JP2015185373A - Wiring member for battery stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring member for a battery stack capable of simplifying the work for electrically connecting between battery cells.SOLUTION: A wiring member 1 for a battery stack connects between a battery stack 20 including a plurality of battery cells 21 provided so that positive terminals 211 and negative terminals 212 are arranged alternately, and voltage measurement means 30 for measuring an inter-terminal voltage of each of the plurality of battery cells 21. The wiring member 1 has a battery side terminal part 11 connected with both the positive terminal 211 and the negative terminal 212 adjacent to it, and electrically connecting between both terminals.

Description

  The present invention relates to a wiring member for a battery stack composed of a plurality of battery cells.

  For example, as described in Patent Document 1 below, a plurality of battery cells constituting a battery stack are electrically connected to each other by connection parts called bus bars or the like.

JP 2013-235754 A

  As described in Patent Document 1, the operation of electrically connecting battery cells with a bus bar or the like is complicated and increases the production cost.

  Problem to be solved by the invention is providing the wiring member for battery stacks which can simplify the operation | work which electrically connects battery cells.

  In order to solve the above problems, a wiring member for a battery stack according to the present invention includes a battery stack including a plurality of battery cells provided so that positive terminals and negative terminals are alternately arranged, and terminals of each of the plurality of battery cells. A wiring member for connecting the voltage measuring means for measuring the voltage between the positive terminal and the negative terminal adjacent to the positive terminal, and having a battery side terminal portion for electrically connecting both terminals. Features.

  A measuring means side terminal portion connected to the voltage measuring means, and a relay portion interposed between the battery side terminal portion and the measuring means side terminal portion, the relay portion being displaceable three-dimensionally It is preferable to include a simple displacement absorbing portion.

  The battery-side terminal portion of the battery stack wiring member according to the present invention is connected to both the positive terminal and the negative terminal adjacent thereto in the battery stack. That is, the battery stack wiring member not only serves to electrically connect each battery cell and the voltage measuring means in order to measure the voltage between the terminals of the battery cells, but also electrically connects adjacent battery cells. Also serves as a connecting part (bus bar). Therefore, the work | work only for electrically connecting battery cells becomes unnecessary. Moreover, the connection components used only for electrically connecting the battery cells are not necessary.

  Since the battery-side terminal portion of the battery stack wiring member is connected to the two terminals, the battery cells may be misaligned if the relative positions of the battery cells (the relative positions of the plus terminal and the minus terminal) are shifted. There is a possibility that the operation of connecting the side terminal portion to the two terminals becomes difficult. On the other hand, if the battery stack wiring member has a displacement absorbing portion that can be displaced three-dimensionally, the battery-side terminal can be obtained by displacing the displacement absorbing portion even if some displacement occurs. Since the portion can be positioned at a position connectable to the two terminals, the work of connecting the battery side terminal portion and the two terminals is facilitated.

It is an external view of the wiring member for battery stacks concerning one Embodiment of this invention. FIG. 2 is a plan view of a battery unit in which the battery stack wiring member shown in FIG. 1 is used (a battery stack and a voltage measuring means connected by the battery stack wiring member). It is the figure which showed typically the cross section of the battery unit (what the battery stack and the voltage measurement means were connected by the battery stack wiring member) using the battery stack wiring member shown in FIG. It is an external view of the wiring member for battery stacks concerning another embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the vertical direction refers to the vertical direction in FIG. 3, the width direction (horizontal direction) refers to the horizontal direction in FIG. 3, and the longitudinal direction refers to a direction perpendicular to the vertical direction and the width direction. And These directions do not limit the installation direction of the battery stack 20. The battery stack wiring member 1 according to one embodiment of the present invention shown in FIG. 1 is a member for electrically connecting the battery stack 20 and the voltage measuring means 30.

  The battery stack 20 shown in FIGS. 2 and 3 is configured by arranging a plurality of battery cells 21 having terminals 210 provided on the upper surface. Specifically, the battery cells 21 are arranged so that the positive terminals 211 and the negative terminals 212 are alternately arranged on one side and the other side in the width direction of the battery stack 20. Each terminal 210 in the present embodiment is a shaft-like portion that protrudes from the upper surface of the battery, and a male screw is formed around it.

  Each battery cell 21 (excluding the terminal 210) has a rectangular parallelepiped shape. The battery stack 20 is arranged so that the plurality of battery cells 21 form a substantially rectangular parallelepiped shape. The surface (upper surface) where the terminal 210 in the battery stack 20 is located is substantially rectangular, and the terminal 210 is located on one side and the other side in the width direction. When the battery stack 20 is viewed from above (when the battery stack 20 is viewed from above), the width is set so as to be point-symmetric with respect to the center (intersection connecting diagonal lines) of the surface (upper surface) on which the substantially rectangular terminal 210 is located. Plus terminals and minus terminals are alternately arranged on one side and the other side in the direction.

  The voltage measuring means 30 shown in FIG. 2 and FIG. 3 measures the inter-terminal voltage of each of the plurality of battery cells 21. The voltage measuring means 30 in the present embodiment is a circuit built on a substrate. Lands 31 that are part of the conductive patterns constituting the circuit are formed on the substrate (not shown except for the land portions 31 in FIG. 2). One end of the plurality of wiring members including the battery stack wiring member 1 (measurement means side terminal portion 12 described later) is connected to the land portion 31. A plurality of land portions 31 are formed on both sides in the width direction of the substrate so as to be aligned along the longitudinal direction (the parallel direction of the battery cells 21). The voltage measurement means 30 (substrate) fixing structure is not limited to a specific structure, and a detailed description thereof will be omitted. As shown in FIG. 3 and the like, the voltage measuring unit 30 may be fixed to the battery stack 20 (the structure in which the voltage measuring unit 30 is fixed to the support portion 22 fixed to the battery stack 20). The voltage measuring means 30 may be fixed to another member (such as a housing) that is not used.

  The wiring member is a member for connecting the voltage measuring means 30 and the terminal 210 of the battery cell 21 constituting the battery stack 20. That is, a plurality of wiring members are used so that the voltage between the terminals of each battery cell 21 can be measured. Among the plurality of wiring members, a wiring member connecting the positive terminal 211 of the battery cell 21 located at one end of the battery stack 20 and the voltage measuring means 30, and a minus terminal of the battery cell 21 located at the other end. Except for the wiring member connecting 212 and the voltage measuring means 30, it has the following shape (the wiring member described below corresponds to the battery stack wiring member 1 according to one embodiment of the present invention).

  The battery stack wiring member 1 includes a relay portion 10, a battery side terminal portion 11 and a measuring means side terminal portion 12 provided at both ends thereof. That is, it has a structure in which both terminal portions are connected via the relay portion 10. The battery side terminal portion 11 is a plate-like member formed of a hard conductive material, and is adjacent to the positive terminal 211 of one battery cell 21 constituting the battery stack 20 and the one battery cell 21. This is a terminal that can be connected to both the negative terminal 212 of the battery cell 21. In the present embodiment, two through holes 111 corresponding to the distance between the two terminals 210 are formed in the battery-side terminal portion 11 so as to be connectable to both the plus terminal 211 and the minus terminal 212 adjacent thereto. Specifically, the distance between the centers of the two through holes 111 is formed so as to coincide with the distance between the central axes of both terminals 210. Each through hole 111 has a size that allows each terminal 210 to be inserted therethrough. In the present embodiment, after the terminal 210 is inserted into each through hole 111, the battery-side terminal portion 11 is connected to the two terminals 210 by screwing a nut into a male screw formed in the terminal 210.

  The battery side terminal part 11 is provided at one end of the relay part 10. The relay part 10 in this embodiment is an electric wire, and the battery side terminal part 11 is fixed to one end of the electric wire (core wire of the electric wire). At the other end of the relay unit 10, a measuring means side terminal unit 12 is provided. The measuring means side terminal portion 12 is a terminal connected to the voltage measuring means 30 (each land portion 31 formed on the substrate). The shape may be anything. It is good also as a structure which the core wire of an electric wire becomes the measurement means side terminal part 12 (The core wire of an electric wire is directly connected to the voltage measurement means 30).

  Since the relay part 10 in this embodiment is an electric wire, it can be easily displaced (deforms) itself. In other words, if the relay portion 10 is an electric wire having a length with respect to the distance between each terminal 210 of the battery cell 21 and the voltage measuring means 30 (each land portion 31 formed on the substrate), the electric wire can be any A certain amount of displacement in the direction is possible (three-dimensional displacement is possible).

  The battery stack 20 and the voltage measuring means 30 are connected using such a battery stack wiring member 1. Specifically, the battery side terminal portion 11 of the battery stack wiring member 1 is connected to both a certain positive terminal 211 and a negative terminal 212 adjacent thereto. When viewed in the longitudinal direction, the battery-side terminal portions 11 of the battery stack wiring members 1 are connected alternately on the one side and the other side in the width direction. That is, the positive terminal 211 of a certain battery cell 21 and the negative terminal 212 of another battery cell 21 adjacent thereto are connected to the battery side terminal portion 11 of the battery stack wiring member 1, and the positive terminal of the other battery cell 21 is connected. 211 and a negative terminal 212 of another battery cell 21 adjacent thereto are connected to the battery-side terminal portion 11 of another battery stack wiring member 1.

  By connecting the battery stack wiring member 1 in this manner, the battery cells 21 are connected in series. That is, the battery cells 21 are electrically connected to each other by the battery side terminal portion 11 of each battery stack wiring member 1. Thus, the battery side terminal part 11 functions not only for detecting the potential of the terminal of each battery cell 21 but also as a so-called bus bar.

  As described above, in the present embodiment, the battery stack wiring member 1 used for measuring the inter-terminal voltage of each battery cell 21 constituting the battery stack 20 is connected to each battery cell 21 in series. It is also used as a member. In addition, since the potential of a certain positive terminal 211 and the negative terminal 212 adjacent thereto is the same, the battery side terminal portion 11 may be connected to both the positive terminal 211 and the negative terminal 212 adjacent thereto. There is no problem with voltage measurement.

  The positive terminal 211 of the battery cell 21 located at one end of the battery stack 20 and the minus terminal 212 of the battery cell 21 located at the other end of the battery stack 21 are connected in series. Since it is the terminal 210 of both ends, it is not necessary to use the wiring member 1 for battery stacks concerning this embodiment. That is, a simple wiring member that connects the terminal 210 of the battery cell 21 and the voltage measuring means 30 (the corresponding land portion 31 of the substrate) may be used. In this way, the battery unit 1u in which the battery stack 20 and the voltage measuring means 30 are connected by the battery stack wiring member 1 is obtained.

  As described above, according to the battery stack wiring member 1 according to the present embodiment, the battery side terminal portion 11 is connected to both the plus terminal 211 and the minus terminal 212 adjacent thereto in the battery stack 20. That is, the battery stack wiring member 1 not only serves to electrically connect each battery cell 21 and the voltage measuring means 30 in order to measure the voltage between the terminals of the battery cell 21, but also between adjacent battery cells 21. Also serves as a connecting part (bus bar) for electrical connection. Therefore, the work | work only for electrically connecting battery cells 21 mutually becomes unnecessary. Moreover, the connection components (only having a bus bar function) used only for electrically connecting the battery cells 21 are not required.

  Further, since the battery side terminal portion 11 of the battery stack wiring member 1 is connected to the two terminals 210, the relative positions of the battery cells 21 (the relative positions of the plus terminal 211 and the minus terminal 212). ) May be difficult to connect the battery side terminal portion 11 to the two terminals 210. On the other hand, the battery stack wiring member 1 according to the present embodiment has a configuration in which the relay unit 10 constituted by electric wires can be displaced three-dimensionally (the relay unit 10 constituted by electric wires itself is a displacement absorbing unit. 101), the battery-side terminal portion 11 is positioned at a position where it can be connected to the two terminals 210 by displacing the displacement absorbing portion 101 constituted by the electric wires, even if there is a slight displacement. Therefore, the operation of connecting the battery side terminal portion 11 and the two terminals 210 is facilitated.

  Examples of the configuration of the relay portion (displacement absorbing portion) different from the relay portion 10 (displacement absorbing portion 101) of the battery stack wiring member 1 according to the embodiment include the following configurations. In the battery stack wiring member 1a shown in FIG. 4, the relay part 10a is formed of a linear conductive material, and a part of the relay part 10a is a coil spring. Such a coil spring portion becomes the displacement absorbing portion 101a. That is, the coil spring portion can be displaced in the vertical direction by expanding and contracting. In addition, the coil spring portion can be displaced in a direction intersecting with the vertical direction. Thus, the coil spring part which is the displacement absorption part 101a can be displaced three-dimensionally.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

1 (1a) Battery stack wiring member 10 (10a) Relay part 101 (101a) Displacement absorbing part 11 Battery side terminal part 12 Measuring means side terminal part 20 Battery stack 21 Battery cell 210 Terminal 211 Positive terminal 212 Negative terminal 30 Voltage measurement Means (substrate)

Claims (2)

A wiring member that connects a battery stack including a plurality of battery cells provided so that a plus terminal and a minus terminal are alternately arranged, and a voltage measuring unit that measures a voltage between terminals of each of the plurality of battery cells,
A battery stack wiring member connected to both the positive terminal and the negative terminal adjacent thereto, and having a battery side terminal portion for electrically connecting both terminals. A measuring means side terminal portion connected to the voltage measuring means, and a relay portion interposed between the battery side terminal portion and the measuring means side terminal portion,
The battery stack wiring member according to claim 1, wherein the relay portion includes a displacement absorbing portion that can be displaced three-dimensionally.

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