Charging and discharging control circuit suitable for positive and negative connection of battery

Abstract

The utility model discloses a charge-discharge control circuit suitable for positive and negative connection of a battery, and relates to the technical field of battery production. The charging and discharging control circuit comprises an MCU, an MOS tube driving chip, MOS tubes Q1-Q4, resistors R1-R5, an inductor L1 and a battery. Wherein the drain electrode of the MOS tube Q1 and the drain electrode of the MOS tube Q3 are both connected with a power supply I +; the drain electrode of the MOS tube Q2 and the source electrode of the MOS tube Q1 are both connected with one end of the inductor L1; the inductor L1 is connected with one end of the battery through the resistor R2; the source electrode of the MOS tube Q3 and the drain electrode of the MOS tube Q4 are connected with the other end of the battery; the source electrode of the MOS tube Q2 and the source electrode of the MOS tube Q4 are both grounded. According to the charge and discharge control circuit suitable for the positive and negative connection of the battery, normal charge and discharge of the battery can be realized without replacing an external cable when the battery is changed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a charge and discharge control circuit suitable for positive and negative connection of batteries. Background Art

[0002] In the existing lithium battery production field, the battery's external dimensions and pole direction vary widely, and some changes are often made to match the pack battery module method. The positive and negative poles of the single battery may be the same size, but the poles are opposite. After the production of this type of battery, when the general battery equipment is used for replacement, it can only be solved by replacing the external cables, which requires a lot of manpower and material resources to complete, resulting in financial losses, and the replacement cycle is long, delaying the production progress. The cable may be connected incorrectly during the replacement, posing a safety hazard. Utility Model Content

[0003] The utility model aims to provide a charge and discharge control circuit suitable for positive and negative connection of batteries, which can realize normal charge and discharge of the batteries without replacing external cables when the batteries are replaced.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] A charge and discharge control circuit suitable for positive and negative connection of a battery, comprising: an MCU, a MOS tube driving chip, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1 and a battery;

[0006] The MCU is connected to the MOS tube driver chip through a communication interface; the INH1 pin of the MOS tube driver chip is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the gate of the MOS tube Q1; the drain of the MOS tube Q1 and the drain of the MOS tube Q3 are both connected to the power supply I+; the INH2 pin of the MOS tube driver chip is connected to one end of the resistor R3; the other end of the resistor R3 is connected to the gate of the MOS tube Q2; the drain of the MOS tube Q2 and the source of the MOS tube Q1 are both connected to one end of the inductor L1; the inductor L1 The other end of the resistor R2 is connected to one end of the battery; the other end of the resistor R2 is connected to one end of the battery; the INH3 pin of the MOS tube driving chip is connected to one end of the resistor R4; the other end of the resistor R4 is connected to the gate of the MOS tube Q3; the INH4 pin of the MOS tube driving chip is connected to one end of the resistor R5; the other end of the resistor R5 is connected to the gate of the MOS tube Q4; the source of the MOS tube Q3 and the drain of the MOS tube Q4 are both connected to the other end of the battery; the source of the MOS tube Q2 and the source of the MOS tube Q4 are both grounded.

[0007] Optionally, one end of the battery is the positive electrode of the battery, and the other end of the battery is the negative electrode of the battery.

[0008] Optionally, one end of the battery is the negative electrode of the battery, and the other end of the battery is the positive electrode of the battery.

[0009] Optionally, the MCU is a STM32103VC series chip.

[0010] Optionally, the VCC pin of the MOS tube driver chip is connected to the positive electrode of the power supply; and the VEE pin of the MOS tube driver chip is connected to the power supply ground.

[0011] Optionally, the MOS transistor Q1 , the MOS transistor Q2 , the MOS transistor Q3 , and the MOS transistor Q4 are all NMOS transistors.

[0012] Optionally, the resistor R1 , the resistor R3 , the resistor R4 , and the resistor R5 are all 2K ohm resistors.

[0013] Optionally, the resistor R2 is a 0 ohm resistor.

[0014] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects:

[0015] The utility model provides a charge and discharge control circuit suitable for positive and negative connection of a battery, including: an MCU, a MOS tube driver chip, MOS tubes Q1-Q4, resistors R1-R5, an inductor L1 and a battery. The charge and discharge control circuit suitable for positive and negative connection of a battery provided by the utility model can achieve rapid type change when the directions of the positive and negative poles of the battery are inconsistent, without changing the hardware wiring method, and solves the problem of difficult type change through a control circuit switched by a soft switch with one key, that is, when the battery is changed, it is not necessary to replace the external cables to achieve normal charging and discharging of the battery, saving manpower and material costs and avoiding financial losses. In addition, the charge and discharge control circuit of the utility model has a short type change cycle, which avoids safety hazards such as wrong cable connection caused by a long type change cycle that delays production progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The utility model provides a charging and discharging control circuit schematic diagram suitable for positive and negative connection of batteries;

[0018] Figure 2 The conductive principle diagram of the MOS tube in the forward charging state of the charge and discharge control circuit suitable for the forward and reverse connection of the battery provided by the utility model;

[0019] Figure 3 The conductive principle diagram of the MOS tube in the reverse charging state of the charge and discharge control circuit suitable for the positive and reverse connection of the battery provided by the utility model;

[0020] Figure 4 The conductive principle diagram of the MOS tube in the forward discharge state of the charge and discharge control circuit suitable for the positive and reverse connection of the battery provided by the utility model;

[0021] Figure 5 The utility model provides a conductive principle diagram of a MOS tube in a reverse discharge state for a charge and discharge control circuit suitable for positive and reverse connection of a battery. DETAILED DESCRIPTION

[0022] 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.

[0023] The utility model aims to provide a charge and discharge control circuit suitable for positive and negative connection of batteries, which can realize normal charge and discharge of the batteries without replacing external cables when the batteries are replaced.

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown, the utility model discloses a charge and discharge control circuit suitable for positive and negative connection of a battery, comprising: an MCU, a MOS tube driver chip, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1 and a battery. The MCU is an STM32103VC series chip; and the MOS tubes are all NMOS tubes.

[0026] Specifically, the MCU is connected to the MOS tube driver chip through the communication interface. The INH1 pin of the MOS tube driver chip is connected to one end of the resistor R1. The other end of the resistor R1 is connected to the gate of the MOS tube Q1. The drain of the MOS tube Q1 and the drain of the MOS tube Q3 are both connected to the power supply I+. The INH2 pin of the MOS tube driver chip is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the gate of the MOS tube Q2. The drain of the MOS tube Q2 and the source of the MOS tube Q1 are both connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to one end of the battery. The INH3 pin of the MOS tube driver chip is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the gate of the MOS tube Q3. The INH4 pin of the MOS tube driver chip is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the gate of the MOS tube Q4. The source of the MOS tube Q3 and the drain of the MOS tube Q4 are both connected to the other end of the battery. The source of the MOS tube Q2 and the source of the MOS tube Q4 are both grounded. The VCC pin of the MOS tube driver chip is connected to the positive pole of the power supply, and the VEE pin is connected to the power supply ground.

[0027] Preferably, the resistors R1, R3, R4 and R5 may be 2K ohm resistors. Since the resistor R2 is used as a fuse to sample the current, the resistor R2 is a 0 ohm resistor.

[0028] As a specific embodiment, one end of the battery is the positive electrode of the battery, and the other end of the battery is the negative electrode of the battery.

[0029] As another specific embodiment, one end of the battery is the negative electrode of the battery, and the other end of the battery is the positive electrode of the battery.

[0030] Based on the charge and discharge control circuit suitable for positive and negative connection of the battery provided by the utility model, the MCU therein can collect the voltage information of the battery or receive the instruction of the software program for battery replacement, and then output different signals to the MOS tube driver chip LOOP through a pre-set program according to the received information. The INH1-INH4 pin output of the MOS tube driver chip LOOP is connected to the control pin (gate) of the MOS tube Q1-Q4, which can control the conduction and shutdown of the MOS tube Q1-Q4, thereby driving the MOS tube to perform corresponding execution actions, and realize the positive and negative direction charging and discharging of the battery. The MOS tube part composed of the MOS tube Q1-Q4, the resistor R1-R5, the inductor L1 and the battery is the final execution circuit, which can independently control any battery to switch between the four states of forward charging, reverse charging, forward discharging and reverse discharging.

[0031] It should be noted that the utility model is applicable to the charging and discharging control circuit of the battery with positive and negative connection, and the key protection is the connection relationship between the various devices. The various devices or chips used are finished products with preset working procedures. The utility model does not make any improvements to its software program, which will not be repeated here.

[0032] like Figure 2 As shown, Figure 2 The INH1~INH4 pins of the MOS tube driver chip LOOP output control signals to control the MOS tubes Q1 and Q4 to be turned on, and the MOS tubes Q2 and Q3 to be turned off, so that the current passes through the power supply I+, flows through the MOS tube Q1, and then passes through the inductor L1, flows into the resistor R2, passes through the positive electrode of the battery to the negative electrode, and then flows to the main power ground through the MOS tube Q4, completing the process of positive charging the battery.

[0033] like Figure 3 As shown, Figure 3 The INH1~INH4 pins of the MOS tube driver chip LOOP output control signals to control the MOS tubes Q1 and Q4 to turn off, and the MOS tubes Q2 and Q3 to turn on. The current passes through the power supply I+, flows through the MOS tube Q3, and then passes through the negative electrode of the battery to the positive electrode, flows into the resistor R2, passes through the inductor L1, and then flows through the MOS tube Q2 to the main power ground, completing the process of reverse charging the battery.

[0034] like Figure 4 As shown, Figure 4The INH1~INH4 pins of the MOS tube driver chip LOOP output control signals to control the MOS tubes Q1 and Q4 to turn on, and the MOS tubes Q2 and Q3 to turn off. The current passes through the positive electrode of the battery, flows into the resistor R2, and then passes through the inductor L1, flows through the MOS tube Q1 to the power supply I+, flows through the MOS tube Q2 to the power supply ground, and then flows to the negative electrode of the battery through the MOS tube Q4, completing the process of forward discharging the battery.

[0035] like Figure 3 As shown, Figure 5 When the battery is reversed, the INH1~INH4 pins of the MOS tube driver chip LOOP output control signals to control the MOS tubes Q1 and Q4 to be turned off, and the MOS tubes Q2 and Q3 to be turned on. The current passes through the positive electrode of the battery, flows through the MOS tube Q3, passes through the power supply I+ to the power supply ground, and then passes through the MOS tube Q2, flows into the resistor R2 through the inductor L1, and finally flows to the negative electrode of the battery, completing the process of reverse discharging the battery.

[0036] The utility model is based on the energy feedback battery capacity splitting device. When used on the lithium battery capacity splitting device, by adding a charge and discharge control circuit suitable for the positive and negative connection of the battery, it can adapt to the installation of the battery in any positive and negative direction. According to the positive and negative directions of the battery, the positive and negative installed batteries are normally charged and discharged, thereby improving efficiency. In addition, the charge and discharge control circuit suitable for the positive and negative connection of the battery can be used for battery destructive experiments, and does not require other external power supply. It can realize the battery discharge to 0V or negative voltage control, and can meet the laboratory battery over-discharge simulation control.

[0037] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A charge and discharge control circuit suitable for positive and negative connection of a battery, characterized in that: include: MCU, MOS tube driver chip, MOS tube Q1, MOS tube Q2, MOS tube Q3, MOS tube Q4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, inductor L1 and battery; The MCU is connected to the MOS tube driver chip through a communication interface; the INH1 pin of the MOS tube driver chip is connected to one end of the resistor R1; the other end of the resistor R1 is connected to the gate of the MOS tube Q1; the drain of the MOS tube Q1 and the drain of the MOS tube Q3 are both connected to the power supply I+; the INH2 pin of the MOS tube driver chip is connected to one end of the resistor R3; the other end of the resistor R3 is connected to the gate of the MOS tube Q2; the drain of the MOS tube Q2 and the source of the MOS tube Q1 are both connected to one end of the inductor L1; the inductor L1 The other end of the resistor R2 is connected to one end of the battery; the other end of the resistor R2 is connected to one end of the battery; the INH3 pin of the MOS tube driving chip is connected to one end of the resistor R4; the other end of the resistor R4 is connected to the gate of the MOS tube Q3; the INH4 pin of the MOS tube driving chip is connected to one end of the resistor R5; the other end of the resistor R5 is connected to the gate of the MOS tube Q4; the source of the MOS tube Q3 and the drain of the MOS tube Q4 are both connected to the other end of the battery; the source of the MOS tube Q2 and the source of the MOS tube Q4 are both grounded.

2. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: One end of the battery is the positive electrode of the battery, and the other end of the battery is the negative electrode of the battery.

3. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: One end of the battery is the negative electrode of the battery, and the other end of the battery is the positive electrode of the battery.

4. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: The MCU is a STM32103VC series chip.

5. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: The VCC pin of the MOS tube driving chip is connected to the positive electrode of the power supply; the VEE pin of the MOS tube driving chip is connected to the power supply ground.

6. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: The MOS transistor Q1 , the MOS transistor Q2 , the MOS transistor Q3 , and the MOS transistor Q4 are all NMOS transistors.

7. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: The resistor R1 , the resistor R3 , the resistor R4 , and the resistor R5 are all 2K ohm resistors.

8. The charge and discharge control circuit suitable for positive and negative connection of a battery according to claim 1, characterized in that: The resistor R2 is a 0 ohm resistor.

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