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SOH (state of health) estimation method for power battery

A technology for power batteries and battery packs, applied in battery/fuel cell control devices, electric vehicles, electric traction, etc., can solve problems such as inability to estimate power battery packs, impact on battery life, and large errors in estimation results

Active Publication Date: 2017-04-26
SHANGHAI GUOXUAN NEW ENERGY CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The main flaws are: there are limitations in use, and in the estimation process, full discharge will have a certain impact on the service life of the battery
The main defect is that the internal resistance of the battery will change significantly only when the charging capacity of the battery is reduced to about 70% to 80% of the original, which is different from the stipulated condition for the end of battery life that the battery capacity is reduced to 80%. There is a certain gap between them, and it is impossible to estimate the SOH of the whole life cycle of the power battery pack
The main disadvantages are: a lot of experiments and electrochemical theories are required in the process of establishing the chemical model of the battery, and the estimation process is long and difficult
The main disadvantages are: this method has high requirements for the consistency of the leasehold technology of the battery pack, and the test period of the experimental data is long, and the error of the estimation result is large

Method used

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  • SOH (state of health) estimation method for power battery
  • SOH (state of health) estimation method for power battery
  • SOH (state of health) estimation method for power battery

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Embodiment Construction

[0014] Combine below Figure 1 to Figure 3 Shown, the present invention is described in further detail.

[0015] Such as figure 1 As shown, this embodiment discloses a method for estimating the SOH of a power battery, which includes the following steps S1 to S3:

[0016] S1. Within the set temperature range, charge the battery pack in the discharge cut-off state to a fully charged state;

[0017] Specifically, the temperature range set in this embodiment can be 15°C to 25°C, and those skilled in the art can set different temperature ranges according to the actual situation to charge and discharge the battery pack, as long as the battery pack is located It is sufficient that the temperature environment has no obvious influence on the capacity of the battery pack.

[0018] S2. Calculate the maximum available total capacity of the battery pack according to the available capacity when the battery pack is in the cut-off state of discharge and the total charge capacity when it is...

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Abstract

The invention discloses an SOH (state of health) estimation method for a power battery and belongs to the technical field of power batteries. The method comprises the following steps of: charging a battery pack in a discharge cut-off state to a fully charged state in a set temperature range; calculating the maximum total available capacity of the battery pack according to available capacity of the battery pack in the discharge cut-off state and total charging capacity of the battery pack in the fully charged state; and estimating the SOH of the battery pack according to the total capacity of the battery pack and set initial nominal capacity. According to the method disclosed by the invention, the SOH of the battery pack is estimated by utilizing the inherent characteristic of the battery pack, namely the maximum total available capacity of the battery pack, an internal chemical model and state parameters of the battery pack do not need to be known, and the difficulties that mathematical modeling, state parameter identification and off-line test cannot be performed inside the battery, lots of experimental data are needed and the like are overcome, so that the SOH in the full life circle of the battery pack can be estimated, and an estimated object is not limited to the battery pack of a certain specific type of battery cells.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a power battery SOH estimation method. Background technique [0002] In the battery management system, the state of health (State Of Health, SOH) of the battery pack directly affects the practicability, economy, and safety of the lithium-ion battery pack. Therefore, manufacturers pay more and more attention to the research on the SOH of the battery pack. . [0003] At present, the methods for estimating the SOH of the battery pack mainly include: 1. The full discharge method, which is to estimate the SOH by fully discharging the battery pack under off-line conditions. The main disadvantages are: it has limitations in use, and in the estimation process, full discharge will have a certain impact on the service life of the battery. 2. Internal resistance method. This method uses the relationship between SOH and battery internal resistance to estimate SOH. The main defec...

Claims

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Application Information

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IPC IPC(8): B60L11/18
CPCB60L58/10Y02T10/70
Inventor 吴定国孙友涛胡攀攀唐晓新
Owner SHANGHAI GUOXUAN NEW ENERGY CO LTD
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