High-voltage box circuit supporting multi-channel charging current acquisition, and high-voltage box electrical system

Abstract

Disclosed in the present application are a high-voltage box circuit supporting multi-channel charging current acquisition, and a high-voltage box electrical system. The high-voltage box circuit supporting multi-channel charging current acquisition may comprise at least two charging branches, a main relay and a pre-charging loop, wherein each charging branch comprises a positive charging branch and a negative charging branch; each positive charging branch comprises a fuse, a current sensor and a first relay which are arranged in series; each negative charging branch comprises a second relay; and the main relay and the pre-charging loop are arranged in parallel.

Description

High-voltage box circuit and high-voltage box electrical system supporting multi-channel charging current collection

[0001] The present application claims priority to the Chinese patent application No. 202422412457.5 filed on September 30, 2024 with the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of high-voltage boxes, in particular to a high-voltage box circuit and a high-voltage box electrical system supporting multi-channel charging current collection. BACKGROUND

[0003] With the progress and development of science and technology, large-scale electrified products such as electric vehicles are gradually popularized in people's production and life. High-voltage box products have the functions of protecting circuit safety and realizing power distribution, and have become the focus of people's research. TECHNICAL PROBLEM

[0004] At present, most high-voltage box products are dual-channel charging, and the current monitoring loop of the high-voltage box is placed on the battery main loop. When the system is charging, the charging current will be collected on the main loop, which causes the current collection device on the main loop to be unable to effectively distinguish whether the current on the charging branch is balanced. At present, most high-voltage boxes only place a fuse at the battery box loop end. Although the fuse in series at the single battery end loop can quickly cut off the loop and ensure electrical safety when the battery end is short-circuited, if the short circuit is only in the charging loop inside the high-voltage box, the fuse at the battery end will not respond to the short-circuit state, and the short-circuit current will not be cut off. Therefore, it is particularly important to propose a high-voltage box circuit that can monitor the branch current and improve the safety of the circuit. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a high-voltage box circuit supporting multi-channel charging current collection, the circuit comprising at least two charging branches, a main relay and a pre-charge loop, wherein:

[0006] Each of the charging branches comprises a charging positive branch and a charging negative branch, the charging positive branch comprising a fuse, a current sensor and a first relay arranged in series, and the charging negative branch comprising a second relay, and the main relay is arranged in parallel with the pre-charge loop.

[0007] In a second aspect, the present application provides a high-voltage box electrical system, comprising the high-voltage box circuit supporting multi-channel charging current collection as disclosed in the first aspect of the present application. ADVANTAGEOUS EFFECTS

[0008] In the present application, a fuse and a current sensor can be arranged on each charging branch of the high-voltage box circuit. As can be seen, the present application can fuse the charging branch through the fuse to ensure that the system can timely fuse the circuit when the charging branch is short-circuited, ensure electrical safety, collect the current data of the charging branch through the current sensor, ensure the balanced distribution of the current of each branch, solve the balanced charging detection condition of the branch, and improve the overall safety and stability of the high-voltage box circuit. BRIEF DESCRIPTION OF DRAWINGS

[0009] FIG. 1 is a structural schematic diagram of a high-voltage box circuit supporting multi-path charging current collection according to an embodiment of the present application;

[0010] FIG. 2 is a structural schematic diagram of a high-voltage box electrical system according to an embodiment of the present application.

[0011] Embodiments of the present application

[0012] The present application discloses a high-voltage box circuit and a high-voltage box electrical system supporting multi-path charging current collection. The present application can fuse the charging branch through the fuse to ensure that the system can timely fuse the circuit when the charging branch is short-circuited, ensure electrical safety, collect the current data of the charging branch through the current sensor, ensure the balanced distribution of the current of each branch, solve the balanced charging detection condition of the branch, and improve the overall safety and stability of the high-voltage box circuit. The following will be described in detail.

[0013] Embodiment one

[0014] Please refer to FIG. 1, which is a structural schematic diagram of a high-voltage box circuit supporting multi-path charging current collection according to an embodiment of the present application. The high-voltage box circuit supporting multi-path charging current collection shown in FIG. 1 can be applied to a high-voltage box electrical system, which is not limited by the present application. As shown in FIG. 1, the high-voltage box circuit supporting multi-path charging current collection can include at least two charging branches, a main relay, and a pre-charge circuit, wherein:

[0015] Each charging branch includes a charging positive branch and a charging negative branch. The charging positive branch includes a fuse, a current sensor, and a first relay arranged in series, and the charging negative branch includes a second relay. The main relay is arranged in parallel with the pre-charge circuit.

[0016] Optionally, the high-voltage box circuit supporting multi-channel charging current collection can include at least two charging branches, each charging branch including a charging positive branch and a charging negative branch, for example, the first charging positive branch and the first charging negative branch in FIG. 1 form the first charging branch, the second charging positive branch and the second charging negative branch form the second charging branch, the third charging positive branch and the third charging negative branch form the third charging branch, and the Nth charging positive branch and the Nth charging negative branch form the Nth charging branch.

[0017] Optionally, each charging positive branch includes a fuse, a current sensor, and a first relay arranged in series, wherein the fuse can be used for fuse protection of the charging branch to ensure that the system can timely fuse the circuit when a short circuit occurs in the charging branch, ensuring electrical safety; the current sensor can be used to collect current data of the charging branch, and optionally, the collected current data can be transmitted to the BMS device for real-time monitoring of the charging current of each branch by the BMS device to ensure balanced distribution of current in each branch and solve the problem of balanced charging detection of branches.

[0018] Optionally, the main relay is arranged in parallel with the pre-charge circuit, and the main negative pre-charge is adopted to reduce the use of the main positive relay, thereby reducing the cost and weight.

[0019] Optionally, the high-voltage box circuit supporting multi-channel charging current collection can further include at least one discharging branch, for example, the first discharging positive branch and the first discharging negative branch in FIG. 1 form the first discharging branch, and the Mth discharging positive branch and the Mth discharging negative branch form the Mth discharging branch.

[0020] As can be seen, the high-voltage box circuit supporting multi-channel charging current collection described in FIG. 1 can set a fuse and a current sensor on each charging branch of the high-voltage box circuit, the fuse is used for fuse protection of the charging branch to ensure that the system can timely fuse the circuit when a short circuit occurs in the charging branch, ensuring electrical safety, and the current sensor is used to collect current data of the charging branch to ensure balanced distribution of current in each branch, solve the problem of balanced charging detection of branches, and improve the overall safety and stability of the high-voltage box circuit.

[0021] In an optional embodiment, the pre-charge circuit includes a pre-charge relay and a pre-charge resistor arranged in series.

[0022] Optionally, the pre-charge circuit includes a pre-charge relay and a pre-charge resistor arranged in series, the pre-charge circuit can be used to balance the voltage between the battery system and the external power supply or load when the high-voltage box circuit is charging, and protect the internal components, the main relay is arranged in parallel with the pre-charge circuit, the main negative pre-charge is adopted to reduce the use of the main positive relay, thereby reducing the cost and weight.

[0023] It can be seen that the optional embodiment can balance the voltage between the battery system and the external power supply or load when the high-voltage box circuit is charged through the pre-charge relay and the pre-charge resistor of the pre-charge circuit, protect the internal components, improve the safety and stability of the high-voltage box circuit, and use the main negative pre-charge to reduce the use of the main positive relay, reduce the cost and weight.

[0024] In another optional embodiment, the high-voltage box circuit supporting multi-channel charging current collection can further include a number of manual maintenance switches corresponding to the number of charging branches, wherein:

[0025] One end of each charging positive branch is electrically connected to the first end of each manual maintenance switch, and the second end of each manual maintenance switch is electrically connected to the corresponding battery total positive.

[0026] Optionally, the high-voltage box circuit supporting multi-channel charging current collection can further include a number of manual maintenance switches corresponding to the number of charging branches, for example, as shown in FIG. 1, the number of manual maintenance switches is the same as the number of charging branches, and the number of battery total positives and battery total negatives, one end of each charging positive branch is electrically connected to the first end of each manual maintenance switch, that is, one end of the fuse of each charging positive branch is electrically connected to the first end of the first manual maintenance switch, the second manual maintenance switch, the third manual maintenance switch, and the Nth manual maintenance switch; the second end of each manual maintenance switch is electrically connected to the corresponding battery total positive, that is, the second end of the first manual maintenance switch is electrically connected to the first battery total positive, the second end of the second manual maintenance switch is electrically connected to the second battery total positive, the second end of the third manual maintenance switch is electrically connected to the third battery total positive, and the second end of the Nth manual maintenance switch is electrically connected to the Nth battery total positive.

[0027] It can be seen that the optional embodiment can realize electrical isolation, short-circuit protection of the high-voltage box circuit, and monitoring the state of the high-voltage system based on the manual maintenance switch, realize high-voltage interlocking and other functions, and improve the safety and stability of the high-voltage box circuit.

[0028] In yet another optional embodiment, the high-voltage box circuit supporting multi-channel charging current collection can further include a manual repair master control, wherein:

[0029] The manual repair master control and the third end of each manual maintenance switch are connected in series to form a high-voltage interlocking loop.

[0030] Optionally, the manual repair master control and the third end of each manual repair switch form a high-voltage interlock loop in series, as shown in FIG. 1, the first manual repair switch inputs the high-voltage interlock output to the manual repair master control, specifically, the manual repair switch (MSD) sends a low-voltage electrical signal to the vehicle controller or other related systems when detecting an abnormality in the high-voltage system, which is used to cut off the high-voltage power supply and trigger an alarm; the Nth manual repair switch receives the high-voltage interlock output input by the manual repair master control, specifically, the manual repair switch (MSD) receives a low-voltage electrical signal from each component of the high-voltage system, which is used to monitor the integrity of the high-voltage system, and when the MSD detects that a component in the high-voltage system is disconnected or abnormal, a protection mechanism is triggered.

[0031] As can be seen, the optional embodiment can monitor the state of the high-voltage system based on the manual repair master control and the manual repair switch, realize high-voltage interlocking and other functions, and improve the safety and stability of the high-voltage box circuit.

[0032] In yet another optional embodiment, the high-voltage box circuit supporting multi-channel charging current acquisition can further include CAN current sensors corresponding to the number of charging branches, wherein:

[0033] One end of each charging negative branch is electrically connected to one end of each CAN current sensor, and the other end of each CAN current sensor is electrically connected to the corresponding battery total negative.

[0034] Optionally, one end of each charging negative branch is electrically connected to one end of each CAN current sensor, i.e. one end of each second relay is electrically connected to one end of each CAN current sensor, and the other end of each CAN current sensor is electrically connected to the corresponding battery total negative. The CAN current sensor can be used to detect current, generate message data, and then transmit the message data to the BMS through the CAN bus.

[0035] As can be seen, the optional embodiment can collect the current Hall signal of the high-voltage box circuit based on the CAN current sensor and convert it into message data, which is transmitted to the BMS through the CAN bus, which can improve the accuracy of current data acquisition and data transmission speed, improve the efficiency of current analysis of the high-voltage box circuit, and thus improve the safety of the high-voltage box circuit.

[0036] In yet another optional embodiment, the high-voltage box circuit supporting multi-channel charging current acquisition can further include a thermal management system, wherein:

[0037] The thermal management system includes a thermal management system fuse and a thermal management system relay arranged in series.

[0038] Optionally, the thermal management system comprises a thermal management system fuse and a thermal management system relay arranged in series, wherein the thermal management system fuse can realize overload protection and short circuit protection of the system, and the thermal management system relay can increase the number and capacity of system contacts, convert voltage and current, realize remote control, and the like.

[0039] It can be seen that the optional embodiment can realize overload protection and short circuit protection of the system based on the thermal management system fuse and the thermal management system relay of the thermal management system, realize remote control, improve the safety and stability of the high-voltage box circuit, and improve the control efficiency of the thermal management system.

[0040] In yet another optional embodiment, the high-voltage box circuit supporting multi-path charging current collection can further comprise a water bath heating system, wherein:

[0041] The water bath heating system comprises a water bath heating fuse and a water bath heating relay arranged in series.

[0042] Optionally, the water bath heating system comprises a water bath heating fuse and a water bath heating relay arranged in series, the water bath heating fuse can realize short circuit and overload protection, and simplify the maintenance process, and the water bath heating relay can realize control of the heating element and protection of the heating element.

[0043] It can be seen that the optional embodiment can realize short circuit and overload protection based on the water bath heating fuse and the water bath heating relay of the water bath heating system, simplify the maintenance process, realize control of the heating element and protection of the heating element, and improve the safety and stability of the high-voltage box circuit.

[0044] In yet another optional embodiment, each two charging branches form a super charging gun.

[0045] Optionally, the branch type of one charging branch in the super charging gun comprises a national standard terminal type, and the branch type of the other charging branch in the super charging gun comprises a super charging terminal type.

[0046] Optionally, each two charging branches form a super charging gun, wherein the branch type of one charging branch in the super charging gun comprises a national standard terminal type, for example, the first charging positive branch and the first charging negative branch in FIG. 1 are both of the national standard terminal type, and the branch type of the other charging branch in the super charging gun comprises a super charging terminal type, for example, the second charging positive branch and the second charging negative branch in FIG. 1 are both of the super charging terminal type.

[0047] It can be seen that the optional embodiment can form a super charging gun based on the national standard terminal and the super charging terminal, and set a fuse and a current sensor in each charging branch to ensure balanced distribution of current of each branch, solve the balanced charging detection condition of the branch, and improve the charging safety of the super charging gun.

[0048] Embodiment Two

[0049] Please refer to FIG. 2, which is a structural schematic diagram of a high-voltage box electrical system disclosed by embodiments of the present application. The high-voltage box electrical system shown in FIG. 2 can include a high-voltage box circuit supporting multi-path charging current collection as disclosed in Embodiment One, and the functions of the high-voltage box circuit supporting multi-path charging current collection include but are not limited to: fusing protection of the charging branch by a fuse to ensure that when a short circuit occurs in the charging branch, the system can timely fuse the circuit to ensure electrical safety, and collecting current data of the charging branch by a current sensor to ensure balanced distribution of current in each branch and solve the problem of branch balanced charging detection. It should be noted that for detailed description of the high-voltage box circuit supporting multi-path charging current collection, please refer to the specific description of the related content in Embodiment One, which will not be repeated here.

[0050] It can be seen that the high-voltage box electrical system described in FIG. 2 can set a fuse and a current sensor on each charging branch of the high-voltage box circuit, fusing protection of the charging branch by the fuse to ensure that when a short circuit occurs in the charging branch, the system can timely fuse the circuit to ensure electrical safety, and collecting current data of the charging branch by the current sensor to ensure balanced distribution of current in each branch and solve the problem of branch balanced charging detection, thereby improving the overall safety and stability of the high-voltage box electrical system.

Claims

1. A high voltage box circuit supporting multi-channel charging current collection, the circuit comprising at least two charging branches, a main relay and a pre-charge circuit, wherein: each of the charging branches comprises a charging positive branch and a charging negative branch, the charging positive branch comprising a fuse, a current sensor and a first relay arranged in series, the charging negative branch comprising a second relay, the main relay being arranged in parallel with the pre-charge circuit.

2. The high voltage tank circuit supporting multipath charging current harvesting of claim 1, wherein, the pre-charge circuit comprises a pre-charge relay and a pre-charge resistor arranged in series.

3. The high voltage tank circuit supporting multipath charging current harvesting of claim 1 or 2, wherein, the circuit further comprises a number of manual maintenance switches corresponding to the number of charging branches, wherein: one end of each of the charging positive branches is electrically connected to a first end of each of the manual maintenance switches, a second end of each of the manual maintenance switches being electrically connected to a corresponding battery total positive.

4. The high voltage tank circuit supporting multi-channel charging current harvesting of claim 3, wherein, the circuit further comprises a manual repair master, wherein: the manual repair master and a third end of each of the manual maintenance switches form a high voltage interlock loop in series.

5. The high voltage tank circuit supporting multipath charging current collection according to claim 1 or 2, wherein, the circuit further comprises a number of CAN current sensors corresponding to the number of charging branches, wherein: one end of each of the charging negative branches is electrically connected to one end of each of the CAN current sensors, another end of each of the CAN current sensors being electrically connected to a corresponding battery total negative.

6. The high voltage tank circuit supporting multipath charging current harvesting of claim 1 or 2, wherein, the circuit further comprises a thermal management system, wherein: the thermal management system comprises a thermal management system fuse and a thermal management system relay arranged in series.

7. The high voltage tank circuit supporting multipath charging current harvesting of claim 1 or 2, wherein, the circuit further comprises a water bath heating system, wherein: the water bath heating system comprises a water bath heating fuse and a water bath heating relay arranged in series.

8. The high voltage tank circuit supporting multipath charging current harvesting of claim 1 or 2, wherein, each two of the charging branches form a super-charging gun.

9. A high voltage box electrical system, the high voltage box electrical system comprising a high voltage box circuit supporting multi-channel charging current collection according to any one of claims 1-8.

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