Interference fit cover plate connecting structure and battery

Abstract

The utility model belongs to the technical field of power batteries, and discloses an interference fit cover plate connecting structure and a battery, and the cover plate connecting structure 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 battery 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 whole structure is customized.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field especially, relates to a kind of interference fit cover plate connecting structure and battery. BACKGROUND

[0002] The cover plate connecting structure of power battery as key part, play sealing, fixed and insulation etc., cover plate connecting structure includes tab, light aluminum plate and first plastic piece and second plastic piece, aluminum sheet and second plastic piece all have tab mounting hole for tab installation, tab is used for the electrical connection of electric core and external electrical device, cover plate connecting structure whole assembly, tab passes tab mounting hole of second plastic piece, light aluminum plate and first plastic piece in turn.

[0003] Traditional cover plate first plastic piece is in the outside of cover plate, second plastic piece thickness is greater, leading to its in the shell interior occupies too large space, electric core volume decreases in turn, to affect the overall capacity of battery. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of interference fit cover plate connecting structure and battery, small to the space occupation of battery interior, it is convenient to assemble.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Interference fit cover plate connecting structure, comprising:

[0007] Cover plate, tab through-hole is set up;

[0008] First plastic piece, located at the top of the cover plate, the first plastic piece is set up with first through-hole;

[0009] Second plastic piece, it is board-like, the second plastic piece is located at the bottom of the cover plate, the second plastic piece is set up with second through-hole, the first plastic piece passes through the tab through-hole and is interfered with the second through-hole;

[0010] Tab, can pass through second through-hole, tab through-hole and first through-hole in turn, second through-hole, tab through-hole and first through-hole one-to-one.

[0011] As preferred, the first plastic piece bottom is provided with first connecting boss, the first connecting boss extends along the circumference of the first through-hole, the first connecting boss can be inserted into tab through-hole and second through-hole in turn, the outer circumferential side of the first connecting boss and / or the inner wall of the second through-hole is provided with interference rib.

[0012] As preferred, the second plastic part top is provided with a second connecting boss extending along the circumference of the second through hole, the second connecting boss can extend into the tab through hole, when the interference fit is arranged on the inner wall of the second through hole, one end of the interference fit is arranged on the inner wall of the second through hole, and the other end is arranged on the inner circumferential side of the second connecting boss.

[0013] As preferred, when the interference fit is arranged on the outer circumferential side of the first connecting boss, the bottom end of the interference fit is provided with an inclined guide surface.

[0014] When the interference fit is arranged on the inner wall of the second through hole, the top surface of the interference fit is provided with an inclined guide surface.

[0015] As preferred, the guide surface is an arc surface or a plane.

[0016] As preferred, the cross-sectional projection of the interference fit in the vertical direction is at least one of U-shaped, V-shaped or wavy.

[0017] As preferred, the cross-sectional projection of the interference fit in the horizontal direction is at least one of a vertical strip, an inclined strip or a wave shape.

[0018] As preferred, the first connecting boss is annular, and when the interference fit is arranged on the outer circumferential side of the first connecting boss, the interference fit is arranged on at least two outer circumferential surfaces of the first connecting boss, respectively.

[0019] As preferred, the second through hole is rectangular, and when the interference fit is arranged on the inner wall of the second through hole, the interference fit is arranged on at least two inner circumferential surfaces of the tab through hole.

[0020] A battery comprises:

[0021] A shell is provided with an opening.

[0022] An electric core is arranged inside the shell.

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

[0024] The utility model discloses beneficial effects:

[0025] The cover plate is located between the first plastic part and the second plastic part, the second plastic part is plate-shaped, so as to greatly reduce the volume and improve the space utilization, the cover plate is provided with a tab through hole, the first plastic part is in interference fit with the second through hole, the fixed connection of the first plastic part and the second plastic part can be realized without other fasteners or fixing parts, and the first plastic part is provided with a first through hole, the second plastic part is provided with a second through hole, the second through hole, the tab through hole and the first through hole are one-to-one corresponding, the tab can pass through the second through hole, the tab through hole and the first through hole in sequence, the cost is low, the structure is simple and durable, the assembly is convenient, the universality is strong, the number of the tab can be determined according to actual needs, so that the overall structure is customized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structure explosion diagram of one direction of the interference fit cover plate connecting structure of the utility model;

[0027] Figure 2 is a structure explosion diagram of another direction of the interference fit cover plate connecting structure of the utility model;

[0028] Figure 3 is Figure 1 is a local enlarged view of A in figure;

[0029] Figure 4 is a structure schematic diagram of one direction of the interference fit cover plate connecting structure of the utility model;

[0030] Figure 5 is a structure schematic diagram of another direction of the interference fit cover plate connecting structure of the utility model.

[0031] In the figure:

[0032] 1, cover plate; 10, tab through hole; 11, explosion-proof valve; 12, mounting groove; 13, explosion-proof hole; 131, mounting frame; 132, limiting step; 14, liquid injection hole; 15, flow guide groove;

[0033] 2, first plastic part; 20, first through hole; 21, first connecting boss;

[0034] 3, second plastic part; 30, second through hole; 31, exhaust hole; 32, flow guide hole; 33, second connecting boss

[0035] 40, interference rib; 41, guide surface. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0040] like Figures 1-5 As shown, the present invention provides an interference fit cover plate connection structure for sealing the opening of a battery housing, the cover plate connection structure 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; 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 first plastic part 2 passes through the tab through hole 10 and is interference fit with the second through hole 30, so that the tab can pass through the second through hole 30, the tab through hole 10 and the first through hole 20 in sequence, with the second through hole 30, the tab through hole 10 and the first through hole 20 corresponding to each other.

[0041] The cover plate 1 is located between the first plastic part 2 and the second plastic part 3, the second plastic part 3 is in the form of a plate to reduce the volume and improve space utilization, the cover plate 1 is provided with a tab through hole 10, the first plastic part 2 is in interference fit with the second through hole 30, without the need for other fasteners or fixing parts to realize the fixed connection of the first plastic part 2 and the second plastic part 3, and the first plastic part 2 is provided with a first through hole 20, 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 by one, the tab can pass through the second through hole 30, the tab through hole 10 and the first through hole 20 in turn, the production cost is low, the structure is simple and durable, easy to assemble, and the versatility is strong, the number of tabs can be determined according to actual needs, so as to customize the overall structure.

[0042] It can be understood that the tab includes a positive tab and / or a negative tab, and the type of tab can be determined according to the 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, and each tab passes through the second through hole 30, the tab through hole 10 and the first through hole 20 in turn and is folded to improve the space utilization inside the battery shell.

[0043] Specifically, the first plastic part 2 can be integrated or split. In this embodiment, the first plastic part 2 is provided in a split form, that is, the tab corresponds to the first plastic part 2 one by one. In other embodiments, the first plastic part 2 can also be provided in an integrated form, that is, a plurality of tabs correspond to one first plastic part 2.

[0044] Specifically, the second plastic part 3 can be integrated or split. In this embodiment, the second plastic part 3 is provided in an integrated form, that is, a plurality of tabs correspond to one second plastic part 3. In other embodiments, the second plastic part 3 can also be provided in an integrated form, that is, the tab corresponds to the second plastic part 3 one by one.

[0045] In this embodiment, the cover plate connecting structure is provided with two tabs, 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, which is not limited here.

[0046] Specifically, the first plastic part 2 is provided with a first connecting boss 21 at the bottom, the first connecting boss 21 extends along the circumference of the first through hole 20, the first connecting boss 21 can extend into the tab through hole 10, and the outer circumferential side of the first connecting boss 21 and / or the inner wall of the second through hole 30 is provided with an interference rib 40. The above-mentioned setting realizes the interference fit between the first connecting boss 21 and the second through hole 30 through the interference rib 40, which is simple to produce and process, low in mold cost and easy to assemble.

[0047] Preferably, in the embodiment, the cover plate 1 is rectangular, and the first plastic part 2 is provided with two first connecting bosses 21 arranged at intervals along the width direction of the cover plate 1, and each first connecting boss 21 is 1mm-10mm away from the edge of the first plastic part 2. The above arrangement facilitates the installation of the first plastic part 2 on the cover plate 1, and also ensures that the self-weight of the first plastic part 2 is not too large, effectively controls the cost, and saves raw materials.

[0048] Preferably, in the embodiment, the interference amount of the interference rib 40 in the horizontal direction relative to the inner wall of the first connecting boss 21 or the second through hole 30 is adjusted to be 0.05mm-0.30mm. The above arrangement ensures that the interference rib 40 has sufficient contact area with the inner wall of the first connecting boss 21 or the second through hole 30 to ensure the reliability of the connection, and also prevents the first plastic part 2 from being unable to be assembled on the cover plate 1 due to excessive interference amount.

[0049] More specifically, the cover plate 1 is provided with a mounting groove 12, and the tab through hole 10 is arranged at the groove bottom of the mounting groove 12, and the first plastic part 2 can be placed in the mounting groove 12. The above arrangement of the mounting groove 12 makes the fit between the cover plate 1 and the first plastic part 2 higher, reduces the volume of the first plastic part 2 protruding from the cover plate 1, and improves the space utilization.

[0050] More specifically, the inner wall of the mounting groove 12 is provided with a weight-reducing groove extending along the circumference of the inner wall of the mounting groove 12. The above arrangement of the weight-reducing groove can reduce the self-weight of the cover plate connecting structure to a certain extent and is convenient for processing.

[0051] Preferably, in the embodiment, if the thickness of the cover plate 1 is Hmm, the depth of the weight-reducing groove is not higher than 0.5Hmm, which improves the space utilization without affecting the overall strength of the cover plate 1.

[0052] Specifically, the second plastic part 3 is provided with a second connecting boss 33 at the top, the second connecting boss 33 extends along the circumference of the second through hole 30, the second connecting boss 33 can extend into the tab through hole 10, and when the interference rib 40 is arranged on the inner wall of the second through hole 30, one end of the interference rib 40 is arranged on the inner wall of the second through hole 30, and the other end is arranged on the inner circumferential side of the second connecting boss 33. The above arrangement of the second connecting boss 33 can increase the contact area between the second plastic part 3 and the first plastic part 2, and when the interference rib 40 is arranged on the inner wall of the second through hole 30, the arrangement of the second connecting boss 33 can increase the length of the interference rib 40 to a certain extent, thereby improving the connection strength between the second plastic part 3 and the first plastic part 2.

[0053] Preferably, in the present embodiment, the second connecting boss 33 penetrates the tab through hole 10 from the bottom surface of the cover plate 1 and penetrates the tab through hole 10 from the top surface of the cover plate 1, so as to further increase the contact area and the connecting strength between the second plastic part 3 and the first plastic part 2 and facilitate assembly.

[0054] More specifically, when the interference rib 40 is arranged on the outer circumferential side of the first connecting boss 21, the bottom end of the interference rib 40 is provided with an inclined guide surface 41; when the interference rib 40 is arranged on the inner wall of the second through hole 30, the top surface of the interference rib 40 is provided with an inclined guide surface 41. The arrangement of the guide surface 41 allows one of the first plastic part 2 and the second plastic part 3 to slide along the guide surface 41 relative to the other, thereby facilitating assembly.

[0055] More specifically, the guide surface 41 is an arc surface or a plane. In the present embodiment, the guide surface 41 is a plane, which is low in mold cost and simple to process and is not easy to damage.

[0056] 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 of the first plastic part 2 with the cover plate 1 and increase the interference amount.

[0057] Preferably, in the present embodiment, the cross-sectional projection of the interference rib 40 in the vertical direction is a V shape and is provided with a chamfer, thereby facilitating assembly. In other embodiments, the cross-sectional projection of the interference rib 40 in the vertical direction can be a U shape or a wave shape, which is not specifically limited herein.

[0058] Specifically, the cross-sectional projection of the interference rib 40 in the horizontal direction is at least one of a vertical strip shape, an inclined strip shape or a wave shape. The above arrangement can increase the contact area of the first plastic part 2 with the second plastic part 3 and increase the interference amount.

[0059] Preferably, in the present embodiment, the cross-sectional projection of the interference rib 40 in the horizontal direction is a vertical strip shape. In other embodiments, the cross-sectional projection of the interference rib 40 in the horizontal direction can be an inclined strip shape or a wave shape, which is not specifically limited herein.

[0060] Preferably, the first connecting boss 21 is annular, and when the interference rib 40 is arranged on the outer circumferential side of the first connecting boss 21, the interference rib 40 is arranged on at least two outer circumferential surfaces of the first connecting boss 21. The above arrangement makes the stress on the first connecting boss 21 more balanced. In the present embodiment, the interference rib 40 is arranged on two outer circumferential surfaces in the length direction of the first connecting boss 21.

[0061] Preferably, the outer circumferential surface of each of the first connecting boss 21 is provided with 2-4 interference ribs 40 to increase the contact area between the first connecting boss 21 and the second plastic part 3. In the embodiment, 4 interference ribs 40 are provided on the outer circumferential surface of each of the first connecting boss 21.

[0062] Preferably, the second through hole 30 is rectangular, and at least two inner walls of the second through hole 30 are provided with interference ribs 40 when the interference ribs 40 are arranged on the inner walls of the second through hole 30. The arrangement makes the force on the first connecting boss 21 more balanced. In the embodiment, the interference ribs 40 are arranged on the two inner circumferential surfaces in the length direction of the second through hole 30.

[0063] Preferably, the inner circumferential surface of each of the second through hole 30 provided with the interference ribs 40 is provided with 2-4 interference ribs 40 to increase the contact area between the first connecting boss 21 and the second plastic part 3.

[0064] Specifically, the top surface of the first plastic part 2 is provided with a receiving groove for mounting a connecting tab or a tab. The arrangement of the receiving groove can improve the versatility of the cover plate connecting structure, and can further reduce the weight while improving the space utilization.

[0065] Specifically, the cover plate 1 is provided with a pressure relief valve 11, and the second plastic part 3 is provided with an exhaust hole 31 located below the pressure relief valve 11. The arrangement of the pressure relief valve 11 allows the high-temperature gas inside the battery to be discharged to the outside of the battery through the exhaust hole 31 and the pressure relief valve 11 in sequence when the battery is in thermal runaway, ensuring the safety of the battery.

[0066] More specifically, the cover plate 1 is provided with a pressure relief hole 13, and the inner wall of the pressure relief hole 13 is provided with a cross-shaped mounting bracket 131, and the pressure relief valve 11 is located on the side of the mounting bracket 131 away from the second plastic part 3. The arrangement of the mounting bracket 131 facilitates the installation of the pressure relief valve 11 and ensures the communication between the pressure relief hole 13 and the exhaust hole 31, facilitating the discharge of the high-temperature gas inside the battery when the battery is in thermal runaway.

[0067] Preferably, in the embodiment, the exhaust holes 31 are arranged in an array, and two rows are arranged along the length direction of the cover plate 1, each row including four exhaust holes 31 arranged at intervals, which ensures the strength of the cover plate 1 and increases the communication area between the exhaust holes 31 and the pressure relief hole 13. In other embodiments, the exhaust holes 31 can also adopt other distribution modes, which are not limited here.

[0068] Specifically, the explosion-proof valve 11 is etched with an explosion-proof notch. The explosion-proof notch can change the stress distribution of the explosion-proof valve 11, so that the explosion-proof valve 11 can be opened and turned along the explosion-proof notch during the explosion impact, and the high-temperature gas can be quickly and safely discharged, and the explosion-proof valve 11 is prevented from forming fragments that are separated from the battery when the explosion impact is received, thereby improving the overall safety of the battery.

[0069] In the embodiment, the explosion-proof notch is arranged on the side of the explosion-proof valve 11 facing the second plastic part 3, and in other embodiments, the explosion-proof notch can also be arranged on the side of the explosion-proof valve 11 facing away from the second plastic part 3, which is not limited here.

[0070] More specifically, a limiting step 132 is arranged in the explosion-proof hole 13, the limiting step 132 is annular and extends along the circumference of the explosion-proof hole 13, and the outer circumferential side of the explosion-proof valve 11 can abut against the limiting step 132 when the explosion-proof valve 11 abuts against the mounting frame 131. The arrangement of the limiting step 132 can prevent the explosion-proof valve 11 from shaking in the explosion-proof hole 13, and facilitate the assembly of the explosion-proof hole 13.

[0071] Specifically, the cover plate 1 is further provided with a liquid injection hole 14 for injecting electrolyte into the battery, and the second plastic part 3 is provided with a flow guide hole 32 which is communicated with the liquid injection hole 14 to guide the electrolyte into the battery. In the embodiment, the liquid injection hole 14 can also be arranged between the explosion-proof valve 11 and the positive electrode lug, and in other embodiments, the liquid injection hole 14 is arranged between the explosion-proof valve 11 and the negative electrode lug, as long as the liquid injection hole 14 is located near the lug, which is not limited here.

[0072] More specifically, the cover plate 1 is provided with a flow guide groove 15 along the circumference of the liquid injection hole 14, and the flow guide groove 15 is communicated with the liquid injection hole 14. The arrangement of the flow guide groove 15 can collect the splashed electrolyte and improve the convenience of battery assembly.

[0073] Preferably, in the embodiment, the openings of the liquid injection hole 14, the flow guide hole 32 and the flow guide groove 15 are circular to prevent stress concentration on the cover plate 1 and the second plastic part 3, and improve the strength and durability of the two.

[0074] The utility model also provides a battery for storing electricity, discharging and charging, which comprises a shell, a cell and the above-mentioned interference fit cover plate connecting structure. The shell is provided with an opening; the cell is arranged in the interior of the shell; and the interference fit cover plate connecting structure is configured to seal the opening. The battery has all the beneficial effects of the above-mentioned interference fit cover plate connecting structure, and details are not repeated here.

[0075] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. An interference fit cover plate connection structure, characterized by, The application relates to a cover plate connection structure with interference fit. The cover plate is provided with a tab through hole. A first plastic part is arranged on the top of the cover plate, and the first plastic part is provided with a first through hole. A second plastic part is arranged on the bottom of the cover plate, and the second plastic part is provided with a second through hole. A tab can pass through the second through hole, the tab through hole and the first through hole in sequence.

2. The interference fit cover plate connection structure according to claim 1, characterized by The first plastic part is provided with a first connecting boss at the bottom, the first connecting boss extends along the circumference of the first through hole, the first connecting boss can extend into the tab through hole and the second through hole, and an interference rib is arranged on the outer circumferential side of the first connecting boss and / or the inner wall of the second through hole.

3. The interference fit cover plate connection structure according to claim 2, characterized by The second plastic part is provided with a second connecting boss at the top, the second connecting boss extends along the circumference of the second through hole, the second connecting boss can extend into the tab through hole, and when the interference rib is arranged on the inner wall of the second through hole, one end of the interference rib is arranged on the inner wall of the second through hole, and the other end is arranged on the inner circumferential side of the second connecting boss.

4. The interference fit cover plate connection structure according to claim 2, characterized by When the interference rib is arranged on the outer circumferential side of the first 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 second through hole, the top surface of the interference rib is provided with an inclined guide surface.

5. The interference fit cover plate connection structure according to claim 4, characterized by The guide surface is an arc surface or a plane.

6. The interference fit cover plate connection structure according to claim 2, characterized by The cross-sectional projection of the interference rib in the vertical direction is at least one of a U shape, a V shape or a wave shape.

7. The interference fit cover plate connection structure according to claim 2, characterized by The cross-sectional projection of the interference rib in the horizontal direction is at least one of a vertical strip shape, an inclined strip shape or a wave shape.

8. The interference fit cover plate connection structure of claim 2, wherein The first connecting boss is annular, and when the interference rib is arranged on the outer circumferential side of the first connecting boss, the interference rib is arranged on at least two outer circumferential surfaces of the first connecting boss.

9. The interference fit cover plate connection structure of claim 2, wherein The second through hole is rectangular, and when the interference rib is arranged on the inner wall of the second through hole, the interference rib is arranged on at least two inner circumferential surfaces of the tab through hole.

10. A battery characterized by The application relates to a cover plate connection structure with interference fit. The application relates to a cover plate connection structure with interference fit. The application relates to a cover plate connection structure with interference fit. ​

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