CATL Patente

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Embodiments of the present application provide a separator, a preparation method thereof, a secondary battery, and an electric apparatus. The separator includes a first base film, a coating, and a second base film, where the coating is disposed between the first base film and the second base film, the coating includes an ion-trapping agent, and a reduction potential of the ion-trapping agent relative to lithium metal is 0 V to 2 V. A secondary battery containing the separator exhibits improved cycling performance.

The present application discloses a charging and discharging circuit, a battery control circuit and an electrical device. The charging and discharging circuit includes: a power supply module, a first driving assembly, a second driving assembly and a first switch; the power supply module includes a battery, the first driving assembly includes a first motor, and the second driving assembly includes a second motor; the first driving assembly and the second driving assembly are connected in parallel between a positive electrode end and a negative electrode end of the power supply module; and one end of the first switch is connected to a neutral point of the first motor, and the other end of the first switch is connected to a neutral point of the second motor. According to the present application, the first switch is connected between the neutral points of the two motors, different circuit loops are formed by switching by controlling on and off of each switch in the circuit, so that more functions can be supported and achieved. A plurality of inductors can be connected between the neutral points of the two motors in series, and the inductors can be connected in parallel with the switches, so that the inductance in the charging and discharging loop can be flexibly adjusted, and different battery heating requirements are met by adjusting the circuit structure.

The present application discloses a battery main box, a charge-discharge circuit, and a powered device. The battery main box includes two first electrode circuits and one second electrode circuit. A switch is connected between the two first electrode circuits. The two first electrode circuits are respectively configured to be connected to two powered loads and two batteries, and the second electrode circuit is configured to be respectively connected to the two powered loads and the two batteries. The battery main box in the embodiments of the present application includes the two first electrode circuits and the one second electrode circuit, and the switch is connected between the two first electrode circuits. By controlling the switch to be on or off, the circuit structure in which the batteries are located is changed, so that the circuit structure can be flexibly changed to implement more functions.

This application discloses a charge-discharge circuit and an electric device. The charge-discharge circuit includes a power supply module, a first drive assembly, a second drive assembly, and a first switch module, where the first drive assembly and the second drive assembly are connected in parallel between a positive terminal and a negative terminal of the power supply module; and a terminal of the first switch module is connected to the first drive assembly, and another terminal of the first switch module is connected to the second drive assembly. The charge-discharge circuit provided by an embodiment of this application includes a first switch module, where a terminal of the first switch module is connected to the first drive assembly, and another terminal of the first switch module is connected to the second drive assembly, thereby enabling flexible changes in the circuit structure to achieve more functions by controlling the first switch module to switch a connection relationship between the first drive assembly and the second drive assembly.

A drain valve (13), a battery (100), and an electric device are provided, pertaining to the field of battery technology. The drain valve includes a valve body (131), a valve core (132), a gas-generating substance (133), and a check member (135). The valve body has a liquid inlet (1311) and a liquid outlet (1312). The valve core movably fits with the valve body to close the liquid outlet. The gas-generating substance is at least partially disposed within the valve body, and the gas-generating substance is configured to react with liquid water to generate a gas so as to push the valve core to open the liquid outlet. The check member is configured to allow the liquid water to enter the valve body from the liquid inlet and restrict gas from flowing out of the valve body through the liquid inlet. The gas-generating substance reacts with the liquid water to produce the gas, and the check member restricts the gas from flowing out of the valve body through the liquid inlet. As the gas increases, the pressure inside the valve body gradually increases, thereby pushing the valve core to move and open the liquid outlet, and allowing the liquid water to be discharged from the battery through the liquid outlet. This reduces the risk of leaked liquid water inside the battery causing a short circuit in a battery cell, which otherwise leads to an increase in the temperature of the battery and thus causes a fire in the battery, thereby improving the reliability of the battery during use.

The present application provides a non-aqueous electrolyte solution for a secondary battery, a secondary battery, and an electrical apparatus. The non-aqueous electrolyte solution for a secondary battery of the present application comprises an additive and a non-aqueous solvent, the non-aqueous solvent comprises dimethyl carbonate, and the additive comprises a cyclic sulfate compound as represented by formula (I); <img class="EMIRef" id="3622919c-d914-465f-9be8-87548af03a27-ia01" />

The present application discloses a lithium secondary battery and an electrical apparatus. The lithium secondary battery includes a positive electrode plate and an electrolyte solution, where the positive electrode plate includes a positive electrode active material layer containing a positive electrode active material, and the positive electrode active material includes at least one doping element selected from aluminum, zirconium, boron, magnesium, zinc, calcium and titanium; the electrolyte solution includes a silane-based first additive containing C2-C8 alkenyl and a second additive, and the second additive is selected from at least one of lithium fluorosulfonate, lithium bis(fluorosulfonyl)imide and lithium tetrafluoroborate; and the ratio of the mass percentage content W1 of the first additive in the electrolyte solution to the mass percentage content W2 of the second additive in the electrolyte solution to the mass percentage content W3 of the doping element in the positive electrode active material satisfies 1:(0.2-2):(0.1-0.5). The lithium secondary battery of the present application has good cycling performance, kinetic performance and storage life.

Disclosed in the present application are a charge and discharge control method and apparatus, and a device, a storage medium and a program product. The method comprises: when a battery heating condition is satisfied, turning on a connecting circuit between a neutral point of a first electric motor and a neutral point of a second electric motor, wherein a first electric motor controller connected to the first electric motor and a second electric motor controller connected to the second electric motor are both connected between a positive electrode and a negative electrode of a battery; and controlling the turning-on/turning-off of bridge arms in the first electric motor controller and the second electric motor controller, and forming, in a circuit in which the battery is located, a charging loop and a discharging loop which are alternately switched. In the present application, the total inductance of windings in an access loop can increase, such that the electric quantity storage capability is improved, which is conducive to the improvement of the battery heating efficiency. A freewheel loop is added following a discharge loop, such that the peak current is reduced, the electric motor noise is reduced, and the overcurrent damage of a device is reduced. In a solution where all windings of the same electric motor have the same current direction, rotor heating situations can be reduced.

Embodiments of the present application provide a charge-discharge circuit, a method, a computing device, and a storage medium thereof, where a regulation switch module is connected between a first energy storage element and a second switch module, utilizing an alternating current generated by a charge-discharge loop between a drive motor and a battery to achieve battery self-heating. The present application enables flexible adjustment of the charge-discharge loop between a power battery and an energy storage element. The present application particularly achieves battery heating in a dual-drive motor scenario, enabling flexible adjustment of the charge-discharge of dual-drive motors for battery self-heating solutions while reducing costs, to meet heating demands in various scenarios.

This disclosure provides a positive electrode active material, a preparation method thereof, a secondary battery, and an electric apparatus. The positive electrode active material is an agglomerate of primary particles. The positive electrode active material internally contains pores located between the primary particles, and the longest connected distance of the pores is not less than 0.5 µm, optionally 1 µm to 5 µm. The positive electrode active material provided by this disclosure can provide expansion space for the anisotropic volume changes of the primary particles inside the positive electrode active material during cycling, thereby extending the cycle life of a battery. In addition, the interconnected pores are conducive to shortening a transmission path for metal ions (such as lithium ions) within the positive electrode active material, facilitating the deintercalation and intercalation of the metal ions, and further enhancing the kinetic performance of the battery and facilitating the capacity utilization of the battery.

The present application discloses a composite electrode, a solar cell, methods for preparing the same, a power consuming apparatus, and an energy storage apparatus. The composite electrode includes a conductive oxide substrate and a metal doped in the conductive oxide substrate. The composite electrode has good stability performance, and also functions as a matrix to protect the doped metal, thereby improving chemical stability of the metal. The doped metal modifies the conductive oxide substrate, thereby significantly improving electrical conductivity of the composite electrode. A back electrode of the solar cell includes the composite electrode. The photoelectric performance of the solar cell is enhanced and remains stable.

A secondary battery (5) and a manufacturing method therefor, and an electric device (6). The secondary battery (5) comprises a positive electrode sheet and a negative electrode sheet. The negative electrode sheet comprises a negative electrode active material layer. The negative electrode active material layer comprises a negative electrode active substance. The negative electrode active substance comprises a silicon-based material. In the same charging and discharging cycle process, the volume ratio of the negative electrode sheet during charging and discharging of the secondary battery (5) is R, wherein R is less than or equal to 1.5; and the volume ratio of the positive electrode sheet during charging and discharging of the secondary battery (5) is Y, wherein Y is less than or equal to 0.98.

The present application provides a secondary battery and an electrical apparatus. The secondary battery of the present application includes a negative electrode plate and a non-aqueous electrolyte solution. The negative electrode plate includes a negative electrode active material. The volume average particle size Dv50 of the negative electrode active material is 6-20 µm. The non-aqueous electrolyte solution includes an additive and a non-aqueous solvent. The additive includes a cyclic sulfate compound represented by Formula (I). The non-aqueous solvent includes ethylene carbonate. <img class="EMIRef" id="15823166-02d2-464f-9244-04eac718cdf4-ia01" />

Provided in the present application are a non-aqueous electrolyte solution for a secondary battery, a secondary battery, and an electrical apparatus. The non-aqueous electrolyte solution for a secondary battery of the present application comprises an additive and a non-aqueous solvent, wherein the non-aqueous solvent comprises a first solvent; the additive comprises a cyclic sulfate compound as shown in formula (I); and the first solvent is selected from one or more of ethylene glycol dimethyl ether, a compound as shown in formula A, and a compound as shown in formula B;

The present application discloses an electrolyte solution for a lithium secondary battery, a secondary battery, and an electrical device. The electrolyte solution for a lithium secondary battery includes a sulfate and fluorosulfonate ions, and a molar ratio of the sulfate to the fluorosulfonate ions is (8-223):1.

The present application provides a secondary battery and an electrical apparatus. The secondary battery of the present application comprises an electrolyte solution; the electrolyte solution comprises a solvent and an additive; the solvent comprises ethylene carbonate; the additive comprises 1,3-propane sultone and fluoroethylene carbonate; the percentage mass content of the ethylene carbonate in the electrolyte solution is x%, the percentage mass content of the 1,3-propane sultone in the electrolyte solution is y%, and the percentage mass content of the fluoroethylene carbonate in the electrolyte solution is z%; and the x, the y, and the z satisfy: 10≤x/y≤950 and 2≤x/z≤10.

Embodiments of the present application provide a non-aqueous electrolyte, a secondary battery and an electric device. The non-aqueous electrolyte comprises additives; the additives comprise a first additive and a second additive; the first additive is any one or more cyclic sulfate compounds having a structure represented by general formula (I); the second additive is an organic base additive; the organic base additive comprises any one or more of groups consisting of 5-12 membered aromatic heterocyclic organic bases or 5-12 membered aliphatic heterocyclic organic bases; ring structures in the 5-12 membered aromatic heterocyclic organic bases and the 5-12 membered aliphatic heterocyclic organic bases contain nitrogen atoms. <img class="EMIRef" id="4b3b0548-75ff-478e-98b5-d99624c6ebcf-ia01" />

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