JP2013101773A - Secondary battery, temperature adjustment structure of secondary battery, and vehicle equipped with secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently conduct temperature control in layers of an electrode body.SOLUTION: A heat transfer member 40, contacting with a first side wall 21b and a second side wall 21c which are peripheral walls of a case 20, is disposed between layers of an electrode body 11 through first and second insulation members.

Description

  The present invention relates to a secondary battery including an electrode body formed by insulating a positive electrode plate and a negative electrode plate and forming them in layers, a temperature adjustment structure of the secondary battery, and a vehicle equipped with the secondary battery. .

  2. Description of the Related Art Generally, a secondary battery having an electrode body formed by interposing a strip-shaped separator between a strip-shaped positive electrode plate and a strip-shaped negative electrode plate and winding them in a spiral shape is known. . Specifically, the positive electrode plate and the negative electrode plate are formed with a coated portion where the active material is applied and an uncoated portion where the active material is not applied. The positive electrode plate and the negative electrode plate are stacked while being shifted in the width direction through the separator, and the uncoated portions of the positive electrode plate and the negative electrode plate are respectively swirled in a state of protruding outward from both end edges of the separator. Be beaten. Current collecting terminals are connected to uncoated portions of the positive electrode plate and the negative electrode plate, respectively. And the secondary battery is comprised by accommodating the electrode body to which each current collecting terminal was connected with electrolyte solution in the case made from metal (for example, aluminum).

  By the way, such a secondary battery has a problem that the performance of the secondary battery is deteriorated as heat is generated by charging and discharging. Also, depending on the secondary battery, if the environmental temperature is low, the charge / discharge performance is lowered. Therefore, in a low temperature environment such as winter, it is necessary to heat the secondary battery particularly at the time of startup. Since the outside of the electrode body layer is accommodated in the case in close contact with the inner surface of the case, for example, the heat medium supplied toward the case and the outside of the electrode body layer are heat-exchanged via the case. Thus, the temperature of the outside of the electrode body layer is adjusted. However, both ends of the electrode body in the winding axis direction are separated from the inner surface of the case because it is necessary to secure an arrangement space for each current collecting terminal. For this reason, the electrode body has a problem that heat exchange with the heat medium is difficult to be performed from the outside to the inside of the layer, and temperature adjustment is difficult in the inside of the electrode body layer.

  Therefore, in the secondary battery of Patent Document 1, a heat radiating plate is disposed inside the electrode body layer. The heat radiation plate adjusts the temperature inside the electrode body layer (in Patent Document 1, mainly cooling the inside of the electrode body layer).

JP 2010-55887 A

However, there is a demand for more efficient temperature control inside the electrode body layer than the secondary battery of Patent Document 1.
The present invention has been made in order to solve the above-described problems, and its purpose is to provide a secondary battery capable of efficiently adjusting the temperature inside the electrode body layer, a temperature adjustment structure of the secondary battery, And it is providing the vehicle carrying a secondary battery.

  In order to achieve the above object, the invention described in claim 1 includes an electrode body formed by insulating the positive electrode plate and the negative electrode plate and forming them in layers, and the positive electrode terminal and the negative electrode terminal are externally provided. A secondary battery in which the electrode body is housed in a metal case projecting toward the end, and the positive electrode terminal and the negative electrode terminal are erected from the periphery of the terminal wall of the case in which the positive electrode terminal and the negative electrode terminal project. The gist is that a metal heat transfer member that contacts at least one of the peripheral walls is disposed between the layers of the electrode body via an insulating member.

  According to this invention, compared with the case where the heat transfer member is not in contact with the peripheral wall of the case, the heat medium supplied toward the case and the inside of the electrode body layer are interposed via the case and the heat transfer member. Heat exchange. As a result, while the insulation between the electrode body and the heat transfer member is ensured by the insulating member, the temperature inside the electrode body layer can be adjusted efficiently.

The gist of the invention described in claim 2 is that, in the invention described in claim 1, the insulating member is made of a ceramic having a thermal conductivity of 25.0 W / m · K or more.
According to this invention, since the insulating member is formed of ceramics having a thermal conductivity of 25.0 W / m · K or more, the insulating member ensures the insulation between the electrode body and the heat transfer member, but the case In addition, heat exchange between the inside of the electrode body layer and the heat medium via the heat transfer member can be performed more efficiently.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the positive electrode plate and the negative electrode plate are coated with an active material and an active material. Uncoated portions, and the uncoated portions of the positive electrode plate and the negative electrode plate project toward the opposite sides toward the peripheral wall of the case, and the uncoated portions of the positive electrode plate and the negative electrode plate A current collector terminal is connected to each of the coating portions, and a slit is formed in the current collector terminal, and at least a part of the heat transfer member is insulated between the heat transfer member and the current collector terminal. It is a gist that it is inserted into the slit in a state in which is secured.

  According to this invention, compared with the case where the heat transfer member is in contact with the peripheral wall of the case so as to avoid the current collecting terminal, the contact area between the heat transfer member and the peripheral wall of the case can be increased. As a result, heat exchange between the inside of the electrode body layer and the heat medium via the case and the heat transfer member can be performed more efficiently.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the heat transfer member is a metal plate, the insulating member is a ceramic plate, and the ceramic plate is on both sides of the metal plate. The gist is that it is fixed so as to cover.

According to this invention, the heat transfer member and the insulating member can be easily integrated.
The invention according to claim 5 is summarized in that, in the invention according to any one of claims 2 to 4, the heat transfer member is made of aluminum and the insulating member is aluminum nitride. .

According to this invention, the thermal conductivity of the heat transfer member and the insulating member can be improved.
A sixth aspect of the present invention is the temperature control structure for a secondary battery according to any one of the first to fifth aspects, wherein a heat medium flow path is formed outside the peripheral wall of the case. It is a summary.

  According to this invention, since the heat medium flow path is formed outside the peripheral wall of the case in contact with the heat transfer member, the heat medium flowing through the heat medium flow path and the inside of the electrode body layer are And heat exchange is efficiently performed through the heat transfer member.

  As described in claim 7, the vehicle may be equipped with the secondary battery according to any one of claims 1 to 5.

  According to the present invention, the temperature inside the electrode body layer can be adjusted efficiently.

The longitudinal cross-sectional view of the secondary battery in embodiment. The perspective view which shows a case main body. The perspective view which expands and shows a part of electrode body. The perspective view which shows the state by which the heat-transfer member was arrange | positioned inside the layer of the electrode body. Sectional drawing of a heat-transfer member. The perspective view which shows the state by which the heat-transfer member was inserted in the slit of the current collection terminal. The longitudinal cross-sectional view which shows the state which has accommodated the electrode body in the case main body. The figure which shows a temperature control structure typically. The longitudinal cross-sectional view of the secondary battery in another embodiment. The longitudinal cross-sectional view of the secondary battery in another embodiment. The cross-sectional view of the secondary battery in another embodiment.

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. The secondary battery is mounted on a plug-in hybrid vehicle as a vehicle and used to drive a travel motor.

  As shown in FIG. 1, the secondary battery 10 includes an electrode body 11 and a case 20 made of metal (in this embodiment, made of aluminum) that houses the electrode body 11. The case 20 includes a case main body 21 having a bottomed rectangular box shape with one surface opened, and a rectangular plate-shaped lid 22 that closes the opening of the case main body 21 and forms a part of the peripheral wall of the case 20. Yes. An electrolyte is injected into the case 20. The lid 22 has a positive terminal 22a and a negative terminal 22b projecting outward. That is, the lid 22 corresponds to the terminal wall of the case 20.

  As shown in FIG. 2, the case body 21 includes a rectangular plate-shaped bottom wall 21 a that forms a peripheral wall of the case 20, and rectangular plate-shaped first to fourth side walls 21 b that are erected on the periphery of the bottom wall 21 a, 21c, 21d, and 21e. The first side wall 21b and the second side wall 21c are formed so as to extend in parallel with each other in the short direction of the case 20, and the third side wall 21d and the fourth side wall 21e extend in parallel with each other in the longitudinal direction of the case 20. It is formed as follows.

  As shown in FIG. 3, the electrode body 11 has a strip-shaped separator 14 interposed between a strip-shaped positive electrode plate 12 and a strip-shaped negative electrode plate 13, and these are wound around the winding axis L in a spiral manner. Configured. The positive electrode plate 12 is made of aluminum, and the negative electrode plate 13 is made of copper. The positive electrode plate 12 and the negative electrode plate 13 are formed with coated portions 12a and 13a to which an active material is applied and uncoated portions 12b and 13b to which no active material is applied. The positive electrode plate 12 and the negative electrode plate 13 are stacked while being shifted in the width direction via the separator 14, and uncoated portions 12 b and 13 b of the positive electrode plate 12 and the negative electrode plate 13 are separated from both end edges 14 a and 14 b of the separator 14. Each is wound around the winding axis L in a swirled manner in a state of protruding outward. That is, the electrode body 11 of the present embodiment is a wound electrode body 11 formed by winding a continuous structure of the positive electrode plate 12, the negative electrode plate 13, and the separator 14 in layers.

  As shown in FIG. 4, the inner side of the innermost layer of the electrode body 11 (between the innermost layers among the layers of the electrode body 11 stacked in the minor axis direction of the electrode body 11). ) Is provided with a heat transfer member 40. Here, the “layer” of the electrode body 11 is composed of the positive electrode plate 12, the negative electrode plate 13, and the separator 14. The heat transfer member 40 is made of metal (in this embodiment, made of aluminum) and has a rectangular flat plate shape. As shown in FIG. 1, the length R of the heat transfer member 40 in the longitudinal direction is slightly longer than the distance between the inner surface of the first side wall 21 b and the inner surface of the second side wall 21 c of the case body 21. .

  As shown in FIG. 5, a first insulating member 41 as an insulating member is fixed to the surface 40 a of the heat transfer member 40 so as to cover the entire surface 40 a of the heat transfer member 40. Further, a second insulating member 42 as an insulating member is fixed to the back surface 40 b of the heat transfer member 40 so as to cover the entire back surface 40 b of the heat transfer member 40. The first insulating member 41 and the second insulating member 42 have a rectangular flat plate shape and are made of ceramics. In the present embodiment, the first insulating member 41 and the second insulating member 42 are made of aluminum nitride having high thermal conductivity and high electrical insulation among ceramics. Here, the ceramic having a thermal conductivity of 25.0 W / m · K or more is a ceramic having a high thermal conductivity, and the thermal conductivity of aluminum nitride is 160.0 W / m · K. In FIG. 5, the thicknesses (thickness ratios) of the heat transfer member 40, the first insulating member 41, and the second insulating member 42 are exaggerated.

  As shown in FIG. 4, in the heat transfer member 40, the space in which the heat transfer member 40 can be inserted is the most in the layer of the electrode body 11 while the positive electrode plate 12, the negative electrode plate 13, and the separator 14 are compressed from both sides in the radial direction. In a state of being formed inside the inner layer, the electrode body 11 is inserted inside the innermost layer. At this time, insulation between the heat transfer member 40 and the electrode body 11 is ensured by the first and second insulating members 41 and 42. In addition, insulating sheets (not shown) are attached to both side surfaces 40 c and 40 d that extend in the longitudinal direction of the heat transfer member 40 and connect the front surface 40 a and the back surface 40 b of the heat transfer member 40, and both side surfaces of the heat transfer member 40. Insulation between 40c, 40d and the electrode body 11 is ensured.

  Further, in a state where the heat transfer member 40 is inserted inside the innermost layer of the electrode body 11, the positive electrode plate 12, the negative electrode plate 13 and the separator 14 are further compressed from both sides in the radial direction to form a flat shape. An electrode body 11 is formed. At this time, the first and second insulating members 41 and 42 are in close contact with and thermally bonded to the innermost layer of the electrode body 11. Further, both end portions 401 and 402 in the longitudinal direction of the heat transfer member 40 protrude from both end portions in the winding axis L direction of the electrode body 11.

  As shown in FIG. 1, current collecting terminals 31 are joined to the uncoated portion 12 b of the positive electrode plate 12 and the uncoated portion 13 b of the negative electrode plate 13 at both ends in the winding axis L direction of the electrode body 11. . In the following description, the uncoated portion 12b side of the positive electrode plate 12 will be described in detail.

  As shown in FIG. 4, the current collecting terminal 31 is formed by bending a metal plate. The current collecting terminal 31 includes a connection part 32 connected to the uncoated part 12 b of the positive electrode plate 12, a terminal connection part 33 connected to the positive electrode terminal 22 a, and a connecting part that connects the connection part 32 and the terminal connection part 33. 34.

  The connecting portion 32 and the connecting portion 34 extend along the major axis direction of the electrode body 11, and a step portion 35 extending along the winding axis L direction of the electrode body 11 is provided between the connecting portion 32 and the connecting portion 34. Is formed. A pair of connection allowances 32 a are erected along the winding axis L direction of the electrode body 11 at both side edges of the connection portion 32. The terminal connecting portion 33 is continuous with the connecting portion 34 and extends along the winding axis L direction of the electrode body 11.

  The current collecting terminal 31 is formed with a slit 50 into which a part of the heat transfer member 40 to which the first and second insulating members 41 and 42 are fixed can be inserted. Specifically, a first slit 50 a that forms a part of the slit 50 is formed in the connection portion 32 so as to extend along the major axis direction of the electrode body 11. In addition, the step portion 35 is formed with a second slit 50 b that forms a part of the slit 50 and continues to the first slit 50 a and extends along the winding axis L direction of the electrode body 11. Further, the connecting portion 34 is formed with a third slit 50 c that forms a part of the slit 50 and is connected to the second slit 50 b and extends along the major axis direction of the electrode body 11. The side of the first slit 50a opposite to the second slit 50b is open, and the side of the third slit 50c opposite to the second slit 50b is closed. That is, only one side of the slit 50 is opened.

  As shown in FIG. 6, the connection allowance 32 a of the connection portion 32 is entirely buried inside the innermost layer of the positive electrode plate 12, and the outer surface of the connection allowance 32 a and the uncoated portion of the positive electrode plate 12. It arrange | positions so that the inner peripheral surface of 12b may oppose. At this time, a part of the heat transfer member 40 to which the first and second insulating members 41 and 42 are fixed is inserted into the slit 50. The front and back surfaces 40 a and 40 b of the heat transfer member 40 and the current collecting terminal 31 are insulated by the first and second insulating members 41 and 42. Further, the one side surface 40c of the heat transfer member 40 and the current collecting terminal 31 are insulated from each other by an insulating sheet.

  And the electrode body 11 is pressurized from both sides in the compression direction, and joined by ultrasonic welding in a state where the outer surface of the connection allowance 32a and the inner peripheral surface of the uncoated portion 12b of the positive electrode plate 12 are brought into close contact with each other. Thereby, the current collection terminal 31 is connected across each layer of the positive electrode plate 12. The connecting portion 34 extends to the outside of the electrode body 11 while passing the outside in the winding axis L direction from the end portion of the positive electrode plate 12.

  Since the description on the negative electrode plate 13 side is the same as the description on the positive electrode plate 12 side in the above description, a detailed description thereof will be omitted. For this reason, in the description of the negative electrode plate 13 side, the “positive electrode plate 12” in the above description is changed to the “negative electrode plate 13”, the “uncoated portion 12b” is changed to the “uncoated portion 13b”, and the “positive electrode terminal 22a”. "Is replaced with" negative electrode terminal 22b ", respectively.

  As shown in FIG. 7, the electrode body 11 in which the positive electrode plate 12 is connected to the positive electrode terminal 22 a and the negative electrode plate 13 is connected to the negative electrode terminal 22 b through each current collecting terminal 31 is accommodated in the case body 21. . At this time, both ends 401 and 402 in the longitudinal direction of the heat transfer member 40 are accommodated in the inner surface of the first side wall 21b and the inner surface of the second side wall 21c by accommodating the electrode body 11 in the case main body 21 while forcibly pushing it in. The electrode body 11 is accommodated in the case main body 21 in a state of being in contact with.

  Moreover, the adhesive agent with high heat conductivity is previously apply | coated to the both ends 401 and 402 of the longitudinal direction of the heat-transfer member 40, both ends 401 and 402 of the heat-transfer member 40, the 1st side wall 21b, and the 2nd side wall 21c is bonded with an adhesive. Thereby, the electrode body 11 is accommodated in the case main body 21 in a state where both end portions 401 and 402 of the heat transfer member 40 are in contact with the inner surface of the first side wall 21b and the inner surface of the second side wall 21c. Further, in a state where the electrode body 11 is accommodated in the case body 21, the outermost layer of the electrode body 11 is in close contact with the inner surface of the third side wall 21d and the inner surface of the fourth side wall 21e. Then, the opening of the case body 21 is closed and sealed by the lid 22, whereby the secondary battery 10 is configured. That is, the first to fourth side walls 21 b, 21 c, 21 d, and 21 e correspond to peripheral walls that are erected from the peripheral edge of the lid 22.

Next, the temperature adjustment structure of the secondary battery 10 will be described.
As shown in FIG. 8, a battery module M in which a plurality of secondary batteries 10 of this embodiment are arranged in parallel is accommodated in a battery pack M1. A supply port M2 for supplying air as a heat medium into the battery pack M1 is formed in one end wall M10 of the battery pack M1. Further, a discharge port M3 for discharging the air in the battery pack M1 is formed in the other end wall M11 of the battery pack M1. A gap S1 is formed between adjacent secondary batteries 10. A gap S2 is formed between the secondary battery 10 that is positioned at the most end side in the direction in which the secondary batteries 10 are juxtaposed and the one side wall M12 that connects the one end wall M10 and the other end wall M11 of the battery pack M1. Yes. Further, a gap S3 is formed between the secondary battery 10 located on the most other end side in the juxtaposed direction of the secondary batteries 10 and the other side wall M13 connecting the one end wall M10 and the other end wall M11 of the battery pack M1. Is formed.

  Each secondary battery 10 is arranged such that the first side wall 21b faces the one end wall M10 side of the battery pack M1, and the second side wall 21c faces the other end wall M11 side of the battery pack M1. A communication path R1 is formed between the first side wall 21b of each secondary battery 10 and the one end wall M10 of the battery pack M1 so as to communicate with the supply port M2 and the gaps S1, S2, and S3. Further, a communication path R2 is formed between the second side wall 21c of each secondary battery 10 and the other end wall M11 of the battery pack M1 to communicate the gaps S1, S2, S3 and the discharge port M3. .

  When air is supplied from the supply port M2, the supplied air flows toward the gaps S1, S2, S3 via the communication path R1, and flows along the third side wall 21d and the fourth side wall 21e. . As a result of the air passing through the gaps S1, S2 and S3 flowing toward the discharge port M3 via the communication path R2, the air flows toward the second side wall 21c of each secondary battery 10. Flowing. Thereby, the first to fourth side walls 21b, 21c, 21d, 21e and the air are heat-exchanged. Therefore, in the present embodiment, the heat medium flow path is formed by the communication paths R1, R2 and the gaps S1, S2, S3 formed outside the first to fourth side walls 21b, 21c, 21d, 21e of each case 20. ing.

Next, the operation of this embodiment will be described.
For example, consider the case where the secondary battery 10 is cooled. Since the outermost layer of the electrode body 11 is in close contact with the third side wall 21d and the fourth side wall 21e, the heat outside the layer of the electrode body 11 is transmitted to the third side wall 21d and the fourth side wall 21e. The heat of the third side wall 21d and the fourth side wall 21e is radiated by heat exchange between the air whose temperature is adjusted to be lower than the temperature of the electrode body 11, and the third side wall 21d and the fourth side wall 21e. The As a result, the outside of the layer of the electrode body 11 is cooled.

  In addition, the innermost layer of the electrode body 11 is in close contact with the heat transfer member 40 via the first and second insulating members 41 and 42, and both end portions 401 and 402 of the heat transfer member 40 and the first The first side wall 21b and the second side wall 21c are in contact with each other. Therefore, the heat inside the layer of the electrode body 11 is transmitted to the first side wall 21b and the second side wall 21c through the first and second insulating members 41 and 42 and the heat transfer member 40. Then, the heat of the first side wall 21b and the second side wall 21c is radiated by heat exchange between the air whose temperature is adjusted to be lower than the temperature of the secondary battery 10 and the first side wall 21b and the second side wall 21c. Is done. As a result, the layer inside the electrode body 11 is cooled. As a result, during traveling of the plug-in hybrid vehicle, the temperature of the electrode body 11 is suppressed from exceeding a predetermined temperature, and the traveling performance of the plug-in hybrid vehicle is kept good. In addition, the performance of the secondary battery 10 is hardly deteriorated, and the life of the secondary battery 10 is extended.

  On the other hand, for example, consider the case where the secondary battery 10 is heated. The outermost layer of the electrode body 11 is in close contact with the third side wall 21d and the fourth side wall 21e. Therefore, the air whose temperature is adjusted to a temperature higher than the temperature of the electrode body 11 is exchanged with the third side wall 21d and the fourth side wall 21e, and the heat of the third side wall 21d and the fourth side wall 21e is exchanged. By being transmitted to the outside of the layer, the outside of the electrode body 11 is heated.

  In addition, the innermost layer of the electrode body 11 is in close contact with the heat transfer member 40 via the first and second insulating members 41 and 42, and both end portions 401 and 402 of the heat transfer member 40 and the first The first side wall 21b and the second side wall 21c are in contact with each other. Therefore, heat exchange is performed between the air whose temperature is adjusted to a temperature higher than the temperature of the electrode body 11, and the first side wall 21b and the second side wall 21c, and the heat of the first side wall 21b and the second side wall 21c is heat transfer member. It is transmitted to both ends 401 and 402 of 40. Then, heat is transferred to the inside of the layer of the electrode body 11 through the heat transfer member 40 and the first and second insulating members 41 and 42, whereby the inside of the layer of the electrode body 11 is heated. Thereby, for example, the secondary battery 10 can be heated in a low temperature environment, and the plug-in hybrid vehicle can be started smoothly.

In the above embodiment, the following effects can be obtained.
(1) The heat transfer member 40 in contact with the first side wall 21b and the second side wall 21c, which are the peripheral walls of the case 20, is interposed between the layers of the electrode body 11 via the first and second insulating members 41 and 42. Arranged. Therefore, compared with the case where the heat transfer member 40 is not in contact with the first side wall 21b and the second side wall 21c, the air supplied toward the case 20 and the inside of the layer of the electrode body 11 are separated from the case 20 and Heat exchange is facilitated via the heat transfer member 40. As a result, the temperature inside the layer of the electrode body 11 can be efficiently adjusted while ensuring the insulation between the electrode body 11 and the heat transfer member 40 by the first and second insulating members 41 and 42.

  (2) The first and second insulating members 41 and 42 were formed from ceramics having a thermal conductivity of 25.0 W / m · K or more. Therefore, while ensuring insulation between the electrode body 11 and the heat transfer member 40 by the first and second insulating members 41 and 42, the inside of the layer of the electrode body 11 via the case 20 and the heat transfer member 40, air, The heat exchange can be performed more efficiently.

  (3) A slit 50 into which the heat transfer member 40 can be inserted is formed in the current collecting terminal 31. Then, a part of the heat transfer member 40 is inserted into the slit 50 in a state where insulation between the heat transfer member 40 and the current collecting terminal 31 is ensured, and both end portions 401 and 402 of the heat transfer member 40 are all first. The side wall 21b and the second side wall 21c were brought into contact with each other. Therefore, compared to the case where the heat transfer member 40 is in contact with the first side wall 21b and the second side wall 21c so as to avoid the current collecting terminal 31, the heat transfer member 40, the first side wall 21b, and the second side wall 21b. The contact part with the side wall 21c can be increased. As a result, heat exchange between the inside of the layer of the electrode body 11 and the air via the case 20 and the heat transfer member 40 can be performed more efficiently.

  (4) The heat transfer member 40 is a metal plate, the first and second insulating members 41 and 42 are ceramic plates, and the first and second insulating members 41 and 42 cover both surfaces of the heat transfer member 40. It is fixed. Therefore, the heat transfer member 40 and the first and second insulating members 41 and 42 can be easily integrated.

  (5) The heat transfer member 40 is made of aluminum, and the first and second insulating members 41 and 42 are aluminum nitride. Therefore, the thermal conductivity of the heat transfer member 40 and the first and second insulating members 41 and 42 can be improved.

  (6) Communication paths R1, R2 and gaps S1, S2, S3 as heat medium flow paths are formed outside the first to fourth side walls 21b, 21c, 21d, 21e of each case 20. Therefore, heat exchange between the inside of the layer of the electrode body 11 and the air through the case 20 and the heat transfer member 40 can be performed more efficiently.

  (7) The 1st and 2nd insulating members 41 and 42 were formed from ceramics. Therefore, it is possible to prevent the first and second insulating members 41 and 42 from being dissolved in the electrolytic solution injected into the case 20.

In addition, you may change the said embodiment as follows.
In the embodiment, for example, recesses are formed on the outer surfaces of the first to fourth side walls 21b, 21c, 21d, 21e. And between the 1st side wall 21b of each secondary battery 10, and the one end wall M10 of the battery pack M1, between the 2nd side wall 21c of each secondary battery 10, and the other end wall M11 of the battery pack M1, two adjacent. A heat medium flow path may be formed between the secondary batteries 10 or between the secondary battery 10 and the one side wall M12 and the other side wall M13 of the battery pack M1 by a space defined by a recess.

  In the embodiment, the heat transfer member 40 may be provided so as to avoid the current collecting terminal 31. Specifically, as shown in FIG. 9, the heat transfer member 80 may have a shape in which a portion that interferes with the current collecting terminal 31 is deleted. Moreover, as shown in FIG. 10, the heat-transfer member 90 of the shape which shortened the length of the transversal direction so that it may not interfere with the current collection terminal 31 may be sufficient. In such a case, the slit 50 formed in the current collecting terminal 31 may be deleted.

  In the embodiment, the first and second insulating members 41 and 42 are made of ceramics. However, the present invention is not limited to this. For example, the first and second insulating members 41 and 42 are made of alumina, silicon nitride, diamond-like carbon, or conductive material. It may be formed from an insulating resin containing a conductive ceramic filler.

  In the embodiment, the first and second insulating members 41 and 42 may be deleted. In this case, for example, a separator 14 as an insulating member is interposed in the innermost layer of the electrode body 11, and the insulation between the electrode body 11 and the heat transfer member 40 is ensured by the separator 14.

  In the embodiment, a plurality of heat transfer members 40 may be disposed inside the layer of the electrode body 11. For example, the heat transfer member 40 may be further disposed between the innermost layer of the electrode body 11 and the second layer from the inside.

In embodiment, although the heat-transfer member 40 was formed from aluminum, it is not restricted to this, For example, you may be formed from copper.
In the embodiment, the heat medium is not limited to air, and may be a liquid heat medium, for example.

  In the embodiment, the heat transfer member 40 has both end portions 401 and 402 in contact with the first side wall 21b and the second side wall 21c of the case body 21. However, the present invention is not limited to this. Only one end 401 may be in contact with the first side wall 21b, or only the other end 402 of the heat transfer member 40 may be in contact with the second side wall 21c. In this case, the length R in the longitudinal direction of the heat transfer member 40 is shorter than the distance between the inner surface of the first side wall 21b and the inner surface of the second side wall 21c of the case body 21. And when the electrode body 11 is accommodated in the case main body 21, only the one end part 401 of the heat-transfer member 40 contacts the 1st side wall 21b, or only the other end part 402 of the heat-transfer member 40 is a 2nd side wall. The arrangement position with respect to the inner side of the innermost layer of the electrode body 11 in the heat transfer member 40 is adjusted so as to contact 21c. In addition, it is preferable that the edge part of the heat-transfer member 40 is contacting the side wall located in the distribution direction upstream of the air supplied to case 20. FIG. In the present embodiment, since air flows from the first side wall 21b side, only the other end portion 402 of the heat transfer member 40 is placed on the second side wall 21c in order to facilitate heat exchange with the air through the first side wall 21b. It is preferable that only one end 401 of the heat transfer member 40 is in contact with the first side wall 21b rather than in contact with the first side wall 21b.

  In the embodiment, as shown in FIG. 11, guide grooves 95 are formed on the inner surface of the first side wall 21 b and the inner surface of the second side wall 21 c of the case body 21 to guide the both end portions 401 and 402 of the heat transfer member 40. It may be. In this case, the length R in the longitudinal direction of the heat transfer member 40 is longer than the distance between the inner surface of the first side wall 21b of the case body 21 and the inner surface of the second side wall 21c. Further, the guide groove 95 may be formed only on the inner surface of the first side wall 21b of the case body 21 or the inner surface of the second side wall 21c.

  In the embodiment, the first and second insulating members 41 and 42 are fixed so as to cover the entire front surface 40a and the back surface 40b of the heat transfer member 40, but are not limited thereto. For example, at least the first and second insulating members 41 and 42 may be fixed to the surface 40 a and the back surface 40 b of the heat transfer member 40 in a range overlapping the electrode body 11 and the current collecting terminal 31. That is, if insulation between the heat transfer member 40 and the electrode body 11 and the current collecting terminal 31 is ensured, the first and second insulating members 41 and 42 are fixed to the front surface 40 a and the back surface 40 b of the heat transfer member 40. The range is not limited.

  In the embodiment, the side opposite to the second slit 50b in the first slit 50a of the current collecting terminal 31 may be closed. In this case, the connection part 32 is heat transfer in the major axis direction of the electrode body 11 so that the insertion hole as a slit into which the entire heat transfer member 40 can be inserted can be formed in the connection part 32 of the current collecting terminal 31. The member 40 needs to extend outward from the side surface 40d.

  In the embodiment, the connection allowance 32a of the connection portion 32 of the current collecting terminal 31 is entirely buried inside the innermost layer of the positive electrode plate 12, but not limited thereto, the connection allowance 32a is Only a part of the innermost layer of the positive electrode plate 12 may be buried inside.

  In the embodiment, the current collecting terminal 31 may be connected to the uncoated portions 12 b and 13 b located in the outermost layer of the electrode body 11 so as to avoid the heat transfer member 40. In such a case, the slit 50 formed in the current collecting terminal 31 may be deleted.

In the embodiment, the length R in the longitudinal direction of the heat transfer member 40 may be the same as the distance between the inner surface of the first side wall 21b and the inner surface of the second side wall 21c of the case body 21.
In the embodiment, insulating members made of ceramics having high thermal conductivity may be provided on both side surfaces 40c, 40d of the heat transfer member 40.

  In the embodiment, an insulating member made of ceramic having high thermal conductivity may be provided between the both end portions 401 and 402 of the heat transfer member 40 and the inner surface of the first side wall 21b and the inner surface of the second side wall 21c. Good.

  In the embodiment, a wound-type electrode configured by interposing a strip-shaped separator 14 between the strip-shaped positive electrode plate 12 and the negative electrode plate 13 and winding them around the winding axis L in a spiral manner. Although the body 11 is used, the present invention is not limited to this. For example, a laminated electrode body configured by laminating a plurality of separators in a certain direction with a separator interposed between the positive electrode plate and the negative electrode plate may be used. Good. Here, a laminated electrode body is an electrode body formed by laminating a positive electrode plate, a negative electrode plate, and a separator that are discontinuous in a certain direction. In this case, in addition to the 1st side wall 21b and the 2nd side wall 21c of the case main body 21, the heat transfer member 40 can be made to contact also the bottom wall 21a of the case main body 21, and the case main body 21, the heat transfer member 40, and The number of connection sites can be increased.

In embodiment, although the secondary battery 10 was mounted in the plug-in hybrid vehicle, it is not restricted to this, For example, you may mount in the electric vehicle.
The present invention has been embodied in the vehicle secondary battery 10, but is not limited thereto, and may be embodied in a secondary battery other than the vehicle.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) A battery module comprising a plurality of the secondary batteries according to any one of claims 1 to 5 arranged in parallel.

  M ... battery module, R1, R2 ... communication passage forming a heat medium flow path, S1, S2, S3 ... gap forming a heat medium flow path, 10 ... secondary battery, 11 ... electrode body, 12 ... positive electrode plate, 12a ... Coated part, 12b ... Uncoated part, 13 ... Negative electrode plate, 13a ... Coated part, 13b ... Uncoated part, 20 ... Case, 21b ... First side wall as peripheral wall, 21c ... First as peripheral wall 2 side walls, 22 ... lid as a terminal wall, 22a ... positive electrode terminal, 22b ... negative electrode terminal, 31 ... current collecting terminal, 40, 80, 90 ... heat transfer member, 41 ... first insulating member as insulating member, 42 ... Second insulating member as an insulating member, 50... Slit.

Claims (7)

Insulating between the positive electrode plate and the negative electrode plate, comprising an electrode body formed by forming these layers,
A secondary battery in which the electrode body is housed in a metal case in which a positive electrode terminal and a negative electrode terminal project outward.
A metal heat transfer member that contacts at least one of the peripheral walls erected from the peripheral edge of the terminal wall of the case from which the positive electrode terminal and the negative electrode terminal protrude is provided between the layers of the electrode body. A secondary battery, wherein the secondary battery is disposed via an insulating member.   The secondary battery according to claim 1, wherein the insulating member is made of a ceramic having a thermal conductivity of 25.0 W / m · K or more. The positive electrode plate and the negative electrode plate have a coated part to which an active material is applied and an uncoated part to which the active material is not applied,
Each uncoated portion of the positive electrode plate and the negative electrode plate protrudes opposite to each other toward the peripheral wall of the case, and a current collecting terminal is provided on each uncoated portion of the positive electrode plate and the negative electrode plate, respectively. Connected,
The current collecting terminal is formed with a slit,
3. The heat transfer member according to claim 1, wherein at least a part of the heat transfer member is inserted into the slit in a state where insulation between the heat transfer member and the current collecting terminal is ensured. The secondary battery as described.   4. The heat transfer member is a metal plate, the insulating member is a ceramic plate, and the ceramic plate is fixed so as to cover both surfaces of the metal plate. Secondary battery.   The secondary battery according to any one of claims 2 to 4, wherein the heat transfer member is made of aluminum, and the insulating member is aluminum nitride. It is the temperature control structure of the secondary battery as described in any one of Claims 1-5, Comprising:
A temperature control structure for a secondary battery, wherein a heat medium flow path is formed outside the peripheral wall of the case.   A vehicle equipped with the secondary battery according to any one of claims 1 to 5.