Method and system for diagnosing connection state of battery pack loop, management system and vehicle

A technology of circuit connection and battery pack, which is applied in the field of vehicles, can solve the problems of deviation in the diagnosis of high-voltage circuit connection status and failure of proportional relationship, and achieve the effect of avoiding failure of proportional relationship and improving reliability

Active Publication Date: 2021-11-16
BYD CO LTD
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Problems solved by technology

It can be seen that the estimated internal resistance of the battery will become an order of magnitude higher than that at normal temperature, which will invalidate the fixed proportional rel

Method used

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Example Embodiment

[0032] Embodiments of the present invention is described in detail, with reference to the embodiments described are exemplary, embodiments of the present invention are described in detail below.

[0033] In the related art, as the environmental change and aging resistance of the battery itself will change to a fixed ratio between the total resistance of the initial battery internal resistance and the diagnosis of the connection state high voltage circuit, there will be inaccurate, and further, if too relaxed multiple of the initial total battery resistance R1 and the resistor R0, such as to improve the initial resistance R1, i.e., the power increase threshold value comparison circuit, not cause problems to quickly determine the connection resistance increased power circuit.

[0034] In order to solve the above problem, the following reference Figure 1 - Figure 4 The method of diagnosis of the battery pack power circuit of the embodiment described in accordance with a connection state

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Abstract

The invention provides a method and a system for diagnosing a power connection state of a battery pack, a storage medium, a battery management system and a vehicle. The method comprises the following steps: acquiring a detection signal of the battery pack and a detection signal of each battery cell in the battery pack; obtaining a cell internal resistance value of each cell according to the detection signal of the battery pack and the detection signal of each cell in the battery pack, obtaining a first whole-pack internal resistance value of the battery pack according to the cell internal resistance value of each cell and a total connection resistance value of the battery pack, and obtaining a second whole-pack internal resistance value of the battery pack according to the detection signal of the battery pack; and determining the power loop connection state of the battery pack according to the first whole pack internal resistance value at the current moment, the first whole pack internal resistance value at the previous moment, the second whole pack internal resistance value at the current moment and the second whole pack internal resistance value at the previous moment. According to the method for diagnosing the connection state of the power loop of the battery pack, the real-time performance and reliability of power loop diagnosis are improved by comparing the internal resistance values of the two whole packs in real time.

Description

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Claims

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Application Information

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Owner BYD CO LTD
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