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Method for managing low-voltage lithium battery of electric vehicle and method for switching power supply of whole vehicle

A technology for electric vehicles and management methods, applied in electric vehicle charging technology, electric vehicles, battery/fuel cell control devices, etc., can solve the problems of lead-acid batteries without monitoring and protection circuits, power instability, and battery power loss.

Active Publication Date: 2021-07-06
HOZON NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the same fully charged lithium battery and battery, at the same temperature, using different rates of discharge current, the discharge output characteristics of the lithium battery are very stable, while the discharge output characteristics of the battery are very different, which will cause power instability.
Moreover, there is no monitoring and protection circuit inside the lead-acid battery, and the battery often loses power.

Method used

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  • Method for managing low-voltage lithium battery of electric vehicle and method for switching power supply of whole vehicle
  • Method for managing low-voltage lithium battery of electric vehicle and method for switching power supply of whole vehicle
  • Method for managing low-voltage lithium battery of electric vehicle and method for switching power supply of whole vehicle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a management method for a low-voltage lithium battery of an electric vehicle, such as figure 1 shown, including steps:

[0039] S1. Determine whether the battery sensor IBS is awakened, if so, execute step S3; if not, execute step S2;

[0040] S2. Determine whether the preset timing wake-up time has arrived, if so, execute step S3;

[0041] S3. Obtain the data information related to the low-voltage lithium battery monitored by the battery sensor IBS, and judge whether the acquired data information related to the low-voltage lithium battery is normal, and if so, do not process; if not, execute step S4;

[0042] S4. Send abnormal information to the vehicle controller VCU, and perform corresponding processing.

[0043] This embodiment proposes a low-voltage lithium battery management system that replaces traditional lead-acid starter batteries. Among them, the low-voltage lithium battery uses a power battery. The low-voltage lithium battery man...

Embodiment 2

[0070] This embodiment provides a method for switching a low-voltage power supply for a vehicle, which is based on a management method for a low-voltage lithium battery of an electric vehicle in the embodiment, such as figure 2 shown, including steps:

[0071] A1. Load the working mode of the whole vehicle;

[0072] A2. Determine whether the loaded working mode is the long battery life mode, if so, perform step A3; if not, perform step A5;

[0073] A3. Turn off the output of DCDC, and use a low-voltage lithium battery to provide low-voltage power for the vehicle;

[0074] A4. Determine whether the SOC of the low-voltage lithium battery is greater than the second preset threshold, if so, continue to perform step A3; if not, then perform step A5;

[0075] A5. Turn on the output of DCDC, use DCDC to provide low-voltage electric energy for the whole vehicle, and switch the working mode of driving to long-life mode.

[0076] In this embodiment, a vehicle equipped with a low-vol...

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PUM

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Abstract

The invention discloses a method for managing a low-voltage lithium battery of an electric vehicle, which comprises the following steps of: S1, judging whether a battery sensor IBS is awakened or not, and if so, executing the step S3; if not, executing the step S2; s2, judging whether preset timed wake-up time arrives or not, and if yes, executing a step S3; s3, collecting data information related to the low-voltage lithium battery monitored by the battery sensor IBS, and judging whether the collected data information related to the low-voltage lithium battery is normal or not, if so, not processing; if not, executing the step S4; and S4, abnormal information is sent to a vehicle control unit (VCU), and corresponding processing is carried out. The low-voltage lithium battery protection board is used for monitoring and protecting the low-voltage lithium battery of the vehicle, and the safety and reliability of the lithium battery in the working process are ensured. The problem of under-voltage caused by long-term standing of the lithium battery is avoided through timing monitoring and intelligent charging functions.

Description

technical field [0001] The invention relates to the technical field of battery management of new energy vehicles, in particular to a management method of a low-voltage lithium battery of an electric vehicle and a method for switching power sources of the whole vehicle. Background technique [0002] At present, most new energy pure electric vehicles use traditional lead-acid batteries to provide starting and low-voltage power supply for the whole vehicle. [0003] The energy density of lead-acid batteries is low. Under the same capacity, the weight of lead-acid batteries is 3 to 5 times that of lithium batteries, and lithium batteries are 30% smaller than batteries. The service life of lithium batteries is about 3-6 times that of lead-acid batteries. For the same fully charged lithium battery and storage battery, at the same temperature, using different rates of discharge current, the discharge output characteristics of the lithium battery are very stable, while the discharg...

Claims

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Application Information

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IPC IPC(8): B60L58/12B60L58/10B60L53/00B60L58/27
CPCB60L58/12B60L58/10B60L53/00B60L58/27B60L2240/547B60L2240/545B60L2240/54Y02T10/70Y02T10/7072Y02T90/14
Inventor 王忠民肖江
Owner HOZON NEW ENERGY AUTOMOBILE CO LTD