JP2007018827A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack which effectively prevents supercooling of the secondary battery used in cold climates and has a small outer size and a tough structure. <P>SOLUTION: In the battery pack; a plurality of secondary cells 1 are housed in a plastic-made inner case 3 to make an inner pack 4, the outer side of the inner pack 4 is covered with and reinforced by a metal chassis 16, and the inner case 3 is housed in a plastic-made outer case 5. The outer case 5 is divided into a pair of cylindrical cases 5A with a face perpendicular to the longitudinal direction as a division line 15. One end of the cylindrical case 5A is closed with an end plate 5c, and the other end thereof has an opening 5f. The pair of cylindrical cases 5A are each fixed to the metal chassis 16 through the end plate 5c with set screws 36. The metal chassis 16 has tapped holes 18. The cylindrical cases 5A are fixed to the metal chassis 16 by the set screws 36 screwed in the tapped holes 18, thereby hermetically connecting the openings of the pair of cylindrical cases 5A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention mainly relates to a battery pack that accommodates a large number of secondary batteries in a case and is optimal for outdoor use.

A battery pack used as a power source for a relay device such as a mobile phone or a broadcasting device supplies power to the relay device when a commercial power supply fails. As described above, the battery pack for outdoor use is required to operate in a wide temperature range in addition to excellent durability and strength. This type of battery pack includes, for example, a large number of secondary batteries and a circuit board housed in a plastic case (see Patent Document 1). In addition to realizing sufficient strength against external impacts, the battery pack with this structure needs to prevent water from entering inside as a waterproof structure. In order to eliminate this drawback, cases have been developed in which a metal such as aluminum is cast to form a sealed structure. However, the metal-cast case is excellent in heat conduction, so when used in a cold region, the built-in secondary battery is cooled by the outside air, resulting in a significant decrease in temperature and battery performance. There is a drawback of shortening the service life.
JP 2005-56721 A

  The present invention was developed for the purpose of solving such drawbacks, and an important object of the present invention is that it is excellent in use in a cold region while effectively preventing overcooling of the secondary battery. An object of the present invention is to provide a battery pack that can have a strong structure as a waterproof structure.

The battery pack of the present invention has the following configuration in order to achieve the aforementioned object.
The battery pack is a battery pack in which a plurality of secondary batteries 1 are housed. The secondary battery 1 is housed in a plastic inner case 3 to form an inner pack 4, and the outer side of the inner pack 4 is a metal chassis. The inner case 3 covered with the metal chassis 16 and further reinforced with the metal chassis 16 is housed in an outer case 5 made of plastic. The outer case 5 is divided into a pair of cylindrical cases 5 </ b> A using a surface orthogonal to the length direction as a dividing line 15, and is molded from plastic. The cylindrical case 5A has a shape in which one end is closed by an end plate portion 5c and the other end is an opening 5f. In the pair of cylindrical cases 5A, the end plate portion 5c is fixed to the metal chassis 16 with a set screw 36, and the periphery of the opening 5f is connected in a sealed state. The metal chassis 16 has a screw hole 18 into which a set screw 36 is screwed, and the cylindrical case 5A is fixed to the metal chassis 16 with the set screw 36 screwed into the screw hole 18 so as to open the openings 5f of the pair of cylinder cases 5A. Are connected in a sealed state.

  The battery pack of the present invention can be connected in a sealed state by wrapping the opening edges of the pair of cylindrical cases 5A. In the battery pack of the present invention, the pair of cylindrical cases 5A can be connected in a sealed state with the packing 20 sandwiched between the wrap portions.

  In the battery pack of the present invention, the cylindrical case 5A is formed into a tapered shape that increases the inner cross-sectional shape from the end plate portion 5c toward the opening portion 5f, and a plurality of rows are formed on the surface in parallel with the dividing lines 15. The ridges 38 can be integrally formed and provided.

  In the battery pack of the present invention, a set screw 36 for fixing the inner case 3 and the outer case 5 is screwed into the metal chassis 16, and the inner pack 4 and the outer case 5 can be fixed to the metal chassis 16 with the set screw 36. it can.

  The battery pack of the present invention can cover the three surfaces of the inner pack 4, that is, the side surface, the upper surface, and the lower surface, by forming the metal chassis 16 by bending a metal plate into a U shape.

  In the battery pack of the present invention, the metal chassis 16 is made of two metal plates that cover both side surfaces of the inner pack 4, and the two metal chassis 16 are connected by the chassis holder 28, so Can be fixed.

  In the battery pack of the present invention, the metal chassis 16 is provided with the insertion opening 16A, the protrusion 3e that is inserted into the insertion opening 16A is provided on the surface of the inner pack 4, and the protrusion 3e of the inner pack 4 is connected to the metal chassis 16. It can be inserted into the insertion opening 16A.

  The battery pack of the present invention is used in a cold region to effectively prevent overcooling of the secondary battery, while realizing an excellent waterproof structure to prevent water from entering the inside, and to have a tough structure. realizable. An excellent waterproof structure divides the plastic outer case into a pair of cylindrical cases with the plane perpendicular to the length direction as a dividing line, minimizes the dividing line, and further splits and forms a pair of cylinders This is realized by fixing the end plate portions located at both ends of the case to a metal chassis provided inside the outer case with a set screw and connecting the peripheral edge of the opening of the cylindrical case in a sealed state. The outer case with this structure has an end plate portion fixed to a strong metal chassis disposed inside without connecting a pair of cylindrical cases to each other while minimizing the dividing line. Can be firmly connected in a state of pressing each other. A set screw for connecting the end plate portion to the metal chassis is fixed to the metal chassis while pressing the cylindrical case in the longitudinal direction. The pair of cylindrical cases pressed in the longitudinal direction are connected in a state where the opening edges are in close contact with each other, and are connected to the sealed structure.

  In addition, as described above, the battery pack of the present invention is provided with a screw boss in the cylindrical case and screwed in the set screw in order to fix the end plate portion to the metal chassis with the set screw and to connect to the sealed structure. There is no need to concatenate. The conventional connection structure, in which a screw boss is provided and a set screw is screwed in here, needs to be formed thick in order to make the portion of the outer case where the screw boss is provided sufficient strength. The set screw fixed to the screw boss cannot be fixed in a strong state like the set screw screwed into the metal chassis like the battery pack of the present invention. In the battery pack of the present invention, a metal chassis is disposed inside the outer case, and the end plate portion of the cylindrical case is fixed to the metal chassis with a set screw screwed into the metal chassis, and the opening edge of the cylindrical case is formed. Connect to a sealed structure. This structure does not need to be thickly formed by providing a screw boss on the outer case, and has a strong structure with a metal chassis disposed inside the outer case while reducing the outer case and increasing the internal volume. By fixing the end plate of the cylindrical case to this metal chassis, an ideal waterproof structure is realized.

  The battery pack according to the present invention also includes a plurality of secondary batteries and a circuit board housed in a plastic inner case to form an inner pack, and the outer side of the inner pack is covered with a metal chassis to be reinforced. In order to store the reinforced inner case in the plastic outer case, the inner case insulates and insulates the secondary battery, and further covers the outer side of the metal chassis with the plastic outer case for thermal insulation. A built-in secondary battery is effectively insulated with two plastic layers comprising a case and an outer case. For this reason, in a cold district, it is possible to reduce the cooling of the secondary battery by the outside air, and to prevent the secondary battery from being overcooled to deteriorate the battery performance or shorten the life.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The battery pack shown in FIGS. 1 to 7 is used, for example, as a power source for electrical equipment installed outdoors such as a telephone repeater. Therefore, it is used from a low temperature to a high temperature, for example, at an external temperature of -30C to 80C. In addition, the battery pack for outdoor use is required to have excellent durability and strength.

  The battery pack shown in FIGS. 1 to 7 includes an inner pack 4, an outer case 5 housing the inner pack 4, a metal chassis 16 disposed between the inner pack 4 and the outer case 5, A heater 27 is provided that heats the secondary battery 1 that is fixed to the outside of the inner pack 4 and built therein. Further, the battery pack shown in these drawings includes a circuit board that controls charging / discharging of the battery and energization of the heater 27. The circuit board includes a first circuit board 2 built in the inner case 3 and a second circuit board 6 disposed outside the inner case 3 and between the inner case 3 and the outer case 5. It is separated.

  The inner pack 4 stores a plurality of secondary batteries 1 and a first circuit board 2 in a box-shaped inner case 3. The inner case 3 is made of plastic, and the top plate 3a and the bottom plate 3b are divided in the middle to divide the case unit 3A into a U-shaped cross section. In this specification, the top plate 3a and the bottom plate 3b are specified on the basis of the drawings. In the drawing, the plate above the inner case 3 is the top plate 3a, and the lower plate is the bottom plate 3b. The pair of case units 3 </ b> A that are divided and formed are connected to each other to form a box shape that houses the secondary battery 1 and the first circuit board 2. In the inner case 3 shown in FIGS. 2 to 7, the top plate 3a and the bottom plate 3b are divided at positions that are omnipresent on one side instead of the center. In the inner case 3, in FIG. 6, the left case unit 3A has a wide top plate 3a and a bottom plate 3b, and the right case unit 3A has a narrow top plate 3a and a bottom plate 3b. The case unit 3A shown in these figures is integrally formed with a top plate 3a on the upper edge of the square side plate 3d, a bottom plate 3b on the lower edge, and an end plate portion 3c on both ends, and the side portions are formed. It is molded into an open rectangular box. The case unit 3A having this shape has a shape in which a peripheral wall including a top plate 3a, a bottom plate 3b, and an end plate portion 3c is integrally formed around the side plate 3d. The pair of case units 3A that are divided and molded from plastic are connected by screws 17 with the edges of the peripheral wall formed by the top plate 3a, the bottom plate 3b, and the end plate portion 3c abutting each other.

  The battery pack incorporates a first circuit board 2 and a second circuit board 6. The first circuit board 2 is disposed inside the inner case 3, and the second circuit board 6 is disposed outside the inner case 3 and inside the outer case 5. The first circuit board 2 does not mount an electronic circuit including a high-power electronic component that generates heat by flowing a large current. For example, the first circuit board 2 is mounted with a circuit that detects each battery voltage and battery temperature. A high-power electronic component that generates heat by flowing a large current and an electronic circuit including the high-power electronic component are mounted on the second circuit board 6. The first circuit board 2 is connected to the electrode of the secondary battery 1 via a lead wire 7 and a lead plate 8, and the second circuit board 6 is connected to the first circuit board via a lead wire (not shown). 2 and connected to the output of the secondary battery 1 through a thick lead wire 10.

  The first circuit board 2 is disposed between the inner surface of the side plate 3d and the secondary battery 1 in a posture parallel to the inner surface of the inner case 3, that is, the side plate 3d. In the illustrated battery pack, the first circuit board 2 is placed in the first board holder 11 and stored in the inner case 3. The first substrate holder 11 is made of plastic and formed into a box shape with a peripheral wall. The first substrate holder 11 puts the first circuit board 2 inside the peripheral wall, fills the inside of the peripheral wall with an insulating resin (not shown), and covers the first circuit board 2 with the insulating resin. ing. With this structure, the first circuit board 2 can be insulated and disposed in the inner case 3. For this reason, even if electrolyte solution leaks from the secondary battery 1 in the inner case 3 or gas is released, the circuit board can be insulated and protected from the electrolyte solution and gas.

  The first circuit board 2 housed in the inner case 3 is protected by the inner case 3. Furthermore, the first circuit board 2 that is placed in the first substrate holder 11 and accommodated in the inner case 3 is protected by both the first substrate holder 11 and the inner case 3. With this structure, the first circuit board 2 and the first board holder 11 can be made thin and light. This is because they do not require strong strength.

  In the illustrated inner pack 4, the bottom surface side of the first substrate holder 11 is disposed on the secondary battery 1 side. In other words, the opening of the first substrate holder 11 is arranged on the side plate 3 d side of the inner case 3. In the inner pack 4, the bottom plate of the first substrate holder 11 is disposed between the first circuit board 2 and the secondary battery 1. In the inner pack, the bottom plate of the first substrate holder can be arranged opposite to the side plate of the inner case, contrary to this figure. In this inner pack, the electronic components fixed to the first circuit board are arranged so as to protrude in the valley formed between the secondary batteries, the first circuit board approaches the secondary battery, and the outer pack The outer shape of the case can be reduced. Moreover, the electronic component currently fixed to the surface can also be arrange | positioned in the trough made between secondary batteries, without accommodating a 1st circuit board in a 1st board | substrate holder. Furthermore, a through hole is provided in the bottom of the first substrate holder, and the electronic component fixed to the first circuit board is projected into the through hole, and the electronic component is disposed in the valley between the secondary batteries. You can also.

  The first circuit board 2 is connected to the secondary battery 1 via the lead wire 7 and the lead plate 8. In other words, the plurality of secondary batteries 1 are connected to each other by the lead plate 8, and the lead plate 8 is connected to the first circuit board 2 through the lead wires 7. Since the first circuit board 2 is fixed to the first board holder 11, both the first circuit board 2 and the first board holder 11 are connected to the secondary battery 1 via the lead wire 7 and the lead plate 8. Connected to

  The secondary battery 1 is a cylindrical lithium ion secondary battery. However, a square battery can be used as the secondary battery instead of the cylindrical battery. The secondary battery is not limited to a lithium ion secondary battery, and any other secondary battery such as a nickel metal hydride battery or a nickel cadmium battery can be used. As shown in FIG. 6, the battery pack shown in FIG. 6 has a plurality of secondary batteries 1 arranged in parallel with each other, arranged in a plane parallel to the surface of the first circuit board 2, and further, both end faces are flush with each other. As the posture to be positioned in the inner case 3, the inner case 3 is stored in a row. In the secondary batteries 1 arranged in three rows, the secondary batteries 1 in adjacent rows are arranged in the valley. Further, a spacer 12 made of an insulating material is disposed between the secondary batteries 1. In the illustrated inner pack 4, the secondary batteries 1 are arranged in three rows. However, in the inner pack, the secondary batteries can be arranged in one or two rows, or in four or more rows.

  The secondary battery 1 has a lead plate 8 connected to its end face. The lead plate 8 connects the secondary batteries 1 in parallel and connects them in series. The lead plate 8 shown in the figure is connected to the electrode surfaces of the six secondary batteries 1 by a method such as spot welding. In this inner pack 4, three secondary batteries 1 are connected in parallel to form one block, and 13 blocks connected in parallel are connected in series.

  The second circuit board 6 is disposed outside the inner pack 4 and inside the outer case 5. The second circuit board 6 is fixed inside the second board holder 13 made of plastic. The second substrate holder 13 is fixed to the upper surface of the inner pack 4. The second substrate holder 13 has a rectangular box shape that opens downward, and is filled with an insulating resin (not shown) to cover the second circuit board 6 with the insulating resin. The second circuit board 6 is connected to the first circuit board 2 and the secondary battery 1 via lead wires (not shown).

  In the illustrated battery pack, a metal chassis 16 is provided on the inner surface of the outer case 5. The metal chassis 16 is provided between the outer case 5 and the inner pack 4 to reinforce the case. The battery pack shown in FIG. 2 is formed by bending and pressing two metal plates to form a metal chassis 16 and reinforcing the inner side of the outer case 5. The metal chassis 16 is bent into a shape disposed between the inner pack 4 and the outer case 5.

  The metal chassis 16 fixes the inner pack 4 that fixes the second substrate holder 13 on the inner side, and the outer case 5 on the outer side. The metal chassis 16 is provided with a screw hole 18 into which a set screw 36 for fixing the inner pack 4 and the outer case 5 is screwed. The set screw 36 is screwed into the metal chassis 16 to fix the inner pack 4 and the outer case 5. Further, a connector 19 and the like are also fixed to the metal chassis 16.

  In the battery pack shown in FIG. 2, an insertion opening 16 </ b> A is provided in the metal chassis 16, and a protruding portion 3 e that can be inserted into the insertion opening 16 </ b> A is provided on the surface of the inner pack 4. In the illustrated metal chassis 16, an insertion opening 16 </ b> A is opened at a portion facing the side surface of the inner pack 4. The inner pack 4 is provided with a protruding portion 3e to be inserted into the insertion opening 16A on the side surface. The inner pack 4 is provided with a protruding portion 3e at a central portion of the side plate 3d of the inner case 3 except for the outer peripheral edge portion. In this structure, since the protruding portion 3e of the inner pack 4 can be inserted into the insertion opening 16A of the metal chassis 16, the outer shape can be reduced and the lateral width of the battery pack can be reduced while reinforcing with the metal chassis 16.

  In the battery pack of FIG. 2, the metal chassis 16 is composed of two metal plates. The metal chassis 16 made of two metal plates is disposed on both sides of the inner pack 4 inside the outer case 5 and covers both side surfaces of the inner pack 4. The two metal chassis 16 are connected by a chassis holder 28 and fixed to both surfaces of the inner pack 4. Further, the metal chassis 16 is fixed to the inner pack 4 with screws. However, the metal chassis can be fixed to the inner pack and the second substrate holder.

  The metal chassis 16 fixes the heat generating component and is used together with the heat radiating plate of the heat generating component. The heat-generating component is a high-power electronic component such as a diode or FET that conducts a large current. These high-power electronic components are electronic components that are connected in series with the battery and allow the load current and charging current of the battery to flow.

  In the illustrated battery pack, a heater 27 is fixed to the upper and lower surfaces of the inner pack 4. The heater 27 is a planar heater having a heating wire such as a nichrome wire inside, or a planar heater such as PTC. When the outside air temperature decreases and the temperature of the secondary battery 1 becomes lower than the minimum operating temperature, the heater 27 is energized to warm the secondary battery 1 to a set temperature and hold it at a temperature at which it can be used normally. For example, a battery pack used as a power source for a relay machine or the like installed outdoors detects the temperature or ambient temperature of the secondary battery 1 with a temperature sensor (not shown) and controls the energization of the heater 27. Provide a circuit. This control circuit is mounted on a circuit board. When the battery temperature becomes lower than the minimum operating temperature or the ambient temperature becomes lower than the preset minimum temperature, the control circuit energizes the heater 27 to heat the inner pack 4. The electric power supplied to the heater 27 is supplied from the secondary battery 1 built in the battery pack or from a commercial power source for floating charging the battery pack. The control circuit controls the power supplied to the heater 27 to keep the temperature of the secondary battery 1 at the set temperature.

  Further, the metal chassis 16 shown in FIGS. 8 to 10 is formed by bending one metal plate into a U-shaped cross section. Although not shown, the metal chassis 16 having this shape can cover the three sides of the inner pack, that is, the side surface, the upper surface, and the lower surface. The metal chassis 16 in these drawings is provided with screw holes 18 at both ends for screwing set screws for fixing the inner pack 4 and the outer case 5.

  The metal chassis 16 in FIG. 8 is provided with a recess 30 in a portion facing the heater to be a non-connection portion. In the metal chassis 16, the heater is disposed in the non-connection portion of the recess 30 so that the heater does not directly contact, and the heater and the metal chassis 16 are insulated from the air in the non-connection portion. Heat of the heater is not conducted to the metal chassis 16 that is not in direct contact, but is conducted to the inner pack 4 that is in direct contact.

  The metal chassis 16 in FIG. 9 is provided with a convex portion 31 at a non-contact position of the heater of the metal chassis 16 so that the heater does not directly contact the metal chassis 16, and the surface facing the heater is a non-connecting portion. The convex portion 31 prevents the non-connected portion of the metal chassis 16 from coming into contact with the heater and prevents the heat of the heater from being conducted to the metal chassis 16.

  Furthermore, the metal chassis 16 of FIG. This metal chassis 16 is provided with an opening 32 on a surface facing the heater so that the heater does not directly contact the metal chassis 16, thereby forming a non-connection portion. A heater is disposed in the non-connecting portion formed of the opening 32 to bring the heater and the metal chassis 16 into a non-contact state, thereby preventing the heat of the heater from being conducted to the metal chassis 16, Conducting.

  The outer case 5 shown in FIG. 1 and FIG. 2 is divided into a pair of cylindrical cases 5 </ b> A using a surface perpendicular to the length direction as a dividing line 15 and molded from plastic. The outer case 5 shown in the figure has a rectangular shape that is vertically elongated. The pair of cylindrical cases 5A has a shape in which one end is closed by an end plate portion 5c and the other end is an opening 5f. The outer case 5 is formed of plastic in a rectangular tube shape in which the top plate 5a, the bottom plate 5b, and the side plate 5d are divided into two at the center and both ends are closed by the end plate 5c. Since the outer case 5 is divided into two at both ends, the dividing line 15 becomes a direction orthogonal to the longitudinal direction of the outer case 5 and has the shortest distance. The pair of divided cylindrical cases 5A are fixed to the metal chassis 16 with a set screw 36 that passes through an end plate portion 5c that closes one end. The pair of cylindrical cases 5A fixed to the metal chassis 16 connects the periphery of the opening 5f in a sealed state. As shown in the cross-sectional view of FIG. 3, the pair of cylindrical cases 5 </ b> A are connected in a sealed state by wrapping the opening edge and sandwiching the packing 20 on the wrap portion. The cylindrical case 5A of FIG. 3 is provided with a fitting step portion 23 at the opening edge. A rubber-like elastic packing 20 is sandwiched between the contact surfaces of the fitting stepped portion 23 and connected to a sealed structure. The fitting stepped portions 23 wrap each other in a shape in which a concave portion 24 is provided on one abutting surface and a convex strip 25 guided by the concave portion 24 is provided on the other abutting surface so that they can be fitted to each other. It has a structure. The fitting step portion 23 is connected to the waterproof structure by inserting the protrusion 25 on the contact surface into the recess 24 and sandwiching the packing 20 between the wrap portions. Furthermore, the outer case 5 in the figure covers the outside of the opening 5f with a close-contact cover 26. The close-contact cover 26 is in close contact with the outside of the dividing line 15 of the cylindrical case 5A to waterproof the dividing line 15. Further, the close contact cover 26 reinforces the strength of the connecting portion. The close-contact cover 26 is a plastic sheet, and is contracted and adhered by inserting the outer case 5.

  In the outer case 5 of FIGS. 1 and 2, a metal plate 37 is laminated on an end plate portion 5c of a cylindrical case 5A located in the lower left in the drawing. The cylindrical case 5 </ b> A fixes the end plate portion 5 c to the metal chassis 16 with a set screw 36 that penetrates the metal plate 37. The end plate portion 5c on which the metal plate 37 is laminated is provided with an opening hole 5e of the connector 19 which is an output terminal.

  The cylindrical case 5A made of plastic is formed into a taper shape that increases the inner cross-sectional shape from the end plate portion 5c toward the opening portion 5f. Furthermore, a plurality of rows of ridges 38 are integrally formed on the surface of the cylindrical case 5 </ b> A, which is an outer case, in parallel with the dividing line 15. The outer case 5 having this structure can smoothly remove the molded cylindrical case 5A from the mold by engaging the protruding ridges 38 on the surface. In particular, the cylindrical case 5A that can be demolded by locking the ridges 38 can prevent breakage when pulled and demolded, and can suppress the taper angle, ie, the gradient, formed into a tapered shape to a minimum. Can do. For this reason, the space in the outer case 5 can be used effectively by reducing the difference between the area of the end plate portion 5c and the opening area of the opening 5f. Further, the ridges 38 provided on the surface are also effective in countermeasures against molding defects such as warping and shrinkage of the outer case 5.

1 is a perspective view of a battery pack according to an embodiment of the present invention. It is a disassembled perspective view of the battery pack shown in FIG. It is a partially expanded horizontal sectional view of the battery pack shown in FIG. FIG. 2 is a partially enlarged vertical vertical sectional view of the battery pack shown in FIG. 1. FIG. 2 is a partially enlarged vertical cross-sectional view of the battery pack shown in FIG. 1. It is a disassembled perspective view of the inner pack of the battery pack shown in FIG. It is a horizontal sectional view of the inner pack of the battery pack shown in FIG. It is a perspective view which shows another example of a metal chassis. It is a perspective view which shows another example of a metal chassis. It is a perspective view which shows another example of a metal chassis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Secondary battery 2 ... 1st circuit board 3 ... Inner case 3A ... Case unit
3a ... top plate
3b ... Bottom plate
3c ... End plate
3d ... Side plate
3e ... projecting part 4 ... inner pack 5 ... outer case 5A ... cylindrical case
5a ... top plate
5b ... Bottom plate
5c ... End plate
5d ... Side plate
5e ... Open hole
5f ... opening 6 ... second circuit board 7 ... lead wire 8 ... lead plate 10 ... thick lead wire 11 ... first substrate holder 12 ... spacer 13 ... second substrate holder 15 ... dividing line 16 ... metal chassis 16A ... Insertion opening 17 ... Screw 18 ... Screw hole 19 ... Connector 20 ... Packing 23 ... Fitting step part 24 ... Recess 25 ... Projection 26 ... Adhesive cover 27 ... Heater 28 ... Chassis holder 30 ... Recess 31 ... Projection 32 ... Opening 36 ... Set screw 37 ... Metal plate 38 ... Projection

Claims (8)

A battery pack containing a plurality of secondary batteries (1),
The secondary battery (1) is stored in a plastic inner case (3) to form an inner pack (4), and the outer side of the inner pack (4) is covered with a metal chassis (16) to be reinforced. The inner case (3) reinforced with (16) is stored in the plastic outer case (5).
The outer case (5) is divided into a pair of cylindrical cases (5A) with a plane perpendicular to the length direction as a dividing line (15), and is molded of plastic. This cylindrical case (5A) has one end plate It is closed with the part (5c) and has a shape with the other end as the opening (5f),
The pair of cylindrical cases (5A) has the end plate (5c) fixed to the metal chassis (16) with a set screw (36), and the periphery of the opening (5f) is connected in a sealed state. (16) has a screw hole (18) into which the set screw (36) is screwed, and the cylindrical case (5A) is fixed to the metal chassis (16) with the set screw (36) screwed into this screw hole (18). A battery pack in which the openings (5f) of the pair of cylindrical cases (5A) are connected in a sealed state.   The battery pack according to claim 1, wherein the pair of cylindrical cases (5A) are connected in a sealed state by wrapping the opening edges.   The battery pack according to claim 1, wherein the pair of cylindrical cases (5A) are connected in a sealed state with a packing (20) sandwiched between the wrap portions.   The cylindrical case (5A) is formed into a taper shape that increases the inner cross-sectional shape from the end plate portion (5c) toward the opening portion (5f), and on the surface, a plurality of rows are formed in parallel with the dividing line (15). The battery pack according to claim 1, wherein the protrusions (38) are integrally molded.   Screw the set screw (36) that secures the inner case (3) and outer case (5) into the metal chassis (16), and connect the inner pack (4) and outer case (5) to the metal chassis with the set screw (36). The battery pack according to claim 1, wherein the battery pack is fixed to the chassis (16).   The battery pack according to claim 1, wherein the metal chassis (16) is formed by bending a metal plate into a U-shape so as to cover the three sides of the inner pack (4): a side surface, an upper surface and a lower surface.   The metal chassis (16) consists of two metal plates that cover both sides of the inner pack (4). The two metal chassis (16) are connected by the chassis holder (28), and the inner pack (4 The battery pack according to claim 1, wherein the battery pack is fixed to both sides of the battery. The metal chassis (16) has an insertion opening (16A), and a protrusion (3e) that can be inserted into the insertion opening (16A) is provided on the surface of the inner pack (4), and the protrusion of the inner pack (4) The battery pack according to claim 1, wherein (3e) is inserted into the insertion opening (16A) of the metal chassis (16).

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