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177results about How to "Increased polarization" patented technology

Battery heating circuits and methods with resonance components in series using voltage inversion based on predetermined conditions

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit (1), a switching control module (100), a damping component R1, an energy storage circuit, and an energy superposition unit, the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit (1), the current storage component L1, and the charge storage component C1 are connected in series; the switching control module (100) is connected with the switch unit (1), and is configured to control ON/OFF of the switch unit (1), so as to control the energy flowing between the battery and the energy storage circuit; the energy superposition unit is connected with the energy storage circuit, and is configured to superpose the energy in the energy storage circuit with the energy in the battery when the switch unit (1) switches on and then switches off; the switching control module (100) is also configured to control the switch unit (1) to switch off after the first positive half cycle of current flow through the switch unit (1) after the switch unit (1) switches on, and the voltage applied to the switch unit (1) at the time the switch unit (1) switches off is lower than the voltage rating of the switch unit (1).
Owner:BYD SEMICON CO LTD

Lithium ion battery diaphragm and preparation method thereof

The invention relates to a lithium ion battery diaphragm. The lithium ion battery diaphragm comprises a polyolefin substrate and a composite coating, wherein the coating is connected with the polyolefin substrate through a binder, the coating is formed by stacking a plurality of inorganic particle layers, and each two adjacent inorganic particle layers of the coating are connected with each other through a binder; each inorganic particle layer consists of flaky inorganic particles, and the flaky inorganic particles are distributed in parallel or at a small angle in the coating. The invention also relates to a preparation method of the lithium ion battery diaphragm. The preparation method comprises the following steps: preparing flaky inorganic particles; screening first inorganic particles and second inorganic particles; preparing coating slurry; coating the polyolefin substrate with the coating slurry, and drying the polyolefin substrate with the coating to obtain a product. The lithium ion battery diaphragm is high in flatness, low in coarseness, low in water absorption rate, low inn coating expansion degree, capable of effectively reducing the natural crimpness of single-side coated diaphragm and capable of improving the assembling efficiency and rate of finished products of a laminated battery.
Owner:河南惠强新能源材料科技股份有限公司
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