Lower plastic plate, top cover and cylindrical battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a lower plastic plate, a top cover and a cylindrical battery. The lower plastic plate comprises a first plastic split body and a second plastic split body, the first plastic split body is connected to the second plastic split body, at least one of the first plastic split body and the second plastic split body is provided with a limiting part, and the limiting part extends in the radial direction so as to reduce the relative distance between the first plastic split body and the second plastic split body in the radial direction. By arranging the limiting part, the radial relative distance between the first plastic split body and the second plastic split body can be reduced, and the movement range between the first plastic split body and the second plastic split body is limited, so that the concentricity of the first plastic split body and the second plastic split body is effectively improved, and the use requirements of customers are met; and the consistency, the production quality and the use safety of the formed cylindrical battery can be enhanced. And meanwhile, the production quality of the top cover, the yield of the cylindrical battery and the use safety and stability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lower plastic plate, a top cover and a cylindrical battery. Background Technique

[0002] The existing common top cover of a cylindrical battery is composed of a pole column, an upper plastic plate, a light aluminum sheet, a lower plastic plate, etc. Among them, the lower plastic plate mainly plays the roles of insulating the light aluminum sheet and fixing the winding core. The lower plastic part is welded to the pole column as part of the top cover assembly. In order to ensure the welding performance of the lower plastic part and reduce the use cost of the lower plastic part, the lower plastic plate is now often designed into a split structure connected together. Among them, a part connected to the pole column by welding is manufactured by using materials with high temperature resistance such as PFA or PPS, and the other part is often manufactured by using materials with low cost such as PP to meet the design requirements.

[0003] However, at present, when the top cover of the cylindrical battery is riveted into a finished product, these two parts of the lower plastic plate will shift, resulting in poor concentricity and unable to meet the use requirements of customers. In severe cases, it may even cause the pole column to be short-circuited to the light aluminum sheet, resulting in a decrease in the use safety of the entire cylindrical battery.

[0004] Based on the above, there is an urgent need for a lower plastic plate, a top cover and a cylindrical battery to solve the problems existing in the prior art. Content of the Utility Model

[0005] An object of the utility model is to provide a lower plastic plate, which is used to solve the technical problem that the two-part split structure of the existing lower plastic plate shifts, resulting in poor concentricity and unable to meet the use requirements.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A lower plastic plate is applied to a cylindrical battery. The lower plastic plate includes: a first plastic split body and a second plastic split body. The first plastic split body is connected to the second plastic split body. At least one of the first plastic split body and the second plastic split body is provided with a limiting portion. The limiting portion extends radially to reduce the relative distance between the first plastic split body and the second plastic split body in the radial direction.

[0008] Preferably, the horizontal cross-sectional shape of the limiting portion includes at least one of a square, a trapezoid and a triangle.

[0009] Preferably, the limiting portion includes a limiting convex block and a limiting groove. The outer edge of the first plastic split body extends radially outward to form the limiting convex block, and the outer edge of the second plastic split body is radially inwardly recessed to form the limiting groove. The limiting convex block is inserted into the limiting groove.

[0010] Preferably, the radial dimension of the limiting bump is R1, where 21.35 mm ≤ R1 ≤ 21.45 mm; the radial dimension of the limiting groove is R2, where 21.55 mm ≤ R2 ≤ 21.65 mm.

[0011] Preferably, along the circumferential direction of the first plastic body, a plurality of the limiting bumps are uniformly arranged on the outer edge of the first plastic body;

[0012] Along the circumferential direction of the second plastic body, a plurality of the limiting grooves are uniformly arranged on the outer edge of the second plastic body, and the limiting bumps are inserted into the limiting grooves in a one-to-one correspondence.

[0013] Preferably, three of the limiting bumps are uniformly arranged on the outer edge of the first plastic body, and three of the limiting grooves are uniformly arranged on the outer edge of the second plastic body.

[0014] Preferably, along the axial direction of the cylindrical battery, the first plastic body includes a first stepped portion and a second stepped portion, and the cross-sectional area of the first stepped portion is smaller than that of the second stepped portion;

[0015] Along the axial direction of the cylindrical battery, the second plastic body includes a third stepped portion and a fourth stepped portion, the cross-sectional area of the third stepped portion is larger than that of the fourth stepped portion, the second stepped portion overlaps with the third stepped portion, and an adhesive layer is provided between the second stepped portion and the third stepped portion.

[0016] Preferably, the adhesive layer is laid on the second stepped portion; and / or the adhesive layer is laid on the third stepped portion.

[0017] Another object of the present invention is to provide a top cover, which can improve the assembly accuracy of its lower plastic plate, so as to ensure the production quality of the top cover.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] The top cover includes an aluminum sheet, a pole column, and the above-mentioned lower plastic plate. The lower plastic plate is fixed on the lower end surface of the aluminum sheet, and the pole column is arranged through the lower plastic plate and the aluminum sheet.

[0020] Another object of the present invention is to provide a cylindrical battery, by providing the above-mentioned top cover on the cylindrical battery, the yield and the use safety and stability of the cylindrical battery can be improved.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] The cylindrical battery includes the above-mentioned top cover.

[0023] Beneficial effects:

[0024] This embodiment provides a lower plastic plate, which includes a first plastic part and a second plastic part. At least one of the first plastic part and the second plastic part is provided with a limiting part, and the limiting part extends along the radial direction to reduce the relative distance between the first plastic part and the second plastic part along the radial direction. By setting the limiting part, the movement range between the first plastic part and the second plastic part is restricted, thereby effectively improving the concentricity of the first plastic part and the second plastic part and meeting the customer's usage requirements. In addition, by setting the above-mentioned lower plastic plate on the top cover, the assembly accuracy of the lower plastic plate can be improved, ensuring the production quality of the top cover, and further enhancing the consistency, production quality and use safety of the formed cylindrical battery. Description of the drawings

[0025] Figure 1 is a schematic structural diagram of the lower plastic plate provided by the present utility model;

[0026] Figure 2 is an exploded view of the structure of the lower plastic plate provided by the present utility model;

[0027] Figure 3 A top view of the first plastic part provided by the present utility model;

[0028] Figure 4 A top view of the second plastic part provided by the present utility model;

[0029] Figure 5 is a top view of the lower plastic plate provided by the present utility model;

[0030] Figure 6 is along Figure 5 the cross-sectional view taken along A-A in

[0031] Figure 7 is a schematic structural diagram of the top cover provided by the present utility model;

[0032] Figure 8 is a top view of the top cover provided by the present utility model;

[0033] Figure 9 is along Figure 8 the cross-sectional view taken along B-B in

[0034] Figure 10 is a schematic structural diagram of the cylindrical battery provided by the present utility model.

[0035] In the figure:

[0036] 10. Top cover; 101. Terminal post; 1011. Column body; 1012. Riveting part; 1013. Limiting part; 102. Light aluminum sheet; 20. Outer shell;

[0037] 1. First plastic split body; 11. First stepped part; 12. Second stepped part;

[0038] 2. Second plastic split body; 21. Third stepped part; 22. Fourth stepped part;

[0039] 3. Limiting part; 31. Limiting bump; 32. Limiting groove. Detailed implementation manners

[0040] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0041] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right", and "above and on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below and to the left", and "below and on" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature has a lower horizontal height than the second feature.

[0043] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "right", and "left" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for differentiation in description and have no special meaning.

[0044] Example 1

[0045] Reference Figures 1 to 6 As shown, this embodiment provides a lower plastic plate, which is applied to a cylindrical battery and includes a first plastic part 1 and a second plastic part 2. Among them, the first plastic part 1 is connected to the second plastic part 2, and at least one of the first plastic part 1 and the second plastic part 2 is provided with a limiting part 3, and the limiting part 3 extends radially to reduce the relative distance between the first plastic part 1 and the second plastic part 2 in the radial direction.

[0046] By setting the limiting part 3, the radial relative distance between the first plastic part 1 and the second plastic part 2 can be reduced, the movement range between the first plastic part 1 and the second plastic part 2 is limited, thereby effectively improving the concentricity of the first plastic part 1 and the second plastic part 2, meeting the customer's use requirements, and enhancing the consistency, production quality and use safety of the formed cylindrical battery.

[0047] Specifically, in this embodiment, with reference to Figure 2 As shown, the limiting part 3 includes a limiting protrusion 31 and a limiting groove 32. The outer edge of the first plastic part 1 extends radially outward to form a limiting protrusion 31, and the outer edge of the second plastic part 2 is recessed radially inward to form a limiting groove 32, and the limiting protrusion 31 is inserted into the limiting groove 32. Through the setting of the limiting protrusion 31 and the limiting groove 32, not only the requirement of restricting the movement range of the first plastic part 1 and the second plastic part 2 in the radial direction is met, but also the situation where the first plastic part 1 and the second plastic part 2 rotate relative to each other in the circumferential direction can be avoided, reducing the deviation of the finished product size and shape caused by the relative rotation of the two, so that the cooperation between the first plastic part 1 and the second plastic part 2 is more precise, ensuring the finished product quality of the finally formed lower plastic plate.

[0048] Optionally, along the circumferential direction of the first plastic part 1, a plurality of limiting protrusions 31 are uniformly arranged on the outer edge of the first plastic part 1; along the circumferential direction of the second plastic part 2, a plurality of limiting grooves 32 are uniformly arranged on the outer edge of the second plastic part 2, and the limiting protrusions 31 are inserted into the limiting grooves 32 one by one. By setting a plurality of limiting protrusions 31 and a plurality of limiting grooves 32, the possibility of relative rotation between the first plastic part 1 and the second plastic part 2 is further eliminated, thereby greatly improving the relative position stability of the two.

[0049] Preferably, in this embodiment, three limiting bumps 31 are evenly arranged on the outer edge of the first plastic split body 1, and three limiting grooves 32 are evenly arranged on the outer edge of the second plastic split body 2, which greatly enhances the installation accuracy of the positions of the first plastic split body 1 and the second plastic split body 2 on the basis of controlling the manufacturing cost. Of course, in other embodiments, those skilled in the art can also evenly arrange two, four, five or more limiting bumps 31 along the circumferential direction on the outer edge of the first plastic split body 1 according to actual needs. Correspondingly, the corresponding number of limiting grooves 32 are evenly arranged along the circumferential direction on the outer edge of the second plastic split body 2.

[0050] More specifically, in this embodiment, in combination with Figure 3 , Figure 4 as shown, the radial dimension of the limiting bump 31 is set as R1, and the radial dimension of the limiting groove 32 is set as R2. Among them, 21.35 mm ≤ R1 ≤ 21.45 mm, 21.55 mm ≤ R2 ≤ 21.65 mm. Exemplarily, R1 can be 21.35 mm, 21.36 mm, 21.37 mm, 21.38 mm, 21.39 mm, 21.40 mm, 21.41 mm, 21.42 mm, 21.43 mm, 21.44 mm or 21.45 mm, etc.; R2 can be 21.55 mm, 21.56 mm, 21.57 mm, 21.58 mm, 21.59 mm, 21.60 mm, 21.61 mm, 21.62 mm, 21.63 mm, 21.64 mm or 21.65 mm. That is to say, there is an assembly gap between the limiting bump 31 and the limiting groove 32, and the size of this assembly gap is determined by the actual radial dimensions of the limiting bump 31 and the limiting groove 32. The present invention does not limit this, as long as it can ensure that the limiting bump 31 is assembled and inserted into the limiting groove 32, and at the same time, the concentricity tolerance between the limiting bump 31 and the limiting groove 32 can meet the actual requirements.

[0051] More specifically, in this embodiment, the horizontal cross-sectional shapes of the limiting bump 31 and the limiting groove 32 are the same and are both square shapes. Of course, in other parallel embodiments, the horizontal cross-sectional shapes of the limiting bump 31 and the limiting groove 32 can also be triangular or trapezoidal, but the square cross-section is easier to machine and manufacture, has a lower cost, and is also easier to align and assemble the limiting bump 31 and the limiting groove 32 to reduce errors.

[0052] It can be understood that in other embodiments, the lower plastic plate may further include limiting portions 3 with at least two cross-sectional shapes. For example, when the number of limiting portions 3 is two, the cross-sectional shape of one of the limiting portions 3 (i.e., the cross-sectional shape of the limiting bump 31 and the limiting groove 32) may be one of a square, a trapezoid, and a triangle, and the cross-sectional shape of the other limiting portion 3 may be another one of a square, a trapezoid, and a triangle. So that the limiting bump 31 can be correspondingly inserted into the limiting groove 32 with a corresponding cross-sectional shape, which can further improve the assembly accuracy and assembly efficiency of the first plastic part 1 and the second plastic part 2.

[0053] Specifically, in this embodiment, referring to Figure 5 As shown, along the axial direction of the cylindrical battery, the first plastic part 1 includes a first stepped portion 11 and a second stepped portion 12. The cross-sectional area of the first stepped portion 11 is smaller than that of the second stepped portion 12, and the outer edge of the first stepped portion 11 protrudes outward with the above-mentioned limiting bump 31. In addition, along the axial direction of the cylindrical battery, the second plastic part 2 includes a third stepped portion 21 and a fourth stepped portion 22. The cross-sectional area of the third stepped portion 21 is larger than that of the fourth stepped portion 22, and the outer edge of the third stepped portion 21 is recessed inward with the above-mentioned limiting groove 32, and the second stepped portion 12 overlaps the third stepped portion 21. The connection between the first plastic part 1 and the second plastic part 2 is realized by overlapping, which can make the assembly process of the two more convenient.

[0054] Combined with Figures 7 to 9 As shown, another object of this embodiment is to provide a top cover 10, which can improve the assembly accuracy of its lower plastic plate, thereby avoiding the situation that the pole 101 is short-circuited to the light aluminum sheet 102 due to the offset of the installation position of the lower plastic plate, resulting in a decrease in the production quality of the top cover 10. The top cover 10 includes a pole 101, a light aluminum sheet 102, and the above-provided lower plastic plate. The lower plastic plate is fixed on the lower end surface of the light aluminum sheet 102, and the pole 101 is arranged through the lower plastic plate and the light aluminum sheet 102.

[0055] Specifically, referring to Figure 9As shown, the terminal post 101 includes a column body 1011, a riveting portion 1012, and a limiting portion 3. The column body 1011 passes through the lower plastic plate and the light aluminum sheet 102, and one end of the column body 1011 passing through the lower plastic plate and the light aluminum sheet 102 is connected to the riveting portion 1012 and fixed on the light aluminum sheet 102 through the riveting portion 1012. The other opposite end of the column body 1011 is connected to the limiting portion 3. The limiting portion 3 is convexly provided outward along the circumferential side wall of the column body 1011, and the upper surface of the limiting portion 3 is in abutting contact with the first plastic part 1. The first plastic part 1 is insulated and arranged between the terminal post 101 and the light aluminum sheet 102. In this way, the first plastic part 1 and the second plastic part 2 can be sequentially pressed and fixed on the light aluminum sheet 102 through the limiting portion 3, thereby realizing the fixation of the lower plastic plate.

[0056] Another object of this embodiment is to provide a cylindrical battery. Refer to Figure 10 As shown, the cylindrical battery includes a housing, an electric core, and the above-mentioned top cover 10. The housing contains the electric core, and the top cover 10 is hermetically covered on the opening of the housing. The tab in the electric core is electrically connected to the terminal post 101 in the top cover 10 to achieve the purpose of supplying power outward from the cylindrical battery. By providing the above-mentioned top cover 10 on the cylindrical battery, the yield rate and the use safety and stability of the cylindrical battery can be improved.

[0057] Embodiment Two

[0058] This embodiment provides a lower plastic plate. The structure of the lower plastic plate provided in this embodiment is substantially the same as the structure of the lower plastic plate provided in the embodiment. The differences are as follows:

[0059] In this embodiment, an adhesive layer is further provided between the second stepped portion 12 and the third stepped portion 21 to fix the first plastic part 1 and the second plastic part 2 and prevent the two from moving relative to each other in the radial direction and the circumferential direction, so as to meet the requirement that the first plastic part 1 and the second plastic part 2 always maintain the same concentricity during actual use.

[0060] Exemplarily, in this embodiment, an adhesive layer is laid on the second stepped portion 12, so that when the first plastic part 1 overlaps on the second plastic part 2, the two can be fixedly connected through the adhesive layer. Optionally, the adhesive layer can be formed by curing an adhesive such as hot melt adhesive or silicone rubber. The present invention does not limit this. Of course, in other embodiments, in order to further improve the bonding firmness between the first plastic part 1 and the second plastic part 2, the above-mentioned adhesive layer can also be laid on both the second stepped portion 12 and the third stepped portion 21, and those skilled in the art can choose according to actual needs.

[0061] In the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0062] Obviously, the above embodiments of the present utility model are merely examples given for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. The lower plastic plate is applied to cylindrical batteries and is characterized in that, The lower plastic plate includes: a first plastic part (1) and a second plastic part (2), the first plastic part (1) is connected to the second plastic part (2), and at least one of the first plastic part (1) and the second plastic part (2) is provided with a limiting part (3), the limiting part (3) extends radially to reduce the relative distance between the first plastic part (1) and the second plastic part (2) in the radial direction.

2. The lower plastic plate according to claim 1, characterized in that, The horizontal cross-sectional shape of the limiting part (3) includes at least one of a square, a trapezoid, and a triangle.

3. The lower plastic plate according to claim 1, characterized in that, The limiting part (3) includes a limiting protrusion (31) and a limiting groove (32), the outer edge of the first plastic part (1) extends radially outward to form the limiting protrusion (31), the outer edge of the second plastic part (2) is radially inwardly recessed to form the limiting groove (32), and the limiting protrusion (31) is inserted into the limiting groove (32).

4. The lower plastic plate according to claim 3, wherein, The radial dimension of the limiting protrusion (31) is R1, 21.35mm ≤ R1 ≤ 21.45mm; the radial dimension of the limiting groove (32) is R2, 21.55mm ≤ R2 ≤ 21.65mm.

5. The lower plastic plate according to claim 3, characterized in that, Along the circumferential direction of the first plastic part (1), a plurality of the limiting protrusions (31) are uniformly arranged on the outer edge of the first plastic part (1); Along the circumferential direction of the second plastic part (2), a plurality of the limiting grooves (32) are uniformly arranged on the outer edge of the second plastic part (2), and the limiting protrusions (31) are inserted into the limiting grooves (32) in one-to-one correspondence.

6. The lower plastic plate according to claim 5, wherein Three of the limiting protrusions (31) are uniformly arranged on the outer edge of the first plastic part (1), and three of the limiting grooves (32) are uniformly arranged on the outer edge of the second plastic part (2).

7. The lower plastic plate according to claim 1, characterized in that, Along the axial direction of the cylindrical battery, the first plastic part (1) includes a first stepped part (11) and a second stepped part (12), and the cross-sectional area of the first stepped part (11) is smaller than the cross-sectional area of the second stepped part (12); Along the axial direction of the cylindrical battery, the second plastic part (2) includes a third stepped part (21) and a fourth stepped part (22), the cross-sectional area of the third stepped part (21) is larger than the cross-sectional area of the fourth stepped part (22), the second stepped part (12) overlaps the third stepped part (21), and an adhesive layer is provided between the second stepped part (12) and the third stepped part (21).

8. The lower plastic plate according to claim 7, characterized in that, The adhesive layer is laid on the second stepped part (12); and / or the adhesive layer is laid on the third stepped part (21).

9. Top cover, characterized in that, It includes a light aluminum sheet (102), a terminal post (101), and the lower plastic plate according to any one of claims 1-8, the lower plastic plate is fixed on the lower end surface of the light aluminum sheet (102), and the terminal post (101) is arranged through the lower plastic plate and the light aluminum sheet (102).

10. Cylindrical battery, characterized in that, It includes a top cover (10) according to claim 9.

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