JP2011243426A - Battery pack and battery pack connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow wiring works for detecting midpoint potentials to be performed safely without overloading an electrical circuit.SOLUTION: A battery pack comprises a battery connector 51 with multiple connector pins for a battery 52 arrayed in parallel that are electrically connected to multiple lead plates 20 respectively; and a board connector 56 with multiple connector pins for a board 57 arrayed in parallel that are individually connected to multiple input terminals of a voltage detection circuit 42. By connecting the battery connector 51 and the board connector 56, the corresponding connector pins of the battery connector 51 and the board connector 56 are electrically connected, and multiple midpoint potentials of a battery assembly 1 can be input individually into the voltage detection circuit 42. The battery connector 51 changes length of each of the connector pins for a battery 52 so that the connector pins for a battery 52 are shorter when the midpoint potentials of the battery assembly 1 are lower voltages, and the connector pins for a battery 52 are longer when the midpoint potentials of the battery assembly 1 are higher voltages.

Description

  The present invention relates to a battery pack containing a plurality of rechargeable cells and a connector used in the battery pack.

  With the widespread use of electric devices such as electric scooters and assist bicycles that are driven by obtaining electric power from battery packs, higher output of battery packs is required. In such a battery pack, in order to obtain a large current, a plurality of unit cells are connected in series to increase the output voltage, and connected in parallel to increase the output current. Moreover, a lithium ion secondary battery having a large capacity per volume is used as the unit cell.

  In a battery pack using a high-capacity unit cell, since the unit cell is used stably over a long period of time, management of each unit cell is important. For example, a protection circuit having functions such as measuring and monitoring the cell voltage and cell temperature of the unit cell and limiting the charge / discharge current value or stopping the charge / discharge when these values exceed a certain level is provided. In a battery pack provided with such a protection circuit, it is necessary to electrically connect the unit cell and the protection circuit. For example, in order to measure the intermediate potential of a battery assembly configured by connecting unit cells in series, as shown in FIG. 34, the potential of a lead plate in which a plurality of unit cells 11 are connected in parallel is protected. The voltage detection IC 42B fixed on the circuit board is connected via a lead wire or the like. Such wiring work becomes more complicated as the number of unit cells increases. In particular, with the recent demand for higher output, the number of unit cells to be used tends to increase, while cost reduction is also required.

  As a method for simplifying such wiring work, a method of connecting together using a connector is conceivable. In this method, as shown in FIG. 35, each pin of a battery-side connector having a large number of pins is connected to a lead plate, and this battery-side connector is connected to a board-side connector connected to the voltage detection IC 42B. This simplifies the connection work. Since the battery side connector and the board side connector are electrically connected by inserting one pin into the other pin hole, a large number of electrical connections can be achieved simultaneously by connecting the connectors. The voltage detection IC 42B detects an intermediate potential by detecting a potential difference between adjacent pins.

  However, in the connection using such a connector, the connection order of pins may not be constant. As a result, a high voltage is applied to the voltage detection IC 42B, and the voltage detection IC 42B may fail. That is, as shown in FIG. 36, in the configuration in which the respective intermediate potentials of the battery assembly in which a large number of unit cells 11 are connected in series are drawn together and the connection between the pins of the connectors and the pin holes is provided, the connection between the pins and the pin holes The voltage is 0 V at a location where no is performed. Since the voltage detection IC 42B is configured to detect a potential difference between adjacent pins, if the voltage of a certain pin is 0V, the potential difference from the adjacent pin is detected as high as that. For example, in the example shown in FIG. 36, when the connectors are connected, the pin and the pin hole are connected first at the positions A and D, while the connection at the positions C and B is slightly delayed. Then, even if there is a momentary delay, the series voltage of the unit cell 11 during this period is instantaneously applied to the voltage detection IC 42B by connection at the positions A and D. Since the voltage detection IC 42B is originally selected on the assumption of a voltage corresponding to one unit cell 11, resistance to high voltage due to the series connection of a large number of unit cells 11 is not considered at the time of design. There is a possibility that the device is destroyed by applying the above high voltage. If the connectors are connected so that the pins are in contact with each other at the same time, such a problem does not occur. However, in reality, there is a manufacturing tolerance in the length of each pin, and the connectors are not always connected in a vertical posture, and if the connectors are connected obliquely, the connection order of the pins may be different. Arise. As a result, as described above, the unintended pin connection order results in an unintended high voltage being applied to the voltage detection IC 42B depending on the order, and a voltage higher than the rated voltage is applied to the voltage detection IC 42B. It is possible that it will break down. Further, the failure of the voltage detection IC 42B may adversely affect other elements mounted on the protection circuit board. In the worst case, the entire protection board needs to be replaced. For the same reason, even when the connector is removed, it is necessary to release each unit cell 11 from the high voltage side to the low voltage side. In particular, the protection circuit is generally configured to monitor the voltage by always connecting to the unit cell 11 without switching such as connection switching using a multiplexer or the like, so there is a problem of unintended application of a high voltage during wiring or disassembly. There was a problem that could not be avoided.

  Under such circumstances, it has been conventionally considered that connection by a connector is impossible, and individual wiring using lead wires has been performed. Specifically, the lead plate which is the intermediate potential portion of the unit cell 11 and the lead wire extended from the protection circuit board are sequentially wired from the low voltage side by soldering, or disassembled from the high voltage side. . However, this method requires individual wiring work as described above, which is very complicated and increases the manufacturing cost.

Japanese Patent Laid-Open No. 11-185858 Japanese Patent Laid-Open No. 11-185860 JP 2006-286553 A

  The present invention has been made in view of such conventional problems, and its main purpose is to perform wiring work for detecting an intermediate potential safely without overloading the circuit. An object of the present invention is to provide a battery pack and a battery pack connector that can be used.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, according to the battery pack of the first aspect of the present invention, a battery assembly 1 in which a plurality of unit cells 11 are connected in series and a serial connection interface between the unit cells 11 are provided. A plurality of lead plates 20, a plurality of lead plates 20, and a plurality of battery side connector pins 52 electrically connected to each other, a plurality of battery side connectors 51 arranged in parallel, and the battery assembly 1 The voltage detection circuit 42 having a plurality of input terminals for detecting an intermediate potential between the unit cells 11 and a plurality of board-side connector pins 57 individually connected to the plurality of input terminals of the voltage detection circuit 42 are parallel to each other. Board-side connectors 56 arranged in parallel, and by connecting the battery-side connector 51 and the board-side connector 56, the battery-side connector pins 5 corresponding to the battery-side connector 51 and the board-side connector 56 are connected. The battery pack is configured such that a plurality of intermediate potentials of the battery assembly 1 can be input to the voltage detection circuit 42 by electrically connecting the battery assembly 1 and the battery-side connector 51 and the board-side connector 56. At the time of connection, it is possible to provide connection delay means for connecting a connector pin having a low intermediate potential before a connector pin having a high voltage. As a result, when connecting the battery side connector and the board side connector, the connection delay means can provide a time difference in the timing at which each battery side connector pin is connected to the board side connector pin on the board side connector side. By connecting the connector pins in order from the connector pin on the side, it is possible to avoid applying an excessive voltage to the voltage detection circuit, to eliminate overload and failure of the circuit, and to improve the reliability of the battery pack. it can.

  Also, according to the battery pack of the second aspect of the present invention, the connection delaying unit is configured such that the battery-side connector 51 is connected to the battery-side connector 51 at the lower voltage side of the intermediate potential of the battery assembly 1. The length of each battery side connector pin 52 can be changed such that the pin 52 is shorter and the battery side connector pin 52 becomes longer as the voltage is higher. Thereby, when connecting the battery side connector and the board side connector, the timing at which each battery side connector pin is connected to the board side connector pin on the board side connector side by changing the length of the connector pin on the battery side connector side. A time difference can be provided, and by connecting the connector pins in order from the low voltage side, excessive voltage is not applied to the voltage detection circuit, and overloads and failures to the circuit are eliminated. Thus, the reliability of the battery pack can be improved.

  Further, according to the battery pack of the third aspect of the present invention, the battery-side connector 51 is further provided with a power supply pin 58 for supplying driving power to the voltage detection circuit 42, and the power supply. The working pin 58 can be formed to be the same as or longer than the battery-side connector pin 52 having the highest intermediate potential. As a result, the power supply pin for supplying drive power to the voltage detection circuit can be connected first, and the voltage detection circuit can be started at an early stage, which is advantageous in terms of circuit operation.

  Still further, according to the battery pack of the fourth aspect of the present invention, the connection delay means includes the board-side connector pin provided so that the board-side connector 56 corresponds to the intermediate potential of the battery assembly 1. 57, the length of each board-side connector pin 57 is changed so that the board-side connector pin 57 is shorter at the lower voltage side and the board-side connector pin 57 is longer at the higher voltage side. Can do. Thus, when connecting the battery-side connector and the board-side connector, by changing the length of the connector pin on the board-side connector side, there is a time difference in the timing at which each board-side connector pin is connected to the battery-side connector connector pin. In addition, it is possible to avoid excessive voltage being applied to the voltage detection circuit, eliminating overload and failure to the circuit, as connecting from the board connector pin on the low voltage side in order. The reliability of the battery pack can be increased.

  Furthermore, according to the battery pack of the fifth aspect of the present invention, the board-side connector 56 further includes a power supply pin 58 for supplying driving power to the voltage detection circuit 42, and The power supply pin 58 can be formed to be the same as or longer than the board pin connector pin 57 having the highest intermediate potential. As a result, the power supply pin for supplying drive power to the voltage detection circuit can be connected first, and the voltage detection circuit can be started at an early stage, which is advantageous in terms of circuit operation.

  Furthermore, according to the battery pack of the sixth aspect of the present invention, the power supply pin 58 can be provided at a position adjacent to the shortest connector pin. Thereby, long connector pins can be provided on both sides of the end face of the connector, and these long connector pins can serve as a guide when connecting the connectors, which is also preferable in terms of mechanical connection.

  Furthermore, according to the battery pack of the seventh aspect of the present invention, a pin cover body formed in a step shape so as to accommodate a connector pin having a further changed length, and the other connected to the connector pin And a second pin cover body formed in a step shape so as to be engaged with the pin cover body. Thereby, by connecting the pin cover body and the second pin cover body formed in a step shape, it is possible to easily connect the connectors with different pin lengths.

  Furthermore, according to the battery pack of the eighth aspect of the present invention, the connection delay means pivotally connects the battery side connector 51 and the board side connector 56 with the pivot shaft 60 as a rotation axis, The connector pins closer to the pivot shaft 60 may be arranged so that the intermediate potential is lower, and the connector pins farther from the pivot shaft 60 are higher in intermediate potential. As a result, the connection delay means with a simple configuration of connecting the battery side connector and the board side connector with a pivoting pivot shaft connects the connector pin with a low intermediate potential before the connector pin with a high voltage. Therefore, a safe connection can be realized.

  Furthermore, according to the battery pack of the ninth aspect of the present invention, as a configuration for connecting the connector pins of the battery side connector 51 and the board side connector 56, one of the connector pins is the other connector pin. Can be inserted into a cylindrical shape. Thereby, a simple electrical connection structure is realized by the connection between the connector pin and the cylindrical pin hole.

  Furthermore, according to the battery pack connector of the tenth aspect of the present invention, a plurality of unit cells 11 are used for electrical connection inside the battery pack and are accommodated in the battery assembly 1. The battery assembly 1 is connected in series, and a plurality of battery-side connector pins 52 that are respectively electrically connected to the plurality of lead plates 20 respectively arranged at the interface of the series connection between the unit cells 11. A board that is individually connected to a plurality of input terminals of a voltage detection circuit 42 that includes a plurality of battery-side connectors 51 arranged in parallel and a plurality of input terminals for detecting an intermediate potential between the unit cells 11 of the battery assembly 1. A plurality of side connector pins 57 arranged in parallel, and by connecting the battery side connector 51 and the board side connector 56, the battery side connector 51 and the board side connector 56 are connected. The corresponding connector pins of the Kuta 56 are electrically connected so that a plurality of intermediate potentials of the battery assembly 1 can be input to the voltage detection circuit 42, respectively, and the battery-side connector 51 is connected to the battery assembly 51. The length of each battery-side connector pin 52 is changed so that the battery-side connector pin 52 is shorter for the low-voltage side of the intermediate potential of 1, and the battery-side connector pin 52 is longer for the high-voltage side. Can do. Thus, when connecting the battery-side connector and the board-side connector, by changing the length of the connector pin on the battery-side connector side, a time difference is provided in the timing at which each connector pin is connected to the connector pin on the board-side connector side. It is possible to connect the battery pins in order from the connector pin on the lower voltage side, avoiding excessive voltage being applied to the voltage detection circuit, eliminating overload and failure to the circuit, and battery pack Can improve the reliability.

It is a perspective view which shows the battery pack which concerns on embodiment. It is a top view of the battery pack of FIG. It is a longitudinal cross-sectional view in the III-III line of FIG. FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 2. FIG. 3 is a plan view showing a state where an outer case is removed from the battery pack of FIG. 2. It is a disassembled perspective view which shows the state which removed the 1st end surface plate from the battery pack of FIG. It is a disassembled perspective view of the battery pack of FIG. It is the disassembled perspective view which looked at the battery pack of FIG. 7 from the back side. It is a disassembled perspective view which shows the lead plate of the end surface of the battery assembly of FIG. It is a disassembled perspective view which shows the state which connects a lead board to a battery block stage. FIG. 10 is an exploded perspective view showing a state in which battery block stages of the battery assembly of FIG. 9 are connected. It is a disassembled perspective view which shows the state which connects the battery block stage of the battery assembly seen from another angle. It is a disassembled perspective view which shows the state which connects a battery block stage by a lead connection part. It is sectional drawing which shows the state which fixes a battery block step with a penetration screw. It is a perspective view which shows the part of the 1st end surface cover which fastens a penetration screw. It is a perspective view which shows the part of the 2nd end surface cover which fastens a penetration screw. It is a schematic diagram which shows the connection state of the unit cell which comprises the battery assembly of FIG. It is a perspective view of a battery block. It is a perspective view of a battery spacer. It is a perspective view which shows the state which connects battery spacers. It is sectional drawing which shows the state which connected battery spacers. It is a perspective view which shows the lead connection part which concerns on a modification. It is a perspective view which shows the state which connects a battery side connector to a board | substrate side connector. It is the perspective view which looked at FIG. 23 from the back. It is a perspective view which shows the state which connected the battery side connector of FIG. 23 to the board | substrate side connector. 26 (a) is a plan view of FIG. 23, and FIG. 26 (b) is a side view of FIG. 26 (a). FIG. 27A is a perspective view showing a state in which the battery-side connector is partially in contact with the board-side connector in FIG. 26A, and FIG. 27B is a side view of FIG. 28A is a plan view of FIG. 25, and FIG. 28B is a side view of FIG. It is a perspective view which shows the pin cover body which concerns on a modification. It is a top view which shows the state which connected the connector pin to the pin cover body of FIG. It is a top view which shows the example which connected the battery side connector and the board | substrate side connector in the pivot type. It is a perspective view which shows the state which connects one connector block. FIG. 33 is a perspective view showing a state where a plurality of connector blocks of FIG. 32 are connected. It is a schematic diagram which shows a mode that the intermediate potential of a battery block is detected by voltage detection IC. In FIG. 34, it is a schematic diagram which shows a mode that an intermediate potential is connected to a voltage detection IC with a connector. It is a circuit diagram explaining the state in which a high voltage is applied to voltage detection IC by the timing of connection of a connector pin.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery pack and a battery pack connector for embodying the technical idea of the present invention, and the present invention includes the following battery pack and battery pack connector. Not specified. In particular, in this specification, in order to facilitate understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. However, these members are not intended to specify the members shown in the claims as the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
(Embodiment 1)

  Based on FIGS. 1-22, the example applied to the power supply apparatus for assist bicycles as a battery pack which concerns on embodiment of this invention is demonstrated. In these drawings, FIG. 1 is a perspective view showing a battery pack 100 according to the embodiment, FIG. 2 is a plan view of the battery pack 100 in FIG. 1, and FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a plan view showing a state where the outer case 30 is removed from the battery pack 100 in FIG. 2, and FIG. 6 is a first end face table from the battery pack 100 in FIG. FIG. 7 is an exploded perspective view of the battery pack 100 of FIG. 1, FIG. 8 is an exploded perspective view of the battery pack 100 of FIG. 7 viewed from the back side, and FIG. 10 is an exploded perspective view showing the lead plate 20 on the end face of the battery assembly 1, FIG. 10 is an exploded perspective view showing a state in which the lead plate 20 is connected to the battery block stage 2, and FIG. 11 is a battery of the battery assembly 1 in FIG. The exploded perspective view which shows the state which connects the block stage 2, FIG. The exploded perspective view which shows the state which connects the battery block stage 2 of the battery assembly 1 seen from the angle of FIG. 13, FIG. 13 is the exploded perspective view which shows the state which connects the battery block stage 2 with the lead connection part 25, FIG. FIG. 15 is a perspective view showing a part of the first end face cover 31 for fastening the through screw 50, and FIG. 16 is a second end face cover for fastening the through screw 50. FIG. FIG. 17 is a schematic view showing a connection state of the unit cells 11 constituting the battery assembly 1 of FIG. 9, FIG. 18 is a perspective view of the battery block 10, and FIG. 19 is a perspective view of the battery spacer 12. 20 is a perspective view showing a state in which the battery spacers 12 are connected to each other, FIG. 21 is a sectional view showing a state in which the battery spacers 12 are connected together, and FIG. 22 is a perspective view showing a lead connecting portion 25 according to a modification. Respectively To have.

A battery pack 100 shown in these drawings includes a battery assembly 1 to which a plurality of unit cells 11 are connected, a circuit board 40 connected to the unit cells 11, and an outer case 30 that houses them inside. . In the battery pack 100 according to the first embodiment, a plurality of unit cells 11 are held in a horizontal posture by a battery spacer 12 to form a battery block 10, and the battery blocks 10 are connected in the lateral direction to form a battery block stage 2. Further, the battery assembly 1 is configured by connecting the battery block stages 2 in the vertical direction. 7, 8, 9, 17, etc., three battery blocks 10 are connected in the lateral direction to form a battery block stage 2, and further five battery block stages 2 are connected to form a battery assembly. 1 is configured. However, only the leftmost battery block stage 2 in FIG. 5 and FIG. 7 connects two battery blocks 10 and forms an empty space BS by one battery block less than the others. Each battery block 10 has three unit cells 11 stacked vertically in two rows, and a total of six unit cells 11 are connected in parallel. As a result, in the entire battery assembly, 14 unit cells 11 are connected in series, and the output voltage is adjusted to 48V. Since the output voltage of 48V is used in many applications, there is an advantage that it can be applied as it is to a wide range of applications.
(Exterior case 30)

As shown in FIGS. 1 to 5, the outer case 30 is formed in a thin box shape having a width wider than the thickness. Moreover, as shown in FIGS. 6-8, it is set as the box shape which opened the both end surfaces, and the battery assembly 1, the circuit board 40, etc. can be inserted in an inside from an opening part. The outer case 30 has two main surfaces facing each other as a large area, and serves as a heat radiating surface that releases heat generated in the internal battery assembly 1 and the circuit board 40 to the outside. In addition, heat dissipation may be enhanced by providing irregularities 30F (see FIGS. 1 to 2 and 4), fins, and the like on the surface of the main surface to further increase the surface area. The exterior case 30 is made of aluminum having excellent heat dissipation and strength. In addition, in order to insulate a metal outer case such as aluminum, the surface may be covered with a laminate film or vinyl.
(Cross section cover)

Further, both end surfaces of the outer case 30 are closed with end surface plates. In the example of FIG. 7, the left opening end face is closed with the first end face surface plate 31H and the right opening end face is closed with the second end face surface plate 32H, and the end face surface plate is fixed to the exterior case 30 with screws or the like.
(Battery assembly 1)

  As shown in FIGS. 7 to 8 and the like, the battery assembly 1 is inserted into the outer case 30. A circuit board 40 is disposed on one side surface of the battery assembly 1. A protection circuit for protecting the unit cell 11 from overdischarge or overcharge, a charge / discharge circuit, or the like is mounted on the circuit board 40 as necessary.

  As shown in the longitudinal sectional view of FIG. 3 and the transverse sectional view of FIG. 4, the battery assembly 1 has two unit cells 11 stacked one above the other. With such a configuration, each of the unit cells 11 can have the side surface of the cylindrical outer can facing the main surface of one of the two outer casings 30, so that it directly conducts heat to the outer casing 30. And has the advantage of easy heat dissipation. In other words, by not stacking three or more unit cells, there is an advantage that the unit cells that do not face the outer case are eliminated and each unit cell can be cooled uniformly.

In this example, the unit cells 11 are placed in a horizontal posture by the battery spacer 12, and further, the unit cells 11 are arranged along the length direction of the outer can, and the valleys between the unit cells 11 arranged horizontally can be continued. That is, as shown in FIG. 3 and the like, the battery block 10 is connected not only in the lateral direction but also in the length direction of the unit cells 11, so that the integrity of the battery assembly 1 can be increased. . This also leads to effective use of the space. Also, between the upper and lower unit cells 11, the cylindrical unit cells 11 are arranged in a matrix with the center axes aligned. In other words, a space is intentionally created between the unit cells by not arranging the cylindrical unit cells in an offset or staggered arrangement that is eccentric so that the central axes do not coincide with each other.
(Spacer through hole 14)

In particular, the dead space generated by this matrix arrangement is used as the spacer through hole 14 of the through screw 50 that penetrates the entire battery assembly 1 as shown in the sectional view of FIG. In addition, the strength of the battery assembly 1 itself can be improved.
(Through screw 50)

  A plurality of through screws 50 are provided in the length direction of the outer case 30 so as to penetrate the battery assembly 1 in parallel. 9 to 16, in the battery block stage 2 in which the three battery blocks 10 are connected in the lateral direction, the three through screws 50 penetrate the battery assembly 1 so as to penetrate each battery block 10. It is arranged as follows. That is, since each battery block row 3 is penetrated by the penetration screw 50, all the battery blocks 10 are securely fixed, and the battery assembly 1 can be firmly fixed integrally. The through screw 50 is made of metal excellent in strength and heat conduction. Further, the length is designed so as to penetrate the battery assembly 1 in parallel with the length direction of the outer case 30. In the example of FIG. 14, the lower two first through screws 50 </ b> A are long enough to penetrate five battery block rows 3, and the upper one second through screw 50 </ b> B is long enough to penetrate four battery block rows 3. To do.

The battery assembly 1 is configured so that each unit cell 11 is stacked in the vertical direction in a horizontal posture. The battery pack 100 in which the battery blocks 10 are connected in parallel can increase the output current, and the battery pack 100 in which the battery blocks 10 are connected in series can increase the output voltage. In the example of FIG. 17, the unit cells 11 are stacked in two upper and lower stages, each cell block 10 connects six unit cells 11 in parallel, and 14 sets of cell blocks 10 are connected in series to output terminal 33. Connected to. The output terminal 33 is a connector and functions as a communication and charging terminal. Further, as shown in FIGS. 6, 15, and 17, the first end face cover 31 is provided with a positive discharge output terminal 33 + and a negative discharge output terminal 33-and is open to the end face plate 31 </ b> H. It is exposed to the outside through the opening window.
(Battery block 10)

As shown in FIG. 18, each battery block 10 holds six unit cells 11, which are cylindrical secondary batteries, with a battery spacer 12. The battery spacer 12 is composed of a member having excellent insulating properties, and is made of a resin such as plastic. In particular, a material that is elastically deformed somewhat is preferable. The battery spacer 12 is formed vertically and horizontally symmetrical.
(Battery spacer 12)

  In the example of the battery spacer 12 shown in FIG. 18, three battery cells 11 are stacked in two upper and lower stages and have six battery holding surfaces 13 for holding them in a parallel posture. Each battery holding surface 13 has a substantially semicircular shape whose cross section is curved along the cylindrical surface of the unit cell 11, with the upper three open upward and the lower three open downward. .

Thus, by dividing the unit cells 11 into battery block units and connecting them in units of battery blocks, the battery block can be prevented from becoming large and heavy, and the battery block assembly workability can be maintained by keeping the battery blocks small. The advantage that can be improved is obtained.
(Battery block stage 2)

The battery blocks 10 are connected in the lateral direction to constitute the battery block stage 2. Therefore, as shown in FIGS. 11 to 12 and FIGS. 19 to 20, the battery spacer 12 is provided with a spacer connecting portion 16 for connecting another battery spacer 12 to the side surface.
(Spacer connecting part 16)

As shown in FIG. 20, the spacer coupling portion 16 is inserted into a coupling groove 17 opened between the upper and lower battery holding surfaces 13.
(Unit cell 11)

In this way, the battery block stage 2 as shown in FIG. 19 is configured, and the unit cell 11 is held on the battery mounting surface. In the illustrated battery block 10, the unit cell 11 is a unit cell of a lithium ion battery. A battery pack using a lithium ion battery can increase output with respect to volume and weight. However, instead of the lithium ion battery, a lithium polymer battery or a nickel metal hydride battery can be used as the unit cell. Therefore, the present invention does not specify a unit cell as a lithium ion battery, and any unit cell that can be charged can be used as the unit cell. Further, the unit cell 11 is provided with a temperature sensor for temperature detection. In addition to providing a temperature sensor for each unit cell, only the unit cell at a representative position may be monitored.
(Lead plate 20)

  In the battery block 10, the lead plates 20 are fixed to the end electrodes on both ends of the unit cell 11 held by the battery spacer 12 by spot welding or the like, and the unit cells 11 are connected in parallel and in series. Specifically, as shown in FIG. 17, for each battery block 10, the lead plate 20 connects the end faces of the unit cells 11 to connect the unit cells 11 in parallel, and connects the adjacent battery blocks 10 to each other. Connect in series. Thus, in the battery block stage 2 in which the battery blocks 10 are arranged in the horizontal direction, as shown in FIG. 10, the end faces of the unit cells 11 are arranged in substantially the same plane, and the end electrodes face the same plane. Spot welding for fixing the lead plate 20 from both end faces of the step 2 can be performed, which is preferable in terms of work efficiency. The battery block 10 adjusts the shape of the lead plate 20 and the direction of the unit cells 11 held by the battery spacer 12 to optimize the number of unit cells 11 connected in parallel and in series. The output voltage can be adjusted by the number of units 11 connected in series, and the output current can be adjusted by the number of units connected in parallel. Further, as shown in FIGS. 9 to 12, the lead plate 20 is provided with a connection terminal 21 for detecting an intermediate potential. In the circuit board 40, the voltage and current from the connection terminal 21 are input via the lead wire 54 and the connectors 51 and 56 (details will be described later). Further, the lead plate 20 is provided with a lead plate through hole 24 for inserting a through screw 50.

  The lead plate 20 is formed of a thin metal plate having excellent conductivity. In the example of FIG. 10, the first lead plate 20 </ b> A for connecting six unit cells 11 included in one battery block 10 in parallel and the six unit cells 11 also included in one cell block 10 are connected in parallel. And in order to connect in series with the 6 unit cells 11 of the adjacent battery block 10, the 2nd lead board 20B which connects the edge part electrode of the 12 unit cells 11 is used. Further, the first lead plate 20 </ b> A is extended in an L shape so as to extend along the side surface of the battery block stage 2 with the end portion extended to form a lead connection terminal 22. The lead connection terminal 22 has a connection terminal screw hole 23 for connection to a lead connection portion 25 described later.

  As shown in FIG. 16, one end of the lead wire 20L is fixed to the negative side lead plate 20E- of FIG. 9, and the negative output of the battery assembly 1 is further reduced by the metal first through screw 50A-. Screwed to one end. The other end of the lead wire 20L is electrically connected to a circuit board 40 described later for charging. Further, as shown in FIG. 15, the other end of the first through screw 50A- appears on the surface side of the first end face cover 31 and is screwed to the metal terminal plate 33-P in the discharge output terminal 33-. . In this way, a part of the through screw can also be used as a conductive lead. In particular, as the through screw used as the conductive lead, a material obtained by plating a copper material with nickel can be preferably used in consideration of electrical conductivity. Further, other through screws not used as conductive leads can use materials such as iron and stainless steel. Thus, the minus side output of the battery assembly 1 is output from the minus side convex portion 33-T connected to the metal terminal plate 33-P. In addition, the metal terminal plate 33-P includes an integrally provided shunt resistor portion 33-S, and the voltage drop at this portion is connected to the circuit board 40 via a lead wire or the like, so that the voltage drop The current value corresponding to is measured.

On the other hand, the plus side output of the battery assembly 1 is outputted from the plus side lead plate 20E + as disclosed in FIG. Furthermore, it is electrically connected to a circuit board 40 described later via a lead wire for charging. Further, the output from the plus-side lead plate 20E + appears on the surface side of the first end surface cover 31 as disclosed in FIG. 15, and is screwed to the metal terminal plate 33 + P in the discharge output terminal 33+. Furthermore, it outputs from the positive side convex part 33 + T connected to metal terminal board 33 + P.
(Lead connection part 25)

  The battery block stages 2 thus obtained are further connected in the length direction of the unit cell 11 to constitute the battery assembly 1. For this reason, the lead plates 20 are connected to each other by the lead connecting portion 25. As shown in FIGS. 11 to 13, the lead connecting portion 25 is a flat plate made of metal like glasses, and couples a pair of fixed pieces 26. Each fixing piece 26 is provided with a screw hole 27. Each fixing piece 26 is formed to be approximately the same size as the lead connection terminal 22. Further, the metal plate constituting the lead connection portion 25 is thicker than the lead plate 20 and increases the mechanical strength.

On the other hand, the lead plate 20 to be connected as described above is provided with lead connection terminals 22 each having a connection terminal screw hole 23 opened. A screw receiving portion is opened on the side surface of the battery spacer 12. With this configuration, the lead connection portion 25 can be screwed to the lead connection terminal 22 with the lead connection screw 28. At the same time, it can be fixed to the battery spacer 12 with the lead connection screw 28. As a result, the lead plates 20 are electrically connected to each other, and the battery spacers 12 are mechanically connected to each other by the lead connecting portion 25 of a metal plate thicker than the lead plate 20, thereby increasing the physical connection strength. it can. As shown in FIGS. 9 and 17, the lead connection portions 25 alternately connect the upper and lower battery block stages 2 on both side surfaces of the battery assembly 1. As a result, the battery blocks 10 can be connected in series in a zigzag manner, and the number of serial connections can be increased in a limited space to increase the output.
(Insulation sheet 35)

When the battery block stages 2 are connected as described above, as shown in FIG. 13 and the like, the insulating sheet 35 is interposed so that the lead plate 20 does not short-circuit at the interface between the battery block stages 2 facing each other. As the insulating sheet 35, paper, plastic film or the like having excellent insulating properties can be used. The insulating sheet 35 has a sheet through hole 36 for inserting the through screw 50. Thereby, positioning and holding | maintenance of the insulating sheet 35 are realizable by opening the connection terminal through-hole 24 opened by the sheet | seat through-hole 36 and the lead board 29, and letting the penetration screw 50 pass.
(Circuit board 40)

  The battery assembly 1 configured as described above appears almost diagonally as shown in FIG. Therefore, the positive and negative outputs are connected to the circuit board 40 via the lead plate 20 and the lead wires, and are connected to the output terminal 33 via the protection circuit mounted on the circuit board 40. The circuit board 40 is a board on which a circuit necessary for driving the power supply device and its components, elements, and the like, such as a charge / discharge circuit and a protection circuit for controlling the charge / discharge current of each battery block 10, are mounted. Is available. In FIG. 17, the circuit board 40 is disposed on the side surface side of the battery assembly 1 so as to face the side surface on the long side of the exterior case 30 in a state inserted into the storage frame 40 </ b> W (see FIG. 7 and the like). Yes. The circuit board 40 connects the output of the battery assembly 1 to the output terminal 33. Further, the output of a temperature sensor or the like that detects the intermediate potential or the temperature of the unit cell is also appropriately connected via the lead wire 54 and the connectors 51 and 56.

On the other hand, various battery information (for example, battery voltage, current, temperature, abnormal condition) is communicated to an external electronic device via the output terminal 33 by the function of the microcomputer mounted on the circuit board 40. At the time of charging, charging is performed through the charging FET element mounted on the circuit board 40 via the output terminal 33. When an abnormality occurs, the charging FET element is turned off to interrupt charging. As disclosed in the above-described structure, at the time of discharging, the discharge is performed from the positive discharge output terminal 33+ and the negative discharge output terminal 33- without passing through the circuit board 40. Note that a fuse or the like can be added so that the battery can be discharged through the fuse or the like during charging and discharging.
(connector)

Next, the structure of the connector for connecting the battery assembly 1 to the circuit board 40 will be described with reference to FIGS. In these drawings, FIG. 23 is a perspective view showing a state in which the battery side connector 51 is connected to the board side connector 56, FIG. 24 is a perspective view of FIG. 23 viewed from the back, and FIG. 25 is a perspective view of the battery side connector 51 of FIG. The perspective view which shows the state connected with the board | substrate side connector 56, FIG.26 (a) is a top view of FIG. 23, FIG.26 (b) is a side view of FIG.26 (a), FIG.27 (a) is FIG.26 (a). ) Is a perspective view showing a state in which the battery-side connector 51 is partially in contact with the board-side connector 56, FIG. 27 (b) is a side view of FIG. 26 (a), and FIG. 28 (a) is a plan view of FIG. FIG. 28B shows a side view of FIG.
(Connector pin)

  Each of the battery-side connector 51 and the board-side connector 56 includes a plurality of connector pins (battery-side connector pins 52 and board-side connector pins 57), and is brought into conduction by bringing the connector pins into contact with each other. For example, as shown in FIG. 24, the connector pin has a columnar shape with one connector pin and a cylindrical shape into which the columnar pin can be inserted, and the columnar pin is inserted into the cylindrical pin. Thus, both can be electrically connected. As another structure, a structure in which a connector pin is inserted between a pair of plate members to sandwich the side surface of the connector pin can be used. Thus, a known configuration can be used as appropriate for the connection structure between the connector pins. Such a known connection structure is also referred to as a structure using connector pins in this specification. Therefore, in this specification, the term “connector pin” is not limited to a cylindrical connector pin, but is used to include a member that can be connected to a conductive state, such as a pipe or cap into which the connector pin is inserted, or a plate material that sandwiches the connector pin.

The battery-side connector 51 and the board-side connector 56 each include a cover body that fixes a plurality of connector pins spaced apart in a parallel posture. Further, this battery pack includes connection delay means for connecting a connector pin having a low intermediate potential before a connector pin having a high voltage when connecting the battery side connector 51 and the board side connector 56. . As an example of the connection delay means, a configuration in which the lengths of either one of the connector pins are mutually changed can be employed. Specifically, in the example of FIG. 26, the length of the board-side connector pin 57 is changed stepwise while the length of the battery-side connector pin 52 is constant.
(Battery side connector 51)

  As shown in FIGS. 23 and 24, the battery-side connector 51 has a box-shaped battery-side pin cover body. The battery-side pin cover body is formed of plastic or the like having excellent insulating properties, and a pin hole for inserting the board-side connector pin 57 is opened on the end face connected to the board-side connector 56. Inside the pin holes, battery-side connector pins 52 that contact the outer periphery of the board-side connector pins 57 are provided. These connector pins are made of a metal such as copper having excellent electrical conductivity. In the example of FIG. 26, the lengths of the battery-side connector pins 52 are the same. However, the length of the battery-side connector pin 52 may be changed stepwise according to the length of the board-side connector pin 57. A lead wire 54 is connected to each battery-side connector pin 52. The lead wires 54 are drawn out from the end surface opposite to the end surface connected to the board-side connector 56, and each is connected to the connection terminal 21 of the lead plate 20.

Further, a locking piece 53 for connecting to the board side connector 56 is provided on the upper surface of the battery side pin cover body. The locking piece 53 is preferably provided by integral molding with the battery side pin cover body. As shown in FIGS. 25 to 28 and the like, the locking piece 53 projects over the entire surface from the upper surface of the battery-side pin cover body, and has an arrowhead-shaped locking surface protruding at the tip. The protruding locking surface forms a distance between the end surface connected to the board-side connector 56 substantially equal to the thickness of the board-side connector 56. An inclined surface is provided in front of the locking surface. As shown in FIGS. 26, 27, and 28, the locking piece 53 pushes the battery-side connector 51 toward the board-side connector 56, so that the inclined surface comes into contact with the board-side connector 56 and is elastically deformed. The stop surface is locked to the back surface of the board-side connector 56, and the battery-side connector 51 is locked to the board-side connector 56.
(Board side connector 56)

  On the other hand, as shown in FIG. 26 and the like, the board-side connector 56 has a board-side pin cover body and holds a plurality of board-side connector pins 57 spaced apart from each other in parallel. Each board-side connector pin 57 penetrates through the board-side pin cover body and bends the tip downward to be soldered to the circuit board 40. Further, the board-side pin cover body is wired to the input terminal of the voltage detection circuit 42. The voltage detection circuit 42 is configured by an IC or the like, for example.

Moreover, the length of each board | substrate side connector pin 57 is changed in steps. Specifically, according to the intermediate potential of the battery-side connector pin 52 that is the connection destination, the lower intermediate potential is formed longer. Accordingly, when the battery side connector 51 is to be connected to the board side connector 56, the lower one of the intermediate potential protrudes, so that the connection is made earlier than the other connector pins. The potential difference applied to the side can be reduced. As a result, it is possible to avoid a situation where a voltage in which the unit cells 11 are connected in series, which has been a problem in the past, is directly applied to the voltage detection circuit 42, and the voltage detection circuit 42 can be protected from a high voltage. The most protruding board-side connector pin 57 may be a ground (= minus) terminal. In the example of FIG. 26 and the like, the most protruding board-side connector pin 57 and the power supply pin 58 have the same length, but the board-side connector pin 57 that is the ground terminal is the most. The protrusion can be made longer than the power supply pin 58 and connected earlier to prevent undesired connections, sparks, and the like.
(Power supply pin 58)

  Further, the board-side connector 56 can add power supply pins 58 to the board-side connector pins 57. The power supply pin 58 is a voltage line for supplying driving power for driving the voltage detection circuit 42. Among the voltages obtained from the battery assembly 1, a voltage suitable for driving the voltage detection circuit 42 is used. Applied. Here, the power supply pin 58 has substantially the same length as the longest connector pin among the board-side connector pins 57. As a result, the power supply pins 58 are connected earliest before other connector pins. Thereby, the voltage detection circuit 42 can be started from an early stage, which is advantageous in terms of circuit operation. In addition, by arranging the long power supply pins 58 on the end face of the connector adjacent to the shortest connector pin, the long connector pins can be arranged on both sides of the end face of the connector. Accordingly, the high voltage power supply line is separated on both sides to enhance safety, and these long connector pins can serve as a guide when connecting the connectors, which is also preferable in terms of mechanical connection. In particular, in the case of a stepped connector pin, since the shape becomes distorted, it must be connected from the long side, that is, from one side of the connector, and it becomes difficult to connect. On the other hand, by projecting long connector pins from both sides, the connectors can be connected in the manner of connecting these long projecting connector pins first, so that the connecting operation between the connectors becomes smooth.

  On the other hand, the connector pins positioned at both ends of the connector may be in an insulated state without energizing electricity and simply for mechanical connection. Similarly, by not using a part of the connector pin even in the middle, it is effective for increasing mechanical strength and preventing short circuit.

  The above configuration is an example for realizing the connection delay means, and the length and arrangement of the connector pins may be formed so that the one with a relatively low intermediate potential is connected earlier. For example, the same effect can be obtained even if the length of the board-side connector pin 57 is made constant and the length of the battery-side connector pin 52 is changed stepwise, contrary to the above.

  Further, in the above example, the connector pins are protruded with different lengths. However, the receiving side of the connector pins can be formed in a step shape. For example, in the example shown in FIG. 29, by forming the pin cover body 59 provided with pin holes for inserting connector pins in a step shape, as shown in FIG. It can comprise so that it may connect in an order from the pin hole protruded in this.

  Further, the connector pins may be accommodated in the pin cover body 59 without protruding. For example, in FIG. 29, the second pin cover body is formed in a step shape corresponding to the stepped contact surface of the pin cover body 59 provided with the pin hole, and the connector pin is accommodated in the second pin cover body. The connector pin may be inserted into the pin hole by engaging the cover body 59 and the second pin cover body.

  Furthermore, as another modification of the connection delay means, the battery side connector and the board side connector may be connected in an arc shape. For example, in the example shown in FIG. 31, the battery-side connector 51B and the board-side connector 56B are connected in a pivotal manner at one end side, and the connectors are connected so as to pivot. With this method, since the connector pins are connected from the side closer to the pivot shaft 60, the arrangement of the connector pins is set so that the closer to the pivot shaft 60, the lower the intermediate potential is. With this method, it is possible to provide a time difference in connecting the connector pins without changing the length of the connector pins. Although not shown, the power supply pin supplies power to the voltage detection circuit 42 first, for example, by arranging positive and negative power supply pins on the two connector pins closest to the pivot shaft 60. It becomes possible. Alternatively, a power supply line may be prepared separately from these connectors, and the power supply line may be connected prior to connector connection. This method allows safe connection without changing the pin length.

  Alternatively, the connector may not be an assembly of a plurality of connector pins, but may be disassembled for each connector pin and connected one by one. For example, in the example shown in FIGS. 32 and 33, the battery-side connector connected to the board-side connector 56C is a connector block 61 in which only the intermediate potential of one lead plate 20 is drawn out by the lead wire 54, and the other connector block. The connection structure for connecting with 61 is provided. In the illustrated example, a dovetail groove is provided on one surface of the connector block 61, and a protrusion that can be inserted into the dovetail groove is formed on the opposite surface. As a result, the connector blocks can be connected to each other. In this configuration, the intermediate potential can be input to the voltage detection circuit 42 one by one by connecting the connector block 61. Therefore, by connecting the connector block 61 in order from the low potential, there is an advantage that it is possible to reliably prevent the high voltage from being applied to the voltage detection circuit 42. Further, in this configuration, the battery assembly 1 can be safely separated without applying a high voltage to the voltage detection circuit 42 by removing the connector block 61 in order from the one having the highest voltage even when disassembling. it can. According to this method, it is possible to connect safely without changing the length of the pins, but it is not possible to connect them together by a connector.

  As described above, the intermediate potential can be safely connected to and disconnected from the voltage detection circuit 42, so that an unintended failure of the voltage detection circuit 42 and elements connected to the voltage detection circuit 42 can be avoided and reliability can be avoided. High battery pack is available.

  The battery pack and the battery pack connector according to the present invention can be suitably used as an electric scooter, a power supply device for an assist bicycle, or the like.

DESCRIPTION OF SYMBOLS 100 ... Battery pack 1, 1 '... Battery assembly 2 ... Battery block stage 2A ... First battery block stage 2B ... Second battery block stage 3 ... Battery block row 10 ... Battery block 11 ... Unit cell 12 ... Battery spacer 13 ... Battery holding surface 14 ... Spacer through hole 15 ... Cover body 16 ... Spacer connecting portion 17 ... Connecting groove 20, 20 '... Lead plate 20A ... First lead plate 20B ... Second lead plate 20E -... Negative side lead plate 20E + ... Plus Side lead plate 20L ... lead wire 21 ... connecting terminal 22 ... lead connecting terminal 23 ... connecting terminal screw hole 24 ... connecting terminal through hole 25 ... lead connecting portion 26 ... fixing piece 27 ... screw hole 28 ... lead connecting screw 29 ... folding Curved piece 30 ... exterior case 30F ... irregularities 31 ... first end face cover 31H ... first end face surface plate 32 ... second end face cover 32H ... second end face surface plate 33 ... output terminal 33+ ... Polar discharge output terminal 33 -... Negative discharge output terminal 33-P ... Metal terminal plate 33-T ... Minus side convex portion 33-S ... Shunt resistor portion 33 + P ... Metal terminal plate 33 + T ... Positive side convex portion 35 ... Insulating sheet 36 ... Sheet through hole 40 ... Circuit board 40W ... Storage frame 42 ... Voltage detection circuit 42B ... Voltage detection IC
50 ... through screw 50A, 50A -... first through screw 50B ... second through screw 51, 51B ... battery side connector 52 ... battery side connector pin 53 ... locking piece 54 ... lead wires 56, 56B, 56C ... board side connector 57 ... Board side connector pin 58 ... Power supply pin 59 ... Pin cover body 60 ... Pivot shaft 61 ... Connector block BS ... Free space

Claims (10)

A battery assembly (1) in which a plurality of unit cells (11) are connected in series;
A plurality of lead plates (20), each disposed at a serial connection interface between the unit cells (11), and
The plurality of lead plates (20) and battery side connector pins (52) electrically connected to each other, a plurality of parallel battery side connectors (51), and
A voltage detection circuit (42) comprising a plurality of input terminals for detecting an intermediate potential between the unit cells (11) of the battery assembly (1);
A board-side connector (56) in which a plurality of board-side connector pins (57) individually connected to a plurality of input terminals of the voltage detection circuit (42) are arranged in parallel, and
With
By connecting the battery side connector (51) and the board side connector (56), the corresponding connector pins of the battery side connector (51) and the board side connector (56) are electrically connected, and the battery assembly A battery pack capable of inputting a plurality of intermediate potentials of the body (1) to the voltage detection circuit (42), respectively,
When connecting the battery side connector (51) and the board side connector (56), it is provided with a connection delay means for connecting a connector pin having a low intermediate potential before a connector pin having a high voltage. A battery pack characterized by The battery pack according to claim 1,
In the connection delay means, the battery-side connector (51), the battery-side connector pin (52) is shorter as the low-voltage side of the intermediate potential of the battery assembly (1), the high-voltage side A battery pack characterized by being configured by changing the length of each battery-side connector pin (52) so that the battery-side connector pin (52) becomes longer. The battery pack according to claim 2, further comprising:
The battery side connector (51) is provided with a power supply pin (58) for supplying driving power to the voltage detection circuit (42), and
The battery pack is characterized in that the power supply pin (58) is formed to be the same as or longer than the battery-side connector pin (52) having the highest intermediate potential. The battery pack according to claim 1,
Among the board-side connector pins (57) provided so that the connection delay means corresponds to the intermediate potential of the battery assembly (1) for the board-side connector (56), the lower voltage side is the board side. The length of each connector pin (57) is changed so that the connector pin (57) is shorter and the connector pin (57) on the higher voltage side is longer. Battery pack. The battery pack according to claim 4, further comprising:
The board-side connector (56) is provided with a power supply pin (58) for supplying driving power to the voltage detection circuit (42), and
The battery pack is characterized in that the power supply pin (58) is formed to be the same as or longer than the board connector pin (57) having the highest intermediate potential. The battery pack according to claim 5,
The battery pack according to claim 1, wherein the power supply pin (58) is provided at a position adjacent to the shortest connector pin. The battery pack according to any one of claims 1 to 6, further comprising:
A pin cover body (59) formed in a step shape so as to accommodate the connector pins whose length has been changed,
A second pin cover body formed in a step shape so as to accommodate the other connector pin connected to the connector pin and engage with the pin cover body (59),
A battery pack comprising: The battery pack according to claim 1,
The connection delay means connects the battery side connector (51) and the board side connector (56) in a pivotal manner with a pivot shaft (60) as a rotation axis, and a connector pin on the side close to the pivot shaft (60). The battery pack is characterized in that the intermediate potential is lower as the intermediate potential is lower, and the connector pin on the side farther from the pivot shaft (60) is higher in intermediate potential. The battery pack according to any one of claims 1 to 8,
As a configuration for connecting the connector pins of the battery side connector (51) and the board side connector (56), one of the connector pins is formed in a cylindrical shape into which the other connector pin can be inserted. pack. A connector used for electrical connection inside the battery pack,
A battery assembly (1) housed in the battery assembly (1), in which a plurality of unit cells (11) are connected in series, each arranged at the interface of the series connection between the unit cells (11). A battery side connector (51) in which a plurality of lead plates (20) and a plurality of battery side connector pins (52) for electrical connection are arranged in parallel,
Board-side connector pins individually connected to a plurality of input terminals of a voltage detection circuit (42) including a plurality of input terminals for detecting an intermediate potential between unit cells (11) of the battery assembly (1). 57), a plurality of board-side connectors (56) arranged in parallel,
With
By connecting the battery side connector (51) and the board side connector (56), the corresponding connector pins of the battery side connector (51) and the board side connector (56) are electrically connected, and the battery assembly A plurality of intermediate potentials of the body (1) can be input to the voltage detection circuit (42), respectively.
Among the intermediate potentials of the battery assembly (1), the battery side connector (51) has a shorter battery side connector pin (52) for a low voltage side and a battery side connector pin (52 for a high voltage side). The battery pack connector is characterized in that the length of each battery-side connector pin (52) is changed so that the length of the connector is longer.

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