A steel-cased battery

Abstract

This utility model relates to the field of battery technology and discloses a steel-cased battery, including a cell body, a circuit board assembly, a first solder pad, and a second solder pad. A positive electrode post is disposed on the top of the cell body, and a negative electrode connection portion is disposed on the side wall of the cell body. The circuit board assembly is disposed on the top of the cell body and located between the positive electrode post and the negative electrode connection portion. The positive electrode post is electrically connected to the circuit board assembly through the first solder pad, and the negative electrode connection portion is electrically connected to the circuit board assembly through the second solder pad. This utility model achieves the following technical effects: by placing the negative electrode connection portion on the side wall of the cell body and electrically connecting it to the circuit board assembly through the second solder pad, there is no need to significantly bend the second solder pad, reducing the difficulty of battery manufacturing. Simultaneously, it effectively reduces the length of the steel-cased battery, improving battery miniaturization.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a steel-cased battery. Background Technology

[0002] Currently, most wearable devices use metal-cased batteries, such as steel-cased and aluminum-cased batteries, especially small wearable devices like smart glasses and smartwatches. As the production requirements for these devices increasingly emphasize thinness and miniaturization, the batteries used in them also need to meet these requirements. Existing batteries for wearable devices typically have a positive and negative terminal on top of the cell, with the circuit board assembly positioned above the negative terminal. The positive and negative terminals are electrically connected to the circuit board assembly via solder pads. However, the solder pads connecting the negative terminal and the circuit board assembly require a 180-degree bend to achieve a proper connection. This 180-degree bend increases the overall length of the battery, hindering miniaturization and increasing the complexity of the manufacturing process, thus impeding efficient production. Utility Model Content

[0003] To address the shortcomings of the prior art, this utility model provides a steel-cased battery. By placing the negative electrode connection part on the side wall of the cell body and electrically connecting it to the circuit board assembly via a second solder pad, the manufacturing process of the battery is simplified without requiring significant bending of the second solder pad. At the same time, the length of the steel-cased battery is effectively reduced, thus improving the miniaturization of the battery.

[0004] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0005] This utility model provides a steel-cased battery, including a cell body, a circuit board assembly, a first solder pad, and a second solder pad;

[0006] The top of the battery cell body is provided with a positive electrode post, and the side wall of the battery cell body is provided with a negative electrode connection part. The circuit board assembly is located on the top of the battery cell body and between the positive electrode post and the negative electrode connection part. The positive electrode post is electrically connected to the circuit board assembly through the first solder pad, and the negative electrode connection part is electrically connected to the circuit board assembly through the second solder pad.

[0007] As a further description of the technical solution of this utility model, the second pad is L-shaped, and a first connection end and a second connection end are respectively provided at both ends of the second pad. The first connection end is welded to the negative electrode connection part, and the second connection end is welded to the circuit board assembly and located between the circuit board assembly and the battery cell body.

[0008] As a further description of the technical solution of this utility model, the outside of the first connecting end is covered with a first insulating adhesive paper.

[0009] As a further description of the technical solution of this utility model, the first pad is Z-shaped, and a third connection end and a fourth connection end are respectively provided at both ends of the first pad. The third connection end is welded to the positive electrode post, and the fourth connection end is welded to the circuit board assembly and is located between the circuit board assembly and the battery cell body.

[0010] As a further description of the technical solution of this utility model, a second insulating adhesive paper is attached to the outside of the third connecting end.

[0011] As a further description of the technical solution of this utility model, the diameter of the positive electrode post is 0.95~1.35mm, and the thickness of the battery cell body is 2.50~3.50mm.

[0012] As a further description of the technical solution of this utility model, the circuit board assembly includes a flexible circuit board and a SIP module. A first connection surface and a second connection surface are formed on the flexible circuit board, which are opposite to each other. The first connection surface faces the battery cell body. The first pad and the second pad are connected to the first connection surface, and the SIP module is connected to the second connection surface.

[0013] As a further description of the technical solution of this utility model, the battery cell body includes a battery cell housing, the positive electrode post and the circuit board assembly are disposed on the top of the battery cell housing, the negative electrode connection part is disposed on the side wall of the battery cell housing, and an insulating member is connected between the battery cell housing and the positive electrode post.

[0014] As a further description of the technical solution of this utility model, an adhesive layer is also provided on the top of the battery cell body, and a third connection surface and a fourth connection surface are formed on the adhesive layer, which are opposite to each other. The first solder pad and the second solder pad are connected to the third connection surface, and the battery cell body is connected to the fourth connection surface.

[0015] As a further description of the technical solution of this utility model, the adhesive layer is foam double-sided adhesive.

[0016] In summary, this utility model has at least the following advantages:

[0017] The steel-cased battery provided by this utility model sets the negative electrode connection part on the side wall of the cell body and electrically connects it to the circuit board assembly set on the top of the cell body through the second solder pad. This eliminates the need for the second solder pad to undergo extensive bending, reducing the manufacturing process difficulty of the steel-cased battery and improving battery production efficiency. At the same time, it effectively reduces the length of the steel-cased battery, thereby reducing the overall volume of the steel-cased battery and facilitating battery miniaturization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the steel-cased battery of Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the positive electrode post and the negative electrode connection part in Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the first pad in Embodiment 1 of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the second pad in Embodiment 1 of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the first insulating adhesive paper and the second insulating adhesive paper in Embodiment 1 of this utility model;

[0023] Figure 6 This is a top view of the positive electrode post and the battery cell body in Embodiment 2 of this utility model;

[0024] Figure 7 This is an exploded view of the circuit board assembly of Embodiment 2 of this utility model;

[0025] Figure 8 This is an explosion diagram of the steel-cased battery of Embodiment 3 of this utility model;

[0026] Figure 9 for Figure 8 Enlarged view of part A in the middle.

[0027] Marked in the image:

[0028] 1. Cell body; 11. Positive terminal; 12. Negative terminal connection; 13. Cell casing;

[0029] 2. Circuit board assembly; 21. Flexible circuit board; 211. First connecting surface; 212. Second connecting surface; 22. SIP module;

[0030] 3. First pad; 31. Third connector; 32. Fourth connector;

[0031] 4. Second pad; 41. First connector; 42. Second connector;

[0032] 5. First insulating tape; 6. Second insulating tape; 7. Insulating component;

[0033] 8. Adhesive layer; 81. Third bonding surface; 82. Fourth bonding surface. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] refer to Figures 1 to 5 The steel-cased battery provided in this embodiment includes a cell body 1, a circuit board assembly 2, a first solder pad 3, and a second solder pad 4. A positive electrode post 11 is disposed on the top of the cell body 1, and a negative electrode connection portion 12 is disposed on the side wall of the cell body 1. The circuit board assembly 2 is disposed on the top of the cell body 1 and located between the positive electrode post 11 and the negative electrode connection portion 12. The positive electrode post 11 is electrically connected to the lower surface of the circuit board assembly 2 through the first solder pad 3, and the negative electrode connection portion 12 is electrically connected to the lower surface of the circuit board assembly 2 through the second solder pad 4. In some embodiments, the negative electrode connection portion 12 may be provided with a contact piece for connecting to the second solder pad 4.

[0038] Since the negative electrode connection portion 12 is located on the side wall of the cell body 1, rather than below the circuit board assembly 2 on top of the cell body 1, there is no need to perform a significant bending process on the second solder pad 4 to achieve electrical connection between the negative electrode connection portion 12 and the circuit board assembly 2. This reduces the manufacturing process difficulty of the steel-cased battery and is beneficial to improving battery production efficiency. The second solder pad 4 can be attached to the surface of the cell body 1, so that the circuit board assembly 2 and the negative electrode connection portion 12 are respectively connected to the opposite ends of the second solder pad 4. The dimensions occupied by the second solder pad 4 in the length and width directions of the battery are only the thickness of the second solder pad 4 itself, which can be ignored. Even if the negative electrode connection portion 12 is located on the side wall of the cell body 1, since the negative electrode connection portion 12 itself only has contact pieces for connecting with the second solder pad 4, the thickness of the negative electrode connection portion 12 itself can also be ignored. Therefore, it will not increase the width of the battery. Thus, the length of the steel-cased battery is effectively reduced, thereby reducing the overall volume of the steel-cased battery and improving battery miniaturization.

[0039] In some embodiments, the second pad 4 is L-shaped, with a first connection end 41 and a second connection end 42 respectively at its two ends. The first connection end 41 is welded to the negative electrode connection portion 12, and the second connection end 42 is welded to the circuit board assembly 2 and located between the circuit board assembly 2 and the cell body 1. Since the first connection end 41 is located on the side wall of the cell body 1 and the second connection end 42 is located on the top of the cell body 1, setting the second pad 4 to an L-shape can more closely fit the shape of the connection between the side wall and the top of the cell body 1, thereby minimizing the proportion of the second pad 4 occupying the overall volume of the battery and achieving battery miniaturization.

[0040] In some embodiments, a first insulating tape 5 is affixed to the outside of the first connecting end 41. The first insulating tape 5 covers the welding area on the first connecting end 41. On the one hand, it can protect the welding joint between the negative electrode connection part 12 and the first connecting end 41 and prevent short circuit of the negative electrode connection part. On the other hand, it can reinforce the welding joint between the negative electrode connection part 12 and the first connecting end 41 and further consolidate the connection relationship between the negative electrode connection part 12 and the first connecting end 41.

[0041] In some embodiments, the first pad 3 is Z-shaped, with a third connection end 31 and a fourth connection end 32 respectively provided at both ends. The third connection end 31 is welded to the positive electrode post 11, and the fourth connection end 32 is welded to the circuit board assembly 2 and located between the circuit board assembly 2 and the cell body 1. It should be noted that the distance from the third connection end 31 to the top wall of the cell body 1 is greater than the distance from the fourth connection end 32 to the top wall of the cell body 1. Since the positive electrode post 11 is higher than the top wall of the cell body 1, and the circuit board assembly 2 can be set close to the top wall of the cell body 1, setting the first pad 3 to be Z-shaped can more closely match the positional relationship between the positive electrode post 11 and the circuit board assembly 2, minimizing the proportion of the first pad 3 occupying the overall volume of the battery, and further improving the miniaturization of the battery.

[0042] In some embodiments, a second insulating tape 6 is attached to the outside of the third connection terminal 31. The second insulating tape 6 covers the welding area on the third connection terminal 31, which can protect the welding joint between the positive terminal 11 and the third connection terminal 31 and prevent short circuit of the positive terminal 11. At the same time, it can further consolidate the connection between the positive terminal 11 and the third connection terminal 31.

[0043] In this embodiment, after the first pad 3 is soldered to the positive electrode post 11 and the circuit board assembly 2, the shear pull force of the first pad 3 can reach more than 20N. After the second pad 4 is soldered to the negative electrode connection part 12 and the circuit board assembly 2, the shear pull force can also reach more than 20N, which has strong reliability.

[0044] In this embodiment, the steel-cased battery, by placing the negative electrode connection portion on the side wall of the cell body and electrically connecting it to the circuit board assembly located on the top of the cell body via a second solder pad, eliminates the need for significant bending of the second solder pad, reducing the manufacturing difficulty of the steel-cased battery. Simultaneously, it effectively reduces the length of the steel-cased battery, thereby miniaturizing its overall size and improving its miniaturization. By setting the second solder pad to an L-shape, it more closely matches the shape of the connection between the side wall and the top of the cell body, minimizing the proportion of the second solder pad in the overall battery volume and further enhancing miniaturization. By setting the first solder pad to a Z-shape, it more closely matches the positional relationship between the positive electrode post and the circuit board assembly, minimizing the proportion of the first solder pad in the overall battery volume and further improving miniaturization. The use of first and second insulating tapes provides protection and reinforcement for the welded joints between the negative electrode connection portion and the first connection end, as well as the welded joints between the positive electrode post and the third connection end.

[0045] Example 2

[0046] As a further optimization of Example 1, refer to Figures 6 to 7The diameter D1 of the positive electrode post 11 is 0.95~1.35mm, the height of the positive electrode post 11 is 0.55~0.70mm, and the thickness D2 of the cell body 1 is 2.50~3.50mm. The positive electrode post 11 in this embodiment is extremely small, which allows for a smaller thickness of the cell body 1, effectively reducing the thickness of the steel-cased battery and improving its lightweight and thinness.

[0047] In one embodiment, the circuit board assembly 2 includes a flexible circuit board 21 and a SIP module 22. The flexible circuit board 21 has electrical connection terminals for connecting to external devices. It also has a first connection surface 211 and a second connection surface 212 positioned opposite to each other. The electrical connection terminals of the flexible circuit board 21 are located on one side of the first connection surface 211 and the second connection surface 212, and are perpendicular to both surfaces. The first connection surface 211 faces the battery cell body 1. The first pad 3 and the second pad 4 are both connected to the first connection surface 211, and the SIP module 22 is connected to the second connection surface 212.

[0048] Example 3

[0049] As a further optimization of Example 2, refer to Figures 8 to 9 The battery cell body 1 includes a battery cell housing 13, which is made of stainless steel. The battery cell housing 13 contains an electrolyte and a stacked electrode assembly. The positive electrode post 11 and the circuit board assembly 2 are located on the top of the battery cell housing 13, and the negative electrode connection part 12 is located on the side wall of the battery cell housing 13. An insulating member 7 connects the battery cell housing 13 and the positive electrode post 11.

[0050] In this embodiment, the entire cell housing 13 can be considered as a negative electrode, and the negative electrode connection portion 12 is only a designated part for welding with the second solder pad 4. Therefore, an insulating component 7 needs to be connected between the cell housing 13 and the positive electrode post 11. On the one hand, it can isolate the positive electrode post 11 and the cell housing 13 (i.e., the negative electrode) to prevent a short circuit between the positive and negative electrodes; on the other hand, it can provide a sealing effect to prevent leakage of electrolyte inside the cell housing 13.

[0051] In some embodiments, an adhesive layer 8 is further provided on the top of the battery cell body 1. A third connecting surface 81 and a fourth connecting surface 82, positioned opposite each other, are formed on the adhesive layer 8. The first solder pad 3 and the second solder pad 4 are connected to the third connecting surface 81, and the battery cell body 1 is connected to the fourth connecting surface 82. The adhesive layer 8 bonds and fixes the first solder pad 3 and the second solder pad 4 to the top wall of the battery cell body 1, preventing positional displacement of the circuit board assembly 2 connected to the first solder pad 3 and the second solder pad 4, and improving the connection stability of the circuit board assembly 2. In this embodiment, the adhesive layer 8 is double-sided foam adhesive. Double-sided foam adhesive has a certain degree of elasticity, can adapt to different connection gaps, and has strong applicability.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A steel-cased battery, characterized in that, It includes the battery cell body (1), the circuit board assembly (2), the first pad (3), and the second pad (4); The top of the battery cell body (1) is provided with a positive electrode post (11), and the side wall of the battery cell body (1) is provided with a negative electrode connection part (12). The circuit board assembly (2) is located on the top of the battery cell body (1) and between the positive electrode post (11) and the negative electrode connection part (12). The positive electrode post (11) is electrically connected to the circuit board assembly (2) through the first solder pad (3), and the negative electrode connection part (12) is electrically connected to the circuit board assembly (2) through the second solder pad (4).

2. The steel-cased battery according to claim 1, characterized in that, The second pad (4) is L-shaped. The two ends of the second pad (4) are respectively provided with a first connection end (41) and a second connection end (42). The first connection end (41) is welded to the negative electrode connection part (12), and the second connection end (42) is welded to the circuit board assembly (2) and located between the circuit board assembly (2) and the battery cell body (1).

3. The steel-cased battery according to claim 2, characterized in that, The first connecting end (41) is covered with a first insulating tape (5).

4. The steel-cased battery according to claim 1, characterized in that, The first pad (3) is Z-shaped. The first pad (3) has a third connection end (31) and a fourth connection end (32) at its two ends respectively. The third connection end (31) is welded to the positive electrode post (11), and the fourth connection end (32) is welded to the circuit board assembly (2) and located between the circuit board assembly (2) and the battery cell body (1).

5. The steel-cased battery according to claim 4, characterized in that, The third connecting end (31) is covered with a second insulating tape (6).

6. The steel-cased battery according to claim 1, characterized in that, The diameter of the positive electrode post (11) is 0.95~1.35mm, and the thickness of the cell body (1) is 2.50~3.50mm.

7. The steel-cased battery according to claim 1, characterized in that, The circuit board assembly (2) includes a flexible circuit board (21) and a SIP module (22). The flexible circuit board (21) has a first connection surface (211) and a second connection surface (212) that are opposite to each other. The first connection surface (211) faces the battery cell body (1). The first pad (3) and the second pad (4) are connected to the first connection surface (211). The SIP module (22) is connected to the second connection surface (212).

8. The steel-cased battery according to claim 1, characterized in that, The battery cell body (1) includes a battery cell housing (13), the positive electrode post (11) and the circuit board assembly (2) are disposed on the top of the battery cell housing (13), the negative electrode connection part (12) is disposed on the side wall of the battery cell housing (13), and an insulating member (7) is connected between the battery cell housing (13) and the positive electrode post (11).

9. The steel-cased battery according to claim 1, characterized in that, The top of the cell body (1) is also provided with an adhesive layer (8), on which a third connecting surface (81) and a fourth connecting surface (82) are formed opposite to each other. The first pad (3) and the second pad (4) are connected to the third connecting surface (81), and the cell body (1) is connected to the fourth connecting surface (82).

10. The steel-cased battery according to claim 9, characterized in that, The adhesive layer (8) is foam double-sided tape.

Images