Sealing nail for power battery, shell assembly and power battery

Abstract

The utility model discloses a sealing nail for a power battery, a shell assembly and the power battery. The sealing nail comprises a base plate part, a sinking groove is formed in the middle of the upper surface of the base plate part, laser code engraving is conducted on the groove bottom plane of the sinking groove, an annular peripheral area is formed in the position, on the outer side of the sinking groove, of the base plate part, the outer side of the annular peripheral area protrudes downwards to form an annular boss, and a containing groove is correspondingly formed in the inner side of the annular boss. The containing groove is configured to contain the upper end of the plastic nail. The sealing nail provided by the embodiment of the utility model can solve the technical problems that the power battery cannot be traced and production information cannot be correspondingly inquired due to the fact that the laser carved code is easy to damage and cannot be scanned. In addition, the containing groove used for containing the upper end of the rubber nail is formed in the bottom of the sealing nail, so that the sealing nail can avoid the upper end of the rubber nail.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field especially relates to a kind of sealing nail, shell assembly and power battery for power battery. BACKGROUND

[0002] At present, lithium ion / sodium ion power battery gradually becomes new energy industry mainstream product due to high energy density, capacity consistency is good, can support large rate charge-discharge and other advantages.But high-capacity cylindrical lithium ion / sodium ion etc. power battery has certain dangerous nature, to facilitate tracing the production information of power battery, product needs to be laser engraved code.However, the current product has the following common problems:

[0003] 1, common laser engraving code is set on the top cover of cylindrical power battery, and when module is welded to the same end of positive and negative plate, it is easy to wear or weld to the code, which leads to the problem that the power battery cannot be traced and the production information cannot be correspondingly inquired.

[0004] 2, some manufacturers directly set laser engraving code at the bottom or shell body position of cylindrical power battery, due to the softness of aluminum shell material, knock, wear and tear during the process, which will damage the code, resulting in the problem that the power battery cannot be traced and the production information cannot be correspondingly inquired. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of sealing nail, shell assembly and power battery for power battery, can solve the technical problem that laser engraving code is easily damaged and leads to the problem that the power battery cannot be traced and the production information cannot be correspondingly inquired.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a kind of sealing nail for power battery, the sealing nail includes base plate part, the middle part of the upper surface of the base plate part is formed with sunken groove, the groove bottom plane of the sunken groove is laser engraved, the outer side of the sunken groove of the base plate part forms annular peripheral area, the outer side of the annular peripheral area protrudes annular boss downward, the inner side of the annular boss is correspondingly formed with accommodating groove, the accommodating groove is configured to accommodate the upper end of glue nail.

[0007] Optionally, the middle part of the base plate part is integrally sunken to form sunken area, the upper side of the sunken area forms the sunken groove, the lower surface of the sunken area is lower than the lower surface of the annular peripheral area, the sunken area and the annular peripheral area are connected by annular side wall, when the annular peripheral area and the edge of liquid injection groove are laser welded, the annular side wall can be elastically deformed.

[0008] Optionally, the annular peripheral region is located between the lower surface inside the annular boss and the lower side surface of the annular side wall to form an annular groove with a U-shaped or V-shaped cross section.

[0009] Optionally, the outer side surface of the annular peripheral region and the outer side surface of the annular boss jointly form an inclined surface that is inclined inward from top to bottom.

[0010] Optionally, the upper end of the outer side surface of the annular peripheral region forms a vertical surface, and the vertical surface and the inclined surface are connected in an up-down manner.

[0011] To achieve the above-mentioned purpose, the utility model provides a kind of shell assembly for power battery, the shell assembly includes shell, glue nail and sealing nail, the upper surface of the shell is formed with liquid injection groove, the middle part of the liquid injection groove is formed with liquid injection hole that penetrates the shell;The glue nail is inserted at the liquid injection hole, and the upper end of the glue nail is protruded to the liquid injection groove;The sealing nail is fixedly arranged in the liquid injection groove, including base plate part, the middle part of the upper surface of the base plate part is formed with sunken groove, the groove bottom plane of the sunken groove is laser coded, annular peripheral region is formed to the outside of the sunken groove of the base plate part, the outer side of the annular peripheral region is protruded with annular boss, the annular boss is supported on the outer edge of the liquid injection groove, the inner side of the annular boss is correspondingly formed with accommodating groove, and the upper end of the glue nail is accommodated in the accommodating groove.

[0012] Optionally, the middle part of the base plate part is integrally sunken to form sunken region, the upper side of the sunken region forms the sunken groove, the lower surface of the sunken region is lower than the lower surface of the annular peripheral region, the sunken region and the annular peripheral region are connected by annular side wall, and the annular side wall can be elastically deformed when the annular peripheral region and the edge of liquid injection groove are laser welded to present thermal expansion and cold shrinkage.

[0013] Optionally, the outer side surface of the annular peripheral region and the outer side surface of the annular boss jointly form an inclined surface that is inclined inward from top to bottom, and the side wall of the liquid injection groove is inclined inward from top to bottom and is adapted to the inclined surface;The upper end of the outer side surface of the annular peripheral region forms a vertical surface, and the vertical surface and the inclined surface are connected in an up-down manner.

[0014] Optionally, the bottom wall edge of the liquid injection groove is upwardly protruded with annular step, and the annular boss is supported on the annular step.

[0015] To achieve the above-mentioned purpose, the utility model provides a kind of power battery, including the shell assembly for power battery as described above.

[0016] In this embodiment of the invention, laser marking is performed on the bottom plane of the recessed groove of the sealing pin, which largely avoids the situation where the laser marking is worn down during the assembly / transfer / use of the power battery, making it difficult to scan. Compared with placing the laser marking on the top cover, there is no risk of wear or welding to the marking when the positive and negative electrodes are welded to the same end. Compared with placing the laser marking on the aluminum shell, there is no risk of impact deformation or wear. Therefore, the sealing pin of this embodiment of the invention can solve the technical problem that the laser marking is easily damaged, making it impossible to scan, thus preventing the power battery from being traced and unable to query production information. In addition, the bottom of the sealing pin of this invention forms a receiving groove to accommodate the upper end of the rubber nail, allowing the sealing pin to avoid obstructing the upper end of the rubber nail. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the sealing nail according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the sealing nail according to an embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional structural schematic diagram of the sealing nail from another perspective of an embodiment of this utility model.

[0020] Figure 4 This is a top view of the sealing nail according to an embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional structural diagram of the power battery according to an embodiment of the present invention.

[0022] Figure 6 yes Figure 5 Enlarged view of part A in the middle. Detailed Implementation

[0023] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] Currently, laser marking on power batteries is typically located either on the top cover or on the aluminum casing. When placed on the top cover, the markings are easily worn or damaged during the welding of the modules to the same positive and negative terminals, rendering them unscannable. When placed on the aluminum casing, the relatively soft material makes the markings susceptible to damage from bumps and abrasions during handling, also preventing scanning. Therefore, both the top cover and the aluminum casing are prone to damaging the markings, leading to unscannable markings and making it impossible to trace the power battery or query production information.

[0026] Furthermore, with the exploration of through-welding technology, it is necessary to reserve a welding area, which places increasingly larger demands on the size of the sealing nails. The increased size of the sealing nails makes it possible to laser-encode their surface. Based on this, this utility model breaks with convention and proposes a technical concept of setting laser-encoded markings on the sealing nails.

[0027] Example 1

[0028] Please see Figures 1 to 6 This utility model discloses a sealing nail 10 for a power battery. The sealing nail 10 includes a base plate portion 11, a recessed groove 12 is formed in the middle of the upper surface of the base plate portion 11, a laser-etched code 121 is formed on the bottom plane of the recessed groove 12, an annular peripheral region 13 is formed on the outer side of the recessed groove 12 on the base plate portion 11, an annular boss 14 protrudes downward from the outer side of the annular peripheral region 13, and a receiving groove 15 is formed on the inner side of the annular boss 14 (i.e., the receiving groove 15 is formed by the annular boss 14), and the receiving groove 15 is configured to receive the upper end of the adhesive nail 20.

[0029] In this embodiment of the invention, laser marking is performed on the bottom plane of the recessed groove 12 of the sealing nail 10, which can largely avoid the situation where the laser marking 121 is worn and difficult to scan during the assembly / transfer / use of the power battery. Compared with setting the laser marking on the top cover, there is no situation where the marking is easily worn or welded to when the positive and negative terminals are welded out at the same end. Compared with setting the laser marking on the aluminum shell, there is no situation where it is easily bumped, deformed, or worn. It can be seen that the sealing nail 10 of this embodiment of the invention can solve the technical problem that the laser marking 121 is easily damaged and cannot be scanned, making it impossible to trace the power battery and query the corresponding production information. In addition, the bottom of the sealing nail 10 of this invention forms a receiving groove 15 for accommodating the upper end of the adhesive nail 20, so that the sealing nail 10 can also avoid the upper end of the adhesive nail 20.

[0030] Specifically, the middle portion of the substrate 11 is sunken to form a sunken region 16, and a sunken groove 12 is formed on the upper side of the sunken region 16. The lower surface of the sunken region 16 is lower than the lower surface of the annular peripheral region 13, and the sunken region 16 and the annular peripheral region 13 are connected by an annular sidewall 17. When the edges of the annular peripheral region 13 and the liquid injection groove 311 are laser welded and thermal expansion and contraction occur, the annular sidewall 17 can elastically deform, thereby avoiding problems such as cracking of the sealing nail 10.

[0031] More specifically, the annular peripheral region 13 forms an annular groove 18 with a U-shaped or V-shaped cross-section between the lower surface of the annular boss 14 and the lower surface of the annular sidewall 17.

[0032] Specifically, the outer surface of the annular peripheral region 13 and the outer surface of the annular boss 14 together form an inclined surface 191 that slopes inward from top to bottom. The sidewall of the injection groove 311 slopes inward from top to bottom and is adapted to the inclined surface 191.

[0033] More specifically, a vertical surface 192 is formed at the upper end of the outer surface of the annular peripheral region 13, and the vertical surface 192 and the inclined surface 191 are connected vertically. By setting the vertical surface 192, the weld material can be increased during laser seam welding, thereby improving the welding reliability.

[0034] Specifically, the sealing nail 10 can be made of aluminum or steel, and can be formed by one-piece stamping, cold heading or cold extrusion.

[0035] Example 2

[0036] Please see Figures 1 to 6 This utility model discloses a housing assembly for a power battery. The housing assembly includes a housing 30, a glue pin 20, and a sealing pin 10. A liquid injection groove 311 is formed on the upper surface of the housing 30, and a liquid injection hole 312 is formed in the middle of the liquid injection groove 311, penetrating the housing 30. The glue pin 20 is inserted into the liquid injection hole 312, and the upper end of the glue pin 20 protrudes into the liquid injection groove 311. The sealing pin 10 is fixedly disposed in the liquid injection groove 311 and includes a base plate portion 11. A recessed groove 12 (depth H preferably 0.1mm to 0.4mm) is formed in the middle of the upper surface of the base plate portion 11. A laser marking 121 is formed on the bottom plane of the recessed groove 12. An annular peripheral region 13 is formed on the outer side of the recessed groove 12. An annular boss 14 protrudes downward from the outer side of the annular peripheral region 13. The annular boss 14 is supported on the outer edge of the liquid injection groove 311. A receiving groove 15 is formed on the inner side of the annular boss 14, and the receiving groove 15 receives the upper end of the glue pin 20.

[0037] In the example shown in the attached diagram, the housing 30 is the outer casing 30 of the power battery, which is used to fit over the outer side of the core 40. The housing 30 includes a side wall 32 and a bottom 31, where the upper surface of the housing 30 refers to the upper surface (outer surface) of the bottom 31. Of course, the housing 30 is not limited to an outer casing 30; it can also be a cover for the power battery, in which case the upper surface of the housing 30 is the upper surface (outer surface) of the cover.

[0038] In this embodiment of the invention, laser marking is performed on the bottom plane of the recessed groove 12 of the sealing nail 10, which can largely avoid the situation where the laser marking 121 is worn and difficult to scan during the assembly / transfer / use of the power battery. Compared with setting the laser marking on the top cover, there is no situation where the marking is easily worn or welded to when the positive and negative terminals are welded out at the same end. Compared with setting the laser marking on the aluminum shell, there is no situation where it is easily bumped, deformed, or worn. It can be seen that the sealing nail 10 of this embodiment of the invention can solve the technical problem that the laser marking 121 is easily damaged and cannot be scanned, making it impossible to trace the power battery and query the corresponding production information. In addition, the bottom of the sealing nail 10 of this invention forms a receiving groove 15 for accommodating the upper end of the adhesive nail 20, so that the sealing nail 10 can also avoid the upper end of the adhesive nail 20.

[0039] Specifically, the middle portion of the substrate 11 is sunken to form a sunken region 16, and a sunken groove 12 is formed on the upper side of the sunken region 16. The lower surface of the sunken region 16 is lower than the lower surface of the annular peripheral region 13, and the sunken region 16 and the annular peripheral region 13 are connected by an annular sidewall 17. When the edges of the annular peripheral region 13 and the liquid injection groove 311 are laser welded and thermal expansion and contraction occur, the annular sidewall 17 can elastically deform, thereby avoiding problems such as cracking of the sealing nail 10.

[0040] More specifically, the annular peripheral region 13 forms an annular groove 18 with a U-shaped or V-shaped cross-section between the lower surface of the annular boss 14 and the lower surface of the annular sidewall.

[0041] Specifically, the outer surface of the annular peripheral region 13 and the outer surface of the annular boss 14 together form an inclined surface 191 that slopes inward from top to bottom, and the sidewall of the injection groove 311 slopes inward from top to bottom and is adapted to the inclined surface 191.

[0042] More specifically, a vertical surface 192 is formed at the upper end of the outer surface of the annular peripheral region 13, and the vertical surface 192 and the inclined surface 191 are connected vertically. By setting the vertical surface 192, the weld material can be increased during laser seam welding, thereby improving the welding reliability.

[0043] Specifically, the bottom wall edge of the injection groove 311 is provided with an annular step 313 protruding upward, and the annular boss 14 is supported on the annular step 313.

[0044] Specifically, the sealing nail 10 can be made of aluminum or steel, and can be formed by one-piece stamping, cold heading or cold extrusion.

[0045] Example 3

[0046] Please see Figures 1 to 6 This utility model discloses a power battery, including the housing assembly as described in Embodiment 2.

[0047] Specifically, the power battery also includes a core 40 and a current collector 50. In the example shown in the attached figure, the housing 30 is sleeved on the outside of the core 40, and the current collector 50 is welded between the bottom 31 of the housing 30 and the tab at one end of the core 40.

[0048] To facilitate understanding of this utility model, the optional assembly process of the power battery in the accompanying drawings is briefly described below:

[0049] After the welding of the collector plate 50 and the core 40 is completed, the core 40 is installed into the housing 30, with the collector plate 50 facing the bottom of the housing 31.

[0050] Next, the shell bottom 31 and the manifold 50 are welded together by laser penetration welding.

[0051] Next, liquid injection / formation is performed, and after the liquid injection / formation is completed, a rubber pin 20 is inserted into the liquid injection hole 312.

[0052] Next, the sealing nail 10 is fitted into the injection groove 311 and laser welded for sealing / fixing, wherein the receiving groove 15 at the bottom of the sealing nail 10 accommodates the glue nail 20 protruding into the upper end of the injection groove 311.

[0053] Next, laser markings 121 are formed on the bottom plane of the recessed groove 12.

[0054] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A sealing pin for a power battery, characterized in that, The sealing nail includes a base plate portion, a recessed groove is formed in the middle of the upper surface of the base plate portion, the bottom plane of the recessed groove is laser-etched, an annular peripheral area is formed on the outer side of the recessed groove on the base plate portion, an annular boss protrudes downward from the outer side of the annular peripheral area, and a receiving groove is formed on the inner side of the annular boss, the receiving groove being configured to receive the upper end of the adhesive nail.

2. The sealing pin for a power battery according to claim 1, characterized in that, The central part of the substrate is sunken to form a sunken area, and a sunken groove is formed on the upper side of the sunken area. The lower surface of the sunken area is lower than the lower surface of the annular peripheral area. The sunken area and the annular peripheral area are connected by an annular sidewall. When the edges of the annular peripheral area and the liquid injection groove are laser welded and thermal expansion and contraction occur, the annular sidewall can elastically deform.

3. The sealing pin for a power battery according to claim 2, characterized in that, The annular peripheral region is located between the lower surface of the inner side of the annular boss and the lower surface of the annular sidewall, forming an annular groove with a U-shaped or V-shaped cross-section.

4. The sealing pin for a power battery according to claim 1, characterized in that, The outer surface of the annular peripheral region and the outer surface of the annular boss together form an inclined surface that slopes inward from top to bottom.

5. The sealing pin for a power battery according to claim 4, characterized in that, The upper end of the outer side of the annular peripheral region forms a vertical surface, and the vertical surface and the inclined surface are connected vertically.

6. A housing assembly for a power battery, characterized in that, The housing assembly includes a housing, a rubber stud, and a sealing stud. A liquid injection groove is formed on the upper surface of the housing, and a liquid injection hole penetrating the housing is formed in the center of the liquid injection groove. The rubber stud is inserted into the liquid injection hole, and its upper end protrudes into the liquid injection groove. The sealing stud is fixedly disposed in the liquid injection groove and includes a base plate portion. A recessed groove is formed in the center of the upper surface of the base plate portion. The bottom plane of the recessed groove is laser-etched. An annular peripheral region is formed on the outer side of the base plate portion outside the recessed groove. An annular boss protrudes downward from the outer side of the annular peripheral region. The annular boss supports the outer edge of the liquid injection groove, and a corresponding receiving groove is formed on the inner side of the annular boss. The receiving groove receives the upper end of the rubber stud.

7. The housing assembly for a power battery according to claim 6, characterized in that, The central part of the substrate is sunken to form a sunken area, and a sunken groove is formed on the upper side of the sunken area. The lower surface of the sunken area is lower than the lower surface of the annular peripheral area. The sunken area and the annular peripheral area are connected by an annular sidewall. When the edges of the annular peripheral area and the liquid injection groove are laser welded and thermal expansion and contraction occur, the annular sidewall can elastically deform.

8. The housing assembly for a power battery according to claim 6, characterized in that, The outer side of the annular peripheral region and the outer side of the annular boss together form an inclined surface that slopes inward from top to bottom. The sidewall of the injection groove slopes inward from top to bottom and is adapted to the inclined surface. The upper end of the outer side of the annular peripheral region forms a vertical surface, and the vertical surface and the inclined surface are connected vertically.

9. The housing assembly for a power battery according to claim 6, characterized in that, The bottom wall edge of the injection groove is provided with an annular step that protrudes upward, and the annular boss is supported on the annular step.

10. A power battery, characterized in that, Includes the housing assembly for a power battery as described in any one of claims 6 to 9.

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