CN220904703U - Battery high-voltage system and electric device - Google Patents
Battery high-voltage system and electric device Download PDFInfo
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- CN220904703U CN220904703U CN202322543596.7U CN202322543596U CN220904703U CN 220904703 U CN220904703 U CN 220904703U CN 202322543596 U CN202322543596 U CN 202322543596U CN 220904703 U CN220904703 U CN 220904703U
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Abstract
The present disclosure relates to the field of vehicles, and in particular, to a battery high voltage system and an electric device. The battery high voltage system includes: the high-voltage battery pack comprises a first battery pack, a voltage division contactor and a second battery pack which are sequentially connected in series, wherein the positive electrode of the first battery pack is the positive electrode of the high-voltage battery pack, the negative electrode of the second battery pack is the negative electrode of the high-voltage battery pack, and the voltage which can be provided by the second battery pack is not more than a voltage threshold value; the positive electrode of the high-voltage battery pack is connected with the first end of the load through the main positive contactor; the negative electrode of the high-voltage battery pack is connected with the second end of the load, and a main negative contactor is not arranged between the negative electrode of the high-voltage battery pack and the load; and the BMS battery system is connected with the voltage division contactor and the main positive contactor and is used for controlling the opening and closing of the voltage division contactor and the main positive contactor. Therefore, the high-voltage battery pack safety can be improved while the high-voltage battery system is prevented from being complicated.
Description
Technical Field
The present disclosure relates to the field of vehicles, and in particular, to a battery high voltage system and an electric device.
Background
Currently, a battery high-voltage system on a vehicle generally includes a high-voltage battery pack, a main positive contactor, a main negative contactor, a BMS battery system, and a load. When encountering accidents such as collision and the like involving high-voltage safety, the BMS battery system can actively cut off the main positive contactor and the main negative contactor, so that electric shock caused by leading out of the high-voltage battery pack is avoided. However, due to the unexpected collision result, the high-voltage battery may still touch the ground of the vehicle body, resulting in high-voltage electric shock.
Disclosure of utility model
An object of the present disclosure is to provide a battery high voltage system and an electric device to improve the safety of a high voltage battery pack.
To achieve the above object, a first aspect of the present disclosure provides a battery high voltage system, comprising:
The high-voltage battery pack comprises a first battery pack, a voltage dividing contactor and a second battery pack which are sequentially connected in series, wherein the positive electrode of the first battery pack is the positive electrode of the high-voltage battery pack, and the negative electrode of the second battery pack is the negative electrode of the high-voltage battery pack, and the voltage which can be provided by the second battery pack is not more than a voltage threshold value;
The positive electrode of the high-voltage battery pack is connected with the first end of the load through the main positive contactor; the negative electrode of the high-voltage battery pack is connected with the second end of the load, and a main negative contactor is not arranged between the negative electrode of the high-voltage battery pack and the load;
And the BMS battery system is connected with the voltage division contactor and the main positive contactor and is used for controlling the opening and closing of the voltage division contactor and the main positive contactor.
Optionally, the first battery pack includes a plurality of sub-battery packs connected in series and sub-contactors connected between adjacent sub-battery packs;
The BMS battery system is connected with each sub-contactor and is used for controlling the opening and closing of the sub-contactor.
Optionally, the battery high voltage system further comprises a pre-charge circuit connected in parallel with the main positive contactor.
Optionally, the precharge circuit includes a precharge contactor and a precharge resistor in series;
The BMS battery system is connected with the pre-charging contactor and used for controlling the opening and closing of the pre-charging contactor.
Optionally, the battery high voltage system further comprises a current detection device,
The current detection device is connected with the negative electrode of the second battery pack, the second terminal and the BMS battery system.
Optionally, the battery high voltage system further comprises a heating circuit connected in parallel with the high voltage battery pack, the heating circuit comprising a heating contactor and a heater connected in series;
the BMS battery system is connected with the heating contactor and used for controlling the opening and closing of the heating contactor.
Alternatively, the BMS battery system includes a switch controller and a fault detection assembly;
the switch controller is connected with the voltage division contactor and the main positive contactor;
The fault detection assembly is connected with the switch controller and used for detecting the fault of the electric equipment, and when the fault of the electric equipment is a preset fault, the switch controller is used for controlling the voltage division contactor to be disconnected, and then the main positive contactor is controlled to be disconnected.
A second aspect of the present disclosure provides an electrically powered device comprising:
and the battery high-voltage system is provided in the first aspect of the disclosure.
Optionally, the electrically powered device further comprises:
and the information prompt part is connected with the BMS battery system and is used for prompting when the battery high-voltage system fails.
In the technical scheme, the high-voltage battery pack comprises a first battery pack voltage division contactor and a second battery pack which are connected in series, wherein the positive electrode of the first battery pack is the positive electrode of the high-voltage battery pack, the negative electrode of the second battery pack is the negative electrode of the high-voltage battery pack, and the voltage which can be provided by the second battery pack is not more than a voltage threshold value; the positive electrode of the high-voltage battery pack is connected with the first end of the load through a main positive contactor, the negative electrode of the high-voltage battery pack is connected with the second end of the load, and no main negative contactor is arranged between the negative electrode of the high-voltage battery pack and the load; the BMS battery system is connected with the high-voltage battery pack and connected with the voltage division contactor and the main positive contactor. So, compare in the current common battery high voltage system, cancelled main negative contactor, increased the partial pressure contactor between first group battery, second group battery, and the voltage of second group battery is not greater than voltage threshold value to can improve the security of high-voltage battery package when avoiding high-voltage battery system complicacy, even meet the electric equipment collision, battery leakage scheduling problem, also can reduce the risk of high-voltage electric shock through the division of group battery.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
Fig. 1 is a schematic diagram of a battery high voltage system provided by an exemplary embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a battery high voltage system provided by an exemplary embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a battery high voltage system provided by an exemplary embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a battery high voltage system provided by an exemplary embodiment of the present disclosure.
Description of the reference numerals
10. A high voltage battery pack; 11. a first battery pack; 12. a second battery pack; 13. a load; 14. a BMS battery system; 15. a current detection device; 16. a heater; 111. a first sub-battery pack; 112. a second sub-battery pack; 113. a third sub-battery pack;
KM1, a partial pressure contactor; KM2, primary positive contactor; KM3, pre-charging the contactor; KM4, a heating contactor; r1, pre-charging a resistor; KM10, first subcontactor; KM11, second subcontactor.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Fig. 1 is a schematic diagram of a battery high voltage system provided by an exemplary embodiment of the present disclosure. As shown in fig. 1, the battery high-voltage system includes a high-voltage battery pack 10, a main positive contactor KM2, a load 13, and a BMS battery system 14, wherein the high-voltage battery pack 10 includes a first battery pack 11, a voltage dividing contactor KM1, and a second battery pack 12, which are sequentially connected in series.
The positive electrode of the first battery pack 11 is the positive electrode of the high-voltage battery pack 10, and the negative electrode of the second battery pack 12 is the negative electrode of the high-voltage battery pack 10, wherein the voltage that the second battery pack 12 can provide is not greater than the voltage threshold.
The positive electrode of the high-voltage battery pack 10 is connected with the first end of the load 13 through the main positive contactor KM 2; the negative pole of the high-voltage battery pack 10 is connected with the second end of the load 13, and no main negative contactor exists between the negative pole of the high-voltage battery pack 10 and the load 13.
For example, the high-voltage battery pack 10 may include a plurality of single batteries, and the plurality of single batteries may be connected in series to supply power to the load 13, and a voltage dividing contactor KM1 may be added between two adjacent single batteries to divide the plurality of single batteries into the first battery pack 11 and the second battery pack 12. The specific location of the voltage dividing contactor KM1 may be determined based on a preset voltage threshold, which may be set based on a safety standard, for example, may be set to 60v. Assuming that 60 batteries are provided in the high-voltage battery pack 10, each battery can provide 3v voltage, the 1 st to 41 st batteries can be used as the first battery pack 11, the 42 th to 60 th batteries can be used as the second battery pack 12, that is, a voltage division contactor KM1 is added between the 41 st and 42 th batteries.
In the planar direction shown in fig. 1, the first end of the load 13 is an upper end, and the second end of the load 13 is a lower end. The positive pole of the high-voltage battery pack 10 is connected with the first end of the load 13 through the main positive contactor KM2, and the positive pole of the first battery pack 11 is connected with the first end of the load 13 through the main positive contactor KM 2; the negative electrode of the high-voltage battery pack 10 is connected to the second end of the load 13, which corresponds to the negative electrode of the second battery pack 12 being connected to the second end of the load 13. One end of the voltage dividing contactor KM1 is connected to the negative electrode of the first battery 11, and the other end of the voltage dividing contactor KM1 is connected to the positive electrode of the second battery 12.
The BMS battery system 14 is connected to the partial pressure contactor KM1 and the main positive contactor KM2, and is configured to control the opening and closing of the partial pressure contactor KM1 and the main positive contactor KM 2.
For example, the BMS battery system 14 may control the connection and disconnection of the voltage dividing contactor KM1 and the main positive contactor KM2 according to the received contactor control command issued by the external electric device. Or the BMS battery system 14 may be connected in parallel with the high-voltage battery pack 10 to automatically detect whether there is a fault in the high-voltage battery system, so as to control the connection and disconnection of the voltage division contactor KM1 and the main positive contactor KM 2. If the BMS battery system 14 determines that there is a fault in the battery high voltage system, the voltage dividing contactor KM1 and the main positive contactor KM2 may be controlled to be opened to stop supplying the power to the load 13. The high-voltage battery pack 10 is divided into two different battery packs, and the voltage of the individual battery packs is low with respect to the voltage of the high-voltage battery pack 10 as a whole. In this way, even if any one of the battery packs 10 of the high-voltage battery pack 10 contacts the vehicle body ground due to the impact of the electric device (e.g., vehicle), the risk of high-voltage electric shock can be reduced. If the single-cell thermal runaway of the battery causes arcing between adjacent cells, the BMS battery system 14 can determine that the battery high-voltage system has a fault, and the risk caused by heat diffusion can be reduced by controlling the voltage division contactor KM1 to be opened. Because the voltage that the second battery pack 12 can provide is low, the safety of the high-voltage battery pack 10 can be ensured even if the main negative contactor in the currently common battery high-voltage system is eliminated. It can be seen that, in the high-voltage battery system provided in this embodiment, the safety of the system can still be ensured when the main negative contactor is omitted, and in addition, the external voltage of the high-voltage battery pack 10 can be reduced if necessary, so that the safety of the system is further improved; in addition, when the battery in the first battery pack 11 or the second battery pack 12 fails, the risk of failure diffusion can be reduced by opening the partial pressure contactor KM1, thereby further improving the safety of the battery system.
In the above technical solution, the high-voltage battery pack 10 includes a first battery pack 11 voltage division contactor KM1 and a second battery pack 12 connected in series, wherein the positive electrode of the first battery pack 11 is the positive electrode of the high-voltage battery pack 10, the negative electrode of the second battery pack 12 is the negative electrode of the high-voltage battery pack 10, and the voltage that the second battery pack 12 can provide is not greater than the voltage threshold; the positive electrode of the high-voltage battery pack 10 is connected with the first end of the load 13 through a main positive contactor KM2, the negative electrode of the high-voltage battery pack 10 is connected with the second end of the load 13, and no main negative contactor is arranged between the negative electrode of the high-voltage battery pack 10 and the load 13; the BMS battery system 14 is connected to the high-voltage battery pack 10, and is connected to the partial pressure contactor KM1 and the main positive contactor KM 2. So, compare in the current common battery high voltage system, the main negative contactor has been cancelled, increased partial pressure contactor KM1 between first group battery 11, second group battery 12, and the voltage of second group battery 12 is not greater than voltage threshold value, thereby can improve the security of high voltage battery package 10 when avoiding high voltage battery system complicacy, even meet the problem such as electronic equipment collision, battery electric leakage, also can reduce the risk of high voltage electric shock through the division of group battery.
In an alternative embodiment, the first battery pack 11 may include a plurality of sub-battery packs connected in series and sub-contactors connected between adjacent sub-battery packs; the BMS battery system 14 is connected to each sub-contactor for controlling the opening and closing of the sub-contactor.
As shown in fig. 2, the first battery pack 11 may include a first sub-battery pack 111, a first sub-contactor KM10, a second sub-battery pack 112, a second sub-contactor KM11, and a third sub-battery pack 113, which are sequentially connected in series. In this manner, the BMS battery system 14 may control the voltage dividing contactor KM1 and the respective sub-contactors in the high-voltage battery pack 10 to be opened when it is determined that there is a fault in the battery high-voltage system. By providing a plurality of sub-contactors, the safety of the high-voltage battery pack 10 can be further improved.
In an alternative embodiment, the battery high voltage system may further comprise a pre-charge circuit connected in parallel with the main positive contact KM 2.
As shown in fig. 3, the precharge circuit may include a precharge contactor KM3 and a precharge resistor R1 connected in series; the BMS battery system 14 is connected to the pre-charge contactor KM3 for controlling the opening and closing of the pre-charge contactor KM 3.
For example, at high voltage on the vehicle, the BMS battery system 14 may control the partial pressure contactor KM1 to be closed, then control the pre-charge contactor KM3 to be closed for pre-charging, control the main positive contactor KM2 to be closed after the pre-charging is completed, and control the pre-charge contactor KM3 to be opened for a preset time (e.g., 100 ms). Therefore, high-voltage impact can be avoided from damaging high-voltage parts, and the safety of a battery high-voltage system is improved.
In an alternative embodiment, as shown in fig. 3, the battery high voltage system may further include a current detection device 15, and the current detection device 15 is connected to the negative electrode of the second battery pack 12, the second terminal, and the BMS battery system 14.
In this manner, the current detection device 15 may transmit the acquired current value to the BMS battery system 14, so that the BMS battery system 14 can determine whether there is a fault in the battery high-voltage system according to the acquired current value.
In an alternative embodiment, as shown in fig. 4, the battery high voltage system may also include a heating circuit in parallel with the high voltage battery pack 10.
The heating circuit may include a heating contactor KM4 and a heater 16 in series; the BMS battery system 14 is connected to the heating contactor KM4 for controlling the opening and closing of the heating contactor KM 4.
In this way, in case that the environmental temperature is too low, the BMS battery system 14 may control the heating contactor KM4 to be closed so that the heater 16 operates, thereby raising the temperature of the battery high-voltage system and ensuring the normal use of the high-voltage battery pack 10.
In an alternative embodiment, the BMS battery system 14 may include a switch controller and a fault detection assembly; the switch controller is connected with the voltage division contactor KM1 and the main positive contactor KM 2; the fault detection assembly is connected with the switch controller and used for detecting the fault of the electric equipment, and when the fault of the electric equipment is a preset fault, the switch controller is used for controlling the voltage division contactor KM1 to be disconnected, and then the main positive contactor KM2 is controlled to be disconnected.
For example, the preset fault condition may include a severe fault such as thermal runaway, collision, severe overpressure, severe overtemperature, overdischarge, etc. If the fault of the electric equipment is a preset fault, the fault detection assembly can control the voltage division contactor KM1 to be disconnected firstly through the switch controller so as to ensure that the high-voltage loop is disconnected, and then control the main positive contactor KM2 to be disconnected. If the electric equipment fault is not the preset fault, namely the determined electric equipment fault is a general fault such as a general over-temperature fault, a general over-discharge fault, a general overvoltage fault, an insulation fault and the like, the fault detection assembly can control the main positive contactor KM2 to be disconnected firstly through the switch controller, and carry out adhesion detection on the main positive contactor KM2, and then control the voltage division contactor KM1 to be disconnected after the adhesion detection is completed.
Thus, when the fault of the electric equipment is serious, even if the main positive contactor KM2 has an adhesion problem when being disconnected, the high-voltage loop can be ensured to be disconnected by firstly cutting off the partial pressure contactor KM 1; when serious faults occur to part of the battery packs, the partial pressure contactor KM1 is disconnected in time, so that the risk of fault diffusion can be reduced as much as possible.
The present disclosure also provides an electrically powered device comprising a battery high voltage system, the battery high voltage system being the battery high voltage system described in any one of the embodiments above.
In an alternative embodiment, the electric device may further include an information prompt part connected to the BMS battery system 14 for prompting when the battery high voltage system fails.
Wherein the information prompt part may include at least one of an in-vehicle display screen and a speaker.
For example, the BMS battery system 14 may generate corresponding hint information based on a specific failure cause when it is determined that the battery high voltage system has failed. The BMS battery system 14 may transmit the hint information to the in-vehicle display to display the hint information through the in-vehicle display. The prompt information can be sent to the loudspeaker so as to carry out voice broadcasting on the prompt information through the loudspeaker, so that a user can know the faults of the battery high-voltage system in time, the user is reminded to maintain in time, and the use experience of the user is improved.
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 embodiments described above, 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 above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
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 high voltage system, comprising:
The high-voltage battery pack (10), wherein the high-voltage battery pack (10) comprises a first battery pack (11), a voltage dividing contactor (KM 1) and a second battery pack (12) which are sequentially connected in series, the positive electrode of the first battery pack (11) is the positive electrode of the high-voltage battery pack (10), and the negative electrode of the second battery pack (12) is the negative electrode of the high-voltage battery pack (10), wherein the voltage which can be provided by the second battery pack (12) is not more than a voltage threshold value;
A main positive contactor (KM 2), wherein the positive electrode of the high-voltage battery pack (10) is connected with the first end of a load (13) through the main positive contactor (KM 2); the negative electrode of the high-voltage battery pack (10) is connected with the second end of the load (13), and a main negative contactor is not arranged between the negative electrode of the high-voltage battery pack (10) and the load (13);
and the BMS battery system (14) is connected with the partial pressure contactor (KM 1) and the main positive contactor (KM 2) and is used for controlling the opening and closing of the partial pressure contactor (KM 1) and the main positive contactor (KM 2).
2. The battery high-voltage system according to claim 1, wherein the first battery pack (11) includes a plurality of sub-battery packs connected in series and sub-contactors connected between adjacent sub-battery packs;
The BMS battery system (14) is connected with each sub-contactor and is used for controlling the opening and closing of the sub-contactor.
3. The battery high voltage system according to claim 1, further comprising a pre-charge circuit connected in parallel with the main positive contactor (KM 2).
4. A battery high voltage system according to claim 3, wherein the pre-charge circuit comprises a pre-charge contactor (KM 3) and a pre-charge resistor (R1) in series;
The BMS battery system (14) is connected with the pre-charging contactor (KM 3) and used for controlling the opening and closing of the pre-charging contactor (KM 3).
5. The battery high voltage system according to claim 1, further comprising a current detection device (15),
The current detection device (15) is connected to the negative electrode of the second battery pack (12), the second terminal, and the BMS battery system (14).
6. The battery high voltage system according to claim 1, further comprising a heating circuit in parallel with the high voltage battery pack (10), the heating circuit comprising a heating contactor (KM 4) and a heater (16) in series;
The BMS battery system (14) is connected with the heating contactor (KM 4) and used for controlling the opening and closing of the heating contactor (KM 4).
7. The battery high-voltage system according to claim 1, wherein the BMS battery system (14) includes a switch controller and a fault detection assembly;
the switch controller is connected with the voltage division contactor (KM 1) and the main positive contactor (KM 2);
The fault detection assembly is connected with the switch controller and used for detecting the fault of the electric equipment, and when the fault of the electric equipment is a preset fault, the switch controller is used for controlling the disconnection of the voltage division contactor (KM 1) and then controlling the disconnection of the main positive contactor (KM 2).
8. An electrically powered device, the electrically powered device comprising:
a battery high voltage system according to any one of claims 1 to 7.
9. The electrically powered device of claim 8, further comprising:
and the information prompt part is connected with the BMS battery system (14) and is used for prompting when the battery high-voltage system fails.
10. The electrically powered device of claim 9, wherein the information prompt includes at least one of a display screen and a speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322543596.7U CN220904703U (en) | 2023-09-18 | 2023-09-18 | Battery high-voltage system and electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322543596.7U CN220904703U (en) | 2023-09-18 | 2023-09-18 | Battery high-voltage system and electric device |
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| Publication Number | Publication Date |
|---|---|
| CN220904703U true CN220904703U (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322543596.7U Active CN220904703U (en) | 2023-09-18 | 2023-09-18 | Battery high-voltage system and electric device |
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| CN (1) | CN220904703U (en) |
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2023
- 2023-09-18 CN CN202322543596.7U patent/CN220904703U/en active Active
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