Battery management system capable of monitoring internal resistance of battery based on active equalization

Abstract

The invention relates to the technical field of battery management systems, in particular to a battery management system capable of monitoring battery internal resistance based on active equalization. The technical problems are as follows: when a battery management system is used, a battery with higher voltage is generally discharged in a resistor discharging mode, the electric quantity is released in a heat form, and when passive equalization is carried out, the equalization current is smaller, the equalization efficiency is lower, and energy waste and heat generation exist. According to the technical scheme, the active equalization-based battery management system capable of monitoring the internal resistance of the battery comprises an equalization control module; compared with a traditional battery management system, electric quantity is released in a heat form, balancing current is small, balancing efficiency is low, and energy waste and heat generation exist during passive balancing, the battery management system transfers part of energy in the batteries with high electric quantity to the batteries with low electric quantity in an active balancing mode, so that the energy is saved, and the battery management efficiency is improved. And energy loss and equalization time can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management systems, and in particular to a battery management system capable of monitoring battery internal resistance based on active equalization. Background Art

[0002] The battery management system is a complex system used to monitor and manage the status of battery packs. It plays a vital role in battery applications, especially in electric vehicles, energy storage systems, and portable electronic devices. BMS can monitor the voltage, current, temperature and other key parameters of each single cell in the battery pack in real time. These parameters are crucial for evaluating the health and performance of the battery. However, when using a battery management system, the battery with a higher voltage is generally discharged through resistance discharge, releasing electricity in the form of heat. During passive balancing, the balancing current is small, the balancing efficiency is low, and there are problems of energy waste and heat generation. Summary of the invention

[0003] In order to overcome the problem that when using a battery management system, batteries with higher voltages are generally discharged through resistance discharge, releasing electricity in the form of heat. During passive balancing, the balancing current is small, the balancing efficiency is low, and there are problems of energy waste and heat generation.

[0004] The technical solution of the present invention is: a battery management system capable of monitoring battery internal resistance based on active balancing, comprising:

[0005] Data acquisition module: used to collect parameters such as voltage, current, temperature and internal resistance of the battery pack in real time;

[0006] Communication module: used to transmit the battery pack information collected by the data acquisition module;

[0007] Data preprocessing module: used to preprocess the data transmitted by the communication module;

[0008] Data analysis module: used to analyze the data processed by the data preprocessing module;

[0009] Balance control module: used to control the opening and closing of the circuit according to the analysis results of the data analysis module;

[0010] Data storage module: used to store and back up the data collected by the data acquisition module and the data analysis module;

[0011] Data feedback module: used to regularly generate test reports to provide feedback to staff.

[0012] Preferably, the data acquisition module is provided with multiple groups of sensors for detecting the real-time status of the battery pack, such as voltage, current, temperature, internal resistance and other data, and can collect various key parameters of the battery pack in real time and accurately.

[0013] Preferably, the communication module includes a signal transmission module and a signal conversion module, which are used to receive and convert the key parameters of the battery pack collected in the data acquisition module, and upload the status information and data of the battery pack to the upper machine position and data preprocessing module.

[0014] Preferably, the data preprocessing module is used to perform preliminary processing on the real-time status of the battery pack transmitted by the data transmission module, remove interference data in the collected data, reduce the impact of the interference part on the sensitivity of the battery management system, and transmit the preprocessed data to the data analysis module.

[0015] Preferably, the data analysis module is used to accept the data cleaned by the data preprocessing module, and evaluate the overall status of the battery pack based on the cleaned data, including the remaining capacity, health status, internal resistance change trend of the battery, etc., and predict the future performance trends and potential problems of the battery through analysis of historical data and current data.

[0016] Preferably, the balancing control module is used to control the opening and closing of the active balancing circuit according to the results provided by the data analysis module, so as to achieve the balance of power between the single cells in the battery pack, so as to ensure the voltage and power balance in the battery pack.

[0017] Preferably, when the balancing control module controls the active balancing circuit, the following steps are included:

[0018] S11: Formulate a suitable balancing strategy according to the current state of the battery pack and the target balancing requirement;

[0019] S12: by controlling the switch matrix network and other hardware circuits, the charging and discharging operations of the single battery are realized to achieve the purpose of balancing;

[0020] S13: During the balancing process, real-time monitoring of battery status changes, such as voltage, current, temperature and other parameters, is performed to ensure the safety and effectiveness of the balancing process;

[0021] S14: According to the balancing effect and data feedback, optimize the balancing strategy and parameter settings to improve the balancing efficiency and accuracy.

[0022] Preferably, the balancing control module can transfer part of the energy in the battery with higher charge to the battery with lower charge through energy transfer, reducing the heat loss generated by resistive discharge, thereby improving the energy efficiency of the entire battery pack. At the same time, it can continuously monitor and adjust the voltage of each cell in the battery pack, so that the voltage difference between the cells is kept within a small range, thereby improving the consistency of the battery pack.

[0023] Preferably, the data storage module includes an information resource management submodule and a cloud storage terminal, which integrates the collected battery pack information and the analyzed real-time status of the battery pack, manages and stores the integrated data, and backs up the data storage to the cloud.

[0024] Preferably, when the data storage module backs up and stores data, the following method is included:

[0025] A11: Create a master document based on the corresponding date on the cloud platform;

[0026] A12: Create classification sub-documents in the main document based on the classification information;

[0027] A13: compress and encrypt the collected battery pack information and the analyzed real-time status of the battery pack for backup;

[0028] A14: The compressed and encrypted battery pack information and the analyzed real-time status of the battery pack are placed in a sub-document.

[0029] Preferably, the data storage module facilitates permanent storage of various data required by the system, and can effectively back up the collected battery pack information and analyzed real-time status of the battery pack. The data storage module can effectively improve the response speed and processing efficiency of the system.

[0030] Preferably, the data feedback module is used to provide feedback on the collected battery pack information and the analyzed battery pack real-time status at a set time, and the system can be regularly upgraded and maintained to facilitate staff to check the battery internal resistance.

[0031] Beneficial effects of the present invention:

[0032] 1. Compared with the traditional battery management system, the battery with higher voltage is generally discharged by resistance discharge, and the electricity is released in the form of heat. In passive balancing, the balancing current is small, the balancing efficiency is low, and there are problems of energy waste and heat generation. This battery management system transfers part of the energy from the battery with higher power to the battery with lower power through active balancing to achieve voltage balance of the entire battery pack, which can effectively reduce energy loss and balancing time;

[0033] 2. The balancing control module can transfer part of the energy from the battery with higher power to the battery with lower power through energy transfer, reducing the heat loss generated by resistance discharge, thereby improving the energy efficiency of the entire battery pack. At the same time, it can continuously monitor and adjust the voltage of each cell in the battery pack, so that the voltage difference between the cells is kept within a small range, thereby improving the consistency of the battery pack;

[0034] 3. The data storage module facilitates permanent storage of various data required by the system, and can effectively back up the collected battery pack information and analyzed real-time status of the battery pack. The data storage module can effectively improve the response speed and processing efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The circuit topology diagram of the BMS battery management system of the present invention is shown;

[0036] Figure 2 What is shown is a topological schematic diagram of a cell internal resistance detection circuit based on active balancing of the present invention;

[0037] Figure 3 Shown is a schematic diagram of a battery monitoring chip detection circuit with integrated AC impedance function of the present invention;

[0038] Figure 4 Shown is a schematic diagram of the equalization control and internal resistance detection process of the present invention; DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] See also Figure 1-4 The present invention provides an embodiment: a battery management system capable of monitoring battery internal resistance based on active balancing, comprising:

[0041] Data acquisition module: used to collect parameters such as voltage, current, temperature and internal resistance of the battery pack in real time;

[0042] Communication module: used to transmit the battery pack information collected by the data acquisition module;

[0043] Data preprocessing module: used to preprocess the data transmitted by the communication module;

[0044] Data analysis module: used to analyze the data processed by the data preprocessing module;

[0045] Balance control module: used to control the opening and closing of the circuit according to the analysis results of the data analysis module;

[0046] Data storage module: used to store and back up the data collected by the data acquisition module and the data analysis module;

[0047] Data feedback module: used to regularly generate test reports to provide feedback to staff.

[0048] Preferably, the data acquisition module is provided with multiple groups of sensors for detecting the real-time status of the battery pack, such as voltage, current, temperature, internal resistance and other data, and can collect various key parameters of the battery pack in real time and accurately.

[0049] Preferably, the communication module includes a signal transmission module and a signal conversion module, which are used to receive and convert the key parameters of the battery pack collected in the data acquisition module, and upload the status information and data of the battery pack to the upper machine position and data preprocessing module.

[0050] Preferably, the data preprocessing module is used to perform preliminary processing on the real-time status of the battery pack transmitted by the data transmission module, remove interference data in the collected data, reduce the impact of the interference part on the sensitivity of the battery management system, and transmit the preprocessed data to the data analysis module.

[0051] Preferably, the data analysis module is used to accept the data cleaned by the data preprocessing module, and evaluate the overall status of the battery pack based on the cleaned data, including the remaining capacity, health status, internal resistance change trend of the battery, etc., and predict the future performance trends and potential problems of the battery through analysis of historical data and current data.

[0052] Preferably, the balancing control module is used to control the opening and closing of the active balancing circuit according to the results provided by the data analysis module, so as to achieve the balance of power between the single cells in the battery pack, so as to ensure the voltage and power balance in the battery pack.

[0053] Preferably, when the balancing control module controls the active balancing circuit, the following steps are included:

[0054] S11: Formulate a suitable balancing strategy according to the current state of the battery pack and the target balancing requirement;

[0055] S12: by controlling the switch matrix network and other hardware circuits, the charging and discharging operations of the single battery are realized to achieve the purpose of balancing;

[0056] S13: During the balancing process, real-time monitoring of battery status changes, such as voltage, current, temperature and other parameters, is performed to ensure the safety and effectiveness of the balancing process;

[0057] S14: According to the balancing effect and data feedback, optimize the balancing strategy and parameter settings to improve the balancing efficiency and accuracy.

[0058] Preferably, the balancing control module can transfer part of the energy in the battery with higher charge to the battery with lower charge through energy transfer, reducing the heat loss generated by resistive discharge, thereby improving the energy efficiency of the entire battery pack. At the same time, it can continuously monitor and adjust the voltage of each cell in the battery pack, so that the voltage difference between the cells is kept within a small range, thereby improving the consistency of the battery pack.

[0059] Preferably, the data storage module includes an information resource management submodule and a cloud storage terminal, which integrates the collected battery pack information and the analyzed real-time status of the battery pack, manages and stores the integrated data, and backs up the data storage to the cloud.

[0060] Preferably, when the data storage module backs up and stores data, the following method is included:

[0061] A11: Create a master document based on the corresponding date on the cloud platform;

[0062] A12: Create classification sub-documents in the main document based on the classification information;

[0063] A13: compress and encrypt the collected battery pack information and the analyzed real-time status of the battery pack for backup;

[0064] A14: The compressed and encrypted battery pack information and the analyzed real-time status of the battery pack are placed in a sub-document.

[0065] Preferably, the data storage module facilitates permanent storage of various data required by the system, and can effectively back up the collected battery pack information and analyzed real-time status of the battery pack. The data storage module can effectively improve the response speed and processing efficiency of the system.

[0066] Preferably, the data feedback module is used to provide feedback on the collected battery pack information and the analyzed battery pack real-time status at a set time, and the system can be regularly upgraded and maintained to facilitate staff to check the battery internal resistance.

[0067] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A battery management system that can monitor battery internal resistance based on active balancing; Features: Included are: Data acquisition module: used to collect parameters such as voltage, current, temperature and internal resistance of the battery pack in real time; Communication module: used to transmit the battery pack information collected by the data acquisition module; Data preprocessing module: used to preprocess the data transmitted by the communication module; Data analysis module: used to analyze the data processed by the data preprocessing module; Balance control module: used to control the opening and closing of the circuit according to the analysis results of the data analysis module; Data storage module: used to store and back up the data collected by the data acquisition module and the data analysis module; Data feedback module: used to regularly generate test reports to provide feedback to staff.

2. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 1, Features: The data acquisition module is equipped with multiple sets of sensors for detecting the real-time status of the battery pack, such as voltage, current, temperature, internal resistance and other data, and can collect various key parameters of the battery pack in real time and accurately.

3. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 2, Features: The communication module includes a signal transmission module and a signal conversion module, which are used to receive and convert the key parameters of the battery pack collected in the data acquisition module, and upload the status information and data of the battery pack to the upper machine position and data preprocessing module.

4. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 3, Features: The data preprocessing module is used to perform preliminary processing on the real-time status of the battery pack transmitted by the data transmission module, remove interference data in the collected data, reduce the impact of the interference part on the sensitivity of the battery management system, and transmit the preprocessed data to the data analysis module.

5. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 4, Features: The data analysis module is used to receive the data cleaned by the data preprocessing module, and evaluate the overall status of the battery pack based on the cleaned data, including the remaining capacity, health status, internal resistance change trend, etc. of the battery. By analyzing historical data and current data, it predicts the future performance trends and potential problems of the battery.

6. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 5, Features: The balancing control module is used to control the opening and closing of the active balancing circuit according to the results provided by the data analysis module, so as to achieve the balance of power between the single cells in the battery pack and ensure the voltage and power balance in the battery pack.

7. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 6, Features: When the balancing control module controls the active balancing circuit, the following steps are included: S11: Formulate a suitable balancing strategy according to the current state of the battery pack and the target balancing requirement; S12: by controlling the switch matrix network and other hardware circuits, the charging and discharging operations of the single battery are realized to achieve the purpose of balancing; S13: During the balancing process, real-time monitoring of battery status changes, such as voltage, current, temperature and other parameters, is performed to ensure the safety and effectiveness of the balancing process; S14: According to the balancing effect and data feedback, optimize the balancing strategy and parameter settings to improve the balancing efficiency and accuracy.

8. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 7, Features: The data storage module includes an information resource management submodule and a cloud storage terminal. It integrates the collected battery pack information and the analyzed real-time status of the battery pack, manages and stores the integrated data, and backs up the data storage to the cloud.

9. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 8, Features: When the data storage module backs up and stores data, the following methods are included: A11: Create a master document based on the corresponding date on the cloud platform; A12: Create classification sub-documents in the main document based on the classification information; A13: compress and encrypt the collected battery pack information and the analyzed real-time status of the battery pack for backup; A14: The compressed and encrypted battery pack information and the analyzed real-time status of the battery pack are placed in a sub-document.

10. A battery management system capable of monitoring battery internal resistance based on active balancing according to claim 9, Features: The data feedback module is used to provide feedback on the collected battery pack information and the analyzed battery pack real-time status at a set time. The system can be regularly upgraded and maintained to facilitate staff to check the battery internal resistance.

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