Liquid cooling system, battery pack and electric device

Abstract

The application provides a liquid cooling system, a battery pack and a power utilization equipment, relates to the technical field of battery cooling, and the liquid cooling system comprises a liquid cooling bottom plate, a liquid cooling vertical plate and a communication structure; the liquid cooling bottom plate extends along a first direction, the liquid cooling bottom plate is provided with a first flow channel, and the water inlet and the water outlet of the first flow channel are located at the end of the liquid cooling bottom plate; the liquid cooling vertical plate is located above the liquid cooling bottom plate, extends along the first direction, is provided with a second flow channel, and the water inlet and the water outlet of the second flow channel are located at the end of the liquid cooling vertical plate. The liquid cooling system provided by the application can exchange heat at each position on the battery pack, and can avoid uneven heat in the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery cooling technology, and more particularly to a liquid cooling system, a battery pack, and an electrical device. Background Technology

[0002] Battery packs are key components in electric vehicles, energy storage systems, and other devices used to store and supply electrical energy. When operating, battery packs supply power to electrical equipment by transmitting the electrical energy stored within them. However, heat is generated during the storage and release of electrical energy. If this heat cannot be dissipated in a timely manner, it can easily accumulate inside the battery pack.

[0003] To avoid the aforementioned issues, in existing technologies, a liquid cooling plate is typically installed at the bottom of the battery pack. The liquid cooling plate is in close contact with the surface of the battery pack and has multiple flow channels inside. A cooling medium, such as cooling water, circulates within these channels, carrying away the heat generated during the storage and release of electrical energy by the battery pack, thus achieving cooling.

[0004] However, the aforementioned liquid cooling plate causes the temperature at the bottom of the battery pack to be lower than that at the top, resulting in uneven internal temperature and affecting the battery pack's lifespan. Summary of the Invention

[0005] In view of this, this application provides a liquid cooling system that can exchange heat at various points on the battery pack and avoid uneven heat distribution inside the battery pack.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] The first aspect of this application provides a liquid cooling system, including a liquid cooling base plate, a liquid cooling vertical plate, and a connecting structure;

[0008] The liquid-cooled base plate extends along a first direction, and the liquid-cooled base plate is provided with a first flow channel, wherein the inlet and outlet of the first flow channel are located at the ends of the liquid-cooled base plate.

[0009] The liquid-cooled vertical plate is located above the liquid-cooled base plate. The liquid-cooled vertical plate extends along the first direction. The liquid-cooled vertical plate is provided with a second flow channel. The inlet and outlet of the second flow channel are located at the ends of the liquid-cooled vertical plate.

[0010] The connecting structure is connected to the liquid-cooled base plate, the water inlet end of the connecting structure is connected to the water inlet of the first flow channel, and the water outlet end of the connecting structure is connected to the water outlet of the first flow channel.

[0011] The connecting structure connects to the liquid-cooled vertical plate, the water inlet of the connecting structure is connected to the water inlet of the second flow channel, and the water outlet of the connecting structure is connected to the water outlet of the second flow channel.

[0012] In one possible implementation, the liquid-cooled vertical plate has multiple second flow channels, which are sequentially spaced apart along the height direction.

[0013] In one possible implementation, at least two adjacent second channels have different flow directions.

[0014] In one possible implementation, there are multiple liquid-cooled vertical plates, which are arranged at intervals along a second direction, with the first direction being perpendicular to the second direction.

[0015] In one possible implementation, there are multiple first flow channels, and these multiple first flow channels are spaced apart.

[0016] In one possible implementation, at least two adjacent first channels have different flow directions.

[0017] In one possible implementation, the first flow channel includes a plurality of extensions and a plurality of connecting portions, wherein the plurality of extensions are arranged at intervals along a second direction, and the first direction is perpendicular to the second direction;

[0018] The flow directions of two adjacent extensions are different; between two adjacent extensions, the first end of the connecting portion is connected to one of the extensions, and the second end of the connecting portion is connected to the other extension.

[0019] In one possible implementation, in the first direction, the connecting structure is disposed at the end of the liquid-cooled base plate and the liquid-cooled vertical plate;

[0020] The connecting structure is welded to or integrally formed with the end of the liquid-cooled base plate, and the connecting structure is welded to or integrally formed with the end of the liquid-cooled vertical plate.

[0021] A second aspect of this application also provides a battery pack, including the liquid cooling system described above.

[0022] A third aspect of this application also provides an electrical device, including the battery pack described above.

[0023] This application provides a liquid cooling system including a liquid cooling base plate, a liquid cooling vertical plate, and a connecting structure. The liquid cooling base plate is provided with a first flow channel, the liquid cooling vertical plate is provided with a second flow channel, and the connecting structure connects the liquid cooling base plate and the liquid cooling vertical plate respectively, and the connecting structure connects the inlet and outlet of the first flow channel and the second flow channel respectively.

[0024] The liquid-cooled base plate and the liquid-cooled vertical plate together form an accommodating space. The accommodating space is used to accommodate the heating elements inside the battery pack and to fix the heating elements, ensuring that the heating elements remain stable during operation and preventing them from shifting or even colliding due to vibration or other reasons.

[0025] Meanwhile, the liquid-cooled base plate is located at the bottom of the heating element, and a first flow channel is provided inside the liquid-cooled base plate. Cooling water can circulate in the first flow channel through the connecting structure to achieve heat exchange on the bottom of the heating element. The liquid-cooled vertical plate is located on the side of the heating element, and a second flow channel is provided inside the liquid-cooled vertical plate. Cooling water can circulate in the second flow channel through the connecting structure to achieve heat exchange on the side of the heating element.

[0026] Compared to the liquid cooling plate setup in the prior art, the liquid cooling system provided in this application can exchange heat at various points on the battery pack, avoiding uneven heat distribution inside the battery pack. Attached Figure Description

[0027] The specific implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only for illustration and explanation of the embodiments of this application, and the embodiments of this application are not limited to the specific implementation described below.

[0028] Figure 1 This is a schematic diagram of the liquid cooling system provided in an embodiment of this application;

[0029] Figure 2 for Figure 1 Exploded view;

[0030] Figure 3 for Figure 1 Schematic diagram of the structure of the liquid-cooled vertical plate;

[0031] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0032] Figure 5 for Figure 1 Schematic diagram of the structure of the liquid-cooled base plate;

[0033] Figure 6 for Figure 1 A schematic diagram of the interconnected structure.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100-Liquid-cooled base plate;

[0036] 110 - First flow channel;

[0037] 111 - Extension; 112 - Connecting part;

[0038] 200-Liquid-cooled vertical plate;

[0039] 210 - Second flow channel;

[0040] 211 - Inlet; 212 - Outlet;

[0041] 300-connected structure;

[0042] 310 - Inlet nozzle; 320 - Outlet nozzle.

[0043] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the embodiments of this application in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application and how the technical solutions of the embodiments of this application solve the above-mentioned technical problems will be clearly and completely described below with reference to specific embodiments and the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or 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 the embodiments of this application according to the specific circumstances.

[0046] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0047] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0048] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0049] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0050] Battery packs are key components in electric vehicles, energy storage systems, and other devices used to store and supply electrical energy. When operating, battery packs supply power to electrical equipment by transmitting the electrical energy stored within them. However, heat is generated during the storage and release of electrical energy. If this heat cannot be dissipated in a timely manner, it can easily accumulate inside the battery pack.

[0051] To avoid the aforementioned issues, in existing technologies, a liquid cooling plate is typically installed at the bottom of the battery pack. The liquid cooling plate is in close contact with the surface of the battery pack and has multiple flow channels inside. A cooling medium, such as cooling water, circulates within these channels, carrying away the heat generated during the storage and release of electrical energy by the battery pack, thus achieving cooling.

[0052] However, the aforementioned liquid cooling plate causes the temperature at the bottom of the battery pack to be lower than that at the top, resulting in uneven internal temperature and affecting the battery pack's lifespan.

[0053] Based on this, the present application provides a liquid cooling system including a liquid cooling base plate, a liquid cooling vertical plate, and a connecting structure. The liquid cooling base plate is provided with a first flow channel, the liquid cooling vertical plate is provided with a second flow channel, and the connecting structure connects the liquid cooling base plate and the liquid cooling vertical plate respectively, and the connecting structure connects the inlet and outlet of the first flow channel and the second flow channel respectively.

[0054] The liquid-cooled base plate and the liquid-cooled vertical plate together form an accommodating space. The accommodating space is used to accommodate the heating element inside the battery pack and to fix the heating element, ensuring that the heating element remains stable during operation and preventing the heating element from shifting or even colliding due to vibration or other reasons.

[0055] The liquid-cooled base plate is located at the bottom of the heating element, and a first flow channel is provided inside the liquid-cooled base plate. Cooling water can circulate in the first flow channel through the connecting structure to achieve heat exchange on the bottom of the heating element. The liquid-cooled vertical plate is located on the side of the heating element, and a second flow channel is provided inside the liquid-cooled vertical plate. Cooling water can circulate in the second flow channel through the connecting structure to achieve heat exchange on the side of the heating element.

[0056] Compared to the liquid cooling plate setup in the prior art, the liquid cooling system provided in this application can exchange heat at various points on the battery pack, avoiding uneven heat distribution inside the battery pack.

[0057] The technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0058] Reference Figures 1 to 6 As shown in the figure, this application provides a liquid cooling system, including a liquid cooling base plate 100, a liquid cooling vertical plate 200, and a connecting structure 300.

[0059] The liquid-cooled base plate 100 and the liquid-cooled vertical plate 200, collectively referred to as cold plates, are generally made of high thermal conductivity metals such as copper and aluminum, and can serve as a bridge for heat exchange between the heating element and the cooling water.

[0060] During the storage and release of electrical energy, the heat-generating elements of the battery pack generate heat. The heat is first transferred to the liquid-cooled base plate 100 and the liquid-cooled vertical plate 200, and then carried away by the cooling water circulating in the internal channels of the liquid-cooled base plate 100 and the liquid-cooled vertical plate 200, thereby cooling the heat-generating elements.

[0061] Liquid-cooled base plate 100 along the first direction (reference) Figure 1 Extending in the X direction, the liquid-cooled base plate 100 is provided with a first flow channel 110, and the inlet 310 and outlet 320 of the first flow channel 110 are located at the end of the liquid-cooled base plate 100; the liquid-cooled vertical plate 200 is located above the liquid-cooled base plate 100, and the liquid-cooled vertical plate 200 extends along the first direction, and the liquid-cooled vertical plate 200 is provided with a second flow channel 210, and the inlet 211 and outlet 212 of the second flow channel 210 are located at the end of the liquid-cooled vertical plate 200; The through structure 300 is connected to the liquid-cooled base plate 100. The water inlet end of the through structure 300 is connected to the water inlet 310 of the first flow channel 110, and the water outlet end of the through structure 300 is connected to the water outlet 320 of the first flow channel 110. The through structure 300 is connected to the liquid-cooled vertical plate 200. The water inlet end of the through structure 300 is connected to the water inlet 211 of the second flow channel 210, and the water outlet end of the through structure 300 is connected to the water outlet 212 of the second flow channel 210.

[0062] In practice, the liquid-cooled base plate 100 and the liquid-cooled vertical plate 200 together form a housing space. The housing space is used to house the heating element and to fix the heating element, ensuring that the heating element remains stable during operation and preventing the heating element from shifting or even colliding due to vibration or other reasons.

[0063] Meanwhile, the liquid-cooled base plate 100 is located at the bottom of the heating element, and a first flow channel 110 is provided inside the liquid-cooled base plate 100. Cooling water can circulate within the first flow channel 110 through the connecting structure 300 to achieve heat exchange with the bottom of the heating element. The liquid-cooled vertical plate 200 is located on the side of the heating element, and a second flow channel 210 is provided inside the liquid-cooled vertical plate 200. Cooling water can circulate within the second flow channel 210 through the connecting structure 300 to achieve heat exchange with the side of the heating element.

[0064] Compared to the liquid cooling plate setup in the prior art, the liquid cooling system provided in this application can exchange heat at various points on the battery pack, avoiding uneven heat distribution inside the battery pack.

[0065] Reference Figures 2 to 4 , Figure 6 As shown, in some embodiments, there are multiple second flow channels 210 in the liquid-cooled vertical plate 200, and the multiple second flow channels 210 are arranged at intervals along the height direction.

[0066] In a specific implementation, the number of second flow channels 210 is set to multiple, and the multiple second flow channels 210 are arranged sequentially at intervals along the height direction of the liquid cooling vertical plate 200 and are parallel to each other; the arrangement of multiple second flow channels 210 enables the cooling water circulation path to cover the interior of the liquid cooling vertical plate 200, which improves the heat exchange efficiency between the cooling water and the heating element, while ensuring that the heat is uniform on all sides of the heating element.

[0067] Specifically, in the above embodiments, each of the second flow channels 210 is independent of each other and not connected to each other, so as to ensure that the heat exchange efficiency of each of the second flow channels 210 is the same, and further ensure the uniformity of heat on all sides of the heating element.

[0068] Reference Figures 2 to 4 , Figure 6 As shown, further, in some embodiments, in the plurality of second channels 210, at least two adjacent second channels 210 have different flow directions.

[0069] Because the cooling water in the cooling vertical plate 200 increases in temperature after exchanging heat with the heating element, the efficiency of subsequent heat exchange between the cooling water and the heating element decreases. Therefore, the unidirectional flow of the second flow channel 210 will cause uneven temperature at both ends of the side of the heating element. That is, the temperature of the heating element at the inlet 211 of the second flow channel 210 is lower than the temperature of the heating element at the outlet 212 of the second flow channel 210.

[0070] To avoid the above situation, in the above embodiment, at least two adjacent second flow channels 210 are set to have different flow directions to ensure that the heat is uniform on all sides of the heating element; of course, the specific flow direction of the cooling water in each second flow channel 210 can be selected by the operator according to actual needs, which will not be described in detail here.

[0071] Reference Figures 1 to 4 As shown, in some embodiments, there are multiple liquid-cooled vertical plates 200, and the multiple liquid-cooled vertical plates 200 are arranged along the second direction (reference). Figure 1 The Y-direction is set sequentially at intervals, with the first direction and the second direction set perpendicular to each other.

[0072] In a practical implementation, the liquid-cooled base plate 100 and two adjacent liquid-cooled vertical plates 200 together form an accommodating space, which is used to accommodate the heating element and to fix the heating element.

[0073] Meanwhile, the two adjacent liquid-cooled vertical plates 200 can exchange heat between the two sides of the heating element along the second direction, improving the heat exchange efficiency between the cooling water and the heating element while ensuring uniform heat distribution on all sides of the heating element.

[0074] Reference Figure 2 and Figure 5 As shown, in some embodiments, there are multiple first flow channels 110, and the multiple first flow channels 110 are arranged at intervals.

[0075] Similarly, the number of the first flow channels 110 is set to be multiple, and the plurality of first flow channels 110 are arranged at intervals and parallel to each other; the arrangement of the plurality of first flow channels 110 enables the cooling water circulation flow path to cover the entire surface of the liquid-cooled base plate 100, which improves the heat exchange efficiency between the cooling water and the heating element while ensuring uniform heat at all positions on the bottom of the heating element.

[0076] Meanwhile, specifically, in the above-mentioned embodiments, the respective first flow channels 110 are independent of each other and not communicated with each other, so as to ensure that the heat exchange efficiency of each first flow channel 110 is the same, which further ensures uniform heat at all positions on the side of the heating element.

[0077] With reference to Figure 2 and Figure 5 shown, further, in some embodiments, among the plurality of first flow channels 110, at least two adjacent first flow channels 110 have different flow directions.

[0078] Similarly, the first flow channels 110 with a single flow direction will cause uneven temperatures at both ends of the side of the heating element, that is, the temperature of the heating element at the water inlet nozzle 310 of the first flow channel 110 is lower than the temperature of the heating element at the water outlet nozzle 320 of the first flow channel 110.

[0079] To avoid the occurrence of the above situation, in the above-mentioned embodiments, it is set that at least two adjacent first flow channels 110 have different flow directions, so as to ensure uniform heat at all positions on the bottom of the heating element; of course, for the specific flow direction of the cooling water in each first flow channel 110, operators can select it according to actual needs, which will not be elaborated one by one here.

[0080] With reference to Figure 2 and Figure 5 shown, further, in some embodiments, the first flow channel 110 includes a plurality of extension portions 111 and a plurality of connection portions 112, the plurality of extension portions 111 are arranged at intervals in sequence along the second direction, and the first direction is perpendicular to the second direction; the flow directions of two adjacent extension portions 111 are different; between two adjacent extension portions 111, a first end of the connection portion 112 is connected to one of the extension portions 111, and a second end of the connection portion 112 is connected to the other extension portion 111.

[0081] In the above-mentioned embodiments, the first flow channel 110 specifically adopts a "several"-shaped water channel, and a plurality of connection portions 112 in a bent form are arranged between the head end and the tail end; the "several"-shaped water channel increases the contact area between the heating element and the liquid cooling system, improves the heat exchange efficiency between the heating element and the cooling water, and at the same time ensures the temperature uniformity of the bottom of the heating element.

[0082] With reference to Figure 1 and Figure 6As shown, in some embodiments, in the first direction, the connecting structure 300 is disposed at the end of the liquid-cooled base plate 100 and the liquid-cooled vertical plate 200; the connecting structure 300 is welded and fixed to the end of the liquid-cooled base plate 100 or integrally formed, and the connecting structure 300 is welded and fixed to the end of the liquid-cooled vertical plate 200 or integrally formed.

[0083] In practice, the connecting structure 300 is connected to the liquid-cooled base plate 100 and the liquid-cooled vertical plate 200 by welding or riveting; the liquid-cooled base plate 100 and the liquid-cooled vertical plate 200 are combined by solid-phase diffusion welding, instantaneous liquid-phase diffusion welding or friction stir welding to improve the connection strength between the components in the liquid cooling system.

[0084] This application also provides a battery pack, including the liquid cooling system described in the above embodiments.

[0085] The liquid cooling system in this application embodiment has the same structure as the liquid cooling system provided in any of the above embodiments and can bring the same or similar technical effects. It will not be described in detail here, but can be referred to the description of the above embodiments.

[0086] This application also provides an electrical device, including the battery pack described in the above embodiments.

[0087] The battery pack in this application embodiment has the same structure as the battery pack provided in the above embodiments and can bring the same or similar technical effects. It will not be described in detail here. For details, please refer to the description of the above embodiments.

[0088] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the embodiments of this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in the embodiments of this application can be achieved, and this document does not impose any restrictions.

[0089] The specific embodiments described above do not constitute a limitation on the scope of protection of the embodiments of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the principles of the embodiments of this application should be included within the scope of protection of the embodiments of this application.

Claims

1. A liquid cooling system, characterized in that, It includes a liquid-cooled base plate (100), a liquid-cooled vertical plate (200), and a connecting structure (300). The liquid-cooled base plate (100) extends along a first direction, and the liquid-cooled base plate (100) is provided with a first flow channel (110), and the inlet (310) and outlet (320) of the first flow channel (110) are located at the ends of the liquid-cooled base plate (100); The liquid-cooled vertical plate (200) is located above the liquid-cooled base plate (100), the liquid-cooled vertical plate (200) extends along the first direction, the liquid-cooled vertical plate (200) is provided with a second flow channel (210), the inlet (211) and outlet (212) of the second flow channel (210) are located at the ends of the liquid-cooled vertical plate (200); The connecting structure (300) is connected to the liquid-cooled base plate (100). The water inlet end of the connecting structure (300) is connected to the water inlet (310) of the first flow channel (110), and the water outlet end of the connecting structure (300) is connected to the water outlet (320) of the first flow channel (110). The connecting structure (300) is connected to the liquid-cooled vertical plate (200). The water inlet end of the connecting structure (300) is connected to the water inlet (211) of the second flow channel (210), and the water outlet end of the connecting structure (300) is connected to the water outlet (212) of the second flow channel (210).

2. The liquid cooling system according to claim 1, characterized in that, In the liquid-cooled vertical plate (200), there are multiple second flow channels (210), and the multiple second flow channels (210) are arranged at intervals along the height direction.

3. The liquid cooling system according to claim 2, characterized in that, In the plurality of second flow channels (210), at least two adjacent second flow channels (210) have different flow directions.

4. The liquid cooling system according to claim 1, characterized in that, The number of liquid-cooled vertical plates (200) is multiple, and the multiple liquid-cooled vertical plates (200) are arranged at intervals along the second direction, with the first direction being perpendicular to the second direction.

5. The liquid cooling system according to claim 1, characterized in that, The number of the first flow channels (110) is multiple, and the multiple first flow channels (110) are arranged at intervals.

6. The liquid cooling system according to claim 5, characterized in that, In the plurality of first flow channels (110), at least two adjacent first flow channels (110) have different flow directions.

7. The liquid cooling system according to claim 5, characterized in that, The first flow channel (110) includes a plurality of extensions (111) and a plurality of connecting portions (112), wherein the plurality of extensions (111) are arranged at intervals along a second direction, and the first direction is perpendicular to the second direction; The flow directions of two adjacent extensions (111) are different; between two adjacent extensions (111), the first end of the connecting part (112) is connected to one of the extensions (111), and the second end of the connecting part (112) is connected to the other extension (111).

8. The liquid cooling system according to claim 1, characterized in that, In the first direction, the connecting structure (300) is disposed at the ends of the liquid-cooled base plate (100) and the liquid-cooled vertical plate (200); The connecting structure (300) is welded to the end of the liquid-cooled base plate (100) or integrally formed, and the connecting structure (300) is welded to the end of the liquid-cooled vertical plate (200) or integrally formed.

9. A battery pack, characterized in that, Includes the liquid cooling system as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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