A battery protection circuit and battery voltage sampling circuit thereof
A technology for protecting circuits and battery voltages, applied in emergency protection circuit devices, measuring current/voltage, measuring electricity, etc.
Active Publication Date: 2022-05-13
SHENZHEN ICM MICROELECTRONICS CO LTD
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Problems solved by technology
[0006] Based on this, it is necessary to provide a battery protection circuit and its battery voltage sampling circuit to solve the problem that the existing battery voltage sampling circuit collects the surge voltage and causes the subsequent detection circuit to be easily damaged.
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0035] In the first embodiment, if figure 1 As shown, a battery voltage sampling circuit of a battery protection circuit, the battery voltage sampling circuit includes a high voltage circuit 2 and a battery voltage detection circuit 3, wherein the high voltage terminal BATP of the high voltage circuit 2 is used to connect each The positive electrodes of the batteries connected in series, the low-voltage terminal BATN_PRE of the high-voltage circuit 2 i...
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The invention discloses a battery protection circuit and a battery voltage sampling circuit thereof, including a high-voltage-resistant circuit, the high-voltage end of which is used to connect the positive poles of batteries connected in series with each node through a battery selection switch, and the low-voltage end is used to connect each node through a battery selection switch. The negative poles of the batteries are connected in series, the high-voltage end is connected to the high-voltage input end of the battery voltage detection circuit, the low-voltage end is connected to the low-voltage input end of the battery voltage detection circuit through a controllable switch, and the control end of the high-voltage resistance circuit is connected to the controlled end of the controllable switch; The high-voltage circuit is used to receive the terminal voltage of each battery, compare the terminal voltage with the set withstand voltage threshold, when the terminal voltage is lower than the withstand voltage threshold, control the controllable switch to close, so that the battery voltage detection circuit can detect the voltage of each battery terminal voltage; when the terminal voltage is not lower than the withstand voltage threshold, the controllable switch is controlled to be disconnected, so that the battery voltage detection circuit cannot detect the terminal voltage of each battery, so as to protect the detection circuit and improve the withstand voltage of the battery voltage sampling circuit ability.
Description
technical field [0001] The invention relates to the technical field of emergency protection circuit devices, in particular to a battery protection circuit and a battery voltage sampling circuit thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in electrical tools, and multi-cell lithium battery packs increase the voltage and capacity by connecting single-cell lithium batteries in series / parallel to supply power for higher-power equipment. In order to ensure the safe operation of the battery pack, the battery pack must be equipped with a corresponding lithium battery protection board to monitor the battery voltage, charge and discharge current, and whether there is a disconnection. When the battery is charged and plugged in, or under the action of the flyback voltage of the instantaneous discharge circuit after the short-circuit protection of the battery is activated, there will inevitably be a surge voltage, and the surge voltage ...
Claims
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IPC IPC(8): H02H7/18G01R19/165G01R31/3835
CPCH02H7/18G01R19/16542G01R31/3835
Inventor 朱治鼎王蒙白青刚杨小华
Owner SHENZHEN ICM MICROELECTRONICS CO LTD