JP2018018659A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack that is able to control flow of gas coming out from the interior of a housing.SOLUTION: A battery pack 10 comprises: a battery module 20; a housing 40 for housing the battery module 20; and a plate-like lid body 50 for closing openings A1, A2 provided in the housing 40. The lid body 50 has: a fixed part 51 fixed to the housing 40; and extending parts 52, 53 extending from the fixed part 51 to peripheral edge portions R2 to R5 of the openings A1, A2. The extending parts 52, 53 are deformed so as to separate from the peripheral edge portions R2 to R5 from the fixed part 51 as a start point according to an increase in pressure in the housing 40, thereby uncovering the openings A1, A2. The housing 40 has an upper surface 47 provided with a recessed part 40b recessed to inside of the housing 40. The receding part 40b has an area 44b, an internal face 43s and one side face 48. The openings A1, A2 are provided in the area 44b.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a battery pack.

  Patent Document 1 describes a battery pack having a case for housing a battery module. The case of the battery pack described in Patent Document 1 is provided with a through hole that allows the inside of the case to communicate with the outside. The through-hole is provided with a pressure release valve that opens when the pressure inside the case exceeds a specified pressure. The pressure release valve functions as a so-called safety valve that prevents the pressure in the case from rising abnormally.

JP 2014-154240 A

  A battery pack is accommodated in the battery accommodating part of a vehicle as a battery, for example. In the battery pack described above, when the pressure release valve breaks, the flow of gas discharged from the inside of the case through the through hole cannot be controlled (regulated). For this reason, there is a possibility that the gas ejected from the inside of the case flows out directly from, for example, an opening for charging provided in the battery housing portion.

  The present invention provides a battery pack capable of controlling the flow of gas discharged from the inside of the housing to the outside.

  A battery pack according to one aspect of the present invention includes a battery module, a housing that houses the battery module, and a plate-like lid that closes an opening provided in the housing, and the lid includes a housing. And an extending portion extending from the fixing portion so as to reach the peripheral edge portion of the opening. The extending portion starts from the fixing portion in accordance with an increase in pressure in the housing. The opening is opened by being deformed so as to be separated from the peripheral portion, and the housing has a first side surface provided with a first recess recessed toward the inside of the housing, and the first recess has a bottom surface and And an inner wall surface connecting the bottom surface and the first side surface, and the opening is provided in the bottom surface.

  In this battery pack, the extension part of the lid body is deformed so as to be separated from the peripheral part from the fixed part as the pressure in the housing increases, thereby opening the opening. Thereby, a cover body functions as what is called a safety valve which prevents that the pressure in a housing | casing raises abnormally. The gas discharged to the outside from the inside of the casing flows out in a direction spreading around the opening from the gap between the peripheral edge portion and the extending portion. The opening is provided on the bottom surface of the first recess provided on the first side surface of the housing. For this reason, it is possible to control the flow of gas discharged from the inside of the housing through the opening to the inner wall surface of the first recess.

  In the battery pack according to one aspect of the present invention, the housing may have a second side surface facing the side opposite to the inner wall surface, and a charging connector may be provided on the second side surface. In this case, since the charging connector is provided on the second side surface, if the battery pack is accommodated in the battery accommodating portion of the vehicle so that the second side surface is on the near side, charging is performed from the opening provided in the battery accommodating portion. The connector can be accessed. At this time, the gas flowing out from the opening on the first side surface is controlled by the inner wall surface on the opposite side of the second side surface, and thus does not directly reach the opening for charging. Therefore, the gas flowing out from the opening on the first side surface is prevented from flowing directly out of the charging opening.

  In the battery pack according to one aspect of the present invention, the first side surface may be provided with a second recess that is recessed toward the inside of the housing, and the second recess may be provided with an external component. In this case, since the external component is provided in the second recess, the flow of gas discharged from the opening provided in the bottom surface of the first recess does not directly hit the external component. Thereby, the influence which the gas discharged | emitted from the inside of a housing | casing has on an external component can be suppressed. Examples of the external parts include a connector connected to the battery module, a connector connected to a control unit that controls the battery module, and the like.

  In the battery pack according to one aspect of the present invention, the extending portion has one end connected to the fixed portion and the other end positioned on the opposite side of the one end, and the other end faces the inner wall surface. May be. In this case, since the extending part is deformed so as to be separated from the peripheral part starting from the fixed part, the extended part is located at the other end located on the opposite side of the one end than the one end connected to the fixed part. However, it is far away from the peripheral edge. For this reason, the gas in a housing | casing tends to flow out from the other end side of an extension part. Since the other end of the extending portion faces the inner wall surface of the first recess, the gas flow flowing out from the inside of the casing reliably hits the inner wall surface. For this reason, the flow of the gas flowing out from the inside of the housing can be reliably controlled.

  A battery pack according to one aspect of the present invention includes a battery module, a housing that houses the battery module, and a plate-like lid that closes an opening provided in the housing, and the lid includes a housing. And an extending portion extending from the fixing portion so as to reach the peripheral edge portion of the opening. The extending portion starts from the fixing portion in accordance with an increase in pressure in the housing. The opening is opened by being deformed so as to be separated from the peripheral portion, and the housing has a third side surface provided with the opening and a wall portion standing on the third side surface.

  In this battery pack, the extension part of the lid body is deformed so as to be separated from the peripheral part from the fixed part as the pressure in the housing increases, thereby opening the opening. Thereby, a cover body functions as what is called a safety valve which prevents that the pressure in a housing | casing raises abnormally. The gas discharged to the outside from the inside of the casing flows out in a direction spreading around the opening from the gap between the peripheral edge portion and the extending portion. The opening is provided on the third side surface of the housing, and a wall portion is erected on the third side surface. For this reason, the flow of the gas discharged | emitted outside through the opening from the inside of a housing | casing can be controlled by applying to a wall part.

  ADVANTAGE OF THE INVENTION According to this invention, the battery pack which can control the flow of the gas which flows out out of the inside of a housing | casing can be provided.

It is a side view which shows the reach lift in which the battery pack which concerns on embodiment is mounted. It is a schematic cross section along the II-II line of FIG. It is a perspective view of the battery pack shown by FIG. It is a side view of the battery pack shown by FIG. FIG. 2 is a top view of the battery pack shown in FIG. 1. FIG. 2 is a partially exploded perspective view of the battery pack shown in FIG. 1. It is a schematic diagram which shows the state which the extension part deform | transformed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted.

  The battery pack according to the present embodiment is mounted on a vehicle. The vehicle is, for example, an industrial vehicle. An example of the industrial vehicle is a forklift that performs a cargo handling operation. Here, a reach lift is illustrated as an example of a forklift. FIG. 1 is a side view showing a reach lift. As shown in FIG. 1, the reach lift 1 includes a vehicle body 2, a cargo handling device 3, and a cab 4. The reach lift 1 is a compact forklift that a driver stands and operates.

  Therefore, the vehicle body 2 of the reach lift 1 is smaller than the vehicle body of the counter-type forklift. In particular, the size of the vehicle body 2 in the front-rear direction is relatively small. In the following description, “front”, “rear”, “left”, and “right” may indicate directions when the direction from the cab 4 toward the cargo handling device 3 is the “front” direction. is there. Further, “upper” and “lower” in the following description may indicate a vertically upward direction and a vertically downward direction, respectively.

  The vehicle body 2 includes a pedestal portion 2a and a main body portion 2b. The pedestal portion 2 a is disposed at the lower part of the vehicle body 2. The pedestal portion 2a has a rectangular parallelepiped shape, for example. A rear wheel (drive wheel and steering wheel) 2c and a caster wheel (not shown) are provided in the lower rear portion of the pedestal portion 2a. The rear right part on the upper surface of the pedestal part 2a is a floor on which the driver stands.

  The main body 2b is disposed on the top of the pedestal 2a. The main body 2b is substantially L-shaped in plan view. The inside of the main body 2b is a storage space (battery storage portion) Hs for various devices. The front portion of the accommodation space Hs is a space that extends over substantially the entire region of the reach lift 1 in the left-right direction (vehicle width direction). The rear portion of the accommodation space Hs is a space that extends over a substantially left half region of the reach lift 1 in the left-right direction. A traveling motor 2d and a cargo handling motor 2e are disposed on the upper side of the rear portion of the accommodation space Hs. The traveling motor 2d is a motor that is a drive source of the drive wheels. The cargo handling motor 2 e is a motor that is a drive source of the cargo handling device 3.

  FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. As shown in FIG. 2, the battery pack 10 is accommodated in the front portion of the accommodation space Hs. The left side surface 2s of the vehicle body 2 is provided with a lid 2h that can be opened and closed with respect to an opening 2p for inserting the battery pack 10 into the accommodation space Hs. Here, the opening 2p is also used as a charging opening for accessing a charging connector 80 described later when the battery pack 10 is charged. The battery pack 10 serves as a power source for the traveling motor 2d and the cargo handling motor 2e. The battery pack 10 is housed in the housing space Hs so that a side surface 45 provided with a charging connector 80 to be described later is in front of the side surface 2s.

  As shown in FIG. 1, the cargo handling device 3 has a pair of left and right reach legs 3a, a fork 3b, and a mast 3c. The reach leg 3a is provided forward from the front end of the pedestal 2a. A front wheel 3d is provided at the lower front part of each reach leg 3a. The mast 3c is erected in front of the main body 2b. The mast 3c is attached to a pair of left and right reach legs 3a so as to be movable in the front-rear direction. The mast 3c is movable in the front-rear direction along a pair of left and right reach legs 3a by a driving force of a reach cylinder (not shown).

  The fork 3b is attached to the mast 3c via a lift bracket 3e. The fork 3b is a member for supporting the load A. The fork 3b is movable in the vertical direction along the mast 3c by a driving force of a lift cylinder (not shown) coupled to the mast 3c. In the cab 4, a vacant space on the right side of the rear part of the vehicle body 2 is the floor. The cab 4 is provided with a handle 4a on the left side of the floor.

  Then, with reference to FIGS. 3-7, the battery pack 10 which concerns on embodiment is demonstrated. FIG. 3 is a perspective view of the battery pack shown in FIG. FIG. 4 is a side view of the battery pack shown in FIG. FIG. 5 is a top view of the battery pack shown in FIG. 6 is a partially exploded perspective view of the battery pack shown in FIG. FIG. 7 is a schematic diagram showing a state in which the extending portion is deformed. In the following, the terms “upper” and “lower” will be used continuously, but depending on the attitude of the battery pack 10, it may not match “upper” and “lower” (that is, vertically upward and vertically downward) in FIG. There is.

  As shown in FIGS. 3 to 5, the battery pack 10 includes a plurality of battery modules 20, a control unit 30 that controls at least the battery modules 20, and a housing 40 that houses the battery modules 20 and the control unit 30. The lid 50 attached to the housing 40, the first connector 60 (external component) for connecting the battery module 20 to the outside, and the second connector 70 (external component) for connecting the control unit 30 to the outside And a charging connector 80 electrically connected to the battery module 20. The external component is a component exposed to the outside of the battery pack 10 and may be included in the battery pack 10 or may not be included in the battery pack 10. Examples of the external parts include a connector used for connection to the outside of the battery pack 10, a harness connected to the connector, a control lamp, and the like.

  The battery module 20 includes, for example, a plurality (for example, 7 to 13) of battery cells 21 connected in series with each other. The battery cell 21 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The battery modules 20 are connected in parallel to each other by, for example, being integrated and connected to the positive and negative bus bars in a terminal block (not shown).

  The control unit 30 includes, for example, a monitoring ECU (Electronic Control Unit) for monitoring the temperature and voltage of the battery module 20 and electronic components such as an FET relay. Moreover, the control part 30 can control charging / discharging of the battery module 20, for example according to the temperature and voltage of the battery module 20, or according to the request | requirement from the reach lift 1 side.

  The housing 40 has a substantially rectangular parallelepiped outer shape as a whole. The housing 40 includes a rectangular parallelepiped first accommodating portion 41 that accommodates the battery module 20, and a rectangular parallelepiped second accommodating portion 42 that accommodates the control unit 30, the terminal block, and the like. The first accommodating portion 41 includes a pair of flat side wall portions 43 facing each other, an upper surface 44 (third side surface), a side surface 45 (second side surface), and a side surface 46. The battery module 20 is fixed to the side wall 43, for example.

  The upper surface 44 has a rectangular shape. The upper surface 44 connects the side wall portions 43 to each other in the short direction of the upper surface 44 (here, the Y-axis direction). The side surface 45 and the side surface 46 are substantially parallel to each other and face opposite sides in the longitudinal direction of the upper surface 44 (here, the X-axis direction). The side surface 45 and the side surface 46 extend along a direction intersecting (orthogonal) the upper surface 44 from the upper surface 44 (here, the Z-axis direction).

  The upper surface 44 is located below the upper end portion of the side wall portion 43. Therefore, the upper end portion of the side wall portion 43 is a flat plate-like protruding portion 43 p protruding from the upper surface 44. The side surface 45 is formed with a notch portion 45p that is notched on the upper surface 44 side and one side wall portion 43 side. The bottom surface 45b of the notch 45p is substantially parallel to the side surface 45. The bottom surface 45b is connected to the side surface 45 by an inclined surface 45s inclined with respect to the bottom surface 45b. The side surface 45 faces the side opposite to the other side surface 48 described later in the longitudinal direction of the upper surface 44.

  The second accommodating portion 42 protrudes from the upper surface 44 between the pair of side wall portions 43. The second accommodating portion 42 is provided in a part of the upper surface 44 in the longitudinal direction. More specifically, the second accommodating portion 42 is provided in the central portion excluding both end portions in the longitudinal direction of the upper surface 44. The second housing portion 42 includes an upper surface 47 (first side surface) substantially parallel to the upper surface 44 of the first housing portion 41 and a pair of side surfaces 48 substantially parallel to the side surface 45.

  The upper surface 47 is, for example, coincident with the upper end of the protruding portion 43p. Therefore, the upper surface 44 of the first housing part 41 is positioned lower than the upper surface 47 of the second housing part 42 by the height of the second housing part 42 (height of the side surface 48). The upper surface 47 defines the outer shape of the housing 40. More specifically, the upper surface 47 is the top surface of the housing 40.

  The upper surface 44 includes a region 44a and a region 44b located on both ends in the longitudinal direction of the upper surface 44 with the second storage portion 42 interposed therebetween. The region 44 a is located on the side surface 45 side with respect to the second housing portion 42, and the region 44 b is located on the side surface 46 side with respect to the second housing portion 42. The region 44a is surrounded in three directions by the inner surfaces 43s of the pair of projecting portions 43p and the one side surface 48 of the second housing portion 42. The region 44b is surrounded in three directions by the inner surfaces 43s of the pair of projecting portions 43p and the other side surface 48 of the second housing portion 42.

  Considering the upper surface 47 that is the top surface of the housing 40 as a reference, the regions 44 a and 44 b are the bottom surfaces of the recesses 40 a and 40 b provided on the upper surface 47. That is, the recess 40a (second recess) is recessed toward the inside of the housing 40, has a region 44a as a bottom surface, and has an inner surface 43s and one side surface 48 as an inner wall surface. One side surface 48 connects the region 44 a and the upper surface 47. The inner surface 43s extends along a direction (here, the X-axis direction) intersecting (orthogonal) with one side surface 48. The recess 40b (first recess) is recessed toward the inside of the housing 40, has a region 44b as a bottom surface, and has an inner surface 43s and the other side surface 48 as inner walls. The other side surface 48 connects the region 44 b and the upper surface 47. The inner surface 43s extends along a direction intersecting (orthogonal) with the other side surface 48 (here, the X-axis direction).

  Considering the upper surface 44 as a reference, the second accommodating portion 42 and the pair of projecting portions 43 p are wall portions erected on the upper surface 44. The 2nd accommodating part 42 has a pair of side surface 48 as a side surface of the wall part. Each protrusion 43p has an inner surface 43s as a side surface of the wall portion.

  As shown in FIG. 6, openings A1 and A2 are provided in the region 44b. The openings A1 and A2 have a rectangular shape with the same shape. The openings A1 and A2 are juxtaposed in the longitudinal direction of the upper surface 44. Opening A1 is arrange | positioned at the 2nd accommodating part 42 side. The opening A2 is disposed on the side surface 46 side. The region 44b has a peripheral edge R that forms the periphery of the openings A1 and A2.

  The peripheral portion R includes peripheral portions R1 to R3, a pair of peripheral portions R4, and a pair of peripheral portions R5. The peripheral edge portion R1 is located between the opening A1 and the opening A2, and extends along the short side direction of the upper surface 44. The peripheral portion R1 is provided with a plurality of screw holes H1 arranged in the Y-axis direction for fixing the lid 50 to the peripheral portion R1 with bolts B. The peripheral portion R2 faces the peripheral portion R1 across the opening A1 in the X-axis direction and extends along the Y-axis direction. The peripheral edge portion R2 is located between the opening A1 and the other side surface 48 as viewed from the Z-axis direction.

  The peripheral portion R3 faces the peripheral portion R1 across the opening A2 in the X-axis direction and extends along the Y-axis direction. The peripheral edge portion R3 is located between the opening A2 and the side surface 46 when viewed from the Z-axis direction. The pair of peripheral edge portions R4 face each other in the Y-axis direction with the opening A1 interposed therebetween. Each peripheral portion R4 extends along the X-axis direction. The pair of peripheral edge portions R5 face each other in the Y-axis direction with the opening A2 interposed therebetween. Each peripheral portion R5 extends along the X-axis direction.

  The lid 50 is made of a general steel material such as SS400 and SPHC, for example. The lid 50 is formed of, for example, a rectangular plate having a thickness of 5 mm. The thickness and rigidity of the lid 50 are smaller than the thickness and rigidity of each part of the housing 40. The lid 50 is disposed on the region 44b and closes the openings A1 and A2. The lid 50 has an inner surface 50a that faces the peripheral edge R in the Z-axis direction.

  The lid 50 has a fixed portion 51 and extending portions 52 and 53. The fixing part 51 is a part fixed to the housing 40. The fixing portion 51 extends along the Y-axis direction at the center of the lid 50 in the X-axis direction. The fixed portion 51 is provided with a plurality of through holes H2 aligned in the Y-axis direction. The plurality of through holes H2 are provided at positions overlapping the plurality of screw holes H1 when viewed from the Z-axis direction. The fixing portion 51 faces the peripheral portion R1 and is fixed to the peripheral portion R1 with a bolt B. That is, the peripheral portion R1 functions as a fixed portion to which the lid 50 is fixed. The bolt B is inserted through the through hole H2 and fastened to the screw hole H1.

  The extending part 52 is a part that extends from the fixing part 51 to the peripheral parts R2 and R4 of the peripheral part R and closes the opening A1. The extending part 52 has one end 52a connected to the fixed part 51 and the other end 52b located on the opposite side of the one end 52a in the X-axis direction. In a state where the extension portion 52 closes the opening A1 (a state where the extension portion 52 is not deformed), the other end 52b faces the other side surface 48 in the X-axis direction. The extending part 52 is not fixed to the housing 40. For this reason, the extension portion 52 is deformed (for example, elastically deformed (hereinafter the same)) so as to be separated from the peripheral portions R2 and R4 with the fixing portion 51 as a starting point in response to an increase in pressure in the housing 40. The opening A1 is opened. To open the opening A1 is to make the inside of the housing 40 communicate with the outside of the housing 40 through the opening A1.

  The extending portion 53 is a portion that extends from the fixing portion 51 to the peripheral portions R3 and R5 of the peripheral portion R and closes the opening A2. The extending portion 53 has one end 53a connected to the fixed portion 51 and the other end 53b located on the opposite side of the one end 53a in the X-axis direction. The extending part 53 is not fixed to the housing 40. For this reason, the extending part 53 opens the opening A2 by being deformed so as to be separated from the peripheral edge parts R3 and R5 with the fixing part 51 as a starting point in accordance with an increase in the pressure in the housing 40.

  That is, the lid 50 functions as a so-called safety valve by opening the openings A1 and A2 by deformation of the extending portions 52 and 53, and prevents the pressure in the housing 40 from exceeding a specified pressure. The specified pressure is set lower than the pressure at which the housing 40 is damaged when the pressure in the housing 40 increases. The lid 50 is formed of a thin plate having lower rigidity than the other parts of the housing 40 as described above in order to ensure the ease of deformation of the extending portions 52 and 53.

  As shown in FIG. 7, in the state in which the extending portion 52 is deformed, the angle formed by the extending portion 52 with respect to the region 44b is θ, the distance from the fixed portion 51 to the other side surface 48 is D, and the other Let H be the height of the side surface 48 (distance from the region 44b to the upper surface 47). Since the gas in the casing 40 tends to flow outside along the extending portion 52, these parameters are appropriately set so that tan θ ≦ H / D in order to apply the gas flow to the other side surface 48. It only needs to be adjusted.

  As shown in FIG. 6, a seal member S is disposed between the peripheral edge R and the lid body 50. Specifically, the seal member S is disposed between the peripheral portions R2 to R5 and the inner surface 50a of the lid body 50. The seal member S has, for example, a long shape, and is arranged in a rectangular ring shape so as to surround the openings A1 and A2 together with the peripheral edge portion R1. As the sealing member S, for example, polyurethane sponge, EPDM (ethylene / propylene / diene rubber) sponge or the like can be used.

  The sealing member S is pressed against the peripheral portions R2 to R5 by the elastic force of the lid 50 in a state where the lid 50 closes the openings A1 and A2, and is compressed by the peripheral portions R2 to R5 and the lid 50. ing. As a result, the seal member S is elastically deformed to exhibit a sealing property, and closes between the peripheral portions R2 to R5 and the lid 50. The sealing property referred to here is a property of hermetically sealing the member to be sealed.

  As shown in FIGS. 3 to 5, the first connector 60 and the second connector 70 are provided in the recess 40 a (a space surrounded by the inner surface 43 s and the one side surface 48 on the region 44 a). Specifically, the first connector 60 is provided in the region 44a. For example, a harness (external component) connected to a connector (not shown) on the reach lift 1 side is connected to the first connector 60. Thereby, for example, the first connector 60 electrically connects the battery module 20 to the travel motor 2d and the cargo handling motor 2e of the reach lift 1. The extra length of a harness (not shown) connected to the first connector 60 is routed in the recess 40a.

  The second connector 70 is provided on one side surface 48. For example, a signal line (external part) connected to a connector (not shown) on the reach lift 1 side is connected to the second connector 70. Thereby, for example, the second connector 70 electrically connects the control unit 30 to a control unit (not shown) on the reach lift 1 side. The extra length of a signal line (not shown) connected to the second connector 70 is routed in the recess 40a.

  The charging connector 80 is provided on the side surface 45. More specifically, the charging connector 80 protrudes from the bottom surface 45b of the cutout 45p of the side surface 45. The front end portion of the charging connector 80 is located closer to the bottom surface 45b than the surface of the side surface 45 other than the notch 45p. Therefore, the charging connector 80 is located inside the entire outer shape of the housing 40. The charging connector 80 is electrically connected to the battery module 20 in the first housing portion 41. More specifically, the charging connector 80 is connected to the positive and negative bus bars of the terminal block in the first housing portion 41 using, for example, bolts.

  In the region 44a, a communication hole (not shown) that communicates with a connection portion (for example, the bus bar of the terminal block) between the battery module 20 and the charging connector 80 in the first housing portion 41 is formed. In addition, a flat cover 49 that closes the communication hole is provided in the region 44a. Therefore, for example, when the charging connector 80 is replaced, the connecting portion can be accessed through the communication hole with the cover 49 removed.

  Here, the first connector 60, the second connector 70, and the communication hole are all provided in the recess 40a. In other words, the first connector 60 and the like are provided on one side of the housing 40 in the longitudinal direction of the upper surface 44. When the battery pack 10 is accommodated in the accommodating space Hs of the reach lift 1, the concave portion 40a provided with the first connector 60 and the like is disposed on the left side surface 2s side of the vehicle body 2. By accommodating the battery pack 10 in this way, it is possible to easily work on the first connector 60 and the like on the left side of the vehicle body 2 by opening the lid 2h.

  As described above, in the battery pack 10, the extending portions 52 and 53 of the lid body 50 are separated from the peripheral portions R <b> 2 to R <b> 5 with the fixing portion 51 as a starting point in response to an increase in pressure in the housing 40. Thus, the openings A1 and A2 provided in the region 44b of the upper surface 44 are opened. Thereby, the lid 50 functions as a so-called safety valve that prevents the pressure in the housing 40 from rising abnormally. The gas discharged from the inside of the housing 40 to the outside flows out from the gap between the peripheral portions R2 to R5 and the extending portions 52 and 53 in a direction spreading around the openings A1 and A2.

  Considering the upper surface 47 that is the top surface of the housing 40 as a reference, the region 44b in which the openings A1 and A2 are provided is the bottom surface of the recess 40b provided in the upper surface 47. For this reason, it is possible to control the flow of the gas discharged from the inside of the housing 40 through the openings A1 and A2 to the pair of inner surfaces 43s and the other side surface 48 which are the inner wall surfaces of the recess 40b. .

  Considering the upper surface 44 of the housing 40 as a reference, the second housing portion 42 and the pair of protruding portions 43p are erected as wall portions on the upper surface 44 provided with the openings A1 and A2. The 2nd accommodating part 42 has the side surface 48 as a side surface of a wall part, and each protrusion part 43p has the inner surface 43s as a side surface of a wall part. For this reason, it is possible to control the flow of the gas discharged from the inside of the housing 40 through the openings A1 and A2 to the other side surface 48 and the pair of inner surfaces 43s.

  In the housing 40, a charging connector 80 is provided on a side surface 45 (more specifically, a bottom surface 45 b) facing the other side 48. Therefore, if the battery pack 10 is accommodated in the accommodation space Hs of the reach lift 1 so that the side surface 45 is on the near side, the charging connector 80 is easily accessed by opening the lid 2h provided in the accommodation space Hs. It becomes possible. At this time, the gas flowing out from the openings A1 and A2 is controlled by the other side surface 48 opposite to the side surface 45 and the pair of inner surfaces 43s, and therefore does not directly reach the opening 2p of the accommodation space Hs. Therefore, the gas flowing out from the openings A1 and A2 is prevented from flowing out directly from the opening 2p of the accommodation space Hs.

  Considering the upper surface 47 that is the top surface of the housing 40 as a reference, the region 44 a in which the first connector 60 is provided is the bottom surface of the recess 40 a provided in the upper surface 47. Furthermore, one side surface 48 provided with the second connector 70 is an inner wall surface of the recess 40a. That is, the first connector 60 and the second connector 70 are provided in the recess 40a. For this reason, the flow of the gas discharged from the openings A1 and A2 provided in the region 44b which is the bottom surface of the recess 40b does not directly hit the first connector 60 and the second connector 70. Thereby, the influence which the gas discharged | emitted from the inside of the housing | casing 40 has on the 1st connector 60 and the 2nd connector 70 can be suppressed.

  Considering the upper surface 44 of the housing 40 as a reference, the second housing portion 42 is positioned as a wall portion between the openings A1 and A2 and the first connector 60 and the second connector 70 on the upper surface 44. Yes. For this reason, the flow of gas discharged from the openings A1 and A2 does not directly hit the first connector 60 and the second connector 70. Thereby, the influence which the gas discharged | emitted from the inside of the housing | casing 40 has on the 1st connector 60 and the 2nd connector 70 can be suppressed.

  Since the extending portion 52 is deformed so as to be separated from the peripheral portions R2 and R4 with the fixing portion 51 as a starting point, the extending portion 52 is on the opposite side of the one end 52a from the one end 52a connected to the fixing portion 51. The other end 52b positioned is far away from the peripheral portions R2 and R4. For this reason, the gas in the housing | casing 40 tends to flow out from the other end 52b side. Since the other end 52 b faces the other side surface 48, the gas flow flowing out from the inside of the housing 40 reliably hits the other side surface 48. For this reason, the flow of the gas flowing out from the inside of the housing 40 can be reliably controlled.

  Since the extending portion 53 is deformed so as to be separated from the peripheral edge portions R3 and R5 with the fixing portion 51 as a starting point, the extending portion 53 is on the opposite side of the one end 53a from the one end 53a connected to the fixing portion 51. The other end 53b located is far away from the peripheral portions R3 and R5. For this reason, the gas in the housing | casing 40 tends to flow out from the other end 53b side. The flow of gas flowing out from the other end 53 b side is directed to the side surface 46. Therefore, if the battery pack 10 is accommodated in the accommodation space Hs of the reach lift 1 so that the side surface 46 is on the back side, the flow of gas flowing out from the other end 53b side directly reaches the opening 2p of the accommodation space Hs. Absent. Further, in the direction from the opening A2 toward the side surface 46, no external component that is affected by the gas discharged from the housing 40 is provided.

  The above embodiments describe one aspect of the present invention. Therefore, the present invention is not limited to the above. In the present invention, the above can be arbitrarily changed without changing the gist of each claim.

  The openings A1 and A2 may be provided by being rotated 90 degrees in the region 44b. That is, the openings A <b> 1 and A <b> 2 may be arranged in parallel in the short direction of the upper surface 44. In this case, the lid 50 is also rotated 90 degrees and fixed to the housing 40. Since the other end 52b of the extending portion 52 and the other end 53b of the extending portion 53 are opposed to the inner surface 43s, the gas flow flowing out from the inside of the housing 40 surely hits the inner surface 43s. For this reason, the flow of the gas flowing out from the inside of the housing 40 can be reliably controlled.

  Considering the upper surface 47 that is the top surface of the housing 40 as a reference, the concave portion 40a includes inner surfaces 43s of a pair of projecting portions 43p and one side surface 48 of the second accommodating portion 42 as three inner wall surfaces. However, what is necessary is just to have at least 1 or more inner wall surfaces. Moreover, although the recessed part 40b has the inner surface 43s of a pair of protrusion part 43p and the other side surface 48 in the 2nd accommodating part 42 as three inner wall surfaces, it has at least 1 or more inner wall surface. It only has to be.

  Considering the upper surface 44 as a reference, the housing 40 includes the second accommodating portion 42 and the pair of projecting portions 43p as three wall portions erected on the upper surface 44. However, at least one wall portion is provided. It only has to have.

  In the battery pack 10, it is sufficient that at least one opening A1, A2 is provided. Moreover, the battery pack 10 should just be provided with at least 1 extended part 52,53.

  The first connector 60, the second connector 70, and the charging connector 80 may be provided on the outer surface 43 a of the side wall 43, the region 44 a of the upper surface 44, the side surface 45, the side surface 46, or the upper surface 47, for example.

  DESCRIPTION OF SYMBOLS 10 ... Battery pack, 20 ... Battery module, 40 ... Housing | casing, 40a ... Recessed part (2nd recessed part), 40b ... Recessed part (1st recessed part), 42 ... 2nd accommodating part (wall part), 43p ... Protruding part (wall) Part), 43s ... inner surface (inner wall surface), 44 ... upper surface (third side surface), 44b ... region (bottom surface), 45 ... side surface (second side surface), 47 ... upper surface (first side surface), 48 ... side surface (inside) Wall surface), 50 ... lid, 51 ... fixed part, 52, 53 ... extending part, 52a, 53a ... one end, 52b, 53b ... other end, 60 ... first connector, 70 ... second connector, 80 ... charging connector A1, A2 ... opening, R ... peripheral edge, R1-R5 ... peripheral edge.

Claims (5)

A battery module;
A housing for housing the battery module;
A plate-like lid that closes the opening provided in the housing, and
The lid body includes a fixed portion fixed to the housing, and an extending portion extending from the fixed portion so as to reach a peripheral edge portion of the opening,
The extending portion opens the opening by being deformed so as to be separated from the peripheral portion with the fixed portion as a starting point in response to an increase in pressure in the housing,
The housing has a first side surface provided with a first recess recessed toward the inside of the housing,
The first recess has a bottom surface, and an inner wall surface connecting the bottom surface and the first side surface,
The opening is a battery pack provided on the bottom surface. The housing has a second side facing the side opposite to the inner wall surface,
The battery pack according to claim 1, wherein a charging connector is provided on the second side surface. The first side surface is provided with a second recess that is recessed toward the inside of the housing,
The battery pack according to claim 1, wherein an external component is provided in the second recess. The extending portion has one end connected to the fixed portion and the other end located on the opposite side of the one end,
The battery pack according to claim 1, wherein the other end faces the inner wall surface. A battery module;
A housing for housing the battery module;
A plate-like lid that closes the opening provided in the housing, and
The lid body includes a fixed portion fixed to the housing, and an extending portion extending from the fixed portion so as to reach a peripheral edge portion of the opening,
The extending portion opens the opening by being deformed so as to be separated from the peripheral portion with the fixed portion as a starting point in response to an increase in pressure in the housing,
The housing includes a third side surface provided with the opening and a wall portion standing on the third side surface.

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