CN217135178U - Wake-up circuit of battery management system and battery management device - Google Patents
Wake-up circuit of battery management system and battery management device Download PDFInfo
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- CN217135178U CN217135178U CN202123448862.5U CN202123448862U CN217135178U CN 217135178 U CN217135178 U CN 217135178U CN 202123448862 U CN202123448862 U CN 202123448862U CN 217135178 U CN217135178 U CN 217135178U
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Abstract
The utility model discloses a battery management system's awakening circuit and battery management device. The wake-up circuit includes: the wake-up circuit is used for connecting with a battery management system and waking up the battery management system, and comprises: one end of the constant-power supply circuit is used for being connected with a constant-power port of the battery management system, and the other end of the constant-power supply circuit is connected with the positive electrode of a low-voltage power supply of the whole vehicle; one end of the switch circuit is connected with the positive pole of the low-voltage power supply of the whole vehicle, and the other end of the switch circuit is used for being electrically connected with the battery management system, so that the problems of low real-time performance and reliability of the battery management system in the related technology are solved.
Description
Technical Field
The utility model relates to a battery field particularly, relates to a battery management system's awakening circuit and battery management device.
Background
In the related art, with the issuance of carbon emission policies and the implementation of related laws in China, more and more pure electric or hybrid electric vehicles move into thousands of households. Under the development trend of long endurance and high energy density, the safety requirement of the electric automobile is higher and higher, particularly, a power battery is used as one of core components of the electric automobile, and the battery management technology is directly concerned about the safe use of the battery.
When the battery management system is in a dormant state, the battery management system has an automatic periodic awakening function, the temperature of the NTC temperature sensors at each point in the battery pack is detected after the battery management system is awakened, the battery management system carries out logic judgment on the temperature sensor data, whether the temperature meets a thermal runaway condition or not is identified, if the temperature meets the thermal runaway condition, a thermal runaway event is reported, and if the temperature does not meet the thermal runaway condition, the battery management system enters the dormant state again.
The prior art has the following disadvantages: 1) insufficient real-time performance: when the thermal runaway occurs in the dormancy period of the battery management system, the self-awakening period of the battery management system is not necessarily met, a thermal runaway event occurs before self-awakening, the battery management system is not awakened, and early temperature and voltage data of the thermal runaway cannot be timely collected. 2) The accuracy is insufficient: currently, the specific temperature is indirectly determined by detecting the resistance value of an NTC sensor of an electronic device; when misdetection is carried out, thermal runaway can be misreported, and the probability of misreport is high. 3) Extra electric power consumption: the battery management system needs to wake up periodically and frequently, which causes unnecessary power loss.
In view of the above problems in the related art, no effective solution has been proposed.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a wake-up circuit and a battery management device for a battery management system to solve the problems of real-time performance and low reliability of the battery management system in the related art.
In order to achieve the above object, according to one aspect of the present invention, a wake-up circuit of a battery management system is provided. The utility model discloses a include: the wake-up circuit is used for being connected with a battery management system and waking up the battery management system, and comprises: one end of the constant-power supply circuit is used for being connected with a constant-power port of the battery management system, and the other end of the constant-power supply circuit is connected with the positive electrode of a low-voltage power supply of the whole vehicle; and one end of the switching circuit is connected with the positive electrode of the low-voltage power supply of the whole vehicle, and the other end of the switching circuit is used for being electrically connected with the battery management system.
Furthermore, the switch circuit comprises a first diode and a thermosensitive switch group, one end of the first diode is connected with the anode of the low-voltage power supply of the whole vehicle, and the other end of the first diode is connected with the thermosensitive switch group.
Furthermore, the wake-up circuit further comprises a filter circuit, wherein one end of the filter circuit is connected with the switch circuit, and the other end of the filter circuit is electrically connected with an IO port of the battery management system.
Further, the constant-current power supply circuit includes: the battery management system comprises a first resistance unit, a second diode and a first capacitor, wherein one end of the first resistance unit is connected with the positive pole of a low-voltage power supply of the whole vehicle, the other end of the first resistance unit is connected with the positive pole of the second diode, the negative pole of the second diode is connected with one end of the second resistance unit, the other end of the second resistance unit is connected with a normal-electricity power supply port of the battery management system, a first connecting point exists between the first resistance unit and the second diode, the first connecting point is connected with one end of the first capacitor, and the other end of the first capacitor is grounded.
Furthermore, the anode of the first diode is connected with the anode of a low-voltage power supply of the whole vehicle, the cathode of the first diode is connected with a thermosensitive switch group, the thermosensitive switch group comprises a plurality of thermosensitive switches connected in parallel, and the thermosensitive switches are respectively arranged at positions corresponding to a plurality of temperature points of the battery pack.
Further, the wake-up circuit further comprises: and one end of the level detection circuit is grounded, the other end of the level detection circuit is connected with a second connection point, and the second connection point is connected with the thermosensitive switch group and the filter circuit.
Further, the level detection circuit comprises a third resistance unit, a fourth resistance unit, a voltage stabilizing diode and a level detection IO port, one end of the third resistance unit is connected with the second connection point, the other end of the third resistance unit is connected with one end of the fourth resistance unit, the other end of the fourth resistance unit is grounded, a third connection point exists between the third resistance unit and the fourth resistance unit, the third connection point is connected with the level detection IO port, the level detection IO port is further connected with the negative electrode of the voltage stabilizing diode, and the positive electrode of the voltage stabilizing diode is grounded.
Further, the filter circuit includes: one end of the fifth resistance unit is connected with the second connection point, the other end of the fifth resistance unit is connected with the anode of the third diode, the cathode of the third diode is connected with the awakening IO port of the battery management system, a fourth connection point exists between the fifth resistance unit and the third diode, the fourth connection point is connected with one end of the second capacitor, and the other end of the second capacitor is grounded.
Furthermore, the second connection point is also connected with the cathode of a fourth diode, and the anode of the fourth diode is connected with a starting switch of the whole vehicle.
The utility model also provides a battery management device, including battery management system and awakening circuit, battery management system is connected with awakening circuit electricity, and awakening circuit is used for awakening up battery management system.
Through the utility model discloses, adopt following step: the wake-up circuit is used for being connected with a battery management system and waking up the battery management system, and comprises: one end of the constant-power supply circuit is used for being connected with a constant-power port of the battery management system, and the other end of the constant-power supply circuit is connected with the positive electrode of a low-voltage power supply of the whole vehicle; one end of the switch circuit is connected with the anode of the whole vehicle low-voltage power supply, the other end of the switch circuit is connected with the filter circuit, the switch circuit comprises a first diode and a thermosensitive switch group, and the first diode is connected with the thermosensitive switch group; one end of the filter circuit is connected with the switch circuit, and the other end of the filter circuit is used for being connected with the awakening IO port of the battery management system, so that the problems of low real-time performance and reliability of the battery management system in the related technology are solved, and the effects of reducing the static power consumption of the battery management system and improving the reliability of the thermal runaway awakening are achieved.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a first schematic diagram of a wake-up circuit of a battery management system according to an embodiment of the present invention;
fig. 2 is a second schematic diagram of a wake-up circuit of a battery management system according to an embodiment of the present invention;
fig. 3 is a third schematic diagram of a wake-up circuit of a battery management system according to an embodiment of the present invention;
wherein the following reference numerals are included:
10, a battery management system; 20, a normal power supply circuit; 30, a switching circuit; 40, a filter circuit; 50, a level detection circuit; r1, a first resistance unit; r2, a second resistance unit; r3, a third resistance unit; r4, a fourth resistance unit; r5, a fifth resistance unit; d1, a first diode; d2, a second diode; VD, a voltage regulator diode; d3, a third diode; d4, a fourth diode; c1, a first capacitance; c2, a second capacitance; p1, a first connection point; p2, second connection point; p3, third connection point; p4, fourth connection point; TW, thermal switch; KL30, the positive electrode of the low-voltage power supply of the whole vehicle; KL31, the positive electrode of the low-voltage power supply of the whole vehicle; KL15, vehicle starting switch.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances for purposes of describing the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, wake-up circuit, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, wake-up circuit, article, or apparatus.
According to the utility model discloses an embodiment provides a battery management system's awakening circuit.
Fig. 1 is a first schematic diagram of a wake-up circuit of a battery management system according to an embodiment of the present invention, as shown in fig. 1, the present invention includes the following components: the wake-up circuit is used for connecting with the battery management system 10, and waking up the battery management system 10, and includes:
specifically, one end of the constant-power supply circuit 20 is used for being connected with a constant-power supply port of the battery management system, and the other end of the constant-power supply circuit is connected with the positive electrode of the low-voltage power supply of the whole vehicle;
specifically, one end of the switching circuit 30 is connected to the positive electrode of the low-voltage power supply of the entire vehicle, and the other end is used for being electrically connected to the battery management system 10.
The normal power supply circuit 20 and the switch circuit 30 are connected to form a wake-up circuit, and the wake-up circuit is used for waking up the battery management system.
In an alternative example, the switch circuit 30 includes a first diode D1 and a thermal switch set, one end of the first diode D1 is connected to the positive electrode of the low-voltage power supply of the whole vehicle, and the other end is connected to the thermal switch set.
In the above manner, the battery management system 10 is awakened by the thermal switch TW in the wake-up circuit, so that the static power consumption of the battery management system 10 is reduced, and the reliability of the thermal runaway wake-up is improved.
In an alternative example, the wake-up circuit further includes a filter circuit 40, and one end of the filter circuit 40 is connected to the switch circuit 30, and the other end is electrically connected to an IO port of the battery management system, as shown in fig. 2.
Specifically, the wake-up circuit provided by the present application is further provided with a filter circuit 40, as shown in fig. 2, one end of the filter circuit 40 is connected to the switch circuit 30, the other end is connected to an IO port of the battery management system, and the filter circuit 40 is configured to filter an alternating current in the circuit.
In an alternative embodiment, the constant current power supply circuit 20 includes: the battery management system comprises a first resistor unit R1, a second resistor unit R2, a second diode D2 and a first capacitor C1, wherein one end of the first resistor unit R1 is connected with the positive electrode of the low-voltage power supply of the whole vehicle, the other end of the first resistor unit R1 is connected with the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected with one end of the second resistor unit R2, the other end of the second resistor unit R2 is connected with the normal power supply port of the battery management system, a first connection point P1 is arranged between the second resistor unit R2 and the second diode D2, the first connection point P1 is connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded, which is specifically shown in fig. 3.
It should be noted that, the constant-power supply circuit supplies power to the battery management system no matter whether the battery management system is awakened or not, and meanwhile, the resistance unit in the present application may include one resistance or a plurality of resistances.
In an alternative example, the positive electrode of the first diode D1 is connected with the positive electrode of the low-voltage power supply of the whole vehicle, the negative electrode of the first diode D1 is connected with a thermal switch group, the thermal switch group comprises a plurality of thermal switches TW connected in parallel, and the plurality of thermal switches TW are respectively arranged at positions corresponding to a plurality of temperature points of the battery pack.
The thermal switch TW is a temperature-sensitive element, and can be automatically turned on and off according to a specified temperature without additional power supply, and one thermal switch is correspondingly disposed at each temperature monitoring point in the battery pack, and when the temperature of any one temperature monitoring point is greater than or equal to a threshold temperature, the corresponding thermal switch TW is turned on, so as to wake up the battery management system 10, and when the temperature of the temperature monitoring point is less than the threshold temperature, the corresponding thermal switch TW is turned off.
In an optional example, the wake-up circuit further comprises: the level detection circuit 50 has one end connected to ground and the other end connected to a second connection point P2, and the second connection point P2 is connected to the thermal switch set and the filter circuit 40, as shown in fig. 2.
As described above, in the present application, there may be a malfunction of the thermal switch TW, resulting in an abnormal wake-up of the battery management system 10, thereby resulting in false alarm thermal runaway. The battery management system 10 is awakened to start working, and the level detection circuit 50 continuously detects for a period of time to determine whether a continuous voltage exists at the point P3, for example, the voltage continuously detected at the point P3 within the time t1 is greater than or equal to U1, and then it is determined that thermal runaway occurs; if the voltage < U1 at the point P3 is not detected within the time t1, and the voltage < U1 at the point P3 is detected after the detection is continued for the time t2, it is determined that the thermo-sensitive switch TW malfunctions, and the sleep state is entered.
In an alternative example, the level detection circuit 50 includes a third resistor unit R3, a fourth resistor unit R4, a zener diode D3, and a level detection IO port, one end of the third resistor unit R3 is connected to the second connection point P2, the other end of the third resistor unit R3 is connected to one end of the fourth resistor unit R4, the other end of the fourth resistor unit R4 is grounded, a third connection point P3 exists between the third resistor unit R3 and the fourth resistor unit R4, the third IO connection point P3 is connected to the level detection port, the level detection IO port is further connected to a cathode of the zener diode D3, and an anode of the zener diode D3 is grounded.
In an alternative example, the filter circuit 40 includes: the battery management system comprises a fifth resistance unit R5, a third diode D3 and a second capacitor C2, wherein one end of the fifth resistance unit R5 is connected with a second connection point P2, the other end of the fifth resistance unit R5 is connected with the anode of a third diode D3, the cathode of the third diode D3 is connected with a wake-up IO port of the battery management system, a fourth connection point P4 exists between the fifth resistance unit R5 and the third diode D3, one end of the second capacitor C2 is connected to the fourth connection point P4, and the other end of the second capacitor C2 is grounded.
The dc component of the rectified output is filtered by the filter circuit 40 as described above.
In an alternative example, the second connection point P2 is further connected to a cathode of a fourth diode D4, and an anode of the fourth diode D4 is connected to a vehicle start switch.
In another alternative embodiment provided by the present application, as shown in fig. 2, fig. 2 is a schematic diagram two of a wake-up circuit of a battery management system according to an embodiment of the present invention, the wake-up circuit is located between the low-voltage power positive electrodes of a wake-up IO port of the battery management system, and a plurality of diodes and a plurality of parallel thermal switches TW are connected in sequence therebetween, wherein the plurality of parallel thermal switches TW form a thermal switch set, the thermal switch set is disposed at a temperature monitoring point of a battery pack, after the temperature of the temperature monitoring point is greater than or equal to a threshold temperature, a corresponding thermal switch TW is turned on, and further the battery management system 10 is woken up, and after the temperature of the temperature monitoring point is less than the threshold temperature, the corresponding thermal switch TW is turned off, wherein a connection point between the thermal switch set and the filter circuit 40 is further connected to a level detection circuit 50, and the level detection circuit 50 is used for waking up the battery management system 10, whether continuous voltage exists or not is detected for a period of time, misjudgment is prevented, no matter whether the battery management system 10 is awakened or not, the power needs to be supplied by the normal power supply circuit 20 all the time, and the normal power supply circuit 20 has the function of voltage stabilization.
The embodiment of the utility model provides a pair of battery management system's awakening circuit is used for being connected with battery management system 10 through awakening circuit for awaken up battery management system 10, include: one end of the normal power supply circuit 20 is used for being connected with a normal power supply port of the battery management system 10, and the other end of the normal power supply circuit is connected with the positive electrode of a low-voltage power supply of the whole vehicle; one end of the switch circuit 30 is connected with the anode of the low-voltage power supply of the whole vehicle, the other end of the switch circuit is connected with the filter circuit 40, the switch circuit 30 comprises a first diode D1 and a thermosensitive switch group, and the first diode D1 is connected with the thermosensitive switch group; one end of the filter circuit 40 is connected to the switch circuit 30, and the other end is used for being connected to the wake-up IO port of the battery management system, so that the problems of low real-time performance and reliability of the battery management system 10 in the related art are solved, and the effects of reducing the static power consumption of the battery management system 10 and improving the reliability of the thermal runaway wake-up are achieved.
The utility model also provides a battery management device, including battery management system and awakening circuit, battery management system is connected with awakening circuit electricity, and awakening circuit is used for awakening up battery management system.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, wake-up circuit, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, wake-up circuit, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the process, wake-up circuit, article of manufacture, or device in which the element is included.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a wake-up circuit, system or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present invention, and are not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. Wake-up circuit for a battery management system, the wake-up circuit being connected to a battery management system (10) for waking up the battery management system (10), comprising:
one end of the constant-power supply circuit (20) is used for being connected with a constant-power supply port of the battery management system, and the other end of the constant-power supply circuit is connected with the positive electrode of a low-voltage power supply of the whole vehicle;
and one end of the switch circuit (30) is connected with the positive pole of the low-voltage power supply of the whole vehicle, and the other end of the switch circuit is electrically connected with the battery management system (10).
2. The wake-up circuit according to claim 1, wherein the switch circuit comprises a first diode (D1) and a thermal switch group, one end of the first diode (D1) is connected with the positive electrode of the low-voltage power supply of the whole vehicle, and the other end of the first diode is connected with the thermal switch group.
3. Wake-up circuit according to claim 2, characterized in that it further comprises a filter circuit (40), one end of the filter circuit (40) being connected to the switching circuit and the other end being electrically connected to an IO port of the battery management system.
4. Wake-up circuit according to claim 1, characterized in that the normally-powered supply circuit (20) comprises:
first resistance element (R1), second resistance element (R2), second diode (D2) and first electric capacity (C1), the one end of first resistance element (R1) with whole car low voltage power supply positive pole is connected, the other end of first resistance element (R1) with the anodal of second diode (D2) is connected, the negative pole of second diode (D2) with the one end of second resistance element (R2) is connected, the other end of second resistance element (R2) with battery management system's normal electric power port is connected, second resistance element (R2) with there is first connecting point (P1) between second diode (D2), first connecting point (P1) is connected the one end of first electric capacity (C1), the other end ground connection of first electric capacity (C1).
5. The wake-up circuit according to claim 2, wherein an anode of the first diode (D1) is connected to a cathode of the low-voltage power supply of the whole vehicle, a cathode of the first diode (D1) is connected to the thermal switch group, the thermal switch group comprises a plurality of thermal switches (TW) connected in parallel, and the plurality of thermal switches (TW) are respectively disposed at positions corresponding to a plurality of temperature points of the battery pack.
6. The wake-up circuit of claim 3, wherein the wake-up circuit further comprises:
and a level detection circuit (50) having one end grounded and the other end connected to a second connection point (P2), wherein the second connection point (P2) is connected to the thermal switch group and the filter circuit (40).
7. Wake-up circuit according to claim 6, characterized in that the level detection circuit (50) comprises a third resistor unit (R3), a fourth resistor unit (R4), a zener diode (VD), and a level detection IO port, wherein one end of the third resistor unit (R3) is connected to the second connection point (P2), the other end of the third resistor unit (R3) is connected to one end of the fourth resistor unit (R4), the other end of the fourth resistor unit (R4) is connected to ground, a third connection point (P3) is present between the third resistor unit (R3) and the fourth resistor unit (R4), the third connection point (P3) is connected to the level detection IO port, the level detection IO port is further connected to the negative pole of the zener diode (VD), and the positive pole of the zener diode (VD) is connected to ground.
8. Wake-up circuit according to claim 6, characterized in that the filter circuit (40) comprises:
a fifth resistance unit (R5), a third diode (D3), and a second capacitor (C2), wherein one end of the fifth resistance unit (R5) is connected to the second connection point (P2), the other end of the fifth resistance unit (R5) is connected to the anode of the third diode (D3), the cathode of the third diode (D3) is connected to the wake-up IO port of the battery management system, a fourth connection point (P4) exists between the fifth resistance unit (R5) and the third diode (D3), the fourth connection point (P4) is connected to one end of the second capacitor (C2), and the other end of the second capacitor (C2) is grounded.
9. The wake-up circuit according to claim 8, characterized in that the second connection point (P2) is further connected with a cathode of a fourth diode (D4), and an anode of the fourth diode (D4) is connected with a vehicle start switch.
10. A battery management device comprising a battery management system and the wake-up circuit of any one of claims 1 to 9, wherein the battery management system is electrically connected to the wake-up circuit, and the wake-up circuit is configured to wake up the battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202123448862.5U CN217135178U (en) | 2021-12-31 | 2021-12-31 | Wake-up circuit of battery management system and battery management device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123448862.5U CN217135178U (en) | 2021-12-31 | 2021-12-31 | Wake-up circuit of battery management system and battery management device |
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| CN217135178U true CN217135178U (en) | 2022-08-05 |
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