A multiple combination method of BMS for improving the reliable wake-up of national standard fast charging

Abstract

The application discloses a multiple combination method for improving the reliable wake-up of the national standard fast charging of a BMS, which comprises three wake-up modes of CC2 single wake-up, A+A-wake-up and S+S-charge message wake-up; when one or two of the wake-up modes fail, the wake-up can be performed through the other wake-up mode; wherein: the CC2 single wake-up mode is realized through a wake-up path composed of a CC2 fast charging circuit, a single wake-up circuit and a BMS connected in sequence; the A+A-wake-up mode is realized through a wake-up path composed of a charging pile, an A+A-assisted power taking circuit and a BMS connected in sequence; and the S+S-charge message wake-up mode is realized through a wake-up path composed of a charging pile, an S+S-charge message wake-up circuit and a BMS connected in sequence. The application can reduce the failure rate of the wake-up circuit, and improve the reliability, stability and safety of the new energy vehicle in relation to charging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of BMS charging, in particular to a multiple combination method of BMS for improving the reliable wake-up of national standard fast charging. BACKGROUND

[0002] The existing BMS function about the wake-up in national standard 20234.3-2015 is generally based on the wake-up of A+A- auxiliary power supply, but due to the singleness of the wake-up circuit, the charging wake-up failure rate of the vehicle is increased, such as when the vehicle wake-up loop wire harness fails or the hardware of the BMS about the A+A- wake-up fails, the vehicle cannot be charged and used normally. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art and provide a multiple combination method of BMS for improving the reliable wake-up of national standard fast charging.

[0004] The technical scheme of the present application is as follows:

[0005] A multiple combination method of BMS for improving the reliable wake-up of national standard fast charging, the method comprising CC2 single wake-up, A+A- wake-up and S+S- charging message wake-up three wake-up modes, when one or two of the wake-up modes fail, the wake-up can be performed through the other wake-up mode, wherein:

[0006] The CC2 single wake-up mode is realized through the wake-up path composed of CC2 fast charging circuit, single wake-up circuit and BMS connected in sequence;

[0007] The A+A- wake-up mode is realized through the wake-up path composed of charging pile, A+A- auxiliary power supply circuit and BMS connected in sequence;

[0008] The S+S- charging message wake-up mode is realized through the wake-up path composed of charging pile, S+S- charging message wake-up circuit and BMS connected in sequence.

[0009] Further, the single wake-up circuit includes a fast charging connection confirmation input port, a first PNP triode, a power storage capacitor, an NPN triode, a second PNP triode, and a CC2 wake-up output port. The E pole of the first PNP triode is connected to a power supply. The B pole and the E pole of the first PNP triode are connected to a CC2 fast charging circuit through the fast charging connection confirmation input port. The C pole of the first PNP triode is connected to the B pole and the E pole of the NPN triode through the power storage capacitor. The C pole of the NPN triode is connected to the B pole of the second PNP triode. The E pole of the second PNP triode is connected to the power supply. The C pole of the second PNP triode is connected to the CC2 wake-up input port of the BMS through the CC2 wake-up output port. The CC2 fast charging circuit is connected to a lead-acid battery of 12V or 24V of an electric vehicle as the power supply. When connected, a 1K resistor is connected to the ground. After the charging gun is connected, the input level of the fast charging connection confirmation input port of the single wake-up circuit is 1 / 2 of the lead-acid battery. The first PNP triode is in a conducting state, and the C pole voltage thereof is 1 / 2 of the lead-acid battery. The NPN triode is also in a conducting state under the action of the power storage capacitor. The CC2 wake-up output port outputs a high level of 1 / 2 of the lead-acid battery to wake up the BMS. When the power storage capacitor is fully charged, the CC2 wake-up input port of the BMS has no high level input due to insufficient NPN triode conduction voltage, and the wake-up signal disappears.

[0010] Further, the BMS has a keep wake-up function, and the wake-up processing strategy is performed through the keep wake-up signal of the MCU.

[0011] Further, the CC2 fast charging circuit is provided with a signal detection port, and the accuracy of the CC2 wake-up signal is identified through the signal detection port after wake-up.

[0012] Further, the A+A- auxiliary power taking circuit outputs a high level to the ONBD_CHG_P port of the BMS to wake up the BMS after the charging pile is started.

[0013] Further, the A+A- auxiliary power taking circuit and the ONBD_CHG_P port of the BMS are further connected to a signal detection circuit, and the voltage of the connected charging auxiliary power is identified through the signal detection circuit after wake-up to perform strategy data analysis.

[0014] Further, the S+S- charging message wake-up circuit includes a message wake-up chip. When the charging gun is connected and charging is started, the message sent by the charging pile is connected to the CAN_INH input port of the BMS through the CAN_INH output port of the message wake-up chip to wake up the BMS.

[0015] Compared with the prior art, the application has the beneficial effects that: the application adopts the combination of multiple wake-up circuits, including CC2 single wake-up, A+A- wake-up and S+S- charging message wake-up, when one or two of the wake-up modes fail, the other wake-up mode can be used for wake-up, thereby reducing the failure rate of the wake-up circuit, and improving the reliability, stability and safety of the new energy vehicle in charging. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1 The circuit schematic diagram of the CC2 fast charging circuit of the present application is shown in the figure.

[0018] Figure 2 The circuit schematic diagram of the single wake-up circuit of the present application is shown in the figure.

[0019] Figure 3 The circuit schematic diagram of the BMS of the present application is shown in the figure.

[0020] Figure 4 The circuit schematic diagram of the A+A- auxiliary power taking circuit of the present application is shown in the figure.

[0021] Figure 5 The circuit schematic diagram of the signal detection circuit of the present application is shown in the figure.

[0022] Figure 6 The circuit schematic diagram of the S+S- charging message wake-up circuit of the present application is shown in the figure. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0024] In order to illustrate the technical solutions of the present application, the following will be described through specific embodiments.

[0025] EMBODIMENT

[0026] The embodiment proposes a multiple combination method of BMS for improving the reliable wake-up of national standard fast charging, which includes three wake-up modes of CC2 single wake-up, A+A- wake-up and S+S- charging message wake-up. When one or two wake-up modes fail, the wake-up can be performed through another wake-up mode.

[0027] (1) CC2 single wake-up

[0028] The CC2 single wake-up mode is realized through a wake-up path composed of a CC2 fast charging circuit, a single wake-up circuit and a BMS connected in sequence.

[0029] In combination with FIGS. 3, 4 and 5, Figure 1 Figure 2 Figure 3 As shown in FIGS. 3, 4 and 5, the single wake-up circuit includes a fast charging connection confirmation input port DC DET P2 (CC2), a first PNP triode Qe9, an electricity storage capacitor Ce3, an NPN triode Qe11, a second PNP triode Qe10 and a CC2 wake-up output port, the E pole of the first PNP triode Qe9 is connected to a power supply LINE+, the B pole and the E pole of the first PNP triode Qe9 are connected to the CC2 fast charging circuit through the fast charging connection confirmation input port DC DET P2 (CC2), the C pole of the first PNP triode Qe9 is connected to the B pole and the E pole of the NPN triode Qe11 through the electricity storage capacitor Ce3, the C pole of the NPN triode Qe11 is connected to the B pole of the second PNP triode Qe10, the E pole of the second PNP triode Qe10 is connected to the power supply LINE+, the C pole of the second PNP triode Qe10 is connected to the CC2 wake-up input port of the BMS through the CC2 wake-up output port, the CC2 fast charging circuit is connected to a lead-acid battery 12V or 24V of an electric vehicle as the power supply LINE+, when connected, a 1K resistor is connected to the ground, after the charging gun is connected, the input level of the fast charging connection confirmation input port DC DET P2 (CC2) of the single wake-up circuit is 1 / 2 of the lead-acid battery, the first PNP triode Qe9 is in a conductive state, the C pole voltage thereof is 1 / 2 of the lead-acid battery, the NPN triode Qe11 is also in a conductive state under the action of the electricity storage capacitor Ce3, the CC2 wake-up output port outputs a high level of 1 / 2 of the lead-acid battery to wake up the BMS, when the electricity storage capacitor is fully charged, the NPN triode Qe11 is insufficient in the conductive voltage, leading to no high level input of the CC2 wake-up input port of the BMS, and the wake-up signal disappears.

[0030] The CC2 fast charging circuit is provided with a signal detection port, through which the accuracy of the CC2 wake-up signal is identified after wake-up.

[0031] The BMS has a keep wake-up function, after the BMS is woken up, the MCU can make some wake-up processing strategies through the keep wake-up signal CON. ​​

[0032] The CC2 signal is part of a single-wake-up circuit design. It can wake up the battery by plugging in the charging gun and delay power-off according to a strategy (the delay time can be modified by software; the purpose of the delay is to wait for the user to plug in the charging gun before starting charging). When the customer has fully charged the battery but has not unplugged the charging gun, the self-wake-up mode can be automatically removed by pulling the CON signal low, allowing the BMS to enter a sleep state even when the charging gun is plugged in, reducing the self-discharge of the car battery and power battery. Pluging in the charging gun again will repeat the wake-up action. In application, the holding time of the CC2_WAKEUP wake-up signal can be controlled by adjusting the size of the storage capacitor Ce3.

[0033] (2) A+A- wake-up

[0034] The A+A- wake-up method is implemented through a wake-up path consisting of a charging pile, an A+A- auxiliary power supply circuit, and a BMS connected in sequence. Figure 3 , Figure 4 As shown, the A+A- auxiliary power supply circuit outputs a high level, such as 12V+, to the ONBD_CHG_P port of the BMS to wake up the BMS after the charging pile is started. At the same time, it connects to the CHG_POW+ port to realize the auxiliary power supply of the BMS.

[0035] Preferably, a signal detection circuit is also connected between the A+A- auxiliary power supply circuit and the ONBD_CHG_P port of the BMS, combined with... Figure 5 As shown, after waking up, the signal detection circuit identifies the voltage of the charging auxiliary power supply to perform strategy data analysis.

[0036] (3) S+S-charging message

[0037] The S+S charging message wake-up method is implemented through a wake-up path consisting of a charging pile, an S+S charging message wake-up circuit, and a BMS connected in sequence. The S+S charging message wake-up circuit includes a message wake-up chip. When the charging gun is connected and charging is started, the message sent by the charging pile is connected to the CAN_INH input port of the BMS through the CAN_INH output port of the message wake-up chip to wake up the BMS.

[0038] If one or two of the above three wake-up circuits fail, the other wake-up circuit can still wake up the BMS for charging. This effectively solves the possibility of failure to charge when a single wake-up fails, greatly reducing the failure rate. After charging is completed, the charging pile will automatically turn off the charging auxiliary power and stop sending CAN messages, and the BMS can enter the sleep state of plug-in mode.

[0039] The above merely preferred embodiments of the present application are not intended to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A multiple combination method of BMS for improving the reliable wake-up of national standard fast charging, characterized in that, The method comprises three wake-up modes of CC2 single wake-up, A+A- wake-up and S+S- charging message wake-up, when one or two of the wake-up modes are invalid, the other wake-up mode can be used to wake up, wherein: The CC2 single wake-up mode is realized through a wake-up path composed of a CC2 fast charging circuit, a single wake-up circuit and a BMS in sequence; The single wake-up circuit comprises a fast charging connection confirmation input port, a first PNP triode, an electricity storage capacitor, an NPN triode, a second PNP triode and a CC2 wake-up output port, the E pole of the first PNP triode is connected to a power supply, the B pole and the E pole of the first PNP triode are connected to the CC2 fast charging circuit through the fast charging connection confirmation input port, the C pole of the first PNP triode is connected to the B pole and the E pole of the NPN triode through the electricity storage capacitor, the C pole of the NPN triode is connected to the B pole of the second PNP triode, the E pole of the second PNP triode is connected to the power supply, the C pole of the second PNP triode is connected to the CC2 wake-up input port of the BMS through the CC2 wake-up output port, the CC2 fast charging circuit is connected to a lead-acid battery of 12V or 24V of an electric vehicle as the power supply, when connected, a 1K resistor is connected to the ground, after the charging gun is connected, the input level of the fast charging connection confirmation input port of the single wake-up circuit is 1 / 2 of the lead-acid battery, the first PNP triode is in a conducting state, the C pole voltage thereof is 1 / 2 of the lead-acid battery, under the action of the electricity storage capacitor, the NPN triode is also in a conducting state, the CC2 wake-up output port outputs a high level of 1 / 2 of the lead-acid battery to wake up the BMS, when the electricity storage capacitor is fully charged, the NPN triode is insufficient in the conducting voltage, the CC2 wake-up input port of the BMS has no high level input, and the wake-up signal disappears; The A+A- wake-up mode is realized through a wake-up path composed of a charging pile, an A+A- auxiliary power taking circuit and a BMS in sequence; The A+A- auxiliary power taking circuit outputs a high level to the ONBD_CHG_P port of the BMS to wake up the BMS after the charging pile is started, and a signal detection circuit is further connected between the A+A- auxiliary power taking circuit and the ONBD_CHG_P port of the BMS, the voltage of the connected charging auxiliary power supply is identified through the signal detection circuit after wake-up to make strategy data analysis; The S+S- charging message wake-up mode is realized through a wake-up path composed of a charging pile, an S+S- charging message wake-up circuit and a BMS in sequence.

2. The multiple combination method of the BMS for improving the reliable wake-up of the national standard fast charging according to claim 1, characterized in that: The BMS has a keep wake-up function, and a keep wake-up signal of an MCU is used to make a wake-up processing strategy.

3. The multiple combination method of the BMS for improving the reliable wake-up of the national standard fast charging according to claim 1, characterized in that: The CC2 fast charging circuit is provided with a signal detection port, and the accuracy of the CC2 wake-up signal is identified through the signal detection port after wake-up.

4. The multiple combination method of BMS for improving the reliable wake-up of GB fast charging according to claim 1, characterized in that: The S+S- charging message wake-up circuit comprises a message wake-up chip, when the charging gun is connected and charging is started, the message sent by the charging pile is connected to the CAN_INH input port of the BMS through the CAN_INH output port of the message wake-up chip to wake up the BMS.

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