Battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack and electric equipment.The battery pack comprises a box body, a cover body, a plurality of single batteries, an electrical isolation plate, a temperature sensor and a pressing plate, the box body is provided with a containing cavity, the cover body is connected to the box body and covers the containing cavity, and the single batteries are arranged in the containing cavity; the electrical isolation plate is located on the side, facing the cover body, of the battery single body and connected with the box body, the temperature sensor is arranged between the battery single body and the electrical isolation plate, connected with the side, facing the cover body, of the battery single body and located on the side, facing the cover body, of the battery single body, and the pressing plate is connected with the electrical isolation plate in the second direction. The pressing plate is recessed in the third direction to form a pressing groove, a groove opening of the pressing groove faces the single batteries, and at least part of the temperature sensor is arranged in the pressing groove. According to the battery pack and the electric equipment disclosed by the invention, the problem of unstable temperature signal acquisition caused by unstable connection between the temperature sensor and the battery monomers is solved or improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to battery packs and electrical equipment. Background Technology

[0002] With the rapid development of electric vehicles, renewable energy storage systems, and other electrical devices, the demand for high-performance battery packs is increasing. Battery packs contain multiple energy sources for these devices, and optimizing their design and manufacturing is crucial for improving overall performance.

[0003] During charging and discharging, the temperature of the individual battery cells within the battery pack rises. Excessive temperature can cause these cells to catch fire, leading to an accident. Therefore, real-time monitoring of the individual battery cell temperature is necessary.

[0004] In related technologies, structural adhesive is usually used to bond temperature sensors to battery cells. However, when electrical equipment is in operation, it vibrates, and the battery pack vibrates as well. This can easily cause the structural adhesive to detach from the temperature sensor, making it impossible for the temperature sensor to make stable contact with the battery cells, resulting in unstable temperature signal acquisition. Utility Model Content

[0005] In view of this, this application provides a battery pack and electrical equipment to solve or improve the problem of unstable temperature signal acquisition caused by the loose connection between the temperature sensor and the battery cell.

[0006] In a first aspect, this application provides a battery pack having intersecting second and third directions, including:

[0007] The enclosure has a receiving cavity;

[0008] The lid is connected to the box body and seals the receiving cavity;

[0009] Multiple battery cells are housed within the receiving cavity;

[0010] An electrical isolation plate is located on the side of the battery cell facing the cover and is connected to the casing.

[0011] A temperature sensor is positioned between the battery cell and the electrical isolation plate along a third direction, and is connected to the side of the battery cell facing the cover.

[0012] A pressure plate is located on the side of the battery cell facing the cover, and the pressure plate is connected to the electrical isolation plate along the second direction. The pressure plate is recessed along the third direction to form a pressure groove, and the opening of the pressure groove faces the battery cell. The temperature sensor is at least partially disposed in the pressure groove.

[0013] Beneficial effects: A pressure plate is installed on the electrical isolation plate, with a groove formed by a third-direction indentation. The groove opening faces the battery cell. The temperature sensor is at least partially installed within the groove. The groove serves two purposes: first, it restricts the movement of the temperature sensor, positioning it on the battery cell to detect the temperature at a specific location, thus improving the accuracy of temperature measurement; second, the bottom of the groove provides pressure to the temperature sensor, pressing it firmly against the battery cell, improving the stability of temperature acquisition and preventing inaccurate temperature data due to unstable contact between the temperature sensor and the battery cell when the battery pack vibrates.

[0014] The pressure plate is set on the electrical isolation plate, which makes the connection convenient and the structure has a strong overall integrity.

[0015] In one alternative embodiment, the battery pack has a first direction that intersects both the second direction and the third direction, and the electrical isolation plate includes a base portion and a first connecting portion extending along the first direction, the first connecting portion being connected to the base portion, and a pressure plate being connected to one side of the first connecting portion along the second direction.

[0016] In one alternative embodiment, the first connecting portion includes a protruding section and a recessed section, the protruding section and the recessed section extending along a third direction, the protruding section and the recessed section being alternately connected along a first direction, the protruding section or the recessed section being connected to the base portion, and the pressure plate being connected to the recessed section along a second direction.

[0017] In one alternative embodiment, the battery pack further includes a reinforcing plate, one end of which is connected to the recessed section along the second direction, and the other end of which is connected to the pressure plate along the first direction.

[0018] In one alternative embodiment, the electrical isolation plate has a through hole located between the protruding section and the pressure plate along the second direction.

[0019] In one optional embodiment, multiple pressure plates and reinforcing plates are provided, with the multiple pressure plates arranged at intervals along a first direction, and each reinforcing plate connected to the recessed section on one side along a second direction and connected to the pressure plate on one side along the first direction.

[0020] And / or, multiple pressure plates and reinforcing plates are provided, with multiple pressure plates arranged at intervals along the second direction, and each reinforcing plate connected to the recessed section on one side along the second direction and connected to the pressure plate on one side along the first direction.

[0021] In one alternative implementation, the electrical isolation plate, pressure plate, and reinforcing plate are integrally formed.

[0022] In one alternative embodiment, the battery pack further includes an elastic element disposed within a pressure groove, with one end of the elastic element connected to the bottom of the pressure groove and the other end connected to a temperature sensor.

[0023] In one alternative embodiment, the pressure plate is provided with an observation port through it in a third direction, and the observation port is connected to the pressure groove.

[0024] In one optional implementation, the height of the protrusion along the third direction is H1, and the height of the groove along the third direction is H2, satisfying: H1 = H2.

[0025] Secondly, this application also provides an electrical device, including a battery pack.

[0026] The electrical equipment provided in this application includes a battery pack, and therefore incorporates all the advantages of the battery pack mentioned above. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of a battery pack with the cover removed according to an embodiment of this application;

[0030] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0031] Figure 4 This is a schematic diagram of a battery pack structure with the cover and battery pack removed according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the structure of an electrical isolation plate in a battery pack according to an embodiment of this application;

[0033] Figure 6 for Figure 5 A magnified view of part B in the diagram.

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

[0035] 1. Housing; 101. Receiving cavity; 102. Frame; 103. Base plate; 2. Cover; 3. Battery cell; 300. Battery pack; 4. Electrical isolation plate; 401. Base part; 402. First connecting part; 4021. Protruding section; 4022. Recessed section; 403. Second connecting part; 5. Pressure plate; 501. Pressure groove; 6. Reinforcing plate; 7. Through hole; 8. Observation port; 9. Mounting groove; 10. Busbar; 11. Temperature sensor; 12. Elastic element; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only 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.

[0037] 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 used 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 features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] 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.

[0039] 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.

[0040] When monitoring the temperature of individual battery cells, structural adhesive is typically used to bond the temperature sensor to the cell. However, the electrical equipment vibrates during operation, causing the battery pack to vibrate as well. This can easily lead to the adhesive detaching from the temperature sensor, resulting in unstable contact between the sensor and the battery cell and unstable temperature signal acquisition. To address or improve the problem of unstable temperature signal acquisition due to a loose connection between the temperature sensor and the battery cell, this application provides a battery pack and an electrical device.

[0041] The following is combined with Figures 1 to 6 This describes an embodiment of the present application.

[0042] According to embodiments of this application, in one aspect, a battery pack is provided, including a housing 1, a cover 2, multiple battery cells 3, an electrical isolation plate 4, a temperature sensor 11, and a pressure plate 5. For example... Figure 1 As shown, the battery pack has a first direction X, a second direction Y, and a third direction Z that intersect each other in pairs, and the three directions are perpendicular to each other or form a certain angle.

[0043] Specifically, the housing 1 has a receiving cavity 101, the cover 2 is connected to the housing 1 and covers the receiving cavity 101, multiple battery cells 3 are disposed in the receiving cavity 101, the electrical isolation plate 4 is located on the side of the battery cells 3 facing the cover 2 and is connected to the housing 1, and is used to press the multiple battery cells 3. Along the third direction Z, the temperature sensor 11 is disposed between the battery cells 3 and the electrical isolation plate 4 and is connected to the side of the battery cells 3 facing the cover 2, the pressure plate 5 is located on the side of the battery cells 3 facing the cover 2, and the pressure plate 5 is connected to the electrical isolation plate 4 along the second direction Y, the pressure plate 5 is recessed along the third direction Z to form a pressure groove 501, the groove opening of the pressure groove 501 faces the battery cells 3, and the temperature sensor 11 is at least partially disposed in the pressure groove 501, and is used to position the temperature sensor 11 on the battery cells 3.

[0044] like Figures 5 to 6As shown, a pressure plate 5 is provided on the electrical isolation plate 4. The pressure plate 5 is recessed along the third direction Z to form a pressure groove 501. The opening of the pressure groove 501 faces the battery cell 3. The temperature sensor 11 is installed in the pressure groove 501. The pressure groove 501 has two functions: First, the pressure groove 501 can restrict the movement of the temperature sensor 11 and position the temperature sensor 11 on the battery cell 3 to detect the temperature at a specific location on the battery cell 3, thereby improving the accuracy of temperature measurement. Second, the bottom of the pressure groove 501 provides pressure to the temperature sensor 11, pressing the temperature sensor 11 firmly onto the battery cell 3, improving the stability of temperature acquisition, and preventing unstable contact between the temperature sensor 11 and the battery cell 3 when the battery pack vibrates, which could lead to inaccurate temperature acquisition information.

[0045] Specifically, the housing 1 includes a frame 102 and a bottom plate 103 connected together. The frame 102 and the bottom plate 103 enclose a cavity 101. The cover 2 is connected to the side of the frame 102 away from the bottom plate 103.

[0046] The pressure plate 5 is set on the electrical isolation plate 4, which is convenient to connect and has a strong overall structure.

[0047] Specifically, such as Figure 2 As shown, multiple battery cells 3 are arranged in multiple rows in the first direction X and multiple rows in the second direction Y to form a battery pack 300. Adjacent rows of battery cells 3 are interconnected, and within a single row, adjacent battery cells 3 are interconnected. The multiple battery cells 3 are connected in series and installed within a receiving cavity 101. A cover 2 is placed over the receiving cavity 101 to seal it, protecting the battery pack 300 and preventing external impurities and moisture from affecting it.

[0048] Specifically, the temperature sensor 11 is an NTC thermistor. NTC thermistors are very sensitive to temperature changes; even a small temperature change can cause a significant change in resistance. NTC thermistors can measure the temperature of various environments and convert the temperature signal into an electrical signal for transmission and processing. In a temperature control system, the NTC thermistor can serve as the temperature sensor 11 to detect and control the temperature of the equipment in real time, ensuring that the equipment operates within a safe and efficient temperature range.

[0049] Specifically, the material of the electrical isolation plate 4 can be polyurethane, fiberglass, or epoxy resin. The material of the electrical isolation plate 4 has properties such as insulation, high temperature resistance, and corrosion resistance.

[0050] Optionally, the first direction X and the second direction Y are the length and width directions of the battery pack, respectively, and the third direction Z is the thickness direction of the battery pack.

[0051] In one embodiment, the electrical isolation plate 4 includes a base portion 401 and a first connecting portion 402 extending along a first direction X. The first connecting portion 402 is connected to the base portion 401, and a pressure plate 5 is connected to one side of the first connecting portion 402 along a second direction Y. The first connecting portion 402 presses onto a plurality of battery cells 3 to maintain the stability of the plurality of battery cells 3.

[0052] In one embodiment, the first connecting portion 402 includes a protruding section 4021 and a recessed section 4022, which extend along a third direction Z. The protruding section 4021 and the recessed section 4022 are alternately connected along a first direction X. The protruding section 4021 or the recessed section 4022 is connected to the base portion 401, and the pressure plate 5 is connected to the recessed section 4022 along a second direction Y. The protruding section 4021 and the recessed section 4022 facilitate the flow of glue when the receiving cavity 101 is filled with glue, so that the entire receiving cavity 101 is filled with glue.

[0053] In one embodiment, such as Figure 6 As shown, it also includes a reinforcing plate 6. One end of the reinforcing plate 6 along the second direction Y is connected to the recessed section 4022, and one end of the reinforcing plate 6 along the first direction X is connected to the pressure plate 5. The reinforcing plate 6 is used to connect the pressure plate 5 and the electrical isolation plate 4, while increasing the strength of the pressure plate 5 and providing stable pressure to the temperature sensor 11. The reinforcing plate 6 also improves the overall strength of the electrical isolation plate 4. The reinforcing plate 6 also acts as a pressure cap for the battery cell 3, ensuring the stability of the battery cell 3.

[0054] In one embodiment, the electrical isolation plate 4 has a through hole 7 located between the protruding section 4021 and the pressure plate 5 along the second direction Y. The through hole 7 facilitates the flow of glue during the filling of the receiving cavity 101, allowing the entire receiving cavity 101 to be filled with glue.

[0055] In some cases, the through holes 7 on the electrical isolation plate 4 can also save on the use of materials, and at the same time, the condition of the battery cells 3 can be observed through the through holes 7.

[0056] like Figure 6 As shown, the through holes 7 on the electrical isolation plate 4 can also enhance its mechanical strength to a certain extent. By rationally designing the number and distribution of the through holes 7, the vibration resistance and tensile strength of the electrical isolation plate 4 can be improved, thereby avoiding damage caused by external forces during use.

[0057] In one embodiment, multiple pressure plates 5 and reinforcing plates 6 are provided. Multiple pressure plates 5 are arranged at intervals along the first direction X. The pressure plates 5 are connected to the recessed section 4022 along the second direction Y. Each reinforcing plate 6 is connected to the recessed section 4022 on one side along the second direction Y and to the pressure plate 5 on one side along the first direction X.

[0058] And / or, multiple pressure plates 5 and reinforcing plates 6 are provided. Multiple pressure plates 5 are arranged at intervals along the second direction Y. The pressure plates 5 are connected to the recessed section 4022 along the second direction Y. Each reinforcing plate 6 is connected to the recessed section 4022 on one side along the second direction Y and to the pressure plate 5 on one side along the first direction X.

[0059] like Figure 5 As shown, the pressure plate 5 and the reinforcing plate 6 can be spaced apart along the first direction X on the electrical isolation plate 4 to position and press the temperature sensor 11 used to detect the battery cell 3 in the first direction X. They can also be spaced apart along the second direction Y on the electrical isolation plate 4 to position and press the temperature sensor 11 used to detect the battery cell 3 in the second direction Y.

[0060] like Figure 5 As shown, when multiple pressure plates 5 and reinforcing plates 6 are provided along the first direction X and the second direction Y, they can be arranged in a rectangular array, enabling temperature detection at different positions of the battery pack 300, providing overall temperature detection of the battery pack 300, and improving the safety of the battery pack 300 during use.

[0061] In one embodiment, such as Figure 5 As shown, the electrical isolation plate 4, pressure plate 5, and reinforcing plate 6 are integrally molded structures. This integral molding structure can withstand greater mechanical stress and pressure, thereby extending the service life of the electrical isolation plate 4, pressure plate 5, and reinforcing plate 6. Furthermore, the integral molding process reduces the assembly of multiple components, lowers production costs, and improves production efficiency.

[0062] In one embodiment, such as Figure 6 As shown, the battery pack also includes an elastic element 12, which is disposed in the pressure groove 501 along the third direction Z. One end of the elastic element 12 is connected to the bottom of the pressure groove 501, and the other end is connected to the temperature sensor 11. Furthermore, the other end of the elastic element 12 presses against the temperature sensor 11.

[0063] The elastic element 12 can be selected from foam, elastic rubber, or an insulating spring. Taking foam as an example, the foam is installed in the pressure groove 501. With the height of the pressure groove 501 fixed, the height of the pressure groove 501 can be adapted by adjusting the thickness of the foam. One side of the foam abuts against the bottom of the pressure groove 501, and the other side presses the temperature sensor 11 tightly onto the battery cell 3, preventing unstable contact between the temperature sensor 11 and the battery cell 3. At the same time, it has a protective effect on the temperature sensor 11, avoiding direct contact and collision with the pressure groove 501 during vibration and thus preventing damage.

[0064] It should be explained that an insulating spring includes a spring and an insulating material wrapped around the spring. The insulating material can be rubber or plastic.

[0065] In one embodiment, such as Figure 6 As shown, the pressure plate 5 has an observation port 8 extending through it in the third direction Z, and the observation port 8 is connected to the pressure groove 501. Through the observation port 8, the positions of the elastic element 12 and the temperature sensor 11 can be observed. When the detection value of the temperature sensor 11 is abnormal, the position and compression between the temperature sensor 11 and the battery cell 3 can be directly observed through the observation port 8, which is more convenient. At the same time, when the elastic element 12 needs to be replaced, it can be replaced directly through the observation port 8, which is also more convenient.

[0066] In one embodiment, such as Figure 5 As shown, the electrical isolation plate 4 also includes multiple second connecting portions 403, and multiple first connecting portions 402 are provided. The multiple first connecting portions 402 are arranged at intervals along the second direction Y. The second connecting portions 403 are connected between the recessed sections 4022 of two adjacent first connecting portions 402. The second connecting portions 403 are connected to the first connecting portions 402, which can improve the overall strength of the electrical isolation plate 4, and the second connecting portions 403 can press the battery cells 3 together, improving the stability of the battery pack 300 installation.

[0067] Specifically, the second connecting part 403 is a long strip structure and is connected to the recessed section 4022 of the first connecting part 402.

[0068] In one embodiment, the base portion 401 is provided with a mounting groove 9 for mounting the busbar 10.

[0069] Specifically, the bottom of the mounting slot 9 is provided with a perforation, and the busbar 10 is a bar plate. One end of the bar plate is connected to the battery cell 3 below the mounting slot 9 through the perforation.

[0070] In one embodiment, such as Figure 6 As shown, the height of the protruding section 4021 along the third direction Z is H1, and the height of the pressing groove 501 along the third direction Z is H2, satisfying: H1=H2. This facilitates one-piece molding processing.

[0071] This application also provides an electrical device in its embodiments.

[0072] Specifically, electrical equipment includes battery packs as described above.

[0073] It should be noted that the electrical equipment includes the battery pack provided in the embodiments of this application, and therefore also includes all the advantages of the battery pack mentioned above, so it will not be described again.

[0074] Additionally, it should be noted that electrical equipment includes, but is not limited to, electric vehicles and renewable energy storage systems.

[0075] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended application.

Claims

1. A battery pack having intersecting second direction (Y) and third direction (Z), characterized in that, include: The housing (1) has a receiving cavity (101); A cover (2) is connected to the box (1) and the cover (2) covers the receiving cavity (101); Multiple battery cells (3) are disposed within the receiving cavity (101); An electrical isolation plate (4) is located on the side of the battery cell (3) facing the cover (2) and is connected to the housing (1); Temperature sensor (11), along the third direction (Z), the temperature sensor (11) is disposed between the battery cell (3) and the electrical isolation plate (4), and is connected to the side of the battery cell (3) facing the cover (2); A pressure plate (5) is located on the side of the battery cell (3) facing the cover (2), and the pressure plate (5) is connected to the electrical isolation plate (4) along the second direction (Y). The pressure plate (5) is recessed along the third direction (Z) to form a pressure groove (501). The opening of the pressure groove (501) faces the battery cell (3), and the temperature sensor (11) is at least partially disposed in the pressure groove (501).

2. The battery pack according to claim 1, characterized in that, The battery pack has a first direction (X) that intersects the second direction (Y) and the third direction (Z) in pairs. The electrical isolation plate (4) includes a base portion (401) and a first connecting portion (402) extending along the first direction (X). The first connecting portion (402) is connected to the base portion (401). The pressure plate (5) is connected to one side of the first connecting portion (402) along the second direction (Y).

3. The battery pack according to claim 2, characterized in that, The first connecting portion (402) includes a protruding section (4021) and a recessed section (4022), the protruding section (4021) and the recessed section (4022) extending along the third direction (Z), the protruding section (4021) and the recessed section (4022) being alternately connected along the first direction (X), the protruding section (4021) or the recessed section (4022) being connected to the base portion (401), and the pressure plate (5) being connected to the recessed section (4022) along the second direction (Y).

4. The battery pack according to claim 3, characterized in that, The battery pack also includes a reinforcing plate (6), one end of which is connected to the recessed section (4022) along the second direction (Y), and the other end of which is connected to the pressure plate (5) along the first direction (X).

5. The battery pack according to claim 4, characterized in that, The electrical isolation plate (4) has a through hole (7) located between the protruding section (4021) and the pressure plate (5) along the second direction (Y).

6. The battery pack according to claim 5, characterized in that, The pressure plate (5) and the reinforcing plate (6) are both provided in multiples. The multiple pressure plates (5) are arranged at intervals along the first direction (X). Each reinforcing plate (6) is connected to the recessed section (4022) on one side along the second direction (Y) and to the pressure plate (5) on one side along the first direction (X). And / or, both the pressure plate (5) and the reinforcing plate (6) are provided in multiples, the multiple pressure plates (5) are arranged at intervals along the second direction (Y), and each reinforcing plate (6) is connected to the recessed section (4022) on one side along the second direction (Y) and connected to the pressure plate (5) on one side along the first direction (X).

7. The battery pack according to claim 4, characterized in that, The electrical isolation plate (4), the pressure plate (5), and the reinforcing plate (6) are integrally formed structures.

8. The battery pack according to claim 1, characterized in that, The battery pack also includes an elastic element (12), which is disposed in the pressure groove (501) along the third direction (Z). One end of the elastic element (12) is connected to the bottom of the pressure groove (501), and the other end is connected to the temperature sensor (11).

9. The battery pack according to claim 1, characterized in that, The pressure plate (5) is provided with an observation port (8) through it in the third direction (Z), and the observation port (8) is connected to the pressure groove (501).

10. The battery pack according to claim 3, characterized in that, The height of the protruding section (4021) along the third direction (Z) is H1, and the height of the pressure groove (501) along the third direction (Z) is H2, satisfying: H1=H2.

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

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