JP2009289668A - Power storage device and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power storage device which detects precisely generation of gas and can suppress the increase in the internal pressure of a housing container. <P>SOLUTION: The power storage device comprises a battery pack 12, a battery housing case 13 for housing the battery pack inside the pack 12; a cooling liquid 23 which fills the inside of the battery housing case 13 and carries out heat exchange with the battery pack 12; a pressure sensor 41, which obtains information regarding the internal pressure of the battery housing case 13; and a capsule 31 which is installed inside the battery housing case 13. In gas generating state in which gas is generated from the battery pack 12, the capsule 31 does not contract so as to allow increase in the internal pressure of the battery housing case 13, until the internal pressure value of the battery housing case 13 reaches at least the detection value of the pressure sensor 41; and when the internal pressure value increases to a prescribed value which exceeds the detection pressure value, it is destroyed. An elastic body 32, which is compressed by the internal pressure of the battery housing case 13 when the capsule 31 is destroyed, is stored inside the capsule 31. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power storage unit and a power storage device in which a liquid heat exchange medium that performs heat exchange with the power storage unit is stored in a storage container, and a vehicle.

  There is known a power storage device in which a power storage unit having a high heat generation density is stored in a storage container together with oil (see Patent Document 1). This power storage device has a structure for releasing the gas generated from the power storage unit to the outside of the storage container.

  Although not a battery cooling structure, a gas ball made of an elastic resin material (hereinafter referred to as an elastic member) is housed in a floating state in the oil chamber of the cylinder, and the gas is sealed inside the elastic member. A hydraulic shock absorber configured to expand and contract an elastic member according to pressure is known (see Patent Document 2).

Further, a pressure sensor for detecting the internal pressure can be provided inside the storage container. The pressure sensor outputs a signal to the controller when the internal pressure of the container becomes a predetermined pressure, and the controller cuts off the current of the power storage unit.
JP-A-63-98953 JP-A-6-221361 JP-A-7-71611

  However, when gas is generated from the power storage unit, the elastic member contracts to suppress an increase in the internal pressure of the storage container. For this reason, the pressure sensor does not operate, and there is a possibility that the generation of gas cannot be detected.

  On the other hand, when the amount of gas released from the power storage unit is large, it is necessary to quickly suppress the increase in internal pressure of the storage container.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a power storage device that can accurately detect the generation of gas and suppress an increase in internal pressure of a storage container.

  In order to solve the above problems, a power storage device according to the present invention includes (1) a power storage unit, a storage container that stores the power storage unit, a liquid that fills the inside of the storage container and performs heat exchange with the power storage unit. A heat exchange medium, a detection element that acquires information about an internal pressure value of the storage container, a storage unit that is provided inside the storage container and has a space isolated from the heat exchange medium, and In a gas generation state in which gas is generated from the power storage unit, the storage unit allows an increase in the internal pressure of the storage container until the internal pressure value of the storage container reaches at least a detection pressure value of the detection element, and the internal pressure value is When the pressure rises to a predetermined pressure value exceeding the detected pressure value, it is destroyed, and in the space of the storage portion, there is stored a compression body that is compressed by the internal pressure of the storage container when the storage portion is destroyed. It is characterized by.

  According to the configuration of (1), since the increase in the internal pressure of the storage container is allowed until the detection pressure value of the detection element is reached, generation of gas from the power storage unit can be accurately detected. Moreover, since a compression body is compressed when a storage part is destroyed, a pressure rise can be relieved.

  (2) In the configuration of (1), the storage portion can be formed in a capsule shape. Since it is only necessary to form the capsule separately and put it into the container, the power storage device (1) can be obtained by a simple method.

  (3) In the configuration of (1), the storage portion can be formed along the inner surface of the storage container. Thereby, a storage part and a storage container can be unitized.

  (4) In the configuration of (1), the power storage unit includes a support member that supports the power storage element, and the storage unit can be formed in the support member. Thereby, a storage part and a support member can be unitized. Furthermore, the dead space inside the support member can be effectively utilized.

  (5) In the configurations of (1) to (4), the power storage unit is connected to a controller, and when the internal pressure value of the storage container reaches the detected pressure value, the controller Shut off. Thereby, according to generation | occurrence | production of the gas from an electrical storage part, the electric current of an electrical storage part can be interrupted | blocked.

  (6) In the configuration of (5), a discharge pipe for discharging the gas generated from the power storage unit to the outside is connected to the storage container, and when the operating pressure value is reached in the discharge pipe A valve that allows gas to be discharged from the discharge pipe is provided, and the operating pressure value is higher than the detected pressure value. Thereby, when there is little discharge | release of the gas from an electrical storage part, the electric current of an electrical storage part can be interrupted | blocked. Furthermore, when there is a lot of gas release from the power storage unit, in addition to cutting off the current of the power storage unit, the pressure rise can be mitigated by the compression action of the compressor and the gas discharge action from the discharge pipe. .

  (7) In the configurations of (1) to (6), the space of the storage unit further includes at least one of a neutralizing agent, a coolant, and a flame retardant that neutralizes the electrolyte flowing out from the power storage unit. Can be stored. Thereby, the electrolyte solution which flowed out from the electrical storage part can be neutralized, or an electrical storage part can be cooled.

  (8) In the configurations of (1) to (7), the power storage unit may be a power storage module in which a plurality of power storage elements are connected. That is, the present invention can also be applied to a power storage unit with a high calorific value.

  (9) In the configurations of (1) to (8), the storage unit does not contract until the detected pressure value is reached. Here, “does not contract” means to exclude the case where “the storage unit contracts when gas is generated and the internal pressure of the container does not satisfy the detected pressure value of the pressure sensor”. The case of slight contraction and slight increase in pressure is within the scope of the present invention.

  (10) In the configurations of (1) to (9), at least a part of the outer wall of the storage portion can be made of glass. Accordingly, when the gas is released from the power storage unit, it is possible to reliably allow the increase in the internal pressure of the storage container until the internal pressure of the storage container reaches the detection pressure value of the pressure sensor.

  (11) In the configurations of (1) to (10), air can be used as the compression body stored in the space of the storage unit. Thereby, cost can be reduced.

  According to another aspect of the power storage device of the present invention, (12) a power storage unit, a storage container that stores the power storage unit, and a liquid heat exchange medium that fills the inside of the storage container and exchanges heat with the power storage unit And a storage part provided in the storage container and having a space isolated from the heat exchange medium, and in a gas generation state where gas is generated from the power storage part, the storage part contracts It is destroyed without doing, and the compression body compressed by the internal pressure of the storage container when the storage part is destroyed is stored in the space of the storage part. By compressing the compression body, it is possible to suppress an increase in internal pressure of the storage container. Example 1 can be used as the basic configuration of the power storage device of (12). However, the pressure sensor can be omitted.

  According to the present invention, it is possible to accurately detect that gas is generated from the power storage unit. Moreover, when the compression body compresses, an increase in the internal pressure of the storage container can be suppressed.

  Examples of the present invention will be described below.

  FIG. 1 is a cross-sectional view of the power storage device taken along the YZ plane, and the X axis, the Y axis, and the Z axis indicate three axes that are orthogonal to each other. In the figure, the power storage device 1 includes an assembled battery (power storage unit, power storage module) 12, an assembled battery 12, and a battery storage case (storage container) 13 that stores a coolant (liquid heat exchange medium) 23. The battery housing case 13 includes a case main body 13a and an upper lid 13b. The power storage device 1 of the present embodiment can be used for driving an electric vehicle, a hybrid vehicle, a fuel cell vehicle, or an auxiliary power source.

  The case body 13a is open on the upper side, and an upper lid 13b is fixed to the upper end surface of the case body 13a. A bolt (not shown) can be used as the fixing means. For the battery housing case 13, a metal having high thermal conductivity and high pressure resistance can be used. For example, iron can be used. A plurality of heat dissipating fins (not shown) can be formed on the outer surface of the battery housing case 13. By providing a plurality of heat radiation fins, the heat radiation area of the battery housing case 13 can be increased.

  The battery housing case 13 can be fixed to the floor panel 2 located below a seat (not shown). However, it can also be arranged in a space formed between the rear seat and the trunk room. A gas discharge port 113b for discharging gas generated from the assembled battery 12 is formed in the upper lid 13b. The gas discharge port 113b is located substantially at the center of the upper lid 13b when viewed in the Z-axis direction. The inner surface of the upper lid 13b (the surface on the side in contact with the coolant 23) extends along the XY plane. However, the inner surface of the upper lid 13b may be an inclined surface that is inclined upward as it approaches the gas discharge port 113b. In this case, since the gas released from the assembled battery 12 travels along the inclined surface, the gas discharge can be accelerated.

  A gas discharge pipe 15 is connected to the gas discharge port 113b. Resin and metal can be used for the gas discharge pipe 15. The gas discharge pipe 15 extends toward a region (for example, a quarter trim of the vehicle) that is a position outside the passenger compartment. A gas relief valve 21 is provided at a connection portion between the gas discharge pipe 15 and the gas discharge port 113b.

  The gas relief valve 21 operates when the internal pressure of the battery housing case 13 reaches a predetermined value (operating pressure value), and allows gas to move from the battery housing case 13 to the gas discharge pipe 15. Note that when the gas relief valve 21 is in an inoperative state, the movement of the coolant 23 from the battery housing case 13 to the gas discharge pipe 15 is prohibited. The operating pressure value of the gas relief valve 21 can be set to 2 atm, for example.

  The inside of the battery housing case 13 is filled with the coolant 23. The cooling liquid 23 is an incompressible fluid and has a high specific heat, thermal conductivity, high boiling point, and does not corrode the battery housing case 13 and the assembled battery 12, and is not susceptible to thermal decomposition, air oxidation, electrolysis, or the like. ing. Furthermore, an electrically insulating liquid is desirable in order to prevent a short circuit between the electrode terminals. For example, a fluorinated inert liquid can be used. As the fluorine-based inert liquid, Fluorinert, Novec HFE (hydrofluorether), and Novec 1230 manufactured by 3M can be used. In addition, a liquid other than the fluorine-based inert liquid (for example, silicon oil) can be used.

  The assembled battery 12 is configured by electrically connecting a plurality of cylindrical batteries 122, and the amount of heat generation increases as the number increases. For this reason, in the method of cooling the assembled battery 12 with air, there is a risk that the battery will deteriorate due to insufficient cooling. Therefore, in this embodiment, a liquid having a cooling performance superior to that of air is used as a cooling medium for cooling the assembled battery 12.

  A pressure sensor (detection element) 41 is attached to the inner surface of the upper lid 13b at a position different from the gas discharge port 113b. The pressure sensor 41 is connected to the monitoring unit 42 via a signal line 48. The pressure sensor 41 outputs an electrical signal to the monitoring unit 42 when the internal pressure of the battery housing case 13 rises to a predetermined value (detected pressure value). In the monitoring unit 42, a function as a monitoring unit that monitors the SOC (state of charge) of the assembled battery 12 may be used.

  The monitoring unit 42 is connected to the controller 43 via a signal line 49. The controller 43 blocks the current of the assembled battery 12 based on the signal output from the monitoring unit 42. The monitoring unit 42 and the controller 43 can be housed in a junction box 44 disposed adjacent to the battery housing case 13. Note that the monitoring unit 42 may be provided inside the controller 43.

  Note that the internal pressure value of the battery housing case 13 may be constantly output to the monitoring unit 42 from the pressure sensor. In this case, the monitoring unit 42 outputs a signal to the controller 43 when the monitored internal pressure of the battery housing case 13 reaches a predetermined value (detected pressure value). That is, the “detected pressure value” indicates the internal pressure value of the battery housing case 13 when the instruction signal for cutting off the current of the assembled battery 12 is output. The detected pressure value by the pressure sensor 41 can be set to 1.5 atm, for example.

  Next, the configuration of the assembled battery 12 will be described. The assembled battery 12 includes a plurality of cylindrical batteries 122. Each cylindrical battery 122 extends in the Y-axis direction. These cylindrical batteries 122 are supported by a pair of battery folders (supporting members) 123 arranged to face each other. Protruding terminal electrodes 131 and 132 are provided at both ends of each cylindrical battery 122. Screw grooves 131 a and 132 a are formed on the outer surfaces of the terminal electrodes 131 and 132.

  The terminal electrodes 131 and 132 protrude from the battery folder 123. Cylindrical batteries 122 are connected in series via bus bars 124. The bus bar 124 is formed in a flat plate shape. The bus bar 124 has openings (not shown) through which the terminal electrodes 131 and 132 are passed. The bus bar 124 is fixed by fastening the fastening nut 125 to the thread grooves 131a and 132a of the terminal electrodes 131 and 132.

  The configuration of the cylindrical battery 122 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view of the cylindrical battery 122 cut along the YZ plane. A power generation element 135 is housed in the unit cell case 134 in a wound state.

  The power generation element 135 includes a positive electrode body 135b, a negative electrode body 135c, and a separator 135a disposed between the positive electrode body 135b and the negative electrode body 135c. Here, the positive electrode body 135b includes a current collector and a positive electrode layer formed on the surface of the current collector. The positive electrode layer can be formed on one side or both sides of the current collector. The positive electrode layer is a layer containing an active material, a conductive agent, or the like corresponding to the positive electrode.

  The negative electrode body 135c is composed of a current collector and a negative electrode layer formed on the surface of the current collector. The negative electrode layer can be formed on one side or both sides of the current collector. The negative electrode layer is a layer containing an active material, a conductive agent, or the like corresponding to the negative electrode.

  Note that an electrode (a so-called bipolar electrode) in which a positive electrode layer is formed on one surface of the current collector and a negative electrode layer is formed on the other surface of the current collector can also be used. In this embodiment, an electrolytic solution is used, but a solid electrolyte formed of particles can also be used. Examples of the solid electrolyte include a polymer solid electrolyte and an inorganic solid electrolyte.

Here, when the cylindrical battery 122 is a nickel-hydrogen battery, nickel oxide is used as the active material for the positive electrode layer, and MmNi _(5-xyz) Al _x is used as the active material for the negative electrode layer. Mn _y Co _z: can be used (Mm misch metal) hydrogen absorbing alloy or the like. When the unit cell 1 is a lithium ion battery, a lithium-transition metal composite oxide can be used as the active material for the positive electrode layer, and carbon can be used as the active material for the negative electrode layer. As the conductive agent, acetylene black, carbon black, graphite, carbon fiber, or carbon nanotube can be used.

  Disc-shaped collector plates 136 are welded to both ends of the power generation element 135 in the battery longitudinal direction (Y direction). As the current collector plate 136, an aluminum foil, a stainless steel foil, or a copper foil can be used. The current collecting plate 136 is electrically and mechanically connected to the holding plate 139 through a conductive wire 137. The holding plate 139 holds the terminal electrodes 131 and 132. In the holding plate 139, a destructive valve 139 a is formed at a position different from the position where the terminal electrodes 131 and 132 are attached. The destructive valve 139a is formed by punching the holding plate 139.

  When the cylindrical battery 122 is overcharged, overdischarged, etc., the electrolyte contained in the power generation element 135 is electrolyzed to generate gas, and the internal pressure of the unit cell case 134 increases. When the internal pressure of the cell case 134 becomes a predetermined value (for example, 2 atm) or more, the destructive valve 139a is destroyed and gas is released to the outside of the cylindrical battery 122. Thereby, the internal pressure rise of the cell case 134 can be suppressed.

  A capacitor (power storage unit) may be used instead of the cylindrical battery 122. The capacitor is an electric double layer capacitor based on the principle of operation of an electric double layer generated at the interface between activated carbon and electrolyte. When activated carbon is used as a solid and an electrolytic solution (dilute sulfuric acid aqueous solution) is used as a liquid and brought into contact with each other, plus and minus electrodes are relatively distributed at very short intervals on the interface. When a pair of electrodes are immersed in an ionic solution and a voltage is applied to such an extent that electrolysis does not occur, ions are adsorbed on the surface of each electrode, and positive and negative electricity are stored (charging). When electricity is discharged to the outside, positive and negative ions leave the electrode and return to the neutralized state. Further, a square battery can be used instead of the cylindrical battery 122.

  Next, the configuration of the capsule (storage unit) 31 provided inside the battery housing case 13 will be described in detail with reference to FIG. The capsule 31 has a spherical shape and has a storage area portion 31a therein. By forming the capsule 31 into a spherical shape, the capsule 31 can be made thinner while maintaining pressure resistance. The capsule 31 may be made of a material that does not easily contract so as to allow a pressure increase until at least the pressure detected by the pressure sensor 41 is reached. Specifically, glass can be used.

  Here, it is assumed that the capsule 31 is made of an elastic member (for example, rubber). In this case, when gas is generated from the assembled battery 12, the capsule 31 is elastically deformed, and the increase in the internal pressure of the battery housing case 13 is alleviated. Therefore, there is a possibility that the increase in the internal pressure of the battery housing case 13 stops before reaching the detection pressure value of the pressure sensor 41. As a result, the current of the assembled battery 12 cannot be cut off despite the gas being released from the assembled battery 12.

  On the other hand, in the present embodiment, the capsule 31 is made of a material that hardly contracts so as to allow an increase in internal pressure until the pressure value detected by the pressure sensor 41 is reached. Therefore, the gas release phenomenon of the assembled battery 12 can be reliably detected based on the output signal from the pressure sensor 41.

  The capsule 31 is destroyed when the internal pressure of the battery housing case 13 reaches a predetermined pressure value. Here, the “predetermined pressure value” must be set higher than the detected pressure value of the pressure sensor 41 and lower than the limit pressure resistance value of the battery housing case 13. For example, it can be set to 2 atmospheres.

  Next, the effect of filling the inside of the battery housing case 13 with the coolant 23 will be described. FIG. 4 is a comparative example of the present invention and corresponds to FIG. In addition, the same code | symbol is attached | subjected to the part which has the same function as Example 1. FIG. In the comparative example, the liquid level of the coolant 23 is set low, and the air layer 91 is provided between the upper lid 13 b and the coolant 23.

  In the configuration of the comparative example, when gas is generated from the assembled battery 12 due to battery abnormality, the air layer 91 is compressed, and the increase in internal pressure of the battery housing case 13 is mitigated. For this reason, the increase in the internal pressure of the battery housing case 13 stops before reaching the detected pressure value of the pressure sensor 41. Therefore, there is a possibility that the current of the assembled battery 12 cannot be cut off even though the gas is released from the assembled battery 12.

  On the other hand, in the present invention, as shown in FIG. 1, since the inside of the battery housing case 13 is filled with the coolant 23, when the gas is released from the assembled battery 12, the battery is stored according to the amount of gas released. The internal pressure of the case 13 increases (only when the amount of gas released is small). Therefore, the gas release phenomenon of the assembled battery 12 can be reliably detected based on the output signal from the pressure sensor 41.

  Furthermore, in the comparative example, since the amount of the coolant 23 stored in the battery storage case 13 must be measured more accurately, the work efficiency may be reduced. On the other hand, in the present invention, it is only necessary to fill the inside of the battery housing case 13 with the cooling liquid 23, so that strict liquid amount measurement can be omitted.

  The capsule 31 can be formed in a shape other than a spherical shape. For example, it can be formed in a cubic shape, a conical shape, or a cylindrical shape. The capsule 31 floats in the coolant 23 inside the battery container case 13. However, the capsule 31 can also be fixed to the inner surface of the battery housing case 13 and the assembled battery 12.

  An elastic body (compressed body) 32 is stored in the storage area 31 a of the capsule 31. Rubber can be used for the elastic body 32. Instead of the elastic body 32, a compressible gas (for example, air) may be used. Cost can be reduced by using air.

  If the capsule 31 is broken during battery abnormality, the elastic body 32 contracts. Thereby, the internal pressure rise of the battery storage case 13 can be suppressed. When the breaking pressure of the capsule 31 and the operating pressure of the relief valve 21 are set to the same value, the contraction operation of the elastic body 32 and the gas discharge operation from the gas discharge pipe 15 are performed at the same time. An increase in internal pressure of the battery housing case 13 can be suppressed.

  As shown in FIG. 5, the storage region 31 a of the capsule 31 can further store an electrolyte neutralizing agent 33. FIG. 5 is a cross-sectional view showing the internal structure of the capsule 31. When the capsule 31 is broken when the battery is abnormal, the neutralizing agent 33 flows into the coolant 23. The neutralizing agent 33 can neutralize the electrolyte flowing out of the assembled battery 12 together with the gas.

  A coolant 34 can be used in place of the neutralizing agent 33. When the capsule 31 is broken when the battery is abnormal, the coolant 34 flows into the coolant 23. The coolant 34 can suppress an increase in the temperature of the assembled battery 12. In place of the neutralizing agent 33, an anti-inflammatory agent 35 may be used. A combination of these neutralizing agent 33, coolant 34 and flame retardant 35 can also be stored in the capsule 31.

  Next, the operation of the power storage device 1 when the battery is abnormal will be described with reference to FIG. FIG. 3 is a cross-sectional view of the power storage device 1 taken along the YZ plane, and corresponds to FIG. FIG. 3A schematically shows a case where the generation of gas is small, and FIG. 3B schematically shows a case where the generation of gas is large.

  When the assembled battery 12 is overcharged or the like, the electrolytic solution of the cylindrical battery 122 is electrolyzed to generate gas. When the internal pressure of the cell case 134 exceeds a predetermined value due to this gas, the destructive valve 139a is destroyed. When the destructive valve 139a is destroyed, gas is released into the coolant 23 and the internal pressure of the battery housing case 13 increases.

  As shown in FIG. 3A, when the amount of gas released from the assembled battery 12 is small, the capsule 31 does not contract. Moreover, the inside of the battery housing case 13 is filled with the coolant 23 so that an air layer is not provided. Therefore, the internal pressure value of the battery housing case 13 increases according to the gas release amount. When the internal pressure value of the battery housing case 13 reaches the detected pressure value of the pressure sensor 41, a detection signal is output from the pressure sensor 41 to the monitoring unit 42, and the controller 43 cuts off the current of the assembled battery 12.

  When the internal pressure of the battery housing case 13 further increases after the current of the assembled battery 12 is cut off, that is, when the amount of gas released from the assembled battery 12 is large as shown in FIG. 3B. The following operations are performed.

  When the internal pressure of the battery housing case 13 reaches a predetermined value (for example, 2 atm), the capsule 31 is broken and the gas relief valve 21 is activated at the same time. When the capsule 31 is broken, the elastic body 32 contracts and an increase in the internal pressure of the battery housing case 13 can be suppressed. In FIG. 3B, the broken capsule 31 is omitted. When the gas relief valve 21 is operated, the gas inside the battery housing case 13 is discharged from the gas discharge pipe 15. By the contraction operation of the elastic body 32 and the gas discharge operation from the gas discharge pipe 15, an increase in the internal pressure of the battery housing case 13 can be effectively suppressed.

  A power storage device of Example 2 will be described with reference to FIG. FIG. 6 is a cross-sectional view of the power storage device taken along the YZ plane, and corresponds to FIG. The same components as those in the first embodiment are denoted by the same reference numerals. A storage member 36 extending in the X-axis direction along the inner surface of the case main body 13a is provided inside the battery housing case 13. Inside the storage member 36, a rectangular storage area 36a is formed when viewed in the X-axis direction. The storage member 36 can be made of the same material as the capsule 31 of the first embodiment.

  An elastic body 37 is stored in the storage area 36 a of the storage member 36. For the elastic body 37, the same material as that of the elastic body 32 of the first embodiment can be used. Further, the neutralizing agent 33, the coolant 34, and the flame retardant 35 can be stored in the storage area 36a as in the first embodiment.

When the amount of gas released from the assembled battery 12 is small, the storage member 36 does not contract.
When the amount of gas generated from the assembled battery 12 is large, the storage member 36 is destroyed and the elastic body 37 contracts. According to the above-described configuration, the same effect as in the first embodiment can be obtained.

  Moreover, since the storage member 36 and the case main body 13a can be unitized, the assembly work of the power storage device 100 can be facilitated. In addition, the storage member 36 can also be arrange | positioned along the inner surface of the upper cover 13b.

  A power storage device of Example 3 will be described with reference to FIG. FIG. 7 is a cross-sectional view of the power storage device taken along the YZ plane, and corresponds to FIG. The same components as those in the first embodiment are denoted by the same reference numerals. The battery folder 123 has a hole 123a extending in the Z-axis direction. The elastic body 39 is accommodated in the hole 123a. For the elastic body 39, the same material as that of the elastic body 32 of the first embodiment can be used.

  The hole 123a is sealed by the plate material 38. In other words, the opening portion in the Z-axis direction of the hole portion 123a is covered with the plate material 38, thereby preventing the coolant 23 from flowing into the hole portion 123a. The plate member 38 and the hole portion 123a constitute the storage portion described in the claims.

  When the amount of gas generated from the assembled battery 12 is small, the plate member 38 is not deformed to the inside of the hole 123a. When the amount of gas generated from the assembled battery 12 is large, the plate material 38 is destroyed and the elastic body 39 contracts. According to the above-described configuration, the same effect as in the first embodiment can be obtained.

  Further, the dead space inside the battery folder 123 can be effectively utilized. Furthermore, since the storage unit and the battery folder 123 can be unitized, the assembly work of the power storage device can be facilitated.

It is sectional drawing when an electrical storage apparatus is cut | disconnected by the YZ surface. It is sectional drawing when a cylindrical battery is cut | disconnected by the YZ surface. It is sectional drawing when an electrical storage apparatus is cut | disconnected by the YZ plane (The case where the amount of gas emission is small is illustrated). It is sectional drawing when an electrical storage apparatus is cut | disconnected by the YZ plane (The case where there is much gas emission amount is illustrated). It is sectional drawing when the electrical storage apparatus of a comparative example is cut | disconnected by the YZ surface. It is sectional drawing of a capsule. It is sectional drawing when the electrical storage apparatus of Example 2 is cut | disconnected by the YZ surface. It is sectional drawing when the electrical storage apparatus of Example 3 is cut | disconnected by the YZ surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 100 200 Power storage device 2 Floor panel 12 Battery assembly 122 Cylindrical battery 123 Battery folder 31 Capsule 32 37 39 Elastic body 41 Pressure sensor 43 Controller

Claims (12)

A power storage unit;
A storage container for storing the power storage unit;
A liquid heat exchange medium that fills the inside of the container and performs heat exchange with the power storage unit;
A detection element for obtaining information on the internal pressure value of the container;
A storage unit provided inside the storage container and having a space isolated from the heat exchange medium;
In the gas generation state in which gas is generated from the power storage unit, the storage unit allows the internal pressure of the storage container to increase until the internal pressure value of the storage container reaches at least the detection pressure value of the detection element, and the internal pressure value is When it rises to a predetermined pressure value that exceeds the detected pressure value, it is destroyed,
The power storage device according to claim 1, wherein a compression body that is compressed by an internal pressure of the storage container when the storage unit is destroyed is stored in the space of the storage unit.   The power storage device according to claim 1, wherein the storage unit has a capsule shape.   The power storage device according to claim 1, wherein the storage unit is formed along an inner surface of the storage container. The power storage unit has a support member that supports the power storage element,
The power storage device according to claim 1, wherein the storage unit is formed in the support member. The power storage unit is connected to a controller,
5. The power storage device according to claim 1, wherein the controller cuts off a current of the power storage unit when the internal pressure value of the storage container reaches the detected pressure value. 6. A discharge pipe for discharging the gas generated from the power storage unit to the outside is connected to the storage container,
The exhaust pipe is provided with a valve that allows gas to be discharged from the exhaust pipe when the operating pressure value is reached, and the operating pressure value is higher than the detected pressure value. 5. The power storage device according to 5.   The space of the storage unit further stores at least one of a neutralizing agent, a coolant, and a flame retardant that neutralizes the electrolyte flowing out from the power storage unit. The power storage device according to any one of the above.   The power storage device according to claim 1, wherein the power storage unit is a power storage module in which a plurality of power storage elements are connected.   The power storage device according to claim 1, wherein the storage unit does not contract until the internal pressure value of the storage container reaches the detected pressure value.   The power storage device according to claim 1, wherein the storage unit has an outer wall made of glass.   The power storage device according to claim 1, wherein the compression body stored in the space of the storage unit is air. A vehicle equipped with the power storage device according to any one of claims 1 to 11.

Images