Battery module dynamic measurement system based on energy storage charging pile

Abstract

The invention discloses a battery module dynamic measurement system based on an energy storage charging pile, and the system dynamically recognizes the number of battery modules of the energy storage charging pile through a software strategy to determine the total number of battery cells, and obtains reliable battery cell data through the multi-mode measurement of a front-end chip and a software filtering algorithm. A diagnosis strategy is designed according to a chip safety manual, module fault information is detected and reported to the central control MCU, and finally the working state of the charging pile is decided according to the fault level. Compared with the prior art, the system has the advantages of compatibility and cost, can meet the diversified requirements of customers on battery module configuration, and reduces the development and operation cost; the measurement performance is improved, the external interference is reduced, and the measurement accuracy and real-time performance are improved; safety performance is enhanced, potential safety hazards are found and processed in time, safe operation of the battery module is guaranteed, and public safety risks are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage charging piles, and particularly relates to a dynamic measurement system for battery modules based on an energy storage charging pile. Background Art

[0002] As an important device for solving problems such as peak-valley differences in demand during the charging process of electric vehicles, power grid load balancing, and energy consumption, the performance of energy storage charging piles is crucial. The battery management system (BMS) is responsible for monitoring and managing energy storage devices to ensure their safety and performance. In this process, the performance of the battery module measurement, such as flexibility, accuracy, and safety, directly affects the overall development cost, operating performance, and safety guarantee of the energy storage charging pile.

[0003] Currently, there are many problems in the state detection of battery modules in energy storage charging piles:

[0004] 1. Inaccurate data: The measured data such as voltage, current, and capacity do not match the actual situation. This is caused by reasons such as errors in measuring instruments, instability of measuring circuits, and problems with the battery modules themselves. Inaccurate data will affect the judgment of the battery module state, and further affect the normal operation and maintenance of the energy storage charging pile.

[0005] 2. Safety issues: The battery modules may have safety issues such as overheating, leakage, and short circuit during the test. If safety measures are not in place and abnormal tests are not stopped in time, it is extremely easy to cause safety accidents, threatening the safety of personnel and equipment.

[0006] 3. Software and hardware version matching issues: Energy storage charging piles can be customized and installed with different types and quantities of battery packs according to customer requirements. However, the existing market mostly uses a fixed software and hardware matching combination method. This method cannot meet the flexible selection needs of customers and is not conducive to reducing the development cost and operating cost of energy storage charging piles.

[0007] Therefore, we propose a new dynamic measurement system for battery modules based on an energy storage charging pile. Summary of the Invention

[0008] The main purpose of the present invention is to propose a dynamic measurement system for battery modules based on an energy storage charging pile, which can effectively solve the problems in the background art.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is: A dynamic measurement system for battery modules based on an energy storage charging pile, including the following steps:

[0010] A. Dynamically identify the number of battery modules in the energy storage charging pile through a software strategy to determine the total number of battery cells in the battery pack;

[0011] B. Collect parameters such as voltage, current, and temperature of the battery modules of the energy storage charging pile, and calculate reliable cell data through software filtering algorithms;

[0012] C. Detect the fault information of the energy storage charging pile module through software fault detection and diagnosis programs, and report it;

[0013] D. Determine the working state of the energy storage charging pile according to the fault information.

[0014] As a further description of the above technical solution, the dynamic identification of the number of battery modules of the energy storage charging pile through software strategies is achieved by adopting a strategy of dynamically allocating the serial numbers of the front-end acquisition chips according to the performance of the front-end acquisition chips.

[0015] As a further description of the above technical solution, the collection of parameters such as voltage, current, and temperature of the battery modules of the energy storage charging pile, and the calculation of reliable cell data through software filtering algorithms, specifically means measuring the terminal voltage values of the cells through the application measurement mode, periodic measurement mode, and synchronous strategy mode of the front-end chip, and performing mean filtering to obtain the final reliable terminal voltage values.

[0016] As a further description of the above technical solution, the detection of the fault information of the energy storage charging pile module through software fault detection and diagnosis programs is realized by designing the open circuit, short circuit, low voltage overvoltage, leakage monitoring of the battery module and the diagnosis strategy of the voltage acquisition module of the front-end chip according to the safety manual of the chip, and the fault information is reported to the central control MCU of the energy storage system.

[0017] As a further description of the above technical solution, the determination of the working state of the energy storage charging pile according to the fault information is based on the diagnostic fault level to decide whether to continue the measurement program of the charging pile module.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Compatibility and cost advantages: It helps to dynamically identify the number of battery modules of the energy storage charging pile, meet the diverse needs of customers for the types and quantities of battery modules. It reduces the software development and operation costs, improves the compatibility and application scope of the BMS system, and enhances the market competitiveness of the product.

[0020] 2. Improvement of measurement performance: It improves the accuracy and real-time performance of battery module measurement, and effectively reduces the noise interference of the external environment. This not only improves the use performance of the energy storage charging pile, but also extends its service life, providing a better user experience for users.

[0021] 3. Enhanced safety performance: The diagnostic level of the energy storage charging pile is improved, enabling timely detection and handling of safety hazards in the battery module to ensure the safe operation of the battery module. The cycle life performance of the battery pack is enhanced, reducing the public safety risks caused by the energy storage charging pile and contributing to social safety and stability. Description of the Drawings

[0022] Figure 1 Shows the process of dynamically allocating the front-end chip serial number. Detailed Implementation Manner

[0023] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the detailed implementation manners.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Please refer to Figure 1, the present invention provides a technical solution: a dynamic measurement system for battery modules of an energy storage charging pile, including the following steps: Dynamically identifying the number of battery modules of the energy storage charging pile through a software strategy to determine the total number of battery cells in the battery pack is achieved by adopting a strategy of dynamically allocating the serial numbers of the front-end chips according to the performance of the front-end acquisition chips.; Collecting parameters such as voltage, current, and temperature of the battery modules of the energy storage charging pile, and calculating reliable battery cell data through a software filtering algorithm. Specifically, the terminal voltage value of the battery cells is measured through the application measurement mode, periodic measurement mode, and synchronous strategy mode of the front-end chip, and the final reliable terminal voltage value is obtained through mean filtering; Detecting and reporting the fault information of the energy storage charging pile module through a software fault detection and diagnosis program is achieved by designing open-circuit, short-circuit, low-voltage overvoltage, leakage monitoring of the battery module, and a diagnostic strategy for the voltage acquisition module of the front-end chip according to the safety manual of the chip, and the fault information is reported to the central control MCU of the energy storage system; Deciding the working state of the energy storage charging pile according to the fault information is based on determining whether the measurement program of the charging pile module continues according to the diagnostic fault level.

[0027] Embodiment 1: Dynamically identifying the number of battery modules

[0028] Based on the research on the performance of the front-end acquisition chips, the embodiments of the present invention provide a strategy for dynamically allocating the serial numbers of the front-end chips, as Figure 1 shown. In actual operation, when the energy storage charging pile is connected to battery packs with different configurations, the system operates according to the Figure 1 shown process. For example, in a certain application scenario, the customer selects a battery pack containing a specific number of battery modules. The system successfully dynamically identifies the number of battery modules in the battery pack through a series of operations such as TPL wake-up, delay, and CID judgment, providing a basis for subsequent accurate measurement and management of the battery modules. In the Figure 1 shown process, first, TPL wake-up is performed, followed by a delay greater than 1 ms, and then it is judged whether CID exists. If it does not exist, global reset is performed; if it exists, CIDO is read, and after a 5 ms delay, NCID is assigned to CIDO and CID is read back. If the read-back is completed within 1 s and all CIDs exist, it is further judged whether it is the last node. If not, NCID is incremented; if so, the BCC register is initialized, the bus switch is closed, and subsequent operations are continued. Through this process, the dynamic allocation of the serial numbers of the front-end chips is realized, and thus the number of battery modules in the battery pack selected by the customer can be dynamically identified.

[0029] Embodiment 2: Collecting and processing measurement parameters

[0030] Measure the terminal voltage value of the battery cell through the application measurement mode, periodic measurement mode, and synchronization strategy mode of the front-end chip, and perform mean filtering to obtain the final reliable terminal voltage value. During the actual measurement process, taking a certain model of energy storage charging pile as an example, the front-end chip measures the terminal voltage of the battery cell in different modes. The application measurement mode is used to obtain real-time voltage data, the periodic measurement mode ensures the continuity of the data, and the synchronization strategy mode ensures the synchronization of each measurement point. Perform mean filtering on the measured data to remove noise interference and obtain an accurate and reliable terminal voltage value, providing precise data support for evaluating the state of the battery module.

[0031] Embodiment 3: Fault Detection and Reporting

[0032] According to the safety manual of the chip, design the open circuit, short circuit, low voltage overvoltage, leakage monitoring of the battery module, and the diagnostic strategy for the voltage acquisition module of the front-end chip, and report it to the central control MCU of the energy storage system. During the actual operation process, when an open circuit occurs in the battery module, the system can quickly detect it, judge the fault type and level according to the preset diagnostic strategy, and report the fault information to the central control MCU in a timely manner. After receiving the fault information, the central control MCU can take corresponding measures, such as stopping the work of the relevant module, to avoid the expansion of the fault and ensure the safe operation of the energy storage charging pile.

[0033] Embodiment 4: Decision on Working Status

[0034] Decide whether to continue the measurement program of the charging pile module according to the diagnosed fault level. In practical applications, when it is detected that there is a minor fault in the battery module, such as the voltage of a certain battery cell is slightly lower than the normal range and the fault level is judged to be low, the system will record the fault information and continue the measurement program, while prompting the staff to check and maintain; when a serious fault is detected, such as a short circuit in the battery module and the fault level is high, the system immediately stops the measurement program and takes corresponding safety measures, such as cutting off the power supply, to prevent safety accidents.

[0035] It should be noted that the present invention is a dynamic measurement system for battery modules based on an energy storage charging pile. Compared with the existing dynamic measurement system for battery modules based on an energy storage charging pile, the present invention can

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery module dynamic measurement system based on an energy storage charging pile, characterized in that: The following steps are involved: A. Dynamically identify the number of battery modules in the energy storage charging pile through software strategies and determine the total number of cells in the battery pack; B. Collect parameters such as voltage, current and temperature of the energy storage charging pile battery module, and calculate reliable battery cell data through software filtering algorithm; C. Detect and report energy storage charging pile module fault information through software fault detection and diagnosis procedures; D. Determine the working status of the energy storage charging pile based on the fault information.

2. The battery module dynamic measurement system based on the energy storage charging pile according to claim 1 is characterized in that: The dynamic identification of the number of battery modules of the energy storage charging pile by software strategy is achieved based on the performance of the front-end acquisition chip and by adopting a strategy of dynamically allocating the serial number of the front-end chip.

3. The battery module dynamic measurement system based on the energy storage charging pile according to claim 1 is characterized in that: The energy storage charging pile battery module voltage, current, temperature and other parameters are collected, and reliable battery cell data is calculated through a software filtering algorithm. Specifically, the terminal voltage value of the battery cell is measured through the application measurement mode, periodic measurement mode and synchronization strategy mode of the front-end chip, and mean filtering is performed to obtain the final reliable terminal voltage value.

4. The battery module dynamic measurement system based on the energy storage charging pile according to claim 1 is characterized in that: The detection of energy storage charging pile module fault information through software fault detection and diagnostic procedures is achieved by designing the open circuit, short circuit, low voltage overvoltage, leakage monitoring of the battery module and the front-end chip voltage acquisition module diagnostic strategy according to the chip safety manual, and the fault information is reported to the central control MCU of the energy storage system.

5. The battery module dynamic measurement system based on the energy storage charging pile according to claim 1 is characterized in that: The determination of the working state of the energy storage charging pile according to the fault information is to determine whether the measurement procedure of the charging pile module should continue according to the diagnosis fault level.

Images