A battery thermal management control system and vehicle with anti-failure function

Abstract

The utility model discloses a failure-proof battery thermal management control system and vehicle, including a BMS, a temperature sensor, and a TMS thermal management system. The temperature sensor is used to collect temperature data of the battery, and its output end is connected to the input end of the BMS. The output end of the BMS outputs a heating or cooling drive signal to the drive end of the TMS thermal management system, and the TMS thermal management system is used to drive the operation of the heater or cooler; the control system also includes a temperature switch, which is arranged in a battery module, and the switch contacts of the temperature switch are arranged in series between the output end of the BMS and the heating drive end of the TMS thermal management system. The advantages of the utility model are: adding a switch to perform redundant control on the operation of the TMS, avoiding temperature anomalies caused by continuous abnormal heating of the battery due to abnormal conditions such as software and BMS chips, improving the reliability of the operation of the thermal management system, and avoiding possible thermal runaway risks.

Description

Technical Field

[0001] The utility model relates to the field of battery heating and cooling control, in particular to a failure-proof battery thermal management control system. Background Art

[0002] With the development of new energy technology, electric vehicles have gradually become mainstream, and the power batteries of electric vehicles generally require thermal management, such as the battery heating assembly and battery heating system with patent application number 201920030289.X, which discloses a battery heating assembly and a battery heating system, belonging to the field of vehicle battery technology. The battery heating assembly and battery heating system provided by the embodiment of the utility model, when the PTC heater is required to heat the battery to be heated, the battery management system BMS controls the PTC heater to heat the battery to be heated. During the heating process, the first temperature control switch and the second temperature control switch can respectively collect the temperature value of the high-voltage circuit and the temperature value of the low-voltage control circuit of the PTC heater, and control the PTC heater to be powered on or off according to the collected temperature values, thereby controlling the PTC heater to heat the battery to be heated or stop heating the battery to be heated, and realizing temperature control. At the same time, during the process of the PTC heater being powered on or off, the fan is always running to ensure that the temperature in the box where the battery to be heated is placed is evenly maintained within a certain range, and the overall effect of constant temperature regulation is achieved.

[0003] The above patent discloses a battery heating system to achieve heating of the battery pack. In the prior art, temperature sensors are generally used to collect temperature data and then sent to the BMS. The BMS outputs a corresponding wake-up signal or start signal to the temperature management system TMS. The control unit of the temperature management system TMS outputs control signals to the heater and cooler respectively, which are used to heat and cool the battery respectively, thereby achieving temperature management. This method relies on the start or wake-up signal output by the BMS to continuously control heating or cooling. The heating control signal output by the BMS is generally based on the data of the temperature sensor. However, since the BMS collects temperature data and processes the output control signal, the relevant parameters have time limits and there may be signal failures. After failure, the TMS may continue to receive heating signals or cooling signals, which will cause abnormal heating or abnormal cooling of the battery, causing abnormal battery temperature and affecting the battery life. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a failure-proof battery thermal management control system, which controls the operation of the TMS by introducing a temperature switch into the TMS wake-up or drive circuit, thereby avoiding the safety hazard of the battery pack being overheated due to continuous heating of the TMS.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a failure-proof battery thermal management control system, including a BMS, a temperature sensor, and a TMS thermal management system, wherein the temperature sensor is used to collect temperature data of the battery, and its output end is connected to the input end of the BMS, and the output end of the BMS outputs a heating or cooling drive signal to the drive end of the TMS thermal management system, and the TMS thermal management system is used to drive the operation of the heater or cooler; the control system also includes a temperature switch, which is arranged in a battery module, and the switch contacts of the temperature switch are arranged in series between the output end of the BMS and the heating drive end of the TMS thermal management system.

[0006] There are multiple temperature switches, which are respectively arranged at different positions of the battery module. The switch contacts of the multiple temperature switches are connected in series in sequence and then connected in series between the output end of the BMS and the heating drive end of the TMS thermal management system.

[0007] The control system further comprises a low temperature circuit breaker, which is arranged in the battery module, and the switch contacts of the low temperature circuit breaker are arranged in series between the output end of the BMS and the cooling drive end of the TMS thermal management system.

[0008] There are multiple low-temperature circuit breakers, which are respectively arranged at different positions of the battery module. The switch contacts of the multiple low-temperature circuit breakers are connected in series in sequence and then connected in series between the output end of the BMS and the cooling drive end of the TMS thermal management system.

[0009] The control system also includes a voltage acquisition module, which detects the voltage signal of the BMS output end and the voltage signals of the heating drive end and the cooling drive end of the TMS thermal management system respectively; the output end of the voltage acquisition module is connected to the vehicle controller, and the vehicle controller is used to drive the alarm.

[0010] The alarm is a vehicle-mounted speaker or a vehicle-mounted display screen.

[0011] A car comprises the above-mentioned failure-proof battery thermal management control system.

[0012] The advantages of the utility model are: adding switches to perform redundant control on the operation of the TMS, avoiding temperature abnormalities caused by continuous abnormal heating of the battery due to abnormal conditions such as software and BMS chips, improving the reliability of the thermal management system, avoiding possible risks of thermal runaway, improving the stable heating of the vehicle-mounted thermal management system, and increasing the life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0014] Figure 1 This is a schematic diagram of the thermal management control system of the utility model. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0016] Traditional battery heating control is that the BMS outputs a heating control signal to the TMS controller. The TMS controller can start the heater to heat the battery only after receiving the heating drive control signal from the BMS. Here, TMS is the abbreviation of temperature management system, and the TMS controller is a temperature controller, which mainly drives the heater. However, due to various situations such as delays or interference in the control signal output by the BMS and errors in the software output signal, there may be a situation where there is no need to heat the battery but the signal output by the BMS is still to control the TMS controller to continue to drive the heater, which will cause abnormal heating of the battery; similarly, it will also cause abnormal cooling. Once this abnormal situation occurs, the thermal management control solution of the existing technology cannot solve it, so it needs to be improved.

[0017] A failure-proof battery thermal management control system includes a BMS, a temperature sensor, and a TMS thermal management system. The temperature sensor is used to collect temperature data of the battery, and its output end is connected to the input end of the BMS. The output end of the BMS outputs a heating or cooling drive signal to the drive end of the TMS thermal management system, and the TMS thermal management system is used to drive the operation of the heater or cooler. The control system also includes a temperature switch, which is arranged in a battery module, and the switch contacts of the temperature switch are arranged in series between the output end of the BMS and the heating drive end of the TMS thermal management system. There are multiple temperature switches, which are respectively arranged at different positions of the battery module. The switch contacts of the multiple temperature switches are sequentially connected in series and then connected in series between the output end of the BMS and the heating drive end of the TMS thermal management system.

[0018] A temperature switch is a temperature switch that uses a bimetallic strip as a temperature sensing element. When the appliance is working normally, the bimetallic strip is in a free state and the contacts are in a closed state. When the temperature rises to the operating temperature value, the bimetallic element is heated to generate internal stress and quickly operates, opening the contacts and cutting off the circuit, thereby playing a thermal protection role. Since the BMS outputs an activation signal, a drive signal or a control signal to drive the TMS controller, the TMS controller will only drive the heater to work if the signal is always valid; if abnormal heating occurs, the battery pack temperature will rise abnormally, and when it reaches a certain temperature, the temperature switch set in the battery pack will disconnect its contacts. Since the switch contacts of the temperature switch are set in series between the BMS output and the input of the TMS controller, when the temperature switch at any position detects that the battery temperature exceeds the abnormal level, it will disconnect its contacts, thereby disconnecting the connection between the BMS output end and the heating drive end of the TMS controller, thereby blocking the signal from the heating drive end of the TMS controller. If the TMS heater has no driving signal at the heating drive end, it will not control the operation of the heater, and will not continue to heat abnormally. As a redundant protection measure, the temperature switch will not affect normal operation during normal heating control, but will activate the redundant protection function once the heating is abnormal.

[0019] Similarly, battery thermal management includes not only heating but also cooling. Therefore, a low-temperature circuit breaker is also provided in this embodiment. The low-temperature circuit breaker is arranged in the battery module, and the switch contacts of the low-temperature circuit breaker are arranged in series between the output end of the BMS and the cooling drive end of the TMS thermal management system. There are multiple low-temperature circuit breakers, which are arranged at different positions of the battery module. The switch contacts of multiple low-temperature circuit breakers are connected in series in sequence and then connected in series between the output end of the BMS and the cooling drive end of the TMS thermal management system.

[0020] The low-temperature circuit breaker is a low-temperature protection switch. When the temperature is higher than the temperature threshold, its switch contacts are closed, and when the temperature is lower than the set temperature threshold, the switch contacts are disconnected. This is mainly to avoid long-term cooling and abnormal cooling that causes the battery temperature to drop. At this time, the low-temperature circuit breaker is used for redundant protection and automatically disconnects the cooler. That is, when the battery temperature is lower than the set temperature threshold due to abnormal cooling, the switch contacts of the low-temperature circuit breaker are disconnected, and the switch contacts are set at the BMS output end and the cooling drive end of the TMS controller, so the signal output by the BMS will be disconnected to the cooling drive end. Since the signal at the cooling drive end is disconnected, the TMS controller prohibits the output control of the cooler, thereby avoiding long-term abnormal cooling. The low-temperature circuit breaker here also plays a role of redundant protection.

[0021] like Figure 1As shown, taking the setting of four temperature switches and four low-temperature circuit breakers as an example, in fact, the number of temperature switches and circuit breakers can be set as many as needed; the contacts of the temperature switches are K1-K4, and the contacts of the low-temperature circuit breakers are S1-S4; the BMS output end will output the heating drive signal and the cooling drive signal, respectively, and send them to the heating drive end and the cooling drive end of the TMS controller, and connect K1-K4 or S1-S4 in series in the connected loop, so that the circuit connection is completed, and then the temperature switch and the low-temperature circuit breaker are respectively set at different positions inside the battery pack to sense the real-time temperature of the battery and control the corresponding contact switch. Select four modules that are relatively in the middle position in the module of the battery box, and mount four temperature switches on the outer surface of the module without affecting the normal installation of the battery, connect the BMS and TMS with a control harness, and connect the four temperature switches in series in the wake-up signal of the BMS controlling the TMS.

[0022] Under normal circumstances, the BMS wakes up the TMS for heating. During the process of TMS heating the battery pack, if the battery is heated unevenly or the battery temperature rises too quickly, the BMS and TMS do not detect that the temperature is too high, and the TMS continues to heat the battery pack. When the temperature reaches 60 degrees, the temperature switch installed in the battery pack will actively disconnect, cutting off the start signal from the BMS to the TMS, making the TMS inoperative. When the temperature in the battery pack drops to 50 degrees, the BMS resumes heating control of the TMS. This battery thermal management method of controlling TMS heating can effectively prevent the TMS from heating continuously and causing the battery pack temperature to be too high.

[0023] In a preferred embodiment of the present application, when abnormal heating or abnormal cooling occurs, due to the presence of the temperature switch and the low-temperature circuit breaker, the battery will not be abnormally heated or cooled, but the user still needs to be reminded because this abnormal heating state requires inspection or maintenance and a reminder needs to be issued; the fault here can be compared with the voltage signal at the output end of the BMS and the voltage signal input to the heating drive end and the cooling drive end of the TMS controller. The abnormality is determined by comparing the voltage, and the corresponding voltage is collected by the voltage acquisition module. Here, a dedicated voltage transformer or a resistor voltage divider can be used to collect the voltage signal. The voltage acquisition module detects the voltage signal at the output end of the BMS and the voltage signals at the heating drive end and the cooling drive end of the TMS thermal management system respectively; the output end of the voltage acquisition module is connected to the vehicle controller, and the vehicle controller is used to drive the alarm. The on-board controller can be some controller units in the vehicle including but not limited to BMS, VCU, domain control, etc.; the on-board controller determines whether a fault occurs based on the voltage signal at the output end of the BMS and the voltage signals at the heating drive end and cooling drive end of the TMS thermal management system. If so, an alarm signal is sent through the alarm, wherein the alarm signal can be a horn sound or an alarm signal displayed on the on-board display screen, that is, the alarm is the on-board horn or the on-board display screen.

[0024] This embodiment also provides an automobile, wherein the battery pack of the automobile adopts the anti-failure battery thermal management control system in the above embodiment to perform thermal management control on the battery.

[0025] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A battery thermal management control system for preventing failure, comprising a BMS, a temperature sensor, and a TMS thermal management system, wherein the temperature sensor is used to collect temperature data of the battery, and its output end is connected to the input end of the BMS, and the output end of the BMS outputs a heating or cooling drive signal to the drive end of the TMS thermal management system, and the TMS thermal management system is used to drive the operation of the heater or cooler; characterized in that: The control system further comprises a temperature switch, which is arranged in the battery module, and the switch contacts of the temperature switch are arranged in series between the output end of the BMS and the heating drive end of the TMS thermal management system.

2. A battery thermal management control system for preventing failure as claimed in claim 1, characterized in that There are multiple temperature switches, which are respectively arranged at different positions of the battery module. The switch contacts of the multiple temperature switches are connected in series in sequence and then connected in series between the output end of the BMS and the heating drive end of the TMS thermal management system.

3. A battery thermal management control system for preventing failure as claimed in claim 1, characterized in that :The control system also includes a low-temperature circuit breaker, which is arranged in the battery module, and the switch contacts of the low-temperature circuit breaker are arranged in series between the output end of the BMS and the cooling drive end of the TMS thermal management system.

4. A failure-proof battery thermal management control system as claimed in claim 3, characterized in that There are multiple low-temperature circuit breakers, which are respectively arranged at different positions of the battery module. The switch contacts of the multiple low-temperature circuit breakers are connected in series in sequence and then connected in series between the output end of the BMS and the cooling drive end of the TMS thermal management system.

5. A failure-proof battery thermal management control system according to any one of claims 1 to 4, characterized in that: The control system also includes a voltage acquisition module, which detects the voltage signal of the BMS output end and the voltage signals of the heating drive end and the cooling drive end of the TMS thermal management system respectively; the output end of the voltage acquisition module is connected to the vehicle controller, and the vehicle controller is used to drive the alarm.

6. A battery thermal management control system for preventing failure as claimed in claim 5, characterized in that: The alarm is a vehicle-mounted speaker or a vehicle-mounted display screen.

7. A vehicle, characterized in that: The vehicle includes a failure-proof battery thermal management control system as described in any one of claims 1-6.

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