JP2017041317A - Battery pack - Google Patents

Battery pack Download PDF

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JP2017041317A
JP2017041317A JP2015160961A JP2015160961A JP2017041317A JP 2017041317 A JP2017041317 A JP 2017041317A JP 2015160961 A JP2015160961 A JP 2015160961A JP 2015160961 A JP2015160961 A JP 2015160961A JP 2017041317 A JP2017041317 A JP 2017041317A
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housing
battery cell
bottom portion
battery
battery pack
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JP6464958B2 (en
Inventor
拓 井上
Hiroshi Inoue
拓 井上
加藤　崇行
Takayuki Kato
崇行 加藤
浩生 植田
Hiromi Ueda
浩生 植田
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Toyota Industries Corp
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Toyota Industries Corp
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Priority to PCT/JP2016/067559 priority patent/WO2017029865A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • 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
    • 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
    • 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
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • 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
    • 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
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • 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
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • 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
    • H01M10/6554—Rods or plates
    • 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)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack which inhibits variations in heat dissipation of battery cells from occurring between housing parts.SOLUTION: In a battery pack 1A, first battery cells 3a and second battery cells 3b are housed in a housing 4. The housing 4 includes: a first housing part 10 having a first bottom part 11 and housing the first battery cells 3a; and a second housing part 20 having a second bottom part 21 and housing the second battery cells 3b. The second housing part 20 is stacked on the first housing part 10. The first bottom part 11 is disposed at an opposite side of the second housing part 20, and the second bottom part 21 is disposed on a first housing part 10 side. Heat capacity of the second bottom part 21 is larger than heat capacity of the first bottom part 11.SELECTED DRAWING: Figure 2

Description

本発明は、電池パックに関する。   The present invention relates to a battery pack.

特許文献１には、複数個の単電池を筐体内に収納する集合電池が記載されている。この集合電池の筐体は、電池ケースを複数段に積み重ねた構造を有し、各電池ケースのそれぞれに複数個の単電池が収容されている。   Patent Document 1 describes an assembled battery that houses a plurality of unit cells in a casing. The housing of the assembled battery has a structure in which battery cases are stacked in a plurality of stages, and a plurality of single cells are accommodated in each of the battery cases.

特開平１−１３４８５１号公報Japanese Patent Laid-Open No. 1-134851

電池セルは、使用により、充電及び放電を繰り返す。電池セルは、特に充電時に発熱する。電池セルは、高温により劣化するので、電池セルの劣化を抑えるには、電池セルの放熱性を高める必要がある。電池セルから放出された熱は、筐体を介して筐体の外部及び内部に放出される。上述のように、複数のケースを積み重ねた構造を有する筐体には、筐体の外部に露出する面を有する壁部と、略全体が筐体の内部に位置する壁部とが存在している。   A battery cell repeats charge and discharge by use. Battery cells generate heat particularly during charging. Since battery cells deteriorate due to high temperatures, it is necessary to improve the heat dissipation of the battery cells in order to suppress the deterioration of the battery cells. The heat released from the battery cell is released to the outside and inside of the casing through the casing. As described above, a housing having a structure in which a plurality of cases are stacked includes a wall portion having a surface exposed to the outside of the housing, and a wall portion that is located almost entirely inside the housing. Yes.

電池セルの使用時は、通常、筐体の内部の温度よりも、筐体の外部の温度の方が低くなる。また、熱は、温度差が大きいほど伝わり易い。したがって、略全体が筐体内に位置する壁部の放熱性は、外部に露出する面を有する壁部の放熱性よりも低くなる。この違いに起因して、複数のケース間で電池セルの放熱性にばらつきが生じる場合がある。これに伴い、電池セル間に温度差が生じ、電池セル間で劣化の程度にばらつきが生じるおそれがある。電池パックの寿命は、最も劣化の大きい電池セルに左右される。このため、一部の電池セルで劣化が進むと、電池パックの寿命が短くなるおそれがある。   When the battery cell is used, the temperature outside the casing is usually lower than the temperature inside the casing. Moreover, heat is more easily transmitted as the temperature difference is larger. Therefore, the heat dissipation of the wall portion, which is located almost entirely within the housing, is lower than the heat dissipation of the wall portion having the surface exposed to the outside. Due to this difference, the heat dissipation of the battery cell may vary among a plurality of cases. Along with this, a temperature difference occurs between the battery cells, and the degree of deterioration may vary among the battery cells. The life of the battery pack depends on the battery cell with the greatest deterioration. For this reason, if the deterioration of some battery cells proceeds, the life of the battery pack may be shortened.

本発明は、複数の収容部間で電池セルの放熱性にばらつきが生じることを抑制可能な電池パックを提供する。   The present invention provides a battery pack capable of suppressing variations in heat dissipation of battery cells between a plurality of accommodating portions.

本発明の一態様に係る電池パックは、第１電池セル及び第２電池セルを筐体内に収容する電池パックであって、筐体は、第１底部を有し、第１電池セルを収容する第１収容部と、第２底部を有し、第２電池セルを収容する第２収容部と、を備え、第２収容部は、第１収容部上に積み重ねられ、第１底部は、第２収容部と反対側に配置され、第２底部は、第１収容部側に配置され、第２底部の熱容量は、第１底部の熱容量よりも大きい。   A battery pack according to an aspect of the present invention is a battery pack that houses a first battery cell and a second battery cell in a housing, and the housing has a first bottom and houses the first battery cell. A first housing portion, a second housing portion having a second bottom portion and housing a second battery cell, wherein the second housing portion is stacked on the first housing portion, and the first bottom portion is The second bottom portion is disposed on the first housing portion side, and the heat capacity of the second bottom portion is larger than the heat capacity of the first bottom portion.

この電池パックでは、第１電池セルの熱は、第１収容部を介して、筐体の外部又は内部に放出される。また、第２電池セルの熱は、第２収容部を介して、筐体の外部又は内部に放出される。第１収容部の第１底部は、筐体の外部に露出する面を有している。また、第２収容部の第２底部は、略全体が筐体の内部に位置している。このため、第２底部の放熱性は、第１底部の放熱性よりも低くなっている。したがって、放熱性の点では、第２底部の温度は、第１底部の温度よりも高くなり易い。仮に、第２底部の温度が第１底部の温度よりも高くなると、第２電池セルの第２底部に対する放熱性が、第１電池セルの第１底部に対する放熱性よりも低くなる。そこで、第２底部の熱容量は、第１底部の熱容量よりも大きく設定されている。熱容量が大きいと、温度が上昇し難くなる。したがって、第２底部の温度が第１底部の温度よりも高くなることを抑制できる。すなわち、第１底部及び第２底部の熱容量は、第１電池セルの放熱性に対する第１底部の影響と、第２電池セルの放熱性に対する第２底部の影響との間のばらつきを抑制するように設定されている。この結果、第１電池セルと第２電池セルとの間で、放熱性にばらつきが生じることを抑制可能となる。   In this battery pack, the heat of the first battery cell is released to the outside or the inside of the housing through the first housing portion. Further, the heat of the second battery cell is released to the outside or the inside of the housing through the second housing portion. The first bottom part of the first housing part has a surface exposed to the outside of the housing. In addition, the second bottom portion of the second housing portion is substantially entirely located inside the housing. For this reason, the heat dissipation of the second bottom is lower than the heat dissipation of the first bottom. Therefore, in terms of heat dissipation, the temperature of the second bottom tends to be higher than the temperature of the first bottom. If the temperature of the second bottom portion is higher than the temperature of the first bottom portion, the heat dissipation property of the second battery cell with respect to the second bottom portion is lower than the heat dissipation property of the first battery cell with respect to the first bottom portion. Therefore, the heat capacity of the second bottom portion is set larger than the heat capacity of the first bottom portion. When the heat capacity is large, the temperature is difficult to rise. Therefore, it can suppress that the temperature of a 2nd bottom part becomes higher than the temperature of a 1st bottom part. That is, the heat capacities of the first bottom portion and the second bottom portion suppress variation between the influence of the first bottom portion on the heat dissipation performance of the first battery cell and the influence of the second bottom portion on the heat dissipation performance of the second battery cell. Is set to As a result, it is possible to suppress variation in heat dissipation between the first battery cell and the second battery cell.

第２底部の厚さは、第１底部の厚さよりも厚くてもよい。第１底部の熱容量は、第１底部の厚さに比例し、第２底部の熱容量は、第２底部の厚さに比例する。したがって、この場合、第２底部の熱容量を第１底部の熱容量よりも大きくすることができる。   The thickness of the second bottom portion may be thicker than the thickness of the first bottom portion. The heat capacity of the first bottom is proportional to the thickness of the first bottom, and the heat capacity of the second bottom is proportional to the thickness of the second bottom. Therefore, in this case, the heat capacity of the second bottom can be made larger than the heat capacity of the first bottom.

本発明の一態様に係る電池パックは、第１電池セル及び第２電池セルを筐体内に収容する電池パックであって、筐体は、第１底部を有し、第１電池セルを収容する第１収容部と、第２底部を有し、第２電池セルを収容する第２収容部と、を備え、第２収容部は、第１収容部上に積み重ねられ、第１底部は、第２収容部と反対側に配置され、第２底部は、第１収容部側に配置され、第２底部の熱伝導率は、第１底部の熱伝導率よりも高い。   A battery pack according to an aspect of the present invention is a battery pack that houses a first battery cell and a second battery cell in a housing, and the housing has a first bottom and houses the first battery cell. A first housing portion, a second housing portion having a second bottom portion and housing a second battery cell, wherein the second housing portion is stacked on the first housing portion, and the first bottom portion is The second bottom portion is disposed on the first housing portion side, and the thermal conductivity of the second bottom portion is higher than the thermal conductivity of the first bottom portion.

この電池パックでは、第１電池セルの熱は、第１収容部を介して、筐体の外部又は内部に放出される。また、第２電池セルの熱は、第２収容部を介して、筐体の外部又は内部に放出される。第１収容部の第１底部は、筐体の外部に露出する面を有している。また、第２収容部の第２底部は、略全体が筐体の内部に位置している。このため、第２底部の放熱性は、第１底部の放熱性よりも低くなっている。したがって、放熱性の点では、第２底部の温度は、第１底部の温度よりも高くなり易い。仮に、第２底部の温度が第１底部の温度よりも高くなると、第２電池セルの第２底部に対する放熱性が、第１電池セルの第１底部に対する放熱性よりも低くなる。そこで、第２底部の熱伝導率は、第１底部の熱伝導率よりも高く設定されている。熱は、熱伝導率が大きいほど伝わり易いため、第２電池セルの熱が第２底部を介して第１収容部に放出され易くなる。すなわち、第１底部及び第２底部の熱伝導率は、第１電池セルの放熱性に対する第１底部の影響と、第２電池セルの放熱性に対する第２底部の影響との間のばらつきを抑制するように設定されている。この結果、第１電池セルと第２電池セルとの間で、放熱性にばらつきが生じることを抑制可能となる。   In this battery pack, the heat of the first battery cell is released to the outside or the inside of the housing through the first housing portion. Further, the heat of the second battery cell is released to the outside or the inside of the housing through the second housing portion. The first bottom part of the first housing part has a surface exposed to the outside of the housing. In addition, the second bottom portion of the second housing portion is substantially entirely located inside the housing. For this reason, the heat dissipation of the second bottom is lower than the heat dissipation of the first bottom. Therefore, in terms of heat dissipation, the temperature of the second bottom tends to be higher than the temperature of the first bottom. If the temperature of the second bottom portion is higher than the temperature of the first bottom portion, the heat dissipation property of the second battery cell with respect to the second bottom portion is lower than the heat dissipation property of the first battery cell with respect to the first bottom portion. Therefore, the thermal conductivity of the second bottom is set higher than the thermal conductivity of the first bottom. Since heat is more easily transmitted as the thermal conductivity is higher, the heat of the second battery cell is easily released to the first housing portion through the second bottom portion. That is, the thermal conductivity of the first bottom portion and the second bottom portion suppresses variation between the influence of the first bottom portion on the heat dissipation of the first battery cell and the influence of the second bottom portion on the heat dissipation of the second battery cell. It is set to be. As a result, it is possible to suppress variation in heat dissipation between the first battery cell and the second battery cell.

第１収容部において、第１電池セルは、第１底部に取り付けられており、第２収容部において、第２電池セルは、第２底部に取り付けられていてもよい。上述のとおり、第１電池セルの放熱性に対する第１底部の影響と、第２電池セルの放熱性に対する第２底部の影響との間のばらつきが抑制されている。この結果、第１電池セルと第２電池セルとの間で、放熱性にばらつきが生じることを更に抑制可能となる。   In the first housing part, the first battery cell may be attached to the first bottom part, and in the second housing part, the second battery cell may be attached to the second bottom part. As described above, the variation between the influence of the first bottom part on the heat dissipation of the first battery cell and the influence of the second bottom part on the heat dissipation of the second battery cell is suppressed. As a result, it is possible to further suppress variation in heat dissipation between the first battery cell and the second battery cell.

第１収容部の第１底部に対向する面が第１開口をなし、第２収容部は、第２底部により、第１開口を塞ぐように第１収容部上に積み重ねられていてもよい。この場合、第１収容部が第１底部に対向する蓋部を有していないので、第１収容部の構成を簡単にすることができる。   The surface facing the first bottom portion of the first housing portion may form a first opening, and the second housing portion may be stacked on the first housing portion so as to close the first opening by the second bottom portion. In this case, since the 1st accommodating part does not have the cover part which opposes a 1st bottom part, the structure of a 1st accommodating part can be simplified.

第２底部の第１収容部側に位置する面には、複数の凹部が設けられていてもよい。この場合、第２底部の第１収容部側に位置する面の表面積が増し、第２底部から第１収容部に熱が放出され易くなる。これにより、第２底部の温度の上昇が更に抑えられるので、第２底部に対する第２電池セルの放熱性を更に高めることができる。この結果、第１電池セルと第２電池セルとの間で、放熱性にばらつきが生じることを更に抑制可能となる。   A plurality of recesses may be provided on the surface of the second bottom portion located on the first housing portion side. In this case, the surface area of the surface located on the first housing portion side of the second bottom portion is increased, and heat is easily released from the second bottom portion to the first housing portion. Thereby, since the raise of the temperature of a 2nd bottom part is further suppressed, the heat dissipation of the 2nd battery cell with respect to a 2nd bottom part can further be improved. As a result, it is possible to further suppress variation in heat dissipation between the first battery cell and the second battery cell.

第１収容部と第２収容部とは、別体として構成されており、第２底部は、第１収容部側に位置する面に、第１開口に嵌合する凸部を有していてもよい。この場合、第１収容部と第２収容部との間の位置決めを容易に行うことができる。   The 1st accommodating part and the 2nd accommodating part are comprised as a different body, and the 2nd bottom part has the convex part fitted to the 1st opening in the field located in the 1st accommodating part side. Also good. In this case, positioning between the 1st accommodating part and the 2nd accommodating part can be performed easily.

本発明によれば、複数の収容部間で電池セルの放熱性にばらつきが生じることを抑制可能となる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress that dispersion | variation arises in the heat dissipation of a battery cell between several accommodating parts.

第１実施形態に係る電池パックの一部を破断して示す斜視図である。It is a perspective view which fractures | ruptures and shows a part of battery pack which concerns on 1st Embodiment. 図１のII−II線に沿っての断面図である。It is sectional drawing along the II-II line of FIG. 第２実施形態に係る電池パックの断面図である。It is sectional drawing of the battery pack which concerns on 2nd Embodiment. 第３実施形態に係る電池パックの断面図である。It is sectional drawing of the battery pack which concerns on 3rd Embodiment. 第４実施形態に係る電池パックの断面図である。It is sectional drawing of the battery pack which concerns on 4th Embodiment.

以下、添付図面を参照しながら本発明の実施形態が詳細に説明される。図面の説明において、同一又は同等の要素には同一符号が用いられ、重複する説明は省略される。図面の寸法比率は、説明のものと必ずしも一致していない。また、説明中、「上」、「下」、「前」、「後」等の方向を示す語は、図面に示された状態に基づいた便宜的な語である。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted. The dimensional ratios in the drawings do not necessarily match those described. Further, in the description, words indicating directions such as “up”, “down”, “front”, “rear”, and the like are convenience words based on the state shown in the drawings.

（第１実施形態）
図１及び図２を参照して、第１実施形態について説明する。図１は、第１実施形態に係る電池パックの一部を破断して示す斜視図である。図２は、図１のII−II線に沿っての断面図である。図１及び図２に示されるように、電池パック１Ａは、第１電池モジュール２ａと、第２電池モジュール２ｂと、を筐体４内に収容している。電池パック１Ａは、例えばフォークリフト等の車両のバッテリーとして用いられる装置であり、車両に設けられた所定の大きさのバッテリー収容部に収容されている。 (First embodiment)
The first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a part of the battery pack according to the first embodiment in a broken state. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. As shown in FIGS. 1 and 2, the battery pack 1 </ b> A houses a first battery module 2 a and a second battery module 2 b in a housing 4. The battery pack 1A is a device used as a battery of a vehicle such as a forklift, and is housed in a battery housing portion of a predetermined size provided in the vehicle.

第１電池モジュール２ａは、複数の第１電池セル３ａを有している。第１電池セル３ａは、リチウムイオン二次電池等の非水電解質二次電池といった蓄電池、または電気二重層キャパシタ等である。複数の第１電池セル３ａは、互いに電気的に接続されて、Ｘ方向に配列されている。複数の第１電池セル３ａは、このように配列された状態において、例えば、Ｘ方向の両側に配置された一対のエンドプレート（不図示）により互いに固定され、一体化されている。第１電池モジュール２ａの配列方向の両端（すなわち、エンドプレート）には、第１電池モジュール２ａを筐体４に固定して取り付けるためのブラケット（不図示）が取り付けられている。ブラケットは、例えば、ボルトで第１電池モジュール２ａに取り付けられている。   The first battery module 2a has a plurality of first battery cells 3a. The first battery cell 3a is a storage battery such as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The plurality of first battery cells 3a are electrically connected to each other and arranged in the X direction. In the state in which the plurality of first battery cells 3a are arranged in this manner, the first battery cells 3a are fixed and integrated with each other by, for example, a pair of end plates (not shown) arranged on both sides in the X direction. Brackets (not shown) for fixing and attaching the first battery module 2a to the housing 4 are attached to both ends (that is, end plates) in the arrangement direction of the first battery modules 2a. The bracket is attached to the first battery module 2a with a bolt, for example.

第２電池モジュール２ｂは、複数の第２電池セル３ｂを有している。第２電池セル３ｂは、リチウムイオン二次電池等の非水電解質二次電池といった蓄電池、または電気二重層キャパシタ等である。複数の第２電池セル３ｂは、互いに電気的に接続されて、Ｘ方向に配列されている。複数の第２電池セル３ｂは、このように配列された状態において、例えば、Ｘ方向の両側に配置された一対のエンドプレート（不図示）により互いに固定され、一体化されている。第２電池モジュール２ｂの配列方向の両端（すなわち、エンドプレート）には、第２電池モジュール２ｂを筐体４に固定して取り付けるためのブラケット（不図示）が取り付けられている。ブラケットは、例えば、ボルトで第２電池モジュール２ｂに取り付けられている。なお、第２電池セル３ｂは、第１電池セル３ａと同等の構成を有している。また、第２電池モジュール２ｂは、第１電池モジュール２ａと同等の構成を有している。   The second battery module 2b has a plurality of second battery cells 3b. The second battery cell 3b is a storage battery such as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The plurality of second battery cells 3b are electrically connected to each other and arranged in the X direction. In the state in which the plurality of second battery cells 3b are arranged in this way, for example, they are fixed and integrated with each other by a pair of end plates (not shown) disposed on both sides in the X direction. Brackets (not shown) for fixing and attaching the second battery module 2b to the housing 4 are attached to both ends (that is, end plates) in the arrangement direction of the second battery module 2b. The bracket is attached to the second battery module 2b with a bolt, for example. In addition, the 2nd battery cell 3b has the structure equivalent to the 1st battery cell 3a. The second battery module 2b has a configuration equivalent to that of the first battery module 2a.

筐体４は、直方体形状を呈している。筐体４は、例えば、鉄、アルミニウム等の金属により形成されている。ここでは、筐体４は、全体的に同じ金属材料により形成されている。筐体４は、第１収容部１０と、第２収容部２０と、蓋部５と、前壁部６と、後壁部７と、を備えている。   The housing 4 has a rectangular parallelepiped shape. The housing 4 is made of, for example, a metal such as iron or aluminum. Here, the housing | casing 4 is formed with the same metal material as a whole. The housing 4 includes a first housing part 10, a second housing part 20, a lid part 5, a front wall part 6, and a rear wall part 7.

第１収容部１０は、複数の第１電池セル３ａを収容している。第１収容部１０は、断面Ｕ字状を呈し、第１底部１１と、一対の側壁部１２とを有している。第１収容部１０の第１底部１１に対向する面は、第１開口Ａ１をなしている。第１底部１１は、矩形状の平板である。第１底部１１の厚さｔ１は、例えば、２０ｍｍである。第１底部１１は、第１電池モジュール２ａが取り付けられる取付け面１１ａと、取付け面１１ａの裏側の裏面１１ｂとを有している。   The 1st accommodating part 10 accommodates the some 1st battery cell 3a. The first accommodating portion 10 has a U-shaped cross section, and has a first bottom portion 11 and a pair of side wall portions 12. A surface facing the first bottom portion 11 of the first accommodating portion 10 forms a first opening A1. The first bottom portion 11 is a rectangular flat plate. The thickness t1 of the first bottom portion 11 is 20 mm, for example. The 1st bottom part 11 has the attachment surface 11a to which the 1st battery module 2a is attached, and the back surface 11b of the back side of the attachment surface 11a.

取付け面１１ａは、第１収容部１０内に露出している。裏面１１ｂは、筐体４の外部に露出している。取付け面１１ａには、Ｘ方向及びＹ方向に２つずつ、合計４つの第１電池モジュール２ａがブラケットにより取り付けられている。なお、第１電池モジュール２ａの数及び配置は、これに限られない。   The attachment surface 11 a is exposed in the first housing portion 10. The back surface 11 b is exposed to the outside of the housing 4. A total of four first battery modules 2a are attached to the attachment surface 11a by brackets, two in the X direction and two in the Y direction. The number and arrangement of the first battery modules 2a are not limited to this.

一対の側壁部１２は、Ｙ方向で互いに対向する矩形状の平板である。一対の側壁部１２の厚さは、例えば、２０ｍｍである。一対の側壁部１２は、第１底部１１のＹ方向の両端部から連続して、Ｚ方向に延びている。第１底部１１と、一対の側壁部１２とは一体的に形成されている。なお、第１底部１１と、一対の側壁部１２とが別体であり、これらの組み合わせにより第１収容部１０が構成されていてもよい。   The pair of side wall portions 12 are rectangular flat plates facing each other in the Y direction. The thickness of the pair of side wall portions 12 is, for example, 20 mm. The pair of side wall portions 12 are continuous from both end portions of the first bottom portion 11 in the Y direction and extend in the Z direction. The first bottom portion 11 and the pair of side wall portions 12 are integrally formed. In addition, the 1st bottom part 11 and a pair of side wall part 12 are separate bodies, and the 1st accommodating part 10 may be comprised by these combination.

第２収容部２０は、複数の第２電池セル３ｂを収容している。第２収容部２０は、断面Ｕ字状を呈し、第２底部２１と、一対の側壁部２２とを有している。第２収容部２０の第２底部２１に対向する面は、第２開口Ａ２をなしている。第２底部２１は、矩形状の平板である。第２底部２１の厚さｔ２は、例えば、３０ｍｍ以上４０ｍｍ以下である。第２底部２１は、第２電池モジュール２ｂが取り付けられる取付け面２１ａと、取付け面２１ａの裏側の裏面２１ｂとを有している。   The second storage unit 20 stores a plurality of second battery cells 3b. The second accommodating portion 20 has a U-shaped cross section, and has a second bottom portion 21 and a pair of side wall portions 22. The surface facing the second bottom portion 21 of the second housing portion 20 forms a second opening A2. The second bottom portion 21 is a rectangular flat plate. The thickness t2 of the second bottom portion 21 is, for example, not less than 30 mm and not more than 40 mm. The second bottom portion 21 has an attachment surface 21a to which the second battery module 2b is attached and a back surface 21b on the back side of the attachment surface 21a.

取付け面２１ａは、第２収容部２０内に露出している。裏面２１ｂは、第１収容部１０側に位置し、第１収容部１０内に露出している。取付け面２１ａには、Ｘ方向及びＹ方向に２つずつ、合計４つの第２電池モジュール２ｂがブラケットにより取り付けられている。なお、第２電池モジュール２ｂの数及び配置は、これに限られない。   The mounting surface 21a is exposed in the second housing portion 20. The back surface 21 b is located on the first housing portion 10 side and is exposed in the first housing portion 10. A total of four second battery modules 2b are attached to the attachment surface 21a by brackets, two in the X direction and two in the Y direction. The number and arrangement of the second battery modules 2b are not limited to this.

一対の側壁部２２は、Ｙ方向で互いに対向する矩形状の平板である。一対の側壁部２２の厚さは、例えば、２０ｍｍである。一対の側壁部２２は、第２底部２１のＹ方向の両端部から連続して、Ｚ方向に延びている。第２底部２１と、一対の側壁部２２とは一体的に形成されている。なお、第２底部２１と、一対の側壁部２２とが別体であり、これらの組み合わせにより第２収容部２０が構成されていてもよい。   The pair of side wall portions 22 are rectangular flat plates facing each other in the Y direction. The thickness of the pair of side wall portions 22 is, for example, 20 mm. The pair of side wall portions 22 extends in the Z direction continuously from both ends in the Y direction of the second bottom portion 21. The second bottom portion 21 and the pair of side wall portions 22 are integrally formed. In addition, the 2nd bottom part 21 and a pair of side wall part 22 are separate bodies, and the 2nd accommodating part 20 may be comprised by these combination.

第２収容部２０は、第２底部２１により、第１開口Ａ１を塞ぐように第１収容部１０上に積み重ねられている。即ち、第１底部１１は、第２収容部２０と反対側に配置され、第２底部２１は、第１収容部１０側に配置されている。第１収容部１０と第２収容部２０とが当接する部分は、例えば、ボルト、溶接等により接合されている。第１収容部１０と第２収容部２０とは、具体的には、一対の側壁部１２の第２収容部２０側の端部と、第２底部２１の裏面２１ｂのＹ方向の両端部とにおいて当接している。   The second accommodating portion 20 is stacked on the first accommodating portion 10 by the second bottom portion 21 so as to close the first opening A1. That is, the first bottom portion 11 is disposed on the side opposite to the second housing portion 20, and the second bottom portion 21 is disposed on the first housing portion 10 side. The portion where the first housing portion 10 and the second housing portion 20 abut is joined by, for example, a bolt, welding, or the like. Specifically, the first accommodating portion 10 and the second accommodating portion 20 are the end portions on the second accommodating portion 20 side of the pair of side wall portions 12 and both end portions in the Y direction of the back surface 21b of the second bottom portion 21. In contact.

第２底部２１の厚さｔ２は、第１底部１１の厚さｔ１よりも厚い。第２底部２１の厚さｔ２は、第１底部１１の厚さｔ１の、例えば、１．５倍以上である。第１底部１１の熱容量（熱マス）は、第１底部１１の厚さｔ１に比例し、第２底部２１の熱容量は、第２底部２１の厚さｔ２に比例する。上述のように、筐体４は、全体的に同じ金属材料により形成されている。このため、第２底部２１の熱容量は、第１底部１１の熱容量よりも大きくなる。また、第２底部２１の熱容量と第１底部１１の熱容量との差は、第２底部２１の厚さｔ２と第１底部１１の厚さｔ１との差に比例する。   The thickness t2 of the second bottom portion 21 is thicker than the thickness t1 of the first bottom portion 11. The thickness t2 of the second bottom portion 21 is, for example, 1.5 times or more the thickness t1 of the first bottom portion 11. The heat capacity (thermal mass) of the first bottom portion 11 is proportional to the thickness t1 of the first bottom portion 11, and the heat capacity of the second bottom portion 21 is proportional to the thickness t2 of the second bottom portion 21. As described above, the housing 4 is entirely formed of the same metal material. For this reason, the heat capacity of the second bottom portion 21 is larger than the heat capacity of the first bottom portion 11. Further, the difference between the heat capacity of the second bottom portion 21 and the heat capacity of the first bottom portion 11 is proportional to the difference between the thickness t2 of the second bottom portion 21 and the thickness t1 of the first bottom portion 11.

蓋部５は、矩形状の平板である。蓋部５の厚さは、例えば、２０ｍｍである。蓋部５は、第２開口Ａ２を塞ぐように第２収容部２０上に設けられている。Ｚ方向から見て、第１底部１１、第２底部２１、及び蓋部５は、互いに完全に重なるようして、この順に設けられている。第２収容部２０と蓋部５とが当接する部分は、例えば、ボルト、溶接等により接合されている。第２収容部２０と蓋部５とは、具体的には、一対の側壁部２２の蓋部５側の端部と、蓋部５の第２収容部２０側の面におけるＹ方向の両端部とにおいて当接している。   The lid 5 is a rectangular flat plate. The thickness of the lid 5 is, for example, 20 mm. The lid portion 5 is provided on the second accommodating portion 20 so as to close the second opening A2. As viewed from the Z direction, the first bottom portion 11, the second bottom portion 21, and the lid portion 5 are provided in this order so as to completely overlap each other. The portion where the second housing portion 20 and the lid portion 5 abut is joined by, for example, a bolt, welding, or the like. Specifically, the second housing portion 20 and the lid portion 5 are the end portions on the lid portion 5 side of the pair of side wall portions 22 and both end portions in the Y direction on the surface of the lid portion 5 on the second housing portion 20 side. And abut.

前壁部６及び後壁部７は、矩形状の平板であり、互いに同形状をなしている。前壁部６及び後壁部７の厚さは、例えば、２０ｍｍである。前壁部６及び後壁部７は、Ｘ方向で互いに対向し、第１収容部１０、第２収容部２０、及び蓋部５を挟み込んでいる。前壁部６及び後壁部７と、第１収容部１０、第２収容部２０、及び蓋部５とが当接する部分は、例えば、ボルト、溶接等により接合されている。   The front wall portion 6 and the rear wall portion 7 are rectangular flat plates and have the same shape. The thickness of the front wall part 6 and the rear wall part 7 is 20 mm, for example. The front wall portion 6 and the rear wall portion 7 face each other in the X direction, and sandwich the first housing portion 10, the second housing portion 20, and the lid portion 5. The portions where the front wall portion 6 and the rear wall portion 7 are in contact with the first housing portion 10, the second housing portion 20, and the lid portion 5 are joined by, for example, bolts, welding, or the like.

第１収容部１０、第２収容部２０、蓋部５、前壁部６、及び後壁部７は、それぞれ別体として構成されている。電池パック１を組み立てるには、例えば、まず、第１収容部１０において、取付け面１１ａに第１電池モジュール２ａを取り付けるとともに、第２収容部２０において、取付け面２１ａに第２電池モジュール２ｂを取り付ける。続いて、第１収容部１０の第１開口Ａ１を塞ぐように、第１収容部１０上に第２収容部２０を積み重ね、第１収容部１０に第２収容部２０を取り付ける。   The 1st accommodating part 10, the 2nd accommodating part 20, the cover part 5, the front wall part 6, and the rear wall part 7 are each comprised as a different body. To assemble the battery pack 1, for example, first, in the first housing portion 10, the first battery module 2 a is attached to the attachment surface 11 a, and in the second housing portion 20, the second battery module 2 b is attached to the attachment surface 21 a. . Subsequently, the second housing portion 20 is stacked on the first housing portion 10 so as to close the first opening A <b> 1 of the first housing portion 10, and the second housing portion 20 is attached to the first housing portion 10.

次に、第２収容部２０の第２開口Ａ２を塞ぐように、第２収容部２０上に蓋部５を取り付ける。続いて、第１収容部１０、第２収容部２０、及び蓋部５をＸ方向で挟み込むようにして、前壁部６及び後壁部７を第１収容部１０、第２収容部２０、及び蓋部５に取り付ける。これにより、電池パック１が組み立てられる。なお、電池パック１は、これ以外の方法により、組み立てられてもよい。   Next, the lid portion 5 is attached on the second housing portion 20 so as to close the second opening A2 of the second housing portion 20. Subsequently, the front wall portion 6 and the rear wall portion 7 are connected to the first housing portion 10, the second housing portion 20, and the first housing portion 10, the second housing portion 20, and the lid portion 5 in the X direction. And attached to the lid 5. Thereby, the battery pack 1 is assembled. The battery pack 1 may be assembled by other methods.

以上説明したように、電池パック１Ａは、第１電池セル３ａ及び第２電池セル３ｂを筐体４内に収容している。第１電池セル３ａ及び第２電池セル３ｂは、使用により、充電及び放電を繰り返す。第１電池セル３ａ及び第２電池セル３ｂは、特に充電時に発熱する。第１電池セル３ａ及び第２電池セル３ｂは、高温により劣化するので、第１電池セル３ａ及び第２電池セル３ｂの劣化を抑えるには、第１電池セル３ａ及び第２電池セル３ｂの熱を放出する必要がある。電池パック１Ａの寿命は、第１電池セル３ａ及び第２電池セル３ｂのうち劣化の大きい方に左右される。すなわち、第１電池セル３ａ及び第２電池セル３ｂの一方で劣化が進むと、電池パック１Ａの寿命が短くなるおそれがある。したがって、電池パック１Ａの寿命を伸ばすためには、第１電池セル３ａ及び第２電池セル３ｂの一方で劣化が進むことを抑制する必要がある。   As described above, the battery pack 1A houses the first battery cell 3a and the second battery cell 3b in the housing 4. The 1st battery cell 3a and the 2nd battery cell 3b repeat charge and discharge by use. The first battery cell 3a and the second battery cell 3b generate heat particularly during charging. Since the 1st battery cell 3a and the 2nd battery cell 3b deteriorate with high temperature, in order to suppress deterioration of the 1st battery cell 3a and the 2nd battery cell 3b, the heat of the 1st battery cell 3a and the 2nd battery cell 3b Need to be released. The lifetime of the battery pack 1A depends on the more deteriorated one of the first battery cell 3a and the second battery cell 3b. That is, if the deterioration of one of the first battery cell 3a and the second battery cell 3b proceeds, the life of the battery pack 1A may be shortened. Therefore, in order to extend the life of the battery pack 1A, it is necessary to suppress the deterioration of one of the first battery cell 3a and the second battery cell 3b.

第１収容部１０の第１電池セル３ａで発生した熱は、第１電池セル３ａから第１底部１１に放出され、その後、第１底部１１から筐体４の外部に放出される。これに対し、第２収容部２０の第２電池セル３ｂで発生した熱は、第２電池セル３ｂから第２底部２１に放出される。なお、第１収容部１０の第１電池セル３ａ及び第２収容部２０の第２電池セル３ｂで発生した熱の一部分は、第１収容部１０及び第２収容部２０内の空気等にも放出されるものの、熱伝導率の違いから、大部分は、第１電池セル３ａが直接接して取り付けられている第１底部１１及び第２電池セル３ｂが直接接して取り付けられている第２底部２１に放出される。   The heat generated in the first battery cell 3 a of the first housing portion 10 is released from the first battery cell 3 a to the first bottom portion 11, and then released from the first bottom portion 11 to the outside of the housing 4. On the other hand, the heat generated in the second battery cell 3b of the second housing part 20 is released from the second battery cell 3b to the second bottom portion 21. Part of the heat generated in the first battery cell 3a of the first housing part 10 and the second battery cell 3b of the second housing part 20 is also transferred to the air in the first housing part 10 and the second housing part 20 Although it is discharged, due to the difference in thermal conductivity, most of the first bottom portion 11 to which the first battery cell 3a is attached in direct contact and the second bottom portion to which the second battery cell 3b is attached in direct contact. 21 is released.

電池パック１Ａの使用時は、通常、筐体４の内部の温度よりも、筐体４の外部の温度の方が低くなる。したがって、筐体４の外部に熱を放出できる第１底部１１に比べて、略全体が筐体４内に位置し、主に筐体４の内部にしか熱を放出できない第２底部２１では、熱が放出され難い。すなわち、第２底部２１の放熱性が、第１底部１１の放熱性よりも低くなっている。したがって、放熱性の点では、第２底部２１の温度は、第１底部１１の温度よりも高くなり易い。仮に、第２底部２１の温度が第１底部１１の温度よりも高くなると、第１底部１１に比べて、第２底部２１では第２電池セル３ｂから熱が放出され難くなる。この結果、第１電池セル３ａと第２電池セル３ｂとの間で放熱性にばらつきが生じるおそれがある。   When the battery pack 1 </ b> A is used, the temperature outside the housing 4 is usually lower than the temperature inside the housing 4. Therefore, compared to the first bottom portion 11 that can release heat to the outside of the housing 4, substantially the whole is located in the housing 4, and the second bottom portion 21 that can mainly release heat only inside the housing 4, Heat is not easily released. That is, the heat dissipation of the second bottom 21 is lower than the heat dissipation of the first bottom 11. Therefore, in terms of heat dissipation, the temperature of the second bottom portion 21 tends to be higher than the temperature of the first bottom portion 11. If the temperature of the second bottom portion 21 is higher than the temperature of the first bottom portion 11, compared to the first bottom portion 11, heat is less likely to be released from the second battery cell 3 b at the second bottom portion 21. As a result, the heat dissipation may vary between the first battery cell 3a and the second battery cell 3b.

そこで、第２収容部２０の第２底部２１の厚さｔ２が、第１収容部１０の第１底部１１の厚さｔ１よりも厚く設定されることにより、第２収容部２０の第２底部２１の熱容量は、第１収容部１０の第１底部１１の熱容量よりも大きく設定されている。熱容量が大きいと、温度が上昇し難くなる。したがって、第２底部２１の温度が上昇することを抑制できる。これにより、第２収容部２０内の第２電池セル３ｂから第２底部２１に熱が放出され易くなるので、第２収容部２０内の第２電池セル３ｂの第２底部２１に対する放熱性が高まる。この結果、第１電池セル３ａの放熱性に対する第１底部１１の影響と、第２電池セル３ｂの放熱性に対する第２底部２１の影響との間のばらつきが抑制される。   Therefore, the thickness t2 of the second bottom portion 21 of the second storage portion 20 is set to be thicker than the thickness t1 of the first bottom portion 11 of the first storage portion 10, whereby the second bottom portion of the second storage portion 20. The heat capacity of 21 is set to be larger than the heat capacity of the first bottom part 11 of the first housing part 10. When the heat capacity is large, the temperature is difficult to rise. Therefore, it can suppress that the temperature of the 2nd bottom part 21 rises. Accordingly, heat is easily released from the second battery cell 3b in the second housing part 20 to the second bottom part 21, so that heat dissipation of the second battery cell 3b in the second housing part 20 with respect to the second bottom part 21 is achieved. Rise. As a result, variation between the influence of the first bottom 11 on the heat dissipation of the first battery cell 3a and the influence of the second bottom 21 on the heat dissipation of the second battery cell 3b is suppressed.

すなわち、第１底部１１の厚さｔ１及び熱容量と、第２底部２１の厚さｔ２及び熱容量とは、第１電池セル３ａの放熱性に対する第１底部１１の影響と、第２電池セル３ｂの放熱性に対する第２底部２１の影響との間のばらつきを抑制するように設定されている。この結果、第１電池セル３ａと第２電池セル３ｂとの間で放熱性にばらつきが生じることを抑制可能となる。また、これに伴い、電池パック１Ａの寿命を向上させることができる。   That is, the thickness t1 and heat capacity of the first bottom portion 11 and the thickness t2 and heat capacity of the second bottom portion 21 are the effects of the first bottom portion 11 on the heat dissipation of the first battery cell 3a and the second battery cell 3b. It sets so that the dispersion | variation between the influence of the 2nd bottom part 21 with respect to heat dissipation may be suppressed. As a result, it is possible to suppress variation in heat dissipation between the first battery cell 3a and the second battery cell 3b. Further, along with this, the life of the battery pack 1A can be improved.

第１収容部１０の第１底部１１に対向する面は、第１開口Ａ１をなし、第２収容部２０は、第２底部２１により、第１開口Ａ１を塞ぐように第１収容部１０上に積み重ねられている。このように、第２底部２１が第１開口Ａ１を塞いでいるため、第１収容部１０が第１開口Ａ１を塞ぐ部材を有していない。したがって、第１収容部１０の構成を簡単にすることができる。   The surface facing the first bottom portion 11 of the first housing portion 10 forms the first opening A1, and the second housing portion 20 is on the first housing portion 10 so as to close the first opening A1 by the second bottom portion 21. Are stacked. Thus, since the 2nd bottom part 21 has block | closed 1st opening A1, the 1st accommodating part 10 does not have a member which block | closes 1st opening A1. Therefore, the structure of the 1st accommodating part 10 can be simplified.

（第２実施形態）
続いて、図３を参照して、第２実施形態について説明する。図３は、第２実施形態に係る電池パックの断面図である。なお、以下では、第１実施形態に係る電池パック１Ａ（図１参照）と異なる点についてのみ説明する。 (Second Embodiment)
Next, a second embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view of the battery pack according to the second embodiment. Hereinafter, only differences from the battery pack 1A according to the first embodiment (see FIG. 1) will be described.

図３に示されるように、第２実施形態に係る電池パック１Ｂでは、第２底部２１の厚さｔ２が第１底部１１の厚さｔ１と同じである。また、第１収容部１０は、例えば、鉄により構成され、第２収容部２０は、例えば、アルミにより構成されている。アルミの熱伝導率は、鉄の熱伝導率よりも高い。すなわち、第２底部２１の熱伝導率が、第１底部１１の熱伝導率よりも高く設定されている。   As shown in FIG. 3, in the battery pack 1 </ b> B according to the second embodiment, the thickness t <b> 2 of the second bottom portion 21 is the same as the thickness t <b> 1 of the first bottom portion 11. Moreover, the 1st accommodating part 10 is comprised, for example with iron, and the 2nd accommodating part 20 is comprised, for example with aluminum. The thermal conductivity of aluminum is higher than that of iron. That is, the thermal conductivity of the second bottom portion 21 is set to be higher than the thermal conductivity of the first bottom portion 11.

熱は、熱伝導率が大きいほど伝わり易い。したがって、第２底部２１の熱伝導率が、第１底部１１の熱伝導率と同一に設定されている場合に比べて、電池パック１Ｂでは、第２電池セル３ｂの熱が、第２底部２１を介して第１収容部１０に放出され易くなるとともに、側壁部２２を介して第２収容部２０の外部に放出され易くなる。すなわち、第２電池セル３ｂの放熱性が高まる。この結果、第１電池セル３ａの放熱性に対する第１底部１１の影響と、第２電池セル３ｂの放熱性に対する第２底部２１の影響との間のばらつきが抑制される。   Heat is more easily transmitted as the thermal conductivity is higher. Therefore, compared with the case where the thermal conductivity of the second bottom portion 21 is set to be the same as the thermal conductivity of the first bottom portion 11, in the battery pack 1B, the heat of the second battery cell 3b is changed to the second bottom portion 21. It becomes easy to discharge | release to the 1st accommodating part 10 via this, and it becomes easy to discharge | release outside the 2nd accommodating part 20 via the side wall part 22. FIG. That is, the heat dissipation of the second battery cell 3b is increased. As a result, variation between the influence of the first bottom 11 on the heat dissipation of the first battery cell 3a and the influence of the second bottom 21 on the heat dissipation of the second battery cell 3b is suppressed.

すなわち、第１底部１１の熱伝導率と、第２底部２１の熱伝導率とは、第１電池セル３ａの放熱性に対する第１底部１１の影響と、第２電池セル３ｂの放熱性に対する第２底部２１の影響との間のばらつきを抑制するように設定されている。この結果、電池パック１Ｂにおいても、第１電池セル３ａと第２電池セル３ｂとの間で放熱性にばらつきが生じることを抑制可能となる。   That is, the thermal conductivity of the first bottom portion 11 and the thermal conductivity of the second bottom portion 21 are the effects of the first bottom portion 11 on the heat dissipation performance of the first battery cell 3a and the heat dissipation performance of the second battery cell 3b. 2 is set so as to suppress variation between the influence of the bottom 21. As a result, also in the battery pack 1B, it is possible to suppress variation in heat dissipation between the first battery cell 3a and the second battery cell 3b.

（第３実施形態）
続いて、図４を参照して、第３実施形態について説明する。図４は、第３実施形態に係る電池パックの断面図である。なお、以下では、第１実施形態に係る電池パック１Ａ（図１参照）と異なる点についてのみ説明する。 (Third embodiment)
Next, a third embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view of the battery pack according to the third embodiment. Hereinafter, only differences from the battery pack 1A according to the first embodiment (see FIG. 1) will be described.

図４に示されるように、第３実施形態に係る電池パック１Ｃでは、第２底部２１の裏面２１ｂに、複数の凹部２３が設けられている。各凹部２３は、取付け面２１ａ側にくぼんだ形状を有している。すなわち、各凹部２３の底部と取付け面２１ａとの距離は、裏面２１ｂの凹部２３以外の部分と取付け面２１ａとの距離よりも短い。   As shown in FIG. 4, in the battery pack 1 </ b> C according to the third embodiment, a plurality of recesses 23 are provided on the back surface 21 b of the second bottom portion 21. Each recess 23 has a shape recessed toward the mounting surface 21a. That is, the distance between the bottom of each recess 23 and the mounting surface 21a is shorter than the distance between the portion of the back surface 21b other than the recess 23 and the mounting surface 21a.

これにより、電池パック１Ｃでは、第２底部２１の裏面２１ｂの表面積が増し、第２底部２１から第１収容部１０に熱が放出され易くなる。したがって、第２底部２１の温度の上昇が更に抑えられ、第２電池セル３ｂの第２底部２１に対する放熱性を更に高めることができる。これにより、電池パック１Ｃでは、第１電池セル３ａの放熱性に対する第１底部１１の影響と、第２電池セル３ｂの放熱性に対する第２底部２１の影響との間のばらつきが更に抑制される。この結果、第１電池セル３ａと第２電池セル３ｂとの間で放熱性にばらつきが生じることを更に抑制可能となる。   Thereby, in the battery pack 1 </ b> C, the surface area of the back surface 21 b of the second bottom portion 21 increases, and heat is easily released from the second bottom portion 21 to the first housing portion 10. Therefore, the rise in the temperature of the second bottom portion 21 is further suppressed, and the heat dissipation performance for the second bottom portion 21 of the second battery cell 3b can be further enhanced. Thereby, in the battery pack 1C, the variation between the influence of the first bottom 11 on the heat dissipation of the first battery cell 3a and the influence of the second bottom 21 on the heat dissipation of the second battery cell 3b is further suppressed. . As a result, it is possible to further suppress the variation in heat dissipation between the first battery cell 3a and the second battery cell 3b.

（第４実施形態）
続いて、図５を参照して、第４実施形態について説明する。図５は、第４実施形態に係る電池パックの断面図である。なお、以下では、第１実施形態に係る電池パック１Ａ（図１参照）と異なる点についてのみ説明する。 (Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view of the battery pack according to the fourth embodiment. Hereinafter, only differences from the battery pack 1A according to the first embodiment (see FIG. 1) will be described.

図５に示されるように、第４実施形態に係る電池パック１Ｄでは、第２底部２１が、第１開口Ａ１に嵌合する凸部２４を裏面２１ｂに有している。第２収容部２０は、凸部２４が第１開口Ａ１に嵌合した状態で、第１収容部１０上に積み重ねられている。   As shown in FIG. 5, in the battery pack 1 </ b> D according to the fourth embodiment, the second bottom portion 21 has a convex portion 24 fitted in the first opening A <b> 1 on the back surface 21 b. The 2nd accommodating part 20 is stacked on the 1st accommodating part 10 in the state which the convex part 24 fitted to 1st opening A1.

このように、電池パック１Ｄでは、第２底部２１は、裏面２１ｂに凸部２４を有しているので、第２底部２１の熱容量を、凸部２４の体積に対応する分だけ増大させることができる。これにより、第２底部２１の温度の上昇が更に抑えられるので、第２底部２１に対する第２電池セル３ｂの放熱性を更に高めることができる。この結果、第１電池セル３ａと第２電池セル３ｂとの間で放熱性にばらつきが生じることを更に抑制可能となる。また、別体として構成された第１収容部１０と第２収容部２０とを組み立てる際に、凸部２４を利用することにより、第１収容部１０と第２収容部２０との間の位置決めを容易に行うことができる。したがって、電池パック１Ｄの組み立てにおける作業性を向上させることができる。   Thus, in the battery pack 1D, since the second bottom portion 21 has the convex portion 24 on the back surface 21b, the heat capacity of the second bottom portion 21 can be increased by an amount corresponding to the volume of the convex portion 24. it can. Thereby, since the temperature rise of the 2nd bottom part 21 is further suppressed, the heat dissipation of the 2nd battery cell 3b with respect to the 2nd bottom part 21 can further be improved. As a result, it is possible to further suppress the variation in heat dissipation between the first battery cell 3a and the second battery cell 3b. Moreover, when assembling the 1st accommodating part 10 and the 2nd accommodating part 20 which were comprised separately, the positioning between the 1st accommodating part 10 and the 2nd accommodating part 20 is utilized by utilizing the convex part 24. Can be easily performed. Therefore, workability in assembling the battery pack 1D can be improved.

以上、実施形態について説明したが、本発明に係る電池パックは、上記実施形態に限定されない。例えば、電池パック１Ａ〜電池パック１Ｄは、第１収容部１０と蓋部５との間に、第１収容部１０と蓋部５とが対向する方向（Ｚ方向）に沿って順次積み重ねられた複数の第２収容部２０を備えていてもよい。   As mentioned above, although embodiment was described, the battery pack which concerns on this invention is not limited to the said embodiment. For example, the battery pack 1A to the battery pack 1D are sequentially stacked between the first housing portion 10 and the lid portion 5 along a direction (Z direction) in which the first housing portion 10 and the lid portion 5 face each other. A plurality of second accommodating portions 20 may be provided.

また、電池パック１Ａ、電池パック１Ｃ及び電池パック１Ｄにおいて、第１収容部１０と第２収容部２０とは、同じ金属材料で構成されているとしたが、異なる金属材料で構成されていてもよい。例えば、第２収容部２０の熱伝導率が、第１収容部１０の熱伝導率よりも高くなるように、各金属材料を選択してもよい。また、例えば、第２収容部２０の比熱容量が、第１収容部１０の比熱容量よりも高くなるように、各金属材料を選択してもよい。これにより、第２電池セル３ｂの熱が第２底部２１に更に放出され易くなるので、第１電池セル３ａと第２電池セル３ｂとの間で放熱性にばらつきが生じることを更に抑制可能となる。   Further, in the battery pack 1A, the battery pack 1C, and the battery pack 1D, the first housing portion 10 and the second housing portion 20 are made of the same metal material, but may be made of different metal materials. Good. For example, each metal material may be selected such that the thermal conductivity of the second storage unit 20 is higher than the thermal conductivity of the first storage unit 10. Further, for example, each metal material may be selected so that the specific heat capacity of the second storage unit 20 is higher than the specific heat capacity of the first storage unit 10. As a result, the heat of the second battery cell 3b is more easily released to the second bottom portion 21, so that it is possible to further suppress the variation in heat dissipation between the first battery cell 3a and the second battery cell 3b. Become.

電池パック１Ａ〜電池パック１Ｄにおいて、第１収容部１０、第２収容部２０、蓋部５、前壁部６、及び後壁部７は、それぞれ別体として構成されているとしたが、このうち２つ以上が一体化されていてもよい。   In the battery pack 1A to the battery pack 1D, the first housing part 10, the second housing part 20, the lid part 5, the front wall part 6, and the rear wall part 7 are configured as separate bodies. Two or more of them may be integrated.

電池パック１Ａ〜電池パック１Ｄにおいて、第１収容部１０が第１電池セル３ａを収容し、第２収容部２０が第２電池セル３ｂを収容していればよく、第１電池セル３ａが、第１底部１１の取付け面１１ａ以外の場所に取り付けられていてもよいし、第２電池セル３ｂが第２底部２１の取付け面２１ａ以外の場所に取り付けられていてもよい。例えば、第１電池セル３ａが、側壁部１２に取り付けられているとともに、第２電池セル３ｂが側壁部２２に取り付けられている場合、側壁部１２から第１底部１１に第１電池セル３ａの熱が伝わるとともに、側壁部２２から第２底部２１に第２電池セル３ｂの熱が伝わる。したがって、このような場合であっても、第１電池セル３ａの放熱性に対する第１底部１１の影響と、第２電池セル３ｂの放熱性に対する第２底部２１の影響との間のばらつきが抑制されていれば、第１電池セル３ａと第２電池セル３ｂとの間での放熱性にばらつきが生じることを抑制可能となる。   In the battery pack 1A to the battery pack 1D, it is sufficient that the first storage unit 10 stores the first battery cell 3a, the second storage unit 20 stores the second battery cell 3b, and the first battery cell 3a is It may be attached to a place other than the attachment surface 11 a of the first bottom part 11, or the second battery cell 3 b may be attached to a place other than the attachment surface 21 a of the second bottom part 21. For example, when the 1st battery cell 3a is attached to the side wall part 12 and the 2nd battery cell 3b is attached to the side wall part 22, the 1st battery cell 3a of the 1st bottom part 11 from the side wall part 12 is attached. While heat is transmitted, heat of the second battery cell 3 b is transmitted from the side wall portion 22 to the second bottom portion 21. Therefore, even in such a case, variation between the influence of the first bottom 11 on the heat dissipation of the first battery cell 3a and the influence of the second bottom 21 on the heat dissipation of the second battery cell 3b is suppressed. If it is made, it will become possible to suppress that dispersion | variation arises in the heat dissipation between the 1st battery cell 3a and the 2nd battery cell 3b.

電池パック１Ｂでは、第２底部２１の熱伝導率が、第１底部１１の熱伝導率よりも高く設定されていればよく、一対の側壁部２２の熱伝導率が、一対の側壁部１２の熱伝導率と同じで、かつ、一対の側壁部２２の熱容量が、一対の側壁部１２の熱容量と同じであってもよい。   In the battery pack 1 </ b> B, it is sufficient that the thermal conductivity of the second bottom portion 21 is set higher than the thermal conductivity of the first bottom portion 11, and the thermal conductivity of the pair of side wall portions 22 is equal to that of the pair of side wall portions 12. The heat capacity of the pair of side wall portions 22 may be the same as the heat capacity of the pair of side wall portions 12.

電池パック１Ａ及び電池パック１Ｂでは、第１収容部１０の第１底部１１に対向する面は、第１開口Ａ１をなしているが、第１底部１１に対向する蓋部が第１収容部１０に設けられていてもよい。蓋部は、例えば、矩形状の平板とすることができる。このような蓋部を第２底部２１とともに機能させることにより、第２電池セル３ｂの放熱性を高めることができる。蓋部の厚さは、第２底部２１及び蓋部の熱容量が所望の値となるよう適宜調整可能である。なお、蓋部は、第２電池セル３ｂの放熱性の向上に実質的に寄与しない薄い板であってもよい。   In the battery pack 1 </ b> A and the battery pack 1 </ b> B, the surface facing the first bottom portion 11 of the first housing portion 10 forms the first opening A <b> 1, but the lid portion facing the first bottom portion 11 is the first housing portion 10. May be provided. The lid portion can be a rectangular flat plate, for example. By functioning such a lid portion together with the second bottom portion 21, the heat dissipation of the second battery cell 3b can be enhanced. The thickness of the lid portion can be adjusted as appropriate so that the heat capacities of the second bottom portion 21 and the lid portion have desired values. The lid may be a thin plate that does not substantially contribute to the improvement of the heat dissipation of the second battery cell 3b.

電池パック１Ｃにおいて、複数の凹部２３の代わりに、第１収容部１０側に突出する複数の凸部が設けられることにより、裏面２１ｂの表面積が増大されていてもよい。凸部が設けられている場合は、凹部２３が設けられている場合に比べて第２底部２１の体積が増大するので、第２底部２１の熱容量を更に増大させることができる。なお、凹部２３が設けられている場合は、凸部が設けられている場合よりも取り扱いが容易である。   In the battery pack 1 </ b> C, instead of the plurality of recesses 23, the surface area of the back surface 21 b may be increased by providing a plurality of projections protruding toward the first housing portion 10. Since the volume of the 2nd bottom part 21 increases compared with the case where the recessed part 23 is provided when the convex part is provided, the heat capacity of the 2nd bottom part 21 can further be increased. In addition, when the recessed part 23 is provided, handling is easier than the case where the convex part is provided.

１Ａ〜１Ｄ…電池パック、２ａ…第１電池モジュール、２ｂ…第２電池モジュール、３ａ…第１電池セル、３ｂ…第２電池セル、４…筐体、１０…第１収容部、１１…第１底部、２０…第２収容部、１１…第１底部、２１ｂ…裏面、２３…凹部、２４…凸部、Ａ１…第１開口、Ａ２…第２開口、ｔ１，ｔ２…厚さ。   DESCRIPTION OF SYMBOLS 1A-1D ... Battery pack, 2a ... 1st battery module, 2b ... 2nd battery module, 3a ... 1st battery cell, 3b ... 2nd battery cell, 4 ... housing | casing, 10 ... 1st accommodating part, 11 ... 1st DESCRIPTION OF SYMBOLS 1 bottom part, 20 ... 2nd accommodating part, 11 ... 1st bottom part, 21b ... Back surface, 23 ... Recessed part, 24 ... Convex part, A1 ... 1st opening, A2 ... 2nd opening, t1, t2 ... Thickness.

Claims (7)

第１電池セル及び第２電池セルを筐体内に収容する電池パックであって、
前記筐体は、
第１底部を有し、前記第１電池セルを収容する第１収容部と、
第２底部を有し、前記第２電池セルを収容する第２収容部と、を備え、
前記第２収容部は、前記第１収容部上に積み重ねられ、
前記第１底部は、前記第２収容部と反対側に配置され、
前記第２底部は、前記第１収容部側に配置され、
前記第２底部の熱容量は、前記第１底部の熱容量よりも大きい、電池パック。 A battery pack that houses the first battery cell and the second battery cell in a housing,
The housing is
A first housing portion having a first bottom and housing the first battery cell;
A second housing portion having a second bottom portion and housing the second battery cell,
The second housing part is stacked on the first housing part,
The first bottom portion is disposed on the opposite side of the second housing portion,
The second bottom portion is disposed on the first housing portion side,
The battery pack has a heat capacity of the second bottom portion that is larger than a heat capacity of the first bottom portion. 前記第２底部の厚さは、前記第１底部の厚さよりも厚い、請求項１に記載の電池パック。   The battery pack according to claim 1, wherein a thickness of the second bottom portion is larger than a thickness of the first bottom portion. 第１電池セル及び第２電池セルを筐体内に収容する電池パックであって、
前記筐体は、
第１底部を有し、前記第１電池セルを収容する第１収容部と、
第２底部を有し、前記第２電池セルを収容する第２収容部と、を備え、
前記第２収容部は、前記第１収容部上に積み重ねられ、
前記第１底部は、前記第２収容部と反対側に配置され、
前記第２底部は、前記第１収容部側に配置され、
前記第２底部の熱伝導率は、前記第１底部の熱伝導率よりも高い、電池パック。 A battery pack that houses the first battery cell and the second battery cell in a housing,
The housing is
A first housing portion having a first bottom and housing the first battery cell;
A second housing portion having a second bottom portion and housing the second battery cell,
The second housing part is stacked on the first housing part,
The first bottom portion is disposed on the opposite side of the second housing portion,
The second bottom portion is disposed on the first housing portion side,
The battery pack has a thermal conductivity of the second bottom portion higher than that of the first bottom portion. 前記第１収容部において、前記第１電池セルは、前記第１底部に取り付けられており、
前記第２収容部において、前記第２電池セルは、前記第２底部に取り付けられている、請求項１〜請求項３のいずれか一項に記載の電池パック。 In the first housing portion, the first battery cell is attached to the first bottom portion,
4. The battery pack according to claim 1, wherein the second battery cell is attached to the second bottom portion in the second housing portion. 5. 前記第１収容部の前記第１底部に対向する面が第１開口をなし、
前記第２収容部は、前記第２底部により、前記第１開口を塞ぐように前記第１収容部上に積み重ねられている、請求項１〜請求項４のいずれか一項に記載の電池パック。 A surface facing the first bottom of the first housing portion forms a first opening,
5. The battery pack according to claim 1, wherein the second housing portion is stacked on the first housing portion so as to close the first opening by the second bottom portion. 6. . 前記第２底部の前記第１収容部側に位置する面には、複数の凹部が設けられている、請求項５に記載の電池パック。   The battery pack according to claim 5, wherein a plurality of recesses are provided on a surface of the second bottom portion located on the first housing portion side. 前記第１収容部と前記第２収容部とは、別体として構成されており、
前記第２底部は、前記第１収容部側に位置する面に、前記第１開口に嵌合する凸部を有している、請求項５又は６に記載の電池パック。 The first housing part and the second housing part are configured as separate bodies,
7. The battery pack according to claim 5, wherein the second bottom portion has a convex portion that fits into the first opening on a surface located on the first housing portion side.
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JP2014149992A (en) * 2013-02-01 2014-08-21 Toyota Industries Corp Battery pack
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JP2015115167A (en) * 2013-12-11 2015-06-22 株式会社東芝 Heating element accommodation device

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