JP7802893B2 - Battery pack - Google Patents
Battery packInfo
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- JP7802893B2 JP7802893B2 JP2024196518A JP2024196518A JP7802893B2 JP 7802893 B2 JP7802893 B2 JP 7802893B2 JP 2024196518 A JP2024196518 A JP 2024196518A JP 2024196518 A JP2024196518 A JP 2024196518A JP 7802893 B2 JP7802893 B2 JP 7802893B2
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- cell
- negative electrode
- battery pack
- positive electrode
- cell group
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/143—Fireproof; Explosion-proof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Description
本願は、２０２４年０３月２９日に中国特許庁に提出された、出願番号が２０２４２０６４６９７７Ｘの中国特許出願の優先権を主張しており、当該出願のすべての内容は、引用により本願に組み込まれている。
本願は、電池の技術分野に関し、特に電池パックに関する。
This application claims priority from a Chinese patent application bearing application number 202420646977X, filed with the China Patent Office on March 29, 2024, the entire contents of which are incorporated herein by reference.
This application relates to the technical field of batteries, and more particularly to battery packs.
新エネルギー自動車技術の急速な進歩と市場の継続的な拡大に伴い、純粋な電気自動車の航続距離と充電レートは、ユーザの関心が高まる中核的な指標となっている。市場の需要を満たすために、パワーバッテリーのエネルギー密度要件は増加し続けており、高ニッケル正極とシリコンカーボン負極が徐々に主流の技術ルートになってきている。ただし、セルのエネルギーが増加するにつれて、動作中に発生する熱も急激に増加する。特にハイレートで充電する条件では、セルの発熱問題が顕著となり、温度管理が非常に困難になる。 With the rapid progress of new energy vehicle technology and the continuous expansion of the market, the driving range and charging rate of pure electric vehicles have become core indicators of growing user interest. To meet market demand, the energy density requirements of power batteries continue to increase, with high-nickel cathodes and silicon-carbon anodes gradually becoming the mainstream technology route. However, as the cell energy increases, the heat generated during operation also increases dramatically. Especially under high-rate charging conditions, the problem of cell heat generation becomes more pronounced, making temperature control extremely difficult.
関連技術における円筒形電池パックの冷却手段、例えば液冷板などによる間接的な液冷技術では、ローレートで充電する場合の発熱の問題をある程度低減できるが、ハイレートで充電する場合では、冷却効率が明らかに不十分であり、セルに熱暴走が発生した場合、セルの防爆弁から炎が発せられ、バスバーが溶断して電池パックから飛び出されやすく、乗員の安全を脅かす。 Related technologies for cooling cylindrical battery packs, such as indirect liquid cooling using liquid cooling plates, can reduce the heat generation problem to some extent when charging at low rates, but the cooling efficiency is clearly insufficient when charging at high rates. If thermal runaway occurs in a cell, flames can be emitted from the cell's explosion-proof valve, causing the busbar to melt and be easily ejected from the battery pack, posing a threat to the safety of passengers.
技術的解決手段は以下の通りである
本願は、
電池パックであって、
一方の側が開放した収容室を有するハウジングと、
前記ハウジングの開放側に覆設され、前記収容室を密閉させる蓋体と、
前記収容室内に設けられ、その電極が前記蓋体に面するセル群と、
前記セル群と前記蓋体との間に設けられ、前記蓋体との間に圧力リリーフスペースが予め残っているバスバーと、を含み、
前記収容室内に絶縁冷却油が注入されており、前記セル群の電極及び前記バスバーは、前記絶縁冷却油中に浸漬されている電池パックを提供する。
The technical solution is as follows:
A battery pack,
a housing having a chamber open on one side;
a lid provided on an open side of the housing to seal the storage chamber;
a group of cells provided in the storage chamber, the electrodes of which face the lid;
a bus bar provided between the cell group and the lid, with a pressure relief space remaining between the bus bar and the lid;
The battery pack has insulating and cooling oil poured into the housing chamber, and the electrodes of the cell group and the bus bars are immersed in the insulating and cooling oil.
有益な効果は以下の通りである。
収容室内に絶縁冷却油を注入し、液体の対流熱伝達原理を利用して、セル群を効率的に冷却する。セルに熱暴走が発生した場合、防爆弁から発せられる炎が圧力リリーフスペースで絶縁冷却油により直接消火され、また、前記圧力リリーフスペースは、バスバーのためのスペースを十分に提供し、それによって、電池パックが機械的衝撃を受けたときに、バスバーに電気的短絡の問題が発生しにくくなる。さらに、絶縁冷却油が存在することにより、バスバーは電池の熱暴走により溶断することもなく、それによって、電池パックの安全性が大幅に向上する。
The beneficial effects are as follows:
Insulating and cooling oil is injected into the chamber, and the cells are efficiently cooled using the principle of liquid convection heat transfer. If thermal runaway occurs in a cell, flames emanating from the explosion-proof valve are directly extinguished by the insulating and cooling oil in the pressure relief space. The pressure relief space also provides ample space for the busbars, making it less likely for electrical short circuits to occur in the busbars when the battery pack is subjected to mechanical shock. Furthermore, the presence of insulating and cooling oil prevents the busbars from melting due to thermal runaway, significantly improving the safety of the battery pack.
本願の実施例１は、図１～図６に示すように、電池パックを開示する。この電池パックは、ハウジング１と、蓋体２と、セル群３と、バスバー４と、を含む。本実施例１では、前記ハウジング１は、一方の側が開放した収容室１１を有する矩形ハウジング１であり、前記蓋体２は、前記ハウジング１の開放側に覆設され、前記収容室１１を密閉させる。前記セル群３は、複数列のセル３１を含み、各列のセル３１は、千鳥状に配列され、それにより、スペースの最大化が図られる。前記セル群３は、前記収容室１１内に配置される。なお、図３に示すように、前記バスバー４と前記蓋体２との間に圧力リリーフスペース６が予め残っており、セル３１の発熱量が大きく、温度が制御されにくいという問題に対して、この電池パックは、収容室１１内に絶縁冷却油を注入し、液体の対流熱伝達原理を利用して、セル群３を効率的に冷却する。また、セル群３の安全な固定に関しては、この電池パックでは、セル群３の少なくとも一方の側とハウジング１との間に固定層５が設けられ、収容室１１内のセル群３の安定性を高める。最後に、絶縁冷却油が存在することにより、バスバー４は電池の熱暴走により溶断することはなく、それによって、電池パックの安全性が大幅に向上する。セル３１に熱暴走が発生した場合、防爆弁から発せられる炎が圧力リリーフスペース６で絶縁冷却油により直接消火され、また、前記圧力リリーフスペース６は、バスバー４のためのスペースを十分に提供し、それによって、電池パックが機械的衝撃を受けたときに、バスバー４に電気的短絡の問題が発生しにくくなる。 Example 1 of the present application discloses a battery pack as shown in Figures 1 to 6. This battery pack includes a housing 1, a lid 2, a cell group 3, and a bus bar 4. In Example 1, the housing 1 is a rectangular housing 1 having a storage chamber 11 open on one side, and the lid 2 is attached to the open side of the housing 1 to seal the storage chamber 11. The cell group 3 includes multiple rows of cells 31, and the cells 31 in each row are arranged in a staggered pattern to maximize space. The cell group 3 is disposed within the storage chamber 11. As shown in Figure 3, a pressure relief space 6 remains between the bus bar 4 and the lid 2. This causes the cells 31 to generate large amounts of heat, making temperature control difficult. To address this issue, this battery pack injects insulating cooling oil into the storage chamber 11 and utilizes the principle of liquid convection heat transfer to efficiently cool the cell group 3. To ensure the safe fixation of the cell group 3, this battery pack includes a fixing layer 5 between at least one side of the cell group 3 and the housing 1, enhancing the stability of the cell group 3 within the storage chamber 11. Finally, the presence of insulating and cooling oil prevents the busbars 4 from melting due to thermal runaway of the battery, thereby significantly improving the safety of the battery pack. In the event of thermal runaway in a cell 31, flames emanating from the explosion-proof valve are directly extinguished by the insulating and cooling oil in the pressure relief space 6. Furthermore, the pressure relief space 6 provides ample space for the busbars 4, making it less likely that an electrical short circuit will occur in the busbars 4 when the battery pack is subjected to mechanical shock.
いくつかの実施形態では、前記セル群３の少なくとも一方の側と前記ハウジング１との間に固定層５が設けられる。いくつかの実施形態では、前記固定層５は、ポッティング接着剤であり、前記セル群３を前記収容室１１内に固定するものである。最も好ましくは、前記ポッティング接着剤の注入量は、固定層５がセル３１の少なくとも三分の一を固定することを可能にする。したがって、前記固定層５では、若干のセル溝５１がセル群３内の各セル３１に対応して形成され、前記セル溝５１及び前記セル群３内のセル３１の数、サイズ及び形状がすべて一致する。接着剤注入手段によって、電池パックの構造全体の安定性が向上し、振動や衝撃を受けたセル３１の変位や損壊が少なくなる。前記バスバー４は、前記固定層５を避けて前記セル群３の電極に接続されなければならない。 In some embodiments, a fixing layer 5 is provided between at least one side of the cell group 3 and the housing 1. In some embodiments, the fixing layer 5 is a potting adhesive that fixes the cell group 3 within the accommodating chamber 11. Most preferably, the amount of potting adhesive injected allows the fixing layer 5 to fix at least one-third of the cells 31. Therefore, the fixing layer 5 has a number of cell grooves 51 formed in it corresponding to each cell 31 in the cell group 3, and the number, size, and shape of the cell grooves 51 and the cells 31 in the cell group 3 all match. The adhesive injection means improves the stability of the overall battery pack structure and reduces displacement and damage of cells 31 due to vibration or impact. The busbars 4 must be connected to the electrodes of the cell group 3, avoiding the fixing layer 5.
なお、いくつかの実施形態では、前記固定層５は、穴あきボトムガード、発泡ゴムまたはブラケットなどを含むが、これらに限定されるものではなく、セル群３を固定できるものであればよいが、本実施例では、特に限定されない。同様に、前記ハウジング１は、他の形状の構造としてもよく、セル３１は、角形セルや円筒形セルを含む。 In some embodiments, the fixing layer 5 may include, but is not limited to, a perforated bottom guard, foam rubber, or a bracket, as long as it can fix the cell group 3, but in this embodiment, there is no particular limitation. Similarly, the housing 1 may have a structure with a different shape, and the cells 31 may be rectangular or cylindrical.
組み立てる際には、図２に示すように、ハウジング１の開放部を上にして、セル３１をハウジング１内の収容室１１の底部に均等に配置し、次に、収容室１１に接着剤を注入し、接着剤注入高さについては、セル３１同士を安定的に固定し、揺れにくくすることができればよい。その後、セル群３の天面にバスバー４を取り付け、若干のセル３１の正極と負極を集めて、正極と負極の集合体にする。最後に、前記蓋体２をカバーして、収容室１１の上部を閉鎖し、密閉させた収容室１１内に、熱を循環的に交換する絶縁冷却油を注入する。また、前記セル群３の電極及び前記バスバー４は、前記絶縁冷却油内に浸漬されなければならない。 To assemble, as shown in Figure 2, place the open end of the housing 1 facing up and evenly arrange the cells 31 at the bottom of the storage chamber 11 inside the housing 1. Next, pour adhesive into the storage chamber 11. The height of the adhesive should be such that the cells 31 are stably fixed together and do not easily shake. Next, attach the bus bar 4 to the top of the cell group 3, and gather the positive and negative electrodes of some of the cells 31 together to form a positive and negative electrode assembly. Finally, cover the lid 2 to close the top of the storage chamber 11. Then, pour insulating cooling oil into the sealed storage chamber 11 to circulate heat. The electrodes of the cell group 3 and the bus bar 4 must be immersed in the insulating cooling oil.
使用に際しては、上記の電池パックを逆様にして自動車内に配置し、前記電池パックの蓋体２、セル３１のセル正極３２及びバスバー４がすべて下方に位置するようにする。このような構成では、乗員の安全をできるだけ確保することができ、蓋体２を下にした電池パックは、電池パックの上方にいるユーザにとって有利である。その原理は以下の通りである。電池パック内のセル３１が動作して発熱すると、絶縁冷却油との熱交換を通じて降温し、機械的衝撃を受けて、電気短絡が発生した場合、高温高圧ガスや炎が防爆弁から噴出されると、絶縁冷却油で冷却されたり消火されたりし、衝撃力が強い場合でも、この衝撃力が逆様にした電池パックの蓋体２から噴出され、すなわち、衝撃力が自動車の下方に向かうため、乗員に影響を与えない。 When in use, the battery pack is placed upside down inside the vehicle, with the battery pack's lid 2, the cell positive electrodes 32 of the cells 31, and the bus bars 4 all positioned downward. This configuration ensures the greatest possible safety for occupants, and a battery pack with the lid 2 facing downward is advantageous for users positioned above the battery pack. The principle is as follows: When the cells 31 inside the battery pack operate and generate heat, the temperature drops through heat exchange with the insulating cooling oil. If a mechanical shock causes an electrical short circuit, high-temperature, high-pressure gas and flames are ejected from the explosion-proof valve, which cools them and extinguishes them with the insulating cooling oil. Even if the impact force is strong, the force is ejected from the lid 2 of the inverted battery pack, meaning that the force is directed downward toward the vehicle, preventing any impact on occupants.
もちろん、本電池パックは、他の分野での給電にも適用でき、したがって、電池パックが長時間使用されない場合、絶縁冷却油が循環的に流れないようにしてもよく、使用時に降温効果を果たせばよく、使用しないときに本電池パックは自然冷却する。 Of course, this battery pack can also be used to supply power in other fields. Therefore, if the battery pack is not used for an extended period of time, the insulating cooling oil does not need to be circulated; as long as it has a temperature-reducing effect when in use, the battery pack will cool naturally when not in use.
本実施例１では、図１～図３に示すように、ハウジング１の収容室１１内への絶縁冷却油の注入と排出を容易にし、絶縁冷却油の交換効率を高めるために、前記ハウジング１の両側のそれぞれには、冷油供給口１２及び冷油排出口１３が設けられ、前記冷油供給口１２及び冷油排出口１３は、前記収容室１１に連通し、収容室１１に絶縁冷却油を注入するか、又は収容室１１内から絶縁冷却油を排出するものである。いくつかの実施形態では、前記冷油供給口１２及び冷油排出口１３は、ハウジング１の蓋体２に近い箇所に設けられる。電池パックが逆様にして使用されるため、蓋体２に近いと、排液に有利である。前記冷油供給口１２及び冷油排出口１３を車体のオイルポンプ、ラジエターやヒータと組み合わせることによって、絶縁冷却油の加熱及び液冷の効果が得られる。なお、いくつかの実施形態では、冷油供給口１２及び冷油排出口１３は蓋体２に設けられてもよいが、電池パックを逆様にすることの邪魔にならないようにする。 In this Example 1, as shown in Figures 1 to 3, a cold oil supply port 12 and a cold oil discharge port 13 are provided on each side of the housing 1 to facilitate the injection and discharge of insulating cooling oil into the storage chamber 11 of the housing 1 and to increase the efficiency of insulating cooling oil exchange. The cold oil supply port 12 and the cold oil discharge port 13 are connected to the storage chamber 11 and are used to inject insulating cooling oil into the storage chamber 11 or discharge insulating cooling oil from the storage chamber 11. In some embodiments, the cold oil supply port 12 and the cold oil discharge port 13 are provided near the lid 2 of the housing 1. Because the battery pack is used upside down, being close to the lid 2 is advantageous for drainage. By combining the cold oil supply port 12 and the cold oil discharge port 13 with the vehicle's oil pump, radiator, or heater, the insulating cooling oil can be heated and liquid-cooled. In some embodiments, the cold oil supply port 12 and cold oil discharge port 13 may be provided on the lid 2, but should not interfere with turning the battery pack upside down.
より詳しくは、図６に示すように、前記セル群３のセル３１では、蓋体２に面する側のカバープレートに、セル正極３２、セル負極３３、及びセル防爆弁３４が設けられ、これらのうち、セル正極３２及びセル負極３３には、高ニッケル正極及びシリコンカーボン負極が使用され、前記セル正極３２、セル負極３３、及びセル防爆弁３４は、隣接して設けられ、及び／又は、間隔を空けて設けられる。本実施例１では、前記セル防爆弁３４は、２つ設けられ、前記セル負極３３は、２つの負極接続領域３３１を含み、前記セル正極３２は、前記セル３１の蓋体２に面する側の中央部に設けられ、２つの前記負極接続領域３３１及び２つの前記セル防爆弁３４は、前記セル正極３２に周方向に千鳥状に分布しており、前記セル負極３３と前記セル正極３２との間に高さ差が存在し、それによって、前記セル正極３２は前記セル負極３３から凸出する。したがって、前記セル負極３３及び前記セル正極３２は、隣接して設けられ、前記セル防爆弁３４とセル正極３２は、間隔を空けて設けられ、前記セル防爆弁３４は、前記圧力リリーフスペース６に向かっており、前記セル防爆弁３４は、エッジが丸くなった扇状である。 More specifically, as shown in FIG. 6, in cell 31 of the cell group 3, a cell positive electrode 32, a cell negative electrode 33, and a cell explosion-proof valve 34 are provided on the cover plate facing the lid body 2, and of these, a high-nickel positive electrode and a silicon carbon negative electrode are used for the cell positive electrode 32 and the cell negative electrode 33, and the cell positive electrode 32, the cell negative electrode 33, and the cell explosion-proof valve 34 are provided adjacent to each other and/or spaced apart. In this embodiment, two cell explosion-proof valves 34 are provided. The cell negative electrode 33 includes two negative electrode connection regions 331. The cell positive electrode 32 is provided in the center of the cell 31 on the side facing the lid 2. The two negative electrode connection regions 331 and the two cell explosion-proof valves 34 are distributed in a staggered pattern around the circumferential direction of the cell positive electrode 32. There is a height difference between the cell negative electrode 33 and the cell positive electrode 32, causing the cell positive electrode 32 to protrude from the cell negative electrode 33. Therefore, the cell negative electrode 33 and the cell positive electrode 32 are provided adjacent to each other, and the cell explosion-proof valves 34 and the cell positive electrode 32 are provided with a gap between them. The cell explosion-proof valves 34 face toward the pressure relief space 6. The cell explosion-proof valves 34 are fan-shaped with rounded edges.
図４～図６に示すように、前記バスバー４は、正極集電シート４１と、負極集電シート４２と、接続集電シート４３と、を含み、前記正極集電シート４１は、セル群３の一端にある１列の若干のセル３１のセル正極３２に接続され、前記負極集電シート４２は、セル群３の他端にある１列の若干のセル３１のセル負極３３に接続される。前記接続集電シート４３は、複数設けられ、セル群３の一端から他端までの若干列のセル３１のセル正極３２を隣接する前記セル３１の負極に連通させる。本実施例１では、防爆弁構造に合わせるために、いくつかの実施形態では、前記接続集電シート４３は、セル正極３２に接続するための正極接続部４３１と、セル負極３３に接続するための負極接続部４３２と、を含み、前記正極接続部４３１と前記負極接続部４３２との間に段差部４３３が設けられ、前記段差部４３３は、前記負極接続領域３３１の縁部に設けられ、それによって、正極接続部４３１がそれに隣接するセル３１のセル正極３２に接続するときにこのセル３１のセル負極３３に接触して短絡を引き起こすことを回避する。前記段差部４３３の段差高さ差が、前記セル正極３２とセル負極３３との間の高さ差に等しい。前記正極接続部４３１の面積が、前記セル正極３２の面積以下であり、前記負極接続部４３２の面積が、前記セル負極３３の負極接続領域３３１の面積以下であり、それによって、セル群３の電極を集める効果が得られる。 As shown in Figures 4 to 6, the busbar 4 includes a positive electrode current collector sheet 41, a negative electrode current collector sheet 42, and a connecting current collector sheet 43. The positive electrode current collector sheet 41 is connected to the cell positive electrodes 32 of a number of cells 31 in one row at one end of the cell group 3, and the negative electrode current collector sheet 42 is connected to the cell negative electrodes 33 of a number of cells 31 in one row at the other end of the cell group 3. A plurality of connecting current collector sheets 43 are provided, connecting the cell positive electrodes 32 of a number of rows of cells 31 from one end to the other end of the cell group 3 to the negative electrodes of adjacent cells 31. In this Example 1, in order to match the explosion-proof valve structure, in some embodiments, the connection current collecting sheet 43 includes a positive electrode connection portion 431 for connection to the cell positive electrode 32 and a negative electrode connection portion 432 for connection to the cell negative electrode 33, and a step portion 433 is provided between the positive electrode connection portion 431 and the negative electrode connection portion 432, and the step portion 433 is provided on the edge of the negative electrode connection region 331, thereby preventing the positive electrode connection portion 431 from contacting the cell negative electrode 33 of the adjacent cell 31 and causing a short circuit when connected to the cell positive electrode 32 of the adjacent cell 31. The step height difference of the step portion 433 is equal to the height difference between the cell positive electrode 32 and the cell negative electrode 33. The area of the positive electrode connection portion 431 is equal to or smaller than the area of the cell positive electrode 32, and the area of the negative electrode connection portion 432 is equal to or smaller than the area of the negative electrode connection region 331 of the cell negative electrode 33, thereby achieving the effect of gathering the electrodes of the cell group 3 together.
いくつかの実施形態では、前記セル防爆弁３４は、１つ又は２つ以上設けられてもよく、セル３１の圧力を正常にリリースできればよい。前記負極接続領域３３１は、１つ又は２つ以上設けられてもよく、前記バスバー４の構造は、組み立て効果を得るために、負極接続領域３３１の位置の変化、構造の変化及び数の変化に応じて調整してもよいが、本実施例では、特に限定されない。 In some embodiments, one or more cell explosion-proof valves 34 may be provided, as long as they can normally release the pressure in the cell 31. One or more negative electrode connection regions 331 may be provided, and the structure of the busbar 4 may be adjusted to accommodate changes in the position, structure, and number of the negative electrode connection regions 331 to achieve assembly effects, but this embodiment is not particularly limited thereto.
以上の通り、本願による電池パックは、以下の技術的効果を有する。
１．セル群３の少なくとも一方の側とハウジング１との間に固定層５が設けられることによって、収容室１１内でのセル群３の安定性が向上する。固定層５ではセル群３に対応して設けられたセル溝５１により、セル３１がすべてそれに対応する位置に正確に配置され、組み立てや使用中のセル３１の変位やズレが回避される。
２．絶縁冷却油の存在により、放熱効果が高まり、また、バスバー４が電池の熱暴走により溶断するリスクも低減し、電池パックの安全性が大幅に向上する。さらに、セル防爆弁３４の配置や圧力リリーフスペース６の構成によれば、セル３１に熱暴走が発生した場合に、内部の圧力を効果的に分散させて低下させ、セル３１の安全性を向上させることができる。
As described above, the battery pack according to the present invention has the following technical effects.
1. The provision of the fixing layer 5 between at least one side of the cell group 3 and the housing 1 improves the stability of the cell group 3 within the storage chamber 11. The fixing layer 5 has cell grooves 51 provided corresponding to the cell group 3, which allow all of the cells 31 to be accurately positioned in their corresponding positions, preventing displacement or misalignment of the cells 31 during assembly or use.
2. The presence of insulating cooling oil enhances heat dissipation and reduces the risk of the busbars 4 melting due to thermal runaway of the battery, significantly improving the safety of the battery pack. Furthermore, the placement of the cell explosion-proof valves 34 and the configuration of the pressure relief spaces 6 effectively disperse and reduce the internal pressure in the event of thermal runaway in the cells 31, improving the safety of the cells 31.
１ ハウジング
１１ 収容室
１２ 冷油供給口
１３ 冷油排出口
２ 蓋体
３ セル群
３１ セル
３２ セル正極
３３ セル負極
３３１ 負極接続領域
３４ セル防爆弁
４ バスバー
４１ 正極集電シート
４２ 負極集電シート
４３ 接続集電シート
４３１ 正極接続部
４３２ 負極接続部
４３３ 段差部
５ 固定層
５１ セル溝
６ 圧力リリーフスペース
REFERENCE SIGNS LIST 1 Housing 11 Storage chamber 12 Cold oil supply port 13 Cold oil discharge port 2 Lid 3 Cell group 31 Cell 32 Cell positive electrode 33 Cell negative electrode 331 Negative electrode connection area 34 Cell explosion-proof valve 4 Bus bar 41 Positive electrode current collecting sheet 42 Negative electrode current collecting sheet 43 Connection current collecting sheet 431 Positive electrode connection portion 432 Negative electrode connection portion 433 Step portion 5 Fixing layer 51 Cell groove 6 Pressure relief space
Claims (8)
一方の側が開放した収容室（１１）を有するハウジング（１）と、
前記ハウジング（１）の開放側に覆設され、前記収容室（１１）を密閉させる蓋体（２）と、
前記収容室（１１）内に設けられ、その電極が前記蓋体に面するセル群（３）と、
前記セル群（３）と前記蓋体（２）との間に設けられ、前記蓋体（２）との間に圧力リリーフスペース（６）が予め残っているバスバー（４）と、を含み、
前記収容室（１１）内に絶縁冷却油が注入されており、前記セル群（３）の電極及び前記バスバー（４）は、前記絶縁冷却油中に浸漬されており、
前記セル群（３）は、複数のセル（３１）を含み、前記複数のセル（３１）の各々の蓋体（２）に面する側のカバープレートにセル正極（３２）、セル負極（３３）、及び少なくとも２つのセル防爆弁（３４）が設けられ、前記セル負極（３３）は、少なくとも２つのセル負極接続領域（３３１）を含み、前記セル正極（３２）と、前記少なくとも２つのセル負極接続領域（３３１）の各々との間に高さ差が存在し、前記少なくとも２つのセル防爆弁（３４）は、前記圧力リリーフスペース（６）に面し、前記少なくとも２つのセル負極接続領域（３３１）及び前記少なくとも２つのセル防爆弁（３４）は、前記セル正極（３２）に周方向に千鳥状に分布している、電池パック。 A battery pack,
a housing (1) having a storage chamber (11) open on one side;
a cover (2) that covers the open side of the housing (1) and seals the storage chamber (11);
a cell group (3) provided in the storage chamber (11), with its electrodes facing the lid;
a bus bar (4) provided between the cell group (3) and the cover (2), with a pressure relief space (6) remaining between the bus bar (4) and the cover (2);
Insulating and cooling oil is poured into the accommodation chamber (11), and the electrodes of the cell group (3) and the bus bars (4) are immersed in the insulating and cooling oil,
The battery pack includes a battery pack in which the cell group (3) includes a plurality of cells (31), and a cover plate of each of the plurality of cells (31) on a side facing the lid (2) is provided with a cell positive electrode (32), a cell negative electrode (33), and at least two cell explosion-proof valves (34), the cell negative electrode (33) includes at least two cell negative electrode connection regions (331), there is a height difference between the cell positive electrode (32) and each of the at least two cell negative electrode connection regions (331), the at least two cell explosion-proof valves (34) face the pressure relief space (6), and the at least two cell negative electrode connection regions (331) and the at least two cell explosion-proof valves (34) are distributed in a staggered pattern in the circumferential direction of the cell positive electrode (32) .
前記セル群（３）の一端にある複数のセル（３１）のセル正極（３２）に接続される正極集電シート（４１）と、
前記セル群（３）の他端にある複数のセル（３１）のセル負極（３３）に接続される負極集電シート（４２）と、
前記セル群（３）の一端から他端までの複数のセル（３１）の前記セル正極（３２）を前記セル負極（３３）に連通させるための、複数設けられる接続集電シート（４３）と、を含む、請求項１に記載の電池パック。 The bus bar (4) is
a positive electrode current collector sheet (41) connected to the cell positive electrodes (32) of the plurality of cells (31) at one end of the cell group (3);
a negative electrode current collector sheet (42) connected to the cell negative electrodes (33) of the plurality of cells (31) at the other end of the cell group (3);
a plurality of connection current collecting sheets (43) for connecting the cell positive electrodes (32) of the plurality of cells (31) from one end to the other end of the cell group (3) to the cell negative electrodes (33).
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| PCT/CN2024/114809 WO2025200272A1 (en) | 2024-03-29 | 2024-08-27 | Battery pack |
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| DE102021105861A1 (en) * | 2021-03-10 | 2022-09-15 | e-Technologies GmbH | DIRECT-COOLED BATTERY MODULE AND BATTERY WITH DIRECT-COOLED BATTERY MODULE |
-
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- 2024-11-11 JP JP2024196518A patent/JP7802893B2/en active Active
- 2024-11-11 US US18/942,783 patent/US20250309406A1/en active Pending
- 2024-11-12 KR KR1020240160057A patent/KR20240168254A/en active Pending
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| JP2012138239A (en) | 2010-12-27 | 2012-07-19 | Panasonic Corp | Battery module |
| JP2021089811A (en) | 2019-12-02 | 2021-06-10 | 株式会社デンソー | Battery pack |
| JP2021177472A (en) | 2020-05-08 | 2021-11-11 | 株式会社デンソー | Battery monitoring device |
| JP2023511181A (en) | 2020-06-17 | 2023-03-16 | エルジー エナジー ソリューション リミテッド | BATTERY MODULE, BATTERY PACK AND MOTOR VEHICLE CONTAINING THE SAME, AND METHOD FOR MANUFACTURING BATTERY PACK |
| JP2022136733A (en) | 2021-03-08 | 2022-09-21 | 三洋電機株式会社 | Battery module and battery module manufacturing method |
| JP2024508072A (en) | 2022-01-25 | 2024-02-22 | 湖北億緯動力有限公司 | Busbar assembly and cylindrical power battery module |
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| Publication number | Publication date |
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| EP4625616A1 (en) | 2025-10-01 |
| EP4625616B1 (en) | 2026-04-01 |
| JP2025155708A (en) | 2025-10-14 |
| US20250309406A1 (en) | 2025-10-02 |
| KR20240168254A (en) | 2024-11-29 |
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