Balanced charging and discharging method for intelligent battery

Abstract

The invention discloses an intelligent battery equalization charging and discharging method, which comprises the following steps that: step 1, a battery pack equalization management system sets different corresponding SOH (state of health of a power battery) values according to different battery core materials and battery processes; 2, in the charging and discharging process of the power battery, obtaining the actual health state value of the power battery, and inputting the actual health state value into the battery pack balance management system; 3, the battery pack equalization management system analyzes and compares the actual health state value of the power battery with a set SOH (health state of health) value of the power battery, and judges whether equalization management needs to be carried out or not; and 4, if equalization management needs to be carried out, starting an equalization management mode, and adopting a corresponding equalization mode according to the health state of the power battery. According to the invention, different equalization control strategies are formulated in a complex and changeable environment, so that the efficiency of the battery is greatly utilized, and the safety of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of balanced charging and discharging of power batteries, and in particular to an intelligent battery balanced charging and discharging method. Background Art

[0002] At present, with the rapid development of the electric vehicle industry, the battery pack of new energy vehicles, as one of the most important technologies, has also developed rapidly. In the existing technology, new energy vehicles are prone to uneven charging and discharging of the battery pack due to inconsistent battery pack capacities, thereby reducing the performance and life of the entire battery pack, and even causing safety hazards. In order to solve this problem, technical personnel in this field generally solve this problem by adopting a balancing control method. Through energy transfer during the charging process, the charge state between each single battery pack is balanced, thereby improving the overall performance of the battery pack, effectively extending the battery life, and reducing safety hazards.

[0003] In the meantime, please refer to the attached Figure 1 As shown, the existing traditional balancing management method mainly achieves different balancing controls by setting different SOH (battery health status) values ​​according to the different battery cell materials and battery processes. However, the traditional balancing management method considers a single influencing factor and ignores the influence of complex and changeable driving environment, driving parameters, battery status, etc. on the balancing effect. It is impossible to consider the influence of different factors on balancing from multiple perspectives and angles in a complex and changeable environment.

[0004] To solve this problem, we designed an intelligent battery balanced charging and discharging method to solve this problem. Summary of the invention

[0005] In view of the above technical problems in the prior art, the present invention provides an intelligent battery balanced charging and discharging method to solve the problem of considering the impact of different factors on balance from multiple perspectives and angles in a complex and changeable environment, and formulating different balanced control strategies to make better use of the battery efficiency and improve battery safety.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An intelligent battery balanced charging and discharging method, comprising the following steps:

[0008] Step 1: The battery pack balancing management system sets different corresponding SOH (health status of power battery) values ​​according to different battery cell materials and battery processes;

[0009] Step 2: During the charging and discharging process of the power battery, the actual value of the health status of the power battery is obtained and input into the battery pack balancing management system;

[0010] Step 3: The battery pack balancing management system analyzes and compares the actual value of the health state of the power battery with the set SOH (health state of the power battery) value to determine whether balancing management is required;

[0011] Step 4: If balancing management is required, start the balancing management mode and adopt the corresponding balancing mode according to the health status of the power battery;

[0012] Step 5, the battery pack balancing management system records the parameter of the SOH value set according to the selected battery cell material as the first parameter; records the parameter of the SOH value set according to the selected battery process processing method as the second parameter; obtains the temperature difference between the battery pack and the environment, the current operating condition or the battery state of charge as the third parameter; the battery management system couples the first parameter, the second parameter, and the third parameter to perform balancing control and management on the power battery pack.

[0013] As a further elaboration 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 SOH value of the third parameter is divided into multiple intervals, and the battery pack balancing management system sets different SOH values ​​according to different values ​​of the third parameter interval, thereby issuing different balancing 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 balancing control instruction can be implemented by configuring different balancing duty cycles or gating control loop number balancing current and other parameters.

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

[0017] In the above technical solution, 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 power vehicle, and the type of power vehicle includes EV (pure electric), HEV (hybrid electric) or PHEV (plug-in hybrid electric).

[0018] Beneficial effects of the present invention:

[0019] The present invention is reasonably designed to solve the problem of power batteries in complex and changeable environments, and to consider the influence of different factors on the balance of power battery packs from multiple perspectives and angles, so as to formulate different balance control strategies to make better use of the battery efficiency and improve battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a balanced flow chart of the prior art;

[0021] Figure 2 A flow chart for obtaining a temperature difference between the battery pack and the environment as a third parameter;

[0022] Figure 3 is a flow chart of balancing with the current working condition recorded as the third parameter;

[0023] Figure 4 The figure is a flow chart of balancing in which the battery state of charge is recorded as the third parameter. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0025] Please refer to Figures 2 to 4 This embodiment provides a smart battery balanced charging and discharging method, which includes the following steps:

[0026] Step 1: The battery pack balancing management system sets different corresponding SOH (health status of power battery) values ​​according to different battery cell materials and battery processes;

[0027] Step 2: During the charging and discharging process of the power battery, the actual value of the health status of the power battery is obtained and input into the above-mentioned battery pack balancing management system;

[0028] Step 3: The battery pack balancing management system analyzes and compares the actual health status value of the power battery with the set SOH (power battery health status) value to determine whether balancing management is required;

[0029] Step 4: If balancing management is required, start the balancing management mode and adopt the corresponding balancing mode according to the health status of the power battery;

[0030] Step 5. The battery pack balancing management system records the parameter of the SOH value set according to the selected battery cell material as the first parameter; records the parameter of the SOH value set according to the selected battery process processing method as the second parameter; obtains the temperature difference between the battery pack and the environment, the current operating condition or the battery state of charge as the third parameter; the battery management system couples the first parameter, the second parameter, and the third parameter to perform balancing control and management on the power battery pack.

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

[0032] As a further improvement of the present invention, in step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the balancing control instruction can be implemented by configuring different balancing duty cycles or gating control loop number balancing current and other parameters.

[0033] As a further improvement of the present invention, in step 5, when the current operating condition is selected as the third parameter, the third parameter is set to different values ​​or intervals according to different classification types to formulate different balancing management modes. As a further improvement of the present invention, in step 5, when the battery state of charge is selected as the third parameter, the third parameter is differentiated and set according to the type of power vehicle, and the power vehicle type includes EV (pure electric), HEV (hybrid electric) or PHEV (plug-in hybrid).

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An intelligent battery balanced charging and discharging method, characterized in that: The following steps: Step 1: The battery pack balancing management system sets different corresponding SOH (health status of power battery) values ​​according to different battery cell materials and battery processes; Step 2: During the charging and discharging process of the power battery, the actual value of the health status of the power battery is obtained and input into the battery pack balancing management system; Step 3: The battery pack balancing management system analyzes and compares the actual value of the health state of the power battery with the set SOH (health state of the power battery) value to determine whether balancing management is required; Step 4: If balancing management is required, start the balancing management mode and adopt the corresponding balancing mode according to the health status of the power battery; Step 5, the battery pack balancing management system records the parameter of the SOH value set according to the selected battery cell material as the first parameter; records the parameter of the SOH value set according to the selected battery process processing method as the second parameter; obtains the temperature difference between the battery pack and the environment, the current operating condition or the battery state of charge as the third parameter; the battery management system couples the first parameter, the second parameter, and the third parameter to perform balancing control and management on the power battery pack.

2. The intelligent battery balanced charging and discharging method according to claim 1, characterized in that: In step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the SOH value of the third parameter is divided into multiple intervals. The battery pack balancing management system sets different SOH values ​​according to different values ​​of the third parameter interval, thereby issuing different balancing control instructions.

3. The intelligent battery balanced charging and discharging method according to claim 2, characterized in that: In step five, when the temperature difference between the battery pack and the environment is selected as the third parameter, the balancing control instruction can be implemented by configuring different balancing duty cycles or gating control loop number balancing current and other parameters.

4. The intelligent battery balanced charging and discharging method according to claim 1, characterized in that: In step five, when the current working condition is selected as the third parameter, different values ​​or interval ranges are set for the third parameter according to different division types to formulate different balancing management modes.

5. The intelligent battery balanced charging and discharging method according to claim 1, characterized in that: 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 power vehicle, which includes EV (pure electric), HEV (hybrid electric) or PHEV (plug-in hybrid electric).

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