Pouch cell assembly

Abstract

The present invention relates to a pouch cell assembly characterized by comprising: a battery cell including an electrode assembly, an electrode lead electrically connected to the electrode assembly, and a battery case which is sealed at the edges and covers the electrode assembly so that the electrode lead is drawn out to the outside; and a clamp unit having a clip shape and inserted into the battery case and fixed to the battery cell, wherein the clamp unit presses the battery case corresponding to a portion from which the electrode lead is drawn out.

Description

Pouch cell assembly

[0001] The present invention relates to a pouch cell assembly.

[0002] The present disclosure claims the benefit of priority based on Korean Patent Application No. 10-2024-0149646 filed October 29, 2024, and all contents of Korean Patent Application No. 10-2024-0149646 are incorporated by reference into the present disclosure.

[0003]

[0004] Rechargeable secondary batteries are attracting attention as a power source for devices requiring high output and large capacity, including electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, which are being proposed as solutions to address air pollution caused by conventional gasoline and diesel vehicles using fossil fuels.

[0005] In terms of battery shape, there is high demand for prismatic and pouch-type rechargeable batteries, which are thin and suitable for applications in products such as mobile phones; in terms of materials, there is high demand for lithium-ion batteries and lithium-ion polymer batteries, which possess advantages such as high energy density, discharge voltage, and output stability.

[0006] Generally, a secondary battery comprises an electrode assembly in which electrodes and separators are alternately stacked, an electrode lead connected to the electrode, a battery case that encloses the electrode assembly so that the electrode lead is exposed to the outside, and an electrolyte filled together with the electrode assembly within the battery case.

[0007] High-temperature gas may be generated inside the secondary battery during the charging and discharging process, and if the gas pressure exceeds the sealing force of the battery case, it may explode.

[0008] Conventionally, methods to supplement the sealing power of the battery case in preparation for such dangerous situations are being sought.

[0009]

[0010] Accordingly, the present invention was devised to solve the above-mentioned problems and aims to provide a pouch cell assembly with a structure capable of reinforcing the sealing portion of a battery case in a thermal propagation (TP) situation.

[0011] In addition, the purpose is to provide a pouch cell assembly with a structure that can intentionally control the discharge direction of high-temperature gases and byproducts generated in a TP (thermal propagation) situation.

[0012] Other objects and advantages of the present invention may be understood from the following description and will become more clearly apparent from the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0013]

[0014] According to the present invention, a pouch cell assembly is provided comprising: an electrode assembly, an electrode lead electrically connected to the electrode assembly, and a battery case covering the electrode assembly and having a sealed edge so that the electrode lead is extended to the outside; and a clamp-type clamp unit fitted into the battery case and fixed to the battery cell, wherein the clamp unit presses the battery case corresponding to the portion where the electrode lead is extended.

[0015] The clamp unit may include: a support plate that supports one side of the battery cell; and a pressure plate that is coupled to the support plate and presses a battery case supported by the support plate through a front portion.

[0016] The battery case comprises: an electrode portion corresponding to the position of the electrode assembly; a lead sealing portion extending from the electrode portion and corresponding to a position that surrounds and seals the electrode lead; and a side sealing portion extending from the lead sealing portion and corresponding to a side position of the electrode assembly; and the clamp unit can be fixed to the lead sealing portion.

[0017] The clamp unit may include a venting portion which is a portion where the pressure of the support plate and the pressure plate is weakened based on the width direction of the battery cell.

[0018] The above battery cell can discharge gas through the venting part when the internal gas pressure exceeds the sealing force of the battery case.

[0019] A heat-resistant elastomer is provided on the surface of the clamp unit, and the elastomer can be coated on the upper part of the support plate and the lower part of the pressure plate.

[0020] The above elastomer may be at least one of fluororubber and silicone rubber.

[0021] The above elastomer may not be coated on the venting portion.

[0022] The clamp unit includes a groove in a portion of the front section of at least one of the pressure plate and the support plate, based on the width direction of the battery cell, and the venting section may be formed in the groove.

[0023] The clamp unit may further include an elastic member that transmits elastic force to the pressure plate so that the front end of the pressure plate presses the upper part of the battery case.

[0024]

[0025] According to the present invention, a pouch cell assembly with a structure that improves safety in a thermal propagation (TP) situation can be provided.

[0026] FIG. 1 is a plan view and a side view of a battery cell of the present invention.

[0027] Figure 2 is a cross-sectional view of a part of the battery cell of Figure 1.

[0028] FIG. 3 is a perspective view of a pouch cell assembly according to a first embodiment of the present invention.

[0029] Figure 4 is a perspective view of the clamp unit of Figure 3.

[0030] Fig. 5 is a front view of the clamp unit of Fig. 3.

[0031] Figure 6 is a plan view of the clamp unit of Figure 3.

[0032] Figure 7 is a modified example of the battery cell of Figure 3.

[0033] FIG. 8 is a perspective view of a modified example of the clamp unit of FIG. 3.

[0034] FIG. 9 is a plan view of a modified example of the clamp unit of FIG. 3.

[0035] FIG. 10 is a perspective view of a pouch cell assembly according to a second embodiment of the present invention.

[0036] FIG. 11 is a front view of a pouch cell assembly according to a second embodiment of the present invention.

[0037] FIG. 12 is a perspective view of a pouch cell assembly according to a third embodiment of the present invention.

[0038] FIG. 13 is a front view of a pouch cell assembly according to a third embodiment of the present invention.

[0039] FIG. 14 is a perspective view of a pouch cell assembly according to a fourth embodiment of the present invention.

[0040] FIG. 15 is a front view of a pouch cell assembly according to a fourth embodiment of the present invention.

[0041] FIG. 16 is a perspective view of a pouch cell assembly according to a fifth embodiment of the present invention.

[0042] FIG. 17 is a front view of a pouch cell assembly according to a fifth embodiment of the present invention.

[0043] FIG. 18 is a perspective view of a pouch cell assembly according to a sixth embodiment of the present invention.

[0044] FIG. 19 is a front view of a pouch cell assembly according to a sixth embodiment of the present invention.

[0045]

[0046] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0047] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0048] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0049] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0050] In describing each drawing, similar reference numerals have been used for similar components. In the attached drawings, the dimensions of the structures are depicted enlarged from their actual size for the clarity of the invention. The terms used to describe the various components are for illustrative purposes only and should not limit the components. The terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the invention, a first component may be named a second component, and similarly, a second component may be named a first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0051]

[0052] Terms such as "comprising" or "having," as used throughout the specification of the present invention, are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0053] Furthermore, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Additionally, in the specification of the present invention, being "placed on" may include cases where it is placed on the lower part as well as the upper part.

[0054]

[0055] The present invention relates to a pouch cell assembly, wherein the pouch cell assembly of the present invention is characterized by controlling the discharge of high-temperature gases and by-products generated during thermal propagation (TP) through a clamp-type clamp unit that is fitted into a battery case and fixed to the battery cell.

[0056] FIGS. 1 to 2 relate to a battery cell of the present invention, FIGS. 3 to 9 relate to a pouch cell assembly according to a first embodiment of the present invention, and FIGS. 10 to 19 relate to second to sixth embodiments of the present invention, respectively.

[0057] Hereinafter, specific embodiments of the pouch cell assembly of the present invention will be described in detail with reference to the attached drawings. For reference, the directions of front, back, up, down, left, and right used to specify relative positions in the following description are intended to aid in understanding the invention, and unless otherwise specifically defined, the directions shown in the drawings are used as the reference.

[0058] (Additionally, the length direction of a configuration is defined as the direction corresponding to the side having the longest length of the configuration shown in the drawing with respect to the horizontal direction, and the width direction of a configuration is defined as the direction perpendicular to the length direction with respect to the horizontal direction.)

[0059]

[0060]

[0061] Pouch cell assembly (1000)

[0062] FIG. 1 is a plan view and a side view of a battery cell (100) of the present invention, and FIG. 2 is a cross-sectional view of a part of the battery cell (100) of FIG. 1.

[0063] The battery cell (100) of the present invention includes an electrode assembly (110) formed by alternately stacking electrodes and separators as shown in FIGS. 1 and 2, an electrode lead (120) electrically connected to the electrode assembly (110), and a battery case (130) that covers the electrode assembly (110) and seals the edges so that the electrode lead (120) is extended to the outside.

[0064] The above battery case (130) can be divided into an electrode portion (131), a lead sealing portion (132), and a side sealing portion (133) depending on the location, as shown in FIG. 1.

[0065] The above electrode part (131) is a part corresponding to the location of the electrode assembly (110).

[0066] The lead sealing portion (132) extends from the electrode portion (131) and is a portion corresponding to a sealed position that surrounds the electrode lead (120).

[0067] The above-mentioned side sealing portion (133) extends from the above-mentioned lead sealing portion (132) and is a portion corresponding to a side position of the electrode assembly (110).

[0068] The lead sealing portion (132) and the side sealing portion (133) are areas where sealing is performed so that the inside of the battery case (130) can be sealed, and are areas where gas can be discharged when the sealing bursts during the TP (thermal propagation) situation of the battery cell (100).

[0069]

[0070] The clamp unit (200) of the present invention is fixed to the battery cell (100) and presses the battery case (130) corresponding to the portion where the electrode lead (120) is protruded.

[0071] Various embodiments of the clamp unit (200) are described below together with FIGS. 3 to 19.

[0072]

[0073] (First embodiment)

[0074] FIG. 3 is a perspective view of a pouch cell assembly (1000) according to a first embodiment of the present invention, FIG. 4 is a perspective view of a clamp unit (200) of FIG. 3, FIG. 5 is a front view of a clamp unit (200) of FIG. 3, and FIG. 6 is a plan view of a clamp unit (200) of FIG. 3.

[0075] The clamp unit (200) of the present invention is coupled with the battery cell (100) as shown in FIG. 3.

[0076] According to some embodiments, the battery cell (100) may have a pair of electrode leads (120) having different polarities on each side, as shown in FIG. 3, and thus only one electrode lead (120) is extended to the clamp unit (200) coupling portion.

[0077] More specifically, the clamp unit (200) is fitted and fixed to the lead sealing portion (132) of the battery cell (100).

[0078] The clamp unit (200) includes a support plate (210) and a pressure plate (220).

[0079] The above support plate (210) serves to support one side of the battery cell (100) and provides a flat bottom surface.

[0080] The support plate (210) supports one side of the battery cell (100) corresponding to the lead sealing portion (132).

[0081] The support plate (210) includes a flat upper surface as shown in FIG. 5, a support portion (211) formed to extend long in one direction on a horizontal plane, and a connecting portion (212) bent upward at both ends of the support portion (211).

[0082] The above pressure plate (220) is coupled to the support plate (210) and presses the other side of the battery cell (100) which is supported on one side by the support plate (210).

[0083] The pressure plate (220) is extended and formed in correspondence with the support portion (211) of the support plate (210), and is coupled to the support plate (210) by being inclined so that its front portion touches the upper surface of the support portion (211).

[0084] The pressure plate (220) is hinged to the support plate (210) so that it can rotate in an arc.

[0085] Specifically, the pressure plate (220) has hinge pins (221) formed protruding on each side, and the hinge pins (221) are hinge-coupled to the connecting part (212) of the support plate (210).

[0086] Accordingly, the pressure plate (220) can reciprocate in an arc around the hinge pin (221).

[0087]

[0088] FIG. 7 is a modified example of the battery cell (100) of FIG. 3.

[0089] According to a modified example, the battery cell (100) may have a pair of electrode leads (120) having different polarities all protruding from one side as shown in FIG. 7, and thus two electrode leads (120) are protruded to the clamp unit (200) coupling portion.

[0090] According to FIGS. 3 and 7, the clamp unit (200) of the present invention can be applied to any standard and shape of pouch-type battery cell (100).

[0091]

[0092] The clamp unit (200) of the present invention maintains a state in which the hinge-coupled pressure plate (220) presses the support plate (210) with a constant pressure. Accordingly, the battery cell (100) interposed between the support plate (210) and the pressure plate (220) is pressed against the support plate (210) and the pressure plate (220) to obtain the effect of being sealed with a constant pressure.

[0093] The above pressure can be transmitted in various ways. For example, the pressing of the pressure plate (220) can be performed through a structure that transmits elastic force.

[0094] Specifically, the clamp unit (200) further includes an elastic member (240) that transmits elastic force to the pressure plate (220) so that the front end of the pressure plate (220) presses the upper part of the battery case (130) in the form shown in FIG. 3 and FIG. 7.

[0095] The elastic member (240) serves to cause the pressure plate (220) and the support plate (210) to be pressed against each other with a force equal to the elastic force. That is, the battery cell (100) is sealed with a force equal to the elastic force of the elastic member (240).

[0096] FIG. 8 is a perspective view of a modified example of the clamp unit (200) of FIG. 3, and FIG. 9 is a plan view of a modified example of the clamp unit (200) of FIG. 3.

[0097] According to FIG. 8, the hinge pin (221) is provided in a shape that penetrates the pressure plate (220), and the spring-shaped elastic member (240) is supported by the hinge pin (221) and transmits elastic force to the pressure plate (220). Through this structure, the elastic member (240) can continuously transmit elastic force to the pressure plate (220) and the support plate (210).

[0098] However, the method of joining and the method of transmitting elastic force of the above elastic member (240) are merely examples, and any structure capable of producing the same effect can be applied.

[0099]

[0100] In the pouch cell assembly (1000) of the present invention, the sealing area of ​​the battery case (130) may burst primarily due to an increase in internal gas pressure during thermal propagation (TP). In particular, the lead sealing portion (132) of the electrode lead (120) protruding area, which has relatively weak sealing, may burst, but it is possible to suppress the release of gas to some extent by the pressure of the clamp unit (200).

[0101]

[0102] (Second embodiment)

[0103] The pouch cell assembly (1000) of the present invention not only supplements the sealing force of the battery case (130) through the clamp unit (200), but also enables control of the discharge direction of gas, flame, and byproducts.

[0104] A pouch cell assembly (1000) according to a second embodiment of the present invention further includes a venting portion (230) capable of intentionally inducing the discharge of gas, etc.

[0105] FIG. 10 is a perspective view of a pouch cell assembly (1000) according to a second embodiment of the present invention, and FIG. 11 is a front view of a pouch cell assembly (1000) according to a second embodiment of the present invention.

[0106] The clamp unit (200) includes a venting portion (230) which is a portion where the pressure of the support plate (210) and the pressure plate (220) is weakened based on the width direction of the battery cell (100) (or the extension direction of the support portion (211)).

[0107] According to FIGS. 10 and 11, the clamp unit (200) includes a groove in the front end of the pressure plate (220), and the venting portion (230) is formed in the groove.

[0108] That is, the venting portion (230) is a part where the pressure plate (220) and the support plate (210) do not come into contact with each other, and therefore, the venting portion (230) is a part where the pressure of the battery cell (100) is weakened.

[0109] Accordingly, when the battery cell (100) explodes due to an increase in internal gas pressure or the like in a TP (thermal propagation) situation, it can discharge gas, etc. to the venting part (230) where the pressure is weakest.

[0110] At this time, the venting portion (230) may be a portion that overlaps with the electrode lead (120), or a portion that does not overlap with the electrode lead (120).

[0111]

[0112] (Third embodiment)

[0113] The pouch cell assembly (1000) of the present invention not only supplements the sealing force of the battery case (130) through the clamp unit (200), but also enables control of the discharge direction of gas, flame, and byproducts.

[0114] The pouch cell assembly (1000) according to the third embodiment of the present invention may form a venting portion (230) in a different way.

[0115] FIG. 12 is a perspective view of a pouch cell assembly (1000) according to a third embodiment of the present invention, and FIG. 13 is a front view of a pouch cell assembly (1000) according to a third embodiment of the present invention.

[0116] The clamp unit (200) includes a venting portion (230) which is a portion where the pressure of the support plate (210) and the pressure plate (220) is weakened based on the width direction of the battery cell (100) (or the extension direction of the support portion (211)).

[0117] According to FIGS. 12 and 13, the clamp unit (200) includes a groove on the upper part of the support plate (210), and the venting portion (230) is formed in the groove.

[0118] That is, the venting portion (230) is a part where the pressure plate (220) and the support plate (210) do not come into contact with each other, and therefore, the venting portion (230) is a part where the pressure of the battery cell (100) is weakened.

[0119] Accordingly, when the battery cell (100) explodes due to an increase in internal gas pressure or the like in a TP (thermal propagation) situation, it can discharge gas, etc. to the venting part (230) where the pressure is weakest.

[0120] At this time, the venting portion (230) may be a portion that overlaps with the electrode lead (120), or a portion that does not overlap with the electrode lead (120).

[0121]

[0122] (Fourth embodiment)

[0123] The pouch cell assembly (1000) of the present invention not only supplements the sealing force of the battery case (130) through the clamp unit (200), but also enables control of the discharge direction of gas, flame, and byproducts.

[0124] The pouch cell assembly (1000) according to the fourth embodiment of the present invention may form a venting portion (230) in a different way.

[0125] FIG. 14 is a perspective view of a pouch cell assembly (1000) according to a fourth embodiment of the present invention, and FIG. 15 is a front view of a pouch cell assembly (1000) according to a fourth embodiment of the present invention.

[0126] The clamp unit (200) includes a venting portion (230) which is a portion where the pressure of the support plate (210) and the pressure plate (220) is weakened based on the width direction of the battery cell (100) (or the extension direction of the support portion (211)).

[0127] According to FIGS. 14 and 15, the clamp unit (200) includes a groove in the front end of the pressure plate (220), and the support plate (210) also includes a groove at a position corresponding to the groove of the pressure plate (220). The venting portion (230) is formed in the grooves of the pressure plate (220) and the support plate (210).

[0128] That is, the venting portion (230) is a part where the pressure plate (220) and the support plate (210) do not come into contact with each other, and therefore, the venting portion (230) is a part where the pressure of the battery cell (100) is weakened.

[0129] Accordingly, when the battery cell (100) explodes due to an increase in internal gas pressure or the like in a TP (thermal propagation) situation, it can discharge gas, etc. to the venting part (230) where the pressure is weakest.

[0130] At this time, the venting portion (230) may be a portion that overlaps with the electrode lead (120), or a portion that does not overlap with the electrode lead (120).

[0131]

[0132] (Fifth embodiment)

[0133] The clamp unit (200) of the present invention may be provided with a heat-resistant elastomer (300).

[0134] FIG. 16 is a perspective view of a pouch cell assembly (1000) according to a fifth embodiment of the present invention, and FIG. 17 is a front view of a pouch cell assembly (1000) according to a fifth embodiment of the present invention.

[0135] As shown in FIGS. 16 and 17, the clamp unit (200) is provided with a heat-resistant elastomer (300) on the surface of the clamp unit (200).

[0136] The above elastomer (300) is coated on the upper part of the support plate (210) and the lower part of the pressure plate (220).

[0137] The above elastomer (300) can be used to increase the frictional force between the battery case (130) and the clamp unit (200), and can also be used to improve the sealing force.

[0138] That is, the above elastomer (300) can help improve adhesion to a battery case (130) with a rough surface due to the property of being compressed when a certain pressure is applied.

[0139] The above elastomer (300) preferably has heat resistance so that damage caused by high-temperature gas and flames, etc., must be minimized.

[0140] The above elastomer (300) is preferably at least one of fluororubber and silicone rubber.

[0141]

[0142] (6th embodiment)

[0143] The clamp unit (200) of the present invention may be provided with a heat-resistant elastomer (300).

[0144] The pouch cell assembly (1000) according to the sixth embodiment of the present invention may form a venting portion (230) in a different way.

[0145] FIG. 18 is a perspective view of a pouch cell assembly (1000) according to a sixth embodiment of the present invention, and FIG. 19 is a front view of a pouch cell assembly (1000) according to a sixth embodiment of the present invention.

[0146] The clamp unit (200) includes a venting portion (230) which is a portion where the pressure of the support plate (210) and the pressure plate (220) is weakened based on the width direction of the battery cell (100) (or the extension direction of the support portion (211)).

[0147] According to FIGS. 18 and 19, the elastomer (300) is coated on the upper part of the support plate (210) and the lower part of the pressure plate (220).

[0148] In the pouch cell assembly (1000) according to the sixth embodiment of the present invention, the elastomer (300) is not coated on a part of at least one of the pressure plate (220) and the support plate (210). That is, the elastomer (300) is not coated on the area where the venting portion (230) is to be formed.

[0149] A groove is formed to a depth that is not coated with the above-mentioned elastomer (300), and the venting portion (230) becomes the groove portion.

[0150] Referring to FIGS. 18 and 19, the clamp unit (200) forms a venting portion (230) by not coating the elastomer (300) to a certain depth on a part of the pressure plate (220). Accordingly, pressure may not be transmitted to the battery cell (100) to the extent that the elastomer (300) is not coated.

[0151] Although not shown, the above elastomer (300) may not be coated on a part of the support plate (210) to form a venting portion (230), or it may not be coated on both the pressure plate (220) and a part of the support plate (210) to form a venting portion (230).

[0152] When the above battery cell (100) explodes due to an increase in internal gas pressure or the like in a TP (thermal propagation) situation, it can discharge gas, etc. to the venting part (230) where the pressure is weakest.

[0153]

[0154] At this time, the venting portion (230) may be a portion that overlaps with the electrode lead (120), or a portion that does not overlap with the electrode lead (120).

[0155]

[0156] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0157]

[0158] [Explanation of the symbol]

[0159] 1000: Pouch cell assembly

[0160] 100: Battery cell

[0161] 110: Electrode assembly

[0162] 120: Electrode lead

[0163] 130: Battery Case

[0164] 131: Electrode part

[0165] 132: Lead sealing part

[0166] 133: Side sealing part

[0167] 200: Clamp unit

[0168] 210: Support plate

[0169] 211: Support

[0170] 212: Connection

[0171] 220: Pressure plate

[0172] 221: Hinge pin

[0173] 230: Venting Department

[0174] 240: Elastic member

[0175] 300: Elastomer

Claims

1. A battery cell comprising an electrode assembly, an electrode lead electrically connected to the electrode assembly, and a battery case covering the electrode assembly and having a sealed rim so as to allow the electrode lead to protrude to the outside; and A clamp-type clamp unit that is fitted into the battery case and fixed to the battery cell; comprising A pouch cell assembly characterized by the clamp unit pressing a battery case corresponding to the portion where the electrode lead is protruded.

2. In Paragraph 1, The above clamp unit is, A support plate supporting one side of the above battery cell; and A pouch cell assembly comprising: a pressure plate combined with the support plate and pressurizing a battery case supported by the support plate through a front portion.

3. In Paragraph 1, The above battery case is, Electrode part corresponding to the position of the electrode assembly; A lead sealing portion extending from the electrode portion and corresponding to a sealed position that surrounds the electrode lead; and A side sealing portion extending from the lead sealing portion and corresponding to a side position of the electrode assembly; comprising The clamp unit above is a pouch cell assembly fixed to the lead sealing portion.

4. In Paragraph 1, The above clamp unit is a pouch cell assembly including a venting portion which is a portion where the pressure of the support plate and the pressure plate is weakened with respect to the width direction of the battery cell.

5. In Paragraph 4, The above battery cell is a pouch cell assembly that discharges gas through the venting portion when the internal gas pressure exceeds the sealing force of the battery case.

6. In Paragraph 4, A heat-resistant elastomer is provided on the surface of the clamp unit, and The above elastomer is a pouch cell assembly coated on the upper part of the support plate and the lower part of the pressure plate.

7. In Paragraph 6, The above elastomer is a pouch cell assembly that is at least one of fluororubber and silicone rubber.

8. In Paragraph 6, The above elastomer is a pouch cell assembly that is not coated on the venting portion.

9. In Paragraph 4, The clamp unit includes a groove in a portion of the front section of at least one of the pressure plate and the support plate, based on the width direction of the battery cell. The above venting portion is a pouch cell assembly formed in the above groove.

10. In Paragraph 1, The above clamp unit is, A pouch cell assembly further comprising: an elastic member that transmits elastic force to the pressure plate so that the front portion of the pressure plate presses the upper portion of the battery case.

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