CN219172224U - Battery self-heating circuit, battery management system and vehicle - Google Patents
Battery self-heating circuit, battery management system and vehicle Download PDFInfo
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- CN219172224U CN219172224U CN202222438987.8U CN202222438987U CN219172224U CN 219172224 U CN219172224 U CN 219172224U CN 202222438987 U CN202222438987 U CN 202222438987U CN 219172224 U CN219172224 U CN 219172224U
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Abstract
The present disclosure relates to a battery self-heating circuit, a battery management system, and a vehicle, the circuit including a bus, a neutral line, a first power battery, a second power battery, a first contactor, a second contactor, a first capacitor, a second capacitor, and a voltage detection module; the first power battery is connected with the second power battery in series, the positive electrode of the first power battery is connected with a positive bus of the bus, and the negative electrode of the second power battery is connected with a negative bus of the bus; the first end of the first contactor is connected with the negative electrode of the first power battery and the positive electrode of the second power battery, the second end of the first contactor is connected with the first end of the second contactor, and the second end of the second contactor is connected with the negative electrode of the second power battery through a second capacitor and is connected with the positive electrode of the first power battery through a first capacitor; the neutral wire is connected with the second end of the first contactor and the first end of the second contactor; the voltage detection module detects voltage change between the neutral line and the bus to determine whether sintering of the first contactor and/or the second contactor occurs.
Description
Technical Field
The disclosure relates to the technical field of batteries, in particular to a battery self-heating circuit, a battery management system and a vehicle.
Background
Contact sintering refers to contact sintering of a contactor, namely contact adhesion, bonding and bonding, which is generally bonding caused by overlarge current and unreliable quality of a main contact, and leads to insufficient release of a coil after actuation when power failure, and contact bonding still cannot be reset. At present, a mechanical lock structure is often adopted to carry out sintering judgment of the contactor, so that the cost is higher, on the other hand, along with the increase of the service life, the corrosion of the mechanical structure is aggravated, the probability of misjudgment is gradually increased, and the accuracy is lower.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a battery self-heating circuit, a battery management system, and a vehicle.
According to a first aspect of embodiments of the present disclosure, there is provided a battery self-heating circuit, comprising:
the device comprises a bus, a neutral line, a first power battery, a second power battery, a first contactor, a second contactor, a first capacitor, a second capacitor and a voltage detection module, wherein the bus comprises an anode bus and a cathode bus;
the first power battery is connected with the second power battery in series, the positive electrode of the first power battery is connected with the positive electrode bus, and the negative electrode of the second power battery is connected with the negative electrode bus;
the first end of the first contactor is connected with the negative electrode of the first power battery and the positive electrode of the second power battery, the second end of the first contactor is connected with the first end of the second contactor, and the second end of the second contactor is connected with the negative electrode of the second power battery through the second capacitor and the positive electrode of the first power battery through the first capacitor;
the neutral wire connects the second end of the first contactor and the first end of the second contactor;
the voltage detection module is used for detecting voltage change between the neutral line and the bus, and the voltage change is used for determining whether the first contactor and/or the second contactor are sintered.
Optionally, the voltage detection module is connected with the neutral line and the positive bus, the battery self-heating circuit further comprises a first controller and a pre-charging contactor, the first controller is connected with the first contactor, the second contactor and the pre-charging contactor, and the first controller is used for controlling the switching states of the first contactor and the pre-charging contactor, so that the voltage detection module detects the voltage change between the neutral line and the positive bus.
Optionally, the voltage detection module is connected with the neutral line and the negative bus, the self-heating circuit of the battery further comprises a second controller, the second controller is connected with the first contactor and the second contactor, and the second controller is used for controlling the on-off state of the first contactor, so that the voltage detection module detects the voltage change between the neutral line and the negative bus.
Optionally, the device further comprises a judging module, wherein the judging module is connected with the voltage detecting module and is used for judging whether the first contactor and/or the second contactor are sintered according to the voltage change between the neutral line and the bus detected by the voltage detecting module.
Optionally, the device further comprises an alarm module, wherein the alarm module is connected with the judging module and is used for sending an alarm signal when the judging module judges that the first contactor and/or the second contactor are/is sintered.
Optionally, the vehicle control system further comprises a reporting module, wherein the reporting module is connected with the voltage detection module and the judging module and is used for reporting the voltage change between the neutral line and the bus detected by the voltage detection module and the judging result output by the judging module to the vehicle control system.
Optionally, the system further comprises a signal sending module, wherein the signal sending module is connected with the vehicle and the voltage detection module and is used for sending a voltage detection instruction to the voltage detection module when the vehicle is powered on and/or the vehicle is powered off.
Optionally, the first power battery and the second power battery are connected with the first controller and the second controller, and are used for supplying power to the first controller and the second controller.
According to a second aspect of embodiments of the present disclosure, there is provided a battery management system including the battery self-heating circuit of the first aspect.
According to a third aspect of embodiments of the present disclosure, there is provided a vehicle comprising the battery management system of the second aspect.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
by adopting the battery self-heating circuit, the voltage change between the neutral line and the bus is detected through the voltage detection module so as to determine whether the first contactor and/or the second contactor are sintered or not, the detection is finished based on the existing circuit topology and electronic devices, no new circuit is added, the reliability is high, and the detection cost is lower. Further, the voltage detection module is connected with the neutral line, the positive electrode bus and the negative electrode bus, multiple paths of detection can be adopted, and the obtained multiple voltage results can be mutually verified, so that the accuracy and reliability of sintering judgment of the contactor are improved.
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 disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram showing an auxiliary contact detecting contactor according to an exemplary embodiment.
Fig. 2 is a circuit diagram illustrating a battery self-heating circuit according to an exemplary embodiment.
Fig. 3 is a circuit diagram illustrating a battery self-heating circuit according to an exemplary embodiment.
Fig. 4 is a circuit diagram illustrating another battery self-heating circuit according to an exemplary embodiment.
Fig. 5 is a circuit diagram illustrating another battery self-heating circuit according to an exemplary embodiment.
Description of the reference numerals
A-busbar B-neutral line
A+ -positive bus A-negative bus
C1-first capacitor C2-second capacitor
1-first power cell 2-second power cell
3-Voltage detection Module 4-first contactor
5-second contactor 6-motor controller
7-motor 8-prefill contactor
9-decision Module 10-alarm Module
11-reporting module 12-signal transmitting module
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
In the prior art, a common contactor sintering detection method is to use a contactor with an auxiliary contact, wherein the auxiliary contact automatically detects the adhesion state of the contactor, as shown in fig. 1, along with the action of an intermediate connecting rod, the auxiliary contact and a main contact simultaneously act, and the adhesion condition of the main contact can be judged by detecting the on-off of the auxiliary contact. However, the mechanical lock structure needs to be added with an additional mechanical structure and a judging circuit for sintering judgment, so that the detection cost is high, and on the other hand, along with the increase of the service life, the corrosion of the mechanical structure is aggravated, and the misjudgment probability is gradually increased.
In view of the above, the present disclosure provides a battery self-heating circuit, a battery management system and a vehicle to solve the above technical problems.
Fig. 2 is a circuit diagram of a battery self-heating circuit according to an exemplary embodiment, and as shown in fig. 2, the battery self-heating circuit includes a bus bar a, a neutral line B, a first power battery 1, a second power battery 2, a first contactor 4, a second contactor 5, a first capacitor C1, a second capacitor C2, and a voltage detection module 3, where the bus bar includes a positive bus bar a+ and a negative bus bar a-;
illustratively, as shown in FIG. 2, the thick solid line is a busbar and the thick dashed line is a midline.
The first power battery 1 is connected with the second power battery 2 in series, the positive electrode of the first power battery 1 is connected with a positive electrode bus A+, and the negative electrode of the second power battery 2 is connected with a negative electrode bus A-;
the first end of the first contactor 4 is connected with the cathode of the first power battery 1 and the anode of the second power battery 2, the second end of the first contactor 4 is connected with the first end of the second contactor 5, and the second end of the second contactor 5 is connected with the cathode of the second power battery 2 through the second capacitor C2 and is connected with the anode of the first power battery 1 through the first capacitor C1;
the neutral line B connects the second end of the first contactor 4 and the first end of the second contactor 5;
the voltage detection module 3 is configured to detect a voltage change between the neutral line B and the bus a, and the voltage change is configured to determine whether the first contactor 4 and/or the second contactor 5 are sintered.
It should be understood at first that the present self-heating circuit also comprises a motor 7 and a motor controller 6,
it should be understood that the voltage detection module 3 may include two modules, a first voltage detection module 3 and a second voltage detection module 3, wherein the first voltage detection module 3 is connected to both the neutral line B and the positive bus a+ and the second voltage detection module 3 is connected to both the neutral line B and the negative bus a-. The voltage detection module 3 may also be a module that controls the voltage detection module 3 by controlling the on-off state of a first switch provided on the voltage detection module 3 and the positive bus a+ and a second switch provided on the voltage detection module 3 and the negative bus a-, to detect the voltage change between the neutral line B and the positive bus a+ and the voltage change between the neutral line B and the negative bus a-, respectively. The embodiments of the present disclosure are not limited in this regard.
By adopting the battery self-heating circuit, the voltage change between the neutral line B and the bus A is detected through the voltage detection module 3 so as to determine whether the first contactor 4 and/or the second contactor 5 are sintered or not, the detection is finished based on the existing circuit topology and electronic devices, no new circuit is added, the reliability is high, and the detection cost is lower. Further, the voltage detection module 3 is connected with the neutral line B, the positive electrode bus A+ and the negative electrode bus A-, multiple paths of detection can be adopted, and the obtained multiple voltage results can be mutually verified, so that the accuracy and reliability of sintering judgment of the contactor are improved.
In an embodiment, the voltage detection module 3 is connected to the neutral line B and the positive electrode bus a+, and the battery self-heating circuit further includes a first controller and a pre-charging contactor 8, the first controller is connected to the first contactor 4, the second contactor 5 and the pre-charging contactor 8, and the first controller is configured to control the on-off states of the first contactor 4 and the pre-charging contactor 8, so that the voltage detection module 3 detects a voltage change between the neutral line B and the positive electrode bus a+.
As shown in fig. 3, the voltage detection module 3 is connected to a point a on the positive bus a+ and to a point B on the neutral line B, and the first controller controls the first contactor 4 and the pre-charging contactor 8 to be closed, controls the voltage detection module 3 to perform voltage detection to obtain a first voltage, then controls the first contactor 4 to be opened, and controls the voltage detection module 3 to perform voltage detection again to obtain a second voltage.
In an embodiment, the voltage detection module 3 is connected to both the neutral line B and the negative bus a-, and the battery self-heating circuit further includes a second controller connected to both the first contactor 4 and the second contactor 5, and the second controller is configured to enable the voltage detection module 3 to detect a voltage change between the neutral line B and the negative bus a-by controlling the on-off state of the first contactor 4.
As shown in fig. 4, the voltage detection module 3 is connected to a point c on the negative bus a-and to a point B on the neutral line B, and the second controller controls the first contactor 4 and the pre-charging contactor 8 to be closed, controls the voltage detection module 3 to perform voltage detection to obtain a third voltage, then controls the first contactor 4 to be opened, and controls the voltage detection module 3 to perform voltage detection again to obtain a fourth voltage.
In an embodiment, the device further comprises a determining module 9, wherein the determining module 9 is connected with the voltage detecting module 3 and is used for determining whether the first contactor 4 and/or the second contactor 5 are sintered according to the voltage change between the neutral line B and the bus A detected by the voltage detecting module 3.
As illustrated in fig. 3, the first contactor 4 and the pre-charge contactor 8 are closed, and the first voltage measured between the positive bus line a+ and the neutral line B is the voltage of the first power battery 1. If the first contactor 4 is sintered, it means that the first contactor 4 cannot be in an open state (i.e., can be in a closed state), so that when the pre-charge contactor 8 is closed, the first contactor 4 is opened, and the first contactor 4 is sintered, the second voltage measured between the positive bus bar a+ and the neutral line B is equal to the first voltage. If the first contactor 4 is not sintered, it means that the first contactor 4 can be normally opened, so that the second voltage measured between the positive bus bar a+ and the neutral line B is smaller than the first voltage when the pre-charge contactor 8 is closed, the first contactor 4 is opened, and the first contactor 4 is not sintered.
For example, since the second contactor 5 is not controlled (i.e., is in a default open state) during the process of controlling the first contactor 4 and the pre-charge contactor 8 to be closed by the first controller and controlling the first contactor 4 to be opened again, if the second contactor 5 is sintered, it indicates that the second contactor 5 cannot be in an open state (i.e., can be in a closed state), so when the pre-charge contactor 8 is closed, the first contactor 4 is opened, and the first contactor 4 and the second contactor 5 are sintered, the second voltage between the positive bus a+ and the neutral line B is the voltage across the series line of the first power battery 1, the second power battery 2, and the second capacitor C2. If the second contactor 5 is not sintered, it means that the second contactor 5 is kept in an open state, and therefore, when the precharge contactor 8 is closed and the first contactor 4 is opened, and the first contactor 4 is sintered and the second contactor 5 is not sintered, a pressure measuring circuit for the power battery cannot be formed between the positive electrode bus line a+ and the neutral line B, and therefore, the rate of change between the first voltage and the second voltage is large.
Therefore, the determination module 9 determines that the first contactor 4 is sintered in the case where the second voltage is equal to the first voltage, and the determination module 9 determines that the first contactor 4 is not sintered in the case where the second voltage is smaller than the first voltage; in the case that the second voltage is smaller than the first voltage and the rate of change between the first voltage and the second voltage is larger than a first preset value, the determination module 9 determines that the second contactor 5 is not sintered; the determination module 9 determines that the second contactor 5 sinters when the rate of change between the first voltage and the second voltage is equal to or less than a first preset value.
As illustrated in fig. 4, the first contactor 4 is closed, and the third voltage measured between the negative bus line a-and the neutral line B is the voltage of the second power battery 2. If the first contactor 4 is sintered, it means that the first contactor 4 cannot be in an open state (i.e., can be in a closed state), so that the fourth voltage measured between the negative bus a-and the neutral line B is equal to the third voltage when the first contactor 4 is open and the first contactor 4 is sintered. If the first contactor 4 is not sintered, it means that the first contactor 4 can be normally opened, so that the fourth voltage measured between the negative bus a-and the neutral line B is smaller than the third voltage when the first contactor 4 is opened and the first contactor 4 is not sintered.
For example, since the second contactor 5 is not controlled (i.e., is in a default open state) during the process of controlling the first contactor 4 to be closed and controlling the first contactor 4 to be opened by the second controller, if the second contactor 5 is sintered, it indicates that the second contactor 5 cannot be in an open state (i.e., is in a closed state), so in the case that the first contactor 4 is opened and the first contactor 4 and the second contactor 5 are sintered, the measured fourth voltage between the negative bus a-and the neutral line B is the voltage across the series line of the first contactor 4, the second contactor 5, the second capacitor C2 and the second power battery 2. If the second contactor 5 is not sintered, it means that the second contactor 5 is kept in the open state, and therefore, when the first contactor 4 is open, and the first contactor 4 is sintered and the second contactor 5 is not sintered, a pressure measuring circuit for the power battery cannot be formed between the negative bus bar a-and the neutral line B, and therefore, the rate of change between the first voltage and the second voltage is large.
Therefore, the determination module 9 determines that the first contactor 4 is sintered in the case where the fourth voltage is equal to the third voltage, and the determination module 9 determines that the first contactor 4 is not sintered in the case where the fourth voltage is less than the third voltage; in the case that the fourth voltage is smaller than the third voltage and the rate of change between the third voltage and the fourth voltage is greater than the second preset value, the determination module 9 determines that the second contactor 5 is not sintered; the determination module 9 determines that the second contactor 5 sinters when the rate of change between the third voltage and the fourth voltage is equal to or less than a second preset value. The first preset value and the second preset value may be equal or unequal, which is not limited in the embodiment of the present disclosure.
It should be noted that, the determining module 9 obtains a first determining result according to the first voltage and the second voltage, and obtains a second determining result according to the third voltage and the fourth voltage. If the determination module 9 determines that the first contactor 4 is sintered and cannot be in the off state, it is impossible to determine whether the second contactor 5 is sintered according to the rate of change between the first voltage and the second voltage, the determination module 9 may sinter the first contactor 4, it is impossible to determine whether the second contactor 5 is sintered as the first determination result, and if it is impossible to determine whether the second contactor 5 is sintered according to the rate of change between the third voltage and the fourth voltage, the determination module 9 may sinter the first contactor 4, it is impossible to determine whether the second contactor 5 is sintered as the second determination result, which is not limited in the embodiment of the present disclosure.
In one embodiment, as shown in fig. 5, the self-heating circuit of the battery further comprises an alarm module 10, and the alarm module 10 is connected to the determination module 9 and is used for sending an alarm signal when the determination module 9 determines that the first contactor 4 and/or the second contactor 5 are sintered.
For example, the alarm module 10 may be a buzzer, and may send out a prompt sound when it is determined that the first contactor 4 and/or the second contactor 5 are sintered, or the alarm module 10 may be an alarm display lamp, and may be lit when it is determined that the first contactor 4 and/or the second contactor 5 are sintered, or may be other devices for prompting, which is not limited in the embodiment of the present disclosure.
In an embodiment, as shown in fig. 5, the battery self-heating circuit further includes a reporting module 11, where the reporting module 11 is connected to both the voltage detecting module 3 and the determining module 9, and is configured to report the voltage change between the detection center line B and the bus a detected by the voltage detecting module 3, and the determination result output by the determining module 9 to the control system of the vehicle.
For example, the information reported by the reporting module 11 may include a time for the voltage detection module 3 to detect the voltage between the neutral line B and the bus a, a voltage between the neutral line B and the bus a obtained by multiple measurements, a voltage change rate between the neutral line B and the bus a, a determination result obtained by the determining module 9 according to the voltage change between the neutral line B and the bus a, and the like, which is not limited in the embodiment of the present disclosure.
In an embodiment, as shown in fig. 5, the self-heating circuit of the battery further includes a signal sending module 12, where the signal sending module 12 is connected to both the vehicle and the voltage detecting module 3, and is configured to send a voltage detecting instruction to the voltage detecting module 3 when the vehicle is powered up and/or powered down.
It will be appreciated that the switching tubes in the motor controller 6 of the vehicle are in an open state both at the time of power up and power down of the vehicle, and thus a voltage detection command is sent to the voltage detection module 3 at the time of power up and/or power down of the vehicle, and the voltage detection module 3 detects the voltage between the bus a and the neutral line B in the self-heating circuit in this state. Of course, the signal sending module 12 may also send the voltage detection command when the other motor controller 6 is in the off state, which is not limited by the embodiment of the present disclosure.
In an embodiment, the first power battery 1 and the second power battery 2 are connected to both the first controller and the second controller for supplying power to both the first controller and the second controller.
The power supply devices of the first controller and the second controller may be the first power battery 1 and/or the second power battery 2, or may be other batteries or battery packs, for example, which is not limited by the embodiments of the present disclosure.
In an embodiment, the signal sending module 12 is further configured to, when the second determination result is inconsistent with the first determination result and the second determination result, control the first contactor 4 and the pre-charging contactor 8 to be closed again, control the voltage detecting module 3 to perform voltage detection, obtain a fifth voltage, control the first contactor 4 to be opened, and control the voltage detecting module 3 to perform voltage detection, obtain a sixth voltage.
The determining module 9 is connected to the voltage detecting module 3, and is configured to obtain a third determination result according to the fifth voltage and the sixth voltage detected by the voltage detecting module 3.
The disclosure also provides a battery management system comprising the battery self-heating circuit.
The disclosure also provides a vehicle comprising the battery management system.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A battery self-heating circuit, comprising:
the device comprises a bus, a neutral line, a first power battery, a second power battery, a first contactor, a second contactor, a first capacitor, a second capacitor and a voltage detection module, wherein the bus comprises an anode bus and a cathode bus;
the first power battery is connected with the second power battery in series, the positive electrode of the first power battery is connected with the positive electrode bus, and the negative electrode of the second power battery is connected with the negative electrode bus;
the first end of the first contactor is connected with the negative electrode of the first power battery and the positive electrode of the second power battery, the second end of the first contactor is connected with the first end of the second contactor, and the second end of the second contactor is connected with the negative electrode of the second power battery through the second capacitor and the positive electrode of the first power battery through the first capacitor;
the neutral wire connects the second end of the first contactor and the first end of the second contactor;
the voltage detection module is used for detecting voltage change between the neutral line and the bus, and the voltage change is used for determining whether the first contactor and/or the second contactor are sintered.
2. The battery self-heating circuit of claim 1, wherein the voltage detection module is connected to both the neutral line and the positive bus bar, the battery self-heating circuit further comprising a first controller and a pre-charge contactor, the first controller is connected to each of the first contactor, the second contactor, and the pre-charge contactor, the first controller is configured to detect a voltage change between the neutral line and the positive bus bar by controlling a switching state of the first contactor and the pre-charge contactor.
3. The battery self-heating circuit of claim 2, wherein the voltage detection module is connected to both the neutral line and the negative bus bar, the battery self-heating circuit further comprising a second controller connected to both the first contactor and the second contactor, the second controller configured to cause the voltage detection module to detect a voltage change between the neutral line and the negative bus bar by controlling a switching state of the first contactor.
4. The battery self-heating circuit according to claim 1, further comprising a determination module connected to the voltage detection module for determining whether the first contactor and/or the second contactor is sintered according to a voltage change between the neutral line and the bus bar detected by the voltage detection module.
5. The battery self-heating circuit of claim 4, further comprising an alarm module coupled to the determination module for signaling an alarm if the determination module determines that the first contactor and/or the second contactor are sintered.
6. The battery self-heating circuit according to claim 4, further comprising a reporting module, wherein the reporting module is connected to both the voltage detection module and the determination module, and is configured to report the voltage detection module detecting the voltage change between the neutral line and the bus and the determination result output by the determination module to a control system of the vehicle.
7. The battery self-heating circuit of claim 1, further comprising a signal transmission module connected to both the vehicle and the voltage detection module for transmitting a voltage detection command to the voltage detection module when the vehicle is powered up and/or when the vehicle is powered down.
8. The battery self-heating circuit of claim 3, wherein the first power battery and the second power battery are each coupled to the first controller and the second controller for powering the first controller and the second controller.
9. A battery management system comprising the battery self-heating circuit of any one of claims 1-8.
10. A vehicle comprising the battery management system of claim 9.
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| CN202222438987.8U CN219172224U (en) | 2022-09-14 | 2022-09-14 | Battery self-heating circuit, battery management system and vehicle |
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| CN202222438987.8U CN219172224U (en) | 2022-09-14 | 2022-09-14 | Battery self-heating circuit, battery management system and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024037112A1 (en) * | 2022-08-18 | 2024-02-22 | 比亚迪股份有限公司 | Battery self-heating device and vehicle with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024037112A1 (en) * | 2022-08-18 | 2024-02-22 | 比亚迪股份有限公司 | Battery self-heating device and vehicle with same |
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