JP2013118071A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module which improves the reliability of information of a battery information management part when the battery module is reused.SOLUTION: A battery module 3 includes electric cells 301, each of which seals a power generation element 115 including an electrolyte in exterior members 113, 114. The battery module 3 includes: a battery information management part including an electronic component which manages information regarding each electric cell 301; and a joining part 6 which joins the battery information management part to a member forming the battery module 3. The joining strength of the joining part 6 is larger than the yield strength of the battery information management part.

Description

  The present invention relates to a battery module.

  A plurality of batteries and a plurality of memories provided corresponding to each of the plurality of batteries and storing deterioration information of each of the plurality of batteries are provided, and the battery shields the pair of electrodes and the pair of electrodes from the outside. A battery pack including an exterior part and having the memory provided inside the exterior part is known (Patent Document 1).

JP 2010-232103 A

  However, in the above battery pack, the specific structures of the memory and the battery are not disclosed, and the memory is removed from the battery pack without damaging the electrodes, power generation elements, or the like included in the battery pack or the memory itself. If the information is exchanged, the reliability of the information stored in the memory cannot be guaranteed.

  The problem to be solved by the present invention is to provide a battery module that improves the reliability of information in the battery information management unit when the battery module is reused.

  The present invention includes a battery information management unit including an electronic component that manages information related to a single cell, and a joint that joins the battery information management unit and a member constituting the battery module, and the joint strength of the joint is determined by the battery information. The above-mentioned problem is solved by making it larger than the yield stress of the management part.

  According to the present invention, when an attempt is made to remove the battery information management unit from the battery module, the battery information management unit is damaged before the battery information management unit is normally removed. As a result, the reliability of the information of the battery information management unit can be improved.

It is a top view of the cell which comprises the battery module which concerns on embodiment of this invention. It is a perspective view of the battery structure which laminated | stacked the cell of FIG. It is a disassembled perspective view of the battery module containing the single battery of FIG. It is a perspective view of the battery module of FIG. 3, and a cover body. It is a fragmentary sectional view which follows the V line of FIG. It is a block diagram of the cell controller of FIG. It is a disassembled perspective view of the battery module which concerns on other embodiment of this invention. It is a fragmentary sectional view which follows the VIII line of FIG. It is a fragmentary sectional view of the battery module concerning other embodiments of the present invention. It is a perspective view of the battery module which concerns on other embodiment of this invention. It is a fragmentary top view of the battery module of FIG. It is a fragmentary sectional view of the battery module concerning other embodiments of the present invention. It is a fragmentary top view of the cell contained in the battery module which concerns on other embodiment of this invention. It is a partial top view of the cell concerning the modification of other embodiments of the present invention. It is a block diagram of the battery module which concerns on other embodiment of this invention, a vehicle controller, a battery controller, and a server. It is a fragmentary top view of the cell contained in the battery module which concerns on other embodiment of this invention. It is a partial top view of the cell concerning the modification of other embodiments of the present invention. It is a partial front view of the cell contained in the battery module which concerns on other embodiment of this invention. FIG. 19 is a sectional view taken along line XIX in FIG. 20 is a cross-sectional view taken along line XX of FIG.

    Hereinafter, embodiments of the invention will be described with reference to the drawings.

<< First Embodiment >>
A flat unit cell 101 included in the battery module of this example will be described with reference to FIG. FIG. 1 shows a plan view of the unit cell 101. The unit cell 101 is a lithium ion-based, flat plate, laminate type secondary battery (thin battery), a positive electrode plate, a separator, a negative electrode plate, a positive electrode terminal 111 (positive electrode terminal), and a negative electrode terminal. 112 (negative electrode terminal), an upper exterior member 113, a lower exterior member 114, and an electrolyte (not shown). Each of the positive electrode plate, the separator, and the negative electrode plate is not limited to one sheet, and may be composed of a plurality of sheets.

  The positive electrode plate, the separator, the negative electrode plate, and the electrolyte constitute the power generation element 115, the positive electrode plate and the negative electrode plate constitute the electrode plate, and the upper exterior member 113 and the lower exterior member 114 constitute a pair of exterior members.

  The positive electrode plate constituting the power generation element 115 includes a positive electrode side current collector extending to the positive electrode terminal 111 and positive electrode layers respectively formed on both main surfaces of a part of the positive electrode side current collector. The positive electrode layer of the positive electrode plate is not formed over both main surfaces of the positive electrode side current collector, but when the power generation element 115 is configured by stacking the positive electrode plate, the separator, and the negative electrode plate. The positive electrode layer is formed only on the portion of the positive electrode plate that substantially overlaps the separator.

  The positive electrode side current collector of the positive electrode plate is made of an electrochemically stable metal foil such as an aluminum foil, an aluminum alloy foil, a copper foil, or a nickel foil. In addition, the positive electrode layer of the positive electrode plate may be, for example, a lithium composite oxide such as lithium nickelate (LiNiO2), lithium manganate (LiMnO2), or lithium cobaltate (LiCoO2), or a chalcogen (S, Se, Te) compound. A mixture of a positive electrode active material such as carbon black and the like, a conductive agent such as carbon black, an adhesive such as an aqueous dispersion of polytetrafluoroethylene, and a solvent. It is formed by applying to, drying and rolling.

  The negative electrode plate constituting the power generation element 115 includes a negative electrode side current collector extending to the negative electrode terminal 112 and negative electrode layers respectively formed on both main surfaces of part of the negative electrode side current collector. The negative electrode layer of the negative electrode plate is not formed over both main surfaces of the negative electrode side current collector, but when the power generating element 115 is formed, the negative electrode plate substantially overlaps the separator. Only the negative electrode layer is formed.

  The negative electrode side current collector of the negative electrode plate is made of an electrochemically stable metal foil such as nickel foil, copper foil, stainless steel foil, or iron foil. In addition, the negative electrode layer of the negative electrode plate is, for example, a negative electrode active material that occludes and releases lithium ions of the positive electrode active material, such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, or graphite. Mixing an aqueous dispersion of styrene butadiene rubber resin powder as a precursor material of an organic fired body, drying and then pulverizing, the carbon material surface carrying carbonized styrene butadiene rubber as the main material, This is formed by further mixing a binder such as an acrylic resin emulsion, applying the mixture to both main surfaces of a part of the negative electrode side current collector, and drying and rolling.

  In particular, when amorphous carbon or non-graphitizable carbon is used as the negative electrode active material, the flatness of the potential during charge / discharge is poor and the output voltage decreases with the amount of discharge. Although unsuitable, it is advantageous when used as a power source for an electric vehicle because there is no sudden drop in output.

  The separator of the power generation element 115 prevents a short circuit between the positive electrode plate and the negative electrode plate described above, and may have a function of holding an electrolyte. The separator 12 is a microporous film made of polyolefin such as polyethylene (PE) or polypropylene (PP), for example. When an overcurrent flows, the pores of the layer are blocked by the heat generation and the current is cut off. It also has a function. The separator according to this example is not limited to a single-layer film such as polyolefin, but a three-layer structure in which a polypropylene film is sandwiched with a polyethylene film, or a laminate of a polyolefin microporous film and an organic nonwoven fabric can also be used. .

  The power generation element 115 described above is formed by laminating a positive electrode plate and a negative electrode plate via a separator. The positive electrode plate is connected to the positive electrode terminal 111 made of metal foil via the positive electrode side current collector, while the negative electrode plate is similarly connected to the negative electrode made of metal foil via the negative electrode side current collector. Each is connected to a terminal 112.

  The positive electrode terminal 111 and the negative electrode terminal 112 are not particularly limited as long as they are electrochemically stable metal materials. As the positive electrode terminal 111, for example, a thickness of about 0.2 mm is used, as in the positive electrode side current collector described above. Aluminum foil, aluminum alloy foil, copper foil, nickel foil, or the like. In addition, as the negative electrode terminal 112, for example, a nickel foil, a copper foil, a stainless steel foil, or an iron foil having a thickness of about 0.2 mm can be used as in the case of the negative electrode side current collector.

  The power generation element 115 described above is housed and sealed in the upper exterior member 113 and the lower exterior member 114. Although not particularly illustrated, the upper exterior member 113 and the lower exterior member 114 of this example are both resistant from the inner side to the outer side of the unit cell 101, such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer. For electrical insulation such as an inner layer composed of a resin film excellent in electrolyte properties and heat-fusibility, an intermediate layer composed of a metal foil such as aluminum, and a polyamide resin or a polyester resin It has a three-layer structure with an outer layer made of an excellent resin film.

  Therefore, both the upper exterior member 113 and the lower exterior member 114 are made of a resin such as polyethylene, modified polyethylene, polypropylene, modified polypropylene, or ionomer on one surface (inner surface of the flat battery) of a metal foil such as an aluminum foil. It is made of a flexible material such as a resin-metal thin film laminate material obtained by laminating and laminating the other surface (the outer surface of the flat battery) with a polyamide resin or a polyester resin.

  These exterior members 13, 14 enclose the power generation element 115, part of the electrode terminal 111 and part of the electrode terminal 112, so that the internal space formed by the exterior members 113, 114 contains an organic liquid solvent. While injecting a liquid electrolyte having a lithium salt such as lithium chlorate, lithium borofluoride or lithium hexafluorophosphate as a solute, the space formed by the exterior members 113 and 114 is sucked into a vacuum state, and then the exterior The outer peripheral edges of the members 113 and 114 are heat-sealed and sealed with a hot press.

  Next, a battery structure in which the unit cells 101 of FIG. 1 are stacked will be described with reference to FIG. FIG. 2 is a perspective view of the unit cell 101 and the unit cell 201.

  The cell 101 shown in FIG. 2 has a plate-like electrode terminal 111 at the end, and a plate-like electrode terminal 112 is provided at the opposite end of the electrode terminal 111 toward the outside of the battery. ing. The electrode terminal 111 has an anode polarity, and the electrode terminal 112 has a cathode polarity. The electrode terminals 111 and 112 in FIG. 2 may be formed by processing the tip portions of the electrode terminals 111 and 112 in FIG. 1, and separate electrodes are connected to the electrode terminals 111 and 112 in FIG. You may form by.

  The spacer 121 and the spacer 122 sandwich the electrode terminal 111, and the spacer 123 and the spacer 124 sandwich the electrode terminal 112. The spacer has an insulating property and maintains the insulating property between the single electrode 101 and the unit cell 201 to be stacked. The output terminal 131 is electrically connected to the electrode terminal 111 and becomes the output terminal 131 of the battery module shown in FIG.

The unit cell 201 is stacked from the upper surface of the unit cell 101. The spacer 221 is a spacer that holds the electrode terminal 211 of the unit cell 201 from above and below, and indicates a lower spacer. The spacer 223 is a spacer that holds the electrode terminal 212 of the unit cell 201 from above and below, and similarly shows a lower spacer. The electrode terminal 211 has a cathode polarity, and the electrode terminal 212 has an anode polarity. When the unit cell 101 and the unit cell 201 are stacked, the electrode terminal 111 and the electrode terminal 211 are electrically connected. Thereby, the unit cell 101 and the unit cell 201 are connected in series and stacked. Therefore, a gap is provided in the stacking direction of the unit cells 101 and 201 in the portion where the spacers 122 and 221 are provided.

  FIG. 2 shows only the state in which the two unit cells 101 and 201 are stacked, but when stacking three or more unit cells, another unit cell is stacked from the upper surface of the unit cell, The electrode terminal of the positive electrode of another unit cell is connected to the electrode terminal 212. Thereby, three unit cells are stacked in series connection.

FIG. 3 is an exploded perspective view showing the battery module 3 according to the present embodiment. FIG. 4 is a perspective view of the battery module 3 and the lid body 4. A single cell 301 of the battery module 3 is obtained by stacking a plurality of single cells 101 and 201 shown in FIG.

  One end of the unit cell 301 is connected to output terminals 131 and 132 of the anode and the cathode, respectively. The insulating cover 302 is attached to the end face side of the unit cell 301 to which the output terminals 131 and 132 are connected, covers the electrode terminal, and maintains insulation between the electrode terminal and the outside of the unit cell. Similarly, the insulating cover 303 is attached to the side opposite to the connection surface of the output terminals 131 and 132 and covers the electrode terminals. The spacers 304 and 305 are formed by stacking the spacers 121 to 124 of FIG. 2 and are arranged between the single cells 301 to fix the single cells 301 at predetermined positions.

The case 360 includes an upper case 361 and a lower case 362. As shown in the drawing, an assembly such as the unit cell 301 is placed in the lower case 362, and the opening of the upper case 361 and the lower case 362 are crimped to form the unit cell 301. And spacers 304, 5 and the like are accommodated. Case 360 is formed of a thin steel plate.

The insertion port 307 is provided in the central portion of the insulating cover 302 and is fitted to the lid 4 described later. When the lid 4 is fitted into the insertion port 307, the unit cell 301 and a cell controller (ADC: Autonomous Decentralized Cell Controller) accommodated in the lid 4 are electrically connected.

  Next, using FIG. 4 and FIG. 5, a joint portion between the insertion port 307 and the lid body 4 in the battery module 3 will be described. FIG. 5 is a partial sectional view taken along line V in FIG.

  The lid 4 has a plate-like plate portion 41 and a cylindrical portion 42 along the side surface of the battery module 3, and is a member that covers a cell controller 5 described later on the side surface of the battery module 3. The cylindrical portion 42 has a rectangular parallelepiped shape with a hollow inside, and includes four surfaces including an upper surface 421 and a lower surface 422. Further, the cylindrical portion 42 extends from the flat portion of the plate portion 41 toward the power generation element 115. The plate portion 41 covers one of the plurality of openings of the tube portion 42, and the plate portion 41 is formed to be larger than the one opening. The plate part 41 and the cylinder part 42 are integrally formed, for example, formed of resin or the like.

  The plate portion 41 has a plurality of cut portions 41a. The cut portion 41a is formed by making a cut (perforation) in a part of the plate portion 41. The thickness of the portion where the cut portion 41a is formed is the same as that of the other plate portion 41 where the cut portion 41a is not formed. It becomes smaller than the thickness. The cut portion 41 a is cut out from the inner surface of the plate portion 41 (the surface facing the inner side of the battery module 3) toward the inside of the plate portion 41.

  The upper surface 421 and the lower surface 422 have a convex portion 421b and a convex portion 422b, respectively. The convex portions 421b and 422b are shaped to fit into the concave portion 302c of the insulating cover 302. The convex portion 421b has a shape protruding from a flat surface portion of the upper surface 421, and has an inclined surface on the insertion direction side of the lid 4 and a vertical surface perpendicular to the flat surface portion on the opposite side to the insertion direction. Have. The convex part 422b has the same shape as the convex part 421b.

  The recessed portion 302 c is formed in the insertion port 307 in the insulating cover 302, and is formed in a shape recessed from the inner surface of the insertion port 307 toward the inside of the insulating cover 302. The concave portion 302c has a shape that engages with the convex portions 421b and 422b, and serves as a member that locks the convex portions 421b and 422b. The concave portion 302c has a slope corresponding to the slope of the convex portions 421b and 422b and a vertical surface corresponding to the vertical surface of the convex portions 421b and 422b.

  The cylindrical portion 42 is formed so as to match the shape of the insertion port 307, and the plate portion 41 covers the opening portion of the insertion port 307 when the lid 4 is completely inserted into the insertion port 307. It becomes like this. Further, the convex portions 421b and 422b engage with the concave portion 302c. Since the convex portions 421b, 422b and the concave portion 302c have the inclined surface and the vertical surface as described above, the lid body cannot be detached from the insertion port 307 while the lid body 4 can be attached to the insertion port 307. It becomes the structure to do. Therefore, after the lid 4 is completely inserted into the insertion port 307, the lid 4 has a structure that cannot be removed from the insertion port 307 unless the lid 4 or the like is damaged.

  A cell controller 5 is provided inside the lid body 42. The cell controller 5 has a substrate and electronic components (not shown) mounted on the substrate. The cell controller 5 is a management unit that manages information related to the unit cell 301. For example, the cell controller 5 has a function of measuring the state of the unit cell 301 by detecting the voltage of the unit cell 301 included in the battery module 1, and the unit cell. 301 or a function of storing identification information assigned to each battery module 1, a function of adjusting the capacity of the unit cell by charging or discharging the unit cell 301, and the like. The identification information of the cell 301 or the battery module 1 is one of the credit information of the cell 301 or the battery module 3. The credit information includes deterioration information and usage history information of the unit cell 301 or the battery module 3, or information indicating that the unit cell 301 or the battery module 3 is genuine, and the credit information is also stored in the cell. It may be managed by the controller 5.

  Here, a basic configuration of the cell controller 5 will be described with reference to FIG. FIG. 6 is a block diagram of the cell controller 5. The cell controller 5 includes a calculation unit 501, a sensor 502, a switch (SW) 503, a memory 504, and a communication unit 505. The calculation unit 501 includes a CPU and the like, is a central part of the control unit of the cell controller 5, and calculates and manages the capacity of the battery 301 from the detection value of the sensor 502. The sensor 502 is electrically connected between the terminals of the unit cell 301, and is composed of, for example, a voltage sensor.

  The switch 503 is a capacity adjustment switch and is connected between the terminals of the unit cell 301. The cell controller 5 adjusts the capacity of the unit cell 301 by turning on the switch to cause the unit cell 301 and a capacity adjustment resistor (not shown) to conduct, and discharging the unit cell 301. The memory 504 is a storage unit that stores information related to the single battery 301 managed by the cell controller 301, such as identification information, capacity information, and deterioration information. The communication unit 505 is a communication unit that transmits information related to the unit cell 301 such as information stored in the memory 504 and information managed by the calculation unit 501 and receives signals from the outside.

  Returning to FIG. 5, the cell controller 5 is powered from the unit cell 301. That is, when the lid 4 is inserted into the insertion port 307, electrical continuity between the cell controller 5 and the single battery 301 is ensured. Although detailed illustration is omitted, for example, when a terminal for powering the cell controller 5 is provided and the lid 4 is inserted into the insertion port 307, the terminal and the electrode terminals 111, 112, 211, 212 Should be in contact.

  The cell controller 5 is composed of a plurality of plate-like substrates so as to follow the shape inside the lid 4. The plurality of substrates include a substrate 51 having a shape along the upper surface 421, a substrate 52 having a shape along the lower surface 422, and a substrate 53 having a shape along the plate portion 41. These substrates are integrally formed. In addition, cut portions 51 a are formed in connection portions between the substrate 51 and the substrate 53 and connection portions between the substrate 52 and the substrate 53, in other words, corner portions of the substrates 51 to 53 of the cell controller 5. The cut portion 51a is formed by making a cut (perforation) in a part of the substrates 51 to 53, and the thickness of the portion where the cut portion 51a is formed is different from that of the other substrate 51 to which the cut portion 51a is not formed. It becomes smaller than the thickness of 53.

  The upper surface 421 and the substrate 51 are bonded by a bonding portion 61, the lower surface 422 and the substrate 52 are bonded by a bonding portion 62, and the plate portion 41 and the substrate 53 are bonded by a bonding portion 63. . The joining parts 61 to 63 are parts that join the members by welding such as an adhesive or solder, screwing, riveting, welding, or the like. In FIG. 5, the joint portions 61 to 63 are illustrated for the sake of clarity, but in actuality, the sizes are negligible with respect to the sizes of the cell controller 5 and the lid body 4. .

  The joint strength between the lid 4 and the cell controller 5 by the joints 61 to 63 is designed to be greater than the yield stress of the substrates 51 to 53 or the yield stress of the lid 4. In this example, the notches 41 a are formed in the lid 4, and the notches 51 a are formed in the cell controller 5, thereby reducing the rigidity of the lid 4 and the cell controller 5. Here, the yield stress is the stress at the yield point corresponding to the boundary between the elastic region and the plastic region in the stress strain diagram of the member. That is, when a stress smaller than the yield stress is applied to the member, the shape of the member is maintained due to the elasticity of the member, but when a stress exceeding the yield stress is applied to the member, the member becomes plastic and the member is strained. Will remain.

  In this example, the yield stress of the substrates 51 to 53 is determined at the design stage depending on the material used for the substrates 51 to 53 and the shape of the substrates 51 to 53. Moreover, as shown in FIG. 5, the magnitude | size of a yield stress may be set by providing the notch part 51a in the board | substrates 51-53. When a stress equal to or higher than the yield stress is applied to the substrates 51 to 53 and strain remains in the substrates 51 to 53, the substrates 51 to 53 are damaged, and the cell controller 5 does not function normally.

  The bonding strength represents the bonding strength between the contacting interfaces in the structures of the bonding portions 61 to 63 or the convex portions 421b and 422b and the concave portion 302. The bonding strength is a value determined at the design stage depending on the material of the bonding portions 61 to 63 and the shapes of the bonding portions 61 to 63, the convex portions 421 b and 422 b, and the concave portion 302.

  Next, as shown in FIG. 5, a state in which the lid body 4 is forcibly removed from the insertion port 307 from a state where the lid body 4 is inserted into the insertion port 307 and fitted to each other will be described. Such a state is a state that can occur when the battery module 3 is illegally reused. Unauthorized use includes, for example, rewriting information stored in the memory 504 or illegally replacing the cell controller 5 itself with another controller. As described above, since the information of the unit cell 301 is managed by the cell controller 5 provided in the lid 4, the cell controller 5 is extracted from the battery module 3 when the battery module 3 is illegally used. Is assumed.

  In this example, when the lid 4 is removed from the insertion port 307, the stress applied from the outside is caused by the structural portions of the convex portions 421b, 422b and the concave portion 302b, the joint portions 61-63, the lid body 4 and the cell controller. Join 5 Since the joint strength at the structural portion between the convex portions 421b and 422b and the concave portion 302 is larger than the yield stress of the lid body 4, the plate portion is first formed by the cut portion 51a while maintaining the joint state between the convex portions 421b and 422b and the concave portion 302. 41 is damaged, and the plate portion 41 is separated from the upper surface portion 421 and the lower surface portion 422. At this time, since the bonding strength of the bonding portions 61 to 63 is greater than the yield stress of the lid body 4, the bonding state between the lid body 4 and the cell controller 5 is maintained.

  Further, when the plate portion 41 is to be taken out from the insertion port 307, the substrate 53 is pulled in the direction to be taken out by the plate portion 41 through the joint portion 63. On the other hand, the substrates 51 and 52 are bonded to the cylindrical portion 42 via the bonding portions 61 and 62. Therefore, stress concentrates on the corners of the substrates 51 to 53. In this example, the notch 51a is provided in the corner, and since the yield stress of the cell controller 5 is smaller than the joint strength of the joints 61 to 63, the corner is broken and the cell controller 5 is damaged. As a result, in this example, if the cell controller 5 is removed from the battery module 3 for unauthorized use, the cell controller 5 is damaged, and thus unauthorized use of the battery module 3 may be disabled. it can.

  As described above, in this example, the cell controller 5 and the insulating cover 302 which is a member constituting the battery module 3 are joined at the joint portions of the joint portions 61 to 63 and the concave portions 302c and the convex portions 421b and 422b. The joint strength of the joint portion is made larger than the yield stress of the cell controller 5. As a result, if the cell controller 5 is to be removed from the battery module 3, the cell controller 5 is damaged while maintaining the joined state of the joined portion. Information can not be handled, and unauthorized re-use of the battery module 3 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 301 and the cell controller 5 are reused as a set can be improved.

  In addition, in this example, the cell controller 5 can be attached to the insertion port 307 by forming a joint structure between the insulating cover 302 and the lid body 4 having the cell controller 5 by a concave portion 302c and convex portions 421b and 422b. Thus, the cell controller 5 cannot be removed from the insertion port 307. As a result, if the cell controller 5 is to be removed from the battery module 3, the cell controller 5 is damaged while maintaining the joined state of the joined portion, so that unauthorized reuse of the battery module 3 can be prevented. As a result, the reliability of information of the cell controller 5 can be improved.

  Further, in this example, the notch 41a or the notch 51a is provided in the lid 4 or the cell controller 5. Thereby, since the yield stress of the lid 4 or the cell controller 5 can be reduced, when the cell controller 5 is to be removed from the battery module 3, the cell controller 5 or The lid body 4 is damaged, and unauthorized reuse of the battery module 3 can be prevented.

  Further, in this example, the lid 4 and the insulating cover 302 are joined with a joint structure by the concave portions 302c and the convex portions 421b and 422b, and the lid 4 and the cell controller 5 are joined by joint portions 61 to 63. To do. Thereby, when it is going to remove the cover body 4 from the battery module 3, the joined state between the cover body 4 and the insulating cover 302 and the joined state between the cover body 4 and the cell controller 5 are maintained. Thus, since the lid 4 and the cell controller 5 are damaged, unauthorized reuse of the battery module 3 can be prevented.

  In this example, the lid 4 is joined to the insulating cover 302 via the joint structure of the concave portion 302c and the convex portions 421b and 422b. However, the lid 4 is not necessarily joined to the insulating cover 302. For example, the spacer 304 You may join to the other member which comprises the battery module 3, such as. At this time, the other member may be processed to have a shape corresponding to the recess 302c. Further, the positions of the concave portion 302c and the convex portions 421b and 422b may be reversed.

  The cell controller 5 corresponds to the “battery information management unit” according to the present invention, and the joint portion of the concave portion 302c and the convex portions 421b and 422b and the joint portions 61 to 63 correspond to the “joint portion”. The joint portions of the convex portions 421b and 422b correspond to “first joint portions”, and the joint portions 61 to 63 correspond to “second joint portions”.

<< Second Embodiment >>
7 is an exploded perspective view of a battery module 3 according to another embodiment of the invention, and FIG. 8 is a partial cross-sectional view taken along line VIII of FIG. In this example, a part of the configuration of the side surface portion of the battery module 3 is different from the first embodiment described above. Since the configuration other than this is the same as that of the first embodiment described above, the description thereof is incorporated as appropriate.

  The cell controller 5 and the lid 4 are inserted into the insertion port 307 of the insulating cover 302 before the cell 301 is accommodated in the upper case 361 and the lower case 362 and crimped, and the case 360 301, the lid 4 and the cell controller 5 are accommodated.

  The lid body 4 is formed in a shape such that the size of the cross section perpendicular to the insertion direction of the lid body 4 gradually decreases along the insertion direction, and has a shape that can be easily inserted into the insertion port 307. Yes. The shape of the side surface of the lid 4 is formed so as to follow the shape of the opening of the insertion port 307. When the lid body 4 is completely inserted into the insertion port 307, the side surface of the lid body 4 enters more inside than the outer surface of the insulating cover 302. For this reason, when the lid 4 is inserted into the insertion port 307, it is difficult to remove the lid 4 from the insertion port 307.

  A convex portion 302 a is formed on the surface of the insertion port 307 of the insulating cover 302. The convex portion 302a has a vertical surface perpendicular to the surface of the insertion port 307 on the insertion direction side of the lid 4 and the cell controller 5, and an inclined surface on the opposite side to the insertion direction.

  The cell controller 5 is formed in a plate shape and is formed along the shape of the insertion port 307. The cell controller 5 is joined to the spacer 304 via the joint 6. The cell controller 5 is connected to a positive electrode terminal 311, a negative electrode terminal 312, and a voltage detection detection terminal (not shown) by wiring 8. Note that the detection terminal is electrically connected to the unit cell 301. As a result, the cell controller 5 is driven by the electric power from the single battery 301 and detects the voltage of the single battery 301 via the detection terminal.

  When the cell controller 5 is inserted into the insertion port 307, the width of the cell controller 5 is longer than the interval between the convex portions 302a, so that it is locked inside the insulating cover 302 by the convex portions 302a. When the cell controller 5 is inserted into the insertion port 307, it can be attached to the insertion port 307 by the inclined surface of the recess 302a. On the other hand, when trying to remove the cell controller 5 from the insertion port 307, it cannot be easily removed from the insertion port 307 due to the vertical surface of the recess 302a. Thereby, the joint strength with the cell controller 5 in the convex part 302a becomes larger than the yield stress of the cell controller 5. In addition, the bonding strength of the bonding portion 6 is greater than the yield stress of the cell controller 5. The cell controller 5 is covered with a lid 4, and the lid 4 is covered with a case 360. Note that a joint may be provided between the lid 4 and the case 360.

  Next, as shown in FIG. 8, the cell controller 5 is inserted into the insertion port 307, the lid 4 is inserted into the insertion port 307, and the unit cell 301 is housed in the case 360 (battery module 3 A case where the cell controller 5 is forcibly removed from the insertion port 307 will be described.

  Since the cell controller 5 and the lid 4 are accommodated in the case 360, it is necessary to separate the upper case 361 and the lower case 362. Then, the lid 4 is removed from the insertion port 307. When an attempt is made to remove the cell controller 5 from the battery module 3, external stress is applied to the convex portion 302 a, the joint portion 6, and the cell controller 5. Since the joint strength of the convex portion 302a and the joint portion 6 is larger than the yield stress of the cell controller 5, the cell controller 5 is damaged while the joint state by the convex portion 302a and the joint portion 6 is maintained. As a result, in this example, when the cell controller 5 is to be removed from the battery module 3 for unauthorized use, the cell controller 5 is damaged, and the unauthorized use of the battery module 3 can be made impossible.

  As described above, in this example, the cell controller 5 can be attached to the insertion port 307 by the convex portion 302a, the cell controller 5 cannot be removed from the insertion port 307, and the spacer 304 and the cell controller 5 are connected by the joint portion 6. And join. As a result, if the cell controller 5 is to be removed from the battery module 3, the cell controller 5 is damaged while maintaining the joined state of the joined portion. Information can not be handled, and unauthorized re-use of the battery module 3 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 301 and the cell controller 5 are reused as a set can be improved.

  Said convex part 302a is equivalent to the "1st junction part" which concerns on this invention, and the junction part 6 is equivalent to the "2nd junction part" of this invention.

<< Third Embodiment >>
FIG. 9 is a partial cross-sectional view of a battery module 3 according to another embodiment of the invention. In this example, a part of the configuration of the side surface portion of the battery module 3 is different from the first embodiment described above. Since the configuration other than this is the same as that of the first embodiment described above, the descriptions of the first embodiment and the second embodiment are incorporated as appropriate.

  The spacer 304 is configured by laminating a plurality of spacers, and the central portion of the laminated body of the spacers 304 is wider in the planar shape of the laminated surface than the laminated body of the spacers 304 of other parts, and the battery module The shape is drawn toward the side surface 3.

  The substrate 51 of the cell controller 5 is bonded to the upper case 361 via the bonding portion 61. The substrate 52 of the cell controller 5 is bonded to the drawing portion of the spacer 304 through the bonding portion 62. The substrate 53 of the cell controller 5 is bonded to the lower case 362 via the bonding portion 63. The joint strength of the joints 61 to 63 is greater than the yield stress of the cell controller 5.

  Next, the case where the cell controller 5 is forcibly removed from the insertion port 307 from the state where the cell controller 5 is joined to the case 360 at the joint 6 and the unit cell 301 is accommodated in the case 360 will be described.

  Since the cell controller 5 and the lid 4 are accommodated in the case 360, it is necessary to separate the upper case 361 and the lower case 362. When the caulking portion is removed and the upper case 361 and the lower case 362 are to be disassembled, external stress is applied to the joint 6 and the cell controller 5. Since the joint strength of the joint portion 6 is greater than the yield stress of the cell controller 5, the cell controller 5 is damaged while the state in which the cell controller 5 is joined to the case 360 and the spacer 304 by the joint portion 6 is maintained. As a result, in this example, when the cell controller 5 is to be removed from the battery module 3 for unauthorized use, the cell controller 5 is damaged, and the unauthorized use of the battery module 3 can be made impossible.

  As described above, in this example, the cell controller 5 and the inner surface of the case 360 and the spacer 304 which are members constituting the battery module 3 are joined by the joining portion 6. As a result, if the cell controller 5 is to be removed from the battery module 3, the cell controller 5 is damaged while maintaining the joined state of the joined portion. Information can not be handled, and unauthorized re-use of the battery module 3 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 301 and the cell controller 5 are reused as a set can be improved.

  In this example, the cell controller 5 is joined to the spacer 304 and the case 360 by the joining portion 6, but may be joined to either the spacer 304 or the case 360.

  The joint portions 61 and 63 correspond to a “first joint portion” according to the present invention, and the joint portion 62 corresponds to a “second joint portion”.

<< 4th Embodiment >>
10 is a perspective view of a battery module 3 according to another embodiment of the invention, and FIG. 11 is a partial plan view of FIG. In this example, a part of the configuration of the side surface portion of the battery module 3 is different from the first embodiment described above. Since the configuration other than this is the same as that of the first embodiment described above, the description of the first to third embodiments is incorporated as appropriate.

  In addition to the output terminals 131 and 132, an output terminal 133 for detecting the voltage of the unit cell 301 is provided between the output terminal 131 and the output terminal 132 on the side surface of the battery module 3.

  A cell controller 5 is provided on the outer end surfaces of the output terminals 131 to 133. The cell controller 5 has a plate-like substrate 51 and an electronic component 54. The substrate 51 is formed to connect the output terminal 131 and the output terminal 132. The substrate 51 is provided with an insertion hole to be inserted into the distal end portion of the output terminals 131 and 132. The electronic component 54 is a chip corresponding to the arithmetic unit 501 shown in FIG. The electronic component 54 is connected to the output terminals 131 to 133 by the wiring 7. The electronic component 54 is provided between the substrate 51 and the case 306. The substrate 51 is provided with a plurality of cut portions 51a.

  The bonding portion 61 bonds the substrate 51 and the output terminal 131, the bonding portion 62 bonds the substrate 51 and the output terminal 132, and the bonding portion 63 bonds the substrate 51 and the output terminal 133. The bonding strength of the bonding portion 6 is greater than the yield stress of the substrate 51.

  Next, the case where the cell controller 5 is forcibly removed from the output terminals 131 to 133 from the state where the cell controller 5 is joined to the output terminals 131 to 133 at the joint 6 will be described.

  In order to remove the cell controller 5, the cell controller 5 is pulled, so that external stress is applied to the cell controller 5 and the joints 61 to 63. Since the bonding strength of the bonding portions 61 to 63 is greater than the yield stress of the cell controller 5, the substrate 51 is cut while the state where the substrate 51 is bonded to the output terminals 131 to 133 via the bonding portions 61 to 63 is maintained. The cell controller 5 is broken by being torn from the portion 51a. As a result, in this example, when the cell controller 5 is to be removed from the battery module 3 for unauthorized use, the cell controller 5 is damaged, and the unauthorized use of the battery module 3 can be made impossible.

  As described above, in this example, the substrate 51 and the output terminals 131 to 133 are joined by the joining portions 61 to 63, and the electronic component 54 is provided between the case and the substrate 51. As a result, if the cell controller 5 is to be removed from the battery module 3, the cell controller 5 is damaged while maintaining the joined state of the joined portion. Information can not be handled, and unauthorized re-use of the battery module 3 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 301 and the cell controller 5 are reused as a set can be improved.

  The output terminals 131 to 133 correspond to “terminal portions” according to the present invention.

<< 5th Embodiment >>
FIG. 12 is a partial cross-sectional view of a battery module 3 according to another embodiment of the invention. In this example, the shapes of the lid and the insertion port are different from those of the second embodiment described above. Other configurations are the same as those of the second embodiment described above, and the descriptions of the first to fourth embodiments are incorporated as appropriate.

  On the surface of the insertion port 307, the convex portion 302a like the insertion port 307 according to the second embodiment is not formed. The lid 4 is made of a thermosetting resin and covers the cell controller 5. After the cell controller 5 is joined to the spacer 304 at the joint 6, the lid body 4 is poured into the insertion port 307, and the cell controller 5 and the insertion port 307 are utilized by utilizing the characteristics of the thermosetting resin of the lid body 4. And the cover body 4 joins the cell controller 5 by integrating the case 360. Thereby, when trying to remove the cell controller 5 from the battery module 3 illegally, the operator cannot touch the cell controller 5 unless at least one of the cell controller 5 and the battery module 3 is broken. . As a result, unauthorized reuse of the battery module 3 and the cell controller 5 can be prevented.

  As described above, in this example, the lid 4 of the thermosetting resin fills the insertion port 307 with the lid 4 while covering the cell controller 5 from the side surface of the case 360. As a result, when the cell controller 5 is to be removed from the battery module 3, the lid 4 must be damaged, and when the lid 4 is destroyed, the cell controller 5 integrated with the lid 4 is damaged. Therefore, the cell controller 5 can be disabled or the information in the cell controller 5 cannot be handled, and unauthorized reuse of the battery module 3 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 301 and the cell controller 5 are reused as a set can be improved.

<< 6th Embodiment >>
FIG. 13 is a partial plan view of a unit cell included in a battery module according to another embodiment of the invention. In this example, the point which joins the cell controller 5 on the electrode terminal 111 differs from 1st Embodiment mentioned above. Other configurations are the same as those of the first embodiment described above, and the descriptions of the first to fifth embodiments are incorporated as appropriate.

  In the unit cell 101 according to the first embodiment, the electrode terminal 111 and the electrode terminal 112 are drawn out from the exterior members 113 and 114 in opposite directions, but in this example, as shown in FIG. Terminals 111 and electrode terminals 112 are drawn out.

  The substrate 51 of the cell controller 5 is provided on the surface of the positive electrode terminal 111, and the substrate 51 is bonded to the electrode terminal 111 by a plurality of bonding portions 61. A part of the substrate 51 enters the exterior member 113 and is sandwiched between the upper exterior member 113 and the lower exterior member 114. The joint portion 65 is a portion that is heat-sealed between the upper exterior member 113 and the lower exterior member 114, and a portion that joins a part of the substrate 51 between the upper exterior member 113 and the lower exterior member 113. Become.

  Further, the electrode terminal 111 is provided with a cut portion 111 a at the lower portion of the substrate 51. The cut portion 111 a is formed by making a cut (perforation) in the electrode terminal 111. The notch 111a is provided to reduce the yield stress of the electrode terminal 111. The bonding strength between the substrate 51 and the electrode terminal 111 by the bonding portion 61 and the bonding strength between the exterior members 113 and 114 and the substrate 51 by the bonding portion 65 are larger than the yield stress of the substrate 51. It is comprised so that it may become larger than the yield stress of the electrode terminal 111.

  The electronic component 54 is electrically connected to the positive electrode of the unit cell 101 by providing the substrate 51 on the electrode terminal 111. On the other hand, with respect to conduction to the negative electrode side, the wiring 7 connected to the substrate 51 is connected between the exterior member 113 and the exterior member 114 corresponding to the joint portion 65 and connected to the electrode terminal 112 on the negative electrode side. .

  Next, the case where the cell controller 5 is removed from the state in which the cell controller 5 is bonded to the electrode terminal 111 and the exterior members 113 and 114 at the bonding portion 61 and the bonding portion 65 will be described.

  In order to remove the cell controller 5, the cell controller 5 is pulled, so that external stress is applied to the cell controller 5, the joint portions 61 and 65, the electrode terminal 111, and the exterior members 113 and 114. Since the bonding strength of the bonding portions 61 and 65 is greater than the yield stress of the cell controller 5 and the electrode terminal 111, the substrate 51 is bonded to the electrode terminal 111 and the exterior members 113 and 114 via the bonding portions 61 and 65. The substrate 51 is damaged while maintaining. Moreover, since the notch 111a is provided in the electrode terminal 111, the electrode terminal 111 is also damaged. As a result, in this example, when the cell controller 5 is to be removed from the battery module 3 for unauthorized use, the cell controller 5 and the electrode terminal 111 are damaged, making unauthorized use of the battery module 3 impossible. be able to.

  As described above, in this example, the cell controller 5 is provided on the surface of the electrode 111 via the junction 61. Accordingly, in this example, the bonding strength of the bonding portion 61 is larger than the yield stress of the cell controller 5, and the cell controller 5 is damaged when the cell controller 5 is removed from the electrode terminal 111. It is possible to enter a disabled state or a state in which information in the cell controller 5 cannot be handled, and unauthorized reuse of the battery module 3 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 101 and the cell controller 5 are reused as a set can be improved.

  In this example, the notch 111 a is provided in the electrode terminal 111, and the joint strength of the joint 61 is greater than the yield stress of the electrode terminal 111. As a result, if the cell controller 5 is removed from the electrode terminal 111, the electrode terminal 111 is damaged, so that the unit cell 101 can be disabled, and unauthorized reuse of the battery module 3 can be prevented. Can do. As a result, the reliability of the information of the cell controller 5 when the unit cell 101 and the cell controller 5 are reused as a set can be improved.

  In this example, the cell controller 5 is joined between the exterior member 113 and the exterior member 114 via the joint portion 65. Thereby, in this example, since the joint strength of the joint portion 65 is larger than the yield stress of the cell controller 5, and the cell controller 5 is damaged when the cell controller 5 is removed from the exterior members 113 and 114, the cell controller 5 Can not be used or information in the cell controller 5 can not be handled, and unauthorized reuse of the battery module 3 can be prevented. As a result, the reliability of information of the cell controller 5 can be improved.

  In this example, the cell controller 5 may be electrically connected to the electrode terminal 111 and the electrode terminal 112 with the configuration shown in FIG. 14 instead of the wiring 7. FIG. 14 is a partial plan view of a unit cell 101 according to a modification of the present embodiment.

  As shown in FIG. 14, the substrate 51 is designed to have a length from the electrode terminal 111 to the electrode terminal 112, joined to the electrode terminal 111 via the joint 61, and connected to the electrode terminal 112 via the joint 62. It is joined to. The bonding strength of the bonding portions 61 and 62 is greater than the yield stress of the substrate 51. As a result, when the single battery 101 tries to remove the cell controller 5, the substrate 51 is damaged before the substrate 51 is removed from the electrode terminals 111 and 112, so that the cell controller 5 cannot be used or the cell controller 5. The information in the battery module 3 cannot be handled, and unauthorized reuse of the battery module 3 can be prevented. The electrode terminals 111 and 112 may be provided with a cut portion 111a.

  In this example, the substrate 51 may be bonded to either the electrode 111 or the exterior members 113 and 114 in either the bonding portion 61 or the bonding portion 65. The cell controller 5 may be provided on the surface of the negative electrode terminal 112.

  The electrode terminal 111 corresponds to the “electrode” according to the present invention.

<< 7th Embodiment >>
FIG. 15 is a block diagram of a battery module, a vehicle controller, a battery controller, and a server according to another embodiment of the invention. This example differs from the first embodiment described above in that the communication unit 505 is provided outside the case 360. Other configurations are the same as those of the first embodiment described above, and the descriptions of the first to sixth embodiments are incorporated as appropriate.

  The battery module 3 includes the single cell 301 and the cell controller 5 inside the case 360, and the communication unit 505 outside the case 360. The cell controller 5 manages information related to the cell 301 and transmits the information from the communication unit 505 to the outside. The communication unit 505 communicates with the communication unit 505 of the other battery module 3 and transmits / receives information of each single battery 301 to / from each other. The communication unit 505 communicates with the vehicle controller 81, the battery controller 82, and the server 83, and transmits information managed by the cell controller 5.

  The vehicle controller 81 is a control unit that is provided in the vehicle and controls the entire vehicle. The battery controller 82 is a control unit that controls each battery module 3. For example, the vehicle controller 81 controls the battery modules 3 so as to output from each battery module 3 electric power for outputting a torque requested from the outside by a motor (not shown) based on a signal from an accelerator sensor (not shown). . The battery controller 82 controls the entire battery mounted on the vehicle based on information managed by each cell controller 5.

  The server 83 functions as an authentication server that manages each battery module 3. Information for authentication is assigned to the battery module 3 to prevent unauthorized reuse, and the authentication information is stored in the cell controller 5 and the server 3. Then, the server 83 determines whether or not the cell controller has been illegally reused based on the authentication information transmitted from the communication unit 505.

  As described above, in this example, the communication unit 505 is provided outside the case 360, and information managed by the cell controller 5 is transmitted to the outside by the communication unit 505. Accordingly, at least a part (such as a receiver or a connector connected to the communication wiring) that communicates in the communication unit 505 can be exposed outside the case 360, so that communication can be easily performed.

  Note that the communication of the communication unit 505 may be wireless communication or wired communication.

<< Eighth Embodiment >>
FIG. 16 is a partial plan view of a unit cell included in a battery module according to another embodiment of the invention. In this example, the connection part of the board | substrate 51 and the power terminal 111, the shape of the board | substrate 51, etc. differ with respect to 6th Embodiment mentioned above. The other configuration is the same as that of the above-described sixth embodiment, and the description of the first to seventh embodiments is incorporated as appropriate.

  A substrate 51 of the cell controller 5 is provided on the surface of the positive electrode terminal 111. The width of the substrate 51 is larger than the width of the electrode terminal 111. A plurality of electronic components 54 are mounted on the substrate 51. A part of the substrate 51, a part where the electronic component 54 is not mounted, enters the exterior members 113 and 114, and is sandwiched between the upper exterior member 113 and the lower exterior member 114. The joining portion 65 is a portion that is heat-sealed between the upper exterior member 113 and the lower exterior member 114, and is a portion that joins a part of the substrate between the upper exterior member 113 and the lower exterior member 114. .

  The upper exterior member 113 and the lower exterior member 114 sandwich the substrate 51 and the electrode terminal 111 so as to avoid the electronic component 54 so that the electronic component 54 is not damaged by heat or pressure due to heat fusion of the joint 65. While being heat-sealed.

  The substrate 51 and the electrode terminal 111 are connected by the wiring 71 in the exterior members 113 and 114. In addition, the substrate 51 and the electrode terminal 112 are connected by the wiring 72 in the exterior member 113. A connection point between the wiring 72 and the substrate 51 is provided in a portion where the electrode terminal 111 and the substrate 51 do not overlap. The wiring 72 is connected to the substrate 51 so as not to overlap with the electrode terminal 111 of the positive electrode because the wiring 72 is a wiring on the positive electrode side and the counter electrode side (negative electrode side) to which the cell controller 5 is attached.

  When heat bonding is performed at the joint portion 65, the substrate 51, the electrode terminal 111, and the exterior members 113 and 114 are integrated, and the cell controller 5 is sealed by the exterior members 113 and 114. The bonding strength at the bonding portion 65 is larger than the yield stress of the substrate 51.

  Next, the case where the cell controller 5 is removed from the state in which the cell controller 5 is joined to the electrode terminal 111 and the exterior members 113 and 114 at the joint portion 65 will be described.

  In order to remove the cell controller 5, the cell controller 5 is pulled, and external stress is applied to the cell controller 5, the joint portion 65, the electrode terminal 111, and the exterior members 113 and 114. Since the bonding strength of the bonding portion 65 is greater than the yield stress of the cell controller 5 and the electrode terminal 111, while maintaining the state where the substrate 51 is bonded to the electrode terminal 111 and the exterior members 113 and 114 via the bonding portion 65, The substrate 51 is damaged. As a result, in this example, when the cell controller 5 is to be removed from the battery module 3 for unauthorized use, the cell controller 5 is damaged, and the unauthorized use of the battery module 3 can be made impossible.

  As described above, in this example, at least a part of the cell controller 5 (the part of the substrate 51 where the electronic component 54 is not mounted) is sealed in the exterior members 113 and 114. As a result, when the cell controller 5 is to be removed from the unit cell 101, the cell controller 5 is damaged when the sealing portions of the exterior members 113 and 114 are peeled off. The information in the cell controller 5 cannot be handled, and unauthorized reuse of the unit cell 101 can be prevented. As a result, the reliability of the information of the cell controller 5 when the unit cell 101 and the cell controller 5 are reused as a set can be improved.

  In this example, the cell controller 5 is provided on the surface of the electrode terminal 111, and the electrode terminal 111 and the cell controller 5 are sealed with exterior members 113 and 114. As a result, when the cell controller 5 is to be removed from the unit cell 101, the cell controller 5 or at least one of the electrode terminals 111 is damaged when the sealing portions of the exterior members 113 and 114 are peeled off. 5 can not be used or information in the cell controller 5 can not be handled, or the function as the unit cell 101 can not be performed, the unauthorized use of the unit cell 101 and the cell controller 5 Can be prevented. As a result, the reliability of information of the cell controller 5 can be improved.

  Note that the cell controller 5 may be provided between the electrode terminal 111 and the electrode terminal 112 as shown in FIG. FIG. 17 is a partial plan view of a unit cell 101 according to a modification of the present embodiment.

  The cell controller 5 is provided in a joint portion 65 that is a heat-sealed portion between the exterior member 113 and the exterior member 114. The cell controller 5 is formed of a plate-like substrate 51, on which electronic components are mounted. One end of the cell controller is provided on the surface of the electrode terminal 111, and the other end of the cell controller is provided on the surface of the electrode terminal 112. One end of the cell controller is electrically connected to the electrode terminal 111, and the other end of the cell controller is electrically connected to the electrode terminal 112.

  In addition, in the battery module 3 according to the above modification, the electronic component of the cell controller 5 has a heat-resistant material or the like on the surface of the electronic component in order to avoid the influence of heat at the time of heat fusion at the joint portion 65. You may take measures against heat, such as coating.

  As described above, in this example, the cell controller 5 is provided between the positive electrode terminal 111 and the negative electrode terminal 112 and sealed with the exterior members 113 and 114. As a result, if the cell controller 5 is removed from the unit cell 101, the cell controller 5 is damaged, so that the cell controller 5 cannot be used or the information in the cell controller 5 cannot be handled. Unauthorized reuse of the unit cell 101 can be prevented. As a result, the reliability of information of the cell controller 5 can be improved.

<< Ninth Embodiment >>
18 is a partial front view of a unit cell included in a battery module according to another embodiment of the invention, FIG. 19 is a sectional view taken along line XIX in FIG. 18, and FIG. 20 is a sectional view taken along line XX in FIG. . In this example, the sealing parts of the exterior members 113 and 114 are different from the modification of the sixth embodiment described above (see FIG. 17). The other configuration is the same as that of the above-described eighth embodiment, and the description of the first to eighth embodiments is incorporated as appropriate.

  The cell controller 5 is provided between the electrode terminal 111 and the electrode terminal 112. The periphery of the cell controller 5 is sealed with a joint portion 66 that is a heat-sealed portion between the exterior member 113 and the exterior member 114. With respect to the cell controller 5, the exterior member 113 on the power generation element 115 side and the exterior member 114 are sealed with a joint portion 66, and with respect to the cell controller 5, the exterior member 113 and the exterior member outside the unit cell 101 are sealed. 114 is sealed with a joint 66.

  As shown in FIGS. 19 and 20, the joining portion 66 has a sealing portion 66 a that seals the power generation element 115 and a sealing portion 66 b that seals the outer periphery of the unit cell 101. doing. The cell controller 5 is disposed between the sealing portion 66a and the sealing portion 66b. The sealing part 66b seals the cell controller 5 between the sealing part 66a. Since the electrolyte contained in the power generation element 115 stays inside the unit cell 101 by the sealing portion 66a, the electrolyte does not enter the cell controller 5. The bonding strength of the bonding portion 66 is greater than the yield stress of the cell controller 5.

  As described above, this example includes the sealing portion 66a that seals the power generation element 115 and the sealing portion 66b that seals the cell controller 5 between the sealing portion 66a. As a result, if the cell controller 5 is removed from the unit cell 101, the cell controller 5 is damaged, so that the cell controller 5 cannot be used or the information in the cell controller 5 cannot be handled. Unauthorized reuse of the unit cell 101 can be prevented. As a result, the reliability of information of the cell controller 5 can be improved. Moreover, since it can prevent that the cell controller 5 is damaged with electrolyte, the reliability of the information of the cell controller 5 can be improved.

  The sealing portion 66a corresponds to a “first sealing portion”, and the sealing portion 66b corresponds to a “second sealing portion”.

3 ... battery modules 101, 201, 301 ... single cells 111, 112, 211, 212, 311, 312 ... electrode terminals 111a ... notches 113 ... upper exterior member 114 ... lower exterior member 115 ... power generation element 116 ... positive current collector Body 117 ... Negative electrode side current collector 120-124, 221, 223 ... Spacer 131, 132 ... Output terminal 302, 303 ... Insulation cover 302c ... Recess 304, 305 ... Spacer 307 ... Insertion port 360 ... Case 361 ... Upper case 362 ... Lower case 4 ... Lid 41 ... Plate part 41a ... Notch part 42 ... Cylindrical part 421 ... Upper surface part 421b ... Convex part 422 ... Underside part 422b ... Convex part 5 ... Cell controller 51-53 ... Substrate 54 ... Electronic component 51a ... Notch 501 ... Calculation unit 502 ... Sensor 503 ... Switch 504 ... Memory 505 ... Communication Part 6 ... joint 61~66,66a, 66b ... joint 7 ... wiring 71, 72 ... wiring 81 ... vehicle controller 82 ... battery controller 83 ... server

Claims (18)

In a battery module including a unit cell for sealing a power generation element including an electrolyte inside an exterior member,
A battery information management unit including an electronic component for managing information on the unit cell;
A joining portion that joins the battery information management unit and a member constituting the battery module;
The battery module, wherein the joint strength of the joint part is greater than the yield stress of the battery information management part. The member has an insertion port into which the battery information management unit is inserted,
2. The battery module according to claim 1, wherein the joint portion has a structure that allows the battery information management unit to be attached to the insertion port and makes the battery information management unit unremovable from the insertion port. . The battery module according to claim 1, wherein the battery information management unit includes a cut portion. The battery module further includes a lid that covers the battery information management unit on a side surface of the battery module,
The member has an insertion port into which the lid is inserted,
The joint is
A first joint that allows the lid to be attached to the insertion port, and the lid cannot be removed from the insertion port;
The battery module according to claim 1, further comprising a second joint portion that joins the lid and the battery information management portion. The battery module according to claim 4, wherein the lid has a cut portion. A spacer that is disposed between the unit cells when the plurality of unit cells are stacked, and that fixes the unit cells in a predetermined position;
The member has an insertion port into which the lid is inserted,
The joint is
The battery information management unit is attachable to the insertion port, and the battery information management unit is unremovable from the insertion port, a first joint unit;
The battery module according to claim 1, further comprising a second joint portion that joins the spacer and the battery information management portion. The member has a case for accommodating the unit cell,
The battery module according to claim 1, wherein the joining portion joins the inside of the case and the battery information management unit. A spacer that is disposed between the unit cells when the plurality of unit cells are stacked, and fixes the unit cells in a predetermined position;
The joint is
A first joint that joins the inside of the case and the battery information management unit;
The battery module according to claim 7, further comprising a second joint portion that joins the spacer and the battery information management portion. A case for accommodating the unit cell inside;
The battery information management unit has a substrate for holding the electronic component,
The joining portion connects the substrate and the member on the outside of the case,
The battery module according to claim 1, wherein the electronic component is provided between the case and the substrate. The battery module according to claim 9, wherein the member includes a terminal portion that is electrically connected to the unit cell and is led out of the case. A case that houses the unit cell and the battery information management unit inside, and a lid that covers the battery information management unit on a side surface of the case;
The member has an insertion port into which the lid is inserted,
The battery module according to claim 1, wherein the lid is made of a thermosetting resin. The member has an electrode connected to the power generation element,
The battery module according to claim 1, wherein the battery information management unit is provided on a surface of the electrode through the joint. The battery module according to claim 12, wherein the joint strength of the joint is greater than the yield stress of the electrode. A case for accommodating the unit cell inside;
The battery information management unit has a communication unit for communicating the information to the outside,
The battery module according to claim 1, wherein the communication unit is provided outside the case. The battery module according to claim 1, wherein at least a part of the battery information management unit is sealed by the exterior member. The unit cell has an electrode connected to the power generation element,
The battery module according to claim 15, wherein the battery information management unit is provided on a surface of the electrode. The unit cell has a positive electrode and a negative electrode connected to the power generation element,
The battery module according to claim 15 or 16, wherein the battery information management unit is provided between the positive electrode and the negative electrode. The exterior member is
A first seal portion for sealing the power generation element;
The battery module according to claim 15, further comprising a second seal portion that seals the battery information management portion between the first seal portion and the first seal portion.

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