Battery pack shell and electric tool battery pack

Abstract

The battery pack shell comprises a base, a top cover and a front end cover, an upper limiting protrusion and a lower limiting protrusion extending inwards are arranged at the edge of a top opening, and a left limiting groove and a right limiting groove are formed in the inner walls of the two sides of an installation inner cavity and located below the upper limiting protrusion and the lower limiting protrusion. The edge of the top cover is provided with an up-and-down limiting part extending outwards, the bottom of the up-and-down limiting part is provided with a left-and-right limiting part, the top cover can be inserted into the mounting inner cavity along the front opening, the left-and-right limiting part and the left-and-right limiting groove are matched and inserted, and the up-and-down limiting part is located between the up-and-down limiting protrusion and the left-and-right limiting groove; the front end cover covers the top opening, and the front edge of the top cover abuts against the upper edge of the front end cover, so that the situation that the top cover and the base are loosened due to vibration in the use process of the electric tool is effectively prevented, and the structural connection strength of the battery pack shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack shell and an electric tool battery pack. Background Art

[0002] Battery packs are widely used in various electric equipment. The battery pack contains multiple cells, which are fixed together by cell holders. Lithium-ion handheld power tools have made great progress in recent years. One of the important reasons is the advancement of lithium-ion technology and the reduction of costs. Power tools need to be equipped with detachable battery packs. Some collisions, squeezing and vibrations are inevitable during the use of power tools. Therefore, it is particularly important to ensure the reliability of the entire battery pack. An important factor that determines the reliability of the battery pack is the strength and reliability of the battery pack shell structure.

[0003] Existing battery pack shells are all provided with a base and a top cover, which are buckled together and fixedly connected by bolts, screws and other connectors. During the use of the power tool, some collisions, extrusions and vibrations are inevitable. Since there is no stable limiting and fixing structure between the base and the top cover, the connection between the upper and lower shells of the existing battery pack shell is unstable.

[0004] Therefore, there is an urgent need for a battery pack housing and a power tool battery pack to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a battery pack shell and an electric tool battery pack, in order to better solve the technical problems of improving the vibration resistance of the battery pack shell and preventing loosening.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A battery pack housing, comprising:

[0008] A base, wherein the interior of the base is an installation cavity, a top opening is provided on the top surface of the base, a front opening is provided on the front surface of the base, upper and lower limit protrusions extending inward are provided at the edge of the top opening, and left and right limit grooves are provided on the inner walls on both sides of the installation cavity, and the left and right limit grooves are located below the upper and lower limit protrusions;

[0009] A top cover, wherein the edge of the top cover is an upper and lower limit portion extending outward, the bottom of the upper and lower limit portions is a left and right limit portion, the left and right limit portions are located on both sides of the top cover, the top cover can be inserted into the installation cavity along the front opening, and the top cover cover is arranged at the top opening, the left and right limit portions are matched and plugged with the left and right limit grooves, and the upper and lower limit portions are located between the upper and lower limit protrusions and the left and right limit grooves;

[0010] The front end cover is fixedly connected to the front end of the base, and the front end cover is arranged at the top opening, and the front edge of the top cover abuts against the upper edge of the front end cover.

[0011] In the above description, as a further solution, a first threaded hole is opened at the four corners of the top opening, and a second threaded hole is opened at the four corners of the front end cover. When the front end cover is fixedly connected to the front end of the base, the first threaded hole and the second threaded hole are matched and aligned, and the first threaded hole and the second threaded hole are threadedly connected by bolts.

[0012] In the above description, as a further solution, a positioning protrusion is provided at the bottom of the rear end of the top cover, a positioning plug-in hole is opened in the middle of the positioning protrusion, and a positioning column matching the positioning plug-in hole is provided on the rear end surface of the installation cavity. When the top cover is inserted into the installation cavity, the positioning protrusion is plugged and positioned with the positioning protrusion through the positioning plug-in hole.

[0013] An electric tool battery pack comprises a battery cell clamp, a plurality of battery cells and the battery pack shell mentioned above, wherein the battery cell clamp comprises a left bracket and a right bracket, a plurality of mounting holes are provided inside the left bracket and the right bracket, a plurality of battery cells are respectively plugged into the plurality of mounting holes, the battery cell clamp is embedded in the mounting inner cavity, and a front end cover is arranged on the front end surface of the battery cell clamp.

[0014] In the above description, as a further solution, a circuit board is provided on the top of the battery clamp, and a connection terminal for connecting an external power tool is provided on the top surface of the circuit board, and the connection terminal can extend to the top surface of the top cover.

[0015] In the above description, as a further solution, a connecting groove matching the connecting terminal is opened on the top surface of the top cover, and the connecting groove is located above the connecting terminal. The external power tool can be plugged into the connecting groove to be electrically connected to the connecting terminal.

[0016] In the above description, as a further solution, a locking piece is provided on the top of the front end cover, and the locking piece is movably connected to the front end cover through an elastic reset piece, one end of the locking piece is an inverted buckle that protrudes upward, and the top surface of the top cover is provided with a through hole matching the inverted buckle, the inverted buckle at one end of the locking piece can extend into the through hole for insertion, and the top end of the inverted buckle can extend to the top surface of the top cover.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] A battery pack shell of the present application has a top cover that can be inserted into the installation cavity along the front opening, and a structure in which the left and right limiting portions and positioning protrusions on the edge of the top cover are limitedly abutted against the upper and lower limiting protrusions and left and right limiting grooves of the top opening of the base, thereby realizing a stable connection structure between the top cover and the base without the need for screws, effectively preventing the top cover and the base from loosening due to vibration during the use of the power tool, and improving the structural connection strength of the battery pack shell itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a power tool battery pack according to the utility model;

[0020] Figure 2 This is a schematic structural diagram of a top cover in a battery pack housing according to the utility model;

[0021] Figure 3 It is a structural schematic diagram of a base in a battery pack housing according to the utility model;

[0022] Figure 4 It is a schematic diagram of the structure of a battery pack housing according to the utility model after the top cover and the base are plugged and assembled;

[0023] Figure 5 for Figure 4 A is a schematic diagram of the partially enlarged structure of the middle part;

[0024] Figure 6 It is a schematic cross-sectional view of a battery pack housing according to the present invention after the top cover and the base are plugged together;

[0025] Figure 7 It is a schematic diagram of the structural decomposition of a power tool battery pack according to the utility model;

[0026] In the figure: 1-base, 11-installation cavity, 12-top opening, 13-upper and lower limit protrusions, 14-left and right limit grooves, 15-positioning column, 16-front opening, 17-first threaded hole, 2-top cover, 21-through hole, 22-upper and lower limit parts, 23-left and right limit parts, 24-positioning protrusions, 25-connecting through grooves, 26-positioning plug-in holes, 3-front end cover, 31-second threaded hole, 4-battery cell fixture, 41-left bracket, 42-right bracket, 43-mounting hole, 5-locking piece, 51-undercut, 6-circuit board, 61-connecting terminal. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0028] See also Figure 1-7 A battery pack shell specifically implemented therein includes a base 1, a top cover 2 and a front cover 3, the interior of the base 1 is an installation cavity 11, a top opening 12 is provided on the top surface of the base 1, a front opening 16 is provided on the front surface of the base 1, and upper and lower limit protrusions 13 extending inward are provided at the edge of the top opening 12, left and right limit grooves 14 are provided on the inner walls on both sides of the installation cavity 11, and the left and right limit grooves 14 are located below the upper and lower limit protrusions 13, and the edge of the top cover 2 is an upper and lower limit portion 22 extending outward, and the upper and lower limit portions 22 are provided on the upper and lower limit portions 22. The bottom of the positioning portion 22 is the left and right limiting portions 23, which are located on both sides of the top cover 2. The top cover 2 can be inserted into the installation inner cavity 11 along the front opening 16, and the top cover 2 is set at the top opening 12. The left and right limiting portions 23 are matched and inserted with the left and right limiting grooves 14. The upper and lower limiting portions 22 are located between the upper and lower limiting protrusions 13 and the left and right limiting grooves 14. The front end cover 3 is fixedly connected to the front end of the base 1, and the front end cover 3 is set at the top opening 12. The front edge of the top cover 2 is abutted against the upper edge of the front end cover 3. The four corners of the top opening 12 are provided with first threaded holes 17, and the four corners of the front end cover 3 are provided with second threaded holes 31. When the front end cover 3 is fixedly connected to the front end of the base 1, the first threaded hole 17 is matched and aligned with the second threaded hole 31, and the first threaded hole 17 and the second threaded hole 31 are threadedly connected by bolts.

[0029] The top cover 2 can be inserted into the installation cavity 11 along the front opening 16, and the left and right limiting parts 23 and positioning protrusions 24 on the edge of the top cover 2 are limited and abutted with the upper and lower limiting protrusions 13 and left and right limiting grooves 14 of the top opening 12 of the base 1, so that a stable connection structure can be formed between the top cover 2 and the base 1 without screws, effectively preventing the top cover 2 and the base 1 from loosening due to vibration during the use of the power tool, thereby improving the structural connection strength of the battery pack shell itself.

[0030] A positioning protrusion 24 is provided at the bottom of the rear end of the top cover 2, a positioning plug hole 26 is provided in the middle of the positioning protrusion 24, and a positioning column 15 matching the positioning plug hole 26 is provided on the rear end surface of the installation inner cavity 11. When the top cover 2 is inserted into the installation inner cavity 11, the positioning protrusion 24 is plugged and positioned with the positioning protrusion 24 through the positioning plug hole 26. The plugging and positioning with the positioning plug hole 26 and the positioning protrusion 24 improves the connection accuracy between the top cover 2 and the base 1 on the one hand, and on the other hand, when the battery pack is paired and installed with an external power tool. The top cover 2 plays the main role of bearing the weight of the battery pack, and can transfer the weight of the battery pack to between the positioning column 15 and the positioning plug hole 26, so that the force distribution of the top cover 2 is more reasonable.

[0031] A power tool battery pack includes a battery cell clamp 4, a plurality of battery cells and the above-mentioned battery pack shell, wherein the battery cell clamp 4 includes a left bracket 41 and a right bracket 42, and a plurality of mounting holes 43 are provided inside the left bracket 41 and the right bracket 42, and a plurality of battery cells are respectively inserted into the plurality of mounting holes 43, and the battery cell clamp 4 is embedded in the interior of the mounting cavity 11, and the front end cover 3 is provided on the front end surface of the battery cell clamp 4.

[0032] A circuit board 6 is provided on the top of the battery clamp 4. A connection terminal 61 for connecting an external power tool is provided on the top surface of the circuit board 6. The connection terminal 61 can extend to the top surface of the top cover 2. A connection slot 25 matching the connection terminal 61 is provided on the top surface of the top cover 2. The connection slot 25 is located above the connection terminal 61. The external power tool can be plugged into the connection slot 25 to be electrically connected to the connection terminal 61. A locking member 5 is provided on the top of the front cover 3. The locking member 5 is movably connected to the front cover 3 through an elastic reset member (not shown). One end of the locking member 5 is an upside-down buckle 51 protruding upward. A through hole 21 matching the upside-down buckle 51 is provided on the top surface of the top cover 2. The upside-down buckle 51 at one end of the locking member 5 can extend to the inside of the through hole 21 for plugging. The top end of the upside-down buckle 51 can extend to the top surface of the top cover 2.

[0033] An assembly process of a power tool battery pack: inserting the two ends of the battery cell into the mounting holes 43 in the left bracket 41 and the right bracket 42 respectively, firmly holding the battery cell between the left bracket 41 and the right bracket 42, fixing the circuit board 6 equipped with the connection terminal 61 on the top surface of the battery cell fixture 4, setting the top cover 2 above the circuit board 6 so that the connection slot 25 is located above the connection terminal 61, and then inserting the top cover 2 into the installation cavity 11 along the front opening 16, and the top cover 2 is set on the top opening 1 2, the left and right limit parts 23 are matched and plugged with the left and right limit grooves 14, and the upper and lower limit parts 22 are abutted between the upper and lower limit protrusions 13 and the left and right limit grooves 14, so that the battery cell clamp 4 can be installed in the installation cavity 11 formed by the top cover 2 and the base 1, and finally, when the front end cover 3 is fixedly connected to the front end of the base 1, the first threaded hole 17 and the second threaded hole 31 are matched and aligned, and the first threaded hole 17 and the second threaded hole 31 are screwed and fixed by bolts to complete the assembly of the power tool battery pack.

[0034] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery pack housing, characterized in that: include: A base, wherein the interior of the base is an installation cavity, a top opening is provided on the top surface of the base, a front opening is provided on the front surface of the base, upper and lower limit protrusions extending inward are provided at the edge of the top opening, and left and right limit grooves are provided on the inner walls on both sides of the installation cavity, and the left and right limit grooves are located below the upper and lower limit protrusions; A top cover, wherein the edge of the top cover is an upper and lower limit portion extending outward, the bottom of the upper and lower limit portions is a left and right limit portion, the left and right limit portions are located on both sides of the top cover, the top cover can be inserted into the installation cavity along the front opening, and the top cover cover is arranged at the top opening, the left and right limit portions are matched and plugged with the left and right limit grooves, and the upper and lower limit portions are located between the upper and lower limit protrusions and the left and right limit grooves; The front end cover is fixedly connected to the front end of the base, and the front end cover is arranged at the top opening, and the front edge of the top cover abuts against the upper edge of the front end cover.

2. A battery pack housing according to claim 1, characterized in that: The four corners of the top opening are provided with first threaded holes, and the four corners of the front end cover are provided with second threaded holes. When the front end cover is fixedly connected to the front end of the base, the first threaded hole and the second threaded hole are matched and aligned, and the first threaded hole and the second threaded hole are threadedly connected by bolts.

3. A battery pack housing and a power tool battery pack according to claim 1, characterized in that: A positioning protrusion is provided at the bottom of the rear end of the top cover, a positioning plug hole is opened in the middle of the positioning protrusion, and a positioning column matching the positioning plug hole is provided on the rear end surface of the installation cavity. When the top cover is inserted into the installation cavity, the positioning protrusion is plugged and positioned with the positioning protrusion through the positioning plug hole.

4. A power tool battery pack, characterized in that: It includes a battery cell clamp, several battery cells and a battery pack shell as described in any one of claims 1 to 3, wherein the battery cell clamp includes a left bracket and a right bracket, and several mounting holes are opened inside the left bracket and the right bracket, and several battery cells are respectively inserted into the several mounting holes, and the battery cell clamp is embedded in the inside of the mounting cavity, and the front end cover is arranged on the front end surface of the battery cell clamp.

5. The electric tool battery pack according to claim 4, characterized in that: A circuit board is disposed on the top of the battery clamp, and a connection terminal for connecting an external electric tool is disposed on the top surface of the circuit board, and the connection terminal can extend to the top surface of the top cover.

6. The electric tool battery pack according to claim 5, characterized in that: The top surface of the top cover is provided with a connecting slot matching the connecting terminal, the connecting slot is located above the connecting terminal, and an external electric tool can be plugged into the connecting slot to be electrically connected to the connecting terminal.

7. The electric tool battery pack according to claim 4, characterized in that: A locking piece is provided on the top of the front end cover, and the locking piece is movably connected to the front end cover through an elastic reset piece. One end of the locking piece is an inverted buckle that protrudes upward, and a through hole matching the inverted buckle is provided on the top surface of the top cover. The inverted buckle at one end of the locking piece can extend into the through hole for insertion, and the top end of the inverted buckle can extend to the top surface of the top cover.

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