Battery cover plate and battery

Abstract

The utility model provides a battery cover plate and battery, the battery cover plate comprises a cover body and a sealing element, the cover body is provided with a mounting groove, the groove bottom of the mounting groove is provided with a liquid injection hole, the liquid injection hole is arranged to penetrate through the cover body, the sealing element is arranged in the mounting groove and is used for sealing the liquid injection hole, one side of the sealing element deviating from the groove bottom is provided with a first groove, and the first groove is provided with a second groove. The first groove is provided with a first groove side wall which extends in the circumferential direction of the sealing part and is opposite to the side wall of the mounting groove, the first groove side wall and the side wall of the mounting groove are welded and fixed, the thickness T1 of the first groove side wall is larger than or equal to 0.5 cm and smaller than or equal to 0.8 cm, and therefore the design that the thickness of the first groove side wall ranges from 0.5 cm to 0.8 cm enables the first groove side wall to have enough elastic deformation capacity; due to the capacity, the side wall of the first groove can generate certain deformation, so that the stress generated in the welding process is counteracted. Stress is offset through elastic deformation, the problem that the sealing piece cracks due to stress concentration is effectively solved, and the sealing effect between the sealing piece and the cover body is good.

Description

Technical Field

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

[0002] Lithium batteries have the advantages of small size, high energy density, long service life, environmental protection, etc., and are widely used in industries such as automobiles, electronic products, and energy storage systems. However, in manufacturing, a seal is usually welded to the battery cover to seal the liquid injection hole. However, if the welding temperature is too high, it is easy to cause stress when the seal and the battery cover are heated and then cooled, resulting in cracks in the seal and the battery cover, affecting the sealing effect of the seal and the battery cover. Summary of the Utility Model

[0003] An embodiment of the utility model provides a battery cover plate and a battery, which can solve the problem that cracks may occur in the seal and the battery cover during the welding of the seal to the battery cover in the related art, resulting in poor sealing effect.

[0004] In a first aspect, an embodiment of the utility model provides a battery cover plate.

[0005] In one embodiment, there is a cover body, the cover body is provided with an installation groove, a liquid injection hole is provided at the bottom of the installation groove, and the liquid injection hole penetrates through the cover body;

[0006] A seal is installed in the installation groove for sealing the liquid injection hole. A first groove is provided on a side of the seal facing away from the bottom of the groove. The first groove has a first groove side wall extending along the circumferential direction of the seal and opposite to the side wall of the installation groove. The first groove side wall is welded and fixed to the side wall of the installation groove. The thickness of the first groove side wall is T1, where 0.5 cm ≤ T1 ≤ 0.8 cm.

[0007] In one embodiment, the first groove includes a plurality of sub-grooves, and the plurality of sub-grooves are arranged at intervals along the circumferential direction of the seal.

[0008] In one embodiment, the first groove has a first side facing away from the peripheral edge of the seal, and the first side is inclined in a direction away from the peripheral edge of the seal along a direction away from the bottom of the groove.

[0009] In one embodiment, it further includes a sealing column, and the sealing column is hermetically inserted into the liquid injection hole and partially protrudes from the bottom of the installation groove;

[0010] A second groove facing away from the bottom of the groove is provided on a side of the seal facing the bottom of the groove. The second groove corresponds to the liquid injection hole, and a part of the sealing column protruding from the bottom of the installation groove is located in the second groove.

[0011] In one embodiment, the second groove has a second side surface disposed adjacent to the periphery of the seal, and the second side surface is inclined in a direction toward the periphery of the seal along a direction toward the bottom of the groove.

[0012] In one embodiment, the second groove has a second groove side wall extending along the circumferential direction of the seal and disposed opposite to the side wall of the mounting groove, and the distance between the inner wall surface and the outer wall surface of the second groove side wall is T2, where 1.2 cm ≤ T2 ≤ 1.5 cm.

[0013] In one embodiment, the cover body is further provided with a third groove, and the third groove is disposed around the outside of the mounting groove.

[0014] In one embodiment, along the direction from the third groove to the mounting groove, the groove width of the third groove is W, where 0.8 cm ≤ W ≤ 1.2 cm.

[0015] In one embodiment, the distance between the third groove and the mounting groove is L, where 0.8 cm ≤ L ≤ 1.2 cm.

[0016] In one embodiment, the side wall of the mounting groove has a first welding surface facing the mounting groove, and the first welding surface is inclined in a direction away from the bottom of the groove and away from the seal; and / or,

[0017] The first groove side wall has a second welding surface disposed opposite to the side wall of the mounting groove, and the second welding surface is inclined in a direction away from the bottom of the groove and toward the side wall of the mounting groove.

[0018] In a second aspect, an embodiment of the present invention provides a battery.

[0019] In one embodiment, the battery includes the battery cover plate as described above.

[0020] The beneficial effects of the embodiments of the present invention:

[0021] In an embodiment of the present utility model, the seal is installed in the installation groove to seal the liquid injection hole. This design ensures the isolation between the inside and outside of the battery, preventing the leakage of electrolyte or other battery internal substances, thereby improving the safety and service life of the battery. The first side wall of the first groove is fixedly welded to the side wall of the installation groove. This welding method enhances the connection strength between the seal and the cover body, further improving the reliability of the seal. The thickness of the first side wall of the groove is between 0.5 cm and 0.8 cm, providing sufficient structural strength for the seal to effectively resist external impacts and pressures, maintaining the stability and integrity of the structure. Ensuring within this thickness range that the first side wall of the groove is not prone to deformation or damage during long-term use, thereby extending the service life of the battery cover plate. When the first side wall of the groove is heated and cooled at the welding joint to generate stress, its design with a thickness between 0.5 cm and 0.8 cm enables it to have sufficient elastic deformation ability. This ability allows the first side wall of the groove to undergo a certain amount of deformation, thereby offsetting the stress generated during the welding process. By offsetting the stress through elastic deformation, the problem of seal cracking caused by stress concentration is effectively solved. On the one hand, the sealing effect between the seal and the cover body is good, and on the other hand, the integrity and strength of the welded joint are ensured, improving the overall quality of the battery cover plate. Due to the sufficient structural strength and elastic deformation ability of the first side wall of the groove, it can maintain a tight fit with the seal during long-term use, thus ensuring that the sealing performance inside the battery is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic structural diagram of a battery cover plate (partial structure) provided by an embodiment of the present utility model;

[0024] Figure 2 is a schematic structural diagram of a battery cover plate with a seal column installed provided by another embodiment of the present utility model;

[0025] Figure 3 is a schematic structural diagram of a battery cover plate (partial structure) provided by another embodiment of the present utility model;

[0026] Figure 4 is a schematic structural diagram of a seal provided by an embodiment of the present utility model;

[0027] Figure 5 is Figure 4Schematic cross-sectional view of the seal shown;

[0028] Figure 6 Schematic structural view of the seal provided by another embodiment of the present utility model;

[0029] Figure 7 is Figure 6 Schematic cross-sectional view of the seal shown;

[0030] Figure 8 Schematic structural view of the cover body provided by another embodiment of the present utility model;

[0031] Figure 9 is Figure 8 Schematic cross-sectional view of the seal shown;

[0032] Figure 10 is Figure 9 Partial enlarged view at A in;

[0033] Explanation of reference numerals in the drawings:

[0034] 10. Battery cover plate;

[0035] 1. Cover body, 11. Installation groove, 112. First welding surface, 12. Liquid injection hole, 13. Third groove, 131. Third groove side wall;

[0036] 2. Seal, 21. First groove, 211. First groove side wall, 2112. Second welding surface, 212. Sub-groove, 2121. First side surface, 22. Second groove, 221. Second side surface, 222. Second groove side wall;

[0037] 3. Sealing column. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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 skilled in the art without making creative efforts belong to the scope of protection of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation terms such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the drawings; and "inner" and "outer" refer to the outline of the device.

[0039] Lithium batteries have the advantages of small size, high energy density, long service life, and environmental friendliness, and are widely used in industries such as automobiles, electronic products, and energy storage systems. However, in manufacturing, seals are usually welded to the battery cover to seal the liquid injection hole. However, if the welding temperature is too high, it is easy to cause stress when the seal and the battery cover are heated and then cooled, resulting in cracks in the seal and the battery cover, affecting the sealing effect of the seal and the battery cover.

[0040] In view of this, the present utility model proposes a battery cover plate, Figures 1 to 10 As shown in the structural schematic diagram of the embodiment of the battery cover plate provided by the present utility model, the battery cover plate provided by the present utility model can effectively solve the problem of seal cracking caused by stress concentration, resulting in a good sealing effect between the seal and the cover body; the following will describe the battery cover plate in detail with reference to the main drawings.

[0041] Refer to Figures 1 to 3 , Figure 1 As shown in the structural schematic diagram of the battery cover plate (partial structure) provided by an embodiment of the present utility model, Figure 2 As shown in the structural schematic diagram of the battery cover plate with a sealing column installed provided by another embodiment of the present utility model, Figure 3 As shown in the structural schematic diagram of the battery cover plate (partial structure) provided by another embodiment of the present utility model. The battery cover plate 10 includes a cover body 1 and a seal 2. The cover body 1 is provided with an installation groove 11. A liquid injection hole 12 is provided at the bottom of the installation groove 11. The liquid injection hole 12 penetrates through the cover body 1. The seal 2 is installed in the installation groove 11 to seal the liquid injection hole 12. A first groove 21 is provided on the side of the seal 2 facing away from the bottom of the groove. The first groove 21 has a first groove side wall 211 that extends circumferentially along the seal 2 and is disposed opposite to the side wall of the installation groove 11. The first groove side wall 211 is welded and fixed to the side wall of the installation groove 11. The thickness of the first groove side wall 211 is T1, where 0.5 cm ≤ T1 ≤ 0.8 cm.

[0042] In an embodiment of the present utility model, the seal 2 is installed in the installation groove 11 to seal the liquid injection hole 12. This design ensures the isolation between the inside and outside of the battery, preventing the leakage of electrolyte or other substances inside the battery, thereby improving the safety and service life of the battery. The first groove side wall 211 of the first groove 21 is fixedly welded to the side wall of the installation groove 11. This welding method enhances the connection strength between the seal 2 and the cover body 1, further improving the reliability of the seal. The thickness of the first groove side wall 211 is between 0.5 cm and 0.8 cm, providing sufficient structural strength for the seal 2 to effectively resist external impacts and pressures and maintain the stability and integrity of the structure. Within this thickness range, it is ensured that the first groove side wall 211 is not easily deformed or damaged during long-term use, thus extending the service life of the battery cover 10. When the first groove side wall 211 is heated and cooled at the welding joint to generate stress, its design with a thickness between 0.5 cm and 0.8 cm endows it with sufficient elastic deformation ability. This ability enables the first groove side wall 211 to undergo a certain amount of deformation, thereby offsetting the stress generated during the welding process. By offsetting the stress through elastic deformation, the problem of cracking of the seal 2 caused by stress concentration is effectively solved. On the one hand, it ensures a good sealing effect between the seal 2 and the cover body 1. On the other hand, it guarantees the integrity and strength of the welded joint, improving the overall quality of the battery cover 10. Due to the sufficient structural strength and elastic deformation ability of the first groove side wall 211, it can maintain a tight fit with the seal 2 during long-term use, thus ensuring that the sealing performance inside the battery is not affected.

[0043] It should be noted that the thickness of the first groove side wall 211 can be 0.5 cm, 0.55 cm, 0.58 cm, 0.6 cm, 0.63 cm, 0.65 cm, 0.68 cm, 0.69 cm, 0.7 cm, 0.72 cm, 0.74 cm, 0.76 cm, 0.78 cm, 0.79 cm, 0.8 cm, etc. Specifically, the thickness of the first groove side wall 211 can be selected according to needs, and the present application does not limit this.

[0044] In addition, when the thickness of the first groove side wall 211 is less than 0.5 cm, the first groove side wall 211 may not be able to withstand sufficient external impact or pressure, which increases the risk of deformation or damage to the battery cover plate 10 when subjected to external forces. During the welding process, stress will be generated when the first groove side wall 211 cools after being heated. When the thickness of the first groove side wall 211 is too small, its ability to resist welding stress will be weakened, making it easier to cause deformation or cracking of the welded joint. When the thickness is too small, its elastic deformation ability will be limited, and it cannot effectively relieve the welding stress, thus increasing the risk of cracking. The thickness of the first groove side wall 211 is directly related to the welding quality between it and the side wall of the installation groove 11. When the thickness is too small, the strength of the welded joint may be insufficient, resulting in a decline in the sealing performance. The sealing effect between the seal 2 and the cover body 1 becomes poor, which may cause safety problems such as electrolyte leakage.

[0045] When the thickness of the first groove side wall 211 is greater than 0.8 cm, the thicker first groove side wall 211 requires higher heat input and longer welding time during the welding process, which increases the welding difficulty and the requirements for process control. At the same time, the too thick first groove side wall 211 may also cause defects such as slag inclusion and lack of fusion at the welded joint, affecting the welding quality. During the welding process, due to the large heat capacity of the thicker first groove side wall 211, it is more likely to generate larger thermal deformation after being heated. If the welding process control is improper, it may cause deformation of the first groove side wall 211 or the entire battery cover plate 10, affecting the sealing effect and the appearance quality.

[0046] It should be noted that the cross-section of the first groove 21 can be annular, circular (refer to Figure 4 and Figure 5 ) or square, etc. The present application does not limit the specific shape of the first groove 21.

[0047] Refer to Figure 1 、 Figure 6 and Figure 7 , Figure 6 which is a schematic structural diagram of a seal provided by another embodiment of the present utility model, Figure 7 is Figure 6A cross-sectional schematic view of the shown seal. In one embodiment, the first groove 21 includes a plurality of sub-grooves 212, and the plurality of sub-grooves 212 are arranged at intervals along the circumferential direction of the seal 2. In this way, the connection part between two adjacent sub-grooves 212 is designed to form a structure similar to a reinforcing rib. When these "reinforcing ribs" are subjected to external forces, they can support each other and jointly resist deformation, thereby enhancing the structural stability of the seal 2. During the welding process, the side walls of the sub-grooves 212 of each sub-groove 212 will generate thermal stress due to uneven heating. After the welding is completed, the side walls of the sub-grooves 212 cool and shrink, and these thermal stresses will be converted into welding stresses. At this time, the design of the plurality of sub-grooves 212 enables the side walls of the sub-grooves 212 to have a certain elastic deformation space. When the welding stress acts on the seal 2, the side walls of the sub-grooves 212 can undergo a certain amount of elastic deformation, thereby absorbing and offsetting part of the welding stress. Since the plurality of sub-grooves 212 are arranged at intervals along the circumferential direction, when the side wall of a certain sub-groove 212 undergoes elastic deformation, the side walls of the surrounding sub-grooves 212 will also be affected to a certain extent. This mutual influence helps to further disperse the welding stress to the entire seal 2 and gradually release it. This can not only reduce the cracking risk caused by stress concentration, but also improve the quality and reliability of the welded joint.

[0048] It should be noted that by reasonably designing parameters such as the number, size, shape, and spacing of the sub-grooves 212, the structural design of the seal 2 can be further optimized. For example, appropriately increasing the number of sub-grooves 212 can reduce the stress area and stress level on the side wall of each sub-groove 212; reasonably setting the spacing of the sub-grooves 212 can ensure that the side walls of the sub-grooves 212 will not interfere with each other or generate excessive deformation when undergoing elastic deformation. These optimization measures all help to improve the strength and sealing performance of the seal 2. This application does not make any limitations in this regard.

[0049] Referring to Figure 1 and Figure 7In one embodiment, the first groove 21 has a first side surface 2121 disposed away from the periphery of the seal 2, and the first side surface 2121 is disposed in an inclined direction away from the groove bottom and away from the periphery of the seal 2, so that the first side surface 2121 forms an inclined surface. When subjected to external impact or pressure, this inclined surface can guide the stress to gradually disperse along the direction of the inclined surface. Compared with the vertical side surface, the inclined side surface provides a longer stress transmission path, so that the stress can be dispersed and absorbed in a larger area. The design of the inclined side surface also promotes the redistribution of stress. When subjected to impact or pressure, the stress distribution inside the seal 2 will change. The inclined side surface can guide the stress to be transmitted to other parts of the seal 2 instead of concentrating it at one point or one line. This redistribution of stress helps to reduce local stress concentration and improve the overall bearing capacity of the seal 2. According to the principle of material mechanics, a material will undergo elastic deformation when subjected to external force. The design of the inclined side surface enables the seal 2 to absorb and disperse stress by utilizing the elastic deformation of the material when subjected to impact or pressure. This elastic deformation is reversible, and when the external force disappears, the seal 2 can return to its original shape and size. From the perspective of structural mechanics, the design of the inclined side surface enhances the structural stability of the seal 2. It enables the seal 2 to maintain structural integrity and stability when subjected to external impact or pressure, and is not easily damaged or failed. In addition, compared with the processing of the vertical side surface, the design of the inclined first side surface 2121 may allow the processing tool to be processed along a smoother path, and can avoid interference between the processing tool and other parts of the seal 2, making the processing process of the seal 2 simpler and more efficient.

[0050] Reference Figure 1 and Figure 2 In one embodiment, the battery cover 10 further includes a sealing column 3, which is sealed and inserted into the injection hole 12 and partially protrudes from the bottom of the mounting groove 11. In this way, the sealing column 3 is directly inserted into the injection hole 12 to form a direct sealing connection. This design can effectively prevent the internal medium of the battery (such as electrolyte) from leaking through the injection hole 12, thereby improving the safety of the battery. Since the sealing column 3 partially protrudes from the bottom of the mounting groove 11, the disassembly and assembly operation of the sealing column 3 is simple. Figure 1 and Figure 7, on the side of the seal 2 facing the bottom of the groove, a second groove 22 away from the bottom of the groove is provided. The second groove 22 is arranged corresponding to the liquid injection hole 12. The part of the sealing column 3 protruding from the bottom of the installation groove 11 is located in the second groove 22. In this way, the second groove 22 realizes the avoidance of the sealing column 3, facilitating the installation of the sealing column 3. In addition, when the sealing column 3 abuts against the bottom wall of the second groove 22, the second sealing is formed between the sealing column 3 and the bottom wall of the second groove 22. The sealing between the sealing column 3 and the liquid injection hole 12 and the sealing abutment between the sealing column 3 and the bottom of the second groove 22. This double-sealing mechanism greatly improves the reliability of the seal and effectively prevents the leakage of the internal medium of the battery. In addition, the protruding part of the sealing column 3 is located in the second groove 22, which can realize the positioning and installation of the seal 2.

[0051] Refer to Figure 1 and Figure 7 , in an embodiment, the second groove 22 has a second side surface 221 arranged adjacent to the periphery of the seal 2. The second side surface 221 is inclined in the direction of the periphery of the seal 2 along the direction towards the bottom of the groove. In this way, the second side surface 221 forms an inclined surface. When subjected to external impact or pressure, this inclined surface can guide the stress to gradually disperse along the direction of the inclined surface. Compared with the vertical side surface, the inclined side surface provides a longer stress transmission path, enabling the stress to be dispersed and absorbed in a larger area. The design of the inclined side surface also promotes the redistribution of stress. When subjected to impact or pressure, the stress distribution inside the seal 2 will change. The inclined side surface can guide the stress to other parts of the seal 2 instead of concentrating at a single point or a single line. This redistribution of stress helps to reduce local stress concentration and improve the overall load-bearing capacity of the seal 2. According to the principle of material mechanics, materials will undergo elastic deformation when subjected to external forces. The design of the inclined side surface enables the seal 2 to utilize the elastic deformation of the material to absorb and disperse stress when subjected to impact or pressure. This elastic deformation is reversible. When the external force disappears, the seal 2 can return to its original shape and size. From the perspective of structural mechanics, the design of the inclined side surface enhances the structural stability of the seal 2. It enables the seal 2 to maintain the integrity and stability of the structure and is not prone to damage or failure when subjected to external impact or pressure. In addition, compared with the processing of the vertical side surface, the design of the inclined second side surface 221 may enable the processing tool to move along a smoother path for processing and can avoid interference between the processing tool and other parts of the seal 2, making the processing process of the seal 2 simpler and more efficient.

[0052] Refer to Figure 7, in one embodiment, the second groove 22 has a second groove sidewall 222 that extends circumferentially along the seal 2 and is disposed opposite to the sidewall of the mounting groove 11. The distance between the inner wall surface and the outer wall surface of the second groove sidewall 222 is T2, where 1.2 cm ≤ T2 ≤ 1.5 cm. Thus, during the operation of the battery, the pressure generated by the internal chemical reaction and the changes in the external environment may both have a certain impact on the battery cover 10. The distance range between the inner wall surface and the outer wall surface of the second groove sidewall 222 improves the bearing capacity of the second groove sidewall 222, enabling the second groove sidewall 222 to better withstand mechanical effects such as the internal pressure of the battery, external impacts, and vibrations, and maintaining the structural stability of the battery cover 10. Additionally, when the seal 2 and the cover are welded, due to heat conduction, a part of the welding heat will also be transferred to the second groove sidewall 222. When the second groove sidewall 222 is heated and then cooled to generate stress, the design of the distance between its inner wall surface and outer wall surface being between 1.2 cm and 1.5 cm endows it with a certain elastic deformation ability. This elastic deformation ability allows the second groove sidewall 222 to undergo a small deformation, thereby offsetting the stress generated during the welding process. By offsetting the stress through elastic deformation, the problem of the seal 2 cracking due to stress concentration is effectively solved, resulting in a good sealing effect between the seal 2 and the cover body 1.

[0053] It should be noted that the distance between the inner wall surface and the outer wall surface of the second groove sidewall 222 can be 1.2 cm, 1.25 cm, 1.28 cm, 1.29 cm, 1.3 cm, 1.32 cm, 1.34 cm, 1.35 cm, 1.37 cm, 1.38 cm, 1.41 cm, 1.42 cm, 1.43 cm, 1.45 cm, 1.48 cm, 1.49 cm, or 1.5 cm, etc. Specifically, the distance between the inner wall surface and the outer wall surface of the second groove sidewall 222 can be selected as needed, and this application does not make any limitations in this regard.

[0054] In addition, when the distance between the inner wall surface and the outer wall surface of the second groove sidewall 222 is less than 1.2 cm, it may cause the second groove sidewall 222 to be unable to withstand sufficient external impacts or pressures, which increases the risk of deformation or damage to the battery cover 10 when subjected to external forces. When the distance between the inner wall surface and the outer wall surface of the second groove sidewall 222 is greater than 1.5 cm, the distance between the inner wall surface and the outer wall surface is relatively large, resulting in a weak elastic deformation ability of the second groove sidewall 222. When the second groove sidewall 222 is heated and then cooled to generate stress, it cannot offset the stress generated during the welding process through deformation. This leads to the problem of the seal 2 cracking due to stress concentration, resulting in a poor sealing effect between the seal 2 and the cover body 1.

[0055] Refer to Figures 8 to 10 , Figure 8 is a schematic structural diagram of a cover body provided by another embodiment of the present utility model.Figure 9 is Figure 8 a schematic cross-sectional view of the seal shown Figure 10 is Figure 9 a partial enlarged schematic view at position A in

[0056] In one embodiment, the cover body 1 is further provided with a third groove 13. The third groove 13 is disposed around the outside of the installation groove 11. Due to local high-temperature heating, an uneven temperature distribution will be generated on the cover body 1, which will in turn lead to the generation of welding stress. These stresses tend to concentrate in the welding area of the cover body 1 and its vicinity, forming a stress concentration phenomenon. The setting of the third groove 13 is equivalent to providing a "buffer zone" around the stress concentration area. When welding stress is generated, part of the stress can be transmitted and dispersed through the wall surface of the third groove 13. When the welding stress exceeds a certain limit, the third groove side wall 131 of the third groove 13 will undergo elastic deformation, thereby absorbing and releasing part of the stress, thus reducing the degree and range of welding deformation, and thus improving the stability and reliability of the sealing performance of the battery cover 10.

[0057] It should be noted that the groove width of the third groove 13 can be: 0.8 cm, 0.81 cm, 0.83 cm, 0.85 cm, 0.87 cm, 0.89 cm, 0.9 cm, 0.92 cm, 0.95 cm, 0.98 cm, 0.99 cm, 1 cm, 1.05 cm, 1.08 cm, 1.09 cm, 1.1 cm, 1.13 cm, 1.15 cm, 1.16 cm, 1.19 cm or 1.2 cm, etc. Specifically, the groove width of the third groove 13 can be selected as needed, and this application does not limit this.

[0058] In addition, when the groove width of the third groove 13 is greater than 1.2 cm, the overall structural strength of the cover body 1 will be affected. When the groove width of the third groove 13 is less than 0.8 cm, the effective dispersion of stress may be restricted.

[0059] In one embodiment, the spacing between the third groove 13 and the mounting groove 11 is L, wherein 0.8 cm ≤ L ≤ 1.2 cm. Thus, the spacing between the third groove 13 and the mounting groove 11 is in the range of 0.8 cm to 1.2 cm, which helps to optimize the distribution of stress and avoid excessive concentration of stress in local areas, thereby reducing potential damage to the structure of the cover body 1. The spacing design in the range of 0.8 cm to 1.2 cm can enhance the overall stability of the cover body 1, so that it can better maintain its shape and performance when facing external loads or environmental changes. During the welding process, the cover body 1 may be affected by welding stress. The spacing in the range of 0.8 cm to 1.2 cm allows the third groove 13 to undergo a certain degree of elastic deformation after welding, thereby effectively releasing welding stress and reducing welding deformation.

[0060] It should be noted that when the distance between the third groove 13 and the mounting groove 11 is less than 0.8 cm, the third groove side wall 131 of the third groove 13 adjacent to the mounting groove 11 may not be able to withstand sufficient external impact or pressure, which increases the risk of deformation or damage to the battery cover 10 when subjected to external force. When the distance between the third groove 13 and the mounting groove 11 is greater than 1.2 cm, the elastic deformation capacity of the third groove side wall 131 is relatively weak, so that when the third groove side wall 131 is heated and cooled to generate stress, it is unable to offset the stress generated during the welding process through deformation. This causes the cover 1 to crack due to stress concentration, resulting in poor sealing between the seal 2 and the cover 1.

[0061] Reference Figure 10 In one embodiment, the side wall of the mounting groove 11 has a first welding surface 112 disposed toward the mounting groove 11, and the first welding surface 112 is inclined in a direction away from the groove bottom and away from the sealing member 2. In this way, the inclined first welding surface 112 facilitates the flow of the molten pool and the discharge of gas during welding, and reduces the possibility of defects such as pores and slag inclusions during welding. This improves the quality of the welded joint and enhances the overall strength of the structure. Due to the inclined design of the first welding surface 112, the heat transfer during welding is more uniform, and the welding speed may be increased, thereby improving work efficiency. The inclined design of the first welding surface 112 helps to optimize the distribution of stress after welding and reduce the local stress concentration caused by welding. This helps to extend the service life of the cover body 1 and improve its stability. The inclined design of the first welding surface 112 may help to form a tighter sealing structure during welding and reduce the risk of leakage. During the assembly process, the inclined first welding surface 112 may make the fit between the sealing member 2 and the cover body 1 smoother, reducing the difficulty and time of assembly.

[0062] Reference Figure 5 and Figure 7, in one embodiment, the side wall 211 of the first groove has a second welding surface 2112 disposed opposite to the side wall of the mounting groove 11. The second welding surface 2112 is inclined in the direction of the side wall of the mounting groove 11 along the direction away from the groove bottom. In this way, the inclined second welding surface 2112 helps the flow of the molten pool during the welding process, enabling the molten pool to cover the welding surface more evenly. At the same time, it is beneficial to the discharge of the gas generated during the welding process, reducing the occurrence of welding defects such as pores and slag inclusions, thereby improving the quality of the welded joint. The design of the inclined second welding surface 2112 helps to optimize the stress distribution after welding and reduce the phenomenon of local stress concentration. This helps to reduce the risk of welding deformation and cracks and improve the stability of the welded structure. The inclined design of the second welding surface 2112 may help to form a tighter sealing structure during the welding process and reduce the risk of leakage. During the assembly process, the inclined second welding surface 2112 may make the fit between the seal 2 and the cover 1 smoother, reducing the assembly difficulty and time.

[0063] An embodiment of the present invention also provides a battery. The battery includes the battery cover plate 10 as described above. For the specific structure of the battery cover plate 10, refer to the above embodiment. Since the battery adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0064] The above has introduced the embodiments of the present invention in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A battery cover plate, characterized in that, Comprising: A cover body, an installation groove is provided on the cover body, a liquid injection hole is provided at the bottom of the installation groove, and the liquid injection hole penetrates through the cover body; A seal, installed in the installation groove for sealing the liquid injection hole, a first groove is provided on one side of the seal facing away from the bottom of the groove, the first groove has a first groove side wall extending along the circumferential direction of the seal and opposite to the side wall of the installation groove, and the first groove side wall is fixedly welded to the side wall of the installation groove. The thickness of the first groove side wall is T1, where 0.5 cm ≤ T1 ≤ 0.8 cm.

2. The battery cover plate according to claim 1, wherein, The first groove includes a plurality of sub-grooves, and the plurality of sub-grooves are arranged at intervals along the circumferential direction of the seal.

3. The battery cover plate according to claim 1, wherein, The first groove has a first side surface away from the peripheral edge of the seal, and the first side surface is inclined in a direction away from the peripheral edge of the seal along a direction away from the bottom of the groove.

4. The battery cover plate according to any one of claims 1 to 3, characterized in that, It further includes a sealing column, the sealing column is sealingly inserted into the liquid injection hole and partially protrudes from the bottom of the installation groove; A second groove facing away from the bottom of the groove is provided on one side of the seal facing the bottom of the groove, the second groove corresponds to the liquid injection hole, and the part of the sealing column protruding from the bottom of the installation groove is located in the second groove.

5. The battery cover plate according to claim 4, characterized in that, The second groove has a second side surface adjacent to the peripheral edge of the seal, and the second side surface is inclined in a direction towards the peripheral edge of the seal along a direction towards the bottom of the groove.

6. The battery cover plate according to claim 4, wherein, The second groove has a second groove side wall extending along the circumferential direction of the seal and opposite to the side wall of the installation groove, and the distance between the inner wall surface and the outer wall surface of the second groove side wall is T2, where 1.2 cm ≤ T2 ≤ 1.5 cm.

7. The battery cover plate according to any one of claims 1 to 3, characterized in that, The cover body is further provided with a third groove, and the third groove surrounds the outside of the installation groove.

8. The battery cover plate according to claim 7, wherein, Along the direction from the third groove to the installation groove, the groove width of the third groove is W, where 0.8 cm ≤ W ≤ 1.2 cm; and / or The distance between the third groove and the installation groove is L, where 0.8 cm ≤ L ≤ 1.2 cm.

9. The battery cover plate according to any one of claims 1 to 3, characterized in that, The side wall of the installation groove has a first welding surface facing the installation groove, and the first welding surface is inclined in a direction away from the bottom of the groove and away from the seal; and / or, The first groove side wall has a second welding surface opposite to the side wall of the installation groove, and the second welding surface is inclined in a direction towards the side wall of the installation groove along a direction away from the bottom of the groove.

10. A battery, characterized in that, Including the battery cover plate according to any one of claims 1 to 9.

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