Integrated current sensor, high-voltage box and vehicle

Abstract

The utility model provides an integrated current sensor, a high-voltage box and a vehicle, and the integrated current sensor comprises a first measurement channel and a second measurement channel, the first measurement channel is a shunting effect channel, and the second measurement channel is a Hall effect channel; the first measurement channel and the second measurement channel are connected to a circuit to be measured and are used for measuring the current of the circuit to be measured; and the second measurement channel is also used for replacing the first measurement channel to carry out current measurement when the first measurement channel is abnormal. The integrated current sensor provided by the utility model has a relatively high integration level, and high-voltage safety is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of current sensors, and in particular to an integrated current sensor, a high-voltage box and a vehicle. Background Art

[0002] A current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal or other required form of information output that meets certain standards according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control.

[0003] Current sensors have been widely used in various fields, especially in the automotive field. In the prior art, the current sensors on electric vehicles have a low level of integration and cannot meet the existing technical requirements. Utility Model Content

[0004] In view of this, an object of the present application is to provide an integrated current sensor, a high-voltage box and a vehicle to overcome the problems in the prior art.

[0005] In a first aspect, an embodiment of the present application provides an integrated current sensor, the integrated current sensor comprising:

[0006] A first measurement channel and a second measurement channel, wherein the first measurement channel is a shunt effect channel and the second measurement channel is a Hall effect channel; the first measurement channel and the second measurement channel are both connected to the circuit to be measured and are used to measure the current of the circuit to be measured; the second measurement channel is also used to replace the first measurement channel for current measurement when the first measurement channel is abnormal.

[0007] In some technical solutions of the present application, the above-mentioned first measurement channel is constructed by a shunt, and the second measurement channel is constructed by a Hall current sensor; the integrated current sensor also includes a bar; the shunt and the Hall current sensor are both connected to the bar; the bar is also connected to the circuit board.

[0008] In some technical solutions of the present application, the above-mentioned blade includes a first area, a second area, and a third area; wherein the operating temperatures of the first area, the second area, and the third area decrease in sequence;

[0009] The shunt is disposed in the first and second regions of the bar, and the Hall current sensor is disposed in the third region of the bar.

[0010] In some technical solutions of the present application, the alloy of the shunt is arranged in the first area, and the copper busbar of the shunt is arranged in the second area.

[0011] In some technical solutions of the present application, the above-mentioned bar passes through the diverter, the first part of the diverter is located on the upper side of the bar, and the second part of the diverter is located on the lower side of the bar; wherein, the second part includes an acquisition board and a thermistor, and the acquisition board and the thermistor are connected to the circuit board.

[0012] In some technical solutions of the present application, a slot is provided in the third area, and the Hall current sensor is surrounded on the bar through the slot.

[0013] In some technical solutions of the present application, a fixing hole is further provided on the surface of the above-mentioned tab, and the tab is fixed to the circuit board through the fixing hole.

[0014] In some technical solutions of the present application, the current to be measured of the above-mentioned circuit to be measured passes through the shunt and the Hall current sensor in sequence.

[0015] In a second aspect, an embodiment of the present application provides a high-voltage box, comprising the above-mentioned integrated current sensor, a battery, an active fuse, a main positive relay, a main negative relay, and an intelligent fuse.

[0016] In a third aspect, an embodiment of the present application provides a vehicle comprising the above-mentioned high-voltage box and battery management system.

[0017] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0018] The integrated current sensor in this application includes a first measurement channel and a second measurement channel. The first measurement channel is a shunt effect channel, and the second measurement channel is a Hall effect channel. Both the first and second measurement channels are connected to the circuit under test to measure the current in the circuit under test. The second measurement channel is also used to replace the first measurement channel for current measurement when the first measurement channel is abnormal. The integrated current sensor in this application has a high degree of integration, ensuring high-voltage safety.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1A schematic diagram of an integrated current sensor provided in an embodiment of the present application is shown;

[0022] Figure 2 A front schematic diagram of an integrated current sensor provided in an embodiment of the present application is shown;

[0023] Figure 3 A schematic side view of an integrated current sensor provided in an embodiment of the present application is shown;

[0024] Figure 4 A schematic diagram of a bar segment partitioning method provided in an embodiment of the present application is shown;

[0025] Figure 5 A schematic diagram of a high-voltage box provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0027] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0028] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0029] A current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal or other required form of information output that meets certain standards according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control.

[0030] Current sensors have been widely used in various fields, especially in the automotive field. In the prior art, the current sensors on electric vehicles have a low level of integration and cannot meet the existing technical requirements.

[0031] Based on this, embodiments of the present application provide an integrated current sensor, a high-voltage box, and a vehicle, which are described below through embodiments.

[0032] Figure 1 A schematic diagram of an integrated current sensor provided by an embodiment of the present application is shown, and some implementation methods of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Specifically:

[0033] The integrated current sensor includes: a first measurement channel and a second measurement channel, wherein the first measurement channel is a shunt effect channel and the second measurement channel is a Hall effect channel; the first measurement channel and the second measurement channel are both connected to the circuit to be measured and are used to measure the current of the circuit to be measured; the second measurement channel is also used to replace the first measurement channel for current measurement when the first measurement channel is abnormal.

[0034] like Figure 2 and Figure 3 As shown, the first measurement channel is constructed by a shunt 2, and the second measurement channel is constructed by a Hall current sensor 3; the integrated current sensor also includes a bar 1; the shunt 2 and the Hall current sensor 3 are both connected to the bar 1; the bar 1 is also connected to the circuit board.

[0035] Shunt 2 is a device used for current measurement and protection circuits. Its working principle is to measure and control the current by diverting the current to different paths. Shunt 2 usually consists of a low-resistance element (called a shunt resistor) and an ammeter for measuring the current. When current flows through the circuit to be tested, part of the current will pass through the shunt resistor, while the other part of the current will pass through other circuit elements. According to the distribution of the current, the current size of the entire circuit can be measured based on the voltage drop of the shunt resistor. Because the shunt resistor has an extremely low resistance value, usually in the milliohm or microohm level, most of the current will pass through it instead of other circuit elements. By measuring the voltage drop across the shunt resistor, the value of the current can be calculated using Ohm's law. In some cases, shunt 2 can also be used to protect the circuit: when the current exceeds a preset threshold, shunt 2 can trigger a protection mechanism, such as cutting off the power supply or triggering an alarm. Shunt 2 measures and controls the current by diverting the current to the shunt resistor and other circuit elements.

[0036] The Hall current sensor 3 is based on the magnetic equilibrium Hall principle. According to the Hall effect principle, when a current Ic is passed through the control current terminal of a Hall element and a magnetic field with a magnetic induction intensity B is applied in the direction normal to the plane of the Hall element, an electric potential VH is generated perpendicular to the current and magnetic field (i.e., between the Hall output terminals). This potential, called the Hall potential, is proportional to the product of the control current I and the magnetic induction intensity B. Specifically, VH = KHIcBsinθ, where K is the Hall coefficient, determined by the material of the Hall element; I is the control current; B is the magnetic induction intensity; and VH is the Hall potential.

[0037] The bars 1 are usually used as an important component of current collection and transmission. As current collecting strips, they can effectively collect and transmit current, while having conductive properties, stability and reliability to support the normal operation of the battery and improve the overall performance.

[0038] In an optional embodiment, if Figure 4 As shown, the bar 1 in the embodiment of the present application is divided into three areas: a first area 5, a second area 6, and a third area 7. When the circuit to be tested is detected, the operating temperatures of the first area 5, the second area 6, and the third area 7 decrease in sequence. The shunt 2 is disposed in the first area 5 and the second area 6 of the bar 1. Specifically, the alloy of the shunt 2 is disposed in the first area 5, and the copper busbar of the shunt 2 is disposed in the second area 6. The Hall current sensor 3 is disposed in the third area 7 of the bar 1.

[0039] When the bar 1 is connected to the shunt 2 and the Hall current sensor 3, the bar 1 passes through the shunt 2 and the Hall current sensor 3. Specifically, the first part of the shunt 2 is located on the upper side of the bar 1, and the second part of the shunt 2 is located on the lower side of the bar 1; wherein, the second part includes an acquisition board and a thermistor, and the acquisition board and the thermistor are connected to the circuit board. The third area 7 is provided with a card slot, and the Hall current sensor 3 is surrounded by the bar 1 through the card slot. The surface of the bar 1 is also provided with a fixing hole 4, and the bar 1 is fixed to the circuit board through the fixing hole 4. When the integrated current sensor detects the circuit to be tested, the current to be tested of the circuit to be tested passes through the shunt 2 and the Hall current sensor 3 in sequence.

[0040] In an optional embodiment, if Figure 5 As shown, the present application discloses a high-voltage box, including the above-mentioned integrated current sensor, a battery, an active fuse, a main positive relay, and a main negative relay. The positive terminal of the battery is connected in sequence to the active fuse, the main positive relay, the main negative relay, the integrated current sensor, and the smart fuse, which is then connected to the negative terminal of the battery.

[0041] In an optional embodiment, the embodiment of the present application discloses a vehicle, including the high-voltage box and battery management system. Through the collaborative control of the BMS and the high-voltage box, the rational distribution of the power supply of the whole vehicle is achieved, and the high-voltage safety of the power battery is jointly guaranteed in terms of the charging system, discharge system, monitoring system, thermal management, and battery life; it is divided into three high-voltage outputs, namely GCU, front drive and rear drive, which are parallel outputs. The pre-charge circuit is designed with separate main positive and main negative relays, and charging and discharging are achieved through the BMS control coil. The integrated current sensor has Shunt and Hall detection functions, which fully guarantee functional safety while ensuring temperature rise and accuracy, and the signal acquisition is output to the BMU; the Hall coil in the integrated current sensor is first fixed at the narrow diameter 4*8.5mm of the bar 1, and then the Hall shell is integrally injection molded. The Shunt acquisition board and NTC are directly connected to the PCB board to reduce contact resistance. The manganese-copper alloy design is no different from the traditional design; the size of the integrated current sensor bar 1 is L84*W36*H4mm, and the cross-sectional area reaches 144mm 2 , with a continuous flow capacity of 500A, solving the problem of small cross-sectional area of ​​independent Hall installation bar 1 (W19*H5=95mm 2 Each high-voltage output connector is equipped with a high-voltage interlock circuit to ensure high-voltage safety.

[0042] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. The system embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of the system or unit, which can be electrical, mechanical or other forms.

[0043] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, and may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment as needed.

[0044] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0045] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0046] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. However, these modifications, changes, or replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. An integrated current sensor, characterized in that: The integrated current sensor includes: a first measurement channel and a second measurement channel, wherein the first measurement channel is a shunt effect channel and the second measurement channel is a Hall effect channel; the first measurement channel and the second measurement channel are both connected to the circuit to be measured and are used to measure the current of the circuit to be measured; the second measurement channel is also used to replace the first measurement channel for current measurement when the first measurement channel is abnormal.

2. The integrated current sensor according to claim 1, characterized in that The first measurement channel is constructed by a shunt, and the second measurement channel is constructed by a Hall current sensor; the integrated current sensor also includes a bar; the shunt and the Hall current sensor are both connected to the bar; the bar is also connected to a circuit board.

3. The integrated current sensor according to claim 2, characterized in that The blade includes a first area, a second area, and a third area; wherein the operating temperatures of the first area, the second area, and the third area decrease in sequence; The shunt is disposed in the first and second regions of the bar, and the Hall current sensor is disposed in the third region of the bar.

4. The integrated current sensor according to claim 3, characterized in that: The alloy of the shunt is arranged in the first area, and the copper busbar of the shunt is arranged in the second area.

5. The integrated current sensor according to claim 2, characterized in that: The bar passes through the diverter, the first part of the diverter is located on the upper side of the bar, and the second part of the diverter is located on the lower side of the bar; wherein the second part includes an acquisition board and a thermistor, and the acquisition board and the thermistor are connected to the circuit board.

6. The integrated current sensor according to claim 3, characterized in that: The third area is provided with a slot, and the Hall current sensor is surrounded on the bar through the slot.

7. The integrated current sensor according to claim 2, characterized in that: A fixing hole is also provided on the surface of the tab, and the tab is fixed to the circuit board through the fixing hole.

8. The integrated current sensor according to claim 2, characterized in that: The current to be measured of the circuit to be measured passes through the shunt and the Hall current sensor in sequence.

9. A high voltage box, characterized in that: The device comprises the integrated current sensor according to any one of claims 1 to 8, a battery, an active fuse, a main positive relay, a main negative relay, and an intelligent fuse.

10. A vehicle, characterized in that: The invention comprises the high voltage box and the battery management system as claimed in claim 9.

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