Battery pack and DC appliance

Abstract

The utility model relates to domestic appliance battery platform commonality technical field discloses a kind of battery pack and DC electric appliance, battery pack includes shell, and the electric core subassembly, PCB board subassembly and socket in shell, electric core subassembly and PCB board subassembly are electrically connected, socket is electrically connected with PCB board subassembly, first through -opening corresponding with socket position is set on shell, and matched electric appliance is connected with socket through first through -opening, first through -opening is located at the intersection line position of shell bottom surface and its adjacent side face and penetrates bottom surface and its adjacent side face.The battery pack can realize multidirectional installation, and can match different installation scene.

Description

Technical Field

[0001] This utility model relates to the common technology field of battery platforms for household appliances, and in particular to a battery pack and a DC electrical appliance. Background Technology

[0002] Battery packs are a core component in the market for new energy products, and while their use has historically been limited to a small scale, large-scale industrial application is currently in its formative and initial explosive growth phase, gradually expanding its influence across various industries and bringing convenient changes to people's lifestyles. In the home appliance market, battery packs are typically categorized into built-in and external battery packs based on their installation method. External battery packs, with their independent disassembly, ease of replacement, and charging, offer unique advantages in home appliance scenarios requiring long battery life or convenient maintenance. However, existing household external battery packs can only be matched with specific connection structures, resulting in a limited assembly method and inability to accommodate diverse installation scenarios. Utility Model Content

[0003] To address the aforementioned technical problem of poor compatibility of battery packs, this invention provides a battery pack that can be installed from multiple angles and is compatible with different installation scenarios.

[0004] The specific technical solution of this utility model is as follows: a battery pack includes a shell, and a cell assembly, a PCB board assembly and a socket disposed in the shell. The cell assembly and the PCB board assembly are electrically connected, and the socket is electrically connected to the PCB board assembly. A first opening is provided on the shell corresponding to the position of the socket. Matching electrical appliances are connected to the socket through the first opening. The first opening is located at the intersection of the bottom surface of the shell and its adjacent side surface and penetrates the bottom surface and its adjacent side surface.

[0005] In the aforementioned battery pack, the battery cell assembly within the casing serves as an energy storage unit. It is electrically connected to the PCB board assembly via wires or conductive structures. The PCB board assembly performs voltage regulation and overcurrent protection on the battery cell assembly, ensuring that the output energy meets safety standards. The connector receives the stable energy processed by the PCB board assembly. The first port forms a through-type opening structure at the bottom and sides, allowing the battery pack to be installed in multiple orientations. It can be installed horizontally or vertically on compatible electrical appliances, matching different installation scenarios and improving product adaptability.

[0006] Optionally, the socket is a knife switch socket, which is fixed on the battery cell assembly. The knife switch socket has a blade-type female card slot that is electrically connected to the PCB board assembly, so as to connect with the male blade of the matching electrical appliance.

[0007] In the above technical solution, during use, the first port is aligned with the male blade of the matching electrical appliance. After insertion, the male blade will make tight contact with the blade-type female connector in the switch socket, forming a complete conductive path and realizing the power supply function of the battery pack. The battery pack is connected to the rear male blade of the matching electrical appliance through the blade-type female connector. The structure is simple and space-saving, and the large contact area between the two reduces current transmission loss. The blade-type female connector provides continuous contact pressure to the male blade, ensuring stable high-current transmission. This connection design can work synergistically with the high-rate cells and high-current PCB circuitry of the battery pack, improving the DC current load capacity of the battery pack and stably adapting to the power needs of high-power household appliances. By placing the switch socket on the cell assembly, compared to the design placed on the PCB assembly, the heat generated by the socket during high-current transmission is less likely to be conducted to sensitive components on the PCB board, preventing overheating damage to components. Furthermore, the metal bracket and shell of the cell assembly have higher heat resistance and structural strength, better adapting to the high-current load requirements of the switch socket and ensuring high safety.

[0008] Optionally, the PCB board assembly is provided with a plurality of external interfaces electrically connected to the PCB board assembly, the plurality of external interfaces including at least one or more of TYP-A ports and TYP-C ports, and the housing is provided with a plurality of second ports corresponding to the positions of the plurality of external interfaces.

[0009] In the above technical solution, the external interface is a combination of two types of ports or a single port with multiple settings, so that the battery pack can not only power the matching electrical appliances, but also replenish the power of other household electronic devices, breaking through the functional limitation of traditional household external battery packs that only serve a single device.

[0010] Optionally, the plurality of second ports are located on the bottom surface of the housing.

[0011] In the above technical solution, several second ports are concentrated on the bottom surface of the housing, which can effectively avoid the operational confusion caused by a scattered layout.

[0012] Optionally, the housing is provided with several spaced heat dissipation vents on opposite sides to allow heat inside the housing to be discharged to the outside through the heat dissipation vents.

[0013] In the above technical solution, outside air enters the housing through the heat dissipation vent, passes through the space between the front and back sides of the cell assembly and the PCB board assembly, dissipates heat from the components, and improves the safety of the battery pack.

[0014] Optionally, the housing is further provided with a magnetic port that is electrically connected to the PCB board assembly, and a third opening corresponding to the position of the magnetic port is provided on the top surface of the housing.

[0015] In the above technical solution, the battery pack is equipped with a magnetic port, which can be used to connect external devices, thus expanding the battery pack's plug-free charging function.

[0016] Optionally, the housing has a recessed first slot on the side facing the matching electrical appliance. The first slot is adapted to a protruding elastic engaging member on the corresponding side of the matching electrical appliance. The elastic engaging member is inserted into the first slot to limit the displacement of the battery pack in the vertical plane.

[0017] In the above technical solution, the mechanical limiting is formed by the engagement of the first slot and the elastic locking component. When the electrical appliance vibrates or is subjected to external force, the displacement of the battery pack in the vertical plane is restricted, that is, the displacement of the battery pack in the up, down, left and right directions is restricted, thereby improving the connection stability between the battery pack and the matching electrical appliance and ensuring power supply stability. The locking structure is simple and saves design space. The first slot can adopt brand symbol elements, such as the outline of the brand logo or exclusive graphic logo, so that the functional structure can also have brand communication value.

[0018] Optionally, the housing has two recessed second slots on its two sides adjacent to the side facing the matching electrical appliance. The second slots are adapted to the elastic engaging members protruding from the corresponding side of the matching electrical appliance. The elastic engaging members are inserted into the second slots to limit the displacement of the battery pack in the front-rear direction.

[0019] In the above technical solution, the mechanical limit is formed by the second slot and the elastic locking component, which improves the connection stability between the battery pack and the matching electrical appliances. When the electrical appliances vibrate or are subjected to external forces, the displacement of the battery pack in the front and rear directions is restricted, thus ensuring the stability of power supply. The locking structure is simple and saves design space.

[0020] Optionally, the housing has a recessed third slot on two sides adjacent to the side facing the matching electrical appliance. The third slot extends downward from the side to the bottom of the housing and is adapted to the limiting pin protruding on the corresponding side of the matching electrical appliance.

[0021] In the above technical solution, the mechanical limit is formed by the snap-fit ​​of the third slot and the limit pin, which improves the connection stability between the battery pack and the matching electrical appliances. When the electrical appliances vibrate or are subjected to external forces, the displacement of the battery pack in the front and rear directions is restricted, thus ensuring the stability of power supply. The snap-fit ​​structure is simple and saves design space.

[0022] Optionally, the PCB board assembly is provided with an indicator light post, and the housing has a light-transmitting hole corresponding to the position of the indicator light post, so that the light can penetrate the housing to display the battery pack power status; or, the PCB board assembly is provided with a power button, and the housing has a button hole corresponding to the position of the power button, so that the user can press to trigger the power query function.

[0023] In the above technical solution, the indicator light column can clearly convey the remaining power information of the battery pack. Users can quickly know the power status by observing the light through the light-transmitting hole; users can also check the battery pack power by pressing the power button at the button hole.

[0024] Another specific technical solution of this utility model is: a DC electrical appliance powered by a battery pack plugged into the appliance housing, wherein the battery pack is the aforementioned battery pack.

[0025] Compared with the prior art, the present invention has at least the following advantages: (1) The battery pack is connected to the rear male blade of the matching electrical appliance through a blade-type female card plug. The structure is simple and saves space. The contact area between the two is large, which reduces current transmission loss. The blade-type female card plug forms a continuous contact pressure on the male blade, ensuring stable transmission of high current. This connection design can work together with the high-rate cells and high-current PCB circuit of the battery pack to improve the DC current load capacity of the battery pack and can stably adapt to the power demand of high-power household appliances. (2) The magnetic port and the switch socket are set on the cell assembly, while the external interface, indicator light column and power button are set on the PCB board assembly. The structure is compact and the design space is saved by setting a slot on the surface of the housing to connect with the elastic snap-fit ​​of the matching electrical appliance, thus reducing the volume of the entire battery pack. (3) The battery pack can not only power the matching electrical appliances, but also has other ports to replenish the power of other household electronic devices, breaking through the functional limitation of traditional household external battery packs that only serve a single device; (4) By placing the switch socket on the battery cell assembly, compared with the design of placing it on the PCB board assembly, the heat generated by the socket during high current transmission is not easily conducted to the sensitive components on the PCB board, which will not cause the components to overheat and be damaged. In addition, the metal bracket and shell of the battery cell assembly have higher heat resistance and structural strength, which can better adapt to the high current load requirements of the switch socket and have high safety. Attached Figure Description

[0026] Figure 1 This is an exploded view of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the top and bottom structures of this utility model; Figure 5 This is a schematic diagram of the utility model horizontally installed on the matching electrical appliance; Figure 6 This is a schematic diagram of the utility model vertically installed on the matching electrical appliance; Figure 7 This is a schematic diagram of how this utility model connects to other electrical appliances.

[0027] The attached diagram is labeled as follows: 1. Top cover; 2. Button hole; 3. Light-transmitting hole; 4. First slot; 5. Second slot; 6. Third slot; 7. Second opening; 8. Heat dissipation opening; 9. PCB board assembly; 10. External interface; 11. Indicator light bar; 12. Power button; 13. Magnetic port; 14. Battery cell bracket; 15. Knife switch socket; 16. Battery cell body; 17. Battery cell assembly; 18. Bottom cover; 19. First opening; 20. Matching electrical appliance; 21. Male end blade; 22. Elastic locking component; 23. Limiting pin; 24. Other electrical appliances; 25. Folding bracket; 26. Third opening. Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments. Unless otherwise specified, all devices, connection structures, and methods involved in this invention are known in the art.

[0029] Example 1 Reference Figures 1 to 7 As shown, this utility model provides a battery pack, including a housing, a cell assembly 17, a PCB board assembly 9, and a socket. The housing includes an upper cover 1 and a lower cover 18. The upper cover 1 covers the lower cover 18 to form an installation space for installing the cell assembly 17 and the PCB board assembly 9. The PCB board assembly 9 is connected to the upper cover 1 by a fastener, and the cell assembly 17 is connected to the lower cover 18 by a fastener. The upper cover 1 and the lower cover 18 are snapped together. The cell assembly 17 and the PCB board assembly 9 are electrically connected. The socket is electrically connected to the PCB board assembly 9. A first opening 19 corresponding to the position of the socket is provided on the housing. A matching electrical appliance 20 is connected to the socket through the first opening 19. The first opening 19 is located at the intersection of the bottom surface of the housing and its adjacent side surface and extends through the bottom surface and its adjacent side surface.

[0030] In the aforementioned battery pack, the cell assembly 17 inside the casing serves as an energy storage unit. It is electrically connected to the PCB board assembly via wires or conductive structures. The PCB board assembly performs voltage regulation and overcurrent protection on the energy of the cell assembly 17 to ensure that the output energy meets safety standards. The socket receives the stable energy processed by the PCB board assembly. The first port 19 forms a through-type opening structure at the bottom and sides, enabling the battery pack to be installed and adapted in multiple directions. It can be installed horizontally or vertically on the matching electrical appliance 20 to match different installation scenarios and improve the product's adaptability.

[0031] In this embodiment, the socket is a knife switch socket 15, which is fixed to the cell assembly 17. The knife switch socket 15 has a blade-type female connector electrically connected to the PCB board assembly 9, for connection to the male blade 21 of the supporting electrical appliance 20. In use, the first port 19 is aligned with the male blade 21 of the supporting electrical appliance 20. After insertion, the male blade 21 will make tight contact with the blade-type female connector in the knife switch socket 15, forming a complete conductive path and realizing the power supply function of the battery pack. The battery pack is connected to the rear male blade 21 of the supporting electrical appliance 20 via the blade-type female connector. This design is simple, saves space, and has a large contact area, reducing current transmission loss. Furthermore, the blade-type female connector provides continuous contact pressure to the male blade 21, ensuring stable high-current transmission. This connection design works synergistically with the high-rate cells and high-current PCB circuitry of the battery pack, improving the DC current load capacity of the battery pack and stably adapting to the power needs of high-power household appliances. By placing the knife switch socket 15 on the battery cell assembly 17, compared to the design where it is placed on the PCB board assembly 9, the heat generated by the socket during high current transmission is less likely to be conducted to the sensitive components on the PCB board, thus preventing overheating damage to the components. Furthermore, the metal bracket and housing of the battery cell assembly 17 have higher heat resistance and structural strength, which can better meet the high current load requirements of the knife switch socket 15, resulting in high safety.

[0032] For ease of use, such as Figure 1 As shown, the PCB board assembly 9 has an indicator light post 11 extending towards the upper cover 1. The upper cover 1 has a light-transmitting hole 3 corresponding to the position of the indicator light post 11, so that the light can penetrate the housing to display the battery pack's power status. The indicator light post 11 can clearly convey the remaining power information of the battery pack, and the user can quickly know the power status by observing the light through the light-transmitting hole 3.

[0033] For ease of use, such as Figure 1 As shown, the PCB board assembly 9 has a power button 12 extending towards the upper cover 1. The upper cover 1 has a button hole 2 corresponding to the position of the power button 12, so that the user can press it to trigger the power query function. The user can check the battery pack power by pressing the power button 12 at the button hole 2.

[0034] In this embodiment, the indicator light bar 11 and the power button 12 are both located on the upper part of the PCB board assembly 9 for easy observation and operation by the user. It is understood that in other embodiments, either the indicator light bar 11 or the power button 12 may be selected.

[0035] After the battery pack is connected to the matching electrical appliance 20, it has an exposed surface on the matching electrical appliance 20, with the light-transmitting hole 3 and the button hole 2 located on the exposed surface.

[0036] To improve the compatibility of the battery pack and enable its application in more electrical appliances, such as Figure 4 As shown, the PCB board assembly 9 is provided with a plurality of external interfaces 10 electrically connected to the PCB board assembly 9. The plurality of external interfaces 10 include at least one or more of TYP-A and TYP-C ports. The housing has a plurality of second ports 7 corresponding to the positions of the plurality of external interfaces 10. In this embodiment, two external interfaces 10 are provided, one of which is a TYP-A port and the other is a TYP-C port. It is understood that in other embodiments, two TYP-A ports or two TYP-C ports, or other combinations of the two types of ports, can be provided. The combination of two types of ports or multiple single-port configurations of the external interfaces 10 allows the battery pack to not only power the matching electrical appliance 20 but also replenish the power of other household electronic devices, breaking through the functional limitation of traditional household external battery packs that only serve a single device.

[0037] For ease of explanation, this embodiment uses the state of the battery pack when connected to the matching electrical appliance as the basis for dividing the upper and lower positions.

[0038] Several second ports 7 can be located at any convenient position for plugging in electrical appliances. Preferably, several second ports 7 are located on the same side of the housing. Figure 1 and Figure 4 As shown, several second ports 7 are located on the end face of the bottom surface of the housing. Concentrating several second ports 7 on the end face of the bottom surface of the housing can effectively avoid operational confusion caused by a scattered layout.

[0039] like Figure 4 and Figure 7 As shown, the battery cell assembly 17 is fixed with a magnetic port 13 that is electrically connected to the PCB board assembly 9. A third port 26 corresponding to the position of the magnetic port 13 is provided on the housing, and the third port 26 is located on the end face of the top surface of the housing. Of course, the magnetic port can also be fixed on the PCB board or other positions on the housing. Since the battery pack has a magnetic port 13, it can carry other electrical appliances 24, which expands the battery pack's plug-and-play charging function. The third port 26 is located on the end face of the top surface of the housing. In the case of magnetic charging, the flat end face allows the charging device to be precisely aligned with the interface.

[0040] like Figure 1As shown, in this embodiment, the external interface 10 is located at the bottom of the PCB board assembly 9, the magnetic port 13 is located at the top of the battery cell assembly 17, and the switch socket 15 is located at the bottom of the battery cell assembly 17. Each interface is independently positioned and will not affect the others. It is understood that the positions of the external interface 10 and the magnetic port 13 can be interchanged, and correspondingly, the positions of the second port 7 and the third port 26 can be interchanged. It should be noted that the switch socket 15 and the magnetic port 13 only have a discharging function, while the external interface 10 has both charging and discharging functions. When the switch socket 15 is working, i.e., when the battery pack is supplying power to the associated electrical appliance 20, the external interface 10 and the magnetic port 13 cannot be used. Only after the battery pack is detached from the associated electrical appliance 20 can other electrical appliances be connected to the external interface 10 or the magnetic port 13. The external interface 10 can charge and discharge simultaneously. The aforementioned other electrical appliances are small devices with a power requirement of no more than 5 volts DC, such as handheld fans and lights.

[0041] To improve battery pack safety, several spaced-apart heat dissipation vents 8 are provided on the top and bottom ends of the casing to allow heat inside the casing to be discharged to the outside. The heat dissipation vents 8 are spaced apart from external interfaces or magnetic ports 13. Heat dissipation gaps are formed between the PCB board assembly 9 and the top cover 1, as well as between the PCB board assembly 9 and the cell assembly 17. Outside air enters the casing through the heat dissipation vents 8, passes through the heat dissipation gaps, and dissipates heat from the components, thus improving the safety of the battery pack.

[0042] In this embodiment, the battery pack is equipped with electrical appliances 20, such as... Figure 5 and Figure 6 As shown. The battery pack can be installed horizontally or vertically on the battery placement position of the accessory electrical appliance 20.

[0043] To improve the connection stability of different installation methods, a limiting structure can be set at the battery placement position on the battery pack housing and the accessory electrical appliance 20, as follows: In the first embodiment, a recessed first groove 4 is provided on the side of the housing facing the matching electrical appliance 20. The first groove 4 is adapted to the elastic engaging member 22 protruding on the corresponding side of the matching electrical appliance 20. The elastic engaging member 22 is inserted into the first groove 4 to limit the displacement of the battery pack in the vertical plane. The first groove 4 is ground into a recessed shape based on the outline of the brand logo. Regardless of whether the battery pack is inserted horizontally or vertically into the battery placement position, the elastic engaging member 22 on this side first contacts the surface of the battery pack housing and is resisted and contracted due to the squeezing action of the housing. As the battery pack is continuously inserted into the position, when the first groove 4 moves to the position of the elastic engaging member 22, the squeezing external force disappears, and the elastic engaging member 22 pops out under its own elastic restoring force, accurately embedding into the recessed first groove 4 to form a mechanical locking limit. The mechanical limiting effect is achieved by the engagement of the first slot 4 and the elastic locking component 22. When the electrical appliance vibrates or is subjected to external force, the displacement of the battery pack in the vertical plane is restricted, that is, the displacement of the battery pack in the up, down, left, and right directions is restricted, thereby improving the connection stability between the battery pack and the matching electrical appliance 20 and ensuring power supply stability. This locking structure is simple and saves design space. The first slot 4 can adopt brand symbol elements, such as the outline of the brand logo or exclusive graphic logo, so that the functional structure can also have brand communication value. As shown in Figures 5 and 6, the vertical plane mentioned above has two reference directions corresponding to the X and Y directions, respectively.

[0044] In the second embodiment, the housing has two recessed second slots 5 on its two adjacent sides facing the electrical appliance 20. The second slots 5 are adapted to the protruding elastic engaging members 22 on the corresponding surfaces of the electrical appliance 20. The elastic engaging members 22 are inserted into the second slots 5 to limit the displacement of the battery pack in the front-to-back direction. When the battery pack is horizontally inserted into the battery placement position, the elastic engaging members 22 on both sides of the battery placement position first contact the surface of the battery pack housing and are compressed by the pressure of the housing. As the battery pack continues to be inserted into place, when the second slot 5 moves to the position of the elastic engaging member 22, the external pressure disappears, and the elastic engaging member 22 pops out under its own elastic restoring force, precisely embedding into the recessed second slot 5, forming a mechanical locking limit. The mechanical locking formed by the locking of the second slot 5 and the elastic engaging member 22 improves the connection stability between the battery pack and the electrical appliance 20. When the electrical appliance vibrates or is subjected to external force, the displacement of the battery pack in the front-to-back direction is limited, ensuring power supply stability. This locking structure is simple and saves design space.

[0045] In the third embodiment, the housing and the two sides adjacent to the side facing the matching electrical appliance 20 are provided with recessed third slots 6. The third slots 6 extend downward from the side to the bottom of the housing. The third slots 6 are adapted to the limiting pins protruding on the corresponding side of the matching electrical appliance 20. The limiting pins 23 are inserted into the third slots 6 to limit the displacement of the battery pack in the front-back direction. When the battery pack is vertically inserted into the battery placement position, the limiting pins enter the third slots 6 to guide the insertion of the battery pack. After the battery pack is fully inserted, the limiting pins and the third slots 6 engage to form a mechanical limit, improving the connection stability between the battery pack and the matching electrical appliance. When the electrical appliance vibrates or is subjected to external force, the displacement of the battery pack in the front-back direction is limited, ensuring power supply stability. This engaging structure is simple and saves design space.

[0046] The battery placement structure varies depending on the installation orientation of the electrical appliance 20. Preferably, the battery pack integrates a first slot 4, a second slot 5, and a third slot 6 to make the battery pack adaptable to electrical appliances 20 with different installation orientations, thus improving its versatility. In this case, the second slot 5 is positioned above the third slot 6.

[0047] like Figure 7 As shown, when other electrical appliances 24 are magnetically mounted through the third port 26, the battery pack can be supported and fixed by connecting the folding bracket 25 through the third slot 6.

[0048] Example 2 This utility model provides a DC electrical appliance powered by a battery pack inserted into the appliance housing, wherein the battery pack is the same as that in Embodiment 1. The DC electrical appliance has a battery placement position, and a male blade is provided at the intersection of the side and bottom of the battery placement position. The battery pack is connected to the male blade of the DC electrical appliance through a blade-type female connector to achieve circuit connection and power supply.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, The device includes a housing, a battery cell assembly (17), a PCB board assembly (9), and a socket, all housed within the housing. The battery cell assembly (17) and the PCB board assembly (9) are electrically connected, and the socket is electrically connected to the PCB board assembly (9). A first opening (19) corresponding to the socket is provided on the housing. The matching electrical appliance (20) is connected to the socket through the first opening (19). The first opening (19) is located at the intersection of the bottom surface of the housing and its adjacent side surface and extends through the bottom surface and its adjacent side surface.

2. The battery pack according to claim 1, characterized in that, The socket is a knife switch socket (15), which is fixed on the battery cell assembly (17). The knife switch socket (15) is provided with a blade-type female card slot that is electrically connected to the PCB board assembly (9) to connect with the male blade (21) of the matching electrical appliance (20).

3. A battery pack according to claim 1, characterized in that, The PCB board assembly (9) is provided with a plurality of external interfaces (10) electrically connected to the PCB board assembly (9). The plurality of external interfaces (10) include at least one or more of TYP-A ports and TYP-C ports. The housing is provided with a plurality of second ports (7) corresponding to the positions of the plurality of external interfaces (10).

4. A battery pack according to claim 3, characterized in that, The several second ports (7) are provided on the bottom surface of the shell.

5. A battery pack according to claim 1, characterized in that, The shell has several spaced heat dissipation vents (8) on opposite sides to allow heat inside the shell to be discharged to the outside through the heat dissipation vents (8).

6. A battery pack according to claim 1, characterized in that, The housing is also provided with a magnetic port (13) that is electrically connected to the PCB board assembly (9), and a third port (26) corresponding to the position of the magnetic port (13) is provided on the housing. The third port (26) is located on the top surface of the housing.

7. A battery pack according to any one of claims 1 to 6, characterized in that, The housing has a recessed first slot (4) on the side facing the matching electrical appliance (20). The first slot (4) is adapted to the elastic locking member (22) protruding on the corresponding side of the matching electrical appliance (20). The elastic locking member (22) is inserted into the first slot (4) to limit the displacement of the battery pack in the vertical plane.

8. A battery pack according to any one of claims 1 to 6, characterized in that, The housing has two recessed second slots (5) on its two sides adjacent to the side facing the matching electrical appliance (20). The second slots (5) are adapted to the elastic locking member (22) protruding from the corresponding side of the matching electrical appliance (20). The elastic locking member (22) is inserted into the second slots (5) to limit the displacement of the battery pack in the front-back direction.

9. A battery pack according to any one of claims 1 to 6, characterized in that, The housing has two recessed third slots (6) on its two sides adjacent to the side facing the matching electrical appliance (20). The third slots (6) extend downward from the side to the bottom of the housing. The third slots (6) are adapted to the limiting pins protruding from the corresponding side of the matching electrical appliance (20).

10. A DC electrical appliance, powered by a battery pack plugged into the appliance housing, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 9.

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