JP2014235825A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique to suppress an increase in the manufacturing cost of a power storage module.SOLUTION: A power storage module comprises a plurality of power storage cells electrically connected to one another. Each of the plurality of power storage cells includes: an electrode assembly having a positive electrode and a negative electrode; and a case housing the electrode assembly. The power storage module further comprises: a communication path for connecting internal spaces in the cases of the power storage cells to one another; and current cutoff devices for cutting off a current flowing through the power storage module if pressure inside a space, which is formed by connecting the cases of the power storage cells to one another, increases. The number of the current cutoff devices provided in the power storage module is less than that of the power storage cells provided in the power storage module.

Description

  The technology disclosed in this specification relates to a power storage module having a plurality of power storage cells.

  When an abnormality such as overcharging occurs in the power storage device, gas may be generated from the electrolytic solution in which the electrode is immersed, and the pressure in the case housing the electrode may increase. The power storage device of Patent Document 1 includes a pressure-sensitive current interrupting device that interrupts the current of the power storage device when the pressure in the case (can) increases.

Patent No. 4644483

  In order to obtain a high-output and high-capacity power storage device, a power storage module in which a plurality of power storage cells are electrically connected to each other may be formed. In such a power storage module, each power storage cell has a case. For this reason, when this electrical storage module is equipped with a pressure-sensitive current interrupt device, it is necessary to provide a current interrupt device for each case. That is, it is necessary to provide the same number of current interrupting devices as the number of storage cells. For this reason, the manufacturing cost of an electrical storage module increases.

  The present specification provides a technique for solving the above-described problems. The present specification provides a technique for suppressing an increase in manufacturing cost of a power storage module.

  The power storage module disclosed in this specification is a power storage module including a plurality of power storage cells that are electrically connected to each other. Each of the plurality of power storage cells includes an electrode assembly having a positive electrode and a negative electrode, and a case containing the electrode assembly. The power storage module further includes a communication path that connects the internal spaces of the plurality of storage cell cases to each other, and a space that is formed by connecting the cases of each storage cell to each other (that is, the internal space of the communication paths, and And a current interrupting device that interrupts the current flowing through the energy storage module when the pressure in the space of the energy storage cells is increased. The number of current interrupt devices included in the power storage module is smaller than the number of power storage cells included in the power storage module.

  In the above power storage module, the internal spaces of the plurality of power storage cell cases communicate with each other. The current interrupt device receives the pressure of the space formed by the internal spaces of the case communicating with each other. For example, when gas is generated in one of the power storage cells of the power storage module due to overcharge or the like, the pressure in the space formed by the internal spaces of the case communicating with each other increases, and the current interrupting device generates a current flowing through the power storage module. Cut off. For this reason, in said electrical storage module, it is not necessary to provide the current interruption device in each electrical storage cell, and is provided with only the current interruption device of a number smaller than the number of electrical storage cells. In the above power storage module, the number of current interrupting devices can be reduced as compared with the case where each power storage cell includes a current interrupting device. Thereby, the increase in the manufacturing cost of an electrical storage module can be suppressed.

  According to the power storage device disclosed in the present specification, an increase in manufacturing cost of the power storage module can be suppressed.

FIG. 3 is a cross-sectional view illustrating a power storage module 302 according to the first embodiment. 6 is a cross-sectional view showing a power storage module 304 of Example 2. FIG. FIG. 6 is a cross-sectional view showing a power storage module 306 of Example 3. FIG. 6 is a cross-sectional view showing a power storage module 402 of Example 4. FIG. 10 is a cross-sectional view showing a power storage module 404 of another form of Example 4. 3 is a partial enlarged cross-sectional view showing a gas-liquid separation unit 120. FIG.

  Hereinafter, some technical features of the embodiments disclosed in this specification will be described. The items described below have technical usefulness independently.

(Characteristic 1) In the power storage module disclosed in this specification, each of the plurality of power storage cells includes a positive terminal and a negative terminal provided in a case of the power storage cell, and a positive electrode and a positive terminal of the power storage cell. You may have the 1st electricity supply path | route which has connected, and the 2nd electricity supply path | route which has connected between the negative electrode and negative electrode terminal of the electrical storage cell. Each power storage cell may be connected in series by connecting the positive electrode terminal of the power storage cell and the negative electrode terminal of another power storage cell. The current interruption device may be provided in the first energization path or the second energization path of any of the storage cells.

  In the above power storage module, a current interrupt device is provided in the first energization path or the second energization path of any of the power storage cells. Moreover, each electrical storage cell is mutually connected in series. For this reason, when the current interrupting device is activated and the current of the energy storage cell provided with the current interrupting device is interrupted, the currents of the other energy storage cells connected in series are also interrupted. In addition, since the current interrupting device is provided in the first energization path or the second energization path of any of the energy storage cells, and the energy storage cells are connected in series, when connecting the energy storage cells to each other, What is necessary is just to connect the positive electrode terminal of one electrical storage cell, and the negative electrode terminal of another electrical storage cell. That is, when connecting each power storage cell to each other, it is not necessary to newly connect a current interrupting device provided in a certain power storage cell and another power storage cell with a wiring or the like. For this reason, the assembly work of an electrical storage module can be reduced. Thereby, the increase in the manufacturing cost of an electrical storage module can further be suppressed.

(Characteristic 2) The power storage module disclosed in the present specification may include a buffer chamber communicating with the internal space of the case of each power storage cell.

  The power storage cell of the power storage module may generate a small amount of gas even when normal charge / discharge is performed. In the above power storage module, when a small amount of gas is generated in any one of the power storage cells during normal charge / discharge of the power storage module, the gas flows into the buffer chamber. Thereby, it is suppressed that the pressure of a case raises by normal charging / discharging of an electrical storage module. Thereby, said electrical storage module can suppress that a current interrupting device malfunctions by normal charging / discharging of an electrical storage module. Moreover, since it is not necessary to provide a buffer chamber for every electrical storage cell, the increase in the manufacturing cost of an electrical storage module can be suppressed.

(Characteristic 3) The power storage module disclosed in the present specification allows gas to pass between the inner side and the outer side of a space formed by the cases of the respective power storage cells communicating with each other while restricting the gas flow rate. A gas passage part may be provided.

  In the power storage module described above, when a small amount of gas is generated in any one of the power storage cells during normal charge / discharge of the power storage module, the gas can be released from the gas passage portion. For this reason, it can suppress that the pressure of a case raises by normal charging / discharging of an electrical storage module. Thereby, it can suppress that a current interrupting device malfunctions. On the other hand, the flow rate of gas passing through the gas passage is limited. For this reason, when a large amount of gas is generated during an abnormality such as overcharge, the pressure in the case increases due to the gas remaining in the case without passing through the gas passage portion. For this reason, the current interrupting device can be operated in the event of an abnormality. Moreover, since it is not necessary to provide a gas passage part for every electrical storage cell, the increase in the manufacturing cost of an electrical storage module can be suppressed.

  The power storage module 302 of the first embodiment includes a plurality of power storage cells 2 a to 2 d and a pipe 60. The power storage cells 2a to 2d are secondary batteries such as nickel metal hydride batteries and lithium ion batteries. The power storage module 302 is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, and supplies power to the motor. In addition, the power storage module 302 is charged with electric power regenerated by the motor. The storage cells 2a to 2d are connected in series to each other (described in detail later). The positive electrode terminal 12a of the electricity storage cell 2a located at one end connected in series and the negative electrode terminal 13d of the electricity storage cell 2d located at the other end are connected to an external load or the like via wiring or the like, and the electricity storage module 302 Used for charging and discharging.

  Below, the electrical storage cell 2b is demonstrated in detail. The other power storage cells 2a, 2c, and 2d are substantially the same as the configuration of the power storage cell 2b, and a description thereof will be omitted. In addition, the code | symbol of each structure of the other electrical storage cell 2a, 2c, 2d has changed the tail b of the code | symbol of the structure of the electrical storage cell 2b into a, c, d, respectively. In addition, the storage cell 2b and the storage cells 2a, 2c, and 2d are provided with a current interrupting device 40 described later, while the other storage cells 2a, 2c, and 2d include the current interrupting device 40. The difference is not provided.

  The storage cell 2b includes a case 4b, an electrode assembly 6b, a positive terminal 12b, a negative terminal 13b, and a current interrupt device 40. Case 4b is a substantially rectangular parallelepiped container. For example, a metal can be used as a material for forming the case 4b. The electrode assembly 6b is accommodated in the space inside the case 4b. The electrode assembly 6b includes a positive electrode (not shown), a negative electrode (not shown), and a separator (not shown) that separates the positive electrode and the negative electrode. The positive electrode and the negative electrode each have a metal foil and an active material layer formed on the metal foil. The electrode assembly 6b is immersed in a liquid electrolyte. The electrolytic solution contains a supporting salt containing a lithium salt in a solvent. For example, FEC (fluoroethylene carbonate) can be used as the solvent. As the supporting salt, for example, LiPF6 (lithium hexafluorophosphate) can be used. The electrolyte contains an aromatic monomer additive. When an overvoltage is applied to the electrode assembly 6b, the monomer additive contained in the electrolyte is polymerized to generate a relatively large amount of hydrogen gas. Even when the electrode assembly 6b is charged / discharged in a normal state, a trace amount of hydrocarbon gas or carbon dioxide gas is generated.

  A positive electrode terminal 12b is provided at an end of the upper wall of the case 4b on the right side in FIG. Further, a negative electrode terminal 13b is provided at an end of the upper wall of the case 4b on the left side in FIG. The positive electrode and the positive electrode terminal 12b are connected by a first energization path 10b. Similarly, the negative electrode and the negative electrode terminal 13b are connected by the second energization path 11b. An opening 46b is provided in the upper wall of the case 4b. A pipe 60 described later is connected to the opening 46b. The current interrupt device 40 is provided on the second energization path 11b. The current interrupt device 40 is a so-called pressure-sensitive current interrupt device. When the pressure in the case 4b is less than the current cutoff pressure value, the current interrupt device 40 makes the current flow through the second energization path 11b. Moreover, the electric current interruption apparatus 40 interrupts | blocks the 2nd electricity supply path | route 11b, when the pressure in case 4b is more than an electric current interruption pressure value, and makes it the state into which an electric current does not flow. The current interrupt device 40 is designed in advance so as to interrupt the second energization path 11b when the pressure in the case 4b becomes equal to or greater than the current interrupt pressure value. The current cutoff pressure value can be set to a value that is higher than the atmospheric pressure, for example, and lower than the pressure in the case 4b when an abnormal state such as overcharging occurs. For example, the current cutoff pressure value can be a value obtained by adding a certain margin to the atmospheric pressure value.

  The plurality of power storage cells 2a to 2d are electrically connected to each other in series. Specifically, the negative electrode terminal 13a of the energy storage cell 2a and the positive electrode terminal 12b of the energy storage cell 2b, the negative electrode terminal 13b of the energy storage cell 2b, the positive electrode terminal 12c of the energy storage cell 2c, the negative electrode terminal 13c of the energy storage cell 2c and the positive electrode of the energy storage cell 2d. Terminals 12d are connected to each other. In the above description, the current interrupt device 40 is provided in the storage cell 2b. However, the electric current interruption apparatus 40 should just be provided in either of electrical storage cell 2a-2d. Moreover, in said description, the electric current interruption apparatus 40 was provided in the 2nd electricity supply path | route 11b. However, the current interrupt device 40 may be provided in either the first energization path 10a or the second energization path 11b.

  The piping 60 is located above the storage cells 2a to 2d. The pipe 60 includes a main body part 62 and branch parts 63a to 63d. The main body 62 extends in the left-right direction in FIG. The branch parts 63a to 63d extend from the main body part 62 in the downward direction in FIG. The lower ends of the branch portions 63a to 63d are connected to the openings 46a to 46d of the cases 4a to 4d. Thereby, the internal space of each case 4a-4d is mutually connected by the piping 60. FIG.

  When any one of the storage cells 2a to 2d (assumed to be the storage cell 2d) is overcharged, a gas such as hydrogen is generated from the electrolytic solution of the storage cell 2d. As described above, the internal spaces of the cases 4a to 4d of the storage cells 2a to 2d are communicated with each other by the pipe 60. For this reason, when gas is generated in the case 4d of the storage cell 2d that has been overcharged or the like, a space formed by the cases 4a to 4d communicating with each other (specifically, the space inside the pipe 60, In addition, the pressure of the internal space of the cases 4a to 4d of the power storage cells 2a to 2d is increased. As a result, the pressure in the internal space of the case 4b of the storage cell 2b also increases. When the pressure in the internal space of the case 4b becomes equal to or higher than the above-described current interruption pressure value, the current interruption device 40 is activated and the second energization path 11b of the storage cell 2b is interrupted.

  As described above, the storage cells 2a to 2d are connected in series. For this reason, when the 2nd electricity supply path | route 11b of the electrical storage cell 2b is interrupted | blocked and it will be in the state where an electric current does not flow, an electric current will not flow into other electrical storage cells 2a, 2c, and 2d. That is, when the current interrupt device 40 is activated, no current flows through the power storage module 302.

  In the power storage module 302 of the present embodiment, the internal spaces of the cases 4a to 4d of the plurality of power storage cells 2a to 2d are communicated with each other. The current interrupt device 40 receives the pressure of the space formed by the internal spaces of the cases 4a to 4d communicating with each other. Therefore, when gas is generated in any of the power storage cells 2a to 2d due to overcharge or the like, the pressure in the internal space of the case 4b increases, and the current interrupt device 40 blocks the current flowing through the power storage module 302. For this reason, in the electrical storage module 302 of a present Example, it is not necessary to provide the electric current interruption apparatus 40 in each electrical storage cell 2a-2d, The electric current interruption apparatus 40 is provided only in the electrical storage cell 2b. In the power storage module 302 described above, the number of current interrupting devices 40 can be reduced as compared with the case where the current interrupting devices 40 are provided in the respective energy storage cells 2a to 2d. Thereby, the increase in the manufacturing cost of the electrical storage module 302 can be suppressed.

  In the power storage module 302 of the present embodiment, the current interrupt device 40 is provided in the first energization path 10b or the second energization path 11b of the energy storage cell 2b. Moreover, each electrical storage cell 2a-2d is mutually connected in series. For this reason, when the current interrupting device 40 is activated and the current of the energy storage cell 2b provided with the current interrupting device 40 is interrupted, the currents of the other energy storage cells 2a, 2c, and 2d connected in series are also Blocked.

  Moreover, since the electric current interruption apparatus 40 is provided in the 1st electricity supply path | route 10b or the 2nd electricity supply path | route 11b of the electrical storage cell 2b, and each electrical storage cell 2a-2d is connected in series, each electrical storage cell 2a-2d is connected. When connecting to each other, the positive electrode terminal of one power storage cell and the negative electrode terminal of another power storage cell may be connected. In other words, when connecting the power storage cells 2a to 2d to each other, it is necessary to newly connect the current interrupting device 40 provided in the power storage device 2b and the other power storage cells 2a, 2c, and 2d with wiring or the like. There is no. For this reason, the assembly work of the electrical storage module 302 can be reduced, and the increase in the manufacturing cost of the electrical storage module 302 can further be suppressed.

  In the power storage module 302 of the present embodiment, the pipe 60 is positioned above the power storage cells 2a to 2d. For this reason, the electrolyte solution accommodated in the cases 4 a to 4 d of the storage cells 2 a to 2 d is unlikely to flow into the pipe 60. As a result, the electrolytic solution of a certain storage cell is suppressed from moving to another storage cell. Thereby, it is suppressed that excess and deficiency arises in the quantity of the electrolyte solution with which the electrical storage cells 2a-2d are equipped.

  The power storage module 302 of the present embodiment may include a gas-liquid separation unit 120 in the power storage cells 2a to 2d. As shown in FIG. 6, for example, the storage cell 2 a includes a gas-liquid separator 120, and the gas-liquid separator 120 includes a filter 122. The filter 122 is disposed in the case 4a so as to close the opening 46a of the case 4a. A so-called waterproof and moisture-permeable material can be used as a material for forming the filter 122. The filter 122 may be a breathable mesh or the like. The filter 122 is difficult to permeate liquids such as an electrolytic solution, while gas such as hydrocarbons permeates. The gas-liquid separator 120 prevents the electrolyte contained in the case 4a from flowing out of the case 4a through the opening 46a.

  Since each power storage cell 2a to 2d of the power storage module 302 includes the gas-liquid separator 120, the electrolyte is prevented from flowing out of the cases 4a to 4d through the pipe 60. As a result, the amount of the electrolytic solution in each case 4a to 4d is prevented from becoming uneven. On the other hand, gas generated during normal use of the power storage module 302 or an abnormality such as overcharging can pass through the gas-liquid separator 120. For this reason, when any one of the energy storage cells of the energy storage module 302 is overcharged, the pressure in the cases 4a to 4d of the energy storage cells 2a to 2d communicating with each other increases, and the energy storage cells 2a to 2d The current interrupting device 40 arranged in any of the above can be operated.

  The pipe 60 may be formed of an insulator. Thereby, for example, when the cases 4a to 4d of the respective storage cells 2a to 2d are made of metal and the cases 4a to 4d also serve as either positive or negative electrode terminals, a current is supplied to the pipe 60. It is prevented from flowing.

  As illustrated in FIG. 2, the power storage module 304 according to the second embodiment includes a buffer chamber 70. The buffer chamber 70 is a substantially rectangular parallelepiped container. As a material for forming the buffer chamber 70, for example, a metal can be used. The buffer chamber 70 is connected to the pipe 60. That is, the internal spaces of the cases 4 a to 4 d of the respective storage cells 2 a to 2 d and the buffer chamber 70 are communicated with each other by the pipe 60.

  The power storage cells 2a to 2d of the power storage module 304 may generate a small amount of gas even when normal charge / discharge is performed. As a result, the pressure in the cases 4a to 4d may increase and the current interrupting device 40 may malfunction even though no abnormality such as overcharging has occurred.

  In the power storage module 304 of the present embodiment, when gas is generated in any of the power storage cells 2 a to 2 d, the gas flows into the buffer chamber 70. As a result, an increase in the pressure in the cases 4a to 4d is suppressed. For this reason, it is suppressed that the electric current interruption apparatus 40 act | operates although abnormality, such as an overcharge, has not generate | occur | produced. That is, the malfunction of the current interrupt device 40 is suppressed. Moreover, since it is not necessary to provide the buffer chamber 70 for every electrical storage cell 2a-2d, the increase in the manufacturing cost of the electrical storage module 304 can be suppressed.

  On the other hand, when an abnormality such as overcharge occurs, the amount of gas generated is large. For this reason, when the buffer chamber 70 is filled with gas, the pressure in the buffer chamber 70 increases. For this reason, the power storage module 306 of the present embodiment has a space (specifically, the internal space of the buffer chamber 70, the pipe 60, etc.) formed by the cases 4a to 4d communicating with each other in the event of an abnormality. The pressure of the internal space and the space of the storage cells 2a to 2d combined with the internal spaces of the cases 4a to 4d can be increased. For this reason, the electric current interruption apparatus 40 can be operated at the time of abnormality.

  As shown in FIG. 3, the power storage module 306 of the third embodiment is provided with a gas passage part 82. The gas passage portion 82 is provided at the upper end portion of the pipe 60 (specifically, the center in the left-right direction of the upper wall of the main body portion 62). A pedestal 66 is provided in the pipe 60 at a position where the gas passage 82 is provided. An opening 67 is formed in the pedestal 66. The gas passage part 82 has a resin filter 80. The resin filter 80 is a disk-shaped filter formed of a resin having gas permeability, and closes the opening 67. As the resin having gas permeability, for example, a disubstituted acetylene polymer or polyimide can be used. These materials do not transmit liquids such as electrolyzed liquid and water, but transmit gases such as hydrocarbon gas, carbon dioxide gas, and hydrogen gas.

  In each of the energy storage cells 2a to 2d of the energy storage module 306, the amount of gas generated during normal charging / discharging (the amount of gas generated per unit time) is small. On the other hand, the amount of gas generated at the time of abnormality is large. In the following description, the amount of gas generated from each of the storage cells 2 a to 2 d of the storage module 306 may be simply referred to as the amount of gas generated by the storage module 306. In the electricity storage module 306 of this embodiment, the gas permeation amount per unit time of the resin filter (hereinafter, simply referred to as gas permeation amount per unit time) is the normal charge / discharge of the electricity storage module 306. It is set to be larger than the gas generation amount and smaller than the gas generation amount at the time of abnormality. Specifically, the material, thickness, and area in contact with the gas of the resin filter are appropriately selected according to the specifications of the power storage module 306. Further, the gas permeation amount per unit time of the resin filter is set to be smaller than the gas generation amount at the time of abnormality and not more than a value at which the current interrupting device 40 operates within a predetermined target time at the time of abnormality.

  In the power storage module 306, the amount of gas generated per unit time during normal charging / discharging is smaller than the amount of gas permeation per unit time of the resin filter 80. For this reason, the power storage module 306 can flow most of the generated gas amount to the outside through the gas passage portion 82. Therefore, it is suppressed that the pressure of cases 4a-4d rises by normal charging / discharging. Thereby, the electrical storage module 306 of a present Example can suppress that the electric current interruption apparatus 40 malfunctions. On the other hand, the amount of gas generated per unit time at the time of abnormality is larger than the amount of gas permeation of the resin filter 80 per unit time. For this reason, the generated gas accumulates in the cases 4a to 4d, and the pressure in the space formed by connecting the cases 4a to 4d can be increased. For this reason, the electric current interruption apparatus 40 can be operated at the time of abnormality.

  In the above embodiment, the opening 67 is closed by the resin filter 80. However, the opening 67 may be closed by a filter formed of another material. As a material for forming the filter, for example, a material (for example, a porous material or a mesh) that can block the opening 67 while having air permeability can be used. Further, the gas passage part 82 may be other means that allows gas to pass while limiting the flow rate of the gas. Instead of providing the resin filter 80 or the like in the opening 67, the gas permeation amount per unit time may be adjusted by reducing the opening area of the opening 67 (that is, by using a so-called pinhole). By reducing the opening area, the resistance when the gas passes through the opening 67 is increased, and the gas flow rate is limited. Further, a movable valve body may be provided in the opening 67, and the gas permeation amount per unit time may be adjusted by adjusting the opening area when the valve body is in an open state.

  In the power storage module 306 of the third embodiment, the buffer chamber 70 described in the second embodiment may be further provided.

  In the power storage module 302 of the first embodiment, the current interrupt device 40 is provided in the internal space of the case 4b of the power storage cell 2b. On the other hand, in the power storage module 402 of the fourth embodiment, the current interrupt device 40 is provided in the internal space of the buffer chamber 70 (see FIG. 4). In the power storage module 402 of the fourth embodiment, the power storage cells 2a to 2d are connected in parallel to each other. Specifically, the total positive terminal 92 and the positive terminals 12a to 12d of the storage cells 2a to 2d are connected by the wiring 94. The wiring 94 has a single wiring on the side close to the total positive terminal 92, and the side close to each of the storage cells 2a to 2d corresponds to the number (specifically, four) of the storage cells 2a to 2d (4). Branch). The total negative electrode terminal 93 and the negative electrode terminals 13a to 13d of the storage cells 2a to 2d are connected by a wiring 95. The current interrupting device 40 is provided at a position near the total positive terminal 92 of the wiring 94 (that is, a position where the wiring 94 is a single wiring).

  As described above, when gas is generated in any of the cases 4a to 4d of the storage cells 2a to 2d at the time of abnormality such as overcharge, the pressure in the internal space of the buffer chamber 70 increases. As a result, the current interrupt device 40 is activated and the current of the power storage module 402 is interrupted. In the power storage module 402 of the fourth embodiment, since the current interrupt device 40 is provided in the internal space of the buffer chamber 70, the possibility that the current interrupt device 40 contacts the electrolyte can be reduced.

  Moreover, as shown in FIG. 5, each electrical storage cell 2a-2d may be mutually connected in series. The power storage cells 2 a to 2 d of the power storage module 404 are connected to each other in series by wirings 16 a to 16 c and wirings 102 and 103. In the power storage module 404 as well, as in the power storage module 402 described above, when the current interrupt device 40 provided in the internal space of the buffer chamber 70 is activated, the current flowing through the power storage module 404 is interrupted.

  The power storage module of the above embodiment may include power storage cells other than the power storage cells 2a to 2d. In other words, the power storage module of the above embodiment may include power storage cells other than the power storage cells 2a to 2d connected by the pipe. In the power storage module of the above embodiment, when any of the power storage cells 2a to 2d is overcharged and the current interrupting device 40 is activated, the currents of the power storage cells other than the power storage cells 2a to 2d are also shut off. It may be configured.

  The correspondence between each of the above embodiments and the claims will be described. The pipe 60 in each of the above embodiments is an example of the “communication path” in the claims.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and has technical utility by achieving one of the objects.

12a to 12d Positive terminal 13a to 13d Negative terminal 16a to 16c Wiring 2a to 2d Storage cell 46a to 46d Opening 4a to 4d Case 6a to 6d Electrode assemblies 10a to 10d First energizing path 11a to 10d Second energizing path 40 Current Blocking device 70 Buffer chamber 82 Gas passage portion 92 Total positive terminal 93 Total negative terminal 302, 304, 306, 402, 404 Power storage module

Claims (4)

A power storage module comprising a plurality of power storage cells electrically connected to each other,
Each of the plurality of power storage cells is
An electrode assembly having a positive electrode and a negative electrode;
A case housing the electrode assembly,
The power storage module further includes:
A communication path communicating with the internal space of the plurality of storage cell cases;
A current interrupting device that interrupts a current flowing through the energy storage module when the pressure of a space formed by the cases of the energy storage cells communicating with each other increases;
The power storage module, wherein the number of current interrupt devices provided in the power storage module is smaller than the number of power storage cells provided in the power storage module. Each of the plurality of power storage cells is
A positive electrode terminal and a negative electrode terminal provided in the case of the storage cell;
A first energization path connecting the positive electrode and the positive electrode terminal of the storage cell;
A second energization path connecting between the negative electrode and the negative electrode terminal of the electricity storage cell,
Each storage cell is connected in series by connecting the positive terminal of the storage cell and the negative terminal of another storage cell,
The power storage module according to claim 1, wherein the current interrupting device is provided in a first energization path or a second energization path of any one of the power storage cells. The power storage module further includes:
The power storage module according to claim 1, further comprising a buffer chamber communicating with an internal space of each power storage cell case. The power storage module further includes:
Any of Claims 1-3 provided with the gas passage part which passes gas, restrict | limiting the flow volume of gas between the inner side and the outer side of the space formed when the case of each said electrical storage cell is mutually connected. The electricity storage module according to claim 1.

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