Battery pack and electric device

Abstract

The utility model relates to new energy battery technical field discloses a kind of battery pack and electrical equipment, battery pack includes: cabinet, with battery cavity;Multiple electric core, be located in battery cavity, along first direction interval arrangement, electric core includes shell;First enclosing member and second enclosing member, each electric core is located between first enclosing member and second enclosing member, first enclosing member and shell between, second enclosing member and another shell between respectively enclose first cavity;First sealing member and second sealing member, between two electric cores of adjacent all be connected with first sealing member and second sealing member, first sealing member, second sealing member and adjacent shell enclose second cavity.First cavity, second cavity can be used as the expansion space of electric core, also can be used as cooling medium flow channel, shell is also the part of expansion space, cooling medium flow channel, first cavity, second cavity share the wall thickness of shell, save nearly half wall thickness size in first direction, improve the energy density of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] New energy vehicles mostly use battery packs as their power source. A battery pack consists of components such as a housing, batteries, a CCS (Cell Contact System) assembly, and a cooling system. The batteries, CCS assembly, and cooling system are all housed within the housing. Traditionally, there are two main methods for inserting batteries into the housing: one is to first stack the batteries into modules, and then assemble the modules into the housing, but this type of battery pack has a lower energy density; the other is to directly fix the batteries into the housing using structural adhesives, eliminating the module structure and increasing the energy density of the battery pack. This type of battery pack is widely used in the market.

[0003] As the driving range of new energy vehicles increases, the energy density requirements for battery packs are also becoming higher. A battery pack contains multiple cells, each representing an energy storage module with an independent encapsulation shell and polarity output. The cells are stacked with water-cooled plates or side plates and then bonded together with structural adhesives or thermally conductive adhesives to form a module, which is then encapsulated in a box. Alternatively, individual cells can be stacked in a box and bonded to the box with structural adhesives or structurally thermally conductive adhesives.

[0004] However, after the cells are stacked, gaps must be set between them to ensure the heat dissipation efficiency of the cells. These gaps are filled with thermal adhesive, heat dissipation pipes, etc., which reduces the energy density of the battery pack. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack to solve the problem of low energy density in existing battery packs; this invention also provides an electrical device using the battery pack.

[0006] To achieve the above objectives, this utility model provides a battery pack having a first direction, a second direction, and a third direction that are mutually perpendicular to each other. The battery pack includes: The casing includes a battery compartment; Multiple battery cells are disposed in the battery cavity, and the multiple battery cells are spaced apart along the first direction. Each battery cell includes a housing. A first enclosure and a second enclosure are spaced apart along the first direction, and each of the battery cells is disposed between the first enclosure and the second enclosure. The first enclosure and the housing, and the second enclosure and the other housing, respectively form a first cavity. A first seal and a second seal are spaced apart along the third direction. The first seal and the second seal are connected between two adjacent cells. The first seal, the second seal, and the adjacent housing form a second cavity.

[0007] Optionally, the battery pack further includes a sealing plate, an inlet pipe, and a return pipe. The sealing plate is provided at both ends of the first cavity along the second direction and at both ends of the second cavity along the second direction. The multiple sealing plates respectively seal the first cavity and the second cavity. The inlet pipe and the return pipe are provided on both sides of the cell along the second direction. The inlet pipe and the return pipe are connected to each of the first cavity and the second cavity.

[0008] Optionally, the sealing plate has an inner cavity communicating with the first cavity and the second cavity, and the liquid inlet pipe and the liquid return pipe are respectively provided with flow ports, which are communicating with the inner cavity.

[0009] Optionally, the battery pack further includes a flow guide plate, which is provided in both the first cavity and the second cavity. A flow channel extending along the second direction is formed between the flow guide plate and the housing, and multiple flow channels are spaced apart along the third direction.

[0010] Optionally, the guide plate is a corrugated plate, and the corrugated plate and the shell form the flow channel; or, the guide plate is a flat plate, and multiple guide plates are spaced apart along the third direction, with the flow channel formed between two adjacent guide plates.

[0011] Optionally, the battery pack further includes a heat insulation pad, which is filled in both the first cavity and the second cavity.

[0012] Optionally, both the first enclosure and the second enclosure include a first main body and a first bent portion, with the first bent portion connected to both ends of the first main body along the third direction, and the first bent portion being welded or bonded to the shell; and / or, both the first seal and the second seal include a second main body and a second bent portion, with the second bent portion connected to both ends of the second main body along the first direction, and the second bent portion being welded or bonded to the shell.

[0013] Optionally, the battery cell further includes multiple separators, multiple electrode assemblies, and a cover plate. The housing has a receiving cavity, and the multiple separators are disposed in the receiving cavity. The multiple separators are spaced apart along the second direction, and each separator divides the receiving cavity into multiple cavities. Each electrode assembly is disposed in a corresponding cavity, and the cover plate seals the cavity.

[0014] Optionally, the battery cell further includes an insulating element connected between the housing and the cover plate to provide insulation between the cover plate and the housing.

[0015] Optionally, the housing is a one-piece molded structure.

[0016] This utility model also provides an electrical device, including the battery pack described in any of the above technical solutions.

[0017] Compared with the prior art, the battery pack and electrical device of this utility model embodiment have the following advantages: the first enclosure, the second enclosure, and the shell respectively form a first cavity; two adjacent battery cells along the first direction are surrounded by the first sealing member and the second sealing member to form a second cavity. The first cavity and the second cavity can serve as expansion spaces for the battery cells and as cooling medium channels. The shell is also part of the expansion space and the cooling medium channel, sharing the same wall thickness, thus saving nearly half of the wall thickness in the first direction and improving the energy density of the battery pack. Furthermore, if the first cavity and the second cavity serve as cooling medium channels, the cooling medium can directly exchange heat with the shell when flowing in the first cavity and the second cavity, without the need for other heat-conducting media to assist in heat transfer, resulting in better heat exchange and enabling higher charge and discharge rates. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery pack structure of this utility model; Figure 2 yes Figure 1 A schematic diagram of the battery pack structure omitting the casing; Figure 3 yes Figure 2 A partially enlarged schematic diagram of the battery pack; Figure 4 yes Figure 3 A schematic diagram of the connection structure between the sealing plate of the battery pack and the second wall; Figure 5 yes Figure 2 A schematic diagram of the battery pack cells after omitting the cover plate; Figure 6 yes Figure 5 A partially enlarged schematic diagram of the battery pack; Figure 7 yes Figure 5 A schematic diagram of the battery pack structure omitting the sealing plate, inlet pipe, return pipe, and electrode assembly; Figure 8 yes Figure 7 A partially enlarged schematic diagram of the battery pack; Figure 9 yes Figure 7 A partial front view of the battery pack; Figure 10 yes Figure 9 A schematic diagram of the battery pack structure without the air deflector; Figure 11 yes Figure 10 A schematic diagram of the battery packaging structure after adding a heat insulation pad; Figure 12 yes Figure 7 A schematic diagram of the casing in a battery pack.

[0019] In the diagram, 1 is the housing, 11 is the battery cavity, 2 is the battery cell, 21 is the casing, 211 is the receiving cavity, 22 is the partition, 23 is the electrode assembly, 24 is the cover plate, 25 is the cavity, 3 is the first enclosure, 4 is the second enclosure, 5 is the first seal, 6 is the second seal, 7 is the first cavity, 8 is the second cavity, 9 is the sealing plate, 91 is the inner cavity, 10 is the liquid inlet pipe, 20 is the liquid return pipe, 30 is the guide plate, 31 is the flow channel, 40 is the heat insulation pad, 50 is the insulating component, X is the first direction, Y is the second direction, and Z is the third direction. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in 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 the scope of this utility model.

[0021] A preferred embodiment of the battery pack of this utility model is as follows: Figures 1 to 12 As shown, the battery pack includes a housing 1, a battery cell 2, a first enclosure 3, a second enclosure 4, a first seal 5, and a second seal 6. The housing 1 has a battery cavity 11. The battery cell 2, the first enclosure 3, the second enclosure 4, the first seal 5, and the second seal 6 are all arranged inside the battery cavity 11 of the housing 1. The housing 1 provides protection for the components inside the battery cavity 11.

[0022] The battery pack also has a first direction X, a second direction Y, and a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In this embodiment, the first direction X is the length direction of the battery pack, the second direction Y is the width direction of the battery pack, and the third direction Z is the height direction of the battery pack.

[0023] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, there are multiple battery cells 2, and each battery cell 2 is arranged at intervals along the first direction X within the battery cavity 11. The battery cell 2 includes a housing 21, which is a cuboid in this embodiment.

[0024] like Figure 9 and Figure 10As shown, the first enclosure 3 and the second enclosure 4 are spaced apart along the first direction X, and each battery cell 2 is disposed between the first enclosure 3 and the second enclosure 4. That is, the first enclosure 3 and the second enclosure 4 are located at both ends of the entire battery pack housing 1 along the first direction X. The first enclosure 3 and the housing 21, and the second enclosure 4 and the other housing 21 respectively form a first cavity 7. The first cavity 7 can provide expansion space for the battery cell 2, and can also serve as an air duct or pipe for large-area cooling of the battery cell 2.

[0025] The first sealing element 5 and the second sealing element 6 are spaced apart along the third direction Z. Each adjacent battery cell 2 is connected to a first sealing element 5 and a second sealing element 6. The first sealing element 5, the second sealing element 6, and the adjacent housing 21 form a second cavity 8. That is, the first sealing element 5 and the second sealing element 6 are located at the top and bottom ends of the battery cell 2, respectively, to seal and form the second cavity 8. The second cavity 8 can provide expansion space for the battery cell 2 and can also serve as an air duct or pipe for large-area cooling of the battery cell 2.

[0026] When the first cavity 7 and the second cavity 8 serve as air ducts and pipes to cool the large surface of the battery cell 2, the large surface of the battery cell 2's casing 21 serves as both the encapsulation for the battery cell 2 and the encapsulation for the large surface of the water-cooling pipeline. Both share the same large surface wall thickness, saving nearly half the wall thickness. Furthermore, the large surface of the battery cell 2's casing 21 is typically made of aluminum, with a thermal conductivity of 237 W / mK. It does not require other heat-conducting media for heat transfer, resulting in better heat exchange and enabling higher charge / discharge rates. Compared to the traditional method of arranging water-cooling plates between the battery cells 2, where thermal pads or adhesives are applied for heat conduction, the thermal conductivity of these pads and adhesives is generally between 0.5 W / mK and 6 W / mK, resulting in low thermal conductivity, high cost, and heavy weight.

[0027] The first enclosure 3 and the second enclosure 4 of the battery pack, together with the housing 21, form a first cavity 7. Two adjacent cells 2 along the first direction X are surrounded by a first sealing member 5 and a second sealing member 6 to form a second cavity 8. The first cavity 7 and the second cavity 8 can serve as expansion spaces for the cells 2 and as cooling medium channels 31. The housing 21 is also part of the expansion space and the cooling medium channel 31, sharing the same wall thickness. This saves nearly half of the wall thickness in the first direction X, thus improving the energy density of the battery pack. Furthermore, when the cooling medium flows in the first cavity 7 and the second cavity 8, it directly exchanges heat with the housing 21 without the need for other heat-conducting media to assist in heat transfer. This results in better heat exchange and allows for higher charge and discharge rates.

[0028] In some embodiments, the battery pack further includes a sealing plate 9, an inlet pipe 10, and a return pipe 20. The first cavity 7 and the second cavity 8 are provided with sealing plates 9 at both ends along the second direction Y. The multiple sealing plates 9 respectively seal the first cavity 7 and the second cavity 8. The inlet pipe 10 and the return pipe 20 are provided on both sides of the cell 2 along the second direction Y. The inlet pipe 10 and the return pipe 20 are connected to each of the first cavity 7 and the second cavity 8.

[0029] like Figure 2 , Figure 3 and Figure 5 , Figure 6 As shown, the inlet pipe 10 and the return pipe 20 are both fixedly connected to the sealing plate 9. After the inlet pipe 10 and the return pipe 20 are connected to the first cavity 7 and the second cavity 8, the battery cells 2 of the battery pack are cooled by coolant. The coolant enters the first cavity 7 and the second cavity 8 through the inlet pipe 10 and then flows out through the return pipe 20, forming a water-cooling circuit. The sealing plate 9 is arranged at both ends of the first cavity 7 and the second cavity 8 along the second direction Y, which can seal the first cavity 7 and the second cavity 8 respectively to prevent coolant leakage, and at the same time, it also serves to fix the inlet pipe 10 and the return pipe 20.

[0030] In some embodiments, the sealing plate 9 has an inner cavity 91 that communicates with the first cavity 7 and the second cavity 8, and the inlet pipe 10 and the return pipe 20 are respectively provided with flow ports that communicate with the inner cavity 91.

[0031] like Figure 4 As shown, the inner cavity 91 of the sealing plate 9 connects the first cavity 7, the second cavity 8, and the connecting port. Coolant enters the inner cavity 91 through the flow port of the inlet pipe 10 and then enters the first cavity 7 and the second cavity 8. The inner cavity 91 can temporarily store the coolant and has the function of distributing the coolant, allowing the coolant to enter the first cavity 7 and the second cavity 8 at a uniform speed. In this embodiment, water nozzles are welded to the inlet pipe 10 and the return pipe 20, respectively, and connected to the sealing plate 9.

[0032] In some embodiments, the battery pack further includes a flow guide plate 30. The first cavity 7 and the second cavity 8 are both provided with the flow guide plate 30. A flow channel 31 extending in the second direction Y is formed between the flow guide plate 30 and the housing 21. Multiple flow channels 31 are spaced apart in the third direction Z.

[0033] Multiple guide plates 30 are arranged at intervals along the third direction Z inside the first cavity 7 and the second cavity 8. The guide plates 30 can divide the first cavity 7 and the second cavity 8 to form multiple pipeline branches. After the coolant is diverted by the inner cavity 91, it can enter each pipeline branch evenly, so that the heat exchange of the large surface of the cell 2 is balanced at each position along the third direction Z.

[0034] In some embodiments, the guide plate 30 is a corrugated plate, and the corrugated plate and the housing 21 form a flow channel 31; or, the guide plate 30 is a flat plate, and multiple guide plates 30 are arranged at intervals along the third direction Z, and a flow channel 31 is formed between two adjacent guide plates 30.

[0035] like Figure 8 and Figure 9 As shown, the guide plate 30 is in the form of a corrugated plate or a flat plate. The corrugated plate can increase the surface area of ​​the flow channel 31 and improve the heat exchange efficiency. The flat plate has a simple structure and is easy to weld with the housing 21 of the battery cell 2 to form an integral whole.

[0036] In some embodiments, the battery pack further includes a heat insulation pad 40, and the first cavity 7 and the second cavity 8 are both filled with the heat insulation pad 40.

[0037] like Figure 10 and Figure 11 As shown, the first cavity 7 and the second cavity 8 are filled with heat insulation pads 40. The heat insulation pads 40 can isolate the heat transfer between different battery cells 2, and prevent the heat from being transferred to other battery cells 2 and expanding the range of thermal runaway when one battery cell 2 thermally runs away.

[0038] In some embodiments, the first enclosure 3 and the second enclosure 4 each include a first main body and a first bending portion. The first main body is connected to the first bending portion at both ends along the third direction Z. The first bending portion is welded or bonded to the housing 21. And / or, the first sealing member 5 and the second sealing member 6 each include a second main body and a second bending portion. The second main body is connected to the second bending portion at both ends along the first direction X. The second bending portion is welded or bonded to the housing 21.

[0039] like Figures 9 to 11 As shown, the first bent portions of the first enclosure 3 and the second enclosure 4 are welded or bonded to the housing 21, and the second bent portions of the first sealing member 5 and the second sealing member 6 are welded or bonded to the housing 21. The first bent portions and the second bent portions serve as fixing points and enclose the housing 21 to form the first cavity 7 and the second cavity 8. In one embodiment, the cross-sections of the first enclosure 3 and the second enclosure 4 are both C-shaped, that is, the first main body is connected to a first bent portion at both ends along the third direction Z, and the cross-section of the structure formed by the first main body and the two first bent portions is C-shaped, as shown. Figure 9 As shown. The cross-sections of both the first seal 5 and the second seal 6 are also C-shaped, as shown. Figure 10 and Figure 11 As shown, it will not be elaborated further here.

[0040] In this embodiment, after the first bending part and the second bending part are welded to the housing 21, the first enclosure 3 and the second enclosure 4 form an integral whole with the housing 21 of the battery cell 2. The housing 21 is treated with a fireproof coating and then sent to the battery cell 2 workshop for cleaning before the battery cell 2 can be wound into the housing. After the electrode assembly 23 is connected to the cover plate 24, the cover plate 24 is sealed with the housing 21. An insulating part 50 is provided between the housing 21 and the cover plate 24 to realize the overall assembly of the battery cell 2.

[0041] Multiple cells 2 form an independent integrated whole, with their own thermal management channels such as the first cavity 7 and the second cavity 8. After the cells 2 are assembled, they are sent to the battery pack workshop for assembly. The liquid inlet pipe 10, the liquid return pipe 20, the sealing plate 9 are connected to the shell 21 of the cells 2 to form a liquid cooling system. After assembly, the entire battery pack does not need to stack the cells 2 to form a battery module, nor does it need to set up end plates, side plates, water cooling plates, structural adhesives, buffer pads, heat insulation pads 40, foam, adhesive strips and other structural materials for the battery module. The process of putting the cells 2 into the box is simple.

[0042] In some embodiments, the battery cell 2 further includes a plurality of separators 22, a plurality of electrode assemblies 23 and a cover plate 24. The housing 21 has a receiving cavity 211. The plurality of separators 22 are all disposed in the receiving cavity 211. The plurality of separators 22 are spaced apart along the second direction Y. Each separator 22 divides the receiving cavity 211 into a plurality of cavities 25. Each electrode assembly 23 is disposed in a cavity 25 in a corresponding manner. The cover plate 24 covers the cavity 25.

[0043] In this embodiment, there are multiple cover plates 24. Each cavity 25 of the cell 2, which is separated by the partition plate 22, is equipped with an electrode assembly 23 and a cover plate 24. After the cover plate 24 is fixedly connected to the housing 21, it seals the cavity 25. Each cover plate 24 is provided with an electrode post assembly. The electrode post assembly is electrically connected to the electrode assembly 23. That is, each electrode assembly 23, cover plate 24 and electrode post assembly form a small battery cell. A cell 2 is composed of multiple relatively independent battery cells. Each battery cell shares the entire housing 21.

[0044] like Figure 7 and Figure 12 As shown, the number of cavities 25 within each housing 21 is unlimited, and can be either odd or even, to encapsulate different numbers of small battery cells, depending on the requirements. The housing 21 is divided into multiple cavities 25 for assembling electrode assemblies 23 by a partition 22, and a cover plate 24 seals each cavity 25. Adjacent cavities 25 share a common intermediate sidewall. The same number of electrode assemblies 23 can save half the wall thickness in the second direction Y, saving nearly half of the side wall thickness. The edges of the cavities 25 can be close to right angles, reducing the impact of process radius on the volume of the cavities 25. More cavities 25 can be arranged within the same size, resulting in higher volume utilization and lighter weight.

[0045] In some embodiments, the battery cell 2 further includes an insulating element 50 connected between the housing 21 and the cover plate 24 to provide insulation between the cover plate 24 and the housing 21.

[0046] like Figure 3 As shown, the housing 21 and the cover plate 24 are connected by an insulating pad. The insulating pad can insulate and isolate the cover plate 24 and the housing 21, preventing a short circuit inside the battery cell 2 from causing the housing 21 to become energized, thus improving the insulation and safety of the battery cell 2. In this embodiment, the insulating member 50 is arranged in a ring around the cover plate 24 to ensure the insulation effect.

[0047] In some embodiments, the housing 21 is a one-piece molded structure.

[0048] The shell 21 adopts a one-piece molded structure to ensure the structural strength of the shell 21. In this embodiment, the shell 21 is formed by extrusion process. The four edges of the shell 21 can be extruded in a near right angle manner, without the need for process R angle as required by stretching molding. Compared with the traditional structure, it has a higher volume utilization rate and achieves lightweighting for the same volume.

[0049] This utility model also provides a preferred embodiment of an electrical device, including a battery pack. The specific structure of the battery pack is the same as that of the battery pack described in any of the above embodiments, and will not be repeated here.

[0050] In summary, this utility model provides a battery pack and electrical device, in which the first enclosure, the second enclosure, and the shell respectively form a first cavity. Two adjacent battery cells along the first direction are surrounded by the first sealing member and the second sealing member to form a second cavity. The first cavity and the second cavity can serve as expansion spaces for the battery cells and as cooling medium channels. The shell is also part of the expansion space and the cooling medium channel, sharing the same wall thickness. This saves nearly half of the wall thickness in the first direction, thereby increasing the energy density of the battery pack. Furthermore, when the cooling medium flows in the first cavity and the second cavity, it directly exchanges heat with the shell without the need for other heat-conducting media to assist in heat transfer. This results in better heat exchange and allows for higher charge and discharge rates.

[0051] 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 in that, The battery pack has a first direction, a second direction, and a third direction that are mutually perpendicular to each other. The battery pack includes: The casing includes a battery compartment; Multiple battery cells are disposed in the battery cavity, and the multiple battery cells are spaced apart along the first direction. Each battery cell includes a housing. A first enclosure and a second enclosure are spaced apart along the first direction, and each of the battery cells is disposed between the first enclosure and the second enclosure. The first enclosure and the housing, and the second enclosure and the other housing, respectively form a first cavity. A first seal and a second seal are spaced apart along the third direction. The first seal and the second seal are connected between two adjacent cells. The first seal, the second seal, and the adjacent housing form a second cavity.

2. The battery pack according to claim 1, characterized in that, The battery pack further includes a sealing plate, an inlet pipe, and a return pipe. The sealing plate is provided at both ends of the first cavity along the second direction and at both ends of the second cavity along the second direction. The multiple sealing plates respectively seal the first cavity and the second cavity. The inlet pipe and the return pipe are provided on both sides of the cell along the second direction. The inlet pipe and the return pipe are connected to each of the first cavity and the second cavity.

3. The battery pack according to claim 2, characterized in that, The sealing plate has an inner cavity that communicates with the first cavity and the second cavity. The inlet pipe and the return pipe are respectively provided with flow ports, and the flow ports communicate with the inner cavity.

4. The battery pack according to claim 2, characterized in that, The battery pack also includes a flow guide plate, which is provided in both the first cavity and the second cavity. A flow channel extending along the second direction is formed between the flow guide plate and the housing, and multiple flow channels are spaced apart along the third direction.

5. The battery pack according to claim 4, characterized in that, The guide plate is a corrugated plate, and the corrugated plate and the shell form the flow channel; or, the guide plate is a flat plate, and multiple guide plates are spaced apart along the third direction, with the flow channel formed between two adjacent guide plates.

6. The battery pack according to claim 1, characterized in that, The battery pack also includes a heat insulation pad, which is filled in both the first cavity and the second cavity.

7. The battery pack according to any one of claims 1-6, characterized in that, Both the first enclosure and the second enclosure include a first main body and a first bent portion. The first main body is connected to the first bent portion at both ends along the third direction. The first bent portion is welded or bonded to the shell. And / or, both the first seal and the second seal include a second main body and a second bent portion. The second main body is connected to the second bent portion at both ends along the first direction. The second bent portion is welded or bonded to the shell.

8. The battery pack according to any one of claims 1-6, characterized in that, The battery cell also includes multiple separators, multiple electrode assemblies, and a cover plate. The housing has a receiving cavity, and the multiple separators are disposed in the receiving cavity. The multiple separators are spaced apart along the second direction. Each separator divides the receiving cavity into multiple cavities. Each electrode assembly is disposed in a corresponding cavity. The cover plate seals the cavity.

9. The battery pack according to claim 8, characterized in that, The battery cell also includes an insulating component connected between the housing and the cover plate to provide insulation between the cover plate and the housing.

10. The battery pack according to any one of claims 1-6, characterized in that, The shell is a one-piece molded structure.

11. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-10.

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