Circuit for solving fixed and single temperature protection parameter in pure hardware BMS

Abstract

The invention discloses a circuit for solving a fixed and single temperature protection parameter in a pure hardware BMS, and the circuit comprises a battery module, an AFE chip U1, a power conversion module, a control module, a discharging high-temperature module, a first charging high-temperature module, a first charging low-temperature module, a second charging high-temperature module, a second charging low-temperature module, a discharging low-temperature module, a thermistor module, and a power supply VCC. According to the invention, the problem that a pure hardware scheme has no discharge low-temperature protection function is solved, and the discharge low-temperature protection function is realized by adding the thermistor RT2. According to the invention, the problem of few temperature detection ports in a pure hardware scheme is solved. According to the invention, a more complex logic problem caused by change of a pure hardware BMS scheme during temperature detection and temperature protection is avoided.

Description

technical field [0001] The invention relates to a circuit for solving the problem of fixed and single temperature protection parameters in a pure hardware BMS. Background technique [0002] In the pure hardware protection scheme of the battery, the scheme for temperature acquisition and temperature protection is as follows: figure 1 As shown, by the internal detection pin NTC, when the protection temperature value set by the protection IC is reached, the corresponding protection action will be executed according to the internal protection logic. Taking the pure hardware solution widely used in the market as an example, the temperature protection of the pure hardware solution is as follows: figure 2 As shown, there are the following disadvantages: 1. The parameters are single, and the protection values ​​of charging low temperature, charging high temperature, and discharging high temperature are only a few types in the selection list, which is very simple; 2. The parameters...

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Problems solved by technology

Taking the pure hardware solution widely used in the market as an example, the temperature protection of the pure hardware solution is as follows: figure 2 As shown, there are the following disadvantages: 1. The parameters are single, and the protection values ​​of charging low temperature, charging high temperature, and discharging high temperature are only a few types in the selection list, which is very simple; 2. The parameters are fixed. Once the model of the protection IC is selected, The temperature protection value will be fixed; 3. The matching problem with the battery cell, the allowable charging and discharging temperature of the battery cell commonly used in the market cannot completely match the selected protection parameters, such as image 3 As shown; 4. Some pure hardware solutions do not have discharge low-temperature protection, and the use of lithium batteries in harsh low-temperature environments will have a negative impact on product experience and battery life.

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