KR20240097710A - Cylindrical battery cell, and battery pack and vehicle including the same and, method of producing cylindrical battery cell - Google Patents

Abstract

A cylindrical battery cell, a battery pack and automobile including the same, and a method of manufacturing a cylindrical battery cell are disclosed. A cylindrical battery cell according to an embodiment of the present invention includes an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive and negative electrode plates are wound in one direction; a battery can having an open portion in which the electrode assembly is accommodated and a closure portion formed on the opposite side of the open portion; and a cap plate that seals the opening of the battery can, and the battery can includes a beading portion that is press-fitted into the inside of the battery can in an area adjacent to the opening and is inclined at a preset angle.

Description

Cylindrical battery cell, battery pack and vehicle including same, and method of producing cylindrical battery cell {Cylindrical battery cell, and battery pack and vehicle including the same and, method of producing cylindrical battery cell}

The present invention relates to a cylindrical battery cell, a battery pack and automobile including the same, and a method of manufacturing a cylindrical battery cell. More specifically, a cylindrical battery cell capable of easily discharging flame or gas inside the cylindrical battery cell. and a battery pack and automobile including the same, and a method of manufacturing a cylindrical battery cell.

Secondary batteries, which are easy to apply depending on the product group and have electrical characteristics such as high energy density, are used not only in portable devices but also in electric vehicles (EV, Electric Vehicle) and hybrid vehicles (HEV, Hybrid Electric Vehicle) that are driven by an electrical drive source. It is universally applied.

These secondary batteries not only have the primary advantage of being able to dramatically reduce the use of fossil fuels, but also have the advantage of not generating any by-products due to energy use, so they are attracting attention as a new energy source for eco-friendliness and improving energy efficiency.

Types of secondary batteries currently widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, and nickel zinc batteries. The operating voltage of these unit secondary battery cells is approximately 2.5V to 4.5V.

Therefore, when a higher output voltage is required, a battery module or battery pack is formed by connecting a plurality of battery cells in series. Additionally, a battery module or battery pack may be formed by connecting multiple battery cells in parallel depending on the required charge/discharge capacity. Accordingly, the number and electrical connection type of battery cells included in the battery module or battery pack can be set in various ways depending on at least one of the required output voltage and charge/discharge capacity.

Meanwhile, cylindrical, prismatic, and pouch-type battery cells are known as types of secondary battery cells. In the case of a cylindrical battery cell, an insulating separator is interposed between the positive and negative electrode plates and wound to form a jelly roll-shaped electrode assembly, which is then inserted into a battery can along with the electrolyte to form a battery.

Figure 1 is a diagram schematically showing a battery can of a conventional cylindrical battery cell.

Referring to FIG. 1, a beading portion 2 is formed in the battery can 1 of a conventional cylindrical battery cell. Here, the beading portion 2 is formed at the end adjacent to the opening 3 of the battery can 1. In the case of the battery can 1 of a conventional cylindrical battery cell, the upper and lower surfaces of the beading portion 2 are horizontal lines ( It is formed parallel to 4).

However, if the upper and lower surfaces of the beading portion (2) are formed parallel to the horizontal line (4), when a thermal event occurs, flame or gas hits the beading portion (2) and returns to the inside of the battery can (1), as shown by the arrow in FIG. , As a result, the flame or gas cannot be discharged to the outside and stays within the battery can (1). As the time that the flame or gas stays inside the battery can (1) increases, the internal pressure increases, thereby increasing the risk of explosion.

Therefore, the technical problem to be solved by the present invention is a cylindrical battery cell that can easily discharge flame or gas generated inside the battery can of the cylindrical battery cell, a battery pack and automobile including the same, and a method of manufacturing a cylindrical battery cell. is to provide.

In addition, the present invention provides a cylindrical battery cell that can shorten the residence time of flame or gas generated inside the battery can of the cylindrical battery cell, a battery pack and automobile including the same, and a method of manufacturing the cylindrical battery cell.

However, the technical problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

According to one aspect of the present invention, an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction; a battery can having an opening in which the electrode assembly is accommodated and a closure formed on an opposite side of the opening; and a cap plate that seals the opening of the battery can, wherein the battery can includes a beading portion that is press-fitted into the inside of the battery can in an area adjacent to the opening and is inclined at a preset angle. A cell may be provided.

In one embodiment, the beading portion includes an upper inclined portion having a first inclined portion; a lower slope formed with a second slope; And it may include a connection part connecting the upper slope and the lower slope.

In one embodiment, the first slope of the upper slope and the second slope of the lower slope may have different slopes.

In one embodiment, the first slope may be greater than the second slope.

In one embodiment, the upper inclined portion and the lower inclined portion may be formed to face the opening portion of the battery can.

In one embodiment, the cap plate includes a vent notch that ruptures when the pressure inside the battery can exceeds a critical value, and the upper slope allows flame or gas generated inside the battery can to move to the vent notch. It may be formed toward the vent notch so as to do so.

In one embodiment, the upper slope may guide the flame or the gas to move to the vent notch.

In one embodiment, the vent notches are formed on both sides of the cap plate, and may be formed in at least one of a continuous circular pattern, a discontinuous circular pattern, and a straight line pattern on the surface of the cap plate.

In one embodiment, the vent notch is formed at the bottom of the battery can based on the arrangement state of the battery can, and when the vent notch is ruptured, the flame or the gas inside the battery can is ejected from the battery can. It can be discharged through the bottom.

In one embodiment, it may include a sealing gasket interposed between the edge of the cap plate and the open portion of the battery can.

In one embodiment, the battery can may include a crimping portion that extends and bends inside the battery can to surround and secure an edge of the cap plate together with the sealing gasket.

Meanwhile, according to another aspect of the present invention, a battery pack including at least one of the above-described cylindrical battery cells may be provided, and a vehicle may be provided including at least one of the above-described cylindrical battery cells.

Meanwhile, according to another aspect of the present invention, an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction is connected to the battery can through an opening of the battery can. Inserting step: forming a beading portion that is pressed into the inside of the battery can to be inclined at a preset angle in an area adjacent to the opening; and a cap plate sealing the opening of the battery can. A method of manufacturing a cylindrical battery cell may be provided.

In one embodiment, forming the beading portion may include press-fitting the battery can with an inclined beading knife.

Embodiments of the present invention have the effect of easily discharging flame or gas generated inside the battery can of a cylindrical battery cell.

In addition, there is an effect of shortening the residence time of flame or gas generated inside the battery can of a cylindrical battery cell.

Additionally, it has the effect of lowering the risk of explosion when a thermal event occurs in a cylindrical battery cell.

However, the effects that can be achieved through the present invention are not limited to the above-mentioned effects, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the invention to be described later. Therefore, the present invention includes the matters described in such drawings. It should not be interpreted as limited to only .
Figure 1 is a diagram schematically showing a battery can of a conventional cylindrical battery cell.
Figure 2 is a perspective view of a cylindrical battery cell according to an embodiment of the present invention.
Figure 3 is a diagram showing a portion of a battery can in which a beading portion is formed in a cylindrical battery cell according to an embodiment of the present invention.
Figure 4 is a cross-sectional view of a cylindrical battery cell according to an embodiment of the present invention.
Figure 5 is a diagram showing how flame or gas is guided by a beading portion in a cylindrical battery cell according to an embodiment of the present invention.
Figure 6 is a diagram showing a battery can in which a beading portion and a crimping portion are formed in a cylindrical battery cell according to an embodiment of the present invention.
FIG. 7 is a perspective view showing a cross section of a cylindrical battery cell according to a modified embodiment of FIG. 2.
Figure 8 is a diagram showing an inclined beading knife press-fitting a beading portion to manufacture a cylindrical battery cell according to an embodiment of the present invention.
Figure 9 is a diagram schematically showing the configuration of a battery pack including cylindrical battery cells according to each embodiment of the present invention.
Figure 10 is a diagram for explaining a vehicle including a battery pack according to each embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Terms or words used in this specification and claims should not be construed as limited to their common or dictionary meanings, and the inventor may appropriately define the concept of terms in order to explain his or her invention in the best way. It must be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it is. Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, so at the time of filing the present application, various methods that can replace them are available. It should be understood that equivalents and variations may exist.

In the drawings, the size of each component or a specific part constituting the component is exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect the actual size. If it is determined that specific descriptions of related known functions or configurations may unnecessarily obscure the gist of the present invention, such descriptions will be omitted.

The term 'couple' or 'connection' used in this specification refers not only to the case where one member is directly coupled to another member, or directly connected, but also to the case where one member is indirectly coupled to another member through a joint member. Also includes cases where it is connected to .

Figure 2 is a perspective view of a cylindrical battery cell according to an embodiment of the present invention, Figure 3 is a diagram showing a portion of a battery can in which a beading portion is formed in a cylindrical battery cell according to an embodiment of the present invention, and Figure 4 is a view showing a portion of the battery can in which the beading portion is formed. It is a cross-sectional view of a cylindrical battery cell according to an embodiment of the present invention, Figure 5 is a diagram showing a flame or gas being guided by a beading part in a cylindrical battery cell according to an embodiment of the present invention, and Figure 6 is a This is a diagram showing a battery can in which a beading portion and a crimping portion are formed in a cylindrical battery cell according to an embodiment of the invention.

2 to 4, a cylindrical battery cell 10 according to an embodiment of the present invention includes an electrode assembly 100, a battery can 200, and a cap plate 300.

Referring to FIG. 4, the electrode assembly 100 has a structure in which a positive electrode plate 110, a negative electrode plate 120, and a separator 130 interposed between the positive electrode plate 110 and the negative electrode plate 120 are wound in one direction. . Additionally, a central hole 140 is formed in the center of the electrode assembly 100, and may be formed in a jelly roll type.

For example, the electrode assembly 100 may be manufactured by winding a laminate formed by sequentially stacking the negative electrode plate 120, the separator 130, the positive plate 110, and the separator 130 at least once. . Here, the positive electrode plate 110 and the negative electrode plate 120 may be formed in a sheet shape.

That is, the electrode assembly 100 applied to this embodiment may be a wound-type electrode assembly 100. In this case, an additional separator 130 may be provided on the outer peripheral surface of the electrode assembly 100 to insulate it from the battery can 200. That is, the electrode assembly 100 may have a winding structure well known in the related technical field without limitation.

A positive electrode active material may be applied to one or both sides of the positive electrode plate 110, and a first uncoated portion in which no positive active material is applied may be formed at an end of the positive electrode plate 110. The first uncoated portion is exposed to the outside of the separator 130 while forming a plurality of winding turns based on the center of the electrode assembly 100, and can itself be used as an electrode tab. However, the first uncoated region may not be formed on the positive electrode plate 110 as shown in FIG. 4 .

A negative electrode active material may be applied to one or both sides of the negative electrode plate 120, and a second uncoated portion in which no negative electrode active material is applied may be formed at an end of the negative electrode plate 120. The second uncoated portion is exposed to the outside of the separator 130 while forming a plurality of winding turns based on the center of the electrode assembly 100, and can itself be used as an electrode tab. However, as shown in FIG. 4, the second uncoated region may not be formed on the negative electrode plate 120.

Here, when the positive electrode plate 110 and the negative electrode plate 120 each include an uncoated portion, the first uncoated portion and the second uncoated portion may be configured to face opposite directions.

In addition, the positive electrode active material coated on the positive electrode plate 110 and the negative electrode active material coated on the negative electrode plate 120 may be used without limitation as long as they are active materials known in the art.

The separator 130 is a porous polymer film, for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, ethylene/methacrylate copolymer, etc. Can be used alone or by stacking them.

As another example, the separator 130 may use a typical porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, etc.

At least one surface of the separator 130 may include a coating layer of inorganic particles. Additionally, it is possible that the separator 130 itself is made of a coating layer of inorganic particles. The particles constituting the coating layer may have a structure combined with a binder such that an interstitial volume exists between adjacent particles.

In addition, the center hole 140 of the electrode assembly 100 is also used for welding the cell terminal 500 (positive terminal) and the positive electrode current collector plate 400. That is, it may be configured to weld the cell terminal 500 and the positive electrode current collector plate 400 by irradiating a laser through the center hole 140 of the electrode assembly 100.

Referring to FIG. 4, the electrode assembly 100 is accommodated in the battery can 200. And, referring to FIG. 6, a through hole 211 may be formed in the battery can 200. Here, the battery can 200 is formed in a cylindrical shape, the electrode assembly 100 is stored inside the battery can 200, and can be electrically connected to the negative electrode plate 120 of the electrode assembly 100. Accordingly, the battery can 200 may have the same polarity as the negative electrode plate 120, that is, the negative electrode.

The diameter of the battery can 200 is formed to be larger than the diameter of the electrode assembly 100. A gap of a preset size is formed between the battery can 200 and the positive electrode current collector 400, and an insulator 600 (see FIG. 4) may be interposed between the gap.

If the size of the battery can 200 is set according to the standard and the size of the electrode assembly 100 is increased, the total capacity of the battery cell increases, but the gap between the battery can 200 and the electrode assembly 100 increases. decreases.

That is, if the size of the electrode assembly 100 is increased to increase the overall capacity of the battery cell, the gap between the battery can 200 and the electrode assembly 100 is reduced, so to increase the capacity of the battery cell, the battery can 200 ) and the electrode assembly 100, the insulator 600 must be able to be interposed between the reduced gap, and for this purpose, the thickness of the insulator 600 is preferably as thin as possible.

Referring to FIG. 6, a closed portion 210 and an open portion 220 may be formed in the battery can 200 to face each other.

For example, with reference to FIG. 6 , an opening 220 may be formed in the lower portion of the battery can 200. The electrode assembly 100 is accommodated through the opening 220 formed at the bottom of the battery can 200, and electrolyte is also injected through the opening 220 formed at the bottom of the battery can 200.

That is, the battery can 200 is a substantially cylindrical container with an opening 220 formed at the bottom, and may be made of a conductive material such as metal, for example. The material of the battery can 200 may be made of a conductive metal, such as aluminum, steel, or stainless steel, but is not limited thereto.

Additionally, based on FIG. 6, a closure portion 210 may be formed at the top of the battery can 200. The closed portion 210 may be partially formed on the opposite side of the open portion 220 . A through hole 211 is formed in the closing portion 210, and as shown in FIGS. 2 and 4, the cell terminal 500 is coupled to the through hole 211, and the cell terminal 500 is connected through the through hole 211. is electrically connected to the positive electrode current collector 400. And, referring to FIG. 4, an insulator 600 may be interposed between the battery can 200 and the positive electrode current collector 400 on the closed portion 210 side.

The positive electrode current collector plate 400 is electrically connected to the positive electrode plate 110, for example, at the top of the electrode assembly 100. For example, the positive electrode current collector plate 400 is made of a conductive metal material and may be electrically connected to the first uncoated portion of the positive electrode plate 110.

The cell terminal 500 is made of a conductive metal material and is coupled to the through hole 211 formed in the closing portion 210 of the battery can 200 to connect the positive electrode current collector 400 and the through hole 211. are electrically connected. Additionally, the cell terminal 500 is electrically connected to the positive electrode plate 110 of the electrode assembly 100 through the positive electrode current collector plate 400 and thus has positive polarity.

That is, the cell terminal 500 can function as a positive terminal. Additionally, the battery can 200 is electrically connected to the negative electrode plate 120 of the electrode assembly 100 as described above, and thus may have negative polarity.

The negative electrode current collector plate 700 is electrically connected to the negative electrode plate 120, for example, at the bottom of the electrode assembly 100. For example, the negative electrode current collector plate 700 is made of a conductive metal material such as aluminum, steel, copper, or nickel, and may be electrically connected to the second uncoated portion of the negative electrode plate 120.

The negative electrode current collector 700 may be electrically connected to the battery can 200. To this end, the negative electrode current collector 700 may be fixed with at least a portion of its edge portion interposed between the inner surface of the battery can 200 and the sealing gasket 250.

Referring to FIG. 4 as one embodiment, at least a portion of the edge of the negative electrode current collector 700 is beaded by welding while supported on the bottom surface of the beading portion 230 formed at the bottom of the battery can 200. It may be fixed to unit 230.

Also, at least a portion of the remaining portion of the negative electrode current collector plate 700, excluding the coupling portion of the beading portion 230, may be joined to the curved surface of the second uncoated portion through welding, for example, laser welding.

Additionally, at least a portion of an edge of the negative current collector plate 700 may be electrically coupled to the upper and lower surfaces of the beading portion 230 adjacent to the crimping portion 240 .

Referring to FIG. 4, the cap plate 300 is configured to seal the opening 220 (see FIG. 6) formed at the bottom of the battery can 200. The cap plate 300 may be made of, for example, a metal material to ensure rigidity.

Additionally, the cap plate 300 may be separated from the electrode assembly 100 and provided as non-polar. That is, the cap plate 300 may not have polarity even if it is made of a conductive metal material.

The fact that the cap plate 300 does not have polarity means that the cap plate 300 is electrically insulated from the battery can 200 and the cell terminal 500. As such, the cap plate 300 does not need to have polarity, and its material does not necessarily have to be a conductive metal.

The cap plate 300 may be seated and supported on the beading portion 230 formed on the battery can 200. Additionally, the cap plate 300 is fixed by a crimping portion 240, which will be described later. A sealing gasket 250 may be interposed between the cap plate 300 and the crimping portion 240 of the battery can 200 to ensure airtightness of the battery can 200. That is, the sealing gasket 250 may be provided to be interposed between the edge of the cap plate 300 and the open portion 220 of the battery can 200.

Additionally, a vent notch 310 may be formed in the cap plate 300 that ruptures due to internal pressure of the battery can 200.

The vent notch 310 may be formed in the cap plate 300 to rupture when the pressure inside the battery can 200 exceeds a critical value.

For example, the vent notch 310 may be formed on both sides of the cap plate 300, and may be formed in at least one of a continuous circular pattern, a discontinuous circular pattern, and a straight pattern on the surface of the cap plate 300. You can. Additionally, the vent notch 310 may be formed in a variety of different patterns.

The vent notch 310 is formed at the bottom of the battery can 200 based on the arrangement of the battery can 200 in FIG. 4, and when the vent notch 310 is ruptured, the gas inside the battery can 200 is discharged from the battery. It may be arranged to be discharged through the lower part of the can 200. For example, if the battery can 200 is arranged so that the cell terminal 500 is located at the top as shown in FIG. 4, the vent notch 310 may be formed at the bottom of the battery can 200 with respect to FIG. 4. there is.

The vent notch 310 may be formed as a region of the cap plate 300 with a thinner thickness compared to the surrounding region.

Since the vent notch 310 is thinner than the surrounding area, it can be broken more easily than the surrounding area. When the internal pressure of the battery can 200 increases above a certain level, the vent notch 310 is broken and the battery can ( The gas generated inside 200) may be discharged.

For example, the vent notch 310 may be formed by partially reducing the thickness of the battery can 200 through notching on one side or both sides of the cap plate 300.

The cylindrical battery cell 10 according to an embodiment of the present invention may have a structure in which both the positive and negative terminals are present at the top with reference to FIG. 4, and because of this, the upper structure is more complicated than the lower structure. .

Accordingly, a vent notch 310 may be formed in the cap plate 300 forming the lower surface of the cylindrical battery cell 10 to smoothly discharge the gas generated inside the battery can 200.

In this way, if the gas generated inside the battery can 200 provided in the cylindrical battery cell 10 is discharged downward, it may be advantageous for user safety.

For example, if the cylindrical battery cell 10 is placed right below the driver's seat in an electric vehicle, there may be a risk of a safety accident to the driver if gas is discharged to the top. However, if gas is discharged from the bottom of the battery can 200 as in the cylindrical battery cell 10 according to an embodiment of the present invention, the above The same problem does not occur.

A beading portion 230 and a crimping portion 240 may be formed on the lower portion of the battery can 200.

Referring to FIG. 4, the beading portion 230 allows the electrode assembly 100, which has a size approximately corresponding to the width of the battery can 200, to come out through the opening 220 formed at the bottom of the battery can 200. It supports the electrode assembly 100 and may also function as a support on which the cap plate 300 is seated. Additionally, the beading portion 230 may support the outer peripheral surface of the sealing gasket 250.

And, referring to Figures 2 and 4, the beading portion 230 is pressed inward around the outer circumference of the battery can 200 in an area adjacent to the opening 220 of the battery can 200 and is inclined at a preset angle. is formed

Referring to FIGS. 3 and 5 , the beading portion 230 may be configured to include an upper inclined portion 231, a lower inclined portion 232, and a connecting portion 233.

A first slope (θ1) is formed in the upper slope portion 231. The upper slope 231 may be formed to face the opening 220 of the battery can 200 due to the first slope θ1 formed on the upper slope 231 . For example, referring to FIG. 5, the upper inclined portion 231 has a vent notch 310 so that flame or gas generated inside the battery can 200 moves to the vent notch 310 (see arrow in FIG. 5). can be formed towards.

In this way, when the upper inclined portion 231 is formed to face the vent notch 310, when flame or gas occurs inside the cylindrical battery cell 10, the flame or gas is vented along the upper inclined portion 231 through the vent notch 310. ), so that rupture of the vent notch 310 can be induced more quickly and reliably. That is, the upper slope 231 guides the flame or gas to move to the vent notch 310, thereby causing the vent notch 310 to rupture more easily.

In addition, after the vent notch 310 ruptures, the flame or gas can be smoothly discharged to the outside. As a result, the time for which the gas stays inside the battery can 200 is reduced, and the internal pressure of the battery can 200 rapidly decreases. It can be prevented from increasing.

The upper inclined portion 231 may have a curved interior or be coated so that flame or gas can move smoothly toward the vent notch 310, but is not limited thereto.

A second slope θ2 is formed in the lower slope 232. The lower slope 232 may be formed to face the opening 220 of the battery can 200 due to the second slope θ2 formed on the lower slope 232 . However, if only the upper inclined portion 231 is used, flame or gas can easily move toward the vent notch 310, thereby easily dissipating flame or gas generated inside the battery can 200 of the cylindrical battery cell 10. If it is possible to discharge the flame or gas and shorten the residence time of the flame or gas, the slope of the second slope θ2 of the lower slope 232 may be 0 (zero). That is, if necessary, the lower inclined portion 232 may be formed parallel to the horizontal line.

The first slope θ1 of the upper slope 231 and the second slope θ2 of the lower slope 232 may have different slopes. Here, the first slope (θ1) and the second slope (θ2) are based on the horizontal line and also based on the acute angle. For example, referring to FIG. 3, the first slope (θ1) may be formed to be larger than the second slope (θ2).

In this way, when the first slope θ1 is formed larger than the second slope θ2, not only can flame or gas easily move toward the vent notch 310 by the upper slope 231, but also as shown in FIG. 5 Likewise, the formation of the crimping portion 240 may be facilitated by the lower inclined portion 232. However, it is not necessarily limited to this, and the first slope (θ1) and the second slope (θ2) may be the same, or, if necessary, the first slope (θ1) may be formed to be smaller than the second slope (θ2). It may be possible.

The connection portion 233 connects the upper inclined portion 231 and the lower inclined portion 232. The connection portion 233 may be formed in various ways, but may be formed as a curved surface for smooth movement of flame or gas. However, the shape of the connection portion 233 is not limited to a curved surface.

The crimping portion 240 extends and bends inside the battery can 200 to surround and secure the edge of the cap plate 300 together with the sealing gasket 250. Here, the crimping portion 240 is formed at the lower part of the battery can 200 based on the arrangement state of the battery can 200. For example, when the battery can 200 is arranged so that the cell terminal 500 is located at the top as shown in FIG. 4, the crimping portion 240 is formed at the lower part of the battery can 200 with respect to FIG. 4. And, as shown in FIG. 4, the crimping part 240 is formed at the lower part of the beading part 230. However, this is only one embodiment, and the positions of the crimping part 240 and the beading part 230 are not limited to this.

Based on FIG. 4, when the crimping part 240 is formed at the lower part of the beading part 230, the crimping part 240 is formed to surround the edge of the cap plate 300 disposed at the lower part of the beading part 230. It has an extended and bent shape. The cap plate 300 is fixed on the beading portion 230 by the shape of the folded crimping portion 240.

FIG. 7 is a perspective view showing a cross section of a cylindrical battery cell according to a modified embodiment of FIG. 2.

In the case of FIGS. 2 to 6, the beading portion 230 and the crimping portion 240 are formed at the lower part of the battery can 200, but this is not necessarily limited. Referring to FIG. 7 as a modified example, FIG. As a reference, the beading part 230 and the crimping part 240 may be formed on the upper part of the battery can 200, and the crimping part 240 may be formed on the upper part of the beading part 230.

Referring to FIG. 7 , not only a vent notch 310 may be formed in the cap plate 300 but also a cell terminal 500 may be formed in the cap plate 300 . That is, in the embodiment of FIG. 7, the cap plate 300 may function as a cell terminal 500.

Figure 8 is a diagram showing an inclined beading knife press-fitting a beading portion to manufacture a cylindrical battery cell according to an embodiment of the present invention.

Figure 8 is upside down compared to Figures 2 to 6. That is, in FIGS. 2 to 6, the beading portion 230 is located on the lower side of the battery can 200, but in FIG. 8, the beading portion 230 is positioned to form the beading portion 230 by the beading knife 800. It is shown to be located on the upper side of the battery can 200.

Hereinafter, with reference to FIG. 8, a method of manufacturing a cylindrical battery cell 10 according to an embodiment of the present invention will be described.

With regard to the method of manufacturing the cylindrical battery cell 10 according to an embodiment of the present invention, the content in common with the cylindrical battery cell 10 described above is replaced with the above description. In addition, among the parts described in the method of manufacturing the cylindrical battery cell 10, the content applicable to the cylindrical battery cell 10 may also be applied to the cylindrical battery cell 10.

The method of manufacturing a cylindrical battery cell 10 according to an embodiment of the present invention includes, first, a positive electrode plate 110, a negative electrode plate 120, and a separator 130 interposed between the positive electrode plate 110 and the negative electrode plate 120. The electrode assembly 100 having this structure wound in one direction is inserted into the battery can 200 through the opening 220 of the battery can 200. Here, detailed descriptions of the positive electrode plate 110, the negative electrode plate 120, the separator 130, the electrode assembly 100, and the battery can 200 are replaced with the above description.

Next, a beading portion 230 that is pressed into the inside of the battery can 200 to be inclined at a preset angle is formed in an area adjacent to the opening 220 of the battery can 200. Here, referring to FIG. 8, an inclined beading knife 800 presses into the battery can 200, and thereby the beading portion 230 is pressed inward at a preset angle into the battery can 200. ) can be formed.

Here, the beading knife 800 may be provided with a puncher part 810 that has a shape that matches the inner space of the beading part 230. The puncher unit 810 may have a protruding shape on one side of the body of the beading knife 800 to have a preset upward inclination with respect to the horizontal plane with respect to FIG. 8 . The beading portion 230 may be formed by being press-fitted into the battery can 200 using the puncher portion 810.

Next, the cap plate 300 seals the open portion 220 of the battery can 200. Here, the structure in which the cap plate 300 seals the open portion 220 of the battery can 200 is replaced with the above description.

By this method, a beading portion 230 that is press-fitted into the inside of the battery can 200 and inclined at a preset angle can be formed, thereby facilitating the discharge of flame or gas and reducing the residence time of the flame or gas. It is shortened, and the risk of explosion of the cylindrical battery cell 10 can be reduced.

Figure 9 is a diagram schematically showing the configuration of a battery pack including cylindrical battery cells according to each embodiment of the present invention.

Referring to FIG. 9, the battery pack 20 according to an embodiment of the present invention may include one or more cylindrical battery cells 10 according to an embodiment of the present invention as described above. In addition, the battery pack 20 includes a pack housing 200 for storing the cylindrical battery cells 10, and various devices for controlling charging and discharging of the cylindrical battery cells 10, such as BMS, current sensors, fuses, etc. More may be included.

Figure 10 is a diagram for explaining a vehicle including a battery pack according to each embodiment of the present invention.

Referring to FIG. 10, a vehicle 30 according to an embodiment of the present invention may include one or more cylindrical battery cells 10 or battery packs 20 according to each of the above-described embodiments. Here, the vehicle 30 includes various vehicles designed to use electricity, such as electric vehicles or hybrid vehicles.

In this specification, when terms indicating directions such as up, down, left, and right are used, these terms are only for convenience of explanation, and may vary depending on the location of the object or the location of the observer, etc., as those skilled in the art will understand. It is self-explanatory.

Although the present invention has been described above with limited examples and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the description below will be understood by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalence of the patent claims. 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: Cylindrical battery cell
100: electrode assembly 110: positive plate
120: negative plate 130: separator
140: Center hole 200: Battery can
210: closed portion 211: through hole
220: Opening part 230: Beading part
231: upper slope 232: lower slope
233: connection part 240: crimping part
250: sealing gasket 300: cap plate
310: Bent notch 400: Positive electrode current collector
500: cell terminal 600: insulator
700: negative current collector 800: beading knife
810: Puncher unit
20: Battery pack
200: pack housing
30: car

Claims (15)

An electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction;
a battery can having an opening in which the electrode assembly is accommodated and a closure formed on an opposite side of the opening; and
It includes a cap plate that seals the opening portion of the battery can,
The battery can is a cylindrical battery cell, characterized in that it includes a beading portion that is press-fitted into the inside of the battery can in an area adjacent to the opening and is inclined at a preset angle. According to paragraph 1,
The beading part,
an upper inclined portion formed with a first inclined portion;
a lower slope formed with a second slope; and
A cylindrical battery cell comprising a connection portion connecting the upper inclined portion and the lower inclined portion. According to paragraph 2,
A cylindrical battery cell, wherein the first slope of the upper slope portion and the second slope of the lower slope portion have different slopes. According to paragraph 3,
A cylindrical battery cell, characterized in that the first slope is greater than the second slope. According to paragraph 2,
A cylindrical battery cell, wherein the upper inclined portion and the lower inclined portion are formed to face the opening portion of the battery can. According to clause 5,
The cap plate includes a vent notch that ruptures when the pressure inside the battery can exceeds a critical value,
A cylindrical battery cell, characterized in that the upper inclined portion is formed toward the vent notch so that flame or gas generated inside the battery can moves to the vent notch. According to clause 6,
A cylindrical battery cell, characterized in that the upper slope guides the flame or the gas to move to the vent notch. According to clause 6,
The vent notches are formed on both sides of the cap plate, and are formed in at least one of a continuous circular pattern, a discontinuous circular pattern, and a straight line pattern on the surface of the cap plate. According to clause 6,
The vent notch is formed at the bottom of the battery can based on the arrangement of the battery can, and prevents the flame or gas inside the battery can from being discharged through the bottom of the battery can when the vent notch is ruptured. Characterized by a cylindrical battery cell. According to paragraph 1,
A cylindrical battery cell comprising a sealing gasket interposed between an edge of the cap plate and the open portion of the battery can. According to clause 10,
The battery can is a cylindrical battery cell, characterized in that it includes a crimping part that extends and bends inside the battery can to surround and secure an edge of the cap plate together with the sealing gasket. A battery pack comprising at least one cylindrical battery cell according to any one of claims 1 to 11. A vehicle comprising at least one cylindrical battery cell according to any one of claims 1 to 11. Step of inserting an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive and negative electrode plates are wound in one direction into the battery can through the opening of the battery can:
forming a beading portion press-fitted into the inside of the battery can to be inclined at a preset angle in an area adjacent to the opening; and
A cylindrical battery cell manufacturing method comprising: a cap plate sealing the opening of the battery can. According to clause 14,
A cylindrical battery cell manufacturing method comprising the step of press-fitting the battery can with an inclined beading knife to form the beading portion.

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