Cell cover assembly, cell and battery pack

Abstract

This utility model relates to the field of battery cell technology, and discloses a battery cell cover assembly, a battery cell, and a battery pack. The battery cell cover assembly includes a cover body and a terminal post assembly. The cover body has a through-hole extending along its thickness direction, and a recessed platform is provided around the periphery of the mounting hole. The terminal post assembly includes a terminal post body and a connecting ring. The connecting ring is sleeved on the outside of the terminal post body, and the terminal post body is inserted into the mounting hole and extends at least to the outer side of the cover body. The connecting ring is welded to the recessed platform, forming a welding trajectory. The width of the cover body is W1. In the width direction of the cover body, the distances between the welding trajectory and the opposite sides of the cover body in the width direction are W2 and W3, respectively, satisfying 0.25≤(W2+W3) / W1≤0.6. This utility model provides sufficient width space between the welding trajectory and the edge of the cover body in the width direction to avoid deformation of the cover body caused by high welding temperatures, thereby facilitating the installation of the battery cell cover assembly.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, specifically to battery cell cover plate assembly, battery cell, and battery pack. Background Technology

[0002] With the increasing maturity of new energy battery technology, new energy batteries are widely used as power batteries in electric vehicles and energy storage, and the requirements for the performance and safety of new energy batteries are becoming increasingly stringent.

[0003] The cell cover is a key component in new energy batteries. Its functions include welding with the casing to form a sealed cavity, leading out the positive and negative electrodes, and serving as an assembly carrier. The cell cover mainly consists of the cover body, lower plastic, sealing ring, explosion-proof valve, and terminal assembly. The terminal assembly includes a connecting ring and terminals, which are welded to the cover body in a series of rings.

[0004] like Figure 1 As shown, existing electrode assembly 2' is typically cylindrical. To meet the overcurrent capability under high charging rates, the electrode diameter is correspondingly increased. With the cover plate body 1' remaining unchanged in size, the space in the width direction of the cover plate body 1' becomes increasingly compact, and the welding trajectory 3' gets closer and closer to the edge in the width direction of the cover plate body 1'. After the electrode assembly 2' and the cover plate body 1' are welded, the distance W0 between the edge in the width direction of the cover plate body 1' and the welding trajectory 3' is further reduced, resulting in severe deformation of the cover plate body 1', which in turn affects the assembly of the cover plate body 1' and the housing. Utility Model Content

[0005] In view of this, the present invention provides a cell cover assembly, a cell, and a battery pack to solve the problem that existing cell covers, in order to improve the current carrying capacity of the terminals, increase the size of the terminals, which leads to easy deformation of the cover and affects the assembly of the cover and the housing.

[0006] In a first aspect, this utility model provides a battery cell cover assembly, comprising:

[0007] The cover plate body has a through mounting hole along the thickness direction, and the cover plate body has a countersunk platform along the periphery of the mounting hole;

[0008] The pole assembly includes a pole body and a connecting ring. The connecting ring is sleeved on the outside of the pole body. The pole body is inserted into the mounting hole and extends at least to the outer side of the cover plate body. The connecting ring is welded and fixed to the recessed platform, forming a welding trajectory.

[0009] The width of the cover plate body is W1. In the width direction of the cover plate body, the distances between the welding trajectory and the opposite two sides of the cover plate body in the width direction are W2 and W3, respectively, satisfying 0.25≤(W2+W3) / W1≤0.6.

[0010] Beneficial Effects: The battery cell cover assembly of this utility model, by controlling the ratio of the distance between the welding trajectory and the edge of the cover body in the width direction to the width of the cover body within a suitable range, can reserve sufficient width space between the welding trajectory and the edge of the cover body in the width direction. This disperses the welding heat effect, avoids deformation of the cover body caused by high welding temperatures, improves the flatness and structural stability of the cover body, and facilitates the assembly of the cover body onto the battery cell housing. If the value of (W2+W3) / W1 is too small, the welding trajectory is too close to the edge of the cover body in the width direction, and the cover body is easily deformed by the high welding temperatures. If the value of (W2+W3) / W1 is too large, the electrode body needs to extend excessively along the length direction of the cover body, making the welding of the connecting ring and the countersunk platform more difficult, and also making the fixing of the electrode body and the connecting ring more difficult, which is not easy to install.

[0011] In one optional embodiment, the distance between the welding trajectory and the opposite two sides of the cover plate body in the width direction is equal, then 0.25≤2W2 / W1≤0.6, or 0.25≤2W3 / W1≤0.6.

[0012] Beneficial effects: Setting the distance between the welding trajectory and the opposite sides of the cover plate body in the width direction is equal can make the thermal stress generated during welding evenly distributed in the width direction of the cover plate body, avoid warping on one side of the cover plate body, and further improve the structural stability of the cover plate body.

[0013] In one alternative implementation, 14mm≤W1≤100mm, 3mm≤W2≤30mm, and 3mm≤W3≤30mm.

[0014] Beneficial effects: By controlling W1, W2, and W3 within a suitable range, it is possible to further ensure that the welding trajectory is located in a suitable position in the width direction, avoiding the welding trajectory being too close to the edge of the cover plate body in the width direction, which would cause the cover plate body to deform. At the same time, it can also ensure that the pole body has sufficient flow area and reduce the installation difficulty of the pole body.

[0015] In one optional embodiment, the cross-section of the pole body perpendicular to the thickness direction is shaped like an athletic track, and the mounting hole is correspondingly set as an athletic track hole. The hole wall contour of the mounting hole includes two first arc segments and two first straight segments. The two first straight segments are arranged relatively spaced along the width direction of the cover plate body, and the two first arc segments are arranged relatively spaced and symmetrically along the length direction of the cover plate body. The two first arc segments are respectively connected to the two ends of the two first straight segments on the same side.

[0016] Beneficial effects: Designing the pole body in the shape of an athletic track and setting the mounting holes accordingly as athletic track holes increases the cross-sectional area of ​​the pole body, while increasing the distance between the welding trajectory and the two sides of the cover plate body in the width direction, thus preventing deformation of the cover plate body. It also increases the torque of the pole body and prevents the pole body from loosening and falling off.

[0017] In one optional embodiment, the radius of the first arc segment is R1, and the center distance between the two first arc segments is L1, satisfying 2.5mm≤R1≤25mm and 1mm≤L1≤30mm.

[0018] Beneficial effects: By controlling the radius R1 of the first arc segment and the center distance L1 between the two first arc segments within a suitable range, it is possible to ensure that the pole body has sufficient current carrying capacity, while avoiding the pole body having an excessively large length-to-width ratio, which would make it difficult to install the pole body.

[0019] In one optional embodiment, the connecting ring has a cross-section perpendicular to the thickness direction that is a track-track shaped ring, and the outer periphery of the sinking platform is correspondingly set to a track-track shape. The outer periphery of the sinking platform includes two second arc segments and two second straight segments. The two second straight segments are arranged relatively spaced along the width direction of the cover plate body, and the two second arc segments are arranged relatively spaced and symmetrically along the length direction of the cover plate body. The two second arc segments are respectively connected to the two ends of the two second straight segments located on the same side.

[0020] Beneficial effects: By setting the connecting ring to the pole body in the shape of a track and field track, and setting the outer contour of the sinking platform to the shape of a track and field track, it is easy to integrally injection mold the connecting ring and the pole body, and to smoothly weld the connecting ring and the sinking platform.

[0021] In one optional embodiment, the radius of the second arc segment is R2, the center of the two second arc segments coincides with the center of the two first arc segments respectively, and the distance between the centers of the two second arc segments is L2, satisfying 6mm≤R2≤35mm and 1mm≤L2=L1≤30mm.

[0022] Beneficial effects: By controlling the radius of the second arc segment to R2 and the center distance L2 between the two second arc segments within a suitable range, sufficient welding space can be reserved, and the centers of the two second arc segments can be aligned with the centers of the two first arc segments respectively, which facilitates the installation of the pole body and the connecting ring.

[0023] In one alternative embodiment, the connecting ring is integrally injection molded with the pole body.

[0024] Beneficial effects: Injection molding the connecting ring and the pole body into one piece simplifies the processing technology, helps reduce manufacturing costs, and provides high structural strength between the connecting ring and the pole body.

[0025] Secondly, this utility model also provides a battery cell, comprising:

[0026] The housing has an opening at at least one end;

[0027] In the aforementioned cell cover assembly, the cover body is disposed over the opening and connected to the housing.

[0028] Beneficial Effects: The battery cell of this invention, by controlling the ratio of the distance between the welding trajectory and the edge of the cover plate body in the width direction to the width of the cover plate body within a suitable range, can reserve sufficient width space between the welding trajectory and the edge of the cover plate body in the width direction. This disperses the welding heat effect, avoids deformation of the cover plate body caused by high welding temperatures, improves the flatness and structural stability of the cover plate body, and facilitates the assembly of the cover plate body onto the battery cell housing. If the value of (W2+W3) / W1 is too small, the welding trajectory is too close to the edge of the cover plate body in the width direction, and the cover plate body is easily deformed by the high welding temperatures. If the value of (W2+W3) / W1 is too large, the electrode body needs to extend excessively along the length direction of the cover plate body, making the welding of the connecting ring and the countersunk platform more difficult, and also making the fixing of the electrode body and the connecting ring more difficult, thus hindering installation.

[0029] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0030] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be elaborated here. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a structural schematic diagram of an existing battery cell cover assembly;

[0033] Figure 2 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present utility model;

[0034] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0035] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0036] Figure 5 This is an exploded view of a battery cell cover assembly according to an embodiment of the present utility model;

[0037] Figure 6 This is a schematic diagram of the structure of the cover plate body of a battery cell cover plate assembly according to an embodiment of the present utility model;

[0038] Figure 7 for Figure 6 Cross-sectional view at point BB;

[0039] Figure 8 This is a schematic diagram of the electrode body and upper insulating component of a battery cell cover assembly according to an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] Existing technology: 1', cover plate body; 2', pole post assembly; 3', welding trajectory;

[0042] This application includes: 1. Cover plate body; 101. Mounting hole; 1011. First arc segment; 1012. First straight segment; 102. Recessed platform; 1021. Second arc segment; 1022. Second straight segment; 2. Pole post assembly; 201. Pole post body; 202. Connecting ring; 3. Welding trajectory; 4. Upper insulating component; 5. Lower insulating component; 6. Sealing ring. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] The following is combined Figures 2 to 8The following describes embodiments of the present invention.

[0045] According to embodiments of the present invention, on the one hand, such as Figure 2 As shown, a battery cell cover assembly is provided, mainly including: a cover body 1 and a terminal assembly 2. The cover body 1 has a mounting hole 101 extending along the thickness direction, and a recessed platform 102 is provided around the mounting hole 101. The terminal assembly 2 includes a terminal body 201 and a connecting ring 202. The connecting ring 202 is sleeved on the outside of the terminal body 201. The terminal body 201 is inserted into the mounting hole 101 and extends at least to the outer side of the cover body 1. The connecting ring 202 is welded and fixed to the recessed platform 102, forming a welding trajectory 3.

[0046] The width of the cover plate body 1 is W1. In the width direction of the cover plate body 1, the distances between the welding trajectory 3 and the two opposite sides of the cover plate body 1 in the width direction are W2 and W3, respectively, satisfying 0.25≤(W2+W3) / W1≤0.6.

[0047] Therefore, the battery cell cover assembly provided in this embodiment of the present invention, by controlling the ratio of the distance between the welding trajectory 3 and the edge of the cover body 1 in the width direction to the width of the cover body 1 within a suitable range, can reserve sufficient width space between the welding trajectory 3 and the edge of the cover body 1 in the width direction, disperse the welding heat effect, avoid deformation of the cover body 1 caused by high welding temperature, improve the flatness and structural stability of the cover body 1, and facilitate the assembly of the cover body 1 onto the battery cell housing. If the value of (W2+W3) / W1 is too small, the welding trajectory 3 is too close to the edge of the cover body 1 in the width direction, and the cover body 1 is easily deformed by the high welding temperature. If the value of (W2+W3) / W1 is too large, the electrode body 201 needs to extend excessively along the length direction of the cover body 1, the welding difficulty of the connecting ring 202 and the countersunk platform 102 is greater, the fixing difficulty of the electrode body 201 and the connecting ring 202 is also greater, and it is not easy to install.

[0048] Specifically, the width direction of the cover plate body 1 is as follows: Figure 2 As shown by arrow W in the diagram, the length direction of the cover plate body 1 is as follows: Figure 2 As indicated by arrow L in the diagram. The electrode body 201 includes a positive electrode and a negative electrode, which are respectively located at both ends of the cover plate body 1 along its length.

[0049] It should be noted that after the cell cover assembly is installed on the cell housing, one end of the electrode body 201 needs to extend to the outside and be electrically connected to the busbar.

[0050] In one embodiment, the distance between the welding trajectory 3 and the opposite sides of the cover plate body 1 in the width direction is equal, then 0.25≤2W2 / W1≤0.6, or 0.25≤2W3 / W1≤0.6. Setting the distance between the welding trajectory 3 and the opposite sides of the cover plate body 1 in the width direction equal can uniformly distribute the thermal stress generated during welding in the width direction of the cover plate body 1, avoid warping on one side of the cover plate body 1, and further improve the structural stability of the cover plate body 1.

[0051] Furthermore, in one embodiment, 14mm≤W1≤100mm, 3mm≤W2≤30mm, and 3mm≤W3≤30mm. By controlling W1, W2, and W3 within a suitable range, it is possible to further ensure that the welding trajectory 3 is located in a suitable position in the width direction, avoiding the welding trajectory 3 being too close to the edge of the cover plate body 1 in the width direction, which would cause deformation of the cover plate body 1. At the same time, it is also possible to ensure that the pole body 201 has sufficient flow area and reduce the installation difficulty of the pole body 201.

[0052] In one embodiment, such as Figure 5 and Figure 6 As shown, the cross-section of the pole body 201 perpendicular to the thickness direction is shaped like an athletic track, and the mounting hole 101 is correspondingly set as an athletic track hole. The hole wall contour of the mounting hole 101 includes two first arc segments 1011 and two first straight segments 1012. The two first straight segments 1012 are arranged relatively spaced along the width direction of the cover plate body 1, and the two first arc segments 1011 are arranged relatively spaced and symmetrically along the length direction of the cover plate body 1. The two first arc segments 1011 are respectively connected to the two ends of the two first straight segments 1012 located on the same side.

[0053] The pole body 201 is designed in the shape of an athletic track, and the mounting hole 101 is correspondingly set as an athletic track hole. While increasing the cross-sectional area of ​​the pole body 201, the distance between the welding trajectory 3 and the two sides of the cover plate body 1 in the width direction is increased, which avoids deformation of the cover plate body and can also improve the torque of the pole body 201, preventing the pole body 201 from loosening and falling off.

[0054] Furthermore, in one embodiment, such as Figure 6 As shown, the radius of the first arc segment 1011 is R1, and the center distance between the two first arc segments 1011 is L1, satisfying 2.5mm≤R1≤25mm and 1mm≤L1≤30mm. By controlling the radius R1 of the first arc segment 1011 and the center distance L1 between the two first arc segments 1011 within a suitable range, it can be ensured that the pole body 201 has sufficient current carrying capacity, while avoiding an excessively large aspect ratio of the pole body 201, which would make it difficult to install the pole body 201.

[0055] Furthermore, the first arc segment 1011 can be a semicircle, and the distance between the centers of the two ends of the first arc segment 1011 is equivalent to the length of the first straight line segment 1012.

[0056] In one embodiment, such as Figure 6 and Figure 7 As shown, the cross-section of the connecting ring 202 perpendicular to the thickness direction is a track and field track-shaped ring, and the outer periphery of the sinking platform 102 is correspondingly set as a track and field track shape. The outer periphery of the sinking platform 102 includes two second arc segments 1021 and two second straight segments 1022. The two second straight segments 1022 are arranged relatively spaced along the width direction of the cover plate body 1, and the two second arc segments 1021 are arranged relatively spaced and symmetrically along the length direction of the cover plate body 1. The two second arc segments 1021 are respectively connected to the two ends of the two second straight segments 1022 located on the same side.

[0057] The connecting ring 202 is set to the track-track shaped ring corresponding to the pole body 201, and the outer periphery of the sinking platform 102 is also set to the track-track shaped ring, so as to facilitate the integral injection molding of the connecting ring 202 and the pole body 201, and the smooth welding of the connecting ring 202 and the sinking platform 102.

[0058] Similarly, the second arc segment 1021 can also be a semicircle, and the distance between the centers of the two ends of the second arc segment 1021 is equivalent to the length of the second straight line segment 1022.

[0059] Furthermore, in one embodiment, such as Figure 6 As shown, the radius of the second arc segment 1021 is R2. The centers of the two second arc segments 1021 coincide with the centers of the two first arc segments 1011, respectively. The distance between the centers of the two second arc segments 1021 is L2, satisfying 6mm≤R2≤35mm and 1mm≤L2=L1≤30mm. By controlling the radius R2 of the second arc segment 1021 and the distance L2 between the centers of the two second arc segments 1021 within a suitable range, sufficient welding space can be reserved. Coincidentating the centers of the two second arc segments 1021 with the centers of the two first arc segments 1011 facilitates the installation of the pole body 201 and the connecting ring 202.

[0060] In one embodiment, the connecting ring 202 and the pole body 201 are integrally injection molded. Integrating the connecting ring 202 and the pole body 201 into one piece simplifies the processing technology, helps reduce manufacturing costs, and provides high structural strength between the connecting ring 202 and the pole body 201.

[0061] In one embodiment, such as Figure 3 and Figure 4As shown, the cell cover assembly also includes an upper insulating member 4 and a lower insulating member 5. The upper insulating member 4 is sleeved on the outside of the connecting ring 202 and wraps around the connecting ring 202 and the terminal body 201, providing insulation for the terminal body 201. The maximum outer diameter of the upper insulating member 4 is smaller than the maximum outer diameter of the connecting ring 202, and the difference between the maximum outer diameter of the connecting ring 202 and the maximum outer diameter of the upper insulating member 4 is X, satisfying 1.5mm≤X≤3mm. The lower insulating member 5 is fixed to the lower surface of the cover body 1, providing insulation between the cover body 1 and the internal components of the cell.

[0062] In one embodiment, such as Figure 4 and Figure 5 As shown, the cell cover assembly also includes a sealing ring 6. The cover body 1 first protrudes along the periphery of the mounting hole 101 to form a boss, and then extends outward to form a countersunk platform 102. The sealing ring 6 is sandwiched between the cover body 1 and the terminal body 201, and the sealing ring 6 extends towards the boss to form a barb, which limits the movement of the barb and the boss. The sealing ring 6 is used to improve the sealing performance and also has insulation properties to prevent the terminal body 201 from directly contacting the cover body 1.

[0063] According to an embodiment of the present invention, another aspect provides a battery cell, mainly comprising: a housing and a battery cell cover assembly. The housing has an opening at at least one end. The cover body 1 of the battery cell cover assembly covers the opening and is connected to the housing.

[0064] The battery cell provided in this embodiment of the utility model, by controlling the ratio of the distance between the welding trajectory 3 and the edge of the cover body 1 in the width direction to the width of the cover body 1 within a suitable range, can reserve sufficient width space between the welding trajectory 3 and the edge of the cover body 1 in the width direction, disperse the welding heat effect, avoid deformation of the cover body 1 caused by high welding temperature, improve the flatness and structural stability of the cover body 1, and facilitate the assembly of the cover body 1 onto the battery cell housing. If the value of (W2+W3) / W1 is too small, the welding trajectory 3 is too close to the edge of the cover body 1 in the width direction, and the cover body 1 is easily deformed by the high welding temperature. If the value of (W2+W3) / W1 is too large, the electrode body 201 needs to extend excessively along the length direction of the cover body 1, the welding difficulty of the connecting ring 202 and the countersunk platform 102 is greater, the fixing difficulty of the electrode body 201 and the connecting ring 202 is also greater, and it is not easy to install.

[0065] Specifically, the housing contains an electrode assembly, and one side of the electrode assembly has an electrode tab. The electrode tab is electrically connected to the electrode post body 201. The connection between the cover plate body 1 and the housing can be any existing connection structure as needed; therefore, this embodiment of the invention does not impose excessive restrictions on this aspect.

[0066] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: at least one of the above-described battery cells.

[0067] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated here.

[0068] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An electrochemical cell cover plate assembly, comprising: include: The cover plate body has a through mounting hole along the thickness direction, and the cover plate body has a countersunk platform along the periphery of the mounting hole; The pole assembly includes a pole body and a connecting ring. The connecting ring is sleeved on the outside of the pole body. The pole body is inserted into the mounting hole and extends at least to the outer side of the cover plate body. The connecting ring is welded and fixed to the recessed platform, forming a welding trajectory. The width of the cover plate body is W1. In the width direction of the cover plate body, the distances between the welding trajectory and the opposite two sides of the cover plate body in the width direction are W2 and W3, respectively, satisfying 0.25≤(W2+W3) / W1≤0.

6.

2. The cell cover plate assembly of claim 1, wherein, If the distance between the welding trajectory and the opposite two sides of the cover plate body in the width direction is equal, then 0.25≤2W2 / W1≤0.6, or 0.25≤2W3 / W1≤0.

6.

3. The cell cover plate assembly of claim 2, wherein, 14mm≤W1≤100mm, 3mm≤W2≤30mm, 3mm≤W3≤30mm.

4. The cell cover plate assembly of any one of claims 1-3, wherein, The cross-section of the pole body perpendicular to the thickness direction is shaped like an athletic track, and the mounting hole is correspondingly set as an athletic track hole. The hole wall contour of the mounting hole includes two first arc segments and two first straight segments. The two first straight segments are arranged relatively spaced along the width direction of the cover plate body, and the two first arc segments are arranged relatively spaced and symmetrically along the length direction of the cover plate body. The two first arc segments are respectively connected to the two ends of the two first straight segments on the same side.

5. The cell cover plate assembly of claim 4, wherein, The radius of the first arc segment is R1, and the distance between the centers of the two first arc segments is L1, satisfying 2.5mm≤R1≤25mm and 1mm≤L1≤30mm.

6. The cell cover plate assembly of claim 4, wherein, The connecting ring has a cross-section perpendicular to the thickness direction that is shaped like an athletic track. The outer periphery of the sinking platform is correspondingly shaped like an athletic track. The outer periphery of the sinking platform includes two second arc segments and two second straight segments. The two second straight segments are arranged relatively spaced along the width direction of the cover plate body. The two second arc segments are arranged relatively spaced and symmetrically along the length direction of the cover plate body. The two second arc segments are respectively connected to the two ends of the two second straight segments on the same side.

7. The cell cover plate assembly of claim 6, wherein, The radius of the second arc segment is R2, the center of the two second arc segments coincides with the center of the two first arc segments respectively, and the distance between the centers of the two second arc segments is L2, satisfying 6mm≤R2≤35mm, 1mm≤L2=L1≤30mm.

8. The cell cover assembly according to any one of claims 1 to 3, characterized in that, The connecting ring and the pole body are integrally injection molded.

9. An electric cell characterized by include: The housing has an opening at at least one end; The cell cover assembly according to any one of claims 1 to 8, wherein the cover body is disposed over the opening and connected to the housing.

10. A battery pack, characterized by, include: At least one battery cell as described in claim 9.

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