184results about How to "Improve load characteristics" patented technology

A wound electrode group includes an electrode stack that is formed by laminating a strip of positive electrode plate, a strip of negative electrode plate, and a pair of separators interposed therebetween. When the electrode stack is wound, a difference L in length between an inner turn and an adjacent outer turn satisfies L=2tπ+(W×k), where t is a thickness of the electrode stack, W is a maximum diameter of a cross section of the wound electrode group, and k is a coefficient that is preset in accordance with expansion coefficients of active materials of the positive and negative electrode plates and is within a range from 0.005 to 0.05.

The present application provides a nonaqueous electrolyte secondary battery which includes a cathode having a cathode active material layer, an anode, and a nonaqueous electrolyte, wherein the cathode active material layer includes secondary particles of a lithium phosphate compound having olivine structure, an average particle diameter A of primary particles constituting the secondary particles is 50 nm or more and 500 nm or less, and a ratio B / A of a pore diameter B of the secondary particles to the average particle diameter A of the primary particles is 0.10 or more and 0.90 or less, preferred 0.10 or more and 0.75 or less.

The invention relates to a wireless electromobile charge and discharge system and an operation method thereof, and belongs to electromobile charge and discharge systems. The charge and discharge system comprises a wireless power supply part, a wireless charging pile part and a vehicle-mounted part. The power supply part is mounted underground, and comprises a wireless power supply module and a power supply control module, wherein the wireless power supply module is used for converting electric energy of the electrical network and wirelessly transmitting the electric energy, and the output end of the power supply control module is connected with the wireless power supply module. The wireless charging pile part mainly comprises a wireless electric energy transmitting and receiving relay module and an energy storage module, wherein the wireless electric energy transmitting and receiving relay module is used for relaying the electric energy, and the energy storage module is used for storing electric energy back fed by an electromobile and the electric energy of the electrical network. The vehicle-mounted part mainly comprises an electromagnetic energy transmitting and receiving module which is used for collecting electromagnetic energy and transmitting the electromagnetic energy to a vehicle-mounted battery via a charger. The charging pile part and the vehicle-mounted part respectively include wireless transmitting and receiving modules which are used for wireless data interaction between the charging pile part and the vehicle-mounted part. The wireless electromobile charge and discharge system has the advantages that wireless transmission of electric energy and data as well as reutilization of residual energy of electromobile are realized, the wireless charging pile is flexible to move, and wireless charging has a strong adaptability to outdoor environments.

A vehicle bumper includes a bumper beam, a bumper face and an energy-absorbing member provided between the bumper beam and the bumper face. The energy-absorbing member has an L-shaped cross-section and includes a head of a front upper portion protruding upward. A space is formed between the bumper beam and the head. When a collision load acts on the bumper face, the head is deformed toward the space, thus absorbing the impact energy.

The invention provides a nonaqueous secondary battery separator which has a porous substrate, and, provided on one or both surfaces of the porous substrate, an adhesive porous layer which contains a polyvinylidene fluoride resin (A) and a polyvinylidene fluoride resin (B) described below. Polyvinylidene fluoride resin (A): the polyvinylidene fluoride resin contains vinylidene fluoride-derived structural units and hexafluoropropylene-derived structural units, wherein the ratio of hexafluoropropylene-derived structural units to all structural units is 0.5-1.5 mol%. Polyvinylidene fluoride resin (B): the polyvinylidene fluoride resin contains vinylidene fluoride-derived structural units and hexafluoropropylene-derived structural units, wherein the ratio of hexafluoropropylene-derived structural units to all structural units is greater than 1.5 mol%.