WO2019044242A1 - Battery module - Google Patents

Battery module Download PDF

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Publication number
WO2019044242A1
WO2019044242A1 PCT/JP2018/027038 JP2018027038W WO2019044242A1 WO 2019044242 A1 WO2019044242 A1 WO 2019044242A1 JP 2018027038 W JP2018027038 W JP 2018027038W WO 2019044242 A1 WO2019044242 A1 WO 2019044242A1
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WO
WIPO (PCT)
Prior art keywords
battery
battery module
recess
present
battery group
Prior art date
Application number
PCT/JP2018/027038
Other languages
French (fr)
Japanese (ja)
Inventor
ソクチョル 申
将成 織田
茂樹 牧野
航 佐藤
中野　洋一
石津　竹規
Original Assignee
日立オートモティブシステムズ株式会社
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Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2019044242A1 publication Critical patent/WO2019044242A1/en

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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
    • 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
    • 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
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • 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
    • 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
    • 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
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/227—Organic material
    • 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
    • H01M50/271—Lids or covers for the racks or secondary casings
    • 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

Definitions

  • the present invention relates to a battery module.
  • Examples of the on-vehicle secondary battery include a lithium ion secondary battery, a lead storage battery, and a nickel hydrogen battery.
  • lithium ion secondary batteries generally have higher discharge potential than lead batteries and nickel hydrogen batteries, so that miniaturization and high energy density are possible, which is considered promising.
  • lithium ion secondary batteries for full-scale application.
  • it is effective, for example, to input / output a large current from the battery as well as to increase the potential.
  • the temperature difference between the cells in the battery group is small Furthermore, it is desirable that the maximum ultimate temperature of the batteries present in the battery group be low. This is because when the temperature difference between the unit cells is large and the maximum temperature reached is high, the difference in deterioration is likely to occur between the unit cells. Since the characteristics of the battery group tend to be limited by the characteristics of the most deteriorated battery among the cells included in the battery group, it is necessary to design a battery group in which a specific battery does not deteriorate.
  • Patent Document 1 a partition is provided between the unit cells to secure a space. Furthermore, the space is opened to the outside from the ventilation window provided in the case (the case for storing a plurality of batteries), and the heat dissipation is enhanced.
  • the present invention is made in view of the above-mentioned subject, and an object of the present invention is to provide a battery module which combines heat dissipation and waterproofness.
  • a battery module includes a first battery group in which a plurality of battery cells are stacked, a second battery group in which a plurality of battery cells are stacked, and the first battery
  • a battery module having a housing for storing a group and a second battery group, wherein the housing is provided with a recess, and the recess is disposed between the first battery group and the second battery group It is characterized by being.
  • a battery module having both heat dissipation and waterproof properties by providing a recess in the housing and arranging the recess between the first battery group and the second battery group. .
  • FIG. 21 is an exploded perspective view schematically showing an example of a battery module configuration of Examples 1 to 7.
  • FIG. 21 is an exploded perspective view schematically showing an example of a battery module configuration of Examples 8 to 10.
  • FIG. 7 is an exploded perspective view schematically showing an example of a battery module configuration of Comparative Example 1;
  • FIG. 6 is a graph comparing the temperature rise ratio of the battery group in Examples 1 to 3 and Comparative Example 1.
  • FIG. FIG. 16 is a graph comparing the temperature rise ratio of the battery group in Examples 4 to 7 and Comparative Example 1.
  • FIG. FIG. 16 is a graph comparing the temperature rise ratios of the battery groups in Examples 8 to 10 and Comparative Example 1.
  • the present embodiment is not limited to the following contents at all, and can be implemented with arbitrary modifications without departing from the scope of the present invention.
  • the cooling environment in the present invention is an example, and can be applied to the case of using other refrigerants other than air and water.
  • the lithium ion secondary battery was illustrated as a secondary battery in this invention, this structure is applicable also to another type of storage battery.
  • the components of the lithium ion secondary battery can be effectively used regardless of their kind. That is, in the present invention, an electrode made of an Al current collector foil and a positive electrode material having a layered structure is used as a positive electrode, and an electrode made of a Cu current collector foil and a carbon material is used as a negative electrode.
  • Al foil is used for the current collection foil of a negative electrode, it is possible to improve heat dissipation.
  • a prismatic battery is used in the present embodiment as the shape of the lithium ion battery, the effect can be obtained even if the battery is, for example, a laminate type or cylindrical type battery known as other shapes.
  • the number of battery groups 1A and 1B included in the housing 15 is such that the battery side surfaces physically and thermally contact the side surfaces of the housing 15 as in the configuration according to the present invention. Any number may be used as long as the heat radiation path from the side of 1B can be shortened, but preferably an even number is preferable to ensure the stability of the battery module.
  • the number of batteries constituting the battery groups 1A and 1B can be the configuration in the present invention, and can be any number as long as a desired voltage and capacity can be secured within the housing 15. An effect is obtained.
  • the heat radiation effect the smaller the number of stacked cells in one battery group 1A, 1B, the more effective the effect, but it is preferably 100 or less, more preferably 20 or less, and most preferably 10 or less. .
  • the battery can be made compact and have both cooling properties.
  • the effects of the present invention can be obtained even if the number of batteries of the battery groups 1A and 1B is not necessarily the same.
  • the effect of the present invention can be obtained even when the number of one battery in the battery group is one or more compared to the number of the other battery.
  • the effects of the present invention can be obtained even if, for example, an insulating sheet or a member having high thermal conductivity is disposed between the unit cells forming the battery group, and the effects of the present invention can be obtained even if they are not disposed. Further, the effects of the present invention can be obtained even if a three-dimensional structure such as projections or grooves of various shapes such as a rail shape or a dot shape is introduced to the insulating sheet or the member having high thermal conductivity.
  • a material with high thermal conductivity such as aluminum, aluminum die casting, copper, iron or the like can be used as the material of these members.
  • polypropylene, polyamide, polyetherimide, PPS, PPA, PBT or the like, or high thermal conductivity resin can be used.
  • the cell groups 1A and 1B physically restrain the cells by using a fixing jig.
  • a fixing jig As the material of the fixing jig, when the side surface of the unit cell 2 is covered with the insulating material, a material with high thermal conductivity such as aluminum, aluminum die casting, copper, iron or the like can be used.
  • a material with high thermal conductivity such as aluminum, aluminum die casting, copper, iron or the like can be used.
  • polypropylene, polyamide, polyetherimide, PPS, PPA, PBT or the like, or high thermal conductivity resin can be used.
  • the present invention is not limited to the method of restraint.
  • the effect is exhibited even when they are fixed by using two sets of fixing jigs. Further, even if at least a part of the fixing jig is the housing 15, the effect of the present invention is obtained. Furthermore, one side of the two battery groups used a common fixing jig, and the other side had an effect using separate fixing jigs.
  • each member such as the housing 15 and the battery groups 1A and 1B is not particularly limited.
  • the effect of the present invention can be exhibited even by adhesion with an adhesive or connection via a fixing device such as a bolt or a nut.
  • a fixing device such as a bolt or a nut.
  • casing 15 exemplifies the rectangular parallelepiped which has the recessed part 16 in this embodiment, the shape in particular is not limited.
  • the effect in the present invention is not limited to the current application condition and the cooling condition to the battery module.
  • Examples of the type of the housing 15 include, but are not limited to, a resin housing and a metal housing.
  • a casing 15 made of a heat conductive metal such as aluminum, aluminum die cast, copper, iron or the like is preferable.
  • a heat conductive grease or sheet may be interposed between the recess 16 and the battery group.
  • the present invention is particularly effective for miniaturizing a 48V secondary battery module which is driven at high output and without a cooling fan.
  • Example Hereinafter, the present invention will be described in more detail based on examples and comparative examples.
  • the descriptions “x direction, y direction, z direction” will be used, but the directions correspond to the directions described at the lower left of each drawing.
  • a unit cell 2 is formed by winding an electrode made of an Al current collector foil and a positive electrode material having a layered structure as a positive electrode, and an electrode made of a Cu current collector foil and a carbon material as a negative electrode.
  • Six batteries were stacked as shown in FIG. 1, and the periphery thereof was fixed using a fixing jig 13 to obtain a battery group 1A (1B).
  • the unit cell 2 includes a pair of wide surfaces, a pair of narrow surfaces, a bottom surface, and an upper surface facing the bottom surface, and a positive electrode terminal 3 and a negative electrode terminal 4 are provided on the upper surface.
  • the securing jig 13 includes a pair of securing jigs 13A for securing the unit cells 2 in the z direction and a pair of securing jigs 13B for securing the unit cells 2 in the x direction.
  • the tool 13A and the securing jig 13B are fixed by the fixing bracket 12, respectively.
  • FIG. 2 shows a battery module 10 containing the battery groups 1A and 1B shown in FIG.
  • the battery group 1A (1B) described above is housed in the housing 15.
  • the housing 15 is provided with a recess, and the recess 16 is in close contact with the side surfaces of the battery groups 1A and 1B.
  • a space 14 for arranging electrical components is provided in a space facing the space in which the battery groups 1A and 1B are stored.
  • a circuit board, a fuse, and a mechanical switch for managing charge and discharge of the unit cell 2 are provided in this space. Electrical components that ensure the safety of the battery pack 10 are disposed. After the battery groups 1A and 1B and the electrical components are stored, the opening of the housing 15 is covered by the lid 11 to constitute the battery module 10.
  • the length of the recess in the recess 16 in the depth direction (y direction) is set to 100% of the length in the y direction of the battery group.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air.
  • the calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • Example 2 the length of the recess in the recess 16 in the depth direction (y direction) is 50%.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air.
  • the calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • the third embodiment will be described.
  • the length of the recess in the recess 16 in the depth direction (y direction) is 25%.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air.
  • the calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • Example 4 the length in the depth direction (y direction) of the recess in the recess 16 is 100%, and the width (x direction) of the recess is 1.7% of the size in the x direction of the housing.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • Example 5 the length in the depth direction (y direction) of the recess of the recess 16 is 100%, and the width (x direction) of the recess is 3.3% of the size in the x direction of the housing.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • Example 6 the fifth embodiment will be described.
  • the length in the depth direction (y direction) of the recess in the recess 16 is 100%, and the width (x direction) of the recess is 6.7% of the size in the x direction of the housing.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • Example 7 the fifth embodiment will be described.
  • the length in the depth direction (y direction) of the recess in the recess 16 is 100%, and the width (x direction) of the recess is 10.0% of the size in the x direction of the housing.
  • a current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
  • the eighth embodiment differs from the first embodiment in that a liquid cooling pipe 17 is provided around the recess 16 as shown in FIG.
  • the length of the width (y direction) of the liquid cooling pipe was 100% of the length of the battery groups 1A and 1B in the y direction.
  • a current was applied to the battery module 20. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the present example gives the same current application conditions and surrounding cooling environment as the examples 1 to 3 to the battery of the above configuration, and the result when the battery is in a substantially steady state is shown in FIG.
  • Example 9 differs from Example 8 in that the length of the width (y direction) of the liquid-cooled pipe is 50% of the length of the battery groups 1A and 1B in the y direction.
  • a current was applied to the battery module 20. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the present example gives the same current application conditions and surrounding cooling environment as the examples 1 to 3 to the battery of the above configuration, and the result when the battery is in a substantially steady state is shown in FIG.
  • Example 10 differs from Example 8 in that the length of the width (y direction) of the liquid-cooled pipe is 25% of the length in the y direction of the battery groups 1A and 1B.
  • a current was applied to the battery module 20. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average.
  • the present example gives the same current application conditions and surrounding cooling environment as the examples 1 to 3 to the battery of the above configuration, and the result when the battery is in a substantially steady state is shown in FIG.
  • Comparative example 1 In Comparative Example 1, an electrode made of an Al current collector foil and a positive electrode material having a layered structure as a positive electrode, and an electrode made of an Al current collector foil and a spinel oxide as a negative electrode are single electrodes formed by winding those electrodes.
  • the batteries 2 and 6 were stacked as described in FIG. 1, and the periphery was fixed using a fixing pressure jig to obtain a battery group.
  • the center block 18 is provided between the battery groups 1A and 1B and stored in the housing 15.
  • the present comparative example gives the battery of the above-described configuration the same current application conditions and surrounding cooling environment as in Examples 1 to 3, and exemplifies the results when the battery is in a substantially steady state.
  • FIG. 5 is an example to which the present invention is applied together with Comparative Example 1, in which the temperature rise rate of the unit cell is described on the vertical axis, and the cell number of the unit cell 2 is described on the horizontal axis.
  • the cell numbers are as shown in FIG. Moreover, since the behavior similar to that of the battery groups 1A and 1B is shown, the result of the battery group 1A is added.
  • Example 1 The temperature rise ratio of Example 1, 2 and 3 is shown.
  • the temperature rise ratio indicates the temperature rise of the other battery cells when the maximum temperature of the battery cells in Comparative Example 1 is 100%.
  • Temperature rise ratio (temperature of evaluation target battery cell / maximum temperature of battery cell in comparative example 1) ⁇ 100.
  • the recessed part 16 heat radiation space
  • the center block 18 was installed between two battery group 1A, 1B.
  • the length in the depth direction (y direction) of the recess of the recess is 100%, 50%, and 25% of the length in the y direction of battery group 1A (1B), respectively.
  • the width of the recess is constant at about 3.3% of the length of the housing in the x direction.
  • the temperature increase ratio of Examples 1 to 3 in which the heat dissipating concave portion is provided is lower than that of Comparative Example 1. This is because the heat generated during charge and discharge is dissipated from the recess.
  • This result indicates that providing the recess 16 in the housing 15 is very effective in the air cooling method.
  • the larger the contact area between the recess and the battery group the more effective it is for air cooling.
  • Comparative Example 1 and Examples 1 to 3 it can be seen that the temperature increase ratio of cell numbers 3 and 4 is higher than the temperature increase ratio of the other battery cells of the same battery module.
  • the cell numbers 3 and 4 are located at the centers of the respective battery groups, and the heat transfer path is long and the heat dissipation is low.
  • FIG. 6 shows the temperature increase ratio of Examples 4 to 7 which is an example to which the present invention is applied together with Comparative Example 1.
  • the length in the depth direction (y direction) of the recess of the recess is set to 100% of the length in the y direction of the battery group 1A (1B), and the width of the recess (x direction) Of 1.7%, 3.3%, 6.7%, and 10.0% of the size of the housing 15 in the x direction, respectively.
  • the temperature rise ratio of Examples 4 to 7 in which the heat dissipating concave portion is provided is lower than that of Comparative Example 1. This is because the heat generated during charge and discharge is dissipated from the recess.
  • Examples 4 to 7 have different recess widths, and the temperature rise rates are also different.
  • the width of the recess is preferably 1.7% or more, and more preferably 3.3% or more and 10% or less of the housing size in the same direction of the width. It should be noted that when the size of the case is limited, if the width of the recess is too wide, the heat transfer area of the case itself decreases, so it is considered that the temperature rise rate is higher than in Examples 1 to 3.
  • FIG. 7 shows the temperature increase ratio of Examples 8 to 10 which is an example to which the present invention is applied together with Comparative Example 1. As described above, when the cooling pipe 17 is used, the cooling efficiency is improved, and the effect is enhanced.
  • the present invention is summarized as above.
  • the battery module according to the present invention includes a first battery group (1A) in which a plurality of battery cells (2) are stacked, and a second battery group (1B) in which a plurality of battery cells (2) are stacked.
  • a housing (15) for housing the first battery group (1A) and the second battery group (1B), the housing (15) being provided with a recess (16), the recess (16) ) Are disposed between the first battery group (1A) and the second battery group (1B).
  • the cooling pipe 17 it is possible to provide a small-sized battery module with high cooling performance without increasing the size of the battery module. Furthermore, since the recess of the housing 15 is arranged to face the space where the electrical components are arranged, not only the heat dissipation is improved compared to the conventional battery module, but it is more resistant to crushing in the y direction. It becomes a structure. In addition, since the hard battery groups 1A and 1B are disposed in the x direction and the z direction, crushing is strong.
  • fins may be provided in the recess 16. With such a structure, the heat dissipation of the battery group is further improved. Further, as described above, when the cooling pipe 17 is provided in the recess 16, the heat dissipation is further improved.
  • a heat dissipation member having better heat dissipation than the housing 15 may be disposed in the recess 16.
  • the member having a good heat dissipation property referred to here is, for example, a member in which a filler is kneaded into a resin, or a metal member having a better heat dissipation property.
  • the battery module includes the securing plate for securing the plurality of battery cells, and the securing plate (13) is a first securing plate (13) corresponding to the first battery group. And a second securing plate (13) corresponding to the second battery group.
  • the adhesion of each battery group can be increased to improve the heat dissipation.
  • the width of the recess is 1.7% or more of the width of the housing (15). With such a configuration, a higher heat dissipation effect can be obtained.
  • the present invention is not limited to the above-mentioned embodiment, and various designs are possible in the range which does not deviate from the spirit of the present invention described in the claim. It is possible to make changes.
  • the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to one having all the described configurations.
  • part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Furthermore, with respect to a part of the configuration of each embodiment, it is possible to add / delete / replace other configurations.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present invention addresses the problem of providing a battery module which has both heat dissipation properties and waterproof properties. In order to achieve the above-described purpose, a battery module according to the present invention comprises a first battery group in which a plurality of cells are laminated, a second battery group in which a plurality of cells are laminated, and a case which contains the first battery group and the second battery group; and this battery module is characterized in that the case is provided with a recess and this recess is arranged between the first battery group and the second battery group.

Description

電池モジュールBattery module
　本発明は、電池モジュールに関する。 The present invention relates to a battery module.
　環境問題・資源枯渇問題を背景にして、地球環境の保全に向けた、環境負荷の低い省エネルギーな製品の開発が求められている。ＣＯ２量の削減につながる製品のひとつとして、ハイブリッド電気自動車や電気自動車に代表されるエコカーに注目が集まっており、その販売台数が伸びている。これらのエコカーに搭載される車載用の二次電池への需要も高まっている。 In the background of environmental problems and resource depletion problems, development of energy-saving products with low environmental impact for preservation of the global environment is required. As one of the products leading to the reduction of the amount of CO 2, eco-cars represented by hybrid electric vehicles and electric vehicles are attracting attention, and their sales volume is growing. There is also a growing demand for in-vehicle secondary batteries installed in these eco-cars.
　車載用二次電池の例としては、リチウムイオン二次電池や、鉛蓄電池、ニッケル水素電池などが挙げられる。この中で、リチウムイオン二次電池は一般に、鉛電池やニッケル水素電池などに比べて放電電位が高いため、小型・高エネルギー密度化が可能であり、有望視されている。 Examples of the on-vehicle secondary battery include a lithium ion secondary battery, a lead storage battery, and a nickel hydrogen battery. Among these, lithium ion secondary batteries generally have higher discharge potential than lead batteries and nickel hydrogen batteries, so that miniaturization and high energy density are possible, which is considered promising.
　本格適用に向けてリチウムイオン二次電池に求められる点には例えば、更なる高エネルギー密度化、高出力密度化、長寿命化等があげられる。電池を高出力化するためには高電位化とともに、例えば、大電流を電池から入・出力させる事が有効である。 For example, higher energy density, higher power density, and longer life can be cited as the points required of lithium ion secondary batteries for full-scale application. In order to increase the output of the battery, it is effective, for example, to input / output a large current from the battery as well as to increase the potential.
　しかし大電流を電池から入・出力させる場合、電池の内部抵抗に由来する発熱が電池内部で生じる。発生した熱を十分に電池から取り除く事ができなかった場合、電池温度が上昇する。リチウムイオン電池の電池容量や内部抵抗等の電池特性は、電池温度によって劣化傾向が異なり、特に電池温度が高ければ高いほど電池劣化が進み、容量低下や内部抵抗上昇が起こる場合が多い。そこで、電池の放熱性能を向上させる技術開発が必要となっている。 However, when a large current is input / output from the battery, heat is generated inside the battery due to the internal resistance of the battery. If the generated heat can not be sufficiently removed from the battery, the battery temperature will rise. The battery characteristics such as the battery capacity and the internal resistance of the lithium ion battery have different tendency of deterioration depending on the battery temperature, and in particular, as the battery temperature is higher, the battery deterioration progresses and the capacity decrease and the internal resistance increase often occur. Therefore, there is a need for technological development to improve the heat dissipation performance of the battery.
　複数のリチウムイオン単電池（以下、単電池と呼ぶ）が組み合わされ、電池群として用いられる場合（例えば、電池モジュール、電池パックとして使用する場合）、電池群中の単電池間の温度差を小さく、さらに電池群の中に存在する電池の最大到達温度が低いことが望まれる。これは、単電池間での温度差が大きく、さらに最大到達温度が高いい場合、単電池間で劣化の差が生じやすいためである。電池群の特性は、電池群に含まれる単電池の中で、最も劣化した電池の特性に律速される傾向があるため、特定の電池が劣化しない電池群の設計が必要となる。 When a plurality of lithium ion cells (hereinafter referred to as cells) are combined and used as a battery group (for example, when used as a battery module or battery pack), the temperature difference between the cells in the battery group is small Furthermore, it is desirable that the maximum ultimate temperature of the batteries present in the battery group be low. This is because when the temperature difference between the unit cells is large and the maximum temperature reached is high, the difference in deterioration is likely to occur between the unit cells. Since the characteristics of the battery group tend to be limited by the characteristics of the most deteriorated battery among the cells included in the battery group, it is necessary to design a battery group in which a specific battery does not deteriorate.
　そこで、複数の単電池が組み合わされて形成された電池群において、様々な電池モジュールの構造が開発されている。例えば特許文献１には、単電池の間に仕切り体を設けて空間を確保している。さらに、筐体（複数の電池を収納するケース）に設けた通気窓より、それら空間を外部に開放し、放熱性を高めている。 Therefore, various battery module structures have been developed in a battery group formed by combining a plurality of unit cells. For example, in Patent Document 1, a partition is provided between the unit cells to secure a space. Furthermore, the space is opened to the outside from the ventilation window provided in the case (the case for storing a plurality of batteries), and the heat dissipation is enhanced.
特開平７－１４２０４６号公報Japanese Patent Application Laid-Open No. Hei 7-142046
　特許文献１に記載される構造では、通気窓は筐体を貫通するため、モジュールの防水性は担保されない。本発明は、前記課題に鑑みてなされたものであり、放熱性と防水性を兼備した電池モジュールを提供する事を目的とする。 In the structure described in Patent Document 1, since the vent window penetrates the housing, waterproofness of the module is not ensured. The present invention is made in view of the above-mentioned subject, and an object of the present invention is to provide a battery module which combines heat dissipation and waterproofness.
　本発明に係る電池モジュールは、上記目的を達成するため、複数の電池セルを積層させた第一の電池群と、複数の電池セルを積層させた第二の電池群と、前記第一の電池群及び第二の電池群を収納する筐体と、を有する電池モジュールにおいて、前記筐体には凹部が設けられ、前記凹部は前記第一の電池群と前記第二の電池群の間に配置されることを特徴とする。 In order to achieve the above object, a battery module according to the present invention includes a first battery group in which a plurality of battery cells are stacked, a second battery group in which a plurality of battery cells are stacked, and the first battery A battery module having a housing for storing a group and a second battery group, wherein the housing is provided with a recess, and the recess is disposed between the first battery group and the second battery group It is characterized by being.
　本発明によれば、筐体に凹部が設け、凹部を第一の電池群と第二の電池群の間に配置することで、放熱性と防水性を兼備した電池モジュールを提供することができる。 According to the present invention, it is possible to provide a battery module having both heat dissipation and waterproof properties by providing a recess in the housing and arranging the recess between the first battery group and the second battery group. .
電池群の構成の一例を説明するための図である。It is a figure for demonstrating an example of a structure of a battery group. 実施例１～７の電池モジュール構成の一例を模式的に示す分解斜視図である。FIG. 21 is an exploded perspective view schematically showing an example of a battery module configuration of Examples 1 to 7. 実施例８～１０の電池モジュール構成の一例を模式的に示す分解斜視図である。FIG. 21 is an exploded perspective view schematically showing an example of a battery module configuration of Examples 8 to 10. 比較例１の電池モジュール構成の一例を模式的に示す分解斜視図である。FIG. 7 is an exploded perspective view schematically showing an example of a battery module configuration of Comparative Example 1; 実施例１～３と、比較例１における電池群の温度上昇比率を比較するグラフである。FIG. 6 is a graph comparing the temperature rise ratio of the battery group in Examples 1 to 3 and Comparative Example 1. FIG. 実施例４～７と、比較例１における電池群の温度上昇比率を比較するグラフである。FIG. 16 is a graph comparing the temperature rise ratio of the battery group in Examples 4 to 7 and Comparative Example 1. FIG. 実施例８～１０と、比較例１における電池群の温度上昇比率を比較するグラフである。FIG. 16 is a graph comparing the temperature rise ratios of the battery groups in Examples 8 to 10 and Comparative Example 1. FIG.
　本発明を実施するための形態について説明する。ただし、本実施形態は以下の内容に何ら制限されるものではなく、本発明の要旨を逸脱しない範囲内で任意に変更して実施可能である。また本発明における冷却環境は例示であり、空気や水以外のその他の冷媒を用いた場合にも適用できる。 A mode for carrying out the present invention will be described. However, the present embodiment is not limited to the following contents at all, and can be implemented with arbitrary modifications without departing from the scope of the present invention. Further, the cooling environment in the present invention is an example, and can be applied to the case of using other refrigerants other than air and water.
　本発明における二次電池には、リチウムイオン二次電池を例示したが、本構成を他の種類の蓄電池に対しても適用できる。またリチウムイオン二次電池の構成部材はどのようなものであっても効果が得られる。つまり本発明では正極としてＡｌ集電箔と層状構造を持つ正極材などからなる電極と、負極としてＣｕ集電箔と炭素材料からなる電極を用いているが、その他の構成でも良い。例えば負極の集電箔にＡｌ箔を用いた場合においても放熱性を向上することが可能である。またリチウムイオン電池の形状として本実施例では角形電池を用いたが、その他の形状として知られる例えばラミネート型、円筒型等電池であっても効果が得られる。 Although the lithium ion secondary battery was illustrated as a secondary battery in this invention, this structure is applicable also to another type of storage battery. In addition, the components of the lithium ion secondary battery can be effectively used regardless of their kind. That is, in the present invention, an electrode made of an Al current collector foil and a positive electrode material having a layered structure is used as a positive electrode, and an electrode made of a Cu current collector foil and a carbon material is used as a negative electrode. For example, also when Al foil is used for the current collection foil of a negative electrode, it is possible to improve heat dissipation. Although a prismatic battery is used in the present embodiment as the shape of the lithium ion battery, the effect can be obtained even if the battery is, for example, a laminate type or cylindrical type battery known as other shapes.
　筐体１５中に含まれる電池群１Ａ、１Ｂの数は、本発明における構成であるように、電池の側面が筐体１５の側面に物理的に熱的に接触することで、電池群１Ａ、１Ｂの側面からの放熱経路が短縮できる限り、いくつであっても良いが、好ましくは電池モジュールの安定性を確保するために偶数がよい。 The number of battery groups 1A and 1B included in the housing 15 is such that the battery side surfaces physically and thermally contact the side surfaces of the housing 15 as in the configuration according to the present invention. Any number may be used as long as the heat radiation path from the side of 1B can be shortened, but preferably an even number is preferable to ensure the stability of the battery module.
　また、電池群１Ａ、１Ｂを構成する電池数は、本発明における構成とすることができ、筐体１５内に収まり、所望の電圧や容量を確保できる限りは、何本としても、本発明における効果が得られる。放熱効果としては、ひとつの電池群１Ａ、１Ｂ中の単電池の積層本数は少なければ少ないほど効果が現れるが、好ましくは１００本以下、より好ましくは２０本以下、最も好ましくは１０本以下である。本発明の実施例のように６本とすることで小型かつ冷却性を兼ね備えた電池とすることができる。 Further, the number of batteries constituting the battery groups 1A and 1B can be the configuration in the present invention, and can be any number as long as a desired voltage and capacity can be secured within the housing 15. An effect is obtained. As the heat radiation effect, the smaller the number of stacked cells in one battery group 1A, 1B, the more effective the effect, but it is preferably 100 or less, more preferably 20 or less, and most preferably 10 or less. . By using six batteries as in the embodiment of the present invention, the battery can be made compact and have both cooling properties.
　さらに、電池群１Ａ、１Ｂ同士の電池数は必ずしも同じでなくても本発明における効果を得る事ができる。例えば電池群のうちの一方の電池数が、他方の電池数に比べて一本以上多い場合も、本発明における効果を得ることができる。 Furthermore, the effects of the present invention can be obtained even if the number of batteries of the battery groups 1A and 1B is not necessarily the same. For example, the effect of the present invention can be obtained even when the number of one battery in the battery group is one or more compared to the number of the other battery.
　また電池群をなす単電池の間に、例えば絶縁性シートや熱伝導性の高い部材を配置しても本発明の効果は得られるし、配置しなくても本発明の効果は得られる。また絶縁性のシートや熱伝導性の高い部材には例えばレール状、点状、など種々の形状の突起や溝などの立体構造を導入しても本発明における効果が得られる。単電池の側面が絶縁材料で被覆されている場合、これらの部材の材料として、アルミニウム、アルミダイカスト、銅、鉄等の熱伝導性の高い材料を用いることができる。また、単電池の側面が、絶縁材料で被覆されていない場合はポリプロピレン、ポリアミド、ポリエーテルイミド、ＰＰＳ、ＰＰＡ、ＰＢＴ等あるいは高熱伝導性樹脂を用いることができる。 Further, the effects of the present invention can be obtained even if, for example, an insulating sheet or a member having high thermal conductivity is disposed between the unit cells forming the battery group, and the effects of the present invention can be obtained even if they are not disposed. Further, the effects of the present invention can be obtained even if a three-dimensional structure such as projections or grooves of various shapes such as a rail shape or a dot shape is introduced to the insulating sheet or the member having high thermal conductivity. When the side surface of the unit cell is covered with an insulating material, a material with high thermal conductivity such as aluminum, aluminum die casting, copper, iron or the like can be used as the material of these members. In addition, when the side surface of the unit cell is not covered with the insulating material, polypropylene, polyamide, polyetherimide, PPS, PPA, PBT or the like, or high thermal conductivity resin can be used.
　また電池群１Ａ、１Ｂは、単電池同士を電気的に直列あるいは並列接続することに加え、固定用の治具を用いて単電池同士を物理的に拘束することが好ましい。固定用の治具の材料には、単電池２の側面が絶縁材料で被覆されている場合、アルミニウム、アルミダイカスト、銅、鉄等の熱伝導性の高い材料を用いることができる。また、単電池２の側面が、絶縁材料で被覆されていない場合はポリプロピレン、ポリアミド、ポリエーテルイミド、ＰＰＳ、ＰＰＡ、ＰＢＴ等あるいは高熱伝導性樹脂を用いることができる。また、拘束の方法には本発明は限定されない。例えば、二つの電池群１Ａ、１Ｂを固定用の治具一セットを用いて束縛した場合でも、固定用の治具２セットを用いて固定した場合でも効果が表れた。また固定用の治具の少なくとも一部が筐体１５であっても本発明における効果が得られた。さらにまた、二つの電池群のある一面は、共通の固定用の治具を用い、その反対面は個別の固定用の治具を用いても効果が得られた。 In addition to electrically connecting the cells in series or in parallel, it is preferable that the cell groups 1A and 1B physically restrain the cells by using a fixing jig. As the material of the fixing jig, when the side surface of the unit cell 2 is covered with the insulating material, a material with high thermal conductivity such as aluminum, aluminum die casting, copper, iron or the like can be used. In addition, when the side surface of the unit cell 2 is not coated with the insulating material, polypropylene, polyamide, polyetherimide, PPS, PPA, PBT or the like, or high thermal conductivity resin can be used. Moreover, the present invention is not limited to the method of restraint. For example, even when the two battery groups 1A and 1B are bound by using one set of fixing jigs, the effect is exhibited even when they are fixed by using two sets of fixing jigs. Further, even if at least a part of the fixing jig is the housing 15, the effect of the present invention is obtained. Furthermore, one side of the two battery groups used a common fixing jig, and the other side had an effect using separate fixing jigs.
　筐体１５と電池群１Ａ、１Ｂなどの各部材の接触方法は特に限定されず、例えば接着剤などによる接着や、ボルトやナットなどの固定器具を介しての接続でも本発明における効果はあらわれる。筐体１５の形状は本実施形態においては凹部１６を有する直方体を例示するが、その形状は特に限定されない。また本発明における効果は電池モジュールへの電流印加条件や冷却条件に限定されない。 The contact method of each member such as the housing 15 and the battery groups 1A and 1B is not particularly limited. For example, the effect of the present invention can be exhibited even by adhesion with an adhesive or connection via a fixing device such as a bolt or a nut. Although the shape of the housing | casing 15 exemplifies the rectangular parallelepiped which has the recessed part 16 in this embodiment, the shape in particular is not limited. Moreover, the effect in the present invention is not limited to the current application condition and the cooling condition to the battery module.
　また、筐体１５に設けた凹部１６にフィンやその他の冷媒を用いたジャケットや配管などの冷却機構を設けても、本発明における構造をとることで効果が得られる。 In addition, even if a cooling mechanism such as a jacket or piping using a fin or other refrigerant is provided in the recess 16 provided in the housing 15, an effect can be obtained by adopting the structure in the present invention.
　筐体１５の種類には例えば、樹脂製筐体や、金属製筐体などが挙げられるが、特に制限されない。好ましくはアルミニウム、アルミダイカスト、銅、鉄等の熱伝導性金属製の筐体１５である事が好ましい。 Examples of the type of the housing 15 include, but are not limited to, a resin housing and a metal housing. Preferably, a casing 15 made of a heat conductive metal such as aluminum, aluminum die cast, copper, iron or the like is preferable.
　また、筐体１５に設けた凹部１６と電池群１Ａ、１Ｂとの熱的接触性を向上させるため、凹部１６と電池群との間に伝熱性のグリスやシートを介してもよい。 Further, in order to improve the thermal contact between the recess 16 provided in the housing 15 and the battery groups 1A and 1B, a heat conductive grease or sheet may be interposed between the recess 16 and the battery group.
　また、本発明は高出力かつ、冷却ファン無しで駆動する４８Ｖ二次電池モジュールの小型化に特に有効である。 In addition, the present invention is particularly effective for miniaturizing a 48V secondary battery module which is driven at high output and without a cooling fan.
　《実施例》
　以下、実施例及び比較例に基づいて、本発明をさらに詳細に説明する。なお、以下説明する場合にｘ方向、ｙ方向、ｚ方向という記載を用いるが、当該方向は各図の左下に記載されている方向と一致するものである。 "Example"
Hereinafter, the present invention will be described in more detail based on examples and comparative examples. In the following description, the descriptions “x direction, y direction, z direction” will be used, but the directions correspond to the directions described at the lower left of each drawing.
　（実施例１）
　本実施例では、正極としてＡｌ集電箔と層状構造を持つ正極材などからなる電極と、負極としてＣｕ集電箔と炭素材料からなる電極を用い、それらの電極を捲回してなる単電池２、６本を図１に記載するように積層させ、その周囲を固定用の固縛治具１３を用いて固定することで電池群１Ａ（１Ｂ）を得た。なお、単電池２は一対の幅広面、一対の幅狭面、底面、および底面と対向する上面からなり、上面には正極端子３と負極端子４が設けられている。また、固縛治具１３は単電池２をｚ方向に固縛する一対の固縛治具１３Ａと、単電池２をｘ方向に固縛する一対の固縛治具１３Ｂからなり、固縛治具１３Ａと固縛治具１３Ｂはそれぞれ固定用金具１２で固定されている。 Example 1
In this embodiment, a unit cell 2 is formed by winding an electrode made of an Al current collector foil and a positive electrode material having a layered structure as a positive electrode, and an electrode made of a Cu current collector foil and a carbon material as a negative electrode. Six batteries were stacked as shown in FIG. 1, and the periphery thereof was fixed using a fixing jig 13 to obtain a battery group 1A (1B). The unit cell 2 includes a pair of wide surfaces, a pair of narrow surfaces, a bottom surface, and an upper surface facing the bottom surface, and a positive electrode terminal 3 and a negative electrode terminal 4 are provided on the upper surface. The securing jig 13 includes a pair of securing jigs 13A for securing the unit cells 2 in the z direction and a pair of securing jigs 13B for securing the unit cells 2 in the x direction. The tool 13A and the securing jig 13B are fixed by the fixing bracket 12, respectively.
　図２は図１に示す電池群１Ａ、１Ｂを収納した電池モジュール１０を示すものである。上述した電池群１Ａ（１Ｂ）は筐体１５に収納される。この筐体１５は電池群１Ａ、１Ｂの放熱性を向上させるために、凹部が設けられており、この凹部１６が電池群１Ａ、１Ｂのそれぞれの側面部に密着するような構成になっている。また、電池群１Ａ、１Ｂが収納された空間と対向する空間には電装品を配置するスペース１４が設けられており、この空間に単電池２の充放電を管理する回路基板やヒューズ、機械スイッチといった電池パック１０の安全性を確保する電装品が配置されることになる。電池群１Ａ、１Ｂ及び電装品が収納されたのちに筐体１５の開口が蓋１１によって覆われて電池モジュール１０が構成されることとなる。 FIG. 2 shows a battery module 10 containing the battery groups 1A and 1B shown in FIG. The battery group 1A (1B) described above is housed in the housing 15. In order to improve the heat dissipation of the battery groups 1A and 1B, the housing 15 is provided with a recess, and the recess 16 is in close contact with the side surfaces of the battery groups 1A and 1B. . In addition, a space 14 for arranging electrical components is provided in a space facing the space in which the battery groups 1A and 1B are stored. A circuit board, a fuse, and a mechanical switch for managing charge and discharge of the unit cell 2 are provided in this space. Electrical components that ensure the safety of the battery pack 10 are disposed. After the battery groups 1A and 1B and the electrical components are stored, the opening of the housing 15 is covered by the lid 11 to constitute the battery module 10.
　本発明の実施例１ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さを、電池群のｙ方向長さの１００％とした。 In Example 1 of the present invention, the length of the recess in the recess 16 in the depth direction (y direction) is set to 100% of the length in the y direction of the battery group.
　この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例２）
　続いて実施例２について説明する。実施例２ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さを５０％とした。この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 (Example 2)
Subsequently, Example 2 will be described. In the second embodiment, the length of the recess in the recess 16 in the depth direction (y direction) is 50%. A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例３）
　続いて実施例３について説明する。実施例３ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さを２５％とした。この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 (Example 3)
Subsequently, the third embodiment will be described. In the third embodiment, the length of the recess in the recess 16 in the depth direction (y direction) is 25%. A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例４）
　続いて実施例４について説明する。実施例４ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さは１００％とし、凹部の幅（ｘ方向）をそれぞれ筐体のｘ方向サイズの１．７％とした。この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 (Example 4)
Subsequently, the fourth embodiment will be described. In Example 4, the length in the depth direction (y direction) of the recess in the recess 16 is 100%, and the width (x direction) of the recess is 1.7% of the size in the x direction of the housing. A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例５）
　続いて実施例５について説明する。実施例５ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さは１００％とし、凹部の幅（ｘ方向）をそれぞれ筐体のｘ方向サイズの３．３％とした。この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 (Example 5)
Subsequently, the fifth embodiment will be described. In Example 5, the length in the depth direction (y direction) of the recess of the recess 16 is 100%, and the width (x direction) of the recess is 3.3% of the size in the x direction of the housing. A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例６）
　続いて実施例５について説明する。実施例５ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さは１００％とし、凹部の幅（ｘ方向）をそれぞれ筐体のｘ方向サイズの６．７％とした。この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 (Example 6)
Subsequently, the fifth embodiment will be described. In Example 5, the length in the depth direction (y direction) of the recess in the recess 16 is 100%, and the width (x direction) of the recess is 6.7% of the size in the x direction of the housing. A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例７）
　続いて実施例５について説明する。実施例５ではこの凹部１６の凹みの深さ方向（ｙ方向）の長さは１００％とし、凹部の幅（ｘ方向）をそれぞれ筐体のｘ方向サイズの１０．０％とした。この電池モジュール１０に対して電流を印加してその温度上昇を測定した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例では、前記条件を電池モジュールに与えた後、ほぼ定常状態となった際の温度挙動を図５に示す。 (Example 7)
Subsequently, the fifth embodiment will be described. In Example 5, the length in the depth direction (y direction) of the recess in the recess 16 is 100%, and the width (x direction) of the recess is 10.0% of the size in the x direction of the housing. A current was applied to the battery module 10 and the temperature rise was measured. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. In the present embodiment, the temperature behavior at the time when the battery module is brought into a substantially steady state after the above conditions are given to the battery module is shown in FIG.
　（実施例８）
　続いて実施例８について説明する。実施例８が実施例１と異なる点は、図３に示すように凹部１６の周りに液冷パイプ１７を設けた点である。液冷パイプの幅（ｙ方向）の長さは、電池群１Ａ、１Ｂのｙ方向長さの１００％とした。 (Example 8)
Subsequently, an eighth embodiment will be described. The eighth embodiment differs from the first embodiment in that a liquid cooling pipe 17 is provided around the recess 16 as shown in FIG. The length of the width (y direction) of the liquid cooling pipe was 100% of the length of the battery groups 1A and 1B in the y direction.
　この電池モジュール２０に対して電流を印加した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例は、前記構成の電池に対して、実施例１～３と同様の電流印加条件および周囲の冷却環境を与え、ほぼ定常状態となった際の結果を図７に示す。 A current was applied to the battery module 20. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. The present example gives the same current application conditions and surrounding cooling environment as the examples 1 to 3 to the battery of the above configuration, and the result when the battery is in a substantially steady state is shown in FIG.
　（実施例９）
　続いて実施例９について説明する。実施例９が実施例８と異なる点は、液冷パイプの幅（ｙ方向）の長さは、電池群１Ａ、１Ｂのｙ方向長さの５０％とした点である。 (Example 9)
Subsequently, Example 9 will be described. Example 9 differs from Example 8 in that the length of the width (y direction) of the liquid-cooled pipe is 50% of the length of the battery groups 1A and 1B in the y direction.
　この電池モジュール２０に対して電流を印加した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例は、前記構成の電池に対して、実施例１～３と同様の電流印加条件および周囲の冷却環境を与え、ほぼ定常状態となった際の結果を図７に示す。 A current was applied to the battery module 20. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. The present example gives the same current application conditions and surrounding cooling environment as the examples 1 to 3 to the battery of the above configuration, and the result when the battery is in a substantially steady state is shown in FIG.
　（実施例１０）
　続いて実施例１０について説明する。実施例１０が実施例８と異なる点は、液冷パイプの幅（ｙ方向）の長さは、電池群１Ａ、１Ｂのｙ方向長さの２５％とした点である。 (Example 10)
Subsequently, the tenth embodiment will be described. Example 10 differs from Example 8 in that the length of the width (y direction) of the liquid-cooled pipe is 25% of the length in the y direction of the battery groups 1A and 1B.
　この電池モジュール２０に対して電流を印加した。この際、空気の流れの無い恒温槽中での試験結果とした。なお電池からの発熱量は電流値から計算して平均３．３７Ｗとなるように電流値を印加した。本実施例は、前記構成の電池に対して、実施例１～３と同様の電流印加条件および周囲の冷却環境を与え、ほぼ定常状態となった際の結果を図７に示す。 A current was applied to the battery module 20. Under the present circumstances, it was set as the test result in a thermostat without a flow of air. The calorific value from the battery was calculated from the current value, and the current value was applied so as to be 3.37 W on average. The present example gives the same current application conditions and surrounding cooling environment as the examples 1 to 3 to the battery of the above configuration, and the result when the battery is in a substantially steady state is shown in FIG.
　（比較例１）
　比較例１では、正極としてＡｌ集電箔と層状構造を持つ正極材などからなる電極と、負極としてＡｌ集電箔とスピネル系酸化物からなる電極を用い、それらの電極を捲回してなる単電池２、６本を図１に記載するように積層させ、その周囲を固定用の加圧治具を用いて固定することで電池群を得た。本比較例ではこれらの電池群１Ａ、１Ｂの間にセンタブロック１８を設け、筐体１５に格納した。本比較例は、前記構成の電池に対して、実施例１～３と同様の電流印加条件および周囲の冷却環境を与え、ほぼ定常状態となった際の結果を例示する。 (Comparative example 1)
In Comparative Example 1, an electrode made of an Al current collector foil and a positive electrode material having a layered structure as a positive electrode, and an electrode made of an Al current collector foil and a spinel oxide as a negative electrode are single electrodes formed by winding those electrodes. The batteries 2 and 6 were stacked as described in FIG. 1, and the periphery was fixed using a fixing pressure jig to obtain a battery group. In the present comparative example, the center block 18 is provided between the battery groups 1A and 1B and stored in the housing 15. The present comparative example gives the battery of the above-described configuration the same current application conditions and surrounding cooling environment as in Examples 1 to 3, and exemplifies the results when the battery is in a substantially steady state.
　＜実施例１～１０及び比較例１の二次電池モジュールの電池温度の評価結果＞
　以下に各図の結果について詳細に説明する。 <Evaluation Results of Battery Temperature of Secondary Battery Modules of Examples 1 to 10 and Comparative Example 1>
The results of each figure will be described in detail below.
　図５には比較例１とともに、本発明を適用した例であり、縦軸に単電池の温度上昇率を記載し、横軸に単電池２のセル番号を記載したものである。なおセル番号は図１に記載したものである。また、電池群１Ａ、１Ｂともの同様の挙動を示しているため、電池群１Ａの結果を載せたものである。 FIG. 5 is an example to which the present invention is applied together with Comparative Example 1, in which the temperature rise rate of the unit cell is described on the vertical axis, and the cell number of the unit cell 2 is described on the horizontal axis. The cell numbers are as shown in FIG. Moreover, since the behavior similar to that of the battery groups 1A and 1B is shown, the result of the battery group 1A is added.
　実施例１、２，３の温度上昇比率を示す。温度上昇比率とは、比較例１における電池セルの最大温度を１００％とした際のその他電池セルの温度上昇を比率で示すものである。温度上昇比率＝（評価対象電池セルの温度／比較例１における電池セルの最大温度）×１００である。 The temperature rise ratio of Example 1, 2 and 3 is shown. The temperature rise ratio indicates the temperature rise of the other battery cells when the maximum temperature of the battery cells in Comparative Example 1 is 100%. Temperature rise ratio = (temperature of evaluation target battery cell / maximum temperature of battery cell in comparative example 1) × 100.
　比較例１では、凹部１６（放熱空間）を設けておらず、図４に示したように２つの電池群１Ａ、１Ｂの間には、センタブロック１８を設置した。なお、実施例１、２、３においては、凹部の凹みの深さ方向（ｙ方向）の長さをそれぞれ電池群１Ａ（１Ｂ）のｙ方向長さの１００％、５０％、２５％としたが凹部の幅は、筐体のｘ方向の長さの約３．３％と一定にている。図５のグラフに示すように比較例１に比べ、放熱可能な凹部が設けた実施例１～３の温度上昇比率が低いことが分かる。充放電時の発熱が凹部から放熱されたためである。この結果は、筐体１５に凹部１６を設けることが空冷方式で非常にに有効である事を示している。さらに、凹部と電池群との接触面積が広いほど、空冷に有効である事を示す。 In the comparative example 1, the recessed part 16 (heat radiation space) was not provided, but as shown in FIG. 4, the center block 18 was installed between two battery group 1A, 1B. In Examples 1, 2, and 3, the length in the depth direction (y direction) of the recess of the recess is 100%, 50%, and 25% of the length in the y direction of battery group 1A (1B), respectively. The width of the recess is constant at about 3.3% of the length of the housing in the x direction. As shown in the graph of FIG. 5, it can be seen that the temperature increase ratio of Examples 1 to 3 in which the heat dissipating concave portion is provided is lower than that of Comparative Example 1. This is because the heat generated during charge and discharge is dissipated from the recess. This result indicates that providing the recess 16 in the housing 15 is very effective in the air cooling method. Furthermore, the larger the contact area between the recess and the battery group, the more effective it is for air cooling.
　また、比較例１および実施例１～３において、セル番号３，４の温度上昇比率が同電池モジュールの他電池セルの温度上昇比率に比べ、高いことが分かる。セル番号３，４は、それぞれの電池群の中心に位置し、伝熱経路が長く放熱性が低いためである。 Further, in Comparative Example 1 and Examples 1 to 3, it can be seen that the temperature increase ratio of cell numbers 3 and 4 is higher than the temperature increase ratio of the other battery cells of the same battery module. The cell numbers 3 and 4 are located at the centers of the respective battery groups, and the heat transfer path is long and the heat dissipation is low.
　図６には比較例１とともに、本発明を適用した例である、実施例４～７の温度上昇比率を示す。なお、実施例４～７においては、凹部の凹みの深さ方向（ｙ方向）の長さを電池群１Ａ（１Ｂ）のｙ方向長さの１００％と一定にし、凹部の幅（ｘ方向）をそれぞれ筐体１５のｘ方向サイズの１．７％、３．３％、６．７％、１０．０％とした。比較例１に比べ、放熱可能な凹部が設けた実施例４～７の温度上昇比率が低いことが分かる。充放電時の発熱が凹部から放熱されたためである。この結果は、筐体に凹部を設けることが空冷に有効である事を示す。さらに、実施例４～７は、異なる凹部の幅を有し、温度上昇比率も異なることが分かる。凹部の幅は、その幅の同方向の筐体サイズの１．７％以上が望ましく、より望ましくは３．３％以上１０％以下がより好ましい。なお、筐体のサイズが限定される場合に凹部の幅が広すぎると、筐体の伝熱面積自体が減少するため実施例１～３よりも温度上昇率が高かったものと考えられる。 FIG. 6 shows the temperature increase ratio of Examples 4 to 7 which is an example to which the present invention is applied together with Comparative Example 1. In Examples 4 to 7, the length in the depth direction (y direction) of the recess of the recess is set to 100% of the length in the y direction of the battery group 1A (1B), and the width of the recess (x direction) Of 1.7%, 3.3%, 6.7%, and 10.0% of the size of the housing 15 in the x direction, respectively. It can be seen that the temperature rise ratio of Examples 4 to 7 in which the heat dissipating concave portion is provided is lower than that of Comparative Example 1. This is because the heat generated during charge and discharge is dissipated from the recess. This result indicates that providing a recess in the case is effective for air cooling. Furthermore, it can be seen that Examples 4 to 7 have different recess widths, and the temperature rise rates are also different. The width of the recess is preferably 1.7% or more, and more preferably 3.3% or more and 10% or less of the housing size in the same direction of the width. It should be noted that when the size of the case is limited, if the width of the recess is too wide, the heat transfer area of the case itself decreases, so it is considered that the temperature rise rate is higher than in Examples 1 to 3.
　最後に図７には比較例１とともに、本発明を適用した例である、実施例８～１０の温度上昇比率を示す。このように冷却パイプ１７を用いた場合には冷却効率が向上し、より効果が高くなることがわかる。 Finally, FIG. 7 shows the temperature increase ratio of Examples 8 to 10 which is an example to which the present invention is applied together with Comparative Example 1. As described above, when the cooling pipe 17 is used, the cooling efficiency is improved, and the effect is enhanced.
　以上、本発明についてまとめる。 The present invention is summarized as above.
　本発明に記載の電池モジュールは、複数の電池セル（２）を積層させた第一の電池群（１Ａ）と、複数の電池セル（２）を積層させた第二の電池群（１Ｂ）と、第一の電池群（１Ａ）及び第二の電池群（１Ｂ）を収納する筐体（１５）と、を有し、筐体（１５）には凹部（１６）が設けられ、凹部（１６）は第一の電池群（１Ａ）と第二の電池群（１Ｂ）の間に配置される。このような構造にすることによって、従来放熱性が悪かった電池群間を直接外気や冷却パイプ１７と接触させる構成とできるため、電池モジュールの防水性を確保しつつつも放熱性が向上する。また、冷却パイプ１７を用いない構成では電池モジュールを大型化させることなく、小型で冷却性能が高い電池モジュールを提供することができる。さらに筐体１５の凹部が電装品を配置するスペースに対向して配置される構成となっているため、従来の電池モジュールよりも放熱性が向上するだけでなく、ｙ方向の圧壊に対して強い構造となる。なお、ｘ方向、ｚ方向については固い電池群１Ａ、１Ｂが配置されているため、圧壊については強くなっている。 The battery module according to the present invention includes a first battery group (1A) in which a plurality of battery cells (2) are stacked, and a second battery group (1B) in which a plurality of battery cells (2) are stacked. A housing (15) for housing the first battery group (1A) and the second battery group (1B), the housing (15) being provided with a recess (16), the recess (16) ) Are disposed between the first battery group (1A) and the second battery group (1B). With such a structure, the battery group having a poor heat dissipation property can be directly brought into contact with the outside air or the cooling pipe 17. Therefore, the heat dissipation property is improved while securing the waterproofness of the battery module. Further, in the configuration in which the cooling pipe 17 is not used, it is possible to provide a small-sized battery module with high cooling performance without increasing the size of the battery module. Furthermore, since the recess of the housing 15 is arranged to face the space where the electrical components are arranged, not only the heat dissipation is improved compared to the conventional battery module, but it is more resistant to crushing in the y direction. It becomes a structure. In addition, since the hard battery groups 1A and 1B are disposed in the x direction and the z direction, crushing is strong.
　また、上記では記載しなかったが凹部１６にはフィンが設けられていてもよい。このような構造にすることによって、より電池群の放熱性が向上する。また、上述したように凹部１６には冷却パイプ１７が設けられているとより放熱性が向上する。 Further, although not described above, fins may be provided in the recess 16. With such a structure, the heat dissipation of the battery group is further improved. Further, as described above, when the cooling pipe 17 is provided in the recess 16, the heat dissipation is further improved.
　また、上記では記載しなかったが凹部１６には筐体１５よりも放熱性の良い放熱部材が配置されていてもよい。ここでいう放熱性の良い部材とは例えば樹脂にフィラーが練り込んである部材や、放熱性のより良い金属部材などである。 Moreover, although not described above, a heat dissipation member having better heat dissipation than the housing 15 may be disposed in the recess 16. The member having a good heat dissipation property referred to here is, for example, a member in which a filler is kneaded into a resin, or a metal member having a better heat dissipation property.
　また、本発明に記載の電池モジュールでは、複数の電池セルを固縛する固縛板を有し、固縛板（１３）は、第一の電池群に対応する第一の固縛板（１３）と、第二の電池群に対応する第二の固縛板（１３）とを有する構造となっている。このような構造にすることによって、各電池群の密着性を上げて放熱性をよくすることができる。 Further, in the battery module according to the present invention, the battery module includes the securing plate for securing the plurality of battery cells, and the securing plate (13) is a first securing plate (13) corresponding to the first battery group. And a second securing plate (13) corresponding to the second battery group. With such a structure, the adhesion of each battery group can be increased to improve the heat dissipation.
　また、本発明に記載の電池モジュールでは凹部の幅は筐体（１５）の幅の１．７％以上である。このような構成にすることによってより高い放熱効果を得ることができる。
以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。 Moreover, in the battery module according to the present invention, the width of the recess is 1.7% or more of the width of the housing (15). With such a configuration, a higher heat dissipation effect can be obtained.
As mentioned above, although the embodiment of the present invention was explained in full detail, the present invention is not limited to the above-mentioned embodiment, and various designs are possible in the range which does not deviate from the spirit of the present invention described in the claim. It is possible to make changes. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to one having all the described configurations. Further, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Furthermore, with respect to a part of the configuration of each embodiment, it is possible to add / delete / replace other configurations.
１、１Ａ、１Ｂ　電池群
２　単電池
３　正極端子
４　負極端子
１０、２０、３０　電池モジュール
１１　蓋
１２　固定用金具
１３　固縛治具
１４　電装品配置スペース
１５　筐体
１６　凹部（放熱空間）
１７　冷却パイプ
１８　センタブロック DESCRIPTION OF SYMBOLS 1, 1A, 1B Battery group 2 Cell 3 Positive electrode terminal 4 Negative electrode terminal 10, 20, 30 Battery module 11 Lid 12 Fixing bracket 13 Fastening jig 14 Electric component arrangement space 15 Housing 16 Concave part (heat radiation space)
17 Cooling pipe 18 Center block

Claims (6)

  1. 　複数の電池セルを積層させた第一の電池群と、
    　複数の電池セルを積層させた第二の電池群と、
    　前記第一の電池群及び第二の電池群を収納する筐体と、を有する電池モジュールにおいて、
    　前記筐体には凹部が設けられ、前記凹部は前記第一の電池群と前記第二の電池群の間に配置されることを特徴とする電池モジュール。     A first battery group in which a plurality of battery cells are stacked,
    A second battery group in which a plurality of battery cells are stacked,
    In a battery module having a housing for housing the first battery group and the second battery group,
    A battery module, wherein the housing is provided with a recess, and the recess is disposed between the first battery group and the second battery group.
  2. 　請求項１に記載の電池モジュールにおいて、
    　前記電池群を固縛する固縛板を有し、
    　前記固縛板は、前記第一の電池群に対応する第一の固縛板と、前記第二の電池群に対応する第二の固縛板とを有することを特徴とする電池モジュール。     In the battery module according to claim 1,
    A securing plate for securing the battery group;
    A battery module comprising: a first fastening plate corresponding to the first battery group; and a second fastening plate corresponding to the second battery group.
  3. 　請求項１または２に記載の電池モジュールにおいて、
    　前記凹部にはフィンが設けられることを特徴とする電池モジュール。     In the battery module according to claim 1 or 2,
    The said recessed part is provided with a fin, The battery module characterized by the above-mentioned.
  4. 　請求項１または２に記載の電池モジュールにおいて、
    　前記凹部には冷却パイプが設けられることを特徴とする電池モジュール。     In the battery module according to claim 1 or 2,
    A battery module characterized in that a cooling pipe is provided in the recess.
  5. 　請求項１または２に記載の電池モジュールにおいて、
    　前記凹部には前記筐体よりも放熱性の良い放熱部材が配置されることを特徴とする電池モジュール。     In the battery module according to claim 1 or 2,
    A battery module characterized in that a heat dissipating member having better heat dissipation than the casing is disposed in the recess.
  6. 　請求項１または２に記載の電池モジュールにおいて、
    　前記凹部の幅は前記筐体の幅の１．７％以上であることを特徴とする電池モジュール。     In the battery module according to claim 1 or 2,
    The width | variety of the said recessed part is 1.7% or more of the width | variety of the said housing | casing, The battery module characterized by the above-mentioned.
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US20160211086A1 (en) * 2015-01-15 2016-07-21 Ioxus, Inc. Apparatus for enclosing energy storage devices
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