JP2019110675A - Discharge control device, power storage system, and discharge control method for power storage elements - Google Patents

Abstract

To provide a discharge control device capable of safely stopping a moving body when the moving body has an abnormality.SOLUTION: A discharge control device according to one aspect of the present invention is installed as a drive energy source in a moving body, is connected to a power storage module having a plurality of power storage elements, and includes a first discharge control unit that forcibly discharges the power storage elements to a first power storage amount for enabling driving of the moving body, and a second discharge control unit that discharges the power storage elements to a second power storage amount lower than the first power storage amount when the moving body is stopped after the power storage elements are discharged to the first power storage amount.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a discharge control device, a storage system, and a discharge control method of a storage element.

  A chargeable / dischargeable storage element is used in various devices such as mobile phones and automobiles. Above all, mobile objects powered by electrical energy such as electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) require large amounts of energy, so a large-capacity storage module equipped with a plurality of storage elements is mounted. ing.

  In the mobile unit carrying the storage module, an abnormality may be detected in a unique situation other than the normally expected use form. For example, in a battery having a high energy density, abnormal heat generation may occur due to an internal short circuit or an external short circuit of the battery. In addition, when a moving object collides, another object abuts on the storage element, causing damage to the storage element and causing a short circuit, which may cause an obstacle to the rescue operation of the occupant due to the electric leakage.

  For this reason, it has been proposed to discharge the battery (storage element) rapidly to ensure safety in the event of a collision of a vehicle (moving body). According to International Publication WO 2014/057538 A1, when the battery is discharged by detecting a collision of the vehicle, the battery is damaged by stopping the discharge of the battery when the state of charge of the battery becomes equal to or less than a predetermined value which does not become an overdischarge. It has been disclosed that batteries without batteries can be reused. U.S. Patent Publication No. 2016 / 0377667A1 discloses a technique for detecting a short circuit quickly.

  As described above, when a collision of a vehicle or an abnormality of a battery is detected, although there is an attempt to make the battery safe by discharging the storage element immediately, the traveling function of the vehicle is It will be lost. For this reason, it becomes difficult to move the vehicle by itself and to move from the accident site, which may cause a secondary disaster such as a collision of another traveling vehicle.

International Publication WO2014 / 057538A1 US release 2016 / 0377667A1

  An object of the present invention is to provide a discharge control device, a storage system, and a discharge control method of storage devices capable of safely stopping the moving body in an emergency of the moving body.

  A discharge control device according to an aspect of the present invention is mounted on a moving body as a drive energy source, is connected to a storage module having a plurality of storage elements, and has a first storage capacity capable of driving the storage body as the moving body A first discharge control unit that forcibly discharges the battery until the charge storage device is discharged to the first storage amount, and when the mobile body stops after discharging the storage device to the first storage amount, And a second discharge control unit that discharges the battery to a storage amount.

  A discharge control method of a storage element according to another aspect of the present invention is a first storage capable of driving the storage element of a movable body mounted with a storage module having a plurality of storage elements as a drive energy source. When the moving body is stopped after discharging the storage element to the first storage amount by forcibly discharging the storage element to the amount, the second storage amount lower than the first storage amount And discharging until it becomes.

  According to the discharge control device and the discharge control method of the storage element, the moving body can be safely stopped when the moving body is in an emergency.

It is a schematic diagram which shows a mobile body provided with the electrical storage system of one Embodiment of this invention. It is a schematic perspective view which shows the structure of the electrical storage module of the electrical storage system of FIG. It is a schematic plan view of the electrical storage pack which has an electrical storage module of FIG. It is a block diagram which shows the structure of the discharge control apparatus of the electrical storage system of FIG. It is a flowchart which shows the procedure of the discharge method of the electrical storage element in the electrical storage system of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  One aspect of the discharge control device according to the present invention is mounted on a mobile body as a drive energy source, connected to a storage module having a plurality of storage elements, and the first storage amount capable of driving the storage body as the storage body A first discharge control unit that forcibly discharges the battery until the charge storage device is discharged to the first storage amount, and when the mobile body stops after discharging the storage device to the first storage amount, And a second discharge control unit that discharges the battery to a storage amount.

  The said discharge control apparatus makes the 1st discharge control part which carries out the forced discharge of the said electrical storage element until it becomes the 1st electrical storage amount which can drive the said mobile body, when the abnormality of the said mobile body or the said electrical storage element is detected. Prepare. Therefore, the mobile body can be moved to a safe position while the first discharge control unit discharges the storage element to the first storage amount to reduce the unsafe state when the mobile body or the storage element is abnormal. . The discharge control device discharges the storage element to a second storage amount lower than the first storage amount when the movable body stops after discharging the storage element to the first storage amount. And a second discharge control unit. Therefore, by stopping the storage element after moving the moving body to a safe position, the stopped moving body can be put in a safer state.

  In the discharge control device, the first storage amount is preferably 5% or more and 25% or less of the storage capacity of the storage element. According to this configuration, the unsafe state of the storage element can be reduced, and the short distance movement of the movable body can be enabled.

  The discharge control device may further include an abnormality detection unit that detects that the potential difference between the plurality of storage elements is equal to or more than a predetermined threshold. According to this configuration, since the voltage drop of a part of the storage elements is detected, which indicates the possibility of internal short circuit or leakage of the storage elements, the necessity of discharging the storage elements can be determined more accurately.

  In the discharge control device, the first discharge control unit or the second discharge control unit may be configured to operate at least one of the brake of the movable body and the drive motor in order to discharge the storage element. Good. According to this configuration, the configuration for discharging the storage element is relatively simple, and the storage element can be reused.

  In the discharge control device, the first discharge control unit or the second discharge control unit may be configured to short the storage element via a cooling member through which a cooling fluid passes. According to this configuration, since the heat energy released by the discharge can be taken away by the cooling fluid, more rapid discharge is possible.

  One aspect of the discharge control method of a storage element according to the present invention is a mobile object equipped with a storage module having a plurality of storage elements as a driving energy source, wherein the first storage amount capable of driving the storage element with the storage element When the moving body is stopped after discharging the storage element to the first storage amount, the storage element is set to a second storage amount lower than the first storage amount. And discharging until it becomes.

  The discharge control method of the storage element discharges the storage element by discharging the storage element to a first storage amount capable of driving the moving body when the moving body or the storage element is abnormal. The mobile can be moved to a safe position while reducing the condition. Further, in the method of controlling discharge of the storage element, the second storage of the storage element lower than the first storage amount is performed when the moving body is stopped after the storage element is discharged to the first storage amount. Since the discharge is performed until the amount is reached, the stopped mobile unit can be put in a safer state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings with reference to the drawings.

  FIG. 1 shows a mobile unit (car) V provided with a power storage system 1 according to an embodiment of the present invention. The mobile unit V can be, for example, an electric vehicle such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV). Also, the moving body V is not limited to a passenger car, and may be a freight car.

  The storage system 1 includes a storage module 2 mounted on a mobile body V as a drive energy source, and a discharge control device 3 connected to the storage module 2.

  Each storage module 2 has a plurality of storage elements 4 as shown in FIG. The storage system 1 of the mobile unit V may use a storage pack 5 having a plurality of storage modules 2 as shown in FIG. 3. The storage module 2 (storage pack 5) can be housed in a space typically provided under the seat of the mobile V.

  As shown in FIG. 4, the discharge control device 3 forcibly discharges the storage element 4 to the first storage amount capable of driving the moving body V when an abnormality of the moving body V or the storage element 4 is detected. When the mobile body V stops after discharging the first discharge control unit 6 to cause the storage element 4 to the first storage amount, until the storage element 4 becomes the second storage amount lower than the first storage amount A second discharge control unit 7 for discharging, an abnormality detection unit 8 for detecting an abnormality of the mobile unit V or the storage element 4, and a stop detection unit 9 for detecting a stop of the mobile unit V after the operation of the mobile unit V is provided.

  Discharge control device 3 forcibly discharges until the first discharge control unit 6 reaches the first storage amount at which storage element 4 can be driven by mobile unit V when abnormality of mobile unit V or storage unit 4 is detected. Let The storage element 4 is discharged to the first storage amount to reduce the unsafe state, and the movement of the mobile body V to the safe position is enabled. Thereby, for example, when the mobile V encounters a traffic accident on the road, abnormal heat generation of the storage element 4 can be prevented immediately, and the mobile V can be moved to a road shoulder or the like to further reduce the risk such as a rear collision. it can.

  Furthermore, in the discharge control device 3, when the mobile body V is stopped after discharging the storage element 4 to the first storage amount, the second discharge control unit 7 reduces the storage element 4 to the first storage amount. Since the secondary battery is discharged to the storage amount, an electric shock accident due to a short circuit of the storage element 4 can be prevented after the mobile body V is moved to a safe place.

  The first discharge control unit 6 has means for calculating the storage amount of the storage element 4. Specifically, it is preferable to have a mechanism that integrates the discharge current from storage element 4 (storage module 2) to calculate the remaining storage amount. That is, the first discharge control unit 6 grasps the remaining storage amount of the storage element 4 from the time of normal use of the moving body V, and further subtracts the discharge current when the abnormality of the moving body V or the storage element 4 is detected. When the storage amount of the storage element 4 reaches a predetermined first storage amount, the discharge (except for the power consumption by the normal function of the moving body V) is stopped.

  As the first storage amount, it is possible to move (self-travel) a small distance of the moving body V, and set the storage amount that does not generate abnormal heat even if the storage element 4 is shorted (slightly shorted or hard shorted) Be done.

  Specifically, the lower limit of the first storage amount is preferably 5% of the storage capacity of the storage element 4 and more preferably 10%. On the other hand, as the upper limit of the first storage amount, 25% of the storage capacity of the storage element 4 is preferable, and 20% is more preferable. By setting the first storage amount to the lower limit or more, it is possible to secure sufficient energy to move the mobile body V to a safe place. In addition, when the first storage amount is set to the upper limit or less, a material that is relatively easily heated such as NiCoMn (Ni: Co: Mn = 8: 1: 1), NiCoAl, or the like is used as the active material of the storage element 4 Even if the storage element 4 is damaged and an internal short circuit occurs, abnormal heat generation can be suppressed. When using a material which is relatively difficult to generate heat, such as NiCoMn (Ni: Co: Mn = 1: 1: 1) or manganese spinel as the active material of the storage element 4, the first storage amount is, for example, 40% of the storage capacity. It may be about%.

  As a lower limit of the time required to reduce the storage amount of the storage element 4 from the fully charged state to the first storage amount, 60 seconds is preferable, and 300 seconds is more preferable. On the other hand, the upper limit of the time required to reduce the storage amount of the storage element 4 to the first storage amount is preferably 25 minutes, and more preferably 15 minutes. By setting the time required to reduce the storage amount of storage element 4 to the first storage amount or more, the configuration for discharging can be simplified. Further, by setting the time required to reduce the storage amount of the storage element 4 to the first storage amount or less, the abnormal heat generation of the storage element 4 and the generation of white smoke can be reliably prevented.

  The second storage amount is a storage amount corresponding to a voltage at which the storage element 4 is not damaged even if a person receives an electric shock, preferably, a voltage hardly recognizable.

  Specifically, it is preferable that the second charge amount be closer to 0 V, which is the theoretical lower limit. On the other hand, 50 V is preferable as the upper limit of the second charge amount. By setting the second storage amount equal to or less than the upper limit, there is no danger even in the event of an electrical leakage from the storage element 4 to a human body, and it is possible to prevent hindrance to the rescue activities of the occupants of the moving body V, etc. Can.

  The lower limit of the time required to reduce the storage amount of the storage element 4 from the first storage amount to the second storage amount is not particularly limited, and the electrical resistance of the circuit for discharge (hereinafter referred to as discharge circuit) can be The time may be made as small as possible depending on the internal resistance of the storage element 4. On the other hand, the upper limit of the time required to reduce the storage amount of the storage element 4 from the first storage amount to the second storage amount is preferably 6 minutes, and more preferably 4 minutes. By setting the time required to reduce the storage amount of storage element 4 from the first storage amount to the second storage amount below the upper limit, discharge is completed before a third party such as a rescue worker touches mobile V The probability of doing so is high, and electric shock can be prevented more reliably.

  The first discharge control unit 6, the second discharge control unit 7, and the abnormality detection unit 8 may be independent control devices, but may be realized by a single control device. That is, the first discharge control unit 6, the second discharge control unit 7, and the abnormality detection unit 8 may be different control programs executed by a single or a plurality of computers, subprograms, subroutines, etc. May be described.

  Each of the first discharge control unit 6, the second discharge control unit 7, and the abnormality detection unit 8 may have, for example, physically functioning components such as a discharge circuit, a sensor, and a switch. Alternatively, it is configured to have an input / output interface of signals between the mobile unit V or the storage element module 2, and to perform the respective physical functions by the components of the storage element module 2. It is also good.

  For example, the first discharge control unit 6 or the second discharge control unit 7 may be configured to operate the brake of the movable body V and the drive motor simultaneously in order to discharge the storage element 4. According to this configuration, a dedicated discharge circuit for discharging the storage element 4 is not necessary, so the configuration is relatively simple and can be repeatedly used.

  Further, the first discharge control unit 6 or the second discharge control unit 7 may be configured to short the storage element 4 via a cooling member through which the cooling water passes. That is, by using the discharge circuit using the cooling member through which the cooling water passes as the discharge resistance, the thermal energy released by the discharge can be taken away by the cooling water, so that the quick discharge can be performed safely. A water-cooled plate for cooling the storage element 4 can be used as the cooling member. That is, the storage element 4 can be safely discharged by supplying current to the casing of the water cooling plate and taking away the generated heat by the cooling water.

  While the first discharge control unit 6 needs to stop the discharge with an appropriate storage amount, the second discharge control unit 7 does not need to stop the discharge. Therefore, it is preferable that the first discharge control unit 6 be configured to discharge the storage element 4 using an electric load or a resistor. The second discharge control unit 7 can be configured to place the storage element 4 in a short circuit state.

  The second discharge control unit 7 may be configured to forcibly operate the rapid discharge device of the storage element 4 when the storage element 4 has a rapid discharge device for detecting a temperature rise or the like and discharging.

  The first discharge control unit 6 and the second discharge control unit 7 may be configured to discharge the plurality of storage elements 4 individually, and are configured to collectively discharge the plurality of storage elements 4 in the storage module 2 May be

  The abnormality detection unit 8 may detect an abnormality of the movable body V by a signal of a mechanism or sensor provided in the movable body V such as a detection mechanism for operating the air bag, for example. In order to detect an abnormality, for example, a sensor such as an acceleration sensor or an impact sensor or a detection mechanism may be provided.

  The abnormality detection unit 8 may have a mechanism that monitors the potential difference between the plurality of storage elements 4 as a detection mechanism that detects an abnormality of the storage element 4. In this case, preferably, the abnormality detection unit 8 is configured to determine that the storage element 4 is abnormal when the potential difference between the plurality of storage elements 4 becomes equal to or more than a predetermined threshold. That is, the abnormality detection unit 8 is configured to detect a voltage drop of a part of the storage elements 4 that indicates the possibility of an internal short circuit of the storage element 4 or a leak, so that the necessity of the discharge of the storage elements 4 is more accurate. It can be judged.

  Hereinafter, an exemplary configuration of power storage system 1 will be described in detail.

  As illustrated in FIG. 2, the storage module 2 includes a plurality of storage elements 4 and a partition member 10 disposed one by one between the storage elements 4. The storage module 2 further includes a holding member 11 for holding the storage element 4 and the partition member 10, a bus bar 12 for electrically connecting the plurality of storage elements 4, and a cooling member 13 for cooling the plurality of storage elements 4. Further equipped.

  Each storage element 4 is sealed in a case 14 in which an electrode body formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween is immersed in an electrolytic solution.

  The case 14 may be, for example, a flexible bag formed of a laminate sheet in which a metal foil and a resin film are joined, or a rigid container formed of a resin or metal. As illustrated, the case 14 may be a box-shaped (rectangular parallelepiped) metal container which is excellent in strength and can reduce a dead space.

  The case 14 is provided with a pair of external terminals (a positive electrode external terminal 15 and a negative electrode external terminal 16). The positive electrode external terminal 15 is electrically connected to the positive electrode plate of the electrode body, and the negative electrode external terminal 16 is electrically connected to the negative electrode plate of the electrode body.

  It is preferable to use, as the electrode body, a laminate-type electrode body formed by laminating a plurality of flat positive electrode plates, a negative electrode plate and a separator, since the space efficiency can be improved and the energy density can be increased. Alternatively, as the electrode body, a winding type may be used, which is formed by winding a long positive electrode plate, a negative electrode plate and a separator in a flat shape in a sectional view.

  The number of positive electrode plates stacked in the stacked type electrode body can be, for example, 40 to 60 in order to increase the capacity of the storage element 4. In the laminated type electrode body, in order to suppress internal short circuit due to electrodeposition, it is preferable that the negative electrode plate be disposed outside the positive electrode plate on both sides in the stacking direction. Therefore, it is preferable that the number of negative electrode plates be one more than the number of positive electrode plates.

  The positive electrode plate of the electrode body can be configured to have a conductive foil- or sheet-like positive electrode base material and a positive electrode active material layer laminated on both sides of the positive electrode base material.

  As a material of the positive electrode substrate of the positive electrode plate, a metal such as aluminum, copper, iron, nickel or an alloy thereof is used. Among these, aluminum, an aluminum alloy, copper and a copper alloy are preferable, and aluminum and an aluminum alloy are more preferable, from the balance of the height of conductivity and the cost. Moreover, as a shape of a positive electrode base material, foil, a vapor deposition film, etc. are mentioned, From the surface of cost, foil is preferable. That is, an aluminum foil is preferable as the positive electrode substrate. In addition, as aluminum or aluminum alloy, A1085P, A3003P etc. which are prescribed | regulated to JIS-H4000 (2014) can be illustrated.

  The positive electrode active material layer of the positive electrode plate is a porous layer formed of a so-called mixture containing a positive electrode active material. Moreover, the composite material which forms a positive electrode active material layer contains arbitrary components, such as a electrically conductive agent, a binder (binder), a thickener, a filler, as needed.

As the positive electrode active material, for example, _Li x _MO y composite oxide (M is at least representative of a kind of transition metal) represented by _{(Li x CoO 2, Li x} NiO 2, Li x Mn 2 O 4, Li x MnO ₃ , Li _x Ni _α Co _(1-α) O ₂ , Li _x Ni _α Mn _β Co _(1-α-β) O ₂ , Li _x Ni _α Mn _(2-α) O ₄ etc., Li _w A polyanion compound (LiFePO ₄ , LiMnPO ₄ , LiNiPO ₄ , LiCoPO ₄ ) represented by Me _x (XO _y ) _z (Me represents at least one transition metal and X represents, for example, P, Si, B, V, etc.) And Li ₃ V ₂ (PO ₄ ) ₃ , Li ₂ MnSiO ₄ , Li ₂ CoPO ₄ F, and the like. The elements or polyanions in these compounds may be partially substituted by other element or anion species. In the positive electrode active material layer, one of these compounds may be used alone, or two or more thereof may be mixed and used. The crystal structure of the positive electrode active material is preferably a layered structure or a spinel structure.

  The negative electrode plate has a conductive foil-like to sheet-like negative electrode base material and a porous negative electrode active material layer laminated on both sides of the negative electrode base material.

  As a material of the negative electrode substrate of the negative electrode plate, copper or a copper alloy is preferable. Moreover, as a shape of a negative electrode base material, foil is preferable. That is, copper foil is preferable as the negative electrode substrate of the negative electrode plate. As a copper foil used as a negative electrode base material, a rolled copper foil, an electrolytic copper foil, etc. are illustrated, for example.

  The negative electrode active material layer is a porous layer formed of a so-called mixture containing a negative electrode active material. Moreover, the composite material which forms a negative electrode active material layer contains arbitrary components, such as a conductive agent, a binder (binder), a thickener, and a filler, as needed.

  As the negative electrode active material, a material capable of inserting and extracting lithium ions is preferably used. Specific negative electrode active materials include, for example, metals such as lithium and lithium alloy, metal oxides, polyphosphate compounds, and carbon materials such as graphite and amorphous carbon (graphitizable carbon or non-graphitizable carbon). Etc.

  Among the above-mentioned negative electrode active materials, it is preferable to use Si, Si oxide, Sn, Sn oxide or a combination of these, from the viewpoint of setting the discharge capacity per unit opposing area between the positive electrode plate and the negative electrode plate to a suitable range. It is particularly preferable to use Si oxide. In addition, when made into an oxide, Si and Sn can have about 3 times the discharge capacity of graphite.

  The separator is formed of a sheet-like or film-like material to which the electrolytic solution infiltrates. As a material for forming the separator, for example, woven fabric, non-woven fabric or the like can be used, but typically, a sheet-like or film-like resin having porosity is used. The separator separates the positive electrode plate and the negative electrode plate, and holds the electrolytic solution between the positive electrode plate and the negative electrode plate.

  As a main component of this separator, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, polyolefin derivatives such as chlorinated polyethylene, ethylene-propylene copolymer Polyolefins such as coalescing, and polyesters such as polyethylene terephthalate and copolyester can be employed. Among them, polyethylene and polypropylene, which are excellent in electrolytic solution resistance, durability and weldability, are preferably used as the main component of the separator.

  The separator preferably has a heat resistant layer or an oxidation resistant layer on both sides or one side (preferably, the side facing the positive electrode plate). In addition, the "heat-resistant layer" means what prevents the failure | damage by the heat of a separator, and prevents a short circuit with a positive electrode plate and a negative electrode plate more reliably. On the other hand, "the oxidation resistant layer" means a layer which protects the separator under a high voltage environment but does not give the separator sufficient heat resistance.

  The heat-resistant layer or the oxidation resistant layer of the separator can be configured to include a large number of inorganic particles and a binder for connecting the inorganic particles.

  As a main component of the inorganic particles, for example, oxides such as alumina, silica, zirconia, titania, magnesia, ceria, yttria, zinc oxide, iron oxide, nitrides such as silicon nitride, titanium nitride, boron nitride, silicon carbide, carbonate Calcium, aluminum sulfate, aluminum hydroxide, potassium titanate, talc, kaolin clay, kaolinite, halloysite, pyrophyllite, montmorillonite, sericite, mica, amesite, bentonite, asbestos, zeolite, calcium silicate, magnesium silicate Etc. Among them, as a main component of the inorganic particles of the heat-resistant layer or the oxidation resistant layer, alumina, silica and titania are particularly preferable.

As an electrolytic solution to be enclosed in the case 14 together with the electrode body, a known electrolytic solution generally used for a storage element can be used. For example, cyclic carbonates such as ethylene carbonate, propylene carbonate and butylene carbonate, or diethyl carbonate, dimethyl carbonate, ethyl A solution in which lithium hexafluorophosphate (LiPF ₆ ) or the like is dissolved in a solvent containing a linear carbonate such as methyl carbonate can be used.

  The partition member 10 is disposed between the storage elements 4, and when any storage element 4 is not in a normal use state, but is damaged due to a collision accident of the moving body V or the like and becomes an overheated state due to an internal short circuit, Adjacent storage elements 4 are prevented from being heated and falling into a continuous overheating state.

  As the partition member 10, for example, a plate-like to sheet-like material having a small thermal conductivity such as mica laminated material, vacuum heat insulating material (in which the inside of a bag containing a porous core material is evacuated) is used. . Moreover, it is preferable that the partition member 10 has insulation.

  The holding member 11 holds the plurality of power storage devices 4, the plurality of partition members 10, and the cooling member 13. The holding member 11 can have, for example, a rack shape, a frame shape, or a box shape.

  Preferably, the holding member 11 arranges the plurality of power storage devices 4 so that the long side surfaces thereof face each other, and holds the partition member 10 between the long side surfaces of the power storage devices 4. In addition, as shown in FIG. 2, the holding member 11 preferably holds the cooling member 13 adjacent to a surface different from the surface (long side surface) opposite to the partition member 10 of the storage element 4.

  The holding member 11 preferably compresses and holds the storage element 4 and the partition member 10 in the arrangement direction. As a configuration for pressing and holding the storage element 4 and the partition member 10, for example, a configuration in which a pressing plate 17 for pressing the storage element 4 is pressed by a push bolt 18 as shown in the drawing, a configuration using an elastic member such as a spring Can be adopted. Thus, by holding the storage element 4 and the partition member 10 in a compressed manner, a dead space is not formed between the storage element 4 and the partition member 10, and the energy density of the storage module 2 can be increased. Since the storage element 4 and the partition member 10 need not be held, the configuration of the holding member 11 can be simplified.

  The bus bar 12 may connect the positive external terminal 15 of the storage element 4 and the negative external terminal 16 of the storage element 4 adjacent to each other, and electrically connect the plurality of storage elements 4 in series. The bus bar 12 may connect a plurality of storage elements 4 in parallel.

  Cooling member 13 is arranged to extend in the arrangement direction of the plurality of storage elements 4 so as to be adjacent to the plurality of storage elements 4, and deprives the heat of each storage element 4. The cooling member 13 cools the storage element 4 to suppress heat accumulation in the storage element 4 in a normal use state.

  Further, the cooling member 13 has a wiring (not shown) in order to use it as a conductor for shorting the storage element 4 when the first discharge control unit 6 or the second discharge control unit 7 discharges the storage element 4. It may be connected.

  The cooling member 13 may be an air-cooled type, but in particular, it is configured to pass a refrigerant such as cooling water inside so that heat can be efficiently transferred out of the storage module 2 when the storage element is discharged. preferable.

  A heat transfer sheet formed of, for example, a resin, a gel, or the like may be disposed between the cooling member 13 and each storage element 4 in order to prevent formation of a gap and to improve heat conduction.

  In the storage system 1, the discharge control device 3 can be used to implement the discharge control method of the storage element according to an embodiment of the present invention.

  In the discharge control method, as shown in FIG. 5, an abnormality of the moving body V and the storage element 4 is detected (step S 1: abnormality detection step), an abnormality of the moving body V or an abnormality of the storage element 4 is detected. And forcibly discharging the storage element 4 to a first storage amount capable of driving the moving body V (step S2: first discharging step) and discharging the storage element 4 to the first storage amount Detecting the stop of the mobile body V (step S3: stop detection step) and discharging the storage element 4 to a second storage amount lower than the first storage amount when the mobile body stops (step S3) S4: A second discharge step).

  In the abnormality detection step of step S <b> 1, the abnormality detection unit 8 monitors the presence or absence of the abnormality of the mobile body V or the abnormality of the storage element 4.

  In addition, as abnormality of the mobile body V, the event which may damage the electrical storage module 2, such as a collision of a mobile body, etc. is illustrated. For this reason, when the negative acceleration (deceleration) of the mobile V exceeds a predetermined threshold value, it can be determined that the mobile V is abnormal, for example, when a constant force acts on the front of the mobile V. Such detection of abnormality of the mobile V may be detected by the abnormality detector 8 receiving a detection signal of the detection mechanism of the mobile V.

  Further, as an abnormality of the storage element 4, an event in which there is a high probability that an internal short circuit, an external short circuit, or a short circuit has occurred in the storage element 4 is exemplified. For this reason, the voltage difference between the storage elements 4 caused by the voltage of the storage element 4 in which the internal short circuit or the leakage occurs is sharply dropped compared to the voltage of the other storage elements 4 is monitored. When it exceeds a certain threshold (for example, 100 mV), it can be determined that the storage element 4 is abnormal. Further, the abnormality of the storage element 4 may be determined by, for example, the internal pressure of the storage element 4, temperature, or the like.

  In the first discharge step of step S2, the first discharge control unit 6 discharges the storage element 4 to the first storage amount. As a specific example, the storage element 4 is discharged by opening and closing a switch connecting the storage element 4 to a dedicated discharge circuit (for example, a circuit for shorting between the positive electrode external terminal 15 and the negative electrode external terminal 16 via the cooling member 13 etc.) be able to.

  In the stop detection step of step S3, the complete stop of the movable body V after the first discharge step is confirmed. Specifically, this determination is made by activating the parking brake. It should be noted that after the end of the first discharge step, when the moving body V does not move for a predetermined grace period or longer, and when the moving body V stops and then stops for a predetermined stop time or more, It can also be judged.

  As a lower limit of the said grace period in the case of detecting a stop by movement and stop after the end of the said 1st discharge process, 2 minutes are preferable and 3 minutes are more preferable. On the other hand, as a maximum of grace period, 10 minutes are preferred and 8 minutes are more preferred. By setting the grace time to the above-mentioned lower limit or more, it is possible to give the driver of the mobile V a sufficient time until it thinks of evacuating the mobile V to a safe place. In addition, by setting the grace period to the upper limit or less, it is possible to effectively suppress the electric shock of a third party such as a rescue worker.

  As a lower limit of the said stop time in the case of detecting a stop by the movement and the stop after completion | finish of a said 1st discharge process, 30 seconds are preferable and 60 seconds are more preferable. On the other hand, as an upper limit of stop time, 5 minutes are preferable and 3 minutes are more preferable. By making the stop time equal to or more than the lower limit, it becomes possible to switch back the mobile unit V or move to the side of the road once and then search for a safer place and evacuate. In addition, by setting the stop time to the upper limit or less, it is possible to effectively suppress an electric shock from a third party such as a rescue worker.

  In the second discharge step of step S4, the second discharge control unit 7 discharges the storage element 4 to the second storage amount. As a specific example, the first discharge control unit 6 shorts between the positive electrode external terminal 15 and the negative electrode external terminal 16 of the storage element 4 or operates the driving motor of the moving body V and the brake at the same time. Can.

  As described above, in the discharge control method, when abnormality of the mobile unit V or the storage element 4 is detected, the mobile unit V is discharged while discharging the storage element 4 to the first storage amount to reduce unsafe state. Allows a minimum degree of movement to a safe position. Thereby, the abnormal heat generation of the storage element 4 can be prevented, and the moving body V can be moved to prevent an accident of another moving body.

  Furthermore, since the storage control device 4 discharges the storage element 4 to the second storage amount when the movable body V is stopped after the first discharge step, the electric discharge control method can prevent an electric shock accident due to a short circuit of the storage element 4.

Other Embodiments
The embodiment does not limit the configuration of the present invention. Therefore, the embodiment can omit, substitute, or add the components of each part of the embodiment based on the description of the present specification and common technical knowledge, and all of them can be construed as belonging to the scope of the present invention. It should.
Although the discharge control device 3 is configured to be connected to the storage module 2 (mounted on the mobile unit V) in the above embodiment, the present invention is not limited to this. The discharge control device may be a remote monitoring device. The discharge control device may be realized by a server (for example, a cloud computer) installed at a remote place and a battery management system (BMS) including a cell monitoring unit (CMU) mounted on a mobile.

  The discharge control device, the storage system and the storage device discharge control method according to the present invention can be particularly suitably applied to vehicles such as electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs).

DESCRIPTION OF SYMBOLS 1 storage system 2 storage module 3 discharge control device 4 storage element 5 storage pack 6 first discharge control unit 7 second discharge control unit 8 abnormality detection unit 9 stop detection unit 10 partition member 11 holding member 12 bus bar 13 cooling member 14 case 15 Positive external terminal 16 Negative external terminal 17 Compression plate 18 Pushing bolt V Moving body

Claims (7)

Mounted on a mobile body as a drive energy source and connected to a storage module having a plurality of storage elements,
A first discharge control unit that forcibly discharges the storage element to a first storage amount capable of driving the movable body;
A second discharge control unit that discharges the storage element to a second storage amount lower than the first storage amount when the movable body stops after discharging the storage element to the first storage amount And a discharge control device. The discharge control device according to claim 1, wherein the first storage amount is 5% or more and 25% or less of the storage capacity of the storage element. The discharge control device according to claim 1, further comprising: an abnormality detection unit that detects that a potential difference between the plurality of storage elements is equal to or more than a predetermined threshold value. The first discharge control unit or the second discharge control unit is configured to operate at least one of a brake and a drive motor of the moving body in order to discharge the storage element. Or the discharge control apparatus of Claim 3. The said 1st electric discharge control part or the said 2nd electric discharge control part is comprised so that the said electrical storage element may be short-circuited via the cooling member which a cooling fluid passes in an inside. Discharge control device. A discharge control device according to any one of claims 1 to 5;
A storage module having a plurality of storage elements to which the discharge control device is connected. Forcibly discharging the storage element to a first storage amount capable of driving the moving body in a moving body mounted with a storage module having a plurality of storage elements as a driving energy source;
Discharging the storage element to a second storage amount lower than the first storage amount when the mobile body is stopped after discharging the storage element to the first storage amount. Device discharge control method.

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