Sealing member, battery cell, battery and electric device

Abstract

The utility model discloses a sealing element, which is used for blocking a battery liquid injection hole and comprises a first part, a second part and a third part which are sequentially connected along the axial direction of the sealing element, the first part and the second part are detachably connected; in the axial projection, the area of the outer contour of the first part is larger than that of the outer contour of the second part, and the area of the outer contour of the third part is larger than that of the outer contour of the second part; the peripheral surfaces of the first part and the second part are connected with the hole wall of the liquid injection hole, and at least part of the peripheral surface of the third part is in interference connection with the hole wall of the liquid injection hole. Therefore, the third part of the sealing element is in interference connection with the hole wall of the liquid injection hole, so that the sealing element can be prevented from popping up; and the second part is connected with the hole wall of the liquid injection hole, and the second part is subjected to annular clamping force from the hole wall of the liquid injection hole, so that the sealing element can be prevented from falling into the battery cell. And moreover, the first part and the second part are detachably connected, so that the problems that welding is not in place under the welding condition and the like can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a seal, a battery cell, a battery and an electrical device. Background Art

[0002] Under the dual pressures of energy crisis and environmental pollution, the electrification of the automotive power system has gradually become the mainstream of future automotive technology development. Lithium-ion batteries are one of the main choices for the power source of electric vehicles due to their advantages in energy density and cycle life. However, safety accidents of lithium-ion power batteries occur occasionally, and the safety issues of lithium-ion power batteries have become one of the problems threatening the life and property safety of the people and hindering the large-scale industrialization of electric vehicles. One of the safety issues is that after the battery is filled with liquid, it is usually necessary to use a sealing nail to block the liquid injection hole and weld the sealing nail to the end cover. During the welding process, there may be incomplete welding, which affects the sealing performance of the battery and thus affects the safety of the battery during use. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a seal, a battery cell, a battery and an electrical device, which can solve the problem that incomplete welding of the sealing nail and the end cover affects the sealing performance of the battery and thus affects the safety of the battery during use.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A seal for blocking a battery liquid injection hole, the seal includes a first part, a second part and a third part connected in sequence along its axial direction;

[0006] The first part and the second part are detachably connected;

[0007] In the projection along the axial direction, the area of the outer contour of the first part is larger than the area of the outer contour of the second part, and the area of the outer contour of the third part is larger than the area of the outer contour of the second part;

[0008] The outer peripheral surfaces of the first part and the second part are connected to the hole wall of the liquid injection hole, and at least part of the outer peripheral surface of the third part is in interference connection with the hole wall of the liquid injection hole.

[0009] Optionally, in the above seal, the third part includes:

[0010] An outwardly inclined part, which includes a first end and a second end along the axial direction, the first end is connected to the second part; in the projection along the axial direction, the area of the outer contour of the second end is larger than the area of the outer contour of the first end;

[0011] An inwardly inclined portion, with the first end of the inwardly inclined portion connected to the second end; in a projection along the axial direction, the outer contour area of the first end of the inwardly inclined portion is larger than the outer contour area of the free end of the inwardly inclined portion;

[0012] Wherein, cavities are provided inside the outwardly inclined portion and the inwardly inclined portion;

[0013] The inwardly inclined portion is arranged in segments along the circumferential direction.

[0014] Optionally, in the above-mentioned seal, in a cross-section along the axial direction, the included angle between the connection line of the first end and the second end of the outwardly inclined portion and the first direction is α, 0° < α ≤ 45°;

[0015] And / or, in a cross-section along the axial direction, the included angle between the connection line of the first end and the free end of the inwardly inclined portion and the first direction is β, 45° ≤ β < 90°;

[0016] The axial direction is perpendicular to the first direction.

[0017] Optionally, in the above-mentioned seal, the thickness of the outwardly inclined portion is L1, and the thickness of the inwardly inclined portion is L2, L2 > L1.

[0018] A battery cell includes the above-mentioned seal and a plate body;

[0019] A plurality of the plate bodies enclose a housing having an accommodation space, and at least one of the plate bodies is provided with a liquid injection hole. Along the thickness direction of the plate body provided with the liquid injection hole, the liquid injection hole includes a first hole section and a second hole section that are communicated; in a projection along the thickness, the inner wall area of the second hole section is larger than the inner wall area of the first hole section;

[0020] The first part and the second part of the seal are accommodated in the first hole section; the hole wall of the first hole section abuts against the outer wall of the second part; the hole wall of the second hole section abuts against the outer wall of the third part;

[0021] The thickness direction is parallel to the axial direction.

[0022] Optionally, in the above-mentioned battery cell, the included angle between the connection line of the two ends of the second hole section along the thickness direction and the plane of the plate body provided with the liquid injection hole is γ, γ = α.

[0023] Optionally, in the above-mentioned battery cell, the first hole section is a stepped hole, and along the thickness direction, the first hole section includes a first sub-hole and a second sub-hole;

[0024] Wherein:

[0025] The diameter of the second sub-hole is D, and the outer diameter of the free end of the third part is D1, where D1 ≤ D;

[0026] And / or, in the projection along the thickness direction, the inner wall area of the first sub-hole is larger than the inner wall area of the second sub-hole; along the thickness direction, an elastic part is provided between the step surface of the first sub-hole and the second sub-hole and the first part.

[0027] Optionally, in the above battery cell, the diameter of the second part is D2, where D2 > D.

[0028] Optionally, in the above battery cell, a first limiting member is provided on the end face of the first part close to the second part;

[0029] A second limiting member is provided on the end face of the second part close to the first part;

[0030] The first limiting member and the second limiting member are detachably connected.

[0031] A battery includes the above battery cell.

[0032] An electrical device includes the above battery.

[0033] It can be seen from the above technical solutions that the third part of the present invention is in interference connection with the hole wall of the liquid injection hole, which can prevent the sealing member from popping out; and the second part is connected to the hole wall of the liquid injection hole, and the second part is subjected to the circumferential clamping force from the hole wall of the liquid injection hole, which can prevent the sealing member from falling into the battery core. Moreover, the first part and the second part are detachably connected, which can avoid problems such as incomplete welding in the case of welding. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0035] Figure 1 It is a sectional view of the plate body provided by the embodiment of the present invention;

[0036] Figure 2 It is Figure 1 a partial enlarged view of;

[0037] Figure 3 It is a sectional view of the liquid injection hole provided by the embodiment of the present invention;

[0038] Figure 4The cross-sectional view of the seal provided by the embodiment of the present utility model;

[0039] Figure 5 is Figure 4 a partially enlarged view;

[0040] Figure 6 The structural schematic diagram of the seal provided by the embodiment of the present utility model.

[0041] Wherein:

[0042] 1. Plate body;

[0043] 2. Liquid injection hole;

[0044] 21. First hole section; 211. First sub-hole; 212. Second sub-hole; 22. Second hole section;

[0045] 31. First part; 32. Second part;

[0046] 33. Third part; 331. Outward inclined part; 332. Inward inclined part; 34. Elastic part. Specific embodiments

[0047] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0048] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] As Figures 1 to 6 shown, the embodiment of the present utility model provides a seal, which can solve the problem that the unsealed welding of the sealing nail and the end cover affects the sealing performance of the battery, thereby affecting the safety of the battery during use.

[0050] First, the seal is used to block the battery liquid injection hole 2. The seal includes a first part 31, a second part 32, and a third part 33 connected in sequence along its axial direction. The first part 31 and the second part 32 are detachably connected. In the projection along the axial direction, the area of the outer contour of the first part 31 is larger than the area of the outer contour of the second part 32, and the area of the outer contour of the third part 33 is larger than the area of the outer contour of the second part 32. The outer peripheral surfaces of the first part 31 and the second part 32 are connected to the hole wall of the liquid injection hole 2, and at least part of the outer peripheral surface of the third part 33 is in interference connection with the hole wall of the liquid injection hole 2. Exemplarily, the diameter of the battery liquid injection hole 2 is 3 mm, and the diameter of the second part 32 is 3.15 mm. The third part 33 and the second part 32 are made of elastic insulating materials, and the elastic insulating materials include but are not limited to rubber-like materials. Those skilled in the art can make specific designs according to actual needs for the diameter of the battery liquid injection hole 2, the diameter of the second part 32, and the material types of the second part 32 and the third part 33.

[0051] It can be seen that the third part 33 of the seal provided by the embodiment of the present invention is in interference connection with the hole wall of the liquid injection hole 2, which can prevent the seal from popping out. Moreover, the second part 32 is connected to the hole wall of the liquid injection hole 2, and the second part 32 is subjected to a circumferential clamping force from the hole wall of the liquid injection hole 2, which can prevent the seal from falling into the battery cell. In addition, the first part 31 and the second part 32 are detachably connected, which can avoid problems such as incomplete welding in the case of welding.

[0052] Specifically in implementation, the third part 33 includes: an outwardly inclined part 331, which includes a first end and a second end along the axial direction, and the first end is connected to the second part 32. In the projection along the axial direction, the area of the outer contour of the second end is larger than the area of the outer contour of the first end. An inwardly inclined part 332, the first end of the inwardly inclined part 332 is connected to the second end. In the projection along the axial direction, the area of the outer contour of the first end of the inwardly inclined part 332 is larger than the area of the outer contour of the free end of the inwardly inclined part 332. Wherein, a cavity is provided inside the outwardly inclined part 331 and the inwardly inclined part 332. The inwardly inclined part 332 is arranged in segments along the circumferential direction. When the seal is inserted into the liquid injection hole 2, as the insertion depth increases, the third part 33 of the seal will be squeezed by the liquid injection hole 2, resulting in the compression deformation of the third part 33. Due to the cavity provided inside the third part 33, the outwardly inclined part 331 and the inwardly inclined part 332 of the third part 33 are more likely to deform, which is convenient for the installation of the seal. At the same time, because the inwardly inclined part 332 is arranged in segments, the installation of the seal is more convenient. It should be noted that the inwardly inclined part 332 is evenly divided into 4 segments along the circumferential direction, but it is not limited thereto. Those skilled in the art can make specific designs according to actual needs for the specific form and quantity of the segments of the inwardly inclined part 332.

[0053] In specific implementation, on the axial cross-section, the included angle between the line connecting the first end and the second end of the outward inclined portion 331 and the first direction is α, where 0° < α ≤ 45°. Due to the existence of the angle α, when the installed sealant exits outward, there is a relatively large resistance and it is not easy to exit; and / or, on the axial cross-section, the included angle between the line connecting the first end and the free end of the inward inclined portion 332 and the first direction is β, where 45° ≤ β < 90°; the axis is perpendicular to the first direction. It should be noted that α is preferably 30°, and β is preferably 60°, but it is not limited thereto. Those skilled in the art can specifically design the specific angles of α and β according to actual needs.

[0054] In specific implementation, the thickness of the outward inclined portion 331 is L1, and the thickness of the inward inclined portion 332 is L2, where L2 > L1, making the outward inclined portion 331 more likely to deform. During the process of installing the sealant into the liquid injection hole 2, the inward inclined portion 332 deforms and rotates along with the outward inclined portion 331. The size of the sealant at the contact position with the liquid injection hole 2 decreases, and the sealant moves inward to the inner side of the liquid injection hole 2 until the maximum position of the third portion 33 passes through the liquid injection hole 2, and the third portion 33 of the sealant rebounds and hangs on the bottom of the liquid injection hole 2. Exemplarily, L1 is 0.15 mm and L2 is 0.3 mm, but it is not limited thereto. Those skilled in the art can specifically design the specific dimensions of L1 and L2 according to actual needs.

[0055] An embodiment of the present utility model provides a battery cell, including the above-mentioned sealant and the plate body 1; a plurality of plate bodies 1 enclose a housing with an accommodation space, and at least one plate body 1 is provided with a liquid injection hole 2. Along the thickness direction of the plate body 1 provided with the liquid injection hole 2, the liquid injection hole 2 includes a first hole section 21 and a second hole section 22 that are communicated; along the projection of the thickness, the area of the inner wall of the second hole section 22 is larger than the area of the inner wall of the first hole section 21; the first portion 31 and the second portion 32 of the sealant are accommodated in the first hole section 21; the hole wall of the first hole section 21 abuts against the outer wall of the second portion 32; the hole wall of the second hole section 22 abuts against the outer wall of the third portion 33; the thickness direction is parallel to the axial direction.

[0056] It can be seen that the outer wall of the third portion 33 of the sealant in the battery cell provided by the embodiment of the present utility model abuts against the hole wall of the second hole section 22 of the liquid injection hole 2, and the hole wall of the first hole section 21 abuts against the outer wall of the second portion 32; the third portion 33 and the second portion 32 are subjected to a circumferential clamping force from the hole wall of the liquid injection hole 2, which can prevent the sealant from falling into the battery core. Moreover, the first portion 31 and the second portion 32 are detachably connected, which can avoid problems such as incomplete welding in the case of welding.

[0057] During specific implementation, the included angle between the connection line at both ends of the second hole section 22 in the thickness direction and the plane of the plate body 1 provided with the liquid injection hole 2 is γ, and γ = α. After the seal enters the liquid injection hole 2, the outward inclined portion 331 of the third part 33 can be attached to the bottom inclined surface of the liquid injection hole 2, increasing the contact area and the friction force, preventing the seal from coming out, with uniform force and better sealing effect of the seal. It should be noted that γ is preferably 30°, but not limited thereto. Those skilled in the art can specifically design the specific angle of γ according to actual needs.

[0058] During specific implementation, the first hole section 21 is a stepped hole. In the thickness direction, the first hole section 21 includes a first sub-hole 211 and a second sub-hole 212; wherein: the diameter of the second sub-hole 212 is D, and the outer diameter of the free end of the third part 33 is D1, and D1 ≤ D, which is convenient for the free end (i.e., the head) to smoothly pass through the second sub-hole 212 during the installation process of the third part 33, playing a role in positioning the seal first, and facilitating the application of an external force to the seal during the process of the seal continuing to penetrate into the liquid injection hole 2 to complete the interference connection between the seal and the liquid injection hole 2; and / or, in the projection in the thickness direction, the inner wall area of the first sub-hole 211 is larger than the inner wall area of the second sub-hole 212; in the thickness direction, an elastic part 34 is provided between the step surface of the first sub-hole 211 and the second sub-hole 212 and the first part 31. The connection position of the first part 31 and the second part 32 is clamped to the step surface, further playing a role in preventing the seal from falling into the battery cell. Exemplarily, D1 is 2.9 mm, but not limited thereto. Those skilled in the art can specifically design the specific size of D1 according to actual needs.

[0059] During specific implementation, the diameter of the second part 32 is D2, and D2 > D. The downward force is generated by the extrusion of the outward inclined portion 331 of the third part 33 and the second hole section 22 of the liquid injection hole 2, causing the first part 31 to compress the elastic part 34 for sealing in the elastic part 34. At the same time, D2 > D can also achieve a secondary sealing effect. The third part 33 can be inserted into the liquid injection hole 2. The third part 33 has a large inclination angle and is hollow and deformed. The third part 33 squeezed by the liquid injection hole 2 shrinks and enters the liquid injection hole 2. After passing through the maximum diameter, the outward inclined portion 331 of the third part 33 fits with the inclined angle of the second hole section 22 of the liquid injection hole 2. Due to the small angle, the friction force is large, making it difficult for the third part 33 to withdraw.

[0060] In specific implementation, a first limiting member is provided on the end face of the first part 31 close to the second part 32; a second limiting member is provided on the end face of the second part 32 close to the first part 31; the first limiting member and the second limiting member are detachably connected. The first limiting member is a concave pit provided on the lower surface of the first part 31, and the second limiting member is a protrusion provided on the second part 32. The protrusion of the second part 32 is embedded in the concave pit of the first part 31; alternatively, the first limiting member is a protrusion provided on the lower surface of the first part 31, and the second limiting member is a concave pit provided on the second part 32. The protrusion of the first part 31 is embedded in the concave pit of the second part 32. However, it is not limited thereto. Those skilled in the art can specifically design the specific structures of the first limiting member and the second limiting member according to actual needs.

[0061] In specific implementation, when liquid needs to be replenished, since the first part 31 and the second part 32 are detachably connected, the first part 31 can be removed to disconnect the first part 31, the second part 32 and the third part 33. The second part 32 and the third part 33 are made of insulating materials and can fall into the battery interior. After the liquid replenishment is completed, a new seal is used for sealing.

[0062] An embodiment of the present invention provides a battery, including the above battery cell.

[0063] It can be seen that the third part 33 of the seal in the battery provided by the embodiment of the present invention is in interference connection with the hole wall of the liquid injection hole 2, which can prevent the seal from popping out; and the second part 32 is connected to the hole wall of the liquid injection hole 2, and the second part 32 is subjected to a circumferential clamping force from the hole wall of the liquid injection hole 2, which can prevent the seal from falling into the battery cell. Moreover, the first part 31 and the second part 32 are detachably connected, which can avoid problems such as incomplete welding in the case of welding.

[0064] An embodiment of the present invention provides an electrical device, including the above battery.

[0065] The electrical device of the present invention is not particularly limited, and it may include but is not limited to: laptop computers, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, liquid crystal televisions, hand-held cleaners, portable CD players, mini discs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, motorized bicycles, bicycles, lighting appliances, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0066] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0067] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference may be made to each other.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seal for plugging a battery liquid injection hole (2), characterized in that The seal includes a first part (31), a second part (32), and a third part (33) connected in sequence along its axial direction; The first part (31) and the second part (32) are detachably connected; In the projection along the axial direction, the area of the outer contour of the first part (31) is larger than the area of the outer contour of the second part (32), and the area of the outer contour of the third part (33) is larger than the area of the outer contour of the second part (32); The outer peripheral surfaces of the first part (31) and the second part (32) are connected to the hole wall of the liquid injection hole (2), and at least a part of the outer peripheral surface of the third part (33) is in interference connection with the hole wall of the liquid injection hole (2).

2. The seal according to claim 1, characterized in that, The third part (33) includes: An outward inclined part (331) that includes a first end and a second end along the axial direction, and the first end is connected to the second part (32); in the projection along the axial direction, the area of the outer contour of the second end is larger than the area of the outer contour of the first end; An inward inclined part (332), and the first end of the inward inclined part (332) is connected to the second end; in the projection along the axial direction, the area of the outer contour of the first end of the inward inclined part (332) is larger than the area of the outer contour of the free end of the inward inclined part (332); Wherein, a cavity is provided inside the outward inclined part (331) and the inward inclined part (332); The inward inclined part (332) is arranged in segments along the circumferential direction.

3. The seal according to claim 2, wherein In the cross-section along the axial direction, the included angle between the connection line of the first end and the second end of the outward inclined part (331) and the first direction is α, 0° < α ≤ 45°; And / or, in the cross-section along the axial direction, the included angle between the connection line of the first end and the free end of the inward inclined part (332) and the first direction is β, 45° ≤ β < 90°; The axial direction is perpendicular to the first direction.

4. The seal according to claim 2, characterized in that, The thickness of the outward inclined part (331) is L1, and the thickness of the inward inclined part (332) is L2, and L2 > L1.

5. A battery cell, characterized in that, It includes the seal according to any one of claims 1-4 and a plate body (1); A plurality of the plate bodies (1) enclose a housing with an accommodation space, and at least one of the plate bodies (1) is provided with a liquid injection hole (2). Along the thickness direction of the plate body (1) provided with the liquid injection hole (2), the liquid injection hole (2) includes a first hole section (21) and a second hole section (22) that are communicated; in the projection along the thickness, the area of the inner wall of the second hole section (22) is larger than the area of the inner wall of the first hole section (21); The first part (31) and the second part (32) of the seal are accommodated in the first hole section (21); the hole wall of the first hole section (21) abuts against the outer wall of the second part (32); the hole wall of the second hole section (22) abuts against the outer wall of the third part (33); The thickness direction is parallel to the axial direction.

6. The battery cell according to claim 5, wherein The included angle between the connection line of the two ends of the second hole section (22) along the thickness direction and the plane of the plate body (1) provided with the liquid injection hole (2) is γ, and γ = α.

7. The battery cell according to claim 5, characterized in that, The first hole section (21) is a stepped hole. Along the thickness direction, the first hole section (21) includes a first sub-hole (211) and a second sub-hole (212). Wherein: The diameter of the second sub-hole (212) is D, and the outer diameter of the free end of the third part (33) is D1, and D1 ≤ D. And / or, in the projection along the thickness direction, the inner wall area of the first sub-hole (211) is larger than the inner wall area of the second sub-hole (212); along the thickness direction, an elastic part (34) is arranged between the stepped surface of the first sub-hole (211) and the second sub-hole (212) and the first part (31).

8. The battery cell according to claim 5, wherein The diameter of the second part (32) is D2, and D2 > D.

9. The battery cell according to claim 5, wherein A first limiting member is arranged on the end surface of the first part (31) close to the second part (32); A second limiting member is arranged on the end surface of the second part (32) close to the first part (31); The first limiting member and the second limiting member are detachably connected.

10. A battery, characterized in that, It includes the battery cell according to any one of claims 5-9.

11. An electrical device, characterized in that, It includes the battery according to claim 10.

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