JP2015118792A - Secondary battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a configuration capable of discharging internal energy when pressure is applied from the outside.SOLUTION: A secondary battery module comprises: first and second single batteries 10, 20 having positive and negative electrodes; a bus bar 110 connected to the positive electrode 11 of the first single battery 10; and a bus bar 120 connected to the negative electrode 22 of the second single battery 20. The first and second conductive members 110, 120 are arranged so as to be opposite to each other. The bus bar 110 includes a first extension part 111 extending to the side face of the first single battery 10 so that the bus bar 110 and the second single battery 20 face each other; the bus bar 120 includes a second extension part 121 extending so that the bus bar 120 and the first single battery 10 face each other. When pressure applied from the outside makes the first single battery 10 be close to the second single battery 20, the first extension part 111 becomes in contact with the second extension part 121.

Description

  The present invention relates to a secondary battery module, and more particularly to a secondary battery module having a plurality of single cells.

  Conventionally, secondary battery modules are disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-242957 (Patent Document 1), Japanese Patent Application Laid-Open No. 2005-322647 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2013-3301 (Patent Document 3). ing.

Japanese Patent Laid-Open No. 2003-242956 JP 2005-322647 A JP 2013-3301 A

  Patent Document 1 discloses a battery module in which 10 battery cells provided with a positive electrode terminal and a negative electrode terminal are arranged such that adjacent terminals are alternately positive and negative. With this configuration, there is a problem that the battery cell is deformed while energy remains in the battery when pressure is applied from the outside.

  In view of the above, the present invention has been made to solve the above-described problem, and provides a secondary battery module capable of releasing energy in a single cell when pressure is applied from the outside. It is the purpose.

  The secondary battery module according to the present invention has a positive electrode and a negative electrode, and is connected to one of the first and second unit cells in which the positive electrode and the negative electrode are alternately arranged, and one of the positive electrode and the negative electrode of the first cell. A first conductive member and a second conductive member connected to the other of the positive electrode and the negative electrode of the second unit cell, wherein the first and second conductive members are arranged to face each other, A first extension projecting from the side surface of the first cell so as to face the cell, and when the pressure is applied from the outside and the first cell approaches the second cell, the first extension is second Contact the conductive member.

  In the secondary battery module configured as described above, since the first extension portion contacts the second conducting member when pressure is applied from the outside and the first cell approaches the second cell, the first and first By electrically connecting two unit cells, it is possible to release the internal energy of these unit cells.

  In the secondary battery module configured as described above, the internal energy of the single cell can be released when pressure is applied from the outside.

1 is a perspective view of a secondary battery module having a plurality of unit cells according to Embodiment 1. FIG. FIG. 3 is a perspective view of a bus bar having a first extension portion according to the first embodiment. FIG. 3 is a front view of a secondary battery module having a plurality of unit cells according to the first embodiment. It is a front view of the secondary battery module in which pressure was applied from the outside and the bus bars contacted each other. 10 is a perspective view of a bus bar according to Comparative Example 1. FIG. FIG. 6 is a front view of a secondary battery module having a plurality of unit cells according to a second embodiment. FIG. 6 is a side view of a secondary battery module having a plurality of unit cells according to the second embodiment. FIG. 10 is a side view of a secondary battery module having a plurality of single cells according to Comparative Example 2. It is a perspective view of the secondary battery module which consists of a plurality of single cells.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a perspective view of a secondary battery module having a plurality of unit cells according to the first embodiment. FIG. 2 is a perspective view of a bus bar having a first extension according to the first embodiment. FIG. 3 is a front view of a secondary battery module having a plurality of unit cells according to the first embodiment. FIG. 4 is a front view of the secondary battery module in which pressure is applied from the outside and the bus bars are in contact with each other.

  Referring to FIGS. 1 to 3, the secondary battery module includes first and second unit cells 10, 20 having positive electrodes 11, 21 and negative electrodes 12, 22, and positive electrode 11 and negative electrode 12 of first unit cell 10. A bus bar 110 as a first conductive member connected to one of the two, and a bus bar 120 as a second conductive member connected to the other of the positive electrode 21 and the negative electrode 22 of the second unit cell 20. The conductive members 110 and 120 are arranged to face each other, and the bus bar 110 has a first extension portion 111 that extends to the side surface of the first unit cell 10 so as to face the second unit cell 20. When the first unit cell 10 comes close to the second unit cell 20 by applying pressure from the outside and having a second extension 121 extending to the side surface of the second unit cell 20 so as to face the unit cell 10. One extension 111 Contacting the second extension portion 121. The negative electrode 12 and the positive electrode 21 are connected by a third conductive member 130.

  The bus bar 110, the bus bar 120, and the third conductive member 130 are each constituted by a bus bar. The bus bar 110 is provided with through holes 113 and 114 for inserting terminals. The bus bar 110 has first extensions 111 and 112 at both ends.

  As indicated by arrows 19 and 29, when pressure is applied to the first cell 10 and the second cell 20 from the outside, the first extension 111 contacts the second extension 121. Thereby, the internal energy of the first and second unit cells 10 and 20 can be released.

  In the battery module, a plurality of single cells as battery cells having a square structure are connected. When the cell is crushed in a state having internal energy, it is short-circuited as shown in FIG. At least one location is provided with a conducting surface that can be a short circuit with an adjacent cell.

(Comparative Example 1)
FIG. 5 is a perspective view of the first conductive member according to Comparative Example 1. FIG. Referring to FIG. 5, through holes 121 and 122 are provided in bus bar 110, but no extension is provided. As a result, as shown in FIG. 4, it is difficult to short-circuit when pressure is applied from the outside.

(Embodiment 2)
FIG. 6 is a front view of a secondary battery module having a plurality of unit cells according to the second embodiment. FIG. 7 is a side view of a secondary battery module having a plurality of unit cells according to the second embodiment.

  With reference to FIGS. 6 and 7, in this embodiment, terminal 210 has a first extension 211 and terminal 220 has a second extension 221. A Z-shaped terminal 210 is disposed on the gasket 215, and an end portion of the terminal 210 forms a first extension portion 211.

(Comparative Example 2)
FIG. 8 is a side view of a secondary battery module having a plurality of unit cells according to Comparative Example 2. Referring to FIG. 8, in Comparative Example 2, the first extension portion is not provided at the end portion of the terminal. For this reason, it is difficult to short-circuit when pressure is applied from the outside.

(Embodiment 3)
In the third embodiment, it was investigated whether a single cell was moved in various directions to cause a short circuit. FIG. 9 is a perspective view of a secondary battery module including a plurality of single cells. The first to third unit cells 10, 20, 30 were connected by bus bars 110, 120, 130, 140. The shapes of the bus bars 110, 120, 130, and 140 are the same as those in the first embodiment or the first comparative example.

  The secondary battery module was crushed by applying pressure from the directions indicated by arrows 29 and 39. At this time, the cell (single cell) was moved in the thickness direction (A), the width direction (B), and the height direction (C) to examine whether a short circuit occurred. With respect to the secondary battery having the bus bar according to Embodiment 1 and the secondary battery having the bus bar according to Comparative Example 1, the cell moving directions (A) to (C) and the presence / absence of a short circuit were examined. As a result, in the secondary battery module having the bus bar according to the first embodiment, a short circuit occurs even when the battery moves in any of the thickness direction (A), the width direction (B), and the height direction (C). In contrast, the secondary battery module having the bus bar according to Comparative Example 1 was moved in any of the thickness direction (A), the width direction (B), and the height direction (C). No short circuit occurred.

  As described above, the embodiment shown here can be variously changed. The first extension portions 111 and 112 and the second extension portion 121 as conductive surfaces are covered with a resin or the like and are normally insulated. (1) The resin is melted by heat to expose the conductor. (2) The resin may be physically destroyed by compression or the like to expose the conductor.

  As the secondary battery module, not only a lithium secondary battery but also various secondary batteries using a conductive member can be used. Further, the secondary battery can be used for in-vehicle use, stationary use, portable use, and the like.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be used in the field of secondary battery modules having a plurality of single cells.

  DESCRIPTION OF SYMBOLS 1 Secondary battery, 30 Battery case, 100 Positive electrode, 101 Current collection terminal, 105 Current interruption mechanism, 111 Thin part, 120 Inversion board, 121 Pressure sensing surface, 130 Connection terminal, 140 Sealing board, 150 Insulation member, 160 Conductive member 501 through-hole 502 thin film portion 513 countersink.

Claims (1)

A first cell and a second cell having a positive electrode and a negative electrode, the positive electrode and the negative electrode being alternately arranged;
A first conductive member connected to one of a positive electrode and a negative electrode of the first unit cell;
A second conductive member connected to the other of the positive electrode and the negative electrode of the second unit cell,
The first and second conductive members are disposed opposite to each other;
The first conductive member has a first extension protruding from a side surface of the first unit cell so as to face the second unit cell,
The secondary battery module, wherein when the pressure is applied from the outside and the first unit cell approaches the second unit cell, the first extension portion contacts the second conductive member.

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