Method for manufacturing secondary battery

Abstract

The present invention relates to an apparatus and a method for manufacturing a secondary battery, and more particularly, to an apparatus and a method for manufacturing a secondary battery capable of effectively performing degassing and enhancing impregnation with respect to an electrolyte. According to one embodiment of the present invention, there may be provided a method for manufacturing a secondary battery, the method comprising: a filling step of filling a battery case with an electrolyte solution; an insertion step of inserting the electrode assembly into the battery case; and a degassing step of connecting an adapter to the electrode assembly, transmitting excitation of the adapter to the electrode assembly, and exciting the electrolyte through the electrode assembly to degas the electrolyte.

Description

Technical Field

[0001] This invention relates to a secondary battery manufacturing apparatus and a secondary battery manufacturing method, and more specifically, to a secondary battery manufacturing apparatus and a secondary battery manufacturing method capable of effectively improving the impregnation performance and degassing the electrolyte. Background Technology

[0002] Typically, with the increasing availability of portable small electrical and electronic devices, the development of new rechargeable batteries, such as nickel-metal hydride batteries or lithium-ion batteries, is actively underway. In recent years, lithium-ion batteries have been widely used in automobiles and power tools.

[0003] Lithium-ion batteries are batteries that use carbon, such as graphite, as the negative electrode active material, lithium oxide as the positive electrode material, and non-aqueous solvents as the electrolyte.

[0004] This type of secondary battery is manufactured in the form of a battery assembly by housing an electrode assembly, in which the positive electrode, separator, and negative electrode are sequentially measured in an external material (i.e., the battery casing such as a bag or cylindrical can). Afterward, a process is performed to inject electrolyte into the battery assembly using an electrolyte injection device. This process is commonly referred to as the encapsulation process.

[0005] During the encapsulation process, after electrolyte injection, the diaphragm must be fully impregnated so that the electrolyte can adequately fill the spaces between the electrodes. However, electrolyte bubbles may be generated and remain during the electrolyte injection process, and these residual bubbles can also lead to a decrease in electrolyte impregnation performance.

[0006] In some cases, vacuum or pressure is used during the packaging process to remove these residual bubbles, but even so, bubbles may still remain.

[0007] Residual air bubbles can lead to decreased battery performance and increase the amount of gas generated inside the battery casing.

[0008] Therefore, traditionally, excessively long processing times are required to remove bubbles from the electrolyte, which inevitably increases manufacturing costs. Summary of the Invention

[0009] Technical issues

[0010] The present invention aims to solve the above-mentioned problems of traditional secondary battery manufacturing methods.

[0011] Through one example of the present invention, an apparatus and method are intended to be provided that can effectively improve the impregnation rate and the degree of impregnation.

[0012] Through one example of the present invention, an apparatus and method are intended to be provided that can effectively improve the degassing rate and the degree of degassing.

[0013] Through one example of the present invention, an apparatus and method are intended to be provided that can more effectively remove residual bubbles and gases while using a mesh filter to prevent damage to the electrode assembly.

[0014] By way of an example of the present invention, an apparatus and method are intended to be provided that can effectively reduce the possibility of subsequent internal gas generation in the battery and significantly improve its lifespan and stability by significantly reducing the time required for the packaging process and by reducing residual gas.

[0015] Technical solution

[0016] To achieve the above objectives, according to an example of the present invention, a method for manufacturing a secondary battery can be provided, the method comprising the following steps: a filling step, wherein the filling step fills an electrolyte into a battery casing; an insertion step, wherein the insertion step inserts an electrode assembly into the interior of the battery casing; and a degassing step, wherein the degassing step connects an adapter to the electrode assembly, transmits excitation from the adapter to the electrode assembly, and excites the electrolyte through the electrode assembly to remove gas.

[0017] In the degassing process, an excitation is applied to the electrode assembly. This excitation of the electrode assembly is then transferred to the surrounding electrolyte, thereby also exciting the electrolyte. In this way, the contact area between the electrolyte and the electrode assembly can be increased, resulting in smoother and more efficient degassing.

[0018] Preferably, after the degassing process, a vacuum process is performed, which provides a vacuum environment for the battery casing and the electrode assembly to remove residual gases.

[0019] The excitation applied to the adapter can be performed at an ultrasonic excitation frequency or a megason excitation frequency.

[0020] Preferably, the battery casing is positioned with its opening facing upwards before the filling and degassing processes are performed. This allows the electrolyte to be easily injected into the casing and enables more efficient degassing.

[0021] The electrode assembly can be inserted and positioned in the battery housing with a shared clamp mounted on it.

[0022] The shared clamp can be located at the bottom of the opening or positioned by protruding to the top of the opening. Furthermore, preferably, the electrode assembly and adapter are connected via the shared clamp.

[0023] A shared clamp can be referred to as a clamp that holds part of the electrode assembly, and it can be formed of a soft material to prevent damage to the electrode assembly.

[0024] An adapter is a configuration that connects to a shared fixture to indirectly hold the electrode assembly, and it can be a configuration subjected to direct excitation. Therefore, damage to the electrode assembly due to excitation by the adapter can be prevented.

[0025] Preferably, the degassing process is performed with the mesh filter surrounding the electrode assembly inside the battery casing. The mesh filter serves to capture air bubbles inside the electrolyte.

[0026] After the degassing process, the mesh filter is removed from the battery casing, allowing the trapped air bubbles to be smoothly discharged to the outside. Therefore, degassing can be achieved more effectively through the mesh filter.

[0027] The mesh filter may be inserted into the interior of the battery housing together with the electrode assembly; or the mesh filter may be inserted into the interior of the battery housing, and then the electrode assembly may be inserted into the interior of the battery housing.

[0028] The insertion process can be performed after the filling process, or the filling process can be performed after the insertion process.

[0029] The method may further include an impregnation process, wherein the impregnation process connects the adapter to the electrode assembly, transmits the motion of the adapter to the electrode assembly, and agitates the electrolyte through the electrode assembly to improve the impregnation performance of the electrolyte on the electrode assembly.

[0030] Preferably, the degassing process is performed after the impregnation process.

[0031] The motion of the adapter can include translational motion and rotational motion.

[0032] The adapter may include: a stirring adapter for stirring the electrode assembly; and an excitation adapter disposed separately from the stirring adapter for exciting the electrode assembly.

[0033] The adapter of the stirring device is directly connected to the electrode assembly, or connected to the electrode assembly via a shared clamp, so that the electrode assembly can stir the electrolyte through the stirring of the adapter.

[0034] The adapter of the excitation device is directly connected to the electrode assembly, or connected to the electrode assembly via a shared clamp, so that the electrode assembly and electrolyte can be excited by the excitation of the adapter.

[0035] To achieve the above objectives, according to an example of the present invention, a method for manufacturing a secondary battery can be provided, the method comprising the following steps: a filling step, wherein the filling step fills an electrolyte into a battery casing; an insertion step, wherein the insertion step inserts an electrode assembly into the interior of the battery casing; and an impregnation step, wherein the impregnation step connects an adapter to the electrode assembly, transmits the movement of the adapter to the electrode assembly, and agitates the electrolyte through the electrode assembly to improve the impregnation performance of the electrolyte on the electrode assembly.

[0036] The insertion process can be performed after the filling process, or the filling process can be performed after the insertion process.

[0037] The method may further include the following steps: a degassing step, wherein the degassing step connects the adapter to the electrode assembly, transmits the excitation of the adapter to the electrode assembly, and excites the electrolyte through the electrode assembly to remove gas; and a vacuum step, wherein the vacuum step provides a vacuum environment for the battery housing and the electrode assembly to remove residual gas.

[0038] To achieve the above objectives, according to an example of the present invention, a method for manufacturing a secondary battery can be provided, the method comprising the following steps: a filling step, wherein the filling step fills an electrolyte into a battery casing; an insertion step, wherein the insertion step inserts an electrode assembly from the outside of the battery casing into the battery casing; an impregnation step, wherein the impregnation step connects an adapter to the electrode assembly, transmits the motion of the adapter to the electrode assembly, and agitates the electrolyte through the electrode assembly to improve the impregnation performance of the electrolyte on the electrode assembly; and a degassing step, wherein the degassing step connects an adapter to the electrode assembly, transmits the excitation of the adapter to the electrode assembly, and excites the electrolyte through the electrode assembly to remove gas.

[0039] After the degassing process, a vacuum process can be performed to provide a vacuum environment for the battery casing and electrode assembly to remove residual gases.

[0040] The excitation applied to the adapter can be performed at ultrasonic or megason frequencies.

[0041] Preferably, the adapter's movement consists of translational and rotational motions. This allows for the stirring of the electrolyte while the electrode assembly performs translational and rotational movements within the battery compartment.

[0042] The adapter may include: a stirring adapter for stirring the electrode assembly; and an excitation adapter disposed separately from the stirring adapter for exciting the electrode assembly.

[0043] The electrode assembly can be inserted into the battery housing with the shared clamp mounted on top.

[0044] The electrode assembly and adapter can be connected via a shared clamp.

[0045] During the filling process, a mesh filter can be introduced into the interior of the battery housing, so that during the insertion process, the mesh filter surrounds the introduced electrode assembly.

[0046] A mesh filter can be introduced before filling the electrolyte.

[0047] In the filling process, electrolyte can be filled inside the battery housing with the introduced mesh filter, so that in the insertion process, the mesh filter surrounds the introduced electrode assembly.

[0048] Preferably, the mesh filter is removed from the battery housing after the degassing process. Removal of the mesh filter can be easily performed by pulling one end of the mesh filter near the upper opening of the battery housing.

[0049] Beneficial effects

[0050] An example of the present invention provides an apparatus and method that can effectively improve the impregnation rate and the degree of impregnation.

[0051] An example of the present invention provides an apparatus and method that can effectively improve the degassing rate and the degree of degassing.

[0052] An example of the present invention provides an apparatus and method for more effectively removing residual bubbles and gases while using a mesh filter to prevent damage to the electrode assembly.

[0053] An example of the present invention provides an apparatus and method that, by significantly reducing the time required for the packaging process while substantially reducing residual gas, can effectively reduce the likelihood of subsequent gas generation inside the battery and significantly improve its lifespan and stability. Attached Figure Description

[0054] Figure 1 This shows the state of the battery casing filled with electrolyte.

[0055] Figure 2 The image shows the electrode assembly inserted into the battery casing.

[0056] Figure 3 The state of the electrode assembly stirring the electrolyte is shown.

[0057] Figure 4 The state of vibration of the electrode assembly is shown.

[0058] Figure 5 This shows the state after degassing is complete.

[0059] Figure 6 The process of a manufacturing method according to an example of the present invention is shown. Detailed Implementation

[0060] In the following, a manufacturing apparatus and manufacturing method according to an example of the present invention will be described in detail with reference to the accompanying drawings.

[0061] Figure 1 The image shows the state of the battery casing filled with electrolyte, and Figure 2 The image shows the electrode assembly inserted into the battery casing.

[0062] In the packaging process of secondary batteries, the manufactured electrode assembly is usually introduced into the battery casing first, and then the electrolyte is injected.

[0063] In this example, the electrolyte can be injected into the battery housing (10) first, and then the electrode assembly (20) can be introduced into the battery housing (10); conversely, the electrolyte can be injected after the electrode assembly is introduced into the battery housing (10).

[0064] The introduction of electrolyte and electrode assembly can be performed through an opening provided at the top of the battery housing (10).

[0065] Depending on the shape of the battery housing (10), the process of introducing the electrode assembly into the battery housing (10) may vary.

[0066] As an example, in the case of a rectangular or cylindrical housing, an opening can be formed in the housing, and an electrode assembly can be introduced through the opening. In this case, the electrolyte can be injected through the opening before or after the introduction of the electrode assembly.

[0067] As an example, in the case of a pouch-type housing, an opening can be formed by connecting the pouch-type housing to the electrode assembly. In this case, introducing the electrode assembly into the housing means that the assembly process of the electrode assembly and the housing, as well as the opening-forming process of the housing, are performed together. Therefore, electrolyte can be injected through the opening after the electrode assembly is introduced.

[0068] In secondary batteries, the amount of electrolyte to be filled into the battery casing can be predetermined through design and verification processes. The amount of electrolyte can be 5% to 90% of the height of the electrode assembly (20), and it is preferably 20% to 80%.

[0069] Since the electrode assembly (20) itself has a volume that fills most of the interior of the battery casing (10), the filling rate is inevitably slow when the electrolyte is filled after the electrode assembly (20) is introduced. On the other hand, when the electrolyte is filled before the electrode assembly (20) is introduced, a certain amount of electrolyte can be filled relatively quickly.

[0070] The electrodes and diaphragm of the electrode assembly (20) must be fully immersed in the electrolyte, and specifically, the degree of immersion of the diaphragm is very important. That is, preferably, the entire diaphragm is fully immersed in the electrolyte.

[0071] When electrolyte is introduced after electrode assembly (20), the degree of impregnation may increase over time, but some parts of the separator may not be adequately impregnated. Furthermore, when electrolyte is introduced after electrode assembly (20), the amount of bubble generation may be relatively large. This is because, with the introduction of electrolyte, the area where electrolyte contacts the inner surface of the battery casing narrows, resulting in more energy generated due to collisions, thus increasing gas emission and generating more bubbles. Therefore, in this example, it is preferable to first introduce electrolyte (30) into the battery casing (10), and then introduce electrode assembly (20) into the battery casing (10). However, depending on the overall process efficiency (especially the shape of the casing), electrolyte injection may also be performed after the introduction of electrode assembly.

[0072] According to this example, kinetic energy is preferably actively applied to the electrode assembly (20) to increase the impregnation rate and extent.

[0073] Figure 2 An example is shown of an electrode assembly (20) being introduced into a battery housing (10) while connected to a shared clamp (50).

[0074] A shared clamp (50) can be attached to and provided to the upper part of the electrode assembly (20). The shared clamp (50) can be provided in the form of pliers. The shared clamp (50) can be attached to the electrode assembly (20) after the electrode assembly (20) has been manufactured, and then the electrode assembly (20) with the shared clamp (50) attached is introduced into the battery housing (10). Of course, the shared clamp (50) can also be attached to the upper part of the electrode assembly (20) after the electrode assembly (20) has been introduced into the battery housing (10).

[0075] The shared clamp (50) can be described as a clamp that holds the electrode assembly (20) by simultaneously applying pressure to one side and the opposite side of the electrode assembly (20). Therefore, preferably, in order to prevent damage to the surface of the electrode assembly (20), the shared clamp (50) is formed of a soft material or a plastic material. In particular, preferably, the portion in contact with the surface of the electrode assembly (20) is formed of a plastic material.

[0076] like Figure 3 As shown, preferably, the electrode assembly (20) is configured to move actively inside the battery housing (10). Specifically, the electrode assembly (20) can rotate within the battery housing (10) to stir the electrolyte (30). That is, the electrode assembly (20) itself can act as a rotating blade. During the stirring process, the contact area and time between the electrolyte and the electrode assembly are greatly increased, thereby significantly improving the impregnation rate and degree. Furthermore, in order to improve the impregnation rate and degree of the electrode assembly (20) throughout its entire height, preferably, the electrode assembly (20) performs translational movement. That is, preferably, the electrode assembly (20) moves vertically.

[0077] The stirring and translational movements can be performed alternately or simultaneously. During this process, due to the physical impact applied to the electrolyte and electrode assembly (20), gas in the electrolyte may be expelled in the form of bubbles. In other words, the expulsion of gas from the electrolyte can be promoted.

[0078] Preferably, this active movement of the electrode assembly can be performed when an external force is transmitted to the electrode assembly (20) through the adapter (60). Specifically, an external drive component that generates rotational and translational transmission is connected to the adapter (60), and the rotational and translational transmission of the adapter (60) can be transmitted to the electrode assembly (20). Here, preferably, a shared clamp (50) acts as an intermediary connecting the adapter (60) and the electrode assembly (20). That is, preferably, a shared clamp is provided between the two parts to mitigate the impact directly applied to the electrode assembly (20), thereby protecting the electrode assembly (20).

[0079] Meanwhile, when the battery casing is cylindrical or rectangular, the electrolyte can be stirred by the electrode assembly while the battery casing is fixed. Stirring can also be performed when the electrode assembly inside the battery casing is not physically connected to the battery casing. By stirring the electrolyte through the electrode assembly, the impregnation process can be performed smoothly.

[0080] Meanwhile, when the battery casing is pouch-type, electrolyte stirring can be performed via the electrode assembly even when the battery casing is not fixed. With the electrode assembly physically connected to the battery casing, movement of the electrode assembly can be transmitted to the electrolyte and the battery casing. As a result, the electrode assembly, electrolyte, and the entire casing can rock up and down and rotate. By repeatedly rotating in both directions, electrolyte stirring can be performed more smoothly.

[0081] The stirring and translational motions result in large momentum or displacement of the electrode assembly (20) and the electrolyte (30). Therefore, impregnation can be carried out quickly in this process, and gases can be expelled. However, air bubbles on the surface of the electrode assembly (20), especially the surface of the diaphragm, or tiny air bubbles in the electrolyte, may still not be expelled.

[0082] Therefore, in this example, preferably, an excitation that results in a relatively small displacement is performed. This excitation can be performed after stirring, or independently of stirring, either alone or on its own.

[0083] like Figure 4 As shown, preferably, the electrode assembly (20) is actively excited inside the battery housing (10). Specifically, the electrode assembly (20) can be configured to be excited at a certain excitation frequency inside the battery housing (10). That is, the electrode assembly (20) itself can act as a vibrator. During the vibration process, the high-frequency vibration of the electrolyte and the electrode assembly promotes the discharge of air bubbles. Of course, the degree of impregnation can also be further increased during the vibration process.

[0084] The excitation frequency can be either ultrasonic or megasonic. Specifically, the excitation frequency can range from 20 kHz to 3000 kHz. Higher frequencies result in smaller amplitudes, thus reducing damage to the electrode assembly. More specifically, megasonic vibrations can be excited at frequencies from 500 kHz to 3000 kHz, while ultrasonic vibrations can be excited at frequencies from 20 kHz to 100 kHz.

[0085] Preferably, this active vibration of the electrode assembly is performed when external vibration is transmitted to the electrode assembly (20) via the adapter (70). Specifically, the external excitation component that generates the vibration is connected to the adapter (70), and the vibration of the adapter (70) is transmitted to the electrode assembly (20), thereby allowing the electrode assembly (20) to vibrate. Here, preferably, the shared clamp (50) acts as an intermediary connecting the adapter (70) and the electrode assembly (20). That is, preferably, a shared clamp is provided between the two parts to mitigate the impact directly applied to the electrode assembly (20), thereby protecting the electrode assembly (20).

[0086] As described above, in the case of a cylindrical or square housing, the excitation operation can be performed with the housing fixed, while in the case of a bag-shaped housing, the excitation operation can be performed without the housing fixed. In either case, smooth degassing can be performed by directly exciting the electrode assembly.

[0087] at the same time, Figure 3 The adapter (60) shown is with Figure 4The adapters (70) shown may be the same adapter, but they can be distinguished because of the different forms or degrees of motion or displacement to be transmitted. That is, preferably, the stirring adapter (60) and the excitation adapter (70) are distinguishable from each other. The stirring adapter (60) can be connected to an external drive component or stirring device to be attached to or detached from the shared clamp (50), and the excitation adapter (70) can be connected to an external excitation component or excitation device to be attached to or detached from the shared clamp (50).

[0088] Once the electrolyte injection, electrode assembly introduction, stirring, and excitation are all completed, the shared clamp (50) can be removed from the electrode assembly (20), as follows: Figure 5 As shown. Afterwards, the entire encapsulation process can be completed by sealing the opening in the battery casing.

[0089] The sealing of the opening can be performed in a vacuum environment, and any remaining gas can be vented during the process.

[0090] The above examples demonstrate how to significantly improve the impregnation rate and degree of the electrolyte, and how to actively and efficiently remove air bubbles during the encapsulation process. Therefore, it is evident that minimizing the generation of air bubbles or gas in the final battery can improve battery performance and extend battery life. Furthermore, it is understood that minimizing gas generation can also significantly improve stability.

[0091] Of course, by utilizing the electrode assembly (20) for active stirring and vibration, it is expected that the impregnation rate will increase, the degree of impregnation will increase, and the gas discharge will be promoted and enhanced. Furthermore, compared with conventional packaging, it is also expected that the manufacturing time will be significantly shortened.

[0092] Meanwhile, in this example, the removal of foam or bubbles can be further facilitated by a mesh filter (40).

[0093] like Figure 1 and Figure 2 As shown, electrolyte (30) and mesh filter (40) can be introduced into the interior of battery housing (10). Mesh filter (40) can be introduced first, followed by electrolyte (30). Alternatively, mesh filter (40) can be introduced into the interior of battery housing (10) before manufacturing, and then only electrolyte can be introduced into the interior of battery housing (10) during the electrolyte injection process.

[0094] During the electrolyte injection process (30), the mesh filter (40) can be quickly immersed in the electrolyte due to its mesh structure. In addition, during this process, the mesh filter (40) can also adhere tightly to the inner surface of the battery casing (10).

[0095] Preferably, the mesh filter (40) can be formed of a fibrous material, and its shape can be freely deformed. That is, it is preferable to arrange the mesh filter (40) to wrap around the electrode assembly (20) to be introduced later. The mesh filter (40) can be formed as a strip with a certain width. Therefore, the mesh filter (40) can be easily removed from the battery housing (10) by pulling one end of the mesh filter (40). That is, the mesh filter (40) can be easily removed even when the electrode assembly (20) is in the battery housing (10). This can be achieved by the material and shape of the mesh filter (40).

[0096] like Figure 3 and Figure 4 As shown, the stirring and vibration of the electrode assembly (20) are preferably performed with the mesh filter (40) introduced. Here, since the mesh filter (40) is preferably formed of a very soft material, it also serves to protect the outer shell of the electrode assembly (20). That is, the outer shell of the electrode assembly (20), (especially the shell of the diaphragm) can pass through the mesh filter (40) without being slapped, thereby preventing damage to the diaphragm.

[0097] Meanwhile, due to the characteristics of the mesh structure, bubble capture through the mesh filter (40) can be performed smoothly. Therefore, during the removal process of the mesh filter, bubbles or foams that still exist inside the electrolyte by stirring and vibration can be removed together with the mesh filter.

[0098] The following will refer to Figure 6 A manufacturing method according to an example of the present invention will be described in more detail. The manufacturing method may be a packaging step or part of a general secondary battery manufacturing process.

[0099] After the electrode assembly (20) and the battery casing (10) are manufactured separately through separate processes, the process of assembling these two components can be performed. At this time, the battery casing is filled not only with the electrode assembly but also with electrolyte (30).

[0100] In this example, firstly, a filling step (S10) can be performed to fill the battery casing with electrolyte. Then, an insertion step (S20) can be performed to insert the electrode assembly from the outside of the battery casing into the inside of the battery casing. Of course, the insertion step can be performed first, and then the filling step can be performed.

[0101] After the insertion step (S20) is performed, an impregnation step (S30) in which the electrode assembly is impregnated with electrolyte can be performed. The impregnation step (S30) can be performed by allowing the electrode assembly to move directly.

[0102] Specifically, the impregnation process (S30) can be performed simultaneously with connecting the adapter (60) to the electrode assembly (20) and transmitting the movement of the adapter to the electrode assembly, thereby agitating the electrolyte through the electrode assembly. This agitation improves the impregnation performance of the electrolyte on the electrode assembly.

[0103] Here, preferably, the movement of the adapter includes translational and rotational movements. Specifically, the translational movement can be the up-and-down movement of the electrode assembly. This movement of the adapter is directly transmitted to the movement of the electrode assembly (20), enabling the electrode assembly (20) to directly stir the electrolyte. In this process, impregnation can be performed very effectively and quickly.

[0104] The translational and rotational movements of the electrode assembly can be performed alternately, or they can be performed simultaneously.

[0105] After performing the impregnation process (S30), a degassing process (S40) can be performed. In the degassing process (S40), residual gas in the battery casing can be actively discharged to the outside.

[0106] Specifically, gas can be actively removed by exciting the electrolyte through the electrode assembly. At this time, the electrode assembly itself also vibrates. More specifically, the vibration can be transmitted to the electrode assembly by connecting an adapter to the electrode assembly and exciting the adapter.

[0107] Excitation by the electrode assembly and electrolyte causes bubbles attached to the surface of the electrode assembly and residual bubbles inside the electrolyte to vibrate together, detach, and rise, thus promoting their removal to the outside. In other words, degassing can be performed to ensure that residual gases are removed quickly and effectively.

[0108] Simultaneously, after the degassing process (S50) is completed, the process of sealing the battery casing can be performed. At this time, vacuum treatment can be carried out. That is, a vacuum environment can be provided for the battery casing and electrode assembly. Of course, the electrolyte may also be exposed to the vacuum environment. In the vacuum environment, due to the pressure difference, residual gas inside the electrolyte can be separated from and discharged from the electrolyte. This vacuum process can be referred to as a process of performing the sealing process itself in a vacuum environment, rather than a process of separately discharging residual gas.

[0109] By actively agitating the electrode assembly and electrolyte during the impregnation process, an environment can be created that significantly increases the impregnation rate and extent while simultaneously enabling rapid gas removal. Subsequently, by actively vibrating the electrode assembly and electrolyte during the degassing process, gas removal can be achieved very quickly and effectively.

[0110] Meanwhile, because a mesh filter is installed inside the battery casing during the impregnation and degassing processes, it can be more efficient in protecting the electrode components and removing foam and gas.

[0111] Furthermore, in the impregnation and degassing processes, the devices for motion and excitation can be more easily manufactured by directly agitating and vibrating the electrolyte through movement and excitation of the electrode assembly itself rather than the battery casing. In particular, damage to the electrode assembly can be prevented by using shared fixtures to attenuate the impact of external forces applied to the electrode assembly.

[0112] In the above example, the excitation of the electrode assembly itself, rather than the housing containing the electrode assembly, and the vibration of the electrode assembly itself, can be performed sequentially, simultaneously, or repeatedly. Of course, only one of these operations can be performed. In this way, the impregnation performance can be ensured in advance, the efficiency of subsequent charge-discharge, aging, and degassing processes can be improved, and the defect rate can be significantly reduced.

[0113] Industrial applicability

[0114] This is described in the detailed description of the invention.

Claims

1. A method for manufacturing a secondary battery, the method comprising the following steps: A filling process, wherein the electrolyte is filled into the battery casing; An insertion process, wherein the electrode assembly is inserted into the interior of the battery casing; as well as The degassing process connects an adapter to the electrode assembly, transmits excitation from the adapter to the electrode assembly, and excites the electrolyte through the electrode assembly to remove gas.

2. The secondary battery manufacturing method according to claim 1, wherein the secondary battery manufacturing method comprises the following steps: The vacuum process, following the degassing process, provides a vacuum environment for the battery casing and the electrode assembly to remove residual gases.

3. The method for manufacturing a secondary battery according to claim 1, characterized in that: The excitation applied to the adapter is performed at an ultrasonic excitation frequency or a megason excitation frequency.

4. The method for manufacturing a secondary battery according to claim 1, characterized in that: The battery casing is positioned so that the opening of the battery casing faces upward, and then the filling process and the degassing process are performed.

5. The method for manufacturing a secondary battery according to claim 4, characterized in that: With the shared clamp mounted on the electrode assembly, the electrode assembly is inserted into and positioned within the battery housing.

6. The method for manufacturing a secondary battery according to claim 5, characterized in that: The shared clamp is positioned at the bottom of the opening, or the shared clamp is positioned by protruding to the top of the opening.

7. The method for manufacturing a secondary battery according to claim 6, characterized in that: The electrode assembly and the adapter are connected via the shared clamp.

8. The method for manufacturing a secondary battery according to claim 1, characterized in that: The degassing process is performed with the mesh filter surrounding the electrode assembly inside the battery housing.

9. The method for manufacturing a secondary battery according to claim 8, characterized in that: After the degassing process, the mesh filter is removed from the battery housing.

10. The method for manufacturing a secondary battery according to claim 8, characterized in that: The mesh filter is inserted into the battery housing together with the electrode assembly; or the electrode assembly is inserted into the battery housing after the mesh filter is inserted into the battery housing.

11. The method for manufacturing a secondary battery according to any one of claims 1 to 10, characterized in that: The insertion process is performed after the filling process, or the filling process is performed after the insertion process.

12. The method for manufacturing a secondary battery according to claim 11, characterized in that, The secondary battery manufacturing method further includes the following steps: The impregnation process connects the adapter to the electrode assembly, transmits the movement of the adapter to the electrode assembly, and stirs the electrolyte through the electrode assembly to improve the impregnation performance of the electrolyte on the electrode assembly.

13. The method for manufacturing a secondary battery according to claim 12, characterized in that: After the impregnation process is performed, the degassing process is performed.

14. The method for manufacturing a secondary battery according to claim 12, characterized in that: The movement of the adapter includes translational and rotational movements.

15. The method for manufacturing a secondary battery according to claim 12, characterized in that: The adapter includes: A stirring adapter, the stirring adapter being used to stir the electrode assembly; and An excitation adapter, which is separate from the stirring adapter, is used to excite the electrode assembly.

16. A method for manufacturing a secondary battery, characterized in that, The secondary battery manufacturing method includes the following steps: A filling process, wherein the electrolyte is filled into the battery casing; An insertion process, wherein the insertion process inserts the electrode assembly into the interior of the battery casing; and The impregnation process connects the adapter to the electrode assembly, transmits the motion of the adapter to the electrode assembly, and stirs the electrolyte through the electrode assembly to improve the impregnation performance of the electrolyte on the electrode assembly.

17. The method for manufacturing a secondary battery according to claim 16, characterized in that: The insertion process is performed after the filling process, or the filling process is performed after the insertion process.

18. The method for manufacturing a secondary battery according to claim 17, characterized in that, The secondary battery manufacturing method further includes the following steps: A degassing process, wherein the degassing process connects an adapter to the electrode assembly, transmits excitation from the adapter to the electrode assembly, and excites the electrolyte through the electrode assembly to remove gas; and A vacuum process is provided to create a vacuum environment for the battery casing and the electrode assembly to remove residual gases.

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