JP4218267B2 - Battery - Google Patents

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Publication number
JP4218267B2
JP4218267B2 JP2002198172A JP2002198172A JP4218267B2 JP 4218267 B2 JP4218267 B2 JP 4218267B2 JP 2002198172 A JP2002198172 A JP 2002198172A JP 2002198172 A JP2002198172 A JP 2002198172A JP 4218267 B2 JP4218267 B2 JP 4218267B2
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Prior art keywords
battery
battery case
gas
cell
square
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JP2004039582A (en
Inventor
晴義 山下
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トヨタ自動車株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembled battery configured by connecting a plurality of single cells, and more particularly to an assembled battery mounted on a vehicle as a drive source.
[0002]
[Prior art]
A secondary battery is mounted to supply electric power to an electric motor that is a drive source of the electric vehicle. Conventionally, as such secondary batteries, a plurality of collective secondary batteries configured by connecting a plurality of unit cells and integrally connecting them so as to obtain a necessary power capacity are often employed. As such a collective secondary battery, for example, a sealed alkaline secondary battery is used as a single battery. A plurality of unit cells are arranged so that the wide long sides of the cell case of the unit cell are opposed to each other, and the end plates are in contact with the outside of the cell case of the unit cell at both ends. The plates are integrally connected by binding them with a restraining band.
[0003]
A cell contains a plate group, which is a power generating element formed by laminating a positive electrode plate and a negative electrode plate with a separator, together with an electrolytic solution in a battery case, and the opening of each battery case is covered with a lid provided with a safety valve. Close and pull out the lead upward from the upper end of one side of each positive electrode plate constituting the electrode plate group, connect the positive terminal to the upper part, and similarly pull out the lead upward from the upper end of the other side of each negative electrode plate A negative terminal is connected to the upper part of the lever, and the positive terminal and the negative terminal are attached to a lid.
[0004]
In such a collective type secondary battery, a plurality of single cells are completely separated and sealed, so that the internal pressure of some single cells may increase due to capacity variation or temperature variation of each single cell. . For this reason, in order to prevent the battery case of the unit cell from rupturing, a safety valve for releasing the gas generated inside is provided for each unit cell. This state is shown in FIG. As shown in FIG. 9, a collective secondary battery is constituted by the first to sixth cells, and a safety valve 1000 is provided for each cell.
[0005]
With respect to such an assembled secondary battery, it is possible to easily balance the deterioration of each single battery and extend the life of the entire assembled battery. JP 2001-57199 A discloses such a collective secondary battery. The collective secondary battery disclosed in this publication includes a rectangular battery case in which a plurality of battery cases are integrally connected to each other, a lid body that integrally closes the upper surface opening of each battery case, It includes a communication passage that allows a suitable number of adjacent battery cases to communicate with each other, and a lid that includes a single safety valve provided for a plurality of battery cases that are in communication with each other.
[0006]
The collective secondary battery disclosed in this publication is provided with a square battery case configured by integrally connecting a plurality of battery cases to each other, and the upper surface opening of each battery case is integrated with a lid. Closed to. This collective secondary battery is provided with a communication path that connects a suitable number of battery cases adjacent to each other. A single safety valve was provided on the lid for a plurality of battery cases communicated with each other. This state is shown in FIG.
[0007]
As shown in FIG. 10, the collective secondary battery is composed of a first cell (first cell) to a sixth cell (sixth cell), and the cells communicate with each other through a communication path. In addition, a single safety valve 1000 is provided on the lid. Since each cell is mutually connected by the communicating path, the internal pressure of each battery case becomes uniform. Further, the gas generated in the unit cell that has been deteriorated is absorbed by another unit cell, thereby suppressing the deterioration of the unit cell that has deteriorated. As a result, the balance between the individual cells is ensured, and the life of the assembled secondary battery is improved as a whole. In addition, since a single safety valve is provided on the lid for a plurality of battery cases communicated with each other, the number of safety valves installed can be reduced, and the cost can be reduced.
[0008]
[Problems to be solved by the invention]
However, in the collective secondary battery shown in FIG. 9, the safety valve 1000 must be installed for each unit cell, and there is a problem in terms of cost and size. In addition, since the gas is released to the atmosphere by the safety valve for each unit cell, if the safety valve is frequently opened in each unit cell, the gas is frequently released to affect the internal electrolyte.
[0009]
Further, in the collective secondary battery disclosed in the above-mentioned publication, each cell is connected to each other through a communication path, so that even a normal cell is affected by an abnormal cell. This state will be described with reference to FIG. This secondary battery is assumed to be a nickel-hydrogen battery. FIG. 11 shows the positive electrode capacity and the negative electrode capacity of two cells having different hydrogen storage capacities of the negative electrode.
[0010]
In the negative electrode, hydrogen is left in the negative electrode even when the capacity of the positive electrode becomes zero in order to prevent the battery life from decreasing. This is called negative electrode discharge reserve. This is because if the negative electrode is completely discharged to 0, the electrode is damaged and the battery life is shortened. Thus, at least the capacity for the negative electrode discharge reserve remains in the negative electrode. In this state, if a cell with a low hydrogen storage capacity and a cell with a high hydrogen storage capacity are mixed in the assembled secondary battery, hydrogen passes through the communication path from a cell with a low hydrogen storage capacity to a cell with a high hydrogen storage capacity. Moving. As a result, when there is no communication path, the capacity of the negative electrode discharge reserve does not vary between cells, but when there is a communication path, the capacity of the negative electrode discharge reserve varies between cells. . This means that the deterioration of the battery in the cell having a low negative electrode discharge reserve capacity is accelerated.
[0011]
The present invention has been made in order to solve the above-described problem, and provides a low-cost assembled battery that can increase the battery life without increasing the battery size, eliminating the variation between the battery cells. Is to provide.
[0012]
[Means for Solving the Problems]
The assembled battery according to the first invention is composed of a plurality of battery cells. The battery assembly includes a battery case for storing battery cells, a square battery case in which a plurality of battery cases are integrated, a communication path that connects each battery case and the inside of the square battery case, and each battery case. A unit is provided in the communication path, and is connected to the communication path with a first gas flow means for flowing gas from the battery tank having a high internal pressure to the inside of the square battery tank according to a predetermined condition. And a second gas flow means for discharging gas from the inside of the square battery case to the outside of the square battery case according to a predetermined condition.
[0013]
According to the first invention, the plurality of battery cells are housed in the plurality of battery cases, respectively. A square battery case is formed by integrating a plurality of battery cases. Each battery case is provided with a first gas flow means so as to be connected to a communication path through which gas flows inside the rectangular battery case. As this first gas circulation means, for example, there is a safety valve in which a lower operating pressure is set. For square battery case. Second gas circulation means for discharging gas from the inside of the rectangular battery case to the outside (atmosphere) is provided. As the second gas circulation means, for example, there is a safety valve in which a high operating pressure is set. For some reason, the pressure of hydrogen gas rises inside a certain battery cell (assumed to be a nickel-hydrogen battery), and a predetermined condition (for example, a condition that exceeds the operating pressure of a safety valve provided in the battery case) Is satisfied, the first gas circulation means allows a high-pressure gas to circulate from the battery case to the inside of the square battery case via the communication path. Furthermore, when the pressure of hydrogen gas rises inside a certain battery cell and satisfies a predetermined condition (for example, a condition that the operating pressure of a safety valve provided in the square battery case is exceeded), the second gas flow By the means, high-pressure gas is discharged from the inside of the square battery case to the outside (open to the atmosphere) of the square battery case. Thereby, in the assembled battery composed of a plurality of battery cells, when the internal pressure rises due to the generation of hydrogen gas in each battery cell, the first gas circulation means provided for each battery cell is used. Gas is released from the cell to the inside of the square battery case through the communication path. Furthermore, when the pressure inside the square battery case rises due to the generation of hydrogen gas in the battery cell, the second gas circulation means provided in the square battery case is used to move from the inside of the square battery case to the outside (atmosphere). Let the gas escape. In this way, even in an assembled battery in which a plurality of battery cells are housed in a square battery case, each battery cell is not connected to the communication path until the first gas circulation means is operated, so that the gas can be freely released. Since it cannot go back and forth, even if there is a difference in hydrogen storage capacity between the negative electrodes, there is no variation in the hydrogen stored in the negative electrode as a negative electrode discharge reserve. When the internal pressure of the battery cell rises, the first gas circulation means allows the generated gas to escape into the square battery case through the flow path in order to prevent the battery case containing the battery cell from bursting. Gas can be released for each battery cell without adversely affecting other battery cells. When the internal pressure of the battery cell connected to the communication path by the first gas circulation means further increases, the generated gas can be released to the atmosphere by the second gas circulation means in order to prevent the rectangular battery case from bursting. Gas can escape from the rectangular battery case without adversely affecting other battery cells. Since the first gas circulation means provided in each battery case is provided in the communication path, it is possible to avoid an increase in the size of the assembled battery. As a result, it is possible to provide an assembled battery that can increase the battery life without increasing the battery size, eliminating variations between cells.
[0014]
In the assembled battery according to the second invention, in addition to the configuration of the first invention, when the first gas circulation means reaches a predetermined first pressure, the battery cell having a high internal pressure is changed from a battery cell with a high internal pressure. Means for flowing gas into the interior. The second gas flow means includes means for discharging gas from the inside of the square battery case to the outside of the square battery case when a predetermined second pressure is reached.
[0015]
According to the second invention, gas is released from the battery cell to the inside of the rectangular battery case using a safety valve having a function of operating when a predetermined first pressure is reached. Then, the gas can be released to the outside of the rectangular battery case using a safety valve or the like that has a function to be activated.
[0016]
In the assembled battery according to the third invention, in addition to the configuration of the first or second invention, when the first gas circulation means reaches a predetermined first pressure, the square battery is supplied from the battery case having a high internal pressure. It is a safety valve that allows gas to flow inside the tank. The second gas circulation means is a safety valve that discharges gas from the inside of the rectangular battery case to the outside of the square battery case when a predetermined second pressure is reached.
[0017]
According to the third invention, the safety valve that operates when the predetermined first pressure is reached is used to release gas from the battery cell to the inside of the square battery case, and the safety valve that operates when the predetermined second pressure is reached. Can be used to let gas escape to the outside of the square battery case. In this way, the safety valve as the first gas distribution means necessary for each battery cell is inexpensive and small because the operating pressure is low, so that there is no variation between the cells without increasing the battery size. It is possible to provide a low-cost assembled battery that can extend the life.
[0018]
In the assembled battery according to the fourth invention, in addition to the configuration of the first or second invention, the first gas circulation means is a thin film provided on a partition wall partitioning each battery case, and is predetermined. When the first pressure is reached, the thin film is broken, and gas flows from the battery case having a high internal pressure to the inside of the square battery case. The second gas circulation means is a safety valve that discharges gas from the inside of the rectangular battery case to the outside of the square battery case when a predetermined second pressure is reached.
[0019]
According to the fourth invention, the first gas flow means is not a safety valve, and further uses a small and low-priced thin film to eliminate variations among cells and extend the battery life. A battery can be provided.
[0020]
In the assembled battery according to the fifth invention, in addition to the configuration of the first or second invention, the first gas circulation means is a seal member provided in a partition wall partitioning each battery case, and is predetermined. When the first pressure is reached, the O-ring moves, and gas is circulated from the battery case having a high internal pressure to the inside of the square battery case. The second gas circulation means is a safety valve that discharges gas from the inside of the rectangular battery case to the outside of the square battery case when a predetermined second pressure is reached.
[0021]
According to the fifth aspect of the invention, the first gas flow means is not a safety valve but a seal member that has been conventionally provided in a partition wall that covers a battery cell. For this reason, the first gas distribution means can be realized at a smaller size and at a lower price.
[0022]
The assembled battery according to the sixth invention has a second pressure higher than the first pressure in addition to the configuration of any one of the second to fifth inventions.
[0023]
According to the sixth aspect of the invention, the second pressure at which the second gas flow means operates is higher than the first pressure at which the first gas flow means operates. Therefore, when the internal pressure rises, first, the first pressure is reached, the gas escapes from the battery cell to the inside of the integral square battery case, the internal pressure rises further, reaches the second pressure, and the integral corner Gas does not escape from the inside of the mold battery case to the outside, and each battery case and the integral square battery case are not damaged. Further, other normal cells are not affected by the abnormal cells.
[0024]
In the assembled battery according to the seventh invention, in addition to the structure of any one of the first to sixth inventions, the battery is a nickel-hydrogen battery.
[0025]
According to the seventh aspect of the present invention, it is possible to suppress the variation in the stored hydrogen for the discharge discharge of the negative electrode, which occurs in the nickel-hydrogen battery, and the battery life can be extended.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated. In the following, as an assembled battery including the battery module according to the embodiment of the present invention, a square battery case in which a plurality of battery cases are integrated (that is, a wall is provided inside the integrated battery case, However, the present invention is not limited to this. An integral prismatic battery case that houses a plurality of battery cases may be used. Furthermore, the shape of the battery case of the present invention is not limited to a square shape. For example, a cylindrical battery case containing cylindrical battery cells may be used.
[0027]
<First Embodiment>
An assembled battery including a battery module according to an embodiment of the present invention will be described. This assembled battery is mounted on, for example, an automobile and supplies electric power to an electric motor that is a driving source of the automobile. This assembled battery includes a plurality of battery modules according to the embodiment of the present invention. FIG. 1 is an exploded perspective view of the assembled battery.
[0028]
As shown in FIG. 1, the assembled battery 100 has a structure in which a module assembly 120 is accommodated in an exterior member including a battery cover 102 and a lower case 122. The module assembly 120 is formed by stacking a plurality of battery modules 130. As the battery module 130, for example, a secondary battery such as a nickel-hydrogen battery can be used. The battery module 130 has a so-called square plate-like outer shape.
[0029]
The battery module 130 includes a plurality of battery cells. Specifically, as illustrated in FIG. 2, the battery module 130 includes an integral square battery case 138 that is a module exterior member, and six battery cells 140 to 140 that are partitioned by a partition wall inside the square battery case 138. 150. A terminal 128 is formed on the end surface of the rectangular battery case 138 in the long axis direction. On the side surface of the square battery case 138, a protrusion 152 is formed for forming a gap as a cooling air flow path between the battery modules 130. In the module assembly 120 (see FIG. 1) in which the battery modules 130 are stacked, a gap is formed between the battery modules 130 when the protrusions 152 of the battery modules 130 come into contact with each other. In FIG. 2, the exhaust terminal 126 (see FIG. 1) is not shown, and a state in which a part of the square battery case 138 is removed is shown for explaining the battery cells 140 to 150.
[0030]
Each of the battery cells 140 to 150 basically has the same structure. The first battery cell 140 will be described as an example. The battery cell 140 sandwiches the laminated electrode body 154 and a laminated electrode body 154 configured by stacking a plurality of sheet-like electrode members in an insulated state with a separator, for example. And a pair of current collector plates 156 arranged as described above. The laminated electrode body 154 is impregnated or injected with an electrolytic solution.
[0031]
In the laminated electrode body 154, the electrode member serving as the positive electrode and the electrode member serving as the negative electrode are alternately overlapped. Moreover, the edge part of the electrode member used as a positive electrode is connected to one current collecting plate 156 collectively. And the edge part of the electrode member used as a negative electrode is connected to the other collector plate (not shown) collectively. As a result, all electrode members serving as positive electrodes and one current collecting plate 156 are electrically connected. Moreover, all the electrode members used as a negative electrode and the other collector plate will be in the electrically connected state. The battery cells 140 to 150 included in the battery module 130 are electrically connected in series. For example, when the rated voltage of each of the battery cells 140 to 150 is 1.2V, the rated voltage of the entire battery module 130 is 7.2V. The configuration of the battery cells 140 to 150 is not limited to the configuration described above, and may be another configuration.
[0032]
As shown in FIG. 1, restraint plates 116 and 118 are disposed at both ends of the module assembly 120. The restraint plates 116 and 118 are connected and fixed to each other by restraint pipes 108 and 110. The restraining plates 116 and 118 are fixed to the lower case 122. Each battery module 130 is also fixed to the lower case 122.
[0033]
On each side surface (end surface) of the battery module 130 constituting the module assembly 120, the terminal 128 for inputting / outputting current to / from the battery module 130 is formed as described above. In order to connect the terminals 128 of the battery module 130 to each other, bus bar modules 112 and 114 are arranged on the side surface of the module assembly 120. The bus bar modules 112 and 114 are connected to the respective terminals 128 of the battery module 130, whereby the battery modules 130 are electrically connected in series in the module assembly 120.
[0034]
On the upper surface of the module assembly 120, an exhaust terminal 126 having a built-in safety valve for exhausting hydrogen gas exhausted from the battery module 130 in a lump is formed. On the exhaust terminal 126, an exhaust hose 104 connected to the exhaust terminal 126 and exhausting hydrogen gas or the like discharged from the battery module 130 to the outside of the assembled battery 100 is installed. A temperature sensor 124 and a harness for measuring the temperature of the module assembly 120 are arranged on the side wall surface of the module assembly 120. In order to maintain the temperature of the module assembly 120 within a predetermined range according to the output of the temperature sensor 124, cooling air is supplied to the module assembly 120 using a blower fan or the like.
[0035]
The internal structure of the battery module 130 will be described with reference to FIG. As shown in FIG. 3, the battery module 130 includes six battery cells 140 to 150, a square battery case 138, with a square battery case 138 containing six battery cells 140 to 150 as an outer frame. And a communication passage 300 therebetween. The square battery case 138 has an exhaust terminal 126, and the collective safety valve 200 is provided in the exhaust terminal 126. The collective safety valve 200 operates when the internal pressure in the square battery case 138 becomes high, and discharges hydrogen gas or the like to the outside of the assembled battery 100 via the exhaust hose 104.
[0036]
Between each battery cell 140-150 and the communicating path 300, the inter-cell safety valves 210-220 are provided. The operating pressure in the inter-cell safety valves 210 to 220 is set lower than the operating pressure of the collective safety valve 200. The inter-cell safety valves 210 to 220 are activated when the internal pressure in each of the battery cells 140 to 150 is increased, and discharge hydrogen gas or the like to the communication unit 300.
[0037]
The operating pressure of the collective safety valve 200 is higher than the operating pressure of the inter-cell safety valves 210 to 220, and the collective safety valve 200 is larger in size and more expensive than the inter-cell safety valves 210 to 220. The inter-cell safety valves 210 to 220 are provided facing the communication path 300 so as to correspond to the battery cells 140 to 150. As described above, since the inter-cell safety valves 210 to 220 are smaller in size than the collective safety valve 200 and are provided in the communication passage 300, the assembly is constituted by the battery module according to the present embodiment. The size of the battery 100 can be made smaller than that of the assembled battery in which a safety valve is provided in each of the battery cells 140 to 150. Furthermore, the assembled battery 100 configured by the battery module according to the present embodiment can be manufactured at a lower cost than the assembled battery in which the safety valve is provided in each of the battery cells 140 to 150.
[0038]
Instead of the configuration shown in FIG. 3, the battery module 130 may be configured as shown in FIG. In this way, one inter-cell safety valve can be reduced. In the following description, the battery module shown in FIG. 3 will be described as an example.
[0039]
The operation of the battery module 130 having such a structure will be described with reference to FIG.
[0040]
In the first cell 140, hydrogen gas is generated for some reason, and the hydrogen gas is generated in the second cell 142 before the collective safety valve 200 operates without stopping the generation. Assume that 200 has been activated.
[0041]
When hydrogen gas begins to be generated in the first cell 140, the internal pressure of the first cell 140 gradually increases. When the operating pressure of the inter-cell safety valve 210 is exceeded, the inter-cell safety valve 210 is operated, and hydrogen gas and the like generated inside the first cell 140 are discharged to the communication path 300. After this, the generation of hydrogen gas in the first cell 140 does not stop, and the internal pressure of the first cell 140 once decreases, but continues to rise again exceeding the operating pressure of the inter-cell safety valve 210.
[0042]
Hydrogen gas begins to be generated in the second cell 142 when the internal pressure is rising in the first cell 140. For this reason, the internal pressure of the second cell 142 gradually increases. When the operating pressure of the inter-cell safety valve 210 is exceeded, the inter-cell safety valve 210 is operated, and hydrogen gas and the like generated inside the second cell 142 are discharged to the communication passage 300. At this time, as shown in FIG. 5, the internal pressure of the first cell 140 already in communication with the communication path 300 is higher than the operating pressure of the inter-cell safety valve 212 of the second cell 142, and the inter-cell safety valve 212. When the is activated, the internal pressure of the second cell 142 (same as the internal pressure of the first cell 140 and the internal pressure of the communication passage 300) rapidly increases. After this, the generation of hydrogen gas in the second cell 142 does not stop, and the internal pressure of the second cell 142 continues to rise beyond the operating pressure of the inter-cell safety valve 210.
[0043]
In this way, the internal pressure in the first cell 140, the second cell 142, and the communication path 300 connected via the communication path 300 continues to rise and exceeds the operating pressure of the collective safety valve 200. Since the collective safety valve 200 is opened to the atmosphere via the exhaust hose 104, when the collective safety valve 200 is operated, the internal pressures in the first cell 140, the second cell 142, and the communication passage 300 are reduced to the atmospheric pressure state at once.
[0044]
As described above, the damage of each battery cell is prevented by using the inter-cell safety valve without affecting the influence of the abnormal cell in which hydrogen gas is generated on other normal cells, and the corner of the battery module is Damage to the mold battery case can be prevented. Further, the inter-cell safety valve is smaller and cheaper than the collective safety valve, and is attached to the communication path in units of battery cells. For this reason, it is possible to provide a low-cost assembled battery that does not increase the size of the assembled battery, does not increase the manufacturing cost, eliminates the variation between cells, and extends the battery life.
[0045]
<Second Embodiment>
Hereinafter, an assembled battery including the battery module according to the second embodiment of the present invention will be described. Note that the assembled battery according to the present embodiment is different from the assembled battery according to the first embodiment described above in the internal structure of the battery module constituting the assembled battery. Other structures are the same as those of the first embodiment. Therefore, detailed description thereof will not be repeated.
[0046]
With reference to FIG. 6, the internal structure of battery module 130 according to the present embodiment will be described. As shown in FIG. 6, this battery module 130 includes six battery cells 140 to 150, a square battery case 138, with a square battery case 138 containing six battery cells 140 to 150 as an outer frame. And a communication passage 300 therebetween. The square battery case 138 is provided with a partition wall 400 that separates the battery cells 140 to 150 from each other. Due to this partition wall, hydrogen gas cannot normally flow between the battery cells 140 to 150. A thin film 410 is provided in the vicinity of the communication path 300 of the partition wall. The thin film 410 is damaged when a predetermined pressure is applied, and hydrogen gas moves from the high pressure side to the low pressure side. The square battery case 138 is provided with a collective safety valve 200. The pressure at which the thin film 410 is damaged is set lower than the operating pressure of the collective safety valve 200.
[0047]
The operation of the battery module 130 having such a structure will be described.
In the second cell 142, hydrogen gas is generated for some reason, and the hydrogen gas is generated in the third cell 144 before the collective safety valve 200 is operated without stopping the generation. Assume that 200 has been activated.
[0048]
When hydrogen gas begins to be generated in the second cell 142, the internal pressure of the second cell 142 gradually increases. When the breakage pressure of the thin film 410 is exceeded, the thin film 410 is broken, and hydrogen gas or the like generated inside the second cell 142 is discharged to the third cell 144 via the communication path 300. Once the thin film 410 is broken, it remains broken. After this, the generation of hydrogen gas in the second cell 142 does not stop, and the internal pressure of the second cell 142 once decreases, but continues to increase again.
[0049]
Hydrogen gas begins to be generated in the third cell 144 when the internal pressure is rising in the second cell 142. At this time, since the thin film provided on the partition wall between the second cell 142 and the third cell 144 is damaged, the hydrogen gas flows between the second cell 142 and the third cell 144. . The internal pressure of the second cell 142 and the third cell 144 gradually increases. When the damage pressure of the thin film 410 provided in the partition between the third cell 144 and the fourth cell 146 exceeds the internal pressure of the second cell 142 and the third cell 144, the thin film 410 is damaged and the second cell 142 and hydrogen gas generated in the third cell are discharged to the fourth cell 146 through the communication path 300. The thin film 410 remains in a damaged state. Thereafter, the generation of hydrogen gas in the second cell 142 and the third cell 144 does not stop, and the internal pressures of the second cell 142, the third cell 144, and the fourth cell 146 once decrease, but continue to increase again.
[0050]
In this way, the internal pressure in the second cell 142, the third cell 144, and the fourth cell 146, which are connected by the damage of the thin film 410, continues to rise and exceeds the operating pressure of the collective safety valve 200. Since the collective safety valve 200 is opened to the atmosphere via the exhaust hose 104, the internal pressure in the second cell 142, the third cell 144, and the fourth cell 146 decreases to the atmospheric pressure state at once.
[0051]
As described above, the failure of each battery cell is prevented by using the thin film provided on the partition wall that partitions the cells without affecting the influence of the abnormal cell in which hydrogen gas is generated on other normal cells, and the collective safety valve Can be used to prevent the rectangular battery case of the battery module from being damaged. Moreover, the thin film provided in the partition is smaller and cheaper than the collective safety valve, and is attached to the communication path in units of battery cells. For this reason, it is possible to provide a low-cost assembled battery that does not increase the size of the assembled battery, does not increase the manufacturing cost, eliminates the variation between cells, and extends the battery life.
[0052]
<Third Embodiment>
Hereinafter, an assembled battery including the battery module according to the third embodiment of the present invention will be described. Note that the assembled battery according to the present embodiment is different from the assembled battery according to the first embodiment described above in the internal structure of the battery module constituting the assembled battery. Other structures are the same as those of the first embodiment. Therefore, detailed description thereof will not be repeated.
[0053]
With reference to FIG. 7, the internal structure of battery module 130 according to the present embodiment will be described. As shown in FIG. 7, the battery module 130 includes six battery cells 140 to 150, a square battery case 138, with a square battery case 138 containing six battery cells 140 to 150 as an outer frame. And a communication passage 300 therebetween. The square battery case 138 is provided with a partition wall 400 that separates the battery cells 140 to 150 from each other. Due to this partition wall, hydrogen gas cannot normally flow between the battery cells 140 to 150. A seal portion 500 is provided in the vicinity of the communication path 300 of the partition wall. When a predetermined pressure is applied to the seal portion 500, the O-ring 520 built in the seal portion 500 moves to create a gas flow path, and hydrogen gas moves from the high pressure side to the low pressure side.
[0054]
As shown in FIG. 8, the normal seal portion 600 is provided with O-rings 520 on both the partition walls 400. The seal portion 500 according to the present embodiment does not have one of these O-rings 520 and is provided with a recess in the partition 400 at that portion. With this configuration, as shown in FIG. 7, when pressure is applied from the high pressure side, the O-ring 520 moves, and a gas flow path is formed in the recess.
[0055]
The square battery case 138 is provided with a collective safety valve 200. The pressure at which the O-ring 520 of the seal unit 500 moves is set lower than the operating pressure of the collective safety valve 200.
[0056]
The operation of the battery module 130 having such a structure will be described.
In the second cell 142, hydrogen gas is generated for some reason, and the hydrogen gas is generated in the third cell 144 before the collective safety valve 200 is operated without stopping the generation. Assume that 200 has been activated.
[0057]
When hydrogen gas begins to be generated in the second cell 142, the internal pressure in the cell gradually increases. When the moving pressure of the O-ring 520 of the seal part 500 is exceeded, the O-ring 520 moves, and hydrogen gas generated inside the second cell 142 flows through the flow path of the seal part 500 and the communication path 300 to the first. It is discharged to 3 cells 144. After this, the generation of hydrogen gas in the second cell 142 does not stop, and the internal pressure of the second cell 142 once decreases, but continues to increase again.
[0058]
Hydrogen gas begins to be generated in the third cell 144 when the internal pressure is rising in the second cell 142. At this time, since the O-ring 520 of the seal portion 500 between the second cell 142 and the third cell 144 is moving, hydrogen gas flows between the second cell 142 and the third cell 144. Yes. The internal pressure of the second cell 142 and the third cell 144 gradually increases. When the moving pressure of the O-ring 520 of the seal portion 500 provided in the partition wall between the third cell 144 and the fourth cell 146 exceeds the internal pressure of the second cell 142 and the third cell 144, the third cell 144 The O-ring 520 of the seal portion 500 between the fourth cell 146 moves and hydrogen gas generated in the second cell 142 and the third cell 144 is discharged to the fourth cell 146 through the communication path 300. Is done.
[0059]
Thereafter, the generation of hydrogen gas in the second cell 142 and the third cell 144 does not stop, and the internal pressures of the second cell 142, the third cell 144, and the fourth cell 146 once decrease, but continue to increase again.
[0060]
In this way, the internal pressure in the second cell 142, the third cell 144, and the fourth cell 146 connected by the movement of the O-ring 520 continues to rise and exceeds the operating pressure of the collective safety valve 200. Since the collective safety valve 200 is opened to the atmosphere via the exhaust hose 104, the internal pressure in the second cell 142, the third cell 144, and the fourth cell 146 decreases to the atmospheric pressure state at once.
[0061]
As described above, the damage of each battery cell is prevented by using the seal portion provided on the partition wall that partitions the cells without affecting the influence of the abnormal cell in which hydrogen gas is generated on other normal cells. Using the safety valve, it is possible to prevent the rectangular battery case of the battery module from being damaged. Moreover, since the sealing part provided in the partition wall is originally necessary, it does not increase the manufacturing cost of the assembled battery. Therefore, it is possible to provide a low-cost assembled battery that does not increase the size of the assembled battery, does not increase the cost, eliminates variations among cells, and extends the battery life.
[0062]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a developed schematic view of an assembled battery according to a first embodiment of the present invention.
FIG. 2 is a schematic perspective view of a battery module constituting the assembled battery of FIG.
FIG. 3 is a schematic diagram (part 1) of the battery module according to the first embodiment of the invention.
FIG. 4 is a schematic diagram (part 2) of the battery module according to the first embodiment of the present invention.
FIG. 5 is a timing chart showing the operation timing of the safety valve in the battery module according to the first embodiment of the invention.
FIG. 6 is a schematic view of a battery module according to a second embodiment of the present invention.
FIG. 7 is a schematic diagram of a battery module according to a third embodiment of the present invention.
FIG. 8 is a view showing a seal part of the assembled battery.
FIG. 9 is a schematic diagram (No. 1) of a battery module used in a conventional assembled battery.
FIG. 10 is a schematic diagram (part 2) of a battery module used in a conventional assembled battery.
11 is a diagram showing a hydrogen movement state in the battery module shown in FIG.
[Explanation of symbols]
100 battery assembly, 102 battery cover, 104 exhaust hose, 108, 110 restraint pipe, 112, 114 bus bar module, 116, 118 restraint plate, 120 module assembly, 122 lower case, 124 temperature sensor, 126 exhaust terminal, 128 terminal, 130 battery module, 138 square battery case, 140-150 battery cell, 152 protrusion, 154 laminated electrode body, 156 current collector plate, 200 collective safety valve, 210-220 inter-cell safety valve, 300 communication path, 400 partition, 410 thin film , 500, 600 Seal part, 520O ring.

Claims (7)

  1. An assembled battery composed of a plurality of battery cells,
    A battery case for storing each of the battery cells;
    A rectangular battery case in which a plurality of the battery cases are integrated;
    A communication path that communicates each of the battery case and the inside of the square battery case;
    A first gas flow that is provided in the communication passage for each of the battery cases, and that allows gas to flow from the battery case having a high internal pressure to the inside of the rectangular battery case in accordance with a predetermined first pressure condition. Means,
    In order to discharge gas from the inside of the square battery case to the outside of the square battery case, provided in the square battery case so as to be connected to the communication path, in accordance with a predetermined second pressure condition And a second gas distribution means.
  2. The first gas flow means includes means for flowing gas from the battery case having a high internal pressure to the inside of the square battery case when a first predetermined pressure is reached,
    The said 2nd gas distribution means contains a means for discharging | emitting gas from the inside of the said square-shaped battery case to the exterior of the said square-shaped battery case, when it becomes predetermined 2nd pressure. The assembled battery described.
  3. The first gas circulation means is a safety valve that circulates gas from a battery tank having a high internal pressure to the inside of the square battery tank when a predetermined first pressure is reached,
    The said 2nd gas distribution means is a safety valve which discharges | emits gas from the inside of the said square-shaped battery case to the exterior of the said square-shaped battery case when it becomes predetermined 2nd pressure. The assembled battery described.
  4. The first gas flow means is a thin film provided on a partition wall that partitions the battery cases, and the thin film is damaged when the first pressure is determined in advance, and the battery case having a high internal pressure is removed from the battery case. Gas flows to the inside of the square battery case,
    The said 2nd gas distribution means is a safety valve which discharges | emits gas from the inside of the said square-shaped battery case to the exterior of the said square-shaped battery case when it becomes predetermined 2nd pressure. The assembled battery described.
  5. The first gas circulation means is a seal member provided in a partition wall that partitions the battery cases. When the first pressure reaches a predetermined first pressure, the O-ring moves to start from a battery case with a high internal pressure. Distribute gas to the inside of the square battery case,
    The said 2nd gas distribution means is a safety valve which discharges | emits gas from the inside of the said square-shaped battery case to the exterior of the said square-shaped battery case when it becomes predetermined 2nd pressure. The assembled battery described.
  6.   The assembled battery according to claim 2, wherein the second pressure is higher than the first pressure.
  7.   The assembled battery according to claim 1, wherein the battery is a nickel-hydrogen battery.
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JP5034156B2 (en) * 2004-07-02 2012-09-26 トヨタ自動車株式会社 Nickel metal hydride storage battery
WO2006013743A1 (en) * 2004-08-05 2006-02-09 Toyota Jidosha Kabushiki Kaisha Battery module, battery pack, and method for producing battery module
JP4595433B2 (en) * 2004-08-05 2010-12-08 トヨタ自動車株式会社 Assembled battery
KR100627397B1 (en) 2005-01-25 2006-09-22 삼성에스디아이 주식회사 Secondary battery module
JP4760061B2 (en) * 2005-03-08 2011-08-31 トヨタ自動車株式会社 Battery module, battery pack, and battery module manufacturing method
JP4721944B2 (en) * 2005-04-13 2011-07-13 パナソニック株式会社 Large power supply
JP4872280B2 (en) * 2005-09-06 2012-02-08 トヨタ自動車株式会社 Battery pack and unit battery
JP5099415B2 (en) * 2007-04-13 2012-12-19 株式会社Gsユアサ Control valve type lead acid battery
CN102473871B (en) 2010-02-24 2015-11-25 松下知识产权经营株式会社 Battery pack
KR20130043154A (en) * 2010-08-06 2013-04-29 파나소닉 주식회사 Cell module
KR101191660B1 (en) * 2010-11-08 2012-10-17 에스비리모티브 주식회사 Battery module
JP5563490B2 (en) * 2011-01-12 2014-07-30 プライムアースEvエナジー株式会社 Battery module
CN103430348A (en) * 2011-03-16 2013-12-04 丰田自动车株式会社 Electrical storage device
JP5620875B2 (en) * 2011-04-22 2014-11-05 プライムアースEvエナジー株式会社 Battery
CN103988272B (en) * 2011-11-22 2017-05-24 日本贵弥功株式会社 Capacitor device
JP2013131734A (en) * 2011-11-22 2013-07-04 Nippon Chemicon Corp Capacitor device
JP5898471B2 (en) * 2011-11-22 2016-04-06 日本ケミコン株式会社 Capacitor device
US8652672B2 (en) * 2012-03-15 2014-02-18 Aquion Energy, Inc. Large format electrochemical energy storage device housing and module
JP5590165B2 (en) * 2013-01-31 2014-09-17 株式会社豊田自動織機 Battery module

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