WO2020032081A1

WO2020032081A1 - Battery pack

Info

Publication number: WO2020032081A1
Application number: PCT/JP2019/031024
Authority: WO
Inventors: 生井邦明; 松元隆志; 滝沢大二郎
Original assignee: 本田技研工業株式会社
Priority date: 2018-08-07
Filing date: 2019-08-07
Publication date: 2020-02-13
Also published as: JPWO2020032081A1

Abstract

A battery-side conduction connector (22) is disposed on a bottom surface of a case (12) housing battery packs (14, 16). The conduction connector (22) has one first terminal (for example, a female positive electrode terminal (66)) having a first polarity and two second terminals (for example, female negative electrode terminals (68a, 68b)) having a second polarity. The first terminal is positioned in a center part of the bottom surface, and the two second terminals are line-symmetrically disposed with respect to the first terminal.

Description

Battery pack

The present invention relates to a battery pack having a conduction connector provided on a bottom surface.

バッテリ Battery packs are detachably mounted on electric vehicles such as electric assist bicycles and electric motorcycles. This type of battery pack is configured such that a battery core pack having a plurality of single cells is housed in a hollow interior of a case. The single cell is, for example, a lithium secondary battery, and is charged when the capacity is reduced to some extent. As a result, the capacity is restored, and re-discharge becomes possible.

装置 A device-side conduction connector is provided at the bottom of the battery storage case of the electric vehicle or the battery receiving portion of the charger. In particular, as described in paragraphs [0042] and [0043] of JP-A-2013-164969 and FIG. 2, the device-side conduction connector is a battery pack ("Battery module in JP-A-2013-164969"). ") Is electrically connected to a battery-side conduction connector provided on the bottom surface of the battery. Generally, the device-side conduction connector is a male connector, and the battery-side conduction connector is a female connector. That is, the male terminal that forms the male connector is inserted into the female terminal that forms the female connector. As a result, power can be supplied from the battery pack to the electric vehicle or the like, and conversely, power can be supplied from the charging device to the battery pack.

差し In order to insert the device-side conduction connector into the battery-side conduction connector, it is necessary to align the position of the battery-side conduction connector with the position of the device-side conduction connector. That is, the user must visually check the bottom surface of the battery pack and adjust the orientation and posture of the battery pack so that the battery-side conduction connector and the device-side conduction connector are on the same axis. Such confirmation work and adjustment are complicated, and it is hard to say that the user is excellent in usability.

主 A main object of the present invention is to provide a battery pack which does not require a confirmation operation for aligning conductive connectors.

Another object of the present invention is to provide a battery pack that is excellent in convenience.

To achieve the above object, according to one embodiment of the present invention, there is provided a case for accommodating a battery core pack having a plurality of single cells, and the bottom of the case is electrically connected to the single cells. A battery pack provided with a conduction connector to be connected,
The conduction connector has one first terminal indicating a first polarity and two second terminals indicating a second polarity,
A battery pack is provided, wherein the first terminal is located at the center of the bottom surface, and the two second terminals are disposed with the first terminal being a line symmetry center.

The “first polarity” is either the positive electrode or the negative electrode, and accordingly, the “first terminal” is the positive terminal or the negative terminal. In addition, the “second polarity” is one of the remaining negative electrode and the positive electrode, and the “second terminal” is one of the negative electrode terminal and the remaining one of the positive electrode terminal. For example, when the first terminal is a positive terminal, the second terminal is a negative terminal, and when the first terminal is a negative terminal, the second terminal is a positive terminal.

By arranging the electrode terminals as described above, the battery-side conduction connector and the external load connection can be provided both when the battery pack is oriented normally and when the battery pack is turned 180 ° from the normal orientation. The two-way connector can be electrically connected by engaging the universal connector or the electrical connector of the charging device. Therefore, it is not necessary for the user to look into the bottom surface of the battery pack to check the orientation of the battery pack or to twist the wrist so that the bottom surface can be visually recognized. To this extent, the battery pack can be easily attached to an external load or a charging device, and the convenience is improved.

底面 The bottom surface of the case is preferably rectangular in plan view. In this case, the position of the center of the bottom surface can be easily obtained. Therefore, the positioning of the conduction connectors is facilitated, and the conduction connectors can be reliably engaged with each other. When the battery pack is rectangular, the long side of the bottom surface interferes with the external load and the short side of the opening of the battery storage case of the charging device when the battery pack is rotated 90 ° from the normal direction. Therefore, it is possible to prevent the battery pack from being inserted into the battery storage case in this direction.

長方形 In this case, the rectangle in this case includes not only a rectangle whose vertex is a right angle, but also a rectangle whose apex is chamfered to form an R portion. Further, “rectangle” includes “square”.

個数 The number of first terminals is smaller than that of second terminals. Therefore, at the second terminal, a current that is exchanged with the external load or the second terminal of the conduction connector of the charging device branches. For this reason, compared with the contact area between the first terminal and the external load or the first terminal of the conduction connector of the charging device, the individual second terminals and the individual first terminals of the conduction connector of the external load or the charging device are compared. The contact area with the two terminals can be reduced. Accordingly, the size of the second terminal and, consequently, the size of the conduction connector can be reduced.

According to the present invention, the conduction connector provided on the bottom surface of the battery pack is disposed at the center of the bottom surface and has one first terminal exhibiting the first polarity, and the first terminal is disposed with the first terminal as a line symmetry center. And two second terminals having the second polarity. Therefore, regardless of whether the battery pack is in the normal orientation or when the battery pack is inverted by 180 ° from the normal orientation, the conduction connector is engaged with the external load or the conduction connector of the charging device so that both ends are engaged. The conduction connector can be electrically connected.

Therefore, it is unnecessary for the user to check the orientation of the battery pack in advance. Thus, the battery pack can be easily mounted on an external load or a charging device, and the convenience is improved.

1 is a schematic overall perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the battery pack. It is a bottom view of the bottom case which comprises a case. FIG. 3 is a schematic vertical sectional view of a battery-side connector (conduction connector) provided in a battery pack. It is a schematic perspective view of the apparatus side connector (conduction connector) provided in the external load. It is a principal part longitudinal cross-sectional view which shows the state which made the battery pack the normal direction with the battery pack facing the apparatus side connector to the battery side connector. FIG. 7 is an essential part longitudinal cross-sectional view showing a state where the electrode terminal of the device-side connector is inserted into the electrode terminal of the battery-side connector from FIG. 6. It is a principal part longitudinal cross-sectional view which shows the state which turned the battery pack 180 degree | times from a normal direction, and made the apparatus side connector face the battery side connector. FIG. 9 is a longitudinal sectional view of a main part showing a state where the electrode terminal of the device-side connector is inserted into the electrode terminal of the battery-side connector from FIG. 8.

Hereinafter, preferred embodiments of a battery pack according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 are a schematic overall perspective view and a schematic exploded perspective view, respectively, of a battery pack 10 according to the present embodiment. In order to facilitate understanding of the configuration of the battery pack 10, the battery pack 10 is in the lying position in FIGS. 1 and 2, but the battery pack 10 mainly has a longitudinal direction (height direction) in the direction of gravity. It is used in a posture extending along or a posture in which the longitudinal direction is inclined with respect to the direction of gravity.

The battery pack 10 has a hollow square prism-shaped case 12 having both ends opened, and a first battery core pack 14 and a second battery core pack 16 (see FIG. 2) housed in the hollow interior of the case 12. . The case 12 includes a case body 17, a bottom case 18 for closing a bottom opening of the case body 17, and a top case 20 for closing a ceiling opening. Power is supplied (discharged) from the first battery core pack 14 and the second battery core pack 16 to the window 21 formed in the bottom case 18, or the first battery core pack 14 and the second battery core pack 16 A battery-side connector 22, which is a conduction connector for supplying (charging) power to the battery, faces. On the other hand, a handle 24 for holding the battery pack 10 when the user lifts or transports the battery pack 10 is formed in the top case 20 in an arch shape.

The first battery core pack 14 is configured by holding a plurality of single cells 30 in the first cell holder 32. In this case, the single cell 30 has a columnar shape, and a positive electrode terminal and a negative electrode terminal (both not shown) are provided at both ends in the axial direction. A preferred example of the single cell 30 includes a lithium ion secondary battery, but is not particularly limited thereto, and may be another secondary battery such as a nickel hydrogen battery or a nickel cadmium battery.

In the first cell holder 32, a plurality of cell receiving holes 34 are formed so as to penetrate with a diameter and a length corresponding to the diameter and the height of the single cell 30, and the single cells 30 are individually formed in the respective cell receiving holes 34. Inserted and held. Similarly to the first battery core pack 14, the second battery core pack 16 has a second cell holder 36 in which a cell accommodation hole 34 is formed, and is configured by holding the single cell 30 in the cell accommodation hole 34. ing. The first battery core pack 14 and the second battery core pack 16 are configured such that the unit cells 30 are oriented such that the longitudinal direction thereof is orthogonal to the vertical direction of the battery pack 10 and the case 12 (mainly the case body). 17). A positive electrode terminal and a negative electrode terminal are respectively provided on both bottom surfaces, which are end surfaces in the longitudinal direction.

The cell receiving holes 34 are arranged in parallel along the horizontal direction (the vertical direction in FIG. 2) of the first cell holder 32 and the second cell holder 36. One row of the cell receiving holes 34 arranged in a direction perpendicular to the longitudinal direction forms a receiving hole row 37. In an arbitrary accommodation hole row 37 of the first battery core pack 14, the single cell 30 is accommodated in the cell accommodation hole 34 such that the positive electrode terminal faces the second battery core pack 16, for example. On the other hand, in another housing hole array 37 adjacent to the housing hole array 37, the single cell 30 is housed in the cell housing hole 34 such that the negative electrode terminal faces the second battery core pack 16. Since this alternate arrangement is repeated, the electrode terminals of the opposite polarity face the same direction in the adjacent accommodation hole row 37.

Then, the positive electrode terminal of an arbitrary accommodation hole array 37 and the negative electrode terminal of another adjacent accommodation hole array 37 are electrically connected in series by the same bus bar 38. The same applies to the second battery core pack 16. The bus bar 38 connecting the single cells 30 in the lowermost accommodation hole row 37 of the first battery core pack 14 and the single cells 30 in the lowermost accommodation hole row 37 of the second battery core pack 16 is a bottom case. The portion facing 18 has a curved shape and protrudes from the clearance between the first battery core pack 14 and the second battery core pack 16.

The case main body 17 mainly housing the first battery core pack 14 and the second battery core pack 16 has an outer frame 40 and a partition wall 42 integrally connected to the outer frame 40. The partition wall 42 extends along the up-down direction of the case main body 17 and divides the hollow interior of the case main body 17 into a first inner chamber 44 and a second inner chamber 46 having substantially the same volume. The first battery core pack 14 is housed in a first inner chamber 44, and the second battery core pack 16 is housed in a second inner chamber 46.

The first battery core pack 14 and the second battery are disposed between the top case 20 and the upper surfaces of the first battery core pack 14 (first cell holder 32) and the second battery core pack 16 (second cell holder 36). A battery management unit (BMU) 50 which is a control unit for managing the temperature and voltage of the core pack 16 is inserted. The BMU 50 also functions as a communication unit that performs communication with the electric vehicle and the charging device.

Next, the battery-side connector 22 and the device-side connector 60 (both of which are conductive connectors) will be described in detail with reference to FIGS.

底面 As shown in FIG. 3, the bottom surface of the bottom case 18 has a rectangular shape in plan view, and a window 21 is opened at the center of the bottom surface. A pedestal 62 that constitutes the battery-side connector 22 is visible from the window 21. The pedestal 62 is an insulator made of, for example, an insulating resin or the like, and is supported by the bottom case 18.

The pedestal 62 has a substantially rectangular parallelepiped shape, and its bottom surface faces the window 21. As shown in FIG. 4, the pedestal 62 is formed with three terminal receiving holes 64a to 64c extending vertically from the bottom surface. In other words, the terminal receiving holes 64a to 64c are arranged in a straight line along the longitudinal direction (height direction) of the battery pack 10.

電極 The electrode terminals are accommodated in the terminal accommodation holes 64a to 64c. Assuming that the positive electrode has the first polarity and the negative electrode has the second polarity, in the present embodiment, the female positive terminal 66 as the first terminal having the first polarity is accommodated in the terminal accommodating hole 64b, and the terminal accommodating hole 64a is provided. , 64c accommodate female

negative terminals

68a, 68b as second terminals having the second polarity, respectively. That is, the battery-side connector 22 has one female positive terminal 66 and two female

negative terminals

68a and 68b. The female positive terminal 66 and the female

negative terminals

68a, 68b are both female terminals, and the battery-side connector 22 is a female connector. The female positive electrode terminal 66 and the female

negative electrode terminals

68a, 68b are good conductors made of metal such as copper, for example.

Note that, of course, the female positive terminal 66 is electrically connected to the positive terminal of the single cell 30 and the female

negative terminals

68a and 68b are electrically connected to the negative terminal of the single cell 30.

Here, the intersection of the bisector L1 of the two

long sides

70a, 70b on the bottom surface of the bottom case 18 and the bisector L2 of the two

short sides

72a, 72b is the center of the bottom surface. . The female positive electrode terminal 66 is disposed at the center thus determined. On the other hand, the two female

negative electrode terminals

68a and 68b are provided with the female positive electrode terminal 66 as the center of line symmetry (or rotational symmetry). That is, the female

negative terminals

68a and 68b are located at positions sandwiching the female positive terminal 66, and the female negative terminal 68a, the female positive terminal 66, and the female negative terminal 68b are arranged on the same straight line. The distance from the female negative terminal 68a to the female positive terminal 66 is the same as the distance from the female negative terminal 68b to the female positive terminal 66. Note that “identical” in this specification includes an error within an allowable range, and the same applies hereinafter.

As can be understood from FIG. 3, the length of the female positive electrode terminal 66 along the

short sides

72a, 72b of the bottom case 18 is equal to the

short sides

72a, 72b of the female

negative electrode terminals

68a, 68b. It is set larger than the length along. Therefore, the female positive terminal 66 has a larger area than the female

negative terminals

68a and 68b.

Furthermore, two

guide holes

74a, 74b formed at positions sandwiching the terminal receiving holes 64a to 64c are opened on the lower surface of the pedestal 62. The distance from the guide hole 74a to the terminal receiving hole 64a is the same as the distance from the guide hole 74b to the terminal receiving hole 64c. As will be described later, the battery pack 10 is positioned and fixed as the positioning pins 84a and 84b are inserted into the guide holes 74a and 74b.

台 The pedestal 62 configured as described above is positioned and fixed to the bottom case 18 by, for example, screws (not shown).

The battery pack 10 is mounted on, for example, an electric vehicle such as an electric assist bicycle or an electric motorcycle, and functions as a power supply source for energizing a motor as an external load. These electric vehicles are provided with a battery storage case 76 for storing the battery pack 10 as shown in FIG. A device-side connector 60 is provided at the bottom of the battery storage case 76.

水平 The horizontal cross section of the battery storage case 76 has a rectangular shape like the battery pack 10. That is, the opening of the battery storage case 76 has the

long sides

77a, 77b approximately the same length as the

long sides

70a, 70b of the battery pack 10, and the short side 79a approximately the same length as the

short sides

72a, 72b. , 79b. The device-side connector 60 is disposed at the center of the bottom wall of the battery storage case 76, which is determined in the same manner as described above.

The device-side connector 60 has a support base 78, one male positive terminal 80 supported by the support base 78, and two male

negative terminals

82a and 82b. Each of the male positive electrode terminal 80 and the male

negative electrode terminals

82a and 82b has a substantially flat plate shape. The male positive terminal 80 has a larger area than the male

negative terminals

82a and 82b. The male positive electrode terminal 80 and the male

negative electrode terminals

82a and 82b are good conductors made of a metal such as copper as described above.

位置 The position of the male positive terminal 80 corresponds to the position of the female positive terminal 66, and the position of the male

negative terminals

82a, 82b corresponds to the positions of the female

negative terminals

68a, 68b. That is, the male

negative terminals

82a and 82b are in a positional relationship of making the male positive terminal 80 line-symmetric or rotationally symmetric, and therefore, the male negative terminal 82a, the male positive terminal 80, and the male negative terminal 82b are the same. Align on a straight line. The distance from the male negative terminal 82a to the male positive terminal 80 and the distance from the male negative terminal 82b to the male positive terminal 80 are the same.

位置決め From the upper surface of the support base 78, positioning pins 84a and 84b extending toward the battery-side connector 22 are provided upright. That is, the positioning pins 84a and 84b sandwich the male negative terminal 82a, the male positive terminal 80, and the male negative terminal 82b between each other. The distance from the positioning pin 84a to the male negative terminal 82a is the same as the distance from the positioning pin 84b to the male negative terminal 82b.

バッテリ The battery pack 10 according to the present embodiment is basically configured as described above, and its operation and effect will be described next.

The charged battery pack 10 is stored in, for example, the battery storage case 76 of the electric vehicle. At this time, the user grips the handle 24 and inserts the battery pack 10 from the upper opening of the battery storage case 76 into the hollow interior. Battery pack 10 is moved to the bottom along battery storage case 76.

(6) When the user inserts the battery pack 10 into the battery storage case 76 in the correct orientation, the female positive terminal 66 faces the male positive terminal 80 as shown in FIG. At the same time, the female negative terminal 68a faces the male negative terminal 82a, and the female negative terminal 68b faces the male negative terminal 82b. The positioning pin 84a faces the guide hole 74a, and the positioning pin 84b faces the guide hole 74b. When the battery pack 10 is further moved below the battery storage case 76, the positioning pins 84a and 84b start to enter the guide holes 74a and 74b. Thereafter, the positioning pins 84a and 84b are guided by the guide holes 74a and 74b, so that the alignment between the device-side connector 60 and the battery-side connector 22 is performed. When the positioning pins 84a and 84b are inserted to the predetermined depths of the guide holes 74a and 74b, the battery pack 10 is positioned and fixed at a predetermined position in the battery case 76.

At the same time when the positioning pins 84a, 84b are guided by the

guide holes

74a, 74b, the male positive terminal 80 is inserted into the female positive terminal 66, and the male

negative terminals

82a, 82b are inserted into the female

negative terminals

68a, 68b. , The engagement state shown in FIG. The female positive electrode terminal 66 and the female

negative electrode terminals

68a and 68b slightly open at the time of insertion, and then attempt to return to the original degree of opening by elastic action. By this elastic action, the male positive terminal 80 and the male

negative terminals

82a and 82b are sandwiched between the female positive terminal 66 and the female

negative terminals

68a and 68b.

That is, the battery-side connector 22 and the device-side connector 60 are electrically connected, and it becomes possible to supply electric power from each single cell 30 to the electric vehicle. When the electric vehicle is started and the operation is started, discharge is performed from the single cell 30. Note that information communication between the BMU 50 and the electric vehicle, for example, regarding the remaining capacity of the battery pack 10 and the like is performed via wireless communication.

個数 The number of male positive terminals 80 and female positive terminals 66 is one each, and the number of male

negative terminals

82a, 82b and female

negative terminals

68a, 68b is two each. Therefore, as described above, the area of the male positive terminal 80 is set to be larger than each of the male

negative terminals

82a and 82b, and the area of the female positive terminal 66 is set to each of the female

negative terminals

68a and 68b. Even in the case of being set relatively large, the contact resistance between the male positive terminal 80 and the female positive terminal 66 and the total contact resistance between the male

negative terminals

82a and 82b and the female

negative terminals

68a and 68b. Can be made substantially equivalent.

That is, the area of the electrode terminals with a large number can be made smaller than the area of the electrode terminals with a small number. The electrode terminals having a large number can be reduced in size, so that the battery-side connector 22 and the device-side connector 60 can be downsized.

By the way, it is assumed that the user inserts the battery pack 10 into the battery storage case 76 after turning the battery pack 10 by 180 °. Also in this case, the male positive terminal 80 faces the female positive terminal 66 as shown in FIG. As described above, the male positive terminal 80 is provided at the center of the bottom wall of the battery case 76, and the female positive terminal 66 is provided at the center of the bottom surface of the bottom case 18 of the battery pack 10. Because it is. Therefore, even if the direction of the battery pack 10 is 180 ° opposite to the normal direction, the male positive terminal 80 is located at the center of the bottom wall of the battery storage case 76 and the female positive terminal 66 is connected to the bottom case. This is because it is located at the center of the bottom surface of No. 18.

The male

negative electrode terminals

82a and 82b are arranged with the male positive electrode terminal 80 as the center of line symmetry (or rotational symmetry). The same applies to the positioning pins 84a and 84b. Accordingly, in this case, the female negative terminal 68b faces the male negative terminal 82a, and the female negative terminal 68a faces the male negative terminal 82b. The positioning pin 84a faces the guide hole 74b, and the positioning pin 84b faces the guide hole 74a. When the battery pack 10 is moved below the battery storage case 76 in this state, the positioning pins 84a, 84b enter the guide holes 74b, 74a. That is, the positioning pins 84a, 84b are guided by the guide holes 74b, 74a, and the positioning of the device-side connector 60 and the battery-side connector 22 is performed. Then, as shown in FIG. 9, as the positioning pins 84a and 84b are inserted to the predetermined depths of the guide holes 74b and 74a, the battery pack 10 is positioned and fixed at a predetermined position in the battery storage case 76.

At the same time, the male positive terminal 80 is inserted into the female positive terminal 66 and pinched, and the male

negative terminals

82a and 82b are inserted into the female

negative terminals

68b and 68a and pinched. As described above, even when the direction of the rotation direction of the battery pack 10 about the longitudinal axis as the center of rotation is reversed by 180 °, the battery-side connector 22 and the device-side connector 60 are engaged with each other to provide an electrical connection. And electric power can be supplied to the electric vehicle from each single cell 30. Thereafter, similarly to the above, when the electric vehicle is started and operation is started, discharge is performed from the single cell 30.

The battery-side connector 22 is provided on the bottom surface of the bottom case 18. For this reason, when the user checks the orientation of the battery pack 10 (battery-side connector 22), the user must grip the handle 24 and twist the wrist so that the bottom surface can be viewed. The larger the is, the greater the burden of twisting the wrist. In the first place, such a checking operation itself is complicated.

On the other hand, since the male positive terminal 80, the female positive terminal 66, the male

negative terminals

82a and 82b, and the female

negative terminals

68a and 68b are located at the above positions, the orientation of the battery pack 10 is changed from the normal direction. Even when the battery pack 10 is turned 180 degrees, the battery pack 10 and the electric vehicle can be electrically connected in the same manner as when the battery pack 10 is turned in the normal direction. This eliminates the need for a confirmation operation, thereby reducing the burden on the user. Further, convenience is improved.

底面 The bottom surface of the bottom case 18 has a rectangular shape. Therefore, when the direction of the battery pack 10 is rotated by 90 ° from the normal direction, the

long sides

70a, 70b interfere with the

short sides

79a, 79b of the opening of the battery storage case 76. Therefore, the battery pack 10 is prevented from being inserted into the battery storage case 76.

(4) When the remaining capacity of the single cell 30 of the battery pack 10 decreases and charging becomes necessary, the user holds the handle 24 and detaches the battery pack 10 from the battery storage case 76. The user further transports the battery pack 10 to the charging device, and electrically connects the battery-side connector 22 to the charging connector of the charging device. The charging connector is configured similarly to the device-side connector 60. For this reason, in any case where the battery pack 10 is in the normal direction and when the battery pack 10 is turned 180 ° from the normal direction, the single cell 30 is charged.

The present invention is not particularly limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention.

For example, an electrode terminal (first terminal of the first polarity) located at the center of each of the battery-side connector 22 and the device-side connector 60 is used as a negative electrode terminal, and two electrode terminals (second-polarity terminals) provided on both sides thereof The second terminal) may be a positive terminal.

The battery-side connector 22 may be a male connector, and the device-side connector 60 and the charging connector may be female connectors. In this case, it is preferable to set the male terminal of the battery-side connector 22 to a length that does not protrude from the bottom case 18.

DESCRIPTION OF SYMBOLS 10 ... Battery pack 12 ...

Cases

14, 16 ... Battery core pack 17 ... Case main body 18 ... Bottom case 21 ... Window part 22 ... Battery side connector 30 ...

Single cell

32, 36 ... Cell holder 34 ... Cell accommodation hole 37 ... Housing hole row 38 ...

bus bar

44, 46 ... inner room 50 ... BMU
60 device side connectors 64a to 64c terminal receiving holes 66 female

positive terminal

68a, 68b female

negative terminal

70a, 70b

long side

72a, 72b

short side

74a, 74b guide hole 76

battery storage case

77a , 77b ...

long side

79a, 79b ... short side 80 ... male

positive terminal

82a, 82b ... male

negative terminal

84a, 84b ... positioning pin L1, L2 ... bisector

Claims

A case (12) accommodating a battery core pack (14, 16) having a plurality of single cells (30), and a conduction connector (22) electrically connected to the single cells on a bottom surface of the case. ) Provided with a battery pack,
The conduction connector has one first terminal (66) indicating a first polarity and two second terminals (68a, 68b) indicating a second polarity.
The battery pack, wherein the first terminal is located at a central portion of the bottom surface, and the two second terminals are disposed with the first terminal as a line symmetry center.
The battery pack according to claim 1, wherein the bottom surface is rectangular in plan view.
The battery pack according to claim 1, wherein the area of the first terminal is larger than the area of the second terminal.
(4) The battery pack according to any one of (1) to (3), wherein the conduction connector is a female connector.
(5) The battery pack according to any one of (1) to (4), wherein a window (21) is formed on the bottom surface of the case, and the conduction connector faces the window.