Battery cell scanning circuit and method for battery protection chip
A technology for protecting chips and scanning circuits, which is applied in the electronic field and can solve the problems of large voltage jumps at positive and negative terminals, and achieve the effects of reducing voltage jumps, increasing scanning rates, and reducing time
Active Publication Date: 2015-01-28
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
[0007] The purpose of the present invention is to provide a cell scanning method for a battery protection chip to solve the problem that the positive and negative terminal voltage of the battery protection chip has a large jump range
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[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] In order to facilitate the understanding of the embodiments of the present invention, further explanations will be given below with specific embodiments in conjunction with the accompanying drawings, which are not intended to limit the embodiments of the present invention.
[0052] Below to figure 2 As an example, the cell scanning m...
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The invention relates to a battery cell scanning circuit and method for a battery protection chip. The method comprises the steps that a gating device enables corresponding battery cells to be connected according to preset gating rules; the preset gating rules comprise that the absolute value of the potential difference between the positive electrode of the currently connected battery cell and the positive electrode of the next connected battery cell is smaller than or equal to a first threshold value, and the absolute value of the potential difference between the positive electrode of the currently connected battery cell and the positive electrode of the former connected battery cell is smaller than or equal to the first threshold value; a part of or all the battery cells will be connected one by one; the connected battery cell will be connected again after a period of time; a detection circuit detects the voltage of the currently connected battery cell. According to the embodiment of the battery cell scanning circuit and method for the battery protection chip, the voltage jump amplitude between the positive end and the negative end of the detection circuit is reduced, the time for the detection circuit to establish a stable working point is shortened, and detection precision is improved.
Description
technical field [0001] The invention relates to the field of electronics, in particular to a cell scanning circuit and method for a battery protection chip. Background technique [0002] In industries such as electric bicycles and electric vehicles that require the use of battery protection chips, multiple batteries are often connected in series and in parallel to provide a sufficiently high voltage and a sufficiently large current. [0003] In battery protection chips, common voltage detection methods include continuous detection and scanning detection. Among them, the continuous detection method has a detection circuit for each cell voltage to work continuously. The advantage is that each cell voltage can be detected in real time without scanning errors, but the disadvantage is that the power consumption of multiple detection circuits is high, so The area occupied is large; the scanning detection method is to multiplex a detection circuit according to a certain scanning s...
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IPC IPC(8): H02H7/18
Inventor 张勇尹航王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD