JP2013004402A - Secondary battery cell, secondary battery device, vehicle, electric device, and method for manufacturing secondary battery cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the rise in the temperature involved with heat generation in power supply or power charge in a secondary battery cell.SOLUTION: The secondary battery cell 1 comprises: an outer container 2; an electrode assembly 8 housed in the outer container 2; electrode terminals 4 and 5 provided on the outer container 2 and connected to the electrode assembly 8; and a radiator 9 which is surrounded by the electrode assembly 8 and placed in the outer container 2, and which has a higher thermal conductivity than the electrode assembly 8 and connects with the outer container 2.

Description

  Embodiments described herein relate generally to a secondary battery cell, a secondary battery device including a plurality of the secondary battery cells, a vehicle equipped with the secondary battery device, an electric device, and a method for manufacturing the secondary battery cell.

  In recent years, secondary battery cells have been widely used as power sources for vehicles such as electric vehicles, hybrid electric vehicles, and electric rotations, or for electric devices such as televisions. For example, lithium ion secondary battery cells, which are non-aqueous secondary battery cells, have attracted attention as power sources for electric vehicles and the like because they have high output and high energy density.

  Generally, a secondary battery cell includes an outer container made of aluminum or the like, an electrode body housed in the outer container together with an electrolyte, and an electrode terminal provided in the outer container and connected to the electrode body. ing.

  Moreover, when using a secondary battery cell as a power supply, the secondary battery apparatus which accommodated the some secondary battery cell in the case is comprised in order to achieve high capacity | capacitance and high output.

JP 2011-76936 A

  The secondary battery cell generates heat during power feeding and charging, and the temperature rises. Since such a temperature rise causes a decrease in the life of the secondary battery cell, it is required to suppress the temperature rise of the secondary battery cell during power feeding and charging.

  Embodiments of the present invention include a secondary battery cell that can suppress a temperature rise caused by heat generation during power feeding or charging, a secondary battery device including a plurality of the secondary battery cells, and the secondary battery device. Provided are a vehicle, an electric device, and a method for manufacturing a secondary battery cell.

  The secondary battery cell of the embodiment is surrounded by an outer container, an electrode body housed in the outer container, an electrode terminal provided in the outer container and connected to the electrode body, and an electrode body in the outer container And a radiator that has a higher thermal conductivity than the electrode body and is connected to the outer container.

It is a perspective view which shows the secondary battery cell which concerns on the 1st Embodiment of this invention. It is a vertical front view which shows the secondary battery cell. It is a horizontal sectional view showing the secondary battery cell. It is a perspective view which shows the secondary battery apparatus using the secondary battery cell. It is a disassembled perspective view of the secondary battery device shown by removing the top cover. It is a disassembled perspective view of the secondary battery device disassembled and shown in each case and a secondary battery cell. It is a perspective view which shows the inner surface of the upper case which is one of the cases which comprise the secondary battery apparatus. It is a top view which shows the arrangement | sequence and connection state of the secondary battery cell and bus bar in the secondary battery apparatus. It is a schematic diagram which shows the vehicle carrying the secondary battery apparatus. It is a schematic diagram which shows the television carrying the secondary battery apparatus. It is a perspective view which shows the secondary battery cell which concerns on the 2nd Embodiment of this invention. It is a vertical front view which shows the secondary battery cell. It is a horizontal sectional view showing the secondary battery cell. It is a vertical front view which shows the secondary battery cell which concerns on the 3rd Embodiment of this invention. It is a horizontal sectional view showing the secondary battery cell. It is a vertical front view which shows the modification of the secondary battery cell. It is a vertical front view which shows the secondary battery cell which concerns on the 4th Embodiment of this invention. It is a horizontal sectional view showing the secondary battery cell.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a secondary battery cell 1 according to the first embodiment. The secondary battery cell 1 is a non-aqueous electrolyte secondary battery such as a lithium ion battery, and includes a rectangular parallelepiped outer casing 2 formed of aluminum or an aluminum alloy and having a flat outer shape. The exterior container 2 is composed of a container body 2a having an open upper end and a rectangular plate-like lid body 2b welded to the upper end of the container body 2a to close the opening of the container body 2a, and is formed in a liquid-tight manner. Has been. An insulating film 3 is wound around the outer periphery of the outer container 2 except for the upper end side and the lower end side of the container body 2a. The film 3 can suppress the expansion of the outer container 2 when gas is generated in the outer container 2. Moreover, this film 3 can prevent the short circuit with the other secondary battery cell 1 arrange | positioned adjacently, and another member. Instead of winding the film 3, an insulating plate may be inserted between the secondary battery cells 1 arranged adjacent to each other.

  A pair of electrode terminals (a positive electrode terminal 4 and a negative electrode terminal 5) are provided on both end sides along the longitudinal direction of the lid body 2b, and project upward from the upper surface of the lid body 2b. The positive electrode terminal 4 is electrically connected to the lid body 2 b and has the same potential as the outer container 2. The negative electrode terminal 5 is provided through the lid body 2b, and a sealing material such as a gasket 6 made of an insulating material such as synthetic resin or glass is provided between the negative electrode terminal 5 and the lid body 2b. The gasket 6 provides a liquid-tight seal between the negative electrode terminal 5 and the lid 2b, and is electrically insulated to prevent a short circuit between the negative electrode terminal 5 and the outer container 2.

  A rectangular safety valve 7 is provided at the center of the lid 2b. The safety valve 7 is a thin portion in which a part of the lid 2b is thinned to about half, and when the gas in the outer container 2 is generated and the pressure in the outer container 2 rises to a predetermined value or more. And the pressure in the outer container 2 is lowered to prevent the outer container 2 from causing a malfunction such as rupture.

  FIG. 2 is a longitudinal front view showing the secondary battery cell 1, and FIG. 3 is a horizontal sectional view showing the secondary battery cell 1. As shown in FIGS. 2 and 3, an electrode body 8 is housed together with a non-aqueous electrolyte and a radiator 9 is provided in the outer container 2 of the secondary battery cell 1.

  The electrode body 8 is formed by winding a positive electrode sheet 8a and a negative electrode sheet 8b in a spiral shape with a separator 8c interposed therebetween. The positive electrode sheet 8 a is connected to the positive electrode terminal 4 via the positive electrode lead tab 10, and the negative electrode sheet 8 b is connected to the negative electrode terminal 5 via the negative electrode lead tab 11.

The radiator 9 is a convex member for transferring heat generated inside the secondary battery cell 1 during charging or power feeding to the outer container 2 and is formed in a flat plate shape in the present embodiment. . Regarding the shape of the radiator 9, in addition to the flat plate shape, it may be formed in various shapes such as a columnar shape, a cylindrical shape, and an elliptical cylindrical shape.

  Further, the heat dissipating body 9 is connected to the container main body 2 a by being integrally formed with the container main body 2 a formed of aluminum or an aluminum alloy, and has a higher thermal conductivity than the electrode body 8. The radiator 9 is disposed at the center of the outer casing 2, and the electrode body 8 is wound around the radiator 9 in a spiral shape.

  Further, the convex heat dissipating body 9 can be used as a core for winding the electrode body 8 in a spiral shape. In this case, it becomes easy to fix the position of the radiator 9, which leads to a reduction in manufacturing error for each secondary battery cell 1.

  In addition, although the heat radiator 9 and the container main body 2a of this embodiment are connected by being formed integrally, heat dissipation is performed by forming the heat radiator separately from the container main body 2a and then connecting it by welding, press fitting, or the like. You may connect a body and the container main body 2a. When the radiator is formed separately from the container body 2a, the radiator is preferably formed of a material having a higher thermal conductivity than the container body 2a, such as copper or carbon. By forming the radiator with copper or carbon having a higher thermal conductivity than the container body 2a, the effect of transferring the heat generated inside the secondary battery cell 1 to the outer container 2 can be enhanced.

  4 to 8 are explanatory views of the secondary battery device 12 using a plurality of the secondary battery cells 1 described above, FIG. 4 is a perspective view showing the overall appearance of the secondary battery device 12, and FIG. 6 is an exploded perspective view showing the bus bar mounting structure of the secondary battery device 12 by removing the top cover of the secondary battery device 12, and FIG. 6 is an exploded perspective view showing the secondary battery device 12 in each case and secondary battery cell 1 in an exploded manner. 7 is a perspective view showing an inner surface of an upper case which is one of cases constituting the secondary battery device 12, and FIG. 8 shows the arrangement and connection state of the secondary battery cells 1 and bus bars in the secondary battery device 12. FIG.

  As shown in FIGS. 4 to 6, the secondary battery device 12 includes a rectangular box-shaped case 13 and a plurality of, for example, 30 secondary battery cells 1 housed in the case 13. It is configured as. The case 13 includes a rectangular frame-shaped center case 14 that is open at the top and bottom, a lower case 15 that is formed in a rectangular plate shape and forms a bottom wall, and an upper case 16 that is formed in a rectangular plate shape and forms a ceiling wall. It has three division members. The lower case 15, the center case 14, and the upper case 16 are joined together in this order to form a rectangular box-like case 13. The upper surface side of the upper case 16 is covered with a rectangular plate-like top cover 17. Each component of the case 13 and the top cover 17 are each formed of an insulating synthetic resin, for example, polyphenylene ether (PPE).

  As shown in FIG. 4, a rectangular plate-like terminal base 18 made of synthetic resin is screwed to a side wall located on one end side in the longitudinal direction of the case 13, for example, the front end wall 13a. A battery monitoring board 21 for monitoring the voltage, temperature, etc. of the secondary battery cell 1 and the positive electrode output terminal 19, the negative electrode output terminal 20 of the secondary battery device 12 is attached to the terminal base 18.

  As shown in FIG. 6, the secondary battery cell 1 accommodated in the case 13 includes, for example, three secondary battery cells 1 connected in parallel to form one cell unit C, and 10 cell units C Are connected in series.

  On the inner surface of the lower case 15, as shown in FIG. 6, a number corresponding to the number of secondary battery cells 1 accommodated in the case 13, here, thirty engagement grooves 22 are formed. Each engagement groove 22 is formed in an elongated rectangular shape corresponding to the cross-sectional shape of the outer container 2 of the secondary battery cell 1, and its longitudinal direction extends along the width direction of the lower case 15. The plurality of engagement grooves 22 are provided in two rows with a predetermined interval in the longitudinal direction of the lower case 15. A center rib 23 is formed between the two rows, and the center rib 23 extends over the entire length of the lower case 15 in the longitudinal direction.

  As shown in FIG. 6, the center case 14 is formed in a rectangular frame shape, and includes a pair of side walls 14a and 14b extending in the longitudinal direction and facing each other, and a pair of side walls 14c and 14d extending in the width direction and facing each other. Have. Four partition walls 24 are formed in the center case 14. These partition walls 24 extend over the entire length of the center case 14 in the width direction, and are provided at equal intervals along the longitudinal direction of the center case 14. It is divided into two spaces. Furthermore, a support post 25 extending in the height direction of the center case 14 is formed at the central portion of each partition wall 24 and the central portions of the side walls 14c and 14d. Each space in the center case 14 is divided into two left and right accommodation chambers 26 by support posts 25. Thereby, in the center case 14, ten storage chambers 26 each capable of storing one cell unit C are formed in two rows.

  As shown in FIGS. 5 and 6, a plurality of ventilation holes 27 are formed in the two side walls 14 a and 14 b extending in the longitudinal direction of the center case 14. For example, four vent holes 27 are formed corresponding to one storage chamber 26, each of which is vertically connected to the storage chamber 26. Cooling air can be ventilated into the case 13 through these vent holes 27.

  On the inner surface side of the upper case 16, as shown in FIG. 7, a number corresponding to the number of secondary battery cells 1 accommodated in the case 13, here, thirty engagement grooves 28 are formed. Each engagement groove 28 is formed in an elongated rectangular shape corresponding to the cross-sectional shape of the exterior container 2 of the secondary battery cell 1, and its longitudinal direction extends along the width direction of the upper case 16. The plurality of engaging grooves 28 are provided in two rows with a predetermined interval in the longitudinal direction of the upper case 16. A center rib 29 is formed between the two rows, and the center rib 29 extends over the entire length of the upper case 16 in the longitudinal direction.

  In the upper case 16, rectangular through holes 30 and 31 corresponding to the electrode terminals (the positive terminal 4 and the negative terminal 5) of the secondary battery cell 1 are formed at the bottom of each engaging groove 28. An exhaust hole 32 facing the safety valve 7 of the secondary battery cell 1 is formed. The through holes 30 and 31 are located at both ends of the engagement groove 28, and the exhaust hole 32 is located in the middle between the through holes 30 and 31. In the present embodiment, the positive electrode terminal 4 of the secondary battery cell 1 is formed to be larger than the negative electrode terminal 5, and the corresponding through hole 30 for inserting the positive electrode terminal 4 corresponds to the negative electrode terminal 5. It is formed larger than the through hole 31 to be inserted.

  The upper case 16 configured as described above is screwed to the upper surface side of the center case 14 and fixed to the center case 14, and constitutes the ceiling wall of the case 13. The lower case 15 is screwed to the lower surface side of the center case 14 and is fixed to the center case 14, and constitutes the bottom wall of the case 13.

As shown in FIG. 6, the secondary battery cell 1 is accommodated in each accommodation chamber 26 of the case 13 for each cell unit C. The lower end portion of each secondary battery cell 1 is fitted into the engagement groove 22 of the lower case 15 and is fixed to the lower case 15 with an adhesive or the like. The upper end portion of each secondary battery cell 1, that is, the end portion where the electrode terminals (the positive electrode terminal 4 and the negative electrode terminal 5) are provided is fitted into the engagement groove 28 of the upper case 16, and is bonded to the upper portion by an adhesive or the like. It is fixed to the case 16. A partition wall 24 of the center case 14 is sandwiched between two cell units C adjacent in the column direction to prevent a short circuit between the cell units C. In addition, a center rib 23 of the lower case 15, a center rib 29 of the upper case 16, and a support post 25 of the center case 14 are sandwiched between the cell units C in one row and the cell units C in the other row. A short circuit between the units C is prevented.

  When the positions of the respective secondary battery cells 1 are determined by fitting into the engagement grooves 22 and 28 in this way, the adjacent secondary battery cells 1 are connected to the main surfaces of the outer packaging container 2, that is, the outer packaging container 2. The wide surfaces are arranged in parallel with each other with a predetermined gap. Adjacent cell units C are also arranged facing each other in parallel with a predetermined gap. And the row | line | column of the some secondary battery cell 1 arranged in parallel with such a clearance gap is arrange | positioned in parallel with 2 rows.

  Both side walls 14a and 14b of the center case 14 are opposed to the side surfaces of the secondary battery cells 1 arranged in two rows with a slight gap. In each row of secondary battery cells 1, the gaps between adjacent secondary battery cells 1 are opposed to the air holes 27 formed in the side walls 14 a and 14 b of the center case 14. Thereby, the air holes 27 formed in the side wall 14a, the gaps between the secondary battery cells 1, and the air holes 27 formed in the side wall 14b are aligned and arranged. The outside air or cooling air that has flowed into the center case 14 from one vent hole 27 passes through the gap between the secondary battery cells 1, cools the secondary battery cell 1, and then is exhausted from the other vent hole 27.

  The positive electrode terminal 4 and the negative electrode terminal 5 of the secondary battery cell 1 are inserted through the through holes 30 and 31, respectively, and protrude to the upper surface side of the upper case 16. The safety valve 7 of the secondary battery cell 1 is positioned to face the exhaust hole 32 of the upper case 16.

  A plurality of bus bars, which will be described later, are provided on the upper surface side of the upper case 16, and the plurality of secondary battery cells 1 in the cell unit C are connected in parallel by these bus bars, and the plurality of cell units C are connected in series. It is connected to the. Specifically, as shown in FIG. 5, the upper surface of the upper case 16 is formed one step lower, and a peripheral wall 16 a is erected along the periphery of the upper surface. A center rib 33 is formed on the upper surface of the upper case 16 at the center in the width direction, and the center rib 33 extends from one end side to the other end side in the longitudinal direction of the upper case 16. On the upper surface of the upper case 16, a pair of partition walls 34 and 35 are erected on both sides of the center rib 33. The pair of partition walls 34 are located on both sides of each exhaust hole 32 formed in the upper case 16, and extend in parallel with each other from one end side to the other end side along the longitudinal direction of the upper case 16. Similarly, the pair of partition walls 35 are located on both sides of each exhaust hole 32 formed in the upper case 16, and extend in parallel from one end side to the other end side along the longitudinal direction of the upper case 16. . The center rib 33, the partition walls 34 and 35, and the peripheral wall 16a are formed at substantially the same height.

  Further, on the upper surface side of the upper case 16, respectively, between the peripheral wall 16 a and the partition wall 34, between the peripheral wall 16 a and the partition wall 35, between the center rib 33 and the partition wall 34, and between the center rib 33 and the partition wall 35, respectively. A plurality of partition walls 36 are erected between the two. The partition wall 36 is formed at substantially the same height as the peripheral wall 16a. By the peripheral wall 16a, the center rib 33, the partition walls 34 and 35, and the partition wall 36, a plurality of bus bar mounting chambers 37a, 37b, 37c, 38a, 38b, 39, 40a, 40b, and 41a are provided on the upper surface side of the upper case 16. , 41b, 41c are partitioned.

As shown in FIGS. 5 and 6, a plurality of bus bar mounting chambers formed in the upper case 16 are mounted with bus bars that are connection fittings for electrically connecting the secondary battery cells 1. The battery cell 1 is connected to the electrode terminals (the positive terminal 4 and the negative terminal 5). In this embodiment, four types of bus bars are used. That is, the positive electrode bus bar 42 which connects the positive terminals 4 of the three secondary battery cells 1 in one cell unit C and has a positive output end 42a bent in a crank shape at one end, and another one cell The negative electrode bus bar 43 which connects the negative electrode terminals 5 of the three secondary battery cells 1 in the unit C and has a negative electrode side output end portion 43a bent at one end in a crank shape, each of the electrodes of the six secondary battery cells 1 Eight common bus bars 44 for connecting terminals (positive terminal 4 and negative terminal 5) and a bus bar unit 45 in which three bus bars are connected are provided. The bus bars 42, 43, 44 and the bus bar unit 45 are formed by bending a metal plate made of a conductive material such as aluminum.

  As schematically shown in FIG. 8, the plurality of bus bars 42, 43, 44 and the bus bar unit 45 described above connect three secondary battery cells 1 of each cell unit C in parallel, and 10 cells. Units C are connected in series with each other. The positive electrode output terminal 19 and the negative electrode output terminal 20 are provided on the same wall surface of the case 13, that is, on the front end wall 13 a side, and the ten cell units C are U-shaped from the positive electrode output terminal 19 to the negative electrode output terminal 20. Connected side by side.

  Returning to FIG. 5, an elongated rectangular blocking plate 46 a is fixed on the pair of partition walls 34 erected on the upper surface of the upper case 16, and the blocking plate 46 a has a total length in the longitudinal direction of the upper case 16. It extends over. The space between the partition walls 34 is closed by the closing plate 46a, and the exhaust passage 47a extending over the entire length of the upper case 16 in the longitudinal direction is formed by this space. The exhaust holes 32 formed in the upper case 16 and arranged in a row communicate with the exhaust passage 47a.

  Similarly, on the pair of partition walls 35 erected on the upper surface of the upper case 16, an elongated rectangular closing plate 46 b is fixed, and the closing plate 46 b extends over the entire length of the upper case 16 in the longitudinal direction. ing. The closing plate 46 b closes the space between the partition walls 35, and an exhaust passage (not shown) extending over the entire length of the upper case 16 is formed by this space, and is formed in the upper case 16. The exhaust holes 32 arranged in a row communicate with the exhaust passage.

  A flexible wiring board (hereinafter referred to as FPC) 48 for measuring the voltage and temperature of the secondary battery cell 1 is affixed to the upper surfaces of the blocking plates 46a and 46b. Each FPC 48 is formed in a strip shape having a width substantially equal to that of the blocking plates 46a and 46b, and extends over substantially the entire length of the upper case 16 in the longitudinal direction. A connector 49 is mounted on the end of the FPC 48 on the front end wall 13a side.

  A plurality of harnesses 50 extend from the connector 49 of the FPC 48, and a connector 51 is connected to the extended ends of these harnesses 50. The two connectors 51 are connected to the battery monitoring board 21.

  FIG. 9 shows an electric vehicle 52 equipped with the secondary battery device 12. A motor 54 is connected to the drive wheel 53 of the vehicle 52 as a drive unit, and power is supplied to the motor 54 from the secondary battery device 12. A plurality of secondary battery devices 12 are mounted on the vehicle 52, and the plurality of mounted secondary battery devices 12 are connected in series.

  FIG. 10 shows a television 55 which is an electric device in which the secondary battery device 12 is mounted as a power source. As a power source of the television 55, it is desirable to include a switching mechanism that can use the secondary battery device 12 and a commercial power source.

  In such a configuration, the secondary battery cell 1 of the present embodiment is provided with a radiator 9 having a higher thermal conductivity than the electrode body 8 in the exterior container 2, and the radiator 9 is connected to the exterior container 2. It is connected to the exterior container 2 by being formed integrally. For this reason, when the secondary battery cell 1 generates heat during charging or power feeding, the heat inside the secondary battery cell 1 is easily transmitted to the exterior container 2 via the radiator 9 and is easily radiated from the surface of the exterior container 2. . And since the heat radiator 9 is arrange | positioned in the center part of the exterior container 2, the heat-transfer effect from the inside of the secondary battery cell 1 to the exterior container 2 can be raised. Therefore, the secondary battery cell 1 is less likely to have heat inside, and can suppress a temperature increase due to heat being stored inside. The life of the battery cell 1 can be extended.

  When the secondary battery cell 1 is accommodated in the case 13 of the secondary battery device 12, the secondary battery is caused by the air flowing around the secondary battery cell 1 through the vent hole 27 formed in the center case 14. The cooling performance of the cell 1 can be improved.

Further, when the secondary battery device 12 in which the secondary battery cell 1 is housed in the case 13 is mounted on the vehicle 52 or the television 55 and used as a power source, the temperature rise of the secondary battery cell 1 is suppressed. The lifetime of the secondary battery cell 1 and the secondary battery device 12 can be extended.
(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. Note that, in the second embodiment and other embodiments, the same components as those of the previously described embodiments are denoted by the same reference numerals, and redundant descriptions are omitted.

  The basic configuration of the secondary battery cell 61 of the second embodiment is the same as that of the secondary battery cell 1 of the first embodiment, and the difference between these secondary battery cells 1 and 61 is that of the outer container. The outer shape.

  Whereas the secondary battery cell 1 of the first embodiment includes a rectangular parallelepiped outer casing 2, the secondary battery cell 61 of the second embodiment has a cylindrical outer shape as shown in FIG. A shaped outer container 62 is provided. The outer container 62 is made of aluminum or an aluminum alloy, like the outer container 2. As shown in FIG. 12, the exterior container 62 is fixed to a container main body 62a having an open upper end, a sealing plate 64 caulked to the upper end portion of the container main body 62a via an insulating gasket 63, and the sealing plate 64. The positive electrode terminal 65 is formed in a liquid-tight manner. In the secondary battery cell 61, the container body 62a also serves as a negative electrode terminal.

  A hole 66 is formed in the center of the sealing plate 64, and a rubber safety valve 67 is provided between the sealing plate 64 and the positive terminal 65 to cover the hole 66. A plurality of vent holes 68 are formed in the positive terminal 65. An insulating film 69 is wound around the outer periphery of the container main body 62a. The film 69 can suppress the expansion of the exterior container 62 when gas is generated in the exterior container 62. Moreover, this film 69 can prevent a short circuit with other secondary battery cells 61 and other members disposed adjacent to each other. Instead of winding this film 69, an insulating plate may be inserted between the adjacent secondary battery cells 61.

  As shown in FIGS. 12 and 13, the outer container 62 houses the electrode body 8 together with the non-aqueous electrolyte and a radiator 70.

  The electrode body 8 is formed by winding a positive electrode sheet 8a and a negative electrode sheet 8b in a spiral shape with a separator 8c interposed therebetween. The positive electrode sheet 8a is connected to the positive electrode terminal 65 through the positive electrode lead tab 71 and the sealing plate 64, and the negative electrode sheet 8b is in contact with the container body 62a that functions as a negative electrode terminal.

  The radiator 70 is a convex member for transferring the internal heat generated in the secondary battery cell 61 to the exterior container 62 during charging or power feeding, and is formed in a round bar shape in this embodiment. Furthermore, the heat radiating body 70 is connected to the container main body 62 a by being formed integrally with the container main body 62 a formed of aluminum or an aluminum alloy, and has a higher thermal conductivity than the electrode body 8. The radiator 70 is disposed at the center of the outer container 62, and the electrode body 8 is wound around the radiator 70 in a spiral shape.

  In addition, although the heat radiating body 70 and the container main body 62a of this embodiment are connected by being formed integrally, the heat radiating body is formed separately from the container main body 62a, and then connected to the container main body 62a by welding, press fitting, or the like. By doing so, the radiator and the container main body 62a may be connected. When the radiator is formed separately from the container body 62a, the radiator is preferably formed of a material having higher thermal conductivity than the container body 62a, for example, copper or carbon. By forming the radiator with copper or carbon having a higher thermal conductivity than the container body 62a, the effect of transferring the heat generated inside the secondary battery cell 1 to the outer container 2 can be enhanced.

  In such a configuration, the secondary battery cell 61 is provided with a heat radiating body 70 having a higher thermal conductivity than the electrode body 8 inside the outer casing 62, and the heat radiating body 70 is formed integrally with the outer casing 62. As a result, the outer container 62 is connected. For this reason, when the secondary battery cell 61 generates heat during charging or power feeding, the heat inside the secondary battery cell 61 is easily transmitted to the exterior container 62 via the radiator 70 and is easily radiated from the surface of the exterior container 62. . In addition, since the heat radiating body 70 is disposed at the center of the outer casing 62, the heat transfer effect from the inside of the secondary battery cell 61 to the outer casing 62 can be increased. Therefore, the secondary battery cell 1 is less likely to have heat inside, and can suppress a temperature increase due to heat being stored inside. The life of the battery cell 1 can be extended.

A plurality of secondary battery cells 61 are accommodated in a case to constitute a secondary battery device, and the secondary battery device can be mounted on a vehicle or an electric device and used as a power source. In that case, the temperature rise of each secondary battery cell 61 can be suppressed by the action of the radiator 70, and the life of the secondary battery cell 61 and the secondary battery device using the secondary battery cell 61 is extended. be able to.
(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS. The basic configuration of the secondary battery cell 81 of the third embodiment is the same as that of the secondary battery cell 1 described in the first embodiment, and has a rectangular parallelepiped-shaped outer container 2. The electrode body 8 is accommodated. Further, a convex heat radiating body 82 which is formed integrally with the outer container 2 and connected to the outer container 2 is disposed at the center of the outer container 2.

  The difference between the secondary battery cell 81 of the third embodiment and the secondary battery cell 1 of the first embodiment is that the radiator 9 of the first embodiment is plate-shaped, whereas The heat dissipating body 82 of the embodiment is that a hollow portion 83 communicating with the external space of the outer container 2 is formed inside.

  The thickness of the radiator 82 in which the hollow portion 83 is formed is formed thinner than the thickness of the container body 2a, and the strength of the radiator 82 is such that when the pressure in the outer container 2 rises, the radiator 82 Is set to a strength that deforms before the outer container 2.

In such a configuration, the secondary battery cell 81 is provided with a heat radiating body 82 having a higher thermal conductivity than the electrode body 8 inside the outer casing 2, and the heat radiating body 82 is formed integrally with the outer casing 2. As a result, the outer container 2 is connected. For this reason, when the secondary battery cell 81 generates heat during charging or power feeding, the heat inside the secondary battery cell 81 is easily transmitted to the exterior container 2 via the radiator 82 and is easily radiated from the surface of the exterior container 2. . Moreover, since the heat radiating body 82 is disposed at the center of the outer casing 2, the heat transfer effect from the inside of the secondary battery cell 81 to the outer casing 2 can be increased. Therefore, the secondary battery cell 81 is less likely to have heat inside, and can suppress a temperature increase due to heat being stored inside. The life of the battery cell 81 can be extended.

  Further, since the hollow portion 83 is formed inside the heat radiating body 82, the heat radiating area from the heat radiating body 82 is widened, and the heat radiating effect by the heat radiating body 82 can be enhanced. Thereby, the temperature rise of the secondary battery cell 81 can be further suppressed.

  Further, the thickness of the radiator 82 is formed to be thinner than the thickness of the container body 2a, and the strength of the radiator 82 is such that the radiator 82 is deformed earlier than the outer container 2 when the pressure in the outer container 2 increases. It is set to strength. For this reason, when gas is generated inside the secondary battery cell 81 and the pressure in the secondary battery cell 81 increases, the hollow portion 83 is compressed before the outer container 2 expands outward, and the secondary battery cell The outward expansion of 81 is suppressed. Thereby, when the secondary battery cell 81 is expanded by a certain amount outward, which is one of the durability standards, the durability of the secondary battery cell 81 can be improved.

  Further, since the secondary battery cell 81 is restrained from outward expansion when gas is generated inside, when the secondary battery device is configured by arranging a plurality of secondary battery cells 81, gas generation inside Therefore, the gap dimension between adjacent secondary battery cells 81 set in consideration of the outward expansion of the secondary battery cell 81 can be reduced. Thereby, in the secondary battery device in which the number of secondary battery cells 81 used is the same, the external dimensions of the secondary battery device can be reduced.

As shown in FIG. 16, the heat transfer member 84 having a higher thermal conductivity than air, for example, a cooling gel or rubber, may be filled in the hollow portion 83 of the radiator 82. By filling such a heat transfer member 84, the heat dissipation performed by transferring heat to the air in the hollow portion 83 can be further enhanced.
(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. The basic configuration of the secondary battery cell 91 of the fourth embodiment is the same as that of the secondary battery cell 61 of the second embodiment, has a cylindrical outer container 62, and an electrode body in the outer container 62. 8 is stored. Further, a convex heat radiating body 92 that is formed integrally with the exterior container 62 and connected to the exterior container 62 is disposed at the center of the exterior container 62.

  The difference between the secondary battery cell 91 of the fourth embodiment and the secondary battery cell 61 of the second embodiment is that the radiator 70 of the second embodiment has a round bar shape, The heat dissipating body 92 according to the embodiment is formed with a hollow portion 93 communicating with the outer space of the outer container 62 inside.

  The thickness of the radiator 92 in which the hollow portion 93 is formed is thinner than the thickness of the container main body 62a. The strength of the radiator 92 is such that when the pressure in the outer container 62 rises, the radiator 92 Is set to a strength that deforms before the outer container 62.

In such a configuration, the secondary battery cell 91 is provided with a radiator 92 having a higher thermal conductivity than the electrode body 8 inside the outer container 62, and the radiator 92 is formed integrally with the outer container 62. As a result, the outer container 62 is connected. For this reason, when the secondary battery cell 91 generates heat during charging or power feeding, the heat inside the secondary battery cell 91 is easily transmitted to the outer container 62 through the radiator 92 and is easily radiated from the surface of the outer container 62. . In addition, since the heat radiating body 92 is disposed at the center of the outer casing 62, the heat transfer effect from the inside of the secondary battery cell 91 to the outer casing 62 can be increased. Therefore, the secondary battery cell 91 is less likely to have heat inside, and can suppress a temperature increase due to heat being stored inside. The lifetime of the battery cell 91 can be extended.

  Furthermore, since the hollow part 93 is formed in the inside of the heat radiator 92, the heat radiation area from the heat radiator 92 becomes wide, and the heat radiation effect by the heat radiator 92 can be enhanced. Thereby, the temperature rise of the secondary battery cell 91 can be suppressed further.

  Further, the thickness of the radiator 92 is formed to be thinner than the thickness of the container body 62 a, and the strength of the radiator 92 is such that the radiator 92 is deformed before the outer container 62 when the pressure in the outer container 62 increases. It is set to strength. For this reason, when gas is generated inside the secondary battery cell 91 and the pressure in the secondary battery cell 91 rises, the hollow portion 93 is compressed before the outer container 62 expands outward, and the secondary battery cell The outward expansion of 91 is suppressed. Thereby, in the case where one of the durability standards is that the secondary battery cell 91 expands by a certain amount outward, the durability of the secondary battery cell 91 can be improved.

  Furthermore, since this secondary battery cell 91 suppresses outward expansion when gas is generated inside, when the secondary battery device is configured by arranging a plurality of secondary battery cells 91, gas generation inside Therefore, the gap dimension between adjacent secondary battery cells 91 set in consideration of the outward expansion of the secondary battery cell 91 associated with can be reduced. Thereby, in the secondary battery device in which the number of secondary battery cells 91 to be used is the same, the external dimensions of the secondary battery device can be reduced.

  As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. For example, the secondary battery cell may be provided with a PTC element used for temperature control. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Secondary battery cell, 2 ... Exterior container, 4 ... Positive electrode terminal (electrode terminal), 5 ... Negative electrode terminal (electrode terminal), 8 ... Electrode body, 9 ... Radiator, 12 ... Secondary battery device, 13 ... Case , 52 ... Vehicle, 55 ... Electrical equipment, 61 ... Secondary battery cell, 62 ... Exterior container, 62a ... Container body (electrode terminal), 65 ... Positive electrode terminal (electrode terminal), 70 ... Radiator, 81 ... Secondary battery Cell, 82 ... radiator, 83 ... hollow part, 84 ... heat transfer member, 91 ... secondary battery cell, 92 ... radiator, 93 ... hollow part

Claims (13)

An outer container,
An electrode body housed in the outer container;
An electrode terminal provided in the outer container and connected to the electrode body;
A heat dissipating body disposed in the outer container surrounded by the electrode body, having a higher thermal conductivity than the electrode body and connected to the outer container,
A secondary battery cell comprising: An outer container,
An electrode body housed in the outer container;
An electrode terminal provided in the outer container and connected to the electrode body;
A hollow portion is formed in the outer container, surrounded by the electrode body, has a higher thermal conductivity than the electrode body, is connected to the outer container, and communicates with the outer space of the outer container. A radiator,
A secondary battery cell comprising:   3. The secondary battery cell according to claim 2, wherein the thickness of the heat radiating body is formed to be thinner than the thickness of the outer packaging container, and the heat radiating body is deformed before the outer packaging container when the pressure in the outer packaging container increases. .   The secondary battery cell of Claim 2 or 3 with which the heat transfer member whose heat conductivity is higher than air is filled in the hollow part of the said heat radiating body.   The secondary battery cell according to any one of claims 1 to 4, wherein the heat radiating body is disposed in a central portion of the outer casing.   The secondary battery cell according to claim 1, wherein the heat radiating body is formed integrally with the exterior container.   The secondary battery cell according to any one of claims 1 to 5, wherein the heat dissipating body is formed separately from a material having a higher thermal conductivity than the outer container and is connected to the outer container.   The secondary battery cell according to any one of claims 1 to 7, wherein the outer container has an outer shape formed in a rectangular parallelepiped shape.   The secondary battery cell according to any one of claims 1 to 7, wherein the outer container has an outer shape formed in a cylindrical shape. A plurality of secondary battery cells according to any one of claims 1 to 9,
A case for accommodating a plurality of the secondary battery cells;
A secondary battery device comprising:   A vehicle equipped with the secondary battery device according to claim 10.   An electric device equipped with the secondary battery device according to claim 10. A method for manufacturing a secondary battery device comprising: an outer container; an electrode body housed in the outer container; and an electrode terminal provided in the outer container and connected to the electrode body,
A method of manufacturing a secondary battery cell, wherein the electrode body is wound around a convex heat sink formed in the outer container in a spiral shape.

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