Lower plastic part, battery cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a lower plastic part, a battery cover plate assembly and a battery, the lower plastic part comprises a plastic part body and a first supporting table, and the first supporting table is connected to the end part of the plastic part body in the length direction. A first groove is formed in the first supporting table, a traction part is arranged on the groove wall of the first groove, and when the lower plastic part is demolded, pulling force deviating from the direction of the first supporting table can be applied to the end, in the length direction, of the lower plastic part through the arrangement of the traction part; the end of the lower plastic part in the length direction forms reverse deformation in the direction deviating from the first supporting table during demolding, the reverse deformation counteracts bending deformation generated after demolding and cooling of the lower plastic part, and therefore the flatness of the cooled finished lower plastic part is good, the lower plastic part can be completely attached to a top cover when assembled with the top cover, and the service life of the lower plastic part is prolonged. Edge warping is avoided, and the product yield is high. The utility model provides a battery cover plate assembly and a battery. The battery cover plate assembly comprises the lower plastic part.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lower plastic part, a battery cover assembly and a battery. Background Art

[0002] As the primary power source for new energy vehicles, power batteries are facing increasingly stringent performance requirements, particularly regarding their energy density per unit volume. The battery cover assembly is a key parameter affecting its energy density per unit volume.

[0003] In existing technology, the energy density per unit volume of power batteries is often increased by reducing the thickness of the battery cover assembly. In such battery cover assemblies, the lower plastic component, located between the top cover and the terminal, is large in length and width but thin. This results in the lower plastic component being prone to warping and deformation at both ends of its length, away from the top cover, after demolding and cooling during injection molding, resulting in low product yield. Utility Model Content

[0004] The purpose of the utility model is to provide a lower plastic part, a battery cover assembly and a battery, wherein the lower plastic part has good flatness, is not prone to warping after being assembled with the top cover, and has a high yield rate.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a lower plastic part, the lower plastic part comprising:

[0007] The plastic body is arranged on one side of the top cover;

[0008] The first support platform is connected to the plastic body and is arranged at the end of the plastic body in the length direction. The first support platform is provided with a first groove on the side facing the top cover, and a pulling part is provided on the groove wall of the first groove.

[0009] Optionally, the pulling portion is a strip-shaped boss, and the strip-shaped boss extends along the height direction of the first supporting platform.

[0010] Optionally, there are a plurality of strip-shaped bosses, and at least one strip-shaped boss is provided on each groove wall of the first groove.

[0011] Optionally, the plastic part body includes a first section and a second section, and the first support platform is provided at ends of the first section and the second section that are away from each other.

[0012] Optionally, a second support platform is provided on the first subsection and / or the second subsection, and the second support platform is arranged at the ends of the first subsection and the second subsection that are close to each other.

[0013] Optionally, along the width direction of the plastic body, a plurality of first grooves are provided on the first support platform, and the plurality of first grooves are arranged at intervals;

[0014] Along the width direction of the plastic body, a plurality of second grooves are provided on the second support platform, and the plurality of second grooves are arranged at intervals.

[0015] Optionally, the pulling portion is a plurality of circular protrusions, and the plurality of circular protrusions are distributed at intervals on the groove wall of the first groove.

[0016] In a second aspect, the present invention provides a battery cover assembly, comprising a top cover and a lower plastic component in any of the above solutions, wherein the lower plastic component is arranged on one side of the top cover.

[0017] Optionally, the battery cover assembly further includes an upper plastic part, a connecting block and a pole, wherein the upper plastic part is arranged on a side of the top cover away from the lower plastic part, and the pole passes through the lower plastic part, the top cover and the upper plastic part and is connected to the connecting block.

[0018] In a third aspect, the utility model provides a battery comprising a shell, a pole group, and a battery cover assembly according to any of the above schemes, wherein an opening is provided on one side of the shell, the pole group is inserted into the shell through the opening, and the battery cover assembly is connected to the opening of the shell.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a lower plastic part, comprising a plastic part body and a first support platform, wherein the first support platform is connected to the plastic part body and is arranged at an end portion in the length direction of the plastic part body. A first groove is provided on the side of the first support platform facing the top cover, and a pulling portion is provided on the groove wall of the first groove. When the lower plastic part is demolded, the pulling portion can apply a pulling force in a direction away from the first support platform to the end portion in the length direction of the lower plastic part, so that the end portion in the length direction of the lower plastic part forms a reverse deformation in a direction away from the first support platform when demolded, and the reverse deformation is offset by the bending deformation generated by the lower plastic part after demolding and cooling. As a result, the finished lower plastic part after cooling has good flatness, and the lower plastic part can be completely fitted to the top cover when assembled with the top cover, and the end portion in the length direction of the lower plastic part will not be tilted away from the top cover, thereby achieving a high product yield.

[0021] The utility model provides a battery cover assembly, comprising a top cover and the aforementioned lower plastic component, wherein the lower plastic component is disposed on one side of the top cover. By adopting the lower plastic component, the top cover can be well supported, and the lower plastic component and the top cover are tightly fitted, which is not prone to warping and has a high product yield.

[0022] The utility model also provides a battery comprising a housing, a pole group, and the aforementioned battery cover assembly. The housing has an opening on one side, through which the pole group is inserted into the housing, and the battery cover assembly is connected to the opening of the housing. By employing the aforementioned battery cover assembly, the lower plastic component can be well-fitted to the top cover, making it less susceptible to warping. The overall flatness of the battery cover assembly is excellent, and the lower plastic component provides good support for the top cover and pole group, ensuring good insulation between the two and providing improved safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the lower plastic part provided in an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 3 is a top view of the lower plastic part provided in an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 It is an exploded view of the battery cover assembly provided in an embodiment of the present utility model.

[0028] In the picture:

[0029] 100, lower plastic part; 110, plastic part body; 111, first subdivision; 112, second subdivision; 120, first support platform; 121, first groove; 1211, strip boss; 130, second support platform; 131, second groove; 140, first mounting hole; 150, pressure relief hole; 160, first liquid injection hole; 200, top cover; 210, second mounting hole; 220, fifth mounting hole; 230, second liquid injection hole; 300, upper plastic part; 310, third mounting hole; 400, connecting block; 410, fourth mounting hole; 500, pole; 510, plate body; 520, column body; 600, sealing part; 700, explosion-proof valve; 710, protective sticker. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] In the existing battery cover assembly, one side of the lower plastic part is connected to the top cover, and the other side of the lower plastic part is provided with a support platform, which can support the electrode group so that the electrode group is well fixed in the shell and not easy to shake. In order to reduce the weight of the lower plastic part, a groove is usually provided on the support platform of the lower plastic part, and the groove is provided toward the side of the top cover. The lower plastic part is usually formed by injection molding. After the lower plastic part is formed in the injection mold, if it is demolded before it is completely cooled, it is easy to cause the lower plastic part to bend, twist, and other deformations toward the side where the support platform is located. When the lower plastic part is assembled with the top cover, the two ends of the lower plastic part in the length direction are tilted toward the side away from the top cover, resulting in a low product yield.

[0035] This embodiment provides a lower plastic part. The injection mold used for the lower plastic part includes a front mold and a rear mold. The rear mold and the front mold, when engaged, together form a cavity for injection molding the lower plastic part. A liquid injection port is provided on the front mold or the rear mold, and the liquid injection port is connected to the above-mentioned cavity. Molten plastic can be injected into the cavity through the liquid injection port. After the plastic solidifies in the cavity, the molded lower plastic part can be removed from the injection mold. The lower plastic part has good flatness and is not prone to warping after being assembled with the top cover, resulting in a high yield rate.

[0036] Specifically, see Figures 1-4 In this embodiment, the lower plastic part 100 includes a plastic part body 110 and a first support platform 120. The plastic part body 110 is arranged on one side of the top cover 200. The first support platform 120 is connected to the plastic part body 110, and the first support platform 120 is arranged in the length direction of the plastic part body 110 ( Figure 1 The plastic body 110 can support the top cover 200 on one side of the lower plastic part 100, and the first support platform 120 can support the electrode assembly on the other side of the lower plastic part 100, thereby ensuring good positioning between the electrode assembly and the top cover 200 and preventing shaking.

[0037] Furthermore, a first groove 121 is provided on the side of the first support platform 120 facing the top cover 200. The first groove 121 can reduce the material used for the lower plastic part 100, reduce the cost and reduce the weight of the lower plastic part 100, which is conducive to improving the energy density of the battery. A pulling portion is provided on the groove wall of the first groove 121. When the lower plastic part 100 is demolded (that is, when the lower plastic part 100 is separated from the front mold), the setting of the pulling portion can increase the friction between the front mold and the lower plastic part 100, so that the front mold can apply a pulling force to the end of the length direction of the lower plastic part 100 away from the first support platform 120. The end of the length direction of the lower plastic part 100 forms a reverse deformation in the direction away from the first support platform 120 when demolding. The reverse deformation is offset by the bending deformation generated by the lower plastic part 100 after demolding and cooling. As a result, the finished lower plastic part 100 after cooling has good flatness and can be completely fitted to the top cover 200 when assembled with the top cover 200. The end of the length direction of the lower plastic part 100 will not warp away from the top cover 200, and the product yield is high. It should be noted that the length direction of the lower plastic part 100 here is Figure 1 and Figure 3 The X-axis direction shown in FIG is the direction away from the first support platform 120. Figure 1 and Figure 3 The Z-axis direction is shown in FIG.

[0038] As an optional solution, the pulling portion in this embodiment can be set as a strip-shaped boss 1211, and the strip-shaped boss 1211 extends along the height direction of the first support platform 120. The height direction of the first support platform 120 is Figure 1 and Figure 3 The Z-axis direction shown in FIG. The provision of the strip boss 1211 increases the contact area between the lower plastic part 100 and the front mold, thereby increasing the friction between the end portion of the lower plastic part 100 in the longitudinal direction and the front mold, thereby causing the lower plastic part 100 to form a reverse deformation amount during demolding. For example, the cross-section of the strip boss 1211 along the XY plane can be semicircular. On the one hand, this facilitates demolding of the lower plastic part 100; on the other hand, the larger circumference of the semicircle is conducive to increasing the contact area between the lower plastic part 100 and the front mold. The friction between the end portion of the lower plastic part 100 in the longitudinal direction and the front mold is greater, that is, the lower plastic part 100 is subjected to a greater pulling force during demolding.

[0039] Furthermore, along the width direction of the plastic body 110 (ie Figure 1 and Figure 3 In the Y-axis direction shown in FIG, the first support platform 120 of this embodiment is provided with a plurality of first grooves 121, which are arranged at intervals. A strip-shaped boss 1211 (i.e., a pulling portion) is provided in each first groove 121. This ensures that the force applied to the lower plastic part 100 along its width direction is uniform, resulting in a better appearance of the lower plastic part 100 and good flatness after demolding and cooling.

[0040] Optionally, there may be multiple strip-shaped bosses 1211 in each first groove 121, and the cross-section of the first groove 121 along the XY plane is square, that is, the first groove 121 has four groove walls, and at least one strip-shaped boss 1211 is provided on each groove wall of the first groove 121. By way of example, this embodiment is described by taking one strip-shaped boss 1211 on each groove wall as an example, and the strip-shaped boss 1211 is provided in the middle of the groove wall. Optionally, in other embodiments, two strip-shaped bosses 1211, three strip-shaped bosses 1211, etc. may be provided on each groove wall. Alternatively, in other embodiments, the strip-shaped bosses 1211 may be provided only on two opposite groove walls of the first groove 121, which are not listed here one by one.

[0041] Of course, in some embodiments, the pulling portion can also be configured as a plurality of circular protrusions, which are spaced apart on the groove wall of the first groove 121. The circular protrusions can also increase the contact area between the lower plastic part 100 and the front mold, thereby increasing the friction between the end portion of the lower plastic part 100 in the longitudinal direction and the front mold, thereby causing the lower plastic part 100 to form a reverse deformation amount during demolding. For example, the cross-section of the circular protrusion along the XY plane can be circular. On the one hand, it is convenient for the lower plastic part 100 to be demolded; on the other hand, the larger the circumference of the circle, the more conducive it is to increase the contact area between the lower plastic part 100 and the front mold. The friction between the end portion of the lower plastic part 100 in the longitudinal direction and the front mold is greater, that is, the lower plastic part 100 is subjected to a greater pulling force during demolding.

[0042] Continue to see Figure 1 and Figure 3 The plastic body 110 in this embodiment includes a first section 111 and a second section 112. The first section 111 and the second section 112 are arranged along the length direction of the lower plastic part 100 (i.e. Figure 1 and Figure 3 The first and second subsections 111, 112 are arranged sequentially along the X-axis direction shown in FIG. First support platforms 120 are provided at the ends of the first and second subsections 111, 112 facing away from each other, and a pulling portion is provided within the first groove 121 of each of the first support platforms 120. By segmenting the body 110 of the lower plastic part 100, the length of each component of the body 110 is shortened, which helps alleviate bending and deformation of the lower plastic part 100 during demolding and cooling. This ensures the flatness of the lower plastic part 100, ensuring a perfect fit with the top cover 200 and preventing warping.

[0043] Furthermore, a second support platform 130 is provided on the first subsection 111 and / or the second subsection 112. The second support platform 130 is disposed at the adjacent ends of the first subsection 111 and the second subsection 112. For example, this embodiment uses the second support platform 130 disposed on the first subsection 111 as an example. The second support platform 130 is located on the first subsection 111, near the end of the second subsection 112. Overall, the second support platform 130 is located in the middle of the length of the plastic body 110. The second support platform 130 also supports the electrode assembly and the top cover 200. This effectively supports the middle of the length of the electrode assembly and the middle of the length of the top cover 200, making the assembly structure more stable and the fit between the lower plastic part 100 and the top cover 200 tighter. Of course, in other embodiments, the second support platform 130 can also be disposed on the end of the second subsection 112, near the end of the first subsection 111. Alternatively, a second support platform 130 is provided at the end portions of the first sub-portion 111 and the second sub-portion 112 that are close to each other, which will not be described in detail here.

[0044] Optionally, the second support platform 130 is provided with a plurality of second grooves 131 spaced apart from each other along the width of the plastic body 110. The provision of the second grooves 131 can further reduce the material used in the lower plastic part 100, thereby lowering costs and reducing the weight of the lower plastic part 100, thereby improving the energy density of the battery.

[0045] See also Figure 5 This embodiment also provides a battery cover assembly, including a top cover 200 and the aforementioned lower plastic component 100, with the lower plastic component 100 disposed on one side of the top cover 200. The lower plastic component 100 of this embodiment provides good support for the top cover 200, and the tight fit between the lower plastic component 100 and the top cover 200 prevents edge warping, resulting in a high product yield.

[0046] Furthermore, the battery cover assembly in this embodiment also includes an upper plastic part 300, a connecting block 400, and a terminal 500. The upper plastic part 300 is disposed on the side of the top cover 200 facing away from the lower plastic part 100, the connecting block 400 is disposed on the side of the upper plastic part 300 facing away from the lower plastic part 100, and the terminal 500 passes through the lower plastic part 100, the top cover 200, and the upper plastic part 300 before being connected to the connecting block 400. Optionally, a seal 600 is further disposed between the terminal 500 and the top cover 200 to seal the gap between the terminal 500 and the top cover 200.

[0047] Exemplarily, the pole 500 includes a plate portion 510 and a column portion 520, the lower plastic part 100 is provided with a first mounting hole 140, the top cover 200 is provided with a second mounting hole 210, the upper plastic part 300 is provided with a third mounting hole 310, and the connecting block 400 is provided with a fourth mounting hole 410. The seal 600 is sleeved on the column portion 520 of the pole 500, and the column portion 520 passes through the first mounting hole 140, the second mounting hole 210, the third mounting hole 310 and the fourth mounting hole 410 in sequence and is riveted to the connecting block 400, thereby pressing the lower plastic part 100 against one side of the top cover 200 through the plate portion 510, and pressing the upper plastic part 300 against the other side of the top cover 200 through the connecting block 400.

[0048] Furthermore, the battery cover assembly includes an explosion-proof valve 700, and a fifth mounting hole 220 is provided on the top cover 200, and the explosion-proof valve 700 is arranged in the fifth mounting hole 220. The first subsection 111 and the second subsection 112 of the lower plastic part 100 are both provided with a pressure relief hole 150, and the pressure relief hole 150 is directly opposite the explosion-proof valve 700. When the pressure on one side of the top cover 200 exceeds the valve opening pressure of the explosion-proof valve 700, high-temperature and high-pressure gas and / or liquid will be ejected through the pressure relief hole 150 and the explosion-proof valve 700 to achieve pressure relief and ensure the safety of the battery. More preferably, a protective sticker 710 is further provided on the side of the top cover 200 facing away from the lower plastic part 100. The protective sticker 710 can cover the fifth mounting hole 220. The protective sticker 710 can protect the explosion-proof valve 700 and prevent the explosion-proof valve 700 from being bumped and causing its valve opening pressure to be unstable.

[0049] Optionally, a first liquid injection hole 160 is further defined in the second subsection 112 of the lower plastic member 100, and a second liquid injection hole 230 is defined in the top cover 200. The first liquid injection hole 160 communicates with the second liquid injection hole 230. After the battery cover assembly is assembled with the housing, electrolyte can be injected into the housing through the first liquid injection hole 160 and the second liquid injection hole 230.

[0050] This embodiment also provides a battery comprising a housing, an electrode group, and the aforementioned battery cover assembly. The housing has an opening on one side, through which the electrode group is inserted into the housing, and the battery cover assembly is connected to the opening of the housing. By employing the aforementioned battery cover assembly, the lower plastic part 100 can be well-fitted to the top cover 200, making it less susceptible to warping. The overall flatness of the battery cover assembly is excellent, and the lower plastic part 100 can provide good support for the top cover 200 and the electrode group, preventing the electrode group from shaking within the housing while ensuring good insulation between the two, resulting in better safety.

[0051] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A lower plastic part, characterized in that: The lower plastic part (100) comprises: The plastic body (110) is arranged on one side of the top cover (200); A first support platform (120) is connected to the plastic body (110), and the first support platform (120) is arranged at the end of the plastic body (110) in the length direction. A first groove (121) is provided on the side of the first support platform (120) facing the top cover (200), and a pulling portion is provided on the groove wall of the first groove (121).

2. The lower plastic part according to claim 1, characterized in that: The pulling portion is a strip-shaped boss (1211), and the strip-shaped boss (1211) extends along the height direction of the first supporting platform (120).

3. The lower plastic part according to claim 2, characterized in that: There are a plurality of strip-shaped bosses (1211), and at least one strip-shaped boss (1211) is provided on each groove wall of the first groove (121).

4. The lower plastic part according to claim 1, characterized in that: The plastic part body (110) comprises a first section (111) and a second section (112), and the first support platform (120) is provided at the ends of the first section (111) and the second section (112) that are away from each other.

5. The lower plastic part according to claim 4, characterized in that: A second support platform (130) is provided on the first subsection (111) and / or the second subsection (112), and the second support platform (130) is arranged at the ends of the first subsection (111) and the second subsection (112) that are close to each other.

6. The lower plastic part according to claim 5, characterized in that: Along the width direction of the plastic body (110), the first support platform (120) is provided with a plurality of first grooves (121), and the plurality of first grooves (121) are arranged at intervals; Along the width direction of the plastic body (110), a plurality of second grooves (131) are provided on the second support platform (130), and the plurality of second grooves (131) are arranged at intervals.

7. The lower plastic part according to claim 1, characterized in that: The pulling portion is a plurality of circular protrusions, and the plurality of circular protrusions are distributed at intervals on the groove wall of the first groove (121).

8. A battery cover assembly, characterized in that: The invention comprises a top cover (200), and a lower plastic part (100) according to any one of claims 1 to 7, wherein the lower plastic part (100) is arranged on one side of the top cover (200).

9. The battery cover assembly according to claim 8, characterized in that: The battery cover assembly further comprises an upper plastic part (300), a connecting block (400) and a pole (500). The upper plastic part (300) is arranged on a side of the top cover (200) away from the lower plastic part (100). The pole (500) passes through the lower plastic part (100), the top cover (200) and the upper plastic part (300) and is connected to the connecting block (400).

10. A battery, characterized in that: It comprises a shell, an electrode group, and the battery cover assembly according to claim 8 or 9, wherein one side of the shell is provided with an opening, the electrode group is inserted into the shell through the opening, and the battery cover assembly is connected to the opening of the shell.

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