Battery cover plate assembly and pressure relief sealing nail thereof

Abstract

The utility model discloses a battery cover plate assembly and a pressure relief sealing nail thereof. The pressure relief sealing nail comprises a sealing nail main body, an anti-explosion hole formed in the sealing nail main body, and an anti-explosion valve connected with the sealing nail main body and used for sealing the anti-explosion hole. The sealing nail body is provided with a separation concave ring groove which extends around the center line of the anti-explosion hole and downwards penetrates through the lower end face of the sealing nail body, the separation concave ring groove enables the lower end of the sealing nail body to be divided into a lower inner end and a lower outer ring end, and the lower outer ring end further downwards protrudes out of the lower inner end. The end part of the lower outer ring is also downwards protruded out of the lower inner end part, so that the pressure relief sealing nail disclosed by the utility model is more easily and flatly matched with the battery cover plate when being assembled on the battery cover plate; besides, by means of the separation concave ring groove, when the pressure relief sealing nail is subjected to high-temperature thermal expansion and cold contraction during laser welding fixation, buffering is achieved through deformation of the separation concave ring groove, the effect is better, and impact / influence of high-temperature heat transfer on the anti-explosion valve is more effectively blocked.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a square and round wound battery core. Background Art

[0002] With the continuous development of economy and the continuous progress of society, people's production and life are provided with extremely rich material consumer goods, and batteries are one of the many material consumer goods.

[0003] At present, lithium-ion / nano-ion batteries (such as cylindrical batteries) have gradually become mainstream products in the new energy industry due to their advantages such as high energy density, good capacity consistency, and support for high-rate charge and discharge. More and more manufacturers continue to pursue the simplification of cylindrical battery top cover structures to reduce costs and increase energy density. However, in the process of simplifying the cylindrical battery top cover structure, there are the following common problems:

[0004] (1) An explosion-proof valve is preset on the top cover of the cylindrical battery. Therefore, during the battery assembly process, the explosion-proof valve is easily damaged or contaminated by the electrolyte, resulting in the battery being scrapped. For protection, an additional film is required, which increases the battery manufacturing cost.

[0005] (2) An explosion-proof valve is directly set on the sealing aluminum nail, instead of pre-setting the explosion-proof valve on the surface of the cylindrical battery top cover. However, when the aluminum nail and the battery top cover are laser welded and sealed, better laser welding process control and a larger aluminum nail size are required to avoid the impact / influence of high temperature thermal expansion and contraction on the explosion-proof valve.

[0006] However, in the existing aluminum nails, due to unreasonable design, the aluminum nails cannot fit smoothly in the injection hole assembled on the battery top cover; at the same time, when the aluminum nails are laser welded to the battery top cover, the impact / influence of high-temperature thermal expansion and contraction on the explosion-proof valve cannot be effectively avoided.

[0007] Therefore, a battery cover assembly and a pressure relief sealing nail thereof are provided to overcome one or more of the above-mentioned defects. Utility Model Content

[0008] One purpose of the utility model is to provide a pressure relief sealing nail, which is easier to fit smoothly with the pool cover during assembly and more effectively blocks the impact / influence of high-temperature heat transfer on the explosion-proof valve.

[0009] Another object of the utility model is to provide a battery cover assembly, which is easier to fit smoothly with the battery cover during assembly and more effectively blocks the impact / influence of high-temperature heat transfer on the explosion-proof valve.

[0010] To achieve the above purpose, the pressure relief sealing nail of the utility model is arranged on the battery cover plate, comprising a sealing nail body, an explosion-proof hole opened on the sealing nail body, and an explosion-proof valve connected to the sealing nail body and closing the explosion-proof hole. The sealing nail body is provided with a separating concave annular groove extending around the center line of the explosion-proof hole and penetrating downwardly through the lower end surface of the sealing nail body, and the separating concave annular groove separates the lower end of the sealing nail body into a lower inner end and a lower outer ring end, and the lower outer ring end also protrudes downwardly from the lower inner end.

[0011] Compared with the prior art, since the lower outer ring end and the lower inner end are formed by separating the lower end of the sealing nail body by a separating concave ring groove extending around the center line of the explosion-proof hole, and the lower outer ring end also protrudes downward from the lower inner end, the pressure relief sealing nail of the utility model is easier to fit smoothly with the battery cover when assembled on the battery cover, and when the pressure relief sealing nail of the utility model is laser welded and fixed with high temperature and thermal expansion and contraction, the separating concave ring groove is used to buffer the deformation, so the effect is better and the impact / influence of high temperature heat transfer on the explosion-proof valve is more effectively blocked.

[0012] Preferably, the explosion-proof valve is placed in the lower end of the explosion-proof hole, and the explosion-proof valve is flush with the lower inner end portion.

[0013] Preferably, the center line of the explosion-proof hole coincides with the upper and lower center lines of the sealing nail body, and the sealing nail body is provided with a chamfered structure for enlarging the upper end opening of the explosion-proof hole.

[0014] Preferably, a thinning groove is provided on the explosion-proof valve, and the thinning groove penetrates the upper surface of the explosion-proof valve upwards, or the thinning groove penetrates the lower surface of the explosion-proof valve downwards.

[0015] Preferably, the thinning grooves are arranged in a cross, X or Y shape, the center line of the explosion-proof hole passes through the intersection of the thinning grooves, and the cross-section of the thinning grooves is in a U or V shape.

[0016] Preferably, the cross section of the separating concave annular groove is in an inverted "U" shape or a "V" shape.

[0017] Preferably, the upper and lower dimensions of the separating concave annular groove are greater than 0.45 mm and less than two-thirds of the upper and lower dimensions of the sealing nail body.

[0018] Preferably, the sealing nail body and the explosion-proof valve are formed into an integrated structure by integral stamping.

[0019] Preferably, the side surface of the sealing nail body is an inclined surface inclined relative to the upper and lower center lines of the sealing nail body, and the inclined surface makes the sealing nail body expand from bottom to top. The angle between the side surface of the sealing nail body and the upper and lower center lines ranges from 1 to 45 degrees.

[0020] To achieve the above-mentioned purpose, the battery cover assembly of the utility model includes a battery cover and the aforementioned pressure relief sealing nail. The battery cover is provided with a liquid injection hole that passes through the battery cover from top to bottom, and the liquid injection hole includes an upper liquid injection hole and a lower liquid injection hole that are connected from top to bottom, and the aperture of the upper liquid injection hole is larger than the aperture of the lower liquid injection hole. The sealing nail body is placed in the upper liquid injection hole so that the end of the lower outer ring abuts against the bottom wall of the upper liquid injection hole, and the sealing nail body is also sealed and welded to the side wall of the upper liquid injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional view of a battery cover assembly according to one embodiment of the utility model.

[0022] Figure 2 yes Figure 1 A three-dimensional view of the pressure relief sealing pin when it is separated from the battery cover.

[0023] Figure 3 yes Figure 1 A plan view viewed from the direction opposite to that indicated by arrow A.

[0024] Figure 4 is along Figure 3 Internal view cut along the midline BB.

[0025] Figure 5 yes Figure 1 A three-dimensional view of the pressure relief sealing nail in the battery cover assembly is shown.

[0026] Figure 6 yes Figure 5 A stereogram from another angle.

[0027] Figure 7 yes Figure 5 A plan view viewed from the direction opposite to that indicated by arrow A.

[0028] Figure 8 is along Figure 7 Internal view of the mid-DD line section.

[0029] Fig. 9 Yes Figure 7 The pressure relief sealing pin is shown in a plan view after undergoing a deformation.

[0030] Fig.10 Yes Figure 7 A plan view of the pressure relief sealing pin shown undergoing another deformation.

[0031] Fig.11 Yes Figure 8 A plan view of a pressure relief sealing pin undergoing yet another deformation is shown. DETAILED DESCRIPTION

[0032] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements.

[0033] See also Figures 1 to 3 The battery cover assembly 100 of one embodiment of the utility model is applied to a cylindrical battery. Obviously, according to actual needs, it can also be Figures 1 to 3 The battery cover assembly 100 shown is applied to a square battery. When applied to a cylindrical battery, Figures 1 to 3 The battery cover plate 20 in the battery cover plate assembly 100 is shown as being circular. When applied to a square battery, the battery cover plate 20 in the battery cover plate assembly 100 needs to be square.

[0034] Recombination Figure 4 The battery cover assembly 100 of the present invention includes a pressure relief sealing nail 10 and the aforementioned battery cover 20, and the battery cover 20 is provided with a liquid injection hole 21 that passes through the battery cover 20 from top to bottom. The liquid injection hole 21 includes an upper liquid injection hole 21a and a lower liquid injection hole 21b that are connected from top to bottom. The aperture of the upper liquid injection hole 21a is larger than the aperture of the lower liquid injection hole 21b, so that the upper liquid injection hole 21a has a hole bottom wall 212 that is penetrated upward by the lower liquid injection hole 21b; optionally, Figure 4 As an example, the center lines of the upper injection hole 21a and the lower injection hole 21b coincide with each other, and the center line can be referred to as the reference numeral C, so as to facilitate the manufacturing and processing of the injection hole 21 at the battery cover 20; Obviously, according to actual needs, the center lines of the upper injection hole 21a and the lower injection hole 21b can also be arranged at a preset interval, so it is not necessary to Figure 4 Limits shown.

[0035] Recombination Figures 5 to 8 The pressure relief sealing nail 10 comprises a sealing nail body 11, an explosion-proof hole 12 provided on the sealing nail body 11, and an explosion-proof valve 13 connected to the sealing nail body 11 and closing the explosion-proof hole 12. The sealing nail body 11 is provided with a separating concave annular groove 14 extending around the center line of the explosion-proof hole 12 (refer to the reference numeral C) and penetrating downwardly through the lower end surface 111 of the sealing nail body 11. The separating concave annular groove 14 separates the lower end 11a of the sealing nail body 11 into a lower inner end 11a1 and a lower outer ring end 11a2. The lower outer ring end 11a2 also protrudes downwardly from the lower inner end 11a1, so that there is a spacing difference H between the lower outer ring end 11a2 and the lower inner end 11a1. The state is shown in FIG. Figure 4 and Figure 8 The sealing nail body 11 is placed in the upper injection hole 21a so that the lower outer ring end 11a2 abuts against the bottom wall 212 of the upper injection hole 21a. Figure 4 As shown; the sealing nail body 11 is also sealed and welded with the side wall 211 of the upper injection hole 21a, so as to achieve the purpose of sealing the injection hole 21 of the battery cover plate 20 by the pressure relief sealing nail 10. Specifically, Figure 4 As an example, the upper end of the side surface 113 of the sealing nail body 11 is sealed and welded to the side wall 211 of the upper liquid injection hole 21a to form a welding structure 30, which more effectively improves the welding stability and sealing reliability between the pressure relief sealing nail 10 and the battery cover 20. Figure 8 and Fig.11 In the embodiment, the upper and lower dimensions T2 of the separating concave annular groove 14 are greater than 0.45 mm and less than two-thirds of the upper and lower dimensions T1 of the sealing nail body 11, so as to effectively increase the opening dimensions of the separating concave annular groove 14 while ensuring that the sealing nail body 11 has sufficient strength; optionally, Figure 8 and Fig.11 As an example, the cross section of the separating concave annular groove 14 is in an inverted "V" shape. Obviously, it can also be made into an inverted "U" shape. More specifically, as follows:

[0036] like Figure 4 and Figure 8 As shown, the explosion-proof valve 13 is placed in the lower end of the explosion-proof hole 12. This design more effectively avoids the impact / influence of high-temperature heat transfer on the explosion-proof valve 13 when the upper end of the side 113 of the sealing nail body 11 is sealed and welded with the hole side wall 211 of the upper liquid injection hole 21a. Optionally, Figure 4 and Figure 8 As an example, the explosion-proof valve 13 is flush with the lower inner end 11a1 to simplify the manufacturing process of the pressure relief sealing nail 10; in addition, the sealing nail body 11 and the explosion-proof valve 13 are formed into an integrated structure through integrated stamping, which can further simplify the manufacturing process of the pressure relief sealing nail 10 and effectively ensure the bonding strength between the sealing nail body 11 and the explosion-proof valve 13. Figure 4 and Figure 8As an example, the center line of the explosion-proof hole 12 coincides with the upper and lower center lines of the sealing nail body 11, and the coincidence line is indicated by the label C, that is, the label C can represent the center line of the explosion-proof hole 12, and can also represent the upper and lower center lines of the sealing nail body 11; and the sealing nail body 11 is provided with a chamfered structure 112 for expanding the upper end opening 121 of the explosion-proof hole 12; therefore, with the help of the chamfered structure 112, it is convenient for the pressure relief sealing nail 10 to be formed by one-piece stamping, and with the help of the center line of the explosion-proof hole 12 coinciding with the upper and lower center lines of the sealing nail body 11, the explosion-proof hole 12 is arranged at the center of the sealing nail body 11, thereby effectively controlling the volume of the sealing nail body 11. More specifically, in Figure 5 and Figure 7 As an example, the explosion-proof hole 12 is a circular hole to facilitate the production of the explosion-proof hole 12 on the sealing nail body 11; correspondingly, the explosion-proof valve 13 is a circular valve, that is, the shape of the explosion-proof hole 12 matches the shape of the explosion-proof valve 13.

[0037] like Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, the side surface 113 of the sealing nail body 11 is an inclined surface inclined relative to the upper and lower center lines C of the sealing nail body 11. The inclined surface makes the sealing nail body 11 expand from bottom to top. This design facilitates the sealing nail body 11 to be inserted into the upper liquid injection hole 21a of the battery cover plate 20 during the process of installing the pressure relief sealing nail 10 on the battery cover plate 20. Specifically, Figure 8 As an example, the angle α between the side 113 of the sealing nail body 11 and the upper and lower center lines C ranges from 1 to 45 degrees. For example, the angle α is 1 degree, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees or 45 degrees.

[0038] like Figure 5 , Figure 7 and Figure 8 As shown, the explosion-proof valve 13 is provided with a thinning groove 131, which penetrates upwardly through the upper surface 132 of the explosion-proof valve 13. Obviously, in other embodiments, the thinning groove 131 can also penetrate downwardly through the lower surface 133 of the explosion-proof valve 13; with the help of the thinning groove 131, the explosion-proof valve 13 becomes thinner at the location where the thinning groove 131 is located, so that during the pressure relief process, the explosion-proof valve 13 breaks at the location where the thinning groove 131 is located, and will not fall off from the explosion-proof hole 12 after breaking. Specifically, Figure 5 and Figure 7 In the embodiment, as an example, the thinning groove 131 is in the shape of a cross; obviously, according to actual needs, the thinning groove 131 may also be in the shape of Fig. 9 The "X" arrangement shown, or Fig.10The center line C of the explosion-proof hole 12 passes through the intersection 1311 of the thinning groove 131 to ensure the reliability of the pressure relief of the explosion-proof valve 13; in addition, the cross section of the thinning groove 1311 is "V" shaped, and the state is shown Figure 8 Obviously, according to actual needs, the cross section of the thinning groove 1311 can also be Fig.11 The "U" shape shown.

[0039] Compared with the prior art, since the lower outer ring end 11a2 and the lower inner end 11a1 are formed by the separating concave annular groove 14 extending around the center line C of the explosion-proof hole 12 to separate the lower end 11a of the sealing nail body 11, and the lower outer ring end 11a2 also protrudes downward from the lower inner end 11a1, the pressure relief sealing nail 10 is easier to fit smoothly with the battery cover 20 when assembled on the battery cover 20, and when the pressure relief sealing nail 10 is laser welded and fixed and high-temperature thermal expansion and contraction occurs, the separating concave annular groove 14 is used to buffer the deformation, so the effect is better and the impact / influence of high-temperature heat transfer on the explosion-proof valve 13 is more effectively blocked.

[0040] It should be noted that the direction indicated by the arrow A in the accompanying drawings is the direction from bottom to top of the sealing nail body 11. In addition, the material of the pressure relief sealing nail 10 is aluminum. Obviously, it can also be other materials known in the art that are suitable for manufacturing the pressure relief sealing nail 10. In addition, the shape of the sealing nail body 11 is determined by the shape of the injection hole 21. When the injection hole 21 is a circular hole, the outer contour of the cross section of the sealing nail body 11 is correspondingly circular. Although the accompanying drawings show that the explosion-proof valve 13 is located at the lower end of the explosion-proof hole 12, this cannot be used to restrict the layout position of the explosion-proof valve 13. Since the separating concave annular groove 14 penetrates downwardly through the lower end face 111 of the sealing nail body 11, the portion of the lower end face 111 located at the lower outer ring end 11a2 is preferably a horizontal plane structure, and the state is shown in FIG. Figure 4 , Figure 8 and Fig.11 shown.

[0041] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A pressure relief sealing nail, arranged on a battery cover, comprising a sealing nail body, an explosion-proof hole opened on the sealing nail body, and an explosion-proof valve connected to the sealing nail body and closing the explosion-proof hole, characterized in that: The sealing nail body is provided with a separating concave annular groove extending around the center line of the explosion-proof hole and penetrating downwardly through the lower end surface of the sealing nail body. The separating concave annular groove separates the lower end of the sealing nail body into a lower inner end and a lower outer ring end, and the lower outer ring end also protrudes downwardly from the lower inner end.

2. The pressure relief sealing nail according to claim 1, characterized in that: The explosion-proof valve is placed in the lower end of the explosion-proof hole, and the explosion-proof valve is flush with the lower inner end.

3. The pressure relief sealing nail according to claim 1, characterized in that: The center line of the explosion-proof hole coincides with the upper and lower center lines of the sealing nail body, and the sealing nail body is provided with a chamfered structure for enlarging the upper end opening of the explosion-proof hole.

4. The pressure relief sealing nail according to claim 1, characterized in that: The explosion-proof valve is provided with a thinning groove, and the thinning groove penetrates the upper surface of the explosion-proof valve upwards, or the thinning groove penetrates the lower surface of the explosion-proof valve downwards.

5. The pressure relief sealing nail according to claim 4, characterized in that: The thinning grooves are arranged in a "cross" shape, an "X" shape or a "Y" shape, the center line of the explosion-proof hole passes through the intersection of the thinning grooves, and the cross-section of the thinning grooves is in a "U" shape or a "V" shape.

6. The pressure relief sealing nail according to claim 1, characterized in that: The cross section of the separating concave annular groove is in an inverted "U" shape or a "V" shape.

7. The pressure relief sealing nail according to claim 1, characterized in that: The upper and lower dimensions of the separating concave annular groove are greater than 0.45 mm and less than two-thirds of the upper and lower dimensions of the sealing nail body.

8. The pressure relief sealing nail according to claim 1, characterized in that: The sealing nail body and the explosion-proof valve are formed into an integrated structure through integrated stamping.

9. The pressure relief sealing nail according to claim 8, characterized in that: The side surface of the sealing nail body is an inclined surface inclined relative to the upper and lower center lines of the sealing nail body. The inclined surface makes the sealing nail body expand from bottom to top. The angle between the side surface of the sealing nail body and the upper and lower center lines ranges from 1 to 45 degrees.

10. A battery cover assembly, comprising a battery cover, wherein the battery cover is provided with a liquid injection hole which passes through the battery cover from top to bottom, wherein the liquid injection hole comprises an upper liquid injection hole and a lower liquid injection hole which are connected from top to bottom, wherein the aperture of the upper liquid injection hole is larger than the aperture of the lower liquid injection hole, and wherein: The battery cover assembly also includes a pressure relief sealing nail according to any one of claims 1 to 9, wherein the sealing nail body is placed in the upper liquid injection hole so that the lower outer ring end abuts against the bottom wall of the upper liquid injection hole, and the sealing nail body is also seal-welded to the side wall of the upper liquid injection hole.

Images