Large-current multi-MOS (Metal Oxide Semiconductor) parallel current sharing device and battery pack with same

Abstract

The utility model discloses a large-current current sharing device with multiple parallel-connected MOS (metal oxide semiconductor), which solves the problem of unbalanced current of multiple MOS tubes on a circuit board in a battery pack. The circuit board comprises a circuit board and a plurality of MOS tubes, the circuit board is provided with a first conductive part and a second conductive part, the plurality of MOS tubes are linearly arranged between the first conductive part and the second conductive part, and access pins and outgoing pins of the MOS tubes are electrically connected with the first conductive part and the second conductive part respectively. A first conductive plate and a second conductive plate are arranged at the positions where the first conductive part and the second conductive part are located respectively, the first conductive plate and the second conductive plate are electrically connected with the first conductive part and the second conductive part respectively, and one end of the first conductive plate is a current input end; and one end, far away from the current input end, of the second conductive plate is a current output end. The current sharing device has the advantages of being simple in structure, good in current sharing effect and the like, and effectively prevents a certain MOS tube from being burnt out due to overload.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a high-current current sharing device with multiple MOS transistors connected in parallel and a battery pack having the same. Background Technology

[0002] The battery pack comprises multiple cells connected in series and parallel. Several cells are placed inside the battery system housing and then connected in series and parallel via wires. The battery pack contains a circuit board with multiple MOSFETs connected in parallel on the board. Since the current input and output terminals of the circuit board are located on the same side, current flows in from the input terminal, then sequentially through the multiple parallel MOSFETs, and finally out from the output terminal on the same side of the board. This results in inconsistent circuit lengths for each MOSFET, leading to inconsistent current flow through each MOSFET. Some MOSFETs carry larger currents, while others carry smaller currents. The uneven current flow across all MOSFETs, coupled with the limited current capacity of each MOSFET, means that MOSFETs carrying excessive current may burn out, affecting the normal operation of the circuit board. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems by designing a high-current multiple MOS parallel-connected current sharing device and a battery pack with it, which solves the problem of insufficient current balance among multiple MOS transistors on the circuit board of the battery pack.

[0004] To achieve the above objectives, the technical solution of this utility model is a current sharing device for multiple MOS transistors connected in parallel, comprising a circuit board and multiple MOS transistors. The multiple MOS transistors are connected in parallel on the circuit board, which has a first conductive part and a second conductive part. The multiple MOS transistors are linearly arranged between the first conductive part and the second conductive part, and the input pin and output pin of the MOS transistors are electrically connected to the first conductive part and the second conductive part, respectively. The first conductive part and the second conductive part extend along the arrangement direction of the multiple MOS transistors. A first conductive plate and a second conductive plate are respectively disposed at the locations of the first conductive part and the second conductive part, and the first conductive plate and the second conductive plate are electrically connected to the first conductive part and the second conductive part, respectively. One end of the first conductive plate is the current input terminal, and the end of the second conductive plate away from the current input terminal is the current output terminal.

[0005] Preferably, multiple MOSFETs are arranged uniformly along a straight line.

[0006] Preferably, the circuit board has sockets on both sides of the multiple MOS transistors, and the opposite sides of the first conductive plate and the second conductive plate have bent connecting portions, which are welded and fixed in the sockets and electrically connected to the circuit board.

[0007] Preferably, the inner wall of the socket has a copper sheet, which is electrically connected to the circuit of the circuit board.

[0008] Preferably, the first conductive plate is electrically connected to the positive or negative electrode of the battery, and the second conductive plate is equipped with a terminal post.

[0009] Preferably, the first conductive plate and the second conductive plate are provided with mounting holes, and the circuit board is provided with relief holes that cooperate with the mounting holes.

[0010] This utility model also provides a battery pack, including a current sharing device with multiple high-current MOSFETs connected in parallel as described above.

[0011] Its advantages over existing technologies are:

[0012] This utility model's high-current multi-MOSFET parallel current sharing device has advantages such as simple structure and good current sharing effect, without requiring significant modifications to existing structures. Multiple MOSFETs are connected in parallel between the first and second conductive parts, with the input and output pins of the MOSFETs electrically connected to the first and second conductive parts, respectively. A first conductive plate and a second conductive plate are electrically connected to the first and second conductive parts, respectively. One end of the first conductive plate is the input terminal, and the other end of the second conductive plate is the output terminal. The input and output terminals are located at opposite ends of the circuit board. Current enters the circuit board through the first conductive plate, then flows simultaneously through the multiple MOSFETs, and finally exits from the other end of the circuit board through the second conductive plate. This ensures that the circuit length and current magnitude of all MOSFETs are consistent, thus achieving current sharing and preventing any single MOSFET from burning out due to excessive current.

[0013] This utility model also provides a battery pack that uses the aforementioned current sharing device. The first and second conductive plates act as conductors, which have a greater load capacity than wires and are less prone to damage from the sun. Moreover, the current sharing method used in this device does not require significant modifications to the battery pack structure, resulting in good current sharing performance and improved safety during battery pack use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the current sharing device of the present invention, which is a high-current multi-MOS connected in parallel.

[0015] Figure 2 This is a schematic diagram of the planar structure of the circuit board in this utility model;

[0016] Figure 3 This is a schematic diagram of a current sharing device with multiple MOSFETs connected in parallel for high current when current passes through some of the MOSFETs.

[0017] In the figure, 1 is the circuit board; 101 is the socket; 102 is the through hole; 2 is the MOSFET; 3 is the first conductive plate; 4 is the second conductive plate; 5 is the electrode post; 31 is the connection part; and 301 is the mounting hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Example 1

[0020] like Figure 1 As shown, this embodiment proposes a current sharing device for multiple MOS transistors connected in parallel with high current. The current sharing device is mainly composed of a circuit board 1, a first conductive plate 3, a second conductive plate 4, and multiple MOS transistors 2. The multiple MOS transistors 2 are connected in parallel on the circuit board 1, and the multiple MOS transistors 2 are distributed at equal intervals along a straight line on the circuit board 1. This makes the structure of the circuit board 1 more compact and the layout more reasonable.

[0021] On circuit board 1, several sockets 101 are respectively opened on both sides of multiple linearly arranged MOSFETs 2. The inner wall of each socket 101 is covered with a copper sheet, which is electrically connected to the circuit inside circuit board 1. All MOSFETs 2 are also electrically connected to the circuit inside circuit board 1. After the copper sheet becomes conductive, it can transfer current to the MOSFETs 2 through the circuit.

[0022] The socket and the copper plate cooperate to form the first conductive part and the second conductive part respectively, and all the MOS transistors 2 are located between the first conductive part and the second conductive part.

[0023] MOSFET 2 has two pins, an input pin and an output pin, which are soldered to circuit board 1 and electrically connected to its internal circuitry. Current flows into MOSFET 2 from the input pin and then flows out from the output pin.

[0024] The first conductive plate 3 serves as the current input side, and the second conductive plate 4 serves as the current output side. The first conductive plate 3 and the second conductive plate 4 are located on the left and right sides of the MOSFET 2, respectively, and are soldered to the circuit board 1.

[0025] like Figure 1 , Figure 2As shown, a socket 101 is provided on the circuit board 1, and the socket 101 is located on both sides of multiple MOSFETs 2 arranged linearly. Simultaneously, portions of the first conductive plate 3 and the second conductive plate 4 are bent on opposite sides to form connecting parts 31. These connecting parts 31 are inserted into the sockets 101 on the circuit board 1 and then soldered together. Current flows through the first conductive plate 3 into the circuit board 1, then through the multiple MOSFETs 2, and finally flows out from the second conductive plate 4.

[0026] You can refer to this. Figure 3 , Figure 3 This is a diagram showing the current flow. One end of the first conductive plate 3 is the current input terminal, while the end of the second conductive plate 4 furthest from the current input terminal is the current output terminal. In other words, the current input and output terminals are located at opposite ends of the circuit board 1. Current flows in from one end and out from the other, ensuring that the circuit length and magnitude of the current flowing to the multiple MOSFETs 2 are consistent, thus achieving current sharing.

[0027] Since the current passing through each MOSFET2 is the same, MOSFET2 will not burn out or be damaged due to excessive load.

[0028] To facilitate the fixing of the first conductive plate 3 and the second conductive plate 4, three mounting holes 301 are provided on both the first conductive plate 3 and the second conductive plate 4. At the same time, six through holes 102 are provided on the circuit board 1, three on each side of the MOS transistor 2, corresponding one-to-one with the mounting holes 301.

[0029] During installation, the protrusion on the battery pack housing passes through the relief hole 102 on the circuit board 1 to position the circuit board 1. Then, the screw passes through the mounting hole 301 on the first conductive plate 3 and the second conductive plate 4 and is threaded into the threaded hole on the protrusion, thereby fixing the first conductive plate 3 and the second conductive plate 4 to prevent them from moving, so as to ensure the firmness and good connection between the first conductive plate 3 and the second conductive plate 4 and the circuit board 1.

[0030] The first conductive plate 3 is usually connected to the positive or negative terminal of the battery cell, while the other terminal of the battery cell is electrically connected to the circuit board 1 through other components. A terminal post 5 is installed on the second conductive plate 4 for outputting current.

[0031] Example 2

[0032] This embodiment proposes a battery pack that employs a current-sharing device with multiple high-current MOSFETs connected in parallel, as described in the embodiment. Because the battery pack has advantages such as high energy density and high current intensity, this current-sharing device ensures that the current flowing through each MOSFET is balanced, improving the safety of the battery pack during use and preventing it from overheating and burning out due to overload.

[0033] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A current sharing device for high current multi-MOS parallel connection, comprising a circuit board (1) and a plurality of MOS transistors (2), characterized in that, A plurality of MOS transistors (2) are connected in parallel on the circuit board (1), the circuit board (1) has a first conductive part and a second conductive part, the plurality of MOS transistors (2) are arranged linearly between the first conductive part and the second conductive part, the access pin and the exit pin of the MOS transistor (2) are electrically connected with the first conductive part and the second conductive part respectively, the first conductive part and the second conductive part extend along the arrangement direction of the plurality of MOS transistors (2), the first conductive part and the second conductive part are respectively provided with a first conductive plate (3) and a second conductive plate (4), the first conductive plate (3) and the second conductive plate (4) are electrically connected with the first conductive part and the second conductive part respectively, wherein one end of the first conductive plate (3) is a current input end, and one end of the second conductive plate (4) away from the current input end is a current output end.

2. The current sharing device of claim 1, wherein, The plurality of MOS transistors (2) are arranged uniformly along a straight line direction.

3. The current sharing device of claim 1, wherein, The circuit board (1) is provided with a jack (101) on both sides of the plurality of MOS transistors (2), the opposite side of the first conductive plate (3) and the second conductive plate (4) is provided with a connection part (31) formed by bending, the connection part (31) is welded and fixed in the jack (101) and is electrically connected with the circuit board (1).

4. The current sharing device of claim 3, wherein, The inner wall of the jack (101) is provided with a copper sheet, and the copper sheet is electrically connected with the circuit of the circuit board (1).

5. The current sharing device of claim 1, wherein, The first conductive plate (3) is electrically connected with the positive electrode or the negative electrode of a battery, and the second conductive plate (4) is provided with a pole (5).

6. The current sharing device of claim 1, wherein, The first conductive plate (3) and the second conductive plate (4) are provided with a mounting hole (301), and the circuit board (1) is provided with a let hole (102) matched with the mounting hole (301).

7. A battery pack, characterized by, A current sharing device for a plurality of MOS transistors connected in parallel. A current sharing device for a plurality of MOS transistors connected in parallel.

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