Battery pack assembly for electric drill

Abstract

The battery pack assembly for the electric drill comprises a battery support, a plurality of battery bodies which are evenly distributed are installed in the battery support, and a protection circuit board is fixedly installed on the upper end face of the battery support. Connecting piece assemblies are mounted on the front end surface and the rear end surface of the battery bracket, and the two connecting piece assemblies are oppositely arranged front and back; the connecting piece assembly comprises a first connecting piece and second connecting pieces arranged in pairs, one end of each second connecting piece is electrically connected with an electrode of the battery body, and the other end of each second connecting piece is electrically connected with the protective circuit board; the first connecting piece is arranged on the corner of the battery bracket and is electrically connected with the protection circuit board; the protection circuit board is electrically connected with a third connecting sheet and a fourth connecting sheet; according to the utility model, the third connecting piece and the fourth connecting piece are respectively arranged on the two first connecting pieces of the battery bracket, so that the overall over-current capability and the heat dissipation area of the battery pack are increased, and the use condition of the battery pack is better.

Description

Technical Field

[0001] This utility model belongs to the field of battery pack technology, specifically relating to a battery pack assembly for electric drills. Background Technology

[0002] Battery packs are commonly used to power power tools. They are often detachably connected to the tools, offering convenience and a safe, reliable structure. Existing patent CN104103783B discloses a battery pack for power tools. This conventional battery pack uses standard battery pack connectors, with the connectors at the positive and negative terminals simply widened on one side for assembly. However, with the development of lithium-ion tools, the increased capacity of lithium batteries, and the increased power of machines, these ordinary connectors no longer meet market demands. Under continuous high current, the ordinary positive and negative terminal connectors exhibit insufficient overcurrent and heat dissipation capabilities, leading to overheating of the battery pack and frequent thermal shutdowns. In some cases, overheating can even cause the connectors to burn out or the battery pack fuse to blow. Insufficient heat dissipation and prolonged high-temperature operation negatively impact battery pack performance; furthermore, it can damage the battery cells, reducing battery lifespan. Therefore, a battery pack assembly for electric drills needs to be designed to overcome these difficulties. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing a battery pack assembly for electric drills. The invention installs a third connecting piece and a fourth connecting piece on the two first connecting pieces of the battery bracket, thereby increasing the overall current carrying capacity and heat dissipation area of ​​the battery pack, resulting in better operating conditions for the battery pack.

[0004] The objective of this invention is achieved through the following technical solution: a battery pack assembly for an electric drill, comprising a battery bracket, wherein a plurality of evenly distributed battery bodies are installed within the battery bracket, and a protective circuit board is fixedly installed on the upper end face of the battery bracket; connecting piece assemblies are installed on both the front and rear end faces of the battery bracket, and the two connecting piece assemblies are arranged opposite each other; each connecting piece assembly includes a first connecting piece and a pair of second connecting pieces, one end of the second connecting piece being electrically connected to the electrode of the battery body, and the other end of the second connecting piece being electrically connected to the protective circuit board; the first connecting piece is installed on the corner of the battery bracket and is electrically connected to the protective circuit board; a third connecting piece and a fourth connecting piece are electrically connected to the protective circuit board, the third connecting piece being electrically connected to one of the first connecting pieces, and the fourth connecting piece being electrically connected to the other first connecting piece.

[0005] Preferably, the battery bracket includes a front bracket and a rear bracket, which are detachably connected; the protection circuit board is fixedly installed on the upper surface of the battery bracket, and the battery body is installed between the front bracket and the rear bracket.

[0006] Preferably, the battery bracket has several columnar protrusions, and the protection circuit board has limiting holes that match the columnar protrusions; the columnar protrusions are installed in the limiting holes, and the outer contour of the columnar protrusions matches the outer contour of the limiting holes; the battery bracket also has strip-shaped protrusions that pass through the protection circuit board.

[0007] Preferably, the protective circuit board and the battery bracket are provided with a plurality of fasteners for fixing, the fasteners being screws; the protective circuit board is provided with a first pin, a second pin, and a third pin welded thereto; the first pin is arranged adjacent to a third connecting piece, the second pin is arranged adjacent to a fourth connecting piece; the third pins are arranged in pairs, and the third pin is arranged adjacent to the first pin.

[0008] The front and rear brackets are detachably connected for easy installation of the battery body. Both brackets are also covered by a plastic shell, which is secured with screws. This plastic shell is not shown in the accompanying drawings; it is a standard, readily available part. The use of interlocking columnar protrusions and positioning holes facilitates the placement of the protection circuit board, preventing it from shifting during use. The inclusion of a first, second, and third pin allows for easy connection of the entire battery pack to a power tool.

[0009] Preferably, the battery bracket is provided with a plurality of first mounting portions for mounting the second connecting piece, the outer contour of the first mounting portion being adapted to the outer contour of the second connecting piece; the second connecting piece is a sheet metal sheet, and when the second connecting piece is mounted on the first mounting portion, it is welded to the electrodes of the battery body; the pins of the second connecting piece are welded to the protection circuit board.

[0010] Preferably, the battery bracket is provided with a second mounting part for mounting the first connecting piece, and the outer contour of the first connecting piece is adapted to the outer contour of the second mounting part; the bent metal sheet of the first connecting piece has a slot on the end face of the battery bracket adjacent to the second mounting part, and the end of the first connecting piece is disposed in the slot.

[0011] Preferably, the first connecting piece includes two pins arranged perpendicularly to each other, and the corner of the protective circuit board is provided with several strip holes arranged perpendicularly to each other. The pins of the first connecting piece are inserted into the strip holes and soldered to the protective circuit board.

[0012] Preferably, a third connecting piece is provided on one corner of the protective circuit board and soldered thereto. The third connecting piece and the protective circuit board are both soldered to the pins of the first connecting piece. The third connecting piece also includes two pins soldered to the protective circuit board.

[0013] Preferably, a fourth connecting piece is provided on one corner of the protective circuit board and welded thereto. The fourth connecting piece and the protective circuit board are both welded to the pins of the first connecting piece. The fourth connecting piece is a fusible protective connecting piece. The fourth connecting piece includes three pins welded to the protective circuit board. One pin of the fourth connecting piece is arranged adjacent to the first connecting piece, and the other two pins on the fourth connecting piece are welded to the protective circuit board.

[0014] By setting the first mounting part, it is convenient to position the second connecting piece; when assembling the second connecting piece with the battery bracket, the second connecting piece is first placed into the corresponding first mounting part; the body of the second connecting piece is first welded to the electrode of the battery body, and then the pin of the second connecting piece is welded to the protection circuit board.

[0015] When installing the first connecting piece, first install the first connecting piece onto the second mounting part and snap the end of the first connecting piece into the slot of the battery holder. Then, solder the body of the first connecting piece to the electrode of the battery body. At the same time, place both pins of the first connecting piece into the slots of the protection circuit board. Then, install the third and fourth connecting pieces. When installing the third connecting piece, solder the pins of the third connecting piece to the protection circuit board. Then, solder both the pins of the third and first connecting pieces onto the protection circuit board. Similarly, the fourth connecting piece also needs to be soldered to the first connecting piece on the other side onto the protection circuit board.

[0016] Compared with the prior art, this utility model has the following advantages: 1. A protection circuit board is installed on the battery bracket, which facilitates the control of the working state of the battery body and improves versatility; 2. A third connecting piece is installed on one of the first connecting pieces of the protection circuit board. The third connecting piece has a large contact area, which increases the overall heat dissipation area, improves the heat dissipation effect, and extends the service life of the battery pack; 3. A fourth connecting piece is installed on the other first connecting piece of the protection circuit board. The fourth connecting piece has a fuse function, so when the overcurrent value of the battery pack is large, the fourth connecting piece automatically disconnects the circuit, automatically protects the battery body, and makes it safer and more reliable for the operator to use. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a perspective view of the present invention from another angle;

[0019] Figure 3 This is an exploded view of the present invention;

[0020] Figure 4 A 3D view to protect the circuit board;

[0021] Figure 5 This is a three-dimensional view of the first connecting piece;

[0022] Figure 6 This is a three-dimensional view of the second connecting piece;

[0023] Figure 7 This is a three-dimensional view of the third connecting piece;

[0024] Figure 8 This is a three-dimensional view of the fourth connecting piece;

[0025] The markings in the diagram are: 1. Battery bracket; 101. Front bracket; 102. Rear bracket; 2. Battery body; 3. Protection circuit board; 4. Connecting piece assembly; 41. First connecting piece; 42. Second connecting piece; 5. Third connecting piece; 6. Fourth connecting piece; 7. Columnar protrusion; 8. Limiting hole; 9. Strip protrusion; 10. Fastener; 11. First pin; 12. Second pin; 13. Third pin; 14. First mounting part; 15. Second mounting part; 16. Slot; 17. Strip hole. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0027] like Figures 1 to 8 As shown, this embodiment discloses a battery pack assembly for an electric drill, including a battery bracket 1. A plurality of evenly distributed battery bodies 2 are installed within the battery bracket 1. A protective circuit board 3 is fixedly installed on the upper surface of the battery bracket 1. Connecting piece assemblies 4 are installed on both the front and rear end faces of the battery bracket 1, with the two connecting piece assemblies 4 arranged opposite each other. Each connecting piece assembly 4 includes a first connecting piece 41 and a pair of second connecting pieces 42. One end of the second connecting piece 42 is electrically connected to the electrode of the battery body 2, and the other end of the second connecting piece 42 is electrically connected to the protective circuit board 3. The first connecting piece 41 is installed on the corner of the battery bracket 1 and is electrically connected to the protective circuit board 3. A third connecting piece 5 and a fourth connecting piece 6 are electrically connected to the protective circuit board 3. The third connecting piece 5 is electrically connected to one of the first connecting pieces 41, and the fourth connecting piece 6 is electrically connected to the other first connecting piece 41.

[0028] The battery bracket 1 includes a front bracket 101 and a rear bracket 102, which are detachably connected. The protection circuit board 3 is fixedly mounted on the upper surface of the battery bracket 1, and the battery body 2 is mounted between the front bracket 101 and the rear bracket 102. The battery bracket 1 has a plurality of columnar protrusions 7, and the protection circuit board 3 has limiting holes 8 that match the columnar protrusions 7. The columnar protrusions 7 are installed in the limiting holes 8, and the outer contour of the columnar protrusions 7 is adapted to the outer contour of the limiting holes 8. The battery bracket 1 also has strip-shaped protrusions 9, which pass through the protection circuit board 3. The protective circuit board 3 and the battery bracket 1 are provided with a plurality of fasteners 10 for fixing, the fasteners 10 being screws; the protective circuit board 3 is provided with a first pin 11, a second pin 12 and a third pin 13 welded thereto; the first pin 11 is arranged adjacent to the third connecting piece 5, the second pin 12 is arranged adjacent to the fourth connecting piece 6; the third pin 13 is arranged in pairs, and the third pin 13 is arranged adjacent to the first pin 11.

[0029] The battery bracket 1 has several first mounting portions 14 for mounting the second connecting piece 42. The outer contour of the first mounting portion 14 is adapted to the outer contour of the second connecting piece 42. The second connecting piece 42 is a sheet metal sheet. When the second connecting piece 42 is mounted on the first mounting portion 14, it is welded to the electrode of the battery body 2. The pins of the second connecting piece 42 are welded to the protection circuit board 3. The battery bracket 1 has a second mounting portion 15 for mounting the first connecting piece 41. The outer contour of the first connecting piece 41 is adapted to the outer contour of the second mounting portion 15. The bent metal sheet of the first connecting piece 41 has a slot 16 on the end face of the battery bracket 1 adjacent to the second mounting portion 15. The end of the first connecting piece 41 is disposed in the slot 16. The first connecting piece 41 includes two pins arranged perpendicularly to each other. The corner of the protection circuit board 3 has several strip holes 17 arranged perpendicularly to each other. The pins of the first connecting piece 41 are inserted into the strip holes 17 and welded to the protection circuit board 3. A third connecting piece 5 is provided on one corner of the protective circuit board 3 and is soldered thereto. The third connecting piece 5 and the protective circuit board 3 are both soldered to the pins of the first connecting piece. The third connecting piece 5 also includes two pins soldered to the protective circuit board 3. A fourth connecting piece 6 is provided on one corner of the protective circuit board 3 and is soldered thereto. The fourth connecting piece 6 and the protective circuit board 3 are both soldered to the pins of the first connecting piece 41. The fourth connecting piece 6 is a fusible protective connecting piece. The fourth connecting piece 6 includes three pins soldered to the protective circuit board 3. One pin of the fourth connecting piece 6 is adjacent to the first connecting piece 41, and the other two pins on the fourth connecting piece 6 are soldered to the protective circuit board 3.

[0030] The specific operation process of this embodiment is as follows: the battery body 2 is installed in the battery bracket 1. First, the first connecting piece 41 is snapped into the slot 16 of the battery bracket 1 and the first connecting piece 41 is installed in the second mounting part 15. Then, the body of the first connecting piece 41 is welded together with the electrode of the battery body 2. Next, the second connecting piece 42 is installed in the first mounting part 14 and the body of the second connecting piece 42 is welded together with the electrode of the battery body 2.

[0031] Then, the first pin 11, the second pin 12, and the third pin 13 are soldered onto the protection circuit board 3, and the protection circuit board 3 is placed onto the battery bracket 1. The limiting hole 8 of the protection circuit board 3 is aligned with the columnar protrusion 7 on the battery bracket 1. Then, the pins on the second connecting piece 42 are soldered together with the protection circuit board 3. Next, the third connecting piece 5 and the fourth connecting piece 4 are soldered together. First, the pins of the third connecting piece 5 are soldered to the protection circuit board 3. The pins of the first connecting piece 41 pass through the strip hole 17. Then, the pins of the first connecting piece 41 are simultaneously soldered to the third connecting piece 5 and the protection circuit board 3. Similarly, the pins of the first connecting piece 41 and the fourth connecting piece 4 are first soldered to the protection circuit board 3. Finally, the pins of the first connecting piece 41 are simultaneously soldered to the fourth connecting piece 4 and the protection circuit board 3. After the soldering is completed, the protection circuit board 3 is further fixed by the fastener 10.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A battery pack assembly for an electric drill, comprising a battery bracket (1) wherein a plurality of uniformly distributed battery bodies (2) are mounted within the battery bracket (1), characterized in that, A protective circuit board (3) is fixedly installed on the upper end face of the battery bracket (1); a connecting piece assembly (4) is installed on both the front and rear end faces of the battery bracket (1), and the two connecting piece assemblies (4) are arranged opposite each other; the connecting piece assembly (4) includes a first connecting piece (41) and a pair of second connecting pieces (42), one end of the second connecting piece (42) is electrically connected to the electrode of the battery body (2), and the other end of the second connecting piece (42) is electrically connected to the protective circuit board (3); the first connecting piece (41) is installed on the corner of the battery bracket (1), and the first connecting piece (41) is electrically connected to the protective circuit board (3); a third connecting piece (5) and a fourth connecting piece (6) are electrically connected on the protective circuit board (3), the third connecting piece (5) is electrically connected to one of the first connecting pieces (41), and the fourth connecting piece (6) is electrically connected to the other first connecting piece (41).

2. The battery pack assembly for an electric drill according to claim 1, characterized in that, The battery bracket (1) includes a front bracket (101) and a rear bracket (102), which are detachably connected; the protection circuit board (3) is fixedly installed on the upper surface of the battery bracket (1), and the battery body (2) is installed between the front bracket (101) and the rear bracket (102).

3. The battery pack assembly for an electric drill according to claim 2, characterized in that, The battery bracket (1) is provided with several columnar protrusions (7), and the protective circuit board (3) is provided with limiting holes (8) that match the columnar protrusions (7); the columnar protrusions (7) are installed in the limiting holes (8), and the outline of the columnar protrusions (7) is adapted to the outline of the limiting holes (8); the battery bracket (1) is also provided with strip protrusions (9), and the strip protrusions (9) pass through the protective circuit board (3).

4. The battery pack assembly for an electric drill according to claim 2, characterized in that, The protective circuit board (3) and the battery bracket (1) are provided with a number of fasteners (10) for fixing, and the fasteners (10) are screws; the protective circuit board (3) is provided with a first pin (11), a second pin (12) and a third pin (13) welded thereto; the first pin (11) is arranged adjacent to the third connecting piece (5), the second pin (12) is arranged adjacent to the fourth connecting piece (6); the third pin (13) is arranged in pairs, and the third pin (13) is arranged adjacent to the first pin (11).

5. The battery pack assembly for an electric drill according to claim 1, characterized in that, The battery bracket (1) is provided with a plurality of first mounting portions (14) for mounting the second connecting piece (42). The outer contour of the first mounting portion (14) is adapted to the outer contour of the second connecting piece (42). The second connecting piece (42) is a sheet metal sheet. When the second connecting piece (42) is mounted on the first mounting portion (14), it is welded to the electrode of the battery body (2). The pins of the second connecting piece (42) are welded to the protection circuit board (3).

6. The battery pack assembly for an electric drill according to claim 1, characterized in that, The battery bracket (1) is provided with a second mounting part (15) for mounting the first connecting piece (41). The outer contour of the first connecting piece (41) is adapted to the outer contour of the second mounting part (15). The bent metal sheet of the first connecting piece (41) has a slot (16) on the end face of the battery bracket (1) adjacent to the second mounting part (15). The end of the first connecting piece (41) is set in the slot (16).

7. The battery pack assembly for an electric drill according to claim 1, characterized in that, The first connecting piece (41) includes two pins arranged perpendicularly to each other. The corner of the protective circuit board (3) is provided with several strip holes (17) arranged perpendicularly to each other. The pins of the first connecting piece (41) are inserted into the strip holes (17) and soldered to the protective circuit board (3).

8. The battery pack assembly for an electric drill according to claim 7, characterized in that, The protective circuit board (3) has a third connecting piece (5) welded to one corner. The third connecting piece (5) and the protective circuit board (3) are both welded to the pins of the first connecting piece. The third connecting piece (5) also includes two pins welded to the protective circuit board (3).

9. The battery pack assembly for an electric drill according to claim 7, characterized in that, The protective circuit board (3) has a fourth connecting piece (6) welded to one corner. The fourth connecting piece (6) and the protective circuit board (3) are both welded to the pins of the first connecting piece (41). The fourth connecting piece (6) is a fusible protective connecting piece. The fourth connecting piece (6) includes three pins welded to the protective circuit board (3). One pin of the fourth connecting piece (6) is adjacent to the first connecting piece (41), and the other two pins on the fourth connecting piece (6) are welded to the protective circuit board (3).

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