Battery device

Abstract

To provide a battery device that can quickly extinguish a fire when a battery cell ignites.SOLUTION: A battery device may include: battery cells, fire extinguishing agents 40, 42, 44, 46 including components that have a negative catalytic effect on combustion; flame-retardant members 48, 50 having a limiting oxygen index greater than atmospheric oxygen concentration; a resin casing that houses the battery cells, the fire extinguishing agents and the flame-retardant members. The fire extinguishing agents may be interposed between the battery cells and the casing. The flame-retardant members may be interposed between the fire extinguishing agents and the casing.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The technology disclosed in this specification relates to a battery device.

Background Art

[0002] Patent Document 1 discloses a battery device. The battery device includes a battery cell, a fireproof member whose volume expands when the battery cell burns, and a casing that houses the battery cell and the fireproof member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology of Patent Document 1, when the battery cell catches fire due to improper handling, it takes a certain amount of time until it is extinguished by the fireproof member. This specification provides a technology capable of quickly extinguishing a fire when the battery cell catches fire in a battery device.

Means for Solving the Problems

[0005] This specification discloses a battery device. The battery device may include a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, a flame retardant member whose limiting oxygen index is greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame retardant member. The fire extinguishing agent may be interposed between the battery cell and the casing. The flame retardant member may be interposed between the fire extinguishing agent and the casing.

[0006] According to the above configuration, when the battery cell catches fire due to improper handling, it can be quickly extinguished by the negative catalytic effect of the fire extinguishing agent. Further, according to the above configuration, even when the flame ignited from the battery cell in the battery device breaks through the fire extinguishing agent, the flame is blocked by the flame-retardant member, so that it is possible to suppress the flame from reaching the casing.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

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Figure 4

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Figure 6

Figure 7

Figure 8

Figure 9

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Figure 12

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Figure 14

Mode for Carrying Out the Invention

[0008] Regarding representative and non-limiting specific examples of the present invention, they will be described in detail below with reference to the drawings. This detailed description is simply intended to show those skilled in the art the details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. Also, the additional features and inventions disclosed can be used separately from, or together with, other features and inventions in order to provide a further improved battery device.

[0009] Also, the combinations of features and steps disclosed in the following detailed description are not essential when implementing the present invention in the broadest sense, and are described only for the purpose of explaining representative specific examples of the present invention in particular. Furthermore, the various features of the following representative specific examples, as well as the various features described in the claims, do not have to be combined as described in the specific examples here, or in the order listed, in order to provide additional and useful embodiments of the present invention.

[0010] All features described in this specification and / or in the claims are intended to be disclosed separately and independently of each other, as limitations on the initial disclosure and the specific matters described in the claims, apart from the configurations of the features described in the examples and / or in the claims. Furthermore, all descriptions regarding numerical ranges and groups or populations are made with the intention of disclosing intermediate configurations as limitations on the initial disclosure and the specific matters described in the claims.

[0011] In one or more embodiments, the battery device may include a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, a flame retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame retardant member. The fire extinguishing agent may be interposed between the battery cell and the casing. The flame retardant member may be interposed between the fire extinguishing agent and the casing. Note that the negative catalytic effect referred to in this specification means an effect of suppressing the chain reaction of combustion. As a component that has a negative catalytic effect on combustion, for example, a component that absorbs combustion gases such as hydrogen, hydrogen sulfide, carbon monoxide, methane, ethane, propane, and ethylene may be used. Alternatively, as a component that has a negative catalytic effect on combustion, a component that generates sodium chloride, sodium carbonate, sodium sulfate, etc. during combustion and suppresses the oxidation of combustibles may be used.

[0012] According to the above configuration, when the battery cell catches fire due to improper handling, it can be quickly extinguished by the negative catalytic effect of the fire extinguishing agent. Further, according to the above configuration, even when the flame ignited from the battery cell in the battery device breaks through the fire extinguishing agent, the flame can be blocked by the flame retardant member, so that it is possible to suppress the flame from reaching the casing.

[0013] In one or more embodiments, the battery cell may have a substantially cylindrical shape. The fire extinguishing agent and the flame retardant member may be interposed between the end face in the longitudinal direction of the battery cell and the casing.

[0014] When a battery cell having a substantially cylindrical shape catches fire, flames often extend from the end face of the battery cell. According to the above configuration, when the battery cell catches fire, the fire extinguishing agent is likely to be exposed to the flames, and the negative catalytic effect can be quickly exerted. When the battery cell catches fire due to improper handling, it can be quickly extinguished. Further, according to the above configuration, even when the flame extending from the end face of the battery cell breaks through the fire extinguishing agent, the flame can be blocked by the flame retardant member, so that it is possible to suppress the flame from reaching the casing.

[0015] In one or more embodiments, the battery device may further include a cell holder that holds the battery cell. The battery cell may be held by the cell holder such that the end face in the longitudinal direction is exposed on the side surface of the cell holder. The flame retardant member may cover the entire side surface of the cell holder.

[0016] According to the above configuration, since the entire side surface of the cell holder where the end face of the battery cell is exposed is covered with the flame retardant member, it is possible to suppress the flame extending from the end face of the battery cell from reaching the casing.

[0017] In one or more embodiments, the flame retardant member may be sandwiched between the cell holder and the casing.

[0018] According to the above configuration, when carrying and using the battery device, it is possible to prevent the position of the flame retardant member from shifting.

[0019] In one or more embodiments, the casing may be detachable from a backpack to which a shoulder strap is attached. The flame retardant member may be interposed between the portion of the casing facing the backpack and the battery cell.

[0020] According to the above configuration, when the battery cell catches fire due to improper handling, it is possible to suppress the flame from reaching the portion of the casing facing the backpack.

[0021] In one or more embodiments, the flame retardant member may be engaged with the casing.

[0022] According to the above configuration, when the battery device is carried and used, it is possible to prevent the position of the flame retardant member from shifting.

[0023] In one or more embodiments, the casing may have a boss protruding inward from the inner surface of the casing. The flame retardant member may have a through hole corresponding to the boss. By the boss entering the through hole, the flame retardant member may be engaged with the casing.

[0024] Bosses may be provided on the inner surface of the casing for positioning and screwing of the cell holder. According to the above configuration, the flame retardant member can be engaged with the casing by using the bosses provided on the casing.

[0025] In one or more embodiments, the flame retardant member may be attached to the casing.

[0026] According to the above configuration, when the battery device is carried and used, it is possible to prevent the position of the flame retardant member relative to the casing from shifting.

[0027] In one or more embodiments, the flame retardant member may be attached to the fire extinguishing agent.

[0028] According to the above configuration, when the battery device is carried and used, it is possible to prevent the position of the flame retardant member relative to the fire extinguishing agent from shifting.

[0029] In one or more embodiments, the battery device may further include a protective member that covers the flame retardant member.

[0030] According to the above configuration, even when an impact is applied to the battery device or water enters the inside of the battery device, the flame-retardant member can be protected.

[0031] In one or more embodiments, the protective member may cover the flame-retardant member and the fire extinguishing agent together.

[0032] According to the above configuration, even when an impact is applied to the battery device or water enters the inside of the battery device, the flame-retardant member and the fire extinguishing agent can be protected.

[0033] In one or more embodiments, the battery cell may be charged with a State of Charge (SOC) of 90% or more.

[0034] When the SOC of the battery cell is high, there is a risk of intense burning when the battery cell catches fire. According to the above configuration, it is possible to suppress intense burning when the battery cell catches fire due to improper handling. Also, even when the battery cell catches fire, it is possible to suppress the flame from reaching the casing.

[0035] In one or more embodiments, the energy density of the battery cell may be 300 Wh / liter or more. For example, the energy density of the battery cell may be 400 Wh / liter or more, 500 Wh / liter or more, 600 Wh / liter or more, or 700 Wh / liter or more.

[0036] When the energy density of the battery cell is high, there is a risk of intense burning when the battery cell catches fire. According to the above configuration, it is possible to suppress intense burning when the battery cell catches fire due to improper handling. Also, even when the battery cell catches fire, it is possible to suppress the flame from reaching the casing.

[0037] In one or more embodiments, the battery cell may comprise a lithium-ion battery cell.

[0038] Lithium-ion battery cells have a high risk of catching fire due to various causes compared to other types of battery cells. According to the above configuration, even if the lithium-ion battery cell catches fire due to improper handling, it can be extinguished promptly. Further, even when the lithium-ion battery cell catches fire, it is possible to suppress the flame from reaching the casing.

[0039] (Example 1) As shown in FIG. 1, the backpack-type power supply 2 of this embodiment includes a battery device 4, a backpack 6 to which the battery device 4 is detachably attached, a shoulder belt 8 attached to the backpack 6, and a waist belt 10 attached to the backpack 6. The user can hold the backpack-type power supply 2 on the back by putting the shoulder belt 8 over the shoulders and winding the waist belt 10 around the waist. In the following description, in the state where the user is carrying the backpack-type power supply 2 on the back, the vertical direction, the left-right direction, and the front-back direction as viewed from the user are referred to as the vertical direction, the left-right direction, and the front-back direction of the backpack-type power supply 2, respectively.

[0040] As shown in FIG. 2, the battery device 4 includes a charging plug 12, a discharge cable 14, a discharge plug 16, a remaining amount display lamp 18, and a remaining amount display button 20. The discharge plug 16 is provided at the tip of the discharge cable 14. The battery device 4 can be charged from an external power source by connecting the charging plug 12 to the external power source (not shown) via a charging cable (not shown). Also, as shown in FIG. 3, the battery device 4 can discharge to the electric working machine 52 by connecting the discharge cable 14 to the electric working machine 52. In the example shown in FIG. 3, the electric working machine 52 is a blower in which a battery pack (not shown) can be detachably attached to the battery pack attachment portion 52a. In the example shown in FIG. 3, an adapter 54 is attached to the battery pack attachment portion 52a of the electric working machine 52 instead of the battery pack, and the discharge plug 16 is connected to the adapter 54. Note that the electric working machine 52 may be configured to be directly connectable to the discharge plug 16 without passing through the adapter 54. Also, the electric working machine 52 may be, for example, another electric working machine such as a lawn mower or a chain saw, or a so-called electric tool such as a driver or a drill. The remaining amount display lamp 18 displays the remaining amount of the battery of the battery device 4. The remaining amount display button 20 switches the on and off of the display of the remaining amount of the battery by the remaining amount display lamp 18.

[0041] As shown in FIGS. 2 and 4, the battery device 4 includes a front casing 22, a rear casing 24, and an inner cover 26. The front casing 22, the rear casing 24, and the inner cover 26 are all members made of resin (for example, polycarbonate). In the following, the front casing 22, the rear casing 24, and the inner cover 26 are collectively referred to simply as the casing 28. The rear casing 24 and the inner cover 26 are each fixed to the front casing 22 by a fastening tool. The space surrounded by the front casing 22 and the inner cover 26 is hereinafter also referred to as an accommodation chamber 30 (see FIG. 5). A seal member (not shown) is provided at the connection portion between the front casing 22 and the inner cover 26. The accommodation chamber 30 is sealed from the outside by the seal member.

[0042] As shown in FIG. 5, the storage chamber 30 houses battery cell modules 34, 36, a control circuit board 38, fire extinguishing agents 40, 42, 44, 46, and flame retardant members 48, 50.

[0043] As shown in FIG. 6, the battery cell modules 34, 36 each include a plurality of battery cells 56, 58 (see FIG. 7), cell holders 60, 62 made of a resin (e.g., polycarbonate) that hold the plurality of battery cells 56, 58, and lead plates 64, 66 that electrically connect the plurality of battery cells 56, 58 to the control circuit board 38 (see FIG. 5). As shown in FIG. 5, the control circuit board 38 is fixed to the rear surfaces of the cell holders 60, 62 by fastening tools. The control circuit board 38 is, for example, a glass epoxy board.

[0044] As shown in FIG. 7, each of the plurality of battery cells 56, 58 is a secondary battery cell having, for example, a substantially cylindrical shape, and is, for example, a lithium-ion battery cell. Each of the plurality of battery cells 56, 58 has, for example, a cell shape of 18650 type, a volumetric energy density of 729 Wh / liter, a rated capacity of 3.35 Ah, and a rated voltage of 3.6 V. Note that each of the plurality of battery cells 56, 58 may have a volumetric energy density of 327 Wh / liter and a rated capacity of 1.5 Ah. Alternatively, each of the plurality of battery cells 56, 58 may have a volumetric energy density of 436 Wh / liter and a rated capacity of 2 Ah. Alternatively, each of the plurality of battery cells 56, 58 may have a volumetric energy density of 544 Wh / liter and a rated capacity of 2.5 Ah. Alternatively, each of the plurality of battery cells 56, 58 may have a volumetric energy density of 653 Wh / liter and a rated capacity of 3 Ah. Alternatively, each of the plurality of battery cells 56, 58 may have a cell shape of 21700 type, a volumetric energy density of 594 Wh / liter, a rated capacity of 4 Ah, and a rated voltage of 3.6 V. Note that each of the plurality of battery cells 56, 58 is not limited to a substantially cylindrical shape, and may be a so-called square type or a laminate type. The battery device 4 is such that each of the plurality of battery cells 56, 58 is charged with a State of Charge (SOC) of 90% or more. Each of the plurality of battery cells 56, 58 includes, as electrodes, a positive electrode 56a, 58a and a negative electrode 56b, 58b. The positive electrodes 56a, 58a are disposed on one end face in the longitudinal direction of the battery cells 56, 58, and the negative electrodes 56b, 58b are disposed on the other end face in the longitudinal direction of the battery cells 56, 58. The plurality of battery cells 56, 58 are arranged side by side in the front-rear direction and the up-down direction such that the longitudinal direction is along the left-right direction. In the present embodiment, the battery cell module 34 includes a total of 50 battery cells 56 arranged in 10 in the up-down direction and 5 in the front-rear direction, and the battery cell module 36 includes a total of 50 battery cells 58 arranged in 10 in the up-down direction and 5 in the front-rear direction.Some of the plurality of battery cells 56, 58 are held by cell holders 60, 62 such that the positive electrodes 56a, 58a are exposed on the right side of the cell holders 60, 62 and the negative electrodes 56b, 58b are exposed on the left side of the cell holders 60, 62. The remaining of the plurality of battery cells 56, 58 are held by cell holders 60, 62 such that the positive electrodes 56a, 58a are exposed on the left side of the cell holders 60, 62 and the negative electrodes 56b, 58b are exposed on the right side of the cell holders 60, 62. The lead plates 64 (see FIG. 6) are provided on the right and left sides of the battery cell module 34 and electrically connect the positive electrodes 56a and negative electrodes 56b of the plurality of battery cells 56 to the control circuit board 38. The lead plates 66 (see FIG. 6) are provided on the right and left sides of the battery cell module 36 and electrically connect the positive electrodes 58a and negative electrodes 58b of the plurality of battery cells 58 to the control circuit board 38.

[0045] As shown in FIG. 8, the fire extinguishing agents 40, 42 are attached to the flame retardant member 48, and the fire extinguishing agents 44, 46 are attached to the flame retardant member 50. The fire extinguishing agents 40, 42, 44, 46 contain components that have a negative catalytic effect on combustion. The fire extinguishing agents 40, 42, 44, 46 may contain, as components that have a negative catalytic effect on combustion, for example, components that absorb combustion gases such as hydrogen, hydrogen sulfide, carbon monoxide, methane, ethane, propane, and ethylene. Alternatively, the fire extinguishing agents 40, 42, 44, 46 may contain, as components that have a negative catalytic effect on combustion, components that generate sodium chloride, sodium carbonate, sodium sulfate, etc. during combustion to suppress the oxidation of combustibles. The fire extinguishing agents 40, 42, 44, 46 of this embodiment are obtained by compression molding a solid powder fire extinguishing agent into a thin plate shape. Note that the fire extinguishing agents 40, 42, 44, 46 may be those in which a gaseous or liquid fire extinguishing agent is enclosed in a thin film container.

[0046] The flame-retardant members 48 and 50 are materials that are difficult to burn, with a Limiting Oxygen Index greater than the oxygen concentration in the atmosphere. For example, the Limiting Oxygen Index of the flame-retardant members 48 and 50 may be, for example, 23 or more, 27 or more, or 40 or more. The flame-retardant members 48 and 50 are made of, for example, flame-retardant chloroprene rubber, and the Limiting Oxygen Index is, for example, 35. The Limiting Oxygen Index of the flame-retardant members 48 and 50 may be greater than the Limiting Oxygen Index of the casing 28 (for example, 23). The flame-retardant members 48 and 50 of this embodiment are formed in a thin plate shape. The flame-retardant member 48 includes a front portion 48a disposed opposite to the front surface of the battery cell module 34, a right portion 48b disposed opposite to the right surface of the battery cell module 34, and a left portion 48c disposed opposite to the left surface of the battery cell module 34. The fire extinguishing agent 40 is attached to the left surface and the upper surface of the right portion 48b of the flame-retardant member 48. The fire extinguishing agent 42 is attached to the right surface and the upper surface of the left portion 48c of the flame-retardant member 48. In this embodiment, the fire extinguishing agents 40 and 42 are adhered to the flame-retardant member 48 by adhesive tapes. The flame-retardant member 50 includes a front portion 50a disposed opposite to the front surface of the battery cell module 36, a right portion 50b disposed opposite to the right surface of the battery cell module 36, and a left portion 50c disposed opposite to the left surface of the battery cell module 36. The fire extinguishing agent 44 is attached to the left surface and the upper surface of the right portion 50b of the flame-retardant member 50. The fire extinguishing agent 46 is attached to the right surface and the upper surface of the left portion 50c of the flame-retardant member 50. In this embodiment, the fire extinguishing agents 44 and 46 are adhered to the flame-retardant member 50 by adhesive tapes.

[0047] As shown in FIG. 9, the front casing 22 includes a front plate 68 that faces the backpack 6 when the battery device 4 is attached to the backpack 6, a right outer plate 70 that extends rearward from the right end of the front plate 68, a left outer plate 72 that extends rearward from the left end of the front plate 68, an upper outer plate 74 that extends rearward from the upper end of the front plate 68, and a lower outer plate 76 that extends from the lower end of the front plate 68. The outer shape of the front casing 22 is defined by the front plate 68, the right outer plate 70, the left outer plate 72, the upper outer plate 74, and the lower outer plate 76. The front casing 22 further includes a right inner plate 78, a left inner plate 80, an upper inner plate 82, and a lower inner plate 84 that extend rearward from the rear surface of the front plate 68. The right inner plate 78, the left inner plate 80, the upper inner plate 82, and the lower inner plate 84, together with the inner cover 26 (see FIG. 4), define the accommodation chamber 30. The front casing 22 further includes a right central plate 86 and a left central plate 88 that extend rearward from the rear surface of the front plate 68, and a connecting plate 90 that connects the upper, rear, and lower ends of the right central plate 86 and the left central plate 88. The right central plate 86 extends rearward from the right edge of a vertically extending slit 68a (see FIG. 11) formed in the front plate 68, and the left central plate 88 extends rearward from the left edge of the slit 68a.

[0048] When the battery cell module 34 (see FIG. 6) is attached to the front casing 22, the battery cell module 34 is disposed on the right side of the right central plate 86 in the accommodation chamber 30. In this case, the front plate 68 faces the front surface of the battery cell module 34, the right inner plate 78 faces the right surface of the battery cell module 34, the right central plate 86 faces the left surface of the battery cell module 34, the upper inner plate 82 faces the upper surface of the battery cell module 34, and the lower inner plate 84 faces the lower surface of the battery cell module 34. When the battery cell module 36 (see FIG. 6) is attached to the front casing 22, the battery cell module 36 is disposed on the left side of the left central plate 88 in the accommodation chamber 30. In this case, the front plate 68 faces the front surface of the battery cell module 36, the left central plate 88 faces the right surface of the battery cell module 36, the left inner plate 80 faces the left surface of the battery cell module 36, the upper inner plate 82 faces the upper surface of the battery cell module 36, and the lower inner plate 84 faces the lower surface of the battery cell module 36.

[0049] On the rear surface of the front plate 68, lattice-shaped ribs 92 and 94 that project rearward and extend in the vertical and horizontal directions, fastening bosses 96 and 98 that project rearward, and positioning bosses 100 and 102 that project rearward are formed. The fastening bosses 96 and 98 and the positioning bosses 100 and 102 are arranged at the intersections of the lattice-shaped ribs 92 and 94. As shown in FIG. 8, in the front portion 48a of the flame-retardant member 48, a through hole 48d having a position and shape corresponding to the fastening boss 96 and a through hole 48e having a position and shape corresponding to the positioning boss 100 are formed. The flame-retardant member 48 is attached to the front casing 22 in a state where the fastening boss 96 penetrates the through hole 48d and the positioning boss 100 penetrates the through hole 48e. In the front portion 50a of the flame-retardant member 50, a through hole 50d having a position and shape corresponding to the fastening boss 98 and a through hole 50e having a position and shape corresponding to the positioning boss 102 are formed. The flame-retardant member 50 is attached to the front casing 22 in a state where the fastening boss 98 penetrates the through hole 50d and the positioning boss 102 penetrates the through hole 50e.

[0050] As shown in FIGS. 10 and 11, on the front surfaces of the cell holders 60 and 62 of the battery cell modules 34 and 36, there are formed screw bosses 104 and 106 protruding forward and positioning bosses 108 and 110 protruding forward. The screw bosses 104 and 106 are arranged corresponding to the fastening bosses 96 and 98 of the front casing 22, and the positioning bosses 108 and 110 are arranged corresponding to the positioning bosses 100 and 102 of the front casing 22. The outer diameter of the screw bosses 104 and 106 is slightly smaller than the inner diameter of the fastening bosses 96 and 98 of the front casing 22. The inner diameter of the positioning bosses 108 and 110 is slightly larger than the outer diameter of the positioning bosses 100 and 102 of the front casing 22. When attaching the battery cell modules 34 and 36 to the front casing 22, the screw bosses 104 and 106 of the cell holders 60 and 62 enter the fastening bosses 96 and 98 of the front plate 68, and the positioning bosses 108 and 110 of the front plate 68 enter the positioning bosses 100 and 102 of the cell holders 60 and 62, so that the cell holders 60 and 62 are positioned with respect to the front casing 22. On the front surface of the front casing 22, countersunk holes 112 and 114 are formed corresponding to the fastening bosses 96 and 98. Screws 116 and 118 are attached to the countersunk holes 112 and 114. The screws 116 and 118 pass through the front plate 68 of the front casing 22 and are screwed into the screw bosses 104 and 106 of the cell holders 60 and 62, so that the cell holders 60 and 62 are fixed to the front casing 22. In a state where the cell holders 60 and 62 are fixed to the front casing 22, the front portion 48a of the flame-retardant member 48 is clamped by the rib 92 of the cell holder 60 and the front casing 22, and the front portion 50a of the flame-retardant member 50 is clamped by the rib 94 of the cell holder 62 and the front casing 22.

[0051] Note that the fire extinguishing agents 40, 42, 44, and 46 do not have to be adhered to the flame retardant members 48, 50. Also, the flame retardant members 48, 50 do not have to be engaged with the fastening bosses 96, 98 or the positioning bosses 100, 102 of the front casing 22, nor do they have to be sandwiched between the front casing 22 and the cell holders 60, 62. For example, the fire extinguishing agents 40, 42, 44, 46 and / or the flame retardant members 48, 50 may be adhered to the cell holders 60, 62 with an adhesive tape, or may be adhered to the front casing 22 with an adhesive tape.

[0052] Due to improper handling of the battery device 4, a plurality of battery cells 56, 58 may catch fire and flames may occur from the positive electrodes 56a, 58a. In such a case, in the battery device 4 of this embodiment, the negative catalyst effect of the fire extinguishing agents 40, 42, 44, 46 extinguishes the flames of the plurality of battery cells 56, 58. According to the battery device 4 of this embodiment, even when a plurality of battery cells 56, 58 catch fire, it is possible to quickly extinguish the fire. Also, in the battery device 4 of this embodiment, since the accommodation chamber 30 that houses the plurality of battery cells 56, 58 and the fire extinguishing agents 40, 42, 44, 46 is sealed, when a plurality of battery cells 56, 58 catch fire, it is possible to suppress the components of the fire extinguishing agents 40, 42, 44, 46 from leaking out of the accommodation chamber 30. It is possible to quickly extinguish the flames of the plurality of battery cells 56, 58.

[0053] In the battery device 4 of this embodiment, between the positive electrode 56a of the battery cell 56 and the right inner plate 78 of the front casing 22, a fire extinguishing agent 40 and the right part 48b of the flame retardant member 48 are interposed, and between the positive electrode 56a of the battery cell 56 and the right center plate 86 of the front casing 22, a fire extinguishing agent 42 and the left part 48c of the flame retardant member 48 are interposed. Also, between the positive electrode 58a of the battery cell 58 and the left center plate 88 of the front casing 22, a fire extinguishing agent 44 and the right part 50b of the flame retardant member 50 are interposed, and between the positive electrode 58a of the battery cell 58 and the left inner plate 80 of the front casing 22, a fire extinguishing agent 46 and the left part 50c of the flame retardant member 50 are interposed. By adopting such a configuration, even when a flame ignited from a plurality of battery cells 56, 58 breaks through the fire extinguishing agents 40, 42, 44, 46, the flame is blocked by the flame retardant members 48, 50, so that it is possible to suppress the flame from reaching the right inner plate 78, the left inner plate 80, the right center plate 86, and the left center plate 88 of the front casing 22.

[0054] In the battery device 4 of this embodiment, the front parts 48a, 50a of the flame retardant members 48, 50 are interposed between the battery cell modules 34, 36 and the front plate 68 of the front casing 22. By adopting such a configuration, even when a plurality of battery cells 56, 58 are ignited, it is possible to suppress the flame from reaching the front plate 68 of the front casing 22, and it is possible to suppress damage to the backpack 6 of the backpack type power supply 2.

[0055] Incidentally, the fire extinguishing agents 40, 42, 44, and 46 may be sealed by a pair of laminate films that cover the front and back surfaces. In this case, the fire extinguishing agents 40, 42, 44, and 46 can be protected, and the handleability of the fire extinguishing agents 40, 42, 44, and 46 during the manufacture of the battery device 4 can be improved. Further, the flame retardant members 48 and 50 may be sealed by a pair of laminate films that cover the front and back surfaces. In this case, the flame retardant members 48 and 50 can be protected, and the handleability of the flame retardant members 48 and 50 during the manufacture of the battery device 4 can be improved. Further, the fire extinguishing agents 40, 42, 44, and 46 may be adhered to the flame retardant members 48 and 50 with an adhesive, and the flame retardant members 48 and 50 and the fire extinguishing agents 40, 42, 44, and 46 together may be sealed by a pair of laminate films that cover the front and back surfaces. The above-described laminate film may be made of, for example, polyethylene terephthalate.

[0056] As described above, in one or more embodiments, the battery device 4 includes battery cells 56 and 58, fire extinguishing agents 40, 42, 44, and 46 that include components having a negative catalytic effect on combustion, flame retardant members 48 and 50 having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing 28 that houses the battery cells 56 and 58, the fire extinguishing agents 40, 42, 44, and 46, and the flame retardant members 48 and 50. The fire extinguishing agents 40, 42, 44, and 46 are interposed between the battery cells 56 and 58 and the casing 28. The flame retardant members 48 and 50 are interposed between the fire extinguishing agents 40, 42, 44, and 46 and the casing 28.

[0057] According to the above configuration, when the battery cells 56 and 58 are ignited due to improper handling, the negative catalytic effect of the fire extinguishing agents 40, 42, 44, and 46 enables rapid extinguishing of the fire. Further, according to the above configuration, even when the flame ignited from the battery cells 56 and 58 in the battery device 4 breaks through the fire extinguishing agents 40, 42, 44, and 46, the flame retardant members 48 and 50 block the flame, so that it is possible to suppress the flame from reaching the casing 28.

[0058] In one or more embodiments, the battery cells 56, 58 have a substantially cylindrical shape. The fire extinguishing agents 40, 42, 44, 46 and the flame retardant members 48, 50 are interposed between the longitudinal end faces of the battery cells 56, 58 and the casing 28.

[0059] When the battery cells 56, 58 having a substantially cylindrical shape catch fire, flames often extend from the end faces of the battery cells 56, 58. According to the above configuration, when the battery cells 56, 58 catch fire, the fire extinguishing agents 40, 42, 44, 46 are likely to be exposed to the flames, and the negative catalytic effect can be quickly exerted. When the battery cells 56, 58 catch fire due to improper handling, they can be quickly extinguished. Further, according to the above configuration, even when the flames extending from the end faces of the battery cells 56, 58 break through the fire extinguishing agents 40, 42, 44, 46, the flames are blocked by the flame retardant members 48, 50, so that it is possible to suppress the flames from reaching the casing 28.

[0060] In one or more embodiments, the battery device 4 further includes cell holders 60, 62 that hold the battery cells 56, 58. The battery cells 56, 58 are held by the cell holders 60, 62 such that the longitudinal end faces are exposed on the side faces of the cell holders 60, 62. The flame retardant members 48, 50 cover the entire side faces of the cell holders 60, 62.

[0061] According to the above configuration, since the flame retardant members 48, 50 cover the entire side faces of the cell holders 60, 62 where the end faces of the battery cells 56, 58 are exposed, it is possible to suppress the flames extending from the end faces of the battery cells 56, 58 from reaching the casing 28.

[0062] In one or more embodiments, the flame retardant members 48, 50 are sandwiched between the cell holders 60, 62 and the casing 28.

[0063] According to the above configuration, when carrying and using the battery device 4, it is possible to prevent the positions of the flame retardant members 48, 50 from shifting.

[0064] In one or more embodiments, the casing 28 is detachable from the backpack 6 to which the shoulder belt 8 is attached. The flame retardant members 48, 50 are interposed between the portion of the casing 28 facing the backpack 6 and the battery cells 56, 58.

[0065] According to the above configuration, when the battery cells 56, 58 catch fire due to improper handling, it is possible to suppress the flame from reaching the portion of the casing 28 facing the backpack 6.

[0066] In one or more embodiments, the flame retardant members 48, 50 are engaged with the casing 28.

[0067] According to the above configuration, when carrying and using the battery device 4, it is possible to prevent the positions of the flame retardant members 48, 50 from shifting.

[0068] In one or more embodiments, the casing 28 has fastening bosses 96, 98 and positioning bosses 100, 102 (examples of bosses) that protrude inward from the inner surface of the casing 28. The flame retardant members 48, 50 have through holes 48d, 50d, 48e, 50e corresponding to the fastening bosses 96, 98 and the positioning bosses 100, 102. The flame retardant members 48, 50 are engaged with the casing 28 by the insertion of the fastening bosses 96, 98 and the positioning bosses 100, 102 into the through holes 48d, 50d, 48e, 50e.

[0069] According to the above configuration, the flame retardant members 48, 50 can be engaged with the casing 28 by using the fastening bosses 96, 98 and the positioning bosses 100, 102 provided on the casing 28.

[0070] In one or more embodiments, the flame retardant members 48, 50 are adhered to the casing 28.

[0071] According to the above configuration, when carrying and using the battery device 4, it is possible to suppress the displacement of the positions of the flame-retardant members 48 and 50 with respect to the casing 28.

[0072] In one or more embodiments, the flame-retardant members 48 and 50 are adhered to the fire extinguishing agents 40, 42, 44, and 46.

[0073] According to the above configuration, when carrying and using the battery device 4, it is possible to suppress the displacement of the positions of the flame-retardant members 48 and 50 with respect to the fire extinguishing agents 40, 42, 44, and 46.

[0074] In one or more embodiments, the battery device 4 further includes a laminate film (an example of a protective member) that covers the flame-retardant members 48 and 50.

[0075] According to the above configuration, even when the battery device 4 is impacted or water enters the inside of the battery device 4, the flame-retardant members 48 and 50 can be protected.

[0076] In one or more embodiments, the laminate film covers the flame-retardant members 48 and 50 and the fire extinguishing agents 40, 42, 44, and 46 together.

[0077] According to the above configuration, even when the battery device 4 is impacted or water enters the inside of the battery device 4, the flame-retardant members 48 and 50 and the fire extinguishing agents 40, 42, 44, and 46 can be protected.

[0078] In one or more embodiments, the battery cells 56 and 58 are charged at a State of Charge (SOC) of 90% or more.

[0079] When the state of charge (SOC) of battery cells 56 and 58 is high, there is a risk of intense combustion when the battery cells 56 and 58 catch fire. According to the above configuration, when the battery cells 56 and 58 are inappropriately handled and catch fire, it is possible to suppress intense combustion. Also, even when the battery cells 56 and 58 catch fire, it is possible to suppress the flame from reaching the casing 28.

[0080] In one or more embodiments, the energy density of the battery cells 56 and 58 is 300 Wh / liter or more.

[0081] When the energy density of the battery cells 56 and 58 is high, there is a risk of intense combustion when the battery cells 56 and 58 catch fire. According to the above configuration, when the battery cells 56 and 58 are inappropriately handled and catch fire, it is possible to suppress intense combustion. Also, even when the battery cells 56 and 58 catch fire, it is possible to suppress the flame from reaching the casing 28.

[0082] In one or more embodiments, the battery cells 56 and 58 include lithium-ion battery cells.

[0083] Lithium-ion battery cells have a higher risk of catching fire due to various causes compared to other types of battery cells. According to the above configuration, even when the lithium-ion battery cells are inappropriately handled and catch fire, they can be quickly extinguished. Also, even when the lithium-ion battery cells catch fire, it is possible to suppress the flame from reaching the casing 28.

[0084] (Example 2) The battery pack 202 of the present embodiment shown in FIG. 12 is used by being attached to the battery pack attachment portion 52a of the electric working machine 52 (see FIG. 3). The electric working machine 52 may be a blower as shown in FIG. 3, may be other electric working machines such as a lawn mower or a chain saw, or may be a so-called electric tool such as a driver or a drill. The battery pack 202 is detachable from the electric working machine 52 by sliding it in a predetermined slide direction with respect to the electric working machine 52. Hereinafter, the direction in which the battery pack 202 is slid when attaching the battery pack 202 to the electric working machine 52 is referred to as the rear direction, and the direction in which the battery pack 202 is slid when removing the battery pack 202 from the electric working machine 52 is referred to as the front direction. Also, in a state where the battery pack 202 is attached to the electric working machine 52, the direction in which the electric working machine 52 is located when viewed from the battery pack 202 is referred to as the upward direction, and the direction opposite to the upward direction is referred to as the downward direction. Further, the direction orthogonal to the front-rear direction and the up-down direction is referred to as the left-right direction.

[0085] As shown in FIG. 12, the battery pack 202 includes a lower casing 204 and an upper casing 206. Both the lower casing 204 and the upper casing 206 are members made of resin (for example, polycarbonate). Hereinafter, the lower casing 204 and the upper casing 206 are collectively referred to simply as the casing 208. The upper casing 206 is fixed to the lower casing 204 by a fastener.

[0086] As shown in FIG. 11, inside the casing 208, a battery cell module 210, a control circuit board 212, fire extinguishing agents 214, 216, and a flame retardant member 218 are accommodated.

[0087] The battery cell module 210 includes a plurality of battery cells 222 (see FIG. 14), a cell holder 224 made of resin (for example, polycarbonate) that holds the plurality of battery cells 222, and a lead plate 226 that electrically connects the plurality of battery cells 222 to the control circuit board 212. The control circuit board 212 is fixed to the upper surface of the cell holder 224 by a fastener. The control circuit board 212 is, for example, a glass epoxy board.

[0088] As shown in FIG. 14, each of the plurality of battery cells 222 is a secondary battery cell having, for example, a substantially cylindrical shape, and is, for example, a lithium-ion battery cell. Each of the plurality of battery cells 222 has, for example, a cell shape of 18650 type, a volumetric energy density of 653 Wh / liter, a rated capacity of 3 Ah, and a rated voltage of 3.6 V. Note that each of the plurality of battery cells 222 may have a volumetric energy density of 327 Wh / liter and a rated capacity of 1.5 Ah. Alternatively, each of the plurality of battery cells 222 may have a volumetric energy density of 436 Wh / liter and a rated capacity of 2 Ah. Alternatively, each of the plurality of battery cells 222 may have a volumetric energy density of 544 Wh / liter and a rated capacity of 2.5 Ah. Alternatively, each of the plurality of battery cells 222 may have a volumetric energy density of 653 Wh / liter and a rated capacity of 3 Ah. Alternatively, each of the plurality of battery cells 222 may have a cell shape of 21700 type, a volumetric energy density of 594 Wh / liter, a rated capacity of 4 Ah, and a rated voltage of 3.6 V. Note that each of the plurality of battery cells 222 is not limited to a substantially cylindrical shape, and may be a so-called square type or a laminate type. The battery pack 202 is such that each of the plurality of battery cells 222 is charged at a State of Charge (SOC) of 90% or more. Each of the plurality of battery cells 222 includes a positive electrode 222a and a negative electrode 222b as electrodes. The positive electrode 222a is disposed on one end face in the longitudinal direction of the battery cell 222, and the negative electrode 222b is disposed on the other end face in the longitudinal direction of the battery cell 222. The plurality of battery cells 222 are arranged side by side in the front-rear direction and the up-down direction such that the longitudinal direction is along the left-right direction. In the present embodiment, the battery cell module 210 includes a total of 10 battery cells 222 arranged in 2 rows in the up-down direction and 5 rows in the front-rear direction. Some of the plurality of battery cells 222 are held by a cell holder 224 such that the positive electrode 222a is exposed on the right surface of the cell holder 224 and the negative electrode 222b is exposed on the left surface of the cell holder 224.Of the plurality of battery cells 222, the remainder are held by the cell holder 224 such that the positive electrode 222a is exposed on the left side surface of the cell holder 224 and the negative electrode 222b is exposed on the right side surface of the cell holder 224. As shown in FIG. 13, the lead plates 226 are provided on the right and left side surfaces of the battery cell module 210 and electrically connect the positive electrodes 222a and the negative electrodes 222b of the plurality of battery cells 222 to the control circuit board 212.

[0089] The fire extinguishing agents 214 and 216 are the same as the fire extinguishing agents 40, 42, 44, and 46 of the first embodiment. The flame retardant member 218 is the same as the flame retardant members 48 and 50 of the first embodiment. The flame retardant member 218 includes a lower portion 218a disposed opposite to the lower surface of the battery cell module 210, a right portion 218b disposed opposite to the right side surface of the battery cell module 210, and a left portion 218c disposed opposite to the left side surface of the battery cell module 210. The fire extinguishing agent 214 is attached to the left side surface of the right portion 218b of the flame retardant member 218. The fire extinguishing agent 216 is attached to the right side surface of the left portion 220b of the flame retardant member 218. In this embodiment, the fire extinguishing agents 214 and 216 are adhered to the flame retardant member 218 by an adhesive tape.

[0090] The lower casing 204 includes a lower plate 228, a right plate 230 extending upward from the right end of the lower plate 228, a left plate 232 extending upward from the left end of the lower plate 228, a front plate 234 extending upward from the front end of the lower plate 228, and a rear plate 236 extending upward from the rear end of the lower plate 228. The outer shape of the lower casing 204 is defined by the lower plate 228, the right plate 230, the left plate 232, the front plate 234, and the rear plate 236.

[0091] When the battery cell module 210 is attached to the lower casing 204, the lower plate 228 faces the lower surface of the battery cell module 210, the right plate 230 faces the right surface of the battery cell module 210, the left plate 232 faces the left surface of the battery cell module 210, the front plate 234 faces the front surface of the battery cell module 210, and the rear plate 236 faces the rear surface of the battery cell module 210. When the battery cell module 210 is attached to the lower casing 204, the lower portion 218a of the flame retardant member 218 is sandwiched between the cell holder 224 and the lower plate 228 of the lower casing 204.

[0092] Note that the fire extinguishing agents 214 and 216 do not have to be attached to the flame retardant member 218. The flame retardant member 218 does not have to be sandwiched between the lower casing 204 and the cell holder 224. For example, the fire extinguishing agents 214 and 216 and / or the flame retardant member 218 may be attached to the cell holder 224 with an adhesive tape, or may be attached to the lower casing 204 with an adhesive tape.

[0093] Due to improper handling of the battery pack 202, a plurality of battery cells 222 may catch fire and a flame may occur from the positive electrode 222a. In such a case, in the battery pack 202 of this embodiment, the flame of the plurality of battery cells 222 is extinguished by the negative catalyst effect of the fire extinguishing agents 214 and 216. According to the battery pack 202 of this embodiment, even when a plurality of battery cells 222 catch fire, it is possible to quickly extinguish the fire.

[0094] In the battery pack 202 of this embodiment, between the positive electrode 222a of the battery cell 222 and the right plate 230 of the lower casing 204, the fire extinguishing agent 214 and the right portion 218b of the flame retardant member 218 are interposed, and between the positive electrode 222a of the battery cell 222 and the left plate 232 of the lower casing 204, the fire extinguishing agent 216 and the left portion 218c of the flame retardant member 218 are interposed. By adopting such a configuration, even when the flame ignited from a plurality of battery cells 222 breaks through the fire extinguishing agents 214 and 216, the flame is blocked by the flame retardant member 218, so that it is possible to suppress the flame from reaching the right plate 230 and the left plate 232 of the lower casing 204.

[0095] In addition, the fire extinguishing agents 214 and 216 and the flame retardant members 218 of this embodiment may also be sealed by a pair of laminate films that cover the front and back surfaces, similar to the fire extinguishing agents 40, 42, 44, 46 and the flame retardant members 48, 50 of Embodiment 1.

[0096] As described above, in one or more embodiments, the battery pack 202 (an example of a battery device) includes a battery cell 222, fire extinguishing agents 214 and 216 containing components that have a negative catalytic effect on combustion, a flame retardant member 218 having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing 208 that houses the battery cell 222, the fire extinguishing agents 214 and 216, and the flame retardant member 218. The fire extinguishing agents 214 and 216 are interposed between the battery cell 222 and the casing 208. The flame retardant member 218 is interposed between the fire extinguishing agents 214 and 216 and the casing 208.

[0097] According to the above configuration, when the battery cell 222 catches fire due to improper handling, it can be quickly extinguished by the negative catalytic effect of the fire extinguishing agents 214 and 216. Further, according to the above configuration, even when the flame ignited from the battery cell 222 breaks through the fire extinguishing agents 214 and 216 in the battery pack 202, the flame can be blocked by the flame retardant member 218, so that it is possible to suppress the flame from reaching the casing 208.

[0098] In one or more embodiments, the battery cell 222 has a substantially cylindrical shape. The fire extinguishing agents 214 and 216 and the flame retardant member 218 are interposed between the longitudinal end faces of the battery cell 222 and the casing 208.

[0099] When the battery cell 222 having a slightly cylindrical shape catches fire, flames often extend from the end face of the battery cell 222. According to the above configuration, when the battery cell 222 catches fire, the fire extinguishing agents 214 and 216 are likely to be exposed to the flames, and the negative catalytic effect can be quickly exerted. When the battery cell 222 catches fire due to improper handling, it can be quickly extinguished. Further, according to the above configuration, even when the flames extending from the end face of the battery cell 222 break through the fire extinguishing agents 214 and 216, the flame is blocked by the flame retardant member 218, so that it is possible to suppress the flame from reaching the casing 208.

[0100] In one or more embodiments, the battery pack 202 further includes a cell holder 224 that holds the battery cell 222. The battery cell 222 is held by the cell holder 224 such that the longitudinal end face is exposed on the side surface of the cell holder 224. The flame retardant member 218 covers the entire side surface of the cell holder 224.

[0101] According to the above configuration, since the flame retardant member 218 covers the entire side surface of the cell holder 224 where the end face of the battery cell 222 is exposed, it is possible to suppress the flame extending from the end face of the battery cell 222 from reaching the casing 208.

[0102] In one or more embodiments, the flame retardant member 218 is sandwiched between the cell holder 224 and the casing 208.

[0103] According to the above configuration, when carrying and using the battery pack 202, it is possible to prevent the position of the flame retardant member 218 from shifting.

[0104] In one or more embodiments, the flame retardant member 218 is adhered to the casing 208.

[0105] According to the above configuration, when carrying and using the battery pack 202, it is possible to prevent the position of the flame retardant member 218 relative to the casing 208 from shifting.

[0106] In one or more embodiments, the flame retardant member 218 is attached to the fire extinguishing agents 214, 216.

[0107] According to the above configuration, when carrying and using the battery pack 202, it is possible to suppress the displacement of the position of the flame retardant member 218 with respect to the fire extinguishing agents 214, 216.

[0108] In one or more embodiments, the battery pack 202 further includes a laminate film (an example of a protective member) that covers the flame retardant member 218.

[0109] According to the above configuration, even when an impact is applied to the battery pack 202 or water enters the inside of the battery pack 202, the flame retardant member 218 can be protected.

[0110] In one or more embodiments, the laminate film covers the flame retardant member 218 and the fire extinguishing agents 214, 216 together.

[0111] According to the above configuration, even when an impact is applied to the battery pack 202 or water enters the inside of the battery pack 202, the flame retardant member 218 and the fire extinguishing agents 214, 216 can be protected.

[0112] In one or more embodiments, the battery cell 222 is charged with a State of Charge (SOC) of 90% or more.

[0113] When the SOC of the battery cell 222 is high, there is a risk of intense burning when the battery cell 222 catches fire. According to the above configuration, it is possible to suppress intense burning when the battery cell 222 catches fire due to improper handling. Further, even when the battery cell 222 catches fire, it is possible to suppress the flame from reaching the casing 208.

[0114] In one or more embodiments, the energy density of the battery cell 222 is 300 Wh / liter or more.

[0115] When the energy density of the battery cell 222 is high, there is a risk of intense combustion when the battery cell 222 catches fire. According to the above configuration, it is possible to suppress intense combustion when the battery cell 222 catches fire due to improper handling. Further, even when the battery cell 222 catches fire, it is possible to suppress the flame from reaching the casing 208.

[0116] In one or more embodiments, the battery cell 222 includes a lithium-ion battery cell.

[0117] Lithium-ion battery cells have a higher risk of catching fire due to various causes compared to other types of battery cells. According to the above configuration, even when the lithium-ion battery cell catches fire due to improper handling, it is possible to extinguish the fire promptly. Further, even when the lithium-ion battery cell catches fire, it is possible to suppress the flame from reaching the casing.

Explanation of Reference Numerals

[0118] 2: Backpack power source 4: Battery device 6: Backpack 8: Shoulder strap 10: Waist belt 12: Charging plug 14: Discharge cable 16: Discharge plug 18: Remaining amount display lamp 20: Remaining amount display button 22: Front casing 24: Rear casing 26: Inner cover 28: Casing 30: Accommodation chamber 34: Battery cell module 36: Battery cell module 38: Control circuit board 40: Fire extinguishing agent 42: Fire extinguishing agent 44: Fire extinguishing agent 46: Fire extinguishing agent 48: Flame-retardant member 48a: Front part 48b: Right part 48c: Left part 48d: Through hole 48e: Through hole 50: Flame-retardant member 50a: Front part 50b: Right part 50c: Left part 50d: Through hole 50e: Through hole 52: Electric power tool 52a: Battery pack mounting part 54: Adapter 56: Battery cell 56a: Positive electrode 56b: Negative electrode 58: Battery cell 58a: Positive electrode 58b: Negative electrode 60: Cell holder 62: Cell holder 64: Lead plate 66: Lead plate 68: Front plate 68a: Slit 70: Right outer plate 72: Left outer plate 74: Upper outer plate 76: Lower outer plate 78: Right inner plate 80: Left inner plate 82: Upper inner plate 84: Lower inner plate 86: Right center plate 88: Left center plate 90: Connecting plate 92: Rib 94: Rib 96: Fastening boss 98: Fastening boss 100: Positioning boss 102: Positioning boss 104: Screw boss 106: Screw boss 108: Positioning boss 110: Positioning boss 112: Counterbore hole 114: Counterbore hole 116: Screw 118: Screw 202: Battery pack 204: Lower casing 206: Upper casing 208: Casing 210: Battery cell module 212: Control circuit board 214: Fire extinguishing agent 216: Fire extinguishing agent 218: Flame retardant member 218a: Lower part 218b: Right part 218c: Left part 220b: Left part 222: Battery cell 222a: Positive electrode 222b: Negative electrode 224: Cell holder 226: Lead plate 228: Bottom plate 230: Right plate 232: Left plate 234: Front plate 236: Rear plate

Claims

1. A battery device, comprising a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, a flame-retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame-retardant member, wherein the fire extinguishing agent is interposed between the battery cell and the casing, and the flame-retardant member is interposed between the fire extinguishing agent and the casing, wherein the battery cell has a substantially cylindrical shape, and the fire extinguishing agent and the flame-retardant member are interposed between an end face in the longitudinal direction of the battery cell and the casing, wherein the battery device further comprises a cell holder for holding the battery cell, wherein the battery cell is held by the cell holder such that the end face in the longitudinal direction is exposed on a side surface of the cell holder, and the flame-retardant member covers the entire side surface of the cell holder, A battery device.

2. The battery device according to claim 1, wherein the flame-retardant member is sandwiched between the cell holder and the casing.

3. A battery device, comprising a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, a flame-retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame-retardant member, wherein the fire extinguishing agent is interposed between the battery cell and the casing, and the flame-retardant member is interposed between the fire extinguishing agent and the casing, The casing is detachable from the backpack to which the shoulder belt is attached. The flame retardant member is interposed between a portion of the casing facing the backpack and the battery cell. Battery device.

4. A battery device, A battery cell, A fire extinguishing agent containing a component that provides a negative catalytic effect on combustion, A flame retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, It includes a resin casing that houses the battery cell, the fire extinguishing agent, and the flame retardant member, The fire extinguishing agent is interposed between the battery cell and the casing, The flame retardant member is interposed between the fire extinguishing agent and the casing. The flame retardant member is engaged with the casing. Battery device.

5. The casing has a boss that protrudes inward from the inner surface of the casing, The flame retardant member has a through hole corresponding to the boss, The battery device according to claim 4, wherein the boss enters the through hole, whereby the flame retardant member is engaged with the casing.

6. A battery device, A battery cell, A fire extinguishing agent containing a component that provides a negative catalytic effect on combustion, A flame retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, It includes a resin casing that houses the battery cell, the fire extinguishing agent, and the flame retardant member, The fire extinguishing agent is interposed between the battery cell and the casing, The flame retardant member is interposed between the fire extinguishing agent and the casing. The flame retardant member is adhered to the casing. Battery device.

7. A battery device, a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, a flame retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame retardant member, the fire extinguishing agent is interposed between the battery cell and the casing, the flame retardant member is interposed between the fire extinguishing agent and the casing, the flame retardant member is adhered to the fire extinguishing agent. Battery device.

8. A battery device, a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, a flame retardant member having a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame retardant member, the fire extinguishing agent is interposed between the battery cell and the casing, the flame retardant member is interposed between the fire extinguishing agent and the casing, the battery device further includes a protective member that covers the flame retardant member. Battery device.

9. The battery device according to claim 8, wherein the protective member covers the flame retardant member and the fire extinguishing agent together.

10. A battery device, a battery cell, a fire extinguishing agent containing a component that has a negative catalytic effect on combustion, A flame-retardant member with a limiting oxygen index greater than the oxygen concentration in the atmosphere, and a resin casing that houses the battery cell, the fire extinguishing agent, and the flame-retardant member, wherein the fire extinguishing agent is interposed between the battery cell and the casing, wherein the flame-retardant member is interposed between the fire extinguishing agent and the casing, wherein the battery cell has a substantially cylindrical shape, wherein the fire extinguishing agent and the flame-retardant member are interposed between the longitudinal end face of the battery cell and the casing, wherein the flame-retardant member covers the entire battery cell when viewed along the longitudinal direction of the battery cell, A battery device.

11. A battery device, comprising: a battery cell; a lead plate electrically connected to the battery cell; a fire extinguishing agent containing a component that has a negative catalytic effect on combustion; a flame-retardant member with a limiting oxygen index greater than the oxygen concentration in the atmosphere; a resin casing that houses the battery cell, the fire extinguishing agent, and the flame-retardant member; wherein the fire extinguishing agent is interposed between the battery cell and the casing; wherein the flame-retardant member is interposed between the fire extinguishing agent and the casing; wherein the lead plate is interposed between the fire extinguishing agent and the battery cell, A battery device.

12. The battery device according to any one of claims 1 to 11, wherein the battery cell is charged at a state of charge (SOC) of 90% or more.

13. The battery device according to any one of claims 1 to 12, wherein the energy density of the battery cell is 300 Wh / liter or more.

14. The battery device according to any one of claims 1 to 13, wherein the battery cell includes a lithium ion battery cell.

Images