A top cover structure and secondary battery

Abstract

The utility model provides a top cover structure and a secondary battery, including a top cover sheet, a pressing block, a plastic part, a first sealing ring and a pole, the top cover sheet includes a sink and a first mounting hole penetrating the bottom surface of the sink, the pressing block is arranged above the bottom surface of the sink and is annular, a receiving groove is provided between the lower surface of the pressing block and the bottom surface of the sink, the first sealing ring is arranged on the inner wall of the receiving groove and is pressed between the pressing block and the sink, the pole passes through the first mounting hole and the pressing block and has an upper section of the pole located above the bottom surface of the sink, the plastic part is partially filled in the sink and connected to the side wall of the upper section of the pole. The structure solves the instability problem existing in the welding method, enhances the sealing effect between the top cover sheet and the pole, and solves the problem of sealing failure caused by welding holes, cracks, etc.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of secondary batteries, in particular to a top cover structure and a secondary battery. Background Art

[0002] The top cover structure of a secondary battery is usually a sealed structure formed by fixing the pole passing through the top cover sheet with the top cover pole located above the top cover sheet, wherein the pole and the top cover pole are usually fixed and sealed by welding. However, the welding method is unstable and the welding quality is difficult to guarantee, resulting in low product yield. In addition, problems such as weld holes and cracks may occur, causing the sealing structure to fail to achieve a good sealing effect, and in severe cases, the sealing may fail. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a top cover structure and a secondary battery, which are used to solve the problems of low product yield and poor sealing effect caused by the welding method between the pole and the top cover pole.

[0004] In order to solve the above technical problems, in a first aspect, the utility model provides a top cover structure, comprising:

[0005] A top cover sheet, comprising a sink and a first mounting hole penetrating through the bottom surface of the sink;

[0006] A pressing block is arranged above the bottom surface of the sinking platform, a receiving groove is provided between the lower surface of the pressing block and the bottom surface of the sinking platform, and the pressing block is annular;

[0007] A first sealing ring, arranged inside the receiving groove, and pressed between the pressing block and the sinking platform;

[0008] A pole, the pole passes through the first mounting hole and the pressing block, and has an upper section of the pole located above the bottom surface of the sink;

[0009] A plastic part is partially filled in the sink and connected to the side wall of the upper section of the pole, and the plastic part covers the upper surface and side wall of the pressing block.

[0010] According to one embodiment of the utility model, the lower surface of the pressing block is partially recessed in a direction away from the bottom surface of the sinking platform to form the accommodating groove, or the bottom surface of the sinking platform is partially recessed in a direction away from the lower surface of the pressing block to form the accommodating groove.

[0011] According to an embodiment of the utility model, the plastic part is provided with a first clamping portion, an annular clamping groove is provided on the side wall of the upper section of the pole, and the first clamping portion is arranged inside the annular clamping groove.

[0012] According to an embodiment of the utility model, the plastic part is further provided with a second clamping portion, an undercut groove is provided between the inner surface of the sink and the outer side wall of the pressing block, and the second clamping portion is provided inside the undercut groove.

[0013] According to an embodiment of the utility model, a tab connecting piece is also included, and the pole column and the tab connecting piece are connected to form a transition piece.

[0014] According to an embodiment of the present invention, the plastic part further includes a second mounting hole, and the second mounting hole is connected to the first mounting hole so that the pole passes through.

[0015] According to an embodiment of the present invention, the pole has an upper step portion protruding from the second mounting hole, and the upper surface of the plastic part is not higher than the upper surface of the upper step portion.

[0016] According to an embodiment of the utility model, it further comprises a second sealing ring, which is sleeved on the pole and at least partially located between the hole wall of the first mounting hole and the side wall of the pole.

[0017] According to an embodiment of the present invention, a gap is provided between the side wall of the pressing block and the side wall of the upper section of the pole, and the plastic part is partially arranged inside the gap.

[0018] In a second aspect, the utility model further provides a secondary battery, comprising the top cover structure as described in the first aspect.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The utility model provides a top cover structure and a secondary battery, comprising a top cover sheet, a pressing block, a plastic part, a first sealing ring and a pole, wherein the top cover sheet comprises a sink and a first mounting hole penetrating the bottom surface of the sink, the pressing block is arranged above the bottom surface of the sink and the pressing block is annular, a receiving groove is provided between the lower surface of the pressing block and the bottom surface of the sink, and the first sealing ring is arranged on the inner wall of the receiving groove It is pressed between the pressing block and the sink, the pole passes through the first mounting hole and the pressing block and has an upper section of the pole located above the bottom surface of the sink, and the plastic part is partially filled in the sink and connected to the side wall of the upper section of the pole. In this way, the structure uses the plastic part to connect and fix the top cover sheet and the pole and form a sealing effect, which solves the instability problem of the welding method, thereby improving the product yield, and by setting a first sealing ring inside the receiving groove between the lower surface of the pressing block and the bottom surface of the sink, the first sealing ring can be fully deformed between the top cover sheet and the pole, thereby enhancing the sealing effect between the top cover sheet and the pole, and solving the problem of sealing failure caused by welding holes, cracks, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of a top cover structure provided by the utility model;

[0023] Figure 2 yes Figure 1 An exploded view of the top cover structure 100 is shown;

[0024] Figure 3 Is for Figure 2 a cutaway view of the exploded view shown;

[0025] Figure 4 Is for Figure 1 A top view of the top cover structure shown;

[0026] Figure 5 Is for Figure 1 A partial side view of the top cover structure shown;

[0027] Figure 6 It is a schematic diagram of a secondary battery provided by the utility model. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0029] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0033] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0034] Figure 1 It is a schematic diagram of a top cover structure 100 provided by the utility model. Figure 2 yes Figure 1 The exploded view of the top cover structure 100 is shown. The exploded view is along the height direction ( Figure 2 In the z direction shown in the figure, from top to bottom, they are: the plastic part 4, the pressing block 3, the first sealing ring 5, the top cover sheet 1, the second sealing ring 43 and the pole 22.

[0035] See also Figure 1 The top cover structure 100 includes a top cover sheet 1, a pole 22, a pressing block 3, a plastic part 4 and a first sealing ring 5. Figure 1 , Figure 2 From the perspective of the top cover 1, the top cover sheet 1 includes a sink 11 and a first mounting hole 12 that penetrates the bottom surface of the sink 11. The bottom surface of the sink 11 refers to its surface facing the opposite direction of the z direction. The pole 22 includes a pole upper section 221, wherein the pole upper section 221 is located above the bottom surface of the sink 11. The top cover structure 100 may also include a tab connecting sheet 21, wherein the tab connecting sheet 21 is connected to the pole 22 to form a transfer sheet 2, and the pole 22 is located above the tab connecting sheet 21.

[0036] The pole 22 may be a cylinder, and accordingly, the first mounting hole 12 may be a circular hole, but the present invention is not limited thereto. The shape and size of the pole 22 are compatible with the shape and size of the first mounting hole 12. Figure 1 The pole 22 passes through the first mounting hole 12 and is connected to the top cover sheet 1 through the first sealing ring 5, the plastic part 4, the pressing block 3 and the second sealing ring 9.

[0037] See also Figure 2 In order to make the top cover structure 100 integral, the pole 22 can pass through the first mounting hole 12, the first sealing ring 5, and the pressing block 3 in sequence, and then the plastic part 4 is arranged in the remaining space of the sink 11 not occupied by the first sealing ring 5, the pressing block 3 and the pole 22. Figure 1, the plastic part 4 is arranged between the sink 11 and the pole 22. Specifically, the plastic part 4 covers the upper surface and side wall of the pressing block 3, and the plastic part 4 is partially filled in the sink 11 and connected to the side wall of the upper section of the pole 22 to seal the sink 11 and the pole 22. The pressing block 3 is arranged above the bottom surface of the sink 11, the pressing block 3 is annular, and there is a receiving groove 6 between the lower surface of the pressing block 3 and the bottom surface of the sink 11, and the first sealing ring 5 is arranged inside the receiving groove 6. The first sealing ring 5 is pressed between the pressing block 3 and the sink 11, so that the first sealing ring 5 can be fully deformed under the gravity of the pressing block 3 and the support of the sink 11. Compared with the top cover structure 100 using welding, the product yield can be improved because the instability problem existing in the welding method is avoided. In addition, since the deformation of the first sealing ring 5 is sufficient, the sealing effect between the top cover sheet 1 and the pole 22 can be guaranteed, and the sealing failure caused by welding holes, cracks, etc. will not occur.

[0038] In one embodiment of the present invention, the first sealing ring 5 can be a rubber ring, so that the pressing block 3 presses the rubber ring to produce sufficient deformation between the accommodating groove 6, and cooperates with the sealing effect of the plastic part 4 on the top cover sheet 1 and the pole 22, so that the top cover structure 100 can have a good sealing effect.

[0039] In addition, in one embodiment of the present invention, the pressing block 3 may be an aluminum block or other materials. Also, the cross section of the pressing block 3 may be a trapezoid, a rectangle, etc., or the pressing block 3 itself may be an irregular object, which is not limited in the present application.

[0040] In one embodiment of the present invention, see Figure 1 The receiving groove 6 is formed by a partial depression of the lower surface of the pressing block 3 in a direction away from the bottom surface of the sinking platform 11; in other embodiments, the receiving groove 6 can also be formed by a partial depression of the bottom surface of the sinking platform 11 in a direction away from the lower surface of the pressing block 3 (not shown).

[0041] See also Figure 1 In one embodiment of the present invention, the plastic part 4 is partially filled in the sink 11 and connected to the side wall of the pole upper section 221, and the plastic part 4 covers the upper surface and side wall of the pressing block 3. The advantage of this is that the plastic part 4 can be formed by injecting glue above the top cover sheet 1, so that it is partially filled in the sink 11, thereby covering the upper surface and side wall of the pressing block 3, and can effectively connect the pole 22 and the top cover sheet.

[0042] See also Figure 3 , which is Figure 2 According to one embodiment of the utility model, combined with Figure 1 , Figure 3From the perspective of the embodiment, the plastic part 4 is provided with a first clamping portion 41, and an annular clamping groove 222 is provided on the side wall of the pole upper section 221, and the first clamping portion 41 is arranged inside the annular clamping groove 222. The first clamping portion 41 is equivalent to being protruded from the inner side of the plastic part 4, and its shape and size are adapted to the groove of the annular clamping groove 222. Figure 1 The advantage of this is that, since the first clamping portion 41 is arranged inside the annular clamping groove 222, the plastic part 4 and the pole 22 can be clamped, thereby preventing the plastic part 4 from falling off the pole 22 and increasing the connection strength between the plastic part 4 and the pole 22.

[0043] Combination Figure 1 , Figure 3 According to an embodiment of the present invention, the plastic part 4 is further provided with a second clamping portion 42, an undercut groove 7 is provided between the upper surface of the sink 11 and the outer wall of the pressing block 3, and the second clamping portion 42 is provided inside the undercut groove 7. The second clamping portion 42 is equivalent to being provided protruding downward at the bottom of the plastic part 4, and its shape and size are adapted to the undercut groove 7. Figure 1 The advantage of doing so is that, since the second clamping portion 42 is arranged inside the undercut groove 7, the plastic part 4 and the top cover sheet 1 can be clamped together, thereby preventing the plastic part 4 from falling off the top cover sheet 1 and increasing the connection strength between the plastic part 4 and the top cover sheet 1.

[0044] See also Figure 1 , the cross section of the undercut groove 7 may be a trapezoid. In other embodiments, the cross section of the undercut groove 7 may be, for example, an inverted T-shape, a triangle or a rectangle. The second clamping portion 42 has the same shape as the cross section of the undercut groove 7. The angle between the hypotenuse of the trapezoid and the top cover sheet 1 is less than 90°, and the undercut groove 7 is arranged between the top cover sheet 1 and the pressing block 3. The advantage of doing this is that the hypotenuse of the trapezoid forms an anti-undercut structure between the plastic part 4 and the top cover sheet 1, thereby preventing the plastic part 4 and the top cover sheet 1 from detaching, and further increasing the effect of the plastic part 4 on the connection, fixation and sealing of the pole 22 and the top cover sheet 1.

[0045] In addition, the first clamping portion 41 and the second clamping portion 42 are arranged along Figure 2 The heights in the z direction shown may be consistent or inconsistent, and the present application does not impose any limitation on this.

[0046] Combination Figure 1 , Figure 2 According to one embodiment of the present invention, an insulating member 8 is further included, wherein the insulating member 8 is disposed between the bottom surface of the top cover sheet 1 and the tab connecting sheet 21 , and is used to seal and fix the tab connecting sheet 21 below the top cover sheet 1 .

[0047] Combination Figure 1 and Figure 4According to an embodiment of the present invention, the plastic part 4 further includes a second mounting hole 43, and the second mounting hole 43 is connected to the first mounting hole 12 so that the pole 22 can pass through. Figure 5 The pole 22 has an upper step portion 223 protruding from the second mounting hole 43, and the upper surface of the plastic part 4 is not higher than the upper surface of the upper step portion 223, so that the upper surface of the upper step portion 223 is exposed so that the upper surface of the upper step portion 223 can be connected to an external device.

[0048] Combination Figure 1-Figure 3 From the perspective of one embodiment of the utility model, a second sealing ring 9 is further included. At least a portion of the second sealing ring 9 is located between the hole wall of the first mounting hole 12 and the side wall of the pole 22. Among them, the inner diameter of the second sealing ring 9 can be slightly larger than the outer diameter of the bottom of the pole 22 so that the second sealing ring 9 can be sleeved on the bottom of the pole 22. Similarly, the outer diameter of the second sealing ring 9 can be slightly smaller than the inner diameter of the first mounting hole 12 so that the second sealing ring 9 is sleeved under the pressing block 3. The advantage of doing this is that when the pole 22 passes through the first mounting hole 12, at least a portion of the second sealing ring 9 can be located between the first mounting hole 12 and the side wall of the pole 22 and be completely pressed together, which can further achieve a sealing effect and enhance the sealing performance of the top cover structure 100.

[0049] See also Figure 1 According to an embodiment of the present invention, there may be a gap 31 between the side wall of the pressing block 3 and the side wall of the pole upper section 221. In the case where the second sealing ring 9 is not provided, there may also be a gap 31 between the hole wall of the first mounting hole 12 and the side wall of the pole 22, and the plastic part 4 is partially provided inside the gap 31. The advantage of this is that the plastic part 4 can fill the space between the pole 22 and the top cover sheet 1, thereby achieving complete sealing, enhancing the sealing stability of the top cover structure 100, and increasing the connection area and improving the connection strength.

[0050] For further information, see Figure 6 The utility model also provides a secondary battery, including the top cover structure 100 as described above.

[0051] The secondary battery includes a battery cell 200 and a battery housing 300 for accommodating the battery cell 200. The surface of the battery cell 200 may be coated with an insulating material. An insulating gasket 400 is provided between the battery cell 200 and the adapter 2. A top cover sheet 1 is provided above the adapter 2. The adapter 2 includes a tab connector 21 and a pole 22. The tab connector 21 is connected to the tab of the battery cell 200. The adapter pole 22 is connected in the height direction (such as Figure 5After the plastic part 4 is sequentially passed through the first mounting hole 12 on the top cover sheet 1 (in the z direction shown), the plastic part 4 is filled between the sink 11 and the pole 22 to form the top cover structure 100. Finally, the battery cell 200 is accommodated in the battery housing 300, and the top cover structure 100 seals the opening of the battery housing 300 to form Figure 5 The secondary battery shown.

[0052] Since the top cover structure 100 forms a connection and fixation between the top cover sheet 1 and the pole 22 through the plastic part 4 and achieves a sealing effect, the instability problem existing in the welding method is solved, thereby improving the product yield rate, and by arranging the first sealing ring 5 inside the receiving groove 6 between the bottom surface of the pressing block 3 and the upper surface of the sink 11, the first sealing ring 5 can be fully deformed between the top cover sheet 1 and the pole 22, thereby enhancing the sealing effect between the top cover sheet 1 and the pole 22, and solving the problem of sealing failure caused by welding holes, cracks, etc. Therefore, the above-mentioned secondary battery has good sealing performance, high product yield rate and good product quality.

[0053] The basic concepts have been described above. Obviously, for those skilled in the art, the above utility model disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0054] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0055] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0056] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0057] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A top cover structure, characterized in that: include: A top cover sheet, comprising a sink and a first mounting hole penetrating through the bottom surface of the sink; A pressing block is arranged above the bottom surface of the sinking platform, a receiving groove is provided between the lower surface of the pressing block and the bottom surface of the sinking platform, and the pressing block is annular; A first sealing ring, arranged inside the receiving groove, and pressed between the pressing block and the sinking platform; A pole, the pole passes through the first mounting hole and the pressing block, and has an upper section of the pole located above the bottom surface of the sink; A plastic part is partially filled in the sink and connected to the side wall of the upper section of the pole, and the plastic part covers the upper surface and side wall of the pressing block.

2. The top cover structure according to claim 1, characterized in that: The lower surface of the pressing block is partially recessed in a direction away from the bottom surface of the sinking platform to form the accommodating groove, or the bottom surface of the sinking platform is partially recessed in a direction away from the lower surface of the pressing block to form the accommodating groove.

3. The top cover structure according to claim 2, characterized in that: The plastic part is provided with a first clamping portion, and an annular clamping groove is provided on the side wall of the upper section of the pole, and the first clamping portion is arranged inside the annular clamping groove.

4. The top cover structure according to claim 3, characterized in that: The plastic part is further provided with a second clamping portion, an undercut groove is provided between the inner surface of the sinking platform and the outer side wall of the pressing block, and the second clamping portion is provided inside the undercut groove.

5. The top cover structure according to claim 1, characterized in that: It also includes a pole tab connecting piece, and the pole column and the pole tab connecting piece are connected to form a transition piece.

6. The top cover structure according to claim 1, characterized in that: The plastic part further includes a second mounting hole, and the second mounting hole is connected to the first mounting hole to allow the pole to pass through.

7. The top cover structure according to claim 6, characterized in that: The pole has an upper step portion protruding from the second mounting hole, and the upper surface of the plastic part is not higher than the upper surface of the upper step portion.

8. The top cover structure according to claim 1, characterized in that: It also includes a second sealing ring, which is sleeved on the pole and at least partially located between the hole wall of the first mounting hole and the side wall of the pole.

9. The top cover structure according to claim 1, characterized in that: There is a gap between the side wall of the pressing block and the side wall of the upper section of the pole, and the plastic part is partially arranged inside the gap.

10. A secondary battery, characterized in that: The invention comprises a top cover structure as claimed in any one of claims 1 to 9.

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