JP2005108481A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack which can perform assembly work and wiring safely and easily. <P>SOLUTION: The battery pack comprises a top casing and a bottom casing 3. A plurality of support ribs 18, 37 for supporting the side of a unit cell are formed integrally inside the bottom casing 3. The curvature of the contact of the support ribs 18, 37 with the unit cell is larger than the curvature of the outer diameter of the unit cell. The battery pack has a partition 35 which partitions a battery holder 14 and a control circuit board holder 15; and projection ribs 30 which are on a partition 35 and inside the bottom casing 3, faces each other, and locks both end faces of the unit cell. The distance between the tips of the projection ribs 30 is larger than the length between both the end faces of the unit cell. This can make the work for holding the unit cells in the bottom casing 3 easy and can reduce the influence on the bottom casing 3 and the influence of a concentrated load or the like on the unit cells under thermal expansion of the unit cells. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a battery pack, and more particularly to a battery pack in which a cylindrical battery is accommodated in a case.

  Conventionally, in an assembled battery in which a plurality of unit cells are combined, the unit cells are connected in series and / or in parallel. For example, in an assembled battery in which three columnar cells are adjacent and juxtaposed upside down, the terminals of the cells are connected in series with plate-shaped metal connection bus bars, and external outputs are connected to both ends of the assembled battery. The terminal is connected, and the entire assembled battery is held in an exterior case made of an electrically insulating resin (for example, see Patent Document 1) or covered with a heat shrink shrink tube or the like to ensure electrical insulation (for example, , See Patent Document 2).

  When covering the entire battery pack with a heat-shrinkable shrink tube, simply covering the battery pack with a heat-shrinkable shrink tube can easily break the tube during heat shrinkage due to sharp edges and protrusions protruding from the battery pack before coating. The edge is hidden with paper.

JP 2001-325931 A JP 2002-157982 A

  However, for example, when a lithium battery, which is a high-performance secondary battery, is used as a single battery, if the above-mentioned electrical insulating paper is simply placed on the assembled battery, each lithium battery will have all the voltage for charge / discharge management. Since it is necessary to measure, the wiring work becomes complicated, and there is a problem that the safety and efficiency of the work are poor when all the bus bars connecting the single cells are completely exposed. On the other hand, since the secondary battery generally generates heat by charging / discharging, it is necessary to dispose a control circuit board for measuring the battery voltage separately from the secondary battery.

  In view of the above draft of the present invention, it is an object to provide a battery pack capable of safely and efficiently performing assembly and wiring work.

  In order to solve the above problems, a first aspect of the present invention is a battery pack in which a cylindrical battery is accommodated in a case, and a plurality of protrusions that support the side surface of the cylindrical battery inside the case. It has a rib, The curvature of the part which contacts the said cylindrical battery of this protruding rib is larger than the outer-diameter curvature of the said cylindrical battery, It is characterized by the above-mentioned. In the first aspect, the case has a plurality of projecting ribs having a curvature larger than the outer curvature of the cylindrical battery on the inner side, so that the operation of housing the cylindrical battery in the case can be easily performed. The influence on the case and the cylindrical battery at the time of thermal expansion of the cylindrical battery can be suppressed.

  The second aspect of the present invention is a battery pack in which a cylindrical battery is accommodated in a case, and has protruding ribs for locking both end faces of the cylindrical battery on the inner side of the case. The distance between the tips of the ribs is greater than the length between both end faces of the cylindrical battery. In the second aspect, the case has projecting ribs for locking the both end faces of the cylindrical battery on the inside, and the distance between the tips of the projecting ribs is larger than the length between the both end faces of the cylindrical battery. The operation of housing the battery in the case can be easily performed, and the influence on the case and the cylindrical battery during thermal expansion of the cylindrical battery can be suppressed.

  In the first and second aspects, when the case is manufactured by resin molding, the protruding rib and the protruding rib function to prevent the case frame from falling into the inside of the case frame, thereby improving the formation accuracy of the case. be able to.

  Furthermore, a third aspect of the present invention is a battery pack in which a cylindrical battery is accommodated in a case, wherein the case has an upper lid case and a lower lid case, and the lower lid case includes the cylindrical battery. It has a depth that exposes at least 1/2 of the diameter of the cylindrical battery. In the third aspect, the cylindrical battery is accommodated in a case having an upper lid and a lower lid case, and when the separation position of the upper lid and the lower lid case accommodates the cylindrical battery, 1/2 or more of the diameter of the cylindrical battery is accommodated. Since it is exposed and the depth of the lower lid case is smaller than the radius of the cylindrical battery, wiring and electrical connection can be performed safely and efficiently even after the cylindrical battery is accommodated in the lower lid case.

  According to a fourth aspect of the present invention, there is provided a battery pack in which a cylindrical battery is accommodated in a case, wherein the case has an upper lid case and a lower lid case, and the lower lid case is formed of the cylindrical battery. It has an accommodating part and the accommodating part of a control circuit board, The said control circuit board is being fixed to the support part protrudingly provided inside the said lower cover case, It is characterized by the above-mentioned. In the fourth aspect, since the lower lid case is divided into a cylindrical battery housing portion and a cylindrical battery control circuit board housing portion, the control circuit board is previously placed in the lower lid case before housing the cylindrical battery. It is possible to improve safety and workability by attaching to the base, and since the support part protrudes from the inside of the lower lid case, the mounting position of the control circuit board is clarified and workability is improved. Can do. In this embodiment, the control circuit board is formed with a plurality of board cutouts, and a notch larger than the board cutout is formed at a position corresponding to the board cutout at the tip of the support portion. If the distance is larger than the distance between the notches formed at the tip of the support portion, the influence at the time of thermal expansion can be reduced, and the board can be easily inserted even when the board is inserted, Both workability and safety can be improved.

  According to a fifth aspect of the present invention, there is provided a battery pack in which a cylindrical battery is accommodated in a case, the case having an upper lid case and a lower lid case, and the upper surface of the upper lid case has the cylinder on the back side. A main surface having a plurality of protruding ribs for supporting the side surface of the battery, and a sub surface that is one step lower than the main surface and smaller in area than the main surface, and for taking out the input / output terminals and signal lines on the sub surface And a take-out port. In the fifth aspect, since the sub surface is one step lower than the main surface supporting the cylindrical battery on the back side, when connecting to the input / output terminal from the outside or taking out the signal line, for example, a connecting member such as a bolt The tip and the signal line of the main surface do not protrude from the main surface, the battery pack can be provided with versatility, for example, by placing a control circuit board or the like on the lower back side of the sub surface, The structure that separates the portion that accommodates the cylindrical battery and the portion that accommodates the control circuit board, etc., and can prevent the control circuit board and the like from being affected even if heat is generated in the cylindrical battery.

  In the fifth aspect, if the upper lid case has a V-shaped or U-shaped projecting portion around the input / output terminal at the input / output terminal mounting portion, the input / output terminal is provided at the input / output terminal mounting portion. When mounting, the protrusions are crushed (deformed) to improve the adhesion of the input / output terminals, so sealing is possible even without a seal member such as rubber packing, reducing assembly man-hours and increasing work efficiency. it can. If the take-out port penetrates the upper lid case and has a cylindrical shape protruding from the sub surface, the outer periphery of the packing is formed by press fitting with a rubber packing having a diameter larger than the take-out inner diameter, so that the take-out port is cylindrical. Since the outlet is sealed in a state where the pressure is evenly applied and the signal lines are wired, workability for ensuring airtightness in the case can be improved. In addition, if the upper lid case has a positioning portion for the crimp terminal connected to the input / output terminal at the mounting portion of the input / output terminal, the crimp terminal can be positioned smoothly and used as a detent during fastening. be able to. In addition, by adopting a configuration in which the main surface has reinforcing ribs and no reinforcing ribs in the central portion of the main surface, that is, by intentionally setting a portion of the upper surface that is easily deformed and a portion that is difficult to deform The portion that is easily deformed even when an excessive load is applied to the case can be deformed to distribute the load, and unlimited deformation can be prevented.

  A sixth aspect of the present invention is a battery pack in which a cylindrical battery is accommodated in a case, the case having an upper lid case and a lower lid case, and the upper lid case and the lower lid case are externally attached. It has a rib, and this outer rib is arranged so that it may go around the upper lid case and the lower lid case. In the sixth aspect, since the outer rib is arranged around the upper lid and the lower lid case, the rigidity of the case increases, so that the thickness of the case itself can be reduced and the case is circulated. Thus, for example, even when a load is applied only to the upper lid case, the reliability of the case can be increased because the structure is dispersed as a load of the entire case and a concentrated load hardly occurs.

  According to the first aspect of the present invention, since the case has a plurality of projecting ribs having a curvature larger than the outer curvature of the cylindrical battery, the operation of housing the cylindrical battery in the case is simplified. It is possible to obtain the effect that the influence on the case and the cylindrical battery at the time of thermal expansion of the cylindrical battery can be suppressed.

  According to the second aspect of the present invention, the case has a protruding rib for locking the both end faces of the cylindrical battery on the inside, and the distance between the ends of the protruding rib is longer than the length between the both end faces of the cylindrical battery. Since it is large, it is possible to easily carry out the operation of housing the cylindrical battery in the case, and it is possible to obtain an effect that the influence on the case and the cylindrical battery at the time of thermal expansion of the cylindrical battery can be suppressed. .

  According to the third aspect of the present invention, the cylindrical battery is accommodated in a case having an upper lid and a lower lid case, and the separation position of the upper lid and the lower lid case is equal to the diameter of the cylindrical battery when the cylindrical battery is accommodated. Half or more is exposed and the depth of the lower lid case is smaller than the radius of the cylindrical battery, so that wiring and electrical connection can be performed safely and efficiently even after the cylindrical battery is accommodated in the lower lid case. The effect that it is possible can be acquired.

  According to the fourth aspect of the present invention, since the lower lid case is divided into the cylindrical battery accommodating portion and the cylindrical battery control circuit board accommodating portion, the control circuit is previously provided before accommodating the cylindrical battery. By attaching the board to the lower lid case, safety and workability can be improved, and the support part protrudes from the inside of the lower lid case, so the mounting position of the control circuit board is clarified. The effect that it can improve property can be acquired.

  According to the fifth aspect of the present invention, the sub-surface is one step lower than the main surface supporting the cylindrical battery on the back side, so that when connecting to the input / output terminal from the outside or taking out the signal line, The tip of the member and the signal line do not protrude from the main surface, the battery pack can be provided with versatility, and the control circuit board etc. is arranged below the back surface of the sub surface, so that the cylinder The structure that separates the part that houses the battery and the part that houses the control circuit board, etc., and even if heat is generated in the cylindrical battery, it is possible to avoid affecting the control circuit board etc. Can be obtained.

  And according to the 6th aspect of this invention, since it arrange | positions so that an outer rib may circulate in an upper cover and a lower cover case, since the rigidity as a case increases, thickness of case itself can be made thin. Since the outer rib is arranged around the case, for example, even when a load is applied only to the upper lid case, the structure is distributed as a load of the entire case and the concentrated load is less likely to occur. The effect that it can raise can be acquired.

  Hereinafter, an embodiment in which the present invention is applied to a battery pack for mounting on an automobile will be described with reference to the drawings.

(Constitution)
As shown in FIG. 1, the battery pack of the present embodiment includes a resin outer case serving as a casing. The exterior case includes an upper lid case 2 that serves as an upper lid of the exterior case and a lower lid case 3 that serves as a lower lid.

  The upper surface of the upper lid case 2 has a substantially horizontal main surface portion 4 that supports a cylindrical battery, which will be described later, on the back surface side, and a sub surface portion 8 that is substantially horizontal and one step lower than the main surface portion 4 and has a smaller area. The main surface portion 4 of the upper lid case 2 has a lattice-shaped reinforcing rib that allows deformation at the central portion when the load is applied to the upper lid case 2 at the peripheral portion excluding the central portion and restricts the deformation at the peripheral portion. 32 is formed.

  Reinforcing ribs are formed on the sub surface portion 8 of the upper lid case 2, and an input / output terminal 6 serving as an external terminal of the battery pack, and a cylindrical portion that penetrates to the back side of the sub surface portion 8 and protrudes upward in a cylindrical shape. 23.

  Further, a plurality of triangular outer ribs 33 extending to the flange portion of the upper lid case 2 that engages with the flange portion of the lower lid case 3 are formed on the side surface of the upper lid case 2 so as to go around the upper lid case 2. ing. The outer rib 33 has a shape in which the outer rib formed on the side surface of the main surface portion 4 is smaller than the outer rib formed on the side surface of the sub surface portion 8. On the other hand, a plurality of inverted triangular outer ribs 34 extending to the flange portion of the lower lid case 3 are also formed on the side surface of the lower lid case 3 so as to go around the lower lid case 3. The outer ribs 33 and 34 are formed at corresponding positions via the flange portions of the upper lid case 2 and the lower lid case 3.

  As shown in FIG. 2, an assembled battery 1 (see FIG. 4) in which four unit cells 9 are connected in series is stored in the exterior case. For the unit cell 9, for example, a cylindrical lithium ion secondary battery that uses lithium manganate or the like as a positive electrode active material, amorphous carbon or the like as a negative electrode active material, and a casing having good thermal conductivity such as stainless steel is used. Can do. The unit cell 9 is covered with a heat-shrinkable insulating tube 10 and has a structure that prevents a short circuit even if the unit cells 9 contact each other on the side surface. The lower lid case 3 has a distance from the inner bottom surface to the flange portion that is smaller than ½ of the diameter of the unit cell 9, and a depth that exposes more than ½ of the diameter of the unit cell 9 when the unit cell 9 is accommodated. have.

  As shown in FIGS. 3 and 4, in the lower lid case 3, a battery housing portion 14 that houses the assembled battery 1 and an IC, a chip resistor, a chip capacitor, and the like are mounted by a partition wall 35 to constitute the assembled battery 1. It is divided into a control circuit board housing portion 15 that houses a control circuit board 5 that measures the battery voltage of each unit cell 9. In relation to the upper lid case 2, the battery housing portion 14 is located below the back surface of the main surface portion 4, and the control circuit board housing portion 15 is located below the back surface of the sub surface portion 8 (see FIG. 5). Note that the control circuit board 5 has notches 7 formed at six locations at the four corners and the central portions on both sides in the longitudinal direction.

  The battery accommodating portions 14 are partitioned at substantially equal intervals by partition walls 36 that are lower than the partition walls 35 in a direction intersecting the partition walls 35. A plurality of support ribs 37 for supporting the side surface of the unit cell 9 are arranged on the partition wall 36. On the inner side surface of the outer lid case 3 of the battery housing portion 14, support ribs 18 for supporting the side surfaces of the unit cells 9 together with the support ribs 37 are formed at positions corresponding to the support ribs 37. On both sides of the support rib 18 and the support rib 37, arc surfaces having a curvature larger than the outer curvature of the unit cell 9 are formed.

  The partition wall 35 has a protruding rib 30 for locking the end face in the longitudinal direction of the unit cell 9 at an intermediate position between the partition walls 36 and an intermediate position of the partition wall 36 and the inner side surface of the outer lid case 3 of the battery housing portion 14. The partition wall 36 protrudes in the extending direction. Further, a protruding rib 30 (not shown) protrudes in the opposite direction at a position corresponding to the protruding rib 30 on the inner side surface of the outer lid case 3 facing the partition wall 35 of the battery accommodating portion 14. The distance between the tips of the opposing protruding ribs 30 is set to be longer than the lengths of both end surfaces of the unit cell 9 in the longitudinal direction.

  On the other hand, a plurality of substrate support protrusions 11 that support the control circuit board 5 are provided in the control circuit board housing portion 14 so as to protrude upward from the inner bottom surface of the lower lid case 3. A part of the substrate support protrusion 11 is formed integrally with the partition wall 35, and the substrate support protrusion 11 has a height higher than that of the partition wall 35. A notch larger than the notch 7 is formed at the tip of the substrate support protrusion 11 at a position corresponding to the notch 7 of the control circuit board 5 described above. Therefore, the distance between the notches 7 is larger than the distance between the notches formed at the tip of the substrate support protrusion 11. The control circuit board 5 is fixed to the substrate support protrusion 11 with a self-tapping screw 12 at a position corresponding to the notch formed at the tip of the substrate support protrusion 11 (see FIG. 4).

  As shown in FIG. 5, a partition wall is formed at a position corresponding to the above-described partition wall 35 on the back side (inside the top cover case 2) of the main surface portion 4 of the upper cover case 2, and the control circuit board is formed by these two partition walls. The housing part 15 is partitioned from the battery housing part 14. Note that the partition in the upper lid case 2 does not have the substrate support protrusions 11 and the portion in contact with the substrate support protrusions 11 is notched (not shown in FIG. 5). It is different from the partition wall 35. In the upper lid case 2, as in the lower lid case 3, support ribs 18 and 37, protruding ribs 30, and a partition wall 36 are formed (part of the illustration of symbols is omitted in FIG. 5).

  Further, the flange portion of the lower lid case 3 is formed with an adhesive groove 29 that goes around the flange portion, and has a structure that fits with a convex portion that goes around the flange portion of the upper lid case 2. ing. The lower lid case 3 is integrally formed with the above-described substrate support protrusion 11, support ribs 18 and 37, protruding ribs 30, partition walls 35 and 36, and flange portions including the adhesive grooves 29 and the outer rib 34. In the case 2, the support ribs 18 and 37, the protruding rib 30, the partition wall 36, the flange portion including the convex portion, and the outer rib 33 are integrally formed.

  As shown in FIGS. 2 and 5, each unit cell 9 constituting the assembled battery 1 is accommodated in a battery accommodating portion 14, and plate-like three nickel battery bus bars 16 are spot-welded and connected to battery terminals. ing. Further, nickel terminal bus bars 17 having a substantially L-shaped cross section are spot-welded to two battery terminals which are terminals of the assembled battery 1. A solder pool part 19 for solder connection is formed at the center of the inter-bus bus bar 16, and the other end of the voltage detection line 13 whose one end is connected to the control circuit board 5 is soldered to the solder pool part 19. . The tip of the voltage detection line 13 connected to the terminal bus bar 17 is pre-soldered to the caulking bed 20, and the caulking bed 20 is press-fitted into a round hole formed in the terminal bus bar 17. These two battery terminals and the control circuit board 5 are connected. It is ideal to use the same material as the terminal bus bar 17 for the cashmere bed 20. However, if the conductive material has a close thermal expansion coefficient, it does not matter so much. In addition, when connecting using a connector or the like, since the rate of occurrence of connection failure increases, in this example, the voltage detection line 13 is directly connected to the control circuit board 5 and also connected to the unit cell 9. Eliminate connector connection.

  As shown in FIGS. 1 and 5, the cylindrical portion 23 has a cylindrical rubber packing having an outer shape larger than the inner diameter of the cylindrical portion 23 and having a communication line 22 for communicating with a host device that controls the battery pack. 21 is press-fitted and fixed to the inner diameter of the cylindrical portion 23. The communication line 22 is led out from the control circuit board 5 and is bound by a stopper 24 on the back side of the sub surface portion 8 so that the specific communication line is pulled from the sub surface portion 8 side and no tension is applied. The stopper 24 is fixed to the back surface of the sub surface portion 8. Further, the communication line 22 is extended and bound to the outside of the upper lid case 2 through the rubber packing 21 and is taken out from the binding outlet 31 fixed to the upper lid case 2. Note that the height of the bundled communication lines 22 is equal to or less than the height of the main surface portion 4.

  In addition, the sub surface portion 8 is formed with a circular opening (see also FIG. 6) and two rectangular holes in the vicinity of the circular opening in the attachment portion of the four input / output terminals 6. On the back surface side of the sub surface portion 8, a shield nut 27 (a caulking nut through which the nut portion does not penetrate) that is caulked and fixed to the front surface side of the sub surface portion 8 through a circular opening is disposed. As shown in FIG. 6, a seal protrusion 28 having a V-shaped or U-shaped cross-section is arranged around the input / output terminal 6 at the connection portion (attachment portion of the shield nut 27) of the input / output terminal 6. Has been. A crimped round terminal is interposed between the input / output terminal 6 and the shield nut 27, and the other end of the input / output line (power cable) 25 led out from the control board circuit 5 is caulked and fixed to the crimped round terminal. Are connected. The crimping round terminal has two fixing pins 26 having a rectangular cross section (is integrally formed), and in order to prevent positioning or detent of the crimping round terminal, the fixing pin 26 is inserted into the rectangular hole described above. Has been inserted.

  As shown in FIGS. 1 and 5, an adhesive is applied to an adhesive groove 29 that circulates around the flange portion of the lower lid case 3, and a convex formed so as to circulate around the flange portion of the upper lid case 2. The battery packs of this embodiment are configured by fitting the parts.

(Assembly procedure)
Next, the assembly procedure of the battery pack of this embodiment will be described.

  First, the control circuit board 5 is placed (inserted) in the notch of the board support protrusion 11 projecting from the control circuit board housing part 14 and fixed with the self-tapping screw 12 (see FIG. 3). Next, the assembled battery 1 in which the inter-cell bus bar 16 and the terminal bus bar 17 are connected in advance to the terminals of the four unit cells 9 by spot welding outside the outer case is inserted into the battery housing portion 14 (see FIG. 4). At this time, it is optimal to apply and insert an adhesive into a portion (curvature portion) of the support ribs 18 and 37 provided on the lower lid case 2 that contacts the unit cell 9.

  Next, the tip of the voltage detection line 13 extended from the control circuit board 5 is soldered to the solder pool portion 19 of the inter-bus busbar 19 (see FIG. 2). At this time, in order to prevent the heat effect on the unit cell 9, it is preferable to perform the work time in a short time. Further, the terminal bus bar 17 of the assembled battery 1 and the voltage detection line 13 led out from the control circuit board 5 are connected using a caulking bed 20.

  Next, the communication line 22 with the rubber packing 21 is attached to the upper lid case 2. The rubber packing 21 is compressed and inserted into the cylindrical portion 23 of the upper lid case 2, and the communication line 22 is a stopper in the upper lid case 2. 23, it fixes to the upper cover case 2 (refer FIG. 5). Thereafter, the input / output lines 25 from the control circuit board 5 are respectively arranged on the fixing pins 26 of the sub surface portion 8, and when crimping the shield nut 27 from the surface of the upper lid case 2, the crimped round terminals are simultaneously crimped and fixed. At this time, since the seal protrusion 28 is arranged at the connection portion of the input / output terminal 6 of the upper lid case 2 so as to go around the arranged input / output terminal 6, the input / output terminal 6 is fixed. The seal protrusion 28 is crushed together with the input / output terminal 6, and the degree of adhesion with the input / output terminal 6 can be improved.

  Then, an adhesive is applied to the portions of the support ribs 18 and 37 of the upper lid case 2 that are in contact with the unit cells 9, and the adhesive is poured into the adhesive grooves 29 of the flange portion of the lower lid case 3 to be fitted to the upper lid case 2. The assembly of the battery pack of this embodiment is completed by drying the adhesive. The assembly process includes a plurality of inspection processes. However, in order to simplify the description, the description of the inspection process is omitted.

(Action etc.)
Next, functions and effects of the battery pack according to the present embodiment will be described.

  The battery pack of this embodiment includes a plurality of support ribs that support the side surface of the unit cell 9 on the inner side (on the back side) of the upper lid case 2 and the lower lid case 3 (hereinafter collectively referred to as an exterior case). 18 and 37 are integrally formed, and the curvature of the portion of the support ribs 18 and 37 that contacts the unit cell 9 is larger than the outer diameter curvature of the unit cell 9. Accordingly, the operation of housing the unit cell 9 in the lower lid case 3 can be easily performed, and even if the unit cell 9 is thermally expanded due to charging or an increase in the outside temperature, the influence on the outer case and the support ribs are increased. It is possible to suppress the influence of a concentrated load on the unit cell 9 that works by reacting from 18 and 37. Further, the support ribs 18 and 37 formed on the inner side of the upper lid case 2 are supported (pressed) from the upper side, and an adhesive is applied to the portions of the support ribs 18 and 37 of the outer case that contact the unit cells 9. Thus, the movement of the unit cell 9 can be eliminated.

  Furthermore, the battery pack according to the present embodiment has protruding ribs 30 for locking both end surfaces of the unit cell 9 inside the outer case, and the distance between the tips of the protruding ribs 30 is between the both end surfaces of the unit cell 9. Greater than the length of Therefore, it is possible to easily perform the operation of housing the unit cell 9 in the lower lid case 3 and to suppress the influence on the outer case and the unit cell 9 when the unit cell 9 is thermally expanded.

  The battery pack of the present embodiment uses a resin outer case. Inside the lower lid case 3, the substrate support protrusion 11, the support ribs 18, 37, the protruding rib 30, and the partition walls 35, 36 are the lower lid. The upper cover case 2 is integrally formed with the support ribs 18 and 37, the protruding ribs 30, and the partition walls 35 and 36. The upper cover case 2 is formed integrally with the upper cover case 2. Since the members integrally formed in these exterior cases prevent the inside of the (side) frame from falling down when the exterior case is formed, the formation accuracy of the exterior case can be improved.

  Furthermore, in the battery pack of this embodiment, when the lower lid case 3 accommodates the unit cell 9, it has a depth that exposes at least half the diameter of the unit cell 9. Therefore, since the depth of the lower cover case 3 is smaller than the radius of the unit cell 9, wiring and electrical connection can be performed safely and efficiently even after the unit cell 9 is accommodated in the lower cover case 3.

  Furthermore, in the battery pack of this embodiment, the lower lid case 3 has a battery housing portion 14 and a control circuit board housing portion 15, and the control circuit board 5 protrudes inside the lower lid case 3 by a self-tapping screw 12. It is fixed to the provided substrate support protrusion 11. Since the lower lid case 3 is divided into the battery housing part 14 and the control circuit board housing part 15 by the partition wall 35, the control circuit board 5 is preliminarily placed before the unit cell 9 to the assembled battery 1 are housed in the battery housing part 14. By attaching to the lower lid case 3, safety and workability can be improved in assembling the battery pack, and the substrate support protrusion 11 protrudes from the inner side of the lower lid case 3. The mounting position of the circuit board 5 is clarified and workability can be improved (see FIGS. 3 and 4).

  In addition, the battery case 14 and the control circuit board accommodation part 15 are partitioned by the partition case 35 integrally formed on the back surface side of the upper lid case 2 and the inner side of the lower lid case 3 in the outer case. (Separated), when an accident occurs in any of the single cells 9 accommodated in the battery accommodating portion 14 (at the time of abnormality), the control circuit substrate 5 fixed and accommodated in the control circuit substrate accommodating portion 15 A time lag until damage is received can be generated, and a danger signal can be transmitted to the host device on the vehicle side via the communication line 22 during that time, so that safety in using the battery pack can be ensured. .

  Furthermore, in the battery pack of this embodiment, the notches 7 are formed at the four corners of the control circuit board 5 and the central portions on both sides in the longitudinal direction, and the notches 7 are formed at positions corresponding to the notches 7 at the tips of the substrate support protrusions 11. Larger notches are formed, and the distance between the notches 7 is larger than the distance between the notches formed at the tip of the substrate support protrusion 11. Therefore, even if thermal expansion occurs in the lower lid case 3 due to heat generation of the unit cell 9, the influence of thermal expansion can be reduced, and when the control circuit board 5 is inserted or disposed at the tip of the board support protrusion 11. The control circuit board 5 can be easily inserted into the tip of the board support protrusion 11, and both workability and safety can be improved.

  Further, in the battery pack of the present embodiment, the upper surface of the upper lid case 2 includes a main surface portion 4 having support ribs 18 and 37 that support the side surfaces of the unit cells 9 on the back surface, and a sub surface portion that is one step lower than the main surface portion 4 and has a smaller area. 8, and the input / output terminal 6 and the cylindrical portion 23 for taking out the communication line 22 are arranged on the sub surface portion 8. Since the sub surface portion 8 is one step lower than the main surface portion 4 supporting the unit cell 9 on the back side, when connecting the connection line or the like from the outside of the outer case to the input / output terminal 6 or when taking out the communication line 22, the bolt For example, the front end of the connecting member or the communication line 22 does not jump out from the main surface portion 4, and for example, it can be placed in an engine room where various vehicle members are arranged, or a battery pack is stacked. The battery pack can be provided with versatility such as use.

  Further, in the battery pack according to the present embodiment, the input / output terminal 6 having the seal projection 28 disposed around the connection portion of the input / output terminal 6 of the upper lid case 2 is arranged around the input / output terminal 6. In doing so, the seal projection 28 is crushed together with the input / output terminal 6, and the degree of adhesion with the input / output terminal 6 can be improved. Accordingly, a sealing material such as rubber packing is not required, and sealing is possible when the terminals are connected, so that the number of assembling steps is reduced and the working efficiency is improved.

  The rubber packing 21 is press-fitted into the cylindrical portion 23, and the communication line 22 is fixed by the stopper 23 on the back side of the sub surface portion 8. The cylindrical portion 23 has a cylindrical shape, and the outer periphery of the rubber packing 21 is evenly pressurized and the cylindrical portion 23 is sealed in a state in which the communication line 22 is wired. Therefore, workability for ensuring airtightness in the outer case is improved. Can be improved.

  Furthermore, since the rectangular hole portion for positioning the crimping round terminal connected to the input / output terminal 6 is formed in the attachment portion of the input / output terminal 6 of the sub surface portion 8 of the upper lid case 3, the positioning of the crimping round terminal is smoothly performed. In addition, the rotation can be prevented during fastening and when the battery pack is used, and fatigue breakage of the input / output line 25 can be prevented.

  Furthermore, in the battery pack of the present embodiment, the main surface portion 4 has a rectangular reinforcing rib 32 and the central portion of the main surface portion 4 does not have the reinforcing rib 32. Therefore, the main surface portion 4 is easily deformed. A portion and a portion that is difficult to deform are set, and the outer case, in particular, the portion that is easily deformed even when an excessive load is applied to the upper lid case 2 can be deformed to disperse the load, and the periphery of the main surface portion 4 Unrestricted deformation of the upper lid case 2 can be prevented by the reinforcing ribs 32 formed on the top.

  And in the battery pack of this embodiment, the upper cover case 2 has the outer rib 33, the lower cover case 3 has the outer rib 34, and these outer ribs 33 and 34 go around the exterior case. It is formed integrally with the outer case. Moreover, since the positions of the outer ribs 33 and 34 are made to correspond via the flange portion, the rigidity of the outer case can be increased. For this reason, the thickness of the exterior case itself can be reduced. Further, since the outer ribs 33 and 34 are arranged so as to circulate around the outer case, for example, even if a load is applied only to the upper lid case 2, it is dispersed as a load of the entire outer case and a concentrated load hardly occurs. Can improve the reliability.

  In the present embodiment, an example in which a lithium ion secondary battery is used as the unit cell 9 and four unit cells 9 are connected in series has been described. However, the present invention is not limited to this, and the unit cell 9 includes nickel metal hydride. Various batteries including a battery can be used, and a plurality of unit cells 9 may be connected in parallel or in series and parallel to form the assembled battery 1.

  Further, in this embodiment, the control circuit board 5 in which the notches 7 are formed at the four corners and the six central portions on both sides in the longitudinal direction is illustrated. However, the present invention is not limited to this, and the notch of the board support protrusion 11 ( A notch may be formed corresponding to (). In this case, it is preferable to determine the number and position of the substrate support protrusions 11 in relation to the center of gravity of the control circuit board 5.

  Further, in the present embodiment, the lattice-shaped reinforcing ribs 32 are exemplified on the peripheral edge portion of the main surface portion 4 and the triangular outer ribs 33 and 34 are provided around the outer case, but the shape of these ribs is limited to the above embodiment. For example, a radial reinforcing rib or a trapezoidal outer rib may be used.

  Since the battery pack of the present invention can be safely and efficiently assembled and wired, it contributes to manufacturing and can be used industrially.

It is an external appearance perspective view of the battery pack of embodiment which can apply this invention. It is an external appearance perspective view which shows the state by which the assembled battery and the control circuit board were accommodated in the lower cover case of the battery pack of embodiment. It is an external appearance perspective view which shows the state before an assembled battery and a control circuit board are accommodated in the lower cover case of the battery pack of embodiment. It is an external appearance perspective view which shows the state before a control circuit board is accommodated in the lower cover case of the battery pack of embodiment, and an assembled battery is accommodated. It is an external appearance perspective view which shows the state before attaching an upper cover case to the lower cover case of the battery pack of embodiment. It is a perspective view which shows partially the input-output terminal attachment part of the back side of the sub surface part of the battery pack of embodiment.

Explanation of symbols

2 Upper lid case 3 Lower lid case 4 Main surface (main surface)
5 Control circuit board 6 I / O terminal 7 Notch (board notch)
8 Sub surface (Sub surface)
9 Single battery (cylindrical battery)
11 Substrate support protrusion (support part)
14 Battery housing portion 15 Control circuit board housing portion 18 Support rib (projecting rib)
22 Communication line (signal line)
23 Cylindrical part (outlet)
28 Seal protrusion (protrusion)
30 protruding ribs 32 reinforcing ribs 33, 34 outer ribs 37 supporting ribs (projecting ribs)

Claims (11)

  A battery pack containing a cylindrical battery in a case, the battery pack having a plurality of projecting ribs for supporting a side surface of the cylindrical battery inside the case and contacting the cylindrical battery of the projecting ribs A battery pack, wherein the curvature of the portion is larger than the outer diameter curvature of the cylindrical battery.   A battery pack in which a cylindrical battery is accommodated in a case, the battery pack having projecting ribs for engaging both end faces of the cylindrical battery inside the case, and a distance between tips of the projecting ribs A battery pack characterized by being larger than the length between both end faces.   A battery pack containing a cylindrical battery in a case, wherein the case has an upper lid case and a lower lid case, and the lower lid case accommodates the cylindrical battery when the cylindrical battery is accommodated. A battery pack characterized by having a depth at which half or more of the diameter is exposed.   A battery pack in which a cylindrical battery is accommodated in a case, wherein the case has an upper lid case and a lower lid case, and the lower lid case includes an accommodating portion for the cylindrical battery and an accommodating portion for a control circuit board. The battery pack is characterized in that the control circuit board is fixed to a support portion projecting from the inside of the lower lid case.   The control circuit board is formed with a plurality of board cutouts, and a notch larger than the board cutout is formed at the tip of the support portion at a position corresponding to the board cutout. The battery pack according to claim 4, wherein a distance between the notches is greater than a distance between notches formed at a tip of the support portion.   A battery pack containing a cylindrical battery in a case, wherein the case has an upper lid case and a lower lid case, and the upper surface of the upper lid case has a plurality of surfaces that support the side surface of the cylindrical battery on the back side. A main surface having protruding ribs and a sub surface that is one step lower than the main surface and smaller in area than the main surface, and an input / output terminal and an outlet for taking out a signal line are disposed on the sub surface. A battery pack characterized by   7. The battery pack according to claim 6, wherein the upper lid case has a protruding portion having a V-shaped or U-shaped cross-section around the input / output terminal at a portion where the input / output terminal is attached.   The battery pack according to claim 6, wherein the outlet has a cylindrical shape that penetrates the upper lid case and protrudes from the sub surface.   The battery pack according to claim 6, wherein the upper lid case includes a positioning portion for a crimp terminal connected to the input / output terminal at an attachment portion of the input / output terminal.   The battery pack according to claim 6, wherein the main surface has a reinforcing rib, and the central portion of the main surface does not have the reinforcing rib.   A battery pack containing a cylindrical battery in a case, the case having an upper lid case and a lower lid case, the upper lid case and the lower lid case having a plurality of outer ribs, the outer ribs being A battery pack, wherein the battery pack is arranged so as to go around the upper lid case and the lower lid case.