CN223167530U - Novel winding type battery - Google Patents

Abstract

The utility model discloses a novel wound-type battery, which comprises: an aluminum shell; a battery cell, which is arranged in the aluminum shell; a pair of heat sinks, which comprise a plate surface and a vertical rod arranged on the plate surface; the vertical rods of the pair of heat sinks are respectively inserted into the core cavities of the battery cell, and the two vertical rods do not touch; one side of the plate surface of the pair of heat sinks is respectively connected to the positive and negative electrode sheets of the battery cell, and the other side is respectively connected to the positive and negative terminals. The novel wound-type battery provided by the utility model has a pair of heat sink vertical rods respectively inserted into the core cavities of the battery cell. When the internal temperature of the battery is too high, the vertical rods absorb heat and conduct it to the plate surface. The plate surface and the end cover are thermally coupled to dissipate heat. During operation, the accumulated heat inside the battery cell can be quickly conducted to the end cover through the vertical rods, thereby improving safety and cycle life. The plate surface not only serves as a current collecting plate, but is also connected to the battery cell and the end cover to draw out current. In this way, there are fewer internal structural parts and the cost is low.

Description

Novel winding type battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a novel winding type battery.

Background

A wound battery is a cylindrical battery made by layering and winding positive and negative electrodes and a separator, and is also called a "pouch battery". It features relatively small volume and high shape plasticity, so it can be used in narrow space. Based on the development of technology and wide application fields, wound batteries will show a trend towards lighter and thinner materials, and further wound batteries will develop higher energy densities, which means that more energy can be stored in the battery cells, leading to longer lasting power support.

However, the existing wound battery has the problems that the wound battery is also easily affected by external force, such as mechanical extrusion or high temperature, and the heat in the battery is difficult to diffuse to the surface of the battery, especially in the field of fast charging, the higher the temperature rise of the battery is caused by the larger and larger charging multiplying power, and higher requirements are put forward on the safety performance and the heat dissipation effect of the battery. That is, how to effectively dissipate heat of the wound battery is an urgent technical problem to be solved.

Disclosure of utility model

In view of the above, it is necessary to provide a novel wound battery.

The utility model is realized by the following technical scheme:

a novel wound battery, comprising:

An aluminum shell;

The battery cell is arranged in the aluminum shell;

The pair of heat dissipation parts comprises a plate surface and vertical rods arranged on the plate surface, the pair of vertical rods of the heat dissipation parts are respectively inserted into the shaft core cavity of the battery cell, the two vertical rods are not contacted, one side of the plate surface of each pair of heat dissipation parts is respectively connected with the positive and negative pole pieces of the battery cell, and the other side of the plate surface of each pair of heat dissipation parts is respectively connected with the positive and negative poles.

As a preferred embodiment of the novel coiled battery provided by the utility model, the surface of the heat dissipation element is provided with a heat conduction coating.

As a preferred embodiment of the novel coiled battery provided by the utility model, the heat-conducting coating is a graphene coating.

As a preferred embodiment of the novel winding type battery provided by the utility model, the surface of the vertical rod is provided with an insulating layer.

As a preferred embodiment of the novel wound battery provided by the utility model, the plate surface is provided with an air flow channel.

As a preferred embodiment of the novel winding type battery provided by the utility model, the air flow channel is a hollowed-out hole and/or a convex groove.

As a preferred embodiment of the novel coiled battery provided by the utility model, the heat dissipation member is made of aluminum or copper.

As a preferred embodiment of the novel coiled battery provided by the utility model, the heat dissipation piece is an integrally formed structural piece.

As a preferred embodiment of the novel wound battery provided by the utility model, the aluminum shell is a barrel-shaped shell with an open end and is used as a negative electrode terminal;

Or (b)

The aluminum shell is a tubular shell with double open ends, and the coiled battery also comprises two end covers which are respectively encapsulated at the open ends and respectively used as positive and negative terminals or respectively provided with positive and negative terminals.

As a preferred embodiment of the novel wound battery provided by the utility model, the wound battery is cylindrical, flat or square in shape.

Compared with the prior art, the utility model has the following beneficial effects:

The novel winding type battery provided by the utility model is provided with a pair of heat dissipation parts, wherein the vertical rods of the pair of heat dissipation parts are respectively inserted into the shaft core cavity of the battery core, when the internal temperature of the battery is too high, the vertical rods absorb heat and conduct the heat to the plate surface, the plate surface and the end cover are thermally coupled to dissipate heat, the accumulated heat in the battery core can be rapidly led out to the end cover through the vertical rods during operation, the safety and the cycle life are improved, the plate surfaces of the pair of heat dissipation parts are respectively connected with the positive and negative pole pieces of the battery core, the plate surfaces are respectively connected with the end cover, the plate surface is used as a current collecting disc and connected with the battery core and the end cover, and the current is led out.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.

For a better understanding and implementation, the present utility model is described in detail below with reference to the drawings.

Drawings

In order to more clearly illustrate the solution of the present utility model, a brief description will be given below of the drawings required for the description of the embodiments, it being obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of the whole structure of a novel winding type battery provided by the utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic diagram of a heat sink according to the present utility model;

Fig. 4 is a schematic perspective view of the overall structure of a novel winding type battery provided by the utility model;

Fig. 5 is an exploded view of fig. 4.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In order to make the person skilled in the art better understand the solution of the present utility model, the technical solution of the embodiment of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

It should be noted that, under the condition of no conflict, the embodiments of the present utility model and the features and technical solutions in the embodiments may be combined with each other.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Referring to fig. 1 and 2, a novel winding type battery provided by the utility model is shown. The winding type battery comprises an aluminum shell 1, an electric core 2, a heat dissipation piece 3 and an end cover 4.

The battery shell mainly comprises three types of steel shells, aluminum shells and aluminum plastic films, and the aluminum shell 1 is preferably adopted in the embodiment because the aluminum shell 1 has the advantages of corrosion resistance, light weight, good processability and the like. The aluminum shell 1 is a tubular shell 1a with a straight tubular structure, and both ends are not closed and are open ends.

And the battery cell 2 is arranged in the aluminum shell 1. The battery cell 2 is formed by sequentially laminating and winding a positive plate, a diaphragm and a negative plate, wherein one side edges of the positive plate and the negative plate extend out of the diaphragm towards different directions respectively, after the battery cell 2 is rolled, the edge extending out of the diaphragm is subjected to rubbing treatment, and then the plate surface 31 of the convenient heat dissipation piece 3 is connected onto the rubbed battery cell 2 through laser.

As shown in fig. 3, the wound battery of the present embodiment has a pair of heat dissipation members 3, each heat dissipation member 3 includes a plate surface 31 and a vertical bar 32 provided on the plate surface 31, and the vertical bar 32 is preferably formed to extend upward at the center of one surface of the plate surface 31. The outer diameter of the plate 31 may be slightly larger than the outer diameter of the battery cell 2 and smaller than the inner diameter of the aluminum case 1. The height of the vertical rod 32 is less than 1/2 of the height of the battery cell 2. The plate surfaces 31 of the pair of heat dissipation elements 3 are respectively connected with the positive and negative plates of the battery cell 2 to serve as current collecting plates. As shown in fig. 2, the plate surface of the heat sink located at the lower part of the battery cell 2 is connected with the negative electrode plate of the battery cell 2 to serve as a negative electrode connecting piece, and the plate surface of the heat sink located at the upper part of the battery cell 2 is connected with the positive electrode plate of the battery cell 2 to serve as a positive electrode connecting piece.

The vertical rods 32 of the pair of heat dissipation elements 3 are respectively inserted into the shaft core cavity 21 of the battery core 2 from the two ends of the battery core 2, heat in the central area of the battery core 2 can be conducted to the plate surface 31 through the vertical rods 32 and then dispersed out through the end cover 4, the heating condition of the central area inside the battery core 2 can be effectively improved, the internal temperature is effectively reduced, meanwhile, the effect of supporting the battery core 2 can be achieved through the insertion of the vertical rods 32 into the shaft core cavity 21, the collapse of the battery core 2 caused by the expansion of the pole pieces in the battery charging and discharging process is avoided, and the cycle life and the safety performance of the battery can be improved. Further, the two vertical rods 32 in the shaft core cavity 21 of the battery cell 2 are not contacted with each other, so that short circuit is avoided. More preferably, an insulating film is formed on the surface of the vertical bar 32 by vapor deposition, sputtering, or the like.

And end covers 4 respectively arranged at the opening ends of the aluminum shell 1. The end caps 4 can be connected as positive and negative terminals with the plate surfaces 31 of the heat sink 3, respectively, wherein the end caps 4 are insulated from the aluminum case 1. In another embodiment, the end cap 4 has positive and negative terminals, for example, the end cap 4 is provided with a post 41, and the post 41 is electrically connected to the plate 31. The plate surface 31 and the end cover 4 form a thermal coupling relationship, and the end cover 4 can serve as a radiating surface to radiate heat conducted into the plate surface 31 from the end cover 4 in time. The material of the end cover 4 is preferably a metal material with good thermal conductivity, which is more favorable for heat dissipation. Insulation treatment is carried out between the edge end of the end cover 4 and the inner surface of the aluminum shell 1, so that the short circuit phenomenon can not occur. The end cover 4 may be made of plastic, and a through hole may be formed in the end cover 4 to facilitate heat dissipation. Liquid injection holes can be formed in the end cover 4 and the heat dissipation piece 3, so that liquid can be conveniently injected into the aluminum shell.

The heat sink 3 is made of aluminum or copper, and may be made of other metal materials having good thermal conductivity. Preferably, the heat sink 3 is an integrally formed structural member, i.e. the plate surface 31 and the standing bar 32 are integrally formed.

In order to better guide and dissipate the heat energy generated inside the battery cell 2 rapidly, the surface of the heat sink 3 is provided with a heat conductive coating. Preferably, the thermally conductive coating is a graphene coating. The graphene has good thermal conductivity, and can perform high-efficiency heat transmission so as to rapidly guide out heat energy from the inside of the battery cell 2 to the heat dissipation part 3.

Further, the plate surface 31 is provided with an air flow passage. The air flow channel may be a hollow hole or a convex groove 33, as shown in fig. 3. The convex groove can be an upper convex groove formed by upward protrusion of a local area of the plate surface, and/or a lower convex groove formed by downward recession of the local area of the plate surface. By providing the air flow channel, the circulation of gas and electrolyte in the winding type battery is facilitated. The convex groove can also be used as a welding groove, so that the welding connection with the positive and negative plates or the positive and negative terminals is facilitated.

Further, the shape of the wound battery may be a cylindrical shape, a flat shape, a square shape, or the like.

This embodiment is different from embodiment 1 in that the aluminum case 1 is a tub-shaped case 1b having an open end as a negative electrode terminal, the plate surface of the heat sink connected to the negative electrode tab of the battery cell 2 is abutted against and connected to the aluminum case, the wound battery further includes an end cap 4 sealed at the open end of the tub-shaped case 1b, the end cap 4 can directly serve as a positive electrode terminal, the end cap 4 is insulated from the tub-shaped case 1b, and the end cap 4 can have a positive electrode terminal, as in the case of embodiment 1.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interactive relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It is apparent that the above-described embodiments are only some embodiments of the present utility model, but not all embodiments, and the preferred embodiments of the present utility model are shown in the drawings, which do not limit the scope of the patent claims. This utility model may be embodied in many different forms, but rather, embodiments are provided in order to provide a thorough and complete understanding of the present disclosure. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing description, or equivalents may be substituted for elements thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.

Claims (10)

1. A novel wound battery, characterized in that it comprises:

An aluminum shell;

The battery cell is arranged in the aluminum shell;

The pair of heat dissipation parts comprises a plate surface and vertical rods arranged on the plate surface, the pair of vertical rods of the heat dissipation parts are respectively inserted into the shaft core cavity of the battery cell, the two vertical rods are not contacted, one side of the plate surface of each pair of heat dissipation parts is respectively connected with the positive and negative pole pieces of the battery cell, and the other side of the plate surface of each pair of heat dissipation parts is respectively connected with the positive and negative poles.

2. The novel wound battery of claim 1, wherein the surface of the heat sink is provided with a thermally conductive coating.

3. The novel wound battery of claim 2, wherein the thermally conductive coating is a graphene coating.

4. The novel wound battery of claim 1, wherein the surface of the vertical rod is provided with an insulating layer.

5. The novel wound battery of claim 1, wherein the plate face is provided with an air flow channel.

6. The novel wound battery of claim 5, wherein the air flow channels are hollowed-out holes and/or grooves.

7. The novel wound battery of claim 1, wherein the heat sink is aluminum or copper.

8. The novel coiled battery of claim 1, wherein the heat sink is an integrally formed structural member.

9. The novel wound battery of claim 1, wherein,

The winding type battery also comprises an end cover, a first end cover and a second end cover, wherein the end cover is encapsulated at the opening end and is used as a positive terminal or provided with the positive terminal;

Or (b)

The aluminum shell is a tubular shell with double open ends, and the coiled battery also comprises two end covers which are respectively encapsulated at the open ends and respectively used as positive and negative terminals or respectively provided with positive and negative terminals.

10. The novel wound battery of claim 1, wherein the wound battery is cylindrical or flat or square in shape.