阅读说明：本技术 电池包 (Battery pack ) 是由 吴小力 董志军 于 2021-06-04 设计创作，主要内容包括：本发明公开了一种电池包,包括：壳体；电芯组,包括多个电芯,所述电芯组位于在所述壳体形成的容纳空间内；电池包接口,形成于所述壳体的上侧,用于使所述电池包沿第一方向可拆卸连接至电工工具；所述壳体远离上侧的一侧为下侧；多个连接端子,所述电池包至少通过所述连接端子输出所述电芯组的电能；所述连接端子包括：第一端子片和与所述第一端子片抵接的第二端子片,其中,所述第一端子片和所述第二端子片抵接以形成能夹持所述电动工具的工具端子的第一夹持区域和能夹持同一所述工具端子的第二夹持区域；所述第一夹持区域和所述第二夹持区域在所述第一方向上错开设置。本发明提供了一种抗振性好,连接可靠的适用于电动工具的电池包以及电池包的连接端子。(The invention discloses a battery pack, comprising: a housing; the battery core group comprises a plurality of battery cores, and the battery core group is positioned in the accommodating space formed in the shell; a battery pack interface formed at an upper side of the housing for detachably connecting the battery pack to an electrical tool in a first direction; the side of the shell far away from the upper side is the lower side; the battery pack outputs the electric energy of the electric core group at least through the connecting terminals; the connection terminal includes: a first terminal piece and a second terminal piece abutting against the first terminal piece, wherein the first terminal piece and the second terminal piece abut against each other to form a first clamping area capable of clamping a tool terminal of the electric tool and a second clamping area capable of clamping the same tool terminal; the first clamping area and the second clamping area are arranged in a staggered mode in the first direction. The invention provides a battery pack which has good vibration resistance and reliable connection and is suitable for an electric tool and a connection terminal of the battery pack.)

1. A battery pack, comprising:

a housing;

the battery core group comprises a plurality of battery cores, and the battery core group is positioned in the accommodating space formed in the shell;

a battery pack interface formed at an upper side of the housing for detachably connecting the battery pack to an electrical tool in a first direction; defining one side of the shell far away from the upper side as a lower side;

the battery pack outputs the electric energy of the electric core group at least through the connecting terminals;

the connection terminal includes:

a first terminal piece and a second terminal piece abutted against the first terminal piece,

wherein the content of the first and second substances,

the first terminal piece and the second terminal piece are abutted to form a first clamping area capable of clamping a tool terminal of the electric tool and a second clamping area capable of clamping the same tool terminal;

the first clamping area and the second clamping area are arranged in a staggered mode in the first direction.

2. The battery pack according to claim 1, wherein:

the first terminal piece includes a first outer connecting member and a first inner connecting member;

the first outer connecting piece extends out of a first outer supporting leg along a first direction;

the first inner connecting piece extends out of a first inner supporting leg along a first direction;

the second terminal piece comprises a second outer connecting piece and a second inner connecting piece;

the second outer connecting piece extends out of a second outer supporting leg along the first direction;

the second inner connecting piece extends out of a second inner supporting leg along the first direction;

wherein the first outer leg and the second outer leg abut to form the first clamping area capable of clamping the tool connecting terminal;

the first inner supporting leg and the second inner supporting leg are abutted to form a second clamping area for clamping the tool connecting terminal;

when the battery pack is mounted to the electric tool, the first clamping region contacts the tool terminal first, and then the second clamping region contacts the tool terminal.

3. The battery pack according to claim 2, wherein:

the first outer connecting piece, the first inner connecting piece, the second outer connecting piece is arranged at intervals in a second direction perpendicular to the first direction.

4. The battery pack according to claim 2, wherein:

the first terminal piece includes a first connecting member connecting the first outer connecting member and the first inner connecting member;

the second terminal piece comprises a second connecting piece, and the second connecting piece is connected with the second outer connecting piece and the second inner connecting piece.

5. The battery pack according to claim 1, wherein:

the battery pack further includes:

a circuit board for fixing the connection terminal;

the first terminal piece further includes: at least one first supporting leg extending downward from the first outer connecting member to be connected with the circuit board to fix the first terminal piece;

the second terminal piece further includes: and the second supporting legs extend downwards from the second outer connecting piece and are connected with the circuit board to fix the second terminal pieces.

6. The battery pack according to claim 5, wherein:

the length of the first supporting leg in the first direction is smaller than the length of the first outer connecting piece;

the length of the second supporting leg in the first direction is smaller than that of the second outer connecting piece.

7. The battery pack according to claim 4, wherein:

the first connector is disposed away from the first outer leg and the first inner leg in the first direction.

8. The battery pack according to claim 4, wherein:

the first connecting piece is close to the upper side of the shell.

9. The battery pack according to claim 4, wherein:

the second connector is proximate to the underside of the housing.

10. The battery pack according to claim 1, wherein:

the first terminal piece is integrally formed;

the second terminal piece is integrally formed.

11. A combination battery pack and power tool, comprising:

the electric tool comprises a tool main body, and a tool interface and a tool matching part which are arranged on the tool main body; and

the battery pack is provided with a battery pack interface and a battery pack combining part, the battery pack interface is configured to be matched with the tool interface to supply power to the electric tool, and the battery pack combining part can be detachably connected with the tool matching part;

the battery pack further includes:

a housing;

the battery core group comprises a plurality of battery cores, and the battery core group is positioned in the accommodating space formed in the shell;

a battery pack interface formed at an upper side of the housing for detachably connecting the battery pack to an electrical tool in a first direction; the side of the shell far away from the upper side is the lower side;

the battery pack outputs the electric energy of the electric core group at least through the connecting terminals;

the connection terminal includes:

a first terminal piece and a second terminal piece abutted against the first terminal piece,

wherein the content of the first and second substances,

the first terminal piece and the second terminal piece are abutted to form a first clamping area capable of clamping a tool terminal of the electric tool and a second clamping area capable of clamping the same tool terminal;

the first clamping area and the second clamping area are arranged in a staggered mode in the first direction.

Technical Field

The invention relates to a battery pack, in particular to a battery pack suitable for an electric tool.

Background

The battery pack is widely used in an electric tool to supply power to the electric tool. Be provided with the terminal seat pole piece on the electric tool, be provided with connecting terminal on the battery package, when battery package and electric tool are connected, peg graft mutually through terminal seat pole piece and battery package connecting terminal to switch on power.

In the working process of the battery pack matched with an electric tool, vibration exists all the time, the vibration frequency and the vibration period are different, and due to the restriction of relevant factors such as modeling, a platform and the insertion and extraction force, a power terminal which ensures proper insertion and extraction force, wear resistance and uninterrupted contact needs to be designed in a limited space.

Due to the vibration of the electric tool in the using process, the contact failure risk exists between the connecting terminal of the conventional battery pack and the terminal base pole piece of the electric tool at the contact part, and the problem that the battery pack cannot supply power to the electric tool or the power supply is interrupted can be caused.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a battery pack which has good vibration resistance and is reliably connected and is suitable for an electric tool and a connecting terminal of the battery pack.

In order to achieve the above object, the present invention adopts the following technical solutions: a battery pack, comprising: a housing; the electric core group comprises a plurality of electric cores and is positioned in the accommodating space formed in the shell; a battery pack interface formed at an upper side of the housing for detachably connecting the battery pack to an electrical tool in a first direction; defining one side of the shell far away from the upper side as a lower side; the battery pack outputs the electric energy of the battery core group at least through the connecting terminals; the connection terminal includes: the tool terminal comprises a first terminal piece and a second terminal piece abutted with the first terminal piece, wherein the first terminal piece and the second terminal piece are abutted to form a first clamping area capable of clamping a tool terminal of an electric tool and a second clamping area capable of clamping the same tool terminal; the first clamping area and the second clamping area are arranged in a staggered mode in the first direction.

Further, the first terminal piece includes a first outer connecting member and a first inner connecting member; the first outer connecting piece extends out of the first outer supporting leg along the first direction; the first inner connecting piece extends out of the first inner supporting leg along the first direction; the second terminal piece comprises a second outer connecting piece and a second inner connecting piece; the second outer connecting piece extends out of a second outer supporting leg along the first direction; the second inner connecting piece extends out of the second inner supporting leg along the first direction; the first outer support leg and the second outer support leg are abutted to form a first clamping area capable of clamping the tool connecting terminal; the first inner support leg and the second inner support leg are abutted to form a second clamping area for clamping the tool connecting terminal; when the battery pack is mounted to the electric tool, the first clamping area is firstly contacted with the tool terminal, and then the second clamping area is contacted with the tool terminal.

Furthermore, the first outer connecting piece, the first inner connecting piece and the second inner connecting piece are arranged at intervals in a second direction perpendicular to the first direction.

Further, the first terminal piece includes a first connecting member connecting the first outer connecting member and the first inner connecting member; the second terminal piece comprises a second connecting piece, and the second connecting piece is connected with the second outer connecting piece and the second inner connecting piece.

Further, the battery pack further includes: a circuit board for fixing the connection terminal; the first terminal piece further includes: at least one first supporting leg extending downward from the first outer connecting member to be connected with the circuit board to fix the first terminal piece; the second terminal piece further includes: and the second supporting legs extend downwards from the second outer connecting piece and are connected with the circuit board to fix the second terminal piece.

Further, the length of the first supporting leg in the first direction is smaller than the length of the first outer connecting member; the length of the second supporting foot in the first direction is smaller than that of the second outer connecting piece.

Further, the first connector is disposed away from the first outer leg and the first inner leg in the first direction.

Further, the first connecting member is close to the upper side of the housing.

Further, the second connector is proximate to the underside of the housing.

Further, the first terminal piece is integrally formed; the second terminal piece is integrally formed.

A combination battery pack and power tool, comprising: the electric tool comprises a tool main body, a tool interface and a tool matching part, wherein the tool interface and the tool matching part are arranged on the tool main body; the battery pack is provided with a battery pack interface and a battery pack combining part, the battery pack interface is set to be matched with the tool interface to supply power for the electric tool, and the battery pack combining part can be detachably connected with the tool matching part; the battery package still includes: a housing; the electric core group comprises a plurality of electric cores and is positioned in the accommodating space formed in the shell; a battery pack interface formed at an upper side of the housing for detachably connecting the battery pack to an electrical tool in a first direction; the side of the shell far away from the upper side is the lower side; the battery pack outputs the electric energy of the battery core group at least through the connecting terminals; the connection terminal includes: the tool terminal comprises a first terminal piece and a second terminal piece abutted with the first terminal piece, wherein the first terminal piece and the second terminal piece are abutted to form a first clamping area capable of clamping a tool terminal of an electric tool and a second clamping area capable of clamping the same tool terminal; the first clamping area and the second clamping area are arranged in a staggered mode in the first direction.

The invention has the advantages of improving the vibration resistance of the battery pack and improving the connection reliability of the battery pack and the electric tool.

Drawings

FIG. 1 is a schematic view of a battery pack and power tool;

fig. 2 is a structural view of a battery pack as one of the embodiments;

FIG. 3 is a schematic view of the internal structure of the battery pack shown in FIG. 1 with the battery pack housing removed;

FIG. 4 is a schematic view of the structure of the power tool terminal block and the tool terminal;

fig. 5 is a structural view of one orientation of a connection terminal as one embodiment;

fig. 6 is a structural view of another orientation of the connection terminal as one embodiment;

fig. 7 is a structural view of one orientation of a first terminal piece of the connection terminal shown in fig. 5;

fig. 8 is a structural view of a second terminal plate of the connection terminal shown in fig. 5;

fig. 9 is a structural view of another orientation of the first terminal piece of the connection terminal shown in fig. 5;

fig. 10 is a force analysis diagram of the first terminal piece shown in fig. 7 when the tool terminal is displaced;

fig. 11 is a force analysis diagram of the second terminal piece shown in fig. 8 when the tool terminal is displaced;

fig. 12 is a structural view of a connection terminal of another embodiment;

fig. 13 is a structural view of a second terminal piece of the connection terminal shown in fig. 12.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

Fig. 1 shows a power tool 100 and a battery pack 200 that can fit the power tool 100 and power the power tool 100, in this embodiment the power tool 100 is a drill, but it should be understood that the present application is not limited to the disclosed embodiments and can be applied to other types of power tools 100 including, but not limited to, hammers, sanders, angle grinders, wrenches, and electric saws.

The electric power tool 100 includes: the tool body 10, and the tool interface 30 and the tool fitting portion 20 provided on the tool body 10, and the battery pack 200 is provided with a battery pack interface 45 and a battery pack coupling portion 44. The battery pack interface 45 is used to adapt the tool interface 30 to power the power tool 100. The battery pack coupling portion 44 is detachably connectable to the tool engaging portion 20 so that the battery pack 200 can supply power to the power tool 100.

In the following description, the front, rear, left, and right directions are described using the directions indicated by the arrows in fig. 2.

Referring to fig. 1 to 2, the tool body 10 includes: a housing 11, a function member 12, a motor 13, a grip portion 15, and an operation switch 14.

The functional member 12 is used for realizing the function of the electric tool 100, and the functional member 12 is driven by the motor 13. The function member 12 is different for different power tools 100. For example, for angle grinders, the functional element 12 is a blade that performs a grinding or cutting function. The functional part 12 is connected to the electric motor 13, in particular the functional part 12 is connected to the electric motor 13 via an output shaft and a transmission. The motor 13 includes a rotor, a stator, and a motor shaft, and is connected to the output shaft and the motor shaft through a transmission mechanism, and transmits a driving force of the motor to the output shaft.

The housing 11 defines a head housing space that accommodates the motor 13 and the transmission mechanism. The tool body 10 further includes a grip portion 15, the grip portion 15 may be formed as a separate part or by the housing 11, and the grip portion 15 may be gripped by a user to operate the power tool 100.

An operating switch 14 is further disposed on the holding portion 15, the operating switch 14 is used for starting or stopping the operation of the motor 13, and the operating switch 14 can also be used for realizing the speed regulation of the motor 13. The operating switch 14 may be, but is not limited to, a trigger, a knob, a slide mechanism, and the like. The electric power tool 100 is provided with a tool fitting portion 20 and a tool interface 30 at a lower end of the grip portion.

The battery pack 200 is used to supply electric power to the electric power tool 100, and as shown in fig. 2 and 3, the battery pack 200 includes: battery pack case 41, circuit board 42 and electric core assembly 43.

The battery pack case 41 includes an upper case 411 and a lower case 412. The upper case 411 and the lower case 412 are assembled to form an accommodating space to fix and accommodate the electric core assembly 43. A battery pack coupling portion 44 is formed on one upper surface of the battery pack case 41, and the battery pack coupling portion 44 is capable of mating with the tool fitting portion 20, so that the battery pack 200 is detachably attached to the bottom of the electric tool 100 in the first direction, and in some embodiments, the battery pack coupling portion 44 is provided with a pair of sliding portions having an inverted L-shaped cross section. Accordingly, in order to attach the battery pack 200 to the tool body 10, the sliding portion can slide along the tool fitting portion 20 at the bottom of the handle to be mounted to the tool body 10 through the tool fitting portion 20, and in some embodiments, the tool fitting portion 20 is provided as a pair of rails. More specifically, when the user slides the battery pack 200 toward the front of the tool main body 10, the battery pack 200 may be connected thereto.

The battery pack 200 further includes a battery pack interface 45, and in some embodiments, the battery pack interface 45 is formed on an upper side of the battery pack housing 41 for detachably connecting the battery pack 200 to the power tool 100 in the first direction. The battery pack interface 45 includes a power positive interface 451, a power negative interface 452, and a power communication interface 453. The battery pack 200 provides electric energy for the electric tool 100 through the power supply positive interface 421 and the power supply negative interface 452; the battery pack 200 communicates with the power tool 100 through the power communication interface 453. In one particular embodiment, the housing is provided with 6 battery pack interfaces 45, it being understood that the battery pack housing 41 may be provided with more or less battery pack interfaces 45 depending on the electrical characteristics of the battery pack 200.

The cell assembly 43 includes a plurality of cells 431, which are connected in series, in parallel, or in combination of series and parallel to form the cell assembly 43. In some embodiments, the battery cells 431 are in a flat bag structure, a plurality of battery cells 431 are stacked up and down, and the battery cells 431 may also be bent into an arc shape. In other embodiments, the battery cell 431 has a cylindrical structure. It is to be understood that the present application is not limited to the disclosed embodiments, and the structure of the cell is not limited thereto.

The circuit board 42 is located between the upper shell 411 and the electric core assembly 43, and is connected with the electric core assembly 43. The circuit board 42 includes a power management module (not shown) and a plurality of connection terminals 46. The power management module is configured to perform power management on the battery pack 200 to implement charging and discharging management of the battery pack 200. The connection terminal 46 is located in the battery pack interface 45 and is configured to cooperate with the tool terminal 17 of the power tool 100 to output the electric power of the electric core module 43 to the power tool 100. The circuit board 42 is also used to fix the connection terminal 46, the connection terminal 46 includes a power terminal 461 and a battery pack communication terminal 462, and the power terminal 461 includes a battery pack negative terminal 4611 and a battery pack positive terminal 4612. The battery pack negative terminal 4611 and the battery pack positive terminal 4612 are used to supply power to the power tool 100 connected to the battery pack interface 45. The battery pack communication terminal 462 is located in the power supply communication interface 453 to communicate with the electric power tool 100 that is accessed to the battery pack interface 45. In the present embodiment, the 6 connection terminals 46 are, in order from left to right from the arrangement portion of the connection terminals 46: a first battery pack negative terminal, a second battery pack negative terminal, a first battery pack communication terminal, a second battery pack communication terminal, a first battery pack positive terminal, a second battery pack positive terminal. Wherein the first and second battery pack negative terminals are connected in parallel and connected to one electrode of the electric core assembly 43, and the first and second battery pack positive terminals are connected in parallel and connected to the other electrode of the electric core assembly 43. Thus, when discharging the battery pack 200, a discharge current will flow through the battery pack positive terminal and the battery pack negative terminal; while when the battery pack 200 is charging, a charging current will flow through the battery pack negative terminal 4611 and the battery pack positive terminal 4612. In the present embodiment, the terminal structures of the power supply terminal 461 and the battery pack communication terminal 462 are different.

Referring to fig. 4, the power tool 100 further includes a terminal block 16 and a tool terminal 17, the terminal block 16 is used for fixing the tool terminal 17 at a predetermined position, and when the battery pack 200 is connected to the power tool 100, the tool terminal 17 can be inserted into the connection terminal 46 of the battery pack 200 to electrically connect the power tool 100 and the battery pack 200. Specifically, the terminal block 16 and the tool terminal 17 are located in the tool interface 30 at the bottom end of the grip portion 15.

Referring to fig. 5 to 8, as a specific structure of the connection terminal 46 of one embodiment, the connection terminal 46 clamps the tool terminals 17 by elastic force from both sides in the left-right direction, respectively. That is, the connection terminal 46 has a clamping area. In addition, the tool terminal 17 of the electric power tool 100 is guided by the battery pack interface 45 of the battery pack 200 during the sliding process and inserted into the connection terminal 46, so that the tool terminal 17 of the electric power tool 100 and the battery pack connection terminal 46 are electrically connected.

Here, the connection terminal 46 includes a first terminal piece 463 and a second terminal piece 464 abutting against the first terminal piece 463, and the first terminal piece 463 and the second terminal piece 464 are provided independently of each other. The first terminal piece 463 and the second terminal piece 464 abut to form a clamping area configured to clamp the tool terminal 17, i.e., the tool terminal 17 can be inserted between the first terminal piece 463 and the second terminal piece 464. In some embodiments, the first and second terminal pieces 463 and 464 abut to form first and second clamping regions 465 and 466 that can clamp the tool terminal 17, and the first and second clamping regions 465 and 466 are offset in the first direction. So that both gripping portions can grip the tool terminal 17 at the same time. Here, the first and second clamping regions 465 and 466 are maintained in an electrically conductive state. In some embodiments, the first clamping area 465 and the second clamping area 466 can clamp other terminals capable of being matched with the connection terminal 46, such as a terminal of a charger, and the invention is not limited thereto. In some embodiments, the first and second terminal pieces 463 and 464 are each integrally formed of a conductive metal.

Specifically, the first terminal piece 463 includes a first outer connecting member 4631 and a first inner connecting member 4632, and the second terminal piece 464 includes a second outer connecting member 4641 and a second inner connecting member 4642. Wherein the first outer connecting member 4631, the first inner connecting member 4632, the second inner connecting member 4642, and the second outer connecting member 4641 are spaced apart in a second direction perpendicular to the first direction.

First outer connecting member 4631 extends in a first direction from first outer leg 4633, and first inner connecting member 4632 extends in a first direction from first inner leg 4634. The second outer connecting member 4641 extends in a first direction out of a second outer leg 4643 and the second inner connecting member 4642 extends in a first direction out of a second inner leg 4644. The first outer leg 4633 and the second outer leg 4643 abut to form the first clamping area 465 capable of clamping the tool connection terminal 46; the first inner leg 4634 and the second inner leg 4644 abut to form a second clamping area 466 for clamping the tool connection terminal 46. When the battery pack 200 is mounted to the electric power tool 100, that is, when the battery pack 200 is slid along the bottom of the handle of the tool body 10 for attachment, the tool terminal 17 is inserted into the connection terminal 46, and then the first clamping region 465 is brought into contact with the tool terminal 17, and then the second clamping region 466 is brought into contact with the tool terminal 17.

The first outer leg 4633 is bent inwardly of the connection terminal 46 from one end of the first outer connector 4631 to extend in a first direction, the second outer leg 4643 is bent inwardly of the connection terminal 46 from one end of the second outer connector 4641 to extend in the first direction to contact corresponding portions of the pair of first outer legs 4633 to form a first contact point 467, and the first outer leg 4633 and the second outer leg 4643 are bent outwardly of the connection terminal 46 at the first contact point 467 to form a first gap 4651 at an end of the first clamping region 465 to guide the tool terminal 17 into the first clamping region 465. Likewise, the first inner leg 4634 is bent inwardly of the connection terminal 46 from one end of the first inner connection member 4632 to extend in the first direction, the second inner leg 4644 is bent inwardly of the connection terminal 46 from one end of the second inner connection member 4642 to extend in the first direction to contact corresponding portions of the pair of first inner legs 4634 to form a second contact point 468, and the first inner leg 4634 and the second inner leg 4644 are bent outwardly of the connection terminal 46 at the second contact point to form a second gap 4652 at an end of the second clamping region 466 to guide the tool terminal 17 into the second clamping region 466. In some embodiments, the length of second outer leg 4643 is greater than the length of first inner leg 4634, first outer leg 4633 and second outer leg 4643 are the same length, first inner leg 4634 and second inner leg 4644 are the same length, such that first outer leg 4633 and first inner leg 4634 can abut to form first clamping region 465, second outer leg 4643 and second inner leg 4644 can abut to form second clamping region 466, and first clamping region 465 and second clamping region 466 are disposed one behind the other in the first direction. In some embodiments, the distance between the first contact point 467 and the second contact point 468 is less than or equal to 7mm, and further, the distance between the first contact point 467 and the second contact point 468 is less than or equal to 5mm, so that the connection terminal 46 can be adapted to the shorter tool terminal 17 to enable the smaller tool terminal 17 to simultaneously contact the first contact point 467 and the second contact point 467, thereby improving the vibration resistance of the battery pack 200.

In some embodiments, the first clamping area 465 is divided into two equal longitudinal widths by a slit disposed in a first direction from one end of the first clamping area 465. The second clamping region 466 is also divided into two equal longitudinal widths, and the slit is provided in the first direction from one end of the second clamping region 466.

In some embodiments, first outer leg 4633 and second outer leg 4643 are also each provided with a boss at first contact point 467 to increase the gripping force of first gripping region 465 on tool terminal 17. Likewise, the first inner leg 4634 and the second inner leg 4644 may also be respectively bumped at the second contact point to increase the gripping force of the second gripping region 466 against the tool terminal 17.

According to the structure of the connection terminal 46 thus constructed, when the battery pack 200 is mounted to the electric power tool 100, the tool terminal 17 enters the battery pack interface 45, and when the battery pack 200 continues to slide, the tool terminal 17 enters the first gap 4651 formed at the end of the first clamping region 465 and then enters the first clamping region 465, the battery pack 200 continues to move in the first direction, and the tool terminal 17 enters the second gap 4652 correspondingly formed at the end of the second clamping region 466 and enters the second clamping region 466. Therefore, as the battery pack 200 is inserted into the electric power tool 100 in the first direction, the connection terminals 46 will be press-fitted between the clamping areas, and then the tool terminals 17 and the connection terminals 46 are electrically connected by the press-contact of the first terminal pieces 463 and the second terminal pieces 464 with each other, which effectively prevents heat accumulation and chattering from occurring at the contact points of the connection terminals 46 and the tool terminals 17.

The first terminal piece 463 further includes a first supporting leg 4635, the first supporting leg 4635 extending downward from the first outer connecting member 4631, connected to the circuit board 42, for fixing the first terminal piece 463. In some embodiments, the length of the first support leg 4635 in the first direction is smaller than the length of the first outer connection member 4631, and thus the contact area of the first terminal piece 463 and the circuit board 42 is small to achieve the elastic connection of the first terminal piece 463 and the circuit board 42. In some embodiments, the first terminal piece 463 further includes a first auxiliary support portion 4636, the first auxiliary support portion 4636 includes an extension arm 4638 and a support arm 4637, the support arm 4637 is coupled to the circuit board 42 and spaced apart from the first support leg 4635, the support arm 4637 is coupled to the first outer connecting member 4631 via the extension arm 4638, and the first auxiliary support portion 4636 can make the coupling of the first terminal piece 463 and the circuit board 42 more stable. In some embodiments, the first terminal piece 463 is provided with a plurality of first supporting legs 4635 in the first direction.

In this way, as shown with reference to fig. 9, when the tool terminal 17 is displaced by vibration of the electric power tool 100 to apply a force to the first terminal piece 463, the first terminal piece 463 can float around the intersection point P1 of the first auxiliary support 4636 and the first outer connection member 4631, thereby improving the vibration resistance of the battery pack 200, and maintaining the contact area of the connection terminal 46 and the tool terminal 17, suppressing an increase in contact resistance, and suppressing heat generated in connection electrons due to the increase in contact resistance.

In addition, the second terminal piece 464 further includes a second support leg 4645, the second support leg 4645 extends downward from the second outer connecting member 4641 and is connected to the circuit board 42 for fixing the second terminal piece 464. In some embodiments, the length of the second support leg 4645 in the first direction is less than the length of the second outer connecting member 4641 to enable a resilient connection of the second terminal piece 464 and the circuit board 42. The second terminal piece 464 further includes a second auxiliary support portion 4646, and in some embodiments, the second auxiliary support portion 4646 extends from the second outer connecting member 4641 in the second direction to make the connection of the second terminal piece 464 and the circuit board 42 more stable. It is understood that the second auxiliary support 4646 may also have a similar structure to the first auxiliary support 4636, and while the stability of the second terminal piece 464 is increased, the second terminal piece 464 may float around the intersection of the second auxiliary support 4646 and the second outer connecting member 4641, thereby improving the vibration resistance of the battery pack 200.

Further, the first terminal piece 463 further includes a first connecting member 4637, the first connecting member 4637 being disposed between the first outer connecting member 4631 and the first inner connecting member 4632 to connect the first outer leg 4633 and the first inner leg 4634, so that the first inner leg 4634 can be interlocked with the first outer leg 4633, that is, the first inner leg 4634 can move along with the first outer leg 4633. In some embodiments, the first connection 4637 is near the upper side of the housing, i.e., the first connection 4637 connects the upper portions of the first outer and inner connections 4631, 4632; in other embodiments, first connection 4637 is disposed distal to first outer leg 4633 and first inner leg 4634 in a first direction, i.e., first connection 4637 connects the rear of first outer connection 4631 and first inner connection 4632.

Similarly, the second terminal piece 464 further includes a second connecting member 4647, and the second connecting member 4647 is disposed between the second outer connecting member 4641 and the second inner connecting member 4642 to connect the second outer connecting member 4641 and the second inner connecting member 4642, thereby connecting the second outer leg 4643 and the first inner leg 4634, so that the second outer leg 4643 can be linked with the second inner leg 4644, that is, the first inner leg 4634 can move along with the second outer leg 4643. In some embodiments, the second connector 4647 is proximate to the underside of the battery pack housing 41, i.e., the second connector 4647 connects the lower portions of the second outer connector 4641 and the second inner connector 4642.

In this way, as shown in fig. 10 to 11, when the tool terminal 17 moves leftward, the first outer leg 4633 is moved leftward by the force applied by the tool terminal 17, and the first outer leg 4633 transmits the force to the first inner leg 4634 through the first connecting member 4637 to move the first inner leg 4634, so that the first inner leg 4634 also moves leftward along with the first outer leg 4633; at this time, the second inner leg 4644 is also moved leftward by the force applied from the tool terminal 17, and the second inner leg 4644 transmits the force to the second outer leg 4643 through the second connecting member 4647 to move the second outer leg 4643, so that the second outer leg 4643 also moves leftward following the second inner leg 4644. It will be appreciated that when the tool terminal 17 is moved to the right, the first inner leg 4634 is moved to the right by the force exerted by the tool terminal 17, and the first outer leg 4633 also follows the first inner leg 4634 to the right; at this time, the second outer leg 4643 is also moved rightward by the force applied by the tool terminal 17, and therefore the second inner leg 4644 also follows the first outer leg 4633 to move rightward.

In this way, the first terminal piece 463 and the second terminal piece 464 can move following the direction in which the tool terminal 17 moves, so that the first clamping area 465 and the second clamping area 466 are kept relatively stable, and the clamping force is maintained constant. Therefore, even if the tool terminal 17 is displaced by the vibration of the electric power tool 100, the contact failure between the connection terminal 46 and the tool terminal 17 can be prevented.

Referring to fig. 12 to 13, as a specific structure of the connection terminal 46 of another embodiment, the structure is different from that of the example connection terminal shown in fig. 5: the first connection 4637 of the first terminal piece 463 is disposed away from the first outer leg 4633 and the first inner leg 4634 in the first direction, connecting the rear portions of the first outer connection 4631 and the first inner connection 4632. And the second auxiliary supporting portion 4646 of the second terminal piece 464 extends from the second outer connecting member 4641 in the first direction.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.