JP2020077507A - Battery housing body - Google Patents

Abstract

To provide a battery housing body which is in advance of absolutely suppressing flame from being leaked to an external part even in unexpected firing of a battery.SOLUTION: A battery housing body 1 comprises an antiflaming mechanism 3 that suppresses flame from being leaked to an external part if a battery 4 housed in a housing space 2b of a casing 2 fires. The antiflaming mechanism 3 comprises: an exhaust passage 5 that is formed in the outer side of the housing space 2b, and can exhaust an air from the housing space 2b to the outside of the casing 2; a first endotherm part 6 that is arranged in the exhaust passage 5, has a gap allowing the air passing, and can absorb a heat of fire; and a second endotherm part 7 that is arranged in the exhaust passage 5, has the gap allowing the air passing, and can absorb a heat of fire. The exhaust passage 5 includes: an input part 5a which can be communicated into the housing space 2b; and an output part 5b which can be communicated into an external space of the casing 2. In the case where a direction directed to the output part 5b from the input part 5a is a downstream direction, the second endotherm part 7 is existed at a position of the downstream direction from the first endotherm part 6. A space 9 is formed between the first endotherm part 6 and the second endotherm part 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery container.

  Patent Document 1 listed below is a battery pack including a battery and a housing that houses the battery, the housing having a vent hole communicating with the outside of the housing, and a vent hole provided on a side surface of the housing. It is disclosed that a metal mesh member for covering the above is provided. In the battery pack of Patent Document 1, when a situation in which a flame is ejected from the battery occurs, the metal mesh member provided in the ventilation hole absorbs the heat of the flame, so that It is trying to prevent the eruption.

JP, 2009-212081, A

  In the technique of Patent Document 1, a thin mesh member is arranged in the ventilation hole, but when the battery ignites violently and a large amount of gas is ejected from the battery, the flame may pass through the mesh member. Therefore, there is a problem that it is not always possible to prevent the ejection of flame to the outside of the housing.

  The present invention has been made to solve the above-described problems, and provides a battery housing body that is advantageous in reliably suppressing the flame from going out even when the battery ignites. With the goal.

  The battery housing according to the present invention includes a casing having a storage space surrounded by an inner wall surface, and a flameproof mechanism that suppresses a flame from going out when a battery stored in the storage space ignites, The flameproof mechanism is formed outside the storage space, has a discharge flow path capable of discharging gas from the storage space to the outside of the casing, and has a gap through which the gas can pass, and is provided in the discharge flow path. A first heat absorbing part capable of absorbing heat, and a second heat absorbing part arranged in the discharge flow path, having a gap through which gas can pass, and capable of absorbing heat of the flame, and the discharge flow path, An inlet part that can communicate with the storage space and an outlet part that can communicate with the external space of the casing are provided, and when the direction from the inlet part to the outlet part is the downstream direction, the direction of the downstream of the first heat absorbing part is The second heat absorbing portion is provided at the position, and a space is formed between the first heat absorbing portion and the second heat absorbing portion.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the battery housing body which becomes advantageous in reliably suppressing the flame from going outside even if the battery ignites.

FIG. 3 is a cross-sectional view showing the battery housing body according to the first embodiment. FIG. 7 is a cross-sectional view showing a battery housing body according to a second embodiment. It is sectional drawing of the electric vacuum cleaner by Embodiment 3. It is sectional drawing of the electric vacuum cleaner by Embodiment 3.

  Hereinafter, embodiments will be described with reference to the drawings. In each drawing, common or corresponding elements are designated by the same reference numerals, and overlapping description will be simplified or omitted.

Embodiment 1.
FIG. 1 is a sectional view showing a battery housing according to the first embodiment. As shown in FIG. 1, the battery housing 1 of the present embodiment includes a casing 2 and a flameproof mechanism 3. The casing 2 has a storage space 2b surrounded by an inner wall surface 2a. The battery 4 is stored in the storage space 2b. The flameproof mechanism 3 has a function of suppressing the flame from coming out of the battery housing 1 when the battery 4 ignites.

  The battery housing 1 is used by being arranged inside a device (not shown in the present embodiment) that consumes or stores electric power. This device may be, for example, a portable home appliance, a portable device carried by a user, a mobile object such as an electric vehicle or a hybrid vehicle, an uninterruptible power supply device, an emergency power supply device, It may be a stationary device such as a power storage device.

  The storage space 2b is a closed space which is entirely surrounded by the inner wall surface 2a. The casing 2 has, for example, a rectangular parallelepiped outer shape. The storage space 2b has, for example, a rectangular parallelepiped shape. The outer shape of the casing 2 and the shape of the storage space 2b are not limited to a rectangular parallelepiped shape, but may be another shape such as a columnar shape, and can be set to an arbitrary shape depending on the shape of the battery 4, for example.

  Although illustration is omitted, the casing 2 has, for example, a configuration in which two members are combined, and by separating the two members, the battery 4 is put into the storage space 2b or the battery 4 is taken out from the storage space 2b. You can The two members may be, for example, two members corresponding to the upper case and the lower case, or the other member corresponding to the lid may close the opening of one member. The means for holding the two members in a combined state may be, for example, one that uses screwing, or one that uses a snap fit such as an engaging claw portion.

  The material forming the casing 2 may be, for example, a resin material, a metal material, or a combination of resin and metal. When a resin material is used, a material having excellent heat resistance and flame retardancy may be adopted.

  The battery 4 is, for example, a lithium ion secondary battery. Alternatively, the battery 4 may be, for example, a nickel-cadmium storage battery or a nickel-hydrogen storage battery.

  The battery 4 has at least one unit cell. The battery 4 may correspond to an assembled battery constructed by using one or more single cells, may correspond to a module having a connected single cell group, or may include one or more single cells or It may correspond to a battery pack which is a unit incorporating a module, or may correspond to a battery system which is a system incorporating one or more single cells, modules or battery packs. The battery 4 may include a protection device such as a fuse, a protection circuit, a monitoring circuit, a control device, and a battery management unit.

  In FIG. 1, for the sake of clarity, a large gap is formed between the inner wall surface 2a of the casing 2 and the battery 4, but such a large gap is not actually necessary. Further, a holding member (not shown) for holding the battery 4 may be provided so that the battery 4 does not move in the storage space 2b.

  The battery 4 may catch fire in case of emergency. For example, the battery 4 may be ignited when there is a defect at the time of manufacture or when the battery 4 is used under a condition exceeding a predetermined use range. Particularly, in the case of a lithium ion secondary battery, there is a possibility of intense ignition.

  The flameproof mechanism 3 includes an exhaust flow path 5, a first heat absorbing section 6, and a second heat absorbing section 7. The discharge flow path 5 is formed outside the storage space 2b. The discharge flow path 5 is a flow path capable of discharging gas from the storage space 2b to the outside of the battery housing body 1. The gas generated from the battery 4 when the battery 4 is ignited is discharged to the outside of the battery housing body 1 through the discharge flow path 5. As a result, it is possible to prevent the pressure in the storage space 2b from rising excessively, and it is possible to reliably prevent the casing 2 from being destroyed.

  The discharge flow path 5 has an inlet portion 5a capable of communicating with the storage space 2b and an outlet portion 5b capable of communicating with the outer space of the casing 2. In the following description, the direction from the inlet portion 5a to the outlet portion 5b is referred to as "downstream direction".

  The first heat absorbing part 6 is arranged in the discharge flow path 5. The first heat absorbing portion 6 has a gap through which gas can pass. The first heat absorbing portion 6 has a heat capacity for absorbing the heat of the flame. The gas that has flowed into the discharge passage 5 when the battery 4 ignites flows in the downstream direction through the gap that the first heat absorbing portion 6 has. When the gas passing through the first heat absorbing portion 6 is burning, the first heat absorbing portion 6 absorbs heat to lower the temperature of the gas, thereby extinguishing the flame.

  The second heat absorbing section 7 is arranged in the discharge flow path 5. The second heat absorbing section 7 is located downstream of the first heat absorbing section 6. The second heat absorbing portion 7 has a gap through which gas can pass. The second heat absorbing section 7 has a heat capacity for absorbing the heat of the flame. The gas that has flown into the discharge passage 5 when the battery 4 ignites flows in the downstream direction through the gap of the second heat absorbing section 7. When the gas passing through the second heat absorbing part 7 is burning, the second heat absorbing part 7 absorbs heat to lower the temperature of the gas, thereby extinguishing the flame. A space 9 is formed between the first heat absorbing portion 6 and the second heat absorbing portion 7. That is, the second heat absorbing section 7 is not in contact with the first heat absorbing section 6.

  It is desirable that each of the first endothermic portion 6 and the second endothermic portion 7 is made of a material having high thermal conductivity, such as metal, ceramics, or a combination thereof. Examples of the metal include copper, aluminum, and alloys containing them. Further, it is desirable that each of the first endothermic portion 6 and the second endothermic portion 7 has a large number of holes or fins in order to increase the specific surface area. Thereby, the heat transfer coefficient can be improved and the heat of the flame can be absorbed with higher efficiency.

  As a specific example, each of the first endothermic part 6 and the second endothermic part 7 may be, for example, a porous metal foam, a metal net, a metal wool, a metal wire, It may be an aggregate of metal plates, metal balls or metal pieces, a porous body made of ceramics, a structure having fins made of metal or ceramics, or a combination of two or more of these. It may be one.

  The first heat absorbing portion 6 and the second heat absorbing portion 7 may be made of a common material or may be made of different materials. It is desirable that the size of the gap through which the gas can pass, which is included in the first heat absorbing portion 6 and the second heat absorbing portion 7, be equal to or less than the extinction distance.

  The total amount of the gas flowing into the discharge flow path 5 from the storage space 2b when the battery 4 is ignited passes through the first heat absorbing section 6 and the second heat absorbing section 7 in order. That is, the total amount of the gas discharged from the battery 4 and entering the discharge flow path 5 when the battery 4 ignites passes through the first heat absorbing section 6 and the second heat absorbing section 7 in order. Therefore, according to the present embodiment, the heat of the high-temperature gas released from the battery 4 can be reliably absorbed by both the first heat absorbing section 6 and the second heat absorbing section 7. Therefore, it is possible to reliably prevent the flame from going out of the battery housing 1.

  In particular, according to the present embodiment, the following effects can be obtained by providing the space 9 between the first heat absorbing section 6 and the second heat absorbing section 7. When the burning gas, that is, the flame, flows into the discharge flow path 5 when the battery 4 is ignited, the first heat absorbing portion 6 quenches the flame, but the temperature of the gas leaving the first heat absorbing portion 6 rises again. It may reignite. Even if re-ignition occurs in the space 9 in this way, the re-ignited gas is extinguished by passing through the second heat absorbing section 7. Therefore, it is possible to more reliably suppress the flame from coming out of the battery housing 1. In the present embodiment, since the space 9 is formed between the first heat absorbing section 6 and the second heat absorbing section 7, heat conduction from the first heat absorbing section 6 to the second heat absorbing section 7 is suppressed. be able to. Therefore, the second heat absorbing portion 7 can be maintained at a low temperature. Therefore, the second heat absorbing section 7 can more surely extinguish the re-ignited gas.

  Unlike the present embodiment, assuming that the second endothermic part 7 is in contact with the first endothermic part 6, the heat of the first endothermic part 6 is conducted to the second endothermic part 7 so that the second endothermic part 7 Temperature easily rises. Therefore, there is a possibility that the reliable flame extinction by the second heat absorbing portion 7 cannot be expected.

  The distance between the first endothermic part 6 and the second endothermic part 7, that is, the length of the space 9 along the axial direction of the discharge flow path 5, is between the first endothermic part 6 and the second endothermic part 7. It may be a distance or a length that can form the air heat insulating layer, and may be, for example, several mm or more.

  In the present embodiment, the heat capacity of the entire second heat absorbing section 7 is smaller than the heat capacity of the entire first heat absorbing section 6. As a result, the following effects are obtained. The size and mass of the second heat absorbing section 7 can be made smaller than the size and mass of the first heat absorbing section 6. As a result, the flameproof mechanism 3 can be reduced in size and weight, and in turn, the battery housing 1 can be reduced in size and weight. Since the gas after the heat is absorbed by the first heat absorbing portion 6 flows into the second heat absorbing portion 7, the temperature of the gas flowing into the second heat absorbing portion 7 is higher than the temperature of the gas flowing into the first heat absorbing portion 6. Is also low. Therefore, even if the heat capacity of the second heat absorbing section 7 is smaller than that of the first heat absorbing section 6, the second heat absorbing section 7 can surely quench the flame.

  In the illustrated example, the volume of the space occupied by the first heat absorbing section 6 is larger than the volume of the space occupied by the second heat absorbing section 7. As a modified example, the volume of the space occupied by the first heat absorbing section 6 and the volume of the space occupied by the second heat absorbing section 7 may be approximately the same. In that case, for example, by configuring the first endothermic portion 6 with a substance having a higher specific heat than the substance forming the second endothermic portion 7, the heat capacity of the first endothermic portion 6 is changed to the heat capacity of the second endothermic portion 7. It is possible to make it larger than.

  Instead of the configuration of the present embodiment described above, the heat capacity of the entire second heat absorbing portion 7 may be equal to the heat capacity of the entire first heat absorbing portion 6, or the entire second heat absorbing portion 7 may be used. The heat capacity of may be larger than the heat capacity of the entire first heat absorbing section 6.

  The flameproof mechanism 3 in the present embodiment further includes a third heat absorbing portion 8. The third heat absorbing section 8 is arranged in the discharge flow path 5. The third heat absorbing section 8 is located downstream of the second heat absorbing section 7. The third heat absorbing portion 8 has a gap through which gas can pass. The third heat absorbing portion 8 has a heat capacity for absorbing the heat of the flame. The gas that has flowed into the discharge flow path 5 when the battery 4 ignites flows in the downstream direction through the gap of the third heat absorbing section 8. When the gas passing through the third heat absorbing portion 8 is burning, the third heat absorbing portion 8 absorbs heat to lower the temperature of the gas, thereby extinguishing the flame. A space 12 is formed between the second heat absorbing portion 7 and the third heat absorbing portion 8. That is, the third heat absorbing portion 8 is not in contact with the second heat absorbing portion 7.

  As the material of the third heat absorbing portion 8, for example, the material described above as the material of the first heat absorbing portion 6 and the second heat absorbing portion 7 can be used.

  The gas that has flowed into the discharge flow path 5 from the storage space 2b when the battery 4 is ignited passes through the first endothermic part 6, the second endothermic part 7, and the third endothermic part 8 in order. That is, the total amount of the gas discharged from the battery 4 and entering the discharge flow path 5 when the battery 4 ignites passes through the first endothermic part 6, the second endothermic part 7, and the third endothermic part 8 in order. Therefore, according to the present embodiment, the heat of the high-temperature gas released from the battery 4 is surely absorbed at the three locations of the first heat absorbing section 6, the second heat absorbing section 7, and the third heat absorbing section 8. be able to. Therefore, it is possible to more reliably suppress the flame from coming out of the battery housing 1.

  According to the present embodiment, the following effects can be obtained by providing the third heat absorbing section 8. Even if the gas exiting the second heat absorbing part 7 reignites at the time of ignition of the battery 4, the reignited gas is extinguished by passing through the third heat absorbing part 8. Therefore, it is possible to more reliably suppress the flame from coming out of the battery housing 1. In the present embodiment, since the space 12 is formed between the second heat absorbing portion 7 and the third heat absorbing portion 8, the heat conduction from the second heat absorbing portion 7 to the third heat absorbing portion 8 is suppressed. be able to. Therefore, the third heat absorbing portion 8 can be maintained at a low temperature. For this reason, the third heat absorbing portion 8 can more reliably extinguish the re-ignited gas.

  The distance between the second endothermic part 7 and the third endothermic part 8, that is, the length of the space 12 along the axial direction of the discharge flow path 5, is between the second endothermic part 7 and the third endothermic part 8. It may be a distance or a length that can form the air heat insulating layer, and may be, for example, about several mm or more.

  In the present embodiment, the heat capacity of the entire third heat absorbing portion 8 is smaller than the heat capacity of the entire second heat absorbing portion 7. As a result, the following effects are obtained. The size and mass of the third heat absorbing section 8 can be made smaller than the size and mass of the second heat absorbing section 7. As a result, the flameproof mechanism 3 can be reduced in size and weight, and in turn, the battery housing 1 can be reduced in size and weight. Since the gas after the heat is absorbed by the second heat absorbing part 7 flows into the third heat absorbing part 8, the temperature of the gas flowing into the third heat absorbing part 8 is higher than the temperature of the gas flowing into the second heat absorbing part 7. Is also low. Therefore, even if the heat capacity of the third heat absorbing portion 8 is smaller than that of the second heat absorbing portion 7, the third heat absorbing portion 8 can surely quench the flame.

  Instead of the configuration of the present embodiment described above, the heat capacity of the entire third heat absorbing portion 8 may be equal to the heat capacity of the entire second heat absorbing portion 7, or the entire third heat absorbing portion 8 may be used. The heat capacity may be larger than the heat capacity of the entire second heat absorbing section 7.

  The battery housing 1 may not include the third heat absorbing section 8 as described above. Even if the third heat absorbing portion 8 is not provided, the first heat absorbing portion 6 and the second heat absorbing portion 7 can reliably prevent the flame from going out of the battery housing body 1. In addition, the battery housing 1 may further include another heat absorbing portion in the downstream direction of the third heat absorbing portion 8.

  The discharge flow path 5 in the present embodiment is formed by the flow path forming member 11. The flow path forming member 11 is, for example, a member having a tubular shape. The material forming the flow path forming member 11 may be, for example, a resin material, a metal material, or a combination of resin and metal. When a resin material is used, it is preferable that it has excellent heat resistance and flame retardancy. The constituent material of the flow path forming member 11 may be the same as or different from the constituent material of the casing 2. When the constituent material of the flow path forming member 11 is different from the constituent material of the casing 2, it is desirable that the constituent material of the flow path forming member 11 has higher heat resistance and flame retardancy than the constituent material of the casing 2. In the present embodiment, the flow path forming member 11 has a portion embedded in the wall forming the casing 2 and a portion arranged along the outer surface of the casing 2. In the illustrated example, the entire discharge flow path 5 is formed by the flow path forming member 11, but at least a part of the discharge flow path 5 may be formed integrally with the casing 2, for example.

  The battery housing body 1 of the present embodiment includes the closing portion 10 that closes the inlet portion 5 a of the discharge flow path 5. In a normal state before the battery 4 is ignited, the closing portion 10 closes the inlet portion 5a, so that the fluid cannot pass between the storage space 2b and the discharge passage 5. In the illustrated example, the closed portion 10 is formed by overlapping the thin portion in which a part of the wall forming the casing 2 is thin and the end surface portion formed so as to close the end opening of the flow path forming member 11. Has been done. Instead of such a configuration, the closing portion 10 may be formed by only one of the thin portion and the end surface portion, or the closing portion may be formed by a member different from the casing 2 and the flow path forming member 11. 10 may be formed.

  When the battery 4 ignites, the battery 4 releases gas to increase the pressure in the storage space 2b. When the pressure in the storage space 2b rises, the closing portion 10 pushed by the pressure deforms and breaks so as to expand to the outside of the storage space 2b. As a result, the closing portion 10 opens and the inlet portion 5a communicates with the storage space 2b. In this way, when the battery 4 is ignited, the gas in the storage space 2b can flow into the discharge passage 5.

  The strength of the closed portion 10 is lower than the strength of other portions of the casing 2. Therefore, when the pressure in the storage space 2b rises, the blocking portion 10 is reliably destroyed before the other parts of the casing 2 are destroyed. Therefore, when the battery 4 is ignited, the gas released from the battery 4 can surely flow into the discharge flow path 5 of the flameproof mechanism 3, so that the flame is surely discharged from the other part of the casing 2. It can be prevented. In the illustrated example, the wall of the closed portion 10 is made thinner than the wall of the other portion of the casing 2 to reduce the strength of the closed portion 10. .. Not limited to such a configuration, for example, the closing portion 10 may be made of a material having a lower strength than the casing 2 so that the closing portion 10 has a lower strength. For example, a fragile portion such as a notch may be formed. It may be configured such that the strength of the closed portion 10 is reduced by forming the closed portion 10.

  In the present embodiment, there is a space between the closing portion 10 and the first heat absorbing portion 6, and the closing portion 10 is not in contact with the first heat absorbing portion 6. When the pressure in the storage space 2b rises, the presence of this space allows the closed portion 10 to freely deform outward. As a result, the closed portion 10 is more surely broken and opened, and the gas in the storage space 2b can reliably flow into the discharge flow path 5.

According to the present embodiment, the following effects can be obtained by including the closing portion 10.
(First effect) At the initial stage of ignition of the battery 4, it is possible to prevent outside air from flowing into the storage space 2b from the discharge flow path 5. As a result, the interior of the storage space 2b becomes deficient in oxygen, so there is a possibility that the ignition of the battery 4 can be extinguished before the battery 4 reaches a large ignition.
(Second effect) The casing 4 and the battery 4 may be burned by the spread of fire from another external device rather than the battery 4 itself being a source of fire. In such a case, the casing 2 is burned prior to the battery 4, and the pressure in the storage space 2b does not rise, so that the closed portion 10 may remain without being destroyed. Therefore, in the case where the casing 2 and the battery 4 are burnt out, it is possible to prove that the battery 4 itself did not become the origin of the fire when the closed portion 10 remained without being destroyed.

  As a modified example, the inlet portion 5a of the discharge flow path 5 may be configured to communicate with the storage space 2b from the beginning without providing the closing portion 10.

  The battery 4 in the present embodiment includes a container 4a that is an exterior of the battery 4. The container 4a has a first portion 4b, a second portion 4c, and a sealing portion 4d. The container 4a is formed by combining the first portion 4b and the second portion 4c and sealing the joint between the first portion 4b and the second portion 4c by the sealing portion 4d. In the illustrated example, the second portion 4c corresponds to a lid that closes the opening of the first portion 4b.

  The battery 4 has an exhaust port 4e formed in the container 4a. The exhaust port 4e is an opening for preventing the battery 4 from exploding by allowing the gas to escape to the outside of the battery 4 when the gas is generated inside the battery 4. The exhaust port 4e may be provided with an explosion-proof valve configured to break and release gas when the pressure inside the battery 4 is abnormally increased. In the illustrated example, the exhaust port 4e is formed in the second portion 4c.

  The casing 2 in the present embodiment has a first wall 2c and a second wall 2d. The inner surfaces of the first wall 2c and the second wall 2d form a part of the inner wall surface 2a. The inlet portion 5a of the discharge channel 5 is located on the first wall 2c. The second wall 2d is located at a position facing the first wall 2c. The battery 4 is located between the first wall 2c and the second wall 2d.

  In the present embodiment, the exhaust port 4e of the battery 4 is located closer to the first wall 2c than the second wall 2d. That is, the distance between the exhaust port 4e and the first wall 2c is shorter than the distance between the exhaust port 4e and the second wall 2d. As a result, the following effects are obtained. When the battery 4 is ignited, gas may be rapidly ejected from the exhaust port 4e. When the gas is rapidly ejected from the exhaust port 4e, the pressure in the vicinity of the first wall 2c close to the exhaust port 4e becomes higher in the casing 2 than in the vicinity of the second wall 2d far from the exhaust port 4e. Pressure distribution occurs. When the pressure in the vicinity of the first wall 2c becomes high, the gas in the vicinity of the first wall 2c smoothly flows into the discharge passage 5 from the gas in the vicinity of the first wall 2c by locating the gas inlet 5a in the first wall 2c. Therefore, it is promptly discharged to the outside. Therefore, it is possible to more reliably prevent the internal pressure of the casing 2 from excessively rising, and it is possible to more reliably prevent the casing 2 from bursting due to the excessive increase of the internal pressure.

  In the present embodiment, the sealing portion 4d of the battery 4 is located closer to the first wall 2c than the second wall 2d. That is, the distance between the sealing portion 4d and the first wall 2c is shorter than the distance between the sealing portion 4d and the second wall 2d. As a result, the following effects are obtained. When the battery 4 is ignited and the exhaust port 4e is not opened for some reason, or the battery 4 does not have the exhaust port 4e, gas may be ejected from the sealing portion 4d. When the gas is ejected from the sealing portion 4d, the pressure in the vicinity of the first wall 2c close to the sealing portion 4d becomes higher in the casing 2 than in the vicinity of the second wall 2d far from the sealing portion 4d. Such a pressure distribution occurs. When the pressure in the vicinity of the first wall 2c becomes high, the gas in the vicinity of the first wall 2c smoothly flows into the discharge passage 5 from the gas in the vicinity of the first wall 2c by locating the gas inlet 5a in the first wall 2c. Therefore, it is promptly discharged to the outside. Therefore, it is possible to more reliably prevent the internal pressure of the casing 2 from excessively rising, and it is possible to more reliably prevent the casing 2 from bursting due to the excessive increase of the internal pressure.

  The casing 2 in the present embodiment has a third wall 2e and a fourth wall 2f. The third wall 2e connects the first wall 2c and the second wall 2d. The fourth wall 2f connects the first wall 2c and the second wall 2d. The fourth wall 2f is in a position facing the third wall 2e. The battery 4 is located between the third wall 2e and the fourth wall 2f. The third wall 2e and the fourth wall 2f extend in the vertical direction with respect to the first wall 2c and the second wall 2d.

  The discharge flow path 5 in the present embodiment has a curved portion 5c at a position midway in the flow direction. The direction of the central axis of the discharge flow path 5 changes in the curved portion 5c. In the illustrated example, the central axis of the discharge flow passage 5 from the inlet portion 5a to the curved portion 5c is perpendicular to the first wall 2c, and the central axis of the discharge flow passage 5 from the curved portion 5c to the outlet portion 5b is It is parallel to the first wall 2c. In the illustrated example, the discharge flow path 5 is bent at the curved portion 5c, but the curved portion 5c may be formed so as to be curved smoothly.

  According to the present embodiment, the following effects can be obtained by providing the curved portion 5c. When the battery 4 ruptures, fragments may fly into the inlet portion 5a of the discharge flow path 5. In such a case, it is possible to more reliably prevent the fragments from jumping out from the outlet 5b. When the battery 4 is ignited, the battery 4 cannot be seen through the outlet 5b when the outlet 5b is viewed from the outside of the battery housing 1. Therefore, it is possible to reliably prevent the light emission of the battery 4 from entering the eyes of a person, and thus it is possible to more reliably prevent the person from being surprised. Since the flow velocity of the gas flowing through the discharge passage 5 can be reduced by the curved portion 5c, the flow velocity of the gas ejected from the outlet portion 5b can be reduced. Therefore, it is possible to more reliably prevent the gas ejected from the outlet portion 5b from damaging surrounding objects.

  The first heat absorbing portion 6 is arranged on the curved portion 5c. A part of the discharge flow path 5 from the inlet portion 5a to the curved portion 5c is located inside the first wall 2c. The discharge flow path 5 from the curved portion 5c to the outlet portion 5b is located outside the first wall 2c, that is, outside the casing 2. In the following description, the cross-sectional area cut along a plane perpendicular to the axial direction of the flow channel is referred to as the flow channel cross-sectional area. In the present embodiment, the flow passage cross-sectional area of the discharge flow passage 5 from the curved portion 5c to the outlet portion 5b is smaller than the flow passage cross-sectional area of the discharge flow passage 5 from the inlet portion 5a to the curved portion 5c. As a result, the discharge passage 5 in the portion located outside the casing 2 becomes thin, which is advantageous for downsizing the battery housing 1.

  The battery housing body 1 of the present embodiment includes a closing portion 13 that closes the outlet portion 5b of the discharge flow path 5. In a normal state before the battery 4 is ignited, the closing portion 13 closes the outlet portion 5b, so that the fluid cannot pass between the discharge flow path 5 and the external space of the battery housing 1. In the illustrated example, the closing portion 13 is formed by the end surface portion formed so as to close the end opening of the flow path forming member 11. Instead of such a configuration, the blocking portion 13 may be formed by a member other than the flow path forming member 11.

  When the battery 4 is ignited, the closing portion 13 is pushed by the pressure of the gas flowing into the discharge flow path 5 from the storage space 2b, so that the closing portion 13 opens and the outlet portion 5b communicates with the external space of the battery housing 1. .. In this way, when the battery 4 is ignited, the gas in the discharge passage 5 can flow out to the external space of the battery housing 1.

According to the present embodiment, the following effects can be obtained by providing the closing portion 13.
(First effect) At the initial stage of ignition of the battery 4, it is possible to prevent outside air from flowing into the storage space 2b from the discharge flow path 5. As a result, the interior of the storage space 2b becomes deficient in oxygen, so there is a possibility that the ignition of the battery 4 can be extinguished before the battery 4 reaches a large ignition.
(Second effect) The casing 4 and the battery 4 may be burned out due to the spread of fire from another device rather than the source of the battery 4 itself. In such a case, the casing 2 is burned prior to the battery 4, so that the pressure in the storage space 2b does not rise, and therefore the closed portion 13 may remain without being broken. Therefore, in the case where the casing 2 and the battery 4 are burnt out, it is possible to prove that the battery 4 itself did not become the origin of the fire when the blocking portion 13 remained without being destroyed.
(Third effect) It is possible to reliably prevent external foreign matter from entering the discharge passage 5 from the outlet portion 5b during normal use. Therefore, it is possible to reliably prevent the discharge flow path 5 from being blocked by foreign matter.

  As a modified example, the outlet portion 5b of the discharge flow path 5 may be configured to communicate with the external space from the beginning without providing the closing portion 13.

  A wiring 14 for transmitting electric power, control signals, etc. is connected to the battery 4. The wiring 14 extends to the outside of the casing 2 through the inner cavity of the bush 15 provided in the through hole 2g penetrating the wall of the casing 2. The bush 15 closes the gap between the through hole 2g and the wiring 14. In the present embodiment, a flameproof mechanism similar to the flameproof mechanism 3 described above may be provided so as to be connected to the through hole 2g. By doing so, when the battery 4 is ignited, it is possible to reliably prevent the burning gas flame from passing through the through hole 2g to the outside of the battery housing 1.

Embodiment 2.
Second Embodiment Next, a second embodiment will be described with reference to FIG. 2. The differences from the first embodiment will be mainly described, and elements common to or corresponding to the elements described above will be denoted by the same reference numerals. , And duplicate description is simplified or omitted. FIG. 2 is a sectional view showing a battery housing according to the second embodiment. As shown in FIG. 2, the battery housing body 16 of the present embodiment differs from the battery housing body 1 of the first embodiment in that a plurality of flameproof mechanisms are provided for one casing 2.

  The battery housing body 16 of the present embodiment includes a first flameproof mechanism 3A and a second flameproof mechanism 3B as a plurality of flameproof mechanisms. The first flameproof mechanism 3A has the same structure as the flameproof mechanism 3 in the first embodiment and is arranged at the same position. Second flameproof mechanism 3B has a configuration similar to or similar to flameproof mechanism 3 in the first embodiment. The inlet portion 5a of the discharge flow path 5 included in the second flameproof mechanism 3B is located on the fourth wall 2f of the casing 2. The discharge flow path 5 included in the second flameproof mechanism 3B includes a portion located inside the fourth wall 2f and a portion arranged along the outer surface of the fourth wall 2f, that is, a portion located outside the casing 2. Have.

According to the present embodiment, the following effects can be obtained by including the first flameproof mechanism 3A and the second flameproof mechanism 3B.
(First effect) When the battery 4 is ignited, the closing portion 10 of the first flameproof mechanism 3A opens earlier than the closing portion 10 of the second flameproof mechanism 3B, and the gas released from the battery 4 becomes first. It is assumed that the gas has started to be discharged to the outside through the discharge flow path 5 of the flameproof mechanism 3A. If the amount of gas released from the battery 4 per unit time is larger than the amount of gas discharged per unit time to the outside by the first flameproof mechanism 3A, then the internal pressure of the casing 2 is increased thereafter. May rise further. In such a case, if the internal pressure of the casing 2 further rises, the closed portion 10 of the second flameproof mechanism 3B is opened, and the gas in the casing 2 is also discharged from the second flameproof mechanism 3B to the outside. To be done. As a result, since the internal pressure of the casing 2 can be reduced, it is possible to more reliably prevent the casing 2 from breaking.
(Second effect) Even when the discharge passage 5 of either the first flameproof mechanism 3A or the second flameproof mechanism 3B is blocked by foreign matter when the battery 4 is ignited, The discharged gas can be reliably discharged to the outside through the discharge passage 5 of either the first flameproof mechanism 3A or the second flameproof mechanism 3B. In this way, the first flameproof mechanism 3A and the second flameproof mechanism 3B function as backups for each other, so that it is possible to more reliably prevent the flame from coming out of the battery housing 16 when the battery 4 is ignited.

  In the present embodiment, the outlet portion 5b of the discharge passage 5 of the first flameproof mechanism 3A and the outlet portion 5b of the discharge passage 5 of the second flameproof mechanism 3B are located adjacent to each other. Therefore, there is an advantage that it is easy to specify the position where the gas is ejected to the outside when the battery 4 is ignited.

  By setting the strength of the closed portion 10 of the first flameproof mechanism 3A to be lower than the strength of the closed portion 10 of the second flameproof mechanism 3B, the closed portion 10 of the first flameproof mechanism 3A becomes the second flameproof mechanism 3B. It may be configured such that it is always opened prior to the closing portion 10. By doing so, when the battery 4 is ignited, gas is always discharged from the outlet portion 5b of the discharge passage 5 of the first flameproof mechanism 3A before the outlet portion 5b of the discharge passage 5 of the second flameproof mechanism 3B. Can be spouted.

Embodiment 3.
Next, a third embodiment will be described with reference to FIGS. 3 and 4, but a description will be given focusing on differences from the above-described embodiment, and elements common to or corresponding to the elements described above are the same. , And duplicate description will be simplified or omitted.

  3 and 4 are sectional views of the electric vacuum cleaner 17 according to the third embodiment. The electric vacuum cleaner 17 shown in these drawings is an electric vacuum cleaner of a type generally called a stick cleaner. The electric vacuum cleaner 17 includes a housing 18 having a tubular portion, a handle 19 connected to the housing 18, and an operation unit 20 for a user to operate. The handle 19 corresponds to a handle that the user holds. When cleaning with the electric vacuum cleaner 17, the user grips the handle 19 and moves the electric vacuum cleaner 17. The operation unit 20 includes, for example, a button for turning on / off the power of the electric vacuum cleaner 17, a button for adjusting the suction force, and the like. The handle 19 is provided on the upper side of the housing 18 in FIGS. 3 and 4. The operation unit 20 is installed on the handle 19.

  FIG. 3 is a view in which the electric vacuum cleaner 17 is cut along a plane including the central axis of the tubular portion of the housing 18. In FIG. 3, only a part of the electric vacuum cleaner 17 is shown. FIG. 4 is a sectional view taken along line IV-IV in FIG. Inside the housing 18, the battery housing 1 similar to that of the first embodiment is arranged. The electric vacuum cleaner 17 is an example of an electric device that operates by receiving power supply from the battery 4 of the battery housing 1. In addition, a part of the battery housing 1 (for example, the casing 2) and a part of the electric vacuum cleaner 17 (for example, the housing 18) may be integrally formed.

  3 and 4, the battery housing 1 is simplified and schematically shown, and the battery 4 is not shown. FIG. 4 corresponds to a cross-sectional view of the electric vacuum cleaner 17 taken along a plane including the central axis of the outlet portion 5b of the discharge passage 5 of the flameproof mechanism 3 included in the battery housing 1. The electric vacuum cleaner 17 includes an electric blower for generating a suction force for sucking dust, a dust separating unit for separating dust from dust-containing air, a dust collecting unit for collecting the separated dust, and a control board on which a control circuit is formed. Although it is further provided with, and the like, illustration is omitted in FIGS. 3 and 4.

  The battery housing 1 is arranged such that the outlet portion 5b of the discharge channel 5 faces downward in FIGS. 3 and 4. The proximity wall 18 a in FIG. 4 corresponds to a wall of the wall forming the housing 18 of the electric vacuum cleaner 17 at a position where the distance to the battery housing 1 is the shortest. In FIG. 4, the proximity wall 18 a is located above the battery housing 1. Openings such as ventilation holes may be formed in the walls forming the housing 18, including the proximity wall 18a. As shown in FIG. 4, the direction FD in which the gas flows out from the outlet portion 5b when the battery 4 is ignited is the direction away from the above-described proximity wall 18a.

  Different from the present embodiment, assuming that the outlet portion 5b is open toward the proximity wall 18a, when the high temperature gas is ejected from the outlet portion 5b when the battery 4 is ignited, the high temperature gas is discharged from the housing. Hitting the wall of 18 directly can damage housing 18. Further, when an opening such as a vent is formed in the proximity wall 18a, the high temperature gas ejected from the outlet 5b may be blown out of the housing 18 through the opening.

  In contrast to this, in the present embodiment, the direction FD in which the gas flows out from the outlet portion 5b is the direction away from the proximity wall 18a. Therefore, it is possible to suppress the high temperature gas ejected from the outlet portion 5b from directly hitting the wall forming the housing 18. As a result, it is possible to reduce the possibility that the housing 18 will be damaged or that high-temperature gas will be blown out of the housing 18.

  Further, in the present embodiment, the direction FD in which the gas flows out from the outlet portion 5b is the direction away from the handle 19 and the operation portion 20. Therefore, it is possible to reliably suppress the high temperature gas ejected from the outlet portion 5b when the battery 4 is ignited from flowing toward the handle 19 and the operating portion 20. Therefore, even if the user touches the handle 19 and the operation unit 20 with the hand, it is possible to reliably suppress the flow of the high temperature gas toward the hand. If the direction FD in which the gas flows out from the outlet portion 5b is the direction away from at least one of the handle 19 and the operating portion 20, an effect similar to the above effect can be obtained.

  In addition, you may implement combining two or more which can be combined among a plurality of above-mentioned embodiments.

DESCRIPTION OF SYMBOLS 1 Battery storage body, 2 Casing, 2a inner wall surface, 2b storage space, 2c 1st wall, 2d 2nd wall, 2e 3rd wall, 2f 4th wall, 2g through hole, 3 flameproof mechanism, 3A 1st flameproof Mechanism, 3B second flameproof mechanism, 4 battery, 4a container, 4b first part, 4c second part, 4d sealing part, 4e exhaust port, 5 discharge flow path, 5a inlet part, 5b outlet part, 5c bending part, 6 1st heat absorption part, 7 2nd heat absorption part, 8 3rd heat absorption part, 9 space, 10 block part, 11 flow path forming member, 12 space, 13 block part, 14 wiring, 15 bush, 16 battery container, 17 Vacuum cleaner, 18 housing, 18a proximity wall, 19 handle, 20 operation part

Claims (9)

A casing having a storage space surrounded by an inner wall surface,
And a flameproof mechanism for suppressing the flame from going out when the battery housed in the housing space ignites,
The flameproof mechanism is
A discharge flow path formed outside the storage space, capable of discharging gas from the storage space to the outside of the casing,
A first heat absorbing portion arranged in the discharge flow path, having a gap through which gas can pass, and capable of absorbing heat of flame,
A second heat absorbing portion that is disposed in the discharge flow path, has a gap through which gas can pass, and can absorb heat of a flame,
Equipped with
The discharge flow path has an inlet portion that can communicate with the storage space, and an outlet portion that can communicate with the external space of the casing,
When the direction from the inlet portion to the outlet portion is the downstream direction, the second heat absorbing portion is located at a position in the downstream direction with respect to the first heat absorbing portion, and the first heat absorbing portion and the second heat absorbing portion. A battery housing with a space formed between it and.   The battery housing according to claim 1, wherein a heat capacity of the second heat absorbing section is smaller than a heat capacity of the first heat absorbing section. A closing part for closing the inlet part,
The battery housing according to claim 1 or 2, wherein when the pressure of the storage space rises, the closing portion opens and the inlet portion communicates with the storage space.   The battery according to any one of claims 1 to 3, wherein the discharge channel has a curved portion at a position in the middle of the flow direction, and the direction of the central axis of the discharge channel changes at the curved portion. Storage body. The casing has a first wall in which the inlet portion is located, and a second wall facing the first wall,
The battery has an exhaust port that allows the gas to escape to the outside of the battery when gas is generated inside the battery,
The battery housing according to any one of claims 1 to 4, wherein the exhaust port is located closer to the first wall than the second wall. The casing has a first wall in which the inlet portion is located, and a second wall facing the first wall,
The battery includes a container having a sealing portion,
The battery housing according to any one of claims 1 to 5, wherein the sealing portion is located closer to the first wall than the second wall.   The battery housing according to claim 1, wherein a plurality of the flameproof mechanisms are provided in one casing. The battery housing is arranged inside an electric device,
In a cross section of the electric device cut along a plane including the central axis of the outlet, the direction in which gas flows out of the outlet is a distance from the battery housing body among the walls forming the casing of the electric device. The battery storage body according to any one of claims 1 to 7, wherein the battery storage body is in a direction away from a position where is shortest. The battery housing is arranged inside an electric device,
The electric device includes at least one of a handle for a user of the electric device to hold, and an operation unit for a user of the electric device to operate,
The battery housing according to any one of claims 1 to 8, wherein a direction in which gas flows out from the outlet is a direction away from at least one of the handle and the operation unit.

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