KR102450449B1 - Battery module with sliding and jam-fastening strap - Google Patents

Abstract

Disclosed is a battery module having a hooked and fastened strap. The battery module having a hooked and fastened strap according to the present invention is a battery module including a protective frame accommodating a battery unit comprised of a plurality of battery cells which are laminated, wherein the protective frame includes: first and second lateral covers supporting both side surfaces of the battery unit; front and rear covers having a plurality of bus bars mounted thereon to be connected to a lead tab of the battery cell, and joined to the first and second lateral covers to support the front surface and the rear surface of the battery unit; upper and lower covers disposed to support a top surface and a bottom surface of the battery unit, respectively; and a strap hooked and fastened to the upper cover through a sliding assembly into the upper cover, and joined to the first and second lateral covers to prevent the upper cover from leaving. According to the present invention, the strap conveniently hooked and fastened to the upper cover through the sliding assembly without separate working tools or equipment is firmly fastened to the first and second lateral covers to prevent the upper cover from leaving, thereby enhancing rigidity and safety of the battery module and workability of assembly in a structure. Therefore, manufacturing costs are expected to be saved.

Description

Battery module equipped with a fastening strap {BATTERY MODULE WITH SLIDING AND JAM-FASTENING STRAP}

The present invention relates to a battery module provided with a locking strap, and more particularly, a strap for preventing separation of the upper cover by being caught on the upper cover among the protective frames for accommodating a plurality of stacked battery cells inside. It relates to a provided battery module.

Secondary batteries that repeatedly store and supply electrical energy have recently gone beyond the field of small high-tech electronic devices such as mobile phones, PDAs, and notebook computers, and have recently become an energy storage system (ESS) and an electric vehicle (EV, Electric Vehicle, Energy Storage System). ) or as a power source for hybrid electric vehicles (HEVs).

Currently, secondary batteries widely used in storage systems (ESS) or electric vehicles (EVs) can be classified into lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and the like. is repeated charging and discharging at an output voltage of approximately 25V to 42V per unit cell.

Therefore, when a higher output voltage and power capacity are required, a battery module is formed by connecting several battery cells, or these battery modules are connected again in series or parallel and other circuits are added to configure a high output battery pack.

At this time, when a battery pack is composed of a prismatic or pouch-type battery cell that can be stacked with a high degree of integration and has a small weight to capacity, if the battery cells are repeatedly charged and discharged, overcharging, overdischarging, short circuit, A swelling phenomenon in which the outer shell of a battery cell swells occurs due to various causes, such as being left at a high temperature.

Since this swelling phenomenon can lead to safety accidents such as ignition and explosion, as well as shortening the lifespan, lowering capacity, and lowering the performance of the secondary battery, the battery module stores and packages the stacked battery cells inside and performs external shocks, etc. A cover frame that protects the battery cells, a compression pad disposed between the battery cells to receive and pressurize the battery cells, and a cover frame assembled with each other to prevent deformation or separation of the cover frame by the swollen battery cells. It may be configured to include a strap to be additionally fastened.

In relation to such a battery module, Korean Patent Application Laid-Open No. 10-2015-0115252 (published date: October 14, 2015) discloses a technology for 'a battery module array including a case frame type 2-cell battery module'. are doing

The above-described prior art provides structural rigidity by firmly fixing the end plate 21 for pressing the secondary battery cells in the stacking direction and the 'C'-shaped tension-bar 30 through a bolt 31 as a separate fastening means. and space efficiency.

However, the structural rigidity improvement is limited in that the cover covering the upper surface of the battery module assembly 20 is not separately provided, and is configured to directly support the stacked battery module assembly 20 only with a pair of tension-bars 30 . However, there is a problem that the external diffusion cannot be effectively shielded in case of fire or explosion of the internal battery cell.

Republic of Korea Patent Publication No. 10-2015-0115252 (published date: October 14, 2015)

It is an object of the present invention to firmly prevent the detachment of the upper cover by being caught and fixed to the upper cover that blocks the external diffusion in case of fire or explosion of an internal battery cell without a separate work tool, and the rigidity, safety and assembly of the battery module To provide a battery module provided with a strap that can structurally improve the workability of the.

The above object is to provide a battery module including a protection frame for accommodating a battery unit configured by stacking a plurality of battery cells inside, the protection frame comprising: first and second side covers supporting both sides of the battery unit; front and rear covers on which a plurality of bus bars connected to the lead tabs of the battery cells are mounted and coupled to the first and second side covers to support the front and rear surfaces of the battery unit; upper and lower covers disposed to support the upper and lower surfaces of the battery unit, respectively; and a strap that is hooked and fixed to the upper cover through a slide assembly with respect to the upper cover and is coupled to the first and second side covers to prevent separation of the upper cover. This is achieved by the module.

The strap may include: a moving plate that slides from an upper surface of the upper cover toward the first and second side covers in a state of being seated in a long mounting groove and is caught and fixed to the upper cover; a support plate bent from one side of the moving plate to be in close contact with the first side cover; and an elastic plate bent so as to be elastically supported by the second side cover from the other side of the moving plate to force the slide assembly of the moving plate toward the second side cover.

After the plurality of fastening protrusions formed in the mounting groove are inserted, the strap may include a coupling hole formed through the moving plate to be caught and fixed according to the slide of the moving plate by the elastic plate.

In the mounting groove, for accurate slide assembly of the moving plate, a center line and an edge line disposed on both sides of the center line are formed to have two different depths, and the moving plate is formed to correspond to the mounting groove. It may be formed in a slidable shape.

The elastic plate is bent at an acute angle with respect to the moving plate to be elastically deformed or restored, and is formed extending from the deforming part and supported on the second side cover. It may include a second concave-convex portion to be engaged.

The support plate may include a first concave-convex portion supported on the first side cover and engaged with the first assembly protrusion formed on the first side cover.

According to the present invention, the upper cover is arranged to support the upper surface of the battery part among the protective frames for accommodating the battery part inside, and a strap that is easily caught and fixed to the upper cover through slide assembly without a separate work tool or equipment is first and second. As it has a structure that is firmly coupled to the side cover, the separation of the upper cover is prevented, so that the rigidity and safety of the battery module are improved, as well as the structural improvement of assembly workability, which can be expected to reduce manufacturing costs. It works.

1 is a perspective view of a battery module provided with a fastening strap according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of FIG. 1 .
FIG. 3 is a longitudinal cross-sectional view of the strap of FIG. 1 in the longitudinal direction.
4 to 7 are views each showing a process in which the strap of FIG. 1 is fastened to the upper cover step by step.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention.

1 is a perspective view of a battery module provided with a fastening strap according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a longitudinal cross-sectional view based on the longitudinal direction of the strap of FIG. 4 to 7 are views each showing a process in which the strap of FIG. 1 is fastened to the upper cover step by step.

Top (top), bottom (bottom), left and right (side or side), front (front, front), rear (back, back), etc., which refer to directions in the description and claims of the invention, etc. are not used for limiting rights. For convenience of explanation, it is determined based on the relative positions between the drawings and the configuration, and the three axes may be rotated to correspond to each other and changed, except where specifically limited otherwise.

The battery module 100 provided with a locking type strap according to the present invention is easily hooked and fixed to the upper cover 150a through slide assembly without separate work tools or equipment, and is attached to the first and second side covers 130a and 130b. It is an invention devised to structurally improve the workability of assembly through the strap 160 that is firmly coupled, and to prevent separation of the upper cover 150a to improve the rigidity and safety of the battery module.

In order to implement the above functions or actions in detail, the battery module 100 provided with a fastening strap according to an embodiment of the present invention is, as shown in FIGS. 1 to 3, the battery unit 110, protection The frame 120 and the strap 160 may be included.

Hereinafter, each configuration described above will be described in detail.

First, the battery unit 110, in order to form a predetermined output voltage and power, a plurality of pouch-type (flat plate-shaped) battery cells 10 are stacked so that the flat surfaces are horizontally overlapped. Can be configured. .

Between the plurality of battery cells 10 constituting the battery unit 110, a buffer case or polyurethane, etc. that prevents external changes due to the swelling phenomenon as described above and protects the battery cells 10 from external impact. A buffer pad formed of a material of may be interposed between the battery cells (10).

Here, the battery cell 10 includes a positive and negative electrode in the electrolyte, a film enclosing and sealing the electrolyte, the positive and negative plates, and a protruding plate-shaped electrode that electrically connects the positive and negative plates to the external bus bar 20 , respectively. The in-lead tab 12 may be included.

In this case, the lead tabs 12 may be respectively formed on the front and rear sides as shown in FIG.

The battery unit 110 as described above is merely a component in which the known and commercialized battery cells 10 are stacked in the transverse direction, and is irrelevant to the gist of the present invention, so a detailed description of the structure and operating characteristics thereof, etc. is to be omitted.

The protective frame 120 is a hexahedral-shaped component having an internal space to accommodate and protect the above-described battery unit 110 from external shocks or changing external environments. As shown in FIG. 2, the first, 2 side covers 130a and 130b, a front cover 140a, a rear cover 140b, an upper cover 150a, and a lower cover 150b may be included.

Here, the first side cover 130a and the second side cover 130b contact and support both sides of the battery unit 110 in which the swelling phenomenon occurs in the direction in which the battery cells 10 are stacked, and the battery unit 110 . It is a plate-shaped component composed of multiple structures that perform both electrical insulation and heat dissipation functions.

These first and second side covers 130a and 130b are coupled or fitted by various fastening means such as bolts and upper and lower covers 150a and 150b to be described later to form both side surfaces of the protection frame 120 . do.

The first and second side covers 130a and 130b according to the embodiment of the present invention have rigidity to suppress the swelling phenomenon, as well as dissipate heat generated in the battery unit 110 according to charging and discharging to the outside, and the battery unit For insulation against 110 , as shown in FIGS. 2 to 4 , it may be composed of an end plate 132 and a shielding plate 136 , and the like.

The end plate 132 is a plate-shaped component provided to smoothly transfer heat generated according to the operation of the battery unit 110 to the outside from both sides of the battery unit 110, respectively, and an aluminum alloy plate having excellent thermal conductivity, etc. is manufactured to form the outer, that is, the outer side of the first and second side covers 130a and 130b.

This end plate 132, the reinforcing unevenness 132a protruding in a predetermined shape in order to secure the necessary rigidity is formed by embossing press processing, and an insulating coating may be made on the surface for electrical shielding for the battery unit 110. .

At this time, the reinforcing unevenness 132a of a predetermined shape formed on the end plate 132 is the end that receives a direct pressing force during the swelling phenomenon of the battery cells 10 stacked in the transverse direction to constitute the battery unit 110 . It may have a structure provided to strengthen the rigidity of the plate 132 .

On the other hand, on the end plate 132 constituting the first and second side covers 130a and 130b, engaging in correspondence to the first concave-convex portion 164b and the second concave-convex portion 166b of the strap 160 to be described later. The first and second assembly protrusions 134a and 134b constituting the may be formed. The first and second assembly projections 134a and 134b are for guiding or instructing the rigid fixing and accurate assembly of the strap 160 .

The shielding plate 136 contacts and supports and insulates both sides of the battery unit 110, while the first and second side covers ( It is a plate-shaped component forming the inside of 130a, 130b).

The shielding plate 136 is, as shown in FIG. 2, by inserting the pre-fabricated end plate 132 into the mold, and then injecting an engineering plastic excellent in insulation, heat resistance, rigidity and flame retardancy to make the above-described end plate 132 ) and can be molded integrally.

Of course, the shielding plate 136 may be separately injection-molded from the above-described end plate 132 and then coupled to each other by various fastening methods such as fitting and bolting.

Engineering plastics used in the manufacture of the shielding plate 136, in order to reduce the weight of the protective frame 120 and to prepare for electrical shielding and heat generation of the battery cell 10 for the battery cell 10, PPS (Polyphenylene Sulfide), It may be an engineering plastic including at least one of polyetheretherketone (PEEK), thermoplastic polyimide (TPI), polyethersulfone (PES), polyphthalamide (PPA), and polyetherimide (PEI).

Here, PPS is a heat-resistant resin having excellent mechanical strength, chemical resistance, etc., and a working temperature of 240° C., and is an engineering plastic mainly used for electrical/mechanical parts requiring heat resistance due to flame-retardant properties.

And PEEK is a heat-resistant resin with excellent chemical and abrasion resistance, and a working temperature of 260°C. Even at a fairly high temperature, there is little change in mechanical strength or rigidity, and it has high utility in that it can be injection molded using a general injection machine. engineering plastics.

TPI is a heat-resistant resin with excellent abrasion resistance, rigidity, creep resistance, and chemical resistance, and a glass transition temperature of 250°C.

PES is a heat-resistant resin with high dimensional stability and excellent flame retardancy and a working temperature of 150 to 160°C.

PPA is a heat-resistant resin having excellent chemical resistance, low water absorption, and a use temperature of 185° C.

PEI is an engineering plastic mainly used for new material parts because it has excellent high rigidity, high strength, flame retardancy, dimensional stability, and especially electrical properties, and is a heat-resistant resin with a working temperature of 180°C.

The various heat-resistant resins mentioned above may be used for injection molding of the shielding plate 136 by selecting any one or by appropriately mixing two or more to implement the necessary physical properties.

In addition, in order to further enhance heat dissipation and rigidity, the shielding plate 136 may be manufactured by injection molding plastic obtained by adding a powder such as a graphene material or aluminum to the aforementioned engineering plastic as a filler.

Here, the graphene material is a component for supplementing the insufficient thermal conductivity and rigidity of the heat-resistant synthetic resin. As a next-generation new material, carbon atoms form a hexagonal lattice, that is, a honeycomb structure, and form a two-dimensional planar structure, It is thin and light, with a thickness of several nanometers to several tens of micrometers, and is 200 times stronger than steel, has excellent electrical and thermal conductivity, and has excellent physical and chemical properties as well as elasticity.

The front cover 140a and the rear cover 140b are disposed to support the front, which is the front side and the rear, which is the back side of the battery unit 110, respectively, to form the front and rear surfaces of the protection frame 120, respectively, as described above. The first and second side covers 130a and 130b may be fitted or coupled by various fastening means such as bolts.

A fixing groove in which the battery cell 10 is fitted may be formed in the front cover 140a and the rear cover 140b, and a seating groove in which the bus bar 20 is mounted and fixed is formed on a surface opposite to the fixing groove. can be

The bus bar 20 is electrically connected to the lead tab 12 of the above-described battery cell 10 to provide a plurality of conductors to stably transmit a high voltage output to the outside without loss, and an external circuit ( (not shown) may be manufactured in various forms, such as a bent rod shape for electrical connection with the battery cell 10 or a ring shape for parallel connection of the battery cells 10 .

When the bus bar 20 is coupled to the first and second side covers 130a and 130b, the front and rear covers 140a and 140b respectively penetrated by the lead tabs 12 of the battery cell 10 are coupled to the above-described first and second side covers 130a and 130b. It may be electrically connected to the lead tab 12 and may be bound to the lead tab 12 by welding or the like.

The front and rear covers 140a and 140b according to the embodiment of the present invention can be manufactured by press-working a metal material having excellent heat dissipation, that is, aluminum, etc. to form a fixing groove and a seating groove, and then insulating coating.

In addition, unlike the above, the front and rear covers 140a and 140b include at least one of PPS, PEEK, TPI, PES, PPA and PEI having excellent insulation, heat resistance, rigidity and flame retardancy like the above-described shielding plate 136 . It can also be manufactured by injection molding of engineering plastics.

At this time, the engineering plastic constituting the front and rear covers 140a and 140b may contain a powder such as a graphene material or aluminum as a filler to realize excellent heat dissipation and rigidity as described above. to be.

The upper cover 150a and the lower cover 150b are arranged to support the upper surface and the lower lower surface of the battery unit 110 described above, respectively, to block external diffusion in case of fire or explosion of the internal battery cell 10 As a plate-shaped component, an upper surface and a lower surface of the protective frame 120 are formed, respectively.

The upper cover 150a and the lower cover 150b according to the embodiment of the present invention do not attach a separate cooling plate, but heat generated according to the operation of the battery unit 110 by itself, respectively, in the battery unit ( 110), it has excellent thermal conductivity so that it can be transmitted smoothly to the outside from the top and bottom, and it can be manufactured from an aluminum alloy plate with reinforced rigidity with reinforcing projections.

In addition, the upper cover 150a and the lower cover 150b include at least one of PPS, PEEK, TPI, PES, PPA and PEI having excellent insulation, heat resistance, rigidity and flame retardancy like the above-described shielding plate 136 . It can also be manufactured by injection molding by adding powder, such as a graphene material or aluminum, which can implement excellent heat dissipation and rigidity to engineering plastics used as fillers.

As shown in FIG. 2 and the like, the upper cover 150a manufactured as described above may have irregularities protruding in a predetermined shape similar to the above-described end plate 132 to ensure necessary rigidity, and a strap ( The mounting groove 152 may be concavely recessed so that the 160 is not exposed to the outside and is seated inside the upper cover 150a.

The mounting groove 152 is formed long from the upper surface of the upper cover 150a toward the first and second side covers 130a and 130b, so that the moving plate 162 of the strap 160 can slide and move accurately. , can be formed with two different depths.

That is, as shown in the enlarged view of FIG. 2 , the mounting groove 152 has a central line 152a formed along the central portion to a deep depth, and an edge line 152b having a shallow depth disposed on both sides of the central line 152a. ) can be composed of

In addition, a plurality of fastening protrusions 154 may be formed at positions spaced apart from each other along the mounting groove 152 of the upper cover 150a.

At this time, the fastening protrusion 154 is not particularly limited as long as it is fitted in a coupling hole 168 to be described later to suppress the flow of the strap 160 .

However, at the upper end of the fastening protrusion 154, in order to prevent the strap 160 from being separated from or separated from the upper cover 150a due to vibration or shock applied to the battery module 100, an assembly hole of the strap 160 to be described later ( 168a), an enlarged extension protrusion 154a with a larger diameter may be formed.

The strap 160 is a component that is easily and firmly fixed to the upper cover 150a through slide assembly, which is an improved work method, without thermal fusion or bolt fastening that requires separate work tools or equipment.

Due to the strap 160 of the present invention, the separation prevention of the upper cover 150a and the rigidity and safety of the battery module 100 are improved, as well as the workability of assembly is structurally improved, thereby reducing the manufacturing cost. can be expected

Strap 160 according to an embodiment of the present invention, as shown in Figs. 2 and 3, can be secured to surround over the first and second side covers 130a and 130b and the upper cover 150a described above. Thus, it may be made of a plate member in the form of approximately '┏┓' consisting of a moving plate 162 , a support plate 164 , an elastic plate 166 , and a coupling hole 168 .

The strap 160 including the moving plate 162, the support plate 164, the elastic plate 166, and the coupling hole 168, includes the upper cover 150a and the first and second side covers 130a and 130b. In order to firmly support and fix the heat generated by the battery unit 110 and smoothly dissipate the heat generated by the battery unit 110, an alloy plate having excellent thermal conductivity and rigidity is pressed and integrally manufactured, and insulated on the surface for electrical shielding of the battery unit 110 A coating may be made.

Specifically, the moving plate 162 constituting the strap 160 is a plate-shaped component that slides while seated in the above-described mounting groove 152 and is hooked and fixed to the upper cover 150a, and the moving plate 162 ) for the slide movement and reinforcement of rigidity, a concave-convex structure corresponding to the mounting groove 152 having a depth of two steps may be formed together during the above-mentioned press working.

The support plate 164 is a plate-shaped component that is bent and fixed so as to be in close contact with the first side cover 130a at one side of the moving plate 162, that is, at the left end of FIGS. 2 and 3, and the holding part 164a. ) and the first concave-convex portion 164b.

Here, the grip portion 164a is a component protruding outward so as to be able to pull (P) the strap 160 toward the first side cover 130a, whereby the operator, etc. ) and the fastening protrusion 154 of the upper cover 150a can be easily through-coupled.

The first concave-convex portion 164b is a component having a shape that is engaged in correspondence to the first assembly protrusion 134a of the first side cover 130a described above, and thus the support plate 164 and the first side cover ( 130a) can be firmly fixed in place with each other, and the correct assembly of the support plate 164 can be guided and confirmed.

On the other hand, as shown in FIG. 3 , on the surface where the first concave-convex portion 164b and the first assembling protrusion 134a contact each other, the coupling force between the first concave-convex portion 164b and the first assembling protrusion 134a is applied. In order to further increase the predetermined welding (W) operation may be made.

The elastic plate 166 is in close contact with the second side cover 130b at the right end of the other side of the moving plate 162, that is, based on FIGS. 2 and 3, and is bent so as to be elastically supported toward the second side cover 130b. It is a plate-shaped component forcing the slide assembly of the moving plate 162 .

In this case, the elastic force of the elastic plate 166 may be the elastic force of the strap 160 itself, which is integrally manufactured by press-working an alloy plate having excellent thermal conductivity and rigidity, as described above, and the moving plate 162 and the support plate. Unlike (164), after press working, the elastic plate 166 or the elastic plate 166 may be partially strengthened by heat treatment around the periphery.

However, as shown in FIG. 4 , the elastic plate 166 according to the embodiment of the present invention may be configured to include a deformable portion 166a and a second concave-convex portion 166b.

Here, the deformable portion 166a is a component that is bent at an acute angle rather than at a right angle with respect to the moving plate 162 so that elastic deformation (ED) or restoration is made, which is a reinforced elastic force in comparison with the above-described support plate 164 . This is in order to be expressed in the elastic plate (166).

In this case, the bent deformable portion 166a may be partially heat-treated to adjust the elastic force as described above.

The second concave-convex portion 166b is extended from the deformable portion 166a and supported on the second side cover 130b, and engages in correspondence with the second assembly protrusion 134b of the second side cover 130b described above. It is a component of the shape that becomes

Due to the second concave-convex portion 166b and the second assembly protrusion 134b, the elastic plate 166 and the second side cover 130b can be firmly fixed in place with each other, and the elastic plate 166 is The correct assembly can be guided and verified.

On the other hand, as shown in Figure 3, the second concave-convex portion 166b and the second assembling protrusion 134b are in contact with each other, the coupling force between the second concave-convex portion 166b and the second assembling protrusion 134b is applied. In order to further increase the predetermined welding (W) operation may be made.

The coupling hole 168 is formed through each of the moving plate 162 so that, after the above-described plurality of fastening protrusions 154 are simultaneously inserted, the moving plate 162 is caught and fixed according to the slide of the moving plate 162 by the elastic plate 166 . is a component that becomes

The coupling hole 168 may simply be a long hole having a diameter through which the fastening protrusion 154 can pass and a length corresponding to the slide distance of the moving plate 162 .

However, the coupling hole 168 according to the embodiment of the present invention is, as shown in the enlarged view of FIG. It may be formed in an adjacent portion, and by forming an assembly hole 168a having a diameter corresponding to the fastening protrusion 154 of the lower end of the expansion protrusion 154a in a portion adjacent to the support plate 164 .

Due to the structure of the coupling hole 168, the moving plate 162 forcibly slid by the elastic restoration of the elastic plate 166 firmly engages the fastening protrusion 154 and the expansion protrusion 154a. As a result, it is not easily separated from or separated from the upper cover 150a even by vibration or shock applied to the battery module 100 .

The process in which the strap 160 having the structure as described above is easily caught and fixed to the upper cover 150a through slide assembly without separate work tools or equipment, and is firmly coupled to the first and second side covers 130a and 130b. 4 to 7 will be described as follows.

First, as shown in FIG. 4 , in a state in which the upper cover 150a is fastened to the first and second side covers 130a and 130b, the moving plate 162 is adjacent to the upper side of the fastening protrusion 154, such as a worker is inserted by pressing the strap 160 from the upper side of the upper cover 150a as shown in FIG. 5. (PD)

At this time, the elastic plate 166 (deformation portion 166a) bent at an acute angle with respect to the moving plate 162 is elastically deformed (ED) to the outside, and as it is elastically supported by the second side cover 130b, the moving plate ( 162) is forced to slide toward the second side cover (130b).

Next, the operator and the like, as shown in FIG. 6, pull the holding portion 164a of the support plate 164 so that the above-described expansion protrusion 154a and the coupling hole 168 are placed above and below each other (P) The strap 160, that is, the moving plate 162 is slid toward the first side cover 130a.

At this time, the elastic plate 166 is further elastically deformed (ED) while accumulating an elastic restoring force that strongly slides the moving plate 162 toward the second side cover 130b.

Next, when the operator or the like pulls the grip portion 164a as shown in FIG. 6 (P), and presses the strap 160 downward, the expansion protrusion 154a and the fastening hole are through-coupled with each other and the first, The second concave-convex portions 164b and 166b and the first and second assembly projections 134a and 134b form a locking coupling, respectively.

Finally, as shown in FIG. 7 , when the operator or the like removes the external force applied to the gripping part 164a, the moving plate 162 has the elastic restoring force of the elastic plate 166 accumulated according to the elastic deformation (ED). by forcibly sliding to the second side cover (130b).

According to this elastic restoring force, the coupling hole 168 of the moving plate 162 forms a strong engaging coupling with the fastening protrusion 154 and the expansion protrusion 154a of the upper cover 150a without special work tools or equipment. , the strap 160 is not easily separated from or separated from the upper cover 150a even by vibration or shock applied to the battery module 100 .

In the foregoing, specific embodiments of the present invention have been described and illustrated, but it is common knowledge in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have Accordingly, such modifications or variations should not be individually understood from the spirit or point of view of the present invention, and the modified embodiments should belong to the claims of the present invention.

10: battery cell
12: lead tab
20: bus bar
W: Weld
PD: Press
ED: elastic deformation
P: pull
100: battery module equipped with a fastening strap
110: battery unit
120: protection frame
130a, 130b: first and second side covers
132: end plate
132a: reinforcing concavo-convex
134a, 134b: first and second assembly projections
136: shielding plate
140a, 140b: front cover, rear cover
150a, 150b: upper and lower covers
152: mounting groove
152a, 152b: center line, edge line
154: fastening protrusion
154a: extension process
160: strap
162: moving plate
164: support plate
164a: grip part
164b: first uneven portion
166: elastic plate
166a: deformation part
166b: second uneven portion
168: coupling hole
168a: assembler

Claims (6)

A battery module comprising a protective frame for accommodating a battery part configured by stacking a plurality of battery cells therein,
The protection frame,
first and second side covers supporting both sides of the battery unit; front and rear covers on which a plurality of bus bars connected to the lead tabs of the battery cells are mounted and coupled to the first and second side covers to support the front and rear surfaces of the battery unit; upper and lower covers disposed to support the upper and lower surfaces of the battery unit, respectively; and a strap that is fastened to the upper cover through a slide assembly with respect to the upper cover and is coupled to the first and second side covers to prevent separation of the upper cover,
The strap is
a moving plate that slides from the upper surface of the upper cover toward the first and second side covers in a state of being seated in the long mounting grooves and is latched and fixed to the upper cover; a support plate bent from one side of the moving plate to be in close contact with the first side cover; and an elastic plate that is bent so as to be elastically supported by the second side cover from the other side of the moving plate to force the slide assembly of the moving plate toward the second side cover,
After the plurality of fastening protrusions formed in the mounting groove are inserted, it includes a coupling hole formed through the moving plate so as to be caught and fixed according to the slide of the moving plate by the elastic plate,
The elastic plate,
A deformable portion that is elastically deformed or restored by being bent at an acute angle with respect to the moving plate, and a second extending from the deforming portion, supported by the second side cover, and engaged with a second assembly protrusion formed on the second side cover. A battery module provided with a locking type strap, characterized in that it includes an uneven portion. delete delete According to claim 1,
The mounting groove is
For accurate slide assembly of the moving plate, the center line and the edge line disposed on both sides of the center line are formed in two different depths,
The moving plate is
A battery module provided with a locking strap, characterized in that it has a slidable shape corresponding to the mounting groove. delete According to claim 1,
The support plate is
The battery module provided with a locking type strap, characterized in that it is supported on the first side cover and includes a first concave and convex portion that is engaged with the first assembly protrusion formed on the first side cover.

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