Cover plate structure and battery

Abstract

The utility model relates to battery technology field discloses a cover plate structure and battery. Among them, the cover plate structure includes pole, top cover piece, upper plastic part, lower plastic part and adapter piece. The pole includes the pole main part and the clamping plate of one body setting, and the clamping plate sets up in the outer periphery of pole main part, and the projection of clamping plate at least partly falls on top cover piece in the first direction, and clamping plate is on the upper plastic part;Pole main part passes through upper plastic part, top cover piece and lower plastic part in proper order and is connected on adapter piece, realizes the pole fixed on top cover piece. The cover plate structure can improve the support force to pole in its axial direction to guarantee the connecting strength of pole, guarantees the safety of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate structure and a battery. Background Technology

[0002] The battery cover is an important component of the battery. The terminals on the cover connect the positive and negative terminals of the battery cell inside the casing to the electrical device on the outside of the casing, thus supplying power to the device. In existing technology, the end of the terminal facing inwards from the battery has an integral terminal plate to secure the bottom of the terminal inside the battery. The terminal plate and the cell tab are electrically connected via an adapter. The top of the terminal is secured by an upper plastic component. However, this design makes the terminal prone to collapse under longitudinal stress, potentially causing battery safety issues.

[0003] Therefore, there is an urgent need for a cover plate structure and a battery to solve the above problems. Utility Model Content

[0004] One objective of this invention is to provide a cover plate structure that can improve the axial support force on the terminal post, thereby ensuring the connection strength of the terminal post and ensuring battery safety.

[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0006] A cover plate structure is provided, including an electrode post, a top cover plate, an upper plastic part, a lower plastic part, and an adapter plate. The electrode post includes an integrally formed electrode post body and a retaining plate. The retaining plate is disposed on the outer periphery of the electrode post body. At least a portion of the projection of the retaining plate in a first direction falls on the top cover plate, and the retaining plate rests on the upper plastic part. The electrode post body passes sequentially through the upper plastic part, the top cover plate, and the lower plastic part and is connected to the adapter plate.

[0007] Optionally, the electrode post further includes a snap-fit ​​protrusion, which protrudes from the outer periphery of the electrode post body. The upper plastic part covers the snap-fit ​​protrusion, and the snap-fit ​​protrusion snaps onto the upper plastic part in the circumferential direction of the electrode post.

[0008] Optionally, a limiting protrusion is provided on the side of the top cover away from the adapter piece, the upper plastic part covers the limiting protrusion, and the limiting protrusion is engaged with the upper plastic part along the circumference of the pole post.

[0009] Optionally, an annular groove is provided at the top of the electrode post, and the upper plastic part covering the top edge of the electrode post is located within the annular groove.

[0010] Optionally, the top cover sheet has a first recess on the side facing the lower plastic part, and the first recess has a mounting hole; the lower plastic part has a protrusion on the side facing the top cover sheet, the protrusion is inserted into the first recess, and the protrusion has a through hole corresponding to the mounting hole, the mounting hole and the through hole are used for the pole post to pass through.

[0011] Optionally, the lower plastic part has a second recess on the side facing the adapter piece, and the adapter piece has a positioning protrusion on the side facing the lower plastic part, the positioning protrusion being inserted into the second recess.

[0012] Optionally, the positioning protrusion is an annular protrusion, and the pole is inserted into the inner ring of the annular protrusion and conforms to the inner ring.

[0013] Optionally, a processing groove is provided on the side of the adapter piece away from the lower plastic part, and the depth of the processing groove is less than the thickness of the adapter piece.

[0014] Optionally, the electrode post includes a positive electrode post and a negative electrode post, and the adapter plate includes a positive adapter plate and a negative adapter plate; the positive electrode post passes through the top cover plate and the lower plastic part and is connected to the positive adapter plate, and the negative electrode post passes through the top cover plate and the lower plastic part and is connected to the negative adapter plate.

[0015] Another objective of this invention is to provide a battery that can improve the axial support force on the terminals to ensure the connection strength of the terminals and the safety of the battery.

[0016] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0017] A battery is provided, including a battery cell, a housing, and the aforementioned cover structure, wherein the battery cell is located inside the housing, and the cover structure is sealed at the opening of the housing and electrically connected to the battery cell.

[0018] The beneficial effects of this utility model are as follows:

[0019] The cover plate structure proposed in this utility model includes an electrode post, a top cover plate, an upper plastic part, a lower plastic part, and a connecting plate. The electrode post includes an integrally formed electrode post body and a retaining plate. The retaining plate is disposed on the outer periphery of the electrode post body, and at least part of the projection of the retaining plate in a first direction falls on the top cover plate, and the retaining plate rests on the upper plastic part. The electrode post body passes through the upper plastic part, the top cover plate, and the lower plastic part in sequence and connects to the connecting plate. The retaining plate is located above the top cover plate, and there is a gap between the retaining plate and the top cover plate in the axial direction of the electrode post. The upper plastic part can be formed on the outer periphery of the electrode post and at the gap by injection molding. One end of the upper plastic part extends to the gap and abuts against the top cover plate, and the other end extends to the top of the electrode post (i.e., the retaining plate of the electrode post) and covers the top edge of the electrode post (i.e., the edge of the retaining plate). By supporting the retaining plate of the electrode post with the upper plastic part and covering the top edge of the electrode post, the electrode post is supported and fixed. The clamping plate of the terminal post rests at least partially on the top cover plate in the first direction, so that the top cover plate can provide support for the clamping plate of the terminal post through the upper plastic part in the axial direction of the terminal post. The clamping plate of the terminal post is integrally set with the main body of the terminal post, that is, the connection strength between the clamping plate and the main body of the terminal post is good. Compared with the prior art, which welds the terminal post to other clamping structures after passing through the top cover plate from bottom to top, it has a stronger connection strength. This can effectively prevent the top middle position of the terminal post from collapsing downward and causing the terminal post to break, effectively ensuring the assembly effect of the cover plate structure and ensuring the safe use of the battery.

[0020] The battery proposed in this utility model includes a battery cell, a casing, and the aforementioned cover structure. The battery cell is located inside the casing, and the cover structure is sealed at the opening of the casing and electrically connected to the battery cell. The cover structure of this battery can improve the axial support force on the terminals, thereby ensuring the connection strength of the terminals and ensuring battery safety. Attached Figure Description

[0021] Figure 1 This is a partially exploded structural diagram of the cover plate structure provided in an embodiment of this utility model.

[0022] Figure 2 This is a schematic diagram of the battery structure provided in an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of the battery provided in an embodiment of this utility model;

[0024] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0025] In the picture:

[0026] 1. Terminal post; 11. Terminal post body; 12. Clamping plate; 13. Clamping protrusion;

[0027] 2. Top cover plate; 21. Mounting hole; 22. Limiting protrusion;

[0028] 3. Install plastic parts;

[0029] 4. Lower plastic part; 41. Protrusion; 42. Second recess; 43. Through hole;

[0030] 5. Sealing ring;

[0031] 6. Adapter plate; 61. Positioning protrusion; 62. Machining groove;

[0032] 100, cover plate structure; 200, outer casing; 300, battery cell. Detailed Implementation

[0033] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0034] In the description of this utility model, unless otherwise explicitly 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 utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly 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 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 second 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.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, this embodiment provides a cover plate structure 100, including a pole post 1, a top cover plate 2, an upper plastic part 3, a lower plastic part 4, and an adapter plate 6. The pole post 1 includes an integrally formed pole post body 11 and a retaining plate 12. The retaining plate 12 is disposed on the outer periphery of the pole post body 11, and at least a portion of the projection of the retaining plate 12 in a first direction falls on the top cover plate 2, and the retaining plate 12 rests on the upper plastic part 3. The pole post body 11 passes sequentially through the upper plastic part 3, the top cover plate 2, and the lower plastic part 4 and connects to the adapter plate 6. In this embodiment, the first direction is... Figure 4 In the direction ab, the first direction is parallel to the axis of pole post 1.

[0039] Specifically, the top cover plate 2, the lower plastic part 4, and the adapter plate 6 are stacked. The top cover plate 2 has a mounting hole 21, and the lower plastic part 4 has a through hole 43. The bottom end of the pole body 11 passes through the mounting hole 21 and the through hole 43 from one side of the top cover plate 2 and abuts against the adapter plate 6. The retaining plate 12 is located above the top cover plate 2, and there is a gap between the retaining plate 12 and the top cover plate 2 in the axial direction of the pole 1. An upper plastic part 3 can be formed on the outer periphery of the pole 1 and at this gap by injection molding. One end of the upper plastic part 3 extends to the gap and abuts against the top cover plate 2, and the other end extends to the top of the pole 1 (i.e., the retaining plate 12 of the pole 1) and covers the top edge of the pole 1 (i.e., the edge of the retaining plate 12). By supporting the retaining plate 12 of the pole 1 with the upper plastic part 3 and covering the top edge of the pole 1, the pole 1 is supported and fixed.

[0040] In this embodiment, the clamping plate 12 of the terminal post 1 is at least partially projected onto the top cover plate 2 in the first direction, so that the top cover plate 2 can provide support for the clamping plate 12 of the terminal post 1 through the upper plastic part 3 in the axial direction of the terminal post 1. The clamping plate 12 of the terminal post 1 is integrally set with the terminal post body 11, that is, the connection strength between the clamping plate 12 and the terminal post body 11 is good. Compared with the prior art, where the terminal post 1 passes through the top cover plate 2 from bottom to top and is then welded to other clamping structures, it has a stronger connection strength. This can effectively prevent the top middle position of the terminal post 1 from collapsing downward and causing the terminal post 1 to break, effectively ensuring the assembly effect of the cover plate structure 100 and ensuring the safe use of the battery.

[0041] Specifically, the cover plate structure also includes a sealing ring 5, which is sleeved on the outer periphery of the pole post 1. The sealing ring 5 is axially sandwiched between the top cover plate 2 and the adapter plate 6 of the pole post 1, thereby ensuring the assembly sealing between the pole post 1, the top cover plate 2, the lower plastic part 4 and the adapter plate 6.

[0042] Optionally, such as Figure 1 As shown, the pole post 1 also includes a snap-fit ​​protrusion 13, which protrudes from the outer periphery of the pole post body 11. The snap-fit ​​protrusion 13 is a non-annular structure. When the upper plastic part 3 is injection molded to form the outer periphery of the pole post 1, the upper plastic part 3 will wrap around the snap-fit ​​protrusion 13. The non-annular snap-fit ​​protrusion 13 snaps onto the upper plastic part 3 in the circumferential direction of the pole post 1, limiting the upper plastic part 3 from rotating relative to the pole post 1, thereby ensuring the connection stability between the pole post 1 and the upper plastic part 3. In addition, the sealing ring 5 is sleeved on the outer periphery of the pole post 1 and is sandwiched between the snap-fit ​​protrusion 13 and the adapter piece 6 in the axial direction of the pole post 1. That is, the side of the sealing ring 5 away from the adapter piece 6 is simultaneously pressed by the top cover piece 2 and the snap-fit ​​protrusion 13. In this embodiment, the snap-fit ​​protrusion 13 includes at least one snap-fit ​​strip, which is an arc-shaped strip extending along the circumferential direction of the pole post 1. When multiple snap-fit ​​strips are provided, the multiple snap-fit ​​strips are spaced apart. In other embodiments, the snap-fit ​​protrusion may also be of other shapes, and there is no specific limitation.

[0043] Optionally, such as Figure 1 As shown, a limiting protrusion 22 is provided on the side of the top cover plate 2 away from the adapter plate 6. The limiting protrusion 22 is a non-annular structure. When the upper plastic part 3 is injection molded in the gap between the pole post 1 and the top cover plate 2, the upper plastic part 3 will include the limiting protrusion 22. The non-annular limiting protrusion 22 is engaged with the upper plastic part 3 circumferentially along the pole post 1. The limiting protrusion 22 restricts the upper plastic part 3 from rotating relative to the top cover plate 2, thereby ensuring the connection stability between the top cover plate 2 and the upper plastic part 3. In this embodiment, the limiting protrusion 22 includes at least one limiting protrusion. The limiting protrusion is a hemispherical structure provided on the top cover plate 2. When multiple limiting protrusions are provided, the multiple limiting protrusions are spaced apart. In other embodiments, the limiting protrusions may also be other shapes, and there is no specific limitation.

[0044] Optionally, a snap-fit ​​protrusion 13 is provided on the pole post 1, and a limiting protrusion 22 is provided on the top cover plate 2. After the plastic part 3 is provided, the relative positions of the pole post 1 and the top cover plate 2 can be fixed.

[0045] Optionally, an annular groove is provided at the top of the electrode post 1, and the upper plastic part 3 covering the top edge of the electrode post 1 is located in the annular groove. The annular groove facilitates the positioning of the injection molding position of the upper plastic part 3, and when the upper plastic part 3 covers the top of the electrode post 1, the top surface of the upper plastic part 3 is flush with the top of the electrode post 1.

[0046] Furthermore, referring to Figure 1 and Figure 4 To facilitate the positioning and installation of the top cover 2 and the lower plastic part 4, the top cover 2 has a first recess on the side facing the lower plastic part 4, and the mounting hole 21 is provided in the first recess. The lower plastic part 4 has a protrusion 41 on the side facing the top cover 2, and the through hole 43 is provided in the protrusion 41. By inserting the protrusion 41 into the first recess, the relative position of the lower plastic part 4 and the top cover 2 can be easily defined, ensuring that the mounting hole 21 and the through hole 43 are coaxial.

[0047] Furthermore, referring to Figure 1 and Figure 4 To facilitate the positioning and installation of the lower plastic part 4 and the adapter piece 6, the lower plastic part 4 has a second recess 42 on the side facing the adapter piece 6, and the adapter piece 6 has a positioning protrusion 61 on the side facing the lower plastic part 4. By inserting the positioning protrusion 61 into the second recess 42, the relative positions of the lower plastic part 4 and the adapter piece 6 can be easily limited. In this embodiment, the second recess 42 of the lower plastic part 4 protrudes towards the top cover piece 2 to form the aforementioned protrusion 41. The through hole 43 simultaneously passes through the second recess 42 and the protrusion 41, and the projection of the second recess 42 on the axial direction of the pole post 1 is located on the protrusion 41.

[0048] Optionally, such as Figure 1 As shown, the positioning protrusion 61 is an annular protrusion. The pole post 1 passes through the mounting hole 21 and the through hole 43 and is inserted into the inner ring of the annular protrusion, conforming to the shape of the annular protrusion. The positioning protrusion 61 not only facilitates the positioning of the mounting position of the adapter piece 6 and the lower plastic part 4, but also facilitates the positioning of the connection position between the pole post 1 and the adapter piece 6.

[0049] In other embodiments, the positioning protrusion 61 may also include multiple arc-shaped protrusions spaced circumferentially along the pole post 1, and the fitting inner circle formed by the multiple arc-shaped protrusions can also achieve positioning of the pole post 1.

[0050] Optionally, a processing groove 62 is provided on the side of the adapter piece 6 facing away from the lower plastic part 4, and the depth of the processing groove 62 is less than the thickness of the adapter piece 6. The processing groove 62 is used to reduce the thickness of the adapter piece 6 at the welding position with the electrode post 1, thereby improving the laser absorption rate and ensuring the welding effect between the electrode post 1 and the adapter piece 6. The processing groove 62 includes multiple small grooves, which are arranged in an array to form a processing groove 62 with multiple rows and columns of small grooves.

[0051] In this embodiment, the electrode post 1 of the cover plate structure 100 includes a positive electrode post and a negative electrode post, and the adapter plate 6 includes a positive electrode adapter plate and a negative electrode adapter plate. The positive electrode post passes through the top cover plate 2 and the lower plastic part 4 and is connected to the positive electrode adapter plate, and the negative electrode post passes through the top cover plate 2 and the lower plastic part 4 and is connected to the negative electrode adapter plate.

[0052] Specifically, the top cover 2 has a positive electrode mounting hole and a negative electrode mounting hole, and the lower plastic part 4 has a positive electrode through hole and a negative electrode through hole. The positive electrode post 1 passes through the positive electrode mounting hole and the positive electrode through hole and connects to the positive electrode adapter piece, and the negative electrode post 1 passes through the negative electrode mounting hole and the negative electrode through hole and connects to the negative electrode adapter piece. That is, the specific structure and assembly method of the positive and negative electrode posts of the cover plate structure 100 are the same.

[0053] like Figure 2 and Figure 3 As shown, this embodiment also provides a battery, including a battery cell 300, a casing 200, and the aforementioned cover structure 100. The battery cell 300 is located inside the casing 200, and the cover structure 100 is sealed at the opening of the casing 200 and electrically connected to the battery cell 300. The cover structure 100 of this battery can improve the axial support force on the terminal post 1 to ensure the connection strength of the terminal post 1 and ensure battery safety.

[0054] In this embodiment, since the terminal post 1 of the battery cover structure 100 no longer needs to be configured with a terminal post plate, but the bottom end of the terminal post 1 is directly connected to the adapter piece 6, the axial height of the terminal post 1 can be effectively reduced. In specific implementation, the axial height of the terminal post 1 can be reduced from more than 4mm to 2.6mm, saving the space occupied by the bottom end of the terminal post 1 in the outer casing 200, and improving the overall energy density of the battery.

[0055] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cover plate structure, characterized in that, The device includes an electrode post (1), a top cover plate (2), an upper plastic part (3), a lower plastic part (4), and an adapter plate (6). The electrode post (1) includes an integrally formed electrode post body (11) and a retaining plate (12). The retaining plate (12) is disposed on the outer periphery of the electrode post body (11). At least part of the projection of the retaining plate (12) in a first direction falls on the top cover plate (2), and the retaining plate (12) rests on the upper plastic part (3). The electrode post body (11) passes through the upper plastic part (3), the top cover plate (2), and the lower plastic part (4) in sequence and is connected to the adapter plate (6).

2. The cover plate structure according to claim 1, characterized in that, The pole post (1) also includes a snap-fit ​​protrusion (13), which protrudes from the outer periphery of the pole post body (11). The upper plastic part (3) wraps around the snap-fit ​​protrusion (13), and the snap-fit ​​protrusion (13) snaps onto the upper plastic part (3) in the circumferential direction of the pole post (1).

3. The cover plate structure according to claim 1, characterized in that, The top cover (2) has a limiting protrusion (22) on the side opposite to the adapter (6), the upper plastic part (3) covers the limiting protrusion (22), and the limiting protrusion (22) is engaged with the upper plastic part (3) along the circumference of the pole (1).

4. The cover plate structure according to claim 1, characterized in that, The top of the pole post (1) is provided with an annular groove, and the upper plastic part (3) covering the top edge of the pole post (1) is located in the annular groove.

5. The cover plate structure according to claim 1, characterized in that, The top cover (2) has a first recess on the side facing the lower plastic part (4), and a mounting hole (21) is provided on the first recess; the lower plastic part (4) has a protrusion (41) on the side facing the top cover (2), the protrusion (41) is inserted into the first recess, and a through hole (43) corresponding to the mounting hole (21) is provided on the protrusion (41), the mounting hole (21) and the through hole (43) are used for the pole post (1) to pass through.

6. The cover plate structure according to claim 1, characterized in that, The lower plastic part (4) has a second recess (42) on the side facing the adapter piece (6), and the adapter piece (6) is provided with a positioning protrusion (61) on the side facing the lower plastic part (4), and the positioning protrusion (61) is inserted into the second recess (42).

7. The cover plate structure according to claim 6, characterized in that, The positioning protrusion (61) is an annular protrusion, and the pole post (1) is inserted into the inner ring of the annular protrusion and conforms to the inner ring.

8. The cover plate structure according to claim 1, characterized in that, The adapter piece (6) has a processing groove (62) on the side opposite to the lower plastic part (4), and the depth of the processing groove (62) is less than the thickness of the adapter piece (6).

9. The cover plate structure according to any one of claims 1 to 8, characterized in that, The electrode post (1) includes a positive electrode post and a negative electrode post, and the adapter plate (6) includes a positive electrode adapter plate and a negative electrode adapter plate; the positive electrode post passes through the top cover plate (2) and the lower plastic part (4) and is connected to the positive electrode adapter plate, and the negative electrode post passes through the top cover plate (2) and the lower plastic part (4) and is connected to the negative electrode adapter plate.

10. A battery, characterized in that, The device includes a battery cell (300), a housing (200), and a cover structure (100) as described in any one of claims 1 to 9, wherein the battery cell (300) is located inside the housing (200), and the cover structure (100) is sealed at the opening of the housing (200) and electrically connected to the battery cell (300).

Images