Battery cell, battery pack and manufacturing process of battery cell

Abstract

The application relates to the technical field of electric cores, and discloses an electric core, a battery pack and a manufacturing process of the electric core. The electric core comprises a pole group and an encapsulating film. One end of a folding edge part is obliquely or vertically arranged at one end of an extension part away from the pole group, and the other end is wound to form a winding core part in a winding core shape. The electric core with the structure can effectively prevent the cutting edge from contacting and damaging the side surface of the encapsulating main body, because the cutting edge is located at the innermost side of the winding core part and is away from the side surface of the encapsulating main body. Meanwhile, the winding core part is formed by winding, the encapsulating films at the winding core part are smoothly arranged, the encapsulating films at the winding core part are mutually adhered and effectively tightened after winding, the winding core part can be stably kept in the post-winding shape, the winding core part comprises at least two layers of encapsulating films, the winding core part can be effectively prevented from loosening and deforming, the winding core part does not need to be heat-pressed to be shaped after winding, the manufacturing process of the folding edge structure of the electric core can be simplified, and the production efficiency of the electric core is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cells, in particular to a battery cell, a battery pack and a manufacturing process of the battery cell. BACKGROUND

[0002] The soft package battery cell includes a pole group and a packaging film, the pole group is packaged in the packaging film, when the soft package battery cell is secondarily packaged, the packaging film is cut, thus a sharp edge is formed at the cutting edge of the packaging film, when the cutting edge is bent, the packaging film near the side surface of the pole group after the cutting edge is bent is easy to be lifted, the bent edge segment after bending is easy to be lifted, thus the cutting edge is easy to scratch the outer surface of the packaging film, thus the sealing performance of the soft package battery cell is affected, and the safety performance of the soft package battery cell is affected. SUMMARY

[0003] Therefore, the present application provides a battery cell, a battery pack and a manufacturing process of the battery cell, to solve the problem that the packaging film of the soft package battery cell is easy to be lifted after being bent.

[0004] In a first aspect, the present application provides a battery cell, comprising:

[0005] a pole group;

[0006] a packaging film, comprising a packaging body and an edge sealing area, the packaging body is wrapped outside the pole group, the edge sealing area is located outside the pole group, the edge sealing area comprises an extension part and a bent edge structure, the extension part extends towards the outside of the pole group; the bent edge structure comprises a bent edge part and a winding core part, one end of the bent edge part is obliquely or vertically arranged at one end of the extension part away from the pole group, the other end of the bent edge part is wound to form the winding core part in a winding core shape, the winding core part comprises at least two turns of the packaging film.

[0007] Advantages: the battery cell with the structure, the winding core part is formed by winding, the cutting edge is located at the innermost side of the winding core part, the cutting edge is away from the side surface of the packaging body, the cutting edge can be effectively prevented from contacting and damaging the side surface of the packaging body, thus the sealing effect of the packaging film and the safety performance of the battery cell are ensured; meanwhile, the winding core part is formed by winding, compared with the 180° bending mode, the bending angle of each layer of the packaging film of the winding core part is greatly reduced, each layer of the packaging film at the winding core part is smoothly wound, the mutual adhesion and effective tightening between each layer of the packaging film of the winding core part after winding can make the winding core part stably maintain the shape after winding, the winding core part comprises at least two turns of the packaging film, the winding core part can be effectively prevented from loosening and deforming, the winding core part after winding does not need to be heat-pressed and shaped, thus the manufacturing process of the bent edge structure of the battery cell can be simplified, and the production efficiency of the battery cell is improved; in addition, the winding core part comprising at least two turns of the packaging film can effectively improve the overall strength of the bent edge structure, compared with the single bent edge and double bent edge modes, the sealing strength of the packaging film can be effectively improved, and the safety performance of the battery cell is improved.

[0008] In an alternative embodiment, the longitudinal section of the winding core part along the thickness direction of the battery cell is circular.

[0009] Beneficial effects: the longitudinal section of the winding core part is circular, which facilitates winding forming and helps to ensure the tightness of the winding core part and to keep the winding core part in a stable circular shape after winding, preventing the winding core part from loosening and deforming.

[0010] In an alternative embodiment, the winding core part is located inside the folding edge part.

[0011] Beneficial effects: such arrangement can make full use of the space between the folding edge part and the side surface of the packaging body to accommodate the winding core part, reducing the space occupied by the folding edge structure in the width direction of the battery cell, and improving the compactness of the overall structure of the battery cell and the volumetric energy density of the battery cell.

[0012] In an alternative embodiment, the included angle between the folding edge part and the extension part is θ, 70°≤θ≤110°.

[0013] Beneficial effects: when the folding edge part is inclined, by controlling the inclination angle, the inward or outward inclination angle is not large, preventing the folding edge structure from occupying too much space in the width direction of the battery cell due to an excessively large inclination angle, and further improving the compactness of the battery cell and the volumetric energy density of the battery cell.

[0014] In an alternative embodiment, θ=90°.

[0015] In an alternative embodiment, along the thickness direction of the battery cell, the height of the side of the packaging body and the folding edge structure extending in the same direction is H, and the height of the folding edge structure is H1, H1≤H.

[0016] Beneficial effects: such arrangement can prevent the top of the folding edge structure from exceeding the top surface of the packaging film, avoiding the folding edge structure occupying space outside the thickness range of the battery cell, thereby helping to ensure the space utilization of the battery cell and further improving the compactness of the battery cell structure and the volumetric energy density of the battery cell.

[0017] In an alternative embodiment, the height of the winding core part is H2,

[0018] Beneficial effects: Such arrangement can ensure that the winding core part has sufficient size, facilitating winding of the winding core part using a rotating shaft, and can make the size of the winding core part on the overall folding edge structure moderate, avoiding the size of the winding core part being too small relative to the folding edge structure, which helps to improve the strength and stability of the overall structure of the folding edge structure. At the same time, In this way, the diameter of the longitudinal section of the winding core part is prevented from being too large, the bottom of the winding core part is prevented from contacting the extending part, contact and wear between the two are avoided, and the packaging effect of the packaging film is ensured.

[0019] In an optional embodiment, the distance between one end of the winding core part towards the side surface of the packaging main body and the side surface of the packaging main body is L, and 0.5mm≤L≤1.5mm.

[0020] Beneficial effects: 0.5mm≤L, in this way, the distance between the winding core part and the side surface of the packaging main body is prevented from being too short, the winding core part is prevented from contacting the side surface of the packaging main body, and contact and wear between the two are prevented; at the same time, L≤1.5mm, in this way, the distance between the winding core part and the side surface of the packaging main body is prevented from being too large, that is, the distance by which the extending part extends out of the group of poles is prevented from being too long, and the extending part and the folding edge structure are prevented from occupying too much space in the width direction of the battery cell.

[0021] In a second aspect, the present application further provides a battery pack comprising the battery cell according to any one of the above-mentioned embodiments. The battery pack comprises the battery cell, has the same technical effects as the battery cell, and will not be described here.

[0022] In a third aspect, the present application further provides a manufacturing process of a battery cell, which is used to manufacture the battery cell according to any one of the above-mentioned embodiments, and comprises the following steps:

[0023] punching the packaging film to form a receiving groove, placing the group of poles in the receiving groove, folding the packaging film and packaging the packaging film outside the group of poles;

[0024] folding the packaging film outside the extending part towards one side in the thickness direction of the battery cell;

[0025] overlapping one end of the packaging film away from the extending part on a rotating shaft, and rotating the rotating shaft to wind the packaging film into a winding core part in the form of a winding core.

[0026] Beneficial effects: the manufacturing process of the battery cell of the present application winds the winding core part into shape by winding, and the folding angle of each layer of the packaging film of the winding core part is greatly reduced compared with the 180° folding method; at the same time, the packaging film at the winding core part is smoothly arranged, and the packaging films of each layer of the winding core part are in close contact and effectively tightened after being wound into shape, so that the winding core part can be stably maintained in the wound form; at the same time, the winding core part comprises at least two layers of the packaging film, which can effectively prevent the winding core part from loosening and deforming, and the winding core part does not need to be heat-pressed into shape after being wound into shape, so that the manufacturing process of the folding edge structure of the battery cell can be simplified, and the production efficiency of the battery cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to make the specific embodiments of the present application or the technical solutions in the prior art clearer, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative work on the basis of the embodiments of the present application also belong to the protection scope of the present application.

[0028] Figure 1 A schematic view of the battery cell described in the background of the present application;

[0029] Figure 2 A side view of a battery cell according to an embodiment of the present application;

[0030] Figure 3 A Figure 2 An enlarged view of part A in FIG. 7;

[0031] Figure 4 A Figure 2 An enlarged view of part A in FIG. 7;

[0032] Figure 5 A side view of another battery cell according to an embodiment of the present application.

[0033] Explanation of reference signs:

[0034] 1, encapsulation film; 11, encapsulation main body; 12, edge sealing area; 121, extension; 122, edge folding structure; 1221, edge folding part; 1222, core winding part. DETAILED DESCRIPTION

[0035] In order to make the specific embodiments of the present application or the technical solutions in the prior art clearer, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative work on the basis of the embodiments of the present application also belong to the protection scope of the present application.

[0036] As Figure 1As shown, the packaging film of the battery cell in the related art includes a packaging body 11' and an edge sealing area 12'. The edge sealing area 12' is bent towards the side surface of the packaging body 11' to form a folded edge structure. During the folding process, the cutting edge of the end portion of the edge sealing area 12' is easy to contact and damage the packaging body 11' located on the inner side thereof. The folding segment is bent by 180°. After the bending, the folded edge segment is parallelly attached to the adjacent packaging film. Since the bending angle of the folded edge segment is too large, the folded edge segment after the bending is difficult to maintain the shape after the folding. The bottom of the folded edge segment is easy to deform and lift up. The bottom of the folded edge segment is the cutting edge. After the deformation and lifting up of the folded edge segment, the cutting edge is easy to contact the side surface of the packaging body 11' and damage the packaging body 11', thereby affecting the sealing performance of the packaging film and the safety of the battery cell.

[0037] As shown in Figure 2 , Figure 3 and Figure 5 , the x direction is called the width direction of the battery cell, the z direction is called the thickness direction of the battery cell, the upper part of the z direction is called the upper part of the battery cell, the lower part of the z direction is called the lower part of the battery cell, the upper surface of the battery cell is the top surface thereof, and the lower surface of the battery cell is the bottom surface thereof.

[0038] The embodiments of the present application will be described below in conjunction with Figures 2 to 5 .

[0039] According to the embodiments of the present application, in one aspect, a battery cell is provided, which includes a pole group and a packaging film 1. The packaging film 1 includes a packaging body 11 and an edge sealing area 12. The packaging body 11 covers the pole group. The edge sealing area 12 is located outside the pole group. The edge sealing area 12 includes an extension part 121 and a folded edge structure 122. The extension part 121 extends towards the outside of the pole group. The folded edge structure 122 includes a folded edge part 1221 and a winding core part 1222. One end of the folded edge part 1221 is obliquely or vertically arranged at the end of the extension part 121 away from the pole group. The other end of the folded edge part 1221 is wound to form a winding core part 1222 in a winding core shape. The winding core part 1222 includes at least two turns of the packaging film 1.

[0040] The cutting edge of the structure is located at the innermost side of the winding core part 1222, and is away from the side surface of the packaging main body 11, which can effectively prevent the cutting edge from contacting and damaging the side surface of the packaging main body 11, thereby ensuring the packaging effect of the packaging film 1 and the safety performance of the battery cell; at the same time, compared with the 180° bending mode, the bending angle of each layer of the packaging film 1 of the winding core part 1222 is greatly reduced, and each layer of the packaging film 1 of the winding core part 1222 is smoothly wound, and after winding and forming, each layer of the packaging film 1 of the winding core part 1222 is tightly attached and effectively tightened, which can stably maintain the winding form of the winding core part 1222, and the winding core part 1222 includes at least two turns of the packaging film 1, which can effectively prevent the winding core part 1222 from loosening and deforming, and the winding core part 1222 does not need to be heat-pressed and shaped after winding, which can simplify the manufacturing process of the battery cell edge folding structure 122 and improve the production efficiency of the battery cell; in addition, the winding core part 1222 including at least two turns of the packaging film 1 can effectively improve the overall strength of the edge folding structure 122, and compared with the single-edge folding and double-edge folding modes, the packaging strength of the packaging film 1 can be effectively improved, and the safety performance of the battery cell can be improved.

[0041] In some embodiments, as shown in Figures 2 to 5 the longitudinal section of the winding core part 1222 along the thickness direction of the battery cell is circular. When the winding core part 1222 is wound and formed, the end of the edge sealing area 12 is overlapped on a cylindrical rotating shaft, and the winding core part 1222 can be wound and formed by rotating the rotating shaft. The longitudinal section of the winding core part 1222 is circular, which is convenient for winding and forming, and is beneficial to ensure the tightening degree of the winding core part 1222 and stably maintain the circular form of the winding core part 1222 after winding, thereby preventing the winding core part 1222 from loosening and deforming.

[0042] In other embodiments, the longitudinal section of the winding core part 1222 along the thickness direction of the battery cell is elliptical or spindle-shaped. At this time, an elliptical cylindrical rotating shaft or a rotating shaft with a corresponding shape is used to wind and form the winding core part 1222.

[0043] In some embodiments, as shown in Figure 3 and Figure 4 the winding core part 1222 is located inside the edge folding part 1221, that is, the winding core part 1222 is located between the side surface of the packaging main body 11 and the edge folding part 1221. This arrangement can make full use of the space between the edge folding part 1221 and the side surface of the packaging main body 11 to accommodate the winding core part 1222, reduce the occupied space of the edge folding structure 122 in the width direction of the battery cell, improve the compactness of the overall structure of the battery cell, and improve the volume energy density of the battery cell.

[0044] In other embodiments, the winding core part 1222 can also be located outside the edge folding part 1221.

[0045] The encapsulation film 1 has a receiving groove, and the electrode assembly is placed in the receiving groove. After being folded in half, the encapsulation film 1 covers the outer surface of the electrode assembly. The two layers of encapsulation film 1 folded outward from the electrode assembly are heat-pressed to form a sealing edge area 12. The sealing edge area 12 is then bent and wrapped to form an extension 121, a folded edge 1221, and a core winding 1222. The extension 121 is approximately parallel to the large surface of the battery cell.

[0046] In some embodiments, the included angle between the folded edge 1221 and the extension 121 is θ, 70°≤θ≤110°. The extension 121 is approximately parallel to the large surface of the battery cell, 70°≤θ≤110°. That is, the folded edge 1221 is bent toward the side of the packaging body 11, or the folded edge 1221 is bent away from the side of the packaging body 11, or the folded edge 1221 is vertically disposed on the extension 121. When the folded edge 1221 is inclined, by controlling its inclination angle to make its inward or outward inclination angle small, it is prevented that the inclination angle of the folded edge structure 122 is too large and occupies too much space in the width direction of the battery cell, which can further improve the compactness and volumetric energy density of the battery cell.

[0047] Optionally, in some embodiments, θ = 90°, that is, the folded edge 1221 is vertically disposed on the extension 121. This arrangement can further improve the compactness of the folded edge structure 122 and reduce the space occupied by the folded edge structure 122 in the width direction of the battery cell. At the same time, the vertical arrangement of the folded edge 1221, which extends along the thickness direction of the battery cell, is beneficial to improving the strength and stability of the folded edge structure 122. When assembling the battery cell, it can improve the anti-collision performance of the folded edge structure 122, thereby effectively protecting the battery cell.

[0048] In some embodiments, such as Figure 3 As shown, the height of the side where the encapsulation body 11 and the folded edge structure 122 extend in the same direction is H, and the height of the folded edge structure 122 is H1, where H1≤H. This arrangement can prevent the top of the folded edge structure 122 from exceeding the top surface of the encapsulation film 1, and avoid the folded edge structure 122 occupying space outside the cell thickness range. This helps to ensure the space utilization rate of the cell and further improves the compactness of the cell structure and the volumetric energy density of the cell.

[0049] A receiving groove is stamped into the encapsulation film 1, and the electrode assembly is disposed within the receiving groove. Since the encapsulation film 1 has a certain degree of ductility, if the receiving groove is too deep, the strength of the encapsulation film 1 in the vicinity of the receiving groove will decrease after stamping, making it difficult to guarantee the sealing effect and encapsulation strength of the encapsulation film 1. The height H of the side of the encapsulation film 1 extending in the same direction as the folded edge structure 122 is approximately the same as the depth of the receiving groove. In some embodiments, the depth H of a single receiving groove is set to 2mm ≤ H ≤ 15mm. This setting can effectively guarantee the strength of the encapsulation film 1 in the vicinity of the receiving groove after stamping, ensuring the sealing effect and encapsulation strength of the encapsulation film 1.

[0050] Optionally, in some embodiments, the encapsulation film 1 comprises an aluminum-plastic film.

[0051] The height of the core portion 1222 extending along the thickness direction of the battery cell also needs to meet certain requirements. For a core portion 1222 with a circular cross-section, the height of the core portion 1222 extending along the thickness direction of the battery cell is the diameter of the cross-section of the core portion 1222. If the diameter of the cross-section of the core portion 1222 is too small, it will be difficult to wind and form the core portion 1222; if the diameter of the cross-section of the core portion 1222 is too large, that is, if the number of turns of the core portion 1222 is too large, the space occupied by the core portion 1222 in the width direction of the battery cell will also increase, which will easily lead to a decrease in the volumetric energy density of the battery cell; at the same time, a large number of turns of the core portion 1222 will also cause great material waste. Therefore, if Figure 3 As shown, in some embodiments, the height of the core portion 1222 of this structure is H2, and the longitudinal section diameter H2 of the core portion 1222 satisfies This arrangement ensures that the core portion 1222 has sufficient size to facilitate winding it using a rotating shaft, and also allows the core portion 1222 to have a moderate proportion in the overall folded structure 122, preventing it from being too small relative to the folded structure 122, thus improving the overall strength and stability of the folded structure 122. Meanwhile, This design avoids the diameter of the longitudinal section of the core portion 1222 being too large, prevents the bottom of the core portion 1222 from contacting the extension portion 121, avoids wear between the two, and helps to ensure the sealing effect of the encapsulation film 1.

[0052] In some embodiments, such as Figure 2 As shown, a receiving groove is punched on one side of the fold line of the encapsulation film 1, and the electrode group is disposed in the receiving groove. The folded edge 1221 is bent upward, and the top of the folded edge 1221 does not exceed the top surface of the battery cell.

[0053] In other embodiments, such as Figure 5 As shown, the encapsulation film 1 has receiving grooves on both sides of the fold line. After the encapsulation film 1 is folded along the fold line, the two receiving grooves are joined together. At this time, the receiving grooves can accommodate a thicker electrode assembly, which is beneficial to increasing the capacity of the cell. The joining of the encapsulation films 1 on both sides of the fold line makes the sealing edge area 12 located in the middle region of the cell thickness direction. At this time, the folded edge 1221 is bent towards the side of the deeper receiving groove to prevent the top of the folded edge structure 122 from exceeding the top surface of the cell, or to prevent the bottom of the folded edge structure 122 from exceeding the bottom surface of the cell.

[0054] Alternatively, in some embodiments, such as Figure 5 As shown, the receiving grooves on both sides of the sealing area 12 have the same depth, and the folded edge 1221 can be bent upwards or downwards.

[0055] In some embodiments, as shown in Figure 3 In some embodiments, as shown in

[0056] According to the embodiments of the present application, in a further aspect, there is also provided a battery pack comprising the above-mentioned battery cell.

[0057] The battery pack has the following advantages. The winding of the winding core portion 1222 of the battery cell is formed by winding, so that the cutting edge of the edge sealing portion 12 is away from the side surface of the packaging body 11, which can effectively prevent the cutting edge from contacting and damaging the side surface of the packaging body 11, thereby ensuring the packaging effect of the packaging film 1 and improving the safety performance of the battery cell and the battery pack. In addition, compared with the 180° bending mode, the bending angle of each layer of the packaging film 1 of the winding core portion 1222 is greatly reduced, and the packaging film 1 at the winding core portion 1222 is smoothly wound. After winding, the layers of the packaging film 1 at the winding core portion 1222 are tightly adhered to each other and effectively tightened, so that the winding core portion 1222 can be stably maintained in the wound state. The winding core portion 1222 comprises at least two layers of the packaging film 1, which can effectively prevent the winding core portion 1222 from loosening and deforming. After winding, the winding core portion 1222 does not need to be heat-pressed and shaped, which can simplify the manufacturing process of the edge folding structure 122 of the battery cell. In addition, the winding core portion 1222 comprising at least two layers of the packaging film 1 can effectively improve the overall strength of the edge folding structure 122, which can effectively improve the packaging strength of the packaging film 1 compared with the single-edge folding and double-edge folding modes, thereby improving the safety performance of the battery cell and the battery pack.

[0058] According to the embodiments of the present application, in a further aspect, there is also provided a manufacturing process of a battery cell for manufacturing the above-mentioned battery cell, comprising the following steps:

[0059] punching the packaging film 1 to form a receiving groove, placing the electrode group in the receiving groove, folding the packaging film 1 and packaging the packaging film 1 outside the electrode group;

[0060] bending the packaging film 1 outside the extension portion 121 towards the side of the thickness direction of the battery cell;

[0061] The encapsulation film 1 is overlapped on the rotating shaft away from one end of the extension part 121, and the rotating shaft is rotated to wind the encapsulation film 1 into a winding core part 1222 in a winding core shape.

[0062] In the related art, the edge sealing area 12 of the battery cell is bent by a tooling operation, and the bending mode of the edge folding structure 180° causes the bending angle of the edge folding part 1221 to be too large after bending, and the edge folding structure 122 has few bending paths, so the edge folding part 1221 is prone to warping and deformation. If the warping and deformation of the edge folding part 1221 is to be improved, the edge folding structure 122 after bending needs to be further heat-pressed and shaped, which causes the forming process of the edge folding structure 122 and the battery cell to be complex, resulting in low production efficiency of the battery cell.

[0063] The manufacturing process of the battery cell of the present application winds and forms the winding core part 1222 by winding, and compared with the bending mode of 180°, the bending angle of each layer of the encapsulation film 1 of the winding core part 1222 is greatly reduced, and the encapsulation film 1 at the winding core part 1222 is smoothly wound, and after winding and forming, each layer of the encapsulation film 1 of the winding core part 1222 is mutually adhered and effectively tightened, so that the winding core part 1222 can be stably maintained in the wound form, and the winding core part 1222 includes at least two turns of the encapsulation film 1, which can effectively prevent the winding core part 1222 from loosening and deforming, and the winding core part 1222 does not need to be heat-pressed and shaped after winding and forming, which can simplify the manufacturing process of the edge folding structure 122 of the battery cell and improve the production efficiency of the battery cell. At the same time, the cutting edge at the end of the edge sealing area 12 is wound inside the winding core part 1222, which can effectively prevent the cutting edge from contacting and scratching the side surface of the encapsulation main body 11.

[0064] When the edge folding structure 122 is formed, the edge folding part 1221 can be first bent and formed, and then the winding core part 1222 is wound and formed; or the winding core part 1222 can be first wound and formed, and then the edge folding part 1221 is bent and formed.

[0065] When the winding core part 1222 is wound, the rotating shaft can be rotated and moved at the same time to wind the encapsulation film 1 layer by layer on the rotating shaft; or the rotating shaft can only be rotated, and the battery cell is moved towards the rotating shaft to wind the encapsulation film 1 layer by layer on the rotating shaft.

[0066] After the winding core part 1222 is wound and formed, the rotating shaft is pulled out from the middle of the winding core part 1222, and the manufacturing and forming of the battery cell are completed.

[0067] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. An electric cell, characterized by, The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. the height of the core portion is H2, ; The application relates to an electrode group and a packaging film thereof.

2. The electric cell of claim 1, wherein, The application relates to an electrode group and a packaging film thereof.

3. The cell of claim 1 or 2, wherein, The application relates to an electrode group and a packaging film thereof.

4. The electric cell of claim 1, wherein, The application relates to an electrode group and a packaging film thereof.

5. A battery pack, characterized by, The application relates to an electrode group and a packaging film thereof.

6. A process for making an electrical cell, characterized by, The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an electrode group and a packaging film thereof. The application relates to an

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