WO2015174165A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
- Publication number
- WO2015174165A1 WO2015174165A1 PCT/JP2015/060757 JP2015060757W WO2015174165A1 WO 2015174165 A1 WO2015174165 A1 WO 2015174165A1 JP 2015060757 W JP2015060757 W JP 2015060757W WO 2015174165 A1 WO2015174165 A1 WO 2015174165A1
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- Prior art keywords
- terminal
- case
- seal
- wall
- space
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- 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
- H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
- H01G11/16—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against electric overloads, e.g. including fuses
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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
- H01G11/74—Terminals, e.g. extensions of current collectors
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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
- H01G11/80—Gaskets; Sealings
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- H01M50/50—Current conducting connections for cells or batteries
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- H01M50/50—Current conducting connections for cells or batteries
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- H01M50/574—Devices or arrangements for the interruption of current
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- H—ELECTRICITY
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- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the technology disclosed in the present specification relates to a power storage device provided with a current interrupting device.
- Japanese Unexamined Patent Publication No. 2012-38529 discloses a current interrupting device in which a current-carrying plate connected to a current collection tab and a deformation plate connected to a terminal are joined. When the pressure in the case of the power storage device rises and exceeds a predetermined value, the current interrupting device operates and the deformation plate separates from the current-carrying plate. As a result, the current between the terminal and the plate is cut off.
- the terminal is fixed to the opening formed in the terminal wall of the case.
- An insulating seal member and an insulating member are disposed between the terminal and the terminal wall.
- the seal member is in contact with the terminal and the terminal wall to seal between the two.
- the insulating member is disposed at a distance from the seal member on the inner side of the case relative to the seal member. For this reason, a space is formed between the seal member and the insulating member. In the space, the terminal and the terminal wall directly face each other.
- the electrolytic solution in the case may enter the space along the gap between the insulating member and the terminal and / or the insulating member and the terminal wall.
- the present specification provides a technique for suppressing a short circuit between a terminal and a terminal wall.
- a power storage device disclosed in the present specification includes a case, a terminal, and a current interrupting device.
- the case can accommodate an electrode assembly including a positive electrode and a negative electrode, and an electrolyte.
- the terminal communicates with the inside and the outside of the case through an opening formed in the terminal wall of the case.
- the current interrupting device is housed in the case and electrically connected to the terminal and the positive electrode, or the terminal and the negative electrode, and switches the terminal and the positive electrode or the negative electrode from the conductive state to the non-conductive state. It has a conductive member.
- the terminal has a columnar portion inserted through the opening, and a base portion disposed at one end of the columnar portion and positioned inside the case.
- the base portion is larger than the opening in a plan view of the terminal wall, and is electrically connected to the conductive member.
- an insulating first seal member having a first seal portion that seals between the terminal and the terminal wall by being in contact with both the terminal and the terminal wall is disposed.
- the first seal member makes a circuit around the columnar portion.
- An insulating first insulating member is disposed around the periphery of the columnar portion in the first space on the case inner side of the first seal portion in the space between the terminal and the terminal wall. In the first space, at least one of the first seal member and the first insulating member is disposed from the end face on the case exterior side of the first space to the end face on the case interior side.
- the first seal portion of the first seal member seals between the terminal and the terminal wall. For this reason, it is suppressed that the electrolyte solution in a case leaks to space outside a case rather than a 1st seal
- at least one of the first seal member and the first insulating member is disposed in the first space on the case inner side of the first seal portion in the space between the terminal and the terminal wall.
- the terminal and the terminal wall do not directly face each other. Therefore, even if a high voltage is applied between the terminal and the terminal wall after the operation of the current interrupting device, short circuit between the terminal and the terminal wall can be suppressed.
- the “inside of the case” refers to the direction from the outside to the inside of the case in the space connecting the outside and the inside of the case
- the “outside of the case” refers to the space connecting the outside of the case to the inside. Represents the direction from the inside to the outside of the case. Therefore, when the space between the terminal wall and the terminal (the space connecting the inside and the outside of the case) extends in the case parallel to the terminal wall, the direction away from the opening of the terminal wall is the “case inside side” The direction close to the opening is the “case outer side”.
- “opposite” indicates a state in which two members face each other at an interval
- "contact” indicates a state in which two members are in contact.
- a power storage device disclosed in the present specification includes a case, a terminal, and a current interrupting device.
- the case can accommodate an electrode assembly including a positive electrode and a negative electrode, and an electrolyte.
- the terminal communicates with the inside and the outside of the case through an opening formed in the terminal wall of the case.
- the current interrupting device is housed in the case and electrically connected to the terminal and the positive electrode, or the terminal and the negative electrode, and switches the terminal and the positive electrode or the negative electrode from the conductive state to the non-conductive state. It has a conductive member.
- the terminal has a columnar portion inserted through the opening, and a base portion disposed at one end of the columnar portion and positioned inside the case.
- the base portion is larger than the opening in a plan view of the terminal wall, and is electrically connected to the conductive member.
- an insulating second seal member having a third seal portion that seals between the terminal and the terminal wall by being in contact with both the terminal and the terminal wall is disposed.
- the second seal member makes a circuit around the columnar portion.
- An insulating second insulating member is disposed in the space between the terminal and the terminal wall, in the second space on the case inner side of the third seal portion, around the circumference of the columnar portion.
- An insulating third seal member having a fourth seal portion which goes around the circumference of the columnar portion is disposed.
- at least one of a second seal member, a third seal member, and a second insulating member is disposed from an end face on the case outer side of the second space to an end face on the case inner side.
- the second seal member, the third seal member, and the second insulating member are provided in the second space on the case inner side of the third seal portion in the space between the terminal and the terminal wall.
- the terminal and the terminal wall do not directly face each other, and short circuit between the terminal and the terminal wall can be suppressed.
- the fourth seal portion of the third seal member is closer to the inside of the case than the third seal portion of the second seal member, and between the terminal wall and one of the terminals and the second insulating member It is sealed. For this reason, it is suppressed that the electrolyte solution in a case leaks to the case exterior side rather than a 4th seal
- the contact between the terminal and the terminal wall via the electrolytic solution is suppressed in the space outside the case and the short circuit between the terminal and the terminal wall is further suppressed. it can.
- the third seal portion of the second sealing member causes the electrolyte to flow. Leakage to a space outside the case than the third seal portion is suppressed.
- FIG. 1 is a longitudinal sectional view of a power storage device of Example 1.
- FIG. The elements on larger scale of the caulking terminal vicinity which comprises the negative electrode terminal of FIG. The elements on larger scale of the caulking terminal vicinity which comprise the negative electrode terminal of the electrical storage apparatus of Example 2.
- FIG. 15 is a partial enlarged view of the vicinity of the negative electrode terminal of the power storage device of Example 4.
- FIG. 1 is a longitudinal sectional view of a power storage device of Example 1.
- FIG. The elements on larger scale of the caulking terminal vicinity which comprises the negative electrode terminal of FIG. The elements on larger scale of the caulking terminal vicinity which comprise the negative electrode terminal of the electrical storage apparatus of Example 2.
- FIG. 15 is a partial enlarged
- the first seal member contacts both the terminal wall and one of the terminals and the first insulating member in a space where the terminal wall and one of the terminals and the first insulating member face each other. It is also possible to have a second seal portion that seals between the first insulating member and one of the terminal wall and the terminal. According to this configuration, the second seal portion seals the space between the first insulating member and the terminal wall since the space between the first insulating member and the terminal wall is sealed between the first insulating member and the terminal wall; Contact between the first insulating member and the terminal and the electrolyte flowing to the outside of the case is suppressed. For this reason, it is suppressed that a terminal and a terminal wall contact via electrolyte solution in 1st space, and a short circuit with a terminal and a terminal wall can be suppressed more.
- the first insulating member, the terminal wall, and at least one of the terminals protrude toward the first seal member.
- the first protrusion may be formed.
- the first protrusion may be in contact with the first seal member.
- the terminal can be relatively easily fixed to the terminal wall while increasing the sealing force between the terminal wall and one of the terminals and the first insulating member.
- the terminal or the terminal wall is provided on one side of the terminal or the terminal wall in the area where the terminal and the terminal wall overlap in the area occupied by the first seal portion when the terminal wall is viewed in plan.
- a second protrusion may be formed extending toward the other.
- the second protrusion may be in contact with the first seal member. According to this configuration, the sealing force of the first seal portion is increased at the portion where the second projection abuts. Therefore, compared to the configuration in which the second protrusion is not formed, leakage of the electrolytic solution to the space outside the case can be further suppressed.
- the terminal can be relatively easily fixed to the terminal wall while increasing the sealing force between the terminal and the terminal wall.
- the first seal member is a space in which the first insulating member and the terminal wall or the terminal face each other with both the first insulating member and the terminal wall or the terminal. It may have a 2nd seal part which seals between the 1st insulating member and a terminal wall or a terminal by contacting. In a range occupied by the second seal portion, at least one of the first insulating member, the terminal wall, and the terminal may be formed with a first protrusion projecting toward the first seal member. The first protrusion may be in contact with the first seal member.
- the compression ratio of the first seal member at a portion of the first protrusion and the second protrusion in contact with one of the protrusions adjacent to the columnar portion of the terminal corresponds to the other protrusion spaced from the columnar portion. It may be larger than the compression rate of the first seal member at the contacting portion.
- the repulsive force of the first seal member at the time of fixing the terminal to the terminal wall becomes smaller as it approaches the columnar portion if the compression ratio of the first seal member at the time of fixing the terminal is the same. Therefore, it is possible to increase the sealing force at the portion of the protrusion close to the columnar portion while suppressing the increase in the repulsive force of the first seal member at the time of fixing the terminal.
- the terminal is connected on the side opposite to the side to which the base portion is connected of the columnar portion, and the terminal is located outside the case and is axially straight from the opposite side of the columnar portion. It may have a fixing part which is bent outward in the direction to fix the terminal to the terminal wall.
- the first seal portion or the third seal portion may be located in a range in which the terminal and the terminal wall overlap in a state where the terminal wall is viewed in plan, and in a range occupied by the fixing portion. According to this configuration, when the terminal is fixed to the terminal wall, the direction of the load exerted by the fixing portion on the terminal wall is the same as the direction of the compressive force for sealing the terminal and the terminal wall.
- the third seal portion can seal tightly between the terminal and the terminal wall.
- the terminal may be clamped and fixed to the terminal wall by a nut located outside the case.
- the first seal portion or the third seal portion may be located in a range in which the terminal and the terminal wall overlap in a state where the terminal wall is viewed in plan, and in a range occupied by the nut. According to this configuration, when the terminal is tightened and fixed to the terminal wall, the direction of the tightening force exerted by the nut on the terminal wall is the same as the direction of the compressive force for sealing the terminal and the terminal wall.
- the third seal portion can seal tightly between the terminal and the terminal wall.
- the present specification discloses a power storage device module including a plurality of the power storage devices described above, and the plurality of power storage devices being connected in series.
- the storage device module is configured such that the terminals and the terminal wall do not directly face each other in the first space or the second space of each storage device constituting the storage device module. Therefore, even if a high voltage is applied between the terminal and the terminal wall after the operation of the current interrupting device, short circuit between the terminal and the terminal wall can be suppressed.
- Power storage device 100 is a lithium ion secondary battery which is a type of secondary battery.
- the power storage device 100 includes a case 1, an electrode assembly 3, caulking terminals 5 and 7, and a current interrupting device 30.
- Case 1 is made of metal and has a substantially rectangular parallelepiped shape.
- An electrode assembly 3 and a current interrupting device 30 are accommodated in the case 1.
- the electrode assembly 3 includes a negative electrode and a positive electrode.
- the negative electrode current collection tab 43 is fixed to the negative electrode, and the positive electrode current collection tab 45 is fixed to the positive electrode.
- An electrolytic solution is injected into the case 1.
- the caulking terminal 5 corresponds to an example of the “terminal”.
- Openings 11 and 13 are formed in the case 1.
- the wall in which the openings 11 and 13 are formed is particularly referred to as a case upper wall 9. That is, the side where the case upper wall 9 is located with respect to the electrode assembly 3 is the upper side, and the side opposite to the side where the case upper wall 9 is located with respect to the electrode assembly 3 is the lower side.
- the caulking terminal 5 communicates with the inside and outside of the case 1 through the opening 11, and the caulking terminal 7 communicates with the inside and outside of the case 1 through the opening 13.
- the lower end of the caulking terminal 5 is located inside the case 1 and is connected to a current interrupting device 30 (described later).
- the current interrupting device 30 is connected to the negative electrode current collection tab 43 via the connection terminal 23 and the negative electrode lead 25.
- the negative electrode lead 25 is insulated from the case upper wall 9 by the insulating sheet 27.
- the lower end of the caulking terminal 7 is located inside the case 1 and is connected to the positive electrode current collection tab 45 via the positive electrode lead 41.
- the positive electrode lead 41 is insulated from the case upper wall 9 by the insulating sheet 29.
- the case upper wall 9 corresponds to an example of the “terminal wall”.
- Gaskets 62 and 63 made of resin are disposed on the upper surface of the case upper wall 9.
- the gasket 62 has a protrusion 66 projecting upward from the case top wall 9 and a flat portion 68 extending along the case top wall 9.
- the projecting portion 66 is disposed on the center side of the case upper wall 9, and the flat plate portion 68 is disposed on the opening 11 side of the case upper wall 9.
- An external terminal 60 is disposed on the top surface of the gasket 62 along the shape of the top surface of the gasket 62.
- the head of the bolt 64 is disposed in a bottomed hole 62 a formed in the projection 66.
- the shaft portion of the bolt 64 protrudes upward through the opening of the external terminal 60.
- the caulking terminal 5, the external terminal 60, and the bolt 64 are electrically connected to one another to constitute a negative electrode terminal.
- the configurations of the gasket 63, the external terminal 61 and the bolt 65 are the same as the configurations of the gasket 62, the external terminal 60 and the bolt 64 described above.
- the caulking terminal 7, the external terminal 61, and the bolt 65 are electrically connected to one another to constitute a positive electrode terminal.
- FIG. 2 shows an enlarged view of a two-dot chain line portion 200a of FIG.
- the caulking terminal 5 has a cylindrical portion 14, a base portion 15 and a fixing portion 16.
- the cylindrical portion 14 has a cylindrical shape and is inserted into the opening 11.
- a through hole 14 a is formed in the cylindrical portion 14 in the axial direction (vertical direction). Therefore, the inside of the through hole 14a is maintained at atmospheric pressure.
- the base portion 15 is formed in an annular shape, and is disposed at the lower end of the cylindrical portion 14. That is, the base 15 is located inside the case 1.
- the upper surface of the base portion 15 is substantially orthogonal to the axial direction of the cylindrical portion 14.
- the outer diameter of the base portion 15 is larger than the diameter of the opening 11.
- the cylindrical portion 14 and the base portion 15 are arranged concentrically.
- a recess 15 a is formed in the center of the lower surface of the base portion 15.
- the center of the recess 15a and the through hole 14a communicate with each other, and the inside of the recess 15a is maintained at atmospheric pressure.
- the fixing portion 16 is formed in an annular shape, and is disposed at the upper end of the cylindrical portion 14. That is, the fixing portion 16 is located outside the case 1.
- the caulking terminal 5 is fixed to the case upper wall 9 by the fixing portion 16. Before the caulking terminal 5 is fixed to the case upper wall 9, the fixing portion 16 extends in the axial direction of the cylindrical portion 14. That is, the cylindrical portion 14 and the fixing portion 16 constitute one cylindrical portion extending in the axial direction (hereinafter, the portion is referred to as a cylindrical portion).
- the cylindrical portion 14 corresponds to an example of the “columnar portion”.
- the cylindrical portion When fixing the caulking terminal 5 to the case upper wall 9, the cylindrical portion is inserted through the openings of the insulating member 36 (described later), the plate member 40 (described later) and the sealing member 19 (described later) Place on top of 15. Then, the cylindrical portion is inserted from the inside of the case 1 into the opening 11, the opening of the gasket 62 and the opening of the external terminal 60. Thereafter, the upper portion of the cylindrical portion (the portion projecting to the outside of the case 1) is bent outward in the axial right direction to push and spread. Thus, the cylindrical portion abuts on the top surface of the external terminal 60, and the caulking terminal 5 is caulked and fixed to the case upper wall 9.
- the cylindrical portion (that is, the bent portion of the cylindrical portion) corresponds to the fixing portion 16.
- FIG. 2 members disposed between the caulking terminal 5 and the case upper wall 9 will be described.
- Arrow A in FIG. 2 indicates the direction from the outside to the inside of the case 1.
- the direction indicated by the arrow A is referred to as “case inner side”
- the direction opposite to the direction indicated by the arrow A is referred to as “case outer side”.
- An annular insulating seal member 19 is disposed between the caulking terminal 5 and the case upper wall 9.
- the seal member 19 goes round the circumference of the cylindrical portion 14.
- Perfluoroalkoxy alkane (PFA) is used for the seal member 19.
- the seal member 19 has a thick portion 19a and a thin portion 19b.
- the thick portion 19a is in contact with the case upper wall 9 and the cylindrical portion 14 and the base portion 15 at the seal position S1 (shown by a thick line in FIG. 2. Hereinafter, other seal positions are similarly denoted by a thick line). ing. Specifically, the thick portion 19a is compressed by the case upper wall 9 and the cylindrical portion 14, and the case upper wall 9 and the base portion 15, and the case upper wall 9 and the caulking terminal 5 are compressed by the repulsive force at the time of compression.
- the compression rate of the thick portion 19a at the portion where the projection 17 abuts is higher than the compression rate of the thick portion 19a at the seal position S1 excluding the projection 17.
- the thick portion 19a is compressed by about 50% at the portion where the projection 17 abuts. Since the seal member 19 is formed of an insulating material, the insulation between the case upper wall 9 and the caulking terminal 5 is maintained.
- a thin portion 19 b which is thinner than the thick portion 19 a is formed at an end of the seal member 19 on the inner side of the case. The upper surface of the thin portion 19b is in contact with the case upper wall 9, and the lower surface is in contact with a thin portion 36a of the insulating member 36 described later.
- the material of the sealing member 19 is not limited to the above, and any material having sealing properties, insulating properties and electrolyte resistance (for example, ethylene-propylene rubber (EPM) such as ethylene propylene diene rubber (EPDM)) Good.
- EPM ethylene-propylene rubber
- EPDM ethylene propylene diene rubber
- An annular insulating member 36 is disposed closer to the inside of the case than the thick portion 19a.
- Polyphenylene sulfide (PPS) is used for the insulating member 36.
- the insulating member 36 goes round the circumference of the cylindrical portion 14.
- a thin portion 36 a having a thin thickness in the vertical direction is formed at an end of the insulating member 36 on the outer side of the case.
- the lower surface of the thin portion 36 a is in contact with the base portion 15, and the thickness in the vertical direction of the thin portion 36 a is shorter than the distance between the case upper wall 9 and the caulking terminal 5.
- a thin portion 19b of the seal member 19 is disposed in a space where the case upper wall 9 and the thin portion 36a face each other.
- the thin portion 19b is in contact with both the case upper wall 9 and the thin portion 36a at the sealing position S2.
- the thin portion 19b is compressed by the case upper wall 9 and the thin portion 36a at the sealing position S2, and seals between the case upper wall 9 and the thin portion 36a by the repulsive force at the time of compression.
- a protrusion 37 extending upward (that is, toward the thin portion 19b) is formed on the upper surface of the thin portion 36a.
- the protrusion 37 goes around the circumference of the cylindrical portion 14.
- the protrusion 37 is in contact with the thin portion 19 b and compresses the thin portion 19 b together with the case upper wall 9 (strictly, the case upper wall 9 in a portion facing the protrusion 37).
- the distance between the case top wall 9 and the projection 37 is shorter than the distance between the case top wall 9 and the thin portion 36 a at the sealing position S 2 excluding the projection 37. Therefore, the compression rate of the thin portion 19b at the portion where the projection 37 abuts is higher than the compression rate of the thin portion 19b at the seal position S2 excluding the projection 37.
- the thin portion 19 b is compressed by about 30% at the portion where the projection 37 abuts. That is, the compression ratio (about 50%) of the thick portion 19a by the protrusion 17 located on the case outer side (more specifically, the cylindrical portion 14 side) than the protrusion 37 is smaller than that of the thin portion 19b by the protrusion 37. Higher than compression rate (about 30%).
- the insulating member 36 corresponds to an example of the "first insulating member”
- the thin portion 19b of the portion in contact with the thin portion 36a corresponds to an example of the "second seal portion”
- the projection 37 is "first It corresponds to an example of "protrusion”.
- a thick portion 36 b which is thicker in the vertical direction is formed on the inside of the case than the thin portion 36 a of the insulating member 36.
- the thick portion 36 b is in contact with both the case upper wall 9 and the base portion 15.
- the thick portion 36 b determines the distance between the case upper wall 9 and the base 15. That is, the thick portion 36b plays the role of a spacer.
- the thin portion 19 b and the thin portion 36 a abut on the entire circumference in the axial direction by a length w 1. In other words, the axial length of the seal position S2 is w1 over the entire circumference.
- a gap with a length in the axial direction w2 runs around the circumference of the cylindrical portion 14 Is formed.
- a gap having a length in the axial direction w3 runs around the circumference of the cylindrical portion Is formed.
- a thin portion 36 c whose thickness in the vertical direction is thinner than the thick portion 36 b of the insulating member 36 is formed on the inner side of the case.
- the thin portion 36c extends the upper surface of the base portion 15 toward the inside of the case and then bends downward to cover the outer peripheral surface of the base portion 15 and extends to substantially the same height as the fracture plate 34 (described later) There is.
- the lower end surface of the insulating member 36 (strictly speaking, the thin portion 36 c) is in contact with the insulating member 39.
- the insulating member 39 is formed of PPS.
- the insulating member 39 covers the entire outer periphery of the lower surface of the fracture plate 34.
- An annular metal plate 40 is disposed on the outer peripheral surface of the insulating members 36 and 39, and the plate 40 is fixed to the insulating members 36 and 39 by caulking. Thereby, the base portion 15, the deformation plate 32 (described later), and the breaking plate 34 (described later) are clamped and fixed in the vertical direction. The insulation between the plate member 40, the base portion 15, the deformation plate 32, and the breaking plate 34 is maintained by the insulating members 36 and 39.
- the material of the insulating member 36 is not limited to the above, and even if a material (for example, polyetheretherketone (PEEK)) having insulating properties and electrolytic solution resistance and having excellent strength characteristics necessary for load support is used. Good.
- the space 20 on the case inner side of the thick portion 19a of the seal member 19 is a space 20
- the space 20 is a cylinder that goes around the cylindrical portion 14 It has a shape.
- An inner circumferential surface 20 a of the space 20 is located at the boundary between the thick portion 19 a and the thin portion 19 b of the seal member 19, and an outer circumferential surface 20 b of the space 20 is located at the outer circumferential surface of the base portion 15. .
- the thin portion 19b of the seal member 19 is entirely formed in the plane direction (ie, the plane direction substantially orthogonal to the axial direction of the cylindrical portion 14) (ie, from the inner peripheral surface 20a to the outer peripheral surface 20b of the space 20). And at least one of the insulating members 36 are disposed.
- the space 20 corresponds to an example of the "first space”
- the inner peripheral surface 20a corresponds to an example of the "end surface on the case outer side”
- the outer peripheral surface 20b corresponds to an example of the "end surface on the case inner side” .
- the current interrupting device 30 includes a deformation plate 32 made of metal and a breaking plate 34 made of metal.
- the outer peripheral portion of the deformation plate 32 is connected to the outer peripheral portion of the lower surface of the base portion 15, and the lower end of the recess 15 a of the base portion 15 is covered with the deformation plate 32. Since the inside of the recess 15 a is maintained at atmospheric pressure, atmospheric pressure acts on the upper surface of the deformation plate 32.
- the base portion 15, the deformation plate 32, and the breaking plate 34 are sandwiched and fixed by the plate member 40 via the annular insulating members 36 and 39.
- the deformation plate 32 is a circular conductive diaphragm and is convex downward.
- the central portion of the deformation plate 32 is connected to the breaking plate 34.
- the fracture plate 34 is a circular plate and is located below the deformation plate 32.
- the connection terminal 23 is connected to the breaking plate 34.
- a groove 34 a is formed at the center of the lower surface of the rupture plate 34.
- the fracture plate 34 and the central portion of the deformation plate 32 are connected inside the groove 34 a.
- the mechanical strength of the breaking plate 34 at the position where the groove 34a is formed is lower than the mechanical strength of the breaking plate 34 at a position other than the groove 34a.
- a vent hole 34 b is formed in the rupture plate 34, and the space 46 between the deformation plate 32 and the rupture plate 34 communicates with the space in the case 1.
- an annular insulating member 38 is disposed between the outer peripheral portion of the deformation plate 32 and the outer peripheral portion of the breaking plate 34.
- the current interrupting device 30 has a conduction path connecting the connection terminal 23, the breaking plate 34, the deformation plate 32, and the caulking terminal 5 in series. For this reason, the electrode assembly 3 and the caulking terminal 5 are electrically connected via the current path of the current interrupting device 30.
- the caulking terminal 5 and the caulking terminal 7 are in a state where current can be supplied.
- the pressure acting on the lower surface of the deformation plate 32 via the vent holes 34b rises.
- atmospheric pressure acts on the upper surface of the deformation plate 32.
- the deformation plate 32 is inverted to be in a state of being convex upward. Then, the fracture plate 34 connected to the central portion of the deformation plate 32 fractures from the mechanically fragile groove 34a.
- the conduction path connecting the breaking plate 34 and the deformation plate 32 is cut off, and the conduction between the electrode assembly 3 and the caulking terminal 5 is cut off.
- the deformation plate 32 is insulated from the connection terminal 23, and the breaking plate 34 is insulated from the caulking terminal 5.
- the space between the caulking terminal 5 and the case upper wall 9 is sealed at the sealing position S1 by the thick portion 19a of the sealing member 19. For this reason, it is suppressed that the electrolyte solution in case 1 leaks to the space of a case exterior rather than thick part 19a.
- the space 20 at least one of the thin portion 19b of the seal member 19 and the insulating member 36 is disposed in the entire planar direction. Therefore, in the space 20, the caulking terminal 5 and the case upper wall 9 do not directly face each other. Therefore, even if a high voltage is applied between the caulking terminal 5 and the case upper wall 9 in a state where the electrolytic solution is present in the space 20, short circuit between the caulking terminal 5 and the case upper wall 9 is suppressed. it can.
- the space between the case upper wall 9 and the thin portion 36 a of the insulating member 36 is sealed at the sealing position S 2 by the thin portion 19 b of the sealing member 19. Therefore, the electrolytic solution flowing to the outside of the case along the slight gap between the case upper wall 9 and the thick portion 36 b of the insulating member 36 and the slight gap between the insulating member 36 and the base portion 15 Thus, the contact with the electrolyte flowing to the outside of the case is suppressed. Accordingly, the caulking terminal 5 and the case upper wall 9 are prevented from coming into contact with each other through the electrolytic solution in the space 20, and a short circuit between the caulking terminal 5 and the case upper wall 9 can be further suppressed.
- the projection 37 is formed on the upper surface of the thin portion 36a in the range occupied by the sealing position S2, and the projection 37 is in contact with the thin portion 19b. For this reason, the sealing force of the thin portion 19b is increased at the portion where the projection 37 is in contact, and the electrolytic solution travels between the thin portion 19b and the case upper wall 9 and / or the thin portion 19b and the thin portion 36a. It is possible to further suppress outflow to the outside of the case. Further, the compression rate of the thin portion 19b at the portion where the projection 37 abuts is higher than the compression rate of the thin portion 19b at the seal position S2 excluding the projection 37.
- the caulking terminal 5 is attached to the case upper wall 9 in comparison with a configuration in which the thin portion 19b is compressed to the same degree as the compression ratio in the portion in contact with the projection 37 over the entire sealing position S2.
- the repulsive force of the thin portion 19b at the time of fixing can be reduced. According to this configuration, the caulking terminal 5 can be relatively easily caulked and fixed to the case upper wall 9 while enhancing the sealing force between the case upper wall 9 and the thin portion 36a.
- the protrusion 17 is formed on the base portion 15 in the range where the case upper wall 9 and the base portion 15 are opposed in the range occupied by the seal position S1, and the protrusion 17 is a thick portion It is in contact with 19a. Therefore, the sealing force of the thick portion 19a is increased at the portion where the projection 17 is in contact, and the leakage of the electrolyte into the space outside the case can be further suppressed. Further, the compression rate of the thick portion 19a at the portion where the projection 17 abuts is higher than the compression rate of the thick portion 19a at the seal position S1 excluding the projection 17. That is, the compression rate of the thick portion 19a at the sealing position S1 is locally high at the portion in contact with the projection 17.
- the caulking terminal 5 is formed on the case upper wall 9 in comparison with a configuration in which the thick portion 19a is compressed to the same degree as the compression ratio in the portion in contact with the projection 17 over the entire sealing position S1.
- the repulsive force of the thick portion 19a at the time of fixing to the According to this configuration, the caulking terminal 5 can be relatively easily caulked and fixed to the case upper wall 9 while increasing the sealing force between the case upper wall 9 and the caulking terminal 5.
- the repulsive force of the seal member 19 when the caulking terminal 5 is caulked and fixed to the case upper wall 9 becomes smaller as it approaches the cylindrical portion 14 when the compression ratio of the sealing member 19 during caulking and fixing is the same.
- the compression ratio of the thick portion 19 a by the projection 17 located closer to the cylindrical portion 14 than the projection 37 is higher than the compression ratio of the thin portion 19 b by the projection 37. Therefore, it is possible to suppress the increase in the repulsive force of the seal member 19 at the time of caulking and fixing while making the sealing force of the thick portion 19a by the projection 17 greater than the sealing force of the thin portion 19b by the projection 37.
- the projections 17 for compressing the seal member 19 with a higher compression rate are located on the outer side of the case than the projections 37, leakage of the electrolytic solution is suppressed in two stages. Therefore, the leakage suppression effect of the electrolytic solution can be improved.
- a part of the case inner side of the seal position S1 is located in the space 18. That is, a part of the case inner side of the seal position S1 is located in a range in which the caulking terminal 5 and the case upper wall 9 overlap in a state where the case upper wall 9 is viewed in plan, and in a range occupied by the fixing portion 16 There is. For this reason, the direction of the load that the fixing portion 16 exerts on the case upper wall 9 and the direction of the compressive force for sealing the caulking terminal 5 and the case upper wall 9 become the same. The portion between the crimp terminal 5 and the case upper wall 9 can be tightly sealed.
- the seal position S2 is also located in the space 18.
- the space between the case upper wall 9 and the thin portion 36a of the insulating member 36 can be firmly sealed. Furthermore, projections 17 and 37 are also located in the space 18. For this reason, the sealing force of the seal member 19 at the portion in contact with the projections 17 and 37 can be further increased.
- a power storage device module including a plurality of power storage devices 100 the respective power storage devices 100 are connected in series, and are connected in series until a desired voltage is obtained.
- a high-power, large-capacity storage device module can be configured.
- a high voltage is easily applied between the caulking terminal 5 and the case upper wall 9. For this reason, the possibility of a short circuit can be effectively reduced by adopting the configuration of the present embodiment in each power storage device 100 configuring the power storage device module.
- the two-dot chain line portion 300a of FIG. 3 corresponds to the two-dot chain line portion 200a of FIG.
- a seal member 119 is disposed between the cylindrical portion 14 and the case upper wall 9 and between the fixed portion 16 and the case upper wall 9. The seal member 119 is in contact with the cylindrical portion 14 and the fixing portion 16 and the case upper wall 9 at the seal position S5, and seals between them.
- a projection 10 is formed extending around the circumference of the cylindrical portion 14 while extending.
- the projection 10 compresses the seal member 119 together with the fixing portion 16.
- a space where the case upper wall 9 and the fixing portion 16 face each other is a space 118
- a part (more specifically, the protrusion 10) of the case outside of the sealing position S5 is located in the space 118.
- the seal member 119 corresponds to an example of the “first seal member”, and the seal member 119 of the portion of the seal member 119 located between the cylindrical portion 14 and the fixing portion 16 and the case upper wall 9
- the projection 10 corresponds to an example of the “second protrusion”.
- An insulating member 136 is disposed closer to the inside of the case than the seal member 119.
- a thin portion 136 a is formed at the end of the insulating member 136 on the outer side of the case.
- the thin portion 136a is in contact with the seal member 119 by a length w4 in the axial direction.
- a gap with a length w5 in the axial direction is formed circumferentially. The relationship of w4> w5 is established between w4 and w5.
- the sealing member 119 and the insulating member 136 At least one of the two is arranged.
- the insulating member 136 corresponds to an example of the “first insulating member”
- the space 120 corresponds to an example of the “first space”.
- the caulking terminal 5 and the case upper wall 9 do not directly face each other in the space 120, a short circuit between the both can be suppressed. Further, by forming the projection 10, the sealing force of the seal member 119 for sealing between the caulking terminal 5 and the case upper wall 9 can be increased, and leakage of the electrolyte to the space outside the case can be further suppressed.
- the caulking terminal 5 is attached to the case upper wall 9 while the sealing force is enhanced as compared with the configuration in which the sealing member 119 is compressed over the entire sealing position S5 by compressing the sealing member 119 locally by the projection 10. It can be fixed relatively easily.
- the portion between the caulking terminal 5 and the case upper wall 9 can be firmly sealed at a part of the case outer side of the seal position S5.
- the projection 10 since the projection 10 is located in the space 118, the sealing force of the seal member 119 at the portion in contact with the projection 10 can be further increased.
- the two-dot chain line portion 400a in FIG. 4 corresponds to the two-dot chain line portion 200a in FIG.
- the configuration of the current interrupting device is different from that of the first embodiment, and the other configuration is the same as that of the first embodiment.
- the current interrupting device 70 includes a first deformation plate 75 made of metal, a breaking plate 73 made of metal, and a second deformation plate 71 made of metal.
- the base portion 15, the first deformation plate 75, the breaking plate 73 and the second deformation plate 71 are supported by insulating members 36 and 78 having insulating properties.
- a metal plate 79 is crimped on the outer peripheral surface of the insulating members 36 and 78.
- the second deformation plate 71 is disposed below the breaking plate 73, and its central portion protrudes downward.
- An insulating member 81 is disposed on the outer peripheral portion of the upper surface of the second deformation plate 71. Further, at the center of the upper surface of the second deformation plate 71, a protruding portion 83 which protrudes upward is provided.
- the central portion 73 b (portion surrounded by the groove portion 73 a) of the breaking plate 73 is located above the projecting portion 83.
- the pressure of the space in the case 1 acts on the lower surface of the second deformation plate 71.
- the pressure of the space 86 between the second deformation plate 71 and the breaking plate 73 acts on the upper surface of the second deformation plate 71 (described later). Space 86 is sealed from the space in case 1.
- the breaking plate 73 is disposed between the second deformation plate 71 and the first deformation plate 75.
- the fracture plate 73 is divided by the groove portion 73 a into a central portion 73 b surrounded by the groove portion 73 a and an outer peripheral portion 73 c located on the outer peripheral side of the groove portion 73 a.
- the thickness of the central portion 73b is thin, and the thickness of the outer peripheral portion 73c is thick.
- An air vent 73 d is formed in the breaking plate 73.
- the space 86 communicates with the space 88 between the first deformation plate 75 and the breaking plate 73 through the vent holes 73 d.
- the first deformation plate 75 is disposed above the breaking plate 73.
- the first deformation plate 75 has substantially the same configuration as the deformation plate 32 of the first embodiment.
- An insulating member 85 is disposed between the first deformation plate 75 and the breaking plate 73.
- a space 87 is formed between the upper surface of the first deformation plate 75 and the lower surface of the base portion 15. The space 87 is maintained at atmospheric pressure.
- a seal member 89 is disposed between the rupture plate 73 and the outer peripheral portion of the base portion 15, and seals the gap between the base portion 15 and the rupture plate 73.
- the current interrupting device 70 has a conduction path connecting the connection terminal 23, the breaking plate 73, the first deformation plate 75, and the caulking terminal 5 in series. For this reason, the electrode assembly 3 and the caulking terminal 5 are electrically connected via the current path of the current interrupting device 70.
- the second deformation plate 71 when the second deformation plate 71 is reversed, the projection 83 of the second deformation plate 71 collides with the central portion 73b of the breaking plate 73, and the breaking plate 73 is broken at the groove 73a.
- the first deformation plate 75 is reversed, and the first deformation plate 75 and the central portion 73b of the breaking plate 73 are displaced upward.
- rupture board 73 and the 1st deformation board 75 is interrupted
- the first deformation plate 75 is insulated from the connection terminal 23, and the breaking plate 73 is insulated from the caulking terminal 5.
- the current interrupting device 70 even after the current interrupting device 70 operates, a part of the sealing member 19 and the insulating member 36 are disposed in the entire space 20. Also with this configuration, the same function and effect as those of the power storage device 100 of the first embodiment can be obtained. In addition, the above-mentioned current interrupting device 70 may be attached to the power storage device of the other embodiment and modification.
- the two-dot chain line portion 500a in FIG. 5 corresponds to the two-dot chain line portion 200a in FIG.
- the configuration of the negative electrode terminal 205 is different from that of the first embodiment.
- the negative electrode terminal 205 has a cylindrical portion 214 and a base portion 215.
- the cylindrical portion 214 is inserted from the inside of the case 1 to the case upper wall with the cylindrical portion 214 inserted through the openings of the insulating member 36, the plate 40 and the sealing member 19. It is inserted into the opening 11 of 9.
- the annular insulating member 22 is attached to the cylindrical portion 214 from the outside of the case 1 and is brought into contact with the case upper wall 9. Thereafter, the nut 21 is fastened to the cylindrical portion 214 from the outside of the case 1.
- the negative electrode terminal 205 is fixed to the case upper wall 9, and the seal member 19 and the insulating member 36 are sandwiched between the case upper wall 9 and the base portion 215.
- Through holes 214 a are formed in the negative electrode terminal 205 in the axial direction (vertical direction).
- the bus bar bolt 47 is attached to the through hole 214a.
- a bus bar 49 is disposed between the head of the bus bar bolt 47 and the negative electrode terminal 205. When the bus bar bolt 47 is attached to the through hole 214 a, the bus bar 49 is held between the head of the bus bar bolt 47 and the negative electrode terminal 205.
- the negative electrode terminal 205 corresponds to an example of the “terminal”.
- the protrusion 217 is formed on the upper surface of the base portion 215 in a range in which the case upper wall 9 and the base portion 215 face each other in the range occupied by the sealing position S1.
- the protrusions 217 have substantially the same configuration as the protrusions 17 of the first embodiment.
- the space 218 is a space within a range overlapping with the nut 21 when the case upper wall 9 is viewed in plan. A part of the side and the sealing position S2 are located.
- the protrusions 217, 37 are located in the space 218.
- the thin part 19b and the insulating member At least one of 36 is arranged. Also with this configuration, the same function and effect as those of the power storage device 100 of the first embodiment can be obtained. Further, in the present embodiment, a part of the seal position S1 is located in the space 218. As a result, the direction of the tightening force applied to the case upper wall 9 by the nut 21 and the direction of the compression force for sealing the case upper wall 9 and the base portion 215 become the same. A strong seal can be made between the wall 9 and the base portion 215.
- the seal position S2 is also located in the space 218, the space between the case upper wall 9 and the insulating member 36 can be strongly sealed. Furthermore, since the protrusions 217 and 37 are also located in the space 218, the sealing force of the seal member 19 in the portion in contact with the protrusions 217 and 37 can be further increased.
- the protrusion 217 corresponds to an example of the “second protrusion”
- the space 220 corresponds to an example of the “first space”.
- the two-dot chain line portion 600a in FIG. 6 corresponds to the two-dot chain line portion 200a in FIG.
- the seal member 19 instead of the seal member 19, two seal members 319 and 321 that go around the circumference of the cylindrical portion 14 are disposed.
- the seal member 319 is formed of PFA
- the seal member 321 is formed of polytetrafluoroethylene (PTFE).
- the seal member 319 seals between the case upper wall 9 and the caulking terminal 5 at the seal position S6.
- a protrusion 17 is formed on the upper surface of the base portion 15 in a range in which the case upper wall 9 and the base portion 15 overlap when the case upper wall 9 is viewed in a plan view out of the range occupied by the sealing position S6.
- the seal member 319 is compressed by about 50% by the projection 17.
- An insulating member 36 is disposed on the upper surface of the base portion 15 closer to the inside of the case than the sealing member 319.
- the thin portion 36 a of the insulating member 36 is in contact with the seal member 319.
- a seal member 321 for sealing between the case upper wall 9 and the thin portion 36a at the sealing position S7 is disposed.
- a projection 37 is formed on the upper surface of the thin portion 36a in the range occupied by the sealing position S7.
- the seal member 321 is compressed by about 30% by the projection 37.
- the seal member 319 corresponds to an example of the “second seal member”
- the seal member 321 corresponds to an example of the “third seal member” and the “fourth seal portion”
- the insulating member 36 is a “second insulating member”. "Corresponds to an example of”.
- the space 318 overlapping the fixed portion 16 when the case upper wall 9 is viewed in plan is the space 318, and the space 318 is the case interior side of the seal position S6. And a seal position S7.
- the projections 17, 37 are located in the space 318.
- the space 320 In the space between the caulking terminal 5 and the case upper wall 9, assuming that the space on the case inner side of the seal position S6 is the space 320, the space 320 has the sealing member 321 and the insulation in the entire planar direction. At least one of the members 36 is disposed. Also with this configuration, the same function and effect as those of the power storage device 100 of the first embodiment can be obtained.
- the seal member that is, the seal member 319) with which the projection 17 abuts and the seal member (that is, the seal member 321) with which the projection 37 abuts are different. Therefore, the seal members 319 and 321 can be formed of different materials, and the compression rates of the seal members 319 and 321 can be easily adjusted.
- the space 320 corresponds to an example of the “second space”.
- the two-dot chain line portion 700a in FIG. 7 corresponds to the two-dot chain line portion 200a in FIG.
- the power storage device of the sixth embodiment differs from the power storage device of the second embodiment in that a protrusion 410 is formed instead of the protrusion 17. That is, in the present embodiment, in the range occupied by the seal position S1, the case upper wall 9 and the base portion 15 overlap in the range where the case upper wall 9 overlaps, extending downward on the lower surface of the case upper wall 9 The protrusion 410 is formed. The protrusion 410 goes around the circumference of the cylindrical portion 14.
- the protrusion 410 is in contact with the thick portion 19a, and compresses the thick portion 19a together with the base portion 15 (strictly, the base portion 15 in a portion facing the protrusion 410).
- the compression rate of the thick portion 19a at the portion where the projection 410 abuts is higher than the compression rate of the thick portion 19a at the seal position S1 excluding the projection 410.
- the thick portion 19a is compressed by about 50% at the portion where the projection 410 abuts.
- the projection 37 extending upward is formed on the upper surface of the thin portion 36a.
- the thin portion 19 b is compressed by about 30% at the portion where the projection 37 abuts.
- the compression ratio (approximately 50%) of the thick portion 19a by the projection 17 located on the case outer side (that is, the cylindrical portion 14 side) than the projection 37 is the compression ratio of the thin portion 19b by the projection 37 Higher than about 30%). Also with this configuration, the same function and effect as those of the first embodiment can be obtained. Further, by forming the projection 410 not on the base portion 15 side but on the case upper wall 9 side, the projection 410 can be formed as follows: “when the case upper wall 9 is viewed in plan in the range occupied by the seal position S1 It can be easily arranged by “the overlapping range with the base portion 15”.
- the power storage device disclosed in this specification includes various variations and modifications of the above-described embodiments.
- the case upper wall 9 and the insulating member 36 may not be sealed. .
- the projections 17 and 37 may not be formed, or only one of the projections 17 and 37 may be formed.
- the projection 37 is not limited to the configuration formed on the insulating member 36, and may be formed on the case upper wall 9 and / or the caulking terminals 5, 7, for example. Since the case upper wall 9 and the caulking terminals 5 and 7 are made of metal having high rigidity, the sealing member 19 can be appropriately compressed even if the projection 37 is formed on these members. Also, a plurality of the projections 17 and 37 may be formed. Further, the compression rate of the seal member 19 due to the projections 17 and 37 is not limited to the ratio described in the above embodiment.
- the compression ratio of the thick portion 19a by the projection (that is, the projection 17) located on the cylindrical portion 14 side may be adjusted in the range of about 30 to about 80% or a position away from the cylindrical portion 14
- the compression ratio of the thin portion 19b due to the projection located at (ie, the projection 37) may be adjusted in the range of about 0 to about 50%.
- the compression ratio of the thin portion 19b by the projection located at a position away from the cylindrical portion 14 may be larger than the compression ratio of the thick portion 19a by the projection located at the cylindrical portion 14 side.
- the thin portion 19b of the seal member 19 is not limited to the configuration for sealing between the case upper wall 9 and the thin portion 36a of the insulating member 36, but is a configuration for sealing between the base portion 15 and the thin portion 36a. May be Further, the seal member 321 may be configured to seal between the base portion 15 and the thin portion 36a.
- the insulating member 81 may not be disposed. Further, communication holes may be formed in the first deformation plate 75 to connect the space 87 and the space 88, and the spaces 86 and 88 may be maintained at atmospheric pressure.
- the thin portion 319a may be formed at the end of the sealing member 319 on the inner side of the case.
- the thin portion 319a may be disposed between the case upper wall 9 and the thin portion 36a of the insulating member 36 to seal between the two.
- at least one of the thin portion 319a, the seal member 319 and the insulating member 36 is disposed in the space 320, and direct opposition of the case upper wall 9 and the base portion 15 in the space 320 can be suppressed. .
- the current interrupting device 30 may be provided on the side of the caulking terminal 7 or may be provided on both the caulking terminal 5 and the caulking terminal 7.
- the seal member and the insulating member are disposed between the caulking terminal 7 and the case upper wall 9 as in the configuration of the above embodiment.
- the conduction with the breaking plate 34 is interrupted by reversing the deformation plate 32.
- the method of deformation of the deformation plate 32 is not limited to inversion.
- the rupture plate 34 may be fractured starting from the groove portion 34a by bending the central portion of the deformation plate 32 upward, and the conduction between the deformation plate 32 and the rupture plate 34 may be cut off.
- the deformation plate 32 may be deformed in any way as long as the conduction between the deformation plate 32 and the breaking plate 34 is interrupted. The same applies to the second deformation plate 75.
- the seal member 19 is disposed in the space between the cylindrical portion 14 and the case upper wall 9 (strictly, the opening 11) in the above embodiment, the present invention is not limited to this configuration.
- the seal member 19 may be disposed only in the space where the case upper wall 9 and the base 15 face each other.
- the seal member 419 plays a role of holding the cylindrical portion 14 in the opening 11 as well as suppressing the entry of moisture, dust and the like into the case from the outside of the case.
- the first insulation is provided on the inside of the case of the seal member 19.
- the members may not be arranged.
- an insulating member functioning as a spacer may be disposed in the space between the seal member 419 and the seal member 19.
- the contact portion When the portion where the thin portion 19 b of the seal member 19 and the thin portion 36 a of the insulating member 36 are in contact is located between the case upper wall 9 and the base portion 15, the contact portion is , And may be located radially outward of the space 18. That is, the projection 37 may be located radially outward of the space 18.
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
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Abstract
Description
Claims (9)
- 正極電極及び負極電極を備えている電極組立体と、電解液と、が収容可能なケースと、
前記ケースの端子壁に形成された開口を介して前記ケースの内外に通じている端子と、
前記ケース内に収容されており、前記端子と前記正極電極、又は前記端子と前記負極電極に電気的に接続されていると共に、前記端子と前記正極電極又は前記負極電極とを導通状態から非導通状態に切換える導電性部材を有する電流遮断装置と、を備えており、
前記端子は、前記開口に挿通された柱状部と、前記柱状部の一端に配置されており前記ケースの内部に位置する基底部と、を有しており、
前記基底部は、前記端子壁を平面視した状態で前記開口より大きく、かつ、前記導電性部材と電気的に接続されており、
前記端子と前記端子壁との間には、前記端子と前記端子壁の双方と当接することで、前記端子と前記端子壁との間をシールする第1シール部分を有する絶縁性の第1シール部材が配置されており、
前記第1シール部材は前記柱状部の周囲を一巡しており、
前記端子と前記端子壁との間の空間のうち前記第1シール部分よりもケース内部側の第1空間には、前記柱状部の周囲を一巡する絶縁性の第1絶縁部材が配置されており、
前記第1空間には、前記第1空間のケース外部側の端面からケース内部側の端面まで、前記第1シール部材と前記第1絶縁部材の少なくとも一方が配置されている、蓄電装置。 - 前記第1シール部材は、前記端子壁と前記端子の一方と前記第1絶縁部材とが対向する空間において、前記端子壁と前記端子の一方と前記第1絶縁部材の双方と当接することで、前記端子壁と前記端子の一方と前記第1絶縁部材との間をシールする第2シール部分を有する、請求項1に記載の蓄電装置。
- 前記第2シール部分が占める範囲では、前記第1絶縁部材と、前記端子壁と、前記端子の少なくとも1つに、前記第1シール部材側に突出する第1突起が形成されており、
前記第1突起は、前記第1シール部材と当接している、請求項2に記載の蓄電装置。 - 前記端子壁を平面視したときに、前記第1シール部分が占める範囲のうち前記端子と前記端子壁とが重なる範囲では、前記端子又は前記端子壁の一方に、前記端子又は前記端子壁の他方に向かって延びる第2突起が形成されており、
前記第2突起は、前記第1シール部材と当接している、請求項1~3のいずれか一項に記載の蓄電装置。 - 前記第1シール部材は、前記第1絶縁部材と前記端子壁又は前記端子とが対向する空間において、前記第1絶縁部材と前記端子壁又は前記端子の双方と当接することで、前記第1絶縁部材と前記端子壁又は前記端子との間をシールする第2シール部分を有しており、
前記第2シール部分が占める範囲では、前記第1絶縁部材と、前記端子壁と、前記端子の少なくとも1つに、前記第1シール部材側に突出する第1突起が形成されており、
前記第1突起は、前記第1シール部材と当接しており、
前記第1突起と前記第2突起のうち、前記端子の前記柱状部に近接している一方の突起と当接している部分における前記第1シール部材の圧縮率は、前記柱状部から離間している他方の突起と当接している部分における前記第1シール部材の圧縮率よりも大きい、請求項4に記載の蓄電装置。 - 正極電極及び負極電極を備えている電極組立体と、電解液と、が収容可能なケースと、
前記ケースの端子壁に形成された開口を介して前記ケースの内外に通じている端子と、
前記ケース内に収容されており、前記端子と前記正極電極、又は前記端子と前記負極電極に電気的に接続されていると共に、前記端子と前記正極電極又は前記負極電極とを導通状態から非導通状態に切換える導電性部材を有する電流遮断装置と、を備えており、
前記端子は、前記開口に挿通された柱状部と、前記柱状部の一端に配置されており前記ケースの内部に位置する基底部と、を有しており、
前記基底部は、前記端子壁を平面視した状態で前記開口より大きく、かつ、前記導電性部材と電気的に接続されており、
前記端子と前記端子壁との間には、前記端子と前記端子壁の双方と当接することで、前記端子と前記端子壁との間をシールする第3シール部分を有する絶縁性の第2シール部材が配置されており、
前記第2シール部材は前記柱状部の周囲を一巡しており、
前記端子と前記端子壁との間の空間のうち前記第3シール部分よりもケース内部側の第2空間には、前記柱状部の周囲を一巡する絶縁性の第2絶縁部材が配置されており、
前記第2絶縁部材と前記端子壁又は前記端子とが対向する空間には、前記第2絶縁部材と前記端子壁又は前記端子の双方と当接することで、前記第2絶縁部材と前記端子壁又は前記端子との間をシールし、前記柱状部の周囲を一巡する第4シール部分を有する絶縁性の第3シール部材が配置されており、
前記第2空間には、前記第2空間のケース外部側の端面からケース内部側の端面まで、前記第2シール部材と、前記第3シール部材と、前記第2絶縁部材の少なくともいずれかが配置されている、蓄電装置 - 前記端子は、前記柱状部の、前記基底部が配置されている側とは反対側に配置されており、前記ケースの外部に位置すると共に前記柱状部の前記反対側より軸直方向外側に屈曲して前記端子を前記端子壁に固定する固定部を有しており、
前記第1シール部分又は前記第3シール部分は、前記端子壁を平面視した状態で前記端子と前記端子壁とが重なる範囲で、かつ、前記固定部が占める範囲に位置している、請求項1~6のいずれか一項に記載の蓄電装置。 - 前記端子は、前記ケースの外部に位置するナットにより前記端子壁に締め付け固定されており、
前記第1シール部分又は前記第3シール部分は、前記端子壁を平面視した状態で前記端子と前記端子壁とが重なる範囲で、かつ、前記ナットが占める範囲に位置している、請求項1~6のいずれか一項に記載の蓄電装置。 - 請求項1~8のいずれかに記載の蓄電装置を複数備え、それら複数の蓄電装置が直列接続されている蓄電装置モジュール。
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DE112015002261.9T DE112015002261T5 (de) | 2014-05-12 | 2015-04-06 | Elektrizitätsspeichervorrichtung |
JP2016519157A JP6296153B2 (ja) | 2014-05-12 | 2015-04-06 | 蓄電装置 |
US15/309,894 US10320208B2 (en) | 2014-05-12 | 2015-04-06 | Electricity storage device |
CN201580025089.XA CN106463689B (zh) | 2014-05-12 | 2015-04-06 | 蓄电装置 |
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JPWO2015174165A1 (ja) | 2017-04-20 |
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US10320208B2 (en) | 2019-06-11 |
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