JP2019096540A - Method of manufacturing battery - Google Patents

Abstract

To provide a method of manufacturing a battery, allowing for suppression of a resonance phenomenon of a battery pack when vibration is transmitted to the battery from an outside.SOLUTION: The method of manufacturing a battery comprises the steps of: stacking a plurality of single cells 12 and arranging a pair of wedge members 21 on both sides of the stacked single cells 12; and arranging an assembled battery 18 and the pair of wedge members 21 in a battery case 31 while applying a compressive force from both sides of the pair of wedge members 21 so that the assembled battery 18 deforms in a convex shape toward a bottom 32.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a method of manufacturing a battery.

  For example, the battery pack disclosed in Japanese Patent Laid-Open No. 2009-231126 (Patent Document 1) has a plurality of battery modules arranged to align in a straight line, and a housing for housing the plurality of battery modules.

  Also, various batteries are disclosed in Japanese Patent Application Laid-Open Nos. 61-216238 (Patent Document 2), 2014-127530 (Patent Document 3), and 2004-55446 (Patent Document 4). ing.

JP, 2009-231126, A Japanese Patent Application Laid-Open No. 61-216238 JP, 2014-127530, A JP 2004-55446 A

  As disclosed in Patent Document 1 described above, a battery is known that includes a battery assembly including a plurality of single batteries stacked in one direction, and a battery case for housing the battery assembly. In such a battery, when vibration is transmitted to the battery from the outside, there is a possibility that the assembled battery may cause a resonance phenomenon in the battery case.

  Therefore, an object of the present disclosure is to solve the above-described problems, and to provide a method of manufacturing a battery capable of suppressing the resonance phenomenon of the assembled battery when vibration is transmitted to the battery from the outside. .

  The present disclosure relates to a method of manufacturing a battery. The battery has an assembled battery formed by stacking a plurality of single cells in one direction, a bottom contacting with the assembled battery, and a pair of side walls rising from the bottom and facing each other in the stacking direction of the single batteries. A battery case for containing a battery, each of a pair of side wall portions, and a pair of wedge members interposed between the battery assembly. The wedge member is in contact with the battery assembly and has an inclined contact surface which is inclined such that the distance from the side wall increases with distance from the bottom. The method of manufacturing the battery includes the steps of stacking a plurality of single cells and arranging a pair of wedge members on both sides of the stacked plurality of single cells so that the assembled battery deforms in a convex shape toward the bottom. And disposing the assembled battery and the pair of wedge members in the battery case while applying a compressive force from both sides of the pair of wedge members.

  According to the battery manufacturing method configured as described above, when arranging the assembled battery and the pair of collar members in the battery case by arranging the pair of collar members on both sides of the plurality of stacked unit cells, When a compressive force is applied from both sides of the pair of wedge members, the assembled battery deforms in a convex shape toward the bottom. In this case, the load generated when the battery pack abuts on the bottom and the convex shape of the battery pack is corrected can be provided as an initial load on the bottom from the battery pack housed in the battery case. As a result, even when vibration is transmitted to the battery from the outside, the deformation of the assembled battery is suppressed by the initial load, so that the resonance phenomenon of the assembled battery can be suppressed.

  As described above, according to the present disclosure, it is possible to provide a method of manufacturing a battery capable of suppressing the resonance phenomenon of the assembled battery when vibration is transmitted to the battery from the outside.

It is sectional drawing which shows the battery manufactured using the manufacturing method of the battery in embodiment of this indication. It is an exploded view showing the battery in FIG. It is a sectional view showing the 1st process of a manufacturing method of a battery in the present disclosure. It is sectional drawing which shows the 2nd process of the manufacturing method of the battery in this indication. It is sectional drawing which shows the 3rd process of the manufacturing method of the battery in this indication.

  Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

  FIG. 1 is a cross-sectional view showing a battery manufactured using the battery manufacturing method according to the embodiment of the present disclosure. FIG. 2 is an exploded view showing the battery in FIG. First, the structure of a battery 10 manufactured using the battery manufacturing method according to the embodiment of the present disclosure will be described with reference to FIGS. 1 and 2.

  The battery 10 is for driving a vehicle, and for example, a hybrid vehicle having an internal combustion engine such as a gasoline engine or a diesel engine and a motor powered by a chargeable / dischargeable battery as a motive power source, or a plug capable of external charging Installed in in-hybrid vehicles, electric vehicles, etc.

  The battery 10 has a battery assembly 18, a battery case 31, and a pair of wedge members 21 (21p, 21q).

  The battery assembly 18 has a plurality of single cells 12 and a spacer 14. The unit cell 12 is a lithium ion battery. The unit cell 12 has a flat rectangular parallelepiped shape.

  The plurality of unit cells 12 are stacked in one direction (hereinafter, also referred to as “stacking direction of unit cells 12”) indicated by an arrow 101 in FIG. The direction in which the shortest side of the three sides of the unit cells 12 orthogonal to each other extends (the thickness direction of the unit cells 12) is parallel to the stacking direction of the unit cells 12. The plurality of single cells 12 are electrically connected in series.

  The spacers 14 are interposed between the adjacent single cells 12 placed in the stacking direction. The spacer 14 is made of an insulating material. The spacer 14 has a function of electrically insulating between the adjacent single cells 12.

  The battery assembly 18 has a rectangular parallelepiped shape as a whole. The direction in which the longest side of the three sides of the assembled battery 18 orthogonal to each other extends is parallel to the stacking direction of the unit cells 12. The battery assembly 18 has a top surface 18m and a bottom surface 18n. The bottom surface 18 n is a plane including the stacking direction of the unit cells 12. The top surface 18m is disposed on the back side of the bottom surface 18n. The bottom surface 18 n faces downward in the direction of gravity. The top surface 18m faces upward in the direction of gravity. The battery assembly 18 is housed in a battery case 31.

  The battery case 31 has a rectangular parallelepiped shape whose one surface is open as a whole. Battery case 31 has a bottom 32 and a pair of side walls 33 (33p, 33q) as its component parts.

  The bottom 32 is the bottom of the battery case 31. The battery case 31 is open at a position facing the bottom 32. The pair of side wall portions 33 constitutes a side wall of the battery case 31. The pair of side wall portions 33 rise from the bottom portion 32 and face each other in the stacking direction of the unit cells 12. The pair of side wall portions 33 are arranged in parallel to each other. The pair of side wall portions 33 has a wall shape orthogonal to the stacking direction of the single cells 12.

  A cell 12 p is disposed at one end of the battery assembly 18 in the stacking direction of the cells 12. The side wall 33p is opposed to the unit cell 12p via a weir member 21p described later. A single battery 12 q is disposed at the other end of the battery assembly 18 in the stacking direction of the single batteries 12. The side wall portion 33 q is opposed to the unit cell 12 q via a weir member 21 q described later.

  The battery assembly 18 is provided on the bottom 32. The bottom portion 32 is in contact with the battery assembly 18 (bottom surface 18 n). The bottom 32 is in flat contact with the battery assembly 18 (bottom surface 18 n).

  The pair of wedge members 21 is interposed between each of the pair of side wall portions 33 and the assembled battery 18. The weir member 21p is interposed between the side wall 33p and the battery assembly 18 (cell 12p). The wedge member 21 q is interposed between the side wall 33 q and the battery assembly 18 (cell 12 q).

  The wedge member 21 is made of an insulating material. The wedge member 21 has a function of electrically insulating between the unit cell 12 and the battery case 31 (side wall portion 33).

  The wedge member 21 has an abutting surface 24 and a side surface 26 as its component parts. The abutment surface 24 intersects the side surface 26 at an acute angle. The contact surface 24 is in contact with the battery assembly 18. The side surface 26 is in contact with the side wall portion 33. The contact surface 24 of the wedge member 21p is in contact with the unit cell 12p. The side surface 26 of the wedge member 21p is in contact with the side wall 33p. The contact surface 24 of the wedge member 21 q is in contact with the unit cell 12 q. The side surface 26 of the wedge member 21 q is in contact with the side wall portion 33 q.

  The abutment surface 24 is inclined such that the distance from the side wall 33 increases with distance from the bottom 32. The contact surface 24 is disposed obliquely to the side wall 33. The corner of the wedge member 21 formed by the contact surface 24 and the side surface 26 faces the bottom 32. The corner of the wedge member 21 formed by the contact surface 24 and the side surface 26 is disposed at the corner between the bottom 32 and the side wall 33.

  Then, the process of manufacturing the battery 10 in FIG. 1 is demonstrated using the manufacturing method of the battery in this indication.

  3 to 5 are cross-sectional views showing steps of a method of manufacturing a battery in the present disclosure. Referring to FIG. 3, first, the plurality of single cells 12 are stacked, and a pair of wedge members 21 is disposed on both sides of the plurality of stacked single cells 12.

  More specifically, the battery pack 18 is obtained by stacking the plurality of single cells 12 in one direction while arranging the spacers 14 between the adjacent single cells 12. While making the contact surface 24 face the unit cell 12p, the wedge member 21p is superimposed on the unit cell 12p from the stacking direction of the unit cell 12. While making the contact surface 24 face the unit cell 12q, the wedge member 21q is superimposed on the unit cell 12q from the stacking direction of the unit cell 12.

  With reference to FIGS. 4 and 5, next, battery pack 18 and the pair are applied while applying a compressive force from both sides of the pair of wedge members 21 so that battery pack 18 is deformed in a convex shape toward bottom 32. The wedge member 21 is disposed in the battery case 31.

  More specifically, a compressive force is applied along the stacking direction of the unit cells 12 from both sides of the wedge member 21p and the wedge member 21q. At this time, since a downward force acts on the battery assembly 18 in FIG. 4, the battery assembly 18 has the wedge member 21p and the scissors such that the bottom surface 18n is convex and the top surface 18m is concave. It is deformed into an arc (elastically deformed) between the members 21 q.

  With compressive force applied from both sides of the wedge member 21p and the wedge member 21q, the length between the side surface 26 of the wedge member 21p and the side surface 26 of the wedge member 21q is between the sidewall 33p and the sidewall 33q Smaller than the size of the

  The battery case 31 is installed so that the opening surface thereof is directed upward in the direction of gravity. The assembled battery 18 and the pair of wedge members 21 are disposed in the battery case 31 in a state where the assembled battery 18 is deformed in a convex shape toward the bottom portion 32. With the assembled battery 18 deformed downward in the direction of gravity, the assembled battery 18 and the pair of wedge members 21 are disposed in the battery case 31. While pressing the bottom surface 18n of the battery assembly 18 toward the bottom 32, the action of the compressive force on the wedge members 21p and 21q is eliminated.

  Then, the effect produced by the manufacturing method of the battery in the present disclosure will be described.

  In the unit cell which is a square lithium ion battery, in order to fully exhibit the performance, it is necessary to make constant load always act. Therefore, by arranging the assembled battery in the battery case while compressively deforming the assembled battery, it is possible to obtain a load due to the spring force of the assembled battery itself.

  On the other hand, in a battery mounted on a vehicle, vibration of the vehicle is transmitted to the battery. In this case, the battery pack may be deformed in a convex shape (upward in FIG. 5) on the opposite side to the bottom of the battery case to amplify the vibration, which may cause a resonance phenomenon.

  On the other hand, in the battery manufacturing method according to the present disclosure, when arranging the assembled battery 18 and the pair of weir members 21 in the battery case 31 by arranging the pair of weir members 21 on both sides of the assembled battery 18. When a compressive force is applied from both sides of the pair of wedge members 21, the battery assembly 18 is deformed in a convex shape toward the bottom portion 32. In this case, the load generated when the assembled battery 18 abuts on the bottom 32 and the convex shape of the assembled battery 18 is corrected can be provided as an initial load that causes the assembled battery 18 to press the bottom 32 downward. By generating such an initial load, it is possible to suppress the deformation of the assembled battery 18 and to suppress the occurrence of the resonance phenomenon even when the vibration of the vehicle is transmitted to the battery 10.

  In this case, since the acceleration resistance performance required for various parts attached to the battery assembly 18 and the battery assembly 18 itself is lowered, the number of components can be reduced, and thus, the manufacturing cost can be reduced and the weight can be reduced. Can.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

  The present disclosure is applied to, for example, a method of manufacturing a battery mounted on a vehicle.

  DESCRIPTION OF SYMBOLS 10 battery 12, 12p, 12q single cell, 14 spacer, 18 assembled battery, 18m top surface, 18n bottom surface, 21, 21p, 21q base member, 24 contact surface, 26 side surface, 31 battery case, 32 bottom part 33, 33p, 33q Sidewalls.

Claims (1)

A method of manufacturing a battery,
The battery is
An assembled battery having a plurality of single cells stacked in one direction;
A battery case having a bottom contacting with the assembled battery and a pair of side walls rising from the bottom and facing each other in the stacking direction of the unit cells, the battery case accommodating the assembled battery;
And a pair of wedge members interposed between the pair of side wall portions and the assembled battery;
The wedge member has an abutting surface that abuts on the battery assembly and is inclined such that the distance from the side wall increases with distance from the bottom.
The method of manufacturing the battery is
Stacking the plurality of unit cells and arranging a pair of the wedge members on both sides of the plurality of stacked unit cells;
Placing the assembled battery and the pair of wedge members in the battery case while applying a compressive force from both sides of the pair of wedge members so that the assembled battery is deformed in a convex shape toward the bottom portion And a method of manufacturing a battery.

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