JP2012033344A - Processing method of battery pack - Google Patents

Processing method of battery pack Download PDF

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JP2012033344A
JP2012033344A JP2010170795A JP2010170795A JP2012033344A JP 2012033344 A JP2012033344 A JP 2012033344A JP 2010170795 A JP2010170795 A JP 2010170795A JP 2010170795 A JP2010170795 A JP 2010170795A JP 2012033344 A JP2012033344 A JP 2012033344A
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case
battery pack
hole
battery
liquid
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Ryozo Ushio
亮三 牛尾
Kazuya Maeba
和也 前場
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Sumitomo Metal Mining Co Ltd
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Sumitomo Metal Mining Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/84Recycling of batteries or fuel cells

Abstract

PROBLEM TO BE SOLVED: To provide a discharging method of a battery pack by which a battery pack incorporating a protective circuit can be discharged simply and safely.SOLUTION: In the method of processing a battery pack PB having a protective circuit PS and containing a plurality of battery cells C in a case K, a through hole h communicating between the inside and outside of the case K is formed in the case K, and the battery pack PB in which the through hole h is formed is immersed in liquid having electric conductivity. When the battery pack PB is immersed in liquid having electric conductivity after the through hole h is formed in the case K, the liquid can be introduced into the case K through the through hole h. Since the liquid directly touches the electrode of the battery cell C in the case K and a current flows between the electrodes without passing through the protective circuit PS, even the battery pack PB provided with the protective circuit PS can be discharged efficiently. Since the through hole h is simply formed in the case K, preprocessing for discharge processing can be performed simply and easily.

Description

本発明は、電池パックの処理方法に関する。さらに詳しくは、複数の電池セルがケース内に封入されて形成された電池パックにおいて、封入されている電池セルに残留している電気を除去する作業に採用することができる電池パックの処理方法に関する。   The present invention relates to a battery pack processing method. More specifically, the present invention relates to a battery pack processing method that can be employed in an operation for removing electricity remaining in a sealed battery cell in a battery pack formed by sealing a plurality of battery cells in a case. .

使用済みの電池(以下、廃電池という)には、多数の有価金属(ニッケル、コバルト、マンガン、銅、リチウム等)が使用されているため、廃電池を解体して有価金属を回収するリサイクル処理が行われる。
かかる廃電池には、機器を駆動する電力はなくても、ある程度の電力が残留している可能性がある。このため、リサイクル処理における電池の解体中に電池の正極と負極とがショートした状態になると、電池内で大電流が流れ発熱して発火したり、炭酸エチレン、炭酸プロピレン、炭酸ジメチル、炭酸ジエチル、炭酸メチルエチル等の電解液が突沸したりするなどのトラブルを生じる危険性がある。
Many used valuable metals (nickel, cobalt, manganese, copper, lithium, etc.) are used in used batteries (hereinafter referred to as waste batteries), so the recycling process involves dismantling the used batteries and collecting valuable metals. Is done.
Even if there is no power for driving the device, there is a possibility that a certain amount of power remains in the waste battery. For this reason, when the positive electrode and negative electrode of the battery are short-circuited during disassembly of the battery in the recycling process, a large current flows in the battery to generate heat and ignite, or ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, There is a risk of causing troubles such as bumping of electrolyte such as methyl ethyl carbonate.

そこで、上記のごとき問題が生じることを防ぐために、廃電池を解体する前に残留している電力を放電等させて、残留電力を減少させることが行われている。そして、かかる処理を行う場合、廃電池を個別に放電等させて残留している電力を減少させることは手間がかかりすぎて実用的ではないので、従来、水等の伝導物質の溶液中に廃電池を投入し、伝導物質を介して電極間を短絡させ放電する方法などが提案されている。   Therefore, in order to prevent the above problems from occurring, the remaining power is reduced by discharging the remaining power before disassembling the waste battery. When such treatment is performed, it is not practical to reduce the remaining electric power by discharging the waste battery individually. A method has been proposed in which a battery is inserted and the electrodes are short-circuited via a conductive material to discharge.

しかるに、複数の電池セルがパッケージとして封入されているパック形態の電池(以下、単に電池パックという)では、過電流を防止する保護回路が付いたものが多くなっている。かかる保護回路を有する電池パックでは、電池パックをそのまま伝導物質の溶液中に浸漬させて外部端子間を短絡させても放電が効率的に進まない。なぜなら、外部端子間に大電流が流れると、保護回路が電流を制御することがあるからである。
また、電流制御機能を持たない種類の保護回路を持つ電池パックであったとしても、保護回路が外部との電気的接続を行うために電池パックの外面に設けられている外部端子は、その金属露出部の表面積が安全上小さくなっている。すると、外部端子の導通面積が小さくなっていることによって、電池パック内部の複数の電池セル全てを対象とした十分な放電電流が得にくく、放電に時間がかかってしまう。
However, many pack-type batteries (hereinafter simply referred to as battery packs) in which a plurality of battery cells are enclosed as a package are provided with a protection circuit for preventing overcurrent. In a battery pack having such a protection circuit, even if the battery pack is immersed in a conductive material solution as it is and the external terminals are short-circuited, the discharge does not proceed efficiently. This is because the protection circuit may control the current when a large current flows between the external terminals.
Even if the battery pack has a type of protection circuit that does not have a current control function, the external terminal provided on the outer surface of the battery pack for the electrical connection of the protection circuit to the outside is The surface area of the exposed part is small for safety. Then, since the conduction area of the external terminal is reduced, it is difficult to obtain a sufficient discharge current for all the plurality of battery cells inside the battery pack, and it takes time to discharge.

このため、保護回路を有する電池パックでは、電池パックを液体窒素等で冷却して内部にある引火性の有機溶媒を凍らせて安定化させ、パッケージのみをロールクラッシャー等により開砕し、パッケージ内部から電池セルを取り出して、取り出された電池セルを処理したり(特許文献1、2)、パッケージを一つ一つ手作業で分解して開き、電池セルを取り出して取り出された電池セルについて放電処理を行ったり、もしくは、別の処理にて無害化するなどのコストと手間のかかる方法が採用されていた。   For this reason, in a battery pack having a protection circuit, the battery pack is cooled with liquid nitrogen or the like to freeze and stabilize the flammable organic solvent inside, and only the package is crushed by a roll crusher or the like. The battery cell is taken out from the battery, and the taken out battery cell is processed (Patent Documents 1 and 2), or the package is manually disassembled and opened one by one, and the battery cell is taken out and discharged. A costly and laborious method such as processing or detoxifying by another processing has been adopted.

近年使用が増加し、また、廃棄量が増加している電池パックについて、効率よくリサイクル処理する上では、電池パック内の電池セルについて効率よく放電処理を行うことが重要であり、効率よく放電処理を行う方法が求められている。   In order to efficiently recycle battery packs that have been used in recent years and the amount of waste is increasing, it is important to efficiently perform discharge treatment on the battery cells in the battery pack. There is a need for a way to do this.

特許3495707号公報Japanese Patent No. 3495707 特表2004−508694号公報Special Table 2004-508694

本発明は上記事情に鑑み、保護回路を内蔵している電池パックを簡便かつ安全に放電処理することができる電池パックの放電方法を提供することを目的とする。   In view of the circumstances described above, an object of the present invention is to provide a battery pack discharging method capable of easily and safely discharging a battery pack having a built-in protection circuit.

第1発明の電池パックの放電方法は、ケース内に複数の電池セルが収容された、保護回路を有する電池パックを処理する方法であって、前記ケースに、該ケース内部と外部との間を連通する貫通孔を形成し、該貫通孔が形成された電池パックを、電気伝導性を有する液体に浸漬することを特徴とする。
第2発明の電池パックの放電方法は、第1発明において、前記ケース内に、前記電池セルが複数列並んで収容されており、前記ケースにおいて、前記電池セルが並んでいる方向の一端部と他端部に、前記貫通孔を形成することを特徴とする。
A battery pack discharging method according to a first aspect of the present invention is a method of processing a battery pack having a protection circuit in which a plurality of battery cells are housed in a case, and the case is provided between the inside and the outside of the case. The through-hole which connects is formed, The battery pack in which this through-hole was formed is immersed in the liquid which has electrical conductivity, It is characterized by the above-mentioned.
The battery pack discharging method according to a second aspect of the present invention is the battery pack according to the first aspect of the present invention, wherein the battery cells are accommodated in a plurality of rows in the case, and one end of the case in the direction in which the battery cells are aligned in the case; The through hole is formed in the other end.

第1発明によれば、ケースに貫通孔を形成してから電池パックを電気伝導性を有する液体に浸漬すれば、貫通孔を通して液体をケース内に導入することができる。すると、ケース内の電池セルの電極に直接液体が接触し、保護回路を通ることなく、電極間に電流が流れるので、保護回路が設けられている電池パックであっても、効率よく放電処理を行うことができる。しかも、ケースに貫通孔を形成するだけであるから、放電処理のための前処理を簡単かつ容易に行うことができる。
第2発明によれば、一方の端部に設けられた貫通孔から液体を流入させる一方、他方の端部に設けられた貫通孔からケース内部の気体を排出させることができる。しかも、液体や気体を、電池セルの並んでいる方向に沿って流すことができるので、液体をケース内に迅速に充満させることができるし、放電の際に発生する気体の排出処理も迅速に行うことができる。よって、放電処理の時間を短くすることができる。
According to the first invention, if the battery pack is immersed in a liquid having electrical conductivity after the through hole is formed in the case, the liquid can be introduced into the case through the through hole. Then, the liquid directly contacts the electrode of the battery cell in the case, and the current flows between the electrodes without passing through the protection circuit. Therefore, even in the battery pack provided with the protection circuit, the discharge treatment can be performed efficiently. It can be carried out. In addition, since only the through-hole is formed in the case, the pretreatment for the discharge treatment can be performed easily and easily.
According to the second aspect of the invention, the liquid can be allowed to flow from the through hole provided at one end, while the gas inside the case can be discharged from the through hole provided at the other end. In addition, since liquid and gas can flow along the direction in which the battery cells are lined up, the case can be quickly filled with liquid, and the process for discharging the gas generated during discharge can be performed quickly. It can be carried out. Therefore, the discharge process time can be shortened.

本発明の電池パックの放電方法によって電池パックPBを処理する作業を説明した図である。It is the figure explaining the operation | work which processes the battery pack PB by the discharge method of the battery pack of this invention.

つぎに、本発明の実施形態を図面に基づき説明する。
本発明の電池パックの放電方法は、複数の電池セルがケースに収容されてパッケージされた電池パックにおいて、電池パックから有価金属を回収する回収処理を行う前に行う放電処理を行う方法である。
具体的には、ケース内に収容されている複数の電池セルについて、その内部に残存している電力を放電させて、回収処理において電池のショートなどに起因する発熱や、その発熱によって電池内部の活性リチウムや有機物質(炭酸エチレン、炭酸エステル類等)などの物質同士が化学反応をおこし電池内の圧力が一気に上昇してガス噴出・爆発炎上するなどの問題が生じることを防ぐために放電処理を行う方法である。
Next, an embodiment of the present invention will be described with reference to the drawings.
The battery pack discharging method of the present invention is a method of performing a discharging process before a recovery process for recovering valuable metals from a battery pack in a battery pack in which a plurality of battery cells are accommodated in a case and packaged.
Specifically, for a plurality of battery cells housed in the case, the power remaining in the battery cells is discharged, and heat generated due to a battery short-circuit or the like in the recovery process, Discharge treatment is performed to prevent problems such as active lithium and organic substances (ethylene carbonate, carbonate esters, etc.) reacting with each other and causing the pressure inside the battery to rise suddenly, causing gas ejection and explosion flames. How to do it.

(電池パックPBの説明)
まず、本発明の電池パックの放電方法(以下、本発明の方法という)について説明する前に、本発明の方法によって処理される電池パックPBを説明する。
図1において、符号PBは、本発明の方法によって処理される電池パックを示している。この電池パックPBは、例えば、パソコンや電気自動車、電動自転車、電動二輪車、携帯電話、デジタルカメラ、電動工具、家庭用蓄電池等のバッテリとして使用されるものであり、ケースK内に複数の電池セルCが収容されて形成されたものである。
(Description of battery pack PB)
First, before describing the battery pack discharging method of the present invention (hereinafter referred to as the method of the present invention), the battery pack PB processed by the method of the present invention will be described.
In FIG. 1, the code | symbol PB has shown the battery pack processed by the method of this invention. The battery pack PB is used, for example, as a battery for a personal computer, an electric vehicle, an electric bicycle, an electric two-wheeled vehicle, a mobile phone, a digital camera, an electric tool, a household storage battery, and the like. C is formed and accommodated.

電池セルCは、例えば、円筒型(鉄ケース)、角型(鉄ケースもしくはアルミケース)、ラミネート型のリチウムイオン電池やニッケル水素電池などであるが、一般的な電池パックPBに使用されるものであれば、とくに限定されない。   The battery cell C is, for example, a cylindrical type (iron case), a square type (iron case or aluminum case), a laminate type lithium ion battery, a nickel metal hydride battery, etc., but used for a general battery pack PB. If it is, it will not be specifically limited.

ケースKは、通常、プラスチックなどの素材を成形して形成された中空な箱形の部材であり、その内部の中空な空間に電池セルCを複数収容できるように構成されている。
例えば、ケースKは、複数の電池セル列が形成され、かつ、各電池セル列は電池セル列の軸方向(図1(A)のa方向)と各電池セルCの軸方向とがほぼ同軸となるように、電池セルCを収容できるような形状に形成されている(図1(A)参照)。
The case K is usually a hollow box-shaped member formed by molding a material such as plastic, and is configured so that a plurality of battery cells C can be accommodated in a hollow space inside the case K.
For example, in the case K, a plurality of battery cell rows are formed, and in each battery cell row, the axial direction of the battery cell row (direction a in FIG. 1A) and the axial direction of each battery cell C are substantially coaxial. In such a manner, the battery cell C can be accommodated (see FIG. 1A).

また、ケースKには、外部と電池セルCとを電気的に接続する外部電極が設けられており、この外部電極と電池セルCとを電気的に接続する電気経路に、保護回路PSが設けられている。この保護回路PSは、外部電極から外部に供給される電流が所定の量以上とならないように制御する機能を有するもの、つまり、過大な電流が流れないように電流量を制御する機能を有するものである。   Further, the case K is provided with an external electrode for electrically connecting the outside and the battery cell C, and a protection circuit PS is provided in an electrical path for electrically connecting the external electrode and the battery cell C. It has been. This protection circuit PS has a function of controlling the current supplied from the external electrode to the outside so as not to exceed a predetermined amount, that is, a function of controlling the amount of current so that an excessive current does not flow. It is.

(電池パックPBの放電方法)
つぎに、本発明の方法について説明する。
まず、使用済みの電池パックPBに対して、そのケースKにその内部と外部との間を連通する貫通孔hを形成する(図1(B)、孔形成工程S1)。
このとき、貫通孔hを、ケースKにおいて、電池セル列の一端部と他端部にそれぞれ形成する。例えば、図1(B)であれば、ケースKにおいて、電池セル列の一端が位置する側方端面に貫通孔Lhが形成されており、かつ、電池セル列の一端が位置する上面に貫通孔Uhが形成されている。
(Method of discharging battery pack PB)
Next, the method of the present invention will be described.
First, a through-hole h that communicates between the inside and the outside is formed in the case K of the used battery pack PB (FIG. 1 (B), hole forming step S1).
At this time, the through holes h are formed in the case K at one end and the other end of the battery cell row, respectively. For example, in FIG. 1B, in the case K, a through hole Lh is formed on the side end surface where one end of the battery cell row is located, and the through hole is formed on the upper surface where one end of the battery cell row is located. Uh is formed.

ケースKに貫通孔hが形成されれば、その電池パックPBを、電気伝導性を有する液体、例えば、塩化ナトリウム溶液などの放電液ALに電池パックPBを浸漬する(図1(C)、浸漬工程S1)。すると、貫通孔hを通して放電液ALがケースK内に流入し、放電液ALによってケースK内が満たされる。   If the through-hole h is formed in the case K, the battery pack PB is immersed in a liquid having electrical conductivity, for example, a discharge liquid AL such as a sodium chloride solution (FIG. 1C, immersion). Step S1). Then, the discharge liquid AL flows into the case K through the through hole h, and the case K is filled with the discharge liquid AL.

例えば、図1(C)に示すように、ケースKに貫通孔Lhと貫通孔Uhとが形成されている場合には、貫通孔Lhが形成されている面が下方に、貫通孔Uhが形成されている面が上方に位置するように浸漬させる。すると、貫通孔UhからケースK内部の気体を排出させながら、貫通孔LhからケースK内部に放電液ALを流入させることができるので、迅速にケースK内を放電液ALで満たすことができる。
なお、貫通孔Lhが形成されている面が上方に、貫通孔Uhが形成されている面が下方に位置するように浸漬させてもよいのは、いうまでもない。
For example, as shown in FIG. 1C, when the through hole Lh and the through hole Uh are formed in the case K, the surface on which the through hole Lh is formed is formed downward and the through hole Uh is formed. The surface is immersed so that the surface is positioned upward. Then, the discharge liquid AL can be caused to flow into the case K from the through hole Lh while discharging the gas inside the case K from the through hole Uh, so that the case K can be quickly filled with the discharge liquid AL.
Needless to say, the surface may be dipped so that the surface on which the through hole Lh is formed is located on the upper side and the surface on which the through hole Uh is formed on the lower side.

貫通孔hを通して放電液ALがケースK内に流入することによって、電池セルCの両極端子に放電液ALが接触するようになる。すると、放電液ALを介して、電池セルCの両極端子間が直接導通される。つまり、放電液ALによって、保護回路PSをバイパスして電池セルCの両極端子が導通されるから、電池セルCからは保護回路PSによって制限されることなく電流が放電される。
また、外部端子と電液ALとの接触面積に比べて、各電池セルCの両極端子と放電液ALとの接触面積はその合計面積が大きいため、比較的大きな放電電流を得やすい。
よって、電池セルCから短時間で大量の放電を生じさせることが可能となるので、電池パックPBの放電処理、言い換えれば、複数の電池セルCの放電処理を効率よく短時間で実施することができる。
As the discharge liquid AL flows into the case K through the through-hole h, the discharge liquid AL comes into contact with the bipolar terminals of the battery cell C. As a result, the electrode terminals of the battery cell C are directly connected via the discharge liquid AL. In other words, the discharge liquid AL bypasses the protection circuit PS and the bipolar terminals of the battery cell C are conducted, so that current is discharged from the battery cell C without being restricted by the protection circuit PS.
In addition, since the total area of the contact area between the electrode terminals of each battery cell C and the discharge liquid AL is larger than the contact area between the external terminal and the liquid electrolyte AL, it is easy to obtain a relatively large discharge current.
Therefore, since a large amount of discharge can be generated from the battery cell C in a short time, the discharge process of the battery pack PB, in other words, the discharge process of the plurality of battery cells C can be efficiently performed in a short time. it can.

そして、上記のごとき放電処理を行った電池パックPBについて、破砕・浸出処理などの回収処理を行うことによって、電池セルCに含有されていた有価金属が回収されるのである。   And the valuable metal contained in the battery cell C is collect | recovered by performing collection | recovery processes, such as a crushing and leaching process, about the battery pack PB which performed the above discharge processes.

以上のごとく、本発明の方法によれば、ケースK内の電池セルCの電極に直接放電液ALが接触し、保護回路PSを通ることなく、電池セルCの電極間に電流を流すことができるので、保護回路PSが設けられている電池パックPBであっても、効率よく放電処理を行うことができる。
しかも、放電処理を行うための前処理は、電池パックPBを放電液ALに浸漬させる前に、ケースKに貫通孔hを形成するだけである。よって、放電処理を行うための前処理を簡単かつ容易に行うことができるから、前処理を行うことによる作業工数の増加や作業期間の延長を抑制することができる。
As described above, according to the method of the present invention, the discharge liquid AL is in direct contact with the electrode of the battery cell C in the case K, and a current can flow between the electrodes of the battery cell C without passing through the protection circuit PS. Therefore, even the battery pack PB provided with the protection circuit PS can perform the discharge process efficiently.
In addition, the pretreatment for performing the discharge treatment only forms the through hole h in the case K before the battery pack PB is immersed in the discharge liquid AL. Therefore, since the pretreatment for performing the discharge treatment can be performed easily and easily, an increase in work man-hours and an extension of the work period due to the pretreatment can be suppressed.

(貫通孔hについて)
なお、図1に示すように、貫通孔hを電池セル列の一端部と他端部にそれぞれ形成した場合には、上述したように迅速にケースK内を放電液ALで満たすことができることに加えて、放電処理の効率の低下も防ぐことができる。なぜなら、放電処理中は、電池セルCの負極表面で、2H2O+2e-→2OH-+H2↑なる反応により放電液ALの水成分が電気分解されて水素ガスが発生し、この水素ガスがケースK内に溜まれば水素ガスが絶縁部として機能し放電が中断する可能性があるが、図1に示すように貫通孔hを形成しておけば、水素ガスが抜けやすくなり、ケースK内に溜まることを防止することができるからである。
また、貫通孔hは、図1に示すように複数個設けてもよいが、一つだけ形成してもよい。例えば、電池セルCは通り抜けできないが、ケースK内に放電液ALをスムースに流入させることができ、また、水素ガス等をケースK内からスムースに排出させることができる程度の直径の貫通孔hを形成すれば、貫通孔hが一つだけでも、上記と同様の効果を得ることができる。
(About through hole h)
In addition, as shown in FIG. 1, when the through-hole h is each formed in the one end part and other end part of the battery cell row | line | column, the inside of case K can be rapidly filled with the discharge liquid AL as mentioned above. In addition, a reduction in the efficiency of the discharge process can be prevented. This is because during the discharge process, the water component of the discharge liquid AL is electrolyzed on the negative electrode surface of the battery cell C by the reaction 2H 2 O + 2e → 2OH + H 2 ↑ to generate hydrogen gas. If it accumulates in K, hydrogen gas may function as an insulating part and discharge may be interrupted. However, if a through hole h is formed as shown in FIG. This is because it can be prevented from accumulating.
Further, a plurality of through holes h may be provided as shown in FIG. 1, but only one may be formed. For example, although the battery cell C cannot pass through, the discharge hole AL can flow smoothly into the case K, and the through-hole h has such a diameter that hydrogen gas or the like can be discharged smoothly from the case K. The same effect as described above can be obtained even if only one through hole h is formed.

(貫通孔hの形成方法)
上記のごとき貫通孔hを形成する方法はとくに限定されないが、ペンチやドリル、カッターなどを使用して人が開口を形成してもよい。また、ケースKの一部を圧壊したり、ウオータージェットによりケースKの一部を切断したりする等の方法によって貫通孔hを形成してもよく、貫通孔hを形成する際にケースK内に収容されている電池セルCを損傷しないのであれば、どのような方法を採用してもよい。
(Method for forming through hole h)
A method for forming the through hole h as described above is not particularly limited, but a person may form the opening using a pliers, a drill, a cutter, or the like. Further, the through hole h may be formed by a method such as crushing a part of the case K or cutting a part of the case K with a water jet, and when the through hole h is formed, Any method may be adopted as long as the battery cell C accommodated in the battery is not damaged.

(放電液ALについて)
また、貫通孔hが形成された電池パックPBを浸漬させる放電液ALは、伝導性を有する液体であればとくに限定されず、塩化ナトリウム、硫酸ナトリウム、塩化カリウムなどの塩溶液や、塩酸や硫酸等を用いることができる。
とくに、塩化ナトリウム、硫酸ナトリウム、塩化カリウムなどの塩溶液を使用すれば、塩溶液自体が安価であるため、放電処理コストが低減できるという利点が得られる。また、pHがもともと中性の塩溶液による放電であれば後で中和する必要が無いため使用済みの放電液ALの処理も容易であるし、放電自体も効率よく進行するのなど処理コスト低減や処理スピード向上が図れるという利点も得られる。
なお、硫酸溶液も用いることができるが、硫酸濃度が濃すぎると電池セルC自体を腐食させ電解液が漏洩する可能性があり、かかる電解液の漏洩が発生すれば、後工程に影響する。よって、硫酸溶液を使用する場合には、その濃度が数%以下、pHで3〜5程度となるように調整して使用することが好ましい。
(About discharge liquid AL)
Further, the discharge liquid AL in which the battery pack PB in which the through hole h is formed is immersed is not particularly limited as long as it is a conductive liquid, and is a salt solution such as sodium chloride, sodium sulfate, potassium chloride, hydrochloric acid or sulfuric acid. Etc. can be used.
In particular, when a salt solution such as sodium chloride, sodium sulfate, or potassium chloride is used, the salt solution itself is inexpensive, so that an advantage of reducing the discharge treatment cost can be obtained. In addition, if the discharge is based on a neutral salt solution, it is not necessary to neutralize it later, so it is easy to treat the used discharge liquid AL, and the discharge itself progresses efficiently. In addition, there is an advantage that the processing speed can be improved.
A sulfuric acid solution can also be used. However, if the sulfuric acid concentration is too high, the battery cell C itself may be corroded and the electrolyte solution may leak, and if such electrolyte solution leaks, the subsequent process will be affected. Therefore, when using a sulfuric acid solution, it is preferable to adjust and use it so that the density | concentration may be several% or less and about pH 3-5.

本発明の電池パックの処理方法は、パソコンや電気自動車、電動自転車、電動二輪車、携帯電話、デジタルカメラ、電動工具、家庭用蓄電池等の電池パックに残留している電力を放電させる放電処理に適している。   The battery pack treatment method of the present invention is suitable for discharge treatment for discharging electric power remaining in a battery pack such as a personal computer, an electric vehicle, an electric bicycle, an electric two-wheeled vehicle, a mobile phone, a digital camera, an electric tool, and a household storage battery. ing.

PB 電池パック
C 電池セル
PS 保護回路
K ケース
h 貫通孔
PB Battery pack C Battery cell PS Protection circuit K Case h Through hole

Claims (2)

ケース内に複数の電池セルが収容された、保護回路を有する電池パックを処理する方法であって、
前記ケースに、該ケース内部と外部との間を連通する貫通孔を形成し、
該貫通孔が形成された電池パックを、電気伝導性を有する液体に浸漬する
ことを特徴とする電池パックの放電方法。
A method of processing a battery pack having a protection circuit, in which a plurality of battery cells are housed in a case,
In the case, a through hole that communicates between the inside of the case and the outside is formed,
A method for discharging a battery pack, comprising immersing the battery pack in which the through hole is formed in a liquid having electrical conductivity.
前記ケース内に、前記電池セルが複数列並んで収容されており、
前記ケースにおいて、前記電池セルが並んでいる方向の一端部と他端部に、前記貫通孔を形成する
ことを特徴とする請求項1記載の電池パックの放電方法。
The battery cells are accommodated in a plurality of rows in the case,
2. The battery pack discharging method according to claim 1, wherein in the case, the through hole is formed at one end and the other end in a direction in which the battery cells are arranged. 3.
JP2010170795A 2010-07-29 2010-07-29 Processing method of battery pack Pending JP2012033344A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012128952A (en) * 2010-12-13 2012-07-05 Sumitomo Metal Mining Co Ltd Battery pack processing apparatus and processing method
FR3009441A1 (en) * 2013-08-02 2015-02-06 Renault Sa DISCHARGE SYSTEM OF AN ELECTRIC BATTERY MODULE.
CN105057266A (en) * 2015-06-29 2015-11-18 天津力神电池股份有限公司 Lithium ion power battery metal casing impurity removal method
JP2023502147A (en) * 2019-12-31 2023-01-20 オメガ ハーベスド メトラーギカル,アイエヌシー Coke dust as static neutralizer for waste battery recycling and waste battery recycling method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012128952A (en) * 2010-12-13 2012-07-05 Sumitomo Metal Mining Co Ltd Battery pack processing apparatus and processing method
US8734972B2 (en) 2010-12-13 2014-05-27 Sumitomo Metal Mining Co., Ltd. Battery pack processing apparatus and processing method
FR3009441A1 (en) * 2013-08-02 2015-02-06 Renault Sa DISCHARGE SYSTEM OF AN ELECTRIC BATTERY MODULE.
CN105057266A (en) * 2015-06-29 2015-11-18 天津力神电池股份有限公司 Lithium ion power battery metal casing impurity removal method
JP2023502147A (en) * 2019-12-31 2023-01-20 オメガ ハーベスド メトラーギカル,アイエヌシー Coke dust as static neutralizer for waste battery recycling and waste battery recycling method
JP7295596B2 (en) 2019-12-31 2023-06-21 オメガ ハーベスド メトラーギカル,アイエヌシー Coke dust as static neutralizer for waste battery recycling and waste battery recycling method

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