JP4934973B2 - Assembled battery - Google Patents

Description

  The present invention relates to an assembled battery.

  Among what is provided as a secondary battery, there is an assembled battery in which a plurality of unit batteries are packaged in an outer package such as a can. For example, an assembled battery in which such a plurality of unit cells are combined into a single package is used for a secondary battery having a high output and a high capacity such as an electric vehicle, a hybrid vehicle, and a fuel cell vehicle.

As a conventional assembled battery, for example, there is an assembled battery in which a plurality of unit batteries, each of which is laminated and packaged, are filled with a resin material inside the outer package so that each unit battery is covered with the resin material. According to this assembled battery, by covering each single battery with resin, even in a usage situation where vibration is applied, the vibration of each single battery inside the assembled battery is absorbed, and the occurrence of problems due to vibration can be suppressed. It is possible.
JP 2001-162989 A

  However, in such a conventional assembled battery, since the entire unit cell is covered with resin by filling the exterior body with resin, the periphery of the unit cell is surely covered when the exterior body is filled with resin. There is a problem that it is difficult.

  In addition, there is a problem that it is difficult to disassemble the assembled battery once the exterior body is filled with resin. This has a problem that, for example, disassembling in the recycling work when the assembled battery is discarded becomes troublesome. Moreover, in such an assembled battery filled with resin, when only one (or a plurality) of the unit batteries are defective, the resin is completely removed when a part of the unit battery is replaced. However, there is a problem that the reuse cost substantially increases.

  Accordingly, an object of the present invention is to prevent a unit cell in the exterior body from being displaced by a vibration or causing a problem due to the vibration even when vibration is applied, and to be easily manufactured and disassembled. It is to provide a battery.

In order to solve the above problems, the present invention provides a plurality of unit cells in which a power generation element is sealed by bonding laminate materials at a peripheral portion, and the surface friction coefficient is greater than the friction coefficient of the outer surface of the laminate material. It is formed by a material high, and abuts against the peripheral portion among the plurality of single cells, and a vibration prevention member which is disposed so as to surround the entire periphery of the unitary battery, and the vibration prevention member and the elemental cell have a, and an exterior body for housing in a stacked state, the vibration preventing member is made of elastic material, said optionally be compressed when stored in the outer package, the outer surface of the single cell and the vibration prevention member The battery pack is characterized in that the space surrounded by is negative pressure .
In addition, the present invention for solving the above-mentioned problems includes a plurality of unit cells in which a power generation element is sealed inside by bonding laminate materials at the periphery, and a friction coefficient of the surface is a friction of the outer surface of the laminate material. An anti-vibration member that is formed of a material higher than a coefficient and is disposed so as to contact the peripheral portion between the plurality of unit cells, and an exterior body that stores the unit cells and the vibration-prevention member in a stacked state. The vibration preventing member is made of an elastic material, and the surface of the unit cell that contacts the peripheral portion is concave before being housed in the exterior body, and is housed in the exterior body. The assembled battery is characterized in that the air in the concave portion is removed in contact with the peripheral portion and the vibration preventing member is adsorbed to the peripheral portion of the unit cell.

  According to the present invention, since the vibration preventing member having a friction coefficient higher than the friction coefficient of the outer surface of the laminate material is disposed only in the peripheral part of the laminated packaged unit battery, even when vibration is applied to the assembled battery, The single battery can be prevented from shifting due to the frictional force with the vibration preventing member, so that it is possible to prevent the occurrence of problems due to vibration, and the single battery and vibration preventing member are not joined, so that they can be manufactured and disassembled. Easy.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view showing a schematic structure of the assembled battery of the present embodiment, FIG. 2 is a perspective view showing the assembled battery shown in FIG. 1 turned upside down and disassembled, and FIG. 3 is housed in the assembled battery. It is a perspective view which shows one of the flat type batteries which are the unit cells which are.

  As shown in FIGS. 1 and 2, the assembled battery 10 includes a cell unit 20 including a plurality of flat batteries 40 housed in a battery outer package 30.

  The cell unit 20 is formed by alternately stacking a plurality of flat batteries 40 (see FIG. 3) in which power generation elements are sealed with a laminate film and the like and alternately connecting positive and negative electrodes. In addition, although eight sheets are laminated | stacked in the example shown in FIG. 2, the number of laminated | stacked is not limited.

  The flat battery 40 is a unit battery, and is a laminate package in which a power generation element composed of a laminate in which a positive electrode plate, a negative electrode plate, and a separator are laminated and an electrolyte is sealed with a laminate material. In the laminate package, the laminate materials are joined to each other at the periphery by heat fusion or the like. At the time of packaging, the electrode tabs 41 and 42 as the positive electrode terminal and the negative electrode terminal are led out from both ends. In addition, as a power generation element of such a laminated package battery, for example, a lithium-titanium ion secondary battery can be cited.

  The cell unit 20 includes an insulating spacer 21 that holds electrode tabs 41 and 42 extending from each flat battery 40, and positive and negative output terminals 22 and 23. The insulating spacer 21 is provided with an insertion port 24 into which a connector connected to the voltage detection terminal is inserted. The insertion port 24 is also exposed from the battery exterior body 30 when the cell unit 20 is accommodated in the battery exterior body 30. The positive and negative output terminals 22 and 23 are also exposed from the battery exterior body 30.

  A vibration preventing member 101 is provided around each flat battery 40 (details will be described later).

  The battery exterior body 30 includes a container 31 having an opening on one surface and a lid body 32 that closes the opening of the container 31.

  The container 31 includes a substantially rectangular base surface 33 and a side surface 34 extending substantially perpendicularly from the outer peripheral edge of the base surface 33. The side surface 34 is provided with notches 34a, 34b, and 34c for exposing the insertion port 24 and the positive and negative output terminals 22 and 23 when the cell unit 20 is housed.

  The lid 32 is wound around the side surface 34 of the container 31 by caulking (see an enlarged view of FIG. 1). Because of the caulking process, the joint 35 that joins the lid 32 and the container 31 protrudes along the side surface 34 of the container 31.

  The container 31 and the lid body 32 are formed from a relatively thin steel plate or aluminum plate, and are given a predetermined shape by pressing.

  When the cell unit 20 is housed, the positions of the through hole 25 provided in the insulating spacer 21 of the cell unit 20 and the hole 36 provided in the base surface 33 and the lid 32 match.

  Hereinafter, the vibration preventing member 101 of the flat battery 40 in the assembled battery 10 will be described.

  4 is a plan view of a state where the vibration preventing member 101 is placed on the flat battery 40, FIG. 5 is a perspective view of the vibration preventing member, and FIG. 6 is a schematic view for explaining assembly of the assembled battery. In FIG. 6, in order to facilitate understanding of this embodiment, constituent members other than the flat battery 40 and the vibration preventing member 101 are not shown.

  The vibration preventing member 101 is disposed so as to contact the peripheral portion 45 (see FIG. 3) of the flat battery 40. As can be seen from FIG. 3, the peripheral portion 45 is a laminate seal portion in the flat battery 40 that is laminated. Therefore, the vibration preventing member 101 has a frame shape. Further, the vibration preventing member 101 is made of a material that is elastic and whose surface has a higher coefficient of friction than that of the outer surface of the laminate material of the flat battery 40.

  Here, the laminate material of the flat battery 40 is usually a polyamide resin (for example, nylon (registered trademark)) layer-aluminum layer-polypropylene layer from the outside of the battery, or a polyethylene layer-aluminum layer-polypropylene layer from the outside of the battery. For example, in the case of a polyamide-based resin layer-aluminum layer-polypropylene layer from the outside, the friction coefficient of the outer surface is about 0.33, and from the outside, a polyethylene layer-aluminum layer-polypropylene layer But it's not much different.

  Therefore, it is preferable that the friction coefficient of the surface of the vibration preventing member 101 (at least a portion in contact with the flat battery 40) is larger than 0.33. From such a viewpoint, the material is preferably an elastic material, for example, chloroprene rubber (CR), butyl rubber (IIR), natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR) and the like are preferable. These friction coefficients are all 2.0 or more.

  The shape of the vibration preventing member 101 is formed so that the side surface has a wedge shape. Thereby, it is easy to shrink | contract in a compression direction (direction which laminates the flat battery 40), and it is trying for an elastic force to come out.

  When assembling the assembled battery, first, as shown in FIG. 6A, the vibration preventing member 101 and the flat battery 40 are alternately stacked. After that, the output terminals 22 and 23 are attached to the electrode tabs 41 and 42 to form the cell unit 20, which is put in the container 31 of the outer package 30 as shown in FIG. The lid 32 is closed and the crimping is stopped.

  As shown in FIG. 7A, the vibration preventing member 101 has a height H in the compression direction that is equal to the thickness t of the power generation element portion of the flat battery 40 in a state before being housed in the exterior body 30. It is formed larger than the dimensions. Therefore, when the lid 32 is closed, the vibration preventing member 101 is compressed as shown in FIG.

  According to the present embodiment configured as described above, an elastic material having a high friction coefficient is provided around the flat battery 40 as the vibration preventing member 101, so that the interior of the outer package 30 can be obtained even when vibration is applied to the assembled battery. The vibration of the flat battery 40 can be suppressed and the vibration preventing member 101 merely suppresses the flat battery 40 by frictional force (that is, the single battery and the vibration preventing member are not joined). ), Easy to manufacture and disassemble. Therefore, the vibration preventing member 101 and the flat battery 40 can be easily separated when disassembling later, and the parts can be easily recycled, and a part or a plurality of the flat batteries 40 can be replaced. Even when doing so, it can be easily disassembled and replaced.

  Further, since the vibration preventing member 101 is disposed so as to surround the entire periphery of the flat battery 40, when the lid 32 is closed, when it is compressed as shown in FIG. The air inside it escapes. For this reason, when the flat battery 40 is about to be displaced, the inside thereof is in a negative pressure state, and the vibration preventing member 101 as a whole is attracted to the flat battery 40, thereby further suppressing the displacement of the flat battery 40. be able to.

  Furthermore, since the vibration preventing member 101 does not come into contact with the portion of the flat battery 40 in which the laminated package is stored, the vibration preventing member 101 does not press the power generating element portion. .

  Here, when the vibration preventing member 101 is compressed, the air inside the vibration preventing member 101 escapes from the gap between the flat battery 40 and the vibration preventing member 101. For example, as shown in FIG. 8, a check valve 102 for extracting air may be attached to a part of the side surface of the vibration preventing member 101. In this case, when the lid body 32 is closed, the inner air easily escapes from the check valve 102, so that the applied pressure when showing the lid body 32 can be reduced. The check valve 102 is attached in such a direction that air flows from the inside to the outside of the vibration preventing member 101 but does not flow from the outside to the inside.

  Furthermore, when using the vibration preventing member 101 to which the check valve 102 is attached in this way, after putting the cell unit in a state in which the flat battery 40 and the vibration preventing member 101 are stacked in the container 31, the lid is closed. By reducing the ambient atmosphere, the air inside the vibration preventing member 101 is removed, and when the pressure is returned to normal pressure, the inside of the vibration preventing member 101 becomes a vacuum state and the flat battery 40 is further reduced. Deviation can be suppressed. The exterior body 30 is not airtight.

  Further, after assembling, the assembled battery 10 after assembling is heated to such an extent that the internal constituent members are not thermally deteriorated, and then left to cool down, or the inside of the vibration preventing member 101 can be in a vacuum state (depressurized state). it can. By heating the assembled battery after assembly, the air inside the vibration preventing member 101 expands and is exhausted from the check valve 102. After that, when it cools, the air is exhausted and the pressure is reduced. .

(Second Embodiment)
FIG. 9 is an explanatory diagram for explaining a configuration of a vibration preventing member according to the second embodiment. FIG. 10 is a plan view for explaining the configuration of the vibration preventing member. FIG. 10A is a view seen from the upper surface, and FIG. FIG. 11 is a side view for explaining the configuration of the vibration preventing member, (a) is a side view on the side with the electrode tab, and (b) is a side view on the long side direction side (the side without the electrode tab side). FIG. Note that the second embodiment is different only in the structure of the vibration preventing member, and the other configuration is the same as that of the first embodiment, and the description thereof will be omitted.

  As shown in FIG. 9, in the second embodiment, the vibration preventing member 111 is made larger than the outer periphery of the flat battery 40. As a result, as shown in the figure, the flat battery 40 and the vibration preventing member 111 are stacked and housed in the exterior body 30, so that the portion 115 of the vibration preventing member 111 that protrudes from the peripheral portion 45. Comes into contact with the vibration preventing member 111 underneath, and the contact portions of the vibration preventing members 111 are brought into close contact with each other by elastic force. Thereby, the part to which the vibration preventing member 111 is closely attached can function as a sealing member that keeps the outside of the flat battery 40 watertight.

  As described above, the vibration preventing member 111 is arranged only around the flat battery 40 and is formed so as to protrude from the peripheral portion of the flat battery 40 as described above. Therefore, as shown in FIGS. 10 and 11, the vibration preventing member 111 is provided with a notch 113 for taking out the electrode tab on the side of the flat battery 40 where the electrode tab is provided.

  The size of the notch 113 is the same as the size of the electrode tab in the lateral direction w so that the electrode sub surely does not come out of the vibration preventing member 111 from the notch 113 portion and the vibration preventing member 111 is not turned up. Be large. On the other hand, the depth u of the notch 113 is preferably set to a depth slightly less than the thickness of the electrode tab. As a result, the vibration preventing member 111 is completely brought into close contact with the electrode tab by its elastic force so that water tightness can be maintained.

  Usually, a single battery (flat battery 40) that is laminated and packaged is itself watertight and airtight. However, in the unlikely event that the laminate is broken, the internal electrolyte may leak out.

  In the second embodiment, since the vibration preventing members 111 are in close contact with each other outside the flat battery 40 and function as a sealing member, the electrolyte solution leaks to the outside even in the event of damage to the laminate. Can be prevented.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment.

  For example, in the above-described embodiment, the side surface of the vibration preventing member is formed in a wedge shape. However, the shape is not limited to such a side surface shape. For example, as shown in FIG. As shown in FIG. 13, the vibration preventing member expands and contracts such that the side surfaces of the vibration preventing member 130 face each other so that the opposite side faces each other and the wedge tips face each other. It is possible to make it easy to do.

  Further, in the above-described embodiment, the vibration preventing member 101 or 111 is arranged so as to surround the entire periphery of the flat battery 40 which is a single battery, and the enclosed inner side has a negative pressure so as to have an adsorption action. In addition to this, for example, as shown in FIG. 14, the portion of the vibration preventing member 140 that contacts the peripheral portion 45 of the flat battery 40 is in a state before compression, that is, as shown in FIG. In the state before being housed in the exterior body 30, the surface 141 curved in a concave shape may be provided. As a result, when the vibration preventing member 101 or 111 is accommodated in the exterior body 10 and compressed, the air in the curved surface 141 is released as shown in FIG. Adsorb to the peripheral portion 45. And the shift | offset | difference of the flat battery 40 can be suppressed by this adsorption | suction effect | action.

  The present invention can be used for a secondary battery.

It is a perspective view which shows schematic structure of the assembled battery of embodiment. FIG. 3 is a perspective view showing the assembled battery upside down and further disassembled. It is a perspective view which shows the flat type battery accommodated in the said assembled battery. It is a top view of the state which mounted the vibration prevention member in the said flat battery. It is a perspective view of the said vibration prevention member. It is the schematic for demonstrating the assembly of the said assembled battery. It is explanatory drawing for demonstrating the state before and behind accommodated in the exterior body of a vibration preventing member. It is a perspective view which shows the other form of a vibration preventing member. It is explanatory drawing for demonstrating the structure of the vibration prevention member in 2nd Embodiment. It is a top view for demonstrating the structure of the said vibration prevention member, (a) is the figure seen from the upper surface, (b) is the figure seen from the lower surface. It is a side view for demonstrating the structure of the said vibration prevention member, (a) is a side view with the side with an electrode tab, (b) is a side view with the long side direction side (side without the electrode tab side). . It is the schematic for demonstrating the other structure of a vibration preventing member. It is the schematic for demonstrating other structure of a vibration preventing member. It is the schematic for demonstrating other structure of a vibration preventing member.

Explanation of symbols

10 ... assembled battery,
20 ... cell unit,
30 ... exterior body,
31 ... container,
32 ... the lid,
40 ... flat battery,
45 ... Peripheral part,
101, 111 ... vibration preventing member,
102 ... Check valve,
115 ... The protruding part.

Claims (9)

A plurality of unit batteries enclosing power generation elements inside by bonding laminate materials at the periphery,
Friction coefficient of the surface is formed by a material high than the frictional coefficient of the outer surface of the laminate material, and abuts on the peripheral portion among the plurality of single cells, and are arranged so as to surround the entire periphery of the unitary battery Vibration prevention member,
Have a, and an exterior body for housing in a stacked state and the vibration prevention member and the single cell,
The vibration preventing member is made of an elastic material, compressed in a state of being housed in the exterior body, and a space surrounded by the vibration preventing member and the outer surface of the unit cell is negative pressure. A battery pack featuring the features. The assembled battery according to claim 1 , wherein the vibration preventing member has a check valve for discharging air in a space surrounded by the vibration preventing member and an outer surface of the unit cell. The vibration preventing member has a concave shape before the surface contacting the peripheral portion of the unit cell is accommodated in the exterior body, and the air in the recessed shape portion is in a state of being accommodated in the exterior body. omission in contact with the peripheral portion, the battery pack according to claim 1 or 2, wherein said vibration prevention member is characterized by being adsorbed to the peripheral portion of the single cell. The height of the vibration preventing member, in a state which is not accommodated in the outer body, claim 1, wherein the greater than the dimension of the thickness of the portion which houses the power generating element of the single cell The assembled battery as described in any one of . The vibration prevention member is assembled battery according to any one of claims 1 to 4 sides not in contact with the peripheral portion is characterized by a wedge. 6. The assembled battery according to claim 5 , wherein the wedge shape has a wedge tip facing an inner direction of a space surrounded by the vibration preventing member and an outer surface of the unit cell. The vibration prevention member is assembled battery according to at least one of claims 1 to 6, wherein the vibration prevention member together further outside than the peripheral portion is in contact.   A plurality of unit batteries enclosing power generation elements inside by bonding laminate materials at the periphery,
  An anti-vibration member formed of a material having a surface friction coefficient higher than the friction coefficient of the outer surface of the laminate material, and disposed so as to contact the peripheral portion between the plurality of unit cells;
  An exterior body that houses the unit battery and the vibration preventing member in a stacked state,
  The vibration preventing member is made of an elastic material, and the surface of the unit cell that contacts the peripheral portion is concave before being housed in the exterior body, and the concave shape in the state of being accommodated in the exterior body. The assembled battery is characterized in that part of the air is released and comes into contact with the peripheral portion, and the vibration preventing member is adsorbed to the peripheral portion of the unit cell.   The assembled battery according to claim 8, wherein the vibration preventing member is disposed so as to surround the entire periphery of the single battery.

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