Intelligent battery equalization charging and discharging method

Abstract

The application discloses a kind of intelligent battery equalization charge-discharge methods, with the following steps: step one, battery pack equalization management system is set according to the different SOH health state value of different corresponding of battery core material and battery technology;Step two, the health state actual value of power battery is obtained in the process of charge-discharge, and is input in the battery pack equalization management system;Step three, the health state actual value of power battery is compared by the battery pack equalization management system with the set SOH health state value, and it is judged whether it needs to carry out equalization management;Step four, if it needs to carry out equalization and equalization management, then start equalization management mode, and according to the health state of power battery, corresponding equalization mode is used.The application formulates different equalization control strategies in complex and changeable environment, to make greater use of the efficiency of battery, and improve battery safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power battery equalization charging and discharging, and particularly relates to an intelligent battery equalization charging and discharging method. BACKGROUND

[0002] At present, with the rapid development of the electric vehicle industry, the battery pack of a new energy vehicle as one of the most important technologies also develops rapidly. In the prior art, the battery pack of a new energy vehicle is prone to inconsistent capacity, thereby leading to unbalanced charging and discharging of the battery pack, thereby reducing the performance and service life of the entire battery pack, and even causing safety hazards. In order to solve this problem, the technical personnel in the field generally solve this problem by using an equalization control method. Through energy transfer in the charging process, the charge states of each single battery pack are balanced, thereby improving the overall performance of the battery pack, effectively prolonging the service life of the battery, and reducing safety hazards.

[0003] At the same time, please refer to the accompanying drawings Figure 1 It is shown that the existing traditional equalization management method mainly sets different SOH (state of health of battery) values according to different battery materials and battery processes to realize different equalization controls. However, the traditional equalization management method considers only a single influencing factor and ignores the influence of complex and changeable driving environments, driving parameters, and the state of the battery itself on the equalization implementation effect. Therefore, the traditional equalization management method cannot consider the influence of different factors on equalization in multiple directions and multiple angles in a complex and changeable environment.

[0004] In order to solve this problem, the present application provides an intelligent battery equalization charging and discharging method, thereby solving this problem. SUMMARY

[0005] In view of the above technical problems existing in the prior art, the present application provides an intelligent battery equalization charging and discharging method, which solves the problem of considering the influence of different factors on equalization in multiple directions and multiple angles in a complex and changeable environment, formulates different equalization control strategies, and improves the safety of the battery by making greater use of the performance of the battery.

[0006] To achieve the above object, the present application provides the following technical scheme:

[0007] An intelligent battery equalization charging and discharging method includes the following steps:

[0008] Step 1: The battery pack equalization management system sets different corresponding SOH health state values according to different battery materials and battery processes.

[0009] Step 2: In the charging and discharging process of the power battery, the actual value of the health state of the power battery is obtained and input into the battery pack equalization management system.

[0010] Step three, the battery pack equalization management system compares the actual value of the state of health of the power battery with the set SOH health state value, and judges whether equalization management is needed;

[0011] Step four, if equalization management is needed, the equalization management mode is started, and the corresponding equalization mode is adopted according to the state of health of the power battery;

[0012] Step five, the battery pack equalization management system sets the parameter of the SOH value of the power battery according to the selected cell material as a first parameter, sets the parameter of the SOH value according to the selected battery process processing method as a second parameter, and obtains any one parameter of the temperature difference between the battery pack and the environment, the current working condition and the state of charge of the battery as a third parameter; the battery pack equalization management system couples the first parameter, the second parameter and the third parameter to perform equalization control management on the power battery pack.

[0013] As a further description of the above technical solution:

[0014] In the above technical solution, in step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the third parameter SOH value is divided into multiple intervals, and the battery pack equalization management system sets different SOH values according to the different third parameter interval values, thereby issuing different equalization control instructions.

[0015] In the above technical solution, in step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the equalization control instruction can be realized by configuring different equalization duty cycles or selecting different numbers of control loop equalization current parameters.

[0016] In the above technical solution, in step five, when the current working condition is selected as the third parameter, the third parameter sets different values or interval ranges according to different division types to formulate different equalization management modes.

[0017] In the above technical solution, in step five, when the state of charge of the battery is selected as the third parameter, the third parameter is set according to the type of the power automobile, and the type of the power automobile includes EV pure electric, HEV hybrid electric or PHEV plug-in hybrid.

[0018] The beneficial effects of the present application are:

[0019] The present application has reasonable design, solves the influence of different factors on the equalization of the power battery pack in a complex and changeable environment from multiple directions and angles, thereby formulating different equalization control strategies to make greater use of the efficiency of the battery and improve the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The equalization flow chart of the prior art;

[0021] Figure 2 The equalization flow chart taking the temperature difference between the battery pack and the environment as the third parameter;

[0022] Figure 3 The equalization flow chart taking the current working condition as the third parameter;

[0023] Figure 4 The equalization flow chart taking the state of charge of the battery as the third parameter. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to specific embodiments and drawings.

[0025] Please refer to Figures 2 to 4 The present embodiment provides an intelligent battery equalization charging and discharging method, which comprises the following steps:

[0026] Step one, the battery pack equalization management system sets different corresponding SOH health state values according to different cell materials and battery processes;

[0027] Step two, the health state actual value of the power battery is obtained during the charging and discharging process of the power battery and is input into the above-mentioned battery pack equalization management system;

[0028] Step three, the battery pack equalization management system analyzes and compares the health state actual value of the power battery with the set SOH health state value to determine whether equalization management is needed;

[0029] Step four, if equalization management is needed, the equalization management mode is started, and the corresponding equalization mode is adopted according to the health state of the power battery;

[0030] Step five, the battery pack equalization management system sets the SOH value parameter of the power battery according to the selected cell material as the first parameter, sets the SOH value parameter of the power battery according to the selected battery process processing method as the second parameter, and sets any one of the temperature difference between the battery pack and the environment, the current working condition and the state of charge of the battery as the third parameter; the battery pack equalization management system couples the first parameter, the second parameter and the third parameter to perform equalization control management on the power battery pack.

[0031] As a further improvement of the present application, when the temperature difference between the battery pack and the environment is selected as the third parameter in step five, the SOH value of the third parameter is divided into multiple intervals, and the battery pack equalization management system sets different SOH values according to the different interval values of the third parameter, thereby issuing different equalization control instructions.

[0032] As a further improvement of the present application, in step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the above-mentioned balancing control instruction can be realized by configuring different balancing duty cycles or gating control loop numbers of balancing current, etc.

[0033] As a further improvement of the present application, in step five, when the current working condition is selected as the third parameter, the above-mentioned third parameter is set to different values or interval ranges according to different classification types to formulate different balancing management modes. As a further improvement of the present application, in step five, when the battery state of charge is selected as the third parameter, the above-mentioned third parameter is set according to different types of electric vehicles, including EV pure electric, HEV hybrid electric or PHEV plug-in hybrid.

[0034] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0035] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection mode in the prior art, which will not be described in detail here.

[0036] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0037] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited to the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A method for intelligent battery equalization charging and discharging, characterized in that, The following steps are: Step one, the battery pack equalization management system sets different corresponding SOH health state values according to different battery materials and battery processes; Step two, during the charging and discharging process of the power battery, the actual value of the health state of the power battery is obtained and input into the battery pack equalization management system; Step three, the battery pack equalization management system compares the actual value of the health state of the power battery with the set SOH health state value to determine whether equalization management is needed; Step four, if equalization management is needed, the equalization management mode is started, and the corresponding equalization mode is adopted according to the health state of the power battery; Step five, the battery pack equalization management system sets the SOH value parameter of the selected battery material as the first parameter, sets the SOH value parameter of the selected battery process as the second parameter, and sets any one of the temperature difference between the battery pack and the environment, the current working condition, and the battery state of charge as the third parameter; the battery pack equalization management system couples the first parameter, the second parameter, and the third parameter to perform equalization control management on the power battery pack; In step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the third parameter SOH value is divided into multiple intervals, and the battery pack equalization management system sets different SOH values according to the different third parameter interval values to issue different equalization control instructions; In step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the equalization control instruction can be realized by configuring different equalization duty cycles or selecting different number of gating control loops to equalize the current; In step five, when the current working condition is selected as the third parameter, the third parameter sets different values or interval ranges according to different division types to formulate different equalization management modes; In step five, when the battery state of charge is selected as the third parameter, the third parameter is set according to the type of the power automobile, and the type of the power automobile includes EV pure electric, HEV hybrid electric, or PHEV plug-in hybrid.

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