KR20240031099A - Battery pack and device including the same - Google Patents

Abstract

A battery pack according to an embodiment of the present invention includes a plurality of cell units each including at least one battery cell, a cell cover that surrounds and supports the at least one battery cell, and the plurality of cell units in an internal space. It includes a pack case for receiving and supporting the cell cover, the cell cover comprising: a first cover part covering one side of the at least one battery cell, a second cover part covering the other side of the at least one battery cell, and A cap portion connects the first cover portion and the second cover portion and covers an upper portion of the at least one battery cell, and the cap portion is detachably coupled to the first cover portion and the second cover portion. there is.

Description

Battery pack and device including the same {BATTERY PACK AND DEVICE INCLUDING THE SAME}

The present invention relates to a battery pack and a device containing the same, and more specifically, to a battery pack and a device containing the same that improve energy density, are easy to handle and install, and have enhanced safety.

Generally, secondary batteries refer to batteries that can be repeatedly charged and discharged, such as lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, and nickel zinc batteries.

Recently, secondary batteries have been applied to devices that require high output voltage and large charging capacity, such as electric vehicles or ESS (Energy Storage Systems), and multiple battery cells are connected in series or parallel to form a battery module. Battery packs, which are manufactured by forming a battery module and connecting a plurality of battery modules thus configured in series or parallel, are widely used.

However, as disclosed in prior documents 1 and 2, the existing technology constructs a battery module by accommodating battery cells in a box-shaped metal case, and then accommodates these battery modules in the battery pack case to manufacture the battery pack. Therefore, there is a problem of increasing the weight and volume of the entire battery pack and reducing the energy density of the battery pack.

In addition, in order to increase the energy density of the battery pack, when the existing Cell To Pack method of installing multiple battery cells directly into the pack case of the battery pack is applied to a pouch-type battery cell with a soft case, many It is difficult to handle or stack battery cells at the same time, and there is a risk of damage to the battery cells in the process of mounting them in the pack case.

Moreover, the existing cell-to-pack method places multiple battery cells space-intensively densely packed inside the pack case, making it difficult to discharge gases or flames generated during thermal runaway of battery cells in the intended direction. , there is a problem that when thermal runaway occurs in some battery cells, it causes serial thermal runaway in the remaining battery cells.

Prior Document 1: Korean Patent Publication No. 10-2379227,

Prior Document 2: Korean Patent Publication No. 10-2022-0052183

The problem to be solved by the present invention is to reduce the overall weight and volume, increase energy density, facilitate the handling and installation of battery cells built into the battery pack, and prevent gases or flames generated during thermal runaway of the battery cells. The aim is to provide a battery pack and a device containing the same that can prevent chain thermal runaway by discharging in the intended direction.

However, the problems to be solved by the embodiments of the present invention are not limited to the above-mentioned problems, and other problems not described may be expanded to the extent that they can be clearly understood by those skilled in the art from the description of the present invention.

A battery pack according to an embodiment of the present invention includes a plurality of cell units each including at least one battery cell, a cell cover that surrounds and supports the at least one battery cell, and accommodating the plurality of cell units in an internal space. and a pack case supporting the cell cover, wherein the cell cover includes a first cover part covering one side of the at least one battery cell, a second cover part covering the other side of the at least one battery cell, and the It includes a cap portion that connects the first cover portion and the second cover portion and covers an upper portion of the at least one battery cell, and the cap portion is detachably coupled to the first cover portion and the second cover portion. .

The cap part may be coupled to the first cover part and the second cover part in a snap fit method or a fitting method.

Each of the first cover part and the second cover part is provided with a first fastening groove and a second fastening groove at an upper end adjacent to the cap part, and the cap part is snap-fitted or inserted into the first fastening groove. It may include a first fastening protrusion fastened to the second fastening groove using a snap-fitting method or a fitting method.

The first fastening groove and the second fastening groove may be configured so that the upper ends of the first cover part and the second cover part are curved inwardly of the cell cover where the at least one battery cell is located. there is.

The first fastening protrusion may be formed by bending one end of the tab portion adjacent to the first cover portion, and the second fastening protrusion may be formed by bending the other end of the tab portion adjacent to the second cover portion. there is.

The first cover part and the second cover part may further include a blocking part supporting a lower part of the at least one battery cell at a lower end opposite to the upper end.

The blocking portion may be formed to extend from the lower portions of the first and second cover portions in an inner direction of the cell cover.

The blocking portion may include a locking structure formed by bending the lower portions of the first and second cover portions toward the inside of the cell cover.

The blocking portion may include a bent structure that is bent from the lower end of the first and second cover portions toward the cap portion and then bent roundly toward the opposite side of the cap portion.

The blocking portion may include at least one insertion groove formed by partially removing the blocking portion in the longitudinal direction of the cell cover.

The cell cover may include stainless steel (SUS).

A device according to an embodiment of the present invention includes the at least one battery pack.

According to the present invention, while reducing the overall weight and volume and increasing energy density, it is easy to handle and install the battery cells built into the battery pack, and it is possible to direct gases or flames generated during thermal runaway of the battery cells in the intended direction. A battery pack that can prevent chain thermal runaway by discharging and a device including the same can be provided.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram showing a battery pack according to an embodiment of the present invention.
Figure 2 is a perspective view showing a cell unit of a battery pack according to an embodiment of the present invention.
FIG. 3 is an exploded perspective view showing the cell unit shown in FIG. 2.
Figure 4 is a cross-sectional view showing the cell cover shown in Figure 3.
Figure 5 is a perspective view showing a cell cover according to a modified example.
Figure 6 is a cross-sectional view showing the cell cover shown in Figure 5.
Figure 7 is a cross-sectional view showing a cell cover according to another modified example.
Figure 8 is a diagram showing a device according to another embodiment of the present invention.

Hereinafter, with reference to the attached drawings, various embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms other than those described below, and the scope of the present invention is not limited by the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are given the same reference numerals throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily enlarged or reduced for convenience of explanation, it is obvious that the content of the present invention is not limited to what is shown. In the drawings below, the thickness of each layer is enlarged to clearly express the various layers and regions. In the drawings below, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

Additionally, when a part of a layer, membrane, area, plate, etc. is described as being “on” or “on” another part, this means that the corresponding part of the layer, membrane, area, plate, etc. is “directly above” the other part. In addition, it should be interpreted to include cases where there is another part in between. Conversely, when a part of a corresponding layer, membrane, region, plate, etc. is described as being "right on top" of another part, it may mean that there are no other parts in between. In addition, being "on" or "on" a reference part means being located above or below the reference part, and necessarily meaning being located "above" or "on" the direction opposite to gravity. Maybe not. Meanwhile, just as describing something as being “above” or “on” another part, explaining it as being “below” or “under” another part may also be understood with reference to the above-described content.

In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Hereinafter, a battery pack 1000 according to an embodiment of the present invention will be described with reference to FIG. 1.

1 is a diagram showing a battery pack according to an embodiment of the present invention.

As shown in FIG. 1, the battery pack 1000 of the present invention may include a plurality of cell unit blocks 11, a pack case 20, and an upper cover 30.

The cell unit block 11 may include a plurality of cell units 10, and the plurality of cell units may be stacked in one direction. As will be described again below, each cell unit 10 may include at least one battery cell and a cell cover that partially surrounds and supports the outside of the at least one battery cell. In this case, the at least one battery cell may include a pouch-type battery cell.

The pack case 20 has a seating structure in which the cell unit block 11 is directly seated without a separate case, and can be configured to accommodate and support a plurality of cell unit blocks 11 in separate internal spaces. . And the upper cover 30 may be configured in the form of a cover for the upper opening of the pack case 20. At this time, the upper cover 30 may be configured in the form of a box with an open bottom.

Meanwhile, in order to accommodate a plurality of cell unit blocks 11, the pack case 20 combines with the lower plate 21, on which the cell unit blocks 11 are seated, and the lower plate 21 to accommodate the cell unit blocks. It may include a side wall 22 forming an internal space S1.

On the outer surface of the side wall 22, a gas valve (not shown) is provided to discharge the internal gas of the battery pack 1000, and on the inner surface of the side wall 22 adjacent to the internal space S1, a cell unit block is provided. A gas inlet through which the gas generated in 11 flows may be provided. Additionally, the side wall 22 may have a side gas channel therein. One end of the side gas channel is connected to the gas inlet. It is connected and extends along the inside of the side wall 22, so that the other end can be connected to the gas valve.

In this case, the gas inlet and side gas channel of the side wall 22 and the gas venting path leading to the gas valve may be individually provided for each cell unit block. That is, the gas discharged from the first cell unit block is discharged through the first gas venting path leading to the first gas inlet, the first side gas channel, and the first gas valve, and the gas discharged from the second cell unit block is discharged through the first gas venting path leading to the first gas inlet, the first side gas channel, and the first gas valve. 1 It may be configured to be discharged through a second gas venting path leading to a second gas inlet, a second side channel, and a second gas valve provided separately from the gas inlet, the first side gas channel, and the first gas valve.

Meanwhile, the pack case 20 may further include a partition wall 24 that divides the internal space S1 into a plurality of spaces. Additionally, the pack case 20 may have a receiving space S2 that accommodates various electrical components required for the battery pack 1000.

The lower plate 21 may include a heat sink 23 in thermal contact with the cell unit block 11. The heat sink 23 is in thermal contact with the cell unit block 11 and may be configured to cool the cell unit block 11 and may be disposed inside or outside the lower plate 21 . Additionally, to have cooling performance, the heat sink 23 may be made of a metal material with high thermal conductivity and heat resistance. Additionally, although not shown, a thermal resin layer (not shown) may be formed below the cell unit block 11. The thermal resin layer can transfer heat to the heat sink 23 so that heat generated from the battery cell can be dissipated through the heat sink 23. Additionally, because the thermal resin layer has adhesive properties, the upright state of the cell unit 10 included in the cell unit block 11 can be maintained more stably.

Next, referring to FIGS. 2 to 4, the configuration of the cell unit 10 will be described in more detail.

FIG. 2 is a perspective view showing a cell unit of a battery pack according to an embodiment of the present invention, FIG. 3 is an exploded perspective view showing the cell unit shown in FIG. 2, and FIG. 4 is a cross-sectional view showing the cell cover shown in FIG. 3. am.

As shown in FIGS. 2 and 3 , the cell unit 10 may include at least one battery cell 100 and a cell cover 200 that partially covers the outside of the battery cell 100. This cell cover 200 covers both sides and the top of at least one battery cell 100 and may have a structure that is open to the front, rear, and bottom sides of the battery cell 100.

Referring to FIG. 3 , the cell unit 10 may include at least one battery cell 100, a cell cover 200, and a bus bar assembly 300.

The battery cell 100 of the cell unit 10 corresponds to the basic unit of charge and discharge, and can be manufactured by storing an electrode assembly and an electrolyte material inside a soft metal case and sealing the metal case. . In this case, the electrode assembly can be manufactured by interposing a separator between the anode electrode and the cathode electrode.

Additionally, electrode leads electrically connected to the electrode assembly may be provided at the front and rear ends of the battery cell 100. These battery cells may be configured in the form of a pouch. One cell unit 10 may include one or more battery cells 100, and when a plurality of battery cells 100 are included, they may be stacked in at least one direction. For example, referring to what is shown in FIG. 3, a plurality of battery cells 100 may be stacked and arranged in the x-axis direction of the drawing. As the battery cell 100, various types of battery cells 100 known at the time of filing of the present invention can be used, and therefore detailed description of the configuration of the battery cell 100 will be omitted.

The cell cover 200 may be configured to partially surround and support the outside of at least one battery cell 100. In this case, the cell cover 200 may be configured to support at least one pouch-type battery cell in an upright position.

For example, as shown in FIG. 3, the cell cover 200 may be configured to partially cover the outside of the three pouch-shaped battery cells 100 and support the battery cells 100 in an upright position. Accordingly, the battery cells 100 can be directly seated and stored inside the pack case 20 without a module case. In particular, in the case of the battery cells 100, the exterior material is made of a soft material, so it is vulnerable to external shock and has low hardness. Therefore, it is not easy to store the battery cell 100 itself inside the pack case 20 without storing it in the module case. However, in the case of this embodiment, the plurality of battery cells 100 are combined with the cell cover 200 in a state in which at least a portion is surrounded by the cell cover 200 and are directly stored inside the pack case 20. The stacked state can be maintained stably.

According to this embodiment of the present invention, there is no need to additionally provide the battery pack 1000 with a module case, a stacking frame, or fastening members such as bolts for maintaining the stacked state of the cells. Accordingly, the space occupied by other components, such as a module case or a stacking frame, or the resulting space for securing tolerances can be eliminated. Therefore, since the battery cells can occupy more space as the space removed, the energy density of the battery pack can be further improved.

Additionally, according to this aspect of the present invention, since a module case, stacking frame, bolts, etc. are not provided, the volume and weight of the battery pack can be reduced and the manufacturing process can be simplified.

Additionally, according to this aspect of the present invention, handling of the battery cell 100 may become easier. For example, when storing a plurality of battery cells 100 inside a pack case, the battery cells 100 can be held by a jig or the like. At this time, the jig may not directly hold the battery cell 100, but may hold the cell cover 200 surrounding the battery cell 100. Accordingly, damage or breakage of the battery cell 100 caused by the jig can be prevented.

Additionally, according to this aspect of the present invention, the cell cover 200 is coupled to the battery cell 100, so that the battery cell 100 can be effectively protected without a module case.

In one embodiment, the cell cover 200 includes a first cover portion 210 that covers one side of the at least one battery cell 100, and a first cover portion 210 that covers the other side of the at least one battery cell 100. It may include a second cover part 220 and a cap part 230 that connects the first cover part 210 and the second cover part 220 and covers the top of the at least one battery cell 100. You can. That is, the battery cell 100 may be configured to cover the remaining three sides except for the front side, the rear side, and the bottom side where the electrode lead protrudes.

For example, the cell cover 200 may be configured to cover three sides of at least one battery cell 100, and may have an overall cross-section of an 'n' shape, a 'u' shape, or a 'ㄷ' shape. It can be.

As will be described again below, the cap portion 230 is detachably coupled to the first cover portion 210 and the second cover portion 220, for example, by a snapfit method or an insertion method. It can be configured to be combined.

In this way, the cell cover 200 of a simplified structure is made of a metal material with higher rigidity than the case of the battery cell 100, and at least one battery cell 100 covered by the cell cover 200 Can be protected from external shock or vibration. For example, the cell cover 200 may be made of a material containing stainless steel (SUS), which is easy to process and has high corrosion resistance. In this way, when the cell cover 200 is made of a steel material, it has excellent mechanical strength and rigidity, so the stacked state of the battery cells 100 can be more stably supported. Additionally, in this case, it is possible to more effectively prevent damage or breakage of the battery cell 100 from external impacts, such as acicular bodies. Additionally, in this case, handling of the battery cell may become easier.

Additionally, as in the above embodiment, when the cell cover 200 is made of a steel material, due to its high melting point, when a flame occurs from the battery cell 100, the overall structure can be stably maintained. In particular, in the case of steel material, the melting point is higher than that of aluminum material, so it does not melt even with flame emitted from the battery cell 100 and its shape can be stably maintained. Accordingly, excellent flame propagation prevention and delay effects between battery cells 100, venting control effects, etc. can be secured.

Meanwhile, the bus bar assembly 300 is coupled to the electrode lead exposed on the side not covered by the cell cover 200. The busbar assembly 300 includes a busbar frame 310 and a busbar 320 coupled thereto. That is, the bus bar 320 is electrically connected to the electrode lead of at least one battery cell 100 covered by the cell cover 200, and the bus bar frame 310 supports the bus bar 320. It can be configured. Additionally, the bus bar assembly 300 may be configured to electrically connect a plurality of battery cells 100 to each other. For example, it may be coupled to the electrode leads of the plurality of battery cells 100 to electrically connect the plurality of battery cells 100 in series and/or in parallel. The busbar assembly 300 may be coupled to the cell cover 200 in various ways. For example, the bus bar assembly 300 may be coupled and fixed to the cell cover 200 through various fastening methods such as adhesive, welding, fitting, hook, bolting, and riveting.

The insulating cover 330 may be configured to prevent short circuit of the electrode lead or bus bar 320. To this end, the insulating cover 330 may be made of polymer synthetic resin with insulating properties, prevents the bus bar assembly 300 from being exposed to the outside, and secures and maintains electrical insulation.

Although not shown in FIGS. 2 and 3 , the cell unit 10 may further include a clamping member configured to clamp the cell cover 200 . The clamping member clamps the cell cover 200 into which at least one battery cell 100 is inserted, and both ends of the cell cover 200 (ends of the first cover part 210 and the second cover part ( 220) ends) may be configured to prevent the space between the battery cells 100 and the inserted battery cells 100 from separating from the cell cover 200. This clamping member may be made of tape or may be made of an elastic metal material.

In FIG. 3, there are three battery cells 100 covered by one cell cover 200, but the number of battery cells 100 covered by the cell cover 200 is the same as that of the cell cover 200. Of course, it can change in various ways depending on the scale.

Below, the configuration of the cell cover 200 will be described in more detail with reference to FIG. 4.

As shown in FIG. 4, it may include the cell cover 200, a first cover part 210, a second cover part 220, and a cap part 230.

The first cover part 210 may be configured to cover one side of at least one battery cell 100. This first cover part 210 may be integrally formed using a metal plate.

The second cover part 220 faces the first cover part 210 at a predetermined distance and may be configured to cover the other side of the at least one battery cell 100. This first cover part 210 may be integrally formed using a metal plate.

The cap portion 230 may be configured to connect the first cover portion 210 and the second cover portion 220 and cover the upper portion of the at least one battery cell 100. This cap portion 230 may be integrally formed using a metal plate.

In addition, the cap portion 230 is detachably coupled to the first cover portion 210 and the second cover portion 220, and may be configured to be coupled, for example, in a snap-fit method or a snap-fit method. To this end, the first cover part 210 and the second cover part 220 are provided with a first fastening groove 211 and a second fastening groove 221 at the upper ends, respectively, and the cap part 230 is , a first fastening protrusion 231 fastened to the first fastening groove 211 of the first cover part 210 in a snap-fit or fitting manner, and a second fastening groove of the second cover part 220 ( 212) may be provided with a second fastening protrusion 232 that is fastened by a snap fit method or a fitting method. When the cap part 230 is coupled in this way by a snap-fit method or a fitting method, when the internal pressure of the cell unit 100 increases, the cap part 230 is separated by the internal pressure, thereby causing the inside of the cell unit 100 to It is possible to induce gas to be discharged upward.

Meanwhile, in one embodiment, the first cover part 210 and the second cover part 220 have upper ends curved inward where the at least one battery cell 100 is located, thereby forming the first and second cover parts. Fastening grooves 211 and 221 may be formed.

In addition, the cap portion 230 has one end in the width direction (X-axis direction) adjacent to the first cover portion 210 bent toward the inside of the cell cover 200 to form the first fastening protrusion 231. , the other end in the width direction adjacent to the second cover portion 220 may be bent toward the inside of the cell cover 200 to form the second fastening protrusion 232. The first and second fastening protrusions 231 and 232 of the cap portion 230 are coupled to the first fastening groove 211 and the second fastening groove 221, respectively. A variety of joining methods can be applied, and can be joined by a snap fit or insert method. For example, when coupled by a fitting method, the fastening protrusions 231 and 232 and the fastening grooves 211 and 221 are formed to extend in the longitudinal direction (y-axis direction of the drawing) of the cell cover 200. It is possible to fasten (231, 232) while sliding in the longitudinal direction of the cell cover (200) from one end of the fastening grooves (211, 221). However, it is not limited to this and can be combined in various ways.

Meanwhile, the cap portion 230 may be configured to be spaced apart from the battery cell 100 inserted between the first cover portion 210 and the second cover portion 220 at a predetermined distance to form a gas transfer passage.

As such, according to one embodiment of the present invention, the three sides forming the cell cover 200 are not formed integrally, but a first cover portion covering one side of the at least one battery cell 100 ( 210), a second cover part 220 that covers the other side of the at least one battery cell 100, and is formed to be separable from the first cover part 210 and the second cover part 220. By having a configuration in which the cap portion 230 that connects them and covers the upper part of the at least one battery cell 100 is combined, manufacturing and assembly of the cell cover 200 can be facilitated and flatness can be improved. there is.

In addition, the cap portion 230 is formed to be separable from the first cover portion 210 and the second cover portion 220 and is coupled to the first cover portion 210 and the second cover portion 220 in a snap-fit or insert manner, thereby increasing the gas pressure inside the cell unit 100. When the cap part 230 is separated from the first cover part 210 and the second cover part 220, the gas inside the cell unit 100 can be induced to be discharged upward.

Next, with reference to FIGS. 5 and 6, a cell cover according to a modified example of the present invention will be described.

Figure 5 is a perspective view showing a cell cover according to a modified example, and Figure 6 is a cross-sectional view showing the cell cover shown in Figure 5.

As shown in FIGS. 5 and 6, the cell cover 201 according to a modified embodiment, like the cell cover 200 shown in FIGS. 3 and 4, includes a first cover portion 210 and a second cover portion 210. It may include a cover part 220 and a cap part 230. In addition, the cell cover 201 may further include blocking portions 212 and 222.

The blocking parts 212 and 222 may be configured to block removal of at least one battery cell 100 inserted between the first cover part 210 and the second cover part 220. That is, the blocking portions 212 and 222 include a first blocking portion 212 extending from the distal end of the first cover portion 210 and a second blocking portion 222 extending from the distal end of the second covering portion 220. It includes, and the first and second blocking portions 212 and 222 may be configured to support the lower portion of at least one battery cell 100.

These first and second blocking parts 212 and 222 extend from the ends of each of the first cover part 210 and the second cover part 220 to the inside of the cell cover 201 into which the battery cell 100 is inserted. It is bent to form a hanging structure. That is, the end of the lower part, which is opposite to the upper part where the first and second fastening grooves 211 and 221 are formed, is bent toward the inside where the battery cell 100 is placed so that the battery cell 100 is placed so that the first And second blocking portions 212 and 222 may be formed.

The first and second blocking portions 212 and 222 support the battery cell 100 inserted into the cell cover 201 and prevent the battery cell 100 from being removed, thereby changing the position of the battery cell 100. By preventing changes or leaving the cell cover 201, the safety and reliability of the battery pack can be guaranteed.

Additionally, the first and second blocking portions 212 and 222 may not be formed equally throughout, but may include portions that are not formed at predetermined intervals. In this way, the portion removed in the longitudinal direction of the cell cover 200 without forming the first and second blocking portions 212 and 222 forms the insertion groove 240. The fingers of the jig can be inserted into the insertion groove 240 during the manufacturing process, and the fingers of the jig inserted through the insertion groove 240 are inserted into the inner surfaces of the first cover part 210 and the second cover part 220. The distance between the first cover part 210 and the second cover part 220 may be changed by contacting the first cover part 210 and the second cover part 220 to both sides. This configuration can widen the gap between the first cover part 210 and the second cover part 220 to facilitate easy insertion of the battery cell 100 into the cell cover 201.

In this way, the insertion groove 240, into which a jig configured to change the spacing between both ends of the cell cover 201 by contacting the inner surface of the cell cover 201, is inserted, is the blocking portion of the cell cover 201 ( By being provided at 212 and 222, the assembly process of inserting the battery cell 100 into the cell cover 201 can be facilitated and damage to the battery cell 100 during the assembly process can be prevented.

Hereinafter, a cell cover according to another modified example of the present invention will be described with reference to FIG. 7.

Figure 7 is a cross-sectional view showing a cell cover according to another modified example.

As shown in Figure 7, the cell cover 202 according to another embodiment, like the cell cover 201 shown in Figures 5 and 6, includes a first cover part 210 and a second cover part ( 220), a cap portion 230, and blocking portions 212' and 222'.

In particular, the first and second blocking parts 212' and 222' of the cell cover 202 according to another modification are located at each end of the first cover part 210 and the second cover part 220. It may include a bent structure that is bent toward the cap portion 230 and then bent round again toward the opposite side of the cap portion 230. In this way, the first and second blocking portions 212' and 222' are configured to support the battery cells 100 with round surfaces, thereby preventing damage to the soft battery cells 100 such as pouch cells. .

Figure 8 is a diagram showing a device according to another embodiment of the present invention.

As shown in FIG. 8, a device according to an embodiment of the present invention may be a car 2, and this device includes at least one battery pack (according to any one of the various embodiments described above) 1000).

In this way, the battery pack 1000 provided in the vehicle 2 can provide electrical energy required for various operations of the vehicle 2.

For reference, of course, the battery pack according to the present invention can be applied to ESS (Energy Storage System) and various devices other than automobiles.

As described above, according to the present invention, the plurality of battery cells 100 are not accommodated in a separate module case and mounted on the pack case of the battery pack, but are partially stored by the cell cover 200 of a simplified structure. By covering only the battery pack and mounting it directly on the pack case, it reduces the weight and volume of the entire battery pack and increases the energy density of the battery pack, while facilitating safe handling and installation of the battery cells 100 when manufacturing the battery pack. Costs can be reduced.

In addition, the cell cover 200 includes a first cover portion 210 that covers one side of the at least one battery cell 100, and a second cover portion that covers the other side of the at least one battery cell 100. It is composed of a combination of a cover part 220 and a cap part 230 that connects the first cover part 210 and the second cover part 220 and covers the upper part of the at least one battery cell 100. As a result, manufacturing and assembly of the cell cover 200 can be facilitated and flatness can be improved.

In addition, the cap part 230 is coupled to the first cover part 210 and the second cover part 220 in a snap-fit manner or a fitting method, so that when the gas pressure inside the cell unit increases, the cap part 230 It can be separated from the first cover part 210 and the second cover part 220, and as a result, the gas inside the cell unit can be induced to be discharged upward.

In addition, the blocking portions 212 and 222 of the cell cover 201 support the battery cell 100 inserted into the cell cover 201 and block removal of the battery cell 100, thereby preventing the battery cell 100 from being removed. ) can be prevented from changing its position or leaving the cell cover 201, and the safety and reliability of the battery pack can be guaranteed.

In addition, the insertion groove 240, into which a jig configured to contact the inner surface of the cell cover 201 and change the gap between both ends of the cell cover 201, is inserted, is formed in the blocking portion 212 of the cell cover 200. , 222), the assembly process of inserting the battery cell 100 into the cell cover 201 can be facilitated and damage to the battery cell 100 can be prevented.

Furthermore, it goes without saying that embodiments according to the present invention can solve various technical problems other than those mentioned in this specification in the relevant technical field as well as related technical fields.

So far, the present invention has been described with reference to specific embodiments. However, those skilled in the art will clearly understand that various modified embodiments can be implemented within the technical scope of the present invention. Therefore, the previously disclosed embodiments should be considered from an explanatory perspective rather than a limiting perspective. In other words, the scope of the true technical idea of the present invention is shown in the claims, and all differences within the scope of equivalents should be construed as being included in the present invention.

10: cell unit
11: Cell unit block
20: pack case
30: Top cover
100: battery cell
200, 201, 202: Cell cover
210: first cover part
220: second cover part
230: Cap part
211: first fastening groove
212: Second fastening groove
231: First fastening protrusion
232: Second fastening protrusion
212, 212': first blocking portion
222, 222': second blocking unit
240: insertion groove
300: Busbar assembly
330: Insulating cover
1000: Battery pack

Claims (12)

A plurality of cell units each including at least one battery cell and a cell cover that surrounds and supports the at least one battery cell; and
Comprising a pack case that accommodates and supports the plurality of cell units in an internal space,
The cell cover is,
a first cover portion covering one side of the at least one battery cell;
a second cover portion covering the other side of the at least one battery cell; and
A cap portion connects the first cover portion and the second cover portion and covers an upper portion of the at least one battery cell,
A battery pack wherein the cap portion is detachably coupled to the first cover portion and the second cover portion. In paragraph 1:
A battery pack in which the cap part is coupled to the first cover part and the second cover part in a snap-fit manner or a snap-fit manner. In paragraph 1:
Each of the first cover part and the second cover part has a first fastening groove and a second fastening groove at an upper end adjacent to the cap part, respectively,
The cap portion includes a first fastening protrusion that is fastened to the first fastening groove in a snap-fit manner or a fitting manner, and a second fastening protrusion that is fastened to the second fastening groove in a snap-fit manner or a fitting manner. In paragraph 3,
The first fastening groove and the second fastening groove are configured such that the upper ends of the first cover portion and the second cover portion are curved inwardly of the cell cover where the at least one battery cell is located. pack. In paragraph 3,
The first fastening protrusion is formed by bending one end of the tab portion adjacent to the first cover portion,
The second fastening protrusion is a battery pack formed by bending the other end of the tab portion adjacent to the second cover portion. In paragraph 3,
The first cover portion and the second cover portion further include a blocking portion supporting a lower portion of the at least one battery cell at a lower portion opposite to the upper portion. In paragraph 6:
The blocking portion is formed to extend from the lower portion of the first cover portion and the second cover portion in an inner direction of the cell cover. In paragraph 7:
The blocking portion is a battery pack including a locking structure formed by bending the lower portion of the first and second cover portions toward the inside of the cell cover. In paragraph 7:
The blocking portion is a battery pack including a bent structure that is bent from the lower end of the first cover portion and the second cover portion toward the cap portion and then bent roundly to the opposite side of the cap portion. In paragraph 6:
The blocking portion is a battery pack including at least one insertion groove formed by partially removing the blocking portion in the longitudinal direction of the cell cover. In paragraph 1:
The cell cover is a battery pack containing stainless steel (SUS). A device comprising the battery pack according to claim 1.

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