Modular battery packs for energy storage systems

Abstract

A component-type battery pack for ESS, especially ESS used in a home, is provided. The battery pack according to the present disclosure includes: a housing, two or more battery cells, and a system, the system including a box and a lead part jig, the battery cells are received in the box, wherein the box is configured to be opened and closed to enable attachment / detachment of the battery cells, and the lead part jig is configured to be mounted on / detached from the leads of the battery cells, so that when the battery cells are placed in the box and stacked in the thickness direction and the lead part jig is mounted on the leads of the battery cells, electrical connection is established between the battery cells without welding the leads of the battery cells.

Description

Technical Field

[0001] The present disclosure relates to a battery pack, and more particularly, to a battery pack for an energy storage system (EES). This application claims the benefit of Korean Patent Application No. 10-2020-0071146 filed on June 11, 2020 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0002] As a substitute for fossil energy, lithium secondary batteries that can be repeatedly recharged have attracted attention. Lithium secondary batteries have been mainly used in traditional handheld devices such as mobile phones, cameras and power tools. Recently, there is a growing trend in the application range of lithium secondary batteries in electric vehicles (EV, HEV, PHEV), uninterruptible power supply systems (UPS) and energy storage systems (ESSs). For lithium secondary batteries that provide high voltage and high current, battery modules or battery packs are used, in which multiple battery cells themselves are stacked, or multiple battery cells installed in a box are stacked to form a dense structure, and the multiple battery cells are electrically connected to each other.

[0003] ESS refers to a system that is supplied with external power from an external power source (e.g., a power plant), stores the external power, and transmits the power to a desired location when necessary. In combination with a smart grid, power from renewable energy sources such as solar power and wind power can be stored, and power can be supplied from an external power source and stored at lower times when power prices are lower, and the stored power can be supplied when power consumption is high, thereby contributing to efficient power management from the standpoint of power providers and contributing to low power costs from the standpoint of customers.

[0004] There has been a trend toward higher capacity for ESS, but recently, with the spread of home automation, there has been increasing interest in small-scale ESS for homes to prevent power outages in the event of a power outage, or for emergency power in areas where power supply fluctuates. Additionally, in order to achieve efficient energy use, demand for home ESS is growing as government support for solar-powered homes continues to increase.

[0005] The battery pack required for home ESS can be manufactured by stacking a plurality of battery cells to form a dense structure and electrically connecting the plurality of battery cells. Since the electrical connection is established by welding the leads of the battery cells, the battery module or battery pack in the form of a welded product is provided to the customer. Problems may occur during the use of the battery pack, and the most common problem is the deformation of the battery module caused by the expansion of a specific battery cell and the voltage drop of a specific battery cell, and these problems are problems that occur in a specific battery cell, not problems that occur on the entire battery module.

[0006] Since the battery module assembled by welding cannot be disassembled into battery cells, only a specific battery cell cannot be replaced. Therefore, even when a problem occurs in a specific battery cell, the entire battery module or battery pack needs to be replaced. Summary of the invention

[0007] Technical issues

[0008] The present disclosure aims to provide a battery pack for a home energy storage system (ESS), which is very easy to separate and install battery cells, so that consumers can replace the battery cells themselves.

[0009] The technical problems of the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

[0010] Technical Solution

[0011] In order to solve the above problems, a battery pack according to the present disclosure includes a housing, at least two battery cells, and a system, the system including a box and a lead jig, the battery cells are received in the box, wherein the box is configured to be opened and closed to attach / detach the battery cells, and the lead jig is configured to be mounted on / detached from the leads of the battery cells, and when the battery cells are received in the box, stacked in the thickness direction and the lead jig is mounted on the leads of the battery cells, an electrical connection is established between the battery cells without welding the leads of the battery cells.

[0012] In the present disclosure, the battery cell may be a pouch-type secondary battery in a flat shape including a laminate film for hermetic sealing and leads extending in two directions.

[0013] In this case, the lead jig may be provided in the two directions in which the leads of the battery cells extend.

[0014] In the present disclosure, the housing may include a case configured to receive the battery cells to stack the battery cells in a thickness direction, and the case has an opening formed in at least one end.

[0015] In the present disclosure, the cartridge may be press-fit into the housing.

[0016] In the present disclosure, the case may include: a pair of frames supporting edges of the battery cells while exposing leads of the battery cells; and snaps provided on opposite sides between the pair of frames.

[0017] In the present disclosure, the lead jig may include: a pair of conductive plates, between which the leads of the battery cell are inserted; and an adjusting member connected to: reduce the distance between the pair of conductive plates so that the conductive plates compress the leads, or increase the distance between the conductive plates to separate the conductive plates from the leads.

[0018] In this case, the adjustment member may be a lever member that operates by movement of one of the pair of conductive plates toward and away from the lead wire.

[0019] In the present disclosure, the lead jig may further include a connecting bar that connects the lead of any one battery cell in series to the lead of an adjacent battery cell in a thickness direction.

[0020] Beneficial Effects

[0021] According to the present disclosure, since the box for receiving the battery cell and the structure for connection between the leads can be assembled / disassembled or attached / detached, the battery cell of the battery pack for a home energy storage system (ESS) can be easily separated and installed by installing / removing the jig and the box. Therefore, when a problem occurs in a specific battery cell, the burden of replacing the specific battery cell can be reduced, and there is no need to replace the entire battery module or battery pack due to the problem of the specific battery cell.

[0022] According to the present disclosure, it is not necessary to weld the leads of the battery cells in advance, that is, before providing to customers, thereby achieving cost savings. It is possible to reduce damage to the housing that may occur during the delivery of the finished product. Since the battery cells, housing and system can be delivered separately, flexibility in product supply can be achieved.

[0023] According to the present disclosure, from the perspective of customers, it is possible to provide convenience in battery cell replacement and save maintenance costs including after-sales service costs, and from the perspective of manufacturers, it is possible to achieve reduced manufacturing costs and improved efficiency due to flexibility in product supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a block diagram conceptually illustrating a battery pack according to an embodiment of the present disclosure.

[0025] Figure 2 It is shown Figure 1 Schematic diagram of the simplest example of a battery pack.

[0026] Figure 3 is a view showing the structure of a battery cell that may be included in the battery pack of the present disclosure.

[0027] Figure 4 is an exploded cross-sectional view of a cartridge that may be included in a battery pack of the present disclosure.

[0028] Figure 5 This is a perspective view of the assembly of the case and the battery cell.

[0029] Figure 6 An example of a housing that may be included in the battery pack of the present disclosure is shown.

[0030] Figure 7 is a schematic diagram of a lead fixture that may be included in the battery pack of the present disclosure.

[0031] Figure 8 and Fig. 9 is a side view illustrating a method of using an embodiment of a lead jig.

[0032] Fig.10 and Fig.11 is a perspective view showing a method of using an embodiment of a lead jig.

[0033] Fig.12 and Fig.13 is a perspective view showing an embodiment of a lead jig for connecting a battery cell and releasing the connection.

[0034] Fig.14 The present invention is a perspective view of connecting leads of a battery cell using an embodiment of a lead fixture. DETAILED DESCRIPTION

[0035] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the present disclosure is not limited to the disclosed embodiments, and may be implemented in various different forms, and these embodiments are provided so that the present disclosure will be comprehensive and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Therefore, the embodiments described herein and the illustrations shown in the accompanying drawings are only the most preferred embodiments of the present disclosure, and are not intended to fully describe the technical aspects of the present disclosure, so it should be understood that various other equivalents and modifications may have been made to it when the application is submitted.

[0036] The present disclosure manufactures an assembled battery pack. The term "assembled" refers to a structure in which individual parts can be assembled and disassembled according to the purpose. The present disclosure proposes to provide customers with each of the housing, system, and battery cells (i.e., each modular component) that is disassembled rather than welded together like a traditional battery module or battery pack, and assemble them at the destination.

[0037] Since no welding is performed before delivery to customers, it is designed for attaching / detaching battery cells of a battery module received in a housing.

[0038] Figure 1 is a block diagram conceptually illustrating a battery pack according to an embodiment of the present disclosure. Additionally, Figure 2 It is shown Figure 1 Schematic diagram of the simplest example of a battery pack.

[0039] The battery pack 100 according to the present disclosure is a modular battery pack and includes a housing 10, at least two battery cells 20, and a system 50. The system 50 includes a box 30 and a lead fixture 40, and the battery cells 20 are received in the box 30. All components may have an anti-electric shock function. Figure 1 As shown, each component is separately provided to a customer and may be assembled into the battery pack 100 at a destination.

[0040] like Figure 2 As shown, the system 50 can be installed in the housing 10. Figure 2 As shown, the system 50 and the battery cell 20 installed in the housing 10 can be provided to the customer separately, and the customer only needs to combine the battery cell 20 with the box 30 and the lead jig 40 at the destination. That is, since the system 50 has been completed, in order to use it, it is only necessary to combine the battery cell 20 with the box 30 and the lead jig 40.

[0041] The case 30 is for receiving the battery cells 20 therein and stacking them in the thickness direction within the housing 10. The case 30 is configured to be opened and closed to attach / detach the battery cells 20.

[0042] The lead jig 40 is configured to be mounted on / detached from the leads of the battery cells 20. When the battery cells 20 are received in the case 30 and the lead jig 40 is mounted on the leads of the battery cells 20, electrical connections are established between the battery cells 20 without welding the leads of the battery cells 20.

[0043] When the housing 10 with the system 50 mounted thereon is provided to a customer, the customer places the battery cells 20 in the box 30 and in the lead jig 40. When the housing 10 and the system 50 are provided to a customer separately, the customer may install the system 50 in the housing 10, place the battery cells 20 in the box 30, and place them in the lead jig 40. Alternatively, the customer may place the battery cells 20 in the box 30 and stack them, then place them in the lead jig 40, and place the battery cells 20 and the system 50 in the housing 10.

[0044] Figure 3 2 is a view showing a structure of a battery cell 20 that may be included in the battery pack of the present disclosure. The battery cell 20 may be a flat-shaped pouch-type secondary battery including a laminate film 22 for airtight sealing and leads 24 extending in two directions.

[0045] The pouch-type secondary battery may include an electrolyte solution and an electrode assembly in the laminate film 22. Here, the electrode assembly may include at least one positive electrode plate and at least one negative electrode plate, wherein a separator is disposed between the at least one positive electrode plate and the at least one negative electrode plate. More specifically, the electrode assembly may be divided into a roll-type electrode assembly in which one positive electrode plate and one negative electrode plate are wound together with a separator, and a stacked-type electrode assembly in which a plurality of positive electrode plates and a plurality of negative electrode plates are stacked in an alternating manner with a separator disposed therebetween.

[0046] Additionally, the laminate film 22 may include an outer insulating layer, a metal layer, and an inner adhesive layer. The laminate film 22 may receive an electrode assembly therein. In particular, in the example shown, the electrode assembly is placed between two laminate films 22, and a sealing area S is formed by welding along the periphery of the electrode assembly, and the inner adhesive layers of the laminate film 22 are in contact with each other to seal the internal space receiving the electrode assembly. In this case, the lead 24 connected to the electrode assembly may extend to the left and right from the battery cell 20. The portion of the sealing area S from which the lead 24 extends may be folded in a wing shape, for example, in the thickness direction of the battery cell 20, and completed with a tape 26.

[0047] Here, when the thickness direction of the battery cell 20 is referred to as the Z-axis direction, the battery cell 20 has a flat shape so that the surface perpendicular to the Z-axis direction has the widest area. When the direction in which the lead 24 extends from the battery cell 20 is referred to as the X-axis direction, it is understood that the sealing area S placed in the Y-axis direction perpendicular to the X-axis direction is folded in a wing shape. One lead 24 is positive and the other lead 24 is negative. In this embodiment, the battery cell 20 is formed into a rectangular shape having two long sides and two short sides along the periphery, the two short sides are placed in the X-axis direction in a manner perpendicular to the X-axis, and the lead 24 extends to form a platform portion. The two long sides are placed in the Y-axis direction in a manner perpendicular to the Y-axis.

[0048] The above-mentioned pouch type secondary battery is obvious to those skilled in the art, and a detailed description thereof is omitted here. In addition to the above-mentioned battery cell 20 , the battery pack 100 according to the present disclosure may include various types of battery cells known at the time of filing a patent application.

[0049] Figure 4 is an exploded cross-sectional view of a cartridge that may be included in a battery pack of the present disclosure. Figure 5 This is a perspective view of the assembly of the case and the battery cell.

[0050] refer to Figure 4 and Figure 5 When the battery cells 20 are received in the box 30 and stacked in the thickness direction, the box 30 holds the battery cells 20 to prevent the battery cells 20 from moving. The box 30 is configured to be opened and closed to attach / detach the battery cells 20. Specifically, the box 30 includes a pair of frames 32a, 32b to support the edges of the battery cells 20 while exposing the leads 24 of the battery cells 20, and snaps 34 may be formed on opposite sides between the pair of frames 32a, 32b.

[0051] More specifically, when engaged, the pair of frames 32a, 32b may be approximately symmetrical and may be rectangular ring-shaped frames with a hollow center. The four edges of the pair of frames 32a, 32b are disposed on the periphery of the battery cell 20, and the battery cell 20 may be received in the inner space of the pair of frames 32a, 32b. In order to protect the battery cell 20 received in the box 30 and improve heat dissipation, a heat sink 33 may also be included on the inner side of the pair of frames 32a, 32b.

[0052] The key point is that the box 30 is configured to be opened and closed to attach / detach the battery cell 20. When the battery cell 20 is received between the pair of frames 32a, 32b and the snaps 34 formed on the opposite sides engage with each other, the box 30 can stably support the battery cell 20. When the snaps 34 are disengaged, the pair of frames 32a, 32b can be separated and the battery cell 20 can be removed from the frames. As an alternative to using the snaps 34, a hook coupling structure can be formed by engaging / disengaging a hook attached to one frame with a hook stopper formed in the other frame. The box 30 and the battery cell 20 can be assembled / disassembled to maximize user convenience.

[0053] The housing 10 is configured to receive and store the battery cell 20 therein to protect the battery cell 20. Additionally, the housing 10 forms the shape of the entire battery pack 100. The housing 10 may have a receiving space for receiving the battery cell 20 received in the box 30. The interior and exterior of the housing 10 require insulation and flame retardant functions, and the housing 10 may have various types and shapes. Since the space for installation in a home is limited, it is necessary to make the housing 10 and the entire system compact.

[0054] Figure 6 An example of the housing 10 that may be included in the battery pack 100 of the present disclosure is shown.

[0055] For example, the housing 10 may include a shell 12, in which the battery cells 20 are received to be stacked in the thickness direction, and the shell 12 has an opening O formed in at least one end. The opening O may be formed at various positions, such as the top, bottom or side of the shell 12. After all the battery cells 20 are received in the shell 12, the opening O may be closed by a cover 14. The cover 14 is opened and closed. Although this embodiment shows that the opening O is provided on the side of the shell 12 and is covered by the cover 14 to form an approximately rectangular box shape, the present disclosure is not limited to the shape of the housing 10.

[0056] The box 30 may be press-fitted into the housing 10. To this end, the housing 12 may further include an auxiliary structure for receiving the box 30, such as a groove structure that allows the box 30 to be slidably inserted through the opening O of the box 30, or a protrusion such as a shelf on which each box 30 is placed. With the auxiliary structure, each individual box 30 can be pushed into place and received in the housing 10, and the battery cell 20 can be supported more stably. The battery pack 100 including the housing 10 can be manufactured to hold the battery cell 20 received in the box 30.

[0057] In this embodiment, the housing 12 itself can be assembled. The housing 12 may include: a top plate 12a, which covers the top of the battery cell 20 received in the uppermost box 30 in the Z-axis direction; a bottom plate 12b, which is placed opposite to the top plate 12a to cover the bottom of the battery cell 20 received in the lowermost box 30; and a pair of side plates 12c, which are connected to the top plate 12a and the bottom plate 12b and are placed outside the short sides of the battery cell 20. When assembled, a rectangular tubular shape with two open sides in the Y-axis direction can be formed. The housing 12 may also include a rear plate 12d, which is vertically connected to the top plate 12a, the bottom plate 12b and the side plate 12c to close one of the open sides. When the opening O is formed in the Y-axis direction and placed facing the user, the cover 14 becomes a front cover covering the front side of the housing 12. The battery pack 100 for use in a home ESS may be formed into a wall-mounted shape to obtain user convenience and space utilization, and may be mounted on a wall or a pillar indoors or outdoors. In this case, generally speaking, a bracket for wall mounting may be added according to the nature of the corresponding product. Therefore, the housing 10 may be fixed using an added bracket or a support such as a shelf, with the rear plate 12d placed facing the wall.

[0058] When the battery pack 100 needs maintenance and repair, the user can remove the cover 14 provided on the front side to intuitively see the interior of the housing 12. The box 30 or the battery cell 20 can be inserted or removed through the opening O. Of course, any other examples of the housing 10 are also possible.

[0059] Here, the top plate 12a, the bottom plate 12b, the side plate 12c and the back plate 12d may be connected to each other in contact by a combination or a bolt connection or using a hinge structure. Alternatively, any one of the above-mentioned plates may have a press-fit protrusion, and the other may have a press-fit groove, and the top plate 12a, the bottom plate 12b, the side plate 12c and the back plate 12d may be assembled by press-fitting. In this case, each of the press-fit groove and the press-fit protrusion may be continuously formed along the vertical edges of the top plate 12a, the bottom plate 12b, the side plate 12c and the back plate 12d.

[0060] A fixing member may be included between the cover 14 and the housing 12 to fix the cover 14 to the housing 12 .

[0061] Figure 7 is a schematic diagram of a lead jig 40 that may be included in the battery pack 100 of the present disclosure.

[0062] The lead jig 40 is configured to be mounted on / detached from the lead 24 of the battery cell 20. Specifically, the lead jig 40 may include a pair of conductive plates 41a, 41b and an adjusting member 43. Since the battery cell 20 has a bidirectional lead 24, the lead jig 40 may be disposed in both directions in which the lead 24 of the battery cell 20 extends. For each battery cell 20, a unit including a pair of conductive plates 41a, 41b and an adjusting member 43 may be disposed to correspond to the lead 24 of the battery cell 20. The housing 10 may further include an auxiliary structure to simply receive the unit, fix it after receiving it, or install it earlier than the box 30.

[0063] The lead 24 of the battery cell 20 may be inserted between the pair of conductive plates 41a, 41b. The pair of conductive plates 41a, 41b are provided with an area similar to or larger than that of the lead 24. The pair of conductive plates 41a, 41b further include holes, through which connecting members such as fasteners or screws are further provided to allow the pair of conductive plates 41a, 41b to move in the Z-axis direction and prevent the pair of conductive plates 41a, 41b from sliding or moving in the X-axis direction or the Y-axis direction.

[0064] The adjusting member 43 is connected to the pair of conductive plates 41a, 41b to adjust the distance between the pair of conductive plates 41a, 41b, particularly in the Z-axis direction. The adjusting member 43 can reduce the distance between the conductive plates 41a, 41b to compress the lead 24 inserted between the pair of conductive plates 41a, 41b. Additionally, the adjusting member 43 can increase the distance between the conductive plates 41a, 41b to separate the conductive plates 41a, 41b from the lead 24. The distance between the pair of conductive plates 41a, 41b can be adjusted by allowing one or both of the conductive plates 41a, 41b to move in the Z-axis direction.

[0065] The system 50 is configured to establish an electrical connection between the battery cells 20 without welding the leads 24 of the battery cells 20 when the battery cells 20 are received in the box 30, stacked in the thickness direction, and the lead jig 40 is mounted on the leads 24 of the battery cells 20. For the electrical connection between the battery cells 20, it is necessary to include wiring between the lead jigs 40 connected to different battery cells 20. In particular, the lead jig 40 may further include a connecting rod 44 to connect the lead 24 of any one battery cell 20 in series to the lead 24 of another adjacent battery cell 20 in the thickness direction, i.e., the Z-axis direction. Therefore, a series connection can be established by connecting two leads 24 on one side of the battery cell 20 stacked one above the other in the thickness direction without a component such as a bus bar.

[0066] When assembling the battery pack 10, the battery cells 20 may be received in the case 30 and stacked in the thickness direction, and the lead jig 40 may be installed on the leads 24 of the battery cells 20 to complete the battery module, and then received in the housing 10. In another example, the lead jig 40 may be installed in the housing 10, the case 30 may be stacked in the housing 10, and at the same time, the leads 24 may be pressed by the lead jig 40. In yet another example, the lead jig 40 may be installed in the housing 10, and whenever the case 30 is received in the housing 10, the leads 24 may be pressed by the lead jig 40.

[0067] Additionally, the housing 10 may further include an auxiliary structure to simply receive the lead jig 40, fix it after receiving it, or install it earlier than the box 30. Most preferably, the lead jig 40 can be installed in the housing 10, and the box 30 can be inserted into the housing 12 along the Y-axis direction like placing books on a bookshelf and assembled along the Z-axis direction, or conversely, the boxes 30 can be removed and separated one by one.

[0068] Figures 8 to 11 4 is a view illustrating an embodiment of the lead jig 40 in detail, and in particular, Figure 8 and Fig. 9 is a side view showing the method of use, Fig.10 and Fig.11 3 is a perspective view showing the method of use. Although the battery cell 20 is received in the box 30 and connected to the lead fixture 40, for the purpose of illustration, Figures 8 to 11 An example of connecting the battery cells 20 is shown.

[0069] The adjusting member 43 of the lead wire jig 40 is a lever member 45. The lever member 45 operates by moving one of the pair of conductive plates 41a, 41b (ie, the upper conductive plate 41a) toward and away from the lead wire 24.

[0070] Figure 8 is a side view showing the use of the lever member 45 to connect the lead 24 of the battery cell 20, Fig. 9 4 is a side view showing the use of the lever member 45 to release the connection of the lead 24 of the battery cell 20 .

[0071] Fig.10 is a perspective view showing the use of a lever member 45 to connect the lead wire 24 of the battery cell 20, Fig.11 4 is a perspective view showing the use of the lever member 45 to release the connection of the lead 24 of the battery cell 20 .

[0072] That is, the lever member 45 includes a driver 46 for driving the upper conductive plate 41a to move vertically and a lever 47 for vertically manipulating the driver 46. When the lever 47 descends, the driver 46 descends, and the upper conductive plate 41a connected to the driver 46 moves closer to the lead 24. When the lever 47 rises, the driver 46 rises, and the upper conductive plate 41a connected to the driver 46 moves away from the lead 24.

[0073] Fig.12 and Fig.13 is a perspective view showing an embodiment of a lead jig for connecting a battery cell and releasing the connection.

[0074] Fig.12 is a perspective view showing the use of a lever member 45 to connect the leads of a battery cell, Fig.13 4 is a perspective view showing the use of a lever member 45 to release the connection of the lead of the battery cell. The pair of conductive plates 41a, 41b further include holes 48 to which screws 49 are added. Fig.12 In the embodiment, the lever 47 is located at the lower position, the driver 46 is located at the lower position, and the upper conductive plate 41a connected to the driver 46 is in close contact with the lower conductive plate 41b. Fig.13 , the lever 47 is located at an upper position, the driver 46 is located at an upper position, and the upper conductive plate 41a connected to the driver 46 is spaced apart from the lower conductive plate 41b. Fig.12 The situation without the screw 49 is shown, Fig.13 The situation in which the screw 49 is present is shown.

[0075] Fig.141 is a perspective view of connecting the leads of a battery cell using an embodiment of a lead fixture. As shown in the figure, in actual use, the battery cell 20 is received in a box 30 and connected to the corresponding box 30.

[0076] In the case where the battery cell 20 is received in the housing 10 and assembled, when the two leads 24 of the corresponding battery cell 20 are inserted between each conductive plate 41a, 41b provided outside the lead 24, and the conductive plates 41a, 41b are contacted with each other using the lever members 45 on both sides, the lead 24 is squeezed to establish an electrical connection. In the case where any battery cell 20 has a problem when in use, when replacing the corresponding battery cell 20, the lead 24 can be removed simply by separating the conductive plates 41a, 41b using the lever member 45, which adjusts the conductive plates 41a, 41b that squeeze the lead 24 of the corresponding battery cell 20, and the battery cell 20 can be removed from the housing 10 by removing the other lead 24 in the same manner, so maintenance and repair can be performed, and the work is very simple. Therefore, in the connection of the battery cell 20, the workability is good, and the maintenance and repair performance is excellent.

[0077] Since the battery pack 100 of the present disclosure includes the complete system 50 separated from the housing 10 , in order to use it, it is only necessary to combine the battery cell 20 with the case 30 and the lead jig 40 .

[0078] The battery pack 100 can be used as a battery pack for a home ESS system. Since the box 30 receiving the battery cell 20 and the parts for connection between the leads 24 are assembled / disassembled or attached / detached, the battery cell 20 can be separated and installed in a simple manner by installing / removing the lead jig 40 and the box 30. Therefore, when a problem occurs in a specific battery cell, the workload can be reduced, and the need to replace the entire module or battery is eliminated. Therefore, since the customer only needs to replace the specific battery cell that has a problem, the after-sales service cost can be reduced, thereby reducing the maintenance cost.

[0079] Additionally, there is no need to weld the leads of the battery cell 20 before providing it to the customer, thereby saving costs. It is possible to reduce damage to the housing that may occur during transportation of the finished product. Since the battery cell, housing, and system can be delivered separately, flexibility in product supply can be achieved, thereby improving efficiency.

[0080] The terms indicating directions used herein, such as up, down, left, right, front, and rear, are used only for convenience of description, and it is obvious to those skilled in the art that the terms may vary depending on the position of the elements being described or the observer.

[0081] Although the present disclosure has been described above with reference to a limited number of embodiments and drawings, the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto within the technical aspects of the present disclosure and the equivalent scope of the appended claims.

Claims

1. A battery pack comprising: shell; At least two battery cells; as well as A system comprising a box and a lead fixture, wherein the battery cell is received in the box, wherein the box is configured to be opened and closed to attach / detach the battery cell, and the lead jig is configured to be mounted on / detached from the lead of the battery cell, and When the battery cells are received in the case, stacked in the thickness direction and the lead jig is mounted on the leads of the battery cells, electrical connection is established between the battery cells without welding the leads of the battery cells, Wherein, the lead fixture comprises: an upper conductive plate and a lower conductive plate, the lead wires of the battery cells being inserted between the upper conductive plate and the lower conductive plate; and a lever member, the lever member comprising a driver for driving the upper conductive plate to move vertically and a lever for vertically manipulating the driver, wherein when the lever descends, the driver descends, and the upper conductive plate connected to the driver moves close to the lead, and when the lever ascends, the driver ascends, and the upper conductive plate connected to the driver moves away from the lead, Wherein, when the upper conductive plate and the lower conductive plate are brought into contact with each other using the lever member, the lead wire is compressed to establish an electrical connection.

2. The battery pack according to claim 1, wherein: The battery cell is a pouch-type secondary battery in a flat shape, which includes a laminate film for airtight sealing and the leads extending in two directions.

3. The battery pack according to claim 2, wherein: The lead jig is disposed in the two directions in which the lead of the battery cell extends.

4. The battery pack according to claim 1, wherein: The housing includes a case configured to receive the battery cells to stack the battery cells in the thickness direction, and the case has an opening formed in at least one end.

5. The battery pack according to claim 1, wherein: The cartridge is press-fit into the housing.

6. The battery pack according to claim 1, wherein: The box includes: a pair of frames supporting edges of the battery cells while exposing the leads of the battery cells; and Snap buttons are provided on opposing sides between the pair of frames.

7. The battery pack according to claim 1, wherein: The lead jig further includes a connecting rod that connects the lead of any one battery cell in series to the lead of an adjacent battery cell in the thickness direction.

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