Lead-acid battery consistency screening system

Abstract

The utility model relates to a consistency screening system for lead-acid batteries. The consistency screening system comprises a charging and discharging converter module, a single battery detection module, a battery information acquisition module and a system control unit, the single batteries are electrically connected with a power grid through the charging and discharging converter module; the temperature detection end of the single battery detection module is electrically connected with the single battery and is suitable for detecting temperature data of the single battery; a voltage detection circuit of the single battery detection module is electrically connected with the single battery and is suitable for detecting the voltage of the single battery; the output end of the single battery detection module is connected with the input end of the battery information acquisition module, and the output end of the battery information acquisition module is electrically connected with the input end of the system control unit. The output end of the system control unit is connected with the input end of the charging and discharging converter module, and the charging and discharging converter module is suitable for converting the charging state or the discharging state of the single battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a lead-acid battery consistency screening system. Background Art

[0002] With the increasing demand for battery power and capacity, single lead-acid batteries, due to their inherent performance limitations, often struggle to meet the high power and high capacity requirements in practical applications. Therefore, single lead-acid batteries need to be combined in series or parallel to form battery packs. However, the performance parameters of these multiple single lead-acid batteries often vary. Significant differences can lead to battery pack failure during cycling. Therefore, it is essential to screen single lead-acid batteries with similar performance to create a consistent battery pack. During the charge and discharge process, the operating voltage of a single lead-acid battery characterizes its performance. Cells with higher voltages overcharge during charging and act as loads during discharge, consuming energy from other cells. A lead-acid battery consistency screening system is proposed. This system is suitable for performing voltage testing on single cells during operation, enabling personnel to screen these cells based on voltage parameters. Summary of the Invention

[0003] In view of this, the present application proposes a lead-acid battery consistency screening system, which is suitable for detecting the voltage of a single battery during operation, and includes: a charge and discharge converter module, a single battery detection module, a battery information acquisition module and a system control unit;

[0004] The single battery is electrically connected to the grid through the charge and discharge converter module;

[0005] The temperature detection terminal of the single cell detection module is electrically connected to the single cell and is suitable for detecting the temperature data of the single cell; the voltage detection circuit of the single cell detection module is electrically connected to the single cell and is suitable for detecting the voltage of the single cell;

[0006] The output end of the single battery detection module is electrically connected to the input end of the battery information acquisition module, and is suitable for sending voltage data and temperature data to the battery information acquisition module;

[0007] The output end of the battery information acquisition module is electrically connected to the input end of the system control unit, and is suitable for collecting voltage data and temperature data and sending them to the system control unit; the first output end of the system control unit is electrically connected to the input end of the charge and discharge converter module, and is suitable for converting the charging state or discharging state of the single cell through the charge and discharge converter module.

[0008] In a possible implementation, a processing unit is further included; a second output terminal of the system control unit is electrically connected to an input terminal of the processing unit, and is adapted to send the collected voltage data and temperature data to the processing unit.

[0009] In one possible implementation, the processing unit includes a display module and a data processing module; the input end of the data processing module is electrically connected to the output end of the system control unit, and is suitable for storing the collected voltage data and temperature data, and screening the consistency of the single cells based on the collected voltage data and temperature data; the display module is electrically connected to the data processing module, and is suitable for displaying the data screened by the data processing module on the single cells.

[0010] In a possible implementation, there are more than two single-cell battery detection modules; and the output ends of the two or more single-cell battery detection modules are electrically connected to the input end of the battery information acquisition module.

[0011] In one possible implementation, the charge-discharge converter module is an energy storage converter.

[0012] Beneficial effects of this application

[0013] By setting up a single cell detection module, the lead-acid battery consistency screening system of the present application can simultaneously detect the voltage and temperature of the single cell. By simultaneously obtaining the voltage and temperature data of the single cell, it can more comprehensively and accurately evaluate the performance status of the single cell, avoiding the one-sidedness and inaccuracy of the evaluation caused by the measurement of a single parameter, improving the accuracy and reliability of battery consistency screening, and simultaneously detecting the voltage and temperature parameters, reducing the time and operation steps for separate measurements, and greatly improving the efficiency of the detection process.

[0014] Compared with the existing technology, the lead-acid battery consistency screening system of the present application can accurately detect the operating temperature and charge and discharge voltage of each single cell by setting up a single cell detection module, and evaluate the performance of each single cell based on the data of the operating temperature and charge and discharge voltage of each single cell detected, so as to eliminate the single cells that do not meet the performance standards, and then connect the single cells that meet the performance standards in series and parallel, to ensure that the single cells in the battery pack can share similar voltages during the charge and discharge process, reduce the single cell capacity attenuation of the battery pack due to large performance differences between the single cells, and extend the service life of the battery pack.

[0015] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0017] Figure 1 A schematic diagram showing the structure of the lead-acid battery consistency screening system of the present application is shown;

[0018] Figure 2 A flow chart of the lead-acid battery consistency screening system of the present application is shown. DETAILED DESCRIPTION

[0019] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0020] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0022] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0024] A lead-acid battery consistency screening system is suitable for detecting and screening the consistency of single cells, and is characterized by comprising: a charge and discharge converter module 100, a single cell detection module 200, a battery information acquisition module 300, and a system control unit 400; the single cells are electrically connected to the power grid through the charge and discharge converter module 100; the temperature detection terminal of the single cell detection module 200 is electrically connected to the single cell and is suitable for detecting the temperature data of the single cell; the voltage detection circuit of the single cell detection module 200 is electrically connected to the single cell and is suitable for detecting the voltage of the single cell; the output terminal of the single cell detection module 200 is electrically connected to the input terminal of the battery information acquisition module 300, and is suitable for sending voltage data and temperature data to the battery information acquisition module 300; the output terminal of the battery information acquisition module 300 is electrically connected to the input terminal of the system control unit 400, and is suitable for collecting the voltage data and temperature data and sending them to the system control unit 400; the first output terminal of the system control unit 400 is electrically connected to the input terminal of the charge and discharge converter module 100, and is suitable for converting the charge state or discharge state of the single cell through the charge and discharge converter module 100.

[0025] It should be noted here that the charge and discharge converter module 100 is suitable for converting the AC power of the power grid into DC power to charge the single cell battery; or inverting the DC power of the single cell battery into AC power to feed it back to the power grid. The temperature detection end of the single cell battery detection module 200 and the voltage detection circuit of the single cell battery detection module 200 are both electrically connected to the positive and negative poles of the single cell battery, thereby ensuring that the single cell battery detection module 200 can accurately measure the voltage and temperature of the single cell battery during the charging and discharging process, reducing data deviations caused by external interference or measurement errors. The voltage detection circuit of the single cell battery detection module 200 is suitable for detecting the voltage value of the single cell battery during the charging and discharging process, providing a basis for subsequent data analysis and consistency evaluation. The temperature detection end of the single cell battery detection module 200 is suitable for measuring the temperature of the single cell battery during the charging and discharging process. The output ends of the single-cell battery detection module 200 are electrically connected to the input ends of the battery information acquisition module 300. The single-cell battery detection module 200 can transmit the detection data to the battery information acquisition module 300 in real time, thereby ensuring the timeliness and accuracy of the data. The battery information acquisition module 300 is suitable for collecting and collating the voltage data and temperature data detected by the single-cell battery detection module 200, and then transmitting the data to the system control unit 400 by the battery information acquisition module 300, thereby ensuring that the system control unit 400 can receive comprehensive and accurate battery status information; the system control unit 400 is suitable for controlling the charge and discharge converter module 100 to charge and discharge the single cell battery. The system control unit 400 can accurately control the current, voltage and other parameters of the single cell battery during the charging and discharging process, thereby improving the accuracy of the screening results.

[0026] By setting up a single cell detection module 200, the lead-acid battery consistency screening system of the present application can simultaneously detect the voltage and temperature of the single cell during the charging and discharging process. By simultaneously obtaining the voltage and temperature data of the single cell, the performance status of the single cell can be evaluated more comprehensively and accurately, avoiding the one-sidedness and inaccuracy of the evaluation caused by the measurement of a single parameter, improving the accuracy and reliability of battery consistency screening, and simultaneously detecting the voltage and temperature parameters, reducing the time and operation steps for separate measurements, thereby greatly improving the efficiency of the detection process.

[0027] When there are differences in the voltages of the cells in a battery pack, the cells with higher voltages will be overcharged during charging and become loads during discharging, thereby consuming the energy of other cells. This unbalanced charging and discharging process will cause uneven heat distribution inside the battery pack. Cells with higher voltages may generate more heat during the charging and discharging process, thereby exacerbating the uneven temperature distribution inside the battery pack. As the temperature rises, the chemical reaction rate inside the battery accelerates, resulting in an increased rate of battery capacity decay, shortening the service life of the battery pack. Compared with the prior art, the lead-acid battery consistency screening system of the present application accurately detects the operating temperature and charge and discharge voltage of each cell by setting a cell detection module, and evaluates the performance of each cell based on the data of the operating temperature and charge and discharge voltage of each cell detected, so as to eliminate cells that do not meet the performance standards and then combine cells that meet the performance standards to ensure that the cells in the battery pack can share similar voltages during the charging and discharging process, reducing the cell capacity decay of the battery pack due to large performance differences between cells, and extending the service life of the battery pack.

[0028] Preferably, a lead-acid battery detection module model I03S-2V in the prior art is used. The single-cell detection module 200 is internally provided with a temperature sensor and a voltage detection circuit. The detection end of the temperature sensor is connected to the positive and negative electrodes of the single cell via wires, and the voltage detection circuit is electrically connected to the positive and negative electrodes of the single cell via wires.

[0029] Furthermore, the single cell detection module 200 is connected to the battery information acquisition module 300 via an RS485 serial port. The RS485 interface of the single cell detection module 200 is connected to the first RS485 interface of the battery information acquisition module 300.

[0030] In one possible implementation, the system control unit 400 can control the different states of the charge-discharge converter module 100 according to different detection stages. In the present application, the different detection stages can include two types, one is the detection stage when charging the single cell, and the other is the detection stage when the single cell is discharging. When it is necessary to perform charging stage detection on the single cell, the system control unit 400 controls the charge-discharge converter module 100 to convert the AC power of the grid into DC power to charge the single cell. When it is necessary to perform discharging stage detection on the single cell, the system control unit 400 controls the charge-discharge converter module 100 to invert the DC power of the single cell into AC power and feed it back to the grid. Preferably, the charge-discharge converter module 100 adopts the energy storage converter in the prior art.

[0031] Further, such as Figure 2 As shown, during the charging and discharging process of a single battery, the system control unit can also adjust the output power of the charge-discharge converter module based on the temperature and voltage data collected by the battery information acquisition module. If the received temperature and voltage data meet the preset protection values, the output power of the charge-discharge converter module is not adjusted. If the received temperature and voltage data do not meet the preset protection values, the output power of the charge-discharge converter module is adjusted. The preset protection values ​​include temperature and voltage protection values, and are manually set based on the performance of the selected single battery cells.

[0032] Specifically, such as Figure 2 The figure shows a flow chart for screening the homogeneity of single cells. When the temperature detected by the temperature detection device is greater than the temperature protection value, the system control unit reduces the output power of the charge-discharge converter module. When the temperature detected by the temperature detection device is less than the temperature protection value, the system control unit increases the output power of the charge-discharge converter module. When the voltage detected by the voltage detection device is greater than the voltage protection value, the system control unit reduces the output power of the charge-discharge converter module. When the voltage detected by the voltage detection device is less than the voltage protection value, the system control unit increases the output power of the charge-discharge converter module. It should be noted that if either the received temperature data or the received voltage data does not meet the preset quality requirements, the system control unit changes the output power of the charge-discharge converter module.

[0033] The system control unit adjusts the power design of the charge and discharge converter module according to temperature and voltage data, so that the single cell battery is always in a suitable working state during the charge and discharge process, avoiding the failure or performance degradation of the single cell battery caused by excessive or insufficient power of the charge and discharge converter module.

[0034] In one possible implementation, the battery information acquisition module 300 is connected to the system control unit 400 via an RS485 serial port. The second RS485 interface of the battery information acquisition module 300 is connected to the second RS485 interface of the system control unit 400.

[0035] Preferably, the battery information collection module 300 adopts a battery information collector of model I03T in the prior art.

[0036] In one possible implementation, the system control unit 400 is communicatively connected to the charge-discharge converter module 100. It should be noted that, in the communication connection design, during the charge-discharge process, the charge-discharge converter module 100 will send feedback of the actual charging current and voltage status to the system control unit 400. The system control unit 400 adjusts the control strategy based on this data to achieve more efficient charge-discharge management. The RS485 interface of the charge-discharge converter module 100 is connected to the first RS485 interface of the system control unit 400, and the CAN interface of the charge-discharge converter module 100 is connected to the CAN interface of the system control unit 400.

[0037] In one possible implementation, a processing unit is further included; the second output terminal of the system control unit 400 is electrically connected to the input terminal of the processing unit, and is suitable for sending the collected voltage data and temperature data to the processing unit. It should be noted here that the processing unit receives the voltage and temperature data from the system control unit 400 and screens the consistency of the single cells based on the received data. By screening the single cells for consistency, it is convenient for staff to combine single cells with similar performance to form a more balanced battery pack, which helps to improve the overall performance and service life of the battery pack, reduce the risk of failure of the entire battery pack due to failure of individual single cells, improve the charging and discharging efficiency of the battery pack, extend the service life of the battery, and reduce maintenance costs.

[0038] Preferably, the system control unit 400 is connected to the processing unit via Ethernet, and the system control unit 400 adopts a central controller of the prior art model INEMS-100.

[0039] In one possible implementation, the processing unit includes a display module 600 and a data processing module 500. The input of the data processing module 500 is electrically connected to the output of the system control unit 400 and is adapted to store the aggregated voltage and temperature data and screen the consistency of the individual cells based on the aggregated voltage and temperature data. The display module 600 is electrically connected to the data processing module 500 and is adapted to display the data screened by the data processing module 500 on the individual cells. It should be noted that the data processing module 500 stores the voltage and temperature data aggregated by the system control unit 400, thereby ensuring the integrity and continuity of the data and preventing data loss or corruption during transmission.

[0040] like Figure 2 As shown, when the data processing module 500 screens the consistency of the single cells based on the collected voltage data and temperature data, it can calculate the deviation value between the single cells and screen the single cells for uniformity based on the deviation value. The calculation of the deviation value between the single cells includes obtaining the detected voltage values ​​of the single cells, calculating the average voltage value of the single cells based on the detected voltage values, and using the difference between the detected voltage values ​​and the average voltage value as the deviation value.

[0041] Specifically, such as Figure 2 The figure shows a flowchart for screening the homogeneity of single cells. When screening the homogeneity of single cells based on deviation values, this is done based on a preset deviation threshold. The deviation value of each single cell is compared with the preset deviation threshold. When the deviation value of a single cell is less than the preset deviation threshold, the performance of the single cell meets the standard and can continue to be used or proceed to the next step. When the deviation value of a single cell is greater than the preset deviation threshold, the performance of the single cell does not meet the standard. Single cells with non-standard performance need to be replaced, repaired, or further analyzed. Preferably, the preset deviation threshold is 20mV.

[0042] The input end of the display module 600 is connected to the output end of the data processing module 500. The display module 600 can intuitively display the information of the single cells that do not meet the performance standards screened by the data processing module 500, so that the operator can quickly locate the single cells that do not meet the performance standards without having to manually browse through a large amount of data or perform complex calculations, thereby improving the efficiency of single cell consistency screening and shortening the time for single cell detection and screening.

[0043] In one possible implementation, two or more single-cell battery detection modules 200 are provided; the output terminals of the two or more single-cell battery detection modules 200 are electrically connected to the input terminals of the battery information collection module 300. It should be noted that each single-cell battery is connected to a single-cell battery detection module 200, and two or more single-cell batteries are electrically connected in series. The two or more single-cell battery detection modules 200 can simultaneously test multiple single-cell batteries, shortening detection time and improving screening efficiency.

[0044] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A lead-acid battery consistency screening system, suitable for voltage detection of single cells during operation, characterized in that: include: Charge and discharge converter module, single cell detection module, battery information acquisition module and system control unit; The single battery is electrically connected to the power grid through the charge and discharge converter module; The temperature detection terminal of the single cell detection module is electrically connected to the single cell and is suitable for detecting the temperature data of the single cell; the voltage detection circuit of the single cell detection module is electrically connected to the single cell and is suitable for detecting the voltage of the single cell; The output end of the single battery detection module is electrically connected to the input end of the battery information acquisition module, and is suitable for sending voltage data and temperature data to the battery information acquisition module; The output end of the battery information acquisition module is electrically connected to the input end of the system control unit, and is suitable for collecting the voltage data and the temperature data and sending them to the system control unit; the first output end of the system control unit is electrically connected to the input end of the charge and discharge converter module, and is suitable for converting the charging state or discharging state of the single cell through the charge and discharge converter module.

2. The lead-acid battery consistency screening system according to claim 1, characterized in that: Also included is a processing unit; The second output terminal of the system control unit is electrically connected to the input terminal of the processing unit, and is suitable for sending the collected voltage data and the temperature data to the processing unit.

3. The lead-acid battery consistency screening system according to claim 2, characterized in that: The processing unit includes a display module and a data processing module; The input end of the data processing module is electrically connected to the output end of the system control unit, and is suitable for storing the collected voltage data and the temperature data; The display module is electrically connected to the data processing module and is suitable for displaying the data screened by the data processing module on the single cells.

4. The lead-acid battery consistency screening system according to claim 1, characterized in that: The single cell battery detection modules are provided with more than two; The output ends of the two or more single-cell battery detection modules are electrically connected to the input end of the battery information acquisition module.

5. The lead-acid battery consistency screening system according to claim 4, characterized in that: The charge and discharge converter module is an energy storage converter.

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