Electric tool battery pack with internal protection structure

Abstract

The utility model relates to an electric tool battery pack with an internal protection structure in the technical field of battery packs, which comprises a shell, a clamp and a circuit board, the clamp comprises a left support and a right support, the upper edge of the left support and the upper edge of the right support are respectively provided with a shielding part protruding towards one side, and when the left support and the right support are mutually connected, the shielding parts protrude towards one side. The shielding parts of the left support and the right support can cover the battery cell, and the circuit board is fixedly connected to the top end faces of the shielding parts, so that on one hand, the surface of the battery cell is protected from colliding with welding metal spines at the bottom of the circuit board, and on the other hand, a larger mounting contact area can be obtained between the circuit board and the left support as well as between the circuit board and the right support; and the connection stability between the circuit board and the left bracket and the right bracket is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to an electric tool battery pack with an internal protection structure. Background Art

[0002] Power tools need to be equipped with a detachable battery pack. There are multiple lithium batteries inside the battery pack of the power tool. During assembly, all lithium batteries need to be connected and fixed first, and then installed into the battery pack shell.

[0003] According to the existing Chinese utility model patent with the announcement number CN215989079U, a battery pack for electric tools is recorded. In the battery pack of this structure, a connecting seat is added to the circuit board, one end of the spring is directly pressed against the connecting seat on the circuit board, so that the connecting seat and the circuit board are detachably connected, and then one end of the spring is directly pressed against the connecting seat on the circuit board, and the connecting seat plays the role of supporting the spring, which makes the structure simple and does not occupy the internal space of the shell, and the structure is simple.

[0004] However, the circuit board under this structure is directly fixedly connected to the top surface of the bracket, while the middle part of the battery cell is exposed outside the bracket. At the same time, when the circuit and its electronic components are welded at the bottom of the circuit board, welding metal spikes are inevitable at the welding point, causing the welding metal spikes at the bottom of the circuit board to puncture the middle part of the battery cell, posing certain safety hazards.

[0005] Therefore, there is an urgent need for an electric tool battery pack with an internal protection structure to solve the above problems. Utility Model Content

[0006] The utility model aims to provide an electric tool battery pack with an internal protection structure, in order to better solve the technical problem that the welding metal spikes at the bottom of the circuit board puncture the middle of the battery cell due to the lack of a protection structure for the battery cell between the circuit board and the bracket (i.e., the clamp).

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] An electric tool battery pack with an internal protective structure includes a shell, a clamp and a circuit board. The clamp includes a left bracket and a right bracket. The middle parts of the left bracket and the right bracket are each provided with a mounting hole for placing a battery cell. The battery cell is arranged inside the shell through the clamp. The circuit board is arranged on the top of the clamp. The upper edges of the left bracket and the right bracket are each provided with a shielding portion protruding to one side. When the left bracket and the right bracket are connected to each other, the shielding portions of the left bracket and the right bracket can cover the top of the battery cell, and the circuit board is fixedly connected to the top end surface of the shielding portion.

[0009] In the above description, as a further solution, the shielding portion has a wavy structure, and the bottom of the shielding portion is an arc structure matching the mounting hole.

[0010] In the above description, as a further solution, connecting columns are provided on the inner sides of the left bracket and the right bracket. The connecting columns are structures that protrude inward, and the left bracket and the right bracket are fixedly connected by the connecting columns.

[0011] In the above description, as a further solution, a plurality of metal connecting plates are provided on the outer sides of the left bracket and the right bracket, and the two ends of the metal connecting plates are fixedly connected to the ends of the battery cells respectively, and the metal connecting plates are used to form a series structure of the two battery cells.

[0012] In the above description, as a further solution, one end of the metal connecting piece is provided with a pin protruding upward, and the pin is used to be electrically connected to the circuit board.

[0013] In the above description, as a further solution, a plurality of slots are provided on both sides of the circuit board, and the pins at one end of the metal connecting piece can extend to both sides of the circuit board, and the pins are plugged into the corresponding slots.

[0014] In the above description, as a further solution, the shell includes a top cover and a bottom shell, the interior of the bottom shell is an installation cavity for placing the clamp, the top cover is fixedly connected to the top surface of the bottom shell, and the top cover covers the top of the clamp and the circuit board.

[0015] In the above description, as a further solution, the top surface of the circuit board is a connecting terminal, which includes a plurality of metal springs. The connecting terminal is electrically connected to the battery cell in the fixture through the circuit board, and the connecting terminal can extend to the top surface of the top cover.

[0016] In the above description, as a further solution, a plurality of connection grooves are provided on the top surface of the top cover, the connection grooves are located above the connection terminals, and the plurality of connection grooves correspond one-to-one to a plurality of metal spring sheets.

[0017] In the above description, as a further solution, horizontally opened limit grooves are respectively provided on both sides of the top cover, a through hole is provided on the top of the top cover, the through hole is connected to the interior of the shell, and a lock is provided at the bottom of the top cover, and one end of the lock can extend through the through hole to the top surface of the top cover.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The present application discloses an electric tool battery pack with an internal protective structure, in which a shielding portion protruding to one side is provided on the upper edges of the left bracket and the right bracket. When the left bracket and the right bracket are connected to each other, the shielding portion can cover the top of the battery cell to form an isolation and protection structure between the battery cell and the circuit board. On the one hand, the surface of the battery cell is protected to avoid collision with the welding metal spikes at the bottom of the circuit board. On the other hand, the circuit board can obtain a larger installation contact area with the left bracket and the right bracket, thereby improving the connection stability between the circuit board and the left bracket and the right bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a power tool battery pack with an internal protection structure according to the utility model;

[0021] Figure 2 It is a schematic diagram of the structural decomposition of a power tool battery pack with an internal protection structure according to the utility model;

[0022] Figure 3 for Figure 2 A is a schematic diagram of the partially enlarged structure of the middle part;

[0023] Figure 4 It is a schematic diagram of the structural decomposition of a clamp in a power tool battery pack with an internal protection structure according to the utility model;

[0024] In the figure: 1-top cover, 11-limiting groove, 12-connecting groove, 13-through hole, 2-bottom shell, 21-installation cavity, 3-clamp, 31-left bracket, 32-right bracket, 33-shielding part, 34-installation hole, 35-connecting column, 4-circuit board, 41-slot, 5-lock, 6-connecting terminal, 61-metal spring, 7-metal connecting piece, 71-pin. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1-4, a power tool battery pack with an internal protection structure is specifically implemented, including a shell, a clamp 3 and a circuit board 4, the clamp 3 includes a left bracket 31 and a right bracket 32, the middle of the left bracket 31 and the right bracket 32 ​​are provided with mounting holes 34 for placing the battery cells, the battery cells are arranged inside the shell through the clamp 3, the circuit board 4 is arranged on the top of the clamp 3, the upper edges of the left bracket 31 and the right bracket 32 ​​are provided with a shielding portion 33 protruding to one side, when the left bracket 31 and the right bracket 32 ​​are connected to each other, the shielding portions 33 of the left bracket 31 and the right bracket 32 ​​can cover the top of the battery cells, and the circuit board 4 is fixedly connected to the top surface of the shielding portion 33.

[0027] like Figure 4 As shown, the shielding portion 33 is a wavy structure, and the bottom of the shielding portion 33 is an arc-shaped structure that matches the mounting hole 34. When the battery cell is inserted into the mounting hole 34 in the middle of the left bracket 31 and the right bracket 32, the middle of the battery cell and the bottom of the shielding portion 33 are in an arc-shaped structure and fit each other, further improving the support strength between the battery cell and the shielding portion 33.

[0028] like Figure 4 As shown, the inner sides of the left bracket 31 and the right bracket 32 ​​are both provided with connecting posts 35, which are structures protruding inward, and the left bracket 31 and the right bracket 32 ​​are fixedly connected by the connecting posts 35. When the left bracket 31 and the right bracket 32 ​​are installed in pairs, they are aligned with each other through the connecting posts 35, so that the two connecting posts 35 are plugged and fixed, and the battery cells are stably supported between the left bracket 31 and the right bracket 32 ​​through the connecting posts 35, thereby improving the connection stability of the battery cells between the left bracket 31 and the right bracket 32.

[0029] like Figure 2-4 As shown, a plurality of metal connecting sheets 7 are provided on the outside of the left bracket 31 and the right bracket 32, and the two ends of the metal connecting sheets 7 are fixedly connected to the ends of the battery cells respectively, and the metal connecting sheets 7 are used to form a series structure of two battery cells. After the left bracket 31 and the right bracket 32 ​​assemble a plurality of battery cells, the two ends of the plurality of metal connecting sheets 7 are welded to the ends of the battery cells to form a series structure of the plurality of battery cells.

[0030] like Figure 4As shown, one end of the metal connecting piece 7 is provided with a pin 71 protruding upward, and the pin 71 is used to be electrically connected to the circuit board 4. A plurality of slots 41 are provided on both sides of the circuit board 4, and the pin 71 at one end of the metal connecting piece 7 can extend to both sides of the circuit board 4, and the pin 71 is plugged into the corresponding slot 41. The pin 71 at one end of the metal connecting piece 7 is used to extend to both sides of the circuit board 4, and a plurality of pins 71 are matched one-to-one with a plurality of slots 41. The pin 71 is plugged into the slot 41 and then welded, which further improves the connection stability between the metal connecting piece 7 and the circuit board 4, and prevents the metal connecting piece 7 from falling off from the circuit board 4 during the use of the power tool.

[0031] like Figure 2 As shown, the housing includes a top cover 1 and a bottom shell 2. The interior of the bottom shell 2 is an installation cavity 21 for placing the clamp 3. The top cover 1 is fixedly connected to the top surface of the bottom shell 2, and the top cover 1 covers the top of the clamp 3 and the circuit board 4. The top cover 1 is provided with horizontally opened limit grooves 11 on both sides, and the top of the top cover 1 is provided with a through hole 13, which is connected to the interior of the housing. The bottom of the top cover 1 is provided with a lock 5, and one end of the lock 5 can pass through the through hole 13 and extend to the top surface of the top cover 1. When the battery pack is assembled with the power tool, the power tool can slide into the limit groove 11 horizontally along the axial direction of the limit groove 11, and the limit groove 11 plays a role in preventing the battery pack and the power tool from falling off in the vertical direction.

[0032] like Figure 2-3 As shown, the top surface of the circuit board 4 is a connection terminal 6, and the connection terminal 6 includes a plurality of metal springs 61. The connection terminal 6 is electrically connected to the battery cell in the fixture 3 through the circuit board 4, and the connection terminal 6 can extend to the top surface of the top cover 1. The top surface of the top cover 1 is provided with a plurality of connection grooves 12, and the connection grooves 12 are located above the connection terminals 6, and the plurality of connection grooves 12 correspond to the plurality of metal springs 61 one by one. After the battery pack and the electric tool are assembled, the electric tool can be inserted into the interior of the connection groove 12 along the axial direction of the limiting groove 11, so that the electric tool contacts the metal springs 61 in the connection groove 12, and the battery pack provides a power driving source for the electric tool.

[0033] An assembly process of an electric tool battery pack with an internal protection structure: a plurality of battery cells are inserted into the through holes 13 of a left bracket 31 and a right bracket 32, and the left bracket 31 and the right bracket 32 ​​are fixedly connected by a connecting column 35, and then the two ends of a metal connecting piece 7 are respectively welded to the ends of two adjacent battery cells, so that a plurality of battery cells form a series structure, and the pins 71 at one end of the metal connecting piece 7 are bent upward to the two sides of a circuit board 4, and the pins 71 are inserted into a slot 41 and then welded, and the metal connecting piece 7 is electrically connected to the circuit board 4, and finally the clamp 3 with the battery cells is installed in the bottom shell 2, and the top cover 1 covers the circuit board 4 and the clamp 3, so that a plurality of connection grooves 12 correspond one-to-one with a plurality of metal spring sheets 61, and the assembly of the battery pack is completed.

[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. An electric tool battery pack with an internal protection structure, comprising a housing, a fixture and a circuit board, the fixture comprising a left bracket and a right bracket, the middle of the left bracket and the right bracket are provided with mounting holes for placing electric cores, the electric cores are arranged inside the housing through the fixture, and the circuit board is arranged on the top of the fixture, characterized in that: The upper edges of the left bracket and the right bracket are both provided with a shielding portion protruding to one side. When the left bracket and the right bracket are connected to each other, the shielding portions of the left bracket and the right bracket can cover the top of the battery cell, and the circuit board is fixedly connected to the top surface of the shielding portion.

2. The electric tool battery pack with an internal protection structure according to claim 1, characterized in that: The shielding portion is in a wave-shaped structure, and the bottom of the shielding portion is in an arc-shaped structure matching the mounting hole.

3. The electric tool battery pack with an internal protection structure according to claim 1, characterized in that: The inner sides of the left bracket and the right bracket are both provided with connecting columns, which are structures protruding inwards, and the left bracket and the right bracket are fixedly connected by the connecting columns.

4. The electric tool battery pack with an internal protection structure according to claim 1, characterized in that: A plurality of metal connecting plates are provided on the outer sides of the left bracket and the right bracket, and the two ends of the metal connecting plates are fixedly connected to the ends of the battery cells respectively. The metal connecting plates are used to form a series structure of the two battery cells.

5. The electric tool battery pack with an internal protection structure according to claim 4, characterized in that: One end of the metal connecting piece is provided with a pin protruding upward, and the pin is used for electrically connecting with the circuit board.

6. The electric tool battery pack with an internal protection structure according to claim 5, characterized in that: A plurality of slots are arranged on both sides of the circuit board, and the pins at one end of the metal connecting piece can extend to both sides of the circuit board, and the pins are plugged into the corresponding slots.

7. The electric tool battery pack with an internal protection structure according to claim 1, characterized in that: The shell comprises a top cover and a bottom shell, the interior of the bottom shell is an installation cavity for placing the clamp, the top cover is fixedly connected to the top end surface of the bottom shell, and the top cover covers the top of the clamp and the circuit board.

8. The electric tool battery pack with an internal protection structure according to claim 7, characterized in that: The top surface of the circuit board is a connecting terminal, which includes a plurality of metal springs. The connecting terminal is electrically connected to the battery cell in the fixture through the circuit board, and the connecting terminal can extend to the top surface of the top cover.

9. The electric tool battery pack with an internal protection structure according to claim 8, characterized in that: The top surface of the top cover is provided with a plurality of connection grooves, the connection grooves are located above the connection terminals, and the plurality of connection grooves correspond to a plurality of metal spring sheets one by one.

10. The electric tool battery pack with an internal protection structure according to claim 7, characterized in that: The top cover is provided with horizontally opened limit grooves on both sides, the top of the top cover is provided with a through hole, the through hole is connected to the interior of the shell, and the bottom of the top cover is provided with a lock buckle, one end of the lock buckle can pass through the through hole and extend to the top end surface of the top cover.

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