JP2013190292A - Device and method for inspecting batteries - Google Patents

Device and method for inspecting batteries Download PDF

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JP2013190292A
JP2013190292A JP2012056159A JP2012056159A JP2013190292A JP 2013190292 A JP2013190292 A JP 2013190292A JP 2012056159 A JP2012056159 A JP 2012056159A JP 2012056159 A JP2012056159 A JP 2012056159A JP 2013190292 A JP2013190292 A JP 2013190292A
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battery
self
discharge
voltage drop
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JP6038467B2 (en
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Yoshio Matsuyama
嘉夫 松山
Kyoku Kobayashi
極 小林
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

PROBLEM TO BE SOLVED: To provide a battery inspection device with improved accuracy in determining short-circuited defective batteries.SOLUTION: A controller 50 lets a voltage measurement device 20 measure voltage of each of lithium ion secondary batteries 10, 10, ... as a pre self-discharge voltage E0, allows the lithium ion secondary batteries 10, 10, ... to self-discharge, lets the voltage measurement device 20 measure the voltage of each of the lithium ion secondary batteries 10, 10, ... after lapse of an arbitrary period from the self-discharge as a post self-discharge voltage E1, and determines whether each of the lithium ion secondary batteries 10, 10, ... is a short-circuit defective on the basis of a voltage drop deviation ΔE-ΔEm at reference time Ts which is a difference between a voltage drop value ΔE representing a difference between the post self-discharge voltage E1 and the pre self-discharge voltage E0 of one lithium ion secondary battery 10, and a median value ΔEm of the voltage drop values ΔE of all the lithium ion secondary batteries 10, 10, ...

Description

本発明は、電池が短絡している不良品であるかどうかを判定する電池の検査装置及び電池の検査方法の技術に関する。   The present invention relates to a battery inspection apparatus and a battery inspection method for determining whether a battery is a defective product that is short-circuited.

リチウムイオン二次電池等の二次電池では、金属等の異物混入により内部短絡が発生することがある。二次電池が短絡（内部短絡及び外部短絡を含む）している不良品であると判定する方法として、電池を自己放電させて、基準時間の電圧降下量を測定する検査方法が知られている（例えば、特許文献１）。   In a secondary battery such as a lithium ion secondary battery, an internal short circuit may occur due to contamination of foreign substances such as metal. As a method for determining that a secondary battery is a defective product short-circuited (including an internal short-circuit and an external short-circuit), an inspection method is known in which a battery is self-discharged and a voltage drop amount at a reference time is measured. (For example, patent document 1).

図４を用いて、電圧降下量ΔＥについて説明する。
なお、図４では、電圧降下量ΔＥをグラフ図（横軸は時系列Ｔであって右側に向かうに従って時間が経過し、縦軸は電圧降下量ΔＥであって下側に向かうほど電圧降下量ΔＥが多くなる）によって表している。 The voltage drop amount ΔE will be described with reference to FIG.
In FIG. 4, the voltage drop amount ΔE is a graph (the horizontal axis is time series T and time elapses toward the right side, and the vertical axis is the voltage drop amount ΔE, and the voltage drop amount decreases toward the lower side. ΔE increases).

特許文献１に開示される従来の代表的な電池の検査方法では、自己放電前電圧Ｅ０と自己放電後電圧Ｅ１との差である電圧降下量ΔＥによって近似線（図４における実線）を作成し、作成した近似線によって基準時間Ｔｓにおける電圧降下量ΔＥを算出し、算出した電圧降下量ΔＥに基づいて、電池が短絡している不良品であるかどうかを判定している。   In the conventional typical battery inspection method disclosed in Patent Document 1, an approximate line (solid line in FIG. 4) is created by a voltage drop amount ΔE which is the difference between the pre-self-discharge voltage E0 and the post-self-discharge voltage E1. The voltage drop amount ΔE at the reference time Ts is calculated from the created approximate line, and it is determined whether the battery is a defective product that is short-circuited based on the calculated voltage drop amount ΔE.

しかし、実際の電圧挙動（図４における破線）と近似線とには乖離があるため、検査を行う二次電池の自己放電前の測定タイミングＴ０から自己放電後の測定タイミングＴ１までの経過時間（放電時間Ｔｒ）と、良否判定基準の電圧降下量の経過時間（基準時間Ｔｓ）とが異なる場合には、正確な良否判定ができない。放電時間Ｔｒと基準時間Ｔｓとが異なる場合としては、例えば、工場の休業時間（土日祝等）に電圧測定装置を作動できない場合、或いは、電圧測定装置のサイクルタイムによって基準時間Ｔｓ経過後に電圧測定できない場合等が考えられる。   However, since there is a difference between the actual voltage behavior (broken line in FIG. 4) and the approximate line, the elapsed time from the measurement timing T0 before self-discharge of the secondary battery to be inspected to the measurement timing T1 after self-discharge ( When the discharge time Tr) is different from the elapsed time (reference time Ts) of the voltage drop amount based on the pass / fail criterion, an accurate pass / fail judgment cannot be made. Examples of the case where the discharge time Tr and the reference time Ts are different include, for example, the case where the voltage measuring device cannot be operated during the factory closing time (Saturdays, Sundays, holidays, etc.), or the voltage measurement after the reference time Ts has elapsed due to the cycle time of the voltage measuring device The case where it cannot be considered.

一方、電圧の測定ポイントを増やすことによって、実際の電圧挙動に近い近似線を作成することができるものの、実際の検査工程では電圧測定装置のサイクルタイム又はコスト等の都合によって２点のみしか測定できない。そのため、電池の検査方法では、短絡している不良品の判定精度を向上することが求められている。   On the other hand, although an approximate line close to the actual voltage behavior can be created by increasing the voltage measurement points, only two points can be measured in the actual inspection process due to the cycle time or cost of the voltage measurement device. . Therefore, in the battery inspection method, it is required to improve the determination accuracy of defective products that are short-circuited.

特開２０１１−０１８４８２号公報JP 2011-018482 A

本発明の解決しようとする課題は、短絡している不良品の判定精度を向上できる電池の検査装置及び電池の検査方法を提供することである。   The problem to be solved by the present invention is to provide a battery inspection apparatus and a battery inspection method capable of improving the determination accuracy of a defective product that is short-circuited.

本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段を説明する。   The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

即ち、請求項１においては、電池が短絡している不良品であるかどうかを判定する電池の検査装置であって、前記電池を充電する充電装置と、前記電池の電圧を測定する電圧測定装置と、前記電池が良品であるかどうかを判定する制御装置と、を具備し、前記制御装置は、前記充電装置によって前記電池を充電し、前記電圧測定装置によって前記電池の電圧を自己放電前電圧として測定し、前記電池を自己放電させ、前記電圧測定装置によって前記電池の自己放電から任意時間経過後の電圧を自己放電後電圧として測定し、基準時間における、一の電池の前記自己放電前電圧から前記自己放電後電圧の差である電圧降下量と、各電池の前記電圧降下量の中央値との差である電圧降下量偏差に基づいて、前記一の電池が短絡している不良品であるかどうかを判定するものである。   That is, in claim 1, a battery inspection device that determines whether or not a battery is a defective product that is short-circuited, a charging device that charges the battery, and a voltage measurement device that measures the voltage of the battery. And a control device for determining whether or not the battery is a non-defective product, wherein the control device charges the battery by the charging device, and the voltage measuring device converts the voltage of the battery to a voltage before self-discharge. The self-discharge of the battery, the voltage after the arbitrary time has elapsed from the self-discharge of the battery is measured as the post-self-discharge voltage by the voltage measuring device, the voltage before the self-discharge of one battery at a reference time A defective product in which the one battery is short-circuited based on a voltage drop amount deviation that is a difference between a voltage drop amount that is a difference in voltage after self-discharge and a median value of the voltage drop amount of each battery. Ah Or it is intended to determine how.

請求項２においては、電池が短絡している不良品であるかどうかを判定する電池の検査方法であって、前記電池を充電し、前記電池の電圧を自己放電前電圧として測定し、前記電池を自己放電させ、前記電池の自己放電から任意時間経過後の電圧を自己放電後電圧として測定し、基準時間における、一の電池の前記自己放電前電圧から前記自己放電後電圧の差である電圧降下量と、各電池の前記電圧降下量の中央値との差である電圧降下量偏差に基づいて、前記一の電池が短絡している不良品であるかどうかを判定するものである。   In Claim 2, It is the inspection method of the battery which determines whether it is a defective article with which the battery is short-circuited, Comprising: The said battery is charged, The voltage of the said battery is measured as a voltage before self-discharge, The said battery The voltage after the self-discharge of the battery is measured as a voltage after self-discharge, and the voltage is the difference between the voltage before self-discharge and the voltage after self-discharge of one battery at a reference time. Based on a voltage drop amount deviation which is a difference between a drop amount and a median value of the voltage drop amount of each battery, it is determined whether or not the one battery is a defective product short-circuited.

本発明の電池の検査装置及び電池の検査方法によれば、短絡している不良品の判定精度を向上できる。   According to the battery inspection apparatus and the battery inspection method of the present invention, it is possible to improve the determination accuracy of a short-circuited defective product.

本発明の実施形態に係る検査装置の構成を示す構成図。The block diagram which shows the structure of the test | inspection apparatus which concerns on embodiment of this invention. 本発明の実施形態に係る検査工程の流れを示すフロー図。The flowchart which shows the flow of the test process which concerns on embodiment of this invention. 電圧降下量偏差の時系列を示すグラフ図。The graph which shows the time series of voltage drop amount deviation. 従来技術である電圧降下量の時系列を示すグラフ図。The graph which shows the time series of the voltage drop amount which is a prior art.

図１を用いて、検査装置１００の構成について説明する。
なお、図１の破線は電気信号線を表している。 The configuration of the inspection apparatus 100 will be described with reference to FIG.
In addition, the broken line of FIG. 1 represents the electric signal line.

検査装置１００は、本発明の電池の検査装置の実施形態である。検査装置１００は、リチウムイオン二次電池１０・１０・・・が短絡している不良品であるかどうかの検査を行う装置である。検査装置１００は、リチウムイオン二次電池１０・１０・・・に接続されている。検査装置１００は、電圧測定装置２０と、充電装置３０と、制御装置としてのコントローラ５０と、を具備している。   The inspection apparatus 100 is an embodiment of a battery inspection apparatus of the present invention. The inspection apparatus 100 is an apparatus that inspects whether or not the lithium ion secondary batteries 10,... Are short-circuited defective products. The inspection device 100 is connected to the lithium ion secondary batteries 10. The inspection device 100 includes a voltage measuring device 20, a charging device 30, and a controller 50 as a control device.

電圧測定装置２０は、リチウムイオン二次電池１０・１０・・・のそれぞれの電圧を測定するものである。電圧測定装置２０は、リチウムイオン二次電池１０・１０・・・の正極端子１１・１１・・・と負極端子１２・１２・・・とにそれぞれ接続されている。また、電圧測定装置２０は、コントローラ５０に接続されている。   The voltage measuring device 20 measures each voltage of the lithium ion secondary batteries 10, 10... The voltage measurement device 20 is connected to the positive terminals 11, 11,... And the negative terminals 12, 12,. In addition, the voltage measuring device 20 is connected to the controller 50.

充電装置３０は、リチウムイオン二次電池１０・１０・・・のそれぞれを充電するものである。充電装置３０は、リチウムイオン二次電池１０・１０・・・の正極端子１１・１１・・・と負極端子１２・１２・・・とにそれぞれ接続されている。また、充電装置３０は、コントローラ５０に接続されている。   The charging device 30 charges each of the lithium ion secondary batteries 10. The charging device 30 is connected to the positive terminals 11, 11, ... and the negative terminals 12, 12, ... of the lithium ion secondary batteries 10, 10, ..., respectively. The charging device 30 is connected to the controller 50.

コントローラ５０は、リチウムイオン二次電池１０を自己放電させたとき、自己放電前後の電圧降下量ΔＥに基づいて、リチウムイオン二次電池１０の短絡の有無を検知して、リチウムイオン二次電池１０が不良品であるかどうかの判定を行うものである。コントローラ５０は、電圧測定装置２０と、充電装置３０と、に接続されている。   When the controller 50 self-discharges the lithium ion secondary battery 10, the controller 50 detects whether or not the lithium ion secondary battery 10 is short-circuited based on the voltage drop ΔE before and after the self-discharge. It is determined whether or not is a defective product. The controller 50 is connected to the voltage measuring device 20 and the charging device 30.

図２を用いて、検査工程Ｓ１００について説明する。
なお、図２では、検査工程Ｓ１００の流れをフローチャートにて表している。 The inspection process S100 will be described with reference to FIG.
In addition, in FIG. 2, the flow of inspection process S100 is represented with the flowchart.

検査工程Ｓ１００は、本発明の電池の検査装置及び電池の検査方法の実施形態である。検査工程Ｓ１００は、リチウムイオン二次電池１０・１０・・・を自己放電させたとき、自己放電前後の電圧降下量ΔＥに基づいて、リチウムイオン二次電池１０・１０・・・短絡の有無を検知して、リチウムイオン二次電池１０・１０・・・が不良品であるかどうかの判定を行う工程である。   The inspection step S100 is an embodiment of the battery inspection device and the battery inspection method of the present invention. In the inspection step S100, when the lithium ion secondary batteries 10, 10... Are self-discharged, based on the voltage drop amount ΔE before and after the self-discharge, the presence or absence of the lithium ion secondary batteries 10.10. This is a step of detecting and determining whether or not the lithium ion secondary batteries 10, 10... Are defective.

ステップＳ１１０において、充電装置３０（図１参照）によってリチウムイオン二次電池１０・１０・・・を充電する。このとき、充電装置３０によって検査ロットの全てのリチウムイオン二次電池１０・１０・・・が同時に充電されるものとする。   In step S110, the lithium ion secondary batteries 10, 10... Are charged by the charging device 30 (see FIG. 1). At this time, it is assumed that all the lithium ion secondary batteries 10, 10... In the inspection lot are charged simultaneously by the charging device 30.

なお、検査ロットとは、同一の正極用電極シートから切り出した正極部材と、同一の負極用電極シートから切り出した負極部材と、を組み合わせて生成された捲回体を備えるリチウムイオン二次電池１０・１０・・・としている。   The inspection lot is a lithium ion secondary battery 10 including a wound body produced by combining a positive electrode member cut out from the same positive electrode sheet and a negative electrode member cut out from the same negative electrode sheet.・ 10 ...

ステップＳ１２０において、コントローラ５０は、電圧測定装置２０によって、充電が完了したリチウムイオン二次電池１０・１０・・・の自己放電前における自己放電前電圧Ｅ０をそれぞれ測定する。このとき、電圧測定装置２０によって検査ロットの全てのリチウムイオン二次電池１０・１０・・・の自己放電前電圧Ｅ０が同時に測定されるものとする。   In step S120, the controller 50 measures the pre-self-discharge voltage E0 before the self-discharge of the lithium ion secondary batteries 10, 10,... At this time, it is assumed that the voltage measuring device 20 simultaneously measures the pre-self-discharge voltage E0 of all the lithium ion secondary batteries 10, 10.

ステップＳ１３０において、コントローラ５０は、リチウムイオン二次電池１０・１０・・・を自己放電させる。このとき、検査ロットの全てのリチウムイオン二次電池１０・１０・・・が同時に自己放電されるものとする。   In step S130, the controller 50 self-discharges the lithium ion secondary batteries 10, 10. At this time, all the lithium ion secondary batteries 10, 10... In the inspection lot are simultaneously self-discharged.

ステップＳ１４０において、コントローラ５０は、電圧測定装置２０によって、自己放電開始から放電時間Ｔｒ経過後のリチウムイオン二次電池１０・１０・・・の自己放電後電圧Ｅ１を測定する。このとき、電圧測定装置２０によって検査ロットの全てのリチウムイオン二次電池１０・１０・・・の自己放電後電圧Ｅ１が同時に測定されるものとする。   In step S140, the controller 50 uses the voltage measuring device 20 to measure the self-discharge voltage E1 of the lithium ion secondary batteries 10, 10... After the discharge time Tr has elapsed from the start of self-discharge. At this time, it is assumed that the self-discharge voltage E1 of all the lithium ion secondary batteries 10, 10.

なお、電圧測定装置２０によってリチウムイオン二次電池１０・１０・・・の自己放電後における自己放電後電圧Ｅ１を測定するタイミングについては特に限定しない。言い換えれば、後述する基準電圧降下量偏差ΔＥｓの基準時間Ｔｓと、実測の放電時間Ｔｒとは異なっていても良い。   In addition, the timing which measures the voltage E1 after the self-discharge after the self-discharge of the lithium ion secondary batteries 10, 10. In other words, a reference time Ts of a reference voltage drop amount deviation ΔEs described later may be different from an actually measured discharge time Tr.

ステップＳ１５０において、コントローラ５０は、検査ロットの全てのリチウムイオン二次電池１０・１０・・・について、自己放電前電圧Ｅ０から自己放電後電圧Ｅ１を差し引いた電圧降下量ΔＥを算出する。このとき、コントローラ５０によって検査ロットの全てのリチウムイオン二次電池１０・１０・・・の電圧降下量ΔＥが同時に算出されるものとする。   In step S150, the controller 50 calculates the voltage drop amount ΔE obtained by subtracting the post-self-discharge voltage E1 from the pre-self-discharge voltage E0 for all the lithium ion secondary batteries 10, 10. At this time, it is assumed that the voltage drop amount ΔE of all the lithium ion secondary batteries 10.

ステップＳ１６０において、コントローラ５０は、検査ロットの全てのリチウムイオン二次電池１０・１０・・・の電圧降下量ΔＥのうちから、中央値（メジアン）ΔＥｍを算出する。なお、中央値ΔＥｍは、検査工程Ｓ１００において、良品であるリチウムイオン二次電池の電圧降下量の位置づけとなる。   In step S160, the controller 50 calculates a median (median) ΔEm from among the voltage drop amounts ΔE of all the lithium ion secondary batteries 10, 10... In the inspection lot. The median value ΔEm is the position of the voltage drop amount of a non-defective lithium ion secondary battery in the inspection step S100.

ステップＳ１７０において、コントローラ５０は、検査ロットの全てのリチウムイオン二次電池１０・１０・・・について、それぞれの電圧降下量ΔＥと中央値ΔＥｍとの差である電圧降下量偏差ΔＥ―ΔＥｍを算出する。   In step S170, the controller 50 calculates a voltage drop deviation ΔE−ΔEm that is the difference between the voltage drop ΔE and the median value ΔEm for all of the lithium ion secondary batteries 10, 10... In the inspection lot. To do.

ステップＳ１８０において、コントローラ５０は、検査ロットの全てのリチウムイオン二次電池１０・１０・・・について、それぞれの電圧降下量偏差ΔＥ―ΔＥｍに放電時間Ｔｒに対する基準時間Ｔｓの割合（Ｔｓ／Ｔｒ）を乗じて、基準時間Ｔｓにおける電圧降下量偏差（基準時間）（ΔＥ―ΔＥｍ）ｓを算出する。   In step S180, the controller 50 determines the ratio of the reference time Ts to the discharge time Tr (Ts / Tr) to the voltage drop amount deviation ΔE−ΔEm for all the lithium ion secondary batteries 10. To calculate a voltage drop amount deviation (reference time) (ΔE−ΔEm) s at the reference time Ts.

ステップＳ１９０において、コントローラ５０は、検査ロットの全てのリチウムイオン二次電池１０・１０・・・について、それぞれの電圧降下量偏差（基準時間）（ΔＥ―ΔＥｍ）ｓが基準電圧降下量偏差ΔＥｓより小さいかどうかを確認する。なお、基準電圧降下量偏差ΔＥｓとは、基準時間Ｔｓにおける良品として許容される電圧降下量偏差ΔＥ―ΔＥｍであって、予めコントローラ５０に設定されている値である。   In step S190, the controller 50 determines that each voltage drop amount deviation (reference time) (ΔE−ΔEm) s is greater than the reference voltage drop amount deviation ΔEs for all the lithium ion secondary batteries 10. Check if it is small. The reference voltage drop amount deviation ΔEs is a voltage drop amount deviation ΔE−ΔEm allowed as a non-defective product at the reference time Ts, and is a value set in the controller 50 in advance.

電圧降下量偏差（基準時間）（ΔＥ―ΔＥｍ）ｓが基準電圧降下量偏差ΔＥｓより小さい場合には、ステップＳ２１０に移行する。電圧降下量偏差（基準時間）（ΔＥ―ΔＥｍ）ｓが基準電圧降下量偏差ΔＥｓ以上の場合には、ステップＳ２２０に移行する。   When the voltage drop amount deviation (reference time) (ΔE−ΔEm) s is smaller than the reference voltage drop amount deviation ΔEs, the process proceeds to step S210. When the voltage drop amount deviation (reference time) (ΔE−ΔEm) s is equal to or larger than the reference voltage drop amount deviation ΔEs, the process proceeds to step S220.

ステップＳ２１０において、コントローラ５０は、判定対象のリチウムイオン二次電池１０について、短絡していない良品であると判定する。   In step S210, the controller 50 determines that the lithium ion secondary battery 10 to be determined is a non-defective product that is not short-circuited.

ステップＳ２２０において、コントローラ５０は、判定対象のリチウムイオン二次電池１０について、短絡している不良品であると判定する。   In step S220, the controller 50 determines that the lithium ion secondary battery 10 to be determined is a defective product that is short-circuited.

図３を用いて、電圧降下量偏差ΔＥ―ΔＥｍについて説明する。
なお、図３では、電圧降下量偏差ΔＥ―ΔＥｍをグラフ図（横軸は時系列Ｔであって右側に向かうに従って時間が経過し、縦軸は電圧降下量偏差ΔＥ―ΔＥｍであって下側に向かうに従って電圧降下量偏差ΔＥ―ΔＥｍが大きくなる）によって表している。 The voltage drop amount deviation ΔE−ΔEm will be described with reference to FIG.
In FIG. 3, the voltage drop deviation ΔE−ΔEm is a graph (the horizontal axis is time series T and time elapses toward the right side, and the vertical axis is the voltage drop deviation ΔE−ΔEm. The voltage drop amount deviation ΔE−ΔEm increases as it goes to ().

検査工程Ｓ１００では、電圧降下量ΔＥと中央値ΔＥｍとの差である電圧降下量偏差ΔＥ―ΔＥｍによって近似線（図３における実線）を作成し、作成した近似線によって基準時間Ｔｓにおける電圧降下量偏差（基準時間）（ΔＥ―ΔＥｍ）ｓを算出し、算出した電圧降下量偏差（基準時間）（ΔＥ―ΔＥｍ）ｓに基づいて電池が良品であるかどうかを判定している。   In the inspection step S100, an approximate line (solid line in FIG. 3) is created by the voltage drop amount deviation ΔE−ΔEm which is the difference between the voltage drop amount ΔE and the median value ΔEm, and the voltage drop amount at the reference time Ts is created by the created approximate line. Deviation (reference time) (ΔE−ΔEm) s is calculated, and whether or not the battery is a good product is determined based on the calculated voltage drop amount deviation (reference time) (ΔE−ΔEm) s.

ここで、電圧降下量偏差ΔＥ―ΔＥｍによる近似線は直線性が高く、実際の電圧挙動（図３における破線）との乖離がほとんどない。この理由としては、電圧降下量偏差ΔＥ―ΔＥｍは、不良品のリチウムイオン２次電池１０の自己放電量である電圧降下量ΔＥと、良品のリチウムイオン２次電池１０の自己放電量である中央値ΔＥｍとの差であり、言い換えれば、金属の短絡による電圧降下量である。つまり、金属の短絡による電圧降下量は、オームの法則に従って、時系列に対して直線的に電圧が低下するからである。   Here, the approximate line based on the voltage drop amount deviation ΔE−ΔEm has high linearity, and there is almost no deviation from the actual voltage behavior (broken line in FIG. 3). This is because the voltage drop amount deviation ΔE−ΔEm is a voltage drop amount ΔE that is a self-discharge amount of a defective lithium ion secondary battery 10 and a center that is a self-discharge amount of a non-defective lithium ion secondary battery 10. This is the difference from the value ΔEm, in other words, the amount of voltage drop due to a short circuit of the metal. That is, the voltage drop due to the short circuit of the metal is linearly reduced with respect to time series according to Ohm's law.

検査装置１００及び検査工程Ｓ１００の効果について説明する。
従来、リチウムイオン二次電池１０・１０・・・が短絡している不良品であるかどうかの判定では、電圧降下量ΔＥによって近似線を作成し、作成した近似線によって基準時間Ｔｓにおける電圧降下量ΔＥを算出し、算出した電圧降下量ΔＥに基づいて電池が短絡している不良品であるかどうかを判定していた。しかし、実際の電圧挙動（図４における破線）と近似線とには乖離があるため、放電時間Ｔｒと基準時間Ｔｓとが異なる場合には、正確な良否判定ができなかった。 The effects of the inspection apparatus 100 and the inspection process S100 will be described.
Conventionally, in determining whether or not the lithium ion secondary batteries 10, 10... Are defective short-circuited, an approximate line is created based on the voltage drop amount ΔE, and the voltage drop at the reference time Ts is created using the created approximate line. The amount ΔE is calculated, and whether or not the battery is a defective product is determined based on the calculated voltage drop amount ΔE. However, since there is a difference between the actual voltage behavior (broken line in FIG. 4) and the approximate line, when the discharge time Tr and the reference time Ts are different, an accurate pass / fail judgment cannot be made.

検査装置１００及び検査工程Ｓ１００によれば、短絡している不良品の判定精度を向上できる。すなわち、電圧降下量偏差ΔＥ―ΔＥｍによる近似線は直線性が高く、実際の電圧挙動と乖離がほとんどないため、放電時間Ｔｒと基準時間Ｔｓとが異なる場合であっても、正確な良否判定ができる。   According to the inspection apparatus 100 and the inspection step S100, it is possible to improve the determination accuracy of a defective product that is short-circuited. That is, the approximate line based on the voltage drop amount deviation ΔE−ΔEm has high linearity, and there is almost no deviation from the actual voltage behavior. Therefore, even when the discharge time Tr and the reference time Ts are different, accurate pass / fail judgment is possible. it can.

また、電圧降下量偏差ΔＥ―ΔＥｍによる近似線は直線性が高く、実際の電圧挙動と乖離がほとんどないため、基準電圧降下量偏差ΔＥｓの基準時間Ｔｓと実測の放電時間Ｔｒとが異なっていても短絡している不良品の判定精度を向上できる。すなわち、工場の休業時間（土日祝）に電圧測定装置２０を作動できない場合、或いは、電圧測定装置２０のサイクルタイムによって基準時間Ｔｓ経過後に電圧測定できない場合であっても短絡している不良品の判定がきる。   In addition, the approximate line based on the voltage drop deviation ΔE−ΔEm has high linearity and almost no deviation from the actual voltage behavior. Therefore, the reference time Ts of the reference voltage drop deviation ΔEs is different from the actually measured discharge time Tr. In addition, it is possible to improve the determination accuracy of defective products that are short-circuited. That is, even if the voltage measuring device 20 cannot be operated during the factory closed time (Saturdays, Sundays, and holidays) or even if the voltage cannot be measured after the lapse of the reference time Ts due to the cycle time of the voltage measuring device 20, Judgment is complete.

１０ リチウムイオン二次電池
２０ 電圧測定装置
３０ 充電装置
１００ 検査装置
Ｓ１００ 検査工程
ΔＥ 電圧降下量
ΔＥ―ΔＥｍ 電圧降下量偏差
（ΔＥ―ΔＥｍ）ｓ 電圧降下量偏差（基準時間） DESCRIPTION OF SYMBOLS 10 Lithium ion secondary battery 20 Voltage measuring apparatus 30 Charging apparatus 100 Inspection apparatus S100 Inspection process ΔE Voltage drop amount ΔE-ΔEm Voltage drop amount deviation (ΔE-ΔEm) s Voltage drop amount deviation (reference time)

Claims (2)

電池が短絡している不良品であるかどうかを判定する電池の検査装置であって、
前記電池を充電する充電装置と、
前記電池の電圧を測定する電圧測定装置と、
前記電池が良品であるかどうかを判定する制御装置と、
を具備し、
前記制御装置は、
前記充電装置によって前記電池を充電し、
前記電圧測定装置によって前記電池の電圧を自己放電前電圧として測定し、
前記電池を自己放電させ、
前記電圧測定装置によって前記電池の自己放電から任意時間経過後の電圧を自己放電後電圧として測定し、
基準時間における、一の電池の前記自己放電前電圧から前記自己放電後電圧の差である電圧降下量と、各電池の前記電圧降下量の中央値との差である電圧降下量偏差に基づいて、前記一の電池が短絡している不良品であるかどうかを判定する、
電池の検査装置。 A battery inspection device for determining whether a battery is a defective product that is short-circuited,
A charging device for charging the battery;
A voltage measuring device for measuring the voltage of the battery;
A control device for determining whether or not the battery is a good product;
Comprising
The controller is
Charging the battery with the charging device;
Measure the voltage of the battery as a voltage before self-discharge by the voltage measuring device,
Let the battery self-discharge,
By measuring the voltage after the elapse of an arbitrary time from the self-discharge of the battery by the voltage measuring device as a voltage after self-discharge,
Based on a voltage drop amount deviation that is a difference between a voltage drop amount that is a difference between the pre-self-discharge voltage of one battery and a voltage after the self-discharge and a median value of the voltage drop amount of each battery at a reference time. , Determine whether the one battery is a short-circuited defective product,
Battery inspection device. 電池が短絡している不良品であるかどうかを判定する電池の検査方法であって、
前記電池を充電し、
前記電池の電圧を自己放電前電圧として測定し、
前記電池を自己放電させ、
前記電池の自己放電から任意時間経過後の電圧を自己放電後電圧として測定し、
基準時間における、一の電池の前記自己放電前電圧から前記自己放電後電圧の差である電圧降下量と、各電池の前記電圧降下量の中央値との差である電圧降下量偏差に基づいて、前記一の電池が短絡している不良品であるかどうかを判定する、
電池の検査方法。 A method for inspecting a battery to determine whether or not the battery is a short-circuited defective product,
Charging the battery,
Measure the voltage of the battery as the voltage before self-discharge,
Let the battery self-discharge,
Measure the voltage after elapse of an arbitrary time from the self-discharge of the battery as the voltage after self-discharge,
Based on a voltage drop amount deviation that is a difference between a voltage drop amount that is a difference between the pre-self-discharge voltage of one battery and a voltage after the self-discharge and a median value of the voltage drop amount of each battery at a reference time , Determine whether the one battery is a short-circuited defective product,
Battery inspection method.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106918785A (en) * 2015-12-27 2017-07-04 深圳市沃特玛电池有限公司 One kind detection self discharge of lithium iron phosphate battery method
CN108663627A (en) * 2018-03-28 2018-10-16 维沃移动通信有限公司 A kind of self-discharge of battery detection method and self-discharge of battery detection device
KR20190071342A (en) * 2017-12-14 2019-06-24 주식회사 엘지화학 Apparatus and method for diagnosings battery cell
CN111413629A (en) * 2020-02-24 2020-07-14 上海蔚来汽车有限公司 Short circuit monitoring method, system and device for single batteries in power battery
WO2024101908A1 (en) * 2022-11-11 2024-05-16 주식회사 엘지에너지솔루션 Battery pack management device and operation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001332310A (en) * 2000-05-22 2001-11-30 Nippon Telegr & Teleph Corp <Ntt> Capacity estimating method and deterioration judging apparatus for lithium ion cell and lithium ion cell pack
JP2004132776A (en) * 2002-10-09 2004-04-30 Matsushita Electric Ind Co Ltd Inspection method of battery
JP2004288515A (en) * 2003-03-24 2004-10-14 Matsushita Electric Ind Co Ltd Inspection method of cylinder-shaped battery
JP2004288588A (en) * 2003-03-25 2004-10-14 Matsushita Electric Ind Co Ltd State judging device of lead-acid storage battery, and lead-acid storage battery
JP2011018482A (en) * 2009-07-07 2011-01-27 Toyota Motor Corp Inspection method of battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001332310A (en) * 2000-05-22 2001-11-30 Nippon Telegr & Teleph Corp <Ntt> Capacity estimating method and deterioration judging apparatus for lithium ion cell and lithium ion cell pack
JP2004132776A (en) * 2002-10-09 2004-04-30 Matsushita Electric Ind Co Ltd Inspection method of battery
JP2004288515A (en) * 2003-03-24 2004-10-14 Matsushita Electric Ind Co Ltd Inspection method of cylinder-shaped battery
JP2004288588A (en) * 2003-03-25 2004-10-14 Matsushita Electric Ind Co Ltd State judging device of lead-acid storage battery, and lead-acid storage battery
JP2011018482A (en) * 2009-07-07 2011-01-27 Toyota Motor Corp Inspection method of battery

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106918785A (en) * 2015-12-27 2017-07-04 深圳市沃特玛电池有限公司 One kind detection self discharge of lithium iron phosphate battery method
KR20190071342A (en) * 2017-12-14 2019-06-24 주식회사 엘지화학 Apparatus and method for diagnosings battery cell
KR102368711B1 (en) 2017-12-14 2022-02-25 주식회사 엘지에너지솔루션 Apparatus for diagnosings battery cell
CN108663627A (en) * 2018-03-28 2018-10-16 维沃移动通信有限公司 A kind of self-discharge of battery detection method and self-discharge of battery detection device
CN108663627B (en) * 2018-03-28 2020-03-24 维沃移动通信有限公司 Battery self-discharge detection method and battery self-discharge detection device
CN111413629A (en) * 2020-02-24 2020-07-14 上海蔚来汽车有限公司 Short circuit monitoring method, system and device for single batteries in power battery
WO2021169487A1 (en) * 2020-02-24 2021-09-02 上海蔚来汽车有限公司 Short-circuit monitoring method, system and device for cells in power battery
CN111413629B (en) * 2020-02-24 2024-02-02 上海蔚来汽车有限公司 Short circuit monitoring method, system and device for single battery in power battery
WO2024101908A1 (en) * 2022-11-11 2024-05-16 주식회사 엘지에너지솔루션 Battery pack management device and operation method thereof

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