Safety control circuit and vehicle

Abstract

The utility model provides a safety control circuit and a vehicle, and belongs to the technical field of contactor control, the safety control circuit comprises a power supply positive wire, a power supply negative wire, a safety switch, a contactor and a control module; the power supply positive wire is connected with the control module, the control module is connected with the contactor through the safety switch, and the power supply negative wire is connected with the control module and the contactor. When the safety switch is disconnected, the contactor is disconnected with the power supply positive wire, and the control module is kept in a working state, because the safety switch and the control module are arranged between the power supply positive wire and the contactor, after the safety switch is cut off, the contactor is powered off, but the control module is still kept in the working state, so that when the contactor is disconnected, the contactor is powered off. The work of the control module is not affected, BMS hardware does not need to be changed, and the test cost is effectively saved while convenience is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of contactor control, in particular to a safety control circuit and a vehicle. Background Art

[0002] The main positive and negative contactors of the high-voltage battery pack of new energy vehicles are controlled by the Battery Management System (BMS). When repairing new energy vehicles, it is necessary to cut off the power supply of the main positive or negative contactor of the battery pack through the safety switch to ensure that the battery pack is in a circuit-breaking state when the maintenance personnel disassemble the high-voltage line, but other functions of the BMS still need to work normally. The current BMS requires two 12V+ power supplies, one of which only supplies power to the contactor control circuit. The power supply line loop is extended to the fuse box, and a safety switch is added. The switch loop is disconnected when it is pulled out, and the contactor power supply is disconnected and cannot be closed. One way supplies power to other MCU and other chips of the BMS to ensure that the BMS works normally when the contactor power supply line is disconnected, and the two 12V+ power supplies do not affect each other.

[0003] However, for some BMS, the safety switch is not taken into consideration during the design phase. Therefore, when there is only one 12V+ power supply, if testing is required, the BMS hardware needs to be changed, resulting in a large amount of cost waste. Utility Model Content

[0004] The utility model provides a safety control circuit and a vehicle, which are used to solve the defect of high BMS cost when only one 12V+ power supply is used for testing in the prior art.

[0005] On the one hand, the utility model provides a safety control circuit, including: a positive power line, a negative power line, a safety switch, a contactor and a control module;

[0006] The positive power line is connected to the control module, and the control module is also connected to the contactor through the safety switch, and the negative power line is connected to the control module and the contactor respectively;

[0007] When the safety switch is disconnected, the contactor is disconnected from the positive power line, and the control module remains in an operating state.

[0008] According to a safety control circuit provided by the utility model, the control module includes a control chip and a high-side control unit;

[0009] One end of the control chip is connected to the positive power line and the negative power line respectively, the control chip is also connected to the high-side control unit, and the high-side control unit is also connected to the contactor through the safety switch;

[0010] The control chip supplies positive power to the contactor through the high-side control unit, and when the safety switch is disconnected, the contactor is disconnected from the positive power line.

[0011] According to a safety control circuit provided by the utility model, it also includes a power supply;

[0012] The negative electrode of the power supply is connected to the negative electrode line of the power supply, and the positive electrode of the power supply is connected to the positive electrode line of the power supply;

[0013] The power supply is used to supply power to the contactor and the control module.

[0014] According to a safety control circuit provided by the utility model, it also includes a fuse box;

[0015] The fuse box is connected in series between the positive power line and the positive electrode of the power supply;

[0016] When the safety control circuit is abnormal, the fuse box disconnects the power supply of the power source.

[0017] According to a safety control circuit provided by the utility model, the contactor includes a main positive contactor and a main negative contactor.

[0018] According to a safety control circuit provided by the utility model, the control module is arranged inside the battery management system, and the safety switch is arranged outside the battery management system.

[0019] According to a safety control circuit provided by the utility model, the battery management system further includes: a fuse;

[0020] The fuse is used to disconnect when there is overcurrent or overvoltage, so as to protect the battery management system.

[0021] According to a safety control circuit provided by the utility model, the fuse includes an air-conditioning fuse, a PTC fuse and an intelligent fuse;

[0022] The air conditioner fuse is used to protect the air conditioner in case of overcurrent or overvoltage;

[0023] The PTC fuse is used to protect the PTC in case of overcurrent or overvoltage;

[0024] The intelligent fuse is used to protect the control module when the control module is over-current or over-voltage.

[0025] According to a safety control circuit provided by the utility model, there is one positive power line and one negative power line.

[0026] On the other hand, the utility model further provides a vehicle, comprising the safety control circuit as described in any one of the above items.

[0027] The utility model provides a safety control circuit and a vehicle, wherein the safety control circuit comprises: a positive power line, a negative power line, a safety switch, a contactor and a control module; the positive power line is connected to the control module, the control module is also connected to the contactor through the safety switch, and the negative power line is connected to the control module and the contactor respectively; when the safety switch is disconnected, the contactor is disconnected from the positive power line, and the control module remains in a working state. Since the safety switch and the control module are arranged between the positive power line and the contactor, when the safety switch is cut off, the contactor is powered off, but the control module remains in a working state, so that when the contactor is disconnected, the operation of the control module is not affected, and there is no need to change the BMS hardware, which is convenient and effectively saves the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the principle of the safety control circuit provided by the embodiment of the utility model;

[0030] Figure 2 It is a circuit connection diagram of a safety control circuit provided in an embodiment of the utility model.

[0031] Reference numerals:

[0032] 1. Positive power line; 2. Negative power line; 3. Safety switch; 4. Contactor; 41. Main positive contactor; 42. Main negative contactor; 43. Pre-charge contactor; 5. Control module; 51. Control chip; 52. High-side drive unit; 6. Battery management system; 7. Power supply; 8. Fuse box; 91. Air conditioning fuse; 92. PTC fuse; 93. Smart fuse; 10. DC fast charge +; 11. DC fast charge -. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Combine the following Figure 1-Figure 2 The utility model describes a safety control circuit and a vehicle.

[0035] Figure 1 It is a schematic diagram of the principle of the safety control circuit provided by the embodiment of the utility model. Figure 2 It is a circuit connection diagram of a safety control circuit provided in an embodiment of the utility model.

[0036] like Figure 1 and Figure 2 As shown, a safety control circuit provided in this embodiment includes: a positive power line 1, a negative power line 2, a safety switch 3, a contactor 4 and a control module 5; the positive power line 1 is connected to the control module 5, and the control module 5 is also connected to the contactor 4 through the safety switch 3, and the negative power line 2 is connected to the control module 5 and the contactor 4 respectively; when the safety switch 3 is disconnected, the contactor 4 is disconnected from the positive power line 1, and the control module 5 remains in a working state. Among them, the positive power line 1 is one line, and the negative power line 2 is one line.

[0037] In a specific implementation process, the function of the safety control circuit is to achieve independent control of the contactor 4 and the control module 5 through a positive power line 1 (12V+power supply) and a negative power line 2, that is, when the contactor 4 is disconnected, the power supply of the control module 5 is not affected. Figure 1 The schematic diagram of the safety control circuit shows that the contactor 4 only has one main positive contactor 41. The other contactors have the same principle and are not shown in detail in the figure. The contactor 4 includes a main positive contactor 41, a main negative contactor 42 and a pre-charge contactor 43. Figure 1 and Figure 2 The power supply principle corresponding to the main positive contactor 41 and the control module 5 can be clearly seen. The control module 5 is powered by the positive power line 1 (12V+) and the negative power line 2 (12V-), while the main positive contactor 41 is powered by the positive power line 1 through the control module 5 to supply power to one end of the main positive contactor 41, and the negative power line 2 directly supplies power to the other end of the main positive contactor 41.

[0038] The specific working process is that when the safety switch 3 is closed, the control module 5 and the contactor 4 are both in normal working state, and the positive power line 1 and the negative power line 2 are directly connected to the control module 5 to supply power to the control module 5. The positive power line 1 is also connected to the safety switch 3 through the control module 5, and the safety switch 3 is also connected to the contactor 4, thereby realizing the connection between the positive power line 1 and the contactor 4, that is, the control module 5 and the safety switch 3 are arranged between the positive power line 1 and the contactor 4, and the other end of the contactor 4 is directly connected to the negative power line 2. Thus, the control module 5 and the contactor 4 can both be powered. When the connection of the safety switch 3 is cut off, the connection of the control module 5 is not affected, and the positive power line 1 and the negative power line 2 normally supply power to the control module 5. However, the positive power line 1 at the end of the contactor 4 is affected, and the connection with the contactor 4 is disconnected. Although the connection of the negative power line 2 is not affected, the contactor 4 is still in a disconnected state. Therefore, when the safety switch 3 is disconnected, the contactor 4 disconnects the power supply, but the control module 5 remains in a working state.

[0039] Among them, since the safety switch 3 is arranged between the control module 5 and the contactor 4, the on and off of the safety switch 3 can only control the power supply of the contactor 4, but cannot affect the power supply of the control module 5, so that when the safety switch 3 is disconnected, the control module 5 can still remain in the working state. Thus, the contactor 4 and the control module 5 are individually controlled through one positive power line 1 and one negative power line 2. When testing is required, there is no need to change the hardware layout of the BMS, which effectively saves the testing cost.

[0040] Further, based on the above embodiment, Figure 1 As shown, the control module 5 in this embodiment includes a control chip 51 and a high-side control unit; one end of the control chip 51 is respectively connected to the positive power line 1 and the negative power line 2, and the control chip 51 is also connected to the high-side control unit, and the high-side control unit is also connected to the contactor 4 through the safety switch 3; the control chip 51 supplies positive power to the contactor 4 through the high-side control unit, and when the safety switch 3 is disconnected, the contactor 4 is disconnected from the positive power line 1.

[0041] Specifically, the control chip 51 can be an MCU chip, the high-side control unit can be an HSD high-side control circuit, the control chip 51 is directly powered by the positive power line 1 and the negative power line 2, and the control chip 51 is also connected to the safety switch 3 through the high-side drive unit 52, so that the positive power supply of the contactor 4 is controlled by the control chip 51 and the high-side drive unit 52. When the safety switch 3 is disconnected, the power supply of the control chip 51 will not be affected, and the working state can be maintained continuously. And due to the existence of the high-side drive unit 52, the disconnection of the safety switch 3 will not affect the control chip 51, which better ensures the normal operation of the control chip 51.

[0042] Further, based on the above embodiment, Figure 2 As shown, the safety control circuit in this embodiment also includes a power supply 7 and a fuse box 8; the negative electrode of the power supply 7 is connected to the negative power supply line 2, and the positive electrode of the power supply 7 is connected to the positive power supply line 1; the power supply 7 is used to supply power to the contactor 4 and the control module 5. The fuse box 8 is connected in series between the positive power supply line 1 and the positive electrode of the power supply 7; when the safety control circuit is abnormal, the fuse box 8 disconnects the power supply of the power supply 7.

[0043] Specifically, the power source 7 can be a 12V battery. It is more convenient to power the control module 5 and the contactor 4 with a single 12V battery. Moreover, the power source 7 is arranged outside the battery management system 6. When the power source fails or is abnormal, it is also convenient to inspect and maintain, and it is also convenient to cut off the power supply of the battery management system 6. The provision of the fuse box 8 can ensure that the battery management system 6 will not have overcurrent or overvoltage, and can effectively protect the battery management system 6, thereby ensuring the safety of the vehicle.

[0044] Furthermore, the control module 5 in this embodiment is arranged inside the battery management system 6, and the safety switch 3 is arranged outside the battery management system.

[0045] Specifically, the control module 5 is arranged inside the battery management system 6, which can better protect the battery management system 6 and can achieve dustproof and waterproof, etc. The safety switch 3 is arranged outside the battery management system 6, which is convenient for on-off control of the contactor 4 through the safety switch 3, and is convenient for maintenance, etc. Moreover, the safety switch 3 is arranged outside the battery management system 6, and there is no need to change the hardware of the battery management system 6 during maintenance or testing, which effectively improves the test efficiency and avoids the cost waste caused by hardware replacement. For example, performing EMC, DV, PV and other related tests can save about two million in various test costs.

[0046] Further, such as Figure 2 As shown, the battery management system 6 in this embodiment also includes: a fuse; the fuse is used to disconnect when there is overcurrent or overvoltage to protect the battery management system 6. The fuse includes an air conditioning fuse 91, a PTC fuse 92 and an intelligent fuse 93; the air conditioning fuse 91 is used to protect the air conditioner when there is overcurrent or overvoltage; the PTC fuse 92 is used to protect the PTC when there is overcurrent or overvoltage; the intelligent fuse 93 is used to protect the control module 5 when there is overcurrent or overvoltage.

[0047] Specifically, the fuse may be a current fuse, which refers to an electrical appliance that, when the current exceeds a specified value, generates heat to melt the fuse and disconnect the circuit, thereby protecting subsequent connection devices. Figure 2The air conditioner fuse 91 is connected to the air conditioner, the PTC fuse 92 is connected to the PTC, and the smart fuse 93 is connected to the control chip 51. Thus, the three different fuses can protect different devices to ensure that different devices will not be affected by overcurrent, effectively improving the service life of each device in the battery management system 6.

[0048] The battery management system 6 also includes a fast charging interface, including a DC fast charging +10 and a DC fast charging -11, which mainly realizes the charging control of the vehicle. It also includes a current sensor, etc., which is mainly used to monitor the real-time current. When the current is abnormal, the battery management system 6 can be protected in time.

[0049] Based on the same general utility model concept, the utility model also protects a vehicle, including the safety control circuit of any of the above embodiments.

[0050] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0051] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A safety control circuit, characterized in that: include: Positive power line, negative power line, safety switch, contactor and control module; The positive power line is connected to the control module, and the control module is also connected to the contactor through the safety switch, and the negative power line is connected to the control module and the contactor respectively; When the safety switch is disconnected, the contactor is disconnected from the positive power line, and the control module remains in an operating state.

2. The safety control circuit according to claim 1, characterized in that: The control module includes a control chip and a high-side control unit; One end of the control chip is connected to the positive power line and the negative power line respectively, the control chip is also connected to the high-side control unit, and the high-side control unit is also connected to the contactor through the safety switch; The control chip supplies positive power to the contactor through the high-side control unit, and when the safety switch is disconnected, the contactor is disconnected from the positive power line.

3. The safety control circuit according to claim 1, characterized in that: Also includes a power supply; The negative electrode of the power supply is connected to the negative electrode line of the power supply, and the positive electrode of the power supply is connected to the positive electrode line of the power supply; The power supply is used to supply power to the contactor and the control module.

4. The safety control circuit according to claim 3, characterized in that: Also includes fuse box; The fuse box is connected in series between the positive power line and the positive electrode of the power supply; When the safety control circuit is abnormal, the fuse box disconnects the power supply of the power source.

5. The safety control circuit according to claim 1, characterized in that: The contactor includes a main positive contactor and a main negative contactor.

6. The safety control circuit according to claim 1, characterized in that: The control module is arranged inside the battery management system, and the safety switch is arranged outside the battery management system.

7. The safety control circuit according to claim 6, characterized in that: The battery management system further includes: a fuse; The fuse is used to disconnect when there is overcurrent or overvoltage, so as to protect the battery management system.

8. The safety control circuit according to claim 7, characterized in that: The fuses include air conditioner fuses, PTC fuses and intelligent fuses; The air conditioner fuse is used to protect the air conditioner in case of overcurrent or overvoltage; The PTC fuse is used to protect the PTC in case of overcurrent or overvoltage; The intelligent fuse is used to protect the control module when the control module is over-current or over-voltage.

9. The safety control circuit according to any one of claims 1 to 8, characterized in that: There is one positive power line and one negative power line.

10. A vehicle, characterized in that: Comprising the safety control circuit as described in any one of claims 1-9.

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