Interference fit cover plate assembly and battery

Abstract

The utility model belongs to the technical field of power batteries, and discloses a cover plate assembly and a battery, and the cover plate assembly comprises a cover plate, a first plastic part, a second plastic part and a tab. The first plastic part is located at the top of the cover plate, the second plastic part is located at the bottom of the cover plate, the second plastic part is in a plate shape so as to fully reduce the size and improve the space utilization rate, a tab through hole is formed in the cover plate, a first through hole is formed in the first plastic part, a second through hole is formed in the second plastic part, and the first plastic part is in interference fit with the tab through hole; the first plastic part and the cover plate can be fixedly connected without other fasteners or fixing parts, the first plastic part is provided with the first through holes, the second plastic part is provided with the second through holes, the second through holes, the tab through holes and the first through holes are in one-to-one correspondence, the tabs can sequentially penetrate through the second through holes, the tab through holes and the first through holes, the production cost is low, and the production efficiency is high. The cover plate assembly is simple and durable in structure, convenient to assemble, high in universality and modular in design, and the number of the tabs can be determined according to actual requirements, so that the overall structure of the cover plate assembly is customized.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to an interference fit cover plate assembly and a battery. Background Art

[0002] The cover assembly of the power battery is a key component that plays the role of sealing, fixing and insulation. The cover assembly includes a tab, a plain aluminum plate, a first plastic part and a second plastic part. There are tab mounting holes for installing the tabs on the aluminum sheet and the second plastic part. The tabs are used to electrically connect the battery cell to external electrical devices. When the cover assembly is assembled as a whole, the tabs pass through the tab mounting holes of the second plastic part, the plain aluminum plate and the first plastic part in turn.

[0003] The first plastic part of the traditional cover is on the outside of the cover, and the second plastic part is thicker, resulting in it occupying too much space inside the shell, and the volume of the battery cell is reduced, thus affecting the overall capacity of the battery. Utility Model Content

[0004] The purpose of the utility model is to provide an interference fit cover plate assembly and a battery, which has high space utilization and is easy to assemble.

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

[0006] Interference fit cover plate assembly, comprising:

[0007] The cover plate is provided with a tab through hole;

[0008] A first plastic part is located on the top of the cover plate, the first plastic part is provided with a first through hole, and the first plastic part is interference-fitted with the tab through hole;

[0009] a second plastic part in a plate shape, the second plastic part being located at the bottom of the cover plate and having a second through hole;

[0010] The tab can pass through the second through hole, the tab through hole and the first through hole in sequence, and the second through hole, the tab through hole and the first through hole correspond to each other one by one.

[0011] Preferably, a connecting boss is provided at the bottom of the first plastic part, the connecting boss extends along the circumference of the first through hole, the connecting boss can extend into the tab through hole, and interference ribs are provided on the outer peripheral side of the connecting boss and / or the inner wall of the tab through hole.

[0012] Preferably, when the interference rib is provided on the outer peripheral side of the connecting boss, an inclined guide surface is provided at the bottom end of the interference rib;

[0013] When the interference rib is arranged on the inner wall of the tab through hole, the top surface of the interference rib is provided with an inclined guide surface.

[0014] Preferably, the guide surface is a curved surface or a flat surface.

[0015] Preferably, the cross-sectional projection of the interference rib in the vertical direction is at least one of U-shape, V-shape or wave-shape.

[0016] Preferably, the cross-sectional projection of the interference rib in the horizontal direction is at least one of a vertical strip, an inclined strip or a wave shape.

[0017] Preferably, the connecting boss is annular, and when the interference rib is provided on the outer peripheral side of the connecting boss, the interference rib is provided on at least two outer peripheral surfaces of the connecting boss, respectively.

[0018] Preferably, the tab through hole is rectangular, and when the interference rib is provided on the inner wall of the tab through hole, the interference rib is provided on at least two inner circumferential surfaces of the tab through hole.

[0019] Preferably, an explosion-proof valve is provided on the cover plate, and an exhaust hole is provided on the second plastic part, and the exhaust hole is located below the explosion-proof valve.

[0020] Batteries, including:

[0021] a housing having an opening;

[0022] A battery cell is disposed inside the housing;

[0023] The interference fit cover plate assembly seals the opening.

[0024] Beneficial effects of the utility model:

[0025] The cover plate is located between the first plastic part and the second plastic part. The second plastic part is plate-shaped to fully reduce the volume and improve space utilization. A tab through hole is provided on the cover plate. The first plastic part and the tab through hole are interference fit. No other fasteners or fixings are needed to achieve a fixed connection between the first plastic part and the cover plate. The first plastic part is provided with a first through hole, and the second plastic part is provided with a second through hole. The second through hole, the tab through hole and the first through hole correspond one to one. The tab can pass through the second through hole, the tab through hole and the first through hole in sequence. The production cost is low, the structure is simple and durable, it is easy to assemble, and it has strong versatility. The number of tabs can be determined according to actual needs, so as to customize the overall structure of the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural exploded view of one direction of the interference fit cover assembly of the utility model;

[0027] Figure 2This is an exploded view of the structure of the interference fit cover assembly of the utility model in another direction;

[0028] Figure 3 This is a schematic structural diagram of the first plastic part of the present invention;

[0029] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0030] Figure 5 This is a schematic structural diagram of one aspect of the interference fit cover assembly of the utility model;

[0031] Figure 6 It is a structural schematic diagram of another orientation of the interference fit cover plate assembly described in the present invention.

[0032] In the picture:

[0033] 1. Cover plate; 10. Tab through hole; 11. Explosion-proof valve; 12. Mounting slot; 121. Weight reduction slot; 13. Explosion-proof hole; 131. Mounting bracket; 132. Positioning step; 14. Liquid injection hole; 15. Diversion groove;

[0034] 2. First plastic part; 20. First through hole; 21. Connecting boss;

[0035] 3. Second plastic part; 30. Second through hole; 31. Exhaust hole; 32. Diversion hole;

[0036] 40. Interference rib; 41. Guide surface. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and 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 specific circumstances.

[0039] In the description of the present utility model, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0041] like Figures 1-6 As shown, the utility model provides an interference fit cover plate assembly for sealing the opening of a battery housing, the cover plate assembly comprising a cover plate 1, a first plastic part 2, a second plastic part 3 and a tab (not shown). The cover plate 1 is provided with a tab through hole 10; the first plastic part 2 is located at the top of the cover plate 1 and is provided with a first through hole 20, and the first plastic part 2 is interference fit with the tab through hole 10; the second plastic part 3 is plate-shaped and is located at the bottom of the cover plate 1 and is provided with a second through hole 30; the tab can pass through the second through hole 30, the tab through hole 10 and the first through hole 20 in sequence, and the second through hole 30, the tab through hole 10 and the first through hole 20 correspond to each other.

[0042] The cover plate 1 is located between the first plastic part 2 and the second plastic part 3. The second plastic part 3 is plate-shaped to fully reduce the volume and improve space utilization. A tab through hole 10 is provided on the cover plate 1. The first plastic part 2 and the tab through hole 10 are interference fit. No other fasteners or fixings are needed to achieve a fixed connection between the first plastic part 2 and the cover plate 1. The first plastic part 2 is provided with a first through hole 20, and the second plastic part 3 is provided with a second through hole 30. The second through hole 30, the tab through hole 10 and the first through hole 20 correspond one to one. The tab can pass through the second through hole 30, the tab through hole 10 and the first through hole 20 in sequence. The production cost is low, the structure is simple and durable, it is easy to assemble, and it has strong versatility. The number of tabs can be determined according to actual needs, thereby customizing the overall structure of the cover plate assembly.

[0043] It can be understood that the tabs include positive tabs and / or negative tabs, and the type of tabs can be determined according to actual design requirements. Each tab corresponds to at least one second through hole 30, at least one tab through hole 10 and at least one first through hole 20. Each tab passes through the second through hole 30, the tab through hole 10 and the first through hole 20 in sequence and is folded over to improve the space utilization inside the battery casing.

[0044] Specifically, the first plastic part 2 can be integral or split. In this embodiment, the first plastic part 2 is split, i.e., each tab corresponds to the first plastic part 2 one by one. In other embodiments, the first plastic part 2 can also be integral, i.e., multiple tabs correspond to one first plastic part 2.

[0045] Specifically, the second plastic part 3 can be integral or split. In this embodiment, the second plastic part 3 is integral, i.e., multiple tabs correspond to one second plastic part 3. In other embodiments, the second plastic part 3 can also be integral, i.e., the tabs correspond to the second plastic part 3 one by one.

[0046] In this embodiment, the cover plate assembly is provided with two tabs, and each tab is correspondingly provided with two tab through-holes 10, two first through-holes 20, and two second through-holes 30. In other embodiments, the number of tab through-holes 10, first through-holes 20, and two second through-holes 30 can be set according to actual design requirements, and is not specifically limited here.

[0047] Specifically, a connecting boss 21 is provided at the bottom of the first plastic part 2. The connecting boss 21 extends circumferentially along the first through-hole 20 and is capable of extending into the tab through-hole 10. Interference ribs 40 are provided on the outer circumference of the connecting boss 21 and / or the inner wall of the tab through-hole 10. This arrangement achieves an interference fit between the connecting boss 21 and the tab through-hole 10 via the interference ribs 40, simplifying production and processing, reducing mold costs, and facilitating assembly. In this embodiment, the interference ribs 40 are provided on the outer circumference of the connecting boss 21.

[0048] Preferably, in this embodiment, the cover plate 1 is rectangular, and each first plastic part 2 is provided with two connecting bosses 21 spaced apart along the width of the cover plate 1. Each connecting boss 21 is 1 mm to 10 mm away from the edge of the first plastic part 2. This arrangement facilitates installation of the first plastic part 2 on the cover plate 1 while also ensuring that the weight of the first plastic part 2 is not excessive, effectively controlling costs and saving raw materials.

[0049] Preferably, in this embodiment, the interference range of the interference rib 40 in the horizontal direction is adjusted to 0.05mm-0.30mm relative to the inner wall of the connecting boss 21 or the tab through hole 10. The above setting can ensure that there is sufficient contact area between the interference rib 40 and the inner wall of the connecting boss 21 or the tab through hole 10 to ensure the reliability of the connection. At the same time, the first plastic part 2 will not be unable to be assembled on the cover plate 1 due to excessive interference.

[0050] More specifically, a mounting groove 12 is formed on the cover plate 1, and the tab through-hole 10 is formed at the bottom of the mounting groove 12, so that the first plastic part 2 can be placed in the mounting groove 12. The provision of the mounting groove 12 improves the fit between the cover plate 1 and the first plastic part 2, reduces the volume of the first plastic part 2 protruding from the cover plate 1, and improves space utilization.

[0051] More specifically, a weight-reducing groove is provided on the inner wall of the mounting groove 12, and the weight-reducing groove extends along the circumference of the inner wall of the mounting groove 12. The provision of the weight-reducing groove 121 can reduce the weight of the cover assembly to a certain extent and facilitate processing.

[0052] Preferably, in this embodiment, if the thickness of the cover plate 1 is Hmm, the depth of the weight-reducing groove is no more than 0.5Hmm, which improves space utilization without affecting the overall strength of the cover plate 1.

[0053] More specifically, when the interference rib 40 is disposed on the outer circumference of the connecting boss 21, an inclined guide surface 41 is provided at the bottom end of the interference rib 40. When the interference rib 40 is disposed on the inner wall of the tab through-hole 10, an inclined guide surface 41 is provided at the top surface of the interference rib 40. The provision of the guide surface 41 allows one of the first plastic part 2 and the cover plate 1 to slide relative to the other along the guide surface 41, facilitating assembly of the first plastic part 2 onto the cover plate 1.

[0054] More specifically, the guide surface 41 is a curved surface or a flat surface. In this embodiment, the guide surface 41 is a flat surface, which has low mold cost, simple processing, and is not easy to damage.

[0055] Specifically, the cross-sectional projection of the interference rib 40 in the vertical direction is at least one of a U-shape, a V-shape or a wave shape. The above arrangement can increase the contact area between the first plastic part 2 and the cover plate 1 and increase the interference.

[0056] Preferably, in this embodiment, the vertical cross-sectional projection of the interference rib 40 is V-shaped and chamfered to facilitate assembly of the first plastic part 2 on the cover plate 1. In other embodiments, the vertical cross-sectional projection of the interference rib 40 may be U-shaped or wavy, which is not specifically limited here.

[0057] Specifically, the horizontal cross-sectional projection of the interference rib 40 is at least one of a vertical strip, an inclined strip, or a wave shape. The above arrangement can increase the contact area between the first plastic part 2 and the cover plate 1 and increase the interference.

[0058] Preferably, in this embodiment, the cross-sectional projection of the interference rib 40 in the horizontal direction is a vertical strip. In other embodiments, the cross-sectional projection of the interference rib 40 in the horizontal direction is either an inclined strip or a wave shape, which is not specifically limited here.

[0059] Preferably, the connecting boss 21 is annular, and when the interference ribs 40 are disposed on the outer periphery of the connecting boss 21, the interference ribs 40 are disposed on at least two outer peripheries of the connecting boss 21. This arrangement ensures a more balanced force distribution on the connecting boss 21. In this embodiment, the interference ribs 40 are disposed on both outer peripheries of the connecting boss 21 along its length.

[0060] Preferably, each outer circumferential surface provided with interference ribs 40 has 2-4 interference ribs 40 to increase the contact area between the connecting boss 21 and the cover plate 1. In this embodiment, each outer circumferential surface provided with interference ribs 40 has 4 interference ribs 40 spaced apart.

[0061] Preferably, the tab through-hole 10 is rectangular. When the interference ribs 21 are provided on the inner wall of the tab through-hole 10, interference ribs 40 are provided on at least two inner walls of the tab through-hole 10. This arrangement ensures a more balanced force on the connecting boss 21. In this embodiment, the interference ribs 40 are provided on both inner circumferences of the lengthwise direction of the tab through-hole 10.

[0062] Preferably, each inner circumferential surface is provided with interference ribs 40 , and the number of interference ribs 40 is 2-4, so as to increase the contact area between the connecting boss 21 and the cover plate 1 .

[0063] Specifically, a receiving groove is provided on the top surface of the first plastic part 2 for mounting a connecting piece or a tab. The provision of the receiving groove can improve the versatility of the cover assembly and, while increasing space utilization, can further reduce deadweight.

[0064] Specifically, the cover plate 1 is provided with an explosion-proof valve 11, and the second plastic part 3 is provided with a vent 31, which is located below the explosion-proof valve 11. The provision of the explosion-proof valve 11 ensures that in the event of thermal runaway of the battery, high-temperature gases inside the battery can be discharged to the outside of the battery through the vent 31 and the explosion-proof valve 11 in sequence, thereby ensuring the safety of the battery.

[0065] More specifically, the cover plate 1 is provided with an explosion-proof hole 13, and a cross-shaped mounting bracket 131 is provided on the inner wall of the explosion-proof hole 13. The explosion-proof valve 11 is located on the side of the mounting bracket 131 away from the second plastic part 3. The installation of the mounting bracket 131 facilitates the installation of the explosion-proof valve 11 while also ensuring that the explosion-proof hole 13 is connected to the exhaust hole 31, facilitating the discharge of high-temperature gases within the battery in the event of thermal runaway.

[0066] Preferably, in this embodiment, the exhaust holes 31 are distributed in an array, with two rows spaced apart along the length of the cover plate 1, each row including four holes spaced apart. This ensures the strength of the cover plate 1 while increasing the connection area between the exhaust holes 31 and the explosion-proof holes 13. In other embodiments, the exhaust holes 31 may also be distributed in other ways, which are not specifically limited here.

[0067] Specifically, explosion-proof scratches are etched on the explosion-proof valve 11. The provision of such explosion-proof scratches can change the force distribution of the explosion-proof valve 11, so that when subjected to the impact of an explosion, the explosion-proof valve 11 can explode and flip along the explosion-proof scratches, quickly and safely discharging high-temperature gases. At the same time, it prevents the explosion-proof valve 11 from forming fragments that separate from the battery when subjected to the impact of an explosion, thereby improving the overall safety of the battery.

[0068] In this embodiment, the explosion-proof scratch is provided on the side of the explosion-proof valve 11 facing the second plastic part 3; in other embodiments, the explosion-proof scratch can also be provided on the side of the explosion-proof valve 11 facing away from the second plastic part 3, which is not specifically limited here.

[0069] More specifically, a limiting step 132 is provided in the explosion-proof hole 13. The limiting step 132 is annular and extends along the circumference of the explosion-proof hole 13. When the explosion-proof valve 11 abuts against the mounting bracket 131, its outer circumference can abut against the limiting step 132. The provision of the limiting step 132 can prevent the explosion-proof valve 11 from shaking in the explosion-proof hole 13, facilitating the assembly of the explosion-proof valve 11.

[0070] Specifically, the cover plate 1 is provided with an injection hole 14 for injecting electrolyte into the battery. The second plastic part 3 is provided with a diversion hole 32, which is connected to the injection hole 14 to guide the electrolyte into the battery. In this embodiment, the injection hole 14 is provided between the explosion-proof valve 11 and the positive electrode tab. In other embodiments, the injection hole 14 can also be provided between the explosion-proof valve 11 and the negative electrode tab, as long as the injection hole 14 is located near the tab. This is not a specific limitation.

[0071] More specifically, a guide groove 15 is provided on the cover plate 1 along the circumference of the injection hole 14, and the guide groove 15 is connected to the injection hole 14. The provision of the guide groove 15 can collect splashed electrolyte and improve the convenience of battery assembly.

[0072] Preferably, in this embodiment, the openings of the injection hole 14 , the guide hole 32 and the guide groove 15 are all circular, so as to prevent stress concentration on the cover plate 1 and the second plastic part 3 and improve the strength and durability of both.

[0073] The present invention also provides a battery for storing, discharging, and charging electricity, comprising a housing, a battery cell, and the aforementioned interference-fit cover assembly. The housing has an opening; the battery cell is disposed within the housing; and the interference-fit cover assembly is configured to seal the opening. This battery exhibits all the beneficial effects of the aforementioned interference-fit cover assembly, which will not be elaborated upon here.

[0074] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods 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. Interference fit cover plate assembly, characterized in that: include: The cover plate is provided with a tab through hole; A first plastic part is located on the top of the cover plate, the first plastic part is provided with a first through hole, and the first plastic part is interference-fitted with the tab through hole; a second plastic part in a plate shape, the second plastic part being located at the bottom of the cover plate and having a second through hole; The tab can pass through the second through hole, the tab through hole and the first through hole in sequence, and the second through hole, the tab through hole and the first through hole correspond to each other one by one.

2. The interference fit cover plate assembly according to claim 1, wherein: A connecting boss is provided at the bottom of the first plastic part. The connecting boss extends along the circumference of the first through hole and can extend into the tab through hole. Interference ribs are provided on the outer circumference of the connecting boss and / or the inner wall of the tab through hole.

3. The interference fit cover plate assembly according to claim 2, wherein: When the interference rib is provided on the outer peripheral side of the connecting boss, the bottom end of the interference rib is provided with an inclined guide surface; When the interference rib is arranged on the inner wall of the tab through hole, the top surface of the interference rib is provided with an inclined guide surface.

4. The interference fit cover plate assembly according to claim 3, characterized in that: The guide surface is a curved surface or a flat surface.

5. The interference fit cover plate assembly according to claim 2, wherein: The cross-sectional projection of the interference rib in the vertical direction is at least one of U-shape, V-shape or wave-shape.

6. The interference fit cover plate assembly according to claim 2, wherein: The cross-sectional projection of the interference rib in the horizontal direction is at least one of a vertical strip, an inclined strip or a wave shape.

7. The interference fit cover plate assembly according to claim 2, wherein: The connecting boss is annular, and when the interference rib is provided on the outer peripheral side of the connecting boss, the interference rib is provided on at least two outer peripheral surfaces of the connecting boss, respectively.

8. The interference fit cover plate assembly according to claim 2, wherein: The tab through hole is rectangular. When the interference rib is provided on the inner wall of the tab through hole, the interference rib is provided on at least two inner circumferential surfaces of the tab through hole.

9. The interference fit cover plate assembly according to any one of claims 1 to 8, characterized in that: An explosion-proof valve is provided on the cover plate, and an exhaust hole is provided on the second plastic part. The exhaust hole is located below the explosion-proof valve.

10. A battery, characterized in that include: a housing having an opening; A battery cell is disposed inside the housing; The interference fit cover plate assembly according to any one of claims 1 to 9, wherein the interference fit cover plate assembly seals the opening.

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