CN214355543U - BDU high-pressure loop - Google Patents
BDU high-pressure loop Download PDFInfo
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- CN214355543U CN214355543U CN202021815042.8U CN202021815042U CN214355543U CN 214355543 U CN214355543 U CN 214355543U CN 202021815042 U CN202021815042 U CN 202021815042U CN 214355543 U CN214355543 U CN 214355543U
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Abstract
The utility model provides a BDU high pressure return circuit. The high-voltage loop is formed by connecting a quick charge negative relay, a main current sensor and a main negative relay in series, and connecting a quick charge positive relay, a main pre-charging loop and an auxiliary pre-charging loop in parallel; arranging an auxiliary current sensor in series with a main current sensor in a BDU high-voltage loop, and additionally arranging a detonation fuse in series with a fuse; the main pre-charging loop comprises a first pre-charging relay and a first pre-charging resistor, and the auxiliary pre-charging loop comprises a second pre-charging relay and a second pre-charging resistor; the detonation type fuse, the main current sensor, the auxiliary current sensor, the main positive relay and the main negative relay form a discharging loop in a series connection mode; the detonation type fuse, the main current sensor, the auxiliary current sensor, the quick charging positive relay, the quick charging negative relay and the main negative relay form a charging loop in a series connection mode. The utility model provides the high operational reliability of BDU high-pressure loop.
Description
Technical Field
The utility model relates to a battery power distribution technical field, especially a BDU high-voltage loop.
Background
When a battery system distribution Box (BDU) of an existing new energy automobile is designed at high voltage, only one current sensor, a main circuit fuse and a pre-charging circuit are arranged in a high-voltage circuit, and the following problems exist: firstly, when the current sensor reaches the end of the service life or fails and the current collection is inaccurate, the BMS system cannot detect the working state of the current sensor, so that the BMS has deviation in calculating the SOC and the remaining endurance mileage. Secondly, the fuse is an overcurrent protection device, and after a large current appears in a loop and lasts for a certain time, the melt of the fuse can be fused by overheating, so that the loop is disconnected. In the running process of a vehicle, the fuse can be impacted to a certain degree when the fuse is in overcurrent at each time, and the vehicle cannot run due to the fact that the running working condition of the vehicle is complex and the fuse is abnormally fused. And thirdly, in the process of pre-charging the battery system, if the pre-charging resistor fails, the vehicle cannot run. The quick charging capacity of the battery pack is stronger and stronger, and when the battery pack is quickly charged, the relay continues to have overlarge current, so that the relay is adhered and cannot be disconnected.
At present, the requirement for the operation reliability of a new energy automobile in the industry is higher and higher, however, when a certain electric device of the new energy automobile breaks down in a BDU (battery management unit) of a power lithium battery system, the automobile cannot operate, and the operation reliability of a BDU high-voltage loop is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a BDU high-pressure return circuit that operational reliability is high, when a certain electrical part breaks down, can guarantee that battery system can use.
Realize the utility model discloses the technical solution of purpose does: a BDU high-voltage loop is characterized in that a quick charge negative relay is connected with a main current sensor and a main negative relay in series, and a quick charge positive relay, a main pre-charging loop and an auxiliary pre-charging loop are connected in parallel;
an auxiliary current sensor is arranged at the positive end or the negative end of the BDU high-voltage loop and connected with a main current sensor in series, and a detonation fuse is additionally arranged at the positive end or the negative end and connected with a fuse in series.
Furthermore, the main pre-charging circuit comprises a first pre-charging relay and a first pre-charging resistor which are arranged in series, and the auxiliary pre-charging circuit comprises a second pre-charging relay and a second pre-charging resistor which are arranged in series.
Further, the detonation fuse, the main current sensor, the auxiliary current sensor, the main positive relay and the main negative relay form a discharging loop in a series connection mode;
during discharging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main positive relay, the main negative relay and the main pre-charging loop all participate in working, and if the main pre-charging loop fails, the auxiliary pre-charging loop participates in working.
Furthermore, the detonation fuse, the main current sensor, the auxiliary current sensor, the quick charge positive relay, the quick charge negative relay and the main negative relay form a charging loop in a series connection mode;
during charging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main negative relay, the quick charging positive relay and the quick charging negative relay all participate in working.
Further, the main current sensor and the auxiliary current sensor include the following four collocation methods according to actual needs:
firstly, a current sensor based on a fluxgate principle is used as a main current sensor, and a current sensor based on a Hall principle is used as an auxiliary current sensor;
secondly, a current sensor based on a current divider principle is used as a main current sensor, and a current sensor based on a Hall principle is used as an auxiliary current sensor;
thirdly, a current sensor adopting a fluxgate principle is used as a main current sensor, and a current sensor adopting a shunt principle is used as an auxiliary current sensor;
and fourthly, adopting the current sensor based on the current divider principle as a main current sensor and adopting the current sensor based on the fluxgate principle as an auxiliary current sensor.
Further, according to different rated currents and arc extinguishing requirements, the detonation fuse adopts the following two arc extinguishing modes:
firstly, connecting a traditional fuse in parallel at two ends of a detonation fuse for arc extinction;
and secondly, the detonation fuse is provided with a mechanical arc extinguishing device for arc extinguishing.
Further, the first pre-charging resistor and the second pre-charging resistor include the following three implementation manners according to different working conditions and pre-charging requirements:
firstly, a cement resistor is used as a first pre-charging resistor of a main pre-charging loop, and a metal aluminum shell resistor is used as a second pre-charging resistor of an auxiliary pre-charging loop;
secondly, a cement resistor is used as a first pre-charging resistor of the main pre-charging loop, and a gold resistor is used as a second pre-charging resistor of the auxiliary pre-charging loop;
and thirdly, adopting a gold resistor as a first pre-charging resistor of the main pre-charging loop, and adopting a metal aluminum shell resistor as a second pre-charging resistor of the auxiliary pre-charging loop.
Compared with the prior art, the utility model, it is showing the advantage and is: (1) under the condition that one or more electrical components of the BDU are damaged, the vehicle can be continuously used; (2) by design optimization and model selection calculation of electric devices under different working conditions, the automobile-level application can be met after the test requirements of the country and enterprises are met.
Drawings
Fig. 1 is a circuit structure diagram of the BDU high voltage circuit of the present invention.
Fig. 2 is a working flow chart of the circuit of the BDU high voltage loop of the present invention.
Detailed Description
In order to improve new forms of energy vehicle's operational reliability, the utility model provides a BDU high-voltage circuit increases a current sensor, a pre-charge return circuit, an intelligence high-voltage fuse in conventional BDU high-voltage circuit, and under the condition that certain or a plurality of electrical components damaged appeared in BDU, the vehicle can continue to use, improves BDU's operational reliability. In order to meet the functional requirements, the BDU needs to meet certain allowance during functional design, and two electric parts with different principles are designed at a vulnerable part for detection or standby during design.
The BDU high-voltage loop of the utility model is provided with a quick charge negative relay, a main current sensor and a main negative relay which are connected in series, and a quick charge positive relay, a main pre-charging loop and an auxiliary pre-charging loop which are connected in parallel;
an auxiliary current sensor is arranged at the positive end or the negative end of the BDU high-voltage loop and connected with a main current sensor in series, and a detonation fuse is additionally arranged at the positive end or the negative end and connected with a fuse in series.
Furthermore, the main pre-charging circuit comprises a first pre-charging relay and a first pre-charging resistor which are arranged in series, and the auxiliary pre-charging circuit comprises a second pre-charging relay and a second pre-charging resistor which are arranged in series.
Further, the detonation fuse, the main current sensor, the auxiliary current sensor, the main positive relay and the main negative relay form a discharging loop in a series connection mode;
during discharging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main positive relay, the main negative relay and the main pre-charging loop all participate in working, and if the main pre-charging loop fails, the auxiliary pre-charging loop participates in working.
Furthermore, the detonation fuse, the main current sensor, the auxiliary current sensor, the quick charge positive relay, the quick charge negative relay and the main negative relay form a charging loop in a series connection mode;
during charging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main negative relay, the quick charging positive relay and the quick charging negative relay all participate in working.
Further, the main current sensor and the auxiliary current sensor include the following four collocation methods according to actual needs:
firstly, a current sensor based on a fluxgate principle is used as a main current sensor, and a current sensor based on a Hall principle is used as an auxiliary current sensor;
secondly, a current sensor based on a current divider principle is used as a main current sensor, and a current sensor based on a Hall principle is used as an auxiliary current sensor;
thirdly, a current sensor adopting a fluxgate principle is used as a main current sensor, and a current sensor adopting a shunt principle is used as an auxiliary current sensor;
and fourthly, adopting the current sensor based on the current divider principle as a main current sensor and adopting the current sensor based on the fluxgate principle as an auxiliary current sensor.
Further, according to different rated currents and arc extinguishing requirements, the detonation fuse adopts the following two arc extinguishing modes:
firstly, connecting a traditional fuse in parallel at two ends of a detonation fuse for arc extinction;
and secondly, the detonation fuse is provided with a mechanical arc extinguishing device for arc extinguishing.
Further, the first pre-charging resistor and the second pre-charging resistor include the following three implementation manners according to different working conditions and pre-charging requirements:
firstly, a cement resistor is used as a first pre-charging resistor of a main pre-charging loop, and a metal aluminum shell resistor is used as a second pre-charging resistor of an auxiliary pre-charging loop;
secondly, a cement resistor is used as a first pre-charging resistor of the main pre-charging loop, and a gold resistor is used as a second pre-charging resistor of the auxiliary pre-charging loop;
and thirdly, adopting a gold resistor as a first pre-charging resistor of the main pre-charging loop, and adopting a metal aluminum shell resistor as a second pre-charging resistor of the auxiliary pre-charging loop.
The first and second current sensors need to have the following functions: whether the main current sensor works normally can be detected;
the detonation fuse needs to have the following functions: when the battery pack is abnormal, the detonation fuse can break a high-voltage loop and has certain arc extinguishing capacity, and when the detonation fuse body is fused, a certain mechanism must exist to realize rapid arc extinguishing;
the fuse needs to have the following functions: when high short-circuit current occurs in a battery system, the fuse needs to be reliably fused in time and needs to be capable of bearing current impact under complex working conditions;
the main and negative relays need to have the following functions: can continuously pass current higher than the maximum current of the whole pack, and has the durable life of cutting off the forward and reverse current;
the auxiliary pre-charging circuit needs to have the following functions: the auxiliary pre-charging circuit is required to have a switching function, and the auxiliary pre-charging circuit is disconnected under the condition that the main pre-charging circuit is normal; under the condition that the main pre-charging circuit fails, the auxiliary pre-charging circuit can meet the pre-charging requirement of the vehicle on the battery system.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Examples
With reference to fig. 1-2, the BDU high-voltage circuit of the present invention is configured by connecting a fast charge negative relay with a main current sensor and a main negative relay in series, and connecting a fast charge positive relay, a main pre-charge circuit and an auxiliary pre-charge circuit in parallel;
an auxiliary current sensor is arranged at the positive end or the negative end of the BDU high-voltage loop and connected with a main current sensor in series, and a detonation fuse is additionally arranged at the positive end or the negative end and connected with a fuse in series.
The main pre-charging loop comprises a first pre-charging relay and a first pre-charging resistor which are arranged in series, and the auxiliary pre-charging loop comprises a second pre-charging relay and a second pre-charging resistor which are arranged in series.
The embodiment provides a BDU high-voltage control loop with safe functions through a large amount of data analysis and comparison, and the BDU high-voltage control loop can meet the automobile-level application after the testing requirements of countries and enterprises can be met through design optimization and the model selection calculation of electric devices under different working conditions;
in the operation process of the battery system, the two current sensors work, and only the data uploaded by the main current sensor is processed in data processing. When the deviation value of the data values uploaded by the main current sensor and the auxiliary current sensor is larger than a set value, the current sensor is judged to be in fault, the vehicle gives an alarm and enters a wavelike mode;
the detonation fuse is connected with a conventional fuse in series, the fuse is controlled by the BMS or the vehicle controller, and the detonation fuse is controlled to be fused when a serious fault occurs in the battery system; the detonation fuse and the fuse are subjected to breaking protection, namely the detonation fuse is used for protecting lower fault current and other serious faults, the fuse is used for protecting larger short-circuit current, and when the fuse is in a type selection mode, the mode selection can be carried out by considering the performance of increasing the current impact resistance of the fuse;
and thirdly, when the main pre-charging loop works normally, the auxiliary pre-charging loop is disconnected. And the resistance values of the first pre-charging resistor and the second pre-charging resistor are monitored in real time, and after the main pre-charging loop fails, the auxiliary pre-charging loop is switched into work, so that the battery system can enter a working mode, and meanwhile, the vehicle maintenance is reminded.
And fourthly, the quick charge negative relay is connected in series at the rear end of the main negative relay, and when the main positive relay and the main negative relay are in fault, the high-voltage loop can be cut off through the main negative relay.
When the BDU fails, an auxiliary device or an auxiliary function in the BDU works and reports the failure to the vehicle controller, and the vehicle is placed in a safe state by the vehicle controller.
The current sensor can be implemented according to actual needs, and in this embodiment, the following collocation manner exists:
designing a current sensor adopting a fluxgate principle as a main current sensor and a sensor adopting a Hall principle as an auxiliary current sensor;
a sensor adopting a current divider principle is designed to be used as a main current sensor, and a sensor adopting a Hall principle is used as an auxiliary current sensor.
A sensor adopting a fluxgate principle is designed to be used as a main current sensor, and a sensor adopting a shunt principle is designed to be used as an auxiliary current sensor.
A sensor adopting a shunt principle is designed to be used as a main current sensor, and a sensor adopting a fluxgate principle is designed to be used as an auxiliary current sensor.
The intelligent high-voltage fuse can be specifically implemented according to different rated currents and arc extinguishing requirements, and the following implementation modes exist in the arc extinguishing mode in the embodiment:
two ends of the detonation fuse main body are connected with a traditional fuse in parallel for arc extinction;
the pre-charging resistor can be implemented according to different working conditions and pre-charging requirements, and the following implementation modes exist in the embodiment:
the design adopts a cement resistor as a main pre-charging resistor, and a metal aluminum shell resistor as a pre-charging resistor of an auxiliary loop;
the design adopts a cement resistor as a main pre-charging resistor, and a gold resistor as a pre-charging resistor of an auxiliary loop;
the design adopts gold resistance as main pre-charging resistance, and metal aluminum shell resistance as the pre-charging resistance of the auxiliary loop.
During discharging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main positive relay, the main negative relay and the main pre-charging loop all participate in working, and if the main pre-charging loop fails, the auxiliary pre-charging loop participates in working.
During charging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main negative relay, the quick charging positive relay and the quick charging negative relay all participate in working.
The utility model discloses appear under the condition that certain or a plurality of electrical components damaged at BDU, the vehicle can continue to use, has improved the operational reliability in BDU high-pressure return circuit.
Claims (7)
1. A BDU high-voltage loop is characterized in that a quick charge negative relay, a main current sensor and a main negative relay are connected in series, and a quick charge positive relay, a main pre-charging loop and an auxiliary pre-charging loop are connected in parallel;
an auxiliary current sensor is arranged at the positive end or the negative end of the BDU high-voltage loop and connected with a main current sensor in series, and a detonation fuse is additionally arranged at the positive end or the negative end and connected with a fuse in series.
2. A BDU high-voltage loop according to claim 1, wherein the main pre-charging loop comprises a first pre-charging relay and a first pre-charging resistor which are arranged in series, and the auxiliary pre-charging loop comprises a second pre-charging relay and a second pre-charging resistor which are arranged in series.
3. The BDU high voltage circuit of claim 2, wherein the detonation fuse, the main current sensor, the auxiliary current sensor, the main positive relay and the main negative relay are connected in series to form a discharge circuit;
during discharging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main positive relay, the main negative relay and the main pre-charging loop all participate in working, and if the main pre-charging loop fails, the auxiliary pre-charging loop participates in working.
4. The BDU high-voltage loop of claim 2, wherein the detonation fuse, the main current sensor, the auxiliary current sensor, the quick charge positive relay, the quick charge negative relay and the main negative relay are connected in series to form a charging loop;
during charging, the main current sensor, the auxiliary current sensor, the detonation fuse, the main negative relay, the quick charging positive relay and the quick charging negative relay all participate in working.
5. A BDU high-voltage loop according to claim 3 or 4, wherein the main current sensor and the auxiliary current sensor comprise the following four collocation modes according to actual needs:
firstly, a current sensor based on a fluxgate principle is used as a main current sensor, and a current sensor based on a Hall principle is used as an auxiliary current sensor;
secondly, a current sensor based on a current divider principle is used as a main current sensor, and a current sensor based on a Hall principle is used as an auxiliary current sensor;
thirdly, a current sensor adopting a fluxgate principle is used as a main current sensor, and a current sensor adopting a shunt principle is used as an auxiliary current sensor;
and fourthly, adopting the current sensor based on the current divider principle as a main current sensor and adopting the current sensor based on the fluxgate principle as an auxiliary current sensor.
6. A BDU high-voltage loop according to claim 3 or 4, wherein, the detonating fuse adopts the following two modes according to different rated currents and arc extinguishing requirements:
firstly, connecting a traditional fuse in parallel at two ends of a detonation fuse for arc extinction;
and secondly, the detonation fuse is provided with a mechanical arc extinguishing device for arc extinguishing.
7. A BDU high-voltage loop according to claim 3 or 4, wherein the first pre-charge resistor and the second pre-charge resistor comprise the following three realization modes according to different working conditions and pre-charge requirements:
firstly, a cement resistor is used as a first pre-charging resistor of a main pre-charging loop, and a metal aluminum shell resistor is used as a second pre-charging resistor of an auxiliary pre-charging loop;
secondly, a cement resistor is used as a first pre-charging resistor of the main pre-charging loop, and a gold resistor is used as a second pre-charging resistor of the auxiliary pre-charging loop;
and thirdly, adopting a gold resistor as a first pre-charging resistor of the main pre-charging loop, and adopting a metal aluminum shell resistor as a second pre-charging resistor of the auxiliary pre-charging loop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021815042.8U CN214355543U (en) | 2020-08-27 | 2020-08-27 | BDU high-pressure loop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021815042.8U CN214355543U (en) | 2020-08-27 | 2020-08-27 | BDU high-pressure loop |
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| CN214355543U true CN214355543U (en) | 2021-10-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116394763A (en) * | 2023-06-07 | 2023-07-07 | 武汉嘉晨电子技术有限公司 | Battery pack safety protection system |
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2020
- 2020-08-27 CN CN202021815042.8U patent/CN214355543U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116394763A (en) * | 2023-06-07 | 2023-07-07 | 武汉嘉晨电子技术有限公司 | Battery pack safety protection system |
| CN116394763B (en) * | 2023-06-07 | 2023-10-03 | 武汉嘉晨电子技术有限公司 | Battery pack safety protection system |
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