Electric vehicle and battery management system and fault detection method thereof
A battery management system and fault detection technology, applied in the field of invention, can solve problems such as battery information loss, battery overcharging, and user experience degradation
Active Publication Date: 2017-06-09
BYD CO LTD
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- Description
- Claims
- Application Information
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Problems solved by technology
[0002] The battery management system of electric vehicles connects the battery with the sampling harness to obtain relevant information about the battery. The reliability of the connecting harness is directly related to battery monitoring, management strategies and battery safety. When the wiring harness connection fails, the battery may be overcharged and overcharged. put
[0003] The related technology judges the reliability by detecting whether the wiring harness is disconnected, and limits the power range and power of the battery used by the whole vehicle after a disconnection fault is found.
However, since the fault can only be found when the wiring harness is disconnected, the relevant battery information will be lost after the disconnection fault is detected, and the user experience will be greatly reduced by limiting the vehicle performance to avoid battery safety issues
Method used
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Embodiment Construction
[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0018] The fault detection method of the battery management system, the battery management system and the electric vehicle according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
[0019] according to figure 2 As an example, the battery management system 100 includes N battery cells 10, N balancing units 20, and N sampling units 30, and the N battery cells 10 are connected in series in sequence; each balancing unit 20 in the N balancing units 20 passes The wire ...
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The invention discloses an electric vehicle and a battery management system and a fault detection method thereof. The method comprises the following steps: each balance unit is controlled to be in a closed state, and initial voltage sampled by a sampling unit corresponding to each cell is acquired; the balance unit corresponding to the first cell is controlled to be in an opened state, balance voltage sampled by a sampling unit corresponding to the first cell and auxiliary voltage sampled by a sampling unit sampled by a second cell are acquired, and thus, connection resistance corresponding to the first cell is calculated; balance units corresponding to cells from the second to an Nth are sequentially controlled to be in opened states, and when the ith cell is opened, the balance voltage sampled by the sampling unit corresponding to the ith cell is acquired, and thus, connection resistance corresponding to the ith cell is calculated; and early warning information is generated when the change rate of any connection resistance is larger than a preset threshold, and thus, the warning information is transmitted in advance at an early stage when reliability of harness connection becomes poor.
Description
technical field [0001] The present invention relates to the technical field of the invention, in particular to a fault detection method of a battery management system, a battery management system and an electric vehicle. Background technique [0002] The battery management system of electric vehicles connects the battery with the sampling harness to obtain relevant information about the battery. The reliability of the connecting harness is directly related to battery monitoring, management strategies and battery safety. When the wiring harness connection fails, the battery may be overcharged and overcharged. put. [0003] The related technology judges the reliability by detecting whether the wiring harness is disconnected, and limits the power range and power of the battery used by the whole vehicle after a disconnection fault is found. However, since the fault can only be found when the wiring harness is disconnected, the relevant battery information will be lost after the...
Claims
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IPC IPC(8): H02J7/00B60L11/18H01M10/48G01R31/36
CPCB60L53/00B60L58/12B60L58/22G01R31/3842H01M10/482H01M10/486H02J7/0016H02J7/0021H02J2007/0067Y02E60/10Y02T10/70Y02T10/7072Y02T90/12Y02T90/14
Inventor 倪琰
Owner BYD CO LTD