Battery module FPC fixing structure

Abstract

The utility model discloses a battery module FPC (Flexible Printed Circuit) fixing structure which comprises a battery module connected with an FPC busbar; fixing holes are formed in the two ends of the FPC busbar, and fixing mechanisms are connected to the peripheries of the fixing holes; the fixing mechanisms are connected in the upper, lower, left and right directions of the fixing holes, and the fixing mechanisms form a cross shape. The battery module FPC fixing structure has the beneficial effects that the battery module and the FPC busbar are connected to form the whole battery module FPC fixing structure, so that the FPC busbar is firmly fixed; glue is not needed, and a FPC mounting surface or a shell does not need to be specially designed and processed, so that the process cost is lower; the structure is simple, the conventional process can be realized and the space utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, in particular to a battery module FPC fixing structure. Background Art

[0002] Battery packs are widely used in electric vehicles, hybrid vehicles, energy storage systems and other applications that require large capacity and high voltage. As the most important component of the battery pack, the battery module accounts for most of the cost and weight of the battery pack. FPC, or flexible circuit board, has outstanding advantages in safety, lightness, and regular layout due to its high integration, ultra-thin thickness, and ultra-softness. In addition, FPC is thin, the battery pack structure is customized, and it can be directly placed on the battery pack by grabbing it with a mechanical arm during assembly. It has a high degree of automation and is suitable for large-scale mass production. There are generally three existing FPC fixing schemes: 1. Overall or partial back glue or glue dispensing. This method will cause the colloid to fail after a long time and is easy to fall off; 2. A circular positioning hole at one end and a waist-shaped hole at the other end. This method requires high waist hole size and position: too large is easy to fall off, and too small is difficult to assemble; 3. The FPC mounting surface is fixed with a limit groove. This method is limited in design space. Therefore, a battery module FPC fixing structure is needed that can be simple and effective to fix the battery module FPC for a long time.

[0003] A Chinese patent document with a publication date of February 3, 2023 and publication number CN218448506U discloses a fixing structure for an FPC connector end of a power battery module, comprising two fixed buckle plates symmetrically distributed front and back, a plastic substrate fixedly connected to the bottom end of the fixed buckle plate, an FPC assembly is plugged into one side of the top of the plastic substrate, a page plate is fixedly connected to the front and back of one side of the FPC assembly, a fixed card slot is provided inside one side of the page plate, a spring clip movable slot is provided inside one side of the fixed buckle plate, a spring clip with a hook is movably connected inside the spring clip movable slot, a spring clip receiving slot is provided at the top of one side of the fixed buckle plate, and one side of the spring clip with a hook is fixedly connected to the fixed buckle plate by a screw.

[0004] The disadvantage of the above-mentioned fixed structure of the FPC connector end of the power battery module is that the front and back sides of one side of the FPC component are connected to the page plate, a fixed slot is opened inside the page plate, a spring clip movable slot is opened inside the fixed buckle plate, a spring clip with a hook is connected inside the spring clip movable slot, a spring clip storage slot is opened on one side of the fixed buckle plate, and one side of the spring clip with a hook is connected to the fixed buckle plate. It can be seen that the overall structure of the fixed structure is very complicated and the design is highly complex. Due to the limited design space, the weight and volume will increase, and the process costs such as processing and molding will also be higher. Utility Model Content

[0005] The purpose of the utility model is to solve the problems of large occupied space, complex structure and high cost of the existing battery module FPC fixing structure, and to provide a battery module FPC fixing structure, in which a fixing mechanism and a fixing hole are arranged on the FPC bus, and the battery module and the FPC bus are fixed by using the fixing mechanism and the fixing hole, which has the advantages of simple and durable structure and low process cost.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a battery module FPC fixing structure, comprising: a battery module, the battery module is connected to an FPC bus; fixing holes are opened at both ends of the FPC bus, and a fixing mechanism is connected around the fixing holes; the fixing mechanism is connected above, below, left and right of the fixing hole, and the fixing mechanism forms a cross shape.

[0007] Using the above technical solution, the battery module is inserted into the fixing holes at both ends of the FPC bus, and the fixing mechanism fixes the fixing holes and the battery module. The fixing mechanism forms a cross shape for firm fixation. The battery module and the FPC bus are connected to form a battery module FPC fixing structure as a whole. No glue is required, and no special design and processing of the FPC mounting surface or shell is required, and little space is occupied.

[0008] Preferably, the fixing mechanism is provided with tear-proof mechanisms in four directions, namely, up, down, left, and right, of the fixing hole; the tear-proof mechanisms include copper wires. Specifically, the tear-proof mechanisms are provided corresponding to each side of the cross-shaped fixing mechanism, and a total of four are provided, which are arranged around the fixing mechanism. The tear-proof mechanisms use copper wires to prevent tearing when the fixing mechanism is under pressure, thereby improving the stability and durability of the FPC fixing structure of the pool module.

[0009] Preferably, the battery module includes a battery module upper cover and a battery module protrusion. Specifically, the battery module protrusion in the battery module is inserted into the FPC busbar for fixing, and the battery module upper cover covers one side of the FPC busbar, and the battery module protrusion is fixed by a fixing mechanism. After assembly, the battery module upper cover and the battery module protrusion are respectively located on the two sides of the FPC busbar, and the battery module and the FPC busbar together form a battery module FPC fixing structure, which is firmly fixed according to the principle of two pins on one side, and the structure is simple and durable.

[0010] Preferably, the battery module protrusions are located at both ends of the battery module upper cover, corresponding to the fixing holes of the FPC bus. Specifically, the battery module protrusions correspond to the fixing holes of the FPC bus, and when installed, the battery module protrusions are inserted into the fixing holes of the FPC bus. The battery module and the FPC bus together form a battery module FPC fixing structure, which is firmly fixed and accurately positioned according to the principle of two pins on one side, and the size and position requirements are relatively low.

[0011] Preferably, the FPC busbar is rectangular, and the battery module upper cover is rectangular; the width of the battery module upper cover is greater than the width of the FPC busbar. Specifically, the battery module upper cover and the FPC busbar are both rectangular, and after installation, the battery module upper cover is connected to one side of the FPC busbar, and the width of the battery module upper cover is greater than the width of the FPC busbar, fully covering one side of the FPC busbar, with a simple structure and easy molding.

[0012] Preferably, the battery module protrusion is a hammer-shaped protrusion formed by a cylindrical connection and a round head. Specifically, the battery module protrusion is inserted into the fixing hole of the FPC busbar during installation, wherein the round head part of the battery module protrusion passes through the fixing hole and is fixed on the side that is not in contact with the battery module upper cover, and the cylindrical part of the battery module protrusion is then clamped in the fixing hole, the whole is firmly fixed, and the size and position requirements are relatively low, and the structure is simple.

[0013] Preferably, the diameter of the fixing hole is smaller than the diameter of the round head portion of the battery module protrusion. Specifically, the fixing hole is a round hole, and the round head portion of the battery module protrusion passes through the fixing hole and is fixed to the side that is not in contact with the upper cover of the battery module. The diameter of the fixing hole is smaller than the diameter of the round head portion of the battery module protrusion, and the battery module protrusion is fixed by a fixing mechanism, so the round head portion of the battery module protrusion is not easy to fall off and slide out of the fixing hole. Not only is the structure simple and easy to form, but it is also firmly fixed and accurately positioned.

[0014] Preferably, the portion of the fixing mechanism connected to the fixing hole is movable. Specifically, the edge of the fixing mechanism is elastic and can be opened and closed, and the raised round head portion of the battery module passes through the fixing hole and is fixed to the side that is not in contact with the upper cover of the battery module. At this time, the edge of the fixing mechanism is opened to the side that is not in contact with the upper cover of the battery module, so that the raised round head portion of the battery module can pass through the fixing hole and the fixing mechanism smoothly, and then the fixing mechanism rebounds and closes again. The fixing mechanism is cross-shaped, that is, it is divided into four parts. When fewer or more fixing mechanisms are needed, the area around the fixing hole is divided into three or eight parts. In this way, assembly and disassembly are easy, and the operation can be repeated many times without being easily damaged.

[0015] Preferably, the battery module protrusion is inserted into the fixing hole, and the fixing mechanism fixes the battery module protrusion. Specifically, fixing holes of different shapes can be set corresponding to different battery module protrusions, such as rectangular and triangular fixing holes, which can correspond to rectangular and triangular battery module protrusions to meet the installation requirements of various battery modules.

[0016] The utility model provides a battery module FPC fixing structure, and the use process is as follows: align the protrusion of the battery module with the fixing hole of the FPC busbar and fix it. When the FPC busbar is fixed, the fixing hole and the fixing mechanism are a cross-shaped structure, which is stuck on the protrusion of the battery module. The fixing mechanism is elastic and has a certain amount of space for opening and closing. At the same time, the round head part of the battery module protrusion passes through the fixing hole and is fixed on the side that is not in contact with the upper cover of the battery module. The cylindrical part of the battery module protrusion is then stuck in the fixing hole, the fixing hole is fixed, and the cross opening of the fixing mechanism will also rebound and close. When disassembling, remove the FPC busbar in the opposite direction, open the cross opening of the fixing mechanism, and the FPC busbar can be removed.

[0017] The beneficial effects of the utility model are that the battery module and the FPC bus are connected to form a battery module FPC fixed structure as a whole, which firmly fixes the FPC bus; no glue is required, and no special design and processing of the FPC installation surface or shell is required, so the process cost is lower; the structure is simple, conventional processes can be implemented, and the space utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a top view of a battery module FPC fixing structure of the utility model;

[0019] Figure 2 This is a cross-sectional view of a battery module FPC fixing structure of the utility model;

[0020] Figure 3 It is a top view of a second embodiment of a battery module FPC fixing structure of the utility model;

[0021] Figure 4 This is a top view of a third embodiment of a battery module FPC fixing structure of the utility model;

[0022] In the figure: 1. Fixing mechanism; 2. Fixing hole; 3. Anti-tearing mechanism; 4. Battery module protrusion; 5. FPC bus; 6. Battery module cover. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are only for illustration and are not intended to limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those skilled in the art that these specific details do not need to be adopted to implement the present invention.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0025] Embodiment 1:

[0026] exist Figure 1 to Figure 2 In the embodiment 1 shown, the utility model provides a technical solution: a battery module FPC fixing structure, comprising: a battery module, the battery module is connected to the FPC bus 5; the FPC bus 5 has fixing holes 2 at both ends, and the fixing holes 2 are connected around the fixing holes 2. The fixing mechanism 1 is connected above, below, left and right of the fixing hole 2, and the fixing mechanism 1 forms a cross shape.

[0027] Flexible Printed Circuit (FPC) is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film as the substrate. It has the characteristics of high wiring density, light weight, thin thickness and good bending properties. FPC is thin in thickness and the battery pack structure is customized. During assembly, it can be grabbed by a robotic arm and placed directly on the battery pack. It has a high degree of automation and is suitable for large-scale mass production.

[0028] In this embodiment, Figure 1 This is a top view of a battery module FPC fixing structure of the utility model. Figure 1 As shown in , the FPC busbar 5 is rectangular, the battery module upper cover 6 is rectangular, and the battery module and the FPC busbar 5 are connected to form a battery module FPC fixed structure as a whole.

[0029] In this embodiment, Figure 1 As shown, fixing holes 2 are opened at both ends of the FPC bus 5, and a fixing hole 2 is opened at the left and right ends respectively. Fixing holes 2 of different shapes can be set corresponding to different battery module protrusions 4, such as rectangular and triangular fixing holes 2, which can correspond to rectangular and triangular battery module protrusions 4 to meet the installation requirements of various battery modules. In this embodiment, the fixing holes 2 are round holes.

[0030] In this embodiment, Figure 1 As shown, the fixing mechanism 1 is connected around the fixing hole 2; the fixing mechanism 1 is connected above, below, left and right of the fixing hole 2, and the fixing mechanism 1 forms a cross shape and is divided into four parts. When fewer or more fixing mechanisms 1 are needed, the area around the fixing hole 2 is divided into three or eight parts.

[0031] In this embodiment, Figure 1As shown, the fixing mechanism 1 is provided with anti-tear mechanisms 3 in four directions, namely, up, down, left, and right, of the fixing hole 2; the anti-tear mechanisms 3 use copper wires. The anti-tear mechanisms 3 are provided corresponding to each side of the cross-shaped fixing mechanism 1, and a total of four are provided, which are provided around the fixing mechanism 1. The anti-tear mechanisms 3 use copper wires to prevent tearing when the fixing mechanism 1 is under pressure.

[0032] In this embodiment, Figure 2 This is a cross-sectional view of a battery module FPC fixing structure of the utility model, such as Figure 2 As shown in the figure, the battery module includes a battery module cover 6 and a battery module protrusion 4. The battery module protrusion 4 in the battery module is inserted into the FPC bus 5 and fixed, and the battery module cover 6 covers one side of the FPC bus 5. The battery module protrusion 4 is fixed by the fixing mechanism 1. After assembly, the battery module cover 6 and the battery module protrusion 4 are respectively located on the two sides of the FPC bus 5. The battery module and the FPC bus 5 together constitute a battery module FPC fixing structure, which is firmly fixed according to the principle of two pins on one side.

[0033] In this embodiment, Figure 2 As shown, the width of the battery module cover 6 is greater than the width of the FPC bus 5. The battery module cover 6 and the FPC bus 5 are both rectangular. After installation, the battery module cover 6 is connected to one side of the FPC bus. The width of the battery module cover 6 is greater than the width of the FPC bus 5, and one side of the FPC bus 5 is fully covered.

[0034] In this embodiment, Figure 2 As shown, the battery module protrusions 4 are located at both ends of the battery module upper cover 6, corresponding to the fixing holes 2 of the FPC bus 5. The battery module protrusions 4 are hammer-shaped consisting of a cylinder connected to a round head. The battery module protrusions 4 are inserted into the fixing holes 2 of the FPC bus 5 during installation, wherein the round head portion of the battery module protrusions 4 passes through the fixing holes 2 and is fixed to the side that is not in contact with the battery module upper cover 6. At this time, the cylindrical portion of the battery module protrusions 4 is clamped in the fixing holes 2, and the whole is firmly fixed.

[0035] In this embodiment, Figure 2 As shown, the fixing hole 2 is a round hole, and the round head part of the battery module protrusion 4 passes through the fixing hole 2 and is fixed on the side that is not in contact with the battery module upper cover 6. The diameter of the fixing hole 2 is smaller than the diameter of the round head part of the battery module protrusion 4, and the battery module protrusion 4 is fixed by the fixing mechanism 1, so the round head part of the battery module protrusion 4 is not easy to fall off and slide out of the fixing hole 2.

[0036] In this embodiment, Figure 1 and 2As shown, the portion where the fixing mechanism 1 is connected to the fixing hole 2 is movable. The edge of the fixing mechanism 1 is elastic and can be opened and closed. The round head portion of the battery module protrusion 4 passes through the fixing hole 2 and is fixed to the side that is not in contact with the battery module upper cover 6. At this time, the edge of the fixing mechanism 1 opens toward the side that is not in contact with the battery module upper cover 6, so that the round head portion of the battery module protrusion 4 passes smoothly through the fixing hole 2 and the fixing mechanism 1, and then the fixing mechanism 1 rebounds and closes again.

[0037] The use process of a battery module FPC fixing structure in this embodiment 1 is as follows: align the protrusion of the battery module with the fixing hole 2 of the FPC bus 5 and fix it. When the FPC bus 5 is fixed, the fixing hole 2 and the fixing mechanism 1 are a cross-shaped structure, which is stuck on the battery module protrusion 4. The fixing mechanism 1 is elastic and has a certain amount of space for opening and closing. At the same time, the round head part of the battery module protrusion 4 passes through the fixing hole 2 and is fixed on the side that is not in contact with the battery module upper cover 6. The cylindrical part of the battery module protrusion 4 is then stuck in the fixing hole 2, the fixing hole 2 is fixed, and the cross opening of the fixing mechanism 1 will also rebound and close. When disassembling, remove the FPC bus 5 in the opposite direction, open the cross opening of the fixing mechanism 1, and the FPC bus can be removed.

[0038] Embodiment 2:

[0039] exist Figure 3 In the embodiment 2 shown, the utility model provides a technical solution: a battery module FPC fixing structure, comprising: a battery module, the battery module is connected to the FPC bus 5; the FPC bus 5 has fixing holes 2 at both ends, and the fixing holes 2 are connected around the fixing holes 2. The fixing mechanism 1 is connected above, below, left and right of the fixing hole 2, and the fixing mechanism 1 forms a cross shape.

[0040] exist Figure 3 In the shown embodiment 2, which is roughly the same as embodiment 1, the FPC bus 5 is rectangular, the battery module cover 6 is rectangular, and the battery module and the FPC bus 5 are connected to form a battery module FPC fixed structure as a whole. The difference is that in this embodiment 2, the fixing mechanism 1 is provided with an anti-tear mechanism 3 around the fixing hole 2. The anti-tear mechanism 3 is circular and surrounds the fixing mechanism 1. The anti-tear mechanism 3 uses copper wire. The copper wire protects the entire fixing mechanism 1 and the fixing hole 2 to prevent the fixing mechanism 1 from tearing during use. Compared with embodiment 1, the structure in this embodiment is more protective of the fixing mechanism 1 and the fixing hole 2, but the production cost required is also higher, and more investment is required in mass production. It is suitable for battery module FPC fixed structures that require stronger protection.

[0041] The use process of a battery module FPC fixing structure in this embodiment 2 is as follows: align the protrusion of the battery module with the fixing hole 2 of the FPC bus 5 and fix it. When the FPC bus 5 is fixed, the fixing hole 2 and the fixing mechanism 1 are cross-shaped structures, which are stuck on the battery module protrusion 4. The fixing mechanism 1 is elastic and has a certain amount of space for opening and closing. At the same time, the round head part of the battery module protrusion 4 passes through the fixing hole 2 and is fixed on the side that is not in contact with the battery module upper cover 6. The cylindrical part of the battery module protrusion 4 is stuck in the fixing hole 2 at this time. The fixing hole 2 is fixed, and the cross opening of the fixing mechanism 1 will also rebound and close. The anti-tearing mechanism 3 is circular, which has stronger protection for the fixing mechanism 1 and the fixing hole 2. When disassembling, remove the FPC bus 5 in the opposite direction, open the cross opening of the fixing mechanism 1, and the FPC bus can be removed.

[0042] Embodiment 3:

[0043] exist Figure 4 In the illustrated embodiment 3, the utility model provides a technical solution: a battery module FPC fixing structure, comprising: a battery module, the battery module being connected to an FPC bus 5; fixing holes 2 being opened at both ends of the FPC bus 5, and a fixing mechanism 1 being connected around the fixing holes 2; the fixing mechanism 1 being connected above, below, left and right of the fixing hole 2, and the fixing mechanism 1 forming a cross shape.

[0044] exist Figure 4 The embodiment 3 shown is substantially the same as the embodiment 1, with the difference being that, in the embodiment 3, fixing holes 2 are opened at both ends and the central part of the FPC bus 5, a fixing hole 2 is opened at each of the left and right ends, and a fixing hole 2 is opened in the middle, and correspondingly there are three groups of fixing mechanisms 1 and anti-tearing mechanisms 3, the fixing mechanism 1 is a cross-shaped structure, the anti-tearing mechanism 3 is arranged corresponding to each side of the cross-shaped fixing mechanism 1, and a total of four are arranged around the fixing mechanism 1, and the present embodiment is suitable for a battery module whose overall arrangement is a group of three battery protrusions, and the three groups of fixing holes 2, the fixing mechanism 1 and the anti-tearing mechanism 3 can still ensure that the overall FPC fixing structure of the battery module is firmly fixed and accurately positioned.

[0045] The use process of a battery module FPC fixing structure in this embodiment 3 is as follows: there are three groups of fixing holes 2, so the corresponding battery module has three battery protrusions. The three battery protrusions of the battery module are aligned with the three groups of fixing holes 2 of the FPC bus 5 for fixing. When the FPC bus 5 is fixed, the fixing holes 2 and the fixing mechanism 1 are cross-shaped structures, which are stuck on the battery module protrusion 4. The fixing mechanism 1 is elastic and has a certain amount of space for opening and closing. At the same time, the round head part of the battery module protrusion 4 passes through the fixing hole 2 and is fixed on the side that is not in contact with the battery module upper cover 6. The cylindrical part of the battery module protrusion 4 is stuck in the fixing hole 2 at this time. The fixing hole 2 is fixed, and the cross opening of the fixing mechanism 1 will also rebound and close. The anti-tearing mechanism 3 is circular, which has stronger protection for the fixing mechanism 1 and the fixing hole 2. When disassembling, remove the FPC bus 5 in the opposite direction, open the cross opening of the fixing mechanism 1, and the FPC bus can be removed.

[0046] The beneficial effects of the utility model are that the entire FPC bus and the upper cover of the battery module do not require backing glue or dispensing glue: there is no need to add backing glue or dispensing glue equipment, which saves space and reduces costs; there is no need to use glue, and there is no need to consider the solidification time of the colloid, which reduces the production cycle to a certain extent; in addition, there is no need to conduct design evaluation on faults such as colloid aging and failure; the fixing structure of the entire FPC bus is consistent, and the size and position requirements are relatively low: the structure is simple, and the FPC production tooling is reduced, which has certain advantages in production and cost; the upper shell of the battery module only needs no less than two protrusions: the structure is simple and easy to form; it is easy to assemble and disassemble, and can be operated in multiple cycles without being easily damaged; according to the principle of two pins on one side, it is firmly fixed and accurately positioned.

[0047] Although the terms such as fixing mechanism, fixing hole, tear-proof mechanism and battery module are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A battery module FPC fixing structure, characterized in that: include: A battery module, wherein the battery module is connected to an FPC bus (5); The FPC busbar (5) has fixing holes (2) at both ends, and the fixing holes (2) are connected to the fixing mechanism (1) around them; The fixing mechanism (1) is connected to the fixing hole (2) in the upper, lower, left and right directions, and the fixing mechanism (1) forms a cross shape.

2. The FPC fixing structure according to claim 1, characterized in that: The fixing structure is provided with anti-tearing mechanisms (3) in four directions, namely, up, down, left, and right, of the fixing hole (2); The anti-tear mechanism (3) comprises copper wire.

3. The FPC fixing structure according to claim 1, characterized in that: The battery module comprises a battery module upper cover (6) and a battery module protrusion (4).

4. The FPC fixing structure according to claim 3, characterized in that: The battery module protrusions (4) are located at two ends of the battery module upper cover (6) and correspond to the fixing holes (2) of the FPC busbar (5).

5. The FPC fixing structure according to claim 1, characterized in that: The FPC busbar (5) is rectangular, and the battery module upper cover (6) is rectangular; The width of the battery module upper cover (6) is greater than the width of the FPC busbar (5).

6. The FPC fixing structure according to claim 3 or 4, characterized in that: The battery module protrusion (4) is in the shape of a hammer formed by connecting a cylinder with a round head.

7. The FPC fixing structure according to claim 1 or 2, characterized in that: The diameter of the fixing hole (2) is smaller than the diameter of the round head portion of the battery module protrusion (4).

8. The FPC fixing structure according to claim 1 or 2, characterized in that: The portion of the fixing mechanism (1) that is connected to the fixing hole (2) is movable.

9. The FPC fixing structure according to claim 6, characterized in that: The battery module protrusion (4) is inserted into the fixing hole (2), and the fixing mechanism (1) fixes the battery module protrusion (4).

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