CN217374170U - Detection circuit for battery negative-electrode-side relay, battery management system, and vehicle - Google Patents

Detection circuit for battery negative-electrode-side relay, battery management system, and vehicle Download PDF

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CN217374170U
CN217374170U CN202221573944.4U CN202221573944U CN217374170U CN 217374170 U CN217374170 U CN 217374170U CN 202221573944 U CN202221573944 U CN 202221573944U CN 217374170 U CN217374170 U CN 217374170U
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negative
battery
voltage
side relay
positive
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朱治兵
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Xiaomi Automobile Technology Co Ltd
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Xiaomi Automobile Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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Abstract

The present disclosure relates to a detection circuit of a battery negative electrode side relay, a battery management system, and a vehicle. In the detection circuit, the positive pole of the battery is connected with the positive pole of the load connector, the negative pole of the battery is connected with the negative pole of the first negative pole side relay, the positive pole of the first negative pole side relay is connected with the first negative pole of the load connector, and a first connecting point on a first connecting line between the negative pole of the battery and the negative pole of the first negative pole side relay is grounded; the negative pole of voltage source is connected at first connecting point, and the positive pole of voltage source is connected with the positive pole of first controlled current source, and the second tie point on the second connecting wire between the positive pole of first negative pole side relay and the first negative pole of load connector is connected to the negative pole of first controlled current source, and first voltage detection point position sets up between the negative pole of second tie point and first controlled current source. Thus, it is possible to diagnose whether or not the first negative-side relay is stuck before the high-voltage power-up.

Description

Detection circuit for battery negative-electrode-side relay, battery management system, and vehicle
Technical Field
The disclosure relates to the technical field of relays, in particular to a detection circuit of a battery cathode side relay, a battery management system and a vehicle.
Background
The power battery is an important power source of the electric automobile, and the safety of the power battery is the first problem to be considered and solved in the development process of the electric automobile. In the related art, the high-voltage circuit in the battery pack is usually controlled to be on or off by opening and closing a relay. Therefore, whether the relay can be normally opened or closed is very important, and if the relay is not normally closed when the electric automobile is driven, the dynamic property of the whole automobile is influenced, and even the electric automobile cannot be normally driven; if the relay can not be normally disconnected, electric energy can be wasted, so that the detection of the opening and closing state of the relay is very important.
SUMMERY OF THE UTILITY MODEL
To overcome the problems in the related art, the present disclosure provides a detection circuit of a battery negative-side relay, a battery management system, and a vehicle.
According to a first aspect of the embodiments of the present disclosure, there is provided a detection circuit of a battery negative-side relay, the detection circuit including a battery power supply loop and a detection branch;
the battery power supply loop comprises a battery, a load connector and a first negative side relay, wherein the positive electrode of the battery is connected with the positive electrode of the load connector, the negative electrode of the battery is connected with the negative electrode of the first negative side relay, the positive electrode of the first negative side relay is connected with the first negative electrode of the load connector, and a first connecting point on a first connecting line between the negative electrode of the battery and the negative electrode of the first negative side relay is grounded;
the detection branch comprises a voltage source, a first controlled current source and a first voltage detection point, wherein the negative electrode of the voltage source is connected to the first connection point, the positive electrode of the voltage source is connected with the positive electrode of the first controlled current source, the negative electrode of the first controlled current source is connected to a second connection point on a second connection line between the positive electrode of the first negative electrode side relay and the first negative electrode of the load connector, and the first voltage detection point is arranged between the second connection point and the negative electrode of the first controlled current source.
Optionally, the battery power supply circuit further includes a second negative side relay, a negative electrode of the second negative side relay is connected between the negative electrode of the voltage source and the first connection point, and a positive electrode of the second negative side relay is connected with a second negative electrode of the load connector;
the detection circuit further comprises a second controlled current source and a second voltage detection point, wherein the anode of the second controlled current source is connected with the anode of the voltage source and the anode of the first controlled current source, the cathode of the second controlled current source is connected with a third connection point on a third connection line between the anode of the second cathode side relay and the second cathode of the load connector, and the second voltage detection point is arranged between the third connection point and the cathode of the second controlled current source.
Optionally, the battery power supply circuit further includes a third negative side relay, a negative electrode of the third negative side relay is connected between the second voltage detection point and the third connection point, and a positive electrode of the third negative side relay is connected to a third negative electrode of the load connector;
the detection circuit further comprises a third controlled current source and a third voltage detection point, wherein the anode of the third controlled current source is connected with the anode of the voltage source, the anode of the first controlled current source and the anode of the second controlled current source, the cathode of the third controlled current source is connected with a fourth connection point on a fourth connection line between the anode of the third cathode-side relay and the third cathode of the load connector, and the third voltage detection point is arranged between the fourth connection point and the cathode of the third controlled current source.
Optionally, the battery power supply circuit further includes a main positive relay, a pre-charging resistor and a pre-charging relay, the positive electrode of the battery is connected to the positive electrode of the main positive relay, the negative electrode of the main positive relay is connected to the first positive electrode of the load connector, one end of the pre-charging resistor is connected between the positive electrode of the battery and the positive electrode of the main positive relay, the other end of the pre-charging resistor is connected to the positive electrode of the pre-charging relay, and the negative electrode of the pre-charging relay is connected to a fifth connection point on a fifth connection line between the negative electrode of the main positive relay and the first positive electrode of the load connector.
Optionally, the battery power supply circuit further comprises a first positive side relay, a positive electrode of the first positive side relay is connected between the fifth connection point and the first positive electrode of the load connector, and a negative electrode of the first positive side relay is connected to the second positive electrode of the load connector.
Optionally, the battery power supply circuit further includes a second positive-side relay, a positive electrode of the second positive-side relay is connected to a positive electrode of the battery, and a negative electrode of the second positive-side relay is connected to a third positive electrode of the load connector.
Optionally, the battery power supply circuit further includes a voltage reduction branch, the voltage reduction branch and the battery constitute the voltage source, wherein an input end of the voltage reduction branch is connected with the battery, and an output end of the voltage reduction branch represents an output end of the voltage source.
Optionally, the voltage source is a stand-alone voltage source isolated from the battery.
According to a second aspect of the embodiments of the present disclosure, there is provided a battery management system including the detection circuit provided in the first aspect of the present disclosure.
According to a third aspect of the embodiments of the present disclosure, there is provided a vehicle including the detection circuit provided by the first aspect of the present disclosure.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the detection circuit comprises a battery power supply loop and a detection branch. The battery power supply loop comprises a battery, a load connector and a first negative pole side relay, wherein the positive pole of the battery is connected with the positive pole of the load connector, the negative pole of the battery is connected with the negative pole of the first negative pole side relay, the positive pole of the first negative pole side relay is connected with the first negative pole of the load connector, and a first connecting point on a first connecting line between the negative pole of the battery and the negative pole of the first negative pole side relay is grounded. The detection branch comprises a voltage source, a first controlled current source and a first voltage detection point position, the negative pole of the voltage source is connected to a first connecting point, the positive pole of the voltage source is connected with the positive pole of the first controlled current source, the negative pole of the first controlled current source is connected to a second connecting point on a second connecting line between the positive pole of the first negative pole side relay and the first negative pole of the load connector, and the first voltage detection point position is arranged between the second connecting point and the negative pole of the first controlled current source. Therefore, before high-voltage electrification, the voltage of the outer side (namely, a first voltage detection point position) of the first cathode side relay can be pulled up through a voltage source based on a high-voltage ground and a first controlled current source, the voltage of the outer side of the first cathode side relay is collected, and whether the first cathode side relay is adhered or not can be diagnosed according to a voltage difference value by comparing the voltages of the inner side and the outer side of a contact switch of the first cathode side relay (namely comparing the voltages of the anode side and the cathode side of the first cathode side relay). Because the negative pole of the first negative pole side relay is grounded, before high-voltage electrification, whether the first negative pole side relay is adhered or not can be diagnosed through the voltage of the first voltage detection point.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram illustrating a detection circuit of a battery negative side relay according to an exemplary embodiment.
Fig. 2 is a schematic diagram illustrating another detection circuit of a battery negative side relay according to an exemplary embodiment.
Fig. 3 is a schematic diagram illustrating another detection circuit of a battery negative side relay according to an exemplary embodiment.
Fig. 4 is a schematic diagram illustrating another detection circuit of a battery negative side relay according to an exemplary embodiment.
Fig. 5 is a schematic diagram illustrating another detection circuit of a battery negative side relay according to an exemplary embodiment.
Fig. 6 is a schematic diagram illustrating a battery management system according to an exemplary embodiment of the present disclosure.
FIG. 7 is a schematic illustration of a vehicle shown in accordance with an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
It should be noted that all actions of acquiring signals, information, voltage values or data in the present application are performed under the premise of complying with the corresponding data protection regulation policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.
Fig. 1 is a schematic diagram illustrating a detection circuit of a battery negative-electrode-side relay according to an exemplary embodiment, and as shown in fig. 1, the detection circuit 1000 of the battery negative-electrode-side relay (abbreviated as the detection circuit 1000 in the embodiments of the present disclosure) may be applied to a vehicle and may also be applied to a dc charging device, and the detection circuit 1000 may include:
a battery power supply circuit 1100 and a detection branch 1200; the battery power supply circuit 1100 includes a battery 1101, a load connector 1102, and a first negative side relay 1103, wherein a positive electrode of the battery 1101 is connected to a positive electrode a of the load connector 1102, and a negative electrode of the battery 1101 is connected to a negative electrode d of the first negative side relay 1103 2 Connected to the positive pole d of the first negative side relay 1103 1 First negative pole B of load connector 1102 1 Connected, battery 1101And the negative electrode d of the first negative electrode side relay 1103 2 A first connection point 1104 on a first connection line therebetween is grounded; the detection branch 1200 includes a voltage source 1201, a first controlled current source 1202, and a first voltage detection point 1203, wherein a cathode of the voltage source 1201 is connected to the first connection point 1104, an anode of the voltage source 1201 and an anode d of the first controlled current source 1202 1 Connected to the negative pole d of the first controlled current source 1202 2 Connected to the positive electrode d of the first negative side relay 1103 1 First negative pole B of load connector 1102 1 A second connection point 1105 on the second connection line therebetween, and a first voltage detection point 1203 is disposed between the second connection point 1105 and the negative pole d of the first controlled current source 1202 2 In the meantime.
Positive pole a of load connector 1102 refers to one end of load connector 1102 connected to the positive pole of battery 1101, and first negative pole B of load connector 1102 1 Refers to the end of load connector 1102 connected to the negative terminal of battery 1101. Similarly, the positive electrode d of the first negative side relay 1103 1 One end of the first negative side relay 1103 connected to the positive terminal of the battery 1101, and the negative terminal d of the first negative side relay 1103 2 The first negative side relay 1103 is connected to the negative side of the battery 1101.
Positive pole d of first controlled current source 1202 1 Means the end of the first controlled current source 1202 connected to the positive pole of the voltage source 1201, and the negative pole d of the first controlled current source 1202 2 Refers to the end of the first controlled current source 1202 connected to the negative terminal of the voltage source 1201.
In a scenario where the detection circuit 1000 is applied to a vehicle, the battery 1101 may refer to a power battery of a power automobile, or a high-voltage battery pack. When the detection circuit 1000 is applied to a field other than a vehicle, the battery 1101 may be a dc rechargeable battery (or a battery pack).
The controlled current source is also called a controlled current source, wherein the controlled source is also called a dependent source. Generally, the voltage or current of a branch is generally called a controlled source when controlled by other factors than the branch. A controlled current source, i.e. a controlled source whose current is controlled by other factors than the present branch. The first controlled current source 1202 may include electronic components such as resistors, switches, etc. For example, the first controlled current source 1202 may be a series circuit of a resistor and a switch of 3 megaohms.
The first negative side relay 1103 may be a relay on the negative side of the battery 1101 in the vehicle high-voltage circuit, and may be, for example, a main negative relay, a quick charge negative relay, or the like in the vehicle high-voltage circuit. It should be explained that the main negative relay refers to the main relay on the negative side in the high voltage system. The quick charge negative relay refers to a relay in a quick charge circuit on the negative electrode side in a high-voltage system.
In some embodiments, voltage source 1201 may be divided/reduced by battery 1101. In other embodiments, voltage source 1201 may be a separate voltage source that is separate from battery 1101 and isolated from battery 1101. The output voltage of the voltage source 1201 is preferably 0-60V (volts).
For example, assuming that the output voltage of the voltage source 1201 is 50V, the first controlled current source 1202 controls the voltage at the first voltage detection point 1203 to rise. In one case, when the voltage detected at the first voltage detection point 1203 is 50V, it can be determined that the voltage difference between both sides of the first negative side relay 1103 (i.e., the first connection point 1104 and the second connection point 1105/the first voltage detection point 1203) is 50V, and the first negative side relay 1103 is in a non-stuck (i.e., not closed) state. Alternatively, if the voltage detected at the first voltage detection point 1203 is 0V, it can be determined that the voltage difference between the two sides of the first negative side relay 1103 is 0V, and the first negative side relay 1103 is in the stuck (i.e., closed) state.
With the above detection circuit 1000, the detection circuit 1000 includes the battery power supply circuit 1100 and the detection branch 1200. The battery power supply circuit 1100 includes a battery 1101, a load connector 1102, and a first negative side relay 1103, wherein a positive terminal of the battery 1101 is connected to a positive terminal a of the load connector 1102, and a negative terminal of the battery 1101 is connected to a negative terminal d of the first negative side relay 1103 2 Connected to the positive pole d of the first negative side relay 1103 1 First negative pole B of load connector 1102 1 The negative electrode of the battery 1101 is connected to the negative electrode d of the first negative side relay 1103 2 The first connection point 1104 on the first connection line therebetween is grounded. The detection branch 1200 includes a voltage source 1201, a first controlled current source 1202, and a first voltage detection point 1203, wherein a cathode of the voltage source 1201 is connected to the first connection point 1104, an anode of the voltage source 1201 and an anode d of the first controlled current source 1202 1 Connected to the negative pole d of the first controlled current source 1202 2 Connected to the positive electrode d of the first negative electrode side relay 1103 1 First negative pole B of load connector 1102 1 A second connection point 1105 on the second connection line therebetween, and a first voltage detection point 1203 is disposed between the second connection point 1105 and the negative pole d of the first controlled current source 1202 2 In the meantime. In this way, before high voltage power-on, the voltage outside the first negative side relay 1103 can be pulled up (i.e. the voltage value is pulled up) by the voltage source 1201 based on the high voltage ground and the first controlled current source 1202, and the voltage at the first voltage detection point 1203 outside the first negative side relay 1103 is collected (e.g. collected by the battery management system BMS), and by comparing the voltages inside and outside the contact switch of the first negative side relay 1103 (i.e. comparing the voltages on the positive side and the negative side of the first negative side relay 1103), whether the first negative side relay 1103 is stuck can be diagnosed according to the voltage difference. Since the negative electrode of the first negative electrode side relay 1103 is grounded, before the high voltage is applied, whether the first negative electrode side relay 1103 is stuck or not can be diagnosed by the voltage of the first voltage detection point 1203.
Referring to fig. 2, the battery power supply circuit 1100 (not represented by the dashed box in fig. 2) further includes a second negative side relay 1106, a negative pole d of the second negative side relay 1106 2 A positive electrode d of a second negative-side relay 1106 connected between the negative electrode of the voltage source 1201 and the first connection point 1104 1 Second negative pole B of load connector 1102 2 Connecting; the detection branch 1200 further includes a second controlled current source 1204, a second voltage detection point 1205, and an anode d of the second controlled current source 1204 1 To the positive pole of the voltage source 1201 and to the positive pole d of the first controlled current source 1202 1 Connected, negative pole d of second controlled current source 1204 2 Connected to the positive electrode d of the second negative side relay 1106 1 Second negative pole B of load connector 1102 2 A third connection point 1107 on a third connection line therebetween, and a second voltage detection point 1205 is arranged between the third connection point 1107 and the cathode d of the second controlled current source 1204 2 In the meantime.
Note that the positive electrode d of the second negative-side relay 1106 is 1 One end of the second negative side relay 1106 connected to the positive electrode of the battery 1101, and the negative electrode d of the second negative side relay 1106 2 Is one end of the second negative side relay 1106 connected to the negative electrode of the battery 1101.
Similarly, the positive pole d of the second controlled current source 1204 1 The end of the second controlled current source 1204 connected to the positive pole of the voltage source 1201, and the negative pole d of the second controlled current source 1204 2 Refers to the end of the second controlled current source 1204 connected to the negative pole of the voltage source 1201.
As shown in fig. 2, before the high voltage power-on, the voltage source 1201 based on the high voltage ground and the second controlled current source 1204 may pull up the voltage outside the second negative side relay 1106 (e.g., the second voltage detection point 1205) (i.e., pull up the voltage value), collect the voltage at the second voltage detection point 1205 outside the second negative side relay 1106 (e.g., collect the voltage by the battery management system BMS), and diagnose whether the second negative side relay 1106 is stuck based on the difference between the voltage at the second voltage detection point 1205 and the voltage at the first connection point 1104. Illustratively, assuming that the output voltage of the voltage source 1201 is 50V, the second controlled current source 1204 controls the voltage at the second voltage detection point 1205 to rise. In one case, if the voltage detected at the second voltage detection point 1205 is 49V, it can be determined that the second negative side relay 1106 is in the non-stuck (i.e., non-closed) state. Alternatively, if the voltage detected at the second voltage detection point 1205 is 0V, it can be determined that the second negative side relay 1106 is in the stuck (i.e., closed) state. That is, the present disclosure determines whether the relay is stuck by determining whether a voltage difference between both sides of the relay is 0.
Referring to FIG. 3, a battery suppliesThe electrical circuit 1100 (not represented by the dashed box in fig. 3) further comprises a third negative side relay 1108, the negative pole d of the third negative side relay 1108 2 A positive electrode d of a third negative electrode side relay 1108 connected between the second voltage detection point 1205 and the third connection point 1107 1 Third negative pole B of load connector 1102 3 Connecting; the detection circuit 1200 (not shown by the dashed box in fig. 3) further includes a third controlled current source 1206, a third voltage detection point 1207, and an anode d of the third controlled current source 1206 1 And the positive pole of the voltage source 1201, the positive pole d of the first controlled current source 1202 1 And the positive pole d of the second controlled current source 1204 1 Negative pole d of third controlled current source 1206 2 Connected to the positive electrode d of the third negative electrode side relay 1108 1 Third negative pole B of load connector 1102 3 A fourth connection point 1109 on the fourth connection line therebetween, and a third voltage detecting point 1207 is disposed between the fourth connection point 1109 and the negative pole d of the third controlled current source 1206 2 In the meantime.
Note that the positive electrode d of the third negative-side relay 1108 1 One end of the third negative side relay 1108 connected to the positive electrode of the battery 1101, and the negative electrode d of the third negative side relay 1108 2 Refers to one end of the third negative side relay 1108 connected to the negative electrode of the battery 1101.
Similarly, the positive pole d of the third controlled current source 1206 1 The first controlled current source 1206 is connected to the positive terminal of the voltage source 1201, and the second controlled current source 1206 is connected to the negative terminal d 2 Is the end of the third controlled current source 1206 connected to the negative pole of the voltage source 1201.
As shown in fig. 3, before the high voltage power-on, the voltage source 1201 based on the high voltage ground and the third controlled current source 1206 may pull up the voltage at the outer side (e.g., the third voltage detection point 1207) of the third negative side relay 1108 (i.e., pull up the voltage value), collect the voltage at the third voltage detection point 1207 at the outer side of the third negative side relay 1108 (e.g., collect the voltage by the battery management system BMS), and determine whether the third negative side relay 1108 is stuck based on a difference between the voltage at the third voltage detection point 1207 and the voltage at the inner side (e.g., the second voltage detection point 1205 and the third connection point 1107) of the third negative side relay 1108. For example, assuming that the output voltage of the voltage source 1201 is 50V, the third controlled current source 1206 controls the voltage of the third voltage detecting point 1207 to be pulled high. In one case, if the voltage detected at the third voltage detection point 1207 is 40V and it is determined in advance that the second negative side relay 1106 is in the stuck state, it is determined that the third negative side relay 1108 is in the non-stuck (i.e., not closed) state. Alternatively, if the voltage detected at the third voltage detection point 1207 is 0V and it is determined in advance that the second negative side relay 1106 is in the stuck state, it may be determined that the third negative side relay 1108 is in the stuck (i.e., closed) state.
In other embodiments, whether the third negative side relay 1108 is in the stuck state may be determined according to the voltage values at the second voltage detection point 1205 and the third voltage detection point 1207. For example, assuming that the output voltage of the voltage source 1201 is 50V, the third controlled current source 1206 controls the voltage at the third voltage detection point 1207 to be pulled up to 45V, and the second controlled current source 1204 controls the voltage at the second voltage detection point 1205 to be pulled up to 50V. In one case, if the difference between the voltage detected at the third voltage detecting point 1207 and the voltage detected at the second voltage detecting point 1205 is 0, it indicates that the third negative side relay 1108 is in the stuck state. In another case, if the difference between the voltage detected at the third voltage detection point 1207 and the voltage detected at the second voltage detection point 1205 is 5V, it indicates that the third negative side relay 1108 is in the non-stuck state.
Referring to fig. 4, the battery power supply circuit 1100 may further include a main positive relay 1110, a pre-charging resistor 1111 and a pre-charging relay 1112, wherein the positive electrode of the battery 1101 and the positive electrode d of the main positive relay 1110 1 Negative pole d of main positive relay 1110 2 First positive pole A connected with load connector 1 One end of the precharge resistor 1111 is connected to the positive electrode of the battery 1101 and the positive electrode d of the main positive relay 1110 1 Between the other end of the precharge resistor 1111 and the positive electrode d of the precharge relay 1112 1 Connecting, pre-charging relayNegative electrode d of electric appliance 1112 2 Connected to the negative pole d of the main positive relay 1110 2 First positive pole A of load connector 1102 1 And a fifth connection point 1113 on a fifth connection line therebetween.
Note that the positive electrode d of the main positive relay 1110 1 One end of main positive relay 1110 connected to the positive electrode of battery 1101, and negative electrode d of main positive relay 1110 2 Which is one end of main positive relay 1110 connected to the negative electrode of battery 1101. Positive pole d of pre-charging relay 1112 1 One end of the pre-charge relay 1112 connected to the positive electrode of the battery 1101, and the negative electrode d of the pre-charge relay 1112 2 This indicates one end of the precharge relay 1112 connected to the negative electrode of the battery 1101.
In order to prevent the voltage difference between the battery 1101 and the load connected to the battery power supply circuit 1100 through the load connector 1102 from being too large, which may cause a large current to burn out the relay in the battery power supply circuit 1100, the pre-charge relay 1112 may be closed during the pre-charge phase during the power-up process of the battery power supply circuit 1100, so as to reduce the output current of the battery 1101 through the pre-charge resistor 1111 and the pre-charge relay 1112. When the load precharge voltage reaches 95% of the voltage of the battery 1101, the precharge is deemed successful, the main positive relay 1110 is closed, and then the precharge relay 1112 is opened, and the battery 1101 is in a dischargeable state.
Referring to fig. 5, the battery power supply circuit 1100 may further include a first positive-side relay 1114, a positive pole d of the first positive-side relay 1114 1 A first positive electrode A connected to the fifth connection point 1113 and the load connector 1102 1 Negative pole d of the first positive pole-side relay 1114 2 Connected to the second positive pole A of the load connector 1102 2 . The battery power supply circuit 1100 may further include a second positive-side relay 1115, and a positive electrode d of the second positive-side relay 1115 1 A negative electrode d of a second positive electrode side relay 1115 connected to a positive electrode of the battery 1101 2 Third positive pole A of load connector 1102 3 And (4) connecting.
The positive pole A of the load connector 1102 includes A 1 、A 2 、A 3 . Positive pole d of first positive pole side relay 1114 1 Is the first positive electrode side relayOne end of the electric appliance 1114 connected to the positive electrode of the battery 1101, and the negative electrode d of the first positive electrode-side relay 1114 2 The first positive electrode-side relay 1114 is connected to the negative electrode of the battery 1101. Positive electrode d of second positive electrode side relay 1115 1 One end of the second positive electrode-side relay 1115 connected to the positive electrode of the battery 1101, and the negative electrode d of the second positive electrode-side relay 1115 2 The one end of the second positive-side relay 1115 is connected to the negative electrode of the battery 1101.
The first positive electrode side relay 1114 may be a protection relay of a protection circuit or some electronic component, the second positive electrode side relay 1115 may be a fast charge relay, and the fast charge relay refers to a relay in a fast charge circuit on the positive electrode side in a high voltage system.
In some embodiments, the battery power supply circuit 1100 may further include a voltage reduction branch, where the voltage reduction branch and the battery 1101 form a voltage source 1201, where an input terminal of the voltage reduction branch is connected to the battery 1101, and an output terminal of the voltage reduction branch represents an output terminal of the voltage source 1201. That is, the voltage source 1201 may be divided/reduced by the battery 1101. The voltage reduction branch may be any DC-DC buck circuit in the related art, which is not described here.
In other embodiments, voltage source 1201 may be a separate voltage source isolated from battery 1101.
Fig. 6 is a schematic diagram illustrating a battery management system according to an exemplary embodiment of the present disclosure, and as shown in fig. 6, the battery management system 100 includes the detection circuit 1000 provided in any of the embodiments.
Fig. 7 is a schematic diagram of a vehicle according to an exemplary embodiment of the disclosure, and as shown in fig. 7, the vehicle 200 includes the detection circuit 1000 provided in any of the embodiments.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The detection circuit of the battery cathode side relay is characterized by comprising a battery power supply loop and a detection branch circuit;
the battery power supply loop comprises a battery, a load connector and a first negative side relay, wherein the positive electrode of the battery is connected with the positive electrode of the load connector, the negative electrode of the battery is connected with the negative electrode of the first negative side relay, the positive electrode of the first negative side relay is connected with the first negative electrode of the load connector, and a first connecting point on a first connecting line between the negative electrode of the battery and the negative electrode of the first negative side relay is grounded;
the detection branch comprises a voltage source, a first controlled current source and a first voltage detection point, wherein the negative electrode of the voltage source is connected to the first connection point, the positive electrode of the voltage source is connected with the positive electrode of the first controlled current source, the negative electrode of the first controlled current source is connected to a second connection point on a second connection line between the positive electrode of the first negative electrode side relay and the first negative electrode of the load connector, and the first voltage detection point is arranged between the second connection point and the negative electrode of the first controlled current source.
2. The detection circuit of claim 1, wherein the battery supply circuit further comprises a second negative side relay having a negative terminal connected between the negative terminal of the voltage source and the first connection point, and having a positive terminal connected to the second negative terminal of the load connector;
the detection circuit further comprises a second controlled current source and a second voltage detection point, wherein the anode of the second controlled current source is connected with the anode of the voltage source and the anode of the first controlled current source, the cathode of the second controlled current source is connected with a third connection point on a third connection line between the anode of the second cathode side relay and the second cathode of the load connector, and the second voltage detection point is arranged between the third connection point and the cathode of the second controlled current source.
3. The detection circuit of claim 2, wherein the battery supply circuit further comprises a third negative side relay, a negative terminal of the third negative side relay being connected between the second voltage detection point and the third connection point, and a positive terminal of the third negative side relay being connected to a third negative terminal of the load connector;
the detection circuit further comprises a third controlled current source and a third voltage detection point, wherein the anode of the third controlled current source is connected with the anode of the voltage source, the anode of the first controlled current source and the anode of the second controlled current source, the cathode of the third controlled current source is connected with a fourth connection point on a fourth connection line between the anode of the third cathode-side relay and the third cathode of the load connector, and the third voltage detection point is arranged between the fourth connection point and the cathode of the third controlled current source.
4. The detection circuit according to any one of claims 1 to 3, wherein the battery supply circuit further comprises a main positive relay, a pre-charge resistor, and a pre-charge relay, wherein the positive electrode of the battery is connected to the positive electrode of the main positive relay, the negative electrode of the main positive relay is connected to the first positive electrode of the load connector, one end of the pre-charge resistor is connected between the positive electrode of the battery and the positive electrode of the main positive relay, the other end of the pre-charge resistor is connected to the positive electrode of the pre-charge relay, and the negative electrode of the pre-charge relay is connected to a fifth connection point on a fifth connection line between the negative electrode of the main positive relay and the first positive electrode of the load connector.
5. The detection circuit of claim 4, wherein the battery supply circuit further comprises a first positive side relay, a positive pole of the first positive side relay being connected between the fifth connection point and the first positive pole of the load connector, and a negative pole of the first positive side relay being connected to the second positive pole of the load connector.
6. The detection circuit according to claim 4, wherein the battery supply circuit further comprises a second positive side relay, a positive electrode of the second positive side relay being connected to a positive electrode of the battery, and a negative electrode of the second positive side relay being connected to a third positive electrode of the load connector.
7. The detection circuit according to claim 1, wherein the battery supply circuit further comprises a voltage reduction branch, the voltage reduction branch and the battery forming the voltage source, wherein an input terminal of the voltage reduction branch is connected to the battery, and an output terminal of the voltage reduction branch represents an output terminal of the voltage source.
8. The detection circuit of claim 1, wherein the voltage source is a stand-alone voltage source isolated from the battery.
9. A battery management system comprising the detection circuit of any one of claims 1-8.
10. A vehicle, characterized in that it comprises a detection circuit according to any one of claims 1-8.
CN202221573944.4U 2022-06-21 2022-06-21 Detection circuit for battery negative-electrode-side relay, battery management system, and vehicle Active CN217374170U (en)

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CN202221573944.4U CN217374170U (en) 2022-06-21 2022-06-21 Detection circuit for battery negative-electrode-side relay, battery management system, and vehicle

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CN202221573944.4U CN217374170U (en) 2022-06-21 2022-06-21 Detection circuit for battery negative-electrode-side relay, battery management system, and vehicle

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