WO2022259722A1 - 電池モジュール、及びこの電池モジュールの検査方法 - Google Patents
電池モジュール、及びこの電池モジュールの検査方法 Download PDFInfo
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- WO2022259722A1 WO2022259722A1 PCT/JP2022/015121 JP2022015121W WO2022259722A1 WO 2022259722 A1 WO2022259722 A1 WO 2022259722A1 JP 2022015121 W JP2022015121 W JP 2022015121W WO 2022259722 A1 WO2022259722 A1 WO 2022259722A1
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- Prior art keywords
- battery
- heat
- battery module
- temperature change
- battery container
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- 238000007689 inspection Methods 0.000 claims description 100
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Images
Classifications
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/647—Prismatic or flat cells, e.g. pouch cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
-
- 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
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6572—Peltier elements or thermoelectric devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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- 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
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
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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 present invention relates to a battery module configured by connecting a plurality of unit batteries, and an inspection method for this battery module.
- an electrolyte battery including a positive electrode layer and a negative electrode layer capable of intercalating/releasing lithium ions is widely used as a high energy density battery in various fields such as electric vehicles, power storage, and information equipment.
- Electrolyte batteries that use a liquid electrolyte or those that use a solid electrolyte are known.
- a secondary battery using an electrolyte battery is composed of an assembled battery in which multiple unit batteries (electrolyte batteries) are connected.
- This battery module can obtain a large amount of electric power by electrically connecting the unit cells with electrode members (hereinafter referred to as bus bars) made of a conductive metal such as aluminum, copper, iron, or the like.
- the battery module includes a pair of external terminals that enable power transfer to and from the battery module, and the busbars and the pair of module external terminals provide insulation between adjacent busbars and a high current portion including the module external terminals. It is mainly composed of an insulating member made of engineering plastic.
- the battery module is equipped with a temperature detector such as a thermistor for detecting its own temperature, and obtains battery temperature information and uses it for charge/discharge control of the battery module.
- a temperature detector such as a thermistor for detecting its own temperature
- battery modules mounted on automobiles and the like are used under a wide range of environmental temperatures from low temperature to high temperature. Since the input/output characteristics and life characteristics of the battery are dependent on the temperature, battery temperature information is essential in order to appropriately control charging and discharging of the battery module.
- the temperature detector In a battery module equipped with such a temperature detector, it is necessary to check whether the temperature detector is working properly from the viewpoint of product quality. For this reason, generally, the temperature of the battery module is increased by operating the battery module, and the operation of the temperature detector is confirmed by whether or not this temperature change can be detected. This is not a good idea because it will put an electrical load on the module.
- Patent Document 1 As a method for solving such problems, for example, the technique described in Japanese Patent Application Laid-Open No. 2016-9663 (Patent Document 1) is known.
- a heat transfer plate provided in contact with the side surface of the battery is heated by an external heat source such as a heater to cause a temperature change in the thermistor attached to the upper surface of the battery. operation is confirmed.
- Patent Document 1 there is a problem that efficient inspection cannot be performed well. For example, the work process of attaching and detaching the heat transfer plate is required, and the inspection work is troublesome, or the power consumption of the heat source such as the heater that heats the heat transfer plate increases, or the temperature is detected via the heat transfer plate. There are one or more problems, such as the slow rise in temperature due to the application of heat to the vessel and the time it takes to check the operation of the temperature detector.
- An object of the present invention is to provide a battery module that can be efficiently inspected without applying an electrical load to the battery module, and a method for inspecting this battery module.
- a representative feature of the present invention is a battery comprising a battery container containing battery elements, a temperature detector thermally connected in contact with the outer surface of the battery container, and a part of the battery container covering and A covering member having electrical insulation and rigidity for bringing the temperature detector into contact with the battery container is provided. It is arranged at a position outside the heat application area, which is a projection area in which the through holes are projected onto the outer surface of the battery container.
- the heat applying means directly heats or cools the heat applying region through the inspection through hole provided in the covering member, thereby increasing the temperature in the vicinity of the temperature detector in a short time, or It can be lowered and an efficient inspection can be performed.
- FIG. 1 is an external perspective view of a battery module to which the present invention is applied;
- FIG. 2 is an exploded perspective view showing a partially exploded state of the battery module shown in FIG. 1.
- FIG. 1 is a cross-sectional view showing the first embodiment of the present invention and showing a state before an insulation cover is attached.
- FIG. 4 is a cross-sectional view showing the first embodiment of the present invention and showing an inspection state after the insulation cover is attached;
- FIG. 10 is a cross-sectional view showing a modified example of the first embodiment of the present invention and showing an inspection state after the insulation cover is attached.
- 1 is a schematic diagram of a thermistor testing system;
- FIG. FIG. 4 is a characteristic diagram showing changes in the thermistor-measured temperature over time after the battery container is heated.
- FIG. 7 is a flowchart for explaining the flow of inspection using the inspection system shown in FIG. 6;
- FIG. 6 is a cross-sectional view showing a second embodiment of the present invention and showing a state before an insulation cover is attached;
- FIG. 11 is a cross-sectional view showing a third embodiment of the present invention and showing a state after the insulation cover is attached;
- FIG. 11 is a top view of a battery module showing a fourth embodiment of the present invention and illustrating a state of wiring attached to an insulation cover;
- FIG. 12 is an external perspective view of the battery module shown in FIG. 11;
- FIG. 11 is a cross-sectional view showing a fifth embodiment of the present invention and showing a state before an insulation cover is attached;
- FIG. 11 is a cross-sectional view showing a sixth embodiment of the present invention and showing a state before an insulation cover is attached;
- FIG. 1 is a view of a battery module according to an embodiment of the present invention seen obliquely from above. 1 and 2 indicate the viewing direction of the battery module shown in FIGS. For this reason, when describing the directions of "up and down, left and right, and front and back" below, the viewing directions shown in FIGS. 1 and 2 will be used as the basis.
- the housing 11 that constitutes the battery module 10 is generally long and narrow, with dimensions in the longitudinal direction (front-rear direction) being greater than the dimensions in the lateral direction (horizontal direction) and height direction (vertical direction). It has a rectangular parallelepiped shape and holds a plurality of unit batteries 13 (see FIG. 2) that constitute a battery group 12 (see FIG. 2). More specifically, the housing 11 includes a plurality of cell holders 14 (see FIG. 2), a pair of end plates 15, a pair of side plates 16, an insulation cover (inner covering member) 17, and a module cover ( outer covering member) 18. The end plate 15 and the side plate 16 are firmly fixed by fixing members 19 such as fixing bolts and rivets as shown in FIG.
- the unit battery 13 incorporates battery elements including an electrolyte, a positive electrode layer, a negative electrode layer, and the like.
- a liquid or solid electrolyte can be used.
- the cell holder 14 (see FIG. 2) is made of a resin material such as polybutylene terephthalate (PBT).
- PBT polybutylene terephthalate
- a pair of cell holders 14 arranged at both ends of the battery group 13 in the longitudinal direction (front-rear direction) of the plurality of unit batteries 13 constituting the battery group 12 are provided with assembled battery terminals 10P and 10N (external terminals of the battery module 10). 2) are provided respectively.
- the module terminal 10P is an assembled battery positive terminal
- the module terminal 10N is an assembled battery negative terminal.
- the pair of end plates 15 are plate-like members made of metal.
- the pair of end plates 15 are mounted on both sides of the battery group 12 via a pair of cell holders 14 arranged on both sides of the battery group 12 in the stacking direction (front-rear direction) of the plurality of unit batteries 13 constituting the battery group 12 . are placed in One surface of the pair of end plates 15 faces each other so as to sandwich the plurality of unit batteries 13 held by the cell holder 14 , and a fixing portion 15 a is provided on the other surface facing outward on the side opposite to the battery group 12 . .
- the fixing portions 15a provided on the pair of end plates 15 are formed in a generally cylindrical shape, and a part of the cylindrical side surface protrudes from the outer plane of the end plates 15 toward the front or rear direction of the assembled battery.
- the fixed portion 15a has a bolt hole along a central axis parallel to the height direction (vertical direction) of the end plate 15. As shown in FIG.
- the fixing portion 15a of the end plate 15 is a fixing member mounting portion for fixing the battery module 10 to an external mechanism such as a vehicle or other machine.
- a lower end surface of the fixing portion 15a of the end plate 15 is a support surface 11a of the housing 11 supported by the external mechanism as described above.
- the support surface 11a of the housing 11, which is the bottom surface of the fixed portion 15a of the end plate 15, is supported by an external mechanism, and the bolt inserted through the bolt hole of the fixed portion 15a is a female screw of the external mechanism or It can be fixed to an external mechanism by screwing it onto a nut and tightening it.
- the battery module 10 is fixed to the external mechanism by bolts, and is supported by the external mechanism at least on the support surface 11 a of the housing 11 , which is the lower end surface of the fixed portion 15 a of the end plate 15 .
- the external mechanism to which the battery module 10 is fixed is the vehicle body of these vehicles.
- the length direction (front-rear direction) and width direction (left-right direction) of the housing 11 of the battery module 10 are It is generally parallel to the horizontal direction
- the height direction (vertical direction) of housing 11 of battery module 10 is generally parallel to the vertical direction.
- the support surface 11a of the housing 11 is approximately parallel to the horizontal plane.
- the pair of side plates 16 are arranged on both sides in the width direction (horizontal direction) of the plurality of unit batteries 13 that make up the battery group 12 via the cell holders 14 .
- the pair of side plates 16 are generally rectangular plate-shaped metal members, and are arranged on both sides of the housing 11 in the width direction (horizontal direction) so as to face each other.
- the pair of side plates 16 are generally rectangular, and the stacking direction (front-rear direction) of the plurality of unit batteries 13 forming the battery group 12 is the long side direction, that is, the longitudinal direction.
- the height direction (vertical direction) of 13 is defined as the short side direction, that is, the lateral direction.
- Both ends of the pair of side plates 16 in the longitudinal direction are respectively fastened to the pair of end plates 15 by fixing members 19 such as rivets and bolts. Both lateral ends of the pair of side plates 16 are engaged with concave grooves provided in the cell holder 14 .
- the insulation cover 17 is a plate-shaped member made of resin such as PBT having electrical insulation properties and having a predetermined rigidity. is arranged so as to face the upper end surface of the Note that the predetermined rigidity means a degree of rigidity that does not cause unnecessary deformation when the insulation cover 17 is attached to the battery module 10 . In other words, it is sufficient that the insulation cover 17 has sufficient rigidity.
- the insulation cover 17 is provided between openings exposing the upper end faces of the cell positive terminals 13p and the cell negative terminals 13n of the plurality of unit batteries 13 and between the cell positive terminals 13p and the cell negative terminals 13n of the unit batteries 13 adjacent to each other. and partition walls for insulating between the busbars 2 adjacent to each other.
- the partition wall of the insulation cover 17 is provided so as to surround the cell positive terminal 13p, the cell negative terminal 13n, and the bus bar 20 of the unit battery 13.
- Various electric wirings connected to the battery group 12 and an electronic circuit board constituting a battery control device (not shown) are arranged on the insulation cover 17 .
- An electronic circuit board (not shown) is arranged between the insulation cover 17 and the module cover 18, that is, on the opposite side of the insulation cover 17 to the battery group 12 in the height direction of the housing 11. It is electrically connected to a plurality of bus bars 20 and a temperature sensor (thermistor) (not shown) for detecting the temperature of the unit battery 1 via connection conductors such as wiring.
- a temperature sensor thermoistor
- a battery module 10 mainly includes module terminals 10P and 10N (see FIG. 2) which are external terminals, a battery group 12 including a plurality of unit batteries 13, and a plurality of unit batteries 13 of the battery group 12. , and a bus bar 20 for electrically and mechanically connecting the battery group 12 and the module terminals 10P, 10N.
- the battery group 12 is configured by stacking flat prismatic unit batteries 13, that is, thin hexahedral or rectangular parallelepiped unit batteries 13 whose thickness dimension is smaller than their width dimension and height dimension, in the longitudinal direction (back and forth direction). ing.
- the unit battery 13 is a prismatic lithium ion battery, and includes a flat prismatic battery container 13a, an electrode group (not shown) housed inside the battery container 13a, an electrolytic solution or a solid electrolyte sheet, and the electrode group. and a pair of cell terminals 13p and 13n arranged on the upper end face in the height direction of the battery container 13a.
- the cell terminal 13p is the positive terminal and the cell terminal 13n is the negative terminal.
- the cell terminals 13p and 13n of the unit battery 13 have a generally rectangular parallelepiped three-dimensional shape that protrudes in the height direction from the upper end surface of the battery container 13a. Electrical insulation is provided between the cell terminals 13p, 13n and the battery container 13a and between the battery container 13a and the electrode group by insulating members made of resin.
- the cell positive terminal 13p of one unit battery 13 adjacent to each other and the cell negative electrode terminal 13n of the other unit battery 1 are adjacent to each other in the stacking direction (front-rear direction). are alternately reversed by 180° and laminated.
- the bus bar 20 is a connection conductor that electrically and mechanically connects the plurality of unit batteries 13 of the battery group 12 and electrically and mechanically connects the battery group 12 and the module terminals 10P and 10N.
- the busbars 20 that electrically and mechanically connect the plurality of unit batteries 1 of the battery group 12 are a plurality of busbars 20A that electrically and mechanically connect the unit batteries 13.
- the upper end surfaces of the cell terminals 13p and 13n of the plurality of unit batteries 13 of the exposed battery group 12 are joined by welding.
- the busbars 20 that connect the battery group 12 to the module terminals 10P and 10N are a pair of busbars 20B arranged at both ends of the unit cells 13 of the battery group 12 in the stacking direction.
- One 20B1 of the pair of busbars 20B is electrically and mechanically connected to the cell positive terminal 13p of one of the pair of unit batteries 13 arranged at both ends in the stacking direction of the plurality of unit batteries 13.
- the other 20B2 of the pair of busbars 20B is electrically and mechanically connected to the cell negative terminal 13n of the other unit battery 13 among the pair of unit batteries 13 arranged at both ends of the plurality of unit batteries 1 in the stacking direction. ing.
- One end 20B1 of the pair of busbars 20B is welded to the upper end face of the cell positive electrode terminal 13p of the unit battery 13, and the other end is a module positive electrode terminal 10P arranged on one side of the battery group 10 in the unit battery stacking direction. are fastened to each other by fastening members such as rivets and bolts.
- One end of the other 20B2 of the pair of bus bars 20B is welded to the upper end surface of the cell negative electrode terminal 13n of the unit cell 13, and the other end is a module negative electrode disposed on the other side in the stacking direction of the unit cells 13 of the battery group 12. It is fastened to the terminal 10N by fastening members such as rivets and bolts.
- the module cover 18 is a plate-shaped member made of resin having electrical insulation such as PBT, and is located on the opposite side of the housing 11 from the battery group 12 in the height direction (vertical direction) of the housing 11 . It is arranged on the upper end of the body 11 so as to cover the insulation cover 17 and the electronic circuit board. At positions corresponding to the module terminals 10P and 10N of the module cover 18, terminal covers 18a are provided so as to cover upper portions of the module terminals 10P and 10N.
- the module cover 18 is fixed to the upper portion of the insulation cover 17 by engaging engaging claws 17b provided on the frame portion 17a of the insulation cover 17 with the side edges.
- the battery module 10 is assembled and before being sealed by the module cover 18 .
- the module terminals 10P and 10N are electrically connected to an external generator or electric motor via an inverter device, which is a power conversion device. Power can be transferred to and received from an external generator or motor.
- FIG. 3 shows a configuration for explaining the concept of the embodiment of the present invention, showing a state before the temperature detector is inspected.
- the battery module 10 in this state as shown in FIG. 2, has most of the components assembled and is ready for inspection, and is in a state before the battery module 10 is sealed with the module cover 18. .
- the cell positive terminal 13p and the cell negative terminal 13n are provided on the upper surface of the battery container 13a that constitutes the unit battery 13 as described above.
- a planar region 21 is formed in which a detector (hereinafter referred to as thermistor) is arranged.
- the battery container 13a is made of a metal plate, and the temperature is easily transmitted to the thermistor arranged in the flat area 21.
- a thermistor may be provided in each battery container 13a, or a plurality of battery containers 13a may be grouped and a thermistor may be provided for each group.
- An insulation cover 17 is attached and fixed to the upper side of the side plate 16 integrated with the battery group 12 therebetween.
- the insulation cover 17 is formed with a terminal accommodating portion 22 for accommodating the cell positive terminal 13p and the cell negative terminal 13n.
- the insulation cover 17 is attached to the battery group 12, the cell positive terminal 13p and the cell negative terminal 13n are accommodated in the terminal accommodating portion 22. As shown in FIG.
- a housing recess 24 for housing the thermistor 23 is formed on the surface of the insulation cover 17 on the battery group 12 side.
- a spring means 25 is provided. Various forms (for example, coil springs, leaf springs, etc.) can be used for the spring means 25 .
- the thermistor 23 and the insulation cover 17 can be handled together.
- the handleability during assembly can be improved, and since an inspection through-hole 26, which will be described later, is also formed in the insulation cover 17, the positional relationship between the thermistor 23 and the inspection through-hole 26 is accurate. , and the routing of wiring is also facilitated.
- the thermistor 23 is also possible to install the thermistor 23 on the flat area 21 of the battery container 13a and press it with the resilient means 25 provided on the insulation cover 17 to contact it, as indicated by the dashed line. In any case, in the present embodiment, the thermistor 23 is in contact with the planar region 21 of the battery container 13a to secure the heat transfer path.
- the thermistor 23 is pressed against the planar region 21 on the upper surface of the battery container 13a by the resilient means 25 to form a heat transfer path.
- the heat of the flat area 21 is detected by the thermistor 23 and used for charge/discharge control of the battery module 10 .
- the thermistor 23 is pressed against the planar region 21 by the resilient means 25 to form a heat transfer path, but the contact state between the thermistor 23 and the planar region 21 of the battery container 13a may change for some reason. . For example, if the thermistor 23 makes contact with the plane region 21 in a one-sided manner, the heat transfer area is reduced, thereby causing a problem that the detection accuracy of the thermistor is lowered.
- the thermistor 23 may have its own failure or abnormality during the assembly process, and if the assembly is completed as it is, the battery module 10 itself will become a defective product.
- an inspection through hole 26 is formed in the insulation cover 17 adjacent to the thermistor 23 attached to the insulation cover 17 when the insulation cover 17 is viewed from above. there is Therefore, the inspection through-hole 26 and the thermistor 23 are inevitably arranged adjacent to each other with a predetermined distance therebetween.
- the planar region 21 of the battery container 13a has an inspection through hole 26 when viewed in a direction orthogonal to the planar region 21 of the battery container 13a. is orthographically projected onto the plane region 21 to form a virtual heat application region 27 .
- the inspection through-hole 26 is circular in this embodiment, the heat applying region 27 is also formed circular.
- the inspection through-hole 26 is not limited to a circular shape, and may be rectangular, elliptical, or polygonal with a pentagon or more.
- the thermistor 23 when the thermistor 23 is placed on the flat area 21, the thermistor 23 and the heat application area 27 do not overlap, and the positional relationship between the inspection through hole 26 formed in the insulation cover 17 and the thermistor 23 is maintained as it is. It reflects. For this reason, as will be described later, the thermistor 23 is located outside the heat applying region 27, so that contact between the heat applying means and the thermistor 23 can be avoided. If the heat applying means and the thermistor 23 were to come into direct contact with each other, the state of contact between the thermistor 23 and the planar region 21 of the battery container 13a would not be reflected.
- FIG. 4 and FIG. 5 the difference between FIG. 4 and FIG. 5 is that they have the same configuration except that the heat applying means is different.
- the assembled battery module 10 is prepared before the module cover 18 is attached.
- the insulation cover 17 is attached to the battery container 13 a , and the cell positive terminal 10 P and the cell negative terminal 13 n are housed in the terminal housing portion 22 of the insulation cover 17 .
- the thermistor 23 is pressed against the planar region 21 of the battery container 13a by the resilient means 25 and placed thereon.
- the temperature control member 28 which is a means for applying heat, passes through the inspection through-hole 26 and is moved until it comes into contact with the heat application area 27 . For this reason, the inspection through-hole 26 is formed in a shape large enough for the temperature control member 28 to pass through. Further, in this embodiment, the temperature control member 28 uses a resistance heating element, and is managed so as to apply a constant amount of heat energy to the battery container 13a. As a result, a stable amount of heat can be continuously applied directly to the planar region 21 of the battery container 13a.
- the heat applied to the heat applying region 27 is transmitted through the planar region 21 of the battery container 13a and reaches the thermistor 23.
- the thermistor 23 changes its electric resistance value according to the heat transferred, and measures the temperature. can do. That is, the temperature can be measured by converting the electrical resistance value detected by the thermistor 23 into temperature using the conversion table.
- heat energy can be directly applied to the battery container 13a, so a small amount of heat energy is sufficient and power consumption can be kept low. Further, since the thermistor 23 and the temperature control member 28, which is a heat source, are close to each other, the heat is immediately transmitted to the thermistor 23, and the operation of the thermistor can be confirmed in a short time. Furthermore, the temperature control member 28 is inserted into the inspection through-hole 26 formed in the insulation cover 17, heat is applied, and the temperature control member 28 is pulled out when the inspection is completed, which simplifies the inspection work.
- the electrical resistance of the thermistor 23 does not change even when heat is applied, it is possible to detect that the thermistor 23 itself has a failure or abnormality. Further, it is possible to detect whether or not the contact between the thermistor 23 and the planar region 21 of the battery case 13a is maintained in good condition, based on the amount of temperature change within a predetermined period of time. A method for determining contact between the thermistor 23 and the planar region 21 of the battery container 13a will be described later.
- the temperature control member 28 described above uses a resistance heating element to apply "heat" to the battery container 13a. can also be given. Also in this case, the inspection method is the same as the method described above.
- the thermistor 23 is not exposed to the heat applying region 27 formed by the inspection through-hole 26 so that the thermistor 23 and the temperature control member 28 do not interfere mechanically. Also, in order to reduce the heat energy and shorten the inspection time, it is necessary that the thermal resistance between the thermistor 23 and the heat applying region 27 is small. It is important that
- the positions of the thermistor 23 and the inspection through-hole 26 should be determined so as to satisfy such a condition.
- the inspection through-hole 26 and the thermistor 23 are inevitably adjacent to each other with a predetermined distance therebetween. will be placed.
- FIG. 5 differs from the embodiment of FIG. 4 in that a laser irradiation device 29 is used as heat application means.
- the assembled battery module 10 is prepared before the module cover 18 is attached.
- the insulation cover 17 is attached to the battery container 13 a , and the cell positive terminal 10 P and the cell negative terminal 13 n are housed in the terminal housing portion 22 of the insulation cover 17 .
- the thermistor 23 is pressed against the planar region 21 of the battery container 13a by the resilient means 25 and placed thereon.
- the laser irradiation member 29, which is a means for applying heat, is moved so as to be positioned on the upper surface of the through-hole 26 for inspection.
- the inspection through-hole 26 is formed to have a size that allows the laser beam 30 from the laser irradiation member 29 to reach the planar region 21 without interfering with the insulation cover 17 or the like.
- it is managed so that a fixed amount of light energy is given to the battery container 13a. As a result, stable light energy can be continuously applied directly to the planar region 21 of the battery container 13a in a non-contact manner.
- the laser light 30 applied to the heat applying region 27 is converted into heat, and propagates through the planar region 21 of the battery container 13a to reach the thermistor 23.
- the thermistor 23 changes its resistance value in accordance with the transferred heat. Changing temperature can be measured. That is, the temperature can be measured by converting the output voltage from the thermistor 23 using the conversion table.
- the present embodiment light energy can be directly applied to the battery container 13a, so a small amount of light energy is sufficient, and power consumption can be kept low.
- the thermistor 23 and the irradiation position of the laser irradiation member 29, which is a heat source are close to each other, the heat is immediately transmitted to the thermistor 23, and the operation of the thermistor can be confirmed in a short time.
- the laser irradiation member 29 is moved to the upper surface of the inspection through-hole 26 formed in the insulation cover 17 to irradiate the laser beam 30, and when the inspection is completed, the laser irradiation member 29 is moved, so the inspection work is easy. becomes.
- the thermistor 23 does not generate an output voltage even when heat is applied by the laser beam 30, it is possible to detect that the thermistor 23 itself has a failure or abnormality. Further, it is possible to detect whether or not the contact between the thermistor 23 and the planar region 21 of the battery case 13a is maintained in good condition, based on the amount of temperature change within a predetermined period of time.
- Figure 6 shows the configuration of the inspection system required for inspection. 6, the configuration and arrangement positions of the battery container 13a, the temperature control member 28, and the thermistor 23 are the same as those shown in FIG.
- the temperature control member control unit 32 provided in the inspection control device 31 executes heating control of the temperature control member 28 via the wiring 32L. It controls the amount of heating energy, etc.
- the output voltage of the thermistor 23 generated by this heating is input to the temperature measurement unit 33 provided in the inspection control device 31 at predetermined time intervals via the wiring 23L, and converted into temperature information.
- the temperature information can be obtained by using the "output voltage-temperature table". This temperature information is stored in a RAM area (not shown) of the inspection control device 31 at predetermined time intervals.
- the inspection control device 31 is provided with a temperature change value calculation unit 34, which calculates how much the temperature of the thermistor 23 changes (difference) during a predetermined period of time. ⁇ Tact) is input to the diagnostic unit 36 in the subsequent stage. This actual temperature change value ( ⁇ Tact) can be obtained by reading the temperature information stored in the RAM area.
- the temperature information (T1) stored at a certain time and the temperature information (T2) stored at a time after a predetermined time from the time at which the temperature information (T1) was obtained can be obtained by subtraction processing. can.
- the actual temperature change value ( ⁇ Tact) will be described with reference to FIG.
- the temperature control member controller 32 stops heating by the temperature control member 28.
- the inspection control device 31 includes a storage unit 35 made up of a flash ROM or the like.
- the storage unit 35 stores a temperature change threshold value ( ⁇ Tref). This is used as a reference value for judging whether or not the flat area 21 of the battery container 13a is kept in good contact.
- This temperature change threshold value ( ⁇ Tref) is input to the diagnostic unit 36 at the subsequent stage.
- the temperature change threshold ( ⁇ Tref) will be described with reference to FIG.
- the diagnosis section 36 of the inspection control device 31 determines whether or not the contact between the thermistor 23 and the planar region 21 of the battery container 13a is well maintained, the result is sent to the output section 37 and displayed on a display or the like. Therefore, the operator can grasp the diagnosis result of the output unit 37 .
- the worker attaches the module cover 18 to complete the assembly work.
- the operator corrects the mounting state of the thermistor 23 on the insulation cover 17, assembles again, and performs the same inspection. run again.
- FIG. 7 explains how to obtain the actual temperature change value ( ⁇ Tact) and the temperature change threshold value ( ⁇ Tref).
- the horizontal axis indicates the elapsed time, and the vertical axis indicates the measured temperature of the thermistor 23 .
- the solid line indicates the actual temperature, and the dashed line indicates the temperature when the contact state between the thermistor 23 and the planar region 21 is intentionally set to be bad. The temperature indicated by the dashed line is used to determine the temperature change threshold ( ⁇ Tref) discussed above.
- the temperature control member 28 starts heating at time (t0)
- the temperature of the thermistor 23 rises as indicated by the solid line, and the temperature information measured by the thermistor at time (t1) is obtained.
- the actual temperature at this time is the temperature (T1).
- the temperature information measured by the thermistor is obtained again.
- the actual temperature at this time is the temperature (T2).
- the temperature (T1) at time (t1) is subtracted from the temperature (T2) at time (t2) to obtain the actual temperature change value ( ⁇ Tact).
- the temperature change threshold ( ⁇ Tref) is obtained in advance by means of experiments and simulations.
- the contact state between the thermistor 23 and the planar region 21 of the battery case 13a is a pass contact state (normal contact state) where the temperature information of the thermistor 23 is determined to be sufficiently reliable. ), it is determined on the assumption of an unacceptable contact state (abnormal contact state) in which the temperature information is slightly smaller.
- step S16 the heating of the temperature control member 28 is stopped after the actual temperature (T1) and the actual temperature (T2) are measured and stored in the RAM area. is preferred. As a result, it is possible to prevent excessive power consumption and to prevent the thermistor 23 from being heated more than necessary.
- the conditions for temperature change measurement will match. judgment can be made.
- the temperature change speed may be determined by calculating (T2-T1)/(t2-t1). Using the temperature change rate in this manner can reduce the influence of variations and the like, so that more accurate determination can be performed.
- This control flow is started when an inspection is to be performed (in which the inspection control apparatus is instructed to start inspection), and is thereafter executed at predetermined time intervals.
- Step S10 In step S10, at time (t0) in FIG. 7, the temperature control member 28 is brought into contact with the planar region 21 of the battery container 13a to start heating. When heating is started, the process proceeds to step S11.
- step S11 temperature information (T1) is acquired from the thermistor 23 at time (t1) after a predetermined time has elapsed from time (t0) in FIG. 7, and is stored in a predetermined area of the RAM.
- T1 temperature information
- step S12 temperature information (T2) is acquired from the thermistor 23 at time (t2) after a predetermined time has elapsed from time (t1) in FIG. 7, and is stored in a predetermined area of the RAM.
- T2 temperature information
- step S13 the temperature information (T1) is detected in step S11, the temperature information (T2) is detected in step S12, and the first temperature (T1) and the second temperature (T2) are already stored in the RAM area. Since it is stored, there is no need to heat the temperature control member 28, so the heating of the temperature control member 28 is stopped. After stopping the heating of the temperature control member 28, the process proceeds to step S14. As a result, it is possible to prevent excessive power consumption and to prevent the thermistor 23 from being heated more than necessary.
- step S14 the temperature information (T1) stored in the RAM area and the temperature information (T2) stored in the RAM area are read, the actual temperature change value ( ⁇ Tact) is calculated, and stored in a new RAM area. .
- step S15 the temperature change threshold value ( ⁇ Tref) stored in the flash ROM for comparison and judgment to be executed in the next step is read out and stored in the RAM area. After reading out the temperature change threshold value ( ⁇ Tref), the process proceeds to step S16.
- step S16 the actual temperature change value ( ⁇ Tact) obtained in step S14 is compared with the temperature change threshold value ( ⁇ Tref) obtained in step S15. If the actual temperature change value ( ⁇ Tact) is large, the process proceeds to step 17, and if the actual temperature change value ( ⁇ Tact) is small, the process proceeds to step 18.
- a large actual temperature change value indicates that the heat from the temperature control member 28 is well transferred to the thermistor 23 . In other words, it means that the contact state between the thermistor 23 and the planar region 21 of the battery container 13a is normal.
- step S17 it is determined that the contact state between the thermistor 23 and the planar region 21 of the battery container 13a is good. Therefore, in step S17, a display (OK display). When the display indicating normality (OK display) is executed, the process proceeds to step S19.
- step S18 a display indicating that there is an abnormality (NG display).
- NG display a display indicating that there is an abnormality
- the processing is terminated by going to the end.
- the operator corrects the mounting state of the thermistor 23 on the insulation cover 17, reassembles the insulation cover 17, and conducts the same inspection. again.
- step S19 assuming that the thermistor 23 and the planar region 21 of the battery container 13a are kept in good contact, the internal resistance of the battery group 12 is finally measured to check the resistance value. When this check is completed, the process exits to end. In this case, the contact between the thermistor 23 and the flat area 21 of the battery container 13a is maintained well, and the internal resistance of the battery group 12 is normal. mounting to the ration cover 17 to complete the assembly of the battery module 10.
- step S14 the process of obtaining the actual temperature change value ( ⁇ Tact) in step S14 and the process of obtaining the temperature change threshold value ( ⁇ Tref) in step S15 may be reversed in order. Further, the process of ending heating in step S13 may be executed between steps S14 to S18.
- the "thermistor inspection" in steps S10 to S18 and the “battery resistance inspection” in step S19 can be performed completely and independently. This allows the inspection work to be performed accurately.
- the battery 13 including the battery container 13a containing the battery element, the thermistor 23 in contact with and thermally connected to the outer surface of the battery container 13a, and a part of the battery container 13a and presses the thermistor 23 against the battery container 13a. is formed, and the thermistor 23 is arranged at a position outside the heat application region in which the inspection through-hole 26 is projected onto the plane portion 21 of the battery container 13a.
- the temperature in the vicinity of the thermistor 23 is reduced by directly heating or cooling the heat application region by the heat application means 28 and 29 through the inspection through hole 26 provided in the insulation cover 17. It can be raised or lowered in a short time, and efficient inspection can be performed.
- the inspection through-hole 26 may be closed by a lid (not shown) provided on the insulation cover 17, or the insulation cover 17 does not have a lid and is shielded from the outside by the module cover 18. It's okay to be there.
- the module cover 18 facing the insulation cover 17 is also provided with an inspection through-hole. It is also possible to apply heat to the battery container 13 at . According to this, the inspection can be performed after the assembly of the battery module 10 is completed.
- the feature of this embodiment is that the heat application mark 38 is provided in the heat application area 27 .
- the heat application region 27 corresponding to the inspection through-hole 26 there is a location where the heat application portion is the best. For example, considering the heat transfer efficiency, it is the portion closest to the thermistor 23 .
- a heat application mark 38 is formed at a portion closest to the thermistor 23 placed on the planar area.
- the heat-applying indicia 38 are selected from, for example, sinkholes, dimples, protrusions, and colored coatings.
- the sinkholes, dimples and protrusions are preferably formed integrally with the planar region 21 by deforming the planar region 21 . This is because inhibition of heat conduction to the thermistor 23 due to the presence of the heat imparting mark 38 can be suppressed more than in a structure in which the heat imparting mark 38 is made of a material different from that of the planar region 21 .
- there is an advantage that the processing cost of the mark 38 for heat application can be kept low. By providing such a mark 38 for applying heat, the positioning of the temperature control member 28 can be facilitated, and the inspection work can be simplified.
- the heat application mark 38 can be painted black to speed up the temperature rise.
- the laser irradiation member 29 is simply placed on the outer upper portion of the insulation cover 17, it is not necessary to insert the temperature control member 28 into the inspection through-hole 26, making it possible to simplify the inspection work.
- the feature of this embodiment is that the protective sheet 39 is provided on the planar region 21 of the upper surface of the battery container 13a, but the protective sheet 39 is not provided on the portion of the heat application region 27.
- a protective sheet 39 is attached to the planar region 21 of the battery container 13a for insulation and protection.
- the protective sheet 39 is laid on the planar region 21 of the battery container 13a except for the portion surrounding the cell positive terminal 13p, the cell negative terminal 13n, and the thermistor 23. As shown in FIG. This insulates and protects the upper surface side of the battery container 13a.
- the protective sheet 39 is not laid in the heat applying region 27 corresponding to the inspection through-hole 26 so as not to lower the heat transfer efficiency. Therefore, the protective sheet 39 does not prevent the heating of the heat applying region 27 by the temperature control member 28 and the laser irradiation member 29 . As described above, since the protective sheet 39 does not hinder the transfer of heat, it is possible to improve the inspection accuracy and shorten the inspection time.
- a feature of this embodiment is that the lead wire of the thermistor 23 is placed on the upper surface of the insulation cover 17, that is, the surface opposite to the battery group 12.
- the insulation cover 17 of the present embodiment is formed in a plate-like shape having a flat portion as a whole. It is considered to be covered.
- one end of the insulation cover 17 is formed with an opening 40 having a predetermined size.
- the insulation cover 17 has a plate shape having a flat portion as a whole, and extends longitudinally along the stacking direction of the battery group 12 .
- the battery group 12 is covered with an insulation cover 17 .
- the opening 40 is opened in a direction orthogonal to the stacking direction of the battery group 12. Through this opening 40, a battery voltage detection terminal holder 41 made of synthetic resin and the thermistor voltage detection terminal are connected. The retainer 42 is exposed. A cover portion 43 also made of synthetic resin is attached to the opening 40 so as to close the opening except for the battery voltage detection terminal holder 41 and the thermistor voltage detection terminal holder 42 .
- the battery voltage detection terminal holder 41 is attached with a battery voltage detection wire housing portion 45 for housing a battery voltage detection wire 44 which is a signal lead wire.
- a thermistor voltage detection line housing portion 47 for housing a certain thermistor voltage detection line 46 is attached.
- the battery voltage detection line 44 is connected to the socket 48 and the thermistor voltage detection line 46 is also connected to the socket 49 .
- the sockets 48 and 49 are fixed to the upper surface of the insulation cover 17 by appropriate fixing means (bolts, adhesion, engaging mechanisms, etc.).
- the socket 48 is connected to the battery control device provided in the battery module 10, and the socket 49 is connected to the inspection control device 31 (see FIG. 6).
- the inspection through-hole 26 is also formed along this direction.
- the inspection through-holes 26 are intermittently formed in two rows in the vicinity of both end surfaces of the insulation cover 17 in the width direction.
- the above-described opening 40 Between the two rows of inspection through-holes 26, the above-described opening 40, battery voltage detection terminal holder 41, thermistor voltage detection terminal holder 42, lid 43, battery voltage detection line 44, and battery voltage detection are provided.
- the upper surface of the insulation cover 17 can be efficiently used.
- a temperature control member 50 is attached in a heat transferable manner at a position corresponding to the heat application area 27 shown in FIG.
- the temperature control member 50 is arranged at a position corresponding to the heat applying region 27 as an example, the point is that if the temperature control member 50 and the thermistor 23 are not in mechanical contact, the thermistor 23 and Since it is possible to judge whether the contact state of the flat area 21 is good or bad, it is not necessary to be the heat application area 27 . However, it is preferable to arrange them as close as possible.
- the temperature control member 50 is made of a heating element with electrical resistance, and can be one using a nichrome wire, one using a PTC element, or one using a semiconductor element. It goes without saying that heat generating elements other than these can be used, and a Peltier element or the like that gives cold heat can also be used.
- the temperature control member 50 is arranged in the flat area 21 on the upper surface of the battery container 13a. Therefore, by connecting the wiring 51 of the thermistor 23 and the wiring of the temperature control member 50 to the inspection control device 53, it is possible to obtain the same functions and effects as those of the above-described embodiment.
- the inspection control device 53 is the same as the inspection control device 31 shown in FIG. 6, and the contact determination method of the thermistor 23 is also the same as the control flow shown in FIG.
- heat energy can be directly applied to the battery container 13a by the temperature control member 50, so a small amount of heat energy is sufficient and power consumption can be kept low.
- the thermistor 23 and the temperature control member 50 are close to each other, heat is immediately transmitted to the thermistor 23, so that it is possible to check the operation of the thermistor in a short time.
- the thermistor 23 does not generate an output voltage even when heat is applied by the temperature control member 50, it can be detected that the thermistor 23 itself has a failure or abnormality. Further, it is possible to detect whether or not the contact between the thermistor 23 and the planar region 21 of the battery case 13a is maintained in good condition, based on the amount of temperature change within a predetermined period of time.
- the inspection control device 53 provided outside determines whether the contact state between the thermistor 23 and the plane area 21 is good or bad. However, it is also possible to determine whether the contact state between the thermistor 23 and the flat area 21 is good or bad on-board by a battery control device provided in the battery module 10 instead of the inspection control device 53 .
- the same reference numerals as those in FIG. 13 denote components having the same functions, and description thereof will be omitted if not necessary.
- a battery control device (which can be rephrased as a heat application control device) 54 is arranged between the insulation cover 17 and the module cover 18 . That is, the battery control device 54 is arranged on the opposite side of the insulation cover 17 to the battery group 12 (see FIG. 2) in the height direction of the housing 11 (see FIG. 1), and is connected to lead wires and printed wiring. It is electrically connected to a plurality of busbars 20 (see FIG. 2), thermistors 23, temperature control members 50, and the like via connection conductors such as. Incidentally, the battery control device 54 can be attached to the insulation cover 17 or the module cover 18 .
- the battery control device 54 has a function of controlling charging and discharging of the battery module 10, but since this is not related to the present invention, its explanation is omitted. Furthermore, the battery control device 54 has a function of judging whether the contact state between the thermistor 23 and the flat area 21 is good or bad.
- FIG. 15 shows its functional block, and its function is almost the same as that shown in FIG.
- a temperature control member control unit 55 provided in the battery control device 54 executes heating control of the temperature control member 50 via the wiring 52, and includes a heating start time, a heating time, a heating end time, It controls the amount of heating energy, etc.
- the output voltage of the thermistor 23 generated by this heating is input to the temperature measuring section 56 provided in the battery control device 54 at predetermined time intervals via the wiring 51 and converted into temperature information.
- the temperature information can be obtained by using the "output voltage-temperature table". This temperature information is stored in a RAM area (not shown) of the battery control device 54 at predetermined time intervals.
- the battery control device 54 is provided with a temperature change calculator 57, which calculates how much the temperature of the thermistor 23 changes (difference) during a predetermined period of time. ) is input to the diagnostic unit 58 in the subsequent stage.
- This actual temperature change value ( ⁇ Tact) can be obtained by reading the temperature information stored in the RAM area. can be obtained by subtracting the temperature information (T2) stored at the time after a predetermined time from .
- the battery control device 54 includes a storage unit 59 composed of a flash ROM or the like, and the storage unit 59 stores a temperature change threshold ( ⁇ Tref). This is used as a reference value for judging whether or not the flat area 21 of the battery container 13a is kept in good contact.
- This temperature change threshold value ( ⁇ Tref) is input to the diagnostic unit 58 at the subsequent stage.
- the temperature change threshold ( ⁇ Tref) is as described with reference to FIG.
- the diagnosis section 58 of the battery control device 54 determines whether or not the contact between the thermistor 23 and the flat area 21 of the battery container 13a is well maintained, the result is sent to the storage section 59 and stored. In this case, an error code is stored, and the operator can grasp the diagnosis result by reading this error code with a dedicated inspection device.
- FIG. 16 is a control flow for determining whether the thermistor 23 in the battery control device 54 and the flat area 21 of the battery container 13a are kept in good contact. Since most of the control steps are the same as the control flow in FIG. 8, descriptions of the same control steps are omitted.
- heat energy can be directly applied to the battery container 13a by the temperature control member 50, so that a small amount of heat energy is sufficient and power consumption can be kept low.
- the thermistor 23 and the temperature control member 50 are close to each other, heat is immediately transmitted to the thermistor 23, so that it is possible to check the operation of the thermistor in a short time.
- the thermistor 23 does not generate an output voltage even when heat is applied by the temperature control member 50, it can be detected that the thermistor 23 itself has a failure or abnormality. Further, it is possible to detect whether or not the contact between the thermistor 23 and the planar region 21 of the battery case 13a is maintained in good condition, based on the amount of temperature change within a predetermined period of time.
- the battery control device 54 determines whether or not the contact between the thermistor 23 and the planar region 21 of the battery container 13a is well maintained.
- the above-described diagnosis can be performed at any timing.
- the control flow shown in FIG. 16 can be executed at the time of shipment or every time a predetermined time elapses after installation in the vehicle.
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Abstract
Description
ステップS10においては、図7の時刻(t0)において、温調部材28を電池容器13aの平面領域21に接触させ、加熱を開始する。加熱を開始するとステップS11に移行する。
ステップS11においては、図7の時刻(t0)から所定時間が経過した時刻(t1)において、サーミスタ23から温度情報(T1)を取得し、RAMの所定領域に記憶する。温度情報(T1)を取得するとステップS12に移行する。
ステップS12においては、図7の時刻(t1)から所定時間が経過した時刻(t2)において、サーミスタ23から温度情報(T2)を取得し、RAMの所定領域に記憶する。温度情報(T2)を取得するとステップS13に移行する。
ステップS13においては、ステップS11で温度情報(T1)を検出し、ステップS12で温度情報(T2)を検出して、既にRAM領域に第1の温度(T1)と第2の温度(T2)が記憶されているので、温調部材28を加熱する必要がないため温調部材28の加熱を停止する。温調部材28の加熱を停止すると、ステップS14に移行する。これによって、余分な電力を消費しないようにすることができ、また、サーミスタ23を必要以上に加熱しないようにすることができる。
ステップS14においては、RAM領域に記憶された温度情報(T1)とRAM領域に記憶された温度情報(T2)を読み出し、実温度変化値(ΔTact)を算出して、新たなRAM領域に記憶する。尚、算出式は、「ΔTact=T2-T1」である。実温度変化値(ΔTact)を算出するとステップS14に移行する。
ステップS15においては、次のステップで実行する比較判断のためのフラッシュROMに記憶された温度変化閾値(ΔTref)を読み出し、RAM領域に記憶する。温度変化閾値(ΔTref)を読み出すとステップS16に移行する。
ステップS16においては、ステップS14で求めた実温度変化値(ΔTact)と、ステップS15で求めた温度変化閾値(ΔTref)とを比較演算する。実温度変化値(ΔTact)が大きいとステップ17に移行し、実温度変化値(ΔTact)が小さいとステップ18に移行する。
ステップS16で、サーミスタ23と電池容器13aの平面領域21の接触状態が良好であると判断されているので、ステップS17においては、出力部37の表示装置に、正常であることを示す表示(OK表示)を実行する。正常であることを示す表示(OK表示)を実行すると、ステップS19に移行する。
一方ステップS16で、サーミスタ23と電池容器13aの平面領域21の接触状態が良好でないと判断されているので、ステップS17においては、出力部37の表示装置に、異常であることを示す表示(NG表示)を実行する。異常であることを示す表示(NG表示)を実行すると、エンドに抜けて処理を終了する。この場合は、サーミスタ23と電池容器13aの平面領域21の接触が良好に保たれていないので、作業者はインシュレーションカバー17のサーミスタ23の取り付け状態を修正し、再び組み付けをやり直して同様の検査を再び実行する。
ステップS19においては、サーミスタ23と電池容器13aの平面領域21の接触が良好に保たれているとして、最終的に電池群12の内部抵抗を測定して抵抗値のチェックを行う。このチェックが完了すると、エンドに抜けて処理を終了する。この場合は、サーミスタ23と電池容器13aの平面領域21の接触が良好に保たれている、及び電池群12の内部抵抗も正常であると判断されているので、作業者はモジュールカバー18をインシュレーションカバー17に取り付け、電池モジュール10の組み立てを完了する。
図8に示す制御フローと実質的に同じであるので説明を省略する。ただ、図8の制御ステップS10では、温調部材28が使用されているが、図16の制御ステップS10では、温調部材50を用いる点で異なっている。
ステップS16で、サーミスタ23と電池容器13aの平面領域21の接触が良好に保たれていないと判断されると、ステップS20においては、エラーコードを記憶部59に記憶する。記憶部59は、フラッシュROMから構成されているので、電源がシャットダウンされても、エラーコードを喪失することがない。エラーコードを記憶すると、エンドに抜けて処理を終了する。
Claims (23)
- 電池要素を収納した電池容器を備えた電池と、
前記電池容器の外表面に接触して前記電池容器と熱的に接続された温度検出器と、
前記電池容器の一部を覆うと共に、前記温度検出器を前記電池容器に接触させる電気絶縁性と剛性を備えた被覆部材とを有し、
前記被覆部材には、熱付与手段が通過する検査用貫通孔が形成され、前記温度検出器は、前記検査用貫通孔を前記電池容器の前記外表面に正射投影した熱付与領域の外側の位置に配置されている
ことを特徴とする電池モジュール。 - 請求項1に記載の電池モジュールであって、
前記温度検出器は、前記電池容器に設けられたセル正極端子とセル負極端子の側の前記外表面に配置され、
前記被覆部材は、前記温度検出器を覆うように配置され、前記温度検出器は、前記検査用貫通孔によって形成される前記熱付与領域に隣接して配置されている
ことを特徴とする電池モジュール。 - 請求項2に記載の電池モジュールであって、
前記温度検出器は、前記被覆部材に形成した前記検査用貫通孔に隣接した位置で、前記被覆部材に設けられている
ことを特徴とする電池モジュール。 - 請求項2に記載の電池モジュールであって、
前記熱付与手段は、前記熱付与領域に接触して温熱、或いは冷熱を前記電池容器に伝熱させる
ことを特徴とする電池モジュール。 - 請求項4に記載の電池モジュールであって、
前記熱付与手段は、抵抗発熱体から作られており、前記熱付与領域と接触して前記電池容器に熱を伝える
ことを特徴とする電池モジュール。 - 請求項2に記載の電池モジュールであって、
前記熱付与手段は、前記熱付与領域に非接触で熱を前記電池容器に与える
ことを特徴とする電池モジュール。 - 請求項6に記載の電池モジュールであって、
前記熱付与手段は、レーザー照射部材から作られており、前記熱付与領域にレーザー光を照射して前記電池容器に熱を与える
ことを特徴とする電池モジュール。 - 請求項2~請求項7のいずれか1項に記載の電池モジュールであって、
前記熱付与領域には、熱付与用目印が設けられている
ことを特徴とする電池モジュール。 - 請求項2~請求項7のいずれか1項に記載の電池モジュールであって、
前記電池容器の前記温度検出器、前記セル正極端子、及び前記セル負極端子が位置する側の領域には、前記熱付与領域を除いて保護シートが敷設されている
ことを特徴とする電池モジュール。 - 請求項2~請求項7のいずれか1項に記載の電池モジュールであって、
複数の前記電池が一つの方向に積層されて電池群を形成し、
前記被覆部材は、前記電池群を覆うように前記一つの方向に延びていると共に、所定の位置で開口した開口部を備え、前記開口部から前記温度検出器の信号引出線が引き出され、前記信号引出線は前記被覆部材の前記一つの方向に沿って配置されている
ことを特徴とする電池モジュール。 - 請求項10に記載の電池モジュールであって、
前記被覆部材には、前記一つの方向に直交する方向の両端で、前記一つの方向に沿って間欠的に連続して2列の前記検査用貫通孔が形成されており、2列の前記検査用貫通孔の間に、前記信号引出線が配置されている
ことを特徴とする電池モジュール。 - 請求項11に記載の電池モジュールであって、
前記信号引出線は、前記被覆部材に固定されたソケットに接続されている
ことを特徴とする電池モジュール。 - 電池モジュールの検査方法であって、
請求項1~請求項9のいずれか1項に記載の電池モジュールの前記電池容器の前記熱付与領域に、前記検査用貫通孔を通して前記熱付与手段によって熱を付与する熱付与工程と、
前記熱付与工程の後に、所定時間が経過した後の前後の前記温度検出器からの温度変化値を求める温度変化値測定工程と、
温度変化値測定工程の後に、予め定めた温度変化閾値と前記温度変化値を比較し、前記温度変化値が前記温度変化閾値より大きいと前記温度検出器と前記電池容器の接触状態が正常と判断し、前記温度変化値が前記温度変化閾値より小さいと前記温度検出器と前記電池容器の接触状態が異常と判断する診断工程と
を実行することを特徴とする電池モジュールの検査方法。 - 電池モジュールの検査方法であって、
請求項1~請求項9のいずれか1項に記載の電池モジュールの前記電池容器の前記熱付与領域に、前記検査用貫通孔を通して前記熱付与手段によって熱を付与する熱付与工程と、
前記熱付与工程の後に、所定時間が経過した後の前後の前記温度検出器からの温度変化値から温度変化速度値を求める温度変化速度測定工程と、
温度変化速度測定工程の後に、予め定めた温度変化速度閾値と前記温度変化速度値を比較し、前記温度変化速度値が前記温度変化速度閾値より大きいと前記温度検出器と前記電池容器の接触状態が正常と判断し、前記温度変化速度値が前記温度変化速度閾値より小さいと前記温度検出器と前記電池容器の接触状態が異常と判断する診断工程と
を実行することを特徴とする電池モジュールの検査方法。 - 請求項13に記載の電池モジュールの検査方法であって、
前記温度変化閾値は、前記温度検出器と前記電池容器の前記外表面との接触が良好に保たれているかどうかの判断を行う判断基準値である
ことを特徴とする電池モジュールの検査方法。 - 請求項14に記載の電池モジュールの検査方法であって、
前記温度変化速度閾値は、前記温度検出器と前記電池容器の前記外表面との接触が良好に保たれているかどうかの判断を行う判断基準値である
ことを特徴とする電池モジュールの検査方法。 - 請求項13、或いは請求項14に記載の電池モジュールの検査方法であって、
前記熱付与工程で使用される前記熱付与手段は、前記熱付与領域に接触して温熱、或いは冷熱を前記電池容器に伝熱させる
ことを特徴とする電池モジュールの検査方法。 - 請求項17に記載の電池モジュールの検査方法であって、
前記熱付与手段は、抵抗発熱体から作られており、前記熱付与領域と接触して前記電池容器に熱を伝える
ことを特徴とする電池モジュールの検査方法。 - 請求項13、或いは請求項14に記載の電池モジュールの検査方法であって、
前記熱付与工程で使用される前記熱付与手段は、前記熱付与領域に非接触で熱を前記電池容器に与える
ことを特徴とする電池モジュールの検査方法。 - 請求項19に記載の電池モジュールの検査方法であって、
前記熱付与手段は、レーザー照射部材から作られており、前記熱付与領域にレーザー光を照射して前記電池容器に熱を与える
ことを特徴とする電池モジュールの検査方法。 - 請求項13乃至請求項20のいずれか1項に記載の電池モジュールの検査方法であって、
前記診断工程の後で前記電池の内部抵抗を測定して前記電池の良否を判別する内部抵抗診断工程を実行する
ことを特徴とする電池モジュールの検査方法。 - 電池要素を収納した電池容器を備えた電池と、
前記電池容器の外表面に接触して前記電池容器と熱的に接続された温度検出器と、
前記電池容器の一部を覆うと共に、前記温度検出器を前記電池容器に接触させる電気絶縁性と剛性を備えた被覆部材とを有し、
前記電池容器の外表面には、前記温度検出器に近接して配置された熱付与手段が設けられ、前記熱付与手段は熱付与制御装置によって制御されると共に、
前記熱付与制御装置は、
前記熱付与手段によって前記温度検出器に熱を付与する熱付与機能部と、
前記熱付与機能部によって熱を付与した後に、所定時間が経過した後の前後の前記温度検出器からの温度変化値を求める温度変化値測定機能部と、
予め定めた温度変化閾値と前記温度変化値を比較し、前記温度変化値が前記温度変化閾値より大きいと前記温度検出器と前記電池容器の接触状態が正常と判断し、前記温度変化値が前記温度変化閾値より小さいと前記温度検出器と前記電池容器の接触状態が異常と判断する診断機能部とを備えている
ことを特徴とする電池モジュール。 - 請求項22に記載の電池モジュールであって、
前記被覆部材の外側には、前記被覆部材を覆う外側被覆部材が設けられており、前記被覆部材と前記外側被覆部材の間に前記熱付与制御装置が配置されている
ことを特徴とする電池モジュール。
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