JP2006260777A - Mounting structure of secondary battery - Google Patents

Mounting structure of secondary battery Download PDF

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JP2006260777A
JP2006260777A JP2005072417A JP2005072417A JP2006260777A JP 2006260777 A JP2006260777 A JP 2006260777A JP 2005072417 A JP2005072417 A JP 2005072417A JP 2005072417 A JP2005072417 A JP 2005072417A JP 2006260777 A JP2006260777 A JP 2006260777A
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secondary battery
battery
lithium cell
gas
mounting structure
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JP4496997B2 (en
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Kazuhiko Nakane
和彦 中根
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TDK Lambda 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a secondary battery securing a protective function even in case contents blow out from it and preventing smoking and firing. <P>SOLUTION: The inside of a casing 20 is partitioned into a battery compartment 22 and a substrate compartment 23, of which, the former 22 contains a battery stack consisting of a plurality of lithium cells 1, and the later 23 contains a printed board 31 mounting a protective circuit 11. Even if overvoltage is impressed from a charger 12 on a battery pack 10, and inner gas inside the lithium cells blows through an explosion-proof valve 27, the inner gas will not flow into the substrate compartment 23 since the casing 20 is separated into the battery compartment 22 and the substrate compartment, so that flashing from the protective circuit 11 is prevented, and then, protection from overcharging, overvoltage or the like of the lithium cells by the protective circuit 11 is continued. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

例えばリチウムイオン電池などの充放電可能な二次電池を実際に装置する際の二次電池の実装構造に関する。   For example, the present invention relates to a mounting structure for a secondary battery when a chargeable / dischargeable secondary battery such as a lithium ion battery is actually installed.

従来から二次電池として鉛蓄電池が一般的に使用されているが、近年、蓄電媒体として非常に高い電力密度をもち小型化が可能な、リチウムイオン電池が広く使用されてきている。図５にリチウムイオン電池の一形態であるラミネート型リチウムイオン電池の構造を示す。ラミネート型リチウムイオン電池としてのリチウムセル１は、例えばコバルト酸リチウム（ＬｉＣｏＯ２）やマンガン酸リチウム（ＬｉＭｎＯ２）などの正極材料２と例えばグラファイト（炭素）などの負極材料３との間に、絶縁のためセパレータ４を挿入し、これらを何層かに積層した積層構造体５とした後、この積層構造体５を電解液と共に上下からアルミラミネート６，６で封止した構造になっている。正極材料２及び負極材料３には、それぞれ正極電極２ａと負極電極３ａが形成されており、アルミラミネート６，６の貼り合わせ部分から外部へ突出している。なお、電極の取り出し方，形状，材質についてや、ラミネート電池全体の大きさなどは特に制限されず、種々のものがある。 Conventionally, lead-acid batteries are generally used as secondary batteries, but in recent years, lithium-ion batteries that have a very high power density and can be miniaturized have been widely used as power storage media. FIG. 5 shows a structure of a laminated lithium ion battery which is one form of the lithium ion battery. A lithium cell 1 as a laminated lithium ion battery is insulated between a positive electrode material 2 such as lithium cobaltate (LiCoO 2 ) and lithium manganate (LiMnO 2 ) and a negative electrode material 3 such as graphite (carbon). Therefore, after the separator 4 is inserted into a laminated structure 5 in which these layers are laminated, the laminated structure 5 is sealed with aluminum laminates 6 and 6 together with the electrolyte from above and below. The positive electrode material 2 and the negative electrode material 3 are formed with a positive electrode 2a and a negative electrode 3a, respectively, and project from the bonded portions of the aluminum laminates 6 and 6 to the outside. There are no particular restrictions on how to take out the electrode, the shape, the material, the size of the entire laminated battery, etc., and there are various types.

このような構造を有するリチウムセル１は、蓄電媒体として非常に高い電力密度をもつものの、高温時に可燃性ガスを発生する材料を使用しているため、電池に何らかの異常が発生した際に発煙，発火につながるリスクがある。リチウムセル１内部に発生する可燃性の内部ガスとしては、例えば、電解液の蒸発ガス（ジエチルカーボネート、エチレンカーボネート）や、セパレータ４から発生するＣＨ４，Ｃ２Ｈ４，Ｃ２Ｈ６などであり、リチウムセル１の高温時には、電池内部にこれらの内部ガスが発生してアルミラミネート６，６の膨張を引き起こす。この際、特許文献１に開示されるような、内部ガスの噴出方向を特定する噴出部としての防爆弁が設けられたものでは、電池内の圧力が所定値以上に上昇した場合に、この防爆弁から電池内の内部ガスを電池外へ放出して、ガス抜きすることにより爆発を防いでいる。 Although the lithium cell 1 having such a structure has a very high power density as a power storage medium, it uses a material that generates a flammable gas at a high temperature, and therefore emits smoke when some abnormality occurs in the battery. There is a risk of ignition. Examples of the flammable internal gas generated in the lithium cell 1 include electrolyte evaporation gas (diethyl carbonate, ethylene carbonate), CH 4 , C 2 H 4 , and C 2 H 6 generated from the separator 4. In addition, when the lithium cell 1 is at a high temperature, these internal gases are generated inside the battery, causing the aluminum laminates 6 and 6 to expand. At this time, in the case where an explosion-proof valve is provided as an ejection part for specifying the ejection direction of the internal gas as disclosed in Patent Document 1, when the pressure in the battery rises to a predetermined value or more, this explosion-proof The internal gas in the battery is released from the valve to the outside of the battery and vented to prevent explosion.

このように、リチウムセル１は、高温時に可燃性の内部ガスが発生し、最悪ケースとして発煙、発火に至る虞があった。そこで、この安全上の問題を解決する方策として、通常、電池の発煙，発火を防ぐための保護回路（例えば特許文献２）が、その電池パック内などに装置されている。特許文献１では、可燃性ガス等を検出した際に、二次電池への充電を禁止することにより、電池の発煙，発火を防いでいる。一般的に、当該保護回路は、リチウムセル１を電池パック内に実際に装置する際には、複数個のリチウムセル１を上下に重ねて形成された電池スタックの最上部に搭載される。
特開平１１−２８３５９９号公報 特開平８−２２２２７８号公報 Thus, in the lithium cell 1, combustible internal gas is generated at a high temperature, and in the worst case, there is a risk of causing smoke and ignition. Therefore, as a measure for solving this safety problem, a protection circuit (for example, Patent Document 2) for preventing battery smoke and ignition is usually installed in the battery pack. In Patent Document 1, when a combustible gas or the like is detected, the battery is prevented from being smoked and ignited by prohibiting charging of the secondary battery. Generally, when the lithium cell 1 is actually installed in a battery pack, the protection circuit is mounted on the top of a battery stack formed by stacking a plurality of lithium cells 1 up and down.
JP-A-11-283599 JP-A-8-222278

しかし、前記保護回路を設けても、何らかの原因でリチウムセル１内部で可燃性の内部ガスが発生し、外部へ噴出した場合には、発煙，発火のリスクが避けられないという不安感を払拭するには至っていなかった。リチウムセル１から内部ガスが噴出し、その上部に載置された保護回路に到達してしまうと、保護回路のショートによるスパーク現象などで可燃性の内部ガスに引火する虞がある。また、高温の内部ガスが保護回路に悪影響を及ぼすことにより、過電圧・過充電保護が機能しなくなり、リチウムセル１の発煙，発火を招く虞がある。   However, even if the protective circuit is provided, if a flammable internal gas is generated inside the lithium cell 1 for some reason and is ejected to the outside, anxiety that the risk of smoke and ignition is inevitable is eliminated. It was not reached. If the internal gas is ejected from the lithium cell 1 and reaches the protection circuit mounted on the lithium cell 1, there is a possibility that the combustible internal gas may be ignited due to a spark phenomenon due to a short circuit of the protection circuit. Moreover, when the high-temperature internal gas adversely affects the protection circuit, the overvoltage / overcharge protection may not function, and the lithium cell 1 may be smoked or ignited.

そこで本発明は上記問題点に鑑み、二次電池から内容物が噴出した場合でも二次電池の保護機能を確保し、二次電池の発煙，発火を未然に防ぐことが可能な二次電池の実装構造を提供することを目的とする。   Accordingly, in view of the above problems, the present invention provides a secondary battery protection function that ensures a secondary battery protection function even when contents are ejected from the secondary battery, and prevents secondary battery smoke and fire. An object is to provide a mounting structure.

本発明における請求項１の二次電池の実装構造では、充放電可能な二次電池と、前記二次電池を保護する制御部と、前記二次電池と前記制御部とを隔離する隔離手段とを備えている。   In the secondary battery mounting structure according to claim 1 of the present invention, a chargeable / dischargeable secondary battery, a control unit for protecting the secondary battery, and an isolating means for isolating the secondary battery and the control unit. It has.

このようにすると、隔離手段により制御部が二次電池から隔離されるため、二次電池から噴出した内容物に対して制御部への到達を阻止することができる。すなわち、可燃性の内容物と制御部の相互影響が断たれるため、制御部からの引火を防ぐと共に、二次電池の異常時でも制御部による二次電池の保護を継続することができる。   If it does in this way, since a control part is isolated from a secondary battery by the isolation | separation means, the arrival to a control part can be prevented with respect to the content which ejected from the secondary battery. That is, since the mutual influence between the combustible contents and the control unit is cut off, it is possible to prevent ignition from the control unit and to continue protection of the secondary battery by the control unit even when the secondary battery is abnormal.

本発明における請求項２の二次電池の実装構造では、前記隔離手段は、前記二次電池を収容する電池室と前記制御部を収容する制御室とが形成された外郭部材である。   In the secondary battery mounting structure according to the second aspect of the present invention, the isolation means is an outer member in which a battery chamber that houses the secondary battery and a control chamber that houses the control unit are formed.

このようにすると、外郭部材に電池室と制御室を設けることにより、二次電池と制御部とが別々の部屋に完全に隔離された状態で収容されるため、電池室内で二次電池から内容物が噴出しても、当該内容物が制御室に収容された制御部に到達することがない。すなわち、可燃性の内容物と制御部の相互影響が断たれるため、制御部からの引火を防ぐと共に、二次電池の異常時でも制御部による二次電池の保護を継続することができる。   In this case, by providing the battery chamber and the control chamber in the outer member, the secondary battery and the control unit are accommodated in a completely isolated state, so that the contents from the secondary battery in the battery chamber Even if an object is ejected, the contents do not reach the control unit accommodated in the control room. That is, since the mutual influence between the flammable contents and the control unit is cut off, it is possible to prevent ignition from the control unit and to continue protection of the secondary battery by the control unit even when the secondary battery is abnormal.

本発明における請求項３の二次電池の実装構造では、前記二次電池から噴出した内容物を集める回収部を設けている。   In the secondary battery mounting structure according to the third aspect of the present invention, there is provided a collection unit for collecting the contents ejected from the secondary battery.

このようにすると、二次電池から噴出した内容物を回収部に集めることができるため、二次電池周囲への流出を防ぐことができる。   In this way, since the contents ejected from the secondary battery can be collected in the recovery unit, it is possible to prevent outflow to the periphery of the secondary battery.

本発明における請求項４の二次電池の実装構造では、前記回収部が、前記内容物の噴出方向を特定する噴出部近傍に対向して設けられている。   In the secondary battery mounting structure according to a fourth aspect of the present invention, the recovery part is provided in the vicinity of the ejection part that specifies the ejection direction of the contents.

このようにすると、内容物が噴出部から噴出する勢いを利用して、そのまま回収部に進入させて、噴出直後の内容物を速やかに集めることができる。   If it does in this way, using the momentum which a content spouts from a spout part, it will enter into a recovery part as it is, and the contents immediately after spout can be collected quickly.

本発明の請求項１によると、二次電池から内容物が噴出した場合でも二次電池の保護機能を確保し、二次電池の発煙，発火を未然に防ぐことが可能な二次電池の実装構造を提供することができる。   According to the first aspect of the present invention, the secondary battery is mounted so as to ensure the protection function of the secondary battery even when the contents are ejected from the secondary battery, and to prevent the secondary battery from being smoked or ignited. Structure can be provided.

本発明の請求項２によると、二次電池と制御部を完全に隔離することができ、二次電池から内容物が噴出した場合でも確実に二次電池の保護機能を確保し、二次電池の発煙，発火を未然に防ぐことが可能な二次電池の実装構造を提供することができる。   According to the second aspect of the present invention, the secondary battery and the control unit can be completely separated, and even when the contents are ejected from the secondary battery, the secondary battery is reliably protected and the secondary battery is protected. It is possible to provide a secondary battery mounting structure that can prevent the occurrence of smoke and ignition.

本発明の請求項３によると、二次電池から噴出した内容物に対して二次電池周囲への流出を防ぎ、周囲への影響を最小限に抑えることができる。   According to the third aspect of the present invention, it is possible to prevent the contents ejected from the secondary battery from flowing out to the periphery of the secondary battery and to minimize the influence on the surroundings.

本発明の請求項４によると、噴出直後の内容物を速やかに回収し、二次電池周囲への流出を防ぎ、周囲への影響を最小限に抑えることができる。   According to claim 4 of the present invention, the contents immediately after the ejection can be quickly collected, the outflow to the periphery of the secondary battery can be prevented, and the influence on the surroundings can be minimized.

以下、添付図面を参照しながら、本発明における二次電池の実装構造の好ましい実施例を説明する。なお、従来例と同一箇所には同一符号を付し、共通する部分の説明は重複するため極力省略する。   Hereinafter, preferred embodiments of a secondary battery mounting structure according to the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same location as a prior art example, and since description of a common part overlaps, it abbreviate | omits as much as possible.

図１は、充放電可能な二次電池としてのリチウムセル１を電子機器などに装置する場合の概略構成を示すブロック図である。同図において、二次電池パックとしての電池パック10には、リチウムセル１が保護回路11と共に組み込まれている。保護回路11は、例えば電流ヒューズや、温度ヒューズや、過電圧保護などを備えたものであり、過電流，過電圧，温度異常時にリチウムセル１へ供給される充電電力を遮断し保護する。電池パック10の前段には、リチウムセル１に充電電力を注入して充電する充電器12が接続されている。充電器12は、安定化した充電電力を生成する安定化電源13と、当該充電電力を用いてリチウムセル１を充電する充電回路14とから構成される。充電回路14は、充電電圧又は充電電流を一定にしてリチウムセル１をリニア充電する定電圧・定電流回路や、充電電流をパルス状に供給してリチウムセル１をパルス充電するパルス充電回路などからなり、これらは電池の性能や寿命などにより適宜決定される。   FIG. 1 is a block diagram showing a schematic configuration when a lithium cell 1 as a chargeable / dischargeable secondary battery is installed in an electronic device or the like. In the figure, a lithium battery 1 and a protection circuit 11 are incorporated in a battery pack 10 as a secondary battery pack. The protection circuit 11 includes, for example, a current fuse, a temperature fuse, an overvoltage protection, and the like, and cuts off and protects the charging power supplied to the lithium cell 1 when overcurrent, overvoltage, or temperature is abnormal. A battery charger 12 for charging the lithium cell 1 by injecting charging power is connected to the front stage of the battery pack 10. The charger 12 includes a stabilized power source 13 that generates stabilized charging power, and a charging circuit 14 that charges the lithium cell 1 using the charging power. The charging circuit 14 includes a constant voltage / constant current circuit that linearly charges the lithium cell 1 with a constant charging voltage or charging current, a pulse charging circuit that pulse-charges the lithium cell 1 by supplying the charging current in pulses. These are appropriately determined depending on the performance and life of the battery.

図２は電池パック10の内部構成を示す斜視図であり、図３，４は電池パック10の構成を示す縦・横各方向から見た要部断面図である。電池パック10は、主に、その外郭を形成する外郭部材としてのケーシング20内に、複数のリチウムセル１が積層接続されてなる電池スタック26と、保護回路11の回路部品が実装されたプリント基板31とを収容して構成される。ケーシング20は、例えばアルミ材など放熱性に優れた部材を箱状に成形してなり、その内部空間は略中央に形成された隔離手段としての仕切板21により電池室22と基板室23とに仕切られている。電池室22には電池スタック26が収容される一方、基板室23にはプリント基板31が別々に収容される。   FIG. 2 is a perspective view showing the internal configuration of the battery pack 10, and FIGS. 3 and 4 are cross-sectional views of the main part of the configuration of the battery pack 10 as viewed from the vertical and horizontal directions. The battery pack 10 is mainly a printed circuit board in which a battery stack 26 in which a plurality of lithium cells 1 are stacked and connected in a casing 20 as an outer member forming the outer shell, and circuit components of the protection circuit 11 are mounted. 31 is configured. The casing 20 is formed of a member having excellent heat dissipation, such as an aluminum material, in a box shape, and its internal space is divided into a battery chamber 22 and a substrate chamber 23 by a partition plate 21 as a separating means formed substantially in the center. It is partitioned. A battery stack 26 is accommodated in the battery chamber 22, and a printed circuit board 31 is separately accommodated in the substrate chamber 23.

電池スタック26は複数のリチウムセル１を上下に段積みした構成となっており、各リチウムセル１間にアルミ板等の放熱性に優れた層間部材28が挿入されている。電池スタック26は、その中心部に熱が篭り易く、その中心部に位置するリチウムセル１は他のものに比べ高温になりやすい。放熱性に優れた層間部材28を各リチウムセル１間に設けることにより各リチウムセル１の熱が速やかに放熱されるため、電池スタック26の中心部に熱が篭らず、リチウムセル１の温度上昇を抑制することができる。電池スタック26を構成するリチウムセル１は、その表面にある程度の圧力をかけた方が電極と電解液の接触が良好となり寿命が延びる傾向があるため、電池スタック26は、上下から放熱板30，30により挟み込まれ、放熱板30，30がケーシング20に圧接することにより、電池スタック26に適当な圧力がかけられた状態で固定され、電池室22内に収容されている。また、放熱板30，30は、充放電時に発生する電池スタック26の熱をケーシング20に伝達して放熱させ、各リチウムセル１の温度上昇を抑制する。なお、本実施例のリチウムセル１には、正極電極２ａ及び負極電極３ａが設けられた反対側の端部に防爆弁27が設けられている。リチウムセル１ひいては電池スタック26の正極電極２ａ及び負極電極３ａは、仕切板21を貫通する接続ケーブル33によりプリント基板31に実装された保護回路11と電気的に接続されている。   The battery stack 26 has a configuration in which a plurality of lithium cells 1 are stacked one above the other, and an interlayer member 28 such as an aluminum plate that is excellent in heat dissipation is inserted between the lithium cells 1. The battery stack 26 tends to generate heat at the center thereof, and the lithium cell 1 located at the center tends to be hotter than the others. By providing the interlayer member 28 having excellent heat dissipation between the lithium cells 1, the heat of each lithium cell 1 is quickly dissipated, so that the heat does not flow in the center of the battery stack 26, and the temperature of the lithium cell 1 The rise can be suppressed. Since the lithium cell 1 constituting the battery stack 26 has a tendency that the contact between the electrode and the electrolyte solution becomes better and the life is extended when a certain amount of pressure is applied to the surface thereof. When the heat sinks 30 and 30 are pressed against the casing 20 by being sandwiched by 30, the battery stack 26 is fixed in an appropriate pressure state and is accommodated in the battery chamber 22. Further, the heat sinks 30, 30 transmit the heat of the battery stack 26 generated during charging / discharging to the casing 20 to dissipate the heat, and suppress the temperature rise of each lithium cell 1. The lithium cell 1 of this embodiment is provided with an explosion-proof valve 27 at the opposite end where the positive electrode 2a and the negative electrode 3a are provided. The positive electrode 2 a and the negative electrode 3 a of the lithium cell 1 and the battery stack 26 are electrically connected to the protection circuit 11 mounted on the printed circuit board 31 by a connection cable 33 that penetrates the partition plate 21.

電池室22には、電池スタック26の防爆弁27近傍に回収部としてのガス蓄積部25が設けられている。ガス蓄積部25は、リチウムセル１の過充電時などに防爆弁27から噴出した内容物としての内部ガス、すなわち発煙，発火に直結する電解液の蒸発ガス，揮発性有機ガスなどの内部ガスに含まれる可燃性物質を一箇所に集めるために設けられている。ガス蓄積部25の一壁面となり防爆弁27と対向する電池室22の壁面には、排出孔としてのガス抜き孔32が開口形成されている。また、ガス蓄積部25には、例えばアルミなど熱伝導性の良い部材からなるＬ字形の壁体24，24が、仕切板21とそれに対向する電池室22の壁面にそれぞれ取り付けられている。壁体24，24は、電池室22の両側壁から内側へ互い違いに突出し、防爆弁27に対向する位置となる電池室22の短手方向中程で一定距離を隔てて重なり合うように位置している。この２つの壁体24，24により、防爆弁27が設けられた電池スタック26の一端からガス抜き孔32が形成された電池室22の壁面に向けて蛇行する流路29が形成される。   In the battery chamber 22, a gas storage unit 25 as a recovery unit is provided near the explosion-proof valve 27 of the battery stack 26. The gas accumulating unit 25 is used for the internal gas as the contents ejected from the explosion-proof valve 27 when the lithium cell 1 is overcharged, that is, the internal gas such as smoke, the evaporation gas of the electrolyte solution directly connected to the ignition, or the volatile organic gas It is provided to collect combustible substances contained in one place. A gas vent hole 32 serving as a discharge hole is formed in the wall surface of the battery chamber 22 that becomes one wall surface of the gas storage unit 25 and faces the explosion-proof valve 27. In addition, L-shaped wall bodies 24 and 24 made of a member having good thermal conductivity such as aluminum are attached to the gas storage unit 25 on the partition plate 21 and the wall surface of the battery chamber 22 facing the partition plate 21, respectively. The wall bodies 24, 24 protrude inward from the both side walls of the battery chamber 22 and are positioned so as to overlap each other at a certain distance in the middle of the battery chamber 22, which is the position facing the explosion-proof valve 27. Yes. The two walls 24 and 24 form a flow path 29 that meanders from one end of the battery stack 26 provided with the explosion-proof valve 27 toward the wall surface of the battery chamber 22 in which the gas vent holes 32 are formed.

基板室23内に収容されたプリント基板31は、例えばネジ螺着などによりケーシング20に固定されている。このプリント基板31には、保護回路11を構成する例えばＭＯＳＦＥＴなどの発熱部品35が実装されており、発熱部品35がケーシング20の長手方向となる基板室23の側壁を形成するヒートシンク36に熱的に接続されている。ヒートシンク36は、図中では厚みのある扁平板状部材で形成されているが、複数のフィンなどを並設して放熱能力を高めてもよい。電池スタック26の充放電時には、この発熱部品35が発熱するため、ヒートシンク36により当該熱を放熱するようにしている。ヒートシンク36と直行し、ケーシング20の短手方向となる基板室23の壁面には、メインコネクタ41と警報用コネクタ40を露出させるための開口部が形成されている。メインコネクタ41は、プリント基板31に例えば半田付けなどで実装されることにより保護回路11と電気的接続されており、メインコネクタ41に図示しない充電器12が接続されることにより、電池スタック26を充電するための充電電力を電池パック10へ供給可能となる。警報用コネクタ40は、例えば過電圧・過充電保護による充電電力遮断時などに出力される警報信号を、保護回路11から外部へ取り出すために設けられている。   The printed circuit board 31 accommodated in the substrate chamber 23 is fixed to the casing 20 by, for example, screwing. The printed circuit board 31 is mounted with a heat generating component 35 such as a MOSFET constituting the protection circuit 11, and the heat generating component 35 is thermally applied to the heat sink 36 that forms the side wall of the substrate chamber 23 in the longitudinal direction of the casing 20. It is connected to the. Although the heat sink 36 is formed of a thick flat plate member in the drawing, a plurality of fins and the like may be arranged in parallel to increase the heat dissipation capability. When the battery stack 26 is charged and discharged, the heat generating component 35 generates heat, so that the heat is radiated by the heat sink 36. An opening for exposing the main connector 41 and the alarm connector 40 is formed in the wall surface of the substrate chamber 23 which is orthogonal to the heat sink 36 and is in the short direction of the casing 20. The main connector 41 is electrically connected to the protection circuit 11 by being mounted on the printed circuit board 31 by, for example, soldering, and the battery stack 26 is connected to the main connector 41 by connecting the charger 12 (not shown). Charging power for charging can be supplied to the battery pack 10. The alarm connector 40 is provided for taking out an alarm signal output from the protection circuit 11 to the outside, for example, when charging power is interrupted by overvoltage / overcharge protection.

次に、電池パック10の過電圧・過充電時における作用について説明する。   Next, the operation of the battery pack 10 during overvoltage / overcharge will be described.

充電器12から電池パック10へ過電圧が印加されるとリチウムセル１内部の電解液分解が加速され、熱が発生してリチウムセル１の温度上昇が始まる。それと同時に、リチウムセル１内部に電解液の蒸発ガスが発生してアルミラミネート６，６の膨張を引き起こす。さらに温度上昇が進み電解液の熱分解が発生すると、例えばＣＨ４，Ｃ２Ｈ４，Ｃ２Ｈ６などの揮発性有機ガスが発生する。このとき、リチウムセル１内の圧力が所定値以上に上昇すると、防爆弁27からリチウムセル１内の前記電解液の蒸発ガスや揮発性有機ガスなどの内部ガスが噴出する。防爆弁27がないものや、防爆弁27が詰まっているなどの異常がある場合は、リチウムセル１のアルミラミネート６，６の封止が破れ、そこから内部ガスが噴出する。電池スタック26を覆うケーシング20の内部空間は、仕切板21により電池室22と基板室23とに仕切られ、両者が気密状態に隔離されているため、電池スタック26が収容された電池室22から基板室23へ内部ガスが流入することがなく、プリント基板31に実装された保護回路11からの着火や、保護回路11への悪影響を防止することができる。すなわち、可燃性の内部ガスと保護回路11の相互影響が断たれるため、保護回路11からの引火を防ぐと共に、リチウムセル１の異常時でも保護回路11によるリチウムセル１の過充電・過電圧等の保護を継続することができる。このように、電池スタック26をケーシング20に形成された電池室22に収容することにより、保護回路11の異常などによりリチウムセル１のどの部分から内部ガスが噴出しても、まずリチウムセル１を覆うケーシング20により内部ガスが電池室22ひいてはケーシング20内に留められ、基板室23や電池パック10外部へ漏れ出すことがない。 When an overvoltage is applied from the charger 12 to the battery pack 10, decomposition of the electrolyte in the lithium cell 1 is accelerated, heat is generated, and the temperature of the lithium cell 1 starts to rise. At the same time, an evaporation gas of the electrolytic solution is generated inside the lithium cell 1 to cause the aluminum laminates 6 and 6 to expand. When the temperature rises further and thermal decomposition of the electrolyte occurs, volatile organic gases such as CH 4 , C 2 H 4 , and C 2 H 6 are generated. At this time, when the pressure in the lithium cell 1 rises to a predetermined value or more, an internal gas such as an evaporation gas or a volatile organic gas of the electrolyte in the lithium cell 1 is ejected from the explosion-proof valve 27. When there is an abnormality such as the one without the explosion-proof valve 27 or the explosion-proof valve 27 being clogged, the sealing of the aluminum laminates 6 and 6 of the lithium cell 1 is broken, and the internal gas is ejected therefrom. The internal space of the casing 20 that covers the battery stack 26 is partitioned into a battery chamber 22 and a substrate chamber 23 by a partition plate 21, and both are isolated in an airtight state, and therefore, from the battery chamber 22 in which the battery stack 26 is accommodated. Internal gas does not flow into the substrate chamber 23, and ignition from the protection circuit 11 mounted on the printed circuit board 31 and adverse effects on the protection circuit 11 can be prevented. That is, since the mutual influence between the flammable internal gas and the protection circuit 11 is cut off, the ignition from the protection circuit 11 is prevented, and overcharge / overvoltage of the lithium cell 1 by the protection circuit 11 even when the lithium cell 1 is abnormal. Protection can continue. In this way, by accommodating the battery stack 26 in the battery chamber 22 formed in the casing 20, no matter what part of the lithium cell 1 is blown out due to an abnormality of the protection circuit 11, the lithium cell 1 is first extracted. The covering casing 20 keeps the internal gas in the battery chamber 22 and thus in the casing 20, and does not leak out of the substrate chamber 23 or the battery pack 10.

リチウムセル１から噴出した内部ガスは、防爆弁27近傍に設けられたガス蓄積部25により一箇所に集められる。まず、防爆弁27から噴出した内部ガスは、防爆弁27に対向して設けられたガス蓄積部25の壁体24に衝突する。壁体24は、ケーシング20と熱的に接続され、内部ガスに比べ著しく温度が低い状態になっているため、壁体24表面上に内部ガスが結露し、液状になる。本実施例では、ガス蓄積部25の壁体24が、内部ガスの噴出方向に位置するように、防爆弁27に対向，近接して設けられている。そのため、内部ガスの防爆弁27から噴出する勢いを利用して、そのまま流路29に進入させ、噴出直後の内部ガスを速やかに回収することができる。その後、内部ガスは流路29を流れるが、流路29はその表面積が大きくなるよう蛇行しているため、流路29を流れていく間に、壁体24，24及びガス蓄積部25の壁面を形成するケーシング20に、可燃性物質を含む内部ガスが次第に結露していき、ガス蓄積部25内で可燃性ガス濃度が低下することとなる。そして、流路29を流れる内部ガスは、最終的にガス抜き孔32からケーシング20外部へ排出される。当該排出ガスは可燃性ガス濃度が十分に低いものであるため、電池パック10の周囲に影響を及ぼすことがなく、ケーシング20の内部圧力が異常上昇することもない。なお、ガス蓄積部25に蓄積された液状の内部ガスは、後ほどガス蓄積部25から取り出され適当な処理が施される。流路29をガス抜き孔32方向へ向けて傾斜させて形成しておくと、液化した内部ガスの粘度が低ければガス抜き孔32付近に簡単に集めることができる。この場合、ガス抜き孔32を下方若しくは底面に設けて、ガス抜き孔32から排液するようにしてもよい。   The internal gas ejected from the lithium cell 1 is collected in one place by the gas accumulation part 25 provided in the vicinity of the explosion-proof valve 27. First, the internal gas ejected from the explosion-proof valve 27 collides with the wall body 24 of the gas accumulation unit 25 provided to face the explosion-proof valve 27. Since the wall body 24 is thermally connected to the casing 20 and is in a state where the temperature is significantly lower than that of the internal gas, the internal gas condenses on the surface of the wall body 24 and becomes liquid. In the present embodiment, the wall body 24 of the gas accumulating portion 25 is provided so as to face and close to the explosion-proof valve 27 so as to be positioned in the direction in which the internal gas is ejected. Therefore, using the momentum of the internal gas ejected from the explosion-proof valve 27, the gas can enter the flow path 29 as it is, and the internal gas immediately after the ejection can be quickly recovered. Thereafter, the internal gas flows through the flow path 29, but the flow path 29 meanders so as to increase its surface area, so that the wall bodies 24 and 24 and the wall surfaces of the gas storage section 25 are flown through the flow path 29. The internal gas containing the combustible substance gradually condenses on the casing 20 that forms the gas, and the combustible gas concentration in the gas storage unit 25 decreases. Then, the internal gas flowing through the flow path 29 is finally discharged from the gas vent hole 32 to the outside of the casing 20. Since the exhaust gas has a sufficiently low combustible gas concentration, it does not affect the periphery of the battery pack 10 and the internal pressure of the casing 20 does not rise abnormally. The liquid internal gas accumulated in the gas accumulation unit 25 is taken out from the gas accumulation unit 25 later and subjected to appropriate processing. If the flow path 29 is formed to be inclined toward the gas vent hole 32, it can be easily collected near the gas vent hole 32 if the viscosity of the liquefied internal gas is low. In this case, the gas vent hole 32 may be provided below or on the bottom surface to drain the liquid from the gas vent hole 32.

以上のように本実施例の二次電池の実装構造では、充放電可能な二次電池としてのリチウムセル１（電池スタック26）と、リチウムセル１を保護する制御部としての保護回路11と、リチウムセル１と保護回路11とを隔離する隔離手段としての仕切板21とを備えている。   As described above, in the secondary battery mounting structure of the present embodiment, the lithium cell 1 (battery stack 26) as a chargeable / dischargeable secondary battery, and the protection circuit 11 as a control unit for protecting the lithium cell 1, A partition plate 21 is provided as an isolation means for isolating the lithium cell 1 and the protection circuit 11.

このようにすると、仕切板21により保護回路11がリチウムセル１から隔離されるため、リチウムセル１から噴出した内容物としての内部ガスに対して保護回路11への到達を阻止することができる。すなわち、可燃性の内部ガスと保護回路11の相互影響が断たれるため、保護回路11からの引火を防ぐと共に、リチウムセル１の異常時でも保護回路11によるリチウムセル１の保護を継続することができる。以上より、リチウムセル１から内部ガスが噴出した場合でもリチウムセル１の保護機能を確保し、リチウムセル１の発煙，発火を未然に防ぐことが可能な二次電池の実装構造を提供することができる。   In this way, since the protection circuit 11 is isolated from the lithium cell 1 by the partition plate 21, it is possible to prevent the internal gas as the contents ejected from the lithium cell 1 from reaching the protection circuit 11. That is, the mutual influence between the combustible internal gas and the protection circuit 11 is cut off, so that the ignition from the protection circuit 11 is prevented and the protection of the lithium cell 1 by the protection circuit 11 is continued even when the lithium cell 1 is abnormal. Can do. As described above, it is possible to provide a secondary battery mounting structure that can secure the protection function of the lithium cell 1 even when internal gas is ejected from the lithium cell 1 and can prevent the smoke and ignition of the lithium cell 1 in advance. it can.

また本実施例の二次電池の実装構造では、前記隔離手段は、リチウムセル１を収容する電池室22と保護回路11を収容する制御室としての基板室23とが形成された外郭部材としてのケーシング20である。   Further, in the secondary battery mounting structure of the present embodiment, the isolation means is an outer member in which a battery chamber 22 that houses the lithium cell 1 and a substrate chamber 23 that serves as a control chamber that houses the protection circuit 11 are formed. Casing 20.

このようにすると、ケーシング20に電池室22と基板室23を設けることにより、リチウムセル１と保護回路11とが別々の部屋に完全に隔離された状態で収容されるため、電池室22内でリチウムセル１から内部ガスが噴出しても、当該内部ガスが基板室23に収容された保護回路11に到達することがない。すなわち、可燃性の内部ガスと保護回路11の相互影響が断たれるため、保護回路11からの引火を防ぐと共に、リチウムセル１の異常時でも保護回路11によるリチウムセル１の保護を継続することができる。以上より、リチウムセル１と保護回路11を完全に隔離することができ、リチウムセル１から内部ガスが噴出した場合でも確実にリチウムセル１の保護機能を確保し、リチウムセル１の発煙，発火を未然に防ぐことが可能な二次電池の実装構造を提供することができる。   In this case, by providing the battery chamber 22 and the substrate chamber 23 in the casing 20, the lithium cell 1 and the protection circuit 11 are accommodated in separate rooms in a completely isolated state. Even if the internal gas is ejected from the lithium cell 1, the internal gas does not reach the protection circuit 11 accommodated in the substrate chamber 23. That is, the mutual influence between the combustible internal gas and the protection circuit 11 is cut off, so that the ignition from the protection circuit 11 is prevented and the protection of the lithium cell 1 by the protection circuit 11 is continued even when the lithium cell 1 is abnormal. Can do. As described above, the lithium cell 1 and the protection circuit 11 can be completely isolated, and even when the internal gas is ejected from the lithium cell 1, the protection function of the lithium cell 1 is ensured, and the smoke and ignition of the lithium cell 1 are ensured. It is possible to provide a secondary battery mounting structure that can be prevented in advance.

さらに本実施例の二次電池の実装構造では、リチウムセル１から噴出した内部ガスを集める回収部としてのガス蓄積部25を設けている。   Furthermore, in the secondary battery mounting structure of the present embodiment, a gas storage unit 25 is provided as a recovery unit for collecting the internal gas ejected from the lithium cell 1.

このようにすると、リチウムセル１から噴出した内部ガスをガス蓄積部25に集めることができるため、リチウムセル１周囲への流出を防ぐことができる。従って、リチウムセル１から噴出した内部ガスに対してリチウムセル１周囲への流出を防ぎ、周囲への影響を最小限に抑えることができる。   In this way, since the internal gas ejected from the lithium cell 1 can be collected in the gas storage unit 25, the outflow to the periphery of the lithium cell 1 can be prevented. Accordingly, it is possible to prevent the internal gas ejected from the lithium cell 1 from flowing out to the periphery of the lithium cell 1 and to minimize the influence on the surroundings.

また本実施例の二次電池の実装構造では、ガス蓄積部25が、内部ガスの噴出方向を特定する噴出部としての防爆弁27近傍に対向して設けられている。   Further, in the secondary battery mounting structure of the present embodiment, the gas accumulating portion 25 is provided in the vicinity of the explosion-proof valve 27 as an ejection portion for specifying the ejection direction of the internal gas.

このようにすると、内部ガスが防爆弁27から噴出する勢いを利用して、そのままガス蓄積部25に進入させて、噴出直後の内部ガスを速やかに集めることができる。従って、噴出直後の内部ガスを速やかに回収し、リチウムセル１周囲への流出を防ぎ、周囲への影響を最小限に抑えることができる。   In this way, the internal gas immediately after the jetting can be quickly collected by using the momentum of the jetting of the internal gas from the explosion-proof valve 27 and entering the gas accumulating unit 25 as it is. Therefore, the internal gas immediately after ejection can be quickly recovered, the outflow to the periphery of the lithium cell 1 can be prevented, and the influence on the environment can be minimized.

なお、本発明は、上記実施例に限定されるものではなく、本発明の趣旨を逸脱しない範囲で変更可能である。本発明が適用可能な二次電池は、リチウムイオン電池に限らず、過電圧・過充電時などに内部ガスなどの内容物を噴出するものであれば、どのようなものでもよい。また、保護回路11をリチウムセル１から隔離可能であればケーシング20に収容しなくてもよい。さらに、ガス蓄積部25での結露量を増加させるために、流路29に複数のフィンを並設して冷却性能を向上させるよう構成してもよく、冷却ファンによる空冷や水冷など種々のものが考えられる。   In addition, this invention is not limited to the said Example, It can change in the range which does not deviate from the meaning of this invention. The secondary battery to which the present invention can be applied is not limited to a lithium ion battery, and may be any battery as long as the contents such as internal gas are ejected at the time of overvoltage / overcharge. Further, the protection circuit 11 may not be accommodated in the casing 20 as long as it can be isolated from the lithium cell 1. Further, in order to increase the amount of condensation in the gas storage unit 25, a plurality of fins may be arranged in parallel in the flow path 29 to improve the cooling performance, and various things such as air cooling and water cooling by a cooling fan may be used. Can be considered.

本発明の第１実施例における二次電池の実装構造の構成を示すブロック図である。It is a block diagram which shows the structure of the mounting structure of the secondary battery in 1st Example of this invention. 同上、二次電池の実装構造の構成を示す斜視図である。It is a perspective view which shows the structure of the mounting structure of a secondary battery same as the above. 同上、二次電池の実装構造の構成を示す要部横断面図である。It is a principal part cross-sectional view which shows the structure of the mounting structure of a secondary battery same as the above. 同上、二次電池の実装構造の構成を示す要部横縦面図である。It is a principal part horizontal longitudinal view which shows the structure of the mounting structure of a secondary battery same as the above. ラミネート型リチウムイオン電池の内部構成を示す分解斜視図である。It is a disassembled perspective view which shows the internal structure of a laminate type lithium ion battery.

符号の説明Explanation of symbols

１ リチウムセル（二次電池）
11 保護回路（制御部）
20 ケーシング（外郭部材）
21 仕切板（隔離手段）
22 電池室
23 基板室（制御室）
25 ガス蓄積部（回収部）
27 防爆弁（噴出部）
1 Lithium cell (secondary battery)
11 Protection circuit (control unit)
20 Casing (outer member)
21 Partition plate (isolation means)
22 Battery compartment
23 Board room (control room)
25 Gas storage unit (recovery unit)
27 Explosion-proof valve (spout part)

Claims (4)

充放電可能な二次電池と、前記二次電池を保護する制御部と、前記二次電池と前記制御部とを隔離する隔離手段とを備えたことを特徴とする二次電池の実装構造。 A secondary battery mounting structure comprising: a chargeable / dischargeable secondary battery; a control unit that protects the secondary battery; and an isolation unit that isolates the secondary battery and the control unit. 前記隔離手段は、前記二次電池を収容する電池室と前記制御部を収容する制御室とが形成された外郭部材であることを特徴とする請求項１記載の二次電池の実装構造。 2. The mounting structure for a secondary battery according to claim 1, wherein the isolation means is an outer member in which a battery chamber that houses the secondary battery and a control chamber that houses the control unit are formed. 前記二次電池から噴出した内容物を集める回収部を設けたことを特徴とする請求項１又は請求項２記載の二次電池の実装構造。 The mounting structure for a secondary battery according to claim 1, further comprising a collection unit that collects contents ejected from the secondary battery. 前記回収部が、前記内容物の噴出方向を特定する噴出部近傍に対向して設けられたことを特徴とする請求項３記載の二次電池の実装構造。

The mounting structure for a secondary battery according to claim 3, wherein the recovery unit is provided in the vicinity of a jetting part that specifies a jetting direction of the contents.

JP2005072417A 2005-03-15 2005-03-15 Secondary battery mounting structure Expired - Fee Related JP4496997B2 (en)

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JP2006318676A (en) * 2005-05-10 2006-11-24 Sanyo Electric Co Ltd Battery module
JP2008218210A (en) * 2007-03-05 2008-09-18 Lenovo Singapore Pte Ltd Battery pack and portable electronic device
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JP2018190578A (en) * 2017-05-01 2018-11-29 株式会社豊田自動織機 Battery pack

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JPH10294097A (en) * 1997-02-24 1998-11-04 Mitsubishi Electric Corp Thin type cell
JP2000048784A (en) * 1998-07-29 2000-02-18 Fuji Photo Film Co Ltd Cell for camera, and capacitor
JP2002124221A (en) * 2000-08-11 2002-04-26 Sony Corp Electrolyte penetration preventing structure and battery device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006318676A (en) * 2005-05-10 2006-11-24 Sanyo Electric Co Ltd Battery module
JP2008218210A (en) * 2007-03-05 2008-09-18 Lenovo Singapore Pte Ltd Battery pack and portable electronic device
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JPWO2017183227A1 (en) * 2016-04-19 2019-03-22 ヤマハ発動機株式会社 Flexible sealed storage cell, storage module and storage pack
JP2018190578A (en) * 2017-05-01 2018-11-29 株式会社豊田自動織機 Battery pack

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