US-12627008-B2 - Battery for testing short circuit, manufacturing method therefor, and battery safety analysis method

Abstract

The present disclosure relates to a battery for testing a short circuit, a manufacturing method therefor, and a battery safety analysis method, which manufacture a battery for testing a short circuit, capable of easily switching to an internal short circuit state, and which analyze battery safety by using the battery.

Inventors

• Yongtae Kim

Assignees

• LG ENERGY SOLUTION, LTD.

Dates

Publication Date

20260512

Application Date

20220926

Priority Date

20211125

Claims (7)

1. 1 . A battery for short circuit inspection, comprising: a positive electrode including a positive electrode active material on a positive electrode current collector; a negative electrode including a negative electrode active material on a negative electrode current collector; a perforated separator between the positive electrode and the negative electrode and including a perforated hole; an auxiliary separator between the positive electrode and the negative electrode and covering the perforated hole; and a battery case accommodating the positive electrode, the negative electrode, the perforated separator, and the auxiliary separator therein, wherein, the positive electrode includes an active material-eliminated area, from which the positive electrode active material is eliminated, formed in an area that faces the perforated hole of the perforated separator, wherein one end of the auxiliary separator protrudes outside the battery case, and wherein the auxiliary separator is configured to be eliminated by pulling the one end of the auxiliary separator to apply a short circuit state to the battery for short circuit inspection.
2. 2 . The battery of claim 1 , wherein an area of the active material-eliminated area is greater than that of the perforated hole.
3. 3 . The battery of claim 1 , wherein materials of the perforated separator and the auxiliary separator comprise at least one selected from the group consisting of an ethylene monopolymer, propylene monopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer.
4. 4 . A method for manufacturing the battery for short circuit inspection of claim 1 , comprising: a step of preparing the positive electrode in which the positive electrode active material is applied to the positive electrode current collector and the negative electrode in which the negative electrode active material is applied to the negative electrode current collector; a step of eliminating the positive electrode active material on a part of the positive electrode to form the active material-eliminated area; a step of laminating the perforated separator having the perforated hole formed in a position facing the active material-eliminated area, to the positive electrode; a step of laminating the auxiliary separator to the perforated separator to cover the perforated hole; a step of laminating the negative electrode to the positive electrode with the perforated separator and the auxiliary separator interposed therebetween; and a step of sealing the battery for short circuit inspection after accommodating the positive electrode, the negative electrode, the perforated separator, and the auxiliary separator in the battery case.
5. 5 . The battery for short circuit inspection manufacturing method of claim 4 , wherein, in the step of eliminating positive electrode active material, the positive electrode active material is eliminated by washing with N-methyl-2-pyrrolidone (NMP).
6. 6 . A battery safety analysis method using the battery for short circuit inspection of claim 1 , comprising: a step of charging the battery for short circuit inspection; a short circuiting step by eliminating the one end of the auxiliary separator and bringing the positive electrode and the negative electrode into contact through the perforated hole; and a step of safety analyzing by measuring a state of charge (SOC) or temperature of the battery for short circuit inspection to analyze safety.
7. 7 . The battery safety analysis method of claim 6 , wherein, in the step of safety analyzing, the SOC or temperature of the battery for short circuit inspection is measured according to a time series.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is a National Phase entry pursuant to 35 U.S.C. § 371 of International Application No. PCT/KR2022/014318, filed on Sep. 26, 2022, and claims the benefit of and the priority to Korean Patent Application No. 10-2021-0163887, filed on Nov. 25, 2021, the entire contents of which is are hereby incorporated by reference in its their entirety. TECHNICAL FIELD The present disclosure relates to a battery for short circuit inspection, a manufacturing method thereof, and a battery safety analysis method, and to a battery for short circuit inspection that is easily switchable to an internal short circuit state, a manufacturing method thereof, and a battery safety analysis method in which battery safety is analyzed through the battery. BACKGROUND In general, a secondary battery, a battery that is repeatedly usable through a discharge process of converting chemical energy into electrical energy and a charging process performed in a reverse way, is highly compatible in accordance with product lines, and the secondary battery having electrical characteristics such as high energy density is universally applied to electric vehicles (EVs) or hybrid vehicles (HVs) driven by electric driving sources, in addition to portable devices. As the secondary battery is applied to various products, safety evaluation thereof is crucial because safety of the secondary battery is related to safety of products. There are various ways to evaluate safety of secondary batteries, one of which may be internal short circuit inspection performed under a condition in which a negative electrode and a positive electrode are in contact inside the secondary battery. The secondary battery may be short circuited by various internal and external environments, and, in case of short circuit, there may be the risk of ignition. Therefore, there is a need for a technology that may easily apply a short circuit state in the secondary battery to analyze safety of the secondary battery in a short circuit state. The background description provided herein is for the purpose of generally presenting context of the disclosure. Unless otherwise indicated herein, the materials described in this section are not prior art to the claims in this application and are not admitted to be prior art, or suggestions of the prior art, by inclusion in this section. Summary Technical Goals The present disclosure relates to a battery for short circuit inspection, a manufacturing method thereof, and a battery safety analysis method, and an object of the present disclosure is to provide a battery for short circuit inspection that is easily switchable to an internal short circuit state, a manufacturing method thereof, and a battery safety analysis method in which battery safety is analyzed through the battery. Technical objects to be achieved by the present disclosure are not limited to the technical problems mentioned above, and other technical objects not mentioned will be clearly understood from the description below by those of ordinary skill in the art to which the present disclosure pertains. Technical Solutions A battery for short circuit inspection of the present disclosure includes: a positive electrode including a positive electrode active material on a positive electrode current collector; a negative electrode including a negative electrode active material on a negative electrode current collector; a perforated separator between the positive electrode and the negative electrode and including a perforated hole; an auxiliary separator between the positive electrode and the negative electrode and covering the perforated hole; and a battery case accommodating the positive electrode, the negative electrode, the perforated separator, and the auxiliary separator therein, wherein, the positive electrode includes an active material-eliminated area, from which the positive electrode active material is eliminated, may be formed in an area that faces the perforated hole of the perforated separator. Advantageous Effects A battery for short circuit inspection of the present disclosure may apply a short circuit state in a secondary battery arbitrarily in a desired situation and enable analysis of safety of the secondary battery by applying a short circuit state in the secondary battery under various conditions such as SOC, temperature, and shock. In a battery safety analysis method of the present disclosure, it is possible to carry out safety analysis of the secondary battery by simulating a driving situation of a product to which the secondary battery is applied and applying a short circuit state. The battery safety analysis method of the present disclosure may easily check whether the battery is safe. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view illustrating the inside of a battery for short circuit inspection of the present disclosure. FIG. 2 is a plan view illustrating a state in which a positive electrode por