CN211320185U

CN211320185U - Battery pack for electric bicycle

Info

Publication number: CN211320185U
Application number: CN202020301379.0U
Authority: CN
Inventors: 王清华; 王英喆; 杜永杰; 戴�峰
Original assignee: Bafang Electric Suzhou Co Ltd
Current assignee: Bafang Electric Suzhou Co Ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2020-08-21
Anticipated expiration: 2030-03-12

Abstract

The application discloses a battery package for electric bicycle includes: the battery module in the inferior valve, accept in the inferior valve, and with the circuit protection board that the battery module is connected, connect in inferior valve open-top's upper cover. The battery pack has a simple, compact and stable structure, and can be very conveniently assembled on the electric bicycle.

Description

Battery pack for electric bicycle

Technical Field

The present application relates to a battery pack for an electric bicycle.

Background

Most of lithium battery packs for electric power-assisted bicycles in the market at present have the defects of complex structure, difficulty in assembling and fixing with a frame and the like.

The present application is hereby presented.

Disclosure of Invention

The purpose of the application is: in view of the above problems, a battery pack for an electric bicycle is provided, which is simple, compact and stable in structure.

The technical scheme of the application is as follows:

a battery pack for an electric bicycle, comprising:

a lower shell with an opening at the top part,

a battery module housed in the lower case,

a circuit protection board contained in the lower case and connected with the battery module, and

and the upper cover is connected to the opening at the top of the lower shell.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the outer contour of the lower shell is of a long strip-shaped structure, the lower shell is provided with a first end face and a second end face which are deviated from each other in the length direction of the lower shell, the first end face is provided with a clamping table which extends outwards, and the second end face is provided with a clamping groove which is recessed inwards.

The battery module includes:

two battery supports arranged at intervals left and right, and

and the plurality of single batteries are supported between the two battery brackets.

The battery holder includes:

frame body of insulating material, and

the conducting strip is fixed with the frame body;

and the positive end and the negative end of each battery monomer are welded and fixed with the conducting strips in the two battery supports respectively.

The frame body is provided with a plurality of battery insertion holes, and two ends of each battery monomer are respectively inserted into the battery insertion holes of the two battery supports.

The frame body is of an integrated injection molding structure.

The conducting strip is used as an insert and is injected into the frame body.

The conductive sheet is provided with a process notch and a welding positioning hole, and the conductive sheet is provided with a flanging.

One end of the frame body is provided with a convex hull which protrudes outwards.

The upper cover with inferior valve vibration friction welding is fixed, the inner wall of inferior valve all is equipped with the muscle position of taking the draft angle all around.

The application has the advantages that:

1. this application system has card platform and draw-in groove respectively on the terminal surface of two opposition sides of battery package. In practical application, the clamping table and the clamping groove can be utilized to be matched with the clamping component fixed on the frame, so that the battery pack can be very conveniently fixed on the frame.

2. The battery module comprises a left battery bracket, a right battery bracket and a plurality of battery monomers supported between the two battery brackets. The battery support is an integral structure formed by a plastic support body and a metal conducting strip which are connected in an injection molding mode, and the anode or cathode terminal of the battery monomer is welded and fixed with the metal conducting strip of the battery support, so that the bolt-free fixation of the battery monomer and the battery support is realized, the assembly efficiency is high, and the stability is high.

3. The battery inserting holes with the drawing angles are formed in the frame body of the battery support, and positioning, mounting and pre-tightening of each battery monomer and the battery support are greatly facilitated.

4. The conductive sheet is provided with a process notch and a welding positioning hole. The process notch can reduce the deformation of the conducting strip caused by the stress generated during welding, so that the cold joint influence caused by the unevenness of the conducting strip is reduced. The welding positioning hole can improve the precision of the welding position.

5. The flanging structure of the conducting strip can ensure that the conducting strip is better fixed with the injection molding frame body.

6. One end of the frame body is provided with a convex hull which protrudes outwards, so that a user can easily take out the battery module from the lower shell by buckling the convex hull with a hand.

7. The inner wall of inferior valve all is equipped with the muscle position of taking the draft angle all around to in the inferior valve is put into to the battery module of being convenient for, and have the fixed action to the position of battery module.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of the overall structure of a battery pack according to an embodiment of the present application;

fig. 2 is a sectional view of a battery pack in an embodiment of the present application;

fig. 3 is an exploded view of a battery module according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a battery holder in an embodiment of the present application.

Wherein: 1-a battery module, 2-a lower shell, 3-an upper cover and 4-a circuit protection board;

101-battery bracket, 102-battery monomer, 101 a-frame body, 101 b-conducting strip, 101 aa-battery plug hole and 101 ab-convex hull;

2 a-clamping table and 2 b-clamping groove.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In the description of the present specification, the terms "connected", "mounted", "fixed", and the like are to be understood in a broad sense. For example, "connected" may be fixedly connected, detachably connected, or integrally connected; may be connected directly or indirectly through intervening media. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present application.

Fig. 1 to 4 show a specific embodiment of the battery pack of the present application, which is used for being mounted on an electric bicycle to supply working electricity to the electric bicycle.

The above battery pack includes a lower case 2, an upper cover 3, a battery module 1, and a circuit protection board 4. Wherein: the top opening of the lower shell 2, the battery module 1 and the circuit protection board 4 are contained in the inner cavity of the lower shell, and the upper cover 3 is connected to the top opening of the lower shell to seal the opening. The circuit protection board 4(PCB circuit board) is connected to the battery module 1 to monitor and protect the charge and discharge of the battery module 1.

Inferior valve 2 and upper cover 3 are the plastics material, and the two vibration friction weld is fixed to each welding department leaves the interference allowance, with the reliability of assurance welding.

In this embodiment, the outer contour of the lower case 2 is a strip-shaped structure (the overall outer contour of the battery pack is a rectangular parallelepiped structure). The lower case 2 has a first end face and a second end face that are away from each other in the longitudinal direction thereof. The first end face is provided with a clamping table 2a extending outwards. The second end surface is provided with an inward sunken clamping groove 2 b. In practical application, the clamping table 2a and the clamping groove 2b can be used for being matched with a clamping component on a vehicle frame, so that the battery pack can be fixed on the vehicle frame.

The battery module 1 includes: two battery supports 101 arranged at intervals left and right support a plurality of battery cells 102 therebetween.

The two battery holders 101 each include a frame 101a made of an insulating material and a conductive sheet 101b fixed to the frame. The positive end and the negative end of each battery cell 102 are welded and fixed with the conducting strips 101b in the battery supports 101 on the left side and the right side respectively, so that the battery cells and the battery supports are fixed without bolts, and the assembly efficiency and the stability are high.

In addition, in order to facilitate positioning, mounting and pre-tightening of each battery cell 102, in this embodiment, a plurality of battery insertion holes 101aa are formed in the frame body 101a of the battery bracket, and both ends of each battery cell 102 are respectively inserted into the battery insertion holes of the left and right battery brackets 101. The battery inserting hole is provided with a die drawing angle.

After the battery supports 101 on the left side and the right side and the battery monomers 102 in the middle are assembled, a proper amount of clearance allowance is left, so that the manufacturing error of the frame body can be absorbed, and the interference is prevented.

In this embodiment, the frame body 101a of the battery holder is an integral injection molding structure, and the conductive sheet 101b is injection molded in the frame body 101a as an insert. Namely, the frame body 101a and the conductive sheet 101b are connected by injection molding, and the two are inseparable and separable.

The conductive sheet 101b is provided with a process notch and a welding positioning hole. The process notch can reduce the deformation of the conducting strip caused by the stress generated during welding (with a battery monomer), so that the cold joint influence caused by the unevenness of the conducting strip is reduced. The welding positioning hole can improve the precision of the welding position. And the conducting strip 101b is also provided with a flanging, and the flanging structure can ensure that the conducting strip and the injection molding frame body 101a are better fixed.

In addition, in this embodiment, a convex hull 101ab protruding outward is formed at one end of the frame body 101 a. The user can very easily take out the battery module 1 from the lower case 2 by grasping the convex hulls 101ab with the hands.

The inner wall of inferior valve 2 all is equipped with the muscle position of taking the draft angle all around to in the inferior valve 2 is put into to the battery module 1 of being convenient for, and have the fixed action to the position of battery module 1.

It should be understood that the above-mentioned embodiments are only illustrative of the technical concepts and features of the present application, and the present application is not limited thereto. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A battery pack for an electric bicycle, comprising:

a lower shell (2) with an opening at the top,

a battery module (1) accommodated in the lower case,

a circuit protection board (4) accommodated in the lower case and connected with the battery module, and

and the upper cover (3) is connected to the opening at the top of the lower shell.

2. The battery pack for the electric bicycle according to claim 1, wherein the outer contour of the lower case (2) has a bar-shaped configuration, the lower case (2) has a first end surface and a second end surface that are away from each other in the length direction thereof, the first end surface is formed with a catching ledge (2a) that protrudes outward, and the second end surface is formed with a catching groove (2b) that is recessed inward.

3. The battery pack for electric bicycles, according to claim 1, wherein the battery module (1) comprises:

two battery supports (101) arranged at a left-right interval, and

a plurality of battery cells (102) supported between the two battery supports.

4. The battery pack for electric bicycles, according to claim 3, wherein the battery holder (101) comprises:

a frame body (101a) of insulating material, and

a conductive sheet (101b) fixed to the frame body;

the positive end and the negative end of each battery cell (102) are welded and fixed with the conducting strips (101b) respectively arranged in the two battery brackets (101).

5. The battery pack for the electric bicycle according to claim 4, wherein the frame body (101a) is formed with a plurality of battery insertion holes (101aa), and both ends of each battery cell (102) are respectively inserted into the battery insertion holes of the two battery supports (101).

6. The battery pack for electric bicycles of claim 4, wherein the frame body (101a) is an integral injection molding structure.

7. The battery pack for electric bicycles of claim 6, wherein the conductive sheet (101b) is insert-molded in the frame body (101 a).

8. The battery pack for the electric bicycle according to claim 7, wherein the conductive sheet (101b) is formed with a process notch and a welding positioning hole, and the conductive sheet (101b) is formed with a flange.

9. The battery pack for electric bicycles of claim 4, wherein one end of the frame body (101a) is formed with a convex hull (101ab) protruding outward.

10. The battery pack for the electric bicycle according to claim 3, wherein the upper cover (3) and the lower shell (2) are fixed by vibration friction welding, and ribs with a drawing angle are arranged on the periphery of the inner wall of the lower shell (2).