Lower plastic, top cover assembly, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to lower plastic cement, a top cover assembly, a battery and electric equipment, the lower plastic cement comprises a lower plastic cement body, the lower plastic cement body is provided with a convex part, and the convex part is used for abutting against the middle part of the lower surface of an explosion-proof valve; the explosion-proof valve is effectively supported by the convex part, so that the explosion-proof valve is effectively prevented from being arched downwards in the periodic change process of the external pressure and the internal pressure of the battery, the fatigue life of the explosion-proof valve plate is prolonged to a certain extent, and the risk of explosion of the explosion-proof valve under the condition that the internal pressure of the battery does not reach a pressure relief value is reduced; and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to a lower plastic, a top cover component, a battery and an electrical device. Background Art

[0002] As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. They have broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] The battery cover is typically equipped with an explosion-proof valve. When the internal pressure reaches a threshold, the valve ruptures, allowing the gas inside the battery to escape through the valve, preventing explosion and improving battery safety. However, during the battery manufacturing process, the battery undergoes breathing operations such as liquid injection and vacuum pumping, which causes periodic fluctuations in the internal pressure of the battery. During this cyclical change in external pressure and internal pressure, the explosion-proof valve floats back and forth under the influence of the pressure. As a result, the explosion-proof valve is prone to fatigue failure, causing it to rupture before the internal pressure of the battery reaches the threshold, leading to failure. Utility Model Content

[0004] The purpose of the present utility model is to provide a lower plastic to address the deficiencies of the prior art, thereby solving the technical problem in the prior art that the explosion-proof valve will float back and forth during the periodic changes in the external pressure and the internal pressure of the battery, resulting in the explosion-proof valve being prone to fatigue failure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A lower plastic comprises a lower plastic body. The lower plastic body is provided with a convex portion, and the convex portion is used to abut against the middle portion of the lower surface of the explosion-proof valve.

[0007] Preferably, along the length direction of the lower plastic body, a first pressure relief chamber and a second pressure relief chamber are provided on the lower plastic body, the second pressure relief chamber is located on at least one side of the first pressure relief chamber and is connected to the first pressure relief chamber, a first through hole is provided in both the first pressure relief chamber and the second pressure relief chamber, and the convex portion is provided in the first pressure relief chamber.

[0008] Preferably, the bottom of the first pressure relief chamber protrudes toward the lower surface of the lower plastic body to form a first protrusion, and the bottom of the second pressure relief chamber protrudes toward the lower surface of the lower plastic body to form a second protrusion, and the height of the second protrusion is smaller than the height of the first protrusion.

[0009] Another object of the present utility model is to provide a top cover assembly, comprising a cover plate, a conductive component, an explosion-proof valve and the lower plastic described above in the specification, wherein the lower plastic is arranged on the lower surface of the cover plate, a first mounting hole is provided on the cover plate, a second mounting hole corresponding to the first mounting hole is provided on the lower plastic, the conductive component passes through the first mounting hole and the second mounting hole, the explosion-proof valve is arranged on the cover plate, and the protrusion abuts against the middle part of the lower surface of the explosion-proof valve.

[0010] Preferably, the explosion-proof valve includes an explosion-proof plate and a protective plate, the cover plate is provided with a pressure relief port, the explosion-proof plate and the protective plate are both provided at the pressure relief port of the cover plate, the protective plate is located above the explosion-proof plate, and the convex portion abuts against the middle of the lower surface of the explosion-proof plate.

[0011] Preferably, the conductive component includes a first conductive member, a second conductive member, an upper plastic and an insulating seal. The upper plastic and the first conductive member are sequentially arranged on the upper surface of the cover plate. The upper plastic and the first conductive member correspond to the positions of the first mounting hole. The second conductive member is arranged on the lower surface of the lower plastic body. Part of the second conductive member passes through the second mounting hole, the first mounting hole and the upper plastic to be connected to the first conductive member. The insulating seal is arranged between the cover plate and the second conductive member.

[0012] Preferably, the cover plate is provided with a liquid injection hole, the lower plastic is provided with a second through hole corresponding to the liquid injection hole, a sealing member is provided in the liquid injection hole, and the cover plate is provided with a groove, which is provided around the liquid injection hole.

[0013] Preferably, the distance between the groove and the liquid injection hole is greater than or equal to 0.5 mm.

[0014] Another object of the present invention is to provide a battery, comprising the top cover assembly described above in the specification.

[0015] Another object of the present invention is to provide an electrical device comprising the battery described above in the specification.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] The lower plastic of the utility model is provided with a convex portion on the lower plastic body, and the convex portion is used to abut against the middle part of the lower surface of the explosion-proof valve, thereby effectively supporting the explosion-proof valve through the convex portion, and effectively preventing the explosion-proof valve from arching downward during the cyclic change of external pressure and internal pressure of the battery. To a certain extent, the fatigue life of the explosion-proof valve plate is improved, the risk of the explosion-proof valve bursting when the internal pressure of the battery has not reached the pressure relief value is reduced, and the service life of the battery is extended.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a structural schematic diagram of the top cover assembly of the utility model.

[0021] Figure 2 This is an exploded view of the top cover assembly of the utility model.

[0022] Figure 3 It is a cross-sectional view of the top cover assembly of the utility model.

[0023] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0025] Figure 6 for Figure 3 Schematic diagram of the enlarged structure at point C in the middle.

[0026] Figure 7 This is a schematic diagram of the structure of the lower plastic of the utility model.

[0027] Figure 8 This is a structural diagram of the cover plate of the utility model.

[0028] Figure 9 This is a schematic structural diagram of the explosion-proof disk of the utility model.

[0029] The description of the accompanying drawings is as follows:

[0030] 100. Top cover assembly;

[0031] 10. Lower plastic; 11. Protrusion; 12. First pressure relief chamber; 121. First raised portion; 122. Reinforcement rib; 123. Pressure relief unit; 13. Second pressure relief chamber; 131. Second raised portion; 14. First through hole; 15. Second through hole; 16. Third raised portion; 17. Second mounting hole;

[0032] 20. Cover plate; 21. First mounting hole; 22. Pressure relief port; 23. Liquid injection hole; 24. Groove;

[0033] 30. Conductive component; 31. First conductive member; 32. Second conductive member; 33. Plastic coating; 34. Insulating seal;

[0034] 40. Explosion-proof valve; 41. Explosion-proof disk; 411. Connecting portion; 412. Arc-shaped portion; 413. Weak portion; 42. Protective plate;

[0035] 50. Seals;

[0036] a, length direction of the lower plastic body; b, width direction of the lower plastic body; L, distance between the groove and the injection hole. DETAILED DESCRIPTION

[0037] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0038] Furthermore, the terms “first,” “second,” etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0039] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0040] The following will be combined with the Figure 1 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] The electrical equipment of the embodiment of the present utility model includes a battery. The electrical equipment can be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The car can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes airplanes, rockets, space shuttles, and spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical equipment.

[0042] The battery of the embodiment of the present invention includes a shell, a battery cell and a top cover assembly 100. The top cover assembly 100 covers the opening of the shell and forms an accommodating cavity with the shell. The battery cell is arranged in the accommodating cavity.

[0043] See also Figures 1 to 9 The top cover assembly 100 of the present embodiment includes a cover plate 20, a conductive component 30, an explosion-proof valve 40, and a lower plastic 10. The lower plastic 10 is disposed on the lower surface of the cover plate 20. The cover plate 20 is provided with a first mounting hole 21, and the lower plastic 10 is provided with a second mounting hole 17 corresponding to the first mounting hole 21. The conductive component 30 passes through the first mounting hole 21 and the second mounting hole 17, and the explosion-proof valve 40 is disposed on the cover plate 20. The lower plastic 10 is disposed between the battery cell and the cover plate 20 to prevent the battery cell from contacting the cover plate 20 and causing a short circuit in the battery.

[0044] See also Figures 2-4 、 Figure 7 The lower plastic 10 of the embodiment of the present invention includes a lower plastic body 10 , on which a convex portion 11 is provided. The convex portion 11 is used to abut against the middle portion of the lower surface of the explosion-proof valve 40 .

[0045] Compared with the prior art, the lower plastic 10 of the embodiment of the present invention has a convex portion 11 provided on the main body of the lower plastic 10, and the convex portion 11 is used to abut against the middle part of the lower surface of the explosion-proof valve 40, thereby effectively supporting the explosion-proof valve 40 through the convex portion 11, effectively preventing the explosion-proof valve 40 from arching downward during the cyclic change of the external pressure and the internal pressure of the battery, thereby improving the fatigue life of the explosion-proof valve 40 to a certain extent, reducing the risk of the explosion-proof valve 40 bursting when the internal pressure of the battery has not reached the pressure relief value, and extending the service life of the battery.

[0046] See also Figure 4、 Figure 7 In some embodiments, along the length direction a of the lower plastic body, a first pressure relief chamber 12 and a second pressure relief chamber 13 are provided on the lower plastic body 10. The second pressure relief chamber 13 is located on at least one side of the first pressure relief chamber 12 and is in communication with the first pressure relief chamber 12. A first through hole 14 is provided in each of the first pressure relief chamber 12 and the second pressure relief chamber 13, and the protrusion 11 is provided in the first pressure relief chamber 12. By using the first pressure relief chamber 12 and the second pressure relief chamber 13 in conjunction with each other, the first through hole 14 is provided in each of the first pressure relief chamber 12 and the second pressure relief chamber 13. When thermal runaway occurs in the battery, the gas inside the battery can enter the first pressure relief chamber 12 and the second pressure relief chamber 13 through the first through hole 14, and cooperate with the explosion-proof valve 40 to provide a release channel for the gas inside the battery, thereby preventing the battery from exploding and improving the safety of the battery. In addition, the convex portion 11 is arranged in the first pressure relief chamber 12. The convex portion 11 is used to support the explosion-proof valve 40, effectively preventing the explosion-proof valve 40 from arching downward during the cyclic change of external pressure and internal pressure of the battery, thereby improving the fatigue life of the explosion-proof valve 40 to a certain extent.

[0047] Furthermore, a plurality of reinforcing ribs 122 are provided in the first pressure relief chamber 12. The plurality of reinforcing ribs 122 are spaced apart along the width direction b of the lower plastic body. The plurality of reinforcing ribs 122 divide the first pressure relief chamber 12 into a plurality of pressure relief units 123. One of the plurality of pressure relief units 123 is provided with the convex portion 11. Each of the pressure relief units 123 is provided with at least one first through hole 14. By providing the reinforcing ribs 122, the plurality of reinforcing ribs 122 are spaced apart along the width direction b of the lower plastic body in the first pressure relief chamber 12, effectively enhancing the structural strength of the first pressure relief chamber 12, thereby preventing the first pressure relief chamber 12 from deforming due to the impact of gas inside the battery when thermal runaway occurs, thereby ensuring that the gas inside the battery can be discharged. At least one first through hole 14 is provided in each pressure relief unit 123 to ensure the ventilation effect of the first pressure relief chamber 12.

[0048] See also Figure 4In some embodiments, the bottom of the first pressure relief chamber 12 protrudes toward the lower surface of the lower plastic body 10 to form a first protrusion 121, and the bottom of the second pressure relief chamber 13 protrudes toward the lower surface of the lower plastic body 10 to form a second protrusion 131. The height of the second protrusion 131 is less than that of the first protrusion 121. The arrangement of the first protrusion 121 and the second protrusion 131 effectively increases the rigidity and stability of the lower plastic body 10, making it less susceptible to deformation or cracking when subjected to pressure. Furthermore, because the height of the second protrusion 131 is less than that of the first protrusion 121, the first protrusion 121 abuts against the upper end surface of the battery cell, effectively limiting the position of the conductive component 30 and preventing short circuits in the battery cell.

[0049] See also Figure 7 In some embodiments, along the length direction a of the lower plastic body, a third protrusion 16 is provided at both ends of the lower plastic body 10. The third protrusion 16 abuts against the upper end surface of the battery cell, effectively limiting the conductive component 30 and preventing the battery cell from short-circuiting.

[0050] See also Figure 1 、 Figures 3-4 、 Figure 9 In some embodiments, the explosion-proof valve 40 includes an explosion-proof disc 41 and a protective disc 42. The cover plate 20 is provided with a pressure relief port 22. Both the explosion-proof disc 41 and the protective disc 42 are disposed at the pressure relief port 22 of the cover plate 20. The protective disc 42 is located above the explosion-proof disc 41, and the protrusion 11 abuts against the middle portion of the lower surface of the explosion-proof disc 41. Through the coordinated use of the explosion-proof disc 41 and the protective disc 42, both of which are disposed at the pressure relief port 22 of the cover plate 20, when the battery experiences thermal runaway, the explosion-proof disc 41 ruptures, and the internal gas of the battery is discharged from the explosion-proof valve 40, thereby preventing the battery from exploding and improving battery safety. The protective disc 42 is disposed above the explosion-proof disc 41 to prevent dust, liquid, or the like from contaminating the explosion-proof disc 41. In addition, the convex portion 11 abuts against the middle of the lower surface of the explosion-proof plate 41, and the explosion-proof plate 41 is supported by the convex portion 11, effectively preventing the explosion-proof valve 40 from arching downward during the cyclic change of external pressure and internal pressure of the battery, thereby improving the fatigue life of the explosion-proof valve 40 to a certain extent.

[0051] See also Figure 9Furthermore, the explosion-proof plate 41 includes a connecting portion 411 and an arc-shaped portion 412. The connecting portion 411 is connected to the circumferential side of the arc-shaped portion 412. A connecting groove is provided on the lower surface of the cover plate 20. The connecting groove surrounds the circumferential side of the pressure relief port 22. The connecting portion 411 is provided in the connecting groove, and the protrusion 11 abuts against the middle of the lower surface of the arc-shaped portion 412.

[0052] Specifically, the arc-shaped portion 412 arches toward the upper surface of the cover plate 20 .

[0053] Furthermore, a weak portion 413 is provided at the connection between the connecting portion 411 and the arc portion 412. When thermal runaway occurs in the battery, the weak portion 413 ruptures, and the gas inside the battery is discharged from the explosion-proof valve 40, thereby preventing the battery from exploding and improving the safety of the battery.

[0054] See also Figures 1 to 3 、 Figure 5 In some embodiments, the conductive component 30 includes a first conductive member 31, a second conductive member 32, an upper plastic 33 and an insulating seal 34. The upper plastic 33 and the first conductive member 31 are sequentially arranged on the upper surface of the cover 20. The upper plastic 33 and the first conductive member 31 both correspond to the positions of the first mounting hole 21. The second conductive member 32 is arranged on the lower surface of the lower plastic 10 body. Part of the second conductive member 32 passes through the second mounting hole 17, the first mounting hole 21 and the upper plastic 33 and is connected to the first conductive member 31. The insulating seal 34 is arranged between the cover 20 and the second conductive member 32. The coordinated use of the first conductive member 31, the second conductive member 32, the upper plastic 33, and the insulating seal 34—the upper plastic 33 disposed between the first conductive member 31 and the cover plate 20, the lower plastic 10 disposed between the second conductive member 32 and the cover plate 20, and the insulating seal 34 disposed between the second conductive member 32 and the cover plate 20—effectively prevents the first and second conductive members 31, 32 from contacting the cover plate 20 and causing a battery short circuit. The first conductive member 31 is used to electrically connect to an external circuit, while the second conductive member 32 is used to electrically connect to the adapter or the tab of the battery cell. A portion of the second conductive member 32 passes through the first mounting hole 21, the second mounting hole 17, and the upper plastic 33 to electrically connect to the first conductive member 31, ensuring the battery's electrical connection.

[0055] Furthermore, two conductive components 30 are provided, the polarities of the two conductive components 30 are opposite, and the two conductive components 30 are arranged in parallel on the top cover component 100 .

[0056] Specifically, one of the two conductive components 30 is a positive electrode column, and the other of the two conductive components 30 is a negative electrode column.

[0057] See also Figures 1 to 3 、 Figure 6 、 Figure 8In some embodiments, the cover plate 20 is provided with an injection hole 23, the lower plastic 10 is provided with a second through hole 15 corresponding to the injection hole 23, a sealing member 50 is provided in the injection hole 23, and the cover plate 20 is provided with a groove 24, which is arranged around the injection hole 23. Through the provision of the injection hole 23 and the second through hole 15, the electrolyte can enter the interior of the battery through the injection hole 23 and the second through hole 15. The sealing member 50 is used to seal the injection hole 23 to prevent the electrolyte inside the battery from leaking from the injection hole 23. By providing the groove 24 on the cover plate 20 and surrounding the injection hole 23, the groove 24 can largely offset the stress of the sealing member 50 during the welding process, thereby reducing the risk of welding cracks caused by excessive stress during the welding process.

[0058] Furthermore, the distance L between the groove 24 and the injection hole 23 is greater than or equal to 0.5 mm. By setting the distance L between the groove 24 and the injection hole 23 to be greater than or equal to 0.5 mm, the groove 24 can offset the stress during the welding process of the seal 50.

[0059] Furthermore, the depth of the groove 24 is greater than or equal to 0.5 mm.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A lower plastic, characterized in that: It comprises a lower plastic body, on which a convex portion (11) is arranged, and the convex portion (11) is used to abut against the middle portion of the lower surface of the explosion-proof valve (40).

2. The lower plastic as claimed in claim 1, characterized in that: Along the length direction a of the lower plastic body, a first pressure relief chamber (12) and a second pressure relief chamber (13) are provided on the lower plastic body, the second pressure relief chamber (13) is located on at least one side of the first pressure relief chamber (12) and is connected to the first pressure relief chamber (12), the first pressure relief chamber (12) and the second pressure relief chamber (13) are both provided with a first through hole (14), and the convex portion (11) is provided in the first pressure relief chamber (12).

3. The lower plastic as claimed in claim 2, characterized in that: The bottom of the first pressure relief chamber (12) protrudes toward the lower surface of the lower plastic body to form a first protrusion (121), and the bottom of the second pressure relief chamber (13) protrudes toward the lower surface of the lower plastic body to form a second protrusion (131), and the height of the second protrusion (131) is less than the height of the first protrusion (121).

4. A top cover assembly, characterized in that: The invention comprises a cover plate (20), a conductive component (30), an explosion-proof valve (40) and a lower plastic as claimed in any one of claims 1 to 3, wherein the lower plastic (10) is arranged on the lower surface of the cover plate (20), the cover plate (20) is provided with a first mounting hole (21), the lower plastic (10) is provided with a second mounting hole (17) corresponding to the first mounting hole (21), the conductive component (30) passes through the first mounting hole (21) and the second mounting hole (17), the explosion-proof valve (40) is arranged on the cover plate (20), and the protrusion (11) abuts against the middle part of the lower surface of the explosion-proof valve (40).

5. The top cover assembly according to claim 4, characterized in that: The explosion-proof valve (40) comprises an explosion-proof disc (41) and a protective disc (42); a pressure relief port (22) is provided on the cover plate (20); the explosion-proof disc (41) and the protective disc (42) are both provided at the pressure relief port (22) of the cover plate (20); the protective disc (42) is located above the explosion-proof disc (41); and the convex portion (11) abuts against the middle portion of the lower surface of the explosion-proof disc (41).

6. The top cover assembly according to claim 4, characterized in that: The conductive component (30) comprises a first conductive member (31), a second conductive member (32), an upper plastic (33) and an insulating seal (34); the upper plastic (33) and the first conductive member (31) are sequentially arranged on the upper surface of the cover plate (20); the upper plastic (33) and the first conductive member (31) both correspond to the positions of the first mounting hole (21); the second conductive member (32) is arranged on the lower surface of the lower plastic body; a portion of the second conductive member (32) passes through the second mounting hole (17), the first mounting hole (21) and the upper plastic (33) to be connected to the first conductive member (31); and the insulating seal (34) is arranged between the cover plate (20) and the second conductive member (32).

7. The top cover assembly according to claim 4, characterized in that: The cover plate (20) is provided with a liquid injection hole (23), the lower plastic (10) is provided with a second through hole (15) corresponding to the liquid injection hole (23), a sealing member (50) is provided in the liquid injection hole (23), and the cover plate (20) is provided with a groove (24), and the groove (24) is arranged around the liquid injection hole (23).

8. The top cover assembly according to claim 7, wherein: The distance (L) between the groove (24) and the liquid injection hole (23) is greater than or equal to 0.5 mm.

9. A battery, characterized in that: A top cover assembly comprising any one of claims 4 to 8.

10. An electrical equipment, characterized in that: A battery comprising the battery of claim 9.

Images