CN207009591U - A large-capacity winding lithium battery - Google Patents

Abstract

The utility model discloses a large capacity coiling type lithium cell, including first casing, first casing is hollow structure, the top of first casing is equipped with first through-hole and second through-hole, first through-hole and second through-hole all with the inside intercommunication of first casing, and fixed mounting has the negative pole ear in the first through-hole, and fixed mounting has positive ear in the second through-hole. In the utility model, the positive plate and the negative plate can generate electric energy by reacting in the non-aqueous electrolyte solution, and the electric energy can be output to the outside through the positive lug and the negative lug; the insulating radiating fins can radiate the overhigh heat inside the battery to the outside, so that the service life of the battery is prolonged; the isolating film isolates the positive plate from the negative plate, so that the direct contact of the positive plate and the negative plate is prevented, and the internal short circuit of the battery is further avoided; the negative plate, the positive plate and the isolating film adopt a structure which is sequentially surrounded, so that the contact area of the positive plate and the negative plate with the non-aqueous electrolyte solution is greatly increased, and the working efficiency of the battery is further greatly increased.

Description

A large-capacity winding lithium battery

technical field

The utility model relates to the technical field of lithium batteries, in particular to a large-capacity wound lithium battery.

Background technique

At present, the most used batteries are winding batteries and lithium batteries. Lithium batteries are a type of batteries that use lithium metal or lithium alloy as the negative electrode material and use non-aqueous electrolyte solution. A winding battery is a battery composed of battery cells formed in a winding manner. Compared with lithium batteries, winding batteries have super high-rate discharge capacity, good working ability under partial charge state, no free electrolyte, can be placed in any direction, strong structure and strong shock resistance, Widely used in vehicle starting, automotive emergency power supply, generator starting, hybrid electric vehicles, and solar energy storage. Therefore, the research on winding batteries has always been a hot topic for scientists.

However, the existing wound battery does not have a heat dissipation structure, so the wound battery is easily damaged due to high temperature during use, which affects the working life. Therefore, the utility model proposes a large-capacity winding lithium battery with a heat dissipation structure to solve the above problems.

Utility model content

The purpose of the utility model is to solve the shortcomings in the prior art, and propose a large-capacity winding lithium battery.

In order to achieve the above object, the utility model adopts the following technical solutions:

A large-capacity winding lithium battery, comprising a first casing, the first casing is a hollow structure, the top of the first casing is provided with a first through hole and a second through hole, the first through hole and the second through hole communicate with the inside of the first housing, and a negative tab is fixedly installed in the first through hole, a positive tab is fixedly installed in the second through hole, and one end of the positive tab is connected to the positive tab. The negative tab is connected to one end of the negative electrode sheet, a separator is provided between the negative electrode sheet and the positive electrode sheet, and a second casing located inside the first casing is provided below the top inner wall of the first casing, and the second The housing is located between the positive tab and the negative tab, the second housing is provided with a heat dissipation through hole, the top inner wall of the first housing is provided with a third through hole, and the third through hole communicates with the heat dissipation through hole , the surrounding of the second housing is provided with insulating fins distributed equidistantly, one end of the insulating fins is located in the first housing, and the other end of the insulating fins is located in the heat dissipation through hole.

Preferably, the negative electrode sheet, the positive electrode sheet and the separator are alternately wound around the second casing in sequence.

Preferably, a non-aqueous electrolyte is installed inside the first casing.

Preferably, the height of the second casing is smaller than that of the first casing.

Preferably, the negative electrode sheet and the positive electrode sheet have the same thickness.

Preferably, the position where the first through hole is in contact with the negative tab and the position where the second through hole is in contact with the positive tab are both provided with sealing materials, and the length of the heat dissipation through hole is shorter than the length of the second casing.

In the utility model, the positive electrode sheet and the negative electrode sheet react in the non-aqueous electrolyte solution to generate electric energy, and the electric energy can be output to the outside through the positive electrode ear and the negative electrode ear; Extend the service life of the battery; the heat dissipation through holes help the battery to be fixed, and it is very convenient to use; the separator separates the positive electrode from the negative electrode, preventing the direct contact between the positive electrode and the negative electrode, thereby avoiding the internal short circuit of the battery; the negative electrode, the positive electrode The sheet and the separator adopt a sequentially encircling structure, which greatly increases the contact area between the positive and negative electrode sheets and the non-aqueous electrolyte solution, thereby greatly increasing the working efficiency of the battery.

Description of drawings

Fig. 1 is a structural schematic diagram of a large-capacity winding lithium battery proposed by the utility model;

Fig. 2 is a top view structural diagram of a large-capacity winding lithium battery proposed by the present invention.

In the figure: 1 first casing, 2 negative electrode sheet, 3 positive electrode sheet, 4 positive electrode lug, 5 negative electrode lug, 6 isolation film, 7 second casing, 8 heat dissipation through hole, 9 insulating heat sink.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example.

Referring to Figures 1-2, a large-capacity winding lithium battery includes a first case 1, the first case 1 is a hollow structure, and the top of the first case 1 is provided with a first through hole and a second through hole , both the first through hole and the second through hole communicate with the inside of the first housing 1, and the negative pole ear 5 is fixedly installed in the first through hole, the positive pole ear 4 is fixedly installed in the second through hole, and the positive pole ear 4 is connected with One end of the positive pole piece 3, one end of the negative pole piece 2 is connected to the negative pole tab 5, a separator 6 is provided between the negative pole piece 2 and the positive pole piece 3, and a diaphragm 6 is provided under the top inner wall of the first housing 1 inside the first housing 1. The second housing 7 is located between the positive tab 4 and the negative tab 5, the second housing 7 is provided with a heat dissipation through hole 8, and the top inner wall of the first housing 1 is provided with a third through hole. holes, the third through hole communicates with the heat dissipation through hole 8, and the second housing 7 is provided with insulating fins 9 equidistantly distributed around, one end of the insulating fins 9 is located in the first housing 1, and the insulating fins The other end of 9 is located in the heat dissipation through hole 8, and the negative electrode sheet 2, the positive electrode sheet 3 and the separator 6 are alternately surrounded by the second casing 7 in sequence. The interior of the first casing 1 is equipped with a non-aqueous electrolyte, and the second casing The height of the body 7 is smaller than the height of the first casing 1, the thickness of the negative electrode sheet 2 and the positive electrode sheet 3 are the same, the position where the first through hole contacts the negative electrode tab 5 and the position where the second through hole contacts the positive electrode tab 4 is provided with a closed material, and the length of the heat dissipation through hole 8 is less than the length of the second housing 7 .

Working principle: the positive electrode sheet 3 and the negative electrode sheet 2 react in the non-aqueous electrolyte solution to generate electric energy, and the electric energy can be output to the outside through the positive electrode tab 4 and the negative electrode tab 5 . Because one end of the insulating heat sink 9 is located in the first housing 1, and the other end of the insulating heat sink 9 is located in the heat dissipation through hole 8, when the internal temperature of the battery is too high, the excessive heat can be dissipated by the insulating heat sink 9. Dissipates to the outside, thereby prolonging the battery life. Since the heat dissipation through hole 8 is provided in the battery, the battery can be fixed to the corresponding tool through the heat dissipation through hole 8, which is very convenient to use. The separator 6 separates the positive electrode sheet 3 from the negative electrode sheet 2, preventing direct contact between the positive electrode sheet 3 and the negative electrode sheet 2, thereby avoiding internal short circuit of the battery.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. Any equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (6)

1. A large-capacity winding lithium battery, comprising a first casing (1), characterized in that, the first casing (1) is a hollow structure, and the top of the first casing (1) is provided with There are a first through hole and a second through hole, the first through hole and the second through hole are connected with the inside of the first casing (1), and the negative pole ear (5) is fixedly installed in the first through hole, and the second through hole A positive pole ear (4) is fixedly installed in the hole, and the positive pole ear (4) is connected with one end of the positive pole sheet (3), and the negative pole ear (5) is connected with one end of the negative pole piece (2), and the negative pole piece ( 2) A separator (6) is provided between the positive electrode sheet (3), and a second housing (7) located inside the first housing (1) is provided below the top inner wall of the first housing (1) , and the second housing (7) is located between the positive tab (4) and the negative tab (5), the second housing (7) is provided with heat dissipation through holes (8), the first housing ( 1) The top inner wall is provided with a third through hole, the third through hole communicates with the heat dissipation through hole (8), and the second housing (7) is provided with insulating fins (9) distributed equidistantly around, One end of the insulating heat sink (9) is located in the first casing (1), and the other end of the insulating heat sink (9) is located in the heat dissipation through hole (8). 2. A large-capacity winding lithium battery according to claim 1, characterized in that, the negative electrode sheet (2), the positive electrode sheet (3) and the separator (6) are successively wound around the second electrode sheet. Around the housing (7). 3. A large-capacity winding lithium battery according to claim 1, characterized in that, the first casing (1) is filled with a non-aqueous electrolyte. 4. A large-capacity winding lithium battery according to claim 1, characterized in that the height of the second casing (7) is smaller than the height of the first casing (1). 5. A large-capacity winding lithium battery according to claim 1, characterized in that the negative electrode sheet (2) and the positive electrode sheet (3) have the same thickness. 6. A large-capacity winding lithium battery according to claim 1, characterized in that the position where the first through hole is in contact with the negative tab (5) and the second through hole is in contact with the positive tab (4) All positions are provided with sealing materials, and the length of the heat dissipation through hole (8) is shorter than the length of the second casing (7).