JP6606818B2 - Power storage device module - Google Patents

Description

  The present invention relates to a power storage device module in which a plurality of power storage devices are integrated.

  In recent years, the use of power storage devices has expanded as a power source for vehicles and electronic devices. Hereinafter, an in-vehicle use will be described as an example. A power storage device module for in-vehicle use needs to be mounted in a limited space such as a lower part of a vehicle interior seat. Therefore, downsizing of the electricity storage device module is important. On the other hand, since various impacts and vibrations are applied to the vehicle, the electrical storage device module is required to have a considerable structural strength.

  From the viewpoint of downsizing and increasing strength, it is desirable that a plurality of power storage devices are brought into close contact with each other and integrated. Alternatively, when a gap is generated between a plurality of power storage devices, it is desirable to fill the gap with a sealing resin. However, since the electricity storage device generates heat during charging and discharging, it is also necessary to ensure heat dissipation.

  Therefore, in Patent Document 1, in a battery pack (module) in which a plurality of prismatic batteries are arranged via separators that are plate members, the cooling surface of the battery is exposed, and a heat conduction sheet and a cooling plate are applied to the cooling surface. Proposes contact.

JP 2011-34775 A

  However, as in Patent Document 1, the structure using the heat conductive sheet and the cooling plate is insufficient in heat dissipation, increases the number of parts, and makes it difficult to reduce the size of the module.

  An object of the present invention is to provide a power storage device module having a simple structure excellent in heat dissipation while meeting demands for miniaturization and high strength.

One aspect of the present invention is a group including two or more power storage devices, a joining member that electrically connects the adjacent power storage devices, and an insulating holder that integrates the two or more power storage devices. And a circuit board including a control circuit that controls charging / discharging of the electricity storage device, wherein the holder fits with one end of the group, and the one end of the group A second case that engages with the other end facing the portion, wherein the first case has a first partition member interposed between the adjacent power storage devices, and the second case is adjacent A second partition member interposed between the power storage devices, a space is held between the power storage devices adjacent to each other by the first partition member and the second partition member, and the first case Said one end An inner container for mating, anda outer housing portion disposed on an opposite side of the inner housing portion, said outer housing portion is covered by a cover plate, the circuit board, said outer to said cover plate The present invention relates to an electricity storage device module arranged so as to cover a housing portion.

  According to the present invention, it is possible to provide a power storage device module having a simple structure that is small in size, high in structural strength, and excellent in heat dissipation.

It is a perspective view of an example of the electrical storage device module before completion. It is a perspective view which shows the group of the electrical storage device of the state which removed the 1st case and 2nd case of the holder. It is a perspective view which shows the group of the electrical storage device integrated with the holder, and the exterior case which accommodates this. It is a perspective view which shows the group of the electrical storage device integrated with the holder, and accommodated in the exterior case, and a restraint plate. It is a perspective view which shows the connection relation of a joining member and an electrical storage device. It is the elements on larger scale of FIG. 5 which show the connection relation of a joining member and an electrical storage device. It is a perspective view which shows the relationship between the electrical storage device module accommodated in the exterior case, and a cover plate. It is a perspective view which shows the relationship between the electrical storage device module accommodated in the exterior case, and a circuit board. It is a perspective view which shows the electrical storage device module integrated with the circuit board. FIG. 9B is a cross-sectional view taken along line B-B in FIG. 9A, showing a connection portion between the external terminal of the electricity storage device and the circuit board. It is a perspective view of a 1st case. It is the side view which looked at the 1st case from the X direction. It is the top view which looked at the 1st case from the Z direction. It is the rear view which looked at the 1st case from the opposite of the Z direction. It is the side view which looked at the 1st case from the Y direction. It is a perspective view of a 2nd case. It is the side view which looked at the 2nd case from the X direction. It is the top view which looked at the 2nd case from the Z direction. It is the side view which looked at the 2nd case from the Y direction. It is an enlarged view of the area | region enclosed with the dashed-dotted line of FIG. 11B. It is a perspective view of a connection component. It is a side view of a connection component. It is a top view of a connection component.

[Description of Embodiment of the Invention]
First, the contents of the embodiments of the invention will be listed and described.
The power storage device module according to the present embodiment integrates a group including two or more power storage devices (hereinafter referred to as a device group), a joining member that electrically connects adjacent power storage devices, and two or more power storage devices. And an insulating holder. The holder includes a first case that engages with one end (hereinafter referred to as a first end) of the device group, and a second case that engages with the other end (hereinafter referred to as a second end) facing the first end. And a case. The first case has a first partition member interposed between adjacent power storage devices. The second case has a second partition member interposed between adjacent power storage devices. Two or more power storage devices are connected in series and / or in parallel by a joining member. For example, a metal plate (busbar) is used as the joining member.

  Since the first case and the second case have the first partition member and the second partition member, respectively, the plurality of power storage devices are reliably positioned in the holder and fixed in that state. According to the power storage device module, since a plurality of power storage devices can be integrated with a holder made of two parts, assembly is easy, the structure is simple, and the structural strength is high. Since the structure is simple, it is easy to reduce the size and weight of the module.

  A space is maintained between adjacent power storage devices by the first partition member and the second partition member. Thereby, the space where air convects between the electricity storage devices can be maintained. Therefore, excellent heat dissipation is obtained. Further, there is no problem that the power storage devices come into contact with each other and are rubbed by impact and / or vibration. Therefore, damage to the power storage device can be prevented.

  By connecting the first case and the second case, the first case and the second case may sandwich the device group from the first end and the second end. Thereby, the structural strength of the electricity storage device module is further increased.

In a preferred embodiment, the power storage device includes a power generation element or a power storage element and a square case that houses the power generation element or the power storage element.
That is, the electricity storage device is preferably a square device. The square case generally includes a square metal container and a sealing plate that closes the opening of the metal container. Usually, the sealing plate has two external terminals. It is preferable that the sealing plates of the two or more power storage devices are arranged in alignment with the first end. Further, the shape of the external terminal is not particularly limited, but, for example, a projection shape is preferable. Thereby, it becomes easy to connect the external terminals of the electrical storage device adjacent by a joining member. For example, when the sealing plate has two external terminals having different polarities, a plurality of power storage devices can be connected in parallel by connecting the external terminals having the same polarity. Further, a plurality of power storage devices can be connected in series by connecting external terminals of different polarities of adjacent power storage devices. By arranging the rectangular electricity storage device as described above, the structural strength of the electricity storage device module is further increased.

  The shape of the electricity storage device is not limited to a square shape, and may be a cylindrical shape and / or a laminate shape, or may be other shapes. In addition, power storage devices having different shapes may be integrated into a module.

  Since the holders (the first case and the second case) have insulating properties, the outer surfaces of one end and the other end of the metal container disposed at the first end and the second end are the first case and You may contact the 2nd case directly. Thereby, it becomes unnecessary to cover an electrical storage device with an insulating exterior sheet, and manufacturing cost can be suppressed.

  It is preferable that the first case includes an inner housing portion that engages with the first end portion of the device group, and an outer housing portion that is disposed on the opposite side of the inner housing portion. The outer housing portion accommodates the external terminal and the joining member of the electricity storage device. By housing the external terminal and the joining member in the outer housing portion, the power storage device has a shape that is easy to handle as a whole, and the structural strength is also improved. In addition, it is easy to protect the connection structure between the external terminals and the terminals, and it is easy to ensure insulation between the terminals.

  The sealing plate may have a gas vent valve that operates when the internal pressure of the electricity storage device increases. At this time, it is preferable that the first case has a lid portion facing the gas vent valve with a predetermined interval. Thereby, a sufficient gas passage is secured. Moreover, when the circuit board is arrange | positioned so that an outer side accommodating part may be covered, a circuit board can be protected from gas.

  The outer housing part preferably has a third partition member that electrically insulates the external terminals that are not connected by the joining member among the external terminals of the adjacent power storage devices. Thereby, when joining required external terminals with a joining member, an unnecessary electrical miscontact can be avoided. The third partition member contributes to the improvement of the structural strength.

  The outer housing portion preferably has a rib disposed so as to surround the external terminal and the joining member. Thereby, the electricity storage device has a shape that is easier to handle as a whole, and the structural strength is further improved. At this time, the end surface of the rib and the end surface of the third partition member are preferably flush with each other. This further improves the structural strength. From the same viewpoint, it is preferable that the lid portion facing the gas vent valve is also flush with the end surface of the rib and the end surface of the third partition member.

  The power storage device module may include a circuit board for controlling the power storage device. At this time, the circuit board is preferably arranged so as to cover the outer housing portion. As a result, the distance between the external terminal of the electricity storage device and the circuit board is reduced, and the connection structure between the external terminal and the circuit board can be easily and low resistance.

  Although the kind of electrical storage device which comprises the said electrical storage device module is not specifically limited, A battery and / or a capacitor (or capacitor) are mentioned. Although the kind of battery is not specifically limited, Chemical batteries, such as a nonaqueous electrolyte battery, a lead acid battery, and a nickel metal hydride storage battery, are mentioned. The type of the capacitor (or capacitor) is not particularly limited, and examples thereof include an electric double layer capacitor, a lithium ion capacitor, and a redox capacitor.

[Details of the embodiment of the invention]
Embodiments of the present invention will be specifically described below. In addition, this invention is not limited to the following content, but is shown by the claim, and it is intended that all the changes within the meaning and range equivalent to a claim are included.

  FIG. 1 shows an example of a plurality of prismatic power storage devices integrated by a holder. FIG. 2 shows a state in which the holders (first case and second case) are removed from the plurality of power storage devices.

  The power storage device 100 includes a power generation element or a power storage element, and a square case that houses the element. The square case includes a bottomed square metal container 101 having an upper opening and a sealing plate 103 that closes the upper opening. The opening shape of the metal container 101 is an elongated rectangle or a shape similar to this. The metal container 101 is made of, for example, aluminum or an aluminum alloy.

  A first external terminal 105 penetrating the sealing plate is provided near one side of the sealing plate 103, and a second external terminal 107 penetrating the sealing plate is provided near the other side of the sealing plate. The first external terminal 105 and the second external terminal 107 have opposite polarities, and both have a protrusion shape or a column shape. The first external terminal 105 and the second external terminal 107 are arranged in a symmetrical shape at symmetrical positions of the electricity storage device 100. In the center of the sealing plate 103, a gas vent valve 109 is provided for releasing the gas generated inside when the internal pressure of the electricity storage device 100 rises.

  The sealing plates 103 of the plurality of power storage devices 100 are arranged in alignment with the upper end portion of the device group. The first case 200 has a shape that fits with the upper end portion 100a of the device group, and the second case 300 has a shape that fits with the lower end portion 100b of the device group. Each case has plate-like partition members 201 and 301 interposed between adjacent power storage devices 100. Thereby, in each case, a partition structure that fits into an upper end portion or a lower end portion of each power storage device 100 is formed, and a space 102 is held between adjacent power storage devices 100. Thereby, the outstanding heat dissipation is ensured.

  The arrangement of the electricity storage devices 100 is regulated by a partition structure. Therefore, by inserting each power storage device 100 into the second case 300 from the lower end portion 100b in accordance with the partition structure, the plurality of power storage devices 100 are accommodated in the second case 300 in an aligned state. Thereafter, the device group is fixed by the partition structure of the first case 200 by fitting the first case 200 to the upper end portion 100 a of the device group accommodated in the second case 300. Therefore, the space 102 between the adjacent power storage devices 100 is stably maintained. That is, a plurality of power storage devices can be integrated with a simple operation, and the resulting structure is excellent in stability.

  Since the space is constantly maintained between the adjacent power storage devices 100, the power storage devices 100 are also prevented from contacting each other due to vibration and / or impact. Therefore, electrical insulation between the power storage devices can be reliably ensured, and damage due to friction of the power storage devices can be prevented.

  The first case 200 and the second case 300 are preferably resin parts each having an insulating property and excellent in lightness. The first case 200 and the second case 300 are preferably molded articles of polyolefin and / or a resin composition containing the same, for example. As the polyolefin, polypropylene (PP) having excellent heat resistance is preferable.

  10A to 10E show the external appearance of the first case 200 viewed from each direction. The first case 200 includes a top plate 210 having a lid portion 205 that is in contact with the upper end portion of the electricity storage device 100 and both sides 200a and 200b and facing the gas vent valve 109 in the center, and a top plate 210 excluding the lid portion 205. An outer rib 230 rising upward from the periphery, an inner rib 250 falling downward from the periphery of the top plate 210 excluding the lid portion 205, and a plate-like first partition falling from the top plate so as to equally divide the top plate 210 Member 201 (see FIG. 10D). The top plate 210 is rectangular in plan view, and the lid 205 is flush with the end surface 230 a of the outer rib 230.

  As described above, the first case 200 has the inner housing portion 207 partitioned by the top plate 210 and the inner rib 250, and is partitioned by the top plate 210 and the outer rib 230 on the opposite side of the inner housing portion 207. The outer housing portion 209 is provided.

  The outer rib 230 has a first side wall 231 parallel to the long side of the opening of the metal container 101 and a second side wall 233 parallel to the short side of the opening of the metal container 101 (that is, the stacking direction of the device group). Similarly, the inner rib 250 includes a first side wall 251 parallel to the long side of the opening of the metal container 101 and a second side wall 253 parallel to the short side of the opening of the metal container 101 (that is, the stacking direction of the device group). Have.

  The inner housing portion 207 is further divided into a plurality of sections 203 by the inner rib 250 and the first partition member 201. Each compartment 203 is fitted with one upper end portion of the electricity storage device. As clearly shown in FIG. 10D, the top plate 210 is provided with openings 211 corresponding to the two external terminals of each power storage device for each section. In other words, the inner housing portion 207 and the outer housing portion 209 communicate with each other through a plurality of openings 211 that expose the external terminals to the outer housing portion 209 side.

  As shown in FIGS. 5 and 6, the outer accommodating portion 209 accommodates the protruding external terminals 105 (107) of the electricity storage device 100 and the joining member 400 that connects adjacent terminals. On the other hand, the external terminals not connected by the joining member 400 are isolated from each other by the third partition member 202 provided in the outer housing portion 209. The end surface 230a of the outer rib 230 and the end surface 202a of the third partition member 202 are flush with each other.

  The third partition member 202 is useful for ensuring the safety of the work of connecting some external terminals to each other with a joining member 400 such as a bus bar. If the bus bar and / or tools miscontacts an external terminal that is not a connection target, the power storage device 100 is short-circuited, and the power storage device 100 is damaged or the safety of work is reduced. The third partition member 202 prevents such erroneous contact.

  The outer housing portion 209 may have a concavo-convex shape for fitting with the connection member. Thereby, since arrangement | positioning of a joining member is controlled, the external terminal which should be connected can be selected without making a mistake, and an incorrect connection is prevented.

  11A to 11D show the appearance of the second case 300 viewed from each direction. The second case 300 includes a rectangular bottom plate 310 that contacts the bottom surface of the electricity storage device 100, a rib 330 that rises upward from the periphery of the bottom plate, and a plate-shaped second plate that rises from the bottom plate so as to equally divide the bottom plate. And a partition member 301. The rib 330 is parallel to the long side of the opening of the metal container 101 and is parallel to the first side wall 331 (see FIG. 11B) having a recessed center and the short side of the opening of the metal container 101 (that is, the stacking direction of the device group). A second side wall 333 (see FIG. 11D).

  The second case 300 is divided into a plurality of sections 303 by the ribs 330 and the second partition members 301, and one power storage device is inserted into each section 303. As clearly shown in FIG. 11C, the bottom plate 310 is provided with an opening 311 for each section, and the opening 311 promotes heat dissipation from the bottom surface of the electricity storage device 100.

  The first case 200 includes first engagement members 270 that extend to the second side wall 333 of the second case 300 at a plurality of symmetrical positions on the second side wall 233 (253). On the other hand, the second case 300 includes second engagement members 370 that engage with the first engagement member 270 at a plurality of locations corresponding to the first engagement member 270. By engaging the first engagement member 270 and the second engagement member 370, tension is applied to the first engagement member 270, and the device group is sandwiched between the first case 200 and the second case 300. Thereby, a device group is fixed still more firmly.

  Specifically, as shown in FIG. 10E, the first engagement member 270 is formed as a ring-shaped member extending downward from the second side wall 233 (253). On the other hand, as shown in FIG. 11D and FIG. 11E, the second engagement member 370 is formed as a protrusion whose thickness increases in a tapered shape from the upper end toward the lower portion in the vicinity of the upper end of the second side wall 333. The first case 200 and the second case 300 are connected by engaging the tip of the ring-shaped member with the protrusion.

  As shown in FIG. 3, the electricity storage device 100 integrated with a holder may be accommodated in an outer case 500. When the power storage device module is mounted on a vehicle, it is desirable to use a high-strength outer case 500. FIG. 4 shows a case where the side surface of the electricity storage device accommodated in the outer case 500 is further fixed by the restraining plate 550.

  5 and 6 show a connection relationship between the joining member 400 and the external terminals of the electricity storage device 100. FIG. In the holder, a plurality of power storage devices 100 are accommodated so that the first external terminals 105 and the second external terminals 107 are alternately adjacent to each other. Therefore, when all of the electricity storage devices 100 are electrically connected in series, a plurality of bus bars 401 (if the number of electricity storage devices is n, (n-1) bus bars) are used to be closest to each other. Polar external terminals are alternately connected on the first external terminal side and the second external terminal side. In the illustrated example, the external terminal 105 (107) is a male screw and the bus bar 401 is fixed by the nut 403.

  One first external terminal 105X and the other second external terminal 107Y of the two power storage devices 100 arranged on the outermost side of the device group use an output terminal or an input terminal of the power storage device module and a special connection component 405. Connected. On the other hand, external terminals that are not connected by the bus bar 401 are isolated from each other by the third partition member 202 of the outer housing portion 209.

  FIG. 7 shows the relationship between the power storage device module housed in the exterior case 500 and the cover plate 570. The outer housing portion 209 is covered with a cover plate 570, and the external terminals and the connection structure are isolated from the outside. Thereby, the insulation between external terminals is ensured more reliably.

  FIG. 8 shows the same configuration as the power storage device module of FIG. 7 except that the form of the outer case is different. As shown in FIG. 8, a circuit board 600 including a control circuit that controls charging / discharging of the electricity storage device 100 can be disposed on the cover plate 570 of the electricity storage device module housed in the outer case 500. FIG. 9A shows an appearance of an example of the electricity storage device module 700 integrated with the circuit board 600. FIG. 9B shows a connection structure between the external terminal 107 </ b> Y of the electricity storage device 100 and the circuit board 600. 9B is a BB line arrow view of FIG. 9A.

  The external terminal of the electricity storage device 100 and the circuit board 600 are connected via a connection component 405 as shown in FIGS. 12A to 12C. The connecting component 405 has a hole 405a through which the external terminal 105 (107) passes, a plate-like portion 405b to be crimped with the nut 403, and a columnar portion 405c extending upward from the plate-like portion 405b with a gap from the hole 405a. And have. A hollow portion 405d may be provided near the tip of the columnar portion 405c, and a screw groove may be formed on the inner wall of the hollow portion 405d so that the columnar portion 405c is a female screw.

The columnar portion 405 c of the connection component 405 has a height that reaches the circuit board 600 through the through hole 571 provided in the cover plate 570. A guide component 575 that insulates the cover plate 570 and the columnar portion 405 c may be interposed in the through hole 571. The tip of the columnar portion 405c is, for example, a flat surface. The flat surface at the tip of the columnar portion 405 c can be brought into contact with the terminal electrode 601 exposed on the lower surface of the circuit board 600. In this state, by engaging the male screw 590 with the female screw of the columnar part 405c, the flat surface at the tip of the columnar part 405c and the terminal electrode 601 of the circuit board 600 are firmly in surface contact, and electrical connection is achieved. The The contact area between the tip of the columnar portion 405c and the terminal electrode 601 is desirably 20 mm ² or more. As a result, the resistance at the input / output terminal portion is lowered, which is advantageous for charging and discharging with a large current.

  The power storage device module of the present invention has high resistance to vibration and / or impact, and can maintain excellent heat dissipation over a long period of time, and thus is suitable for mounting in a vehicle, for example.

  100: electricity storage device, 100a: upper end portion, 100b: lower end portion, 101: metal container, 102: space, 103: sealing plate, 105 (105X): first external terminal, 107 (107Y): second external terminal, 109 : Gas vent valve, 200: First case, 200a, 200b: Side, 201: First partition member, 202: Third partition member, 202a: End surface of the third partition member, 203: Partition, 205: Lid, 207 : Inner housing portion, 209: outer housing portion, 210: top plate, 211: opening of top plate, 230: outer rib, 230a: end surface of outer rib, 231: first side wall of outer rib, 233: first side of outer rib 2 side walls, 250: inner rib, 251: first side wall of inner rib, 253: second side wall of inner rib, 270: first engaging member, 300: second case, 301: second partition member, 303: section 310: bottom plate, 311: opening of bottom plate, 330: rib, 331: first side wall of rib, 333: second side wall of rib, 370: second engaging member, 400: joining member, 401: bus bar, 403 : Nut, 405: connecting part, 405a: hole, 405b: plate-like part, 405c: columnar part, 405d: hollow part, 500: exterior case, 550: restraining plate, 570: cover plate, 571: through hole, 575: Guide parts, 590: male screw, 600: circuit board, 601: terminal electrode, 700: power storage device module

Claims (14)

A group comprising two or more power storage devices;
A joining member for electrically connecting the power storage devices adjacent to each other;
An insulating holder that integrates the two or more power storage devices;
A circuit board comprising a control circuit for controlling charging and discharging of the electricity storage device,
The holder is
A first case mating with one end of the group;
A second case mating with the other end facing the one end of the group;
The first case has a first partition member interposed between adjacent power storage devices,
The second case has a second partition member interposed between the adjacent power storage devices,
A space is held between the adjacent power storage devices by the first partition member and the second partition member,
The first case includes an inner housing portion that engages with the one end portion of the group, and an outer housing portion disposed on the opposite side of the inner housing portion,
The outer housing portion is covered by a cover plate;
The power storage device module, wherein the circuit board is disposed on the cover plate so as to cover the outer housing portion.   The power storage device according to claim 1, wherein the first case and the second case sandwich the group from the one end and the other end by connecting the first case and the second case. module. The power storage device includes a power generation element or a power storage element, and a square case that houses the power generation element or the power storage element,
The square case comprises a metal container and a sealing plate that closes the opening of the metal container,
The sealing plate has an external terminal;
The sealing plates of the two or more power storage devices are arranged in alignment on the one end;
The power storage device module according to claim 1, wherein the joining member connects the external terminals of the adjacent power storage devices.   The outer surface of one and the other ends of the metal containers arranged at the one and other ends of the group, and the first case and the second case are in direct contact with each other. The electricity storage device module described.   The power storage device module according to claim 3 or 4, wherein the outer housing portion houses the external terminal and the joining member. The sealing plate has a gas vent valve that operates when an internal pressure of the power storage device increases,
The power storage device module according to any one of claims 3 to 5, wherein the first case has a lid portion that faces the gas vent valve with a predetermined interval.   The power storage device module according to claim 5, wherein the outer housing portion includes a third partition member that electrically insulates the external terminals that are not connected by the bonding member of the adjacent power storage device. The outer housing portion has a rib disposed so as to surround the external terminal and the joining member,
The power storage device module according to claim 7, wherein an end surface of the rib and an end surface of the third partition member are flush with each other.   The power storage device module according to any one of claims 1 to 8, wherein the power storage device is a battery and / or a capacitor. Furthermore, comprising a connection component for connecting the external terminal and the circuit board,
The connection component includes a plate-like portion connected to the external terminal, and a columnar portion extending upward from the plate-like portion,
The circuit board has terminal electrodes;
The electrical storage device module of any one of Claims 3-8 with which the front-end | tip of the said columnar part is connected with the said terminal electrode.   The power storage device module according to claim 10, wherein the plate-like portion has a hole through which the external terminal passes and is crimped with a nut.   The power storage device module according to claim 10 or 11, wherein a tip of the columnar portion has a flat surface, and the flat surface is in surface contact with the terminal electrode. The columnar part has a hollow part near the tip,
The inner wall of the hollow portion has a female screw;
The power storage device module according to claim 12, wherein the columnar portion and the terminal electrode are joined by fitting a male screw into the hollow portion. The electrical storage device module of Claim 12 or Claim 13 whose contact area of the said flat surface of the said columnar part and the said terminal electrode is 20 mm < ² > or more.

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