CN218182421U

CN218182421U - Lithium ion battery module

Info

Publication number: CN218182421U
Application number: CN202222149484.9U
Authority: CN
Inventors: 刘爱芳; 张江涛
Original assignee: Taiyuan Institute of Technology
Current assignee: Taiyuan Institute of Technology
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-30
Anticipated expiration: 2032-08-16

Abstract

The utility model discloses a lithium ion battery module, including group battery, circuit board, first MOSFET pipe, second MOSFET pipe and shunt resistance, the grid of first MOSFET pipe and the grid of second MOSFET pipe all with the circuit board electricity is connected, the drain electrode of first MOSFET pipe and the drain electrode of second MOSFET pipe interconnect, the source electrode of first MOSFET pipe and the positive pole of group battery are connected, the source electrode of second MOSFET pipe is the positive terminal of lithium ion battery module; the high-voltage end of the shunt resistor is connected with the negative electrode of the battery pack, and the low-voltage end of the shunt resistor is the negative electrode end of the lithium ion battery module; the high-voltage end and the low-voltage end are electrically connected with the circuit board; the battery pack comprises a plurality of lithium ion batteries which are connected in series, and two ends of each lithium ion battery are electrically connected with the circuit board. The utility model provides a lithium ion battery module, this lithium ion battery module standardization level is high, the battery is changed conveniently, the maintenance cost is low.

Description

Lithium ion battery module

Technical Field

The utility model relates to a lithium battery technology field, in particular to lithium ion battery module.

Background

Because of the problems of low energy density and environmental pollution of lead-acid batteries, the replacement of lead-acid batteries by lithium ion batteries is a necessary trend of environmental requirements, and particularly in the fields of electric tools and electric two-wheeled tricycles, the replacement of lead batteries by lithium batteries has the absolute advantages of portability, long endurance, low noise, short charging time and the like.

However, the biggest problem is that the standardization degree of industries such as electric tools and the like is extremely low, the electric tools and the like do not have uniform specification and model, only can be made into fixed 48V/60V and the like, and the standardization degree is low; in addition, the lead-acid battery is easier to maintain, a problem unit can be directly replaced, the maintenance cost is low, the lithium battery is inconvenient to replace the lead-acid battery, a module of the lithium battery is not easy to split, the whole battery needs to be replaced by the lithium battery, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lithium ion battery module, this lithium ion battery module standardization level is high, the battery is changed conveniently, the maintenance cost is low to the not enough of prior art.

The utility model discloses a following technical scheme realizes:

a lithium ion battery module comprises a battery pack, a circuit board, a first MOSFET, a second MOSFET and a shunt resistor, wherein a grid of the first MOSFET and a grid of the second MOSFET are electrically connected with the circuit board, a drain of the first MOSFET and a drain of the second MOSFET are connected with each other, a source of the first MOSFET is connected with a positive electrode of the battery pack, and a source of the second MOSFET is a positive electrode end of the lithium ion battery module; the high-voltage end of the shunt resistor is connected with the negative electrode of the battery pack, and the low-voltage end of the shunt resistor is the negative electrode end of the lithium ion battery module; the high-voltage end and the low-voltage end are electrically connected with the circuit board; the battery pack comprises a plurality of lithium ion batteries which are connected in series, and two ends of each lithium ion battery are electrically connected with the circuit board.

Furthermore, the lithium ion battery module further comprises a plurality of low-pass filter circuits, and the low-pass filter circuits are arranged between the lithium ion battery and the circuit board.

Further, the low-pass filter circuit comprises a resistor and a capacitor, the resistor is connected between the anode of the lithium ion battery and the circuit board in series, one end of the capacitor is connected between the resistor and the circuit board, and the other end of the capacitor is connected between the cathode of the lithium ion battery and the circuit board.

Furthermore, the lithium ion battery module further comprises a filter circuit, one end of the filter circuit is connected with the shunt resistor in parallel, and the other end of the filter circuit is connected with the circuit board.

Further, the filter circuit comprises a resistor R6, a resistor R7 and a capacitor C5, wherein one end of the resistor R6 is connected with the high-voltage end of the shunt resistor, and the other end of the resistor R6 is connected with the first interface of the circuit board; resistance R7 one end with shunt resistance's low-voltage end is connected, the other end with the second interface connection of circuit board, electric capacity C5 one end is connected between first interface and resistance R6, the other end is connected between second interface and resistance R7.

Furthermore, a charging interface and a discharging interface are arranged on the circuit board, the charging interface is connected with the grid electrode of the first MOSFET, and the discharging interface is connected with the grid electrode of the second MOSFET.

Furthermore, a voltage input interface is further arranged on the circuit board, and the voltage input interface is connected with the lithium ion battery.

Compared with the prior art, the utility model has the advantages of:

1. by designing the lithium ion battery module, the grid electrode of the first MOSFET and the grid electrode of the second MOSFET are electrically connected with the circuit board, the drain electrode of the first MOSFET and the drain electrode of the second MOSFET are mutually connected, the source electrode of the first MOSFET is connected with the anode of the battery pack, and the source electrode of the second MOSFET is the anode end of the lithium ion battery module; the high-voltage end of the shunt resistor is connected with the negative electrode of the battery pack, and the low-voltage end of the shunt resistor is the negative electrode end of the lithium ion battery module; the high-voltage end and the low-voltage end are electrically connected with the circuit board; the battery pack comprises a plurality of lithium ion batteries which are connected in series, and two ends of each lithium ion battery are electrically connected with the circuit board. The low-pass filter circuit is arranged between the lithium ion battery and the circuit board. One end of the filter circuit is connected with the shunt resistor in parallel, and the other end of the filter circuit is connected with the circuit board. The invention modularizes the lithium ion battery, reduces the development cost, and simultaneously can realize the generation of mass standardization.

Drawings

Fig. 1 is a schematic circuit diagram of a lithium ion battery module according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a battery module in use.

1. A battery pack; 10. a lithium ion battery; 2. a circuit board; 20. a first interface; 21. a second interface; 22. a charging interface; 23. a discharge interface; 24. a voltage input interface; 3. a first MOSFET; 4. a second MOSFET tube; 5. a shunt resistor; 50. a high-voltage end; 51. a low voltage end; 6. a low-pass filter circuit; 60. a resistance; 61. a capacitor; 7. a filter circuit; 8. a positive terminal; 9. and a negative terminal.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, the lithium ion battery module according to an embodiment of the present invention includes a battery pack 1, a circuit board 2, a first MOSFET tube 3, a second MOSFET tube 4, a shunt resistor 5, a filter circuit 7 and a plurality of low pass filter circuits 6, wherein a gate of the first MOSFET tube 3 and a gate of the second MOSFET tube 4 are both electrically connected to the circuit board 2, a drain of the first MOSFET tube 3 and a drain of the second MOSFET tube 4 are connected to each other, a source of the first MOSFET tube 3 is connected to an anode of the battery pack 1, and a source of the second MOSFET tube 4 is an anode terminal 8 of the lithium ion battery module; the high-voltage end 50 of the shunt resistor 5 is connected with the negative electrode of the battery pack 1, and the low-voltage end 51 of the shunt resistor 5 is the negative electrode end 9 of the lithium ion battery module; the high-voltage end 50 and the low-voltage end 51 are both electrically connected with the circuit board 2; the battery pack 1 includes a plurality of lithium ion batteries 10 connected in series with each other, and both ends of the lithium ion batteries 10 are electrically connected to the circuit board 2. The low-pass filter circuit 6 is provided between the lithium ion battery 10 and the circuit board 2. One end of the filter circuit 7 is connected with the shunt resistor 5 in parallel, and the other end is connected with the circuit board 2. The invention modularizes the lithium ion battery, reduces the development cost, and simultaneously can realize the generation of mass standardization.

The circuit board 2 is provided with a charging interface 22, a discharging interface 23 and a voltage input interface 24, the charging interface 22 is connected with the grid electrode of the first MOSFET 3, and the discharging interface 23 is connected with the grid electrode of the second MOSFET 4; the voltage input interface 24 is connected to the li-ion battery 10.

The low-pass filter circuit 6 comprises a resistor 60 and a capacitor 61, wherein the resistor 60 is connected between the anode of the lithium ion battery 10 and the circuit board 2 in series, one end of the capacitor 61 is connected between the resistor 60 and the circuit board 2, and the other end of the capacitor 61 is connected between the cathode of the lithium ion battery 10 and the circuit board 2.

The filter circuit 7 comprises a resistor R6, a resistor R7 and a capacitor C5, one end of the resistor R6 is connected with the high-voltage end 50 of the shunt resistor 5, and the other end of the resistor R6 is connected with the first interface 20 of the circuit board 2; one end of the resistor R7 is connected with the low-voltage end 51 of the shunt resistor 5, the other end of the resistor R is connected with the second interface 21 of the circuit board 2, one end of the capacitor C5 is connected between the first interface 20 and the resistor R6, and the other end of the capacitor C5 is connected between the second interface 21 and the resistor R7. When current flows through the shunt resistor 5, the voltage signal on the shunt resistor 5 is filtered by the filter circuit 7, noise waves are filtered, and then the voltage signal is sent to the circuit board 2 through the first interface 20 and the second interface 21, and the circuit board 2 is processed to obtain the charging and discharging current of the battery pack 1.

The single lithium ion battery 10 of the battery module enters the voltage input interface 24 after passing through the low-pass filter circuit 6, the circuit board 2 performs ADC (analog to digital converter) conversion on the single-string voltage to obtain a single-string voltage value, the circuit is controlled by monitoring the magnitude of the single-string voltage, namely the first MOSFET (metal oxide semiconductor field effect transistor) tube 3 and the second MOSFET tube 4 are controlled by the charging interface 22 and the discharging interface 23 respectively. The filter circuit 7 filters noise waves of the voltage signals on the shunt resistor 5 and then sends the noise waves into the circuit board 2 through the first interface 20 and the second interface 21, the circuit board 2 obtains charging and discharging currents of the battery pack 1, and the first MOSFET tube 3 and the second MOSFET tube 4 can be controlled according to the current.

During charging, the circuit board 2 controls the first MOSFET tube 3 to be opened, the charging current loop enters from the positive electrode end 8 and flows out from the negative electrode end 9 after sequentially passing through the parasitic diode of the second MOSFET tube 4, the first MOSFET tube 3 and the battery pack 1. In order to reduce the loss of the second MOSFET tube 4, the circuit board 2 controls the second MOSFET tube 4 to be opened, so that the current is ensured to directly conduct the second MOSFET tube 4, and the conduction loss is far lower than the loss of the parasitic diode in the body, thereby improving the charging efficiency.

During discharging, the circuit board 2 controls the second MOSFET tube 4 to be opened, and a discharging current loop flows in from the negative electrode end 9, sequentially passes through the battery pack 1, the parasitic diode of the first MOSFET tube 3 and the second MOSFET tube 4, and then flows out from the positive electrode end 8. In order to reduce the loss of the first MOSFET tube 3, the circuit board 2 controls the first MOSFET tube 3 to be opened, so that the current is ensured to directly conduct the first MOSFET tube 3, and the conduction loss is far lower than the loss of the parasitic diode in the body, thereby improving the charging efficiency.

As shown in fig. 2, by using the above-mentioned multiple lithium ion battery modules, the lithium ion battery modules can be designed to be connected in series and parallel to expand the voltage of the series output and the total capacity of the parallel batteries.

In the case of adopting 4 battery modules, when the common end 2 of the relays K1-K4 contacts 3, the battery modules 1-4 are respectively connected in parallel after passing through the diodes D1-D4, the parallel positive and negative electrodes output about 12V, and at the moment, A1 and A2 are respectively the positive and negative electrodes of the parallel circuit; when the common end of the relays K1-K4 is in contact with the relay 1, the battery module and the battery module 4 are connected in series, the output voltage of the series positive electrode and the series negative electrode is 48V, and at the moment, B1 and B2 are the positive electrode and the negative electrode of the parallel circuit respectively. The purpose of expanding the voltage output in series and the total capacity of the batteries connected in parallel is achieved by properly expanding the number of the battery modules, the diodes and the relays.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lithium ion battery module is characterized by comprising a battery pack (1), a circuit board (2), a first MOSFET (metal oxide semiconductor field effect transistor) tube (3), a second MOSFET tube (4) and a shunt resistor (5), wherein the grid electrode of the first MOSFET tube (3) and the grid electrode of the second MOSFET tube (4) are electrically connected with the circuit board (2), the drain electrode of the first MOSFET tube (3) and the drain electrode of the second MOSFET tube (4) are connected with each other, the source electrode of the first MOSFET tube (3) is connected with the anode of the battery pack (1), and the source electrode of the second MOSFET tube (4) is the positive electrode end (8) of the lithium ion battery module; the high-voltage end (50) of the shunt resistor (5) is connected with the negative electrode of the battery pack (1), and the low-voltage end (51) of the shunt resistor (5) is the negative electrode end (9) of the lithium ion battery module; the high-voltage end (50) and the low-voltage end (51) are electrically connected with the circuit board (2); the battery pack (1) comprises a plurality of lithium ion batteries (10) which are connected in series, and two ends of each lithium ion battery (10) are electrically connected with the circuit board (2).

2. The lithium ion battery module according to claim 1, characterized in that it further comprises a plurality of low pass filter circuits (6), said low pass filter circuits (6) being arranged between the lithium ion battery (10) and a circuit board (2).

3. The lithium ion battery module according to claim 2, characterized in that the low pass filter circuit (6) comprises a resistor (60) and a capacitor (61), the resistor (60) is connected in series between the positive pole of the lithium ion battery (10) and the circuit board (2), one end of the capacitor (61) is connected between the resistor (60) and the circuit board (2), and the other end is connected between the negative pole of the lithium ion battery (10) and the circuit board (2).

4. The lithium ion battery module according to claim 1, further comprising a filter circuit (7), wherein one end of the filter circuit (7) is connected in parallel with the shunt resistor (5), and the other end is connected with the circuit board (2).

5. The lithium ion battery module according to claim 4, characterized in that the filter circuit (7) comprises a resistor R6, a resistor R7 and a capacitor C5, wherein one end of the resistor R6 is connected with the high voltage end (50) of the shunt resistor (5), and the other end is connected with the first interface (20) of the circuit board (2); resistance R7 one end with low-voltage end (51) of shunt resistance (5) are connected, the other end and second interface (21) of circuit board (2) are connected, electric capacity C5 one end is even between first interface (20) and resistance R6, the other end is connected between second interface (21) and resistance R7.

6. The lithium ion battery module according to claim 1, wherein a charging interface (22) and a discharging interface (23) are provided on the circuit board (2), the charging interface (22) is connected to the gate of the first MOSFET (3), and the discharging interface (23) is connected to the gate of the second MOSFET (4).

7. The lithium ion battery module according to claim 1, characterized in that a voltage input interface (24) is further provided on the circuit board (2), and the voltage input interface (24) is connected with the lithium ion battery (10).