Battery pack and electric device

Abstract

This application discloses a battery pack and an electrical device. The battery pack has intersecting circumferential and axial directions. The battery pack includes a receiving component with a receiving space; multiple individual cells are stacked in a ring along the circumferential direction within the receiving space, with the opposite sides of adjacent individual cells in contact with each other; wherein the receiving component has sidewalls arranged along the circumferential direction, surrounding the exterior of the multiple individual cells and contacting the exterior of the multiple individual cells in the circumferential direction. Because the individual cells are arranged in a ring, the expansion force is uniformly distributed through the ring sidewalls, ultimately making the expansion force experienced by each individual cell in the entire battery pack system more consistent, thereby improving the charge and discharge performance of the battery pack.

Description

Technical Field

[0001] This application relates to the technical field of secondary batteries, and more particularly to a battery pack and an electrical device. Background Technology

[0002] Multiple individual cells are electrically connected in series or parallel and placed inside a battery box, where a battery management system, cooling system, and other components are integrated to ultimately form a battery pack.

[0003] In existing related technologies, multiple square single cells are generally stacked in a straight line, with the large surfaces of adjacent single cells touching each other. When a single cell expands due to charging and discharging, the resulting expansion force is transmitted along a straight line.

[0004] The above settings cause the expansion force of individual cells near the two ends to work on the battery pack casing, causing the casing to deform and releasing some of the expansion force on the individual cells near the two ends. However, the expansion force of individual cells closer to the middle is difficult to release due to battery deformation and other reasons. This results in different expansion forces on individual cells at different positions, leading to inconsistent stress on individual cells at different positions, which affects the working performance and service life of the battery pack. Summary of the Invention

[0005] This application provides a battery pack and an electrical device to solve the technical problem in the current related technology that the uniformity of the stress state of a single battery cell during charging and discharging affects the service life and working performance of the battery pack.

[0006] In a first aspect, this application discloses a battery pack having intersecting circumferential and axial directions, comprising: a receiving component having a receiving space; Multiple individual cells are stacked in a ring along the circumferential direction within the accommodating space, with the opposite sides of adjacent individual cells in contact with each other along the circumferential direction. The receiving component has a sidewall disposed along the circumferential direction, the sidewall surrounding the exterior of the plurality of individual cells and contacting the exterior of the plurality of individual cells in the circumferential direction.

[0007] To achieve the above technical solution, since the individual cells are arranged in a ring, the expansion force generated by the individual cells is mainly transmitted between the individual cells. The remaining expansion force will do work evenly on the housing component to cause the housing component to deform or tend to deform. That is, the expansion force is evenly distributed through the ring sidewall, so that the expansion force experienced by each individual cell in the entire battery pack system tends to be consistent, reducing the force difference caused by the expansion force on individual cells in different positions, thereby improving the charging and discharging performance of the battery pack.

[0008] As one of the optional embodiments of this solution, the plurality of said individual cells are arranged in a ring shape.

[0009] The above technical solution further makes the stress conditions between individual cells more consistent, ensuring consistent performance of individual cells.

[0010] As one of the optional embodiments of this solution, each of the individual cells has two first sides close to other individual cells, the two first sides are inclined at an angle, the distance between the two first sides gradually decreases towards the center of the circumferential direction, and the first sides of adjacent individual cells that are in contact with each other along the circumferential direction are parallel to each other.

[0011] To achieve the above technical solution, since the first side of the two adjacent individual cells that are in contact with each other is parallel, combined with the inclined design of the first side, it can be ensured that the contact force can be transmitted in a relatively standardized manner along the circumferential direction, so that the expansion force is transmitted more evenly in the circumferential direction, which is conducive to ensuring the consistency of the stress state of each individual cell.

[0012] As one of the optional embodiments of this solution, the battery pack further includes a fixing post extending along the axial direction. The fixing post is disposed at one end of the plurality of individual cells away from the side wall. The plurality of individual cells are arranged in a ring around the fixing post, and one end of the individual cell near the fixing post is in contact with the outer surface of the fixing post.

[0013] As one of the optional embodiments of this solution, the fixing column is provided with an installation groove along the axial direction.

[0014] To achieve the above technical solution, the fixing column mainly serves to support and isolate the individual cells. The individual cells only abut against each other on their first side, so that the expansion force is transmitted along the circumferential direction, thus preventing the individual cells from contacting each other in other directions and causing the expansion force to be transmitted in other directions. This regulates the expansion force on the individual cells. The mounting groove in the middle of the fixing column can facilitate the installation of electrical components or cooling components, and can also reduce the weight of the battery pack, which is beneficial to the requirements of lightweight design.

[0015] As one of the optional embodiments of this solution, a buffer is provided between two adjacent individual cells along the circumferential direction, and the buffer is respectively arranged in contact with the opposite side of the two individual cells.

[0016] As one of the optional embodiments of this solution, the buffer is configured as an elastic element with elasticity.

[0017] As one of the optional embodiments of this solution, the buffer is configured as a ring.

[0018] By implementing the above technical solution, the buffer can absorb part of the expansion force, provide buffer space for the deformation of the single battery, ensure the space required for normal deformation of the single battery during charging and discharging, and make the transmission of expansion force relatively mild.

[0019] As one of the optional embodiments of this solution, the receiving component includes a carrier plate and a fixing member. The single cell is placed on the carrier plate at one end face in the axial direction. The fixing member surrounds the outside of the plurality of single cells along the circumferential direction. The fixing member is in contact with the outside of the plurality of single cells. The side of the fixing member near the single cell forms the sidewall. The carrier plate and the fixing member surround the receiving space.

[0020] As one of the optional embodiments of this solution, the fastener is configured as an elastic strap.

[0021] As one of the optional embodiments of this solution, the housing component includes a box body with an opening and a box cover covering the opening, the box cover closing the opening to form the housing space, and the box body forming the sidewall facing the inner wall surface of the single battery cell.

[0022] On the other hand, this application also discloses an electrical device comprising: the battery pack described above.

[0023] One of the above technical solutions has the following advantages or beneficial effects: Because the individual cells are arranged in a ring, the expansion force generated by the individual cells is mainly transmitted between the individual cells. The remaining expansion force will do work evenly on the housing components to cause the housing components to deform or tend to deform. That is, the expansion force is evenly distributed through the ring sidewalls, so that the expansion force experienced by each individual cell in the entire battery pack system tends to be consistent, reducing the force difference caused by the expansion force on individual cells in different positions, thereby improving the charging and discharging performance of the battery pack. Attached Figure Description

[0024] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0025] Figure 1 These are accompanying drawings used to illustrate the relevant background technology; Figure 2 This is an overall structural diagram of the battery pack provided in Embodiment 1 of this application; Figure 3 This is an exploded structural diagram of the battery pack provided in Embodiment 1 of this application; Figure 4This is an exploded view provided in Embodiment 1 of this application, mainly used to illustrate the structure of a single battery cell and a buffer component; Figure 5 This is an exploded structural diagram provided in this application to illustrate the specific structure of a single cell battery; Figure 6 This is an analytical diagram provided in this application to illustrate the wedge-shaped design of a single cell. Figure 7 This is a top view provided in Embodiment 1 of this application, primarily used to illustrate the arrangement of individual battery cells; Figure 8 This is a top view of the single cell provided in this application when it is square; Figure 9 This is an exploded structural diagram of the battery pack structure in Embodiment 2 provided in this application; Figure 10 This is an exploded structural diagram of the battery pack structure in Embodiment 3 provided in this application.

[0026] Reference numerals: 1. Receiving component; 1a. Receiving space; 1b. Side wall; 11. Carrier plate; 12. Fixing component; 16. Box body; 161. Opening; 17. Box lid; 100. Receptacle; 101. Shell; 102. Cover; 1021. Positive terminal; 1022. Negative terminal; 1011. First side surface; 1012. Second side surface; 1013. Third side surface; 200. Electrode assembly; 2. Single cell battery; 3. Fixed column; 31. Mounting groove; 4. Buffer component; X, circumferential direction; Z, axial direction; 5. Busbar; 62. Battery box; 61. Insulating board; 63. Battery cover; 64. Module box; 612. Insulation chamber. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0029] The following is in conjunction with the appendix Figure 1 This section introduces relevant existing technologies.

[0030] Reference Figure 1 In existing related technologies, a battery pack is generally formed by stacking multiple square individual cells 2 in a straight line and placing them in a housing 16. The large faces of adjacent individual cells 2 are in contact with each other. This battery pack design causes the expansion force generated by the individual cells 2 during charging and discharging to be transmitted along a straight line. This results in the expansion force of the cells 2 near the ends doing work on the battery pack housing, causing deformation of the housing and releasing some of the expansion force. However, the expansion force of the cells 2 closer to the center is difficult to release due to battery deformation and force transmission, resulting in different expansion forces on individual cells 2 at different locations. For example, in… Figure 1 As shown, the denser the cross-sectional lines of a single cell 2, the more complex the stress conditions. Therefore, in existing related technologies, the stress conditions of single cells 2 at different locations within the battery pack are inconsistent, affecting the working performance and service life of the battery pack.

[0031] The following is in conjunction with the appendix Figure 2-10 This application will be further described below.

[0032] Reference Figure 2 and Figure 3 This application discloses a battery pack having intersecting circumferential directions X and axial directions Z, wherein in this embodiment, the axial direction Z is perpendicular to the circumferential direction X.

[0033] The battery pack includes housing component 1 and multiple individual cells 2.

[0034] The housing component 1 refers to the battery casing, battery box, or other container of the battery pack used to hold individual battery cells 2, and it has a housing space 1a. Multiple individual battery cells 2 are stacked in a ring along the circumferential direction X within the housing space 1a, and the opposite sides of adjacent individual battery cells 2 along the circumferential direction X are in contact with each other.

[0035] The receiving component 1 has a sidewall 1b disposed along the circumferential direction X, which surrounds the exterior of the plurality of individual battery cells 2 and contacts the exterior of the plurality of individual battery cells 2 in the circumferential direction X. The battery pack also includes a busbar 5 for electrical connection between the plurality of individual battery cells 2 and for electrical connection with the outside. In this embodiment, the busbar 5 is annular and communicates with the electrodes of the plurality of individual battery cells 2 respectively. The fixing method between the busbar 5 and the electrodes of the individual battery cells 2 includes, but is not limited to, welding and bonding.

[0036] With the above configuration, since the individual cells 2 are arranged in a ring, the expansion force generated by the individual cells 2 is mainly transmitted between the individual cells 2. The remaining expansion force will do work evenly on the receiving component 1 to cause the receiving component 1 to deform or tend to deform. That is, the expansion force is evenly distributed through the annular sidewall 1b, so that the expansion force experienced by each individual cell 2 in the entire battery pack system tends to be consistent, reducing the force difference generated by the individual cells 2 in different positions when subjected to expansion force, thereby improving the charging and discharging performance of the battery pack.

[0037] It should be noted that the "contact" or "contact setup" described in this article refers to the final state during the operation of the battery pack, where the two adjacent individual cells 2 in the circumferential direction X come into contact due to the expansion force generated during charging and discharging, allowing the expansion force to be transferred between the individual cells 2. However, it is possible that when the battery pack is first manufactured, there may be a gap between the two adjacent individual cells 2 in the circumferential direction X, and the "contact" or "contact setup" is only achieved during charging and discharging due to the expansion of the individual cells 2. The individual cell 2 described in this article can also be a battery cell.

[0038] It should be noted that the structure of the housing component 1 can take many forms.

[0039] For example, in one example, the housing component 1 includes a carrier plate 11 and a fastener 12.

[0040] The carrier plate 11 is a circular flat plate, and each individual battery 2 rests on one end face of the carrier plate 11 in the Z-axis direction. The individual battery 2 is arranged in a ring around the center of the carrier plate 11. The fixing member 12 is an elastic strap, which can be made of metal, plastic, or other materials. Two fixing members 12 are arranged along the Z-axis direction, and each fixing member 12 is arranged around the outside of multiple individual batteries 2 in the circumferential direction X. The fixing member 12 is in contact with the outside of the multiple individual batteries 2, and the side of the fixing member 12 near the individual battery 2 forms a sidewall 1b. The sidewall 1b abuts against the outer wall of the individual battery 2, thereby fixing and limiting the individual battery 2. The carrier plate 11 and the fixing member 12 form an accommodating space 1a.

[0041] In this example, the battery pack is assembled using the fastener 12 and the carrier plate 11. Firstly, the fastener 12 has a certain degree of deformation, allowing for the placement of individual battery cells 2 during assembly. After confirming the positions and connections of the individual battery cells 2 and other electrical components, the fastener 12 is then installed. This provides operators with more flexibility in placing or adjusting the positions of the individual battery cells 2, facilitating the operation. Secondly, it also significantly saves materials and effectively reduces costs.

[0042] Reference Figure 3 and Figure 4 In one optional example, specifically, multiple individual battery cells 2 are arranged in a ring. Each individual battery cell 2 has two first side surfaces 1011 close to other individual battery cells 2, the two first side surfaces 1011 are angled together, and the distance between the two first side surfaces 1011 gradually decreases towards the center in the circumferential direction X. The first side surfaces 1011 of adjacent individual battery cells 2 that are in contact with each other in the circumferential direction X are parallel to each other. The positive and negative electrodes of the individual battery cells 2 are located on the top end facing away from the carrier plate 11 in the axial direction Z, and the busbar 5 is connected to the positive and negative electrodes of the battery.

[0043] More specifically, the individual cell 2 can be wedge-shaped or other shapes. See the attached diagram for details. Figure 5 and Figure 6 A more detailed explanation of the wedge-shaped design of the single cell 2.

[0044] Reference Figure 5 The single-cell battery 2 includes a housing 100 and an electrode assembly 200 disposed within the housing 100. The housing 100 includes a shell 101 and a cover 102. The electrode assembly 200 is placed inside the shell 101, and a positive electrode post 1021 and a negative electrode post 1022 are disposed on the cover 102. The electrode assembly 200 includes a positive electrode sheet, a separator, and a negative electrode sheet, which are wound or stacked to form the electrode assembly 200. The positive and negative electrode tabs of the electrode assembly 200 are connected to the positive electrode post 1021 and the negative electrode post 1022 respectively to achieve electrical conduction. The positive electrode post 1021 and the negative electrode post 1022 are electrically connected to a busbar 5 to achieve electrical conduction between the single-cell battery 2 and the external environment.

[0045] Reference Figure 5 and Figure 6 The peripheral side of the casing 101 includes a first side 1011 that contacts the adjacent single cell 2, a second side 1012 that is close to the center of the carrier plate 11, and a third side 1013 that is opposite to the second side 1012. The two first sides 1011 are parallel to the Z direction, and the second side 1012 and the third side 1013 are perpendicular to the Z direction.

[0046] More specifically, refer to Figure 6 Each individual cell 2 has a central surface that passes through the central axis of the carrier plate 11. The two first side surfaces 1011 have the same angle with the central surface, meaning that the individual cells 2 are symmetrically arranged about the central surface. This arrangement ensures that the force-bearing surface formed between the two first side surfaces 1011 of two adjacent individual cells 2 passes through the central axis of the carrier plate 11. Force analysis of this surface shows that the direction of expansion force transmission is perpendicular to the radial direction of the carrier plate 11. Similarly, the transmission of expansion force between any two adjacent individual cells 2 is perpendicular to the radial direction of the array ring. This further standardizes the transmission of expansion force, reduces inconsistencies in expansion force transmission, minimizes the impact of expansion force on the individual cells 2, and improves the overall performance of the battery pack.

[0047] The above configuration, due to the regular circular arrangement of the individual cells 2, ensures that the stress on each individual cell 2 is consistent throughout the entire battery pack system, thereby improving the performance consistency of the individual cells 2. Furthermore, because the individual cells 2 are designed in a "wedge" shape, the first sides 1011 of two adjacent individual cells 2 that meet are parallel. Combined with the inclined design of the first sides 1011, this ensures that the contact force is transmitted relatively uniformly along the circumferential direction, making the expansion force more evenly distributed circumferentially. This helps ensure the consistency of the stress state of each individual cell 2, thereby improving the performance of the battery pack.

[0048] Continue to refer to Figure 4 The battery pack also includes a fixing post 3 extending along the Z-axis. The fixing post 3 is disposed at one end of the plurality of individual cells 2 away from the side wall 1b. Specifically, in this embodiment, the fixing post 3 is coaxially fixedly disposed on the surface of the carrier plate 11, and the plurality of individual cells 2 are arranged in a ring around the fixing post 3. The end of the individual cell 2 near the fixing post 3 is in contact with the outer surface of the fixing post 3. The fixing post 3 has a mounting groove 31 along the Z-axis.

[0049] In order to match the annular array of the fixing post 3 and the single battery 2, the second side 1012 is set to be arc-shaped and fits the outer wall of the fixing post 3, and the third side 1013 is set to be arc-shaped with the center of the fixing post 3 as the center.

[0050] In the above configuration, the fixing post 3 mainly serves to support and isolate the individual battery cells 2. The individual battery cells 2 only abut against each other on their first side 1011, so that the expansion force is transmitted along the circumferential direction, thus preventing the individual battery cells 2 from contacting each other in other directions and causing the expansion force to be transmitted in other directions. This regulates the expansion force experienced by the individual battery cells 2. The mounting groove 31 set in the middle of the fixing post 3 can facilitate the installation of electrical components or cooling components, and can also reduce the weight of the battery pack, which is beneficial to the requirements of lightweight design.

[0051] Reference Figure 4 and Figure 7 A buffer 4 is also provided between two adjacent individual cells 2 along the circumferential direction X. The buffer 4 is in contact with the opposite side of each of the two individual cells 2. The buffer 4 is configured as an elastic element.

[0052] The above settings enable the buffer 4 to absorb part of the expansion force, provide buffer space for the deformation of the single battery 2, ensure the space required for normal deformation of the single battery 2 during charging and discharging, and make the transmission of expansion force relatively mild.

[0053] In one example, the buffer 4 is specifically configured as a frame shape, and the edge of the buffer 4 extends to the edge of the first side 1011. More specifically, this configuration effectively saves costs while ensuring the isolation and buffering functions described above. Furthermore, when a single cell 2 expands, the central region is generally more prone to expansion. Designing the buffer 4 as a frame shape avoids the central region of the single cell 2, thus facilitating the expansion of the single cell 2 while still achieving isolation and buffering. In other alternative embodiments, the buffer 4 can also be configured as an annular sheet.

[0054] It should be noted that the individual battery 2 and the buffer 4 can also be designed in other shapes. For example Figure 8 As shown, the individual battery 2 is designed as a conventional square battery, and the corresponding buffer 4 is designed as a "wedge". The individual batteries 2 are arranged in a ring around the fixed post 3, and the buffer 4 is sandwiched between two adjacent individual batteries 2. When the individual battery 2 is set as square, the buffer 4 is set as wedge, which facilitates the contact and the uniform transmission of expansion force.

[0055] In another alternative embodiment, refer to Figure 9 The housing component 1 has a different structure. Specifically, the housing component 1 includes a box 16 with an opening 161 and a box cover 17 covering the opening 161. The box cover 17 closes the opening 161 to form a housing space 1a, and the box 16 forms a side wall 1b facing the inner wall surface of the single battery 2.

[0056] In another alternative embodiment, refer to Figure 10 The housing component 1 also has another structure. Specifically, the housing component 1 may further include: a battery box 62, a battery cover 63, and an insulating plate 61 spaced apart in the battery box 62 along the Z direction. The insulating plate 61 divides the battery box 62 into several insulating chambers 612. The housing component 1 also includes module boxes 64 correspondingly placed in the insulating chambers 612. Each module box 64 contains several individual batteries 2 stacked in a ring. When individual batteries 2 are placed in each module box 64, the structure of each module box 64 plus the individual batteries 2 is similar to... Figure 2 or Figure 9The battery pack shown has the same structure. This configuration can further integrate multiple independent battery packs into a larger battery pack. Due to the special design of the individual battery 2 and the busbar 5, in order to avoid short circuits between adjacent module boxes 64, an insulating plate 61 is provided between two adjacent module boxes 64 along the Z direction.

[0057] It should be noted that, in one example, to facilitate electrical connection between adjacent busbars 5, through holes are made in the insulating plate 61 for the passage of electrical connection connectors.

[0058] Using this embodiment, Figure 2 or Figure 9 The entire battery pack is treated as a battery module, and multiple battery packs are stacked and placed into a battery box 62, thereby achieving the combination of more individual battery cells 2. In this embodiment, an insulating plate 61 is provided between the module boxes 64 stacked along the Z-axis to achieve insulation of the busbar 5, so as to avoid the risk of short circuit caused by the busbar 5 contacting other individual battery cells 2.

[0059] On the other hand, this application also discloses an electrical device comprising the battery pack described above. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc.

[0060] The above description is only a partial implementation of the embodiments of this application and is not intended to limit the application in any way. The protection scope of the embodiments of this application is not limited thereto. Any simple modifications, equivalent changes and alterations that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A battery pack having intersecting circumferential directions (X) and axial directions (Z), characterized in that, include: The receiving component (1) has a receiving space (1a); Multiple single-cell batteries (2) are stacked in a ring along the circumferential direction (X) in the accommodating space (1a), and the opposite sides of adjacent single-cell batteries (2) along the circumferential direction (X) are in contact with each other. The receiving component (1) has a sidewall (1b) arranged along the circumferential direction (X), the sidewall (1b) surrounding the outside of the plurality of individual cells (2) and contacting the outside of the plurality of individual cells (2) in the circumferential direction (X); The receiving component (1) includes a carrier plate (11) and a fixing member (12). The single cell (2) rests on the carrier plate (11) at one end face in the axial direction (Z). The fixing member (12) surrounds the outside of the plurality of single cells (2) along the circumferential direction (X). The fixing member (12) is in contact with the outside of the plurality of single cells (2). The side of the fixing member (12) near the single cell (2) forms the side wall (1b). The carrier plate (11) and the fixing member (12) surround to form the receiving space (1a). The fastener (12) is configured as an elastic strap; The battery pack also includes a fixing post (3) extending along the axial direction (Z), the fixing post (3) being disposed at one end of the plurality of individual cells (2) away from the side wall (1b); the peripheral side surface of the individual cell (2) has a second side surface (1012) near the center of the carrier plate (11); the second side surface (1012) is arc-shaped and fits the outer side wall of the fixing post (3).

2. The battery pack as described in claim 1, characterized in that, Multiple individual cells (2) are arranged in a circular shape.

3. The battery pack as described in claim 2, characterized in that, Each of the individual cells (2) has two first side surfaces (21) close to other individual cells (2), the two first side surfaces (21) are inclined at an angle, the distance between the two first side surfaces (21) gradually decreases towards the center of the circumferential direction (X), and the first side surfaces (21) of adjacent individual cells (2) along the circumferential direction (X) are parallel to each other.

4. The battery pack as described in claim 2, characterized in that, Multiple individual cells (2) are arranged in a ring around the fixing post (3), and one end of the individual cell (2) near the fixing post (3) is attached to the outer side of the fixing post (3).

5. The battery pack as described in claim 4, characterized in that, The fixed column (3) has an installation groove (31) along the axial direction (Z).

6. The battery pack as described in claim 1, characterized in that, A buffer (4) is provided between two adjacent single cells (2) along the circumferential direction (X), and the buffer (4) is respectively in contact with the opposite side of the two single cells (2).

7. The battery pack as described in claim 6, characterized in that, The buffer (4) is configured as an elastic element.

8. The battery pack as described in claim 6, characterized in that, The buffer (4) is configured as a ring.

9. The battery pack according to any one of claims 1-8, characterized in that, The housing component (1) includes a housing (16) having an opening (161) and a cover (17) covering the opening (161), the cover (17) closing the opening (161) to form the housing space (1a), and the housing (16) forming the sidewall (1b) facing the inner wall surface of the single battery (2).

10. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1-9.

Images