CN219476940U - Battery pack - Google Patents

Abstract

The utility model provides a battery pack, which is an L-shaped battery pack formed by folding more than two single cells in half through terminal connecting sheets, and is characterized in that an insulating plate is arranged between the end faces of the batteries of two adjacent single cells, the insulating plate is provided with a notch, and the shape of the notch corresponds to the shape of the folded part of the terminal connecting sheets.

Description

Battery pack

Technical Field

The present utility model relates to a battery pack, and more particularly, to an L-shaped battery pack with an insulating plate.

Background

The battery pack is generally formed by connecting a plurality of single cells in series and/or parallel via terminal connection sheets. The arrangement modes of the plurality of single cells are roughly divided into two types of F-type and L-type, wherein the F-type refers to that more than two single cells are arranged side by side left and right; the "L-shape" means that two or more single cells are arranged end to end up. The terminal connecting sheet is usually a long nickel sheet, more than two single cells are arranged into an F shape in a positive-negative staggered mode, two ends of the long nickel sheet are respectively spot-welded on a positive electrode terminal and/or a negative electrode terminal of an adjacent single cell, and then the terminal connecting sheet is folded in half by a tool or manually and slightly extruded for shaping, so that the long battery pack connected end to end is formed.

However, the long nickel plate has a certain bending radius after being folded in half, and cannot be completely flattened, so that unevenness exists at the end face of the battery. In order to overcome the above problems, a method is adopted in which an insulating plate pad with back adhesive on two sides is adopted to support the battery to be flat in the middle of a nickel sheet after bending, and the gap generated by bending the nickel sheet can be filled in the method, but the gap generated by the thickness of the nickel sheet is not filled, so that the battery is not firmly fixed. In addition, since the insulating plate is attached between the nickel plates, the size of the battery pack is increased, and thus, a product having strict size requirements is not suitable.

Disclosure of Invention

The utility model aims to provide a battery pack, which can prevent unevenness at the end face of a battery and ensure the dimensional stability of an L-shaped battery pack by adopting an insulating plate with a specific shape.

The battery pack of the present utility model is an L-shaped battery pack in which two or more unit cells are folded in half by a terminal connecting piece, and is characterized in that an insulating plate is provided between the end faces of the cells of two adjacent unit cells, the insulating plate has a notch, and the shape of the notch corresponds to the shape of the folded portion of the terminal connecting piece.

Preferably, the thickness of the insulating plate is equal to or greater than the bending thickness of the terminal connecting sheet.

Preferably, at least one surface of the insulating plate is provided with a backing adhesive layer.

Preferably, the insulating plate has a contour shape corresponding to the battery end face.

Preferably, the corners of the folded parts of the terminal connecting pieces are not exposed out of the end faces of the battery.

Preferably, the terminal connecting piece is made of a metallic nickel sheet.

Preferably, the single cell is a cylindrical cell.

Preferably, the insulating plate is made of synthetic paper.

Preferably, the unit cell is a nickel-hydrogen secondary battery or a lithium secondary battery.

Effects of the utility model

In the battery pack of the utility model, the insulation board with a specific shape is adopted, so that the unevenness of the battery end face caused by the doubling-up of the terminal connecting sheet can be prevented, and the dimensional stability of the L-shaped battery pack can be ensured. And through making at least one face area gum of insulation board, can more firmly paste the battery, when guaranteeing that the battery terminal surface is leveled, further reduce the influence to group battery size.

Drawings

Fig. 1 is a schematic view showing a state of an L2 spot welding process in the related art, (a) showing a front view of a spot welding state of two unit cells; (b) a side view showing a spot welding state of two single cells; (c) A front view showing the state of the assembled L-shaped battery pack; (d) A partial enlarged view showing the state of the assembled L-shaped battery pack.

Fig. 2 is a schematic diagram showing a state in which insulating plates in the related art are interposed between battery end faces of two single cells.

Fig. 3 is a schematic view showing a state of a battery pack assembled by using an insulating plate according to the related art, (a) a side view, and (b) a partial enlarged view.

Fig. 4 is a schematic view showing the shape of an insulating plate used in the battery pack of the present utility model, (a) a plan view, and (b) a side view.

Fig. 5 is a schematic view showing a state in the process of assembling the assembled battery of the present utility model, (a) a plan view, and (b) a front view.

Fig. 6 is a schematic view showing the assembled battery pack of the present utility model, (a) a side view, and (b) a partially enlarged view.

Detailed Description

Fig. 1 is a state diagram showing an L2 spot welding process in the related art. In the present specification, the "L2 spot welding process" refers to a spot welding process in which positive and negative electrode terminals of two unit cells, which are vertically inclined and opposed, are connected to terminal connecting pieces by manual spot welding, thereby forming an L-shaped battery pack.

As shown in fig. 1, two single cells (1) were vertically inclined and opposed as shown in fig. 1 (a), and after the position of the terminal connecting piece (2) was adjusted as shown in fig. 1 (b), manual spot welding was performed to obtain an L-shaped battery pack shown in fig. 1 (c). As can be seen from the enlarged partial view of fig. 1 (d), since the nickel plate as the terminal connecting plate (2) has a certain bending radius after being folded in half, the assembled L-shaped battery pack (3) has a height difference at the battery end face, and there is a problem of uneven end face.

In order to solve the above problems, in the prior art, as shown in fig. 2, a rectangular insulating plate (4) is used so as to be interposed between the folded portions of the terminal connecting pieces (2), thereby reducing the phenomenon of uneven end surfaces of the battery.

Fig. 3 is a schematic view showing a state of a battery pack assembled by using an insulating plate according to the related art, (a) a side view, and (b) a partial enlarged view.

As can be seen from fig. 3 (a) and 3 (b), in the L-shaped battery pack (3), the insulating plate (4) is adopted to be supported in the middle of the bent terminal connecting piece (2), so that the problem of uneven end surfaces of the battery is solved to a certain extent.

However, although this method can fill the gap generated by bending the terminal connection piece (2), i.e., the nickel piece, the gap generated by the thickness of the nickel piece itself is not filled, and thus the fixation of the battery is not stable. In addition, the insulating plate (4) is attached in the middle of the nickel sheet, so that the size of the L-shaped battery pack is increased, the stability is poor, and the battery pack is not suitable for products with strict requirements on the size of the battery pack.

The battery pack is characterized in that an insulating plate with a specific shape is adopted, specifically, a notch with a specific shape is arranged on the insulating plate, and the area of the insulating plate corresponding to the position of the terminal connecting sheet is subjected to abdication, so that gaps generated by the thickness of the nickel sheet are filled, and the phenomenon of uneven end faces of the battery is reduced.

Next, a specific embodiment of the battery pack according to the present utility model will be described with reference to the drawings.

Fig. 4 is a schematic view showing the shape of an insulating plate used in the battery pack of the present utility model, wherein the insulating plate (4) has a rectangular notch (5) as shown in a plan view in fig. 4 (a), and the rectangular notch (5) is configured to be a relief corresponding to the shape of the folded portion of the terminal connecting piece (2).

The shape of the notch (5) is not necessarily rectangular, and may be any other shape as long as it corresponds to the shape of the folded portion of the terminal connecting piece.

As seen from the side view of fig. 4 (b), the insulating plate (4) has a certain thickness. The thickness is preferably twice or more the thickness of the terminal connecting piece (2), i.e., the nickel piece. Since the insulating plate (4) having the above thickness can fill the height difference in the battery end face of the L-shaped battery pack (3) due to the thickness of the nickel plate itself, the fixation of the battery becomes comparatively stable.

The thickness of the insulating plate (4) is preferably equal to or greater than the thickness of the folded terminal connecting piece (2) (hereinafter, simply referred to as "folded thickness"). The "bending thickness" includes not only the thickness of the nickel sheet itself (i.e., twice the thickness of the nickel sheet) but also the bending thickness resulting from the double-over of the nickel sheet. In this way, not only the height difference due to the thickness of the nickel plate itself but also the gap due to bending of the nickel plate is filled, and therefore, the flatness of the battery end face is further ensured.

Preferably, a back adhesive layer is provided on at least one surface of the insulating plate (4), and more preferably, back adhesive layers are provided on both surfaces of the insulating plate (4), respectively, so that the battery can be more firmly fixed.

Preferably, the insulating plate (4) has an outer shape corresponding to the end face of the battery. Under the condition, the thickness of the insulating plate is larger than or equal to the bending thickness of the terminal connecting sheet, so that the contact surface between the insulating plate and the end face of the battery is increased to the greatest extent, the insulating plate with the back adhesive layer on the two sides can be used for firmly adhering the battery, and the influence on the size of the battery pack is further reduced.

Fig. 5 is a schematic view showing a state in the process of assembling the assembled battery of the present utility model, (a) a plan view, and (b) a front view.

The battery pack of the present utility model may be assembled using an L2 spot welding process. Firstly, as shown in fig. 5 (a) and 5 (b), two single cells (1) are vertically and obliquely opposed, then, positive and negative terminals of the two single cells (1) are respectively spot-welded at two ends of a long nickel sheet (2), after the spot welding is completed, an insulating plate (4) with a notch and with a back adhesive on two sides is attached to the end face of the battery of one single cell (1), so that the notch (5) on the insulating plate (4) is just away from the position where the folded part of the nickel sheet (2) is located, finally, the other single cell (1) is folded, and meanwhile, the nickel sheet (2) serving as a terminal connecting sheet is folded in half, so that the two single cells (1) are coaxial, and the L-shaped battery pack with the insulating plate is obtained.

Fig. 6 is a schematic view showing the assembled state of the assembled battery (3) of the present utility model, (a) a side view, and (b) a partially enlarged view.

As can be seen from fig. 6 (a) and 6 (b), the insulating plate (4) fills most of the gaps between the battery end faces of the two single cells (1) except for the positions of the nickel plates (2), so that a battery pack (3) with flat battery end faces and stable overall size can be obtained.

In the utility model, the two surfaces of the insulating plate are preferably provided with the back adhesive layers for respectively fixing two single cells, so that the insulating plate can firmly adhere to the cells; in addition, the thickness of the insulating plate is preferably equal to or greater than the bending thickness of the nickel plate, and thus, not only is the height difference due to the thickness of the nickel plate itself filled, but also the gap due to bending of the nickel plate is filled, and therefore, the flatness of the battery end face can be further ensured.

In the present utility model, the material of construction of the insulating plate and the terminal connecting piece is not particularly limited, and the insulating plate is preferably made of synthetic paper, and the terminal connecting piece is made of metallic nickel sheet.

Because the L2 type spot welding mode of manual spot welding is adopted in the assembly of the battery pack, the terminal connecting sheet with shorter length can be adopted. Therefore, the folded corners of the terminal connecting sheet are not exposed out of the end face of the battery after being bent, and the safety of the battery pack is further ensured.

The unit cell is preferably a cylindrical battery, and more preferably a nickel-hydrogen secondary battery or a lithium secondary battery.

While the battery pack of the present utility model has been described with reference to the drawings and the embodiments, the present utility model is not limited to the embodiments described above, and various modifications and element changes may be made without departing from the spirit of the present utility model, and these modifications and element changes are also included in the scope of the present utility model.

Claims (9)

1. The battery pack is an L-shaped battery pack formed by folding more than two single cells in half through terminal connecting sheets, and is characterized in that an insulating plate is arranged between the end faces of the batteries of two adjacent single cells, the insulating plate is provided with a notch, and the shape of the notch corresponds to the shape of the folded part of the terminal connecting sheets.

2. The battery pack according to claim 1, wherein the thickness of the insulating plate is equal to or greater than the bending thickness of the terminal connecting piece.

3. The battery according to claim 1 or 2, wherein at least one surface of the insulating plate is provided with a backing adhesive layer.

4. A battery according to claim 3, wherein the insulating plate has an outline shape corresponding to the battery end face.

5. The battery pack according to claim 3, wherein corners of the folded portions of the terminal connection tabs are not exposed to the battery end face.

6. The battery pack according to claim 1 or 2, wherein the terminal connection sheet is made of a metallic nickel sheet.

7. The battery pack according to claim 1 or 2, wherein the single cells are cylindrical cells.

8. The battery pack according to claim 1 or 2, wherein the insulating plate is made of synthetic paper.

9. The battery pack according to claim 1 or 2, wherein the unit cell is a nickel-hydrogen secondary battery or a lithium secondary battery.