JP6966058B2 - バッテリーモジュール - Google Patents
バッテリーモジュール Download PDFInfo
- Publication number
- JP6966058B2 JP6966058B2 JP2019229286A JP2019229286A JP6966058B2 JP 6966058 B2 JP6966058 B2 JP 6966058B2 JP 2019229286 A JP2019229286 A JP 2019229286A JP 2019229286 A JP2019229286 A JP 2019229286A JP 6966058 B2 JP6966058 B2 JP 6966058B2
- Authority
- JP
- Japan
- Prior art keywords
- resin layer
- resin
- lower plate
- battery module
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
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- 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
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- 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
- H01M50/24—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 from their environment, e.g. from corrosion
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- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
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Description
樹脂層の熱伝導度はASTM D5470規格により測定した。すなわち、ASTM D 5470の規格により2つの銅棒(copper bar)の間に樹脂層を位置させた後、前記2個の銅棒の中の一つはヒーターと接触させ、他の一つはクーラー(cooler)と接触させた後、前記ヒーターが一定温度を維持するようにし、クーラーの容量を調節して熱平衡状態(5分に約0.1℃以下の温度変化を見せる状態)を作った。熱平衡状態で各銅棒の温度を測定し、下記の数式によって熱伝導度(K、単位:W/mK)を評価した。熱伝導度評価時に樹脂層にかかる圧力は約11Kg/25cm2程度となるように調節し、測定過程で樹脂層の厚さが変化した場合に最終厚さを基準として熱伝導度を計算した。
K=(Q×dx)/(A×dT)
樹脂層の比重はASTM D792規格により測定した。例えば、前記規格により樹脂層の重さを測った後で水の中で再び重さを測った後、前記測定された重さの差を通じて密度と比重を計算するか、粉末やペレット(pellet)所定量(ex.約5g)を高温計の中のすでに測定された容積に入れ、73.4F°で重さと容積の差を通じて比重を計算することができる。
TA Instrument社のTA400機器を用いて熱重量分析を遂行した。樹脂層約10mgを使用して分析を遂行し、分析は25℃〜800℃の温度範囲、加熱速度20℃/分および60cm3/分の質素(N2)雰囲気下で分析を遂行した。
樹脂層の絶縁破壊電圧はASTM D149規格により評価した。絶縁破壊電圧は物質が絶縁性を失う瞬間まで加えられる電圧を意味し、一定水準以上の高電圧で導電性が急速に増加して絶縁性を失うことになる。絶縁破壊を起こすのに必要な最小の電圧を破壊電圧といい、絶縁性は試片を通じてアークが完全に通じて発生される。電圧の変化率(voltage gradient)は破壊される瞬間の電圧を絶縁厚さで分けて得ることができる。Backman Industrial PA70−1005/202機器を利用して絶縁破壊電圧を測定し、このとき、試片(樹脂層)の厚さは約2mm程度とし、直径が約100mm程度となるようにした。
絶縁膜(エポキシおよび/またはポリエーテル系絶縁層)が形成されているアルミニウム製モジュールケースの下部板とPET(poly(ethylene terephthalate))フィルムを、樹脂層を使用して付着し、このとき、付着される幅は約10mm程度となるようにした。このとき、樹脂層の厚さは約1mm程度にした。前記付着は未硬化された樹脂組成物を前記絶縁膜とPETフィルムの間にローディング(loading)した後、これを硬化させて遂行する。その後、約300mm/minの速度および180度の剥離角度で前記PETフィルムを絶縁側から剥離して接着力を測定する。
樹脂層の硬度は、ASTM D 2240、JIS K 6253規格により測定した。ASKER、durometer hardness機器を用いて遂行し、平らな状態のサンプル(樹脂層)の表面に1Kg以上の荷重(約1.5Kg)を加えて初期硬度を測定し、15秒後に安定化された測定値で確認して硬度を評価した。
バッテリーモジュールの信頼性はモジュールの熱抵抗および耐電圧強度を測定して評価した。耐電圧強度は、バッテリーモジュールがどれほどの電圧の印加まで破損されずに耐えるかを調べる試験である。下記の実施例および比較例では、約1.2kVから始まって、加えられる電圧の大きさを大きくしながら耐電圧強度を測定した。バッテリーモジュールの熱抵抗は、測定機器の上部および下部ブロックの間にモジュールを位置させて、コンピュータ(controlling computer)のDynTIM Tester softwareを実行し、Software上でヒーティング(heating)電流および測定時間などを決定して入力し、測定圧力、熱抵抗測定条件などのパラメーターのsettingを完了して、softwareで制御されるT3SterとDynTIM testerが測定条件別に熱抵抗値を測定するようにして熱抵抗を評価した。各評価結果による信頼性は下記の基準で分類した。
上:耐電圧強度が2kV以上の場合
中:耐電圧強度が2kV未満〜0.5kV以上
下:耐電圧強度が0.5kV未満
上:熱抵抗が2K/W以下である場合
中:熱抵抗が2K/W超過〜6K/W以下である場合
下:熱抵抗が6K/W超過である場合
2液型ウレタン系接着剤組成物(主剤:HP−3753(KPXケミカル)、硬化剤:TLA−100(旭化成))にアルミナ(粒度分布:1μm〜60μm)を前記2液型ウレタン系接着剤組成物が硬化後に約3W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約600〜900重量部の範囲内)で混合して、常温粘度が約250,000cP程度である樹脂組成物を製造し、これを下記バッテリーモジュールの製造に適用した。
図1のような形状のモジュールケースとして、アルミニウムで製造された下部板、側壁および上部板を有するモジュールケースを用いた。前記モジュールケースの下部板の内側面にはバッテリーセルの装着をガイドするガイド部が形成されており、前記モジュールケースの下部板の中心部には樹脂組成物の注入のための注入ホールが一定間隔で形成されており、下部板の末端には観察ホールが形成されている。前記モジュールケース内にバッテリーパウチを複数個積層したパウチの束を収納した。引き続き、前記モジュールケースの表面に上部板を覆った。その後、前記注入ホールに前記製造された樹脂組成物を、注入される組成物が観察ホールまで到達することが確認されるまで注入した後、硬化させてバッテリーモジュールを製造した。
2液型シリコン系接着剤組成物(主剤:SL5100A(KCC剤)、硬化剤:SL5100B(KCC剤))にアルミナ(粒度分布:1μm〜60μm)を前記2液型シリコン系接着剤組成物が硬化後に約3W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約800〜1200重量部の範囲内)で混合し、常温粘度が約130,000cP程度である樹脂組成物を製造し、これを下記バッテリーモジュールの製造に適用した。
実施例1で使用したものと同じ構造を有し、ただし樹脂組成物の注入のための注入ホールと観察ホールが形成されていないケースを用いた。該当ケースの下部板内側面の前面に前記製造された樹脂組成物を約500μm程度の厚さにコーティングし、実施例1と同じバッテリーセルを収納して、上部板を覆った後、樹脂組成物の層を硬化させてバッテリーモジュールを製造した。
2液型ウレタン系接着剤組成物(主剤:PP−2000(KPXケミカル)、硬化剤:TLA−100(旭化成))にアルミナ(粒度分布:1μm〜60μm)を前記2液型ウレタン系接着剤組成物が硬化後に約3.5W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約600〜900重量部の範囲内)で混合し、常温粘度が約350,000cP程度となるように製造した樹脂組成物を用いたことを除いては実施例1と同一にバッテリーモジュールを製造した。
国道化学で入手した常温硬化型のエポキシ系接着剤組成物にアルミナ(粒度分布:1μm〜60μm)を前記接着剤組成物が硬化後に約3W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約600〜900重量部の範囲内)で混合し、常温粘度が約500,000cP程度となるように製造した樹脂組成物を用いたことを除いては実施例1と同一にバッテリーモジュールを製造した。
2液型シリコン系接着剤組成物(主剤:SL5100A(KCC剤)、硬化剤:SL5100B(KCC剤))にグラファイト(graphite)を前記2液型シリコン系接着剤組成物が硬化後に約1.5W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約100〜300重量部の範囲内)で混合し、常温粘度が約2,000,000cP程度となるように製造した樹脂組成物を用いたことを除いては実施例2と同一にバッテリーモジュールを製造した。
2液型シリコン系接着剤組成物(主剤:SL5100A(KCC剤)、硬化剤:SL5100B(KCC剤))にアルミナ(粒度分布:1μm〜60μm)を前記接着剤組成物が硬化後に約1.5W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約300〜500重量部の範囲内)で混合し、常温粘度が約100,000cP程度となるように製造した樹脂組成物を用いたことを除いては実施例2と同一にバッテリーモジュールを製造した。
2液型ウレタン系接着剤組成物(主剤:PP−2000(KPXケミカル)、硬化剤:TLA−100(旭化成))にアルミナ(粒度分布:1μm〜60μm)を前記2液型ウレタン系接着剤組成物が硬化後に約2W/mkの熱伝導度を示すことができる量(2液合計固形分100重量部対比約400〜900重量部の範囲内)で混合し、常温粘度が約150,000cP程度となるように製造した樹脂組成物を用いたことを除いては実施例1と同一にバッテリーモジュールを製造した。
接着剤組成物を使用せずに、すなわち樹脂層を形成しないことを除いては、実施例2と同一にバッテリーモジュールを製造した。
10:モジュールケース
10a:下部板
10b:側壁
10c:上部板
10d:ガイド部
20:バッテリーセル
30:樹脂層
50a:注入ホール
50b:観察ホール
40:絶縁層
100:パウチ型セル
110:電極組立体
120:外装材
121:上部パブチ
122:下部パウチ
S:シーリング部
Claims (18)
- 内部空間を形成する下部板と上部板と側壁を有するモジュールケース;
前記モジュールケースの内部空間に存在する複数のバッテリーセル;および
前記モジュールケースの内部空間に存在する樹脂層を含み、
前記樹脂層は、前記複数のバッテリーセルと接触していながら、また、前記モジュールケースの下部板と接触しており、
前記樹脂層は、前記上部板とは、接触しておらず、
前記下部板は、熱伝導度が10W/mk以上である熱伝導性下部板であり、
前記樹脂層は、前記下部板と前記下部板の全体面積対比70%以上の接触面積を形成するように前記下部板と接触しており、
前記樹脂層は、樹脂成分と前記樹脂成分100重量部対比200重量部以上の熱伝導性セラミックフィラーを含む接着剤層であり、
前記フィラーは、アルミナ、AlN、BN、窒化ケイ素、ZnO、SiC、及びBeOから選択される少なくとも1種以上であり、
前記接着剤層は、熱伝導度が2W/mk以上であり、絶縁破壊電圧が7kV/mm以上であり、接着力が1000gf/10mm以下であり、熱重量分析(TGA)で800℃残量が70重量%以上である、バッテリーモジュール(但し、前記樹脂層が、前記側壁と平行な方向において前記バッテリーセルを半分以上を覆うように充填されている場合を除く)。 - 前記樹脂層と接触している下部板または側壁には樹脂組成物注入ホールが形成されている、請求項1に記載のバッテリーモジュール。
- 前記注入ホールが形成されている側壁または下部板には樹脂組成物注入を観察するための観察ホールが形成されている、請求項2に記載のバッテリーモジュール。
- 前記熱伝導性下部板は、金属素材からなる、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、前記下部板と前記下部板の全体面積対比75%以上の接触面積を形成するように前記下部板と接触している、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は熱伝導度が、2.5W/mk以上である、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は絶縁破壊電圧が10kV/mm以上である、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、接着力が950gf/10mm以下である、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、比重が5以下である、請求項1に記載のバッテリーモジュール。
- 前記樹脂層はショアA硬度が100未満であるか、ショアD硬度が70以下である、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、熱重量分析(TGA)で800℃残量が80重量%以上である、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、前記樹脂成分として、アクリル樹脂、エポキシ樹脂、ウレタン樹脂、オレフィン樹脂、EVA樹脂またはシリコン樹脂を含む、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、揺変性付与剤、希釈剤、分散剤、表面処理剤、難燃剤またはカップリング剤を含む、請求項1に記載のバッテリーモジュール。
- 前記樹脂層は、厚さが100μm〜5mmの範囲内である、請求項1に記載のバッテリーモジュール。
- 内部空間を形成する下部板と側壁を有するモジュールケース内に樹脂組成物を注入する段階;前記モジュールケース内にバッテリーセルを収納する段階および前記樹脂組成物を硬化させて樹脂層を形成する段階を含む、請求項1に記載のバッテリーモジュールの製造方法。
- 前記下部板または側壁には樹脂組成物注入ホールが形成されており、樹脂組成物は、バッテリーセルを収納した後で前記注入ホールに注入する、請求項15に記載のバッテリーモジュールの製造方法。
- 互いに電気的に連結されている、請求項1に記載されたバッテリーモジュールを二つ以上含む、バッテリーパック。
- 請求項1に記載されたバッテリーモジュールまたは請求項17に記載されたバッテリーパックを含む、自動車。
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