Cover plate assembly and battery

Abstract

The utility model discloses a cover plate assembly and a battery, which relates to the technical field of batteries, and comprises a cover plate, an inner insulating part and an inner lead-out plate which are sequentially arranged along the axial direction, the terminal post is arranged on the cover plate in a penetrating manner; the first sealing ring is arranged between the terminal post and the inner insulating part in a sleeving manner; the outer insulating part is arranged between the terminal post and the cover plate in a sleeving manner; and the second sealing ring is arranged between the terminal post and the outer insulating part in a sleeving manner. According to the embodiment of the utility model, the first sealing ring and the second sealing ring are matched with each other, so that the sealing performance of the pole on the cover plate can be effectively improved, and the sealing structure is not only suitable for the sealing connection of the positive pole and the cover plate, but also suitable for the sealing connection of the negative pole and the cover plate; the cover plate is particularly suitable for being used in a copper-aluminum composite negative pole, and water vapor impurities and the like outside the cover plate can be prevented from entering a copper-aluminum composite bonding layer through an assembly path to corrode the negative pole.

Description

Technical Field

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

[0002] The cover assembly of the battery includes an insulating member, a cover and a pole. Since the cover and the pole are made of metal, in order to ensure electrical insulation between the cover and the pole, an insulating member needs to be added between the cover and the pole and used for insulation of the cover and the pole. Currently, commonly used insulating members are usually plastic insulating members, such as PBS material, PP material, etc. Plastic insulating members have a certain hardness and limited deformation capacity, so that the insulating member cannot be tightly attached to the cover or the pole, so that external liquid can easily flow into the battery from the gap between the insulating member and the cover, and between the insulating member and the pole.

[0003] In the cover plate assembly in the prior art, liquid can easily flow in and out between the insulating member and the cover plate, and between the insulating member and the pole, resulting in poor sealing effect. Summary of the invention

[0004] The embodiments of the utility model provide a cover plate assembly and a battery to solve the problem of poor sealing effect of the existing cover plate assembly.

[0005] On the one hand, an embodiment of the utility model provides a cover plate assembly, including a cover plate, an inner insulating member and an inner lead-out plate arranged in sequence along the axial direction, and also including a pole passing through the cover plate, a first sealing ring sleeved between the pole and the inner insulating member, an outer insulating member sleeved between the pole and the cover plate, and a second sealing ring sleeved between the pole and the outer insulating member, the cover plate is provided with a first through hole extending through its thickness, and the pole and the outer insulating member are inserted in the first through hole.

[0006] Optionally, the pole comprises a first section, a second section, a third section and a fourth section which are sequentially connected along the axial direction;

[0007] The cross-sectional width of the second section of the pole is greater than the cross-sectional width of the third section, so that a first stepped groove for fixing the first sealing ring is formed between the second section and the third section of the pole, and the first stepped groove has a first mounting surface and a second mounting surface connected to each other;

[0008] The first sealing ring has a first abutting surface and a second abutting surface arranged opposite to each other along the axial direction, the first abutting surface is tightly fitted with the cover plate, the outer insulating member and the first mounting surface of the first stepped groove, and the second abutting surface is tightly fitted with the inner lead-out plate.

[0009] Optionally, the outer insulating member is sleeved between the first section and the second section of the pole, and the outer insulating member includes a first cylinder sleeved on the outside of the first section of the pole, a second cylinder sleeved on the outside of the second section of the pole, and an annular connecting piece connecting the first cylinder and the second cylinder.

[0010] Optionally, the cross-sectional width of the first section of the pole is greater than the cross-sectional width of the second section, so that a second step groove is formed between the first section and the second section of the pole; the second step groove includes a first horizontal plane located in the first section; and the second sealing ring is located between the first horizontal plane of the pole and the annular connecting plate of the external insulating member.

[0011] Optionally, a first groove for accommodating the second sealing ring is provided on the first horizontal plane of the pole and / or a second groove for accommodating the second sealing ring is provided on the annular connecting plate of the outer insulating member, and the second sealing ring is clamped in the first groove and / or the second groove.

[0012] Optionally, when the first groove is provided on the pole and the second groove is provided on the outer insulating member, the depth of the first groove is h1, the depth of the second groove is h2, the thickness of the second sealing ring after compression is h3, and the thickness of the second sealing ring after compression h3 is the sum of the depth h1 of the first groove and the depth h2 of the second groove.

[0013] Optionally, a second through hole penetrating along the thickness direction of the inner lead plate is provided in the middle portion thereof, and the fourth section of the pole is inserted into the second through hole and fixed to the inner lead plate by welding.

[0014] Optionally, the thickness of the inner insulating member is a, the thickness of the first sealing ring after compression is b, and the thickness b of the first sealing ring after compression is the same as the thickness a of the inner insulating member.

[0015] Optionally, the compression amounts of the first sealing ring and the second sealing ring are both 5%-45%.

[0016] On the other hand, an embodiment of the present invention further provides a battery, comprising the above-mentioned cover plate assembly.

[0017] The embodiment of the utility model can effectively improve the sealing performance of the pole on the cover plate through the mutual cooperation of the first sealing ring and the second sealing ring, and is not only suitable for use in the sealing connection between the positive pole and the cover plate, but also suitable for use in the sealing connection between the negative pole and the cover plate, especially suitable for use in the negative pole whose pole material is copper-aluminum composite, and can prevent water vapor impurities outside the cover plate from entering the copper-aluminum composite bonding layer through the assembly path to corrode the negative pole;

[0018] A portion of the first sealing ring is installed in the gap between the cover plate and the inner lead plate, and another portion is installed in the annular stepped groove, so that the first sealing ring as a whole can strengthen the sealing of the pole and the cover plate;

[0019] Due to the presence of the annular stepped groove, compared with only providing the first sealing ring between the cover plate and the inner end surface of the pole, the present embodiment increases the sealing area and extends the sealing path, thereby achieving a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the first embodiment of the present invention;

[0022] Figure 2 is an exploded view of the overall structure of the first embodiment of the present invention;

[0023] Figure 3 is a cross-sectional view of the overall structure at the pole in the first embodiment of the present invention;

[0024] Figure 4 is a cross-sectional view of a pole in a first embodiment of the present invention;

[0025] Figure 5 is a three-dimensional schematic diagram of a first sealing ring in a first embodiment of the present invention;

[0026] Figure 6 2 is a three-dimensional schematic diagram of an outer insulating member in the first embodiment of the present invention.

[0027] Figure numerals: 100, cover plate assembly; 1, cover plate; 11, first through hole; 2, inner insulating member; 3, inner lead plate; 31, second through hole; 4, pole; 41, first section; 42, second section; 43, third section; 44, fourth section; 45, first stepped groove; 451, first mounting surface; 452, second mounting surface; 46, second stepped groove; 461, first horizontal plane; 4611, first groove; 5, first sealing ring; 51, first abutting surface; 52, second abutting surface; 53, first annular face; 54, second annular face; 6, outer insulating member; 61, first cylinder; 62, second cylinder; 63, annular connecting piece; 631, second groove; 7, second sealing ring. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] First embodiment

[0032] like Figures 1 to 6 As shown, this embodiment discloses a cover plate assembly 100, comprising a cover plate 1, an inner insulating member 2 and an inner lead-out plate 3 arranged in sequence along the axial direction, wherein the cover plate 1, the inner insulating member 2 and the inner lead-out plate 3 are stacked, and the cover plate assembly 100 also includes a pole 4 inserted through the cover plate 1, a first sealing ring 5 sleeved between the pole 4 and the inner insulating member 2, an outer insulating member 6 sleeved between the pole 4 and the cover plate 1, and a second sealing ring 7 sleeved between the pole 4 and the outer insulating member 6, and the cover plate 1 is provided with a first through hole 11 extending through the thickness thereof, and the pole 4 and the outer insulating member 6 are inserted in the first through hole 11. The cover plate assembly 100 provided by the utility model is provided with a first sealing ring 5 and a second sealing ring 7 on the outside of the pole 4. Compared with the existing pole sealing structure, the setting of the two sealing rings can better improve the sealing performance of the pole 4 and the cover plate 1 after assembly, and can maintain the service life of the sealing ring, thereby improving the service life of the cover plate assembly 100 and reducing the requirements for the operating conditions of the cover plate assembly 100, so that the cover plate assembly 100 can be used in various complex working conditions.

[0033] In this embodiment, the pole 4 is insulated and protected by the inner insulating member 2 and the outer insulating member 6, and a first sealing ring 5 and a second sealing ring 7 are provided between the pole 4 and the cover plate 1. The first sealing ring 5 and the second sealing ring 7 not only seal the pole 4 and the cover plate 1, but also seal the inner insulating member 2 and the outer insulating member 6, so that the inner and outer sides of the cover plate assembly 100 are isolated. Compared with the prior art, the first sealing ring 5 and the second sealing ring 7 both have the effects of insulation and sealing.

[0034] Reference Figure 3 and Figure 4 In this embodiment, the pole 4 includes a first section 41, a second section 42, a third section 43 and a fourth section 44 connected in sequence along the axial direction. In this embodiment, the pole 4 is a positive pole, that is, the first section 41, the second section 42, the third section 43 and the fourth section 44 of the pole 4 are all integrally formed of aluminum. Of course, the cover plate assembly 100 provided by the utility model can also be used in a negative pole. When the pole 4 is a negative pole, the first section 41, the second section 42, the third section 43 and the fourth section 44 of the pole 4 are composed of at least two materials, wherein the first section 41 is copper, and the third section 43 and the fourth section 44 are aluminum. According to the requirements of the conductive performance of the negative pole 4, the second section 42 can be copper or aluminum, so that the negative pole is a copper-aluminum composite material. In the cover plate assembly 100 provided by the present invention, the sealing performance of the pole 4 on the cover plate 1 can be effectively improved through the mutual cooperation of the first sealing ring 5 and the second sealing ring 7. It is not only suitable for use in the sealed connection between the positive pole 4 and the cover plate 1, but also suitable for use in the sealed connection between the negative pole 4 and the cover plate 1, especially suitable for use in the negative pole 4 whose pole material is copper-aluminum composite, which can prevent water vapor impurities outside the cover plate 1 from entering the copper-aluminum composite bonding layer through the assembly path to corrode the pole 4.

[0035] like Figure 4 As shown, the cross-sectional width of the second section 42 of the pole 4 in this embodiment is greater than the cross-sectional width of the third section 43, so that a first stepped groove 45 for fixing the first sealing ring 5 is formed between the second section 42 and the third section 43 of the pole 4, and the first stepped groove 45 arranged on the pole 4 is used to cooperate with the cover plate 1 and the inner lead-out plate 3 to achieve the limiting compression of the first sealing ring 5 sleeved on the pole 4, so that the first sealing ring 5 can better achieve the relative sealing between the pole 4 and the cover plate 1, the pole 4 and the outer insulating member 6, and the pole 4 and the inner insulating member 2, thereby ensuring the overall sealing effect of the cover plate 1 at the pole 4.

[0036] The first stepped groove 45 of the pole 4 has a first mounting surface 451 and a second mounting surface 452 connected to each other. The first mounting surface 451 is a horizontal surface, which is used to fit tightly with the top surface of the first sealing ring 5, and the second mounting surface 452 is a vertical surface, which is used to fit tightly with the outer annular surface of the first sealing ring 5, so that the first stepped groove 45 of the pole 4 can limit the two surfaces of the first sealing ring 5, ensuring that the gap between the pole 4 and the outer insulating member 6 can be fully sealed.

[0037] Reference Figure 5 The first sealing ring 5 has a first abutting surface 51 and a second abutting surface 52 which are arranged opposite to each other in the axial direction. The first abutting surface 51 and the second abutting surface 52 of the first sealing ring 5 are both horizontal surfaces. Figure 3 As shown, the first abutting surface 51 and the second abutting surface 52 of the first sealing ring 5 are the main sealing ends. The first abutting surface 51 is tightly fitted with the cover plate 1, the outer insulating member 6 and the first mounting surface 451 of the first stepped groove 45. The upper part of the first abutting surface 51 abuts the cover plate 1, the outer insulating member 6 and the pole 4, so as to prevent water vapor and impurities on the outside of the cover plate 1 from entering the battery through the gap between the cover plate 1 and the outer insulating member 6 or the gap between the outer insulating member 6 and the pole 4. The second abutting surface 52 on the other side of the sealing ring 5 is tightly fitted with the inner lead plate 3. The second abutting surface 52 is completely fitted to the top surface of the inner lead-out plate 3, so that when the first sealing ring 5 is welded and fixedly connected to the inner lead-out plate 3 and the pole 4, the cover plate 1 and the inner lead-out plate 3 squeeze the first sealing ring 5 from the upper and lower sides of the first sealing ring 5 respectively, so that the first sealing ring 5 can only extend from the radial sides under the action of the axial clamping force, so that the two axial end faces of the first sealing ring 5 can be fully fitted to the pole 4 and the inner insulating member 2, thereby achieving radial sealing.

[0038] In this embodiment, the first abutting surface 51 of the first sealing ring 5 abuts against the outer insulating member 6, the cover plate 1 and the first mounting surface 451 of the pole 4 at the same time, thereby providing sealing protection to the outside. Similarly, the second abutting surface 52 of the first sealing ring 5 abuts against the inner insulating member 2 at the same time and is tightly pressed by the cover plate 1 and the inner lead-out plate 3, thereby providing sealing protection to the inner cavity of the battery in actual application.

[0039] In this embodiment, the first section 41, the second section 42, the third section 43 and the fourth section 44 are all in the shape of a column, which is roughly a square column. In other embodiments, the first section 41, the second section 42, the third section 43 and the fourth section 44 may be in the shape of a cylinder. The step groove 45 in this embodiment is formed by the third section 43 being proportionally reduced from the cross section of the second section 42, so that the longitudinal section width of the third section 43 is smaller than the longitudinal section width of the second section 42, and naturally the step groove 45 is formed between the second section 42 and the third section 43.

[0040] Similarly, the second section 42 in this embodiment is formed by proportionally reducing the cross-section of the first section 41, so that the longitudinal section width of the second section 42 is smaller than the longitudinal section width of the first section 41, and the fourth section 44 is formed by proportionally reducing the cross-section of the third section 43, so that the longitudinal section width of the fourth section 44 is smaller than the longitudinal section width of the first section 41.

[0041] In summary, the first section 41, the second section 42, the third section 43 and the fourth section 44 of the pole 4 in this embodiment are proportionally reduced from top to bottom, and the second section 42, the third section 43 and the fourth section 44 are integrally formed. When the pole 4 is a positive pole, the first section 41, the second section 42, the third section 43 and the fourth section 44 of the pole 4 are all made of the same material, generally aluminum. The material of the inner lead plate 3 is also aluminum. When the pole 4 is a negative pole, the first section 41, the second section 42, the third section 43 and the fourth section 44 of the pole 4 are composed of at least two materials, wherein the first section 41 is copper, and the third section 43 and the fourth section 44 are aluminum. According to the requirements of the conductive performance of the negative pole 4, the second section 42 can be copper or aluminum, so that the negative pole is a copper-aluminum composite material, and the composite layer is located between the first sealing ring 5 and the second sealing ring 7, thereby ensuring the mutual cooperation of the first sealing ring 5 and the second sealing ring 7, and fully ensuring that water vapor or impurities on both sides of the cover plate 1 will not enter the composite layer of the negative pole, so as to avoid the substances on both sides of the cover plate 1 entering the composite layer and causing corrosion to the negative pole.

[0042] The first sealing ring 5 has a first annular face 53 and a second annular face 54 which are arranged opposite to each other along the radial direction. When the cover plate 1 and the inner lead plate 3 are not assembled, the first sealing ring 5 is not completely squeezed. At this time, the first annular face 53 and the second annular face 54 of the first sealing ring 5 are not in contact with the components on both sides. That is, when the first sealing ring 5 is not compressed, the first annular face 53 and the second annular face 54 can be vertical faces arranged parallel to the axis, or faces arranged in an arc structure. After the pole 4 and the inner lead plate 3 are fixedly welded, due to the assembly cooperation between the pole 4 and the cover plate 1, the inner lead plate 3 and the cover plate 1 squeeze the first sealing ring 5 on the axial upper and lower surfaces of the first sealing ring 5, so that the first sealing ring 5 extends radially until the axial end face of the first sealing ring 5 is tightly fitted with other components in the cover plate assembly 100. That is, after the first sealing ring 5 is squeezed in the axial direction, the first ring line facing 53 and the second ring line facing 54 of the first sealing ring 5, whether they are vertical facing or arc-shaped facing at the beginning, are both in a substantially vertical facing structure after being squeezed. Among them, the inner ring surface of the first sealing ring 5, that is, the first ring surface 53, fits with the second mounting surface 452 of the first stepped groove 45 of the pole 4, and the outer ring surface of the first sealing ring 5, that is, the second ring line facing, fits with the inner insulating member 2.

[0043] Reference Figure 4 and Figure 6 In this embodiment, the outer insulating member 6 is sleeved between the first section 41 and the second section 42 of the pole 4. The outer insulating member 6 includes a first cylinder 61 sleeved on the outside of the first section 41 of the pole 4, a second cylinder 62 sleeved on the outside of the second section 42 of the pole 4, and an annular connecting piece 63 connecting the first cylinder 61 and the second cylinder 62.

[0044] In this embodiment, the first cylinder 61 and the second cylinder 62 wrap the second section 42 and the first section 41 respectively, and then the end surface of the first section 41 close to the second section 42 is insulated and protected by the annular connecting piece 63, thereby achieving full insulation protection for the first section 41 and the second section 42 and reducing the occurrence of short circuit.

[0045] In this embodiment, the cross-sectional width of the first section 41 of the pole 4 is greater than the cross-sectional width of the second section 42, so that a second stepped groove 46 is formed between the first section 41 and the second section 42 of the pole 4. The second stepped groove 46 of the pole 4 is provided for cooperating with the outer insulating member 6 to limit the position. The second stepped groove 46 includes a first horizontal surface 461 located at the first section 41; the second sealing ring 7 is located between the first horizontal surface 461 of the pole 4 and the annular connecting piece 63 of the outer insulating member 6. The second sealing ring 7 is provided on the horizontal surface between the first section 41 of the pole 4 and the annular connecting piece 63 of the outer insulating member 6. On the one hand, the second sealing ring 7 can be pressed and installed by the close connection between the outer insulating member 6 and the pole 4; on the other hand, it can ensure that the path sealed by the second sealing ring 7 is from the outside of the cover plate 1 along the assembly gap between the outer insulating member 6 and the pole 4, thereby ensuring the sealing performance between the pole 4 and the outer insulating member 6. In this embodiment, the surface of the first section 41 close to the second section 42 (the first horizontal surface 461 ) protrudes from the outer peripheral surface of the second section 42 , thereby forming a stepped groove.

[0046] In this embodiment, a first groove 4611 for accommodating the second sealing ring 7 is provided on the first horizontal surface 461 of the pole 4, and a second groove 631 for accommodating the second sealing ring 7 is provided on the annular connecting plate 63 of the outer insulating member 6. The second sealing ring 7 is clamped in the first groove 4611 and the second groove 631. When the pole 4 of the cover assembly 100 is installed, the outer insulating member 6 is sleeved on the first section 41 and the second section 42 of the pole 4, and the second sealing ring 7 is clamped between the first groove 4611 and the second groove 631. At this time, the outer insulating member 6 and the pole 4 are not tightly fitted, that is, there is a gap between the top surface of the annular connecting piece 63 of the outer insulating member 6 and the first horizontal surface 461 of the first section 41 of the pole 4. When the pole 4 is welded and fixed to the inner lead-out plate 3, the pole 4 presses the outer insulating member 6 downward onto the cover plate 1. At this time, the first section 41 of the pole 4 presses the second sealing ring 7 located in the first groove 4611 downward. After the second sealing ring 7 is squeezed and compressed, the compressed second sealing ring 7 fills the first groove 4611 and the second groove 631, so that the second sealing ring 7 blocks the assembly gap between the outer insulating member 6 and the pole 4.

[0047] The second sealing ring 7 is used to seal and protect the welding position of the first section 41 and the second section 42, reduce the external liquid from flowing into the connection between the first section 41 and the second section 42, and thus reduce the corrosion of the connection by the external liquid. The first sealing ring 5 and the second sealing ring 7 seal the connection between the first section 41 and the second section 42 located therebetween.

[0048] In this embodiment, the first section 41 of the pole 4 is provided with a first groove 4611, the depth of the first groove 4611 is h1, and the outer insulating member 6 is provided with a second groove 631, the depth of the second groove 631 is h2, and the thickness of the second sealing ring 7 after compression is h3, which is the sum of the depth h1 of the first groove 4611 and the depth h2 of the second groove 631. In other words, the second sealing ring 7 completely fills the first groove 4611 and the second groove 631 after being compressed by the first groove 4611 and the second groove 631.

[0049] Of course, in the cover plate assembly 100 provided by the utility model, a first groove 4611 for accommodating the second sealing ring 7 may be provided only on the first section 41 of the pole 4, and the annular connecting piece of the outer insulating member 6 is a horizontal plane. Therefore, when the second sealing ring 7 is pressed, it is completely embedded in the first groove 4611 of the pole 4.

[0050] Alternatively, the first section 41 of the pole 4 is a planar structure, and only the annular connecting piece of the outer insulating member 6 is provided with a second groove 631 for accommodating the second sealing ring 7. Therefore, when the second sealing ring 7 is pressed, it is completely embedded in the second groove 631 of the outer insulating member 6.

[0051] In this embodiment, a second through hole 31 is provided in the middle of the inner lead plate 3 and penetrates along the thickness direction thereof, and the fourth section 44 of the pole 4 is inserted into the second through hole 31 and is welded and fixed to the inner lead plate 3. The cross section of the second through hole 31 matches the cross section of the fourth section 44, that is, on the orthographic projection of the surface of the cover plate 1 away from the first section 41, the cross section edge of the second through hole 31 is located inside the cross section edge of the first through hole 11.

[0052] In this embodiment, the thickness of the inner insulating member 2 is a, and the thickness of the first sealing ring 5 after compression is b. The thickness b of the first sealing ring 5 after compression is the same as the thickness a of the inner insulating member 2. The thickness of the inner insulating member 2 in this embodiment is the thickness of the first sealing ring 5 after compression. In other words, the inner insulating member 2 is generally made of PBS material and is not easily deformed. During the production process, the inner insulating member 2 can ensure that the sealing ring will not be over-compressed, reducing the probability of the first sealing ring losing its sealing due to excessive compression. The thickness of the inner insulating member 2 is used to limit the maximum compression of the first sealing ring 5 in the cover plate assembly 100, thereby ensuring the sealing performance of the first sealing ring 5.

[0053] In this embodiment, the compression amount of the first sealing ring 5 and the second sealing ring 7 are both 5%-45%. The greater the compression amount of the first sealing ring 5 and the second sealing ring 7 in the cover plate assembly 100, the greater the extrusion deformation thereof, the greater the force between the first sealing ring 5 and the second sealing ring 7 and the adjacent components in the cover plate assembly 100, and the stronger the sealing performance; the smaller the compression amount, the smaller the corresponding extrusion deformation, the smaller the force between the components in contact with the first sealing ring 5 and the second sealing ring 7 and the weaker the sealing performance. Preferably, the compression amount of the first sealing ring 5 and the second sealing ring 7 is controlled at 25%-30%. In this embodiment, when the cover plate assembly 100 is assembled, the compression amount of the first sealing ring 5 in the cover plate assembly 100 is controlled by limiting the height of the inner insulating part 2, and the compression amount of the second sealing ring 7 in the cover plate assembly 100 is controlled by limiting the depth of the first groove 4611 of the pole 4 and the depth of the second groove 631. The compression amount of the first sealing ring 5 and the second sealing ring 7 is controlled between 25% and 30%, thereby ensuring the sealing performance of the first sealing ring 5 and the second sealing ring 7, and ensuring that the first sealing ring 5 and the second sealing ring 7 are used within the designed elastic range, thereby improving the service life of the first sealing ring 5 and the second sealing ring 7.

[0054] Second embodiment

[0055] This embodiment discloses a cover plate assembly, which is different from the first embodiment in that, in this embodiment, the orthographic projections of the second through hole and the first through hole on one side surface of the cover plate coincide, that is, the first through hole and the second through hole in this embodiment have the same size and shape. The pole in this embodiment includes a first section, a second section, and a third section, but does not include a fourth section. The third section is directly inserted into the second through hole and connected to the inner lead plate.

[0056] Third embodiment

[0057] This embodiment discloses a battery, comprising the cover plate assembly in any one of the above embodiments.

[0058] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A cover plate assembly, comprising a cover plate, an inner insulating member and an inner lead plate arranged in sequence along the axial direction, characterized in that: It also includes a pole penetrating the cover plate, a first sealing ring sleeved between the pole and the inner insulating member, an outer insulating member sleeved between the pole and the cover plate, and a second sealing ring sleeved between the pole and the outer insulating member. The cover plate is provided with a first through hole penetrating along the thickness thereof, and the pole and the outer insulating member are penetrated in the first through hole.

2. The cover plate assembly according to claim 1, characterized in that: The pole comprises a first section, a second section, a third section and a fourth section which are sequentially connected along the axial direction; The cross-sectional width of the second section of the pole is greater than the cross-sectional width of the third section, so that a first stepped groove for fixing the first sealing ring is formed between the second section and the third section of the pole, and the first stepped groove has a first mounting surface and a second mounting surface connected to each other; The first sealing ring has a first abutting surface and a second abutting surface arranged opposite to each other along the axial direction, the first abutting surface is tightly fitted with the cover plate, the outer insulating member and the first mounting surface of the first stepped groove, and the second abutting surface is tightly fitted with the inner lead-out plate.

3. The cover plate assembly according to claim 2, characterized in that: The outer insulating member is sleeved between the first section and the second section of the pole, and includes a first cylinder sleeved outside the first section of the pole, a second cylinder sleeved outside the second section of the pole, and an annular connecting piece connecting the first cylinder and the second cylinder.

4. The cover plate assembly according to claim 3, characterized in that: The cross-sectional width of the first section of the pole is greater than the cross-sectional width of the second section, so that a second stepped groove is formed between the first section and the second section of the pole; The second stepped groove includes a first horizontal surface located in the first section; The second sealing ring is located between the first horizontal plane of the pole and the annular connecting piece of the outer insulating member.

5. The cover plate assembly according to claim 4, characterized in that: A first groove for accommodating the second sealing ring is provided on the first horizontal surface of the pole and / or a second groove for accommodating the second sealing ring is provided on the annular connecting plate of the outer insulating member, and the second sealing ring is clamped in the first groove and / or the second groove.

6. The cover plate assembly according to claim 5, characterized in that: When the first groove is provided on the pole and the second groove is provided on the outer insulating member, the depth of the first groove is h1, the depth of the second groove is h2, the thickness of the second sealing ring after compression is h3, and the thickness of the second sealing ring after compression h3 is the sum of the depth h1 of the first groove and the depth h2 of the second groove.

7. The cover plate assembly according to claim 2, characterized in that: A second through hole is provided in the middle of the inner lead-out plate and penetrates through the inner lead-out plate in its thickness direction. The fourth section of the pole is inserted into the second through hole and is welded and fixed to the inner lead-out plate.

8. The cover plate assembly according to claim 1, characterized in that: The thickness of the inner insulating member is a, and the thickness of the first sealing ring after compression is b. The thickness b of the first sealing ring after compression is the same as the thickness a of the inner insulating member.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The compression amounts of the first sealing ring and the second sealing ring are both 5%-45%.

10. A battery, characterized in that: A cover plate assembly comprising any one of claims 1-9.

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