Battery pack and electric equipment

Abstract

The utility model relates to the technical field of energy storage, and discloses a battery pack and electric equipment, the battery pack comprises an air guide piece and an adhesive layer, the air guide piece is adhered with the adhesive layer, the air guide piece is provided with an air collection structure and air holes, the air collection structure is positioned in the air guide piece, the air holes are formed in the outer wall surface, in contact with the adhesive layer, of the air guide piece, and the air holes are communicated with the air collection structure. According to the battery pack, the air holes are formed in the adhesive layer, the adhesive layer shields the air holes, and based on the arrangement of the air guide piece, air generated in the adhesive layer forming process can enter the air collection structure through the air holes, so that the number of cavities formed due to air trapping in the adhesive layer is relatively small, the overall reliability of the adhesive layer is relatively high, and the battery pack has relatively high structural strength.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage, particularly to a battery pack and an electric device. BACKGROUND

[0002] In the battery pack, the components are usually connected by using an adhesive, for example, the connection between the battery and the box. In the related art, the type of adhesive used in the battery pack is in a foaming form. Taking the connection between the battery and the box as an example, the adhesive is foamed and expanded in the box to fill the space between the battery and the box, thereby connecting the battery and the box. However, the use of this type of adhesive to connect the components will generate gas during the foaming process. The gas is easily blocked by the foaming of the adhesive in other areas and cannot be smoothly discharged, thereby being trapped in the local area of the adhesive, forming a "trapped gas" phenomenon. Too many trapped gas areas will prevent the adhesive from fully and closely contacting the components, which results in poor overall reliability of the adhesive structure and low structural strength of the battery pack. SUMMARY

[0003] The primary object of the utility model is to provide a battery pack with relatively high structural strength.

[0004] To achieve the above object, the utility model provides a battery pack, which comprises a gas guide member and an adhesive layer, the gas guide member is bonded with the adhesive layer, wherein the gas guide member has a gas collection structure and a gas hole, the gas collection structure is located in the gas guide member, the outer wall surface of the gas guide member in contact with the adhesive layer is provided with the gas hole, the number of the gas holes is multiple, the multiple gas holes are communicated with the gas collection structure, and the adhesive layer shields the gas holes.

[0005] In a specific embodiment of the utility model, the gas guide member has a gas cavity, the gas cavity forms the gas collection structure, and the adhesive layer covers the gas guide member.

[0006] In a specific embodiment of the utility model, the battery pack has a first direction and a second direction intersecting with each other, the gas guide member comprises a first gas guide rod, the length direction of the first gas guide rod extends along the first direction, the first gas guide rod has the gas collection structure and the gas hole, the number of the first gas guide rods is multiple, and the multiple first gas guide rods are arranged at intervals along the second direction.

[0007] In a specific embodiment of this utility model, the air guide further includes a second air guide rod, the length direction of which extends along the second direction. The second air guide rod has the air collecting structure and the air hole. There are multiple second air guide rods, which are arranged at intervals along the first direction. The second air guide rods intersect with the first air guide rods, and the air collecting structure of the second air guide rods is connected to the air collecting structure of the first air guide rods.

[0008] In a specific embodiment of this utility model, the battery pack further has a third direction, wherein the first direction, the second direction, and the third direction intersect each other;

[0009] The battery pack includes a housing and batteries. The batteries are disposed in the housing. There are multiple batteries, and the multiple batteries are arranged along the first direction and the second direction to form a battery pack. In the third direction, the battery pack has a connecting wall, and the connecting wall is connected to the adhesive layer.

[0010] In a specific embodiment of this utility model, both the first air guide rod and the second air guide rod are in contact with the connecting wall surface.

[0011] In a specific embodiment of this utility model, the battery pack has a peripheral wall surface, which is arranged around the center of the battery pack. The peripheral wall surface is connected to the connecting wall surface, and a cavity is formed between the peripheral wall surface and the inner wall surface of the casing.

[0012] At least a portion of both ends of the first air guide rod along its length direction extend into the cavity, and the air collection structure of the first air guide rod communicates with the cavity;

[0013] And / or,

[0014] At least both ends of the second air guide rod along its length extend into the cavity, and the air collection structure of the second air guide rod communicates with the cavity.

[0015] In a specific embodiment of this utility model, the box has an exhaust port, which is located on the outer wall of the box and is connected to the inside of the box, and is connected to the cavity.

[0016] In a specific embodiment of this utility model, the box includes a box body and a box cover, the box body and the box cover are connected along the third direction, and a receiving cavity is formed between the box body and the box cover, and the battery pack is disposed in the receiving cavity;

[0017] In the third direction, the connecting wall surface faces the box lid, and the connecting wall surface is connected to the box lid through the adhesive layer;

[0018] or,

[0019] In the third direction, the connecting wall faces away from the box lid, and the connecting wall is connected to the box body through the adhesive layer.

[0020] This utility model also proposes an electrical device, including the battery pack described above.

[0021] The present invention discloses a battery pack and electrical device, which, compared with the prior art, have the following advantages:

[0022] The battery pack of this utility model has a gas-collecting structure and vents in its gas-guiding component. The vents are located on the outer wall of the gas-guiding component. Based on the design of the gas-guiding component, the gas generated during the adhesive layer forming process can enter the gas-collecting structure through the vents. As a result, the number of cavities formed by trapped gas in the adhesive layer is relatively small, and the overall reliability of the adhesive layer is relatively high, thus giving the battery pack relatively high structural strength. Furthermore, since there are multiple vents, it is difficult to completely block all the vents during the adhesive layer forming process, ensuring that the gas-guiding component can perform its gas-guiding function and that the gas generated during the adhesive layer forming process can smoothly enter the gas-collecting structure through the vents. Attached Figure Description

[0023] Figure 1 This is a perspective view of the battery pack according to an embodiment of the present invention;

[0024] Figure 2 This is an exploded view of the battery pack according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the air guide component according to an embodiment of the present invention;

[0026] Figure 4 This is a top view of the battery pack of this utility model embodiment without the box cover;

[0027] Figure 5 This is an exploded view of the battery pack of another embodiment of this utility model with the adhesive layer removed;

[0028] Figure 6 This is a utility model Figure 5 The illustrated embodiment shows a perspective view of the battery pack without the case cover and adhesive layer.

[0029] Figure 7 This is an exploded view of the battery pack of another embodiment of this utility model with the adhesive layer removed;

[0030] Figure 8 This is a utility model Figure 7 The illustrated embodiment shows a perspective view of the battery pack without the case cover and adhesive layer.

[0031] Figure 9 This is a perspective view of the battery pack without the box cover in other embodiments of this utility model;

[0032] Figure 10 This is an exploded view of a battery pack according to another embodiment of this utility model.

[0033] In the diagram, 1 is the adhesive layer; 2 is the air guide; 201 is the air collection structure; 201A is the air cavity; 202 is the air hole; 21 is the first air guide rod; 22 is the second air guide rod; 3 is the housing; 301 is the exhaust port; 31 is the main body of the housing; 32 is the housing cover; 4 is the battery; 400 is the battery pack; 4011 is the connecting wall; 4012 is the peripheral wall; 100 is the cavity; 200 is the receiving cavity; X is the first direction; Y is the second direction; Z is the third direction. Detailed Implementation

[0034] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0039] This utility model proposes an electrical device that includes a battery pack as described below. The battery pack is used to store and output electrical energy to provide power to the electrical device, which includes, but is not limited to, electric vehicles, drones, and mobile power banks. Since the electrical device uses the battery pack described below, it also has the advantages of the battery pack described below, which will not be elaborated further in this application.

[0040] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a battery pack including a gas guide 2 and an adhesive layer 1. The gas guide 2 is bonded to the adhesive layer 1. The gas guide 2 has a gas collecting structure 201 and vents 202. The gas collecting structure 201 is located inside the gas guide 2. The outer wall surface of the gas guide 2 in contact with the adhesive layer 1 is provided with vents 202. There are multiple vents 202, and the multiple vents 202 are connected to the gas collecting structure 201. The adhesive layer 1 covers at least a portion of the vents 202.

[0041] Based on the configuration of the air guide 2, the gas generated during the foaming process of the adhesive layer 1 can enter the gas collection structure 201 through the air holes 202. As a result, the number of cavities formed by trapped gas in the adhesive layer 1 is relatively small, and the overall reliability of the adhesive layer 1 is relatively high, thus giving the battery pack relatively high structural strength. Since there are multiple air holes 202, it is difficult to completely block all air holes 202 during the molding process of the adhesive layer 1, which ensures that the air guide 2 can perform the air guiding function, allowing the gas generated during the molding process of the adhesive layer 1 to smoothly enter the gas collection structure 201 through the air holes 202.

[0042] For example, the adhesive layer 1 is formed by foaming a foaming adhesive. The gas generated during the foaming process enters the gas collection structure 201 through the pores 202 of the gas guide 2. After the adhesive layer 1 is formed, the pores 202 are covered. The adhesive layer 1 can also be formed by other adhesives that generate gas during the forming process. This application does not limit this.

[0043] In some embodiments, the air guide 2 is a porous material, such as melamine foam, which has low density and many small and dense pores on its surface and inside. The pores on its surface constitute the air pores 202, while the pores inside constitute the gas collection structure 201. With this structure, the adhesive is unlikely to completely block the air pores 202 during the foaming process, thus ensuring that the air guide 2 can perform the air guiding function, allowing the gas generated during the foaming process of the adhesive to smoothly enter the gas collection structure 201 through the air pores 202.

[0044] In this embodiment, the gas guide 2 has a gas cavity 201A, which forms a gas collection structure 201. The gas cavity 201A can accommodate more gas. The adhesive layer 1 covers the gas guide 2, that is, the adhesive layer 1 covers all the pores 202. Thus, during the molding process, the gas generated by the adhesive layer 1 can enter the gas collection structure 201 of the gas guide 2 from multiple directions, further reducing the number of cavities formed by trapped gas in the adhesive layer 1, making the overall reliability of the adhesive layer 1 higher, and thus giving the battery pack higher structural strength.

[0045] It should be noted that when the air guide 2 is not a porous material, more air holes 202 with relatively small diameters can be opened on the surface of the air guide 2 to avoid all air holes 202 being completely blocked by the adhesive, thereby ensuring that the air guiding function of the air guide 2 can be realized smoothly.

[0046] In this embodiment, the battery pack has a first direction X and a second direction Y that are perpendicular to each other. The air guide 2 includes a first air guide rod 21. The length direction of the first air guide rod 21 extends along the first direction X. The first air guide rod 21 has a gas collection structure 201 and a vent 202. There are multiple first air guide rods 21. The multiple first air guide rods 21 are arranged at intervals along the second direction Y. That is, the adhesive layer 1 is covered with multiple first air guide rods 21. Based on this, the air guide 2 provides a gas collection structure 201 for gas to enter at different positions of the adhesive layer 1, which greatly increases the gas collection area and can effectively reduce the number of cavities formed by gas trapping in the adhesive layer 1.

[0047] Furthermore, the air guide 2 also includes a second air guide rod 22, which extends along the second direction Y. The second air guide rod 22 has a gas collection structure 201 and a vent 202. There are multiple second air guide rods 22, which are arranged at intervals along the first direction X. The second air guide rods 22 intersect with the first air guide rod 21, and the gas collection structure 201 of the second air guide rod 22 is connected to the gas collection structure 201 of the first air guide rod 21. Based on this, the air guide 2 divides the adhesive layer 1 into multiple regions. The gas generated during the molding process of the adhesive layer 1 in each region can enter the gas collection structure 201 from multiple directions through the vent 202 of the air guide 2. This can further reduce the number of cavities formed by trapped gas in the adhesive layer 1, making the overall reliability of the adhesive layer 1 higher, and thus giving the battery pack higher structural strength.

[0048] In this embodiment, for example, such as Figure 2 As shown, there are seven first air guide rods 21 and two second air guide rods 22. All first air guide rods 21 are located between two second air guide rods 22, and the two ends of the first air guide rods 21 along their length direction are respectively connected to the two second air guide rods 22. At this time, the air guide 2 divides the adhesive layer 1 into seven regions. With the cooperation of the air guide 2 with the adhesive layer 1 through this structure, the overall reliability of the adhesive layer 1 is high. Moreover, the two ends of all first air guide rods 21 along their length direction are connected to second air guide rods 22. These two second air guides 2 can play a role in blocking the adhesive. By placing the adhesive layer 1 between these two second air guides 2, the amount of adhesive layer 1 overflowing can be reduced.

[0049] In other embodiments, such as Figure 5 and Figure 6 As shown, there are seven first air guide rods 21 and five second air guide rods 22. At this time, the air guide 2 divides the adhesive layer 1 into twenty-eight regions. With the cooperation of the air guide 2 and the adhesive layer 1 in this structure, the adhesive layer 1 of the same volume covers the air guide 2 with more regions. The number of cavities formed by the adhesive layer 1 due to air trapping is less, and the overall reliability of the adhesive layer 1 is higher.

[0050] In other embodiments, such as Figure 7 and Figure 8 As shown, there are six first air guide rods 21 and three second air guide rods 22. At this time, the air guide 2 divides the adhesive layer 1 into twenty-eight regions. With the cooperation of the air guide 2 and the adhesive layer 1 in this structure, the adhesive layer 1 of the same volume covers the air guide 2 with more regions. The number of cavities formed by the adhesive layer 1 due to air trapping is less, and the overall reliability of the adhesive layer 1 is higher.

[0051] It should be noted that the battery pack also includes components such as the housing 3, batteries 4, and busbars. The housing 3 includes a main body 31 and a cover 32. The main body 31 and the cover 32 are connected and form a receiving cavity 200 between them. The batteries 4 and the busbars are located in the receiving cavity 200. There are multiple batteries 4 and multiple busbars. Multiple batteries 4 are arranged to form a battery pack 400. The busbars are connected to the batteries 4. Multiple busbars are connected in series or in parallel with multiple batteries 4. This is the prior art, and this application will not elaborate on it. Based on this structure of the battery pack, the adhesive layer 1 can connect multiple batteries 4, or connect the battery pack 400 to the cover 32, or connect the battery pack 400 to the main body 31, or connect the busbars to the cover 32, or connect the busbars to the main body 31. This application does not limit this.

[0052] In this embodiment, the battery pack also has a third direction Z, and the first direction X, the second direction Y, and the third direction Z are mutually perpendicular; as shown Figure 2 As shown, multiple batteries 4 are arranged along the first direction X and the second direction Y to form a battery pack 400. In the third direction Z, the battery pack 400 has a connecting wall 4011, which is connected to the adhesive layer 1. At this time, the adhesive layer 1 serves to connect the multiple batteries 4 to improve the overall structural strength of the battery pack 400. Since the adhesive layer 1 covers the air guide 2, the overall reliability of the adhesive layer 1 is relatively high. Therefore, the overall structural strength of the battery pack 400 will be higher, and the structural strength of the battery pack will also be higher.

[0053] Furthermore, both the first air guide rod 21 and the second air guide rod 22 are in contact with the connecting wall surface 4011. At this time, the first air guide rod 21 and the second air guide rod 22 act as adhesive blockers. The adhesive is confined between the first air guide rod 21 and the second air guide rod 22 during foaming and molding, which can prevent the adhesive from flowing away from the area formed by the first air guide rod 21 and the second air guide rod 22. This ensures that each area has a preset amount of adhesive, which is beneficial to ensuring the bonding performance of the adhesive layer 1 after foaming.

[0054] In this utility model, the battery pack 400 has a peripheral wall 4012, which is arranged around the center of the battery pack 400. The peripheral wall 4012 is connected to the connecting wall 4011, and a cavity 100 is formed between the peripheral wall 4012 and the inner wall of the housing 3. At least a portion of the first air guide rod 21 extends into the cavity 100 at both ends along its length, and the air collection structure 201 of the first air guide rod 21 is in communication with the cavity 100; and / or, at least a portion of the second air guide rod 22 extends into the cavity 100 at both ends along its length, and the air collection structure 201 of the second air guide rod 22 is in communication with the cavity 100. In this embodiment, as... Figure 4As shown, only the second air guide rod 22 extends into the cavity 100. At this time, the gas generated during the molding process of the adhesive layer 1 can be discharged into the cavity 100 after entering the gas collection structure 201 of the air guide 2, preventing gas from accumulating within the gas collection structure 201; in other embodiments, such as... Figure 4 and Figure 8 As shown, only the second air guide rod 22 extends into the cavity 100, which also prevents gas volume from accumulating within the gas collecting structure 201; while in other embodiments, such as Figure 9 As shown, both ends of all the first air guide rods 21 and all the second air guide rods 22 extend into the cavity 100. This also prevents gas volume from existing in the gas collection structure 201. In addition, it also makes the cavities 100 around the battery pack 400 interconnected, thereby balancing the air pressure inside the housing 3 and helping to reduce the adverse effects of air pressure imbalance. In some other embodiments, only the first air guide rod 21 extending into the cavity 100 can also prevent gas volume from existing in the gas collection structure 201. This application will not elaborate on this further.

[0055] Furthermore, the housing 3 has an exhaust port 301, which is located on the outer wall of the housing 3 and connects to the interior of the housing 3. The exhaust port 301 is also connected to the cavity 100, thereby allowing gas entering the cavity 100 to be discharged from the exhaust port 301. For example, in this embodiment, as shown... Figure 1 and Figure 2 As shown, the exhaust port 301 is located on the box cover 32.

[0056] As a specific implementation of this embodiment, such as Figure 2 As shown, the main body 31 and the cover 32 are connected along the third direction Z, and a receiving cavity 200 is formed between the main body 31 and the cover 32. The battery pack 400 is disposed in the receiving cavity 200. In the third direction Z, the connecting wall 4011 faces the cover 32. The connecting wall 4011 is connected to the cover 32 through the adhesive layer 1. At this time, the adhesive layer 1 connects the cover 32 and the battery pack 400, which can improve the overall structural strength of the battery pack 400.

[0057] In other embodiments, such as Figure 10 As shown, the structure of the housing 3 is the same as that of this embodiment. The difference is that, on the third direction Z, the connecting wall 4011 faces away from the housing cover 32. The connecting wall 4011 is connected to the housing body 31 through the adhesive layer 1, which can also improve the overall structural strength of the battery pack 400.

[0058] In summary, based on the configuration of the air guide 2, the number of cavities formed by trapped air within the adhesive layer 1 is relatively small, resulting in relatively high overall reliability of the adhesive layer 1 and giving the battery pack relatively high structural strength.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack, characterized by, The battery comprises a viscose layer (1) and a gas guide (2) which is bonded with the viscose layer (1), wherein the gas guide (2) has a gas collecting structure (201) and a gas hole (202), the gas collecting structure (201) is located in the gas guide (2), the outer wall surface of the gas guide (2) in contact with the viscose layer (1) is provided with the gas hole (202), the number of the gas hole (202) is multiple, multiple gas holes (202) are communicated with the gas collecting structure (201), and the viscose layer (1) shields at least part of the gas hole (202).

2. The battery pack of claim 1, wherein, The gas guide (2) has a gas cavity (201A) therein, the gas cavity (201A) forms the gas collecting structure (201), and the viscose layer (1) covers the gas guide (2).

3. The battery pack of claim 2, wherein, The battery has a first direction (X) and a second direction (Y) intersecting with each other, the gas guide (2) comprises a first gas guide rod (21), the length direction of the first gas guide rod (21) extends along the first direction (X), the first gas guide rod (21) has the gas collecting structure (201) and the gas hole (202), and the number of the first gas guide rod (21) is multiple.

4. The battery pack of claim 3, wherein, The gas guide (2) further comprises a second gas guide rod (22), the length direction of the second gas guide rod (22) extends along the second direction (Y), the second gas guide rod (22) has the gas collecting structure (201) and the gas hole (202), the number of the second gas guide rod (22) is multiple, multiple second gas guide rods (22) are arranged at intervals along the first direction (X), the second gas guide rod (22) is arranged intersecting with the first gas guide rod (21), and the gas collecting structure (201) of the second gas guide rod (22) is communicated with the gas collecting structure (201) of the first gas guide rod (21).

5. The battery pack of claim 4, wherein, The battery further has a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) intersect with each other two by two. The battery comprises a box body (3) and a battery (4), the battery (4) is arranged in the box body (3), the number of the battery (4) is multiple, multiple batteries (4) are arranged along the first direction (X) and the second direction (Y) to form a battery group (400), and the battery group (400) has a connecting wall surface (4011) in the third direction (Z), the connecting wall surface (4011) is connected with the viscose layer (1).

6. The battery pack of claim 5, wherein, The first gas guide rod (21) and the second gas guide rod (22) are both in contact with the connecting wall surface (4011).

7. The battery pack of claim 5, wherein, The battery group (400) has a circumferential wall surface (4012) which is arranged around the center of the battery group (400), the circumferential wall surface (4012) is connected with the connecting wall surface (4011), and a cavity (100) is formed between the circumferential wall surface (4012) and the inner wall surface of the box body (3). At least one end of the first air guide rod (21) in the length direction thereof extends into the cavity (100), and the air collecting structure (201) of the first air guide rod (21) communicates with the cavity (100); And / or, At least one end of the second air guide rod (22) in the length direction thereof extends into the cavity (100), and the air collecting structure (201) of the second air guide rod (22) communicates with the cavity (100).

8. The battery pack of claim 7, wherein, The box body (3) has an exhaust port (301) arranged on the outer wall surface of the box body (3) and communicating with the box body (3), and the exhaust port (301) communicates with the cavity (100).

9. The battery pack of claim 5, wherein, The box body (3) includes a box main body (31) and a box cover (32), the box main body (31) and the box cover (32) are connected in the third direction (Z), and a containing cavity (200) is formed between the box main body (31) and the box cover (32), and the battery pack (400) is arranged in the containing cavity (200); In the third direction (Z), the connecting wall surface (4011) faces the box cover (32), and the connecting wall surface (4011) is connected with the box cover (32) through the adhesive layer (1); Or, In the third direction (Z), the connecting wall surface (4011) faces away from the box cover (32), and the connecting wall surface (4011) is connected with the box main body (31) through the adhesive layer (1).

10. An electric device, characterized by The battery pack comprises the battery pack as claimed in any one of claims 1-9.

Images