Automobile retired power battery echelon utilization monitoring system

Abstract

The utility model relates to a monitoring system for echelon utilization of an automobile retired power battery, and belongs to the technical field of power batteries. A monitoring system for echelon utilization of an automobile retired power battery comprises a battery pack, a power conversion module and an output port which are connected in sequence, and power transmission and discharge functions are achieved. The power conversion module comprises a plurality of sub-modules, and each sub-module comprises an IGBT switch and a gate driver; the positive electrode and the negative electrode of a battery unit in the battery pack are respectively connected to the collector electrode and the emitter electrode of the IGBT switch; the output end of the gate driver is connected to the gate of the IGBT switch, and the ground end of the gate driver is connected to the emitter of the IGBT switch. The power conversion module is designed into a plurality of independent sub-modules, and the system can flexibly adapt to different load requirements in a dynamic electromagnetic echelon utilization process through a parallel connection mode, a series connection mode or a series-parallel hybrid connection mode of the plurality of sub-modules, and provides optimal current and voltage capacities.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, specifically relating to a monitoring system for the cascade utilization of retired automotive power batteries. Background Technology

[0002] New energy vehicles have become an important task in modern industrial development. However, after a period of use, the usable capacity of the power battery packs in electric vehicles will gradually decrease to 60% or less of the original capacity, at which point these battery packs will no longer be suitable for use in electric vehicles.

[0003] These retired power battery packs still possess high safety and electrical performance; directly scrapping them would result in a significant waste of resources. Therefore, tiered recycling of retired power batteries is a feasible and environmentally friendly solution. Currently, the following shortcomings exist in the tiered utilization of retired power batteries:

[0004] First, the existing system lacks efficient monitoring and control methods for battery energy management, resulting in low energy utilization; at the same time, there are safety hazards when the current, voltage or temperature is abnormal or too high.

[0005] Second: Existing circuit systems lack flexible current and voltage regulation capabilities when dealing with different load demands during tiered utilization, making it difficult to achieve optimal energy output. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model provides a monitoring system for the cascade utilization of retired automotive power batteries. By introducing a high-efficiency battery monitoring module and a flexible power conversion module, it achieves flexible current and voltage regulation, safe and reliable operation stability, and good scalability, significantly improving the cascade utilization effect of retired power batteries.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A monitoring system for the cascade utilization of retired automotive power batteries includes a battery pack, a power conversion module, and an output port connected in sequence to realize power transmission and discharge functions; it also includes a battery monitoring module connected to the battery pack for monitoring the operating status of the battery pack; the output terminal of the battery monitoring module is communicatively connected to the power conversion module to output control signals.

[0009] The power conversion module includes several sub-modules, each sub-module containing an IGBT switch and a gate driver; the positive and negative terminals of the battery cells in the battery pack are connected to the collector and emitter of the IGBT switch, respectively; the output terminal of the gate driver is connected to the gate of the IGBT switch, and the ground terminal of the gate driver is connected to the emitter of the IGBT switch.

[0010] Several sub-modules are combined in parallel, series, or a combination of series and parallel to adjust the optimal total current and voltage according to load requirements.

[0011] Preferably, when several sub-modules are combined in a series-parallel hybrid manner, the positive and negative terminals of each series circuit are connected to the collector and emitter of an IGBT switch, respectively; the positive and negative terminals of each parallel circuit are connected to the collector and emitter of an IGBT switch, respectively.

[0012] Preferably, the battery monitoring module mainly consists of an LTC6811-2 and a microcontroller. The LTC6811-2 is connected to each battery cell in the battery pack via its VC interface for voltage monitoring of each cell. The LTC6811-2 communicates with the microcontroller via its SPI interface. Multiple LTC6811-2s are connected in parallel to the microcontroller, allowing for individual addressing of each LTC6811-2. The output of the microcontroller is connected to a gate driver for instruction control.

[0013] Preferably, it also includes several current sensors, which are installed at the output of the circuit nodes of the power conversion module to monitor the output current of each branch in real time, and the output signal of the current sensor is connected to the ADC input of the microcontroller.

[0014] Preferably, the module also includes several thermistors, which are located near the power conversion module and connected to the ADC input terminal of the microcontroller.

[0015] The beneficial effects of this utility model are:

[0016] 1. The power conversion module is designed as multiple independent sub-modules. Through parallel, series or series-parallel hybrid connection of multiple sub-modules, the system can flexibly adapt to different load requirements in the process of power electromagnetic cascade utilization and provide the best current and voltage capacity.

[0017] 2. By combining the LTC6811-2 and a microcontroller, and with the addition of other monitoring devices such as current sensors and thermistors, the system can monitor and control multiple signals from multiple battery cells. When abnormal current or voltage is detected, or when the module temperature is too high, the system will automatically disconnect from the load to prevent system damage or safety accidents.

[0018] 3. Through real-time monitoring and intelligent control, efficient energy management of battery cells is achieved, and current and voltage output are optimized. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a structural block diagram of the present invention.

[0021] Figure 2 This is a simplified circuit diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the series-parallel hybrid connection structure of the power conversion module in this utility model.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1-Battery pack, 101-Battery cell, 2-Power conversion module, 21-Sub-module, 201-IGBT switch, 202-Gate driver, 3-Battery monitoring module, 301-LTC6811-2, 302-Microcontroller. Detailed Implementation

[0025] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Please see Figures 1-2 As shown, a monitoring system for the cascade utilization of retired automotive power batteries includes a battery pack 1, a power conversion module 2, and an output port connected in sequence to realize the transmission and discharge functions; it also includes a battery monitoring module 3, which is connected to the battery pack 1 and is used to monitor the operating status of the battery pack 1; the output terminal of the battery monitoring module 3 is communicatively connected to the power conversion module 2 to output control signals.

[0027] The power conversion module 2 includes several sub-modules 21, each sub-module 21 containing an IGBT switch 201 and a gate driver 202; the positive and negative terminals of the battery cells 101 in the battery pack 1 are connected to the collector and emitter of the IGBT switch 201, respectively; the output terminal of the gate driver 202 is connected to the gate of the IGBT switch 201, and the ground terminal of the gate driver 202 is connected to the emitter of the IGBT switch 201; the several sub-modules 21 are combined in parallel, series, or a combination of series and parallel to adjust the optimal total current and voltage according to the load requirements.

[0028] Specifically, the IGBT switch 201 can be an MG75Q2YS40 switch device; the gate driver 202 can be an I R2110 driver.

[0029] It also includes a battery monitoring module 3, which mainly consists of an LTC6811-2 (301) and a microcontroller 302. The LTC6811-2 (301) is connected to each battery cell 101 of the battery pack 1 through the VC interface for voltage monitoring of each battery cell 101. The LTC6811-2 communicates with the microcontroller 302 through the SPI interface. Multiple LTC6811-2s are connected in parallel to the microcontroller 302, allowing individual addressing of each LTC6811-2. The output of the microcontroller 302 is connected to the gate driver 202 to implement command control.

[0030] Specifically, the LTC6811-2 is a multi-cell battery pack monitor that can measure the voltage of up to 12 series-connected battery cells. The LTC6811-2 also features passive charge balancing for each battery cell and individual PWM duty cycle control for each battery cell.

[0031] Please see Figure 3 As shown, in an optional embodiment, when the several sub-modules 21 are combined in a series-parallel hybrid manner, the positive and negative terminals of each series circuit are respectively connected to the collector and emitter of an IGBT switch 201; the positive and negative terminals of each parallel circuit are respectively connected to the collector and emitter of an IGBT switch 201.

[0032] As an optional embodiment, several current sensors are also included. These current sensors are installed at the output terminals of the circuit nodes of the power conversion module 2 to monitor the output current of each branch in real time, and the output signals of the current sensors are connected to the ADC input terminal of the microcontroller 302. Specifically, the current sensors may be ACS712 sensors.

[0033] As an optional embodiment, several thermistors are also included: placed near the power conversion module 2 to monitor the temperature in real time, and the output signals of the thermistors are connected to the ADC input of the microcontroller 302.

[0034] Working principle and process: 1. Voltage monitoring: The LTC6811-2 is connected to each battery cell 101 via the VC interface to monitor the battery voltage in real time. The monitoring data is transmitted to the microcontroller 302 via the SPI interface, and the microcontroller 302 processes and analyzes the data.

[0035] II. Current and Temperature Monitoring: The current sensor monitors the output current of each branch in real time and transmits the signal to the ADC input of the microcontroller 302. The thermistor monitors the temperature of the power conversion module 2 in real time and transmits the signal to the ADC input of the microcontroller 302.

[0036] III. Power Conversion and Control: According to the load requirements, the microcontroller 302 outputs control signals to the gate driver 202 through the GPIO or PWM port, and then the gate driver 202 adjusts the gate voltage of the IGBT switch 201 to achieve current and voltage regulation.

[0037] IV. Protection Mechanism: When abnormal current, voltage or excessive temperature is detected, the microcontroller 302 will shut down the corresponding IGBT switch through the gate driver 202, disconnect the battery cell from the load, and protect the system safety.

[0038] In the optional embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0039] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A monitoring system for the cascade utilization of retired automotive power batteries, characterized in that: It includes a battery pack, a power conversion module, and an output port connected in sequence; it also includes a battery monitoring module, which is connected to the battery pack and used to monitor the operating status of the battery pack; the output of the battery monitoring module is communicatively connected to the power conversion module and outputs control signals. The power conversion module includes several sub-modules, each sub-module containing an IGBT switch and a gate driver; the positive and negative terminals of the battery cells in the battery pack are connected to the collector and emitter of the IGBT switch, respectively; the output terminal of the gate driver is connected to the gate of the IGBT switch, and the ground terminal of the gate driver is connected to the emitter of the IGBT switch. Several sub-modules are combined in parallel, series, or a combination of series and parallel to adjust the optimal total current and voltage according to load requirements.

2. The monitoring system for the cascade utilization of retired automotive power batteries according to claim 1, characterized in that: When several sub-modules are combined in a series-parallel hybrid manner, the positive and negative terminals of each series circuit are connected to the collector and emitter of an IGBT switch, respectively; the positive and negative terminals of each parallel circuit are connected to the collector and emitter of an IGBT switch, respectively.

3. The monitoring system for the cascade utilization of retired automotive power batteries according to claim 1, characterized in that: The battery monitoring module mainly consists of an LTC6811-2 and a microcontroller. The LTC6811-2 is connected to each battery cell in the battery pack via its VC interface for voltage monitoring of each cell. The LTC6811-2 communicates with the microcontroller via its SPI interface. Multiple LTC6811-2s are connected in parallel to the microcontroller for individual addressing of each LTC6811-2. The output of the microcontroller is connected to a gate driver for instruction control.

4. A monitoring system for the cascade utilization of retired automotive power batteries according to any one of claims 1-3, characterized in that: It also includes several current sensors, which are installed at the output of the circuit nodes of the power conversion module to monitor the output current of each branch in real time, and the output signal of the current sensor is connected to the ADC input of the microcontroller.

5. A monitoring system for the cascade utilization of retired automotive power batteries according to any one of claims 1-3, characterized in that: It also includes several thermistors, which are located near the power conversion module and connected to the ADC input terminal of the microcontroller.

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