CN220963626U - Battery pack and garden tool system - Google Patents

Abstract

The utility model provides a battery pack and a gardening tool system, wherein the battery pack comprises: the battery cell comprises a shell, a battery cell unit, a first handle and a second handle. A containing cavity is arranged in the shell; the battery cell unit is arranged in the accommodating cavity; a first handle mounted on the housing and configured to pull the battery pack in a first direction; a second handle is mounted on the housing and configured to pull the battery pack in a second direction. The battery pack can solve the problem that the existing battery pack cannot adapt to different carrying requirements.

Description

Battery pack and garden tool system

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack and a gardening tool system.

Background

In recent years, with the development of battery material technology, the application range of various battery packs has been greatly increased, and the battery packs extend from some low-power electronic electric devices to some high-power electric devices; then, the existing battery pack often only has one handle for carrying, however, as the use scene of the battery pack becomes diversified, especially when the space is limited, only one handle for carrying brings inconvenience to staff, and the requirement of customers cannot be met, so that a novel battery pack and a gardening tool system comprising the battery pack are needed to be provided.

Disclosure of utility model

In view of the above drawbacks of the prior art, the present utility model is directed to a battery pack and a gardening tool system, so as to solve the problem that the existing battery pack has only one handle and cannot adapt to different carrying requirements.

To achieve the above and other related objects, the present utility model provides a battery pack comprising: the battery cell comprises a shell, a battery cell unit, a first handle and a second handle. A containing cavity is arranged in the shell; the battery cell unit is arranged in the accommodating cavity; a first handle mounted on the housing and configured to pull the battery pack in a first direction; a second handle is mounted on the housing and configured to pull the battery pack in a second direction.

In one example of the battery pack of the present utility model, the first direction and the second direction are disposed perpendicular to each other.

In one example of the battery pack of the present utility model, the first handle is symmetrical in that the plane of symmetry of the first handle is located in a first vertical plane passing through the center of gravity of the battery pack when the first handle is lifted, and/or the second handle is symmetrical in that the plane of symmetry of the second handle is located in a second vertical plane passing through the center of gravity of the battery pack when the second handle is lifted.

In an example of the battery pack of the present utility model, the first handle is of a symmetrical structure, and when the first handle is lifted, a distance between a symmetry plane of the first handle and a first vertical plane passing through the center of gravity of the battery pack is smaller than a first set distance, and/or the second handle is of a symmetrical structure, and when the second handle is lifted, a distance between a symmetry plane of the second handle and a second vertical plane passing through the center of gravity of the battery pack is smaller than a second set distance.

In one example of the battery pack of the present utility model, the first set distance is 0 to 25mm, and the second set distance is 0 to 15mm.

In an example of the battery pack, a first placing surface for placing the battery pack is arranged on one side, away from the first lifting handle, of the shell, a second placing surface for placing the battery pack is arranged on one side, away from the second lifting handle, of the shell, and the distance from the center of gravity of the battery pack to the first placing surface is not equal to the distance from the center of gravity of the battery pack to the second placing surface.

In one example of the battery pack of the present utility model, the distance from the center of gravity of the battery pack to the first placement surface is 100mm to 150mm.

In one example of the battery pack of the present utility model, the distance from the center of gravity of the battery pack to the second placement surface is 150mm to 250mm.

In an example of the battery pack of the present utility model, the housing includes a plurality of wall surfaces, and the first handle and/or the second handle are disposed at a middle portion of the corresponding wall surface.

In an example of the battery pack of the present utility model, a plurality of protruding portions are formed at the connection positions of the plurality of wall surfaces, and the battery pack further includes a buffer body, wherein the buffer body at least covers one protruding portion.

In an example of the battery pack of the present utility model, the buffer body covers all the protruding portions, and on the same wall surface, the case between adjacent protruding portions is exposed to the outside of the buffer body to form an exposed portion, and the surface of the buffer body at the protruding portion position on both sides is higher than the surface of the exposed portion along the direction perpendicular to the wall surface.

In one example of the battery pack of the present utility model, the buffer surfaces on both sides are at least 0.2mm higher than the surface of the exposed portion on the same wall surface.

The present utility model also provides a garden tool system, comprising a garden tool and a battery pack connected to the garden tool, the battery pack comprising: the battery pack includes: the battery cell comprises a shell, a battery cell unit, a first handle and a second handle. A containing cavity is arranged in the shell; the battery cell unit is arranged in the accommodating cavity; a first handle mounted on the housing and configured to pull the battery pack in a first direction; a second handle is mounted on the housing and configured to pull the battery pack in a second direction.

In the battery pack and the gardening tool system, the first handle and the second handle are respectively arranged on the battery pack, operators can select different handles to carry according to the needs so as to meet the requirements of different spaces, and meanwhile, when the battery pack is large in size, the first handle and the second handle can be respectively carried by two operators to cooperatively work, so that the battery pack can adapt to various requirements and has larger flexibility.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a three-dimensional schematic view of an embodiment of a battery pack according to the present utility model;

FIG. 2 is a schematic three-dimensional view of a battery pack according to an embodiment of the present utility model with a portion of the housing removed;

FIG. 3 is a front view of an embodiment of a battery pack of the present utility model;

FIG. 4 is a cross-sectional view taken along the direction A-A in FIG. 3;

FIG. 5 is an exploded view of the first handle/second handle of one embodiment of the battery pack of the present utility model;

FIG. 6 is a three-dimensional schematic view of a first housing of an embodiment of a battery pack of the present utility model;

fig. 7 is a three-dimensional cross-sectional view of a first housing of an embodiment of a battery pack of the present utility model;

fig. 8 is a three-dimensional schematic view of a second housing of an embodiment of a battery pack according to the present utility model;

Fig. 9 is a three-dimensional cross-sectional view of a second housing of an embodiment of a battery pack of the present utility model;

fig. 10 is an exploded view of the first case and the buffer body of the battery pack according to the present utility model.

Description of element reference numerals

100. A housing; 110. a first housing; 120. a second housing; 130. a receiving chamber; 140. a buffer body; 101. a first wall surface; 1011. a first concave portion; 1012. a first exposed portion; 102. a first placement surface; 1021. a second concave portion; 1022. a second exposed portion; 103. a second wall surface; 1031. a third recess; 1032. a third exposed portion; 104. a second placement surface; 1041. a fourth concave portion; 1042. a fourth exposed portion; 105. a third wall surface; 1051. a first heat dissipation area; 106. a fourth wall surface; 1061. a second heat dissipation area; 107. a convex portion; 200. a cell unit; 210. a first bracket; 220. a battery cell; 230. a second bracket; 240. a bolt assembly; 300. a first handle; 310. a skeleton; 320. a protective layer; 330. briquetting; 400. and a second handle.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or identical to the methods, apparatus, or materials of the embodiments of the utility model may be used to practice the utility model.

Referring to fig. 1 to 9, the present utility model provides a battery pack and a gardening tool system, wherein the battery pack is respectively provided with a first handle 300 and a second handle 400, so that operators can select different handles to carry according to needs on one hand, and on the other hand, when the battery pack is large, the operators can also carry the first handle and the second handle to cooperatively operate through respectively carrying the first handle and the second handle by two operators, so that the problem that the existing battery pack has only one handle and cannot adapt to different carrying requirements can be solved.

Referring to fig. 1 and 2, the battery pack includes: the battery cell unit 200 includes a housing 100, a battery cell unit 200, a first handle 300, and a second handle 400.

Referring to fig. 1 and 2, the housing 100 is provided with a receiving cavity 130, and it should be noted that the housing 100 may be one housing unit integrally formed outside the battery cell 200, or may be formed by combining two or more housing units. The accommodating chamber 130 may be integrally formed on one housing unit or may be surrounded by a plurality of housing units. In this embodiment, the housing 100 has an approximately rectangular parallelepiped structure formed by combining the first housing 110 and the second housing 120, and the first housing 110 and the second housing 120 are connected and jointly enclose a containing cavity 130; the connection between the first housing 110 and the second housing 120 includes, but is not limited to, bolting, and may be adhesive or integrally formed in other embodiments without considering the convenience of disassembly.

Referring to fig. 1, 3 and 4, in particular, in the present embodiment, the housing 100 has an approximately rectangular parallelepiped shape, and corresponds to six faces of the rectangular parallelepiped, and the housing 100 specifically includes a first wall 101, a first placement surface 102, a second wall 103, a second placement surface 104, a third wall 105 and a fourth wall 106. The first placement surface 102 is used for placing the battery pack in a first direction (i.e., the height direction is along the Y direction in fig. 1), and the second placement surface 104 is used for placing the battery pack in a second direction (i.e., the height direction is along the X direction in fig. 1). The first placing surface 102 and the first wall surface 101 are respectively disposed at two sides of the housing 100, the battery pack includes a first handle 300, and the first handle 300 is mounted on the first wall surface 101. The second wall surface 103 and the second placing surface 104 are oppositely arranged on two sides of the casing 100, the first wall surface 101, the second wall surface 103, the first placing surface 102 and the second placing surface 104 are sequentially connected and encircle to form a closed-loop wall body, the battery pack further comprises a second handle 400, and the second handle 400 is mounted on the second wall surface 103. The battery pack further comprises a third wall surface 105 and a fourth wall surface 106 which are oppositely arranged, wherein the third wall surface 105 and the fourth wall surface 106 are respectively blocked at two sides of the closed-loop wall body along the Z-axis direction so as to form the accommodating cavity 130 in a blocking manner; for convenience of distinction, referring to fig. 4, the heat dissipation area on the third wall 105 is designated as a first heat dissipation area 1051, and the heat dissipation area on the fourth wall 106 is designated as a second heat dissipation area 1061. However, it will be understood by those skilled in the art that the first heat dissipation area 1051 may be provided only on the third wall 105 or the second heat dissipation area 1061 may be provided only on the middle of the fourth wall 106 if the heat dissipation requirement is satisfied.

Referring to fig. 2 and 4, the battery cell 200 is disposed in the accommodating cavity 130 and includes a plurality of battery cells 220. The shape of the battery cell 200 may be a different profile formed by stacking a plurality of battery cells 220, such as an approximately rectangular parallelepiped profile, or an approximately cylindrical profile, as long as it can be accommodated in the accommodating chamber 130. In this embodiment, in order to obtain a larger energy density in accordance with the shape of the accommodating cavity 130, the shape of the plurality of cells 220 in the cell unit 200 in this embodiment is matched with the shape of the accommodating cavity 130. The stacking arrangement of the battery cells 220 in the battery module is not limited, for example, the stacking arrangement can be realized by a bracket or a battery cell tray, etc., referring to fig. 2 and 4, the battery cell unit 200 of this embodiment includes a first bracket 210, a second bracket 230 and a plurality of battery cells 220, positioning structures matched with the shapes of the battery cells 220 are provided on the first bracket 210 and the second bracket 230, the positioning structures include, but are not limited to, positioning holes matched with the shapes of the battery cells 220, etc., the battery cells 220 are not limited in shape, and can be square-shell battery cells, cylindrical battery cells, etc., in this embodiment, the battery cells are cylindrical, the plurality of cylindrical battery cells are arrayed, the first bracket 210 and the second bracket 230 are respectively provided at two axial ends of the cylindrical battery cells, and are connected with each other by a bolt assembly 240, so as to clamp the plurality of cylindrical battery cells from two axial ends of the plurality of cylindrical battery cells, thereby forming an integrally detachable module. It should be noted that the battery cell unit 200 may also include other components, such as a battery management unit, a current collecting member, etc., which are not described herein.

The first handle 300 may be any suitable handle structure capable of implementing a lifting function, or may be a handle standard component capable of being obtained by a general commercial means, specifically, in this embodiment, the first placement surface 102 and the first wall surface 101 are respectively located at two sides of the battery pack along the first direction (i.e. the Y-axis direction), the first handle 300 may be disposed at any position on the first wall surface 101, preferably, may be disposed in the middle of the first wall surface 101, and the lifting direction is disposed along the first direction (Y-axis direction in fig. 1) of the battery pack. When the battery pack is lifted by the first handle 300, the first wall surface 101 becomes an upper surface and the first placing surface 102 becomes a lower surface under the combined action of the lifting force and the gravity, and the first placing surface 102 is disposed at the other side of the housing 100 opposite to the first wall surface 101 and perpendicular to the first direction so as to be placed on a fixed plane through the first placing surface 102 after the lifting. It should be noted that other concave structures may be disposed on the first placement surface 102, so long as the first placement surface 102 does not interfere with the contact between the table top or the ground.

The second handle 400 may be any suitable handle structure capable of performing a lifting function, or may be a handle standard member that can be obtained by a general commercial means, and in this embodiment, the second handle 400 may be disposed at any position on the second wall 103, preferably, may be disposed in the middle of the second wall 103, and the lifting direction is disposed along the second direction (i.e., the X direction in fig. 1) of the battery pack. The second placing surface 104 is disposed at the other side of the housing 100 opposite to the second wall surface 103 so as to be placed on a fixed plane by the second placing surface 104 after being lifted. Through setting up first handle 300 and second handle 400 simultaneously, operating personnel can select different handles to carry as required to satisfy the demand in different spaces, also can carry first handle and second handle respectively through two operating personnel when the battery package volume is great simultaneously and come collaborative operation, can adapt to multiple demand, have great flexibility.

In the present utility model, the first direction and the second direction may be crossed or parallel to each other, referring to fig. 3, in this embodiment, the first direction and the second direction are perpendicular to each other, the distance between the first wall surface 101 and the first placement surface 102 is L1, the distance between the second wall surface 103 and the second placement surface 104 is L2, and the distance L1 and the distance L2 are not equal, so that an operator can pull the battery pack from different directions according to needs on one hand, and can select the pulling direction according to space needs on the other hand. Preferably, in an embodiment, the distance H1 from the center of gravity G of the battery pack to the first placement surface 102 is not equal to the distance H2 from the center of gravity G of the battery pack to the second placement surface 104, so that a suitable center of gravity height can be selected according to the external environment or the center of gravity requirement of the external device. Considering the specifications, weight and size of the existing battery pack, in an embodiment, the distance H1 of the center of gravity G of the battery pack to the first placement surface 102 may be any one of 100mm to 150mm, for example, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, etc. The distance H2 from the center of gravity G of the battery pack to the second placement surface 104 may be any one of 150mm to 250mm, for example, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, etc.

Specifically, referring to fig. 3 and 5, in the embodiment, the first handle 300 is of a symmetrical structure, the first handle 300 also includes an elongated framework 310 and a protective layer 320 covering the elongated framework 310, and two ends of the framework 310 are fixedly mounted on the first wall 101 by a pressing block 330 and bolts. A first recess 1011 is provided on the first wall 101 at a position corresponding to the first handle 300 to form a large space for a finger to pass through between the first handle 300 and the first wall 101. The second recess 1021 is provided in the middle of the first placement surface 102, so as to reduce the contact area of the first placement surface 1021, and improve placement stability. When the first handle 300 is pulled, the symmetry plane of the first handle 300 is located in a first vertical plane passing through the center of gravity G of the battery pack. The arrangement can make the battery pack more stable when carrying and drawing the first handle 300 on the one hand, and on the other hand can make the battery pack focus on the extension line of arm overhang direction at the in-process of carrying and drawing the first handle 300, can reduce the tired sense when carrying and drawing.

Specifically, referring to fig. 3 and 5, in the present embodiment, the second handle 400 is also symmetrical, and the second handle 400 is identical to the first handle 300 in structure so as to have interchangeability. The second handle 400 also includes an elongated frame 310 and a protective layer 320 covering the elongated frame 310, where two ends of the frame 310 are fixedly mounted on the second wall 103 by a pressing block 330 and bolts. A third recess 1031 is provided on the second wall 103 at a position corresponding to the second handle 400, so as to form a large space between the second handle 400 and the second wall 103 for a finger to pass through. The fourth recess 1041 is disposed in the middle of the second placement surface 104, so as to reduce the contact area of the second placement surface 1041, and improve the placement stability. When the second handle 400 is pulled, the symmetry plane of the second handle 400 is located in a second vertical plane passing through the center of gravity G of the battery pack. The arrangement can make the battery package more stable when carrying and pulling the second handle 400 on the one hand, and on the other hand can make battery package focus G on the extension line of arm overhang direction at the in-process of carrying and pulling the second handle 400, can reduce the tired feel when carrying and pulling. Of course, in other embodiments, if the above benefits are not considered, the symmetry plane of the first handle 300 may be located in a first vertical plane passing through the center of gravity of the battery pack only when the first handle 300 is pulled, or the symmetry plane of the second handle 400 may be located in a second vertical plane passing through the center of gravity of the battery pack only when the second handle 400 is pulled.

In another embodiment of the battery pack according to the present utility model, the first handle 300 has a symmetrical structure, and when the first handle 300 is pulled, the distance between the symmetry plane of the first handle 300 and the first vertical plane passing through the center of gravity of the battery pack is smaller than a first set distance, which is set according to the volume and weight of the battery pack, preferably, in consideration of the specification, weight and size of the existing battery pack, the first set distance may be any value of 0 to 25mm, for example, 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, etc. The second handle 400 is also of a symmetrical structure, and when the second handle 400 is pulled, the distance between the symmetrical surface of the second handle 400 and the second vertical plane passing through the center of gravity of the battery pack is smaller than the second set distance. The second set distance is set according to the volume and weight of the battery pack, and preferably, in consideration of the specification, weight and size of the existing battery pack, in an embodiment, the second set distance may be any value from 0 to 15mm, for example, 0mm, 5mm, 10mm, 15mm, etc. However, in other embodiments, the first set distance may be limited to only 0 to 25mm, and the second set distance may not be limited, or the second set distance may be limited to only 0 to 15mm, and the first set distance may not be limited.

In the battery pack of the present utility model, a plurality of protrusions 107 are formed at the connection position of the plurality of wall surfaces, and the protrusions 107 are located at the connection position of the three wall surfaces, for example, at the top of a cuboid, or may be located at the edge of a cuboid, for example, may be in a sharp shape like the top of a cuboid, or may be in a rounded arc-shaped protrusion, in which the protrusions 107 are disposed at the top position of the case 100 and include rounded arc surfaces, and the forming manner of the rounded arc surfaces includes, but is not limited to, forming by rounded corners from the top position of the cuboid through rounded corners or forming by rounded corners from adjacent surfaces, and then rounding edges formed by the rounded corners. The rounded surface may provide a more attractive appearance to the battery pack, on the one hand, and may reduce stress concentration points of the case 100, on the other hand.

Referring to fig. 10, in an embodiment of the present utility model, the battery pack further includes a buffer body 140, at least one protrusion 107 is covered by the buffer body 140 to protect the battery pack during the falling process of the battery pack, and as long as one protrusion 107 is covered by the buffer body 140, the battery pack can be protected when the protrusion 107 collides with the outside. The material of the buffer body 140 may be any suitable material capable of absorbing energy in the collision process, including but not limited to materials such as silica gel, rubber, TPE material TPR material, etc., the buffer body 140 may be coated on the convex portion 107 in a bonding manner or may be sleeved outside the housing 100, preferably, the buffer body 140 is coated on the convex portion 107 of the housing 100 through a coating process, and the buffer body 140 formed on the surface of the housing 100 is coated through a coating process, so that the anti-slip performance is good, the elastic touch feeling is good, the touch feeling of the product can be improved, and the holding performance is enhanced.

Referring to fig. 3 and 10, although the battery pack of the present utility model may cover the buffer body 140 over the entire surface of the battery pack, in an example of the battery pack of the present utility model, the housing 100 between adjacent protrusions 107 is exposed to the buffer body 140 to form an exposed portion on the same wall surface, and the region between the protrusions 107 on the left and right sides of the first wall surface 101 corresponding to the lower portion of the first handle 300 is exposed to the outside of the buffer body 140 to form a first exposed portion 1012; the area between the convex parts 107 on the left and right sides of the first placing surface 102 is exposed out of the buffer body 140 to form a second exposed part 1022; the right area of the second handle 400 between the convex parts 107 on the upper and lower sides of the second wall 102 is exposed to the outside of the buffer body 140 to form a third exposed part 1032; the area between the convex parts 107 on the upper and lower sides of the fourth placement surface 104 is exposed to the outside of the buffer body 140 to form a fourth exposed part 1042. The arrangement of the exposed part can expose the surface of the shell 100, reduce the thickness of heat conduction, increase the heat dissipation efficiency, reduce the encapsulated area and save the cost. In an embodiment of the present utility model, along the direction perpendicular to the wall surface, the surface of the buffer body 140 at the position of the protruding portion 107 on both sides is higher than the surface of the corresponding exposed portion, that is, the surface of the buffer body 140 on both sides is at least higher than the surface of the corresponding exposed portion on the middle portion, so as to prevent the exposed portion from directly contacting the ground during the falling process, thereby preventing the protection failure of the buffer body. Preferably, considering the material properties of the existing buffer body, in an embodiment of the present utility model, the surface of the buffer body 140 on both sides is at least 0.2mm higher than the surface of the exposed portion on the same wall surface, so that the exposed portion is prevented from contacting the ground during the falling process under the condition that the buffer body 140 is not fully deformed to absorb energy, thereby causing damage.

The present utility model also provides a garden tool system, which comprises a garden tool and a battery pack connected with the garden tool. The battery pack may be the battery pack in any of the above embodiments. Garden tools include, but are not limited to, lawnmowers, grass clippers, snowplows, backpacks, powerheads, garden off-road vehicles, and the like. Referring to fig. 1 to 3, the battery pack includes: the battery cell unit 200 includes a housing 100, a battery cell unit 200, a first handle 300, and a second handle 400. A receiving chamber 130 is provided in the housing 100; the battery cell unit 200 is disposed in the accommodating cavity 130 and includes a plurality of battery cells 220; the first handle 300 is mounted on the housing 100 and is configured to pull the battery pack 10 in a first direction; a second handle 400 is mounted to the housing 100 and is configured to pull the battery pack in a second direction.

According to the battery pack, the first handle and the second handle are arranged at different positions respectively, operators can select different handles to carry according to needs so as to meet the requirements of different spaces, and meanwhile, when the battery pack is large in size, the first handle and the second handle can be carried by two operators respectively to cooperatively operate, so that the battery pack can adapt to various requirements, and has larger flexibility. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (13)

1. A battery pack, comprising:

the shell is internally provided with a containing cavity;

the battery cell unit is arranged in the accommodating cavity;

A first handle mounted on the housing and configured to pull the battery pack in a first direction;

And a second handle mounted on the housing and configured to pull the battery pack in a second direction.

2. The battery pack of claim 1, wherein the first direction and the second direction are disposed perpendicular to each other.

3. The battery pack of claim 1, wherein the first handle is symmetrical in that the first handle symmetry plane is located in a first vertical plane passing through the center of gravity of the battery pack when the first handle is pulled, and/or the second handle is symmetrical in that the second handle symmetry plane is located in a second vertical plane passing through the center of gravity of the battery pack when the second handle is pulled.

4. The battery pack according to claim 1, wherein the first handle is of a symmetrical structure, a distance between a symmetry plane of the first handle and a first vertical plane passing through a center of gravity of the battery pack is smaller than a first set distance when the first handle is lifted, and/or the second handle is of a symmetrical structure, and a distance between a symmetry plane of the second handle and a second vertical plane passing through a center of gravity of the battery pack is smaller than a second set distance when the second handle is lifted.

5. The battery pack of claim 4, wherein the first set distance is 0 to 25mm and the second set distance is 0 to 15mm.

6. The battery pack according to claim 1, wherein a first placement surface for placing the battery pack is provided on a side of the housing facing away from the first handle, a second placement surface for placing the battery pack is provided on a side of the housing facing away from the second handle, and a distance from a center of gravity of the battery pack to the first placement surface is not equal to a distance from the center of gravity of the battery pack to the second placement surface.

7. The battery pack of claim 6, wherein a distance from a center of gravity of the battery pack to the first placement surface is 100mm to 150mm.

8. The battery pack of claim 6, wherein a distance from a center of gravity of the battery pack to the second placement surface is 150mm to 250mm.

9. The battery pack according to claim 1, wherein the housing comprises a plurality of wall surfaces, and the first handle and/or the second handle are/is disposed in a middle portion corresponding to the wall surfaces.

10. The battery pack according to claim 9, wherein a plurality of convex portions are formed at the connection positions of the plurality of wall surfaces, the battery pack further comprising a buffer body that covers at least one of the convex portions.

11. The battery pack according to claim 10, wherein the buffer body covers all the convex portions, the case between adjacent convex portions is exposed to the outside of the buffer body on the same wall surface to form an exposed portion, and the surface of the buffer body at the convex portion position on both sides is higher than the surface of the exposed portion in the direction perpendicular to the wall surface.

12. The battery pack of claim 11, wherein the buffer surfaces on both sides are at least 0.2mm above the surface of the exposed portion on the same wall surface.

13. A garden tool system comprising a garden tool and a battery pack connected to the garden tool, characterized in that: the battery pack includes:

the shell is internally provided with a containing cavity;

the battery cell unit is arranged in the accommodating cavity;

A first handle mounted on the housing and configured to pull the battery pack in a first direction;

And a second handle mounted on the housing and configured to pull the battery pack in a second direction.