JP7103192B2 - Battery pack - Google Patents

Description

The present disclosure relates to battery packs.

For example, Japanese Patent Application Laid-Open No. 2009-99322 (hereinafter referred to as "Patent Document 1") discloses a battery pack including a plurality of lithium ion secondary batteries, a plurality of fire extinguishing agent containers, and a battery pack container. Has been done. The digestive agent container has a container formed in an annular shape that surrounds the lithium ion secondary battery, and a digestive agent enclosed in the container. The digestive agent consists of a mixture of ammonium dihydrogen phosphate, ammonium sulfate and silicon dioxide. The battery pack container contains a plurality of lithium ion secondary batteries and a plurality of digestive agent containers.

JP-A-2009-99322

In the battery pack described in Patent Document 1, ignition from one lithium ion secondary battery can be extinguished by a digestive agent, but so-called chain smoke (due to a temperature rise due to ignition of one secondary battery). It is not possible to prevent the generation of smoke from other secondary batteries).

An object of the present disclosure is to provide a battery pack capable of suppressing the generation of chain smoke.

A battery pack according to the present disclosure includes a plurality of secondary batteries, a housing for accommodating the plurality of secondary batteries in a sealed state, and an oxygen scavenger arranged in the housing.

Since the oxygen scavenger is arranged in the housing of this battery pack, the inside of the housing is maintained in a low oxygen state. Therefore, the ignition of the secondary battery in the housing and the resulting temperature rise are suppressed, so that the generation of chain smoke is suppressed.

Further, each secondary battery of the plurality of secondary batteries may have a battery container for accommodating a positive electrode, a negative electrode, a separator and an electrolytic solution, and a safety valve provided in the battery container. In this case, the oxygen scavenger is preferably disposed in at least a part of the area surrounding the safety valve.

In this way, the oxygen concentration in the region particularly in the vicinity of the safety valve in the housing is effectively reduced. Therefore, the combustion of the flammable gas discharged from the battery container through the safety valve is more reliably suppressed.

As described above, according to the present disclosure, it is possible to provide a battery pack capable of suppressing the generation of chain smoke generation.

It is a front view which shows schematic structure of the battery pack of one Embodiment of this disclosure. It is a top view of the battery pack shown in FIG.

The embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same number.

FIG. 1 is a front view schematically showing a configuration of a battery pack according to an embodiment of the present disclosure. FIG. 2 is a plan view of the battery pack shown in FIG. The battery pack 1 of the present embodiment is mounted in, for example, the interior of a vehicle. As shown in FIGS. 1 and 2, the battery pack 1 includes a plurality of secondary batteries 10, a housing 20, and an oxygen scavenger 30.

Each secondary battery 10 has a battery container 11, a positive electrode terminal 16, a negative electrode terminal 17, and a safety valve 18.

The battery container 11 contains a positive electrode (not shown), a negative electrode (not shown), a separator (not shown), an electrolytic solution (not shown), and the like. The battery container 11 is made of aluminum, an aluminum alloy, or the like. The battery container 11 has a case 12 and a lid 13.

The case 12 accommodates a positive electrode, a negative electrode, a separator, an electrolytic solution, and the like, and has a shape that opens in one direction. Specifically, the case 12 is formed in a bottomed square cylinder shape. The lid 13 closes the opening of the case 12.

The positive electrode terminal 16 and the negative electrode terminal 17 are provided on the lid 13 at positions separated from each other.

The safety valve 18 is provided at a portion of the lid 13 between the positive electrode terminal 16 and the negative electrode terminal 17. The safety valve 18 allows the gas inside the battery container 11 to be discharged to the outside of the battery container 11 when the internal pressure of the battery container 11 exceeds the reference value.

The housing 20 houses a plurality of secondary batteries 10 in a sealed state. In the housing 20, the plurality of secondary batteries 10 are orthogonal to both the direction in which the positive electrode terminal 16 and the negative electrode terminal 17 are lined up (the direction orthogonal to the paper surface in FIG. 1) and the height direction of each secondary battery 10. They are arranged so as to be spaced apart from each other along the direction. The housing 20 has a housing body 21 and a top plate 22.

The housing body 21 accommodates a plurality of secondary batteries 10 and has a shape that opens in one direction. Specifically, the housing body 21 is formed in a bottomed square cylinder shape. The top plate 22 closes the opening of the housing body 21.

A check valve 28 is provided on the top plate 22. The check valve 28 prohibits the inflow of gas from the outside of the housing 20 into the housing 20, and when the internal pressure of the housing 20 exceeds a specified value, the gas inside the housing 20 is outside the housing 20. Allow discharge to. That is, when the internal pressure of the housing 20 is less than the specified value (steady state), the housing 20 is sealed. In FIG. 2, the check valve 28 is omitted.

The oxygen scavenger 30 is arranged in the housing 20. The oxygen scavenger 30 is made of iron powder or the like that adsorbs oxygen in the housing 20. As a result, the inside of the housing 20 is in a low oxygen state. In this embodiment, a plurality of oxygen scavengers 30 are arranged in the housing 20.

The oxygen scavenger 30 is arranged on the lid 13 of the battery container 11 (empty space in the housing 20). The oxygen scavenger 30 is arranged on each lid 13 so as to straddle a pair of lids 13 adjacent to each other. The oxygen scavenger 30 is arranged in at least a part of the area surrounding the safety valve 18 (near the safety valve 18). Specifically, as shown in FIG. 2, one oxygen scavenger 30 is arranged on the lid 13 between the positive electrode terminal 16 and the safety valve 18, and the other oxygen scavenger 30 is arranged. It is arranged on the lid 13 at a portion between the negative electrode terminal 17 and the safety valve 18. In other words, each oxygen scavenger 30 is arranged at a position sandwiching a straight line connecting the safety valves 18.

As shown in FIG. 1, the height of the oxygen scavenger 30 is set to be substantially equal to the height of the positive electrode terminal 16 and the height of the negative electrode terminal 17.

Next, a case where the primary secondary battery 10 is thermally runaway will be described.

When the first secondary battery 10 is thermally runaway, flammable high-temperature gas is discharged from the inside of the battery container 11 through the safety valve 18.

Here, in the present embodiment, since the inside of the housing 20 is maintained in a low oxygen state by arranging the oxygen scavenger 30 in the housing 20, the combustible discharged from the primary secondary battery 10 The sex gas is discharged to the outside of the housing 20 through the check valve 28 with almost no combustion in the housing 20.

Therefore, the temperature rise of the secondary battery 10 adjacent to the primary secondary battery 10 and the generation of smoke (chain smoke) due to the temperature rise are suppressed.

The above effect is effectively exhibited even when the flammable substance contained in the gas discharged from the secondary battery 10 increases due to the increase in the capacity of the secondary battery 10.

On the other hand, if the primary secondary battery 10 thermally runs away when the oxygen scavenger 30 is not provided in the housing 20, the high-temperature gas discharged from the primary secondary battery 10 is discharged into the housing 20. It burns by reacting with oxygen. As a result, the temperature of the secondary battery 10 adjacent to the one secondary battery 10 rises, so that smoke (chain smoke) is generated from the adjacent secondary battery 10.

Further, in the above embodiment, since the oxygen scavenger 30 is arranged on the lid 13 of the battery container 11 (empty space in the housing 20), the size of the housing 20 can be avoided.

Further, since the oxygen scavenger 30 is arranged on the lid 13 between the positive electrode terminal 16 and the safety valve 18, and on the lid 13 between the negative electrode terminal 17 and the safety valve 18, the oxygen scavenger 30 is arranged. The oxygen concentration in the region of the housing 20 in the vicinity of the safety valve 18 is effectively reduced. Therefore, the combustion of the flammable gas discharged from the battery container 11 through the safety valve 18 is more reliably suppressed.

It should be noted that the embodiments disclosed this time are examples in all respects and should not be considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

For example, a communication flow path (not shown) that communicates each safety valve 18 with the outside of the housing 20 may be provided inside the housing 20. The communication flow path is preferably provided in the space between the positive electrode terminal 16 and the negative electrode terminal 17 on the lid 13.

1 Battery pack, 10 Rechargeable battery, 11 Battery container, 12 case, 13 lid, 16 positive electrode terminal, 17 negative electrode terminal, 18 safety valve, 20 housing, 21 housing body, 22 top plate, 28 check valve, 30 removal Oxygen agent.

Claims (1)

With multiple rechargeable batteries
A housing that houses the plurality of secondary batteries in a sealed state,
A plurality of oxygen scavengers arranged in the housing and
Each of the plurality of secondary batteries
Battery container and
The positive electrode terminal provided on the upper surface of the battery container and
Of the upper surface of the battery container, a negative electrode terminal provided at a position separated from the positive electrode terminal in a direction orthogonal to both the arrangement direction of the plurality of secondary batteries and the height direction of the secondary battery.
It is arranged between the positive electrode terminal and the negative electrode terminal on the upper surface of the battery container, and when the internal pressure of the battery container becomes equal to or higher than a reference value, the gas in the battery container is discharged to the outside of the battery container. Has a safety valve that allows discharge,
The plurality of oxygen scavengers are arranged on the upper surface of the battery container between the positive electrode terminal and the safety valve, and on the upper surface of the battery container between the negative electrode terminal and the safety valve. The battery pack is .

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