Method for parallel connection of two vehicle battery systems

Abstract

The invention discloses a method for realizing parallel connection of two sets of vehicle-mounted battery systems. A general positive relay and the like are included; the general positive relay, a battery management system, a first parallel relay, a parallel-connection protection relay and a second parallel relay are connected in parallel; the parallel-connection protection relay is connected with a pre-charging resistor in series; the battery management system is connected with a 24V power supply in series; and a first battery system and a second battery system are connected in parallel for supplying power for at least one electronic load. By adoption of the method, the problem existing in improvement of charging and discharging rate when the conditions of energy density, energy requirement and the like are not changed in the power supply system of the existing power automobile is solved; compared with the conventional design, the charging and discharging current can be effectively lowered; damage to a high-voltage device caused by heating due to a high current is effectively reduced, heating in the connecting place of battery modules is lowered, and the long-standing problem existing in module connecting design is relieved; the problem of ring current impact of parallel instantaneous high current in parallel connection use is solved; and the battery system is more reliable, and the service life of electrical devices can be prolonged.

Description

technical field [0001] The invention relates to the field of a vehicle battery system, in particular to a method for parallel connection of two vehicle battery systems. Background technique [0002] In the existing technology, a battery system is mainly used as the power source of the car. However, with the continuous change of social needs, the voltage platform continues to rise, and the demand for high-rate output is urgent. difficulties, especially the higher and higher requirements for high-voltage connections. [0003] In order to improve the social needs, two sets of systems are used in parallel as the power source of the electric vehicle, which can realize the characteristics of high voltage and low current of a single system, and effectively improve the current influence on the device caused by the temperature rise caused by excessive current. In the past, supercapacitors were used as the power source of electric vehicles. This method can solve the problem but at th...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for parallel connection of two sets of battery systems in vehicles, which solves the shortage of existing battery systems in existing vehicles as a power source, and can be used in situations where energy density and energy demand remain unchanged. Increase the charge and discharge rate

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