CN109624788B - Power battery pre-charging state judgment system and judgment method - Google Patents
Power battery pre-charging state judgment system and judgment method Download PDFInfo
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- CN109624788B CN109624788B CN201811626119.4A CN201811626119A CN109624788B CN 109624788 B CN109624788 B CN 109624788B CN 201811626119 A CN201811626119 A CN 201811626119A CN 109624788 B CN109624788 B CN 109624788B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The invention relates to a power battery pre-charging state judging system and a judging method, wherein the power battery pre-charging state judging system comprises a current signal collector and a comparator which are connected on a basic high-voltage loop, wherein the current signal collector is connected on a bus in series so as to sample and detect bus current information and transmit a detected current signal to a main control unit; the comparator is connected with the main control unit and used for comparing the change value of the current bus current information relative to the bus current information in the last sampling period with a preset change threshold value so as to judge the pre-charging state of the power battery. The power battery pre-charging state judgment system provided by the invention judges the pre-charging state by sampling, detecting and comparing bus current information; compared with the judging method for collecting the voltage signal in the prior art, a special high-voltage collecting chip and an isolating communication chip are not required, so that the judging circuit is simple in structure and low in cost.
Description
Technical Field
The invention relates to the technical field of electric vehicle charging management, in particular to a power battery pre-charging state judgment system, and meanwhile, the invention also relates to a power battery pre-charging state judgment method.
Background
Currently, it is usually determined whether the voltage on the load capacitor reaches the requirement within a specified time as a determination of whether the precharge of the load capacitor is completed. According to the judging method, a high-voltage acquisition circuit is adopted to acquire the voltages at two ends of the battery pack and the voltages at two ends of the load capacitor in real time, and after A/D conversion, the MCU is used for comparing and judging whether the voltages at two ends of the load capacitor reach the specified value of the voltage of the battery pack.
Based on the above determination process, the above determination method has the following problems:
1. the real-time property is poor: because the voltage to be measured is high voltage, after sampling and A/D conversion, isolation communication is needed, so that the data acquisition is delayed, the real-time performance is poor, and the judgment effect is poor;
2. increasing the load of the CPU: after the pre-charging relay is closed, the CPU is required to monitor and compare the voltage in real time, the operation processing time of the CPU is occupied, and the load of the CPU is increased;
3. the cost is high: a special high-voltage acquisition chip and an isolation communication chip are required to be added, the circuit complexity is increased, and the cost is increased.
Disclosure of Invention
In view of the above, the present invention is directed to a system for determining a pre-charge state of a power battery, which has a simple determining circuit, a low cost and a good determining effect.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a power battery precharge state judgement system, the application is connected on basic high voltage loop, basic high voltage loop includes high voltage power supply, connect through the generating line connect parallelly set up in high voltage power supply positive terminal's high-pressure positive relay and high-pressure precharge relay connect in the high voltage power supply negative terminal's high-pressure negative relay, and parallelly connected in load on the high voltage power supply, this judgement system includes:
the current signal collector is connected in series with the bus to sample and detect bus current information and transmit a detected current signal to the main control unit;
and the comparator is connected with the main control unit and is used for comparing the change value of the current bus current information relative to the bus current information in the last sampling period with a preset change threshold value so as to judge the pre-charging state of the power battery.
Further, the change value of the bus current information is a difference value of a current bus current value relative to a bus current value of a previous sampling period; the variation threshold is a current threshold.
Further, the change value of the bus current information is a change rate of a current bus current value relative to a bus current value of a previous sampling period; the change threshold is a current rate of change threshold.
Further, the current signal collector is a current divider.
Compared with the prior art, the invention has the following advantages:
the power battery pre-charging state judgment system judges the pre-charging state of a power battery by sampling and detecting bus current information and comparing the current information with the change value of the current information in the last sampling period with the preset change preset; compared with the judging method for collecting the voltage signal in the prior art, a special high-voltage collecting chip and an isolating communication chip are not required to be arranged, so that the judging circuit of the judging system is simple in structure, low in cost and good in judging effect.
Another objective of the present invention is to provide a method for determining a pre-charge state of a power battery, the method comprising the following steps:
a precharge starting step;
a current signal acquisition step, wherein a current signal collector acquires a current signal on a bus in real time;
the main control unit controls the comparator to compare the change value of the current bus current information acquired by the current signal collector relative to the bus current information of the previous sampling period with a preset change threshold value so as to judge whether the power battery pre-charging is finished;
and a power-on step, namely, after the high-voltage positive pole relay is closed when the pre-charging is finished, the high-voltage pre-charging relay is disconnected, and the load is powered on.
Further, in the comparing step, the change value of the bus current information is a difference value of the current bus current value relative to the bus current value of the last sampling period; the variation threshold is a current threshold.
Further, in the comparison step, when Ip-Ip (la σ t) is larger than or equal to σ, judging that the pre-charging is finished, executing the electrifying step, otherwise, executing the current signal acquisition step; wherein Ip is the current bus current value in real time, Ip (last) is the bus current value of the last sampling period, and σ is the preset current threshold value infinitely approaching 0.
Further, in the comparing step, the change value of the bus current information is a change rate of the current bus current value relative to the bus current value of the last sampling period; the change threshold is a current rate of change threshold.
Further, in the comparison step, when (Ip-Ip (last))/Δ t is greater than or equal to σ, judging that the precharging is finished, executing the electrifying step, otherwise, executing the current signal acquisition step; wherein Ip is the current bus current value in real time, Ip (last) is the bus current value of the last sampling period, Δ t is the sampling period, and σ is the preset current change rate threshold value of a negative number infinitely approaching 0.
Compared with the prior art, the invention has the following advantages:
compared with the prior art, the method for judging the pre-charging state of the power battery has the same beneficial effects as the system for judging the pre-charging state of the power battery, and the detailed description is omitted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a power battery pre-charge state determination system according to a first embodiment of the present invention;
fig. 2 is a waveform diagram illustrating changes in charging capacitance and bus current during operation of the power battery according to the first embodiment of the present invention;
Detailed Description
It should be noted that 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 embodiments with reference to the attached drawings.
Example one
The embodiment relates to a power battery pre-charging state judgment system which mainly comprises a current signal collector and a comparator, wherein the current signal collector and the comparator are connected to a basic high-voltage loop; and the comparator is connected with the main control unit and used for comparing the change value of the current bus current information relative to the bus current information of the last sampling period with a preset change threshold value so as to judge the pre-charging state of the power battery. The basic high-voltage circuit of the embodiment is similar to the existing structure, and comprises a high-voltage power supply, a high-voltage positive relay and a high-voltage pre-charging relay which are connected in parallel at the positive end of the high-voltage power supply through a bus, a high-voltage negative relay connected at the negative end of the high-voltage power supply, and a load connected in parallel on the high-voltage power supply.
Based on the above determination idea, an exemplary structure of the power battery pre-charge state determination system of the embodiment is shown in fig. 1, and includes a battery pack as a high-voltage power supply, a high-voltage positive relay S1 and a high-voltage pre-charge relay S2 connected in parallel to the positive terminal of the battery pack, a high-voltage negative relay S3 connected to the negative terminal of the battery pack, and a load R connected in parallel to the battery packCAnd a charging capacitor C. In addition, in order to prevent the over current from damaging the electric elements at the moment of pre-charging, a pre-charging resistor R is connected in series with a branch circuit with a high-voltage pre-charging relay S2pre。
The current signal collector in the embodiment specifically adopts the shunt because the bus current value of the high-voltage circuit is large and is inconvenient to measure. Of course, instead of using the shunt to measure the current information of the bus, the hall sensor can be used to collect the current information of the bus. In addition, in order to improve the use effect, especially to improve the judgment sensitivity of the pre-charge state, the main control unit and the comparator of the embodiment are integrated on the MCU, and can receive the current information collected by the current divider, perform judgment and comparison to obtain the pre-charge state of the power battery, and control the on/off of the high-voltage positive relay S1, the high-voltage pre-charge relay S2 and the high-voltage negative relay S3 to form the switching between the pre-charge circuit and the upper circuit.
Based on the waveform diagrams of the change of the charging capacitor voltage Uc and the bus current Ip in the working process of the power battery shown in fig. 2, the change rules of Uc and Ip are similar, and when the pre-charging is completed, Uc and Ip reach extreme values at the same time, so that the pre-charging state can be obtained by acquiring the bus current information Ip in real time and performing judgment and comparison. Specifically, the change value of the bus current information is specifically a difference value of a current bus current value Ip relative to a bus current value Ip (last) of a previous sampling period, that is, Ip-Ip (last); and the variation threshold is in particular a current threshold. When Ip-Ip (la sigma t) is larger than or equal to sigma, the charging is represented to be completed, then the high-voltage pre-charging relay S2 is switched off after the high-voltage positive relay S1 is switched on, and the load R is subjected toCAnd powering on to perform a charging process. The current threshold of the present embodiment is specifically a negative value approaching 0 infinitely, for example,σ can be-0.05, -0.01, etc.
The change value of the bus current information is also the rate of change of the current bus current value Ip with respect to the bus current value Ip (last) in the previous sampling period, that is, (Ip-Ip (last))/Δ t, and the change threshold is a current change rate threshold. And when (Ip-Ip (last))/delta t ≧ sigma, the charging is characterized to be completed. Based on the waveform diagram of the bus current Ip shown in fig. 2, the current variation threshold of the present embodiment is also a negative value approaching 0 infinitely, for example, σ may also be-0.05, -0.01, etc.
Based on the above overall description, the power battery precharge state judgment system described in this embodiment judges the precharge state of the power battery by sampling and detecting the bus current information and comparing the current information with the change value of the current information in the previous sampling period with the preset change preset; compared with the judging method for collecting the voltage signal in the prior art, a special high-voltage collecting chip and an isolating communication chip are not required to be arranged, so that the judging circuit of the judging system is simple in structure, low in cost and good in judging effect.
Example two
The embodiment relates to a method for judging a pre-charging state of a power battery, which specifically comprises the following steps:
a precharge starting step;
a current signal acquisition step, namely acquiring a current signal on a bus in real time by using a current divider;
comparing, namely comparing the change value of the current bus current information acquired by the current signal acquisition unit relative to the bus current information of the last sampling period with a preset change threshold value by the MCU to judge whether the power battery pre-charging is finished or not;
and a power-on step, namely when the pre-charging is finished, after the high-voltage positive electrode relay S1 is closed, the high-voltage pre-charging relay S2 is switched off, and the load R is subjected to the power-on stepCAnd (6) powering up.
In the comparison step, when Ip-Ip (la σ t) is larger than or equal to σ, judging that the pre-charging is finished, executing the electrifying step, and otherwise, executing the current signal acquisition step; where Ip is the current bus current value in real time, Ip (last) is the bus current value of the last sampling period, and σ is the preset current threshold approaching 0 infinitely, e.g., -0.01, -0.005, etc.
In addition, in the comparing step, the change value of the bus current information may also be a change rate of the current bus current value relative to the bus current value of the last sampling period; and the change threshold is a current rate of change threshold. At the moment, when (Ip-Ip (last))/delta t is larger than or equal to sigma, judging that the pre-charging is finished, executing the electrifying step, otherwise, executing the current signal acquisition step; where Ip is the current bus current value in real time, Ip (last) is the bus current value of the last sampling period, Δ t is the sampling period, σ is the preset current change rate threshold value of negative number approaching to 0 infinitely, e.g., -0.01, -0.005, and Δ t may be 0.1s, 0.5s, and so on.
The method for judging the power battery pre-charging system can have a better judgment effect on the pre-charging state.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The utility model provides a power battery precharge state judges system, the application is connected on basic high-voltage circuit, basic high-voltage circuit includes high voltage power supply, connect through the generating line connect parallelly set up in high voltage power supply positive terminal's high-pressure positive relay and high-pressure precharge relay connect in the high voltage power supply negative terminal's high-pressure negative relay, and connect in parallel in load on the high voltage power supply, its characterized in that: the judgment system includes:
the current signal collector is connected in series with the bus to sample and detect bus current information and transmit a detected current signal to the main control unit;
the comparator is connected with the main control unit and used for comparing the change value of the current bus current information relative to the bus current information of the last sampling period with a preset change threshold value so as to judge the pre-charging state of the power battery;
the change value of the bus current information is the difference value of the current bus current value relative to the bus current value of the last sampling period; the change threshold is a current threshold;
or the change value of the bus current information is the change rate of the current bus current value relative to the bus current value in the last sampling period; the change threshold is a current change rate threshold;
the current signal collector is a current divider, and the main control unit and the comparator are integrated on the MCU.
2. A method for judging the pre-charging state of a power battery is characterized in that: the method is based on the power battery pre-charging state judgment system of claim 1 and comprises the following steps:
a precharge starting step;
a current signal acquisition step, wherein a current signal collector acquires a current signal on a bus in real time;
the main control unit controls the comparator to compare the change value of the current bus current information acquired by the current signal collector relative to the bus current information of the previous sampling period with the change threshold value of the threshold value so as to judge whether the power battery pre-charging is finished;
a power-on step, namely, after the high-voltage positive pole relay is closed when the pre-charging is finished, the high-voltage pre-charging relay is disconnected to power on the load;
in the comparing step, the change value of the bus current information is the difference value of the current bus current value relative to the bus current value of the last sampling period; the change threshold is a current threshold;
or in the comparison step, the change value of the bus current information is the change rate of the current bus current value relative to the bus current value in the last sampling period; the change threshold is a current rate of change threshold.
3. The power battery precharge state judgment method according to claim 2, characterized in that: in the comparison step, when Ip-Ip (last) is larger than or equal to sigma, judging that the pre-charging is finished, executing the electrifying step, otherwise, executing the current signal acquisition step; wherein Ip is the current bus current value in real time, Ip (last) is the bus current value of the last sampling period, and σ is the preset current threshold value infinitely approaching 0.
4. The power battery precharge state judgment method according to claim 2, characterized in that: in the comparison step, when (Ip-Ip (last))/delta t is more than or equal to sigma, judging that the pre-charging is finished, executing the electrifying step, otherwise, executing the current signal acquisition step; wherein Ip is the current bus current value in real time, Ip (last) is the bus current value of the last sampling period, Δ t is the sampling period, and σ is the preset current change rate threshold value of a negative number infinitely approaching 0.
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| US7586214B2 (en) * | 2006-10-11 | 2009-09-08 | Gm Global Technology Operations, Inc. | High voltage energy storage connection monitoring system and method |
| CN103001265B (en) * | 2011-09-08 | 2014-10-29 | 北汽福田汽车股份有限公司 | High-voltage output electrical box for power battery |
| US9925933B2 (en) * | 2013-08-30 | 2018-03-27 | Ford Global Technologies, Llc | Pre-charge quick key cycling protection |
| KR20150096919A (en) * | 2014-02-17 | 2015-08-26 | 현대자동차주식회사 | Electric automobile |
| EP3017993B1 (en) * | 2014-11-07 | 2021-04-21 | Volvo Car Corporation | Power and current estimation for batteries |
| CN104836294B (en) * | 2015-05-08 | 2018-03-16 | 深圳市英威腾电动汽车驱动技术有限公司 | A kind of charge control method of pre-charge circuit |
| KR102065737B1 (en) * | 2016-02-18 | 2020-01-13 | 주식회사 엘지화학 | Charging or discharging system and method for diagnosing state of contactor |
| US10549643B2 (en) * | 2016-08-09 | 2020-02-04 | Ford Global Technologies, Llc | Controlled pre-charge circuit arrangement |
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Address after: No.8899 Xincheng Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: SVOLT Energy Technology Co.,Ltd. Address before: 213200 168 Huacheng Road, Jintan District, Changzhou, Jiangsu Patentee before: SVOLT Energy Technology Co.,Ltd. |