Battery cell and battery pack with same

Abstract

The utility model discloses a single battery and a battery pack with the single battery, the single battery comprises a shell, a pole group, an anti-explosion valve and a side plate, the shell defines a mounting space, and openings are arranged at two ends of the shell along the length direction of the single battery; the pole group is arranged in the mounting space, and the outer side of the pole group is coated with an insulating film; the anti-explosion valve is arranged in the mounting space and is positioned on one side of the shell along the width direction of the battery monomers, and an avoiding hole corresponding to the anti-explosion valve is formed in the shell; the side plate is arranged between the insulating film and the anti-explosion valve, a plurality of through holes are formed in the side plate, and the through holes penetrate through the side plate; wherein a concave part is arranged on the side wall of one end, far away from the side plate, of the shell along the width direction of the single battery, and the bottom wall, close to the side plate, of the concave part protrudes towards the side plate. According to the battery monomer disclosed by the utility model, the cracking risk of the battery monomer is relatively low, and the risk of heat spreading between adjacent battery monomers is relatively low.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a battery monomer and a battery pack having the same. Background Art

[0002] In the prior art, when a battery experiences thermal runaway, the side wall of the battery shell is easily cracked under the impact of high-temperature airflow, and there are fewer exhaust channels for the high-temperature airflow. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell with a low risk of cracking and a low risk of heat spread between adjacent battery cells.

[0004] The utility model also provides a battery pack, which includes the above-mentioned battery monomer.

[0005] According to the battery cell of the embodiment of the utility model, the shell comprises a shell, a pole group, an explosion-proof valve and a side plate, the shell defines an installation space, and both ends of the shell along the length direction of the battery cell are provided with open openings; the pole group is arranged in the installation space, and the outer side of the pole group is covered with an insulating film; the explosion-proof valve is arranged in the installation space and is located on one side of the shell along the width direction of the battery cell, and the shell is provided with a avoidance hole corresponding to the explosion-proof valve; the side plate is arranged between the insulating film and the explosion-proof valve, and a plurality of through holes are provided on the side plate, and the through holes penetrate the side plate; wherein, along the width direction of the battery cell, a recessed portion is provided on the side wall of the shell at one end away from the side plate, and the bottom wall of the recessed portion close to the side plate protrudes toward the side plate.

[0006] According to the battery cell of the embodiment of the utility model, the pole group is arranged in the shell, the explosion-proof valve is arranged in the installation space and is located on one side of the shell along the width direction of the battery cell, and the side plate is arranged between the insulating film and the explosion-proof valve. Along the width direction of the battery cell, a concave portion is arranged on the side wall of the shell at one end away from the side plate, and the bottom wall of the concave portion close to the side plate protrudes toward the side plate. The concave portion can increase the strength of the side wall of the shell at one end away from the side plate, greatly reducing the risk of side spray or cracking of the side wall of the shell at one end away from the side plate; and heat and high-temperature airflow can be discharged from the outside of the battery cell from the explosion-proof valve after passing through the exhaust channel formed between the pole group and the inner bottom wall of the side wall of the shell provided with the concave portion, thereby reducing the risk of heat spreading between adjacent battery cells.

[0007] In some embodiments of the present invention, a space-avoiding groove is provided at a position of the side plate corresponding to the explosion-proof valve.

[0008] In some embodiments of the present invention, a clearance gap L1 between the bottom wall of the clearance groove and the explosion-proof valve satisfies: 0.3 mm ≤ L1 ≤ 1 mm.

[0009] In some embodiments of the present invention, the recessed portion extends along the length direction of the battery cell.

[0010] In some embodiments of the present invention, there are multiple recessed portions, and the multiple recessed portions are arranged at intervals along the thickness direction of the battery cell.

[0011] In some embodiments of the present invention, a minimum distance L2 between the recessed portion and an inner wall of a side wall of the housing adjacent to the recessed portion satisfies: 1 mm ≤ L2 ≤ 4 mm.

[0012] In some embodiments of the present invention, a width F of the recessed portion on a side close to the side panel satisfies: 2mm≤F≤10mm; and / or a height H of the recessed portion on a side close to the side panel satisfies: 0.2mm≤H≤0.5mm.

[0013] In some embodiments of the present invention, on a side of the recessed portion close to the side plate, a distance W between two adjacent recessed portions satisfies: 2mm≤W≤15mm.

[0014] In some embodiments of the present invention, along the length direction of the battery cell, a distance L3 between the recessed portion and the open opening satisfies: 8 mm ≤ L3 ≤ 20 mm.

[0015] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell.

[0016] According to the battery pack of the embodiment of the utility model, the pole group is arranged in the shell, the explosion-proof valve is arranged in the installation space and is located on one side of the shell along the width direction of the battery cell, and the side plate is arranged between the insulating film and the explosion-proof valve. Along the width direction of the battery cell, a concave portion is arranged on the side wall of the shell at one end away from the side plate, and the bottom wall of the concave portion close to the side plate protrudes toward the side plate. The concave portion can increase the strength of the side wall of the shell at one end away from the side plate, greatly reducing the risk of side spray or cracking of the side wall of the shell at one end away from the side plate; and can make the heat and high-temperature air flow pass through the exhaust channel formed between the pole group and the inner bottom wall of the side wall of the shell provided with the concave portion and then be discharged from the outside of the battery cell through the explosion-proof valve, reducing the risk of heat spreading between adjacent battery cells.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is an exploded view of a battery cell according to an embodiment of the utility model;

[0020] Figure 2 is a three-dimensional diagram of a battery cell according to an embodiment of the utility model;

[0021] Figure 3 is a three-dimensional view of a battery cell according to an embodiment of the utility model from another angle;

[0022] Figure 4 is a top view of a battery cell according to an embodiment of the utility model;

[0023] Figure 5 is a bottom view of a battery cell according to an embodiment of the utility model;

[0024] Figure 6 is a cross-sectional view of a battery cell according to an embodiment of the utility model;

[0025] Figure 7 is a cross-sectional view of a battery cell according to an embodiment of the utility model at another angle;

[0026] Figure 8 yes Figure 7 The enlarged view of point A in the middle;

[0027] Fig. 9 yes Figure 7 Enlarged view of point B in the middle.

[0028] Reference numerals:

[0029] 100. Battery cell;

[0030] 1. Shell; 11. Installation space; 12. Open mouth; 13. Avoidance hole; 14. Recessed part;

[0031] 2. pole group; 21. insulating film;

[0032] 3. Explosion-proof valve;

[0033] 4. Side panel; 41. Through hole; 42. Air avoidance groove. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Reference below Figure 1-Figure 9 A battery cell 100 according to an embodiment of the present invention is described.

[0038] like Figure 1 As shown, the battery cell 100 according to the embodiment of the present utility model includes a housing 1 , a pole group 2 , an explosion-proof valve 3 and a side plate 4 .

[0039] like Figure 1 and Figure 6 As shown, the housing 1 defines an installation space 11, and the housing 1 is provided with a plurality of holes 11a and 11b along the length direction of the battery cell 100 (such as Figure 1 Both ends of the battery cell 100 (in the direction a shown in the figure) are provided with openings 12, and the components in the battery cell 100 are installed into the installation space 11 through the openings 12, so that the assembly of the battery cell 100 is relatively convenient.

[0040] like Figure 1 and Figure 6 As shown, the electrode group 2 is arranged in the installation space 11, and the outer side of the electrode group 2 is covered with an insulating film 21, which can effectively prevent the electrode group 2 from being corroded by external substances (such as moisture, dust, etc.), keep the electrode group 2 clean and dry, and thus protect the normal operation and service life of the electrode group 2. The insulating film 21 can also prevent the electrolyte from leaking inside the battery cell 100, keep the inside of the battery cell 100 dry and clean, and avoid the performance degradation or safety problems of the battery cell 100 caused by electrolyte leakage.

[0041] like Figure 1 , Figure 3 and Figure 4 As shown, the explosion-proof valve 3 is arranged in the installation space 11 and is located along the width direction of the battery cell 100 (such as Figure 1 c direction as shown), a avoidance hole 13 corresponding to the explosion-proof valve 3 is provided on the shell 1. When the battery cell 100 is in thermal runaway, the relatively high temperature airflow inside the battery cell 100 can rush out of the battery cell 100 from the explosion-proof valve 3, and rush out of the battery cell 100 through the avoidance hole 13 on the shell 1, which can avoid the explosion of the battery cell 100 and the impact of the battery cell 100 on other surrounding components. When the battery cell 100 is in thermal runaway, the explosion-proof valve 3 can facilitate the relatively high temperature airflow inside the battery cell 100 to be discharged from one side of the shell 1 along the width direction of the battery cell 100, so as to achieve rapid exhaust of the battery cell 100, thereby achieving gas-electricity separation of the battery cell 100 and increasing the thermal safety of the battery cell 100.

[0042] like Figure 1 and Fig. 9 As shown, the side plate 4 is disposed between the insulating film 21 and the explosion-proof valve 3. The side plate 4 can support the exhaust and the explosion-proof valve 3. The side plate 4 can increase the strength of the electrode group 2 and the explosion-proof valve 3, so that the electrode group 2 and the explosion-proof valve 3 are not easily damaged, thereby increasing the safety of the battery cell 100. The side plate 4 is provided with a plurality of through holes 41, which penetrate the side plate 4. When the battery cell 100 has thermal runaway, the high-temperature airflow inside the battery cell 100 is discharged from the explosion-proof valve 3 to the outside through the through holes 41, thereby realizing rapid exhaust of the battery cell 100, thereby realizing gas-electricity separation of the battery cell 100, and increasing the thermal safety of the battery cell 100.

[0043] like Figure 2 and Figure 5As shown, along the width direction of the battery cell 100, a concave portion 14 is provided on the side wall of the housing 1 at one end away from the side plate 4, and the bottom wall of the concave portion 14 close to the side plate 4 protrudes toward the side plate 4. The side wall of the electrode group 2 fits with the protruding free end surface of the concave portion 14, and a gap is formed between the electrode group 2 and the inner bottom wall of the side wall of the housing 1 provided with the concave portion 14. The gap can be formed into an exhaust channel, and the concave portion 14 can increase the strength of the side wall of the housing 1 at one end away from the side plate 4, greatly reducing the risk of side spray or cracking of the side wall of the housing 1 at one end away from the side plate 4; heat and high-temperature airflow can be discharged from the outside of the battery cell 100 through the explosion-proof valve 3 after passing through the exhaust channel, reducing the risk of heat spread between adjacent battery cells 100.

[0044] According to the battery cell 100 of the embodiment of the utility model, the pole group 2 is arranged in the shell 1, the explosion-proof valve 3 is arranged in the installation space 11 and is located on one side of the shell 1 along the width direction of the battery cell 100, and the side plate 4 is arranged between the insulating film 21 and the explosion-proof valve 3. Along the width direction of the battery cell 100, a concave portion 14 is arranged on the side wall of the shell 1 at one end away from the side plate 4, and the bottom wall of the concave portion 14 close to the side plate 4 is convex toward the side plate 4. The concave portion 14 can increase the strength of the side wall of the shell 1 at one end away from the side plate 4, greatly reducing the risk of side spray or cracking of the side wall of the shell 1 at one end away from the side plate 4; and heat and high-temperature air flow can be discharged from the outside of the battery cell 100 through the explosion-proof valve 3 after passing through the exhaust channel formed between the pole group 2 and the inner bottom wall of the side wall of the shell 1 provided with the concave portion 14, thereby reducing the risk of heat spreading between adjacent battery cells 100.

[0045] In some embodiments of the present invention, Figure 1 and Fig. 9 As shown, a side plate 4 is provided with an air avoidance groove 42 at a position corresponding to the explosion-proof valve 3. Appropriate air avoidance can ensure a relatively stable environment inside the battery cell 100, reduce fluctuations in parameters such as temperature and pressure, and thus facilitate stable operation and extended life of the battery cell 100. The air avoidance groove 42 can also reduce physical contact between the side plate 4 and the explosion-proof valve 3 caused by external factors such as vibration and impact, and prevent the explosion-proof valve 3 from being mechanically damaged.

[0046] Further, the clearance gap L1 between the bottom wall of the air-avoiding groove 42 and the explosion-proof valve 3 satisfies: 0.3mm≤L1≤1mm. It is understandable that the clearance gap L1 between the bottom wall of the air-avoiding groove 42 and the explosion-proof valve 3 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm. The clearance gap L1 between the bottom wall of the air-avoiding groove 42 and the explosion-proof valve 3 is not less than 0.3mm, which can ensure that there is appropriate air-avoidance between the explosion-proof valve 3 and the bottom wall of the air-avoiding groove 42, which can ensure that the environment inside the battery cell 100 is relatively stable, reduce the fluctuation of parameters such as temperature and pressure, and thus facilitate the stable operation and life extension of the battery cell 100. The clearance gap L1 between the bottom wall of the air-avoiding groove 42 and the explosion-proof valve 3 is not greater than 1mm, which can avoid the space occupied by the air-avoidance being large, and can avoid the battery cell 100 from being large in size.

[0047] In some embodiments of the present invention, Figure 5 , Figure 7 and Figure 8 As shown, the recessed portion 14 extends along the length direction of the battery cell 100, so that the exhaust channel formed between the pole group 2 and the inner bottom wall of the side wall of the shell 1 provided with the recessed portion 14 extends along the length direction of the battery cell 100. The length of the exhaust channel is relatively long. When thermal runaway occurs in the battery cell 100, the high-temperature airflow can flow in the exhaust channel and the flow distance is relatively long. When thermal runaway occurs at any position in the length direction of the battery cell 100, the high-temperature airflow can flow into the exhaust channel along the length direction of the battery cell 100. The high-temperature airflow can rush out of the battery cell 100 through the explosion-proof valve 3, thereby reducing the risk of heat spread between adjacent battery cells 100.

[0048] Furthermore, if Figure 5 and Figure 8 As shown, there are multiple recessed portions 14, and the multiple recessed portions 14 are arranged along the thickness direction of the battery cell 100 (eg Figure 1 b direction as shown), so that a plurality of exhaust channels can be formed between the electrode group 2 and the inner bottom wall of the side wall of the shell 1 having the recessed portion 14. The number of exhaust channels is large. When thermal runaway occurs in the battery cell 100, the high-temperature airflow can flow in the exhaust channels, and there are more accessible exhaust channels. When thermal runaway occurs at multiple locations inside the battery cell 100, the high-temperature airflow can flow into the exhaust channels, and the high-temperature airflow can rush out of the battery cell 100 through the explosion-proof valve 3, thereby reducing the risk of heat spread between adjacent battery cells 100.

[0049] In some embodiments of the present invention, the minimum distance L2 between the recessed portion 14 and the inner wall of the side wall of the housing 1 adjacent to the recessed portion 14 satisfies: 1mm≤L2≤4mm. It is understandable that the minimum distance L2 between the recessed portion 14 and the inner wall of the side wall of the housing 1 adjacent to the recessed portion 14 may be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm. The minimum distance L2 between the recessed portion 14 and the inner wall of the side wall of the shell 1 and the adjacent side wall of the recessed portion 14 is not less than 1 mm, which can avoid the distance between the recessed portion 14 and the inner wall of the side wall of the shell 1 and the adjacent side wall of the recessed portion 14 being too small, and can avoid the width of the exhaust channel being too small, thereby ensuring the exhaust effect of the exhaust channel; the minimum distance L2 between the recessed portion 14 and the inner wall of the side wall of the shell 1 and the adjacent side wall of the recessed portion 14 is not greater than 4 mm, which can avoid the minimum distance between the recessed portion 14 and the inner wall of the side wall of the shell 1 and the adjacent side wall of the recessed portion 14 being too large, and can avoid stress concentration here, thereby increasing the reliability of the shell 1 of the battery cell 100.

[0050] In some embodiments of the utility model, the width F of the recessed portion 14 on the side close to the side plate 4 satisfies: 2mm≤F≤10mm. It is understandable that the width F of the recessed portion 14 on the side close to the side plate 4 may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm. The width F of the recessed portion 14 on the side close to the side plate 4 is not less than 2mm, so that there is a certain gap between two adjacent exhaust channels, and the recessed portion 14 has a better supporting effect on the pole group 2; the width F of the recessed portion 14 on the side close to the side plate 4 is not greater than 10mm, which can increase the layout space of the exhaust channels and increase the number of exhaust channels.

[0051] In some embodiments of the present invention, the height H of the recessed portion 14 on the side close to the side plate 4 satisfies: 0.2mm≤H≤0.5mm. It is understandable that the height H of the recessed portion 14 on the side close to the side plate 4 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm. The height H of the recessed portion 14 on the side close to the side plate 4 is not less than 0.2mm, which can ensure that the exhaust channel has a certain thickness and a certain exhaust effect; the height H of the recessed portion 14 on the side close to the side plate 4 is not greater than 0.5mm, which can avoid the recessed portion 14 occupying a large space of the battery cell 100, avoid the battery cell 100 being large in size, and facilitate the assembly of the battery cell 100 with other components.

[0052] In some embodiments of the utility model, on the side of the recessed portion 14 close to the side plate 4, the distance W between two adjacent recessed portions 14 satisfies: 2mm≤W≤15mm. It can be understood that on the side of the recessed portion 14 close to the side plate 4, the distance W between two adjacent recessed portions 14 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm. The distance W between two adjacent recessed portions 14 is not less than 2mm, that is, the width of the exhaust channel is not greater than 2mm, which can avoid the width of the exhaust channel being too small and ensure the exhaust effect of the exhaust channel; the distance W between two adjacent recessed portions 14 is not greater than 15mm, which can avoid stress concentration between two adjacent recessed portions 14 and increase the reliability of the shell 1 of the battery cell 100.

[0053] In some embodiments of the present invention, along the length direction of the battery cell 100, the distance L3 between the recessed portion 14 and the open opening 12 satisfies: 8mm≤L3≤20mm. It is understood that along the length direction of the battery cell 100, the distance L3 between the recessed portion 14 and the open opening 12 may be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm. The distance L3 between the recessed portion 14 and the open opening 12 is not less than 8 mm, so that the recessed portion 14 and the open opening 12 have a certain distance, thereby avoiding the recessed portion 14 from breaking at the open opening 12; the distance L3 between the recessed portion 14 and the open opening 12 is not greater than 20 mm, thereby avoiding the length of the recessed portion 14 being too short, thereby ensuring that the exhaust passage is too long. When thermal runaway occurs in the battery cell 100, the high-temperature airflow can flow in the exhaust passage, and the flow distance is relatively long. Along the length direction of the battery cell 100, when thermal runaway occurs at any position in the length direction of the battery cell 100, the high-temperature airflow can flow into the exhaust passage, and the high-temperature airflow can rush out of the battery cell 100 through the explosion-proof valve 3, thereby reducing the risk of heat spread between adjacent battery cells 100.

[0054] The battery pack according to the embodiment of the present invention includes the above-mentioned battery cell 100 .

[0055] According to the battery pack of the embodiment of the utility model, the pole group 2 is arranged in the shell 1, the explosion-proof valve 3 is arranged in the installation space 11 and is located on one side of the shell 1 along the width direction of the battery cell 100, and the side plate 4 is arranged between the insulating film 21 and the explosion-proof valve 3. Along the width direction of the battery cell 100, a concave portion 14 is arranged on the side wall of the shell 1 at one end away from the side plate 4, and the bottom wall of the concave portion 14 close to the side plate 4 is convex toward the side plate 4. The concave portion 14 can increase the strength of the side wall of the shell 1 at one end away from the side plate 4, greatly reducing the risk of side spray or cracking of the side wall of the shell 1 at one end away from the side plate 4; and heat and high-temperature air flow can be discharged from the outside of the battery cell 100 through the explosion-proof valve 3 after passing through the exhaust channel formed between the pole group 2 and the inner bottom wall of the side wall of the shell 1 provided with the concave portion 14, thereby reducing the risk of heat spreading between adjacent battery cells 100.

[0056] Other structures and operations of the battery cell 100 and the battery having the same according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A shell, the shell defining an installation space, and the shell having openings at both ends along the length direction of the battery cell; A pole group, the pole group is arranged in the installation space, and the outer side of the pole group is covered with an insulating film; An explosion-proof valve is arranged in the installation space and located on one side of the housing along the width direction of the battery cell, and the housing is provided with an avoidance hole corresponding to the explosion-proof valve; A side plate, the side plate is arranged between the insulating film and the explosion-proof valve, the side plate is provided with a plurality of through holes, and the through holes penetrate the side plate; Wherein, along the width direction of the battery cell, a concave portion is provided on the side wall of the shell at one end away from the side plate, and a bottom wall of the concave portion close to the side plate protrudes toward the side plate.

2. The battery cell according to claim 1, characterized in that: A clearance groove is provided at a position of the side plate corresponding to the explosion-proof valve.

3. The battery cell according to claim 2, characterized in that: The air avoidance gap L1 between the bottom wall of the air avoidance groove and the explosion-proof valve satisfies: 0.3 mm ≤ L1 ≤ 1 mm.

4. The battery cell according to claim 1, characterized in that: The recessed portion extends along a length direction of the battery cell.

5. The battery cell according to claim 4, characterized in that: There are a plurality of the concave portions, and the plurality of concave portions are arranged at intervals along the thickness direction of the battery cell.

6. The battery cell according to claim 1, characterized in that: A minimum distance L2 between the recessed portion and an inner wall of a side wall of the housing adjacent to the recessed portion satisfies: 1 mm ≤ L2 ≤ 4 mm.

7. The battery cell according to claim 1, characterized in that: The width F of the concave portion on one side close to the side plate satisfies: 2mm≤F≤10mm; And / or, a height H of the concave portion on a side close to the side plate satisfies: 0.2 mm ≤ H ≤ 0.5 mm.

8. The battery cell according to claim 1, characterized in that: On a side of the concave portion close to the side plate, a distance W between two adjacent concave portions satisfies: 2 mm ≤ W ≤ 15 mm.

9. The battery cell according to claim 1, characterized in that: Along the length direction of the battery cell, a distance L3 between the recessed portion and the open opening satisfies: 8 mm ≤ L3 ≤ 20 mm.

10. A battery pack, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 9.

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