Battery pack monomer voltage measuring instrument

Abstract

The utility model provides a battery pack monomer voltage measuring instrument, which comprises an extension socket connector, a first isolation power supply, a second isolation power supply, a photoelectric relay and a digital voltmeter, and is characterized in that the extension socket connector is connected with a battery pack, the extension socket connector is also connected with the first isolation power supply, and the first isolation power supply is used for converting 24V DC voltage into 5V DC voltage; the first isolation power supply is connected with the second isolation power supply, the second isolation power supply is used for generating 5V isolation voltage, and the second isolation power supply is connected with the photoelectric relay and the digital voltmeter and supplies power to the photoelectric relay and the digital voltmeter; and the photoelectric relay is also connected with the extension socket connector and the digital voltmeter, and the voltage of each single battery in the battery pack is transmitted to the digital voltmeter for display through the photoelectric relay. The device is simple in circuit design, does not need an external power supply for power supply, is accurate in measurement, is convenient and rapid to use, and can more intuitively compare the voltage of each single battery of the battery pack, thereby judging whether each single battery needs to be replaced or not.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery management, and in particular relates to a battery pack single cell voltage measuring instrument. Background Art

[0002] When performing maintenance and inspection on electric vehicle lithium batteries, the existing technologies and equipment for measuring the voltage of each cell in the battery pack include: reading the vehicle's own battery voltage CAN message; lithium battery equalization maintenance tester, multimeter, etc. The main defects or problems of these devices in reading the voltage of each cell in the battery pack are: (1) Using the vehicle voltage CAN message to read, the connection time is long through the mobile phone, the display is not direct, and the font is small; (2) Using the lithium battery equalization maintenance tester has defects such as small display panel and digits, long time, and the need for external mains power; (3) Although the voltage display is direct and fast when measuring with a multimeter, dozens of cells in the battery pack need to be measured and recorded one by one, which is time-consuming. Utility Model Content

[0003] An embodiment of the present application provides a battery pack cell voltage measuring instrument. The measuring instrument has a simple circuit design, does not require an external power supply, has accurate measurement, is easy and fast to use, and can more intuitively compare the voltages of each cell in the battery pack, thereby determining whether each cell needs to be replaced.

[0004] An embodiment of the present application provides a battery pack single cell voltage measuring instrument, including: a power strip connector, a first isolated power supply, a second isolated power supply, a photoelectric relay, and a digital voltmeter. The power strip connector is connected to the battery pack, and the power strip connector is also connected to the first isolated power supply. The first isolated power supply is used to convert 24V DC voltage to 5V DC voltage; the first isolated power supply is connected to the second isolated power supply, and the second isolated power supply is used to generate a 5V isolated voltage. The second isolated power supply is connected to the photoelectric relay and the digital voltmeter to power the photoelectric relay and the digital voltmeter; the photoelectric relay is also connected to the power strip connector and the digital voltmeter, and the voltage of each single cell in the battery pack is transmitted to the digital voltmeter for display through the photoelectric relay.

[0005] Wherein, the strip connector includes a pin header and a strip socket, pin 1 of the pin header is connected to the negative pole of the first battery of the battery pack, the negative pole of the first battery is grounded, pins 2 and 3 of the pin header are connected to the positive pole of the first battery, pins 5 and 6 of the pin header are connected to the positive pole of the second battery, and the negative pole of the second battery is connected to the positive pole of the first battery; pin 1 of the strip socket is connected to the negative input port of the first isolated power supply, pin 10 of the strip socket is connected to the positive input port of the first isolated power supply, the positive output port of the first isolated power supply is connected to the ground port of the second isolated power supply, the negative output port of the first isolated power supply is connected to the input port Vin of the second isolated power supply, the voltage output port of the second isolated power supply is connected to pin 1 and pin 3 of the first photoelectric relay, and pin 1 of the strip socket, pins 2 and 4 of the first photoelectric relay are both connected to port 3 of the second isolated power supply; pins 2 and 3 of the strip socket are connected to the negative input port of the first photoelectric relay The positive output port of the first isolated power supply is connected to the ground port of the third isolated power supply, the negative output port of the first isolated power supply is connected to the input port Vin of the third isolated power supply, pins 2 and 4 of the second photoelectric relay are connected to the third isolated power supply port 3, the third isolated power supply output voltage port is connected to pins 1 and 3 of the second photoelectric relay, and are also connected to pins 4, 5, 6 of the second digital voltmeter, and are also connected to pins 2 and 3 of the socket strip, pins 5 and 6 of the socket strip are connected to pins 6 and 8 of the second photoelectric relay, and pins 5 and 7 of the second photoelectric relay are connected to pins 1, 2, 3, 10, 11, 12 of the second digital voltmeter.

[0006] The digital voltmeter is a 4-digit digital voltmeter, and there are multiple digital voltmeters.

[0007] Wherein, there are multiple photoelectric relays.

[0008] The battery pack single cell voltage measuring instrument of the present application embodiment has the following beneficial effects:

[0009] The measuring instrument of this application has a simple circuit design, does not require an external power supply, has accurate measurement, is easy and fast to use, and can more intuitively compare the voltages of each single cell in the battery pack, thereby determining whether each single cell needs to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of a battery pack single cell voltage measuring instrument according to an embodiment of the present application;

[0011] Figure 2 This is a circuit schematic diagram of a battery pack cell voltage measuring instrument according to an embodiment of the present application. DETAILED DESCRIPTION

[0012] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0013] In the following introduction, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The following introduction provides multiple embodiments of the present invention, and different embodiments can be replaced or combined, so this application can also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more of all other possible combinations of features A, B, C, and D, even though such embodiments may not be explicitly described in the following text.

[0014] like Figure 1 As shown, the battery pack single cell voltage measuring instrument of the present application includes: a power strip connector 21, a first isolated power supply 25, a second isolated power supply 24, a photoelectric relay 22, and a digital voltmeter 23. The power strip connector 21 is connected to the battery pack 20, which can be, for example, the battery pack of an electric vehicle. The power strip connector 21 is also connected to the first isolated power supply 25, which is used to convert a 24V DC voltage to a 5V DC voltage; the first isolated power supply 25 is connected to the second isolated power supply 24, which is used to generate a 5V isolated voltage. The second isolated power supply 24 is connected to the photoelectric relay 22 and the digital voltmeter 23 to supply power to the photoelectric relay 22 and the digital voltmeter 23. The photoelectric relay 22 is also connected to the power strip connector 21 and the digital voltmeter 23. The voltage of each single cell in the battery pack is transmitted to the digital voltmeter 23 for display via the photoelectric relay 22.

[0015] When in use, the plug connector 21 of the measuring instrument of this application is connected to the battery pack. The voltage of the four batteries in the battery pack generates a 5V voltage through the first isolated power supply (24VDC to 5VDC isolated power supply), and is connected to the second isolated power supply (5VDC to DC isolated power supply) to generate a 5V isolated voltage to power the photoelectric relay and the digital voltmeter. The voltage of each single battery is transmitted to the digital voltmeter through the photoelectric relay for direct display.

[0016] like Figure 1-2As shown, the plug connector includes a pin header 30 and a plug 31. Pin 1 of the pin header 30 is connected to the negative electrode of the first battery 32 of the battery pack, and the negative electrode of the first battery 32 is grounded. Pins 2 and 3 of the pin header 30 are connected to the positive electrode of the first battery 32. Pins 5 and 6 of the pin header 30 are connected to the positive electrode of the second battery 33, and the negative electrode of the second battery 33 is connected to the positive electrode of the first battery 32. Pin 1 of the socket strip 31 is connected to the negative input port of the first isolated power supply 25, pin 10 of the socket strip 31 is connected to the positive input port of the first isolated power supply 25, the positive output port of the first isolated power supply 25 is connected to the ground port of the second isolated power supply 24, the negative output port of the first isolated power supply 25 is connected to the input port Vin of the second isolated power supply 24, the voltage output port of the second isolated power supply 24 is connected to pin 1 and pin 3 of the first photoelectric relay 34, and pin 1 of the socket strip, and pins 2 and 4 of the first photoelectric relay 34 are both connected to port 3 of the second isolated power supply 24; pins 2 and 3 of the socket strip 31 are connected to pins 6 and 8 of the first photoelectric relay 34, pins 5 and 7 of the first photoelectric relay 34 are both connected to pins 1, 2, 3, 10, 11, and 12 of the first digital voltmeter 35, and pins 4, 5, and 6 of the first digital voltmeter 35 are all connected to pin 1 of the socket strip.

[0017] The positive output port of the first isolated power supply 25 is connected to the ground port of the third isolated power supply 36, the negative output port of the first isolated power supply 25 is connected to the input port Vin of the third isolated power supply 36, pins 2 and 4 of the second photoelectric relay 37 are both connected to port 3 of the third isolated power supply 36, the output voltage port of the third isolated power supply 36 is connected to pins 1 and 3 of the second photoelectric relay 37, and is also connected to pins 4, 5, and 6 of the second digital voltmeter 38, and is also connected to pins 2 and 3 of the socket strip 31, pins 5 and 6 of the socket strip 31 are both connected to pins 6 and 8 of the second photoelectric relay 37, and pins 5 and 7 of the second photoelectric relay 37 are both connected to pins 1, 2, 3, 10, 11, and 12 of the second digital voltmeter 38.

[0018] In this application, the digital voltmeter is a 4-digit high-precision digital voltmeter, and the photoelectric relay is an AQW photoelectric relay. According to the above principle, the number of digital voltmeters, photoelectric relays, and isolated power supplies is multiple, so as to achieve the measurement of multiple single cells at a time. For example, the measuring instrument of this application is designed to measure 47-channel serial single cell voltages, using an isolated power supply and parallel measurement method. The voltages of each single cell do not affect each other during measurement, which is equivalent to connecting 47 voltmeters at a time to display simultaneously. The measuring instrument has a simple circuit design, does not require an external power supply, measures accurately, is easy and fast to use, and can more intuitively compare the voltages of each single cell in the battery pack, thereby determining whether each single cell needs to be replaced.

[0019] The advantages of the battery pack cell voltage measuring instrument of the embodiment of the present application include: (1) When testing the cell voltage of a lithium battery pack, the measuring instrument is easy to connect and eliminates the need for 220V AC power supply. (2) The voltage display is direct and fast, and the panel numbers are large enough to quickly determine whether each cell needs to be replaced. (3) The voltage display values ​​of each cell are designed on a single panel, and the digital display is clear at a glance. (4) The measuring instrument is easy to move and carry.

[0020] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A battery pack single cell voltage measuring instrument, characterized in that: include: A power strip connector, a first isolated power supply, a second isolated power supply, a photoelectric relay, and a digital voltmeter. The power strip connector is connected to the battery pack and is also connected to the first isolated power supply. The first isolated power supply is used to convert 24V DC voltage to 5V DC voltage; the first isolated power supply is connected to the second isolated power supply, and the second isolated power supply is used to generate a 5V isolated voltage. The second isolated power supply is connected to the photoelectric relay and the digital voltmeter to power the photoelectric relay and the digital voltmeter; the photoelectric relay is also connected to the power strip connector and the digital voltmeter, and the voltage of each single cell in the battery pack is transmitted to the digital voltmeter for display through the photoelectric relay.

2. The battery pack single cell voltage measuring instrument according to claim 1, characterized in that: The digital voltmeter is a 4-digit digital voltmeter, and the number of the digital voltmeters is multiple.

3. The battery pack single cell voltage measuring instrument according to claim 1 or 2, characterized in that: There are multiple photoelectric relays.

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