JP2012195143A - Battery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery system capable of easily detecting an abnormality occurring at a battery pack case.SOLUTION: A battery system includes a battery pack having a plurality of solid unit cells, a battery pack case housing the unit cells, and gas filled in the battery pack case, and the unit cells are pressurized using hydrostatic pressure produced within the battery pack case by the gas. The battery system is provided with: a deformation means causing deformation at a part of the battery pack case upon occurrence of an abnormality at the battery pack case; and a detection means detecting the deformation.

Description

  The present invention relates to a battery system that pressurizes a battery cell accommodated in a housing.

  In recent years, the demand for secondary batteries as a power source has expanded from small devices such as mobile phones to large devices such as automobiles, and the performance has been improved, and in particular, the capacity has been increased.

  The secondary battery used for the above application includes at least a positive electrode and a negative electrode, and an electrolyte interposed between the positive electrode and the negative electrode. Among these, the electrolyte is a medium that conducts ions between the positive electrode and the negative electrode, and a liquid electrolyte or a solid electrolyte is used.

  When a liquid electrolyte (hereinafter sometimes referred to as “electrolytic solution”) is used as the electrolyte of the secondary battery, the electrolytic solution easily permeates into the positive electrode layer and the negative electrode layer. Therefore, an interface between the active material contained in the positive electrode layer or the negative electrode layer and the electrolytic solution is easily formed, and the performance is easily improved. However, since widely used electrolytes are generally flammable, it is necessary to take measures to ensure safety. In addition to this, it is necessary to take measures to prevent the electrolyte from leaking out of the casing (liquid leakage).

  On the other hand, in a battery using a solid electrolyte (hereinafter, sometimes referred to as “solid electrolyte”), there is no risk of the liquid leakage. Also, the solid electrolyte is generally flame retardant. Therefore, the above measures can be simplified or omitted. Therefore, a secondary battery (hereinafter, referred to as “solid battery”) having a layer containing a flame retardant solid electrolyte (hereinafter sometimes referred to as “solid electrolyte layer”) may be used. ) Has been proposed. Furthermore, in order to reduce the internal resistance, a technique for reducing the interfacial resistance by applying pressure in the direction in which the positive electrode layer, the solid electrolyte layer, and the negative electrode layer are laminated so as to make the respective layers adhere more strongly is presented. Yes.

  As a technique related to such a battery, for example, Patent Document 1 discloses a combination of a negative electrode and a positive electrode capable of inserting and removing lithium, a nonaqueous electrolyte, and a plurality of unit cells (battery cells) configured by a case storing them. In an assembled battery housed in an assembled battery case (housing), outside the unit cell case, the space inside the assembled battery case is filled with at least one kind of gas, liquid, solid powder, or a mixture thereof. Thus, a lithium ion secondary battery is disclosed in which the unit cell is pressurized using the hydrostatic pressure generated in the assembled battery case. According to the battery disclosed in Patent Document 1, since the unit cell is pressurized using the hydrostatic pressure generated in the case, it is possible to suppress a situation in which the pressure applied to each unit cell varies. Therefore, since a situation (local degradation) in which some of the unit cells deteriorate faster than other unit cells can be suppressed, it is said that the performance degradation of the assembled battery as a whole, particularly the cycle characteristics, can be reduced.

JP-A-10-214638 JP 2006-128122 A JP 2007-66612 A

  In a battery that pressurizes a unit cell using such hydrostatic pressure, the internal resistance of the unit cell can vary depending on the value of the pressure received by the unit cell. Therefore, in order to improve the performance of the battery, the hydrostatic pressure inside the assembled battery case is preferably set to a certain value or more. On the other hand, from the viewpoint of improving the safety of the battery, the hydrostatic pressure is preferably set to a certain value or less. Therefore, it is required to manage the hydrostatic pressure in the assembled battery case within a predetermined range. In the battery disclosed in Patent Document 1, the hydrostatic pressure in the assembled battery case is managed by separately preparing a sealed casing with a strain gauge attached thereto and placing the sealed casing in the assembled battery case. This is done by measuring the amount. However, managing the hydrostatic pressure by such a method has a problem of complicating the system and increasing the cost. Such a problem is difficult to solve even when the techniques described in Patent Document 2 and Patent Document 3 are combined.

  Then, this invention makes it a subject to provide the battery system which can detect simply the abnormality which generate | occur | produced in the assembled battery case.

In order to solve the above problems, the present invention takes the following means. That is,
The present invention includes an assembled battery having a plurality of solid unit cells, an assembled battery case that houses the assembled battery, and a gas filled in the assembled battery case, and the hydrostatic pressure generated in the assembled battery case by the gas A battery system that pressurizes a unit cell using a battery, and includes a deforming unit that deforms a part of the assembled battery case when an abnormality occurs in the assembled battery case, and a detecting unit that detects the deformation. This is a battery system.

  Here, in the present invention, the “unit cell” is a concept that means a unit cell having a pair of electrode layers and an electrolyte layer disposed between the pair of electrode layers. Is a concept that does not include an assembly of connected and / or stacked layers. “A pair of electrode layers” means a pair of a positive electrode layer and a negative electrode layer. “Arranged between” means that an electrolyte layer exists between the positive electrode layer and the negative electrode layer, and the ionic conductivity is present between the electrolyte layer and the positive electrode layer and / or the negative electrode layer. It means that another layer having s may be present. “Solid unit cell” means a unit cell in which all layers constituting the unit cell are solid. That is, the electrolyte layer included in the solid unit cell is a solid electrolyte layer. The “assembled battery” means a battery that acts as one battery by connecting a plurality of unit cells in series and / or in parallel. The “hydrostatic pressure” means a pressure applied from any direction to an arbitrary point present in the gas by the gas. The “abnormality” in the assembled battery case is a concept including at least a situation in which the pressure inside the assembled battery case is out of a predetermined range.

  In the present invention, the detection means may include a contact-actuated sensor, and the sensor may be provided in a portion that generates contact when a part of the assembled battery case is deformed by the deformation means. preferable.

  Here, in the present invention, the sensor is of “contact operation type” means that the sensor includes a portion (contact) for contacting the detection target, and the contact of the contact with the detection target, or the contact Means that the sensor outputs a signal in response to the contact being displaced by an external force applied to the contact while being in contact with the detection target. In addition, the sensor is “provided in a part that comes into contact with the deformed part when a part of the assembled battery case is deformed by the deforming means” when the assembled battery case is deformed. Means that a sensor is provided at a site where the contact is activated upon detection of contact.

  Moreover, in this invention, it is preferable that a deformation | transformation means is a site | part which reduced rigidity from the other site | part in a part of assembled battery case.

  In the present invention, it is preferable that the abnormality that the deformation means reacts is a situation where the pressure inside the assembled battery case is out of a predetermined range.

  Further, the detection means has a sensor that is activated by contact, and the sensor is provided at a portion that comes into contact with a place where the deformation has occurred when a part of the assembled battery case is deformed by the deformation means. In the aspect of the present invention, the sensor may be disposed inside the assembled battery case.

  According to the present invention, since the deformation of the assembled battery case is detected, it is possible to provide a battery system that can easily detect an abnormality occurring in the assembled battery case.

It is sectional drawing which illustrates typically the battery system 100 concerning one Embodiment of this invention. 1 is a cross-sectional view schematically illustrating a solid state cell 10. It is sectional drawing which illustrates typically the battery system 200 concerning other embodiment of this invention. It is sectional drawing which illustrates typically the battery system 300 concerning other embodiment of this invention.

  Hereinafter, the present invention will be described mainly with reference to an example of a configuration having a lithium ion secondary battery and having one assembled battery case in one housing. In addition, the form shown below is an illustration of this invention and this invention is not limited to the form shown below. In the drawings, some reference numerals may be omitted. In the following, “A to B” means A or more and B or less unless otherwise specified.

<First Embodiment>
FIG. 1 is a cross-sectional view schematically illustrating the battery system 100 according to the first embodiment of the present invention. As shown in FIG. 1, the battery system 100 is provided in an assembled battery 20, an assembled battery case 30 that houses the assembled battery 20, a gas 40 filled in the assembled battery case 30, and the assembled battery case 30. The deforming means 50, the housing 60 that houses the assembled battery case 30, the contact operation type sensor 70 (detection means) disposed in the housing 60, and the control means 80 connected to the contact operation type sensor 70 And notification means 90 connected to the control means 80. The contact actuation type sensor 70 is disposed on the inner surface of the housing 60 so as to be close to the deformation means 50. The assembled battery 20 includes N (N ≧ 2) solid unit cells 10 ₁ ,..., 10 _N , and is connected to the positive electrode terminal 25 and the negative electrode terminal 26. The positive electrode terminal 25 and the negative electrode terminal 26 are fixed to the assembled battery case 30, and at least a part thereof is exposed to the outside of the assembled battery case 30.

The assembled battery 20 is a stacked assembled battery in which N solid unit cells 10 ₁ ,..., 10 _N are connected by stacking. FIG. 2 is a cross-sectional view schematically illustrating one solid state cell 10 _k (k = 1,..., N). As shown in FIG. 2, the solid unit cell 10 _k includes a solid electrolyte layer 1 _k , a positive electrode layer 2 _k and a negative electrode layer 3 _k disposed so as to sandwich the solid electrolyte layer 1 _k , and a positive electrode layer 2. It has a positive electrode current collector 4 _k disposed on the surface of the _k, and the anode current collector 5 _k disposed on the surface of the negative electrode layer 3 _k, the. In the assembled battery 20, N solid unit cells 10 ₁ ,..., 10 _N are arranged in the order of 10 ₁ ,..., 10 _{N in the} vertical direction of FIG. By being laminated, they are connected in series. In cell system 100, the outermost solid type positive electrode current collector 4 ₁ of the cell 10 ₁ of the battery pack 20 is connected to the positive terminal 25, the outermost solid-state battery cells 10 _N of the assembled battery 20 A negative electrode current collector 5 _N is connected to the negative electrode terminal 26.
In the following, the subscript k (k = 1,..., N) may be omitted.

As the solid electrolyte layer 1, for example, a solid electrolyte layer produced by press molding a solid electrolyte can be used. In addition to this, a solid electrolyte mixed with a solvent to form a slurry and then applied and dried can be used. As the solid electrolyte layer 1, one produced independently can be used, and one formed on the surface of the positive electrode layer 2 or the negative electrode layer 3 described later can also be used. As the solid electrolyte contained in the solid electrolyte layer 1, a known solid electrolyte having lithium ion conductivity can be used without particular limitation. For example, a sulfide solid electrolyte such as Li ₂ S—P ₂ S ₅ or an oxide solid electrolyte such as Li ₃ PO ₄ can be used.

The positive electrode layer 2 only needs to contain a positive electrode active material, and may contain a solid electrolyte in addition to the positive electrode active material. As the positive electrode active material contained in the positive electrode layer 2, for example, lithium cobaltate can be used. As the solid electrolyte, a known solid electrolyte having lithium ion conductivity (for example, Li ₂ S—P ₂ S ₅ or the like). Or an oxide solid electrolyte such as Li ₃ PO ₄ ). In addition to this, the positive electrode layer 2 includes a known conductive auxiliary agent (for example, acetylene black) that facilitates the formation of an electron conduction path, and a known binder (for example, polyvinylidene fluoride) that binds these substances. It may be contained. The positive electrode layer 2 can be produced by a known method. The form of the positive electrode layer 2 is not particularly limited as long as it is appropriately formed on the surface of the positive electrode current collector 4 described later. The thickness of the positive electrode layer 2 can be, for example, about 5 μm to 500 μm.

The negative electrode layer 3 only needs to contain a negative electrode active material, and may contain a solid electrolyte in addition to the negative electrode active material. As the negative electrode active material contained in the negative electrode layer 3, for example, graphite carbon can be used, and as the solid electrolyte, a known solid electrolyte having lithium ion conductivity (for example, Li ₂ S—P ₂ S ₅ or the like) can be used. A sulfide solid electrolyte or an oxide solid electrolyte such as Li ₃ PO ₄ can be used. In addition to this, the negative electrode layer 3 includes a known conductive auxiliary agent (for example, acetylene black) that facilitates formation of an electron conduction path, a known binder (for example, polyvinylidene fluoride) that binds these substances, and the like. It may be contained. The negative electrode layer 3 can be produced by a known method. The form of the negative electrode layer 3 is not particularly limited as long as it is appropriately formed on the surface of the negative electrode current collector 5 described later. The thickness of the negative electrode layer 3 can be, for example, about 5 μm to 500 μm.

  The material of the positive electrode current collector 4 and the negative electrode current collector 5 is not particularly limited as long as the current collector can be applied as a positive electrode current collector or a negative electrode current collector of a battery having a solid electrolyte layer. Instead, metal foil, a metal mesh, a metal vapor deposition film, etc. can be used. For example, a metal foil or mesh made of a metal material containing one or more elements selected from the group consisting of Cu, Ni, Al, V, Au, Pt, Mg, Fe, Ti, Co, Cr, Zn, Ge, and In Alternatively, a film such as polyamide, polyimide, polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polypropylene, or the like obtained by vapor-depositing the above metal material on glass, a silicon plate, or the like can be used. The form of the positive electrode current collector 4 and the negative electrode current collector 5 is not particularly limited, and the thickness can be, for example, about 5 μm to 500 μm.

  The form of the positive electrode terminal 25 and the negative electrode terminal 26 is not particularly limited as long as it is a terminal applicable as a terminal of a lithium ion secondary battery, and a metal plate, a metal rod, or the like can be used. For example, a known material having good conductivity such as Cu or Au can be used.

  The assembled battery case 30 is a member that houses the assembled battery 20 and holds a gas 40 described later so as not to leak out. From the standpoint of facilitating weight reduction of the entire battery system 100 while withstanding the pressure of the gas 40, for example, a metal material such as aluminum can be preferably used as the material constituting the assembled battery case 30. The assembled battery case 30 is provided with deformation means 50 described later.

The gas 40 is a gas filled in the assembled battery case 30 in order to pressurize the assembled battery 20 by hydrostatic pressure. The gas 40 is preferably a gas inert to the constituent material of the assembled battery 20. Examples of such a gas 40 include argon. The gas 40 may be a mixture of a plurality of gas components. The pressure of the gas 40 is preferably 0.1 kgf / cm ² to 40 kgf / cm ^{2 at} 20 ° C. By setting the pressure of the gas 40 at 20 ° C. to 0.1 kgf / cm ² or more, the adhesion between the layers constituting the assembled battery 20 can be increased, so that the internal resistance of the assembled battery 20 can be easily reduced. become. In addition, by setting the pressure of the gas 40 at 20 ° C. to 40 kgf / cm ² or less, the assembled battery case 30 is crushed from the inside and the gas 40 leaks, resulting in a decrease in the hydrostatic pressure applied to the assembled battery 20. It becomes easy to suppress the situation where the internal resistance of the assembled battery 20 increases.

  The deforming means 50 is a portion provided on the outer plate of the assembled battery case 30 and having a partially reduced rigidity. That is, the deformation means 50 is a part of the assembled battery case 30 and has a lower rigidity than other parts of the assembled battery case 30. In the battery system 100, for example, before assembling the assembled battery case 30, the deforming means 50 can be formed by pushing up a part of the outer plate that constitutes the assembled battery case 30 with a press to form a convex portion. . The plate thickness of the convex portion is stretched during pressing and becomes thinner than the surrounding plate thickness. Therefore, the deformation means 50 has a lower rigidity than the surroundings.

  As described above, the deformation means 50 has lower rigidity than the surroundings in the outer plate of the assembled battery case 30. Therefore, for example, the pressure inside the assembled battery case 30 (hereinafter sometimes referred to as “internal pressure”) increases abnormally, and the pressure outside the assembled battery case 30 (hereinafter referred to as “external pressure”). .)) Exceeds a predetermined threshold value, the deforming means 50 is deformed so as to swell toward the outside of the assembled battery case 30 in preference to the other parts of the assembled battery case 30. Here, the difference between the internal pressure and the external pressure of the battery pack case 30 (internal pressure-external pressure; hereinafter referred to as “internal / external pressure difference”), which is a threshold when the deforming means 50 starts to deform, is the external pressure. It is preferable to make it a value of 10% or more. That is, it is preferable that the deforming means 50 operates when the internal pressure becomes 10% or more higher than the external pressure. By operating the deformation means 50 when the internal pressure exceeds the external pressure by 10% or more, it becomes possible to reduce malfunctions when fluctuations in the internal / external pressure difference occur due to external factors such as temperature.

  The housing 60 is a member that accommodates the assembled battery case 30 and holds it in an appropriate position, and holds a contact actuation type sensor 70 described later in an appropriate position. Although the material which comprises the housing | casing 60 is not restrict | limited in particular, From a viewpoint of releasing efficiently the heat which generate | occur | produces with charging / discharging of the assembled battery 20, it is necessary to use the material which has favorable thermal conductivity. preferable. Examples of such a material include aluminum.

  The contact operation type sensor 70 is a detection unit that is disposed inside the housing 60 and detects the deformation of the deformation unit 50. As described above, by arranging the contact operation type sensor 70 (detection means) at a place other than the surface of the assembled battery case 30, it is easy to detect even a minute deformation of the deformation means 50. The contact operation type sensor 70 is connected to the control means 80 described later, and the output of the contact operation type sensor 70 is transmitted to the control means 80. When the contact operation type sensor 70 requires a power source for operation, power is supplied to the contact operation type sensor 70 from the positive electrode terminal 25 and the negative electrode terminal 26 to which the assembled battery 20 is connected via a power line (not shown). Supplied. The contact operation type sensor 70 is disposed in the vicinity of the deformation means 50. That is, the contact operation type sensor 70 is disposed at a position where it comes into contact with a portion related to the deformation means 50 when the deformation means 50 provided in the assembled battery case 30 is deformed. In normal times, a predetermined gap is preferably provided between the contact actuated sensor 70 and the deformation means 50, and the gap is preferably set to 1 mm to 10 mm, for example. By setting the gap to 1 mm or more, it is easy to suppress a situation in which the natural expansion of the assembled battery case 30 due to a temperature change that does not depend on an abnormality is erroneously detected as an abnormality. Further, by setting the gap to 10 mm or less, it becomes easy to quickly detect the deformation of the deformation means 50, so it becomes easy to quickly detect that the internal pressure of the assembled battery case 30 has risen abnormally. .

  The control means 80 controls the contact operation type sensor 70 and a notification means 90 described later. For this purpose, the control means 80 is connected to both the contact actuated sensor 70 and the notification means 90. Specifically, the control means 80 receives and processes the output signal from the contact actuation type sensor 70, and when the output signal detects the deformation of the deformation means 50, the notification means 90 described later. To that effect. When the control means 80 requires a power source for its operation, power is supplied to the control means 80 from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected via a power line (not shown). . As the control means 80, known control means such as a microcontroller (microcomputer) can be used without particular limitation.

  The notification means 90 is connected to the control means 80 and notifies the user that an abnormality has been detected in the assembled battery case 30 according to the output of the control means 80. When the notification means 90 requires a power source for operation, power is supplied from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected to the notification means 90 via a power line (not shown). As the notification means 90: a light emitting element such as a light bulb, a light emitting diode (LED), an organic electroluminescence (organic EL); a character display element such as a liquid crystal module or a liquid crystal panel; an acoustic element such as a piezoelectric buzzer; a vibration element; Or in combination.

  In the battery system 100, an abnormal increase in pressure inside the assembled battery case 30 is detected by detecting the deformation of the deformation means 50 by the contact operation type sensor 70, and notified to the user by the notification means 90. Here, the cause of the abnormal increase in pressure inside the assembled battery case 30 is that the gas 40 is generated due to overheating due to use in a severe high temperature environment or abnormal heat generation due to excessive current flowing due to a failure such as a short circuit. In addition to the situation in which the pressure itself increases, there may be a situation in which gas is generated due to an abnormal reaction in the assembled battery 20 and the internal pressure of the airtight assembled battery case 30 is increased. Hereinafter, an operation of the battery system 100 when the pressure abnormally increases in the assembled battery case 30 will be described.

  When the pressure inside the assembled battery case 30 rises abnormally for some reason and the internal / external pressure difference exceeds the predetermined threshold, the deformation means 50 provided in the assembled battery case 30 is moved to other parts of the assembled battery case 30. Preferentially, it deforms to bulge outward. When the deforming means 50 is deformed, the contact actuating type sensor 70 disposed in the housing 60 in the vicinity of the deforming means 50 before the deformation and the deforming means 50 are brought into contact with each other. When the contact operation type sensor 70 detects contact, a change occurs in the output signal of the contact operation type sensor 70, and the change is detected by the control means 80 connected to the contact operation type sensor 70. When the control unit 80 detects a change in the signal input from the contact operation type sensor 70, the control unit 80 outputs a signal to the notification unit 90 connected to the control unit 80. The notification means 90 notifies the user that the pressure inside the assembled battery case 30 has abnormally increased according to the output from the control means 80. In the battery system 100, instead of directly monitoring the pressure inside the assembled battery case 30, the deformation of the deforming means 50 provided in the assembled battery case 30 is detected, so that an abnormal pressure inside the assembled battery case 30 is easily detected. It becomes possible to do.

In the above description of the present invention, the battery system 100 having the assembled battery 20 including the solid unit cells 10 ₁ ,..., 10 _N , which are lithium ion secondary batteries, has been illustrated, but the present invention is not limited to the embodiment. . Each unit cell constituting the assembled battery may be a unit cell other than the solid state unit cell which is a lithium ion secondary battery. For example, it is possible to provide a battery system having an assembled battery including a plurality of unit cells which are so-called gel electrolyte type lithium secondary batteries in which not only an electrolyte but also a solvent is held in a polymer.

Further, in the above description of the present invention, solid-state battery cells 10 _1, ..., 10 _N but is exemplified cell system 100 of the form with the battery pack 20 connected in series, the present invention is not limited to this embodiment. It is also possible to adopt a form in which the assembled battery includes an assembled battery configured by parallel connection of solid-state cells. In addition, it is also possible to have an assembled battery configured by combining series connection and parallel connection.

  In the above description regarding the present invention, the battery having the deformation means 50 constituted by forming a part of the outer plate constituting the assembled battery case 30 into a convex shape by pressing and partially reducing the rigidity. Although the system 100 is illustrated, the present invention is not limited to this form. The deforming means in the battery system of the present invention can be configured by lowering the rigidity from the surroundings by a method such as welding by welding of different materials in addition to the above press work. Moreover, it is also possible to constitute by reducing the rigidity of one surface of the assembled battery case by making the plate thickness thinner than the other surface. In that case, the said one surface becomes a deformation | transformation means. That is, due to the abnormal rise in the assembled battery case internal pressure, the entire one surface is deformed so as to bulge toward the outside of the assembled battery case. In addition, it is also possible to configure all surfaces constituting the assembled battery case with the same plate thickness without partially reducing the rigidity of the assembled battery case. In this case, the entire assembled battery case It becomes a deformation means. That is, the entire assembled battery case is deformed so as to bulge outward due to an abnormal increase in the internal pressure of the assembled battery case.

  Moreover, in the said description regarding this invention, although the battery system 100 of the form which has the contact actuation type sensor 70 as a detection means was illustrated, this invention is not limited to the said form. In the battery system of the present invention, the detection means may have a sensor other than the contact operation type sensor. Examples of the sensor that can constitute the detection means other than the contact operation type sensor include a non-contact type sensor such as a beam sensor.

  Further, in the above description regarding the present invention, the battery system 100 in which the contact operation type sensor 70 (detecting means) is disposed on the inner surface of the housing 60 is illustrated, but the present invention is not limited to this form. In the electronic system of the present invention, the detection means may be arranged so as to be able to detect the deformation of the deformation means. Therefore, it is possible to adopt a configuration in which the sensor is held via positioning means such as a spacer disposed on the inner surface of the housing in accordance with a desired positional relationship between the sensor and the deformation means.

  In the above description regarding the present invention, the battery system 100 in which a signal is output from the contact operation type sensor 70 (detection unit) to the notification unit 90 via the control unit 80 has been exemplified. It is not limited. Depending on the form of the sensor constituting the detection means and the notification means, it is also possible to adopt a form in which the notification means operates by transmitting a signal directly from the detection means to the notification means without going through the control means. For example, when the detection means is constituted by a switch-type sensor that is brought into a conductive state upon contact, and the notification means is constituted by an LED that emits light when energized, the sensor (detection means) and the LED (notification means) are controlled by the control means. Even if the connection is made directly without going through, the LED (notification means) can emit light when the sensor (detection means) detects contact.

  Further, in the above description regarding the present invention, the battery system 100 in a form in which the power required by the contact operation type sensor 70 (detection unit), the control unit 80, and the notification unit 90 is supplied from the assembled battery 20 is exemplified. According to the said form, it becomes easy to reduce a number of parts, and it is preferable. However, the present invention is not limited to the embodiment. The power required by the detection means, the control means, and the notification means may be supplied from a power supply means other than the assembled battery included in the battery system of the present invention. Examples of such power supply means include an air battery, a liquid battery, a solar battery, and the like. According to such a form, it becomes possible to detect abnormalities in the internal pressure of the assembled battery case without being affected by the state of charge of the assembled battery included in the battery system.

  Moreover, in the said description regarding this invention, although the battery system 100 of the form with which the one assembled battery case 30 is provided in the inside of the one housing | casing 60 was illustrated, this invention is not limited to the said form. It is also possible to adopt a form in which a plurality of assembled battery cases are provided in one housing. When a plurality of assembled battery cases are provided in one casing, it is preferable that each assembled battery case includes a deforming means, and a plurality of detecting means are provided in one casing corresponding to each deforming means. .

Second Embodiment
FIG. 3 is a cross-sectional view schematically illustrating the battery system 200 according to the second embodiment of the present invention. As shown in FIG. 3, the battery system 200 is provided in the assembled battery 20, the assembled battery case 30 that houses the assembled battery 20, the gas 40 filled in the assembled battery case 30, and the assembled battery case 30. The deforming means 50, the contact actuating sensor 71 disposed in the deforming means 50, the housing 60 that houses the assembled battery case 30, the contact actuating sensor actuating means 72 provided in the housing 60, and the contact The control unit 80 connected to the operation type sensor 71 and the notification unit 90 connected to the control unit 80 are included. The contact actuation type sensor actuation means 72 is disposed on the inner surface of the housing 60 so as to be close to the contact actuation type sensor 71. The assembled battery 20 is connected to the positive terminal 25 and the negative terminal 26. The positive electrode terminal 25 and the negative electrode terminal 26 are fixed to the assembled battery case 30, and at least a part thereof is exposed to the outside of the assembled battery case 30.

  In the battery system 200, the position where the contact operation type sensor 71 is disposed is not the housing 60 side but the deformation means 50 side (the assembled battery case 30 side), and the contact operation type sensor 71 is operated on the housing 60 side. The battery system 100 has the same configuration as that of the battery system 100 according to the first embodiment except that the contact actuation type sensor actuation means 72 that is a member of the first embodiment is disposed. In the battery system 200, the contact actuating type sensor 71 and the contact actuating type sensor actuating means 72 constitute a detecting means. Hereinafter, differences of the battery system 200 from the battery system 100 described above will be described with reference to FIG.

  The contact actuation type sensor 71 is a contact actuation type sensor having the same configuration as the contact actuation type sensor 70 described above. As shown in FIG. 3, the contact operation type sensor 71 is disposed on the outer surface of the battery pack case 30 of the deformation means 50 provided in the battery pack case 30 so that the contacts are directed outward. The contact operation type sensor 71 is connected to the control device 80 so that the output signal can be transmitted to the control device 80. When the contact operation type sensor 71 requires a power source for its operation, electric power is supplied from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected to the contact operation type sensor 71 via a power line (not shown). Is supplied.

  The contact actuation type sensor actuation means 72 is a member for causing the contact actuation type sensor 71 to be brought into contact with the contact actuation type sensor 71 when the deformation means 50 is deformed. The contact actuating sensor 72 only needs to be able to reliably actuate the contact actuating sensor 71 when contact is made with the contact of the contact actuating sensor 71. For example, a metal or resin rod-shaped member or the like is used. Can do. The contact operation type sensor operation means 72 is disposed on the inner surface of the housing 60 at a position close to the contact operation type sensor 71. That is, the contact actuating sensor actuating means 72 is located on the inner surface of the housing 60 at a position where contact occurs with the contact actuating sensor 71 that causes displacement when the deforming means 50 deforms when the deforming means 50 deforms. It is arranged. It is preferable that a predetermined gap is provided between the contact operation type sensor 71 and the contact operation type sensor operation means 72 in normal times. The preferable range of the gap is the same as the preferable range of the gap provided between the contact operation type sensor 70 and the deformation means 50 in the battery system 100 described above.

  Hereinafter, an operation of the battery system 200 when the pressure abnormally increases in the assembled battery case 30 will be described.

  When the pressure inside the assembled battery case 30 rises abnormally for some reason and the internal / external pressure difference exceeds the predetermined threshold, the deformation means 50 provided in the assembled battery case 30 is moved to other parts of the assembled battery case 30. Preferentially, it deforms to bulge outward. When the deformation means 50 is deformed, the contact actuated sensor 71 disposed on the deformation means 50 is displaced in accordance with the deformation. When the contact operation type sensor 71 is displaced, the contact operation type sensor 71 and the contact operation type sensor operation means 72 arranged in the vicinity of the contact operation type sensor 71 are brought into contact with each other. When the contact operation type sensor 71 detects contact, a change occurs in the output signal of the contact operation type sensor 71, and the change is detected by the control means 80 connected to the contact operation type sensor 71. When the control unit 80 detects a change in the signal input from the contact operation type sensor 71, the control unit 80 outputs a signal to the notification unit 90 connected to the control unit 80. The notification means 90 notifies the user that the pressure inside the assembled battery case 30 has abnormally increased according to the output from the control means 80. In the battery system 200, instead of directly monitoring the pressure inside the assembled battery case 30, the deformation of the deforming means 50 provided in the assembled battery case 30 is detected, so that an abnormal pressure inside the assembled battery case 30 is easily detected. It becomes possible to do.

In the above description of the present invention, the battery system 200 having the assembled battery 20 including the solid unit cells 10 ₁ ,..., 10 _N which is a lithium ion secondary battery has been exemplified, but the present invention is not limited to the embodiment. . Each unit cell constituting the assembled battery may be a unit cell other than the solid state unit cell which is a lithium ion secondary battery. For example, it is possible to provide a battery system having an assembled battery including a plurality of unit cells which are so-called gel electrolyte type lithium secondary batteries in which not only an electrolyte but also a solvent is held in a polymer.

Further, in the above description of the present invention, solid-state battery cells 10 _1, ..., 10 _N but is exemplified cell system 200 of the embodiment having the battery pack 20 connected in series, the present invention is not limited to this embodiment. It is also possible to adopt a form in which the assembled battery includes an assembled battery configured by parallel connection of solid-state cells. In addition, it is also possible to have an assembled battery configured by combining series connection and parallel connection.

  In the above description regarding the present invention, the battery having the deformation means 50 constituted by forming a part of the outer plate constituting the assembled battery case 30 into a convex shape by pressing and partially reducing the rigidity. Although the system 200 is illustrated, the present invention is not limited to this form. The deforming means in the battery system of the present invention can be configured by lowering the rigidity from the surroundings by a method such as welding by welding of different materials in addition to the above press work. Moreover, it is also possible to constitute by reducing the rigidity of one surface of the assembled battery case by making the plate thickness thinner than the other surface. In that case, the said one surface becomes a deformation | transformation means. That is, due to the abnormal rise in the assembled battery case internal pressure, the entire one surface is deformed so as to bulge toward the outside of the assembled battery case. In addition, it is also possible to configure all surfaces constituting the assembled battery case with the same plate thickness without partially reducing the rigidity of the assembled battery case. In this case, the entire assembled battery case It becomes a deformation means. That is, the entire assembled battery case is deformed so as to bulge outward due to an abnormal increase in the internal pressure of the assembled battery case.

  Moreover, in the said description regarding this invention, although the battery system 200 of the form which has the contact actuation type sensor 71 as a detection means was illustrated, this invention is not limited to the said form. In the battery system of the present invention, the detection means may have a sensor other than the contact operation type sensor. Examples of the sensor that can constitute the detection means other than the contact operation type sensor include a non-contact type sensor such as a beam sensor.

  In the above description of the present invention, the battery system 200 in which a signal is output from the contact operation type sensor 71 (detection unit) to the notification unit 90 via the control unit 80 is illustrated. It is not limited. Depending on the form of the sensor constituting the detection means and the notification means, it is also possible to adopt a form in which the notification means operates by transmitting a signal directly from the detection means to the notification means without going through the control means. For example, when the detection means is constituted by a switch-type sensor that is brought into a conductive state upon contact, and the notification means is constituted by an LED that emits light when energized, the sensor (detection means) and the LED (notification means) are controlled by the control means. Even if the connection is made directly without going through, the LED (notification means) can emit light when the sensor (detection means) detects contact.

  Further, in the above description regarding the present invention, the battery system 200 in the form in which the power required by the contact operation type sensor 71 (detection unit), the control unit 80, and the notification unit 90 is supplied from the assembled battery 20 is illustrated. According to the said form, it becomes easy to reduce a number of parts, and it is preferable. However, the present invention is not limited to the embodiment. The power required by the detection means, the control means, and the notification means may be supplied from a power supply means other than the assembled battery included in the battery system of the present invention. Examples of such power supply means include an air battery, a liquid battery, a solar battery, and the like. According to such a form, it becomes possible to detect abnormalities in the internal pressure of the assembled battery case without being affected by the state of charge of the assembled battery included in the battery system.

  Moreover, in the said description regarding this invention, although the battery system 200 of the form with which the one assembled battery case 30 is provided in the inside of the one housing | casing 60 was illustrated, this invention is not limited to the said form. It is also possible to adopt a form in which a plurality of assembled battery cases are provided in one housing. When a plurality of assembled battery cases are provided in one casing, it is preferable that each assembled battery case includes a deforming means, and a plurality of detecting means are provided in one casing corresponding to each deforming means. .

<Third Embodiment>
FIG. 4 is a cross-sectional view schematically illustrating a battery system 300 according to the third embodiment of the present invention. As shown in FIG. 4, the battery system 300 is provided in the assembled battery 20, the assembled battery case 31 that houses the assembled battery 20, the gas 40 filled in the assembled battery case 31, and the assembled battery case 31. The deforming means 51, the casing 61 that houses the assembled battery case 31, the first contact operation type sensor 73 disposed in the casing 61, and the second contact operation type disposed on the inner surface of the assembled battery case 31. Connected to the sensor holding means 75, the second contact action type sensor 74 held by the second contact action type sensor holding means 75, the first contact action type sensor 73 and the second contact action type sensor 74. Control means 81, and notification means 91 connected to the control means 81. The first contact actuation sensor 73 is disposed on the inner surface of the housing 61 so as to be close to the deformation means 51. Further, the second contact actuation type sensor 74 is held inside the assembled battery case 31 by the second contact actuation type sensor holding means 75 so as to be close to the deformation means 51. The assembled battery 20 is connected to the positive terminal 25 and the negative terminal 26. The positive electrode terminal 25 and the negative electrode terminal 26 are fixed to the assembled battery case 31, and at least a part thereof is exposed to the outside of the assembled battery case 30.

  The assembled battery 20 is an assembled battery having the above-described configuration, and is connected to the positive terminal 25 and the negative terminal 26.

  The assembled battery case 31 is a member that houses the assembled battery 20 and holds the gas 40 so as not to leak out. Unlike the above-described assembled battery case 30, the assembled battery case 31 is an assembled battery case that swells into a predetermined shape by pressurizing and filling the gas 40 therein. Such an assembled battery case 31 can be comprised by the assembly-type aluminum case etc. which provided the folding location, for example. The assembled battery case 31 is provided with a deformation means 51 and a second contact operation type sensor holding means 75 described later.

  The gas 40 is a gas having the above-described configuration. The gas 40 is pressurized and filled in the assembled battery case 31 and has a role of keeping the assembled battery case 31 in a predetermined shape while pressurizing the assembled battery 20 with hydrostatic pressure.

  The deforming means 51 is a portion provided in the assembled battery case 31 and having a partially reduced rigidity. That is, the deforming means 51 is a part of the assembled battery case 31 and has a lower rigidity than other parts of the assembled battery case 31. In the battery system 300, for example, before the assembled battery case 31 is assembled, the deforming means 51 can be formed by pushing up a part of the outer plate that constitutes the assembled battery case 31 with a press to form a convex portion. . The plate thickness of the convex portion is stretched during pressing and becomes thinner than the surrounding plate thickness. Therefore, the deformation means 51 has lower rigidity than the surroundings.

  As described above, the deformation means 51 has lower rigidity than the surroundings in the outer plate of the assembled battery case 31. Therefore, when the internal pressure of the assembled battery case 31 rises abnormally and the difference from the external pressure of the assembled battery case 31 exceeds a predetermined threshold, the deforming means 51 takes precedence over the other parts of the assembled battery case 31 and It is deformed so as to swell toward the outside of the battery case 31 (hereinafter sometimes referred to as “expanded deformation”). Here, it is preferable that the difference between the internal pressure and the external pressure (internal / external pressure difference) of the assembled battery case 31 that is a threshold when the deforming means 51 starts expansion and deformation is a value of 10% or more of the external pressure. That is, it is preferable that the deformation means 51 expands and deforms when the internal pressure becomes 10% or more higher than the external pressure. By causing the deformation means 51 to expand and deform when the internal pressure exceeds the external pressure by 10% or more, it is possible to reduce malfunctions when fluctuations occur in the internal and external pressure differences due to external factors such as temperature.

  Further, when the internal pressure of the assembled battery case 31 is abnormally decreased and the difference between the internal pressure and the external pressure (internal pressure−external pressure) of the assembled battery case 31 is below a predetermined threshold, the deforming means 51 Prior to the portion, it is deformed so as to be recessed toward the inside of the assembled battery case 31 (hereinafter, sometimes referred to as “shrinkage deformation”). Here, it is preferable that the difference between the internal pressure and the external pressure (internal / external pressure difference) of the assembled battery case 31 that is a threshold when the deforming means 51 starts contraction deformation is a value of 10% or more of the external pressure. That is, it is preferable that the deformation means 51 is contracted and deformed when the internal pressure becomes 10% or more lower than the external pressure. By deforming and deforming the deforming means 51 when the internal pressure falls below the external pressure by 10% or more, it becomes possible to reduce malfunctions when fluctuations in the internal and external pressure differences occur due to external factors such as temperature.

  The housing 61 is a member that accommodates the assembled battery case 31 and holds it in an appropriate position, and holds the first contact operation type sensor 73 in an appropriate position. As the casing 61, a casing having the same configuration as the casing 60 described above can be used.

  The first contact actuation sensor 73 is a sensor that is disposed inside the housing 61 and detects the expansion and deformation of the deformation means 51. The first contact actuation type sensor 73 is connected to the control means 81 described later, and the output of the first contact actuation type sensor 73 is transmitted to the control means 81. When the first contact operation type sensor 73 requires a power source for operation, power is supplied from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected via a power line (not shown). The first contact actuation type sensor 73 is disposed on the inner surface of the casing 61 in the vicinity of the deformation means 51. That is, the first contact operation type sensor 73 comes into contact with a portion related to the deformation means 51 when the deformation means 51 provided in the above-described assembled battery case 31 is deformed (expanded deformation) so as to expand outward. Arranged in position. As the first contact actuation sensor 73, a sensor having the same configuration as the contact actuation sensor 70 described above can be used. In normal times, it is preferable that a predetermined gap is provided between the first contact actuation sensor 73 and the deformation means 51, and the size of the gap is the contact actuation sensor in the battery system 100 described above. The size can be the same as the gap between 70 and the deformation means 50.

  The second contact operation type sensor 74 is a sensor that is disposed inside the assembled battery case 31 while being held by second contact operation type sensor holding means 75 described later, and detects contraction deformation of the deformation means 51. In the battery system 300, the first contact actuation sensor 73 and the second contact actuation sensor 74 constitute a detection means. The second contact operation type sensor 74 is connected to the control means 81 described later, and the output of the second contact operation type sensor 74 is transmitted to the control means 81. When the second contact operation type sensor 74 requires a power source for operation, power is supplied from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected via a power line (not shown). The second contact operation type sensor 74 is disposed in the vicinity of the deformation means 51 inside the assembled battery case 31. In other words, the second contact operation type sensor 74 is deformed when the deformation means 51 provided in the assembled battery case 31 is deformed so as to be dented inward (shrinkage deformation). It arrange | positions in the position which contacts the part which concerns on the means 51. FIG. As the second contact actuation sensor 74, a sensor having the same configuration as the contact actuation sensor 70 described above can be used. In normal times, a predetermined gap is preferably provided between the second contact actuation sensor 74 and the deformation means 51, and the size of the gap is the contact actuation sensor in the battery system 100 described above. The size can be the same as the gap between 70 and the deformation means 50.

  The second contact actuation type sensor holding means 75 is a member that is disposed on the inner surface of the assembled battery case 31 and holds the above-described second contact actuation type sensor 74 in a predetermined position. The second contact operation type sensor holding means 75 is configured to perform the second contact operation so that the second contact operation type sensor 74 operates reliably when the deformed deformation means 51 and the second contact operation type sensor 74 are brought into contact with each other. It is sufficient that the mold sensor 74 can be held. Such second contact actuation type sensor holding means 75 can be constituted by a metal plate, for example.

  The control unit 81 controls the first contact operation type sensor 73, the second contact operation type sensor 74, and a notification unit 91 described later. Therefore, the control unit 81 is connected to any of the first contact operation type sensor 73, the second contact operation type sensor 74, and the notification unit 90. Specifically, the control means 81 receives and processes output signals from the first contact actuation type sensor 73 and the second contact actuation type sensor 74, and the output signal detects the deformation of the deformation means 51. If this happens, a message to that effect is output to the notification means 91 described later. The content output by the control means 81 to the notification means 91 may be the same regardless of which of the first contact actuation sensor 73 and the second contact actuation sensor 74 is activated. The content may be different between when the sensor 73 detects contact and when the second contact actuation sensor 74 detects contact. When the control means 81 requires a power source for its operation, power is supplied from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected to the control means 81 via a power line (not shown). . As the control means 81, known control means such as a microcontroller (microcomputer) can be used without particular limitation.

  The notification unit 91 is connected to the control unit 81 and notifies the user that an abnormality has been detected in the assembled battery case 31 according to the output of the control unit 81. When the notification means 91 requires a power source for operation, power is supplied from the positive terminal 25 and the negative terminal 26 to which the assembled battery 20 is connected via a power line (not shown). As the notification means 91: a light emitting element such as a light bulb, light emitting diode (LED), organic electroluminescence (organic EL); a character display element such as a liquid crystal module or a liquid crystal panel; an acoustic element such as a piezoelectric buzzer; a vibration element; Or in combination. Further, an output signal from the control means 81 may be sent to an in-vehicle information system such as a car navigation system, and notification may be made there. In that case, the in-vehicle information system acts as the notification means 91. Note that when the above-described control unit 81 outputs different contents depending on whether the first contact operation type sensor 73 detects contact or the second contact operation type sensor 74 detects contact, the notification unit 91 It is preferable that two types of abnormalities can be notified together with the output of the different contents. As such a notification means 91, the display apparatus which combined several LED can be mentioned, for example.

  In the battery system 300, when the deformation means 51 is expanded and deformed, that is, the cause of the abnormal increase in pressure in the assembled battery case 31 is a failure such as overheating or short circuit due to use in a severe high temperature environment. In addition to the situation where the pressure itself indicated by the gas 40 increases due to abnormal heat generation due to an excessive current flowing through the gas, gas is generated due to an abnormal reaction inside the assembled battery 20 and the internal pressure of the airtight assembled battery case 31 is increased. The situation is considered. Hereinafter, the operation of the battery system 300 when the pressure abnormally increases in the assembled battery case 31 will be described.

  When the pressure inside the assembled battery case 31 abnormally increases for some reason and the internal / external pressure difference exceeds the predetermined expansion deformation threshold, the deformation means 51 provided in the assembled battery case 31 Prior to the part, deformation (expansion deformation) occurs so as to swell outward. When the deformation means 51 expands and deforms, the deformation means 51 comes into contact with the first contact actuating sensor 73 disposed in the casing 61 in the vicinity of the deformation means 51 before the deformation. When the first contact actuation type sensor 73 detects contact, a change occurs in the output signal of the first contact actuation type sensor 73, and the change is detected by the control means 81 connected to the first contact actuation type sensor 73. When the control unit 81 detects a change in the signal input from the first contact actuation sensor 73, the control unit 81 outputs a signal to the notification unit 91 connected to the control unit 81. The notification means 91 notifies the user that an abnormality has occurred in the pressure inside the assembled battery case 31 or that the pressure inside the assembled battery case 31 has risen abnormally in accordance with the output from the control means 81. In the battery system 300, instead of directly monitoring the pressure inside the assembled battery case 31, the expansion and deformation of the deformation means 51 is detected, so that an abnormal pressure inside the assembled battery case 31 or an abnormal increase in pressure is easily detected. It becomes possible.

  In the battery system 300, when the deformation means 51 is contracted and deformed, that is, the cause that the pressure can be abnormally reduced inside the assembled battery case 31 is that the gas 40 is heated due to supercooling accompanying use in a severe low temperature environment. In addition to the situation in which the pressure itself decreases, there may be a situation in which the internal pressure of the assembled battery case 31 decreases as a result of the airtightness of the assembled battery case 31 being destroyed for some reason and the gas 40 leaking out of the assembled battery case 31. . Hereinafter, an operation of the battery system 300 when the pressure is abnormally reduced in the assembled battery case 31 will be described.

  When the pressure inside the assembled battery case 31 is abnormally reduced for some reason and the internal / external pressure difference falls below the predetermined shrinkage deformation threshold, the deformation means 51 provided in the assembled battery case 31 Prior to the part, deformation (contraction deformation) occurs so as to dent inward. When the deformation means 51 contracts and deforms, the deformation means 51 comes into contact with the second contact actuating sensor 74 disposed in the assembled battery case 31 in the vicinity of the deformation means 51 before the deformation. When the second contact actuation sensor 74 detects contact, a change occurs in the output signal of the second contact actuation sensor 74, and the change is detected by the control means 81 connected to the second contact actuation sensor 74. When the control unit 81 detects a change in the signal input from the second contact actuation sensor 74, the control unit 81 outputs a signal to the notification unit 91 connected to the control unit 81. The notification means 91 notifies the user that an abnormality has occurred in the pressure inside the assembled battery case 31 or that the pressure inside the assembled battery case 31 has dropped abnormally according to the output from the control means 81. In the battery system 300, instead of directly monitoring the pressure inside the assembled battery case 31, the contraction deformation of the deformation means 51 is detected, so that an abnormal pressure inside the assembled battery case 31 or an abnormal drop in pressure is easily detected. It becomes possible.

  As described above, the battery system 300 includes the first contact actuation sensor 73 and the second contact actuation sensor 74 both outside and inside the assembled battery case 31. Therefore, according to the battery system 300, it is possible to easily detect both an abnormal increase and an abnormal decrease in the pressure inside the assembled battery case 31. Therefore, it becomes easy to easily detect a situation where the performance of the assembled battery 20 included in the battery system 300 may be deteriorated or a situation where the safety of the battery system 300 itself may be threatened.

In the above description regarding the present invention, the battery system 300 having the assembled battery 20 including the solid unit cells 10 ₁ ,..., 10 _N , which are lithium ion secondary batteries, has been illustrated, but the present invention is not limited to the embodiment. . Each unit cell constituting the assembled battery may be a unit cell other than the solid state unit cell which is a lithium ion secondary battery. For example, it is possible to provide a battery system having an assembled battery including a plurality of unit cells which are so-called gel electrolyte type lithium secondary batteries in which not only an electrolyte but also a solvent is held in a polymer.

Further, in the above description of the present invention, solid-state battery cells 10 _1, ..., 10 _N is has been illustrated cell system 300 of the form with the battery pack 20 connected in series, the present invention is not limited to this embodiment. It is also possible to adopt a form in which the assembled battery includes an assembled battery configured by parallel connection of solid-state cells. In addition, it is also possible to have an assembled battery configured by combining series connection and parallel connection.

  Further, in the above description regarding the present invention, a battery having a deforming means 51 formed by forming a part of the outer plate to constitute the assembled battery case 31 into a convex shape by pressing and partially reducing the rigidity. Although the system 300 is illustrated, the present invention is not limited to this form. The deforming means in the battery system of the present invention can be configured by lowering the rigidity from the surroundings by a method such as welding by welding of different materials in addition to the above press work. Moreover, it is also possible to constitute by reducing the rigidity of one surface of the assembled battery case by making the plate thickness thinner than the other surface. In that case, the said one surface becomes a deformation | transformation means. That is, when the assembled battery case internal pressure rises abnormally, the entire one surface is deformed (expanded) so as to expand toward the outside of the assembled battery case. Further, when the assembled battery case internal pressure is abnormally reduced, the entire surface is deformed (contracted) so as to be recessed toward the inside of the assembled battery case. In addition, it is also possible to configure all surfaces constituting the assembled battery case with the same plate thickness without partially reducing the rigidity of the assembled battery case. In this case, the entire assembled battery case It becomes a deformation means. That is, when the assembled battery case internal pressure rises abnormally, the entire assembled battery case deforms (expands and deforms) to expand outward, and when the assembled battery case internal pressure decreases abnormally, the entire assembled battery case moves inward. Deforms so that it dents (shrink deformation).

  Moreover, although the battery system 300 of the form which has the 1st contact operation type sensor 73 and the 2nd contact operation type sensor 74 as a detection means was illustrated in the said description regarding this invention, this invention is not limited to the said form. In the battery system of the present invention, the detection means may have a sensor other than the contact operation type sensor. Examples of the sensor that can constitute the detection means other than the contact operation type sensor include a non-contact type sensor such as a beam sensor.

  In the above description of the present invention, the battery system 300 in the form in which the first contact actuation type sensor 73 constituting the detection unit is disposed on the inner surface of the casing 61 is illustrated, but the present invention is not limited to this form. . In the electronic system of the present invention, the detection means may be arranged so as to be able to detect the deformation of the deformation means. Therefore, according to the desired positional relationship between the first contact actuation sensor and the deformation means, the first contact actuation sensor is held via positioning means such as a spacer disposed on the inner surface of the housing. It is also possible to do.

  In the above description regarding the present invention, the battery system 300 is configured such that a signal is output from the first contact operation type sensor 73 and the second contact operation type sensor 74 (detection unit) to the notification unit 91 via the control unit 81. Although illustrated, this invention is not limited to the said form. Depending on the form of the sensor constituting the detection means and the notification means, it is also possible to adopt a form in which the notification means operates by transmitting a signal directly from the detection means to the notification means without going through the control means. For example, both the first contact operation type sensor and the second contact operation type sensor that constitute the detection means are constituted by a switch type sensor that is in a conductive state by contact, and the notification means has two LEDs that emit light when energized. In the case of comprising, the first contact operation type sensor and one LED are directly connected without going through the control means, and the second contact action type sensor and the other LED are directly connected without going through the control means. By doing so, when each sensor (detection means) detects contact, any one of the LEDs (notification means) emits light and can notify the user.

  In the above description of the present invention, the battery pack 20 supplies power necessary for the first contact operation type sensor 73 and the second contact operation type sensor 74 (detection unit), the control unit 81, and the notification unit 91. The battery system 300 of the form was illustrated. According to the said form, it becomes easy to reduce a number of parts, and it is preferable. However, the present invention is not limited to the embodiment. The power required by the detection means, the control means, and the notification means may be supplied from a power supply means other than the assembled battery included in the battery system of the present invention. Examples of such power supply means include an air battery, a liquid battery, a solar battery, and the like. According to such a form, it becomes possible to detect abnormalities in the internal pressure of the assembled battery case without being affected by the state of charge of the assembled battery included in the battery system.

  Moreover, in the said description regarding this invention, although the battery system 300 of the form with which the one assembled battery case 31 is provided inside the one housing | casing 61 was illustrated, this invention is not limited to the said form. It is also possible to adopt a form in which a plurality of assembled battery cases are provided in one housing. When a plurality of assembled battery cases are provided in one casing, it is preferable that each assembled battery case includes a deforming means, and a plurality of detecting means are provided in one casing corresponding to each deforming means. .

  Moreover, in the said description regarding this invention, although the battery system 300 of the form which has the assembled battery case 31 of the form which becomes a predetermined shape by pressurizing and filling the gas 40 inside is illustrated, this invention is in the said form. It is not limited. For example, it is possible to provide a battery system in which gas is pressurized and filled not only in the assembled battery case but also in a space outside the assembled battery case and inside the housing. In the battery system, the deforming means may be contracted and deformed by a decrease in the internal pressure of the assembled battery case, even if the assembled battery case does not have a predetermined shape due to internal pressure. Therefore, even in such a battery system, it is possible to easily detect both abnormal rise and fall in the internal pressure of the battery pack case by having the detection means both inside and outside the battery pack case. It becomes.

  Further, in the above description regarding the present invention, the battery system 300 in a form provided with detection means (the first contact operation type sensor 73 and the second contact operation type sensor 74) both inside and outside the assembled battery case 31 is illustrated. The present invention is not limited to this form. For example, it is possible to provide a battery system having a detection means only inside the assembled battery case. According to such a form, it is possible to easily detect a decrease in the internal pressure of the assembled battery case, and at the same time, it is possible to reduce the number of parts and the cost.

  The battery system of the present invention can be suitably used for a battery system provided for an electric vehicle, a hybrid vehicle, or the like.

DESCRIPTION OF SYMBOLS 1 ... Solid electrolyte layer 2 ... Positive electrode layer 3 ... Negative electrode layer 4 ... Positive electrode collector 5 ... Negative electrode collector 10 ... Solid type battery 20 ... Assembly battery 25 ... Positive electrode terminal 26 ... Negative electrode terminal 30 ... Assembly battery case 31 ... Battery pack case 40 ... Gas 50 ... Deformation means 51 ... Deformation means 60 ... Housing 61 ... Housing 70 ... Contact actuated sensor (detection means)
71 ... Contact actuated sensor (detection means)
72 ... Contact actuating type sensor actuating means (detecting means)
73 ... 1st contact action type sensor (detection means)
74. Second contact operation type sensor (detection means)
75. Second contact operation type sensor holding means (detection means)
80 ... Control means 81 ... Control means 90 ... Notification means 91 ... Notification means 100 ... Battery system 200 ... Battery system 300 ... Battery system

Claims (5)

An assembled battery having a plurality of solid unit cells, an assembled battery case for housing the assembled battery, and a gas filled in the assembled battery case, and the hydrostatic pressure generated in the assembled battery case by the gas A battery system that pressurizes the unit cell using
Deformation means for producing a deformation in a part of the assembled battery case in response to the abnormality when an abnormality occurs in the assembled battery case;
A battery system comprising: detecting means for detecting the deformation. The detecting means has a contact-actuated sensor;
2. The battery system according to claim 1, wherein the sensor is provided in a portion that generates contact when a part of the assembled battery case is deformed by the deforming unit.   3. The battery system according to claim 1, wherein the deforming unit is a part in which rigidity is lowered in a part of the assembled battery case from other parts.   The battery system according to any one of claims 1 to 3, wherein the abnormality that the deformation means reacts is a situation in which the pressure inside the assembled battery case is out of a predetermined range.   The battery system according to any one of claims 2 to 4, wherein the sensor is disposed inside the assembled battery case.

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