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Electric vehicle battery protection method and device

A technology of electric vehicle battery and protection device, which is applied in the field of circuits, can solve problems such as battery short circuit, and achieve the effect of preventing battery positive and C-short circuit

Pending Publication Date: 2022-01-28
深圳市嘉佰达电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The primary purpose of the present invention is to provide a battery protection method for electric vehicles, which solves potential safety problems such as battery positive and C- short circuit, charging and discharging at the same time, charging port used for discharging, and charger that can continue to charge after the green light is turned on.

Method used

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  • Electric vehicle battery protection method and device
  • Electric vehicle battery protection method and device

Examples

Experimental program
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Embodiment 1

[0075] This embodiment provides an electric vehicle battery protection method, such as figure 1 shown, including steps:

[0076] When the charging circuit is not connected to the charger, the voltage of the charging circuit is pulled up to the voltage of the battery of the electric vehicle, and through the first protection sub-circuit and the second protection sub-circuit, the NMOS tube in the load circuit is turned on to allow discharge;

[0077] After the charging circuit is connected to the charger, the charging circuit is at a low level, and the NMOS tube in the load circuit is turned off through the first protection sub-circuit and the second protection sub-circuit, and cannot be discharged;

[0078] The user uses the charging port as a discharge port due to improper use or wrong wiring. At this time, there is no current on the current-sensing resistor, the comparator sub-circuit outputs a low level, and the NMOS tube M5 of the charging circuit is cut off, unable to disch...

Embodiment 2

[0080] An electric vehicle battery protection device, which protects the charging of the electric vehicle battery. The electric vehicle battery is connected in parallel with the load circuit and the charging circuit respectively. The load circuit includes a load and an NMOS tube MD5, and one end of the load is connected to the positive pole of the electric vehicle battery. The other end of the load is electrically connected to the drain of the NMOS tube MD5. The charging circuit includes a charger, an NMOS tube MC1 and an NMOS tube M5. One end of the charger is connected to the positive electrode of the electric vehicle battery. connected, the other end of the charger is electrically connected to the source of the NMOS transistor MC1, the drain of the NMOS transistor MC1 is electrically connected to the drain of the NMOS transistor M5, as figure 2 As shown, the electric vehicle battery protection device uses the electric vehicle battery protection method described in Embodimen...

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Abstract

The invention discloses an electric vehicle battery protection method and device. The method comprises the steps: the voltage of a charging loop is pulled up to the voltage of an electric vehicle battery when the charging loop is not connected with a charger, an NMOS tube in a load loop is turned on through a first protection sub-circuit and a second protection sub-circuit, and the discharge is allowed; after the charging loop is connected to a charger, the charging loop is at a low level, and the NMOS transistor in the load loop is closed and cannot discharge through the first protection sub-circuit and the second protection sub-circuit; and when a user improperly uses or wrongly connects wires, the charging port is used as a discharging port, at the moment, no current exists on the current detection resistor, the comparator sub-circuit outputs low level, and the NMOS tube M5 of the charging loop is cut off and cannot discharge. The method solves the problem of various potential safety hazards during battery charging.

Description

technical field [0001] The present invention relates to the field of circuits, and more specifically, to a method and device for protecting an electric vehicle battery. Background technique [0002] Due to the weak safety awareness of electric vehicle owners, mixed use of chargers of different powers for long-term charging, and the lack of safety of electric vehicle chargers themselves, various safety accidents have occurred. In July 2020, a new national standard charger was introduced. . However, there are still some potential safety hazards, such as the primary protection failure, the battery is short-circuited with C-, the split board is charging and discharging at the same time, the charging port is misused for discharging, and the charger is still charging after the green light is turned on. [0003] The publication date is March 2, 2016, and the Chinese patent with the publication number CN205070527U discloses a battery charging and discharging protection circuit and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00B60L58/10
CPCH02J7/0029H02J7/00712H02J7/0068B60L58/10Y02T10/70
Inventor 陆长城王礼刚
Owner 深圳市嘉佰达电子科技有限公司