Electric chain saw

Abstract

The utility model discloses an electric chain saw, which belongs to the field of chain saws, solves the problems of short endurance and poor use comfort of the electric chain saw in the prior art, and adopts the technical scheme that the electric chain saw comprises a shell, a guide rod and a chain wound on the guide rod, a driving motor used for driving the chain wound on the guide rod to rotate is arranged in the shell, and the driving motor is connected with the guide rod. A driving motor is arranged in the shell, a holding area is arranged above the shell, a first battery pack is arranged behind the holding area, a second battery pack is arranged below the holding area, the second battery pack is located behind the driving motor, and the first battery pack and the second battery pack are used for supplying power to the driving motor. According to the electric chain saw, the endurance of the electric chain saw is improved, and the use comfort is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chain saw field, especially a kind of electric chain saw. BACKGROUND

[0002] At present, most of the electric chain saws on the market use detachable battery packs for power supply, such as invention patents CN114192883A and CN118613342A, and the battery pack is usually placed at the rear end of the electric chain saw. This conventional layout has significant drawbacks: when equipped with a large-capacity battery pack, its bulkiness and increased weight will cause the center of gravity of the electric chain saw to move backward, severely affecting the convenience of operation, especially in logging and pruning operations, it is difficult to control flexibly. While choosing a small and delicate battery pack, although it can reduce the weight, it is limited by the limited power and cannot meet the long-term normal work requirements, resulting in a significant reduction in working time. SUMMARY

[0003] The purpose of the utility model is to provide an electric chain saw, which solves the problem of short battery life and poor comfort of use in the prior art, and improves the battery life and comfort of use of the electric chain saw.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an electric chain saw, comprising a shell, a guide rod and a chain wound around the guide rod, a drive motor is arranged in the shell for driving the chain wound around the guide rod to rotate, a holding area is arranged above the shell, a first battery pack is arranged behind the holding area, a second battery pack is arranged below the holding area, the second battery pack is located behind the drive motor, and the first battery pack and the second battery pack are used to power the drive motor.

[0005] After adopting the above-mentioned technical scheme, the utility model has the following advantages: the first battery pack and the second battery pack are arranged behind and below the holding area of the shell, making full use of the internal and peripheral space of the electric chain saw, making the entire device structure more compact, reducing the overall volume and floor area of the electric chain saw under the premise of ensuring various functions, facilitating carrying and storage. This layout can also make the center of gravity of the electric chain saw closer to the holding position, effectively improving the overall balance of the electric chain saw, avoiding the problem of center of gravity deviation caused by a single battery pack being too large or too heavy, and helping to improve the stability and flexibility during operation. When logging or pruning, whether holding horizontally or adjusting the angle of operation, the operator can more easily keep the electric chain saw stable, reducing the shaking caused by the deviation of the center of gravity, greatly improving the accuracy and smoothness of the cutting operation, allowing the electric chain saw to be operated more persistently and comfortably. Compared with the traditional single-battery design, the combination of the first battery pack and the second battery pack significantly increases the power reserve, which can effectively prolong the continuous working time of the electric chain saw.

[0006] Further, from the rear side of the shell, the center of gravity of the first battery pack coincides with the parting line of the shell.

[0007] With the foregoing technical solution, the parting line refers to the line where the two halves of the mold contact when closed and determine the shape of the part. By setting the center of gravity of the first battery pack on the parting line of the shell, it means that the weight of the battery pack is evenly distributed on both sides of the electric chain saw, which helps to maintain the overall balance of the electric chain saw. This can avoid the problem of the electric chain saw tilting forward or backward or left or right due to the excessive weight of the battery pack, making the operation more stable.

[0008] Further, from the rear side of the shell, the center of gravity of the second battery pack is located within the range of -25mm to 25mm of the shell in the direction perpendicular to the parting line.

[0009] With the foregoing technical solution, keeping the center of gravity of the second battery pack within this range helps to achieve the overall balance of the electric chain saw. When the center of gravity of the battery pack deviates too much from the center line, the overall balance of the electric chain saw will be affected, which will make the electric chain saw difficult to operate during use. Excessive deviation of the center of gravity means that the operator needs to exert more force to maintain the balance of the electric chain saw, especially during long-term use, which will cause the muscles of the hands, wrists and arms to feel fatigue faster.

[0010] Further, from the left and right sides of the shell, the first battery pack is inclinedly arranged, and the included angle between the rear side plane of the first battery pack and the bottom plane of the shell is α, 110°≤α≤135°.

[0011] With the foregoing technical solution, by adjusting the angle of the first battery pack, the overall center of gravity distribution of the electric chain saw can be further optimized, which helps to improve the operation stability and balance of the electric chain saw, making the cutting process more stable. If the angle is less than 110°, the battery pack may be too vertical, which may cause the center of gravity of the electric chain saw to be too high when holding horizontally, and may cause shaking and instability. If the angle is greater than 135°, the center of gravity may be too biased to one side, which may cause shaking and instability, and may also make the electric chain saw appear bulky, especially when working in narrow spaces.

[0012] Further, a main handle is provided above the shell, the main handle is arranged around the shell to form the holding area, the first battery pack is arranged behind the main handle, and the bottom area of the main handle and the shell are located behind the driving motor to form a containing space for containing the second battery pack.

[0013] By the technical scheme, the main handle surrounds the shell to form a holding area, which conforms to the ergonomic design, and the user can hold the electric chain saw more naturally and comfortably during operation, effectively reducing the fatigue of the hands during long-time operation. The first battery pack is arranged at the rear of the main handle, and the position of the battery pack does not interfere with the hand operation during operation, and the weight of the battery pack is distributed at the rear of the hand, which helps to maintain the balance during operation, further improving the comfort of operation. The bottom area of the main handle and the shell are located at the rear area of the driving motor to form a space for accommodating the second battery pack, which avoids the increase in volume caused by separately opening a space for placing the battery pack, and realizes the reasonable arrangement of the battery pack, so that the structure of the entire electric chain saw is more compact, the capacity of the battery is increased in the limited space, the space utilization efficiency is improved, and the gravity distribution of the electric chain saw is further optimized, so that the equipment is more stable during work, and shaking and deviation are reduced.

[0014] Further, the rear of the main handle is provided with a first battery slot recessed into the main handle, and the bottom of the main handle is provided with a second battery slot recessed into the main handle, and the first battery pack and the second battery pack are respectively detachable from the first battery slot and the second battery slot.

[0015] By the technical scheme, the battery slot is designed in the form of being recessed into the main handle, which can effectively utilize the space inside the electric chain saw, and the battery pack can be installed to be more fitted to the surface of the main handle, so that the structure of the electric chain saw is more compact, and the battery pack does not protrude too much to affect holding. The detachable design greatly simplifies the battery replacement process, and the user can quickly replace the battery pack according to needs.

[0016] Further, from the left and right sides of the shell, the plane where the bottom of the second battery pack is located is parallel to the outermost end plane of the bottom of the shell.

[0017] By the technical scheme, keeping the bottom plane of the second battery pack parallel to the outermost end plane of the bottom of the shell helps to achieve good balance of the entire electric chain saw, which can avoid the problem of gravity deviation caused by the second battery pack being too high or too low, so that the electric chain saw is more stable during use, and the electric chain saw is also easy to place.

[0018] Further, from the left and right sides of the shell, the plane where the bottom of the second battery pack is located is not lower than the outermost end plane of the bottom of the shell.

[0019] By the technical scheme, the appropriately raised position of the second battery pack helps to adjust the overall gravity center of the electric chain saw, thereby helping to improve the operation experience of the electric chain saw.

[0020] Further, from the left and right sides of the shell, the second battery pack is located in front of the first battery pack.

[0021] By the above technical solution, the second battery pack is in front, which can effectively adjust the gravity center distribution of the front and rear directions of the electric chain saw. For example, when performing horizontal cutting operation, the gravity center change can reduce the "floating" feeling caused by the light front end of the electric chain saw, so that the user can cut more stably when pushing the electric chain saw.

[0022] Further, viewed from the rear side of the shell, the first battery pack is vertically arranged, and the second battery pack is horizontally arranged.

[0023] By the above technical solution, by different placement modes (horizontal and vertical) of the battery packs, the space inside the electric chain saw can be more effectively utilized. This layout design helps to arrange more or larger capacity batteries in the compact shell, thereby increasing the battery capacity without affecting the overall size. The battery packs arranged in different directions can help to better distribute the weight, improve the balance of the electric chain saw, and also improve the control performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below with reference to the accompanying drawings:

[0025] Figure 1 Fig. 1 is a structural schematic view of the electric chain saw of the present application;

[0026] Figure 2 Fig. 2 is an exploded view of the electric chain saw of the present application;

[0027] Figure 3 Fig. 3 is a structural schematic view of the electric chain saw of the present application viewed from the rear side of the shell;

[0028] Figure 4 Fig. 4 is a structural schematic view of the electric chain saw of the present application viewed from the right side of the shell;

[0029] In the drawings, 10 is a shell, 11 is a holding area, 12 is a parting line, 13 is a first battery slot, 14 is a second battery slot, 15 is an auxiliary handle, 16 is a main handle, 17 is a containing space, 20 is a guide rod, 21 is a chain, 30 is a driving motor, 40 is a first battery pack, and 41 is a second battery pack. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0031] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the utility model, and the above drawings (if any) are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0032] It should be understood that in various embodiments of the utility model, the size of the serial number as related to each process does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the utility model.

[0033] It should be understood that in the utility model, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be understood that in the utility model, "a plurality of" means two or more. "And / or" is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, X and / or Y can mean that X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. "Including X, Y and Z", "including X, Y, Z" means that X, Y and Z are all included, "including X, Y or Z" means that one of X, Y and Z is included, and "including X, Y and / or Z" means that any one or any two or three of X, Y and Z is included.

[0035] The technical solutions of the utility model will be described in detail below with specific examples. The following specific examples can be combined or replaced according to actual conditions, and the same or similar concepts or processes may not be described in some embodiments.

[0036] As shown in Figures 1 to 4 The utility model provides a kind of electric chain saw, including shell 10, guide rod 20 and chain 21 around setting on guide rod 20, driving motor 30 for driving chain 21 around setting on guide rod 20 is equipped in shell 10, the upper portion of shell 10 is equipped with holding area 11, first battery pack 40 is equipped behind holding area 11, second battery pack 41 is equipped below holding area 11, second battery pack 41 is located behind driving motor 30, first battery pack 40 and second battery pack 41 are used to power driving motor 30.

[0037] The first battery pack 40 and the second battery pack 41 are set up in the space behind and below the grip area 11 on the housing 10, making full use of the internal and surrounding space of the electric chainsaw. This makes the entire device structure more compact, reducing the overall size and footprint of the electric chainsaw while ensuring all functions are maintained, making it easier to carry and store. This layout also brings the center of gravity of the electric chainsaw closer to the grip position, effectively improving the overall balance of the electric chainsaw and avoiding the problem of center of gravity shift caused by a single battery pack being too large or too heavy. This helps to improve the stability and flexibility during operation. When logging or pruning, whether holding it horizontally or adjusting the angle, the operator can more easily keep the electric chainsaw stable, reducing shaking caused by center of gravity shift, greatly improving the accuracy and smoothness of cutting operations, and enabling the electric chainsaw to be operated more continuously and comfortably. Compared with the traditional single-battery design, the combination of the first battery pack 40 and the second battery pack 41 significantly increases the power reserve, which can effectively extend the continuous working time of the electric chainsaw.

[0038] It should be noted that the drive motor 30 is also located below the grip area 11, and the first battery pack 40 and the second battery pack 41 can be connected in series or in parallel to power the drive motor 30.

[0039] It should be noted that the housing 10 is also provided with an auxiliary handle 15, which is located in front of the first battery pack 40 and the second battery pack 41. It provides an additional grip point, allowing the operator to use a more stable two-handed operation. The stable grip greatly reduces the shaking of the electric chainsaw, making the chain 21 run more smoothly.

[0040] The parting line 12 is the line that the two halves of the mold contact and determine the shape of the part when they are closed. Viewed from the rear of the housing 10, with the parting line 12 of the housing 10 as the reference, the center of gravity of the first battery pack 40 coincides with the parting line 12 of the housing 10. Setting the center of gravity of the first battery pack 40 on the parting line 12 of the housing 10 means that the weight of the battery pack is evenly distributed on both sides of the electric chainsaw, which helps to maintain the overall balance of the electric chainsaw. This can avoid the problem of the electric chainsaw tilting left and right due to the excessive weight of the battery pack as much as possible, making the operation more stable.

[0041] It should be noted that in this embodiment, the parting line 12 of the housing 10 coincides with the center line of the entire electric chainsaw. The coincidence of the center of gravity of the first battery pack 40 with the parting line 12 of the housing 10 means that the projection of the center of gravity of the first battery pack 40 in the direction of viewing from the rear of the housing 10 coincides with the parting line 12 of the housing 10. To visually demonstrate the relationship between the first battery pack 40 and the parting line 12 of the housing 10, the invisible part of the parting line 12 of the housing 10 is marked with a dashed line.

[0042] When the center of gravity of the battery pack deviates from the parting line 12 of the housing 10 too much, the overall balance of the electric chain saw will be affected, which will make the electric chain saw difficult to control during use. If the center of gravity deviates too much, the operator needs to exert more force to keep the electric chain saw balanced, especially during long-term use, which will cause the muscles of the hands, wrists and arms to feel tired faster. Therefore, in the present application, the center of gravity of the second battery pack 41 is located within the range of -25mm to 25mm in the direction perpendicular to the parting line 12 of the housing 10, which helps to achieve the overall balance of the electric chain saw. For ease of distinction, the distance between the center of gravity of the second battery pack 41 and the parting line 12 of the housing 10 in the direction perpendicular to the parting line 12 is denoted by L1, where a negative value indicates a position to the left of the parting line 12 of the housing 10, and a positive value indicates a position to the right of the parting line 12 of the housing 10. In the present application, L1 is -20mm, so the auxiliary handle 15 is located on the left side of the housing 10 in the present application, which can help compensate for the additional weight distribution changes caused by the second battery pack 41, thereby further maintaining the balance of the electric chain saw in the left-right direction. Of course, L1 can also be -10mm, 0, 10mm, etc. Figure 1

[0043] Further, from the rear side of the housing 10, the first battery pack 40 is vertically arranged and the second battery pack 41 is horizontally arranged, which can more effectively utilize the space inside the electric chain saw. This layout design helps to arrange more or larger capacity batteries in the compact housing 10, thereby increasing the battery capacity without affecting the overall size. The differently oriented battery packs can help better distribute the weight, improve the balance of the electric chain saw, and also improve the handling performance.

[0044] It should be noted that in the present embodiment, the first battery pack 40 and the second battery pack 41 are cuboids.

[0045] Specifically, from the rear side of the housing 10, the long axis of the first battery pack 40 is parallel to the up-down direction of the housing 10 and the short axis is parallel to the left-right direction of the housing 10, and the vertically arranged long axis of the second battery pack 41 is parallel to the left-right direction of the housing 10 and the short axis is parallel to the up-down direction of the housing 10, which can more effectively utilize the space inside the electric chain saw, helps to balance the overall center of gravity of the electric chain saw, and also makes the structure of the electric chain saw more compact.

[0046] ​The shell 10 is provided with a main handle 16 above it, and the main handle 16 is arranged around the shell 10 to form a holding area 11, which is more ergonomic and allows the user to hold it more naturally and comfortably when operating the electric chain saw, effectively reducing hand fatigue during long-term operation. The first battery pack 40 is arranged behind the main handle 16, and the user's hand position is relatively fixed during operation, so the position of the first battery pack 40 does not interfere with hand operation, and its weight is distributed behind the hand, which helps to maintain balance during operation, further improving the comfort of operation. The bottom area of the main handle 16 and the shell 10 are located in the rear area of the driving motor 30 to form a containing space 17 for containing the second battery pack 41, which not only avoids the increase in volume caused by separately opening up space for the second battery pack 41, but also realizes the reasonable placement of the second battery pack 41, making the structure of the entire electric chain saw more compact, increasing the battery capacity in a limited space, improving the space utilization efficiency, and further optimizing the center of gravity distribution of the electric chain saw, making the device more stable during operation, reducing shaking and deviation.

[0047] In order to further make the structure of the electric chain saw more compact, in this embodiment, a first battery slot 13 is provided behind the main handle 16, which is recessed into the main handle 16, and a second battery slot 14 is provided at the bottom of the main handle 16, which is recessed into the main handle 16. This can effectively utilize the space inside the electric chain saw, allowing the battery pack to be installed to better fit the surface of the main handle 16, making the structure of the electric chain saw more compact and avoiding the battery pack protruding too much to affect holding. In addition, when used outdoors, the first battery pack 40 and the second battery pack 41 are detachable from the first battery slot 13 and the second battery slot 14, respectively, greatly simplifying the battery replacement process, and users can quickly replace the battery pack as needed.

[0048] In order to realize detachable connection, taking the first battery pack 40 as an example, the edge of the first battery slot 13 is provided with a elastic buckle, and the corresponding position of the first battery pack 40 has a clamping groove. When installing, align the first battery pack 40 with the first battery slot 13 and push it in, the elastic buckle is deformed under pressure, and after entering the clamping groove, it is locked by springing back, and the connection is firm. When disassembling, press the elastic buckle unlocking button, the elastic buckle retracts, and the first battery pack 40 can be removed. The installation and disassembly of the second battery pack 41 are the same as those of the first battery pack 40.

[0049] In order to make the cutting of the electric chain saw more stable, the first battery pack 40 is inclined from the left and right sides of the shell 10, and the included angle between the rear side plane of the first battery pack 40 and the bottom plane of the shell 10 is α, 110°≤α≤135°. By adjusting the angle of the first battery pack 40, the overall gravity distribution of the electric chain saw can be further optimized, which helps to improve the operation stability and balance of the electric chain saw, and makes the cutting process more stable. If the angle is less than 110°, the battery pack may be too vertical, which may cause the electric chain saw to have a high gravity center when held horizontally, and may easily shake and be unstable. If the angle is greater than 135°, the gravity center may be too biased to one side, which may easily shake and be unstable, and may also make the electric chain saw as a whole appear bulky, especially when working in a narrow space. In the embodiment, α is 120°, which can better distribute the overall weight of the electric chain saw, and make the gravity center more concentrated and stable. Of course, α can also be 125°, 130°, etc.

[0050]

[0051] Further, from the left and right sides of the shell 10, the plane where the bottom of the second battery pack 41 is located is parallel to the outermost end plane of the bottom of the shell 10, so that the structure of the electric chain saw is more flat. The plane where the bottom of the second battery pack 41 is located is higher than the outermost end plane of the bottom of the shell 10, and the appropriately raised position of the second battery pack 41 helps to adjust the overall gravity center of the electric chain saw, thereby helping to improve the operation experience of the electric chain saw.

[0052] Since the electric chain saw is often lighter at the front end than at the rear end, the lighter front end of the electric chain saw may easily cause a "floating" feeling during use, making it difficult for the user to push the electric chain saw to cut. Therefore, in the present application, the second battery pack 41 is located in front of the first battery pack 40 from the left and right sides of the shell 10, which can effectively adjust the gravity distribution in the front-rear direction of the electric chain saw. This change in gravity center can reduce the "floating" feeling caused by the lighter front end of the electric chain saw, making it more stable for the user to push the electric chain saw to cut.

[0053] It should be noted that the first battery pack 40 and the second battery pack 41 can be lithium batteries. Compared with traditional nickel-cadmium or lead-acid batteries, lithium batteries are lighter in weight. This helps to reduce the overall weight of the electric chain saw, thereby reducing the fatigue of the user's wrist and arm during long-time operation. In the same volume or weight, lithium batteries can store more electric energy and provide longer working time without adding extra weight.

[0054] ​Further, viewed from the left side of the shell 10, the top profile line of the holding area 11 on the shell 10 is in a gradually descending inclined state from front to back, the inclined design is matched with the hand and arm posture when the user holds the electric chain saw, and better human-computer interaction can be realized, when the user holds the electric chain saw and operates, the arm and wrist can be placed more naturally, fatigue caused by unreasonable shape of the shell 10 is reduced, and the comfort and convenience of operation are improved.

[0055] It can be understood that, in other embodiments, viewed from the left and right sides of the shell, the plane where the bottom of the second battery pack is located is flush with the outermost end plane of the bottom of the shell, which helps to realize good balance of the whole electric chain saw, which can avoid the problem of gravity center deviation caused by too high or too low position of the second battery pack as much as possible, so that the electric chain saw is more stable during use, and the electric chain saw is also convenient to place.

[0056] It can be understood that, in other embodiments, the right side of the shell is provided with an auxiliary handle, and the auxiliary handle provides an additional holding point, so that the operator can adopt a more stable two-handed operation mode, and the stable holding mode greatly reduces the shaking of the electric chain saw, so that the chain runs more smoothly.

[0057] In addition to the preferred embodiments described above, the utility model also has other implementation manners, based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of the utility model claimed.

Claims

1. An electric chain saw comprising a housing (10), a guide bar (20), and a chain (21) wound around the guide bar (20), a drive motor (30) for driving the chain (21) wound around the guide bar (20) to rotate being provided in the housing (10), characterized in that, The shell (10) is provided with a holding area (11) above, the first battery group (40) is provided behind the holding area (11), the second battery group (41) is provided below the holding area (11), the second battery group (41) is located behind the driving motor (30), and the first battery group (40) and the second battery group (41) are used for power supply of the driving motor (30).

2. The electric chainsaw according to claim 1, characterized in that, From the rear side of the shell (10), the center of gravity of the first battery group (40) coincides with the parting line (12) of the shell (10) as the reference.

3. The electric chainsaw according to claim 1, characterized in that, From the rear side of the shell (10), the center of gravity of the second battery group (41) is located in the range of -25mm to 25mm of the shell (10) in the direction perpendicular to the parting line (12).

4. The electric chainsaw according to claim 1, characterized in that, From the left and right sides of the shell (10), the first battery group (40) is arranged obliquely, the included angle between the rear side plane of the first battery group (40) and the bottom plane of the shell (10) is α, and 110°≤α≤135°.

5. The electric chainsaw according to claim 1, characterized in that, The shell (10) is provided with a main handle (16) above, the main handle (16) is arranged around the shell (10) to form the holding area (11), the first battery group (40) is arranged behind the main handle (16), and the bottom area of the main handle (16) and the shell (10) are located in the rear area of the driving motor (30) to form a containing space (17) containing the second battery group (41).

6. The electric chain saw according to claim 5, characterized in that The rear of the main handle (16) is provided with a first battery slot (13) recessed into the main handle (16), the bottom of the main handle (16) is provided with a second battery slot (14) recessed into the main handle (16), and the first battery group (40) and the second battery group (41) are respectively detachable from the first battery slot (13) and the second battery slot (14).

7. The electric chainsaw according to claim 1, characterized in that, From the left and right sides of the shell (10), the plane where the bottom of the second battery group (41) is located is parallel to the outermost end plane of the bottom of the shell (10).

8. The electric chainsaw of claim 1, wherein, From the left and right sides of the shell (10), the plane where the bottom of the second battery group (41) is located is not lower than the outermost end plane of the bottom of the shell (10).

9. The electric chainsaw of claim 1, wherein, From the left and right sides of the shell (10), the second battery group (41) is located in front of the first battery group (40).

10. The electric chainsaw according to claim 1, characterized in that, From the rear side of the shell (10), the first battery group (40) is vertically arranged, and the second battery group (41) is horizontally arranged.

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