Battery charging and discharging monitoring device

Abstract

The utility model relates to a battery charge and discharge monitoring device, which comprises a shell and a BMS circuit board arranged in an inner cavity of the shell, the shell comprises a bottom box and a top cover, the bottom box comprises a bottom box body and a front box cover, the bottom box body comprises a bottom plate, a side plate and a rear end plate, a front baffle is fixedly arranged on the inner side wall of the front box cover, a front positioning groove is formed between the front baffle and the front box cover, and a rear positioning groove is formed between the front baffle and the rear box cover. The top cover comprises a cover plate, connecting plates fixedly connected with the cover plate are arranged on the periphery of the cover plate, the connecting plate on the front side of the cover plate is arranged in the positioning groove, the connecting plate on the rear side of the cover plate is located on the outer side of the rear end plate, and the connecting plates on the left side and the right side of the cover plate make contact with the tops of the side plates. The front box cover, the front baffle and the connecting plate on the front side of the cover plate are fixedly connected through screws. The battery charging and discharging monitoring device is simple in structure, convenient to disassemble and assemble and low in cost.

Description

Technical Field

[0001] The utility model relates to a charge and discharge monitoring device, in particular to a battery charge and discharge monitoring device. Background Art

[0002] With the widespread application of batteries in various fields, it is particularly important to monitor battery charging. Existing battery monitoring devices integrated into charging devices generally include a shell, in which a circuit control board is arranged. The circuit control board effectively monitors the battery charging process by collecting the voltage and current during battery charging. Existing battery charging devices mainly have the following problems. Specifically, their overall structure is relatively complex, and the shell is difficult to disassemble and assemble, which makes their overall preparation cost high and their subsequent maintenance is also relatively inconvenient. For this reason, it is necessary to design a new battery charge and discharge monitoring device to reduce its overall cost, facilitate subsequent maintenance, and at the same time monitor the battery charging temperature to prevent fire. Summary of the Invention

[0003] In order to solve the above technical problems, the utility model provides a battery charge and discharge monitoring device with simple structure, easy assembly and disassembly, and low cost.

[0004] The battery charge and discharge monitoring device of the utility model comprises a shell and a BMS circuit board arranged in the inner cavity of the shell. The shell comprises a bottom box with an opening at the top and a top cover above the bottom box. The bottom box comprises a bottom box body and a front box cover detachably connected to the bottom box body. The bottom box body comprises a bottom plate, side plates on the left and right sides of the bottom plate and a rear end plate on the rear side of the bottom plate. The side plates and the rear end plate are fixedly connected to the bottom plate. A front baffle is fixedly arranged on the inner side wall of the front box cover. The bottom end of the front baffle is fixedly arranged on the front box On the inner wall of the cover, there is a front positioning groove between the front baffle and the front box cover, and a rear baffle is provided on the rear end plate, and the bottom end of the rear baffle is fixedly set on the top end of the rear end plate. The top cover includes a cover plate, and a connecting plate fixedly connected to the cover plate is provided on the periphery of the cover plate. The connecting plate on the front side of the cover plate is set in the positioning groove, and the connecting plate on the rear side of the cover plate is located on the outside of the rear end plate. The connecting plates on the left and right sides of the cover plate are in contact with the top of the side plate, and the front box cover, the front baffle and the connecting plate on the front side of the cover plate are fixedly connected by screws.

[0005] The advantage of the battery charge and discharge monitoring device is that its shell includes a bottom box and a top cover, the bottom box includes a bottom box body and a front box cover, a front baffle is provided on the inside of the front box cover, the space between the front baffle and the front box cover is a positioning groove corresponding to the front connecting plate of the top cover, and a rear baffle for positioning the top cover is provided on the rear end plate behind the bottom plate.

[0006] This battery charge and discharge monitoring device features a positioning slot on the front cover and a rear baffle on the rear end panel to position the top cover. Operators can securely connect the front cover, front baffle, and front connecting plate of the top cover with screws, thereby assembling and securing the entire housing. Compared to existing battery charge and discharge monitoring devices, the overall housing structure is simpler and easier to assemble, thus reducing the overall cost of the device. Operators only need a single screw to assemble the housing, making the operation extremely convenient and facilitating assembly and subsequent maintenance of the device.

[0007] Furthermore, in the battery charge and discharge monitoring device of the present invention, a display screen is provided on the top cover.

[0008] The display screen setting allows the operator to view the battery voltage, current, temperature and other data in real time through the display screen.

[0009] Furthermore, in the battery charge and discharge monitoring device of the present invention, a plurality of interfaces are provided on the side walls of the bottom box body.

[0010] Several interfaces on the side wall of the bottom box body facilitate the connection between the BMS circuit board and external devices.

[0011] Furthermore, in the battery charge and discharge monitoring device of the present invention, the shell is made of aluminum alloy.

[0012] The housing made of aluminum alloy improves the overall safety of the device.

[0013] Furthermore, in the battery charge and discharge monitoring device of the present invention, a slide groove is provided on the inner wall of the base box, and the edge of the BMS circuit board is arranged in the slide groove.

[0014] The setting of the slide groove allows the operator to slide the edge of the BMS circuit board into the bottom box through the slide groove, thereby achieving the positioning and installation of the BMS circuit board.

[0015] Furthermore, in the battery charge and discharge monitoring device of the present invention, a plurality of support members are provided on the bottom surface of the BMS circuit board, and two ends of the support members are in contact with the BMS circuit board and the bottom plate respectively.

[0016] The provision of several support members not only supports the BMS circuit board, but also presses the BMS circuit board tightly into the slide groove, thereby improving the tightness between the BMS circuit board and the bottom box, and preventing the device from being damaged by external vibration.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it in accordance with the contents of the specification, the following embodiments of the present invention are described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a disassembled diagram of the battery charge and discharge monitoring device.

[0019] Figure 2 1 is a circuit schematic diagram of the first step-down circuit.

[0020] Figure 3 This is the circuit schematic diagram of the second step-down circuit.

[0021] Figure 4 This is the circuit schematic diagram of the third step-down circuit.

[0022] Figure 5 This is the circuit schematic diagram of the battery monitoring module.

[0023] Figure 6 It is the circuit schematic diagram of the microprocessor module.

[0024] Figure 7 This is the circuit schematic diagram of the alarm module.

[0025] Figure 8 This is the circuit schematic diagram of the charge and discharge management module.

[0026] Figure 9 This is the structural block diagram of the BMS circuit board.

[0027] In the figure, BMS circuit board 1, bottom box body 2, front box cover 3, bottom plate 4, side plate 5, rear end plate 6, front baffle 7, positioning groove 8, rear baffle 9, cover plate 10, connecting plate 11, screw 12, threaded hole 13, first interface 14, second interface 15, third interface 16, fourth interface 17. DETAILED DESCRIPTION

[0028] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] Example 1: See Figures 1 to 9The battery charge and discharge monitoring device of this embodiment includes a shell and a BMS circuit board 1 arranged in the inner cavity of the shell. The shell includes a bottom box with an opening at the top and a top cover above the bottom box. The bottom box includes a bottom box body 2 and a front box cover 3 detachably connected to the bottom box body. The bottom box body includes a bottom plate 4, side plates 5 on the left and right sides of the bottom plate, and a rear end plate 6 on the rear side of the bottom plate. The side plates and the rear end plate are fixedly connected to the bottom plate. A front baffle 7 is fixedly provided on the inner side wall of the front box cover. The bottom end of the front baffle is fixedly provided on the front box On the inner wall of the cover, there is a front positioning groove 8 between the front baffle and the front box cover, and a rear baffle 9 is provided on the rear end plate. The bottom end of the rear baffle is fixedly set on the top end of the rear end plate. The top cover includes a cover plate 10, and the periphery of the cover plate is provided with a connecting plate 11 fixedly connected to the cover plate. The connecting plate on the front side of the cover plate is set in the positioning groove, and the connecting plate on the rear side of the cover plate is located on the outside of the rear end plate. The connecting plates on the left and right sides of the cover plate are in contact with the top of the side plate. The front box cover, the front baffle and the connecting plate on the front side of the cover plate are fixedly connected by screws 12.

[0030] The battery charge and discharge monitoring device has a shell including a bottom box and a top cover. The bottom box includes a bottom box body and a front box cover. A front baffle is provided on the inner side of the front box cover. The space between the front baffle and the front box cover is a positioning groove corresponding to the front connecting plate of the top cover. A rear baffle is provided on the rear end plate behind the bottom plate for positioning the top cover.

[0031] This battery charge and discharge monitoring device features a positioning slot on the front cover and a rear baffle on the rear end panel to position the top cover. Operators can securely connect the front cover, front baffle, and front connecting plate of the top cover with screws, thereby assembling and securing the entire housing. Compared to existing battery charge and discharge monitoring devices, the overall housing structure is simpler and easier to assemble, thus reducing the overall cost of the device. Operators only need a single screw to assemble the housing, making the operation extremely convenient and facilitating assembly and subsequent maintenance of the device.

[0032] Among them, the bottom box is used to install the BMS circuit board, set the connection interface, etc., which includes the bottom box body, the bottom box body includes the bottom plate, side panels on both sides of the bottom plate, and the rear end panel on the rear side of the bottom plate. Preferably, the bottom plate, side panels and rear end panel can be formed in one piece to facilitate assembly by operators and ensure the overall strength of the shell.

[0033] The BMS circuit board is arranged in the inner cavity of the bottom box and fixed by screws.

[0034] The front box cover is a flat structure, and its height is slightly higher than the height of the side panels and rear end panel of the bottom box. A front baffle is connected to its inner side. The front baffle can be an L-shaped baffle, and its bottom end is fixedly connected to the inner side surface of the front box cover. It can be integrally formed with the front box cover, or fixed by screws.

[0035] There is a certain distance between the front baffle and the front cover to form the above-mentioned positioning groove. The width of the positioning groove is substantially the same as the width of the front connecting plate of the top cover to ensure a tight connection between the top cover and the front cover. Corresponding threaded holes 13 are opened on the front cover, the front baffle and the front connecting plate of the top cover to facilitate screw connection.

[0036] The rear end panel of the bottom box is equipped with a rear baffle to limit the position of the rear connecting plate of the top cover. This is preferably an L-shaped baffle, with its bottom end fixed to the top of the rear end panel and its top end substantially flush with the front baffle and the top of the front box cover. Both the front and rear baffles are slightly shorter than the front box cover or rear end panel to facilitate the connection between the top cover and the bottom box. During connection, the connecting plate on the rear side of the top cover snaps onto the outside of the rear baffle, while the connecting plate on the front side of the top cover is set into the positioning groove. The bottom end of the front box cover can be set into the groove of the bottom plate. The operator then screws through the front box cover and the front baffle in sequence to connect them to the front connecting plate of the top cover. At this point, the bottom surfaces of the connecting plates on both sides of the top cover contact the side panels on both sides of the bottom box to achieve a seal.

[0037] The BMS circuit board (battery management system circuit board) is used to monitor battery charging, which includes a power module, a microprocessor module, a battery monitoring module, a charge and discharge management module, a communication module and an alarm module.

[0038] The power module includes a first step-down circuit, a second step-down circuit, and a third step-down circuit. The power module connects the battery voltage to the first step-down circuit through the first interface 14. The output end of the first step-down circuit is connected to the input end of the second step-down circuit through a wire. The output end of the second step-down circuit is connected to the input end of the third step-down circuit through a wire. The third step-down circuit outputs a 3.3V voltage and is connected to the power pin of the microprocessor module through a wire.

[0039] The IIC communication pin of the microprocessor module is connected to the IIC communication interface of the battery monitoring module through a wire.

[0040] Among them, the battery monitoring module adopts the BQ76930 chip, and the positive and negative poles of each single battery of the series battery pack to be tested are connected to the first interface on the bottom box through a wiring harness, and are connected to the voltage collection pin of the BQ76930 chip through a wiring harness inside the shell; the NTC thermistor is placed at the battery to be tested to collect battery temperature information, connected to the second interface 15 on the bottom box, connected to the connector of the BMS circuit board through a wiring harness inside the shell, and then connected to the temperature collection pin of the BQ76930 chip through a wire; the battery charging interface is the third interface 16 on the bottom box; the charge and discharge control pin of the battery monitoring module is connected to the MOSFET of the charge and discharge management module through a wire. Specifically, the discharge pin of the BQ76930 chip is connected to the device Q3, that is, the source of the P-channel FET, through a wire to prevent the discharge pin voltage of the BQ76930 chip from being lower than VSS; the drain of Q3 is connected to the positive electrode of the diode and the 1M ohm resistor, which plays the role of voltage reduction and current limiting when PACK- is pulled high; the negative electrode of the diode and the other end of the 1M ohm resistor are connected to the gate of the MOSFET Q2 to control the MOSFET Q1 is turned on and off, the source of Q2 is connected to PACK- of interface 3 through a wire, and the drain is connected to the drain of MOSFET Q1 through a wire; Q1, Q2, and Q3 are all field effect transistors.

[0041] The charging pin of the BQ76930 chip is connected to the gate of MOSFET Q1 through a wire to control the on and off of MOSFET Q1. The source of MOSFET Q1 is grounded through a resistor.

[0042] The communication module adopts a serial communication protocol and is brought out through the fourth interface 17. The transmitting and receiving ends of the fourth interface are connected to pins 30 and 31 of the microprocessor chip STM32F103C8T6 through wires. The communication module supports Bluetooth or wiring harness communication, which facilitates data transmission in different scenarios, such as local monitoring, remote monitoring, and large-scale battery cluster monitoring.

[0043] The pins of the alarm module and the microprocessor module are connected by wires, and the buzzer is driven to alarm when the battery temperature is too high or the voltage is too low, thereby improving the safety of battery use;

[0044] The BMS circuit board is encapsulated in the shell and adopts a modular design. Each functional module is relatively independent, which facilitates the assembly, maintenance and upgrade of the system. The system has the advantages of small size, rich functions, high integration and strong scalability.

[0045] Preferably, a display screen is provided on the top cover.

[0046] The display screen setting allows the operator to view the battery voltage, current, temperature and other data in real time through the display screen.

[0047] Preferably, a plurality of interfaces are provided on the side walls of the bottom box body.

[0048] Several interfaces on the side wall of the bottom box body facilitate the connection between the BMS circuit board and external devices.

[0049] Preferably, the housing is made of aluminum alloy.

[0050] The housing made of aluminum alloy improves the overall safety of the device.

[0051] Preferably, a slide groove is provided on the inner side wall of the base box, and the edge of the BMS circuit board is arranged in the slide groove.

[0052] The setting of the slide groove allows the operator to slide the edge of the BMS circuit board into the bottom box through the slide groove, thereby achieving the positioning and installation of the BMS circuit board.

[0053] Preferably, a plurality of support members are provided on the bottom surface of the BMS circuit board, and two ends of the support members are in contact with the BMS circuit board and the bottom plate respectively.

[0054] The provision of several support members not only supports the BMS circuit board, but also presses the BMS circuit board tightly into the slide groove, thereby improving the tightness between the BMS circuit board and the bottom box, and preventing the device from being damaged by external vibration.

[0055] The support member may be a support column, and a small roller may be connected to the bottom of the support column.

[0056] The above description is only a preferred embodiment of the present invention, which is used to assist those skilled in the art to implement the corresponding technical solution, and is not used to limit the scope of protection of the present invention, which is defined by the appended claims. It should be pointed out that for those of ordinary skill in the art, a number of equivalent improvements and variations can be made based on the technical solution of the present invention, and these improvements and variations should also be regarded as within the scope of protection of the present invention. At the same time, it should be understood that although this specification is described in accordance with the above-mentioned embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions of each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery charge and discharge monitoring device, comprising a housing and a BMS circuit board (1) disposed in an inner cavity of the housing, wherein the housing comprises a bottom box with an opening at the top and a top cover above the bottom box, characterized in that: The bottom box comprises a bottom box body (2) and a front box cover (3) detachably connected to the bottom box body, the bottom box body comprises a bottom plate (4), side plates (5) on the left and right sides of the bottom plate and a rear end plate (6) on the rear side of the bottom plate, the side plates and the rear end plate are fixedly connected to the bottom plate, a front baffle (7) is fixedly provided on the inner side wall of the front box cover, the bottom end of the front baffle is fixedly provided on the inner side wall of the front box cover, a front positioning groove (8) is formed between the front baffle and the front box cover, a rear baffle (9) is provided on the rear end plate, the bottom end of the rear baffle is fixedly provided on the top end of the rear end plate, the top cover comprises a cover plate (10), a connecting plate (11) fixedly connected to the cover plate is provided on the periphery of the cover plate, the connecting plate on the front side of the cover plate is provided in the positioning groove, the connecting plate on the rear side of the cover plate is located on the outside of the rear end plate, the connecting plates on the left and right sides of the cover plate are in contact with the top of the side plates, and the front box cover, the front baffle and the connecting plate on the front side of the cover plate are fixedly connected by screws (12).

2. The battery charge and discharge monitoring device according to claim 1, wherein: A display screen is provided on the top cover.

3. The battery charge and discharge monitoring device according to claim 1, wherein: A plurality of interfaces are arranged on the side wall of the bottom box body.

4. The battery charge and discharge monitoring device according to claim 1, wherein: The housing is made of aluminum alloy.

5. The battery charge and discharge monitoring device according to claim 1, wherein: A slide groove is provided on the inner side wall of the bottom box, and the edge of the BMS circuit board is arranged in the slide groove.

6. The battery charge and discharge monitoring device according to claim 5, characterized in that: The bottom surface of the BMS circuit board is provided with a plurality of support members, and two ends of the support members are in contact with the BMS circuit board and the bottom plate respectively.

Images