Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, and the battery pack comprises a box body, a battery cell, a sealing assembly and a first acquisition line, a mounting cavity is formed in the box body, a wiring hole is formed in the side wall of the mounting cavity in a penetrating manner, the battery cell is mounted in the mounting cavity, the sealing assembly is mounted at the wiring hole, and the wiring hole is sealed by the sealing assembly. The first collection line is partially embedded in the sealing assembly, the first collection line is provided with a first collection end and a first output end which are opposite to each other, the first collection end is located in the mounting cavity and connected with the battery cell, and the first output end is located outside the mounting cavity. According to the battery pack provided by the utility model, the technical problem that errors are easy to occur when the temperature of the battery core of the existing immersed battery pack is measured can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and electrical equipment. Background Art

[0002] In related technologies, in order to enable the immersed battery pack to collect the temperature of the battery cells while meeting the sealing requirements (i.e., to ensure that the coolant does not leak), the collection line (or temperature collection line) needs to be divided into two sections, one of which is set inside the battery pack and connected to the preset temperature collection point on the battery cell, and the other is set outside the battery pack and connected to the temperature collection equipment. The two collection lines are connected by an electrical connector, which is installed on the side wall of the box and sealed to prevent the coolant in the battery pack from leaking at the electrical connector.

[0003] However, dividing the acquisition line into two sections and connecting the two sections through an electrical connector is equivalent to adding an additional resistor to the acquisition line, which can easily cause fluctuations in the temperature acquisition electrical signal and errors in temperature measurement. Utility Model Content

[0004] The embodiments of the present utility model provide a battery pack and an electrical device, which can improve the technical problem of the existing immersion battery pack that errors are easily generated when measuring the temperature of its battery cells.

[0005] In a first aspect, an embodiment of the present invention provides a battery pack, comprising a housing, a battery cell, a sealing assembly, and a first acquisition line. The housing is provided with an installation cavity, the sidewalls of which are provided with a wiring opening. The battery cell is installed in the installation cavity, and the sealing assembly is installed at the wiring opening, and the sealing assembly seals the wiring opening. The first acquisition line is partially embedded in the sealing assembly, and has a first acquisition end and a first output end opposite to each other. The first acquisition end is located in the installation cavity and connected to the battery cell, and the first output end is located outside the installation cavity.

[0006] In one embodiment, the sealing assembly includes a bolt, a nut and a sealing gasket, the bolt includes a screw and a screw head, the screw is passed through the wiring opening, the nut is threaded onto the end of the screw away from the screw head, the sealing gasket is clamped and installed between the nut and the side wall of the installation cavity and / or between the screw head and the side wall of the installation cavity, and the first acquisition line is at least partially embedded in the bolt.

[0007] In one embodiment, a wire hole is provided in the bolt, the wire hole passes through the bolt along the axial direction of the bolt, the first acquisition wire is at least partially passed through the wire hole, and the wire hole is filled with sealant.

[0008] In one embodiment, a groove is provided on the end surface of the screwing head facing away from the nut, and the wire hole passes through the bottom of the groove.

[0009] In one embodiment, the groove is a circular groove, and the inner diameter of the groove is set to be the same as the outer diameter of the screw.

[0010] In one embodiment, the sealing assembly includes a rubber block, the rubber block is interference-fitted in the wiring opening, and the first acquisition line is at least partially integrally formed with the rubber block.

[0011] In one embodiment, the battery pack further includes a second collection line, which is at least partially embedded in the sealing assembly and has a second collection end and a second output end relative to each other. The second collection end is located in the installation cavity and is used to collect the temperature of the coolant. The second output end is located outside the installation cavity.

[0012] In one embodiment, a protective layer is provided on the periphery of the first acquisition line and the second acquisition line.

[0013] In one embodiment, a device cavity is further provided in the box body, and the device cavity is located on one side of the installation cavity, and the wiring opening connects the installation cavity and the device cavity.

[0014] In a second aspect, an embodiment of the present invention provides an electrical device, which includes the battery pack described in any one of the above embodiments.

[0015] Beneficial effects of the embodiments of the present utility model:

[0016] In an embodiment of the present invention, the acquisition line is partially embedded in a sealing component, which seals the wiring opening on the installation cavity. After the sealing component seals the wiring opening, the first acquisition end of the acquisition line is located in the installation cavity and connected to the battery cell, and the first output end is located outside the installation cavity so as to be connected to the temperature acquisition device. This eliminates the need to divide the acquisition line into two sections on the basis of a sealed installation cavity. Compared to the solution of "dividing the acquisition line into two sections and connecting the two sections with an electrical connector", the acquisition line in this application does not have additional resistors connected, thereby avoiding fluctuations in the temperature acquisition electrical signal, ensuring accurate measurement of the battery cell temperature, and improving the technical problem of errors that are prone to occur when measuring the battery cell temperature of existing immersion battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a cross-sectional view of the structure of an embodiment of the battery pack of the present application;

[0019] Figure 2 This is a partial structural diagram of an embodiment of the battery pack of the present application;

[0020] Figure 3 This is a structural diagram of an embodiment of a first acquisition line and a sealing assembly in the battery pack of the present application;

[0021] Figure 4 for Figure 3 Structural exploded diagram of the sealing component;

[0022] Figure 5 This is a structural cross-sectional view of another embodiment of the battery pack of the present application;

[0023] Figure 6 is a structural cross-sectional view of another embodiment of the battery pack of the present application;

[0024] Figure 7 This is a structural cross-sectional view of another embodiment of the battery pack of the present application.

[0025] Description of Figure Numbers:

[0026] Label name Label name Label name 100 battery pack 31 bolt 34 rubber blocks 10 Cabinet 311 screw 40 First acquisition line 11 Mounting cavity 312 Screw head 41 First acquisition terminal 111 Wiring opening 313 Wire hole 42 First output terminal 12 Equipment cavity 314 groove 50 Second acquisition line 20 battery cells 32 Nut 51 Second acquisition terminal 30 Sealing components 33 Sealing gasket 52 Second output terminal DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0028] First, in the relevant technology, in order to achieve the immersion battery pack to meet the sealing requirements while collecting the battery cell temperature (that is, to ensure that the coolant does not leak), the collection line needs to be divided into two sections, one of which is set inside the battery pack and connected to the preset temperature collection point on the battery cell, and the other is set outside the battery pack and connected to the temperature collection equipment. The two sections of the collection line are connected through an electrical connector, which is installed on the side wall of the box and sealed to prevent the coolant in the battery pack from leaking at the electrical connector.

[0029] However, dividing the acquisition line into two sections and connecting the two sections through an electrical connector is equivalent to adding an additional resistor to the acquisition line, which can easily cause fluctuations in the temperature acquisition electrical signal and errors in temperature measurement.

[0030] To solve the above technical problems, Figure 1 As shown, an embodiment of the present invention provides a battery pack 100 , which mainly includes a box body 10 , a battery cell 20 , a sealing assembly 30 and a first acquisition line 40 .

[0031] Among them, such as Figure 1 As shown, the housing 10 is provided with a mounting cavity 11, and a wiring opening 111 is formed through the side wall of the mounting cavity 11. The battery cell 20 is mounted in the mounting cavity 11. Specifically, the housing 10 serves as the outer shell structure of the battery pack 100, and is used to mount and protect components such as battery modules and high-voltage electrical devices. The shape and size of the housing 10 can be flexibly designed as needed. For example, the housing 10 can be a rectangular parallelepiped structure to facilitate production, installation, and placement.

[0032] The box body 10 is provided with an installation cavity 11, in which a battery module is installed. Figure 2 As shown, the battery module is composed of a plurality of battery cells 20. In this embodiment, the battery pack 100 is an immersed battery pack 100, so the installation cavity 11 is also used to contain coolant. The battery cells 20 are immersed in the coolant, and the coolant absorbs the heat from the battery cells 20 to prevent the temperature of the battery cells 20 from being too high.

[0033] like Figure 1 As shown, a wiring opening 111 is further provided on the side wall of the installation cavity 11. The wiring opening 111 is used for allowing the acquisition line to pass through the installation cavity 11 and out of the installation cavity 11. When the temperature acquisition device is set outside the box 10, the wiring opening 111 can be connected to the outside of the box 10. When the temperature acquisition device is set in other cavities in the box 10 (such as Figure 7 When the wiring opening 111 is in the equipment cavity 12 in the box 10, the wiring opening 111 can be connected to other boxes 10 in the box 10.

[0034] In this embodiment, because the installation cavity 11 is also used to hold coolant, in order to prevent the coolant from leaking from the wiring opening 111, the battery pack 100 of the present application also includes a sealing assembly 30. The sealing assembly 30 is installed at the wiring opening 111, and the sealing assembly 30 seals the wiring opening 111, thereby preventing the coolant from leaking from the wiring opening 111.

[0035] There are many options for the specific structure of the sealing assembly 30, such as Figure 5 As shown, the sealing component 30 can be a rubber block 34, and the sealing rubber block 34 is interference-fitted or bonded into the wiring opening 111, so that the wiring opening 111 can be sealed to prevent the coolant from leaking from the wiring opening 111.

[0036] For another example, the sealing assembly 30 may include a threaded connector (such as a bolt 31 or a screw) and a sealing rubber ring. The inner wall of the wiring opening 111 may be provided with an internal thread. The threaded connector is screwed into the wiring opening 111, and the threaded connector presses the sealing rubber ring tightly against the side wall of the mounting cavity 11. The sealing rubber ring is arranged around the wiring opening 111, which can also achieve sealing of the wiring opening 111.

[0037] like Figure 1 As shown, in order to collect the temperature of the battery cell 20, the battery pack 100 of the present application also includes a first collection line 40. The first collection line 40 is at least partially embedded in the sealing assembly 30, and the first collection line 40 has a first collection end 41 and a first output end 42 relative to each other. The first collection end 41 is located in the installation cavity 11 and is connected to the battery cell 20. The first output end 42 is located outside the installation cavity 11.

[0038] Specifically, a middle section of the first collection line 40 is embedded in the sealing assembly 30. For example, when the sealing assembly 30 includes a rubber block 34, the middle section of the first collection line 40 can be tightly wrapped by the sealing rubber block 34, and the two ends of the first collection line 40 (i.e., the first collection end 41 and the first output end 42) are located outside the sealing rubber block 34.

[0039] For another example, when the sealing rubber block 34 includes a threaded connector and a sealing rubber ring, the middle section of the first acquisition line 40 can be embedded in the threaded connector or the sealing rubber ring by an integral molding manner, and the two ends of the first acquisition line 40 are also located outside the threaded connector or the sealing rubber ring.

[0040] During production and assembly, Figure 3 As shown, the first collection line 40 can be embedded in the sealing component 30 to form a whole with the sealing component 30, and then installed on the box 10 together. When installing, as shown in FIG. Figure 1As shown, the first collection end 41 of the first collection line 40 is located in the installation cavity 11 and is connected to a preset temperature collection point on the battery cell 20 (the temperature collection point is usually located at the top of the battery cell 20), and the first output end 42 is located outside the installation cavity 11 to facilitate connection with the temperature collection device, so that the temperature collection device can collect and record the temperature of the battery cell 20.

[0041] It should be noted that there are generally multiple battery cells 20 in the battery pack 100. In order to collect the temperature of each battery cell 20, the number of first collection lines 40 can be designed to match the number of battery cells 20, and all first collection lines 40 can pass through the sealing assembly 30 and out of the installation cavity 11.

[0042] Of course, multiple wiring openings 111 and sealing components 30 can also be provided, and multiple first acquisition lines 40 pass through multiple sealing components 30 to exit the installation cavity 11, for example. Figure 2 or Figure 3 In the illustrated structural solution, multiple first acquisition lines 40 are provided, divided into two groups, and two sealing assemblies 30 are provided. One group of first acquisition lines 40 passes through one sealing assembly 30 and out of the installation cavity 11, while the other group of first acquisition lines 40 passes through the other sealing assembly 30 and out of the installation cavity.

[0043] In summary, it can be understood that the battery pack 100 of the present application embeds the acquisition line portion in the sealing component 30, and the sealing component 30 seals the wiring opening 111 on the installation cavity 11. After the sealing component 30 seals the wiring opening 111, the first acquisition end 41 of the acquisition line is located in the installation cavity 11 and connected to the battery cell 20, and the first output end 42 is located outside the installation cavity 11 so as to be able to connect to the temperature acquisition device. In this way, on the basis of sealing the installation cavity 11, the acquisition line does not need to be divided into two sections. Compared with the solution of "dividing the acquisition line into two sections and connecting the two sections of the acquisition line with an electrical connector", the acquisition line in the present application does not have additional resistors connected, thereby avoiding fluctuations in the temperature acquisition electrical signal, ensuring accurate measurement of the temperature of the battery cell 20, and improving the technical problem that the existing immersion battery pack 100 is prone to errors when measuring the temperature of its battery cell 20.

[0044] Optionally, in one embodiment, as Figure 1 and Figure 4 As shown, the sealing assembly 30 includes a bolt 31, a nut 32 and a sealing gasket 33. The bolt 31 includes a screw rod 311 and a screw head 312. The screw rod 311 is inserted into the wiring opening 111. The nut 32 is screwed to the end of the screw rod 311 away from the screw head 312. The sealing gasket 33 is clamped between the side wall of the installation cavity 11 and the nut 32 or the screw head 312. The first acquisition line 40 is at least partially embedded in the bolt 31.

[0045] Specifically, in Figure 1 In the structural solution shown, the screw head 312 of the bolt 31 is located outside the mounting cavity 11, the screw rod 311 extends from the screw head 312 into the mounting cavity 11, and the nut 32 is located in the mounting cavity 11 and is screwed onto the screw rod 311. The position of the sealing gasket 33 can be arranged in a variety of ways. For example, the sealing gasket 33 can be located between the screw head 312 and the side wall of the mounting cavity 11, and the screw head 312 presses the sealing gasket 33 against the side wall of the mounting cavity 11; or Figure 1 As shown, the sealing gasket 33 is located between the nut 32 and the side wall of the mounting cavity 11, and the nut 32 presses the sealing gasket 33 against the side wall of the mounting cavity 11; alternatively, a sealing gasket 33 is provided between the screwing head 312 and the side wall of the mounting cavity 11, and between the nut 32 and the side wall of the mounting cavity 11.

[0046] Regardless of which of the above methods is used, the sealing gasket 33 is disposed around the wiring opening 111 , so that the wiring opening 111 can be sealed.

[0047] In order to allow the first acquisition line 40 to pass through the installation cavity 11 and out of the installation cavity 11, in this embodiment, the first acquisition line 40 is partially embedded in the bolt 31, and there are many ways to embed the first acquisition line 40 in the bolt 31.

[0048] For example, optionally, in one embodiment, the first acquisition line 40 can be partially integrally formed with the bolt 31, that is, in this embodiment, the bolt 31 can be die-cast, and during die-casting, a portion of the first acquisition line 40 is located in the die-casting mold. After molding, the first acquisition line 40 is partially embedded in the bolt 31.

[0049] For example, optional, such as Figure 4 As shown, in one embodiment, a wire hole 313 is provided in the bolt 31. The wire hole 313 passes through the bolt 31 in the axial direction of the bolt 31. The first acquisition line 40 is partially passed through the wire hole 313. The wire hole 313 is filled with sealant, which is formed by curing the glue. In this way, the first acquisition line 40 is partially embedded in the bolt 31. It can be understood that in this embodiment, by providing the wire hole 313 on the bolt 31, the first acquisition line 40 passes through the wire hole 313, and then the sealant is filled, the process of embedding the first acquisition line 40 in the bolt 31 is very simple and easy to produce.

[0050] Optionally, in one embodiment, as Figure 4As shown, a groove 314 is provided on the end face of the screwing head 312 facing away from the nut 32, and the wire hole 313 passes through the bottom of the groove 314. It can be understood that by providing the groove 314 and making the wire hole 313 pass through to the bottom of the groove 314, not only can the length of the wire hole 313 be reduced, which is convenient for processing the wire hole 313, but also the first collection line 40 can be easily passed through, thereby avoiding the problem of the wire hole 313 being too long and causing inconvenience in threading.

[0051] Optionally, in one embodiment, the groove 314 is a circular groove, and the inner diameter of the groove 314 is set to be the same as the outer diameter of the screw 311. This can ensure that the wire holes 313 are all located at the bottom of the groove that passes through the groove 314, reducing the length of the wire holes 313, and can also avoid the situation where the groove 314 is too large and affects the structural strength of the bolt 31 pair.

[0052] Optionally, in addition to the bolt 31, nut 32 and sealing washer 33, the sealing assembly 30 may also include: Figure 5 As shown, the sealing assembly 30 includes a rubber block 34, which is interference-fitted within the wiring opening 111. The first acquisition cable 40 is at least partially integrally formed with the rubber block 34. Specifically, in this embodiment, the rubber block 34 can be injection-molded from a rubber material. During the injection molding process, a portion of the first acquisition cable 40 is placed within a mold. After the rubber material is formed into the rubber block 34, a portion of the first acquisition cable 40 is wrapped within the rubber block 34, i.e., the first acquisition cable 40 is partially embedded within the rubber block 34.

[0053] After the first acquisition line 40 is embedded in the rubber block 34 , the rubber block 34 is sealed and installed in the wiring opening 111 , which not only seals the wiring opening 111 but also allows the first acquisition line 40 to extend from inside the installation cavity 11 to outside the installation cavity 11 .

[0054] Optionally, in one embodiment, the battery pack 100 further includes a second collection line 50, which is partially embedded in the sealing assembly 30, and the second collection line 50 has a second collection end 51 and a second output end 52 relative to each other, the second collection end 51 is located in the installation cavity 11, and the second collection end 51 is used to collect the temperature of the coolant, and the second output end 52 is located outside the installation cavity 11.

[0055] Specifically, in some cases, in addition to collecting the temperature of the battery cell 20, it is also necessary to collect the temperature of the coolant. Therefore, this embodiment also provides a second data collection line 50. The second data collection line 50 and the first data collection line 40 have the same structure in the line body, and the second output end 52, like the first output end 42, is used to connect to a temperature collection device. The difference is that the first data collection end 41 of the first data collection line 40 is connected to the battery cell 20 and collects the temperature of the battery cell 20, while the second data collection end 51 of the second data collection line 50 is located in the coolant and spaced apart from the battery cell 20 to collect the coolant temperature.

[0056] It should be noted here that in order to prevent the second collecting end 51 from floating with the coolant, a support structure can be set in the installation cavity 11. The support structure is located in the coolant, and the second collecting end 51 can be supported and positioned on the support positioning structure, so that the second collecting end 51 can be prevented from floating with the coolant.

[0057] It should also be noted that the first acquisition line 40 and the second acquisition line 50 can be thermocouple wires, which are high-performance, high-precision temperature measurement sensor cables that can better and more accurately collect the temperatures of the battery cells 20 and the coolant.

[0058] Optionally, in one embodiment, a protective layer (not shown) is provided around the outer periphery of the first and second acquisition lines 40, 50. Specifically, the protective layer may be a Teflon layer, which allows the first and second acquisition lines 40, 50 to withstand high temperatures and prevent the acquisition signal from being affected by high ambient temperatures. Alternatively, the protective layer may be a corrosion-resistant layer, which prevents the surfaces of the first and second acquisition lines 40, 50 from corroding after long-term use.

[0059] Optionally, in one embodiment, as Figure 7 As shown, a device cavity 12 is also provided in the housing 10, and the device cavity 12 is located on one side of the installation cavity 11, and a wiring opening 111 connects the installation cavity 11 and the device cavity 12. Specifically, in this embodiment, there are two cavities separated in the housing 10, one of which is the installation cavity 11, and the other is the device cavity 12. The battery management system, the thermal management system (including the temperature acquisition device), etc. can be installed in the device cavity 12. Therefore, in order to enable the first acquisition line 40 and the second acquisition line 50 to be connected to the temperature acquisition device, the wiring opening 111 connects the installation cavity 11 and the device cavity 12, and the sealing assembly 30 is installed in the wiring opening 111 and seals the wiring opening 111. The first acquisition line 40 and the second acquisition line 50 are both partially embedded in the sealing assembly 30, and one end is located in the installation cavity 11, and the other end is located in the device cavity 12.

[0060] It should be noted that if Figure 2 or Figure 3As shown, multiple first collection lines 40 are provided. Each of the first collection lines 40 extends from its respective temperature collection point toward the sealing assembly 30, and then extends out of the mounting cavity 11 after passing through the sealing assembly 30. Because the temperature collection points are located at different locations, the lengths of the multiple first collection lines 40 may also vary. During installation, the lengths of the first collection lines 40 need to be determined based on the spacing between the wiring openings 111 and the temperature collection points.

[0061] An embodiment of the present application also provides an electrical device, which includes a battery pack 100. The specific structure of the battery pack 100 refers to the above embodiment. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0062] Among them, electrical equipment can be but is not limited to cars, charging piles, junction boxes, household appliances, etc.

[0063] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: A box body, wherein a mounting cavity is provided in the box body, and a wiring opening is passed through the side wall of the mounting cavity; A battery cell, the battery cell being installed in the installation cavity; A sealing assembly is installed at the wiring opening and seals the wiring opening; as well as, A first acquisition line, wherein the first acquisition line is partially embedded in the sealing assembly and has a first acquisition end and a first output end opposite to each other, the first acquisition end is located in the installation cavity and connected to the battery cell, and the first output end is located outside the installation cavity.

2. The battery pack according to claim 1, wherein: The sealing assembly includes a bolt, a nut and a sealing washer, the bolt includes a screw rod and a screw head, the screw rod is inserted into the wiring opening, and the nut is screwed to an end of the screw rod away from the screw head; The sealing gasket is clamped and installed between the nut and the side wall of the installation cavity and / or between the screwing head and the side wall of the installation cavity, and the first collection line is at least partially embedded in the bolt.

3. The battery pack according to claim 2, wherein: A wire hole is provided in the bolt, and the wire hole passes through the bolt along the axial direction of the bolt. The first acquisition wire is at least partially passed through the wire hole, and the wire hole is filled with sealant.

4. The battery pack according to claim 3, wherein: A groove is provided on the end surface of the screwing head facing away from the nut, and the wire hole passes through the bottom of the groove.

5. The battery pack according to claim 4, characterized in that: The groove is a circular groove, and the inner diameter of the groove is set to be the same as the outer diameter of the screw.

6. The battery pack according to claim 1, wherein: The sealing assembly includes a rubber block, which is interference-fitted in the wiring opening, and the first acquisition line is at least partially integrally formed with the rubber block.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery pack also includes a second collection line, which is at least partially embedded in the sealing assembly and has a second collection end and a second output end relative to each other. The second collection end is located in the installation cavity and is used to collect the temperature of the coolant. The second output end is located outside the installation cavity.

8. The battery pack according to claim 7, characterized in that: The outer peripheries of the first acquisition line and the second acquisition line are both provided with a protective layer.

9. The battery pack according to any one of claims 1 to 6, characterized in that: An equipment cavity is further provided in the box body, and the equipment cavity is located on one side of the installation cavity. The wiring opening communicates with the installation cavity and the equipment cavity.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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