Battery manufacturing method and battery

Abstract

The invention relates to a battery manufacturing method and a battery. The battery manufacturing method comprises the following steps: S20, placing a battery cell in a battery shell; s30, electrolyte is injected into the shell, and the shell is sealed; s40, allowing the battery to stand; s50, carrying out formation on the battery; the manufacturing method of the battery comprises one or more steps of adsorbing or filling oxygen molecules into the battery, and further comprises a step S10 of adsorbing oxygen by a pole piece of a battery cell before the step S20, in the step S30, oxygen is used as pressurized gas for electrolyte filling; in the step S40, the shell of the battery is filled with oxygen. According to the invention, the battery adsorbs or is filled with oxygen molecules in the battery manufacturing process, so that the proportion of inorganic matters in the SE I film is increased in the formation process, the compact and stable SE I film is further formed, the side reaction of the battery cell is not easy to occur in the storage process, and the calendar life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, and more specifically to a battery manufacturing method and a battery. Background Technology

[0002] During the initial charge and discharge of a liquid lithium-ion battery, the electrode material and the electrolyte react at the solid-liquid interface, forming a passivation layer covering the surface of the electrode material. This passivation layer is an interface layer with the characteristics of a solid electrolyte. It is an electronic insulator but an excellent conductor of Li+. Li+ can freely insert and extract through this passivation layer. Therefore, this passivation film is called a "solid electrolyte interface" (SEI film) or simply a "solid electrolyte interface".

[0003] An SE I film can be formed at the interface between the graphite anode material and the electrolyte through interfacial reactions. Multiple analytical methods have confirmed the existence of the SE I film, with a thickness of approximately 100–120 nm. Its composition mainly consists of various inorganic components such as Li₂CO₃, LiF, Li₂O, and LiOH, and various organic components such as ROCO₂Li, ROLi, and (ROCO₂Li)₂. During battery formation, a two-electron reaction first occurs at the electrode-electron interface to form inorganic lithium salts. As the reaction proceeds, the inorganic lithium salt layer gradually thickens, making it more difficult for electrons to reach the reaction interface, thus leading to a single-electron reaction at the interface to form organic lithium salts. Inorganic lithium salts have advantages over organic lithium salts, such as denser structure, better chemical stability, and lower impedance. Therefore, in practical formation processes, it is preferable to form an SE I film with a higher proportion of inorganic lithium salt components. Summary of the Invention

[0004] This invention provides a battery manufacturing method and a battery that effectively promotes the formation of inorganic matter in the SE I film during the formation process, thereby forming a denser and more stable SE I film. This makes the battery cell less prone to side reactions during storage, thus improving its calendar life.

[0005] This application provides a battery manufacturing method, including the following steps: S20, placing a battery cell inside a battery casing; S30, adding electrolyte into the casing and sealing it; S40, allowing the battery to stand.

[0006] S50, the battery is formed; wherein the battery manufacturing method includes one or more steps of adsorbing or filling the battery with oxygen molecules: before step S20, the method further includes step S10 of adsorbing oxygen on the electrode of the cell; in step S30, the electrolyte is added using oxygen as a pressurized gas; in step S40, oxygen is filled into the casing of the battery.

[0007] In this way, by allowing the battery to adsorb or fill oxygen molecules during the battery manufacturing process, the proportion of inorganic matter in the SEI film is increased during the formation process, thereby forming a denser and more stable SEI film. This makes the battery less prone to side reactions during storage, thus improving the battery's calendar life.

[0008] Furthermore, step S10 includes: S11, placing the battery cell in a sealed chamber; S12, evacuating the sealed chamber to a first vacuum level and maintaining it for a first duration; S13, filling the sealed chamber with oxygen to reach a first pressure and maintaining it for a second duration.

[0009] Furthermore, in step S12, the first vacuum degree is -15 kPa to -5 kPa; and / or, in step S12, the first duration is 10 s to 30 s; and / or, in step S13, the first pressure is 40 kPa to 60 kPa; and / or, in step S13, the second duration is 30 min to 40 min.

[0010] Furthermore, in step S30, the electrolyte is injected into the housing through multiple cycles of vacuuming and pressurization; wherein the multiple cycles of vacuuming and pressurization satisfy the following conditions: the housing is evacuated to a second vacuum level and maintained for a third duration; oxygen is introduced into the housing to a second pressure and maintained for a fourth duration.

[0011] Furthermore, the second vacuum degree is ≤-10 kPa; and / or, the third duration is 10 s to 30 s; and / or, the second pressure is 600 kPa to 900 kPa; and / or, the fourth duration is 200 s to 300 s; and the number of cycles is 2 to 5.

[0012] Furthermore, step S40 includes: S41, placing the battery at a first temperature for a fifth duration; S42, filling the casing with a preset volume of oxygen; S43, placing the battery at a second temperature for a sixth duration, wherein the second temperature is higher than the first temperature.

[0013] Further, in step S41, the first temperature is 25°C; and / or, in step S41, the fifth duration is 24h to 48h; and / or, in step S42, the battery is placed in an oxygen atmosphere, and oxygen is introduced into the casing at 25°C using a pressure of 0.6MPa, the preset volume being 10% to 50% of the casing volume; and / or, in step S43, the second temperature is 45°C; and / or, in step S43, the sixth duration is 12h to 24h.

[0014] Furthermore, in step S50, the battery is formed at a third temperature, the third temperature being 45°C to 60°C; and / or, in step S50, the battery is formed using a DC stepped charging method, the DC stepped charging current range being 0.01C-0.3C.

[0015] This application also provides a battery, which is manufactured using the battery manufacturing method described in any of the above technical solutions.

[0016] Furthermore, the battery is a cylindrical battery, a prismatic battery, a blade battery, or a pouch battery. Attached Figure Description

[0017] Figure 1 This is a flowchart of the battery manufacturing method described in this application.

[0018] Figure 2 This is a flowchart illustrating the steps of absorbing oxygen onto the electrodes of a battery cell according to one embodiment of this application.

[0019] Figure 3 This is a flowchart of battery electrolyte filling according to one embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the structure of an injection device according to an embodiment of this application.

[0021] Figure 5 This is a flowchart of a battery resting process according to an embodiment of this application.

[0022] Figure 6 This is a comparison diagram of the experimental group and the control group in a specific embodiment of this application.

[0023] Figure 7 This is a comparison chart of the EIS curves of the experimental group and the control group in a specific embodiment of this application.

[0024] Figure 8 This is a comparison chart of the high-temperature storage performance of the experimental group and the control group in a specific embodiment of this application.

[0025] Figure 9 This is a comparison diagram of the experimental group and the control group in another specific embodiment of this application. Detailed Implementation

[0026] Numerous specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, inside, outside, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] In the description of this invention, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some implementations," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this invention.

[0030] See Figures 1 to 5 A battery manufacturing method is provided, comprising the following steps: S20, placing a battery cell inside a battery casing; S30, adding electrolyte inside the casing and sealing it; S40, allowing the battery to stand; S50, performing formation on the battery.

[0031] Specifically, in step S20, the battery cell can be fabricated using a lamination or winding process, and then placed inside the battery casing. It is understood that this process includes electrical connections such as welding the battery cell to the battery casing and other structures. The battery can be a cylindrical battery, a prismatic battery, a blade battery, or a pouch battery; no specific limitation is made here.

[0032] The battery casing has an electrolyte filling port, so in step S30, electrolyte is added through the filling port. After filling, the battery is sealed. For example, for a prismatic battery, a sealing plug can be installed on the filling port.

[0033] In step S40, the battery is left to stand after the electrolyte injection is completed. The purpose is to allow the electrolyte to fully wet the positive and negative electrode materials in preparation for subsequent formation.

[0034] In step S50, battery formation is performed, which can be exemplarily achieved using high-temperature formation and DC stepped charging. In some embodiments, the formation temperature is set to 45°C-60°C, and the DC stepped charging current range is 0.01C-0.3C. First, a first current is used for charging for 1-2 hours; then a second current is used for charging for 1-2 hours; finally, a third current is used until the voltage reaches the cutoff voltage, wherein the third current > the second current > the first current, thereby shortening the formation time and improving the performance of the formed cell.

[0035] As described in the background section of this application, by increasing the proportion of inorganic matter in the SEI film, a denser and more stable SEI film can be formed, making the battery cell less prone to side reactions during storage, thus improving the battery's calendar life. Therefore, the battery manufacturing method of this application includes one or more steps of filling or adsorbing oxygen molecules into the battery: before step S20, it further includes a step S10 of adsorbing oxygen onto the electrodes of the battery cell; in step S30, oxygen is used as a pressurized gas for electrolyte injection to dissolve oxygen in the electrolyte; in step S40, oxygen is filled into the battery casing.

[0036] Specifically, see Figure 2 In one specific embodiment, the battery cell is placed in a high-pressure chamber filled with oxygen before liquid injection, so that the pores between particles inside the electrode and the pores of the particles themselves are filled with oxygen, and oxygen molecules are physically adsorbed by interacting with the material surface through van der Waals forces.

[0037] In other words, step S10 specifically includes:

[0038] S11, placing the battery cells in a sealed chamber.

[0039] S12, the sealed chamber is evacuated to a first vacuum level and maintained for a first duration. Exemplarily, the first vacuum level is -15 kPa to -5 kPa, and the first duration is 10 s to 30 s. Further, optionally, the first vacuum level is -10 kPa, and the first duration is 20 s. By pre-evacuating the sealed chamber, the mixing of other gases can be prevented, improving the purity of subsequently introduced oxygen and thus enhancing the oxygen adsorption effect.

[0040] S13, oxygen is introduced into the sealed chamber to reach a first pressure and maintained for a second duration. For example, the first pressure is 40 kPa to 60 kPa, and the second duration is 30 min to 40 min. Further, optionally, the first pressure is 50 kPa, and the second duration is 35 min. In this step, by introducing oxygen at a certain pressure and maintaining the pressure for a relatively long time, oxygen molecules can be physically adsorbed through van der Waals forces interacting with the material surface. This allows oxygen molecules to fill the pores between particles and within the particles themselves inside the electrode, maximizing the adsorption of oxygen molecules.

[0041] Therefore, through step S10 prior to step S20, oxygen molecules can be provided at the electrode-electrolyte interface during the formation and charging process, thereby promoting the formation of inorganic lithium salts on the surface of the negative electrode material and thus improving the battery's calendar life.

[0042] See Figure 3 In another specific embodiment, in step S30, electrolyte is added into the battery casing, for example, by isobaric injection, which requires multiple cycles of vacuuming and pressurization to inject the electrolyte into the battery. In conventional methods, nitrogen is typically used as the pressurizing gas. However, in this embodiment, oxygen is used instead of nitrogen as the pressurizing gas. This allows oxygen to dissolve in the electrolyte during the multiple cycles of vacuuming and pressurization, promoting the formation of inorganic lithium salts on the surface of the negative electrode material during subsequent formation processes.

[0043] For a clearer illustration of the injection process, see [link / reference]. Figure 4 The diagram shows a schematic of the electrolyte injection device in this embodiment. The battery's injection port 1 is connected to the injection cup 2, which is connected to an external storage tank (not shown) via a top opening 3 and through pipes, valves, and other structures. The battery and injection cup are placed in a sealed container 4, which has a vacuum port 5. This port allows for either evacuation to create a negative pressure or inflation to create a positive pressure. During the process of adding electrolyte to the battery, the cavity of the sealed container 4, the inside of the battery casing, and the injection cup 2 are all interconnected, ensuring isobaric electrolyte injection.

[0044] The specific injection process is as follows:

[0045] S31. After connecting the filling cup to the battery filling port, place it in a sealed container; evacuate the container to ≤-90kPa and maintain this state for 10s-30s. The purpose is to remove the original gas in the sealed container in preparation for subsequent oxygen filling.

[0046] S32, depressurize and fill the container with oxygen to ≤5kPa, so that subsequent liquid injection is carried out in an oxygen atmosphere.

[0047] S33, a metered amount of electrolyte is injected into the injection cup via an injection machine. Due to the pressure balance inside and outside the battery, the electrolyte will flow into the battery under its own gravity.

[0048] S34, Evacuate the container, i.e., evacuate the battery, to a second vacuum level and maintain it for a third duration. For example, the second vacuum level is ≤-10kPa, and the third duration is 10s to 30s.

[0049] S35, oxygen is introduced into the container, that is, oxygen is introduced into the battery, to a second pressure, and maintained for a fourth duration. For example, the second pressure is 600 kPa to 900 kPa, and the fourth duration is 200 s to 300 s.

[0050] S36, repeat steps S34 to S352-5 times to complete the electrolyte filling.

[0051] During this process, due to the continuous application of positive pressure and the extraction of vacuum, the gas in the pores inside the electrode can be continuously compressed and extracted, so that the electrolyte will flow from the injection cup into the battery under the action of gravity, thereby continuously wetting the cell.

[0052] S37, depressurize to atmospheric pressure, insert rubber plug into battery filling port and proceed to the wetting process.

[0053] It should be noted that the electrolyte injection process requires multiple vacuuming and pressurization cycles to inject the electrolyte into the cell. Verification has shown that the injection process is more significantly affected by the pressurization process, while the vacuum degree and holding time during the vacuuming process have little impact on the amount and efficiency of electrolyte injection. Therefore, in order to minimize the impact on electrolyte injection and reduce the influence of vacuuming during the injection process on the oxygen adsorbed in the electrode and electrolyte in the early stage, in this embodiment, the vacuum degree and holding time are reduced based on the traditional vacuuming parameters, while a longer positive pressure holding time is set.

[0054] Thus, during the electrolyte injection process, by using oxygen as the pressurized gas, the dissolved oxygen in the electrolyte is saturated through oxygen respiration. This process allows oxygen molecules to be provided at the electrode-electrolyte interface during formation and charging, thereby promoting the formation of inorganic lithium salts on the surface of the negative electrode material and ultimately improving the battery's calendar life.

[0055] See Figure 5 In yet another specific embodiment, step S40, which involves allowing the battery to stand before formation to introduce oxygen molecules, specifically includes:

[0056] S41, the battery is left to stand at a first temperature for a fifth duration. For example, the first temperature is room temperature, such as 25°C, and the fifth duration is 24 to 48 hours, such as 36 hours.

[0057] S42, fill the battery casing with a predetermined volume of oxygen. Specifically, place the battery in an oxygen atmosphere, such as in an oxygen chamber, and fill the battery casing with oxygen at 25°C using a pressure of 0.6 MPa. The volume of oxygen filled is 10% to 50% of the battery casing volume, for example, 10%, 20%, 30%, 40%, 50%, etc. It is understood that after filling the battery casing with oxygen, the battery casing still needs to be sealed.

[0058] S43, the battery is left to stand at a second temperature for a sixth duration, wherein the second temperature is higher than the first temperature, i.e., a high-temperature standing step. For example, the second temperature is 45°C, and the sixth duration is 12 to 24 hours, thereby utilizing the high temperature to ensure thorough mixing of oxygen and electrolyte.

[0059] Furthermore, in this embodiment, step S50 of forming the battery includes forming the battery at a third temperature, for example, the third temperature is 45°C to 60°C.

[0060] Thus, in this embodiment, by injecting a certain amount of oxygen into the battery casing after immersion at room temperature and before formation, the oxygen is used to help increase the content of inorganic oxide components such as Li2CO3, Li2O, and LiOH in the SE I film during the high-temperature formation process.

[0061] Compared to traditional formation processes, conventional low-current pre-charging at room temperature helps form a stable SEI film. However, the composition of the resulting SEI film varies depending on the electrolyte composition, primarily consisting of organic components such as ROCO2Li and ROLi, while the inorganic component content is relatively low. Furthermore, prolonged low-current charging at room temperature leads to an increase in the organic component of the SEI film, increasing its impedance and narrowing the battery's operating temperature range. This negatively impacts the rate performance of the lithium-ion battery, significantly affecting its long-term use and storage life, thus reducing its calendar life. In this embodiment, by introducing oxygen, the generated inorganic oxide produces a more porous negative electrode SEI film, resulting in faster lithium-ion conduction through the SEI film, reducing battery impedance, and significantly increasing the battery's operating and storage temperature range, thereby greatly improving its calendar life.

[0062] To further compare the battery performance obtained by the battery manufacturing method of this application with that obtained by conventional battery manufacturing methods, two specific embodiments are provided below.

[0063] Example 1

[0064] This embodiment is used to manufacture a blade battery, including the following steps:

[0065] Step (1): The battery cell is fabricated by stacking. The fabricated battery cell is placed in a sealed chamber. At room temperature of 25°C, the sealed chamber is evacuated to -10 kPa and held for 30 seconds. Then, oxygen is injected into the sealed chamber through a booster pump to reach 50 kPa and held for 35 minutes.

[0066] Step (2): After step (1), the electrode of the cell has adsorbed a certain amount of oxygen. The cell is then placed into the casing of the blade battery.

[0067] Step (3): Perform isobaric liquid injection; connect the liquid injection cup to the battery liquid injection port and place it in a sealed container, evacuate the container to -90kPa and keep it for 20s.

[0068] Step (4): Depressurize and fill the container with oxygen up to 3 kPa.

[0069] Step (5): The electrolyte is injected into the injection cup by the injection machine. The electrolyte will flow into the battery under its own gravity.

[0070] Step (6): Evacuate the container to -10 kPa and hold for 20 seconds.

[0071] Step (7): Fill the container with oxygen to 800 kPa and maintain for 250 seconds.

[0072] Step (8) is repeated three times, from step (6) to step (7).

[0073] Step (9): Depressurize to atmospheric pressure, insert a rubber stopper into the injection port and proceed to the wetting process.

[0074] Step (10), wetting process: wetting time 48h, wetting temperature 45℃, after wetting is completed, transfer to the formation process.

[0075] Step (11) involves forming the battery. Specifically, the battery is placed on a formation cabinet, the formation temperature is set to 45°C, and a DC stepped charging process is adopted. First, the battery is charged at 0.02C for 1 hour; then it is charged at 0.1C for 1.5 hours; and then charged at 0.3C until the cutoff voltage is reached, thus completing the formation of the battery.

[0076] Figures 6 to 8 The performance comparison of the battery cell manufactured by the manufacturing process of this embodiment (i.e., the experimental group) and the conventional process (i.e., the control group) is shown. The conventional process refers to the absence of oxygen introduction, in other words, the absence of step (1) in this embodiment, and the use of conventional nitrogen pressurization for liquid injection.

[0077] Analysis revealed that the experimental group's cells exhibited higher capacity retention compared to the control group's cells after 500 cycles. Simultaneously, the EIS curves showed that the experimental group's cells had lower impedance than the control group's cells, demonstrating that sufficient oxygen molecules at the electrode-electrolyte interface of this embodiment promoted the formation of inorganic lithium salts on the surface of the negative electrode material. The resulting SEI film possesses advantages such as dense structure, good chemical stability, and low impedance. Furthermore, data from cell storage at 45°C showed that the experimental group's cells effectively improved cell calendar life; after 60 days of high-temperature storage, the capacity retention rate of the experimental group's cells remained at 98%.

[0078] Example 2

[0079] In this embodiment, the manufacturing of a cylindrical battery includes the following steps:

[0080] Step (1): Place the wound cell into the casing of the cylindrical battery.

[0081] Step (2) involves injecting electrolyte into the cylindrical battery and then sealing it. In this embodiment, the electrolyte injection method is a conventional method, which uses conventional nitrogen pressurization for injection. This is a conventional technique in the field and will not be described in detail here.

[0082] Step (3): After the electrolyte injection is completed, the battery is left at room temperature, for example, 25°C, for 36 hours to allow the electrolyte to fully wet the positive and negative electrode materials.

[0083] Step (4): After the battery is immersed at room temperature, place it in an oxygen chamber. At 25°C, use an air pump to inject oxygen into the battery casing at a pressure of 0.6 MPa. The volume of the injected oxygen is 20% of the casing volume. Then reseal it.

[0084] Step (5) involves high-temperature immersion, where the battery is placed at a high temperature of 45°C for 24 hours to allow oxygen and electrolyte to mix thoroughly using the high temperature.

[0085] Step (6) involves forming the battery. Specifically, the battery is placed on a formation cabinet, the formation temperature is set to 45°C, and a DC stepped charging process is adopted. First, the battery is charged at 0.02C for 1 hour; then it is charged at 0.1C for 1.5 hours; and then charged at 0.3C until the cutoff voltage is reached, thus completing the formation of the battery.

[0086] A battery was tested using a conventional process (i.e., impregnation and formation without oxygen) versus a battery using the oxygen-injected, high-temperature formation method described in this embodiment. The results are as follows: Figure 9 As shown, the battery manufactured in this embodiment (i.e., the experimental group) has a longer cycle life and calendar life, and better electrochemical performance compared to the battery manufactured by the traditional formation process (i.e., the control group).

[0087] Finally, it is understood that the three methods of adsorbing or filling oxygen molecules in the battery in this application can be combined in different ways to form different embodiments. All of them can provide oxygen molecules at the electrode-electrolyte interface, thereby promoting the formation of inorganic lithium salts on the surface of the negative electrode material. By increasing the proportion of inorganic matter in the SEI film, a denser and more stable SEI film can be formed, making the battery less prone to side reactions during storage, thus improving the battery's calendar life.

[0088] It should be noted that although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A battery manufacturing method, characterized in that, Includes the following steps: S20, placing the battery cells inside the battery casing; S30, add electrolyte into the housing and seal it; S40, allow the battery to stand still; S50, the battery is formed; The battery manufacturing method includes one or more steps of adsorbing or filling the battery with oxygen molecules: Before step S20, the method further includes step S10, which involves adsorbing oxygen onto the electrodes of the battery cell. In step S30, oxygen is used as the pressurized gas for electrolyte injection; In step S40, oxygen is introduced into the casing of the battery.

2. The battery manufacturing method according to claim 1, characterized in that, Step S10 includes: S11, placing the battery cells in a sealed compartment; S12, Evacuate the sealed chamber to a first vacuum level and maintain it for a first duration; S13, oxygen is introduced into the sealed chamber to reach a first pressure and maintained for a second duration.

3. The battery manufacturing method according to claim 2, characterized in that, In step S12, the first vacuum level is -15 kPa to -5 kPa; And / or, in step S12, the first duration is 10s to 30s; And / or, in step S13, the first pressure is 40 kPa to 60 kPa; And / or, in step S13, the second duration is 30 min to 40 min.

4. The battery manufacturing method according to claim 1, characterized in that, In step S30, the electrolyte is injected into the shell through multiple cycles of vacuuming and pressurization. The cycle of multiple vacuuming and pressurizations satisfies the following conditions: The housing is evacuated to a second vacuum level and maintained for a third duration; Oxygen is introduced into the housing to a second pressure and maintained for a fourth duration.

5. The battery manufacturing method according to claim 4, characterized in that, The second vacuum degree is ≤-10kPa; And / or, the third duration is 10s to 30s; And / or, the second pressure is 600 kPa to 900 kPa; And / or, the fourth duration is 200s to 300s; And the number of cycles is 2 to 5.

6. The battery manufacturing method according to claim 1, characterized in that, Step S40 includes: S41, the battery is left to stand at the first temperature for a fifth time; S42, fill the shell with a preset volume of oxygen; S43, the battery is left to stand at a second temperature for a sixth time, wherein the second temperature is higher than the first temperature.

7. The battery manufacturing method according to claim 6, characterized in that, In step S41, the first temperature is 25°C; And / or, in step S41, the fifth duration is 24h to 48h; And / or, in step S42, the battery is placed in an oxygen atmosphere, and oxygen is introduced into the housing at 25°C using a pressure of 0.6 MPa, wherein the preset volume is 10% to 50% of the housing volume; And / or, in step S43, the second temperature is 45°C; And / or, in step S43, the sixth duration is 12h to 24h.

8. The battery manufacturing method according to any one of claims 1-7, characterized in that, In step S50, the battery is formed at a third temperature, which is 45°C to 60°C. And / or, in step S50, the battery is formed using a DC stepped charging method, wherein the current range of the DC stepped charging is 0.01C-0.3C.

9. A battery, characterized in that, The battery is manufactured using the battery manufacturing method as described in any one of claims 1-8.

10. The battery according to claim 9, characterized in that, The battery is a cylindrical battery, a prismatic battery, a blade battery, or a pouch battery.

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