An electric control box charging control circuit with a charging loop capable of automatic disconnection

Abstract

The utility model relates to a kind of electric control box charging control circuit with charging circuit capable of automatic disconnection, belong to battery charging technical field, comprising: the electric control box charging control circuit with automatic disconnection, pass through battery charging unit BCU, positive pole charging module and negative pole charging module, the intelligent charging management to battery pack module is realized, when battery pack module needs to be charged, battery charging unit BCU will be according to the voltage and current state of battery pack, intelligently adjust the output of positive pole charging module and negative pole charging module, ensure that battery pack can be safely, efficiently charged, when battery pack is fully charged, battery charging unit BCU will detect the voltage and current change of battery pack in time, and pass through control positive pole charging module and negative pole charging module, automatically disconnect charging circuit, avoid battery pack long time in float charging state, to effectively prolong the service life of battery pack, improve the security and stability of battery system.

Description

Technical Field

[0001] This utility model relates to the field of battery charging technology, specifically to a charging control circuit for an electrical control box that can automatically disconnect the charging circuit. Background Technology

[0002] In recent years, with the rapid development of the new energy industry, battery charging technology has received widespread attention and research. Intelligent battery charging is widely applicable to various occasions that require battery power, such as power systems, communication systems, and data centers. However, traditional charging methods have many shortcomings, such as safety hazards caused by long-term float charging and battery performance degradation. Although some existing circuits use simple time control or voltage threshold judgment methods to try to solve this problem, the time control method cannot accurately determine the actual full-charge time of batteries with different states and capacities, and the voltage threshold judgment method is easily affected by environmental factors and measurement errors, resulting in inaccurate judgment and the inability to reliably realize the function of automatically disconnecting the charging circuit after full charge. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a charging control circuit for an electrical control box that can automatically disconnect the charging circuit, so as to achieve accurate charging, avoid overcharging or undercharging, improve charging efficiency, ensure the safety and reliability of the charging process, and avoid safety hazards.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A charging control circuit for an electrical control box that can automatically disconnect the charging circuit includes:

[0006] The battery pack module includes a battery charging unit (BCU), a positive charging module, and a negative charging module. The battery charging unit (BCU) is connected to both the positive and negative charging modules. The positive charging module is connected to the positive terminal of the battery pack module, and the negative charging module is connected to the negative terminal of the battery pack module.

[0007] Preferably, the battery pack module includes battery pack 1, battery pack 2 and battery pack 3, which are connected in series.

[0008] Preferably, the interface of the battery charging unit BCU is provided with V24V_IN terminal, G24V_IN terminal, OUT0 terminal, OUT1 terminal and OUT2 terminal.

[0009] Preferably, an isolation transformer U1 is provided on one side of the battery charging unit. The interface of the isolation transformer U1 is provided with terminals XT1, XT2, XT3 and XT4. The G24V_IN terminal of the battery charging unit BCU is connected to the XT4 terminal of the isolation transformer U1. The OUT0, OUT1 and OUT2 terminals of the battery charging unit BCU are respectively provided with coils KM1, KM2 and KM3. Both ends of the KM1, KM2 and KM3 coils are provided with terminals A1 and A2. The OUT0 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM1 coil. The OUT1 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM2 coil. The OUT2 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM3 coil. The A2 terminals of the KM1, KM2 and KM3 coils are all connected to the XT4 terminal of the isolation transformer U1.

[0010] Preferably, a circuit breaker QF1 is provided on one side of the isolation transformer U1. The circuit breaker QF1 has two sets of opening and closing terminals. The XT1 terminal and XT2 terminal of the isolation transformer U1 are respectively connected to the two opening and closing terminals of the circuit breaker QF1.

[0011] Preferably, the positive charging module includes AC contactors KM1, KM2, and KM3, diodes D1, D2, and D3. The AC contactors KM1, KM2, and KM3 and diode D3 are connected in parallel. One end of the AC contactor KM3 is connected in series with the positive terminal of diode D1, and one end of the AC contactor KM2 is connected in series with one end of resistor R1.

[0012] Preferably, a manual maintenance switch MSD and a fuse FU1 are provided between the positive charging module and the battery pack module. One side of the positive charging module is provided with a 110V+ terminal, a permanent power supply terminal, an emergency charging positive terminal, a BMS power supply terminal, and a vehicle-mounted circuit breaker. The permanent power supply terminal and the emergency charging terminal provide energy. The negative terminal of diode D1, resistor R1, and one end of AC contactor KM1 are all connected to the positive terminal of diode D2 and the positive terminal of 110V+. One end of AC contactor KM1, AC contactor KM2, and AC contactor KM3 are connected to the negative terminal of diode D3, the manual maintenance switch MSD, and the vehicle-mounted circuit breaker. The other end of the manual maintenance switch MSD is connected to one end of fuse FU1, and the other end of fuse FU1 is connected to one end of the battery pack module.

[0013] Preferably, the negative terminal of diode D2 is connected to one connection terminal of circuit breaker QF1 and the BMS power supply terminal, and the BMS power supply terminal is also connected to the other end of the vehicle circuit breaker, and the positive terminal of diode D3 is connected to the emergency charging positive terminal.

[0014] Preferably, the negative charging module includes a current transformer TA and a fuse FU2. One side of the negative charging module is provided with a 110V- terminal and an emergency charging negative terminal. One end of the current transformer TA is connected to the 110V- terminal and the emergency charging negative terminal, and the other end of the current transformer TA is connected to one end of the fuse FU2. One end of the fuse FU2 is connected to one end of the battery pack module.

[0015] Preferably, the battery charging unit BCU is provided with a +15V input terminal, a -15V output terminal, and an M terminal, and the control connection terminal of the current transformer TA is connected to the +15V input terminal, the -15V output terminal, and the M terminal of the battery charging unit BCU.

[0016] Beneficial Effects: In the charging control circuit of the electrical control box of this utility model, which can automatically disconnect the charging circuit, the battery charging unit (BCU) intelligently controls the disconnection and connection of the positive and negative charging modules, realizing precise management of the battery pack charging process. This effectively avoids the safety hazards caused by long-term float charging in traditional charging methods, significantly improving the safety and stability of the battery system. In the positive charging module, the parallel design of AC contactors KM1, KM2, and KM3 ensures that the positive charging path can be quickly cut off after receiving a disconnection signal. At the same time, the current transformer (TA) and circuit breaker (QF1) in the negative charging module work together to further ensure that the charging circuit is completely disconnected, providing comprehensive protection for the battery pack. This effectively avoids the performance degradation of the battery pack caused by overcharging or long-term float charging, thereby significantly extending the service life of the battery pack. This not only reduces the user's maintenance costs but also improves the reliability and economy of the entire battery system. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the overall charging control circuit of the electrical control box that can automatically disconnect the charging circuit of this utility model;

[0020] Figure 2 This is a schematic diagram of the battery charging unit (BCU) of this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following text is only used to describe a charging control circuit of an electric control box that can automatically disconnect the charging circuit of the present utility model, and does not strictly limit the protection scope of the specific claims of the present utility model.

[0022] Example: Figure 1 and Figure 2 As shown, a charging control circuit for an electrical control box that can automatically disconnect the charging circuit includes:

[0023] Battery module, such as Figure 1 As shown, the battery charging unit (BCU), positive charging module, and negative charging module are connected. The battery charging unit (BCU) is connected to the positive charging module and the negative charging module. The positive charging module is connected to the positive terminal of the battery pack module, and the negative charging module is connected to the negative terminal of the battery pack module.

[0024] In an embodiment, such as Figure 1 As shown, the battery pack module includes battery pack Pack1, battery pack Pack2 and battery pack Pack3, which are connected in series.

[0025] In an embodiment, such as Figure 2 As shown, the interface of the battery charging unit BCU is provided with V24V_IN terminal, G24V_IN terminal, OUT0 terminal, OUT1 terminal and OUT2 terminal.

[0026] In an embodiment, such as Figure 2 As shown, an isolation transformer U1 is provided on one side of the battery charging unit. The interface of the isolation transformer U1 is provided with terminals XT1, XT2, XT3 and XT4. The G24V_IN terminal of the battery charging unit BCU is connected to the XT4 terminal of the isolation transformer U1. The OUT0, OUT1 and OUT2 terminals of the battery charging unit BCU are respectively provided with coils KM1, KM2 and KM3. Both ends of the KM1, KM2 and KM3 coils are provided with terminals A1 and A2. The OUT0 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM1 coil. The OUT1 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM2 coil. The OUT2 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM3 coil. The A2 terminals of the KM1, KM2 and KM3 coils are all connected to the XT4 terminal of the isolation transformer U1.

[0027] In an embodiment, such as Figure 2As shown, a circuit breaker QF1 is provided on one side of the isolation transformer U1. The circuit breaker QF1 has two sets of opening and closing terminals. The XT1 terminal and XT2 terminal of the isolation transformer U1 are respectively connected to the two opening and closing terminals of the circuit breaker QF1.

[0028] In an embodiment, such as Figure 1 As shown, the positive charging module includes AC contactors KM1, KM2, and KM3, diodes D1, D2, and D3. The AC contactors KM1, KM2, and KM3 and diode D3 are connected in parallel. One end of the AC contactor KM3 is connected in series with the positive terminal of diode D1, and one end of the AC contactor KM2 is connected in series with one end of resistor R1.

[0029] In an embodiment, such as Figure 1 As shown, a manual maintenance switch MSD and a fuse FU1 are provided between the positive charging module and the battery pack module. One side of the positive charging module is provided with a 110V+ terminal, a permanent power supply terminal, an emergency charging positive terminal, a BMS power supply terminal, and a vehicle-mounted circuit breaker. The permanent power supply terminal and the emergency charging terminal provide energy. The negative terminal of diode D1, resistor R1, and one end of AC contactor KM1 are all connected to the positive terminal of diode D2 and the positive terminal of 110V+. One end of AC contactor KM1, AC contactor KM2, and AC contactor KM3 is connected to the negative terminal of diode D3, the manual maintenance switch MSD, and the vehicle-mounted circuit breaker. The other end of the manual maintenance switch MSD is connected to one end of fuse FU1, and the other end of fuse FU1 is connected to one end of the battery pack module.

[0030] In an embodiment, such as Figure 1 As shown, the negative terminal of diode D2 is connected to one connection terminal of circuit breaker QF1 and the BMS power supply terminal. The BMS power supply terminal is also connected to the other end of the vehicle circuit breaker. The positive terminal of diode D3 is connected to the positive terminal of emergency charging.

[0031] In an embodiment, such as Figure 1 As shown, the negative charging module includes a current transformer TA and a fuse FU2. One side of the negative charging module is provided with a 110V- terminal and an emergency charging negative terminal. One end of the current transformer TA is connected to the 110V- terminal and the emergency charging negative terminal, and the other end of the current transformer TA is connected to one end of the fuse FU2. One end of the fuse FU2 is connected to one end of the battery pack module.

[0032] In an embodiment, such as Figure 2As shown, the battery charging unit BCU is provided with a +15V input terminal, a -15V output terminal, and an M terminal. The control connection terminal of the current transformer TA is connected to the +15V input terminal, the -15V output terminal, and the M terminal of the battery charging unit BCU.

[0033] In operation, once the battery pack module is fully charged, the battery charging unit (BCU) monitors the voltage and current status of the battery pack to determine if it is fully charged. At this point, the BCU sends control signals to the positive and negative charging modules, instructing them to disconnect from the battery pack. Upon receiving the disconnection signal, the AC contactors KM1, KM2, and KM3 in the positive charging module open their contacts, cutting off the positive charging path. Simultaneously, the current transformer TA in the negative charging module also receives the disconnection signal, stopping charging the negative terminal of the battery pack. After receiving a control signal from the battery charging unit (BCU), the circuit breaker QF1 will also disconnect its internal contacts, further ensuring that the charging circuit is completely cut off. Even if the external power supply is still connected, the battery pack will no longer accept charging, thus avoiding the safety hazards caused by long-term float charging. This design not only improves the safety and stability of the battery system, but also effectively extends the service life of the battery pack. The charging control circuit of the electrical control box, which can automatically disconnect the charging circuit, realizes intelligent charging management of the battery pack module through the coordinated work of the battery charging unit (BCU), the positive charging module, and the negative charging module.

[0034] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. For those skilled in the art, after learning the contents of the present utility model, they can make several equivalent changes and substitutions without departing from the principle of the present utility model. These equivalent changes and substitutions should also be considered to fall within the protection scope of the present utility model.

Claims

1. A charging control circuit for an electrical control box that can automatically disconnect the charging circuit, characterized in that: include: The battery pack module includes a battery charging unit (BCU), a positive charging module, and a negative charging module. The battery charging unit (BCU) is connected to both the positive and negative charging modules. The positive charging module is connected to the positive terminal of the battery pack module, and the negative charging module is connected to the negative terminal of the battery pack module.

2. The charging control circuit of the electrical control box that can automatically disconnect the charging circuit according to claim 1, characterized in that: The battery pack module includes battery pack Pack1, battery pack Pack2 and battery pack Pack3, which are connected in series.

3. The charging control circuit of the electrical control box that can automatically disconnect the charging circuit according to claim 1, characterized in that: The battery charging unit (BCU) has an interface with V24V_IN, G24V_IN, OUT0, OUT1 and OUT2 terminals.

4. The charging control circuit of the electrical control box that can automatically disconnect the charging circuit according to claim 3, characterized in that: An isolation transformer U1 is provided on one side of the battery charging unit. The interface of the isolation transformer U1 is provided with terminals XT1, XT2, XT3 and XT4. The G24V_IN terminal of the battery charging unit BCU is connected to the XT4 terminal of the isolation transformer U1. The OUT0, OUT1 and OUT2 terminals of the battery charging unit BCU are respectively provided with coils KM1, KM2 and KM3. Each of the KM1, KM2 and KM3 coils has terminals A1 and A2 at both ends. The OUT0 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM1 coil. The OUT1 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM2 coil. The OUT2 terminal of the battery charging unit BCU is connected to the A1 terminal of the KM3 coil. The A2 terminals of the KM1, KM2 and KM3 coils are all connected to the XT4 terminal of the isolation transformer U1.

5. A charging control circuit for an electrical control box that can automatically disconnect the charging circuit according to claim 4, characterized in that: The isolation transformer U1 is equipped with a circuit breaker QF1 on one side. The circuit breaker QF1 has two sets of opening and closing terminals. The XT1 terminal and XT2 terminal of the isolation transformer U1 are respectively connected to the two opening and closing terminals of the circuit breaker QF1.

6. The charging control circuit of the electrical control box that can automatically disconnect the charging circuit according to claim 1, characterized in that: The positive charging module includes AC contactors KM1, KM2, and KM3, diodes D1, D2, and D3. The AC contactors KM1, KM2, and KM3 and diode D3 are connected in parallel. One end of the AC contactor KM3 is connected in series with the positive terminal of diode D1, and one end of the AC contactor KM2 is connected in series with one end of resistor R1.

7. A charging control circuit for an electrical control box that can automatically disconnect the charging circuit according to claim 6, characterized in that: A manual maintenance switch (MSD) and a fuse (FU1) are provided between the positive charging module and the battery pack module. One side of the positive charging module is provided with a 110V+ terminal, a permanent power supply terminal, an emergency charging positive terminal, a BMS power supply terminal, and a vehicle-mounted circuit breaker. The permanent power supply terminal and the emergency charging terminal provide energy. The negative terminal of diode D1, resistor R1, and one end of AC contactor KM1 are all connected to the positive terminal of diode D2 and the positive terminal of 110V+. One end of AC contactors KM1, KM2, and KM3 is connected to the negative terminal of diode D3, the manual maintenance switch (MSD), and the vehicle-mounted circuit breaker. The other end of the manual maintenance switch (MSD) is connected to one end of fuse (FU1), and the other end of fuse (FU1) is connected to one end of the battery pack module.

8. The charging control circuit of the electrical control box that can automatically disconnect the charging circuit according to claim 7, characterized in that: The negative terminal of diode D2 is connected to one connection terminal of circuit breaker QF1 and the BMS power supply terminal. The BMS power supply terminal is also connected to the other end of the vehicle circuit breaker. The positive terminal of diode D3 is connected to the positive terminal of emergency charging.

9. A charging control circuit for an electrical control box that can automatically disconnect the charging circuit according to claim 8, characterized in that: The negative charging module includes a current transformer TA and a fuse FU2. One side of the negative charging module is provided with a 110V- terminal and an emergency charging negative terminal. One end of the current transformer TA is connected to the 110V- terminal and the emergency charging negative terminal, and the other end of the current transformer TA is connected to one end of the fuse FU2. One end of the fuse FU2 is connected to one end of the battery pack module.

10. A charging control circuit for an electrical control box that can automatically disconnect the charging circuit according to claim 9, characterized in that: The battery charging unit BCU is provided with a +15V input terminal, a -15V output terminal, and an M terminal. The control connection terminal of the current transformer TA is connected to the +15V input terminal, the -15V output terminal, and the M terminal of the battery charging unit BCU.

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