A method for preparing an electronically controlled rechargeable battery

Abstract

The present invention discloses a method for preparing an electrically controlled rechargeable battery, comprising the following steps: S1, loading a winding core into a housing; S2, welding the negative pole ear of the winding core to the bottom of the housing; S3, welding the positive pole ear of the winding core to the control circuit assembly of the control end cover; S4, closing the control end cover on the housing, and sealing and welding the connection between the control end cover and the housing to form a liquid injection space; S5, injecting liquid into the liquid injection space from the liquid injection hole; S6, blocking the liquid injection hole. The present invention provides a liquid injection hole connected to the liquid injection space on the control end cover. During production, the winding core is directly installed in the housing, and liquid is directly injected through the liquid injection hole after being packaged with the control end cover. There is no need to inject liquid into the winding core and then install it in the housing, thereby effectively reducing the battery production steps and greatly improving the battery production efficiency. At the same time, since the winding core is directly installed in the housing, the original battery shell is eliminated, and the volume of the battery is effectively reduced, which is convenient for the use of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a method for preparing an electrically controlled rechargeable battery. Background Art

[0002] Rechargeable batteries are a new type of battery that combines lithium-ion batteries with lithium battery charging control technology. Because they usually have a long service life and can undergo multiple charge and discharge cycles, they are more economical and environmentally friendly than disposable dry batteries. Their energy density, discharge rate and other performance are higher than those of disposable dry batteries. Therefore, they are widely used in various electronic devices and mobile devices.

[0003] Rechargeable batteries are usually composed of lithium batteries and control end covers. A control circuit board is arranged in the control end cover. During installation, the positive end of the lithium battery is usually connected to the control circuit, and then the positive terminal is led out to the outside of the control end cover by the control circuit. Finally, the end cover is pressed to the outside of the positive end of the lithium battery by mechanical pressing. Among them, the lithium battery is composed of a battery cell and a steel shell, and the battery cell is composed of a battery cell shell and a winding core. During production, the winding core is usually placed in the battery cell shell, and then the battery cell is injected with liquid and packaged to form a battery cell. Then, the battery cell is placed in the steel shell and the control end cover is connected to the steel shell to complete the assembly of the battery. This method has very complicated steps during production and the battery volume is relatively large. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for preparing an electrically controlled rechargeable battery, comprising the following steps:

[0005] S1, loading the roll core into the shell;

[0006] S2, welding the negative electrode tab of the winding core to the bottom of the shell;

[0007] S3, welding the positive electrode tab of the winding core to the control circuit assembly of the control end cover;

[0008] S4, the control end cover is covered on the housing, and the connection between the control end cover and the housing is sealed and welded; the control end cover and the housing cooperate to form a liquid injection space;

[0009] S5, injecting liquid into the injection space from the injection hole; the injection hole is provided in the control end cover and communicates with the injection space;

[0010] S6, sealing the injection hole.

[0011] According to one embodiment of the present invention, S6 includes the following sub-steps:

[0012] S61, preset plugging parts;

[0013] S62, press-seal the sealing member into the injection hole.

[0014] According to one embodiment of the present invention, in S5, the process also includes:

[0015] S5', baking the core to remove water.

[0016] According to one embodiment of the present invention, the blocking member is interference fit with the liquid injection hole.

[0017] According to one embodiment of the present invention, in S2, the negative electrode tab of the winding core is welded to the bottom of the shell by laser welding.

[0018] According to one embodiment of the present invention, in S3, laser welding is used to weld the positive electrode tab of the winding core to the control circuit assembly of the control end cover.

[0019] According to an embodiment of the present invention, in S4, laser welding is used to weld the connection between the control end cover and the housing.

[0020] According to one embodiment of the present invention, the outer diameter of the outer shell at one end close to the positive electrode tab is greater than the outer diameter of the outer shell at one end close to the negative electrode tab.

[0021] According to one embodiment of the present invention, the control end cover has a charging interface, which is electrically connected to the control circuit component of the control end cover, and one end of the charging interface is exposed outside the control end cover.

[0022] According to one embodiment of the present invention, before S1, it also includes: S0, presetting a winding core, and the upper and lower ends of the winding core respectively have a positive electrode tab and a negative electrode tab.

[0023] The beneficial effect of the present invention is that by arranging a liquid injection hole connected to the liquid injection space on the control end cover, the core can be directly installed in the outer shell during production, and liquid can be directly injected through the liquid injection hole after being packaged with the control end cover. There is no need to inject liquid into the core and then install it in the outer shell, thereby effectively reducing the battery production steps and greatly improving the battery production efficiency. At the same time, since the core is directly installed in the outer shell, the original battery shell is eliminated, the volume of the battery is effectively reduced, and the battery is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 This is one of the structural schematic diagrams of the electronically controlled rechargeable battery in Example 1;

[0026] Figure 2 This is a schematic diagram of the control end cover structure in Example 1;

[0027] Figure 3 This is a schematic diagram of the structure of the control end cover and the blocking member in the first embodiment;

[0028] Figure 4 The second structural diagram of the electronically controlled rechargeable battery in the first embodiment;

[0029] Figure 5 Flow chart of the method for preparing the electronically controlled rechargeable battery in Example 2. DETAILED DESCRIPTION

[0030] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0031] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Embodiment 1:

[0033] See also Figure 1-Figure 3 , Figure 1 This is one of the structural schematic diagrams of the electronically controlled rechargeable battery in Example 1. Figure 2 This is a schematic diagram of the control end cover structure in Example 1. Figure 3The structure diagram of the control end cover and the plugging member in the first embodiment. An electrically controlled rechargeable battery in this embodiment includes a battery body 1 and a control end cover 2, wherein the battery body 1 includes a shell 11 and a winding core 12, one end of the shell 11 has an opening 1111, the winding core 12 is arranged in the shell 11, and the two ends of the winding core 12 have pole ears, one end of which is connected to the bottom of the shell 11, and the control end cover 2 includes an end cover shell 21, a control circuit assembly 22 and a positive terminal 23, the control circuit assembly 22 is arranged in the end cover shell 21, one end of the positive terminal 23 is electrically connected to the control circuit assembly 22, and the other end thereof passes through the end cover shell 21. Exposed outside the end cover shell 21, the end cover shell 21 covers the opening 1111 of the outer shell 11, the pole ear at the other end of the winding core 12 is connected to the control circuit component 22, the positive terminal 23 and the bottom end of the outer shell 11 respectively form the positive and negative poles of the battery. Further, the control end cover 2 also includes at least one sealing member 24, the control end cover 2 is provided with a liquid injection hole 25, the liquid injection hole 25 passes through the outer wall of the control end cover 2 to the control end cover 2, so that the inside of the outer shell 11 is connected with the outside of the control end cover 2, and the sealing member 24 is sealed in the liquid injection hole 25. In this example, the sealing member 24 is provided with one.

[0034] During production, after the core 12 is installed in the shell 11, the control end cover 2 is covered at the opening 1111 of the shell 11. At this time, liquid can be injected into the core 12 in the shell 11 through the injection hole 25. After the injection is completed, the sealing member 24 is installed in the injection hole 25 to seal the injection hole 25, thereby completing the production of the battery without the need to additionally inject and package the core. In this way, not only the production steps of the battery are greatly simplified and the production efficiency is improved, but also the core 12 is directly installed in the battery shell 11, which also eliminates the battery cell shell in the prior art and effectively reduces the volume of the battery.

[0035] In specific implementation, sealing materials can be used to isolate the control circuit component 22 from the winding core 12, and holes can be reserved between the sealing materials to connect with the injection hole 25. It can be understood that a tubular inner wall can be set in the injection hole 25 to further achieve the sealing of the interior of the shell 11 and the battery control component.

[0036] Furthermore, a first through hole 211 is formed at one end of the end cover shell 21 facing away from the battery body 1 , and the other end of the positive terminal 23 is exposed outside the end cover shell 21 through the first through hole 211 .

[0037] The injection hole 25 is disposed adjacent to the first through hole 211 at one end of the end cover housing 21 , and penetrates the end cover housing 21 and the control circuit assembly 22 in sequence.

[0038] Specifically, in this example, the injection hole 25 is a circular hole, the sealing member 24 is a spherical ball, and the outer diameter of the sealing member 24 is larger than the inner diameter of the column liquid hole 25 to improve the sealing stability of the sealing member, wherein the sealing member 24 is a steel ball.

[0039] Preferably, the end cover shell 21 is also provided with a second through hole 212, and the control circuit assembly 22 has a charging interface (not shown in the figure), and the charging interface (not shown in the figure) is exposed in the second through hole 212. In this example, the charging interface (not shown in the figure) can adopt a TYPE-C interface to improve the convenience of battery charging, thereby improving the convenience of product use.

[0040] Furthermore, the control circuit component 22 also has a connecting terminal 221, and the connecting terminal 221 is arranged on the side of the control circuit component 22 facing away from the positive terminal 23, and the pole ear at one end of the core 12 is connected to the connecting terminal 221, so as to realize the connection between the core 12 and the control circuit component 22. When the sealing material is used to seal the control circuit component 22 and the inside of the outer shell 11, the connecting terminal 221 can be exposed toward the core 12, so that the pole ear of the core 12 can be connected to the connecting terminal 221.

[0041] See also Figure 4 , review Figure 1-Figure 3 , Figure 4 The second structural schematic diagram of the electrically controlled rechargeable battery in the first embodiment. Preferably, in this embodiment, the housing 11 includes a diameter-changing section 111 and a housing body 112, the outer diameter D1 of the diameter-changing section 111 is smaller than the outer diameter D2 of the housing body 112, the end cover shell 21 is sleeved outside the diameter-changing section 111, and its outer diameter D3 is greater than the outer diameter of the diameter-changing section 111 and equal to the outer diameter D2 of the housing body 112, and the opening 1111 is opened at one end of the diameter-changing section 111 facing away from the housing body 112. When the end cover shell 21 is sleeved outside the diameter-changing section 111, the flatness of the battery exterior can be effectively maintained, thereby maintaining the overall aesthetics of the battery, and at the same time, preventing the battery surface from bulging and affecting the use of the battery.

[0042] In a specific implementation, the length L of the housing 11 may range from 25 mm to 65 mm, wherein:

[0043] When the outer diameter D2 of the housing body 112 is 10.1 mm, the outer diameter D1 of the diameter-reducing section 111 is 9.7 mm;

[0044] When the outer diameter D2 of the housing body 112 is 12.9 mm, the outer diameter D1 of the diameter-reducing section 111 is 12.5 mm;

[0045] When the outer diameter D2 of the housing body 112 is 13.7 mm, the outer diameter D1 of the diameter-reducing section 111 is 13.3 mm;

[0046] When the outer diameter D2 of the housing body 112 is 14.0 mm, the outer diameter D1 of the diameter-reducing section 111 is 13.6 mm;

[0047] When the outer diameter D2 of the housing body 112 is 16.4 mm, the outer diameter D1 of the diameter-reducing section 111 is 16.0 mm;

[0048] When the outer diameter D2 of the housing main portion 112 is 18.1 mm, the outer diameter D1 of the diameter-reducing section 111 is 17.7 mm.

[0049] Furthermore, in each set of parameters, the error range of the outer diameter D2 of the shell body 112 is ±0.1 mm, and the error range of the outer diameter D1 of the diameter-reducing section 111 is ±0.4 mm.

[0050] In this example, the tabs at both ends of the winding core 12 are laser welded to the bottom of the shell 11 and the connecting terminal 221 respectively, and one end of the end cover shell 21 is also laser welded to one end of the shell body 112 near the reducing section 111.

[0051] In summary, in this example, by setting the injection hole on the control end cover, during production, after the core is installed in the shell, the control end cover is covered at the opening of the shell. At this time, liquid can be injected into the core in the shell through the injection hole. After the injection is completed, the sealing piece is installed in the injection hole to seal the injection hole, thereby completing the production of the battery without the need to additionally inject and package the core. In this way, not only the production steps of the battery are greatly simplified and the production efficiency is improved, but also the core is directly installed in the battery shell, which also eliminates the battery cell shell in the prior art and effectively reduces the volume of the battery.

[0052] Embodiment 2:

[0053] See also Figure 5 , review Figure 1-Figure 4 , Figure 5 Flow chart of the method for preparing an electrically controlled rechargeable battery in Example 2. The above-mentioned electrically controlled rechargeable battery is prepared by the preparation method in this example. In this example, a method for preparing an electrically controlled rechargeable battery includes the following steps:

[0054] S0, presetting the winding core so that the upper and lower ends of the winding core have a positive electrode tab and a negative electrode tab respectively;

[0055] S1, insert the winding core 12 into the housing 11;

[0056] S2, welding the negative electrode tab of the winding core 12 to the bottom of the housing 11;

[0057] S3, welding the positive electrode tab of the winding core 12 to the control circuit assembly 22 of the control end cover 2;

[0058] S4, the control end cover 2 is covered on the housing 11, and the connection between the control end cover 2 and the housing 11 is sealed and welded, so that the control end cover 2 and the inside of the housing 11 cooperate to form a liquid injection space, and the winding core 12 is located in the liquid injection space;

[0059] S5, injecting liquid into the injection space through the injection hole 25, wherein the injection hole 25 is provided at one end of the control end cover 2, and penetrates the control end cover 2 and communicates with the injection space;

[0060] S6, after the liquid injection is completed, the liquid injection hole 25 is sealed.

[0061] In this way, by providing an injection hole connected to the injection space on the control end cover, the core can be directly installed in the outer shell during production, and the control end cover is used for packaging and then the liquid is directly injected through the injection hole. There is no need to additionally inject and package the core and then install it in the outer shell, thereby effectively reducing the battery production steps and greatly improving the battery production efficiency. At the same time, since the core is directly installed in the outer shell, the original battery cell shell is eliminated, and the volume of the battery is effectively reduced, which facilitates the use of the battery.

[0062] Furthermore, in step S6, the following sub-steps are also included:

[0063] S61, presetting the blocking member 24, after the liquid injection is completed, presetting the blocking member 24 at one end of the liquid injection hole 25;

[0064] S62, press-seal the preset blocking member 24 into the injection hole 25. In specific implementation, the blocking member 24 can be pressed into the injection hole 25 by mechanical pressing to achieve blocking of the injection hole 25 by the blocking member 24.

[0065] The blocking member 24 and the injection hole 25 are in interference connection. Specifically, the blocking member 24 is a steel ball, the injection hole 25 is a round hole, and the outer diameter of the blocking member 24 is greater than the inner diameter of the injection hole 25 .

[0066] Furthermore, before step S5, it also includes: S5', baking the core 12 to remove water, so as to evaporate the liquid substances such as water in the core 12, so as to avoid affecting the liquid injected in step S5, and improve the stability of the battery.

[0067] During the specific implementation, in step S2, step S3 and step S4, laser welding is used to weld the negative pole tab of the winding core 12 to the bottom of the outer shell 11, the positive pole tab of the winding core 12 is welded to the control circuit component 21 of the control end cover 2, and the connection between the control end cover 2 and the outer shell 11 is welded.

[0068] Specifically, in step S3 , the positive electrode tab of the winding core 12 is welded to the connecting terminal 221 of the control end cover 2 , and in step S4 , the connection between the end cover shell 21 of the control end cover 2 and the outer shell 11 is welded.

[0069] Furthermore, the outer diameter of the outer shell 11 near the positive electrode ear is larger than the outer diameter near the negative electrode ear. Specifically, the outer shell 11 includes a reducing section 111 and a shell body 112. The outer diameter D1 of the reducing section 111 is smaller than the outer diameter D2 of the shell body 112. The end cover shell 21 is sleeved outside the reducing section 111, and its outer diameter D3 is larger than the outer diameter of the reducing section 111 and equal to the outer diameter D2 of the shell body 112. The end cover shell 21 is sleeved on the outer wall of the reducing section 111, and one end of the end cover shell 21 is welded to an end of the shell body 112 near the reducing section 111.

[0070] Preferably, a charging interface (not shown) is provided on the control circuit assembly 22 of the control end cover 2, the charging interface (not shown) is welded on the control circuit assembly 22, and the charging interface (not shown) is exposed from the second through hole 212 of the end cover shell 21, and the charging interface (not shown) can adopt a TYPE-C interface to improve the convenience of battery charging, thereby improving the convenience of product use.

[0071] In summary, by providing an injection hole connected to the injection space on the control end cover, the core can be directly installed in the outer shell during production, and the control end cover is used for packaging and then the liquid is directly injected through the injection hole. There is no need to additionally inject and package the core and then install it in the outer shell, thereby effectively reducing the battery production steps and greatly improving the battery production efficiency. At the same time, since the core is directly installed in the outer shell, the original battery cell shell is eliminated, and the volume of the battery is effectively reduced, which facilitates the use of the battery.

[0072] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for preparing an electrically controlled rechargeable battery, characterized in that: The preparation method is applied to an electrically controlled rechargeable battery, which comprises: a battery body and a control end cover, wherein the battery body comprises an outer shell and a winding core, wherein one end of the outer shell has an opening, the winding core is arranged in the outer shell, and both ends of the winding core have pole ears, wherein the pole ear at one end is connected to the bottom of the outer shell, and the control end cover comprises an end cover shell, a control circuit assembly and a positive terminal, wherein the control circuit assembly is arranged in the end cover shell, one end of the positive terminal is electrically connected to the control circuit assembly, and the other end thereof passes through the end cover shell and is exposed outside the end cover shell, the end cover shell is covered at the opening of the outer shell, the pole ear at the other end of the winding core is connected to the control circuit assembly, and the positive terminal and the bottom end of the outer shell respectively form the positive and negative poles of the battery; the control end cover also comprises at least one sealing member, the control end cover is provided with a liquid injection hole, the liquid injection hole penetrates from the outer wall of the control end cover to the inner part of the control end cover, so that the inside of the outer shell is connected with the outside of the control end cover, and the sealing member seals the liquid injection hole; The outer shell includes a reducing section and an outer shell body. The outer diameter of the reducing section is smaller than the outer diameter of the outer shell body. The end cover shell is sleeved outside the reducing section. The outer diameter of the end cover shell is larger than the outer diameter of the reducing section and equal to the outer diameter of the outer shell body. A first through hole is formed at one end of the end cover shell facing away from the battery body, and the other end of the positive terminal is exposed outside the end cover shell through the first through hole; The injection hole is disposed adjacent to the first through hole at one end of the end cover housing, and penetrates the end cover housing and the control circuit assembly in sequence; The preparation method comprises the following steps: S1, loading the roll core into the shell; S2, welding the negative electrode tab of the winding core to the bottom of the shell; S3, welding the positive electrode tab of the winding core to the control circuit assembly of the control end cover; S4, closing the control end cover on the housing, and sealing and welding the connection between the control end cover and the housing; the control end cover and the housing cooperate to form a liquid injection space; S5, injecting liquid into the injection space from the injection hole; the injection hole is provided in the control end cover and communicates with the injection space; S6, plugging the injection hole; The S6 further includes the following sub-steps: S61, preset plugging parts; S62, pressing and sealing the blocking member in the liquid injection hole; In S4, laser welding is used to weld the connection between the control end cover and the housing; In S2, the negative electrode tab of the winding core is welded to the bottom of the shell by laser welding; In S3, laser welding is used to weld the positive electrode tab of the winding wire to the control circuit assembly of the control end cover.

2. The method for preparing an electrically controlled rechargeable battery according to claim 1, characterized in that: In the S5, the above also includes: S5', baking the core to remove water.

3. The method for preparing an electrically controlled rechargeable battery according to claim 1, characterized in that: The blocking member is interference fit with the liquid injection hole.

4. The method for preparing an electrically controlled rechargeable battery according to claim 1, characterized in that: The control end cover has a charging interface, which is electrically connected to the control circuit component of the control end cover, and one end of the charging interface is exposed outside the control end cover.

5. The method for preparing an electrically controlled rechargeable battery according to claim 1, characterized in that: Before S1, the process also includes: S0, presetting a winding core, wherein the upper and lower ends of the winding core respectively have a positive electrode tab and a negative electrode tab.

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