JP5375651B2 - Laminated cell battery structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate cell battery structure having a simple construction for adequately performing the cooling of batteries and the treatment of gas leaking during battery malfunction while preventing the mixed flow of battery cooling air and the gas leaking during battery malfunction. <P>SOLUTION: The laminate cell battery structure 1 includes a battery body 32 stored in a flexible sheet container 31, and a plurality of laminate cell batteries 3 laminated each of which has a pair of sheet electrodes 33A, 33B extracted from the battery body 32 to the outside of the sheet container 31. The plurality of laminate cell batteries 3 laminated are held in a holding frame 2 which holds four side portions thereof. In the holding frame 2, a cooling passage 23 through which cooling air A passes near the electrodes 33A, 33B, and an exhaust passage 24 through which gas G passes when leaking from an extracted end 301 of the electrodes 33A, 33B extracted from the sheet container 31 are formed distant from each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a laminate cell battery structure formed by laminating a plurality of laminate cell batteries.

Conventionally, there are various types of batteries. Among them, a laminated cell battery in which a battery main body is housed in a flexible sheet-like container formed by coating the surface of an aluminum base with an insulating resin, Many demands are expected because it is easy to manufacture and handle and is inexpensive.
Laminate cell batteries can be used by laminating a plurality of sheets and flexibly connecting the electrodes of each battery by any of the connection methods of parallel connection or series connection.

  For example, in the laminate type battery module of Patent Document 1, a laminate film is fused to form a safety valve, and this safety valve is opened at a predetermined pressure in order to discharge gas generated inside the battery to a smoke exhaust duct. It is configured to valve. According to this, when an abnormality occurs in the laminate cell battery, the safety valve can be preferentially cleaved compared to other parts.

JP 2006-92905 A

  However, in patent document 1, the device for cooling a laminated battery is not made | formed. Further, in the laminate type battery, it is necessary to separately provide a gas discharge path and a safety valve for the battery housing portion, which complicates the battery structure.

  The present invention has been made in view of the above-described conventional problems. With a simple structure, the present invention prevents a mixed flow of cooling air for cooling the battery and gas that leaks when the battery is abnormal, and leaks when the battery is cooled and when the battery is abnormal. An object of the present invention is to provide a laminated cell battery structure capable of appropriately performing gas treatment.

In the present invention, a battery main body is housed in a flexible sheet-like container, and a plurality of laminated cell batteries in which a pair of sheet-like electrodes are drawn out of the sheet-like container are stacked. Become
The laminated cell battery laminated with a plurality of sheets is held in a holding frame that holds the sides of the four sides,
The holding frame has a cooling passage for allowing cooling air to pass in the vicinity of the electrode, and a discharge for allowing the gas to pass in the case where the gas leaks from a drawing end portion where the electrode is drawn out in the sheet-like container. The laminated cell battery structure is characterized in that it is formed so as to be separated from the passage (claim 1).

The laminated cell battery structure of the present invention holds a laminated cell battery in which a plurality of layers are laminated in a holding frame, a function of cooling the battery with respect to the holding frame, and a function of discharging gas generated when the battery is abnormal. Are combined.
Specifically, the cooling passage is formed in the holding frame so as to allow the cooling air to pass through the vicinity of the electrodes of each laminate cell battery. Thereby, the electrode which is easy to be heated by the heat generation of the battery can be effectively cooled.
Further, the discharge passage is formed in the holding frame so as to allow the gas leaking from the drawing end of the sheet-like container to pass when the battery is abnormal. Thereby, when gas leaks from the drawer | drawing-out edge part of the sheet-like container considered that gas is easy to leak at the time of battery abnormality, this gas can be discharged | emitted outside.

The cooling passage and the discharge passage are formed separately. Thereby, it is possible to prevent the gas leaked when the battery is abnormal from being mixed into the cooling passage, and the cooling air flowing through the cooling passage can be treated as a safe gas. On the other hand, the gas flowing into the discharge passage can be processed so as not to affect the human body.
Therefore, according to the laminated cell battery structure of the present invention, the simple structure prevents the cooling air for cooling the battery and the gas leaked when the battery is abnormal, and prevents the gas leaking when the battery is cooled and the battery is abnormal. Processing can be performed appropriately.

The perspective view which shows the laminated cell battery structure in an Example. Cross-sectional explanatory drawing which expands and shows the one side frame part (other side frame part) in the holding frame of the laminated cell battery structure in an Example. Cross-sectional explanatory drawing which expands and shows the right and left side frame part in the holding frame of the laminated cell battery structure in an Example. The front view which shows the laminate cell battery structure in an Example. Cross-sectional explanatory drawing which expands and shows the extraction | drawer edge part of the electrode in the sheet-like container of a laminated cell battery in an Example. Cross-sectional explanatory drawing which expands and shows the side edge part in the sheet-like container of a laminated cell battery in an Example. The top view which shows the laminated cell battery structure which laminated | stacked the holding frame which comprises a connection cell group in an Example, and formed the lamination | stacking holding frame group. The top view which shows the laminated cell battery structure which arrange | positioned the lamination | stacking holding | maintenance frame frames adjacently in an Example. The front view which shows the other laminated cell battery structure in an Example.

A preferred embodiment of the above-described laminated cell battery structure of the present invention will be described.
In the present invention, the cooling passage is formed to allow cooling air to pass along the surface direction of the laminated cell battery, the discharge passage is formed adjacent to the cooling passage and parallel to the cooling passage, The cooling passage and the discharge passage are preferably separated by a partition provided in the holding frame.
In this case, the cooling air can be smoothly passed in the vicinity of the electrode of each laminated cell battery, and the cooling can be effectively performed. Further, the discharge passage is also appropriately formed, and the cooling passage and the discharge passage can be easily separated by the partition provided in the holding frame.

Further, it is preferable that the cooling passage is formed so as to penetrate the holding frame in the direction of the side end portion of the sheet-like container perpendicular to the drawer end portion.
In this case, the cooling air can be effectively passed through the cooling passage.

The pair of electrodes includes a plus electrode drawn from one side of the laminate cell battery and a minus electrode drawn from the other side of the laminate cell battery, and the cooling passage is formed by the plus electrode in the holding frame. Preferably, it is formed on one side frame part from which the negative electrode is drawn out and on the other side frame part from which the negative electrode is drawn out.
In this case, the plus electrode and the minus electrode in each laminated cell battery can be cooled more effectively.

Further, the discharge passage can be formed so as to penetrate the holding frame in the direction of the side end portion of the sheet-like container perpendicular to the drawer end portion (Claim 5).
In this case, it is easy to form the discharge passage.

The discharge passage is formed adjacent to the cooling passage and in parallel with the cooling passage, and is formed perpendicular to the first passage portion and a first passage portion for collecting gas leaking from the extraction end portion. The second passage portion that collects gas leaking from the side end portion of the sheet-like container orthogonal to the drawer end portion is communicated, and in the direction from the end portion of the first passage portion to the side end portion. It is preferable that it is opened (Claim 6).
In this case, the gas leaking from the drawing end and the side end of the sheet-like container of each laminated cell battery can be collected by the discharge passage, and this gas can be stably processed so as not to affect the human body.

Further, the laminate cell battery structure is for in-vehicle use, and it is preferable that the discharge passage communicates with the outside of the passenger compartment.
In this case, the gas generated when the battery is abnormal can be stably discharged outside the passenger compartment through the discharge passage.

Hereinafter, examples of the laminated cell battery structure of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the laminate cell battery structure 1 of this example includes a battery main body 32 housed in a flexible sheet-like container 31, and a pair of sheet-like electrodes 33 </ b> A from the battery main body 32. A plurality of laminated cell batteries 3 in which 33B is drawn out of the sheet-like container 31 are laminated. A laminated cell battery 3 in which a plurality of layers are laminated is held in a holding frame 2 that holds the four sides. In this holding frame 2, when the gas G leaks from the cooling passage 23 for allowing the cooling air A to pass through the vicinity of the electrodes 33A and 33B and the drawing end 301 from which the electrodes 33A and 33B are drawn out in the sheet-like container 31. The discharge passage 24 for allowing the gas G to pass therethrough is formed in isolation.

Below, it demonstrates in full detail with reference to FIGS. 1-9 about the laminated cell battery structure 1 of this example.
In this example, the pull-out direction H refers to the direction in which the electrodes 33A and 33B are pulled out from the laminate cell battery 3, and the left-right direction W refers to the direction perpendicular to the pull-out direction H in the plane direction of the laminate cell battery 3. Say. In addition, the stacking direction D refers to a direction in which a plurality of laminate cell batteries 3 are stacked.
The laminate cell battery structure 1 of this example is for in-vehicle use, and the cooling passage 23 communicates with the vehicle interior while the discharge passage 24 communicates with the outside of the vehicle interior.
As shown in FIG. 5, the sheet-like container 31 of this example is formed using a pair of aluminum sheets (aluminum laminate film) 311 whose inner peripheral side is covered with an insulating resin 312.
The pair of electrodes 33 </ b> A and 33 </ b> B in this example includes a plus electrode 33 </ b> A drawn from one side of the laminate cell battery 3 and a minus electrode 33 </ b> B drawn from the other side of the laminate cell battery 3.

The sheet-like container 31 is formed in a bag shape that accommodates the battery main body 32.
As shown in FIG. 5, the extraction end 301 in the vertical direction of the sheet-like container 31 (the extraction direction H of the electrodes 33 </ b> A and 33 </ b> B) includes the insulating resin 312 of the pair of aluminum sheets 311, the plus electrode 33 </ b> A and the minus electrode 33 </ b> B. Each insulating resin 331 applied on the surface is formed by welding. As shown in FIG. 6, the side end portion 302 of the sheet-like container 31 in the left-right direction W (the horizontal direction orthogonal to the drawing direction H of the electrodes 33 </ b> A and 33 </ b> B) lies between the insulating resins 312 facing each other of the pair of aluminum sheets 311. It is formed by welding or formed from a continuous aluminum sheet 311.
Further, in the laminate cell battery 3, an electrolytic solution is placed in a gap 30 in which the battery body 32 is disposed. The laminate cell battery 3 of this example is a lithium battery.

  As shown in FIGS. 5 and 6, the laminate cell battery 3 of the present example includes a sheet-shaped battery body 32 that is wrapped from both sides by a pair of aluminum sheets 311, and is provided at one end of the battery body 32. The positive electrode 33 </ b> A and the sheet-like negative electrode 33 </ b> B provided at the other end of the battery main body 32 are formed by being drawn out from between the ends of the pair of aluminum sheets 311. The seal portion in each sheet-like container 31 is formed at a leading end portion 301 from which the plus electrode 33A and the minus electrode 33B are drawn out, and a side end portion 302 from which these electrodes 33A and 33B are not drawn out. Further, the positive electrode 33A and the negative electrode 33B are formed of a conductor.

  As shown in FIG. 4, the holding frame 2 of this example includes one side frame portion 21A from which the plus electrode 33A is drawn out in the laminate cell battery 3, and the other side frame portion 21B from which the minus electrode 33B is drawn out from the laminate cell battery 3. The left and right side frame portions 22 orthogonal to the one side frame portion 21A and the other side frame portion 21B are combined to form a square frame shape.

As shown in FIG. 2, all of the plus electrodes 33 </ b> A and all of the minus electrodes 33 </ b> B of this example are drawn out in parallel to the surface direction of the laminate cell battery 3. All the positive electrodes 33A drawn in parallel to the surface direction are coupled together while being sandwiched by the connecting member 4, and all the minus electrodes 33B drawn in parallel to the surface direction are also sandwiched by the connecting member 4. It is connected in the state.
Each connecting member 4 can be formed by bending so as to sandwich each electrode 33A, 33B. Each connecting member 4 can be formed into a wave shape by bending a sheet metal, and a portion facing each electrode 33A, 33B can be formed by cutting the sheet metal.

By connecting the positive electrodes 33A by the connecting member 4 and connecting the negative electrodes 33B by the connecting member 4, the laminated cell batteries 3 can be electrically connected in parallel.
Moreover, each electrode 33A (33B) can be clamped from both surfaces using a spacer 41 provided integrally with or separately from each connecting member 4. Then, the bolts 51 are inserted into the through holes provided in the electrode 33A (33B), the connecting member 4, and the spacer 41 and tightened together with the nut 52, so that each electrode 33A (33B) can be electrically integrated.

  As shown in FIG. 7, the laminate cell battery structure 1 of this example includes a plurality of holding frames 2 constituting the connection cell set 11 of the plurality of laminate cell batteries 3, and a plurality of sheets constituting the connection cell set 11. The laminate cell batteries 3 are configured to be electrically connected in series. That is, in the laminated cell battery structure 1 of this example, the plurality of laminated cell batteries 3 constituting each connection cell set 11 are electrically connected in parallel, and each connection cell set 11 is electrically connected in series. Connected.

More specifically, the holding frames 2 constituting the two connection cell sets 11 are arranged in a state where the connection member 4 in one connection cell set 11 and the connection member 4 in the other connection cell set 11 are arranged adjacent to each other. Are laminated. And the connection member 4 in one connection cell set 11 and the connection member 4 in the other connection cell set 11 are connected by the bus bar 61A, and the two connection cell sets 11 are electrically connected in series. An arbitrary number of the connection cell groups 11 can be stacked, and a fastening member can be arranged in the concave portions provided in the left and right side frame portions 22 of each holding frame 2 and can be integrated by the fastening members.
The bus bar 61A alternately connects adjacent connection cell sets 11 on one side and the other side in the drawing direction H of the laminated cell structure 1 in which the electrodes 33A and 33B are arranged. Between the connection cell groups 11 in which the bus bar 61A does not appear on the front side, the bus bar 61A is connected on the back side.

Further, as shown in FIGS. 7 and 8, the laminated cell battery structure 1 of this example includes a plurality of holding frames 2 constituting the connection cell set 11 and a stacking direction D with respect to the plurality of stacked holding frames 2. Insulating end plates 25 provided with conductive plate terminal portions 251 are laminated from both sides. The plurality of holding frames 2 are assembled as a laminated holding frame assembly 12 by sandwiching a fastening member between the insulating end plates 25. The connection member 4 in the end holding frame 2A, which is the holding frame 2 stacked at one end in the laminated holding frame 12, and the plate terminal portion 251 in the insulating end plate 25 adjacent to the end holding frame 2A are bus bars. 61B is connected. The laminated holding frame 12 is electrically connected to the outside by the wire harness 62 from the plate terminal portion 251 to which the bus bar 61B is connected.
FIG. 8 shows a state in which the laminated holding frames 12 are arranged adjacent to each other. As shown in the figure, the holding frame 2 can be arranged adjacent to the direction of the side frame portion 22 (left-right direction W). In this case, the cooling passage 23 and the discharge passage 24 are arranged on the side frame portion 22. It can form continuously with respect to the some holding | maintenance frame 2 arrange | positioned adjacent to this direction.

As shown in FIGS. 1 and 2, in the holding frame 2 constituting the laminate cell battery structure 1 of this example, the cooling passage 23 is formed so as to allow the cooling air A to pass along the surface direction of the laminate cell battery 3. The discharge passage 24 is formed adjacent to the cooling passage 23 and in parallel with the cooling passage 23. The cooling passage 23 and the discharge passage 24 are separated by a partition wall 213 provided in the holding frame 2. Further, the cooling passage 23 is formed at the upper and lower positions in the holding frame 2, that is, the one side frame portion 21A from which the plus electrode 33A is drawn out in the holding frame 2 and the other side frame portion 21B from which the minus electrode 33B is drawn out. Yes.
Each cooling passage 23 is formed so as to penetrate in the left-right direction W of the holding frame 2, that is, in the direction of the side end portion 302 of the sheet-like container 31 in the laminated cell battery 3. The cooling passage 23 forms opening holes 230 at two positions in the left-right direction W at the upper and lower positions of the holding frame 2, that is, a total of four positions.

  As shown in FIG. 4, in the holding frame 2 of the present example, the discharge passage 24 is formed in parallel with the cooling passage 23 adjacent to the inside of the cooling passage 23 and leaks from the drawing end portion 301 of the sheet-like container 31. The first passage portion 241 that collects the gas and the second passage portion 242 that is formed orthogonal to the first passage portion 241 and collects the gas G leaking from the side end portion 302 of the sheet-like container 31 are communicated with each other. Each discharge passage 24 is formed so as to penetrate in the left-right direction W of the holding frame 2, that is, in the direction of the side end portion 302 of the sheet-like container 31 in the laminated cell battery 3. The discharge passage 24 forms opening holes 240 at two positions in the left-right direction W at the upper and lower positions of the holding frame 2, that is, a total of four positions.

FIG. 2 shows an enlarged cross section of one side frame portion 21A (the other side frame portion 21B) in the holding frame 2.
The one-side frame portion 21A and the other-side frame portion 21B of the holding frame 2 include a lamination-side outer wall 211 provided on both outer sides in the lamination direction D of the laminate cell battery 3, and a drawer-side outer located outside the drawing direction H. A wall 212 and a partition wall 213 positioned in parallel to the inside of the drawer-side outer wall 212 are provided. The cooling passage 23 is formed by being surrounded by the lamination side outer wall 211, the extraction side outer wall 212, and the partition wall 213.
In addition, a protrusion 214 that supports the laminate cell battery 3 is provided at the inner end of the laminated side outer wall 211. The first passage portion 241 of the discharge passage 24 is formed to be surrounded by the stacked side outer wall 211, the partition 213, and the protrusion 214.
The drawing-side outer wall 212 and the partition wall 213 are provided with insertion holes 215 through which the electrodes 33A and 33B of each laminated cell battery 3 are inserted.

FIG. 3 shows an enlarged cross section of the left and right side frame portions 22 in the holding frame 2.
On the side frame portion 22 of the holding frame 2, the side that holds the laminated side outer walls 221 provided on both outer sides in the laminating direction D of the laminated cell battery 3 and the side end portion 302 of the sheet-like container 31 of the laminated cell battery 3. An outer wall 222 is formed. In addition, a protrusion 223 that supports the laminate cell battery 3 is provided at the inner end of the laminated side outer wall 221. The second passage portion 242 of the discharge passage 24 is formed to be surrounded by the stacked side outer wall 221, the side outer wall 222, and the protrusion 223.
A plurality of insertion holding recesses 224 are formed side by side on the inner side surfaces of the left and right side frame portions 22 to insert and hold the side end portions 302 of the sheet-like containers 32 of the respective laminate cell batteries 3. Moreover, the outer surface in the right and left side frame part 22 is formed with a recess 225 in which a fastening member for holding the stacked state of the holding frame 2 is arranged (see FIG. 1).

  When the plurality of holding frames 2 are connected in the stacking direction D, the holding frame 2 is formed on both sides of the stacking direction D in the one side frame portion 21A, the other side frame portion 21B, and the left and right side frame portions 22. One of the pair of laminated side outer walls 211 (221) can be omitted. In this case, the cooling passage 23 and the discharge passage 24 can be formed using the stacked side outer walls 211 (221) of the adjacent holding frames 2.

The laminated cell battery structure 1 of this example holds a laminated cell battery 3 in which a plurality of laminates are stacked in a holding frame 2, a function for cooling the battery with respect to the holding frame 2, and a gas G generated when the battery is abnormal. Combined with the function of discharging.
Specifically, the cooling passage 23 allows the cooling air A to pass through the surface of the electrodes 33A and 33B of each laminate cell battery 3 in contact with the electrodes 33A and 33B of each laminate cell battery 3 to pass therethrough. 2 is formed. Thereby, the electrodes 33A and 33B that are easily heated by the heat generated by the battery can be effectively cooled.
Further, the discharge passage 24 is formed in the holding frame 2 so as to allow the gas G leaking from the drawing end portion 301 and the side end portion 302 of the sheet-like container 31 when the battery is abnormal. Thereby, when the gas G leaks from either the drawing end portion 301 or the side end portion 302 of the sheet-like container 31 when the battery is abnormal, the gas G is guided outside the passenger compartment without being mixed with the cooling air A. Can do. The laminate cell battery 3 of this example is a lithium battery, and the gas G that is generated and leaks when the battery becomes hot is carbon monoxide, carbon dioxide, or the like generated from the electrolyte.

In the laminated cell battery structure 1 of this example, the cooling passage 23 and the discharge passage 24 are formed so as to be separated by a partition wall 213. Thereby, it is possible to prevent the gas G leaked when the battery is abnormal from flowing into the cooling passage 23. The cooling air A flowing through the cooling passage 23 can be air, and the air as the cooling air A can be supplied to the vehicle interior after passing through the cooling passage 23.
On the other hand, the gas G that has flowed into the discharge passage 24 can be discharged out of the passenger compartment so as not to affect passengers in the passenger compartment.
Therefore, according to the laminated cell battery structure 1 of the present example, the simple structure prevents the mixed flow of the cooling air A for cooling the battery and the gas G that leaks when the battery is abnormal, and the battery cools and leaks when the battery is abnormal. The gas G to be processed can be appropriately performed.

  Further, as shown in FIG. 9, the opening hole 240 provided in the end portion of the discharge passage 24 with respect to the holding frame 2 is one place that opens from the end portion of the first passage portion 241 to the side end portion 302. You can also. In this case, the gas G generated when the battery is abnormal and passing through the discharge passage 24 can be concentrated in one place in the holding frame 2 and guided outside the passenger compartment.

DESCRIPTION OF SYMBOLS 1 Laminate cell battery structure 2 Holding frame 213 Partition 23 Cooling passage 24 Discharge passage 241 1st passage part 242 2nd passage part 3 Laminate cell battery 301 Draw-out edge part 302 Side edge part 31 Sheet-like container 32 Battery body 33A Positive electrode 33B Negative electrode 4 Connecting member A Cooling air G Gas

Claims (7)

A battery body is housed in a flexible sheet-like container, and a plurality of laminated cell batteries in which a pair of sheet-like electrodes are drawn from the battery body to the outside of the sheet-like container are laminated,
The laminated cell battery in which the plural sheets are laminated is held in a holding frame that holds the four sides thereof,
The holding frame has a cooling passage for allowing cooling air to pass in the vicinity of the electrode, and a discharge for allowing the gas to pass in the case where the gas leaks from a drawing end portion where the electrode is drawn out in the sheet-like container. A laminated cell battery structure characterized in that the passage is formed in isolation. The laminate cell battery structure according to claim 1, wherein the cooling passage is formed to allow cooling air to pass along a surface direction of the laminate cell battery.
The discharge passage is formed in parallel with the cooling passage adjacent to the cooling passage,
The laminated cell battery structure, wherein the cooling passage and the discharge passage are separated by a partition provided in the holding frame.   3. The laminated cell battery structure according to claim 1, wherein the cooling passage is formed so as to penetrate the holding frame in a direction of a side end portion of the sheet-like container perpendicular to the extraction end portion. A laminated cell battery structure characterized by comprising: The laminate cell battery structure according to any one of claims 1 to 3, wherein the pair of electrodes are drawn from one side of the laminate cell battery and from the other side of the laminate cell battery. Consisting of a negative electrode,
The laminated cell battery structure according to claim 1, wherein the cooling passage is formed in one side frame portion from which the plus electrode is drawn out and the other side frame portion from which the minus electrode is drawn out in the holding frame.   The laminate cell battery structure according to any one of claims 1 to 4, wherein the discharge passage is in a direction of a side end portion of the sheet-like container perpendicular to the drawer end portion with respect to the holding frame. A laminated cell battery structure characterized by being formed through.   5. The laminated cell battery structure according to claim 1, wherein the discharge passage is formed adjacent to the cooling passage in parallel with the cooling passage and collects gas leaking from the leading end portion. A first passage portion that communicates with a second passage portion that is formed perpendicular to the first passage portion and that collects gas leaking from a side end portion of the sheet-like container perpendicular to the extraction end portion. And the laminated cell battery structure characterized by opening to the said side edge part from the edge part of the said 1st channel | path part. The laminate cell battery structure according to any one of claims 1 to 6, wherein the laminate cell battery structure is for vehicle use.
The laminate cell battery structure, wherein the discharge passage communicates with the outside of the passenger compartment.

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