Battery cell and lithium ion battery
By setting the positive terminal and a raised structure in the battery cell housing and directly connecting the PCB board, the problem of high production costs of existing buckle cells is solved, and structural simplification and safety performance are achieved.
Patent Information
- Application Number
- CN202323660444.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The production cost of existing buckle batteries is relatively high, mainly because the shell needs to be equipped with additional connectors after packaging, which increases the processing process and equipment requirements, resulting in complex processes and high costs.
A battery cell is designed, and the core body and positive electrode terminals are arranged in the housing. By forming the first and second protrusions on the housing to connect the PCB board, the assembly of the external connecting parts of the positive and negative electrodes of the battery cell is avoided. , simplifies the processing process and improves safety performance through insulation settings.
The processing technology of the buckle battery cell is simplified, the production cost is reduced, and the safety performance of the battery cell is improved by avoiding direct contact between the positive terminal and the shell, and the risk of shorting is avoided.
Smart Images
Figure CN222146318U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of secondary batteries, in particular to a battery core and a lithium ion battery. Background Art
[0002] After the existing button-type batteries are packaged in the shell, additional connectors need to be installed on the positive and negative poles of the battery cells, so that the positive and negative poles of the button-type batteries are extended outside the shell through the connectors, and some connection areas are insulated to facilitate the assembly of multiple button-type batteries or the electrical connection testing of the button-type batteries.
[0003] This arrangement increases the processing steps and equipment for the button-type battery, making the processing technology of the button-type battery more complicated, the processing time longer, and the processing cost higher, thereby increasing the production cost of the button-type battery. Utility Model Content
[0004] The technical problem to be solved by the embodiments of the utility model is to provide a battery cell and a lithium-ion battery to solve the problem of high production cost of button-type battery cells in the prior art.
[0005] The utility model discloses an electric core, comprising a winding core body, and an insulated positive terminal and a shell. The winding core body and the positive terminal are both arranged in the shell, and the negative pole of the winding core body is electrically connected to the shell, and the positive pole of the winding core body is electrically connected to the positive terminal; a first protrusion extending outside the shell is formed on the positive terminal, and a second protrusion corresponding to the first protrusion is formed on the shell, and the first protrusion and the second protrusion are used to connect a PCB board.
[0006] Optionally, the cross section of the first protrusion is a rectangle, the length of the rectangle is 1 to 3 mm, and the width of the rectangle is 1 to 3 mm.
[0007] Optionally, the first protrusion and the second protrusion have the same height.
[0008] Optionally, the height of the first protrusion and the second protrusion are both 2-4 mm.
[0009] Optionally, the length of the second protrusion on the shell accounts for 1 / 15 to 1 / 10.
[0010] Optionally, the shell includes a shell body and a cover plate, the cover plate is covered on the shell body, the positive terminal is arranged in the shell body through the cover plate, and an insulating member is arranged between the positive terminal and the cover plate; the second protrusion is connected to the shell body, and a positioning groove corresponding to the cover plate is opened on the inner wall of the shell body close to the second protrusion, and the cover plate is partially installed in the positioning groove.
[0011] Optionally, the positioning groove and the second protrusion are arranged correspondingly, and a length ratio of the positioning groove on the shell is the same as a length ratio of the second protrusion on the shell.
[0012] Optionally, the width of the positioning groove is 1 / 2 to 2 / 3 of the thickness of the shell body, and the width of the positioning groove is 0.1 to 0.15 mm.
[0013] Optionally, the height of the positioning groove is greater than the thickness of the cover plate, and the height of the positioning groove is 0.15-0.2 mm.
[0014] The utility model also discloses a lithium ion battery, comprising a PCB board and the above-mentioned battery core, wherein the first protrusion and the second protrusion are respectively connected to the PCB board, so that the battery core is electrically connected to the PCB board.
[0015] Compared with the prior art, the battery cell and lithium-ion battery provided by the embodiment of the utility model have the following beneficial effects: by providing a first protrusion integrated with the positive terminal and a second protrusion integrated with the shell, the battery cell does not need to be equipped with additional connectors at the positive and negative electrodes, so that the battery cell has a simple structure, simplifies the processing technology of the button-type battery cell, and thus reduces the production cost of the button-type battery cell. In addition, the positive terminal and the shell that are insulated can avoid the risk of short circuit of the battery cell due to direct contact between the positive terminal and the shell, thereby improving the safety performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:
[0017] Figure 1 It is a cross-sectional schematic diagram of a battery cell provided by an embodiment of the utility model;
[0018] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;
[0019] Figure 3 It is a schematic diagram of the structure of the positive terminal provided by the embodiment of the utility model from a top view;
[0020] Figure 4 A schematic diagram of the extended state of the shell body provided in an embodiment of the utility model.
[0021] The reference numerals in the figures are:
[0022] 1. Battery cell; 11. Core body; 12. Positive terminal; 121. First protrusion; 13. Shell; 131. Second protrusion; 132. Shell body; 1321. Positioning groove; 133. Cover plate; 14. Insulator. DETAILED DESCRIPTION
[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.
[0024] like Figures 1 to 4 As shown, an embodiment of the utility model provides a battery core 1, including a core body 11, and an insulated positive terminal 12 and a shell 13. The core body 11 and the positive terminal 12 are both arranged in the shell 13, and the negative pole of the core body 11 is electrically connected to the shell 13, and the positive pole of the core body 11 is electrically connected to the positive terminal 12; a first protrusion 121 extending to the outside of the shell 13 is formed on the positive terminal 12, and a second protrusion 131 corresponding to the first protrusion 121 is formed on the shell 13, and the first protrusion 121 and the second protrusion 131 are used to connect to the PCB board.
[0025] By providing a first protrusion 121 integrated with the positive terminal 12 and a second protrusion 131 integrated with the shell 13, the battery cell 1 does not need to be equipped with additional connectors at the positive and negative electrodes, so that the battery cell 1 has a simple structure, simplifies the processing technology of the button-type battery cell 1, and thus reduces the production cost of the button-type battery cell 1. In addition, the positive terminal 12 and the shell 13 that are insulated can avoid the risk of short-circuiting the battery cell 1 due to direct contact between the positive terminal 12 and the shell 13, thereby improving the safety performance of the battery cell 1.
[0026] Further, see Figure 3 The cross section of the first protrusion 121 is a rectangle, the length of the rectangle is 1 to 3 mm, and the width of the rectangle is 1 to 3 mm. Figure 3 In the figure, a represents the length of the rectangle, and b represents the width of the rectangle. The rectangular shape facilitates the connection between the PCB board and the first protrusion 121, and facilitates the clamping and fixing of the first protrusion 121 when the battery cell 1 is tested.
[0027] In an optional embodiment, the length of the rectangle may be 1 mm, 2 mm, 3 mm, etc., and the width of the rectangle may be 1 mm, 2 mm, 3 mm, etc.
[0028] Furthermore, if Figure 1 As shown, Figure 1 In FIG. 1 , e represents the height of the first protrusion 121, and f represents the height of the second protrusion 131. The first protrusion 121 and the second protrusion 131 have the same height. This arrangement can facilitate the electrical connection between the PCB board and the first protrusion 121 and the second protrusion 131, and can also prevent the battery cell 1 from being negatively affected by electromagnetic induction in the working state.
[0029] Specifically, the height of the first protrusion 121 and the second protrusion 131 are both 2-4 mm.
[0030] In an optional embodiment, the height of the first protrusion 121 may be 2 mm, 3 mm, 4 mm, etc. The height of the first protrusion 121 may be 2 mm, 3 mm, 4 mm.
[0031] Specifically, the length ratio of the second protrusion 131 on the housing 13 is 1 / 15 to 1 / 10. It should be noted that the length ratio refers to the length ratio of the side of the housing 13 occupied by the second protrusion 131 when the housing 13 is in a rectangular extended state.
[0032] In an optional embodiment, the length of the second protrusion 131 on the shell 13 accounts for 1 / 15, 1 / 12, 1 / 10, etc.
[0033] Further, see Figure 1 The shell 13 includes a shell body 132 and a cover plate 133, the cover plate 133 is covered on the shell body 132, the positive terminal 12 is arranged in the shell body 132 through the cover plate 133, and an insulating member 14 is arranged between the positive terminal 12 and the cover plate 133; the second protrusion 131 is connected to the shell body 132, and a positioning groove 1321 corresponding to the cover plate 133 is opened on the inner wall of the shell body 132 close to the second protrusion 131, and the cover plate 133 is partially installed in the positioning groove 1321.
[0034] The insulating member 14 can play an insulating role, avoiding the short circuit between the positive and negative electrodes of the battery cell 1 due to direct contact between the positive terminal 12 and the cover plate 133, thereby improving the safety performance of the battery cell 1. The positioning groove 1321 can not only facilitate the installation of the cover plate 133, but also facilitate the positioning welding between the cover plate 133 and the shell body 132.
[0035] It should be noted that in actual production applications, the positive terminal 12, the insulating member 14 and the cover plate 133 are connected by hot pressing and laminating.
[0036] Further, see Figure 2 and Figure 4 The positioning groove 1321 is arranged correspondingly to the second protrusion 131, and the length ratio of the positioning groove 1321 on the housing 13 is the same as the length ratio of the second protrusion 131 on the housing 13. This arrangement facilitates the processing and positioning of the positioning groove 1321 and the second protrusion 131, and reduces the processing difficulty of the shell body 132.
[0037] Specifically, Figure 2 As shown, Figure 2 In FIG. 1 , c represents the width of the positioning groove 1321. The width of the positioning groove 1321 is 1 / 2 to 2 / 3 of the thickness of the shell body 132, and the width of the positioning groove 1321 is 0.1 to 0.15 mm. The width of the positioning groove 1321 is set in a manner that ensures that a sufficient contact area is formed between the cover plate 133 and the positioning groove 1321, so as to facilitate the welding positioning between the cover plate 133 and the shell body 132, thereby forming a good connection strength between the cover plate 133 and the shell body 132.
[0038] In an optional embodiment, the width of the positioning groove 1321 is 1 / 2, 7 / 12, 2 / 3, etc. of the thickness of the shell body 132. The width of the positioning groove 1321 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, etc.
[0039] Specifically, see Figure 2 , Figure 2 In FIG. 1 , d represents the height of the positioning groove 1321. The height of the positioning groove 1321 is greater than the thickness of the cover plate 133, and the height of the positioning groove 1321 is 0.15 to 0.2 mm. The height setting of the positioning groove 1321 can facilitate the insertion of the cover plate 133 into the positioning groove 1321, so as to improve the installation efficiency of the cover plate 133.
[0040] In an optional embodiment, the height of the positioning groove 1321 can be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, etc.
[0041] In an optional embodiment, the positive electrode of the core body 11 and the positive terminal 12 , as well as the negative electrode of the core body 11 and the shell body 132 are connected by laser welding.
[0042] The utility model also discloses a lithium-ion battery, including a PCB board and the above-mentioned battery cell 1, wherein the first protrusion 121 and the second protrusion 131 are respectively connected to the PCB board so that the battery cell 1 is electrically connected to the PCB board. The first protrusion 121 and the second protrusion 131 can facilitate the electrical connection between the battery cell 1 and the PCB board to ensure that a plurality of battery cells 1 can form a lithium-ion battery and control and protect the battery cell 1 through the PCB board. The battery cell 1 includes the structure and beneficial effects of the battery cell 1 in the aforementioned embodiment. The structure and beneficial effects of the battery cell 1 have been described in detail in the aforementioned embodiment and will not be repeated here.
[0043] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.
Claims
1. A battery cell, characterized in that: It includes a winding core body, and an insulating positive terminal and a shell, wherein the winding core body and the positive terminal are both arranged in the shell, and the negative electrode of the winding core body is electrically connected to the shell, and the positive electrode of the winding core body is electrically connected to the positive terminal; A first protrusion extending outside the shell is formed on the positive terminal, and a second protrusion corresponding to the first protrusion is formed on the shell. The first protrusion and the second protrusion are used to connect to the PCB board.
2. The battery cell according to claim 1, characterized in that: The cross section of the first protrusion is a rectangle, the length of the rectangle is 1 to 3 mm, and the width of the rectangle is 1 to 3 mm.
3. The battery cell according to claim 2, characterized in that: The first protrusion and the second protrusion have the same height.
4. The battery cell according to claim 3, characterized in that: The heights of the first protrusion and the second protrusion are both 2-4 mm.
5. The battery cell according to claim 1, characterized in that: The length of the second protrusion on the shell accounts for 1 / 15 to 1 / 10.
6. The battery cell according to claim 1, characterized in that: The shell comprises a shell body and a cover plate, wherein the cover plate is disposed on the shell body, the positive terminal passes through the cover plate and is disposed in the shell body, and an insulating member is disposed between the positive terminal and the cover plate; The second protrusion is connected to the shell body, and a positioning groove corresponding to the cover plate is opened on the inner wall of the shell body close to the second protrusion, and the cover plate is partially installed in the positioning groove.
7. The battery cell according to claim 6, characterized in that: The positioning groove is arranged corresponding to the second protrusion, and a length ratio of the positioning groove on the shell is the same as a length ratio of the second protrusion on the shell.
8. The battery cell according to claim 6, characterized in that: The width of the positioning groove is 1 / 2 to 2 / 3 of the thickness of the shell body, and the width of the positioning groove is 0.1 to 0.15 mm.
9. The battery cell according to claim 6, characterized in that: The height of the positioning groove is greater than the thickness of the cover plate, and the height of the positioning groove is 0.15-0.2 mm.
10. A lithium ion battery, characterized in that: It comprises a PCB board and the battery cell according to any one of claims 1 to 9, wherein the first protrusion and the second protrusion are respectively connected to the PCB board, so that the battery cell is electrically connected to the PCB board.