Pin structure, cover plate assembly, and battery

Abstract

A pin structure, a cover plate assembly and a battery. The pin structure comprises a terminal post connection portion (1) and a tab connection portion (3), wherein the tab connection portion (3) comprises a connecting plate (31) and a mounting portion (32); the connecting plate (31) comprises a first connection sub-portion (3121) and a second connection sub-portion (3122), which are connected to each other; the first connection sub-portion (3121) is provided in a flat-plate shape and is connected to the side of a main body portion (311) in a second direction; the second connection sub-portion (3122) is provided in an arc shape and is connected to the mounting portion (32); and a machined groove (4) extending in a first direction is provided on a connecting portion (312).

Description

Pin structure, cover plate assembly and battery

[0001] This application claims priority to Chinese Patent Application No. 202421409156.0, filed on June 19, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a pin structure, a cover plate assembly, and a battery. Background Technology

[0003] In rechargeable batteries, to better weld the tabs, the sub-pins that connect to the core tabs are usually bent. The smaller the bending gap of the sub-pins, the better. In related technologies, grooves are usually set near the bending part of the pins to reduce the bending gap of the sub-pins. The grooves are usually set on the sub-pins or on the bending part connecting the sub-pins. Invention Overview

[0004] However, when the groove is placed on the sub-pin, it reduces the effective width for soldering the sub-pin to the tab. When the groove is placed on the bend connecting the sub-pin, the two opposite groove walls tend to abut against each other when the sub-pin is bent, thus interfering with the bending of the sub-pin.

[0005] This application provides a pin structure, including:

[0006] The electrode connection portion is configured to connect with the electrode post; and

[0007] The electrode connection portion includes a connecting plate and a mounting portion. The connecting plate includes a main body portion and a connecting portion. The main body portion extends along a first direction. One end of the main body portion in the first direction is connected to the electrode post connection portion. The mounting portion is configured to connect to the electrode tab.

[0008] The connecting plate includes a first sub-connecting part and a second sub-connecting part that are connected to each other. The first sub-connecting part is flat and connected to one side of the main body in the second direction. The second sub-connecting part is arc-shaped and connected to the mounting part. The first direction and the second direction intersect. The connecting part is provided with a groove extending along the first direction. A part of the groove is provided on the first sub-connecting part and another part is provided on the second sub-connecting part. The second sub-connecting part is bent relative to the first sub-connecting part at the groove.

[0009] This application also provides a cover plate assembly, including:

[0010] Top cover, with pole posts installed on it; and

[0011] The pin structure includes a pin structure and a terminal connection part connected to the terminal.

[0012] This application also provides a battery, comprising:

[0013] Core package, including the core package body and the tabs extending from the core package body; and

[0014] Cover assembly, including cover assembly;

[0015] The electrode tab is connected to the mounting part. Beneficial effects

[0016] The pin structure provided in this application has grooves on the connecting part. Part of the groove is located on the first sub-connecting part, which is flat, and the other part is located on the second sub-connecting part, which is arc-shaped. That is, the groove is not completely located on the second sub-connecting part, which is arc-shaped. Therefore, when the mounting part is bent, the two opposite groove walls will not abut against each other. In other words, the groove in the embodiment of this application can not only reduce the bending gap of the mounting part, but also avoid interference with the bending of the mounting part. In addition, the groove is not located on the mounting part, so it will not occupy the welding area between the mounting part and the tab, providing more space for the pin to be welded on the mounting part and increasing the effective welding area between the tab and the pin structure. Attached Figure Description

[0017] Figure 1 is a perspective view of the pin structure provided in this application;

[0018] Figure 2 is a three-dimensional schematic diagram of the pin structure provided in this application from another perspective;

[0019] Figure 3 is a three-dimensional schematic diagram of the mounting portion of the pin structure provided in this application after bending.

[0020] Figure 4 is a schematic diagram of the bent mounting portion in the pin structure provided in this application.

[0021] Figure 5 is a schematic diagram of the pin structure provided in this application, showing the unbent mounting portion.

[0022] Figure 6 is an enlarged view of point A in Figure 5;

[0023] Figure 7 is an enlarged view of point A in Figure 5;

[0024] Figure 8 is an enlarged view of point A in Figure 5;

[0025] Figure 9 is a perspective view of the cover plate assembly provided in this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Pole post connection part; 2. Pole post; 3. Pole lug connection part; 31. Connecting plate; 311. Main body part; 312. Connecting part; 32. Mounting part; 3121. First sub-connecting part; 3122. Second sub-connecting part; 4. Groove; 5. First surface; 51. First sub-surface; 6. Second surface; 7. Fusible groove; 8. Pole post fixing hole; 9. Top cover. Embodiments of the present invention

[0028] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" 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 application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can 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 top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, 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 application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0031] This application proposes a pin structure, and Figures 1 to 9 show some embodiments of this application.

[0032] Please refer to Figures 1 and 2. In some embodiments of this application, the pin structure includes a terminal connection portion 1, which extends along a third direction X and is configured to connect with a terminal 2.

[0033] In some embodiments of this application, the pin structure further includes a tab connection portion 3. The tab connection portion 3 includes a connecting plate 31 and a mounting portion 32. The connecting plate 31 includes a main body portion 311 and a connecting portion 312. The main body portion 311 extends along a first direction Z. One end of the main body portion 311 in the first direction Z is connected to the pole post connection portion 1. The connecting portion 312 includes a first sub-connecting portion 3121 and a second sub-connecting portion 3122 that are connected to each other. The first sub-connecting portion 3121 is flat and connected to one side of the main body portion 311 in the second direction Y. The second sub-connecting portion 3122 is arc-shaped and connected to the mounting portion 32. The mounting portion 32 is configured to connect to the tab. The mounting portion 32 can be bent toward the main body portion 311 in a third direction X away from the pole post connection portion 1 through the connecting portion 312. The side of the mounting portion 32 away from the main body portion 311 in the second direction Y is used for fixing the tab.

[0034] The connecting portion 312 is provided with a groove 4 extending along the first direction Z. A part of the groove 4 is provided on the first sub-connecting portion 3121, and another part is provided on the second sub-connecting portion 3122. The second sub-connecting portion 3122 is bent relative to the first sub-connecting portion 3121 at the groove 4. That is, the groove 4 facilitates the relative bending of the first sub-connecting portion 3121 and the second sub-connecting portion 3122. Since the second sub-connecting portion 3122 is connected to the mounting portion 32 and the first sub-connecting portion 3121 is connected to the main body portion 311, the mounting portion 32 can be bent to the state shown in Figures 3 and 4. Since the groove 4 is located at the connection position of the first sub-connecting portion 3121 and the second sub-connecting portion 3122 in this embodiment, the two opposite groove walls of the groove 4 will not abut against each other when the mounting portion 32 is bent, so there will be no interference with the mounting portion 32. The sides of the mounting portion 32 and the main body portion 311 that are close to each other after bending are parallel to each other.

[0035] In the technical solution of this application, a groove 4 is provided on the connecting part 312. A part of the groove 4 is located on the first sub-connecting part 3121, which is flat, and another part is located on the second sub-connecting part 3122, which is arc-shaped. That is, the groove 4 is not completely located on the second sub-connecting part 3122, which is arc-shaped. Therefore, when the mounting part 32 is bent, the two opposite groove walls of the groove 4 will not abut against each other. That is, the groove in this embodiment can not only reduce the bending gap of the mounting part 32, but also avoid interference with the bending of the mounting part 32. In addition, the groove 4 is not located on the mounting part 32, so it will not occupy the welding area between the mounting part 32 and the electrode, providing more space for the welding of the pin on the mounting part 32 and increasing the effective welding area between the electrode and the pin structure.

[0036] Referring to Figures 5 and 6, in some embodiments of this application, the width of the groove 4 on the first sub-connector 3121 in the second direction Y is D1, and the thickness of the main body 311 in the third direction X is H1; wherein, D1 and H1 satisfy: 0.5H1≤D1≤1.5H1. In this embodiment, designing the values ​​of D1 and H1 to satisfy the range of 0.5H1≤D1≤1.5H1 can improve the bending effect of the mounting part 32, making the fitting effect between the mounting part 32 and the main body 311 better after bending. If the value of D1 is less than 0.5H1, the space of the groove 4 in the second direction Y will be insufficient, which will easily interfere with the bending of the mounting part 32 and affect the bending effect of the mounting part 32; if the value of D1 is greater than 1.5H1, the vertical distance from the second sub-connector 3122 to the main body 311 in the second direction Y will be too large, thereby increasing the material cost and weight of the pin structure.

[0037] In some embodiments of this application, since at least a portion of the groove 4 is located on the first sub-connecting portion 3121, the vertical distance from the connection point of the first sub-connecting portion 3121 and the second sub-connecting portion 3122 to the main body portion 311 in the second direction Y is L; wherein L and D1 satisfy: D1≤L. This arrangement ensures that the groove 4 is located on the first sub-connecting portion 3121 and does not extend into the main body portion 311 in the second direction Y.

[0038] In some embodiments of this application, the thickness of the pin structure is equal in the portion without the groove 4, that is, the thickness of the pin structure is H1.

[0039] Please refer to Figure 7. In some embodiments of this application, the connecting portion 312 includes a first surface 5 and a second surface 6 disposed opposite to each other, and the groove 4 is recessed from the first surface 5 toward the second surface 6.

[0040] The vertical distance from the lowest point of the groove 4 to the second surface 6 is H2; where H2 and H1 satisfy: 7 / 20H1≤H2≤3 / 5H1. In this embodiment, designing H1 and H2 to satisfy 7 / 20H1≤H2≤3 / 5H1 can improve the bending effect of the mounting part 32, making the fitting effect between the mounting part 32 and the main body 311 better after bending. If H2 is less than 7 / 20H1, the thickness of the connecting part 312 at the location where the groove 4 is provided is too small, so the flow capacity of the connecting part 312 at the location of the groove 4 is weak. If H2 is greater than 3 / 5H1, the thickness of the connecting part 312 at the location where the groove 4 is provided is too large, that is, the groove depth of the groove 4 is too small, which affects the bending of the mounting part 32.

[0041] In one embodiment, the lowest point of the groove 4 may be located on the first sub-connecting portion 3121; in another embodiment, the lowest point of the groove 4 may be located on the second sub-connecting portion 3122.

[0042] Please refer to Figures 7 and 8. In some embodiments of this application, the first surface 5 includes a first sub-surface 51, which is arc-shaped and disposed on the second sub-connecting portion 3122; that is, the first sub-surface 51 is the curved portion of the second sub-connecting portion 3122.

[0043] Wherein, the width of the portion of the groove 4 located on the second sub-connecting portion 3122 in the second direction Y is D2, and the radius of the circle containing the first sub-surface 51 is R; wherein, D2 and R satisfy: R≤D2≤ R. In this embodiment, R and D2 are designed to satisfy... R≤D2≤ The range of R can improve the bending effect of the mounting part 32, making the fitting effect between the mounting part 32 and the main body 311 better after bending; if D2 is less than If R is too large, the space of the groove 4 in the second direction Y will be insufficient, which will easily interfere with the bending of the mounting part 32 and affect the bending effect of the mounting part 32; if D2 is greater than R, then the portion of the second sub-connection portion 3122 with groove 4 is too large, resulting in an increase in the thinning area on the second sub-connection portion 3122, which leads to an increase in temperature on the second sub-connection portion 3122 during overflow.

[0044] In some embodiments of this application, R and H1 also satisfy: 1 / 2H1≤R≤H1. In this embodiment, designing R and H1 to satisfy 1 / 2H1≤R≤H1 can improve the bending effect of the mounting part 32, making the mounting part 32 fit better with the main body part 311 after bending; if R is greater than H1, it will increase the material cost of the second sub-connecting part 3122; if R is less than 1 / 2H1, it will be detrimental to the bending of the mounting part 32.

[0045] In some embodiments of this application, at least a portion of the groove wall of the groove 4 is curved to avoid forming sharp parts on the groove 4, thus preventing stress concentration at the groove 4 in the connecting part 312 when the pin structure is bent. Additionally, if sharp parts exist in the groove 4, they can easily interfere with the bending of the mounting part 32. In one embodiment of this application, the cross-section of the groove 4 is similar to a trapezoidal design. Furthermore, all groove walls of the groove 4 are smoothly transitioned.

[0046] In some embodiments of this application, a fusible groove 7 is provided on the electrode connection portion 1; the fusible groove 7 penetrates the electrode connection portion 1 in the first direction Z; wherein, the design of the fusible groove 7 reduces the cross-sectional area of ​​the electrode connection portion 1 located on both sides of the fusible groove 7 in the second direction Y, and when the current increases sharply, the temperature of the electrode connection portion 1 on both sides of the fusible groove 7 rises instantaneously, causing the metal to melt, thereby playing a safety protection role.

[0047] In some embodiments of this application, the pole connection part 1 is provided with a pole fixing hole 8; the pole fixing hole 8 penetrates the pole connection part 1 in the first direction Z, and the pole 2 located on the top cover 9 is welded and fixed in the pole fixing hole 8.

[0048] Please refer to Figure 9. This application also proposes a cover plate assembly, which includes a top cover 9 and a pin structure. The top cover 9 is provided with a pole post 2. The pin structure is as described above. The pole post connecting part 1 in the pin structure is connected to the pole post 2. Since this cover plate assembly adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0049] Since there are two poles 2 on the cover plate assembly, namely a positive pole and a negative pole, there are two pin structures, one of which is connected to the positive pole and the other is connected to the negative pole.

[0050] In some embodiments of this application, the pin structure in the cover plate assembly has a groove 4 on the connecting part 312. Part of the groove 4 is located on the first sub-connecting part 3121, which is flat, and another part is located on the second sub-connecting part 3122, which is arc-shaped. That is, the groove 4 is not completely located on the second sub-connecting part 3122, which avoids interference with the bending of the mounting part 32 when it is bent. In addition, the groove 4 is not located on the mounting part 32, so it does not occupy the welding area between the mounting part 32 and the tab, providing more space for the pin to be welded on the mounting part 32 and increasing the effective welding area between the tab and the pin structure.

[0051] This application also proposes a battery, which includes a core pack and a cover plate body. The core pack includes a core pack body and electrode tabs extending from the core pack body. The cover plate assembly is as described above, and the mounting portion 32 in the cover plate assembly is connected to the electrode tabs. Since this battery adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

Claims

1. A pin structure, comprising: A pole connection part (1) is configured to connect to a pole (2); and The electrode connecting part (3) includes a connecting plate (31) and a mounting part (32). The connecting plate (31) includes a main body part (311) and a connecting part (312). The main body part (311) extends along a first direction. One end of the main body part (311) in the first direction is connected to the electrode connecting part (1). The mounting part (32) is configured to connect to the electrode. The connecting plate (31) includes a first sub-connecting part (3121) and a second sub-connecting part (3122) that are connected to each other. The first sub-connecting part (3121) is flat and connected to the main body part (311) on one side in the second direction. The second sub-connecting part (3122) is arc-shaped and connected to the mounting part (32). The first direction and the second direction intersect. The connecting part (312) is provided with a groove (4) extending along the first direction. A part of the groove (4) is provided on the first sub-connecting part (3121) and another part is provided on the second sub-connecting part (3122). The second sub-connecting part (3122) is bent relative to the first sub-connecting part (3121) at the groove (4).

2. The pin structure according to claim 1, wherein, The width of the groove (4) located on the first sub-connecting part (3121) in the second direction is D1, and the thickness of the main body part (311) in the third direction is H1. The first direction and the second direction are perpendicular to the third direction, respectively. Wherein, D1 and H1 satisfy: 0.5H1≤D1≤1.5H1.

3. The pin structure according to claim 2, wherein, The vertical distance from the connection point of the first sub-connecting part (3121) and the second sub-connecting part (3122) to the main body part (311) in the second direction is L; Wherein, L and D1 satisfy: D1≤L.

4. The pin structure according to claim 2, wherein, The connecting portion (312) includes a first surface (5) and a second surface (6) disposed opposite to each other, and the groove (4) is recessed from the first surface (5) toward the second surface (6); The vertical distance from the lowest point of the groove (4) to the second surface (6) is H2; wherein H2 and H1 satisfy: 7 / 20H1≤H2≤3 / 5H1.

5. The pin structure according to claim 4, wherein, The first surface (5) includes a first sub-surface (51), which is arc-shaped and disposed on the second sub-connecting portion (3122); The width of the groove (4) located on the second sub-connecting part (3122) in the second direction is D2, and the radius of the circle containing the first sub-surface (51) is R; Wherein, D2 and R satisfy: R≤D2≤ R。 6. The pin structure according to claim 5, wherein, The R and H1 also satisfy: 1 / 2H1≤R≤H1.

7. The pin structure according to any one of claims 1 to 6, wherein, At least a portion of the groove wall of the groove (4) is curved.

8. The pin structure according to any one of claims 1 to 6, wherein, A fusible groove (7) extending along the first direction is provided through the pole connection part (1); and / or, The pole connection part (1) is provided with a pole fixing hole (8) extending in the first direction.

9. A cover plate assembly, comprising: Top cover (9), on which the pole post (2) is provided; and The pin structure includes the pin structure as described in any one of claims 1 to 8, wherein the pole connection portion (1) is connected to the pole (2).

10. A battery, comprising: The core package includes a core package body and the tabs extending from the core package body; and A cover plate assembly, including the cover plate assembly as claimed in claim 9; The electrode tab is connected to the mounting part (32).

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