Battery cell inspection device

Abstract

Provided is a device for performing an evaluation test on a battery cell including an electrode assembly and a battery case in which the electrode assembly is mounted, according to one embodiment of the present invention. The device comprises a sensor unit facing at least one end of the battery cell, wherein the sensor unit is spaced apart from the one end of the battery cell by a limit height corresponding to a state before a venting phenomenon occurs in the battery cell, and detects whether the one end of the battery cell has swollen to the limit height, and the limit height is a height at which the one end of the battery cell swells immediately before venting due to gas generated inside the battery cell.

Description

Battery cell evaluation device

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0116904, filed August 29, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery cell evaluation device, and more specifically, to a battery cell evaluation device that enables analysis of the inside of a battery cell immediately before venting, while preventing secondary damage by terminating the evaluation test before venting of the battery cell occurs during the evaluation test on the battery cell.

[0004] As technological developments and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. In particular, secondary batteries are attracting significant attention as an energy source not only for mobile devices such as cell phones, digital cameras, laptops, and wearable devices, but also for powertrains such as electric bicycles, electric cars, and hybrid electric vehicles.

[0005] These secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is housed in a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case. Here, the electrode assembly housed in the battery case is a power plant capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive electrode and the negative electrode, and is classified into a jelly-roll type in which a separator is interposed between long sheet-shaped positive and negative electrodes coated with an active material and wound, and a stack type in which a plurality of positive electrodes and negative electrodes are sequentially stacked while interposing the separator between them.

[0006] Among these, pouch-type batteries, which have a structure in which a stack-type or stack / folding-type electrode assembly is built into a pouch-type battery case made of aluminum laminate sheet, are gradually increasing in usage due to reasons such as low manufacturing cost, small weight, and easy deformation.

[0007] During the performance evaluation process for these secondary batteries, venting may occur. Venting refers to the phenomenon in which gas is generated during the decomposition of the electrolyte within the secondary battery, and when the secondary battery swells beyond a critical point due to this gas, the gas is released outside the secondary battery.

[0008] At this time, conventionally, venting alarms and evaluation tests were terminated by recognizing gas emitted from secondary batteries experiencing venting. However, in the case of secondary batteries already experiencing venting, it was difficult to analyze the battery cells in various ways, and secondary damage, such as fire and electrolyte leakage, could occur.

[0009] Accordingly, during the evaluation test on a battery cell, there is a need to develop a battery cell evaluation device that terminates the evaluation test on a secondary battery or alarms the risk of venting before the venting phenomenon of the secondary battery occurs.

[0010] The problem to be solved by the present invention relates to a battery cell evaluation device that enables analysis of the inside of a battery cell just before venting while preventing secondary damage by terminating the evaluation test before venting of the battery cell occurs during the evaluation test on the battery cell.

[0011] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0012] A device for performing an evaluation test on a battery cell including an electrode assembly according to one embodiment of the present invention and a battery case in which the electrode assembly is mounted, the device comprising a sensor unit facing at least one end of the battery cell, the sensor unit being spaced apart from the one end of the battery cell by a limit height before a venting phenomenon occurs in the battery cell, and detecting whether the one end of the battery cell is swollen to the limit height, the limit height being a height at which the one end of the battery cell is swollen just before venting due to a gas generated inside the battery cell.

[0013] The above sensor unit may be a contact-type displacement sensor.

[0014] A spring member is fastened inside the above sensor part, and the sensor part can electrically convert positional displacement information of the spring member.

[0015] The sensor unit may further include a control member that terminates the evaluation of the battery cell or alarms the risk of venting of the battery cell when it detects whether one end of the battery cell is inflated to the limit height.

[0016] The above battery cell includes a sealing portion in which a portion of the outer surface of the battery case is sealed, and the sensor portion can face the sealing portion.

[0017] The battery cell includes at least one electrode tab electrically connected to the electrode assembly, the electrode tab protruding outside the sealing portion, and the sensor portion can face a portion of the sealing portion where the electrode tab is located.

[0018] The above sensor part can face the central area of ​​the part of the sealing part where the electrode tab is located.

[0019] The above sensor part can face an area adjacent to the outside of the sealing part among the parts of the sealing part where the electrode tab is located.

[0020] The above sensor portion includes a plurality of sensors, and the plurality of sensor portions can be arranged at equal intervals in the portion of the sealing portion where the electrode tab is located.

[0021] The battery cell fastening part may further include a battery cell fastening part that fixes one end of the battery cell, and the battery cell fastening part may include a fastening hole into which one end of the battery cell is inserted.

[0022] The sensor unit may include a sensor support unit extending along at least one surface of the battery cell fastening unit, and a venting detection sensor extending from the sensor support unit in a direction facing one end of the battery cell.

[0023] The sensor support portion can be positioned based on the vertical direction of the battery cell fastening portion, and the sensor support portion can be positioned so that the distance between one end of the venting detection sensor and one end of the battery cell is spaced apart by the limit height.

[0024] The sensor unit may include a first sensor unit and a second sensor unit, and the first sensor unit may include a first sensor support unit positioned above the fastening hole and a first venting detection sensor extending from the first sensor support unit in a direction facing the upper surface of one end of the battery cell, and the second sensor unit may include a second sensor support unit positioned below the fastening hole and a second venting detection sensor extending from the second sensor support unit in a direction facing the lower surface of one end of the battery cell.

[0025] The above battery cell fastening part further includes a size adjusting part that adjusts the size of the fastening hole based on the vertical direction of the fastening hole, and the size adjusting part can adjust the size of the fastening hole according to the height of one end of the battery cell.

[0026] The battery cell may further include a chamber in which the battery cell is accommodated, and the sensor unit may be mounted inside the chamber.

[0027] According to embodiments, the battery cell evaluation device of the present invention includes a sensor unit capable of detecting in advance whether a battery cell is vented, so that during the evaluation test on the battery cell, the evaluation test can be terminated before the venting phenomenon of the battery cell occurs, thereby preventing secondary damage, and has the advantage of enabling analysis of the inside of the battery cell just before venting.

[0028] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0029] Fig. 1 is a perspective view showing a battery cell evaluation device according to one embodiment of the present invention.

[0030] FIG. 2 is a drawing showing a battery cell fastening unit and a sensor unit included in the battery cell evaluation device of FIG. 1.

[0031] Fig. 3 is a perspective view showing a battery cell evaluated in the battery cell evaluation device of Fig. 1.

[0032] Fig. 4 is an enlarged drawing showing the sensor unit and the battery cell in the battery cell evaluation device of Fig. 1.

[0033] FIG. 5 is a perspective view showing a battery cell evaluation device according to another embodiment of the present invention.

[0034] FIG. 6 is a drawing showing a battery cell fastening unit and a sensor unit included in the battery cell evaluation device of FIG. 5.

[0035] Fig. 7 is a perspective view showing a battery cell being evaluated in the battery cell evaluation device of Fig. 5.

[0036] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0037] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0038] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0039] Additionally, throughout the specification, whenever a part is said to “include” a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0040] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0041] Hereinafter, a battery cell evaluation device according to an embodiment of the present invention will be described.

[0042] Fig. 1 is a perspective view showing a battery cell evaluation device according to one embodiment of the present invention. Fig. 2 is a drawing showing a battery cell fastening part and a sensor part included in the battery cell evaluation device of Fig. 1. Fig. 3 is a perspective view showing a battery cell being evaluated in the battery cell evaluation device of Fig. 1. Fig. 4 is an enlarged view centered on the sensor part and the battery cell in the battery cell evaluation device of Fig. 1.

[0043] Referring to FIGS. 1 to 4, a battery cell evaluation device (1000) according to one embodiment of the present invention is a device that performs an evaluation test on a battery cell (100) including an electrode assembly and a battery case in which the electrode assembly is mounted.

[0044] Referring to FIG. 3, the battery cell (100) may be a pouch-type battery cell. More specifically, the battery cell (100) may be housed in a battery case (110) in which an electrode assembly (not shown) is formed of a laminated sheet. Here, the main body (111) of the battery cell (100) may be a portion where the electrode assembly (not shown) is positioned. In addition, the battery cell (100) may be manufactured by heat-sealing the sealing portion (115) of the battery case (110) after the electrode assembly (not shown) is housed in the battery case (110). Here, the sealing portion (115) may be formed by sealing a portion of the outer circumferential surface of the battery case (110).

[0045] However, the shape of the battery cell (100) is not limited to this, and battery cells of shapes such as square, cylindrical, etc. may also be included in this embodiment.

[0046] In addition, the battery cell (100) includes at least one electrode tab (120) electrically connected to an electrode assembly (not shown), and at least one electrode tab (120) may protrude outward from at least one end of the battery case (110). For example, as shown in FIG. 3, at least one electrode tab (120) may be positioned in a sealing portion (115) of the battery case (110), and at least one electrode tab (120) may protrude outward from the sealing portion (115).

[0047] Here, at least one electrode tab (120) includes a first electrode tab (121) and a second electrode tab (125), and one of the first electrode tab (121) and the second electrode tab (125) may correspond to a positive electrode tab and the other may correspond to a negative electrode tab.

[0048] For example, as shown in FIG. 3, electrode tabs (120) may protrude toward the outside of the battery cell (100) at each end of the battery cell (100). However, this is not limited thereto, and a case in which multiple electrode tabs (120) are positioned at one end of the battery cell (100) may also be included in the present embodiment.

[0049] Referring to FIG. 1, a battery cell evaluation device (1000) according to the present embodiment includes a sensor unit (1200) facing at least one end of a battery cell (100). In addition, the battery cell evaluation device (1000) further includes a battery cell fastening unit (1100) that secures at least one end of the battery cell (100), and the sensor unit (1200) may be mounted on the battery cell fastening unit (1100).

[0050] Referring to FIGS. 1 and 2, the battery cell fastening portion (1100) may include a fastening hole (1100b) into which one end of the battery cell (100) is inserted. Here, the fastening hole (1100b) may have a size larger than one end of the battery cell (100), and after one end of the battery cell (100) is inserted into the fastening hole (1100b), the size of the fastening hole (1100b) may be adjusted so that the height of the one end of the battery cell (100) is the same as that of the one end of the battery cell (100).

[0051] More specifically, the battery cell fastening part (1100) further includes a size adjusting part (1300) that adjusts the size of the fastening hole (1100b) based on the vertical direction of the fastening hole (1100b), and the size adjusting part (1300) can adjust the size of the fastening hole (1100b) according to the height of one end of the battery cell (100). For example, as shown in FIGS. 1 and 2, a fastening plate (1100a) is arranged on the upper portion of the fastening hole (1100b), and the position of the fastening plate (1100a) in the vertical direction of the fastening hole (1100b) can be adjusted according to the rotation of the size adjusting part (1300).

[0052] Referring to FIGS. 1 and 2, the sensor unit (1200) may include a sensor support unit (1211, 1221) extending along at least one surface of the battery cell fastening unit (1100), and a venting detection sensor (1215, 1225) extending from the sensor support unit (1211, 1221) in a direction facing one end of the battery cell (100).

[0053] More specifically, as shown in FIGS. 1 and 2, the sensor support (1211, 1221) may extend along one side of the battery cell fastening portion (1100) facing the battery cell (100) and both sides connected to the one side. However, the present invention is not limited thereto, and the sensor support (1211, 1221) may extend along the front surface of the battery cell fastening portion (1100).

[0054] Accordingly, in the battery cell evaluation device (1000) according to the present embodiment, the sensor unit (1200) can be stably fixed to the battery cell fastening unit (1100) through the sensor support unit (1211, 1221).

[0055] In addition, the sensor support (1211, 1221) can be positioned based on the vertical direction of the battery cell fastening portion (1100). More specifically, as described later in FIG. 4, the sensor support (1211, 1221) can be positioned so that the distance between one end of the venting detection sensor (1215, 1225) and one end of the battery cell (100) is spaced apart by a limit height (h1, h2).

[0056] Accordingly, in the battery cell evaluation device (1000) according to the present embodiment, the sensor unit (1200) can easily adjust the distance between one end of the venting detection sensor (1215, 1225) and one end of the battery cell (100) without additional parts by adjusting the position of the sensor support unit (1211, 1221).

[0057] In addition, the sensor unit (1200) may include a plurality of sensor units (1200). For example, as shown in FIGS. 1 and 2, the sensor unit (1200) includes a first sensor unit (1210) and a second sensor unit (1220), and the first sensor unit (1210) may be positioned above one end of the battery cell (100), and the second sensor unit (1220) may be positioned below one end of the battery cell (100). In other words, the first sensor unit (1210) may be positioned above the fastening hole (1100b), and the second sensor unit (1220) may be positioned below the fastening hole (1100b).

[0058] More specifically, the first sensor unit (1210) may include a first sensor support unit (1211) positioned above the fastening hole (1100b) and a first venting detection sensor (1215) extending from the first sensor support unit (1211) in a direction facing the upper surface of one end of the battery cell (100). In addition, the second sensor unit (1220) may include a second sensor support unit (1221) positioned below the fastening hole (1100b) and a second venting detection sensor (1225) extending from the second sensor support unit (1221) in a direction facing the lower surface of one end of the battery cell (100).

[0059] Accordingly, in the battery cell evaluation device (1000) according to the present embodiment, the sensor unit (1200) can be positioned at the upper and lower portions of one end of the battery cell (100), respectively, so that it is possible to effectively detect in advance whether one end of the battery cell (100) is vented.

[0060] However, in the battery cell evaluation device (1000) according to the present embodiment, the number and position of the sensor units (1200) are not limited thereto, and an embodiment in which one of the first sensor unit (1210) and the second sensor unit (1220) is omitted may also be included in the present embodiment.

[0061] Although not shown in FIGS. 1 and 2, a battery cell evaluation device (1000) according to another embodiment may have the battery cell fastening portion (1100) replaced with a chamber (not shown) in which the battery cell (100) is accommodated, and the sensor portion (1200) may be mounted inside the chamber (not shown).

[0062] Referring to FIGS. 1 and 2, the battery cell evaluation device (1000) according to the present embodiment has a sensor unit (1200) that can face at least one end of the battery cell (100). More specifically, a venting detection sensor (1215, 1225) included in the sensor unit (1200) can face at least one end of the battery cell (100). That is, one end of the venting detection sensor (1215, 1225) can face at least one end of the battery cell (100). Hereinafter, for convenience of explanation, the venting detection sensor (1215, 1225) will be described as the sensor unit (1200).

[0063] More specifically, the sensor unit (1200) may face an area in the battery cell (100) where there is a high risk of venting occurring. In other words, the sensor unit (1200) may face an area in the battery cell (100) that is vulnerable to venting.

[0064] For example, as shown in FIGS. 1 and 2, the sensor unit (1200) may face the sealing unit (115) formed at least at one end of the battery case (110). In particular, the sensor unit (1200) may face the portion of the sealing unit (115) where the electrode tab (120) is located, and this portion may be indicated as a sensor facing portion (115m) as shown in FIG. 2. For example, as shown in the sensor facing portion (115m) in FIG. 2, the sensor unit (1200) may face the central region of the portion of the sealing unit (115) where the electrode tab (120) is located.

[0065] This is because the sealing strength of the sealing portion (115) where the electrode tab (120) is located is relatively weaker than that of the sealing portion (115) where the electrode tab (120) is not located, and the sealing portion (115) where the electrode tab (120) is located is an area where there is a high risk of a venting phenomenon occurring or is vulnerable to the venting phenomenon.

[0066] For example, the sensor unit (1200) may face an area (d) adjacent to the outside of the sealing unit (115) among the portions of the sealing unit (115) where the electrode tab (120) is located. This is because the area (d) adjacent to the outside of the sealing unit (115) among the portions of the sealing unit (115) where the electrode tab (120) is located corresponds to a position where the sealing unit (115) is ruptured when a venting phenomenon occurs.

[0067] Accordingly, the battery cell evaluation device (1000) according to the present embodiment has an advantage in that it can effectively detect in advance whether a venting phenomenon has occurred in the battery cell (100) when the sensor unit (1200) faces an area in the battery cell (100) where there is a high risk of a venting phenomenon occurring or where the venting phenomenon is vulnerable.

[0068] Here, the sensor unit (1200) may be a contact-type displacement sensor. For example, the sensor unit (1200) may have a spring member (not shown) fastened to the inside of the sensor unit (1200), and the sensor unit (1200) may electrically convert positional displacement information of the spring member (not shown). However, the present invention is not limited thereto, and a commonly used contact-type displacement sensor may also be included in the present embodiment.

[0069] Referring to FIGS. 1, 2, and 4, the first sensor unit (1210) may be spaced apart from the upper portion of one end of the battery cell (100) by a first limit height (h1) before a venting phenomenon occurs in the battery cell (100). For example, as described above, the first sensor unit (1210) may be spaced apart from the sealing unit (115) formed at one end of the battery cell (100) by a first limit height (h1) before a venting phenomenon occurs in the battery cell (100). More specifically, the first limit height (h1) is the height at which one end of the battery cell (100) is swollen just before venting due to gas generated inside the battery cell (100).

[0070] In addition, the first sensor unit (1210) can detect whether the upper portion of one end of the battery cell (100) is inflated to the first limit height (h1). For example, the first sensor unit (1210) can detect whether the upper portion of the sealing portion (115) formed at one end of the battery cell (100) is inflated to the first limit height (h1). More specifically, as the one end of the battery cell (100) is inflated due to gas generated inside the battery cell (100), the first sensor unit (1210) and the upper portion of the one end of the battery cell (100) come into contact with each other, thereby detecting whether the upper portion of the one end of the battery cell (100) is inflated to the first limit height (h1).

[0071] The battery cell evaluation device (1000) according to the present embodiment may further include a control member (not shown) that terminates the evaluation of the battery cell (100) or alarms the risk of venting of the battery cell (100) when the first sensor member (1210) detects whether the upper portion of one end of the battery cell (100) is inflated to the first limit height (h1).

[0072] Accordingly, the battery cell evaluation device (1000) according to the present embodiment has an advantage in that the first sensor unit (1210) can detect the first limit height (h1) just before the upper part of one end of the battery cell (100) is vented, thereby inducing the termination of the evaluation test before the venting phenomenon of the battery cell (100) occurs during the evaluation test on the battery cell (100), thereby preventing secondary damage such as electrolyte leakage contamination or ignition of adjacent battery cells or equipment. In addition, since the evaluation test is terminated before the venting phenomenon of the battery cell (100) occurs, there is an advantage in that additional analysis of the inside of the battery cell just before venting becomes possible.

[0073] Although the above description has been centered on the first sensor unit (1210), the second sensor unit (1220) may be described in the same manner as the first sensor unit (1210) with only a difference in position. In addition, unlike FIGS. 1, 2, and 4, an embodiment in which one of the first sensor unit (1210) and the second sensor unit (1220) is omitted may also be included in the present embodiment.

[0074] Fig. 5 is a perspective view showing a battery cell evaluation device according to another embodiment of the present invention. Fig. 6 is a drawing showing a battery cell fastening part and a sensor part included in the battery cell evaluation device of Fig. 5. Fig. 7 is a perspective view showing a battery cell being evaluated in the battery cell evaluation device of Fig. 5.

[0075] The battery cell evaluation device (2000) according to the present embodiment can be described mostly in the same way as the battery cell evaluation device (1000) described above, and only the different parts will be described below.

[0076] In the battery cell evaluation device (2000) according to the present embodiment, the sensor unit (2200) may include a plurality of venting detection sensors (2211, 2221). For example, as shown in FIGS. 5 and 6 , the plurality of venting detection sensors (2211, 2221) may be arranged at equal intervals in the portion of the sealing unit (215) where the electrode tabs (220) are located. However, the number and intervals of the plurality of venting detection sensors (2211, 2221) are not limited thereto and may be appropriately changed as needed.

[0077] Accordingly, the battery cell evaluation device (2000) according to the present embodiment has an advantage in that it can more precisely detect the limit height (h1, h2) just before one end of the battery cell (100) is vented, as the plurality of venting detection sensors (2211, 2221) included in the sensor unit (2200) face the sealing unit (215) of the battery cell (100) at a constant interval.

[0078] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0079] [Explanation of symbols]

[0080] 100: Battery cell

[0081] 110: Battery case

[0082] 111: Main body

[0083] 115: Sealing part

[0084] 115m: Sensor facing area

[0085] 120: Electrode tab

[0086] 121: First electrode tab

[0087] 125: Second electrode tab

[0088] 1000: Battery cell evaluation device

[0089] 1100: Battery cell fastening part

[0090] 1200: Sensor section

[0091] 1211, 1221: Sensor support

[0092] 1215, 1225: Venting detection sensor

[0093] 1300: Size adjustment section

Claims

1. A device for conducting an evaluation test on a battery cell including an electrode assembly and a battery case in which the electrode assembly is mounted. Including a sensor unit facing at least one end of the above battery cell, The sensor unit is spaced apart from one end of the battery cell by a limit height before a venting phenomenon occurs in the battery cell, and detects whether one end of the battery cell is inflated to the limit height. A battery cell evaluation device wherein the above limit height is the height at which one end of the battery cell swells just before venting due to gas generated inside the battery cell.

2. In paragraph 1, The above sensor unit is a battery cell evaluation device that is a contact-type displacement sensor.

3. In paragraph 2, A spring member is attached to the inside of the above sensor part, The above sensor unit is a battery cell evaluation device that electrically converts positional displacement information of the spring member.

4. In paragraph 1, A battery cell evaluation device further comprising a control member that terminates evaluation of the battery cell or alarms for a venting risk of the battery cell when the sensor unit detects whether one end of the battery cell is inflated to the limit height.

5. In paragraph 1, The above battery cell includes a sealing portion in which a portion of the outer surface of the battery case is sealed, The above sensor part is a battery cell evaluation device facing the above sealing part.

6. In paragraph 5, The battery cell includes at least one electrode tab electrically connected to the electrode assembly, the electrode tab protruding outside the sealing portion, A battery cell evaluation device in which the sensor portion faces the portion of the sealing portion where the electrode tab is located.

7. In paragraph 6, A battery cell evaluation device in which the sensor portion faces the central area of ​​the portion of the sealing portion where the electrode tab is located.

8. In paragraph 6, A battery cell evaluation device in which the sensor portion faces an area adjacent to the outer side of the sealing portion among the portions of the sealing portion where the electrode tab is located.

9. In paragraph 6, A battery cell evaluation device including a plurality of the above sensor parts, wherein the plurality of the above sensor parts are arranged at equal intervals in the portion of the sealing part where the electrode tab is located.

10. In paragraph 1, Further comprising a battery cell fastening member that fixes one end of the above battery cell, A battery cell evaluation device in which the above battery cell fastening part includes a fastening hole into which one end of the battery cell is inserted.

11. In paragraph 10, A battery cell evaluation device including a sensor support portion extending along at least one surface of the battery cell fastening portion, and a venting detection sensor extending from the sensor support portion in a direction facing one end of the battery cell.

12. In paragraph 11, The above sensor support is positioned based on the vertical direction of the battery cell fastening portion, A battery cell evaluation device in which the sensor support is positioned so that the distance between one end of the venting detection sensor and one end of the battery cell is spaced apart by the limit height.

13. In paragraph 11, The above sensor unit includes a first sensor unit and a second sensor unit, The first sensor part includes a first sensor support part located at the upper portion of the fastening hole and a first venting detection sensor extending from the first sensor support part in a direction facing the upper surface of one end of the battery cell, A battery cell evaluation device, wherein the second sensor unit includes a second sensor support unit located at the lower portion of the fastening hole and a second venting detection sensor extending from the second sensor support unit in a direction facing the lower surface of one end of the battery cell.

14. In paragraph 10, The above battery cell fastening part further includes a size adjusting part that adjusts the size of the fastening hole based on the up-down direction of the fastening hole, The above size adjustment unit is a battery cell evaluation device that adjusts the size of the fastening hole according to the height of one end of the battery cell.

15. In paragraph 1, Further comprising a chamber in which the above battery cell is accommodated, The above sensor unit is a battery cell evaluation device mounted inside the chamber.

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