A relay control device, a relay control module, and a control method thereof.

Abstract

This application discloses a relay control device, a relay control module, and a control method thereof. The relay control module includes: a relay circuit; and a relay control board for receiving and processing signals from the relay circuit according to control commands. The relay circuit further includes a pre-charge relay circuit and a main relay circuit connected in parallel. The pre-charge relay circuit includes a pre-charge relay and a pre-charge resistor connected in series with the pre-charge relay. The relay control board controls the on / off state of the pre-charge relay according to the pre-charge time and the magnitude of the detected current, so that the current passing through the pre-charge resistor remains within a limit, ensuring the normal working state of the pre-charge resistor. The main relay circuit includes a main relay. The relay control board controls the on / off state of the main relay according to the magnitude of the detected current, so that the main relay cuts off at a set current, avoiding arcing or even sticking of the main relay when cutting off at a large current, thereby improving the service life of the main relay.

Description

Technical Field

[0001] This invention relates to the field of relay control technology, specifically to a relay control device, a relay control module, and a control method thereof. Background Technology

[0002] High-voltage relays are the connection hubs for the input and output of power batteries, controlling the opening and closing of the relays to achieve the switching of input and output. Currently, most new energy vehicles use electromagnetic relays. When applied in capacitive load circuits, a pre-charge circuit needs to be added. Because of the pre-charge resistance, a smaller pre-charge relay can be selected to withstand the current pulse when powered on. However, because the main circuit has a larger current, a larger main relay is usually required.

[0003] In the current field of new energy vehicles, relay control devices detect the voltage between the front and rear ends of the relay through the vehicle controller, and control the relay's on / off state based on the voltage difference between the front and rear ends. Figure 1 As shown. Its problems are as follows:

[0004] When a relay is used in a capacitive load circuit for pre-charging, if the downstream load is working or malfunctions, the pre-charging current will be too large, which can easily burn out the pre-charging resistor.

[0005] When a relay is used in the main circuit, a large current flows through the relay. If the relay is disconnected under a large current load, an electric arc is easily generated at the relay contacts, causing the relay contacts to stick together and affecting the relay's lifespan. Summary of the Invention

[0006] This invention provides a relay control device, a relay control module, and a control method thereof, which solves the problems of easy burnout of the pre-charge resistor and easy sticking of the main relay contacts in existing relay control.

[0007] To achieve the above objectives, the present invention discloses the following technical solution:

[0008] This invention provides a relay control module, comprising:

[0009] Relay circuit;

[0010] A relay control board is used to receive and process relay circuit signals according to control commands.

[0011] The relay circuit connected in series with the current sensor further includes a pre-charge relay circuit and a main relay circuit connected in parallel; wherein,

[0012] The precharge relay circuit includes a precharge relay and a precharge resistor connected in series with the precharge relay. The relay control board controls the on / off state of the precharge relay according to the precharge time and the magnitude of the detected current, so that the current passing through the precharge resistor remains within the limit.

[0013] The main relay circuit includes a main relay, and the relay control board controls the on / off state of the main relay according to the magnitude of the detected current, so that the main relay is cut off under the set current.

[0014] The aforementioned relay control module also includes multiple connecting leads; among which,

[0015] The front and rear ends of the relay circuit are respectively connected to the relay control board via a first connecting lead and a fourth connecting lead, for detecting the voltage difference between the front and rear ends of the relay circuit.

[0016] The output signal of the precharge relay is transmitted to the relay control board through the second connection lead;

[0017] The output signal of the main relay is transmitted to the relay control board through the third connection lead;

[0018] The current signal from the current sensor is transmitted to the relay control board via the fifth connecting lead.

[0019] The relay control module described above includes a main control chip, and a drive unit, a communication unit, a power supply unit, and a detection unit that are electrically connected to the main control chip.

[0020] Furthermore, in the aforementioned relay control module, the detection unit includes a voltage detection unit and a current detection unit. The fourth connecting lead is connected to the voltage detection unit, and the fifth connecting lead is connected to the current detection unit. The main control chip controls the pre-charge relay to operate based on the voltage and / or current values ​​detected by the voltage detection unit and / or the current detection unit; or, the main control chip controls the main relay to operate based on the current value detected by the current detection unit.

[0021] The aforementioned relay control module also includes a circuit fuse, one end of which is connected to the current sensor and the other end is connected to the downstream load.

[0022] The aforementioned relay control module, wherein the relay control board controls the on / off state of the precharge relay based on the precharge time and the magnitude of the detected current, further includes the following during normal precharge:

[0023] When the back-end load is in standby and without fault, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the pre-charge time T < t and the voltage difference U between the front and back ends of the relay circuit is detected to be < aV, the main relay is closed, and the pre-charge relay is opened after a delay time t1 to complete the pre-charge process. Here, t and aV are the set pre-charge time and the set voltage difference, respectively.

[0024] When the back-end load is in standby mode and without fault, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the pre-charge time T > t and the voltage difference U between the front and back ends of the relay circuit is detected to be greater than aV, the pre-charge relay is opened and the main relay is not closed, and a pre-charge fault is reported.

[0025] Furthermore, the relay control board controls the on / off state of the precharge relay based on the precharge time and the magnitude of the detected current, and also includes the following during the precharge process:

[0026] When the back-end load is working or malfunctions, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the current sensor detects a current value I < b1, if the pre-charge time T < t and the voltage difference U between the front and back ends of the relay circuit is detected to be U < aV, the main relay is closed, and the pre-charge relay is opened after a delay of t1 to complete the pre-charge process. Here, b1 is the set pre-charge current value.

[0027] When the back-end load is working or malfunctions, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the current sensor detects a current value I < b1, if the pre-charge time T > t and the voltage difference U between the front and back ends of the relay circuit is detected to be greater than aV, the pre-charge relay is opened and the main relay is not closed, and a pre-charge fault is reported.

[0028] When the back-end load is working or malfunctions, if the current sensor detects a current value I > b1, the pre-charge relay will be disconnected and the main relay will not be closed, thus reporting a pre-charge fault.

[0029] The aforementioned relay control module, wherein the relay control board controls the on / off state of the main relay based on the detected current magnitude, further includes:

[0030] When the back-end load or battery is working normally and the main relay is powered off, after the current sensor detects a current value I < b2, the relay control board issues a main relay disconnect command to control the main relay to cut off, where b2 is the set disconnect current value;

[0031] When a fault occurs at the back-end load or battery end, after the current sensor detects a current value I < b2, the relay control board issues a main relay disconnect command to control the main relay to cut off.

[0032] Another aspect of the present invention provides a relay control device for power battery charging control, the control device including the relay control module described in the first aspect, and a back-end load electrically connected to the relay control module.

[0033] The aforementioned relay control device for power battery charging control is electrically connected to the vehicle controller.

[0034] To better achieve the purpose of the invention, the present invention also provides a control method for a relay control module, the control method being used in a relay control module circuit, the relay control module comprising:

[0035] Relay circuit;

[0036] A relay control board is used to receive and process relay circuit signals according to control commands.

[0037] The relay circuit connected in series with the current sensor further includes a pre-charge relay circuit and a main relay circuit connected in parallel; wherein, the pre-charge relay circuit includes a pre-charge relay and a pre-charge resistor connected in series with the pre-charge relay, and the main relay circuit includes a main relay.

[0038] The control method includes the following steps:

[0039] The on / off state of the pre-charge relay is controlled according to the pre-charge time and the magnitude of the detected current, so that the current passing through the pre-charge resistor is kept within the limit.

[0040] The on / off state of the main relay is controlled according to the magnitude of the detected current, so that the main relay is cut off under the set current.

[0041] The control method of the aforementioned relay control module, further including the step of controlling the on / off state of the precharge relay based on the precharge time and the magnitude of the detected current, includes the following during normal precharge:

[0042] When the back-end load is in standby and without fault, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the pre-charge time T < t and the voltage difference U between the front and back ends of the relay circuit is detected to be < aV, the main relay is closed, and the pre-charge relay is opened after a delay time t1 to complete the pre-charge process. Here, t and aV are the set pre-charge time and the set voltage difference, respectively.

[0043] When the back-end load is in standby mode and without fault, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the pre-charge time T > t and the voltage difference U between the front and back ends of the relay circuit is detected to be greater than aV, the pre-charge relay is opened and the main relay is not closed, and a pre-charge fault is reported.

[0044] Furthermore, the step of controlling the on / off state of the precharge relay based on the precharge time and the magnitude of the detected current also includes the following during the precharge process:

[0045] When the back-end load is working or malfunctions, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the current sensor detects a current value I < b1, if the pre-charge time T < t and the voltage difference U between the front and back ends of the relay circuit is detected to be U < aV, the main relay is closed, and the pre-charge relay is opened after a delay of t1 to complete the pre-charge process. Here, b1 is the set pre-charge current value.

[0046] When the back-end load is working or malfunctions, the pre-charge relay is closed before the main relay is closed to perform pre-charge. When the current sensor detects a current value I < b1, if the pre-charge time T > t and the voltage difference U between the front and back ends of the relay circuit is detected to be greater than aV, the pre-charge relay is opened and the main relay is not closed, and a pre-charge fault is reported.

[0047] When the back-end load is working or malfunctions, if the current sensor detects a current value I > b1, the pre-charge relay will be disconnected and the main relay will not be closed, thus reporting a pre-charge fault.

[0048] The control method of the above-mentioned relay control module, wherein the step of controlling the on / off state of the main relay based on the magnitude of the detected current, further includes:

[0049] When the back-end load or battery is working normally and the main relay is powered off, after the current sensor detects a current value I < b2, the relay control board issues a main relay disconnect command to control the main relay to cut off, where b2 is the set disconnect current value;

[0050] When a fault occurs at the back-end load or battery end, after the current sensor detects a current value I < b2, the relay control board issues a main relay disconnect command to control the main relay to cut off.

[0051] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0052] In this embodiment, on the one hand, the relay control board controls the on / off state of the pre-charge relay based on the pre-charge time and the magnitude of the detected current, ensuring that the current passing through the pre-charge resistor remains within a limit, effectively guaranteeing the normal working state of the pre-charge resistor and preventing malfunctions such as burn-out. On the other hand, the relay control board controls the on / off state of the main relay based on the magnitude of the detected current, effectively ensuring that the main relay cuts off at a suitable current, avoiding arcing or even sticking faults caused by cutting off at a large current, and effectively improving the service life of the main relay. Attached Figure Description

[0053] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0054] Figure 1 This is a schematic diagram of an existing relay control device.

[0055] Figure 2 This is a schematic diagram of the structure of a relay control module according to an embodiment of this application;

[0056] Figure 3 This is a schematic diagram of a relay control board structure according to an embodiment of this application;

[0057] Figure 4 This is a schematic diagram of the control principle of a precharge relay circuit according to an embodiment of this application;

[0058] Figure 5 This is a schematic diagram of a relay control device for power battery charging control according to an embodiment of this application;

[0059] Figure 6 This is a schematic flowchart of a control method for a relay control module according to an embodiment of this application;

[0060] Figure 7 for Figure 6 A partial implementation flowchart of step S100;

[0061] Figure 8 for Figure 6 A schematic diagram of another part of the implementation process of step S100;

[0062] Figure 9 for Figure 6 A schematic diagram of the implementation process of step S200;

[0063] Figure label:

[0064] 100-Relay control module, 110-Relay circuit, 111-Pre-charge relay circuit, 112-Main relay circuit, 120-Relay control board, 121-Main control chip, 122-Drive unit, 123-Communication unit, 124-Power supply unit, 125-Detection unit, 130-Current sensor, 140-Circuit fuse;

[0065] 200 - Backend load;

[0066] 300 - Vehicle Controller. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0068] It should be noted that references to "an embodiment," "embodiment," "example embodiment," etc., in this specification refer to the described embodiment including specific features, structures, or characteristics, but not every embodiment must include these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0069] Furthermore, certain terms are used in the specification and subsequent claims to refer to specific components or parts. Those skilled in the art will understand that manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to." Additionally, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0070] refer to Figure 2 , Figure 2A schematic diagram of a relay control module structure according to an embodiment of this application is shown. The relay control module 100 includes a relay circuit 110 and a relay control board 120 electrically connected to the relay circuit 110. The relay control board 120 is used to receive and process signals from the relay circuit according to control commands. The relay circuit 110 further includes a pre-charge relay circuit 111 and a main relay circuit 112 connected in parallel. The parallel circuit is connected in series with a current sensor 130.

[0071] The precharge relay circuit 111 includes a precharge relay DK1 and a precharge resistor R connected in series with the precharge relay. The relay control board 120 controls the on / off state of the precharge relay DK1 according to the precharge time and the magnitude of the detected current, so that the current through the precharge resistor R is kept within the limit value, ensuring the normal working state of the precharge resistor.

[0072] The main relay circuit 112 includes a main relay DK2. The relay control board 20 controls the on / off state of the main relay DK2 according to the detected current, so that the main relay DK2 is cut off under a set current, avoiding arcing and sticking of the main relay when cut off under a large current.

[0073] In its implementation, the relay control module 100 also includes multiple connecting leads, such as... Figure 2 As shown:

[0074] The front end and the rear end of the relay circuit 110 are respectively connected to the relay control board 120 through the first connecting lead L1 and the fourth connecting lead L4, for detecting the voltage difference between the front end and the rear end of the relay circuit 110.

[0075] The output signal of the precharge relay DK1 is transmitted to the relay control board 120 through the second connecting lead L2;

[0076] The output signal of the main relay DK2 is transmitted to the relay control board 120 through the third connecting lead L3;

[0077] The current signal from the current sensor 130 is transmitted to the relay control board 120 via the fifth connection lead L5.

[0078] refer to Figure 3 , Figure 3A schematic diagram of a relay control board structure according to an embodiment of this application is shown. In some embodiments, the relay control board 120 may include a main control chip 121, and a drive unit 122, a communication unit 123, a power supply unit 124, and a detection unit 125, all electrically connected to the main control chip 121. The drive unit 122 is used to drive the pre-charge relay DK1 or the main relay DK2 to turn on or off; the communication unit 123 is used to communicate with an external controller; the power supply unit 124 is used to supply power to the relay control board 120; and the detection unit 125 is used to detect the voltage and / or current values ​​of the relay circuit.

[0079] refer to Figure 4 , Figure 4 The diagram illustrates the control principle of a precharge relay circuit according to an embodiment of this application. In some embodiments, the detection unit 125 may include a voltage detection unit and a current detection unit. The fourth connecting lead L4 is connected to the voltage detection unit, and the fifth connecting lead L5 is connected to the current detection unit. The main control chip 121 controls the operation of the precharge relay based on the voltage and / or current values ​​detected by the voltage detection unit and / or the current detection unit.

[0080] Based on the same control principle as the pre-charge relay circuit, in the main relay circuit control, the main control chip 121 controls the main relay to operate based on the current value detected by the current detection unit.

[0081] In some embodiments, the relay control module 100 further includes a circuit breaker 140, one end of which is connected to the current sensor 130 and the other end is connected to the downstream load, for protecting the relay control module.

[0082] In this embodiment, the relay control module 100, in its specific implementation, uses a relay control board 120 to control the on / off state of the precharge relay DK1 based on the precharge time and the magnitude of the detected current, including during normal precharge:

[0083] When the back-end load is in standby and without fault, before the main relay DK2 is closed, the pre-charge relay DK1 is closed to perform pre-charge. When the pre-charge time T < t and the voltage difference U between the front and back ends of the relay circuit is detected to be < aV, the main relay DK2 is closed, and the pre-charge relay DK1 is opened after a delay of t1 to complete the pre-charge process. Here, t and aV are the set pre-charge time and the set voltage difference, respectively.

[0084] In practical implementation, the set value of the voltage difference aV is determined according to the relay properties, and the set value of the precharge time t can be calculated based on the resistance characteristics, that is:

[0085] t=RC*Ln[(V bat -V0) / (V bat-V pre (1)

[0086] In the formula, t represents the pre-charging time, R represents the pre-charging resistance, C represents the load capacitance, and V bat V represents the battery pack voltage, V0 represents the voltage before the high voltage is closed at the load terminal (which can be represented as 0), V pre This indicates the load terminal voltage at the end of the pre-charge. Generally, V pre The total voltage V can be selected. bat 90% or 95%, in this embodiment, 90% is chosen, so formula (1) can be simplified: t = RC * Ln10.

[0087] When the back-end load is in standby mode and without fault, the pre-charge relay DK1 is closed before the main relay DK2 is closed to perform pre-charge. When the pre-charge time T > t and the voltage difference U between the front and back ends of the relay circuit is detected to be greater than aV, the pre-charge relay DK1 is opened and the main relay DK2 is not closed, and a pre-charge fault is reported.

[0088] Furthermore, this also includes the pre-charging process:

[0089] When the back-end load is working or malfunctioning, before the main relay DK2 is closed, the pre-charge relay DK1 is closed first for pre-charge. When the current sensor detects a current value I < b1, if the pre-charge time T < t and the voltage difference U between the front and back ends of the relay circuit is detected to be U < aV, then the main relay DK2 is closed, and the pre-charge relay DK1 is opened after a delay of t1 to complete the pre-charge process. Here, b1 is the set pre-charge current value, which is determined according to the pre-charge resistor parameter and is the maximum current allowed to pass through the pre-charge resistor.

[0090] When the back-end load is working or malfunctions, the pre-charge relay DK1 is closed before the main relay DK2 is closed to perform pre-charge. When the current sensor detects a current value I < b1, if the pre-charge time T > t and the voltage difference U between the front and back ends of the relay circuit is detected to be greater than aV, the pre-charge relay DK1 is opened and the main relay DK2 is not closed, and a pre-charge fault is reported.

[0091] When the back-end load is working or malfunctions, if the current sensor detects a current value I > b1, the pre-charge relay DK1 will be disconnected, and the main relay DK2 will not be closed, thus reporting a pre-charge fault.

[0092] The control method for the pre-charging process of the above-mentioned relay control module is shown in Table 1 below:

[0093] Table 1 Control methods for the pre-charging process of the relay control module

[0094]

[0095] Furthermore, the aforementioned relay control module 100 and relay control board 120 control the on / off state of the main relay DK2 based on the detected current magnitude, including:

[0096] When the back-end load or battery is working normally and the main relay DK2 is powered off, wait for the vehicle current to drop until the current sensor detects a current value I < b2. Then, the relay control board 120 issues a disconnect command to the main relay DK2 to control the main relay to cut off. Here, b2 is the set disconnect current value, which is set according to the main relay parameters.

[0097] When a fault occurs in the back-end load or battery, the external controller issues a control command to disconnect the main relay DK2. At this time, a large current flows through the main relay circuit, and the relay control module cannot issue a disconnect command for the main relay DK2 until the current sensor detects a current value I < b2. Then, the relay control board issues a disconnect command for the main relay DK2 to control the main relay to disconnect.

[0098] The relay control module in this embodiment uses a relay control board to control the relays. Compared with the existing vehicle controller controlling the relays, it reduces the complex wiring network, optimizes the structural design, and solves the problems of easy burnout of the pre-charge resistor and easy sticking of the main relay contacts in the existing relay control.

[0099] Based on the relay control module in the above embodiments, this application also provides a relay control device for power battery charging control. In some embodiments, such as Figure 5 As shown, the control device includes a relay control module 100 and a back-end load 200 electrically connected to the relay control module 100. The relay control device is also connected to the vehicle controller 300 via a CAN bus to receive and execute control commands sent by the vehicle controller.

[0100] refer to Figure 6 , Figure 6 A schematic flowchart of a control method for a relay control module according to an embodiment of this application is shown. The control method described below can be referred to in conjunction with the control module described above. The control method is used in a relay control module circuit, and the relay control module includes:

[0101] Relay circuit;

[0102] A relay control board is used to receive and process relay circuit signals according to control commands.

[0103] The relay circuit connected in series with the current sensor further includes a pre-charge relay circuit and a main relay circuit connected in parallel; wherein, the pre-charge relay circuit includes a pre-charge relay and a pre-charge resistor connected in series with the pre-charge relay, and the main relay circuit includes a main relay.

[0104] The control method includes the following steps:

[0105] S100. Control the on / off state of the pre-charge relay according to the pre-charge time and the magnitude of the detected current, so that the current passing through the pre-charge resistor remains within the limit.

[0106] S200. Control the on / off state of the main relay according to the magnitude of the detected current, so that the main relay is cut off under the set current.

[0107] In some implementations, such as Figure 7 As shown, in step S100, the on / off state of the precharge relay is controlled according to the precharge time and the magnitude of the detected current, including during normal precharge:

[0108] S111. When the back-end load is in standby mode and has no fault, the pre-charge relay DK1 is closed first to perform pre-charge before the main relay DK2 is closed.

[0109] S112. Determine whether the pre-charge time T < t and whether the voltage difference U < aV between the front and rear ends of the relay circuit is detected.

[0110] S113. If so, close the main relay DK2 and then open the precharge relay DK1 after a delay of t1 to complete the precharge process. Here, t and aV are the set precharge time and the set voltage difference, respectively.

[0111] S114. If not, continue to determine whether the pre-charge time T > t and whether the voltage difference U > aV between the front and rear ends of the relay circuit is detected.

[0112] S115. If so, disconnect the precharge relay DK1 and do not close the main relay DK2, and report a precharge fault.

[0113] S116. If not, the main relay DK2 and the precharge relay DK1 will not operate.

[0114] In some implementations, such as Figure 8 As shown, step S100, which controls the on / off state of the pre-charge relay based on the pre-charge time and the magnitude of the detected current, also includes the following during the pre-charge process:

[0115] S121. When the back-end load is working or malfunctions, the pre-charge relay DK1 shall be closed for pre-charge before the main relay DK2 is closed.

[0116] S122. Determine whether the current value I detected by the current sensor is less than b1.

[0117] S123. If not, disconnect the precharge relay DK1 and do not close the main relay DK2, and report a precharge fault.

[0118] S124. If so, determine whether the pre-charge time T < t and whether the voltage difference U < aV between the front and rear ends of the relay circuit is detected.

[0119] S125. If so, close the main relay DK2 and then open the precharge relay DK1 after a delay of t1 to complete the precharge process. Here, b1 is the set precharge current value, which is determined according to the precharge resistor parameter and is the maximum current allowed to pass through the precharge resistor.

[0120] S126. If not, determine whether the pre-charge time T > t and whether the voltage difference U > aV between the front and rear ends of the relay circuit is detected.

[0121] S127. If so, disconnect the precharge relay DK1 and do not close the main relay DK2, and report a precharge fault.

[0122] S128. If not, the main relay DK2 and the precharge relay DK1 will not operate.

[0123] In some implementations, such as Figure 9 As shown, step S200, which controls the on / off state of the main relay based on the magnitude of the detected current, includes:

[0124] S210. When the back-end load or battery is working normally and the main relay DK2 is powered off, or when the back-end load or battery fails, wait for the current value I to drop.

[0125] S220. Determine whether the current value I detected by the current sensor is less than b2, where b2 is the set breaking current value, which is set according to the main relay parameters.

[0126] S230. If so, the relay control board issues a disconnect command to the main relay DK2, controlling the main relay DK2 to disconnect.

[0127] S240. If not, the main relay DK2 will not be disconnected temporarily.

[0128] For details regarding the specific implementation structure and technical effects of the control method in this embodiment, please refer to the description of the corresponding part of the relay control module provided in the above embodiments, which will not be repeated here.

[0129] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device, or fabricating them separately as individual integrated circuit modules, or fabricating multiple modules or steps as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0130] Although this application has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.

Claims

1. A relay control module, comprising: a relay circuit; a relay control board for receiving and processing signals of the relay circuit according to control instructions; characterized in that the relay circuit in series with a current sensor further comprises a pre-charge relay circuit and a main relay circuit connected in parallel; wherein, the pre-charge relay circuit further comprises a pre-charge relay and a pre-charge resistor in series with the pre-charge relay, and the relay control board controls the on-off of the pre-charge relay according to the pre-charge time and the detected current, so that the current through the pre-charge resistor is kept within a limit; the main relay circuit further comprises a main relay, and the relay control board controls the on-off of the main relay according to the detected current, so that the main relay is cut off at a set current; the relay control board controls the on-off of the pre-charge relay according to the pre-charge time and the detected current, and further comprises: in normal pre-charge: when the back-end load is standby and no fault occurs, the pre-charge relay is closed to pre-charge before the main relay is closed, and when the pre-charge time T < t and the voltage difference U < aV between the front and back ends of the relay circuit is detected, the main relay is closed and the pre-charge relay is disconnected after a delay time t1, completing the pre-charge process, wherein t and aV are the set pre-charge time and the set voltage difference, respectively; when the back-end load is standby and no fault occurs, the pre-charge relay is closed to pre-charge before the main relay is closed, and when the pre-charge time T > t and the voltage difference U > aV between the front and back ends of the relay circuit is detected, the pre-charge relay is disconnected and the main relay is not closed, reporting a pre-charge fault; or in pre-charge process: when the back-end load is working or a fault occurs, the pre-charge relay is closed to pre-charge before the main relay is closed, and when the current sensor detects a current value I < b1, if the pre-charge time T < t and the voltage difference U < aV between the front and back ends of the relay circuit is detected, the main relay is closed and the pre-charge relay is disconnected after a delay time t1, completing the pre-charge process, wherein b1 is the set pre-charge current value; when the back-end load is working or a fault occurs, the pre-charge relay is closed to pre-charge before the main relay is closed, and when the current sensor detects a current value I < b1, if the pre-charge time T > t and the voltage difference U > aV between the front and back ends of the relay circuit is detected, the pre-charge relay is disconnected and the main relay is not closed, reporting a pre-charge fault; when the back-end load is working or a fault occurs, if the current sensor detects a current value I > b1, the pre-charge relay is disconnected and the main relay is not closed, reporting a pre-charge fault.

2. The relay control module of claim 1, wherein, further comprising a plurality of connection leads; the front and back ends of the relay circuit are connected to the relay control board through first and fourth connection leads, respectively, for detecting the voltage difference between the front and back ends of the relay circuit; the output signal of the pre-charge relay is transmitted to the relay control board through a second connection lead; The output signal of the main relay is transmitted to the relay control board through a third connecting lead; The current signal of the current sensor is transmitted to the relay control board through a fifth connecting lead.

3. The relay control module of claim 2, wherein, The relay control board comprises a main control chip, and a driving unit, a communication unit, a power supply unit and a detection unit electrically connected to the main control chip respectively.

4. The relay control module of claim 3, wherein, The detection unit comprises a voltage detection unit and a current detection unit, the fourth connecting lead is connected to the voltage detection unit, the fifth connecting lead is connected to the current detection unit, and the main control chip controls the action of the pre-charging relay based on the voltage value and / or the current value detected by the voltage detection unit and / or the current detection unit.

5. The relay control module of claim 3, wherein, The detection unit comprises a voltage detection unit and a current detection unit, the fifth connecting lead is connected to the current detection unit, and the main control chip controls the action of the main relay based on the current value detected by the current detection unit.

6. The relay control module of claim 1, wherein, A loop fuse is further included, one end of the loop fuse is connected to the current sensor, and the other end is connected to the rear-end load.

7. The relay control module of claim 1, wherein, The relay control board controls the on-off of the main relay according to the detected current size, and further comprises: When the rear-end load or the battery end is normally working and the main relay is powered off, after the current sensor detects that the current value I < b2, the relay control board issues a main relay disconnect instruction to control the main relay to be cut off, wherein b2 is a set breaking current value; When the rear-end load or the battery end fails, after the current sensor detects that the current value I < b2, the relay control board issues a main relay disconnect instruction to control the main relay to be cut off.

8. A relay control device for power battery charge control, characterized by, The control device comprises the relay control module of any one of claims 1 to 7, and a rear-end load electrically connected to the relay control module.

9. The relay control device for power cell charge control according to claim 8, characterized by, The relay control device is electrically connected to the vehicle controller.

10. A control method of a relay control module, characterized by, The control method is used in the relay control module circuit, and the relay control module comprises: a relay circuit; a relay control board for receiving and processing the relay circuit signal according to the control instruction; The relay circuit connected in series with the current sensor further comprises a pre-charging relay circuit and a main relay circuit connected in parallel; wherein the pre-charging relay circuit further comprises a pre-charging relay and a pre-charging resistor connected in series with the pre-charging relay, and the main relay circuit further comprises a main relay; The control method comprises the following steps: controlling the on-off of the pre-charging relay according to the pre-charging time length and the detected current size, so that the current passing through the pre-charging resistor is kept within the limit; controlling the on-off of the main relay according to the detected current size, so that the main relay is cut off at a set current; The step of controlling the on-off of the pre-charging relay according to the pre-charging time length and the detected current size further comprises: In normal pre-charging: when the back-end load is standby and no fault, the pre-charging relay is closed before the main relay is closed for pre-charging, when the pre-charging time T < t and the voltage difference U < aV between the front and back of the relay circuit is detected, the main relay is closed and the pre-charging relay is disconnected after the delay time t1, the pre-charging process is completed, wherein t and aV are the set pre-charging time and the set voltage difference respectively; when the back-end load is standby and no fault, the pre-charging relay is closed before the main relay is closed for pre-charging, when the pre-charging time T > t and the voltage difference U > aV between the front and back of the relay circuit is detected, the pre-charging relay is disconnected and the main relay is not closed, pre-charging fault is reported; or In pre-charging process: when the back-end load is working or has a fault, the pre-charging relay is closed before the main relay is closed for pre-charging, when the current sensor detects the current value I < b1, if the pre-charging time T < t and the voltage difference U < aV between the front and back of the relay circuit is detected, the main relay is closed and the pre-charging relay is disconnected after the delay time t1, the pre-charging process is completed, wherein b1 is the set pre-charging current value; when the back-end load is working or has a fault, the pre-charging relay is closed before the main relay is closed for pre-charging, when the current sensor detects the current value I < b1, if the pre-charging time T > t and the voltage difference U > aV between the front and back of the relay circuit is detected, the pre-charging relay is disconnected and the main relay is not closed, pre-charging fault is reported; when the back-end load is working or has a fault, if the current sensor detects the current value I > b1, the pre-charging relay is disconnected and the main relay is not closed, pre-charging fault is reported.

11. The control method of the relay control module according to claim 10, characterized by, The step of controlling the main relay according to the detected current value further comprises: When the back-end load or the battery end is normally working and the main relay is powered off, after the current sensor detects the current value I < b2, the relay control board sends a main relay disconnection instruction to control the main relay to be cut off, wherein b2 is the set breaking current value; When the back-end load or the battery end has a fault, after the current sensor detects the current value I < b2, the relay control board sends a main relay disconnection instruction to control the main relay to be cut off.

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