Pure electric vehicle low-voltage lead-acid storage battery charging strategy and system thereof

Abstract

The invention discloses a charging method and device for a low-voltage lead-acid battery for a pure electric vehicle by using a solar charging panel. The charging system comprises a solar charging module, a low-voltage lead-acid battery, a vehicle body controller (BCM), a power storage battery module and a remote interaction module. According to the charging method for the low-voltage lead-acid battery, an existing method for charging the lead-acid battery through a power battery is combined with a solar charging and charging method, a solar charging module is preferentially used in the charging method for the low-voltage lead-acid battery, and power battery charging is used as a candidate scheme. When the solar charging module and the power system battery module cannot be charged, a client can be reminded of charging in time through the remote interaction module, and the vehicle has a feed risk. According to the scheme provided by the invention, the feed risk of the lead-acid battery can be effectively reduced, solar energy resources are mainly utilized, and the energy consumption of the power battery is basically avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage lead-acid battery charging for new energy vehicles, and particularly to a strategy for charging lead-acid batteries using a solar charging panel. Background Art

[0002] When a pure electric vehicle is in an unused or parked state, the controller is not in a completely powered-down state, and a lead-acid battery is required to provide constant power for low-power operation. During long-term parking, due to the continuous consumption of each controller of the whole vehicle and the self-discharge of the lead-acid battery itself, it is easy to cause the situation that the vehicle cannot start due to the power failure of the lead-acid battery. To prevent the above situation, there is currently a strategy of charging the lead-acid battery with a power battery. However, for the protection of the power battery, generally when the power of the power battery itself is low, charging the lead-acid battery will be prohibited. Once the lead-acid battery runs out of power, it is necessary to activate or replace the lead-acid battery through an external 12V power supply. Summary of the Invention

[0003] The main purpose of the present invention is to propose a system for charging a lead-acid battery using a solar charging panel and its control method to solve the problem of power failure of the lead-acid battery caused by long-term parking in new energy vehicles at the present stage;

[0004] The low-voltage lead-acid battery charging system using solar energy proposed by the present invention mainly includes: a solar charging module, a body control module (BCM), a power battery system, and a remote interaction module;

[0005] Among them, the solar charging module mainly consists of a solar charging panel, an auxiliary battery, and a DC / DC converter;

[0006] Function of the solar charging module: When the light conditions meet the requirements, store electricity in the auxiliary battery inside the charging module or directly charge the low-voltage lead-acid battery;

[0007] The BCM needs to regularly wake up and check the voltage state of the lead-acid battery when the vehicle meets the static requirements. When it is judged that the small battery is out of power, it preferentially enables the solar charging module to charge the low-voltage lead-acid battery;

[0008] When the solar charging module cannot perform the charging function, the power battery module is used as an alternative to charge the low-voltage battery;

[0009] When neither the solar charging module nor the power battery module can charge the low-voltage lead-acid battery, the remote interaction module is used to remind the customer to charge in time. There is a risk of power failure in the vehicle, and the user can choose to start charging. Description of the Drawings

[0010] To more clearly illustrate the technical solutions described in the present invention, the described invention is illustrated using the accompanying drawings. The examples described in the drawings are only partial application examples of the strategies described in the invention. For an ordinary technician in the art, without creative efforts, more application solutions can be obtained based on the application examples;

[0011] Figure 1 is a system for replenishing power to a low-voltage lead-acid battery using solar energy proposed in the present invention;

[0012] Figure 2 is the overall process for replenishing power to a low-voltage lead-acid battery proposed in the present invention;

[0013] Figure 3 is the power replenishment strategy for a low-voltage lead-acid battery proposed in the present invention. Detailed implementation manners

[0014] In order to enable those skilled in the art of this technology to better understand the solutions described in the present invention, the technical solutions proposed in the invention will be clearly and completely described below in conjunction with the accompanying drawings. The examples described are only partial application examples of the present invention. Based on the solutions in the present invention, other application solutions obtained by ordinary technicians in the art without creative efforts should fall within the protection scope of the present invention.

[0015] The present invention provides a control strategy for replenishing power to a low-voltage lead-acid battery charged by solar energy, Figure 3 is the control flow chart of the power replenishment solution proposed in the present invention.

[0016] In the power replenishment system proposed in the present invention, the voltage state of the low-voltage lead-acid battery is collected and reported by the BCM;

[0017] The solar charging module only replenishes power according to the power replenishment request status of the body controller, and the charging of the solar charging system itself can be carried out at any time when the requirements are met;

[0018] The state of the power battery is detected and reported by the BMS, which should at least include the total voltage of the battery pack, the lowest single-cell voltage, the highest single-cell voltage, the lowest single-cell temperature, the highest single-cell temperature, the SOC, as well as the battery system fault status and the feedback on the power replenishment request;

[0019] The BCM only judges the feedback on the power replenishment request sent by the BMS and does not judge the state of the power battery;

[0020] The BCM wakes up regularly to detect the voltage of the low-voltage battery. When it is lower than the set threshold, it preferentially enables the solar charging module and sends a power replenishment request;

[0021] When the solar charging module receives the enable command and the charging request from the body control module, it feeds back to the body control module to allow charging and simultaneously charges the low-voltage lead-acid battery.

[0022] When the BCM does not receive the feedback of allowing charging from the solar charging module within a certain period of time, it wakes up the BMS and sends a charging request at the same time.

[0023] The BMS receives the wake-up signal from the BCM, first performs a wake-up self-check, and reports the current state of the battery pack.

[0024] The battery information reported by the BMS includes the current total voltage of the battery pack, SOC, the highest single-cell voltage, the lowest single-cell voltage, the lowest single-cell temperature, the highest single-cell temperature, etc.

[0025] The BMS determines that the current battery state meets the charging requirements and feeds back to the body control module: allowing charging; when it does not meet the charging requirements, the BMS feeds back: not allowing charging, and enters the sleep process.

[0026] When the BMS feeds back allowing charging, it powers on the high voltage and enables the DC.

[0027] After the BMS completes power-on, it starts to charge the lead-acid battery.

[0028] When the body control module triggers the stop charging condition or fails to meet the charging start condition, it sends a charging request status: stop charging.

[0029] During the charging process, charging is exited when the following conditions are met: a) The charging timer times out. b) The door is opened. c) Remote unlocking. d) Neither the solar charging module nor the power battery meets the charging requirements. e) The charging request status sent by the BCM is: stop charging. f) The charging request message sent by the BCM disappears / is lost.

[0030] When the conditions for exiting charging are met or the charging mode cannot be successfully entered, the body control module and other awakened ECUs delay entering the sleep mode.

[0031] When the charging timer times out, the body control module needs to send a charging request status: stop charging, and at the same time needs to detect the voltage of the low-voltage lead-acid battery again. If there is still a power shortage, secondary charging is allowed. After each charging, the body control module increments the charging success counter by 1. When the counter is greater than or equal to 3 and the low-voltage battery still has a power shortage, the user needs to be reminded through the remote interaction module that the state of the low-voltage battery is abnormal.

[0032] If the body control module detects no power feed when waking up at a fixed time and the voltage of the low-voltage lead-acid battery, the charging counter is incremented by 1. When the charging counter is greater than a certain value, the charging wake-up can be turned off according to user needs.

[0033] The beneficial effects of the present invention are that two charging methods, namely solar charging and high-voltage power battery charging, can effectively avoid power feed of the low-voltage lead-acid battery. At the same time, when there is a risk of power feed in the vehicle, the customer is reminded to charge in time through the remote interaction module. The customer can force the charging to start through the mobile APP according to the user's selection.

Claims

1. A method and system for charging a low-voltage lead-acid battery for a new energy vehicle, characterized in that: The supplementary power system includes a solar charging module, a conventional supplementary power system, and a remote interaction module.

2. The supplementary power supply system according to claim 1, wherein: Solar charging is preferably selected as the supplementary power method for lead-acid batteries.

3. The supplementary power system according to claim 1, characterized in that: Through the remote interaction system, the customer is reminded of the risk of battery power shortage.

4. The supplementary power supply strategy according to claim 1, wherein: When the solar supplementary power module cannot charge, the low-voltage lead-acid battery is supplemented with power by the power battery.

5. The replenishment power strategy according to claim 1, characterized in that: The supplementary power function or the power-off supplementary power function can be turned on according to the user's selection.

6. The supplementary power strategy according to claim 1, wherein: When the user's vehicle usage behavior is detected, the supplementary power is paused in a timely manner.

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