Novel winding type battery

Abstract

The utility model discloses a novel winding type battery, which comprises an aluminum shell, the battery cell is arranged in the aluminum shell; each heat dissipation piece comprises a plate surface and a vertical rod arranged on the plate surface; the vertical rods of the pair of heat dissipation pieces are respectively inserted into the shaft core cavities of the battery core, and the two vertical rods are not in contact with each other; one sides of the plate surfaces of the pair of heat dissipation pieces are respectively connected with positive and negative plates of the battery cell, and the other sides of the plate surfaces of the pair of heat dissipation pieces are respectively connected with positive and negative terminals. According to the novel winding type battery provided by the utility model, the vertical rods of the pair of heat dissipation pieces are respectively inserted into the shaft core cavities of the battery core, when the temperature in 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, and the accumulated heat in the battery core can be quickly conducted to the end cover through the vertical rods during working; the safety and the cycle life are improved; and the plate surface is used as a current collecting plate and is connected with the battery cell and the end cover to lead out current, so that the internal structural parts are few, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a novel wound battery. Background Art

[0002] A wound battery is a cylindrical battery made by winding positive and negative electrodes and a separator in layers, also known as a "soft-pack battery". It is characterized by a relatively small volume and high shape plasticity, so it can be applied to some relatively narrow spaces. Based on the developed technology and wide application fields, the wound battery will show a trend of being lighter and thinner. Moreover, the wound battery will develop a higher energy density, which means that more energy can be stored in a single battery cell, providing more lasting power support.

[0003] However, there are problems with existing wound batteries: wound batteries are also vulnerable to external forces, such as mechanical extrusion or high temperature. It is difficult for the heat inside the battery to dissipate to the battery surface. Especially in the field of fast charging, the increasing charging rate will inevitably cause higher battery temperature rise, posing higher requirements for the safety performance and heat dissipation effect of the battery. That is, how to effectively dissipate heat from wound batteries is an urgent technical problem to be solved. Summary of the Utility Model

[0004] Based on this, in view of the above technical problems, it is necessary to provide a novel wound battery.

[0005] The utility model is realized through the following technical solutions:

[0006] A novel wound battery, which includes:

[0007] An aluminum shell;

[0008] A battery cell, which is arranged inside the aluminum shell;

[0009] A pair of heat dissipation components, which include a plate surface and upright rods arranged on the plate surface; the upright rods of the pair of heat dissipation components are respectively inserted into the axial core cavities of the battery cell, and the two upright rods do not contact; one sides of the plate surfaces of the pair of heat dissipation components are respectively connected to the positive and negative electrode plates of the battery cell, and the other sides are respectively connected to positive and negative terminal electrodes.

[0010] As a preferred embodiment of the novel wound battery provided by the utility model, a heat conduction coating is arranged on the surface of the heat dissipation component.

[0011] As a preferred embodiment of the novel wound battery provided by the utility model, the heat conduction coating is a graphene coating.

[0012] As a preferred embodiment of the novel wound battery provided by the utility model, an insulating layer is arranged on the surface of the upright rod.

[0013] As a preferred embodiment of the novel wound battery provided by the present invention, the plate surface is provided with an air flow channel.

[0014] As a preferred embodiment of the novel wound battery provided by the present invention, the air flow channel is a hollow hole and / or a convex groove.

[0015] As a preferred embodiment of the novel wound battery provided by the present invention, the heat sink is made of aluminum or copper.

[0016] As a preferred embodiment of the novel wound battery provided by the present invention, the heat sink is an integrally formed structural component.

[0017] As a preferred embodiment of the novel wound-type battery provided by the present invention, the aluminum shell is a barrel-shaped shell having an open end, which serves as a negative terminal; the wound-type battery further includes an end cover, which is encapsulated at the open end, and the end cover serves as a positive terminal or has a positive terminal;

[0018] or

[0019] The aluminum shell is a tubular shell with two open ends; the wound battery also includes two end covers, which are respectively encapsulated at the open ends and serve as positive and negative terminals or have positive and negative terminals respectively.

[0020] As a preferred embodiment of the novel wound battery provided by the present invention, the shape of the wound battery is cylindrical, flat or square.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The novel wound-type battery provided by the present invention has a pair of heat sinks, and the vertical rods of the pair of heat sinks are respectively inserted into the axial core cavity 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, and the plate surface and the end cover are thermally coupled to dissipate the 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. Furthermore, the plate surfaces of the pair of heat sinks are respectively connected to the positive and negative electrodes of the battery cell, and the plate surfaces are also respectively connected to the end covers. The plate surfaces not only serve as current collecting plates, but are 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.

[0023] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the present invention.

[0024] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the solutions in the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a three-dimensional schematic diagram of the overall structure of a new type of wound battery provided by the present utility model;

[0027] Figure 2 For Figure 1 exploded schematic diagram;

[0028] Figure 3 It is a schematic diagram of the structure of the heat dissipation component in the present utility model;

[0029] Figure 4 It is a three-dimensional schematic diagram of the overall structure of a new type of wound battery provided by the present utility model;

[0030] Figure 5 For Figure 4 exploded schematic diagram. Detailed implementation manners

[0031] In order to enable those in the technical field to better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] In order to enable those in the technical field to better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings.

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0034] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] Please refer to Figure 1 、 2 , which shows a new type of wound battery provided by the present utility model. The wound battery includes: aluminum shell 1, battery cell 2, heat dissipation component 3, and end cap 4.

[0036] The outer casings of the battery mainly include three types: steel casings, aluminum casings, and aluminum-plastic films. Due to its advantages such as corrosion resistance, light weight, and good processing performance, the aluminum casing 1 is preferably used in this embodiment. The aluminum casing 1 is a tubular casing 1a with a straight tubular structure, and both ends are not closed and are open ends.

[0037] The battery cell 2 is disposed inside the aluminum casing 1. The battery cell 2 is formed by winding a positive electrode plate, a separator, and a negative electrode plate stacked in sequence. Among them, one side edges of the positive electrode plate and the negative electrode plate extend out of the separator in different directions respectively. After being wound into the battery cell 2, the edges extending out of the separator are flattened, which is convenient for the plate surface 31 of the heat dissipation member 3 to be laser-connected to the flattened battery cell 2 subsequently.

[0038] As Figure 3 shown, the wound battery of this embodiment has a pair of heat dissipation members 3. Each heat dissipation member 3 includes a plate surface 31 and a vertical rod 32 provided on the plate surface 31. The vertical rod 32 preferably extends upward from the center of one surface of the plate surface 31. Among them, the outer diameter of the plate surface 31 can be slightly larger than the outer diameter of the battery cell 2 and smaller than the inner diameter of the aluminum casing 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 members 3 are respectively connected to the positive and negative electrode plates of the battery cell 2 to serve as current collecting plates. As Figure 2 shown, the plate surface of the heat dissipation member located below the battery cell 2 is connected to the negative electrode plate of the battery cell 2 to serve as a negative electrode connecting member, and the plate surface of the heat dissipation member located above the battery cell 2 is connected to the positive electrode plate of the battery cell 2 to serve as a positive electrode connecting member.

[0039] The vertical rods 32 of the pair of heat dissipation members 3 are respectively inserted into the axial core cavity 21 of the battery cell 2 from both ends of the battery cell 2. The heat in the central area of the battery cell 2 can be conducted to the plate surface 31 through the vertical rods 32 and then dissipated through the end cover 4, which can effectively improve the heat generation situation in the central area inside the battery cell 2, effectively reduce the internal temperature. At the same time, when the vertical rods 32 are inserted into the axial core cavity 21, they can also play a role in supporting the battery cell 2, avoiding the collapse of the battery cell 2 caused by the expansion of the electrode plates during the charging and discharging process of the battery, and improving the battery cycle life and safety performance. Further, the two vertical rods 32 located inside the axial core cavity 21 of the battery cell 2 do not contact each other to avoid short circuit. More preferably, an insulating film is formed on the surface of the vertical rod 32 by evaporation plating, sputtering, etc.

[0040] The end caps 4 are respectively provided at the open ends of the aluminum shell 1. The end caps 4 can serve as positive and negative terminals and are respectively connected to the plate surface 31 of the heat sink 3, wherein the end caps 4 and the aluminum shell 1 are insulated from each other. In another embodiment, the end cap 4 has positive and negative terminals, such as a pole 41 provided on the end cap 4, and the pole 41 is electrically connected to the plate surface 31. The plate surface 31 and the end cap 4 form a thermal coupling relationship, and the end cap 4 can serve as a heat dissipation surface to dissipate the heat transferred into the plate surface 31 from the end cap 4 in a timely manner. The material of the end cap 4 is preferably a metal material with good thermal conductivity, which is more conducive to heat dissipation. The edge end of the end cap 4 and the inner surface of the aluminum shell 1 are insulated to prevent short circuit. The material of the end cap 4 can also be a plastic material, and a through hole can be opened on the end cap 4 to help dissipate heat. Injection holes can be opened on both the end cap 4 and the heat sink 3 to facilitate the injection of liquid into the aluminum shell.

[0041] The heat sink 3 is made of aluminum or copper, or other metal materials with good thermal conductivity. Preferably, the heat sink 3 is an integrally formed structural member, that is, the plate surface 31 and the vertical rod 32 are integrally formed.

[0042] To better guide and dissipate the heat generated within the battery cell 2, the surface of the heat sink 3 is provided with a thermally conductive coating. Preferably, the thermally conductive coating is a graphene coating. Graphene has excellent thermal conductivity and enables efficient heat transfer, quickly guiding heat energy from the battery cell 2 to the heat sink 3.

[0043] Furthermore, the plate surface 31 is provided with an air flow channel. The air flow channel can be a hollow hole or a convex groove 33, such as Figure 3 As shown. The convex groove can include an upper convex groove formed by a localized upward protrusion of the plate surface, and / or a lower convex groove formed by a localized downward depression of the plate surface. Providing airflow channels facilitates the flow of gas and electrolyte within the wound battery. The convex groove can also serve as a welding groove, facilitating welding connections to the positive and negative electrode sheets or terminals.

[0044] Furthermore, the shape of the wound battery can be cylindrical, flat, square, etc.

[0045] The difference between this embodiment and embodiment 1 is that: Figure 4 、 5 As shown, the aluminum shell 1 is a barrel-shaped shell 1b with an open end, which serves as a negative terminal. The plate surface of the heat sink connected to the negative electrode of the battery cell 2 abuts against the aluminum shell and is connected thereto; the wound battery also includes an end cover 4, which is encapsulated in the open end of the barrel-shaped shell 1b. The end cover 4 can directly serve as a positive terminal, and this end cover 4 and the barrel-shaped shell 1b are insulated from each other; in another embodiment, the end cover 4 can have a positive terminal, such as the pole described in Example 1.

[0046] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all of them. The accompanying drawings show the preferred embodiments of the present utility model, but do not limit the patent scope of the present utility model. The present utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present utility model in other related technical fields shall be within the scope of the patent protection of the present utility model by the same token.

Claims

1. A novel wound battery, characterized in that, It includes: An aluminum shell; A battery cell, which is disposed inside the aluminum shell; A pair of heat dissipation components, which include a plate surface and upright rods disposed on the plate surface; The upright rods of the pair of heat dissipation components are respectively inserted into the axial core cavities of the battery cell, and the two upright rods do not contact; one side of the plate surfaces of the pair of heat dissipation components is respectively connected to the positive and negative electrode plates of the battery cell, and the other side is respectively connected to the positive and negative terminal ends.

2. The novel winding type battery according to claim 1, characterized in that, A heat conduction coating is provided on the surface of the heat dissipation component.

3. The novel winding battery according to claim 2, wherein, The heat conduction coating is a graphene coating.

4. The novel winding type battery according to claim 1, characterized in that, An insulating layer is provided on the surface of the upright rod.

5. The novel winding type battery according to claim 1, wherein An air flow channel is provided on the plate surface.

6. The novel winding type battery according to claim 5, wherein, The air flow channel is a hollow hole and / or a convex groove.

7. The novel winding type battery according to claim 1, characterized in that, The material of the heat dissipation component is aluminum or copper.

8. The novel winding type battery according to claim 1, characterized in that, The heat dissipation component is an integrally formed structural component.

9. The novel wound battery according to claim 1, wherein The aluminum shell is a barrel-shaped shell with an open end, which serves as the negative terminal end; the wound battery further includes an end cap, which is encapsulated at the open end, and the end cap serves as the positive terminal end or has a positive terminal end; Or The aluminum shell is a tubular shell with double open ends; the wound battery further includes two end caps, which are respectively encapsulated at the open ends and respectively serve as the positive and negative terminal ends or respectively have the positive and negative terminal ends.

10. The novel winding type battery according to claim 1, wherein The shape of the wound battery is cylindrical or flat or square.

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