JP2008251437A - Power supply device and expansion detection method of electrochemical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device capable of more surely performing expansion detection of an electrochemical element. <P>SOLUTION: The power supply device 1 has a first circuit part 60 formed at a peripheral edge area 11 of an underside 10a of the electrochemical element 10, and a second circuit part 62 formed on a mounting face 48a of a retention board 48, with the second circuit part 62 in contact with the first circuit part 60. That is, before expansion of the electrochemical element 10, the first circuit part 60 and the second circuit part 62 are electrically conductive with each other, at the time of expansion of the electrochemical element 10, the first circuit part 60 and the second circuit part 62 are disconnected each other. So that expansion of the electrochemical element 10 is detected by detecting break between the first circuit part 60 and the second circuit part 62 with a detecting circuit 38. Therefore, expansion of the electrochemical element 10 can be detected in a simple structure in the power source device 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply device including an electrochemical element and a method for detecting expansion of the electrochemical element.

  Conventionally, in a power supply device incorporating a secondary battery, the internal pressure may increase due to decomposition of the electrolyte or the like, which may put the secondary battery in a dangerous state. Therefore, a technique for detecting the increase in internal pressure is disclosed in, for example, Patent Document 1 below.

The secondary battery disclosed in this publication can detect an increase in internal pressure of the secondary battery by having a sensor such as a pressure sensor.
Japanese Patent Laid-Open No. 2003-197268 JP-A-11-162527

  As a result of intensive research, the inventors have found a new technique capable of detecting an increase in internal pressure of an electrochemical element such as a secondary battery with a simple configuration.

  An object of the present invention is to provide a power supply device having a simple configuration and a method for detecting expansion of an electrochemical element.

  A power supply device according to the present invention includes an electrochemical element having an element body and an enclosure for enclosing the element body, an attachment portion having a fixing surface to which the electrochemical element is fixed, and an attachment portion side of the electrochemical element. A circuit part that is formed in at least one of the movable area of the surface and the fixed surface area of the mounting portion facing the movable area of the electrochemical element, and is disconnected when the electrochemical element expands, and connected to the circuit part And a detection unit that detects disconnection of the circuit unit.

  In this power supply device, a circuit part is formed in at least one of the electrochemical element and the attachment part. This circuit part is formed in the movable area of the surface on the attachment part side of the electrochemical element or the area of the fixed surface of the attachment part opposite to the movable area of the electrochemical element, and when the electrochemical element expands Disconnect. That is, the circuit portion that is in a conductive state before the expansion of the electrochemical element is disconnected when the electrochemical element expands. And the expansion | swelling of an electrochemical element is detected by detecting the disconnection of a circuit part by a detection part. Therefore, in this power supply device, the expansion of the electrochemical element can be detected with a simple configuration.

  A power supply device according to the present invention includes an electrochemical element having an element body and an enclosure for enclosing the element body, an attachment portion having a fixing surface to which the electrochemical element is fixed, and an attachment portion side of the electrochemical element. A first circuit portion formed in a movable region of the surface; a second circuit portion formed on a fixed surface of the mounting portion and in contact with the first circuit portion; a first circuit portion and a second circuit portion; And a detector for detecting disconnection between the two.

  In this power supply device, the first circuit portion is formed in the movable region of the surface on the attachment portion side of the electrochemical element, and the second circuit portion is formed on the fixed surface of the attachment portion. The second circuit portion is in contact with the first circuit portion. That is, before the expansion of the electrochemical element, the first circuit part and the second circuit part are in a conductive state, and are disconnected from each other when the electrochemical element is expanded. And the expansion | swelling of an electrochemical element is detected by detecting the disconnection between a 1st circuit part and a 2nd circuit part by a detection part. Therefore, in this power supply device, the expansion of the electrochemical element can be detected with a simple configuration.

  A power supply device according to the present invention includes an electrochemical element having an element body and an enclosure for enclosing the element body, an attachment portion having a fixing surface to which the electrochemical element is fixed, and an attachment portion side of the electrochemical element. The first circuit portion formed on one of the movable region of the surface and the fixed surface region of the mounting portion facing the movable region of the electrochemical element, and the movable region of the surface on the electrochemical element mounting portion side And a second circuit portion formed on the other of the fixed surface regions of the mounting portion facing the movable region of the electrochemical element, and the partially disconnected wire section is energized by the first circuit portion. And a detection unit connected to the second circuit unit and detecting disconnection of the second circuit unit.

  In this power supply device, the first circuit portion is formed in one of the movable region of the surface on the attachment portion side of the electrochemical element and the fixed surface region of the attachment portion facing the movable region of the electrochemical element. The second circuit portion is formed on the other side. And this 2nd circuit part has the disconnection area partially disconnected, and this disconnection area is energized by the 1st circuit part. That is, before the expansion of the electrochemical element, the second circuit part is in a conductive state, and when the electrochemical element is expanded, the first circuit part is separated from the second circuit part, and the second circuit part is Disconnected. And the expansion | swelling of an electrochemical element is detected by detecting the disconnection of a 2nd circuit part by a detection part. Therefore, in this power supply device, the expansion of the electrochemical element can be detected with a simple configuration. In addition, the area | region of the fixed surface facing the movable area | region of an electrochemical element shall include not only the area | region which overlaps with the movable area | region completely, but the area | region which overlapped partially.

  The power supply device according to the present invention includes an electrochemical element having an element body and an enclosure for enclosing the element body, an attachment portion having a fixing surface to which the electrochemical element is fixed, and an attachment portion side of the electrochemical element. A circuit portion that is formed in at least one of the movable region of the surface and the fixed surface region of the mounting portion facing the movable region of the electrochemical element, and is disconnected when the electrochemical element expands, Is connected to the electrode of the electrochemical element.

  In this power supply device, a circuit part is formed in at least one of the electrochemical element and the attachment part. This circuit part is formed in the movable area of the surface on the attachment part side of the electrochemical element or the area of the fixed surface of the attachment part opposite to the movable area of the electrochemical element, and when the electrochemical element expands Disconnect. That is, the circuit portion that is in a conductive state before the expansion of the electrochemical element is disconnected when the electrochemical element expands. And since the circuit part is connected to the electrode of the electrochemical element, the charge and discharge of the electrochemical element can be stopped and the expansion of the electrochemical element can be detected by the disconnection of the circuit part. Therefore, in this power supply device, the expansion of the electrochemical element can be detected with a simple configuration.

  Further, the movable region of the surface on the attachment portion side of the electrochemical element is a peripheral region of the surface on the attachment portion side of the electrochemical device. Since the peripheral region moves away from the fixed surface in accordance with the expansion of the electrochemical element, the peripheral region can function as a movable region.

  The method for detecting expansion of an electrochemical element according to the present invention includes a fixing surface on which an electrochemical element is fixed when the electrochemical element having an element body and an enclosure for enclosing the element element expands, and electrochemical A circuit portion formed on at least one of the surfaces on the fixed surface side of the element is disconnected, and the expansion of the electrochemical element is detected.

  In this method of detecting expansion of an electrochemical element, a circuit portion formed on at least one of the electrochemical element and its fixing surface is disconnected when the electrochemical element expands. That is, the circuit portion that is in a conductive state before the expansion of the electrochemical element is disconnected when the electrochemical element expands. Therefore, in this method for detecting an electrochemical element, the expansion of the electrochemical element can be detected with a simple configuration.

  ADVANTAGE OF THE INVENTION According to this invention, the expansion | swelling detection method of the power supply device and electrochemical element of a simple structure is provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments that are considered to be the best in carrying out the invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected about the same or equivalent element, and the description is abbreviate | omitted when description overlaps.
(First embodiment)

  A power supply device 1 according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the power supply device 1 includes an electrochemical element 10, a control board 30 attached to the electrochemical element 10, and a holding board 48 that holds the electrochemical element 10 and the control board 30. .

  The electrochemical element 10 is a rectangular thin plate-shaped laminated lithium ion secondary battery. As shown in FIGS. 1 and 2, the electrochemical element 10 includes an element 12 and an encapsulating film 14 (encapsulant) enclosing the element 12. Have. The element body 12 has a substantially flat plate shape and includes a separator 20 interposed between a negative electrode 16 and a positive electrode 18. Further, a negative electrode lead 22 (for example, made of copper or nickel) is connected to the negative electrode 16, and one end of the negative electrode lead 22 is exposed from the encapsulating film 14, so that the first electrode of the electrochemical device 10 is exposed. (22) is formed. Furthermore, a positive electrode lead 24 (for example, made of aluminum) is connected to the positive electrode 18, and one end portion of the positive electrode lead 24 is exposed from the encapsulating film 14, so that the second electrode (24 of the electrochemical device 10). ) Is formed.

  The encapsulating film 14 is formed by bending a single layer or a plurality of layers so as to wrap the element body 12, and overlapping edges are joined by an adhesive or heat seal. As the encapsulating film 14, a composite film that employs an Al foil as an inner layer and a polypropylene (PP) layer as an outer layer can be used. The encapsulating film 14 is filled with an electrolyte solution 26 containing lithium ions, and the element body 12 is encapsulated in an encapsulated film 14 filled with the electrolyte solution 26 in a sealed state. The upper and lower surfaces of the electrochemical element 10 are flat surfaces, similar to the surface shape of the element body 12.

  The control board 30 is a board to which the negative electrode 22 and the positive electrode 24 of the electrochemical element 10 described above are connected via a pair of connection cords 32 and 34. The control board 30 is connected to an input / output connector 36 used for input / output with an external device. Further, various circuits including a detection circuit (detection unit) 38 described later are formed on the control board 30.

  The holding substrate 48 is a mounting portion in the present invention, and is a quadrangular plate member. The electrochemical element 10 described above is fixed so as to be in direct contact with the flat main surface 48a of the holding substrate 48, and the surface 52a is a mounting surface (fixed surface) of the electrochemical element 10. . The holding substrate 48 does not necessarily have a plate shape, and may be appropriately changed to a thick object (for example, a robot or an electric device) as long as it is a member having a flat surface.

  And in the power supply device 1 mentioned above, as shown in FIGS. 1-3, it is the peripheral area | region (movable area | region) 11 of the lower surface 10a of the electrochemical element 10, and one periphery of the short side of the electrochemical element 10 A first circuit portion 60 is formed in the region 11. The first circuit portion 60 is a single uniform-width copper foil, and is attached to the surface of the encapsulating film 14 of the electrochemical element 10 with an adhesive material. One end of the first circuit unit 60 is connected to the detection circuit 38 of the control board 30 via the connection cable 40. Further, the first circuit portion 60 has a straight portion 60 a that extends straight along the short direction of the electrochemical element 10 in the peripheral edge portion 11. Here, the movable region in the present invention refers to a region that moves away from the fixed surface 48a in accordance with the expansion of the electrochemical element 10 to be described later, and is a region that is fixed to the holding substrate 48 like the peripheral region 11 described above. This refers to areas other than.

  As shown in FIGS. 1 to 3, the holding substrate 48 has a second circuit portion 62 formed on the main surface 48 a of the holding substrate 48 in a region corresponding to the peripheral region 11. Similarly to the first circuit unit 60, the second circuit unit 62 is also a single uniform-width copper foil, and is attached to the main surface 48a of the holding substrate 48 with an adhesive. One end of the second circuit unit 62 is connected to the detection circuit 38 of the control board 30 via the connection cable 42. Further, the second circuit portion 62 is arranged such that the linear portion 62a having substantially the same shape as the linear portion 60a of the first circuit portion 60 overlaps the linear portion 60a of the first circuit portion 60. 60 linear portions 60a are formed in parallel.

  That is, in a state where the electrochemical element 10 is mounted on the main surface 48 a of the holding substrate 48, the linear portion 60 a of the first circuit unit 60 and the second circuit unit are interposed between the electrochemical element 10 and the holding substrate 48. 62 linear portions 62a are in contact with each other. The electrochemical element 10 is attached to the holding substrate 48 with a predetermined adhesive material or double-sided tape. Since the application area of the adhesive material and the application location of the double-sided tape in the electrochemical element 10 are areas fixed to the holding substrate 48, the peripheral area in which the first circuit section 60 is formed is used as a movable area. It is necessary to avoid the peripheral area. And if it is area | regions other than this peripheral area | region, it will not restrict | limit in particular, For example, the center vicinity of the lower surface 10a of the electrochemical element 10 may be sufficient.

  Next, the wiring state of the power supply device 1 will be described with reference to FIG. The detection circuit 38 formed on the control board 30 has, for example, the configuration shown in FIG. 4. When the first circuit unit 60 and the second circuit unit 62 are in a conductive state, the electrical circuit via the input / output connector 36 is used. When the chemical element 10 can be charged / discharged and the first circuit part 60 and the second circuit part 62 are disconnected, the electrochemical element 10 has a function of being unable to charge / discharge.

  Subsequently, a state where the electrochemical element 10 is expanded in the first embodiment will be described with reference to FIGS. 5 and 6.

  When the electrochemical device 10 is in an overcharged state, the voltage rises, the electrolytic solution in the device is decomposed, and the internal pressure rises. As a result, the electrochemical device 10 expands as shown in FIGS. 5 and 6. At this time, because of the structure of the electrochemical element 10, the maximum expansion position is the central position C, and the vicinity of the periphery of the electrochemical element 10 is lifted from the mounting surface 48 a of the holding substrate 48.

  At this time, as the electrochemical element 10 expands, the first circuit portion 60 formed on the lower surface 10 a of the electrochemical element 10 gradually moves away from the holding substrate 48. Accordingly, as shown in FIGS. 5 and 6, the linear portion 60 a of the first circuit portion 60 and the linear portion 62 a of the second circuit portion 62 are not in contact with each other, and the first circuit portion 60 and the second circuit portion 60 are not in contact with each other. The circuit portion 62 is disconnected. Then, the detection circuit 38 detects a disconnection between the first circuit unit 60 and the second circuit unit 62, and puts the electrochemical element 10 into a state where it cannot be charged / discharged.

  In the power supply device 1, the first circuit portion 60 is formed in the peripheral region 11 of the lower surface 10 a of the electrochemical element 10, and the second circuit portion 62 is formed on the mounting surface 48 a of the holding substrate 48. Yes. The second circuit unit 62 is in contact with the first circuit unit 60. That is, before the expansion of the electrochemical element 10, the first circuit part 60 and the second circuit part 62 are in a conductive state, and when the electrochemical element 10 is expanded, the first circuit part 60 and the second circuit part. The part 62 is disconnected from each other. The expansion of the electrochemical device 10 is detected by detecting the disconnection between the first circuit unit 60 and the second circuit unit 62 by the detection circuit 38.

  And the detection circuit 38 which detected the expansion | swelling of the electrochemical element 10 makes the electrochemical element 10 a state which cannot be charged / discharged. Will be stopped.

  Therefore, although the power supply device 1 and the method for detecting expansion of the electrochemical element 10 have the simple configuration as described above, the expansion of the electrochemical element 10 can surely be detected.

  Further, as an expansion detection of a conventional electrochemical element, when the electrochemical element expands, it contacts a contact provided on the ceiling surface of the housing and detects the contact to expand the electrochemical element. There is something to detect. However, in such a case, due to the contact failure between the electrochemical element and the contact, the contact does not function, and it is difficult to detect expansion with high certainty. For example, it is conceivable that the position or posture of the contact changes and the electrochemical element cannot be contacted, or an insulating oxide film is formed on the surface of the contact so that the contact does not function.

  In the first embodiment described above, the first and second circuit units 60 and 62 are in a conductive state before the electrochemical element 10 is expanded, and the first and second circuit units 60 are in an expanded state when the electrochemical element 10 is expanded. 62 are disconnected, so that the problem of contact failure is effectively avoided. Therefore, in the power supply device 1 and the method for detecting expansion of the electrochemical element 10 described above, it is possible to detect expansion of the electrochemical element 10 with high certainty. In addition, the casing is an essential component in the conventional expansion detection, but in the first embodiment, the power supply device 1 without the casing can detect expansion. Therefore, in the thickness direction of the electrochemical element 10, it is sufficient if there is a space of the thickness of the electrochemical element 10 as an installation space, and space saving can be achieved as compared with the conventional case.

  In the aspect described above, the linear portion 60 a of the first circuit unit 60 and the linear portion 62 of the second circuit unit 62 are sensing portions that detect expansion of the electrochemical element 10. In this sensing portion, the sensitivity of expansion detection changes according to the distance from the maximum expansion position (that is, the center position C) of the electrochemical element 10. Therefore, a desired detection sensitivity can be obtained by changing the position of the sensing portion so that the distance from the maximum expansion position of the electrochemical element 10 changes.

  Further, in the normal state where the electrochemical element 10 is not expanded, the first and second circuit portions 60 and 62 are conductive, so that the first and second circuits are inspected when the power supply device 1 is inspected. By inspecting the energization of the parts 60 and 62, it can be confirmed that the function of expansion detection of the power supply device 1 operates properly. In addition, defective products such as assembly defects can be easily detected from the products.

  In addition, what is necessary is just to set it as a wiring state as shown in FIG. That is, the electrodes of the electrochemical device 10 are connected in series and connected in series, and the first and second circuits 60 and 62 are also connected in series, and the pair of any of the first and second circuit portions 60 and 62 is connected. A mode in which charging / discharging of all the electrochemical elements 10 is stopped by the detection circuit 38 when the battery is disconnected is also possible.

Further, the wiring states of the first and second circuit units 60 and 62 can be changed as shown in FIG. That is, as shown in FIG. 8, when the first and second circuit portions 60 and 62 are connected in series to one of the first and second electrodes 22 and 24 of the electrochemical device 10, the electrochemical operation is performed. When the element 10 expands and the first circuit part 60 and the second circuit part 62 are disconnected, charging / discharging of the electrochemical element 10 is stopped. Therefore, the expansion of the electrochemical element 10 can be detected by stopping the charging / discharging. Therefore, according to such an aspect, in addition to the effect of the power supply device 1 described above, an effect that the detection circuit 38 can be omitted can be obtained. As a result, simplification, size reduction, cost reduction, etc. of the power supply device 1 can be realized.
(Second Embodiment)

  A power supply device 1A according to a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 9, the power supply device 1 </ b> A includes an electrochemical element 10, a control board 30 attached to the electrochemical element 10, and a housing 50 that houses the electrochemical element 10 and the control board 30. The only difference from the power supply device 1 according to the first embodiment is that the above-described holding substrate 48 is a casing 50.

  The casing 50 includes a flat bottom plate portion 52 and a top plate portion 54 that sandwich the electrochemical element 10 from above and below, and a side plate portion 56 that connects the peripheral portion of the bottom plate portion 52 and the peripheral portion of the top plate portion 54. This is a rectangular resin case. The casing 50 can be appropriately changed from its shape and constituent materials, and may be, for example, a disk-shaped aluminum can.

  And the electrochemical element 10 is being fixed so that it may contact | connect directly to the flat inner surface (upper surface) 52a of the baseplate part 52 of the housing | casing 50 which is an attachment part in this invention, and this surface 52a is the electrochemical element 10's. It is a mounting surface (fixed surface). As shown in FIGS. 9 to 11, the housing 50 is formed with a second circuit portion 62 on the inner surface 52 a of the bottom plate portion 52 in a region corresponding to the peripheral region 11 of the electrochemical element 10. ing.

  That is, in a state where the electrochemical element 10 is mounted on the mounting surface 52a of the casing 50, the linear portion 60a and the second portion 60a of the first circuit section 60 are between the electrochemical element 10 and the casing 50 bottom plate portion 52. And the linear portion 62a of the circuit portion 62 are in contact with each other.

  Also in the second embodiment, as in the first embodiment, when the electrochemical element 10 expands, as shown in FIGS. 12 and 13, the maximum expansion position is the central position C due to its structure, and the electrochemical element 10 The vicinity of the peripheral edge of the housing 50 is lifted from the mounting surface 52 a of the bottom plate portion 52 of the housing 50. Further, the vicinity of the center position C of the electrochemical element 10 is in contact with the ceiling surface of the top plate portion 54 of the housing 50.

  At this time, as the electrochemical element 10 expands, the first circuit portion 60 formed on the lower surface 10 a of the electrochemical element 10 gradually moves away from the bottom plate portion 52 of the housing portion 50. Accordingly, as shown in FIGS. 12 and 13, the linear portion 60 a of the first circuit portion 60 and the linear portion 62 a of the second circuit portion 62 are not in contact with each other, and the first circuit portion 60 and the second circuit portion 60 are not in contact with each other. The circuit portion 62 is disconnected. Then, the detection circuit 38 detects a disconnection between the first circuit unit 60 and the second circuit unit 62, and puts the electrochemical element 10 into a state where it cannot be charged / discharged.

  In the power supply device 1A, the first circuit portion 60 is formed in the peripheral region 11 of the lower surface 10a of the electrochemical element 10, and the second circuit portion is formed on the mounting surface 52a of the bottom plate portion 52 of the casing portion 50. 62 is formed. The second circuit unit 62 is in contact with the first circuit unit 60. That is, before the expansion of the electrochemical element 10, the first circuit part 60 and the second circuit part 62 are in a conductive state, and when the electrochemical element 10 is expanded, the first circuit part 60 and the second circuit part. The part 62 is disconnected from each other. The expansion of the electrochemical device 10 is detected by detecting the disconnection between the first circuit unit 60 and the second circuit unit 62 by the detection circuit 38.

  And the detection circuit 38 which detected the expansion | swelling of the electrochemical element 10 makes the electrochemical element 10 a state which cannot be charged / discharged, and when abnormality occurs in the electrochemical element 10 and it expands, the charging / discharging of the electrochemical element 10 is carried out. Will be stopped.

  Therefore, although the above-described power supply device 1A has the simple configuration as described above, the expansion of the electrochemical element 10 can be surely detected as in the power supply device 1 according to the first embodiment.

  In the second embodiment described above, the first and second circuit portions 60 and 62 are in a conductive state before the electrochemical element 10 is expanded, and the first and second circuits are in the conductive state when the electrochemical element 10 is expanded. Since the parts 60 and 62 are in a disconnected state, the problem of the contact failure is effectively avoided. Therefore, also in the power supply device 1A described above, it is possible to detect expansion of the electrochemical element 10 with high certainty.

  Further, in the normal state where the electrochemical element 10 is not expanded, the first and second circuit portions 60 and 62 are conductive, so that the first and second circuits are inspected when the power supply device 1A is inspected. By inspecting the energization of the parts 60 and 62, it can be confirmed that the function of detecting the expansion of the power supply device 1A operates properly. In addition, defective products such as assembly defects can be easily detected from the products.

  Furthermore, there may be a mode in which the electrochemical element 10 itself becomes the attachment portion as the attachment portion on which the electrochemical element 10 is mounted. That is, as shown in FIG. 14, in the case of the power supply device 1 </ b> B in which a plurality of electrochemical elements 10 are accommodated in the housing 50, the first and second circuit units described above are provided on the opposing surfaces 10 a and 10 a. 60, 62 are formed. In this case, the electrochemical element 10 to which the first circuit part 60 is attached and the electrochemical element 10 to which the second circuit part 62 is attached can be appropriately replaced. Even in the embodiment of the plurality of electrochemical elements 10 shown in FIG. 14, when at least one electrochemical element 10 expands, the first circuit unit 60 and the second circuit unit 62 are disconnected, and thus the detection circuit 38. Disconnection can be detected by.

Moreover, as an attachment part in which the electrochemical element 10 is mounted, there may be an aspect in which a plate interposed between the two electrochemical elements 10 serves as the attachment part. That is, when the plurality of electrochemical elements 10 are accommodated in the casing 50 in a stacked manner as in the power supply device 1C shown in FIG. The aspect which forms the circuit part 62 may be sufficient. By fixing the plate 58 to the housing 50, the electrochemical element 10 can be held on both surfaces 58a and 58b of the plate 58, so that a sufficient expansion space is provided for each of the electrochemical elements 10 arranged on both sides. Can be provided. Even if it is an aspect shown in FIG. 15, when the electrochemical element 10 expand | swells, since the 1st circuit part 60 and the 2nd circuit part 62 are disconnected, the disconnection can be detected by the detection circuit 38. FIG.
(Third embodiment)

  Next, a power supply device 1D according to a third embodiment of the present invention will be described with reference to FIGS. The power supply device 1D according to the third embodiment is different from the power supply device 1A according to the second embodiment described above only in the shape of the formed circuit, and the other points are the same as or equivalent to the power supply device 1A. It is.

  That is, in the power supply device 1D according to the third embodiment, first and second circuit portions 64 and 66 are formed instead of the first and second circuit portions 60 and 62 of the power supply device 1A described above. Yes.

  The first circuit portion 64 is a rectangular copper foil, and is attached to the peripheral region 11 on the lower surface 10a of the electrochemical element 10 and to one peripheral region 11 on the short side of the electrochemical device 10 with an adhesive. It has been. On the other hand, the second circuit portion 66 is two equal-width strip copper foils, and is attached to the inner surface 52a of the bottom plate portion 52 with an adhesive material. One end of each of the two copper foils is connected to the detection circuit 38 of the control board 30 via connection cables 40 and 42. The other end portions of the two copper foils are arranged close to each other in a region corresponding to the peripheral region 11 to form a disconnection section 66a (see FIG. 17). As shown in FIGS. 16 and 17, the first circuit section 64 described above is disposed at a position that is hung on the disconnection section 66 a of the second circuit section 66. Therefore, in a state where the electrochemical element 10 is mounted on the mounting surface 52a of the casing 50, as shown in FIG. 17 (a), the second element is interposed between the electrochemical element 10 and the casing 50 bottom plate portion 52. The first circuit unit 64 is in contact with the circuit unit 66 so that the second circuit unit 64 is conductive.

  The wiring state of the power supply device 1D is as shown in FIG. 18, and the detection circuit 38 formed on the control board 30 charges and discharges the electrochemical element 10 when the second circuit portion 66 is in a conductive state. When the second circuit portion 66 is in a disconnected state, the electrochemical device 10 has a function of making it impossible to charge and discharge.

  Next, a state where the electrochemical element 10 is expanded in the third embodiment will be described with reference to FIG.

  When the electrochemical device 10 is in an overcharged state, the voltage rises, the electrolytic solution in the device is decomposed, and the internal pressure rises. Thereby, the electrochemical element 10 expands as shown in FIGS. 17A and 17B, and the first circuit portion 64 formed on the lower surface 10 a of the electrochemical element 10 is accompanied by the expansion. It gradually moves away from the bottom plate part 52 of the housing part 50. As a result, the disconnection section 66a of the second circuit unit 66 is not connected to the first circuit unit 64, and the second circuit unit 66 is disconnected. Then, the detection circuit 38 detects the disconnection of the second circuit unit 66 and puts the electrochemical element 10 into a state where it cannot be charged / discharged.

  Also in this power supply device 1D, as with the power supply device 1A according to the second embodiment, the first circuit portion 64 formed in the peripheral region 11 of the lower surface 10a of the electrochemical element 10 is accompanied by the expansion of the electrochemical element 10. , Away from the second circuit portion 66 formed on the mounting surface 52 a of the bottom plate portion 52 of the housing portion 50. That is, before the expansion of the electrochemical element 10, the first circuit part 64 and the second circuit part 66 are in contact with each other and the second circuit part 66 is in a conductive state. The circuit section 64 and the second circuit section 66 are separated from each other, and the second circuit section 66 is disconnected. The expansion of the electrochemical device 10 is detected by detecting the disconnection of the second circuit portion 66 by the detection circuit 38.

  Therefore, although the power supply device 1D described above has the simple configuration as described above, it can certainly detect the expansion of the electrochemical element 10 like the power supply devices 1 and 1A according to the first and second embodiments. it can.

  In the third embodiment, as in the first and second embodiments, the first and second circuit portions 60 and 62 are in a conductive state before the electrochemical element 10 is expanded, and when the electrochemical element 10 is expanded. Since the first and second circuit portions 60 and 62 are disconnected, the problem of contact failure is effectively avoided. Therefore, also in the power supply device 1D described above, it is possible to detect expansion of the electrochemical element 10 with high certainty.

The wiring state of the first and second circuit portions 64 and 66 can be changed as shown in FIG. That is, as shown in FIG. 19, when the second circuit portion 66 is connected in series to one of the first and second electrodes 22 and 24 of the electrochemical element 10, the electrochemical element 10 expands. When the second circuit portion 66 is disconnected, charging / discharging of the electrochemical device 10 is stopped. Therefore, the expansion of the electrochemical element 10 can be detected by stopping the charging / discharging. Therefore, according to such an aspect, in addition to the effect of the power supply device 1D described above, an effect that the detection circuit 38 can be omitted can be obtained. As a result, simplification of the configuration of the power supply device 1D, size reduction, cost reduction, and the like can be realized.
(Fourth embodiment)

  Next, a power supply device 1E according to a fourth embodiment of the present invention will be described with reference to FIGS. The power supply device 1E according to the fourth embodiment is different from the power supply devices 1A and 1D according to the second embodiment and the third embodiment described above only in the shape of a circuit to be formed. It is the same as or equivalent to the power supply devices 1A and 1D.

  That is, in the power supply device 1E according to the fourth embodiment, a circuit unit 68 is formed instead of the first and second circuit units 64 and 66 of the power supply device 1D according to the third embodiment described above.

  The circuit portion 68 is two equal-width strip-like copper foils, and is attached to the inner surface 52 a of the bottom plate portion 52 with an adhesive material. One end of each of the two copper foils of the circuit unit 68 is connected to the detection circuit 38 of the control board 30 via connection cables 40 and 42. The other end portions of the two copper foils are close to each other in the peripheral region 11 of the lower surface 10a of the electrochemical device 10 and corresponding to the one peripheral region 11 on the short side of the electrochemical device 10. It arrange | positions and forms the disconnection area 68a (refer FIG. 21). As shown in FIGS. 20 and 21, a disconnection section 68 a of the circuit unit 68 is provided with a contact switch 70 having a spring property. Therefore, in a state where the electrochemical element 10 is mounted on the mounting surface 52a of the housing 50, the contact switch 70 is provided between the electrochemical device 10 and the housing 50 bottom plate portion 52 as shown in FIG. Are connected to each other so that the circuit portion 68 is electrically connected.

  The wiring state of the power supply device 1E is as shown in FIG. 22, and the detection circuit 38 formed on the control board 30 can charge and discharge the electrochemical element 10 when the circuit unit 68 is in a conductive state. When the circuit unit 68 is in a disconnected state, the electrochemical device 10 has a function of making it impossible to charge and discharge.

  Next, a state where the electrochemical element 10 is expanded in the fourth embodiment will be described with reference to FIG.

  When the electrochemical device 10 is in an overcharged state, the voltage rises, the electrolytic solution in the device is decomposed, and the internal pressure rises. Thereby, the electrochemical element 10 expands as shown in FIGS. 21 (a) and (b), and along with the expansion, the pressing force from the lower surface 10a of the electrochemical element 10 against the contact switch 70 decreases, The contact switch 70 is turned off. As a result, the disconnection section 68a of the circuit unit 68 is not connected to the contact switch 70, and the circuit unit 68 is disconnected. Then, the detection circuit 38 detects the disconnection of the circuit unit 68 to make the electrochemical element 10 in a state where it cannot be charged / discharged.

  Also in this power supply device 1E, it was formed in the mounting surface 52a of the bottom plate part 52 of the housing | casing part 50 with expansion | swelling of the electrochemical element 10 like the power supply devices 1, 1A, 1D which concern on 1st-3rd embodiment. A contact switch 70 at a position corresponding to the peripheral region 11 of the lower surface 10 a of the electrochemical device 10 of the circuit unit 68 disconnects the circuit unit 68. That is, before the electrochemical element 10 is expanded, the circuit unit 68 is in a conductive state by energization by the contact switch 70, and when the electrochemical element 10 is expanded, the contact switch 70 is disconnected and the circuit unit 68 is disconnected. The expansion of the electrochemical device 10 is detected by detecting the disconnection of the second circuit portion 68 by the detection circuit 38.

  Therefore, although the power supply device 1E described above has the simple configuration as described above, it surely detects the expansion of the electrochemical element 10 like the power supply devices 1, 1A, 1D according to the first to third embodiments. Can do.

  Also in the fourth embodiment, as in the first to third embodiments, the circuit unit 68 is in a conductive state before the electrochemical element 10 is expanded, and the circuit unit 68 is disconnected when the electrochemical element 10 is expanded. Therefore, the problem of the contact failure is effectively avoided. Therefore, also in the power supply device 1E described above, it is possible to detect the expansion of the electrochemical element 10 with high certainty.

  Note that the wiring state of the circuit unit 68 can also be changed as shown in FIG. That is, as shown in FIG. 23, when the circuit unit 68 is connected in series to one of the first and second electrodes 22 and 24 of the electrochemical element 10, the electrochemical element 10 expands and the circuit unit When 68 is disconnected, charging / discharging of the electrochemical device 10 is stopped. Therefore, the expansion of the electrochemical element 10 can be detected by stopping the charging / discharging. Therefore, according to such an aspect, in addition to the effect of the power supply device 1E described above, an effect that the detection circuit 38 can be omitted can be obtained. As a result, simplification, size reduction, cost reduction, etc. of the power supply device 1E can be realized.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, only the lithium ion secondary battery has been described as the electrochemical element, but the present invention can also be applied to other secondary batteries and elements such as electric double layer capacitors. Further, when the detection circuit (detection unit) detects disconnection of the circuit, the detection circuit may perform control for reducing the level of charge / discharge instead of control for stopping charge / discharge of the electrochemical element. . In the above-described embodiment, the encapsulating film has been described as an example of the encapsulating body. However, for example, the encapsulating film in which the element body is encapsulated is accommodated in a metal case (for example, an aluminum can). An embodiment in which the inclusion body is configured by is also possible.

It is the figure which showed schematic structure of the power supply device which concerns on 1st Embodiment of this invention. It is the II-II sectional view taken on the line of the power supply device shown in FIG. It is the III-III sectional view taken on the line of the power supply device shown in FIG. It is a wiring diagram of the power supply device shown in FIG. It is the figure which showed the state of the electrochemical element at the time of expansion | swelling in the cross section of FIG. It is the figure which showed the state of the electrochemical element at the time of expansion in the cross section of FIG. It is the wiring diagram which showed the state by which the some electrochemical element was connected in series. It is the figure which showed the different wiring state of the power supply device shown in FIG. It is the figure which showed schematic structure of the power supply device which concerns on 2nd Embodiment of this invention. It is XX sectional drawing of the power supply device shown in FIG. It is the XI-XI sectional view taken on the line of the power supply device shown in FIG. It is the figure which showed the state of the electrochemical element at the time of expansion in the cross section of FIG. It is the figure which showed the state of the electrochemical element at the time of expansion in the cross section of FIG. It is the figure which showed the different aspect of the power supply device shown in FIG. It is the figure which showed the different aspect of the power supply device shown in FIG. It is the figure which showed schematic structure of the power supply device 1 which concerns on 3rd Embodiment of this invention. It is the XVII-XVII line sectional drawing of the power supply device shown in FIG. 16, (a) is the figure which showed the state of the electrochemical element before expansion | swelling, (b) was the figure which showed the state of the electrochemical element at the time of expansion | swelling It is. It is a wiring diagram of the power supply device shown in FIG. It is the figure which showed the different wiring state of the power supply device shown in FIG. It is the figure which showed schematic structure of the power supply device which concerns on 4th Embodiment of this invention. It is the XXI-XXI sectional view of the power supply device shown in FIG. 20, (a) is a diagram showing the state of the electrochemical device before expansion, (b) is a diagram showing the state of the electrochemical device during expansion It is. It is a wiring diagram of the power supply device shown in FIG. It is the figure which showed the different wiring state of the power supply device shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C, 1D, 1E ... Power supply device, 10 ... Electrochemical element, 10a ... Lower surface, 11 ... Peripheral region, 12 ... Element body, 14 ... Encapsulated film, 22, 24 ... Electrode, 30 ... Control board 38 ... detection circuit, 48 ... holding substrate, 48a ... main surface, 50 ... housing, 52 ... bottom plate part, 52a ... inner surface, 60, 62, 64, 66, 68 ... circuit part, 66a, 68a ... disconnection section.

Claims (6)

An electrochemical element having an element body and an enclosure for enclosing the element body;
A mounting portion having a fixing surface to which the electrochemical element is fixed;
The electrochemical element is formed in at least one of a movable region of the surface on the attachment portion side of the electrochemical element and a region of the fixed surface of the attachment portion facing the movable region of the electrochemical element, A circuit part that is disconnected when the element expands;
A power supply apparatus comprising: a detection unit that is connected to the circuit unit and detects disconnection of the circuit unit. An electrochemical element having an element body and an enclosure for enclosing the element body;
A mounting portion having a fixing surface to which the electrochemical element is fixed;
A first circuit part formed in a movable region of the surface of the electrochemical element on the side of the attachment part;
A second circuit portion formed on the fixed surface of the mounting portion and in contact with the first circuit portion;
A power supply apparatus comprising: a detection unit that detects a disconnection between the first circuit unit and the second circuit unit. An electrochemical element having an element body and an enclosure for enclosing the element body;
A mounting portion having a fixing surface to which the electrochemical element is fixed;
A first circuit portion formed on one of a movable region of the surface of the electrochemical element on the attachment portion side and a region of the fixed surface of the attachment portion facing the movable region of the electrochemical element. When,
Formed on the other of the movable region of the surface of the electrochemical element on the side of the attachment portion and the region of the fixed surface of the attachment portion facing the movable region of the electrochemical element, and partially disconnected. A second circuit unit in which the disconnected section is energized by the first circuit unit;
A power supply apparatus comprising: a detection unit that is connected to the second circuit unit and detects disconnection of the second circuit unit. An electrochemical element having an element body and an enclosure for enclosing the element body;
A mounting portion having a fixing surface to which the electrochemical element is fixed;
The electrochemical element is formed in at least one of a movable region of the surface on the attachment portion side of the electrochemical element and a region of the fixed surface of the attachment portion facing the movable region of the electrochemical element, A circuit part that is disconnected when the element expands,
The power supply device, wherein the circuit unit is connected to an electrode of the electrochemical element.   5. The power supply device according to claim 1, wherein the movable region of the surface of the electrochemical element on the attachment portion side is a peripheral region of the surface of the electrochemical element on the attachment portion side.   A fixing surface to which the electrochemical element is fixed when an electrochemical element having an element body and an enclosure for enclosing the element body expands, and a surface on the fixing surface side of the electrochemical element A method for detecting expansion of an electrochemical element, wherein a circuit portion formed on at least one of the electrodes is disconnected and expansion of the electrochemical element is detected.

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