KR102182221B1 - Wireless charging apparatus - Google Patents

Abstract

By improving the electrical connection structure and assembly structure of the component part, a stack in which a plurality of battery cells are stacked and electrically connected, a tray in which the plurality of stacks are accommodated and electrically connected, and a terminal portion connected to the stack is installed on one side, the plurality of trays It provides a power storage device comprising a compartment in which is accommodated, and a connection bar electrically connecting terminal portions between the trays.

Description

Power storage device {WIRELESS CHARGING APPARATUS}

The present disclosure relates to a power storage device.

For example, a power storage device is needed to build a smart grid, an intelligent power grid. The power storage device performs a function of storing the power produced by the power plant and transmitting it to the required place according to the demand pattern.

The power storage device has a structure in which trays in which a plurality of battery cells are accommodated are stacked in a housing and electrically connected. The trays loaded in the enclosure and the battery cells of each tray are electrically connected according to the required voltage configuration to form a circuit. For example, if the voltage of one battery tray is 25V and the total system voltage is 500V, 20 battery trays are connected in series to match the system voltage.

Accordingly, in order to configure the power storage device, a number of trays are stacked and electrically connected in one enclosure, and a plurality of battery cells are stacked and electrically connected to each tray. In addition, in the case of a large-capacity power storage device, a plurality of enclosures must be arranged and electrically connected.

Assembling a single power storage device by electrically connecting a plurality of battery cells is very complicated and cumbersome, and there is a high possibility that the device may be damaged due to incorrect assembly. Therefore, improving the electrical connection structure and the assembly structure of the constituent parts of the power storage device can provide advantages of preventing damage to the device and improving performance, as well as workability and convenience of use.

This task is to provide a power storage device with improved electrical connection structure and assembly structure of components.

The present task is to provide a power storage device with an improved connection structure between battery cells installed in a tray.

This task is to provide a power storage device that can effectively insulate between battery cells.

This task is to provide a power storage device with an improved terminal connection structure between the tray and the tray.

The present task is to provide a power storage device capable of covering and protecting the electrical connections of each stack provided inside the tray.

The present task is to provide a method of manufacturing a power storage device that can perform assembly work more simply and quickly.

The power storage device of the present embodiment includes a stack in which a plurality of battery cells are stacked and electrically connected, a tray in which the plurality of stacks are accommodated and electrically connected, and a terminal portion connected to the stack is installed on one side, and a compartment in which the plurality of trays are accommodated. And a connection bar electrically connecting terminal portions between the trays.

The box may include a frame that forms a skeleton and is provided with a plurality of racks to allow the tray to be stacked along a vertical direction, and a side plate detachably installed on the frame to form a side surface of the box.

The stack includes a pallet supporting and supporting the battery cells and stacked together in a vertical direction to form a space for accommodating the battery cells therebetween, and an electricity for electrically connecting the positive and negative terminals of each battery cell accommodated in the pallet. It may include a connection.

The pallet includes a plate on which the battery cells are placed and supported, a support part formed integrally at both ends of the plate and protruding upward and downward to contact a neighboring pallet and maintain a gap between the plate and the plate, respectively, on both sides of the support part. It may include at least one or more protrusions and grooves formed and coupled to neighboring pallets.

The electrical connection part forms a stepped part with a low height on the support part so that the positive terminal and the negative terminal of the battery cell are drawn outward through the stepped part, and alternately along the stacked pallets of the stack, on the outer surface of the support part of one pallet The positive and negative terminals of the battery cells are electrically connected to each other, and the positive and negative terminals of the battery cells arranged on the upper and lower sides with the pallet formed therebetween are bent toward the joint, respectively, and the joint A positive terminal and a negative terminal are respectively overlapped between neighboring battery cells to be electrically connected, and a connection plate is installed between the junction and the junction to electrically connect the adjacent junction.

In the electrical connection, a fastening hole is formed in the junction, and a hole is formed in a position corresponding to the fastening hole in the overlapping positive and negative terminals, and the connection plate and the positive and negative terminals pass through the hole. It may be a structure that is fixed to the junction through a bolt fastened to the fastening hole of the junction.

The connecting plate may electrically connect the stack provided in the tray and the stack.

The stack may further include a top plate installed on the top of the stacked pallet to cover the battery cells.

The upper plate includes a plate covering the battery cells of the uppermost pallet, a support portion formed integrally at both ends of the plate and protruding downward to contact the lower pallet, and a groove portion formed on the lower surface of the support portion and coupled to the protrusion of the pallet. I can.

The stack may further include a metal plate installed at the bottom of the stacked pallet.

The stack may further include a fixing part for fixing the stacked pallets.

The fixing unit may include at least one through hole formed at a tip of the pallet, and a coupling bar fitted along the through hole of the stacked pallet to fix the plurality of pallets.

The coupling bar may have a structure in which a hole for fastening bolts is formed at a tip end.

The coupling bar may be formed to have a length less than or equal to the length of the through hole along the vertical direction of the stack.

The through hole has a circular cross-sectional shape, and the coupling bar has a hollow cylindrical shape by bending both side ends to fit into the through hole, and both side ends are spaced apart from each other to face each other along the axial direction. have.

The through hole may be formed along a protrusion center of the support part.

The coupling bar may have a structure in which a protruding rib extends along the axial direction on a side surface, and a slit connected to the through hole is cut at a position corresponding to the protruding rib, and the protruding rib is fitted along the slit. have.

The stack may further include a front cover installed on the front side of the stack to cover and block the electrical connection.

The front cover may include a protrusion protruding toward the pin at a position corresponding to the pin formed on the pallet for mounting the connection plate.

A fitting portion is protruded on an outer surface of the support portion of the pallet, and a fitting groove portion is formed on an inner surface of the front cover to be fitted to the fitting portion, so that the fitting portion may be detachably coupled to the fitting portion.

The tray may further include a connection part connecting the stack and the stack.

The connection portion is formed integrally between a through hole formed in a pallet forming a stack, a pair of coupling bars fitted and installed respectively along the through hole of an adjacent stack, and integrally formed between the pair of coupling bars to connect the pair of coupling bars. It may include a connecting rib.

The coupling bar may have a structure in which a hole for fastening bolts is formed at a tip end.

The coupling bar may be formed to have a length less than the vertical length of the stack.

The through hole has a circular cross-sectional shape, and the coupling bar has a hollow cylindrical shape by bending both side ends to fit into the through hole, and both side ends are spaced apart from each other to face each other along the axial direction. have.

The through hole may be formed along a protrusion center of the support part.

The connection rib is formed continuously along the axial direction of the coupling bar, and the pallet has a structure in which a slit connected to the through hole is cut at a position corresponding to the connection rib, so that the connection rib is fitted along the slit. I can.

The tray may further include an insulating portion installed between the stack and the stack to insulate the stack.

The insulating part may have a size corresponding to the side of the stack in contact with the adjacent stack, and may include an insulating plate disposed on the side of the stack.

The terminal unit may include a connection bar electrically connected to the stack accommodated in the tray, a connection port for fixing the connection bar on the front of the tray, and a cover that is detachably installed on the open front of the connection port to block exposure of the connection bar. have.

The connection port has a hole in the center of the connection bar into which the connection bar is inserted, a groove is formed in the protruding front surface, and the cover has a protrusion protruding at a position corresponding to the groove, so that the protrusion is fitted into the groove and installed in the connection port. Can be.

One end of the connection bar is connected to the stack inside the tray, the other end is bent at a right angle through the hole of the connection port and fixed with bolts to the front of the connection port, and locking protrusions are formed on both sides of the inside of the hole. In the bar, a stepped jaw is formed in a portion corresponding to the locking jaw in a portion passing through the hole, and may be fitted between the locking jaws to be coupled.

The manufacturing method of this embodiment includes the steps of preparing a battery cell and a pallet, forming a hole in the positive terminal and the negative terminal of the battery cell and bending it at a right angle to process, loading the processed battery cell on a pallet, and battery cell It may include a step of sequentially stacking the supported pallets to form a stack, a fixing step of fixing the stacked pallets and between the stack and the stack, and an electrical connection step of electrically connecting each of the battery cells loaded in the stack. .

In the electrical connection step, alternately along the stacked pallets of the stack, joints in which the bent positive and negative terminals of the battery cells are electrically connected to each other are provided on the outer surface of the support part of one pallet, and the pallets on which the joints are formed are provided between the pallets. The positive and negative terminals of the battery cells placed at the top and bottom are respectively bent toward the junction so that the positive and negative terminals overlap each other between the battery cells adjacent to the junction to be electrically connected, and connect between the junction and the junction. Installing a plate may include the step of electrically connecting adjacent joints.

In the electrical connection step, the connection plate may be connected to the joint through a bolt that penetrates the hole of the positive terminal or the negative terminal and is fastened to the fastening hole of the joint.

It may further include mounting the front cover on the front of the stack.

The fixing step may include inserting a prepared coupling bar into a through hole formed in a pallet forming the stack, and inserting a pair of coupling bars connected by connecting ribs between through holes of adjacent stacks.

As described above, according to the present embodiment, it is possible to more easily perform the electrical connection work between the component parts.

In addition, battery cells are stacked more simply and effectively to form a stack, and the stacks can be connected and installed.

Accordingly, the assembly is easy and simple, so that the time and effort required for work can be reduced.

In addition, by insulating the stack and the stack, it is possible to effectively prevent an electrical short from occurring.

In addition, it is possible to cover and protect the electrical connection portions of each stack provided inside the tray, thereby preventing malfunction or damage.

1 is a schematic diagram showing a power storage device according to the present embodiment.
2 is a schematic diagram showing a tray of the power storage device according to the present embodiment.
3 is a schematic diagram showing a stack structure of the power storage device according to the present embodiment.
4 is a schematic side cross-sectional view showing a pallet of a stack according to the present embodiment.
5 is a schematic side cross-sectional view of a stack in the power storage device according to the present embodiment.
6 is a schematic diagram illustrating a state in which the stacks of the power storage device according to the present embodiment are electrically connected.
7 is a schematic cross-sectional plan view of a stack of the power storage device according to the present embodiment.
8 is a schematic diagram showing a stack assembly process of the power storage device according to the present embodiment.
9 is a schematic diagram showing a stacked structure of the power storage device according to the present embodiment.
10 is a schematic diagram showing a combination bar of the power storage device according to the present embodiment.
11 is a schematic diagram showing a state in which a coupling bar is installed between stacks of the power storage device according to the present embodiment.
12 is a schematic diagram showing the structure of a terminal portion of the power storage device according to the present embodiment.
13 is a diagram showing a configuration of a terminal unit according to the present embodiment.

Hereinafter, an embodiment of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later. The embodiments described later may be modified in various forms without departing from the concept and scope of the present invention. As far as possible, the same or similar parts are indicated using the same reference numerals in the drawings.

The terminology used below is only for referring to specific embodiments, and is not intended to limit the present invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising" as used in the specification specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the following examples are only preferred examples of the present invention and the present invention is not limited to the following examples.

1 schematically shows a power storage device according to this embodiment.

As shown, in the power storage device 100 of the present embodiment, a plurality of battery cells (see 30 in FIG. 3) are stacked to be electrically connected to each other, a stack 40, and a plurality of stacks 40 are accommodated and electrically connected. On one side, the tray 20 in which the terminal portion 80 connected to the stack 40 is installed, the housing 10 in which a plurality of trays 20 are accommodated, and a connection bar electrically connecting the terminal portion 80 between the trays 20 ( 16) may be included.

Accordingly, a number of battery cells 30 provided in the enclosure 10 are arranged in an orderly manner in a narrower space and electrically connected to effectively implement a large-capacity system.

The box 10 is a frame 12 provided with a plurality of racks so that the tray 20 can be loaded along the vertical direction and forms a skeleton, and a side plate that is detachably installed on the frame to form the side of the box 10 ( 14) may be included.

Hereinafter, the vertical direction or the vertical direction refers to the y-axis direction in FIG. 1, and the upper or upper part means the upper part along the y-axis direction based on the case where the enclosure 10 is placed on the floor, and the lower or the lower direction. Means downward along the y-axis direction.

The frame 12 may have a rectangular parallelepiped shape. In the frame, for example, a horizontal frame and a vertical frame may be connected at right angles to form a rectangular parallelepiped shape. The connection form or structure of the frame can be variously modified.

The side plate 14 may be attached and installed to the frame 12 when necessary to form a side surface of the housing 10. A large-capacity power storage device can be implemented by connecting a plurality of enclosures. When connecting a plurality of enclosures for a large-capacity power storage device, the side plate may be separated from the side of the enclosure and other enclosures may be directly connected to the side of the enclosure. In this case, the side plate 14 may be installed only on the side of the outermost compartment 10 of the compartment assembly connected in plurality.

The tray 20 is inserted into the box 10 through the open front surface of the box 10 and is seated on the rack formed in the frame 12. A tray 20 is inserted into each rack installed in the box 10 in a drawer type, and a plurality of trays 20 are stacked in the box 10 along the vertical direction.

Fig. 2 shows the tray of this embodiment.

As shown in FIG. 2, the tray 20 may be formed in a rectangular parallelepiped structure having a stack 40 accommodation space therein. A separate cover may be installed on the open top of the tray 20.

On the front of the tray 20, two terminal portions 80 electrically connected to the stack 40 are spaced apart and installed. The two terminal portions 80 may be, for example, a positive terminal portion connected to the positive electrode of the stack 40 and a negative terminal portion connected to the negative electrode of the stack 40. Hereinafter, the term terminal 80 may refer to both a positive terminal portion and a negative terminal portion.

A management circuit unit 22 connected to the stack 40 to manage the battery cells 30 may be installed at the front center of the tray 20. In addition, handles 24 that can be used when inserting or withdrawing the tray 20 into or withdrawing the tray 20 may be further installed at both front ends of the front of the tray 20.

Each of the trays 20 loaded in the compartment 10 is electrically connected through a connection bar 16 installed between the terminal portions 80. For example, the connection bar 16 may be connected and installed between the positive terminal portion of one tray 20 and the negative terminal portion of the adjacent tray 20. Accordingly, each tray 20 can be connected in series within the enclosure.

Inside the tray 20, a plurality of stacks 40 are loaded, and each stack 40 is electrically connected.

In the apparatus of the present embodiment, as shown in FIG. 2, eight stacks 40 may be arranged in a symmetrical form and stacked in one tray 20. The number and arrangement structure of the stacks 40 to be loaded in the tray 20 can be variously modified. In the tray 20, each stack 40 may be connected in series. Of the stacks 40 connected in series, the anode and the cathode of the stack 40 located at the ends are respectively connected to the two terminal portions 80 of the tray 20. Thus, it is possible to store or withdraw power to each stack 40 loaded on the tray 20 through the terminal unit 80.

Each of the stacks 40 loaded in the tray 20 may have the same structure.

Hereinafter, the structure of the stack will be described with reference to FIGS. 3 to 5.

As shown, the stack 40 of this embodiment supports and supports the battery cells 30 and is stacked with each other along the vertical direction to form a space for accommodating the battery cells 30 therebetween. ) May include an electrical connection for electrically connecting the positive terminal 32 and the negative terminal 34 of each battery cell 30 accommodated in ). The stack 40 may be formed by stacking a plurality of pallets 50 on which the battery cells 30 are supported. Accordingly, the plurality of battery cells 30 are stably supported between the pallets 50, so that the stack 40 can be formed by being stacked up and down.

Each of the plurality of pallets 50 constituting the stack 40 may be formed in the same shape.

As shown in FIG. 4, the pallet 50 of this embodiment is integrally formed at both ends of the plate 52 and the plate 52 on which the battery cells 30 are placed and supported, and protrudes in the vertical direction to neighboring At least one protrusion 56 that contacts the pallet 50 and maintains a gap between the plate 52 and the plate 52, and at least one protrusion 56 formed on both sides of the support 54 and coupled to the adjacent pallet 50 ) And the groove portion 57 may be included.

The plate 52 is a plate structure having a thin thickness, and may be formed to have a size corresponding to the battery cell 30 in the form of a pouch of an approximately square plate. A hole having a size smaller than that of the battery cell 30 may be formed in the center of the plate 52. Accordingly, while the weight of the pallet 50 can be minimized, the battery cell 30 can be stably supported and supported.

The support portion 54 is integrally formed at both ends of the plate 52. The support portion 54 is formed thick so as to protrude in the vertical direction with respect to the plate 52 to form a portion formed relatively high on the surface of the plate 52.

Thus, when the pallets 50 are stacked in the vertical direction, the support portions 54 of the pallets 50 adjacent to each other come into contact with each other, and a space between the plates 52 and the plates 52 of the neighboring pallets 50 Is formed. Accordingly, when the pallets 50 are stacked, the battery cells 30 can be stably placed in a space provided between the plates 52 and the plates 52 of the adjacent pallets 50. The protruding height of the support part 54 with respect to the plate 52 may be variously modified according to the thickness of the battery cell 30.

In addition, unlike the front and rear surfaces of the stack 40 (faces facing the x-axis direction in FIG. 3) that are in close contact with each other by the support portion 54, the side surfaces of the stack 40 (surfaces facing the z-axis direction in FIG. 3) Between the plate 52 and the plate 52 is open. Accordingly, when the battery cells 30 are supported by the pallet 50, heat generated from the battery cells 30 may be more easily radiated through the side of the stack 40 that is open.

Protrusions 56 and grooves 57 may be formed on the upper and lower surfaces of the support 54, respectively. The protrusion 56 is formed to protrude outward from the upper surface of the support portion 54, and the groove portion 57 is formed inwardly from the lower surface of the support portion 54. In this embodiment, the protrusion 56 and the groove 57 may be formed to face both sides of the support 54 at the same position. The protrusion 56 may be formed to have a size that can be forcibly fitted to the groove portion 57. The protrusion 56 and the groove 57 may be formed, for example, on the front edge of the support 54. The formation position or number of the protrusions 56 and the grooves 57 can be variously modified.

Accordingly, as shown in FIG. 4, when the pallet 50 is stacked, the protrusion 56 formed on the upper surface of the support part 54 of the pallet 50 located at the bottom is the support part 54 of the pallet 50 that is stacked above. ) It is fitted into the groove portion 57 formed on the lower surface. As the protrusions 56 and the grooves 57 of the neighboring support portions 54 are fitted between the stacked pallets 50 as described above, the stacking positions between the pallets 50 are aligned so that the stack 40 can be stably formed. .

Accordingly, by fitting the protrusions 56 and the grooves 57 between the pallets 50, the pallets can be accurately aligned and a stack can be formed.

The stack 40 may further include an upper plate 58 installed on the top of the stacked pallet 50 to cover the battery cells 30. The upper plate 58 may serve as an upper cover of the stack 40.

The upper plate 58 of this embodiment is integrally formed at both ends of the plate 52 and the plate 52 covering the battery cells 30 of the uppermost pallet 50, and protrudes downwardly to the lower pallet 50 and It may include a support portion 54 in contact, a groove portion 57 formed on a lower surface of the support portion 54 and coupled to the protrusion 56 of the pallet 50.

The plate 52 of the upper plate 58 may have the same structure as the plate 52 of the pallet 50 mentioned above. The support part 54 of the upper plate 58 may also be formed in a structure corresponding to the lower surface of the support part 54 of the pallet 50. That is, the upper plate 58 may also have a groove portion 57 formed at the lower end of the support portion. Thus, when the upper plate 58 is combined on the pallet 50 of the uppermost layer of the stack 40, the protrusion 56 formed on the upper surface of the support portion 54 of the uppermost pallet 50 is formed on the lower surface of the support portion 54 of the upper plate 58. The upper plate 58 is coupled to the top of the stack 40 while being aligned with the formed groove 57. Accordingly, the battery cells 30 placed on the uppermost pallet 50 of the stack 40 can be covered and protected by the upper plate 58.

In the support portion 54 of the upper plate 58, the upper surface of the portion in which the groove portion 57 is formed is depressed below the plate 52 to form a stepped surface 59. The stepped surface 59 prevents the bolt from protruding above the plate 52 when the bolt 78 is fastened with a groove 57 for fixing the stack 40. This structure will be described again later.

In addition to such a top plate mounting structure, by stacking another pallet on the top pallet of the stack without having a separate top plate, the stacked pallet can act as a top plate covering the battery cells.

Each of the battery cells 30 placed on the pallet 50 and stacked up and down are electrically connected to each other through electrical connections. As mentioned, the battery cell 30 has a shape of a pouch with a thin square thickness, and has a structure extending outwardly with a positive terminal 32 and a negative terminal 34 spaced apart at one end thereof.

The electrical connection part of this embodiment is electrically connected at the junction 60 of the pallet 50 by drawing the positive terminal 32 and the negative terminal 34 of the battery cell 30 toward the front of the pallet 50, and each junction A separate connection plate 64 may be installed between 60 to be electrically connected.

Hereinafter, a structure of the electrical connection unit electrically connecting the battery cells of the stack will be described.

In order to allow the positive terminal 32 and the negative terminal 34 of the battery cell 30 to be drawn out to the outside of the pallet 50, the support part 54 of the pallet 50 has a relatively higher height than the upper surface of the support part 54. A low step portion 55 is formed. Accordingly, when the pallets 50 are stacked, a gap is formed between the support portion 54 and the step portion 55 of the adjacent pallet. Accordingly, in a state in which the pallet 50 is stacked, the positive terminal 32 and the negative terminal 34 of the battery cell 30 can be drawn out toward the front of the pallet 50 through a gap made by the stepped portion 55. .

A junction 60 is formed on the pallets 50 alternately arranged along the stacked pallets 50 of the stack 40. That is, along the stacked pallets, the pallets forming the junction and the pallets not forming the junction are alternately arranged, so that every other junction is formed.

The bonding portion 60 may be formed on the entire surface of the support portion 54 of the pallet. The positive terminal 32 or the negative terminal 34 of the adjacent battery cells 30 are electrically connected to each other with the pallet between the junction 60. A bolt fastening hole 61 may be formed in the junction 60 so that the bolt 65 for fixing the terminal may be fastened.

The positive terminal 32 and the negative terminal 34 of the battery cell 30 disposed above and below the pallet 50 with the junction 60 formed therebetween are formed to be bent toward the junction 60, respectively. Accordingly, the positive terminal 32 and the negative terminal 34 may be electrically connected between the battery cells 30 adjacent to each other in the junction 60 by overlapping each other according to the polarity. For example, on the pallet 50, two junctions 60 are formed to be spaced apart according to the positions of the positive terminal 32 and the negative terminal 34 of the battery cell 30. The two battery cells 30 arranged vertically with the pallet 50 interposed therebetween are arranged such that terminals of the same polarity face each other. Accordingly, the positive terminal 32 and the positive terminal 32 of the two adjacent battery cells 30 are bent and connected to one junction 60 at the same position, and the negative terminal 34 and the negative terminal 34 are also different. It is bent and joined by the side joint 60. Accordingly, terminals of the same polarity are joined to the junction part 60. In this way, it is possible to configure the stack 40 with a desired power capacity by easily connecting in parallel between the adjacent battery cells 30 with the pallet 50 interposed therebetween.

In this embodiment, the positive terminal 32 and the negative terminal 34 of the neighboring battery cells 30 are aligned with the fastening hole 61 of the junction 60 on the overlapping surface of each other. This can be formed through. Accordingly, the bolt 65 passes through the hole 62 of the positive terminal 32 and the negative terminal 34 and is fastened to the fastening hole 61 in the junction 60 to form the positive terminal 32 and the negative terminal 34. Is fixed by bonding.

A connection plate 64 is installed between the junction 60 and the junction 60 and between the stack 40 and the junction 60 of the stack 40 to electrically connect the adjacent junction 60. The connection plate 64 has a hole formed at a position corresponding to the fastening hole 61 of the joint 60 so that the bolt 65 can pass therethrough. Accordingly, the connection plate 64 is fixed to the junction 60 of the pallet 50 via bolts 65. The bolt 65 pressurizes the connection plate 64 to the joint 60. As the connecting plate 64 is pressed by the bolt 65, the positive terminal 32, the negative terminal 34, and the positive plate 64 of the adjacent battery cells 30 are closely pressed and electrically connected to each other.

In this way, the positive terminal 32 and the negative terminal 34 of the stacked battery cells 30 are bent into two junctions 60 of the pallet 50 positioned therebetween to bond to each other between the terminals, and the stack 40 By connecting the connection plates 64 between them, each battery cell 30 of the stack 40 can be electrically connected more easily.

In addition, as shown in FIG. 3, pins 66 may be protruded on the front surface of the support portion 54 of the pallet 50 so that the connection plates 64 can be installed at correct positions on both sides of the joint portion 60. A pinhole is formed in the connection plate 64 at a position corresponding to the pin 66. Accordingly, when the pin hole formed in the connection plate 64 is fitted with the pin 66 formed on the pallet 50, the connection plate 64 is aligned exactly to the installation position of the pallet 50. In this state, the connecting plate 64 can be easily fixed and installed with bolts to the junction 60 of the pallet 50.

The connection plate 64 is a plate structure, and may be formed in various sizes according to a position installed in the stack 40 or an electrical connection structure between the stacks 40.

Hereinafter, the electrical connection structure of each stack 40 by the connection plate 64 will be described with reference to FIGS. 6 to 8.

6 to 8 show a state in which four stacks 40 are disposed in the lateral direction so as to be stacked on one side of the tray 20 and electrically connected through the connection plate 64 according to the present embodiment. Although not shown, the four stacks 40 disposed on the other side of the tray 20 also have the same electrical connection structure through the connection plate 64.

In this embodiment, the stacks 40 accommodated in the tray 20 may be connected in series. In this embodiment, one stack 40 has a structure in which eight battery cells 30 are stacked, and is formed by stacking eight pallets 50 supporting the battery cells. Among the eight pallets 50, the pallets in which the junction part 60 is formed so that the battery cells 30 are connected are alternately arranged along the stacked pallets 50. Thus, there are four pallets 50 in which the junction 60 is formed in one stack 40. Since two junctions 60 forming a pair of anode and cathode are formed on each of the four pallets 50, a total of 4 pairs of 8 junctions 60 are formed in the stack 40. For convenience of description, the two joints 60 disposed on the left and right sides of one pallet 50 may be referred to as a pair.

For a series connection between junctions in one stack 40, the lower two pairs of junctions 60 and the upper two pairs of junctions 60 may be disposed with different polarities along the vertical direction. For example, in the lower two pairs of junctions 60, the junction 60 on the left and the junction 60 on the right are respectively formed of an anode and a cathode, and the junction 60 of the upper two pairs is a junction 60 on the left and right. ) May be formed of opposite cathode and anode respectively.

Accordingly, when a plurality of stacks 40 are disposed along the lateral direction, junctions having different polarities are disposed between adjacent stacks and stacks. That is, between the stack and the stack, the anode and the cathode are disposed adjacent to each other between the upper two pairs of junctions 60, and the cathode and the anode are disposed immediately adjacent between the lower two pairs of junctions 60. Accordingly, by separating the connection plate 64 up and down and continuously installing it between the two stacks 40, it is possible to simply connect the plurality of stacks 40 in series.

In the case of this embodiment, as shown in FIG. 6, the connection plates 64 between the upper two pairs of joints 60 and the lower two pairs of joints 60 in the vertical direction between the adjacent stacks 40 ), and in the outermost stack 40, the upper two pairs of junctions 60 and the lower two pairs of junctions 60 may be connected together by a connection plate 64.

To this end, the connection plate 64 may have a length covering between the adjacent junction 60 and the junction 60 along the vertical direction of the stack 40. In addition, in the case of the connection plate 64 connecting the stack 40 and the stack 40, in the lateral direction, between the junction 60 of one stack 40 and the junction 60 of the neighboring stack 40 It can be formed in a size that can cover. In addition, the connection plate 64 on one side may be formed to have a length that can cover all of the four bonding portions 60 along the vertical direction so as to connect the entire bonding portion 60 of the stack 40.

Therefore, as shown in FIG. 6, by installing the connection plate 64 on the junction 60 according to each position to connect the junction 60, each battery cell 30 stacked on the stack 40 is electrically You can connect with it.

In addition, the device of the present embodiment may further include a front cover 70 installed on the front of the stack 40 to cover the connection plate 64 and the front of the stack 40.

A connection plate 64 is installed on the front surface of the stack 40, and a wire extending to the management circuit part of the tray is connected to various sensors such as a temperature sensor connected to the terminal of each battery cell 30 to pass. The front cover 70 is installed on the front of the stack 40 to cover and protect these wires or connection plates 64.

The front cover 70 may be formed to have a size corresponding to the lateral length of the stack 40, and may be formed to have a size capable of covering the two pairs of junctions 60 vertically. Accordingly, in this embodiment, two front covers 70 are mounted up and down for one stack 40 to cover the front of the stack 40 to block the connection plate 64 or wires from being exposed to the outside. do.

6 and 7, so that the front cover 70 can be installed on the pallet 50, a fitting part 67 protrudes in the middle of the front of the support part 54 of the pallet 50, and In the middle of the inner surface of the cover 70, a fitting groove 71 that is fitted into the fitting portion 67 is formed. Accordingly, by fitting the fitting groove portion 71 of the front cover 70 into the fitting portion 67, the front cover 70 may be detachably coupled to the stack 40.

In this embodiment, a plurality of fitting grooves 71 may be formed in the front cover 70 in the vertical direction. The spacing between the two fitting grooves 71 is the spacing between the fitting portions 67 formed on the two adjacent pallets 50 along the stacked pallet 50 or the fitting portions formed between the pallets 50 in which the joint 60 is formed. It can correspond to the spacing between (67).

Since the front cover 70 has an intermediate portion coupled to the pallet 50 in the lateral direction, both ends of the front cover 70 may be separated from the pallet 50 and flowed in the lateral direction. Accordingly, while both ends of the front cover 70 move freely, the distance between the pallet 50 and the front cover 70 can be varied. Therefore, even if the connection plate 64 or the electric wire comes out to the front side due to thermal expansion during the operation process, the front cover 70 flows, so that the blocking state of the front side of the stack 40 can be maintained.

In addition, a protrusion 72 protruding toward the pin 66 may be further formed on the inner surface of the front cover 70 at a position corresponding to the pin 66 formed on the pallet 50 for mounting the connection plate 64. . The protrusion 72 acts as a stopper that prevents the front cover 70 from being moved toward the stack 40 as it contacts the pin tip. Accordingly, the distance between the front cover 70 and the connection plate 64 is maintained, so that the front cover 70 can be prevented from contacting the connection plate 64.

In this way, the front cover of the stack 40 including the connection plate 64 is covered and protected by the front cover 70, thereby preventing the occurrence of a short circuit between the connection plates 64 or damage to various electric wires passing the front of the stack 40 You can do it.

8 shows the assembly process of the stack.

As shown in FIG. 8, the stack 40 of this embodiment prepares a battery cell 30 and a pallet 50, and holes in the positive terminal 32 and the negative terminal 34 of the battery cell 30 ( 62) is formed and processed by bending at a right angle, and the processed battery cells 30 are stacked on the pallet 50, and the pallets 50 on which the battery cells 30 are supported are sequentially stacked to form the stack 40. It can be manufactured through an electrical connection process in which the stacked pallet 50 and the stack 40 and the stack 40 are fixed, and each battery cells 30 loaded in the stack 40 are electrically connected. have.

The battery cell 30 is prepared by forming a hole 62 in the positive terminal 32 and the negative terminal 34 provided at one side and then bending it at a right angle.

The battery cells 30 are stacked on the pallet 50, and the pallet 50 is successively stacked to form a stack 40. At this time, the pallet 50 provided with the junction part and the pallet not provided with the junction part are alternately stacked. In addition, the positive terminal 32 and the negative terminal 34 of each battery cell 30 arranged above and below the pallet formed with the junction part are connected to each other at the junction part 60, respectively.

Accordingly, the positive terminal 32 and the negative terminal 34 of the battery cell 30 disposed above and below the pallet 50 with the junction 60 formed therebetween are bent toward the junction 60, respectively, so that the junction ( At 60, the positive terminal 32 and the negative terminal 34 are overlapped between adjacent battery cells 30 to be electrically connected.

A top plate 58 may be further installed on the top of the stack 40.

When all the pallets 50 are stacked and the stack 40 is completed, the stacks 40 are successively arranged along the lateral direction, and between the stacks 40 and 40 and the pallets 50 of each stack 40 ) And fix it.

When all the stacks 40 are connected, the junction 60 between the stack 40 and the stack 40 is electrically connected.

In this embodiment, a connection plate 64 may be installed between the junction 60 and the junction 60 of the stack 40 to electrically connect the adjacent stack 40. As mentioned, the connection plate 64 passes through the hole of the positive terminal 32 or the negative terminal 34 and is fastened to the fastening hole 61 of the joint 60 through the bolt 65 ) Is installed. When the connection plate 64 is fixed to the joint 60 via the bolt 65, the positive terminal 32 or the negative terminal 34 bent into the joint 60 is in close contact with the connection plate 64 Connected.

As shown in FIG. 8 through the above-described process, four stacks 40 in which eight battery cells 30 are stacked are electrically connected in series, so that they can be simply manufactured as one unit.

Accordingly, by loading a plurality of units of the stack 40 assembled as described above in the tray 20 and finally connecting them to the terminal portion 80 of the tray 20, the plurality of battery cells 30 can be electrically connected. .

9 to 11 illustrate a stacked pallet and a structure connected to and fixed between the stack and the stack according to the present embodiment.

As shown, the stack 40 of the present embodiment may further include a fixing part for fixing the stacked pallets 50 and a connection part connecting the stack 40 and the stack 40.

The fixing unit includes at least one through-hole 73 formed at the front end of the pallet 50 and a coupling bar 74 that is fitted along the through-hole 73 of the stacked pallet 50 to fix the plurality of pallets 50. Can include.

The connection portion is a pair of coupling bars 74 fitted and installed along the through holes 73 of the neighboring stacks 40 so as to connect between the stack 40 and the stack 40 that are continuously arranged in the lateral direction, It is formed integrally between the pair of coupling bars 74 may include a connection rib 75 connecting the pair of coupling bars 74.

Both the fixing part and the connection part are the same in that they are fitted in the through hole 73 formed in the pallet 50 to fix the pallet 50. However, the connection portion is installed for the through hole 73 positioned between the stack 40 and the stack 40 to further add an action to connect the stack 40. Hereinafter, portions common to the fixing portion and the connection portion will be described with the same reference numerals.

In this embodiment, the through hole 73 is a hole having a circular cross section, and is formed through the support portion 54 of the pallet 50 in the vertical direction. The through hole 73 may be formed along the center of the protrusion 56 of the support part 54. Accordingly, when the pallets 50 are stacked while the protrusions 56 of each pallet 50 are fitted into the grooves 57 of the neighboring pallets 50, the through-hole 73 along the protrusions 56 arranged in a straight line These are connected in series to form one elongated hole.

The through hole 73 may be formed along the center of the protrusion 56 and the groove 57 formed at the edge of the support part 54. Accordingly, when the stack 40 is connected, the distance between the through holes 73 formed at the corners between the stack 40 and the stack 40 is closer, so that it is easy to connect the stacks 40 using the coupling bar 74 Do.

The coupling bar 74 may be a bar-shaped structure that is elongated to fit into the through hole 73. Both the fixing portion and the coupling bar 74 of the connection portion may have the same structure. The fixing part is for fixing the stacked pallets 50 and may be composed of only one coupling bar 74. The connection part is for connecting the stack 40 and the stack 40, and two coupling bars 74 are connected by a connection rib 75 to form one body. In this embodiment, the connection rib 75 is a flat plate structure having a thickness relatively thinner than the diameter of the coupling bar 74 and may be continuously formed between the two coupling bars 74 along the axial direction.

The connection rib 75 is sufficient to have a structure connecting the two coupling bars 74, and its shape can be variously modified. For example, in addition to the above-described structure, the connecting rib may be formed by bending a structure connecting one end of the two connecting portions or an intermediate portion of the connecting bar integrally connected.

In this embodiment, a slit 76 connected to the through hole 73 is cut on the side of the support part 54 of the pallet 50. The slit serves as a passage through which the connecting rib 75 passes. The slit 76 may be formed in a straight line toward a connection direction of the stack 40, that is, a side surface of the stack 40. Accordingly, as shown in FIG. 9, when the stack 40 and the stack 40 are disposed in the lateral direction, the slits 76 formed on the pallet 50 between the adjacent stacks 40 are on the same line. It is connected in a straight line. Therefore, the connection ribs 75 connected between the coupling bars 74 do not interfere with the pallet 50 in the process of inserting the coupling bars 74 of the connection portions into the through holes 73 of the neighboring stacks 40, respectively. It can be fitted along the slit 76. As the coupling bar 74 is fitted along the through hole 73, the connection rib 75 is moved along the slit 76.

The connection ribs 75 are integrally connected to the two coupling bars 74, so that when the coupling bars 74 are inserted into the through holes 73 of the adjacent two stacks 40, the pallets of each stack 40 At the same time as 50 is fixed, the two stacks 40 are connected by the connecting ribs 75.

In this way, by inserting the coupling bar 74 connected by the connection rib 75 into the through hole 73 of the stack 40, the stack 40 and the stack 40 can be easily connected and fixed.

In the case of the stack 40 disposed on the outermost side of the continuously disposed stack 40, the coupling bar 74 of the fixing portion is inserted into the through hole 73 disposed outside. The coupling bar 74 of the fixing part is inserted into the through hole 73 of the pallet 50 stacked on the stack 40 to fix the pallet 50.

The coupling bar 74 of the fixing part may be formed of only a single coupling bar 74, or a protruding rib 77 fitted to the slit 76 of the pallet 50 may be extended on the side. The protruding rib 77 may be formed to have a length corresponding to the length of the slit 76. For example, the shape of the coupling bar 74 and the protruding rib 77 of the fixing portion may be the same as a shape obtained by cutting the middle of the connection rib 75 of the connection portion. Accordingly, when the coupling bar 74 of the fixing part is inserted along the through hole 73, the protruding rib 77 of the coupling bar 74 is fitted along the slit 76 to fill the slit.

10 shows a coupling bar for the fixing portion and the connection portion.

The coupling bar 74 of this embodiment may have a structure in which both side ends are curved to fit into the through hole 73 to form a hollow cylindrical shape, and both side ends are spaced apart from each other to face each other along the axial direction.

Accordingly, the coupling bar 74 has a cylindrical shape with an open side in the axial direction, and both ends are opened to form a hole through which the bolt 78 can be fastened.

Accordingly, the coupling bar 74 is spaced apart and the opposite side ends are gathered or widened so that the diameter may be elastically variable to some extent. Accordingly, the coupling bar 74 can be more easily inserted along the through hole 73.

In addition, as shown in FIG. 11, the coupling bar 74 may be firmly fixed by bolts 78 fastened to both ends. When the bolts 78 are fastened to the coupling bar 74, the opposite side ends of the coupling bar 74 are opened by the bolts 78 and pressurized into the through-hole 73 of the stack 40. Accordingly, the stack 40 and the coupling bar 74 may be more rigidly coupled.

The coupling bar 74 may be formed to have a length less than the total length of the through hole 73 along the vertical direction of the stack 40. Accordingly, when the coupling bar 74 is completely inserted into the through hole 73 of the stack 40, the coupling bar 74 can be prevented from protruding outside the stack 40. In addition, the bolt heads of the bolts 78 fastened to both ends of the coupling bar 74 can contact the stack 40 to press the stack 40, so that the stacked pallets 50 are in close contact with each other to be fixed. You can do it.

As mentioned, the top plate 58 is installed on the top layer of the stack 40, and the bolt 78 is fastened to the coupling bar 74 outside the top plate 58. The top plate 58 is also formed with a through hole 73 in the center of the groove 57 of the support part 54 which is a position corresponding to the through hole 73 of the pallet 50. As shown in FIG. 10, the upper plate 58 may have a stepped surface 59 formed on the upper surface so that the bolt 78 fastened to the front end of the coupling bar 74 does not protrude outside the upper plate 58.

The stepped surface 59 is formed such that the upper surface of the groove portion 57 formation portion of the support portion 54, which is a portion where the through hole 73 of the upper plate 58 is formed, is recessed below the plate 52. Accordingly, the bolt 78 fastened to the front end of the coupling bar 74 is located on the step surface 59 having a relatively low height from the upper plate 58, so that the bolt 59 is the plate 52 of the upper plate 58 It will not protrude upwards. Accordingly, even if the bolts 78 are fastened to the stack 40, it is possible to prevent the bolts from protruding out of the stack 40 and interfering with each other.

Meanwhile, the apparatus of the present embodiment may further include an insulating portion installed between the stack 40 and the stack 40 to insulate between the stacks 40. The insulating portion may have a size corresponding to the side of the stack 40 in contact with the adjacent stack 40 and may include an insulating plate 79 disposed on the side of the stack 40.

The insulating plate 79 is sufficient if it can block between the two stacks 40 by covering the side of the stack 40 as a whole, and the size of the insulating plate 79 can be variously modified.

The insulating plate 79 is a plate structure made of an insulating material and may be formed to have a thickness that can be inserted between the stack 40 and the stack 40. The insulating plate 79 can be applied to any material that can be insulated.

The insulating plate 79 blocks current from flowing between the tip of the battery cell 30 stacked on one side of the stack 40 and the tip of the battery cell 30 stacked on the adjacent stack 40. The battery cell 30 of this embodiment has a pouch shape, and has a structure that is wrapped around the outside with aluminum foil. Accordingly, as the battery cells are close between the stack and the stack, current may flow between the tip of the aluminum material having a thin thickness. In this embodiment, an insulating plate is installed between the stack and the stack to block current flowing between the battery cells.

Thus, when a plurality of stacks 40 are connected, electrical short between the stack 40 and the battery cells 30 between the stack 40 except for the electrical connection through the connection plate 64 is prevented. Can be prevented. As described above, the present apparatus is provided with the insulating plate 79 to prevent short circuits between the stacks 40, thereby preventing performance degradation and increasing the reliability of the apparatus.

12 and 13 show terminal portions according to the present embodiment.

As shown, the terminal portion 80 of this embodiment has a connection bar 81 electrically connected to the stack 40 accommodated in the tray 20, and a connection port for fixing the connection bar 81 on the front of the tray 20 ( 82), it may include a cover 83 that is detachably installed on the open front of the connection port 82 to block the exposure of the connection bar 81.

The connection port 82 has a front protrusion to protect the inner connection port 82, and is opened in the vertical direction so that the connection bar 16 electrically connecting the tray 20 and the tray 20 can pass. It is made into.

A hole 86 into which the connection bar 81 is fitted is formed in the center of the front surface of the connection port 82.

Since the cover 83 is installed on the front surface of the connection port 82, the connection bar 81 provided inside the connection port 82 is blocked without being exposed to the outside by the cover 83. Accordingly, it is possible to minimize the occurrence of damage or personal accident by being in electrical contact with the exposed connection bar 81.

For mounting the cover 83, the connector 82 has a groove 84 formed on the protruding front surface, and the cover 83 has a protrusion 85 protruding at a position corresponding to the groove 84. It may be installed in the connector 82 while the protrusion is fitted.

The connection bar 81 is a flat structure, and the inner tip is electrically connected to the stack 40 accommodated in the tray 20, and the outer tip is drawn out through the hole 86 of the connection port 82 to be connected to the connection port 82. It is fixed.

In this embodiment, the connection port 82 and the connection bar 81 have a structure that is more rigidly assembled.

To this end, the connection bar 81 is bent at a right angle through the hole 86 of the connection port 82 and fixed with bolts 89 on the front of the connection port 82, and both sides inside the hole 86 of the connection port 82 In the locking projection 87 is formed protruding, the connection bar 81 is a stepped jaw 88 is formed in a portion corresponding to the locking projection 87 in the portion passing through the hole 86 is inserted between the locking projection 87 Can be combined.

The width of the inner tip of the connection bar 81 connected to the stack 40 with respect to the step 88 is relatively larger than the width of the outer tip fixed to the connection port 82. The locking projection 87 is formed on the front side of the hole 86 of the connector 82. Accordingly, the outer tip of the connection bar 81 can be drawn out to the front of the connection port 82 through the hole 86, and the inner tip part is caught by the locking projection 87 of the hole 86 by the stepped step 88. . A hole is formed at the lower end of the bent outer tip of the connection bar 81 so that it can be fixedly installed in the connection port 82 via a bolt 89.

Therefore, the connection bar 81 fixed to the front of the connection port 82 can be fixedly installed on the connection port 82 by the locking protrusion 87 and the stepped jaw 88 even if the bolt 89 is fastened only at the lower end. have. That is, as shown in FIG. 13, the lower side of the outer tip of the connection bar 81 with respect to the connection port 82 is fixed by the bolt 89, and the upper side is the stepped jaw 88 on the locking jaw 87 It becomes a fixed state. Accordingly, it is possible to more easily and firmly combine the connection port 82 and the connection bar 81.

Although the exemplary embodiments of the present invention have been shown and described as described above, various modifications and other embodiments may be made by those skilled in the art. These modifications and other embodiments are all considered and included in the appended claims and will not depart from the true spirit and scope of the present invention.

10: housing 12: frame
14: side plate 16: connecting bar
20: tray 22: management circuit unit
24: handle 30: battery cell
32: positive terminal 34: negative terminal
40: stack 50: pallet
52: plate 54: support
55: step portion 56: protrusion
57: groove 58: top plate
59: step surface 60: joint
61: fastening hole 62: hole
64: connection plate 66: pin
67: fitting part 70: front cover
71: fitting groove 72: stone piece
73: through hole 74: coupling bar
75: connecting rib 76: slit
77: protruding rib 78: bolt
79: insulation plate 80: terminal portion
81: connection bar 82: connection port
83: cover 84: groove
85: protrusion 86: hole
87: locking piece 88: stepped

Claims (11)

A stack in which a plurality of battery cells are stacked and electrically connected, a tray in which the plurality of stacks are accommodated and electrically connected, and a terminal portion connected to the stack is installed on one side, a housing in which the plurality of trays are accommodated, and a terminal portion between the trays are electrically connected. Including a connecting bar to connect to,
The stack is a pallet supporting and supporting the battery cells and stacked together in a vertical direction to form a battery cell accommodation space therebetween, and for electrically connecting the positive and negative terminals of each battery cell accommodated in the pallet. Including an electrical connection,
The stack further includes a fixing part for fixing the stacked pallets, and a connection part connecting the stack and the stack,
The pallet includes a plate on which a battery cell is placed and supported, a support part formed integrally at both ends of the plate and protruding upward and downward to contact a neighboring pallet and maintain a gap between the plate and the plate, and both sides of the support part. It is formed and includes at least one or more protrusions and grooves coupled to the adjacent pallet,
The plurality of pallets constituting the stack are all stacked continuously with the same structure, and the support portions of the pallets adjacent to each other contact each other to form a space between the plates of the neighboring pallets, and the space between the neighboring plates and the plates It is a structure in which battery cells are stacked in the stack, and battery cells are stacked up and down with only a plurality of pallets stacked up and down.
The protrusion and the groove are formed opposite to each other on the upper and lower surfaces of the support at the same position of the support, so that the pallet and the pallet are coupled while the protrusion and the groove are fitted between the support parts of neighboring pallets
The fixing unit includes at least one through hole formed at a tip of the pallet, and a coupling bar fitted along the through hole of the stacked pallet to fix the plurality of pallets,
The through hole is formed along the protrusion center of the support part,
The through hole has a circular cross-sectional shape,
Both side ends of the coupling bar are curved so as to be inserted into the through hole to form a hollow cylindrical shape, and both side ends are spaced apart from each other and face each other along the axial direction, forming a cylindrical shape with an open side end, and both ends Is opened to form a hole into which the bolt can be fastened,
The coupling bar has a structure that is pressed and closely contacted within the through hole while opening between opposite side ends by a bolt fastened through a hole at the tip,
The coupling bar has a protruding rib extending along the axial direction on the side surface, and the pallet has a slit connected to the through hole cut at a position corresponding to the protruding rib, so that the protruding rib is fitted along the slit. Storage device. delete The method of claim 1,
The connection portion is formed integrally between a through hole formed in a pallet forming a stack, a pair of coupling bars fitted and installed respectively along through holes of a neighboring stack, and a pair of coupling bars integrally formed between the pair of coupling bars. Power storage device comprising a connecting rib to connect. delete The method of claim 1,
The electrical connection part forms a stepped part with a low height on the support part, so that the positive terminal and the negative terminal of the battery cell are drawn outward through the stepped part, and the outer surface of the support part of one pallet alternately along the stacked pallet of the stack The positive terminal and the negative terminal of the battery cell are electrically connected to each other, and the positive and negative terminals of the battery cells arranged above and below the pallet with the junction formed therebetween are respectively bent toward the junction and the A power storage device having a structure in which a positive terminal and a negative terminal are overlapped and electrically connected between adjacent battery cells at a junction, and a connecting plate is installed between the junction and the junction to electrically connect the adjacent junction. delete The method of claim 3,
The coupling bar is a power storage device formed in a length less than the length of the through hole along the vertical direction of the stack. delete delete delete The method of claim 3,
The connection rib is formed continuously along the axial direction of the coupling bar, and the pallet is formed by cutting a slit connected to the through hole at a position corresponding to the connection rib, and the connection rib is fitted along the slit. Power storage device.

Images