Single battery being capable of resisting overloading and high-spinning and being high in capacity

Abstract

The invention provides a single battery being capable of resisting overloading and high-spinning and being high in capacity. A preparation method includes the steps of: successively tightly laminatinga nickel square-mesh net, a graphite sheet, positive powder, insulation powder, a negative pole sheet and a current collector; surrounding and compacting the outer rings of the insulation powder andthe negative pole sheet by a current blocking ring which is produced by mixing and pulping MgO and asbestos according to mass ratio of 2:1 and punching the mixture into a ring; the insulation powder is a mixture of LiCl-LiBr-LiF ternary eutectic substance and MgO according to the mass ratio of 1:1-1:1.5, wherein the mixture is compressed to form an insulation layer being 0.4-0.6 mm in thickness; the positive powder is a CoS2 / FeS2 mixture according to the mass ratio of 1:1, wherein the positive powder also contains insulation powder accounting for 15-18% by mass of the positive powder and lithium oxide accounting for 2-5% by mass of the positive powder. The single battery has strong anti-severe environment capability, can output stable voltage and is high in specific energy, and also satisfies the demand of resisting overloading and high-spinning and being long in service life.

Description

technical field [0001] The invention belongs to the technical field of pyrotechnics and weapon system power supplies, and relates to a thermal battery for pyrotechnics. Background technique [0002] At present, the thermal battery needs to be able to withstand an overload of 8000-13000g, withstand a rotation of 40-100rps, and need to work for a long time, which requires high mechanical resistance and capacity of the thermal battery. [0003] In the past, the main design of thermal batteries in terms of high overload resistance and high rotation resistance was to add choke rings to the three powder materials that make up the single battery, but this structure has the following disadvantages: [0004] 1. When the thermal battery is working, the internal temperature exceeds 500°C. When the internal heating of the thermal battery is instantaneous, part of the positive active material is decomposed by heat, resulting in a decrease in the utilization rate of the positive active ma...

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Problems solved by technology

[0004] 1. When the thermal battery is working, the internal temperature exceeds 500°C. When the internal heating of the thermal battery is instantaneous, part of the positive electrode active material is heated and decomposed, resulting in a decrease in the utilization rate of the positive electrode active material, thereby restricting the capacity of the thermal battery, and the working time of the thermal battery will be shortened.

[0005] 2. The proportion of the eutectic in the separator powder and the flow inhibitor has a great influence on the internal resistance of the thermal battery during the working process, affecting the working time and reliability of the thermal battery. When the proportion of the flow inhibitor in the separator powder is small, the thermal The internal resistance of the battery is relatively small when it is working, but it is easy to flow at high temperature, especially under the action of high overload and high spin, the electrolyte is easy to overflow from the choke ring, and the hot battery stack is prone to short circuit, resulting in voltage instability and even some Security risks

[0006] 3. The single battery mainly includes three layers of negative electrode, separator powder, and positive electrode powder. When the stack is assembled, the current collector, single battery, and heating sheet are assembled in layers in a certain order. The current collector is located between the iron heating sheet and the negative electrode. , due to the thin thickness of the current collector, only 0.05mm, it can only be counted manually before assembly, and it cannot be inspected with the naked eye after being installed in the stack, and there is a possibility of assembly errors

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