Sealing cover, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a sealing cover, a battery pack and electric equipment. The sealing cover is used for sealing a shell of the battery pack and comprises a cover body, and one side of the heating layer is connected with the surface, facing the shell, of the cover body, and the other side of the heating layer is suitable for being connected with a battery module in the battery pack. The heating layer is directly attached to the cover body, the cover body is used for directly restraining the heating layer, and a uniform temperature plate is omitted, so that the assembly efficiency of a production line can be improved, the flexibility and the universality are high, meanwhile, the uniform temperature plate is reduced, the cost and the weight are reduced, the uniform temperature plate is omitted, the space utilization rate in the battery pack can be improved, and the production cost is reduced. Therefore, the energy density of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a sealing cover, a battery pack, and an electrical device. Background Art

[0002] Battery packs are the primary power source for electric vehicles. With the continuous development of electric vehicles, the requirements for battery packs in electric vehicles are also increasing. To extend the battery life in low-temperature environments, a heat spreader is typically placed between the battery cells and the upper sealing cover. A heating film is also installed on the heat spreader to provide uniform heating.

[0003] However, in the existing technology that uses a heat spreader for heating, the heat spreader occupies space in the battery pack and is heavy. During the battery assembly process, an additional step of installing the heat spreader is required, which reduces the flexibility and versatility of the production line layout and makes assembly difficult. Utility Model Content

[0004] Based on this, the present application provides a sealing cover, a battery pack and an electrical device to reduce the weight of the battery pack and improve assembly efficiency.

[0005] In one aspect, the present application provides a sealing cover for sealing a battery pack housing, comprising:

[0006] Cover body;

[0007] The heating layer has one side connected to the side of the cover body facing the shell, and the other side of the heating layer is suitable for connecting to the battery module in the battery pack.

[0008] In a possible implementation, the heating layer is provided with an avoidance hole, and the avoidance hole is suitable for being opposite to the battery module of the battery pack.

[0009] In a possible implementation, the heating layer includes a plurality of heating films, which are arranged in sequence and connected to each other.

[0010] In a possible implementation manner, adjacent heating films are connected via connecting sheets.

[0011] In a possible implementation, the heating layer includes two heating films, which are respectively provided on the cover and connected to each other. Avoidance grooves are respectively provided on adjacent sides of the two heating films, and the two opposite avoidance grooves are connected to each other.

[0012] In a possible implementation, the sealing cover further includes a soldering pad connected to the heating layer, and the soldering pad is provided with a lead terminal.

[0013] In a possible implementation, a lead-out port is provided on one side of the cover body, and the lead-out terminal is passed through the lead-out port.

[0014] In a possible implementation, one side of the heating layer is connected to the cover by hot pressing; and / or

[0015] The other side of the heating layer is glued to the battery module through a thermal conductive adhesive layer.

[0016] In a possible implementation, the cover is a steel structure.

[0017] In a possible implementation, the cover body is provided with sealing holes, which are arranged around the outer circumference of the cover body.

[0018] In a possible implementation, the cover body is provided with a fixing hole, the heating layer is provided with a connecting hole, and the connecting hole is opposite to the fixing hole.

[0019] On the other hand, the present application provides a battery pack, comprising a shell, a battery module and the above-mentioned sealing cover, wherein the battery module is disposed in the shell, and the sealing cover is disposed on the battery module in the shell.

[0020] In a possible implementation, the battery pack further includes a thermally conductive adhesive layer, and the battery module and the heating layer are connected via the thermally conductive adhesive layer.

[0021] In a possible implementation, the heating layer is provided with an avoidance hole, and the avoidance hole is opposite to the battery module.

[0022] On the other hand, the present application provides an electrical device including the above-mentioned battery pack.

[0023] The sealing cover, battery pack and electrical equipment provided in the present application directly attach the heating layer to the cover body, use the cover body to directly restrain the heating layer, eliminate the heat spreader, thereby improving the assembly efficiency of the production line, and having strong flexibility and versatility. At the same time, the heat spreader is reduced, and the cost and weight are also reduced. The elimination of the heat spreader can also improve the space utilization in the battery pack, thereby improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A schematic structural diagram of the sealing cover of the battery pack shown;

[0027] Figure 3 for Figure 2 A structural schematic diagram of the sealing cover from another perspective;

[0028] Figure 4 for Figure 3 A schematic diagram of the partially exploded structure of the sealing cover from another perspective.

[0029] Description of reference numerals:

[0030] 100-sealing cover;

[0031] 10-cover; 11-inlet; 12-sealing hole; 13-fixing hole;

[0032] 20-heating layer; 21-heating film; 22-connecting piece; 23-avoidance hole; 24-avoidance groove; 25-connecting hole;

[0033] 30- soldering pad; 31- lead terminal;

[0034] 200-battery pack;

[0035] 201-housing; 202-battery module; 203-fastener. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0039] The terms "first", "second" and "third" (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0040] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0041] Battery packs are the primary power source for electric vehicles. With the continuous development of electric vehicles, the requirements for battery packs in electric vehicles are also increasing. To extend the battery life in low-temperature environments, a heat spreader is typically placed between the battery cells and the upper sealing cover. A heating film is also installed on the heat spreader to provide uniform heating through the heat spreader, preventing dry burning and ensuring uniform temperature.

[0042] However, in the existing technology that uses a heat spreader for heating, the heat spreader occupies space in the battery pack and is heavy. During the battery assembly process, an additional step of installing the heat spreader is required, which reduces the flexibility and versatility of the production line layout and makes assembly difficult.

[0043] Moreover, when the upper sealing cover adopts a steel structure or other non-aluminum materials, the restraint force is different due to the different materials of the aluminum heat spreader and the sealing cover. The aluminum heat spreader, which is more easily deformed, is prone to deformation and tearing when subjected to force, resulting in poor sealing of the battery pack and inability to completely isolate the cavities. When thermal runaway occurs, the risk of cavity leakage is greater, and the degree of thermal runaway of the entire pack is difficult to control.

[0044] At the same time, capacitance will be generated between metals with potential difference. Since the aluminum temperature plate, sealing cover and heating film are made of different materials, the capacitance is too large to meet the electrical performance requirements of the battery pack.

[0045] After repeated deliberation and verification, the inventors discovered that placing the heating film directly on the sealing cover could improve assembly efficiency on the production line by eliminating the heat spreader, increasing flexibility and versatility. This would also eliminate poor sealing caused by varying degrees of deformation due to different materials, thereby improving safety. Furthermore, placing the heating film directly on the sealing cover effectively reduces capacitance by eliminating the aluminum heat spreader.

[0046] In view of this, the present application provides a sealing cover for sealing a battery pack housing, comprising:

[0047] Cover body;

[0048] The heating layer has one side connected to the side of the cover body facing the shell, and the other side of the heating layer is suitable for connecting to the battery module in the battery pack.

[0049] By directly attaching the heating layer to the cover, the cover is used to directly restrain the heating layer, eliminating the temperature plate, thereby improving the assembly efficiency of the production line and increasing flexibility and versatility.

[0050] At the same time, the number of heat spreaders is reduced, and the cost and weight are also reduced. The elimination of the heat spreader can also improve the space utilization within the battery pack, thereby increasing the energy density of the battery pack.

[0051] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0052] Figure 1 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application. Figure 2 for Figure 1 Schematic diagram of the structure of the sealing cover of the battery pack shown. Figure 3 for Figure 2 A schematic structural diagram of the sealing cover from another perspective is shown. Figure 4 for Figure 3 A schematic diagram of the partially exploded structure of the sealing cover from another perspective.

[0053] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a sealing cover 100 for use in a battery pack 200. The battery pack 200 includes a housing 201, a battery module 202, and the sealing cover 100. The battery module 202 is disposed in the housing 201, and the sealing cover 100 is connected to the housing 201 and covers the battery module 202.

[0054] The sealing cover 100 includes a cover 10 and a heating layer 20. The cover 10 is connected to the housing 201 of the battery pack 200 and is used to seal the battery module 202 disposed therein. One side of the heating layer 20 is connected to the side of the cover 10 facing the housing 201, and the other side of the heating layer 20 is connected to the battery module 202 in the battery pack 200.

[0055] In a possible implementation, the heating layer 20 is attached to a surface of the cover 10 facing the housing 201 . The heating layer 20 is used to heat the battery module 202 in the housing 201 .

[0056] By directly attaching the heating layer 20 to the cover 10 and using the cover 10 to directly restrain the heating layer 20, the aluminum temperature plate is eliminated, thereby preventing poor sealing caused by differences in stress and deformation due to different materials, thereby isolating the cavities in the battery pack 200. When thermal runaway occurs, gas is less likely to leak into the cavity, reducing the risk of thermal runaway.

[0057] At the same time, the number of heat spreaders is reduced, and the cost and weight are also reduced.

[0058] By reducing the number of steps required to install the temperature vapor chamber, the processing technology can be simplified, the production line layout can be more flexible, and the versatility can be improved.

[0059] Furthermore, the capacitance measured in the solution using a heat spreader for the heating layer is higher, at approximately 373nF. However, omitting the heat spreader reduces the capacitance to approximately 155nF. Therefore, using the heating film directly attached to the sealing cover effectively reduces the capacitance by eliminating the aluminum heat spreader.

[0060] Moreover, when using a temperature equalizing plate attached to the sealing cover, since the fixing point of the temperature equalizing plate and the upper cover needs to be designed with an avoidance structure, the glue grooves around the sealing cover and the shell often require complex designs and bending the glue grooves. This increases the cost of parts processing and also makes the gluing process more difficult.

[0061] Commonly used temperature spreaders may also adopt a sunken design due to interference between the heating film lead terminals and the beams in the shell. At the same time, the design of plastic parts, support parts, etc. in the battery pack must be changed, resulting in increased costs.

[0062] The solution of directly attaching the heating layer 20 to the cover body 10 is conducive to the continuation of the original production site process. There is no need to consider the problem of high and low tolerances that need to be controlled when the temperature plate is fixed on the shell, and the processing production line has a higher degree of continuation.

[0063] By directly attaching the heating layer 20 to the cover 10 , there is no need to consider a temperature equalizing plate, so that the glue groove is simplified to a straight groove, and the glue application process is simplified.

[0064] like Figure 3 As shown, in a possible implementation, the heating layer 20 is provided with an avoidance hole 23 . The avoidance hole 23 is opposite to the battery module 202 in the housing 201 .

[0065] Specifically, by providing the avoidance holes 23 , the heating layer 20 forms a ring shape surrounding the battery module 202 , thereby heating the four sides of the battery module 202 and improving the use efficiency of the battery module 202 .

[0066] At the same time, since the heating layer 20 is generally heated by an internal copper core, and the cover body 10 is generally also made of a metal plate, capacitance will be generated between the two. The larger the facing area, the greater the capacitance. By setting the avoidance hole 23, the use of the heating layer 20 is reduced, so that the corresponding area between the heating layer 20 and the cover body 10 is reduced, thereby reducing the capacitance between the heating layer 20 and the cover body 10.

[0067] like Figure 3 and Figure 4 As shown, in a possible implementation, the heating layer 20 includes a plurality of heating films 21 , and the plurality of heating films 21 are arranged in sequence and connected to each other.

[0068] Since the sizes of battery packs 200 in different devices are different, multiple heating films 21 are provided, matched and combined, and connected in sequence, so that they can be adapted to battery packs 200 of various sizes, thereby improving the scope of application.

[0069] In a possible implementation, adjacent heating films 21 are connected via a connecting piece 22 .

[0070] Since the heating film 21 is relatively thin and each heating film 21 needs to be powered for heating, if they are set up separately, it will be detrimental to the assembly of the sealing cover 100 and reducing the size of the sealing cover 100. Therefore, it is necessary to connect multiple heating films 21 together and use connecting pieces 22 to connect the heating films 21.

[0071] On one hand, the connecting piece 22 can electrically connect adjacent heating films 21 together. On the other hand, the connecting piece 22 is relatively thin and does not occupy too much space, which is suitable for improving the integration of the sealing cover 100 .

[0072] In one possible implementation, the heating layer 20 includes two heating films 21, which are respectively provided on the cover body 10 and connected to each other. An avoidance groove 24 is respectively provided on the adjacent side of the two heating films 21, and the two opposite avoidance grooves 24 are connected to each other.

[0073] By providing two heating films 21 , the number of elements of the heating layer 20 is reduced, thereby improving the efficiency during assembly.

[0074] At the same time, avoidance grooves 24 are respectively provided on adjacent sides of the two heating films 21, and the two opposite avoidance grooves 24 are interconnected to form avoidance holes 23. This facilitates the formation of avoidance holes 23 on the heating layer 20 and improves processing efficiency.

[0075] In a possible implementation, the sealing cover 100 further includes a soldering pad 30, which is connected to the heating layer 20 and has a lead-out terminal 31. The lead-out terminal 31 is used to connect to an external distribution box.

[0076] Specifically, such as Figure 3 As shown, the soldering pad 30 is arranged on one side edge of the heating layer 20 and is connected to the cover 10. The soldering pad 30 is arranged on the edge, which can avoid the battery module 202 or other components arranged in the shell 201 in the battery pack 200, thereby improving the integration of the battery pack 200.

[0077] In a possible implementation, a lead-out port 11 is provided on one side of the cover 10 , and the lead-out terminal 31 is passed through the lead-out port 11 .

[0078] Specifically, the cover plate 10 is provided with a lead-out port 11 in a portion where the heating layer 20 is not provided, and the soldering pad 30 is provided on the side of the heating layer 20 close to the lead-out port 11, so as to facilitate the lead-out terminal 31 to pass through the lead-out port 11, thereby reducing the wiring length of the lead-out terminal 31, avoiding interference during assembly, or entanglement caused by excessive wiring.

[0079] In a possible implementation, one side of the heating layer 20 is connected to the cover 10 by a hot pressing process.

[0080] Specifically, a plurality of heating films 21 are spliced ​​together and hot-pressed onto the cover 10 , and the spliced ​​portions are connected by connecting pieces 22 .

[0081] The heating layer 20 is hot-pressed onto the cover 10. On the one hand, this simplifies the processing technology and improves the processing efficiency. On the other hand, there is no adhesive layer or other materials between the heating layer 20 and the cover 10, thereby further improving the effect of the cover 10 restraining the heating layer 20 and preventing the adhesive layer from falling off when subjected to force, causing the heating layer 20 to peel off, making the seal inside the package invalid, and causing gas to leak into the cavity during thermal runaway.

[0082] In a possible implementation, the other side of the heating layer 20 is adhered to the battery module 202 via a thermally conductive adhesive layer.

[0083] In a possible implementation, the cover body 10 is a steel structure.

[0084] Steel has high structural strength and is not easily deformed under stress, which can improve the stability of the structure and prevent problems such as sealing failure.

[0085] In a possible implementation, the cover body 10 is provided with a sealing hole 12 , and the sealing hole 12 is arranged around the outer circumference of the cover body 10 .

[0086] The setting of the sealing hole 12 makes it easier to cover the cover 10 on the shell 201. At the same time, the sealing holes 12 set around the cover 10 can also improve the stability of the connection between the sealing cover 100 and the shell 201, and achieve the function of sealing the battery module 202 in the shell 201.

[0087] In a possible implementation, the cover 10 is provided with a fixing hole 13 , and the heating layer 20 is provided with a connecting hole 25 , which is opposite to the fixing hole 13 .

[0088] The provision of the fixing holes 13 and the connecting holes 25 facilitates improving the stability of the connection between the cover body 10 and the heating layer 20 , and can further improve the stability of the connection between the sealing cover 100 and the housing 201 .

[0089] The sealing cover 100 provided in the embodiment of the present application is used to seal the shell of the battery pack 200, and includes a cover body 10 and a heating layer 20. The cover body 10 is arranged on the shell 201 of the battery pack 200; one side of the heating layer 20 is connected to the side of the cover body 10 facing the shell 201, and the other side of the heating layer 20 is suitable for connection with the battery module 202 in the battery pack 200.

[0090] By directly attaching the heating layer 20 to the cover 10 and using the cover 10 to directly restrain the heating layer 20, the temperature equalizing plate is eliminated, thereby improving the assembly efficiency of the production line, and having strong flexibility and versatility. At the same time, the temperature equalizing plate is reduced, and the cost and weight are also reduced. The elimination of the temperature equalizing plate can also improve the space utilization in the battery pack, thereby improving the energy density of the battery pack.

[0091] In addition, if Figure 1 As shown, an embodiment of the present application further provides a battery pack 200, comprising a shell 201, a battery module 202 and the above-mentioned sealing cover 100, wherein the battery module 202 is disposed in the shell 201, and the sealing cover 100 is connected to the shell 201 and covers the battery module 202.

[0092] The specific structure, working principle and function of the sealing cover 100 have been described in detail in the above embodiments and will not be repeated here.

[0093] In a possible implementation, the battery module 202 and the heating layer 20 are connected via a thermally conductive adhesive layer.

[0094] A thermally conductive adhesive layer is provided between the heating layer 20 and the battery module 202 , which is bonded to the battery module 202 and can improve the efficiency of heat transfer of the heating layer 20 . At the same time, it can also play a certain role in heat uniformity.

[0095] In a possible implementation, the battery pack 200 further includes a fastener 203 . The fastener 203 passes through the sealing hole 12 and is provided on the housing 201 , thereby connecting the sealing cover 100 to the housing 201 .

[0096] Since the sealing hole 12 is arranged around the outer periphery of the cover body 10 , the outer periphery of the sealing cover 100 can be fixedly connected to the housing 201 , thereby sealing the battery module 202 covered in the housing 201 in the housing 201 .

[0097] In one possible implementation, the battery pack 200 includes multiple battery modules 202, which are arranged side by side. The shell 201 is provided with partitions between the battery modules 202, and the fasteners 203 are also provided on the partitions of the shell 201 through the fixing holes 13 and the connecting holes 25, thereby sealing and separating the multiple battery modules 202 in the shell 201.

[0098] In one possible implementation, a cooling channel is further provided on the battery pack 200. The cooling channel is provided on the housing 201 and is used to cool the battery module 202, thereby improving the working efficiency of the battery module 202.

[0099] In addition, an embodiment of the present application further provides an electrical device, including an electrical device and a battery pack 200 described in any of the above embodiments, wherein the battery pack 200 is used to provide electrical energy to the electrical device.

[0100] The specific structure, working principle and function of the battery pack 200 have been described in detail in the aforementioned embodiments and will not be repeated here.

[0101] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0102] In addition, the electrical equipment may also be other equipment, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., wherein the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealing cover for sealing a housing of a battery pack (200), characterized in that: include: Cover (10); A heating layer (20), one side of the heating layer (20) is connected to a side of the cover (10) facing the shell (201), and the other side of the heating layer (20) is suitable for connecting to a battery module in the battery pack (200).

2. The sealing cover according to claim 1, wherein: The heating layer (20) is provided with an avoidance hole (23), and the avoidance hole (23) is suitable for being opposite to the battery module (202) of the battery pack (200).

3. The sealing cover according to claim 1, wherein: The heating layer (20) comprises a plurality of heating films (21), and the plurality of heating films (21) are arranged in sequence and connected to each other.

4. The sealing cover according to claim 3, wherein: Adjacent heating films (21) are connected via connecting sheets (22).

5. The sealing cover according to claim 1, wherein: The heating layer (20) comprises two heating films (21), the two heating films (21) are respectively arranged on the cover body (10) and are connected to each other, and an avoidance groove (24) is respectively provided on one side adjacent to the two heating films (21), and the two opposite avoidance grooves (24) are connected to each other.

6. The sealing cover according to claim 1, wherein: The sealing cover (100) further comprises a soldering pad (30), wherein the soldering pad (30) is connected to the heating layer (20), and the soldering pad (30) is provided with a lead terminal (31).

7. The sealing cover according to claim 6, wherein: A lead-out port (11) is provided on one side of the cover body (10), and the lead-out terminal (31) is passed through the lead-out port (11).

8. The sealing cover according to claim 1, wherein: One side of the heating layer (20) is connected to the cover (10) by heat pressing; and / or The other side of the heating layer (20) is glued to the battery module via a heat-conducting adhesive layer.

9. The sealing cover according to claim 1, wherein: The cover body (10) is a steel structure.

10. The sealing cover according to claim 1, wherein: The cover body (10) is provided with a sealing hole (12), and the sealing hole (12) is arranged around the outer periphery of the cover body (10).

11. The sealing cover according to claim 1, wherein: The cover body (10) is provided with a fixing hole (13), and the heating layer (20) is provided with a connecting hole (25), and the connecting hole (25) is opposite to the fixing hole (13).

12. A battery pack, characterized in that: The invention comprises a shell (201), a battery module (202) and a sealing cover (100) as claimed in any one of claims 1 to 11, wherein the battery module (202) is arranged in the shell (201), and the sealing cover (100) is covered on the battery module (202) in the shell (201).

13. The battery pack according to claim 12, wherein: The battery pack further comprises a heat-conducting adhesive layer, and the battery module (202) and the heating layer (20) are connected via the heat-conducting adhesive layer.

14. The battery pack according to claim 12, wherein: The heating layer (20) is provided with an avoidance hole (23), and the avoidance hole (23) is opposite to the battery module (202).

15. An electrical device, characterized in that: Comprising a battery pack (200) as claimed in any one of claims 12 to 14.

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