Multi-thermistor temperature sensor and power battery BMS device detecting system

Abstract

The invention discloses a multi-thermistor temperature sensor comprising a shell, at least two thermistors and at least three wires. The pins of the thermistors are connected to each other to form a mutual parallel relationship between the thermistors, and the pins of the thermistors are respectively connected to one end of the wires in a one-to-one correspondence. All the thermistors and all theends of wires connected with the thermistors are wrapped in the shell, and the other ends of all the wires extend outside the shell. The shell is filled with epoxy resin. According to the multi-thermistor temperature sensor and power battery BMS device detecting system, a plurality of thermistors are connected in parallel and then potted in the shell of the sensor for solidification, the same temperature collecting point is collected by several identical thermistors, the temperature information is feedback to the battery BMS device at the same time, so that the control system of the battery BMS device can automatically shield the abnormal data of the thermistors and make a prompt if one of the thermistors is abnormal, and normal driving of the vehicle will not be affected due to the presence of multiple thermistors.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a multi-thermistor temperature sensor and a power battery BMS device detection system. Background technique [0002] In the existing power battery BMS system detection devices, SMD chip resistors are indirectly attached to the aluminum sheet to detect the temperature of each battery in the battery BMS system. When the traditional SMD chip resistors are used as temperature sensors for detection, And most of the existing temperature sensors are a sensitive element, which will lead to: due to the limitation of SMD chip resistance, the temperature measurement is inaccurate with a difference of 5-10°C; since there is only one sensitive element, once each battery in the battery BMS system If there is a problem, it is impossible to distinguish whether it is a battery problem or a temperature sensor problem; if the SMD chip resistor fails, it will cause dire consequences, and the battery may insta...

AI Technical Summary

Problems solved by technology

[0002] In the existing power battery BMS system detection devices, SMD chip resistors are indirectly attached to the aluminum sheet to detect the temperature of each battery in the battery BMS system. When the traditional SMD chip resistors are used as temperature sensors for detection, And most of the existing temperature sensors are a sensitive element, which will lead to: due to the limitation of SMD chip resistance, the temperature measurement is inaccurate with a difference of 5-10°C; since there is only one sensitive element, once each battery in the battery BMS system If there is a problem, it is impossible to distinguish whether it is a battery problem or a temperature sensor problem; if the SMD chip resistor fails, it will cause dire consequences, and the battery may instantly heat up and burn. If this phenomenon occurs when the electric vehicle is driving on the road, there will be It may cause life safety to others, therefore, there is an urgent need for a temperature sensor with high precision and multiple sensitive elements

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