Battery cell clamp and jig device comprising the same

Abstract

The present disclosure relates to a battery cell gripper clamping a cylindrical battery cell and a jig device including the same, and a battery cell gripper according to an embodiment of the present disclosure includes a gripper clamping a side surface of a cylindrical battery cell and a first direction transfer unit moving the gripper in a first direction to connect bottom surfaces of both sides of the cylindrical battery cell.

Description

Technical Field

[0001] This disclosure relates to a battery cell clamp for holding a cylindrical battery cell when welding an electrode assembly and a current collector included in a cylindrical battery cell, and a fixture device including the battery cell clamp. Background Technology

[0002] Secondary batteries, which are highly adaptable to various product categories and electrical characteristics such as high energy density, have been widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric power sources.

[0003] These secondary batteries have the major advantage of significantly reducing the use of fossil fuels, and also have the advantage of not producing any byproducts from the use of energy, thus standing out as a new energy source for improving environmental friendliness and energy efficiency.

[0004] Currently widely used types of rechargeable batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these rechargeable battery cells (i.e., individual battery cells) is approximately 2.5V to 4.5V. Therefore, when a higher output voltage is required, multiple battery cells can be connected in series to form a battery pack. Furthermore, depending on the required charge / discharge capacity of the battery pack, multiple battery cells can also be connected in parallel to configure the battery pack. Therefore, the number of battery cells included in the battery pack and the type of electrical connection can be variably set according to the required output voltage or charge / discharge capacity.

[0005] Meanwhile, cylindrical, prismatic, and pouch-shaped battery cells are known as types of unit-type secondary battery cells. In the case of a cylindrical battery cell, a separator, acting as an insulator, is sandwiched between the positive and negative electrodes, which are wound together to form a wound-type electrode assembly. This wound-type electrode assembly is then inserted into a battery casing to constitute the battery. Furthermore, a current collector can be connected to the uncoated portion of each of the positive and negative electrodes, and the electrode assembly can be electrically connected to the exposed electrode terminals. For reference, the positive terminal can be a cover plate of a seal that seals the opening of the battery casing, and the negative terminal can be the battery casing itself. However, according to the prior art cylindrical battery cells with this structure, the resistance is high, a large amount of heat is generated, and the current collection efficiency is poor because the current is concentrated on the strip electrode tabs connected to the uncoated portions of the positive or negative electrodes.

[0006] Typically, resistance and heat generation are not major issues for small cylindrical battery cells. However, if the form factor is increased to apply cylindrical battery cells to electric vehicles, there is a possibility that the cylindrical battery cells may ignite due to the large amount of heat generated around the electrode tabs during fast charging.

[0007] To address this issue, a cylindrical battery cell with the following structure has been developed: the uncoated positive electrode portion and the uncoated negative electrode portion are located at the top and bottom of the wound electrode assembly, respectively, and the current collector is welded to these uncoated portions to improve current collection efficiency.

[0008] In this structure, welding the uncoated foil portion and the current collector is necessary. However, since the current collectors welded to the positive electrode side and the current collectors welded to the negative electrode side have different shapes, a welding process suitable for these shapes is required, and if the cylindrical battery cell moves during welding, deviations may occur in the welding angle and welding position. Summary of the Invention

[0009] Technical issues

[0010] Therefore, this disclosure provides a battery cell clamp for stably holding cylindrical battery cells during the welding of electrode assemblies and current collectors.

[0011] In addition, the present invention provides a jig apparatus that includes the battery cell clamp described above.

[0012] However, the technical problems to be solved by this disclosure are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art based on the following description of this disclosure.

[0013] Technical solution

[0014] According to an embodiment of this disclosure, a battery cell clamp for holding a cylindrical battery cell includes: a clamping member that clamps the side of the cylindrical battery cell; and a first direction conveying unit configured to move the clamping member in a first direction connecting the bottom surfaces of the two sides of the cylindrical battery cell.

[0015] The first directional transmission unit may include either a linear motor or a ball screw motor.

[0016] The clamping element may include at least a pair of clamping fingers facing each other across the cylindrical battery cell.

[0017] In addition, a curved clamping recess can be formed in the area where the pair of clamping fingers contact the cylindrical battery cell.

[0018] The clamping recess can be formed in a shape corresponding to the curved surface of the side of the cylindrical battery cell.

[0019] In addition, the battery cell clamp may also include a second direction conveying unit, which adjusts the gap between the pair of clamping fingers.

[0020] The second direction transmission unit may include one of a linear motor or a ball screw motor.

[0021] Additionally, the clamping member may include: a pair of first clamping fingers facing each other across the cylindrical battery cell; and a pair of second clamping fingers spaced apart from the pair of first clamping fingers in the first direction and facing each other across the cylindrical battery cell.

[0022] Additionally, according to embodiments of this disclosure, a jig apparatus for clamping a cylindrical battery cell during the welding of an electrode assembly and a current collector includes: a base; a battery cell jig disposed on the base and clamping the side of the cylindrical battery cell; and one or more welding masks disposed on the base and contacting the bottom surface of at least one side of the cylindrical battery cell, wherein the battery cell jig includes clamping members for clamping the side of the cylindrical battery cell and a first direction conveying unit configured to convey the clamping members in a first direction, such that the bottom surface of at least one side of the cylindrical battery cell can be in close contact with the one or more welding masks.

[0023] The first direction transmission unit of the battery cell clamp may include one of a linear motor or a ball screw motor.

[0024] The clamping element of the battery cell clamp may include at least a pair of clamping fingers facing each other across the cylindrical battery cell.

[0025] A curved clamping recess can be formed in the area where the pair of clamping fingers contact the cylindrical battery cell.

[0026] The clamping recess can be formed in a shape corresponding to the curved surface of the side of the cylindrical battery cell.

[0027] In the fixture device, the battery cell clamp may further include a second direction transmission unit for adjusting the gap between the pair of clamping fingers.

[0028] The second direction transmission unit of the battery cell clamp may include one of a linear motor or a ball screw motor.

[0029] The clamping element of the battery cell clamp may include: a pair of first clamping fingers, the pair of first clamping fingers being opposite each other across the cylindrical battery cell; and a pair of second clamping fingers, the pair of second clamping fingers being spaced apart from the pair of first clamping fingers in the first direction and being opposite each other across the cylindrical battery cell.

[0030] Invention Effects

[0031] According to this disclosure, the cylindrical battery cell can be stably clamped when welding the electrode assembly and the current collector.

[0032] However, the effects that can be obtained through this disclosure are not limited to those described above, and other technical effects not mentioned will be clearly understood by those skilled in the art based on the description of this disclosure given below. Attached Figure Description

[0033] Figure 1 An exemplary form of a cylindrical battery cell held by a battery cell clamp and a fixture device including the battery cell clamp is shown according to an embodiment of the present disclosure.

[0034] Figure 2 This is a diagram illustrating a battery cell clamp and a fixture apparatus including the battery cell clamp according to an embodiment of the present disclosure.

[0035] Figure 3 and Figure 4 It is shown Figure 1 A diagram showing the working state of the battery cell clamp. Detailed Implementation

[0036] The advantages and features of this disclosure, as well as the methods for implementing them, will become apparent from the following detailed description of embodiments in conjunction with the accompanying drawings. However, this disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, and these embodiments are provided merely to make the disclosure complete and to fully inform those skilled in the art of the scope of the invention, which is defined only by the scope of the claims. Therefore, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid ambiguity in interpreting this disclosure. Throughout the specification, the same reference numerals denote the same elements.

[0037] In the accompanying drawings, the thickness of layers, films, plates, regions, etc., is exaggerated for clarity. Therefore, the figures are not drawn to scale. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element (e.g., a layer, film, region, or substrate) is referred to as being "on" another element, it may be directly on the other element, or there may be intermediate elements present. Conversely, when an element is referred to as being "directly on" another element, there are no intermediate elements. Furthermore, it should be understood that when an element (e.g., a layer, film, region, or substrate) is referred to as being "below" another element, it may be directly below the other element, or there may be intermediate elements present. Conversely, when an element is referred to as being "directly under" another element, there are no intermediate elements.

[0038] Throughout this specification, unless otherwise specified, each element may be singular or plural.

[0039] The battery cell clamp 501 and the fixture device 101 including the battery cell clamp 501 according to the embodiments of the present disclosure are designed to stably clamp the cylindrical battery cell 100 when welding the electrode assembly 10 and the current collector 40.

[0040] Before describing the battery cell clamp 501 according to embodiments of the present disclosure and the fixture apparatus 101 including the battery cell clamp 501, reference will be made to... Figure 1 This describes an exemplary form of a battery cell clamp 501 according to an embodiment of the present disclosure and a cylindrical battery cell 100 held by a fixture device 101 including the battery cell clamp 501 when laser welding is used.

[0041] Figure 1 The cylindrical battery cell 100 shown represents an unfinished state during the manufacturing process. For example... Figure 1 As shown, the cylindrical battery cell 100 may include an electrode assembly 10, a battery casing 50, and a current collector 40.

[0042] The electrode assembly 10 can be a core-type electrode assembly, wherein a winding center hole is formed at the center of the core-type electrode assembly.

[0043] The battery housing 50 can be configured to receive the electrode assembly 10 through an opening formed at one end. Furthermore, the battery housing 50 may include a crimping portion 54 formed as a radial recess near an open end.

[0044] The crimping portion 54 can be formed by press-fitting the outer periphery of the battery housing 50, and is formed such that the electrode assembly 10, which can have a size corresponding to the width of the battery housing 50, will not come out from the opening formed at one end of the battery housing 50.

[0045] The current collector 40 may include a negative current collector connected to the uncoated portion of the negative electrode disposed in the negative electrode of the electrode assembly 10 and a positive current collector connected to the uncoated portion of the positive electrode disposed in the positive electrode of the electrode assembly.

[0046] At the same time, Figure 1 The current collector 40 shown as an example is a negative current collector. The current collector 40 can be connected to the end adjacent to the opening of the electrode assembly 10. Furthermore, the current collector 40 can be electrically connected to the battery housing 50. Here, the current collector 40 can be laser-welded to the crimp portion 54 of the battery housing 50.

[0047] In this way, the battery casing 50 connected to the current collector 40 serves as a negative terminal. That is, the battery casing 50 may have the same polarity as the negative terminal of the electrode assembly 10. For this purpose, the battery casing 50 may be formed of a conductive material (e.g., a metal). The material of the battery casing 50 may be formed of a conductive metal (such as aluminum, steel, stainless steel, etc.), but is not limited to this.

[0048] At the same time, Figure 1 The positive current collector plate, not shown, can be connected to the uncoated portion of the positive electrode disposed on the positive electrode of the electrode assembly 10 on the opposite side of the cylindrical battery cell 100 (i.e., at the bottom of the electrode assembly 10).

[0049] The cylindrical battery cell 100 held by the battery cell clamp 501 during the welding process and the fixture device 101 including the battery cell clamp 101 according to the embodiments of the present disclosure have been described. However, the cylindrical battery cell 100 held by the battery cell clamp 501 and the fixture device 101 including the battery cell clamp 101 according to the embodiments of the present disclosure are not necessarily limited to the cylindrical battery cell 100 having the above-described structure.

[0050] See below. Figures 2 to 4 The battery cell clamp 501 and the fixture device 101 including the battery cell clamp 501 according to embodiments of the present disclosure will be described.

[0051] Reference Figure 2 The fixture device 101 includes a base 200, a battery cell clamp 501 according to an embodiment of the present disclosure, and a welding mask 400.

[0052] The base 200 can support the battery cell clamp 501, which will be described below, and the welding mask 400, which will be described below. For example, guide rails can be formed on the base 200 to assist the movement of the second-direction conveying unit 520 of the battery cell clamp 501, which will be described below. That is, the second-direction conveying unit 520 can move in a second direction along the guide rails formed on the base 200. Here, the guide rails can be formed in various shapes and structures known to those skilled in the art to which this disclosure pertains.

[0053] A welding mask 400 is disposed on the base 200 to contact at least one bottom surface of the cylindrical battery cell 100. When a welding process is performed on both bottom surfaces of the cylindrical battery cell 100, the welding mask 400 can be disposed on each bottom surface of the cylindrical battery cell 100. The welding mask 400 is then tightly fitted to one bottom surface of the cylindrical battery cell 100 by a battery cell clamp 501 described below, and thus the welding mask 400 presses the current collector 40 onto the welding area of ​​the electrode assembly 10.

[0054] In this manner, the electrode assembly 10 and current collector 40 of the cylindrical battery cell 100 are fixed using the welding mask 40 and battery cell fixture 501 described below, so that transportation can be performed without the need for a separate loading and unloading process for welding, and on-the-fly welding can be performed quickly and accurately using a laser welding machine in a scanning manner.

[0055] For example, the welding mask 400 may include elongated holes. Furthermore, a laser irradiated from a laser welding machine can be moved in a scanning manner along the length of the elongated holes in the welding mask 400 to perform welding. This laser welding can be performed by partially melting the welding area of ​​the current collector plate 40 or by inserting solder for welding between the current collector plate 40 and the crimping portion 54 of the battery casing 50.

[0056] The battery cell clamp 501 is mounted on the base 200 and clamps the side of the cylindrical battery cell 100.

[0057] Specifically, the battery cell clamp 501 includes a clamping member 550 and a first-direction conveying unit 510. Additionally, the battery cell clamp 501 may also include a second-direction conveying unit 520.

[0058] The clamping member 550 clamps the side of the cylindrical battery cell 100. Specifically, the clamping member 550 may include at least a pair of clamping fingers 551 and 552 opposite each other across the cylindrical battery cell 100.

[0059] Furthermore, curved clamping recesses 5515 and 5525 can be formed in the region where the at least one pair of clamping fingers 551 and 552 contact the cylindrical battery cell 100. In this case, the clamping recesses 5515 and 5525 can be formed in a shape corresponding to the curved surface of the side surface of the cylindrical battery cell 100. For example, the clamping recesses 5515 and 5525 can be formed in a groove shape having a radius of curvature equal to or slightly smaller than the radius of curvature of the curved surface of the side surface of the cylindrical battery cell 100. Here, the radius of curvature of the clamping recesses 5515 and 5525 is formed to be slightly smaller, so that the clamping fingers 551 and 552 can tightly clamp the cylindrical battery cell 100.

[0060] Therefore, the cylindrical battery cell 100 can be clamped by at least a pair of clamping fingers 551 and 552, while a portion of the side of the cylindrical battery cell 100 is accommodated in the clamping recesses 5515 and 5525 of the clamping fingers 551 and 552. That is, at least a pair of clamping fingers 551 and 552 can more stably clamp the cylindrical battery cell 100 with curved surfaces, thereby effectively preventing the cylindrical battery cell 100 from moving during welding.

[0061] Furthermore, in embodiments of this disclosure, depending on the size of the cylindrical battery cell 100, other types of clamping fingers 551 and 552 can be used instead of clamping fingers 551 and 552. For example, if the type of cylindrical battery cell 100 to be clamped by the jig device 101 is changed, clamping fingers 551 and 552 can be replaced by another type of clamping fingers 551 and 552, wherein the radius of curvature of the clamping recesses 5515 and 5525 is equal to the radius of curvature of the curved side of the changed cylindrical battery cell 100.

[0062] Furthermore, the clamping member 550 may include: a pair of first clamping fingers 551, which are opposite each other across the cylindrical battery cell 100; and a pair of second clamping fingers 552, which are spaced apart from the pair of first clamping fingers 551 in a first direction and are opposite each other across the cylindrical battery cell. Therefore, the clamping member 550 can support the sides of the cylindrical battery cell 100 at four locations.

[0063] As described above, since the clamping member 550 supports the sides of the cylindrical battery cell 100 at four points using a pair of first clamping fingers 551 and a pair of second clamping fingers 552, in which clamping recesses 5515 and 5525 are formed, it can prevent the cylindrical battery cell 100 from moving when clamped to the clamping member 550, and can suppress as much as possible the deviation of the welding angle and welding position of the cylindrical battery cell 100 during welding.

[0064] The first-direction conveying unit 510 is configured to move the clamping member 550 in a first direction to connect the bottom surfaces of both sides of the cylindrical battery cell 100. Figure 2 In the image, the arrow indicates the first direction. That is, the first direction conveying unit 510 conveys the clamping member 550 in the first direction, such that at least one bottom surface of the cylindrical battery cell 100 is in close contact with one or more welding masks 400.

[0065] For example, when both bottom surfaces of the cylindrical battery cell 100 are welded, two welding masks 400 can be arranged to contact the two bottom surfaces of the cylindrical battery cell 100 respectively. Furthermore, the first direction conveying unit 510 can convey a clamping member 550 holding the cylindrical battery cell 100 in a direction toward the welding mask 400, the welding mask 400 contacting the bottom surface of the cylindrical battery cell 100 in which welding is performed. That is, the first direction conveying unit 510 can convey the clamping member 550 such that the bottom surface of the cylindrical battery cell 100 is in close contact with the welding mask 400, thereby pressing the welding mask 400 onto the cylindrical battery cell 100.

[0066] For example, the first direction transmission unit 510 of the battery cell clamp 501 may include one of a linear motor or a ball screw motor. However, embodiments of the present disclosure are not limited thereto, and the first direction transmission unit 510 may be formed by various devices known to those skilled in the art to which this disclosure pertains, as long as it is configured to cause the clamp 550 to reciprocate linearly in the first direction.

[0067] According to the above configuration, in the embodiments of this disclosure, the jig device 101 can make the bottom surface of one side of the cylindrical battery cell 100 in close contact with the welding mask 400 by means of the first direction conveying unit 510 included in the battery cell jig 501, without the need to provide a separate pressure device for pressing the welding mask 400 onto the bottom surface of the cylindrical battery cell 100.

[0068] The second-direction transmission unit 520 can adjust the gap between at least one pair of clamping fingers 551 and 552, wherein a cylindrical battery cell 100 is inserted between the clamping fingers 551 and 552. For example, as Figure 3 As shown, when at least one pair of clamping fingers 551 and 552 release their grip on the cylindrical battery cell 100 after the welding process is completed, the second direction conveying unit 520 can widen the gap between the at least one pair of clamping fingers 551 and 552. Furthermore, as... Figure 4 As shown, the second-direction conveying unit 520 can convey at least one pair of clamping fingers 551 and 552 in the second direction to clamp the cylindrical battery cell 100 to be re-welded. Figure 3 and Figure 4 In the middle, the arrow indicates the second direction.

[0069] As an example, the second direction conveying unit 520 of the battery cell clamp 501 may include one of a linear motor or a ball screw motor. However, embodiments of the present disclosure are not limited thereto, and the second direction conveying unit 520 may be formed by various means known to those skilled in the art to which this disclosure pertains, as long as it is configured to adjust the gap between at least one pair of clamping fingers 551 and 552 by causing the clamping fingers 551 and 552 to reciprocate linearly in the second direction.

[0070] Additionally, as described above, a guide rail (not shown) can be formed on the base 200 to assist the movement of the second direction conveying unit 520, and the second direction conveying unit 520 can move in the second direction along the guide rail formed on the base 200.

[0071] With this configuration, according to embodiments of the present disclosure, the cylindrical battery cell 100 can be stably clamped when the electrode assembly 10 and the current collector plate 40 are welded.

[0072] Specifically, the cylindrical battery cell 100 can be clamped by at least a pair of clamping fingers 551 and 552, while a portion of the side of the cylindrical battery cell 100 is accommodated in the clamping recesses 5515 and 5525 of the clamping fingers 551 and 552. That is, at least a pair of clamping fingers 551 and 552 can more stably clamp the cylindrical battery cell 100 with curved surfaces, thereby effectively preventing the cylindrical battery cell 100 from moving during welding.

[0073] Furthermore, since the clamping member 550 of the battery cell clamp 501 supports the side of the cylindrical battery cell 100 at four points using a pair of first clamping fingers 551 and a pair of second clamping fingers 552, which have clamping recesses 5515 and 5525 therein, it can prevent the cylindrical battery cell 100 from moving while being clamped to the clamping member 550, and can suppress the deviation of the welding angle and welding position of the cylindrical battery cell 100 during welding as much as possible.

[0074] In addition, the jig device 101 can make the bottom surface of the cylindrical battery cell 100 in close contact with the welding mask 400 through the first direction conveying unit 510 included in the battery cell clamp 501, without the need for a separate pressing device for pressing the welding mask onto the bottom surface of the cylindrical battery cell 100.

[0075] Although these operations are shown in a specific order in the accompanying drawings, it should not be understood that these operations should be performed in the specific order shown or in a sequential order, or that all the operations shown should be performed to obtain the desired result.

[0076] The above description is merely an example of the technical concept of this embodiment. Those skilled in the art can make various modifications and alterations without departing from the essential characteristics of this embodiment. Therefore, this embodiment is not intended to limit the technical concept of this embodiment, but rather to illustrate it. The scope of the technical concept of this embodiment is not limited to these embodiments. The scope of this embodiment should be interpreted by the following claims, and all technical concepts within the equivalent scope should be interpreted as included within the scope of this embodiment.

[0077] <Explanation of Figure Markers>

[0078] 10: Electrode Assembly

[0079] 40: Current collector

[0080] 50: Battery casing

[0081] 54: Crimping section

[0082] 100: Cylindrical battery cell

[0083] 101: Fixture device

[0084] 200: Base

[0085] 400: Welding mask

[0086] 501: Battery cell clamp

[0087] 510: First Direction Transmission Unit

[0088] 520: Second Directional Transmission Unit

[0089] 550: Clamping component

[0090] 551: First clamping finger

[0091] 552: Second clamping finger

[0092] 5515, 5525: Clamping recess

[0093] Industrial application

[0094] This invention can be used to provide a battery cell clamp for stably clamping cylindrical battery cells during the welding of electrode assemblies and current collectors.

Claims

1. A battery cell clamp for holding cylindrical battery cells, the battery cell clamp comprising: A clamping member that clamps the side of the cylindrical battery cell; as well as A first-direction conveying unit is configured to move the clamping member in a first direction along the bottom surface connecting the two sides of the cylindrical battery cell.

2. The battery cell clamp according to claim 1, wherein, The first directional transmission unit includes either a linear motor or a ball screw motor.

3. The battery cell clamp according to claim 1, wherein, The clamping element includes at least one pair of clamping fingers facing each other across the cylindrical battery cell.

4. The battery cell clamp according to claim 3, wherein, A curved clamping recess is formed in the area where the pair of clamping fingers contact the cylindrical battery cell.

5. The battery cell clamp according to claim 4, wherein, The clamping recess is formed in a shape corresponding to the curved surface of the side of the cylindrical battery cell.

6. The battery cell clamp according to claim 3, wherein the battery cell clamp further comprises a second direction transmission unit for adjusting the gap between the pair of clamping fingers.

7. The battery cell clamp according to claim 6, wherein, The second direction transmission unit includes either a linear motor or a ball screw motor.

8. The battery cell clamp according to claim 1, wherein... The clamping element includes: A pair of first clamping fingers, the pair of first clamping fingers being opposite each other across the cylindrical battery cell; as well as A pair of second clamping fingers, which are spaced apart from the pair of first clamping fingers in the first direction and are opposite to the cylindrical battery cell.

9. A jig apparatus for clamping cylindrical battery cells during the welding of electrode assemblies and current collectors, the jig apparatus comprising: Base; A battery cell clamp is disposed on the base and clamps the side of the cylindrical battery cell; as well as One or more welding masks, said welding masks being disposed on the base and contacting the bottom surface of at least one side of the cylindrical battery cell. The battery cell clamp includes: A clamping member that clamps the side of the cylindrical battery cell; and A first-direction conveying unit is configured to convey the clamping member in a first direction such that the bottom surface of at least one side of the cylindrical battery cell is in close contact with the one or more welding masks.

10. The fixture apparatus according to claim 9, wherein, The first direction transmission unit of the battery cell clamp includes either a linear motor or a ball screw motor.

11. The fixture apparatus according to claim 9, wherein, The clamping element of the battery cell clamp includes at least a pair of clamping fingers facing each other across the cylindrical battery cell.

12. The fixture apparatus according to claim 11, wherein, A curved clamping recess is formed in the area where the pair of clamping fingers contact the cylindrical battery cell.

13. The fixture apparatus according to claim 12, wherein, The clamping recess is formed in a shape corresponding to the curved surface of the side of the cylindrical battery cell.

14. The fixture apparatus according to claim 11, wherein, The battery cell clamp also includes a second direction transmission unit for adjusting the gap between the pair of clamping fingers.

15. The fixture apparatus according to claim 14, wherein, The second direction transmission unit of the battery cell clamp includes either a linear motor or a ball screw motor.

16. The fixture apparatus according to claim 9, wherein, The clamping element of the battery cell clamp includes: A pair of first clamping fingers, the pair of first clamping fingers being opposite each other across the cylindrical battery cell; and A pair of second clamping fingers, which are spaced apart from the pair of first clamping fingers in the first direction and are opposite to the cylindrical battery cell.

Images