Electric swap station and automatic power-off device of rechargeable battery of electric swap station

Abstract

The utility model provides a charging station and an automatic power-off device of a rechargeable battery of the charging station, and the device comprises a charging pile side gun head auxiliary power supply, an intermediate relay, a time relay, a switching power supply, and a driving wake-up loop of the rechargeable battery, and the positive electrode of the charging pile side gun head auxiliary power supply is connected with one side of a coil of the intermediate relay. The other side of the coil of the intermediate relay is connected with the cathode of the charging pile side gun head auxiliary power supply; the other side of the normally-closed contact of the intermediate relay is connected with one side of a coil of the time relay, and the other side of the coil of the time relay is connected with the cathode of the charging pile side gun head auxiliary power supply; one side of the contact of the time relay is connected with the anode of the switching power supply, and the other side of the contact of the time relay is connected with the driving awakening loop of the rechargeable battery. Therefore, through linkage between the intermediate relay and the time relay, automatic power-off of the driving awakening loop when the rechargeable battery is abnormal is achieved, safety is achieved, time and labor are saved, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging and swapping power, and particularly relates to an automatic power-off device for a charging battery and a swapping power station. Background Art

[0002] At present, when a charging pile charges a battery, if the charging is abnormal, such as when the charging battery, such as a lithium iron phosphate battery, reports warnings such as single-cell overcharging and battery overheating inside, the charging battery BMS (Battery Management and Protection System) will actively disconnect the communication handshake with the charging pile, resulting in the termination of charging. If the back-end staff tries to restart the charging at the platform end, it will not be possible to start because the single loop for waking up the battery during driving is powered by the 24V voltage on the bracket in real time, but there is no interaction (voltage, current, message, etc.) between the BMS and the charging pile. According to the requirements of the BMS, the waking-up loop for the battery during driving also needs to be put into sleep mode to start charging. For this reason, the duty personnel need to manually operate the battery pack to temporarily cut off the power of the waking-up loop for the battery during driving by physically disconnecting the charging wake-up loop of the battery and the corresponding socket on the bracket end (that is, it is necessary to manually hoist the battery pack to physically separate it from the bracket to disconnect the battery for a period of time), so as to be able to restart the charging pile to charge the battery at the back end again. However, hoisting the battery is neither safe nor time-consuming and laborious, and the user experience is poor. Content of the Utility Model

[0003] To solve one of the above technical problems, the utility model proposes the following technical solutions.

[0004] In a first aspect of an embodiment of the utility model, an automatic power-off device for a charging battery is proposed. The charging battery is physically connected to the bracket through the wake-up loop for driving on it. The device includes an auxiliary power supply for the gun head on the charging pile side, an intermediate relay, a time relay, a switching power supply, and the wake-up loop for driving the charging battery. The positive pole of the auxiliary power supply for the gun head on the charging pile side is connected to one side of the coil of the intermediate relay, and the other side of the coil of the intermediate relay is connected to the negative pole of the auxiliary power supply for the gun head on the charging pile side; one side of the normally closed contact of the intermediate relay is connected to the positive pole of the switching power supply, the other side of the normally closed contact of the intermediate relay is connected to one side of the coil of the time relay, and the other side of the coil of the time relay is connected to the negative pole of the auxiliary power supply for the gun head on the charging pile side; one side of the contact of the time relay is connected to the positive pole of the switching power supply, and the other side of the contact of the time relay is connected to the wake-up loop for driving the charging battery.

[0005] In addition, the automatic power-off device for a charging battery according to the above embodiment of the utility model may further have the following additional technical features.

[0006] In some examples, the switching power supply includes a first switching power supply and a second switching power supply with different output voltages. One side of the normally closed contact of the intermediate relay is connected to the positive pole of the first switching power supply, and one side of the contact of the time relay is connected to the positive pole of the second switching power supply.

[0007] In some examples, the output voltage of the first switching power supply is 12V or 24V, and the output voltage of the second switching power supply is 24V.

[0008] In some examples, the time relay is of the type with delayed power-on or delayed power-off. Among them, the contact of the time relay with delayed power-on is a normally open contact, and the contact of the time relay with delayed power-off is a normally closed contact.

[0009] A first aspect embodiment of the present invention proposes a battery swapping station that applies the automatic power-off device for the charging battery described above.

[0010] The technical solution of the embodiment of the present invention realizes the automatic power-off of the driving wake-up circuit when the charging battery is abnormal through the linkage between the intermediate relay and the time relay, which is both safe and time-saving and labor-saving, and improves the user experience. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the automatic power-off device for the charging battery according to an embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of the contacts of each relay when the automatic power-off device for the charging battery according to an embodiment of the present invention has a charging abnormality. Detailed Embodiments

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0014] It should be noted that when the rechargeable battery is being charged, the rechargeable battery is physically connected to the bracket where it is located through its vehicle wake-up circuit. The vehicle wake-up circuit refers to that when the battery is placed in a heavy truck, when the vehicle starts running, voltage will be supplied to this circuit. After the vehicle wake-up circuit is powered on, the vehicle CANH / L on the output side of the BMS will output a message (this message includes the ID of the battery, battery pack parameters, etc.). However, when charging the battery, it is not in the driving state, and this circuit needs to be powered separately to ensure that the vehicle CANH / L of the battery BMS can output messages at all times, so as to ensure that various data of the battery pack can be read in real time by the background when the battery is stationary on the bracket where it is located. That is, the vehicle wake-up circuit is a circuit for physical connection with the bracket where it is located. Usually, this circuit is plugged and connected to the bracket when charging.

[0015] When the rechargeable battery is abnormal and the BMS disconnects the communication handshake with the charging pile, charging is terminated. At this time, if the charging pile is directly restarted or started again, charging will fail (that is, no electricity can be charged), because the vehicle wake-up circuit on the battery pack is powered separately, and there is no interaction (voltage, current, message, etc.) between the BMS and the charging pile. According to the requirements of the BMS, the vehicle wake-up circuit of the battery needs to be put into sleep mode (that is, the vehicle wake-up circuit is powered off briefly). Therefore, when the rechargeable battery is abnormal, in order to power off the vehicle wake-up circuit briefly, usually the duty personnel physically separates the vehicle wake-up circuit from the bracket to achieve the physical disconnection of the battery wake-up circuit, which is neither safe nor time-consuming and laborious, and the user experience is poor.

[0016] Therefore, the embodiment of the present utility model provides an automatic power-off device for a rechargeable battery, which can automatically disconnect the vehicle wake-up circuit of the battery without physically separating the battery from the bracket where it is located.

[0017] The rechargeable battery can be a lithium iron phosphate battery.

[0018] Figure 1 It is a schematic structural diagram of an automatic power-off device for a rechargeable battery according to an embodiment of the present utility model.

[0019] As Figure 1 shown, the automatic power-off device for the rechargeable battery includes a charging pile side gun head auxiliary power supply 1, an intermediate relay KM, a time relay TM and a switching power supply 2, and a vehicle wake-up circuit 3 of the rechargeable battery.

[0020] The positive pole A+ of the charging pile side gun head auxiliary power supply 1 is connected to one side A1 of the coil of the intermediate relay, and the other side A2 of the coil of the intermediate relay is connected to the negative pole GND of the charging pile side gun head auxiliary power supply 1. This forms a complete circuit.

[0021] One side A3 of the normally-closed contact of the intermediate relay KM is connected to the positive pole of the switching power supply, and the other side A4 of the normally-closed contact of the intermediate relay KM is connected to one side B1 of the coil of the time relay TM. The other side B2 of the coil of the time relay TM is connected to the negative pole GND of the auxiliary power supply 1 of the charging gun on the charging pile side. This forms a complete circuit.

[0022] One side B3 of the contact of the time relay TM is connected to the positive pole + of the switching power supply 2, and the other side B4 of the contact of the time relay TM is connected to the driving wake-up circuit 3 of the charging battery. This forms a complete circuit.

[0023] Among them, the time relay TM is set to be of the type with delayed power-on or power-off delay. Among them, the contact of the time relay with delayed power-on is a normally-open contact, and the contact of the time relay with power-off delay is a normally-closed contact. Its delay time can be about 60S.

[0024] Specifically, through the linkage among the auxiliary power supply 1 of the gun head, the intermediate relay KM, and the time relay TM, the restart protection after abnormal charging stop of the battery is realized. The following takes the time relay with delayed power-on as an example for illustration.

[0025] Refer to Figure 1 , when the charging pile charges the charging battery and the battery is normal, that is, when the charging voltage is normal, the auxiliary power supply 1 of the charging gun on the charging pile side supplies power normally and is in the power supply state. The coil of the intermediate relay KM is energized and its normally-closed contact is disconnected. Furthermore, the coil of the time relay (with delayed power-on) TM is de-energized and its normally-open contact is in the disconnected state. That is, during normal charging, the driving wake-up circuit is in the power-off state.

[0026] Refer to Figure 2 , when the charging pile charges the charging battery and the battery is abnormal due to various reasons (such as single-cell overcharge, battery overheating, etc.), that is, when the charging voltage is disconnected, the auxiliary power supply 1 of the charging gun on the charging pile side disconnects the voltage and stops power supply. The coil of the intermediate relay KM is de-energized and its normally-closed contact is closed. Furthermore, the coil of the time relay TM (with delayed power-on) is energized after a delay of 60S and its normally-open contact is closed. In this way, after a certain delay through the time power-on delay relay, the driving wake-up circuit of the charging battery is closed. At this time, when the battery pack is in a stationary state, the driving wake-up circuit is powered, and the BMS outputs various battery pack messages to the background through the vehicle CANH / L.

[0027] When restarting the charging pile to charge the battery, the charging voltage is normal, and the normally-closed contact of the intermediate relay KM returns to the disconnected state. Furthermore, the normally-open contact of the time relay TM (with delayed power-on) returns to the disconnected state.

[0028] Compared with the related art, when the battery is abnormal, in order to restart charging, it is not necessary to physically disconnect the vehicle wake-up circuit of the battery from the corresponding bracket. Instead, the vehicle wake-up circuit is automatically closed after a period of time, such as 60S. During this period, the power supply of the vehicle wake-up circuit on the battery is cut off, which is both safe and time-saving and labor-saving, meeting the requirements of unattended charging.

[0029] Therefore, the automatic power-off device of the rechargeable battery in the embodiment of the present invention realizes the automatic power-off of the vehicle wake-up circuit when the rechargeable battery is abnormal through the linkage between the intermediate relay and the time relay, thereby realizing the automatic disconnection of the rechargeable battery, which is both safe and time-saving and labor-saving, and improves the user experience.

[0030] In an example of the present invention, referring to Figure 1 and 2 , the switching power supply 2 includes a first switching power supply 21 and a second switching power supply 22 with different output voltages. One side A3 of the normally closed contact of the intermediate relay KM is connected to the positive pole of the first switching power supply 21, and one side B3 of the contact of the time relay is connected to the positive pole of the second switching power supply 22.

[0031] Among them, the output voltage of the first switching power supply is 12V or 24V, and the output voltage of the second switching power supply is 24V.

[0032] Specifically, when the charging of the heavy truck battery by the charging pile suddenly stops due to various abnormal reasons during charging, and the charging pile disconnects the charging voltage, the positive and negative poles of the auxiliary power supply 1 of the charging pile gun head stop supplying power and disconnect the supply voltage. The coil of the intermediate relay KM is disconnected, so its normally closed contact closes. Then, the coil of the time-delay energization type time relay TM is attracted, and its normally open contact closes after a delay of 60S. At this time, because the charging pile has stopped charging and the charging pile auxiliary power supply has disconnected all additional power supply interactions with the heavy truck battery BMS, etc., the 60S delay of the normally open contact of the time relay TM not only realizes the disconnection of the vehicle wake-up circuit on the heavy truck battery, but also saves the operation steps of the staff needing to hoist the battery to physically disconnect the vehicle wake-up circuit from the bracket.

[0033] During the next charging, the normally closed contact of the intermediate relay KM returns to the open state, and then the normally open contact of the time-delay energization type time relay TM returns to the open state. Since the vehicle wake-up circuit of the battery is temporarily powered off, effective charging of the battery can be realized, that is, the battery can be charged.

[0034] In summary, for the automatic power-off device of the rechargeable battery in the embodiment of the present utility model, after the battery charging abnormally stops, it is not necessary to hoist the battery to disconnect the vehicle wake-up circuit on the battery. Even if the power is off for a period of time, the vehicle wake-up circuit of the rechargeable battery can be automatically disconnected, and further, the background can restart the battery for effective charging again. It is both safe and time-saving and labor-saving, with a simple and practical design, low cost, and good user experience.

[0035] The automatic power-off device of the rechargeable battery of the present utility model can be applied to a new energy heavy truck swapping station. Therefore, the embodiment of the present utility model also proposes a swapping station that applies the automatic power-off device of the rechargeable battery proposed in the above embodiment.

[0036] The intermediate relay KM, the time relay TM, and the switching power supply 2 are arranged in the swapping station. During the charging process of the rechargeable battery in the swapping station, when the charging voltage is abnormal, the automatic power-off device of the rechargeable battery is used to automatically cut off the vehicle wake-up circuit of the rechargeable battery.

[0037] Thus, the swapping station uses the automatic power-off device of the rechargeable battery to automatically cut off the vehicle wake-up circuit when the rechargeable battery is abnormal through the linkage between the intermediate relay and the time relay, which is both safe and time-saving and labor-saving, and improves the user experience.

[0038] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An automatic power-off device for a rechargeable battery, wherein the rechargeable battery is physically connected to a bracket via a driving wake-up circuit thereon, characterized in that: It includes an auxiliary power supply (1) for the charging pile side gun head, an intermediate relay (KM), a time relay (TM) and a switch power supply (2), and a driving wake-up circuit (3) for the charging battery. The positive pole of the auxiliary power supply (1) of the charging pile gun head is connected to one side (A1) of the coil of the intermediate relay, and the other side (A2) of the coil of the intermediate relay is connected to the negative pole of the auxiliary power supply (1) of the charging pile gun head; One side (A3) of the normally closed contact of the intermediate relay is connected to the positive electrode of the switch power supply (2), the other side (A4) of the normally closed contact of the intermediate relay is connected to one side (B1) of the coil of the time relay, and the other side (B2) of the coil of the time relay is connected to the negative electrode of the auxiliary power supply (1) of the charging pile side gun head; One side (B3) of the contact of the time relay is connected to the positive pole of the switching power supply, and the other side (B4) of the contact of the time relay is connected to the driving wake-up circuit (3) of the rechargeable battery.

2. The automatic power-off device for a rechargeable battery according to claim 1, characterized in that: The switching power supply (2) comprises a first switching power supply (21) and a second switching power supply (22) having different output voltages, a normally closed contact side (A3) of the intermediate relay (KM) is connected to the positive electrode of the first switching power supply (21), and a contact side (B3) of the time relay (TM) is connected to the positive electrode of the second switching power supply (22).

3. The automatic power-off device for a rechargeable battery according to claim 2, characterized in that: The output voltage of the first switching power supply is 12V or 24V, and the output voltage of the second switching power supply is 24V.

4. The automatic power-off device for a rechargeable battery according to claim 1, characterized in that: The time relay is of a delayed power-on type or a power-off delay type, wherein the contact of the delayed power-on type time relay is a normally open contact, and the contact of the power-off delay type time relay is a normally closed contact.

5. A battery swap station, characterized in that: An automatic power-off device for a rechargeable battery according to any one of claims 1 to 4 is used.

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