Contemporary Amperex Technology Co., Ltd.

Ningde Amperex Technology Limited

Dongguan Amperex Technology Limited

Contemporary Amperex Technology Limited

Shengwei Wang

Fuping Luo

Xinxin Du

Xin Fu

Qiang Zheng

Chao Gao

Qiaoge Wang

Yu Luo

Wenzhu Xu

Guangbo Lu

Qifan Zou

Yanyun Tan

Manfang Zhang

Zhimin Dan

Xiyang Zuo

Chuanmiao Yan

Zhanzhao Fang

Tiancong Wang

Jiao Cao

Fan Sun

Hongguang Shen

Jianqing Sun

The present disclosure provides a lithium-ion battery, the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte. The positive active material comprises a material having a chemical formula of LiNiCoMO, the negative active material comprises a graphite-type carbon material, the lithium-ion battery satisfies a relationship 58%&#x2264;KY/(KY+KY)&#xd7;100%&#x2264;72%. In the present disclosure, by reasonably matching the relationship between the anti-compression capability of the positive active material and the anti-compression capability of the negative active material, it can make the positive electrode plate and the negative electrode plate both have good surface integrity, and in turn make the lithium-ion battery have excellent dynamics performance and excellent cycle performance at the same time.

Lithium-ion battery

Disclosed are a heating method for a rechargeable battery, a control unit and a heating circuit. The heating method comprises: determining a frequency value of a pulse current for heating the rechargeable battery in response to a heating command of the rechargeable battery; determining a current value of the pulse current according to the frequency value and an acquired state parameter of the rechargeable battery; judging whether the current value satisfies a preset heating demand; if the current value satisfies the heating demand, generating the pulse current under control according to the frequency value; if the current value does not satisfy the heating demand, re-determining the frequency value and the current value of the pulse current. The embodiments of the present disclosure further provide a control unit and a heating circuit.

Heating method for rechargeable battery, control unit and heating circuit

A method, an apparatus and a system for controlling charging of a battery module are provided in the present disclosure. The method for controlling charging of the battery module may include: acquiring an internal pressure value of the battery module; determining a target pressure threshold range to which the acquired internal pressure value of the battery module belongs, based on a plurality of predefined pressure threshold ranges; obtaining a target charge cutoff voltage corresponding to the target pressure threshold range, based on a correspondence relationship between a plurality of predefined charge cutoff voltage and the plurality of predefined pressure threshold ranges; and controlling the battery module to be charged based on the obtained target charge cutoff voltage.

Method, apparatus and system for controlling charging of a battery module

The present invention provides a lithium ion battery and a negative electrode material thereof. The negative electrode material includes a mixture of a graphite and an amorphous carbon, wherein the graphite is subjected to a surface treatment, and the surface treatment manner is a combination of mechanical fusion modification and spray drying coating, and wherein the graphite has a graphitization degree of 90-96%, an average particle diameter D50 of 13-25 &#x3bc;m and a specific surface area BET of 0.8-2.5 m/g, and the amorphous carbon has a graphitization degree of 65-80%, an average particle diameter D50 of 2-15 &#x3bc;m and a specific surface area BET of 1.0-3.0 m/g.

Lithium ion battery and negative electrode material thereof

The present disclosure provides a lithium-ion secondary battery, which comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte. The lithium-ion secondary battery satisfies a relationship: 1.5&#x2264;(m&#xd7;C)/(&#x3c1;&#xd7;Cap)&#x2264;6.5. In the present disclosure, by comprehensively considering the rated capacity of the battery, the mass of the electrolyte and the intrinsic parameters of the electrolyte and reasonably quantifying the relationship thereof, the lithium-ion secondary battery can have good dynamics performance and longer cycle life at the same time.

Lithium-ion secondary battery

The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value Ifor the ncharging stage of the battery, according to the battery temperature and a mapping relationship between different temperature ranges and charging current values I, wherein a preset charging cut-off voltage value Vfor the ncharging stage is greater than V; charging the battery with Iin the jcharging stage; acquiring a voltage value of the battery at the current time; if the voltage value is less than V, continuing to charge the battery with I; if the voltage value is not less than Vand j&#x3c;N, charging the battery with I; if the voltage value is not less than Vand j=N, stopping charging the battery.

Method, apparatus, and device for charging a battery and storage medium

The present disclosure provides a positive electrode plate and a battery, the positive electrode plate comprises a positive current collector and a positive film, the positive film is provided on least one surface of the positive current collector and comprises a positive active material, the positive active material comprises a layered lithium-containing compound, and an OI value of the positive film represented by Cis less than or equal to 150. The positive electrode plate of the present disclosure has smaller swelling and excellent dynamics performance, and the battery of the present disclosure has high safety performance, excellent dynamics performance and long cycle life at the same time.

Positive electrode plate and battery

The present disclosure provides a lithium-ion battery, and the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte. The positive active material comprises a material with a chemical formula of LiNiCoMO, the negative active material comprises graphite, the OI value of the positive film represented by OIand the OI value of the negative film represented by OIsatisfy a relationship: 0.05&#x2264;OI/OI&#x2264;10. By reasonably matching the OI value of the positive film represented by OIand the OI value of the negative film represented by OIand making OI/OIbetween 0.05 and 10, the dynamics performance of the positive electrode plate and the dynamics performance of the negative electrode plate can achieve an optimal match, the lithium-ion battery can have higher charging capability, and also have excellent cycle life and excellent safety performance during the long-term fast charging use.

Method, apparatus and system for controlling charging of battery module

A method, an apparatus and a device for charging a battery are provided. The method may include: defining a charging current Ifor an Nth charging stage of a charging process based on charging capability of the battery, wherein I&#x3c;I; defining a charge cutoff voltage Vfor the Nth charging stage of the charging process, wherein V&#x3e;Vand Vis smaller than a theoretical charge cutoff voltage V; in case that the N-1th charging stage is not a last charging stage, charging the battery with Iduring the N-1th charging stage and proceeding to the Nth charging stage when a voltage across the battery reaches V; and in case that the N-1 th charging stage is the last charging stage, charging the battery with Iduring the N-1th charging stage and stopping charging when the voltage across the battery reaches V.

Method and device for multi-stage battery charging

A method for charging a lithium ion battery includes the steps of: 1) determining a maximum charging current Iand a lowest anode potential &#x3b7; of the lithium ion battery at which no lithium precipitation occurs; 2) charging the lithium ion battery at a constant current of Iwhich is greater than Ifor a charging time t; 3) discharging the lithium ion battery at a constant current of Iwhich is less than Ifor a discharging time t, 5&#x2264;t/t&#x2264;50; 4) repeating steps 2) and 3) until a cutoff voltage of the lithium ion battery reaches Vand standing the lithium ion battery for a standing time t; and 5) charging the lithium ion battery at a constant current of Iuntil the cutoff voltage of the lithium ion battery reaches Vand charging the lithium ion battery to a cutoff current of Iat a constant voltage.

Method for charging a lithium ion battery

Embodiments of the present application provide a method of battery charging, which relates to the field of battery charging and is capable of effectively improving safety performance of the battery. The method includes: obtaining an anode open circuit voltage curve, an anode impedance curve, a lithium deposition potential threshold and a state of charge, corresponding to a battery; determining a current anode open circuit voltage according to the anode open circuit voltage curve and the state of charge; determining a current anode impedance according to the anode impedance curve and the state of charge; determining a current charging current according to the current anode open circuit voltage, the current anode impedance and the lithium deposition potential threshold; and charging the battery according to the current charging current. Embodiments of the present application are applicable to a rapid battery charging process.

Method and apparatus of battery charging

The present invention provides a fast charging method for battery, including the steps as follows: (1) the battery is charged with a constant current Iand the charging time is t; (2) the battery is charged with a constant current Iand the charging time is t; (3) the battery is discharged with the constant current Iand the discharging time is t, recycling until the voltage reaches a pre-charging voltage of battery; (4) the battery is standed after the voltage reaching the pre-charging voltage of battery, and the rest time is t, and then the battery is charged with a constant current Iuntil the voltage reaching a cut-off voltage of battery, and then the battery is charged with a constant voltage until the current reaching a cut-off current I; wherein, I&#x3c;I, t&#x3c;t, t&#x3c;t, I&#x3c;I&#x2266;I, I&#x2266;I. The fast charging method provided in present invention can decrease the polarization in pulse charging phase, increase the time of whole pulse charging phase, improve the charging speed in pulse charging phase, and thus shorten the full-charging time.

Fast charging method for battery

The present application discloses a binder for a lithium ion battery, which comprises a polymer obtained through emulsion polymerization of a monomer in the presence of a reactive emulsifying agent. The binder is used in fabrication of a lithium ion electrode plate, whereby a thin film formed on the surface of an electrode membrane and fine channels formed in the electrode membrane with the use of a conventional emulsifying agent during the electrode membrane-forming process are eliminated, and the lithium ion conductivity of the electrode membrane is improved. Meanwhile, with the use of the reactive emulsifying agent, the bonding effect of the binder and the stability of the electrode membrane are improved, thereby greatly improving the charging rate and cycle life of the lithium ion battery.

Growing community of inventors

Ningde, China

Shengwei Wang