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

Abstract

The utility model discloses a high-voltage box circuit supporting multi-path charging current acquisition and a high-voltage box electrical system, the high-voltage box circuit supporting multi-path charging current acquisition can comprise at least two charging branch circuits, a main relay and a pre-charging loop, each charging branch circuit comprises a charging positive branch circuit and a charging negative branch circuit, each charging positive branch comprises a fuse, a current sensor and a first relay which are connected in series, each charging negative branch comprises a second relay, and the main relay and the pre-charging loop are connected in parallel. Therefore, according to the utility model, fusing protection can be carried out on the charging branch circuit through the fuse, so that when the charging branch circuit is short-circuited, the system can fuse a loop in time, the electrical safety is ensured, the current data of the charging branch circuit is acquired through the current sensor, the current of each branch circuit is ensured to be distributed in a balanced manner, and the reliability of the system is improved. The problem of branch equalizing charge detection is solved, and the overall safety and stability of the high-voltage box circuit are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure box technical field especially relates to a kind of high pressure box circuit and high pressure box electrical system of support multiway charging current collection. BACKGROUND

[0002] With the progress and development of science and technology, large-scale electrification products such as electric vehicles gradually popularize in people's production and life, high-voltage box products have the functions of protecting circuit safety and realizing power distribution, and become the focus of people's research.

[0003] At present, most of the high-voltage box products are dual 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 makes the current collection device on the main loop unable to effectively distinguish whether the current on the charging branch is balanced. At present, most of the high-voltage boxes only place fuses 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 high-voltage box is only short-circuited in the charging loop, 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 provide a high-voltage box circuit capable of monitoring branch current and improving circuit safety. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a high-voltage box circuit capable of monitoring branch current and improving circuit safety.

[0005] In order to solve the above technical problems, the utility model discloses a high-voltage box circuit capable of monitoring branch current and improving circuit safety, which is characterized in that the circuit comprises at least two charging branches, a main relay and a pre-charging loop, wherein:

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

[0007] As an optional implementation, in the first aspect of the utility model, the pre-charging loop comprises a pre-charging relay and a pre-charging resistor arranged in series.

[0008] As an optional implementation, in the first aspect of the utility model, the circuit further comprises a manual maintenance switch corresponding to the number of charging branches, wherein:

[0009] One end of each of the charging positive branches is electrically connected to a first end of each of the manual maintenance switches, and a second end of each of the manual maintenance switches is connected to a corresponding total positive of the battery.

[0010] As an optional implementation, in the first aspect of the utility model, the circuit further includes a manual repair master control, wherein:

[0011] The manual repair master control and a third end of each of the manual maintenance switches form a high-voltage interlocking loop in series.

[0012] As an optional implementation, in the first aspect of the utility model, the circuit further includes CAN current sensors corresponding to the number of the charging branches, wherein:

[0013] One end of each of the charging negative branches is electrically connected to one end of each of the CAN current sensors, and the other end of each of the CAN current sensors is connected to a corresponding total negative of the battery.

[0014] As an optional implementation, in the first aspect of the utility model, the circuit further includes a thermal management system, wherein:

[0015] The thermal management system includes a thermal management system fuse and a thermal management system relay arranged in series.

[0016] As an optional implementation, in the first aspect of the utility model, the circuit further includes a water bath heating system, wherein:

[0017] The water bath heating system includes a water bath heating fuse and a water bath heating relay arranged in series.

[0018] As an optional implementation, in the first aspect of the utility model, each two of the charging branches form an overcharging gun.

[0019] The second aspect of the utility model discloses a high-voltage box electrical system, the high-voltage box electrical system includes the high-voltage box circuit of supporting the multiple charging current collection as disclosed in the first aspect of the utility model.

[0020] The utility model is implemented, and has the following beneficial effects:

[0021] In the utility model, a fuse and a current sensor can be arranged on each charging branch of the high-voltage box circuit. It can be seen that the utility model can fuse the charging branch through the fuse to ensure that the system can timely fuse the loop when the charging branch is short-circuited, guarantee electrical safety, collect the current data of the charging branch through the current sensor, ensure that the current of each branch is evenly distributed, solve the branch balanced charging detection problem, and improve the overall safety and stability of the high-voltage box circuit. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 is a structural schematic diagram of a high-voltage box circuit supporting multi-path charging current collection disclosed by the embodiments of the present application;

[0024] Figure 2 is a structural schematic diagram of a high-voltage box electrical system disclosed by the embodiments of the present application. DETAILED DESCRIPTION

[0025] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] It should be noted that, unless otherwise explicitly specified and limited, the term "electrically connected" in the specification and claims of the present application and the above drawings should be understood in a broad sense, for example, it can be fixed electrically connected, or detachable electrically connected, or integrally electrically connected; it can be mechanically electrically connected, or electrically electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. In addition, the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order, and the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The present application discloses a kind of high-voltage box circuit and high-voltage box electrical system supporting multi-path charging current collection, can be fused by fuse to this charging branch and carry out fusing protection, to ensure that when charging branch short circuit occurs, system can timely fuse loop, guarantee electrical safety, the current data of this charging branch is collected by current sensor, ensure that each branch current is evenly distributed, solve branch balanced charging detection problem, improve the overall safety and stability of high-voltage box circuit. The following are described in detail respectively.

[0028] Embodiment one

[0029] Please refer to Figure 1 , Figure 1 is a structure diagram of a high-voltage box circuit supporting multi-path charging current collection disclosed by the embodiment of the utility model. Among them, Figure 1 The high-voltage box circuit supporting multi-path charging current collection shown in the figure can be applied to a high-voltage box electrical system, and the embodiment of the utility model is not limited. As shown in Figure 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-charging circuit, wherein:

[0030] 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, the charging negative branch includes a second relay, and the main relay is arranged in parallel with the pre-charging circuit.

[0031] Optionally, the high-voltage box circuit supporting multi-path charging current collection can include at least two charging branches, each charging branch includes a charging positive branch and a charging negative branch, for example, Figure 1 The first charging positive branch and the first charging negative branch in the figure form a first charging branch, the second charging positive branch and the second charging negative branch form a second charging branch, the third charging positive branch and the third charging negative branch form a third charging branch, and the Nth charging positive branch and the Nth charging negative branch form an Nth charging branch.

[0032] 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 when the charging branch is short-circuited, the system can timely fuse the circuit to ensure electrical safety; the current sensor can be used for collecting current data of the charging branch, and further, the collected current data can be transmitted to a BMS device for real-time monitoring of charging current of each branch by the BMS device, ensuring that each branch current is evenly distributed, and solving the problem of branch balanced charging detection.

[0033] Optionally, the main relay is arranged in parallel with the pre-charging circuit, main negative pre-charging is adopted, the use of main positive relay is reduced, and the cost and weight are reduced.

[0034] Optionally, the high-voltage box circuit supporting multi-path charging current collection can further include at least one discharging branch, for example, Figure 1 The first discharging positive branch and the first discharging negative branch in the figure form a first discharging branch, and the Mth discharging positive branch and the Mth discharging negative branch form an Mth discharging branch.

[0035] As can be seen, the embodiment Figure 1The described high-voltage box circuit supporting multi-path charging current collection 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, so that when a short circuit occurs in the charging branch, the system can timely fuse the circuit to ensure electrical safety, and the current sensor is used for collecting current data of the charging branch, so that the current of each branch is evenly distributed, the problem of branch balanced charging detection is solved, and the overall safety and stability of the high-voltage box circuit are improved.

[0036] In an optional embodiment, the pre-charging circuit includes a pre-charging relay and a pre-charging resistor arranged in series.

[0037] Optionally, the pre-charging circuit includes a pre-charging relay and a pre-charging resistor arranged in series, and the pre-charging circuit can be used to balance the voltage between the battery system and the external power supply or load during charging of the high-voltage box circuit, to protect internal components, and the main relay is arranged in parallel with the pre-charging circuit, main negative pre-charging is adopted, the use of the main positive relay is reduced, and the cost and weight are reduced.

[0038] It can be seen that the optional embodiment can balance the voltage between the battery system and the external power supply or load during charging of the high-voltage box circuit through the pre-charging relay and the pre-charging resistor of the pre-charging circuit, protect internal components, improve the safety and stability of the high-voltage box circuit, adopt main negative pre-charging, reduce the use of the main positive relay, and reduce the cost and weight.

[0039] In another optional embodiment, the high-voltage box circuit supporting multi-path charging current collection can further include a number of manual maintenance switches corresponding to the number of charging branches, wherein:

[0040] One end of each charging positive branch is electrically connected to a first end of each manual maintenance switch, and a second end of each manual maintenance switch is electrically connected to a corresponding battery total positive.

[0041] Optionally, the high-voltage box circuit supporting multi-path charging current collection can further include a number of manual maintenance switches corresponding to the number of charging branches, for example, as shown in Figure 1 The number of manual maintenance switches is the same as the number of charging branches, and also the same as the number of battery total positives and battery total negatives, one end of each charging positive branch is electrically connected to a 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; and a second end of each manual maintenance switch is electrically connected to a 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.

[0042] It can be seen that the optional embodiment can realize electrical isolation of the high-voltage box circuit, short-circuit protection, and monitoring of the state of the high-voltage system based on the manual repair switch, realize high-voltage interlocking and other functions, and improve the safety and stability of the high-voltage box circuit.

[0043] In still another optional embodiment, the high-voltage box circuit supporting multi-channel charging current collection can further include a manual repair master control, wherein:

[0044] The manual repair master control and the third end of each manual repair switch form a high-voltage interlocking loop in series.

[0045] Optionally, the manual repair master control and the third end of each manual repair switch form a high-voltage interlocking loop in series, as shown in Figure 1 The first manual repair switch inputs the high-voltage interlocking output of the manual repair master control, and specifically, the manual repair switch (MSD, Manual Service Disconnect) sends a low-voltage electrical signal to the vehicle controller or other related systems when detecting an abnormality in the high-voltage system, for cutting off the high-voltage power supply and triggering an alarm; the Nth manual repair switch receives the high-voltage interlocking output input by the manual repair master control, and specifically, the manual repair switch (MSD) receives a low-voltage electrical signal from each component of the high-voltage system for monitoring 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.

[0046] It can be seen that 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.

[0047] In still another optional embodiment, the high-voltage box circuit supporting multi-channel charging current collection can further include a CAN current sensor corresponding to the number of charging branches, wherein:

[0048] 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.

[0049] Optionally, one end of each charging negative branch is electrically connected to one end of each CAN current sensor, that is, 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 it to the BMS through the CAN bus.

[0050] It can be seen that 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, and then transmit the message data to the BMS through the CAN, so as to improve the collection accuracy and data transmission speed of the current data, improve the current analysis efficiency of the high-voltage box circuit, and further improve the safety of the high-voltage box circuit.

[0051] In yet another optional embodiment, the high-voltage box circuit supporting multi-channel charging current collection can further include a thermal management system, wherein:

[0052] The thermal management system includes a thermal management system fuse and a thermal management system relay arranged in series.

[0053] Optionally, the thermal management system includes 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, and realize remote control.

[0054] 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.

[0055] In yet another optional embodiment, the high-voltage box circuit supporting multi-channel charging current collection can further include a water bath heating system, wherein:

[0056] The water bath heating system includes a water bath heating fuse and a water bath heating relay arranged in series.

[0057] Optionally, the water bath heating system includes 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.

[0058] 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.

[0059] In yet another optional embodiment, each two charging branches form a super charging gun.

[0060] Further, the branch type of one charging branch in the super charging gun includes a national standard terminal type, and the branch type of the other charging branch in the super charging gun includes a super charging terminal type.

[0061] 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 Figure 1 The first charging positive branch and the first charging negative branch in the super charging gun 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 Figure 1 The second charging positive branch and the second charging negative branch in the super charging gun are both of the super charging terminal type.

[0062] 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 fuses and current sensors are arranged on each charging branch to ensure balanced distribution of current of each branch, solve the problem of balanced charging detection of branches, and improve the charging safety of the super charging gun.

[0063] Embodiment two

[0064] Referring to Figure 2 , Figure 2 is a structural schematic diagram of a high-voltage box electrical system according to an embodiment of the utility model. Wherein, Figure 2 The high-voltage box electrical system shown in the figure can include the high-voltage box circuit supporting multi-channel charging current acquisition disclosed in embodiment one, and the functions of the high-voltage box circuit supporting multi-channel charging current acquisition include but are not limited to 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 loop to ensure electrical safety, and the current data of the charging branch is collected by the current sensor to ensure balanced distribution of current of each branch and solve the problem of balanced charging detection of branches. It should be noted that for detailed description of the high-voltage box circuit supporting multi-channel charging current acquisition, please refer to the specific description of the related content in embodiment one, and the present embodiment will not be described again.

[0065] It can be seen that the high-voltage box electrical system described in Figure 2 can set fuses and current sensors 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 loop to ensure electrical safety, and the current data of the charging branch is collected by the current sensor to ensure balanced distribution of current of each branch and solve the problem of balanced charging detection of branches, thereby improving the overall safety and stability of the high-voltage box electrical system.

[0066] The high-voltage box circuit and the high-voltage box electrical system supporting the multi-path charging current collection disclosed in the above embodiments of the utility model are described in detail, the principles and implementation manners of the utility model are described in this paper by applying specific embodiments, but the above preferred embodiments are not used to limit the utility model, the above embodiment description is only used to help understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the art, according to the idea of the utility model, there will be changes in specific implementation manners and application ranges without departing from the spirit and scope of the utility model, therefore, the protection scope of the utility model is the range defined by the claims.

Claims

1. A high-voltage box circuit supporting multi-channel charging current collection, characterized in that: The circuit includes at least two charging branches, a main relay and a pre-charging circuit, wherein: Each charging branch includes a positive charging branch and a negative charging branch. The positive charging branch includes a fuse, a current sensor and a first relay arranged in series. The negative charging branch includes a second relay. The main relay is arranged in parallel with the pre-charging circuit.

2. The high-voltage box circuit supporting multi-channel charging current collection according to claim 1, characterized in that: The pre-charging circuit includes a pre-charging relay and a pre-charging resistor arranged in series.

3. The high-voltage box circuit supporting multi-channel charging current collection according to claim 1 or 2, characterized in that: The circuit further includes manual maintenance switches corresponding to the number of the charging branches, wherein: One end of each of the positive charging branches is electrically connected to the first end of each of the manual maintenance switches, and the second end of each of the manual maintenance switches is electrically connected to the total positive power of the corresponding battery.

4. The high-voltage box circuit supporting multi-channel charging current collection according to claim 3, characterized in that: The circuit also includes a manual repair master control, wherein: The manual repair master control is connected in series with the third end of each manual repair switch to form a high-voltage interlocking circuit.

5. The high-voltage box circuit supporting multi-channel charging current collection according to claim 1 or 2, characterized in that: The circuit further includes CAN current sensors corresponding to the number of the charging branches, wherein: One end of each of the negative charging branches is electrically connected to one end of each of the CAN current sensors, and the other end of each of the CAN current sensors is electrically connected to the corresponding total negative power supply of the battery.

6. The high-voltage box circuit supporting multi-channel charging current collection according to claim 1 or 2, characterized in that: The circuit also includes a thermal management system, wherein: The thermal management system includes a thermal management system fuse and a thermal management system relay arranged in series.

7. The high-voltage box circuit supporting multi-channel charging current collection according to claim 1 or 2, characterized in that: 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 which are arranged in series.

8. The high-voltage box circuit supporting multi-channel charging current collection according to claim 1 or 2, characterized in that: Every two charging branches form a supercharging gun.

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

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