Battery pack shell, battery pack and electric tool

Abstract

The utility model discloses a battery pack shell, a battery pack and an electric tool, a battery core accommodating cavity (101) is arranged in the battery pack shell, at least one wall structure (103) is arranged between the outer wall of the battery core accommodating cavity and the battery pack shell, and the wall structure, the battery pack shell and the outer wall of the battery core accommodating cavity define a plurality of closed cavities (102). And when the battery pack shell is subjected to impact force, the cavity can deform to absorb the impact force. The battery pack shell can absorb impact kinetic energy when the battery pack is collided or impacted, so that the battery cells are better protected, and the safety risk caused by deformation of the battery cells is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shell structure, especially a shell structure for a battery pack. BACKGROUND

[0002] For power tools using battery packs, safety risks that can be encountered need to be considered. For example, power tools can be used for high-altitude work, and if they fall accidentally from a high altitude, a great impact on the battery pack will occur, at which time the battery cell is squeezed and the risk of explosion and fire is easily caused.

[0003] Therefore, in order to better protect the battery pack, protective measures need to be provided for the battery pack. Some current methods are to design the overall layout of the electric tool itself so that the battery pack is located in a position that cannot be collided when the tool falls. However, this setting method is limited by the design of the electric tool itself, and the space for design adjustment is limited, and the adaptability is poor.

[0004] In addition, some methods are to wrap some buffer layers around the battery pack or to increase the setting of protective fences. However, this setting method needs to increase additional elements outside the battery pack, which increases the complexity of the structure of the battery pack, and in addition, the external buffer layer or protective fence is also easily damaged in the use process of the battery pack. SUMMARY

[0005] One of the purposes of the utility model is to provide a battery pack shell, which can absorb impact kinetic energy when the battery pack collides or is impacted, thereby better protecting the battery cell and reducing the safety risks caused by the deformation of the battery cell.

[0006] In order to achieve the above purpose, the utility model provides a battery pack shell, which has a battery cell containing cavity inside, at least one wall structure is provided between the outer wall of the battery cell containing cavity and the battery pack shell, and the wall structure, the battery pack shell and the outer wall of the battery cell containing cavity enclose a plurality of closed cavities. When the battery pack shell is impacted, the cavities are deformed to absorb the impact force, thereby playing a buffering role.

[0007] Further, the battery pack shell according to the utility model comprises a first shell and a second shell which are separately arranged and connected together, the battery cell containing cavity is arranged on the second shell, and the first shell and the second shell are connected together to enclose the closed cavities with the wall structure and the outer wall of the battery cell containing cavity.

[0008] Further, in the battery pack shell according to the utility model, the Young's modulus of the second shell is less than the Young's modulus of the first shell.

[0009] Further, the difference between the Young's modulus of the second shell and the Young's modulus of the first shell is 600-3500 MPa.

[0010] Further, the first shell is provided with a rib plate protruding from the surface on the inner side, the second shell is provided with a clamping groove, and the end of the rib plate is correspondingly inserted into the clamping groove.

[0011] Further, the rib plate is arranged at the axial end surface of the battery cell accommodating cavity.

[0012] Further, at least one of the cavities is arranged through the battery pack shell in at least one full size direction.

[0013] Further, at least one of the cavities is arranged at the corner of the battery pack shell.

[0014] Further, at least one of the cavities extends along the axial direction of the battery cell accommodating cavity and is arranged below the battery cell accommodating cavity.

[0015] Further, at least one of the cavities is provided with a buffer element.

[0016] Further, the buffer element is arranged in the cavity at the corner of the battery pack shell.

[0017] Further, the buffer element comprises an elastic filler and / or a spring sheet.

[0018] Another purpose of the present application is to provide a battery pack with high safety performance.

[0019] Based on the above purpose, the present application further provides a battery pack comprising the battery pack shell as described above, and the battery cell accommodating cavity of the battery pack shell is provided with a battery cell.

[0020] In addition, another purpose of the present application is to provide an electric tool with high use safety and good use experience.

[0021] Based on the above purpose, the present application further provides an electric tool provided with the battery pack as described above.

[0022] The battery pack shell has simple and compact structure and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The external structure of the battery pack shell in an embodiment is schematically shown.

[0024] Figure 2 The internal structure of the battery pack shell in an embodiment is shown.

[0025] Figure 3 The structure of the first shell in an embodiment of the battery pack shell is shown.

[0026] Figure 4 The impact force borne by the battery pack shell in an embodiment is schematically shown.

[0027] Figure 5 The clamping groove of the battery pack shell in an embodiment is shown.

[0028] Figure 6 The cavity of the battery pack shell in an embodiment is shown from a front perspective.

[0029] Figure 7 The setting position of the cavity of the battery pack shell in an embodiment is shown.

[0030] Figure 8 The buffer element of the battery pack shell in an embodiment is shown. DETAILED DESCRIPTION

[0031] The battery pack shell, the battery pack and the electric tool of the present application will be further explained and described in conjunction with the drawings of the specification and the specific embodiments, however, the explanation and description do not constitute undue limitation on the technical solutions of the present application.

[0032] For the electric tool using the battery pack, the safety risks that may be faced need to be considered. For example, when the battery pack is collided or impacted, the battery cell is extruded, and the risk of explosion and fire is prone to occur. Therefore, in order to better protect the battery pack, protection measures need to be provided for the battery pack.

[0033] The current solution is to arrange the battery pack in a position that cannot be collided when the tool falls through the overall layout design of the electric tool itself. However, this arrangement is limited by the design of the electric tool itself, and the space for design adjustment is limited, and the adaptability is poor.

[0034] In addition, some solutions involve wrapping the battery pack with buffer layers or adding protective barriers. However, this approach requires adding extra components to the outside of the battery pack, increasing the complexity of the battery pack structure. Furthermore, the external buffer layers or protective barriers are prone to damage during battery pack use.

[0035] To address this issue, this invention provides a battery pack housing in one embodiment that provides effective protection for the battery cells with a simple structural design.

[0036] Figure 1 The diagram schematically illustrates the external structure of the battery pack housing according to one embodiment of the present invention.

[0037] like Figure 1 As shown, in some embodiments, the battery pack housing 100 is configured as a protective casing that surrounds the battery cells.

[0038] Figure 2 The internal structure of the battery pack housing according to this invention is shown in one embodiment.

[0039] like Figure 2 As shown, in some embodiments, the battery pack casing has a plurality of cell-accommodating cavities 101 inside for placing battery cells. Furthermore, at least one wall structure 103 is provided between the outer wall of the cell-accommodating cavity 101 and the battery pack casing. This wall structure 103, together with the battery pack casing 100 and the outer wall of the cell-accommodating cavity 101, forms a plurality of closed cavities 102. When the battery pack casing is subjected to an impact force, the cavities 102 can deform to absorb the impact force, thereby providing a cushioning effect.

[0040] It should be noted that, Figure 2 To clearly show the cavity, a portion of the housing was removed. This was done when the removed portion of the housing was installed... Figure 2 When it is placed on the shell shown, a closed cavity will be formed.

[0041] For example, in some specific embodiments, for ease of installation, the battery pack housing may include a first housing 110 that is separately configured and connected together (e.g., as shown in the image). Figure 3 (as shown) and the second housing 120. In some more specific embodiments, the first housing and the second housing can be connected by bolts disposed in screw holes 121.

[0042] The cell housing 101 is disposed on the second housing 120. When the first housing 110 and the second housing 120 are assembled together, a number of closed cavities 102 are formed. These closed cavities form a cushioning structure similar to an airbag.

[0043] like Figure 4 As shown, when the battery pack casing is impacted, several cavities 102 deform, gradually absorbing and transmitting the impact force F, thereby achieving better protection of the battery pack.

[0044] It should be noted that, although Figure 2 Six cavities are shown schematically, but the present invention can also provide other numbers of cavities.

[0045] In some more specific embodiments, the first housing 110 and the second housing 120 are made of different materials. The Young's modulus of the second housing 120 is less than that of the first housing 110, meaning the second housing is softer than the first housing. With this arrangement, when the battery pack is impacted, the relatively soft second housing 120, with its superimposed cavity, first absorbs the impact force. After the cavity has fully deformed, the impact force is transmitted to the first housing 110. Because the first housing is relatively rigid, it provides strong support, preventing further deformation of the second housing. Thus, the first housing 110 and the second housing 120 work together to better protect the battery cells.

[0046] In some more specific embodiments, the difference between the Young's modulus of the second housing 120 and the Young's modulus of the first housing 110 can be 600-3500 MPa.

[0047] In a more specific example, the second shell can be made of PC-ABS (polycarbonate-acrylonitrile-butadiene-styrene copolymer) with a Young's modulus of 2000MPa-2800MPa, and the first shell can be made of PA (polyamide) with a Young's modulus of 3000MPa-5000MPa.

[0048] like Figure 3 As shown, in some more specific embodiments, the inner surface of the first housing 110 is provided with ribs 111 that protrude from the surface, correspondingly, as... Figure 5 As shown, the second housing is provided with a slot 122, and the end of the rib 111 is inserted into the slot 122. This structure can be inserted into the first housing and the second housing after assembly, which plays a positioning role. In addition, the rib also plays a reinforcing role, thereby preventing the first housing from deforming when the battery pack is impacted.

[0049] In some more specific embodiments, after the first housing and the second housing are assembled, the rib 111 is located at the axial end face of the cell housing cavity. In this way, the rib can also fix the cell, preventing the cell from axially shifting when the battery pack is dropped, thus preventing unpredictable failure.

[0050] It should be noted that Figure 3 And Figure 5 The number of the rib plates and the clamping grooves is two pairs, which is only exemplary. In other embodiments, rib plates can also be arranged at the axial end faces of each battery cell accommodating cavity, and corresponding clamping grooves can be arranged on the second shell.

[0051] In some more specific embodiments, at least one cavity 102 can be arranged through the at least one full dimension of the battery pack shell.

[0052] For example, as shown in Figure 2 , a plurality of cavities 102 are arranged in the length direction of the battery pack shell, and each cavity 102 is arranged through the full dimension in the width direction of the battery pack shell.

[0053] For another example, the cavity can also be arranged through the dimension in the length direction of the battery pack shell, and for another example, the cavity can also be arranged through the dimension in the height direction of the battery pack shell. Such through arrangement is considered to be more convenient for the manufacturing and processing of the cavity.

[0054] On the contrary, in other embodiments, the cavity can also be arranged discontinuously or not through in a certain direction. For example, in the length direction of the battery pack shell, a cavity with an extension dimension much smaller than the battery pack shell is arranged, or a plurality of cavities independent of each other are arranged.

[0055] As shown in Figure 2 and Figure 6 In some embodiments, in some more specific embodiments, at least one cavity 102 can extend along the axial direction of the battery cell accommodating cavity 101, and the cavity 102 is arranged below the battery cell accommodating cavity 101.

[0056] Of course, in other embodiments, the relative position of the cavity and the battery cell accommodating cavity can also be changed as needed, for example, the cavity can also be arranged above the battery cell accommodating cavity, or arranged on both sides of the battery cell accommodating cavity in the axial direction, or arranged on both sides of the battery cell accommodating cavity in the radial direction.

[0057] In some embodiments, considering that the corner of the battery pack is more likely to be impacted, at least one cavity 102 is arranged at the corner P of the battery pack shell, as shown in Figure 7 .

[0058] In some more specific embodiments, in order to further improve the damping effect, a buffer element can be arranged in at least one of the cavities. In particular, a buffer element can be arranged in the cavity at the corner.

[0059] In some more specific embodiments, the cushioning element can comprise an elastic filler, such as a rubber block, an air bag or the like, filled in the cavity.

[0060] In some more specific embodiments, the cushioning element can also comprise a spring leaf 200 built in the cushioning cavity. The spring leaf 200 can be ring-shaped.

[0061] The battery pack shell has simple structure, is convenient to realize, has the effect of protecting the battery cell and reducing deformation, and can be conveniently applied to various battery packs.

[0062] In another embodiment, the utility model also provides a battery pack, and since the utility model does not specially improve other structures of the battery pack, the detailed structure of the battery pack will not be described in detail herein.

[0063] In an embodiment, the utility model also provides a power tool with the battery pack, which has high use safety and good use experience. Since the utility model does not specially improve other structures of the power tool, the detailed structure of the power tool will not be described in detail herein.

[0064] In some specific embodiments, the power tool can be an electric hammer, an electric drill, an angle grinder, a circular saw or other power tools using the battery pack.

[0065] It should be noted that the prior art part in the protection scope of the utility model is not limited to the embodiments given in the utility model document, and all prior art not contradictory to the scheme of the utility model, including but not limited to prior patent documents, prior published publications, prior public use and the like, can be included in the protection scope of the utility model.

[0066] In addition, the combination mode of various technical features in the case is not limited to the combination mode recorded in the claims of the case or the combination mode recorded in the specific embodiments, and all technical features recorded in the case can be freely combined or combined in any mode, unless contradictory to each other.

[0067] It should be noted that the above listed embodiments are only specific embodiments of the utility model. Apparently, the utility model is not limited to the above embodiments, and similar changes or modifications made from the disclosed content of the utility model or easily thought of by those skilled in the art should belong to the protection scope of the utility model.

Claims

1. A battery pack casing having an internal cell accommodating cavity (101), characterized in that, At least one wall structure (103) is provided between the outer wall of the cell housing cavity and the battery pack shell, and the wall structure, the battery pack shell and the outer wall of the cell housing cavity form a plurality of closed cavities (102).

2. The battery pack casing as described in claim 1, characterized in that, It includes a first housing (110) and a second housing (120) that are separately arranged and connected together. The cell accommodating cavity is disposed on the second housing. The first housing and the second housing are connected together and together with the wall structure and the outer wall of the cell accommodating cavity to form the closed cavity.

3. The battery pack casing as described in claim 2, characterized in that, The Young's modulus of the second shell is less than that of the first shell.

4. The battery pack casing as described in claim 3, characterized in that, The difference between the Young's modulus of the second shell and the Young's modulus of the first shell is 600-3500 MPa.

5. The battery pack casing as described in claim 2, characterized in that, The inner side of the first housing is provided with a rib (111) protruding from the surface, and the second housing is provided with a slot (122), the end of the rib being inserted into the slot.

6. The battery pack casing as described in claim 5, characterized in that, The rib is located at the axial end face of the cell housing cavity.

7. The battery pack casing as described in claim 1, characterized in that, At least one of the cavities is disposed through at least one full-size direction of the battery pack housing.

8. The battery pack casing as described in claim 1, characterized in that, At least one cavity is provided at a corner (P) of the battery pack housing.

9. The battery pack casing as described in claim 1, characterized in that, At least one cavity extends along the axial direction of the cell housing and is located below the cell housing.

10. The battery pack casing as described in claim 1, characterized in that, At least one of the cavities is provided with a buffer element.

11. The battery pack casing as described in claim 10, characterized in that, The buffer element is disposed at least in the cavity at the corner of the battery pack casing.

12. The battery pack casing as described in claim 10, characterized in that, The cushioning element includes elastic padding and / or spring sheets (200).

13. A battery pack, characterized in that, It includes a battery pack housing (100) as described in any one of claims 1-12, wherein a battery cell is disposed within a cell accommodating cavity of the battery pack housing.

14. A power tool, characterized in that, It is equipped with the battery pack as described in claim 13.

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