Title of invention: Battery pack with degassing flow path
Technical field
[One]
The present invention relates to a battery pack, and more particularly, to a battery pack to which a gas flow path capable of smoothly discharging gas generated from battery cells to the outside is applied.
[2]
This application is an application for claiming priority for Korean Patent Application No. 10-2018-0046302 filed on April 20, 2018, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
Background
[3]
A battery pack applied to an electric vehicle or the like includes a plurality of secondary battery cells connected in series and/or in parallel to obtain high output. Each of the secondary battery cells may be repeatedly charged and discharged by an electrochemical reaction between components, including a positive electrode and a negative electrode current collector, a separator, an active material, and an electrolyte.
[4]
Secondary battery cells can generally be classified into a can-type secondary battery in which an electrode assembly is embedded in a metal can and a pouch-type secondary battery in which the electrode assembly is embedded in an aluminum laminate sheet according to their shape. Pouch-type secondary batteries are lighter than can-type secondary batteries, have less possibility of electrolyte leakage, and have flexibility in shape, so that they can implement secondary batteries of the same capacity with a smaller volume and mass. It is preferred as a secondary battery cell of the battery pack of
[5]
The pouch-type secondary battery is charged or discharged by an electrochemical reaction. If heat accompanying the charging/discharging process is not effectively removed, the internal temperature of the secondary battery may rapidly increase. The rapid increase in temperature causes a decomposition reaction of the electrolyte solution to generate gas inside the secondary battery.
[6]
On the other hand, in the case of an electric vehicle, when gas exuded from the secondary battery is filled in the inner space of the battery pack, the pressure of the inner space of the battery pack increases. When the internal pressure of the battery pack increases rapidly, the pack case may be deformed and the normal operation of other secondary batteries may be disturbed. Therefore, the gas must be quickly discharged to the outside of the battery pack. To this end, a conventional battery pack, as disclosed in Korean Patent Laid-Open No. 10-2016-0112768, is equipped with a gas outlet for discharging internal gas to the outside.
[7]
However, recently, an industry that produces battery packs for electric vehicles has made a pack case slim, and is manufacturing battery packs to maximize energy density by very intensively storing secondary battery cells in such pack cases.
[8]
In such a compact battery pack structure, when gas is generated far from the gas outlet of the pack case, the gas movement path to the gas outlet is blocked or very narrow. In this case, since the gas cannot be quickly discharged to the outside, there is a disadvantage in that stability is deteriorated due to an increase in the internal pressure of the battery pack. Therefore, there is a need for a method capable of maximizing energy density and enabling rapid gas discharge.
Detailed description of the invention
Technical challenge
[9]
Accordingly, the present invention is invented to solve the above problems, and since secondary battery cells are intensively stored, the energy density is high, and a flow path for rapidly discharging gas along the intended path is applied, so safety It is an object to provide this secured battery pack.
[10]
Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.
Means of solving the task
[11]
According to the present invention, a battery including a pack case housing the cell module assembly in an inner space and having an opening at one side, a pack cover having a degassing port communicating with the inner space and covering an opening of the pack case As a pack,
[12]
The cell module assembly may include a cell stack composed of secondary battery cells; And a frame for fixing a cell having an upper plate and a lower plate disposed respectively on the upper and lower portions of the cell stacked body and respectively facing and contacting the upper and lower walls of the pack case, and at least one of the upper and lower plates, At least one gas movement route formed by concave at least one region of one surface disposed to face the upper wall or the lower wall of the corresponding pack case along a predetermined path toward the degassing port; And at least one through hole formed vertically through the gas movement route, and the at least one through hole is in a vertical upper or vertical lower part of a gas pocket part, which is a space in which gas exuded from at least one side of the cell stack is collected. The formed battery pack may be provided.
[13]
The secondary battery cell is a pouch-type secondary battery cell, and the gas pocket portion may be provided in a region in which terrace portions of the secondary battery cells disposed farthest from the degassing port are arranged in a layered manner.
[14]
The at least one gas movement route may have a straight path toward the pack cover from the corresponding through holes.
[15]
An adhesive resin interposed between both side surfaces of the cell stack and both side walls of the pack case may further include an adhesive resin for fixing the cell stack to the pack case.
[16]
The cell fixing frame further includes a cell guide disposed vertically on both side surfaces of the cell stack and formed in a concave-convex structure so that side wings of the secondary battery cells are disposed, and both side walls of the pack case And the cell guide may include at least one resin hole through which the adhesive resin passes in and out of each predetermined position.
[17]
The frame for fixing the cell may further include a vertical plate vertically coupled to the rear end of the upper plate and the lower plate.
[18]
A plurality of bus bars disposed on at least one side of the cell stack in which electrode leads of the secondary battery cells are located and electrically connected to the electrode leads; And a bus bar assembly in which the plurality of bus bars are installed in the inner region in the shape of a square frame, and are detachably coupled to an end of the frame for fixing the cell.
[19]
The pack cover may be provided with an electric equipment mounting portion capable of accommodating electric equipment on the inner surface of the pack cover by protruding convexly outward to correspond to the shape of the electric equipment.
[20]
Between the pack cover and the cell module assembly, a BMS assembly may be further provided to be detachably coupled to the pack cover and the cell module assembly.
[21]
According to another aspect of the present invention, an electric vehicle including the above-described battery pack may be provided.
Effects of the Invention
[22]
According to an aspect of the present invention, it is possible to increase energy density by intensively storing secondary battery cells in the inner space of the pack case, and to quickly discharge the gas generated from the secondary battery cells to the outside of the battery pack along an intended path. As a result, safety can be secured by preventing an increase in the internal pressure of the battery pack.
[23]
In addition, according to another aspect of the present invention, it is possible to minimize the volume of the battery pack by integrally fixing the secondary battery cells by using a frame for fixing the cells and securing a gas movement route.
Brief description of the drawing
[24]
1 is a perspective view of a battery pack according to an embodiment of the present invention.
[25]
2 is a perspective view of the battery pack of FIG. 1 in which the pack case is separated.
[26]
3 is a perspective view of an inner portion of the pack cover of FIG. 1.
[27]
4 is a perspective view illustrating a BMS assembly coupled to the pack cover of FIG. 3.
[28]
5 is a perspective view schematically showing a state in which a cell module assembly is accommodated in an inner space of a pack case according to an embodiment of the present invention.
[29]
6 is an enlarged view of a gas pocket portion region of FIG. 5.
[30]
7 is a schematic cross-sectional view of a battery pack for explaining a gas discharge path according to an embodiment of the present invention.
Mode for carrying out the invention
[31]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to describe their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention.
[32]
Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, and thus various It should be understood that there may be equivalents and variations.
[33]
1 is a perspective view of a battery pack according to an exemplary embodiment of the present invention, and FIG. 2 is a perspective view of the battery pack of FIG. 1 in which the pack case is separated.
[34]
Referring to these drawings, a battery pack 10 according to an embodiment of the present invention includes a pack case 100, a pack cover 200, and a cell module assembly 300.
[35]
The pack case 100 is a component that accommodates the cell module assembly 300 in an internal space to protect them, provides mechanical support to the cell module assembly 300, and protects the cell module assembly 300 from external impacts. do. Since the pack case 100 must be sufficiently rigid, it may be desirable to be made of a metal such as steel or a metal alloy.
[36]
The pack case 100 according to the present embodiment may be provided in a substantially rectangular parallelepiped box shape having an opening 140 at one side, as shown in FIG. 2. The cell module assembly 300 may be inserted and disposed in the inner space of the pack case 100 through the opening 140. In addition, the pack case 100 includes at least one resin hole H at each predetermined position of both side walls 130. When the cell module assembly 300 is inserted and disposed in the inner space of the pack case 100, an adhesive resin is injected into the pack case 100 through the resin hole H, and the cell module assembly 300 May be fixed to both sidewalls 130 of the pack case 100.
[37]
That is, the adhesive resin may be filled in a space between both side surfaces of the cell stack 310 and both side walls 130 of the pack case 100, although not shown for convenience of drawing. The adhesive resin may be used as a heat exchange medium between the secondary battery cells 311 and the pack case 100 as well as fixing the cell module assembly 300.
[38]
The pack case 100 may be composed of a mono frame and a rear cover. In the mono frame, the thickness of the upper wall 110 and the lower wall 120 is the same, the thickness of both side walls 130 are the same, and it can be said to be a structure manufactured in the shape of a hollow square tube. One of the openings of the mono frame may be shielded by a plate-shaped rear cover. Of course, the pack case 100 may be manufactured such that the mono frame and the rear cover are integrally formed.
[39]
The pack cover 200 may be mounted on the pack case 100 so as to have a degassing port 210 and cover an opening of the pack case 100. The degassing port 210 is provided to communicate with the inner space of the pack case 100 as a means for discharging gas generated inside the battery pack 10 to the outside.
[40]
In addition, the pack cover 200 has a positive terminal terminal and a negative terminal terminal on the outside, and a space in which electrical equipment such as a BDU (Battery Disconnect Unit), which is a device for blocking the flow of high current in case of emergency, can be assembled inside. It may be provided with an electrical equipment mounting portion 220.
[41]
For example, as shown in FIGS. 3 to 4, the electrical equipment mounting portion 220 may be formed on an inner surface by forming a central portion of the pack cover 200 to protrude outward. The electric equipment mounting part 220 may be formed to be shaped to fit the shape of the electric equipment to be mounted at a corresponding position.
[42]
In addition, a BMS assembly 400 may be further coupled to the pack cover 200 as shown in FIG. 4. The BMS assembly 400 may be composed of a BMS circuit board on which a BMS chip and a current sensor 410 (shunt resistor) are mounted, and a BMS housing supporting the BMS circuit board, and the BMS housing is a pack cover 200 ) Is detachably assembled in a snap-fit ​​method along the circumference of the inner side and fixedly coupled to the pack cover 200 integrally.
[43]
The BMS assembly 400 may be assembled to be electrically and structurally connected to the front end of the cell module assembly 300 (in the direction of the electrode lead 311a) while being fixed to the pack cover 200 as described above. The positive and negative terminals of the pack cover 200, the BMS circuit board of the BMS assembly and the secondary battery cells 311 of the cell module assembly 300 may be electrically connected to each other by components such as busbars, cables, connectors, etc. , This can be said to be obvious to those skilled in the art, so a detailed description will be omitted.
[44]
On the other hand, the cell module assembly 300 is configured to include a cell stack 310, a bus bar assembly 320, a frame for fixing the cell 330, as shown in Figure 5, the pack case 100 It can be inserted and arranged tightly in the interior space. That is, the width and height of the cell module assembly 300 substantially coincide with the width and height of the inner space of the pack case 100.
[45]
The cell stack 310, which is a major component of the cell module assembly 300, may be referred to as an assembly of secondary battery cells 311 arranged stacked and arranged. Here, the secondary battery cell 311 is a pouch-type secondary battery. Each pouch type secondary battery includes an electrode assembly, a pouch case for accommodating the electrode assembly, and an electrode lead 311a connected to the electrode assembly and partially protruding outside the pouch case.
[46]
The pouch exterior material is composed of an upper pouch and a lower pouch, and the upper pouch and the lower pouch have edges adhered to each other to accommodate the electrode assembly in the inner space. The edge of the pouch exterior material sealed in this way will be defined as a terrace 312. The shape of the pouch-type secondary battery may be variously determined according to the shape of the electrode assembly, but in general, the pouch-type secondary battery can be manufactured in an approximately rectangular shape.
[47]
The terrace 312 of such a pouch-type secondary battery may be divided into a short side terrace 312 and a long side terrace 312 according to its position. In particular, the long side terrace 312 corresponds to the side of the pouch-type secondary battery and is also referred to as a side wing.
[48]
The bus bar assembly 320 includes a plurality of bus bars 321, a printed circuit board 322 connected to each bus bar 321, and a bus bar housing 323 supporting them.
[49]
The electrode leads 311a of the secondary battery cells 311 may be attached to the surface of the plurality of bus bars 321 in the shape of a metal rod. That is, the electrode leads 311a of the secondary battery cells 311 may be electrically connected to each other by welding their ends to the corresponding bus bar 321, for example.
[50]
One end of the plurality of bus bars 321 may be connected to the printed circuit board 322. The printed circuit board 322 is used to sense the voltage characteristics of the secondary battery cells 311 through each of the bus bars 321 and to transmit voltage information to the BMS connected by a cable connector.
[51]
The bus bar housing 323 is a configuration that serves as a frame providing a place in which the plurality of bus bars 321 and the printed circuit board 322 can be mounted.
[52]
The bus bar housing 323 of this embodiment has a rectangular frame shape, and the plurality of bus bars and the printed circuit board 322 are installed in the inner region, and the circumferential portion is detachably attached to the front end of the frame 330 for fixing the cell. It is provided to be fitted and joined. Hook locking holes may be provided on the side of the busbar housing 323 as a detachable coupling means. Of course, unlike the present embodiment, it is possible to provide hooking holes in the cell fixing frame 330 and to provide hooks on the side surfaces of the bus bar housing 323.
[53]
The cell fixing frame 330 is a top plate that is disposed above and below the cell stack 310 with respect to the stacking direction of the secondary battery cells 311 to support the upper and lower portions of the cell stack 310, respectively. It may include a vertical plate 333 vertically connecting the rear ends of the upper plate 331 and the lower plate 332 and the upper plate 331 and the lower plate 332. Here, the rear ends of the upper plate 331 and the lower plate 332 refer to the ends of the upper plate 331 and the lower plate 332 located in a direction opposite to the opening 140 of the pack case 100.
[54]
When the cell module assembly 300 is inserted into the inner space of the pack case 100 as shown in FIG. 5, the upper plate 331 and the lower plate 332 of the cell fixing frame 330 are formed on the upper wall of the pack case 100. It is in close contact with each of the 110 and the lower wall 120. That is, the height including the upper plate 331 and the lower plate 332 and the cell stack 310 may be predetermined as a dimension corresponding to the inner space of the pack case 100.
[55]
In addition, the cell fixing frame 330 may further include a cell guide 334 disposed vertically on both side surfaces of the cell stack 310 and having a plate surface formed in an uneven structure.
[56]
By the cell guide 334, the secondary battery cells 311 are surrounded by the upper plate 331, the lower plate 332, the vertical plate 333, and the cell guide 334 in a state where the top and bottom are fixed in a slide manner. Can be placed one by one in the space. In other words, the cell stack 310 may be formed by inserting the secondary battery cells 311 into the cell fixing frame 330 one by one in a slide manner. In this case, since both side portions of the secondary battery cells 311 are guided by the cell guide 334, they can be correctly stacked at a predetermined position.
[57]
The cell guide 334 may further include at least one resin hole H through which the adhesive resin passes in and out of each predetermined position. As described above, the adhesive resin may be injected into the pack case 100 through the resin holes H of both side walls 130 of the pack case 100. At this time, a part of the adhesive resin injected into the pack case 100 may permeate between the cell guide 334 and the side wall 130 of the pack case 100, and the remaining part is the resin of the cell guide 334 The space between the secondary battery cells 311 and the cell guide 334 may be penetrated through the hole H. Accordingly, the secondary battery cells 311, the cell guide 334, and the sidewall 130 of the pack case 100 may be fixedly coupled to each other by an adhesive resin (not shown).
[58]
The cell guide 334 may be made of a material having excellent thermal conductivity, such as aluminum or an aluminum alloy. In this case, heat of the secondary battery cells 311 accompanying the charging and discharging process may be rapidly discharged to the outside through the cell guide 334 and the adhesive resin.
[59]
According to this embodiment, since the cell stack 310 is pressed by the upper plate 331 and the lower plate 332 of the cell fixing frame 330 and both side portions are fixed by the adhesive resin, vibration However, reliability of the electrical connection of the secondary battery cells 311 may be ensured even during an external impact. In addition, since the number of parts for fixing the cell stack 310 is reduced, energy density and assembly properties may be improved.
[60]
On the other hand, when the secondary battery cell 311 generates gas in the secondary battery cell 311 due to an electrolyte decomposition reaction during charging and discharging, the swelling phenomenon becomes severe. Gas can seep out.
[61]
In the case of the present embodiment, since both sides of the secondary battery cells 311 and both side walls 130 of the pack case 100 are filled with adhesive resin, it is difficult for gas to leak out to both sides of the secondary battery cells 311. , Gas may leak through portions of the terrace 312 on the short side of the secondary battery cells 311 not filled with adhesive resin.
[62]
The battery pack 10 according to the present invention is a gas provided on the upper plate 331 and the lower plate 332 of the frame 330 for fixing cells in order to quickly discharge these gases to the outside through the intended path within the battery pack 10 It includes a moving route 335 and a through hole 336.
[63]
For example, as shown in FIGS. 5 to 7, at least one of the upper plate 331 and the lower plate 332 of the cell fixing frame 330 is the upper wall 110 of the corresponding pack case 100 or At least one gas movement route 335 formed by concave at least one area of ​​one surface disposed facing the lower wall 120 along a predetermined path toward the degassing port 210, and the gas movement route It includes at least one through hole 336 formed by penetrating the plate surface up and down on the 335.
[64]
As described above, when the cell module assembly 300 is inserted into the inner space of the pack case 100, for example, the upper plate 331 of the cell fixing frame 330 faces the upper wall 110 of the pack case 100 Thus, the portion of the gas movement route 335 covered by the upper wall 110 of the pack case 100 may be a passage through which the flow of gas can be induced.
[65]
The gas generated in the cell stack 310 is guided to the gas movement route 335 through at least one through hole 336 formed in the upper plate 331 and the lower plate 332 of the cell fixing frame, and thus a degassing port ( 210) can flow in the direction.
[66]
In the case of a pouch-type secondary battery cell, it is generally a square plate shape in which the edge portion is sealed, and gas seeps out from the edge portion. Taking this into account, at least one through hole 336 of the present embodiment is provided in the corner area of ​​the upper plate 331 and the lower plate 332 so as to be located at the closest position to the position where gas can seep out of the cell stack 310. .
[67]
Here, the corner regions of the upper plate 331 and the lower plate 332 may be specified as regions corresponding to the edge regions of the cell stack 310, and in this case, the at least one through hole 336 is a layered secondary battery It is located in the vertical upper or vertical lower portion of the terrace 312 on the short side of the cells 311.
[68]
Since the portion of the terrace 312 on the short side of the secondary battery cells 311 is thinner than other portions, there are many empty spaces above and below the secondary battery cells 311. Accordingly, gas generated inside the secondary battery cells 311 may seep from the terrace 312 of the secondary battery cells 311 and be collected in the empty space. As described above, the empty space in which the gas exuded from at least one side of the secondary battery cells 311 forming the cell stack 310 is collected will be designated as the gas pocket part 337.
[69]
In the prior art, it is common to reduce the size by folding a portion of the terrace 312 without the electrode lead 311a in the secondary battery cell 311, but in the present invention, the terrace 312 on the short side of the secondary battery cells 311 By leaving the cells without folding, a gas pocket portion 337 is provided between the upper plate 331 and the lower plate 332 and the vertical plate 333 of the cell fixing frame, and the gas pocket portion 337 is provided in a space where gas can flow in the vertical direction. Use.
[70]
The gas pocket portion 337 according to this embodiment is provided in a layered arrangement of the terrace 312 of secondary battery cells located farthest from the degassing port 210, as shown in FIGS. 5 and 6 Can be.
[71]
A plurality of the at least one through hole 336 according to the present exemplary embodiment may be provided, and may be located one at a corner area of ​​the upper plate 331 and the lower plate 332 corresponding to the gas pocket portion 337. In other words, the through-holes 336 are provided with two in the upper plate 331 and two in the lower plate 332, for a total of four.
[72]
And at least one gas movement route 335, from the corresponding through holes 336 along the longitudinal direction of the upper plate 331 and the lower plate 332 toward the pack cover 200 having a degassing port 210 It has a straight path, and a total of four are provided, one on each side of the upper plate 331 and the lower plate 332.
[73]
In this way, the gas movement route 335 is provided on both sides of the upper plate 331 and the lower plate 332 to guide the flow of gas to both sides, so that the structure on the side of the pack cover 200 (for example, the bus bar assembly 320) Alternatively, interference with the BMS assembly 400 may be avoided.
[74]
In other words, in the BMS assembly 400 or the bus bar assembly 320, parts that interfere with the flow of gas such as the bus bar 321 and the printed circuit board 322 are concentrated in the center area, whereas the two side portions are As a shape fitting part for mutual snap-fit ​​assembly, there are more gaps through which gas can pass than in the middle part. Therefore, it may be advantageous for gas flow to have the gas movement route 335 on both sides.
[75]
In addition, the bus bar housing 323, which is directly snap-fitted to the upper plate 331 and the lower plate 332 of the cell fixing frame 330, is stepped lower than the center of both side portions, referring to FIG. It can take shape. The stepped side portion may be in direct communication with the gas movement route 335.
[76]
With reference to FIGS. 6 and 7 together, the gas discharge path of the battery pack 10 according to an embodiment of the present invention is briefly summarized as follows.
[77]
Both side wings (long side terrace 312) of the secondary battery cells 311 face the cell guide 334 and the side wall 130 of the pack case 100, and the space between them is an adhesive resin (not shown). ), so gas cannot seep out or move. On the other hand, the two terraces 312 on the short side except for the side wing portions of the secondary battery cells 311 are not blocked, so that gas may seep out of the secondary battery cells 311.
[78]
First, the gas that seeps out of the terrace 312 on the short side of the secondary battery cells 311 where the electrode lead 311a is located is adjacent to the degassing port 210 and is not completely blocked. It may be discharged to the outside of the battery pack 10 through the gassing port 210.
[79]
Then, the gas that seeps out of the terrace 312 on the other short side (furthest from the degassing port 210) of the secondary battery cells 311 is collected in the gas pocket 327, and the gas pocket ( Through the through holes 336 located at the upper and lower portions of 327), it may be diffused to the gas movement route of the upper plate and the lower plate of the cell fixing frame. And, like the gas flow line indicated by the arrow in FIG. 7, the flow of gas is guided toward the pack cover 200 and discharged to the outside of the battery pack 10 through the degassing port 210.
[80]
According to the configuration of the present invention, since the secondary battery cells 311 are intensively stored in the inner space of the pack case 100, the energy density of the battery pack 10 is very high, and the gas in the secondary battery cells 311 Even if occurs, the gas may be quickly discharged to the outside of the battery pack 10 along an intended path, thereby preventing an explosion risk due to an increase in the internal pressure of the battery pack 10.
[81]
For reference, the battery pack 10 according to the present embodiment is a battery pack 10 constructed using unidirectional pouch-type secondary battery cells 311, but the scope of the present invention is a unidirectional pouch-type secondary battery cell 311 It does not have to be limited to the battery pack 10 to which they are applied. That is, even a battery pack composed of bi-directional pouch-type secondary battery cells 311 in which the positive and negative leads are located in opposite directions, the terrace 312 of the secondary battery cells 311 located farthest from the degassing port 210 ) The gas generated in the part is a degassing port by the gas movement route 335 and the through hole 336 of the upper plate 331 and the lower plate 332 of the cell fixing frame 330 as in this embodiment. Can be derived to (210).
[82]
In addition, the battery pack according to the present embodiment uses pouch-type secondary battery cells, but the scope of the present invention is not limited thereto. As an alternative to the pouch-type secondary battery cells, rectangular or cylindrical secondary battery cells may be applied. For example, prismatic or cylindrical secondary battery cells may form a laminate in one or two or more stages. The upper plate 331 and the lower plate 332 of the cell fixing frame are respectively disposed on the upper and lower portions of the cell stack to support the upper and lower portions of the cell stack composed of the square or cylindrical secondary battery cells, respectively, and a pack case ( It may be inserted into the pack case 100 in close contact with the upper wall 110 and the lower wall 120 of 100). In this case, even if a battery pack using square or cylindrical secondary battery cells, as in the above-described embodiment, the upper plate 331 / lower plate 332 of the cell fixing frame and the upper wall 110 / lower wall 120 of the pack case A gas discharge path may be formed in a contact area.
[83]
Meanwhile, the battery pack according to the present invention can be applied to a vehicle such as an electric vehicle or a hybrid vehicle. That is, the vehicle according to the present invention may include one or more battery packs according to the present invention.
[84]
As described above, although the present invention has been described by 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. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.
[85]
On the other hand, when terms indicating directions such as up, down, left, right, before, and after are used in this specification, these terms are for convenience of description only, and depending on the location of the object or the observer It will be apparent to those skilled in the art that may vary.
Claims
[Claim 1]
A battery pack including a pack case housing the cell module assembly in an inner space and having an opening at one side, a pack cover having a degassing port communicating with the inner space and covering an opening of the pack case, wherein the cell The module assembly includes a cell stack composed of secondary battery cells; And a frame for fixing a cell having an upper plate and a lower plate disposed respectively on the upper and lower portions of the cell stacked body and respectively facing and contacting the upper and lower walls of the pack case, and at least one of the upper and lower plates, At least one gas movement route formed by concave at least one region of one surface disposed to face the upper wall or the lower wall of the corresponding pack case along a predetermined path toward the degassing port; And at least one through hole formed vertically through the gas movement route, wherein the at least one through hole is in a vertical upper or vertical lower portion of a gas pocket portion, which is a space in which gas exuded from at least one side of the cell stack is collected. Battery pack, characterized in that formed.
[Claim 2]
The method of claim 1, wherein the secondary battery cell is a pouch-type secondary battery cell, and the gas pocket portion is provided in an area in which terrace portions of the secondary battery cells disposed farthest from the degassing port are arranged in a layered manner. Battery pack.
[Claim 3]
The battery pack according to claim 1, wherein the at least one gas movement route has a straight path from the corresponding through holes toward the pack cover.
[Claim 4]
The battery pack according to claim 2, further comprising an adhesive resin interposed between both side surfaces of the cell stack and both side walls of the pack case to fix the cell stack to the pack case. .
[Claim 5]
The method of claim 4, wherein the cell fixing frame further comprises a cell guide disposed vertically on both side surfaces of the cell stack and formed in a concave-convex structure such that side wings of the secondary battery cells are disposed, The battery pack, wherein both sidewalls of the pack case and the cell guide have at least one resin hole through which the adhesive resin passes in and out of each predetermined position.
[Claim 6]
The battery pack according to claim 1, wherein the cell fixing frame further comprises a vertical plate vertically coupled to a rear end of the upper plate and the lower plate.
[Claim 7]
The apparatus of claim 2, further comprising: a plurality of bus bars disposed on at least one side of the cell stack in which electrode leads of the secondary battery cells are located and electrically connected to the electrode leads; And a bus bar assembly having a bus bar housing provided to be detachably coupled to an end portion of the cell fixing frame, wherein the plurality of bus bars are installed in an inner region in the shape of a square frame.
[Claim 8]
The battery pack according to claim 1, wherein the pack cover is provided with an electric equipment mounting portion capable of accommodating electric equipment on the inner surface by protruding convexly outward so as to correspond to the shape of the electric equipment.
[Claim 9]
The battery pack of claim 1, further comprising a BMS assembly provided to be detachably coupled to the pack cover and the cell module assembly between the pack cover and the cell module assembly.
[Claim 10]
A vehicle comprising the battery pack according to any one of claims 1 to 9.