Home > News > Industry News
Publisher: Administrator Date：2022-10-26
The accelerated development of high specific energy, high nickel battery and high rate rechargeable battery is posing greater challenges to the temperature and safety of battery thermal runaway.
Miao Xiangkui, Product Director of Shenzhen Kemin Sensor Co., Ltd. (hereinafter referred to as "Kemin Sensor") Innovation Research Institute, delivered a keynote speech entitled "New energy vehicle BMS thermal protection system: a leading solution for failure proof temperature sensor harness integration".
Miao Xiangkui pointed out that in addition to overcharge and overdischarge, external short circuit and internal short circuit, mechanical reasons, local high temperature and collision, the battery thermal runaway is also related to the lack of attention paid to the BMS temperature monitoring system in design. In order to save costs, many domestic battery plants have significantly reduced the number of temperature sensors, making the battery pack have blind spots in temperature monitoring.
At the same time, the selection of temperature probe has low sensitivity and long reaction time; Unreasonable installation position, glue bonding, displacement and out of control temperature detection will result in real-time delay and failure of BMS temperature monitoring, failure to timely discover the precursor and early warning of thermal out of control, timely power failure and timely treatment, which will cause rapid temperature rise and out of control in the later period.
"Therefore, it is necessary to select a temperature sensor with high sensitivity, high accuracy of temperature control point, high measuring area and low self heating error."
As a leader in the domestic temperature sensor industry, Kemin Sensor offers innovative solutions:
1、 Simplify the flat wire temperature sensor assembly. Compared with traditional wire harness, this product is simpler in structure and easier to install. In addition, the wire material is more flat, which saves more space in the battery pack and greatly reduces the weight of traditional wire harness. At the same time, this product has greatly reduced the cost.
2、 Failure proof double thermistor temperature sensor. Double thermistors in parallel can improve the battery BMS system to identify temperature and temperature error, and can also achieve the accuracy of mutual inspection test data. The company adopts flat wire crimping technology. It completely solves the common problem of traditional wire harness winding.
3、 Modular flat wire temperature sensing component integration. The modules in the module use the dual thermistor temperature measurement technology. In the battery management system, it is not only safe and reliable, but also can detect each other's temperature measurement status, which improves the accuracy of temperature measurement. At the same time, the overall structure of the scheme is simple, light weight, orderly distribution, low cost and high use value.
4、 Soft package sandwich temperature sensor. Kemin's new soft package sandwich temperature sensor can solve the problems of inaccurate soft package temperature measurement, sensor failure and sensor burst.
5、 Battery liquid cooling temperature sensor. The temperature measuring head is close to the outer wall of the liquid cooling pipe to achieve temperature measurement, which is simple in structure, strong in firmness, convenient in loading and unloading, and good in consistent temperature measurement. At the same time, the leakage phenomenon of the traditional liquid cooling sensor in the use process is solved.
CN