High-capacity cylindrical soft package lithium battery

Abstract

The utility model discloses a high-capacity cylindrical soft package lithium battery which comprises a lithium battery body, an outer heat conduction sleeve is fixedly sleeved outside the lithium battery body, a graphite heat conduction sheet is wrapped inside the outer heat conduction sleeve, the graphite heat conduction sheet is designed to be of a surrounding roll type structure, a battery cell is arranged inside the lithium battery body, and a positive plate is wrapped and wound outside the battery cell. An isolating membrane is wrapped and wound outside the positive plate, a negative plate is wrapped and wound outside one side, far away from the positive plate, of the isolating membrane, and lithium manganate is arranged outside the front surface and the back surface of the positive plate. And due to the structural design of the double-sided lithium manganate, an outer lithium battery structural layer can be omitted, so that the occupancy rate of the internal space of the battery is reduced, the improved space can be used for adding an electric layer structure, the use characteristic of improving the battery capacity can be achieved, and the large-capacity use effect and characteristic are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a large-capacity cylindrical soft-pack lithium battery. Background Art

[0002] A lithium battery is a type of battery with a lithium metal or lithium alloy as the negative electrode material and using a non-aqueous electrolyte solution.

[0003] Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable. The fifth-generation product of rechargeable batteries, the lithium metal battery, was born in 1996, and its safety, specific capacity, self-discharge rate, and performance-price ratio are all superior to those of lithium-ion batteries.

[0004] After long-term use, the internal temperature of the current lithium battery is too high, which easily leads to the inability to effectively export and dissipate the battery temperature, thereby affecting the use safety and service life of the battery. Moreover, the battery capacity of lithium batteries is usually small, affecting the normal use performance. Content of the Utility Model

[0005] The purpose of the utility model is to provide a large-capacity cylindrical soft-pack lithium battery to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a large-capacity cylindrical soft-pack lithium battery, including a lithium battery body, an external heat-conducting sleeve is fixedly sleeved outside the lithium battery body, a graphite heat-conducting sheet is wrapped inside the external heat-conducting sleeve, the graphite heat-conducting sheet is designed in a surrounding and rolled structure, an electric core is arranged inside the lithium battery body, a positive electrode sheet is wrapped and wound outside the electric core, a separator is wrapped and wound outside the positive electrode sheet, a negative electrode sheet is wrapped and wound on the side of the separator away from the positive electrode sheet, and lithium manganate is arranged on both the front and back sides of the positive electrode sheet.

[0007] Preferably, a positive electrode end is fixedly installed on the upper surface of the top end of the lithium battery body.

[0008] Preferably, a negative electrode end is fixedly installed on the outer surface of the bottom end of the lithium battery body.

[0009] Preferably, the negative electrode sheet is arranged in a carbon layer structure.

[0010] Preferably, the outer shell of the lithium battery body is made of PVE material.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] The utility model is provided with an external heat-conducting sleeve outside the lithium battery body. The set external heat-conducting sleeve can provide a certain degree of external protection for the lithium battery body. Inside it, there is a graphite heat-conducting sheet. The set graphite heat-conducting sheet can quickly adsorb and conduct the heat inside the lithium battery body. The heat-conducting coefficient of graphite is very high, reaching -W / (m-k), far exceeding traditional metal materials such as copper and aluminum.

[0013] The high heat-conducting coefficient of graphite means that it can transfer heat from the heat source to the heat dissipation area more quickly, thus improving the heat dissipation efficiency. In addition, the density of graphite is relatively low, about 1 / 3 to 1 / 4 of that of copper and 1 / 2 to 1 / 3 of that of aluminum. This makes it have the characteristics of light weight while maintaining high heat-conducting performance, and can effectively reduce the overall weight of the lithium battery.

[0014] The positive electrode sheet, separator film and negative electrode sheet of the utility model are designed in a wound structure, which can effectively increase the contact area between the sheets. By increasing the contact area, the overall capacity of the battery can be effectively improved. And lithium manganate is arranged on both the front and back of the positive electrode sheet. By improving the material of the positive electrode sheet, the battery capacity and cycle life can be further enhanced. The structure design of double-sided lithium manganate can eliminate the outer lithium battery structure layer, thereby reducing the occupancy rate of the internal space of the battery. The increased space can be used to add an electric layer structure, and thus the use characteristic of improving the battery capacity can also be achieved, having the use effect and characteristics of large capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall external structure of the lithium battery according to the embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the bottom view of the lithium battery according to the embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of the internal coiled structure of the lithium battery body according to the embodiment of the utility model;

[0018] Figure 4 It is a schematic diagram of the internal sectional structure of the external heat-conducting sleeve according to the embodiment of the utility model.

[0019] In the figure: 1. Lithium battery body; 101. Positive electrode end; 102. Negative electrode end; 103. Positive electrode sheet; 104. Separator film; 105. Negative electrode sheet; 2. External heat-conducting sleeve; 3. Graphite heat-conducting sheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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 situations.

[0023] Please refer to Figures 1-4 , an embodiment provided by the present utility model: a large-capacity cylindrical soft-pack lithium battery, including a lithium battery body 1. The outer shell of the lithium battery body 1 is made of PVE material. The PVE material is a polyvinyl ethyl ether material, which has a certain anti-tensile protection effect and can be used as the soft-pack shell of the lithium battery. Specifically, refer to the attached Figure 4 shown in the drawings. An outer heat-conducting sleeve 2 is fixedly sleeved outside the lithium battery body 1. A graphite heat-conducting sheet 3 is wrapped inside the outer heat-conducting sleeve 2. The graphite heat-conducting sheet 3 is designed in a surrounding roll structure, and the outer heat-conducting sleeve 2 is a heat-conducting silica gel sleeve;

[0024] In the present utility model, an outer heat-conducting sleeve 2 is provided outside the lithium battery body 1. The provided outer heat-conducting sleeve 2 can provide a certain external protection for the lithium battery body 1, and a graphite heat-conducting sheet 3 is provided inside it. The provided graphite heat-conducting sheet 3 can quickly adsorb and conduct the heat inside the lithium battery body 1. The heat-conducting coefficient of graphite is very high, which can reach 700 - 1300 W / (m-k), far exceeding traditional metal materials such as copper and aluminum;

[0025] The high thermal conductivity of graphite means that it can transfer heat from the heat source to the heat dissipation area more quickly, thereby improving the heat dissipation efficiency. In addition, the density of graphite is relatively low, about 1 / 4 to 1 / 10 of copper and 1 / 1.3 to 1 / 3 of aluminum. This makes it have the characteristics of light weight while maintaining high thermal conductivity, and can effectively reduce the overall weight of the lithium battery during use;

[0026] Inside the lithium battery body 1, there is a battery cell. The outside of the battery cell is wrapped and wound with a positive electrode plate 103. The outside of the positive electrode plate 103 is wrapped and wound with a separator 104. On the side of the separator 104 away from the positive electrode plate 103, the outside is wound and wrapped with a negative electrode plate 105. Lithium manganate is provided on both the front and back of the positive electrode plate 103. The negative electrode plate 105 is arranged in a carbon layer structure;

[0027] According to the above structure for description, specifically refer to the attached Figure 3 As shown in the figure, the positive electrode plate 103, the separator 104 and the negative electrode plate 105 of the present utility model are designed in a wound structure, which can effectively increase the contact area between the sheets. By increasing the contact area, the overall capacity of the battery can be effectively improved. And lithium manganate is provided on both the front and back of the positive electrode plate 103. By improving the material of the positive electrode plate 103, the battery capacity and cycle life can be further improved. The structure design of double-sided lithium manganate can eliminate the outer lithium battery structure layer, thereby reducing the occupancy rate of the internal space of the battery. The increased space can be used to add an electric layer structure, so as to achieve the use characteristics of improving the battery capacity, and has the use effects and characteristics of a large capacity.

[0028] In this embodiment, in order to ensure the normal use effect of the lithium battery, a positive electrode end 101 is fixedly installed on the upper surface of the top end of the lithium battery body 1;

[0029] Furthermore, a negative electrode end 102 is fixedly installed on the outer surface of the bottom end of the lithium battery body 1.

[0030] Working principle: The user can use the lithium battery of the present utility model through the conventional use method. The present utility model is provided with an outer heat conduction sleeve 2 outside the lithium battery body 1. The provided outer heat conduction sleeve 2 can provide a certain degree of external protection for the lithium battery body 1. And a graphite heat conduction sheet 3 is arranged inside it. The heat inside the lithium battery body 1 can be quickly adsorbed and exported through the provided graphite heat conduction sheet 3. The thermal conductivity of graphite is very high, which can reach 700 - 1300 W / (m-k), far exceeding traditional metal materials such as copper and aluminum;

[0031] The high thermal conductivity of graphite means that it can transfer heat from the heat source to the heat dissipation area more quickly, thereby improving the heat dissipation efficiency. In addition, the density of graphite is relatively low, about 1 / 4 to 1 / 10 of that of copper and 1 / 1.3 to 1 / 3 of that of aluminum. This enables it to have the characteristics of light weight while maintaining high thermal conductivity, and can effectively reduce the overall weight of the lithium battery during use;

[0032] The positive electrode sheet 103, the separator 104 and the negative electrode sheet 105 of the present utility model are designed in a wound structure, which can effectively increase the contact area between the sheets. By increasing the contact area, the overall capacity of the battery can be effectively improved. Lithium manganate is provided on both the front and back of the positive electrode sheet 103. By improving the material of the positive electrode sheet 103, the battery capacity and cycle life can be further improved. The double-sided lithium manganate structure design can eliminate the outer lithium battery structure layer, thereby reducing the occupancy rate of the internal space of the battery. The increased space can be used to add an electric layer structure, and thus the use characteristics of improving the battery capacity can also be achieved, having the use effects and characteristics of a large capacity.

[0033] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. Large-capacity cylindrical soft-pack lithium battery, including a lithium battery body (1), characterized in that, An external heat-conducting sleeve (2) is fixedly sleeved outside the lithium battery body (1), a graphite heat-conducting sheet (3) is wrapped inside the external heat-conducting sleeve (2), the graphite heat-conducting sheet (3) is designed in a surrounding coiled structure, a battery cell is arranged inside the lithium battery body (1), a positive electrode sheet (103) is wrapped and wound outside the battery cell, a separator film (104) is wrapped and wound outside the positive electrode sheet (103), a negative electrode sheet (105) is wrapped and wound outside one side of the separator film (104) away from the positive electrode sheet (103), and lithium manganate is arranged on both the front and back surfaces of the positive electrode sheet (103).

2. The large-capacity cylindrical soft-pack lithium battery according to claim 1, wherein: A positive electrode end part (101) is fixedly installed on the upper surface of the top end of the lithium battery body (1).

3. The large-capacity cylindrical soft-pack lithium battery according to claim 1, wherein: A negative electrode end part (102) is fixedly installed on the outer surface of the bottom end of the lithium battery body (1).

4. The large-capacity cylindrical soft-pack lithium battery according to claim 1, wherein: The negative electrode sheet (105) is arranged in a carbon layer structure.

5. The large-capacity cylindrical soft-pack lithium battery according to claim 1, wherein: The outer shell of the lithium battery body (1) is made of PVE material.

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