Battery charging and discharging circuit

Abstract

The utility model discloses a battery charging and discharging circuit, which comprises a main positive relay (1), a main negative relay (2), a pre-charging circuit (3) and a host module (4), one end of the main positive relay (1) is used for connecting a positive electrode of a battery, one end of the main negative relay (2) is used for connecting a negative electrode of the battery, and the other end of the main positive relay (1) is connected with a discharging positive electrode and a charging positive electrode. The other end of the main negative relay (2) is connected with a discharging cathode and a charging cathode; the pre-charging circuit (3) comprises a pre-charging relay (6) and a pre-charging resistor (7) which are connected in series, and the pre-charging relay (6) and the pre-charging resistor (7) are connected in parallel with the main positive relay (1) through lines; according to the utility model, a plurality of parameters of the battery can be detected, the circuit can be quickly cut off, the use safety is good, the pre-charging circuit can limit the voltage during charging and discharging so as to protect components, and the use reliability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, and particularly relates to a battery charging and discharging circuit. Background Art

[0002] With the continuous development of technology, battery and electronic control technologies are constantly updated and iterated. More and more vehicles are driven by new energy. Among them, using new energy to drive buses can effectively save usage costs and significantly reduce environmental pollution. However, due to their large volume, buses are rather troublesome when entering fixed charging positions for charging and a large number of charging positions need to be set to meet the charging requirements. Therefore, many portable charging systems have emerged on the market. Since the portable charging system uses independent batteries and circuits for power supply instead of power cords, parameters such as temperature and voltage during operation will affect the operation of the battery and the circuit. Therefore, the normal use and safety of the battery and the circuit are particularly important. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a battery charging and discharging circuit. The utility model can detect multiple parameters of the battery and quickly cut off the circuit, with good use safety, and the pre-charge circuit can limit the voltage magnitude during charging and discharging to protect components, with good use reliability.

[0004] The technical solution of the utility model: A battery charging and discharging circuit includes a main positive relay, a main negative relay, a pre-charge circuit, and a host module. One end of the main positive relay is used to connect to the positive electrode of the battery, and one end of the main negative relay is used to connect to the negative electrode of the battery. The other end of the main positive relay is connected to a discharge positive electrode and a charging positive electrode, and the other end of the main negative relay is connected to a discharge negative electrode and a charging negative electrode; the pre-charge circuit includes a pre-charge relay and a pre-charge resistor connected in series, and the pre-charge relay and the pre-charge resistor are connected in parallel with the main positive relay through a circuit; the host module has a temperature and voltage acquisition interface for connecting to the battery; the host module has a relay control interface for connecting the main positive relay, the main negative relay, and the pre-charge relay.

[0005] In the above-mentioned battery charging and discharging circuit, it further includes an isolation module. The input end of the isolation module is connected to the battery for power supply, and the output end of the isolation module is connected to the power input end of the host module.

[0006] In the aforementioned battery charging and discharging circuit, the input end of the isolation module is connected to the two poles of the battery through a switch.

[0007] In the aforementioned battery charging and discharging circuit, the main positive relay is connected to the positive electrode of the battery through a fuse.

[0008] In the aforementioned battery charging and discharging circuit, the host module has a communication interface.

[0009] In the aforementioned battery charging and discharging circuit, a shunt is connected to the power output terminal of the host module, and the main negative relay is connected to the negative electrode of the battery via the shunt.

[0010] Compared with the prior art, the utility model includes a main positive relay, a main negative relay, a pre-charging circuit, and a host module. One end of the main positive relay is used to connect to the positive electrode of the battery, and one end of the main negative relay is used to connect to the negative electrode of the battery. The other end of the main positive relay is connected to a discharge positive electrode and a charging positive electrode, and the other end of the main negative relay is connected to a discharge negative electrode and a charging negative electrode. The pre-charging circuit includes a pre-charging relay and a pre-charging resistor connected in series, and the pre-charging relay and the pre-charging resistor are connected in parallel with the main positive relay via a circuit. The host module has a temperature and voltage acquisition interface for connecting to the battery. The host module has a relay control interface for connecting the main positive relay, the main negative relay, and the pre-charging relay. When in use, the charging and discharging of the battery are realized by controlling the opening and closing of the main positive relay and the main negative relay by the host module. Before closing the main positive relay and the main negative relay, the external capacitive load voltage can be slowly increased by closing the pre-charging relay, and then the main positive relay and the main negative relay are closed for charging and discharging, effectively preventing components from being damaged due to sudden voltage changes, and having good use reliability. The host module obtains the voltage and temperature of the battery through the temperature and voltage acquisition interface, and can then quickly disconnect the main positive relay and the main negative relay to cut off the circuit when the voltage and temperature exceed the threshold, interrupting the charging and discharging process to ensure the safety of use. Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the utility model.

[0012] The reference signs in the drawings are: 1 - main positive relay; 2 - main negative relay; 3 - pre-charging circuit; 4 - host module; 5 - relay control interface; 6 - pre-charging relay; 7 - pre-charging resistor; 8 - temperature and voltage acquisition interface; 10 - isolation module; 11 - communication interface; 12 - shunt; 13 - key; 14 - fuse; 15 - battery. Detailed Embodiments

[0013] The following further illustrates the utility model in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the utility model.

[0014] Embodiment: A battery charging and discharging circuit, as shown in the attached Figure 1As shown in the figure, it includes a main positive relay 1, a main negative relay 2, a pre-charge circuit 3 and a host module 4. One end of the main positive relay 1 is connected to the positive electrode (BAT+) of the battery 15, and one end of the main negative relay 2 is connected to the negative electrode (BAT-) of the battery 15. The other end of the main positive relay 1 is connected to the discharge positive electrode and the charge positive electrode, and the other end of the main negative relay 2 is connected to the discharge negative electrode and the charge negative electrode. The discharge positive electrode and the discharge negative electrode are connected to the battery to be charged to form a discharge circuit to realize discharge, and the charge positive electrode and the charge negative electrode are connected to the power supply to form a charge circuit to realize charging. The pre-charge circuit 3 includes a pre-charge relay 6 and a pre-charge resistor 7 connected in series. The pre-charge relay 6 and the pre-charge resistor 7 are connected in parallel with the main positive relay 1 through a circuit. The host module 4 has a temperature and voltage acquisition interface 8 for connecting to the battery, and the temperature and voltage acquisition interface 8 is used for acquiring the battery temperature and voltage. The host module 4 has a relay control interface 5 connected to the main positive relay 1, the main negative relay 2 and the pre-charge relay 6. The relay control interface is connected to the main positive relay 1, the main negative relay 2 and the pre-charge relay 6 through a circuit to control their opening and closing. At the same time, the relay control interface is also used for detecting the voltages of the main positive relay and the main negative relay, so as to detect abnormal working states and cut off in time. It also includes an isolation module 10. The input end of the isolation module 10 is connected to the battery for power supply, and the output end of the isolation module 10 is connected to the power input end of the host module 4. The isolation module changes the high voltage of the battery to 24V to supply power to the host module. The input end of the isolation module 10 is connected to the two poles of the battery through a switch 13, and the on-off of the host module can be manually controlled through the switch. The main positive relay 1 is connected to the positive electrode of the battery through a fuse 14. When the current in the circuit is too large, the fuse can be melted to achieve a protection effect, further improving the safety of use. The host module 4 has a communication interface 11, which is connected to an external control terminal through a mobile network and a wired network, and the charge and discharge of the circuit can be quickly controlled through the control terminal. A 200A 75mv shunt 12 is connected to the power output end of the host module 4, and the main negative relay 2 is connected to the negative electrode of the battery through the shunt 12. The shunt can detect the magnitude of the current in the circuit to expand the parameter detection range.

[0015] Working principle: During use, the charge and discharge of the battery 15 are realized by controlling the opening and closing of the main positive relay 1 and the main negative relay 2 through the host module 4. Before closing the main positive relay 1 and the main negative relay 2, by closing the pre-charge relay 6, the voltage of the external capacitive load can rise slowly, and then the main positive relay 1 and the main negative relay 2 are closed for charge and discharge, effectively preventing components from being damaged due to sudden voltage changes, and having good use reliability. The host module 4 obtains the voltage and temperature of the battery 15 through the temperature and voltage acquisition interface 8, and then can quickly disconnect the main positive relay 1 and the main negative relay 2 when the voltage and temperature exceed the threshold value to cut off the circuit and interrupt the charge and discharge process to ensure the safety of use.

[0016] The above embodiments only illustrate the implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. In these embodiments, up, down, left, right, front, and back only represent their relative positions rather than their absolute positions. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A battery charging and discharging circuit, characterized in that: The invention comprises a main positive relay (1), a main negative relay (2), a pre-charging circuit (3) and a host module (4); one end of the main positive relay (1) is used to connect to the positive electrode of the battery; one end of the main negative relay (2) is used to connect to the negative electrode of the battery; the other end of the main positive relay (1) is connected to the positive electrode for discharge and the positive electrode for charge; the other end of the main negative relay (2) is connected to the negative electrode for discharge and the negative electrode for charge; the pre-charging circuit (3) comprises a pre-charging relay (6) and a pre-charging resistor (7) connected in series; the pre-charging relay (6) and the pre-charging resistor (7) are connected in series through a line The host module (4) is connected in parallel with the main positive relay (1); the host module (4) is provided with a temperature and pressure acquisition interface (8) for connecting to a battery; the host module (4) is provided with a relay control interface (5) connected to the main positive relay (1), the main negative relay (2) and the pre-charge relay (6); and further comprises an isolation module (10), the input end of the isolation module (10) being connected to the battery for power supply, the output end of the isolation module (10) being connected to the power input end of the host module (4), and the isolation module converting the high voltage of the battery into 24V to power the host module.

2. The battery charging and discharging circuit according to claim 1, characterized in that: The input end of the isolation module (10) is connected to the two poles of the battery via an electric key (13).

3. The battery charging and discharging circuit according to claim 1, characterized in that: The main positive relay (1) is connected to the positive electrode of the battery via a fuse.

4. The battery charging and discharging circuit according to claim 1, characterized in that: The host module (4) is provided with a communication interface (11).

5. The battery charging and discharging circuit according to claim 1, characterized in that: A shunt (12) is connected to the power output end of the host module (4), and the main negative relay (2) is connected to the negative electrode of the battery via the shunt (12).

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