Battery and electronic equipment

Abstract

The utility model discloses a battery and electronic equipment. The battery comprises a shell, the shell comprises a side wall, and the first end of the side wall is an opening part; the side wall comprises a first wall section, a second wall section and a connecting wall section; the projection of the second wall section is located in the projection range of the first wall section in the height direction of the shell; one end of the connecting wall section is connected with the first wall section, and the other end of the connecting wall section is connected with the second wall section; the opening part is formed in the end part, far away from the first wall section, of the second wall section; the bottle cap further comprises a cap body, the cap body covers the opening part and is connected with the second wall section in a sealed mode, and the outer side wall of the cap body is located on the inner side of the first wall section.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, and more particularly, to a battery and an electronic device. BACKGROUND

[0002] In recent years, with the development of science and technology, various electronic products have entered millions of households and become necessities of life. As the power source of electronic products, the performance of batteries in all aspects is one of the important indicators for measuring the quality of electronic products.

[0003] The structure of the battery in the prior art, especially the hard-shell battery, still needs to be improved. For example, since the shell is basically flush with the cover plate, it is not possible to apply pressure to the battery shell when the battery is being formed, that is, the battery cannot be formed under pressure.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. SUMMARY

[0005] One object of the present application is to provide a new technical solution for a battery and an electronic device.

[0006] According to a first aspect of the present application, a battery is provided, comprising:

[0007] a shell, the shell comprising a side wall, a first end of the side wall being an open portion;

[0008] the side wall comprises a first wall segment, a second wall segment and a connecting wall segment; in the height direction of the shell, the projection of the second wall segment is located within the projection range of the first wall segment; one end of the connecting wall segment is connected with the first wall segment, and the other end is connected with the second wall segment; wherein the end of the second wall segment away from the first wall segment forms the open portion;

[0009] a cap, the cap being arranged on the open portion and being in sealing connection with the second wall segment, the outer side wall of the cap being located on the inner side of the first wall segment.

[0010] Optionally, the outer side wall of the cap is flush with the second wall segment, or the outer side wall of the cap is located on the inner side of the second wall segment.

[0011] Optionally, the width of the connecting wall segment between the first wall segment and the second wall segment is greater than the thickness of the first wall segment.

[0012] Optionally, the connecting wall segment is inclinedly arranged at a predetermined angle relative to the first wall segment and the second wall segment.

[0013] Optionally, the predetermined angle is greater than or equal to 120° and less than or equal to 150°.

[0014] Optionally, the shell further comprises a bottom wall, the side wall has a second end opposite to the first end, and the second end of the side wall is connected with the bottom wall; the bottom wall is located at the inner side of the first wall section.

[0015] Optionally, the bottom wall and the first wall section are connected through a round corner structure.

[0016] Optionally, the battery further comprises a winding core, the winding core is arranged in the shell, and a width of the winding core is not less than a width of the second wall section.

[0017] Optionally, the battery further comprises a conductive piece, a first tab and a second tab, the conductive piece is insulatedly connected with the cap, the first tab is connected with the cap, and the second tab is connected with the conductive piece.

[0018] According to a second aspect of the present application, an electronic device is provided, which comprises the battery according to the first aspect.

[0019] In the battery provided in the embodiments of the present application, since the side wall of the shell forms a structure of a necked opening at the connecting wall section and the second wall section, the battery is suitable for pressure formation treatment; thus, a more stable electrode structure, in particular, a solid electrolyte interface film, can be formed, and battery reaction is more sufficient, so that the energy density and the service life of the battery are increased.

[0020] Other characteristics and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1 is a sectional structure schematic diagram of a battery according to an embodiment of the present application;

[0023] Figure 2 is a whole structure schematic diagram of a battery according to an embodiment of the present application;

[0024] Figure 3 is a force schematic diagram of a battery according to an embodiment of the present application.

[0025] Legend of reference signs:

[0026] 1. battery; 11. housing; 110. side wall; 111. bottom wall; 1100. opening part; 1101. first wall segment; 1102. second wall segment; 1103. connecting wall segment; 12. cap; 13. roll core; 14. conductive member; 141. conductive nail; 142. conductive sheet; 15. first tab; 16. second tab; 17. sealing insulating member; 18. steel ball. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the examples, as well as the numerical expressions and values, are not limitations on the scope of the present application, unless otherwise specifically stated.

[0028] The following description of at least one example embodiment is merely illustrative in nature and is in no way intended to limit the scope of the application or its application or uses.

[0029] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0030] In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative, and not as a limitation. Thus, other examples of the example embodiments can have different values.

[0031] It should be noted that like reference numerals and letters refer to like items in the drawings, and as a result, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0032] Reference Figures 1-3 As shown, according to one embodiment of the present application, a battery 1 is provided. The battery 1 includes a housing 11, the housing 11 including a side wall 110 and a bottom wall 111, the side wall 110 having first and second ends disposed opposite to each other; the first end of the side wall 110 being an opening part 1100, the second end of the side wall 110 being connected with the bottom wall 111;

[0033] The side wall 110 includes a first wall segment 1101, a second wall segment 1102, and a connecting wall segment 1103; the second wall segment 1102 is located inside the first wall segment 1101, that is, in the height direction of the housing 11, a projection of the second wall segment 1102 is located within the projection range of the first wall segment 1101; one end of the connecting wall segment 1103 is connected with the first wall segment 1101, and the other end is connected with the second wall segment 1102; wherein, an end of the second wall segment 1102 away from the first wall segment 1101 forms the opening part 1100;

[0034] Further comprising a cap 12, the cap 12 covers the opening part 1100 and is sealingly connected with the second wall segment 1102, and the outer side wall of the cap 12 is located at the inner side of the first wall segment 1101.

[0035] In the battery provided by the embodiment of the present application, the side wall 110 of the shell 11 comprises a three-segment structure, i.e., the first wall segment 1101, the second wall segment 1102 and the connecting wall segment 1103; along the height direction of the shell 11, the first wall segment 1101, the connecting wall segment 1103 and the second wall segment 1102 are sequentially connected, and the second wall segment 1102 is located at the inner side of the first wall segment 1101, and the opening diameter formed by the second wall segment 1102 is smaller than the opening diameter formed by the first wall segment 1101; that is, the side wall 110 forms a kind of necked structure at the connecting wall segment 1103 and the second wall segment 1102. The cap 12 covers the opening part 1100 and is sealingly connected with the second wall segment 1102, and the outer side wall of the cap 12 does not exceed the range of the first wall segment 1101, that is, the cap 12 is located at the inner side of the first wall segment 1101.

[0036] The battery is suitable for pressure formation treatment due to the shell 11 with the above structure. Specifically, while the battery is subjected to formation treatment, pressure is applied to the shell 11 at the first wall segment 1101 to activate the active material in the battery and form a dense SEI film. The pressure formation treatment has obvious advantages compared with the ordinary formation treatment, for example, the external pressure applied in the pressure formation process can effectively increase the contact area of the electrode material, thereby reducing the electrode gap and enhancing the electron and ion conduction efficiency between materials. In addition, the pressure formation is helpful to form a more stable electrode structure, especially the solid electrolyte interface film (SEI film).

[0037] The battery shell in the prior art does not comprise the necked structure formed by the connecting wall segment 1103 and the second wall segment 1102, so that when pressure is applied to the shell, the pressure is also applied to the cover plate; since the cover plate and the shell are both made of aluminum material, and the thickness of the cover plate is much larger than the thickness of the shell, under the same pressure, the cover plate is difficult to deform as the shell, so that the cover plate interferes with the pressure formation.

[0038] For the battery provided by the embodiment of the present application, since the shell 11 has the above structure, when pressure F is applied to the first wall segment 1101, the pressure force can avoid the cap 12, that is, the pressure is only applied to the first wall segment 1101 and not to the cap 12; therefore, the cap 12 does not interfere with the pressure formation.

[0039] In summary, the battery provided by the embodiments of the present application is suitable for pressure formation treatment due to the shell 11 with the above structure, so that a more stable electrode structure, especially a solid electrolyte interface film, can be formed, and the battery reaction is more complete, thereby increasing the energy density and the service life of the battery.

[0040] Referring to Figures 1-2 In one embodiment, as shown in FIG. 11, the outer side wall of the cap 12 is flush with the second wall segment 1102, or the outer side wall of the cap 12 is located inside the second wall segment 1102.

[0041] In this specific example, the outer side wall of the cap 12 is flush with the second wall segment 1102, or the outer side wall of the cap 12 is located inside the second wall segment 1102, so that the cap 12 can be more reliably ensured not to interfere with the pressure force when the pressure is applied to the first wall segment 1101.

[0042] Referring to Figures 1-2 In one embodiment, as shown in FIG. 11, the width of the connecting wall segment 1103 between the first wall segment 1101 and the second wall segment 1102 is greater than the thickness of the first wall segment 1101.

[0043] In this specific example, the width of the connecting wall segment 1103 between the first wall segment 1101 and the second wall segment 1102, i.e., the distance by which the second wall segment 1102 is contracted relative to the first wall segment 1101, is greater than the thickness of the first wall segment 1101, so that the first wall segment 1101 has sufficient deformation allowance relative to the second wall segment 1102 when the pressure is applied to the first wall segment 1101.

[0044] Referring to Figures 1-2 In one embodiment, as shown in FIG. 11, the connecting wall segment 1103 is inclined at a predetermined angle relative to the first wall segment 1101 and the second wall segment 1102.

[0045] In this specific example, the connecting wall segment 1103 is not connected perpendicularly to the first wall segment 1101 and the second wall segment 1102, but is inclined at a predetermined angle relative to the first wall segment 1101 and the second wall segment 1102, so that stress concentration can be avoided at the junction between the first wall segment 1101 and the connecting wall segment 1103, and at the junction between the connecting wall segment 1103 and the second wall segment 1102.

[0046] Referring to Figures 1-2 In one embodiment, as shown in FIG. 11, the predetermined angle is greater than or equal to 120° and less than or equal to 150°.

[0047] In this specific example, the predetermined angle is greater than or equal to 120° and less than or equal to 150°, so as to ensure the shrinkage distance of the second wall segment 1102 relative to the first wall segment 1101 while ensuring that there is no stress concentration problem.

[0048] Referring to Figures 1-2 In one embodiment, the bottom wall 111 is located on the inner side of the first wall segment 1101.

[0049] In this specific example, the bottom wall 111 is located on the inner side of the first wall segment 1101, so that the bottom wall 111 does not interfere with the pressure force when the pressure is applied to the first wall segment 1101.

[0050] Referring to Figures 1-2 In one embodiment, the bottom wall 111 is connected to the first wall segment 1101 through a rounded corner structure.

[0051] In this specific example, the bottom wall 111 is connected to the first wall segment 1101 through a rounded corner structure, so as to avoid the stress concentration at the junction of the bottom wall 111 and the first wall segment 1101.

[0052] Referring to Figures 1-2 In one embodiment, the battery further comprises a winding core 13, the winding core 13 is arranged in the shell 11, the width of the winding core 13 is not less than the width of the second wall segment 1102, and the height of the winding core 13 is not greater than the height of the first wall segment 1101.

[0053] In this specific example, the dimensions of the winding core 13 in the height direction, the width direction and the thickness direction are matched with the first wall segment 1101, so that the dimensions of the winding core 13 are not affected by the shell 11 which is provided with the shrinkage structure formed by the connecting wall segment 1103 and the second wall segment 1102, and the energy density of the battery is ensured.

[0054] Referring to Figures 1-2 In one embodiment, the battery further comprises a conductive piece 14, a first tab 15 and a second tab 16, the conductive piece 14 is insulatedly connected to the cap 12, the first tab 15 is connected to the cap 12, and the second tab 16 is connected to the conductive piece 14.

[0055] In this specific example, for example, the conductive piece 14 comprises a conductive pin 141 and a conductive sheet 142 which are connected to each other, the conductive sheet 142 is connected to the second tab 16, and the end of the conductive pin 141 is exposed to the cap 12. The conductive pin 141 and the cap 12, and the conductive sheet 142 and the cap 12 are both isolated by a sealing insulating piece 17. The cap 12 is also provided with a liquid injection hole which is sealed by a steel ball 18.

[0056] The battery preparation method provided in the embodiments of the present application comprises:

[0057] S101, providing a shell 11, the shell 11 having an opening part 1100, the roll core 13 being placed in the shell 11 via the opening part 1100;

[0058] S102, performing a compression treatment on the shell 11 at a position close to the opening part 1100, so that the shell 11 forms a structure comprising a first wall segment 1101, a second wall segment 1102 and a connecting wall segment 1103; the second wall segment 1102 is located on the inner side of the first wall segment 1101, one end of the connecting wall segment 1103 is connected with the first wall segment 1101 and the other end is connected with the second wall segment 1102; wherein the end of the second wall segment 1102 away from the first wall segment 1101 forms the opening part 1100;

[0059] S103, covering the cap 12 on the opening part 1100, and connecting the first tab 15 with the cap 12 and connecting the second tab 16 with the conductive piece 14;

[0060] S104, injecting electrolyte into the shell 11 via the liquid injection hole formed on the cap 12 and sealing the liquid injection hole;

[0061] S105, performing formation treatment on the battery under the condition that pressure is applied to the first wall segment 1101.

[0062] In the battery preparation method provided in the embodiments of the present application, the compression treatment is performed on the shell 11 to form a necked structure comprising the connecting wall segment 1103 and the second wall segment 1102, so that the cap 12 does not interfere with the pressurized formation when the formation treatment is performed on the battery under the condition that pressure is applied to the first wall segment 1101.

[0063] In addition, in the battery preparation method provided in the embodiments of the present application, the roll core 13 is first placed in the shell 11, and then the compression treatment is performed on the shell 11; therefore, the size of the roll core 13 is not affected by the existence of the necked structure, and the energy density of the battery is ensured.

[0064] According to another embodiment of the present application, an electronic device is provided, which comprises the battery as described above.

[0065] In the above embodiments, the differences between the various embodiments are mainly described, and the optimization features different between the various embodiments can be combined to form a more optimal embodiment as long as they are not contradictory. In view of the brevity of the writing, the details are not described herein.

[0066] While certain embodiments of the application have been described in detail as examples, those skilled in the art should appreciate that other embodiments can be practiced without the details (e.g., not all components, some permutations, etc.) provided herewith and with the possession of the general knowledge acquired over the years and should not be construed to limit the scope of the application to the particulars of the embodiments given. The scope of the application should be determined from the following claims.

Claims

1. A battery, characterized in that, The battery includes: The housing (11) includes a side wall (110), the first end of which is an opening (1100); The sidewall (110) includes a first wall segment (1101), a second wall segment (1102), and a connecting wall segment (1103); along the height direction of the housing (11), the projection of the second wall segment (1102) is located within the projection range of the first wall segment (1101); one end of the connecting wall segment (1103) is connected to the first wall segment (1101), and the other end is connected to the second wall segment (1102); wherein, the end of the second wall segment (1102) away from the first wall segment (1101) forms the opening (1100); A cap (12) is placed over the opening (1100) and is sealed to the second wall section (1102). The outer wall of the cap (12) is located inside the first wall section (1101).

2. The battery according to claim 1, characterized in that, The outer wall of the cap (12) is flush with the second wall segment (1102), or the outer wall of the cap (12) is located inside the second wall segment (1102).

3. The battery according to claim 1, characterized in that, The width of the connecting wall segment (1103) located between the first wall segment (1101) and the second wall segment (1102) is greater than the thickness of the first wall segment (1101).

4. The battery according to claim 1, characterized in that, The connecting wall segment (1103) is inclined at a predetermined angle relative to the first wall segment (1101) and the second wall segment (1102).

5. The battery according to claim 4, characterized in that, The predetermined angle is greater than or equal to 120° and less than or equal to 150°.

6. The battery according to claim 1, characterized in that, The housing (11) further includes a bottom wall (111), and the side wall (110) has a second end disposed opposite to its first end, the second end of the side wall (110) being connected to the bottom wall (111); the bottom wall (111) is located inside the first wall segment (1101).

7. The battery according to claim 6, characterized in that, The bottom wall (111) is connected to the first wall segment (1101) by a rounded corner structure.

8. The battery according to claim 1, characterized in that, The battery also includes a core (13) disposed inside the housing (11), the width of the core (13) being not less than the width of the second wall segment (1102).

9. The battery according to claim 8, characterized in that, The battery also includes a conductive element (14), a first tab (15), and a second tab (16). The conductive element (14) is insulated from the cap (12), the first tab (15) is connected to the cap (12), and the second tab (16) is connected to the conductive element (14).

10. An electronic device, characterized in that, The electronic device includes a battery (1) as claimed in any one of claims 1-9.

Images