A lithium battery of silicon-carbon composite negative electrode

Abstract

The utility model discloses a kind of lithium batteries of silicon-carbon composite negative electrode, including battery main body, connecting wire and auxiliary heat sink;The utility model is equipped with auxiliary heat sink by being outside battery main body, when using, battery main body can be lifted from mounting surface by the aid of pad foot, avoid battery main body back to be tightly attached to mounting surface and cause local high temperature to cause malfunction, by being set in the inside of clamp, heat sink is attached in the front of battery main body by graphene gasket, by the aid of heat sink and radiating fin, battery main body surface heat can be efficiently radiated to air, to improve the heat dissipation effect of battery main body, to meet the heat dissipation demand of silicon-carbon composite negative electrode lithium battery.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a lithium battery with a silicon-carbon composite negative electrode. Background Technology

[0002] Silicon-carbon composite negative electrode lithium battery is a lithium-ion battery that uses silicon-carbon composite material as the negative electrode. Compared with traditional graphite negative electrode lithium battery, silicon-carbon composite negative electrode lithium battery significantly improves the energy density of the battery, allowing the battery to store more electricity in the same volume or weight, with lower internal resistance, maintaining battery structure and chemical stability, and extending cycle life.

[0003] Existing patent application number: 201920251865.3 A novel silicon-carbon composite negative electrode lithium battery, wherein a nylon layer is disposed on the outside of the lithium battery body, a first adhesive coating is disposed inside the nylon layer, an aluminum foil is disposed inside the first adhesive coating, a conversion film layer is disposed inside the aluminum foil, a second adhesive coating is disposed inside the conversion film layer, a polyolefin layer is disposed inside the second adhesive coating, and a battery cell is disposed inside the polyolefin layer.

[0004] The aforementioned patent describes a silicon-carbon composite negative electrode lithium battery. The silicon-carbon composite negative electrode lithium battery supports higher charging and discharging rates, but the heat generation problem caused by the high charging and discharging power is becoming more and more obvious. The battery body is usually equipped with some simple heat dissipation structures (such as silicone grease patches), which are increasingly unable to meet the heat dissipation requirements of the battery. Therefore, it is necessary to improve the functional structure of the silicon-carbon composite negative electrode lithium battery. Utility Model Content

[0005] The purpose of this invention is to provide a lithium battery with a silicon-carbon composite negative electrode to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a lithium battery with a silicon-carbon composite negative electrode, comprising a battery body, connecting wires, and an auxiliary heat dissipation device. The connecting wires are connected to the top of the battery body, and the auxiliary heat dissipation device is sleeved on the outside of the battery body. The auxiliary heat dissipation device includes a jacket, a insertion groove, a screw hole, a mounting plate, a mounting hole, and a heat dissipation frame. The jacket is sleeved on the edge of the surface of the battery body. An insertion groove is formed on the bottom inner side of the jacket. A screw hole is formed on the lower front side of the jacket, and the screw hole communicates with the inside of the insertion groove. A mounting plate is horizontally arranged at the bottom of the battery body. The mounting plate is inserted into the inside of the insertion groove. A mounting hole is formed through the surface of the mounting plate. The screw hole and the mounting hole are locked and fixed by screws. A heat dissipation frame is welded to the front edge of the inner side wall of the jacket and is fitted to the front surface of the battery body.

[0007] Preferably, the jacket is made entirely of aluminum alloy.

[0008] Preferably, the back of the jacket is integrally provided with pads at the four corners, and the thickness of the pads is not less than 2mm.

[0009] Preferably, a graphene pad is laid on the back of the heat sink, and the graphene pad fills the space between the heat sink and the battery body.

[0010] Preferably, the heat sink is integrally provided with heat dissipation fins on the front side, and the heat dissipation fins are arranged at equal intervals on the front side of the heat sink.

[0011] Preferably, the heat sink and heat sink fins are made entirely of pure copper.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention features an auxiliary heat dissipation device fitted around the battery body. During use, the jacket, with the help of pads, can lift the battery body off the mounting surface, preventing the back of the battery body from being pressed tightly against the mounting surface, which would hinder heat dissipation and cause localized high temperatures that could lead to malfunctions. A heat dissipation frame is installed inside the jacket, which is attached to the front of the battery body via graphene pads. With the help of the heat dissipation frame and heat dissipation fins, the heat on the surface of the battery body can be efficiently dissipated into the air, thereby improving the heat dissipation effect of the battery body and meeting the heat dissipation requirements of silicon-carbon composite negative electrode lithium batteries. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the present utility model;

[0015] Figure 2 This is a front view structural diagram of the battery body in this utility model;

[0016] Figure 3 This is a front view schematic diagram of the jacket structure in this utility model;

[0017] Figure 4 This is a rear view schematic diagram of the jacket structure in this utility model;

[0018] Figure 5 This is a schematic diagram of the overall structure of the jacket in this utility model.

[0019] In the diagram: Battery body-1, connecting wire-2, auxiliary heat dissipation device-3, clip-31, pad-31a, plug slot-32, screw hole-33, mounting plate-34, mounting hole-35, heat sink-36, graphene pad-36a, heat dissipation fins-37. Detailed Implementation

[0020] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0021] Please see Figure 1 This utility model provides a lithium battery with a silicon-carbon composite negative electrode, including a battery body 1, a connecting wire 2 and an auxiliary heat dissipation device 3. The top of the battery body 1 is connected to the connecting wire 2, and the battery body 1 establishes an electrical connection with an electronic device through the connecting wire 2. The auxiliary heat dissipation device 3 is sleeved on the outside of the battery body 1.

[0022] Please see Figure 2-5 This utility model provides a lithium battery with a silicon-carbon composite negative electrode. The auxiliary heat dissipation device 3 includes a jacket 31, a insertion groove 32, a screw hole 33, a mounting plate 34, a mounting hole 35, and a heat dissipation bracket 36. The jacket 31 is sleeved on the edge of the surface of the battery body 1. The jacket 31 is made of aluminum alloy. Aluminum alloy has good thermal conductivity and light weight, so the jacket 31 does not easily hinder the surface heat dissipation of the battery body 1 and can control the overall weight to meet the requirements of lightweighting. The four corners of the back of the jacket 31 are integrally provided with pads 31a. The pads 31a are not less than 2mm thick. The pads 31a can lift the jacket 31 away from the mounting surface to avoid the back of the battery body 1 being in close contact with the mounting surface, which would cause heat to be difficult to dissipate and cause local high temperature and failure. The insertion groove 32 is opened on the bottom inner side of the jacket 31. The screw hole 33 is opened on the lower part of the front side of the jacket 31 and connects to the inside of the insertion groove 32. The mounting plate 34 is horizontally arranged at the bottom of the battery body 1. The mounting plate 34 is connected to the inside of the insertion groove 32. The mounting plate 34 is connected by an insertion joint. A mounting hole 35 is provided through the surface of the mounting plate 34. Screw holes 33 and mounting holes 35 are locked together with screws. A heat sink 36 is welded to the front edge of the inner wall of the sleeve 31. The heat sink 36 is fitted against the front surface of the battery body 1. A graphene pad 36a is laid on the back of the heat sink 36, filling the space between the heat sink 36 and the battery body 1. The graphene pad 36a has excellent thermal conductivity to improve the heat transfer efficiency between the heat sink 36 and the battery body 1. Heat sink fins 37 are integrally formed on the front of the heat sink 36. The heat sink fins 37 are equidistantly arranged on the front of the heat sink 36. The heat sink 36, with the help of the heat sink fins 37, can increase the contact area with the air to further improve the heat dissipation effect. The heat sink 36 and heat sink fins 37 are made of pure copper. Copper has excellent thermal conductivity, enabling the heat sink 36 and heat sink fins 37 to efficiently dissipate heat from the surface of the battery body 1 into the air, ensuring the heat dissipation effect.

[0023] Specifically, when installing the clip 31, the clip 31 is placed on the surface of the battery body 1 from bottom to top, and the mounting piece 34 is inserted into the insertion slot 32. Then, the screw is passed through the screw hole 33 and locked into the inside of the mounting hole 35, thereby completing the assembly of the clip 31 and the battery body 1. During use, the clip 31 can lift the battery body 1 away from the mounting surface with the help of the pad 31a, avoiding the back of the battery body 1 from being too close to the mounting surface, which would make it difficult to release heat and cause local high temperature and failure. By setting a heat sink 36 inside the clip 31, the heat sink 36 is attached to the front of the battery body 1 through the graphene pad 36a. With the help of the heat sink 36 and the heat sink fins 37, the heat on the surface of the battery body 1 can be efficiently dissipated into the air, thereby improving the heat dissipation effect of the battery body 1 and meeting the heat dissipation requirements of the silicon-carbon composite negative electrode lithium battery.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery with a silicon-carbon composite negative electrode, comprising a battery body (1) and a connecting wire (2), wherein the top of the battery body (1) is connected to the connecting wire (2). Its features are: It also includes an auxiliary heat dissipation device (3). The auxiliary heat dissipation device (3) is sleeved on the outside of the battery body (1). The auxiliary heat dissipation device (3) includes a sleeve (31), a plug groove (32), a screw hole (33), a mounting plate (34), a mounting hole (35), and a heat dissipation bracket (36). The sleeve (31) is sleeved on the edge of the surface of the battery body (1). The bottom surface of the inner side of the sleeve (31) has a plug groove (32). The lower part of the front side of the sleeve (31) has a screw hole (33). The wire hole (33) is connected to the inside of the insertion slot (32). The bottom of the battery body (1) is horizontally provided with an mounting plate (34). The mounting plate (34) is inserted into the inside of the insertion slot (32). The surface of the mounting plate (34) is provided with a mounting hole (35). The screw hole (33) and the mounting hole (35) are locked and fixed with screws. The front edge of the inner wall of the sleeve (31) is welded with a heat sink (36). The heat sink (36) is attached to the front surface of the battery body (1).

2. The lithium battery with a silicon-carbon composite negative electrode according to claim 1, characterized in that: The jacket (31) is made of aluminum alloy.

3. A lithium battery with a silicon-carbon composite negative electrode according to claim 1, characterized in that: The back of the sleeve (31) is integrally provided with pads (31a) at the four corners, and the thickness of the pads (31a) is not less than 2mm.

4. A lithium battery with a silicon-carbon composite negative electrode according to claim 1, characterized in that: The back of the heat sink (36) is covered with a graphene pad (36a), which fills the space between the heat sink (36) and the battery body (1).

5. A lithium battery with a silicon-carbon composite negative electrode according to claim 1, characterized in that: The heat sink (36) has heat sink fins (37) integrally provided on the front side, and the heat sink fins (37) are arranged at equal intervals on the front side of the heat sink (36).

6. A lithium battery with a silicon-carbon composite negative electrode according to claim 5, characterized in that: The heat sink (36) and heat sink fins (37) are made of pure copper.

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