A thermal management system for a power battery

Abstract

The utility model discloses a power battery thermal management system, which relates to the technical field of power batteries. The system includes: a BMS module, a TMS module, an ECU module and a thermal management switch; the thermal management switch is electrically connected to the ECU module, and the thermal management switch is used to send a thermal management startup instruction to the ECU module to make it enter a working mode; the ECU module is electrically connected to the BMS module, and the ECU module is used to receive the thermal management startup instruction, and send a thermal management request instruction to the BMS module when it is determined that the power battery pack meets the thermal management requirements; the BMS module is electrically connected to the TMS module, and the BMS module is used to receive the thermal management request instruction, and then select whether to send a heating or cooling instruction to the TMS module according to whether the power battery pack has a fault that affects the thermal management; the TMS module is used to control the heating or cooling module after receiving the heating or cooling instruction to realize the temperature control of the power battery pack. By adding the ECU module, the thermal management switch and the thermal management system, the temperature of the power battery can be quickly adjusted, and one-key thermal management can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a power battery thermal management system. Background Art

[0002] Driven by energy storage technology, the market share of new energy heavy trucks is increasing rapidly. Due to the special usage scenarios of new energy heavy trucks, the required power battery capacity is larger. In order to maintain normal operating temperature, the thermal management energy consumption will also increase accordingly. In order to minimize the power consumed by thermal management, a temperature adjustment range (15-45°C, the following data on power battery temperature and performance are all based on ternary lithium batteries as an example) will be set to meet the normal charging and discharging needs of power batteries.

[0003] At present, power batteries have technologies such as fast charging, super charging, and reverse discharge. Their usage scenarios are not limited to daily driving discharge and ordinary charging. The power battery is required to have an optimal temperature range for different working modes (fast charging requires 20-35°C). However, the current battery thermal management system uses a wide range to cover all situations during thermal management, abandoning the efficient state of the initial stage of the power battery in a specific mode, and cannot quickly enter the optimal temperature range of the power battery during thermal management. Utility Model Content

[0004] In order to solve the existing technical problems, the utility model provides a power battery thermal management system, including: a BMS module, a TMS module, an ECU module and a thermal management switch;

[0005] The thermal management switch is electrically connected to the ECU module, and the thermal management switch is used to send a thermal management start instruction to the ECU module to enable it to enter a working mode;

[0006] The ECU module is electrically connected to the BMS module, and the ECU module is used to receive a thermal management start instruction and send a thermal management request instruction to the BMS module when it is determined that the power battery pack meets the thermal management requirements;

[0007] The BMS module is electrically connected to the TMS module, and the BMS module is used to select whether to send a heating or cooling instruction to the TMS module after receiving a thermal management request instruction according to whether the power battery pack has a fault that affects thermal management;

[0008] The TMS module is used to control the heating or cooling module to achieve temperature control of the power battery pack after receiving a heating or cooling instruction.

[0009] Furthermore, it also includes: a power module;

[0010] The power module is electrically connected to the ECU module, the BMS module and the TMS module, and is used to provide a 24V power supply.

[0011] Furthermore, it also includes: an indication module, which is electrically connected to the ECU module and is used to display the operating status of the power battery thermal management system.

[0012] Furthermore, the indication module is an indicator light or a display device on a vehicle.

[0013] Furthermore, the ECU module is a controller on the vehicle that is in the same CAN network as the BMS module and the TMS module.

[0014] Furthermore, the power battery pack is electrically connected to the BMS module and the TMS module.

[0015] Furthermore, it also includes: an automotive wiring harness for connecting high and low voltage circuits.

[0016] The beneficial effects of the technical solution provided by the utility model are:

[0017] First of all, by adding an ECU module and a thermal management switch to the utility model in conjunction with the original thermal management system, the temperature of the power battery can be quickly adjusted to meet more efficient energy consumption in different working modes of the power battery. It is highly compatible with the original thermal management system, and adding a few hardware devices can add a one-click thermal management function to the vehicle.

[0018] Secondly, adding an indication module can display the operating status of the power battery thermal management system.

[0019] Furthermore, the power battery thermal management system can achieve faster charging speed while ensuring battery safety, shortening the charging time of new energy heavy trucks and improving charging efficiency.

[0020] In addition, before charging, the vehicle driver only needs to turn on the thermal management switch a few minutes in advance. No other operation is required. The power battery automatically enters the fast charging temperature range, which improves the utilization rate of the power battery, saves time, and allows the user to manually start or stop the thermal management system at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit structure diagram of a power battery thermal management system provided by the utility model;

[0022] Figure 2 This is an external control circuit of a power battery thermal management system provided by the utility model;

[0023] Figure 3This is a flow chart of a one-key thermal management control power battery thermal management system provided by the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] A power battery thermal management system includes: a thermal management switch, a power module, an ECU module, a BMS module, a TMS module, a group of power battery packs, an automobile wiring harness (a high-voltage power wiring harness and a low-voltage signal wiring harness) and an indication module.

[0027] The thermal management switch is electrically connected to the ECU module through a low-voltage signal harness. The thermal management start instruction can be manually provided through the thermal management switch, and the power battery can be quickly put into the required working mode through the thermal management switch, for example, the fast charging working mode. The thermal management switch can also allow the user to manually start or stop the thermal management system at any time. The ECU module can be any controller on the vehicle that is in the same CAN network as the BMS module and the TMS module; the indication module is electrically connected to the ECU module through a low-voltage signal harness. The indication module can be an indicator light or be replaced by other display devices on the vehicle. The status can not only display the status of one-key thermal management, but also display multiple custom states such as real-time battery temperature and working mode.

[0028] The BMS module is electrically connected to the ECU module, the TMS module is electrically connected to the BMS module, the BMS module is electrically connected to the power battery pack through a low-voltage signal harness, the TMS module is electrically connected to the cooling / heating module through a low-voltage signal harness, and the cooling / heating module is electrically connected to the power battery pack through a high-voltage power harness; the ECU module receives the thermal management start instruction, and sends a thermal management request instruction to the BMS module when it determines that the power battery pack meets the thermal management requirements. The BMS module serves as an intermediate controller of the thermal management control loop, and receives signals from the ECU module, the TMS module, and the power battery pack at the same time. The BMS module reports the monitored power battery pack data to the ECU The module executes the thermal management request instruction of the ECU module, and chooses whether to send the heating or cooling instruction to the TMS module according to whether the power battery pack has a fault that affects the thermal management; the TMS module receives the heating or cooling instruction issued by the BMS module, and controls the cooling / heating module to control the temperature of the power battery pack until the temperature of the power battery pack meets the temperature set by the BMS module; among them, the cooling / heating module and the TMS module are collectively referred to as the water cooling unit in new energy heavy trucks, which consists of a low-voltage controller and a high-voltage execution device. Since the temperature control has a certain hysteresis, the water inlet temperature of the water cooling unit should be used to control whether it meets the set temperature during the execution process.

[0029] The power module is electrically connected to the ECU module, BMS module and TMS module, and is used to provide 24V low-voltage power to the ECU module, BMS module and TMS module, and also provide a high-level or low-level detection source for the system. The selection of high-level or low-level detection source is determined by the level detection characteristics of the I / O port of the ECU module. In this system, a high-level detection source signal is used.

[0030] It should be noted that see Figure 3 Taking the fast charging mode in the working mode as an example, the process of one-key thermal management control of the power battery thermal management system is explained, which specifically includes the following steps:

[0031] Turn on the thermal management switch, and the indicator light starts flashing, indicating that the ECU module has received the thermal management start command and the system is ready. The ECU module receives data such as the temperature of the water inlet of the cooler on the bus to determine whether the power battery is in the optimal temperature range for fast charging. If the power battery is not in the optimal temperature range and thermal management is required, the ECU module continues to receive SOC data on the bus to determine whether the battery power is greater than 15%. When the battery power meets the thermal management requirements, the power battery starts heating / cooling. After 10 minutes, the indicator light is always on, indicating the end of thermal management. Turn off the thermal management switch, the indicator light goes out, and the entire process ends.

[0032] When the power battery requires thermal management but the power level does not meet the conditions or the power battery is in the optimum temperature range, the thermal management ends and the indicator light starts to stay on; if the heating / cooling time exceeds 10 minutes and the power battery still has not reached the appropriate charging temperature range, considering the time efficiency, the system automatically stops heating / cooling, and the thermal management end indicator light changes from flashing to stay on; during the heating / cooling process (the indicator light flashes), the thermal management process can be ended by manually turning off the thermal management switch.

[0033] It should also be noted that the above is the thermal management logic for the fast charging mode, and the thermal management requirements of other working modes of the power battery can also be added, such as overcharging, reverse discharge, etc.

[0034] It is worth mentioning that, firstly, the addition of an ECU module, a thermal management switch and an indication module in the utility model in conjunction with the original thermal management system can quickly adjust the temperature of the power battery, so as to meet the more efficient energy consumption of the power battery in different working modes; secondly, it can achieve faster charging speed while ensuring battery safety, shorten the charging time of new energy heavy trucks, and improve charging efficiency; furthermore, before charging, the vehicle driver only needs to turn on the thermal management switch a few minutes in advance, without any other operation, the power battery automatically enters the fast charging temperature range, improves the utilization rate of the power battery, saves time, and allows the user to manually start or stop the thermal management system at any time; in addition, it is highly compatible with existing thermal management systems. Since the utility model is designed on the basis of existing thermal management systems, it is highly compatible with the original thermal management system, and adding a few hardware devices can add a one-key thermal management function to the vehicle.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power battery thermal management system, characterized in that: include: BMS module, TMS module, ECU module and thermal management switch; The thermal management switch is electrically connected to the ECU module, and the thermal management switch is used to send a thermal management start instruction to the ECU module to enable it to enter a working mode; The ECU module is electrically connected to the BMS module, and the ECU module is used to receive a thermal management start instruction and send a thermal management request instruction to the BMS module when it is determined that the power battery pack meets the thermal management requirements; The BMS module is electrically connected to the TMS module, and the BMS module is used to select whether to send a heating or cooling instruction to the TMS module after receiving a thermal management request instruction according to whether the power battery pack has a fault that affects thermal management; The TMS module is used to control the heating or cooling module to achieve temperature control of the power battery pack after receiving a heating or cooling instruction.

2. The power battery thermal management system according to claim 1, characterized in that: Also includes: Power module; The power module is electrically connected to the ECU module, the BMS module and the TMS module, and is used to provide a 24V power supply.

3. The power battery thermal management system according to claim 1, characterized in that: Also includes: The indicator module is electrically connected to the ECU module and is used to display the operating status of the power battery thermal management system.

4. The power battery thermal management system according to claim 3, characterized in that: The indication module is an indicator light or a display device on a vehicle.

5. The power battery thermal management system according to claim 1, characterized in that: The ECU module is a controller on the vehicle that is in the same CAN network as the BMS module and the TMS module.

6. The power battery thermal management system according to claim 1, characterized in that: The power battery pack is electrically connected to the BMS module and the TMS module.

7. The power battery thermal management system according to claim 6, characterized in that: Also includes: Automotive wiring harness, used to connect high and low voltage circuits.

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