CN211957772U

CN211957772U - Battery pack

Info

Publication number: CN211957772U
Application number: CN202020252329.8U
Authority: CN
Inventors: 王良均; 樊秀斌; 范永斌; 邓春英
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-11-17
Anticipated expiration: 2030-03-04

Abstract

The utility model provides a battery pack, battery pack can be along the slip direction installation with dismantle in external equipment, battery pack includes the electrode slice, external equipment includes the terminal, the electrode slice can be followed the both sides centre gripping of terminal the terminal forms the electricity and connects, a serial communication port, the electrode slice includes the kink, it has two parts of relative setting to go up the kink, it includes the basal portion and follows to go up the kink the clamping part that the basal portion extended, the clamping part has and is used for the centre gripping the electrical contact of terminal, the extending direction of electrical contact with the slip direction quadrature. By adopting the technical scheme, the extending direction of the electric contact part of the electrode plate is orthogonal to the relative sliding direction of the battery and the external equipment, so that the contact area between the electrode plate and the terminal is increased.

Description

Battery pack

Technical Field

The utility model relates to a battery package for electric tool.

Background

Electric power tools, such as electric drills, electric circular saws, and the like, generally include a battery pack that is detachably mounted to a power tool main body to function as a power supply for the electric power tool. When the electric quantity of the battery pack is insufficient, the battery pack can be detached from the electric tool main body and connected to the charging device for charging. The electric tool and the charging device are provided with plate-shaped terminals, the battery pack is provided with pole pieces capable of clamping the terminals, the larger the contact area of the pole pieces and the terminals is, the larger the current carried by the pole pieces and the terminals can be, and the lower the temperature of the pole pieces and the terminals can be when the current passes through the terminals.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery package makes electrode slice and external equipment's terminal can form reliable electricity and connect to have great area of contact in limited within range.

The utility model provides a battery pack which can be installed and disassembled on an external device along a sliding direction, the battery pack comprises an electrode plate, the external device comprises a terminal, the electrode plate can clamp the terminal from two sides of the terminal to form electric connection, the battery pack is characterized in that,

the electrode slice comprises an upper bending part, the upper bending part is provided with two parts which are oppositely arranged, the upper bending part comprises a base part and a clamping part extending from the base part, the clamping part is provided with an electric contact part used for clamping the terminal, and the extending direction of the electric contact part is orthogonal to the sliding direction.

Preferably, an extending direction of the electrical contact portion coincides with an extending direction of the upper bending portion.

Preferably, one end of the clamping portion receiving the terminal along the sliding direction is formed as an insertion guide portion capable of functioning to guide the terminal when the terminal is inserted from between the two clamping portions.

Preferably, the cross section of the insertion guide portion is circular arc-shaped.

Preferably, the side of the clamping portions opposite to the side receiving the terminal in the sliding direction is formed as a pull-out guide portion which enables the terminal to be smoothly pulled out when the terminal is pulled out from between the two clamping portions.

Preferably, the upper bending portion is provided with a notch groove, and the notch groove divides the oppositely arranged clamping portion into a plurality of pairs of elastic clamping pieces.

Preferably, the clamping portion is formed by press working the upper bent portion.

Preferably, contact portions of the terminals and the electrode tabs extend in an up-down direction of the battery pack.

Preferably, the electrode plate further comprises a bottom plate portion and a lower bending portion, the lower bending portion is bent and extended from the bottom plate portion to the lower side, the upper bending portion is bent and extended from the bottom plate portion to the upper side, and the lower bending portion is used for fixedly mounting the electrode plate on a circuit board.

Preferably, the two oppositely disposed portions of the upper bending portion are parallel.

By adopting the technical scheme, the extending direction of the electric contact part of the electrode plate is orthogonal to the relative sliding direction of the battery pack and the external equipment, so that the contact area of the electrode plate and the terminal is increased.

In addition, a plurality of pairs of elastic clamping pieces can be arranged in a limited space, so that the contact area between the pole piece and the terminal is increased.

Drawings

Fig. 1 shows a structural exploded view of a battery pack according to an embodiment of the present invention.

Fig. 2 shows a perspective view of a pole piece of a battery pack according to an embodiment of the present invention.

Fig. 3 shows a side view of a pole piece of a battery pack according to an embodiment of the invention.

Fig. 4 shows a schematic diagram of a terminal inserted into a pole piece of a battery pack according to an embodiment of the invention.

Fig. 5 shows a schematic diagram of a terminal inserted into a pole piece of a battery pack according to an embodiment of the invention.

Description of the reference numerals

100 battery pack 101, lower cover 102, upper cover 103, circuit board 104 opening

1 Pole piece 11 bottom plate part 12 lower folded part 13 elastic clamping piece pair 131 upper folded part 132 clamping part 132a insertion guide 132b extraction guide 132c electric contact part 133 base part 134 edge part 135 gap groove

2 terminal.

Detailed Description

In order to more clearly illustrate the above objects, features and advantages of the present invention, the detailed description of the embodiments of the present invention is provided in this section in conjunction with the accompanying drawings. The present invention can be embodied in other different forms than the embodiments described in this section, and those skilled in the art can make various modifications, changes and substitutions without departing from the spirit of the present invention, so that the present invention is not limited to the specific embodiments disclosed in this section. The protection scope of the present invention shall be subject to the claims.

The battery pack 100 may be horizontally, vertically, or obliquely mounted to an external device, which may be a power tool or a charging device. Unless otherwise specified, in the following description, the front-rear direction X refers to the front-rear direction of the battery pack 100, the left-right direction Y refers to the left-right direction of the battery pack 100, and the up-down direction Z refers to the up-down direction of the battery pack 100.

As shown in fig. 1, the present invention provides a battery pack 100, wherein the battery pack 100 can be detachably mounted on an external device. The battery pack 100 may be mounted to an external device by sliding in the front-rear direction X, and in the following description, the direction in which the battery pack 100 slides when the battery pack 100 is mounted to the external device is referred to as "rear", and the direction in which the battery pack 100 slides when the battery pack 100 is detached from the external device is referred to as "front". The left side when facing the front side is "left", and the right side is "right". When the battery pack 100 is mounted on an external device, the side where the battery pack 100 is viewed from the external device is referred to as "up", and the side where the external device is viewed from the battery pack 100 is referred to as "down".

The external device is provided with a battery pack mounting portion for mounting the battery pack 100, and the battery pack mounting portion is provided with rectangular flat plate-like terminals extending in the front-rear direction X and the up-down direction Z.

The battery pack 100 comprises a lower cover 101, a pole piece 1, an upper cover 102 and a circuit board 103, wherein the pole piece 1 and the circuit board 103 are mounted on the lower cover 101 and protrude upwards from the surface of the lower cover 101, and the pole piece 1 is mounted in a containing space formed by the upper cover 102 and the lower cover 101. The upper cover 102 is connected to the lower cover 101, the upper cover 102 is provided with an opening 104, the pole piece 1 is disposed inside the opening 104 in a state where the upper cover 102 is mounted on the lower cover 101, and at least a part of the pole piece 1 can be observed through the opening 104. When the battery pack 100 is mounted to an external device, the battery pack slides in the front-rear direction X, and the terminal of the external device enters the opening 104, and the pole piece 1 in the opening 104 and the terminal of the external device are brought into contact to form an electrical connection. As shown in fig. 4 and 5, the pole piece 1 is electrically connected to the terminal 2 by sandwiching the terminal 2 between the pole piece 1 and the terminal 2 from both left and right sides, and the terminal 2 is slidable in the front-rear direction X.

As shown in fig. 2 to 5, the pole piece 1 includes a bottom plate portion 11, a lower bent portion 12 and an upper bent portion 131, and the bottom plate portion 11, the lower bent portion 12 and the upper bent portion 131 are integrally formed, that is, the pole piece 1 may be manufactured by cutting, bending and stamping from a single metal plate.

As shown in fig. 2, the bottom plate 11 may be formed in a rectangular plate shape, and the longitudinal direction thereof is along the front-rear direction X. The lower bending portion 12 extends downward from the bottom plate portion 11, the lower bending portion 12 may be located at two sides and a middle position of the front-back direction X of the bottom plate portion 11, the lower bending portion 12 may be used to fixedly mount the pole piece 1 on the circuit board, and the lower bending portion 12 may be connected to the circuit board 103.

The upper bent portion 131 is bent and extended upward from the bottom plate portion 11, and the upper bent portion 131 has two portions oppositely disposed in pair. Specifically, the pair of upper bent portions 131 are located on both sides in the left-right direction Y of the bottom plate portion 11 and are disposed oppositely, and the pair of upper bent portions 131 are bilaterally symmetrical.

The upper bent portion 131 includes a clamping portion 132, a base portion 133 and an edge portion 134, the base portion 133 extends upward from both left and right ends of the bottom plate portion 11, and the clamping portion 132 and the edge portion 134 are continuously connected to an upper end of the base portion 133.

The upper folded portion 131 is provided with a cut-out groove 135, and the cut-out groove 135 is formed as an elongated groove extending downward from an upper end portion of the upper folded portion 131. A portion below the bottom of the notch groove 135 is the base portion 133.

The oppositely disposed clamping portions 132 separated by the cutaway groove 135 are referred to as an elastic clamping piece pair 13. A plurality of pairs of elastic clamping pieces 13 may be arranged in the length direction X, so that the contact area between the pole piece 1 and the terminal 2 may be increased by increasing the number of pairs of elastic clamping pieces. The larger the contact area of the pole piece 1 and the terminal 2, the greater the current that the pole piece 1 can carry and the lower the temperature of the pole piece.

It is to be understood that the adjacent notch grooves 135 may have different intervals to form the pair of elastic nipping and holding pieces 13 having different lengths in the front-rear direction X. The cutaway grooves 135 may have different heights in the up-down direction Z so that the lengths of the arms of the pair of elastic clamping pieces 13 are different. The longer the length of the notched groove 135, the longer the arm length of the pair of elastic holding pieces 13, and the smaller the insertion force required for the terminal 2 to be inserted into the pair of elastic holding pieces 13; the shorter the length of the notched groove 135, the shorter the arm length of the pair of elastic clamping pieces 13, and the greater the insertion force required for the terminal 2 to be inserted into the pair of elastic clamping pieces 13.

In the present embodiment, the clamping portion 132 extends from the upper end of the upper bent portion 131 toward the bottom plate portion 11, and the contact portion (the electrical contact portion 132c) between the terminal 2 and the pole piece 1 extends in the vertical direction Z. By increasing the height of the clamping portion 132 in the up-down direction Z, the contact area of the pole piece 1 and the terminal 2 can be increased. The edge portions 134 are located around the clamping portion 132, such as the front and rear sides of the clamping portion 132. The clamping portions 132 protrude from the base portion 133 and the edge portion 134 in the left-right direction Y, and the clamping portions 132 are used to clamp the terminal 2 from both sides of the terminal 2. Both front and rear sides of the clamping portion 132 may be formed with edge portions 134 such that the clamping portion 132 is located at a middle position in the front-rear direction X of the upper bent portion 131. The clamping portions 132 of the pair of upper bent portions 131 protrude in opposite directions to be close to each other, for example, the clamping portion 132 at the left side protrudes to the right side, and the clamping portion 132 at the right side protrudes to the left side, so that the clamping portions 132 of the pair of upper bent portions 131 are close to each other, but they do not contact each other.

The upper bent portion 131 is formed in a curved shape having higher strength than a flat plate by forming the clamping portion 132 by punching. The clamping portion 132 is located at the middle position in the front-rear direction X of the pair of elastic clamping pieces 13, so that the clamping portion 132 has high strength and is not easily deformed. It is understood that if the area of the punching is large when the upper bent portion 131 is punched, the clamping portion 132 itself extends to the edge, and the flat plate-like edge portion 134 may not be formed around the clamping portion 132.

The clamping portion 132 includes an insertion guide portion 132a, a withdrawal guide portion 132b, and an electrical contact portion 132 c. The cross section of the clamping portion 132 may be arc-shaped, and the insertion guide portion 132a and the extraction guide portion 132b may be arc-shaped. The electric contact portion 132c is a closest portion where the pair of elastic holding pieces 13 are close to each other, and the electric contact portion 132c is for contacting both side surfaces of the terminal 2. The insertion guide 132a is located at the rear side of the electrical contact 132c, and the extraction guide 132b is located at the front side of the electrical contact 132 c. The insertion guide portion 132a, the electrical contact portion 132c, and the withdrawal guide portion 132b are continuously and smoothly connected.

The insertion guide portion 132a is located on the side of the holding portion 132 that receives the terminal 2 in the sliding direction (front-rear direction X), and the insertion guide portion 132a extends rearward and outward, specifically, the insertion guide portion 132a on the left extends rearward and leftward, and the insertion guide portion 132a on the right extends rearward and rightward. In receiving the terminal 2, the edge of the terminal 2 contacts the inner side surface of the insertion guide portion 132a, and the pair of elastic nipping pieces 13 are bent outward, so that the terminal 2 is easily inserted into the pair of elastic nipping pieces 13. In addition, the insertion guide portion 132a can prevent a corner portion of an edge of the terminal 2 (i.e., a cut surface where a metal plate is cut) from partially contacting the clamping portion 132.

The pull-out guide portion 132b is located on the opposite side of the clamping portion 132 receiving the terminal 2 in the sliding direction (the front-rear direction X), the pull-out guide portion 132b extending to the front and to the outside, specifically, the pull-out guide portion 132b on the left extends to the front and to the left, and the pull-out guide portion 132b on the right extends to the front and to the right. The pull-out guide portion 132b can prevent a corner portion of an edge of the terminal 2 (i.e., a cut surface where a metal plate is cut) from partially contacting the grip portion 132 during the pulling-out of the terminal 2. Further, by forming the extraction guide 132b, even when the surface of the terminal 2 has irregularities due to mechanical wear or electrical wear, the terminal 2 can be easily and smoothly extracted. The insertion guide portion 132a and the extraction guide portion 132b may be symmetrical with respect to the electrical contact portion 132c in the front-rear direction X.

It will be appreciated that the pole piece 1 grips the terminal 2 by suitable elastic deformation, and that both the terminal 2 and the pole piece 1 are susceptible to excessive wear if the pole piece 1 is pressed very tightly against the terminal 2. If the force with which pole piece 1 presses terminal 2 is small, the electrical connection formed by terminal 2 and pole piece 1 is not reliable enough. Even if the pole piece 1 can hold the terminal 2 by proper elastic deformation, if the pole piece 1 has insufficient strength, the pole piece 1 may deform during long-term use, resulting in unreliable electrical connection between the terminal 2 and the pole piece 1.

The extending direction of the upper bent portion 131 coincides with the generatrix direction of the curved surface of the clamping portion 132 (extending direction of the electrical contact portion 132c), for example, the upper bent portion 131 extends in the vertical direction Z, and the generatrix of the circular arc curved surface of the clamping portion 132 also extends in the vertical direction Z. Such a structure can provide the upper bent portion 131 with high strength and is not easily deformed excessively.

The extending direction of the electrical contact portion 132c is orthogonal to the relative sliding direction of the pole piece 1 and the terminal 2, for example, the extending direction of the upper bent portion 131 is the vertical direction Z, and the relative sliding direction of the pole piece 1 and the terminal 2 is the front-back direction X. Therefore, a plurality of pairs of elastic clamping pieces 13 are arranged in a limited space, so that the current which can be borne by the pole piece 1 is large, and the temperature of the pole piece 1 is low.

As shown in fig. 4 and 5, when the terminal 2 is inserted into the pair of elastic clamping pieces 13, the base portion 133 is elastically deformed so that the pair of elastic clamping pieces 13 clamp the terminal 2, and the upper bent portion 131 is bent outward. The pair of elastic holding pieces 13 is elastically deformed by being opened in the left-right direction Y, and the elastic force of the pair of elastic holding pieces 13 against the terminal 2 causes the pair of elastic holding pieces 13 to hold the terminal 2, whereby the battery pack 100 is mounted on an external device. When the terminal 2 is pulled out of the pair of elastic holding pieces 13, the pair of elastic holding pieces 13 can be restored to its original shape.

As shown in fig. 2 and 3, the two portions of the pair of upper bent portions 131 are parallel, and of course, substantially parallel, and the two upper bent portions 131 may be slightly inclined inward or outward, for example, may be inclined by 1 to 10 degrees. The upper bent part 131 is slightly bent outward due to elastic deformation when the terminal 2 is inserted between two portions of the upper bent part 131, but it is also possible to keep the two portions of the upper bent part 131 substantially parallel.

Preferably, when the terminal 2 is inserted into the pair of elastic clamping pieces 13, the two parts of the upper bent part 131 are parallel to each other and also parallel to the terminal 2, so that the contact area of the terminal 2 and the pole piece 1 is large.

The terminal 2 and the electrical contact portion 132c may form a line contact in the up-down direction Z, but the contact area of the terminal 2 and the electrical contact portion 132c may increase as the electrical contact portion 132c is worn in use.

In the above embodiment, each pair of elastic clamping pieces 13 is provided with one pair of clamping portions 132, but the present invention is not limited thereto, and each pair of elastic clamping pieces 13 may also be provided with a plurality of pairs of clamping portions 132, for example, a plurality of pairs of clamping portions 132 may be arranged in the front-rear direction X, and a plurality of pairs of clamping portions 132 may increase the contact area of the terminal 2 and the pole piece 1.

Claims

1. A battery pack, the battery pack (100) being attachable to and detachable from an external device along a sliding direction, the battery pack (100) including electrode tabs (1), the external device including terminals (2), the electrode tabs (1) being capable of sandwiching the terminals (2) from both sides of the terminals (2) to form an electrical connection, characterized in that,

the electrode sheet (1) comprises an upper bent portion (131), the upper bent portion (131) comprises two oppositely arranged parts, the upper bent portion (131) comprises a base portion (133) and a clamping portion (132) extending from the base portion (133), the clamping portion (132) is provided with an electric contact portion (132c) used for clamping the terminal (2), and the extending direction of the electric contact portion (132c) is orthogonal to the sliding direction.

2. The battery pack according to claim 1, wherein the electrical contact portion (132c) has an extending direction that coincides with the extending direction of the upper bent portion (131).

3. The battery pack according to claim 1, wherein one end of the clamping portion (132) that receives the terminal (2) along the sliding direction is formed as an insertion guide portion (132a), and the insertion guide portion (132a) can function to guide the terminal (2) when the terminal is inserted from between the two clamping portions (132).

4. The battery pack according to claim 3, wherein the insertion guide portion (132a) has a circular arc-shaped cross section.

5. The battery pack according to claim 1, wherein the side of the clamping portions (132) opposite to the side receiving the terminal (2) in the sliding direction is formed as a pull-out guide portion (132b), and when the terminal (2) is pulled out from between the two clamping portions (132), the pull-out guide portion (132b) enables the terminal (2) to be smoothly pulled out.

6. The battery pack according to claim 1, wherein the upper bent portion (131) is provided with a notched groove (135), and the notched groove (135) divides the oppositely disposed clamping portion (132) into a plurality of pairs of elastic clamping pieces (13).

7. The battery pack according to claim 1, wherein the clamping portion (132) is formed by press working the upper bent portion (131).

8. The battery pack according to claim 1, wherein the contact portions of the terminals (2) and the electrode tabs (1) extend in the up-down direction (Z) of the battery pack (100).

9. The battery pack according to claim 1, wherein the electrode tab (1) further comprises a bottom plate portion (11) and a lower bent portion (12), the lower bent portion (12) is bent and extended downward from the bottom plate portion (11), the upper bent portion (131) is bent and extended upward from the bottom plate portion (11), and the lower bent portion (12) is used for fixedly mounting the electrode tab (1) to a circuit board.

10. The battery pack according to claim 1, wherein the two portions of the upper bent portion (131) that are oppositely disposed are parallel.