One-line communication point-to-point type single lithium ion battery management system based on system on chip

Abstract

The invention discloses a lithium ion battery management system which is applicable to construction of a high-power and high-capacity power source for an electric bicycle and an electric vehicle. By monitoring and managing a single lithium ion battery, the whole battery management system is structuralized and modularized; and by constructing a point-to-point type communication network system, a network structure is simple and practical.

Description

Technical field [0001] The invention relates to power battery devices for electric bicycles and electric vehicles, and is especially suitable for high-capacity and high-power power sources composed of lithium-ion batteries. Background technique [0002] With the development of the lithium-ion battery market, the battery management system has become more and more complex and diverse, which can basically be divided into two fields: special-purpose and general-purpose. [0003] The limited number of lithium-ion batteries managed by the dedicated battery management system is suitable for the management system of small lithium-ion batteries used in mobile phones, notebook computers, digital cameras and portable small appliances, but not suitable for large-scale lithium-ion battery management systems for electric bicycles and electric vehicles. [0004] General-purpose battery management systems generally adopt a layered or distributed architecture, which does not involve the mana...

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Problems solved by technology

[0004] General-purpose battery management systems generally adopt a layered or distributed architecture, which does not involve the management and monitoring of single lithium-ion batteries. Since the chemical characteristics of lithium-ion batteries change with the use of time and the use of the environment, then Its internal resistance and capacity will also change accordingly. If the data sampling unit is too far away from the single lithium-ion battery, impedance, parasitic capacitance, and parasitic inductance will be generated, which will be unfavorable to the balance between batteries and the estimation of battery capacity. The performance and service life of lithium-ion batteries, for example, was published and authorized by the People's Republic of China on June 7, 2006, and the technical solution titled "Distributed Battery Management System and Management Method" with the patent No. 200410081434. Data sampling of battery-saving batteries. Most general-purpose battery management systems use CAN bus as the communication bus. CAN bus is not a battery management system bus but a communication bus for automotive electronics. There is a difference between the two, its communication protocol and electrical characteristics It is very reluctant to use it in the battery management system. For example, it was published and authorized by the People's Republic of China on December 8, 2004. The patent number is 200310111599.8 and the name is "A Multi-layer Distributed Battery Management System Based on CAN Bus", 2004 It was published and authorized by the People's Republic of China on December 22, and the patent number is 200410013807.5. The name is "A Power Battery Management System for Electric Vehicles" and it was published and authorized by the People's Republic of China on December 31, 2008, and the patent number is 200810021154.3 The technical solution named "Distributed Battery Management System and Its Management Method" uses CAN bus. CAN bus is two communication lines. If there are too many communication lines and too many layers, the battery management system will change. Intricate, affecting the speed of the entire network, and the communication network of the battery management system and the communication network of the automotive electronics are in the same network layout, the two network systems are not isolated, which greatly reduces the anti-interference ability of the battery management system, and the above four The central processing unit of each patented technical solution is designed with the fourth generation integrated circuit (microprocessor), and the peripheral circuit is complex, resulting in an increase in the volume of the control circuit, which does not conform to the shape and structure of the single lithium-ion battery, and cannot be controlled by the single battery. The current integrated circuit has developed to the fifth generation, that is, the system on a chip. Therefore, the design concept of the current general-purpose battery management system is outdated and cannot represent the development direction of the battery management system.

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