JP2021150411A - Power storage module - Google Patents

Abstract

To provide a power storage module which is excellent in prevention of leakage of an electrolytic solution, water resistance and moisture resistance, and earthquake resistance while being lightweight and small.SOLUTION: A power storage module 1 includes: a power storage cell 2 which has a power storage element that can be charged and discharged, an electrolytic solution, a positive electrode terminal 32 and a negative electrode terminal 33 connected to the power storage element, and an outer package 23 for storing the power storage element and the electrolytic solution and storing a positive electrode terminal 21 and a negative electrode terminal 22 so that one end of the positive electrode terminal and one end of the negative electrode terminal project; and a resin potting part 3 formed so as to cover at least one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22, and a projection position of the one end of the positive electrode terminal 21 and a projection position of the negative electrode terminal 22 in the outer package 23.SELECTED DRAWING: Figure 2

Description

The present invention relates to a power storage module.

A power storage module including a power storage cell such as a lithium ion capacitor as shown in Patent Document 1 is widely known. In recent years, such power storage modules have been installed as power supply devices in various products such as vehicles such as automobiles, drones, agricultural equipment, and robots. The storage cell of the power storage module has a configuration for releasing the electrolytic solution in the exterior body from the exterior body when the internal pressure rises in order to prevent the internal pressure from rising extremely when an abnormality occurs. For example, if the exterior body is a laminated film sealed by heat fusion, a part of the heat fusion part is sealed at a temperature lower than that of the other part, or a safety valve is provided. The power storage module described in Patent Document 1 is provided with an electrolytic solution absorbing member in the housing so that the leaked electrolytic solution does not leak to the outside.

Japanese Unexamined Patent Publication No. 2019-71377

However, when a configuration such as the power storage module described in Patent Document 1 described above is provided so that the electrolytic solution does not leak from the inside of the housing, the configuration tends to be complicated and it is necessary to improve the sealing property of the housing. Therefore, the power storage module is large and easy to be heavy. As described above, since the power storage module has been installed in various products in recent years, the market demands that the power storage module be small and lightweight. In addition, depending on the product, it is expected that it will be used outdoors or in a situation with a lot of vibration. It is requested.

Therefore, an object of the present invention is to provide a power storage module which is lightweight and compact, yet has excellent prevention of leakage of electrolytic solution, water resistance / moisture resistance, rust prevention and earthquake resistance.

(1) In order to solve the above problems, the power storage module according to the present invention includes a power storage element capable of charging and discharging, an electrolytic solution, positive electrode terminals and negative electrode terminals connected to the power storage element, the power storage element and the above. A storage cell including a positive electrode terminal and an exterior body for accommodating the negative electrode terminal so that one end of the positive electrode terminal and one end of the negative electrode terminal project while accommodating the electrolytic solution, one end of the positive electrode terminal, and the said. It is characterized by including a resin potting portion formed so as to cover at least one end of the negative electrode terminal and the protruding position of one end of the positive electrode terminal and the protruding position of one end of the negative electrode terminal in the exterior body.

According to the configuration described in (1) above, one end of the positive electrode terminal and one end of the negative electrode terminal are covered with a resin potting portion. Therefore, it is possible to prevent a short circuit or the like due to contact of another member, a foreign substance, or the like with the positive electrode terminal or the negative electrode terminal. Further, the electrolytic solution easily leaks from the protruding positions of one end of the positive electrode terminal and one end of the negative electrode terminal in the exterior body, but since these parts are covered with the resin potting portion, the electrolytic solution is prevented from leaking from the storage cell. can. Furthermore, by covering the protruding positions of one end of the positive electrode terminal and one end of the negative electrode terminal in the exterior body with a resin potting portion, where water and moisture easily enter, the power storage module is excellent in waterproofness, moisture resistance, and rust prevention. Can be considered. Further, since a part of the power storage cell is covered with the resin potting portion, the power storage module can be made excellent in earthquake resistance. In this way, the positive electrode terminal and the negative electrode terminal are hard to short-circuit, and are excellent in waterproof / moisture-proof, rust-proof and earthquake-resistant, so that the storage cell is less likely to cause an abnormality and the internal pressure of the exterior body rises extremely. Can be effectively prevented. Therefore, even if the electrolytic solution is prevented from leaking from the exterior body by covering with the resin potting portion, the storage cell is unlikely to burst. Further, since such an effect can be realized by a simple configuration in which the storage cell is covered with the resin potting portion, the number of parts of the power storage module can be reduced, and the size and weight can be reduced. As a result, it is possible to make it excellent in prevention of leakage of electrolytic solution, water resistance, moisture resistance, rust prevention, and earthquake resistance while being lightweight and compact.

(2) In the power storage module, in the exterior body, one end of the positive electrode terminal protrudes from one side and one end of the negative electrode terminal protrudes from the other side, or one end of the positive electrode terminal protrudes from one side. The positive electrode terminal and the negative electrode terminal are housed so that one end of the negative electrode terminal protrudes from a position different from the protruding position of one end of the positive electrode terminal on the one side, and a plurality of the storage cells are laminated. The plurality of storage cells are formed by welding one end of the positive electrode terminal of at least one storage cell in the laminated body with one end of the negative electrode terminal of the other storage cell. The resin potting portions, which are connected in series, may be formed so as to cover one end of the welded positive electrode terminal and one end of the negative electrode terminal.

According to the configuration of (2) above, the positive electrode terminal and the negative electrode terminal may be inclined diagonally due to welding of one end of the positive electrode terminal of one storage cell and one end of the negative electrode terminal of another storage cell. In this case, if the positive electrode terminal and the negative electrode terminal are not fixed, they move due to vibration or the like, and the roots of the positive electrode terminal and the negative electrode terminal are easily damaged. According to the above configuration, the resin potting material covers one side and the other side portion of the exterior body, one end of the welded positive electrode terminal and one end of the negative electrode terminal, so that the positive electrode terminal and the negative electrode terminal are vibrated or the like. By fixing it so that it does not move, it is possible to prevent the roots of the positive electrode terminal and the negative electrode terminal from being damaged. Further, in order to prevent fundamental damage between the positive electrode terminal and the negative electrode terminal, the positive electrode terminal and the negative electrode terminal are connected by electrically connecting one end of the positive electrode terminal and one end of the negative electrode terminal via a metal member. However, in the above configuration, one end of the positive electrode terminal and one end of the negative electrode terminal of the power storage cell may be directly welded without using a metal member, so that the power storage cell is not tilted. The module can be miniaturized (thinned).

(3) The power storage module of the above (2) further includes a case, and one end of the positive electrode terminal and one end of the negative electrode terminal, and the protruding position of one end of the positive electrode terminal and the protruding position of one end of the negative electrode terminal in the exterior body. The resin molded body covered with the resin potting portion by resin molding may be housed in the case.

According to the configuration of (3) above, one end of the positive electrode terminal and one end of the negative electrode terminal, and the protruding position of one end of the positive electrode terminal and the protruding position of one end of the negative electrode terminal in the exterior body are resin-molded to form a resin potting portion. Since the resin mold body covered with is stored in the case, it is easy to attach / detach the resin mold body from the case, and it is easy to perform maintenance.

(4) The power storage module of the above (2) further includes a case, and the laminated body is arranged on the bottom of the case and fixed to the side opposite to the bottom of the case so as to be adjacent to the laminated body. A plate may be arranged and the fixing plate may be fixed to the case.

According to the configuration of (4) above, by fixing the fixing plate to the case, the laminate can be sandwiched between the bottom of the case and the fixing plate and fixed so as not to come out of the case. With such a simple configuration, a plurality of storage cells can be fixed in the case.

(5) In the power storage module of the above (4), the resin potting portion may cover the laminated body and the fixing plate.

According to the configuration of (5) above, since the resin potting portion covers the entire laminate and the fixing plate, the sealing property of the resin potting portion is further improved. As a result, the leakage of the electrolytic solution from the storage cell, the waterproof property and the moisture proof property can be further improved. Further, the entire laminate and the fixing plate can be fixed to each other by the resin potting portion, and the laminate can be firmly fixed so as not to come out of the case.

(6) The power storage module according to (5) is further provided with a protection circuit board that is electrically connected to the laminate housed in the case to prevent overcharging and overdischarging of the plurality of power storage cells. , The protection circuit board may be arranged above the resin potting portion.

According to the configuration (6) above, when the case is filled with the resin potting material to form the resin potting portion, the protective circuit board does not interfere with the resin potting portion, and the resin potting portion can be formed satisfactorily. .. Further, the protection circuit board may also be covered with a resin potting portion.

(7) In the power storage module of the above (6), the lid portion of the case is arranged above the protection circuit board so as to be adjacent to the protection circuit board, and even if the lid portion is fixed to the case. good.

According to the configuration of (7) above, the protection circuit board can be fixed by sandwiching the protection circuit board between the lid part and the resin potting part only by fixing the lid part to the case, and the number of parts is small and the protection circuit board is fixed. Can be done. This makes it possible to provide an inexpensive, compact and lightweight power storage module. Further, since the protection circuit board is arranged above the inside of the case and the protection circuit board is exposed by opening the lid portion, maintenance of the protection circuit board can be easily performed.

(8) The exterior body may be made of a laminated film.

When the exterior body is made of a laminated film, the protruding sides (one side of the exterior body and the other side of the exterior body) of one end of the positive electrode terminal and one end of the negative electrode terminal in the exterior body are intentionally. It is often formed so that the electrolytic solution leaks more easily than other parts. According to the configuration of (8) above, since the portion where the electrolytic solution easily leaks is covered with the resin potting material, the leakage of the electrolytic solution from the storage cell can be effectively prevented.

(9) The storage cell may be any of a lithium ion capacitor, an electric double layer capacitor, and a lithium ion battery.

Lithium-ion capacitors, electric double-layer capacitors, and lithium-ion batteries are often mounted on vehicles (cars and drones), and while being lightweight and compact, they can be used in harsh environments such as outdoors and have a long life. The market is demanding the provision of power storage modules. With the above configuration, a power storage module using a lithium ion capacitor, an electric double layer capacitor, and a lithium ion battery as a power storage cell can be used in a harsh environment such as outdoors and has a long life while being lightweight and compact. ..

According to the above configuration, it is possible to provide a power storage module which is lightweight and compact, yet has excellent prevention of leakage of electrolytic solution, water resistance / moisture resistance, rust resistance, and earthquake resistance.

It is a perspective view of the power storage module which concerns on 1st Embodiment. It is a perspective view of the power storage module shown in FIG. 1 which showed the internal structure. It is a top view of the power storage module shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of the power storage module shown in FIG. It is an exploded view of the power storage module shown in FIG. It is a perspective view of the resin mold which concerns on the modification of 1st Embodiment. It is a perspective view of the power storage module which concerns on 2nd Embodiment. It is a perspective view of the power storage module shown in FIG. 7 which showed the internal structure. It is a perspective view of the resin mold shown in FIG. 7. It is a front side view of the resin mold shown in FIG. FIG. 10 is a cross-sectional view taken along the line BB of the resin mold shown in FIG. It is a schematic diagram which shows the manufacturing method of the power storage module which concerns on 2nd Embodiment. It is an exploded view of the power storage module which concerns on 3rd Embodiment. It is sectional drawing of the power storage module which concerns on 3rd Embodiment. FIG. 6 is a cross-sectional view of the power storage module according to the third embodiment, in which the cross section at the position CC shown in FIG. 14 is visually recognized from the direction of the arrow.

(First Embodiment)
The power storage module according to the first embodiment will be described in detail below with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of a hook-and-loop fastener according to the first embodiment. FIG. 1 is a perspective view of the power storage module according to the first embodiment. FIG. 2 is a perspective view of the power storage module shown in FIG. 1 showing the internal structure. FIG. 3 is a plan view of the power storage module shown in FIG. FIG. 4 is a cross-sectional view taken along the line AA of the power storage module shown in FIG. In FIG. 4, the wiring 5 described later should be shown by a broken line, but is shown by a solid line in consideration of easy visibility of the drawing. FIG. 5 is an exploded view of the power storage module shown in FIG. The left side of FIG. 3 is the left side of the power storage module 1, the right side of FIG. 3 is the right side of the power storage module 1, the upper side of FIG. 3 is the rear side of the power storage module 1, the lower side of FIG. 3 is the front side of the power storage module, and FIG. The front side is the upper side of the power storage module 1, and the back side of FIG. 3 is the lower side of the power storage module 1.

The power storage module 1 according to the first embodiment can be used as a power supply device for various devices such as vehicles such as hybrid vehicles and electric vehicles, drones, agricultural equipment, and robots.

[Structure of power storage module according to the first embodiment]
Hereinafter, the configuration of the power storage module 1 according to the first embodiment will be described with reference to FIGS. 1 to 5. The power storage module 1 includes a power storage cell 2 that can be charged and discharged, a potting unit 3 that covers the entire power storage cell 2, and a housing 4 that houses the power storage cell 2 and the resin potting unit 3. The power storage cell 2 has a substantially square shape in a plan view, and has a power storage element (not shown) that can be charged and discharged, an electrolytic solution (not shown), and a positive electrode terminal 21 and a negative electrode connected to the power storage element (not shown). An exterior body that houses the terminals 22, a power storage element (not shown), and an electrolytic solution (not shown), and also stores the positive electrode terminals 21 and 22 negative electrode terminals so that one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22 protrude. 23 and. In the first embodiment, the power storage cell 2 has a substantially square shape in a plan view, but other shapes can be adopted. In the first embodiment, the exterior body is such that one end of the positive electrode terminal 21 protrudes from one of the right side and the left side of the exterior body 23, and one end of the negative electrode terminal 22 protrudes from the other side. The positive electrode terminals 21 and 22 negative electrode terminals are housed in 23.

In the first embodiment, a plurality of (for example, four) power storage cells 2 are laminated to form the laminated body 20. First, the configuration of the power storage cell 2 constituting the laminated body 20 will be described. In the power storage module 1 according to the first embodiment, the power storage cell 2 is a lithium ion capacitor. However, the storage cell 2 may be another chargeable / dischargeable cell such as an electric double layer capacitor or a lithium ion battery. As described above, the power storage cell 2 includes a power storage element (not shown) capable of charging and discharging and an electrolytic solution (not shown). The power storage element (not shown) is configured by laminating a substantially square positive electrode (not shown) and a negative electrode (not shown) in a plan view via a separator (not shown), and has, for example, a substantially rectangular parallelepiped shape. The positive electrode (not shown) is a sheet-like member in which a positive electrode material (for example, a mixture of a positive electrode active material such as activated carbon and a binder resin) is laminated on a current collecting foil such as a porous aluminum foil. The negative electrode (not shown) is in the form of a sheet in which a negative electrode material (for example, a mixture of a negative electrode active material such as graphite and a binder resin) is laminated on a current collecting foil such as a porous copper foil. The separator is an insulator, and is a sheet-like member made of a woven fabric, a non-woven fabric, a synthetic resin microporous film, or the like.

The positive electrode (not shown) constituting the power storage element (not shown) is electrically connected to the positive electrode terminal 21 by attaching the base of the positive electrode terminal 21 which is a metal foil or a metal plate made of, for example, aluminum or the like. .. Further, the negative electrode (not shown) is electrically connected to the negative electrode terminal by attaching the root of the negative electrode terminal 22 which is a metal foil or a metal plate made of copper or the like. Both the mounting position of the root of the positive electrode terminal 21 and the mounting position of the root of the negative electrode terminal 22 are the side surfaces of the electricity storage element (not shown) having a substantially rectangular parallelepiped shape, but they are mounted on the side surfaces facing each other. As a result, the positive electrode terminal 21 and the negative electrode terminal 22 are attached so as to project in opposite directions. The power storage element (not shown) is not limited to having a substantially rectangular parallelepiped shape, and the mounting positions of the positive electrode terminal 21 and the negative electrode terminal 22 are not limited to the side surfaces facing each other. The positive electrode terminal 21 and the negative electrode terminal 22 may be attached to the power storage element (not shown) so as to project in different directions.

In the first embodiment, the exterior body 23 is a laminated film in which both the front and back surfaces of the metal foil are coated with a synthetic resin, and the synthetic resin is heat-sealed at the peripheral edge of the power storage element (not shown). An electrolytic solution (not shown) is sealed inside the heat-sealed portion. As a result, in the cell 2, the thickness of the portion where the power storage element (not shown) is arranged becomes thicker than the thickness of the heat-sealed portion, and the cell 2 is horizontal from the peripheral edge of the portion where the power storage element (not shown) is arranged. It has a shape like a brim. The exterior body 23 does not necessarily have to be a laminated film, and any material that can seal the power storage element (not shown) can be used. The tip of the positive electrode terminal 21 and the tip of the negative electrode terminal 22 are drawn out from the exterior body 23.

Next, the configuration of the laminated body 20 will be described. When distinguishing the positive electrode terminal 21 and the negative electrode terminal 22 of each storage cell 2 from each storage cell 2 in the laminated body 20, the storage cell 2 arranged at the bottom and the positive electrode terminal 21 and the negative electrode terminal 22 thereof are referred to as " With the subscript "A", it is described as a power storage cell 2A, a positive electrode terminal 21A, and a negative electrode terminal 22A. The storage cell 2, the positive electrode terminal 21 and the negative electrode terminal 22 arranged second from the bottom are referred to as the storage cell 2B, the positive electrode terminal 21B and the negative electrode terminal 22B by adding the subscript "B". The storage cell 2, the positive electrode terminal 21 and the negative electrode terminal 22 arranged third from the bottom are referred to as the storage cell 2C, the positive electrode terminal 21C and the negative electrode terminal 22C by adding a subscript "C". The storage cell 2 and its positive electrode terminal 21 and negative electrode terminal 22 arranged at the fourth (top) position from the bottom are described as the power storage cell 2D, the positive electrode terminal 21D, and the negative electrode terminal 22D by adding the subscript "D". do.

In the laminated body 20, the power storage cells 2A and the power storage cells 2C are arranged so that the positive electrode terminals 21A and 21C project to the left and the negative electrode terminals 22A and 22C project to the right. Further, the storage cell 2B and the storage cell 2D are arranged so that the positive electrode terminals 21A and 21C project to the right and the negative electrode terminals 22A and 22C project to the left.

One end (tip) of the positive electrode terminal 21B of the power storage cell 2B in the laminated body 20 and one end (tip) of the negative electrode terminal 22A of the power storage cell 2A are welded. Further, one end (tip) of the positive electrode terminal 21C of the power storage cell 2C and one end (tip) of the negative electrode terminal 22B of the power storage cell 2B are welded. Further, one end (tip) of the positive electrode terminal 21D of the power storage cell 2D and one end (tip) of the negative electrode terminal 22C of the power storage cell 2C are welded. As a result, the plurality of storage cells 2 constituting the laminated body 20 are connected in series. In this way, the tip of the positive electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the tip of the negative electrode terminal 22C are directly welded without using a member. Therefore, the laminated body 20 can be made lightweight and thin. By such direct welding, the positive electrode terminal 21B, the negative electrode terminal 22A, the positive electrode terminal 21C, the negative electrode terminal 22B, the positive electrode terminal 21D, and the negative electrode terminal 22C are not horizontal but are inclined from the root.

In the first embodiment, the tip of the positive electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the tip of the negative electrode terminal 22C are directly welded to each other. However, a plurality of storage cells 2 are connected in series by welding one end of the positive electrode terminal 21 of at least one storage cell 2 in the laminated body 20 and one end of the negative electrode terminal 22 of the other storage cell 2. Just do it. That is, any one of the tip of the electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the tip of the negative electrode terminal 22C is directly welded. Just do it.

The other end of the two wirings 5 having one end attached to the wiring connector 6 is electrically attached to the laminate 20. Of the two wirings 5, one end of the wiring 51 is attached to one connection terminal of the wiring connector 6 having two connection terminals, and the other end of the wiring 51 is electrically connected to the positive electrode terminal 21A of the storage cell 2A. Has been done. One end of the other wiring 52 of the two wirings 5 is attached to the other connection terminal of the wiring connector 6, and the other end of the wiring 52 is electrically connected to the negative electrode terminal 22D of the storage cell 2D. .. In this way, the laminate 20 is electrically connected to various devices such as vehicles, drones, agricultural equipment, and robots by the wiring connector 6 and the wiring 5, and the power storage module 1 serves as a power supply device for these devices.

The resin potting portion 3 is made of solidified resin potting materials such as urethane resin, epoxy resin, and silicon resin, and has a substantially rectangular shape, and the entire laminate 20 and the wiring connector 6 in the wiring 5 are not attached to the inside. Cover one end. The resin potting portion 3 is not limited to having a substantially rectangular parallelepiped shape, and any shape can be adopted as long as it can cover the laminated body 20 and the wiring 5. In this way, the resin potting portion 3 causes one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22, the protruding position of one end of the positive electrode terminal 21 in the exterior body 23, and the protruding position of one end of the negative electrode terminal 22 (in the exterior body 23). It can cover the right side and the left side (“one side and the other side” of the present invention). Since one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22, that is, the portion exposed from the exterior body 23 is covered with the resin potting portion 3, other members, foreign substances, etc. may be present on the positive electrode terminal 21 and the negative electrode terminal 22. By making contact, it is possible to prevent a short circuit or the like. Further, the exterior body 23, which is a laminated film sealed by heat fusion, intentionally has other portions on the protruding sides (right side and left side of the exterior body 23) of one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22. It may be formed so that the seal can be easily removed from the part of. In such a case, the electrolytic solution (not shown) easily leaks from this portion, but since this portion is covered with the resin potting portion 3, it is necessary to prevent the electrolytic solution C from leaking from the storage cell 2. Can be done. In addition, it is possible to prevent water and moisture from entering the inside from this portion, and the power storage module 1 can be made excellent in waterproofness and moisture resistance. Further, the resin potting portion 3 improves the earthquake resistance of the power storage module 1.

Here, if even a part of the power storage cell 2 is covered with the resin potting portion 3, the power storage module 1 can be made excellent in earthquake resistance, but in the first embodiment, the entire laminated body 20 is covered. Since it is covered with the resin potting portion 3, the effect of preventing leakage of the electrolytic solution (not shown), the effect of earthquake resistance, the effect of waterproof / moisture proof, and the effect of rust prevention can be further enhanced.

Further, as described above, the tip of the electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the tip of the negative electrode terminal 22C are welded. The positive electrode terminal 21B, the negative electrode terminal 22A, the positive electrode terminal 21C, the negative electrode terminal 22B, the positive electrode terminal 21D, and the negative electrode terminal 22C are not horizontal, but are inclined from the root (attachment position with the power storage element in the figure). If the inclined positive electrode terminal 21 and the negative electrode terminal 22 are not fixed, they move (wobble) due to vibration or the like, and the roots of the positive electrode terminal 21 and the negative electrode terminal 22 are easily damaged. However, in the power storage module 1 according to the first embodiment, the resin potting material 3 covers the positive electrode terminal 21 and the negative electrode terminal 22 and the attachment side portions of the positive electrode terminal 21 and the negative electrode terminal 22 in the exterior body 23. Therefore, the positive electrode terminal 21 and the negative electrode terminal 22 can be fixed so as not to move due to vibration or the like, and it is possible to prevent the roots of the positive electrode terminal 21 and the negative electrode terminal 22 from being damaged. In order to prevent fundamental damage between the positive electrode terminal 21 and the negative electrode terminal 22, the positive electrode terminal is connected to the positive electrode terminal by electrically connecting one end of the positive electrode terminal 21 and one end of the negative electrode terminal via a metal member. Conventionally, the negative electrode terminal 22 is not tilted diagonally, but in the configuration of the first embodiment, one end of the positive electrode terminal 21 of the storage cell 2 and the negative electrode terminal 22 are directly formed without using a metal member. Since one end of the power storage module 1 can be welded, the power storage module 1 can be made smaller (thinner) and lighter.

The resin potting portion 3 is formed by a resin mold (injection molding). Specifically, in a state where the laminated body 20 with the wiring 5 attached is put in a mold (not shown), the mold (not shown) is filled with a resin potting material, and a predetermined time elapses to form a resin. The potting material is cured to form the resin potting portion 3. The laminated body 20 with the wiring 5 attached covered with the resin potting portion 3 is referred to as a resin molded body 30. As described above, in the power storage module 1 according to the first embodiment, one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22, the protruding position of one end of the positive electrode terminal 21 and the protruding position of one end of the negative electrode terminal 22 in the exterior body 23. The resin mold body 30 which is resin-molded and covered with the resin potting portion 3 is put into the housing 4. In this way, since the laminated body 20 is housed in the housing 4 (case 41) in the state of the resin mold body 30 in which the laminated body 20 is resin-molded and covered with the resin potting portion 3, the resin mold body 30 is attached and detached from the housing 4. It is easy to do, and it is easy to perform maintenance.

The housing 4 has a substantially rectangular parallelepiped shape, and has a case 41 having a bottom portion 411 and a side surface 412, and a lid portion 42 for closing the opening of the case 41. In the first embodiment, the housing 4 is made of metal, but may be made of resin. The case 41 has a substantially quadrangular bottom portion 411 having a thickness arranged below, and a side surface 412 standing upright so as to extend upward from the four sides thereof. In addition, the case 41 has a bent portion 4121 extending horizontally inward from the upper edge of the front and rear side surfaces 412. The case 41 has the same width and depth dimensions, and the height dimension is shorter than the width and depth dimensions. However, the case 41 may adopt another shape. The dimensions of the case 41 in the left-right direction and the front-rear direction are formed to be slightly larger than the dimensions of the resin mold body 30 so that the resin mold body 30 can be stored. From the viewpoint of the earthquake resistance of the power storage module 1, it is preferable that the storage module 1 is not moved to. A notch 4122 is formed at the rear upper corner of the left side surface 412, and the end of the wiring 5 to which the wiring connector 6 is attached is pulled out from the notch 4122.

The lid portion 42 is a substantially quadrangular member having a thickness formed to substantially match the bottom portion 411, but any shape can be adopted as long as the opening of the case 41 can be closed. The lid portion 42 is formed with two screw holes 421 at the front end and the rear end, respectively. The lid portion 42 is fixed to the attachment hole 4121A of the bent portion 4121 in the case 41 by the screw 43 through the hole 421. As a result, the lid portion 42 can be attached to the opening of the case 41.

[Manufacturing method of power storage module according to the first embodiment]
The manufacturing method of the power storage module 1 according to the first embodiment is described below. First, after stacking a plurality (4) storage cells 2, the tip of the positive electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the negative electrode terminal The laminated body 20 is manufactured by welding the tip of 22C. After that, one end of the wiring 51 is welded to the positive electrode terminal 21A of the storage cell 2A, and one end of the wiring 52 is welded to the negative electrode terminal 22D of the storage cell 2D. After that, the wiring connector 6 is connected to the other ends of the wirings 51 and 52, and then the laminated body 20 is placed in the mold. The mold is prepared with dimensions that match the case 41. In order to arrange the laminated body 20 in the central portion of the resin molded body 30, a small amount of resin potting material is filled in the mold in advance and hardened by allowing a predetermined time to elapse, and then the laminated body 20 is put on the mold. A resin potting material may be further added to the container. After that, the resin molded body 30 is formed by allowing a predetermined time to elapse. Then, the case 41 (the case 41 in which the cutout portion 4122 is formed) and the lid portion 42 are manufactured by mold molding or the like. Then, the resin mold body 30 is put into the case 41. Here, the resin mold body 30 is put in the case 41 so that the wirings 51 and 52 are located on the left side, and the end portion to which the wiring connector 6 of the wirings 51 and 52 is attached is inserted into the cutout portion 4122 of the case 41. Will be inserted. As a result, the end portion of the wiring 51, 52 to which the wiring connector 6 is attached is pulled out to the outside of the case 41. Then, the lid portion 42 is placed so as to close the opening at the upper part of the case 41, and the screw 43 is screwed into the mounting hole 4121A of the bending portion 4121 from above the lid portion 42 via the screw fixing hole 421. As a result, the lid portion 42 is fixed to the case 41, and the power storage module 1 in which the resin molded body 30 is housed in the housing 4 is manufactured.

According to the configuration of the power storage module 1 according to the first embodiment described above, since the resin potting portion 3 covers the laminated body 20, other members or foreign matter come into contact with the positive electrode terminal 21 and the negative electrode terminal 22 of the power storage cell 2. It is possible to provide a power storage module 1 which is less likely to cause a short circuit or leakage of an electrolytic solution (not shown), and is excellent in waterproof / moisture proof, earthquake resistance, and rust proof. As described above, since the positive electrode terminal 21 and the negative electrode terminal 22 are hard to short-circuit and are excellent in waterproofness, moisture resistance, and earthquake resistance, the power storage cell 2 is unlikely to cause an abnormality, and the internal pressure of the exterior body 23 rises extremely. This can be effectively prevented. Therefore, even if the electrolytic solution is prevented from leaking from the exterior body 23 by covering with the resin potting portion 3, the storage cell 2 is unlikely to burst. As a result, the power storage module 1 can be used in a harsh environment such as outdoors and has a long life. Further, since such an effect can be realized by a simple configuration in which the resin potting portion 3 covers the laminated body 20 (storage cell 2), the number of parts is reduced, and a compact and lightweight power storage module 1 can be provided. .. As a result, it is possible to meet the market demand for being compact and lightweight, which can withstand harsh environments such as outdoors, and it is possible to provide a power storage module 1 applicable to various products.

The dimensions and shape of the power storage module 1 according to the first embodiment can be changed as appropriate. For example, in the first embodiment, the wiring 5 (51, 52) is formed from the left side surface of the resin mold body 3. However, the wiring 5 (51, 52) may protrude from another portion of the resin molded body 3. FIG. 6 is a perspective view of the resin molded body 1A according to the modified example of the first embodiment. As shown in FIG. 6, the wiring 5 (51, 52) may protrude from the upper surface of the resin molded body 1A. In this case, instead of forming the notch 4122 on the side surface 42 of the housing 4, a notch or a hole is formed in the lid 42, and the wirings 51 and 52 are formed in the notch and the hole. The end portion to which the wiring connector 6 is attached may be inserted, and the individual end portions may be formed so that the outside of the case 41 is pulled out.

(Second Embodiment)
[Structure of power storage module according to the second embodiment]
Hereinafter, the configuration of the power storage module according to the second embodiment will be described in detail with reference to FIGS. 7 to 11. FIG. 7 is a perspective view of the power storage module according to the second embodiment. FIG. 8 is a perspective view of the power storage module shown in FIG. 7 showing the internal structure. FIG. 9 is a perspective view of the resin mold shown in FIG. FIG. 10 is a front side view of the resin mold shown in FIG. FIG. 11 is a cross-sectional view taken along the line BB of the resin mold shown in FIG.

Similar to the power storage module 1 according to the first embodiment, the power storage module 1 ′ according to the second embodiment also has a power storage cell 2 and a resin potting portion 3 ′ housed in a housing 4 ′. .. Further, the configuration of the power storage cell 2 and the laminated body 20 according to the second embodiment is the same as the configuration of the power storage cell 2 and the laminated body 20 of the power storage module 1 according to the first embodiment. That is, the power storage cell 2 according to the second embodiment also has a charge / discharge charge storage element (not shown), an electrolytic solution (not shown), and a positive electrode terminal 21 and a negative electrode terminal 22 connected to the power storage element (not shown). And the exterior body 23 that stores the power storage element (not shown) and the electrolytic solution (not shown), and also stores the positive electrode terminal 21 and the negative electrode terminal 22 so that one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22 protrude. It has. The exterior body 23 houses the positive electrode terminal 21 and the negative electrode terminal 22 so that one end of the positive electrode terminal 21 protrudes from one side and one end of the negative electrode terminal 22 protrudes from the other side, as in the first embodiment. .. Further, the laminated body 20 according to the second embodiment is also configured by laminating a plurality of the storage cells 2. Further, also in the laminate 20 according to the second embodiment, the tip of the positive electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the tip of the negative electrode terminal 22C are By being welded (by welding one end of the positive electrode terminal 21 of at least one storage cell 2 and one end of the negative electrode terminal 22 of the other storage cell 2), a plurality of storage cells 2 are connected in series. ing. In addition, in FIGS. 7 to 11, the members having the same reference numerals as those of the first embodiment have the same configurations as the members of the first embodiment.

Further, the power storage module 1'according to the second embodiment also includes a resin potting unit 3', like the power storage module 1 according to the first embodiment. Then, the resin potting portion 3'is a protruding position of one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22 (including one end of the welded positive electrode terminal and one end of the negative electrode terminal) and one end of the positive electrode terminal 21 of the exterior body 23. It is formed so as to cover the protruding position of one end of the negative electrode terminal 22 and the negative electrode terminal 22. Further, in the first embodiment, the housing 4 has a substantially rectangular parallelepiped shape and has a case 41 and a lid portion 42. Similarly, in the second embodiment, the housing 4'has a substantially rectangular parallelepiped shape and the case 41. It has a ′ and a lid portion 42 ′.

The power storage module 1'according to the second embodiment is different from the power storage module 1 according to the first embodiment as follows. (I) In the first embodiment, the resin potting portion 3 covers the entire laminated body 20, but in the second embodiment, the resin potting portion 3'covers only a part of the laminated body 20. As a result, the configuration of the resin mold body 30'according to the second embodiment is different from the configuration of the resin mold body 30 according to the first embodiment. (Ii) In the power storage module 1 according to the first embodiment, the housing 4 is arranged so that the lid portion 42 faces upward, but in the power storage module 1'according to the second embodiment, the lid portion 42'is arranged. The difference is that they are arranged so that they face to the left. (Iii) In the first embodiment, a notch 4122 for pulling out the two wirings 5 is formed in the case 41 (the rear upper corner on the left side surface 412), but in the second embodiment, the notch is formed. The difference is that the notch portion 422 is formed in the middle at the lower corner of the lid portion 42'instead of the portion 4122. (Iv) In the power storage module 1 according to the first embodiment, the laminated body 20 is arranged so that the stacking directions of the plurality of power storage cells 2 are in the vertical direction. The difference is that the laminated body 20 is arranged so that the stacking direction of the plurality of storage cells 2 is in the front-rear direction.

The difference between the power storage module 1 ′ according to the second embodiment described above and the power storage module 1 according to the first embodiment will be described in detail below. In the first embodiment, by covering the entire laminated body 20, the resin potting portion 3'contains one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22, and one side (right side) and the other side of the exterior body 23. At least the (left side) part can be covered. On the other hand, in the second embodiment, the resin potting portion 3'covers only the portions of the laminated body 20 on the protruding side (upper side and lower side) of the positive electrode terminal 21 and the negative electrode terminal 22. Has the effect of. More specifically, the resin potting portion 3'consists of two resin potting parts 31. In the second embodiment, in the laminated body 20, a plurality of power storage cells 2 are laminated in the front-rear direction as described above, whereby the positive electrode terminal 21 and the negative electrode terminal 22 are placed from either the upper side or the lower side of the exterior body 23. Arranged so as to protrude (extend).

The lower part of the laminated body 20 is included in one of the two resin potting parts 31, and the lower part of the laminated body 20 is covered with the one resin potting part 31. Further, the other one of the two resin potting parts 31 contains the upper part of the laminated body 20, and the lower part of the laminated body 20 is covered with the one resin potting part 31. As a result, it is formed so as to cover at least one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22, and one side (upper side) and the other side (lower side) of the exterior body 23. Therefore, in the second embodiment, the resin molded body 30'has a shape in which the resin potting portion 3'is formed by molding only on the upper portion and the lower portion of the laminated body 20. That is, the resin molded body 30'has a shape in which the resin potting portion 3'is not formed in the central portion of the laminated body 20 in the vertical direction. In this way, in the resin molded body 30', one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22 and one side (upper side) and the other side (lower side) portion of the exterior body 23 are resin-molded. It is covered with the potting part 3'.

The resin mold body 30'according to the second embodiment includes a wiring 5 to which the wiring connector 6 is attached, having the same configuration as the resin mold body 30 according to the first embodiment. The resin mold body 30'is housed in the housing 4'so that the wiring 5 is located on the lower left portion of the resin mold body 30', and the wiring 5 is pulled out from the lower left portion of the housing 4'. More specifically,
Two wires 5 are pulled out from the cutout portion 422 of the lid portion 42'. The width and depth of the housing 4 are the same, and the height direction is shorter than the width and depth dimensions. However, in the second embodiment, the shape of the housing 4'is , The width and depth dimensions are different (the depth dimension is shorter), and the height dimension is formed larger than the width and depth dimension. However, the dimensions and the like of the housing 4'can be changed as appropriate.

[Manufacturing method of power storage module according to the second embodiment]
The manufacturing method of the power storage module 1'according to the second embodiment is described below. The laminated body 20 is manufactured by the same method as that of the first embodiment, two wirings 5 are electrically connected to the laminated body 20 and a wiring connector 6 is connected to the wiring 5 by the same method as that of the first embodiment. do. Here, the mold used for manufacturing the resin molded body 30'is different from the manufacturing method of the power storage module 1 according to the first embodiment. For example, a mold 100 as shown in FIG. 12 is prepared. The mold 100 can be divided into two mold members 100A and 100B. Since the resin potting portion 3'consists of two resin potting parts 31, one mold 100 is prepared for each resin potting part 31. Two molds 100 are attached to the laminate 20 so that the upper portion and the lower portion of the laminate 20 are sandwiched between the mold member 100A and the mold member 100B, and each mold 100 is filled with a resin potting material. After that, the resin potting material is cured after a lapse of a predetermined time, and the mold member 100A and the mold member 100B are removed, so that the upper portion and the lower portion of the laminate 100 can be covered with the resin potting part 31. In this way, the resin molded body 30'can be manufactured. Although the method for producing the resin molded body 30'by injection molding has been described above, the resin molded body 30'can be produced by another method. As another method, a container is prepared, and the resin potting material is filled in the container with the lower portion of the laminate 20 arranged in the container. After that, the resin potting material is cured by allowing a predetermined time to elapse, and then the laminate 20 is taken out from the container to manufacture one of the two resin potting parts 31. Then, the container is filled with the resin potting material in a state where the upper portion of the laminate 20 is arranged in the container. After that, the resin potting material is cured by allowing a predetermined time to elapse, and then the laminate 20 is taken out from the container to manufacture the other one of the two resin potting parts 31. The resin molded body 30'can also be manufactured by this method.

The case 41'and the lid portion 42'(the lid portion 42'with the notch portion 422 formed) are manufactured by mold molding or the like. Then, the resin mold body 30'is put into the case 41'. Here, the resin mold body 30'is put in the case 41 so that the wirings 51 and 52 are located at the lower left, and the wiring connector 6 of the wirings 51 and 52 fits in the cutout portion 422 of the lid portion 42'. The lid portion 42'is placed so as to close the opening on the left portion of the case 41, and the screw 43 is screwed into the bent portion 4121 from the left side of the lid portion 42 through the screw fixing hole 421. As a result, the storage module 1 in which the lid portion 42'is fixed to the case 41' and the resin molded body 30'is housed in the housing 4'is manufactured.

According to the configuration of the power storage module 1'according to the second embodiment described above, since the resin potting portion 3'covers a part (lower part and upper part) of the laminated body 20, the power storage module 1 according to the first embodiment is used. It has the same effect. Specifically, it is difficult for other members or foreign matter to come into contact with the positive electrode terminal 21 or the negative electrode terminal 22 of the power storage cell 2 to cause a short circuit or leakage of the electrolytic solution (not shown). Further, it is possible to provide a power storage module 1'excellent in rust prevention. As a result, the storage module 1'can be used in a harsh environment such as outdoors and has a long life with a simple configuration in which the resin potting portion 3'covers the laminated body 20 (storage cell 2). Further, since such an effect can be realized by a simple configuration in which the resin potting portion 3'covers the laminated body 20 (storage cell 2), the number of parts is reduced, and a compact and lightweight power storage module 1'is provided. Can be done. Further, in the power storage module 1 ′ according to the second embodiment, since only a part of the laminated body 20 is covered with the resin potting portion 3 ′, the power storage of the first embodiment covering the entire laminated body 20 with the resin potting portion 3 ′. It is possible to provide a power storage module 1'which is even lighter and cheaper than the module 1.

(Third Embodiment)
[Structure of power storage module according to the third embodiment]
Hereinafter, the configuration of the power storage module according to the second embodiment will be described in detail with reference to FIGS. 13 to 15. FIG. 13 is an exploded view of the power storage module according to the third embodiment. FIG. 14 is a cross-sectional view of the power storage module according to the third embodiment. FIG. 15 is a cross-sectional view of the power storage module according to the third embodiment in which the cross section at the position CC shown in FIG. 14 is visually recognized from the direction of the arrow. In FIG. 15, the wiring 5 is omitted for the sake of easy visibility of the drawing.

In the power storage module 1 ″ according to the third embodiment, the power storage cell 2 and the resin potting portion 3 ″ are housed in the housing 4 ″, similarly to the power storage modules 1 and 1 ′ according to the first and second embodiments. Further, the configuration of the power storage cell 2 and the laminate 20 according to the second embodiment is also the same as that of the power storage cell 2 and the stack 20 of the power storage modules 1 and 1 ′ according to the first and second embodiments. The configuration is the same. That is, the power storage cell 2 according to the second embodiment also has a chargeable / dischargeable power storage element (not shown), an electrolytic solution (not shown), and a positive electrode connected to the power storage element (not shown). The terminal 21, the negative electrode terminal 22, the power storage element (not shown) and the electrolytic solution (not shown) are stored, and one end of the positive electrode terminal 21 protrudes from one side and one end of the negative electrode terminal 22 protrudes from the other side. A positive electrode terminal 21 and an exterior body 23 for accommodating the negative electrode terminal 22 are provided in the above. Further, the laminated body 20 according to the second embodiment is also configured by laminating a plurality of the storage cells 2. Also in the laminate 20 according to the second embodiment, the tip of the positive electrode terminal 21B and the tip of the negative electrode terminal 22A, the tip of the positive electrode terminal 21C and the tip of the negative electrode terminal 22B, the tip of the positive electrode terminal 21D and the tip of the negative electrode terminal 22C are welded. (By welding one end of the positive electrode terminal 21 of at least one storage cell 2 and one end of the negative electrode terminal 22 of the other storage cell 2), a plurality of storage cells 2 are connected in series. Note that, in FIGS. 13 to 15, the members having the same reference numerals as those of the first embodiment or the second embodiment have the same configurations as the members of the first embodiment or the second embodiment.

Further, the power storage module 1 ″ according to the third embodiment also includes a resin potting unit 3 ′ like the power storage module 1 according to the first embodiment and the power storage module 1 ′ according to the second embodiment, and resin potting. Part 3 ″ is a protrusion position and a negative electrode of one end of the positive electrode terminal 21 and one end of the negative electrode terminal 23 (including one end of the welded positive electrode terminal 21 and one end of the negative electrode terminal 23) and one end of the positive electrode terminal 21 in the exterior body 23. It is formed so as to cover the protruding position of one end of the terminal 23. Further, in the first and second embodiments, the housings 4 and 4'have a substantially rectangular parallelepiped shape and have cases 41 and 41'and lids 42 and 42'. The body 4 ″ has a substantially rectangular parallelepiped shape, and has a case 41 ″ and a lid portion 42 ″.

The difference between the power storage module 1 ″ according to the third embodiment and the power storage module 1 according to the first embodiment and the power storage module 1 ′ according to the second embodiment is as follows. In the second embodiment, the resin molded bodies 30 and 30'are manufactured in advance, and the storage modules 1 and 1'are manufactured by storing the resin molded bodies 30 and 30'in the housings 4 and 4'. On the other hand, in the third embodiment, the laminate 20 is housed in the housing 4 ″ and attached, and the resin potting material is poured into the housing 4 ″ to perform resin potting in the housing 4 ″. Part 3 is manufactured. (Ii) The power storage modules 1 and 1'according to the first and second embodiments do not include a protection circuit board 7 (battery management system board) for preventing overcharging and overdischarging of a plurality of power storage cells 2. However, the power storage module 1 ″ according to the third embodiment is different in that the protection circuit board 7 is provided. (Iii) In the third embodiment, unlike the first and second embodiments, the lid portion 42 ″ is provided. , Has a structure to which the protection circuit board 7 can be attached.

The differences between the power storage module 1 ″ according to the third embodiment described above and the power storage modules 1 and 1 ′ according to the first and second embodiments will be described in detail below. In the first embodiment, as described above. The laminate 20 is attached to the housing 4 ″. The mounting structure of the laminated body 20 will be described below. First, the shape of the housing 4 ″ will be described. The housing 4 ″ has the same shape as the housing 4 of the power storage module 1 according to the first embodiment except for the following points. The case 41 of the housing 4 has a bent portion 4121 extending horizontally inward from the upper edge of the front and rear side surfaces 412, whereas the case 41 ″ of the housing 4 ″ has a bottom surface 412 instead of the bent portion 4121. It has two first standing members 4111 standing up from the leading edge and two first standing members 4111 standing up from the trailing edge. The two first standing members 4111 standing up from the leading edge are at the left end of the bottom surface 412 ″. And is formed at the right end, and is integrally formed with the front side surface 412 "along the front side surface 412". The two first standing members 4111 that stand up from the trailing edge are formed at the left end and the right end of the bottom surface 412 ", and are integrally formed with the rear side surface 412" along the rear side surface 412 ". 1 At the upper end of the standing member 4111, a mounting hole 4111A for mounting the lid 41 ″ is formed. Further, inside the first standing member 4111 on the bottom surface 412 ", two second standing members 4112 standing up from the leading edge are integrally formed with the front side surface 412" along the front side surface 412 ". Further, inside the first standing member 4111 on the bottom surface 412 ", two second standing members 4112 standing up from the trailing edge are integrally formed with the rear side surface 412" along the rear side surface 412 ". Has been done. A mounting hole 4112A for mounting the fixing plate 8 described later is formed at the upper end of the second standing member 4112.

The laminate 20 is arranged on the bottom surface 412 "(bottom) of the case 41", and is adjacent to the laminate 20 on the side opposite to the bottom surface 412 "(bottom) of the case 41", for example, a flat plate made of resin. A quadrangular fixing plate 8 is arranged, and the fixing plate 8 is fixed to the case 41 ″. The fixing plate 8 may be made of metal instead of resin. More specifically, when connected, it is fixed. The plate 8 is a substantially quadrangular member in which a substantially quadrangular hole 81 is formed in the central portion in a plan view, and a central bulging portion (a power storage element (not shown)) in the laminated body 20 is arranged in the hole 81. The shape of the fixing plate 8 is not limited to a quadrangle, and the holes 81 do not necessarily have to be formed. In addition, two holes 81 are formed on the front edge and the trailing edge of the fixing plate 8, respectively. Through the formed screw fixing hole 82, the screw 83 is fixed to the mounting hole 4112A of the second standing member 4112 of the case 41 ″. By fixing the fixing plate 8 to the case 41 ″ in this way, the laminate 20 can be sandwiched between the bottom surface 412 ″ of the case 41 ″ and the fixing plate 8 and fixed so as not to come out of the case inside 41 ″. You can. With such a simple configuration, a plurality of storage cells 2 can be fixed in the case 41 ".

In the third embodiment, the resin potting portion 3 ″ is formed so as to cover the entire laminated body 20 and the fixing plate 8. More specifically, the resin potting portion 3 ″ is formed in the case 41 ″. It is formed from the bottom surface 412 "to a predetermined position (filling position). The filling position is a position above the arrangement position of the fixing plate 8. The position shown by the diagonal line in FIG. 14 indicates the position where the resin potting portion 3 "is formed. In this way, the resin potting portion 3" covers the entire laminate 20 and the fixing plate 8, so that the resin potting portion 3 "is formed. The sealing property of the resin potting portion 3 ″ is improved. This makes it possible to further improve the leakage of the electrolytic solution (not shown) from the power storage cell 2, the waterproof property and the moisture proof property, and the entire laminate 20. The fixing plate 8 and the fixing plate 8 can also be fixed to each other by the resin potting portion 3 ″, and the laminated body 20 can be firmly fixed so as not to come out of the case 41 ″.

One end of the two wires 5 (51, 52) connected to the laminate 20 is pulled out from the resin potting portion 3 ″, and is protected above the resin potting portion 3 ″ in the case 41 ″. The circuit board 7 is arranged, and the protection circuit board 7 is electrically connected to the laminate 20 by being electrically connected to the other ends of the two wirings 2. According to this configuration, the case 41 ″ When the resin potting material is filled therein to form the resin potting portion 3 ″, the protective circuit board 7 does not interfere with the formation of the resin potting portion 3 ″, and the resin potting portion 3 ″ can be formed satisfactorily.

The protection circuit board 7 is fixed to the lower surface of the lid portion 42C by screwing or the like. In this way, the lid portion 42 "of the case 41" is arranged above the protection circuit board 7 so as to be adjacent to the protection circuit board 7, and the lid portion 42 "is fixed to the case 41". The lid portion 42 "is fixed to the mounting hole 4112A of the second standing member 4112 of the housing 4" by the screw 43 via the screw fixing hole 421. The protection circuit board 7 can be attached between the lid portion 42 "and the resin potting portion 3" simply by fixing the lid portion 42 "to the case 41", and the protection circuit board 7 is fixed with a small number of parts. Can be done. Thereby, an inexpensive, compact and lightweight power storage module 1 ″ can be provided. Further, the protection circuit board 7 is arranged above the case 41 ″, and the protection circuit board 7 can be opened by opening the lid portion 42 ″. Since it is exposed, maintenance of the protection circuit board 7 can be easily performed.

One end of the wiring 5A (51A, 52A) is electrically connected to the protection circuit board 7. The wiring connector 6 is electrically connected to the other end of the wiring 5A (51A, 52A), and the end of the wiring 5A to which the wiring connector 6 is connected is from the notch 4122 to the outside of the housing 4 ″. The lid portion 42 ″ has a protruding portion 423 that stands upward from its left edge and protrudes to the left, and also has a protruding portion 423 that stands upward from its right edge and protrudes to the right. Have. Three holes 4231 are formed at substantially equal intervals in these protruding portions 323. Through these holes 4231, it can be attached to another device with a screw or the like.

[Manufacturing method of power storage module according to the third embodiment]
The manufacturing method of the power storage module 1 ″ according to the third embodiment is described below. The laminated body 20 is manufactured by the same method as in the first and second embodiments, and by the same method as in the first and second embodiments. , Two wirings 5 are electrically connected to the laminated body 20. The wiring connector 6 is not connected to the wiring 5. Then, the laminated body 20 is arranged on the bottom surface 411 "of the case 41" to form the laminated body. 20 is stored in the case 41 ". The fixing plate 8 is arranged on the laminated body 20, and the fixing plate 8 is fixed to the mounting hole 4112A of the second standing member 4112 of the housing 4 ″ by the screw 83 via the hole 82 for fixing the screw. In this state, the case 41 ″ is filled with the resin potting material. Here, the resin potting material is filled up to a position (filling position) above the fixing plate 8, and one end of the wiring 5 is located above the filling portion of the resin potting material. As a result, the resin potting portion 3 "can be formed from the bottom surface 411" of the case 41 "to the filling position.

After that, the protection circuit board 7 is attached to the lower surface of the lid portion 42 ″ by screwing, and then one end of the wiring 5 (51, 52) is electrically connected to the protection circuit board 7. Further, the wiring 5A (51A, 52A) is connected. ) Is electrically connected to the protection circuit board 7. The end of the wiring 5A to which the wiring connector 6 is attached is pulled out from the notch 4122 to the case 41 ″, and the lid 42 ″ is screwed. It is fixed to the mounting hole 4111A of the first standing member 4111 of the housing 4 ″ by the screw 43 through the hole 421 for stopping. As a result, the lid portion 42 ″ is fixed to the case 41 ″, and the power storage module 1 ″ is manufactured.

According to the configuration of the power storage module 1 ″ according to the third embodiment described above, since the laminated body 20 is covered by the resin potting portion 3 ′, the same as the power storage modules 1 and 1 ′ according to the first and second embodiments. It is effective. Specifically, it is difficult for other members or foreign matter to come into contact with the positive electrode terminal 21 or the negative electrode terminal 22 of the power storage cell 2 to cause a short circuit or leakage of the electrolytic solution (not shown), and it is waterproof and moisture-proof. , A power storage module 1 "excellent in rust resistance and earthquake resistance can be provided. As a result, the storage module 1 "can be used in a harsh environment such as outdoors and has a long life with a simple configuration in which the resin potting portion 3 covers the laminated body 20 (storage cell 2). Since such an effect can be realized by a simple configuration in which the laminate 20 (storage cell 2) is covered with the resin potting portion 3 ", the number of parts is reduced, and a compact and lightweight power storage module 1" can be provided. Further, in the power storage module 1 ″ according to the third embodiment, the laminated body 20 can be more firmly attached to the case 41 ″ with a simple configuration. Further, the lid portion 42 ″ is an attachment member of the protection circuit board 7. Therefore, although the protection circuit board 7 is provided, the number of parts is small and the power storage module 1 ″ can be configured.

The above-described embodiment is an example of an embodiment to which the present invention is applied, and the configuration such as material, number, arrangement, etc. can be appropriately changed.

(1) In the power storage modules 1, 1 ′, 1 ″ according to the first to third embodiments, the positive electrode terminal 21 and the negative electrode terminal 22 are directly welded in the laminated body 20, but other members are interposed. In addition, although the laminated body 20 in which a plurality of storage cells 2 are laminated is mounted, it is not always necessary to stack the plurality of storage cells 2 and the plurality of storage cells 2 are arranged in the horizontal direction. Further, the number of power storage cells 2 mounted on the power storage modules 1, 1'1 "is not limited to four, and the number of power storage cells 2 more than four or less than four may be arranged. It may be installed. It may be configured to mount a single storage cell 2.

(2) The shapes of the housings 4, 4 ′, and 4 ″ related to the power storage modules 1, 1 ′, 1 ″ according to the first to third embodiments can be changed as appropriate, and for example, the notch portion 4122, Instead of 422, a hole may be formed.

(3) In the housings 4, 4', 4 "related to the power storage modules 1, 1', 1" according to the first to third embodiments, the right side and the left side, or the upper side of the exterior body 23 One end of the positive electrode terminal 21 protrudes from either one of the lower side and the lower side (“one side” of the present invention), and one end of the negative electrode terminal 22 protrudes from the other side, but this is not the case. It is sufficient that one end of the positive electrode terminal 21 protrudes from any one of the right side, the left side, the front side, and the rear side of the exterior body 23, and one end of the negative electrode terminal 22 protrudes from the other side. Further, one end of the positive electrode terminal 21 and one end of the negative electrode terminal 22 or one end of the positive electrode terminal 21 protrudes from one side of the exterior body 23 from another position on one side, and one end of the negative electrode terminal 22 is the positive electrode terminal 21 on one side. It may protrude from a position different from the protruding position of one end of the. For example, the storage cell 2 may be formed so that the positive electrode terminal 21 and the negative electrode terminal 22 project side by side on the left side of the storage cell 2. In this case, when the laminated body 20 is constructed, the positive electrode terminal 21 is arranged in the front and the negative electrode terminal 22 is arranged in the rear in the electricity storage cell 2A, and the positive electrode terminal in the electricity storage cell 2B arranged on the electricity storage cell 2A. The positive electrode terminals 21 and the negative electrode terminals 22 are alternately arranged in the vertical direction, such that 21 is arranged at the rear and the negative electrode terminals 22 are arranged at the front. In this state, one end of the positive electrode terminal 21 of at least one storage cell 2 in the laminated body 20 and one end of the negative electrode terminal 22 of the other storage cell 2 are welded, so that the plurality of storage cells 2 are connected in series. NS. The resin potting portions 3, 3 ′, 3 ″ are formed so as to cover one end of the welded positive electrode terminal 21 and one end of the negative electrode terminal 22.

(4) The formation position (filling position) of the resin potting portion 3 ″ in the power storage module 1 according to the third embodiment shown in FIG. 14 is merely an example, and may be higher or lower.

1, 1 ′, 1 ″ power storage module 2 power storage cell 20 laminated body 3, 3 ′, 3 ″ resin potting portion 30, 30 ′ resin mold body 4, 4 ′, 4 ″ housing 41, 41 ′, 41 ″ case 42 , 42', 42 ″ Cover 7 Protective circuit board 8 Fixing plate

Claims (9)

A charge / dischargeable power storage element, an electrolytic solution, a positive electrode terminal and a negative electrode terminal connected to the power storage element, the power storage element and the electrolytic solution are stored, and one end of the positive electrode terminal and one end of the negative electrode terminal are stored. A power storage cell including the positive electrode terminal and an exterior body for accommodating the negative electrode terminal so as to project.
A resin potting portion formed so as to cover at least one end of the positive electrode terminal and one end of the negative electrode terminal, and the protruding position of one end of the positive electrode terminal and the protruding position of one end of the negative electrode terminal in the exterior body is provided. ,
A power storage module characterized by this. In the exterior body, one end of the positive electrode terminal protrudes from one side and one end of the negative electrode terminal protrudes from the other side, or one end of the positive electrode terminal protrudes from one side and one end of the negative electrode terminal is said. The positive electrode terminal and the negative electrode terminal are housed so as to project from a position different from the protruding position of one end of the positive electrode terminal on one side.
A plurality of the storage cells are laminated to form a laminated body, and the laminated body is formed.
By welding one end of the positive electrode terminal of at least one storage cell in the laminated body and one end of the negative electrode terminal of the other storage cell, the plurality of storage cells are connected in series.
The resin potting portion is formed so as to cover one end of the welded positive electrode terminal and one end of the negative electrode terminal.
The power storage module according to claim 1. With more cases
A resin molded body in which one end of the positive electrode terminal and one end of the negative electrode terminal, a protruding position of one end of the positive electrode terminal and a protruding position of one end of the negative electrode terminal in the exterior body are resin-molded and covered with the resin potting portion. , Stored in the case,
The power storage module according to claim 2. With more cases
The laminate is placed on the bottom of the case and
A fixing plate is arranged on the side opposite to the bottom of the case so as to be adjacent to the laminated body, and the fixing plate is fixed to the case.
The power storage module according to claim 2. The resin potting portion covers the laminated body and the fixing plate.
The power storage module according to claim 4. A protective circuit board for preventing overcharging and overdischarging of the plurality of storage cells, which is electrically connected to the laminated body housed in the case, is further provided.
The protection circuit board is arranged above the resin potting portion.
The power storage module according to claim 5. A lid portion of the case is arranged above the protection circuit board so as to be adjacent to the protection circuit board, and the lid portion is fixed to the case.
The power storage module according to claim 6. The exterior body is made of a laminated film.
The power storage module according to any one of claims 1 to 7. The storage cell is any one of a lithium ion capacitor, an electric double layer capacitor, and a lithium ion battery.
The power storage module according to any one of claims 1 to 8.

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