,开窗21的边缘至壳体10的侧面的边缘之间剩余的绝缘膜20则过少,不易保证绝缘膜20与壳体10的连接强度;若n的取值过大,也即开窗21的边缘至壳体10的侧面的边缘的距离过远,无法保证电芯与电芯或电芯与其他部件的粘贴强度。It is worth noting that if the value of n is too small, that is, the distance from the edge of the window 21 to the edge of the side of the shell 10 is too close, the remaining insulating film 20 between the edge of the window 21 and the edge of the side of the shell 10 is too small, and it is difficult to ensure the connection strength between the insulating film 20 and the shell 10; if the value of n is too large, that is, the distance from the edge of the window 21 to the edge of the side of the shell 10 is too far, the bonding strength between the battery cells or between the battery cells and other components cannot be guaranteed.

在一个实施例中,如图4所示,壳体10的长度Z为200mm至1200mm,壳体10的宽度X为50mm至200mm,壳体10的厚度Y为12mm至50mm。In one embodiment, as shown in FIG. 4 , the length Z of the housing 10 is 200 mm to 1200 mm, the width X of the housing 10 is 50 mm to 200 mm, and the thickness Y of the housing 10 is 12 mm to 50 mm.

具体的,在本实施例中,壳体10的长度Z为500mm,壳体10的宽度X为120mm,壳体10的厚度Y为15mm。Specifically, in this embodiment, the length Z of the housing 10 is 500 mm, the width X of the housing 10 is 120 mm, and the thickness Y of the housing 10 is 15 mm.

需要说明的是,在本实施例中,电芯的小面(也即图4中Y-Z面)通过结构胶与其他电芯粘接,开窗21对应电芯的小面开设。It should be noted that, in this embodiment, the small surface of the battery cell (i.e., the Y-Z surface in FIG. 4 ) is bonded to other battery cells by structural adhesive, and the window 21 is opened corresponding to the small surface of the battery cell.

需要进一步说明的是,还可以在其他侧面(例如图4中X-Z面)开设开窗21,以进一步提高电芯与电池包之间的粘接强度。It should be further explained that a window 21 may be opened on other side surfaces (e.g., the X-Z surface in FIG. 4 ) to further improve the bonding strength between the battery cell and the battery pack.

需要说明的是,在本实施例中,壳体10的侧面的长度L等于壳体10的长度Z,也即壳体10的侧面的长度L也为500mm。It should be noted that, in the present embodiment, the length L of the side surface of the housing 10 is equal to the length Z of the housing 10 , that is, the length L of the side surface of the housing 10 is also 500 mm.

需要说明的是,在本实施例中,壳体10的厚度Y=2×R+2×n。It should be noted that, in this embodiment, the thickness of the housing 10 is Y=2×R+2×n.

在一个实施例中,绝缘膜20的厚度h为50μm至200μm。In one embodiment, the thickness h of the insulating film 20 is 50 μm to 200 μm.

具体的,在本实施例中,绝缘膜20的厚度h为110μm。Specifically, in this embodiment, the thickness h of the insulating film 20 is 110 μm.

值得说明的是,通过对绝缘膜20的厚度的控制,以满足绝缘膜20贴合壳体10表面的强度要求。It is worth noting that the thickness of the insulating film 20 is controlled to meet the strength requirement of the insulating film 20 adhering to the surface of the housing 10 .

在一个实施例中,如图1所示,电芯还包括极组30、顶盖40和贴片50,顶盖40设置有两个,两个顶盖40分别设置于壳体10的两侧并与壳体10围合形成容纳腔,极组30设置于容纳腔内,贴片50设置于顶盖40的表面,以起到绝缘作用。In one embodiment, as shown in FIG. 1 , the battery cell further includes a pole group 30, a top cover 40 and a patch 50. Two top covers 40 are provided. The two top covers 40 are respectively provided on both sides of the shell 10 and are enclosed with the shell 10 to form a receiving cavity. The pole group 30 is provided in the receiving cavity, and the patch 50 is provided on the surface of the top cover 40 to play an insulating role.

下面对不同开窗21尺寸的电芯进行剪切粘接强度测试,具体测试结果如表1至表4所示。The shear bonding strength test is performed on the battery cells with different window opening 21 sizes. The specific test results are shown in Tables 1 to 4.

表1剪切粘接强度测试结果一。Table 1 Shear bond strength test results 1.

其中,表1中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=580mm×120mm×16mm。The dimensions of the battery cells in the comparative examples and embodiments in Table 1 are consistent, which are length×width×thickness=580mm×120mm×16mm.

需要说明的是,表1中各对比例及实施例的电芯的多个开窗21位于壳体10的侧面的一侧。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 1 are located on one side of the side surface of the housing 10 .

由表1的测试结果可以看出,当a/L<0.4时,电芯与电池包之间的粘接强度小于8Mpa,不满足要求;当a/L≥0.4时,电芯与电池包之间的粘接强度大于8Mpa,满足要求。It can be seen from the test results in Table 1 that when a/L is less than 0.4, the bonding strength between the battery cell and the battery pack is less than 8 MPa, which does not meet the requirements; when a/L is greater than 0.4, the bonding strength between the battery cell and the battery pack is greater than 8 MPa, which meets the requirements.

表2 剪切粘贴强度测试结果二。Table 2 Shear and paste strength test results II.

其中,表2中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=460mm×100mm×15mm。Among them, the dimensions of the battery cells of the comparative examples and embodiments in Table 2 are consistent, which are length×width×thickness=460mm×100mm×15mm.

需要说明的是,表2中各对比例及实施例的电芯的多个开窗21分别位于壳体10的侧面的两侧。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 2 are respectively located on both sides of the side surface of the housing 10 .

由表2的测试结果可以看出,当a/L<0.4时,电芯与电池包之间的粘接强度小于8Mpa,不满足要求;当a/L≥0.4时,电芯与电池包之间的粘接强度大于8Mpa,满足要求。It can be seen from the test results in Table 2 that when a/L<0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, which does not meet the requirements; when a/L≥0.4, the bonding strength between the battery cell and the battery pack is greater than 8Mpa, which meets the requirements.

表3剪切粘接强度测试结果三。Table 3 Shear bond strength test results III.

其中,表3中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=250mm×50mm×14mm。The dimensions of the battery cells in the comparative examples and embodiments in Table 3 are consistent, which are length×width×thickness=250mm×50mm×14mm.

需要说明的是,表3中各对比例及实施例的电芯的多个开窗21分别位于壳体10的侧面的两侧。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 3 are respectively located on both sides of the side surface of the housing 10 .

由表3的测试结果可以看出,当a/L<0.4时,电芯与电池包之间的粘接强度小于8Mpa,不满足要求;当a/L≥0.4时,电芯与电池包之间的粘接强度大于8Mpa,满足要求。It can be seen from the test results in Table 3 that when a/L<0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, which does not meet the requirements; when a/L≥0.4, the bonding strength between the battery cell and the battery pack is greater than 8Mpa, which meets the requirements.

表4剪切粘接强度测试结果四。Table 4 Shear bond strength test results IV.

其中,表4中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=1200mm×200mm×50mm。Among them, the dimensions of the battery cells of the comparative examples and embodiments in Table 4 are consistent, which are length×width×thickness=1200mm×200mm×50mm.

需要说明的是,表4中各对比例及实施例的电芯的多个开窗21位于壳体10的侧面的中间区域。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 4 are located in the middle area of the side surface of the housing 10 .

由表4的测试结果可以看出,当a/L<0.4时,电芯与电池包之间的粘接强度小于8Mpa,不满足要求;当a/L≥0.4时,电芯与电池包之间的粘接强度大于8Mpa,满足要求。It can be seen from the test results in Table 4 that when a/L<0.4, the bonding strength between the battery cell and the battery pack is less than 8Mpa, which does not meet the requirements; when a/L≥0.4, the bonding strength between the battery cell and the battery pack is greater than 8Mpa, which meets the requirements.

下面对具有不同绝缘膜20的电芯进行绝缘耐电压测试,具体的,使用带导电硅胶的金属板加持在电芯表面,对绝缘膜20表面加压2500N至3000N,并在高压2000V交流电的通电下保持2s,对绝缘膜20的漏电流i的大小进行测试,绝缘膜20的漏电流i应不超过30mA。具体测试结果如表5至表8所示。The following is an insulation withstand voltage test for the battery cells with different insulating films 20. Specifically, a metal plate with conductive silicone is used to support the surface of the battery cell, and the surface of the insulating film 20 is pressed by 2500N to 3000N, and maintained for 2s under the power of high voltage 2000V AC, and the leakage current i of the insulating film 20 is tested. The leakage current i of the insulating film 20 should not exceed 30mA. The specific test results are shown in Tables 5 to 8.

表5绝缘耐电压测试结果一。Table 5 Insulation withstand voltage test results 1.

其中,表5中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=580mm×120mm×16mm。Among them, the dimensions of the battery cells of the comparative examples and embodiments in Table 5 are consistent, which are length×width×thickness=580mm×120mm×16mm.

需要说明的是,表5中各对比例及实施例的电芯的多个开窗21位于壳体10的侧面的一侧。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 5 are located on one side of the side surface of the housing 10 .

由表5的测试结果可以看出,当a/L≤0.8时,绝缘膜20的漏电流i小于30mA,绝缘膜20的绝缘耐电压性能满足要求;当a/L>0.8时,绝缘膜20的漏电流i大于30mA,绝缘膜20的绝缘耐电压性能不满足要求。It can be seen from the test results in Table 5 that when a/L≤0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulation withstand voltage performance of the insulating film 20 meets the requirements; when a/L>0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulation withstand voltage performance of the insulating film 20 does not meet the requirements.

表6绝缘耐电压测试结果二。Table 6 Insulation withstand voltage test results II.

其中,表6中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=460mm×100mm×15mm。Among them, the dimensions of the battery cells of the comparative examples and embodiments in Table 6 are consistent, which are length×width×thickness=460mm×100mm×15mm.

需要说明的是,表6中各对比例及实施例的电芯的多个开窗21分别位于壳体10的侧面的两侧。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 6 are respectively located on both sides of the side surface of the housing 10 .

由表6的测试结果可以看出,当a/L≤0.8时,绝缘膜20的漏电流i小于30mA,绝缘膜20的绝缘耐电压性能满足要求;当a/L>0.8时,绝缘膜20的漏电流i大于30mA,绝缘膜20的绝缘耐电压性能不满足要求。It can be seen from the test results in Table 6 that when a/L≤0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulation withstand voltage performance of the insulating film 20 meets the requirements; when a/L>0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulation withstand voltage performance of the insulating film 20 does not meet the requirements.

表7绝缘耐电压测试结果三。Table 7 Insulation withstand voltage test results III.

其中,表7中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=250mm×50mm×14mm。Among them, the dimensions of the battery cells of the comparative examples and embodiments in Table 7 are consistent, which are length×width×thickness=250mm×50mm×14mm.

需要说明的是,表7中各对比例及实施例的电芯的多个开窗21分别位于壳体10的侧面的两侧。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 7 are respectively located on both sides of the side surface of the housing 10 .

由表7的测试结果可以看出,当a/L≤0.8时,绝缘膜20的漏电流i小于30mA,绝缘膜20的绝缘耐电压性能满足要求;当a/L>0.8时,绝缘膜20的漏电流i大于30mA,绝缘膜20的绝缘耐电压性能不满足要求。It can be seen from the test results in Table 7 that when a/L≤0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulation withstand voltage performance of the insulating film 20 meets the requirements; when a/L>0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulation withstand voltage performance of the insulating film 20 does not meet the requirements.

表8绝缘耐电压测试结果四。Table 8 Insulation withstand voltage test results IV.

其中,表8中各对比例及实施例的电芯的尺寸一致,均为长×宽×厚=1200mm×200mm×50mm。Among them, the dimensions of the battery cells of the comparative examples and embodiments in Table 8 are consistent, all of which are length×width×thickness=1200mm×200mm×50mm.

需要说明的是,表8中各对比例及实施例的电芯的多个开窗21位于壳体10的侧面的中间区域。It should be noted that the multiple windows 21 of the battery cells of the comparative examples and embodiments in Table 8 are located in the middle area of the side surface of the housing 10 .

由表8的测试结果可以看出,当a/L≤0.8时,绝缘膜20的漏电流i小于30mA,绝缘膜20的绝缘耐电压性能满足要求;当a/L>0.8时,绝缘膜20的漏电流i大于30mA,绝缘膜20的绝缘耐电压性能不满足要求。It can be seen from the test results in Table 8 that when a/L≤0.8, the leakage current i of the insulating film 20 is less than 30mA, and the insulation withstand voltage performance of the insulating film 20 meets the requirements; when a/L>0.8, the leakage current i of the insulating film 20 is greater than 30mA, and the insulation withstand voltage performance of the insulating film 20 does not meet the requirements.

值得说明的是,结合表1至表8的测试结果,在绝缘膜20上开设开窗21,当0.4≤a/L≤0.8时,既可以提高电芯与电池包之间的粘接强度,又不影响绝缘膜20的绝缘效果。It is worth noting that, in combination with the test results in Tables 1 to 8, when 0.4≤a/L≤0.8, opening a window 21 on the insulating film 20 can improve the bonding strength between the battery cell and the battery pack without affecting the insulating effect of the insulating film 20 .

根据本发明的实施例,另一方面,还提供了一种电池包,包括上述的电芯。According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising the above-mentioned battery cell.

虽然结合附图描述了本发明的实施例,但是本领域技术人员可以在不脱离本发明的精神和范围的情况下做出各种修改和变型,这样的修改和变型均落入由所附权利要求所限定的范围之内。Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims (6)

1.一种电芯,其特征在于,包括:1. A battery cell, comprising: 壳体;case; 绝缘膜,包覆在所述壳体的外侧;所述绝缘膜开设有多个开窗,所述开窗对应所述壳体的侧面设置,所述壳体的侧面的长度为L,沿所述壳体的侧面的长度方向,多个所述开窗占据区域的长度为a,满足0.4≤a/L≤0.8;An insulating film is coated on the outer side of the shell; the insulating film is provided with a plurality of windows, the windows are arranged corresponding to the side of the shell, the length of the side of the shell is L, and the length of the area occupied by the plurality of windows along the length direction of the side of the shell is a, satisfying 0.4≤a/L≤0.8; 所述开窗为圆形、椭圆形或多边形;The window is circular, elliptical or polygonal; 所述开窗为圆形时,所述开窗的半径R为2mm至10mm;所述开窗为矩形时,所述开窗的宽度为8mm至46mm,所述开窗的长度为5mm至20mm;When the window is circular, the radius R of the window is 2 mm to 10 mm; when the window is rectangular, the width of the window is 8 mm to 46 mm, and the length of the window is 5 mm to 20 mm; 所述开窗为圆形时,沿所述壳体的侧面的宽度方向,所述开窗的边缘至所述壳体的侧面的边缘的距离为n,满足n大于1mm;所述开窗为矩形时,沿所述壳体的侧面的宽度方向,所述开窗的边缘至所述壳体的侧面的边缘的距离为n,满足n大于2mm;When the window is circular, along the width direction of the side surface of the shell, the distance from the edge of the window to the edge of the side surface of the shell is n, and n is greater than 1 mm; when the window is rectangular, along the width direction of the side surface of the shell, the distance from the edge of the window to the edge of the side surface of the shell is n, and n is greater than 2 mm; 所述壳体的长度Z为200mm至1200mm,所述壳体的宽度X为50mm至200mm,所述壳体的厚度Y为12mm至50mm。The length Z of the shell is 200 mm to 1200 mm, the width X of the shell is 50 mm to 200 mm, and the thickness Y of the shell is 12 mm to 50 mm. 2.根据权利要求1所述的电芯,其特征在于,沿所述壳体的侧面的长度方向,多个所述开窗位于所述壳体的侧面的中间区域;或者是,2. The battery cell according to claim 1, characterized in that, along the length direction of the side surface of the shell, the plurality of windows are located in the middle area of the side surface of the shell; or, 沿所述壳体的侧面的长度方向,多个所述开窗位于所述壳体的侧面的一侧;或者是,Along the length direction of the side surface of the shell, the plurality of windows are located on one side of the side surface of the shell; or, 多个所述开窗分别位于所述壳体的侧面的两侧,沿所述壳体的侧面的长度方向,位于所述壳体侧面的一侧的所述开窗在占据区域的长度为a1,位于所述壳体侧面的另一侧的所述开窗在占据区域的长度为a2,满足a=a1+a2;或者是,The plurality of windows are respectively located on both sides of the side surface of the shell, and along the length direction of the side surface of the shell, the length of the window located on one side of the side surface of the shell in the occupied area is a1, and the length of the window located on the other side of the side surface of the shell in the occupied area is a2, satisfying a=a1+a2; or, 多个所述开窗均匀分布于所述壳体的侧面。The plurality of windows are evenly distributed on the side surface of the shell. 3.根据权利要求2所述的电芯,其特征在于,多个所述开窗位于所述壳体的侧面的中间区域,多个所述开窗占据区域的长度a为200mm至1000mm;3. The battery cell according to claim 2, characterized in that the plurality of windows are located in the middle area of the side surface of the shell, and the length a of the area occupied by the plurality of windows is 200 mm to 1000 mm; 多个所述开窗位于所述壳体的侧面的一侧,多个所述开窗占据区域的长度a为200mm至1000mm,沿所述壳体的侧面的长度方向,多个所述开窗占据区域的边缘至最近的所述壳体的侧面的边缘的距离b为5mm至20mm;The plurality of windows are located on one side of the side of the shell, the length a of the area occupied by the plurality of windows is 200 mm to 1000 mm, and along the length direction of the side of the shell, the distance b from the edge of the area occupied by the plurality of windows to the edge of the nearest side of the shell is 5 mm to 20 mm; 多个所述开窗分别位于所述壳体的侧面的两侧,位于所述壳体侧面的一侧的所述开窗占据区域的长度a1为50mm至250mm,位于所述壳体侧面的另一侧的所述开窗占据区域的长度a2为50mm至250mm,沿所述壳体的侧面的长度方向,位于所述壳体侧面的一侧的所述开窗占据区域的边缘至最近的所述壳体的侧面的边缘的距离b1为5mm至20mm,位于所述壳体侧面的另一侧的所述开窗占据区域的边缘至最近的所述壳体的侧面的边缘的距离b2为5mm至20mm。The multiple windows are respectively located on both sides of the side of the shell, the length a1 of the area occupied by the window on one side of the shell side is 50mm to 250mm, the length a2 of the area occupied by the window on the other side of the shell side is 50mm to 250mm, and along the length direction of the side of the shell, the distance b1 from the edge of the window occupied area on one side of the shell side to the nearest edge of the side of the shell is 5mm to 20mm, and the distance b2 from the edge of the window occupied area on the other side of the shell side to the nearest edge of the side of the shell is 5mm to 20mm. 4.根据权利要求1-3任一项所述的电芯,其特征在于,相邻的两个所述开窗的中心距m为10mm至30mm。4. The battery cell according to any one of claims 1 to 3, characterized in that a center distance m between two adjacent windows is 10 mm to 30 mm. 5.根据权利要求1-3任一项所述的电芯,其特征在于,所述绝缘膜的厚度h为50μm至200μm。5 . The battery cell according to claim 1 , wherein a thickness h of the insulating film is 50 μm to 200 μm. 6.一种电池包,其特征在于,包括权利要求1至5中任一项所述的电芯。6. A battery pack, comprising the battery cell according to any one of claims 1 to 5.
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