WO2008050721A1

WO2008050721A1 - Tubular electricity source and electricity source body

Info

Publication number: WO2008050721A1
Application number: PCT/JP2007/070556
Authority: WO
Inventors: Takashi Murata
Original assignee: Toyota Jidosha Kabushiki Kaisha
Priority date: 2006-10-25
Filing date: 2007-10-22
Publication date: 2008-05-02
Also published as: JP2008135357A

Abstract

[PROBLEMS] A tubular electricity source installed on an installation member is prevented from rotating with rotation of a fastening member. [MEANS FOR SOLVING PROBLEMS] The tubular electricity source (2) is installed on the installation member (1) via first and second screw shafts (21, 22) provided on both sides of a tubular electricity source body. The first and/or the second screw shaft is eccentric with respect to the longitudinal center axis (Y1) of the tubular electricity source body.

Description

Specification

Cylindrical power supply and power supply

Technical field

[0001] The present invention relates to a cylindrical power source attached to a mounting member and a power source body in which the cylindrical power sources are connected in series.

Background art

[0002] In recent years, in response to growing environmental awareness, there is a movement to shift the power source of automobiles from engines that use fossil fuels to motors that use electrical energy. For this reason, the technology of batteries that serve as power sources for motors is also rapidly developing.

[0003] For example, in a hybrid vehicle, a power storage device having a small size, light weight, high output, and long device life is desired as a driving or auxiliary power source, and an assembled battery in which batteries are connected in series or in parallel is used.

[0004] Japanese Patent No. 3650659 (Patent Document 1) discloses a cylindrical battery in which an internal thread is formed on a pole column passing through the center of the cylindrical battery.

With reference to FIG. 8, a conventional assembled battery assembly method using a cylindrical battery will be described. here

FIG. 8A is a perspective view of a conventional cylindrical battery, and FIG. 8B is a cross-sectional view of the conventional cylindrical battery.

[0006] Convex positive electrode screw shaft portion 210 and negative electrode screw shaft portion 211 are provided at both ends of cylindrical battery 200. Screw grooves are formed in the outer peripheral surfaces of the positive and negative screw shaft portions 210 and 211. The screw shaft Y of the positive electrode screw shaft portion 210 and the screw shaft Y of the negative electrode screw shaft portion 211 are cylindrical batteries 2

twenty three

It is arranged coaxially with the longitudinal central axis Y of 00.

[0007] A large number of insertion hole portions are formed in a matrix in a pair of opposed battery folders (not shown), and positive and negative screw shaft portions 210 and 211 are inserted into these insertion hole portions. The cylindrical battery 200 is supported by being inserted between the battery folders.

[0008] Each cylindrical battery 200 is fixed to the battery folder by fastening the fastening nut 230 from above the nose 300 to the positive and negative screw shaft portions 210 and 211 protruding from the battery folder. Patent Document 1: Patent No. 3650659 Specification

Patent Document 2: JP 2000-106164 A

Patent Document 3: Japanese Patent Laid-Open No. 2005-353547

Patent Document 4: Japanese Patent Laid-Open No. 2002-260605

Disclosure of the invention

Problems to be solved by the invention

[0009] However, in the above-described configuration, the screw shafts Y and Y and the central shaft Y are arranged coaxially.

2 3 1

Therefore, the cylindrical battery 200 may rotate in accordance with the rotation operation of the nut 230. For this reason, there is a possibility that the negative electrode portion 210 that is rotated contacts the hole portion of the battery folder or the bus bar, and an excessive load force is applied.

[0010] In addition, when the screw shafts Y and Y are arranged coaxially with the central shaft Y, the battery element may

2 3 1

The area of the gas release valve and the electrolyte inlet for ejecting the gas generated from the battery to the outside of the battery is reduced.

Accordingly, a first object of the present invention is to suppress the rotation of the cylindrical power source in accordance with the rotation operation of the fastening member.

[0012] A second object of the present invention is to make the space for forming the gas release valve wider than that of the prior art.

[0013] A third object of the present invention is to make the space for forming the electrolyte solution inlet wider than that of the prior art.

Means for solving the problem

[0014] In order to achieve the first object, the cylindrical power source of the present invention is attached to the attachment member via first and second screw shaft portions provided at both ends of the cylindrical power source body. In the cylindrical power supply, the first and / or second screw shaft portions are eccentric with respect to a longitudinal central axis of the cylindrical power supply main body.

Here, the cylindrical power source can be attached to the attachment member by fastening the fastening member to the first and second screw shaft portions.

[0016] In order to achieve the second object, the cylindrical power source body is sealed, a holding part for holding the first screw shaft part is provided, and a gas release valve is provided in the holding part. Provided The first screw shaft portion and the gas release valve may be provided at different positions in a direction perpendicular to the central axis in the longitudinal direction.

[0017] In order to achieve the third object, the cylindrical power source body is sealed, and a holding part for holding the first screw shaft part is provided, and an electrolytic solution injection is provided in the holding part. Provided with an inlet, the first screw shaft portion and the electrolyte injection port may be provided at different positions in a direction perpendicular to the central axis in the longitudinal direction.

[0018] Further, when viewed from the direction of the longitudinal central axis, the first and second screw shaft portions are arranged coaxially or at positions corresponding to point symmetry with respect to the longitudinal central axis. Good. This cylindrical power source can be applied to a power source body in which a plurality of cylindrical power sources are arranged in parallel and electrodes of adjacent cylindrical power sources are connected in series via a conductive plate. In this case, the distance between the electrodes connected by the electrode plate can be made equal by making the first and second electrodes also serve as the electrodes.

The invention's effect

[0019] According to the present invention, when the fastening member is fastened to the first and second screw shaft portions, it is possible to prevent the cylindrical power source from rotating according to the rotational operation of the fastening member.

Brief Description of Drawings

FIG. 1 is a perspective view of an assembled battery.

FIG. 2A is a perspective view of a cylindrical battery.

FIG. 2B is a cross-sectional view of a cylindrical battery.

FIG. 3 is a plan view of the assembled battery.

FIG. 4 is a longitudinal step view of a cylindrical battery.

FIG. 5 is a longitudinal step view of a cylindrical battery of Example 2.

FIG. 6A is a perspective view of a screw shaft portion.

FIG. 6B is a perspective view of a screw shaft portion (modified example).

FIG. 7A is a perspective view of a screw shaft part of Example 3.

FIG. 7B is a perspective view of a screw shaft portion (modified example) of Example 3.

FIG. 8A is a perspective view of a conventional cylindrical battery.

FIG. 8B is a cross-sectional view of a conventional cylindrical battery. BEST MODE FOR CARRYING OUT THE INVENTION

[0021] Examples of the present invention will be described below.

[0022] (Example 1)

(Schematic configuration of assembled battery)

With reference to FIG. 1, FIG. 2 and FIG. 3, the structure of the assembled battery (power supply body) of the present embodiment will be described. This assembled battery is configured by arranging a plurality of cylindrical batteries (cylindrical power sources) of this embodiment side by side, and the electrodes of adjacent cylindrical batteries are connected in series via a bus bar. FIG. 1 is a perspective view of the assembled battery. FIG. 2 is a schematic view of a cylindrical battery, FIG. 2A is a perspective view, FIG. 2B is a cross-sectional view, and a negative electrode screw shaft portion 22 is projected by hatching. FIG. 3 is a plan view of the assembled battery, and the fastening nut is omitted for ease of explanation. The cylindrical battery is a lithium ion battery.

[0023] In these drawings, the assembled battery A includes a pair of battery folders la and lb (mounting members) arranged to face each other, and 32 battery packs arranged so as to pass between the battery folders la and lb. (8 (X-axis direction) X 4 (Y-axis direction)) cylindrical batteries 2 to 2. Cylindrical type

1 32

The batteries 2 to 2, 2 to 2, and 2 to 2 are not shown.

10 16 18 24 26 32

[0024] A positive electrode screw shaft portion 21 (first screw shaft portion) is provided at one end of each cylindrical battery 2, and a screw groove portion 21a is formed on the outer peripheral surface of the positive electrode screw shaft portion 21. ing. A negative electrode screw shaft portion 22 (second screw shaft portion) is provided at the other end of each cylindrical battery 2, and a screw groove portion 22 a is formed on the outer peripheral surface of the negative electrode screw shaft portion 22. Yes. The positive and negative screw shafts Y and Y of the positive and negative screw shaft portions 21 and 22 are connected to each other as shown in FIG.

twenty three

Are arranged at point-symmetrical positions eccentric with respect to the central axis Y in the longitudinal direction.

[0025] That is, the distance between the longitudinal center axis Y and the positive screw shaft Y is L, and the longitudinal center axis

1 2 1

When the distance between the Y and negative screw shaft Y is L, L = L. These axes Y, Y

1 3 2 1 2 1 2 and Y are in the same plane.

Three

[0026] In the battery folders la and lb, a plurality of insertion holes l la and l ib for inserting the positive and negative screw shafts 21 and 22 of each cylindrical battery 2 are formed in a matrix. When these cylindrical batteries 2 are attached to the battery folders la and lb, the positive and negative screw shaft portions 21 and 22 protrude from the insertion holes l la and l ib to the outside of the battery folder 1 ( See Fig. 1 Akira)

[0027] Cylindrical batteries 2 2 arranged in the uppermost row, as shown in FIG.

1 8

They are arranged side by side in the direction of arrow X so that the directions of are opposite to each other.

[0028] Specifically, the positive electrode screw shaft portion 21 of the cylindrical battery 2 is inserted into the insertion hole portion a of the battery folder la, and the negative electrode screw shaft portion 22 is inserted into the insertion hole of the battery folder lb. Part l ib is purchased.

[0029] The cylindrical battery 2 adjacent to the cylindrical battery 2 in the direction of the arrow X is a cylindrical battery.

1 2

2 is rotated 180 ° in the YZ plane and rotated 180 ° around the longitudinal central axis Y. The positive and negative screw shafts 21 22 of the cylindrical battery 2

2

Respectively, they are inserted into the insertion holes l ib and 11a.

[0030] The cylindrical battery 2 2 2 has the same arrangement as the cylindrical battery 2, and the cylindrical battery 2

3 5 7 1 4

2 2 has the same arrangement as the cylindrical battery 2.

6 8 2

[0031] Of the cylindrical batteries 2 2 arranged side by side in the upper middle row, cylindrical batteries 2 2 2 2

9 16 9 11 13 1 has a negative screw shaft 22 arranged on the battery folder la side (that is, the cylindrical battery 2

5 2), the cylindrical battery 2 2 2 2 has a positive screw shaft 21 on the battery folder la side.

10 12 14 16

Placed (that is, the same as cylindrical battery 2).

[0032] Further, in the cylindrical batteries 2 2 arranged side by side in the lower middle row, the cylindrical batteries 2 2 2

17 24 17 19 2 2 positive screw shaft 21 is arranged on the battery folder la side (that is, cylindrical battery

one two Three

2), the negative screw shaft 22 of the cylindrical battery 2 2 2 2 is the battery folder la side

1 18 20 22 24

(That is, the same as the cylindrical battery 2).

2

[0033] Of the cylindrical batteries 2 2 arranged side by side in the bottom row, the cylindrical batteries 2 2 2

25 32 25 27 29

The negative electrode screw shaft 22 of 2 is arranged on the battery folder la side (that is, the cylindrical battery 2

31 2), the positive screw shaft 21 of the cylindrical battery 2 2 2 2

26 28 30 32

Placed (that is, the same as cylindrical battery 2).

[0034] Two bus bar openings 3a are formed in the bus bar (conductive plate) 3 side by side in the direction of the arrow X, and the positive and negative screws of the adjacent cylindrical battery 2 are formed in these openings 3a. Shaft portion 21 22 is inserted. Thereby, each cylindrical battery 2 can be connected in series. For example, copper can be used as the material of the bus bar 3. Here, as described above, the screw shafts Y and Y of the positive and negative screw shaft portions 21 and 22 are arranged in the longitudinal direction.

twenty three

It is arranged at a point-symmetrical position eccentric with respect to the central axis Y. Thereby, all the intervals between the positive and negative screw shaft portions 21 and 22 connected via the bus bar 3 can be made equal. As a result, the same size bus bar 3 can be used, and the cost S can be reduced.

[0036] The screw shafts Y and Y are arranged coaxially with respect to the longitudinal central axis Y.

2 3 1

You can also. Even when arranged on the same axis, the intervals between the positive and negative screw shafts 21 and 22 connected via the node 3 can all be made equal.

[0037] Fastening nuts (fastening members) 23 are fastened to the positive and negative screw shaft portions 21 and 22 inserted into the bus bar opening 3a. The fastening nuts 23 are connected to the positive and negative screw screw shaft portions 21. , 22 can be used to fix the cylindrical battery 2 to the battery folder 1.

[0038] Here, when the fastening nut 23 is fastened to the positive electrode screw shaft 21, rotation about the positive screw shaft Y is performed.

2 Force is applied to the cylindrical battery 2.

[0039] However, the positive screw shaft Y is eccentric with respect to the longitudinal central axis Y of the cylindrical battery 2.

twenty one

Therefore, it is possible to prevent the cylindrical battery 2 from rotating according to the rotating operation of the fastening nut 23 due to the moment.

[0040] Thereby, the negative electrode screw shaft portion 22 can be kept in contact with the bus bar opening portion 3a and the insertion hole portion l ib by rotating, and an excessive load can be suppressed. The same effect can be obtained when the fastening nut 23 is fastened to the negative electrode screw shaft portion 22.

(Detailed configuration of cylindrical battery 2)

Next, the configuration of each cylindrical battery 2 will be described in detail with reference to FIG. A battery body 25 is incorporated inside the cylindrical battery canister 24.

[0041] In this battery body 25, a strip-like positive electrode body 25b with a positive active material applied on both sides and a strip-like negative electrode body 25c with a negative active material applied on both sides are spirally formed via a separator 25a. Constructed by winding!

[0042] An electrolytic solution is injected inside the battery jacket 24, and a battery body is contained in the electrolytic solution.

25 is immersed. The electrolytic solution may be impregnated in the separator 25a. [0043] As the positive active material, lithium transition element composite oxides LiCoO, LiNiO, LiFeO, LiCuO, LiMnO, LiMO (M is at least two kinds selected from the group consisting of Co, Ni, Fe, Cu, and Mn) Transition element), LiMn 2 O 3. As a negative active material,

twenty four

There is no particular limitation as long as muon can be occluded and released electrochemically. Specific examples include natural graphite, artificial graphite, coatas, organic fired bodies, and metal chalcogenides.

[0044] Lithium salts used as electrolyte solutes include LiCIO, LiCFSO, LiPF, L

4 3 3 6 iN (CF SO), LiN (C F SO), LiBF, LiSbF and LiAsF

3 2 2 2 5 2 2 4 6 6 Organic solvents used to dissolve um salt include cyclic carbonates such as ethylene carbonate, propylene carbonate, vinylene carbonate, butylene carbonate, and the like.

And a mixed solvent with a chain carbonate such as dimethylolene carbonate, jetinole carbonate, methinoreethino carbonate and the like.

[0045] Disc shaped current collecting plates 26 are welded to both ends of the battery body 25 in the battery longitudinal direction (Y direction). Examples of the material for the current collector plate 26 include aluminum foil, stainless steel foil, and copper foil.

The current collector plate 26 is electrically and mechanically connected to the positive and negative screw shaft portions 21 and 22 via the conductive wires 27.

The positive electrode screw shaft portion 21 is formed on a cylindrical screw pedestal portion 28, and this screw pedestal portion

28 is held by a disk-shaped flat plate portion (holding portion) 29. The positive electrode screw shaft portion 21, the screw base portion 28, and the flat plate portion 29 are integrally formed.

[0048] The screw shaft Y of the positive electrode screw shaft portion 21 is eccentric with respect to the longitudinal central axis Y of the cylindrical battery 2.

twenty one

The diameter of the screw base portion 28 is set larger than that of the positive electrode screw shaft portion 21.

In addition, the outer diameter of the flat plate portion 29 is set to be slightly larger than the inner diameter of the battery outer can 24, and the flat plate portion 29 is press-fitted into the battery outer can 24. In this manner, the battery body 25 can be reliably sealed by press-fitting the flat plate portion 29 into the battery mantle can 24.

In addition, a gas release valve 29 ′ that is recessed toward the inner side of the cylindrical battery 2 is provided on the outer surface of the cylindrical battery 2 in the flat plate portion 29. The gas release valve 29 or the flat plate portion 29 can be formed by punching. [0051] When the internal pressure in the cylindrical battery 2 rises excessively due to the gas generated by the temperature rise of the battery body 25, the gas release valve 29 'is destroyed and the gas is released to the outside of the cylindrical battery 2. That's the power S.

Thus, in the present embodiment, the positive screw shaft Y of the positive electrode screw shaft portion 21 is the longitudinal length of the cylindrical battery 2.

2

By decentering with respect to the direction center axis Y, the gas discharge valve 29 'can be used more than the conventional technology (in the conventional technology, the screw shaft and the longitudinal axis of the cylindrical battery are arranged coaxially). The formation area (area in the direction perpendicular to the longitudinal central axis Y) can be increased. Thereby, the safety of the cylindrical battery 2 can be enhanced. The gas release valve 29 ′ is also formed on the flat plate portion 29 of the negative electrode screw shaft portion 22.

[0053] When a nickel metal hydride battery is used as the cylindrical battery 2, a gas release valve 29 'composed of a spring type automatic return valve may be provided on the flat plate portion 29! /. This spring-type automatic return valve can be configured by providing a movable valve in an opening formed in the flat plate portion 29 so as to be movable in the thickness direction, and attaching the spring to this movable valve.

[0054] When the internal pressure in the cylindrical battery 2 rises, the movable valve is piled up in the panel force of the spring and retreated from the inside of the opening, and gas is released to the outside of the cylindrical battery 2 through the opening. When the internal pressure decreases due to gas release, the movable valve returns to the opening due to the panel force of the spring.

[0055] The positive and negative screw shaft portions 21 and 22 may be configured as shown in FIG. 6A. Here, FIG. 6A is a perspective view of the positive electrode (negative electrode) screw shaft portion 21 (22). The positive electrode (negative electrode) screw shaft portion 21 (22) is formed in a cylindrical shape, and a thread groove portion (female screw) is cut on the inner peripheral surface. The positive electrode (negative electrode) screw shaft portion 21 (22) is held by a flat plate portion 29, and the positive electrode (negative electrode) screw shaft portion 21 (22) and the flat plate portion 29 are integrally formed.

Each cylindrical battery 2 can be fixed to the battery folder 1 by fastening a bolt (fastening member) (not shown) to the positive electrode (negative electrode) screw shaft portion 21 (22).

(Example 2)

With reference to FIG. 5, two cylindrical batteries according to this embodiment will be described. Here, FIG. 5 is a cross-sectional view of the cylindrical battery 2 ′ of the present embodiment. However, the same constituent elements as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

[0057] Both ends of the cylindrical battery 2 'are sealed by a sealing portion 24' constituting a part of the battery jacket 24. The conductive wire 27 drawn from the current collector plate 26 is welded to the sealing portion 24 '.

[0058] Positive and negative electrode screw shaft portions 21, 22 are welded to the outer surface of the sealing portion 24 ', and the screw shafts of the positive and negative electrode screw shaft portions 21, 22 are the same as in the first embodiment. Y and Y are longitudinal centers

twenty three

It is arranged at a point-symmetrical position eccentric with respect to the axis Y. It is also possible to arrange them coaxially with respect to the central axis Y in the longitudinal direction. According to the configuration described above, it is possible to obtain the same effect as in the first embodiment. Furthermore, since the positive and negative electrode screw shaft portions 21 and 22 are welded to the sealing portion 24 ′, the battery can be kept sealed in the replacement operation of the positive and negative electrode screw shaft portions 21 and 22.

[0059] The positive and negative screw shaft portions 21 and 22 may be configured as shown in FIG. 6B. Here, FIG. 6B is a perspective view of the positive electrode (negative electrode) screw shaft portion 21 (22). Positive (negative electrode) screw shaft formed in a cylindrical shape

A thread groove (female thread) is cut in the inner peripheral surface of 21 (22). The positive electrode (negative electrode) screw shaft portion 21 (22) is welded to the sealing portion 24 ′.

Each cylindrical battery 2 ′ can be fixed to the battery folder 1 by fastening a bolt (fastening member) (not shown) to the positive electrode (negative electrode) screw shaft portion 21 (22).

[Example 3]

Next, a cylindrical battery as a cylindrical power source of the present embodiment will be described with reference to FIG. Here, FIG. 7 is a perspective view of the positive electrode screw shaft portion 21.

In FIG. 7A, an electrolyte inlet 41 having a circular cross section is formed at a position corresponding to the gas release valve 29 ′ of the cylindrical battery 2 of the first embodiment. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.

As described above, the positive screw shaft Y of the positive electrode screw shaft portion 21 is eccentric with respect to the longitudinal central axis Y of the cylindrical battery 2, thereby widening the liquid injection area of the electrolyte injection port 41. Can

2

. Thereby, the injection | pouring operation | work of electrolyte solution can be facilitated.

[0064] The shape of the electrolyte solution injection port 41 may be a long hole shape as shown in Fig. 8B.

Further, the electrolyte solution injection port 41 can also be formed in the flat plate portion 29 of the negative electrode screw shaft portion 22. According to the present embodiment, the same effect as in the first embodiment can be obtained.

(Modification) The screw shafts Y and Y of the positive and negative screw shafts 21 and 22 are longitudinally neither symmetrical nor coaxial.

twenty three

It can also be arranged at a position eccentric with respect to the direction center axis Y. In this case, the screw shaft Y and

1 2 Place one of the rods on the same axis as the longitudinal central axis Y and the other in the longitudinal direction.

3 1

The central axis Y may be eccentric, or both axes may be eccentric with respect to the longitudinal central axis Y.

[0065] According to the above-described configuration, the cylindrical battery 2 (2 can be prevented from rotating according to the rotation operation of the fastening member (fastening nut 23, fastening bolt). Thereby, the bus bar opening 3a is inserted. The positive electrode (negative electrode) screw shaft portion 21 (22) (screw shaft portion on the opposite side of the fastening side) abuts on the hole portion 11a (l ib), and an excessive load can be suppressed.

[0066] In addition, the present invention uses a bipolar electrode in which a positive electrode layer is formed on one surface of a current collector and a negative electrode layer is formed on the other surface via an electrolyte. It can be applied to cylindrical bipolar batteries (cylindrical power supply), cylindrical electric double layer capacitors (cylindrical power supply), and cylindrical fuel cells (cylindrical power supply).

Furthermore, the present invention can be applied not only to a cylindrical power source but also to a square cylindrical power source. The above-described cylindrical power source can be used as a power source for driving a motor in, for example, an electric vehicle (EV), a hybrid vehicle (HEV), and a fuel cell vehicle (FCV).

Claims

The scope of the claims

[1] A cylindrical power source that is attached to an attachment member via first and second screw shaft portions provided at both ends of a cylindrical power source body,

The cylindrical power source characterized in that the first and / or second screw shaft portions are eccentric with respect to a longitudinal central axis of the cylindrical power source body.

[2] The fastening member is fastened to the first and second screw shafts.

The cylindrical power source according to 1.

[3] The cylindrical power source body is sealed, and a holding portion that holds the first screw shaft portion is provided.

The holding portion is provided with a gas release valve, and the first screw shaft portion and the gas release valve are provided at different positions in a direction orthogonal to the longitudinal central axis. The cylindrical power supply according to claim 1 or 2.

[4] The cylindrical power source body is sealed, and a holding portion that holds the first screw shaft portion is provided.

The holding portion is provided with an electrolyte injection port, and the first screw shaft portion and the electrolyte solution injection port are provided at different positions in a direction orthogonal to the longitudinal central axis. The cylindrical power supply according to claim 1 or 2, wherein

[5] When viewed from the direction of the longitudinal central axis, the first and second screw shaft portions are arranged on the same axis or at positions corresponding to point symmetry with respect to the longitudinal central axis. The cylindrical power supply according to any one of claims 1 to 4, characterized in that:

[6] A power source body in which a plurality of cylindrical power sources are arranged in parallel and electrodes of adjacent cylindrical power sources are connected in series via a conductive plate,

The cylindrical power source is the cylindrical power source according to claim 5, wherein the first and second screw shaft portions also serve as the electrode, and the distance between the electrodes connected by the conductive plate is equal. A power supply unit characterized by