CATL

This application discloses an energy storage practical training teaching aid. The energy storage practical training teaching aid includes an energy storage device, a control device, and a test panel; where the energy storage device includes a plurality of battery packs, each battery pack including a plurality of simulated battery cells connected in series; the test panel includes a measurement terminal unit, where the measurement terminal unit and the control device are both electrically connected to each simulated battery cell, and the measurement terminal unit is connected in parallel with the control device; the measurement terminal unit is configured to connect to an external measurement device to collect electrical parameters between two target simulated battery cells connected to the external measurement device; and the control device is configured to control one or more target simulated battery cells in the energy storage device to output a target required voltage in a simulated manner. The control device is used to perform voltage simulation on the simulated battery cells in the energy storage device, thereby simulating the voltage output of physical battery cells. In this way, the maintenance cost of the energy storage practical training teaching aid is reduced and the safety and service life of the energy storage practical training teaching aid are improved.

A battery trigger device belonging to the field of battery technology is provided. The battery trigger device includes: an input device and a message generation device; the message generation device includes a wireless communication module and a control module; the wireless communication module is wirelessly connected to the input device; the wireless communication module is configured to acquire target data sent by the input device; the control module is connected to the wireless communication module; the control module is provided with a wired communication interface for connecting to a management device of a target battery apparatus; the control module is configured to generate a target signal based on the target data and output the target signal to the management device; and the target signal is used to trigger the target battery apparatus to output electrical energy.

This application provides an electrolyte for lithium-ion secondary battery and a battery. The electrolyte includes a solvent, an additive composition, and a lithium salt. The additive composition includes a compound of formula I and at least one of compounds of formula II and formula III. The resulting battery has a high voltage and exhibits good cycling performance and storage performance at high temperature. <img class="EMIRef" id="4c42c2a9-2876-4caa-84d2-2032ba1e3e8f-ia01" /> In the formulas, the symbols are as defined in the specification.

Provided in the present application is a modified high-nickel ternary positive electrode material, containing a core, an inner coating layer and an outer coating layer. The core contains a high-nickel ternary positive electrode material matrix, which is doped with M1, M2 and W, wherein M1 is one of Mo, Zr, Ti, Sb, Nb and Te; and M2 is one of Mg, Al, Ca, Zn and Sr. The chemical formula of the high-nickel ternary positive electrode material matrix doped with M1, M2 and W is Li<1+a>[Ni<x>Co<y>Mn<z>M1<b>M2<c>W<d>]O<2>, wherein 0.65 ≤ x < 1; 0 ≤ y < 0.3; 0 ≤ z < 0.3; 0 < a < 0.2; 0< b < 0.1; 0 < c < 0.1; 0 < d < 0.1; x + y + z + b + c + d = 1; and optionally, 0.8 ≤ x < 1. The surface layer of the core is further doped with Co. The inner coating layer is a Co-containing compound, and the outer coating layer is an Al-containing compound and a B-containing compound. The present application also relates to a method for preparing a modified high-nickel ternary positive electrode material, and a secondary battery, a battery module, a battery pack and a power-consuming apparatus.

This application provides an electrode assembly and a manufacturing method thereof, a battery cell, a battery, and an electric apparatus. The electrode assembly includes a first electrode plate, and separators provided on two sides of the first electrode plate in a thickness direction of the electrode plate and stacked with the first electrode plate; where in an unfolded state of the electrode assembly, the separator has first edge portions each exceeding an end of the first electrode plate in a length direction of the separator, and the separator has second edge portions each exceeding an end of the first electrode plate in a height direction of the separator; and in the thickness direction of the electrode plate, the corresponding first edge portions on two sides of the first electrode plate are at least partly hot-melt connected to form first hot-melted segments, and the corresponding second edge portions on two sides of the first electrode plate are at least partly hot-melt connected to form second hot-melted segments. The technical solution in this application can enhance the electrochemical performance of batteries and improve the safety and reliability of batteries.

The embodiments of this disclosure provide an electrode assembly and manufacturing method and device, battery cell, battery, electric device, the electrode assembly is used for a battery cell (100) and includes: a first electrode sheet (1) and a second electrode sheet (2) of opposite polarities, wherein the first electrode sheet (1) and the second electrode sheet (2) both include a main body (11) and at least one tab group (12), the first electrode sheet (1) and the second electrode sheet (2) are winded around a winding axis (K) such that their respective main bodies (11) overlap to form a winding body (S), and after the main bodies (11) have been winded a plurality of electrode sheet layers (111) are formed along a radial direction of the winding main body (S); wherein, the tab group (12) includes a plurality of stacked tabs (12') which protrude from the main body (11), and at least two adjacent tabs (12') in the tab group (12) are separated by at least one electrode sheet layer (111) of same polarity in the radial direction.

An embodiment of the present application provides an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing device and method, which belong to the technical field of batteries. The electrode assembly includes a negative electrode plate and a positive electrode plate, the negative electrode plate and the positive electrode plate being wound in a winding direction to form a winding structure, the winding structure including a bending area. Both the negative electrode plate and the positive electrode plate include a plurality of bending portions located in the bending area. At least one bending portion in the negative electrode plate is a first bending portion, and an active substance capacity per unit area outside the first bending portion is greater than an active substance capacity per unit area inside the first bending portion; and/or, at least one bending portion in the positive electrode plate is a second bending portion, and an active substance capacity per unit area outside the second bending portion is greater than an active substance capacity per unit area inside the second bending portion. In the electrode assembly of this structure, the active substance arrangement in at least part area of the bending area of the electrode plate is more reasonable with better economic efficiency.

Provided in the embodiments of the present application are a power management system, an MCU, a BMS and a battery, which can satisfy the power supply requirements of the MCU, and achieve a higher reliability. The power management system comprises: a primary power supply module, which is connected to a power source, and is used for generating a first voltage according to the voltage of the power source, diagnosing the first voltage, and storing a diagnosis result of the first voltage; and a secondary power supply module, which is connected to the primary power supply module and is used for generating a second voltage according to the first voltage, wherein the second voltage is less than the first voltage, and the second voltage is an operating voltage of an MCU; and the MCU, which is connected to the primary power supply module and the secondary power supply module, and is used for reading the diagnosis result of the first voltage from the primary power supply module and determining, according to the diagnosis result of the first voltage, whether to control a BMS to enter a safe state.

Embodiments of this application provide a control method and control apparatus for a thermal management system. The thermal management system includes a liquid coolant system and a refrigerant system, the liquid coolant system including a heat dissipation apparatus and a cold storage apparatus, where the refrigerant system is configured to cool a battery and/or the cold storage apparatus, the heat dissipation apparatus is configured to cool the battery and/or the cold storage apparatus, and the cold storage apparatus is configured to cool the battery. The method includes: obtaining first thermal management parameter information, where the first thermal management parameter information includes parameter information of the battery, and the parameter information of the battery includes temperature information of the battery and/or parameter information reflecting a heating rate of the battery; and determining a thermal management strategy of the thermal management system based on the first thermal management parameter information. The control method and control apparatus for a thermal management system provided in this application can control the operation of the thermal management system in a more rational manner and can perform effective cooling and heat dissipation for a battery, improving performance and service life of the battery.

A charging system for charging a power battery of a vehicle, including: a battery apparatus configured to store energy and charge the power battery by releasing energy; a charging connector configured to connect to the vehicle so as to charge the power battery via the charging connector; and a thermal management system, including a first heat exchange flow path, a second heat exchange flow path, and a first switching mechanism. The first heat exchange flow path includes a first heat exchanger configured to exchange heat with the battery apparatus. The second heat exchange flow path includes a second heat exchanger configured to exchange heat with the charging connector. The second heat exchange flow path is connected to the first heat exchange flow path via the first switching mechanism. In this way, through an operation of switching the first switching mechanism, the second heat exchange flow path and the first heat exchange flow path become communicated with each other via the first switching mechanism or a communication relationship between the second heat exchange flow path and the first heat exchange flow path via the first switching mechanism is disconnected.