Intelligent electric quantity display instrument of lithium battery pack

Abstract

The utility model discloses an intelligent electric quantity display instrument of a lithium battery pack. The intelligent electric quantity display instrument comprises an MCU chip U1, a touch key module, a communication module, a wireless Bluetooth module and a flicker indicating lamp module, the touch key module is connected with the MCU chip U1, the key module is responsible for receiving a touch signal and carrying out filtering and jitter elimination processing on the touch signal, the flicker indicator light module is connected with the MCU chip U1, the flicker indicator light module is used for carrying out targeted output on different data, the wireless Bluetooth module is connected with the MCU chip U1, and the wireless Bluetooth module is connected with the MCU chip U1. The wireless Bluetooth module is connected with the BMS and obtains BMS data, and the communication module is connected with the MCU chip U1. According to the utility model, different SOC values can be displayed according to different flicker indicating lamp modules, fault code display can be realized, a default OCV table can be inquired according to voltage to display the corresponding SOC value when no communication exists, and the SOC value can be displayed according to uploaded SOC data when communication exists.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an intelligent power display instrument for a lithium battery pack. Background Art

[0002] The development of new energy has driven the development of the automotive industry. With the popularization of electric vehicles, people's requirements for electric vehicle power display instruments have also increased. There are many communication methods for instruments. At present, the communication methods of traditional back-end modified instruments mainly use RS485, CAN and UART. Under this communication method, a special communication line needs to be connected to the outside, and the communication line needs to be connected separately at the battery pack end, which greatly affects production efficiency. After this communication line is connected, the electromagnetic characteristics of the entire battery pack will be changed, affecting the stability of the entire battery pack.

[0003] Traditional instruments obtain the corresponding SOC value by looking up the table based on the collected total pressure. Since different batteries will produce different battery curves, the SOC display will have a large deviation from the actual value under different batteries. Traditional instruments cannot display the specific alarm status of the battery pack because they cannot communicate with the BMS. Traditional instruments only detect the total pressure but not the current. They cannot know the current charge and discharge status and cannot provide status indication during charging. Traditional instruments cannot identify fast charging and slow charging, and the display is not intuitive enough and the display diversity is not enough. For this reason, we propose an intelligent power display instrument for lithium battery packs. Utility Model Content

[0004] The purpose of the utility model is to provide an intelligent power display instrument for a lithium battery pack to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an intelligent power display meter for a lithium battery pack, comprising an MCU chip U1, a touch button module, a communication module, a wireless Bluetooth module and a flashing indicator light module;

[0006] The touch button module is connected to the MCU chip U1, and the button module is responsible for receiving the touch signal and filtering and de-bouncing the touch signal. The flashing indicator light module is connected to the MCU chip U1, and the flashing indicator light module is used to output different data in a targeted manner. The wireless Bluetooth module is connected to the MCU chip U1, and the wireless Bluetooth module is connected to the BMS and obtains BMS data. The communication module is connected to the MCU chip U1.

[0007] Furthermore, the touch key module includes a chip U2, a KEY pin of the chip U2 is connected to the touch key K1 through a resistor R6, an OUT pin of the chip U2 is connected to the PA15 pin of the MCU chip U1, an MD pin of the chip U2 is connected to a current-limiting resistor R7, a VDD pin and a C1 pin of the chip U2 are respectively connected to capacitors C3 and C4, and a VDD pin of the chip U2 is connected to a resistor R8.

[0008] Furthermore, the communication module includes a transient suppression diode D1, a transient suppression diode D2, a transient suppression diode D3, a resistor R32, a resistor R33, a resettable fuse F1 and a resettable fuse F2, the resistor R32 is connected to the resettable fuse F1, the resistor R33 is connected to the resettable fuse F2, a transient suppression diode D3 is connected between the resistor R32 and the resistor R33, the resistor R33 is connected to the transient suppression diode D2 and then grounded, the resistor R32 is connected to the transient suppression diode D3 and then grounded, the resistor R32 is connected to the PA3 pin of the MCU chip U1, and the resistor R33 is connected to the PA2 pin of the MCU chip U1.

[0009] Furthermore, the wireless Bluetooth module includes a chip B1 and an antenna CON2, the VBAT pin of the chip B1 is connected to a resistor R3, a capacitor C1 and a capacitor C2, the VBAT pin of the chip B1 is connected to a transistor Q1, the BLEPWR_ON pin of the MCU chip U1 is connected to the transistor Q1, the RESET pin of the chip B1 is connected to a resistor R2, the PC5 pin of the chip B1 is connected to the PC2 pin of the MCU chip U1, the PA6 pin and the PA7 pin of the chip B1 are respectively connected to the resistor R4 and the resistor R5 and are connected through the PC4 pin and the PC5 pin of the MCU chip U1, and communicate with the MCU.

[0010] Furthermore, it also includes twelve groups of flashing light indication modules, which include light-emitting diodes and resistors connected to each other, and the twelve groups of flashing light indication modules are respectively connected to the PA12 pin, PB2 pin, PB3 pin, PB4 pin, PB5 pin, PB6 pin, PB7 pin, PB8 pin, PB9 pin, PB10 pin, PB11 pin and PB12 pin of the MCU chip U1.

[0011] Furthermore, the light emitting diode is connected to a 3.3V power supply.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the touch button module of the utility model is responsible for receiving touch signals, and filtering and de-jittering the touch signals so that the touch signals can be output smoothly, while the flashing indicator light module outputs different data in a targeted manner. When used as an SOC display, the number of indicator lights corresponds to different SOCs. When charging, the current SOC highest node flashes to indicate the charging status. When a fault occurs, the current fault status is indicated by flashing and being always on. The wireless Bluetooth module is responsible for connecting to the BMS and obtaining detailed BMS data. The communication module is connected to the PC host computer. During the debugging stage, the real-time data of the intelligent power display instrument of the lithium battery pack can be obtained through the communication module. When the intelligent power display instrument of the lithium battery pack is connected to the BMS, the communication module can transmit the real-time BMS data to the PC host computer so that the equipment maintenance personnel can quickly locate the specific problem.

[0013] This setting can display different SOC values ​​according to different flashing indicator light modules, and can also realize fault code display. In addition, it can display the corresponding SOC value according to the default OCV table based on the voltage query when there is no communication, and display it according to the uploaded SOC data when there is communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the system principle of the utility model;

[0015] Figure 2 This is a schematic diagram of the circuit structure of the communication module of the utility model;

[0016] Figure 3 This is a schematic diagram of the circuit structure of the MCU chip U1 of the utility model;

[0017] Figure 4 This is a schematic diagram of the circuit structure of the wireless Bluetooth module of the utility model;

[0018] Figure 5 This is a schematic diagram of the circuit structure of the flashing indicator light module of the utility model;

[0019] Figure 6 This is a schematic diagram of the circuit structure of the touch key module of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1, the utility model provides a technical solution: an intelligent power display instrument for a lithium battery pack, including an MCU chip U1, a touch button module, a communication module, a wireless Bluetooth module and a flashing indicator light module;

[0022] The touch button module is connected to the MCU chip U1, and the button module is responsible for receiving the touch signal and filtering and de-bouncing the touch signal. The flashing indicator light module is connected to the MCU chip U1, and the flashing indicator light module is used to output different data in a targeted manner. The wireless Bluetooth module is connected to the MCU chip U1, and the wireless Bluetooth module is connected to the BMS and obtains BMS data. The communication module is connected to the MCU chip U1.

[0023] See also Figure 1 , Figure 3 and Figure 6 The touch key module includes a chip U2, a KEY pin of the chip U2 is connected to the touch key K1 through a resistor R6, an OUT pin of the chip U2 is connected to the PA15 pin of the MCU chip U1, an MD pin of the chip U2 is connected to a current-limiting resistor R7, a VDD pin and a C1 pin of the chip U2 are respectively connected to capacitors C3 and C4, and a VDD pin of the chip U2 is connected to a resistor R8.

[0024] Among them, when the touch button K1 is pressed, the chip U2 receives a signal, and the pin of the chip U2 generates a high level. After the MCU chip U1 recognizes this high level, the flashing light indication module selectively displays the charging status or SOC according to the current state; the VDD pin of the chip U2 plays a filtering role through the combination of capacitors and resistors, which can make the power supply more stable, and the MD pin of the chip U2 plays a current limiting role through the resistor R7 to ensure that the input current does not exceed the set current value, and the C1 pin of the chip U2 is at a low level at the moment of power-on through the capacitor C4, and becomes a high level after power-on to play a power-on reset role.

[0025] See also Figure 1 , Figure 2 and Figure 3 The communication module includes a transient suppression diode D1, a transient suppression diode D2, a transient suppression diode D3, a resistor R32, a resistor R33, a resettable fuse F1 and a resettable fuse F2, the resistor R32 is connected to the resettable fuse F1, the resistor R33 is connected to the resettable fuse F2, a transient suppression diode D3 is connected between the resistor R32 and the resistor R33, the resistor R33 is connected to the transient suppression diode D2 and then grounded, the resistor R32 is connected to the transient suppression diode D3 and then grounded, the resistor R32 is connected to the PA3 pin of the MCU chip U1, and the resistor R33 is connected to the PA2 pin of the MCU chip U1.

[0026] See also Figure 1 , Figure 3 and Figure 4 The wireless Bluetooth module includes a chip B1 and an antenna CON2. The GND pin of the chip B1 is connected to the GND of the entire system. The VBAT pin of the chip B1 is connected to a resistor R3, a capacitor C1 and a capacitor C2. The VBAT pin of the chip B1 is connected to a transistor Q1. The capacitance values ​​of the capacitors C1 and C2 are different. The different capacitance values ​​of the capacitors C1 and C2 are used to filter out clutter at different frequencies. The BLEPWR_ON pin of the MCU chip U1 is connected to the transistor Q1. The MCU chip U1 controls the conduction state of the transistor Q1 to control whether the wireless Bluetooth module is powered on. If the wireless Bluetooth module is in a serious alarm state, the MCU chip U1 can control the BLEPWR_ON pin to force the wireless Bluetooth module to be powered off and powered on again to make the wireless Bluetooth module run again to improve the stability of the entire system. The RESET pin of chip B1 is connected to resistor R2. The RESET pin of chip B1 is a reset pin. The RESET pin of chip B1 is connected to GND through resistor R2, and this reset pin is connected to MCU through RSTP pin. The PC5 pin of chip B1 is connected to PC2 pin of MCU chip U1. MCU chip U1 controls PC5 pin through PC2 pin, so that the wireless Bluetooth module is in initialization mode. MCU chip U1 can initialize the Bluetooth wireless module. The PA6 pin and PA7 pin of chip B1 are respectively connected to resistor R4 and resistor R5 and are connected to PC4 pin and PC5 pin of MCU chip U1 through PC4 pin and PC5 pin, and communicate with MCU. The ANT pin of chip B1 is connected to the CONT pin of antenna CON2 so that the entire system can receive and send signals.

[0027] See also Figure 1 , Figure 3 and Figure 5 , and also includes twelve groups of flashing light indication modules, the flashing light indication modules include light-emitting diodes and resistors connected to each other, the twelve groups of flashing light indication modules are respectively connected to the PA12 pin, PB2 pin, PB3 pin, PB4 pin, PB5 pin, PB6 pin, PB7 pin, PB8 pin, PB9 pin, PB10 pin, PB11 pin and PB12 pin of the MCU chip U1, and the various pins of the MCU chip U1 are used to control the on and off of the light-emitting diodes, thereby realizing the display of the SOC. When an alarm is given, different alarms will be displayed in a flashing manner, and the light-emitting diodes are connected to a 3.3V power supply.

[0028] When in use, first, the touch button module is responsible for receiving the touch signal, and filtering and de-bouncing the touch signal to make the touch signal output smoothly, while the flashing indicator light module outputs different data in a targeted manner. When used as an SOC display, the number of indicator lights corresponds to different SOCs. When charging, the current SOC highest node flashes to indicate the charging status. In case of a fault, the current fault status is indicated by flashing and always on. The wireless Bluetooth module is responsible for connecting to the BMS and obtaining detailed BMS data. The communication module is connected to the PC host computer. During the debugging stage, the real-time data of the intelligent power display instrument of the lithium battery pack can be obtained through the communication module. When the intelligent power display instrument of the lithium battery pack is connected to the BMS, the communication module can transmit the BMS real-time data to the PC host computer so that equipment maintenance personnel can quickly locate specific problems.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent power display instrument for a lithium battery pack, characterized in that: It includes MCU chip U1, touch button module, communication module, wireless Bluetooth module and flashing indicator light module; The touch button module is connected to the MCU chip U1, and the button module is responsible for receiving the touch signal and filtering and de-bouncing the touch signal. The flashing indicator light module is connected to the MCU chip U1, and the flashing indicator light module is used to output different data in a targeted manner. The wireless Bluetooth module is connected to the MCU chip U1, and the wireless Bluetooth module is connected to the BMS and obtains BMS data. The communication module is connected to the MCU chip U1.

2. The intelligent power display meter for a lithium battery pack according to claim 1, characterized in that: The touch key module includes a chip U2, a KEY pin of the chip U2 is connected to a touch key K1 through a resistor R6, an OUT pin of the chip U2 is connected to a PA15 pin of the MCU chip U1, an MD pin of the chip U2 is connected to a current-limiting resistor R7, a VDD pin and a C1 pin of the chip U2 are respectively connected to capacitors C3 and C4, and a VDD pin of the chip U2 is connected to a resistor R8.

3. The intelligent power display instrument of a lithium battery pack according to claim 2, characterized in that: The communication module includes a transient suppression diode D1, a transient suppression diode D2, a transient suppression diode D3, a resistor R32, a resistor R33, a resettable fuse F1 and a resettable fuse F2, the resistor R32 is connected to the resettable fuse F1, the resistor R33 is connected to the resettable fuse F2, a transient suppression diode D3 is connected between the resistor R32 and the resistor R33, the resistor R33 is connected to the transient suppression diode D2 and then grounded, the resistor R32 is connected to the transient suppression diode D3 and then grounded, the resistor R32 is connected to the PA3 pin of the MCU chip U1, and the resistor R33 is connected to the PA2 pin of the MCU chip U1.

4. The intelligent power display meter for a lithium battery pack according to claim 3, characterized in that: The wireless Bluetooth module includes a chip B1 and an antenna CON2, the VBAT pin of the chip B1 is connected to a resistor R3, a capacitor C1 and a capacitor C2, the VBAT pin of the chip B1 is connected to a transistor Q1, the BLEPWR_ON pin of the MCU chip U1 is connected to the transistor Q1, the RESET pin of the chip B1 is connected to a resistor R2, the PC5 pin of the chip B1 is connected to the PC2 pin of the MCU chip U1, the PA6 pin and the PA7 pin of the chip B1 are respectively connected to the resistor R4 and the resistor R5 and are connected through the PC4 pin and the PC5 pin of the MCU chip U1, and communicate with the MCU.

5. The intelligent power display meter for a lithium battery pack according to claim 4, characterized in that: It also includes twelve groups of flashing light indication modules, which include light-emitting diodes and resistors connected to each other. The twelve groups of flashing light indication modules are respectively connected to the PA12 pin, PB2 pin, PB3 pin, PB4 pin, PB5 pin, PB6 pin, PB7 pin, PB8 pin, PB9 pin, PB10 pin, PB11 pin and PB12 pin of the MCU chip U1.

6. The intelligent power display meter for a lithium battery pack according to claim 5, characterized in that: The light emitting diode is connected to a 3.3V power supply.

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