Beijing Welion New Energy Technology Co., Ltd

Beijing Electric Vehicle Co., Ltd.

Beijing Weilion New Energy Technology Co., Ltd

Huigen Yu

Chao Li

Hong Li

Qi Yang

Wenjun Li

Jie Huang

Zhen Zhang

Yongwei Li

Baopeng Hou

Jin Xiang

Yafei He

Zhongke Yang

Rui Liang

Zhiqiang Guo

Yunhao Liu

Xingquan Qin

Liguo Yan

Jun Sheng

Qianhui Zhang

Zepeng Ding

Danrong Li

Donglin Cao

Dangqing Li

Shengbin Wang

Yimin Fu

Disclosed in the invention is a lithium battery production process, which comprises: through sequentially implemented processes of pre-compounding, winding for lamination, cutting, reclaiming material, continuously processing and assembling finished products, each electrode and separator are laminated, processed and formed, and finally assembled into a battery prefabricated product. The lithium battery production process is simple and efficient to implement, and it may realize continuous production of lithium battery products, thereby greatly improving battery production efficiency, and correspondingly simplifying the entire process flow to reduce the labor intensity of the staff. Also disclosed is a lithium battery production equipment for the above lithium battery production process.

Lithium battery production process and equipment

A system used to supplement an electrode with lithium or sodium, includes an electrode treatment unit including metal source-unwinding shafts (), an electrode-unwinding shaft (), and press roller devices () configured to allow physically adhesive contact of the electrode with the metal source, so that the electrode () is supplemented with the metal from metal sources (); a temperature control treatment device () configured to improve the quality and uniformity of metal supplement; and a stripping unit configured to peel off the metal source that has been rolled by the press roller devices (), wherein the metal sources () are a ribbon-shaped lithium source or a ribbon-shaped sodium source. This system and the method using the system can produce an electrode having high cycle efficiency.

System for preparing electrode having high cycle efficiency, method for preparing electrode having high cycle efficiency, and application thereof

Provided are a gravure coating device for preparing a large-width ultrathin metal lithium strip and the preparation method, relating to the technical field of preparation of metal lithium materials. The device comprises: a lithium-melting tank (), a micro-gravure roller (), a unwinding device, a substrate back roller (), a hot pressing device and a winding device; wherein the lower portion of the micro-gravure roller () is immersed into the liquid lithium in the lithium-melting tank (); one side of the micro-gravure roller () is provided with a hot scraper (), and the end portion of the hot scraper () is in contact with the surface of the micro-gravure roller (); the substrate back roller () is arranged diagonally above the micro-gravure roller (); the unwinding device is arranged on one side of the substrate back roller (); the winding device is arranged above the substrate back roller (); the hot pressing device is arranged between the substrate back roller () and the winding device; after passing through the substrate back roller () and the hot pressing device, the substrate on the unwinding device is winded onto the winding device. The device is simple in structure and reasonable in design, effectively improves the coating uniformity, and realizes automatic production of ultrathin metal lithium strips with a thickness of 1-50 μm, thereby greatly improving work efficiency and product quality.

Gravure coating device for preparing large-width ultrathin metal lithium strip and method therefor

Provided are an asynchronous heating and calendering device, a large wide ultra-thin lithium metal foil, and preparation method and use thereof, wherein the asynchronous heating and calendering device comprises: a pulling-substrate unwinding unit (E) for unwinding a pulling-substrate (P); a lithium strip unwinding unit (D) for unwinding a lithium strip (S); an asynchronous heating and calendering unit (H) which comprises: a first calendering roller (B), a second calendering roller (A) and a heating box (C), wherein the heating box (C) is used to heat the first calendering roller (B), the first calendering roller (B) heats the pulling-substrate (P), and the first calendering roller (B) and the second calendering roller (A) have parallel axes and are arranged opposite to each other, so that the pulling-substrate (P) and the lithium strip (S) are combined into a composite strip (Z); and a winding unit (G) for winding the composite strip (Z). A large wide ultra-thin lithium metal foil with a uniform thickness may be prepared by providing a heating box (C) and asynchronous first calendering roller (B) and second calendering roller (A) in said device, and the application of this lithium foil in batteries has a relatively high initial efficiency. The width of the lithium foil is 1-600 mm; the thickness of the lithium foil is 1-20 μm; and the initial efficiency of the battery reaches 98%.

Asynchronous heating and calendering device, large wide ultra-thin lithium metal foil, preparation method therefor, and application thereof

Disclosed are a device and a method for testing a battery equalization circuit. The device includes: multiple voltage supply modules, each of which being connected to a corresponding equalization module to form multiple test loops, and being configured to supply simulated voltage of the battery cell to a corresponding equalization module; multiple equalization current detection modules, each of which being configured to detect equalization current of each test loop; multiple switch assemblies and multiple leakage current detection modules, each switch assembly being connected in parallel with a corresponding leakage current detection module, and each leakage current detection module being configured to detect leakage current generated by a corresponding equalization module when the leakage current detection module is connected into a corresponding test loop; and a control module, configured to control each switch assembly and each equalization module to detect the equalization current and the leakage current of each test loop.

Method and device for testing battery equalization circuit

Disclosed are equalization control method, apparatus and circuit for a power battery. The equalization control method includes: detecting a to-be-equalized cell in the power battery satisfying a preset equalization starting condition, and starting to perform an equalization on the to-be-equalized cell; in a process of performing the equalization on the to-be-equalized cell, determining whether the to-be-equalized cell satisfies an equalization stopping condition; when it is determined that the to-be-equalized cell satisfies the equalization stopping condition, stopping performing the equalization on the to-be-equalized cell, and when the to-be-equalized cell satisfies an equalization continuing condition, continuing to perform the equalization on the to-be-equalized cell; and when it is determined that the to-be-equalized cell does not satisfy the equalization stopping condition, continuing performing the equalization on the to-be-equalized cell, and finishing the equalization until the time period during which the equalization is performed on the to-be-equalized cell satisfies the equalization time calculated value.

Equalization control method, apparatus, and circuit for power battery

Growing community of inventors

Beijing, China

Huigen Yu