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 cover plate, a pole group and an insulating backing plate, the shell defines a mounting space, and two ends of the shell along the length direction of the single battery are respectively provided with an opening; the pole group is arranged in the mounting space, and a negative tab is arranged on the pole group; the two cover plates respectively cover the two openings, one cover plate is provided with a negative pole, the negative pole is electrically connected with the negative lug, one side, close to the pole group, of the cover plate is provided with lower plastic, and the lower plastic extends along the length direction of the battery monomer; the insulating backing plate is arranged between the pole group and the lower plastic, an assembly hole is formed in the insulating backing plate, and the negative tab penetrates through the assembly hole. According to the single battery disclosed by the utility model, the pressure from the pole group in the single battery directly acts on the insulating backing plate, so that the risk of damage to the pole group is reduced, and the space for movement of the pole group is reduced.

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, the plastic structure under the cover is mostly used to fix the electrode group inside the battery cell. The fixation of the electrode group inside the battery cell is relatively insufficient, and the electrode group is prone to movement, resulting in the electrical connection inside the battery cell being easily broken. 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, in which the pressure from the pole group directly acts on the insulating pad, reducing the risk of pole group damage and reducing the space for pole group movement.

[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, it includes a shell, a cover plate, a pole group and an insulating pad, 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 pole group is provided with a negative pole ear; two cover plates are respectively covered on the two open openings, one of the cover plates is provided with a negative pole column, and the negative pole column is electrically connected to the negative pole ear, and a lower plastic is provided on the side of the cover plate close to the pole group, and the lower plastic extends along the length direction of the battery cell; the insulating pad is arranged between the pole group and the lower plastic, and an assembly hole is provided on the insulating pad, and the negative pole ear is inserted into the assembly hole.

[0006] According to the battery cell of the embodiment of the utility model, by arranging the insulating pad in the accommodating cavity and between the electrode group and the negative electrode column, when the cover plate is installed at the open mouth of the shell, the electrode group contacts the insulating pad, and the pressure from the electrode group directly acts on the insulating pad. The force on the insulating pad is relatively uniform, reducing the risk of damage to the electrode group, and can better fix the electrode group and reduce the space for the electrode group to move. The negative electrode ear is inserted into the assembly hole of the insulating pad, which is convenient for realizing the electrical connection between the electrode group and the negative electrode column, and the connection process between the negative electrode ear and the negative electrode column is relatively simple, which can realize the automatic assembly of the negative electrode ear and the negative electrode column.

[0007] In some embodiments of the present invention, the battery cell further includes an explosion-proof valve, which is disposed in the installation space and located on one side of the shell along the width direction of the battery cell, and the shell is provided with an avoidance hole corresponding to the explosion-proof valve.

[0008] In some embodiments of the present invention, the outer side of the electrode group is covered with an insulating film, and the battery cell further includes a side plate, and the side plate is arranged between the insulating film and the explosion-proof valve.

[0009] In some embodiments of the present invention, a plurality of through holes are provided on the side plate, and the through holes penetrate through the side plate.

[0010] In some embodiments of the present invention, the plurality of through holes are arranged in multiple rows and columns on the side plate.

[0011] 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.

[0012] In some embodiments of the present invention, a dimension L of the insulating pad in a thickness direction satisfies: 0.2mm≤L≤0.3mm.

[0013] In some embodiments of the present invention, an exhaust gap is provided between the insulating pad and the edge of the lower plastic, and along the width direction of the battery cell, the exhaust gap W between the insulating pad and the edge of the lower plastic satisfies: 0.5mm≤W≤3mm.

[0014] In some embodiments of the present invention, an exhaust gap is provided between the insulating pad and the edge of the lower plastic, and along the thickness direction of the battery cell, the exhaust gap H between the insulating pad and the edge of the lower plastic satisfies: 0.5mm≤H≤3mm.

[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, by arranging the insulating pad in the accommodating cavity and between the electrode group and the negative electrode column, when the cover plate is installed at the open mouth of the shell, the electrode group contacts the insulating pad, and the pressure from the electrode group directly acts on the insulating pad. The force on the insulating pad is relatively uniform, reducing the risk of damage to the electrode group, and can better fix the electrode group and reduce the space for the electrode group to move. The negative electrode ear is inserted into the assembly hole of the insulating pad, which is convenient for realizing the electrical connection between the electrode group and the negative electrode column, and the connection process between the negative electrode ear and the negative electrode column is relatively simple, which can realize the automatic assembly of the negative electrode ear and the negative electrode column.

[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 side view of a battery cell according to an embodiment of the utility model;

[0021] Figure 3 is a cross-sectional view of a battery cell according to an embodiment of the utility model;

[0022] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5 is a rear view of a cover plate and an insulating pad of a battery cell according to an embodiment of the utility model;

[0024] Figure 6 is a side view of a cover plate and an insulating pad of a battery cell according to an embodiment of the utility model;

[0025] Figure 7 is a three-dimensional diagram of a side plate of a battery cell according to an embodiment of the utility model;

[0026] Figure 8 is a three-dimensional diagram of an insulating pad of a battery cell according to an embodiment of the utility model;

[0027] Fig. 9 It is a side view of an insulating pad of a battery cell according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] 100. Battery cell;

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

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

[0032] 3. Explosion-proof valve;

[0033] 4. Side plate; 41. Through hole; 42. Air avoidance groove; 43. Exhaust hole;

[0034] 5. Cover plate; 51. Negative pole; 52. Lower plastic;

[0035] 6. Insulating pad; 61. Assembly hole. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Reference below Figure 1-Figure 9 A battery cell 100 according to an embodiment of the present invention is described.

[0040] like Figure 1 As shown, the battery cell 100 according to the embodiment of the present utility model includes a housing 1 , an electrode group 2 , a cover plate 5 and an insulating pad 6 .

[0041] like Figure 1 and Figure 4 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 length direction shown in the figure) are provided with openings 12, and the components in the battery cell 100 are installed in the installation space 11 through the openings 12, so that the assembly of the battery cell 100 is relatively convenient.

[0042] like Figure 1 and Figure 2 As shown, the two cover plates 5 are respectively covered on the two openings 12 to block the openings 12 at both ends of the length direction of the shell 1, which can protect the internal structure of the battery cell 100, prevent the battery cell 100 from being hit and damaged by external forces, and ensure the safety and reliability of the battery cell 100; the cover plate 5 can also prevent the leakage of chemical substances inside the battery cell 100 and avoid the influence of the external environment on the battery cell 100.

[0043] like Figure 1 , Figure 3 and Figure 4 As shown, a negative electrode column 51 is disposed on one of the cover plates 5 , and the negative electrode column 51 is mainly used to connect the battery cell 100 and an external circuit to ensure that the battery cell 100 can perform normal charge and discharge operations.

[0044] The electrode group 2 is arranged in the installation space 11, and a negative electrode ear is provided on the electrode group 2, and the negative electrode ear is electrically connected to the negative electrode column 51. The negative electrode column 51 is the negative terminal of the battery cell 100, and the negative electrode column 51 is connected to the negative electrode active material inside the battery cell 100 through the negative electrode ear. During the discharge process, the negative electrode column 51 receives electrons, and forms a current with the electrons released by the positive electrode column, which is supplied to the external circuit. During the charging process, the negative electrode column 51 releases electrons, so that a charging reaction occurs inside the battery cell 100. In addition, a positive electrode column is also provided on the cover plate 5. The positive electrode column is the positive terminal of the battery cell 100, and the positive electrode column is connected to the positive electrode active material inside the battery through the positive electrode ear. During the discharge process, the positive electrode column releases electrons and transmits electrical energy to the electrical device through the external circuit. During the charging process, the positive electrode column receives electrons transmitted from the external power supply, so that a charging reaction occurs inside the battery cell 100.

[0045] A lower plastic 52 is provided on one side of the cover plate 5 close to the electrode group 2. The lower plastic 52 extends along the length direction of the battery cell 100. The lower plastic 52 can fix the negative electrode column 51 to prevent the negative electrode column 51 from loosening or falling off when the battery cell 100 moves or vibrates. The lower plastic 52 also has a dustproof function, which can effectively prevent dust and other impurities from entering the battery cell 100 and protect the battery cell 100 from contamination. At the same time, the lower plastic 52 also plays an insulating role, preventing a short circuit from occurring when the top cover contacts other metal materials inside the battery cell 100, further ensuring the safety of the battery cell 100.

[0046] like Figure 1 and Figure 4 As shown, the insulating pad 6 is disposed between the pole group 2 and the lower plastic 52. When the cover plate 5 is installed at the open opening 12 of the housing 1, the pole group 2 contacts the insulating pad 6. The pressure from the pole group 2 directly acts on the insulating pad 6. The force on the insulating pad 6 is relatively uniform, which reduces the risk of damage to the pole group 2, can better fix the pole group 2, and reduce the space for the pole group 2 to move. Figure 5 and Figure 8 As shown, an assembly hole 61 is provided on the insulating pad 6, and the negative electrode ear is inserted into the assembly hole 61, which is convenient for realizing the electrical connection between the electrode group 2 and the negative electrode column 51, and the connection process between the negative electrode ear and the negative electrode column 51 is relatively simple, and the automatic assembly of the negative electrode ear and the negative electrode column 51 can be realized.

[0047] According to the battery cell 100 of the embodiment of the utility model, by arranging the insulating pad 6 in the accommodating cavity and between the electrode group 2 and the negative electrode column 51, when the cover plate 5 is installed at the open mouth 12 of the shell 1, the electrode group 2 contacts the insulating pad 6, and the pressure from the electrode group 2 directly acts on the insulating pad 6. The force on the insulating pad 6 is relatively uniform, reducing the risk of damage to the electrode group 2, and can better fix the electrode group 2 and reduce the space for the electrode group 2 to move. The negative electrode ear is inserted into the assembly hole 61 of the insulating pad 6, which is convenient for realizing the electrical connection between the electrode group 2 and the negative electrode column 51, and the connection process between the negative electrode ear and the negative electrode column 51 is relatively simple, which can realize the automatic assembly of the negative electrode ear and the negative electrode column 51.

[0048] In some embodiments of the present invention, Figure 1 and Figure 4 As shown, the battery cell 100 further includes an explosion-proof valve 3, which is disposed in the installation space 11 and is located along the width direction of the battery cell 100 (eg, Figure 1 On one side of the housing 1 (in the width direction shown), a avoidance hole 13 corresponding to the explosion-proof valve 3 is provided on the housing 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 housing 1, which can prevent the battery cell 100 from exploding and can prevent the battery cell 100 from affecting 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 housing 1 along the width direction of the battery cell 100, so as to realize the rapid exhaust of the battery cell 100, thereby realizing the gas-electric separation of the battery cell 100 and increasing the thermal safety of the battery cell 100.

[0049] Furthermore, if Figure 1 and Figure 4As shown, the outer side of the pole group 2 is coated with an insulating film 21, which can effectively prevent the pole group 2 from being corroded by external substances (such as moisture, dust, etc.), keep the pole group 2 clean and dry, and thus protect the normal operation and service life of the pole 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. The battery cell 100 also includes a side plate 4, which is arranged between the insulating film 21 and the explosion-proof valve 3. The side plate 4 can support the explosion-proof valve 3. The side plate 4 can increase the strength of the pole group 2 and the explosion-proof valve 3, so that the pole group 2 and the explosion-proof valve 3 are not easily damaged, thereby increasing the safety of the battery cell 100.

[0050] Furthermore, if Figure 1 and Figure 7 As shown, the side plate 4 is provided with a plurality of through holes 41, and the through holes 41 penetrate the side plate 4. When the battery cell 100 has thermal runaway, the relatively high temperature airflow inside the battery cell 100 is discharged outward from the explosion-proof valve 3 through the through holes 41, so as to realize the rapid exhaust of the battery cell 100, thereby realizing the gas-electricity separation of the battery cell 100 and increasing the thermal safety of the battery cell 100.

[0051] In some embodiments of the present invention, Figure 1 and Figure 7 As shown, a plurality of through holes 41 are arranged in multiple rows and columns on the side plate 4 . The plurality of through holes 41 provided on the side plate 4 can reduce the weight of the side plate 4 , thereby reducing the weight of the battery cell 100 , thereby achieving lightweighting of the battery cell 100 .

[0052] In some embodiments of the present invention, Figure 1 and Figure 7 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.

[0053] like Figure 1 and Figure 7 As shown, a plurality of exhaust holes 43 are provided on the bottom wall of the air-avoiding groove 42, and a plurality of exhaust holes 43 are provided along the thickness direction of the side plate 4 (such as Figure 1In the width direction shown in the figure, multiple exhaust holes 43 all penetrate the bottom wall of the air avoidance groove 42, and multiple exhaust holes 43 are arranged in multiple rows and columns on the bottom wall of the air avoidance groove 42. When thermal runaway occurs inside the battery cell 100, it is convenient for the high-temperature airflow in the battery cell 100 to flow from the exhaust holes 43 to the explosion-proof valve 3, and it is convenient for the high-temperature airflow to rush out of the battery cell 100 from the explosion-proof valve 3, so as to realize the rapid exhaust of the battery cell 100, thereby realizing the gas-electricity separation of the battery cell 100 and increasing the thermal safety of the battery cell 100.

[0054] In some embodiments of the present invention, Figure 6 and Fig. 9 As shown, the thickness direction of the insulating pad 6 (such as Figure 1 The dimension L in the length direction (as shown) satisfies: 0.2mm≤L≤0.3mm. It can be understood that the dimension L in the thickness direction of the insulating pad 6 can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm or 0.3mm. The dimension L in the thickness direction of the insulating pad 6 is not less than 0.2mm, which can ensure the strength of the insulating pad 6 and avoid the insulating pad 6 from breaking and deforming; the dimension L in the thickness direction of the insulating pad 6 is not greater than 0.3mm, which can avoid the insulating pad 6 from being too large in size, avoid the battery cell 100 from being too large in size, and reduce the volume of the battery cell 100.

[0055] In some embodiments of the present invention, Figure 5 As shown, an air gap is provided between the insulating pad 6 and the edge of the lower plastic 52. Along the width direction of the battery cell 100, the air gap W between the insulating pad 6 and the edge of the lower plastic 52 satisfies: 0.5mm≤W≤3mm. It is understandable that the air gap W between the insulating pad 6 and the edge of the lower plastic 52 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm. The exhaust gap W between the insulating pad 6 and the edge of the lower plastic 52 is not less than 0.5mm, which can ensure the exhaust effect of the exhaust gap W. When thermal runaway occurs inside the battery cell 100, the gas on the side where the negative electrode 51 is located can be gathered to the explosion-proof valve 3 along the exhaust gap, which is convenient for the high-temperature airflow to rush out of the battery cell 100 from the explosion-proof valve 3, 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; the exhaust gap W between the insulating pad 6 and the edge of the lower plastic 52 is not greater than 3mm, which can avoid the exhaust gap W between the insulating pad 6 and the edge of the lower plastic 52 from being too large, avoid the battery cell 100 from being too large, and reduce the volume of the battery cell 100.

[0056] In some embodiments of the present invention, Figure 5 As shown, an air venting gap is provided between the insulating pad 6 and the edge of the lower plastic 52, along the thickness direction of the battery cell 100 (eg Figure 1 The venting gap H between the insulating pad 6 and the edge of the lower plastic 52 satisfies: 0.5 mm ≤ H ≤ 3 mm. It is understood that the venting gap H between the insulating pad 6 and the edge of the lower plastic 52 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm. The exhaust gap H between the insulating pad 6 and the edge of the lower plastic 52 is not less than 0.5 mm, which can ensure the exhaust effect of the exhaust gap H. When thermal runaway occurs inside the battery cell 100, the gas on the side where the negative electrode 51 is located can be gathered along the exhaust gap to the explosion-proof valve 3, which is convenient for the high-temperature airflow to rush out of the battery cell 100 from the explosion-proof valve 3, 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; the exhaust gap H between the insulating pad 6 and the edge of the lower plastic 52 is not greater than 3 mm, which can avoid the exhaust gap H between the insulating pad 6 and the edge of the lower plastic 52 from being too large, avoid the battery cell 100 from being too large, and reduce the volume of the battery cell 100.

[0057] The battery pack according to the embodiment of the present invention includes the above-mentioned battery cell 100 .

[0058] According to the battery pack of the embodiment of the utility model, by arranging the insulating pad 6 in the accommodating cavity and between the electrode group 2 and the negative electrode column 51, when the cover plate 5 is installed at the open mouth 12 of the shell 1, the electrode group 2 contacts the insulating pad 6, and the pressure from the electrode group 2 directly acts on the insulating pad 6. The force on the insulating pad 6 is relatively uniform, reducing the risk of damage to the electrode group 2, and can better fix the electrode group 2 and reduce the space for the electrode group 2 to move. The negative electrode ear is inserted into the assembly hole 61 of the insulating pad 6, which is convenient for realizing the electrical connection between the electrode group 2 and the negative electrode column 51, and the connection process between the negative electrode ear and the negative electrode column 51 is relatively simple, which can realize the automatic assembly of the negative electrode ear and the negative electrode column 51.

[0059] Other structures and operations of the battery cell 100 and the battery pack 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.

[0060] 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.

[0061] 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 a negative pole ear is provided on the pole group; A cover plate, wherein the two cover plates are respectively covered on the two open openings, wherein a negative electrode column is provided on one of the cover plates, and the negative electrode column is electrically connected to the negative electrode ear, and a lower plastic is provided on one side of the cover plate close to the electrode group, and the lower plastic extends along the length direction of the battery cell; An insulating pad is provided between the electrode group and the lower plastic, and an assembly hole is provided on the insulating pad, and the negative electrode ear is inserted into the assembly hole.

2. The battery cell according to claim 1, characterized in that: Also includes: An explosion-proof valve is arranged in the installation space and located on one side of the shell along the width direction of the battery cell, and an avoidance hole corresponding to the explosion-proof valve is provided on the shell.

3. The battery cell according to claim 2, characterized in that: The outer side of the electrode group is coated with an insulating film, and the battery cell further comprises: A side plate is arranged between the insulating film and the explosion-proof valve.

4. The battery cell according to claim 3, characterized in that: The side plate is provided with a plurality of through holes, and the through holes penetrate through the side plate.

5. The battery cell according to claim 4, characterized in that: The plurality of through holes are arranged in multiple rows and columns on the side plate.

6. The battery cell according to claim 3, characterized in that: A clearance groove is provided at a position of the side plate corresponding to the explosion-proof valve.

7. The battery cell according to claim 1, characterized in that: The dimension L of the insulating pad in the thickness direction satisfies: 0.2mm≤L≤0.3mm.

8. The battery cell according to claim 1, characterized in that: An exhaust gap is provided between the insulating pad and the edge of the lower plastic. Along the width direction of the battery cell, the exhaust gap W between the insulating pad and the edge of the lower plastic satisfies: 0.5 mm ≤ W ≤ 3 mm.

9. The battery cell according to claim 1, characterized in that: An exhaust gap is provided between the insulating pad and the edge of the lower plastic. Along the thickness direction of the battery cell, the exhaust gap H between the insulating pad and the edge of the lower plastic satisfies: 0.5mm≤H≤3mm.

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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