Battery cell shell, battery cell and battery pack for vehicle
By designing a tearable tape on the battery cell shell, the problems of difficult disassembly and low recycling efficiency of existing battery cell shells are solved, and easier disassembly and more efficient recycling are achieved.
Patent Information
- Application Number
- CN202421663548.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The existing battery cell shell is difficult to ensure airtightness when disassembling, and the disassembly process is time-consuming and labor-intensive, which can easily lead to damage to the bare battery cell assembly and contamination of the electrolyte, and operational errors may cause harm to the human body.
A battery cell shell is designed, which includes a cover plate, a shell body and a tearable tape. The tearable tape is welded around the engaging interface to the periphery of the cover plate and the upper edge of the shell body, with a free tail for easy tool clamping and tearing.
Through the design of the tearable belt, the battery cell shell is easier to tear off when disassembly, reducing the difficulty and risk of the disassembly process, improving the battery cell recycling efficiency, and reducing potential damage to the human body.
Smart Images
Figure CN222914955U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power batteries, in particular to a cell case, a cell and a battery pack for a vehicle. Background Art
[0002] With the development of vehicles, especially electric vehicles, power batteries, namely battery packs that can be directly used in vehicles, are widely used. Generally, a battery pack has multiple cells and their accessory components. Each cell includes a cell case (usually made of aluminum material) and a bare cell assembly enclosed in the cell case. Considering environmental protection and cost-effectiveness, waste battery packs can be recycled. For example, first, the cells in the battery pack are taken out, and then the bare cell assemblies in the cells are taken out. To ensure the airtightness of the cell case during normal use, the cover plate of the cell case and the case body (such as formed by stamping) are welded together. When disassembling the cell, the disassembling personnel need to use tools such as knives or pliers to manually cut open the cell case, which is not only time-consuming and laborious but also easily causes damage to the bare cell assembly (such as the wound core therein) and pollution of the electrolyte. In addition, the disassembling personnel are also extremely likely to be scratched due to operating errors, thus causing certain harm to the human body.
[0003] Therefore, manufacturing cells that are easy to recycle has become a challenge. Summary of the Utility Model
[0004] An object of the utility model is to provide an improved cell case, a cell and a battery pack for a vehicle, which is conducive to the recycling of the cell.
[0005] According to one aspect of the utility model, there is provided a cell case, which includes: a cover plate having a periphery; and a case body having an upper edge, the upper edge being aligned with the periphery to form a joint interface; the cell case further includes a tearable tape, the tearable tape is connected to the outer periphery of the periphery and the outer periphery of the upper edge around the joint interface, and the unfolded length of the tearable tape is greater than each of the circumferences of the outer periphery of the periphery and the outer periphery of the upper edge, so that the tearable tape has a free tail in a state of being welded to the outer periphery of the periphery and the outer periphery of the upper edge, and the free tail is configured to be easily clamped by a tool to tear the tearable tape from the outer periphery of the periphery and the outer periphery of the upper edge.
[0006] Optionally, the thickness of the tearable tape is the same as the thickness of the upper edge.
[0007] Optionally, the remaining part of the tearable tape except for the free tail is welded to the outer peripheral surface of the peripheral edge by means of a first weld seam and to the outer peripheral surface of the upper edge by means of a second weld seam. The first weld seam is located on the first longitudinal side of the remaining part of the tearable tape, and the second weld seam is located on the second longitudinal side of the remaining part of the tearable tape opposite to the first longitudinal side. The tearable tape is configured such that when the free tail is clamped by the tool to tear the tearable tape from the outer peripheral surface of the peripheral edge and the outer peripheral surface of the upper edge, the tearable section between the first longitudinal side and the second longitudinal side of the remaining part of the tearable tape breaks from the first longitudinal side and the second longitudinal side.
[0008] Optionally, the thickness of the tearable section is at least partially smaller than the thickness of the first longitudinal side and the thickness of the second longitudinal side; and / or the width of the free tail is equal to the width of the tearable section.
[0009] Optionally, the tearable section includes a first recess and a second recess. The first recess faces the outer peripheral surface of the peripheral edge, is close to the first longitudinal side, and is arranged continuously or discretely along the first longitudinal side. The second recess faces the outer peripheral surface of the upper edge, is close to the second longitudinal side, and is arranged continuously or discretely along the second longitudinal side, so that the thickness of the tearable section at the first recess and the second recess is smaller than the thickness of the first longitudinal side and the thickness of the second longitudinal side, and smaller than the thickness of the remaining part of the tearable section.
[0010] Optionally, the tearable section is asymmetrically arranged in the width direction with respect to the bonding interface.
[0011] Optionally, the size and shape of the outer peripheral surface of the peripheral edge are the same as the size and shape of the outer peripheral surface of the upper edge.
[0012] Optionally, the housing body has a width side and a length side. The free tail is located on the width side or the length side, and the free tail is configured to be closely attached to the width side or the length side without being clamped by the tool.
[0013] According to another aspect of the present invention, there is provided an electric core, which includes: the above-mentioned electric core housing; and a bare electric core assembly, which is enclosed in the electric core housing, and the main surface of the bare electric core assembly is perpendicular to the main surface of the cover plate.
[0014] According to still another aspect of the present invention, there is provided a battery pack for a vehicle. The battery pack has a plurality of the above-mentioned electric cores, and the tearable tapes between adjacent electric cores are spaced apart from each other.
[0015] The cell case, cell, and battery pack for a vehicle provided by the present utility model have a tearable tape. The tearable tape is welded around the joint interface to the outer peripheral surface of the peripheral edge of the cover plate and the outer peripheral surface of the upper edge of the case body, and the tearable tape can be easily torn off from the outer peripheral surface of the peripheral edge of the cover plate and the outer peripheral surface of the upper edge of the case body by a tool. Compared with directly welding the peripheral edge of the cover plate to the upper edge of the case body, the presence of the tearable tape is more conducive to disassembling the cell to recycle the bare cell components in the cell and recycle the cell case itself.
[0016] Other features and advantages of the present utility model will become clear from the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings forming a part of the specification depict embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.
[0018] Figure 1 is a perspective view of a cell according to an embodiment of the present utility model.
[0019] Figure 2 is Figure 1 a perspective exploded view of the cell case of the cell, wherein the bare cell components and the tearable tape of the cell case are removed.
[0020] Figure 3 is a schematic cross-sectional view of the joint interface and the tearable tape of a cell case according to an embodiment of the present utility model.
[0021] Figure 4 is a schematic plan view of the tearable tape of a cell case according to an embodiment of the present utility model.
[0022] Figure 5 is a schematic cross-sectional view of the joint interface and the tearable tape of a cell case according to another embodiment of the present utility model.
[0023] Figure 6 is a schematic cross-sectional view of the joint interface and the tearable tape of a cell case according to still another embodiment of the present utility model.
[0024] Figure 7 is a schematic side view of a battery pack for a vehicle according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, the numerical expressions and values do not limit the scope of the present utility model.
[0026] Well-known technologies and devices to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, such technologies and devices shall be regarded as part of the specification.
[0027] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.
[0028] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof in subsequent figures is not required. The figures are not drawn to scale.
[0029] Referring to Figure 1 and Figure 2 , generally speaking, the battery cell 10 provided by the present utility model includes a battery cell case 12 and a bare battery cell assembly (not shown), and the battery cell case 12 includes a cover plate 14 and a case body 16. The battery cell case 12 is marked with an orthogonal coordinate system, wherein the X direction represents the length direction of the battery cell 10, especially the battery cell case 12, the Y direction represents the width direction of the battery cell 10, especially the battery cell case 12, and the Z direction represents the height direction of the battery cell 10, especially the battery cell case 12.
[0030] The cover plate 14 generally includes a liquid injection hole 18 for injecting electrolyte, a pressure relief valve 20, a positive output terminal 22, and a negative output terminal 24. The cover plate 14 further includes a peripheral edge 25, especially as Figure 3 shown, the peripheral edge 25 has an outer peripheral surface 25a and a lower peripheral surface 25b that extends parallel to the XY plane and is substantially perpendicular to the outer peripheral surface 25a of the peripheral edge 25. Thus, the peripheral edge 25 has a thickness extending in the Z direction. It can be understood that the thickness of the peripheral edge 25 may be different from the thickness of any one of the liquid injection hole 18, the pressure relief valve 20, the positive output terminal 22, and the negative output terminal 24.
[0031] Returning to Figure 2, the housing body 16 generally includes: length sides 26 extending substantially parallel to the XZ plane; width sides 28 extending substantially parallel to the YZ plane, the housing body 16 having a thickness extending perpendicular to the length sides 26 or perpendicular to the width sides 28, for example, approximately 0.4 mm; and an open top 30 and a closed bottom 31 extending substantially parallel to the XY plane. The length sides 26, width sides 28, open top 30 and closed bottom 31 of the housing body 16 together define an inner cavity 35, wherein the length sides 26 define the main surfaces of the housing body 16, and the bare cell assembly is pre-placed in the inner cavity 35 via the open top 30, and the main surface of the bare cell assembly conforms to the main surface of the housing body 16. In the usage state of the cell 10, the bare cell assembly will expand and contract to apply a thrust mainly perpendicular to the main surface of the housing body 16, and the thrust acts most strongly on the central position of the length sides 26 and decreases as it radiates towards the periphery of the length sides 26.
[0032] Continue to refer to Figure 3 , the housing body 16 defines an upper edge 32 in the Z direction, that is, the upper edge 32 is composed of a part of the length sides 26 and a part of the width sides 28, the upper edge 32 has an outer peripheral surface 32a and an upper edge surface 32b extending substantially parallel to the XY plane and perpendicular to the outer peripheral surface 32a of the upper edge 32. In the state where the cell 10 is assembled, the peripheral edge 25 of the cover plate 14 is aligned with the upper edge 32 of the housing body 16, and the lower peripheral surface 25b of the peripheral edge 25 contacts the upper edge surface 32b of the upper edge 32 (but is shown as separated in Figure 3 for facilitating the marking of reference numerals) to form a joint interface 33 (schematically shown by a dashed line in Figure 3 , Figures 5 to 6 ), it can be seen that the upper edge 32 and the joint interface 33 at least partially defined by the upper edge 32 are minimally affected by the above-mentioned thrust. It can be understood that the main surface of the bare cell assembly will be perpendicular to the lower peripheral surface 25b of the cover plate 14, that is, the main surface of the cover plate 14, the positive tab of the bare cell assembly is electrically connected to the positive output terminal 22, and the negative tab of the bare cell assembly is electrically connected to the negative output terminal 24.
[0033] As Figure 1 and Figure 3 shown, the cell housing 12 provided by the present utility model further includes a tearable tape 34, the tearable tape 34 is connected to the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32 around the joint interface 33, and the unfolded length of the tearable tape 34 is greater than each of the circumferences of the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32, so that the tearable tape 34 has a free tail 34a in the state of being welded to the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32 (as Figure 1As shown, the free tail 34a is configured to facilitate gripping by a tool (not shown) to tear off the tearable tape 34 from the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32. For example, the tool can use the free tail 34a as a starting point to wind the tearable tape 34 torn off from the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32. Here, at least the peripheral edge 25 of the cover plate 14, the upper edge 32 of the housing body 16, and the tearable tape 34 are made of an aluminum material. The tearable tape 34 can be integrally formed on one of the peripheral edge 25 of the cover plate 14 and the upper edge 32 of the housing body 16 during the manufacturing process. Then, the tearable tape 34 can be connected to the other of the peripheral edge 25 of the cover plate 14 and the upper edge 32 of the housing body 16 by high-temperature welding by means of, for example, laser welding technology. Optionally, the tearable tape 34 can also be connected to the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32 in any other way. Only by way of example, the tearable tape 34 can also be independent, and the peripheral edge 25 of the cover plate 14 and the tearable tape 34, and the upper edge 32 of the housing body 16 and the tearable tape 34 can be welded by high-temperature welding by means of, for example, laser welding technology.
[0034] It can be understood that the unfolded length of the tearable tape 34 refers to the fully extended unfolded length of the imaginary tearable tape 34 when it has not been connected to the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32, that is, the tearable tape 34 has not been bent to conform to the shapes of the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32.
[0035] For example, the thickness of the tearable tape 34 is the same as the thickness of the upper edge 32, for example, about 0.4 mm. Or rather, there is no very significant difference between the thickness of the upper edge 32 and the thickness of the tearable tape 34. The appropriate thickness of the tearable tape 34 helps the tool to wind the tearable tape 34.
[0036] Optionally, different from welding the cover plate to the housing body by directly welding the joint interface 33, the remaining part of the tearable tape 34 provided by the present utility model except for the free tail 34a will be welded to the outer peripheral surface 25a of the peripheral edge 25 by means of the first weld seam 36 and welded to the outer peripheral surface 32a of the upper edge 32 by means of the second weld seam 38, and the joint interface 33 can not be further processed. As Figure 3As shown, the first weld seam 36 is located on the first longitudinal side 34b of the remaining part of the tear strip 34, and the second weld seam 38 is located on the second longitudinal side 34c of the remaining part of the tear strip 34 that is opposite to the first longitudinal side 34b. That is to say, the first longitudinal side 34b is above the joint interface 33 in the Z direction, and the second longitudinal side 34c is below the joint interface 33 in the Z direction. The tear section 34d of the remaining part of the tear strip 34 between the first longitudinal side 34b and the second longitudinal side 34c is located beside the joint interface 33. When the tear section 34d can be clamped by a tool at the free tail 34a of the tear strip 34 to tear the tear strip 34 from the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32, the tear section 34d can break from the first longitudinal side 34b and the second longitudinal side 34c. That is to say, the tool applies a shearing force perpendicular to the longitudinal section of the tear strip 34, that is, the main surface of the housing body 16, to tear the tear strip 34.
[0037] Optionally, as Figure 4 shown, the width of the free tail 34a of the tear strip 34 in its longitudinal section can be equal to the width of the tear section 34d in its longitudinal section (schematically shown by a dashed line in Figure 4 ) to facilitate tearing of the tear strip 34, especially the tear section 34d, while the first longitudinal side 34b and the second longitudinal side 34c still remain on the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32 respectively.
[0038] Optionally, the thickness of the tear section 34d perpendicular to its longitudinal section is at least partially smaller than the corresponding thickness of the first longitudinal side 34b and the corresponding thickness of the second longitudinal side 34c to facilitate breaking of the tear section 34d from the first longitudinal side 34b and the second longitudinal side 34c, while also ensuring the strength of the tear section 34d to prevent the tear section 34d from breaking by itself. As Figure 5 shown, for example, the tear section 34d includes a first recess 40 and a second recess 42. The first recess 40 faces the outer peripheral surface 25a of the peripheral edge 25, is close to the first longitudinal side 34b and is arranged continuously or discretely along the first longitudinal side 34b. The second recess 42 faces the outer peripheral surface 32a of the upper edge 32, is close to the second longitudinal side 34c and is arranged continuously or discretely along the second longitudinal side 34c, so that the thickness of the tear section 34d at the first recess 40 and the second recess 42 is smaller than the thickness of the first longitudinal side 34b and the second longitudinal side 34c, especially smaller than the thickness of the remaining part of the tear section 34d.
[0039] As Figure 6As shown, optionally, the tearable section 34d is asymmetrically arranged relative to the bonding interface 33 in the width direction of its longitudinal section. For example, the thickness of the peripheral edge 25 may be smaller. In order to ensure the appropriate width of the tearable section 34d, the distance between the bonding interface 33 and the second longitudinal side 34c can be appropriately increased so that the distance between the bonding interface 33 and the second longitudinal side 34c is greater than the distance between the bonding interface 33 and the first longitudinal side 34b.
[0040] Optionally, from Figure 3 , Figures 5 to 6 As can be seen, the size and shape of the outer peripheral surface 25a of the peripheral edge 25 can be the same as those of the outer peripheral surface 32a of the upper edge 32, so that the upper edge 32 of the housing body 16 is aligned with the peripheral edge 25 of the cover plate 14 in the Z direction, and the lower peripheral surface 25b of the peripheral edge 25 contacts the upper edge surface 32b of the upper edge 32 in the Z direction. At the same time, the outer peripheral surface 32a of the upper edge 32 and the outer peripheral surface 25a of the peripheral edge 25 together form a flat outer peripheral surface 32a to facilitate the welding of the tearable tape 34.
[0041] Optionally, the free tail 34a is located on the width side portion 28 of the housing body 16. That is to say, one end of the free tail 34a is connected to the remaining part of the tearable tape 34 welded to the outer peripheral surface 25a of the peripheral edge 25 and the outer peripheral surface 32a of the upper edge 32 at the welding end points of the first weld seam 36 and the second weld seam 38. When the free tail 34a does not need to be clamped by a tool, the free tail 34a can be rotated around the welding end point so that the free tail 34a clings to the width side portion 28 of the housing body 16. When the free tail 34a needs to be clamped by a tool, the free tail 34a can be rotated in the reverse direction around the welding end point so that the free tail 34a protrudes relative to the cover plate 14 and the housing body 16. It can be understood that the free tail 34a can also be located on the length side portion 26 of the housing body 16. In addition, the free tail 34a clinging to the width side portion 28 or the length side portion 26 of the housing body 16 can also be adhered to the width side portion 28 or the length side portion 26 of the housing body 16 by an additional tape with a unique color for easy identification.
[0042] The present utility model also provides a battery pack 11 for a vehicle, such as Figure 7As shown, the battery pack 11 may have a plurality of battery cells 10. For example, in the first case, the battery pack 11 may directly have a plurality of battery cells 10, or, in the second case, the battery pack 11 may directly have a plurality of battery modules, and each battery module directly has a plurality of battery cells 10. In any case, the plurality of battery cells 10 are arranged according to a certain rule, and the adjacent battery cells 10 are separated by means of a spacer (not shown, such as an expansion pad, a frame, etc.) to have a certain gap, and the size of the gap should be greater than at least twice the thickness of the tear tape 34, so that the tear tapes 34 of the adjacent battery cells 10 are separated from each other. The tear tapes 34 of the adjacent battery cells 10 that are separated from each other are beneficial to preventing the adjacent battery cells 10 from interacting with each other by means of the tear tape 34 during the expansion and contraction of the battery cells 10, that is, the bare battery cell assemblies, including the interaction in terms of force and heat. It can be understood that the battery pack 11 that can be directly used in a vehicle should also have a series of accessory components such as an electrical system, a thermal management system, and a battery management system.
[0043] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. A battery cell shell (12), comprising: a cover plate (14) having a peripheral edge (25); and a shell body (16) having an upper edge (32) aligned with the peripheral edge (25) to form a bonding interface (33); It is characterized in that the battery cell shell (12) also includes a tearable tape (34), which is connected to the outer peripheral surface of the periphery (25) and the outer peripheral surface of the upper edge (32) around the joint interface (33), and the unfolded length of the tearable tape (34) is greater than each of the circumference of the outer peripheral surface of the periphery (25) and the circumference of the outer peripheral surface of the upper edge (32), so that the tearable tape (34) has a free tail (34a) when it is welded to the outer peripheral surface of the periphery (25) and the outer peripheral surface of the upper edge (32), and the free tail (34a) is configured to be easy to be clamped by a tool to tear off the tearable tape (34) from the outer peripheral surface of the periphery (25) and the outer peripheral surface of the upper edge (32).
2. The battery cell shell (12) according to claim 1, characterized in that: The thickness of the tearable strip (34) is the same as the thickness of the upper edge (32).
3. The battery cell shell (12) according to claim 1, characterized in that: The remaining portion of the tearable strip (34) except the free tail (34a) is welded to the outer peripheral surface of the peripheral edge (25) by means of a first weld (36) and is welded to the outer peripheral surface of the upper edge (32) by means of a second weld (38), wherein the first weld (36) is located at a first longitudinal side edge (34b) of the remaining portion of the tearable strip (34), and the second weld (38) is located at a second longitudinal side edge (34b) of the remaining portion of the tearable strip (34) opposite to the first longitudinal side edge (34b). Toward the side edge (34c), the tearable tape (34) is configured so that when the free tail (34a) is clamped by the tool to tear off the tearable tape (34) from the outer peripheral surface of the peripheral edge (25) and the outer peripheral surface of the upper edge (32), the tearable section (34d) of the remaining part of the tearable tape (34) between the first longitudinal side edge (34b) and the second longitudinal side edge (34c) is broken from the first longitudinal side edge (34b) and the second longitudinal side edge (34c).
4. The battery cell shell (12) according to claim 3, characterized in that: The thickness of the tearable section (34d) is at least partially smaller than the thickness of the first longitudinal side edge (34b) and the thickness of the second longitudinal side edge (34c); and / or The width of the free tail (34a) is equal to the width of the tearable section (34d).
5. The battery cell shell (12) according to claim 3, characterized in that: The tearable section (34d) includes a first recessed portion (40) and a second recessed portion (42), wherein the first recessed portion (40) faces the outer peripheral surface of the peripheral edge (25), is close to the first longitudinal side edge (34b) and is continuously or discretely arranged along the first longitudinal side edge (34b), and the second recessed portion (42) faces the outer peripheral surface of the upper edge (32), is close to the second longitudinal side edge (34c) and is continuously or discretely arranged along the second longitudinal side edge (34c), so that the thickness of the tearable section (34d) at the first recessed portion (40) and the second recessed portion (42) is less than the thickness of the first longitudinal side edge (34b) and the thickness of the second longitudinal side edge (34c), and is less than the thickness of the remaining part of the tearable section (34d).
6. The battery cell shell (12) according to claim 3, characterized in that: The tearable section (34d) is arranged asymmetrically relative to the bonding interface (33) in the width direction.
7. The battery cell shell (12) according to any one of claims 1 to 6, characterized in that: The size and shape of the outer peripheral surface of the peripheral edge (25) are the same as the size and shape of the outer peripheral surface of the upper edge (32).
8. The battery cell shell (12) according to any one of claims 1 to 6, characterized in that: The shell body (16) has a width side portion (28) and a length side portion (26), the free tail portion (34a) is located on the width side portion (28) or the length side portion (26), and the free tail portion (34a) is configured to be tightly attached to the width side portion (28) or the length side portion (26) without being clamped by the tool.
9. A battery cell (10), characterized in that: The battery cell (10) comprises: A battery cell casing (12) according to any one of claims 1 to 8; and A bare cell assembly is enclosed in the cell shell (12), and the main surface of the bare cell assembly is perpendicular to the main surface of the cover plate (14).
10. A battery pack (11) for a vehicle, characterized in that: The battery pack (11) comprises a plurality of battery cells (10) according to claim 9, and the tearable strips (34) of adjacent battery cells (10) are spaced apart from each other.