KR102388157B1 - Battery module having a pressurization structure for stacked battery cells - Google Patents

Abstract

Disclosed is a battery module having a pressurization structure for stacked battery cells. The present invention comprises: a battery unit in which a plurality of pouch-type battery cells are stacked in a horizontal direction; and a hexahedron-shaped protection frame having an inner space for accommodating and protecting the battery unit, wherein the protection frame includes: upper and lower covers arranged to support upper and lower surfaces of the battery unit; front and rear covers to which a plurality of bus bars connected to the lead tabs of the battery cells are mounted and coupled to the upper and lower covers to support front and rear surfaces of the battery unit; a pair of side covers coupled to the upper and lower covers to support both sides of the battery unit where swelling phenomenon occurs; and a pressure plate disposed inside the side cover for electrical insulation and heat dissipation of the battery unit and to which pressing force is applied so that the bus bar is connected and the covers are assembled while pressurizing both side surfaces of the battery unit. According to the present invention, as pressure or pressurizing is maintained on both sides of the battery unit during the connection of the bus bar and the assembly of the covers, the unevenness of the electrolyte solution filled in the stacked battery cells or the poor welding of the bus bar connected to the battery cells etc. are reduced so that reliable charging and discharging operations of the battery unit can be stably performed.

Description

BATTERY MODULE HAVING A PRESSURIZATION STRUCTURE FOR STACKED BATTERY CELLS

The present invention relates to a battery module having a pressurization structure for a stacked battery cell, and more particularly, to enable connection of a bus bar and assembly of a protection frame in a state in which both sides of a battery part are pressed through a predetermined pressurization structure. It is about a battery module.

A secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. , Electric Vehicle, Energy Storage System) or hybrid vehicle (HEV, Hybrid Electric Vehicle) is used as a power source.

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

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

That is, the battery module refers to an aggregate in which a plurality of secondary batteries are bundled at the middle and upper ends, and the battery pack refers to a large-scale assembly in which battery modules are assembled again to increase capacity and output.

The number of battery cells included in such a battery pack may be variously increased or decreased according to a required output voltage or power capacity.

At this time, while the battery cells constituting the battery pack are repeatedly charged and discharged, a swelling phenomenon in which the outer skin of the battery cells swells due to various causes such as overcharging or overdischarging, short circuit, and leaving at high temperature. this will happen

Since this swelling phenomenon can lead to safety accidents such as ignition and explosion, as well as shortening the lifespan, reduction of capacity, and performance of the secondary battery, spaced apart battery cells at regular intervals in the battery module unit, or The deformation of the battery module due to swelling is prevented by arranging a compression pad for pressure support between the battery cells or manufacturing a frame in the form of a box-shaped steel plate.

At this time, the method of manufacturing the frame in the form of a box-type steel plate is to prevent swelling and stack the batteries through a press device, etc. so that the electrolyte filled in the plurality of stacked pouch-type battery cells is evenly spread out for constant and stable output. In a state in which both sides of the sieve are constantly pressurized, the output terminals such as bus bars are bonded by welding, and a box-shaped frame is assembled on the outside to form a battery module.

However, the housing of the conventional battery module, such as 'end plate for battery module assembly and battery pack including the same' of Korean Patent Application Laid-Open No. 10-2015-0142790 (published on December 23, 2015), is a battery module caused by a swelling phenomenon. Although it is possible to reduce the external impact and external impact of the bus bar, etc., due to a structural problem in which the pressing force applied to the pouch-type battery cell is temporarily removed in the sequential assembly process of the outer frame after welding the bus bar, non-uniformity of the electrolyte or damage to the bus bar Welding defects may occur.

Therefore, the battery module housing or frame that can safely protect the battery cells from external shocks or swelling, and maintain a constant pressurization state for the battery cells until the assembly of the box-type frame forming the battery module is completed. Structural improvement or improvement is needed in many ways.

Republic of Korea Patent Publication No. 10-2015-0142790 (published date: December 23, 2015)

An object of the present invention is a pressing structure for a stacked battery cell in which the connection of the bus bar by welding and the assembly of the covers constituting the protection frame can be made in a state in which both sides of the battery part in which the pouch-type battery cells are stacked are constantly pressed. It is to provide a battery module having a.

The above object, a battery unit in which a plurality of pouch-type battery cells are stacked in the transverse direction; and a protective frame having a hexahedral shape having an inner space to accommodate and protect the battery part, the protective frame comprising: upper and lower covers arranged to support upper and lower surfaces of the battery part; 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 upper and lower covers to support the front and rear surfaces of the battery unit; a pair of side covers coupled to the upper and lower covers to support both sides of the battery unit in which the swelling phenomenon occurs; and a pressing plate disposed inside the side cover for electrical insulation and heat dissipation of the battery unit and to which a pressing force is applied so that the bus bar is connected and the covers are assembled in a state where both sides of the battery unit are pressed. It is achieved by a battery module having a pressurization structure for a stacked battery cell, characterized in that.

The pressure plate may include: a plate-shaped shielding plate for pressing and supporting both sides of the battery unit; And at least one of the shielding plate is formed to protrude so as to penetrate the side cover may include a pressure rod detachably coupled to the press device for providing the pressing force.

The shielding plate is injection-molded with engineering plastic having excellent insulation, heat resistance, heat dissipation, rigidity and flame retardancy for electrical insulation and heat dissipation of the battery part, and the pressure rod is integrally molded with the injection-molded shielding plate. can

The pressure rod is made in the shape of a pipe in which the shielding plate is blocked in order to reduce the weight of the protection frame itself and to provide constant pressure and heat dissipation to the battery part, and on the inner surface of the pressure rod, it protrudes toward the center, and A plurality of reinforcing ribs formed to be elongated along the direction of the pressing force and spaced apart along the circumference to enhance the rigidity of the pressing rod may be further provided.

The shielding plate may have a plurality of hollows formed therein, and a phase change material may be filled in the hollows.

According to the present invention, it is disposed inside the side cover supporting both sides of the battery part in which the swelling phenomenon occurs among the hexahedral protective frame that accommodates and protects the battery part in which a plurality of pouch-type battery cells are stacked in the horizontal direction inside. As the pressure plate that performs electrical insulation and heat dissipation functions for the battery part is formed in a structure that can constantly press or press both sides of the battery part while connecting the bus bar and assembling the covers, it is charged in the stacked battery cells. Reliable charging and discharging operations of the battery part composed of battery cells can be stably performed by reducing or preventing non-uniformity of the electrolyte solution or welding defects of bus bars connected to the battery cells.

1 is a perspective view of a battery module having a pressurization structure for a stacked battery cell according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of FIG. 1 .
3 is a cross-sectional view of a side cover constituting the battery module of FIG. 1 and a pressing plate forming a pressing structure.
4 is a diagram schematically illustrating a process of manufacturing the battery module of FIG. 1 step by step.
5 is a plan view showing the structure of the battery pack in which the battery module of FIG. 1 is mounted.

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 having a pressing structure for a stacked battery cell according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a side cover and pressurization constituting the battery module of FIG. It is a cross-sectional view of a pressure plate forming a structure, FIG. 4 is a schematic step-by-step view of the manufacturing process of the battery module of FIG. 1 , and FIG. 5 is a plan view showing the structure of the battery pack in which the battery module of FIG. 1 is mounted am.

Top (top), bottom (bottom), left and right (side or lateral), 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 having a pressurization structure for the stacked battery cells according to the present invention is a medium-level power supply source that provides predetermined power by connecting a plurality of battery cells 10 in series and in parallel, by welding or the like. This invention was devised to keep the pressing force on the stacked battery cells 10 structurally constant while the bus bar 20 is connected and the protective frame 120 is assembled.

As above, since the pressing force on the plurality of battery cells 10 is maintained until the connection of the bus bar 20 and the assembly of the protection frame 120 are completed, the non-uniformity of the electrolyte filled in the battery cells 10 or the battery cells 10 ) and welding defects of the bus bar 20 connected to it can be fundamentally reduced or prevented.

In order to implement the above functions or actions in detail, the battery module 100 according to an embodiment of the present invention includes a battery unit 110 and a protection frame 120 as shown in FIGS. 1 to 3 . can be included.

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

First, the battery unit 110 is a component made by stacking a plurality of pouch-type (flat plate-shaped) battery cells 10 so that the flat surfaces are horizontally overlapped to form a predetermined output voltage and power. .

Between the plurality of battery cells 10 constituting the battery unit 110, a material such as polyurethane that prevents external changes due to the swelling phenomenon as described above and protects the battery cells 10 from external impact is used. The formed buffer pad may be interposed.

Here, the battery cell 10 includes a pair of lead tabs 12, which are protruding plate-shaped electrodes that electrically connect the positive and negative plates in the electrolyte, and the respective positive and negative plates to the external bus bar 20, respectively. 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 well-known and commercialized battery cells 10 are stacked in the transverse direction, and is not related to the gist of the present invention. is to be omitted.

The protection 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 a changing external environment, and as shown in FIGS. 1 and 2 , It may be configured to include an upper cover 130a, a lower cover 130b, a pair of side covers 150a and 150b, a front cover 140a, a rear cover 140b, and a pressure plate 160, and the like.

The upper cover 130a and the lower cover 130b are plate-shaped components arranged to support the upper and lower surfaces of the battery unit 110, respectively, and the upper and lower surfaces of the protective frame 120 are will form

The upper cover 130a and the lower cover 130b 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 smoothly transmitted to the outside from above and below, and it can be manufactured from an aluminum alloy plate with reinforced rigidity with reinforcing projections.

In addition, the upper cover 130a and the lower cover 130b may be manufactured by injection molding an insulating and heat-resistant synthetic resin using a powder such as a graphene material or aluminum that can implement excellent heat dissipation and rigidity as a filler. there is.

Here, the graphene material is a component to compensate for 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, but is 200 times stronger than steel, has excellent electrical and thermal conductivity, and has excellent physical and chemical properties as well as elasticity.

And the insulating and heat-resistant synthetic resin, PPS (Polyphenylene Sulfide), PEEK (Polyphenylene Sulfide), PEEK ( Polyetheretherketone), TPI (Thermoplastic Polyimide), PES (Polyethersulfone), PPA (Polyphthalamide), and may be an engineering plastic including at least one of PEI (Polyetherimide).

Here, PPS is a heat-resistant resin having excellent mechanical strength, chemical resistance, etc., and having a use 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 injection molding using a general injection machine is possible. 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 very good 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., excellent in combustion resistance, rigidity and chemical resistance.

The various heat-resistant resins mentioned above may be used for injection molding of the upper cover 130a and the lower cover 130b by selecting any one or appropriately mixing two or more in order to realize the necessary physical properties, and to enhance cooling performance. It can also be used for injection molding in which a cooling plate made of insulating-coated aluminum is inserted therein.

The front cover 140a and the rear cover 140b are configured to seal the bus bars 20 from outside air so that the plurality of bus bars 20 electrically connected to the above-described lead tabs 12 are not contaminated by external foreign substances. As a plate-shaped component, it supports the front and rear surfaces of the battery unit 110, respectively, and forms the front and rear surfaces of the protection frame 120 in a form coupled to the bracket 142 on which the bus bar 20 is mounted. .

Here, the bracket 142 is disposed to support the front, which is the front side, and the rear, which is the back side of the battery unit 110, respectively, and is fitted and coupled to the above-described upper and lower covers 130a and 130b (or side covers 150a and 150b). It is a component coupled by various fastening means such as bolts or the like.

At this time, a fixing groove into which the battery cell 10 is fitted may be formed on one surface of the bracket 142 facing the battery unit 110 , and the bus bar 20 is mounted and fixed on the other surface opposite to the one surface on which the fixing groove is formed. A seating groove may be formed.

The bus bar 20 is electrically connected to the lead tab 12 of the battery cell 10 and is a conductor provided to stably transmit a high voltage output to the outside without loss, and an external circuit (not shown) It can 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 .

The bus bar 20 is mounted on the bracket 142 when the bracket 142 penetrated by the lead tab 12 of the battery cell 10 is coupled to the upper and lower covers 130a and 130b, and the bus The lead tab 12 bent so as to come into contact with the surface of the bar 20 and welding, etc. form an electrically strong connection to each other.

At this time, although not specifically shown, the adjacent bus bars 20 may be electrically connected to each other through a flexible substrate (not shown) or a circuit board (not shown) installed on the bracket 142 .

The bracket 142 as described above may be manufactured by press-working a metal material having excellent heat dissipation properties, such as aluminum, to form a fixing groove and a seating groove, and then insulating coating.

On the other hand, the front and rear covers 140a and 140b according to the embodiment of the present invention smoothly transfer the heat (resistance heat) of the bus bar 20 generated according to the charging and discharging of the battery unit 110 to the outside in addition to the sealing function. For electrical insulation of the bus bar 20, a powder such as a graphene material or aluminum, which has excellent thermal conductivity and is capable of realizing rigidity, as a filler, similarly to the above-described upper and lower covers 130a and 130b. It can also be manufactured by injection molding a heat-resistant synthetic resin.

In this case, the heat-resistant synthetic resin forming the front and rear covers 140a and 140b is an engineering plastic, and may include at least one of PPS, PEEK, TPI, PES, PPA, and PEI as described above.

The side covers 150a and 150b are arranged to support both sides of the battery unit 110 in which the swelling phenomenon occurs together with the pressure plate 160 to be described later, and are formed in a plate shape to form both side surfaces of the protection frame 120 . As an element, the above-described upper and lower covers 130a and 130b (or front and rear covers 140a and 140b) may be fitted or coupled by various fastening means such as bolts.

The side covers 150a and 150b according to the embodiment of the present invention, like the above-described upper and lower covers 130a and 130b, are not attached with a separate cooling plate, but rather the battery unit 110 by itself. It has excellent thermal conductivity so that the heat generated according to the operation of the battery unit 110 can be smoothly transferred to the outside from both side surfaces of the .

In addition, the side covers 150a and 150b may be manufactured by injection molding a heat-resistant synthetic resin using a graphene material having excellent thermal conductivity and realization of rigidity as a filler or powder such as aluminum.

Here, since the heat-resistant synthetic resin is the same as that described above, a description thereof will be omitted.

However, since the side covers 150a and 150b may receive a direct pressing force during the swelling phenomenon of the battery cells 10 stacked in the transverse direction to constitute the battery unit 110, the above-described upper cover 130a. It may be preferable to apply a material having strong rigidity and the reinforcing unevenness 152 .

The pressure plate 160 firmly supports both sides of the battery unit 110 in which the swelling phenomenon occurs directly together with the side covers 150a and 150b as described above in doubly, and electrically insulating and dissipating heat from the battery unit 110 . A component that performs a function and enables the connection of the bus bar 20 and the assembly of the above-described covers 130a, 130b, 140a, 140b, 150a and 150b in a state where both sides of the battery unit 110 are pressed. am.

As shown in FIG. 4( a ), the pressure plate 160 is a battery unit 110 in which the battery cells 10 are sequentially stacked in a state coupled to the side covers 150a and 150b described above. When placed in contact with both sides, respectively, and seated on the press device 4 installed on the robot arm 5, etc. together with the battery unit 110, the pressing force from the press device 4 separately from the side covers 150a and 150b is provided to constantly press the battery unit 110 .

In order to receive a pressing force directly from the press device 4 separately from the side covers 150a and 150b as described above, the pressing plate 160 according to an embodiment of the present invention is as shown in FIGS. 2 and 3 . Likewise, it may be configured to include a shielding plate 162 and a pressing rod 164 .

The shielding plate 162 contacts and supports both sides of the battery unit 110 and presses, while electrically insulating the battery unit 110, and dissipates the heat generated in the battery unit 110 from the side cover 150a, 150b) is a plate-shaped component disposed on the inside of the side cover (150a, 150b) to deliver.

The shielding plate 162 according to the embodiment of the present invention may be injection-molded with engineering plastic having excellent insulation, heat resistance, heat dissipation, rigidity and flame retardancy for electrical insulation and heat dissipation of the battery unit 110 .

In this case, the engineering plastic used for manufacturing the shielding plate 162 may be a plastic having a composition including at least one of PPS, PES, and PEI in order to implement a particularly required flame retardancy.

The required characteristics related to the shield plate 162 as described above form a double structure with the above-described side covers 150a and 150b to strongly suppress the swelling of the battery unit 110, and efficient thermal management of the battery unit 110 and the battery unit 110 in order to delay the spread in case of fire.

Meanwhile, in the shielding plate 162 , a plurality of hollows S filled with a phase change material (PM) may be formed therein in order to reduce or buffer the temperature difference between the battery unit 110 and the outside air.

Here, the phase change material (PM) is a temperature control material that changes state from a solid to a liquid and from a liquid to a solid based on a specific temperature range and stores (endothermic) or emits (radiates heat) heat, respectively, an organic material, an inorganic material Alternatively, it may be prepared so as to be phase-changed in any intended temperature range using various materials of plants obtained in nature.

Among the phase change materials (PM) manufactured as described above, the phase change material (PM) filled in the plurality of hollows (S) according to an embodiment of the present invention minimizes the temperature difference between the inside and the outside of the battery module 100, so that the battery unit 110 ), it may be an organic paraffinic wax having a phase change temperature range set to 30°C to 35°C or an organic paraffinic wax having a phase change temperature range set to 15°C to 20°C.

When the phase change material (PM) in this temperature range is selectively filled in different hollows (S), even if the temperature inside or outside the battery unit 110 exceeds 35°C, the battery unit 110 operates optimally in response to this. It is possible to maintain the upper limit of the temperature at 30°C to 35°C constant for a certain period of time.

In addition, even when the temperature inside or outside the battery unit 110 is lower than 15°C, the battery unit 110 can constantly maintain the lower limit of the optimum operating temperature of 15°C to 20°C for a certain period of time.

As described above, when the phase change material (PM) having different phase change temperature ranges is simultaneously applied to the shielding plate 162 of the present invention, the battery pack 1 as shown in FIG. 5 , the battery unit 110 ), it is not significantly affected by heat generated by the operation or external temperature, and the ideal and optimal operating temperature of 15°C to 35°C is constantly maintained, and power can be transmitted stably.

Furthermore, the heat is thermally buffered through the shielding plate 162 and continuously emitted through the side covers 150a and 150b along the blowing path 3 by the cooling system 2 provided in the battery pack 1 . By being discharged quickly and consistently, thermal management of the battery unit 110 can be performed more efficiently.

Pressing rod 164, the press device 4 and the press device 4 so that the pressing on both sides of the battery unit 110 is directly made through the shield plate 162 disposed on the inside separately from the side covers (150a, 150b) It is a component that connects between the shielding plates 162 .

The pressure rod 164, specifically, as shown in Figures 2 and 3, at least one or more may be a bar shape protruding from the shield plate 162 to penetrate the side covers (150a, 150b).

As above, when the bar-shaped pressure rod 164 passing through the side covers 150a and 150b is directly and detachably coupled to the press device 4 mounted on the robot arm 5, etc., the side covers 150a and 150b ) is a smooth assembly with the remaining covers (130a, 130b, 140a, 140b, 142) as it can be freely moved and positioned in a predetermined range along the pressure rod 164 regardless of the pressure of the press device 4 The coupling can be made. (See Fig. 4 (b))

That is, the space in which the side covers 150a and 150b freely move in a predetermined range along the pressing rod 164 as shown in FIG. 4(b) is manufactured separately from the side covers 150a and 150b. A plurality of pressure rods 164 from the shielding plate 162 are formed to protrude through the side covers 150a and 150b, and are formed by being directly detachably coupled to the press device 4 .

The pressure rod 164 according to the embodiment of the present invention is shielded as shown in FIG. 3 for lightening the weight of the protection frame 120 itself, and for uniform and constant pressure and heat dissipation of the face-to-face surface to the battery unit 110 . The plate 162 may be formed in the shape of a blocked hollow pipe.

At this time, on the inner surface of the pressure rod 164, it protrudes toward the center of the pipe shape and is formed long along the direction of the pressure applied to the pressure rod 164 from the press device 4, and is spaced apart along the circumference of the inner surface. A plurality of reinforcing ribs 164a may be further formed.

Due to the plurality of reinforcing ribs 164a, the rigidity and heat dissipation of the pressing rod 164 may be further strengthened.

The pressure rod 164 as described above, like the above-described shield plate 162, for electrical insulation and heat dissipation to the battery unit 110, PPS, PES, and PEI excellent in insulation, heat resistance, heat dissipation, rigidity and flame retardancy It may be integrally molded with the shielding plate 162 by injecting engineering plastic having a composition including at least one.

On the other hand, unlike the figure, the pressure rod 164 may be formed in the shape of a hollow pipe penetrating up to the shielding plate 162 so that the battery unit 110 and the outside air communicate with each other.

In this case, a temperature sensor and a cooling fan may be further provided in the inner through-hole of the pressure rod 164 to suppress heat generation from the battery unit 110 .

Here, the temperature sensor is a component for detecting whether the battery unit 110 is above a set temperature, and at least one or more is installed on one surface of the shielding plate 162 facing the battery unit 110 or provided inside the through hole. can be

In addition, the cooling fan is a component provided inside the through hole to transmit heat of the battery unit 110 to the outside based on the temperature measured by the temperature sensor, and a blocking plate for selectively blocking air flow through the through hole is provided. It may be a commercially available blower.

The suppression of heat generation of the battery unit 110 by the temperature sensor and the cooling fan as described above is controlled by a control unit (not shown) according to the temperature measured by a temperature sensor electrically connected to a control unit (not shown) that integrally controls the battery pack 1 and the like. ) can be achieved by adjusting the rotation direction and rotation speed of the cooling fan 164b, the operation of the blocking plate, and the like.

As described above, the pressure plate 160 is shown in FIG. 4 (a) together with the battery unit 110 in which the battery cells 10 are stacked after forming the assembly with the side covers 150a and 150b. It is seated on the press device 4 installed on the robot arm 5 or the like.

And as shown in (b) of Figure 4, the shield plate 162 is provided with a pressing force directly from the press device 4 through the pressing rod 164 separately from the side covers (150a, 150b), the battery unit ( 110) is constantly pressed (see FIG. 2).

And in a state in which the pressure of the shield plate 162 against the battery unit 110 is maintained, the bracket 142 is movable in a certain range, unlike the pressure plate 160 constrained to the pressure force, on the side covers 150a and 150b. It can be freely fitted or coupled through various fastening means such as bolts.

And when the bus bar 20 is mounted on the bracket 142 coupled to the side covers 150a and 150b, the lead tab 12 may be firmly connected to the bus bar 20 by welding or the like.

And as shown in (c) of FIG. 4, in a state in which the pressing state of the pressing plate 160 (shielding plate 162) against the battery unit 110 is continuously maintained, the front and rear covers 140a and 140b) The coupling between the and the side covers 150a and 150b and the coupling between the upper and lower covers 130a and 130b and the side covers 150a and 150b are sequentially performed, respectively, so that the final assembly of the battery module 100 can be completed.

At this time, the coupling order between the brackets 142, the front and rear covers 140a and 140b and the upper and lower covers 130a and 130b for the side covers 150a and 150b may be arbitrarily changed according to the needs of the process. is of course

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 technical spirit or point of view of the present invention, and modified embodiments should be said to belong to the claims of the present invention.

1: battery pack
2: Cooling system
3: blow path
4: press device
5: Robot arm
10: battery cell
12: lead tab
20: bus bar
100: a battery module having a pressurization structure for a stacked battery cell
110: battery unit
120: protection frame
130a, 130b: upper cover, lower cover
140a, 140b: front cover, rear cover
142: bracket
150a, 150b: side cover
152: reinforcing irregularities
160: pressure plate
162: shield plate
S: hollow
PM: phase change substance
164: pressure rod
164a: reinforcing rib

Claims (5)

a battery unit in which a plurality of pouch-type battery cells are stacked in a transverse direction; And as a battery module comprising a hexahedral protective frame provided with an inner space to accommodate and protect the battery unit,
The protection frame,
upper and lower covers disposed to support the upper and lower surfaces 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 upper and lower covers to support the front and rear surfaces of the battery unit; a pair of side covers coupled to the upper and lower covers to support both sides of the battery unit in which the swelling phenomenon occurs; and a pressing plate disposed inside the side cover for electrical insulation and heat dissipation of the battery unit and to which a pressing force is applied so that the bus bar is connected and the covers are assembled in a state where both sides of the battery unit are pressed. but,
The pressure plate,
a plate-shaped shielding plate that contacts and supports both sides of the battery unit; And at least one of the shielding plate is formed to protrude so as to penetrate the side cover comprising a pressure rod detachably coupled to the press device for providing the pressing force,
The pressure rod,
In order to reduce the weight of the protection frame itself, and to uniformly pressurize and dissipate heat to the battery part, the shielding plate is formed in a closed pipe shape,
On the inner surface of the pressure rod,
A battery having a pressing structure for a stacked battery cell, characterized in that the plurality of reinforcing ribs protruding toward the center and extending along the direction of the pressing force, are spaced apart along the circumference to strengthen the rigidity of the pressing rod, are further provided. module. delete According to claim 1,
The shielding plate is
Injection-molded with engineering plastic excellent in insulation, heat resistance, heat dissipation, rigidity and flame retardancy for electrical insulation and heat dissipation of the battery part,
The pressure rod,
A battery module having a pressurization structure for a stacked battery cell, characterized in that it is integrally molded with the injection-molded shielding plate. delete According to claim 1,
The shielding plate is
A battery module having a pressurization structure for a stacked battery cell, characterized in that a plurality of hollows are formed therein, and a phase change material is filled in the hollows.

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