Method for improving output of lithium battery

Abstract

To provide a method for improving the output of a lithium battery, the method improving the output of the lithium battery by predicting a rapid change of situations in advance, thereby allowing a response to the rapid change of situations.SOLUTION: The method for improving the output of a lithium battery according to the present disclosure includes steps of: predicting generation of a large current in the lithium battery on the basis of a situation of inputting information into a navigation system by a user, and at least one of action histories of the user (S11); predicting whether degradation of polarization is to be generated in the lithium battery on the basis of the predicted large current (S12); and heating the lithium battery before the predicted timing of generation of the large current in a case where the degradation of polarization in the lithium battery is predicted (S13).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for improving the output of a lithium battery.

Background Art

[0002] Patent Document 1 describes a technique for suppressing the occurrence of concentration polarization without restricting the charge and discharge current of a battery by heating the battery when it is necessary to reduce the concentration polarization of the battery.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the technique of Patent Document 1 is a technique for eliminating the polarization phenomenon from the current battery state estimation, and in an electric vehicle or a hybrid vehicle, there is a problem that it is difficult to manage the battery for sudden changes when a user suddenly performs high-load driving.

Means for Solving the Problems

[0005] A method for improving the output of a lithium battery according to an embodiment predicts the occurrence of a large current in the lithium battery, and when polarization deterioration is predicted in the lithium battery based on the predicted large current, the lithium battery is heated before the timing of the occurrence of the predicted large current.

Effects of the Invention

[0006] According to the method for improving the output of a lithium battery of the present disclosure, the output of the lithium battery is improved by making a prior prediction for a sudden change in the situation, and the lithium battery can cope with a sudden change in the situation.

Brief Description of the Drawings

[0007]

Figure 1

Embodiments for Carrying Out the Invention

[0008] This embodiment Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a flowchart showing an example of a method for improving the output of a lithium battery according to this embodiment. Hereinafter, a method for improving the output of a lithium battery mounted on an electric vehicle or a hybrid vehicle will be described.

[0009] First, in step S11, for the lithium battery used by the user, it is predicted whether a large current will occur and the timing of its occurrence. Specifically, the first prediction method is a method of predicting large current conditions and timing that will occur in the future, such as slopes to the destination and highway merges, based on the information input by the user into the navigation device. The second prediction method is a method of predicting behavior from past driving patterns based on the user's behavior history and predicting large current conditions and timing. Then, it proceeds to step S12.

[0010] Next, in step S12, it is predicted whether polarization deterioration will occur in the lithium battery based on the predicted large current. If it is predicted that polarization deterioration will occur in the lithium battery, it proceeds to step S13. If it is predicted that polarization deterioration will not occur in the lithium battery, it proceeds to step S15.

[0011] In step S13, the lithium battery is heated. Heating can be realized by a general heating device such as a heater. Then, it proceeds to step S14.

[0012] In step S14, it is determined whether the vehicle is running without speed restrictions. If the vehicle is running without speed restrictions, it proceeds to step S15. If the vehicle is not running without speed restrictions, it returns to step S13.

[0013] In step S15, the lithium battery is cooled. The cooling can be realized by a general cooling device such as a heat sink. Then the process ends.

[0014] According to the method for improving the output of the lithium battery of the present embodiment, by heating the lithium battery before the polarization deterioration occurs, the insertion speed of lithium is increased, and the resistance does not increase rapidly at low SOC (State Of Charge), so that rapid polarization deterioration is not generated. As a result, the output of the lithium battery is improved, and an electric vehicle or a hybrid vehicle equipped with the lithium battery can run without user dissatisfaction.

[0015] Also, according to the method for improving the output of the lithium battery of the present embodiment, from future prediction, the cooling and heating of the lithium battery can be controlled at the required timing to maintain an optimal temperature state.

[0016] Note that the heating conditions are determined by monitoring the state (SOC, temperature) of the lithium battery with a BMS (Battery management system).

[0017] Moreover, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist. For example, each element described in the drawings as a functional block or flowchart for performing various processes can be configured by a CPU, a memory, and other circuits in terms of hardware, and can be realized by a program loaded into the memory or the like in terms of software. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware, software, or a combination thereof, and are not limited to any one of them.

[0018] In addition, the above-described program can be stored using various types of non-transitory computer-readable media and supplied to a computer. Non-transitory computer-readable media include various types of tangible recording media. Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROM (Read Only Memory), CD-R, CD-R / W, semiconductor memories (e.g., mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). Also, the program may be supplied to the computer by various types of transitory computer-readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable media can supply the program to the computer via wired communication paths such as electric wires and optical fibers, or wireless communication paths.

Claims

【Claim 1】 Predict the generation of a large current in a lithium battery based on at least one of the information input status of the user to the navigation device and the user's action history, Predict whether polarization deterioration occurs in the lithium battery based on the predicted large current, When polarization deterioration is predicted in the lithium battery, a method for improving the output of the lithium battery, which warms the lithium battery before the timing of the generation of the predicted large current.

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