Title of Invention: Battery pack to which heat diffusion prevention structure between battery modules is applied
technical field
[One]
The present invention relates to a battery pack including two or more battery modules, and more particularly, to a battery pack to which a thermal diffusion prevention structure that can effectively block heat propagation to surrounding battery modules when any one battery module generates heat is about
[2]
This application is a priority claim application for Korean Patent Application No. 10-2020-0116407 filed on September 10, 2020, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
background
[3]
Semi-permanent batteries that convert electrical energy into chemical energy and repeat charging and discharging are called secondary batteries, as distinguished from primary batteries that cannot be reused after being used once.
[4]
The secondary battery includes a lithium secondary battery, a nickel cadmium (Ni-Cd) battery, a lead acid battery, a nickel hydride (Ni-MH) battery, a zinc air battery, an alkali manganese battery, and the like. Among them, lead-acid batteries and lithium secondary batteries are the most actively commercialized secondary batteries.
[5]
In particular, the lithium secondary battery has advantages such as high energy storage density, light weight and miniaturization, excellent safety, low discharge rate, and long lifespan. For reference, lithium secondary batteries are generally classified into cylindrical, prismatic, and pouch types according to their manufacturing type, and their uses are spread over not only electric vehicle batteries, but also ESS batteries and other electric devices.
[6]
Currently, one lithium secondary battery (cell) cannot obtain sufficient output to drive an electric vehicle. In order to apply a secondary battery as an energy source for an electric vehicle, it is necessary to configure a battery module in which a plurality of lithium-ion battery cells are connected in series and/or in parallel. In general, a battery module (BMS) that connects the battery modules in series and functionally maintains them is required. Management System), cooling system, BDU (Battery Disconnection Unit), and battery pack including electrical wiring cables.
[7]
On the other hand, since the secondary battery accompanies a chemical reaction during charging and discharging, performance may deteriorate when used in an environment higher than an appropriate temperature, and there is a risk of ignition or explosion if the secondary battery rises significantly above the static temperature. In the case of a battery module having a structure in which such secondary batteries are intensively accommodated in the module housing, heat emitted from the secondary batteries may be summed, and the temperature of the battery module may rise more rapidly and severely.
[8]
Moreover, the battery pack includes a plurality of battery modules, and an abnormal situation may occur in some battery modules or some of the secondary batteries constituting the battery module, and heat may occur, and such heat may reduce the temperature of the battery module. When the temperature is continuously increased and exceeds a predetermined threshold temperature, other battery modules in the vicinity may go into a thermal runaway situation. If such heat or thermal runaway situation is not properly controlled, the safety of the battery pack cannot be properly guaranteed.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[9]
The present invention was devised in consideration of the above-described problems, and it is an object of the present invention to provide an insulating structure between battery modules capable of stably blocking thermal runaway propagation to surrounding battery modules when some battery modules among a plurality of battery modules generate heat. There is this.
[10]
However, the technical problems to be solved by the present invention are not limited to the above-described problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.
means of solving the problem
[11]
A battery pack according to an embodiment of the present invention for solving the above-described problems, a plurality of battery cells and a plurality of battery modules having a module housing accommodating the plurality of battery cells; an insulating material interposed between two battery modules facing each other in the plurality of battery modules; and a compression preventing member provided with a rigid material and disposed in contact with the outer surfaces of the two battery modules having both ends facing each other through the heat insulating material.
[12]
The module housing may include a top plate forming an upper portion and a lower portion of the module housing, respectively; and a bottom plate; and a pair of side plates respectively forming a left side and a right side of the module housing, wherein the battery cells are pouch-type battery cells, which are stacked with a wide side upright, and are arranged in a stacked arrangement inside the module housing. An outermost battery cell may be accommodated in a form disposed to face the pair of side plates, and the heat insulating material and the compression preventing member may be configured to contact each of the side plates of the two battery modules facing each other.
[13]
When specifying that the two facing battery modules are a first battery module and a second battery module, the insulating material is provided to surround at least a portion of one side of the side plate and at least a portion of the top plate in the first battery module. 1 insulation pad; and a second insulating pad provided to surround at least a portion of one side of the side plate and at least a portion of the top plate in the second battery module.
[14]
The first heat insulating pad and the second heat insulating pad may be provided symmetrically.
[15]
Each of the first insulation pad and the second insulation pad may include a wall portion having an area corresponding to the side plate and a bent portion bent at an upper end of the wall portion and disposed in parallel with the top plate.
[16]
The wall portion may include at least one through hole that is formed through the wall portion in a thickness direction, and the compression preventing member may be inserted into the at least one through hole.
[17]
The at least one through-hole may be three through-holes, and one of the three through-holes may be located at the center of the wall part, and the other two may be located symmetrically on the left and right sides of the center.
[18]
The compression preventing member may include a first compression preventing member inserted into the wall portion of the first insulating pad and a second compression preventing member being inserted into the wall portion of the second insulating pad.
[19]
The first anti-compression member and the second anti-compression member may each include an insertion limiting portion formed with a larger diameter than the through hole; And it may be provided in a tube or tube shape including an insertion tube portion formed in a smaller diameter than the insertion limiting portion is disposed inside the through hole.
[20]
The insertion limiting part of the first compression prevention body may be configured to contact the side plate of the first battery module, and the insertion restriction part of the second compression prevention body may be configured to contact the side plate of the second battery module.
[21]
Ends of the inserted tube portion of the first compression prevention body and the insertion tube portion of the second compression prevention body may be configured to contact each other.
[22]
The compression preventing member may be formed of a ceramic fiber material.
[23]
a first thermally conductive sheet and a second thermally conductive sheet disposed between the first thermally conductive pad and the second thermally conductive pad, and a third thermally conductive pad interposed between the first thermally conductive sheet and the second thermally conductive sheet; may include
[24]
The first thermally conductive sheet includes a first heat dissipation part provided in a bent and extended shape in a direction parallel to the top plate of the first battery module, and the second thermally conductive sheet is disposed on the top plate of the second battery module. The second heat dissipation unit may be provided in a form in which an upper portion is bent and extended in a parallel direction.
[25]
A pack cover for exchanging heat in contact with the first heat dissipation unit and the second heat dissipation unit may be further included.
[26]
According to another aspect of the present invention, an electric vehicle including the above-described battery pack may be provided.
Effects of the Invention
[27]
According to one aspect of the present invention, thermal runaway propagation between battery modules can be stably blocked by preventing deterioration of the performance of the insulator.
[28]
In other words, when the battery module heats up, the external shape of the module housing may be changed due to swelling of the secondary batteries therein. In this case, if an insulating material is interposed between the battery modules, compression may occur in the insulating material, and thus the heat blocking ability may be lower than that of the original insulating material. However, the battery pack according to the present invention has a structure in which a compression preventing member capable of preventing the compression of the insulating material from the swelling pressure of the battery module is applied between the battery modules together with the insulating material, so that the thermal runaway propagation between the battery modules is stably can be blocked.
[29]
Accordingly, according to this aspect of the present invention, the safety of the battery pack can be further improved.
[30]
Effects of the present invention are not limited to the above-described effects, and effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the present specification and accompanying drawings.
Brief description of the drawing
[31]
1 is a view schematically illustrating a battery pack in which an insulating material and a compression prevention body are applied between battery modules according to an embodiment of the present invention.
[32]
FIG. 2 is a diagram illustrating an arrangement structure for preventing thermal diffusion of the battery modules of FIG. 1 .
[33]
3 is an exploded perspective view of an insulating material, a compression prevention body, and a thermally conductive sheet according to an embodiment of the present invention.
[34]
4 is a perspective view illustrating an assembly configuration of a module housing, an insulating material, a compression prevention body, and a thermally conductive sheet of a battery module according to an embodiment of the present invention.
[35]
FIG. 5 is a cross-sectional view taken along line A-A' of FIG. 4 .
[36]
6 is a view for explaining a structure for insulating and dissipating heat between battery modules of a battery pack according to an embodiment of the present invention.
[37]
FIG. 7 is an enlarged view of a main part of FIG. 6 .
Modes for carrying out the invention
[38]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention.Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that there may be equivalents and variations.
[39]
1 is a diagram schematically showing a battery pack in which an insulating material and a compression prevention body are applied between battery modules according to an embodiment of the present invention, and FIG. 2 is an arrangement structure for preventing thermal diffusion between the battery modules of FIG. 1 It is a drawing to show.
[40]
Referring to these drawings, the battery pack according to an embodiment of the present invention includes a plurality of battery modules 100 , a thermal insulator 200 , a compression prevention body 300 , thermally conductive sheets 410 and 420 , and a pack case 500 . ) may be included.
[41]
The battery module 100 may include a plurality of battery cells 110 . The battery cell 110 applied to this embodiment is a secondary battery of a pouch type secondary battery, but the battery module 100 is not necessarily configured as a pouch type secondary battery. That is, the battery module 100 may be configured as a cylindrical or prismatic secondary battery.
[42]
The secondary battery may include an electrode assembly, an electrolyte, and a packaging material. Here, the electrode assembly is an assembly of an electrode and a separator, and may be configured in a form in which one or more positive electrode plates and one or more negative electrode plates are disposed with a separator interposed therebetween. In addition, each electrode plate of the electrode assembly may be provided with an electrode tab to be connected to an electrode lead. In particular, in the case of a pouch-type secondary battery, one or more electrode tabs may be connected to the electrode lead, and the electrode lead may function as an electrode terminal by being interposed between the pouch case materials and exposing one end to the outside. The exterior material may have an empty space therein to accommodate the electrode assembly and the electrolyte, and may be configured in a sealed form. The exterior material may be formed of a metal material in the case of a can-type secondary battery, and may be configured in a form including an external insulating layer, a metal layer, and an internal adhesive layer in the case of a pouch-type secondary battery.
[43]
The configuration of such a secondary battery is obvious to those skilled in the art to which the present invention pertains, and thus a more detailed description thereof will be omitted. In addition, various secondary batteries known at the time of filing of the present invention may be employed in the battery pack according to the present invention.
[44]
The battery module 100 may include a module housing 120 to accommodate the battery cells 110 . That is, it can be said that the module housing 120 constitutes the outer or outer surfaces of the battery module 100 , and a plurality of battery cells 110 may be accommodated in the module housing 120 .
[45]
In this embodiment, the pouch-type battery cells 110 are stored in the module housing 120 in a stacked form in the left-right direction (±X-axis direction). In this case, the outermost battery cell 110 in the stacking arrangement may be disposed to face a pair of side plates 123 and 124 to be described later. According to such a battery cell accommodation structure, the energy density of each battery module 100 may be maximized.
[46]
The module housing 120 may be formed in a substantially rectangular parallelepiped shape. The module housing 120 includes a top plate 121 and a bottom plate 122 respectively forming an upper portion and a lower portion, and a right side plate 123 and a left side plate 124 forming a right side and a left side, respectively. can do. In addition, the module housing 120 has an open front end and a rear end, and a hollow is formed therein, so that the battery cells 110 are accommodated therein. A front cover 125 covering the front end and a rear cover 126 covering the rear end are provided. It can be configured in the form A module terminal may be provided on at least one of the front cover 125 and the rear cover 126 .
[47]
The module housing 120 may be configured in a sealed form to protect the battery cells 110 housed therein from external physical and chemical factors. For example, as shown in Figure 1, the module housing 120, the upper, lower, left, right, front and rear of the battery cells 110 housed therein are not exposed to the outside, up and down, It may be configured in a form in which both left and right and front and rear are blocked. With such a configuration, the module housing 120 may become a component forming the outside with respect to one battery module 100 , and may become a boundary dividing the outside and the inside of the battery module 100 .
[48]
The module housing 120 may include a rigid material such as metal for securing mechanical rigidity and an electrically insulating material for securing electrical insulation outside and inside the battery module 100 . In addition, the module housing 120 may be made of various other materials or may further include other materials.
[49]
The plurality of battery modules 100 may be accommodated in a pack case 500 including a tray 520 and a pack cover 510 provided to be coupled to each other, as shown in FIG. 1 . Although not shown for convenience of the drawing, a battery management system (BMS), a cooling system, a battery disconnection unit (BDU), an electric wiring cable, and the like may be further accommodated in the pack case 500 .
[50]
The plurality of battery modules 100 may be arranged in a left-right direction (±X-axis direction) in a form in which side surfaces are opposed to each other in the tray 520 . That is, the plurality of battery modules 100 may be arranged in the left and right directions with the right side plate 123 and the left side plate 124 facing each other, respectively.
[51]
The insulator 200 may be interposed between the plurality of battery modules 100 . For example, as shown in FIG. 2 , the insulator 200 may be interposed between two battery modules 100 facing each other in the entire battery module 100 included in the battery pack. That is, when N battery modules 100 are included in the battery pack, and these N battery modules 100 are arranged in the left and right directions, N-1 heat insulating materials 200 are provided between the battery modules 100 . may be interposed each time.
[52]
The heat insulating material 200 may be made of a material having high thermal insulation and heat resistance. For example, a material such as expanded polystyrene or phenolic foam may be used to fabricate the insulating material. Such a heat insulating material may serve to block heat generated in the battery module 100 from leaking out or from flowing into the battery module 100 from the outside.
[53]
Therefore, even if some of the battery modules 100 included in the battery pack generate heat, the propagation of heat to other battery modules 100 around it may be blocked or significantly delayed.
[54]
On the other hand, as the use of the battery pack continues, a swelling phenomenon may occur in the battery cells 110 included in the battery module 100 . Due to the swelling phenomenon of the battery cells 110 , the battery module 100 . part of it may expand. In this case, when the heat insulating material 200 between the battery modules 100 is compressed, the heat blocking ability of the heat insulating material 200 may be significantly reduced. In other words, since the conventional heat insulator 200 has a porous structure that uses the heat insulating properties of air in the pores, when the heat insulator 200 is compressed, the porous structure may be broken and the heat blocking ability may be reduced.
[55]
Accordingly, the battery pack according to the present invention further includes a compression preventing member 300 as a configuration to prevent a portion of the battery module 100 from being expanded and the insulation 200 from being compressed.
[56]
The compression prevention body 300 may be made of a rigid material and penetrate the heat insulating material 200 to contact the outer surfaces of the two battery modules 100 having opposite ends facing each other.
[57]
Specifically, with reference to FIGS. 3 to 5 together with FIG. 2 , an example in which the heat insulating material 200 and the compression prevention body 300 are applied together between the battery modules 100 according to an embodiment of the present invention will be described in detail. decide to do
[58]
Hereinafter, for convenience of explanation, two battery modules 100 facing each other are arbitrarily selected from among the battery modules 100 included in the battery pack, and the left is called the first battery module 100A and the right is called the second It will be referred to as a battery module 100B.
[59]
First, referring to FIGS. 2 to 4 , the insulating material 200 is a first insulating pad ( 210 ) and a second heat insulating pad 220 provided to surround the entire left side plate 124 and at least a portion of the top plate 121 in the second battery module 100B. The first heat insulating pad 210 and the second heat insulating pad 220 may be provided symmetrically to each other.
[60]
The first insulating pad 210 and the second insulating pad 220 are respectively bent at the upper end of the wall portions 210a and 220a formed with an area corresponding to the side plates 123 and 124 and the wall portions 210a and 220a. It may include bent portions 210b and 220b disposed in parallel with the top plate 121 .
[61]
According to the configuration of the wall portions 210a and 220a and the bent portions 210b and 220b, the inflow and outflow of heat through the entire side plates 123 and 124 and the corner areas leading to the side plates 123 and 124 and the top plate 121 are blocked. can be
[62]
Also, the bent portions 210b and 220b may be disposed on the top plate 121 , and the bent portions 210b and 220b may be provided to be thicker than the wall portions 210a and 220a. The bent portions 210b and 220b may act as a cushioning material to protect the battery module 100 from vibration or shock that may be transmitted from the pack cover 510 .
[63]
In addition, the first insulating pad 210 and the second insulating pad 220 are provided with bent portions 210b and 220b on the upper portion, so that they can be interposed between the battery modules 100 .At this time, it is possible to mount the battery module 100 on the upper left portion and the upper right portion, respectively. This is assembled by placing the first insulation pad 210 on the first battery module 100A and the second insulation pad 220 on the second battery module 100B in the assembly process, and then attaching them easily. It also works as an advantage in terms of convenience.
[64]
The wall portion 210a of the first insulation pad 210 and the wall portion 220a of the second insulation pad 220 may include at least one through hole H formed through the wall portion in the thickness direction. For example, as shown in FIG. 3 , three through holes H are provided in the wall portions 210a and 220a, one of which is located in the center of the wall portions 210a and 220a, and the other two are located in the center of the wall portions 210a and 220a. One may be positioned symmetrically on the left and on the right. The positions of the three through holes H may correspond to central regions of the side plates 123 and 124 .
[65]
Three compression preventing members 300 are provided, and each compression preventing member 300 may be inserted to pass through the through holes (H). This compression prevention body 300, when the insulating material 200 is interposed between the first battery module 100A and the second battery module 100B, one end of the first insulating pad 210 from the outside of the first It may contact the right side plate 123 of the battery module 100A and the other end may be disposed outside the second heat insulating pad 220 to contact the left side plate 124 of the second battery module 100B.
[66]
The compression preventing member 300 may be made of a material that is rigid enough to sufficiently withstand the expansion force of the battery module 100 . For example, the compression prevention body 300 may be made of a ceramic fiber material and vacuum-formed in a pipe or tube shape to undergo a curing process.
[67]
Again, referring to FIG. 3 , the anti-compression body 300 of this embodiment includes a first anti-compression body 310 and a second anti-compression body 320 , and the first anti-compression body 310 includes the first anti-compression body 310 . The first insulation pad 210 may be inserted into the wall portion 210a and the second compression preventing member 320 may be inserted into the wall portion 220a of the second insulation pad 220 .
[68]
The first anti-compression body 310 and the second anti-compression body 320 may have an insertion limiting portion P2 and an insertion tube portion P1, respectively, and may be provided in a substantially tube or short tube shape. The insertion limiting portion P2 has a larger diameter than the through-holes H of the wall portions 210a and 220a, and the insertion tube portion P1 has a smaller diameter than the through-holes H of the wall portions 210a and 220a. can be arranged to have.
[69]
The first compression preventing member 310 may be inserted into the through hole H of the first insulating pad 210 from left to right, and the second compression preventing member 320 may be inserted into the through hole H of the first insulating pad 210 . It may be inserted into the through hole (H) from right to left. The inserted tube portion P1 of the first compression prevention body 310 and the insertion tube portion P1 of the second compression prevention body 320 inserted in this way form the first insulation pad 210 and the second insulation pad 220, respectively. through which the ends may contact each other. At this time, an adhesive tape or the like may be attached to an end of any one of the insertion tube portions P1 to prevent it from falling off easily.
[70]
Each of the first heat insulating pad 210 and the second heat insulating pad 220 may be formed to have a periphery of the through hole H recessed by the thickness of the insertion limiting part P2. In this case, when the first compression prevention body 310 and the second compression prevention body 320 are inserted into the first insulation pad 210 and the second insulation pad 220, respectively, the first compression prevention body 310 ) of the insertion limiting part P2 does not protrude from one surface of the first insulating pad 210 and the insertion limiting part P2 of the second compression prevention body 320 is one surface of the second insulating pad 220 . may not protrude from
[71]
When the heat insulating material 200 and the compression preventing member 300 are interposed between the first battery module 100A and the second battery module 100B in this configuration (see FIG. 5 ), the first insulation pad 210 without a step difference ) and the insertion limiting part P2 of the first compression prevention body 310 are in contact with the right side plate 123 of the first battery module 100A and similarly without a step difference of the second insulating pad 220 One surface and the insertion limiting part P2 of the second compression prevention body 320 may contact the left side plate 124 of the second battery module 100B.
[72]
A battery pack according to an embodiment of the present invention includes a first thermally conductive sheet 410 , a second thermally conductive sheet 420 and a first thermally conductive sheet 410 between the first thermal insulation pad 210 and the second thermal insulation pad 220 , and the A third heat insulating pad 230 interposed between the first thermally conductive sheet 410 and the second thermally conductive sheet may be further included.
[73]
That is, referring back to FIG. 3 , between the first heat insulating pad 210 and the second heat insulating pad 220 , in the order from left to right, the first thermally conductive sheet 410 , the third heat insulating pad 230 , and the second A thermally conductive sheet 420 may be further added. The first thermally conductive sheet 410 , the third thermally conductive pad 230 , and the second thermally conductive sheet 420 may also have through holes H for inserting the compression preventing member 300 .
[74]
The third heat insulating pad 230 may be provided in two pieces. The first heat insulating pad 210 , the first thermally conductive sheet 410 , and the third insulating pad 230a of one sheet may be connected to each other with the first compression prevention body 310 to form a set of assemblies, and the second thermal insulation The pad 220 , the second thermally conductive sheet 420 , and the other third heat insulating pad 230b may be connected to the second compression prevention body 320 to form another set of assemblies.
[75]
In this way, two assemblies are made (see FIG. 2 ), one mounted on the right side of the first battery module 100A and the other mounted on the left side of the second battery module 100B, so that the first battery module 100A and the second If the battery module 100B is interposed integrally with the heat insulating materials 200, the compression prevention body 300, and the thermally conductive sheets between the battery modules 100 in a manner that the battery module 100B is in close contact with each other, the assembly operation will be performed efficiently and quickly. can
[76]
On the other hand, the first thermally conductive sheet 410 and the second thermally conductive sheet 420 are for quickly dissipating the heat passing over the first thermal insulation pad 210 or the second thermal insulation pad 220 to the outside. As a component, it may be made of a material such as aluminum or graphite having excellent thermal conductivity.
[77]
3 and 5 to 6 , the first thermally conductive sheet 410 includes a first heat absorbing part 410a in face-to-face contact with the wall part 210a of the first heat insulating pad 210 and the first heat absorbing part. It includes a first heat dissipation part 410b bent from the upper portion of the part 410a and extending in parallel with the bent part 210b of the first heat insulating pad 210 or the top plate 121 of the first battery module 100A. do. The upper surface of the first heat dissipation part 410b may be disposed in contact with the inner surface of the pack cover 510 as shown in FIG. 6 .
[78]
The first thermally conductive sheet 410 may act to quickly disperse the heat source propagating to the right beyond the first insulating pad 210 to the pack cover 510 so as not to move toward the second battery module 100B. have. Here, since the pack cover 510 is a structure having a relatively large thermal capacity compared to the first battery module 100A, the heat of the first thermally conductive sheet 410 may be sufficiently absorbed.
[79]
The second thermally conductive sheet 420 has a second heat absorbing portion 420a in face-to-face contact with the wall portion 220a of the second heat insulation pad 220 and is bent at an upper portion of the second heat absorbing portion 420a to form a second heat insulation and a second heat dissipation part 420b extending in parallel with the bent part 220b of the pad 220 or the top plate 121 of the second battery module 100B. The second heat dissipation unit 420b may be disposed in contact with the inner surface of the pack cover 510 similarly to the first heat dissipation unit 410b.
[80]
The second thermally conductive sheet 420 may act similarly to the first thermally conductive sheet 410 . That is, the heat source propagating to the left beyond the second insulation pad 220 may function to disperse the heat source to the pack cover 510 so that it does not move toward the first battery module 100A.
[81]
In addition, a third thermal insulation pad 230 is interposed between the first thermally conductive sheet 410 and the second thermally conductive sheet 420 , so that the first thermally conductive sheet 410 and the second thermally conductive sheet 420 are interposed. ) can be blocked, and even if the heat source moves in the left or right direction beyond the third heat insulating pad 230 , by the first thermally conductive sheet 410 or the second thermally conductive sheet 420 . Heat can be quickly dissipated by the pack cover 510 .
[82]
Therefore, according to the above configuration, for example, as shown in FIG. 6 , even if a problem occurs in any of the battery cells 110 inside the first battery module 100A, the first battery module 100A is severely heated or a fire occurs, the second battery module With 100B, the movement of the heat source can be blocked more effectively.
[83]
In addition, referring to FIG. 7 , as described above, when the battery cells 110 inside the first battery module 100A to the second battery module 100B swell, the compression prevention body 300 is the first battery module. It acts to support the right side plate 123 of the 100A and the left side plate 124 of the second battery module 100B so that the insulators 200 are not compressed. In this case, the first heat insulating pad 210 , the second heat insulating pad 220 , and the third heat insulating pad 230 can fully exhibit the original heat insulating function, so that, for example, when the first battery module 100A generates heat. Heat may be stably blocked so that the thermal runaway phenomenon does not propagate to the second battery module 100B.
[84]
Meanwhile, the battery pack according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle. That is, the vehicle according to the present invention is a battery according to the present invention.Repack may be included. In particular, in the case of an electric vehicle, a battery pack may include many secondary batteries. According to the present invention, no matter which secondary battery generates heat, the battery module 100 to which the secondary battery belongs to other battery modules ( 100) can effectively block the propagation of thermal runaway.
[85]
In the battery pack having this configuration, when an event such as heat or flame occurs in a specific battery module 100, the thermal runaway phenomenon to the surrounding battery module 100 may be blocked or sufficiently delayed, so that user safety and secondary accidents may occur. The time needed to take action to prevent it can be secured.
[86]
Meanwhile, in this specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are for convenience of explanation only, and may vary depending on the position of the object or the position of the observer. It will be apparent to those skilled in the art that the present invention can.
[87]
As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.
Claims
[Claim 1]
a plurality of battery modules including a plurality of battery cells and a module housing accommodating the plurality of battery cells; an insulating material interposed between two battery modules facing each other in the plurality of battery modules; and a compression preventing member made of a rigid material and disposed in contact with the outer surfaces of the two battery modules having both ends facing each other through the heat insulating material.
[Claim 2]
The module housing according to claim 1, wherein the module housing comprises: a top plate forming an upper portion and a lower portion of the module housing, respectively; and a bottom plate; and a pair of side plates respectively forming a left side and a right side of the module housing, wherein the battery cells are pouch-type battery cells, which are stacked with a wide side upright, and are arranged in a stacked arrangement inside the module housing. The outermost battery cell is accommodated in a form disposed to face the pair of side plates, and the heat insulating material and the compression preventing member are configured to be in contact with each of the side plates of the two battery modules facing each other battery pack.
[Claim 3]
The method according to claim 2, wherein when specifying the two facing battery modules as a first battery module and a second battery module, the insulating material comprises at least one surface of the side plate and at least one of the top plate in the first battery module. a first insulating pad provided to surround a portion; and a second insulation pad provided to surround at least a portion of one side of the side plate and at least a portion of the top plate in the second battery module.
[Claim 4]
The battery pack according to claim 3, wherein the first insulating pad and the second insulating pad are symmetrically provided.
[Claim 5]
5. The method of claim 4, wherein the first insulation pad and the second insulation pad each include a wall portion formed in an area corresponding to the side plate and a bent portion bent at an upper end of the wall portion to be disposed parallel to the top plate. A battery pack, characterized in that.
[Claim 6]
The battery pack according to claim 5, wherein the wall portion includes at least one through hole that is formed through the wall portion in a thickness direction, and the compression preventing member is inserted into the at least one through hole.
[Claim 7]
The method of claim 6, wherein the at least one through-hole is three through-holes, and one of the three through-holes is located in the center of the wall part and the other two are symmetrically located one by one on the left and right sides of the center. A battery pack, characterized in that.
[Claim 8]
The method of claim 6, wherein the anti-compression member includes a first anti-compression member inserted into the wall portion of the first heat insulating pad and a second anti-compression member inserted into the wall portion of the second heat insulation pad. Characterized by the battery pack.
[Claim 9]
9. The method of claim 8, wherein the first compression prevention member and the second compression prevention member each includes: an insertion limiting portion formed with a larger diameter than the through hole; and a tube or tube shape formed with a smaller diameter than the insertion limiting portion and including an insertion tube portion disposed inside the through hole.
[Claim 10]
The method according to claim 9, wherein the insertion limiting part of the first compression prevention body is configured to contact the side plate of the first battery module and the insertion restriction part of the second compression prevention body is configured to contact the side plate of the second battery module. Characterized by the battery pack.
[Claim 11]
The battery pack according to claim 9, wherein the ends of the insertion tube portion of the first compression prevention body and the insertion tube portion of the second compression prevention body are configured to contact each other.
[Claim 12]
The battery pack according to claim 1, wherein the compression preventing member is formed of a ceramic fiber material.
[Claim 13]
5. The method of claim 4, wherein the first thermally conductive sheet and the second thermally conductive sheet are disposed between the first thermally conductive sheet and the second thermally conductive pad, and is interposed between the first thermally conductive sheet and the second thermally conductive sheet. Battery pack, characterized in that it further comprises a third insulating pad.
[Claim 14]
14. The method of claim 13, wherein the first thermally conductive sheet has a first heat dissipation portion provided in a form bent and extended in a direction parallel to the top plate of the first battery module, and the second thermally conductive sheet comprises the second A battery pack comprising: a second heat dissipation unit provided in a form in which an upper portion is bent and extended in a direction parallel to the top plate of the battery module.
[Claim 15]
15. The battery pack of claim 14, further comprising a pack cover for exchanging heat in contact with the first heat dissipation unit and the second heat dissipation unit.
[Claim 16]
A motor vehicle comprising the battery pack according to claim 1 .