Battery cell cover plate assembly, battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack, the battery cell cover plate assembly comprises a cover plate and lower plastic; a liquid injection hole is formed in the cover plate; the lower plastic is attached to the lower surface of the cover plate, the part, corresponding to the liquid injection hole, of the lower plastic extends downwards to form a boss, a containing space is formed between the boss and the liquid injection hole, a buffering part is arranged on the face, opposite to the liquid injection hole, of the boss, and the two opposite sides, in the length direction of the lower plastic, of the buffering part are connected with the corresponding side walls of the boss through slopes correspondingly. A through hole communicated with the liquid injection hole is formed in the inclined surface, and the inclined surface inclines downwards relative to the lower surface of the cover plate. According to the battery cell cover plate assembly, when the electrolyte is injected into the battery cell, the electrolyte impacts the buffer part on the boss firstly, flows along the inclined plane after being buffered by the buffer part and flows into the battery cell from the through hole, so that the electrolyte can be effectively prevented from directly impacting a pole group in the battery cell, the pole group is prevented from being damaged, and the safety and the reliability of the battery cell are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cover assembly, a battery cell and a battery pack. Background Art

[0002] A battery pack generally includes multiple battery cells, each of which includes a shell, multiple electrode groups disposed in the shell, and a cover assembly disposed on the top of the shell and electrically connected to the electrode groups.

[0003] The cover plate assembly includes a cover plate, a liquid injection hole provided on the cover plate, an explosion-proof valve and other structures. In order to prevent the cover plate from contacting and conducting electricity with the electrode group, a lower plastic for insulation is also provided between the cover plate and the electrode group.

[0004] During the battery cell manufacturing process, electrolyte needs to be injected into the cell through the injection hole on the cover. During this injection process, in order to improve the injection efficiency, the injection pressure is generally high. The electrolyte can easily impact the electrode assembly diaphragm in the battery cell, causing the diaphragm to fold, the electrode assembly to be damaged, and the electrode assembly to short-circuit, ultimately resulting in poor battery cell safety. Summary of the Invention

[0005] In view of this, the present invention provides a battery cover assembly, a battery cell and a battery pack to solve the problem that when the battery cell is filled with electrolyte, the electrolyte easily impacts the electrode group diaphragm, causing damage to the electrode group and even causing a short circuit in the electrode group, ultimately leading to poor safety of the battery cell.

[0006] In a first aspect, the present invention provides a battery cell cover assembly, comprising:

[0007] The cover plate is provided with a through injection hole in the up-down direction;

[0008] The lower plastic is attached to the lower surface of the cover plate, and the portion of the lower plastic corresponding to the liquid injection hole extends downward to form a boss, and an accommodating space is formed between the boss and the liquid injection hole. The liquid injection hole is connected to the accommodating space, and a buffer portion is provided on a side of the boss opposite to the liquid injection hole. The buffer portion is respectively connected to the corresponding side walls of the boss through inclined surfaces on opposite sides along the length direction of the lower plastic. A through hole connected to the liquid injection hole is provided on the inclined surface, and the inclined surface is inclined downward relative to the lower surface of the cover plate.

[0009] Beneficial Effects: The battery cell cover assembly of the present invention has a boss provided on the lower plastic corresponding to the injection hole. When electrolyte is added to the battery cell through the injection hole, the electrolyte first impacts the buffer portion on the boss. After being buffered by the buffer portion, the electrolyte is guided by the inclined surface, causing the electrolyte to flow toward the through hole and finally into the battery cell through the through hole. This can effectively prevent the electrolyte from directly impacting the electrode group in the battery cell, ensuring the stability of the injection, thereby improving the safety and reliability of the battery cell, and also helping to reduce the risk of liquid leakage from the injection hole, thereby improving the production yield of the battery cell and reducing production costs. Moreover, the boss extends downward without affecting the connection between the lower plastic and the cover plate, and also facilitates the assembly of the battery cell.

[0010] In an optional embodiment, a dimension of the buffer portion along the length direction of the lower plastic is L1, which satisfies 0mm<L1≤10mm.

[0011] Beneficial effect: By limiting the length of the buffer portion, the buffering effect of the buffer portion on the electrolyte can be ensured. In addition, the length of the buffer portion can be prevented from being too long, which would affect the guiding effect of the inclined surface.

[0012] In an optional embodiment, the boss further includes a horizontal connecting portion connected between the inclined surface and the corresponding side wall of the boss.

[0013] Beneficial effect: The horizontal connection portion is the transition area between the inclined surface and the side wall of the boss, which can disperse the stress concentration caused by the through hole and avoid stress cracking at the connection between the inclined surface and the corresponding side wall of the boss, thereby improving the structural stability and service life of the boss.

[0014] In an optional embodiment, the dimension of the horizontal connection portion along the length direction of the lower plastic is L2, which satisfies 0mm<L2≤8mm.

[0015] Beneficial effect: By limiting the length of the horizontal connecting portion, the stress concentration caused by the through hole can be further dispersed, ensuring the structural stability of the boss.

[0016] In an optional embodiment, the included angle between the inclined surface and the corresponding side wall of the boss is θ, which satisfies 10°≤θ<85°.

[0017] Beneficial Effect: By limiting the range of the angle θ between the inclined surface and the corresponding side wall of the boss, the flow direction of the electrolyte can be precisely controlled, ensuring that the electrolyte is accurately injected into the battery cell along the preset path, further improving the injection efficiency and safety of the battery cell. If the angle θ is too small, the electrolyte is likely to remain in the storage space.

[0018] In an optional embodiment, the total opening area of the through holes is greater than or equal to the opening area of the liquid injection holes.

[0019] Beneficial effect: Since the total opening area of the through-holes is greater than or equal to the opening area of the injection holes, the electrolyte first passes through the injection holes and then through the accommodating space and through the through-holes, and the injection pressure will be reduced, thereby avoiding excessive electrolyte pressure to impact the electrode group diaphragm and preventing liquid leakage.

[0020] In an optional embodiment, the dimension of the boss along the length direction of the lower plastic is L3, which satisfies 4mm<L3≤50mm;

[0021] And / or, the dimension of the boss along the length direction of the lower plastic is L4, which satisfies 4mm<L4≤25mm.

[0022] Beneficial Effects: By limiting the length and / or width of the boss, interference between the boss and the connecting piece can be avoided, while ensuring that the boss has sufficient space to buffer the electrolyte. If the length and / or width of the boss is too large, it will interfere with the connecting piece, affecting its installation and use. If the length and / or width of the boss is too small, the space is too small, and the buffering effect on the electrolyte is poor.

[0023] In an optional embodiment, the dimension of the boss along the up-down direction is L5, which satisfies 2mm<L5≤11mm.

[0024] Beneficial Effects: By limiting the height of the boss, electrode assembly installation is facilitated and the buffering effect of the electrolyte is ensured. If the boss is too high, it will easily extend beyond the bottom surface of the lower plastic, thereby squeezing the electrode assembly. The boss will also easily lift the cover plate, hindering the installation of the cover plate and the housing. If the boss is too low, the vertical height of the accommodation space is too small, and the buffering effect on the electrolyte is poor.

[0025] In a second aspect, the present invention further provides a battery cell, comprising:

[0026] a housing having an opening on one side;

[0027] In the above-mentioned battery cell cover plate assembly, the cover plate is arranged at the opening.

[0028] Beneficial Effects: Because the battery cell includes a battery cell cover plate assembly, it has the same effect as the battery cell cover plate assembly, that is, the lower plastic is provided with a boss corresponding to the injection hole. When electrolyte is added to the battery cell through the injection hole, the electrolyte first impacts the buffer portion on the boss. After being buffered by the buffer portion, the electrolyte is guided by the inclined surface, causing the electrolyte to flow to the through hole, and finally into the battery cell through the through hole. This can effectively prevent the electrolyte from directly impacting the electrode group in the battery cell, ensure the stability of the injection, thereby improving the safety and reliability of the battery cell, and also helping to reduce the risk of liquid leakage from the injection hole, thereby improving the production yield of the battery cell and reducing production costs. Moreover, the boss extends downward without affecting the connection between the lower plastic and the cover plate, and also facilitates the assembly of the battery cell.

[0029] In a third aspect, the present invention further provides a battery pack comprising: at least one of the above-mentioned battery cells.

[0030] Beneficial Effects: The battery pack of the present invention has a boss on the lower plastic corresponding to the injection hole. When electrolyte is added to the battery cell through the injection hole, the electrolyte first impacts the buffer portion on the boss. After being buffered by the buffer portion, the electrolyte is guided by the inclined surface, causing the electrolyte to flow toward the through hole and finally into the battery cell through the through hole. This can effectively prevent the electrolyte from directly impacting the electrode group in the battery cell, ensure the stability of liquid injection, thereby improving the safety and reliability of the battery cell, and also helps reduce the risk of liquid leakage from the injection hole, thereby improving the production yield of the battery cell and reducing production costs. Moreover, the boss extends downward without affecting the connection between the lower plastic and the cover plate, and also facilitates the assembly of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of a battery cell cover assembly according to an embodiment of the present invention;

[0033] Figure 2 for Figure 1 Cross-section at AA;

[0034] Figure 3 for Figure 2 A partial enlarged view of point B in the middle;

[0035] Figure 4 A schematic diagram of a battery cell cover assembly from another perspective according to an embodiment of the present invention;

[0036] Figure 5 Schematic diagram of the lower plastic of a battery cell cover assembly according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Cover plate; 101. Liquid injection hole; 2. Lower plastic; 3. Boss; 301. Buffer part; 302. Inclined surface; 303. Through hole; 304. Horizontal connecting part; 4. Positive pole; 5. Negative pole; 6. Explosion-proof valve. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0040] The following combination Figures 1 to 5 , describing embodiments of the present invention.

[0041] According to an embodiment of the present invention, on the one hand, Figures 1 to 3 As shown, a cell cover assembly is provided, comprising: a cover 1 and a lower plastic 2. The cover 1 is provided with a through injection hole 101 in the up and down directions. The lower plastic 2 is attached to the lower surface of the cover 1, and the portion of the lower plastic 2 corresponding to the injection hole 101 extends downward to form a boss 3, and a receiving space is formed between the boss 3 and the injection hole 101. The injection hole 101 is connected to the receiving space. A buffer portion 301 is provided on the side opposite to the injection hole 101. The buffer portion 301 is connected to the corresponding side walls of the boss 3 through inclined surfaces 302 on opposite sides along the length direction of the lower plastic 2. A through hole 303 connected to the injection hole 101 is provided on the inclined surface 302, and the inclined surface 302 is inclined downward relative to the lower surface of the cover 1.

[0042] Thus, it can be seen that in the battery cover assembly provided by the embodiment of the present invention, the lower plastic 2 is provided with a boss 3 corresponding to the injection hole 101. When electrolyte is added to the battery cell through the injection hole 101, the electrolyte first impacts the buffer portion 301 on the boss 3. After being buffered by the buffer portion 301, the electrolyte is guided by the inclined surface 302, so that the electrolyte flows to the through hole 303, and finally flows into the battery cell through the through hole 303. This can effectively prevent the electrolyte from directly impacting the electrode group in the battery cell, ensure the stability of the injection, thereby improving the safety and reliability of the battery cell, and also helping to reduce the risk of liquid leakage from the injection hole 101, thereby improving the production yield of the battery cell and reducing production costs. Moreover, the boss 3 extends downward, which will not affect the connection between the lower plastic 2 and the cover 1, and also facilitates the assembly of the battery cell.

[0043] Compared with the structure in which the through hole 303 is set on the side wall of the boss 3, the embodiment of the present invention sets the through hole 303 on the inclined surface 302 of the bottom surface of the boss 3, which can ensure that the electrolyte is injected into the battery cell in a straight line as a whole, so that the electrolyte can flow according to the preset path and improve the injection efficiency.

[0044] In addition, the bottom surface of the boss 3 in the embodiment of the present invention is a T-shaped structure composed of two inclined surfaces 302 and a buffer portion 301. Compared with setting the bottom of the boss 3 into a cone-shaped structure, the embodiment of the present invention has a better effect on the diversion of the electrolyte, which is conducive to guiding the electrolyte to flow from the inclined surface 302 to the through hole 303.

[0045] Specifically, the "up" and "down" directions in the embodiments of the present invention are as follows: Figure 2 As shown, the lower side of the lower plastic 2 is connected to the electrode group in the battery cell. The lower plastic 2 can be fixedly connected to the cover plate 1 by fasteners, or the lower plastic 2 can be fixedly connected to the cover plate 1 by snaps, which is not limited in this embodiment of the present invention. The cover plate 1 is also connected to the battery cell housing, and the connection method can also adopt a snap connection, fastener connection, etc.

[0046] Specifically, the length direction of the lower plastic 2 is as follows Figure 3 and Figure 4 As shown by the arrow L in FIG, the width direction of the lower plastic 2 is as follows Figure 4 As shown in W, the height direction of the lower plastic 2, that is, the up and down direction, as shown in Figure 3 As shown by the arrow H in .

[0047] It should be noted that the embodiment of the present invention does not limit the shape of the through hole 303 , and any existing shape can be selected as needed. For example, the through hole 303 can be a circular hole, a bar hole, an elliptical hole, etc.

[0048] In addition, the embodiment of the present invention does not limit the number of through holes 303, and one, two, or more than two can be selected as needed. Figure 5 As shown, the buffer portion 301 is provided with a through hole 303 on the inclined surface 302 on both sides of the length direction of the lower plastic 2. The through hole 303 can be a strip-shaped hole. The through hole 303 can also pass through the boss 3 along the width direction.

[0049] In one embodiment, Figure 3 As shown, the length L1 of the buffer portion 301 along the length of the lower plastic 2 satisfies the condition 0mm<L1≤10mm. For example, the length L1 of the buffer portion 301 can be 1mm, 5mm, 10mm, etc. By limiting the length of the buffer portion 301, the buffer portion 301 can ensure its buffering effect on the electrolyte while also preventing it from being too long, which could affect the flow-guiding effect of the inclined surface 302.

[0050] Furthermore, in one embodiment, Figure 3 As shown, the dimension of the buffer portion 301 along the length direction of the lower plastic 2 is L1, which satisfies 2mm≤L1≤6mm.

[0051] In one embodiment, Figure 3As shown, the boss 3 further includes a horizontal connecting portion 304, which connects between the inclined surface 302 and the corresponding side wall of the boss 3. The horizontal connecting portion 304 is a transition area between the inclined surface 302 and the side wall of the boss 3. It can disperse the stress concentration caused by the through hole 303, prevent stress cracking at the connection between the inclined surface 302 and the corresponding side wall of the boss 3, thereby improving the structural stability and service life of the boss 3.

[0052] Furthermore, in one embodiment, the length L2 of the horizontal connecting portion 304 along the length of the lower plastic portion 2 satisfies the condition 0 mm < L2 ≤ 8 mm. For example, the length L2 of the horizontal connecting portion 304 can be 2 mm, 4 mm, 8 mm, etc. By limiting the length of the horizontal connecting portion 304, the stress concentration caused by the through hole 303 can be further dispersed, ensuring the structural stability of the boss 3.

[0053] In one embodiment, Figure 3 As shown, the angle θ between the inclined surface 302 and the corresponding side wall of the boss 3 satisfies 10°≤θ<85°. For example, the angle θ is 10°, 45°, 80°, etc. By limiting the range of the angle θ between the inclined surface 302 and the corresponding side wall of the boss 3, it is easier to precisely control the flow direction of the electrolyte, ensuring that the electrolyte is accurately injected into the battery cell along the preset path, further improving the injection efficiency and safety of the battery cell. If the angle θ is less than 10°, the electrolyte is likely to remain in the storage space.

[0054] In one embodiment, the total opening area of the through-holes 303 is greater than or equal to the opening area of the liquid injection hole 101. Because the total opening area of the through-holes 303 is greater than or equal to the opening area of the liquid injection hole 101, the injection pressure is reduced after the electrolyte first passes through the liquid injection hole 101 and then through the accommodation space and through the through-holes 303, thereby preventing excessive electrolyte pressure from impacting the electrode assembly diaphragm and preventing electrolyte leakage.

[0055] It should be noted that the battery cell shell is provided with an electrode group, and the lower plastic 2 is provided between the electrode group and the cover 1 to provide insulation. Figure 1 and Figure 2 As shown, a pair of electrodes are spaced apart on the cover plate 1, comprising a positive electrode 4 and a negative electrode 5. The lower plastic 2 is provided with corresponding mounting holes for the positive and negative electrodes. The positive electrode 4 is mounted on the cover plate 1 through the positive mounting holes, while the negative electrode 5 is mounted on the cover plate 1 through the negative mounting holes. The positive and negative electrodes 4, 5 are electrically connected to the electrode assembly within the housing via connecting tabs. The connecting tabs extend along the length of the lower plastic 2 and are provided with a relief portion to avoid the boss 3, thereby improving the space utilization of the battery cell.

[0056] In addition, the cover plate 1 is provided with an explosion-proof valve 6, and the injection hole 101 is set between the explosion-proof valve 6 and the pole. Correspondingly, the boss 3 is installed between the pole mounting hole and the explosion-proof valve 6. The lower plastic 2 is also provided with an exhaust hole corresponding to the explosion-proof valve 6.

[0057] In one embodiment, Figure 4 As shown, the length dimension L3 of the boss 3 along the length direction of the lower plastic 2 satisfies 4mm<L3≤50mm. For example, the length dimension L3 of the boss 3 is 5mm, 10mm, 15mm, 20mm, 27mm, 50mm, etc.

[0058] And / or, the width dimension L4 of the boss 3 along the lower plastic 2 satisfies 4mm<L4≤25mm. For example, the width dimension L4 of the boss 3 is 5mm, 10mm, 15mm, 20mm, 25mm, etc.

[0059] By limiting the length and / or width of the boss 3, interference between the boss 3 and the connecting piece can be avoided, while ensuring that the boss 3 has sufficient space to buffer the electrolyte. If the length and / or width of the boss 3 is too large, it will interfere with the connecting piece, affecting its installation and use. If the length and / or width of the boss 3 is too small, the space is too small, and the buffering effect on the electrolyte is poor.

[0060] In one embodiment, Figure 3 As shown, the dimension of the boss 3 in the vertical direction is L5, which satisfies 2mm<L5≤11mm. For example, the height dimension L5 of the boss 3 is 3mm, 6mm, 11mm, etc. By limiting the height dimension of the boss 3, the installation of the electrode group is facilitated and the buffering effect of the electrolyte is ensured. If the height of the boss 3 is greater than 11mm, it is easy to exceed the bottom surface of the lower plastic 2, thereby squeezing the electrode group. In addition, the boss 3 is likely to lift the cover plate 1, hindering the installation of the cover plate 1 and the housing. If the height of the boss 3 is less than 2mm, the vertical height of the accommodating space is too small, and the buffering effect on the electrolyte is poor.

[0061] According to another aspect of an embodiment of the present invention, a battery cell is provided, comprising: a housing and a battery cell cover assembly. The housing has an opening on one side. A cover 1 of the battery cell cover assembly is disposed over the opening.

[0062] Because the battery cell includes a battery cell cover plate assembly, it has the same effect as the battery cell cover plate assembly, that is, the lower plastic 2 is provided with a boss 3 corresponding to the injection hole 101. When electrolyte is added to the battery cell through the injection hole 101, the electrolyte first impacts the buffer portion 301 on the boss 3. After being buffered by the buffer portion 301, the electrolyte is guided by the inclined surface 302, so that the electrolyte flows to the through hole 303, and finally flows into the battery cell through the through hole 303. This can effectively prevent the electrolyte from directly impacting the pole group in the battery cell, ensure the stability of the injection, thereby improving the safety and reliability of the battery cell, and also helping to reduce the risk of liquid leakage from the injection hole 101, thereby improving the production yield of the battery cell and reducing production costs. Moreover, the boss 3 extends downward, does not affect the connection between the lower plastic 2 and the cover plate 1, and also facilitates the assembly of the battery cell.

[0063] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising: at least one of the above-mentioned battery cells.

[0064] In the battery pack provided by the embodiment of the present invention, the lower plastic 2 is provided with a boss 3 corresponding to the injection hole 101. When electrolyte is added to the battery cell through the injection hole 101, the electrolyte first impacts the buffer portion 301 on the boss 3. After being buffered by the buffer portion 301, the electrolyte is guided by the inclined surface 302, causing the electrolyte to flow to the through hole 303, and finally flow into the battery cell through the through hole 303. This can effectively prevent the electrolyte from directly impacting the electrode group in the battery cell, ensure the stability of the injection, thereby improving the safety and reliability of the battery cell, and also helps to reduce the risk of liquid leakage from the injection hole 101, thereby improving the production yield of the battery cell and reducing production costs. Moreover, the boss 3 extends downward without affecting the connection between the lower plastic 2 and the cover plate 1, and also facilitates the assembly of the battery cell.

[0065] To achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery management system, a heat dissipation system, etc. It should be noted that the other necessary modules or components included in the battery pack can be of any suitable existing structure. In order to clearly and briefly illustrate the technical solution provided by this embodiment, the above-mentioned part will not be described in detail here, and the drawings in the specification have also been simplified accordingly. However, it should be understood that the scope of the embodiments of the present invention is not limited by this.

[0066] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: The cover plate is provided with a through injection hole in the up-down direction; The lower plastic is attached to the lower surface of the cover plate, and the portion of the lower plastic corresponding to the liquid injection hole extends downward to form a boss, and an accommodating space is formed between the boss and the liquid injection hole. The liquid injection hole is connected to the accommodating space, and a buffer portion is provided on a side of the boss opposite to the liquid injection hole. The buffer portion is respectively connected to the corresponding side walls of the boss through inclined surfaces on opposite sides along the length direction of the lower plastic. A through hole connected to the liquid injection hole is provided on the inclined surface, and the inclined surface is inclined downward relative to the lower surface of the cover plate.

2. The battery cover assembly according to claim 1, characterized in that: The dimension of the buffer portion along the length direction of the lower plastic is L1, which satisfies 0mm<L1≤10mm.

3. The battery cover assembly according to claim 1, characterized in that: The boss further includes a horizontal connecting portion connected between the inclined surface and a corresponding side wall of the boss.

4. The battery cover assembly according to claim 3, characterized in that: The dimension of the horizontal connection portion along the length direction of the lower plastic is L2, which satisfies 0mm<L2≤8mm.

5. The battery cell cover assembly according to any one of claims 1 to 4, characterized in that: The included angle θ between the inclined surface and the corresponding side wall of the boss satisfies 10°≤θ<85°.

6. The battery cover assembly according to claim 5, characterized in that: The total opening area of the through holes is greater than or equal to the opening area of the liquid injection holes.

7. The battery cell cover assembly according to any one of claims 1 to 4, characterized in that: The dimension of the boss along the length direction of the lower plastic is L3, which satisfies the condition 4mm<L3≤50mm; And / or, the dimension of the boss along the length direction of the lower plastic is L4, which satisfies 4mm<L4≤25mm.

8. The battery cell cover assembly according to any one of claims 1 to 4, characterized in that: The dimension of the boss along the up-down direction is L5, which satisfies 2mm<L5≤11mm.

9. A battery cell, characterized in that: include: a shell having an opening on one side; The battery cell cover plate assembly according to any one of claims 1 to 8, wherein the cover plate is arranged at the opening.

10. A battery pack, characterized in that: include: At least one battery cell according to claim 9.

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