Charging pile with battery connection group detection module

Abstract

The utility model discloses a charging pile with a battery connection group detection module, and belongs to the technical field of charging piles. Comprising a charging pile, the charging pile comprises a power supply module used for charging a lithium battery pack and a battery connection group detection module, the battery connection group detection module comprises a single-chip microcomputer module and a detection unit, and a first control signal end of the single-chip microcomputer module is electrically connected with a signal receiving end of the power supply module; the signal receiving end of the single-chip microcomputer module is electrically connected with the detection unit, the detection unit comprises a current sensor and a voltage sensor, the battery connection group detection module is additionally arranged in the charging pile, and the battery connection group detection module receives the voltage and the current of the lithium battery pack measured by the current sensor and the voltage sensor through the single-chip microcomputer; and the series connection condition of each lithium battery module in the lithium battery pack is judged according to the total voltage and current, so that the consistency and safety of each battery module in the charging process are ensured, and the fault phenomena such as failure of a single battery module or short circuit of the battery pack are prevented.

Description

Technical Field

[0001] The present application relates to the technical field of charging piles, and specifically to a charging pile with a battery connection group detection module. Background Technique

[0002] A charging pile is a facility specifically used to provide charging services for the batteries of electric bicycles, electric motorcycles, and other electric vehicles, aiming to achieve a convenient, efficient, and safe charging experience.

[0003] After retrieval, the publication number is CN215868131U, which discloses a charging pile safety monitoring system including a control host and multiple detection terminals. The detection terminals include a leakage detection part, a temperature sensor, a relay, a main control unit, and a prompt part. By setting one or more detection terminals on the charging pile to detect whether the shell and handle of the charging pile are electrified, detect the temperature of the shell, and send it to the control host through a wireless communication module; the control host remotely configures the main control unit through wireless communication to adjust the threshold for controlling the relay to disconnect, or directly sends a control signal to control the sound and light alarm and the relay, thereby reminding the user and directly cutting off the power; the utility model can be installed on the existing charging pile, and can effectively monitor the leakage risk of the charging pile to reduce the electric shock risk of the user.

[0004] However, the existing charging piles cannot effectively monitor the series connection status between each battery module in the lithium battery pack of the battery-powered vehicle to be charged, resulting in some battery modules may not be correctly connected or malfunction, thereby affecting the charging efficiency and safety of the entire battery pack. At the same time, the lack of real-time monitoring of the current and voltage of the battery pack makes it impossible to detect abnormal situations of the battery in time, such as overvoltage, overcurrent, or charging imbalance, etc., thus increasing the risk of battery damage or fire.

[0005] Therefore, it is necessary to provide a charging pile with a battery connection group detection module to solve the above problems.

[0006] It should be noted that the above information disclosed in this background technical part is only used to understand the background technology of the concept of the present application, and therefore, it may include information that does not constitute the prior art. Content of the Utility Model

[0007] The purpose of the present utility model is to provide a charging pile with a battery connection group detection module to solve the problems raised in the above background technology.

[0008] The technical solution adopted by the present application to solve its technical problems is:

[0009] A charging pile with a battery connection group detection module, including a charging pile. The charging pile includes a power supply module for charging a lithium battery pack and a battery connection group detection module. The battery connection group detection module includes a single-chip microcomputer module and a detection unit. The first control signal terminal of the single-chip microcomputer module is electrically connected to the signal receiving terminal of the power supply module, and the signal receiving terminal of the single-chip microcomputer module is electrically connected to the detection unit. The detection unit includes a current sensor and a voltage sensor;

[0010] The input end of the power supply module is electrically connected to the mains electricity. The output end of the power supply module is connected in series with the current sensor and then supplies power to the battery pack through a charging line and a charging interface. The input end of the voltage sensor is electrically connected to the output end of a voltage dividing circuit. The input end of the voltage dividing circuit is connected in parallel to the positive and negative terminal posts of the battery pack through the charging line.

[0011] Preferably, the current sensor includes a Hall effect current sensor U1, a capacitor C1, a capacitor C2, a sliding rheostat RV1, an operational amplifier U2, a resistor R1, and a light-emitting diode D1. The IP+ terminal and IP- terminal of the Hall effect current sensor U1 are connected in series on the line from the output end of the power supply module to the charging line. The VCC terminal of the Hall effect current sensor U1 is connected to the +5V power supply and one end of the capacitor C2. The VIOUT terminal of the Hall effect current sensor U1 is connected to the inverting input terminal of the operational amplifier U2. The VIOUT terminal of the Hall effect current sensor U1 is also electrically connected to the signal receiving terminal of the single-chip microcomputer module. The FILTER terminal of the Hall effect current sensor U1 is connected to one end of the capacitor C1. The other end of the capacitor C1, the other end of the capacitor C2, and the GND of the Hall effect current sensor U1 are all grounded. The two ends of the sliding rheostat RV1 are respectively connected to the +5V power supply and the ground terminal. The adjustment terminal of the sliding rheostat RV1 is connected to the non-inverting input terminal of the operational amplifier U2. The output end of the operational amplifier U2 is connected to one end of the resistor R1. The other end of the resistor R1 is connected to one end of the light-emitting diode D1. The other end of the light-emitting diode D1 is grounded.

[0012] Preferably, the voltage sensor includes a voltage monitoring IC chip U29. A capacitor C101 is connected in parallel to the VIN+ terminal and the VIN- terminal of the voltage monitoring IC chip U29. The VIN+ terminal and the VIN- terminal of the voltage monitoring IC chip U29 are electrically connected to the output terminal of a voltage dividing circuit. The VS of the voltage monitoring IC chip U29 is connected to a 3.3V power supply. The SDA terminal of the voltage monitoring IC chip U29 is connected to one end of a resistor R11. The SCL terminal of the voltage monitoring IC chip U29 is connected to one end of a resistor R10. The SDA terminal and the SCL terminal of the voltage monitoring IC chip U29 are respectively electrically connected to the signal receiving terminals of a single-chip microcomputer module. The other ends of the resistor R10 and the resistor R11 are commonly connected to a 3.3V power supply.

[0013] Preferably, the second control signal terminal of the single-chip microcomputer module is electrically connected to an alarm module.

[0014] Preferably, the signal output terminal of the single-chip microcomputer module is electrically connected to a display module through a digital-to-analog conversion module.

[0015] Preferably, the single-chip microcomputer module uses a single-chip microcomputer of the ESP32 model.

[0016] The beneficial effects of the present application are as follows:

[0017] By adding a battery connection group detection module to the charging pile, the battery connection group detection module receives the voltage and current of the lithium battery pack measured by a current sensor and a voltage sensor through a single-chip microcomputer, and judges the series connection situation of each lithium battery module in the lithium battery pack according to the total voltage and current magnitude, so as to ensure the consistency and safety of each battery module during the charging process, prevent faults such as the failure of a single battery module or the short circuit of the battery pack. When the voltage of a certain battery module is abnormal or the current is not within the set range, the charging can be cut off in time to protect the safety of the battery, ensure the timely discovery of faults such as overvoltage, overcurrent, and charging imbalance, and can effectively avoid the damage of the battery pack or the occurrence of safety accidents.

[0018] In addition to the purposes, features, and advantages described above, the present application has other purposes, features, and advantages. The following will refer to the drawings to further elaborate on the present application in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The schematic diagrams forming a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application.

[0020] In the drawings:

[0021] Figure 1 is a system block diagram of a charging pile with a battery connection group detection module according to the present utility model;

[0022] Figure 2 is the circuit diagram of the current sensor of the present utility model;

[0023] Figure 3 is the circuit diagram of the voltage sensor of the present utility model Specific embodiments

[0024] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will describe this application in detail with reference to the drawings and in conjunction with the embodiments.

[0025] In order to enable those skilled in the art of this technology to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of this application.

[0026] Please refer to Figures 1-3 , the embodiments provided by the present utility model:

[0027] A charging pile with a battery connection group detection module, including a charging pile, the charging pile includes a power supply module for charging a lithium battery pack and a battery connection group detection module. The power supply module mainly includes a transformer, a filter rectifier, a controller and a relay. After the mains voltage is stepped down by the transformer, the AC voltage drops to the rated AC voltage for charging the battery pack. After the rated AC voltage is filtered and rectified by the filter rectifier, the output is the rated DC voltage to be able to charge the lithium battery pack. The charging and power-off of the lithium battery pack are controlled by controlling the on-off of the coil of the relay through the controller, so as to provide a charging function for the lithium battery.

[0028] The battery connection group detection module includes a single-chip microcomputer module and a detection unit. The single-chip microcomputer module uses a single-chip microcomputer of the ESP32 model. The first control signal terminal of the single-chip microcomputer module is electrically connected to the signal receiving terminal of the power supply module. The signal receiving terminal of the single-chip microcomputer module is electrically connected to the detection unit. The detection unit includes a current sensor and a voltage sensor. It mainly detects the magnitude of the current and voltage transmitted by the charging line through the current sensor and the voltage sensor, and then feeds back to the single-chip microcomputer to judge whether there is a short circuit or disconnection in the series connection between the lithium battery modules in the lithium battery pack. By comparing the preset normal charging voltage and current magnitude of the lithium battery pack in the single-chip microcomputer with the fed-back voltage and current magnitude, if the total voltage is too low / high compared with the set rated voltage, or the current is too large or too small compared with the rated current, a control electrical signal is sent by the single-chip microcomputer to the controller in the power supply module, and the controller is driven to disconnect the relay to provide protection for the lithium battery and the charging pile;

[0029] The input end of the power supply module is electrically connected to the mains. The output end of the power supply module is connected in series with the current sensor and then supplies power to the battery pack through the charging line and the charging interface. Specifically, the current sensor includes a Hall effect current sensor U1, capacitors C1, C2, a sliding rheostat RV1, an operational amplifier U2, a resistor R1, and a light-emitting diode D1. The IP+ terminal and IP- terminal of the Hall effect current sensor U1 are connected in series on the line from the output end of the power supply module to the charging line. The VCC terminal of the Hall effect current sensor U1 is connected to the +5V power supply and one end of the capacitor C2. The VIOUT terminal of the Hall effect current sensor U1 is connected to the inverting input terminal of the operational amplifier U2. The VIOUT terminal of the Hall effect current sensor U1 is also electrically connected to the signal receiving terminal of the single-chip microcomputer module. The FIL TER terminal of the Hall effect current sensor U1 is connected to one end of the capacitor C1. The other end of the capacitor C1, the other end of the capacitor C2, and the GND of the Hall effect current sensor U1 are all grounded. The two ends of the sliding rheostat RV1 are respectively connected to the +5V power supply and the ground terminal. The adjustment terminal of the sliding rheostat RV1 is connected to the non-inverting input terminal of the operational amplifier U2. The output terminal of the operational amplifier U2 is connected to one end of the resistor R1. The other end of the resistor R1 is connected to one end of the light-emitting diode D1. The other end of the light-emitting diode D1 is grounded.

[0030] Among them, the Hall effect current sensor U1 uses the ACS712 model. The Hall effect current sensor U1 is used to detect the magnitude of the current on the charging cable, convert the current into a voltage signal proportional to the current. After the voltage signal is compared with the rated voltage set inside the single-chip microcomputer, it is used to determine whether the current is too large or too low compared to the rated current. The Hall effect current sensor U1 amplifies the output signal through the operational amplifier U2, enabling the light-emitting diode D1 to emit light to indicate the presence of current. The amplitude of the output signal is set by adjusting the resistance value of the sliding rheostat RV1. The capacitor C1 is used for filtering to remove high-frequency noise and ensure the stability of the signal. The capacitor C2 is used for power supply decoupling to reduce the impact of power supply noise on the circuit.

[0031] The input end of the voltage sensor is electrically connected to the output end of the voltage dividing circuit. The input end of the voltage dividing circuit is connected in parallel to the positive and negative terminal posts of the battery pack through the charging cable. The function of the voltage dividing circuit is to prevent the voltage sensor from being damaged due to overloading caused by excessive voltage. The voltage sensor includes a voltage monitoring IC chip U29. The voltage monitoring IC chip U29 uses the INA226 model. The VIN+ terminal and VIN- terminal of the voltage monitoring IC chip U29 are connected in parallel with the capacitor C101. The VIN+ terminal and VIN- terminal of the voltage monitoring IC chip U29 are electrically connected to the output end of the voltage dividing circuit. The VS of the voltage monitoring IC chip U29 is connected to a 3.3V power supply. The SDA terminal of the voltage monitoring IC chip U29 is connected to one end of the resistor R11. The SCL terminal of the voltage monitoring IC chip U29 is connected to one end of the resistor R10. The SDA terminal and SCL terminal of the voltage monitoring IC chip U29 are respectively electrically connected to the signal receiving end of the single-chip microcomputer module. The other ends of the resistor R10 and resistor R11 are commonly connected to a 3.3V power supply.

[0032] Among them, the voltage monitoring IC chip U29 converts the analog signal into a digital signal through the built-in analog-to-digital converter ADC. The voltage monitoring IC chip U29 measures the voltage magnitude of the lithium battery pack after voltage division through the VIN+ terminal and VIN- terminal. The capacitor C101 is used for filtering and decoupling to ensure power supply stability and reduce the impact of noise on the measurement. The voltage monitoring IC chip U29 provides a digital signal of the voltage magnitude for the single-chip microcomputer module through the SDA terminal and SCL terminal, and the single-chip microcomputer module compares and processes the total voltage magnitude of the lithium battery pack with the preset rated voltage.

[0033] Furthermore, the second control signal terminal of the single-chip microcomputer module is electrically connected to the alarm module. Through the buzzer or light-emitting diode of the alarm module, it can alarm when the single-chip microcomputer module detects that the voltage and current of the lithium battery pack do not meet the preset charging voltage and current, so as to remind users and staff.

[0034] Further, the signal output end of the single-chip microcomputer module is electrically connected to the display module through the digital-to-analog conversion module, and the voltage and current of the lithium battery pack can be intuitively displayed through the display screen of the display module, so as to intuitively judge whether each battery module in the lithium battery pack is in series.

[0035] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging pile with a battery connection group detection module, comprising a charging pile, characterized in that: The charging pile includes a power supply module and a battery connection group detection module for charging a lithium battery pack, the battery connection group detection module includes a single-chip module and a detection unit, the first control signal end of the single-chip module is electrically connected to the signal receiving end of the power supply module, the signal receiving end of the single-chip module is electrically connected to the detection unit, and the detection unit includes a current sensor and a voltage sensor; The input end of the power supply module is electrically connected to the mains power, the output end of the power supply module is connected in series with the current sensor and then supplies power to the battery pack through a charging cable and a charging interface, the input end of the voltage sensor is electrically connected to the output end of the voltage divider circuit, and the input end of the voltage divider circuit is connected in parallel to the positive and negative terminals of the battery pack through the charging cable.

2. A charging pile with a battery connection group detection module according to claim 1, characterized in that: The current sensor comprises a Hall effect current sensor U1, a capacitor C1, a capacitor C2, a sliding rheostat RV1, an operational amplifier U2, a resistor R1 and a light emitting diode D1. The IP+ and IP- terminals of the Hall effect current sensor U1 are connected in series on the line from the output terminal of the power supply module to the charging line. The VCC terminal of the Hall effect current sensor U1 is connected to a +5V power supply and connected to one end of the capacitor C2. The VIOUT terminal of the Hall effect current sensor U1 is connected to the inverting input terminal of the operational amplifier U2. The VIOUT terminal of the Hall effect current sensor U1 is also connected to the signal input terminal of the single chip microcomputer module. The signal receiving end is electrically connected, the FILTER end of the Hall effect current sensor U1 is connected to one end of the capacitor C1, the other end of the capacitor C1, the other end of the capacitor C2, and the GND of the Hall effect current sensor U1 are all grounded, the two ends of the sliding rheostat RV1 are respectively connected to the +5V power supply and the ground end, the adjustment end of the sliding rheostat RV1 is connected to the non-inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the light emitting diode D1, and the other end of the light emitting diode D1 is grounded.

3. A charging pile with a battery connection group detection module according to claim 1, characterized in that: The voltage sensor includes a voltage monitoring IC chip U29, the VIN+ and VIN- ends of the voltage monitoring IC chip U29 are connected in parallel with a capacitor C101, the VIN+ and VIN- ends of the voltage monitoring IC chip U29 are electrically connected to the output end of the voltage divider circuit, the VS of the voltage monitoring IC chip U29 is connected to a 3.3V power supply, the SDA end of the voltage monitoring IC chip U29 is connected to one end of the resistor R11, the SCL end of the voltage monitoring IC chip U29 is connected to one end of the resistor R10, the SDA end and the SCL end of the voltage monitoring IC chip U29 are respectively electrically connected to the signal receiving end of the single-chip microcomputer module, and the other ends of the resistor R10 and the resistor R11 are connected to a 3.3V power supply.

4. A charging pile with a battery connection group detection module according to claim 1, characterized in that: The second control signal terminal of the single chip microcomputer module is electrically connected to the alarm module.

5. A charging pile with a battery connection group detection module according to claim 1, characterized in that: The signal output end of the single chip microcomputer module is electrically connected to the display module through the digital-to-analog conversion module.

6. A charging pile with a battery connection group detection module according to any one of claims 1 to 5, characterized in that: The single-chip microcomputer module adopts a single-chip microcomputer of the ESP32 model.

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