JP5449861B2 - Pack battery - Google Patents

Description

  In the present invention, a plurality of batteries are held at a fixed position by a battery holder, and further, a circuit board is held at a fixed position by a substrate holder to form a battery core pack, and the core pack of the battery is stored in an outer case. It relates to a battery pack.

  A battery pack containing a large number of batteries is placed in a fixed position by a battery holder and stored in an outer case. In addition, a battery pack containing a circuit board to be connected to the battery is placed in a fixed position by a board holder and built in an outer case. In this battery pack, a circuit board on which a battery protection circuit is mounted is fixed to a battery holder and housed in an outer case as a battery core pack. The battery pack having this structure can be used safely by controlling charging and discharging while detecting the voltage of each battery on the circuit board, thereby preventing overcharging and overdischarging of the battery. In addition, the battery life can be extended. As described above, a battery pack in which a large number of batteries are arranged at a fixed position by a battery holder and charging / discharging is controlled while detecting the voltage of each battery is used for applications requiring a large output, such as an assist bicycle, electric Ideal for power supplies for motorcycles and power tools.

  A battery pack having this structure is described in Patent Document 1. As shown in the perspective view of FIG. 1 and the plan view of FIG. 2, the battery pack is a battery core pack 110 in which a circuit board 106 is fixed to a battery holder 102 that holds a large number of batteries. 110 is housed in an exterior case (not shown). In the battery pack having this structure, the battery and the circuit board 106 are arranged at fixed positions of the battery holder 102, and the lead plates 105 arranged on both surfaces of the battery holder 102 are connected to the circuit board 106. The circuit board 106 is mounted with a protection circuit that detects the voltage of each battery and controls charge / discharge. The protection circuit prevents overcharging and overdischarging of the battery by controlling charging and discharging while detecting the voltage of each battery. The circuit board 106 is mounted with a protection circuit that detects the state of the battery and controls the charging current and the discharging current so that the battery is not overcharged or overdischarged. For example, in the state of discharging, this protection circuit cuts off the discharge current when any of the battery voltages becomes lower than the lowest voltage and is overdischarged. In the state of being charged, a circuit that cuts off the charging current is mounted when the voltage of any battery being charged becomes higher than the maximum voltage and the battery is overcharged. This protection circuit allows the battery to be charged / discharged when the battery voltage is within the set range and the battery is overcharged or not overdischarged.

JP 2007-317579 A

  The protection circuit that detects the voltage of the battery and controls charging / discharging controls the charging / discharging current from the voltage detection circuit for detecting the voltage of each battery and the battery voltage detected by the voltage detection circuit. Implement the circuit. A semiconductor switching element such as a power MOSFET is used as a switching element for controlling charge / discharge of the battery. Furthermore, when the charge / discharge current of the battery pack increases, a large semiconductor switching element is used, and further, a large semiconductor switching element is connected in parallel. When the number of batteries stored in multiple stages and multiple rows increases and the output of the battery pack increases, a large electronic component is used for the protection circuit of the circuit board, and the number increases. When the electronic components to be mounted on the circuit board are increased, it is necessary to enlarge the circuit board. However, as shown in FIGS. 1 and 2, the battery pack 102 in which the lead plates 105 are arranged on both side surfaces of the battery holder 102 and the lead plates 105 are connected to the circuit board 106 from both side edges of the circuit board 106 is a circuit. The width of the substrate 106 is restricted. This is because the width of the circuit board 106 cannot be made longer than the total length of the battery. Since it is important to increase the capacity and reduce the outer shape of the battery pack, the width of the circuit board cannot be made longer than the total length of the battery. It is extremely difficult to mount all the electronic components that realize the protection circuit on the circuit board. In particular, in the structure where lead plates are arranged on both side edges and all the lead plates are connected to the circuit board, all the circuits that realize the protection circuit on the circuit board whose width is restricted by the length of the battery. It becomes extremely difficult to mount electronic components. In the structure for connecting each lead plate to the circuit board, as shown in FIG. 2, it is necessary to dispose connection leads 121 for connecting the lead plate 105 to the circuit board 106 on both sides of the circuit board 106. It is necessary to arrange an electronic component that realizes a protection circuit between them. That is, since the electronic component that realizes the protection circuit is mounted between the connection leads 121 wired on both sides of the circuit board 106, the area where the electronic component can be mounted is limited by the connection lead 121. Therefore, in order to arrange all the electronic components that realize the protection circuit, it is necessary to widen the width of the circuit board, and the wide circuit board has a problem of increasing the outer shape of the battery pack.

  The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is to mount the electronic components of the protection circuit for detecting each battery voltage without increasing the width of the circuit board connecting the lead plates on both side edges, and to make the outer shape with respect to the charging capacity compact. It is to provide a battery pack.

Means for Solving the Problems and Effects of the Invention

The battery pack according to the present invention is a battery holder in which a plurality of batteries 1 having positive and negative end electrodes at both ends are arranged in parallel to each other, and end electrodes at both ends are arranged on the same surface and arranged in multiple rows and columns 2 and a lead plate 5 connected to the end electrode of the battery 1 housed in the battery holder 2 and connecting the adjacent batteries 1 in series and in parallel, and connected to the lead plate 5 And a circuit board 6. In the battery pack, a battery holder 2 holds a plurality of batteries 1 in place, and a circuit board 6 is connected to the battery holder 2 to form a battery core pack 10. The core pack 10 is stored in an outer case 4. ing. Furthermore, the battery pack has all the following configurations.
(A) The circuit board 6 has fixed on its surface an electronic component that realizes a protection circuit that detects the voltage of each battery 1 and controls charging and discharging of the battery 1.
(B) The battery holder 2 houses the battery 1 so that the end electrodes are exposed on both side surfaces of the battery holder 2, connects the lead plate 5 to the end electrodes exposed from the battery holder 2, and faces the lead plate 5. It is arranged on both sides.
(C) The circuit board 6 is connected to the battery holder 2 in such a posture that both side edges thereof are arranged on both side surfaces of the battery holder 2, and each lead plate 5 arranged on both side surfaces of the battery holder 2 It extends inward from both side edges of the substrate 6 and is connected to a predetermined position.
(D) The lead plate 5 includes an output lead plate 5X connected to the output terminal, and an intermediate lead plate 5Y connecting the batteries 1 arranged in multiple stages and multiple rows in series and in parallel.
(E) The output lead plate 5 </ b> X and the intermediate lead plate 5 </ b> Y include connection tabs 5 </ b> A that are connected to the circuit board 6 at end portions that approach the circuit board 6.
(F) The intermediate lead plate 5Y includes a plurality of connection tabs 5A at predetermined intervals at the end thereof, and any of the connection tabs 5A is connected to the circuit board 6.

  The above battery packs can be compact in size with respect to the charging capacity by mounting the electronic components of the protection circuit that detects each battery voltage without increasing the width of the circuit board connecting the lead plates from both side edges. There are features. This is because the above battery pack can be provided with a plurality of connection tabs at the end portion of the lead plate, and the connection tabs to be connected to the circuit board can be selected to widen the area for mounting large electronic components. For example, in a battery pack, a large semiconductor switching element such as a power MOSFET is connected in parallel and mounted on a circuit board in order to control a large current. The semiconductor switching elements are arranged close to each other because their characteristics change with temperature and shorten the path of a large current for parallel connection. Circuit boards that place large electronic components next to each other require a large area to place these parts, but circuit boards that connect connection leads from both side edges are connected on both sides. The area where the lead places electronic components is limited. Since the battery pack of the present invention has a plurality of connection tabs on the lead plate connected to both side edges of the circuit board, the connection lead position can be changed by connecting the connection lead to the optimal connection tab. It is possible to secure a wide area for arranging large parts. For this reason, it is not necessary to widen the circuit board in order to arrange large parts, and large parts can be effectively mounted on a narrow circuit board. For this reason, it is not necessary to enlarge the circuit board to enlarge the outer shape of the battery pack, and the outer shape can be made compact.

In the battery pack of the present invention, the intermediate lead plate 5Y is provided with two rows of connection tabs 5A protruding from the end portion, and is one connection tab 5A that is disposed close to the opposing positions on both sides of the circuit board 6. The connection tab 5A to be connected can be connected to the circuit board 6.
The battery pack described above can widen an area for placing a large electronic component by selecting one of the two rows of connection tabs and connecting it to the circuit board.

In the battery pack of the present invention, the intermediate lead plates 5Y disposed on both side surfaces of the battery holder 2 can have the same shape.
This battery pack can secure a wide area for mounting large components on a circuit board while using lead plates of the same shape. For this reason, the width of the circuit board can be narrowed, that is, the outer shape can be made compact, while reducing the manufacturing cost.

  In the battery pack of the present invention, the battery holder 2 protrudes to the outer periphery of both side surfaces, and has a pair of support side walls 12 having a predetermined width at the opening edge, and the circuit board 6 is interposed between the pair of support side walls 12. Can be arranged. Further, the pair of support side walls 12 are provided on the outer periphery thereof with a contact plate portion 12A that is in surface contact with the inner surface of the outer case 4, and the contact plate portion 12A is brought into contact with the inner surface of the outer case 4 so as to contact the core pack 10 of the battery. Can be accommodated in the outer case 4, and the support side wall 12 can be provided with a slit 19 through which the circuit board 6 can pass.

  This battery pack can be arranged by inserting a circuit board wider than the inner width of the contact plate portion between the pair of supporting side walls. Therefore, by increasing the width of the contact plate portion, the width of the circuit board can be increased while the battery holder is in contact with the inner surface of the outer case with a large area. The structure that widens the width of the contact plate can prevent damage to the side wall due to the strong impact of the outer case, and if the battery core pack is put in the bag and stored in the outer case, the bag can also be damaged. Can be prevented.

In the battery pack of the present invention, the battery holder 2 can arrange the batteries 1 in one row in a zigzag shape.
This battery pack can be made more compact by narrowing the interval between batteries arranged in multiple stages and multiple rows.

  The battery pack of the present invention can be mounted with a semiconductor switching element in which a protection circuit mounted on the circuit board 6 is controlled to be turned on and off to control the battery current.

  The battery pack of the present invention can connect the circuit board 6 to the battery holder 2 via the board holder 7. The substrate holder 7 is provided with a peripheral wall 52 around the bottom plate 51 to form a box shape with an upper opening. The substrate holder 7 houses the circuit board 6 inside the peripheral wall 52 and is filled with the insulating resin 14 inside the peripheral wall 52. The substrate 6 can be embedded in the insulating resin 14. Further, the substrate holder 7 can be provided with a support rib 54 protruding inward from the bottom plate 51, and the circuit board 6 can be fixed to the upper surface of the support rib 54. The support rib 54 has a planar shape that follows the outer shape of the circuit board 6 and is smaller than the outer shape of the circuit board 6, and the upper opening of the support rib 54 is closed by the circuit board 6. A closed space 50 can be provided in the space.

  The battery pack described above is characterized in that the manufacturing cost can be reduced by reducing the amount of insulating resin filled in the substrate holder. It is possible to pot the circuit board without filling the closed space with the insulating resin by setting the closed space closed by the loop-shaped support rib protruding from the bottom plate of the board holder and the circuit board as a region not filled with the insulating resin. Because. In particular, this battery pack does not need to be filled with an insulating resin in a narrow space formed between the bottom plate of the substrate holder and the circuit board as in the prior art, so that there are restrictions on the distance and arrangement between the substrate holder and the circuit board. In addition, the time for filling the insulating resin can be shortened, and the time taken for the filled insulating resin to cure can be shortened to realize the feature of efficient mass production.

The battery pack of the present invention can connect the circuit board 6 to the battery holder 2 via the board holder 7. The substrate holder 7 can accommodate the circuit board 6 inside the peripheral wall 52 by providing a peripheral wall 52 around the bottom plate 51 to form a box shape with an upper opening. Further, in the battery pack, the circuit board 6 projects and fixes the connection leads 21 connected to the connection tabs 5A of the lead plate 5 from both sides of the board holder 7, and the board holder 7 extends from both sides to the outside. A protective rib 59 protruding in the outer peripheral direction of the peripheral wall 52 can be provided adjacent to the protruding connection lead 21.
Since the above battery pack is provided with protective ribs protruding in the outer peripheral direction of the peripheral wall adjacent to the connection leads protruding outward from both sides of the substrate holder, the connection leads protruding outward in the manufacturing process etc. The protective rib prevents the direct contact with the outside and effectively prevents the connection lead from being damaged or deformed.

It is a perspective view of the core pack of the battery of the battery pack previously applied by the present applicant. It is a top view of the core pack of the battery shown in FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention. FIG. 4 is an exploded perspective view of the battery pack shown in FIG. 3. FIG. 4 is a horizontal sectional view of the battery pack shown in FIG. 3. FIG. 6 is a vertical longitudinal sectional view of the battery pack shown in FIG. 3, corresponding to a cross section taken along line VI-VI in FIG. 5. FIG. 6 is a vertical longitudinal sectional view of the battery pack shown in FIG. 3, corresponding to a cross section taken along line VII-VII in FIG. 5. It is the perspective view which looked at the core pack of the battery of the battery pack shown in FIG. 4 from the opposite side. It is a disassembled perspective view of the core pack of the battery shown in FIG. It is a right view of the core pack of the battery shown in FIG. It is a left view of the core pack of the battery shown in FIG. It is the XII-XII sectional view taken on the line of the battery core pack shown in FIG. It is the XIII-XIII sectional view taken on the line of the battery core pack shown in FIG. It is a front view of an intermediate lead plate. It is a perspective view which shows the state which inserts a board | substrate holder in a battery holder. It is a disassembled perspective view of a substrate holder and a circuit board. FIG. 17 is a rear perspective view of the substrate holder and the circuit board shown in FIG. 16. It is a perspective view which shows the state which inserts the core pack of the battery shown in FIG. 8 in a waterproof bag. It is a perspective view which shows the state which inserted the core pack of the battery shown in FIG. 8 in the waterproof bag. It is a perspective view which shows the state which pulls out the lead wire of the core pack of a battery shown in FIG. 19 from a waterproof bag. It is a perspective view which shows the state which has arrange | positioned the lead wire withdraw | derived from the waterproof bag in the drawer space.

  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. 3 to 7 includes a battery core pack 10 connecting a plurality of batteries 1, and an outer case 4 housing the core pack 10. In this battery pack, a battery core pack 10 is placed in a waterproof bag 3 and stored in an outer case 4. In this battery pack, the battery core pack 10 has a waterproof structure with the waterproof bag 3, so that the battery 1 can be protected from water entering the interior from the exterior case 4. Moreover, this battery pack can improve the impact strength by absorbing the impact of the outer case 4 by using the waterproof bag 3 as the cushion material 30. However, in the battery pack of the present invention, it is not always necessary to place the battery core pack in a waterproof bag and store it in the outer case.

  As shown in FIGS. 8 to 13, the battery pack of these figures includes a battery holder 2 in which a plurality of batteries 1 arranged in a multistage multi-row are arranged in a fixed position, and each battery 1. And a circuit board 6 connected via a lead plate 5 connected to the end electrode. Further, the core pack 10 of the battery shown in the figure includes a substrate holder 7 that places the circuit substrate 6 in a fixed position. A substrate holder 7 is connected to the battery holder 2, which is connected to the battery holder 2, and the circuit board 6 is arranged at a fixed position of the battery holder 2.

  The battery 1 is a rechargeable lithium ion secondary battery. However, the battery may be any rechargeable battery such as a nickel metal hydride battery or a nickel cadmium battery. Further, in the illustrated battery pack, the battery 1 is a cylindrical battery, but may be a square battery. The battery core pack 10 is stored in the battery holder 2 in a multistage multi-row arrangement with the batteries 1 in a parallel posture. In the battery pack of FIG. 6 and FIG. 9, 10 batteries 1 are arranged in one stage, arranged in four stages, and 40 batteries 1 are stored in the battery holder 2. In the battery holder 2, the end electrodes of the battery 1 are arranged and exposed on the same surface on both sides, and the lead plate 5 is connected at the exposed portion. In the illustrated battery pack, batteries arranged in the same stage, that is, 10 batteries 1 are connected in series, batteries arranged in the same row, that is, batteries 1 arranged in four rows up and down are arranged in parallel. Connected. Therefore, the battery pack shown in the figure has ten batteries 1 connected in series and four batteries 1 connected in parallel. The battery pack of the present invention does not specify the number of batteries arranged in multiple stages and multiple rows, but by arranging the batteries in four or more stages, the number of batteries connected in parallel can be increased to increase the output current, Further, the output voltage can be increased by increasing the number of batteries arranged in one stage and increasing the number of batteries connected in series. Therefore, the output power can be increased by increasing the number of batteries arranged in multiple stages and multiple rows.

  The plurality of batteries 1 are connected in series and in parallel to each other by welding lead plates 5 to end electrodes exposed on both sides of the battery holder 2. In the core pack 10 of FIGS. 8 to 13, each lead plate 5 is connected to a circuit board 6 disposed on the upper part of the battery holder 2 in the figure. The circuit board 6 is connected to the battery holder 2 in such a posture that both side edges are arranged on both side faces of the battery holder 2, and the lead plates 5 arranged on both side faces of the battery holder 2 are connected to the circuit board 6. It connects with the predetermined position via the connection lead 21 extended inside from a both-sides edge.

  The lead plate 5 includes an output lead plate 5X connected to the output terminal and an intermediate lead plate 5Y connecting the batteries 1 arranged in multiple stages and multiple rows in series and in parallel. The output lead plate 5X is connected to a row of batteries 1 arranged vertically, and the batteries 1 arranged in four stages are connected in parallel and connected to the output terminals. In the illustrated core pack, since the batteries 1 arranged in four stages are connected in parallel, the four batteries 1 arranged in one row are connected to one output lead plate 5X.

  The intermediate lead plate 5Y is connected to two rows of batteries 1 arranged adjacent to each other, and connects adjacent batteries 1 in the same stage in series and batteries 1 arranged in upper and lower stages in parallel. In the illustrated core pack, two rows of batteries 1 arranged in four stages are connected in series, so that eight batteries 1 are connected to one intermediate lead plate 5Y. In the illustrated battery pack, the intermediate lead plates 5Y arranged on both side surfaces of the battery holder 2 have the same shape. By using the intermediate lead plate 5Y having the same shape, the manufacturing cost can be reduced.

  The lead plate 5 consisting of the output lead plate 5X and the intermediate lead plate 5Y is provided with a connection tab 5A connected to the circuit board 6 at the end approaching the circuit board 6 and at the upper end in FIGS. Protrusively provided. Since the output lead plate 5X is connected to the battery 1 in one row, one connection tab 5A is provided. Since the intermediate lead plate 5Y is connected to the two rows of batteries 1, the width of the intermediate lead plate 5Y is double that of the output lead plate 5X. Therefore, as shown in FIG. 14, two rows of connection tabs 5A are provided at the upper end. Yes. The lead plate 5 shown in the figure is provided with two rows of connection tabs 5A, but it is also possible to provide three or more rows of connection tabs. The output lead plate can also be provided with a plurality of connection tabs.

  The connection tab 5 </ b> A is connected to the circuit board 6 by soldering the connection leads 21 that are connected at one end. The connection tab 5 </ b> A is provided with a slit 5 a that guides the connection lead 21. Since this connection tab 5A can be connected by inserting the connection lead 21 into the slit 5a and soldering, it can be connected so that the connection lead 21 does not come off firmly. The connection lead 21 having one end connected to the connection tab 5A is inserted into a through hole (not shown) of the circuit board 6 and connected by soldering. The connection lead 21 can easily connect the connection tab 5A to the circuit board 6 using a single metal wire. However, it is also possible to use a lot of thin lines and litz wires. In the illustrated battery pack, the lead plate 5 is connected to the circuit board 6 via the connection leads 21, but the connection tab of the lead board is bent inside the circuit board, and the connection tab is directly attached to the circuit board. It can also be connected.

  The circuit board 6 is connected to each battery 1 via a lead plate 5 including an output lead plate 5X and an intermediate lead plate 5Y. The circuit board 6 is mounted with a protection circuit that detects each battery voltage and controls the charge / discharge current. The protection circuit includes a semiconductor switching element that controls the charge / discharge current of the battery 1. This protection circuit cuts off the discharge current by switching off the semiconductor switching element that cuts off the discharge current when any battery voltage becomes lower than the minimum voltage. When any of the battery voltages becomes higher than the maximum voltage, the semiconductor switching element that stops charging is switched off to stop charging. As described above, the battery pack in which the protection circuit that controls charging / discharging by detecting each battery voltage is mounted can be used safely while protecting the battery 1. In particular, a battery pack in which the battery 1 is a lithium ion battery can improve safety by detecting the battery voltage and controlling the charge / discharge current. Furthermore, the protection circuit mounted on the circuit board 6 can further improve safety by detecting the remaining capacity of the battery 1 and controlling charging / discharging with the remaining capacity. Further, the protection circuit for detecting the remaining capacity can display the remaining capacity to be detected by a light emitting diode or the like.

  In order to connect the end electrodes of all the batteries 1 to the circuit board 6 and detect the respective battery voltages, the connection tabs 5A of all the lead plates 5 are connected to the circuit board 6. In the illustrated battery pack, the lead plates 5 are arranged on both side edges of the substrate holder 7. Therefore, the lead plates 5 are arranged on both sides of the circuit board 6, and each lead plate 5 is connected to the circuit via the connection leads 21. It is connected to the substrate 6. The connection leads 21 are wired so as to extend inward from both sides of the circuit board 6, and their tips are connected to predetermined positions on the circuit board 6. The connection leads 21 arranged on both sides of the circuit board 6 limit the arrangement area 60 of the electronic components mounted on the surface of the circuit board 6. Since the conventional lead plate 105 shown in FIG. 1 is provided with one connection tab 105A at the center, the right connection lead 121 and the left connection lead 121 are connected to both sides of the circuit board 106 as shown in FIG. The right connection lead 121 is arranged in the middle of the left connection lead 121, and the left connection lead 121 is arranged in the middle of the right connection lead 121. For this reason, as shown by the chain line in FIG. 2, the width of the arrangement region 160 formed between the connection leads 121 is narrow. On the other hand, the battery pack of the present invention has a structure in which the connection leads 21 can be arranged on both sides of the circuit board 6 by selecting the connection tab 5A to which the connection leads 21 are connected. For example, as shown in FIG. 12, the right side connection lead 21 and the left side connection lead 21 are arranged at opposing positions on both sides of the circuit board 6, so that the connection leads 21 are provided on both sides as shown by the chain line in the figure. Can be provided, and there is no need to arrange electronic components in a narrow arrangement region 160 formed between the left and right connection leads 121 as in the prior art. As described above, the structure in which the connection leads 21 are arranged at opposite positions on both sides of the circuit board 6 can widen the lateral width of the arrangement region 60 provided between the adjacent connection leads 21. For this reason, electronic components such as a large semiconductor switching element can be arranged without increasing the width of the circuit board 6.

  As shown in FIGS. 9 and 13, the battery holder 2 is formed by integrally forming support side walls 12 at both ends of a holding cylinder 11 through which the battery 1 is inserted and held. In the battery holder 2, a holding cylinder 11 is provided on the inner side of the pair of supporting side walls 12 that are opposed to each other, thereby forming a battery storage unit 40. The battery 1 is put in the holding cylinder 11, and the battery 1 is held at a fixed position. The battery holder 2 is manufactured by molding an insulating material. The insulating material forming the battery holder 2 is plastic. The holding cylinder 11 is provided through a plurality of insertion holes 13 through which the battery 1 is inserted. The battery holder 2 inserts the battery 1 into the insertion hole 13 of the holding cylinder 11 and holds the plurality of batteries 1 at predetermined positions. Since the battery holder 2 shown in the figure connects and holds 40 cylindrical batteries 1, 40 insertion holes 13 are provided in the holding cylinder 11. Forty insertion holes 13 are arranged in four stages, and ten are provided in each stage. Further, in the holding cylinder 11 shown in the figure, another battery 1 is arranged between the valleys of the batteries 1 arranged adjacent to each other, and the batteries 1 arranged in a plurality of stages are arranged in a stacked state. ing.

  The battery holder 2 shown in FIGS. 9 and 13 has a holding cylinder 11 divided into two in the middle in the axial direction, and is integrally formed and connected to a pair of support side walls 12. The end portion of the divided holding cylinder 11 is molded into a shape that is connected to the inside of the support side wall 12. In the battery holder 2, the battery 1 is inserted into the battery holder 2 by connecting the pair of support side walls 12 by inserting the opening 1 that is the divided end of the holding cylinder 11 into the insertion hole 13. .

  As shown in FIG. 9, the holding cylinder 11 opens the insertion hole 13 in a cylindrical shape along substantially the entire circumference of the surface of the battery 1. However, the holding cylinder does not necessarily need to open the insertion hole in a cylindrical shape along the entire circumference of the battery. Furthermore, the battery holder 2 shown in FIG. 9 is provided with an opening 11 </ b> A in a part of the holding cylinder 11. The illustrated battery holder 2 is provided with an opening 11A by notching the opening end of one of the divided holding cylinders 11. The battery holder 2 shown in FIG. 9 is provided with openings in the upper part of the holding cylinder 11 located at the uppermost stage, the lower part of the holding cylinder 11 located at the lowermost stage, and the side surfaces of the holding cylinder 11 located at the front and rear ends. ing. The battery holder 2 can detect the temperature of the battery 1 by disposing a temperature sensor (not shown) in the opening 11 </ b> A provided in the holding cylinder 11. This battery pack has a feature that it can control charging / discharging of the battery 1 while detecting the battery temperature with a temperature sensor. However, the holding cylinder is not necessarily provided with an opening.

  Although not shown, the holding cylinder 11 divided in the middle has an inner surface formed in a tapered shape with an inner diameter gradually decreasing from the dividing end side toward the supporting side wall 12 side. The holding cylinder 11 can hold the battery 1 in a fixed position by bringing the surface protruding from the inner surface of the end portion on the side of the support side wall 12 into surface contact with the surface of the battery 1. As described above, the structure in which the holding cylinder 11 is divided has a feature that simplifies the design of a mold for molding plastic and facilitates plastic molding.

  The pair of support side walls 12 are positioned at both ends of the holding cylinder 11 that is the battery storage unit 40 and are provided in parallel postures. The support side wall 12 is formed in a plate shape orthogonal to the holding cylinder 11. As shown in FIG. 7, the support side wall 12 has a shape along the inner shape of the outer case 4. That is, the pair of support side walls 12 have a shape along the inner surface in the cross section of the exterior case 4 as shown in FIG. Further, as shown in FIG. 6, each supporting side wall 12 has an outer peripheral shape that conforms to the inner shape in the longitudinal section of the exterior case 4. As shown in FIGS. 7 and 13, the pair of support side walls 12 are provided with a holding cylinder 11 at the center portion to form a battery storage portion 40, and a substrate storage space 41 at the outer peripheral portion. The battery holder 2 shown in FIGS. 7 and 13 has a pair of support side walls 12 protruding upward from both ends of the holding cylinder 11 in the figure, and the substrate holder 7 is accommodated between the pair of support side walls 12. A substrate storage space 41 is provided. The width of the storage space 41 of the substrate is specified by the length of the holding cylinder 11, that is, the length of the battery 1, and the depth is specified by the protruding height at which the support side wall 12 protrudes upward from the holding cylinder 11. The depth of the storage space 41, that is, the protruding height of the support side wall 12 is set such that the substrate holder 7 is stored in the storage space 41 and the substrate holder 7 does not contact the inner surface of the outer case 4.

  Further, the support side wall 12 is provided with a contact plate portion 12A that is in surface contact with the inner surface of the outer case 4 along the outer periphery. The battery holder 2 houses the battery core pack 10 in the exterior case 4 by bringing the contact plate portion 12 </ b> A into contact with the inner surface of the exterior case 4. In the illustrated battery holder 2, the contact plate portion 12 </ b> A is provided so as to protrude inside the support side wall 12, that is, on the side connecting the holding cylinder 11. The battery holder 2 arranges the outer periphery of the support side wall 12 on the inner surface of the outer case 4 in surface contact via the contact plate portion 12A. The contact plate portion 12 </ b> A can be widened to increase the contact area that makes surface contact with the inner surface of the outer case 4. Increasing the contact area can prevent a strong impact force from acting on the local portions of the battery holder 2 and the outer case 4 when receiving an impact such as dropping. This is because the impact force is dispersed over a wide area. The width of the contact plate portion 12A is, for example, 5 mm or more and 2 cm or less. The contact plate portion 12A can spread the impact over a wide area by increasing the width. Therefore, the width of the contact plate portion 12 </ b> A is specified to an optimum value in consideration of the number, size, and weight of the batteries 1 stored in the battery holder 2.

  Further, the battery holder 2 shown in FIG. 15 is provided with a slit 19 through which the substrate holder 7 can pass in the contact plate portion 12 </ b> A of the support side wall 12 in order to facilitate the insertion of the substrate holder 7 into the substrate storage space 41. The battery holder 2 shown in the figure is an upper portion of a pair of supporting side walls 12 and has a slit 19 by notching the opposing contact plate portion 12A at one corner portion. As shown in FIGS. 7 and 15, the slit 19 is opened at a position where the substrate holder 7 can be inserted into the substrate storage space 41 through the substrate holder 7. As shown by the arrows in FIG. 15, the battery holder 2 is stored by inserting the substrate holder 7 containing the circuit board 6 through the slit 19 of the contact plate portion 12A and inserting it horizontally in the figure. It is arranged at a fixed position in the space 41. As described above, the structure in which the slits 19 are provided in the corner portions of the pair of support side walls 12 and the substrate holder 7 is inserted into the storage space 41 from here, the width of the entire contact plate portion 12A is widened so that the impact is widened. The substrate holder 7 can be easily placed in the storage space 41 while having a structure that can be dispersed.

  Further, in the battery holder 2, the contact plate portion 12 </ b> A of the support side wall 12 is a curved surface along the inner surface of the outer case 4 in order to prevent the corner portion from being damaged by an impact. Further, the outer case 4 is formed into a shape that can be brought into surface contact with the contact plate portion 12A as a smooth surface without providing a rib or the like on the inner surface thereof.

  Further, in the battery pack, the cushion material 30 is disposed between the contact plate portion 12A and the outer case 4. In this battery pack, the contact plate portion 12 </ b> A is in surface contact with the inner surface of the exterior case 4 via the cushion material 30. In this structure, the cushion material 30 absorbs the impact and improves the impact strength. In the illustrated battery pack, the battery core pack 10 is placed in the waterproof bag 3 and stored in the outer case 4, and the waterproof bag 3 is used together with the cushion material 30.

  Furthermore, the battery holder 2 connects the lead plate 5 to the support side walls 12 located on both sides of the battery storage unit 40. The support side wall 12 is connected to the battery end surface exposed from the opening of the insertion hole 13 by welding the lead plate 5 outside the holding cylinder 11. The supporting side wall 12 of FIGS. 8 to 13 is provided with a positioning recess 24 into which the lead plate 5 is inserted on the outer surface, and the lead plate 5 is placed in the positioning recess 24 at a fixed position. The positioning recess 24 has an outer shape slightly larger than the outer shape of the lead plate 5, and the lead plate 5 is placed here and arranged at a fixed position.

  Further, the support side wall 12 opens a connection window 12 </ b> B for connecting the connection tab 5 </ b> A of the lead plate 5 to the circuit board 6. The connection window 12 </ b> B is opened at the position of the connection tab 5 </ b> A of the lead plate 5 disposed in the positioning recess 24, and the connection tab 5 </ b> A is exposed to the storage space 41. The connection tab 5A of the lead plate 5 is arranged in the connection window 12B and connected to the circuit board 6 of the board holder 7 arranged in the storage space 41. In the battery pack having this structure, the connection tab 5A of the lead plate 5 is arranged in the connection window 12B of the support side wall 12. Therefore, the connection tab 5A of the lead plate 5 is in a state where the battery core pack 10 is stored in the waterproof bag 3. There is a feature that can effectively prevent the waterproof bag 3 from being damaged. This is because the connection tab 5A of the lead plate 5 arranged in the connection window 12B is protected by the support side wall 12 and the contact plate portion 12A to prevent the connection tab 5A from coming into direct contact with the waterproof bag 3. Therefore, this structure can effectively prevent the connection tab 5A of the lead plate 5 from locally damaging the waterproof bag 3 from the inner surface.

  As shown in FIG. 9, the battery holder 2 described above is formed by integrally forming a holding cylinder 11 on a pair of support side walls 12 to form a holder unit 2A, and the holder unit 2A is connected. The pair of holder units 2A are connected to each other by screwing a set screw 23 into a boss 22 formed integrally. The holder unit 2A shown in FIGS. 9 to 11 and FIG. 13 is provided with bosses 22 integrally formed at both end portions and the lower center portion. The boss 22 is cylindrical and has a set screw 23 inserted therein. However, although not shown, the divided holder units can be connected by a locking structure, or can be connected by bonding, or can be connected in combination.

  In the battery holder 2 described above, half of the holding cylinder 11 and the supporting side wall 12 are integrally formed to form the holder unit 2A. However, the battery pack of the present invention does not specify the battery holder as described above. The battery holder can be any other structure that can hold a plurality of batteries in place. For example, the battery holder can have an integrated structure without dividing the holding cylinder and the supporting side wall, or can have a structure in which the holding cylinder and the supporting side walls at both ends are divided.

  As described above, the structure in which the plurality of batteries 1 are held in place by the battery holder 2 to form the core pack 10 has a feature that the assembly of the core pack 10 can be easily and easily performed. Further, there is a feature that the core pack 10 holding the plurality of batteries 1 in place can be smoothly stored in the waterproof bag 3.

  In the illustrated core pack 10, a substrate holder 7 is disposed in a substrate storage space 41 provided in the battery holder 2, and the circuit board 6 is coupled to the substrate holder 7. The circuit board 6 is mounted with a circuit that controls charging / discharging of the plurality of batteries 1. The substrate holder 7 places the circuit board 6 at a predetermined position.

  The substrate holder 7 accommodates the circuit board 6 and arranges it at a predetermined position. The substrate holder 7 shown in FIGS. 6, 7, 9, 16, and 17 has a peripheral wall 52 around the bottom plate 51 to form a box shape with an upper opening. The circuit board 6 is placed inside the peripheral wall 52. It is stored and placed at a predetermined position. As shown in FIG. 13, the substrate holder 7 is provided with a connecting portion 53 that protrudes downward from the bottom plate 51, and a set screw 39 that penetrates the battery holder 2 is screwed into the connecting portion 53. 2 is fixed. In order to screw the set screw 39 into the connecting portion 53, the battery holder 2 is integrally provided with a connecting boss 29 that protrudes inside the support side wall 12. As shown in FIG. 6, the connecting portion 53 can be disposed in a valley portion of the holding cylinder 11 that houses the cylindrical battery 1. The substrate holder 7 is fixed at a fixed position of the battery holder 2 by a set screw 39 passing through the connection boss 29 being screwed into the connection portion 53. However, although not shown, the substrate holder can be fixed to the battery holder with a locking structure.

  Further, the substrate holder 7 shown in FIGS. 6, 13, 16, and 17 is provided with a support rib 54 that protrudes inward from the bottom plate 51, and the circuit board 6 is fixed to the upper surface of the support rib 54. The circuit board 6 is disposed at a position away from the bottom plate 51 of the board holder 7. The support rib 54 shown in the drawing has a planar shape that is a loop shape that follows the outer shape of the circuit board 6 and is smaller than the outer shape of the circuit board 6. The loop-shaped support rib 54 has a lower end connected to the bottom plate 51 and has a container shape with an upper opening as a whole. Further, the support rib 54 is integrally provided with a connection boss 55 for fixing the circuit board 6, and the circuit board 6 is fixed to the connection boss 55 via the set screw 31. Further, the support rib 54 shown in the drawing is integrally provided with a positioning convex portion 56 for fixing the circuit board 6 at a fixed position, and the circuit board 6 is positioned so as to be inserted through the positioning convex portion 56. The hole 6A is opened. The circuit board 6 is fixed to a fixed position of the substrate holder 7 by screwing the set screw 31 into the connecting boss 55 in a state in which the positioning protrusion 56 is guided to the positioning hole 6A. In the circuit board 6, electronic parts (not shown) for realizing a protection circuit or the like are arranged on the surface (the lower surface in FIGS. 6 and 13) facing the bottom plate 51 of the substrate holder 7. The substrate holder 7 closes the upper opening of the support rib 54 with the circuit board 6 fixed to the upper surface of the support rib 54, and provides a closed space 50 inside. In this way, the structure in which the closed space 50 is provided between the bottom plate 51 of the substrate holder 7 and the circuit board 6 is filled with the insulating resin 14 inside the peripheral wall 52 of the substrate holder 7 as shown in FIGS. When the circuit board 6 is potted and embedded, the amount of the insulating resin 14 filled in the board holder 7 can be reduced and the cost can be reduced. This is because the closed space 50 closed by the support rib 54 and the circuit board 6 can be used as a region where the insulating resin 14 is not filled, and the circuit board 6 can be potted without filling the closed space 50 with the insulating resin 14. is there.

  Further, in the structure in which the closed space 50 is provided between the bottom plate 51 of the substrate holder 7 and the circuit board 6, the closed space 50 can be used in combination with a storage space for electronic components mounted on the lower surface of the circuit board 6. As described above, the structure in which the electronic components are arranged on the surface of the substrate holder 7 facing the bottom plate 51 effectively prevents the unevenness of these electronic components from being damaged by being in contact with the flexible sheet of the waterproof bag 3 to be described later. There is a feature that can prevent.

  Further, the substrate holder 7 shown in FIG. 13 is provided with a central convex portion 57 located on the opening 11 </ b> A provided on the upper portion of the holding cylinder 11 located on the uppermost stage of the battery holder 2 on the bottom surface of the bottom plate 51. The substrate holder 7 of FIG. 13 is formed such that the bottom plate 51 is formed to have a central recess, that is, the bottom surface 51 is formed to have a central convex in the drawing, and a central convex portion 57 is provided. 7, the volume of the closed space 50 formed in the interior of 7 is increased. In this structure, since the closed space 50 of the substrate holder 7 can be deepened without increasing the support ribs 54, the substrate holder 7 is disposed on the lower surface of the circuit substrate 6 while being disposed in a space in the substrate storage space 41. Space for storing electronic components can be increased. Further, in the substrate holder 7 shown in the figure, a temperature sensor 18 is disposed on the lower surface of the central convex portion 57 of the bottom plate 51, and this temperature sensor 18 is disposed in an opening 11 </ b> A provided in the upper portion of the holding cylinder 11. .

  Further, the substrate holder 7 shown in the drawing is provided with a notch 58 for drawing out the connection leads 21 fixed to the circuit board 6 to the outside of the substrate holder 7 on the peripheral wall 52 facing both side edges of the circuit board 6. The notch 58 is provided at a position facing the connection lead 21 fixed to the circuit board 6. The board holder 7 guides the connection leads 21 drawn from both sides of the circuit board 6 to the outside of the board holder 7 to the notch 58, so that the upper ends of the connection leads 21 and the lead plate 5 are higher than the upper ends of the peripheral walls 52. Arranged without protruding.

  Further, in the battery pack shown in FIGS. 6 and 13, the circuit board 6 is potted and embedded in the insulating resin 14. This structure has a feature that the circuit board 6 can be protected by the potting resin, and the electronic component mounted on the circuit board 6 can be embedded in the potting resin, and the circuit board 6 from which the electronic component does not protrude can be stored in the waterproof bag 3. is there. For this reason, the characteristic which can prevent effectively that the waterproof bag 3 which consists of a flexible sheet contacts the unevenness | corrugation of the circuit board 6, and is damaged is also implement | achieved. Further, the structure in which the circuit board 6 is potted on the insulating resin 14 and the core pack 10 is accommodated in the waterproof bag 3 can protect the circuit board 6 with the waterproof structure by both the waterproof bag 3 and the potting resin. Thus, it is possible to charge and discharge while protecting the battery 1 with the circuit board 6 over a long period of time.

  The above substrate holder 7 is potted by filling the inner side of the peripheral wall 52 with the insulating resin 14 while the circuit board 6 is fixed at a fixed position. Therefore, as a pre-process for fixing the circuit board 6 to the board holder 7, the output lead plate 20 to which the connection lead 21 connected to the connection tab 5A of the intermediate lead plate 5Y and the connection tab 5A of the output lead plate 5X are connected. Furthermore, an electronic component (not shown) for realizing the protection circuit is fixed in advance. In the substrate holder 7 to which the circuit board 6 is fixed and the insulating resin 14 is potted, the connection leads 21 fixed to both side edges of the circuit board 6 project outward from the notches 58 on both sides of the substrate holder 7. The substrate holder 7 shown in the figure is provided with a protective rib 59 protruding in the outer peripheral direction of the peripheral wall 52 adjacent to the connection lead 21 protruding outward from both sides. In the illustrated substrate holder 7, a protective rib 59 is integrally formed at the opening edge portion of the cutout portion 58 for pulling out the connection lead 21, and the protective rib 59 protrudes larger than the connection lead 21. This protective rib 59 effectively prevents the tip of the connection lead 21 protruding from the notch 58 from coming into direct contact with the outside and being deformed or damaged. This structure can effectively prevent the connection lead 21 protruding from the substrate holder 7 from being deformed by collision or contact with the outside in the manufacturing process of the battery pack or the like. In particular, even when the connecting lead is an elongated wire, it can be reliably protected.

  Further, a lead wire 8 is drawn out from the circuit board 6. The lead wire 8 has a connector 15 connected to an external device connected to the tip. Although not shown, the circuit board can be connected to a connector by pulling out a communication lead wire. The connector 15 is equipped with an output terminal for output of the built-in battery 1 and a connection terminal with an external device. The connector 15 is disposed in the opening window 4a provided in the exterior case 4 in a state where the output terminal and the connection terminal are exposed to the outside.

  As described above, the plurality of batteries 1 are held at predetermined positions by the battery holder 2, the substrate holder 7 to which the circuit board 6 is fixed is fixed to the battery holder 2, and further connected to the end face of each battery 1. The lead plate 5 is connected to the circuit board 6 to form a battery core pack 10.

  The battery core pack 10 is housed in the waterproof bag 3, and its opening is closed in a watertight manner and housed in the outer case 4. In this battery pack, the core pack 10 in which the circuit board 6 is connected to the battery 1 is housed in the waterproof bag 3, so that the circuit board 6 in addition to the battery 1 can be housed together in the outer case 4 as a waterproof structure. In particular, in this structure, in addition to the battery 1 and the circuit board 6, the entire core pack including the connection portion between the battery 1 and the circuit board 6 can be stored in the waterproof bag 3. For this reason, in an ideal state, both the battery 1 and the circuit board 6 can be stored in the outer case 4 as a waterproof structure. According to this structure, the connection portion between the battery 1 and the circuit board 6 can also be stored in the waterproof bag 3, so that it is not necessary to apply a sealing material or the like to make this portion waterproof. Further, there is no problem that the sealing material is deteriorated and cannot be held in the waterproof structure. The battery pack having this structure has a very simple structure in which only the lead wire 8 is drawn from the waterproof bag 3. Therefore, only the lead wire 8 can be pulled out from the opening of the waterproof bag 3 with a waterproof structure, and the entire battery 1 and the circuit board 6 can be accommodated in the exterior case 4 as a waterproof structure.

  As shown in FIG. 18, the waterproof bag 3 is formed by forming a flexible sheet into a bag shape. A plastic sheet can be used as the flexible sheet of the waterproof bag 3. For the plastic sheet, polyimide (PI), polyethylene imide (PEI), pet (PET) or the like can be used. These plastic sheets are characterized by excellent flexibility and heat resistance. In addition, the electrolytic solution discharged when the safety valve of the battery is opened does not melt or cause a chemical reaction. However, other plastic sheets can be used as the flexible sheet.

  The waterproof bag 3 shown in FIG. 18 includes a storage portion 3B for storing the core pack 10 of the battery, and a part of the waterproof bag 3 is opened to draw out the lead wire 8. The waterproof bag 3 stores the core pack 10 of the battery in the storage portion 3B, and pulls the lead wire 8 drawn out from the core pack 10 to the outside from the opening. The storage part 3B of the waterproof bag 3 is formed in a shape and size that can store the core pack 10 of the battery. The waterproof bag 3 has a bag shape that follows the outer shape of the core pack 10 of the battery to be stored, for example, a rectangular parallelepiped shape or a rectangular tube shape that is slightly larger than the outer shape of the core pack 10 so that the core pack 10 can be stored without difficulty. be able to. However, the waterproof bag may be cylindrical or elliptical.

  As shown in FIGS. 18 to 20, the waterproof bag 3 is configured such that the storage portion 3 </ b> B has a bag shape that can store the battery core pack 10, and the battery core pack 10 is stored in this portion and the lead wire 8 is pulled out. The opening which is a portion is narrowed down to form a lead wire lead-out portion 3Y. In the waterproof bag 3 shown in the figure, the opening and the storage portion 3B have a cylindrical shape with the same thickness. This waterproof bag 3 can be mass-produced efficiently and inexpensively by cutting a plastic material into a cylindrical shape into a predetermined length. The waterproof bag 3 shown in the drawing is formed into a bag shape in which one end of a flexible sheet formed into a cylindrical shape is welded or bonded, and the other end is an opening. Further, the battery core pack 10 is inserted into the storage portion 3B of the waterproof bag 3 formed into a bag shape, the lead wire 8 is pulled out from the opening, and this portion is narrowed down to form the lead wire lead-out portion 3Y.

  As shown in FIG. 20, the waterproof bag 3 can close the lead wire lead-out portion 3Y with a closure 9 and store the battery core pack 10 in a waterproof structure. The obturator 9 shown in the figure is a binding tool 9A that binds the lead wire lead-out portion 3Y from the outside. The binding tool 9A of FIG. 20 is a binding band. The binding tool 9A, which is a binding band, wraps the band portion 9a around the lead wire lead-out portion 3Y through which the lead wire 8 is inserted, inserts the band portion 9a into the locking portion 9b, and then connects the locking portion 9b to the band portion. Tighten toward the base of 9a and bind so that it does not come off. However, a wire rod can be used for the binding tool. Although not shown in the figure, a wire or a binding string can be used for the binding tool that is a wire. A binding tool, which is a wire rod, is wound around the lead wire lead-out portion through which the lead wire is inserted and bound. Furthermore, an adhesive tape can be used for the obturator. The obturator, which is an adhesive tape, is wound around the lead wire drawing portion. The above obturator has a simple structure and can block the lead wire lead-out portion 3Y from the outside at a low cost. Further, the binding tool 9A and the closing tool 9 that is an adhesive tape are bound from the outside in a state where, for example, the gap between the lead wire 8 drawn from the waterproof bag 3 and the opening is filled with an adhesive or a sealant. With this structure, the opening of the waterproof bag 3 can be reliably closed.

  Further, although not shown, the waterproof bag can close the lead wire lead-out portion with a cord bush. For example, the cord bush is formed of a rubber-like elastic body such as rubber or soft plastic so that the lead wire is inserted in a watertight manner, and the flexible sheet of the waterproof bag is watertightly bundled along the outer peripheral surface. Can be blocked. As described above, the cord bush of the rubber-like elastic body can pull out the lead wire while elastically sandwiching the lead wire or the flexible sheet of the waterproof bag and sealing the waterproof structure. The cord bush, which is a rubber-like elastic body, can be formed by insert-molding a lead wire and inserting the lead wire in a water-tight manner, or by inserting the lead wire in a state of being press-fitted into the through hole. Since the above cord bush seals the lead wire and the waterproof bag separately, there is a feature that both the lead wire and the waterproof bag can be reliably closed with a waterproof structure. However, the obturator can also draw out the lead wire from the waterproof bag with a waterproof structure by sandwiching both the lead wire and the flexible sheet in a watertight manner.

  As described above, the waterproof bag 3 in which the lead wire lead-out portion 3Y is closed with a waterproof structure effectively prevents moisture from entering from the outside and reliably waterproofs the core pack 10 housed inside. Further, the waterproof bag 3 closed by the waterproof structure has an advantage that the electrolyte discharged when the safety valve of the battery 1 to be stored is opened can be effectively prevented from leaking to the outside of the waterproof bag 3.

  As shown in FIG. 21, the lead wire lead portion 3 </ b> Y that pulls the lead wire 8 out of the waterproof bag 3 is folded at the end portion of the core pack 10 and disposed in the lead space 42 provided below the battery holder 2. . As shown in FIG. 7, the battery holder 2 is provided with a lead-out space 42 in which the lead wire lead-out portion 3 </ b> Y of the waterproof bag 3 is disposed between the pair of support side walls 12. The drawing space 42 is provided on the opposite side of the substrate storage space 41. Since the battery holder 2 of FIG. 7 has a substrate storage space 41 above the battery storage portion 40, a drawer space 42 is provided below the battery storage portion 40. The battery holder 2 shown in the figure has a pair of support side walls 12 projecting downward from both ends of the holding cylinder 11 in the figure, and a lead space for storing the lead wire lead portion 3Y between the pair of support side walls 12. 42 is provided. The lead-out space 42 is designed to a depth at which the lead wire lead-out portion 3Y, which is an opening of the waterproof bag 3 housing the lead wire 8, can be disposed.

  However, the waterproof bag is not specified in the above structure. The waterproof bag can employ any other structure that allows the lead wire connected to the battery core pack to be pulled out while the battery core pack is housed in a waterproof structure.

  As described above, the core pack 10 is accommodated in the waterproof bag 3 and the lead wire 8 drawn out from the circuit board 6 is drawn out from the waterproof bag 3 with a waterproof structure in the lead wire lead-out portion 3Y. The waterproof bag 3 that closes the lead wire lead-out portion 3Y with the closing tool 9 or a sealing agent is preferably hermetically closed at the closed portion and can be stored in the outer case 4. In the battery pack in which the waterproof bag 3 is airtightly closed and stored in the outer case 4, when the air temperature in the waterproof bag changes and expands or contracts, the waterproof bag of the flexible sheet is deformed, and the waterproof bag Air is not exhausted from the air, and air is not inhaled into the waterproof bag. Therefore, intrusion of outside air into the waterproof bag due to temperature change can be prevented in an ideal state, and corrosion of the battery and lead plate due to condensed water can be reliably prevented. Furthermore, the waterproof bag that is airtightly closed can effectively prevent condensation and the like by using the gas remaining inside as dry air or inert gas.

  However, in this specification, airtightly closing the waterproof bag does not mean only a state in which the opening and closing of the waterproof bag is blocked by completely shutting in and out of the air, but the air in the waterproof bag is externally closed. It is used in a broad sense including a state in which it can be evacuated, for example, a state in which the waterproof bag is pressed from the outside and is closed so that the air inside the waterproof bag can be exhausted under pressure. In this state, in the normal state where no pressure is applied from the outside, air does not enter or leave the waterproof bag. Therefore, outside air does not enter the inside of the waterproof bag due to temperature change. However, the battery pack of the present invention does not necessarily need to hermetically close the waterproof bag.

  Further, the waterproof bag 3 that closes the lead wire lead-out portion 3Y with the closing tool 9 or a sealing agent is preferably closed in a state where the internal air is exhausted, or after the opening portion is closed, the internal air is exhausted. To do. When the inside of the waterproof bag is filled with air, it becomes inflated like a balloon and its volume increases, making it difficult to store in the outer case, and receiving impact or impact during storage in the outer case. This is because the flexible sheet is likely to be damaged. In other words, the waterproof bag with the inside air exhausted, in a state where the entire bag is squeezed, can be easily stored in the outer case by reducing the volume, and also minimizes damage during storage or when shocked it can.

  The waterproof bag 3 can exhaust the air from the closed portion by closing the lead wire lead-out portion 3Y with the closing tool 9 and then pressing the waterproof bag 3 from the outside to increase the pressure in the bag. Further, the waterproof bag 3 can also exhaust the internal air while sucking the internal air, that is, closing the lead wire lead-out portion 3Y in a state where the internal pressure is reduced. As described above, the waterproof bag 3 for decompressing the interior has a feature that the entire inner surface of the flexible sheet is brought into close contact with the outer peripheral surface of the support side wall 12 and can be stored in the storage case 4 without difficulty as a compact shape as a whole. The waterproof bag 3 can, for example, exhaust the air in the waterproof bag from the lead wire lead-out part 3Y, and reduce the inside of the waterproof bag 3 to be in close contact with the surface of the core pack 10. The waterproof bag can be decompressed by inserting a suction nozzle into the lead wire lead-out portion to suck the air inside. This waterproof bag can be airtightly closed by exhausting the air inside and then closing the lead wire lead-out portion with a sealing agent such as silicone resin.

  As described above, the waterproof bag 3 for exhausting the internal air is housed in the external case 4 in a state where the internal air is exhausted, or the external case 4 composed of the first case 4A and the second case 4B described later. Of these, the internal air can be exhausted in a state of being housed in one case and then closed in the other case. Since this pack battery exhausts the air inside and can easily store the outer shape of the waterproof bag in the storage case 4 as a compact shape along the outer shape of the core pack, It can be effectively prevented from being damaged.

  In the above battery pack, the opening of the waterproof bag 3 is closed with a closing tool 9 such as a binding tool or a cord bush, or closed with a sealing agent, and the lead wire 8 is drawn out from the waterproof bag 3. However, the battery pack does not necessarily need to close the opening of the waterproof bag with a closure or sealant and pull out the lead wire, and the lead wire drawn out of the waterproof bag can be pulled directly out of the opening. it can.

  Furthermore, the battery pack is not shown, but the outer side of the waterproof bag that houses the core pack of the battery is covered with a shrink tube, or the adhesive bag is attached to the outer side of the waterproof bag, and the waterproof bag is attached to the surface of the core pack. It can also be along. The shrinkable tube is a heat shrinkable tube or a rubber-like elastic body. As the heat-shrinkable tube, a tube-shaped sheet of vinyl chloride or polyolefin can be used. Flame retardant silicon can be used for the rubber-like elastic body. These shrinkable tubes can be in a size and shape so as to be in close contact with the surface of the waterproof bag containing the core pack in a contracted state. For example, a polypropylene tape can be used as the adhesive tape. The adhesive tape can adhere to the surface of the outer peripheral portion of the support side wall and the curved plate portion, which are contact surfaces with the inner surface of the exterior case. The structure in which the adhesive tape is attached to this portion can effectively cover the contact surface with the inner surface of the outer case.

  As described above, the structure in which the outer periphery of the waterproof bag is covered with a shrink tube or adhesive tape allows the waterproof bag, which is a flexible sheet, to be in close contact with the outer peripheral surface of the core pack, effectively preventing the waterproof bag from being bulky And it has the feature that it can be easily stored in the outer case and assembled efficiently. In addition, the shrinkable tube or adhesive tape that covers the outer periphery of the waterproof bag can cover the contact surface with the inner surface of the outer case, so it is effective that the flexible sheet of the waterproof bag is pinched between the core pack and the outer case and breaks. There is a feature that can be prevented.

  The outer case 4 is manufactured by molding plastic. The outer case 4 in FIGS. 3 to 7 connects the first case 4A made of plastic and the second case 4B, and houses the waterproof bag 3 containing the core pack 10 therein. The first case 4A and the second case 4B are provided by integrally molding the peripheral wall 34. Further, the exterior case 4 shown in the figure has a boss 35 protruding from the inside. The bosses 35 are provided at the corners of the first case 4A and the second case 4B. A set screw (not shown) is inserted through the boss 35, and the first case 4A and the second case 4B are connected by the set screw. The connected first case 4A and second case 4B are closed by bringing the opening edges of the peripheral wall 34 into contact with each other without any gap.

  Further, the exterior case 4 is provided with an opening window 4a for exposing the connector 15 connected to the electric device to the outside. In this battery pack, an opening window 4a is provided at the connecting portion between the first case 4A and the second case 4B, and the connector 15 is sandwiched between the opening windows 4a of the first case 4A and the second case 4B. Are connected in a state of being exposed from the opening window 4 a of the outer case 4. In this battery pack, the connector 15 is connected to a power supply unit of an electric device (not shown), and the battery pack is connected to a fixed position. The connector 15 exposes and provides an output terminal (not shown) of the battery pack. The output terminal is connected to the battery 1 via the lead wire 8. Further, in this battery pack, the connector 15 is also connected to a charging connection portion of a charger (not shown). A charger connects the connector 15 to a charge connection part, connects a battery pack to a fixed position, and charges.

  The exterior case can be provided with an operation window and a display window for exposing the capacity display switch of the battery pack and the light emitting diode to the outside. The operation window can be provided at a position where the capacitance display switch provided on the circuit board is exposed to the outside. The display window can be provided at a position where the light emitted from the light emitting diode provided on the circuit board can be displayed to the outside.

The above battery pack is assembled as follows.
(1) After all the batteries 1 are inserted into the holding cylinder 11 of the battery holder 2, the pair of holder units 2A are connected.
(2) The circuit board 6 is fixed to the board holder 7. The circuit board 6 has electronic components (not shown) for realizing a protection circuit, and connection leads 21 and output side lead plates 20 connected to the lead plate 5 fixed in advance by soldering or the like. After fixing the circuit board 6 to the board holder 7, the board holder 7 is filled with the insulating resin 14, and the circuit board 6 is potted and embedded.
(3) The substrate holder 7 is fixed in the storage space 41 of the battery holder 2. As shown in FIG. 13, the substrate holder 7 fixes the connecting portion 53 to the battery holder 2 via a set screw 39.
(4) The lead plate 5 is welded and fixed to the end face electrode of each battery 1. The connection tab 5 </ b> A of the lead plate 5 is connected to the circuit board 6. The connection tab 5 </ b> A of the lead plate 5 is disposed in the connection window 12 </ b> B of the support side wall 12 and is connected to the circuit board 6. The connection tab 5 </ b> A of the lead plate 5 is connected to the circuit board 6 via a connection lead 21 fixed to the circuit board 6.

The battery core pack 10 is assembled through the above steps.
(5) The battery core pack 10 is put in the waterproof bag 3, and the lead wire 8 is pulled out from the opening of the waterproof bag 3. The opening through which the lead wire 8 is drawn can be closed with a closing tool 9 such as a binding tool or a cord bush. A portion where the lead wire 8 is drawn out is a lead wire lead-out portion 3Y, and the lead wire lead-out portion 3Y is folded back and disposed in the lead-out space 42 of the battery holder 2. Furthermore, the waterproof bag in which the core pack is stored can be covered with a shrinkable tube or an adhesive tape on the outside.
(6) The prevention bag 3 in which the core pack 10 is stored is stored in the outer case 4.
(7) The first case 4A and the second case 4B of the outer case 4 are connected.

  The battery pack of the present invention is used as a power source for electric devices used outdoors, such as electric bicycles, electric vehicles, and working robots.

DESCRIPTION OF SYMBOLS 1 ... Battery 2 ... Battery holder 2A ... Holder unit 3 ... Waterproof bag 3B ... Storage part
3Y ... Lead wire lead-out part 4 ... Exterior case 4A ... First case
4B ... Second case
4a ... Opening window 5 ... Lead plate 5A ... Connection tab
5a ... Slit
5X ... Output lead plate
5Y ... Intermediate lead plate 6 ... Circuit board 6A ... Positioning hole 7 ... Substrate holder 8 ... Lead wire 9 ... Obturator 9A ... Binder
9a ... Band part
9b ... Locking part 10 ... Core pack 11 ... Holding cylinder 11A ... Opening part 12 ... Supporting side wall 12A ... Contact plate part
12B ... Connection window 13 ... Insertion hole 14 ... Insulating resin 15 ... Connector 18 ... Temperature sensor 19 ... Slit 20 ... Output side lead plate 21 ... Connection lead 22 ... Boss 23 ... Set screw 24 ... Positioning recess 29 ... Connection boss 30 ... Cushion material 31 ... Set screw 34 ... Peripheral wall 35 ... Boss 39 ... Set screw 40 ... Battery storage part 41 ... Storage space 42 ... Drawer space 50 ... Closure space 51 ... Bottom plate 52 ... Peripheral wall 53 ... Connection part 54 ... Supporting rib 55 ... Connection Boss 56 ... Positioning convex part 57 ... Center convex part 58 ... Notch part 59 ... Protective rib 60 ... Arrangement area 102 ... Battery holder 105 ... Lead board 106 ... Circuit board 110 ... Core pack 121 ... Connection lead 160 ... Arrangement area

Claims (7)

A battery holder (2) having a plurality of batteries (1) having positive and negative end electrodes at both ends in parallel postures, and arranging end electrodes at both ends on the same surface and arranged in multiple rows and columns, A lead plate (5) connected to the end electrode of the battery (1) housed in the battery holder (2) and connecting adjacent batteries (1) in series and in parallel, and the lead plate (5 And a circuit board (6) connected to
The battery holder (2) holds a plurality of batteries (1) in place, and a circuit board (6) is connected to the battery holder (2) to form a battery core pack (10). ) is a battery pack comprising housed in an exterior case (4), possess all the following configurations,
(A) The circuit board (6) is fixed on the surface with an electronic component that realizes a protection circuit that detects the voltage of each battery (1) and controls the charge and discharge of the battery (1).
(B) The battery holder (2) accommodates the battery (1) so that the end electrodes are exposed on both side surfaces thereof, and the lead plate (5) is attached to the end electrodes exposed from the battery holder (2). The lead plates (5) are connected to both opposing side surfaces.
(C) The circuit board (6) is connected to the battery holder (2) in such a posture that both side edges are arranged on both sides of the battery holder (2), and is arranged on both sides of the battery holder (2). Each lead plate (5) is extended inward from both side edges of the circuit board (6) and connected to a predetermined position.
(D) The lead plate (5) includes an output lead plate (5X) connected to the output terminal, and an intermediate lead plate connecting the batteries (1) arranged in multiple stages and multiple rows in series and in parallel. (5Y).
(E) The output lead plate (5X) and the intermediate lead plate (5Y) are provided with connection tabs (5A) connected to the circuit board (6) at the ends approaching the circuit board (6).
(F) The intermediate lead plate (5Y) has a plurality of connection tabs (5A) at predetermined intervals at the end thereof, and any of the connection tabs (5A) is connected to the circuit board (6).
The intermediate lead plate (5Y) is provided with two rows of connection tabs (5A) protruding from the end, and is one of the connection tabs (5A) close to the opposing positions on both sides of the circuit board (6) connection tab Rupa click batteries are connected to (5A) circuit board (6) which is arranged. The battery pack according to claim 1, wherein the intermediate lead plates (5Y) arranged on both side surfaces of the battery holder (2) have the same shape. The battery holder (2) has a pair of supporting side walls (12) with a predetermined width at the opening edge and protrudes from both sides to the outer periphery, and a circuit board (6) between the pair of supporting side walls (12). Is placed,
Further, the pair of support side walls (12) is provided with a contact plate portion (12A) in surface contact with the inner surface of the exterior case (4) on the outer periphery, and this contact plate portion (12A) is provided on the outer case (4). The battery core pack (10) is stored in the outer case (4) in contact with the inner surface,
The battery pack according to claim 1, wherein the support side wall (12) is provided with a slit (19) through which the circuit board (6) can pass.   The battery pack according to claim 1, wherein the battery holder (2) has a row of batteries (1) arranged in a zigzag pattern.   The battery pack according to claim 1, wherein the protection circuit mounted on the circuit board (6) is mounted with a semiconductor switching element that is controlled to be turned on and off to control the current of the battery (1).   The circuit board (6) is connected to the battery holder (2) via a board holder (7), and the board holder (7) is provided with a peripheral wall (52) around a bottom plate (51). As a box shape with an upper opening, the circuit board (6) is accommodated inside the peripheral wall (52), and an insulating resin (14) is filled inside the peripheral wall (52), so that the circuit board (6) is provided. The substrate holder (7) is embedded in an insulating resin (14), and the substrate holder (7) is provided with a support rib (54) protruding inward from the bottom plate (51), and the circuit is formed on the upper surface of the support rib (54). The substrate (6) is fixed, and the support rib (54) has a loop shape that follows the outer shape of the circuit board (6), and is smaller than the outer shape of the circuit board (6). The battery pack according to claim 1, wherein an upper opening of the support rib (54) is closed by the circuit board (6) to provide a closed space (50) therein.   The circuit board (6) is connected to the battery holder (2) via a board holder (7), and the board holder (7) is provided with a peripheral wall (52) around a bottom plate (51). As a box shape with an upper opening, the circuit board (6) is housed inside the peripheral wall (52), and the circuit board (6) is connected to the connection tab (5A) of the lead plate (5). Connecting leads (21) to be protruded outward from both sides of the substrate holder (7), and the substrate holder (7) is adjacent to the connecting leads (21) protruding outward from both sides The battery pack according to claim 1, further comprising a protective rib (59) protruding in an outer peripheral direction of the peripheral wall (52).

Images