Battery pack and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack and an electric device. The battery pack comprises a first box body, and a first heat exchange cavity is formed in the first box body. The battery pack further comprises a second box body, the second box body is arranged in the first heat exchange cavity, and a second heat exchange cavity communicated with the first heat exchange cavity is formed in the second box body. The battery pack further comprises a third box body, and the third box body is arranged in the second heat exchange cavity. The battery pack further comprises a battery pack which is arranged in the third box body; the first heat exchange cavity and the second heat exchange cavity are both used for allowing heat exchange fluid to pass through, and the heat exchange fluid in the first heat exchange cavity exchanges heat with the battery pack through the heat exchange fluid in the second heat exchange cavity. In this way, the temperature uniformity of different single batteries in the battery pack can be improved, and the heat exchange efficiency of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack and an electrical device. Background Technology

[0002] Encouraged by national sustainable development policies and new energy vehicle policies, electric vehicles have experienced rapid development, and energy-saving and environmentally friendly electric vehicles are increasingly favored by consumers. Electric vehicle batteries generate heat during prolonged use, especially in high outdoor temperatures, which can even lead to fires and other safety incidents. An effective thermal management system can improve the working environment and performance of the power battery, thereby ensuring the driving safety and reliability of electric vehicles. However, current thermal management systems tend to cause large temperature differences within the battery, severely affecting its electrochemical performance and lifespan. Utility Model Content

[0003] This application provides a battery pack and an electrical device that can improve the temperature uniformity of different individual cells in the battery pack and improve the heat exchange efficiency of the battery pack.

[0004] This application provides a battery pack. The battery pack includes a first housing with a first heat exchange chamber inside. The battery pack also includes a second housing disposed within the first heat exchange chamber, and the second housing has a second heat exchange chamber communicating with the first heat exchange chamber. The battery pack further includes a third housing disposed within the second heat exchange chamber. The battery pack also includes a battery pack disposed within the third housing; both the first and second heat exchange chambers are used for the passage of heat exchange fluid, and the heat exchange fluid in the first heat exchange chamber exchanges heat with the battery pack through the heat exchange fluid in the second heat exchange chamber.

[0005] In one embodiment of this application, the battery pack further includes a filter device disposed in the second housing, and the first heat exchange chamber is connected to the second heat exchange chamber through the filter device.

[0006] In one embodiment of this application, the battery pack further includes: at least two sets of diversion devices, both disposed in the second housing; wherein, at least one set of diversion devices is used to guide the heat exchange fluid in the first heat exchange chamber into the second heat exchange chamber, and at least one set of diversion devices is used to guide the heat exchange fluid in the second heat exchange chamber into the first heat exchange chamber.

[0007] In one embodiment of this application, at least two sets of diversion devices include a first diversion device and a second diversion device. The first diversion device and the second diversion device are distributed on opposite sides of the second housing. The first diversion device is used to guide the heat exchange fluid in the first heat exchange chamber into the second heat exchange chamber, and the second diversion device is used to guide the heat exchange fluid in the second heat exchange chamber into the first heat exchange chamber.

[0008] In one embodiment of this application, the flow guiding device includes: a flow passage disposed in the second housing, and the flow passage having a flow channel inside, the flow channel being connected to the first heat exchange chamber and the second heat exchange chamber respectively; and a flow guiding element disposed in the flow channel, the flow guiding element being used to guide the heat exchange fluid through the flow channel.

[0009] In one embodiment of this application, the battery pack further includes a heat dissipation system connected to the first housing, the heat dissipation system being used to dissipate heat from the heat exchange fluid in the first heat exchange chamber.

[0010] In one embodiment of this application, the battery pack further includes a heating system connected to the first housing, the heating system being used to heat the heat exchange fluid in the first heat exchange chamber.

[0011] In one embodiment of this application, the battery pack further includes a fire extinguishing device disposed in the first heat exchange chamber and / or the second heat exchange chamber, the fire extinguishing device being configured to release fire extinguishing fluid in the event of thermal runaway of the battery pack.

[0012] In one embodiment of this application, the battery pack further includes: a charging / discharging plug, disposed in the first housing, and electrically connected to the battery pack via a first electronic wire, the first electronic wire passing through the second housing and the third housing; and a communication plug, disposed in the first housing, and electrically connected to the battery pack via a second electronic wire, the second electronic wire passing through the second housing and the third housing.

[0013] Accordingly, this application also provides an electrical device, including a battery pack as described in the above embodiments, wherein the battery pack is a power supply for the electrical device.

[0014] The beneficial effects of this application are as follows: Unlike the prior art, this application provides a battery pack and an electrical device. The battery pack includes a first housing, a second housing, and a third housing. The second housing is disposed in a first heat exchange chamber inside the first housing, the third housing is disposed in a second heat exchange chamber inside the second housing, and the battery pack is disposed in the third housing. In other words, the third housing and the battery pack inside are completely immersed in the heat exchange fluid of the second heat exchange chamber, which helps to maintain a uniform temperature of different individual cells in the battery pack, thereby improving the temperature uniformity of different individual cells in the battery pack and effectively improving the electrochemical performance and service life of the battery pack. Furthermore, the heat exchange fluid in the first heat exchange chamber exchanges heat with the battery pack through the heat exchange fluid in the second heat exchange chamber, which helps to improve the heat exchange efficiency of the battery pack and thus helps to ensure that the battery pack is in a suitable operating environment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the battery pack of the first embodiment of this application;

[0017] Figure 2 This is a flowchart illustrating an embodiment of the cooling and heat dissipation operation of the battery pack in this application;

[0018] Figure 3 This is a schematic flowchart of an embodiment of the heating operation of the battery pack in this application;

[0019] Figure 4 This is a flowchart illustrating an embodiment of the fire extinguishing operation of the battery pack in this application;

[0020] Figure 5 This is a schematic diagram of the structure of the battery pack of the second embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the structure of an embodiment of the drainage device of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 11 First housing; 111 First heat exchange chamber; 12 Second housing; 121 Second heat exchange chamber; 13 Third housing; 20 Battery pack; 30 Filter device; 40 Drainage device; 40a First drainage device; 40b Second drainage device; 41 Flow-through component; 42 Flow-through channel; 43 Drainage component; 51 Heat dissipation system; 52 Heating system; 60 Fire extinguishing device; 71 Charging / discharging connector; 711 Positive electrode connector; 712 Negative electrode connector; 713 First electronic wire; 72 Communication connector; 721 Second electronic wire. Detailed Implementation

[0024] 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, and 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. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0025] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] This application provides a battery pack and an electrical device, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0027] To address the technical problem of large temperature differences in batteries caused by thermal management systems in existing technologies, one embodiment of this application provides a battery pack. The battery pack includes a first housing with a first heat exchange chamber inside. The battery pack also includes a second housing disposed within the first heat exchange chamber, and the second housing has a second heat exchange chamber communicating with the first heat exchange chamber. The battery pack further includes a third housing disposed within the second heat exchange chamber. The battery pack also includes a battery pack disposed within the third housing; both the first and second heat exchange chambers are used for the passage of heat exchange fluids, and the heat exchange fluid in the first heat exchange chamber exchanges heat with the battery pack through the heat exchange fluid in the second heat exchange chamber. This will be described in detail below.

[0028] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery pack of this application.

[0029] In one embodiment, the battery pack includes a battery array 20, which includes multiple individual batteries. Individual batteries include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit the specific types. The battery pack provides power to an electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0030] In one embodiment, the battery pack includes a first housing 11, which has a first heat exchange chamber 111 inside. The battery pack also includes a second housing 12, which is disposed within the first heat exchange chamber 111 and has a second heat exchange chamber 121 communicating with the first heat exchange chamber 111. The battery pack also includes a third housing 13, which is disposed within the second heat exchange chamber 121. The battery pack's battery assembly 20 is disposed within the third housing 13. Both the first heat exchange chamber 111 and the second heat exchange chamber 121 are used for the passage of heat exchange fluid, and the heat exchange fluid in the first heat exchange chamber 111 exchanges heat with the battery assembly 20 through the heat exchange fluid in the second heat exchange chamber 121.

[0031] In this embodiment, the third housing 13 and its internal battery pack 20 are completely immersed in the heat exchange fluid of the second heat exchange chamber 121. This helps maintain a uniform temperature among the different individual cells in the battery pack 20, thereby improving the temperature uniformity of the individual cells and effectively enhancing the electrochemical performance and lifespan of the battery pack 20. Furthermore, the heat exchange fluid in the first heat exchange chamber 111 exchanges heat with the battery pack 20 through the heat exchange fluid in the second heat exchange chamber 121, which helps improve the heat exchange efficiency of the battery pack 20. This, in turn, helps ensure that the battery pack 20 is in a suitable operating environment, and the heat generated by the battery pack 20 can be promptly carried away by the heat exchange fluid, making it suitable for high-rate and high-current operating conditions.

[0032] It should be noted that the heat exchange process between the battery pack 20 and the heat exchange fluid in this embodiment includes both cooling and heating of the battery pack 20 by the heat exchange fluid. Cooling the battery pack 20 by the heat exchange fluid should be understood as the heat from the battery pack 20 being conducted to the heat exchange fluid in the second heat exchange chamber 121, and then exchanging heat with the heat exchange fluid in the first heat exchange chamber 111 before being transferred to the outside by the heat exchange fluid in the first heat exchange chamber 111. Heating the battery pack 20 by the heat exchange fluid should be understood as the external heat being conducted to the heat exchange fluid in the second heat exchange chamber 121 through the heat exchange fluid in the first heat exchange chamber 111, and then exchanging heat with the battery pack 20 by the heat exchange fluid in the second heat exchange chamber 121, thus heating the battery pack 20.

[0033] Heat exchange fluids can be non-conductive liquids with low freezing points. Examples include fluorinated liquids, silicone oils, and mineral oils. Fluorinated liquids offer advantages such as chemical stability, low surface tension, low viscosity, and good insulation properties. Their boiling points are generally between 50°C and 150°C, allowing for rapid heat dissipation. Fluorinated liquids are widely used in immersion liquid cooling systems for data center servers, allowing direct contact with electronic components for heat dissipation, effectively reducing server operating temperatures and improving performance and stability. Silicone oils possess good electrical insulation, thermal stability, low volatility, and oxidation resistance, with a wide viscosity range to adapt to different equipment and environmental requirements. Silicone oils are often used for localized cooling in servers, such as applying them to the surfaces of heat-generating components like CPUs to aid heat dissipation and ensure electrical insulation. Mineral oils are widely available and inexpensive, offering some insulation and heat dissipation capabilities, and can protect equipment to some extent from dust and moisture.

[0034] In one embodiment, the battery pack further includes a filter device 30, which is disposed in the second housing 12. The first heat exchange chamber 111 is connected to the second heat exchange chamber 121 through the filter device 30. The filter device 30 may include filter elements such as a filter screen. The filter device 30 can connect the first heat exchange chamber 111 and the second heat exchange chamber 121, and can filter impurities to prevent impurities from entering the battery pack 20 and affecting the stability of the battery pack 20.

[0035] In one embodiment, the battery pack further includes a heat dissipation system 51, which is connected to the first housing 11 and is used to dissipate heat from the heat exchange fluid in the first heat exchange chamber 111. During the cooling and heat dissipation operation of the battery pack 20, the heat of the battery pack 20 is conducted to the heat exchange fluid in the second heat exchange chamber 121. After heat exchange between the heat exchange fluid in the first heat exchange chamber 111 and the heat exchange fluid in the second heat exchange chamber 121, the heat is conducted to the heat dissipation system 51 through the heat exchange fluid in the first heat exchange chamber 111, so that the heat is dissipated to the outside of the battery pack through the heat dissipation system 51.

[0036] Specifically, please refer to the following: Figure 2 The cooling and heat dissipation of the battery pack 20 may include the following steps.

[0037] S101: The battery pack generates heat during operation.

[0038] S102: The heat generated by the battery pack is conducted to the heat exchange fluid in the first heat exchange chamber through the heat exchange fluid in the second heat exchange chamber.

[0039] S103: The heat exchange fluid in the first heat exchange chamber exchanges heat with the heat dissipation system.

[0040] S104: The heat exchange fluid that has completed heat exchange with the heat dissipation system flows back to the first heat exchange chamber.

[0041] S105: The heat exchange fluid in the first heat exchange chamber flows back to the second heat exchange chamber to absorb the heat generated by the battery pack.

[0042] In one embodiment, the battery pack further includes a heating system 52 connected to the first housing 11. The heating system 52 is used to heat the heat exchange fluid in the first heat exchange chamber 111. During the heating operation of the battery pack 20, the heating system 52 heats the heat exchange fluid in the first heat exchange chamber 111 to conduct heat to the heat exchange fluid in the second heat exchange chamber 121, and then the heat exchange fluid in the second heat exchange chamber 121 exchanges heat with the battery pack 20, thus heating the battery pack 20.

[0043] Specifically, please refer to the following: Figure 3 The heating process of battery pack 20 may include the following steps.

[0044] S201: The heating system heats the heat exchange fluid in the first heat exchange chamber.

[0045] S202: The heat exchange fluid in the first heat exchange chamber exchanges heat with the heat exchange fluid in the second heat exchange chamber to heat the heat exchange fluid in the second heat exchange chamber.

[0046] S203: The heat exchange fluid in the second heat exchange chamber exchanges heat with the battery pack to heat the battery pack.

[0047] In one embodiment, the battery pack further includes a fire extinguishing device 60 disposed in a first heat exchange chamber 111 and / or a second heat exchange chamber 121, and the fire extinguishing device 60 is configured to release fire extinguishing fluid in the event of thermal runaway of the battery pack 20. Figure 1This example demonstrates the configuration of a fire extinguishing device 60 installed in the first heat exchange chamber 111. In this embodiment, in the event of thermal runaway of the battery pack 20, for example, upon detecting an alarm signal indicating thermal runaway, the fire extinguishing device 60 releases fire extinguishing fluid, which mixes with the heat exchange fluid for rapid fire suppression. By installing the fire extinguishing device 60, this embodiment enables timely fire suppression in the event of thermal runaway of the battery pack 20, preventing the spread of thermal runaway.

[0048] Specifically, please refer to the following: Figure 4 The fire extinguishing operation of battery pack 20 may include the following steps.

[0049] S301: An alarm signal indicating thermal runaway of the battery pack has been detected in the battery pack.

[0050] S302: The fire extinguishing device releases fire extinguishing fluid into the first heat exchange chamber, where the fire extinguishing fluid mixes with the heat exchange fluid in the first heat exchange chamber.

[0051] S303: The fire extinguishing fluid enters the second heat exchange chamber along with the heat exchange fluid for rapid fire extinguishing.

[0052] In one embodiment, the battery pack further includes a charging / discharging plug 71, which is disposed in the first housing 11 and is used to connect to an external device to realize charging and discharging operations of the battery pack. The charging / discharging plug 71 is electrically connected to the battery pack 20 through a first electronic wire 713, which passes through the second housing 12 and the third housing 13.

[0053] Specifically, the charging and discharging plug-in 71 may include a positive plug-in 711 and a negative plug-in 712, both of which are electrically connected to the battery pack 20 via corresponding first electronic wires 713.

[0054] In one embodiment, the battery pack further includes a communication plug-in 72, which is disposed in the first housing 11. The communication plug-in 72 is used to establish a communication connection with an external device to realize communication signal interaction between the battery pack and the external device. The communication plug-in 72 is electrically connected to the battery pack 20 through a second electronic wire 721, which passes through the second housing 12 and the third housing 13.

[0055] Please refer to the following: Figure 5 , Figure 5 This is a schematic diagram of the structure of the second embodiment of the battery pack of this application.

[0056] In an alternative embodiment, the difference between this embodiment and the above embodiment lies in that the battery pack further includes at least two sets of flow guiding devices 40, both of which are disposed in the second housing 12. At least one set of flow guiding devices 40 is used to guide the heat exchange fluid in the first heat exchange chamber 111 into the second heat exchange chamber 121, and at least one set of flow guiding devices 40 is used to guide the heat exchange fluid in the second heat exchange chamber 121 into the first heat exchange chamber 111. By providing these at least two sets of flow guiding devices 40, this embodiment enables the heat exchange fluid in the first heat exchange chamber 111 and the second heat exchange chamber 121 to circulate in an orderly manner, further improving the heat exchange efficiency of the battery pack 20.

[0057] Specifically, the at least two sets of diversion devices 40 include a first diversion device 40a and a second diversion device 40b. The first diversion device 40a is used to guide the heat exchange fluid in the first heat exchange chamber 111 into the second heat exchange chamber 121, and the second diversion device 40b is used to guide the heat exchange fluid in the second heat exchange chamber 121 into the first heat exchange chamber 111. Furthermore, the first diversion device 40a and the second diversion device 40b are distributed on opposite sides of the second housing 12. In this embodiment, by reasonably arranging the positions of the first diversion device 40a and the second diversion device 40b, the heat exchange fluid entering the second heat exchange chamber 121 from the first diversion device 40a can pass through the battery pack 20 as much as possible before being discharged from the second diversion device 40b to the first heat exchange chamber 111, thus ensuring the heat exchange efficiency of the battery pack 20.

[0058] Please refer to the following: Figure 6 , Figure 6 This is a schematic diagram of the structure of an embodiment of the drainage device of this application.

[0059] In one embodiment, the flow guiding device 40 includes a flow-through component 41 and a flow guiding component 43. The flow-through component 41 is disposed in the second housing 12, and a flow-through channel 42 is provided inside the flow-through component 41, which communicates with the first heat exchange chamber 111 and the second heat exchange chamber 121 respectively. The flow guiding component 43 is disposed in the flow-through channel 42 and is used to guide the heat exchange fluid through the flow-through channel 42.

[0060] Optionally, the flow guide 43 can be a fan, pump or other guiding element. The flow guide 43 guides the heat exchange fluid through the flow channel 42, so that the heat exchange fluid in the first heat exchange chamber 111 can enter the second heat exchange chamber 121 through the flow channel 42, or so that the heat exchange fluid in the second heat exchange chamber 121 can enter the first heat exchange chamber 111 through the flow channel 42.

[0061] In summary, this application provides a battery pack and an electrical device. The battery pack includes a first housing, a second housing, and a third housing. The second housing is disposed in a first heat exchange chamber inside the first housing, the third housing is disposed in a second heat exchange chamber inside the second housing, and the battery pack is disposed in the third housing. In other words, the third housing and the battery pack inside are completely immersed in the heat exchange fluid of the second heat exchange chamber, which helps to maintain a uniform temperature among the different individual cells in the battery pack, thereby improving the temperature uniformity of the different individual cells in the battery pack and effectively improving the electrochemical performance and lifespan of the battery pack. The thermal management effect of the battery pack of this application is significantly better than air cooling and ordinary liquid cooling methods. Furthermore, the heat exchange fluid in the first heat exchange chamber exchanges heat with the battery pack through the heat exchange fluid in the second heat exchange chamber, which helps to improve the heat exchange efficiency of the battery pack and thus helps to ensure that the battery pack is in a suitable operating environment.

[0062] The battery pack and power device provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized by, include: The first housing has a first heat exchange chamber inside; The second housing is disposed in the first heat exchange chamber, and the interior of the second housing has a second heat exchange chamber that communicates with the first heat exchange chamber; The third housing is disposed within the second heat exchange chamber; as well as The battery pack is disposed in the third housing; both the first heat exchange chamber and the second heat exchange chamber are used for the passage of heat exchange fluid, and the heat exchange fluid in the first heat exchange chamber exchanges heat with the battery pack through the heat exchange fluid in the second heat exchange chamber.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes: A filter device is installed in the second housing, and the first heat exchange chamber is connected to the second heat exchange chamber through the filter device.

3. The battery pack according to claim 1, characterized in that, The battery pack also includes: At least two sets of drainage devices are installed in the second housing; Among them, at least one set of diversion devices is used to guide the heat exchange fluid in the first heat exchange chamber into the second heat exchange chamber, and at least one set of diversion devices is used to guide the heat exchange fluid in the second heat exchange chamber into the first heat exchange chamber.

4. The battery pack according to claim 3, characterized in that, The at least two sets of diversion devices include a first diversion device and a second diversion device. The first diversion device and the second diversion device are distributed on opposite sides of the second housing. The first diversion device is used to guide the heat exchange fluid in the first heat exchange chamber into the second heat exchange chamber, and the second diversion device is used to guide the heat exchange fluid in the second heat exchange chamber into the first heat exchange chamber.

5. The battery pack according to claim 3, characterized in that, The drainage device includes: A flow-through component is disposed in the second housing, and the flow-through component has a flow-through channel inside, the flow-through channel being connected to both the first heat exchange chamber and the second heat exchange chamber; and A flow guide is disposed in the flow channel, and the flow guide is used to guide the heat exchange fluid through the flow channel.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes: A heat dissipation system is connected to the first housing and is used to dissipate heat from the heat exchange fluid in the first heat exchange chamber.

7. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes: A heating system is connected to the first housing and is used to heat the heat exchange fluid in the first heat exchange chamber.

8. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes: A fire extinguishing device is disposed in the first heat exchange chamber and / or the second heat exchange chamber, and the fire extinguishing device is configured to release fire extinguishing fluid in the event of thermal runaway of the battery pack.

9. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes: A charging / discharging plug is disposed in the first housing, and the charging / discharging plug is electrically connected to the battery pack via a first electronic wire, the first electronic wire passing through the second housing and the third housing; and A communication plug-in is disposed in the first housing, and the communication plug-in is electrically connected to the battery pack via a second electronic wire, the second electronic wire passing through the second housing and the third housing.

10. An electrical device, characterized by The device includes a battery pack as described in any one of claims 1 to 9, wherein the battery pack is a power supply for the electrical device.

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