Battery, battery module, and battery pack

Abstract

The present application relates to the technical field of batteries, and discloses a battery, a battery module, and a battery pack. The battery of the present application comprises an encapsulation film and an electrode assembly. A recess is formed on at least one side of the symmetry line of the encapsulation film, the distance between the side of the recess facing the symmetry line and the symmetry line is d, and 0 mm≤d≤10 mm. An appropriate value of d can ensure the integrity and sealing performance of the encapsulation film structure. In addition, after hot-press encapsulation of the encapsulation film, the electrode assembly is surrounded by a range between the symmetry line and the edge of the recess, the encapsulation film in an encapsulation region occupies a certain space, and an appropriate value of d allows for the control of the space occupied by the encapsulation region, thereby effectively ensuring the space utilization of the battery and improving the volumetric energy density of the battery. In the structure, the value of d in the battery is appropriate and matches the thickness of the battery, ensuring the integrity and sealing performance of the encapsulation film structure, and facilitating improvement of the space utilization and volumetric energy density of the battery.

Description

Batteries, battery modules and battery packs

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411050246.X, filed on August 1, 2024, entitled "Battery, Battery Module and Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to a battery, a battery module, and a battery pack. Background Technology

[0004] Pouch batteries have advantages such as high energy density, small size, and light weight, resulting in a large market for their application. Pouch batteries mainly consist of tabs, electrode arrays, and a sealing film. The sealing film encapsulates the electrode arrays and tabs, and the sides of the sealing film are heat-pressed to form sealing lines, thus sealing the electrode arrays within the sealing film. However, existing pouch batteries have relatively low space utilization and energy density. Summary of the Invention

[0005] In view of this, this application provides a battery, a battery module, and a battery pack to solve the problems of low space utilization and low energy density of batteries in the prior art.

[0006] In a first aspect, this application provides a battery comprising:

[0007] An encapsulation film, wherein at least one side of the line of symmetry of the encapsulation film has a groove, the distance d from the line of symmetry to the side of the groove facing the line of symmetry is 0mm≤d≤10mm; the depth of the groove is D, 0 <D≤10mm;

[0008] An electrode assembly is disposed within the pit; the encapsulation film is folded along the symmetry line and seals the electrode assembly within the encapsulation film.

[0009] The total thickness of the battery is H, where 0mm < H ≤ 20mm.

[0010] Beneficial Effects: This battery structure, based on the overall battery thickness, controls the distance *d* from the symmetry line to the side of the pit facing the symmetry line. Keeping *d* within a suitable range effectively avoids the situation where, with a thicker battery, a deeper pit is required to accommodate the electrode assembly, resulting in lower strength of the encapsulation film near the pit. If *d* is too small, the distance from the pit edge to the symmetry line is too short, and the impact force during the pitting process is too great, easily breaking the encapsulation film at the symmetry line location, leading to film failure. A moderate *d* value ensures the integrity and sealing of the encapsulation film structure. Simultaneously, after heat-press sealing, the distance from the symmetry line to the pit edge surrounds the electrode assembly. The encapsulation film in this area occupies a certain space; a moderate *d* value controls the space occupied by the encapsulation area, effectively ensuring the battery's space utilization and improving its volumetric energy density. The moderate *d* value of this battery structure, matched to the battery thickness, ensures the integrity and sealing of the encapsulation film structure while also improving the battery's space utilization and volumetric energy density.

[0011] In one optional implementation, 0mm < H ≤ 5mm, and a groove is provided on one side of the symmetry line, 0mm ≤ d ≤ 3mm.

[0012] Beneficial effects: Due to the shallow depth of the pits, the encapsulation film near the pits deforms less during the pit stamping process, which can reduce the distance between the pits and the symmetry line. At this time, after the encapsulation film is folded along the symmetry line, the width of the electrode group exposed outside the encapsulation edge where the symmetry line is located is smaller, so as to reduce the space occupied by the encapsulation edge and improve the energy density of the battery.

[0013] In one optional implementation, 5mm < H ≤ 20mm, and grooves are provided on both sides of the symmetry line, 4mm ≤ d ≤ 10mm.

[0014] Beneficial effects: By setting a groove on each side of the symmetry line, the relatively opposite grooves can effectively reduce the groove depth, reduce the deformation of the encapsulation film at and near the groove location, effectively ensure the strength of the encapsulation film, and guarantee the sealing and protective effect of the encapsulation film after heat-pressing. In this embodiment, since the electrode assembly is relatively thick and the groove depth is relatively deep, in order to avoid deformation of the encapsulation film near the groove during the stamping process, which would significantly weaken the strength of the encapsulation film near the symmetry line, d is made to satisfy 4mm≤d≤10mm. This ensures that the symmetry line and the edge of the groove are kept at an appropriate distance, and at the same time, that the symmetry line is kept at an appropriate distance from the weak area near the groove caused by stamping deformation. At this time, heat-pressing encapsulation of the symmetry line area can ensure the strength of the encapsulation line area on the side of the symmetry line after encapsulation, and guarantee the sealing and isolation effect of the encapsulation film on the side of the symmetry line.

[0015] In one alternative implementation, 6mm ≤ d ≤ 8mm.

[0016] In one optional embodiment, the encapsulation film surrounding the electrode assembly is bent to form a folded edge, the folded edge extending along the thickness direction of the battery, and the height of the folded edge extending along the thickness direction of the battery is h, 3mm < h < 5mm.

[0017] Beneficial effects: The height of the folded edge is moderate, avoiding the folded edge being too small and stagnant. By bending the folded edge with tools, it can also prevent the folded edge from being too high and exceeding the top or bottom surface of the battery. This prevents the folded edge from occupying space outside the battery thickness direction, thereby further improving the battery's space utilization and energy density. At the same time, when the batteries are assembled into battery modules and battery packs, it also facilitates the docking of adjacent batteries, making the adjacent battery joints more compact and improving the volumetric energy density of battery modules and battery packs.

[0018] In one optional embodiment, 5mm < H ≤ 10mm, the depths of the pits on both sides of the symmetry line are different, one of the pits on both sides of the symmetry line has a depth of D1 and the other has a depth of D2, D1 ≥ 5mm, and D2 = H - D1.

[0019] Beneficial effect: Ensures that one pit is deeper and the other is shallower. When bending the edge, bend it towards the pit with the deeper depth, thus effectively preventing the edge from extending beyond the top or bottom surface of the battery.

[0020] In one alternative implementation, 10mm < H ≤ 20mm, and the pits on both sides of the symmetry line have the same depth.

[0021] Beneficial effects: After bending, the folded edge will not exceed the top or bottom surface of the battery, effectively ensuring the battery's space utilization and volumetric energy density. Simultaneously, the symmetrical arrangement of the two grooves ensures uniform pressure on the encapsulation film on both sides of the symmetry line, thereby guaranteeing the strength of the encapsulation film and improving the stability of the overall battery structure, ultimately enhancing battery safety.

[0022] In one optional embodiment, a positive electrode tab and a negative electrode tab are further included, the positive electrode tab and the negative electrode tab being located on the same side of the encapsulation film;

[0023] Alternatively, the positive electrode tab and the negative electrode tab may be located on two sides of the encapsulation film.

[0024] Secondly, this application also provides a battery module, including the battery described in any of the above descriptions. The battery module includes the battery and has the same technical effects as the battery, which will not be elaborated further here.

[0025] Secondly, this application also provides a battery pack, including the aforementioned battery module. The battery pack includes a battery and has the same technical effects as the battery, which will not be described in detail here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of an encapsulation film in a battery according to an embodiment of this application;

[0028] Figure 2 is a side view of a battery according to an embodiment of this application;

[0029] Figure 3 is a schematic diagram of an encapsulation film in a battery according to another embodiment of this application;

[0030] Figure 4 is a side view of another type of battery according to an embodiment of this application;

[0031] Figure 5 is a schematic diagram of a battery according to an embodiment of this application;

[0032] Figure 6 is a schematic diagram of another type of battery according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached diagram: 1. Encapsulation film; 11. Groove; 12. Folded edge; 13. Symmetry line; 2. Positive electrode tab; 3. Negative electrode tab. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] The electrode group of the battery is wrapped with a packaging film 1. The packaging film 1 encapsulates the electrode group and the electrode tab. The side of the packaging film 1 is hot-pressed to form a packaging line to seal the electrode group in the packaging film 1. After the size of the battery is designed, the packaging film 1 is stamped with a corresponding mold to form a pit 11 for accommodating the electrode group on the packaging film 1. Then, the packaging film 1 is folded along the symmetry line 13 in the length direction. After the two folded segments of the packaging film 1 are aligned, the side of the packaging film 1 is heat-sealed. In the related art, the edge distance d of the pit 11 facing the symmetry line 13 in the length direction of the packaging film 1 is not appropriate, and the size of the d value does not match the overall thickness of the battery, resulting in d being too small to effectively encapsulate the electrode group, or the d value being too large, resulting in too much space occupied by the sealing edge after the packaging film 1 is folded and heat-sealed, resulting in low space utilization rate and energy density of the battery.

[0036] The embodiments of the present application will be described below with reference to FIGS. 1 to 6.

[0037] According to an embodiment of the present application, on the one hand, a battery is provided, including a packaging film 1 and an electrode group. Among them, at least one side of the symmetry line 13 of the packaging film 1 is provided with a pit 11. The distance from the side of the pit 11 facing the symmetry line 13 to the symmetry line 13 is d, 0 mm ≤ d ≤ 10 mm; the depth of the pit 11 is D, 0 < D ≤ 10 mm; the electrode group is arranged in the pit 11; the packaging film 1 is folded along the symmetry line 13 and the electrode group is sealed in the packaging film 1; the total thickness of the battery is H, 0 mm < H ≤ 20 mm.

[0038] For the battery with this structure, according to the overall thickness of the battery, the size of the distance d from the side of the pit 11 facing the symmetry line 13 to the symmetry line 13 is controlled, and the d value is controlled within a suitable range, which can effectively avoid that when the overall thickness of the battery is relatively thick, in order to accommodate the electrode group, the required depth of the pit 11 is relatively deep, and the punching depth is relatively deep, resulting in a relatively low strength of the packaging film 1 in the area near the pit 11. If the d value is too small, the distance from the edge of the pit 11 to the symmetry line 13 is too short, and during the punching process, the impact force is relatively large and it is easy to break through the packaging film 1 at the symmetry line 13 position, resulting in the failure of the packaging film 1. When the d value is appropriate, the integrity and tightness of the structure of the packaging film 1 can be ensured; at the same time, after the packaging film 1 is hot-pressed and sealed, the distance from the symmetry line 13 to the edge of the pit 11 surrounds the electrode group. The packaging film 1 in this packaging area will occupy a certain space. When the d value is appropriate, the occupied space of the packaging area can be controlled, effectively ensuring the space utilization rate of the battery and increasing the volume energy density of the battery. The d value of the battery with this structure is appropriate and matches the thickness of the battery, which can ensure the integrity and tightness of the structure of the packaging film 1, and at the same time is beneficial to improving the space utilization rate and volume energy density of the battery.

[0039] During the punching process, under the pressure of the mold, a groove 11 is punched out on the encapsulation film 1 to accommodate the electrode assembly. If the groove 11 is too deep, the encapsulation film 1 will break after its deformation reaches the deformation limit. To avoid the encapsulation film 1 breaking, the depth of the groove 11 should generally be controlled within 10mm.

[0040] Because the encapsulation film 1 is relatively thin, the total thickness of the battery is equivalent to the thickness of the electrode assembly.

[0041] Optionally, in some embodiments, as shown in Figures 1 and 2, the total thickness H of the battery satisfies 0mm < H ≤ 5mm, and a groove 11 is provided on one side of the symmetry line 13. The distance d from the symmetry line 13 to the side of the groove 11 facing the symmetry line 13 satisfies 0mm ≤ d ≤ 3mm. In this embodiment, the overall thickness of the battery is relatively thin, that is, the thickness of the electrode assembly is relatively thin. At this time, the depth of the groove 11 is relatively shallow. It is only necessary to provide the groove 11 on one side of the symmetry line 13 of the encapsulation film 1. At the same time, since the depth of the groove 11 is relatively shallow, the deformation of the encapsulation film 1 near the groove 11 is small during the stamping of the groove 11, which can reduce the distance between the groove 11 and the symmetry line 13. At this time, after the encapsulation film 1 is folded along the symmetry line 13, the width of the electrode assembly exposed outside the encapsulation edge where the symmetry line 13 is located is small, so as to reduce the space occupied by the encapsulation edge and improve the energy density of the battery. At this time, the encapsulation edge does not need to be heat-pressed; only the other three sides of the encapsulation film 1 need to be hydraulically encapsulated.

[0042] Optionally, in this embodiment, the battery further includes a positive electrode tab 2 and a negative electrode tab 3. The positive electrode tab 2 and the negative electrode tab 3 can be disposed on the same side of the battery. For example, as shown in Figure 6, the positive electrode tab 2 and the negative electrode tab 3 are disposed on one side of the battery along its length. In this case, the positions of the positive electrode tab 2 and the negative electrode tab 3 are opposite to the position of the symmetry line 13.

[0043] In other embodiments, as shown in FIG5, the positive electrode tab 2 and the negative electrode tab 3 may also be located on two opposite sides of the battery. In this case, the positive electrode tab 2 and the negative electrode tab 3 are located on two sides in the length direction of the battery, and the side where the symmetry line 13 is located is located on one side in the width direction of the battery.

[0044] Optionally, in other embodiments, as shown in Figures 3 and 4, the total thickness H of the battery satisfies 5mm < H ≤ 20mm, and grooves 11 are provided on both sides of the symmetry line 13. The distance d of the side of the groove 11 facing the symmetry line 13 from the symmetry line 13 satisfies 4mm ≤ d ≤ 10mm. In this embodiment, the battery thickness is relatively thick, that is, the electrode assembly thickness is relatively thick. At this time, the depth of the groove 11 is relatively thick. Therefore, in this embodiment, a groove 11 is provided on each side of the symmetry line 13. The relatively provided single groove 11 can effectively reduce the depth of the groove 11, reduce the deformation of the encapsulation film 1 at the location of the groove 11 and in the area near the groove 11, effectively ensure the strength of the encapsulation film 1, and ensure the sealing and protection effect of the encapsulation film 1 after hot-press encapsulation. In this embodiment, since the electrode assembly is relatively thick and the pit 11 is relatively deep, in order to avoid the encapsulation film 1 near the pit 11 from deforming during the stamping process and causing a significant weakening of the strength of the encapsulation film 1 near the symmetry line 13, d is made to satisfy 4mm≤d≤10mm, so that the symmetry line 13 and the edge of the pit 11 are kept at an appropriate distance. At the same time, the symmetry line 13 is kept at an appropriate distance from the weak area near the pit 11 formed by stamping deformation. At this time, the symmetry line 13 area is subjected to hot-press encapsulation treatment, which can ensure the strength of the encapsulation line area on the side where the symmetry line 13 is located after encapsulation and ensure the sealing and isolation effect of the encapsulation film 1 on the side where the symmetry line 13 is located.

[0045] Optionally, in one embodiment, the distance d between the side of the pit 11 facing the symmetry line 13 and the symmetry line 13 satisfies 6mm≤d≤8mm, so as to further optimize the distance between the symmetry line 13 and the edge of the pit 11. While ensuring the sealing effect on the side where the symmetry line 13 is located, the space occupied by the packaging line on the side where the symmetry line 13 is located can be further reduced, thereby further improving the space utilization and energy density of the battery.

[0046] After the encapsulation film 1 is folded along the symmetry line 13, the encapsulation line on the outer periphery of the electrode assembly is flush with the large surface of the electrode assembly. The encapsulation line is folded to form a folded edge 12. The folded edge 12 is parallel to the thickness direction of the electrode assembly to reduce the space occupied by the encapsulation line, further optimize the battery structure, and improve the space utilization and energy density of the battery.

[0047] As shown in Figures 5 and 6, in this embodiment, the battery can have tabs on the same side or opposite sides. When the tabs are on the same side, both the positive tab 2 and the negative tab 3 are located at one end of the battery's length direction. When the tabs are on opposite sides, the positive tab 2 and the negative tab 3 are located at opposite ends of the battery's length direction.

[0048] The positive electrode tab 2 includes an inner positive electrode tab and an outer positive electrode tab, and the negative electrode tab 3 includes an inner negative electrode tab and an outer negative electrode tab. One end of the inner positive electrode tab is electrically connected to the electrode assembly, and the other end of the inner positive electrode tab is electrically connected to the outer positive electrode tab. Both sides of the outer positive electrode tab in the thickness direction are provided with tab adhesive. During heat sealing with the encapsulation film 1, the tab adhesive bonds and fixes the outer positive electrode tab to the encapsulation film 1, achieving a sealing effect at the outer positive electrode tab. Similarly, one end of the inner negative electrode tab is electrically connected to the electrode assembly, and the other end of the inner negative electrode tab is electrically connected to the outer negative electrode tab. Both sides of the outer negative electrode tab in the thickness direction are provided with tab adhesive. During heat sealing with the encapsulation film 1, the tab adhesive bonds and fixes the outer negative electrode tab to the encapsulation film 1, achieving a sealing effect at the outer negative electrode tab.

[0049] As shown in Figures 2 and 4, the encapsulation line around the electrode assembly is folded to form a folded edge 12. The folded edge 12 extends along the thickness direction of the battery, and its height along the thickness direction is h, where 3mm < h < 5mm. The folded edge 12 can be bent towards the top surface of the battery according to its thickness, or it can be bent towards the bottom surface. The height of the folded edge 12 is moderate, preventing it from being too small and thus requiring bending with tools. It also prevents the folded edge 12 from being too high and exceeding the top or bottom surface of the battery, thus avoiding it occupying space outside the battery's thickness direction. This further improves the battery's space utilization and energy density. Furthermore, when assembling battery modules and battery packs, it facilitates the connection of adjacent batteries, making the battery joints more compact and improving the volumetric energy density of the battery modules and battery packs.

[0050] Optionally, in some embodiments, the total thickness H of the battery satisfies 5mm < H ≤ 10mm, the depths of the pits 11 on both sides of the symmetry line 13 are different, the depth of one pit 11 on both sides of the symmetry line 13 is D1, the depth of the other pit 11 is D2, D1 ≥ 5mm, and D2 = H - D1. Under the premise that H satisfies 5mm < H ≤ 20mm, when H satisfies 5mm < H ≤ 10mm, the thickness of the battery is relatively moderate. If two pits 11 are set and the depth of the two pits 11 is the same, then the depth of each pit 11 is relatively shallow. After the encapsulation film 1 is folded along the symmetry line 13, the encapsulation line on the side where the symmetry line 13 is located is located between the two pits 11, that is, the encapsulation line on the side where the symmetry line 13 is located is located in the middle position in the thickness direction of the battery. At this time, since the depth of the two pits 11 is relatively shallow, that is, in the thickness direction of the battery, the distance between the encapsulation line on the side where the symmetry line 13 is located and the top and bottom surfaces of the battery are relatively small. And the height h of the folded edge 12 satisfies 3mm < h < 5mm. At this time, after the folded edge 12 is bent, it is easy to exceed the top or bottom surface of the battery, resulting in an increase in the space occupied by the folded edge 12. To avoid this problem, when H satisfies 5mm<H≤10mm, D1≥5mm and D2=H-D1, that is, to ensure that one pit 11 is deeper and the other pit 11 is shallower. When the folded edge 12 is bent, it is bent towards the pit 11 on the deeper side of the pit 11, thereby effectively preventing the folded edge 12 from exceeding the top or bottom surface of the battery.

[0051] For example, in one embodiment, the thickness H of the battery is 10mm. In this case, the depth D1 of the first pit is set to 6mm, and the depth D2 of the second pit is set to 4mm. After the encapsulation film 1 is folded in half, the encapsulation line on the outer periphery of the electrode group is bent and the encapsulation line is bent toward the side where the first pit is located to form a folded edge 12. The height h of the folded edge 12 satisfies 3mm < h < 5mm, that is, the height of the folded edge 12 does not exceed 5mm, and the depth D1 is 6mm, which can effectively ensure that the top of the folded edge 12 does not exceed the top or bottom surface of the battery.

[0052] In other embodiments, the total thickness H of the battery satisfies 10mm < H ≤ 20mm, and the depths of the pits 11 on both sides of the symmetry line 13 are the same. In this embodiment, the total thickness of the battery is relatively large, and two pits 11 are provided with the same depth. Each pit 11 is relatively deep. After the encapsulation film 1 is folded along the symmetry line 13, the encapsulation line on the side of the symmetry line 13 is located in the middle position in the thickness direction of the battery. At this time, since the depths of the two pits 11 are relatively deep, that is, in the thickness direction of the battery, the distance from the encapsulation line on the side of the symmetry line 13 to the top and bottom surfaces of the battery is relatively large. The height h of the folded edge 12 satisfies 3mm < h < 5mm. At this time, the folded edge 12 will not exceed the top or bottom surface of the battery after bending, which can effectively ensure the space utilization and volumetric energy density of the battery. At the same time, the two pits 11 are symmetrically arranged, which can ensure that the encapsulation film 1 on both sides of the symmetry line 13 is uniformly compressed, thereby ensuring the strength of the encapsulation film 1, which is beneficial to improving the stability of the encapsulation film 1 and the overall battery structure, and improving the safety performance of the battery. In this embodiment, the tab is located in the middle of the battery thickness direction.

[0053] Optionally, in some embodiments, the battery includes a pouch cell, and the encapsulation film 1 includes an aluminum-plastic film.

[0054] According to an embodiment of this application, another aspect provides a battery module including the battery described above.

[0055] This battery module structure has a moderate d-value that matches the thickness of the battery, which ensures the integrity and sealing of the encapsulation film 1 structure, while also improving the space utilization and volumetric energy density of the battery module.

[0056] According to an embodiment of this application, another aspect provides a battery pack including the battery module described above.

[0057] This battery pack structure has a moderate d-value that matches the thickness of the battery, which ensures the integrity and sealing of the encapsulation film 1 structure, while also improving the space utilization and volumetric energy density of the battery pack.

[0058] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery, characterized by, The battery comprises: a packaging film, at least one side of a symmetry line of the packaging film is provided with a groove, the distance from the side of the groove to the symmetry line is d, 0mm≤d≤10mm; the depth of the groove is D, 0<D≤10mm; a pole group is arranged in the groove; the packaging film is folded along the symmetry line and seals the pole group in the packaging film; the total thickness of the battery is H, 0mm<H≤20mm.

2. The battery of claim 1, wherein, 0mm<H≤5mm, one side of the symmetry line is provided with a groove, 0mm≤d≤3mm.

3. The battery of claim 1, wherein, 5mm<H≤20mm, both sides of the symmetry line are provided with grooves, 4mm≤d≤10mm.

4. The battery of claim 3, wherein, 6mm≤d≤8mm.

5. The battery according to claim 3 or 4, characterized in that, The packaging film at the periphery of the pole group is bent to form a folded edge part, the folded edge part extends along the thickness direction of the battery, the height of the folded edge part extending along the thickness direction of the battery is h, 3mm<h<5mm.

6. The battery of claim 5, wherein, 5mm<H≤10mm, the depths of the grooves on both sides of the symmetry line are different, the depth of one of the grooves on both sides of the symmetry line is D1, the depth of the other groove is D2, D1≥5mm, D2=H-D1.

7. The battery of claim 3 or 4, wherein 10mm<H≤20mm, the depths of the grooves on both sides of the symmetry line are the same.

8. The battery of any one of claims 1 to 4, wherein, The battery further comprises a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are located on the same side edge of the packaging film; or the positive electrode tab and the negative electrode tab are located on two side edges of the packaging film.

9. A battery module, characterized by The battery comprises the battery of any one of claims 1 to 8.

10. A battery pack, characterized by, The battery module comprises the battery of claim 9.

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